View.java revision 12df3cf156885a421beccfa6b6e20fd1a188847a
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.Interpolator; 28import android.graphics.LinearGradient; 29import android.graphics.Matrix; 30import android.graphics.Paint; 31import android.graphics.PixelFormat; 32import android.graphics.Point; 33import android.graphics.PorterDuff; 34import android.graphics.PorterDuffXfermode; 35import android.graphics.Rect; 36import android.graphics.RectF; 37import android.graphics.Region; 38import android.graphics.Shader; 39import android.graphics.drawable.ColorDrawable; 40import android.graphics.drawable.Drawable; 41import android.os.Handler; 42import android.os.IBinder; 43import android.os.Message; 44import android.os.Parcel; 45import android.os.Parcelable; 46import android.os.RemoteException; 47import android.os.SystemClock; 48import android.text.TextUtils; 49import android.util.AttributeSet; 50import android.util.FloatProperty; 51import android.util.LocaleUtil; 52import android.util.Log; 53import android.util.Pool; 54import android.util.Poolable; 55import android.util.PoolableManager; 56import android.util.Pools; 57import android.util.Property; 58import android.util.SparseArray; 59import android.util.TypedValue; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.accessibility.AccessibilityEvent; 62import android.view.accessibility.AccessibilityEventSource; 63import android.view.accessibility.AccessibilityManager; 64import android.view.accessibility.AccessibilityNodeInfo; 65import android.view.accessibility.AccessibilityNodeProvider; 66import android.view.animation.Animation; 67import android.view.animation.AnimationUtils; 68import android.view.inputmethod.EditorInfo; 69import android.view.inputmethod.InputConnection; 70import android.view.inputmethod.InputMethodManager; 71import android.widget.ScrollBarDrawable; 72 73import static android.os.Build.VERSION_CODES.*; 74 75import com.android.internal.R; 76import com.android.internal.util.Predicate; 77import com.android.internal.view.menu.MenuBuilder; 78 79import java.lang.ref.WeakReference; 80import java.lang.reflect.InvocationTargetException; 81import java.lang.reflect.Method; 82import java.util.ArrayList; 83import java.util.Arrays; 84import java.util.Locale; 85import java.util.concurrent.CopyOnWriteArrayList; 86 87/** 88 * <p> 89 * This class represents the basic building block for user interface components. A View 90 * occupies a rectangular area on the screen and is responsible for drawing and 91 * event handling. View is the base class for <em>widgets</em>, which are 92 * used to create interactive UI components (buttons, text fields, etc.). The 93 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 94 * are invisible containers that hold other Views (or other ViewGroups) and define 95 * their layout properties. 96 * </p> 97 * 98 * <div class="special reference"> 99 * <h3>Developer Guides</h3> 100 * <p>For information about using this class to develop your application's user interface, 101 * read the <a href="{@docRoot}guide/topics/ui/index.html">User Interface</a> developer guide. 102 * </div> 103 * 104 * <a name="Using"></a> 105 * <h3>Using Views</h3> 106 * <p> 107 * All of the views in a window are arranged in a single tree. You can add views 108 * either from code or by specifying a tree of views in one or more XML layout 109 * files. There are many specialized subclasses of views that act as controls or 110 * are capable of displaying text, images, or other content. 111 * </p> 112 * <p> 113 * Once you have created a tree of views, there are typically a few types of 114 * common operations you may wish to perform: 115 * <ul> 116 * <li><strong>Set properties:</strong> for example setting the text of a 117 * {@link android.widget.TextView}. The available properties and the methods 118 * that set them will vary among the different subclasses of views. Note that 119 * properties that are known at build time can be set in the XML layout 120 * files.</li> 121 * <li><strong>Set focus:</strong> The framework will handled moving focus in 122 * response to user input. To force focus to a specific view, call 123 * {@link #requestFocus}.</li> 124 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 125 * that will be notified when something interesting happens to the view. For 126 * example, all views will let you set a listener to be notified when the view 127 * gains or loses focus. You can register such a listener using 128 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 129 * Other view subclasses offer more specialized listeners. For example, a Button 130 * exposes a listener to notify clients when the button is clicked.</li> 131 * <li><strong>Set visibility:</strong> You can hide or show views using 132 * {@link #setVisibility(int)}.</li> 133 * </ul> 134 * </p> 135 * <p><em> 136 * Note: The Android framework is responsible for measuring, laying out and 137 * drawing views. You should not call methods that perform these actions on 138 * views yourself unless you are actually implementing a 139 * {@link android.view.ViewGroup}. 140 * </em></p> 141 * 142 * <a name="Lifecycle"></a> 143 * <h3>Implementing a Custom View</h3> 144 * 145 * <p> 146 * To implement a custom view, you will usually begin by providing overrides for 147 * some of the standard methods that the framework calls on all views. You do 148 * not need to override all of these methods. In fact, you can start by just 149 * overriding {@link #onDraw(android.graphics.Canvas)}. 150 * <table border="2" width="85%" align="center" cellpadding="5"> 151 * <thead> 152 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 153 * </thead> 154 * 155 * <tbody> 156 * <tr> 157 * <td rowspan="2">Creation</td> 158 * <td>Constructors</td> 159 * <td>There is a form of the constructor that are called when the view 160 * is created from code and a form that is called when the view is 161 * inflated from a layout file. The second form should parse and apply 162 * any attributes defined in the layout file. 163 * </td> 164 * </tr> 165 * <tr> 166 * <td><code>{@link #onFinishInflate()}</code></td> 167 * <td>Called after a view and all of its children has been inflated 168 * from XML.</td> 169 * </tr> 170 * 171 * <tr> 172 * <td rowspan="3">Layout</td> 173 * <td><code>{@link #onMeasure(int, int)}</code></td> 174 * <td>Called to determine the size requirements for this view and all 175 * of its children. 176 * </td> 177 * </tr> 178 * <tr> 179 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 180 * <td>Called when this view should assign a size and position to all 181 * of its children. 182 * </td> 183 * </tr> 184 * <tr> 185 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 186 * <td>Called when the size of this view has changed. 187 * </td> 188 * </tr> 189 * 190 * <tr> 191 * <td>Drawing</td> 192 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 193 * <td>Called when the view should render its content. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td rowspan="4">Event processing</td> 199 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 200 * <td>Called when a new key event occurs. 201 * </td> 202 * </tr> 203 * <tr> 204 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 205 * <td>Called when a key up event occurs. 206 * </td> 207 * </tr> 208 * <tr> 209 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 210 * <td>Called when a trackball motion event occurs. 211 * </td> 212 * </tr> 213 * <tr> 214 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 215 * <td>Called when a touch screen motion event occurs. 216 * </td> 217 * </tr> 218 * 219 * <tr> 220 * <td rowspan="2">Focus</td> 221 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 222 * <td>Called when the view gains or loses focus. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 228 * <td>Called when the window containing the view gains or loses focus. 229 * </td> 230 * </tr> 231 * 232 * <tr> 233 * <td rowspan="3">Attaching</td> 234 * <td><code>{@link #onAttachedToWindow()}</code></td> 235 * <td>Called when the view is attached to a window. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td><code>{@link #onDetachedFromWindow}</code></td> 241 * <td>Called when the view is detached from its window. 242 * </td> 243 * </tr> 244 * 245 * <tr> 246 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 247 * <td>Called when the visibility of the window containing the view 248 * has changed. 249 * </td> 250 * </tr> 251 * </tbody> 252 * 253 * </table> 254 * </p> 255 * 256 * <a name="IDs"></a> 257 * <h3>IDs</h3> 258 * Views may have an integer id associated with them. These ids are typically 259 * assigned in the layout XML files, and are used to find specific views within 260 * the view tree. A common pattern is to: 261 * <ul> 262 * <li>Define a Button in the layout file and assign it a unique ID. 263 * <pre> 264 * <Button 265 * android:id="@+id/my_button" 266 * android:layout_width="wrap_content" 267 * android:layout_height="wrap_content" 268 * android:text="@string/my_button_text"/> 269 * </pre></li> 270 * <li>From the onCreate method of an Activity, find the Button 271 * <pre class="prettyprint"> 272 * Button myButton = (Button) findViewById(R.id.my_button); 273 * </pre></li> 274 * </ul> 275 * <p> 276 * View IDs need not be unique throughout the tree, but it is good practice to 277 * ensure that they are at least unique within the part of the tree you are 278 * searching. 279 * </p> 280 * 281 * <a name="Position"></a> 282 * <h3>Position</h3> 283 * <p> 284 * The geometry of a view is that of a rectangle. A view has a location, 285 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 286 * two dimensions, expressed as a width and a height. The unit for location 287 * and dimensions is the pixel. 288 * </p> 289 * 290 * <p> 291 * It is possible to retrieve the location of a view by invoking the methods 292 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 293 * coordinate of the rectangle representing the view. The latter returns the 294 * top, or Y, coordinate of the rectangle representing the view. These methods 295 * both return the location of the view relative to its parent. For instance, 296 * when getLeft() returns 20, that means the view is located 20 pixels to the 297 * right of the left edge of its direct parent. 298 * </p> 299 * 300 * <p> 301 * In addition, several convenience methods are offered to avoid unnecessary 302 * computations, namely {@link #getRight()} and {@link #getBottom()}. 303 * These methods return the coordinates of the right and bottom edges of the 304 * rectangle representing the view. For instance, calling {@link #getRight()} 305 * is similar to the following computation: <code>getLeft() + getWidth()</code> 306 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 307 * </p> 308 * 309 * <a name="SizePaddingMargins"></a> 310 * <h3>Size, padding and margins</h3> 311 * <p> 312 * The size of a view is expressed with a width and a height. A view actually 313 * possess two pairs of width and height values. 314 * </p> 315 * 316 * <p> 317 * The first pair is known as <em>measured width</em> and 318 * <em>measured height</em>. These dimensions define how big a view wants to be 319 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 320 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 321 * and {@link #getMeasuredHeight()}. 322 * </p> 323 * 324 * <p> 325 * The second pair is simply known as <em>width</em> and <em>height</em>, or 326 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 327 * dimensions define the actual size of the view on screen, at drawing time and 328 * after layout. These values may, but do not have to, be different from the 329 * measured width and height. The width and height can be obtained by calling 330 * {@link #getWidth()} and {@link #getHeight()}. 331 * </p> 332 * 333 * <p> 334 * To measure its dimensions, a view takes into account its padding. The padding 335 * is expressed in pixels for the left, top, right and bottom parts of the view. 336 * Padding can be used to offset the content of the view by a specific amount of 337 * pixels. For instance, a left padding of 2 will push the view's content by 338 * 2 pixels to the right of the left edge. Padding can be set using the 339 * {@link #setPadding(int, int, int, int)} method and queried by calling 340 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 341 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}. 342 * </p> 343 * 344 * <p> 345 * Even though a view can define a padding, it does not provide any support for 346 * margins. However, view groups provide such a support. Refer to 347 * {@link android.view.ViewGroup} and 348 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 349 * </p> 350 * 351 * <a name="Layout"></a> 352 * <h3>Layout</h3> 353 * <p> 354 * Layout is a two pass process: a measure pass and a layout pass. The measuring 355 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 356 * of the view tree. Each view pushes dimension specifications down the tree 357 * during the recursion. At the end of the measure pass, every view has stored 358 * its measurements. The second pass happens in 359 * {@link #layout(int,int,int,int)} and is also top-down. During 360 * this pass each parent is responsible for positioning all of its children 361 * using the sizes computed in the measure pass. 362 * </p> 363 * 364 * <p> 365 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 366 * {@link #getMeasuredHeight()} values must be set, along with those for all of 367 * that view's descendants. A view's measured width and measured height values 368 * must respect the constraints imposed by the view's parents. This guarantees 369 * that at the end of the measure pass, all parents accept all of their 370 * children's measurements. A parent view may call measure() more than once on 371 * its children. For example, the parent may measure each child once with 372 * unspecified dimensions to find out how big they want to be, then call 373 * measure() on them again with actual numbers if the sum of all the children's 374 * unconstrained sizes is too big or too small. 375 * </p> 376 * 377 * <p> 378 * The measure pass uses two classes to communicate dimensions. The 379 * {@link MeasureSpec} class is used by views to tell their parents how they 380 * want to be measured and positioned. The base LayoutParams class just 381 * describes how big the view wants to be for both width and height. For each 382 * dimension, it can specify one of: 383 * <ul> 384 * <li> an exact number 385 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 386 * (minus padding) 387 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 388 * enclose its content (plus padding). 389 * </ul> 390 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 391 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 392 * an X and Y value. 393 * </p> 394 * 395 * <p> 396 * MeasureSpecs are used to push requirements down the tree from parent to 397 * child. A MeasureSpec can be in one of three modes: 398 * <ul> 399 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 400 * of a child view. For example, a LinearLayout may call measure() on its child 401 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 402 * tall the child view wants to be given a width of 240 pixels. 403 * <li>EXACTLY: This is used by the parent to impose an exact size on the 404 * child. The child must use this size, and guarantee that all of its 405 * descendants will fit within this size. 406 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 407 * child. The child must gurantee that it and all of its descendants will fit 408 * within this size. 409 * </ul> 410 * </p> 411 * 412 * <p> 413 * To intiate a layout, call {@link #requestLayout}. This method is typically 414 * called by a view on itself when it believes that is can no longer fit within 415 * its current bounds. 416 * </p> 417 * 418 * <a name="Drawing"></a> 419 * <h3>Drawing</h3> 420 * <p> 421 * Drawing is handled by walking the tree and rendering each view that 422 * intersects the invalid region. Because the tree is traversed in-order, 423 * this means that parents will draw before (i.e., behind) their children, with 424 * siblings drawn in the order they appear in the tree. 425 * If you set a background drawable for a View, then the View will draw it for you 426 * before calling back to its <code>onDraw()</code> method. 427 * </p> 428 * 429 * <p> 430 * Note that the framework will not draw views that are not in the invalid region. 431 * </p> 432 * 433 * <p> 434 * To force a view to draw, call {@link #invalidate()}. 435 * </p> 436 * 437 * <a name="EventHandlingThreading"></a> 438 * <h3>Event Handling and Threading</h3> 439 * <p> 440 * The basic cycle of a view is as follows: 441 * <ol> 442 * <li>An event comes in and is dispatched to the appropriate view. The view 443 * handles the event and notifies any listeners.</li> 444 * <li>If in the course of processing the event, the view's bounds may need 445 * to be changed, the view will call {@link #requestLayout()}.</li> 446 * <li>Similarly, if in the course of processing the event the view's appearance 447 * may need to be changed, the view will call {@link #invalidate()}.</li> 448 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 449 * the framework will take care of measuring, laying out, and drawing the tree 450 * as appropriate.</li> 451 * </ol> 452 * </p> 453 * 454 * <p><em>Note: The entire view tree is single threaded. You must always be on 455 * the UI thread when calling any method on any view.</em> 456 * If you are doing work on other threads and want to update the state of a view 457 * from that thread, you should use a {@link Handler}. 458 * </p> 459 * 460 * <a name="FocusHandling"></a> 461 * <h3>Focus Handling</h3> 462 * <p> 463 * The framework will handle routine focus movement in response to user input. 464 * This includes changing the focus as views are removed or hidden, or as new 465 * views become available. Views indicate their willingness to take focus 466 * through the {@link #isFocusable} method. To change whether a view can take 467 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 468 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 469 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 470 * </p> 471 * <p> 472 * Focus movement is based on an algorithm which finds the nearest neighbor in a 473 * given direction. In rare cases, the default algorithm may not match the 474 * intended behavior of the developer. In these situations, you can provide 475 * explicit overrides by using these XML attributes in the layout file: 476 * <pre> 477 * nextFocusDown 478 * nextFocusLeft 479 * nextFocusRight 480 * nextFocusUp 481 * </pre> 482 * </p> 483 * 484 * 485 * <p> 486 * To get a particular view to take focus, call {@link #requestFocus()}. 487 * </p> 488 * 489 * <a name="TouchMode"></a> 490 * <h3>Touch Mode</h3> 491 * <p> 492 * When a user is navigating a user interface via directional keys such as a D-pad, it is 493 * necessary to give focus to actionable items such as buttons so the user can see 494 * what will take input. If the device has touch capabilities, however, and the user 495 * begins interacting with the interface by touching it, it is no longer necessary to 496 * always highlight, or give focus to, a particular view. This motivates a mode 497 * for interaction named 'touch mode'. 498 * </p> 499 * <p> 500 * For a touch capable device, once the user touches the screen, the device 501 * will enter touch mode. From this point onward, only views for which 502 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 503 * Other views that are touchable, like buttons, will not take focus when touched; they will 504 * only fire the on click listeners. 505 * </p> 506 * <p> 507 * Any time a user hits a directional key, such as a D-pad direction, the view device will 508 * exit touch mode, and find a view to take focus, so that the user may resume interacting 509 * with the user interface without touching the screen again. 510 * </p> 511 * <p> 512 * The touch mode state is maintained across {@link android.app.Activity}s. Call 513 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 514 * </p> 515 * 516 * <a name="Scrolling"></a> 517 * <h3>Scrolling</h3> 518 * <p> 519 * The framework provides basic support for views that wish to internally 520 * scroll their content. This includes keeping track of the X and Y scroll 521 * offset as well as mechanisms for drawing scrollbars. See 522 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 523 * {@link #awakenScrollBars()} for more details. 524 * </p> 525 * 526 * <a name="Tags"></a> 527 * <h3>Tags</h3> 528 * <p> 529 * Unlike IDs, tags are not used to identify views. Tags are essentially an 530 * extra piece of information that can be associated with a view. They are most 531 * often used as a convenience to store data related to views in the views 532 * themselves rather than by putting them in a separate structure. 533 * </p> 534 * 535 * <a name="Animation"></a> 536 * <h3>Animation</h3> 537 * <p> 538 * You can attach an {@link Animation} object to a view using 539 * {@link #setAnimation(Animation)} or 540 * {@link #startAnimation(Animation)}. The animation can alter the scale, 541 * rotation, translation and alpha of a view over time. If the animation is 542 * attached to a view that has children, the animation will affect the entire 543 * subtree rooted by that node. When an animation is started, the framework will 544 * take care of redrawing the appropriate views until the animation completes. 545 * </p> 546 * <p> 547 * Starting with Android 3.0, the preferred way of animating views is to use the 548 * {@link android.animation} package APIs. 549 * </p> 550 * 551 * <a name="Security"></a> 552 * <h3>Security</h3> 553 * <p> 554 * Sometimes it is essential that an application be able to verify that an action 555 * is being performed with the full knowledge and consent of the user, such as 556 * granting a permission request, making a purchase or clicking on an advertisement. 557 * Unfortunately, a malicious application could try to spoof the user into 558 * performing these actions, unaware, by concealing the intended purpose of the view. 559 * As a remedy, the framework offers a touch filtering mechanism that can be used to 560 * improve the security of views that provide access to sensitive functionality. 561 * </p><p> 562 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 563 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 564 * will discard touches that are received whenever the view's window is obscured by 565 * another visible window. As a result, the view will not receive touches whenever a 566 * toast, dialog or other window appears above the view's window. 567 * </p><p> 568 * For more fine-grained control over security, consider overriding the 569 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 570 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 571 * </p> 572 * 573 * @attr ref android.R.styleable#View_alpha 574 * @attr ref android.R.styleable#View_background 575 * @attr ref android.R.styleable#View_clickable 576 * @attr ref android.R.styleable#View_contentDescription 577 * @attr ref android.R.styleable#View_drawingCacheQuality 578 * @attr ref android.R.styleable#View_duplicateParentState 579 * @attr ref android.R.styleable#View_id 580 * @attr ref android.R.styleable#View_requiresFadingEdge 581 * @attr ref android.R.styleable#View_fadingEdgeLength 582 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 583 * @attr ref android.R.styleable#View_fitsSystemWindows 584 * @attr ref android.R.styleable#View_isScrollContainer 585 * @attr ref android.R.styleable#View_focusable 586 * @attr ref android.R.styleable#View_focusableInTouchMode 587 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 588 * @attr ref android.R.styleable#View_keepScreenOn 589 * @attr ref android.R.styleable#View_layerType 590 * @attr ref android.R.styleable#View_longClickable 591 * @attr ref android.R.styleable#View_minHeight 592 * @attr ref android.R.styleable#View_minWidth 593 * @attr ref android.R.styleable#View_nextFocusDown 594 * @attr ref android.R.styleable#View_nextFocusLeft 595 * @attr ref android.R.styleable#View_nextFocusRight 596 * @attr ref android.R.styleable#View_nextFocusUp 597 * @attr ref android.R.styleable#View_onClick 598 * @attr ref android.R.styleable#View_padding 599 * @attr ref android.R.styleable#View_paddingBottom 600 * @attr ref android.R.styleable#View_paddingLeft 601 * @attr ref android.R.styleable#View_paddingRight 602 * @attr ref android.R.styleable#View_paddingTop 603 * @attr ref android.R.styleable#View_saveEnabled 604 * @attr ref android.R.styleable#View_rotation 605 * @attr ref android.R.styleable#View_rotationX 606 * @attr ref android.R.styleable#View_rotationY 607 * @attr ref android.R.styleable#View_scaleX 608 * @attr ref android.R.styleable#View_scaleY 609 * @attr ref android.R.styleable#View_scrollX 610 * @attr ref android.R.styleable#View_scrollY 611 * @attr ref android.R.styleable#View_scrollbarSize 612 * @attr ref android.R.styleable#View_scrollbarStyle 613 * @attr ref android.R.styleable#View_scrollbars 614 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 615 * @attr ref android.R.styleable#View_scrollbarFadeDuration 616 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 617 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 618 * @attr ref android.R.styleable#View_scrollbarThumbVertical 619 * @attr ref android.R.styleable#View_scrollbarTrackVertical 620 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 621 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 622 * @attr ref android.R.styleable#View_soundEffectsEnabled 623 * @attr ref android.R.styleable#View_tag 624 * @attr ref android.R.styleable#View_transformPivotX 625 * @attr ref android.R.styleable#View_transformPivotY 626 * @attr ref android.R.styleable#View_translationX 627 * @attr ref android.R.styleable#View_translationY 628 * @attr ref android.R.styleable#View_visibility 629 * 630 * @see android.view.ViewGroup 631 */ 632public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 633 AccessibilityEventSource { 634 private static final boolean DBG = false; 635 636 /** 637 * The logging tag used by this class with android.util.Log. 638 */ 639 protected static final String VIEW_LOG_TAG = "View"; 640 641 /** 642 * Used to mark a View that has no ID. 643 */ 644 public static final int NO_ID = -1; 645 646 /** 647 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 648 * calling setFlags. 649 */ 650 private static final int NOT_FOCUSABLE = 0x00000000; 651 652 /** 653 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 654 * setFlags. 655 */ 656 private static final int FOCUSABLE = 0x00000001; 657 658 /** 659 * Mask for use with setFlags indicating bits used for focus. 660 */ 661 private static final int FOCUSABLE_MASK = 0x00000001; 662 663 /** 664 * This view will adjust its padding to fit sytem windows (e.g. status bar) 665 */ 666 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 667 668 /** 669 * This view is visible. 670 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 671 * android:visibility}. 672 */ 673 public static final int VISIBLE = 0x00000000; 674 675 /** 676 * This view is invisible, but it still takes up space for layout purposes. 677 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 678 * android:visibility}. 679 */ 680 public static final int INVISIBLE = 0x00000004; 681 682 /** 683 * This view is invisible, and it doesn't take any space for layout 684 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 685 * android:visibility}. 686 */ 687 public static final int GONE = 0x00000008; 688 689 /** 690 * Mask for use with setFlags indicating bits used for visibility. 691 * {@hide} 692 */ 693 static final int VISIBILITY_MASK = 0x0000000C; 694 695 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 696 697 /** 698 * This view is enabled. Intrepretation varies by subclass. 699 * Use with ENABLED_MASK when calling setFlags. 700 * {@hide} 701 */ 702 static final int ENABLED = 0x00000000; 703 704 /** 705 * This view is disabled. Intrepretation varies by subclass. 706 * Use with ENABLED_MASK when calling setFlags. 707 * {@hide} 708 */ 709 static final int DISABLED = 0x00000020; 710 711 /** 712 * Mask for use with setFlags indicating bits used for indicating whether 713 * this view is enabled 714 * {@hide} 715 */ 716 static final int ENABLED_MASK = 0x00000020; 717 718 /** 719 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 720 * called and further optimizations will be performed. It is okay to have 721 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 722 * {@hide} 723 */ 724 static final int WILL_NOT_DRAW = 0x00000080; 725 726 /** 727 * Mask for use with setFlags indicating bits used for indicating whether 728 * this view is will draw 729 * {@hide} 730 */ 731 static final int DRAW_MASK = 0x00000080; 732 733 /** 734 * <p>This view doesn't show scrollbars.</p> 735 * {@hide} 736 */ 737 static final int SCROLLBARS_NONE = 0x00000000; 738 739 /** 740 * <p>This view shows horizontal scrollbars.</p> 741 * {@hide} 742 */ 743 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 744 745 /** 746 * <p>This view shows vertical scrollbars.</p> 747 * {@hide} 748 */ 749 static final int SCROLLBARS_VERTICAL = 0x00000200; 750 751 /** 752 * <p>Mask for use with setFlags indicating bits used for indicating which 753 * scrollbars are enabled.</p> 754 * {@hide} 755 */ 756 static final int SCROLLBARS_MASK = 0x00000300; 757 758 /** 759 * Indicates that the view should filter touches when its window is obscured. 760 * Refer to the class comments for more information about this security feature. 761 * {@hide} 762 */ 763 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 764 765 // note flag value 0x00000800 is now available for next flags... 766 767 /** 768 * <p>This view doesn't show fading edges.</p> 769 * {@hide} 770 */ 771 static final int FADING_EDGE_NONE = 0x00000000; 772 773 /** 774 * <p>This view shows horizontal fading edges.</p> 775 * {@hide} 776 */ 777 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 778 779 /** 780 * <p>This view shows vertical fading edges.</p> 781 * {@hide} 782 */ 783 static final int FADING_EDGE_VERTICAL = 0x00002000; 784 785 /** 786 * <p>Mask for use with setFlags indicating bits used for indicating which 787 * fading edges are enabled.</p> 788 * {@hide} 789 */ 790 static final int FADING_EDGE_MASK = 0x00003000; 791 792 /** 793 * <p>Indicates this view can be clicked. When clickable, a View reacts 794 * to clicks by notifying the OnClickListener.<p> 795 * {@hide} 796 */ 797 static final int CLICKABLE = 0x00004000; 798 799 /** 800 * <p>Indicates this view is caching its drawing into a bitmap.</p> 801 * {@hide} 802 */ 803 static final int DRAWING_CACHE_ENABLED = 0x00008000; 804 805 /** 806 * <p>Indicates that no icicle should be saved for this view.<p> 807 * {@hide} 808 */ 809 static final int SAVE_DISABLED = 0x000010000; 810 811 /** 812 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 813 * property.</p> 814 * {@hide} 815 */ 816 static final int SAVE_DISABLED_MASK = 0x000010000; 817 818 /** 819 * <p>Indicates that no drawing cache should ever be created for this view.<p> 820 * {@hide} 821 */ 822 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 823 824 /** 825 * <p>Indicates this view can take / keep focus when int touch mode.</p> 826 * {@hide} 827 */ 828 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 829 830 /** 831 * <p>Enables low quality mode for the drawing cache.</p> 832 */ 833 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 834 835 /** 836 * <p>Enables high quality mode for the drawing cache.</p> 837 */ 838 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 839 840 /** 841 * <p>Enables automatic quality mode for the drawing cache.</p> 842 */ 843 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 844 845 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 846 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 847 }; 848 849 /** 850 * <p>Mask for use with setFlags indicating bits used for the cache 851 * quality property.</p> 852 * {@hide} 853 */ 854 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 855 856 /** 857 * <p> 858 * Indicates this view can be long clicked. When long clickable, a View 859 * reacts to long clicks by notifying the OnLongClickListener or showing a 860 * context menu. 861 * </p> 862 * {@hide} 863 */ 864 static final int LONG_CLICKABLE = 0x00200000; 865 866 /** 867 * <p>Indicates that this view gets its drawable states from its direct parent 868 * and ignores its original internal states.</p> 869 * 870 * @hide 871 */ 872 static final int DUPLICATE_PARENT_STATE = 0x00400000; 873 874 /** 875 * The scrollbar style to display the scrollbars inside the content area, 876 * without increasing the padding. The scrollbars will be overlaid with 877 * translucency on the view's content. 878 */ 879 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 880 881 /** 882 * The scrollbar style to display the scrollbars inside the padded area, 883 * increasing the padding of the view. The scrollbars will not overlap the 884 * content area of the view. 885 */ 886 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 887 888 /** 889 * The scrollbar style to display the scrollbars at the edge of the view, 890 * without increasing the padding. The scrollbars will be overlaid with 891 * translucency. 892 */ 893 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 894 895 /** 896 * The scrollbar style to display the scrollbars at the edge of the view, 897 * increasing the padding of the view. The scrollbars will only overlap the 898 * background, if any. 899 */ 900 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 901 902 /** 903 * Mask to check if the scrollbar style is overlay or inset. 904 * {@hide} 905 */ 906 static final int SCROLLBARS_INSET_MASK = 0x01000000; 907 908 /** 909 * Mask to check if the scrollbar style is inside or outside. 910 * {@hide} 911 */ 912 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 913 914 /** 915 * Mask for scrollbar style. 916 * {@hide} 917 */ 918 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 919 920 /** 921 * View flag indicating that the screen should remain on while the 922 * window containing this view is visible to the user. This effectively 923 * takes care of automatically setting the WindowManager's 924 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 925 */ 926 public static final int KEEP_SCREEN_ON = 0x04000000; 927 928 /** 929 * View flag indicating whether this view should have sound effects enabled 930 * for events such as clicking and touching. 931 */ 932 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 933 934 /** 935 * View flag indicating whether this view should have haptic feedback 936 * enabled for events such as long presses. 937 */ 938 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 939 940 /** 941 * <p>Indicates that the view hierarchy should stop saving state when 942 * it reaches this view. If state saving is initiated immediately at 943 * the view, it will be allowed. 944 * {@hide} 945 */ 946 static final int PARENT_SAVE_DISABLED = 0x20000000; 947 948 /** 949 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 950 * {@hide} 951 */ 952 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 953 954 /** 955 * Horizontal direction of this view is from Left to Right. 956 * Use with {@link #setLayoutDirection}. 957 * {@hide} 958 */ 959 public static final int LAYOUT_DIRECTION_LTR = 0x00000000; 960 961 /** 962 * Horizontal direction of this view is from Right to Left. 963 * Use with {@link #setLayoutDirection}. 964 * {@hide} 965 */ 966 public static final int LAYOUT_DIRECTION_RTL = 0x40000000; 967 968 /** 969 * Horizontal direction of this view is inherited from its parent. 970 * Use with {@link #setLayoutDirection}. 971 * {@hide} 972 */ 973 public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000; 974 975 /** 976 * Horizontal direction of this view is from deduced from the default language 977 * script for the locale. Use with {@link #setLayoutDirection}. 978 * {@hide} 979 */ 980 public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000; 981 982 /** 983 * Mask for use with setFlags indicating bits used for horizontalDirection. 984 * {@hide} 985 */ 986 static final int LAYOUT_DIRECTION_MASK = 0xC0000000; 987 988 /* 989 * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct 990 * flag value. 991 * {@hide} 992 */ 993 private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR, 994 LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE}; 995 996 /** 997 * Default horizontalDirection. 998 * {@hide} 999 */ 1000 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1001 1002 /** 1003 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1004 * should add all focusable Views regardless if they are focusable in touch mode. 1005 */ 1006 public static final int FOCUSABLES_ALL = 0x00000000; 1007 1008 /** 1009 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1010 * should add only Views focusable in touch mode. 1011 */ 1012 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1013 1014 /** 1015 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1016 * item. 1017 */ 1018 public static final int FOCUS_BACKWARD = 0x00000001; 1019 1020 /** 1021 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1022 * item. 1023 */ 1024 public static final int FOCUS_FORWARD = 0x00000002; 1025 1026 /** 1027 * Use with {@link #focusSearch(int)}. Move focus to the left. 1028 */ 1029 public static final int FOCUS_LEFT = 0x00000011; 1030 1031 /** 1032 * Use with {@link #focusSearch(int)}. Move focus up. 1033 */ 1034 public static final int FOCUS_UP = 0x00000021; 1035 1036 /** 1037 * Use with {@link #focusSearch(int)}. Move focus to the right. 1038 */ 1039 public static final int FOCUS_RIGHT = 0x00000042; 1040 1041 /** 1042 * Use with {@link #focusSearch(int)}. Move focus down. 1043 */ 1044 public static final int FOCUS_DOWN = 0x00000082; 1045 1046 /** 1047 * Bits of {@link #getMeasuredWidthAndState()} and 1048 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1049 */ 1050 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1051 1052 /** 1053 * Bits of {@link #getMeasuredWidthAndState()} and 1054 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1055 */ 1056 public static final int MEASURED_STATE_MASK = 0xff000000; 1057 1058 /** 1059 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1060 * for functions that combine both width and height into a single int, 1061 * such as {@link #getMeasuredState()} and the childState argument of 1062 * {@link #resolveSizeAndState(int, int, int)}. 1063 */ 1064 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1065 1066 /** 1067 * Bit of {@link #getMeasuredWidthAndState()} and 1068 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1069 * is smaller that the space the view would like to have. 1070 */ 1071 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1072 1073 /** 1074 * Base View state sets 1075 */ 1076 // Singles 1077 /** 1078 * Indicates the view has no states set. States are used with 1079 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1080 * view depending on its state. 1081 * 1082 * @see android.graphics.drawable.Drawable 1083 * @see #getDrawableState() 1084 */ 1085 protected static final int[] EMPTY_STATE_SET; 1086 /** 1087 * Indicates the view is enabled. States are used with 1088 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1089 * view depending on its state. 1090 * 1091 * @see android.graphics.drawable.Drawable 1092 * @see #getDrawableState() 1093 */ 1094 protected static final int[] ENABLED_STATE_SET; 1095 /** 1096 * Indicates the view is focused. States are used with 1097 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1098 * view depending on its state. 1099 * 1100 * @see android.graphics.drawable.Drawable 1101 * @see #getDrawableState() 1102 */ 1103 protected static final int[] FOCUSED_STATE_SET; 1104 /** 1105 * Indicates the view is selected. States are used with 1106 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1107 * view depending on its state. 1108 * 1109 * @see android.graphics.drawable.Drawable 1110 * @see #getDrawableState() 1111 */ 1112 protected static final int[] SELECTED_STATE_SET; 1113 /** 1114 * Indicates the view is pressed. States are used with 1115 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1116 * view depending on its state. 1117 * 1118 * @see android.graphics.drawable.Drawable 1119 * @see #getDrawableState() 1120 * @hide 1121 */ 1122 protected static final int[] PRESSED_STATE_SET; 1123 /** 1124 * Indicates the view's window has focus. States are used with 1125 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1126 * view depending on its state. 1127 * 1128 * @see android.graphics.drawable.Drawable 1129 * @see #getDrawableState() 1130 */ 1131 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1132 // Doubles 1133 /** 1134 * Indicates the view is enabled and has the focus. 1135 * 1136 * @see #ENABLED_STATE_SET 1137 * @see #FOCUSED_STATE_SET 1138 */ 1139 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1140 /** 1141 * Indicates the view is enabled and selected. 1142 * 1143 * @see #ENABLED_STATE_SET 1144 * @see #SELECTED_STATE_SET 1145 */ 1146 protected static final int[] ENABLED_SELECTED_STATE_SET; 1147 /** 1148 * Indicates the view is enabled and that its window has focus. 1149 * 1150 * @see #ENABLED_STATE_SET 1151 * @see #WINDOW_FOCUSED_STATE_SET 1152 */ 1153 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1154 /** 1155 * Indicates the view is focused and selected. 1156 * 1157 * @see #FOCUSED_STATE_SET 1158 * @see #SELECTED_STATE_SET 1159 */ 1160 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1161 /** 1162 * Indicates the view has the focus and that its window has the focus. 1163 * 1164 * @see #FOCUSED_STATE_SET 1165 * @see #WINDOW_FOCUSED_STATE_SET 1166 */ 1167 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1168 /** 1169 * Indicates the view is selected and that its window has the focus. 1170 * 1171 * @see #SELECTED_STATE_SET 1172 * @see #WINDOW_FOCUSED_STATE_SET 1173 */ 1174 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1175 // Triples 1176 /** 1177 * Indicates the view is enabled, focused and selected. 1178 * 1179 * @see #ENABLED_STATE_SET 1180 * @see #FOCUSED_STATE_SET 1181 * @see #SELECTED_STATE_SET 1182 */ 1183 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1184 /** 1185 * Indicates the view is enabled, focused and its window has the focus. 1186 * 1187 * @see #ENABLED_STATE_SET 1188 * @see #FOCUSED_STATE_SET 1189 * @see #WINDOW_FOCUSED_STATE_SET 1190 */ 1191 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1192 /** 1193 * Indicates the view is enabled, selected and its window has the focus. 1194 * 1195 * @see #ENABLED_STATE_SET 1196 * @see #SELECTED_STATE_SET 1197 * @see #WINDOW_FOCUSED_STATE_SET 1198 */ 1199 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1200 /** 1201 * Indicates the view is focused, selected and its window has the focus. 1202 * 1203 * @see #FOCUSED_STATE_SET 1204 * @see #SELECTED_STATE_SET 1205 * @see #WINDOW_FOCUSED_STATE_SET 1206 */ 1207 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1208 /** 1209 * Indicates the view is enabled, focused, selected and its window 1210 * has the focus. 1211 * 1212 * @see #ENABLED_STATE_SET 1213 * @see #FOCUSED_STATE_SET 1214 * @see #SELECTED_STATE_SET 1215 * @see #WINDOW_FOCUSED_STATE_SET 1216 */ 1217 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1218 /** 1219 * Indicates the view is pressed and its window has the focus. 1220 * 1221 * @see #PRESSED_STATE_SET 1222 * @see #WINDOW_FOCUSED_STATE_SET 1223 */ 1224 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1225 /** 1226 * Indicates the view is pressed and selected. 1227 * 1228 * @see #PRESSED_STATE_SET 1229 * @see #SELECTED_STATE_SET 1230 */ 1231 protected static final int[] PRESSED_SELECTED_STATE_SET; 1232 /** 1233 * Indicates the view is pressed, selected and its window has the focus. 1234 * 1235 * @see #PRESSED_STATE_SET 1236 * @see #SELECTED_STATE_SET 1237 * @see #WINDOW_FOCUSED_STATE_SET 1238 */ 1239 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1240 /** 1241 * Indicates the view is pressed and focused. 1242 * 1243 * @see #PRESSED_STATE_SET 1244 * @see #FOCUSED_STATE_SET 1245 */ 1246 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1247 /** 1248 * Indicates the view is pressed, focused and its window has the focus. 1249 * 1250 * @see #PRESSED_STATE_SET 1251 * @see #FOCUSED_STATE_SET 1252 * @see #WINDOW_FOCUSED_STATE_SET 1253 */ 1254 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1255 /** 1256 * Indicates the view is pressed, focused and selected. 1257 * 1258 * @see #PRESSED_STATE_SET 1259 * @see #SELECTED_STATE_SET 1260 * @see #FOCUSED_STATE_SET 1261 */ 1262 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1263 /** 1264 * Indicates the view is pressed, focused, selected and its window has the focus. 1265 * 1266 * @see #PRESSED_STATE_SET 1267 * @see #FOCUSED_STATE_SET 1268 * @see #SELECTED_STATE_SET 1269 * @see #WINDOW_FOCUSED_STATE_SET 1270 */ 1271 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1272 /** 1273 * Indicates the view is pressed and enabled. 1274 * 1275 * @see #PRESSED_STATE_SET 1276 * @see #ENABLED_STATE_SET 1277 */ 1278 protected static final int[] PRESSED_ENABLED_STATE_SET; 1279 /** 1280 * Indicates the view is pressed, enabled and its window has the focus. 1281 * 1282 * @see #PRESSED_STATE_SET 1283 * @see #ENABLED_STATE_SET 1284 * @see #WINDOW_FOCUSED_STATE_SET 1285 */ 1286 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1287 /** 1288 * Indicates the view is pressed, enabled and selected. 1289 * 1290 * @see #PRESSED_STATE_SET 1291 * @see #ENABLED_STATE_SET 1292 * @see #SELECTED_STATE_SET 1293 */ 1294 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1295 /** 1296 * Indicates the view is pressed, enabled, selected and its window has the 1297 * focus. 1298 * 1299 * @see #PRESSED_STATE_SET 1300 * @see #ENABLED_STATE_SET 1301 * @see #SELECTED_STATE_SET 1302 * @see #WINDOW_FOCUSED_STATE_SET 1303 */ 1304 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1305 /** 1306 * Indicates the view is pressed, enabled and focused. 1307 * 1308 * @see #PRESSED_STATE_SET 1309 * @see #ENABLED_STATE_SET 1310 * @see #FOCUSED_STATE_SET 1311 */ 1312 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1313 /** 1314 * Indicates the view is pressed, enabled, focused and its window has the 1315 * focus. 1316 * 1317 * @see #PRESSED_STATE_SET 1318 * @see #ENABLED_STATE_SET 1319 * @see #FOCUSED_STATE_SET 1320 * @see #WINDOW_FOCUSED_STATE_SET 1321 */ 1322 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1323 /** 1324 * Indicates the view is pressed, enabled, focused and selected. 1325 * 1326 * @see #PRESSED_STATE_SET 1327 * @see #ENABLED_STATE_SET 1328 * @see #SELECTED_STATE_SET 1329 * @see #FOCUSED_STATE_SET 1330 */ 1331 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1332 /** 1333 * Indicates the view is pressed, enabled, focused, selected and its window 1334 * has the focus. 1335 * 1336 * @see #PRESSED_STATE_SET 1337 * @see #ENABLED_STATE_SET 1338 * @see #SELECTED_STATE_SET 1339 * @see #FOCUSED_STATE_SET 1340 * @see #WINDOW_FOCUSED_STATE_SET 1341 */ 1342 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1343 1344 /** 1345 * The order here is very important to {@link #getDrawableState()} 1346 */ 1347 private static final int[][] VIEW_STATE_SETS; 1348 1349 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1350 static final int VIEW_STATE_SELECTED = 1 << 1; 1351 static final int VIEW_STATE_FOCUSED = 1 << 2; 1352 static final int VIEW_STATE_ENABLED = 1 << 3; 1353 static final int VIEW_STATE_PRESSED = 1 << 4; 1354 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1355 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1356 static final int VIEW_STATE_HOVERED = 1 << 7; 1357 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1358 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1359 1360 static final int[] VIEW_STATE_IDS = new int[] { 1361 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1362 R.attr.state_selected, VIEW_STATE_SELECTED, 1363 R.attr.state_focused, VIEW_STATE_FOCUSED, 1364 R.attr.state_enabled, VIEW_STATE_ENABLED, 1365 R.attr.state_pressed, VIEW_STATE_PRESSED, 1366 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1367 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1368 R.attr.state_hovered, VIEW_STATE_HOVERED, 1369 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1370 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1371 }; 1372 1373 static { 1374 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1375 throw new IllegalStateException( 1376 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1377 } 1378 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1379 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1380 int viewState = R.styleable.ViewDrawableStates[i]; 1381 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1382 if (VIEW_STATE_IDS[j] == viewState) { 1383 orderedIds[i * 2] = viewState; 1384 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1385 } 1386 } 1387 } 1388 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1389 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1390 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1391 int numBits = Integer.bitCount(i); 1392 int[] set = new int[numBits]; 1393 int pos = 0; 1394 for (int j = 0; j < orderedIds.length; j += 2) { 1395 if ((i & orderedIds[j+1]) != 0) { 1396 set[pos++] = orderedIds[j]; 1397 } 1398 } 1399 VIEW_STATE_SETS[i] = set; 1400 } 1401 1402 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1403 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1404 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1405 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1406 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1407 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1408 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1409 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1410 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1412 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1413 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1414 | VIEW_STATE_FOCUSED]; 1415 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1416 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1418 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1420 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1421 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1422 | VIEW_STATE_ENABLED]; 1423 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1424 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1425 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1426 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1427 | VIEW_STATE_ENABLED]; 1428 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1429 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1430 | VIEW_STATE_ENABLED]; 1431 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1432 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1433 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1434 1435 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1436 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1437 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1438 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1439 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1440 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1441 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1442 | VIEW_STATE_PRESSED]; 1443 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1445 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1447 | VIEW_STATE_PRESSED]; 1448 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1449 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1450 | VIEW_STATE_PRESSED]; 1451 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1453 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1454 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1456 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1457 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1458 | VIEW_STATE_PRESSED]; 1459 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1460 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1461 | VIEW_STATE_PRESSED]; 1462 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1464 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1465 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1467 | VIEW_STATE_PRESSED]; 1468 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1470 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1471 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1472 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1473 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1474 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1476 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1477 | VIEW_STATE_PRESSED]; 1478 } 1479 1480 /** 1481 * Accessibility event types that are dispatched for text population. 1482 */ 1483 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1484 AccessibilityEvent.TYPE_VIEW_CLICKED 1485 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1486 | AccessibilityEvent.TYPE_VIEW_SELECTED 1487 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1488 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1489 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1490 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1491 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1492 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED; 1493 1494 /** 1495 * Temporary Rect currently for use in setBackground(). This will probably 1496 * be extended in the future to hold our own class with more than just 1497 * a Rect. :) 1498 */ 1499 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1500 1501 /** 1502 * Map used to store views' tags. 1503 */ 1504 private SparseArray<Object> mKeyedTags; 1505 1506 /** 1507 * The next available accessiiblity id. 1508 */ 1509 private static int sNextAccessibilityViewId; 1510 1511 /** 1512 * The animation currently associated with this view. 1513 * @hide 1514 */ 1515 protected Animation mCurrentAnimation = null; 1516 1517 /** 1518 * Width as measured during measure pass. 1519 * {@hide} 1520 */ 1521 @ViewDebug.ExportedProperty(category = "measurement") 1522 int mMeasuredWidth; 1523 1524 /** 1525 * Height as measured during measure pass. 1526 * {@hide} 1527 */ 1528 @ViewDebug.ExportedProperty(category = "measurement") 1529 int mMeasuredHeight; 1530 1531 /** 1532 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1533 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1534 * its display list. This flag, used only when hw accelerated, allows us to clear the 1535 * flag while retaining this information until it's needed (at getDisplayList() time and 1536 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1537 * 1538 * {@hide} 1539 */ 1540 boolean mRecreateDisplayList = false; 1541 1542 /** 1543 * The view's identifier. 1544 * {@hide} 1545 * 1546 * @see #setId(int) 1547 * @see #getId() 1548 */ 1549 @ViewDebug.ExportedProperty(resolveId = true) 1550 int mID = NO_ID; 1551 1552 /** 1553 * The stable ID of this view for accessibility purposes. 1554 */ 1555 int mAccessibilityViewId = NO_ID; 1556 1557 /** 1558 * The view's tag. 1559 * {@hide} 1560 * 1561 * @see #setTag(Object) 1562 * @see #getTag() 1563 */ 1564 protected Object mTag; 1565 1566 // for mPrivateFlags: 1567 /** {@hide} */ 1568 static final int WANTS_FOCUS = 0x00000001; 1569 /** {@hide} */ 1570 static final int FOCUSED = 0x00000002; 1571 /** {@hide} */ 1572 static final int SELECTED = 0x00000004; 1573 /** {@hide} */ 1574 static final int IS_ROOT_NAMESPACE = 0x00000008; 1575 /** {@hide} */ 1576 static final int HAS_BOUNDS = 0x00000010; 1577 /** {@hide} */ 1578 static final int DRAWN = 0x00000020; 1579 /** 1580 * When this flag is set, this view is running an animation on behalf of its 1581 * children and should therefore not cancel invalidate requests, even if they 1582 * lie outside of this view's bounds. 1583 * 1584 * {@hide} 1585 */ 1586 static final int DRAW_ANIMATION = 0x00000040; 1587 /** {@hide} */ 1588 static final int SKIP_DRAW = 0x00000080; 1589 /** {@hide} */ 1590 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1591 /** {@hide} */ 1592 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1593 /** {@hide} */ 1594 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1595 /** {@hide} */ 1596 static final int MEASURED_DIMENSION_SET = 0x00000800; 1597 /** {@hide} */ 1598 static final int FORCE_LAYOUT = 0x00001000; 1599 /** {@hide} */ 1600 static final int LAYOUT_REQUIRED = 0x00002000; 1601 1602 private static final int PRESSED = 0x00004000; 1603 1604 /** {@hide} */ 1605 static final int DRAWING_CACHE_VALID = 0x00008000; 1606 /** 1607 * Flag used to indicate that this view should be drawn once more (and only once 1608 * more) after its animation has completed. 1609 * {@hide} 1610 */ 1611 static final int ANIMATION_STARTED = 0x00010000; 1612 1613 private static final int SAVE_STATE_CALLED = 0x00020000; 1614 1615 /** 1616 * Indicates that the View returned true when onSetAlpha() was called and that 1617 * the alpha must be restored. 1618 * {@hide} 1619 */ 1620 static final int ALPHA_SET = 0x00040000; 1621 1622 /** 1623 * Set by {@link #setScrollContainer(boolean)}. 1624 */ 1625 static final int SCROLL_CONTAINER = 0x00080000; 1626 1627 /** 1628 * Set by {@link #setScrollContainer(boolean)}. 1629 */ 1630 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1631 1632 /** 1633 * View flag indicating whether this view was invalidated (fully or partially.) 1634 * 1635 * @hide 1636 */ 1637 static final int DIRTY = 0x00200000; 1638 1639 /** 1640 * View flag indicating whether this view was invalidated by an opaque 1641 * invalidate request. 1642 * 1643 * @hide 1644 */ 1645 static final int DIRTY_OPAQUE = 0x00400000; 1646 1647 /** 1648 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1649 * 1650 * @hide 1651 */ 1652 static final int DIRTY_MASK = 0x00600000; 1653 1654 /** 1655 * Indicates whether the background is opaque. 1656 * 1657 * @hide 1658 */ 1659 static final int OPAQUE_BACKGROUND = 0x00800000; 1660 1661 /** 1662 * Indicates whether the scrollbars are opaque. 1663 * 1664 * @hide 1665 */ 1666 static final int OPAQUE_SCROLLBARS = 0x01000000; 1667 1668 /** 1669 * Indicates whether the view is opaque. 1670 * 1671 * @hide 1672 */ 1673 static final int OPAQUE_MASK = 0x01800000; 1674 1675 /** 1676 * Indicates a prepressed state; 1677 * the short time between ACTION_DOWN and recognizing 1678 * a 'real' press. Prepressed is used to recognize quick taps 1679 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1680 * 1681 * @hide 1682 */ 1683 private static final int PREPRESSED = 0x02000000; 1684 1685 /** 1686 * Indicates whether the view is temporarily detached. 1687 * 1688 * @hide 1689 */ 1690 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1691 1692 /** 1693 * Indicates that we should awaken scroll bars once attached 1694 * 1695 * @hide 1696 */ 1697 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1698 1699 /** 1700 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1701 * @hide 1702 */ 1703 private static final int HOVERED = 0x10000000; 1704 1705 /** 1706 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1707 * for transform operations 1708 * 1709 * @hide 1710 */ 1711 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1712 1713 /** {@hide} */ 1714 static final int ACTIVATED = 0x40000000; 1715 1716 /** 1717 * Indicates that this view was specifically invalidated, not just dirtied because some 1718 * child view was invalidated. The flag is used to determine when we need to recreate 1719 * a view's display list (as opposed to just returning a reference to its existing 1720 * display list). 1721 * 1722 * @hide 1723 */ 1724 static final int INVALIDATED = 0x80000000; 1725 1726 /* Masks for mPrivateFlags2 */ 1727 1728 /** 1729 * Indicates that this view has reported that it can accept the current drag's content. 1730 * Cleared when the drag operation concludes. 1731 * @hide 1732 */ 1733 static final int DRAG_CAN_ACCEPT = 0x00000001; 1734 1735 /** 1736 * Indicates that this view is currently directly under the drag location in a 1737 * drag-and-drop operation involving content that it can accept. Cleared when 1738 * the drag exits the view, or when the drag operation concludes. 1739 * @hide 1740 */ 1741 static final int DRAG_HOVERED = 0x00000002; 1742 1743 /** 1744 * Indicates whether the view layout direction has been resolved and drawn to the 1745 * right-to-left direction. 1746 * 1747 * @hide 1748 */ 1749 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 0x00000004; 1750 1751 /** 1752 * Indicates whether the view layout direction has been resolved. 1753 * 1754 * @hide 1755 */ 1756 static final int LAYOUT_DIRECTION_RESOLVED = 0x00000008; 1757 1758 1759 /* End of masks for mPrivateFlags2 */ 1760 1761 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1762 1763 /** 1764 * Always allow a user to over-scroll this view, provided it is a 1765 * view that can scroll. 1766 * 1767 * @see #getOverScrollMode() 1768 * @see #setOverScrollMode(int) 1769 */ 1770 public static final int OVER_SCROLL_ALWAYS = 0; 1771 1772 /** 1773 * Allow a user to over-scroll this view only if the content is large 1774 * enough to meaningfully scroll, provided it is a view that can scroll. 1775 * 1776 * @see #getOverScrollMode() 1777 * @see #setOverScrollMode(int) 1778 */ 1779 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1780 1781 /** 1782 * Never allow a user to over-scroll this view. 1783 * 1784 * @see #getOverScrollMode() 1785 * @see #setOverScrollMode(int) 1786 */ 1787 public static final int OVER_SCROLL_NEVER = 2; 1788 1789 /** 1790 * View has requested the system UI (status bar) to be visible (the default). 1791 * 1792 * @see #setSystemUiVisibility(int) 1793 */ 1794 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 1795 1796 /** 1797 * View has requested the system UI to enter an unobtrusive "low profile" mode. 1798 * 1799 * This is for use in games, book readers, video players, or any other "immersive" application 1800 * where the usual system chrome is deemed too distracting. 1801 * 1802 * In low profile mode, the status bar and/or navigation icons may dim. 1803 * 1804 * @see #setSystemUiVisibility(int) 1805 */ 1806 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 1807 1808 /** 1809 * View has requested that the system navigation be temporarily hidden. 1810 * 1811 * This is an even less obtrusive state than that called for by 1812 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 1813 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 1814 * those to disappear. This is useful (in conjunction with the 1815 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 1816 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 1817 * window flags) for displaying content using every last pixel on the display. 1818 * 1819 * There is a limitation: because navigation controls are so important, the least user 1820 * interaction will cause them to reappear immediately. 1821 * 1822 * @see #setSystemUiVisibility(int) 1823 */ 1824 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 1825 1826 /** 1827 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 1828 */ 1829 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 1830 1831 /** 1832 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 1833 */ 1834 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 1835 1836 /** 1837 * @hide 1838 * 1839 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1840 * out of the public fields to keep the undefined bits out of the developer's way. 1841 * 1842 * Flag to make the status bar not expandable. Unless you also 1843 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1844 */ 1845 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1846 1847 /** 1848 * @hide 1849 * 1850 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1851 * out of the public fields to keep the undefined bits out of the developer's way. 1852 * 1853 * Flag to hide notification icons and scrolling ticker text. 1854 */ 1855 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1856 1857 /** 1858 * @hide 1859 * 1860 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1861 * out of the public fields to keep the undefined bits out of the developer's way. 1862 * 1863 * Flag to disable incoming notification alerts. This will not block 1864 * icons, but it will block sound, vibrating and other visual or aural notifications. 1865 */ 1866 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1867 1868 /** 1869 * @hide 1870 * 1871 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1872 * out of the public fields to keep the undefined bits out of the developer's way. 1873 * 1874 * Flag to hide only the scrolling ticker. Note that 1875 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1876 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1877 */ 1878 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1879 1880 /** 1881 * @hide 1882 * 1883 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1884 * out of the public fields to keep the undefined bits out of the developer's way. 1885 * 1886 * Flag to hide the center system info area. 1887 */ 1888 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1889 1890 /** 1891 * @hide 1892 * 1893 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1894 * out of the public fields to keep the undefined bits out of the developer's way. 1895 * 1896 * Flag to hide only the home button. Don't use this 1897 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1898 */ 1899 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 1900 1901 /** 1902 * @hide 1903 * 1904 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1905 * out of the public fields to keep the undefined bits out of the developer's way. 1906 * 1907 * Flag to hide only the back button. Don't use this 1908 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1909 */ 1910 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1911 1912 /** 1913 * @hide 1914 * 1915 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1916 * out of the public fields to keep the undefined bits out of the developer's way. 1917 * 1918 * Flag to hide only the clock. You might use this if your activity has 1919 * its own clock making the status bar's clock redundant. 1920 */ 1921 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1922 1923 /** 1924 * @hide 1925 * 1926 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1927 * out of the public fields to keep the undefined bits out of the developer's way. 1928 * 1929 * Flag to hide only the recent apps button. Don't use this 1930 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1931 */ 1932 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 1933 1934 /** 1935 * @hide 1936 * 1937 * NOTE: This flag may only be used in subtreeSystemUiVisibility, etc. etc. 1938 * 1939 * This hides HOME and RECENT and is provided for compatibility with interim implementations. 1940 */ 1941 @Deprecated 1942 public static final int STATUS_BAR_DISABLE_NAVIGATION = 1943 STATUS_BAR_DISABLE_HOME | STATUS_BAR_DISABLE_RECENT; 1944 1945 /** 1946 * @hide 1947 */ 1948 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 1949 1950 /** 1951 * These are the system UI flags that can be cleared by events outside 1952 * of an application. Currently this is just the ability to tap on the 1953 * screen while hiding the navigation bar to have it return. 1954 * @hide 1955 */ 1956 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 1957 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION; 1958 1959 /** 1960 * Find views that render the specified text. 1961 * 1962 * @see #findViewsWithText(ArrayList, CharSequence, int) 1963 */ 1964 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 1965 1966 /** 1967 * Find find views that contain the specified content description. 1968 * 1969 * @see #findViewsWithText(ArrayList, CharSequence, int) 1970 */ 1971 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 1972 1973 /** 1974 * Find views that contain {@link AccessibilityNodeProvider}. Such 1975 * a View is a root of virtual view hierarchy and may contain the searched 1976 * text. If this flag is set Views with providers are automatically 1977 * added and it is a responsibility of the client to call the APIs of 1978 * the provider to determine whether the virtual tree rooted at this View 1979 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 1980 * represeting the virtual views with this text. 1981 * 1982 * @see #findViewsWithText(ArrayList, CharSequence, int) 1983 * 1984 * @hide 1985 */ 1986 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 1987 1988 /** 1989 * Controls the over-scroll mode for this view. 1990 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1991 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1992 * and {@link #OVER_SCROLL_NEVER}. 1993 */ 1994 private int mOverScrollMode; 1995 1996 /** 1997 * The parent this view is attached to. 1998 * {@hide} 1999 * 2000 * @see #getParent() 2001 */ 2002 protected ViewParent mParent; 2003 2004 /** 2005 * {@hide} 2006 */ 2007 AttachInfo mAttachInfo; 2008 2009 /** 2010 * {@hide} 2011 */ 2012 @ViewDebug.ExportedProperty(flagMapping = { 2013 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2014 name = "FORCE_LAYOUT"), 2015 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2016 name = "LAYOUT_REQUIRED"), 2017 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2018 name = "DRAWING_CACHE_INVALID", outputIf = false), 2019 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2020 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2021 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2022 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2023 }) 2024 int mPrivateFlags; 2025 int mPrivateFlags2; 2026 2027 /** 2028 * This view's request for the visibility of the status bar. 2029 * @hide 2030 */ 2031 @ViewDebug.ExportedProperty(flagMapping = { 2032 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2033 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2034 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2035 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2036 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2037 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2038 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2039 equals = SYSTEM_UI_FLAG_VISIBLE, 2040 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2041 }) 2042 int mSystemUiVisibility; 2043 2044 /** 2045 * Count of how many windows this view has been attached to. 2046 */ 2047 int mWindowAttachCount; 2048 2049 /** 2050 * The layout parameters associated with this view and used by the parent 2051 * {@link android.view.ViewGroup} to determine how this view should be 2052 * laid out. 2053 * {@hide} 2054 */ 2055 protected ViewGroup.LayoutParams mLayoutParams; 2056 2057 /** 2058 * The view flags hold various views states. 2059 * {@hide} 2060 */ 2061 @ViewDebug.ExportedProperty 2062 int mViewFlags; 2063 2064 static class TransformationInfo { 2065 /** 2066 * The transform matrix for the View. This transform is calculated internally 2067 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2068 * is used by default. Do *not* use this variable directly; instead call 2069 * getMatrix(), which will automatically recalculate the matrix if necessary 2070 * to get the correct matrix based on the latest rotation and scale properties. 2071 */ 2072 private final Matrix mMatrix = new Matrix(); 2073 2074 /** 2075 * The transform matrix for the View. This transform is calculated internally 2076 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2077 * is used by default. Do *not* use this variable directly; instead call 2078 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2079 * to get the correct matrix based on the latest rotation and scale properties. 2080 */ 2081 private Matrix mInverseMatrix; 2082 2083 /** 2084 * An internal variable that tracks whether we need to recalculate the 2085 * transform matrix, based on whether the rotation or scaleX/Y properties 2086 * have changed since the matrix was last calculated. 2087 */ 2088 boolean mMatrixDirty = false; 2089 2090 /** 2091 * An internal variable that tracks whether we need to recalculate the 2092 * transform matrix, based on whether the rotation or scaleX/Y properties 2093 * have changed since the matrix was last calculated. 2094 */ 2095 private boolean mInverseMatrixDirty = true; 2096 2097 /** 2098 * A variable that tracks whether we need to recalculate the 2099 * transform matrix, based on whether the rotation or scaleX/Y properties 2100 * have changed since the matrix was last calculated. This variable 2101 * is only valid after a call to updateMatrix() or to a function that 2102 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2103 */ 2104 private boolean mMatrixIsIdentity = true; 2105 2106 /** 2107 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2108 */ 2109 private Camera mCamera = null; 2110 2111 /** 2112 * This matrix is used when computing the matrix for 3D rotations. 2113 */ 2114 private Matrix matrix3D = null; 2115 2116 /** 2117 * These prev values are used to recalculate a centered pivot point when necessary. The 2118 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2119 * set), so thes values are only used then as well. 2120 */ 2121 private int mPrevWidth = -1; 2122 private int mPrevHeight = -1; 2123 2124 /** 2125 * The degrees rotation around the vertical axis through the pivot point. 2126 */ 2127 @ViewDebug.ExportedProperty 2128 float mRotationY = 0f; 2129 2130 /** 2131 * The degrees rotation around the horizontal axis through the pivot point. 2132 */ 2133 @ViewDebug.ExportedProperty 2134 float mRotationX = 0f; 2135 2136 /** 2137 * The degrees rotation around the pivot point. 2138 */ 2139 @ViewDebug.ExportedProperty 2140 float mRotation = 0f; 2141 2142 /** 2143 * The amount of translation of the object away from its left property (post-layout). 2144 */ 2145 @ViewDebug.ExportedProperty 2146 float mTranslationX = 0f; 2147 2148 /** 2149 * The amount of translation of the object away from its top property (post-layout). 2150 */ 2151 @ViewDebug.ExportedProperty 2152 float mTranslationY = 0f; 2153 2154 /** 2155 * The amount of scale in the x direction around the pivot point. A 2156 * value of 1 means no scaling is applied. 2157 */ 2158 @ViewDebug.ExportedProperty 2159 float mScaleX = 1f; 2160 2161 /** 2162 * The amount of scale in the y direction around the pivot point. A 2163 * value of 1 means no scaling is applied. 2164 */ 2165 @ViewDebug.ExportedProperty 2166 float mScaleY = 1f; 2167 2168 /** 2169 * The amount of scale in the x direction around the pivot point. A 2170 * value of 1 means no scaling is applied. 2171 */ 2172 @ViewDebug.ExportedProperty 2173 float mPivotX = 0f; 2174 2175 /** 2176 * The amount of scale in the y direction around the pivot point. A 2177 * value of 1 means no scaling is applied. 2178 */ 2179 @ViewDebug.ExportedProperty 2180 float mPivotY = 0f; 2181 2182 /** 2183 * The opacity of the View. This is a value from 0 to 1, where 0 means 2184 * completely transparent and 1 means completely opaque. 2185 */ 2186 @ViewDebug.ExportedProperty 2187 float mAlpha = 1f; 2188 } 2189 2190 TransformationInfo mTransformationInfo; 2191 2192 private boolean mLastIsOpaque; 2193 2194 /** 2195 * Convenience value to check for float values that are close enough to zero to be considered 2196 * zero. 2197 */ 2198 private static final float NONZERO_EPSILON = .001f; 2199 2200 /** 2201 * The distance in pixels from the left edge of this view's parent 2202 * to the left edge of this view. 2203 * {@hide} 2204 */ 2205 @ViewDebug.ExportedProperty(category = "layout") 2206 protected int mLeft; 2207 /** 2208 * The distance in pixels from the left edge of this view's parent 2209 * to the right edge of this view. 2210 * {@hide} 2211 */ 2212 @ViewDebug.ExportedProperty(category = "layout") 2213 protected int mRight; 2214 /** 2215 * The distance in pixels from the top edge of this view's parent 2216 * to the top edge of this view. 2217 * {@hide} 2218 */ 2219 @ViewDebug.ExportedProperty(category = "layout") 2220 protected int mTop; 2221 /** 2222 * The distance in pixels from the top edge of this view's parent 2223 * to the bottom edge of this view. 2224 * {@hide} 2225 */ 2226 @ViewDebug.ExportedProperty(category = "layout") 2227 protected int mBottom; 2228 2229 /** 2230 * The offset, in pixels, by which the content of this view is scrolled 2231 * horizontally. 2232 * {@hide} 2233 */ 2234 @ViewDebug.ExportedProperty(category = "scrolling") 2235 protected int mScrollX; 2236 /** 2237 * The offset, in pixels, by which the content of this view is scrolled 2238 * vertically. 2239 * {@hide} 2240 */ 2241 @ViewDebug.ExportedProperty(category = "scrolling") 2242 protected int mScrollY; 2243 2244 /** 2245 * The left padding in pixels, that is the distance in pixels between the 2246 * left edge of this view and the left edge of its content. 2247 * {@hide} 2248 */ 2249 @ViewDebug.ExportedProperty(category = "padding") 2250 protected int mPaddingLeft; 2251 /** 2252 * The right padding in pixels, that is the distance in pixels between the 2253 * right edge of this view and the right edge of its content. 2254 * {@hide} 2255 */ 2256 @ViewDebug.ExportedProperty(category = "padding") 2257 protected int mPaddingRight; 2258 /** 2259 * The top padding in pixels, that is the distance in pixels between the 2260 * top edge of this view and the top edge of its content. 2261 * {@hide} 2262 */ 2263 @ViewDebug.ExportedProperty(category = "padding") 2264 protected int mPaddingTop; 2265 /** 2266 * The bottom padding in pixels, that is the distance in pixels between the 2267 * bottom edge of this view and the bottom edge of its content. 2268 * {@hide} 2269 */ 2270 @ViewDebug.ExportedProperty(category = "padding") 2271 protected int mPaddingBottom; 2272 2273 /** 2274 * Briefly describes the view and is primarily used for accessibility support. 2275 */ 2276 private CharSequence mContentDescription; 2277 2278 /** 2279 * Cache the paddingRight set by the user to append to the scrollbar's size. 2280 * 2281 * @hide 2282 */ 2283 @ViewDebug.ExportedProperty(category = "padding") 2284 protected int mUserPaddingRight; 2285 2286 /** 2287 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2288 * 2289 * @hide 2290 */ 2291 @ViewDebug.ExportedProperty(category = "padding") 2292 protected int mUserPaddingBottom; 2293 2294 /** 2295 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2296 * 2297 * @hide 2298 */ 2299 @ViewDebug.ExportedProperty(category = "padding") 2300 protected int mUserPaddingLeft; 2301 2302 /** 2303 * Cache if the user padding is relative. 2304 * 2305 */ 2306 @ViewDebug.ExportedProperty(category = "padding") 2307 boolean mUserPaddingRelative; 2308 2309 /** 2310 * Cache the paddingStart set by the user to append to the scrollbar's size. 2311 * 2312 */ 2313 @ViewDebug.ExportedProperty(category = "padding") 2314 int mUserPaddingStart; 2315 2316 /** 2317 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2318 * 2319 */ 2320 @ViewDebug.ExportedProperty(category = "padding") 2321 int mUserPaddingEnd; 2322 2323 /** 2324 * @hide 2325 */ 2326 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2327 /** 2328 * @hide 2329 */ 2330 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2331 2332 private Drawable mBGDrawable; 2333 2334 private int mBackgroundResource; 2335 private boolean mBackgroundSizeChanged; 2336 2337 static class ListenerInfo { 2338 /** 2339 * Listener used to dispatch focus change events. 2340 * This field should be made private, so it is hidden from the SDK. 2341 * {@hide} 2342 */ 2343 protected OnFocusChangeListener mOnFocusChangeListener; 2344 2345 /** 2346 * Listeners for layout change events. 2347 */ 2348 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2349 2350 /** 2351 * Listeners for attach events. 2352 */ 2353 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2354 2355 /** 2356 * Listener used to dispatch click events. 2357 * This field should be made private, so it is hidden from the SDK. 2358 * {@hide} 2359 */ 2360 public OnClickListener mOnClickListener; 2361 2362 /** 2363 * Listener used to dispatch long click events. 2364 * This field should be made private, so it is hidden from the SDK. 2365 * {@hide} 2366 */ 2367 protected OnLongClickListener mOnLongClickListener; 2368 2369 /** 2370 * Listener used to build the context menu. 2371 * This field should be made private, so it is hidden from the SDK. 2372 * {@hide} 2373 */ 2374 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2375 2376 private OnKeyListener mOnKeyListener; 2377 2378 private OnTouchListener mOnTouchListener; 2379 2380 private OnHoverListener mOnHoverListener; 2381 2382 private OnGenericMotionListener mOnGenericMotionListener; 2383 2384 private OnDragListener mOnDragListener; 2385 2386 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2387 } 2388 2389 ListenerInfo mListenerInfo; 2390 2391 /** 2392 * The application environment this view lives in. 2393 * This field should be made private, so it is hidden from the SDK. 2394 * {@hide} 2395 */ 2396 protected Context mContext; 2397 2398 private final Resources mResources; 2399 2400 private ScrollabilityCache mScrollCache; 2401 2402 private int[] mDrawableState = null; 2403 2404 /** 2405 * Set to true when drawing cache is enabled and cannot be created. 2406 * 2407 * @hide 2408 */ 2409 public boolean mCachingFailed; 2410 2411 private Bitmap mDrawingCache; 2412 private Bitmap mUnscaledDrawingCache; 2413 private HardwareLayer mHardwareLayer; 2414 DisplayList mDisplayList; 2415 2416 /** 2417 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2418 * the user may specify which view to go to next. 2419 */ 2420 private int mNextFocusLeftId = View.NO_ID; 2421 2422 /** 2423 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2424 * the user may specify which view to go to next. 2425 */ 2426 private int mNextFocusRightId = View.NO_ID; 2427 2428 /** 2429 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2430 * the user may specify which view to go to next. 2431 */ 2432 private int mNextFocusUpId = View.NO_ID; 2433 2434 /** 2435 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2436 * the user may specify which view to go to next. 2437 */ 2438 private int mNextFocusDownId = View.NO_ID; 2439 2440 /** 2441 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2442 * the user may specify which view to go to next. 2443 */ 2444 int mNextFocusForwardId = View.NO_ID; 2445 2446 private CheckForLongPress mPendingCheckForLongPress; 2447 private CheckForTap mPendingCheckForTap = null; 2448 private PerformClick mPerformClick; 2449 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2450 2451 private UnsetPressedState mUnsetPressedState; 2452 2453 /** 2454 * Whether the long press's action has been invoked. The tap's action is invoked on the 2455 * up event while a long press is invoked as soon as the long press duration is reached, so 2456 * a long press could be performed before the tap is checked, in which case the tap's action 2457 * should not be invoked. 2458 */ 2459 private boolean mHasPerformedLongPress; 2460 2461 /** 2462 * The minimum height of the view. We'll try our best to have the height 2463 * of this view to at least this amount. 2464 */ 2465 @ViewDebug.ExportedProperty(category = "measurement") 2466 private int mMinHeight; 2467 2468 /** 2469 * The minimum width of the view. We'll try our best to have the width 2470 * of this view to at least this amount. 2471 */ 2472 @ViewDebug.ExportedProperty(category = "measurement") 2473 private int mMinWidth; 2474 2475 /** 2476 * The delegate to handle touch events that are physically in this view 2477 * but should be handled by another view. 2478 */ 2479 private TouchDelegate mTouchDelegate = null; 2480 2481 /** 2482 * Solid color to use as a background when creating the drawing cache. Enables 2483 * the cache to use 16 bit bitmaps instead of 32 bit. 2484 */ 2485 private int mDrawingCacheBackgroundColor = 0; 2486 2487 /** 2488 * Special tree observer used when mAttachInfo is null. 2489 */ 2490 private ViewTreeObserver mFloatingTreeObserver; 2491 2492 /** 2493 * Cache the touch slop from the context that created the view. 2494 */ 2495 private int mTouchSlop; 2496 2497 /** 2498 * Object that handles automatic animation of view properties. 2499 */ 2500 private ViewPropertyAnimator mAnimator = null; 2501 2502 /** 2503 * Flag indicating that a drag can cross window boundaries. When 2504 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2505 * with this flag set, all visible applications will be able to participate 2506 * in the drag operation and receive the dragged content. 2507 * 2508 * @hide 2509 */ 2510 public static final int DRAG_FLAG_GLOBAL = 1; 2511 2512 /** 2513 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2514 */ 2515 private float mVerticalScrollFactor; 2516 2517 /** 2518 * Position of the vertical scroll bar. 2519 */ 2520 private int mVerticalScrollbarPosition; 2521 2522 /** 2523 * Position the scroll bar at the default position as determined by the system. 2524 */ 2525 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2526 2527 /** 2528 * Position the scroll bar along the left edge. 2529 */ 2530 public static final int SCROLLBAR_POSITION_LEFT = 1; 2531 2532 /** 2533 * Position the scroll bar along the right edge. 2534 */ 2535 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2536 2537 /** 2538 * Indicates that the view does not have a layer. 2539 * 2540 * @see #getLayerType() 2541 * @see #setLayerType(int, android.graphics.Paint) 2542 * @see #LAYER_TYPE_SOFTWARE 2543 * @see #LAYER_TYPE_HARDWARE 2544 */ 2545 public static final int LAYER_TYPE_NONE = 0; 2546 2547 /** 2548 * <p>Indicates that the view has a software layer. A software layer is backed 2549 * by a bitmap and causes the view to be rendered using Android's software 2550 * rendering pipeline, even if hardware acceleration is enabled.</p> 2551 * 2552 * <p>Software layers have various usages:</p> 2553 * <p>When the application is not using hardware acceleration, a software layer 2554 * is useful to apply a specific color filter and/or blending mode and/or 2555 * translucency to a view and all its children.</p> 2556 * <p>When the application is using hardware acceleration, a software layer 2557 * is useful to render drawing primitives not supported by the hardware 2558 * accelerated pipeline. It can also be used to cache a complex view tree 2559 * into a texture and reduce the complexity of drawing operations. For instance, 2560 * when animating a complex view tree with a translation, a software layer can 2561 * be used to render the view tree only once.</p> 2562 * <p>Software layers should be avoided when the affected view tree updates 2563 * often. Every update will require to re-render the software layer, which can 2564 * potentially be slow (particularly when hardware acceleration is turned on 2565 * since the layer will have to be uploaded into a hardware texture after every 2566 * update.)</p> 2567 * 2568 * @see #getLayerType() 2569 * @see #setLayerType(int, android.graphics.Paint) 2570 * @see #LAYER_TYPE_NONE 2571 * @see #LAYER_TYPE_HARDWARE 2572 */ 2573 public static final int LAYER_TYPE_SOFTWARE = 1; 2574 2575 /** 2576 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2577 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2578 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2579 * rendering pipeline, but only if hardware acceleration is turned on for the 2580 * view hierarchy. When hardware acceleration is turned off, hardware layers 2581 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2582 * 2583 * <p>A hardware layer is useful to apply a specific color filter and/or 2584 * blending mode and/or translucency to a view and all its children.</p> 2585 * <p>A hardware layer can be used to cache a complex view tree into a 2586 * texture and reduce the complexity of drawing operations. For instance, 2587 * when animating a complex view tree with a translation, a hardware layer can 2588 * be used to render the view tree only once.</p> 2589 * <p>A hardware layer can also be used to increase the rendering quality when 2590 * rotation transformations are applied on a view. It can also be used to 2591 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2592 * 2593 * @see #getLayerType() 2594 * @see #setLayerType(int, android.graphics.Paint) 2595 * @see #LAYER_TYPE_NONE 2596 * @see #LAYER_TYPE_SOFTWARE 2597 */ 2598 public static final int LAYER_TYPE_HARDWARE = 2; 2599 2600 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2601 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2602 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2603 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2604 }) 2605 int mLayerType = LAYER_TYPE_NONE; 2606 Paint mLayerPaint; 2607 Rect mLocalDirtyRect; 2608 2609 /** 2610 * Set to true when the view is sending hover accessibility events because it 2611 * is the innermost hovered view. 2612 */ 2613 private boolean mSendingHoverAccessibilityEvents; 2614 2615 /** 2616 * Delegate for injecting accessiblity functionality. 2617 */ 2618 AccessibilityDelegate mAccessibilityDelegate; 2619 2620 /** 2621 * Text direction is inherited thru {@link ViewGroup} 2622 * @hide 2623 */ 2624 public static final int TEXT_DIRECTION_INHERIT = 0; 2625 2626 /** 2627 * Text direction is using "first strong algorithm". The first strong directional character 2628 * determines the paragraph direction. If there is no strong directional character, the 2629 * paragraph direction is the view's resolved layout direction. 2630 * 2631 * @hide 2632 */ 2633 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 2634 2635 /** 2636 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 2637 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 2638 * If there are neither, the paragraph direction is the view's resolved layout direction. 2639 * 2640 * @hide 2641 */ 2642 public static final int TEXT_DIRECTION_ANY_RTL = 2; 2643 2644 /** 2645 * Text direction is forced to LTR. 2646 * 2647 * @hide 2648 */ 2649 public static final int TEXT_DIRECTION_LTR = 3; 2650 2651 /** 2652 * Text direction is forced to RTL. 2653 * 2654 * @hide 2655 */ 2656 public static final int TEXT_DIRECTION_RTL = 4; 2657 2658 /** 2659 * Text direction is coming from the system Locale. 2660 * 2661 * @hide 2662 */ 2663 public static final int TEXT_DIRECTION_LOCALE = 5; 2664 2665 /** 2666 * Default text direction is inherited 2667 * 2668 * @hide 2669 */ 2670 protected static int DEFAULT_TEXT_DIRECTION = TEXT_DIRECTION_INHERIT; 2671 2672 /** 2673 * The text direction that has been defined by {@link #setTextDirection(int)}. 2674 * 2675 * {@hide} 2676 */ 2677 @ViewDebug.ExportedProperty(category = "text", mapping = { 2678 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2679 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2680 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2681 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2682 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 2683 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 2684 }) 2685 private int mTextDirection = DEFAULT_TEXT_DIRECTION; 2686 2687 /** 2688 * The resolved text direction. This needs resolution if the value is 2689 * TEXT_DIRECTION_INHERIT. The resolution matches mTextDirection if it is 2690 * not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds up the parent 2691 * chain of the view. 2692 * 2693 * {@hide} 2694 */ 2695 @ViewDebug.ExportedProperty(category = "text", mapping = { 2696 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2697 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2698 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2699 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2700 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 2701 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 2702 }) 2703 private int mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 2704 2705 /** 2706 * Consistency verifier for debugging purposes. 2707 * @hide 2708 */ 2709 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2710 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2711 new InputEventConsistencyVerifier(this, 0) : null; 2712 2713 /** 2714 * Simple constructor to use when creating a view from code. 2715 * 2716 * @param context The Context the view is running in, through which it can 2717 * access the current theme, resources, etc. 2718 */ 2719 public View(Context context) { 2720 mContext = context; 2721 mResources = context != null ? context.getResources() : null; 2722 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT; 2723 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2724 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2725 mUserPaddingStart = -1; 2726 mUserPaddingEnd = -1; 2727 mUserPaddingRelative = false; 2728 } 2729 2730 /** 2731 * Constructor that is called when inflating a view from XML. This is called 2732 * when a view is being constructed from an XML file, supplying attributes 2733 * that were specified in the XML file. This version uses a default style of 2734 * 0, so the only attribute values applied are those in the Context's Theme 2735 * and the given AttributeSet. 2736 * 2737 * <p> 2738 * The method onFinishInflate() will be called after all children have been 2739 * added. 2740 * 2741 * @param context The Context the view is running in, through which it can 2742 * access the current theme, resources, etc. 2743 * @param attrs The attributes of the XML tag that is inflating the view. 2744 * @see #View(Context, AttributeSet, int) 2745 */ 2746 public View(Context context, AttributeSet attrs) { 2747 this(context, attrs, 0); 2748 } 2749 2750 /** 2751 * Perform inflation from XML and apply a class-specific base style. This 2752 * constructor of View allows subclasses to use their own base style when 2753 * they are inflating. For example, a Button class's constructor would call 2754 * this version of the super class constructor and supply 2755 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2756 * the theme's button style to modify all of the base view attributes (in 2757 * particular its background) as well as the Button class's attributes. 2758 * 2759 * @param context The Context the view is running in, through which it can 2760 * access the current theme, resources, etc. 2761 * @param attrs The attributes of the XML tag that is inflating the view. 2762 * @param defStyle The default style to apply to this view. If 0, no style 2763 * will be applied (beyond what is included in the theme). This may 2764 * either be an attribute resource, whose value will be retrieved 2765 * from the current theme, or an explicit style resource. 2766 * @see #View(Context, AttributeSet) 2767 */ 2768 public View(Context context, AttributeSet attrs, int defStyle) { 2769 this(context); 2770 2771 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2772 defStyle, 0); 2773 2774 Drawable background = null; 2775 2776 int leftPadding = -1; 2777 int topPadding = -1; 2778 int rightPadding = -1; 2779 int bottomPadding = -1; 2780 int startPadding = -1; 2781 int endPadding = -1; 2782 2783 int padding = -1; 2784 2785 int viewFlagValues = 0; 2786 int viewFlagMasks = 0; 2787 2788 boolean setScrollContainer = false; 2789 2790 int x = 0; 2791 int y = 0; 2792 2793 float tx = 0; 2794 float ty = 0; 2795 float rotation = 0; 2796 float rotationX = 0; 2797 float rotationY = 0; 2798 float sx = 1f; 2799 float sy = 1f; 2800 boolean transformSet = false; 2801 2802 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2803 2804 int overScrollMode = mOverScrollMode; 2805 final int N = a.getIndexCount(); 2806 for (int i = 0; i < N; i++) { 2807 int attr = a.getIndex(i); 2808 switch (attr) { 2809 case com.android.internal.R.styleable.View_background: 2810 background = a.getDrawable(attr); 2811 break; 2812 case com.android.internal.R.styleable.View_padding: 2813 padding = a.getDimensionPixelSize(attr, -1); 2814 break; 2815 case com.android.internal.R.styleable.View_paddingLeft: 2816 leftPadding = a.getDimensionPixelSize(attr, -1); 2817 break; 2818 case com.android.internal.R.styleable.View_paddingTop: 2819 topPadding = a.getDimensionPixelSize(attr, -1); 2820 break; 2821 case com.android.internal.R.styleable.View_paddingRight: 2822 rightPadding = a.getDimensionPixelSize(attr, -1); 2823 break; 2824 case com.android.internal.R.styleable.View_paddingBottom: 2825 bottomPadding = a.getDimensionPixelSize(attr, -1); 2826 break; 2827 case com.android.internal.R.styleable.View_paddingStart: 2828 startPadding = a.getDimensionPixelSize(attr, -1); 2829 break; 2830 case com.android.internal.R.styleable.View_paddingEnd: 2831 endPadding = a.getDimensionPixelSize(attr, -1); 2832 break; 2833 case com.android.internal.R.styleable.View_scrollX: 2834 x = a.getDimensionPixelOffset(attr, 0); 2835 break; 2836 case com.android.internal.R.styleable.View_scrollY: 2837 y = a.getDimensionPixelOffset(attr, 0); 2838 break; 2839 case com.android.internal.R.styleable.View_alpha: 2840 setAlpha(a.getFloat(attr, 1f)); 2841 break; 2842 case com.android.internal.R.styleable.View_transformPivotX: 2843 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2844 break; 2845 case com.android.internal.R.styleable.View_transformPivotY: 2846 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2847 break; 2848 case com.android.internal.R.styleable.View_translationX: 2849 tx = a.getDimensionPixelOffset(attr, 0); 2850 transformSet = true; 2851 break; 2852 case com.android.internal.R.styleable.View_translationY: 2853 ty = a.getDimensionPixelOffset(attr, 0); 2854 transformSet = true; 2855 break; 2856 case com.android.internal.R.styleable.View_rotation: 2857 rotation = a.getFloat(attr, 0); 2858 transformSet = true; 2859 break; 2860 case com.android.internal.R.styleable.View_rotationX: 2861 rotationX = a.getFloat(attr, 0); 2862 transformSet = true; 2863 break; 2864 case com.android.internal.R.styleable.View_rotationY: 2865 rotationY = a.getFloat(attr, 0); 2866 transformSet = true; 2867 break; 2868 case com.android.internal.R.styleable.View_scaleX: 2869 sx = a.getFloat(attr, 1f); 2870 transformSet = true; 2871 break; 2872 case com.android.internal.R.styleable.View_scaleY: 2873 sy = a.getFloat(attr, 1f); 2874 transformSet = true; 2875 break; 2876 case com.android.internal.R.styleable.View_id: 2877 mID = a.getResourceId(attr, NO_ID); 2878 break; 2879 case com.android.internal.R.styleable.View_tag: 2880 mTag = a.getText(attr); 2881 break; 2882 case com.android.internal.R.styleable.View_fitsSystemWindows: 2883 if (a.getBoolean(attr, false)) { 2884 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2885 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2886 } 2887 break; 2888 case com.android.internal.R.styleable.View_focusable: 2889 if (a.getBoolean(attr, false)) { 2890 viewFlagValues |= FOCUSABLE; 2891 viewFlagMasks |= FOCUSABLE_MASK; 2892 } 2893 break; 2894 case com.android.internal.R.styleable.View_focusableInTouchMode: 2895 if (a.getBoolean(attr, false)) { 2896 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2897 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2898 } 2899 break; 2900 case com.android.internal.R.styleable.View_clickable: 2901 if (a.getBoolean(attr, false)) { 2902 viewFlagValues |= CLICKABLE; 2903 viewFlagMasks |= CLICKABLE; 2904 } 2905 break; 2906 case com.android.internal.R.styleable.View_longClickable: 2907 if (a.getBoolean(attr, false)) { 2908 viewFlagValues |= LONG_CLICKABLE; 2909 viewFlagMasks |= LONG_CLICKABLE; 2910 } 2911 break; 2912 case com.android.internal.R.styleable.View_saveEnabled: 2913 if (!a.getBoolean(attr, true)) { 2914 viewFlagValues |= SAVE_DISABLED; 2915 viewFlagMasks |= SAVE_DISABLED_MASK; 2916 } 2917 break; 2918 case com.android.internal.R.styleable.View_duplicateParentState: 2919 if (a.getBoolean(attr, false)) { 2920 viewFlagValues |= DUPLICATE_PARENT_STATE; 2921 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2922 } 2923 break; 2924 case com.android.internal.R.styleable.View_visibility: 2925 final int visibility = a.getInt(attr, 0); 2926 if (visibility != 0) { 2927 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2928 viewFlagMasks |= VISIBILITY_MASK; 2929 } 2930 break; 2931 case com.android.internal.R.styleable.View_layoutDirection: 2932 // Clear any HORIZONTAL_DIRECTION flag already set 2933 viewFlagValues &= ~LAYOUT_DIRECTION_MASK; 2934 // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute 2935 final int layoutDirection = a.getInt(attr, -1); 2936 if (layoutDirection != -1) { 2937 viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection]; 2938 } else { 2939 // Set to default (LAYOUT_DIRECTION_INHERIT) 2940 viewFlagValues |= LAYOUT_DIRECTION_DEFAULT; 2941 } 2942 viewFlagMasks |= LAYOUT_DIRECTION_MASK; 2943 break; 2944 case com.android.internal.R.styleable.View_drawingCacheQuality: 2945 final int cacheQuality = a.getInt(attr, 0); 2946 if (cacheQuality != 0) { 2947 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2948 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2949 } 2950 break; 2951 case com.android.internal.R.styleable.View_contentDescription: 2952 mContentDescription = a.getString(attr); 2953 break; 2954 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2955 if (!a.getBoolean(attr, true)) { 2956 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2957 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2958 } 2959 break; 2960 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2961 if (!a.getBoolean(attr, true)) { 2962 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2963 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2964 } 2965 break; 2966 case R.styleable.View_scrollbars: 2967 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2968 if (scrollbars != SCROLLBARS_NONE) { 2969 viewFlagValues |= scrollbars; 2970 viewFlagMasks |= SCROLLBARS_MASK; 2971 initializeScrollbars(a); 2972 } 2973 break; 2974 //noinspection deprecation 2975 case R.styleable.View_fadingEdge: 2976 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 2977 // Ignore the attribute starting with ICS 2978 break; 2979 } 2980 // With builds < ICS, fall through and apply fading edges 2981 case R.styleable.View_requiresFadingEdge: 2982 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2983 if (fadingEdge != FADING_EDGE_NONE) { 2984 viewFlagValues |= fadingEdge; 2985 viewFlagMasks |= FADING_EDGE_MASK; 2986 initializeFadingEdge(a); 2987 } 2988 break; 2989 case R.styleable.View_scrollbarStyle: 2990 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2991 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2992 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2993 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2994 } 2995 break; 2996 case R.styleable.View_isScrollContainer: 2997 setScrollContainer = true; 2998 if (a.getBoolean(attr, false)) { 2999 setScrollContainer(true); 3000 } 3001 break; 3002 case com.android.internal.R.styleable.View_keepScreenOn: 3003 if (a.getBoolean(attr, false)) { 3004 viewFlagValues |= KEEP_SCREEN_ON; 3005 viewFlagMasks |= KEEP_SCREEN_ON; 3006 } 3007 break; 3008 case R.styleable.View_filterTouchesWhenObscured: 3009 if (a.getBoolean(attr, false)) { 3010 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3011 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3012 } 3013 break; 3014 case R.styleable.View_nextFocusLeft: 3015 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3016 break; 3017 case R.styleable.View_nextFocusRight: 3018 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3019 break; 3020 case R.styleable.View_nextFocusUp: 3021 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3022 break; 3023 case R.styleable.View_nextFocusDown: 3024 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3025 break; 3026 case R.styleable.View_nextFocusForward: 3027 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3028 break; 3029 case R.styleable.View_minWidth: 3030 mMinWidth = a.getDimensionPixelSize(attr, 0); 3031 break; 3032 case R.styleable.View_minHeight: 3033 mMinHeight = a.getDimensionPixelSize(attr, 0); 3034 break; 3035 case R.styleable.View_onClick: 3036 if (context.isRestricted()) { 3037 throw new IllegalStateException("The android:onClick attribute cannot " 3038 + "be used within a restricted context"); 3039 } 3040 3041 final String handlerName = a.getString(attr); 3042 if (handlerName != null) { 3043 setOnClickListener(new OnClickListener() { 3044 private Method mHandler; 3045 3046 public void onClick(View v) { 3047 if (mHandler == null) { 3048 try { 3049 mHandler = getContext().getClass().getMethod(handlerName, 3050 View.class); 3051 } catch (NoSuchMethodException e) { 3052 int id = getId(); 3053 String idText = id == NO_ID ? "" : " with id '" 3054 + getContext().getResources().getResourceEntryName( 3055 id) + "'"; 3056 throw new IllegalStateException("Could not find a method " + 3057 handlerName + "(View) in the activity " 3058 + getContext().getClass() + " for onClick handler" 3059 + " on view " + View.this.getClass() + idText, e); 3060 } 3061 } 3062 3063 try { 3064 mHandler.invoke(getContext(), View.this); 3065 } catch (IllegalAccessException e) { 3066 throw new IllegalStateException("Could not execute non " 3067 + "public method of the activity", e); 3068 } catch (InvocationTargetException e) { 3069 throw new IllegalStateException("Could not execute " 3070 + "method of the activity", e); 3071 } 3072 } 3073 }); 3074 } 3075 break; 3076 case R.styleable.View_overScrollMode: 3077 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3078 break; 3079 case R.styleable.View_verticalScrollbarPosition: 3080 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3081 break; 3082 case R.styleable.View_layerType: 3083 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3084 break; 3085 case R.styleable.View_textDirection: 3086 mTextDirection = a.getInt(attr, DEFAULT_TEXT_DIRECTION); 3087 break; 3088 } 3089 } 3090 3091 a.recycle(); 3092 3093 setOverScrollMode(overScrollMode); 3094 3095 if (background != null) { 3096 setBackgroundDrawable(background); 3097 } 3098 3099 mUserPaddingRelative = (startPadding >= 0 || endPadding >= 0); 3100 3101 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3102 // layout direction). Those cached values will be used later during padding resolution. 3103 mUserPaddingStart = startPadding; 3104 mUserPaddingEnd = endPadding; 3105 3106 if (padding >= 0) { 3107 leftPadding = padding; 3108 topPadding = padding; 3109 rightPadding = padding; 3110 bottomPadding = padding; 3111 } 3112 3113 // If the user specified the padding (either with android:padding or 3114 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3115 // use the default padding or the padding from the background drawable 3116 // (stored at this point in mPadding*) 3117 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3118 topPadding >= 0 ? topPadding : mPaddingTop, 3119 rightPadding >= 0 ? rightPadding : mPaddingRight, 3120 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3121 3122 if (viewFlagMasks != 0) { 3123 setFlags(viewFlagValues, viewFlagMasks); 3124 } 3125 3126 // Needs to be called after mViewFlags is set 3127 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3128 recomputePadding(); 3129 } 3130 3131 if (x != 0 || y != 0) { 3132 scrollTo(x, y); 3133 } 3134 3135 if (transformSet) { 3136 setTranslationX(tx); 3137 setTranslationY(ty); 3138 setRotation(rotation); 3139 setRotationX(rotationX); 3140 setRotationY(rotationY); 3141 setScaleX(sx); 3142 setScaleY(sy); 3143 } 3144 3145 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3146 setScrollContainer(true); 3147 } 3148 3149 computeOpaqueFlags(); 3150 } 3151 3152 /** 3153 * Non-public constructor for use in testing 3154 */ 3155 View() { 3156 mResources = null; 3157 } 3158 3159 /** 3160 * <p> 3161 * Initializes the fading edges from a given set of styled attributes. This 3162 * method should be called by subclasses that need fading edges and when an 3163 * instance of these subclasses is created programmatically rather than 3164 * being inflated from XML. This method is automatically called when the XML 3165 * is inflated. 3166 * </p> 3167 * 3168 * @param a the styled attributes set to initialize the fading edges from 3169 */ 3170 protected void initializeFadingEdge(TypedArray a) { 3171 initScrollCache(); 3172 3173 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3174 R.styleable.View_fadingEdgeLength, 3175 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3176 } 3177 3178 /** 3179 * Returns the size of the vertical faded edges used to indicate that more 3180 * content in this view is visible. 3181 * 3182 * @return The size in pixels of the vertical faded edge or 0 if vertical 3183 * faded edges are not enabled for this view. 3184 * @attr ref android.R.styleable#View_fadingEdgeLength 3185 */ 3186 public int getVerticalFadingEdgeLength() { 3187 if (isVerticalFadingEdgeEnabled()) { 3188 ScrollabilityCache cache = mScrollCache; 3189 if (cache != null) { 3190 return cache.fadingEdgeLength; 3191 } 3192 } 3193 return 0; 3194 } 3195 3196 /** 3197 * Set the size of the faded edge used to indicate that more content in this 3198 * view is available. Will not change whether the fading edge is enabled; use 3199 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3200 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3201 * for the vertical or horizontal fading edges. 3202 * 3203 * @param length The size in pixels of the faded edge used to indicate that more 3204 * content in this view is visible. 3205 */ 3206 public void setFadingEdgeLength(int length) { 3207 initScrollCache(); 3208 mScrollCache.fadingEdgeLength = length; 3209 } 3210 3211 /** 3212 * Returns the size of the horizontal faded edges used to indicate that more 3213 * content in this view is visible. 3214 * 3215 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3216 * faded edges are not enabled for this view. 3217 * @attr ref android.R.styleable#View_fadingEdgeLength 3218 */ 3219 public int getHorizontalFadingEdgeLength() { 3220 if (isHorizontalFadingEdgeEnabled()) { 3221 ScrollabilityCache cache = mScrollCache; 3222 if (cache != null) { 3223 return cache.fadingEdgeLength; 3224 } 3225 } 3226 return 0; 3227 } 3228 3229 /** 3230 * Returns the width of the vertical scrollbar. 3231 * 3232 * @return The width in pixels of the vertical scrollbar or 0 if there 3233 * is no vertical scrollbar. 3234 */ 3235 public int getVerticalScrollbarWidth() { 3236 ScrollabilityCache cache = mScrollCache; 3237 if (cache != null) { 3238 ScrollBarDrawable scrollBar = cache.scrollBar; 3239 if (scrollBar != null) { 3240 int size = scrollBar.getSize(true); 3241 if (size <= 0) { 3242 size = cache.scrollBarSize; 3243 } 3244 return size; 3245 } 3246 return 0; 3247 } 3248 return 0; 3249 } 3250 3251 /** 3252 * Returns the height of the horizontal scrollbar. 3253 * 3254 * @return The height in pixels of the horizontal scrollbar or 0 if 3255 * there is no horizontal scrollbar. 3256 */ 3257 protected int getHorizontalScrollbarHeight() { 3258 ScrollabilityCache cache = mScrollCache; 3259 if (cache != null) { 3260 ScrollBarDrawable scrollBar = cache.scrollBar; 3261 if (scrollBar != null) { 3262 int size = scrollBar.getSize(false); 3263 if (size <= 0) { 3264 size = cache.scrollBarSize; 3265 } 3266 return size; 3267 } 3268 return 0; 3269 } 3270 return 0; 3271 } 3272 3273 /** 3274 * <p> 3275 * Initializes the scrollbars from a given set of styled attributes. This 3276 * method should be called by subclasses that need scrollbars and when an 3277 * instance of these subclasses is created programmatically rather than 3278 * being inflated from XML. This method is automatically called when the XML 3279 * is inflated. 3280 * </p> 3281 * 3282 * @param a the styled attributes set to initialize the scrollbars from 3283 */ 3284 protected void initializeScrollbars(TypedArray a) { 3285 initScrollCache(); 3286 3287 final ScrollabilityCache scrollabilityCache = mScrollCache; 3288 3289 if (scrollabilityCache.scrollBar == null) { 3290 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3291 } 3292 3293 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3294 3295 if (!fadeScrollbars) { 3296 scrollabilityCache.state = ScrollabilityCache.ON; 3297 } 3298 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3299 3300 3301 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3302 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3303 .getScrollBarFadeDuration()); 3304 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3305 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3306 ViewConfiguration.getScrollDefaultDelay()); 3307 3308 3309 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3310 com.android.internal.R.styleable.View_scrollbarSize, 3311 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3312 3313 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3314 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3315 3316 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3317 if (thumb != null) { 3318 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3319 } 3320 3321 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3322 false); 3323 if (alwaysDraw) { 3324 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3325 } 3326 3327 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3328 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3329 3330 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3331 if (thumb != null) { 3332 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3333 } 3334 3335 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3336 false); 3337 if (alwaysDraw) { 3338 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3339 } 3340 3341 // Re-apply user/background padding so that scrollbar(s) get added 3342 resolvePadding(); 3343 } 3344 3345 /** 3346 * <p> 3347 * Initalizes the scrollability cache if necessary. 3348 * </p> 3349 */ 3350 private void initScrollCache() { 3351 if (mScrollCache == null) { 3352 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3353 } 3354 } 3355 3356 /** 3357 * Set the position of the vertical scroll bar. Should be one of 3358 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3359 * {@link #SCROLLBAR_POSITION_RIGHT}. 3360 * 3361 * @param position Where the vertical scroll bar should be positioned. 3362 */ 3363 public void setVerticalScrollbarPosition(int position) { 3364 if (mVerticalScrollbarPosition != position) { 3365 mVerticalScrollbarPosition = position; 3366 computeOpaqueFlags(); 3367 resolvePadding(); 3368 } 3369 } 3370 3371 /** 3372 * @return The position where the vertical scroll bar will show, if applicable. 3373 * @see #setVerticalScrollbarPosition(int) 3374 */ 3375 public int getVerticalScrollbarPosition() { 3376 return mVerticalScrollbarPosition; 3377 } 3378 3379 ListenerInfo getListenerInfo() { 3380 if (mListenerInfo != null) { 3381 return mListenerInfo; 3382 } 3383 mListenerInfo = new ListenerInfo(); 3384 return mListenerInfo; 3385 } 3386 3387 /** 3388 * Register a callback to be invoked when focus of this view changed. 3389 * 3390 * @param l The callback that will run. 3391 */ 3392 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3393 getListenerInfo().mOnFocusChangeListener = l; 3394 } 3395 3396 /** 3397 * Add a listener that will be called when the bounds of the view change due to 3398 * layout processing. 3399 * 3400 * @param listener The listener that will be called when layout bounds change. 3401 */ 3402 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3403 ListenerInfo li = getListenerInfo(); 3404 if (li.mOnLayoutChangeListeners == null) { 3405 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3406 } 3407 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3408 li.mOnLayoutChangeListeners.add(listener); 3409 } 3410 } 3411 3412 /** 3413 * Remove a listener for layout changes. 3414 * 3415 * @param listener The listener for layout bounds change. 3416 */ 3417 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3418 ListenerInfo li = mListenerInfo; 3419 if (li == null || li.mOnLayoutChangeListeners == null) { 3420 return; 3421 } 3422 li.mOnLayoutChangeListeners.remove(listener); 3423 } 3424 3425 /** 3426 * Add a listener for attach state changes. 3427 * 3428 * This listener will be called whenever this view is attached or detached 3429 * from a window. Remove the listener using 3430 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3431 * 3432 * @param listener Listener to attach 3433 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3434 */ 3435 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3436 ListenerInfo li = getListenerInfo(); 3437 if (li.mOnAttachStateChangeListeners == null) { 3438 li.mOnAttachStateChangeListeners 3439 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3440 } 3441 li.mOnAttachStateChangeListeners.add(listener); 3442 } 3443 3444 /** 3445 * Remove a listener for attach state changes. The listener will receive no further 3446 * notification of window attach/detach events. 3447 * 3448 * @param listener Listener to remove 3449 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3450 */ 3451 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3452 ListenerInfo li = mListenerInfo; 3453 if (li == null || li.mOnAttachStateChangeListeners == null) { 3454 return; 3455 } 3456 li.mOnAttachStateChangeListeners.remove(listener); 3457 } 3458 3459 /** 3460 * Returns the focus-change callback registered for this view. 3461 * 3462 * @return The callback, or null if one is not registered. 3463 */ 3464 public OnFocusChangeListener getOnFocusChangeListener() { 3465 ListenerInfo li = mListenerInfo; 3466 return li != null ? li.mOnFocusChangeListener : null; 3467 } 3468 3469 /** 3470 * Register a callback to be invoked when this view is clicked. If this view is not 3471 * clickable, it becomes clickable. 3472 * 3473 * @param l The callback that will run 3474 * 3475 * @see #setClickable(boolean) 3476 */ 3477 public void setOnClickListener(OnClickListener l) { 3478 if (!isClickable()) { 3479 setClickable(true); 3480 } 3481 getListenerInfo().mOnClickListener = l; 3482 } 3483 3484 /** 3485 * Return whether this view has an attached OnClickListener. Returns 3486 * true if there is a listener, false if there is none. 3487 */ 3488 public boolean hasOnClickListeners() { 3489 ListenerInfo li = mListenerInfo; 3490 return (li != null && li.mOnClickListener != null); 3491 } 3492 3493 /** 3494 * Register a callback to be invoked when this view is clicked and held. If this view is not 3495 * long clickable, it becomes long clickable. 3496 * 3497 * @param l The callback that will run 3498 * 3499 * @see #setLongClickable(boolean) 3500 */ 3501 public void setOnLongClickListener(OnLongClickListener l) { 3502 if (!isLongClickable()) { 3503 setLongClickable(true); 3504 } 3505 getListenerInfo().mOnLongClickListener = l; 3506 } 3507 3508 /** 3509 * Register a callback to be invoked when the context menu for this view is 3510 * being built. If this view is not long clickable, it becomes long clickable. 3511 * 3512 * @param l The callback that will run 3513 * 3514 */ 3515 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3516 if (!isLongClickable()) { 3517 setLongClickable(true); 3518 } 3519 getListenerInfo().mOnCreateContextMenuListener = l; 3520 } 3521 3522 /** 3523 * Call this view's OnClickListener, if it is defined. Performs all normal 3524 * actions associated with clicking: reporting accessibility event, playing 3525 * a sound, etc. 3526 * 3527 * @return True there was an assigned OnClickListener that was called, false 3528 * otherwise is returned. 3529 */ 3530 public boolean performClick() { 3531 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3532 3533 ListenerInfo li = mListenerInfo; 3534 if (li != null && li.mOnClickListener != null) { 3535 playSoundEffect(SoundEffectConstants.CLICK); 3536 li.mOnClickListener.onClick(this); 3537 return true; 3538 } 3539 3540 return false; 3541 } 3542 3543 /** 3544 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3545 * this only calls the listener, and does not do any associated clicking 3546 * actions like reporting an accessibility event. 3547 * 3548 * @return True there was an assigned OnClickListener that was called, false 3549 * otherwise is returned. 3550 */ 3551 public boolean callOnClick() { 3552 ListenerInfo li = mListenerInfo; 3553 if (li != null && li.mOnClickListener != null) { 3554 li.mOnClickListener.onClick(this); 3555 return true; 3556 } 3557 return false; 3558 } 3559 3560 /** 3561 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3562 * OnLongClickListener did not consume the event. 3563 * 3564 * @return True if one of the above receivers consumed the event, false otherwise. 3565 */ 3566 public boolean performLongClick() { 3567 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3568 3569 boolean handled = false; 3570 ListenerInfo li = mListenerInfo; 3571 if (li != null && li.mOnLongClickListener != null) { 3572 handled = li.mOnLongClickListener.onLongClick(View.this); 3573 } 3574 if (!handled) { 3575 handled = showContextMenu(); 3576 } 3577 if (handled) { 3578 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3579 } 3580 return handled; 3581 } 3582 3583 /** 3584 * Performs button-related actions during a touch down event. 3585 * 3586 * @param event The event. 3587 * @return True if the down was consumed. 3588 * 3589 * @hide 3590 */ 3591 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3592 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3593 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3594 return true; 3595 } 3596 } 3597 return false; 3598 } 3599 3600 /** 3601 * Bring up the context menu for this view. 3602 * 3603 * @return Whether a context menu was displayed. 3604 */ 3605 public boolean showContextMenu() { 3606 return getParent().showContextMenuForChild(this); 3607 } 3608 3609 /** 3610 * Bring up the context menu for this view, referring to the item under the specified point. 3611 * 3612 * @param x The referenced x coordinate. 3613 * @param y The referenced y coordinate. 3614 * @param metaState The keyboard modifiers that were pressed. 3615 * @return Whether a context menu was displayed. 3616 * 3617 * @hide 3618 */ 3619 public boolean showContextMenu(float x, float y, int metaState) { 3620 return showContextMenu(); 3621 } 3622 3623 /** 3624 * Start an action mode. 3625 * 3626 * @param callback Callback that will control the lifecycle of the action mode 3627 * @return The new action mode if it is started, null otherwise 3628 * 3629 * @see ActionMode 3630 */ 3631 public ActionMode startActionMode(ActionMode.Callback callback) { 3632 return getParent().startActionModeForChild(this, callback); 3633 } 3634 3635 /** 3636 * Register a callback to be invoked when a key is pressed in this view. 3637 * @param l the key listener to attach to this view 3638 */ 3639 public void setOnKeyListener(OnKeyListener l) { 3640 getListenerInfo().mOnKeyListener = l; 3641 } 3642 3643 /** 3644 * Register a callback to be invoked when a touch event is sent to this view. 3645 * @param l the touch listener to attach to this view 3646 */ 3647 public void setOnTouchListener(OnTouchListener l) { 3648 getListenerInfo().mOnTouchListener = l; 3649 } 3650 3651 /** 3652 * Register a callback to be invoked when a generic motion event is sent to this view. 3653 * @param l the generic motion listener to attach to this view 3654 */ 3655 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3656 getListenerInfo().mOnGenericMotionListener = l; 3657 } 3658 3659 /** 3660 * Register a callback to be invoked when a hover event is sent to this view. 3661 * @param l the hover listener to attach to this view 3662 */ 3663 public void setOnHoverListener(OnHoverListener l) { 3664 getListenerInfo().mOnHoverListener = l; 3665 } 3666 3667 /** 3668 * Register a drag event listener callback object for this View. The parameter is 3669 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3670 * View, the system calls the 3671 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3672 * @param l An implementation of {@link android.view.View.OnDragListener}. 3673 */ 3674 public void setOnDragListener(OnDragListener l) { 3675 getListenerInfo().mOnDragListener = l; 3676 } 3677 3678 /** 3679 * Give this view focus. This will cause 3680 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3681 * 3682 * Note: this does not check whether this {@link View} should get focus, it just 3683 * gives it focus no matter what. It should only be called internally by framework 3684 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3685 * 3686 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3687 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3688 * focus moved when requestFocus() is called. It may not always 3689 * apply, in which case use the default View.FOCUS_DOWN. 3690 * @param previouslyFocusedRect The rectangle of the view that had focus 3691 * prior in this View's coordinate system. 3692 */ 3693 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3694 if (DBG) { 3695 System.out.println(this + " requestFocus()"); 3696 } 3697 3698 if ((mPrivateFlags & FOCUSED) == 0) { 3699 mPrivateFlags |= FOCUSED; 3700 3701 if (mParent != null) { 3702 mParent.requestChildFocus(this, this); 3703 } 3704 3705 onFocusChanged(true, direction, previouslyFocusedRect); 3706 refreshDrawableState(); 3707 } 3708 } 3709 3710 /** 3711 * Request that a rectangle of this view be visible on the screen, 3712 * scrolling if necessary just enough. 3713 * 3714 * <p>A View should call this if it maintains some notion of which part 3715 * of its content is interesting. For example, a text editing view 3716 * should call this when its cursor moves. 3717 * 3718 * @param rectangle The rectangle. 3719 * @return Whether any parent scrolled. 3720 */ 3721 public boolean requestRectangleOnScreen(Rect rectangle) { 3722 return requestRectangleOnScreen(rectangle, false); 3723 } 3724 3725 /** 3726 * Request that a rectangle of this view be visible on the screen, 3727 * scrolling if necessary just enough. 3728 * 3729 * <p>A View should call this if it maintains some notion of which part 3730 * of its content is interesting. For example, a text editing view 3731 * should call this when its cursor moves. 3732 * 3733 * <p>When <code>immediate</code> is set to true, scrolling will not be 3734 * animated. 3735 * 3736 * @param rectangle The rectangle. 3737 * @param immediate True to forbid animated scrolling, false otherwise 3738 * @return Whether any parent scrolled. 3739 */ 3740 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3741 View child = this; 3742 ViewParent parent = mParent; 3743 boolean scrolled = false; 3744 while (parent != null) { 3745 scrolled |= parent.requestChildRectangleOnScreen(child, 3746 rectangle, immediate); 3747 3748 // offset rect so next call has the rectangle in the 3749 // coordinate system of its direct child. 3750 rectangle.offset(child.getLeft(), child.getTop()); 3751 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3752 3753 if (!(parent instanceof View)) { 3754 break; 3755 } 3756 3757 child = (View) parent; 3758 parent = child.getParent(); 3759 } 3760 return scrolled; 3761 } 3762 3763 /** 3764 * Called when this view wants to give up focus. This will cause 3765 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3766 */ 3767 public void clearFocus() { 3768 if (DBG) { 3769 System.out.println(this + " clearFocus()"); 3770 } 3771 3772 if ((mPrivateFlags & FOCUSED) != 0) { 3773 // If this is the first focusable do not clear focus since the we 3774 // try to give it focus every time a view clears its focus. Hence, 3775 // the view that would gain focus already has it. 3776 View firstFocusable = getFirstFocusable(); 3777 if (firstFocusable == this) { 3778 return; 3779 } 3780 3781 mPrivateFlags &= ~FOCUSED; 3782 3783 if (mParent != null) { 3784 mParent.clearChildFocus(this); 3785 } 3786 3787 onFocusChanged(false, 0, null); 3788 refreshDrawableState(); 3789 3790 // The view cleared focus and invoked the callbacks, so now is the 3791 // time to give focus to the the first focusable to ensure that the 3792 // gain focus is announced after clear focus. 3793 if (firstFocusable != null) { 3794 firstFocusable.requestFocus(FOCUS_FORWARD); 3795 } 3796 } 3797 } 3798 3799 private View getFirstFocusable() { 3800 ViewRootImpl viewRoot = getViewRootImpl(); 3801 if (viewRoot != null) { 3802 return viewRoot.focusSearch(null, FOCUS_FORWARD); 3803 } 3804 return null; 3805 } 3806 3807 /** 3808 * Called to clear the focus of a view that is about to be removed. 3809 * Doesn't call clearChildFocus, which prevents this view from taking 3810 * focus again before it has been removed from the parent 3811 */ 3812 void clearFocusForRemoval() { 3813 if ((mPrivateFlags & FOCUSED) != 0) { 3814 mPrivateFlags &= ~FOCUSED; 3815 3816 onFocusChanged(false, 0, null); 3817 refreshDrawableState(); 3818 } 3819 } 3820 3821 /** 3822 * Called internally by the view system when a new view is getting focus. 3823 * This is what clears the old focus. 3824 */ 3825 void unFocus() { 3826 if (DBG) { 3827 System.out.println(this + " unFocus()"); 3828 } 3829 3830 if ((mPrivateFlags & FOCUSED) != 0) { 3831 mPrivateFlags &= ~FOCUSED; 3832 3833 onFocusChanged(false, 0, null); 3834 refreshDrawableState(); 3835 } 3836 } 3837 3838 /** 3839 * Returns true if this view has focus iteself, or is the ancestor of the 3840 * view that has focus. 3841 * 3842 * @return True if this view has or contains focus, false otherwise. 3843 */ 3844 @ViewDebug.ExportedProperty(category = "focus") 3845 public boolean hasFocus() { 3846 return (mPrivateFlags & FOCUSED) != 0; 3847 } 3848 3849 /** 3850 * Returns true if this view is focusable or if it contains a reachable View 3851 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3852 * is a View whose parents do not block descendants focus. 3853 * 3854 * Only {@link #VISIBLE} views are considered focusable. 3855 * 3856 * @return True if the view is focusable or if the view contains a focusable 3857 * View, false otherwise. 3858 * 3859 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3860 */ 3861 public boolean hasFocusable() { 3862 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3863 } 3864 3865 /** 3866 * Called by the view system when the focus state of this view changes. 3867 * When the focus change event is caused by directional navigation, direction 3868 * and previouslyFocusedRect provide insight into where the focus is coming from. 3869 * When overriding, be sure to call up through to the super class so that 3870 * the standard focus handling will occur. 3871 * 3872 * @param gainFocus True if the View has focus; false otherwise. 3873 * @param direction The direction focus has moved when requestFocus() 3874 * is called to give this view focus. Values are 3875 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3876 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3877 * It may not always apply, in which case use the default. 3878 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3879 * system, of the previously focused view. If applicable, this will be 3880 * passed in as finer grained information about where the focus is coming 3881 * from (in addition to direction). Will be <code>null</code> otherwise. 3882 */ 3883 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3884 if (gainFocus) { 3885 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3886 } 3887 3888 InputMethodManager imm = InputMethodManager.peekInstance(); 3889 if (!gainFocus) { 3890 if (isPressed()) { 3891 setPressed(false); 3892 } 3893 if (imm != null && mAttachInfo != null 3894 && mAttachInfo.mHasWindowFocus) { 3895 imm.focusOut(this); 3896 } 3897 onFocusLost(); 3898 } else if (imm != null && mAttachInfo != null 3899 && mAttachInfo.mHasWindowFocus) { 3900 imm.focusIn(this); 3901 } 3902 3903 invalidate(true); 3904 ListenerInfo li = mListenerInfo; 3905 if (li != null && li.mOnFocusChangeListener != null) { 3906 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 3907 } 3908 3909 if (mAttachInfo != null) { 3910 mAttachInfo.mKeyDispatchState.reset(this); 3911 } 3912 } 3913 3914 /** 3915 * Sends an accessibility event of the given type. If accessiiblity is 3916 * not enabled this method has no effect. The default implementation calls 3917 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3918 * to populate information about the event source (this View), then calls 3919 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3920 * populate the text content of the event source including its descendants, 3921 * and last calls 3922 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3923 * on its parent to resuest sending of the event to interested parties. 3924 * <p> 3925 * If an {@link AccessibilityDelegate} has been specified via calling 3926 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3927 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 3928 * responsible for handling this call. 3929 * </p> 3930 * 3931 * @param eventType The type of the event to send, as defined by several types from 3932 * {@link android.view.accessibility.AccessibilityEvent}, such as 3933 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 3934 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 3935 * 3936 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3937 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3938 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3939 * @see AccessibilityDelegate 3940 */ 3941 public void sendAccessibilityEvent(int eventType) { 3942 if (mAccessibilityDelegate != null) { 3943 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 3944 } else { 3945 sendAccessibilityEventInternal(eventType); 3946 } 3947 } 3948 3949 /** 3950 * @see #sendAccessibilityEvent(int) 3951 * 3952 * Note: Called from the default {@link AccessibilityDelegate}. 3953 */ 3954 void sendAccessibilityEventInternal(int eventType) { 3955 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3956 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3957 } 3958 } 3959 3960 /** 3961 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3962 * takes as an argument an empty {@link AccessibilityEvent} and does not 3963 * perform a check whether accessibility is enabled. 3964 * <p> 3965 * If an {@link AccessibilityDelegate} has been specified via calling 3966 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3967 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 3968 * is responsible for handling this call. 3969 * </p> 3970 * 3971 * @param event The event to send. 3972 * 3973 * @see #sendAccessibilityEvent(int) 3974 */ 3975 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3976 if (mAccessibilityDelegate != null) { 3977 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 3978 } else { 3979 sendAccessibilityEventUncheckedInternal(event); 3980 } 3981 } 3982 3983 /** 3984 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 3985 * 3986 * Note: Called from the default {@link AccessibilityDelegate}. 3987 */ 3988 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 3989 if (!isShown()) { 3990 return; 3991 } 3992 onInitializeAccessibilityEvent(event); 3993 // Only a subset of accessibility events populates text content. 3994 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 3995 dispatchPopulateAccessibilityEvent(event); 3996 } 3997 // In the beginning we called #isShown(), so we know that getParent() is not null. 3998 getParent().requestSendAccessibilityEvent(this, event); 3999 } 4000 4001 /** 4002 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4003 * to its children for adding their text content to the event. Note that the 4004 * event text is populated in a separate dispatch path since we add to the 4005 * event not only the text of the source but also the text of all its descendants. 4006 * A typical implementation will call 4007 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4008 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4009 * on each child. Override this method if custom population of the event text 4010 * content is required. 4011 * <p> 4012 * If an {@link AccessibilityDelegate} has been specified via calling 4013 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4014 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4015 * is responsible for handling this call. 4016 * </p> 4017 * <p> 4018 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4019 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4020 * </p> 4021 * 4022 * @param event The event. 4023 * 4024 * @return True if the event population was completed. 4025 */ 4026 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4027 if (mAccessibilityDelegate != null) { 4028 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4029 } else { 4030 return dispatchPopulateAccessibilityEventInternal(event); 4031 } 4032 } 4033 4034 /** 4035 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4036 * 4037 * Note: Called from the default {@link AccessibilityDelegate}. 4038 */ 4039 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4040 onPopulateAccessibilityEvent(event); 4041 return false; 4042 } 4043 4044 /** 4045 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4046 * giving a chance to this View to populate the accessibility event with its 4047 * text content. While this method is free to modify event 4048 * attributes other than text content, doing so should normally be performed in 4049 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4050 * <p> 4051 * Example: Adding formatted date string to an accessibility event in addition 4052 * to the text added by the super implementation: 4053 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4054 * super.onPopulateAccessibilityEvent(event); 4055 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4056 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4057 * mCurrentDate.getTimeInMillis(), flags); 4058 * event.getText().add(selectedDateUtterance); 4059 * }</pre> 4060 * <p> 4061 * If an {@link AccessibilityDelegate} has been specified via calling 4062 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4063 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4064 * is responsible for handling this call. 4065 * </p> 4066 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4067 * information to the event, in case the default implementation has basic information to add. 4068 * </p> 4069 * 4070 * @param event The accessibility event which to populate. 4071 * 4072 * @see #sendAccessibilityEvent(int) 4073 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4074 */ 4075 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4076 if (mAccessibilityDelegate != null) { 4077 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4078 } else { 4079 onPopulateAccessibilityEventInternal(event); 4080 } 4081 } 4082 4083 /** 4084 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4085 * 4086 * Note: Called from the default {@link AccessibilityDelegate}. 4087 */ 4088 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4089 4090 } 4091 4092 /** 4093 * Initializes an {@link AccessibilityEvent} with information about 4094 * this View which is the event source. In other words, the source of 4095 * an accessibility event is the view whose state change triggered firing 4096 * the event. 4097 * <p> 4098 * Example: Setting the password property of an event in addition 4099 * to properties set by the super implementation: 4100 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4101 * super.onInitializeAccessibilityEvent(event); 4102 * event.setPassword(true); 4103 * }</pre> 4104 * <p> 4105 * If an {@link AccessibilityDelegate} has been specified via calling 4106 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4107 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4108 * is responsible for handling this call. 4109 * </p> 4110 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4111 * information to the event, in case the default implementation has basic information to add. 4112 * </p> 4113 * @param event The event to initialize. 4114 * 4115 * @see #sendAccessibilityEvent(int) 4116 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4117 */ 4118 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4119 if (mAccessibilityDelegate != null) { 4120 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4121 } else { 4122 onInitializeAccessibilityEventInternal(event); 4123 } 4124 } 4125 4126 /** 4127 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4128 * 4129 * Note: Called from the default {@link AccessibilityDelegate}. 4130 */ 4131 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4132 event.setSource(this); 4133 event.setClassName(View.class.getName()); 4134 event.setPackageName(getContext().getPackageName()); 4135 event.setEnabled(isEnabled()); 4136 event.setContentDescription(mContentDescription); 4137 4138 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4139 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 4140 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4141 FOCUSABLES_ALL); 4142 event.setItemCount(focusablesTempList.size()); 4143 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4144 focusablesTempList.clear(); 4145 } 4146 } 4147 4148 /** 4149 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4150 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4151 * This method is responsible for obtaining an accessibility node info from a 4152 * pool of reusable instances and calling 4153 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4154 * initialize the former. 4155 * <p> 4156 * Note: The client is responsible for recycling the obtained instance by calling 4157 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4158 * </p> 4159 * 4160 * @return A populated {@link AccessibilityNodeInfo}. 4161 * 4162 * @see AccessibilityNodeInfo 4163 */ 4164 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4165 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4166 if (provider != null) { 4167 return provider.createAccessibilityNodeInfo(View.NO_ID); 4168 } else { 4169 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4170 onInitializeAccessibilityNodeInfo(info); 4171 return info; 4172 } 4173 } 4174 4175 /** 4176 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4177 * The base implementation sets: 4178 * <ul> 4179 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4180 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4181 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4182 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4183 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4184 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4185 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4186 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4187 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4188 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4189 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4190 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4191 * </ul> 4192 * <p> 4193 * Subclasses should override this method, call the super implementation, 4194 * and set additional attributes. 4195 * </p> 4196 * <p> 4197 * If an {@link AccessibilityDelegate} has been specified via calling 4198 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4199 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4200 * is responsible for handling this call. 4201 * </p> 4202 * 4203 * @param info The instance to initialize. 4204 */ 4205 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4206 if (mAccessibilityDelegate != null) { 4207 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4208 } else { 4209 onInitializeAccessibilityNodeInfoInternal(info); 4210 } 4211 } 4212 4213 /** 4214 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4215 * 4216 * Note: Called from the default {@link AccessibilityDelegate}. 4217 */ 4218 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4219 Rect bounds = mAttachInfo.mTmpInvalRect; 4220 getDrawingRect(bounds); 4221 info.setBoundsInParent(bounds); 4222 4223 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 4224 getLocationOnScreen(locationOnScreen); 4225 bounds.offsetTo(0, 0); 4226 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 4227 info.setBoundsInScreen(bounds); 4228 4229 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4230 ViewParent parent = getParent(); 4231 if (parent instanceof View) { 4232 View parentView = (View) parent; 4233 info.setParent(parentView); 4234 } 4235 } 4236 4237 info.setPackageName(mContext.getPackageName()); 4238 info.setClassName(View.class.getName()); 4239 info.setContentDescription(getContentDescription()); 4240 4241 info.setEnabled(isEnabled()); 4242 info.setClickable(isClickable()); 4243 info.setFocusable(isFocusable()); 4244 info.setFocused(isFocused()); 4245 info.setSelected(isSelected()); 4246 info.setLongClickable(isLongClickable()); 4247 4248 // TODO: These make sense only if we are in an AdapterView but all 4249 // views can be selected. Maybe from accessiiblity perspective 4250 // we should report as selectable view in an AdapterView. 4251 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4252 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4253 4254 if (isFocusable()) { 4255 if (isFocused()) { 4256 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4257 } else { 4258 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4259 } 4260 } 4261 } 4262 4263 /** 4264 * Sets a delegate for implementing accessibility support via compositon as 4265 * opposed to inheritance. The delegate's primary use is for implementing 4266 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4267 * 4268 * @param delegate The delegate instance. 4269 * 4270 * @see AccessibilityDelegate 4271 */ 4272 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4273 mAccessibilityDelegate = delegate; 4274 } 4275 4276 /** 4277 * Gets the provider for managing a virtual view hierarchy rooted at this View 4278 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4279 * that explore the window content. 4280 * <p> 4281 * If this method returns an instance, this instance is responsible for managing 4282 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4283 * View including the one representing the View itself. Similarly the returned 4284 * instance is responsible for performing accessibility actions on any virtual 4285 * view or the root view itself. 4286 * </p> 4287 * <p> 4288 * If an {@link AccessibilityDelegate} has been specified via calling 4289 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4290 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4291 * is responsible for handling this call. 4292 * </p> 4293 * 4294 * @return The provider. 4295 * 4296 * @see AccessibilityNodeProvider 4297 */ 4298 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4299 if (mAccessibilityDelegate != null) { 4300 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4301 } else { 4302 return null; 4303 } 4304 } 4305 4306 /** 4307 * Gets the unique identifier of this view on the screen for accessibility purposes. 4308 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4309 * 4310 * @return The view accessibility id. 4311 * 4312 * @hide 4313 */ 4314 public int getAccessibilityViewId() { 4315 if (mAccessibilityViewId == NO_ID) { 4316 mAccessibilityViewId = sNextAccessibilityViewId++; 4317 } 4318 return mAccessibilityViewId; 4319 } 4320 4321 /** 4322 * Gets the unique identifier of the window in which this View reseides. 4323 * 4324 * @return The window accessibility id. 4325 * 4326 * @hide 4327 */ 4328 public int getAccessibilityWindowId() { 4329 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4330 } 4331 4332 /** 4333 * Gets the {@link View} description. It briefly describes the view and is 4334 * primarily used for accessibility support. Set this property to enable 4335 * better accessibility support for your application. This is especially 4336 * true for views that do not have textual representation (For example, 4337 * ImageButton). 4338 * 4339 * @return The content descriptiopn. 4340 * 4341 * @attr ref android.R.styleable#View_contentDescription 4342 */ 4343 public CharSequence getContentDescription() { 4344 return mContentDescription; 4345 } 4346 4347 /** 4348 * Sets the {@link View} description. It briefly describes the view and is 4349 * primarily used for accessibility support. Set this property to enable 4350 * better accessibility support for your application. This is especially 4351 * true for views that do not have textual representation (For example, 4352 * ImageButton). 4353 * 4354 * @param contentDescription The content description. 4355 * 4356 * @attr ref android.R.styleable#View_contentDescription 4357 */ 4358 @RemotableViewMethod 4359 public void setContentDescription(CharSequence contentDescription) { 4360 mContentDescription = contentDescription; 4361 } 4362 4363 /** 4364 * Invoked whenever this view loses focus, either by losing window focus or by losing 4365 * focus within its window. This method can be used to clear any state tied to the 4366 * focus. For instance, if a button is held pressed with the trackball and the window 4367 * loses focus, this method can be used to cancel the press. 4368 * 4369 * Subclasses of View overriding this method should always call super.onFocusLost(). 4370 * 4371 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4372 * @see #onWindowFocusChanged(boolean) 4373 * 4374 * @hide pending API council approval 4375 */ 4376 protected void onFocusLost() { 4377 resetPressedState(); 4378 } 4379 4380 private void resetPressedState() { 4381 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4382 return; 4383 } 4384 4385 if (isPressed()) { 4386 setPressed(false); 4387 4388 if (!mHasPerformedLongPress) { 4389 removeLongPressCallback(); 4390 } 4391 } 4392 } 4393 4394 /** 4395 * Returns true if this view has focus 4396 * 4397 * @return True if this view has focus, false otherwise. 4398 */ 4399 @ViewDebug.ExportedProperty(category = "focus") 4400 public boolean isFocused() { 4401 return (mPrivateFlags & FOCUSED) != 0; 4402 } 4403 4404 /** 4405 * Find the view in the hierarchy rooted at this view that currently has 4406 * focus. 4407 * 4408 * @return The view that currently has focus, or null if no focused view can 4409 * be found. 4410 */ 4411 public View findFocus() { 4412 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4413 } 4414 4415 /** 4416 * Change whether this view is one of the set of scrollable containers in 4417 * its window. This will be used to determine whether the window can 4418 * resize or must pan when a soft input area is open -- scrollable 4419 * containers allow the window to use resize mode since the container 4420 * will appropriately shrink. 4421 */ 4422 public void setScrollContainer(boolean isScrollContainer) { 4423 if (isScrollContainer) { 4424 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4425 mAttachInfo.mScrollContainers.add(this); 4426 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4427 } 4428 mPrivateFlags |= SCROLL_CONTAINER; 4429 } else { 4430 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4431 mAttachInfo.mScrollContainers.remove(this); 4432 } 4433 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4434 } 4435 } 4436 4437 /** 4438 * Returns the quality of the drawing cache. 4439 * 4440 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4441 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4442 * 4443 * @see #setDrawingCacheQuality(int) 4444 * @see #setDrawingCacheEnabled(boolean) 4445 * @see #isDrawingCacheEnabled() 4446 * 4447 * @attr ref android.R.styleable#View_drawingCacheQuality 4448 */ 4449 public int getDrawingCacheQuality() { 4450 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4451 } 4452 4453 /** 4454 * Set the drawing cache quality of this view. This value is used only when the 4455 * drawing cache is enabled 4456 * 4457 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4458 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4459 * 4460 * @see #getDrawingCacheQuality() 4461 * @see #setDrawingCacheEnabled(boolean) 4462 * @see #isDrawingCacheEnabled() 4463 * 4464 * @attr ref android.R.styleable#View_drawingCacheQuality 4465 */ 4466 public void setDrawingCacheQuality(int quality) { 4467 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4468 } 4469 4470 /** 4471 * Returns whether the screen should remain on, corresponding to the current 4472 * value of {@link #KEEP_SCREEN_ON}. 4473 * 4474 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4475 * 4476 * @see #setKeepScreenOn(boolean) 4477 * 4478 * @attr ref android.R.styleable#View_keepScreenOn 4479 */ 4480 public boolean getKeepScreenOn() { 4481 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4482 } 4483 4484 /** 4485 * Controls whether the screen should remain on, modifying the 4486 * value of {@link #KEEP_SCREEN_ON}. 4487 * 4488 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4489 * 4490 * @see #getKeepScreenOn() 4491 * 4492 * @attr ref android.R.styleable#View_keepScreenOn 4493 */ 4494 public void setKeepScreenOn(boolean keepScreenOn) { 4495 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4496 } 4497 4498 /** 4499 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4500 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4501 * 4502 * @attr ref android.R.styleable#View_nextFocusLeft 4503 */ 4504 public int getNextFocusLeftId() { 4505 return mNextFocusLeftId; 4506 } 4507 4508 /** 4509 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4510 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4511 * decide automatically. 4512 * 4513 * @attr ref android.R.styleable#View_nextFocusLeft 4514 */ 4515 public void setNextFocusLeftId(int nextFocusLeftId) { 4516 mNextFocusLeftId = nextFocusLeftId; 4517 } 4518 4519 /** 4520 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4521 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4522 * 4523 * @attr ref android.R.styleable#View_nextFocusRight 4524 */ 4525 public int getNextFocusRightId() { 4526 return mNextFocusRightId; 4527 } 4528 4529 /** 4530 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4531 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4532 * decide automatically. 4533 * 4534 * @attr ref android.R.styleable#View_nextFocusRight 4535 */ 4536 public void setNextFocusRightId(int nextFocusRightId) { 4537 mNextFocusRightId = nextFocusRightId; 4538 } 4539 4540 /** 4541 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4542 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4543 * 4544 * @attr ref android.R.styleable#View_nextFocusUp 4545 */ 4546 public int getNextFocusUpId() { 4547 return mNextFocusUpId; 4548 } 4549 4550 /** 4551 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4552 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4553 * decide automatically. 4554 * 4555 * @attr ref android.R.styleable#View_nextFocusUp 4556 */ 4557 public void setNextFocusUpId(int nextFocusUpId) { 4558 mNextFocusUpId = nextFocusUpId; 4559 } 4560 4561 /** 4562 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4563 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4564 * 4565 * @attr ref android.R.styleable#View_nextFocusDown 4566 */ 4567 public int getNextFocusDownId() { 4568 return mNextFocusDownId; 4569 } 4570 4571 /** 4572 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4573 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4574 * decide automatically. 4575 * 4576 * @attr ref android.R.styleable#View_nextFocusDown 4577 */ 4578 public void setNextFocusDownId(int nextFocusDownId) { 4579 mNextFocusDownId = nextFocusDownId; 4580 } 4581 4582 /** 4583 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4584 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4585 * 4586 * @attr ref android.R.styleable#View_nextFocusForward 4587 */ 4588 public int getNextFocusForwardId() { 4589 return mNextFocusForwardId; 4590 } 4591 4592 /** 4593 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4594 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4595 * decide automatically. 4596 * 4597 * @attr ref android.R.styleable#View_nextFocusForward 4598 */ 4599 public void setNextFocusForwardId(int nextFocusForwardId) { 4600 mNextFocusForwardId = nextFocusForwardId; 4601 } 4602 4603 /** 4604 * Returns the visibility of this view and all of its ancestors 4605 * 4606 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4607 */ 4608 public boolean isShown() { 4609 View current = this; 4610 //noinspection ConstantConditions 4611 do { 4612 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4613 return false; 4614 } 4615 ViewParent parent = current.mParent; 4616 if (parent == null) { 4617 return false; // We are not attached to the view root 4618 } 4619 if (!(parent instanceof View)) { 4620 return true; 4621 } 4622 current = (View) parent; 4623 } while (current != null); 4624 4625 return false; 4626 } 4627 4628 /** 4629 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4630 * is set 4631 * 4632 * @param insets Insets for system windows 4633 * 4634 * @return True if this view applied the insets, false otherwise 4635 */ 4636 protected boolean fitSystemWindows(Rect insets) { 4637 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4638 mPaddingLeft = insets.left; 4639 mPaddingTop = insets.top; 4640 mPaddingRight = insets.right; 4641 mPaddingBottom = insets.bottom; 4642 requestLayout(); 4643 return true; 4644 } 4645 return false; 4646 } 4647 4648 /** 4649 * Set whether or not this view should account for system screen decorations 4650 * such as the status bar and inset its content. This allows this view to be 4651 * positioned in absolute screen coordinates and remain visible to the user. 4652 * 4653 * <p>This should only be used by top-level window decor views. 4654 * 4655 * @param fitSystemWindows true to inset content for system screen decorations, false for 4656 * default behavior. 4657 * 4658 * @attr ref android.R.styleable#View_fitsSystemWindows 4659 */ 4660 public void setFitsSystemWindows(boolean fitSystemWindows) { 4661 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 4662 } 4663 4664 /** 4665 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 4666 * will account for system screen decorations such as the status bar and inset its 4667 * content. This allows the view to be positioned in absolute screen coordinates 4668 * and remain visible to the user. 4669 * 4670 * @return true if this view will adjust its content bounds for system screen decorations. 4671 * 4672 * @attr ref android.R.styleable#View_fitsSystemWindows 4673 */ 4674 public boolean fitsSystemWindows() { 4675 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 4676 } 4677 4678 /** 4679 * Returns the visibility status for this view. 4680 * 4681 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4682 * @attr ref android.R.styleable#View_visibility 4683 */ 4684 @ViewDebug.ExportedProperty(mapping = { 4685 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4686 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4687 @ViewDebug.IntToString(from = GONE, to = "GONE") 4688 }) 4689 public int getVisibility() { 4690 return mViewFlags & VISIBILITY_MASK; 4691 } 4692 4693 /** 4694 * Set the enabled state of this view. 4695 * 4696 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4697 * @attr ref android.R.styleable#View_visibility 4698 */ 4699 @RemotableViewMethod 4700 public void setVisibility(int visibility) { 4701 setFlags(visibility, VISIBILITY_MASK); 4702 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4703 } 4704 4705 /** 4706 * Returns the enabled status for this view. The interpretation of the 4707 * enabled state varies by subclass. 4708 * 4709 * @return True if this view is enabled, false otherwise. 4710 */ 4711 @ViewDebug.ExportedProperty 4712 public boolean isEnabled() { 4713 return (mViewFlags & ENABLED_MASK) == ENABLED; 4714 } 4715 4716 /** 4717 * Set the enabled state of this view. The interpretation of the enabled 4718 * state varies by subclass. 4719 * 4720 * @param enabled True if this view is enabled, false otherwise. 4721 */ 4722 @RemotableViewMethod 4723 public void setEnabled(boolean enabled) { 4724 if (enabled == isEnabled()) return; 4725 4726 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4727 4728 /* 4729 * The View most likely has to change its appearance, so refresh 4730 * the drawable state. 4731 */ 4732 refreshDrawableState(); 4733 4734 // Invalidate too, since the default behavior for views is to be 4735 // be drawn at 50% alpha rather than to change the drawable. 4736 invalidate(true); 4737 } 4738 4739 /** 4740 * Set whether this view can receive the focus. 4741 * 4742 * Setting this to false will also ensure that this view is not focusable 4743 * in touch mode. 4744 * 4745 * @param focusable If true, this view can receive the focus. 4746 * 4747 * @see #setFocusableInTouchMode(boolean) 4748 * @attr ref android.R.styleable#View_focusable 4749 */ 4750 public void setFocusable(boolean focusable) { 4751 if (!focusable) { 4752 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4753 } 4754 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4755 } 4756 4757 /** 4758 * Set whether this view can receive focus while in touch mode. 4759 * 4760 * Setting this to true will also ensure that this view is focusable. 4761 * 4762 * @param focusableInTouchMode If true, this view can receive the focus while 4763 * in touch mode. 4764 * 4765 * @see #setFocusable(boolean) 4766 * @attr ref android.R.styleable#View_focusableInTouchMode 4767 */ 4768 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4769 // Focusable in touch mode should always be set before the focusable flag 4770 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4771 // which, in touch mode, will not successfully request focus on this view 4772 // because the focusable in touch mode flag is not set 4773 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4774 if (focusableInTouchMode) { 4775 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4776 } 4777 } 4778 4779 /** 4780 * Set whether this view should have sound effects enabled for events such as 4781 * clicking and touching. 4782 * 4783 * <p>You may wish to disable sound effects for a view if you already play sounds, 4784 * for instance, a dial key that plays dtmf tones. 4785 * 4786 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4787 * @see #isSoundEffectsEnabled() 4788 * @see #playSoundEffect(int) 4789 * @attr ref android.R.styleable#View_soundEffectsEnabled 4790 */ 4791 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4792 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4793 } 4794 4795 /** 4796 * @return whether this view should have sound effects enabled for events such as 4797 * clicking and touching. 4798 * 4799 * @see #setSoundEffectsEnabled(boolean) 4800 * @see #playSoundEffect(int) 4801 * @attr ref android.R.styleable#View_soundEffectsEnabled 4802 */ 4803 @ViewDebug.ExportedProperty 4804 public boolean isSoundEffectsEnabled() { 4805 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4806 } 4807 4808 /** 4809 * Set whether this view should have haptic feedback for events such as 4810 * long presses. 4811 * 4812 * <p>You may wish to disable haptic feedback if your view already controls 4813 * its own haptic feedback. 4814 * 4815 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4816 * @see #isHapticFeedbackEnabled() 4817 * @see #performHapticFeedback(int) 4818 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4819 */ 4820 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4821 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4822 } 4823 4824 /** 4825 * @return whether this view should have haptic feedback enabled for events 4826 * long presses. 4827 * 4828 * @see #setHapticFeedbackEnabled(boolean) 4829 * @see #performHapticFeedback(int) 4830 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4831 */ 4832 @ViewDebug.ExportedProperty 4833 public boolean isHapticFeedbackEnabled() { 4834 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4835 } 4836 4837 /** 4838 * Returns the layout direction for this view. 4839 * 4840 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4841 * {@link #LAYOUT_DIRECTION_RTL}, 4842 * {@link #LAYOUT_DIRECTION_INHERIT} or 4843 * {@link #LAYOUT_DIRECTION_LOCALE}. 4844 * @attr ref android.R.styleable#View_layoutDirection 4845 * 4846 * @hide 4847 */ 4848 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4849 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4850 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4851 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4852 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4853 }) 4854 public int getLayoutDirection() { 4855 return mViewFlags & LAYOUT_DIRECTION_MASK; 4856 } 4857 4858 /** 4859 * Set the layout direction for this view. This will propagate a reset of layout direction 4860 * resolution to the view's children and resolve layout direction for this view. 4861 * 4862 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4863 * {@link #LAYOUT_DIRECTION_RTL}, 4864 * {@link #LAYOUT_DIRECTION_INHERIT} or 4865 * {@link #LAYOUT_DIRECTION_LOCALE}. 4866 * 4867 * @attr ref android.R.styleable#View_layoutDirection 4868 * 4869 * @hide 4870 */ 4871 @RemotableViewMethod 4872 public void setLayoutDirection(int layoutDirection) { 4873 if (getLayoutDirection() != layoutDirection) { 4874 resetResolvedLayoutDirection(); 4875 // Setting the flag will also request a layout. 4876 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4877 } 4878 } 4879 4880 /** 4881 * Returns the resolved layout direction for this view. 4882 * 4883 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4884 * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL. 4885 * 4886 * @hide 4887 */ 4888 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4889 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4890 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4891 }) 4892 public int getResolvedLayoutDirection() { 4893 resolveLayoutDirectionIfNeeded(); 4894 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 4895 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4896 } 4897 4898 /** 4899 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 4900 * layout attribute and/or the inherited value from the parent.</p> 4901 * 4902 * @return true if the layout is right-to-left. 4903 * 4904 * @hide 4905 */ 4906 @ViewDebug.ExportedProperty(category = "layout") 4907 public boolean isLayoutRtl() { 4908 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4909 } 4910 4911 /** 4912 * If this view doesn't do any drawing on its own, set this flag to 4913 * allow further optimizations. By default, this flag is not set on 4914 * View, but could be set on some View subclasses such as ViewGroup. 4915 * 4916 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4917 * you should clear this flag. 4918 * 4919 * @param willNotDraw whether or not this View draw on its own 4920 */ 4921 public void setWillNotDraw(boolean willNotDraw) { 4922 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4923 } 4924 4925 /** 4926 * Returns whether or not this View draws on its own. 4927 * 4928 * @return true if this view has nothing to draw, false otherwise 4929 */ 4930 @ViewDebug.ExportedProperty(category = "drawing") 4931 public boolean willNotDraw() { 4932 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4933 } 4934 4935 /** 4936 * When a View's drawing cache is enabled, drawing is redirected to an 4937 * offscreen bitmap. Some views, like an ImageView, must be able to 4938 * bypass this mechanism if they already draw a single bitmap, to avoid 4939 * unnecessary usage of the memory. 4940 * 4941 * @param willNotCacheDrawing true if this view does not cache its 4942 * drawing, false otherwise 4943 */ 4944 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 4945 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 4946 } 4947 4948 /** 4949 * Returns whether or not this View can cache its drawing or not. 4950 * 4951 * @return true if this view does not cache its drawing, false otherwise 4952 */ 4953 @ViewDebug.ExportedProperty(category = "drawing") 4954 public boolean willNotCacheDrawing() { 4955 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 4956 } 4957 4958 /** 4959 * Indicates whether this view reacts to click events or not. 4960 * 4961 * @return true if the view is clickable, false otherwise 4962 * 4963 * @see #setClickable(boolean) 4964 * @attr ref android.R.styleable#View_clickable 4965 */ 4966 @ViewDebug.ExportedProperty 4967 public boolean isClickable() { 4968 return (mViewFlags & CLICKABLE) == CLICKABLE; 4969 } 4970 4971 /** 4972 * Enables or disables click events for this view. When a view 4973 * is clickable it will change its state to "pressed" on every click. 4974 * Subclasses should set the view clickable to visually react to 4975 * user's clicks. 4976 * 4977 * @param clickable true to make the view clickable, false otherwise 4978 * 4979 * @see #isClickable() 4980 * @attr ref android.R.styleable#View_clickable 4981 */ 4982 public void setClickable(boolean clickable) { 4983 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 4984 } 4985 4986 /** 4987 * Indicates whether this view reacts to long click events or not. 4988 * 4989 * @return true if the view is long clickable, false otherwise 4990 * 4991 * @see #setLongClickable(boolean) 4992 * @attr ref android.R.styleable#View_longClickable 4993 */ 4994 public boolean isLongClickable() { 4995 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4996 } 4997 4998 /** 4999 * Enables or disables long click events for this view. When a view is long 5000 * clickable it reacts to the user holding down the button for a longer 5001 * duration than a tap. This event can either launch the listener or a 5002 * context menu. 5003 * 5004 * @param longClickable true to make the view long clickable, false otherwise 5005 * @see #isLongClickable() 5006 * @attr ref android.R.styleable#View_longClickable 5007 */ 5008 public void setLongClickable(boolean longClickable) { 5009 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5010 } 5011 5012 /** 5013 * Sets the pressed state for this view. 5014 * 5015 * @see #isClickable() 5016 * @see #setClickable(boolean) 5017 * 5018 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5019 * the View's internal state from a previously set "pressed" state. 5020 */ 5021 public void setPressed(boolean pressed) { 5022 if (pressed) { 5023 mPrivateFlags |= PRESSED; 5024 } else { 5025 mPrivateFlags &= ~PRESSED; 5026 } 5027 refreshDrawableState(); 5028 dispatchSetPressed(pressed); 5029 } 5030 5031 /** 5032 * Dispatch setPressed to all of this View's children. 5033 * 5034 * @see #setPressed(boolean) 5035 * 5036 * @param pressed The new pressed state 5037 */ 5038 protected void dispatchSetPressed(boolean pressed) { 5039 } 5040 5041 /** 5042 * Indicates whether the view is currently in pressed state. Unless 5043 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5044 * the pressed state. 5045 * 5046 * @see #setPressed(boolean) 5047 * @see #isClickable() 5048 * @see #setClickable(boolean) 5049 * 5050 * @return true if the view is currently pressed, false otherwise 5051 */ 5052 public boolean isPressed() { 5053 return (mPrivateFlags & PRESSED) == PRESSED; 5054 } 5055 5056 /** 5057 * Indicates whether this view will save its state (that is, 5058 * whether its {@link #onSaveInstanceState} method will be called). 5059 * 5060 * @return Returns true if the view state saving is enabled, else false. 5061 * 5062 * @see #setSaveEnabled(boolean) 5063 * @attr ref android.R.styleable#View_saveEnabled 5064 */ 5065 public boolean isSaveEnabled() { 5066 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5067 } 5068 5069 /** 5070 * Controls whether the saving of this view's state is 5071 * enabled (that is, whether its {@link #onSaveInstanceState} method 5072 * will be called). Note that even if freezing is enabled, the 5073 * view still must have an id assigned to it (via {@link #setId(int)}) 5074 * for its state to be saved. This flag can only disable the 5075 * saving of this view; any child views may still have their state saved. 5076 * 5077 * @param enabled Set to false to <em>disable</em> state saving, or true 5078 * (the default) to allow it. 5079 * 5080 * @see #isSaveEnabled() 5081 * @see #setId(int) 5082 * @see #onSaveInstanceState() 5083 * @attr ref android.R.styleable#View_saveEnabled 5084 */ 5085 public void setSaveEnabled(boolean enabled) { 5086 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5087 } 5088 5089 /** 5090 * Gets whether the framework should discard touches when the view's 5091 * window is obscured by another visible window. 5092 * Refer to the {@link View} security documentation for more details. 5093 * 5094 * @return True if touch filtering is enabled. 5095 * 5096 * @see #setFilterTouchesWhenObscured(boolean) 5097 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5098 */ 5099 @ViewDebug.ExportedProperty 5100 public boolean getFilterTouchesWhenObscured() { 5101 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5102 } 5103 5104 /** 5105 * Sets whether the framework should discard touches when the view's 5106 * window is obscured by another visible window. 5107 * Refer to the {@link View} security documentation for more details. 5108 * 5109 * @param enabled True if touch filtering should be enabled. 5110 * 5111 * @see #getFilterTouchesWhenObscured 5112 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5113 */ 5114 public void setFilterTouchesWhenObscured(boolean enabled) { 5115 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5116 FILTER_TOUCHES_WHEN_OBSCURED); 5117 } 5118 5119 /** 5120 * Indicates whether the entire hierarchy under this view will save its 5121 * state when a state saving traversal occurs from its parent. The default 5122 * is true; if false, these views will not be saved unless 5123 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5124 * 5125 * @return Returns true if the view state saving from parent is enabled, else false. 5126 * 5127 * @see #setSaveFromParentEnabled(boolean) 5128 */ 5129 public boolean isSaveFromParentEnabled() { 5130 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5131 } 5132 5133 /** 5134 * Controls whether the entire hierarchy under this view will save its 5135 * state when a state saving traversal occurs from its parent. The default 5136 * is true; if false, these views will not be saved unless 5137 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5138 * 5139 * @param enabled Set to false to <em>disable</em> state saving, or true 5140 * (the default) to allow it. 5141 * 5142 * @see #isSaveFromParentEnabled() 5143 * @see #setId(int) 5144 * @see #onSaveInstanceState() 5145 */ 5146 public void setSaveFromParentEnabled(boolean enabled) { 5147 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5148 } 5149 5150 5151 /** 5152 * Returns whether this View is able to take focus. 5153 * 5154 * @return True if this view can take focus, or false otherwise. 5155 * @attr ref android.R.styleable#View_focusable 5156 */ 5157 @ViewDebug.ExportedProperty(category = "focus") 5158 public final boolean isFocusable() { 5159 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5160 } 5161 5162 /** 5163 * When a view is focusable, it may not want to take focus when in touch mode. 5164 * For example, a button would like focus when the user is navigating via a D-pad 5165 * so that the user can click on it, but once the user starts touching the screen, 5166 * the button shouldn't take focus 5167 * @return Whether the view is focusable in touch mode. 5168 * @attr ref android.R.styleable#View_focusableInTouchMode 5169 */ 5170 @ViewDebug.ExportedProperty 5171 public final boolean isFocusableInTouchMode() { 5172 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5173 } 5174 5175 /** 5176 * Find the nearest view in the specified direction that can take focus. 5177 * This does not actually give focus to that view. 5178 * 5179 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5180 * 5181 * @return The nearest focusable in the specified direction, or null if none 5182 * can be found. 5183 */ 5184 public View focusSearch(int direction) { 5185 if (mParent != null) { 5186 return mParent.focusSearch(this, direction); 5187 } else { 5188 return null; 5189 } 5190 } 5191 5192 /** 5193 * This method is the last chance for the focused view and its ancestors to 5194 * respond to an arrow key. This is called when the focused view did not 5195 * consume the key internally, nor could the view system find a new view in 5196 * the requested direction to give focus to. 5197 * 5198 * @param focused The currently focused view. 5199 * @param direction The direction focus wants to move. One of FOCUS_UP, 5200 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5201 * @return True if the this view consumed this unhandled move. 5202 */ 5203 public boolean dispatchUnhandledMove(View focused, int direction) { 5204 return false; 5205 } 5206 5207 /** 5208 * If a user manually specified the next view id for a particular direction, 5209 * use the root to look up the view. 5210 * @param root The root view of the hierarchy containing this view. 5211 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5212 * or FOCUS_BACKWARD. 5213 * @return The user specified next view, or null if there is none. 5214 */ 5215 View findUserSetNextFocus(View root, int direction) { 5216 switch (direction) { 5217 case FOCUS_LEFT: 5218 if (mNextFocusLeftId == View.NO_ID) return null; 5219 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5220 case FOCUS_RIGHT: 5221 if (mNextFocusRightId == View.NO_ID) return null; 5222 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5223 case FOCUS_UP: 5224 if (mNextFocusUpId == View.NO_ID) return null; 5225 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5226 case FOCUS_DOWN: 5227 if (mNextFocusDownId == View.NO_ID) return null; 5228 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5229 case FOCUS_FORWARD: 5230 if (mNextFocusForwardId == View.NO_ID) return null; 5231 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5232 case FOCUS_BACKWARD: { 5233 final int id = mID; 5234 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5235 @Override 5236 public boolean apply(View t) { 5237 return t.mNextFocusForwardId == id; 5238 } 5239 }); 5240 } 5241 } 5242 return null; 5243 } 5244 5245 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5246 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5247 @Override 5248 public boolean apply(View t) { 5249 return t.mID == childViewId; 5250 } 5251 }); 5252 5253 if (result == null) { 5254 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5255 + "by user for id " + childViewId); 5256 } 5257 return result; 5258 } 5259 5260 /** 5261 * Find and return all focusable views that are descendants of this view, 5262 * possibly including this view if it is focusable itself. 5263 * 5264 * @param direction The direction of the focus 5265 * @return A list of focusable views 5266 */ 5267 public ArrayList<View> getFocusables(int direction) { 5268 ArrayList<View> result = new ArrayList<View>(24); 5269 addFocusables(result, direction); 5270 return result; 5271 } 5272 5273 /** 5274 * Add any focusable views that are descendants of this view (possibly 5275 * including this view if it is focusable itself) to views. If we are in touch mode, 5276 * only add views that are also focusable in touch mode. 5277 * 5278 * @param views Focusable views found so far 5279 * @param direction The direction of the focus 5280 */ 5281 public void addFocusables(ArrayList<View> views, int direction) { 5282 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5283 } 5284 5285 /** 5286 * Adds any focusable views that are descendants of this view (possibly 5287 * including this view if it is focusable itself) to views. This method 5288 * adds all focusable views regardless if we are in touch mode or 5289 * only views focusable in touch mode if we are in touch mode depending on 5290 * the focusable mode paramater. 5291 * 5292 * @param views Focusable views found so far or null if all we are interested is 5293 * the number of focusables. 5294 * @param direction The direction of the focus. 5295 * @param focusableMode The type of focusables to be added. 5296 * 5297 * @see #FOCUSABLES_ALL 5298 * @see #FOCUSABLES_TOUCH_MODE 5299 */ 5300 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5301 if (!isFocusable()) { 5302 return; 5303 } 5304 5305 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 5306 isInTouchMode() && !isFocusableInTouchMode()) { 5307 return; 5308 } 5309 5310 if (views != null) { 5311 views.add(this); 5312 } 5313 } 5314 5315 /** 5316 * Finds the Views that contain given text. The containment is case insensitive. 5317 * The search is performed by either the text that the View renders or the content 5318 * description that describes the view for accessibility purposes and the view does 5319 * not render or both. Clients can specify how the search is to be performed via 5320 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5321 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5322 * 5323 * @param outViews The output list of matching Views. 5324 * @param searched The text to match against. 5325 * 5326 * @see #FIND_VIEWS_WITH_TEXT 5327 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 5328 * @see #setContentDescription(CharSequence) 5329 */ 5330 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 5331 if (getAccessibilityNodeProvider() != null) { 5332 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 5333 outViews.add(this); 5334 } 5335 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 5336 && !TextUtils.isEmpty(searched) && !TextUtils.isEmpty(mContentDescription)) { 5337 String searchedLowerCase = searched.toString().toLowerCase(); 5338 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 5339 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 5340 outViews.add(this); 5341 } 5342 } 5343 } 5344 5345 /** 5346 * Find and return all touchable views that are descendants of this view, 5347 * possibly including this view if it is touchable itself. 5348 * 5349 * @return A list of touchable views 5350 */ 5351 public ArrayList<View> getTouchables() { 5352 ArrayList<View> result = new ArrayList<View>(); 5353 addTouchables(result); 5354 return result; 5355 } 5356 5357 /** 5358 * Add any touchable views that are descendants of this view (possibly 5359 * including this view if it is touchable itself) to views. 5360 * 5361 * @param views Touchable views found so far 5362 */ 5363 public void addTouchables(ArrayList<View> views) { 5364 final int viewFlags = mViewFlags; 5365 5366 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5367 && (viewFlags & ENABLED_MASK) == ENABLED) { 5368 views.add(this); 5369 } 5370 } 5371 5372 /** 5373 * Call this to try to give focus to a specific view or to one of its 5374 * descendants. 5375 * 5376 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5377 * false), or if it is focusable and it is not focusable in touch mode 5378 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5379 * 5380 * See also {@link #focusSearch(int)}, which is what you call to say that you 5381 * have focus, and you want your parent to look for the next one. 5382 * 5383 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 5384 * {@link #FOCUS_DOWN} and <code>null</code>. 5385 * 5386 * @return Whether this view or one of its descendants actually took focus. 5387 */ 5388 public final boolean requestFocus() { 5389 return requestFocus(View.FOCUS_DOWN); 5390 } 5391 5392 5393 /** 5394 * Call this to try to give focus to a specific view or to one of its 5395 * descendants and give it a hint about what direction focus is heading. 5396 * 5397 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5398 * false), or if it is focusable and it is not focusable in touch mode 5399 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5400 * 5401 * See also {@link #focusSearch(int)}, which is what you call to say that you 5402 * have focus, and you want your parent to look for the next one. 5403 * 5404 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 5405 * <code>null</code> set for the previously focused rectangle. 5406 * 5407 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5408 * @return Whether this view or one of its descendants actually took focus. 5409 */ 5410 public final boolean requestFocus(int direction) { 5411 return requestFocus(direction, null); 5412 } 5413 5414 /** 5415 * Call this to try to give focus to a specific view or to one of its descendants 5416 * and give it hints about the direction and a specific rectangle that the focus 5417 * is coming from. The rectangle can help give larger views a finer grained hint 5418 * about where focus is coming from, and therefore, where to show selection, or 5419 * forward focus change internally. 5420 * 5421 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5422 * false), or if it is focusable and it is not focusable in touch mode 5423 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5424 * 5425 * A View will not take focus if it is not visible. 5426 * 5427 * A View will not take focus if one of its parents has 5428 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 5429 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 5430 * 5431 * See also {@link #focusSearch(int)}, which is what you call to say that you 5432 * have focus, and you want your parent to look for the next one. 5433 * 5434 * You may wish to override this method if your custom {@link View} has an internal 5435 * {@link View} that it wishes to forward the request to. 5436 * 5437 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5438 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 5439 * to give a finer grained hint about where focus is coming from. May be null 5440 * if there is no hint. 5441 * @return Whether this view or one of its descendants actually took focus. 5442 */ 5443 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 5444 // need to be focusable 5445 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 5446 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5447 return false; 5448 } 5449 5450 // need to be focusable in touch mode if in touch mode 5451 if (isInTouchMode() && 5452 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 5453 return false; 5454 } 5455 5456 // need to not have any parents blocking us 5457 if (hasAncestorThatBlocksDescendantFocus()) { 5458 return false; 5459 } 5460 5461 handleFocusGainInternal(direction, previouslyFocusedRect); 5462 return true; 5463 } 5464 5465 /** Gets the ViewAncestor, or null if not attached. */ 5466 /*package*/ ViewRootImpl getViewRootImpl() { 5467 View root = getRootView(); 5468 return root != null ? (ViewRootImpl)root.getParent() : null; 5469 } 5470 5471 /** 5472 * Call this to try to give focus to a specific view or to one of its descendants. This is a 5473 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 5474 * touch mode to request focus when they are touched. 5475 * 5476 * @return Whether this view or one of its descendants actually took focus. 5477 * 5478 * @see #isInTouchMode() 5479 * 5480 */ 5481 public final boolean requestFocusFromTouch() { 5482 // Leave touch mode if we need to 5483 if (isInTouchMode()) { 5484 ViewRootImpl viewRoot = getViewRootImpl(); 5485 if (viewRoot != null) { 5486 viewRoot.ensureTouchMode(false); 5487 } 5488 } 5489 return requestFocus(View.FOCUS_DOWN); 5490 } 5491 5492 /** 5493 * @return Whether any ancestor of this view blocks descendant focus. 5494 */ 5495 private boolean hasAncestorThatBlocksDescendantFocus() { 5496 ViewParent ancestor = mParent; 5497 while (ancestor instanceof ViewGroup) { 5498 final ViewGroup vgAncestor = (ViewGroup) ancestor; 5499 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 5500 return true; 5501 } else { 5502 ancestor = vgAncestor.getParent(); 5503 } 5504 } 5505 return false; 5506 } 5507 5508 /** 5509 * @hide 5510 */ 5511 public void dispatchStartTemporaryDetach() { 5512 onStartTemporaryDetach(); 5513 } 5514 5515 /** 5516 * This is called when a container is going to temporarily detach a child, with 5517 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 5518 * It will either be followed by {@link #onFinishTemporaryDetach()} or 5519 * {@link #onDetachedFromWindow()} when the container is done. 5520 */ 5521 public void onStartTemporaryDetach() { 5522 removeUnsetPressCallback(); 5523 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 5524 } 5525 5526 /** 5527 * @hide 5528 */ 5529 public void dispatchFinishTemporaryDetach() { 5530 onFinishTemporaryDetach(); 5531 } 5532 5533 /** 5534 * Called after {@link #onStartTemporaryDetach} when the container is done 5535 * changing the view. 5536 */ 5537 public void onFinishTemporaryDetach() { 5538 } 5539 5540 /** 5541 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 5542 * for this view's window. Returns null if the view is not currently attached 5543 * to the window. Normally you will not need to use this directly, but 5544 * just use the standard high-level event callbacks like 5545 * {@link #onKeyDown(int, KeyEvent)}. 5546 */ 5547 public KeyEvent.DispatcherState getKeyDispatcherState() { 5548 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 5549 } 5550 5551 /** 5552 * Dispatch a key event before it is processed by any input method 5553 * associated with the view hierarchy. This can be used to intercept 5554 * key events in special situations before the IME consumes them; a 5555 * typical example would be handling the BACK key to update the application's 5556 * UI instead of allowing the IME to see it and close itself. 5557 * 5558 * @param event The key event to be dispatched. 5559 * @return True if the event was handled, false otherwise. 5560 */ 5561 public boolean dispatchKeyEventPreIme(KeyEvent event) { 5562 return onKeyPreIme(event.getKeyCode(), event); 5563 } 5564 5565 /** 5566 * Dispatch a key event to the next view on the focus path. This path runs 5567 * from the top of the view tree down to the currently focused view. If this 5568 * view has focus, it will dispatch to itself. Otherwise it will dispatch 5569 * the next node down the focus path. This method also fires any key 5570 * listeners. 5571 * 5572 * @param event The key event to be dispatched. 5573 * @return True if the event was handled, false otherwise. 5574 */ 5575 public boolean dispatchKeyEvent(KeyEvent event) { 5576 if (mInputEventConsistencyVerifier != null) { 5577 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 5578 } 5579 5580 // Give any attached key listener a first crack at the event. 5581 //noinspection SimplifiableIfStatement 5582 ListenerInfo li = mListenerInfo; 5583 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5584 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 5585 return true; 5586 } 5587 5588 if (event.dispatch(this, mAttachInfo != null 5589 ? mAttachInfo.mKeyDispatchState : null, this)) { 5590 return true; 5591 } 5592 5593 if (mInputEventConsistencyVerifier != null) { 5594 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5595 } 5596 return false; 5597 } 5598 5599 /** 5600 * Dispatches a key shortcut event. 5601 * 5602 * @param event The key event to be dispatched. 5603 * @return True if the event was handled by the view, false otherwise. 5604 */ 5605 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5606 return onKeyShortcut(event.getKeyCode(), event); 5607 } 5608 5609 /** 5610 * Pass the touch screen motion event down to the target view, or this 5611 * view if it is the target. 5612 * 5613 * @param event The motion event to be dispatched. 5614 * @return True if the event was handled by the view, false otherwise. 5615 */ 5616 public boolean dispatchTouchEvent(MotionEvent event) { 5617 if (mInputEventConsistencyVerifier != null) { 5618 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5619 } 5620 5621 if (onFilterTouchEventForSecurity(event)) { 5622 //noinspection SimplifiableIfStatement 5623 ListenerInfo li = mListenerInfo; 5624 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5625 && li.mOnTouchListener.onTouch(this, event)) { 5626 return true; 5627 } 5628 5629 if (onTouchEvent(event)) { 5630 return true; 5631 } 5632 } 5633 5634 if (mInputEventConsistencyVerifier != null) { 5635 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5636 } 5637 return false; 5638 } 5639 5640 /** 5641 * Filter the touch event to apply security policies. 5642 * 5643 * @param event The motion event to be filtered. 5644 * @return True if the event should be dispatched, false if the event should be dropped. 5645 * 5646 * @see #getFilterTouchesWhenObscured 5647 */ 5648 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5649 //noinspection RedundantIfStatement 5650 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5651 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5652 // Window is obscured, drop this touch. 5653 return false; 5654 } 5655 return true; 5656 } 5657 5658 /** 5659 * Pass a trackball motion event down to the focused view. 5660 * 5661 * @param event The motion event to be dispatched. 5662 * @return True if the event was handled by the view, false otherwise. 5663 */ 5664 public boolean dispatchTrackballEvent(MotionEvent event) { 5665 if (mInputEventConsistencyVerifier != null) { 5666 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5667 } 5668 5669 return onTrackballEvent(event); 5670 } 5671 5672 /** 5673 * Dispatch a generic motion event. 5674 * <p> 5675 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5676 * are delivered to the view under the pointer. All other generic motion events are 5677 * delivered to the focused view. Hover events are handled specially and are delivered 5678 * to {@link #onHoverEvent(MotionEvent)}. 5679 * </p> 5680 * 5681 * @param event The motion event to be dispatched. 5682 * @return True if the event was handled by the view, false otherwise. 5683 */ 5684 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5685 if (mInputEventConsistencyVerifier != null) { 5686 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5687 } 5688 5689 final int source = event.getSource(); 5690 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5691 final int action = event.getAction(); 5692 if (action == MotionEvent.ACTION_HOVER_ENTER 5693 || action == MotionEvent.ACTION_HOVER_MOVE 5694 || action == MotionEvent.ACTION_HOVER_EXIT) { 5695 if (dispatchHoverEvent(event)) { 5696 return true; 5697 } 5698 } else if (dispatchGenericPointerEvent(event)) { 5699 return true; 5700 } 5701 } else if (dispatchGenericFocusedEvent(event)) { 5702 return true; 5703 } 5704 5705 if (dispatchGenericMotionEventInternal(event)) { 5706 return true; 5707 } 5708 5709 if (mInputEventConsistencyVerifier != null) { 5710 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5711 } 5712 return false; 5713 } 5714 5715 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 5716 //noinspection SimplifiableIfStatement 5717 ListenerInfo li = mListenerInfo; 5718 if (li != null && li.mOnGenericMotionListener != null 5719 && (mViewFlags & ENABLED_MASK) == ENABLED 5720 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 5721 return true; 5722 } 5723 5724 if (onGenericMotionEvent(event)) { 5725 return true; 5726 } 5727 5728 if (mInputEventConsistencyVerifier != null) { 5729 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5730 } 5731 return false; 5732 } 5733 5734 /** 5735 * Dispatch a hover event. 5736 * <p> 5737 * Do not call this method directly. 5738 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5739 * </p> 5740 * 5741 * @param event The motion event to be dispatched. 5742 * @return True if the event was handled by the view, false otherwise. 5743 */ 5744 protected boolean dispatchHoverEvent(MotionEvent event) { 5745 //noinspection SimplifiableIfStatement 5746 ListenerInfo li = mListenerInfo; 5747 if (li != null && li.mOnHoverListener != null 5748 && (mViewFlags & ENABLED_MASK) == ENABLED 5749 && li.mOnHoverListener.onHover(this, event)) { 5750 return true; 5751 } 5752 5753 return onHoverEvent(event); 5754 } 5755 5756 /** 5757 * Returns true if the view has a child to which it has recently sent 5758 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 5759 * it does not have a hovered child, then it must be the innermost hovered view. 5760 * @hide 5761 */ 5762 protected boolean hasHoveredChild() { 5763 return false; 5764 } 5765 5766 /** 5767 * Dispatch a generic motion event to the view under the first pointer. 5768 * <p> 5769 * Do not call this method directly. 5770 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5771 * </p> 5772 * 5773 * @param event The motion event to be dispatched. 5774 * @return True if the event was handled by the view, false otherwise. 5775 */ 5776 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5777 return false; 5778 } 5779 5780 /** 5781 * Dispatch a generic motion event to the currently focused view. 5782 * <p> 5783 * Do not call this method directly. 5784 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5785 * </p> 5786 * 5787 * @param event The motion event to be dispatched. 5788 * @return True if the event was handled by the view, false otherwise. 5789 */ 5790 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5791 return false; 5792 } 5793 5794 /** 5795 * Dispatch a pointer event. 5796 * <p> 5797 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5798 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5799 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5800 * and should not be expected to handle other pointing device features. 5801 * </p> 5802 * 5803 * @param event The motion event to be dispatched. 5804 * @return True if the event was handled by the view, false otherwise. 5805 * @hide 5806 */ 5807 public final boolean dispatchPointerEvent(MotionEvent event) { 5808 if (event.isTouchEvent()) { 5809 return dispatchTouchEvent(event); 5810 } else { 5811 return dispatchGenericMotionEvent(event); 5812 } 5813 } 5814 5815 /** 5816 * Called when the window containing this view gains or loses window focus. 5817 * ViewGroups should override to route to their children. 5818 * 5819 * @param hasFocus True if the window containing this view now has focus, 5820 * false otherwise. 5821 */ 5822 public void dispatchWindowFocusChanged(boolean hasFocus) { 5823 onWindowFocusChanged(hasFocus); 5824 } 5825 5826 /** 5827 * Called when the window containing this view gains or loses focus. Note 5828 * that this is separate from view focus: to receive key events, both 5829 * your view and its window must have focus. If a window is displayed 5830 * on top of yours that takes input focus, then your own window will lose 5831 * focus but the view focus will remain unchanged. 5832 * 5833 * @param hasWindowFocus True if the window containing this view now has 5834 * focus, false otherwise. 5835 */ 5836 public void onWindowFocusChanged(boolean hasWindowFocus) { 5837 InputMethodManager imm = InputMethodManager.peekInstance(); 5838 if (!hasWindowFocus) { 5839 if (isPressed()) { 5840 setPressed(false); 5841 } 5842 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5843 imm.focusOut(this); 5844 } 5845 removeLongPressCallback(); 5846 removeTapCallback(); 5847 onFocusLost(); 5848 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5849 imm.focusIn(this); 5850 } 5851 refreshDrawableState(); 5852 } 5853 5854 /** 5855 * Returns true if this view is in a window that currently has window focus. 5856 * Note that this is not the same as the view itself having focus. 5857 * 5858 * @return True if this view is in a window that currently has window focus. 5859 */ 5860 public boolean hasWindowFocus() { 5861 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5862 } 5863 5864 /** 5865 * Dispatch a view visibility change down the view hierarchy. 5866 * ViewGroups should override to route to their children. 5867 * @param changedView The view whose visibility changed. Could be 'this' or 5868 * an ancestor view. 5869 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5870 * {@link #INVISIBLE} or {@link #GONE}. 5871 */ 5872 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5873 onVisibilityChanged(changedView, visibility); 5874 } 5875 5876 /** 5877 * Called when the visibility of the view or an ancestor of the view is changed. 5878 * @param changedView The view whose visibility changed. Could be 'this' or 5879 * an ancestor view. 5880 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5881 * {@link #INVISIBLE} or {@link #GONE}. 5882 */ 5883 protected void onVisibilityChanged(View changedView, int visibility) { 5884 if (visibility == VISIBLE) { 5885 if (mAttachInfo != null) { 5886 initialAwakenScrollBars(); 5887 } else { 5888 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5889 } 5890 } 5891 } 5892 5893 /** 5894 * Dispatch a hint about whether this view is displayed. For instance, when 5895 * a View moves out of the screen, it might receives a display hint indicating 5896 * the view is not displayed. Applications should not <em>rely</em> on this hint 5897 * as there is no guarantee that they will receive one. 5898 * 5899 * @param hint A hint about whether or not this view is displayed: 5900 * {@link #VISIBLE} or {@link #INVISIBLE}. 5901 */ 5902 public void dispatchDisplayHint(int hint) { 5903 onDisplayHint(hint); 5904 } 5905 5906 /** 5907 * Gives this view a hint about whether is displayed or not. For instance, when 5908 * a View moves out of the screen, it might receives a display hint indicating 5909 * the view is not displayed. Applications should not <em>rely</em> on this hint 5910 * as there is no guarantee that they will receive one. 5911 * 5912 * @param hint A hint about whether or not this view is displayed: 5913 * {@link #VISIBLE} or {@link #INVISIBLE}. 5914 */ 5915 protected void onDisplayHint(int hint) { 5916 } 5917 5918 /** 5919 * Dispatch a window visibility change down the view hierarchy. 5920 * ViewGroups should override to route to their children. 5921 * 5922 * @param visibility The new visibility of the window. 5923 * 5924 * @see #onWindowVisibilityChanged(int) 5925 */ 5926 public void dispatchWindowVisibilityChanged(int visibility) { 5927 onWindowVisibilityChanged(visibility); 5928 } 5929 5930 /** 5931 * Called when the window containing has change its visibility 5932 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5933 * that this tells you whether or not your window is being made visible 5934 * to the window manager; this does <em>not</em> tell you whether or not 5935 * your window is obscured by other windows on the screen, even if it 5936 * is itself visible. 5937 * 5938 * @param visibility The new visibility of the window. 5939 */ 5940 protected void onWindowVisibilityChanged(int visibility) { 5941 if (visibility == VISIBLE) { 5942 initialAwakenScrollBars(); 5943 } 5944 } 5945 5946 /** 5947 * Returns the current visibility of the window this view is attached to 5948 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 5949 * 5950 * @return Returns the current visibility of the view's window. 5951 */ 5952 public int getWindowVisibility() { 5953 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 5954 } 5955 5956 /** 5957 * Retrieve the overall visible display size in which the window this view is 5958 * attached to has been positioned in. This takes into account screen 5959 * decorations above the window, for both cases where the window itself 5960 * is being position inside of them or the window is being placed under 5961 * then and covered insets are used for the window to position its content 5962 * inside. In effect, this tells you the available area where content can 5963 * be placed and remain visible to users. 5964 * 5965 * <p>This function requires an IPC back to the window manager to retrieve 5966 * the requested information, so should not be used in performance critical 5967 * code like drawing. 5968 * 5969 * @param outRect Filled in with the visible display frame. If the view 5970 * is not attached to a window, this is simply the raw display size. 5971 */ 5972 public void getWindowVisibleDisplayFrame(Rect outRect) { 5973 if (mAttachInfo != null) { 5974 try { 5975 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 5976 } catch (RemoteException e) { 5977 return; 5978 } 5979 // XXX This is really broken, and probably all needs to be done 5980 // in the window manager, and we need to know more about whether 5981 // we want the area behind or in front of the IME. 5982 final Rect insets = mAttachInfo.mVisibleInsets; 5983 outRect.left += insets.left; 5984 outRect.top += insets.top; 5985 outRect.right -= insets.right; 5986 outRect.bottom -= insets.bottom; 5987 return; 5988 } 5989 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 5990 d.getRectSize(outRect); 5991 } 5992 5993 /** 5994 * Dispatch a notification about a resource configuration change down 5995 * the view hierarchy. 5996 * ViewGroups should override to route to their children. 5997 * 5998 * @param newConfig The new resource configuration. 5999 * 6000 * @see #onConfigurationChanged(android.content.res.Configuration) 6001 */ 6002 public void dispatchConfigurationChanged(Configuration newConfig) { 6003 onConfigurationChanged(newConfig); 6004 } 6005 6006 /** 6007 * Called when the current configuration of the resources being used 6008 * by the application have changed. You can use this to decide when 6009 * to reload resources that can changed based on orientation and other 6010 * configuration characterstics. You only need to use this if you are 6011 * not relying on the normal {@link android.app.Activity} mechanism of 6012 * recreating the activity instance upon a configuration change. 6013 * 6014 * @param newConfig The new resource configuration. 6015 */ 6016 protected void onConfigurationChanged(Configuration newConfig) { 6017 } 6018 6019 /** 6020 * Private function to aggregate all per-view attributes in to the view 6021 * root. 6022 */ 6023 void dispatchCollectViewAttributes(int visibility) { 6024 performCollectViewAttributes(visibility); 6025 } 6026 6027 void performCollectViewAttributes(int visibility) { 6028 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 6029 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 6030 mAttachInfo.mKeepScreenOn = true; 6031 } 6032 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 6033 ListenerInfo li = mListenerInfo; 6034 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 6035 mAttachInfo.mHasSystemUiListeners = true; 6036 } 6037 } 6038 } 6039 6040 void needGlobalAttributesUpdate(boolean force) { 6041 final AttachInfo ai = mAttachInfo; 6042 if (ai != null) { 6043 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 6044 || ai.mHasSystemUiListeners) { 6045 ai.mRecomputeGlobalAttributes = true; 6046 } 6047 } 6048 } 6049 6050 /** 6051 * Returns whether the device is currently in touch mode. Touch mode is entered 6052 * once the user begins interacting with the device by touch, and affects various 6053 * things like whether focus is always visible to the user. 6054 * 6055 * @return Whether the device is in touch mode. 6056 */ 6057 @ViewDebug.ExportedProperty 6058 public boolean isInTouchMode() { 6059 if (mAttachInfo != null) { 6060 return mAttachInfo.mInTouchMode; 6061 } else { 6062 return ViewRootImpl.isInTouchMode(); 6063 } 6064 } 6065 6066 /** 6067 * Returns the context the view is running in, through which it can 6068 * access the current theme, resources, etc. 6069 * 6070 * @return The view's Context. 6071 */ 6072 @ViewDebug.CapturedViewProperty 6073 public final Context getContext() { 6074 return mContext; 6075 } 6076 6077 /** 6078 * Handle a key event before it is processed by any input method 6079 * associated with the view hierarchy. This can be used to intercept 6080 * key events in special situations before the IME consumes them; a 6081 * typical example would be handling the BACK key to update the application's 6082 * UI instead of allowing the IME to see it and close itself. 6083 * 6084 * @param keyCode The value in event.getKeyCode(). 6085 * @param event Description of the key event. 6086 * @return If you handled the event, return true. If you want to allow the 6087 * event to be handled by the next receiver, return false. 6088 */ 6089 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 6090 return false; 6091 } 6092 6093 /** 6094 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 6095 * KeyEvent.Callback.onKeyDown()}: perform press of the view 6096 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 6097 * is released, if the view is enabled and clickable. 6098 * 6099 * @param keyCode A key code that represents the button pressed, from 6100 * {@link android.view.KeyEvent}. 6101 * @param event The KeyEvent object that defines the button action. 6102 */ 6103 public boolean onKeyDown(int keyCode, KeyEvent event) { 6104 boolean result = false; 6105 6106 switch (keyCode) { 6107 case KeyEvent.KEYCODE_DPAD_CENTER: 6108 case KeyEvent.KEYCODE_ENTER: { 6109 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6110 return true; 6111 } 6112 // Long clickable items don't necessarily have to be clickable 6113 if (((mViewFlags & CLICKABLE) == CLICKABLE || 6114 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 6115 (event.getRepeatCount() == 0)) { 6116 setPressed(true); 6117 checkForLongClick(0); 6118 return true; 6119 } 6120 break; 6121 } 6122 } 6123 return result; 6124 } 6125 6126 /** 6127 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 6128 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 6129 * the event). 6130 */ 6131 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 6132 return false; 6133 } 6134 6135 /** 6136 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 6137 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 6138 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 6139 * {@link KeyEvent#KEYCODE_ENTER} is released. 6140 * 6141 * @param keyCode A key code that represents the button pressed, from 6142 * {@link android.view.KeyEvent}. 6143 * @param event The KeyEvent object that defines the button action. 6144 */ 6145 public boolean onKeyUp(int keyCode, KeyEvent event) { 6146 boolean result = false; 6147 6148 switch (keyCode) { 6149 case KeyEvent.KEYCODE_DPAD_CENTER: 6150 case KeyEvent.KEYCODE_ENTER: { 6151 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6152 return true; 6153 } 6154 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 6155 setPressed(false); 6156 6157 if (!mHasPerformedLongPress) { 6158 // This is a tap, so remove the longpress check 6159 removeLongPressCallback(); 6160 6161 result = performClick(); 6162 } 6163 } 6164 break; 6165 } 6166 } 6167 return result; 6168 } 6169 6170 /** 6171 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 6172 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 6173 * the event). 6174 * 6175 * @param keyCode A key code that represents the button pressed, from 6176 * {@link android.view.KeyEvent}. 6177 * @param repeatCount The number of times the action was made. 6178 * @param event The KeyEvent object that defines the button action. 6179 */ 6180 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 6181 return false; 6182 } 6183 6184 /** 6185 * Called on the focused view when a key shortcut event is not handled. 6186 * Override this method to implement local key shortcuts for the View. 6187 * Key shortcuts can also be implemented by setting the 6188 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 6189 * 6190 * @param keyCode The value in event.getKeyCode(). 6191 * @param event Description of the key event. 6192 * @return If you handled the event, return true. If you want to allow the 6193 * event to be handled by the next receiver, return false. 6194 */ 6195 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 6196 return false; 6197 } 6198 6199 /** 6200 * Check whether the called view is a text editor, in which case it 6201 * would make sense to automatically display a soft input window for 6202 * it. Subclasses should override this if they implement 6203 * {@link #onCreateInputConnection(EditorInfo)} to return true if 6204 * a call on that method would return a non-null InputConnection, and 6205 * they are really a first-class editor that the user would normally 6206 * start typing on when the go into a window containing your view. 6207 * 6208 * <p>The default implementation always returns false. This does 6209 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 6210 * will not be called or the user can not otherwise perform edits on your 6211 * view; it is just a hint to the system that this is not the primary 6212 * purpose of this view. 6213 * 6214 * @return Returns true if this view is a text editor, else false. 6215 */ 6216 public boolean onCheckIsTextEditor() { 6217 return false; 6218 } 6219 6220 /** 6221 * Create a new InputConnection for an InputMethod to interact 6222 * with the view. The default implementation returns null, since it doesn't 6223 * support input methods. You can override this to implement such support. 6224 * This is only needed for views that take focus and text input. 6225 * 6226 * <p>When implementing this, you probably also want to implement 6227 * {@link #onCheckIsTextEditor()} to indicate you will return a 6228 * non-null InputConnection. 6229 * 6230 * @param outAttrs Fill in with attribute information about the connection. 6231 */ 6232 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 6233 return null; 6234 } 6235 6236 /** 6237 * Called by the {@link android.view.inputmethod.InputMethodManager} 6238 * when a view who is not the current 6239 * input connection target is trying to make a call on the manager. The 6240 * default implementation returns false; you can override this to return 6241 * true for certain views if you are performing InputConnection proxying 6242 * to them. 6243 * @param view The View that is making the InputMethodManager call. 6244 * @return Return true to allow the call, false to reject. 6245 */ 6246 public boolean checkInputConnectionProxy(View view) { 6247 return false; 6248 } 6249 6250 /** 6251 * Show the context menu for this view. It is not safe to hold on to the 6252 * menu after returning from this method. 6253 * 6254 * You should normally not overload this method. Overload 6255 * {@link #onCreateContextMenu(ContextMenu)} or define an 6256 * {@link OnCreateContextMenuListener} to add items to the context menu. 6257 * 6258 * @param menu The context menu to populate 6259 */ 6260 public void createContextMenu(ContextMenu menu) { 6261 ContextMenuInfo menuInfo = getContextMenuInfo(); 6262 6263 // Sets the current menu info so all items added to menu will have 6264 // my extra info set. 6265 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 6266 6267 onCreateContextMenu(menu); 6268 ListenerInfo li = mListenerInfo; 6269 if (li != null && li.mOnCreateContextMenuListener != null) { 6270 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 6271 } 6272 6273 // Clear the extra information so subsequent items that aren't mine don't 6274 // have my extra info. 6275 ((MenuBuilder)menu).setCurrentMenuInfo(null); 6276 6277 if (mParent != null) { 6278 mParent.createContextMenu(menu); 6279 } 6280 } 6281 6282 /** 6283 * Views should implement this if they have extra information to associate 6284 * with the context menu. The return result is supplied as a parameter to 6285 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 6286 * callback. 6287 * 6288 * @return Extra information about the item for which the context menu 6289 * should be shown. This information will vary across different 6290 * subclasses of View. 6291 */ 6292 protected ContextMenuInfo getContextMenuInfo() { 6293 return null; 6294 } 6295 6296 /** 6297 * Views should implement this if the view itself is going to add items to 6298 * the context menu. 6299 * 6300 * @param menu the context menu to populate 6301 */ 6302 protected void onCreateContextMenu(ContextMenu menu) { 6303 } 6304 6305 /** 6306 * Implement this method to handle trackball motion events. The 6307 * <em>relative</em> movement of the trackball since the last event 6308 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 6309 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 6310 * that a movement of 1 corresponds to the user pressing one DPAD key (so 6311 * they will often be fractional values, representing the more fine-grained 6312 * movement information available from a trackball). 6313 * 6314 * @param event The motion event. 6315 * @return True if the event was handled, false otherwise. 6316 */ 6317 public boolean onTrackballEvent(MotionEvent event) { 6318 return false; 6319 } 6320 6321 /** 6322 * Implement this method to handle generic motion events. 6323 * <p> 6324 * Generic motion events describe joystick movements, mouse hovers, track pad 6325 * touches, scroll wheel movements and other input events. The 6326 * {@link MotionEvent#getSource() source} of the motion event specifies 6327 * the class of input that was received. Implementations of this method 6328 * must examine the bits in the source before processing the event. 6329 * The following code example shows how this is done. 6330 * </p><p> 6331 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6332 * are delivered to the view under the pointer. All other generic motion events are 6333 * delivered to the focused view. 6334 * </p> 6335 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 6336 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 6337 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 6338 * // process the joystick movement... 6339 * return true; 6340 * } 6341 * } 6342 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6343 * switch (event.getAction()) { 6344 * case MotionEvent.ACTION_HOVER_MOVE: 6345 * // process the mouse hover movement... 6346 * return true; 6347 * case MotionEvent.ACTION_SCROLL: 6348 * // process the scroll wheel movement... 6349 * return true; 6350 * } 6351 * } 6352 * return super.onGenericMotionEvent(event); 6353 * }</pre> 6354 * 6355 * @param event The generic motion event being processed. 6356 * @return True if the event was handled, false otherwise. 6357 */ 6358 public boolean onGenericMotionEvent(MotionEvent event) { 6359 return false; 6360 } 6361 6362 /** 6363 * Implement this method to handle hover events. 6364 * <p> 6365 * This method is called whenever a pointer is hovering into, over, or out of the 6366 * bounds of a view and the view is not currently being touched. 6367 * Hover events are represented as pointer events with action 6368 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 6369 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 6370 * </p> 6371 * <ul> 6372 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 6373 * when the pointer enters the bounds of the view.</li> 6374 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 6375 * when the pointer has already entered the bounds of the view and has moved.</li> 6376 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 6377 * when the pointer has exited the bounds of the view or when the pointer is 6378 * about to go down due to a button click, tap, or similar user action that 6379 * causes the view to be touched.</li> 6380 * </ul> 6381 * <p> 6382 * The view should implement this method to return true to indicate that it is 6383 * handling the hover event, such as by changing its drawable state. 6384 * </p><p> 6385 * The default implementation calls {@link #setHovered} to update the hovered state 6386 * of the view when a hover enter or hover exit event is received, if the view 6387 * is enabled and is clickable. The default implementation also sends hover 6388 * accessibility events. 6389 * </p> 6390 * 6391 * @param event The motion event that describes the hover. 6392 * @return True if the view handled the hover event. 6393 * 6394 * @see #isHovered 6395 * @see #setHovered 6396 * @see #onHoverChanged 6397 */ 6398 public boolean onHoverEvent(MotionEvent event) { 6399 // The root view may receive hover (or touch) events that are outside the bounds of 6400 // the window. This code ensures that we only send accessibility events for 6401 // hovers that are actually within the bounds of the root view. 6402 final int action = event.getAction(); 6403 if (!mSendingHoverAccessibilityEvents) { 6404 if ((action == MotionEvent.ACTION_HOVER_ENTER 6405 || action == MotionEvent.ACTION_HOVER_MOVE) 6406 && !hasHoveredChild() 6407 && pointInView(event.getX(), event.getY())) { 6408 mSendingHoverAccessibilityEvents = true; 6409 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 6410 } 6411 } else { 6412 if (action == MotionEvent.ACTION_HOVER_EXIT 6413 || (action == MotionEvent.ACTION_HOVER_MOVE 6414 && !pointInView(event.getX(), event.getY()))) { 6415 mSendingHoverAccessibilityEvents = false; 6416 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 6417 } 6418 } 6419 6420 if (isHoverable()) { 6421 switch (action) { 6422 case MotionEvent.ACTION_HOVER_ENTER: 6423 setHovered(true); 6424 break; 6425 case MotionEvent.ACTION_HOVER_EXIT: 6426 setHovered(false); 6427 break; 6428 } 6429 6430 // Dispatch the event to onGenericMotionEvent before returning true. 6431 // This is to provide compatibility with existing applications that 6432 // handled HOVER_MOVE events in onGenericMotionEvent and that would 6433 // break because of the new default handling for hoverable views 6434 // in onHoverEvent. 6435 // Note that onGenericMotionEvent will be called by default when 6436 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 6437 dispatchGenericMotionEventInternal(event); 6438 return true; 6439 } 6440 return false; 6441 } 6442 6443 /** 6444 * Returns true if the view should handle {@link #onHoverEvent} 6445 * by calling {@link #setHovered} to change its hovered state. 6446 * 6447 * @return True if the view is hoverable. 6448 */ 6449 private boolean isHoverable() { 6450 final int viewFlags = mViewFlags; 6451 //noinspection SimplifiableIfStatement 6452 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6453 return false; 6454 } 6455 6456 return (viewFlags & CLICKABLE) == CLICKABLE 6457 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6458 } 6459 6460 /** 6461 * Returns true if the view is currently hovered. 6462 * 6463 * @return True if the view is currently hovered. 6464 * 6465 * @see #setHovered 6466 * @see #onHoverChanged 6467 */ 6468 @ViewDebug.ExportedProperty 6469 public boolean isHovered() { 6470 return (mPrivateFlags & HOVERED) != 0; 6471 } 6472 6473 /** 6474 * Sets whether the view is currently hovered. 6475 * <p> 6476 * Calling this method also changes the drawable state of the view. This 6477 * enables the view to react to hover by using different drawable resources 6478 * to change its appearance. 6479 * </p><p> 6480 * The {@link #onHoverChanged} method is called when the hovered state changes. 6481 * </p> 6482 * 6483 * @param hovered True if the view is hovered. 6484 * 6485 * @see #isHovered 6486 * @see #onHoverChanged 6487 */ 6488 public void setHovered(boolean hovered) { 6489 if (hovered) { 6490 if ((mPrivateFlags & HOVERED) == 0) { 6491 mPrivateFlags |= HOVERED; 6492 refreshDrawableState(); 6493 onHoverChanged(true); 6494 } 6495 } else { 6496 if ((mPrivateFlags & HOVERED) != 0) { 6497 mPrivateFlags &= ~HOVERED; 6498 refreshDrawableState(); 6499 onHoverChanged(false); 6500 } 6501 } 6502 } 6503 6504 /** 6505 * Implement this method to handle hover state changes. 6506 * <p> 6507 * This method is called whenever the hover state changes as a result of a 6508 * call to {@link #setHovered}. 6509 * </p> 6510 * 6511 * @param hovered The current hover state, as returned by {@link #isHovered}. 6512 * 6513 * @see #isHovered 6514 * @see #setHovered 6515 */ 6516 public void onHoverChanged(boolean hovered) { 6517 } 6518 6519 /** 6520 * Implement this method to handle touch screen motion events. 6521 * 6522 * @param event The motion event. 6523 * @return True if the event was handled, false otherwise. 6524 */ 6525 public boolean onTouchEvent(MotionEvent event) { 6526 final int viewFlags = mViewFlags; 6527 6528 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6529 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 6530 mPrivateFlags &= ~PRESSED; 6531 refreshDrawableState(); 6532 } 6533 // A disabled view that is clickable still consumes the touch 6534 // events, it just doesn't respond to them. 6535 return (((viewFlags & CLICKABLE) == CLICKABLE || 6536 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 6537 } 6538 6539 if (mTouchDelegate != null) { 6540 if (mTouchDelegate.onTouchEvent(event)) { 6541 return true; 6542 } 6543 } 6544 6545 if (((viewFlags & CLICKABLE) == CLICKABLE || 6546 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 6547 switch (event.getAction()) { 6548 case MotionEvent.ACTION_UP: 6549 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 6550 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 6551 // take focus if we don't have it already and we should in 6552 // touch mode. 6553 boolean focusTaken = false; 6554 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 6555 focusTaken = requestFocus(); 6556 } 6557 6558 if (prepressed) { 6559 // The button is being released before we actually 6560 // showed it as pressed. Make it show the pressed 6561 // state now (before scheduling the click) to ensure 6562 // the user sees it. 6563 mPrivateFlags |= PRESSED; 6564 refreshDrawableState(); 6565 } 6566 6567 if (!mHasPerformedLongPress) { 6568 // This is a tap, so remove the longpress check 6569 removeLongPressCallback(); 6570 6571 // Only perform take click actions if we were in the pressed state 6572 if (!focusTaken) { 6573 // Use a Runnable and post this rather than calling 6574 // performClick directly. This lets other visual state 6575 // of the view update before click actions start. 6576 if (mPerformClick == null) { 6577 mPerformClick = new PerformClick(); 6578 } 6579 if (!post(mPerformClick)) { 6580 performClick(); 6581 } 6582 } 6583 } 6584 6585 if (mUnsetPressedState == null) { 6586 mUnsetPressedState = new UnsetPressedState(); 6587 } 6588 6589 if (prepressed) { 6590 postDelayed(mUnsetPressedState, 6591 ViewConfiguration.getPressedStateDuration()); 6592 } else if (!post(mUnsetPressedState)) { 6593 // If the post failed, unpress right now 6594 mUnsetPressedState.run(); 6595 } 6596 removeTapCallback(); 6597 } 6598 break; 6599 6600 case MotionEvent.ACTION_DOWN: 6601 mHasPerformedLongPress = false; 6602 6603 if (performButtonActionOnTouchDown(event)) { 6604 break; 6605 } 6606 6607 // Walk up the hierarchy to determine if we're inside a scrolling container. 6608 boolean isInScrollingContainer = isInScrollingContainer(); 6609 6610 // For views inside a scrolling container, delay the pressed feedback for 6611 // a short period in case this is a scroll. 6612 if (isInScrollingContainer) { 6613 mPrivateFlags |= PREPRESSED; 6614 if (mPendingCheckForTap == null) { 6615 mPendingCheckForTap = new CheckForTap(); 6616 } 6617 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 6618 } else { 6619 // Not inside a scrolling container, so show the feedback right away 6620 mPrivateFlags |= PRESSED; 6621 refreshDrawableState(); 6622 checkForLongClick(0); 6623 } 6624 break; 6625 6626 case MotionEvent.ACTION_CANCEL: 6627 mPrivateFlags &= ~PRESSED; 6628 refreshDrawableState(); 6629 removeTapCallback(); 6630 break; 6631 6632 case MotionEvent.ACTION_MOVE: 6633 final int x = (int) event.getX(); 6634 final int y = (int) event.getY(); 6635 6636 // Be lenient about moving outside of buttons 6637 if (!pointInView(x, y, mTouchSlop)) { 6638 // Outside button 6639 removeTapCallback(); 6640 if ((mPrivateFlags & PRESSED) != 0) { 6641 // Remove any future long press/tap checks 6642 removeLongPressCallback(); 6643 6644 // Need to switch from pressed to not pressed 6645 mPrivateFlags &= ~PRESSED; 6646 refreshDrawableState(); 6647 } 6648 } 6649 break; 6650 } 6651 return true; 6652 } 6653 6654 return false; 6655 } 6656 6657 /** 6658 * @hide 6659 */ 6660 public boolean isInScrollingContainer() { 6661 ViewParent p = getParent(); 6662 while (p != null && p instanceof ViewGroup) { 6663 if (((ViewGroup) p).shouldDelayChildPressedState()) { 6664 return true; 6665 } 6666 p = p.getParent(); 6667 } 6668 return false; 6669 } 6670 6671 /** 6672 * Remove the longpress detection timer. 6673 */ 6674 private void removeLongPressCallback() { 6675 if (mPendingCheckForLongPress != null) { 6676 removeCallbacks(mPendingCheckForLongPress); 6677 } 6678 } 6679 6680 /** 6681 * Remove the pending click action 6682 */ 6683 private void removePerformClickCallback() { 6684 if (mPerformClick != null) { 6685 removeCallbacks(mPerformClick); 6686 } 6687 } 6688 6689 /** 6690 * Remove the prepress detection timer. 6691 */ 6692 private void removeUnsetPressCallback() { 6693 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 6694 setPressed(false); 6695 removeCallbacks(mUnsetPressedState); 6696 } 6697 } 6698 6699 /** 6700 * Remove the tap detection timer. 6701 */ 6702 private void removeTapCallback() { 6703 if (mPendingCheckForTap != null) { 6704 mPrivateFlags &= ~PREPRESSED; 6705 removeCallbacks(mPendingCheckForTap); 6706 } 6707 } 6708 6709 /** 6710 * Cancels a pending long press. Your subclass can use this if you 6711 * want the context menu to come up if the user presses and holds 6712 * at the same place, but you don't want it to come up if they press 6713 * and then move around enough to cause scrolling. 6714 */ 6715 public void cancelLongPress() { 6716 removeLongPressCallback(); 6717 6718 /* 6719 * The prepressed state handled by the tap callback is a display 6720 * construct, but the tap callback will post a long press callback 6721 * less its own timeout. Remove it here. 6722 */ 6723 removeTapCallback(); 6724 } 6725 6726 /** 6727 * Remove the pending callback for sending a 6728 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 6729 */ 6730 private void removeSendViewScrolledAccessibilityEventCallback() { 6731 if (mSendViewScrolledAccessibilityEvent != null) { 6732 removeCallbacks(mSendViewScrolledAccessibilityEvent); 6733 } 6734 } 6735 6736 /** 6737 * Sets the TouchDelegate for this View. 6738 */ 6739 public void setTouchDelegate(TouchDelegate delegate) { 6740 mTouchDelegate = delegate; 6741 } 6742 6743 /** 6744 * Gets the TouchDelegate for this View. 6745 */ 6746 public TouchDelegate getTouchDelegate() { 6747 return mTouchDelegate; 6748 } 6749 6750 /** 6751 * Set flags controlling behavior of this view. 6752 * 6753 * @param flags Constant indicating the value which should be set 6754 * @param mask Constant indicating the bit range that should be changed 6755 */ 6756 void setFlags(int flags, int mask) { 6757 int old = mViewFlags; 6758 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6759 6760 int changed = mViewFlags ^ old; 6761 if (changed == 0) { 6762 return; 6763 } 6764 int privateFlags = mPrivateFlags; 6765 6766 /* Check if the FOCUSABLE bit has changed */ 6767 if (((changed & FOCUSABLE_MASK) != 0) && 6768 ((privateFlags & HAS_BOUNDS) !=0)) { 6769 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6770 && ((privateFlags & FOCUSED) != 0)) { 6771 /* Give up focus if we are no longer focusable */ 6772 clearFocus(); 6773 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6774 && ((privateFlags & FOCUSED) == 0)) { 6775 /* 6776 * Tell the view system that we are now available to take focus 6777 * if no one else already has it. 6778 */ 6779 if (mParent != null) mParent.focusableViewAvailable(this); 6780 } 6781 } 6782 6783 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6784 if ((changed & VISIBILITY_MASK) != 0) { 6785 /* 6786 * If this view is becoming visible, invalidate it in case it changed while 6787 * it was not visible. Marking it drawn ensures that the invalidation will 6788 * go through. 6789 */ 6790 mPrivateFlags |= DRAWN; 6791 invalidate(true); 6792 6793 needGlobalAttributesUpdate(true); 6794 6795 // a view becoming visible is worth notifying the parent 6796 // about in case nothing has focus. even if this specific view 6797 // isn't focusable, it may contain something that is, so let 6798 // the root view try to give this focus if nothing else does. 6799 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6800 mParent.focusableViewAvailable(this); 6801 } 6802 } 6803 } 6804 6805 /* Check if the GONE bit has changed */ 6806 if ((changed & GONE) != 0) { 6807 needGlobalAttributesUpdate(false); 6808 requestLayout(); 6809 6810 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6811 if (hasFocus()) clearFocus(); 6812 destroyDrawingCache(); 6813 if (mParent instanceof View) { 6814 // GONE views noop invalidation, so invalidate the parent 6815 ((View) mParent).invalidate(true); 6816 } 6817 // Mark the view drawn to ensure that it gets invalidated properly the next 6818 // time it is visible and gets invalidated 6819 mPrivateFlags |= DRAWN; 6820 } 6821 if (mAttachInfo != null) { 6822 mAttachInfo.mViewVisibilityChanged = true; 6823 } 6824 } 6825 6826 /* Check if the VISIBLE bit has changed */ 6827 if ((changed & INVISIBLE) != 0) { 6828 needGlobalAttributesUpdate(false); 6829 /* 6830 * If this view is becoming invisible, set the DRAWN flag so that 6831 * the next invalidate() will not be skipped. 6832 */ 6833 mPrivateFlags |= DRAWN; 6834 6835 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6836 // root view becoming invisible shouldn't clear focus 6837 if (getRootView() != this) { 6838 clearFocus(); 6839 } 6840 } 6841 if (mAttachInfo != null) { 6842 mAttachInfo.mViewVisibilityChanged = true; 6843 } 6844 } 6845 6846 if ((changed & VISIBILITY_MASK) != 0) { 6847 if (mParent instanceof ViewGroup) { 6848 ((ViewGroup) mParent).onChildVisibilityChanged(this, (changed & VISIBILITY_MASK), 6849 (flags & VISIBILITY_MASK)); 6850 ((View) mParent).invalidate(true); 6851 } else if (mParent != null) { 6852 mParent.invalidateChild(this, null); 6853 } 6854 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6855 } 6856 6857 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6858 destroyDrawingCache(); 6859 } 6860 6861 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6862 destroyDrawingCache(); 6863 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6864 invalidateParentCaches(); 6865 } 6866 6867 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6868 destroyDrawingCache(); 6869 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6870 } 6871 6872 if ((changed & DRAW_MASK) != 0) { 6873 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6874 if (mBGDrawable != null) { 6875 mPrivateFlags &= ~SKIP_DRAW; 6876 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6877 } else { 6878 mPrivateFlags |= SKIP_DRAW; 6879 } 6880 } else { 6881 mPrivateFlags &= ~SKIP_DRAW; 6882 } 6883 requestLayout(); 6884 invalidate(true); 6885 } 6886 6887 if ((changed & KEEP_SCREEN_ON) != 0) { 6888 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6889 mParent.recomputeViewAttributes(this); 6890 } 6891 } 6892 6893 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6894 requestLayout(); 6895 } 6896 } 6897 6898 /** 6899 * Change the view's z order in the tree, so it's on top of other sibling 6900 * views 6901 */ 6902 public void bringToFront() { 6903 if (mParent != null) { 6904 mParent.bringChildToFront(this); 6905 } 6906 } 6907 6908 /** 6909 * This is called in response to an internal scroll in this view (i.e., the 6910 * view scrolled its own contents). This is typically as a result of 6911 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6912 * called. 6913 * 6914 * @param l Current horizontal scroll origin. 6915 * @param t Current vertical scroll origin. 6916 * @param oldl Previous horizontal scroll origin. 6917 * @param oldt Previous vertical scroll origin. 6918 */ 6919 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6920 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 6921 postSendViewScrolledAccessibilityEventCallback(); 6922 } 6923 6924 mBackgroundSizeChanged = true; 6925 6926 final AttachInfo ai = mAttachInfo; 6927 if (ai != null) { 6928 ai.mViewScrollChanged = true; 6929 } 6930 } 6931 6932 /** 6933 * Interface definition for a callback to be invoked when the layout bounds of a view 6934 * changes due to layout processing. 6935 */ 6936 public interface OnLayoutChangeListener { 6937 /** 6938 * Called when the focus state of a view has changed. 6939 * 6940 * @param v The view whose state has changed. 6941 * @param left The new value of the view's left property. 6942 * @param top The new value of the view's top property. 6943 * @param right The new value of the view's right property. 6944 * @param bottom The new value of the view's bottom property. 6945 * @param oldLeft The previous value of the view's left property. 6946 * @param oldTop The previous value of the view's top property. 6947 * @param oldRight The previous value of the view's right property. 6948 * @param oldBottom The previous value of the view's bottom property. 6949 */ 6950 void onLayoutChange(View v, int left, int top, int right, int bottom, 6951 int oldLeft, int oldTop, int oldRight, int oldBottom); 6952 } 6953 6954 /** 6955 * This is called during layout when the size of this view has changed. If 6956 * you were just added to the view hierarchy, you're called with the old 6957 * values of 0. 6958 * 6959 * @param w Current width of this view. 6960 * @param h Current height of this view. 6961 * @param oldw Old width of this view. 6962 * @param oldh Old height of this view. 6963 */ 6964 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 6965 } 6966 6967 /** 6968 * Called by draw to draw the child views. This may be overridden 6969 * by derived classes to gain control just before its children are drawn 6970 * (but after its own view has been drawn). 6971 * @param canvas the canvas on which to draw the view 6972 */ 6973 protected void dispatchDraw(Canvas canvas) { 6974 } 6975 6976 /** 6977 * Gets the parent of this view. Note that the parent is a 6978 * ViewParent and not necessarily a View. 6979 * 6980 * @return Parent of this view. 6981 */ 6982 public final ViewParent getParent() { 6983 return mParent; 6984 } 6985 6986 /** 6987 * Set the horizontal scrolled position of your view. This will cause a call to 6988 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6989 * invalidated. 6990 * @param value the x position to scroll to 6991 */ 6992 public void setScrollX(int value) { 6993 scrollTo(value, mScrollY); 6994 } 6995 6996 /** 6997 * Set the vertical scrolled position of your view. This will cause a call to 6998 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6999 * invalidated. 7000 * @param value the y position to scroll to 7001 */ 7002 public void setScrollY(int value) { 7003 scrollTo(mScrollX, value); 7004 } 7005 7006 /** 7007 * Return the scrolled left position of this view. This is the left edge of 7008 * the displayed part of your view. You do not need to draw any pixels 7009 * farther left, since those are outside of the frame of your view on 7010 * screen. 7011 * 7012 * @return The left edge of the displayed part of your view, in pixels. 7013 */ 7014 public final int getScrollX() { 7015 return mScrollX; 7016 } 7017 7018 /** 7019 * Return the scrolled top position of this view. This is the top edge of 7020 * the displayed part of your view. You do not need to draw any pixels above 7021 * it, since those are outside of the frame of your view on screen. 7022 * 7023 * @return The top edge of the displayed part of your view, in pixels. 7024 */ 7025 public final int getScrollY() { 7026 return mScrollY; 7027 } 7028 7029 /** 7030 * Return the width of the your view. 7031 * 7032 * @return The width of your view, in pixels. 7033 */ 7034 @ViewDebug.ExportedProperty(category = "layout") 7035 public final int getWidth() { 7036 return mRight - mLeft; 7037 } 7038 7039 /** 7040 * Return the height of your view. 7041 * 7042 * @return The height of your view, in pixels. 7043 */ 7044 @ViewDebug.ExportedProperty(category = "layout") 7045 public final int getHeight() { 7046 return mBottom - mTop; 7047 } 7048 7049 /** 7050 * Return the visible drawing bounds of your view. Fills in the output 7051 * rectangle with the values from getScrollX(), getScrollY(), 7052 * getWidth(), and getHeight(). 7053 * 7054 * @param outRect The (scrolled) drawing bounds of the view. 7055 */ 7056 public void getDrawingRect(Rect outRect) { 7057 outRect.left = mScrollX; 7058 outRect.top = mScrollY; 7059 outRect.right = mScrollX + (mRight - mLeft); 7060 outRect.bottom = mScrollY + (mBottom - mTop); 7061 } 7062 7063 /** 7064 * Like {@link #getMeasuredWidthAndState()}, but only returns the 7065 * raw width component (that is the result is masked by 7066 * {@link #MEASURED_SIZE_MASK}). 7067 * 7068 * @return The raw measured width of this view. 7069 */ 7070 public final int getMeasuredWidth() { 7071 return mMeasuredWidth & MEASURED_SIZE_MASK; 7072 } 7073 7074 /** 7075 * Return the full width measurement information for this view as computed 7076 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7077 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7078 * This should be used during measurement and layout calculations only. Use 7079 * {@link #getWidth()} to see how wide a view is after layout. 7080 * 7081 * @return The measured width of this view as a bit mask. 7082 */ 7083 public final int getMeasuredWidthAndState() { 7084 return mMeasuredWidth; 7085 } 7086 7087 /** 7088 * Like {@link #getMeasuredHeightAndState()}, but only returns the 7089 * raw width component (that is the result is masked by 7090 * {@link #MEASURED_SIZE_MASK}). 7091 * 7092 * @return The raw measured height of this view. 7093 */ 7094 public final int getMeasuredHeight() { 7095 return mMeasuredHeight & MEASURED_SIZE_MASK; 7096 } 7097 7098 /** 7099 * Return the full height measurement information for this view as computed 7100 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7101 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7102 * This should be used during measurement and layout calculations only. Use 7103 * {@link #getHeight()} to see how wide a view is after layout. 7104 * 7105 * @return The measured width of this view as a bit mask. 7106 */ 7107 public final int getMeasuredHeightAndState() { 7108 return mMeasuredHeight; 7109 } 7110 7111 /** 7112 * Return only the state bits of {@link #getMeasuredWidthAndState()} 7113 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 7114 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 7115 * and the height component is at the shifted bits 7116 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 7117 */ 7118 public final int getMeasuredState() { 7119 return (mMeasuredWidth&MEASURED_STATE_MASK) 7120 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 7121 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 7122 } 7123 7124 /** 7125 * The transform matrix of this view, which is calculated based on the current 7126 * roation, scale, and pivot properties. 7127 * 7128 * @see #getRotation() 7129 * @see #getScaleX() 7130 * @see #getScaleY() 7131 * @see #getPivotX() 7132 * @see #getPivotY() 7133 * @return The current transform matrix for the view 7134 */ 7135 public Matrix getMatrix() { 7136 if (mTransformationInfo != null) { 7137 updateMatrix(); 7138 return mTransformationInfo.mMatrix; 7139 } 7140 return Matrix.IDENTITY_MATRIX; 7141 } 7142 7143 /** 7144 * Utility function to determine if the value is far enough away from zero to be 7145 * considered non-zero. 7146 * @param value A floating point value to check for zero-ness 7147 * @return whether the passed-in value is far enough away from zero to be considered non-zero 7148 */ 7149 private static boolean nonzero(float value) { 7150 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 7151 } 7152 7153 /** 7154 * Returns true if the transform matrix is the identity matrix. 7155 * Recomputes the matrix if necessary. 7156 * 7157 * @return True if the transform matrix is the identity matrix, false otherwise. 7158 */ 7159 final boolean hasIdentityMatrix() { 7160 if (mTransformationInfo != null) { 7161 updateMatrix(); 7162 return mTransformationInfo.mMatrixIsIdentity; 7163 } 7164 return true; 7165 } 7166 7167 void ensureTransformationInfo() { 7168 if (mTransformationInfo == null) { 7169 mTransformationInfo = new TransformationInfo(); 7170 } 7171 } 7172 7173 /** 7174 * Recomputes the transform matrix if necessary. 7175 */ 7176 private void updateMatrix() { 7177 final TransformationInfo info = mTransformationInfo; 7178 if (info == null) { 7179 return; 7180 } 7181 if (info.mMatrixDirty) { 7182 // transform-related properties have changed since the last time someone 7183 // asked for the matrix; recalculate it with the current values 7184 7185 // Figure out if we need to update the pivot point 7186 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7187 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 7188 info.mPrevWidth = mRight - mLeft; 7189 info.mPrevHeight = mBottom - mTop; 7190 info.mPivotX = info.mPrevWidth / 2f; 7191 info.mPivotY = info.mPrevHeight / 2f; 7192 } 7193 } 7194 info.mMatrix.reset(); 7195 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 7196 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 7197 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 7198 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7199 } else { 7200 if (info.mCamera == null) { 7201 info.mCamera = new Camera(); 7202 info.matrix3D = new Matrix(); 7203 } 7204 info.mCamera.save(); 7205 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7206 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 7207 info.mCamera.getMatrix(info.matrix3D); 7208 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 7209 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 7210 info.mPivotY + info.mTranslationY); 7211 info.mMatrix.postConcat(info.matrix3D); 7212 info.mCamera.restore(); 7213 } 7214 info.mMatrixDirty = false; 7215 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 7216 info.mInverseMatrixDirty = true; 7217 } 7218 } 7219 7220 /** 7221 * Utility method to retrieve the inverse of the current mMatrix property. 7222 * We cache the matrix to avoid recalculating it when transform properties 7223 * have not changed. 7224 * 7225 * @return The inverse of the current matrix of this view. 7226 */ 7227 final Matrix getInverseMatrix() { 7228 final TransformationInfo info = mTransformationInfo; 7229 if (info != null) { 7230 updateMatrix(); 7231 if (info.mInverseMatrixDirty) { 7232 if (info.mInverseMatrix == null) { 7233 info.mInverseMatrix = new Matrix(); 7234 } 7235 info.mMatrix.invert(info.mInverseMatrix); 7236 info.mInverseMatrixDirty = false; 7237 } 7238 return info.mInverseMatrix; 7239 } 7240 return Matrix.IDENTITY_MATRIX; 7241 } 7242 7243 /** 7244 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 7245 * views are drawn) from the camera to this view. The camera's distance 7246 * affects 3D transformations, for instance rotations around the X and Y 7247 * axis. If the rotationX or rotationY properties are changed and this view is 7248 * large (more than half the size of the screen), it is recommended to always 7249 * use a camera distance that's greater than the height (X axis rotation) or 7250 * the width (Y axis rotation) of this view.</p> 7251 * 7252 * <p>The distance of the camera from the view plane can have an affect on the 7253 * perspective distortion of the view when it is rotated around the x or y axis. 7254 * For example, a large distance will result in a large viewing angle, and there 7255 * will not be much perspective distortion of the view as it rotates. A short 7256 * distance may cause much more perspective distortion upon rotation, and can 7257 * also result in some drawing artifacts if the rotated view ends up partially 7258 * behind the camera (which is why the recommendation is to use a distance at 7259 * least as far as the size of the view, if the view is to be rotated.)</p> 7260 * 7261 * <p>The distance is expressed in "depth pixels." The default distance depends 7262 * on the screen density. For instance, on a medium density display, the 7263 * default distance is 1280. On a high density display, the default distance 7264 * is 1920.</p> 7265 * 7266 * <p>If you want to specify a distance that leads to visually consistent 7267 * results across various densities, use the following formula:</p> 7268 * <pre> 7269 * float scale = context.getResources().getDisplayMetrics().density; 7270 * view.setCameraDistance(distance * scale); 7271 * </pre> 7272 * 7273 * <p>The density scale factor of a high density display is 1.5, 7274 * and 1920 = 1280 * 1.5.</p> 7275 * 7276 * @param distance The distance in "depth pixels", if negative the opposite 7277 * value is used 7278 * 7279 * @see #setRotationX(float) 7280 * @see #setRotationY(float) 7281 */ 7282 public void setCameraDistance(float distance) { 7283 invalidateParentCaches(); 7284 invalidate(false); 7285 7286 ensureTransformationInfo(); 7287 final float dpi = mResources.getDisplayMetrics().densityDpi; 7288 final TransformationInfo info = mTransformationInfo; 7289 if (info.mCamera == null) { 7290 info.mCamera = new Camera(); 7291 info.matrix3D = new Matrix(); 7292 } 7293 7294 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 7295 info.mMatrixDirty = true; 7296 7297 invalidate(false); 7298 } 7299 7300 /** 7301 * The degrees that the view is rotated around the pivot point. 7302 * 7303 * @see #setRotation(float) 7304 * @see #getPivotX() 7305 * @see #getPivotY() 7306 * 7307 * @return The degrees of rotation. 7308 */ 7309 public float getRotation() { 7310 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 7311 } 7312 7313 /** 7314 * Sets the degrees that the view is rotated around the pivot point. Increasing values 7315 * result in clockwise rotation. 7316 * 7317 * @param rotation The degrees of rotation. 7318 * 7319 * @see #getRotation() 7320 * @see #getPivotX() 7321 * @see #getPivotY() 7322 * @see #setRotationX(float) 7323 * @see #setRotationY(float) 7324 * 7325 * @attr ref android.R.styleable#View_rotation 7326 */ 7327 public void setRotation(float rotation) { 7328 ensureTransformationInfo(); 7329 final TransformationInfo info = mTransformationInfo; 7330 if (info.mRotation != rotation) { 7331 invalidateParentCaches(); 7332 // Double-invalidation is necessary to capture view's old and new areas 7333 invalidate(false); 7334 info.mRotation = rotation; 7335 info.mMatrixDirty = true; 7336 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7337 invalidate(false); 7338 } 7339 } 7340 7341 /** 7342 * The degrees that the view is rotated around the vertical axis through the pivot point. 7343 * 7344 * @see #getPivotX() 7345 * @see #getPivotY() 7346 * @see #setRotationY(float) 7347 * 7348 * @return The degrees of Y rotation. 7349 */ 7350 public float getRotationY() { 7351 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 7352 } 7353 7354 /** 7355 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 7356 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 7357 * down the y axis. 7358 * 7359 * When rotating large views, it is recommended to adjust the camera distance 7360 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7361 * 7362 * @param rotationY The degrees of Y rotation. 7363 * 7364 * @see #getRotationY() 7365 * @see #getPivotX() 7366 * @see #getPivotY() 7367 * @see #setRotation(float) 7368 * @see #setRotationX(float) 7369 * @see #setCameraDistance(float) 7370 * 7371 * @attr ref android.R.styleable#View_rotationY 7372 */ 7373 public void setRotationY(float rotationY) { 7374 ensureTransformationInfo(); 7375 final TransformationInfo info = mTransformationInfo; 7376 if (info.mRotationY != rotationY) { 7377 invalidateParentCaches(); 7378 // Double-invalidation is necessary to capture view's old and new areas 7379 invalidate(false); 7380 info.mRotationY = rotationY; 7381 info.mMatrixDirty = true; 7382 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7383 invalidate(false); 7384 } 7385 } 7386 7387 /** 7388 * The degrees that the view is rotated around the horizontal axis through the pivot point. 7389 * 7390 * @see #getPivotX() 7391 * @see #getPivotY() 7392 * @see #setRotationX(float) 7393 * 7394 * @return The degrees of X rotation. 7395 */ 7396 public float getRotationX() { 7397 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 7398 } 7399 7400 /** 7401 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 7402 * Increasing values result in clockwise rotation from the viewpoint of looking down the 7403 * x axis. 7404 * 7405 * When rotating large views, it is recommended to adjust the camera distance 7406 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7407 * 7408 * @param rotationX The degrees of X rotation. 7409 * 7410 * @see #getRotationX() 7411 * @see #getPivotX() 7412 * @see #getPivotY() 7413 * @see #setRotation(float) 7414 * @see #setRotationY(float) 7415 * @see #setCameraDistance(float) 7416 * 7417 * @attr ref android.R.styleable#View_rotationX 7418 */ 7419 public void setRotationX(float rotationX) { 7420 ensureTransformationInfo(); 7421 final TransformationInfo info = mTransformationInfo; 7422 if (info.mRotationX != rotationX) { 7423 invalidateParentCaches(); 7424 // Double-invalidation is necessary to capture view's old and new areas 7425 invalidate(false); 7426 info.mRotationX = rotationX; 7427 info.mMatrixDirty = true; 7428 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7429 invalidate(false); 7430 } 7431 } 7432 7433 /** 7434 * The amount that the view is scaled in x around the pivot point, as a proportion of 7435 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 7436 * 7437 * <p>By default, this is 1.0f. 7438 * 7439 * @see #getPivotX() 7440 * @see #getPivotY() 7441 * @return The scaling factor. 7442 */ 7443 public float getScaleX() { 7444 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 7445 } 7446 7447 /** 7448 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 7449 * the view's unscaled width. A value of 1 means that no scaling is applied. 7450 * 7451 * @param scaleX The scaling factor. 7452 * @see #getPivotX() 7453 * @see #getPivotY() 7454 * 7455 * @attr ref android.R.styleable#View_scaleX 7456 */ 7457 public void setScaleX(float scaleX) { 7458 ensureTransformationInfo(); 7459 final TransformationInfo info = mTransformationInfo; 7460 if (info.mScaleX != scaleX) { 7461 invalidateParentCaches(); 7462 // Double-invalidation is necessary to capture view's old and new areas 7463 invalidate(false); 7464 info.mScaleX = scaleX; 7465 info.mMatrixDirty = true; 7466 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7467 invalidate(false); 7468 } 7469 } 7470 7471 /** 7472 * The amount that the view is scaled in y around the pivot point, as a proportion of 7473 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 7474 * 7475 * <p>By default, this is 1.0f. 7476 * 7477 * @see #getPivotX() 7478 * @see #getPivotY() 7479 * @return The scaling factor. 7480 */ 7481 public float getScaleY() { 7482 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 7483 } 7484 7485 /** 7486 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 7487 * the view's unscaled width. A value of 1 means that no scaling is applied. 7488 * 7489 * @param scaleY The scaling factor. 7490 * @see #getPivotX() 7491 * @see #getPivotY() 7492 * 7493 * @attr ref android.R.styleable#View_scaleY 7494 */ 7495 public void setScaleY(float scaleY) { 7496 ensureTransformationInfo(); 7497 final TransformationInfo info = mTransformationInfo; 7498 if (info.mScaleY != scaleY) { 7499 invalidateParentCaches(); 7500 // Double-invalidation is necessary to capture view's old and new areas 7501 invalidate(false); 7502 info.mScaleY = scaleY; 7503 info.mMatrixDirty = true; 7504 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7505 invalidate(false); 7506 } 7507 } 7508 7509 /** 7510 * The x location of the point around which the view is {@link #setRotation(float) rotated} 7511 * and {@link #setScaleX(float) scaled}. 7512 * 7513 * @see #getRotation() 7514 * @see #getScaleX() 7515 * @see #getScaleY() 7516 * @see #getPivotY() 7517 * @return The x location of the pivot point. 7518 */ 7519 public float getPivotX() { 7520 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 7521 } 7522 7523 /** 7524 * Sets the x location of the point around which the view is 7525 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 7526 * By default, the pivot point is centered on the object. 7527 * Setting this property disables this behavior and causes the view to use only the 7528 * explicitly set pivotX and pivotY values. 7529 * 7530 * @param pivotX The x location of the pivot point. 7531 * @see #getRotation() 7532 * @see #getScaleX() 7533 * @see #getScaleY() 7534 * @see #getPivotY() 7535 * 7536 * @attr ref android.R.styleable#View_transformPivotX 7537 */ 7538 public void setPivotX(float pivotX) { 7539 ensureTransformationInfo(); 7540 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7541 final TransformationInfo info = mTransformationInfo; 7542 if (info.mPivotX != pivotX) { 7543 invalidateParentCaches(); 7544 // Double-invalidation is necessary to capture view's old and new areas 7545 invalidate(false); 7546 info.mPivotX = pivotX; 7547 info.mMatrixDirty = true; 7548 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7549 invalidate(false); 7550 } 7551 } 7552 7553 /** 7554 * The y location of the point around which the view is {@link #setRotation(float) rotated} 7555 * and {@link #setScaleY(float) scaled}. 7556 * 7557 * @see #getRotation() 7558 * @see #getScaleX() 7559 * @see #getScaleY() 7560 * @see #getPivotY() 7561 * @return The y location of the pivot point. 7562 */ 7563 public float getPivotY() { 7564 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 7565 } 7566 7567 /** 7568 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 7569 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 7570 * Setting this property disables this behavior and causes the view to use only the 7571 * explicitly set pivotX and pivotY values. 7572 * 7573 * @param pivotY The y location of the pivot point. 7574 * @see #getRotation() 7575 * @see #getScaleX() 7576 * @see #getScaleY() 7577 * @see #getPivotY() 7578 * 7579 * @attr ref android.R.styleable#View_transformPivotY 7580 */ 7581 public void setPivotY(float pivotY) { 7582 ensureTransformationInfo(); 7583 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7584 final TransformationInfo info = mTransformationInfo; 7585 if (info.mPivotY != pivotY) { 7586 invalidateParentCaches(); 7587 // Double-invalidation is necessary to capture view's old and new areas 7588 invalidate(false); 7589 info.mPivotY = pivotY; 7590 info.mMatrixDirty = true; 7591 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7592 invalidate(false); 7593 } 7594 } 7595 7596 /** 7597 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 7598 * completely transparent and 1 means the view is completely opaque. 7599 * 7600 * <p>By default this is 1.0f. 7601 * @return The opacity of the view. 7602 */ 7603 public float getAlpha() { 7604 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 7605 } 7606 7607 /** 7608 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 7609 * completely transparent and 1 means the view is completely opaque.</p> 7610 * 7611 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 7612 * responsible for applying the opacity itself. Otherwise, calling this method is 7613 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 7614 * setting a hardware layer.</p> 7615 * 7616 * @param alpha The opacity of the view. 7617 * 7618 * @see #setLayerType(int, android.graphics.Paint) 7619 * 7620 * @attr ref android.R.styleable#View_alpha 7621 */ 7622 public void setAlpha(float alpha) { 7623 ensureTransformationInfo(); 7624 if (mTransformationInfo.mAlpha != alpha) { 7625 mTransformationInfo.mAlpha = alpha; 7626 invalidateParentCaches(); 7627 if (onSetAlpha((int) (alpha * 255))) { 7628 mPrivateFlags |= ALPHA_SET; 7629 // subclass is handling alpha - don't optimize rendering cache invalidation 7630 invalidate(true); 7631 } else { 7632 mPrivateFlags &= ~ALPHA_SET; 7633 invalidate(false); 7634 } 7635 } 7636 } 7637 7638 /** 7639 * Faster version of setAlpha() which performs the same steps except there are 7640 * no calls to invalidate(). The caller of this function should perform proper invalidation 7641 * on the parent and this object. The return value indicates whether the subclass handles 7642 * alpha (the return value for onSetAlpha()). 7643 * 7644 * @param alpha The new value for the alpha property 7645 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 7646 * the new value for the alpha property is different from the old value 7647 */ 7648 boolean setAlphaNoInvalidation(float alpha) { 7649 ensureTransformationInfo(); 7650 if (mTransformationInfo.mAlpha != alpha) { 7651 mTransformationInfo.mAlpha = alpha; 7652 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 7653 if (subclassHandlesAlpha) { 7654 mPrivateFlags |= ALPHA_SET; 7655 return true; 7656 } else { 7657 mPrivateFlags &= ~ALPHA_SET; 7658 } 7659 } 7660 return false; 7661 } 7662 7663 /** 7664 * Top position of this view relative to its parent. 7665 * 7666 * @return The top of this view, in pixels. 7667 */ 7668 @ViewDebug.CapturedViewProperty 7669 public final int getTop() { 7670 return mTop; 7671 } 7672 7673 /** 7674 * Sets the top position of this view relative to its parent. This method is meant to be called 7675 * by the layout system and should not generally be called otherwise, because the property 7676 * may be changed at any time by the layout. 7677 * 7678 * @param top The top of this view, in pixels. 7679 */ 7680 public final void setTop(int top) { 7681 if (top != mTop) { 7682 updateMatrix(); 7683 final boolean matrixIsIdentity = mTransformationInfo == null 7684 || mTransformationInfo.mMatrixIsIdentity; 7685 if (matrixIsIdentity) { 7686 if (mAttachInfo != null) { 7687 int minTop; 7688 int yLoc; 7689 if (top < mTop) { 7690 minTop = top; 7691 yLoc = top - mTop; 7692 } else { 7693 minTop = mTop; 7694 yLoc = 0; 7695 } 7696 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 7697 } 7698 } else { 7699 // Double-invalidation is necessary to capture view's old and new areas 7700 invalidate(true); 7701 } 7702 7703 int width = mRight - mLeft; 7704 int oldHeight = mBottom - mTop; 7705 7706 mTop = top; 7707 7708 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7709 7710 if (!matrixIsIdentity) { 7711 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7712 // A change in dimension means an auto-centered pivot point changes, too 7713 mTransformationInfo.mMatrixDirty = true; 7714 } 7715 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7716 invalidate(true); 7717 } 7718 mBackgroundSizeChanged = true; 7719 invalidateParentIfNeeded(); 7720 } 7721 } 7722 7723 /** 7724 * Bottom position of this view relative to its parent. 7725 * 7726 * @return The bottom of this view, in pixels. 7727 */ 7728 @ViewDebug.CapturedViewProperty 7729 public final int getBottom() { 7730 return mBottom; 7731 } 7732 7733 /** 7734 * True if this view has changed since the last time being drawn. 7735 * 7736 * @return The dirty state of this view. 7737 */ 7738 public boolean isDirty() { 7739 return (mPrivateFlags & DIRTY_MASK) != 0; 7740 } 7741 7742 /** 7743 * Sets the bottom position of this view relative to its parent. This method is meant to be 7744 * called by the layout system and should not generally be called otherwise, because the 7745 * property may be changed at any time by the layout. 7746 * 7747 * @param bottom The bottom of this view, in pixels. 7748 */ 7749 public final void setBottom(int bottom) { 7750 if (bottom != mBottom) { 7751 updateMatrix(); 7752 final boolean matrixIsIdentity = mTransformationInfo == null 7753 || mTransformationInfo.mMatrixIsIdentity; 7754 if (matrixIsIdentity) { 7755 if (mAttachInfo != null) { 7756 int maxBottom; 7757 if (bottom < mBottom) { 7758 maxBottom = mBottom; 7759 } else { 7760 maxBottom = bottom; 7761 } 7762 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 7763 } 7764 } else { 7765 // Double-invalidation is necessary to capture view's old and new areas 7766 invalidate(true); 7767 } 7768 7769 int width = mRight - mLeft; 7770 int oldHeight = mBottom - mTop; 7771 7772 mBottom = bottom; 7773 7774 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7775 7776 if (!matrixIsIdentity) { 7777 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7778 // A change in dimension means an auto-centered pivot point changes, too 7779 mTransformationInfo.mMatrixDirty = true; 7780 } 7781 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7782 invalidate(true); 7783 } 7784 mBackgroundSizeChanged = true; 7785 invalidateParentIfNeeded(); 7786 } 7787 } 7788 7789 /** 7790 * Left position of this view relative to its parent. 7791 * 7792 * @return The left edge of this view, in pixels. 7793 */ 7794 @ViewDebug.CapturedViewProperty 7795 public final int getLeft() { 7796 return mLeft; 7797 } 7798 7799 /** 7800 * Sets the left position of this view relative to its parent. This method is meant to be called 7801 * by the layout system and should not generally be called otherwise, because the property 7802 * may be changed at any time by the layout. 7803 * 7804 * @param left The bottom of this view, in pixels. 7805 */ 7806 public final void setLeft(int left) { 7807 if (left != mLeft) { 7808 updateMatrix(); 7809 final boolean matrixIsIdentity = mTransformationInfo == null 7810 || mTransformationInfo.mMatrixIsIdentity; 7811 if (matrixIsIdentity) { 7812 if (mAttachInfo != null) { 7813 int minLeft; 7814 int xLoc; 7815 if (left < mLeft) { 7816 minLeft = left; 7817 xLoc = left - mLeft; 7818 } else { 7819 minLeft = mLeft; 7820 xLoc = 0; 7821 } 7822 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7823 } 7824 } else { 7825 // Double-invalidation is necessary to capture view's old and new areas 7826 invalidate(true); 7827 } 7828 7829 int oldWidth = mRight - mLeft; 7830 int height = mBottom - mTop; 7831 7832 mLeft = left; 7833 7834 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7835 7836 if (!matrixIsIdentity) { 7837 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7838 // A change in dimension means an auto-centered pivot point changes, too 7839 mTransformationInfo.mMatrixDirty = true; 7840 } 7841 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7842 invalidate(true); 7843 } 7844 mBackgroundSizeChanged = true; 7845 invalidateParentIfNeeded(); 7846 } 7847 } 7848 7849 /** 7850 * Right position of this view relative to its parent. 7851 * 7852 * @return The right edge of this view, in pixels. 7853 */ 7854 @ViewDebug.CapturedViewProperty 7855 public final int getRight() { 7856 return mRight; 7857 } 7858 7859 /** 7860 * Sets the right position of this view relative to its parent. This method is meant to be called 7861 * by the layout system and should not generally be called otherwise, because the property 7862 * may be changed at any time by the layout. 7863 * 7864 * @param right The bottom of this view, in pixels. 7865 */ 7866 public final void setRight(int right) { 7867 if (right != mRight) { 7868 updateMatrix(); 7869 final boolean matrixIsIdentity = mTransformationInfo == null 7870 || mTransformationInfo.mMatrixIsIdentity; 7871 if (matrixIsIdentity) { 7872 if (mAttachInfo != null) { 7873 int maxRight; 7874 if (right < mRight) { 7875 maxRight = mRight; 7876 } else { 7877 maxRight = right; 7878 } 7879 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7880 } 7881 } else { 7882 // Double-invalidation is necessary to capture view's old and new areas 7883 invalidate(true); 7884 } 7885 7886 int oldWidth = mRight - mLeft; 7887 int height = mBottom - mTop; 7888 7889 mRight = right; 7890 7891 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7892 7893 if (!matrixIsIdentity) { 7894 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7895 // A change in dimension means an auto-centered pivot point changes, too 7896 mTransformationInfo.mMatrixDirty = true; 7897 } 7898 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7899 invalidate(true); 7900 } 7901 mBackgroundSizeChanged = true; 7902 invalidateParentIfNeeded(); 7903 } 7904 } 7905 7906 /** 7907 * The visual x position of this view, in pixels. This is equivalent to the 7908 * {@link #setTranslationX(float) translationX} property plus the current 7909 * {@link #getLeft() left} property. 7910 * 7911 * @return The visual x position of this view, in pixels. 7912 */ 7913 public float getX() { 7914 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 7915 } 7916 7917 /** 7918 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 7919 * {@link #setTranslationX(float) translationX} property to be the difference between 7920 * the x value passed in and the current {@link #getLeft() left} property. 7921 * 7922 * @param x The visual x position of this view, in pixels. 7923 */ 7924 public void setX(float x) { 7925 setTranslationX(x - mLeft); 7926 } 7927 7928 /** 7929 * The visual y position of this view, in pixels. This is equivalent to the 7930 * {@link #setTranslationY(float) translationY} property plus the current 7931 * {@link #getTop() top} property. 7932 * 7933 * @return The visual y position of this view, in pixels. 7934 */ 7935 public float getY() { 7936 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 7937 } 7938 7939 /** 7940 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 7941 * {@link #setTranslationY(float) translationY} property to be the difference between 7942 * the y value passed in and the current {@link #getTop() top} property. 7943 * 7944 * @param y The visual y position of this view, in pixels. 7945 */ 7946 public void setY(float y) { 7947 setTranslationY(y - mTop); 7948 } 7949 7950 7951 /** 7952 * The horizontal location of this view relative to its {@link #getLeft() left} position. 7953 * This position is post-layout, in addition to wherever the object's 7954 * layout placed it. 7955 * 7956 * @return The horizontal position of this view relative to its left position, in pixels. 7957 */ 7958 public float getTranslationX() { 7959 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 7960 } 7961 7962 /** 7963 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 7964 * This effectively positions the object post-layout, in addition to wherever the object's 7965 * layout placed it. 7966 * 7967 * @param translationX The horizontal position of this view relative to its left position, 7968 * in pixels. 7969 * 7970 * @attr ref android.R.styleable#View_translationX 7971 */ 7972 public void setTranslationX(float translationX) { 7973 ensureTransformationInfo(); 7974 final TransformationInfo info = mTransformationInfo; 7975 if (info.mTranslationX != translationX) { 7976 invalidateParentCaches(); 7977 // Double-invalidation is necessary to capture view's old and new areas 7978 invalidate(false); 7979 info.mTranslationX = translationX; 7980 info.mMatrixDirty = true; 7981 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7982 invalidate(false); 7983 } 7984 } 7985 7986 /** 7987 * The horizontal location of this view relative to its {@link #getTop() top} position. 7988 * This position is post-layout, in addition to wherever the object's 7989 * layout placed it. 7990 * 7991 * @return The vertical position of this view relative to its top position, 7992 * in pixels. 7993 */ 7994 public float getTranslationY() { 7995 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 7996 } 7997 7998 /** 7999 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 8000 * This effectively positions the object post-layout, in addition to wherever the object's 8001 * layout placed it. 8002 * 8003 * @param translationY The vertical position of this view relative to its top position, 8004 * in pixels. 8005 * 8006 * @attr ref android.R.styleable#View_translationY 8007 */ 8008 public void setTranslationY(float translationY) { 8009 ensureTransformationInfo(); 8010 final TransformationInfo info = mTransformationInfo; 8011 if (info.mTranslationY != translationY) { 8012 invalidateParentCaches(); 8013 // Double-invalidation is necessary to capture view's old and new areas 8014 invalidate(false); 8015 info.mTranslationY = translationY; 8016 info.mMatrixDirty = true; 8017 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8018 invalidate(false); 8019 } 8020 } 8021 8022 /** 8023 * Hit rectangle in parent's coordinates 8024 * 8025 * @param outRect The hit rectangle of the view. 8026 */ 8027 public void getHitRect(Rect outRect) { 8028 updateMatrix(); 8029 final TransformationInfo info = mTransformationInfo; 8030 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 8031 outRect.set(mLeft, mTop, mRight, mBottom); 8032 } else { 8033 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 8034 tmpRect.set(-info.mPivotX, -info.mPivotY, 8035 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 8036 info.mMatrix.mapRect(tmpRect); 8037 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 8038 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 8039 } 8040 } 8041 8042 /** 8043 * Determines whether the given point, in local coordinates is inside the view. 8044 */ 8045 /*package*/ final boolean pointInView(float localX, float localY) { 8046 return localX >= 0 && localX < (mRight - mLeft) 8047 && localY >= 0 && localY < (mBottom - mTop); 8048 } 8049 8050 /** 8051 * Utility method to determine whether the given point, in local coordinates, 8052 * is inside the view, where the area of the view is expanded by the slop factor. 8053 * This method is called while processing touch-move events to determine if the event 8054 * is still within the view. 8055 */ 8056 private boolean pointInView(float localX, float localY, float slop) { 8057 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 8058 localY < ((mBottom - mTop) + slop); 8059 } 8060 8061 /** 8062 * When a view has focus and the user navigates away from it, the next view is searched for 8063 * starting from the rectangle filled in by this method. 8064 * 8065 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 8066 * of the view. However, if your view maintains some idea of internal selection, 8067 * such as a cursor, or a selected row or column, you should override this method and 8068 * fill in a more specific rectangle. 8069 * 8070 * @param r The rectangle to fill in, in this view's coordinates. 8071 */ 8072 public void getFocusedRect(Rect r) { 8073 getDrawingRect(r); 8074 } 8075 8076 /** 8077 * If some part of this view is not clipped by any of its parents, then 8078 * return that area in r in global (root) coordinates. To convert r to local 8079 * coordinates (without taking possible View rotations into account), offset 8080 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 8081 * If the view is completely clipped or translated out, return false. 8082 * 8083 * @param r If true is returned, r holds the global coordinates of the 8084 * visible portion of this view. 8085 * @param globalOffset If true is returned, globalOffset holds the dx,dy 8086 * between this view and its root. globalOffet may be null. 8087 * @return true if r is non-empty (i.e. part of the view is visible at the 8088 * root level. 8089 */ 8090 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 8091 int width = mRight - mLeft; 8092 int height = mBottom - mTop; 8093 if (width > 0 && height > 0) { 8094 r.set(0, 0, width, height); 8095 if (globalOffset != null) { 8096 globalOffset.set(-mScrollX, -mScrollY); 8097 } 8098 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 8099 } 8100 return false; 8101 } 8102 8103 public final boolean getGlobalVisibleRect(Rect r) { 8104 return getGlobalVisibleRect(r, null); 8105 } 8106 8107 public final boolean getLocalVisibleRect(Rect r) { 8108 Point offset = new Point(); 8109 if (getGlobalVisibleRect(r, offset)) { 8110 r.offset(-offset.x, -offset.y); // make r local 8111 return true; 8112 } 8113 return false; 8114 } 8115 8116 /** 8117 * Offset this view's vertical location by the specified number of pixels. 8118 * 8119 * @param offset the number of pixels to offset the view by 8120 */ 8121 public void offsetTopAndBottom(int offset) { 8122 if (offset != 0) { 8123 updateMatrix(); 8124 final boolean matrixIsIdentity = mTransformationInfo == null 8125 || mTransformationInfo.mMatrixIsIdentity; 8126 if (matrixIsIdentity) { 8127 final ViewParent p = mParent; 8128 if (p != null && mAttachInfo != null) { 8129 final Rect r = mAttachInfo.mTmpInvalRect; 8130 int minTop; 8131 int maxBottom; 8132 int yLoc; 8133 if (offset < 0) { 8134 minTop = mTop + offset; 8135 maxBottom = mBottom; 8136 yLoc = offset; 8137 } else { 8138 minTop = mTop; 8139 maxBottom = mBottom + offset; 8140 yLoc = 0; 8141 } 8142 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 8143 p.invalidateChild(this, r); 8144 } 8145 } else { 8146 invalidate(false); 8147 } 8148 8149 mTop += offset; 8150 mBottom += offset; 8151 8152 if (!matrixIsIdentity) { 8153 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8154 invalidate(false); 8155 } 8156 invalidateParentIfNeeded(); 8157 } 8158 } 8159 8160 /** 8161 * Offset this view's horizontal location by the specified amount of pixels. 8162 * 8163 * @param offset the numer of pixels to offset the view by 8164 */ 8165 public void offsetLeftAndRight(int offset) { 8166 if (offset != 0) { 8167 updateMatrix(); 8168 final boolean matrixIsIdentity = mTransformationInfo == null 8169 || mTransformationInfo.mMatrixIsIdentity; 8170 if (matrixIsIdentity) { 8171 final ViewParent p = mParent; 8172 if (p != null && mAttachInfo != null) { 8173 final Rect r = mAttachInfo.mTmpInvalRect; 8174 int minLeft; 8175 int maxRight; 8176 if (offset < 0) { 8177 minLeft = mLeft + offset; 8178 maxRight = mRight; 8179 } else { 8180 minLeft = mLeft; 8181 maxRight = mRight + offset; 8182 } 8183 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 8184 p.invalidateChild(this, r); 8185 } 8186 } else { 8187 invalidate(false); 8188 } 8189 8190 mLeft += offset; 8191 mRight += offset; 8192 8193 if (!matrixIsIdentity) { 8194 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8195 invalidate(false); 8196 } 8197 invalidateParentIfNeeded(); 8198 } 8199 } 8200 8201 /** 8202 * Get the LayoutParams associated with this view. All views should have 8203 * layout parameters. These supply parameters to the <i>parent</i> of this 8204 * view specifying how it should be arranged. There are many subclasses of 8205 * ViewGroup.LayoutParams, and these correspond to the different subclasses 8206 * of ViewGroup that are responsible for arranging their children. 8207 * 8208 * This method may return null if this View is not attached to a parent 8209 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 8210 * was not invoked successfully. When a View is attached to a parent 8211 * ViewGroup, this method must not return null. 8212 * 8213 * @return The LayoutParams associated with this view, or null if no 8214 * parameters have been set yet 8215 */ 8216 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 8217 public ViewGroup.LayoutParams getLayoutParams() { 8218 return mLayoutParams; 8219 } 8220 8221 /** 8222 * Set the layout parameters associated with this view. These supply 8223 * parameters to the <i>parent</i> of this view specifying how it should be 8224 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 8225 * correspond to the different subclasses of ViewGroup that are responsible 8226 * for arranging their children. 8227 * 8228 * @param params The layout parameters for this view, cannot be null 8229 */ 8230 public void setLayoutParams(ViewGroup.LayoutParams params) { 8231 if (params == null) { 8232 throw new NullPointerException("Layout parameters cannot be null"); 8233 } 8234 mLayoutParams = params; 8235 requestLayout(); 8236 } 8237 8238 /** 8239 * Set the scrolled position of your view. This will cause a call to 8240 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8241 * invalidated. 8242 * @param x the x position to scroll to 8243 * @param y the y position to scroll to 8244 */ 8245 public void scrollTo(int x, int y) { 8246 if (mScrollX != x || mScrollY != y) { 8247 int oldX = mScrollX; 8248 int oldY = mScrollY; 8249 mScrollX = x; 8250 mScrollY = y; 8251 invalidateParentCaches(); 8252 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 8253 if (!awakenScrollBars()) { 8254 invalidate(true); 8255 } 8256 } 8257 } 8258 8259 /** 8260 * Move the scrolled position of your view. This will cause a call to 8261 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8262 * invalidated. 8263 * @param x the amount of pixels to scroll by horizontally 8264 * @param y the amount of pixels to scroll by vertically 8265 */ 8266 public void scrollBy(int x, int y) { 8267 scrollTo(mScrollX + x, mScrollY + y); 8268 } 8269 8270 /** 8271 * <p>Trigger the scrollbars to draw. When invoked this method starts an 8272 * animation to fade the scrollbars out after a default delay. If a subclass 8273 * provides animated scrolling, the start delay should equal the duration 8274 * of the scrolling animation.</p> 8275 * 8276 * <p>The animation starts only if at least one of the scrollbars is 8277 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 8278 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8279 * this method returns true, and false otherwise. If the animation is 8280 * started, this method calls {@link #invalidate()}; in that case the 8281 * caller should not call {@link #invalidate()}.</p> 8282 * 8283 * <p>This method should be invoked every time a subclass directly updates 8284 * the scroll parameters.</p> 8285 * 8286 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 8287 * and {@link #scrollTo(int, int)}.</p> 8288 * 8289 * @return true if the animation is played, false otherwise 8290 * 8291 * @see #awakenScrollBars(int) 8292 * @see #scrollBy(int, int) 8293 * @see #scrollTo(int, int) 8294 * @see #isHorizontalScrollBarEnabled() 8295 * @see #isVerticalScrollBarEnabled() 8296 * @see #setHorizontalScrollBarEnabled(boolean) 8297 * @see #setVerticalScrollBarEnabled(boolean) 8298 */ 8299 protected boolean awakenScrollBars() { 8300 return mScrollCache != null && 8301 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 8302 } 8303 8304 /** 8305 * Trigger the scrollbars to draw. 8306 * This method differs from awakenScrollBars() only in its default duration. 8307 * initialAwakenScrollBars() will show the scroll bars for longer than 8308 * usual to give the user more of a chance to notice them. 8309 * 8310 * @return true if the animation is played, false otherwise. 8311 */ 8312 private boolean initialAwakenScrollBars() { 8313 return mScrollCache != null && 8314 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 8315 } 8316 8317 /** 8318 * <p> 8319 * Trigger the scrollbars to draw. When invoked this method starts an 8320 * animation to fade the scrollbars out after a fixed delay. If a subclass 8321 * provides animated scrolling, the start delay should equal the duration of 8322 * the scrolling animation. 8323 * </p> 8324 * 8325 * <p> 8326 * The animation starts only if at least one of the scrollbars is enabled, 8327 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8328 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8329 * this method returns true, and false otherwise. If the animation is 8330 * started, this method calls {@link #invalidate()}; in that case the caller 8331 * should not call {@link #invalidate()}. 8332 * </p> 8333 * 8334 * <p> 8335 * This method should be invoked everytime a subclass directly updates the 8336 * scroll parameters. 8337 * </p> 8338 * 8339 * @param startDelay the delay, in milliseconds, after which the animation 8340 * should start; when the delay is 0, the animation starts 8341 * immediately 8342 * @return true if the animation is played, false otherwise 8343 * 8344 * @see #scrollBy(int, int) 8345 * @see #scrollTo(int, int) 8346 * @see #isHorizontalScrollBarEnabled() 8347 * @see #isVerticalScrollBarEnabled() 8348 * @see #setHorizontalScrollBarEnabled(boolean) 8349 * @see #setVerticalScrollBarEnabled(boolean) 8350 */ 8351 protected boolean awakenScrollBars(int startDelay) { 8352 return awakenScrollBars(startDelay, true); 8353 } 8354 8355 /** 8356 * <p> 8357 * Trigger the scrollbars to draw. When invoked this method starts an 8358 * animation to fade the scrollbars out after a fixed delay. If a subclass 8359 * provides animated scrolling, the start delay should equal the duration of 8360 * the scrolling animation. 8361 * </p> 8362 * 8363 * <p> 8364 * The animation starts only if at least one of the scrollbars is enabled, 8365 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8366 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8367 * this method returns true, and false otherwise. If the animation is 8368 * started, this method calls {@link #invalidate()} if the invalidate parameter 8369 * is set to true; in that case the caller 8370 * should not call {@link #invalidate()}. 8371 * </p> 8372 * 8373 * <p> 8374 * This method should be invoked everytime a subclass directly updates the 8375 * scroll parameters. 8376 * </p> 8377 * 8378 * @param startDelay the delay, in milliseconds, after which the animation 8379 * should start; when the delay is 0, the animation starts 8380 * immediately 8381 * 8382 * @param invalidate Wheter this method should call invalidate 8383 * 8384 * @return true if the animation is played, false otherwise 8385 * 8386 * @see #scrollBy(int, int) 8387 * @see #scrollTo(int, int) 8388 * @see #isHorizontalScrollBarEnabled() 8389 * @see #isVerticalScrollBarEnabled() 8390 * @see #setHorizontalScrollBarEnabled(boolean) 8391 * @see #setVerticalScrollBarEnabled(boolean) 8392 */ 8393 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 8394 final ScrollabilityCache scrollCache = mScrollCache; 8395 8396 if (scrollCache == null || !scrollCache.fadeScrollBars) { 8397 return false; 8398 } 8399 8400 if (scrollCache.scrollBar == null) { 8401 scrollCache.scrollBar = new ScrollBarDrawable(); 8402 } 8403 8404 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 8405 8406 if (invalidate) { 8407 // Invalidate to show the scrollbars 8408 invalidate(true); 8409 } 8410 8411 if (scrollCache.state == ScrollabilityCache.OFF) { 8412 // FIXME: this is copied from WindowManagerService. 8413 // We should get this value from the system when it 8414 // is possible to do so. 8415 final int KEY_REPEAT_FIRST_DELAY = 750; 8416 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 8417 } 8418 8419 // Tell mScrollCache when we should start fading. This may 8420 // extend the fade start time if one was already scheduled 8421 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 8422 scrollCache.fadeStartTime = fadeStartTime; 8423 scrollCache.state = ScrollabilityCache.ON; 8424 8425 // Schedule our fader to run, unscheduling any old ones first 8426 if (mAttachInfo != null) { 8427 mAttachInfo.mHandler.removeCallbacks(scrollCache); 8428 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 8429 } 8430 8431 return true; 8432 } 8433 8434 return false; 8435 } 8436 8437 /** 8438 * Do not invalidate views which are not visible and which are not running an animation. They 8439 * will not get drawn and they should not set dirty flags as if they will be drawn 8440 */ 8441 private boolean skipInvalidate() { 8442 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 8443 (!(mParent instanceof ViewGroup) || 8444 !((ViewGroup) mParent).isViewTransitioning(this)); 8445 } 8446 /** 8447 * Mark the area defined by dirty as needing to be drawn. If the view is 8448 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 8449 * in the future. This must be called from a UI thread. To call from a non-UI 8450 * thread, call {@link #postInvalidate()}. 8451 * 8452 * WARNING: This method is destructive to dirty. 8453 * @param dirty the rectangle representing the bounds of the dirty region 8454 */ 8455 public void invalidate(Rect dirty) { 8456 if (ViewDebug.TRACE_HIERARCHY) { 8457 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8458 } 8459 8460 if (skipInvalidate()) { 8461 return; 8462 } 8463 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8464 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8465 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8466 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8467 mPrivateFlags |= INVALIDATED; 8468 mPrivateFlags |= DIRTY; 8469 final ViewParent p = mParent; 8470 final AttachInfo ai = mAttachInfo; 8471 //noinspection PointlessBooleanExpression,ConstantConditions 8472 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8473 if (p != null && ai != null && ai.mHardwareAccelerated) { 8474 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8475 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8476 p.invalidateChild(this, null); 8477 return; 8478 } 8479 } 8480 if (p != null && ai != null) { 8481 final int scrollX = mScrollX; 8482 final int scrollY = mScrollY; 8483 final Rect r = ai.mTmpInvalRect; 8484 r.set(dirty.left - scrollX, dirty.top - scrollY, 8485 dirty.right - scrollX, dirty.bottom - scrollY); 8486 mParent.invalidateChild(this, r); 8487 } 8488 } 8489 } 8490 8491 /** 8492 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 8493 * The coordinates of the dirty rect are relative to the view. 8494 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 8495 * will be called at some point in the future. This must be called from 8496 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 8497 * @param l the left position of the dirty region 8498 * @param t the top position of the dirty region 8499 * @param r the right position of the dirty region 8500 * @param b the bottom position of the dirty region 8501 */ 8502 public void invalidate(int l, int t, int r, int b) { 8503 if (ViewDebug.TRACE_HIERARCHY) { 8504 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8505 } 8506 8507 if (skipInvalidate()) { 8508 return; 8509 } 8510 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8511 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8512 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8513 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8514 mPrivateFlags |= INVALIDATED; 8515 mPrivateFlags |= DIRTY; 8516 final ViewParent p = mParent; 8517 final AttachInfo ai = mAttachInfo; 8518 //noinspection PointlessBooleanExpression,ConstantConditions 8519 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8520 if (p != null && ai != null && ai.mHardwareAccelerated) { 8521 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8522 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8523 p.invalidateChild(this, null); 8524 return; 8525 } 8526 } 8527 if (p != null && ai != null && l < r && t < b) { 8528 final int scrollX = mScrollX; 8529 final int scrollY = mScrollY; 8530 final Rect tmpr = ai.mTmpInvalRect; 8531 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 8532 p.invalidateChild(this, tmpr); 8533 } 8534 } 8535 } 8536 8537 /** 8538 * Invalidate the whole view. If the view is visible, 8539 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 8540 * the future. This must be called from a UI thread. To call from a non-UI thread, 8541 * call {@link #postInvalidate()}. 8542 */ 8543 public void invalidate() { 8544 invalidate(true); 8545 } 8546 8547 /** 8548 * This is where the invalidate() work actually happens. A full invalidate() 8549 * causes the drawing cache to be invalidated, but this function can be called with 8550 * invalidateCache set to false to skip that invalidation step for cases that do not 8551 * need it (for example, a component that remains at the same dimensions with the same 8552 * content). 8553 * 8554 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 8555 * well. This is usually true for a full invalidate, but may be set to false if the 8556 * View's contents or dimensions have not changed. 8557 */ 8558 void invalidate(boolean invalidateCache) { 8559 if (ViewDebug.TRACE_HIERARCHY) { 8560 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8561 } 8562 8563 if (skipInvalidate()) { 8564 return; 8565 } 8566 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8567 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 8568 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 8569 mLastIsOpaque = isOpaque(); 8570 mPrivateFlags &= ~DRAWN; 8571 mPrivateFlags |= DIRTY; 8572 if (invalidateCache) { 8573 mPrivateFlags |= INVALIDATED; 8574 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8575 } 8576 final AttachInfo ai = mAttachInfo; 8577 final ViewParent p = mParent; 8578 //noinspection PointlessBooleanExpression,ConstantConditions 8579 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8580 if (p != null && ai != null && ai.mHardwareAccelerated) { 8581 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8582 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8583 p.invalidateChild(this, null); 8584 return; 8585 } 8586 } 8587 8588 if (p != null && ai != null) { 8589 final Rect r = ai.mTmpInvalRect; 8590 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8591 // Don't call invalidate -- we don't want to internally scroll 8592 // our own bounds 8593 p.invalidateChild(this, r); 8594 } 8595 } 8596 } 8597 8598 /** 8599 * Used to indicate that the parent of this view should clear its caches. This functionality 8600 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8601 * which is necessary when various parent-managed properties of the view change, such as 8602 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 8603 * clears the parent caches and does not causes an invalidate event. 8604 * 8605 * @hide 8606 */ 8607 protected void invalidateParentCaches() { 8608 if (mParent instanceof View) { 8609 ((View) mParent).mPrivateFlags |= INVALIDATED; 8610 } 8611 } 8612 8613 /** 8614 * Used to indicate that the parent of this view should be invalidated. This functionality 8615 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8616 * which is necessary when various parent-managed properties of the view change, such as 8617 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 8618 * an invalidation event to the parent. 8619 * 8620 * @hide 8621 */ 8622 protected void invalidateParentIfNeeded() { 8623 if (isHardwareAccelerated() && mParent instanceof View) { 8624 ((View) mParent).invalidate(true); 8625 } 8626 } 8627 8628 /** 8629 * Indicates whether this View is opaque. An opaque View guarantees that it will 8630 * draw all the pixels overlapping its bounds using a fully opaque color. 8631 * 8632 * Subclasses of View should override this method whenever possible to indicate 8633 * whether an instance is opaque. Opaque Views are treated in a special way by 8634 * the View hierarchy, possibly allowing it to perform optimizations during 8635 * invalidate/draw passes. 8636 * 8637 * @return True if this View is guaranteed to be fully opaque, false otherwise. 8638 */ 8639 @ViewDebug.ExportedProperty(category = "drawing") 8640 public boolean isOpaque() { 8641 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 8642 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 8643 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 8644 } 8645 8646 /** 8647 * @hide 8648 */ 8649 protected void computeOpaqueFlags() { 8650 // Opaque if: 8651 // - Has a background 8652 // - Background is opaque 8653 // - Doesn't have scrollbars or scrollbars are inside overlay 8654 8655 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 8656 mPrivateFlags |= OPAQUE_BACKGROUND; 8657 } else { 8658 mPrivateFlags &= ~OPAQUE_BACKGROUND; 8659 } 8660 8661 final int flags = mViewFlags; 8662 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 8663 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 8664 mPrivateFlags |= OPAQUE_SCROLLBARS; 8665 } else { 8666 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 8667 } 8668 } 8669 8670 /** 8671 * @hide 8672 */ 8673 protected boolean hasOpaqueScrollbars() { 8674 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 8675 } 8676 8677 /** 8678 * @return A handler associated with the thread running the View. This 8679 * handler can be used to pump events in the UI events queue. 8680 */ 8681 public Handler getHandler() { 8682 if (mAttachInfo != null) { 8683 return mAttachInfo.mHandler; 8684 } 8685 return null; 8686 } 8687 8688 /** 8689 * <p>Causes the Runnable to be added to the message queue. 8690 * The runnable will be run on the user interface thread.</p> 8691 * 8692 * <p>This method can be invoked from outside of the UI thread 8693 * only when this View is attached to a window.</p> 8694 * 8695 * @param action The Runnable that will be executed. 8696 * 8697 * @return Returns true if the Runnable was successfully placed in to the 8698 * message queue. Returns false on failure, usually because the 8699 * looper processing the message queue is exiting. 8700 */ 8701 public boolean post(Runnable action) { 8702 Handler handler; 8703 AttachInfo attachInfo = mAttachInfo; 8704 if (attachInfo != null) { 8705 handler = attachInfo.mHandler; 8706 } else { 8707 // Assume that post will succeed later 8708 ViewRootImpl.getRunQueue().post(action); 8709 return true; 8710 } 8711 8712 return handler.post(action); 8713 } 8714 8715 /** 8716 * <p>Causes the Runnable to be added to the message queue, to be run 8717 * after the specified amount of time elapses. 8718 * The runnable will be run on the user interface thread.</p> 8719 * 8720 * <p>This method can be invoked from outside of the UI thread 8721 * only when this View is attached to a window.</p> 8722 * 8723 * @param action The Runnable that will be executed. 8724 * @param delayMillis The delay (in milliseconds) until the Runnable 8725 * will be executed. 8726 * 8727 * @return true if the Runnable was successfully placed in to the 8728 * message queue. Returns false on failure, usually because the 8729 * looper processing the message queue is exiting. Note that a 8730 * result of true does not mean the Runnable will be processed -- 8731 * if the looper is quit before the delivery time of the message 8732 * occurs then the message will be dropped. 8733 */ 8734 public boolean postDelayed(Runnable action, long delayMillis) { 8735 Handler handler; 8736 AttachInfo attachInfo = mAttachInfo; 8737 if (attachInfo != null) { 8738 handler = attachInfo.mHandler; 8739 } else { 8740 // Assume that post will succeed later 8741 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8742 return true; 8743 } 8744 8745 return handler.postDelayed(action, delayMillis); 8746 } 8747 8748 /** 8749 * <p>Removes the specified Runnable from the message queue.</p> 8750 * 8751 * <p>This method can be invoked from outside of the UI thread 8752 * only when this View is attached to a window.</p> 8753 * 8754 * @param action The Runnable to remove from the message handling queue 8755 * 8756 * @return true if this view could ask the Handler to remove the Runnable, 8757 * false otherwise. When the returned value is true, the Runnable 8758 * may or may not have been actually removed from the message queue 8759 * (for instance, if the Runnable was not in the queue already.) 8760 */ 8761 public boolean removeCallbacks(Runnable action) { 8762 Handler handler; 8763 AttachInfo attachInfo = mAttachInfo; 8764 if (attachInfo != null) { 8765 handler = attachInfo.mHandler; 8766 } else { 8767 // Assume that post will succeed later 8768 ViewRootImpl.getRunQueue().removeCallbacks(action); 8769 return true; 8770 } 8771 8772 handler.removeCallbacks(action); 8773 return true; 8774 } 8775 8776 /** 8777 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 8778 * Use this to invalidate the View from a non-UI thread.</p> 8779 * 8780 * <p>This method can be invoked from outside of the UI thread 8781 * only when this View is attached to a window.</p> 8782 * 8783 * @see #invalidate() 8784 */ 8785 public void postInvalidate() { 8786 postInvalidateDelayed(0); 8787 } 8788 8789 /** 8790 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8791 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 8792 * 8793 * <p>This method can be invoked from outside of the UI thread 8794 * only when this View is attached to a window.</p> 8795 * 8796 * @param left The left coordinate of the rectangle to invalidate. 8797 * @param top The top coordinate of the rectangle to invalidate. 8798 * @param right The right coordinate of the rectangle to invalidate. 8799 * @param bottom The bottom coordinate of the rectangle to invalidate. 8800 * 8801 * @see #invalidate(int, int, int, int) 8802 * @see #invalidate(Rect) 8803 */ 8804 public void postInvalidate(int left, int top, int right, int bottom) { 8805 postInvalidateDelayed(0, left, top, right, bottom); 8806 } 8807 8808 /** 8809 * <p>Cause an invalidate to happen on a subsequent cycle through the event 8810 * loop. Waits for the specified amount of time.</p> 8811 * 8812 * <p>This method can be invoked from outside of the UI thread 8813 * only when this View is attached to a window.</p> 8814 * 8815 * @param delayMilliseconds the duration in milliseconds to delay the 8816 * invalidation by 8817 */ 8818 public void postInvalidateDelayed(long delayMilliseconds) { 8819 // We try only with the AttachInfo because there's no point in invalidating 8820 // if we are not attached to our window 8821 AttachInfo attachInfo = mAttachInfo; 8822 if (attachInfo != null) { 8823 Message msg = Message.obtain(); 8824 msg.what = AttachInfo.INVALIDATE_MSG; 8825 msg.obj = this; 8826 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8827 } 8828 } 8829 8830 /** 8831 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8832 * through the event loop. Waits for the specified amount of time.</p> 8833 * 8834 * <p>This method can be invoked from outside of the UI thread 8835 * only when this View is attached to a window.</p> 8836 * 8837 * @param delayMilliseconds the duration in milliseconds to delay the 8838 * invalidation by 8839 * @param left The left coordinate of the rectangle to invalidate. 8840 * @param top The top coordinate of the rectangle to invalidate. 8841 * @param right The right coordinate of the rectangle to invalidate. 8842 * @param bottom The bottom coordinate of the rectangle to invalidate. 8843 */ 8844 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8845 int right, int bottom) { 8846 8847 // We try only with the AttachInfo because there's no point in invalidating 8848 // if we are not attached to our window 8849 AttachInfo attachInfo = mAttachInfo; 8850 if (attachInfo != null) { 8851 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8852 info.target = this; 8853 info.left = left; 8854 info.top = top; 8855 info.right = right; 8856 info.bottom = bottom; 8857 8858 final Message msg = Message.obtain(); 8859 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 8860 msg.obj = info; 8861 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8862 } 8863 } 8864 8865 /** 8866 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 8867 * This event is sent at most once every 8868 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 8869 */ 8870 private void postSendViewScrolledAccessibilityEventCallback() { 8871 if (mSendViewScrolledAccessibilityEvent == null) { 8872 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 8873 } 8874 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 8875 mSendViewScrolledAccessibilityEvent.mIsPending = true; 8876 postDelayed(mSendViewScrolledAccessibilityEvent, 8877 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 8878 } 8879 } 8880 8881 /** 8882 * Called by a parent to request that a child update its values for mScrollX 8883 * and mScrollY if necessary. This will typically be done if the child is 8884 * animating a scroll using a {@link android.widget.Scroller Scroller} 8885 * object. 8886 */ 8887 public void computeScroll() { 8888 } 8889 8890 /** 8891 * <p>Indicate whether the horizontal edges are faded when the view is 8892 * scrolled horizontally.</p> 8893 * 8894 * @return true if the horizontal edges should are faded on scroll, false 8895 * otherwise 8896 * 8897 * @see #setHorizontalFadingEdgeEnabled(boolean) 8898 * @attr ref android.R.styleable#View_requiresFadingEdge 8899 */ 8900 public boolean isHorizontalFadingEdgeEnabled() { 8901 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 8902 } 8903 8904 /** 8905 * <p>Define whether the horizontal edges should be faded when this view 8906 * is scrolled horizontally.</p> 8907 * 8908 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 8909 * be faded when the view is scrolled 8910 * horizontally 8911 * 8912 * @see #isHorizontalFadingEdgeEnabled() 8913 * @attr ref android.R.styleable#View_requiresFadingEdge 8914 */ 8915 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 8916 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 8917 if (horizontalFadingEdgeEnabled) { 8918 initScrollCache(); 8919 } 8920 8921 mViewFlags ^= FADING_EDGE_HORIZONTAL; 8922 } 8923 } 8924 8925 /** 8926 * <p>Indicate whether the vertical edges are faded when the view is 8927 * scrolled horizontally.</p> 8928 * 8929 * @return true if the vertical edges should are faded on scroll, false 8930 * otherwise 8931 * 8932 * @see #setVerticalFadingEdgeEnabled(boolean) 8933 * @attr ref android.R.styleable#View_requiresFadingEdge 8934 */ 8935 public boolean isVerticalFadingEdgeEnabled() { 8936 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 8937 } 8938 8939 /** 8940 * <p>Define whether the vertical edges should be faded when this view 8941 * is scrolled vertically.</p> 8942 * 8943 * @param verticalFadingEdgeEnabled true if the vertical edges should 8944 * be faded when the view is scrolled 8945 * vertically 8946 * 8947 * @see #isVerticalFadingEdgeEnabled() 8948 * @attr ref android.R.styleable#View_requiresFadingEdge 8949 */ 8950 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 8951 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 8952 if (verticalFadingEdgeEnabled) { 8953 initScrollCache(); 8954 } 8955 8956 mViewFlags ^= FADING_EDGE_VERTICAL; 8957 } 8958 } 8959 8960 /** 8961 * Returns the strength, or intensity, of the top faded edge. The strength is 8962 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8963 * returns 0.0 or 1.0 but no value in between. 8964 * 8965 * Subclasses should override this method to provide a smoother fade transition 8966 * when scrolling occurs. 8967 * 8968 * @return the intensity of the top fade as a float between 0.0f and 1.0f 8969 */ 8970 protected float getTopFadingEdgeStrength() { 8971 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 8972 } 8973 8974 /** 8975 * Returns the strength, or intensity, of the bottom faded edge. The strength is 8976 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8977 * returns 0.0 or 1.0 but no value in between. 8978 * 8979 * Subclasses should override this method to provide a smoother fade transition 8980 * when scrolling occurs. 8981 * 8982 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 8983 */ 8984 protected float getBottomFadingEdgeStrength() { 8985 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 8986 computeVerticalScrollRange() ? 1.0f : 0.0f; 8987 } 8988 8989 /** 8990 * Returns the strength, or intensity, of the left faded edge. The strength is 8991 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8992 * returns 0.0 or 1.0 but no value in between. 8993 * 8994 * Subclasses should override this method to provide a smoother fade transition 8995 * when scrolling occurs. 8996 * 8997 * @return the intensity of the left fade as a float between 0.0f and 1.0f 8998 */ 8999 protected float getLeftFadingEdgeStrength() { 9000 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 9001 } 9002 9003 /** 9004 * Returns the strength, or intensity, of the right faded edge. The strength is 9005 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 9006 * returns 0.0 or 1.0 but no value in between. 9007 * 9008 * Subclasses should override this method to provide a smoother fade transition 9009 * when scrolling occurs. 9010 * 9011 * @return the intensity of the right fade as a float between 0.0f and 1.0f 9012 */ 9013 protected float getRightFadingEdgeStrength() { 9014 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 9015 computeHorizontalScrollRange() ? 1.0f : 0.0f; 9016 } 9017 9018 /** 9019 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 9020 * scrollbar is not drawn by default.</p> 9021 * 9022 * @return true if the horizontal scrollbar should be painted, false 9023 * otherwise 9024 * 9025 * @see #setHorizontalScrollBarEnabled(boolean) 9026 */ 9027 public boolean isHorizontalScrollBarEnabled() { 9028 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9029 } 9030 9031 /** 9032 * <p>Define whether the horizontal scrollbar should be drawn or not. The 9033 * scrollbar is not drawn by default.</p> 9034 * 9035 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 9036 * be painted 9037 * 9038 * @see #isHorizontalScrollBarEnabled() 9039 */ 9040 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 9041 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 9042 mViewFlags ^= SCROLLBARS_HORIZONTAL; 9043 computeOpaqueFlags(); 9044 resolvePadding(); 9045 } 9046 } 9047 9048 /** 9049 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 9050 * scrollbar is not drawn by default.</p> 9051 * 9052 * @return true if the vertical scrollbar should be painted, false 9053 * otherwise 9054 * 9055 * @see #setVerticalScrollBarEnabled(boolean) 9056 */ 9057 public boolean isVerticalScrollBarEnabled() { 9058 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 9059 } 9060 9061 /** 9062 * <p>Define whether the vertical scrollbar should be drawn or not. The 9063 * scrollbar is not drawn by default.</p> 9064 * 9065 * @param verticalScrollBarEnabled true if the vertical scrollbar should 9066 * be painted 9067 * 9068 * @see #isVerticalScrollBarEnabled() 9069 */ 9070 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 9071 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 9072 mViewFlags ^= SCROLLBARS_VERTICAL; 9073 computeOpaqueFlags(); 9074 resolvePadding(); 9075 } 9076 } 9077 9078 /** 9079 * @hide 9080 */ 9081 protected void recomputePadding() { 9082 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 9083 } 9084 9085 /** 9086 * Define whether scrollbars will fade when the view is not scrolling. 9087 * 9088 * @param fadeScrollbars wheter to enable fading 9089 * 9090 */ 9091 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 9092 initScrollCache(); 9093 final ScrollabilityCache scrollabilityCache = mScrollCache; 9094 scrollabilityCache.fadeScrollBars = fadeScrollbars; 9095 if (fadeScrollbars) { 9096 scrollabilityCache.state = ScrollabilityCache.OFF; 9097 } else { 9098 scrollabilityCache.state = ScrollabilityCache.ON; 9099 } 9100 } 9101 9102 /** 9103 * 9104 * Returns true if scrollbars will fade when this view is not scrolling 9105 * 9106 * @return true if scrollbar fading is enabled 9107 */ 9108 public boolean isScrollbarFadingEnabled() { 9109 return mScrollCache != null && mScrollCache.fadeScrollBars; 9110 } 9111 9112 /** 9113 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 9114 * inset. When inset, they add to the padding of the view. And the scrollbars 9115 * can be drawn inside the padding area or on the edge of the view. For example, 9116 * if a view has a background drawable and you want to draw the scrollbars 9117 * inside the padding specified by the drawable, you can use 9118 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 9119 * appear at the edge of the view, ignoring the padding, then you can use 9120 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 9121 * @param style the style of the scrollbars. Should be one of 9122 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 9123 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 9124 * @see #SCROLLBARS_INSIDE_OVERLAY 9125 * @see #SCROLLBARS_INSIDE_INSET 9126 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9127 * @see #SCROLLBARS_OUTSIDE_INSET 9128 */ 9129 public void setScrollBarStyle(int style) { 9130 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 9131 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 9132 computeOpaqueFlags(); 9133 resolvePadding(); 9134 } 9135 } 9136 9137 /** 9138 * <p>Returns the current scrollbar style.</p> 9139 * @return the current scrollbar style 9140 * @see #SCROLLBARS_INSIDE_OVERLAY 9141 * @see #SCROLLBARS_INSIDE_INSET 9142 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9143 * @see #SCROLLBARS_OUTSIDE_INSET 9144 */ 9145 @ViewDebug.ExportedProperty(mapping = { 9146 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 9147 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 9148 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 9149 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 9150 }) 9151 public int getScrollBarStyle() { 9152 return mViewFlags & SCROLLBARS_STYLE_MASK; 9153 } 9154 9155 /** 9156 * <p>Compute the horizontal range that the horizontal scrollbar 9157 * represents.</p> 9158 * 9159 * <p>The range is expressed in arbitrary units that must be the same as the 9160 * units used by {@link #computeHorizontalScrollExtent()} and 9161 * {@link #computeHorizontalScrollOffset()}.</p> 9162 * 9163 * <p>The default range is the drawing width of this view.</p> 9164 * 9165 * @return the total horizontal range represented by the horizontal 9166 * scrollbar 9167 * 9168 * @see #computeHorizontalScrollExtent() 9169 * @see #computeHorizontalScrollOffset() 9170 * @see android.widget.ScrollBarDrawable 9171 */ 9172 protected int computeHorizontalScrollRange() { 9173 return getWidth(); 9174 } 9175 9176 /** 9177 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 9178 * within the horizontal range. This value is used to compute the position 9179 * of the thumb within the scrollbar's track.</p> 9180 * 9181 * <p>The range is expressed in arbitrary units that must be the same as the 9182 * units used by {@link #computeHorizontalScrollRange()} and 9183 * {@link #computeHorizontalScrollExtent()}.</p> 9184 * 9185 * <p>The default offset is the scroll offset of this view.</p> 9186 * 9187 * @return the horizontal offset of the scrollbar's thumb 9188 * 9189 * @see #computeHorizontalScrollRange() 9190 * @see #computeHorizontalScrollExtent() 9191 * @see android.widget.ScrollBarDrawable 9192 */ 9193 protected int computeHorizontalScrollOffset() { 9194 return mScrollX; 9195 } 9196 9197 /** 9198 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 9199 * within the horizontal range. This value is used to compute the length 9200 * of the thumb within the scrollbar's track.</p> 9201 * 9202 * <p>The range is expressed in arbitrary units that must be the same as the 9203 * units used by {@link #computeHorizontalScrollRange()} and 9204 * {@link #computeHorizontalScrollOffset()}.</p> 9205 * 9206 * <p>The default extent is the drawing width of this view.</p> 9207 * 9208 * @return the horizontal extent of the scrollbar's thumb 9209 * 9210 * @see #computeHorizontalScrollRange() 9211 * @see #computeHorizontalScrollOffset() 9212 * @see android.widget.ScrollBarDrawable 9213 */ 9214 protected int computeHorizontalScrollExtent() { 9215 return getWidth(); 9216 } 9217 9218 /** 9219 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 9220 * 9221 * <p>The range is expressed in arbitrary units that must be the same as the 9222 * units used by {@link #computeVerticalScrollExtent()} and 9223 * {@link #computeVerticalScrollOffset()}.</p> 9224 * 9225 * @return the total vertical range represented by the vertical scrollbar 9226 * 9227 * <p>The default range is the drawing height of this view.</p> 9228 * 9229 * @see #computeVerticalScrollExtent() 9230 * @see #computeVerticalScrollOffset() 9231 * @see android.widget.ScrollBarDrawable 9232 */ 9233 protected int computeVerticalScrollRange() { 9234 return getHeight(); 9235 } 9236 9237 /** 9238 * <p>Compute the vertical offset of the vertical scrollbar's thumb 9239 * within the horizontal range. This value is used to compute the position 9240 * of the thumb within the scrollbar's track.</p> 9241 * 9242 * <p>The range is expressed in arbitrary units that must be the same as the 9243 * units used by {@link #computeVerticalScrollRange()} and 9244 * {@link #computeVerticalScrollExtent()}.</p> 9245 * 9246 * <p>The default offset is the scroll offset of this view.</p> 9247 * 9248 * @return the vertical offset of the scrollbar's thumb 9249 * 9250 * @see #computeVerticalScrollRange() 9251 * @see #computeVerticalScrollExtent() 9252 * @see android.widget.ScrollBarDrawable 9253 */ 9254 protected int computeVerticalScrollOffset() { 9255 return mScrollY; 9256 } 9257 9258 /** 9259 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 9260 * within the vertical range. This value is used to compute the length 9261 * of the thumb within the scrollbar's track.</p> 9262 * 9263 * <p>The range is expressed in arbitrary units that must be the same as the 9264 * units used by {@link #computeVerticalScrollRange()} and 9265 * {@link #computeVerticalScrollOffset()}.</p> 9266 * 9267 * <p>The default extent is the drawing height of this view.</p> 9268 * 9269 * @return the vertical extent of the scrollbar's thumb 9270 * 9271 * @see #computeVerticalScrollRange() 9272 * @see #computeVerticalScrollOffset() 9273 * @see android.widget.ScrollBarDrawable 9274 */ 9275 protected int computeVerticalScrollExtent() { 9276 return getHeight(); 9277 } 9278 9279 /** 9280 * Check if this view can be scrolled horizontally in a certain direction. 9281 * 9282 * @param direction Negative to check scrolling left, positive to check scrolling right. 9283 * @return true if this view can be scrolled in the specified direction, false otherwise. 9284 */ 9285 public boolean canScrollHorizontally(int direction) { 9286 final int offset = computeHorizontalScrollOffset(); 9287 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 9288 if (range == 0) return false; 9289 if (direction < 0) { 9290 return offset > 0; 9291 } else { 9292 return offset < range - 1; 9293 } 9294 } 9295 9296 /** 9297 * Check if this view can be scrolled vertically in a certain direction. 9298 * 9299 * @param direction Negative to check scrolling up, positive to check scrolling down. 9300 * @return true if this view can be scrolled in the specified direction, false otherwise. 9301 */ 9302 public boolean canScrollVertically(int direction) { 9303 final int offset = computeVerticalScrollOffset(); 9304 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 9305 if (range == 0) return false; 9306 if (direction < 0) { 9307 return offset > 0; 9308 } else { 9309 return offset < range - 1; 9310 } 9311 } 9312 9313 /** 9314 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 9315 * scrollbars are painted only if they have been awakened first.</p> 9316 * 9317 * @param canvas the canvas on which to draw the scrollbars 9318 * 9319 * @see #awakenScrollBars(int) 9320 */ 9321 protected final void onDrawScrollBars(Canvas canvas) { 9322 // scrollbars are drawn only when the animation is running 9323 final ScrollabilityCache cache = mScrollCache; 9324 if (cache != null) { 9325 9326 int state = cache.state; 9327 9328 if (state == ScrollabilityCache.OFF) { 9329 return; 9330 } 9331 9332 boolean invalidate = false; 9333 9334 if (state == ScrollabilityCache.FADING) { 9335 // We're fading -- get our fade interpolation 9336 if (cache.interpolatorValues == null) { 9337 cache.interpolatorValues = new float[1]; 9338 } 9339 9340 float[] values = cache.interpolatorValues; 9341 9342 // Stops the animation if we're done 9343 if (cache.scrollBarInterpolator.timeToValues(values) == 9344 Interpolator.Result.FREEZE_END) { 9345 cache.state = ScrollabilityCache.OFF; 9346 } else { 9347 cache.scrollBar.setAlpha(Math.round(values[0])); 9348 } 9349 9350 // This will make the scroll bars inval themselves after 9351 // drawing. We only want this when we're fading so that 9352 // we prevent excessive redraws 9353 invalidate = true; 9354 } else { 9355 // We're just on -- but we may have been fading before so 9356 // reset alpha 9357 cache.scrollBar.setAlpha(255); 9358 } 9359 9360 9361 final int viewFlags = mViewFlags; 9362 9363 final boolean drawHorizontalScrollBar = 9364 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9365 final boolean drawVerticalScrollBar = 9366 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 9367 && !isVerticalScrollBarHidden(); 9368 9369 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 9370 final int width = mRight - mLeft; 9371 final int height = mBottom - mTop; 9372 9373 final ScrollBarDrawable scrollBar = cache.scrollBar; 9374 9375 final int scrollX = mScrollX; 9376 final int scrollY = mScrollY; 9377 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 9378 9379 int left, top, right, bottom; 9380 9381 if (drawHorizontalScrollBar) { 9382 int size = scrollBar.getSize(false); 9383 if (size <= 0) { 9384 size = cache.scrollBarSize; 9385 } 9386 9387 scrollBar.setParameters(computeHorizontalScrollRange(), 9388 computeHorizontalScrollOffset(), 9389 computeHorizontalScrollExtent(), false); 9390 final int verticalScrollBarGap = drawVerticalScrollBar ? 9391 getVerticalScrollbarWidth() : 0; 9392 top = scrollY + height - size - (mUserPaddingBottom & inside); 9393 left = scrollX + (mPaddingLeft & inside); 9394 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 9395 bottom = top + size; 9396 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 9397 if (invalidate) { 9398 invalidate(left, top, right, bottom); 9399 } 9400 } 9401 9402 if (drawVerticalScrollBar) { 9403 int size = scrollBar.getSize(true); 9404 if (size <= 0) { 9405 size = cache.scrollBarSize; 9406 } 9407 9408 scrollBar.setParameters(computeVerticalScrollRange(), 9409 computeVerticalScrollOffset(), 9410 computeVerticalScrollExtent(), true); 9411 switch (mVerticalScrollbarPosition) { 9412 default: 9413 case SCROLLBAR_POSITION_DEFAULT: 9414 case SCROLLBAR_POSITION_RIGHT: 9415 left = scrollX + width - size - (mUserPaddingRight & inside); 9416 break; 9417 case SCROLLBAR_POSITION_LEFT: 9418 left = scrollX + (mUserPaddingLeft & inside); 9419 break; 9420 } 9421 top = scrollY + (mPaddingTop & inside); 9422 right = left + size; 9423 bottom = scrollY + height - (mUserPaddingBottom & inside); 9424 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 9425 if (invalidate) { 9426 invalidate(left, top, right, bottom); 9427 } 9428 } 9429 } 9430 } 9431 } 9432 9433 /** 9434 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 9435 * FastScroller is visible. 9436 * @return whether to temporarily hide the vertical scrollbar 9437 * @hide 9438 */ 9439 protected boolean isVerticalScrollBarHidden() { 9440 return false; 9441 } 9442 9443 /** 9444 * <p>Draw the horizontal scrollbar if 9445 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 9446 * 9447 * @param canvas the canvas on which to draw the scrollbar 9448 * @param scrollBar the scrollbar's drawable 9449 * 9450 * @see #isHorizontalScrollBarEnabled() 9451 * @see #computeHorizontalScrollRange() 9452 * @see #computeHorizontalScrollExtent() 9453 * @see #computeHorizontalScrollOffset() 9454 * @see android.widget.ScrollBarDrawable 9455 * @hide 9456 */ 9457 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 9458 int l, int t, int r, int b) { 9459 scrollBar.setBounds(l, t, r, b); 9460 scrollBar.draw(canvas); 9461 } 9462 9463 /** 9464 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 9465 * returns true.</p> 9466 * 9467 * @param canvas the canvas on which to draw the scrollbar 9468 * @param scrollBar the scrollbar's drawable 9469 * 9470 * @see #isVerticalScrollBarEnabled() 9471 * @see #computeVerticalScrollRange() 9472 * @see #computeVerticalScrollExtent() 9473 * @see #computeVerticalScrollOffset() 9474 * @see android.widget.ScrollBarDrawable 9475 * @hide 9476 */ 9477 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 9478 int l, int t, int r, int b) { 9479 scrollBar.setBounds(l, t, r, b); 9480 scrollBar.draw(canvas); 9481 } 9482 9483 /** 9484 * Implement this to do your drawing. 9485 * 9486 * @param canvas the canvas on which the background will be drawn 9487 */ 9488 protected void onDraw(Canvas canvas) { 9489 } 9490 9491 /* 9492 * Caller is responsible for calling requestLayout if necessary. 9493 * (This allows addViewInLayout to not request a new layout.) 9494 */ 9495 void assignParent(ViewParent parent) { 9496 if (mParent == null) { 9497 mParent = parent; 9498 } else if (parent == null) { 9499 mParent = null; 9500 } else { 9501 throw new RuntimeException("view " + this + " being added, but" 9502 + " it already has a parent"); 9503 } 9504 } 9505 9506 /** 9507 * This is called when the view is attached to a window. At this point it 9508 * has a Surface and will start drawing. Note that this function is 9509 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 9510 * however it may be called any time before the first onDraw -- including 9511 * before or after {@link #onMeasure(int, int)}. 9512 * 9513 * @see #onDetachedFromWindow() 9514 */ 9515 protected void onAttachedToWindow() { 9516 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 9517 mParent.requestTransparentRegion(this); 9518 } 9519 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 9520 initialAwakenScrollBars(); 9521 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 9522 } 9523 jumpDrawablesToCurrentState(); 9524 // Order is important here: LayoutDirection MUST be resolved before Padding 9525 // and TextDirection 9526 resolveLayoutDirectionIfNeeded(); 9527 resolvePadding(); 9528 resolveTextDirection(); 9529 if (isFocused()) { 9530 InputMethodManager imm = InputMethodManager.peekInstance(); 9531 imm.focusIn(this); 9532 } 9533 } 9534 9535 /** 9536 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 9537 * that the parent directionality can and will be resolved before its children. 9538 */ 9539 private void resolveLayoutDirectionIfNeeded() { 9540 // Do not resolve if it is not needed 9541 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return; 9542 9543 // Clear any previous layout direction resolution 9544 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_RTL; 9545 9546 // Reset also TextDirection as a change into LayoutDirection may impact the selected 9547 // TextDirectionHeuristic 9548 resetResolvedTextDirection(); 9549 9550 // Set resolved depending on layout direction 9551 switch (getLayoutDirection()) { 9552 case LAYOUT_DIRECTION_INHERIT: 9553 // We cannot do the resolution if there is no parent 9554 if (mParent == null) return; 9555 9556 // If this is root view, no need to look at parent's layout dir. 9557 if (mParent instanceof ViewGroup) { 9558 ViewGroup viewGroup = ((ViewGroup) mParent); 9559 9560 // Check if the parent view group can resolve 9561 if (! viewGroup.canResolveLayoutDirection()) { 9562 return; 9563 } 9564 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 9565 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9566 } 9567 } 9568 break; 9569 case LAYOUT_DIRECTION_RTL: 9570 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9571 break; 9572 case LAYOUT_DIRECTION_LOCALE: 9573 if(isLayoutDirectionRtl(Locale.getDefault())) { 9574 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9575 } 9576 break; 9577 default: 9578 // Nothing to do, LTR by default 9579 } 9580 9581 // Set to resolved 9582 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 9583 } 9584 9585 /** 9586 * @hide 9587 */ 9588 protected void resolvePadding() { 9589 // If the user specified the absolute padding (either with android:padding or 9590 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 9591 // use the default padding or the padding from the background drawable 9592 // (stored at this point in mPadding*) 9593 switch (getResolvedLayoutDirection()) { 9594 case LAYOUT_DIRECTION_RTL: 9595 // Start user padding override Right user padding. Otherwise, if Right user 9596 // padding is not defined, use the default Right padding. If Right user padding 9597 // is defined, just use it. 9598 if (mUserPaddingStart >= 0) { 9599 mUserPaddingRight = mUserPaddingStart; 9600 } else if (mUserPaddingRight < 0) { 9601 mUserPaddingRight = mPaddingRight; 9602 } 9603 if (mUserPaddingEnd >= 0) { 9604 mUserPaddingLeft = mUserPaddingEnd; 9605 } else if (mUserPaddingLeft < 0) { 9606 mUserPaddingLeft = mPaddingLeft; 9607 } 9608 break; 9609 case LAYOUT_DIRECTION_LTR: 9610 default: 9611 // Start user padding override Left user padding. Otherwise, if Left user 9612 // padding is not defined, use the default left padding. If Left user padding 9613 // is defined, just use it. 9614 if (mUserPaddingStart >= 0) { 9615 mUserPaddingLeft = mUserPaddingStart; 9616 } else if (mUserPaddingLeft < 0) { 9617 mUserPaddingLeft = mPaddingLeft; 9618 } 9619 if (mUserPaddingEnd >= 0) { 9620 mUserPaddingRight = mUserPaddingEnd; 9621 } else if (mUserPaddingRight < 0) { 9622 mUserPaddingRight = mPaddingRight; 9623 } 9624 } 9625 9626 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 9627 9628 recomputePadding(); 9629 } 9630 9631 /** 9632 * Return true if layout direction resolution can be done 9633 * 9634 * @hide 9635 */ 9636 protected boolean canResolveLayoutDirection() { 9637 switch (getLayoutDirection()) { 9638 case LAYOUT_DIRECTION_INHERIT: 9639 return (mParent != null); 9640 default: 9641 return true; 9642 } 9643 } 9644 9645 /** 9646 * Reset the resolved layout direction. 9647 * 9648 * Subclasses need to override this method to clear cached information that depends on the 9649 * resolved layout direction, or to inform child views that inherit their layout direction. 9650 * Overrides must also call the superclass implementation at the start of their implementation. 9651 * 9652 * @hide 9653 */ 9654 protected void resetResolvedLayoutDirection() { 9655 // Reset the current View resolution 9656 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED; 9657 } 9658 9659 /** 9660 * Check if a Locale is corresponding to a RTL script. 9661 * 9662 * @param locale Locale to check 9663 * @return true if a Locale is corresponding to a RTL script. 9664 * 9665 * @hide 9666 */ 9667 protected static boolean isLayoutDirectionRtl(Locale locale) { 9668 return (LocaleUtil.TEXT_LAYOUT_DIRECTION_RTL_DO_NOT_USE == 9669 LocaleUtil.getLayoutDirectionFromLocale(locale)); 9670 } 9671 9672 /** 9673 * This is called when the view is detached from a window. At this point it 9674 * no longer has a surface for drawing. 9675 * 9676 * @see #onAttachedToWindow() 9677 */ 9678 protected void onDetachedFromWindow() { 9679 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 9680 9681 removeUnsetPressCallback(); 9682 removeLongPressCallback(); 9683 removePerformClickCallback(); 9684 removeSendViewScrolledAccessibilityEventCallback(); 9685 9686 destroyDrawingCache(); 9687 9688 destroyLayer(); 9689 9690 if (mDisplayList != null) { 9691 mDisplayList.invalidate(); 9692 } 9693 9694 if (mAttachInfo != null) { 9695 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 9696 } 9697 9698 mCurrentAnimation = null; 9699 9700 resetResolvedLayoutDirection(); 9701 resetResolvedTextDirection(); 9702 } 9703 9704 /** 9705 * @return The number of times this view has been attached to a window 9706 */ 9707 protected int getWindowAttachCount() { 9708 return mWindowAttachCount; 9709 } 9710 9711 /** 9712 * Retrieve a unique token identifying the window this view is attached to. 9713 * @return Return the window's token for use in 9714 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 9715 */ 9716 public IBinder getWindowToken() { 9717 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 9718 } 9719 9720 /** 9721 * Retrieve a unique token identifying the top-level "real" window of 9722 * the window that this view is attached to. That is, this is like 9723 * {@link #getWindowToken}, except if the window this view in is a panel 9724 * window (attached to another containing window), then the token of 9725 * the containing window is returned instead. 9726 * 9727 * @return Returns the associated window token, either 9728 * {@link #getWindowToken()} or the containing window's token. 9729 */ 9730 public IBinder getApplicationWindowToken() { 9731 AttachInfo ai = mAttachInfo; 9732 if (ai != null) { 9733 IBinder appWindowToken = ai.mPanelParentWindowToken; 9734 if (appWindowToken == null) { 9735 appWindowToken = ai.mWindowToken; 9736 } 9737 return appWindowToken; 9738 } 9739 return null; 9740 } 9741 9742 /** 9743 * Retrieve private session object this view hierarchy is using to 9744 * communicate with the window manager. 9745 * @return the session object to communicate with the window manager 9746 */ 9747 /*package*/ IWindowSession getWindowSession() { 9748 return mAttachInfo != null ? mAttachInfo.mSession : null; 9749 } 9750 9751 /** 9752 * @param info the {@link android.view.View.AttachInfo} to associated with 9753 * this view 9754 */ 9755 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 9756 //System.out.println("Attached! " + this); 9757 mAttachInfo = info; 9758 mWindowAttachCount++; 9759 // We will need to evaluate the drawable state at least once. 9760 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9761 if (mFloatingTreeObserver != null) { 9762 info.mTreeObserver.merge(mFloatingTreeObserver); 9763 mFloatingTreeObserver = null; 9764 } 9765 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 9766 mAttachInfo.mScrollContainers.add(this); 9767 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 9768 } 9769 performCollectViewAttributes(visibility); 9770 onAttachedToWindow(); 9771 9772 ListenerInfo li = mListenerInfo; 9773 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9774 li != null ? li.mOnAttachStateChangeListeners : null; 9775 if (listeners != null && listeners.size() > 0) { 9776 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9777 // perform the dispatching. The iterator is a safe guard against listeners that 9778 // could mutate the list by calling the various add/remove methods. This prevents 9779 // the array from being modified while we iterate it. 9780 for (OnAttachStateChangeListener listener : listeners) { 9781 listener.onViewAttachedToWindow(this); 9782 } 9783 } 9784 9785 int vis = info.mWindowVisibility; 9786 if (vis != GONE) { 9787 onWindowVisibilityChanged(vis); 9788 } 9789 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 9790 // If nobody has evaluated the drawable state yet, then do it now. 9791 refreshDrawableState(); 9792 } 9793 } 9794 9795 void dispatchDetachedFromWindow() { 9796 AttachInfo info = mAttachInfo; 9797 if (info != null) { 9798 int vis = info.mWindowVisibility; 9799 if (vis != GONE) { 9800 onWindowVisibilityChanged(GONE); 9801 } 9802 } 9803 9804 onDetachedFromWindow(); 9805 9806 ListenerInfo li = mListenerInfo; 9807 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9808 li != null ? li.mOnAttachStateChangeListeners : null; 9809 if (listeners != null && listeners.size() > 0) { 9810 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9811 // perform the dispatching. The iterator is a safe guard against listeners that 9812 // could mutate the list by calling the various add/remove methods. This prevents 9813 // the array from being modified while we iterate it. 9814 for (OnAttachStateChangeListener listener : listeners) { 9815 listener.onViewDetachedFromWindow(this); 9816 } 9817 } 9818 9819 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 9820 mAttachInfo.mScrollContainers.remove(this); 9821 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 9822 } 9823 9824 mAttachInfo = null; 9825 } 9826 9827 /** 9828 * Store this view hierarchy's frozen state into the given container. 9829 * 9830 * @param container The SparseArray in which to save the view's state. 9831 * 9832 * @see #restoreHierarchyState(android.util.SparseArray) 9833 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9834 * @see #onSaveInstanceState() 9835 */ 9836 public void saveHierarchyState(SparseArray<Parcelable> container) { 9837 dispatchSaveInstanceState(container); 9838 } 9839 9840 /** 9841 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 9842 * this view and its children. May be overridden to modify how freezing happens to a 9843 * view's children; for example, some views may want to not store state for their children. 9844 * 9845 * @param container The SparseArray in which to save the view's state. 9846 * 9847 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9848 * @see #saveHierarchyState(android.util.SparseArray) 9849 * @see #onSaveInstanceState() 9850 */ 9851 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 9852 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 9853 mPrivateFlags &= ~SAVE_STATE_CALLED; 9854 Parcelable state = onSaveInstanceState(); 9855 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9856 throw new IllegalStateException( 9857 "Derived class did not call super.onSaveInstanceState()"); 9858 } 9859 if (state != null) { 9860 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 9861 // + ": " + state); 9862 container.put(mID, state); 9863 } 9864 } 9865 } 9866 9867 /** 9868 * Hook allowing a view to generate a representation of its internal state 9869 * that can later be used to create a new instance with that same state. 9870 * This state should only contain information that is not persistent or can 9871 * not be reconstructed later. For example, you will never store your 9872 * current position on screen because that will be computed again when a 9873 * new instance of the view is placed in its view hierarchy. 9874 * <p> 9875 * Some examples of things you may store here: the current cursor position 9876 * in a text view (but usually not the text itself since that is stored in a 9877 * content provider or other persistent storage), the currently selected 9878 * item in a list view. 9879 * 9880 * @return Returns a Parcelable object containing the view's current dynamic 9881 * state, or null if there is nothing interesting to save. The 9882 * default implementation returns null. 9883 * @see #onRestoreInstanceState(android.os.Parcelable) 9884 * @see #saveHierarchyState(android.util.SparseArray) 9885 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9886 * @see #setSaveEnabled(boolean) 9887 */ 9888 protected Parcelable onSaveInstanceState() { 9889 mPrivateFlags |= SAVE_STATE_CALLED; 9890 return BaseSavedState.EMPTY_STATE; 9891 } 9892 9893 /** 9894 * Restore this view hierarchy's frozen state from the given container. 9895 * 9896 * @param container The SparseArray which holds previously frozen states. 9897 * 9898 * @see #saveHierarchyState(android.util.SparseArray) 9899 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9900 * @see #onRestoreInstanceState(android.os.Parcelable) 9901 */ 9902 public void restoreHierarchyState(SparseArray<Parcelable> container) { 9903 dispatchRestoreInstanceState(container); 9904 } 9905 9906 /** 9907 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 9908 * state for this view and its children. May be overridden to modify how restoring 9909 * happens to a view's children; for example, some views may want to not store state 9910 * for their children. 9911 * 9912 * @param container The SparseArray which holds previously saved state. 9913 * 9914 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9915 * @see #restoreHierarchyState(android.util.SparseArray) 9916 * @see #onRestoreInstanceState(android.os.Parcelable) 9917 */ 9918 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 9919 if (mID != NO_ID) { 9920 Parcelable state = container.get(mID); 9921 if (state != null) { 9922 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 9923 // + ": " + state); 9924 mPrivateFlags &= ~SAVE_STATE_CALLED; 9925 onRestoreInstanceState(state); 9926 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9927 throw new IllegalStateException( 9928 "Derived class did not call super.onRestoreInstanceState()"); 9929 } 9930 } 9931 } 9932 } 9933 9934 /** 9935 * Hook allowing a view to re-apply a representation of its internal state that had previously 9936 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 9937 * null state. 9938 * 9939 * @param state The frozen state that had previously been returned by 9940 * {@link #onSaveInstanceState}. 9941 * 9942 * @see #onSaveInstanceState() 9943 * @see #restoreHierarchyState(android.util.SparseArray) 9944 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9945 */ 9946 protected void onRestoreInstanceState(Parcelable state) { 9947 mPrivateFlags |= SAVE_STATE_CALLED; 9948 if (state != BaseSavedState.EMPTY_STATE && state != null) { 9949 throw new IllegalArgumentException("Wrong state class, expecting View State but " 9950 + "received " + state.getClass().toString() + " instead. This usually happens " 9951 + "when two views of different type have the same id in the same hierarchy. " 9952 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 9953 + "other views do not use the same id."); 9954 } 9955 } 9956 9957 /** 9958 * <p>Return the time at which the drawing of the view hierarchy started.</p> 9959 * 9960 * @return the drawing start time in milliseconds 9961 */ 9962 public long getDrawingTime() { 9963 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 9964 } 9965 9966 /** 9967 * <p>Enables or disables the duplication of the parent's state into this view. When 9968 * duplication is enabled, this view gets its drawable state from its parent rather 9969 * than from its own internal properties.</p> 9970 * 9971 * <p>Note: in the current implementation, setting this property to true after the 9972 * view was added to a ViewGroup might have no effect at all. This property should 9973 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 9974 * 9975 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 9976 * property is enabled, an exception will be thrown.</p> 9977 * 9978 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 9979 * parent, these states should not be affected by this method.</p> 9980 * 9981 * @param enabled True to enable duplication of the parent's drawable state, false 9982 * to disable it. 9983 * 9984 * @see #getDrawableState() 9985 * @see #isDuplicateParentStateEnabled() 9986 */ 9987 public void setDuplicateParentStateEnabled(boolean enabled) { 9988 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 9989 } 9990 9991 /** 9992 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 9993 * 9994 * @return True if this view's drawable state is duplicated from the parent, 9995 * false otherwise 9996 * 9997 * @see #getDrawableState() 9998 * @see #setDuplicateParentStateEnabled(boolean) 9999 */ 10000 public boolean isDuplicateParentStateEnabled() { 10001 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 10002 } 10003 10004 /** 10005 * <p>Specifies the type of layer backing this view. The layer can be 10006 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 10007 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 10008 * 10009 * <p>A layer is associated with an optional {@link android.graphics.Paint} 10010 * instance that controls how the layer is composed on screen. The following 10011 * properties of the paint are taken into account when composing the layer:</p> 10012 * <ul> 10013 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 10014 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 10015 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 10016 * </ul> 10017 * 10018 * <p>If this view has an alpha value set to < 1.0 by calling 10019 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 10020 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 10021 * equivalent to setting a hardware layer on this view and providing a paint with 10022 * the desired alpha value.<p> 10023 * 10024 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 10025 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 10026 * for more information on when and how to use layers.</p> 10027 * 10028 * @param layerType The ype of layer to use with this view, must be one of 10029 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10030 * {@link #LAYER_TYPE_HARDWARE} 10031 * @param paint The paint used to compose the layer. This argument is optional 10032 * and can be null. It is ignored when the layer type is 10033 * {@link #LAYER_TYPE_NONE} 10034 * 10035 * @see #getLayerType() 10036 * @see #LAYER_TYPE_NONE 10037 * @see #LAYER_TYPE_SOFTWARE 10038 * @see #LAYER_TYPE_HARDWARE 10039 * @see #setAlpha(float) 10040 * 10041 * @attr ref android.R.styleable#View_layerType 10042 */ 10043 public void setLayerType(int layerType, Paint paint) { 10044 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 10045 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 10046 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 10047 } 10048 10049 if (layerType == mLayerType) { 10050 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 10051 mLayerPaint = paint == null ? new Paint() : paint; 10052 invalidateParentCaches(); 10053 invalidate(true); 10054 } 10055 return; 10056 } 10057 10058 // Destroy any previous software drawing cache if needed 10059 switch (mLayerType) { 10060 case LAYER_TYPE_HARDWARE: 10061 destroyLayer(); 10062 // fall through - non-accelerated views may use software layer mechanism instead 10063 case LAYER_TYPE_SOFTWARE: 10064 destroyDrawingCache(); 10065 break; 10066 default: 10067 break; 10068 } 10069 10070 mLayerType = layerType; 10071 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 10072 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 10073 mLocalDirtyRect = layerDisabled ? null : new Rect(); 10074 10075 invalidateParentCaches(); 10076 invalidate(true); 10077 } 10078 10079 /** 10080 * Indicates whether this view has a static layer. A view with layer type 10081 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 10082 * dynamic. 10083 */ 10084 boolean hasStaticLayer() { 10085 return mLayerType == LAYER_TYPE_NONE; 10086 } 10087 10088 /** 10089 * Indicates what type of layer is currently associated with this view. By default 10090 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 10091 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 10092 * for more information on the different types of layers. 10093 * 10094 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10095 * {@link #LAYER_TYPE_HARDWARE} 10096 * 10097 * @see #setLayerType(int, android.graphics.Paint) 10098 * @see #buildLayer() 10099 * @see #LAYER_TYPE_NONE 10100 * @see #LAYER_TYPE_SOFTWARE 10101 * @see #LAYER_TYPE_HARDWARE 10102 */ 10103 public int getLayerType() { 10104 return mLayerType; 10105 } 10106 10107 /** 10108 * Forces this view's layer to be created and this view to be rendered 10109 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 10110 * invoking this method will have no effect. 10111 * 10112 * This method can for instance be used to render a view into its layer before 10113 * starting an animation. If this view is complex, rendering into the layer 10114 * before starting the animation will avoid skipping frames. 10115 * 10116 * @throws IllegalStateException If this view is not attached to a window 10117 * 10118 * @see #setLayerType(int, android.graphics.Paint) 10119 */ 10120 public void buildLayer() { 10121 if (mLayerType == LAYER_TYPE_NONE) return; 10122 10123 if (mAttachInfo == null) { 10124 throw new IllegalStateException("This view must be attached to a window first"); 10125 } 10126 10127 switch (mLayerType) { 10128 case LAYER_TYPE_HARDWARE: 10129 if (mAttachInfo.mHardwareRenderer != null && 10130 mAttachInfo.mHardwareRenderer.isEnabled() && 10131 mAttachInfo.mHardwareRenderer.validate()) { 10132 getHardwareLayer(); 10133 } 10134 break; 10135 case LAYER_TYPE_SOFTWARE: 10136 buildDrawingCache(true); 10137 break; 10138 } 10139 } 10140 10141 // Make sure the HardwareRenderer.validate() was invoked before calling this method 10142 void flushLayer() { 10143 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 10144 mHardwareLayer.flush(); 10145 } 10146 } 10147 10148 /** 10149 * <p>Returns a hardware layer that can be used to draw this view again 10150 * without executing its draw method.</p> 10151 * 10152 * @return A HardwareLayer ready to render, or null if an error occurred. 10153 */ 10154 HardwareLayer getHardwareLayer() { 10155 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 10156 !mAttachInfo.mHardwareRenderer.isEnabled()) { 10157 return null; 10158 } 10159 10160 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 10161 10162 final int width = mRight - mLeft; 10163 final int height = mBottom - mTop; 10164 10165 if (width == 0 || height == 0) { 10166 return null; 10167 } 10168 10169 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 10170 if (mHardwareLayer == null) { 10171 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 10172 width, height, isOpaque()); 10173 mLocalDirtyRect.setEmpty(); 10174 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 10175 mHardwareLayer.resize(width, height); 10176 mLocalDirtyRect.setEmpty(); 10177 } 10178 10179 // The layer is not valid if the underlying GPU resources cannot be allocated 10180 if (!mHardwareLayer.isValid()) { 10181 return null; 10182 } 10183 10184 HardwareCanvas currentCanvas = mAttachInfo.mHardwareCanvas; 10185 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 10186 10187 // Make sure all the GPU resources have been properly allocated 10188 if (canvas == null) { 10189 mHardwareLayer.end(currentCanvas); 10190 return null; 10191 } 10192 10193 mAttachInfo.mHardwareCanvas = canvas; 10194 try { 10195 canvas.setViewport(width, height); 10196 canvas.onPreDraw(mLocalDirtyRect); 10197 mLocalDirtyRect.setEmpty(); 10198 10199 final int restoreCount = canvas.save(); 10200 10201 computeScroll(); 10202 canvas.translate(-mScrollX, -mScrollY); 10203 10204 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10205 10206 // Fast path for layouts with no backgrounds 10207 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10208 mPrivateFlags &= ~DIRTY_MASK; 10209 dispatchDraw(canvas); 10210 } else { 10211 draw(canvas); 10212 } 10213 10214 canvas.restoreToCount(restoreCount); 10215 } finally { 10216 canvas.onPostDraw(); 10217 mHardwareLayer.end(currentCanvas); 10218 mAttachInfo.mHardwareCanvas = currentCanvas; 10219 } 10220 } 10221 10222 return mHardwareLayer; 10223 } 10224 10225 /** 10226 * Destroys this View's hardware layer if possible. 10227 * 10228 * @return True if the layer was destroyed, false otherwise. 10229 * 10230 * @see #setLayerType(int, android.graphics.Paint) 10231 * @see #LAYER_TYPE_HARDWARE 10232 */ 10233 boolean destroyLayer() { 10234 if (mHardwareLayer != null) { 10235 AttachInfo info = mAttachInfo; 10236 if (info != null && info.mHardwareRenderer != null && 10237 info.mHardwareRenderer.isEnabled() && info.mHardwareRenderer.validate()) { 10238 mHardwareLayer.destroy(); 10239 mHardwareLayer = null; 10240 10241 invalidate(true); 10242 invalidateParentCaches(); 10243 } 10244 return true; 10245 } 10246 return false; 10247 } 10248 10249 /** 10250 * Destroys all hardware rendering resources. This method is invoked 10251 * when the system needs to reclaim resources. Upon execution of this 10252 * method, you should free any OpenGL resources created by the view. 10253 * 10254 * Note: you <strong>must</strong> call 10255 * <code>super.destroyHardwareResources()</code> when overriding 10256 * this method. 10257 * 10258 * @hide 10259 */ 10260 protected void destroyHardwareResources() { 10261 destroyLayer(); 10262 } 10263 10264 /** 10265 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 10266 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 10267 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 10268 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 10269 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 10270 * null.</p> 10271 * 10272 * <p>Enabling the drawing cache is similar to 10273 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 10274 * acceleration is turned off. When hardware acceleration is turned on, enabling the 10275 * drawing cache has no effect on rendering because the system uses a different mechanism 10276 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 10277 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 10278 * for information on how to enable software and hardware layers.</p> 10279 * 10280 * <p>This API can be used to manually generate 10281 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 10282 * {@link #getDrawingCache()}.</p> 10283 * 10284 * @param enabled true to enable the drawing cache, false otherwise 10285 * 10286 * @see #isDrawingCacheEnabled() 10287 * @see #getDrawingCache() 10288 * @see #buildDrawingCache() 10289 * @see #setLayerType(int, android.graphics.Paint) 10290 */ 10291 public void setDrawingCacheEnabled(boolean enabled) { 10292 mCachingFailed = false; 10293 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 10294 } 10295 10296 /** 10297 * <p>Indicates whether the drawing cache is enabled for this view.</p> 10298 * 10299 * @return true if the drawing cache is enabled 10300 * 10301 * @see #setDrawingCacheEnabled(boolean) 10302 * @see #getDrawingCache() 10303 */ 10304 @ViewDebug.ExportedProperty(category = "drawing") 10305 public boolean isDrawingCacheEnabled() { 10306 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 10307 } 10308 10309 /** 10310 * Debugging utility which recursively outputs the dirty state of a view and its 10311 * descendants. 10312 * 10313 * @hide 10314 */ 10315 @SuppressWarnings({"UnusedDeclaration"}) 10316 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 10317 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 10318 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 10319 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 10320 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 10321 if (clear) { 10322 mPrivateFlags &= clearMask; 10323 } 10324 if (this instanceof ViewGroup) { 10325 ViewGroup parent = (ViewGroup) this; 10326 final int count = parent.getChildCount(); 10327 for (int i = 0; i < count; i++) { 10328 final View child = parent.getChildAt(i); 10329 child.outputDirtyFlags(indent + " ", clear, clearMask); 10330 } 10331 } 10332 } 10333 10334 /** 10335 * This method is used by ViewGroup to cause its children to restore or recreate their 10336 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 10337 * to recreate its own display list, which would happen if it went through the normal 10338 * draw/dispatchDraw mechanisms. 10339 * 10340 * @hide 10341 */ 10342 protected void dispatchGetDisplayList() {} 10343 10344 /** 10345 * A view that is not attached or hardware accelerated cannot create a display list. 10346 * This method checks these conditions and returns the appropriate result. 10347 * 10348 * @return true if view has the ability to create a display list, false otherwise. 10349 * 10350 * @hide 10351 */ 10352 public boolean canHaveDisplayList() { 10353 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 10354 } 10355 10356 /** 10357 * @return The HardwareRenderer associated with that view or null if hardware rendering 10358 * is not supported or this this has not been attached to a window. 10359 * 10360 * @hide 10361 */ 10362 public HardwareRenderer getHardwareRenderer() { 10363 if (mAttachInfo != null) { 10364 return mAttachInfo.mHardwareRenderer; 10365 } 10366 return null; 10367 } 10368 10369 /** 10370 * <p>Returns a display list that can be used to draw this view again 10371 * without executing its draw method.</p> 10372 * 10373 * @return A DisplayList ready to replay, or null if caching is not enabled. 10374 * 10375 * @hide 10376 */ 10377 public DisplayList getDisplayList() { 10378 if (!canHaveDisplayList()) { 10379 return null; 10380 } 10381 10382 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 10383 mDisplayList == null || !mDisplayList.isValid() || 10384 mRecreateDisplayList)) { 10385 // Don't need to recreate the display list, just need to tell our 10386 // children to restore/recreate theirs 10387 if (mDisplayList != null && mDisplayList.isValid() && 10388 !mRecreateDisplayList) { 10389 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10390 mPrivateFlags &= ~DIRTY_MASK; 10391 dispatchGetDisplayList(); 10392 10393 return mDisplayList; 10394 } 10395 10396 // If we got here, we're recreating it. Mark it as such to ensure that 10397 // we copy in child display lists into ours in drawChild() 10398 mRecreateDisplayList = true; 10399 if (mDisplayList == null) { 10400 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 10401 // If we're creating a new display list, make sure our parent gets invalidated 10402 // since they will need to recreate their display list to account for this 10403 // new child display list. 10404 invalidateParentCaches(); 10405 } 10406 10407 final HardwareCanvas canvas = mDisplayList.start(); 10408 int restoreCount = 0; 10409 try { 10410 int width = mRight - mLeft; 10411 int height = mBottom - mTop; 10412 10413 canvas.setViewport(width, height); 10414 // The dirty rect should always be null for a display list 10415 canvas.onPreDraw(null); 10416 10417 computeScroll(); 10418 10419 restoreCount = canvas.save(); 10420 canvas.translate(-mScrollX, -mScrollY); 10421 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10422 mPrivateFlags &= ~DIRTY_MASK; 10423 10424 // Fast path for layouts with no backgrounds 10425 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10426 dispatchDraw(canvas); 10427 } else { 10428 draw(canvas); 10429 } 10430 } finally { 10431 canvas.restoreToCount(restoreCount); 10432 canvas.onPostDraw(); 10433 10434 mDisplayList.end(); 10435 } 10436 } else { 10437 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10438 mPrivateFlags &= ~DIRTY_MASK; 10439 } 10440 10441 return mDisplayList; 10442 } 10443 10444 /** 10445 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 10446 * 10447 * @return A non-scaled bitmap representing this view or null if cache is disabled. 10448 * 10449 * @see #getDrawingCache(boolean) 10450 */ 10451 public Bitmap getDrawingCache() { 10452 return getDrawingCache(false); 10453 } 10454 10455 /** 10456 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 10457 * is null when caching is disabled. If caching is enabled and the cache is not ready, 10458 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 10459 * draw from the cache when the cache is enabled. To benefit from the cache, you must 10460 * request the drawing cache by calling this method and draw it on screen if the 10461 * returned bitmap is not null.</p> 10462 * 10463 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10464 * this method will create a bitmap of the same size as this view. Because this bitmap 10465 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10466 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10467 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10468 * size than the view. This implies that your application must be able to handle this 10469 * size.</p> 10470 * 10471 * @param autoScale Indicates whether the generated bitmap should be scaled based on 10472 * the current density of the screen when the application is in compatibility 10473 * mode. 10474 * 10475 * @return A bitmap representing this view or null if cache is disabled. 10476 * 10477 * @see #setDrawingCacheEnabled(boolean) 10478 * @see #isDrawingCacheEnabled() 10479 * @see #buildDrawingCache(boolean) 10480 * @see #destroyDrawingCache() 10481 */ 10482 public Bitmap getDrawingCache(boolean autoScale) { 10483 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 10484 return null; 10485 } 10486 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 10487 buildDrawingCache(autoScale); 10488 } 10489 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 10490 } 10491 10492 /** 10493 * <p>Frees the resources used by the drawing cache. If you call 10494 * {@link #buildDrawingCache()} manually without calling 10495 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10496 * should cleanup the cache with this method afterwards.</p> 10497 * 10498 * @see #setDrawingCacheEnabled(boolean) 10499 * @see #buildDrawingCache() 10500 * @see #getDrawingCache() 10501 */ 10502 public void destroyDrawingCache() { 10503 if (mDrawingCache != null) { 10504 mDrawingCache.recycle(); 10505 mDrawingCache = null; 10506 } 10507 if (mUnscaledDrawingCache != null) { 10508 mUnscaledDrawingCache.recycle(); 10509 mUnscaledDrawingCache = null; 10510 } 10511 } 10512 10513 /** 10514 * Setting a solid background color for the drawing cache's bitmaps will improve 10515 * performance and memory usage. Note, though that this should only be used if this 10516 * view will always be drawn on top of a solid color. 10517 * 10518 * @param color The background color to use for the drawing cache's bitmap 10519 * 10520 * @see #setDrawingCacheEnabled(boolean) 10521 * @see #buildDrawingCache() 10522 * @see #getDrawingCache() 10523 */ 10524 public void setDrawingCacheBackgroundColor(int color) { 10525 if (color != mDrawingCacheBackgroundColor) { 10526 mDrawingCacheBackgroundColor = color; 10527 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10528 } 10529 } 10530 10531 /** 10532 * @see #setDrawingCacheBackgroundColor(int) 10533 * 10534 * @return The background color to used for the drawing cache's bitmap 10535 */ 10536 public int getDrawingCacheBackgroundColor() { 10537 return mDrawingCacheBackgroundColor; 10538 } 10539 10540 /** 10541 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 10542 * 10543 * @see #buildDrawingCache(boolean) 10544 */ 10545 public void buildDrawingCache() { 10546 buildDrawingCache(false); 10547 } 10548 10549 /** 10550 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 10551 * 10552 * <p>If you call {@link #buildDrawingCache()} manually without calling 10553 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10554 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 10555 * 10556 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10557 * this method will create a bitmap of the same size as this view. Because this bitmap 10558 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10559 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10560 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10561 * size than the view. This implies that your application must be able to handle this 10562 * size.</p> 10563 * 10564 * <p>You should avoid calling this method when hardware acceleration is enabled. If 10565 * you do not need the drawing cache bitmap, calling this method will increase memory 10566 * usage and cause the view to be rendered in software once, thus negatively impacting 10567 * performance.</p> 10568 * 10569 * @see #getDrawingCache() 10570 * @see #destroyDrawingCache() 10571 */ 10572 public void buildDrawingCache(boolean autoScale) { 10573 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 10574 mDrawingCache == null : mUnscaledDrawingCache == null)) { 10575 mCachingFailed = false; 10576 10577 if (ViewDebug.TRACE_HIERARCHY) { 10578 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 10579 } 10580 10581 int width = mRight - mLeft; 10582 int height = mBottom - mTop; 10583 10584 final AttachInfo attachInfo = mAttachInfo; 10585 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 10586 10587 if (autoScale && scalingRequired) { 10588 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 10589 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 10590 } 10591 10592 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 10593 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 10594 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 10595 10596 if (width <= 0 || height <= 0 || 10597 // Projected bitmap size in bytes 10598 (width * height * (opaque && !use32BitCache ? 2 : 4) > 10599 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 10600 destroyDrawingCache(); 10601 mCachingFailed = true; 10602 return; 10603 } 10604 10605 boolean clear = true; 10606 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 10607 10608 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 10609 Bitmap.Config quality; 10610 if (!opaque) { 10611 // Never pick ARGB_4444 because it looks awful 10612 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 10613 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 10614 case DRAWING_CACHE_QUALITY_AUTO: 10615 quality = Bitmap.Config.ARGB_8888; 10616 break; 10617 case DRAWING_CACHE_QUALITY_LOW: 10618 quality = Bitmap.Config.ARGB_8888; 10619 break; 10620 case DRAWING_CACHE_QUALITY_HIGH: 10621 quality = Bitmap.Config.ARGB_8888; 10622 break; 10623 default: 10624 quality = Bitmap.Config.ARGB_8888; 10625 break; 10626 } 10627 } else { 10628 // Optimization for translucent windows 10629 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 10630 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 10631 } 10632 10633 // Try to cleanup memory 10634 if (bitmap != null) bitmap.recycle(); 10635 10636 try { 10637 bitmap = Bitmap.createBitmap(width, height, quality); 10638 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10639 if (autoScale) { 10640 mDrawingCache = bitmap; 10641 } else { 10642 mUnscaledDrawingCache = bitmap; 10643 } 10644 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 10645 } catch (OutOfMemoryError e) { 10646 // If there is not enough memory to create the bitmap cache, just 10647 // ignore the issue as bitmap caches are not required to draw the 10648 // view hierarchy 10649 if (autoScale) { 10650 mDrawingCache = null; 10651 } else { 10652 mUnscaledDrawingCache = null; 10653 } 10654 mCachingFailed = true; 10655 return; 10656 } 10657 10658 clear = drawingCacheBackgroundColor != 0; 10659 } 10660 10661 Canvas canvas; 10662 if (attachInfo != null) { 10663 canvas = attachInfo.mCanvas; 10664 if (canvas == null) { 10665 canvas = new Canvas(); 10666 } 10667 canvas.setBitmap(bitmap); 10668 // Temporarily clobber the cached Canvas in case one of our children 10669 // is also using a drawing cache. Without this, the children would 10670 // steal the canvas by attaching their own bitmap to it and bad, bad 10671 // thing would happen (invisible views, corrupted drawings, etc.) 10672 attachInfo.mCanvas = null; 10673 } else { 10674 // This case should hopefully never or seldom happen 10675 canvas = new Canvas(bitmap); 10676 } 10677 10678 if (clear) { 10679 bitmap.eraseColor(drawingCacheBackgroundColor); 10680 } 10681 10682 computeScroll(); 10683 final int restoreCount = canvas.save(); 10684 10685 if (autoScale && scalingRequired) { 10686 final float scale = attachInfo.mApplicationScale; 10687 canvas.scale(scale, scale); 10688 } 10689 10690 canvas.translate(-mScrollX, -mScrollY); 10691 10692 mPrivateFlags |= DRAWN; 10693 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 10694 mLayerType != LAYER_TYPE_NONE) { 10695 mPrivateFlags |= DRAWING_CACHE_VALID; 10696 } 10697 10698 // Fast path for layouts with no backgrounds 10699 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10700 if (ViewDebug.TRACE_HIERARCHY) { 10701 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10702 } 10703 mPrivateFlags &= ~DIRTY_MASK; 10704 dispatchDraw(canvas); 10705 } else { 10706 draw(canvas); 10707 } 10708 10709 canvas.restoreToCount(restoreCount); 10710 canvas.setBitmap(null); 10711 10712 if (attachInfo != null) { 10713 // Restore the cached Canvas for our siblings 10714 attachInfo.mCanvas = canvas; 10715 } 10716 } 10717 } 10718 10719 /** 10720 * Create a snapshot of the view into a bitmap. We should probably make 10721 * some form of this public, but should think about the API. 10722 */ 10723 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 10724 int width = mRight - mLeft; 10725 int height = mBottom - mTop; 10726 10727 final AttachInfo attachInfo = mAttachInfo; 10728 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 10729 width = (int) ((width * scale) + 0.5f); 10730 height = (int) ((height * scale) + 0.5f); 10731 10732 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 10733 if (bitmap == null) { 10734 throw new OutOfMemoryError(); 10735 } 10736 10737 Resources resources = getResources(); 10738 if (resources != null) { 10739 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 10740 } 10741 10742 Canvas canvas; 10743 if (attachInfo != null) { 10744 canvas = attachInfo.mCanvas; 10745 if (canvas == null) { 10746 canvas = new Canvas(); 10747 } 10748 canvas.setBitmap(bitmap); 10749 // Temporarily clobber the cached Canvas in case one of our children 10750 // is also using a drawing cache. Without this, the children would 10751 // steal the canvas by attaching their own bitmap to it and bad, bad 10752 // things would happen (invisible views, corrupted drawings, etc.) 10753 attachInfo.mCanvas = null; 10754 } else { 10755 // This case should hopefully never or seldom happen 10756 canvas = new Canvas(bitmap); 10757 } 10758 10759 if ((backgroundColor & 0xff000000) != 0) { 10760 bitmap.eraseColor(backgroundColor); 10761 } 10762 10763 computeScroll(); 10764 final int restoreCount = canvas.save(); 10765 canvas.scale(scale, scale); 10766 canvas.translate(-mScrollX, -mScrollY); 10767 10768 // Temporarily remove the dirty mask 10769 int flags = mPrivateFlags; 10770 mPrivateFlags &= ~DIRTY_MASK; 10771 10772 // Fast path for layouts with no backgrounds 10773 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10774 dispatchDraw(canvas); 10775 } else { 10776 draw(canvas); 10777 } 10778 10779 mPrivateFlags = flags; 10780 10781 canvas.restoreToCount(restoreCount); 10782 canvas.setBitmap(null); 10783 10784 if (attachInfo != null) { 10785 // Restore the cached Canvas for our siblings 10786 attachInfo.mCanvas = canvas; 10787 } 10788 10789 return bitmap; 10790 } 10791 10792 /** 10793 * Indicates whether this View is currently in edit mode. A View is usually 10794 * in edit mode when displayed within a developer tool. For instance, if 10795 * this View is being drawn by a visual user interface builder, this method 10796 * should return true. 10797 * 10798 * Subclasses should check the return value of this method to provide 10799 * different behaviors if their normal behavior might interfere with the 10800 * host environment. For instance: the class spawns a thread in its 10801 * constructor, the drawing code relies on device-specific features, etc. 10802 * 10803 * This method is usually checked in the drawing code of custom widgets. 10804 * 10805 * @return True if this View is in edit mode, false otherwise. 10806 */ 10807 public boolean isInEditMode() { 10808 return false; 10809 } 10810 10811 /** 10812 * If the View draws content inside its padding and enables fading edges, 10813 * it needs to support padding offsets. Padding offsets are added to the 10814 * fading edges to extend the length of the fade so that it covers pixels 10815 * drawn inside the padding. 10816 * 10817 * Subclasses of this class should override this method if they need 10818 * to draw content inside the padding. 10819 * 10820 * @return True if padding offset must be applied, false otherwise. 10821 * 10822 * @see #getLeftPaddingOffset() 10823 * @see #getRightPaddingOffset() 10824 * @see #getTopPaddingOffset() 10825 * @see #getBottomPaddingOffset() 10826 * 10827 * @since CURRENT 10828 */ 10829 protected boolean isPaddingOffsetRequired() { 10830 return false; 10831 } 10832 10833 /** 10834 * Amount by which to extend the left fading region. Called only when 10835 * {@link #isPaddingOffsetRequired()} returns true. 10836 * 10837 * @return The left padding offset in pixels. 10838 * 10839 * @see #isPaddingOffsetRequired() 10840 * 10841 * @since CURRENT 10842 */ 10843 protected int getLeftPaddingOffset() { 10844 return 0; 10845 } 10846 10847 /** 10848 * Amount by which to extend the right fading region. Called only when 10849 * {@link #isPaddingOffsetRequired()} returns true. 10850 * 10851 * @return The right padding offset in pixels. 10852 * 10853 * @see #isPaddingOffsetRequired() 10854 * 10855 * @since CURRENT 10856 */ 10857 protected int getRightPaddingOffset() { 10858 return 0; 10859 } 10860 10861 /** 10862 * Amount by which to extend the top fading region. Called only when 10863 * {@link #isPaddingOffsetRequired()} returns true. 10864 * 10865 * @return The top padding offset in pixels. 10866 * 10867 * @see #isPaddingOffsetRequired() 10868 * 10869 * @since CURRENT 10870 */ 10871 protected int getTopPaddingOffset() { 10872 return 0; 10873 } 10874 10875 /** 10876 * Amount by which to extend the bottom fading region. Called only when 10877 * {@link #isPaddingOffsetRequired()} returns true. 10878 * 10879 * @return The bottom padding offset in pixels. 10880 * 10881 * @see #isPaddingOffsetRequired() 10882 * 10883 * @since CURRENT 10884 */ 10885 protected int getBottomPaddingOffset() { 10886 return 0; 10887 } 10888 10889 /** 10890 * @hide 10891 * @param offsetRequired 10892 */ 10893 protected int getFadeTop(boolean offsetRequired) { 10894 int top = mPaddingTop; 10895 if (offsetRequired) top += getTopPaddingOffset(); 10896 return top; 10897 } 10898 10899 /** 10900 * @hide 10901 * @param offsetRequired 10902 */ 10903 protected int getFadeHeight(boolean offsetRequired) { 10904 int padding = mPaddingTop; 10905 if (offsetRequired) padding += getTopPaddingOffset(); 10906 return mBottom - mTop - mPaddingBottom - padding; 10907 } 10908 10909 /** 10910 * <p>Indicates whether this view is attached to an hardware accelerated 10911 * window or not.</p> 10912 * 10913 * <p>Even if this method returns true, it does not mean that every call 10914 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 10915 * accelerated {@link android.graphics.Canvas}. For instance, if this view 10916 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 10917 * window is hardware accelerated, 10918 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 10919 * return false, and this method will return true.</p> 10920 * 10921 * @return True if the view is attached to a window and the window is 10922 * hardware accelerated; false in any other case. 10923 */ 10924 public boolean isHardwareAccelerated() { 10925 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 10926 } 10927 10928 /** 10929 * Manually render this view (and all of its children) to the given Canvas. 10930 * The view must have already done a full layout before this function is 10931 * called. When implementing a view, implement 10932 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 10933 * If you do need to override this method, call the superclass version. 10934 * 10935 * @param canvas The Canvas to which the View is rendered. 10936 */ 10937 public void draw(Canvas canvas) { 10938 if (ViewDebug.TRACE_HIERARCHY) { 10939 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10940 } 10941 10942 final int privateFlags = mPrivateFlags; 10943 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 10944 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 10945 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 10946 10947 /* 10948 * Draw traversal performs several drawing steps which must be executed 10949 * in the appropriate order: 10950 * 10951 * 1. Draw the background 10952 * 2. If necessary, save the canvas' layers to prepare for fading 10953 * 3. Draw view's content 10954 * 4. Draw children 10955 * 5. If necessary, draw the fading edges and restore layers 10956 * 6. Draw decorations (scrollbars for instance) 10957 */ 10958 10959 // Step 1, draw the background, if needed 10960 int saveCount; 10961 10962 if (!dirtyOpaque) { 10963 final Drawable background = mBGDrawable; 10964 if (background != null) { 10965 final int scrollX = mScrollX; 10966 final int scrollY = mScrollY; 10967 10968 if (mBackgroundSizeChanged) { 10969 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 10970 mBackgroundSizeChanged = false; 10971 } 10972 10973 if ((scrollX | scrollY) == 0) { 10974 background.draw(canvas); 10975 } else { 10976 canvas.translate(scrollX, scrollY); 10977 background.draw(canvas); 10978 canvas.translate(-scrollX, -scrollY); 10979 } 10980 } 10981 } 10982 10983 // skip step 2 & 5 if possible (common case) 10984 final int viewFlags = mViewFlags; 10985 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 10986 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 10987 if (!verticalEdges && !horizontalEdges) { 10988 // Step 3, draw the content 10989 if (!dirtyOpaque) onDraw(canvas); 10990 10991 // Step 4, draw the children 10992 dispatchDraw(canvas); 10993 10994 // Step 6, draw decorations (scrollbars) 10995 onDrawScrollBars(canvas); 10996 10997 // we're done... 10998 return; 10999 } 11000 11001 /* 11002 * Here we do the full fledged routine... 11003 * (this is an uncommon case where speed matters less, 11004 * this is why we repeat some of the tests that have been 11005 * done above) 11006 */ 11007 11008 boolean drawTop = false; 11009 boolean drawBottom = false; 11010 boolean drawLeft = false; 11011 boolean drawRight = false; 11012 11013 float topFadeStrength = 0.0f; 11014 float bottomFadeStrength = 0.0f; 11015 float leftFadeStrength = 0.0f; 11016 float rightFadeStrength = 0.0f; 11017 11018 // Step 2, save the canvas' layers 11019 int paddingLeft = mPaddingLeft; 11020 11021 final boolean offsetRequired = isPaddingOffsetRequired(); 11022 if (offsetRequired) { 11023 paddingLeft += getLeftPaddingOffset(); 11024 } 11025 11026 int left = mScrollX + paddingLeft; 11027 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 11028 int top = mScrollY + getFadeTop(offsetRequired); 11029 int bottom = top + getFadeHeight(offsetRequired); 11030 11031 if (offsetRequired) { 11032 right += getRightPaddingOffset(); 11033 bottom += getBottomPaddingOffset(); 11034 } 11035 11036 final ScrollabilityCache scrollabilityCache = mScrollCache; 11037 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 11038 int length = (int) fadeHeight; 11039 11040 // clip the fade length if top and bottom fades overlap 11041 // overlapping fades produce odd-looking artifacts 11042 if (verticalEdges && (top + length > bottom - length)) { 11043 length = (bottom - top) / 2; 11044 } 11045 11046 // also clip horizontal fades if necessary 11047 if (horizontalEdges && (left + length > right - length)) { 11048 length = (right - left) / 2; 11049 } 11050 11051 if (verticalEdges) { 11052 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 11053 drawTop = topFadeStrength * fadeHeight > 1.0f; 11054 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 11055 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 11056 } 11057 11058 if (horizontalEdges) { 11059 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 11060 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 11061 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 11062 drawRight = rightFadeStrength * fadeHeight > 1.0f; 11063 } 11064 11065 saveCount = canvas.getSaveCount(); 11066 11067 int solidColor = getSolidColor(); 11068 if (solidColor == 0) { 11069 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 11070 11071 if (drawTop) { 11072 canvas.saveLayer(left, top, right, top + length, null, flags); 11073 } 11074 11075 if (drawBottom) { 11076 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 11077 } 11078 11079 if (drawLeft) { 11080 canvas.saveLayer(left, top, left + length, bottom, null, flags); 11081 } 11082 11083 if (drawRight) { 11084 canvas.saveLayer(right - length, top, right, bottom, null, flags); 11085 } 11086 } else { 11087 scrollabilityCache.setFadeColor(solidColor); 11088 } 11089 11090 // Step 3, draw the content 11091 if (!dirtyOpaque) onDraw(canvas); 11092 11093 // Step 4, draw the children 11094 dispatchDraw(canvas); 11095 11096 // Step 5, draw the fade effect and restore layers 11097 final Paint p = scrollabilityCache.paint; 11098 final Matrix matrix = scrollabilityCache.matrix; 11099 final Shader fade = scrollabilityCache.shader; 11100 11101 if (drawTop) { 11102 matrix.setScale(1, fadeHeight * topFadeStrength); 11103 matrix.postTranslate(left, top); 11104 fade.setLocalMatrix(matrix); 11105 canvas.drawRect(left, top, right, top + length, p); 11106 } 11107 11108 if (drawBottom) { 11109 matrix.setScale(1, fadeHeight * bottomFadeStrength); 11110 matrix.postRotate(180); 11111 matrix.postTranslate(left, bottom); 11112 fade.setLocalMatrix(matrix); 11113 canvas.drawRect(left, bottom - length, right, bottom, p); 11114 } 11115 11116 if (drawLeft) { 11117 matrix.setScale(1, fadeHeight * leftFadeStrength); 11118 matrix.postRotate(-90); 11119 matrix.postTranslate(left, top); 11120 fade.setLocalMatrix(matrix); 11121 canvas.drawRect(left, top, left + length, bottom, p); 11122 } 11123 11124 if (drawRight) { 11125 matrix.setScale(1, fadeHeight * rightFadeStrength); 11126 matrix.postRotate(90); 11127 matrix.postTranslate(right, top); 11128 fade.setLocalMatrix(matrix); 11129 canvas.drawRect(right - length, top, right, bottom, p); 11130 } 11131 11132 canvas.restoreToCount(saveCount); 11133 11134 // Step 6, draw decorations (scrollbars) 11135 onDrawScrollBars(canvas); 11136 } 11137 11138 /** 11139 * Override this if your view is known to always be drawn on top of a solid color background, 11140 * and needs to draw fading edges. Returning a non-zero color enables the view system to 11141 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 11142 * should be set to 0xFF. 11143 * 11144 * @see #setVerticalFadingEdgeEnabled(boolean) 11145 * @see #setHorizontalFadingEdgeEnabled(boolean) 11146 * 11147 * @return The known solid color background for this view, or 0 if the color may vary 11148 */ 11149 @ViewDebug.ExportedProperty(category = "drawing") 11150 public int getSolidColor() { 11151 return 0; 11152 } 11153 11154 /** 11155 * Build a human readable string representation of the specified view flags. 11156 * 11157 * @param flags the view flags to convert to a string 11158 * @return a String representing the supplied flags 11159 */ 11160 private static String printFlags(int flags) { 11161 String output = ""; 11162 int numFlags = 0; 11163 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 11164 output += "TAKES_FOCUS"; 11165 numFlags++; 11166 } 11167 11168 switch (flags & VISIBILITY_MASK) { 11169 case INVISIBLE: 11170 if (numFlags > 0) { 11171 output += " "; 11172 } 11173 output += "INVISIBLE"; 11174 // USELESS HERE numFlags++; 11175 break; 11176 case GONE: 11177 if (numFlags > 0) { 11178 output += " "; 11179 } 11180 output += "GONE"; 11181 // USELESS HERE numFlags++; 11182 break; 11183 default: 11184 break; 11185 } 11186 return output; 11187 } 11188 11189 /** 11190 * Build a human readable string representation of the specified private 11191 * view flags. 11192 * 11193 * @param privateFlags the private view flags to convert to a string 11194 * @return a String representing the supplied flags 11195 */ 11196 private static String printPrivateFlags(int privateFlags) { 11197 String output = ""; 11198 int numFlags = 0; 11199 11200 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 11201 output += "WANTS_FOCUS"; 11202 numFlags++; 11203 } 11204 11205 if ((privateFlags & FOCUSED) == FOCUSED) { 11206 if (numFlags > 0) { 11207 output += " "; 11208 } 11209 output += "FOCUSED"; 11210 numFlags++; 11211 } 11212 11213 if ((privateFlags & SELECTED) == SELECTED) { 11214 if (numFlags > 0) { 11215 output += " "; 11216 } 11217 output += "SELECTED"; 11218 numFlags++; 11219 } 11220 11221 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 11222 if (numFlags > 0) { 11223 output += " "; 11224 } 11225 output += "IS_ROOT_NAMESPACE"; 11226 numFlags++; 11227 } 11228 11229 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 11230 if (numFlags > 0) { 11231 output += " "; 11232 } 11233 output += "HAS_BOUNDS"; 11234 numFlags++; 11235 } 11236 11237 if ((privateFlags & DRAWN) == DRAWN) { 11238 if (numFlags > 0) { 11239 output += " "; 11240 } 11241 output += "DRAWN"; 11242 // USELESS HERE numFlags++; 11243 } 11244 return output; 11245 } 11246 11247 /** 11248 * <p>Indicates whether or not this view's layout will be requested during 11249 * the next hierarchy layout pass.</p> 11250 * 11251 * @return true if the layout will be forced during next layout pass 11252 */ 11253 public boolean isLayoutRequested() { 11254 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 11255 } 11256 11257 /** 11258 * Assign a size and position to a view and all of its 11259 * descendants 11260 * 11261 * <p>This is the second phase of the layout mechanism. 11262 * (The first is measuring). In this phase, each parent calls 11263 * layout on all of its children to position them. 11264 * This is typically done using the child measurements 11265 * that were stored in the measure pass().</p> 11266 * 11267 * <p>Derived classes should not override this method. 11268 * Derived classes with children should override 11269 * onLayout. In that method, they should 11270 * call layout on each of their children.</p> 11271 * 11272 * @param l Left position, relative to parent 11273 * @param t Top position, relative to parent 11274 * @param r Right position, relative to parent 11275 * @param b Bottom position, relative to parent 11276 */ 11277 @SuppressWarnings({"unchecked"}) 11278 public void layout(int l, int t, int r, int b) { 11279 int oldL = mLeft; 11280 int oldT = mTop; 11281 int oldB = mBottom; 11282 int oldR = mRight; 11283 boolean changed = setFrame(l, t, r, b); 11284 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 11285 if (ViewDebug.TRACE_HIERARCHY) { 11286 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 11287 } 11288 11289 onLayout(changed, l, t, r, b); 11290 mPrivateFlags &= ~LAYOUT_REQUIRED; 11291 11292 ListenerInfo li = mListenerInfo; 11293 if (li != null && li.mOnLayoutChangeListeners != null) { 11294 ArrayList<OnLayoutChangeListener> listenersCopy = 11295 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 11296 int numListeners = listenersCopy.size(); 11297 for (int i = 0; i < numListeners; ++i) { 11298 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 11299 } 11300 } 11301 } 11302 mPrivateFlags &= ~FORCE_LAYOUT; 11303 } 11304 11305 /** 11306 * Called from layout when this view should 11307 * assign a size and position to each of its children. 11308 * 11309 * Derived classes with children should override 11310 * this method and call layout on each of 11311 * their children. 11312 * @param changed This is a new size or position for this view 11313 * @param left Left position, relative to parent 11314 * @param top Top position, relative to parent 11315 * @param right Right position, relative to parent 11316 * @param bottom Bottom position, relative to parent 11317 */ 11318 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 11319 } 11320 11321 /** 11322 * Assign a size and position to this view. 11323 * 11324 * This is called from layout. 11325 * 11326 * @param left Left position, relative to parent 11327 * @param top Top position, relative to parent 11328 * @param right Right position, relative to parent 11329 * @param bottom Bottom position, relative to parent 11330 * @return true if the new size and position are different than the 11331 * previous ones 11332 * {@hide} 11333 */ 11334 protected boolean setFrame(int left, int top, int right, int bottom) { 11335 boolean changed = false; 11336 11337 if (DBG) { 11338 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 11339 + right + "," + bottom + ")"); 11340 } 11341 11342 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 11343 changed = true; 11344 11345 // Remember our drawn bit 11346 int drawn = mPrivateFlags & DRAWN; 11347 11348 int oldWidth = mRight - mLeft; 11349 int oldHeight = mBottom - mTop; 11350 int newWidth = right - left; 11351 int newHeight = bottom - top; 11352 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 11353 11354 // Invalidate our old position 11355 invalidate(sizeChanged); 11356 11357 mLeft = left; 11358 mTop = top; 11359 mRight = right; 11360 mBottom = bottom; 11361 11362 mPrivateFlags |= HAS_BOUNDS; 11363 11364 11365 if (sizeChanged) { 11366 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 11367 // A change in dimension means an auto-centered pivot point changes, too 11368 if (mTransformationInfo != null) { 11369 mTransformationInfo.mMatrixDirty = true; 11370 } 11371 } 11372 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 11373 } 11374 11375 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 11376 // If we are visible, force the DRAWN bit to on so that 11377 // this invalidate will go through (at least to our parent). 11378 // This is because someone may have invalidated this view 11379 // before this call to setFrame came in, thereby clearing 11380 // the DRAWN bit. 11381 mPrivateFlags |= DRAWN; 11382 invalidate(sizeChanged); 11383 // parent display list may need to be recreated based on a change in the bounds 11384 // of any child 11385 invalidateParentCaches(); 11386 } 11387 11388 // Reset drawn bit to original value (invalidate turns it off) 11389 mPrivateFlags |= drawn; 11390 11391 mBackgroundSizeChanged = true; 11392 } 11393 return changed; 11394 } 11395 11396 /** 11397 * Finalize inflating a view from XML. This is called as the last phase 11398 * of inflation, after all child views have been added. 11399 * 11400 * <p>Even if the subclass overrides onFinishInflate, they should always be 11401 * sure to call the super method, so that we get called. 11402 */ 11403 protected void onFinishInflate() { 11404 } 11405 11406 /** 11407 * Returns the resources associated with this view. 11408 * 11409 * @return Resources object. 11410 */ 11411 public Resources getResources() { 11412 return mResources; 11413 } 11414 11415 /** 11416 * Invalidates the specified Drawable. 11417 * 11418 * @param drawable the drawable to invalidate 11419 */ 11420 public void invalidateDrawable(Drawable drawable) { 11421 if (verifyDrawable(drawable)) { 11422 final Rect dirty = drawable.getBounds(); 11423 final int scrollX = mScrollX; 11424 final int scrollY = mScrollY; 11425 11426 invalidate(dirty.left + scrollX, dirty.top + scrollY, 11427 dirty.right + scrollX, dirty.bottom + scrollY); 11428 } 11429 } 11430 11431 /** 11432 * Schedules an action on a drawable to occur at a specified time. 11433 * 11434 * @param who the recipient of the action 11435 * @param what the action to run on the drawable 11436 * @param when the time at which the action must occur. Uses the 11437 * {@link SystemClock#uptimeMillis} timebase. 11438 */ 11439 public void scheduleDrawable(Drawable who, Runnable what, long when) { 11440 if (verifyDrawable(who) && what != null) { 11441 if (mAttachInfo != null) { 11442 mAttachInfo.mHandler.postAtTime(what, who, when); 11443 } else { 11444 ViewRootImpl.getRunQueue().postDelayed(what, when - SystemClock.uptimeMillis()); 11445 } 11446 } 11447 } 11448 11449 /** 11450 * Cancels a scheduled action on a drawable. 11451 * 11452 * @param who the recipient of the action 11453 * @param what the action to cancel 11454 */ 11455 public void unscheduleDrawable(Drawable who, Runnable what) { 11456 if (verifyDrawable(who) && what != null) { 11457 if (mAttachInfo != null) { 11458 mAttachInfo.mHandler.removeCallbacks(what, who); 11459 } else { 11460 ViewRootImpl.getRunQueue().removeCallbacks(what); 11461 } 11462 } 11463 } 11464 11465 /** 11466 * Unschedule any events associated with the given Drawable. This can be 11467 * used when selecting a new Drawable into a view, so that the previous 11468 * one is completely unscheduled. 11469 * 11470 * @param who The Drawable to unschedule. 11471 * 11472 * @see #drawableStateChanged 11473 */ 11474 public void unscheduleDrawable(Drawable who) { 11475 if (mAttachInfo != null) { 11476 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 11477 } 11478 } 11479 11480 /** 11481 * Return the layout direction of a given Drawable. 11482 * 11483 * @param who the Drawable to query 11484 * 11485 * @hide 11486 */ 11487 public int getResolvedLayoutDirection(Drawable who) { 11488 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 11489 } 11490 11491 /** 11492 * If your view subclass is displaying its own Drawable objects, it should 11493 * override this function and return true for any Drawable it is 11494 * displaying. This allows animations for those drawables to be 11495 * scheduled. 11496 * 11497 * <p>Be sure to call through to the super class when overriding this 11498 * function. 11499 * 11500 * @param who The Drawable to verify. Return true if it is one you are 11501 * displaying, else return the result of calling through to the 11502 * super class. 11503 * 11504 * @return boolean If true than the Drawable is being displayed in the 11505 * view; else false and it is not allowed to animate. 11506 * 11507 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 11508 * @see #drawableStateChanged() 11509 */ 11510 protected boolean verifyDrawable(Drawable who) { 11511 return who == mBGDrawable; 11512 } 11513 11514 /** 11515 * This function is called whenever the state of the view changes in such 11516 * a way that it impacts the state of drawables being shown. 11517 * 11518 * <p>Be sure to call through to the superclass when overriding this 11519 * function. 11520 * 11521 * @see Drawable#setState(int[]) 11522 */ 11523 protected void drawableStateChanged() { 11524 Drawable d = mBGDrawable; 11525 if (d != null && d.isStateful()) { 11526 d.setState(getDrawableState()); 11527 } 11528 } 11529 11530 /** 11531 * Call this to force a view to update its drawable state. This will cause 11532 * drawableStateChanged to be called on this view. Views that are interested 11533 * in the new state should call getDrawableState. 11534 * 11535 * @see #drawableStateChanged 11536 * @see #getDrawableState 11537 */ 11538 public void refreshDrawableState() { 11539 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11540 drawableStateChanged(); 11541 11542 ViewParent parent = mParent; 11543 if (parent != null) { 11544 parent.childDrawableStateChanged(this); 11545 } 11546 } 11547 11548 /** 11549 * Return an array of resource IDs of the drawable states representing the 11550 * current state of the view. 11551 * 11552 * @return The current drawable state 11553 * 11554 * @see Drawable#setState(int[]) 11555 * @see #drawableStateChanged() 11556 * @see #onCreateDrawableState(int) 11557 */ 11558 public final int[] getDrawableState() { 11559 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 11560 return mDrawableState; 11561 } else { 11562 mDrawableState = onCreateDrawableState(0); 11563 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 11564 return mDrawableState; 11565 } 11566 } 11567 11568 /** 11569 * Generate the new {@link android.graphics.drawable.Drawable} state for 11570 * this view. This is called by the view 11571 * system when the cached Drawable state is determined to be invalid. To 11572 * retrieve the current state, you should use {@link #getDrawableState}. 11573 * 11574 * @param extraSpace if non-zero, this is the number of extra entries you 11575 * would like in the returned array in which you can place your own 11576 * states. 11577 * 11578 * @return Returns an array holding the current {@link Drawable} state of 11579 * the view. 11580 * 11581 * @see #mergeDrawableStates(int[], int[]) 11582 */ 11583 protected int[] onCreateDrawableState(int extraSpace) { 11584 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 11585 mParent instanceof View) { 11586 return ((View) mParent).onCreateDrawableState(extraSpace); 11587 } 11588 11589 int[] drawableState; 11590 11591 int privateFlags = mPrivateFlags; 11592 11593 int viewStateIndex = 0; 11594 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 11595 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 11596 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 11597 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 11598 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 11599 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 11600 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 11601 HardwareRenderer.isAvailable()) { 11602 // This is set if HW acceleration is requested, even if the current 11603 // process doesn't allow it. This is just to allow app preview 11604 // windows to better match their app. 11605 viewStateIndex |= VIEW_STATE_ACCELERATED; 11606 } 11607 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 11608 11609 final int privateFlags2 = mPrivateFlags2; 11610 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 11611 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 11612 11613 drawableState = VIEW_STATE_SETS[viewStateIndex]; 11614 11615 //noinspection ConstantIfStatement 11616 if (false) { 11617 Log.i("View", "drawableStateIndex=" + viewStateIndex); 11618 Log.i("View", toString() 11619 + " pressed=" + ((privateFlags & PRESSED) != 0) 11620 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 11621 + " fo=" + hasFocus() 11622 + " sl=" + ((privateFlags & SELECTED) != 0) 11623 + " wf=" + hasWindowFocus() 11624 + ": " + Arrays.toString(drawableState)); 11625 } 11626 11627 if (extraSpace == 0) { 11628 return drawableState; 11629 } 11630 11631 final int[] fullState; 11632 if (drawableState != null) { 11633 fullState = new int[drawableState.length + extraSpace]; 11634 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 11635 } else { 11636 fullState = new int[extraSpace]; 11637 } 11638 11639 return fullState; 11640 } 11641 11642 /** 11643 * Merge your own state values in <var>additionalState</var> into the base 11644 * state values <var>baseState</var> that were returned by 11645 * {@link #onCreateDrawableState(int)}. 11646 * 11647 * @param baseState The base state values returned by 11648 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 11649 * own additional state values. 11650 * 11651 * @param additionalState The additional state values you would like 11652 * added to <var>baseState</var>; this array is not modified. 11653 * 11654 * @return As a convenience, the <var>baseState</var> array you originally 11655 * passed into the function is returned. 11656 * 11657 * @see #onCreateDrawableState(int) 11658 */ 11659 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 11660 final int N = baseState.length; 11661 int i = N - 1; 11662 while (i >= 0 && baseState[i] == 0) { 11663 i--; 11664 } 11665 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 11666 return baseState; 11667 } 11668 11669 /** 11670 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 11671 * on all Drawable objects associated with this view. 11672 */ 11673 public void jumpDrawablesToCurrentState() { 11674 if (mBGDrawable != null) { 11675 mBGDrawable.jumpToCurrentState(); 11676 } 11677 } 11678 11679 /** 11680 * Sets the background color for this view. 11681 * @param color the color of the background 11682 */ 11683 @RemotableViewMethod 11684 public void setBackgroundColor(int color) { 11685 if (mBGDrawable instanceof ColorDrawable) { 11686 ((ColorDrawable) mBGDrawable).setColor(color); 11687 } else { 11688 setBackgroundDrawable(new ColorDrawable(color)); 11689 } 11690 } 11691 11692 /** 11693 * Set the background to a given resource. The resource should refer to 11694 * a Drawable object or 0 to remove the background. 11695 * @param resid The identifier of the resource. 11696 * @attr ref android.R.styleable#View_background 11697 */ 11698 @RemotableViewMethod 11699 public void setBackgroundResource(int resid) { 11700 if (resid != 0 && resid == mBackgroundResource) { 11701 return; 11702 } 11703 11704 Drawable d= null; 11705 if (resid != 0) { 11706 d = mResources.getDrawable(resid); 11707 } 11708 setBackgroundDrawable(d); 11709 11710 mBackgroundResource = resid; 11711 } 11712 11713 /** 11714 * Set the background to a given Drawable, or remove the background. If the 11715 * background has padding, this View's padding is set to the background's 11716 * padding. However, when a background is removed, this View's padding isn't 11717 * touched. If setting the padding is desired, please use 11718 * {@link #setPadding(int, int, int, int)}. 11719 * 11720 * @param d The Drawable to use as the background, or null to remove the 11721 * background 11722 */ 11723 public void setBackgroundDrawable(Drawable d) { 11724 if (d == mBGDrawable) { 11725 return; 11726 } 11727 11728 boolean requestLayout = false; 11729 11730 mBackgroundResource = 0; 11731 11732 /* 11733 * Regardless of whether we're setting a new background or not, we want 11734 * to clear the previous drawable. 11735 */ 11736 if (mBGDrawable != null) { 11737 mBGDrawable.setCallback(null); 11738 unscheduleDrawable(mBGDrawable); 11739 } 11740 11741 if (d != null) { 11742 Rect padding = sThreadLocal.get(); 11743 if (padding == null) { 11744 padding = new Rect(); 11745 sThreadLocal.set(padding); 11746 } 11747 if (d.getPadding(padding)) { 11748 switch (d.getResolvedLayoutDirectionSelf()) { 11749 case LAYOUT_DIRECTION_RTL: 11750 setPadding(padding.right, padding.top, padding.left, padding.bottom); 11751 break; 11752 case LAYOUT_DIRECTION_LTR: 11753 default: 11754 setPadding(padding.left, padding.top, padding.right, padding.bottom); 11755 } 11756 } 11757 11758 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 11759 // if it has a different minimum size, we should layout again 11760 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 11761 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 11762 requestLayout = true; 11763 } 11764 11765 d.setCallback(this); 11766 if (d.isStateful()) { 11767 d.setState(getDrawableState()); 11768 } 11769 d.setVisible(getVisibility() == VISIBLE, false); 11770 mBGDrawable = d; 11771 11772 if ((mPrivateFlags & SKIP_DRAW) != 0) { 11773 mPrivateFlags &= ~SKIP_DRAW; 11774 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 11775 requestLayout = true; 11776 } 11777 } else { 11778 /* Remove the background */ 11779 mBGDrawable = null; 11780 11781 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 11782 /* 11783 * This view ONLY drew the background before and we're removing 11784 * the background, so now it won't draw anything 11785 * (hence we SKIP_DRAW) 11786 */ 11787 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 11788 mPrivateFlags |= SKIP_DRAW; 11789 } 11790 11791 /* 11792 * When the background is set, we try to apply its padding to this 11793 * View. When the background is removed, we don't touch this View's 11794 * padding. This is noted in the Javadocs. Hence, we don't need to 11795 * requestLayout(), the invalidate() below is sufficient. 11796 */ 11797 11798 // The old background's minimum size could have affected this 11799 // View's layout, so let's requestLayout 11800 requestLayout = true; 11801 } 11802 11803 computeOpaqueFlags(); 11804 11805 if (requestLayout) { 11806 requestLayout(); 11807 } 11808 11809 mBackgroundSizeChanged = true; 11810 invalidate(true); 11811 } 11812 11813 /** 11814 * Gets the background drawable 11815 * @return The drawable used as the background for this view, if any. 11816 */ 11817 public Drawable getBackground() { 11818 return mBGDrawable; 11819 } 11820 11821 /** 11822 * Sets the padding. The view may add on the space required to display 11823 * the scrollbars, depending on the style and visibility of the scrollbars. 11824 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 11825 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 11826 * from the values set in this call. 11827 * 11828 * @attr ref android.R.styleable#View_padding 11829 * @attr ref android.R.styleable#View_paddingBottom 11830 * @attr ref android.R.styleable#View_paddingLeft 11831 * @attr ref android.R.styleable#View_paddingRight 11832 * @attr ref android.R.styleable#View_paddingTop 11833 * @param left the left padding in pixels 11834 * @param top the top padding in pixels 11835 * @param right the right padding in pixels 11836 * @param bottom the bottom padding in pixels 11837 */ 11838 public void setPadding(int left, int top, int right, int bottom) { 11839 boolean changed = false; 11840 11841 mUserPaddingRelative = false; 11842 11843 mUserPaddingLeft = left; 11844 mUserPaddingRight = right; 11845 mUserPaddingBottom = bottom; 11846 11847 final int viewFlags = mViewFlags; 11848 11849 // Common case is there are no scroll bars. 11850 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 11851 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 11852 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 11853 ? 0 : getVerticalScrollbarWidth(); 11854 switch (mVerticalScrollbarPosition) { 11855 case SCROLLBAR_POSITION_DEFAULT: 11856 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11857 left += offset; 11858 } else { 11859 right += offset; 11860 } 11861 break; 11862 case SCROLLBAR_POSITION_RIGHT: 11863 right += offset; 11864 break; 11865 case SCROLLBAR_POSITION_LEFT: 11866 left += offset; 11867 break; 11868 } 11869 } 11870 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 11871 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 11872 ? 0 : getHorizontalScrollbarHeight(); 11873 } 11874 } 11875 11876 if (mPaddingLeft != left) { 11877 changed = true; 11878 mPaddingLeft = left; 11879 } 11880 if (mPaddingTop != top) { 11881 changed = true; 11882 mPaddingTop = top; 11883 } 11884 if (mPaddingRight != right) { 11885 changed = true; 11886 mPaddingRight = right; 11887 } 11888 if (mPaddingBottom != bottom) { 11889 changed = true; 11890 mPaddingBottom = bottom; 11891 } 11892 11893 if (changed) { 11894 requestLayout(); 11895 } 11896 } 11897 11898 /** 11899 * Sets the relative padding. The view may add on the space required to display 11900 * the scrollbars, depending on the style and visibility of the scrollbars. 11901 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 11902 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 11903 * from the values set in this call. 11904 * 11905 * @attr ref android.R.styleable#View_padding 11906 * @attr ref android.R.styleable#View_paddingBottom 11907 * @attr ref android.R.styleable#View_paddingStart 11908 * @attr ref android.R.styleable#View_paddingEnd 11909 * @attr ref android.R.styleable#View_paddingTop 11910 * @param start the start padding in pixels 11911 * @param top the top padding in pixels 11912 * @param end the end padding in pixels 11913 * @param bottom the bottom padding in pixels 11914 * 11915 * @hide 11916 */ 11917 public void setPaddingRelative(int start, int top, int end, int bottom) { 11918 mUserPaddingRelative = true; 11919 11920 mUserPaddingStart = start; 11921 mUserPaddingEnd = end; 11922 11923 switch(getResolvedLayoutDirection()) { 11924 case LAYOUT_DIRECTION_RTL: 11925 setPadding(end, top, start, bottom); 11926 break; 11927 case LAYOUT_DIRECTION_LTR: 11928 default: 11929 setPadding(start, top, end, bottom); 11930 } 11931 } 11932 11933 /** 11934 * Returns the top padding of this view. 11935 * 11936 * @return the top padding in pixels 11937 */ 11938 public int getPaddingTop() { 11939 return mPaddingTop; 11940 } 11941 11942 /** 11943 * Returns the bottom padding of this view. If there are inset and enabled 11944 * scrollbars, this value may include the space required to display the 11945 * scrollbars as well. 11946 * 11947 * @return the bottom padding in pixels 11948 */ 11949 public int getPaddingBottom() { 11950 return mPaddingBottom; 11951 } 11952 11953 /** 11954 * Returns the left padding of this view. If there are inset and enabled 11955 * scrollbars, this value may include the space required to display the 11956 * scrollbars as well. 11957 * 11958 * @return the left padding in pixels 11959 */ 11960 public int getPaddingLeft() { 11961 return mPaddingLeft; 11962 } 11963 11964 /** 11965 * Returns the start padding of this view. If there are inset and enabled 11966 * scrollbars, this value may include the space required to display the 11967 * scrollbars as well. 11968 * 11969 * @return the start padding in pixels 11970 * 11971 * @hide 11972 */ 11973 public int getPaddingStart() { 11974 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11975 mPaddingRight : mPaddingLeft; 11976 } 11977 11978 /** 11979 * Returns the right padding of this view. If there are inset and enabled 11980 * scrollbars, this value may include the space required to display the 11981 * scrollbars as well. 11982 * 11983 * @return the right padding in pixels 11984 */ 11985 public int getPaddingRight() { 11986 return mPaddingRight; 11987 } 11988 11989 /** 11990 * Returns the end padding of this view. If there are inset and enabled 11991 * scrollbars, this value may include the space required to display the 11992 * scrollbars as well. 11993 * 11994 * @return the end padding in pixels 11995 * 11996 * @hide 11997 */ 11998 public int getPaddingEnd() { 11999 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 12000 mPaddingLeft : mPaddingRight; 12001 } 12002 12003 /** 12004 * Return if the padding as been set thru relative values 12005 * {@link #setPaddingRelative(int, int, int, int)} or thru 12006 * @attr ref android.R.styleable#View_paddingStart or 12007 * @attr ref android.R.styleable#View_paddingEnd 12008 * 12009 * @return true if the padding is relative or false if it is not. 12010 * 12011 * @hide 12012 */ 12013 public boolean isPaddingRelative() { 12014 return mUserPaddingRelative; 12015 } 12016 12017 /** 12018 * Changes the selection state of this view. A view can be selected or not. 12019 * Note that selection is not the same as focus. Views are typically 12020 * selected in the context of an AdapterView like ListView or GridView; 12021 * the selected view is the view that is highlighted. 12022 * 12023 * @param selected true if the view must be selected, false otherwise 12024 */ 12025 public void setSelected(boolean selected) { 12026 if (((mPrivateFlags & SELECTED) != 0) != selected) { 12027 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 12028 if (!selected) resetPressedState(); 12029 invalidate(true); 12030 refreshDrawableState(); 12031 dispatchSetSelected(selected); 12032 } 12033 } 12034 12035 /** 12036 * Dispatch setSelected to all of this View's children. 12037 * 12038 * @see #setSelected(boolean) 12039 * 12040 * @param selected The new selected state 12041 */ 12042 protected void dispatchSetSelected(boolean selected) { 12043 } 12044 12045 /** 12046 * Indicates the selection state of this view. 12047 * 12048 * @return true if the view is selected, false otherwise 12049 */ 12050 @ViewDebug.ExportedProperty 12051 public boolean isSelected() { 12052 return (mPrivateFlags & SELECTED) != 0; 12053 } 12054 12055 /** 12056 * Changes the activated state of this view. A view can be activated or not. 12057 * Note that activation is not the same as selection. Selection is 12058 * a transient property, representing the view (hierarchy) the user is 12059 * currently interacting with. Activation is a longer-term state that the 12060 * user can move views in and out of. For example, in a list view with 12061 * single or multiple selection enabled, the views in the current selection 12062 * set are activated. (Um, yeah, we are deeply sorry about the terminology 12063 * here.) The activated state is propagated down to children of the view it 12064 * is set on. 12065 * 12066 * @param activated true if the view must be activated, false otherwise 12067 */ 12068 public void setActivated(boolean activated) { 12069 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 12070 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 12071 invalidate(true); 12072 refreshDrawableState(); 12073 dispatchSetActivated(activated); 12074 } 12075 } 12076 12077 /** 12078 * Dispatch setActivated to all of this View's children. 12079 * 12080 * @see #setActivated(boolean) 12081 * 12082 * @param activated The new activated state 12083 */ 12084 protected void dispatchSetActivated(boolean activated) { 12085 } 12086 12087 /** 12088 * Indicates the activation state of this view. 12089 * 12090 * @return true if the view is activated, false otherwise 12091 */ 12092 @ViewDebug.ExportedProperty 12093 public boolean isActivated() { 12094 return (mPrivateFlags & ACTIVATED) != 0; 12095 } 12096 12097 /** 12098 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 12099 * observer can be used to get notifications when global events, like 12100 * layout, happen. 12101 * 12102 * The returned ViewTreeObserver observer is not guaranteed to remain 12103 * valid for the lifetime of this View. If the caller of this method keeps 12104 * a long-lived reference to ViewTreeObserver, it should always check for 12105 * the return value of {@link ViewTreeObserver#isAlive()}. 12106 * 12107 * @return The ViewTreeObserver for this view's hierarchy. 12108 */ 12109 public ViewTreeObserver getViewTreeObserver() { 12110 if (mAttachInfo != null) { 12111 return mAttachInfo.mTreeObserver; 12112 } 12113 if (mFloatingTreeObserver == null) { 12114 mFloatingTreeObserver = new ViewTreeObserver(); 12115 } 12116 return mFloatingTreeObserver; 12117 } 12118 12119 /** 12120 * <p>Finds the topmost view in the current view hierarchy.</p> 12121 * 12122 * @return the topmost view containing this view 12123 */ 12124 public View getRootView() { 12125 if (mAttachInfo != null) { 12126 final View v = mAttachInfo.mRootView; 12127 if (v != null) { 12128 return v; 12129 } 12130 } 12131 12132 View parent = this; 12133 12134 while (parent.mParent != null && parent.mParent instanceof View) { 12135 parent = (View) parent.mParent; 12136 } 12137 12138 return parent; 12139 } 12140 12141 /** 12142 * <p>Computes the coordinates of this view on the screen. The argument 12143 * must be an array of two integers. After the method returns, the array 12144 * contains the x and y location in that order.</p> 12145 * 12146 * @param location an array of two integers in which to hold the coordinates 12147 */ 12148 public void getLocationOnScreen(int[] location) { 12149 getLocationInWindow(location); 12150 12151 final AttachInfo info = mAttachInfo; 12152 if (info != null) { 12153 location[0] += info.mWindowLeft; 12154 location[1] += info.mWindowTop; 12155 } 12156 } 12157 12158 /** 12159 * <p>Computes the coordinates of this view in its window. The argument 12160 * must be an array of two integers. After the method returns, the array 12161 * contains the x and y location in that order.</p> 12162 * 12163 * @param location an array of two integers in which to hold the coordinates 12164 */ 12165 public void getLocationInWindow(int[] location) { 12166 if (location == null || location.length < 2) { 12167 throw new IllegalArgumentException("location must be an array of two integers"); 12168 } 12169 12170 if (mAttachInfo == null) { 12171 // When the view is not attached to a window, this method does not make sense 12172 location[0] = location[1] = 0; 12173 return; 12174 } 12175 12176 float[] position = mAttachInfo.mTmpTransformLocation; 12177 position[0] = position[1] = 0.0f; 12178 12179 if (!hasIdentityMatrix()) { 12180 getMatrix().mapPoints(position); 12181 } 12182 12183 position[0] += mLeft; 12184 position[1] += mTop; 12185 12186 ViewParent viewParent = mParent; 12187 while (viewParent instanceof View) { 12188 final View view = (View) viewParent; 12189 12190 position[0] -= view.mScrollX; 12191 position[1] -= view.mScrollY; 12192 12193 if (!view.hasIdentityMatrix()) { 12194 view.getMatrix().mapPoints(position); 12195 } 12196 12197 position[0] += view.mLeft; 12198 position[1] += view.mTop; 12199 12200 viewParent = view.mParent; 12201 } 12202 12203 if (viewParent instanceof ViewRootImpl) { 12204 // *cough* 12205 final ViewRootImpl vr = (ViewRootImpl) viewParent; 12206 position[1] -= vr.mCurScrollY; 12207 } 12208 12209 location[0] = (int) (position[0] + 0.5f); 12210 location[1] = (int) (position[1] + 0.5f); 12211 } 12212 12213 /** 12214 * {@hide} 12215 * @param id the id of the view to be found 12216 * @return the view of the specified id, null if cannot be found 12217 */ 12218 protected View findViewTraversal(int id) { 12219 if (id == mID) { 12220 return this; 12221 } 12222 return null; 12223 } 12224 12225 /** 12226 * {@hide} 12227 * @param tag the tag of the view to be found 12228 * @return the view of specified tag, null if cannot be found 12229 */ 12230 protected View findViewWithTagTraversal(Object tag) { 12231 if (tag != null && tag.equals(mTag)) { 12232 return this; 12233 } 12234 return null; 12235 } 12236 12237 /** 12238 * {@hide} 12239 * @param predicate The predicate to evaluate. 12240 * @param childToSkip If not null, ignores this child during the recursive traversal. 12241 * @return The first view that matches the predicate or null. 12242 */ 12243 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 12244 if (predicate.apply(this)) { 12245 return this; 12246 } 12247 return null; 12248 } 12249 12250 /** 12251 * Look for a child view with the given id. If this view has the given 12252 * id, return this view. 12253 * 12254 * @param id The id to search for. 12255 * @return The view that has the given id in the hierarchy or null 12256 */ 12257 public final View findViewById(int id) { 12258 if (id < 0) { 12259 return null; 12260 } 12261 return findViewTraversal(id); 12262 } 12263 12264 /** 12265 * Finds a view by its unuque and stable accessibility id. 12266 * 12267 * @param accessibilityId The searched accessibility id. 12268 * @return The found view. 12269 */ 12270 final View findViewByAccessibilityId(int accessibilityId) { 12271 if (accessibilityId < 0) { 12272 return null; 12273 } 12274 return findViewByAccessibilityIdTraversal(accessibilityId); 12275 } 12276 12277 /** 12278 * Performs the traversal to find a view by its unuque and stable accessibility id. 12279 * 12280 * <strong>Note:</strong>This method does not stop at the root namespace 12281 * boundary since the user can touch the screen at an arbitrary location 12282 * potentially crossing the root namespace bounday which will send an 12283 * accessibility event to accessibility services and they should be able 12284 * to obtain the event source. Also accessibility ids are guaranteed to be 12285 * unique in the window. 12286 * 12287 * @param accessibilityId The accessibility id. 12288 * @return The found view. 12289 */ 12290 View findViewByAccessibilityIdTraversal(int accessibilityId) { 12291 if (getAccessibilityViewId() == accessibilityId) { 12292 return this; 12293 } 12294 return null; 12295 } 12296 12297 /** 12298 * Look for a child view with the given tag. If this view has the given 12299 * tag, return this view. 12300 * 12301 * @param tag The tag to search for, using "tag.equals(getTag())". 12302 * @return The View that has the given tag in the hierarchy or null 12303 */ 12304 public final View findViewWithTag(Object tag) { 12305 if (tag == null) { 12306 return null; 12307 } 12308 return findViewWithTagTraversal(tag); 12309 } 12310 12311 /** 12312 * {@hide} 12313 * Look for a child view that matches the specified predicate. 12314 * If this view matches the predicate, return this view. 12315 * 12316 * @param predicate The predicate to evaluate. 12317 * @return The first view that matches the predicate or null. 12318 */ 12319 public final View findViewByPredicate(Predicate<View> predicate) { 12320 return findViewByPredicateTraversal(predicate, null); 12321 } 12322 12323 /** 12324 * {@hide} 12325 * Look for a child view that matches the specified predicate, 12326 * starting with the specified view and its descendents and then 12327 * recusively searching the ancestors and siblings of that view 12328 * until this view is reached. 12329 * 12330 * This method is useful in cases where the predicate does not match 12331 * a single unique view (perhaps multiple views use the same id) 12332 * and we are trying to find the view that is "closest" in scope to the 12333 * starting view. 12334 * 12335 * @param start The view to start from. 12336 * @param predicate The predicate to evaluate. 12337 * @return The first view that matches the predicate or null. 12338 */ 12339 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 12340 View childToSkip = null; 12341 for (;;) { 12342 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 12343 if (view != null || start == this) { 12344 return view; 12345 } 12346 12347 ViewParent parent = start.getParent(); 12348 if (parent == null || !(parent instanceof View)) { 12349 return null; 12350 } 12351 12352 childToSkip = start; 12353 start = (View) parent; 12354 } 12355 } 12356 12357 /** 12358 * Sets the identifier for this view. The identifier does not have to be 12359 * unique in this view's hierarchy. The identifier should be a positive 12360 * number. 12361 * 12362 * @see #NO_ID 12363 * @see #getId() 12364 * @see #findViewById(int) 12365 * 12366 * @param id a number used to identify the view 12367 * 12368 * @attr ref android.R.styleable#View_id 12369 */ 12370 public void setId(int id) { 12371 mID = id; 12372 } 12373 12374 /** 12375 * {@hide} 12376 * 12377 * @param isRoot true if the view belongs to the root namespace, false 12378 * otherwise 12379 */ 12380 public void setIsRootNamespace(boolean isRoot) { 12381 if (isRoot) { 12382 mPrivateFlags |= IS_ROOT_NAMESPACE; 12383 } else { 12384 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 12385 } 12386 } 12387 12388 /** 12389 * {@hide} 12390 * 12391 * @return true if the view belongs to the root namespace, false otherwise 12392 */ 12393 public boolean isRootNamespace() { 12394 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 12395 } 12396 12397 /** 12398 * Returns this view's identifier. 12399 * 12400 * @return a positive integer used to identify the view or {@link #NO_ID} 12401 * if the view has no ID 12402 * 12403 * @see #setId(int) 12404 * @see #findViewById(int) 12405 * @attr ref android.R.styleable#View_id 12406 */ 12407 @ViewDebug.CapturedViewProperty 12408 public int getId() { 12409 return mID; 12410 } 12411 12412 /** 12413 * Returns this view's tag. 12414 * 12415 * @return the Object stored in this view as a tag 12416 * 12417 * @see #setTag(Object) 12418 * @see #getTag(int) 12419 */ 12420 @ViewDebug.ExportedProperty 12421 public Object getTag() { 12422 return mTag; 12423 } 12424 12425 /** 12426 * Sets the tag associated with this view. A tag can be used to mark 12427 * a view in its hierarchy and does not have to be unique within the 12428 * hierarchy. Tags can also be used to store data within a view without 12429 * resorting to another data structure. 12430 * 12431 * @param tag an Object to tag the view with 12432 * 12433 * @see #getTag() 12434 * @see #setTag(int, Object) 12435 */ 12436 public void setTag(final Object tag) { 12437 mTag = tag; 12438 } 12439 12440 /** 12441 * Returns the tag associated with this view and the specified key. 12442 * 12443 * @param key The key identifying the tag 12444 * 12445 * @return the Object stored in this view as a tag 12446 * 12447 * @see #setTag(int, Object) 12448 * @see #getTag() 12449 */ 12450 public Object getTag(int key) { 12451 if (mKeyedTags != null) return mKeyedTags.get(key); 12452 return null; 12453 } 12454 12455 /** 12456 * Sets a tag associated with this view and a key. A tag can be used 12457 * to mark a view in its hierarchy and does not have to be unique within 12458 * the hierarchy. Tags can also be used to store data within a view 12459 * without resorting to another data structure. 12460 * 12461 * The specified key should be an id declared in the resources of the 12462 * application to ensure it is unique (see the <a 12463 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 12464 * Keys identified as belonging to 12465 * the Android framework or not associated with any package will cause 12466 * an {@link IllegalArgumentException} to be thrown. 12467 * 12468 * @param key The key identifying the tag 12469 * @param tag An Object to tag the view with 12470 * 12471 * @throws IllegalArgumentException If they specified key is not valid 12472 * 12473 * @see #setTag(Object) 12474 * @see #getTag(int) 12475 */ 12476 public void setTag(int key, final Object tag) { 12477 // If the package id is 0x00 or 0x01, it's either an undefined package 12478 // or a framework id 12479 if ((key >>> 24) < 2) { 12480 throw new IllegalArgumentException("The key must be an application-specific " 12481 + "resource id."); 12482 } 12483 12484 setKeyedTag(key, tag); 12485 } 12486 12487 /** 12488 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 12489 * framework id. 12490 * 12491 * @hide 12492 */ 12493 public void setTagInternal(int key, Object tag) { 12494 if ((key >>> 24) != 0x1) { 12495 throw new IllegalArgumentException("The key must be a framework-specific " 12496 + "resource id."); 12497 } 12498 12499 setKeyedTag(key, tag); 12500 } 12501 12502 private void setKeyedTag(int key, Object tag) { 12503 if (mKeyedTags == null) { 12504 mKeyedTags = new SparseArray<Object>(); 12505 } 12506 12507 mKeyedTags.put(key, tag); 12508 } 12509 12510 /** 12511 * @param consistency The type of consistency. See ViewDebug for more information. 12512 * 12513 * @hide 12514 */ 12515 protected boolean dispatchConsistencyCheck(int consistency) { 12516 return onConsistencyCheck(consistency); 12517 } 12518 12519 /** 12520 * Method that subclasses should implement to check their consistency. The type of 12521 * consistency check is indicated by the bit field passed as a parameter. 12522 * 12523 * @param consistency The type of consistency. See ViewDebug for more information. 12524 * 12525 * @throws IllegalStateException if the view is in an inconsistent state. 12526 * 12527 * @hide 12528 */ 12529 protected boolean onConsistencyCheck(int consistency) { 12530 boolean result = true; 12531 12532 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 12533 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 12534 12535 if (checkLayout) { 12536 if (getParent() == null) { 12537 result = false; 12538 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12539 "View " + this + " does not have a parent."); 12540 } 12541 12542 if (mAttachInfo == null) { 12543 result = false; 12544 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12545 "View " + this + " is not attached to a window."); 12546 } 12547 } 12548 12549 if (checkDrawing) { 12550 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 12551 // from their draw() method 12552 12553 if ((mPrivateFlags & DRAWN) != DRAWN && 12554 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 12555 result = false; 12556 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12557 "View " + this + " was invalidated but its drawing cache is valid."); 12558 } 12559 } 12560 12561 return result; 12562 } 12563 12564 /** 12565 * Prints information about this view in the log output, with the tag 12566 * {@link #VIEW_LOG_TAG}. 12567 * 12568 * @hide 12569 */ 12570 public void debug() { 12571 debug(0); 12572 } 12573 12574 /** 12575 * Prints information about this view in the log output, with the tag 12576 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 12577 * indentation defined by the <code>depth</code>. 12578 * 12579 * @param depth the indentation level 12580 * 12581 * @hide 12582 */ 12583 protected void debug(int depth) { 12584 String output = debugIndent(depth - 1); 12585 12586 output += "+ " + this; 12587 int id = getId(); 12588 if (id != -1) { 12589 output += " (id=" + id + ")"; 12590 } 12591 Object tag = getTag(); 12592 if (tag != null) { 12593 output += " (tag=" + tag + ")"; 12594 } 12595 Log.d(VIEW_LOG_TAG, output); 12596 12597 if ((mPrivateFlags & FOCUSED) != 0) { 12598 output = debugIndent(depth) + " FOCUSED"; 12599 Log.d(VIEW_LOG_TAG, output); 12600 } 12601 12602 output = debugIndent(depth); 12603 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 12604 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 12605 + "} "; 12606 Log.d(VIEW_LOG_TAG, output); 12607 12608 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 12609 || mPaddingBottom != 0) { 12610 output = debugIndent(depth); 12611 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 12612 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 12613 Log.d(VIEW_LOG_TAG, output); 12614 } 12615 12616 output = debugIndent(depth); 12617 output += "mMeasureWidth=" + mMeasuredWidth + 12618 " mMeasureHeight=" + mMeasuredHeight; 12619 Log.d(VIEW_LOG_TAG, output); 12620 12621 output = debugIndent(depth); 12622 if (mLayoutParams == null) { 12623 output += "BAD! no layout params"; 12624 } else { 12625 output = mLayoutParams.debug(output); 12626 } 12627 Log.d(VIEW_LOG_TAG, output); 12628 12629 output = debugIndent(depth); 12630 output += "flags={"; 12631 output += View.printFlags(mViewFlags); 12632 output += "}"; 12633 Log.d(VIEW_LOG_TAG, output); 12634 12635 output = debugIndent(depth); 12636 output += "privateFlags={"; 12637 output += View.printPrivateFlags(mPrivateFlags); 12638 output += "}"; 12639 Log.d(VIEW_LOG_TAG, output); 12640 } 12641 12642 /** 12643 * Creates an string of whitespaces used for indentation. 12644 * 12645 * @param depth the indentation level 12646 * @return a String containing (depth * 2 + 3) * 2 white spaces 12647 * 12648 * @hide 12649 */ 12650 protected static String debugIndent(int depth) { 12651 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 12652 for (int i = 0; i < (depth * 2) + 3; i++) { 12653 spaces.append(' ').append(' '); 12654 } 12655 return spaces.toString(); 12656 } 12657 12658 /** 12659 * <p>Return the offset of the widget's text baseline from the widget's top 12660 * boundary. If this widget does not support baseline alignment, this 12661 * method returns -1. </p> 12662 * 12663 * @return the offset of the baseline within the widget's bounds or -1 12664 * if baseline alignment is not supported 12665 */ 12666 @ViewDebug.ExportedProperty(category = "layout") 12667 public int getBaseline() { 12668 return -1; 12669 } 12670 12671 /** 12672 * Call this when something has changed which has invalidated the 12673 * layout of this view. This will schedule a layout pass of the view 12674 * tree. 12675 */ 12676 public void requestLayout() { 12677 if (ViewDebug.TRACE_HIERARCHY) { 12678 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 12679 } 12680 12681 mPrivateFlags |= FORCE_LAYOUT; 12682 mPrivateFlags |= INVALIDATED; 12683 12684 if (mParent != null) { 12685 if (mLayoutParams != null) { 12686 mLayoutParams.resolveWithDirection(getResolvedLayoutDirection()); 12687 } 12688 if (!mParent.isLayoutRequested()) { 12689 mParent.requestLayout(); 12690 } 12691 } 12692 } 12693 12694 /** 12695 * Forces this view to be laid out during the next layout pass. 12696 * This method does not call requestLayout() or forceLayout() 12697 * on the parent. 12698 */ 12699 public void forceLayout() { 12700 mPrivateFlags |= FORCE_LAYOUT; 12701 mPrivateFlags |= INVALIDATED; 12702 } 12703 12704 /** 12705 * <p> 12706 * This is called to find out how big a view should be. The parent 12707 * supplies constraint information in the width and height parameters. 12708 * </p> 12709 * 12710 * <p> 12711 * The actual mesurement work of a view is performed in 12712 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 12713 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 12714 * </p> 12715 * 12716 * 12717 * @param widthMeasureSpec Horizontal space requirements as imposed by the 12718 * parent 12719 * @param heightMeasureSpec Vertical space requirements as imposed by the 12720 * parent 12721 * 12722 * @see #onMeasure(int, int) 12723 */ 12724 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 12725 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 12726 widthMeasureSpec != mOldWidthMeasureSpec || 12727 heightMeasureSpec != mOldHeightMeasureSpec) { 12728 12729 // first clears the measured dimension flag 12730 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 12731 12732 if (ViewDebug.TRACE_HIERARCHY) { 12733 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 12734 } 12735 12736 // measure ourselves, this should set the measured dimension flag back 12737 onMeasure(widthMeasureSpec, heightMeasureSpec); 12738 12739 // flag not set, setMeasuredDimension() was not invoked, we raise 12740 // an exception to warn the developer 12741 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 12742 throw new IllegalStateException("onMeasure() did not set the" 12743 + " measured dimension by calling" 12744 + " setMeasuredDimension()"); 12745 } 12746 12747 mPrivateFlags |= LAYOUT_REQUIRED; 12748 } 12749 12750 mOldWidthMeasureSpec = widthMeasureSpec; 12751 mOldHeightMeasureSpec = heightMeasureSpec; 12752 } 12753 12754 /** 12755 * <p> 12756 * Measure the view and its content to determine the measured width and the 12757 * measured height. This method is invoked by {@link #measure(int, int)} and 12758 * should be overriden by subclasses to provide accurate and efficient 12759 * measurement of their contents. 12760 * </p> 12761 * 12762 * <p> 12763 * <strong>CONTRACT:</strong> When overriding this method, you 12764 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 12765 * measured width and height of this view. Failure to do so will trigger an 12766 * <code>IllegalStateException</code>, thrown by 12767 * {@link #measure(int, int)}. Calling the superclass' 12768 * {@link #onMeasure(int, int)} is a valid use. 12769 * </p> 12770 * 12771 * <p> 12772 * The base class implementation of measure defaults to the background size, 12773 * unless a larger size is allowed by the MeasureSpec. Subclasses should 12774 * override {@link #onMeasure(int, int)} to provide better measurements of 12775 * their content. 12776 * </p> 12777 * 12778 * <p> 12779 * If this method is overridden, it is the subclass's responsibility to make 12780 * sure the measured height and width are at least the view's minimum height 12781 * and width ({@link #getSuggestedMinimumHeight()} and 12782 * {@link #getSuggestedMinimumWidth()}). 12783 * </p> 12784 * 12785 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 12786 * The requirements are encoded with 12787 * {@link android.view.View.MeasureSpec}. 12788 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 12789 * The requirements are encoded with 12790 * {@link android.view.View.MeasureSpec}. 12791 * 12792 * @see #getMeasuredWidth() 12793 * @see #getMeasuredHeight() 12794 * @see #setMeasuredDimension(int, int) 12795 * @see #getSuggestedMinimumHeight() 12796 * @see #getSuggestedMinimumWidth() 12797 * @see android.view.View.MeasureSpec#getMode(int) 12798 * @see android.view.View.MeasureSpec#getSize(int) 12799 */ 12800 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 12801 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 12802 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 12803 } 12804 12805 /** 12806 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 12807 * measured width and measured height. Failing to do so will trigger an 12808 * exception at measurement time.</p> 12809 * 12810 * @param measuredWidth The measured width of this view. May be a complex 12811 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12812 * {@link #MEASURED_STATE_TOO_SMALL}. 12813 * @param measuredHeight The measured height of this view. May be a complex 12814 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12815 * {@link #MEASURED_STATE_TOO_SMALL}. 12816 */ 12817 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 12818 mMeasuredWidth = measuredWidth; 12819 mMeasuredHeight = measuredHeight; 12820 12821 mPrivateFlags |= MEASURED_DIMENSION_SET; 12822 } 12823 12824 /** 12825 * Merge two states as returned by {@link #getMeasuredState()}. 12826 * @param curState The current state as returned from a view or the result 12827 * of combining multiple views. 12828 * @param newState The new view state to combine. 12829 * @return Returns a new integer reflecting the combination of the two 12830 * states. 12831 */ 12832 public static int combineMeasuredStates(int curState, int newState) { 12833 return curState | newState; 12834 } 12835 12836 /** 12837 * Version of {@link #resolveSizeAndState(int, int, int)} 12838 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 12839 */ 12840 public static int resolveSize(int size, int measureSpec) { 12841 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 12842 } 12843 12844 /** 12845 * Utility to reconcile a desired size and state, with constraints imposed 12846 * by a MeasureSpec. Will take the desired size, unless a different size 12847 * is imposed by the constraints. The returned value is a compound integer, 12848 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 12849 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 12850 * size is smaller than the size the view wants to be. 12851 * 12852 * @param size How big the view wants to be 12853 * @param measureSpec Constraints imposed by the parent 12854 * @return Size information bit mask as defined by 12855 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 12856 */ 12857 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 12858 int result = size; 12859 int specMode = MeasureSpec.getMode(measureSpec); 12860 int specSize = MeasureSpec.getSize(measureSpec); 12861 switch (specMode) { 12862 case MeasureSpec.UNSPECIFIED: 12863 result = size; 12864 break; 12865 case MeasureSpec.AT_MOST: 12866 if (specSize < size) { 12867 result = specSize | MEASURED_STATE_TOO_SMALL; 12868 } else { 12869 result = size; 12870 } 12871 break; 12872 case MeasureSpec.EXACTLY: 12873 result = specSize; 12874 break; 12875 } 12876 return result | (childMeasuredState&MEASURED_STATE_MASK); 12877 } 12878 12879 /** 12880 * Utility to return a default size. Uses the supplied size if the 12881 * MeasureSpec imposed no constraints. Will get larger if allowed 12882 * by the MeasureSpec. 12883 * 12884 * @param size Default size for this view 12885 * @param measureSpec Constraints imposed by the parent 12886 * @return The size this view should be. 12887 */ 12888 public static int getDefaultSize(int size, int measureSpec) { 12889 int result = size; 12890 int specMode = MeasureSpec.getMode(measureSpec); 12891 int specSize = MeasureSpec.getSize(measureSpec); 12892 12893 switch (specMode) { 12894 case MeasureSpec.UNSPECIFIED: 12895 result = size; 12896 break; 12897 case MeasureSpec.AT_MOST: 12898 case MeasureSpec.EXACTLY: 12899 result = specSize; 12900 break; 12901 } 12902 return result; 12903 } 12904 12905 /** 12906 * Returns the suggested minimum height that the view should use. This 12907 * returns the maximum of the view's minimum height 12908 * and the background's minimum height 12909 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 12910 * <p> 12911 * When being used in {@link #onMeasure(int, int)}, the caller should still 12912 * ensure the returned height is within the requirements of the parent. 12913 * 12914 * @return The suggested minimum height of the view. 12915 */ 12916 protected int getSuggestedMinimumHeight() { 12917 int suggestedMinHeight = mMinHeight; 12918 12919 if (mBGDrawable != null) { 12920 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 12921 if (suggestedMinHeight < bgMinHeight) { 12922 suggestedMinHeight = bgMinHeight; 12923 } 12924 } 12925 12926 return suggestedMinHeight; 12927 } 12928 12929 /** 12930 * Returns the suggested minimum width that the view should use. This 12931 * returns the maximum of the view's minimum width) 12932 * and the background's minimum width 12933 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 12934 * <p> 12935 * When being used in {@link #onMeasure(int, int)}, the caller should still 12936 * ensure the returned width is within the requirements of the parent. 12937 * 12938 * @return The suggested minimum width of the view. 12939 */ 12940 protected int getSuggestedMinimumWidth() { 12941 int suggestedMinWidth = mMinWidth; 12942 12943 if (mBGDrawable != null) { 12944 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 12945 if (suggestedMinWidth < bgMinWidth) { 12946 suggestedMinWidth = bgMinWidth; 12947 } 12948 } 12949 12950 return suggestedMinWidth; 12951 } 12952 12953 /** 12954 * Sets the minimum height of the view. It is not guaranteed the view will 12955 * be able to achieve this minimum height (for example, if its parent layout 12956 * constrains it with less available height). 12957 * 12958 * @param minHeight The minimum height the view will try to be. 12959 */ 12960 public void setMinimumHeight(int minHeight) { 12961 mMinHeight = minHeight; 12962 } 12963 12964 /** 12965 * Sets the minimum width of the view. It is not guaranteed the view will 12966 * be able to achieve this minimum width (for example, if its parent layout 12967 * constrains it with less available width). 12968 * 12969 * @param minWidth The minimum width the view will try to be. 12970 */ 12971 public void setMinimumWidth(int minWidth) { 12972 mMinWidth = minWidth; 12973 } 12974 12975 /** 12976 * Get the animation currently associated with this view. 12977 * 12978 * @return The animation that is currently playing or 12979 * scheduled to play for this view. 12980 */ 12981 public Animation getAnimation() { 12982 return mCurrentAnimation; 12983 } 12984 12985 /** 12986 * Start the specified animation now. 12987 * 12988 * @param animation the animation to start now 12989 */ 12990 public void startAnimation(Animation animation) { 12991 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 12992 setAnimation(animation); 12993 invalidateParentCaches(); 12994 invalidate(true); 12995 } 12996 12997 /** 12998 * Cancels any animations for this view. 12999 */ 13000 public void clearAnimation() { 13001 if (mCurrentAnimation != null) { 13002 mCurrentAnimation.detach(); 13003 } 13004 mCurrentAnimation = null; 13005 invalidateParentIfNeeded(); 13006 } 13007 13008 /** 13009 * Sets the next animation to play for this view. 13010 * If you want the animation to play immediately, use 13011 * startAnimation. This method provides allows fine-grained 13012 * control over the start time and invalidation, but you 13013 * must make sure that 1) the animation has a start time set, and 13014 * 2) the view will be invalidated when the animation is supposed to 13015 * start. 13016 * 13017 * @param animation The next animation, or null. 13018 */ 13019 public void setAnimation(Animation animation) { 13020 mCurrentAnimation = animation; 13021 if (animation != null) { 13022 animation.reset(); 13023 } 13024 } 13025 13026 /** 13027 * Invoked by a parent ViewGroup to notify the start of the animation 13028 * currently associated with this view. If you override this method, 13029 * always call super.onAnimationStart(); 13030 * 13031 * @see #setAnimation(android.view.animation.Animation) 13032 * @see #getAnimation() 13033 */ 13034 protected void onAnimationStart() { 13035 mPrivateFlags |= ANIMATION_STARTED; 13036 } 13037 13038 /** 13039 * Invoked by a parent ViewGroup to notify the end of the animation 13040 * currently associated with this view. If you override this method, 13041 * always call super.onAnimationEnd(); 13042 * 13043 * @see #setAnimation(android.view.animation.Animation) 13044 * @see #getAnimation() 13045 */ 13046 protected void onAnimationEnd() { 13047 mPrivateFlags &= ~ANIMATION_STARTED; 13048 } 13049 13050 /** 13051 * Invoked if there is a Transform that involves alpha. Subclass that can 13052 * draw themselves with the specified alpha should return true, and then 13053 * respect that alpha when their onDraw() is called. If this returns false 13054 * then the view may be redirected to draw into an offscreen buffer to 13055 * fulfill the request, which will look fine, but may be slower than if the 13056 * subclass handles it internally. The default implementation returns false. 13057 * 13058 * @param alpha The alpha (0..255) to apply to the view's drawing 13059 * @return true if the view can draw with the specified alpha. 13060 */ 13061 protected boolean onSetAlpha(int alpha) { 13062 return false; 13063 } 13064 13065 /** 13066 * This is used by the RootView to perform an optimization when 13067 * the view hierarchy contains one or several SurfaceView. 13068 * SurfaceView is always considered transparent, but its children are not, 13069 * therefore all View objects remove themselves from the global transparent 13070 * region (passed as a parameter to this function). 13071 * 13072 * @param region The transparent region for this ViewAncestor (window). 13073 * 13074 * @return Returns true if the effective visibility of the view at this 13075 * point is opaque, regardless of the transparent region; returns false 13076 * if it is possible for underlying windows to be seen behind the view. 13077 * 13078 * {@hide} 13079 */ 13080 public boolean gatherTransparentRegion(Region region) { 13081 final AttachInfo attachInfo = mAttachInfo; 13082 if (region != null && attachInfo != null) { 13083 final int pflags = mPrivateFlags; 13084 if ((pflags & SKIP_DRAW) == 0) { 13085 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 13086 // remove it from the transparent region. 13087 final int[] location = attachInfo.mTransparentLocation; 13088 getLocationInWindow(location); 13089 region.op(location[0], location[1], location[0] + mRight - mLeft, 13090 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 13091 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 13092 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 13093 // exists, so we remove the background drawable's non-transparent 13094 // parts from this transparent region. 13095 applyDrawableToTransparentRegion(mBGDrawable, region); 13096 } 13097 } 13098 return true; 13099 } 13100 13101 /** 13102 * Play a sound effect for this view. 13103 * 13104 * <p>The framework will play sound effects for some built in actions, such as 13105 * clicking, but you may wish to play these effects in your widget, 13106 * for instance, for internal navigation. 13107 * 13108 * <p>The sound effect will only be played if sound effects are enabled by the user, and 13109 * {@link #isSoundEffectsEnabled()} is true. 13110 * 13111 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 13112 */ 13113 public void playSoundEffect(int soundConstant) { 13114 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 13115 return; 13116 } 13117 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 13118 } 13119 13120 /** 13121 * BZZZTT!!1! 13122 * 13123 * <p>Provide haptic feedback to the user for this view. 13124 * 13125 * <p>The framework will provide haptic feedback for some built in actions, 13126 * such as long presses, but you may wish to provide feedback for your 13127 * own widget. 13128 * 13129 * <p>The feedback will only be performed if 13130 * {@link #isHapticFeedbackEnabled()} is true. 13131 * 13132 * @param feedbackConstant One of the constants defined in 13133 * {@link HapticFeedbackConstants} 13134 */ 13135 public boolean performHapticFeedback(int feedbackConstant) { 13136 return performHapticFeedback(feedbackConstant, 0); 13137 } 13138 13139 /** 13140 * BZZZTT!!1! 13141 * 13142 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 13143 * 13144 * @param feedbackConstant One of the constants defined in 13145 * {@link HapticFeedbackConstants} 13146 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 13147 */ 13148 public boolean performHapticFeedback(int feedbackConstant, int flags) { 13149 if (mAttachInfo == null) { 13150 return false; 13151 } 13152 //noinspection SimplifiableIfStatement 13153 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 13154 && !isHapticFeedbackEnabled()) { 13155 return false; 13156 } 13157 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 13158 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 13159 } 13160 13161 /** 13162 * Request that the visibility of the status bar be changed. 13163 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13164 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13165 */ 13166 public void setSystemUiVisibility(int visibility) { 13167 if (visibility != mSystemUiVisibility) { 13168 mSystemUiVisibility = visibility; 13169 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 13170 mParent.recomputeViewAttributes(this); 13171 } 13172 } 13173 } 13174 13175 /** 13176 * Returns the status bar visibility that this view has requested. 13177 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13178 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13179 */ 13180 public int getSystemUiVisibility() { 13181 return mSystemUiVisibility; 13182 } 13183 13184 /** 13185 * Set a listener to receive callbacks when the visibility of the system bar changes. 13186 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 13187 */ 13188 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 13189 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 13190 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 13191 mParent.recomputeViewAttributes(this); 13192 } 13193 } 13194 13195 /** 13196 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 13197 * the view hierarchy. 13198 */ 13199 public void dispatchSystemUiVisibilityChanged(int visibility) { 13200 ListenerInfo li = mListenerInfo; 13201 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 13202 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 13203 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 13204 } 13205 } 13206 13207 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 13208 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 13209 if (val != mSystemUiVisibility) { 13210 setSystemUiVisibility(val); 13211 } 13212 } 13213 13214 /** 13215 * Creates an image that the system displays during the drag and drop 13216 * operation. This is called a "drag shadow". The default implementation 13217 * for a DragShadowBuilder based on a View returns an image that has exactly the same 13218 * appearance as the given View. The default also positions the center of the drag shadow 13219 * directly under the touch point. If no View is provided (the constructor with no parameters 13220 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 13221 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 13222 * default is an invisible drag shadow. 13223 * <p> 13224 * You are not required to use the View you provide to the constructor as the basis of the 13225 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 13226 * anything you want as the drag shadow. 13227 * </p> 13228 * <p> 13229 * You pass a DragShadowBuilder object to the system when you start the drag. The system 13230 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 13231 * size and position of the drag shadow. It uses this data to construct a 13232 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 13233 * so that your application can draw the shadow image in the Canvas. 13234 * </p> 13235 * 13236 * <div class="special reference"> 13237 * <h3>Developer Guides</h3> 13238 * <p>For a guide to implementing drag and drop features, read the 13239 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 13240 * </div> 13241 */ 13242 public static class DragShadowBuilder { 13243 private final WeakReference<View> mView; 13244 13245 /** 13246 * Constructs a shadow image builder based on a View. By default, the resulting drag 13247 * shadow will have the same appearance and dimensions as the View, with the touch point 13248 * over the center of the View. 13249 * @param view A View. Any View in scope can be used. 13250 */ 13251 public DragShadowBuilder(View view) { 13252 mView = new WeakReference<View>(view); 13253 } 13254 13255 /** 13256 * Construct a shadow builder object with no associated View. This 13257 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 13258 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 13259 * to supply the drag shadow's dimensions and appearance without 13260 * reference to any View object. If they are not overridden, then the result is an 13261 * invisible drag shadow. 13262 */ 13263 public DragShadowBuilder() { 13264 mView = new WeakReference<View>(null); 13265 } 13266 13267 /** 13268 * Returns the View object that had been passed to the 13269 * {@link #View.DragShadowBuilder(View)} 13270 * constructor. If that View parameter was {@code null} or if the 13271 * {@link #View.DragShadowBuilder()} 13272 * constructor was used to instantiate the builder object, this method will return 13273 * null. 13274 * 13275 * @return The View object associate with this builder object. 13276 */ 13277 @SuppressWarnings({"JavadocReference"}) 13278 final public View getView() { 13279 return mView.get(); 13280 } 13281 13282 /** 13283 * Provides the metrics for the shadow image. These include the dimensions of 13284 * the shadow image, and the point within that shadow that should 13285 * be centered under the touch location while dragging. 13286 * <p> 13287 * The default implementation sets the dimensions of the shadow to be the 13288 * same as the dimensions of the View itself and centers the shadow under 13289 * the touch point. 13290 * </p> 13291 * 13292 * @param shadowSize A {@link android.graphics.Point} containing the width and height 13293 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 13294 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 13295 * image. 13296 * 13297 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 13298 * shadow image that should be underneath the touch point during the drag and drop 13299 * operation. Your application must set {@link android.graphics.Point#x} to the 13300 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 13301 */ 13302 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 13303 final View view = mView.get(); 13304 if (view != null) { 13305 shadowSize.set(view.getWidth(), view.getHeight()); 13306 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 13307 } else { 13308 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 13309 } 13310 } 13311 13312 /** 13313 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 13314 * based on the dimensions it received from the 13315 * {@link #onProvideShadowMetrics(Point, Point)} callback. 13316 * 13317 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 13318 */ 13319 public void onDrawShadow(Canvas canvas) { 13320 final View view = mView.get(); 13321 if (view != null) { 13322 view.draw(canvas); 13323 } else { 13324 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 13325 } 13326 } 13327 } 13328 13329 /** 13330 * Starts a drag and drop operation. When your application calls this method, it passes a 13331 * {@link android.view.View.DragShadowBuilder} object to the system. The 13332 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 13333 * to get metrics for the drag shadow, and then calls the object's 13334 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 13335 * <p> 13336 * Once the system has the drag shadow, it begins the drag and drop operation by sending 13337 * drag events to all the View objects in your application that are currently visible. It does 13338 * this either by calling the View object's drag listener (an implementation of 13339 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 13340 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 13341 * Both are passed a {@link android.view.DragEvent} object that has a 13342 * {@link android.view.DragEvent#getAction()} value of 13343 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 13344 * </p> 13345 * <p> 13346 * Your application can invoke startDrag() on any attached View object. The View object does not 13347 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 13348 * be related to the View the user selected for dragging. 13349 * </p> 13350 * @param data A {@link android.content.ClipData} object pointing to the data to be 13351 * transferred by the drag and drop operation. 13352 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 13353 * drag shadow. 13354 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 13355 * drop operation. This Object is put into every DragEvent object sent by the system during the 13356 * current drag. 13357 * <p> 13358 * myLocalState is a lightweight mechanism for the sending information from the dragged View 13359 * to the target Views. For example, it can contain flags that differentiate between a 13360 * a copy operation and a move operation. 13361 * </p> 13362 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 13363 * so the parameter should be set to 0. 13364 * @return {@code true} if the method completes successfully, or 13365 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 13366 * do a drag, and so no drag operation is in progress. 13367 */ 13368 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 13369 Object myLocalState, int flags) { 13370 if (ViewDebug.DEBUG_DRAG) { 13371 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 13372 } 13373 boolean okay = false; 13374 13375 Point shadowSize = new Point(); 13376 Point shadowTouchPoint = new Point(); 13377 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 13378 13379 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 13380 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 13381 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 13382 } 13383 13384 if (ViewDebug.DEBUG_DRAG) { 13385 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 13386 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 13387 } 13388 Surface surface = new Surface(); 13389 try { 13390 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 13391 flags, shadowSize.x, shadowSize.y, surface); 13392 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 13393 + " surface=" + surface); 13394 if (token != null) { 13395 Canvas canvas = surface.lockCanvas(null); 13396 try { 13397 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 13398 shadowBuilder.onDrawShadow(canvas); 13399 } finally { 13400 surface.unlockCanvasAndPost(canvas); 13401 } 13402 13403 final ViewRootImpl root = getViewRootImpl(); 13404 13405 // Cache the local state object for delivery with DragEvents 13406 root.setLocalDragState(myLocalState); 13407 13408 // repurpose 'shadowSize' for the last touch point 13409 root.getLastTouchPoint(shadowSize); 13410 13411 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 13412 shadowSize.x, shadowSize.y, 13413 shadowTouchPoint.x, shadowTouchPoint.y, data); 13414 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 13415 13416 // Off and running! Release our local surface instance; the drag 13417 // shadow surface is now managed by the system process. 13418 surface.release(); 13419 } 13420 } catch (Exception e) { 13421 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 13422 surface.destroy(); 13423 } 13424 13425 return okay; 13426 } 13427 13428 /** 13429 * Handles drag events sent by the system following a call to 13430 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 13431 *<p> 13432 * When the system calls this method, it passes a 13433 * {@link android.view.DragEvent} object. A call to 13434 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 13435 * in DragEvent. The method uses these to determine what is happening in the drag and drop 13436 * operation. 13437 * @param event The {@link android.view.DragEvent} sent by the system. 13438 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 13439 * in DragEvent, indicating the type of drag event represented by this object. 13440 * @return {@code true} if the method was successful, otherwise {@code false}. 13441 * <p> 13442 * The method should return {@code true} in response to an action type of 13443 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 13444 * operation. 13445 * </p> 13446 * <p> 13447 * The method should also return {@code true} in response to an action type of 13448 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 13449 * {@code false} if it didn't. 13450 * </p> 13451 */ 13452 public boolean onDragEvent(DragEvent event) { 13453 return false; 13454 } 13455 13456 /** 13457 * Detects if this View is enabled and has a drag event listener. 13458 * If both are true, then it calls the drag event listener with the 13459 * {@link android.view.DragEvent} it received. If the drag event listener returns 13460 * {@code true}, then dispatchDragEvent() returns {@code true}. 13461 * <p> 13462 * For all other cases, the method calls the 13463 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 13464 * method and returns its result. 13465 * </p> 13466 * <p> 13467 * This ensures that a drag event is always consumed, even if the View does not have a drag 13468 * event listener. However, if the View has a listener and the listener returns true, then 13469 * onDragEvent() is not called. 13470 * </p> 13471 */ 13472 public boolean dispatchDragEvent(DragEvent event) { 13473 //noinspection SimplifiableIfStatement 13474 ListenerInfo li = mListenerInfo; 13475 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 13476 && li.mOnDragListener.onDrag(this, event)) { 13477 return true; 13478 } 13479 return onDragEvent(event); 13480 } 13481 13482 boolean canAcceptDrag() { 13483 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 13484 } 13485 13486 /** 13487 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 13488 * it is ever exposed at all. 13489 * @hide 13490 */ 13491 public void onCloseSystemDialogs(String reason) { 13492 } 13493 13494 /** 13495 * Given a Drawable whose bounds have been set to draw into this view, 13496 * update a Region being computed for 13497 * {@link #gatherTransparentRegion(android.graphics.Region)} so 13498 * that any non-transparent parts of the Drawable are removed from the 13499 * given transparent region. 13500 * 13501 * @param dr The Drawable whose transparency is to be applied to the region. 13502 * @param region A Region holding the current transparency information, 13503 * where any parts of the region that are set are considered to be 13504 * transparent. On return, this region will be modified to have the 13505 * transparency information reduced by the corresponding parts of the 13506 * Drawable that are not transparent. 13507 * {@hide} 13508 */ 13509 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 13510 if (DBG) { 13511 Log.i("View", "Getting transparent region for: " + this); 13512 } 13513 final Region r = dr.getTransparentRegion(); 13514 final Rect db = dr.getBounds(); 13515 final AttachInfo attachInfo = mAttachInfo; 13516 if (r != null && attachInfo != null) { 13517 final int w = getRight()-getLeft(); 13518 final int h = getBottom()-getTop(); 13519 if (db.left > 0) { 13520 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 13521 r.op(0, 0, db.left, h, Region.Op.UNION); 13522 } 13523 if (db.right < w) { 13524 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 13525 r.op(db.right, 0, w, h, Region.Op.UNION); 13526 } 13527 if (db.top > 0) { 13528 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 13529 r.op(0, 0, w, db.top, Region.Op.UNION); 13530 } 13531 if (db.bottom < h) { 13532 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 13533 r.op(0, db.bottom, w, h, Region.Op.UNION); 13534 } 13535 final int[] location = attachInfo.mTransparentLocation; 13536 getLocationInWindow(location); 13537 r.translate(location[0], location[1]); 13538 region.op(r, Region.Op.INTERSECT); 13539 } else { 13540 region.op(db, Region.Op.DIFFERENCE); 13541 } 13542 } 13543 13544 private void checkForLongClick(int delayOffset) { 13545 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 13546 mHasPerformedLongPress = false; 13547 13548 if (mPendingCheckForLongPress == null) { 13549 mPendingCheckForLongPress = new CheckForLongPress(); 13550 } 13551 mPendingCheckForLongPress.rememberWindowAttachCount(); 13552 postDelayed(mPendingCheckForLongPress, 13553 ViewConfiguration.getLongPressTimeout() - delayOffset); 13554 } 13555 } 13556 13557 /** 13558 * Inflate a view from an XML resource. This convenience method wraps the {@link 13559 * LayoutInflater} class, which provides a full range of options for view inflation. 13560 * 13561 * @param context The Context object for your activity or application. 13562 * @param resource The resource ID to inflate 13563 * @param root A view group that will be the parent. Used to properly inflate the 13564 * layout_* parameters. 13565 * @see LayoutInflater 13566 */ 13567 public static View inflate(Context context, int resource, ViewGroup root) { 13568 LayoutInflater factory = LayoutInflater.from(context); 13569 return factory.inflate(resource, root); 13570 } 13571 13572 /** 13573 * Scroll the view with standard behavior for scrolling beyond the normal 13574 * content boundaries. Views that call this method should override 13575 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 13576 * results of an over-scroll operation. 13577 * 13578 * Views can use this method to handle any touch or fling-based scrolling. 13579 * 13580 * @param deltaX Change in X in pixels 13581 * @param deltaY Change in Y in pixels 13582 * @param scrollX Current X scroll value in pixels before applying deltaX 13583 * @param scrollY Current Y scroll value in pixels before applying deltaY 13584 * @param scrollRangeX Maximum content scroll range along the X axis 13585 * @param scrollRangeY Maximum content scroll range along the Y axis 13586 * @param maxOverScrollX Number of pixels to overscroll by in either direction 13587 * along the X axis. 13588 * @param maxOverScrollY Number of pixels to overscroll by in either direction 13589 * along the Y axis. 13590 * @param isTouchEvent true if this scroll operation is the result of a touch event. 13591 * @return true if scrolling was clamped to an over-scroll boundary along either 13592 * axis, false otherwise. 13593 */ 13594 @SuppressWarnings({"UnusedParameters"}) 13595 protected boolean overScrollBy(int deltaX, int deltaY, 13596 int scrollX, int scrollY, 13597 int scrollRangeX, int scrollRangeY, 13598 int maxOverScrollX, int maxOverScrollY, 13599 boolean isTouchEvent) { 13600 final int overScrollMode = mOverScrollMode; 13601 final boolean canScrollHorizontal = 13602 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 13603 final boolean canScrollVertical = 13604 computeVerticalScrollRange() > computeVerticalScrollExtent(); 13605 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 13606 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 13607 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 13608 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 13609 13610 int newScrollX = scrollX + deltaX; 13611 if (!overScrollHorizontal) { 13612 maxOverScrollX = 0; 13613 } 13614 13615 int newScrollY = scrollY + deltaY; 13616 if (!overScrollVertical) { 13617 maxOverScrollY = 0; 13618 } 13619 13620 // Clamp values if at the limits and record 13621 final int left = -maxOverScrollX; 13622 final int right = maxOverScrollX + scrollRangeX; 13623 final int top = -maxOverScrollY; 13624 final int bottom = maxOverScrollY + scrollRangeY; 13625 13626 boolean clampedX = false; 13627 if (newScrollX > right) { 13628 newScrollX = right; 13629 clampedX = true; 13630 } else if (newScrollX < left) { 13631 newScrollX = left; 13632 clampedX = true; 13633 } 13634 13635 boolean clampedY = false; 13636 if (newScrollY > bottom) { 13637 newScrollY = bottom; 13638 clampedY = true; 13639 } else if (newScrollY < top) { 13640 newScrollY = top; 13641 clampedY = true; 13642 } 13643 13644 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 13645 13646 return clampedX || clampedY; 13647 } 13648 13649 /** 13650 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 13651 * respond to the results of an over-scroll operation. 13652 * 13653 * @param scrollX New X scroll value in pixels 13654 * @param scrollY New Y scroll value in pixels 13655 * @param clampedX True if scrollX was clamped to an over-scroll boundary 13656 * @param clampedY True if scrollY was clamped to an over-scroll boundary 13657 */ 13658 protected void onOverScrolled(int scrollX, int scrollY, 13659 boolean clampedX, boolean clampedY) { 13660 // Intentionally empty. 13661 } 13662 13663 /** 13664 * Returns the over-scroll mode for this view. The result will be 13665 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13666 * (allow over-scrolling only if the view content is larger than the container), 13667 * or {@link #OVER_SCROLL_NEVER}. 13668 * 13669 * @return This view's over-scroll mode. 13670 */ 13671 public int getOverScrollMode() { 13672 return mOverScrollMode; 13673 } 13674 13675 /** 13676 * Set the over-scroll mode for this view. Valid over-scroll modes are 13677 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13678 * (allow over-scrolling only if the view content is larger than the container), 13679 * or {@link #OVER_SCROLL_NEVER}. 13680 * 13681 * Setting the over-scroll mode of a view will have an effect only if the 13682 * view is capable of scrolling. 13683 * 13684 * @param overScrollMode The new over-scroll mode for this view. 13685 */ 13686 public void setOverScrollMode(int overScrollMode) { 13687 if (overScrollMode != OVER_SCROLL_ALWAYS && 13688 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 13689 overScrollMode != OVER_SCROLL_NEVER) { 13690 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 13691 } 13692 mOverScrollMode = overScrollMode; 13693 } 13694 13695 /** 13696 * Gets a scale factor that determines the distance the view should scroll 13697 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 13698 * @return The vertical scroll scale factor. 13699 * @hide 13700 */ 13701 protected float getVerticalScrollFactor() { 13702 if (mVerticalScrollFactor == 0) { 13703 TypedValue outValue = new TypedValue(); 13704 if (!mContext.getTheme().resolveAttribute( 13705 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 13706 throw new IllegalStateException( 13707 "Expected theme to define listPreferredItemHeight."); 13708 } 13709 mVerticalScrollFactor = outValue.getDimension( 13710 mContext.getResources().getDisplayMetrics()); 13711 } 13712 return mVerticalScrollFactor; 13713 } 13714 13715 /** 13716 * Gets a scale factor that determines the distance the view should scroll 13717 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 13718 * @return The horizontal scroll scale factor. 13719 * @hide 13720 */ 13721 protected float getHorizontalScrollFactor() { 13722 // TODO: Should use something else. 13723 return getVerticalScrollFactor(); 13724 } 13725 13726 /** 13727 * Return the value specifying the text direction or policy that was set with 13728 * {@link #setTextDirection(int)}. 13729 * 13730 * @return the defined text direction. It can be one of: 13731 * 13732 * {@link #TEXT_DIRECTION_INHERIT}, 13733 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13734 * {@link #TEXT_DIRECTION_ANY_RTL}, 13735 * {@link #TEXT_DIRECTION_LTR}, 13736 * {@link #TEXT_DIRECTION_RTL}, 13737 * {@link #TEXT_DIRECTION_LOCALE}, 13738 * 13739 * @hide 13740 */ 13741 public int getTextDirection() { 13742 return mTextDirection; 13743 } 13744 13745 /** 13746 * Set the text direction. 13747 * 13748 * @param textDirection the direction to set. Should be one of: 13749 * 13750 * {@link #TEXT_DIRECTION_INHERIT}, 13751 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13752 * {@link #TEXT_DIRECTION_ANY_RTL}, 13753 * {@link #TEXT_DIRECTION_LTR}, 13754 * {@link #TEXT_DIRECTION_RTL}, 13755 * {@link #TEXT_DIRECTION_LOCALE}, 13756 * 13757 * @hide 13758 */ 13759 public void setTextDirection(int textDirection) { 13760 if (textDirection != mTextDirection) { 13761 mTextDirection = textDirection; 13762 resetResolvedTextDirection(); 13763 requestLayout(); 13764 } 13765 } 13766 13767 /** 13768 * Return the resolved text direction. 13769 * 13770 * @return the resolved text direction. Return one of: 13771 * 13772 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13773 * {@link #TEXT_DIRECTION_ANY_RTL}, 13774 * {@link #TEXT_DIRECTION_LTR}, 13775 * {@link #TEXT_DIRECTION_RTL}, 13776 * {@link #TEXT_DIRECTION_LOCALE}, 13777 * 13778 * @hide 13779 */ 13780 public int getResolvedTextDirection() { 13781 if (mResolvedTextDirection == TEXT_DIRECTION_INHERIT) { 13782 resolveTextDirection(); 13783 } 13784 return mResolvedTextDirection; 13785 } 13786 13787 /** 13788 * Resolve the text direction. 13789 * 13790 * @hide 13791 */ 13792 protected void resolveTextDirection() { 13793 if (mTextDirection != TEXT_DIRECTION_INHERIT) { 13794 mResolvedTextDirection = mTextDirection; 13795 return; 13796 } 13797 if (mParent != null && mParent instanceof ViewGroup) { 13798 mResolvedTextDirection = ((ViewGroup) mParent).getResolvedTextDirection(); 13799 return; 13800 } 13801 mResolvedTextDirection = TEXT_DIRECTION_FIRST_STRONG; 13802 } 13803 13804 /** 13805 * Reset resolved text direction. Will be resolved during a call to getResolvedTextDirection(). 13806 * 13807 * @hide 13808 */ 13809 protected void resetResolvedTextDirection() { 13810 mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 13811 } 13812 13813 // 13814 // Properties 13815 // 13816 /** 13817 * A Property wrapper around the <code>alpha</code> functionality handled by the 13818 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 13819 */ 13820 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 13821 @Override 13822 public void setValue(View object, float value) { 13823 object.setAlpha(value); 13824 } 13825 13826 @Override 13827 public Float get(View object) { 13828 return object.getAlpha(); 13829 } 13830 }; 13831 13832 /** 13833 * A Property wrapper around the <code>translationX</code> functionality handled by the 13834 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 13835 */ 13836 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 13837 @Override 13838 public void setValue(View object, float value) { 13839 object.setTranslationX(value); 13840 } 13841 13842 @Override 13843 public Float get(View object) { 13844 return object.getTranslationX(); 13845 } 13846 }; 13847 13848 /** 13849 * A Property wrapper around the <code>translationY</code> functionality handled by the 13850 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 13851 */ 13852 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 13853 @Override 13854 public void setValue(View object, float value) { 13855 object.setTranslationY(value); 13856 } 13857 13858 @Override 13859 public Float get(View object) { 13860 return object.getTranslationY(); 13861 } 13862 }; 13863 13864 /** 13865 * A Property wrapper around the <code>x</code> functionality handled by the 13866 * {@link View#setX(float)} and {@link View#getX()} methods. 13867 */ 13868 public static final Property<View, Float> X = new FloatProperty<View>("x") { 13869 @Override 13870 public void setValue(View object, float value) { 13871 object.setX(value); 13872 } 13873 13874 @Override 13875 public Float get(View object) { 13876 return object.getX(); 13877 } 13878 }; 13879 13880 /** 13881 * A Property wrapper around the <code>y</code> functionality handled by the 13882 * {@link View#setY(float)} and {@link View#getY()} methods. 13883 */ 13884 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 13885 @Override 13886 public void setValue(View object, float value) { 13887 object.setY(value); 13888 } 13889 13890 @Override 13891 public Float get(View object) { 13892 return object.getY(); 13893 } 13894 }; 13895 13896 /** 13897 * A Property wrapper around the <code>rotation</code> functionality handled by the 13898 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 13899 */ 13900 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 13901 @Override 13902 public void setValue(View object, float value) { 13903 object.setRotation(value); 13904 } 13905 13906 @Override 13907 public Float get(View object) { 13908 return object.getRotation(); 13909 } 13910 }; 13911 13912 /** 13913 * A Property wrapper around the <code>rotationX</code> functionality handled by the 13914 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 13915 */ 13916 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 13917 @Override 13918 public void setValue(View object, float value) { 13919 object.setRotationX(value); 13920 } 13921 13922 @Override 13923 public Float get(View object) { 13924 return object.getRotationX(); 13925 } 13926 }; 13927 13928 /** 13929 * A Property wrapper around the <code>rotationY</code> functionality handled by the 13930 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 13931 */ 13932 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 13933 @Override 13934 public void setValue(View object, float value) { 13935 object.setRotationY(value); 13936 } 13937 13938 @Override 13939 public Float get(View object) { 13940 return object.getRotationY(); 13941 } 13942 }; 13943 13944 /** 13945 * A Property wrapper around the <code>scaleX</code> functionality handled by the 13946 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 13947 */ 13948 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 13949 @Override 13950 public void setValue(View object, float value) { 13951 object.setScaleX(value); 13952 } 13953 13954 @Override 13955 public Float get(View object) { 13956 return object.getScaleX(); 13957 } 13958 }; 13959 13960 /** 13961 * A Property wrapper around the <code>scaleY</code> functionality handled by the 13962 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 13963 */ 13964 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 13965 @Override 13966 public void setValue(View object, float value) { 13967 object.setScaleY(value); 13968 } 13969 13970 @Override 13971 public Float get(View object) { 13972 return object.getScaleY(); 13973 } 13974 }; 13975 13976 /** 13977 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 13978 * Each MeasureSpec represents a requirement for either the width or the height. 13979 * A MeasureSpec is comprised of a size and a mode. There are three possible 13980 * modes: 13981 * <dl> 13982 * <dt>UNSPECIFIED</dt> 13983 * <dd> 13984 * The parent has not imposed any constraint on the child. It can be whatever size 13985 * it wants. 13986 * </dd> 13987 * 13988 * <dt>EXACTLY</dt> 13989 * <dd> 13990 * The parent has determined an exact size for the child. The child is going to be 13991 * given those bounds regardless of how big it wants to be. 13992 * </dd> 13993 * 13994 * <dt>AT_MOST</dt> 13995 * <dd> 13996 * The child can be as large as it wants up to the specified size. 13997 * </dd> 13998 * </dl> 13999 * 14000 * MeasureSpecs are implemented as ints to reduce object allocation. This class 14001 * is provided to pack and unpack the <size, mode> tuple into the int. 14002 */ 14003 public static class MeasureSpec { 14004 private static final int MODE_SHIFT = 30; 14005 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 14006 14007 /** 14008 * Measure specification mode: The parent has not imposed any constraint 14009 * on the child. It can be whatever size it wants. 14010 */ 14011 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 14012 14013 /** 14014 * Measure specification mode: The parent has determined an exact size 14015 * for the child. The child is going to be given those bounds regardless 14016 * of how big it wants to be. 14017 */ 14018 public static final int EXACTLY = 1 << MODE_SHIFT; 14019 14020 /** 14021 * Measure specification mode: The child can be as large as it wants up 14022 * to the specified size. 14023 */ 14024 public static final int AT_MOST = 2 << MODE_SHIFT; 14025 14026 /** 14027 * Creates a measure specification based on the supplied size and mode. 14028 * 14029 * The mode must always be one of the following: 14030 * <ul> 14031 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 14032 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 14033 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 14034 * </ul> 14035 * 14036 * @param size the size of the measure specification 14037 * @param mode the mode of the measure specification 14038 * @return the measure specification based on size and mode 14039 */ 14040 public static int makeMeasureSpec(int size, int mode) { 14041 return size + mode; 14042 } 14043 14044 /** 14045 * Extracts the mode from the supplied measure specification. 14046 * 14047 * @param measureSpec the measure specification to extract the mode from 14048 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 14049 * {@link android.view.View.MeasureSpec#AT_MOST} or 14050 * {@link android.view.View.MeasureSpec#EXACTLY} 14051 */ 14052 public static int getMode(int measureSpec) { 14053 return (measureSpec & MODE_MASK); 14054 } 14055 14056 /** 14057 * Extracts the size from the supplied measure specification. 14058 * 14059 * @param measureSpec the measure specification to extract the size from 14060 * @return the size in pixels defined in the supplied measure specification 14061 */ 14062 public static int getSize(int measureSpec) { 14063 return (measureSpec & ~MODE_MASK); 14064 } 14065 14066 /** 14067 * Returns a String representation of the specified measure 14068 * specification. 14069 * 14070 * @param measureSpec the measure specification to convert to a String 14071 * @return a String with the following format: "MeasureSpec: MODE SIZE" 14072 */ 14073 public static String toString(int measureSpec) { 14074 int mode = getMode(measureSpec); 14075 int size = getSize(measureSpec); 14076 14077 StringBuilder sb = new StringBuilder("MeasureSpec: "); 14078 14079 if (mode == UNSPECIFIED) 14080 sb.append("UNSPECIFIED "); 14081 else if (mode == EXACTLY) 14082 sb.append("EXACTLY "); 14083 else if (mode == AT_MOST) 14084 sb.append("AT_MOST "); 14085 else 14086 sb.append(mode).append(" "); 14087 14088 sb.append(size); 14089 return sb.toString(); 14090 } 14091 } 14092 14093 class CheckForLongPress implements Runnable { 14094 14095 private int mOriginalWindowAttachCount; 14096 14097 public void run() { 14098 if (isPressed() && (mParent != null) 14099 && mOriginalWindowAttachCount == mWindowAttachCount) { 14100 if (performLongClick()) { 14101 mHasPerformedLongPress = true; 14102 } 14103 } 14104 } 14105 14106 public void rememberWindowAttachCount() { 14107 mOriginalWindowAttachCount = mWindowAttachCount; 14108 } 14109 } 14110 14111 private final class CheckForTap implements Runnable { 14112 public void run() { 14113 mPrivateFlags &= ~PREPRESSED; 14114 mPrivateFlags |= PRESSED; 14115 refreshDrawableState(); 14116 checkForLongClick(ViewConfiguration.getTapTimeout()); 14117 } 14118 } 14119 14120 private final class PerformClick implements Runnable { 14121 public void run() { 14122 performClick(); 14123 } 14124 } 14125 14126 /** @hide */ 14127 public void hackTurnOffWindowResizeAnim(boolean off) { 14128 mAttachInfo.mTurnOffWindowResizeAnim = off; 14129 } 14130 14131 /** 14132 * This method returns a ViewPropertyAnimator object, which can be used to animate 14133 * specific properties on this View. 14134 * 14135 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 14136 */ 14137 public ViewPropertyAnimator animate() { 14138 if (mAnimator == null) { 14139 mAnimator = new ViewPropertyAnimator(this); 14140 } 14141 return mAnimator; 14142 } 14143 14144 /** 14145 * Interface definition for a callback to be invoked when a key event is 14146 * dispatched to this view. The callback will be invoked before the key 14147 * event is given to the view. 14148 */ 14149 public interface OnKeyListener { 14150 /** 14151 * Called when a key is dispatched to a view. This allows listeners to 14152 * get a chance to respond before the target view. 14153 * 14154 * @param v The view the key has been dispatched to. 14155 * @param keyCode The code for the physical key that was pressed 14156 * @param event The KeyEvent object containing full information about 14157 * the event. 14158 * @return True if the listener has consumed the event, false otherwise. 14159 */ 14160 boolean onKey(View v, int keyCode, KeyEvent event); 14161 } 14162 14163 /** 14164 * Interface definition for a callback to be invoked when a touch event is 14165 * dispatched to this view. The callback will be invoked before the touch 14166 * event is given to the view. 14167 */ 14168 public interface OnTouchListener { 14169 /** 14170 * Called when a touch event is dispatched to a view. This allows listeners to 14171 * get a chance to respond before the target view. 14172 * 14173 * @param v The view the touch event has been dispatched to. 14174 * @param event The MotionEvent object containing full information about 14175 * the event. 14176 * @return True if the listener has consumed the event, false otherwise. 14177 */ 14178 boolean onTouch(View v, MotionEvent event); 14179 } 14180 14181 /** 14182 * Interface definition for a callback to be invoked when a hover event is 14183 * dispatched to this view. The callback will be invoked before the hover 14184 * event is given to the view. 14185 */ 14186 public interface OnHoverListener { 14187 /** 14188 * Called when a hover event is dispatched to a view. This allows listeners to 14189 * get a chance to respond before the target view. 14190 * 14191 * @param v The view the hover event has been dispatched to. 14192 * @param event The MotionEvent object containing full information about 14193 * the event. 14194 * @return True if the listener has consumed the event, false otherwise. 14195 */ 14196 boolean onHover(View v, MotionEvent event); 14197 } 14198 14199 /** 14200 * Interface definition for a callback to be invoked when a generic motion event is 14201 * dispatched to this view. The callback will be invoked before the generic motion 14202 * event is given to the view. 14203 */ 14204 public interface OnGenericMotionListener { 14205 /** 14206 * Called when a generic motion event is dispatched to a view. This allows listeners to 14207 * get a chance to respond before the target view. 14208 * 14209 * @param v The view the generic motion event has been dispatched to. 14210 * @param event The MotionEvent object containing full information about 14211 * the event. 14212 * @return True if the listener has consumed the event, false otherwise. 14213 */ 14214 boolean onGenericMotion(View v, MotionEvent event); 14215 } 14216 14217 /** 14218 * Interface definition for a callback to be invoked when a view has been clicked and held. 14219 */ 14220 public interface OnLongClickListener { 14221 /** 14222 * Called when a view has been clicked and held. 14223 * 14224 * @param v The view that was clicked and held. 14225 * 14226 * @return true if the callback consumed the long click, false otherwise. 14227 */ 14228 boolean onLongClick(View v); 14229 } 14230 14231 /** 14232 * Interface definition for a callback to be invoked when a drag is being dispatched 14233 * to this view. The callback will be invoked before the hosting view's own 14234 * onDrag(event) method. If the listener wants to fall back to the hosting view's 14235 * onDrag(event) behavior, it should return 'false' from this callback. 14236 * 14237 * <div class="special reference"> 14238 * <h3>Developer Guides</h3> 14239 * <p>For a guide to implementing drag and drop features, read the 14240 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 14241 * </div> 14242 */ 14243 public interface OnDragListener { 14244 /** 14245 * Called when a drag event is dispatched to a view. This allows listeners 14246 * to get a chance to override base View behavior. 14247 * 14248 * @param v The View that received the drag event. 14249 * @param event The {@link android.view.DragEvent} object for the drag event. 14250 * @return {@code true} if the drag event was handled successfully, or {@code false} 14251 * if the drag event was not handled. Note that {@code false} will trigger the View 14252 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 14253 */ 14254 boolean onDrag(View v, DragEvent event); 14255 } 14256 14257 /** 14258 * Interface definition for a callback to be invoked when the focus state of 14259 * a view changed. 14260 */ 14261 public interface OnFocusChangeListener { 14262 /** 14263 * Called when the focus state of a view has changed. 14264 * 14265 * @param v The view whose state has changed. 14266 * @param hasFocus The new focus state of v. 14267 */ 14268 void onFocusChange(View v, boolean hasFocus); 14269 } 14270 14271 /** 14272 * Interface definition for a callback to be invoked when a view is clicked. 14273 */ 14274 public interface OnClickListener { 14275 /** 14276 * Called when a view has been clicked. 14277 * 14278 * @param v The view that was clicked. 14279 */ 14280 void onClick(View v); 14281 } 14282 14283 /** 14284 * Interface definition for a callback to be invoked when the context menu 14285 * for this view is being built. 14286 */ 14287 public interface OnCreateContextMenuListener { 14288 /** 14289 * Called when the context menu for this view is being built. It is not 14290 * safe to hold onto the menu after this method returns. 14291 * 14292 * @param menu The context menu that is being built 14293 * @param v The view for which the context menu is being built 14294 * @param menuInfo Extra information about the item for which the 14295 * context menu should be shown. This information will vary 14296 * depending on the class of v. 14297 */ 14298 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 14299 } 14300 14301 /** 14302 * Interface definition for a callback to be invoked when the status bar changes 14303 * visibility. This reports <strong>global</strong> changes to the system UI 14304 * state, not just what the application is requesting. 14305 * 14306 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 14307 */ 14308 public interface OnSystemUiVisibilityChangeListener { 14309 /** 14310 * Called when the status bar changes visibility because of a call to 14311 * {@link View#setSystemUiVisibility(int)}. 14312 * 14313 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 14314 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. This tells you the 14315 * <strong>global</strong> state of the UI visibility flags, not what your 14316 * app is currently applying. 14317 */ 14318 public void onSystemUiVisibilityChange(int visibility); 14319 } 14320 14321 /** 14322 * Interface definition for a callback to be invoked when this view is attached 14323 * or detached from its window. 14324 */ 14325 public interface OnAttachStateChangeListener { 14326 /** 14327 * Called when the view is attached to a window. 14328 * @param v The view that was attached 14329 */ 14330 public void onViewAttachedToWindow(View v); 14331 /** 14332 * Called when the view is detached from a window. 14333 * @param v The view that was detached 14334 */ 14335 public void onViewDetachedFromWindow(View v); 14336 } 14337 14338 private final class UnsetPressedState implements Runnable { 14339 public void run() { 14340 setPressed(false); 14341 } 14342 } 14343 14344 /** 14345 * Base class for derived classes that want to save and restore their own 14346 * state in {@link android.view.View#onSaveInstanceState()}. 14347 */ 14348 public static class BaseSavedState extends AbsSavedState { 14349 /** 14350 * Constructor used when reading from a parcel. Reads the state of the superclass. 14351 * 14352 * @param source 14353 */ 14354 public BaseSavedState(Parcel source) { 14355 super(source); 14356 } 14357 14358 /** 14359 * Constructor called by derived classes when creating their SavedState objects 14360 * 14361 * @param superState The state of the superclass of this view 14362 */ 14363 public BaseSavedState(Parcelable superState) { 14364 super(superState); 14365 } 14366 14367 public static final Parcelable.Creator<BaseSavedState> CREATOR = 14368 new Parcelable.Creator<BaseSavedState>() { 14369 public BaseSavedState createFromParcel(Parcel in) { 14370 return new BaseSavedState(in); 14371 } 14372 14373 public BaseSavedState[] newArray(int size) { 14374 return new BaseSavedState[size]; 14375 } 14376 }; 14377 } 14378 14379 /** 14380 * A set of information given to a view when it is attached to its parent 14381 * window. 14382 */ 14383 static class AttachInfo { 14384 interface Callbacks { 14385 void playSoundEffect(int effectId); 14386 boolean performHapticFeedback(int effectId, boolean always); 14387 } 14388 14389 /** 14390 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 14391 * to a Handler. This class contains the target (View) to invalidate and 14392 * the coordinates of the dirty rectangle. 14393 * 14394 * For performance purposes, this class also implements a pool of up to 14395 * POOL_LIMIT objects that get reused. This reduces memory allocations 14396 * whenever possible. 14397 */ 14398 static class InvalidateInfo implements Poolable<InvalidateInfo> { 14399 private static final int POOL_LIMIT = 10; 14400 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 14401 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 14402 public InvalidateInfo newInstance() { 14403 return new InvalidateInfo(); 14404 } 14405 14406 public void onAcquired(InvalidateInfo element) { 14407 } 14408 14409 public void onReleased(InvalidateInfo element) { 14410 element.target = null; 14411 } 14412 }, POOL_LIMIT) 14413 ); 14414 14415 private InvalidateInfo mNext; 14416 private boolean mIsPooled; 14417 14418 View target; 14419 14420 int left; 14421 int top; 14422 int right; 14423 int bottom; 14424 14425 public void setNextPoolable(InvalidateInfo element) { 14426 mNext = element; 14427 } 14428 14429 public InvalidateInfo getNextPoolable() { 14430 return mNext; 14431 } 14432 14433 static InvalidateInfo acquire() { 14434 return sPool.acquire(); 14435 } 14436 14437 void release() { 14438 sPool.release(this); 14439 } 14440 14441 public boolean isPooled() { 14442 return mIsPooled; 14443 } 14444 14445 public void setPooled(boolean isPooled) { 14446 mIsPooled = isPooled; 14447 } 14448 } 14449 14450 final IWindowSession mSession; 14451 14452 final IWindow mWindow; 14453 14454 final IBinder mWindowToken; 14455 14456 final Callbacks mRootCallbacks; 14457 14458 HardwareCanvas mHardwareCanvas; 14459 14460 /** 14461 * The top view of the hierarchy. 14462 */ 14463 View mRootView; 14464 14465 IBinder mPanelParentWindowToken; 14466 Surface mSurface; 14467 14468 boolean mHardwareAccelerated; 14469 boolean mHardwareAccelerationRequested; 14470 HardwareRenderer mHardwareRenderer; 14471 14472 /** 14473 * Scale factor used by the compatibility mode 14474 */ 14475 float mApplicationScale; 14476 14477 /** 14478 * Indicates whether the application is in compatibility mode 14479 */ 14480 boolean mScalingRequired; 14481 14482 /** 14483 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 14484 */ 14485 boolean mTurnOffWindowResizeAnim; 14486 14487 /** 14488 * Left position of this view's window 14489 */ 14490 int mWindowLeft; 14491 14492 /** 14493 * Top position of this view's window 14494 */ 14495 int mWindowTop; 14496 14497 /** 14498 * Indicates whether views need to use 32-bit drawing caches 14499 */ 14500 boolean mUse32BitDrawingCache; 14501 14502 /** 14503 * For windows that are full-screen but using insets to layout inside 14504 * of the screen decorations, these are the current insets for the 14505 * content of the window. 14506 */ 14507 final Rect mContentInsets = new Rect(); 14508 14509 /** 14510 * For windows that are full-screen but using insets to layout inside 14511 * of the screen decorations, these are the current insets for the 14512 * actual visible parts of the window. 14513 */ 14514 final Rect mVisibleInsets = new Rect(); 14515 14516 /** 14517 * The internal insets given by this window. This value is 14518 * supplied by the client (through 14519 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 14520 * be given to the window manager when changed to be used in laying 14521 * out windows behind it. 14522 */ 14523 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 14524 = new ViewTreeObserver.InternalInsetsInfo(); 14525 14526 /** 14527 * All views in the window's hierarchy that serve as scroll containers, 14528 * used to determine if the window can be resized or must be panned 14529 * to adjust for a soft input area. 14530 */ 14531 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 14532 14533 final KeyEvent.DispatcherState mKeyDispatchState 14534 = new KeyEvent.DispatcherState(); 14535 14536 /** 14537 * Indicates whether the view's window currently has the focus. 14538 */ 14539 boolean mHasWindowFocus; 14540 14541 /** 14542 * The current visibility of the window. 14543 */ 14544 int mWindowVisibility; 14545 14546 /** 14547 * Indicates the time at which drawing started to occur. 14548 */ 14549 long mDrawingTime; 14550 14551 /** 14552 * Indicates whether or not ignoring the DIRTY_MASK flags. 14553 */ 14554 boolean mIgnoreDirtyState; 14555 14556 /** 14557 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 14558 * to avoid clearing that flag prematurely. 14559 */ 14560 boolean mSetIgnoreDirtyState = false; 14561 14562 /** 14563 * Indicates whether the view's window is currently in touch mode. 14564 */ 14565 boolean mInTouchMode; 14566 14567 /** 14568 * Indicates that ViewAncestor should trigger a global layout change 14569 * the next time it performs a traversal 14570 */ 14571 boolean mRecomputeGlobalAttributes; 14572 14573 /** 14574 * Always report new attributes at next traversal. 14575 */ 14576 boolean mForceReportNewAttributes; 14577 14578 /** 14579 * Set during a traveral if any views want to keep the screen on. 14580 */ 14581 boolean mKeepScreenOn; 14582 14583 /** 14584 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 14585 */ 14586 int mSystemUiVisibility; 14587 14588 /** 14589 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 14590 * attached. 14591 */ 14592 boolean mHasSystemUiListeners; 14593 14594 /** 14595 * Set if the visibility of any views has changed. 14596 */ 14597 boolean mViewVisibilityChanged; 14598 14599 /** 14600 * Set to true if a view has been scrolled. 14601 */ 14602 boolean mViewScrollChanged; 14603 14604 /** 14605 * Global to the view hierarchy used as a temporary for dealing with 14606 * x/y points in the transparent region computations. 14607 */ 14608 final int[] mTransparentLocation = new int[2]; 14609 14610 /** 14611 * Global to the view hierarchy used as a temporary for dealing with 14612 * x/y points in the ViewGroup.invalidateChild implementation. 14613 */ 14614 final int[] mInvalidateChildLocation = new int[2]; 14615 14616 14617 /** 14618 * Global to the view hierarchy used as a temporary for dealing with 14619 * x/y location when view is transformed. 14620 */ 14621 final float[] mTmpTransformLocation = new float[2]; 14622 14623 /** 14624 * The view tree observer used to dispatch global events like 14625 * layout, pre-draw, touch mode change, etc. 14626 */ 14627 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 14628 14629 /** 14630 * A Canvas used by the view hierarchy to perform bitmap caching. 14631 */ 14632 Canvas mCanvas; 14633 14634 /** 14635 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 14636 * handler can be used to pump events in the UI events queue. 14637 */ 14638 final Handler mHandler; 14639 14640 /** 14641 * Identifier for messages requesting the view to be invalidated. 14642 * Such messages should be sent to {@link #mHandler}. 14643 */ 14644 static final int INVALIDATE_MSG = 0x1; 14645 14646 /** 14647 * Identifier for messages requesting the view to invalidate a region. 14648 * Such messages should be sent to {@link #mHandler}. 14649 */ 14650 static final int INVALIDATE_RECT_MSG = 0x2; 14651 14652 /** 14653 * Temporary for use in computing invalidate rectangles while 14654 * calling up the hierarchy. 14655 */ 14656 final Rect mTmpInvalRect = new Rect(); 14657 14658 /** 14659 * Temporary for use in computing hit areas with transformed views 14660 */ 14661 final RectF mTmpTransformRect = new RectF(); 14662 14663 /** 14664 * Temporary list for use in collecting focusable descendents of a view. 14665 */ 14666 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 14667 14668 /** 14669 * The id of the window for accessibility purposes. 14670 */ 14671 int mAccessibilityWindowId = View.NO_ID; 14672 14673 /** 14674 * Creates a new set of attachment information with the specified 14675 * events handler and thread. 14676 * 14677 * @param handler the events handler the view must use 14678 */ 14679 AttachInfo(IWindowSession session, IWindow window, 14680 Handler handler, Callbacks effectPlayer) { 14681 mSession = session; 14682 mWindow = window; 14683 mWindowToken = window.asBinder(); 14684 mHandler = handler; 14685 mRootCallbacks = effectPlayer; 14686 } 14687 } 14688 14689 /** 14690 * <p>ScrollabilityCache holds various fields used by a View when scrolling 14691 * is supported. This avoids keeping too many unused fields in most 14692 * instances of View.</p> 14693 */ 14694 private static class ScrollabilityCache implements Runnable { 14695 14696 /** 14697 * Scrollbars are not visible 14698 */ 14699 public static final int OFF = 0; 14700 14701 /** 14702 * Scrollbars are visible 14703 */ 14704 public static final int ON = 1; 14705 14706 /** 14707 * Scrollbars are fading away 14708 */ 14709 public static final int FADING = 2; 14710 14711 public boolean fadeScrollBars; 14712 14713 public int fadingEdgeLength; 14714 public int scrollBarDefaultDelayBeforeFade; 14715 public int scrollBarFadeDuration; 14716 14717 public int scrollBarSize; 14718 public ScrollBarDrawable scrollBar; 14719 public float[] interpolatorValues; 14720 public View host; 14721 14722 public final Paint paint; 14723 public final Matrix matrix; 14724 public Shader shader; 14725 14726 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 14727 14728 private static final float[] OPAQUE = { 255 }; 14729 private static final float[] TRANSPARENT = { 0.0f }; 14730 14731 /** 14732 * When fading should start. This time moves into the future every time 14733 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 14734 */ 14735 public long fadeStartTime; 14736 14737 14738 /** 14739 * The current state of the scrollbars: ON, OFF, or FADING 14740 */ 14741 public int state = OFF; 14742 14743 private int mLastColor; 14744 14745 public ScrollabilityCache(ViewConfiguration configuration, View host) { 14746 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 14747 scrollBarSize = configuration.getScaledScrollBarSize(); 14748 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 14749 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 14750 14751 paint = new Paint(); 14752 matrix = new Matrix(); 14753 // use use a height of 1, and then wack the matrix each time we 14754 // actually use it. 14755 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 14756 14757 paint.setShader(shader); 14758 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 14759 this.host = host; 14760 } 14761 14762 public void setFadeColor(int color) { 14763 if (color != 0 && color != mLastColor) { 14764 mLastColor = color; 14765 color |= 0xFF000000; 14766 14767 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 14768 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 14769 14770 paint.setShader(shader); 14771 // Restore the default transfer mode (src_over) 14772 paint.setXfermode(null); 14773 } 14774 } 14775 14776 public void run() { 14777 long now = AnimationUtils.currentAnimationTimeMillis(); 14778 if (now >= fadeStartTime) { 14779 14780 // the animation fades the scrollbars out by changing 14781 // the opacity (alpha) from fully opaque to fully 14782 // transparent 14783 int nextFrame = (int) now; 14784 int framesCount = 0; 14785 14786 Interpolator interpolator = scrollBarInterpolator; 14787 14788 // Start opaque 14789 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 14790 14791 // End transparent 14792 nextFrame += scrollBarFadeDuration; 14793 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 14794 14795 state = FADING; 14796 14797 // Kick off the fade animation 14798 host.invalidate(true); 14799 } 14800 } 14801 } 14802 14803 /** 14804 * Resuable callback for sending 14805 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 14806 */ 14807 private class SendViewScrolledAccessibilityEvent implements Runnable { 14808 public volatile boolean mIsPending; 14809 14810 public void run() { 14811 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 14812 mIsPending = false; 14813 } 14814 } 14815 14816 /** 14817 * <p> 14818 * This class represents a delegate that can be registered in a {@link View} 14819 * to enhance accessibility support via composition rather via inheritance. 14820 * It is specifically targeted to widget developers that extend basic View 14821 * classes i.e. classes in package android.view, that would like their 14822 * applications to be backwards compatible. 14823 * </p> 14824 * <p> 14825 * A scenario in which a developer would like to use an accessibility delegate 14826 * is overriding a method introduced in a later API version then the minimal API 14827 * version supported by the application. For example, the method 14828 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 14829 * in API version 4 when the accessibility APIs were first introduced. If a 14830 * developer would like his application to run on API version 4 devices (assuming 14831 * all other APIs used by the application are version 4 or lower) and take advantage 14832 * of this method, instead of overriding the method which would break the application's 14833 * backwards compatibility, he can override the corresponding method in this 14834 * delegate and register the delegate in the target View if the API version of 14835 * the system is high enough i.e. the API version is same or higher to the API 14836 * version that introduced 14837 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 14838 * </p> 14839 * <p> 14840 * Here is an example implementation: 14841 * </p> 14842 * <code><pre><p> 14843 * if (Build.VERSION.SDK_INT >= 14) { 14844 * // If the API version is equal of higher than the version in 14845 * // which onInitializeAccessibilityNodeInfo was introduced we 14846 * // register a delegate with a customized implementation. 14847 * View view = findViewById(R.id.view_id); 14848 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 14849 * public void onInitializeAccessibilityNodeInfo(View host, 14850 * AccessibilityNodeInfo info) { 14851 * // Let the default implementation populate the info. 14852 * super.onInitializeAccessibilityNodeInfo(host, info); 14853 * // Set some other information. 14854 * info.setEnabled(host.isEnabled()); 14855 * } 14856 * }); 14857 * } 14858 * </code></pre></p> 14859 * <p> 14860 * This delegate contains methods that correspond to the accessibility methods 14861 * in View. If a delegate has been specified the implementation in View hands 14862 * off handling to the corresponding method in this delegate. The default 14863 * implementation the delegate methods behaves exactly as the corresponding 14864 * method in View for the case of no accessibility delegate been set. Hence, 14865 * to customize the behavior of a View method, clients can override only the 14866 * corresponding delegate method without altering the behavior of the rest 14867 * accessibility related methods of the host view. 14868 * </p> 14869 */ 14870 public static class AccessibilityDelegate { 14871 14872 /** 14873 * Sends an accessibility event of the given type. If accessibility is not 14874 * enabled this method has no effect. 14875 * <p> 14876 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 14877 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 14878 * been set. 14879 * </p> 14880 * 14881 * @param host The View hosting the delegate. 14882 * @param eventType The type of the event to send. 14883 * 14884 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 14885 */ 14886 public void sendAccessibilityEvent(View host, int eventType) { 14887 host.sendAccessibilityEventInternal(eventType); 14888 } 14889 14890 /** 14891 * Sends an accessibility event. This method behaves exactly as 14892 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 14893 * empty {@link AccessibilityEvent} and does not perform a check whether 14894 * accessibility is enabled. 14895 * <p> 14896 * The default implementation behaves as 14897 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 14898 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 14899 * the case of no accessibility delegate been set. 14900 * </p> 14901 * 14902 * @param host The View hosting the delegate. 14903 * @param event The event to send. 14904 * 14905 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 14906 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 14907 */ 14908 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 14909 host.sendAccessibilityEventUncheckedInternal(event); 14910 } 14911 14912 /** 14913 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 14914 * to its children for adding their text content to the event. 14915 * <p> 14916 * The default implementation behaves as 14917 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 14918 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 14919 * the case of no accessibility delegate been set. 14920 * </p> 14921 * 14922 * @param host The View hosting the delegate. 14923 * @param event The event. 14924 * @return True if the event population was completed. 14925 * 14926 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 14927 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 14928 */ 14929 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 14930 return host.dispatchPopulateAccessibilityEventInternal(event); 14931 } 14932 14933 /** 14934 * Gives a chance to the host View to populate the accessibility event with its 14935 * text content. 14936 * <p> 14937 * The default implementation behaves as 14938 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 14939 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 14940 * the case of no accessibility delegate been set. 14941 * </p> 14942 * 14943 * @param host The View hosting the delegate. 14944 * @param event The accessibility event which to populate. 14945 * 14946 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 14947 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 14948 */ 14949 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 14950 host.onPopulateAccessibilityEventInternal(event); 14951 } 14952 14953 /** 14954 * Initializes an {@link AccessibilityEvent} with information about the 14955 * the host View which is the event source. 14956 * <p> 14957 * The default implementation behaves as 14958 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 14959 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 14960 * the case of no accessibility delegate been set. 14961 * </p> 14962 * 14963 * @param host The View hosting the delegate. 14964 * @param event The event to initialize. 14965 * 14966 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 14967 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 14968 */ 14969 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 14970 host.onInitializeAccessibilityEventInternal(event); 14971 } 14972 14973 /** 14974 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 14975 * <p> 14976 * The default implementation behaves as 14977 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 14978 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 14979 * the case of no accessibility delegate been set. 14980 * </p> 14981 * 14982 * @param host The View hosting the delegate. 14983 * @param info The instance to initialize. 14984 * 14985 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 14986 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 14987 */ 14988 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 14989 host.onInitializeAccessibilityNodeInfoInternal(info); 14990 } 14991 14992 /** 14993 * Called when a child of the host View has requested sending an 14994 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 14995 * to augment the event. 14996 * <p> 14997 * The default implementation behaves as 14998 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 14999 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 15000 * the case of no accessibility delegate been set. 15001 * </p> 15002 * 15003 * @param host The View hosting the delegate. 15004 * @param child The child which requests sending the event. 15005 * @param event The event to be sent. 15006 * @return True if the event should be sent 15007 * 15008 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15009 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15010 */ 15011 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 15012 AccessibilityEvent event) { 15013 return host.onRequestSendAccessibilityEventInternal(child, event); 15014 } 15015 15016 /** 15017 * Gets the provider for managing a virtual view hierarchy rooted at this View 15018 * and reported to {@link android.accessibilityservice.AccessibilityService}s 15019 * that explore the window content. 15020 * <p> 15021 * The default implementation behaves as 15022 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 15023 * the case of no accessibility delegate been set. 15024 * </p> 15025 * 15026 * @return The provider. 15027 * 15028 * @see AccessibilityNodeProvider 15029 */ 15030 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 15031 return null; 15032 } 15033 } 15034} 15035