View.java revision b934db7e3e6d4c3963d2a4a5c00cfb0c3ffbfce4
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.Parcel; 44import android.os.Parcelable; 45import android.os.RemoteException; 46import android.os.SystemClock; 47import android.text.TextUtils; 48import android.util.AttributeSet; 49import android.util.FloatProperty; 50import android.util.LocaleUtil; 51import android.util.Log; 52import android.util.Pool; 53import android.util.Poolable; 54import android.util.PoolableManager; 55import android.util.Pools; 56import android.util.Property; 57import android.util.SparseArray; 58import android.util.TypedValue; 59import android.view.ContextMenu.ContextMenuInfo; 60import android.view.accessibility.AccessibilityEvent; 61import android.view.accessibility.AccessibilityEventSource; 62import android.view.accessibility.AccessibilityManager; 63import android.view.accessibility.AccessibilityNodeInfo; 64import android.view.accessibility.AccessibilityNodeProvider; 65import android.view.animation.Animation; 66import android.view.animation.AnimationUtils; 67import android.view.animation.Transformation; 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_paddingStart 604 * @attr ref android.R.styleable#View_paddingEnd 605 * @attr ref android.R.styleable#View_saveEnabled 606 * @attr ref android.R.styleable#View_rotation 607 * @attr ref android.R.styleable#View_rotationX 608 * @attr ref android.R.styleable#View_rotationY 609 * @attr ref android.R.styleable#View_scaleX 610 * @attr ref android.R.styleable#View_scaleY 611 * @attr ref android.R.styleable#View_scrollX 612 * @attr ref android.R.styleable#View_scrollY 613 * @attr ref android.R.styleable#View_scrollbarSize 614 * @attr ref android.R.styleable#View_scrollbarStyle 615 * @attr ref android.R.styleable#View_scrollbars 616 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 617 * @attr ref android.R.styleable#View_scrollbarFadeDuration 618 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 619 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbVertical 621 * @attr ref android.R.styleable#View_scrollbarTrackVertical 622 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 624 * @attr ref android.R.styleable#View_soundEffectsEnabled 625 * @attr ref android.R.styleable#View_tag 626 * @attr ref android.R.styleable#View_transformPivotX 627 * @attr ref android.R.styleable#View_transformPivotY 628 * @attr ref android.R.styleable#View_translationX 629 * @attr ref android.R.styleable#View_translationY 630 * @attr ref android.R.styleable#View_visibility 631 * 632 * @see android.view.ViewGroup 633 */ 634public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 635 AccessibilityEventSource { 636 private static final boolean DBG = false; 637 638 /** 639 * The logging tag used by this class with android.util.Log. 640 */ 641 protected static final String VIEW_LOG_TAG = "View"; 642 643 /** 644 * Used to mark a View that has no ID. 645 */ 646 public static final int NO_ID = -1; 647 648 /** 649 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 650 * calling setFlags. 651 */ 652 private static final int NOT_FOCUSABLE = 0x00000000; 653 654 /** 655 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 656 * setFlags. 657 */ 658 private static final int FOCUSABLE = 0x00000001; 659 660 /** 661 * Mask for use with setFlags indicating bits used for focus. 662 */ 663 private static final int FOCUSABLE_MASK = 0x00000001; 664 665 /** 666 * This view will adjust its padding to fit sytem windows (e.g. status bar) 667 */ 668 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 669 670 /** 671 * This view is visible. 672 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 673 * android:visibility}. 674 */ 675 public static final int VISIBLE = 0x00000000; 676 677 /** 678 * This view is invisible, but it still takes up space for layout purposes. 679 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 680 * android:visibility}. 681 */ 682 public static final int INVISIBLE = 0x00000004; 683 684 /** 685 * This view is invisible, and it doesn't take any space for layout 686 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 687 * android:visibility}. 688 */ 689 public static final int GONE = 0x00000008; 690 691 /** 692 * Mask for use with setFlags indicating bits used for visibility. 693 * {@hide} 694 */ 695 static final int VISIBILITY_MASK = 0x0000000C; 696 697 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 698 699 /** 700 * This view is enabled. Interpretation varies by subclass. 701 * Use with ENABLED_MASK when calling setFlags. 702 * {@hide} 703 */ 704 static final int ENABLED = 0x00000000; 705 706 /** 707 * This view is disabled. Interpretation varies by subclass. 708 * Use with ENABLED_MASK when calling setFlags. 709 * {@hide} 710 */ 711 static final int DISABLED = 0x00000020; 712 713 /** 714 * Mask for use with setFlags indicating bits used for indicating whether 715 * this view is enabled 716 * {@hide} 717 */ 718 static final int ENABLED_MASK = 0x00000020; 719 720 /** 721 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 722 * called and further optimizations will be performed. It is okay to have 723 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 724 * {@hide} 725 */ 726 static final int WILL_NOT_DRAW = 0x00000080; 727 728 /** 729 * Mask for use with setFlags indicating bits used for indicating whether 730 * this view is will draw 731 * {@hide} 732 */ 733 static final int DRAW_MASK = 0x00000080; 734 735 /** 736 * <p>This view doesn't show scrollbars.</p> 737 * {@hide} 738 */ 739 static final int SCROLLBARS_NONE = 0x00000000; 740 741 /** 742 * <p>This view shows horizontal scrollbars.</p> 743 * {@hide} 744 */ 745 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 746 747 /** 748 * <p>This view shows vertical scrollbars.</p> 749 * {@hide} 750 */ 751 static final int SCROLLBARS_VERTICAL = 0x00000200; 752 753 /** 754 * <p>Mask for use with setFlags indicating bits used for indicating which 755 * scrollbars are enabled.</p> 756 * {@hide} 757 */ 758 static final int SCROLLBARS_MASK = 0x00000300; 759 760 /** 761 * Indicates that the view should filter touches when its window is obscured. 762 * Refer to the class comments for more information about this security feature. 763 * {@hide} 764 */ 765 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 766 767 // note flag value 0x00000800 is now available for next flags... 768 769 /** 770 * <p>This view doesn't show fading edges.</p> 771 * {@hide} 772 */ 773 static final int FADING_EDGE_NONE = 0x00000000; 774 775 /** 776 * <p>This view shows horizontal fading edges.</p> 777 * {@hide} 778 */ 779 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 780 781 /** 782 * <p>This view shows vertical fading edges.</p> 783 * {@hide} 784 */ 785 static final int FADING_EDGE_VERTICAL = 0x00002000; 786 787 /** 788 * <p>Mask for use with setFlags indicating bits used for indicating which 789 * fading edges are enabled.</p> 790 * {@hide} 791 */ 792 static final int FADING_EDGE_MASK = 0x00003000; 793 794 /** 795 * <p>Indicates this view can be clicked. When clickable, a View reacts 796 * to clicks by notifying the OnClickListener.<p> 797 * {@hide} 798 */ 799 static final int CLICKABLE = 0x00004000; 800 801 /** 802 * <p>Indicates this view is caching its drawing into a bitmap.</p> 803 * {@hide} 804 */ 805 static final int DRAWING_CACHE_ENABLED = 0x00008000; 806 807 /** 808 * <p>Indicates that no icicle should be saved for this view.<p> 809 * {@hide} 810 */ 811 static final int SAVE_DISABLED = 0x000010000; 812 813 /** 814 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 815 * property.</p> 816 * {@hide} 817 */ 818 static final int SAVE_DISABLED_MASK = 0x000010000; 819 820 /** 821 * <p>Indicates that no drawing cache should ever be created for this view.<p> 822 * {@hide} 823 */ 824 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 825 826 /** 827 * <p>Indicates this view can take / keep focus when int touch mode.</p> 828 * {@hide} 829 */ 830 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 831 832 /** 833 * <p>Enables low quality mode for the drawing cache.</p> 834 */ 835 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 836 837 /** 838 * <p>Enables high quality mode for the drawing cache.</p> 839 */ 840 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 841 842 /** 843 * <p>Enables automatic quality mode for the drawing cache.</p> 844 */ 845 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 846 847 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 848 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 849 }; 850 851 /** 852 * <p>Mask for use with setFlags indicating bits used for the cache 853 * quality property.</p> 854 * {@hide} 855 */ 856 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 857 858 /** 859 * <p> 860 * Indicates this view can be long clicked. When long clickable, a View 861 * reacts to long clicks by notifying the OnLongClickListener or showing a 862 * context menu. 863 * </p> 864 * {@hide} 865 */ 866 static final int LONG_CLICKABLE = 0x00200000; 867 868 /** 869 * <p>Indicates that this view gets its drawable states from its direct parent 870 * and ignores its original internal states.</p> 871 * 872 * @hide 873 */ 874 static final int DUPLICATE_PARENT_STATE = 0x00400000; 875 876 /** 877 * The scrollbar style to display the scrollbars inside the content area, 878 * without increasing the padding. The scrollbars will be overlaid with 879 * translucency on the view's content. 880 */ 881 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 882 883 /** 884 * The scrollbar style to display the scrollbars inside the padded area, 885 * increasing the padding of the view. The scrollbars will not overlap the 886 * content area of the view. 887 */ 888 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 889 890 /** 891 * The scrollbar style to display the scrollbars at the edge of the view, 892 * without increasing the padding. The scrollbars will be overlaid with 893 * translucency. 894 */ 895 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 896 897 /** 898 * The scrollbar style to display the scrollbars at the edge of the view, 899 * increasing the padding of the view. The scrollbars will only overlap the 900 * background, if any. 901 */ 902 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 903 904 /** 905 * Mask to check if the scrollbar style is overlay or inset. 906 * {@hide} 907 */ 908 static final int SCROLLBARS_INSET_MASK = 0x01000000; 909 910 /** 911 * Mask to check if the scrollbar style is inside or outside. 912 * {@hide} 913 */ 914 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 915 916 /** 917 * Mask for scrollbar style. 918 * {@hide} 919 */ 920 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 921 922 /** 923 * View flag indicating that the screen should remain on while the 924 * window containing this view is visible to the user. This effectively 925 * takes care of automatically setting the WindowManager's 926 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 927 */ 928 public static final int KEEP_SCREEN_ON = 0x04000000; 929 930 /** 931 * View flag indicating whether this view should have sound effects enabled 932 * for events such as clicking and touching. 933 */ 934 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 935 936 /** 937 * View flag indicating whether this view should have haptic feedback 938 * enabled for events such as long presses. 939 */ 940 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 941 942 /** 943 * <p>Indicates that the view hierarchy should stop saving state when 944 * it reaches this view. If state saving is initiated immediately at 945 * the view, it will be allowed. 946 * {@hide} 947 */ 948 static final int PARENT_SAVE_DISABLED = 0x20000000; 949 950 /** 951 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 952 * {@hide} 953 */ 954 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 955 956 /** 957 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 958 * should add all focusable Views regardless if they are focusable in touch mode. 959 */ 960 public static final int FOCUSABLES_ALL = 0x00000000; 961 962 /** 963 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 964 * should add only Views focusable in touch mode. 965 */ 966 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 967 968 /** 969 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 970 * item. 971 */ 972 public static final int FOCUS_BACKWARD = 0x00000001; 973 974 /** 975 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 976 * item. 977 */ 978 public static final int FOCUS_FORWARD = 0x00000002; 979 980 /** 981 * Use with {@link #focusSearch(int)}. Move focus to the left. 982 */ 983 public static final int FOCUS_LEFT = 0x00000011; 984 985 /** 986 * Use with {@link #focusSearch(int)}. Move focus up. 987 */ 988 public static final int FOCUS_UP = 0x00000021; 989 990 /** 991 * Use with {@link #focusSearch(int)}. Move focus to the right. 992 */ 993 public static final int FOCUS_RIGHT = 0x00000042; 994 995 /** 996 * Use with {@link #focusSearch(int)}. Move focus down. 997 */ 998 public static final int FOCUS_DOWN = 0x00000082; 999 1000 /** 1001 * Bits of {@link #getMeasuredWidthAndState()} and 1002 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1003 */ 1004 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1005 1006 /** 1007 * Bits of {@link #getMeasuredWidthAndState()} and 1008 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1009 */ 1010 public static final int MEASURED_STATE_MASK = 0xff000000; 1011 1012 /** 1013 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1014 * for functions that combine both width and height into a single int, 1015 * such as {@link #getMeasuredState()} and the childState argument of 1016 * {@link #resolveSizeAndState(int, int, int)}. 1017 */ 1018 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1019 1020 /** 1021 * Bit of {@link #getMeasuredWidthAndState()} and 1022 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1023 * is smaller that the space the view would like to have. 1024 */ 1025 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1026 1027 /** 1028 * Base View state sets 1029 */ 1030 // Singles 1031 /** 1032 * Indicates the view has no states set. States are used with 1033 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1034 * view depending on its state. 1035 * 1036 * @see android.graphics.drawable.Drawable 1037 * @see #getDrawableState() 1038 */ 1039 protected static final int[] EMPTY_STATE_SET; 1040 /** 1041 * Indicates the view is enabled. States are used with 1042 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1043 * view depending on its state. 1044 * 1045 * @see android.graphics.drawable.Drawable 1046 * @see #getDrawableState() 1047 */ 1048 protected static final int[] ENABLED_STATE_SET; 1049 /** 1050 * Indicates the view is focused. States are used with 1051 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1052 * view depending on its state. 1053 * 1054 * @see android.graphics.drawable.Drawable 1055 * @see #getDrawableState() 1056 */ 1057 protected static final int[] FOCUSED_STATE_SET; 1058 /** 1059 * Indicates the view is selected. States are used with 1060 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1061 * view depending on its state. 1062 * 1063 * @see android.graphics.drawable.Drawable 1064 * @see #getDrawableState() 1065 */ 1066 protected static final int[] SELECTED_STATE_SET; 1067 /** 1068 * Indicates the view is pressed. States are used with 1069 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1070 * view depending on its state. 1071 * 1072 * @see android.graphics.drawable.Drawable 1073 * @see #getDrawableState() 1074 * @hide 1075 */ 1076 protected static final int[] PRESSED_STATE_SET; 1077 /** 1078 * Indicates the view's window has focus. 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[] WINDOW_FOCUSED_STATE_SET; 1086 // Doubles 1087 /** 1088 * Indicates the view is enabled and has the focus. 1089 * 1090 * @see #ENABLED_STATE_SET 1091 * @see #FOCUSED_STATE_SET 1092 */ 1093 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1094 /** 1095 * Indicates the view is enabled and selected. 1096 * 1097 * @see #ENABLED_STATE_SET 1098 * @see #SELECTED_STATE_SET 1099 */ 1100 protected static final int[] ENABLED_SELECTED_STATE_SET; 1101 /** 1102 * Indicates the view is enabled and that its window has focus. 1103 * 1104 * @see #ENABLED_STATE_SET 1105 * @see #WINDOW_FOCUSED_STATE_SET 1106 */ 1107 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1108 /** 1109 * Indicates the view is focused and selected. 1110 * 1111 * @see #FOCUSED_STATE_SET 1112 * @see #SELECTED_STATE_SET 1113 */ 1114 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1115 /** 1116 * Indicates the view has the focus and that its window has the focus. 1117 * 1118 * @see #FOCUSED_STATE_SET 1119 * @see #WINDOW_FOCUSED_STATE_SET 1120 */ 1121 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1122 /** 1123 * Indicates the view is selected and that its window has the focus. 1124 * 1125 * @see #SELECTED_STATE_SET 1126 * @see #WINDOW_FOCUSED_STATE_SET 1127 */ 1128 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1129 // Triples 1130 /** 1131 * Indicates the view is enabled, focused and selected. 1132 * 1133 * @see #ENABLED_STATE_SET 1134 * @see #FOCUSED_STATE_SET 1135 * @see #SELECTED_STATE_SET 1136 */ 1137 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1138 /** 1139 * Indicates the view is enabled, focused and its window has the focus. 1140 * 1141 * @see #ENABLED_STATE_SET 1142 * @see #FOCUSED_STATE_SET 1143 * @see #WINDOW_FOCUSED_STATE_SET 1144 */ 1145 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1146 /** 1147 * Indicates the view is enabled, selected and its window has the focus. 1148 * 1149 * @see #ENABLED_STATE_SET 1150 * @see #SELECTED_STATE_SET 1151 * @see #WINDOW_FOCUSED_STATE_SET 1152 */ 1153 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1154 /** 1155 * Indicates the view is focused, selected and its window has the focus. 1156 * 1157 * @see #FOCUSED_STATE_SET 1158 * @see #SELECTED_STATE_SET 1159 * @see #WINDOW_FOCUSED_STATE_SET 1160 */ 1161 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1162 /** 1163 * Indicates the view is enabled, focused, selected and its window 1164 * has the focus. 1165 * 1166 * @see #ENABLED_STATE_SET 1167 * @see #FOCUSED_STATE_SET 1168 * @see #SELECTED_STATE_SET 1169 * @see #WINDOW_FOCUSED_STATE_SET 1170 */ 1171 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1172 /** 1173 * Indicates the view is pressed and its window has the focus. 1174 * 1175 * @see #PRESSED_STATE_SET 1176 * @see #WINDOW_FOCUSED_STATE_SET 1177 */ 1178 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1179 /** 1180 * Indicates the view is pressed and selected. 1181 * 1182 * @see #PRESSED_STATE_SET 1183 * @see #SELECTED_STATE_SET 1184 */ 1185 protected static final int[] PRESSED_SELECTED_STATE_SET; 1186 /** 1187 * Indicates the view is pressed, selected and its window has the focus. 1188 * 1189 * @see #PRESSED_STATE_SET 1190 * @see #SELECTED_STATE_SET 1191 * @see #WINDOW_FOCUSED_STATE_SET 1192 */ 1193 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1194 /** 1195 * Indicates the view is pressed and focused. 1196 * 1197 * @see #PRESSED_STATE_SET 1198 * @see #FOCUSED_STATE_SET 1199 */ 1200 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1201 /** 1202 * Indicates the view is pressed, focused and its window has the focus. 1203 * 1204 * @see #PRESSED_STATE_SET 1205 * @see #FOCUSED_STATE_SET 1206 * @see #WINDOW_FOCUSED_STATE_SET 1207 */ 1208 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1209 /** 1210 * Indicates the view is pressed, focused and selected. 1211 * 1212 * @see #PRESSED_STATE_SET 1213 * @see #SELECTED_STATE_SET 1214 * @see #FOCUSED_STATE_SET 1215 */ 1216 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1217 /** 1218 * Indicates the view is pressed, focused, selected and its window has the focus. 1219 * 1220 * @see #PRESSED_STATE_SET 1221 * @see #FOCUSED_STATE_SET 1222 * @see #SELECTED_STATE_SET 1223 * @see #WINDOW_FOCUSED_STATE_SET 1224 */ 1225 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1226 /** 1227 * Indicates the view is pressed and enabled. 1228 * 1229 * @see #PRESSED_STATE_SET 1230 * @see #ENABLED_STATE_SET 1231 */ 1232 protected static final int[] PRESSED_ENABLED_STATE_SET; 1233 /** 1234 * Indicates the view is pressed, enabled and its window has the focus. 1235 * 1236 * @see #PRESSED_STATE_SET 1237 * @see #ENABLED_STATE_SET 1238 * @see #WINDOW_FOCUSED_STATE_SET 1239 */ 1240 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1241 /** 1242 * Indicates the view is pressed, enabled and selected. 1243 * 1244 * @see #PRESSED_STATE_SET 1245 * @see #ENABLED_STATE_SET 1246 * @see #SELECTED_STATE_SET 1247 */ 1248 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1249 /** 1250 * Indicates the view is pressed, enabled, selected and its window has the 1251 * focus. 1252 * 1253 * @see #PRESSED_STATE_SET 1254 * @see #ENABLED_STATE_SET 1255 * @see #SELECTED_STATE_SET 1256 * @see #WINDOW_FOCUSED_STATE_SET 1257 */ 1258 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1259 /** 1260 * Indicates the view is pressed, enabled and focused. 1261 * 1262 * @see #PRESSED_STATE_SET 1263 * @see #ENABLED_STATE_SET 1264 * @see #FOCUSED_STATE_SET 1265 */ 1266 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1267 /** 1268 * Indicates the view is pressed, enabled, focused and its window has the 1269 * focus. 1270 * 1271 * @see #PRESSED_STATE_SET 1272 * @see #ENABLED_STATE_SET 1273 * @see #FOCUSED_STATE_SET 1274 * @see #WINDOW_FOCUSED_STATE_SET 1275 */ 1276 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1277 /** 1278 * Indicates the view is pressed, enabled, focused and selected. 1279 * 1280 * @see #PRESSED_STATE_SET 1281 * @see #ENABLED_STATE_SET 1282 * @see #SELECTED_STATE_SET 1283 * @see #FOCUSED_STATE_SET 1284 */ 1285 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1286 /** 1287 * Indicates the view is pressed, enabled, focused, selected and its window 1288 * has the focus. 1289 * 1290 * @see #PRESSED_STATE_SET 1291 * @see #ENABLED_STATE_SET 1292 * @see #SELECTED_STATE_SET 1293 * @see #FOCUSED_STATE_SET 1294 * @see #WINDOW_FOCUSED_STATE_SET 1295 */ 1296 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1297 1298 /** 1299 * The order here is very important to {@link #getDrawableState()} 1300 */ 1301 private static final int[][] VIEW_STATE_SETS; 1302 1303 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1304 static final int VIEW_STATE_SELECTED = 1 << 1; 1305 static final int VIEW_STATE_FOCUSED = 1 << 2; 1306 static final int VIEW_STATE_ENABLED = 1 << 3; 1307 static final int VIEW_STATE_PRESSED = 1 << 4; 1308 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1309 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1310 static final int VIEW_STATE_HOVERED = 1 << 7; 1311 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1312 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1313 1314 static final int[] VIEW_STATE_IDS = new int[] { 1315 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1316 R.attr.state_selected, VIEW_STATE_SELECTED, 1317 R.attr.state_focused, VIEW_STATE_FOCUSED, 1318 R.attr.state_enabled, VIEW_STATE_ENABLED, 1319 R.attr.state_pressed, VIEW_STATE_PRESSED, 1320 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1321 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1322 R.attr.state_hovered, VIEW_STATE_HOVERED, 1323 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1324 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1325 }; 1326 1327 static { 1328 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1329 throw new IllegalStateException( 1330 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1331 } 1332 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1333 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1334 int viewState = R.styleable.ViewDrawableStates[i]; 1335 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1336 if (VIEW_STATE_IDS[j] == viewState) { 1337 orderedIds[i * 2] = viewState; 1338 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1339 } 1340 } 1341 } 1342 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1343 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1344 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1345 int numBits = Integer.bitCount(i); 1346 int[] set = new int[numBits]; 1347 int pos = 0; 1348 for (int j = 0; j < orderedIds.length; j += 2) { 1349 if ((i & orderedIds[j+1]) != 0) { 1350 set[pos++] = orderedIds[j]; 1351 } 1352 } 1353 VIEW_STATE_SETS[i] = set; 1354 } 1355 1356 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1357 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1358 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1359 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1360 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1361 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1362 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1363 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1364 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1365 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1366 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1367 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1368 | VIEW_STATE_FOCUSED]; 1369 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1370 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1371 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1372 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1373 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1374 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1375 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1376 | VIEW_STATE_ENABLED]; 1377 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1378 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1379 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1380 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1381 | VIEW_STATE_ENABLED]; 1382 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1383 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1384 | VIEW_STATE_ENABLED]; 1385 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1386 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1387 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1388 1389 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1390 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1391 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1392 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1393 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1394 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1395 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1396 | VIEW_STATE_PRESSED]; 1397 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1398 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1399 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1400 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1401 | VIEW_STATE_PRESSED]; 1402 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1403 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1404 | VIEW_STATE_PRESSED]; 1405 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1406 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1407 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1408 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1409 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1410 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1412 | VIEW_STATE_PRESSED]; 1413 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1415 | VIEW_STATE_PRESSED]; 1416 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1418 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1419 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1420 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1421 | VIEW_STATE_PRESSED]; 1422 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1423 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1424 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1425 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1426 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1427 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1428 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1429 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1430 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1431 | VIEW_STATE_PRESSED]; 1432 } 1433 1434 /** 1435 * Accessibility event types that are dispatched for text population. 1436 */ 1437 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1438 AccessibilityEvent.TYPE_VIEW_CLICKED 1439 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1440 | AccessibilityEvent.TYPE_VIEW_SELECTED 1441 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1442 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1443 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1444 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1445 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1446 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED; 1447 1448 /** 1449 * Temporary Rect currently for use in setBackground(). This will probably 1450 * be extended in the future to hold our own class with more than just 1451 * a Rect. :) 1452 */ 1453 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1454 1455 /** 1456 * Map used to store views' tags. 1457 */ 1458 private SparseArray<Object> mKeyedTags; 1459 1460 /** 1461 * The next available accessiiblity id. 1462 */ 1463 private static int sNextAccessibilityViewId; 1464 1465 /** 1466 * The animation currently associated with this view. 1467 * @hide 1468 */ 1469 protected Animation mCurrentAnimation = null; 1470 1471 /** 1472 * Width as measured during measure pass. 1473 * {@hide} 1474 */ 1475 @ViewDebug.ExportedProperty(category = "measurement") 1476 int mMeasuredWidth; 1477 1478 /** 1479 * Height as measured during measure pass. 1480 * {@hide} 1481 */ 1482 @ViewDebug.ExportedProperty(category = "measurement") 1483 int mMeasuredHeight; 1484 1485 /** 1486 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1487 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1488 * its display list. This flag, used only when hw accelerated, allows us to clear the 1489 * flag while retaining this information until it's needed (at getDisplayList() time and 1490 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1491 * 1492 * {@hide} 1493 */ 1494 boolean mRecreateDisplayList = false; 1495 1496 /** 1497 * The view's identifier. 1498 * {@hide} 1499 * 1500 * @see #setId(int) 1501 * @see #getId() 1502 */ 1503 @ViewDebug.ExportedProperty(resolveId = true) 1504 int mID = NO_ID; 1505 1506 /** 1507 * The stable ID of this view for accessibility purposes. 1508 */ 1509 int mAccessibilityViewId = NO_ID; 1510 1511 /** 1512 * The view's tag. 1513 * {@hide} 1514 * 1515 * @see #setTag(Object) 1516 * @see #getTag() 1517 */ 1518 protected Object mTag; 1519 1520 // for mPrivateFlags: 1521 /** {@hide} */ 1522 static final int WANTS_FOCUS = 0x00000001; 1523 /** {@hide} */ 1524 static final int FOCUSED = 0x00000002; 1525 /** {@hide} */ 1526 static final int SELECTED = 0x00000004; 1527 /** {@hide} */ 1528 static final int IS_ROOT_NAMESPACE = 0x00000008; 1529 /** {@hide} */ 1530 static final int HAS_BOUNDS = 0x00000010; 1531 /** {@hide} */ 1532 static final int DRAWN = 0x00000020; 1533 /** 1534 * When this flag is set, this view is running an animation on behalf of its 1535 * children and should therefore not cancel invalidate requests, even if they 1536 * lie outside of this view's bounds. 1537 * 1538 * {@hide} 1539 */ 1540 static final int DRAW_ANIMATION = 0x00000040; 1541 /** {@hide} */ 1542 static final int SKIP_DRAW = 0x00000080; 1543 /** {@hide} */ 1544 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1545 /** {@hide} */ 1546 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1547 /** {@hide} */ 1548 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1549 /** {@hide} */ 1550 static final int MEASURED_DIMENSION_SET = 0x00000800; 1551 /** {@hide} */ 1552 static final int FORCE_LAYOUT = 0x00001000; 1553 /** {@hide} */ 1554 static final int LAYOUT_REQUIRED = 0x00002000; 1555 1556 private static final int PRESSED = 0x00004000; 1557 1558 /** {@hide} */ 1559 static final int DRAWING_CACHE_VALID = 0x00008000; 1560 /** 1561 * Flag used to indicate that this view should be drawn once more (and only once 1562 * more) after its animation has completed. 1563 * {@hide} 1564 */ 1565 static final int ANIMATION_STARTED = 0x00010000; 1566 1567 private static final int SAVE_STATE_CALLED = 0x00020000; 1568 1569 /** 1570 * Indicates that the View returned true when onSetAlpha() was called and that 1571 * the alpha must be restored. 1572 * {@hide} 1573 */ 1574 static final int ALPHA_SET = 0x00040000; 1575 1576 /** 1577 * Set by {@link #setScrollContainer(boolean)}. 1578 */ 1579 static final int SCROLL_CONTAINER = 0x00080000; 1580 1581 /** 1582 * Set by {@link #setScrollContainer(boolean)}. 1583 */ 1584 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1585 1586 /** 1587 * View flag indicating whether this view was invalidated (fully or partially.) 1588 * 1589 * @hide 1590 */ 1591 static final int DIRTY = 0x00200000; 1592 1593 /** 1594 * View flag indicating whether this view was invalidated by an opaque 1595 * invalidate request. 1596 * 1597 * @hide 1598 */ 1599 static final int DIRTY_OPAQUE = 0x00400000; 1600 1601 /** 1602 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1603 * 1604 * @hide 1605 */ 1606 static final int DIRTY_MASK = 0x00600000; 1607 1608 /** 1609 * Indicates whether the background is opaque. 1610 * 1611 * @hide 1612 */ 1613 static final int OPAQUE_BACKGROUND = 0x00800000; 1614 1615 /** 1616 * Indicates whether the scrollbars are opaque. 1617 * 1618 * @hide 1619 */ 1620 static final int OPAQUE_SCROLLBARS = 0x01000000; 1621 1622 /** 1623 * Indicates whether the view is opaque. 1624 * 1625 * @hide 1626 */ 1627 static final int OPAQUE_MASK = 0x01800000; 1628 1629 /** 1630 * Indicates a prepressed state; 1631 * the short time between ACTION_DOWN and recognizing 1632 * a 'real' press. Prepressed is used to recognize quick taps 1633 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1634 * 1635 * @hide 1636 */ 1637 private static final int PREPRESSED = 0x02000000; 1638 1639 /** 1640 * Indicates whether the view is temporarily detached. 1641 * 1642 * @hide 1643 */ 1644 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1645 1646 /** 1647 * Indicates that we should awaken scroll bars once attached 1648 * 1649 * @hide 1650 */ 1651 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1652 1653 /** 1654 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1655 * @hide 1656 */ 1657 private static final int HOVERED = 0x10000000; 1658 1659 /** 1660 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1661 * for transform operations 1662 * 1663 * @hide 1664 */ 1665 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1666 1667 /** {@hide} */ 1668 static final int ACTIVATED = 0x40000000; 1669 1670 /** 1671 * Indicates that this view was specifically invalidated, not just dirtied because some 1672 * child view was invalidated. The flag is used to determine when we need to recreate 1673 * a view's display list (as opposed to just returning a reference to its existing 1674 * display list). 1675 * 1676 * @hide 1677 */ 1678 static final int INVALIDATED = 0x80000000; 1679 1680 /* Masks for mPrivateFlags2 */ 1681 1682 /** 1683 * Indicates that this view has reported that it can accept the current drag's content. 1684 * Cleared when the drag operation concludes. 1685 * @hide 1686 */ 1687 static final int DRAG_CAN_ACCEPT = 0x00000001; 1688 1689 /** 1690 * Indicates that this view is currently directly under the drag location in a 1691 * drag-and-drop operation involving content that it can accept. Cleared when 1692 * the drag exits the view, or when the drag operation concludes. 1693 * @hide 1694 */ 1695 static final int DRAG_HOVERED = 0x00000002; 1696 1697 /** 1698 * Horizontal layout direction of this view is from Left to Right. 1699 * Use with {@link #setLayoutDirection}. 1700 */ 1701 public static final int LAYOUT_DIRECTION_LTR = 0; 1702 1703 /** 1704 * Horizontal layout direction of this view is from Right to Left. 1705 * Use with {@link #setLayoutDirection}. 1706 */ 1707 public static final int LAYOUT_DIRECTION_RTL = 1; 1708 1709 /** 1710 * Horizontal layout direction of this view is inherited from its parent. 1711 * Use with {@link #setLayoutDirection}. 1712 */ 1713 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1714 1715 /** 1716 * Horizontal layout direction of this view is from deduced from the default language 1717 * script for the locale. Use with {@link #setLayoutDirection}. 1718 */ 1719 public static final int LAYOUT_DIRECTION_LOCALE = 3; 1720 1721 /** 1722 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1723 * @hide 1724 */ 1725 static final int LAYOUT_DIRECTION_MASK_SHIFT = 2; 1726 1727 /** 1728 * Mask for use with private flags indicating bits used for horizontal layout direction. 1729 * @hide 1730 */ 1731 static final int LAYOUT_DIRECTION_MASK = 0x00000003 << LAYOUT_DIRECTION_MASK_SHIFT; 1732 1733 /** 1734 * Indicates whether the view horizontal layout direction has been resolved and drawn to the 1735 * right-to-left direction. 1736 * @hide 1737 */ 1738 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 4 << LAYOUT_DIRECTION_MASK_SHIFT; 1739 1740 /** 1741 * Indicates whether the view horizontal layout direction has been resolved. 1742 * @hide 1743 */ 1744 static final int LAYOUT_DIRECTION_RESOLVED = 8 << LAYOUT_DIRECTION_MASK_SHIFT; 1745 1746 /** 1747 * Mask for use with private flags indicating bits used for resolved horizontal layout direction. 1748 * @hide 1749 */ 1750 static final int LAYOUT_DIRECTION_RESOLVED_MASK = 0x0000000C << LAYOUT_DIRECTION_MASK_SHIFT; 1751 1752 /* 1753 * Array of horizontal layout direction flags for mapping attribute "layoutDirection" to correct 1754 * flag value. 1755 * @hide 1756 */ 1757 private static final int[] LAYOUT_DIRECTION_FLAGS = { 1758 LAYOUT_DIRECTION_LTR, 1759 LAYOUT_DIRECTION_RTL, 1760 LAYOUT_DIRECTION_INHERIT, 1761 LAYOUT_DIRECTION_LOCALE 1762 }; 1763 1764 /** 1765 * Default horizontal layout direction. 1766 * @hide 1767 */ 1768 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1769 1770 1771 /** 1772 * Indicates that the view is tracking some sort of transient state 1773 * that the app should not need to be aware of, but that the framework 1774 * should take special care to preserve. 1775 * 1776 * @hide 1777 */ 1778 static final int HAS_TRANSIENT_STATE = 0x00000100; 1779 1780 1781 /** 1782 * Text direction is inherited thru {@link ViewGroup} 1783 */ 1784 public static final int TEXT_DIRECTION_INHERIT = 0; 1785 1786 /** 1787 * Text direction is using "first strong algorithm". The first strong directional character 1788 * determines the paragraph direction. If there is no strong directional character, the 1789 * paragraph direction is the view's resolved layout direction. 1790 */ 1791 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1792 1793 /** 1794 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1795 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1796 * If there are neither, the paragraph direction is the view's resolved layout direction. 1797 */ 1798 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1799 1800 /** 1801 * Text direction is forced to LTR. 1802 */ 1803 public static final int TEXT_DIRECTION_LTR = 3; 1804 1805 /** 1806 * Text direction is forced to RTL. 1807 */ 1808 public static final int TEXT_DIRECTION_RTL = 4; 1809 1810 /** 1811 * Text direction is coming from the system Locale. 1812 */ 1813 public static final int TEXT_DIRECTION_LOCALE = 5; 1814 1815 /** 1816 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1817 * @hide 1818 */ 1819 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1820 1821 /** 1822 * Default text direction is inherited 1823 */ 1824 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1825 1826 /** 1827 * Mask for use with private flags indicating bits used for text direction. 1828 * @hide 1829 */ 1830 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1831 1832 /** 1833 * Array of text direction flags for mapping attribute "textDirection" to correct 1834 * flag value. 1835 * @hide 1836 */ 1837 private static final int[] TEXT_DIRECTION_FLAGS = { 1838 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1839 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1840 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1841 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1842 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1843 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1844 }; 1845 1846 /** 1847 * Indicates whether the view text direction has been resolved. 1848 * @hide 1849 */ 1850 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1851 1852 /** 1853 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1854 * @hide 1855 */ 1856 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1857 1858 /** 1859 * Mask for use with private flags indicating bits used for resolved text direction. 1860 * @hide 1861 */ 1862 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1863 1864 /** 1865 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1866 * @hide 1867 */ 1868 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1869 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1870 1871 1872 /* End of masks for mPrivateFlags2 */ 1873 1874 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1875 1876 /** 1877 * Always allow a user to over-scroll this view, provided it is a 1878 * view that can scroll. 1879 * 1880 * @see #getOverScrollMode() 1881 * @see #setOverScrollMode(int) 1882 */ 1883 public static final int OVER_SCROLL_ALWAYS = 0; 1884 1885 /** 1886 * Allow a user to over-scroll this view only if the content is large 1887 * enough to meaningfully scroll, provided it is a view that can scroll. 1888 * 1889 * @see #getOverScrollMode() 1890 * @see #setOverScrollMode(int) 1891 */ 1892 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1893 1894 /** 1895 * Never allow a user to over-scroll this view. 1896 * 1897 * @see #getOverScrollMode() 1898 * @see #setOverScrollMode(int) 1899 */ 1900 public static final int OVER_SCROLL_NEVER = 2; 1901 1902 /** 1903 * View has requested the system UI (status bar) to be visible (the default). 1904 * 1905 * @see #setSystemUiVisibility(int) 1906 */ 1907 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 1908 1909 /** 1910 * View has requested the system UI to enter an unobtrusive "low profile" mode. 1911 * 1912 * This is for use in games, book readers, video players, or any other "immersive" application 1913 * where the usual system chrome is deemed too distracting. 1914 * 1915 * In low profile mode, the status bar and/or navigation icons may dim. 1916 * 1917 * @see #setSystemUiVisibility(int) 1918 */ 1919 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 1920 1921 /** 1922 * View has requested that the system navigation be temporarily hidden. 1923 * 1924 * This is an even less obtrusive state than that called for by 1925 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 1926 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 1927 * those to disappear. This is useful (in conjunction with the 1928 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 1929 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 1930 * window flags) for displaying content using every last pixel on the display. 1931 * 1932 * There is a limitation: because navigation controls are so important, the least user 1933 * interaction will cause them to reappear immediately. 1934 * 1935 * @see #setSystemUiVisibility(int) 1936 */ 1937 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 1938 1939 /** 1940 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 1941 */ 1942 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 1943 1944 /** 1945 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 1946 */ 1947 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 1948 1949 /** 1950 * @hide 1951 * 1952 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1953 * out of the public fields to keep the undefined bits out of the developer's way. 1954 * 1955 * Flag to make the status bar not expandable. Unless you also 1956 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1957 */ 1958 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1959 1960 /** 1961 * @hide 1962 * 1963 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1964 * out of the public fields to keep the undefined bits out of the developer's way. 1965 * 1966 * Flag to hide notification icons and scrolling ticker text. 1967 */ 1968 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1969 1970 /** 1971 * @hide 1972 * 1973 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1974 * out of the public fields to keep the undefined bits out of the developer's way. 1975 * 1976 * Flag to disable incoming notification alerts. This will not block 1977 * icons, but it will block sound, vibrating and other visual or aural notifications. 1978 */ 1979 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1980 1981 /** 1982 * @hide 1983 * 1984 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1985 * out of the public fields to keep the undefined bits out of the developer's way. 1986 * 1987 * Flag to hide only the scrolling ticker. Note that 1988 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1989 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1990 */ 1991 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1992 1993 /** 1994 * @hide 1995 * 1996 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1997 * out of the public fields to keep the undefined bits out of the developer's way. 1998 * 1999 * Flag to hide the center system info area. 2000 */ 2001 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2002 2003 /** 2004 * @hide 2005 * 2006 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2007 * out of the public fields to keep the undefined bits out of the developer's way. 2008 * 2009 * Flag to hide only the home button. Don't use this 2010 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2011 */ 2012 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2013 2014 /** 2015 * @hide 2016 * 2017 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2018 * out of the public fields to keep the undefined bits out of the developer's way. 2019 * 2020 * Flag to hide only the back button. Don't use this 2021 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2022 */ 2023 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2024 2025 /** 2026 * @hide 2027 * 2028 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2029 * out of the public fields to keep the undefined bits out of the developer's way. 2030 * 2031 * Flag to hide only the clock. You might use this if your activity has 2032 * its own clock making the status bar's clock redundant. 2033 */ 2034 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2035 2036 /** 2037 * @hide 2038 * 2039 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2040 * out of the public fields to keep the undefined bits out of the developer's way. 2041 * 2042 * Flag to hide only the recent apps button. Don't use this 2043 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2044 */ 2045 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2046 2047 /** 2048 * @hide 2049 * 2050 * NOTE: This flag may only be used in subtreeSystemUiVisibility, etc. etc. 2051 * 2052 * This hides HOME and RECENT and is provided for compatibility with interim implementations. 2053 */ 2054 @Deprecated 2055 public static final int STATUS_BAR_DISABLE_NAVIGATION = 2056 STATUS_BAR_DISABLE_HOME | STATUS_BAR_DISABLE_RECENT; 2057 2058 /** 2059 * @hide 2060 */ 2061 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2062 2063 /** 2064 * These are the system UI flags that can be cleared by events outside 2065 * of an application. Currently this is just the ability to tap on the 2066 * screen while hiding the navigation bar to have it return. 2067 * @hide 2068 */ 2069 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2070 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION; 2071 2072 /** 2073 * Find views that render the specified text. 2074 * 2075 * @see #findViewsWithText(ArrayList, CharSequence, int) 2076 */ 2077 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2078 2079 /** 2080 * Find find views that contain the specified content description. 2081 * 2082 * @see #findViewsWithText(ArrayList, CharSequence, int) 2083 */ 2084 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2085 2086 /** 2087 * Find views that contain {@link AccessibilityNodeProvider}. Such 2088 * a View is a root of virtual view hierarchy and may contain the searched 2089 * text. If this flag is set Views with providers are automatically 2090 * added and it is a responsibility of the client to call the APIs of 2091 * the provider to determine whether the virtual tree rooted at this View 2092 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2093 * represeting the virtual views with this text. 2094 * 2095 * @see #findViewsWithText(ArrayList, CharSequence, int) 2096 * 2097 * @hide 2098 */ 2099 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2100 2101 /** 2102 * Indicates that the screen has changed state and is now off. 2103 * 2104 * @see #onScreenStateChanged(int) 2105 */ 2106 public static final int SCREEN_STATE_OFF = 0x0; 2107 2108 /** 2109 * Indicates that the screen has changed state and is now on. 2110 * 2111 * @see #onScreenStateChanged(int) 2112 */ 2113 public static final int SCREEN_STATE_ON = 0x1; 2114 2115 /** 2116 * Controls the over-scroll mode for this view. 2117 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2118 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2119 * and {@link #OVER_SCROLL_NEVER}. 2120 */ 2121 private int mOverScrollMode; 2122 2123 /** 2124 * The parent this view is attached to. 2125 * {@hide} 2126 * 2127 * @see #getParent() 2128 */ 2129 protected ViewParent mParent; 2130 2131 /** 2132 * {@hide} 2133 */ 2134 AttachInfo mAttachInfo; 2135 2136 /** 2137 * {@hide} 2138 */ 2139 @ViewDebug.ExportedProperty(flagMapping = { 2140 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2141 name = "FORCE_LAYOUT"), 2142 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2143 name = "LAYOUT_REQUIRED"), 2144 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2145 name = "DRAWING_CACHE_INVALID", outputIf = false), 2146 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2147 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2148 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2149 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2150 }) 2151 int mPrivateFlags; 2152 int mPrivateFlags2; 2153 2154 /** 2155 * This view's request for the visibility of the status bar. 2156 * @hide 2157 */ 2158 @ViewDebug.ExportedProperty(flagMapping = { 2159 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2160 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2161 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2162 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2163 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2164 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2165 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2166 equals = SYSTEM_UI_FLAG_VISIBLE, 2167 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2168 }) 2169 int mSystemUiVisibility; 2170 2171 /** 2172 * Count of how many windows this view has been attached to. 2173 */ 2174 int mWindowAttachCount; 2175 2176 /** 2177 * The layout parameters associated with this view and used by the parent 2178 * {@link android.view.ViewGroup} to determine how this view should be 2179 * laid out. 2180 * {@hide} 2181 */ 2182 protected ViewGroup.LayoutParams mLayoutParams; 2183 2184 /** 2185 * The view flags hold various views states. 2186 * {@hide} 2187 */ 2188 @ViewDebug.ExportedProperty 2189 int mViewFlags; 2190 2191 static class TransformationInfo { 2192 /** 2193 * The transform matrix for the View. This transform is calculated internally 2194 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2195 * is used by default. Do *not* use this variable directly; instead call 2196 * getMatrix(), which will automatically recalculate the matrix if necessary 2197 * to get the correct matrix based on the latest rotation and scale properties. 2198 */ 2199 private final Matrix mMatrix = new Matrix(); 2200 2201 /** 2202 * The transform matrix for the View. This transform is calculated internally 2203 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2204 * is used by default. Do *not* use this variable directly; instead call 2205 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2206 * to get the correct matrix based on the latest rotation and scale properties. 2207 */ 2208 private Matrix mInverseMatrix; 2209 2210 /** 2211 * An internal variable that tracks whether we need to recalculate the 2212 * transform matrix, based on whether the rotation or scaleX/Y properties 2213 * have changed since the matrix was last calculated. 2214 */ 2215 boolean mMatrixDirty = false; 2216 2217 /** 2218 * An internal variable that tracks whether we need to recalculate the 2219 * transform matrix, based on whether the rotation or scaleX/Y properties 2220 * have changed since the matrix was last calculated. 2221 */ 2222 private boolean mInverseMatrixDirty = true; 2223 2224 /** 2225 * A variable that tracks whether we need to recalculate the 2226 * transform matrix, based on whether the rotation or scaleX/Y properties 2227 * have changed since the matrix was last calculated. This variable 2228 * is only valid after a call to updateMatrix() or to a function that 2229 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2230 */ 2231 private boolean mMatrixIsIdentity = true; 2232 2233 /** 2234 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2235 */ 2236 private Camera mCamera = null; 2237 2238 /** 2239 * This matrix is used when computing the matrix for 3D rotations. 2240 */ 2241 private Matrix matrix3D = null; 2242 2243 /** 2244 * These prev values are used to recalculate a centered pivot point when necessary. The 2245 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2246 * set), so thes values are only used then as well. 2247 */ 2248 private int mPrevWidth = -1; 2249 private int mPrevHeight = -1; 2250 2251 /** 2252 * The degrees rotation around the vertical axis through the pivot point. 2253 */ 2254 @ViewDebug.ExportedProperty 2255 float mRotationY = 0f; 2256 2257 /** 2258 * The degrees rotation around the horizontal axis through the pivot point. 2259 */ 2260 @ViewDebug.ExportedProperty 2261 float mRotationX = 0f; 2262 2263 /** 2264 * The degrees rotation around the pivot point. 2265 */ 2266 @ViewDebug.ExportedProperty 2267 float mRotation = 0f; 2268 2269 /** 2270 * The amount of translation of the object away from its left property (post-layout). 2271 */ 2272 @ViewDebug.ExportedProperty 2273 float mTranslationX = 0f; 2274 2275 /** 2276 * The amount of translation of the object away from its top property (post-layout). 2277 */ 2278 @ViewDebug.ExportedProperty 2279 float mTranslationY = 0f; 2280 2281 /** 2282 * The amount of scale in the x direction around the pivot point. A 2283 * value of 1 means no scaling is applied. 2284 */ 2285 @ViewDebug.ExportedProperty 2286 float mScaleX = 1f; 2287 2288 /** 2289 * The amount of scale in the y direction around the pivot point. A 2290 * value of 1 means no scaling is applied. 2291 */ 2292 @ViewDebug.ExportedProperty 2293 float mScaleY = 1f; 2294 2295 /** 2296 * The x location of the point around which the view is rotated and scaled. 2297 */ 2298 @ViewDebug.ExportedProperty 2299 float mPivotX = 0f; 2300 2301 /** 2302 * The y location of the point around which the view is rotated and scaled. 2303 */ 2304 @ViewDebug.ExportedProperty 2305 float mPivotY = 0f; 2306 2307 /** 2308 * The opacity of the View. This is a value from 0 to 1, where 0 means 2309 * completely transparent and 1 means completely opaque. 2310 */ 2311 @ViewDebug.ExportedProperty 2312 float mAlpha = 1f; 2313 } 2314 2315 TransformationInfo mTransformationInfo; 2316 2317 private boolean mLastIsOpaque; 2318 2319 /** 2320 * Convenience value to check for float values that are close enough to zero to be considered 2321 * zero. 2322 */ 2323 private static final float NONZERO_EPSILON = .001f; 2324 2325 /** 2326 * The distance in pixels from the left edge of this view's parent 2327 * to the left edge of this view. 2328 * {@hide} 2329 */ 2330 @ViewDebug.ExportedProperty(category = "layout") 2331 protected int mLeft; 2332 /** 2333 * The distance in pixels from the left edge of this view's parent 2334 * to the right edge of this view. 2335 * {@hide} 2336 */ 2337 @ViewDebug.ExportedProperty(category = "layout") 2338 protected int mRight; 2339 /** 2340 * The distance in pixels from the top edge of this view's parent 2341 * to the top edge of this view. 2342 * {@hide} 2343 */ 2344 @ViewDebug.ExportedProperty(category = "layout") 2345 protected int mTop; 2346 /** 2347 * The distance in pixels from the top edge of this view's parent 2348 * to the bottom edge of this view. 2349 * {@hide} 2350 */ 2351 @ViewDebug.ExportedProperty(category = "layout") 2352 protected int mBottom; 2353 2354 /** 2355 * The offset, in pixels, by which the content of this view is scrolled 2356 * horizontally. 2357 * {@hide} 2358 */ 2359 @ViewDebug.ExportedProperty(category = "scrolling") 2360 protected int mScrollX; 2361 /** 2362 * The offset, in pixels, by which the content of this view is scrolled 2363 * vertically. 2364 * {@hide} 2365 */ 2366 @ViewDebug.ExportedProperty(category = "scrolling") 2367 protected int mScrollY; 2368 2369 /** 2370 * The left padding in pixels, that is the distance in pixels between the 2371 * left edge of this view and the left edge of its content. 2372 * {@hide} 2373 */ 2374 @ViewDebug.ExportedProperty(category = "padding") 2375 protected int mPaddingLeft; 2376 /** 2377 * The right padding in pixels, that is the distance in pixels between the 2378 * right edge of this view and the right edge of its content. 2379 * {@hide} 2380 */ 2381 @ViewDebug.ExportedProperty(category = "padding") 2382 protected int mPaddingRight; 2383 /** 2384 * The top padding in pixels, that is the distance in pixels between the 2385 * top edge of this view and the top edge of its content. 2386 * {@hide} 2387 */ 2388 @ViewDebug.ExportedProperty(category = "padding") 2389 protected int mPaddingTop; 2390 /** 2391 * The bottom padding in pixels, that is the distance in pixels between the 2392 * bottom edge of this view and the bottom edge of its content. 2393 * {@hide} 2394 */ 2395 @ViewDebug.ExportedProperty(category = "padding") 2396 protected int mPaddingBottom; 2397 2398 /** 2399 * Briefly describes the view and is primarily used for accessibility support. 2400 */ 2401 private CharSequence mContentDescription; 2402 2403 /** 2404 * Cache the paddingRight set by the user to append to the scrollbar's size. 2405 * 2406 * @hide 2407 */ 2408 @ViewDebug.ExportedProperty(category = "padding") 2409 protected int mUserPaddingRight; 2410 2411 /** 2412 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2413 * 2414 * @hide 2415 */ 2416 @ViewDebug.ExportedProperty(category = "padding") 2417 protected int mUserPaddingBottom; 2418 2419 /** 2420 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2421 * 2422 * @hide 2423 */ 2424 @ViewDebug.ExportedProperty(category = "padding") 2425 protected int mUserPaddingLeft; 2426 2427 /** 2428 * Cache if the user padding is relative. 2429 * 2430 */ 2431 @ViewDebug.ExportedProperty(category = "padding") 2432 boolean mUserPaddingRelative; 2433 2434 /** 2435 * Cache the paddingStart set by the user to append to the scrollbar's size. 2436 * 2437 */ 2438 @ViewDebug.ExportedProperty(category = "padding") 2439 int mUserPaddingStart; 2440 2441 /** 2442 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2443 * 2444 */ 2445 @ViewDebug.ExportedProperty(category = "padding") 2446 int mUserPaddingEnd; 2447 2448 /** 2449 * @hide 2450 */ 2451 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2452 /** 2453 * @hide 2454 */ 2455 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2456 2457 private Drawable mBGDrawable; 2458 2459 private int mBackgroundResource; 2460 private boolean mBackgroundSizeChanged; 2461 2462 static class ListenerInfo { 2463 /** 2464 * Listener used to dispatch focus change events. 2465 * This field should be made private, so it is hidden from the SDK. 2466 * {@hide} 2467 */ 2468 protected OnFocusChangeListener mOnFocusChangeListener; 2469 2470 /** 2471 * Listeners for layout change events. 2472 */ 2473 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2474 2475 /** 2476 * Listeners for attach events. 2477 */ 2478 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2479 2480 /** 2481 * Listener used to dispatch click events. 2482 * This field should be made private, so it is hidden from the SDK. 2483 * {@hide} 2484 */ 2485 public OnClickListener mOnClickListener; 2486 2487 /** 2488 * Listener used to dispatch long click events. 2489 * This field should be made private, so it is hidden from the SDK. 2490 * {@hide} 2491 */ 2492 protected OnLongClickListener mOnLongClickListener; 2493 2494 /** 2495 * Listener used to build the context menu. 2496 * This field should be made private, so it is hidden from the SDK. 2497 * {@hide} 2498 */ 2499 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2500 2501 private OnKeyListener mOnKeyListener; 2502 2503 private OnTouchListener mOnTouchListener; 2504 2505 private OnHoverListener mOnHoverListener; 2506 2507 private OnGenericMotionListener mOnGenericMotionListener; 2508 2509 private OnDragListener mOnDragListener; 2510 2511 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2512 } 2513 2514 ListenerInfo mListenerInfo; 2515 2516 /** 2517 * The application environment this view lives in. 2518 * This field should be made private, so it is hidden from the SDK. 2519 * {@hide} 2520 */ 2521 protected Context mContext; 2522 2523 private final Resources mResources; 2524 2525 private ScrollabilityCache mScrollCache; 2526 2527 private int[] mDrawableState = null; 2528 2529 /** 2530 * Set to true when drawing cache is enabled and cannot be created. 2531 * 2532 * @hide 2533 */ 2534 public boolean mCachingFailed; 2535 2536 private Bitmap mDrawingCache; 2537 private Bitmap mUnscaledDrawingCache; 2538 private HardwareLayer mHardwareLayer; 2539 DisplayList mDisplayList; 2540 2541 /** 2542 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2543 * the user may specify which view to go to next. 2544 */ 2545 private int mNextFocusLeftId = View.NO_ID; 2546 2547 /** 2548 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2549 * the user may specify which view to go to next. 2550 */ 2551 private int mNextFocusRightId = View.NO_ID; 2552 2553 /** 2554 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2555 * the user may specify which view to go to next. 2556 */ 2557 private int mNextFocusUpId = View.NO_ID; 2558 2559 /** 2560 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2561 * the user may specify which view to go to next. 2562 */ 2563 private int mNextFocusDownId = View.NO_ID; 2564 2565 /** 2566 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2567 * the user may specify which view to go to next. 2568 */ 2569 int mNextFocusForwardId = View.NO_ID; 2570 2571 private CheckForLongPress mPendingCheckForLongPress; 2572 private CheckForTap mPendingCheckForTap = null; 2573 private PerformClick mPerformClick; 2574 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2575 2576 private UnsetPressedState mUnsetPressedState; 2577 2578 /** 2579 * Whether the long press's action has been invoked. The tap's action is invoked on the 2580 * up event while a long press is invoked as soon as the long press duration is reached, so 2581 * a long press could be performed before the tap is checked, in which case the tap's action 2582 * should not be invoked. 2583 */ 2584 private boolean mHasPerformedLongPress; 2585 2586 /** 2587 * The minimum height of the view. We'll try our best to have the height 2588 * of this view to at least this amount. 2589 */ 2590 @ViewDebug.ExportedProperty(category = "measurement") 2591 private int mMinHeight; 2592 2593 /** 2594 * The minimum width of the view. We'll try our best to have the width 2595 * of this view to at least this amount. 2596 */ 2597 @ViewDebug.ExportedProperty(category = "measurement") 2598 private int mMinWidth; 2599 2600 /** 2601 * The delegate to handle touch events that are physically in this view 2602 * but should be handled by another view. 2603 */ 2604 private TouchDelegate mTouchDelegate = null; 2605 2606 /** 2607 * Solid color to use as a background when creating the drawing cache. Enables 2608 * the cache to use 16 bit bitmaps instead of 32 bit. 2609 */ 2610 private int mDrawingCacheBackgroundColor = 0; 2611 2612 /** 2613 * Special tree observer used when mAttachInfo is null. 2614 */ 2615 private ViewTreeObserver mFloatingTreeObserver; 2616 2617 /** 2618 * Cache the touch slop from the context that created the view. 2619 */ 2620 private int mTouchSlop; 2621 2622 /** 2623 * Object that handles automatic animation of view properties. 2624 */ 2625 private ViewPropertyAnimator mAnimator = null; 2626 2627 /** 2628 * Flag indicating that a drag can cross window boundaries. When 2629 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2630 * with this flag set, all visible applications will be able to participate 2631 * in the drag operation and receive the dragged content. 2632 * 2633 * @hide 2634 */ 2635 public static final int DRAG_FLAG_GLOBAL = 1; 2636 2637 /** 2638 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2639 */ 2640 private float mVerticalScrollFactor; 2641 2642 /** 2643 * Position of the vertical scroll bar. 2644 */ 2645 private int mVerticalScrollbarPosition; 2646 2647 /** 2648 * Position the scroll bar at the default position as determined by the system. 2649 */ 2650 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2651 2652 /** 2653 * Position the scroll bar along the left edge. 2654 */ 2655 public static final int SCROLLBAR_POSITION_LEFT = 1; 2656 2657 /** 2658 * Position the scroll bar along the right edge. 2659 */ 2660 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2661 2662 /** 2663 * Indicates that the view does not have a layer. 2664 * 2665 * @see #getLayerType() 2666 * @see #setLayerType(int, android.graphics.Paint) 2667 * @see #LAYER_TYPE_SOFTWARE 2668 * @see #LAYER_TYPE_HARDWARE 2669 */ 2670 public static final int LAYER_TYPE_NONE = 0; 2671 2672 /** 2673 * <p>Indicates that the view has a software layer. A software layer is backed 2674 * by a bitmap and causes the view to be rendered using Android's software 2675 * rendering pipeline, even if hardware acceleration is enabled.</p> 2676 * 2677 * <p>Software layers have various usages:</p> 2678 * <p>When the application is not using hardware acceleration, a software layer 2679 * is useful to apply a specific color filter and/or blending mode and/or 2680 * translucency to a view and all its children.</p> 2681 * <p>When the application is using hardware acceleration, a software layer 2682 * is useful to render drawing primitives not supported by the hardware 2683 * accelerated pipeline. It can also be used to cache a complex view tree 2684 * into a texture and reduce the complexity of drawing operations. For instance, 2685 * when animating a complex view tree with a translation, a software layer can 2686 * be used to render the view tree only once.</p> 2687 * <p>Software layers should be avoided when the affected view tree updates 2688 * often. Every update will require to re-render the software layer, which can 2689 * potentially be slow (particularly when hardware acceleration is turned on 2690 * since the layer will have to be uploaded into a hardware texture after every 2691 * update.)</p> 2692 * 2693 * @see #getLayerType() 2694 * @see #setLayerType(int, android.graphics.Paint) 2695 * @see #LAYER_TYPE_NONE 2696 * @see #LAYER_TYPE_HARDWARE 2697 */ 2698 public static final int LAYER_TYPE_SOFTWARE = 1; 2699 2700 /** 2701 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2702 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2703 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2704 * rendering pipeline, but only if hardware acceleration is turned on for the 2705 * view hierarchy. When hardware acceleration is turned off, hardware layers 2706 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2707 * 2708 * <p>A hardware layer is useful to apply a specific color filter and/or 2709 * blending mode and/or translucency to a view and all its children.</p> 2710 * <p>A hardware layer can be used to cache a complex view tree into a 2711 * texture and reduce the complexity of drawing operations. For instance, 2712 * when animating a complex view tree with a translation, a hardware layer can 2713 * be used to render the view tree only once.</p> 2714 * <p>A hardware layer can also be used to increase the rendering quality when 2715 * rotation transformations are applied on a view. It can also be used to 2716 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2717 * 2718 * @see #getLayerType() 2719 * @see #setLayerType(int, android.graphics.Paint) 2720 * @see #LAYER_TYPE_NONE 2721 * @see #LAYER_TYPE_SOFTWARE 2722 */ 2723 public static final int LAYER_TYPE_HARDWARE = 2; 2724 2725 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2726 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2727 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2728 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2729 }) 2730 int mLayerType = LAYER_TYPE_NONE; 2731 Paint mLayerPaint; 2732 Rect mLocalDirtyRect; 2733 2734 /** 2735 * Set to true when the view is sending hover accessibility events because it 2736 * is the innermost hovered view. 2737 */ 2738 private boolean mSendingHoverAccessibilityEvents; 2739 2740 /** 2741 * Delegate for injecting accessiblity functionality. 2742 */ 2743 AccessibilityDelegate mAccessibilityDelegate; 2744 2745 /** 2746 * Consistency verifier for debugging purposes. 2747 * @hide 2748 */ 2749 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2750 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2751 new InputEventConsistencyVerifier(this, 0) : null; 2752 2753 /** 2754 * Simple constructor to use when creating a view from code. 2755 * 2756 * @param context The Context the view is running in, through which it can 2757 * access the current theme, resources, etc. 2758 */ 2759 public View(Context context) { 2760 mContext = context; 2761 mResources = context != null ? context.getResources() : null; 2762 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2763 // Set layout and text direction defaults 2764 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 2765 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT); 2766 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2767 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2768 mUserPaddingStart = -1; 2769 mUserPaddingEnd = -1; 2770 mUserPaddingRelative = false; 2771 } 2772 2773 /** 2774 * Constructor that is called when inflating a view from XML. This is called 2775 * when a view is being constructed from an XML file, supplying attributes 2776 * that were specified in the XML file. This version uses a default style of 2777 * 0, so the only attribute values applied are those in the Context's Theme 2778 * and the given AttributeSet. 2779 * 2780 * <p> 2781 * The method onFinishInflate() will be called after all children have been 2782 * added. 2783 * 2784 * @param context The Context the view is running in, through which it can 2785 * access the current theme, resources, etc. 2786 * @param attrs The attributes of the XML tag that is inflating the view. 2787 * @see #View(Context, AttributeSet, int) 2788 */ 2789 public View(Context context, AttributeSet attrs) { 2790 this(context, attrs, 0); 2791 } 2792 2793 /** 2794 * Perform inflation from XML and apply a class-specific base style. This 2795 * constructor of View allows subclasses to use their own base style when 2796 * they are inflating. For example, a Button class's constructor would call 2797 * this version of the super class constructor and supply 2798 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2799 * the theme's button style to modify all of the base view attributes (in 2800 * particular its background) as well as the Button class's attributes. 2801 * 2802 * @param context The Context the view is running in, through which it can 2803 * access the current theme, resources, etc. 2804 * @param attrs The attributes of the XML tag that is inflating the view. 2805 * @param defStyle The default style to apply to this view. If 0, no style 2806 * will be applied (beyond what is included in the theme). This may 2807 * either be an attribute resource, whose value will be retrieved 2808 * from the current theme, or an explicit style resource. 2809 * @see #View(Context, AttributeSet) 2810 */ 2811 public View(Context context, AttributeSet attrs, int defStyle) { 2812 this(context); 2813 2814 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2815 defStyle, 0); 2816 2817 Drawable background = null; 2818 2819 int leftPadding = -1; 2820 int topPadding = -1; 2821 int rightPadding = -1; 2822 int bottomPadding = -1; 2823 int startPadding = -1; 2824 int endPadding = -1; 2825 2826 int padding = -1; 2827 2828 int viewFlagValues = 0; 2829 int viewFlagMasks = 0; 2830 2831 boolean setScrollContainer = false; 2832 2833 int x = 0; 2834 int y = 0; 2835 2836 float tx = 0; 2837 float ty = 0; 2838 float rotation = 0; 2839 float rotationX = 0; 2840 float rotationY = 0; 2841 float sx = 1f; 2842 float sy = 1f; 2843 boolean transformSet = false; 2844 2845 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2846 2847 int overScrollMode = mOverScrollMode; 2848 final int N = a.getIndexCount(); 2849 for (int i = 0; i < N; i++) { 2850 int attr = a.getIndex(i); 2851 switch (attr) { 2852 case com.android.internal.R.styleable.View_background: 2853 background = a.getDrawable(attr); 2854 break; 2855 case com.android.internal.R.styleable.View_padding: 2856 padding = a.getDimensionPixelSize(attr, -1); 2857 break; 2858 case com.android.internal.R.styleable.View_paddingLeft: 2859 leftPadding = a.getDimensionPixelSize(attr, -1); 2860 break; 2861 case com.android.internal.R.styleable.View_paddingTop: 2862 topPadding = a.getDimensionPixelSize(attr, -1); 2863 break; 2864 case com.android.internal.R.styleable.View_paddingRight: 2865 rightPadding = a.getDimensionPixelSize(attr, -1); 2866 break; 2867 case com.android.internal.R.styleable.View_paddingBottom: 2868 bottomPadding = a.getDimensionPixelSize(attr, -1); 2869 break; 2870 case com.android.internal.R.styleable.View_paddingStart: 2871 startPadding = a.getDimensionPixelSize(attr, -1); 2872 break; 2873 case com.android.internal.R.styleable.View_paddingEnd: 2874 endPadding = a.getDimensionPixelSize(attr, -1); 2875 break; 2876 case com.android.internal.R.styleable.View_scrollX: 2877 x = a.getDimensionPixelOffset(attr, 0); 2878 break; 2879 case com.android.internal.R.styleable.View_scrollY: 2880 y = a.getDimensionPixelOffset(attr, 0); 2881 break; 2882 case com.android.internal.R.styleable.View_alpha: 2883 setAlpha(a.getFloat(attr, 1f)); 2884 break; 2885 case com.android.internal.R.styleable.View_transformPivotX: 2886 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2887 break; 2888 case com.android.internal.R.styleable.View_transformPivotY: 2889 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2890 break; 2891 case com.android.internal.R.styleable.View_translationX: 2892 tx = a.getDimensionPixelOffset(attr, 0); 2893 transformSet = true; 2894 break; 2895 case com.android.internal.R.styleable.View_translationY: 2896 ty = a.getDimensionPixelOffset(attr, 0); 2897 transformSet = true; 2898 break; 2899 case com.android.internal.R.styleable.View_rotation: 2900 rotation = a.getFloat(attr, 0); 2901 transformSet = true; 2902 break; 2903 case com.android.internal.R.styleable.View_rotationX: 2904 rotationX = a.getFloat(attr, 0); 2905 transformSet = true; 2906 break; 2907 case com.android.internal.R.styleable.View_rotationY: 2908 rotationY = a.getFloat(attr, 0); 2909 transformSet = true; 2910 break; 2911 case com.android.internal.R.styleable.View_scaleX: 2912 sx = a.getFloat(attr, 1f); 2913 transformSet = true; 2914 break; 2915 case com.android.internal.R.styleable.View_scaleY: 2916 sy = a.getFloat(attr, 1f); 2917 transformSet = true; 2918 break; 2919 case com.android.internal.R.styleable.View_id: 2920 mID = a.getResourceId(attr, NO_ID); 2921 break; 2922 case com.android.internal.R.styleable.View_tag: 2923 mTag = a.getText(attr); 2924 break; 2925 case com.android.internal.R.styleable.View_fitsSystemWindows: 2926 if (a.getBoolean(attr, false)) { 2927 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2928 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2929 } 2930 break; 2931 case com.android.internal.R.styleable.View_focusable: 2932 if (a.getBoolean(attr, false)) { 2933 viewFlagValues |= FOCUSABLE; 2934 viewFlagMasks |= FOCUSABLE_MASK; 2935 } 2936 break; 2937 case com.android.internal.R.styleable.View_focusableInTouchMode: 2938 if (a.getBoolean(attr, false)) { 2939 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2940 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2941 } 2942 break; 2943 case com.android.internal.R.styleable.View_clickable: 2944 if (a.getBoolean(attr, false)) { 2945 viewFlagValues |= CLICKABLE; 2946 viewFlagMasks |= CLICKABLE; 2947 } 2948 break; 2949 case com.android.internal.R.styleable.View_longClickable: 2950 if (a.getBoolean(attr, false)) { 2951 viewFlagValues |= LONG_CLICKABLE; 2952 viewFlagMasks |= LONG_CLICKABLE; 2953 } 2954 break; 2955 case com.android.internal.R.styleable.View_saveEnabled: 2956 if (!a.getBoolean(attr, true)) { 2957 viewFlagValues |= SAVE_DISABLED; 2958 viewFlagMasks |= SAVE_DISABLED_MASK; 2959 } 2960 break; 2961 case com.android.internal.R.styleable.View_duplicateParentState: 2962 if (a.getBoolean(attr, false)) { 2963 viewFlagValues |= DUPLICATE_PARENT_STATE; 2964 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2965 } 2966 break; 2967 case com.android.internal.R.styleable.View_visibility: 2968 final int visibility = a.getInt(attr, 0); 2969 if (visibility != 0) { 2970 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2971 viewFlagMasks |= VISIBILITY_MASK; 2972 } 2973 break; 2974 case com.android.internal.R.styleable.View_layoutDirection: 2975 // Clear any layout direction flags (included resolved bits) already set 2976 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 2977 // Set the layout direction flags depending on the value of the attribute 2978 final int layoutDirection = a.getInt(attr, -1); 2979 final int value = (layoutDirection != -1) ? 2980 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 2981 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 2982 break; 2983 case com.android.internal.R.styleable.View_drawingCacheQuality: 2984 final int cacheQuality = a.getInt(attr, 0); 2985 if (cacheQuality != 0) { 2986 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2987 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2988 } 2989 break; 2990 case com.android.internal.R.styleable.View_contentDescription: 2991 mContentDescription = a.getString(attr); 2992 break; 2993 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2994 if (!a.getBoolean(attr, true)) { 2995 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2996 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2997 } 2998 break; 2999 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3000 if (!a.getBoolean(attr, true)) { 3001 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3002 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3003 } 3004 break; 3005 case R.styleable.View_scrollbars: 3006 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3007 if (scrollbars != SCROLLBARS_NONE) { 3008 viewFlagValues |= scrollbars; 3009 viewFlagMasks |= SCROLLBARS_MASK; 3010 initializeScrollbars(a); 3011 } 3012 break; 3013 //noinspection deprecation 3014 case R.styleable.View_fadingEdge: 3015 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3016 // Ignore the attribute starting with ICS 3017 break; 3018 } 3019 // With builds < ICS, fall through and apply fading edges 3020 case R.styleable.View_requiresFadingEdge: 3021 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3022 if (fadingEdge != FADING_EDGE_NONE) { 3023 viewFlagValues |= fadingEdge; 3024 viewFlagMasks |= FADING_EDGE_MASK; 3025 initializeFadingEdge(a); 3026 } 3027 break; 3028 case R.styleable.View_scrollbarStyle: 3029 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3030 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3031 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3032 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3033 } 3034 break; 3035 case R.styleable.View_isScrollContainer: 3036 setScrollContainer = true; 3037 if (a.getBoolean(attr, false)) { 3038 setScrollContainer(true); 3039 } 3040 break; 3041 case com.android.internal.R.styleable.View_keepScreenOn: 3042 if (a.getBoolean(attr, false)) { 3043 viewFlagValues |= KEEP_SCREEN_ON; 3044 viewFlagMasks |= KEEP_SCREEN_ON; 3045 } 3046 break; 3047 case R.styleable.View_filterTouchesWhenObscured: 3048 if (a.getBoolean(attr, false)) { 3049 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3050 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3051 } 3052 break; 3053 case R.styleable.View_nextFocusLeft: 3054 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3055 break; 3056 case R.styleable.View_nextFocusRight: 3057 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3058 break; 3059 case R.styleable.View_nextFocusUp: 3060 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3061 break; 3062 case R.styleable.View_nextFocusDown: 3063 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3064 break; 3065 case R.styleable.View_nextFocusForward: 3066 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3067 break; 3068 case R.styleable.View_minWidth: 3069 mMinWidth = a.getDimensionPixelSize(attr, 0); 3070 break; 3071 case R.styleable.View_minHeight: 3072 mMinHeight = a.getDimensionPixelSize(attr, 0); 3073 break; 3074 case R.styleable.View_onClick: 3075 if (context.isRestricted()) { 3076 throw new IllegalStateException("The android:onClick attribute cannot " 3077 + "be used within a restricted context"); 3078 } 3079 3080 final String handlerName = a.getString(attr); 3081 if (handlerName != null) { 3082 setOnClickListener(new OnClickListener() { 3083 private Method mHandler; 3084 3085 public void onClick(View v) { 3086 if (mHandler == null) { 3087 try { 3088 mHandler = getContext().getClass().getMethod(handlerName, 3089 View.class); 3090 } catch (NoSuchMethodException e) { 3091 int id = getId(); 3092 String idText = id == NO_ID ? "" : " with id '" 3093 + getContext().getResources().getResourceEntryName( 3094 id) + "'"; 3095 throw new IllegalStateException("Could not find a method " + 3096 handlerName + "(View) in the activity " 3097 + getContext().getClass() + " for onClick handler" 3098 + " on view " + View.this.getClass() + idText, e); 3099 } 3100 } 3101 3102 try { 3103 mHandler.invoke(getContext(), View.this); 3104 } catch (IllegalAccessException e) { 3105 throw new IllegalStateException("Could not execute non " 3106 + "public method of the activity", e); 3107 } catch (InvocationTargetException e) { 3108 throw new IllegalStateException("Could not execute " 3109 + "method of the activity", e); 3110 } 3111 } 3112 }); 3113 } 3114 break; 3115 case R.styleable.View_overScrollMode: 3116 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3117 break; 3118 case R.styleable.View_verticalScrollbarPosition: 3119 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3120 break; 3121 case R.styleable.View_layerType: 3122 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3123 break; 3124 case R.styleable.View_textDirection: 3125 // Clear any text direction flag already set 3126 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3127 // Set the text direction flags depending on the value of the attribute 3128 final int textDirection = a.getInt(attr, -1); 3129 if (textDirection != -1) { 3130 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3131 } 3132 break; 3133 } 3134 } 3135 3136 a.recycle(); 3137 3138 setOverScrollMode(overScrollMode); 3139 3140 if (background != null) { 3141 setBackgroundDrawable(background); 3142 } 3143 3144 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3145 // layout direction). Those cached values will be used later during padding resolution. 3146 mUserPaddingStart = startPadding; 3147 mUserPaddingEnd = endPadding; 3148 3149 updateUserPaddingRelative(); 3150 3151 if (padding >= 0) { 3152 leftPadding = padding; 3153 topPadding = padding; 3154 rightPadding = padding; 3155 bottomPadding = padding; 3156 } 3157 3158 // If the user specified the padding (either with android:padding or 3159 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3160 // use the default padding or the padding from the background drawable 3161 // (stored at this point in mPadding*) 3162 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3163 topPadding >= 0 ? topPadding : mPaddingTop, 3164 rightPadding >= 0 ? rightPadding : mPaddingRight, 3165 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3166 3167 if (viewFlagMasks != 0) { 3168 setFlags(viewFlagValues, viewFlagMasks); 3169 } 3170 3171 // Needs to be called after mViewFlags is set 3172 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3173 recomputePadding(); 3174 } 3175 3176 if (x != 0 || y != 0) { 3177 scrollTo(x, y); 3178 } 3179 3180 if (transformSet) { 3181 setTranslationX(tx); 3182 setTranslationY(ty); 3183 setRotation(rotation); 3184 setRotationX(rotationX); 3185 setRotationY(rotationY); 3186 setScaleX(sx); 3187 setScaleY(sy); 3188 } 3189 3190 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3191 setScrollContainer(true); 3192 } 3193 3194 computeOpaqueFlags(); 3195 } 3196 3197 private void updateUserPaddingRelative() { 3198 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3199 } 3200 3201 /** 3202 * Non-public constructor for use in testing 3203 */ 3204 View() { 3205 mResources = null; 3206 } 3207 3208 /** 3209 * <p> 3210 * Initializes the fading edges from a given set of styled attributes. This 3211 * method should be called by subclasses that need fading edges and when an 3212 * instance of these subclasses is created programmatically rather than 3213 * being inflated from XML. This method is automatically called when the XML 3214 * is inflated. 3215 * </p> 3216 * 3217 * @param a the styled attributes set to initialize the fading edges from 3218 */ 3219 protected void initializeFadingEdge(TypedArray a) { 3220 initScrollCache(); 3221 3222 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3223 R.styleable.View_fadingEdgeLength, 3224 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3225 } 3226 3227 /** 3228 * Returns the size of the vertical faded edges used to indicate that more 3229 * content in this view is visible. 3230 * 3231 * @return The size in pixels of the vertical faded edge or 0 if vertical 3232 * faded edges are not enabled for this view. 3233 * @attr ref android.R.styleable#View_fadingEdgeLength 3234 */ 3235 public int getVerticalFadingEdgeLength() { 3236 if (isVerticalFadingEdgeEnabled()) { 3237 ScrollabilityCache cache = mScrollCache; 3238 if (cache != null) { 3239 return cache.fadingEdgeLength; 3240 } 3241 } 3242 return 0; 3243 } 3244 3245 /** 3246 * Set the size of the faded edge used to indicate that more content in this 3247 * view is available. Will not change whether the fading edge is enabled; use 3248 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3249 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3250 * for the vertical or horizontal fading edges. 3251 * 3252 * @param length The size in pixels of the faded edge used to indicate that more 3253 * content in this view is visible. 3254 */ 3255 public void setFadingEdgeLength(int length) { 3256 initScrollCache(); 3257 mScrollCache.fadingEdgeLength = length; 3258 } 3259 3260 /** 3261 * Returns the size of the horizontal faded edges used to indicate that more 3262 * content in this view is visible. 3263 * 3264 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3265 * faded edges are not enabled for this view. 3266 * @attr ref android.R.styleable#View_fadingEdgeLength 3267 */ 3268 public int getHorizontalFadingEdgeLength() { 3269 if (isHorizontalFadingEdgeEnabled()) { 3270 ScrollabilityCache cache = mScrollCache; 3271 if (cache != null) { 3272 return cache.fadingEdgeLength; 3273 } 3274 } 3275 return 0; 3276 } 3277 3278 /** 3279 * Returns the width of the vertical scrollbar. 3280 * 3281 * @return The width in pixels of the vertical scrollbar or 0 if there 3282 * is no vertical scrollbar. 3283 */ 3284 public int getVerticalScrollbarWidth() { 3285 ScrollabilityCache cache = mScrollCache; 3286 if (cache != null) { 3287 ScrollBarDrawable scrollBar = cache.scrollBar; 3288 if (scrollBar != null) { 3289 int size = scrollBar.getSize(true); 3290 if (size <= 0) { 3291 size = cache.scrollBarSize; 3292 } 3293 return size; 3294 } 3295 return 0; 3296 } 3297 return 0; 3298 } 3299 3300 /** 3301 * Returns the height of the horizontal scrollbar. 3302 * 3303 * @return The height in pixels of the horizontal scrollbar or 0 if 3304 * there is no horizontal scrollbar. 3305 */ 3306 protected int getHorizontalScrollbarHeight() { 3307 ScrollabilityCache cache = mScrollCache; 3308 if (cache != null) { 3309 ScrollBarDrawable scrollBar = cache.scrollBar; 3310 if (scrollBar != null) { 3311 int size = scrollBar.getSize(false); 3312 if (size <= 0) { 3313 size = cache.scrollBarSize; 3314 } 3315 return size; 3316 } 3317 return 0; 3318 } 3319 return 0; 3320 } 3321 3322 /** 3323 * <p> 3324 * Initializes the scrollbars from a given set of styled attributes. This 3325 * method should be called by subclasses that need scrollbars and when an 3326 * instance of these subclasses is created programmatically rather than 3327 * being inflated from XML. This method is automatically called when the XML 3328 * is inflated. 3329 * </p> 3330 * 3331 * @param a the styled attributes set to initialize the scrollbars from 3332 */ 3333 protected void initializeScrollbars(TypedArray a) { 3334 initScrollCache(); 3335 3336 final ScrollabilityCache scrollabilityCache = mScrollCache; 3337 3338 if (scrollabilityCache.scrollBar == null) { 3339 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3340 } 3341 3342 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3343 3344 if (!fadeScrollbars) { 3345 scrollabilityCache.state = ScrollabilityCache.ON; 3346 } 3347 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3348 3349 3350 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3351 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3352 .getScrollBarFadeDuration()); 3353 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3354 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3355 ViewConfiguration.getScrollDefaultDelay()); 3356 3357 3358 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3359 com.android.internal.R.styleable.View_scrollbarSize, 3360 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3361 3362 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3363 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3364 3365 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3366 if (thumb != null) { 3367 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3368 } 3369 3370 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3371 false); 3372 if (alwaysDraw) { 3373 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3374 } 3375 3376 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3377 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3378 3379 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3380 if (thumb != null) { 3381 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3382 } 3383 3384 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3385 false); 3386 if (alwaysDraw) { 3387 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3388 } 3389 3390 // Re-apply user/background padding so that scrollbar(s) get added 3391 resolvePadding(); 3392 } 3393 3394 /** 3395 * <p> 3396 * Initalizes the scrollability cache if necessary. 3397 * </p> 3398 */ 3399 private void initScrollCache() { 3400 if (mScrollCache == null) { 3401 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3402 } 3403 } 3404 3405 /** 3406 * Set the position of the vertical scroll bar. Should be one of 3407 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3408 * {@link #SCROLLBAR_POSITION_RIGHT}. 3409 * 3410 * @param position Where the vertical scroll bar should be positioned. 3411 */ 3412 public void setVerticalScrollbarPosition(int position) { 3413 if (mVerticalScrollbarPosition != position) { 3414 mVerticalScrollbarPosition = position; 3415 computeOpaqueFlags(); 3416 resolvePadding(); 3417 } 3418 } 3419 3420 /** 3421 * @return The position where the vertical scroll bar will show, if applicable. 3422 * @see #setVerticalScrollbarPosition(int) 3423 */ 3424 public int getVerticalScrollbarPosition() { 3425 return mVerticalScrollbarPosition; 3426 } 3427 3428 ListenerInfo getListenerInfo() { 3429 if (mListenerInfo != null) { 3430 return mListenerInfo; 3431 } 3432 mListenerInfo = new ListenerInfo(); 3433 return mListenerInfo; 3434 } 3435 3436 /** 3437 * Register a callback to be invoked when focus of this view changed. 3438 * 3439 * @param l The callback that will run. 3440 */ 3441 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3442 getListenerInfo().mOnFocusChangeListener = l; 3443 } 3444 3445 /** 3446 * Add a listener that will be called when the bounds of the view change due to 3447 * layout processing. 3448 * 3449 * @param listener The listener that will be called when layout bounds change. 3450 */ 3451 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3452 ListenerInfo li = getListenerInfo(); 3453 if (li.mOnLayoutChangeListeners == null) { 3454 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3455 } 3456 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3457 li.mOnLayoutChangeListeners.add(listener); 3458 } 3459 } 3460 3461 /** 3462 * Remove a listener for layout changes. 3463 * 3464 * @param listener The listener for layout bounds change. 3465 */ 3466 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3467 ListenerInfo li = mListenerInfo; 3468 if (li == null || li.mOnLayoutChangeListeners == null) { 3469 return; 3470 } 3471 li.mOnLayoutChangeListeners.remove(listener); 3472 } 3473 3474 /** 3475 * Add a listener for attach state changes. 3476 * 3477 * This listener will be called whenever this view is attached or detached 3478 * from a window. Remove the listener using 3479 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3480 * 3481 * @param listener Listener to attach 3482 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3483 */ 3484 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3485 ListenerInfo li = getListenerInfo(); 3486 if (li.mOnAttachStateChangeListeners == null) { 3487 li.mOnAttachStateChangeListeners 3488 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3489 } 3490 li.mOnAttachStateChangeListeners.add(listener); 3491 } 3492 3493 /** 3494 * Remove a listener for attach state changes. The listener will receive no further 3495 * notification of window attach/detach events. 3496 * 3497 * @param listener Listener to remove 3498 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3499 */ 3500 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3501 ListenerInfo li = mListenerInfo; 3502 if (li == null || li.mOnAttachStateChangeListeners == null) { 3503 return; 3504 } 3505 li.mOnAttachStateChangeListeners.remove(listener); 3506 } 3507 3508 /** 3509 * Returns the focus-change callback registered for this view. 3510 * 3511 * @return The callback, or null if one is not registered. 3512 */ 3513 public OnFocusChangeListener getOnFocusChangeListener() { 3514 ListenerInfo li = mListenerInfo; 3515 return li != null ? li.mOnFocusChangeListener : null; 3516 } 3517 3518 /** 3519 * Register a callback to be invoked when this view is clicked. If this view is not 3520 * clickable, it becomes clickable. 3521 * 3522 * @param l The callback that will run 3523 * 3524 * @see #setClickable(boolean) 3525 */ 3526 public void setOnClickListener(OnClickListener l) { 3527 if (!isClickable()) { 3528 setClickable(true); 3529 } 3530 getListenerInfo().mOnClickListener = l; 3531 } 3532 3533 /** 3534 * Return whether this view has an attached OnClickListener. Returns 3535 * true if there is a listener, false if there is none. 3536 */ 3537 public boolean hasOnClickListeners() { 3538 ListenerInfo li = mListenerInfo; 3539 return (li != null && li.mOnClickListener != null); 3540 } 3541 3542 /** 3543 * Register a callback to be invoked when this view is clicked and held. If this view is not 3544 * long clickable, it becomes long clickable. 3545 * 3546 * @param l The callback that will run 3547 * 3548 * @see #setLongClickable(boolean) 3549 */ 3550 public void setOnLongClickListener(OnLongClickListener l) { 3551 if (!isLongClickable()) { 3552 setLongClickable(true); 3553 } 3554 getListenerInfo().mOnLongClickListener = l; 3555 } 3556 3557 /** 3558 * Register a callback to be invoked when the context menu for this view is 3559 * being built. If this view is not long clickable, it becomes long clickable. 3560 * 3561 * @param l The callback that will run 3562 * 3563 */ 3564 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3565 if (!isLongClickable()) { 3566 setLongClickable(true); 3567 } 3568 getListenerInfo().mOnCreateContextMenuListener = l; 3569 } 3570 3571 /** 3572 * Call this view's OnClickListener, if it is defined. Performs all normal 3573 * actions associated with clicking: reporting accessibility event, playing 3574 * a sound, etc. 3575 * 3576 * @return True there was an assigned OnClickListener that was called, false 3577 * otherwise is returned. 3578 */ 3579 public boolean performClick() { 3580 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3581 3582 ListenerInfo li = mListenerInfo; 3583 if (li != null && li.mOnClickListener != null) { 3584 playSoundEffect(SoundEffectConstants.CLICK); 3585 li.mOnClickListener.onClick(this); 3586 return true; 3587 } 3588 3589 return false; 3590 } 3591 3592 /** 3593 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3594 * this only calls the listener, and does not do any associated clicking 3595 * actions like reporting an accessibility event. 3596 * 3597 * @return True there was an assigned OnClickListener that was called, false 3598 * otherwise is returned. 3599 */ 3600 public boolean callOnClick() { 3601 ListenerInfo li = mListenerInfo; 3602 if (li != null && li.mOnClickListener != null) { 3603 li.mOnClickListener.onClick(this); 3604 return true; 3605 } 3606 return false; 3607 } 3608 3609 /** 3610 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3611 * OnLongClickListener did not consume the event. 3612 * 3613 * @return True if one of the above receivers consumed the event, false otherwise. 3614 */ 3615 public boolean performLongClick() { 3616 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3617 3618 boolean handled = false; 3619 ListenerInfo li = mListenerInfo; 3620 if (li != null && li.mOnLongClickListener != null) { 3621 handled = li.mOnLongClickListener.onLongClick(View.this); 3622 } 3623 if (!handled) { 3624 handled = showContextMenu(); 3625 } 3626 if (handled) { 3627 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3628 } 3629 return handled; 3630 } 3631 3632 /** 3633 * Performs button-related actions during a touch down event. 3634 * 3635 * @param event The event. 3636 * @return True if the down was consumed. 3637 * 3638 * @hide 3639 */ 3640 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3641 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3642 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3643 return true; 3644 } 3645 } 3646 return false; 3647 } 3648 3649 /** 3650 * Bring up the context menu for this view. 3651 * 3652 * @return Whether a context menu was displayed. 3653 */ 3654 public boolean showContextMenu() { 3655 return getParent().showContextMenuForChild(this); 3656 } 3657 3658 /** 3659 * Bring up the context menu for this view, referring to the item under the specified point. 3660 * 3661 * @param x The referenced x coordinate. 3662 * @param y The referenced y coordinate. 3663 * @param metaState The keyboard modifiers that were pressed. 3664 * @return Whether a context menu was displayed. 3665 * 3666 * @hide 3667 */ 3668 public boolean showContextMenu(float x, float y, int metaState) { 3669 return showContextMenu(); 3670 } 3671 3672 /** 3673 * Start an action mode. 3674 * 3675 * @param callback Callback that will control the lifecycle of the action mode 3676 * @return The new action mode if it is started, null otherwise 3677 * 3678 * @see ActionMode 3679 */ 3680 public ActionMode startActionMode(ActionMode.Callback callback) { 3681 ViewParent parent = getParent(); 3682 if (parent == null) return null; 3683 return parent.startActionModeForChild(this, callback); 3684 } 3685 3686 /** 3687 * Register a callback to be invoked when a key is pressed in this view. 3688 * @param l the key listener to attach to this view 3689 */ 3690 public void setOnKeyListener(OnKeyListener l) { 3691 getListenerInfo().mOnKeyListener = l; 3692 } 3693 3694 /** 3695 * Register a callback to be invoked when a touch event is sent to this view. 3696 * @param l the touch listener to attach to this view 3697 */ 3698 public void setOnTouchListener(OnTouchListener l) { 3699 getListenerInfo().mOnTouchListener = l; 3700 } 3701 3702 /** 3703 * Register a callback to be invoked when a generic motion event is sent to this view. 3704 * @param l the generic motion listener to attach to this view 3705 */ 3706 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3707 getListenerInfo().mOnGenericMotionListener = l; 3708 } 3709 3710 /** 3711 * Register a callback to be invoked when a hover event is sent to this view. 3712 * @param l the hover listener to attach to this view 3713 */ 3714 public void setOnHoverListener(OnHoverListener l) { 3715 getListenerInfo().mOnHoverListener = l; 3716 } 3717 3718 /** 3719 * Register a drag event listener callback object for this View. The parameter is 3720 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3721 * View, the system calls the 3722 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3723 * @param l An implementation of {@link android.view.View.OnDragListener}. 3724 */ 3725 public void setOnDragListener(OnDragListener l) { 3726 getListenerInfo().mOnDragListener = l; 3727 } 3728 3729 /** 3730 * Give this view focus. This will cause 3731 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3732 * 3733 * Note: this does not check whether this {@link View} should get focus, it just 3734 * gives it focus no matter what. It should only be called internally by framework 3735 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3736 * 3737 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3738 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3739 * focus moved when requestFocus() is called. It may not always 3740 * apply, in which case use the default View.FOCUS_DOWN. 3741 * @param previouslyFocusedRect The rectangle of the view that had focus 3742 * prior in this View's coordinate system. 3743 */ 3744 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3745 if (DBG) { 3746 System.out.println(this + " requestFocus()"); 3747 } 3748 3749 if ((mPrivateFlags & FOCUSED) == 0) { 3750 mPrivateFlags |= FOCUSED; 3751 3752 if (mParent != null) { 3753 mParent.requestChildFocus(this, this); 3754 } 3755 3756 onFocusChanged(true, direction, previouslyFocusedRect); 3757 refreshDrawableState(); 3758 } 3759 } 3760 3761 /** 3762 * Request that a rectangle of this view be visible on the screen, 3763 * scrolling if necessary just enough. 3764 * 3765 * <p>A View should call this if it maintains some notion of which part 3766 * of its content is interesting. For example, a text editing view 3767 * should call this when its cursor moves. 3768 * 3769 * @param rectangle The rectangle. 3770 * @return Whether any parent scrolled. 3771 */ 3772 public boolean requestRectangleOnScreen(Rect rectangle) { 3773 return requestRectangleOnScreen(rectangle, false); 3774 } 3775 3776 /** 3777 * Request that a rectangle of this view be visible on the screen, 3778 * scrolling if necessary just enough. 3779 * 3780 * <p>A View should call this if it maintains some notion of which part 3781 * of its content is interesting. For example, a text editing view 3782 * should call this when its cursor moves. 3783 * 3784 * <p>When <code>immediate</code> is set to true, scrolling will not be 3785 * animated. 3786 * 3787 * @param rectangle The rectangle. 3788 * @param immediate True to forbid animated scrolling, false otherwise 3789 * @return Whether any parent scrolled. 3790 */ 3791 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3792 View child = this; 3793 ViewParent parent = mParent; 3794 boolean scrolled = false; 3795 while (parent != null) { 3796 scrolled |= parent.requestChildRectangleOnScreen(child, 3797 rectangle, immediate); 3798 3799 // offset rect so next call has the rectangle in the 3800 // coordinate system of its direct child. 3801 rectangle.offset(child.getLeft(), child.getTop()); 3802 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3803 3804 if (!(parent instanceof View)) { 3805 break; 3806 } 3807 3808 child = (View) parent; 3809 parent = child.getParent(); 3810 } 3811 return scrolled; 3812 } 3813 3814 /** 3815 * Called when this view wants to give up focus. If focus is cleared 3816 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 3817 * <p> 3818 * <strong>Note:</strong> When a View clears focus the framework is trying 3819 * to give focus to the first focusable View from the top. Hence, if this 3820 * View is the first from the top that can take focus, then its focus will 3821 * not be cleared nor will the focus change callback be invoked. 3822 * </p> 3823 */ 3824 public void clearFocus() { 3825 if (DBG) { 3826 System.out.println(this + " clearFocus()"); 3827 } 3828 3829 if ((mPrivateFlags & FOCUSED) != 0) { 3830 mPrivateFlags &= ~FOCUSED; 3831 3832 if (mParent != null) { 3833 mParent.clearChildFocus(this); 3834 } 3835 3836 onFocusChanged(false, 0, null); 3837 refreshDrawableState(); 3838 } 3839 } 3840 3841 /** 3842 * Called to clear the focus of a view that is about to be removed. 3843 * Doesn't call clearChildFocus, which prevents this view from taking 3844 * focus again before it has been removed from the parent 3845 */ 3846 void clearFocusForRemoval() { 3847 if ((mPrivateFlags & FOCUSED) != 0) { 3848 mPrivateFlags &= ~FOCUSED; 3849 3850 onFocusChanged(false, 0, null); 3851 refreshDrawableState(); 3852 3853 // The view cleared focus and invoked the callbacks, so now is the 3854 // time to give focus to the the first focusable from the top to 3855 // ensure that the gain focus is announced after clear focus. 3856 getRootView().requestFocus(FOCUS_FORWARD); 3857 } 3858 } 3859 3860 /** 3861 * Called internally by the view system when a new view is getting focus. 3862 * This is what clears the old focus. 3863 */ 3864 void unFocus() { 3865 if (DBG) { 3866 System.out.println(this + " unFocus()"); 3867 } 3868 3869 if ((mPrivateFlags & FOCUSED) != 0) { 3870 mPrivateFlags &= ~FOCUSED; 3871 3872 onFocusChanged(false, 0, null); 3873 refreshDrawableState(); 3874 } 3875 } 3876 3877 /** 3878 * Returns true if this view has focus iteself, or is the ancestor of the 3879 * view that has focus. 3880 * 3881 * @return True if this view has or contains focus, false otherwise. 3882 */ 3883 @ViewDebug.ExportedProperty(category = "focus") 3884 public boolean hasFocus() { 3885 return (mPrivateFlags & FOCUSED) != 0; 3886 } 3887 3888 /** 3889 * Returns true if this view is focusable or if it contains a reachable View 3890 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3891 * is a View whose parents do not block descendants focus. 3892 * 3893 * Only {@link #VISIBLE} views are considered focusable. 3894 * 3895 * @return True if the view is focusable or if the view contains a focusable 3896 * View, false otherwise. 3897 * 3898 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3899 */ 3900 public boolean hasFocusable() { 3901 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3902 } 3903 3904 /** 3905 * Called by the view system when the focus state of this view changes. 3906 * When the focus change event is caused by directional navigation, direction 3907 * and previouslyFocusedRect provide insight into where the focus is coming from. 3908 * When overriding, be sure to call up through to the super class so that 3909 * the standard focus handling will occur. 3910 * 3911 * @param gainFocus True if the View has focus; false otherwise. 3912 * @param direction The direction focus has moved when requestFocus() 3913 * is called to give this view focus. Values are 3914 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3915 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3916 * It may not always apply, in which case use the default. 3917 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3918 * system, of the previously focused view. If applicable, this will be 3919 * passed in as finer grained information about where the focus is coming 3920 * from (in addition to direction). Will be <code>null</code> otherwise. 3921 */ 3922 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3923 if (gainFocus) { 3924 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3925 } 3926 3927 InputMethodManager imm = InputMethodManager.peekInstance(); 3928 if (!gainFocus) { 3929 if (isPressed()) { 3930 setPressed(false); 3931 } 3932 if (imm != null && mAttachInfo != null 3933 && mAttachInfo.mHasWindowFocus) { 3934 imm.focusOut(this); 3935 } 3936 onFocusLost(); 3937 } else if (imm != null && mAttachInfo != null 3938 && mAttachInfo.mHasWindowFocus) { 3939 imm.focusIn(this); 3940 } 3941 3942 invalidate(true); 3943 ListenerInfo li = mListenerInfo; 3944 if (li != null && li.mOnFocusChangeListener != null) { 3945 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 3946 } 3947 3948 if (mAttachInfo != null) { 3949 mAttachInfo.mKeyDispatchState.reset(this); 3950 } 3951 } 3952 3953 /** 3954 * Sends an accessibility event of the given type. If accessiiblity is 3955 * not enabled this method has no effect. The default implementation calls 3956 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3957 * to populate information about the event source (this View), then calls 3958 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3959 * populate the text content of the event source including its descendants, 3960 * and last calls 3961 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3962 * on its parent to resuest sending of the event to interested parties. 3963 * <p> 3964 * If an {@link AccessibilityDelegate} has been specified via calling 3965 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3966 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 3967 * responsible for handling this call. 3968 * </p> 3969 * 3970 * @param eventType The type of the event to send, as defined by several types from 3971 * {@link android.view.accessibility.AccessibilityEvent}, such as 3972 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 3973 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 3974 * 3975 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3976 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3977 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3978 * @see AccessibilityDelegate 3979 */ 3980 public void sendAccessibilityEvent(int eventType) { 3981 if (mAccessibilityDelegate != null) { 3982 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 3983 } else { 3984 sendAccessibilityEventInternal(eventType); 3985 } 3986 } 3987 3988 /** 3989 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 3990 * {@link AccessibilityEvent} to make an announcement which is related to some 3991 * sort of a context change for which none of the events representing UI transitions 3992 * is a good fit. For example, announcing a new page in a book. If accessibility 3993 * is not enabled this method does nothing. 3994 * 3995 * @param text The announcement text. 3996 */ 3997 public void announceForAccessibility(CharSequence text) { 3998 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3999 AccessibilityEvent event = AccessibilityEvent.obtain( 4000 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4001 event.getText().add(text); 4002 sendAccessibilityEventUnchecked(event); 4003 } 4004 } 4005 4006 /** 4007 * @see #sendAccessibilityEvent(int) 4008 * 4009 * Note: Called from the default {@link AccessibilityDelegate}. 4010 */ 4011 void sendAccessibilityEventInternal(int eventType) { 4012 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4013 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4014 } 4015 } 4016 4017 /** 4018 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4019 * takes as an argument an empty {@link AccessibilityEvent} and does not 4020 * perform a check whether accessibility is enabled. 4021 * <p> 4022 * If an {@link AccessibilityDelegate} has been specified via calling 4023 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4024 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4025 * is responsible for handling this call. 4026 * </p> 4027 * 4028 * @param event The event to send. 4029 * 4030 * @see #sendAccessibilityEvent(int) 4031 */ 4032 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4033 if (mAccessibilityDelegate != null) { 4034 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4035 } else { 4036 sendAccessibilityEventUncheckedInternal(event); 4037 } 4038 } 4039 4040 /** 4041 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4042 * 4043 * Note: Called from the default {@link AccessibilityDelegate}. 4044 */ 4045 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4046 if (!isShown()) { 4047 return; 4048 } 4049 onInitializeAccessibilityEvent(event); 4050 // Only a subset of accessibility events populates text content. 4051 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4052 dispatchPopulateAccessibilityEvent(event); 4053 } 4054 // In the beginning we called #isShown(), so we know that getParent() is not null. 4055 getParent().requestSendAccessibilityEvent(this, event); 4056 } 4057 4058 /** 4059 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4060 * to its children for adding their text content to the event. Note that the 4061 * event text is populated in a separate dispatch path since we add to the 4062 * event not only the text of the source but also the text of all its descendants. 4063 * A typical implementation will call 4064 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4065 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4066 * on each child. Override this method if custom population of the event text 4067 * content is required. 4068 * <p> 4069 * If an {@link AccessibilityDelegate} has been specified via calling 4070 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4071 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4072 * is responsible for handling this call. 4073 * </p> 4074 * <p> 4075 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4076 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4077 * </p> 4078 * 4079 * @param event The event. 4080 * 4081 * @return True if the event population was completed. 4082 */ 4083 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4084 if (mAccessibilityDelegate != null) { 4085 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4086 } else { 4087 return dispatchPopulateAccessibilityEventInternal(event); 4088 } 4089 } 4090 4091 /** 4092 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4093 * 4094 * Note: Called from the default {@link AccessibilityDelegate}. 4095 */ 4096 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4097 onPopulateAccessibilityEvent(event); 4098 return false; 4099 } 4100 4101 /** 4102 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4103 * giving a chance to this View to populate the accessibility event with its 4104 * text content. While this method is free to modify event 4105 * attributes other than text content, doing so should normally be performed in 4106 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4107 * <p> 4108 * Example: Adding formatted date string to an accessibility event in addition 4109 * to the text added by the super implementation: 4110 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4111 * super.onPopulateAccessibilityEvent(event); 4112 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4113 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4114 * mCurrentDate.getTimeInMillis(), flags); 4115 * event.getText().add(selectedDateUtterance); 4116 * }</pre> 4117 * <p> 4118 * If an {@link AccessibilityDelegate} has been specified via calling 4119 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4120 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4121 * is responsible for handling this call. 4122 * </p> 4123 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4124 * information to the event, in case the default implementation has basic information to add. 4125 * </p> 4126 * 4127 * @param event The accessibility event which to populate. 4128 * 4129 * @see #sendAccessibilityEvent(int) 4130 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4131 */ 4132 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4133 if (mAccessibilityDelegate != null) { 4134 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4135 } else { 4136 onPopulateAccessibilityEventInternal(event); 4137 } 4138 } 4139 4140 /** 4141 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4142 * 4143 * Note: Called from the default {@link AccessibilityDelegate}. 4144 */ 4145 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4146 4147 } 4148 4149 /** 4150 * Initializes an {@link AccessibilityEvent} with information about 4151 * this View which is the event source. In other words, the source of 4152 * an accessibility event is the view whose state change triggered firing 4153 * the event. 4154 * <p> 4155 * Example: Setting the password property of an event in addition 4156 * to properties set by the super implementation: 4157 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4158 * super.onInitializeAccessibilityEvent(event); 4159 * event.setPassword(true); 4160 * }</pre> 4161 * <p> 4162 * If an {@link AccessibilityDelegate} has been specified via calling 4163 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4164 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4165 * is responsible for handling this call. 4166 * </p> 4167 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4168 * information to the event, in case the default implementation has basic information to add. 4169 * </p> 4170 * @param event The event to initialize. 4171 * 4172 * @see #sendAccessibilityEvent(int) 4173 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4174 */ 4175 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4176 if (mAccessibilityDelegate != null) { 4177 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4178 } else { 4179 onInitializeAccessibilityEventInternal(event); 4180 } 4181 } 4182 4183 /** 4184 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4185 * 4186 * Note: Called from the default {@link AccessibilityDelegate}. 4187 */ 4188 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4189 event.setSource(this); 4190 event.setClassName(View.class.getName()); 4191 event.setPackageName(getContext().getPackageName()); 4192 event.setEnabled(isEnabled()); 4193 event.setContentDescription(mContentDescription); 4194 4195 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4196 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 4197 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4198 FOCUSABLES_ALL); 4199 event.setItemCount(focusablesTempList.size()); 4200 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4201 focusablesTempList.clear(); 4202 } 4203 } 4204 4205 /** 4206 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4207 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4208 * This method is responsible for obtaining an accessibility node info from a 4209 * pool of reusable instances and calling 4210 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4211 * initialize the former. 4212 * <p> 4213 * Note: The client is responsible for recycling the obtained instance by calling 4214 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4215 * </p> 4216 * 4217 * @return A populated {@link AccessibilityNodeInfo}. 4218 * 4219 * @see AccessibilityNodeInfo 4220 */ 4221 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4222 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4223 if (provider != null) { 4224 return provider.createAccessibilityNodeInfo(View.NO_ID); 4225 } else { 4226 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4227 onInitializeAccessibilityNodeInfo(info); 4228 return info; 4229 } 4230 } 4231 4232 /** 4233 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4234 * The base implementation sets: 4235 * <ul> 4236 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4237 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4238 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4239 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4240 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4241 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4242 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4243 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4244 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4245 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4246 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4247 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4248 * </ul> 4249 * <p> 4250 * Subclasses should override this method, call the super implementation, 4251 * and set additional attributes. 4252 * </p> 4253 * <p> 4254 * If an {@link AccessibilityDelegate} has been specified via calling 4255 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4256 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4257 * is responsible for handling this call. 4258 * </p> 4259 * 4260 * @param info The instance to initialize. 4261 */ 4262 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4263 if (mAccessibilityDelegate != null) { 4264 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4265 } else { 4266 onInitializeAccessibilityNodeInfoInternal(info); 4267 } 4268 } 4269 4270 /** 4271 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4272 * 4273 * Note: Called from the default {@link AccessibilityDelegate}. 4274 */ 4275 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4276 Rect bounds = mAttachInfo.mTmpInvalRect; 4277 getDrawingRect(bounds); 4278 info.setBoundsInParent(bounds); 4279 4280 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 4281 getLocationOnScreen(locationOnScreen); 4282 bounds.offsetTo(0, 0); 4283 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 4284 info.setBoundsInScreen(bounds); 4285 4286 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4287 ViewParent parent = getParent(); 4288 if (parent instanceof View) { 4289 View parentView = (View) parent; 4290 info.setParent(parentView); 4291 } 4292 } 4293 4294 info.setPackageName(mContext.getPackageName()); 4295 info.setClassName(View.class.getName()); 4296 info.setContentDescription(getContentDescription()); 4297 4298 info.setEnabled(isEnabled()); 4299 info.setClickable(isClickable()); 4300 info.setFocusable(isFocusable()); 4301 info.setFocused(isFocused()); 4302 info.setSelected(isSelected()); 4303 info.setLongClickable(isLongClickable()); 4304 4305 // TODO: These make sense only if we are in an AdapterView but all 4306 // views can be selected. Maybe from accessiiblity perspective 4307 // we should report as selectable view in an AdapterView. 4308 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4309 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4310 4311 if (isFocusable()) { 4312 if (isFocused()) { 4313 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4314 } else { 4315 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4316 } 4317 } 4318 } 4319 4320 /** 4321 * Sets a delegate for implementing accessibility support via compositon as 4322 * opposed to inheritance. The delegate's primary use is for implementing 4323 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4324 * 4325 * @param delegate The delegate instance. 4326 * 4327 * @see AccessibilityDelegate 4328 */ 4329 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4330 mAccessibilityDelegate = delegate; 4331 } 4332 4333 /** 4334 * Gets the provider for managing a virtual view hierarchy rooted at this View 4335 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4336 * that explore the window content. 4337 * <p> 4338 * If this method returns an instance, this instance is responsible for managing 4339 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4340 * View including the one representing the View itself. Similarly the returned 4341 * instance is responsible for performing accessibility actions on any virtual 4342 * view or the root view itself. 4343 * </p> 4344 * <p> 4345 * If an {@link AccessibilityDelegate} has been specified via calling 4346 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4347 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4348 * is responsible for handling this call. 4349 * </p> 4350 * 4351 * @return The provider. 4352 * 4353 * @see AccessibilityNodeProvider 4354 */ 4355 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4356 if (mAccessibilityDelegate != null) { 4357 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4358 } else { 4359 return null; 4360 } 4361 } 4362 4363 /** 4364 * Gets the unique identifier of this view on the screen for accessibility purposes. 4365 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4366 * 4367 * @return The view accessibility id. 4368 * 4369 * @hide 4370 */ 4371 public int getAccessibilityViewId() { 4372 if (mAccessibilityViewId == NO_ID) { 4373 mAccessibilityViewId = sNextAccessibilityViewId++; 4374 } 4375 return mAccessibilityViewId; 4376 } 4377 4378 /** 4379 * Gets the unique identifier of the window in which this View reseides. 4380 * 4381 * @return The window accessibility id. 4382 * 4383 * @hide 4384 */ 4385 public int getAccessibilityWindowId() { 4386 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4387 } 4388 4389 /** 4390 * Gets the {@link View} description. It briefly describes the view and is 4391 * primarily used for accessibility support. Set this property to enable 4392 * better accessibility support for your application. This is especially 4393 * true for views that do not have textual representation (For example, 4394 * ImageButton). 4395 * 4396 * @return The content descriptiopn. 4397 * 4398 * @attr ref android.R.styleable#View_contentDescription 4399 */ 4400 public CharSequence getContentDescription() { 4401 return mContentDescription; 4402 } 4403 4404 /** 4405 * Sets the {@link View} description. It briefly describes the view and is 4406 * primarily used for accessibility support. Set this property to enable 4407 * better accessibility support for your application. This is especially 4408 * true for views that do not have textual representation (For example, 4409 * ImageButton). 4410 * 4411 * @param contentDescription The content description. 4412 * 4413 * @attr ref android.R.styleable#View_contentDescription 4414 */ 4415 @RemotableViewMethod 4416 public void setContentDescription(CharSequence contentDescription) { 4417 mContentDescription = contentDescription; 4418 } 4419 4420 /** 4421 * Invoked whenever this view loses focus, either by losing window focus or by losing 4422 * focus within its window. This method can be used to clear any state tied to the 4423 * focus. For instance, if a button is held pressed with the trackball and the window 4424 * loses focus, this method can be used to cancel the press. 4425 * 4426 * Subclasses of View overriding this method should always call super.onFocusLost(). 4427 * 4428 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4429 * @see #onWindowFocusChanged(boolean) 4430 * 4431 * @hide pending API council approval 4432 */ 4433 protected void onFocusLost() { 4434 resetPressedState(); 4435 } 4436 4437 private void resetPressedState() { 4438 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4439 return; 4440 } 4441 4442 if (isPressed()) { 4443 setPressed(false); 4444 4445 if (!mHasPerformedLongPress) { 4446 removeLongPressCallback(); 4447 } 4448 } 4449 } 4450 4451 /** 4452 * Returns true if this view has focus 4453 * 4454 * @return True if this view has focus, false otherwise. 4455 */ 4456 @ViewDebug.ExportedProperty(category = "focus") 4457 public boolean isFocused() { 4458 return (mPrivateFlags & FOCUSED) != 0; 4459 } 4460 4461 /** 4462 * Find the view in the hierarchy rooted at this view that currently has 4463 * focus. 4464 * 4465 * @return The view that currently has focus, or null if no focused view can 4466 * be found. 4467 */ 4468 public View findFocus() { 4469 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4470 } 4471 4472 /** 4473 * Change whether this view is one of the set of scrollable containers in 4474 * its window. This will be used to determine whether the window can 4475 * resize or must pan when a soft input area is open -- scrollable 4476 * containers allow the window to use resize mode since the container 4477 * will appropriately shrink. 4478 */ 4479 public void setScrollContainer(boolean isScrollContainer) { 4480 if (isScrollContainer) { 4481 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4482 mAttachInfo.mScrollContainers.add(this); 4483 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4484 } 4485 mPrivateFlags |= SCROLL_CONTAINER; 4486 } else { 4487 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4488 mAttachInfo.mScrollContainers.remove(this); 4489 } 4490 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4491 } 4492 } 4493 4494 /** 4495 * Returns the quality of the drawing cache. 4496 * 4497 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4498 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4499 * 4500 * @see #setDrawingCacheQuality(int) 4501 * @see #setDrawingCacheEnabled(boolean) 4502 * @see #isDrawingCacheEnabled() 4503 * 4504 * @attr ref android.R.styleable#View_drawingCacheQuality 4505 */ 4506 public int getDrawingCacheQuality() { 4507 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4508 } 4509 4510 /** 4511 * Set the drawing cache quality of this view. This value is used only when the 4512 * drawing cache is enabled 4513 * 4514 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4515 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4516 * 4517 * @see #getDrawingCacheQuality() 4518 * @see #setDrawingCacheEnabled(boolean) 4519 * @see #isDrawingCacheEnabled() 4520 * 4521 * @attr ref android.R.styleable#View_drawingCacheQuality 4522 */ 4523 public void setDrawingCacheQuality(int quality) { 4524 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4525 } 4526 4527 /** 4528 * Returns whether the screen should remain on, corresponding to the current 4529 * value of {@link #KEEP_SCREEN_ON}. 4530 * 4531 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4532 * 4533 * @see #setKeepScreenOn(boolean) 4534 * 4535 * @attr ref android.R.styleable#View_keepScreenOn 4536 */ 4537 public boolean getKeepScreenOn() { 4538 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4539 } 4540 4541 /** 4542 * Controls whether the screen should remain on, modifying the 4543 * value of {@link #KEEP_SCREEN_ON}. 4544 * 4545 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4546 * 4547 * @see #getKeepScreenOn() 4548 * 4549 * @attr ref android.R.styleable#View_keepScreenOn 4550 */ 4551 public void setKeepScreenOn(boolean keepScreenOn) { 4552 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4553 } 4554 4555 /** 4556 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4557 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4558 * 4559 * @attr ref android.R.styleable#View_nextFocusLeft 4560 */ 4561 public int getNextFocusLeftId() { 4562 return mNextFocusLeftId; 4563 } 4564 4565 /** 4566 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4567 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4568 * decide automatically. 4569 * 4570 * @attr ref android.R.styleable#View_nextFocusLeft 4571 */ 4572 public void setNextFocusLeftId(int nextFocusLeftId) { 4573 mNextFocusLeftId = nextFocusLeftId; 4574 } 4575 4576 /** 4577 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4578 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4579 * 4580 * @attr ref android.R.styleable#View_nextFocusRight 4581 */ 4582 public int getNextFocusRightId() { 4583 return mNextFocusRightId; 4584 } 4585 4586 /** 4587 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4588 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4589 * decide automatically. 4590 * 4591 * @attr ref android.R.styleable#View_nextFocusRight 4592 */ 4593 public void setNextFocusRightId(int nextFocusRightId) { 4594 mNextFocusRightId = nextFocusRightId; 4595 } 4596 4597 /** 4598 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4599 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4600 * 4601 * @attr ref android.R.styleable#View_nextFocusUp 4602 */ 4603 public int getNextFocusUpId() { 4604 return mNextFocusUpId; 4605 } 4606 4607 /** 4608 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4609 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4610 * decide automatically. 4611 * 4612 * @attr ref android.R.styleable#View_nextFocusUp 4613 */ 4614 public void setNextFocusUpId(int nextFocusUpId) { 4615 mNextFocusUpId = nextFocusUpId; 4616 } 4617 4618 /** 4619 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4620 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4621 * 4622 * @attr ref android.R.styleable#View_nextFocusDown 4623 */ 4624 public int getNextFocusDownId() { 4625 return mNextFocusDownId; 4626 } 4627 4628 /** 4629 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4630 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4631 * decide automatically. 4632 * 4633 * @attr ref android.R.styleable#View_nextFocusDown 4634 */ 4635 public void setNextFocusDownId(int nextFocusDownId) { 4636 mNextFocusDownId = nextFocusDownId; 4637 } 4638 4639 /** 4640 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4641 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4642 * 4643 * @attr ref android.R.styleable#View_nextFocusForward 4644 */ 4645 public int getNextFocusForwardId() { 4646 return mNextFocusForwardId; 4647 } 4648 4649 /** 4650 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4651 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4652 * decide automatically. 4653 * 4654 * @attr ref android.R.styleable#View_nextFocusForward 4655 */ 4656 public void setNextFocusForwardId(int nextFocusForwardId) { 4657 mNextFocusForwardId = nextFocusForwardId; 4658 } 4659 4660 /** 4661 * Returns the visibility of this view and all of its ancestors 4662 * 4663 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4664 */ 4665 public boolean isShown() { 4666 View current = this; 4667 //noinspection ConstantConditions 4668 do { 4669 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4670 return false; 4671 } 4672 ViewParent parent = current.mParent; 4673 if (parent == null) { 4674 return false; // We are not attached to the view root 4675 } 4676 if (!(parent instanceof View)) { 4677 return true; 4678 } 4679 current = (View) parent; 4680 } while (current != null); 4681 4682 return false; 4683 } 4684 4685 /** 4686 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4687 * is set 4688 * 4689 * @param insets Insets for system windows 4690 * 4691 * @return True if this view applied the insets, false otherwise 4692 */ 4693 protected boolean fitSystemWindows(Rect insets) { 4694 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4695 mPaddingLeft = insets.left; 4696 mPaddingTop = insets.top; 4697 mPaddingRight = insets.right; 4698 mPaddingBottom = insets.bottom; 4699 requestLayout(); 4700 return true; 4701 } 4702 return false; 4703 } 4704 4705 /** 4706 * Set whether or not this view should account for system screen decorations 4707 * such as the status bar and inset its content. This allows this view to be 4708 * positioned in absolute screen coordinates and remain visible to the user. 4709 * 4710 * <p>This should only be used by top-level window decor views. 4711 * 4712 * @param fitSystemWindows true to inset content for system screen decorations, false for 4713 * default behavior. 4714 * 4715 * @attr ref android.R.styleable#View_fitsSystemWindows 4716 */ 4717 public void setFitsSystemWindows(boolean fitSystemWindows) { 4718 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 4719 } 4720 4721 /** 4722 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 4723 * will account for system screen decorations such as the status bar and inset its 4724 * content. This allows the view to be positioned in absolute screen coordinates 4725 * and remain visible to the user. 4726 * 4727 * @return true if this view will adjust its content bounds for system screen decorations. 4728 * 4729 * @attr ref android.R.styleable#View_fitsSystemWindows 4730 */ 4731 public boolean fitsSystemWindows() { 4732 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 4733 } 4734 4735 /** 4736 * Returns the visibility status for this view. 4737 * 4738 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4739 * @attr ref android.R.styleable#View_visibility 4740 */ 4741 @ViewDebug.ExportedProperty(mapping = { 4742 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4743 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4744 @ViewDebug.IntToString(from = GONE, to = "GONE") 4745 }) 4746 public int getVisibility() { 4747 return mViewFlags & VISIBILITY_MASK; 4748 } 4749 4750 /** 4751 * Set the enabled state of this view. 4752 * 4753 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4754 * @attr ref android.R.styleable#View_visibility 4755 */ 4756 @RemotableViewMethod 4757 public void setVisibility(int visibility) { 4758 setFlags(visibility, VISIBILITY_MASK); 4759 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4760 } 4761 4762 /** 4763 * Returns the enabled status for this view. The interpretation of the 4764 * enabled state varies by subclass. 4765 * 4766 * @return True if this view is enabled, false otherwise. 4767 */ 4768 @ViewDebug.ExportedProperty 4769 public boolean isEnabled() { 4770 return (mViewFlags & ENABLED_MASK) == ENABLED; 4771 } 4772 4773 /** 4774 * Set the enabled state of this view. The interpretation of the enabled 4775 * state varies by subclass. 4776 * 4777 * @param enabled True if this view is enabled, false otherwise. 4778 */ 4779 @RemotableViewMethod 4780 public void setEnabled(boolean enabled) { 4781 if (enabled == isEnabled()) return; 4782 4783 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4784 4785 /* 4786 * The View most likely has to change its appearance, so refresh 4787 * the drawable state. 4788 */ 4789 refreshDrawableState(); 4790 4791 // Invalidate too, since the default behavior for views is to be 4792 // be drawn at 50% alpha rather than to change the drawable. 4793 invalidate(true); 4794 } 4795 4796 /** 4797 * Set whether this view can receive the focus. 4798 * 4799 * Setting this to false will also ensure that this view is not focusable 4800 * in touch mode. 4801 * 4802 * @param focusable If true, this view can receive the focus. 4803 * 4804 * @see #setFocusableInTouchMode(boolean) 4805 * @attr ref android.R.styleable#View_focusable 4806 */ 4807 public void setFocusable(boolean focusable) { 4808 if (!focusable) { 4809 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4810 } 4811 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4812 } 4813 4814 /** 4815 * Set whether this view can receive focus while in touch mode. 4816 * 4817 * Setting this to true will also ensure that this view is focusable. 4818 * 4819 * @param focusableInTouchMode If true, this view can receive the focus while 4820 * in touch mode. 4821 * 4822 * @see #setFocusable(boolean) 4823 * @attr ref android.R.styleable#View_focusableInTouchMode 4824 */ 4825 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4826 // Focusable in touch mode should always be set before the focusable flag 4827 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4828 // which, in touch mode, will not successfully request focus on this view 4829 // because the focusable in touch mode flag is not set 4830 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4831 if (focusableInTouchMode) { 4832 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4833 } 4834 } 4835 4836 /** 4837 * Set whether this view should have sound effects enabled for events such as 4838 * clicking and touching. 4839 * 4840 * <p>You may wish to disable sound effects for a view if you already play sounds, 4841 * for instance, a dial key that plays dtmf tones. 4842 * 4843 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4844 * @see #isSoundEffectsEnabled() 4845 * @see #playSoundEffect(int) 4846 * @attr ref android.R.styleable#View_soundEffectsEnabled 4847 */ 4848 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4849 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4850 } 4851 4852 /** 4853 * @return whether this view should have sound effects enabled for events such as 4854 * clicking and touching. 4855 * 4856 * @see #setSoundEffectsEnabled(boolean) 4857 * @see #playSoundEffect(int) 4858 * @attr ref android.R.styleable#View_soundEffectsEnabled 4859 */ 4860 @ViewDebug.ExportedProperty 4861 public boolean isSoundEffectsEnabled() { 4862 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4863 } 4864 4865 /** 4866 * Set whether this view should have haptic feedback for events such as 4867 * long presses. 4868 * 4869 * <p>You may wish to disable haptic feedback if your view already controls 4870 * its own haptic feedback. 4871 * 4872 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4873 * @see #isHapticFeedbackEnabled() 4874 * @see #performHapticFeedback(int) 4875 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4876 */ 4877 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4878 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4879 } 4880 4881 /** 4882 * @return whether this view should have haptic feedback enabled for events 4883 * long presses. 4884 * 4885 * @see #setHapticFeedbackEnabled(boolean) 4886 * @see #performHapticFeedback(int) 4887 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4888 */ 4889 @ViewDebug.ExportedProperty 4890 public boolean isHapticFeedbackEnabled() { 4891 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4892 } 4893 4894 /** 4895 * Returns the layout direction for this view. 4896 * 4897 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4898 * {@link #LAYOUT_DIRECTION_RTL}, 4899 * {@link #LAYOUT_DIRECTION_INHERIT} or 4900 * {@link #LAYOUT_DIRECTION_LOCALE}. 4901 * @attr ref android.R.styleable#View_layoutDirection 4902 */ 4903 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4904 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4905 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4906 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4907 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4908 }) 4909 public int getLayoutDirection() { 4910 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 4911 } 4912 4913 /** 4914 * Set the layout direction for this view. This will propagate a reset of layout direction 4915 * resolution to the view's children and resolve layout direction for this view. 4916 * 4917 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4918 * {@link #LAYOUT_DIRECTION_RTL}, 4919 * {@link #LAYOUT_DIRECTION_INHERIT} or 4920 * {@link #LAYOUT_DIRECTION_LOCALE}. 4921 * 4922 * @attr ref android.R.styleable#View_layoutDirection 4923 */ 4924 @RemotableViewMethod 4925 public void setLayoutDirection(int layoutDirection) { 4926 if (getLayoutDirection() != layoutDirection) { 4927 // Reset the current layout direction 4928 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 4929 // Reset the current resolved layout direction 4930 resetResolvedLayoutDirection(); 4931 // Set the new layout direction (filtered) and ask for a layout pass 4932 mPrivateFlags2 |= 4933 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 4934 requestLayout(); 4935 } 4936 } 4937 4938 /** 4939 * Returns the resolved layout direction for this view. 4940 * 4941 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4942 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 4943 */ 4944 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4945 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4946 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4947 }) 4948 public int getResolvedLayoutDirection() { 4949 resolveLayoutDirectionIfNeeded(); 4950 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 4951 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4952 } 4953 4954 /** 4955 * Indicates whether or not this view's layout is right-to-left. This is resolved from 4956 * layout attribute and/or the inherited value from the parent 4957 * 4958 * @return true if the layout is right-to-left. 4959 */ 4960 @ViewDebug.ExportedProperty(category = "layout") 4961 public boolean isLayoutRtl() { 4962 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4963 } 4964 4965 /** 4966 * Indicates whether the view is currently tracking transient state that the 4967 * app should not need to concern itself with saving and restoring, but that 4968 * the framework should take special note to preserve when possible. 4969 * 4970 * @return true if the view has transient state 4971 */ 4972 @ViewDebug.ExportedProperty(category = "layout") 4973 public boolean hasTransientState() { 4974 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 4975 } 4976 4977 /** 4978 * Set whether this view is currently tracking transient state that the 4979 * framework should attempt to preserve when possible. 4980 * 4981 * @param hasTransientState true if this view has transient state 4982 */ 4983 public void setHasTransientState(boolean hasTransientState) { 4984 if (hasTransientState() == hasTransientState) return; 4985 4986 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 4987 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 4988 if (mParent != null) { 4989 try { 4990 mParent.childHasTransientStateChanged(this, hasTransientState); 4991 } catch (AbstractMethodError e) { 4992 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 4993 " does not fully implement ViewParent", e); 4994 } 4995 } 4996 } 4997 4998 /** 4999 * If this view doesn't do any drawing on its own, set this flag to 5000 * allow further optimizations. By default, this flag is not set on 5001 * View, but could be set on some View subclasses such as ViewGroup. 5002 * 5003 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5004 * you should clear this flag. 5005 * 5006 * @param willNotDraw whether or not this View draw on its own 5007 */ 5008 public void setWillNotDraw(boolean willNotDraw) { 5009 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5010 } 5011 5012 /** 5013 * Returns whether or not this View draws on its own. 5014 * 5015 * @return true if this view has nothing to draw, false otherwise 5016 */ 5017 @ViewDebug.ExportedProperty(category = "drawing") 5018 public boolean willNotDraw() { 5019 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5020 } 5021 5022 /** 5023 * When a View's drawing cache is enabled, drawing is redirected to an 5024 * offscreen bitmap. Some views, like an ImageView, must be able to 5025 * bypass this mechanism if they already draw a single bitmap, to avoid 5026 * unnecessary usage of the memory. 5027 * 5028 * @param willNotCacheDrawing true if this view does not cache its 5029 * drawing, false otherwise 5030 */ 5031 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5032 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5033 } 5034 5035 /** 5036 * Returns whether or not this View can cache its drawing or not. 5037 * 5038 * @return true if this view does not cache its drawing, false otherwise 5039 */ 5040 @ViewDebug.ExportedProperty(category = "drawing") 5041 public boolean willNotCacheDrawing() { 5042 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5043 } 5044 5045 /** 5046 * Indicates whether this view reacts to click events or not. 5047 * 5048 * @return true if the view is clickable, false otherwise 5049 * 5050 * @see #setClickable(boolean) 5051 * @attr ref android.R.styleable#View_clickable 5052 */ 5053 @ViewDebug.ExportedProperty 5054 public boolean isClickable() { 5055 return (mViewFlags & CLICKABLE) == CLICKABLE; 5056 } 5057 5058 /** 5059 * Enables or disables click events for this view. When a view 5060 * is clickable it will change its state to "pressed" on every click. 5061 * Subclasses should set the view clickable to visually react to 5062 * user's clicks. 5063 * 5064 * @param clickable true to make the view clickable, false otherwise 5065 * 5066 * @see #isClickable() 5067 * @attr ref android.R.styleable#View_clickable 5068 */ 5069 public void setClickable(boolean clickable) { 5070 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5071 } 5072 5073 /** 5074 * Indicates whether this view reacts to long click events or not. 5075 * 5076 * @return true if the view is long clickable, false otherwise 5077 * 5078 * @see #setLongClickable(boolean) 5079 * @attr ref android.R.styleable#View_longClickable 5080 */ 5081 public boolean isLongClickable() { 5082 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5083 } 5084 5085 /** 5086 * Enables or disables long click events for this view. When a view is long 5087 * clickable it reacts to the user holding down the button for a longer 5088 * duration than a tap. This event can either launch the listener or a 5089 * context menu. 5090 * 5091 * @param longClickable true to make the view long clickable, false otherwise 5092 * @see #isLongClickable() 5093 * @attr ref android.R.styleable#View_longClickable 5094 */ 5095 public void setLongClickable(boolean longClickable) { 5096 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5097 } 5098 5099 /** 5100 * Sets the pressed state for this view. 5101 * 5102 * @see #isClickable() 5103 * @see #setClickable(boolean) 5104 * 5105 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5106 * the View's internal state from a previously set "pressed" state. 5107 */ 5108 public void setPressed(boolean pressed) { 5109 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5110 5111 if (pressed) { 5112 mPrivateFlags |= PRESSED; 5113 } else { 5114 mPrivateFlags &= ~PRESSED; 5115 } 5116 5117 if (needsRefresh) { 5118 refreshDrawableState(); 5119 } 5120 dispatchSetPressed(pressed); 5121 } 5122 5123 /** 5124 * Dispatch setPressed to all of this View's children. 5125 * 5126 * @see #setPressed(boolean) 5127 * 5128 * @param pressed The new pressed state 5129 */ 5130 protected void dispatchSetPressed(boolean pressed) { 5131 } 5132 5133 /** 5134 * Indicates whether the view is currently in pressed state. Unless 5135 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5136 * the pressed state. 5137 * 5138 * @see #setPressed(boolean) 5139 * @see #isClickable() 5140 * @see #setClickable(boolean) 5141 * 5142 * @return true if the view is currently pressed, false otherwise 5143 */ 5144 public boolean isPressed() { 5145 return (mPrivateFlags & PRESSED) == PRESSED; 5146 } 5147 5148 /** 5149 * Indicates whether this view will save its state (that is, 5150 * whether its {@link #onSaveInstanceState} method will be called). 5151 * 5152 * @return Returns true if the view state saving is enabled, else false. 5153 * 5154 * @see #setSaveEnabled(boolean) 5155 * @attr ref android.R.styleable#View_saveEnabled 5156 */ 5157 public boolean isSaveEnabled() { 5158 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5159 } 5160 5161 /** 5162 * Controls whether the saving of this view's state is 5163 * enabled (that is, whether its {@link #onSaveInstanceState} method 5164 * will be called). Note that even if freezing is enabled, the 5165 * view still must have an id assigned to it (via {@link #setId(int)}) 5166 * for its state to be saved. This flag can only disable the 5167 * saving of this view; any child views may still have their state saved. 5168 * 5169 * @param enabled Set to false to <em>disable</em> state saving, or true 5170 * (the default) to allow it. 5171 * 5172 * @see #isSaveEnabled() 5173 * @see #setId(int) 5174 * @see #onSaveInstanceState() 5175 * @attr ref android.R.styleable#View_saveEnabled 5176 */ 5177 public void setSaveEnabled(boolean enabled) { 5178 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5179 } 5180 5181 /** 5182 * Gets whether the framework should discard touches when the view's 5183 * window is obscured by another visible window. 5184 * Refer to the {@link View} security documentation for more details. 5185 * 5186 * @return True if touch filtering is enabled. 5187 * 5188 * @see #setFilterTouchesWhenObscured(boolean) 5189 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5190 */ 5191 @ViewDebug.ExportedProperty 5192 public boolean getFilterTouchesWhenObscured() { 5193 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5194 } 5195 5196 /** 5197 * Sets whether the framework should discard touches when the view's 5198 * window is obscured by another visible window. 5199 * Refer to the {@link View} security documentation for more details. 5200 * 5201 * @param enabled True if touch filtering should be enabled. 5202 * 5203 * @see #getFilterTouchesWhenObscured 5204 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5205 */ 5206 public void setFilterTouchesWhenObscured(boolean enabled) { 5207 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5208 FILTER_TOUCHES_WHEN_OBSCURED); 5209 } 5210 5211 /** 5212 * Indicates whether the entire hierarchy under this view will save its 5213 * state when a state saving traversal occurs from its parent. The default 5214 * is true; if false, these views will not be saved unless 5215 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5216 * 5217 * @return Returns true if the view state saving from parent is enabled, else false. 5218 * 5219 * @see #setSaveFromParentEnabled(boolean) 5220 */ 5221 public boolean isSaveFromParentEnabled() { 5222 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5223 } 5224 5225 /** 5226 * Controls whether the entire hierarchy under this view will save its 5227 * state when a state saving traversal occurs from its parent. The default 5228 * is true; if false, these views will not be saved unless 5229 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5230 * 5231 * @param enabled Set to false to <em>disable</em> state saving, or true 5232 * (the default) to allow it. 5233 * 5234 * @see #isSaveFromParentEnabled() 5235 * @see #setId(int) 5236 * @see #onSaveInstanceState() 5237 */ 5238 public void setSaveFromParentEnabled(boolean enabled) { 5239 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5240 } 5241 5242 5243 /** 5244 * Returns whether this View is able to take focus. 5245 * 5246 * @return True if this view can take focus, or false otherwise. 5247 * @attr ref android.R.styleable#View_focusable 5248 */ 5249 @ViewDebug.ExportedProperty(category = "focus") 5250 public final boolean isFocusable() { 5251 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5252 } 5253 5254 /** 5255 * When a view is focusable, it may not want to take focus when in touch mode. 5256 * For example, a button would like focus when the user is navigating via a D-pad 5257 * so that the user can click on it, but once the user starts touching the screen, 5258 * the button shouldn't take focus 5259 * @return Whether the view is focusable in touch mode. 5260 * @attr ref android.R.styleable#View_focusableInTouchMode 5261 */ 5262 @ViewDebug.ExportedProperty 5263 public final boolean isFocusableInTouchMode() { 5264 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5265 } 5266 5267 /** 5268 * Find the nearest view in the specified direction that can take focus. 5269 * This does not actually give focus to that view. 5270 * 5271 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5272 * 5273 * @return The nearest focusable in the specified direction, or null if none 5274 * can be found. 5275 */ 5276 public View focusSearch(int direction) { 5277 if (mParent != null) { 5278 return mParent.focusSearch(this, direction); 5279 } else { 5280 return null; 5281 } 5282 } 5283 5284 /** 5285 * This method is the last chance for the focused view and its ancestors to 5286 * respond to an arrow key. This is called when the focused view did not 5287 * consume the key internally, nor could the view system find a new view in 5288 * the requested direction to give focus to. 5289 * 5290 * @param focused The currently focused view. 5291 * @param direction The direction focus wants to move. One of FOCUS_UP, 5292 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5293 * @return True if the this view consumed this unhandled move. 5294 */ 5295 public boolean dispatchUnhandledMove(View focused, int direction) { 5296 return false; 5297 } 5298 5299 /** 5300 * If a user manually specified the next view id for a particular direction, 5301 * use the root to look up the view. 5302 * @param root The root view of the hierarchy containing this view. 5303 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5304 * or FOCUS_BACKWARD. 5305 * @return The user specified next view, or null if there is none. 5306 */ 5307 View findUserSetNextFocus(View root, int direction) { 5308 switch (direction) { 5309 case FOCUS_LEFT: 5310 if (mNextFocusLeftId == View.NO_ID) return null; 5311 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5312 case FOCUS_RIGHT: 5313 if (mNextFocusRightId == View.NO_ID) return null; 5314 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5315 case FOCUS_UP: 5316 if (mNextFocusUpId == View.NO_ID) return null; 5317 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5318 case FOCUS_DOWN: 5319 if (mNextFocusDownId == View.NO_ID) return null; 5320 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5321 case FOCUS_FORWARD: 5322 if (mNextFocusForwardId == View.NO_ID) return null; 5323 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5324 case FOCUS_BACKWARD: { 5325 if (mID == View.NO_ID) return null; 5326 final int id = mID; 5327 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5328 @Override 5329 public boolean apply(View t) { 5330 return t.mNextFocusForwardId == id; 5331 } 5332 }); 5333 } 5334 } 5335 return null; 5336 } 5337 5338 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5339 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5340 @Override 5341 public boolean apply(View t) { 5342 return t.mID == childViewId; 5343 } 5344 }); 5345 5346 if (result == null) { 5347 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5348 + "by user for id " + childViewId); 5349 } 5350 return result; 5351 } 5352 5353 /** 5354 * Find and return all focusable views that are descendants of this view, 5355 * possibly including this view if it is focusable itself. 5356 * 5357 * @param direction The direction of the focus 5358 * @return A list of focusable views 5359 */ 5360 public ArrayList<View> getFocusables(int direction) { 5361 ArrayList<View> result = new ArrayList<View>(24); 5362 addFocusables(result, direction); 5363 return result; 5364 } 5365 5366 /** 5367 * Add any focusable views that are descendants of this view (possibly 5368 * including this view if it is focusable itself) to views. If we are in touch mode, 5369 * only add views that are also focusable in touch mode. 5370 * 5371 * @param views Focusable views found so far 5372 * @param direction The direction of the focus 5373 */ 5374 public void addFocusables(ArrayList<View> views, int direction) { 5375 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5376 } 5377 5378 /** 5379 * Adds any focusable views that are descendants of this view (possibly 5380 * including this view if it is focusable itself) to views. This method 5381 * adds all focusable views regardless if we are in touch mode or 5382 * only views focusable in touch mode if we are in touch mode depending on 5383 * the focusable mode paramater. 5384 * 5385 * @param views Focusable views found so far or null if all we are interested is 5386 * the number of focusables. 5387 * @param direction The direction of the focus. 5388 * @param focusableMode The type of focusables to be added. 5389 * 5390 * @see #FOCUSABLES_ALL 5391 * @see #FOCUSABLES_TOUCH_MODE 5392 */ 5393 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5394 if (!isFocusable()) { 5395 return; 5396 } 5397 5398 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 5399 isInTouchMode() && !isFocusableInTouchMode()) { 5400 return; 5401 } 5402 5403 if (views != null) { 5404 views.add(this); 5405 } 5406 } 5407 5408 /** 5409 * Finds the Views that contain given text. The containment is case insensitive. 5410 * The search is performed by either the text that the View renders or the content 5411 * description that describes the view for accessibility purposes and the view does 5412 * not render or both. Clients can specify how the search is to be performed via 5413 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5414 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5415 * 5416 * @param outViews The output list of matching Views. 5417 * @param searched The text to match against. 5418 * 5419 * @see #FIND_VIEWS_WITH_TEXT 5420 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 5421 * @see #setContentDescription(CharSequence) 5422 */ 5423 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 5424 if (getAccessibilityNodeProvider() != null) { 5425 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 5426 outViews.add(this); 5427 } 5428 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 5429 && !TextUtils.isEmpty(searched) && !TextUtils.isEmpty(mContentDescription)) { 5430 String searchedLowerCase = searched.toString().toLowerCase(); 5431 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 5432 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 5433 outViews.add(this); 5434 } 5435 } 5436 } 5437 5438 /** 5439 * Find and return all touchable views that are descendants of this view, 5440 * possibly including this view if it is touchable itself. 5441 * 5442 * @return A list of touchable views 5443 */ 5444 public ArrayList<View> getTouchables() { 5445 ArrayList<View> result = new ArrayList<View>(); 5446 addTouchables(result); 5447 return result; 5448 } 5449 5450 /** 5451 * Add any touchable views that are descendants of this view (possibly 5452 * including this view if it is touchable itself) to views. 5453 * 5454 * @param views Touchable views found so far 5455 */ 5456 public void addTouchables(ArrayList<View> views) { 5457 final int viewFlags = mViewFlags; 5458 5459 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5460 && (viewFlags & ENABLED_MASK) == ENABLED) { 5461 views.add(this); 5462 } 5463 } 5464 5465 /** 5466 * Call this to try to give focus to a specific view or to one of its 5467 * descendants. 5468 * 5469 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5470 * false), or if it is focusable and it is not focusable in touch mode 5471 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5472 * 5473 * See also {@link #focusSearch(int)}, which is what you call to say that you 5474 * have focus, and you want your parent to look for the next one. 5475 * 5476 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 5477 * {@link #FOCUS_DOWN} and <code>null</code>. 5478 * 5479 * @return Whether this view or one of its descendants actually took focus. 5480 */ 5481 public final boolean requestFocus() { 5482 return requestFocus(View.FOCUS_DOWN); 5483 } 5484 5485 5486 /** 5487 * Call this to try to give focus to a specific view or to one of its 5488 * descendants and give it a hint about what direction focus is heading. 5489 * 5490 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5491 * false), or if it is focusable and it is not focusable in touch mode 5492 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5493 * 5494 * See also {@link #focusSearch(int)}, which is what you call to say that you 5495 * have focus, and you want your parent to look for the next one. 5496 * 5497 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 5498 * <code>null</code> set for the previously focused rectangle. 5499 * 5500 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5501 * @return Whether this view or one of its descendants actually took focus. 5502 */ 5503 public final boolean requestFocus(int direction) { 5504 return requestFocus(direction, null); 5505 } 5506 5507 /** 5508 * Call this to try to give focus to a specific view or to one of its descendants 5509 * and give it hints about the direction and a specific rectangle that the focus 5510 * is coming from. The rectangle can help give larger views a finer grained hint 5511 * about where focus is coming from, and therefore, where to show selection, or 5512 * forward focus change internally. 5513 * 5514 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5515 * false), or if it is focusable and it is not focusable in touch mode 5516 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5517 * 5518 * A View will not take focus if it is not visible. 5519 * 5520 * A View will not take focus if one of its parents has 5521 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 5522 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 5523 * 5524 * See also {@link #focusSearch(int)}, which is what you call to say that you 5525 * have focus, and you want your parent to look for the next one. 5526 * 5527 * You may wish to override this method if your custom {@link View} has an internal 5528 * {@link View} that it wishes to forward the request to. 5529 * 5530 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5531 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 5532 * to give a finer grained hint about where focus is coming from. May be null 5533 * if there is no hint. 5534 * @return Whether this view or one of its descendants actually took focus. 5535 */ 5536 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 5537 // need to be focusable 5538 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 5539 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5540 return false; 5541 } 5542 5543 // need to be focusable in touch mode if in touch mode 5544 if (isInTouchMode() && 5545 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 5546 return false; 5547 } 5548 5549 // need to not have any parents blocking us 5550 if (hasAncestorThatBlocksDescendantFocus()) { 5551 return false; 5552 } 5553 5554 handleFocusGainInternal(direction, previouslyFocusedRect); 5555 return true; 5556 } 5557 5558 /** 5559 * Call this to try to give focus to a specific view or to one of its descendants. This is a 5560 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 5561 * touch mode to request focus when they are touched. 5562 * 5563 * @return Whether this view or one of its descendants actually took focus. 5564 * 5565 * @see #isInTouchMode() 5566 * 5567 */ 5568 public final boolean requestFocusFromTouch() { 5569 // Leave touch mode if we need to 5570 if (isInTouchMode()) { 5571 ViewRootImpl viewRoot = getViewRootImpl(); 5572 if (viewRoot != null) { 5573 viewRoot.ensureTouchMode(false); 5574 } 5575 } 5576 return requestFocus(View.FOCUS_DOWN); 5577 } 5578 5579 /** 5580 * @return Whether any ancestor of this view blocks descendant focus. 5581 */ 5582 private boolean hasAncestorThatBlocksDescendantFocus() { 5583 ViewParent ancestor = mParent; 5584 while (ancestor instanceof ViewGroup) { 5585 final ViewGroup vgAncestor = (ViewGroup) ancestor; 5586 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 5587 return true; 5588 } else { 5589 ancestor = vgAncestor.getParent(); 5590 } 5591 } 5592 return false; 5593 } 5594 5595 /** 5596 * @hide 5597 */ 5598 public void dispatchStartTemporaryDetach() { 5599 onStartTemporaryDetach(); 5600 } 5601 5602 /** 5603 * This is called when a container is going to temporarily detach a child, with 5604 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 5605 * It will either be followed by {@link #onFinishTemporaryDetach()} or 5606 * {@link #onDetachedFromWindow()} when the container is done. 5607 */ 5608 public void onStartTemporaryDetach() { 5609 removeUnsetPressCallback(); 5610 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 5611 } 5612 5613 /** 5614 * @hide 5615 */ 5616 public void dispatchFinishTemporaryDetach() { 5617 onFinishTemporaryDetach(); 5618 } 5619 5620 /** 5621 * Called after {@link #onStartTemporaryDetach} when the container is done 5622 * changing the view. 5623 */ 5624 public void onFinishTemporaryDetach() { 5625 } 5626 5627 /** 5628 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 5629 * for this view's window. Returns null if the view is not currently attached 5630 * to the window. Normally you will not need to use this directly, but 5631 * just use the standard high-level event callbacks like 5632 * {@link #onKeyDown(int, KeyEvent)}. 5633 */ 5634 public KeyEvent.DispatcherState getKeyDispatcherState() { 5635 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 5636 } 5637 5638 /** 5639 * Dispatch a key event before it is processed by any input method 5640 * associated with the view hierarchy. This can be used to intercept 5641 * key events in special situations before the IME consumes them; a 5642 * typical example would be handling the BACK key to update the application's 5643 * UI instead of allowing the IME to see it and close itself. 5644 * 5645 * @param event The key event to be dispatched. 5646 * @return True if the event was handled, false otherwise. 5647 */ 5648 public boolean dispatchKeyEventPreIme(KeyEvent event) { 5649 return onKeyPreIme(event.getKeyCode(), event); 5650 } 5651 5652 /** 5653 * Dispatch a key event to the next view on the focus path. This path runs 5654 * from the top of the view tree down to the currently focused view. If this 5655 * view has focus, it will dispatch to itself. Otherwise it will dispatch 5656 * the next node down the focus path. This method also fires any key 5657 * listeners. 5658 * 5659 * @param event The key event to be dispatched. 5660 * @return True if the event was handled, false otherwise. 5661 */ 5662 public boolean dispatchKeyEvent(KeyEvent event) { 5663 if (mInputEventConsistencyVerifier != null) { 5664 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 5665 } 5666 5667 // Give any attached key listener a first crack at the event. 5668 //noinspection SimplifiableIfStatement 5669 ListenerInfo li = mListenerInfo; 5670 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5671 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 5672 return true; 5673 } 5674 5675 if (event.dispatch(this, mAttachInfo != null 5676 ? mAttachInfo.mKeyDispatchState : null, this)) { 5677 return true; 5678 } 5679 5680 if (mInputEventConsistencyVerifier != null) { 5681 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5682 } 5683 return false; 5684 } 5685 5686 /** 5687 * Dispatches a key shortcut event. 5688 * 5689 * @param event The key event to be dispatched. 5690 * @return True if the event was handled by the view, false otherwise. 5691 */ 5692 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5693 return onKeyShortcut(event.getKeyCode(), event); 5694 } 5695 5696 /** 5697 * Pass the touch screen motion event down to the target view, or this 5698 * view if it is the target. 5699 * 5700 * @param event The motion event to be dispatched. 5701 * @return True if the event was handled by the view, false otherwise. 5702 */ 5703 public boolean dispatchTouchEvent(MotionEvent event) { 5704 if (mInputEventConsistencyVerifier != null) { 5705 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5706 } 5707 5708 if (onFilterTouchEventForSecurity(event)) { 5709 //noinspection SimplifiableIfStatement 5710 ListenerInfo li = mListenerInfo; 5711 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5712 && li.mOnTouchListener.onTouch(this, event)) { 5713 return true; 5714 } 5715 5716 if (onTouchEvent(event)) { 5717 return true; 5718 } 5719 } 5720 5721 if (mInputEventConsistencyVerifier != null) { 5722 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5723 } 5724 return false; 5725 } 5726 5727 /** 5728 * Filter the touch event to apply security policies. 5729 * 5730 * @param event The motion event to be filtered. 5731 * @return True if the event should be dispatched, false if the event should be dropped. 5732 * 5733 * @see #getFilterTouchesWhenObscured 5734 */ 5735 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5736 //noinspection RedundantIfStatement 5737 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5738 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5739 // Window is obscured, drop this touch. 5740 return false; 5741 } 5742 return true; 5743 } 5744 5745 /** 5746 * Pass a trackball motion event down to the focused view. 5747 * 5748 * @param event The motion event to be dispatched. 5749 * @return True if the event was handled by the view, false otherwise. 5750 */ 5751 public boolean dispatchTrackballEvent(MotionEvent event) { 5752 if (mInputEventConsistencyVerifier != null) { 5753 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5754 } 5755 5756 return onTrackballEvent(event); 5757 } 5758 5759 /** 5760 * Dispatch a generic motion event. 5761 * <p> 5762 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5763 * are delivered to the view under the pointer. All other generic motion events are 5764 * delivered to the focused view. Hover events are handled specially and are delivered 5765 * to {@link #onHoverEvent(MotionEvent)}. 5766 * </p> 5767 * 5768 * @param event The motion event to be dispatched. 5769 * @return True if the event was handled by the view, false otherwise. 5770 */ 5771 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5772 if (mInputEventConsistencyVerifier != null) { 5773 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5774 } 5775 5776 final int source = event.getSource(); 5777 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5778 final int action = event.getAction(); 5779 if (action == MotionEvent.ACTION_HOVER_ENTER 5780 || action == MotionEvent.ACTION_HOVER_MOVE 5781 || action == MotionEvent.ACTION_HOVER_EXIT) { 5782 if (dispatchHoverEvent(event)) { 5783 return true; 5784 } 5785 } else if (dispatchGenericPointerEvent(event)) { 5786 return true; 5787 } 5788 } else if (dispatchGenericFocusedEvent(event)) { 5789 return true; 5790 } 5791 5792 if (dispatchGenericMotionEventInternal(event)) { 5793 return true; 5794 } 5795 5796 if (mInputEventConsistencyVerifier != null) { 5797 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5798 } 5799 return false; 5800 } 5801 5802 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 5803 //noinspection SimplifiableIfStatement 5804 ListenerInfo li = mListenerInfo; 5805 if (li != null && li.mOnGenericMotionListener != null 5806 && (mViewFlags & ENABLED_MASK) == ENABLED 5807 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 5808 return true; 5809 } 5810 5811 if (onGenericMotionEvent(event)) { 5812 return true; 5813 } 5814 5815 if (mInputEventConsistencyVerifier != null) { 5816 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5817 } 5818 return false; 5819 } 5820 5821 /** 5822 * Dispatch a hover event. 5823 * <p> 5824 * Do not call this method directly. 5825 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5826 * </p> 5827 * 5828 * @param event The motion event to be dispatched. 5829 * @return True if the event was handled by the view, false otherwise. 5830 */ 5831 protected boolean dispatchHoverEvent(MotionEvent event) { 5832 //noinspection SimplifiableIfStatement 5833 ListenerInfo li = mListenerInfo; 5834 if (li != null && li.mOnHoverListener != null 5835 && (mViewFlags & ENABLED_MASK) == ENABLED 5836 && li.mOnHoverListener.onHover(this, event)) { 5837 return true; 5838 } 5839 5840 return onHoverEvent(event); 5841 } 5842 5843 /** 5844 * Returns true if the view has a child to which it has recently sent 5845 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 5846 * it does not have a hovered child, then it must be the innermost hovered view. 5847 * @hide 5848 */ 5849 protected boolean hasHoveredChild() { 5850 return false; 5851 } 5852 5853 /** 5854 * Dispatch a generic motion event to the view under the first pointer. 5855 * <p> 5856 * Do not call this method directly. 5857 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5858 * </p> 5859 * 5860 * @param event The motion event to be dispatched. 5861 * @return True if the event was handled by the view, false otherwise. 5862 */ 5863 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5864 return false; 5865 } 5866 5867 /** 5868 * Dispatch a generic motion event to the currently focused view. 5869 * <p> 5870 * Do not call this method directly. 5871 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5872 * </p> 5873 * 5874 * @param event The motion event to be dispatched. 5875 * @return True if the event was handled by the view, false otherwise. 5876 */ 5877 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5878 return false; 5879 } 5880 5881 /** 5882 * Dispatch a pointer event. 5883 * <p> 5884 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5885 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5886 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5887 * and should not be expected to handle other pointing device features. 5888 * </p> 5889 * 5890 * @param event The motion event to be dispatched. 5891 * @return True if the event was handled by the view, false otherwise. 5892 * @hide 5893 */ 5894 public final boolean dispatchPointerEvent(MotionEvent event) { 5895 if (event.isTouchEvent()) { 5896 return dispatchTouchEvent(event); 5897 } else { 5898 return dispatchGenericMotionEvent(event); 5899 } 5900 } 5901 5902 /** 5903 * Called when the window containing this view gains or loses window focus. 5904 * ViewGroups should override to route to their children. 5905 * 5906 * @param hasFocus True if the window containing this view now has focus, 5907 * false otherwise. 5908 */ 5909 public void dispatchWindowFocusChanged(boolean hasFocus) { 5910 onWindowFocusChanged(hasFocus); 5911 } 5912 5913 /** 5914 * Called when the window containing this view gains or loses focus. Note 5915 * that this is separate from view focus: to receive key events, both 5916 * your view and its window must have focus. If a window is displayed 5917 * on top of yours that takes input focus, then your own window will lose 5918 * focus but the view focus will remain unchanged. 5919 * 5920 * @param hasWindowFocus True if the window containing this view now has 5921 * focus, false otherwise. 5922 */ 5923 public void onWindowFocusChanged(boolean hasWindowFocus) { 5924 InputMethodManager imm = InputMethodManager.peekInstance(); 5925 if (!hasWindowFocus) { 5926 if (isPressed()) { 5927 setPressed(false); 5928 } 5929 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5930 imm.focusOut(this); 5931 } 5932 removeLongPressCallback(); 5933 removeTapCallback(); 5934 onFocusLost(); 5935 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5936 imm.focusIn(this); 5937 } 5938 refreshDrawableState(); 5939 } 5940 5941 /** 5942 * Returns true if this view is in a window that currently has window focus. 5943 * Note that this is not the same as the view itself having focus. 5944 * 5945 * @return True if this view is in a window that currently has window focus. 5946 */ 5947 public boolean hasWindowFocus() { 5948 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5949 } 5950 5951 /** 5952 * Dispatch a view visibility change down the view hierarchy. 5953 * ViewGroups should override to route to their children. 5954 * @param changedView The view whose visibility changed. Could be 'this' or 5955 * an ancestor view. 5956 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5957 * {@link #INVISIBLE} or {@link #GONE}. 5958 */ 5959 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5960 onVisibilityChanged(changedView, visibility); 5961 } 5962 5963 /** 5964 * Called when the visibility of the view or an ancestor of the view is changed. 5965 * @param changedView The view whose visibility changed. Could be 'this' or 5966 * an ancestor view. 5967 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5968 * {@link #INVISIBLE} or {@link #GONE}. 5969 */ 5970 protected void onVisibilityChanged(View changedView, int visibility) { 5971 if (visibility == VISIBLE) { 5972 if (mAttachInfo != null) { 5973 initialAwakenScrollBars(); 5974 } else { 5975 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5976 } 5977 } 5978 } 5979 5980 /** 5981 * Dispatch a hint about whether this view is displayed. For instance, when 5982 * a View moves out of the screen, it might receives a display hint indicating 5983 * the view is not displayed. Applications should not <em>rely</em> on this hint 5984 * as there is no guarantee that they will receive one. 5985 * 5986 * @param hint A hint about whether or not this view is displayed: 5987 * {@link #VISIBLE} or {@link #INVISIBLE}. 5988 */ 5989 public void dispatchDisplayHint(int hint) { 5990 onDisplayHint(hint); 5991 } 5992 5993 /** 5994 * Gives this view a hint about whether is displayed or not. For instance, when 5995 * a View moves out of the screen, it might receives a display hint indicating 5996 * the view is not displayed. Applications should not <em>rely</em> on this hint 5997 * as there is no guarantee that they will receive one. 5998 * 5999 * @param hint A hint about whether or not this view is displayed: 6000 * {@link #VISIBLE} or {@link #INVISIBLE}. 6001 */ 6002 protected void onDisplayHint(int hint) { 6003 } 6004 6005 /** 6006 * Dispatch a window visibility change down the view hierarchy. 6007 * ViewGroups should override to route to their children. 6008 * 6009 * @param visibility The new visibility of the window. 6010 * 6011 * @see #onWindowVisibilityChanged(int) 6012 */ 6013 public void dispatchWindowVisibilityChanged(int visibility) { 6014 onWindowVisibilityChanged(visibility); 6015 } 6016 6017 /** 6018 * Called when the window containing has change its visibility 6019 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 6020 * that this tells you whether or not your window is being made visible 6021 * to the window manager; this does <em>not</em> tell you whether or not 6022 * your window is obscured by other windows on the screen, even if it 6023 * is itself visible. 6024 * 6025 * @param visibility The new visibility of the window. 6026 */ 6027 protected void onWindowVisibilityChanged(int visibility) { 6028 if (visibility == VISIBLE) { 6029 initialAwakenScrollBars(); 6030 } 6031 } 6032 6033 /** 6034 * Returns the current visibility of the window this view is attached to 6035 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 6036 * 6037 * @return Returns the current visibility of the view's window. 6038 */ 6039 public int getWindowVisibility() { 6040 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 6041 } 6042 6043 /** 6044 * Retrieve the overall visible display size in which the window this view is 6045 * attached to has been positioned in. This takes into account screen 6046 * decorations above the window, for both cases where the window itself 6047 * is being position inside of them or the window is being placed under 6048 * then and covered insets are used for the window to position its content 6049 * inside. In effect, this tells you the available area where content can 6050 * be placed and remain visible to users. 6051 * 6052 * <p>This function requires an IPC back to the window manager to retrieve 6053 * the requested information, so should not be used in performance critical 6054 * code like drawing. 6055 * 6056 * @param outRect Filled in with the visible display frame. If the view 6057 * is not attached to a window, this is simply the raw display size. 6058 */ 6059 public void getWindowVisibleDisplayFrame(Rect outRect) { 6060 if (mAttachInfo != null) { 6061 try { 6062 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 6063 } catch (RemoteException e) { 6064 return; 6065 } 6066 // XXX This is really broken, and probably all needs to be done 6067 // in the window manager, and we need to know more about whether 6068 // we want the area behind or in front of the IME. 6069 final Rect insets = mAttachInfo.mVisibleInsets; 6070 outRect.left += insets.left; 6071 outRect.top += insets.top; 6072 outRect.right -= insets.right; 6073 outRect.bottom -= insets.bottom; 6074 return; 6075 } 6076 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 6077 d.getRectSize(outRect); 6078 } 6079 6080 /** 6081 * Dispatch a notification about a resource configuration change down 6082 * the view hierarchy. 6083 * ViewGroups should override to route to their children. 6084 * 6085 * @param newConfig The new resource configuration. 6086 * 6087 * @see #onConfigurationChanged(android.content.res.Configuration) 6088 */ 6089 public void dispatchConfigurationChanged(Configuration newConfig) { 6090 onConfigurationChanged(newConfig); 6091 } 6092 6093 /** 6094 * Called when the current configuration of the resources being used 6095 * by the application have changed. You can use this to decide when 6096 * to reload resources that can changed based on orientation and other 6097 * configuration characterstics. You only need to use this if you are 6098 * not relying on the normal {@link android.app.Activity} mechanism of 6099 * recreating the activity instance upon a configuration change. 6100 * 6101 * @param newConfig The new resource configuration. 6102 */ 6103 protected void onConfigurationChanged(Configuration newConfig) { 6104 } 6105 6106 /** 6107 * Private function to aggregate all per-view attributes in to the view 6108 * root. 6109 */ 6110 void dispatchCollectViewAttributes(int visibility) { 6111 performCollectViewAttributes(visibility); 6112 } 6113 6114 void performCollectViewAttributes(int visibility) { 6115 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 6116 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 6117 mAttachInfo.mKeepScreenOn = true; 6118 } 6119 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 6120 ListenerInfo li = mListenerInfo; 6121 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 6122 mAttachInfo.mHasSystemUiListeners = true; 6123 } 6124 } 6125 } 6126 6127 void needGlobalAttributesUpdate(boolean force) { 6128 final AttachInfo ai = mAttachInfo; 6129 if (ai != null) { 6130 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 6131 || ai.mHasSystemUiListeners) { 6132 ai.mRecomputeGlobalAttributes = true; 6133 } 6134 } 6135 } 6136 6137 /** 6138 * Returns whether the device is currently in touch mode. Touch mode is entered 6139 * once the user begins interacting with the device by touch, and affects various 6140 * things like whether focus is always visible to the user. 6141 * 6142 * @return Whether the device is in touch mode. 6143 */ 6144 @ViewDebug.ExportedProperty 6145 public boolean isInTouchMode() { 6146 if (mAttachInfo != null) { 6147 return mAttachInfo.mInTouchMode; 6148 } else { 6149 return ViewRootImpl.isInTouchMode(); 6150 } 6151 } 6152 6153 /** 6154 * Returns the context the view is running in, through which it can 6155 * access the current theme, resources, etc. 6156 * 6157 * @return The view's Context. 6158 */ 6159 @ViewDebug.CapturedViewProperty 6160 public final Context getContext() { 6161 return mContext; 6162 } 6163 6164 /** 6165 * Handle a key event before it is processed by any input method 6166 * associated with the view hierarchy. This can be used to intercept 6167 * key events in special situations before the IME consumes them; a 6168 * typical example would be handling the BACK key to update the application's 6169 * UI instead of allowing the IME to see it and close itself. 6170 * 6171 * @param keyCode The value in event.getKeyCode(). 6172 * @param event Description of the key event. 6173 * @return If you handled the event, return true. If you want to allow the 6174 * event to be handled by the next receiver, return false. 6175 */ 6176 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 6177 return false; 6178 } 6179 6180 /** 6181 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 6182 * KeyEvent.Callback.onKeyDown()}: perform press of the view 6183 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 6184 * is released, if the view is enabled and clickable. 6185 * 6186 * @param keyCode A key code that represents the button pressed, from 6187 * {@link android.view.KeyEvent}. 6188 * @param event The KeyEvent object that defines the button action. 6189 */ 6190 public boolean onKeyDown(int keyCode, KeyEvent event) { 6191 boolean result = false; 6192 6193 switch (keyCode) { 6194 case KeyEvent.KEYCODE_DPAD_CENTER: 6195 case KeyEvent.KEYCODE_ENTER: { 6196 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6197 return true; 6198 } 6199 // Long clickable items don't necessarily have to be clickable 6200 if (((mViewFlags & CLICKABLE) == CLICKABLE || 6201 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 6202 (event.getRepeatCount() == 0)) { 6203 setPressed(true); 6204 checkForLongClick(0); 6205 return true; 6206 } 6207 break; 6208 } 6209 } 6210 return result; 6211 } 6212 6213 /** 6214 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 6215 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 6216 * the event). 6217 */ 6218 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 6219 return false; 6220 } 6221 6222 /** 6223 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 6224 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 6225 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 6226 * {@link KeyEvent#KEYCODE_ENTER} is released. 6227 * 6228 * @param keyCode A key code that represents the button pressed, from 6229 * {@link android.view.KeyEvent}. 6230 * @param event The KeyEvent object that defines the button action. 6231 */ 6232 public boolean onKeyUp(int keyCode, KeyEvent event) { 6233 boolean result = false; 6234 6235 switch (keyCode) { 6236 case KeyEvent.KEYCODE_DPAD_CENTER: 6237 case KeyEvent.KEYCODE_ENTER: { 6238 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 6239 return true; 6240 } 6241 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 6242 setPressed(false); 6243 6244 if (!mHasPerformedLongPress) { 6245 // This is a tap, so remove the longpress check 6246 removeLongPressCallback(); 6247 6248 result = performClick(); 6249 } 6250 } 6251 break; 6252 } 6253 } 6254 return result; 6255 } 6256 6257 /** 6258 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 6259 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 6260 * the event). 6261 * 6262 * @param keyCode A key code that represents the button pressed, from 6263 * {@link android.view.KeyEvent}. 6264 * @param repeatCount The number of times the action was made. 6265 * @param event The KeyEvent object that defines the button action. 6266 */ 6267 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 6268 return false; 6269 } 6270 6271 /** 6272 * Called on the focused view when a key shortcut event is not handled. 6273 * Override this method to implement local key shortcuts for the View. 6274 * Key shortcuts can also be implemented by setting the 6275 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 6276 * 6277 * @param keyCode The value in event.getKeyCode(). 6278 * @param event Description of the key event. 6279 * @return If you handled the event, return true. If you want to allow the 6280 * event to be handled by the next receiver, return false. 6281 */ 6282 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 6283 return false; 6284 } 6285 6286 /** 6287 * Check whether the called view is a text editor, in which case it 6288 * would make sense to automatically display a soft input window for 6289 * it. Subclasses should override this if they implement 6290 * {@link #onCreateInputConnection(EditorInfo)} to return true if 6291 * a call on that method would return a non-null InputConnection, and 6292 * they are really a first-class editor that the user would normally 6293 * start typing on when the go into a window containing your view. 6294 * 6295 * <p>The default implementation always returns false. This does 6296 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 6297 * will not be called or the user can not otherwise perform edits on your 6298 * view; it is just a hint to the system that this is not the primary 6299 * purpose of this view. 6300 * 6301 * @return Returns true if this view is a text editor, else false. 6302 */ 6303 public boolean onCheckIsTextEditor() { 6304 return false; 6305 } 6306 6307 /** 6308 * Create a new InputConnection for an InputMethod to interact 6309 * with the view. The default implementation returns null, since it doesn't 6310 * support input methods. You can override this to implement such support. 6311 * This is only needed for views that take focus and text input. 6312 * 6313 * <p>When implementing this, you probably also want to implement 6314 * {@link #onCheckIsTextEditor()} to indicate you will return a 6315 * non-null InputConnection. 6316 * 6317 * @param outAttrs Fill in with attribute information about the connection. 6318 */ 6319 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 6320 return null; 6321 } 6322 6323 /** 6324 * Called by the {@link android.view.inputmethod.InputMethodManager} 6325 * when a view who is not the current 6326 * input connection target is trying to make a call on the manager. The 6327 * default implementation returns false; you can override this to return 6328 * true for certain views if you are performing InputConnection proxying 6329 * to them. 6330 * @param view The View that is making the InputMethodManager call. 6331 * @return Return true to allow the call, false to reject. 6332 */ 6333 public boolean checkInputConnectionProxy(View view) { 6334 return false; 6335 } 6336 6337 /** 6338 * Show the context menu for this view. It is not safe to hold on to the 6339 * menu after returning from this method. 6340 * 6341 * You should normally not overload this method. Overload 6342 * {@link #onCreateContextMenu(ContextMenu)} or define an 6343 * {@link OnCreateContextMenuListener} to add items to the context menu. 6344 * 6345 * @param menu The context menu to populate 6346 */ 6347 public void createContextMenu(ContextMenu menu) { 6348 ContextMenuInfo menuInfo = getContextMenuInfo(); 6349 6350 // Sets the current menu info so all items added to menu will have 6351 // my extra info set. 6352 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 6353 6354 onCreateContextMenu(menu); 6355 ListenerInfo li = mListenerInfo; 6356 if (li != null && li.mOnCreateContextMenuListener != null) { 6357 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 6358 } 6359 6360 // Clear the extra information so subsequent items that aren't mine don't 6361 // have my extra info. 6362 ((MenuBuilder)menu).setCurrentMenuInfo(null); 6363 6364 if (mParent != null) { 6365 mParent.createContextMenu(menu); 6366 } 6367 } 6368 6369 /** 6370 * Views should implement this if they have extra information to associate 6371 * with the context menu. The return result is supplied as a parameter to 6372 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 6373 * callback. 6374 * 6375 * @return Extra information about the item for which the context menu 6376 * should be shown. This information will vary across different 6377 * subclasses of View. 6378 */ 6379 protected ContextMenuInfo getContextMenuInfo() { 6380 return null; 6381 } 6382 6383 /** 6384 * Views should implement this if the view itself is going to add items to 6385 * the context menu. 6386 * 6387 * @param menu the context menu to populate 6388 */ 6389 protected void onCreateContextMenu(ContextMenu menu) { 6390 } 6391 6392 /** 6393 * Implement this method to handle trackball motion events. The 6394 * <em>relative</em> movement of the trackball since the last event 6395 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 6396 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 6397 * that a movement of 1 corresponds to the user pressing one DPAD key (so 6398 * they will often be fractional values, representing the more fine-grained 6399 * movement information available from a trackball). 6400 * 6401 * @param event The motion event. 6402 * @return True if the event was handled, false otherwise. 6403 */ 6404 public boolean onTrackballEvent(MotionEvent event) { 6405 return false; 6406 } 6407 6408 /** 6409 * Implement this method to handle generic motion events. 6410 * <p> 6411 * Generic motion events describe joystick movements, mouse hovers, track pad 6412 * touches, scroll wheel movements and other input events. The 6413 * {@link MotionEvent#getSource() source} of the motion event specifies 6414 * the class of input that was received. Implementations of this method 6415 * must examine the bits in the source before processing the event. 6416 * The following code example shows how this is done. 6417 * </p><p> 6418 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6419 * are delivered to the view under the pointer. All other generic motion events are 6420 * delivered to the focused view. 6421 * </p> 6422 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 6423 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 6424 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 6425 * // process the joystick movement... 6426 * return true; 6427 * } 6428 * } 6429 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6430 * switch (event.getAction()) { 6431 * case MotionEvent.ACTION_HOVER_MOVE: 6432 * // process the mouse hover movement... 6433 * return true; 6434 * case MotionEvent.ACTION_SCROLL: 6435 * // process the scroll wheel movement... 6436 * return true; 6437 * } 6438 * } 6439 * return super.onGenericMotionEvent(event); 6440 * }</pre> 6441 * 6442 * @param event The generic motion event being processed. 6443 * @return True if the event was handled, false otherwise. 6444 */ 6445 public boolean onGenericMotionEvent(MotionEvent event) { 6446 return false; 6447 } 6448 6449 /** 6450 * Implement this method to handle hover events. 6451 * <p> 6452 * This method is called whenever a pointer is hovering into, over, or out of the 6453 * bounds of a view and the view is not currently being touched. 6454 * Hover events are represented as pointer events with action 6455 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 6456 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 6457 * </p> 6458 * <ul> 6459 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 6460 * when the pointer enters the bounds of the view.</li> 6461 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 6462 * when the pointer has already entered the bounds of the view and has moved.</li> 6463 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 6464 * when the pointer has exited the bounds of the view or when the pointer is 6465 * about to go down due to a button click, tap, or similar user action that 6466 * causes the view to be touched.</li> 6467 * </ul> 6468 * <p> 6469 * The view should implement this method to return true to indicate that it is 6470 * handling the hover event, such as by changing its drawable state. 6471 * </p><p> 6472 * The default implementation calls {@link #setHovered} to update the hovered state 6473 * of the view when a hover enter or hover exit event is received, if the view 6474 * is enabled and is clickable. The default implementation also sends hover 6475 * accessibility events. 6476 * </p> 6477 * 6478 * @param event The motion event that describes the hover. 6479 * @return True if the view handled the hover event. 6480 * 6481 * @see #isHovered 6482 * @see #setHovered 6483 * @see #onHoverChanged 6484 */ 6485 public boolean onHoverEvent(MotionEvent event) { 6486 // The root view may receive hover (or touch) events that are outside the bounds of 6487 // the window. This code ensures that we only send accessibility events for 6488 // hovers that are actually within the bounds of the root view. 6489 final int action = event.getAction(); 6490 if (!mSendingHoverAccessibilityEvents) { 6491 if ((action == MotionEvent.ACTION_HOVER_ENTER 6492 || action == MotionEvent.ACTION_HOVER_MOVE) 6493 && !hasHoveredChild() 6494 && pointInView(event.getX(), event.getY())) { 6495 mSendingHoverAccessibilityEvents = true; 6496 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 6497 } 6498 } else { 6499 if (action == MotionEvent.ACTION_HOVER_EXIT 6500 || (action == MotionEvent.ACTION_HOVER_MOVE 6501 && !pointInView(event.getX(), event.getY()))) { 6502 mSendingHoverAccessibilityEvents = false; 6503 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 6504 } 6505 } 6506 6507 if (isHoverable()) { 6508 switch (action) { 6509 case MotionEvent.ACTION_HOVER_ENTER: 6510 setHovered(true); 6511 break; 6512 case MotionEvent.ACTION_HOVER_EXIT: 6513 setHovered(false); 6514 break; 6515 } 6516 6517 // Dispatch the event to onGenericMotionEvent before returning true. 6518 // This is to provide compatibility with existing applications that 6519 // handled HOVER_MOVE events in onGenericMotionEvent and that would 6520 // break because of the new default handling for hoverable views 6521 // in onHoverEvent. 6522 // Note that onGenericMotionEvent will be called by default when 6523 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 6524 dispatchGenericMotionEventInternal(event); 6525 return true; 6526 } 6527 return false; 6528 } 6529 6530 /** 6531 * Returns true if the view should handle {@link #onHoverEvent} 6532 * by calling {@link #setHovered} to change its hovered state. 6533 * 6534 * @return True if the view is hoverable. 6535 */ 6536 private boolean isHoverable() { 6537 final int viewFlags = mViewFlags; 6538 //noinspection SimplifiableIfStatement 6539 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6540 return false; 6541 } 6542 6543 return (viewFlags & CLICKABLE) == CLICKABLE 6544 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6545 } 6546 6547 /** 6548 * Returns true if the view is currently hovered. 6549 * 6550 * @return True if the view is currently hovered. 6551 * 6552 * @see #setHovered 6553 * @see #onHoverChanged 6554 */ 6555 @ViewDebug.ExportedProperty 6556 public boolean isHovered() { 6557 return (mPrivateFlags & HOVERED) != 0; 6558 } 6559 6560 /** 6561 * Sets whether the view is currently hovered. 6562 * <p> 6563 * Calling this method also changes the drawable state of the view. This 6564 * enables the view to react to hover by using different drawable resources 6565 * to change its appearance. 6566 * </p><p> 6567 * The {@link #onHoverChanged} method is called when the hovered state changes. 6568 * </p> 6569 * 6570 * @param hovered True if the view is hovered. 6571 * 6572 * @see #isHovered 6573 * @see #onHoverChanged 6574 */ 6575 public void setHovered(boolean hovered) { 6576 if (hovered) { 6577 if ((mPrivateFlags & HOVERED) == 0) { 6578 mPrivateFlags |= HOVERED; 6579 refreshDrawableState(); 6580 onHoverChanged(true); 6581 } 6582 } else { 6583 if ((mPrivateFlags & HOVERED) != 0) { 6584 mPrivateFlags &= ~HOVERED; 6585 refreshDrawableState(); 6586 onHoverChanged(false); 6587 } 6588 } 6589 } 6590 6591 /** 6592 * Implement this method to handle hover state changes. 6593 * <p> 6594 * This method is called whenever the hover state changes as a result of a 6595 * call to {@link #setHovered}. 6596 * </p> 6597 * 6598 * @param hovered The current hover state, as returned by {@link #isHovered}. 6599 * 6600 * @see #isHovered 6601 * @see #setHovered 6602 */ 6603 public void onHoverChanged(boolean hovered) { 6604 } 6605 6606 /** 6607 * Implement this method to handle touch screen motion events. 6608 * 6609 * @param event The motion event. 6610 * @return True if the event was handled, false otherwise. 6611 */ 6612 public boolean onTouchEvent(MotionEvent event) { 6613 final int viewFlags = mViewFlags; 6614 6615 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6616 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 6617 setPressed(false); 6618 } 6619 // A disabled view that is clickable still consumes the touch 6620 // events, it just doesn't respond to them. 6621 return (((viewFlags & CLICKABLE) == CLICKABLE || 6622 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 6623 } 6624 6625 if (mTouchDelegate != null) { 6626 if (mTouchDelegate.onTouchEvent(event)) { 6627 return true; 6628 } 6629 } 6630 6631 if (((viewFlags & CLICKABLE) == CLICKABLE || 6632 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 6633 switch (event.getAction()) { 6634 case MotionEvent.ACTION_UP: 6635 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 6636 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 6637 // take focus if we don't have it already and we should in 6638 // touch mode. 6639 boolean focusTaken = false; 6640 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 6641 focusTaken = requestFocus(); 6642 } 6643 6644 if (prepressed) { 6645 // The button is being released before we actually 6646 // showed it as pressed. Make it show the pressed 6647 // state now (before scheduling the click) to ensure 6648 // the user sees it. 6649 setPressed(true); 6650 } 6651 6652 if (!mHasPerformedLongPress) { 6653 // This is a tap, so remove the longpress check 6654 removeLongPressCallback(); 6655 6656 // Only perform take click actions if we were in the pressed state 6657 if (!focusTaken) { 6658 // Use a Runnable and post this rather than calling 6659 // performClick directly. This lets other visual state 6660 // of the view update before click actions start. 6661 if (mPerformClick == null) { 6662 mPerformClick = new PerformClick(); 6663 } 6664 if (!post(mPerformClick)) { 6665 performClick(); 6666 } 6667 } 6668 } 6669 6670 if (mUnsetPressedState == null) { 6671 mUnsetPressedState = new UnsetPressedState(); 6672 } 6673 6674 if (prepressed) { 6675 postDelayed(mUnsetPressedState, 6676 ViewConfiguration.getPressedStateDuration()); 6677 } else if (!post(mUnsetPressedState)) { 6678 // If the post failed, unpress right now 6679 mUnsetPressedState.run(); 6680 } 6681 removeTapCallback(); 6682 } 6683 break; 6684 6685 case MotionEvent.ACTION_DOWN: 6686 mHasPerformedLongPress = false; 6687 6688 if (performButtonActionOnTouchDown(event)) { 6689 break; 6690 } 6691 6692 // Walk up the hierarchy to determine if we're inside a scrolling container. 6693 boolean isInScrollingContainer = isInScrollingContainer(); 6694 6695 // For views inside a scrolling container, delay the pressed feedback for 6696 // a short period in case this is a scroll. 6697 if (isInScrollingContainer) { 6698 mPrivateFlags |= PREPRESSED; 6699 if (mPendingCheckForTap == null) { 6700 mPendingCheckForTap = new CheckForTap(); 6701 } 6702 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 6703 } else { 6704 // Not inside a scrolling container, so show the feedback right away 6705 setPressed(true); 6706 checkForLongClick(0); 6707 } 6708 break; 6709 6710 case MotionEvent.ACTION_CANCEL: 6711 setPressed(false); 6712 removeTapCallback(); 6713 break; 6714 6715 case MotionEvent.ACTION_MOVE: 6716 final int x = (int) event.getX(); 6717 final int y = (int) event.getY(); 6718 6719 // Be lenient about moving outside of buttons 6720 if (!pointInView(x, y, mTouchSlop)) { 6721 // Outside button 6722 removeTapCallback(); 6723 if ((mPrivateFlags & PRESSED) != 0) { 6724 // Remove any future long press/tap checks 6725 removeLongPressCallback(); 6726 6727 setPressed(false); 6728 } 6729 } 6730 break; 6731 } 6732 return true; 6733 } 6734 6735 return false; 6736 } 6737 6738 /** 6739 * @hide 6740 */ 6741 public boolean isInScrollingContainer() { 6742 ViewParent p = getParent(); 6743 while (p != null && p instanceof ViewGroup) { 6744 if (((ViewGroup) p).shouldDelayChildPressedState()) { 6745 return true; 6746 } 6747 p = p.getParent(); 6748 } 6749 return false; 6750 } 6751 6752 /** 6753 * Remove the longpress detection timer. 6754 */ 6755 private void removeLongPressCallback() { 6756 if (mPendingCheckForLongPress != null) { 6757 removeCallbacks(mPendingCheckForLongPress); 6758 } 6759 } 6760 6761 /** 6762 * Remove the pending click action 6763 */ 6764 private void removePerformClickCallback() { 6765 if (mPerformClick != null) { 6766 removeCallbacks(mPerformClick); 6767 } 6768 } 6769 6770 /** 6771 * Remove the prepress detection timer. 6772 */ 6773 private void removeUnsetPressCallback() { 6774 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 6775 setPressed(false); 6776 removeCallbacks(mUnsetPressedState); 6777 } 6778 } 6779 6780 /** 6781 * Remove the tap detection timer. 6782 */ 6783 private void removeTapCallback() { 6784 if (mPendingCheckForTap != null) { 6785 mPrivateFlags &= ~PREPRESSED; 6786 removeCallbacks(mPendingCheckForTap); 6787 } 6788 } 6789 6790 /** 6791 * Cancels a pending long press. Your subclass can use this if you 6792 * want the context menu to come up if the user presses and holds 6793 * at the same place, but you don't want it to come up if they press 6794 * and then move around enough to cause scrolling. 6795 */ 6796 public void cancelLongPress() { 6797 removeLongPressCallback(); 6798 6799 /* 6800 * The prepressed state handled by the tap callback is a display 6801 * construct, but the tap callback will post a long press callback 6802 * less its own timeout. Remove it here. 6803 */ 6804 removeTapCallback(); 6805 } 6806 6807 /** 6808 * Remove the pending callback for sending a 6809 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 6810 */ 6811 private void removeSendViewScrolledAccessibilityEventCallback() { 6812 if (mSendViewScrolledAccessibilityEvent != null) { 6813 removeCallbacks(mSendViewScrolledAccessibilityEvent); 6814 } 6815 } 6816 6817 /** 6818 * Sets the TouchDelegate for this View. 6819 */ 6820 public void setTouchDelegate(TouchDelegate delegate) { 6821 mTouchDelegate = delegate; 6822 } 6823 6824 /** 6825 * Gets the TouchDelegate for this View. 6826 */ 6827 public TouchDelegate getTouchDelegate() { 6828 return mTouchDelegate; 6829 } 6830 6831 /** 6832 * Set flags controlling behavior of this view. 6833 * 6834 * @param flags Constant indicating the value which should be set 6835 * @param mask Constant indicating the bit range that should be changed 6836 */ 6837 void setFlags(int flags, int mask) { 6838 int old = mViewFlags; 6839 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6840 6841 int changed = mViewFlags ^ old; 6842 if (changed == 0) { 6843 return; 6844 } 6845 int privateFlags = mPrivateFlags; 6846 6847 /* Check if the FOCUSABLE bit has changed */ 6848 if (((changed & FOCUSABLE_MASK) != 0) && 6849 ((privateFlags & HAS_BOUNDS) !=0)) { 6850 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6851 && ((privateFlags & FOCUSED) != 0)) { 6852 /* Give up focus if we are no longer focusable */ 6853 clearFocus(); 6854 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6855 && ((privateFlags & FOCUSED) == 0)) { 6856 /* 6857 * Tell the view system that we are now available to take focus 6858 * if no one else already has it. 6859 */ 6860 if (mParent != null) mParent.focusableViewAvailable(this); 6861 } 6862 } 6863 6864 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6865 if ((changed & VISIBILITY_MASK) != 0) { 6866 /* 6867 * If this view is becoming visible, invalidate it in case it changed while 6868 * it was not visible. Marking it drawn ensures that the invalidation will 6869 * go through. 6870 */ 6871 mPrivateFlags |= DRAWN; 6872 invalidate(true); 6873 6874 needGlobalAttributesUpdate(true); 6875 6876 // a view becoming visible is worth notifying the parent 6877 // about in case nothing has focus. even if this specific view 6878 // isn't focusable, it may contain something that is, so let 6879 // the root view try to give this focus if nothing else does. 6880 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6881 mParent.focusableViewAvailable(this); 6882 } 6883 } 6884 } 6885 6886 /* Check if the GONE bit has changed */ 6887 if ((changed & GONE) != 0) { 6888 needGlobalAttributesUpdate(false); 6889 requestLayout(); 6890 6891 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6892 if (hasFocus()) clearFocus(); 6893 destroyDrawingCache(); 6894 if (mParent instanceof View) { 6895 // GONE views noop invalidation, so invalidate the parent 6896 ((View) mParent).invalidate(true); 6897 } 6898 // Mark the view drawn to ensure that it gets invalidated properly the next 6899 // time it is visible and gets invalidated 6900 mPrivateFlags |= DRAWN; 6901 } 6902 if (mAttachInfo != null) { 6903 mAttachInfo.mViewVisibilityChanged = true; 6904 } 6905 } 6906 6907 /* Check if the VISIBLE bit has changed */ 6908 if ((changed & INVISIBLE) != 0) { 6909 needGlobalAttributesUpdate(false); 6910 /* 6911 * If this view is becoming invisible, set the DRAWN flag so that 6912 * the next invalidate() will not be skipped. 6913 */ 6914 mPrivateFlags |= DRAWN; 6915 6916 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6917 // root view becoming invisible shouldn't clear focus 6918 if (getRootView() != this) { 6919 clearFocus(); 6920 } 6921 } 6922 if (mAttachInfo != null) { 6923 mAttachInfo.mViewVisibilityChanged = true; 6924 } 6925 } 6926 6927 if ((changed & VISIBILITY_MASK) != 0) { 6928 if (mParent instanceof ViewGroup) { 6929 ((ViewGroup) mParent).onChildVisibilityChanged(this, 6930 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 6931 ((View) mParent).invalidate(true); 6932 } else if (mParent != null) { 6933 mParent.invalidateChild(this, null); 6934 } 6935 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6936 } 6937 6938 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6939 destroyDrawingCache(); 6940 } 6941 6942 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6943 destroyDrawingCache(); 6944 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6945 invalidateParentCaches(); 6946 } 6947 6948 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6949 destroyDrawingCache(); 6950 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6951 } 6952 6953 if ((changed & DRAW_MASK) != 0) { 6954 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6955 if (mBGDrawable != null) { 6956 mPrivateFlags &= ~SKIP_DRAW; 6957 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6958 } else { 6959 mPrivateFlags |= SKIP_DRAW; 6960 } 6961 } else { 6962 mPrivateFlags &= ~SKIP_DRAW; 6963 } 6964 requestLayout(); 6965 invalidate(true); 6966 } 6967 6968 if ((changed & KEEP_SCREEN_ON) != 0) { 6969 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6970 mParent.recomputeViewAttributes(this); 6971 } 6972 } 6973 } 6974 6975 /** 6976 * Change the view's z order in the tree, so it's on top of other sibling 6977 * views 6978 */ 6979 public void bringToFront() { 6980 if (mParent != null) { 6981 mParent.bringChildToFront(this); 6982 } 6983 } 6984 6985 /** 6986 * This is called in response to an internal scroll in this view (i.e., the 6987 * view scrolled its own contents). This is typically as a result of 6988 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6989 * called. 6990 * 6991 * @param l Current horizontal scroll origin. 6992 * @param t Current vertical scroll origin. 6993 * @param oldl Previous horizontal scroll origin. 6994 * @param oldt Previous vertical scroll origin. 6995 */ 6996 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6997 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 6998 postSendViewScrolledAccessibilityEventCallback(); 6999 } 7000 7001 mBackgroundSizeChanged = true; 7002 7003 final AttachInfo ai = mAttachInfo; 7004 if (ai != null) { 7005 ai.mViewScrollChanged = true; 7006 } 7007 } 7008 7009 /** 7010 * Interface definition for a callback to be invoked when the layout bounds of a view 7011 * changes due to layout processing. 7012 */ 7013 public interface OnLayoutChangeListener { 7014 /** 7015 * Called when the focus state of a view has changed. 7016 * 7017 * @param v The view whose state has changed. 7018 * @param left The new value of the view's left property. 7019 * @param top The new value of the view's top property. 7020 * @param right The new value of the view's right property. 7021 * @param bottom The new value of the view's bottom property. 7022 * @param oldLeft The previous value of the view's left property. 7023 * @param oldTop The previous value of the view's top property. 7024 * @param oldRight The previous value of the view's right property. 7025 * @param oldBottom The previous value of the view's bottom property. 7026 */ 7027 void onLayoutChange(View v, int left, int top, int right, int bottom, 7028 int oldLeft, int oldTop, int oldRight, int oldBottom); 7029 } 7030 7031 /** 7032 * This is called during layout when the size of this view has changed. If 7033 * you were just added to the view hierarchy, you're called with the old 7034 * values of 0. 7035 * 7036 * @param w Current width of this view. 7037 * @param h Current height of this view. 7038 * @param oldw Old width of this view. 7039 * @param oldh Old height of this view. 7040 */ 7041 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 7042 } 7043 7044 /** 7045 * Called by draw to draw the child views. This may be overridden 7046 * by derived classes to gain control just before its children are drawn 7047 * (but after its own view has been drawn). 7048 * @param canvas the canvas on which to draw the view 7049 */ 7050 protected void dispatchDraw(Canvas canvas) { 7051 } 7052 7053 /** 7054 * Gets the parent of this view. Note that the parent is a 7055 * ViewParent and not necessarily a View. 7056 * 7057 * @return Parent of this view. 7058 */ 7059 public final ViewParent getParent() { 7060 return mParent; 7061 } 7062 7063 /** 7064 * Set the horizontal scrolled position of your view. This will cause a call to 7065 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7066 * invalidated. 7067 * @param value the x position to scroll to 7068 */ 7069 public void setScrollX(int value) { 7070 scrollTo(value, mScrollY); 7071 } 7072 7073 /** 7074 * Set the vertical scrolled position of your view. This will cause a call to 7075 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7076 * invalidated. 7077 * @param value the y position to scroll to 7078 */ 7079 public void setScrollY(int value) { 7080 scrollTo(mScrollX, value); 7081 } 7082 7083 /** 7084 * Return the scrolled left position of this view. This is the left edge of 7085 * the displayed part of your view. You do not need to draw any pixels 7086 * farther left, since those are outside of the frame of your view on 7087 * screen. 7088 * 7089 * @return The left edge of the displayed part of your view, in pixels. 7090 */ 7091 public final int getScrollX() { 7092 return mScrollX; 7093 } 7094 7095 /** 7096 * Return the scrolled top position of this view. This is the top edge of 7097 * the displayed part of your view. You do not need to draw any pixels above 7098 * it, since those are outside of the frame of your view on screen. 7099 * 7100 * @return The top edge of the displayed part of your view, in pixels. 7101 */ 7102 public final int getScrollY() { 7103 return mScrollY; 7104 } 7105 7106 /** 7107 * Return the width of the your view. 7108 * 7109 * @return The width of your view, in pixels. 7110 */ 7111 @ViewDebug.ExportedProperty(category = "layout") 7112 public final int getWidth() { 7113 return mRight - mLeft; 7114 } 7115 7116 /** 7117 * Return the height of your view. 7118 * 7119 * @return The height of your view, in pixels. 7120 */ 7121 @ViewDebug.ExportedProperty(category = "layout") 7122 public final int getHeight() { 7123 return mBottom - mTop; 7124 } 7125 7126 /** 7127 * Return the visible drawing bounds of your view. Fills in the output 7128 * rectangle with the values from getScrollX(), getScrollY(), 7129 * getWidth(), and getHeight(). 7130 * 7131 * @param outRect The (scrolled) drawing bounds of the view. 7132 */ 7133 public void getDrawingRect(Rect outRect) { 7134 outRect.left = mScrollX; 7135 outRect.top = mScrollY; 7136 outRect.right = mScrollX + (mRight - mLeft); 7137 outRect.bottom = mScrollY + (mBottom - mTop); 7138 } 7139 7140 /** 7141 * Like {@link #getMeasuredWidthAndState()}, but only returns the 7142 * raw width component (that is the result is masked by 7143 * {@link #MEASURED_SIZE_MASK}). 7144 * 7145 * @return The raw measured width of this view. 7146 */ 7147 public final int getMeasuredWidth() { 7148 return mMeasuredWidth & MEASURED_SIZE_MASK; 7149 } 7150 7151 /** 7152 * Return the full width measurement information for this view as computed 7153 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7154 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7155 * This should be used during measurement and layout calculations only. Use 7156 * {@link #getWidth()} to see how wide a view is after layout. 7157 * 7158 * @return The measured width of this view as a bit mask. 7159 */ 7160 public final int getMeasuredWidthAndState() { 7161 return mMeasuredWidth; 7162 } 7163 7164 /** 7165 * Like {@link #getMeasuredHeightAndState()}, but only returns the 7166 * raw width component (that is the result is masked by 7167 * {@link #MEASURED_SIZE_MASK}). 7168 * 7169 * @return The raw measured height of this view. 7170 */ 7171 public final int getMeasuredHeight() { 7172 return mMeasuredHeight & MEASURED_SIZE_MASK; 7173 } 7174 7175 /** 7176 * Return the full height measurement information for this view as computed 7177 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 7178 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 7179 * This should be used during measurement and layout calculations only. Use 7180 * {@link #getHeight()} to see how wide a view is after layout. 7181 * 7182 * @return The measured width of this view as a bit mask. 7183 */ 7184 public final int getMeasuredHeightAndState() { 7185 return mMeasuredHeight; 7186 } 7187 7188 /** 7189 * Return only the state bits of {@link #getMeasuredWidthAndState()} 7190 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 7191 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 7192 * and the height component is at the shifted bits 7193 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 7194 */ 7195 public final int getMeasuredState() { 7196 return (mMeasuredWidth&MEASURED_STATE_MASK) 7197 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 7198 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 7199 } 7200 7201 /** 7202 * The transform matrix of this view, which is calculated based on the current 7203 * roation, scale, and pivot properties. 7204 * 7205 * @see #getRotation() 7206 * @see #getScaleX() 7207 * @see #getScaleY() 7208 * @see #getPivotX() 7209 * @see #getPivotY() 7210 * @return The current transform matrix for the view 7211 */ 7212 public Matrix getMatrix() { 7213 if (mTransformationInfo != null) { 7214 updateMatrix(); 7215 return mTransformationInfo.mMatrix; 7216 } 7217 return Matrix.IDENTITY_MATRIX; 7218 } 7219 7220 /** 7221 * Utility function to determine if the value is far enough away from zero to be 7222 * considered non-zero. 7223 * @param value A floating point value to check for zero-ness 7224 * @return whether the passed-in value is far enough away from zero to be considered non-zero 7225 */ 7226 private static boolean nonzero(float value) { 7227 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 7228 } 7229 7230 /** 7231 * Returns true if the transform matrix is the identity matrix. 7232 * Recomputes the matrix if necessary. 7233 * 7234 * @return True if the transform matrix is the identity matrix, false otherwise. 7235 */ 7236 final boolean hasIdentityMatrix() { 7237 if (mTransformationInfo != null) { 7238 updateMatrix(); 7239 return mTransformationInfo.mMatrixIsIdentity; 7240 } 7241 return true; 7242 } 7243 7244 void ensureTransformationInfo() { 7245 if (mTransformationInfo == null) { 7246 mTransformationInfo = new TransformationInfo(); 7247 } 7248 } 7249 7250 /** 7251 * Recomputes the transform matrix if necessary. 7252 */ 7253 private void updateMatrix() { 7254 final TransformationInfo info = mTransformationInfo; 7255 if (info == null) { 7256 return; 7257 } 7258 if (info.mMatrixDirty) { 7259 // transform-related properties have changed since the last time someone 7260 // asked for the matrix; recalculate it with the current values 7261 7262 // Figure out if we need to update the pivot point 7263 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7264 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 7265 info.mPrevWidth = mRight - mLeft; 7266 info.mPrevHeight = mBottom - mTop; 7267 info.mPivotX = info.mPrevWidth / 2f; 7268 info.mPivotY = info.mPrevHeight / 2f; 7269 } 7270 } 7271 info.mMatrix.reset(); 7272 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 7273 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 7274 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 7275 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7276 } else { 7277 if (info.mCamera == null) { 7278 info.mCamera = new Camera(); 7279 info.matrix3D = new Matrix(); 7280 } 7281 info.mCamera.save(); 7282 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7283 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 7284 info.mCamera.getMatrix(info.matrix3D); 7285 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 7286 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 7287 info.mPivotY + info.mTranslationY); 7288 info.mMatrix.postConcat(info.matrix3D); 7289 info.mCamera.restore(); 7290 } 7291 info.mMatrixDirty = false; 7292 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 7293 info.mInverseMatrixDirty = true; 7294 } 7295 } 7296 7297 /** 7298 * Utility method to retrieve the inverse of the current mMatrix property. 7299 * We cache the matrix to avoid recalculating it when transform properties 7300 * have not changed. 7301 * 7302 * @return The inverse of the current matrix of this view. 7303 */ 7304 final Matrix getInverseMatrix() { 7305 final TransformationInfo info = mTransformationInfo; 7306 if (info != null) { 7307 updateMatrix(); 7308 if (info.mInverseMatrixDirty) { 7309 if (info.mInverseMatrix == null) { 7310 info.mInverseMatrix = new Matrix(); 7311 } 7312 info.mMatrix.invert(info.mInverseMatrix); 7313 info.mInverseMatrixDirty = false; 7314 } 7315 return info.mInverseMatrix; 7316 } 7317 return Matrix.IDENTITY_MATRIX; 7318 } 7319 7320 /** 7321 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 7322 * views are drawn) from the camera to this view. The camera's distance 7323 * affects 3D transformations, for instance rotations around the X and Y 7324 * axis. If the rotationX or rotationY properties are changed and this view is 7325 * large (more than half the size of the screen), it is recommended to always 7326 * use a camera distance that's greater than the height (X axis rotation) or 7327 * the width (Y axis rotation) of this view.</p> 7328 * 7329 * <p>The distance of the camera from the view plane can have an affect on the 7330 * perspective distortion of the view when it is rotated around the x or y axis. 7331 * For example, a large distance will result in a large viewing angle, and there 7332 * will not be much perspective distortion of the view as it rotates. A short 7333 * distance may cause much more perspective distortion upon rotation, and can 7334 * also result in some drawing artifacts if the rotated view ends up partially 7335 * behind the camera (which is why the recommendation is to use a distance at 7336 * least as far as the size of the view, if the view is to be rotated.)</p> 7337 * 7338 * <p>The distance is expressed in "depth pixels." The default distance depends 7339 * on the screen density. For instance, on a medium density display, the 7340 * default distance is 1280. On a high density display, the default distance 7341 * is 1920.</p> 7342 * 7343 * <p>If you want to specify a distance that leads to visually consistent 7344 * results across various densities, use the following formula:</p> 7345 * <pre> 7346 * float scale = context.getResources().getDisplayMetrics().density; 7347 * view.setCameraDistance(distance * scale); 7348 * </pre> 7349 * 7350 * <p>The density scale factor of a high density display is 1.5, 7351 * and 1920 = 1280 * 1.5.</p> 7352 * 7353 * @param distance The distance in "depth pixels", if negative the opposite 7354 * value is used 7355 * 7356 * @see #setRotationX(float) 7357 * @see #setRotationY(float) 7358 */ 7359 public void setCameraDistance(float distance) { 7360 invalidateParentCaches(); 7361 invalidate(false); 7362 7363 ensureTransformationInfo(); 7364 final float dpi = mResources.getDisplayMetrics().densityDpi; 7365 final TransformationInfo info = mTransformationInfo; 7366 if (info.mCamera == null) { 7367 info.mCamera = new Camera(); 7368 info.matrix3D = new Matrix(); 7369 } 7370 7371 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 7372 info.mMatrixDirty = true; 7373 7374 invalidate(false); 7375 } 7376 7377 /** 7378 * The degrees that the view is rotated around the pivot point. 7379 * 7380 * @see #setRotation(float) 7381 * @see #getPivotX() 7382 * @see #getPivotY() 7383 * 7384 * @return The degrees of rotation. 7385 */ 7386 @ViewDebug.ExportedProperty(category = "drawing") 7387 public float getRotation() { 7388 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 7389 } 7390 7391 /** 7392 * Sets the degrees that the view is rotated around the pivot point. Increasing values 7393 * result in clockwise rotation. 7394 * 7395 * @param rotation The degrees of rotation. 7396 * 7397 * @see #getRotation() 7398 * @see #getPivotX() 7399 * @see #getPivotY() 7400 * @see #setRotationX(float) 7401 * @see #setRotationY(float) 7402 * 7403 * @attr ref android.R.styleable#View_rotation 7404 */ 7405 public void setRotation(float rotation) { 7406 ensureTransformationInfo(); 7407 final TransformationInfo info = mTransformationInfo; 7408 if (info.mRotation != rotation) { 7409 invalidateParentCaches(); 7410 // Double-invalidation is necessary to capture view's old and new areas 7411 invalidate(false); 7412 info.mRotation = rotation; 7413 info.mMatrixDirty = true; 7414 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7415 invalidate(false); 7416 } 7417 } 7418 7419 /** 7420 * The degrees that the view is rotated around the vertical axis through the pivot point. 7421 * 7422 * @see #getPivotX() 7423 * @see #getPivotY() 7424 * @see #setRotationY(float) 7425 * 7426 * @return The degrees of Y rotation. 7427 */ 7428 @ViewDebug.ExportedProperty(category = "drawing") 7429 public float getRotationY() { 7430 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 7431 } 7432 7433 /** 7434 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 7435 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 7436 * down the y axis. 7437 * 7438 * When rotating large views, it is recommended to adjust the camera distance 7439 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7440 * 7441 * @param rotationY The degrees of Y rotation. 7442 * 7443 * @see #getRotationY() 7444 * @see #getPivotX() 7445 * @see #getPivotY() 7446 * @see #setRotation(float) 7447 * @see #setRotationX(float) 7448 * @see #setCameraDistance(float) 7449 * 7450 * @attr ref android.R.styleable#View_rotationY 7451 */ 7452 public void setRotationY(float rotationY) { 7453 ensureTransformationInfo(); 7454 final TransformationInfo info = mTransformationInfo; 7455 if (info.mRotationY != rotationY) { 7456 invalidateParentCaches(); 7457 // Double-invalidation is necessary to capture view's old and new areas 7458 invalidate(false); 7459 info.mRotationY = rotationY; 7460 info.mMatrixDirty = true; 7461 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7462 invalidate(false); 7463 } 7464 } 7465 7466 /** 7467 * The degrees that the view is rotated around the horizontal axis through the pivot point. 7468 * 7469 * @see #getPivotX() 7470 * @see #getPivotY() 7471 * @see #setRotationX(float) 7472 * 7473 * @return The degrees of X rotation. 7474 */ 7475 @ViewDebug.ExportedProperty(category = "drawing") 7476 public float getRotationX() { 7477 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 7478 } 7479 7480 /** 7481 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 7482 * Increasing values result in clockwise rotation from the viewpoint of looking down the 7483 * x axis. 7484 * 7485 * When rotating large views, it is recommended to adjust the camera distance 7486 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7487 * 7488 * @param rotationX The degrees of X rotation. 7489 * 7490 * @see #getRotationX() 7491 * @see #getPivotX() 7492 * @see #getPivotY() 7493 * @see #setRotation(float) 7494 * @see #setRotationY(float) 7495 * @see #setCameraDistance(float) 7496 * 7497 * @attr ref android.R.styleable#View_rotationX 7498 */ 7499 public void setRotationX(float rotationX) { 7500 ensureTransformationInfo(); 7501 final TransformationInfo info = mTransformationInfo; 7502 if (info.mRotationX != rotationX) { 7503 invalidateParentCaches(); 7504 // Double-invalidation is necessary to capture view's old and new areas 7505 invalidate(false); 7506 info.mRotationX = rotationX; 7507 info.mMatrixDirty = true; 7508 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7509 invalidate(false); 7510 } 7511 } 7512 7513 /** 7514 * The amount that the view is scaled in x around the pivot point, as a proportion of 7515 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 7516 * 7517 * <p>By default, this is 1.0f. 7518 * 7519 * @see #getPivotX() 7520 * @see #getPivotY() 7521 * @return The scaling factor. 7522 */ 7523 @ViewDebug.ExportedProperty(category = "drawing") 7524 public float getScaleX() { 7525 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 7526 } 7527 7528 /** 7529 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 7530 * the view's unscaled width. A value of 1 means that no scaling is applied. 7531 * 7532 * @param scaleX The scaling factor. 7533 * @see #getPivotX() 7534 * @see #getPivotY() 7535 * 7536 * @attr ref android.R.styleable#View_scaleX 7537 */ 7538 public void setScaleX(float scaleX) { 7539 ensureTransformationInfo(); 7540 final TransformationInfo info = mTransformationInfo; 7541 if (info.mScaleX != scaleX) { 7542 invalidateParentCaches(); 7543 // Double-invalidation is necessary to capture view's old and new areas 7544 invalidate(false); 7545 info.mScaleX = scaleX; 7546 info.mMatrixDirty = true; 7547 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7548 invalidate(false); 7549 } 7550 } 7551 7552 /** 7553 * The amount that the view is scaled in y around the pivot point, as a proportion of 7554 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 7555 * 7556 * <p>By default, this is 1.0f. 7557 * 7558 * @see #getPivotX() 7559 * @see #getPivotY() 7560 * @return The scaling factor. 7561 */ 7562 @ViewDebug.ExportedProperty(category = "drawing") 7563 public float getScaleY() { 7564 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 7565 } 7566 7567 /** 7568 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 7569 * the view's unscaled width. A value of 1 means that no scaling is applied. 7570 * 7571 * @param scaleY The scaling factor. 7572 * @see #getPivotX() 7573 * @see #getPivotY() 7574 * 7575 * @attr ref android.R.styleable#View_scaleY 7576 */ 7577 public void setScaleY(float scaleY) { 7578 ensureTransformationInfo(); 7579 final TransformationInfo info = mTransformationInfo; 7580 if (info.mScaleY != scaleY) { 7581 invalidateParentCaches(); 7582 // Double-invalidation is necessary to capture view's old and new areas 7583 invalidate(false); 7584 info.mScaleY = scaleY; 7585 info.mMatrixDirty = true; 7586 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7587 invalidate(false); 7588 } 7589 } 7590 7591 /** 7592 * The x location of the point around which the view is {@link #setRotation(float) rotated} 7593 * and {@link #setScaleX(float) scaled}. 7594 * 7595 * @see #getRotation() 7596 * @see #getScaleX() 7597 * @see #getScaleY() 7598 * @see #getPivotY() 7599 * @return The x location of the pivot point. 7600 */ 7601 @ViewDebug.ExportedProperty(category = "drawing") 7602 public float getPivotX() { 7603 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 7604 } 7605 7606 /** 7607 * Sets the x location of the point around which the view is 7608 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 7609 * By default, the pivot point is centered on the object. 7610 * Setting this property disables this behavior and causes the view to use only the 7611 * explicitly set pivotX and pivotY values. 7612 * 7613 * @param pivotX The x location of the pivot point. 7614 * @see #getRotation() 7615 * @see #getScaleX() 7616 * @see #getScaleY() 7617 * @see #getPivotY() 7618 * 7619 * @attr ref android.R.styleable#View_transformPivotX 7620 */ 7621 public void setPivotX(float pivotX) { 7622 ensureTransformationInfo(); 7623 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7624 final TransformationInfo info = mTransformationInfo; 7625 if (info.mPivotX != pivotX) { 7626 invalidateParentCaches(); 7627 // Double-invalidation is necessary to capture view's old and new areas 7628 invalidate(false); 7629 info.mPivotX = pivotX; 7630 info.mMatrixDirty = true; 7631 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7632 invalidate(false); 7633 } 7634 } 7635 7636 /** 7637 * The y location of the point around which the view is {@link #setRotation(float) rotated} 7638 * and {@link #setScaleY(float) scaled}. 7639 * 7640 * @see #getRotation() 7641 * @see #getScaleX() 7642 * @see #getScaleY() 7643 * @see #getPivotY() 7644 * @return The y location of the pivot point. 7645 */ 7646 @ViewDebug.ExportedProperty(category = "drawing") 7647 public float getPivotY() { 7648 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 7649 } 7650 7651 /** 7652 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 7653 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 7654 * Setting this property disables this behavior and causes the view to use only the 7655 * explicitly set pivotX and pivotY values. 7656 * 7657 * @param pivotY The y location of the pivot point. 7658 * @see #getRotation() 7659 * @see #getScaleX() 7660 * @see #getScaleY() 7661 * @see #getPivotY() 7662 * 7663 * @attr ref android.R.styleable#View_transformPivotY 7664 */ 7665 public void setPivotY(float pivotY) { 7666 ensureTransformationInfo(); 7667 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7668 final TransformationInfo info = mTransformationInfo; 7669 if (info.mPivotY != pivotY) { 7670 invalidateParentCaches(); 7671 // Double-invalidation is necessary to capture view's old and new areas 7672 invalidate(false); 7673 info.mPivotY = pivotY; 7674 info.mMatrixDirty = true; 7675 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7676 invalidate(false); 7677 } 7678 } 7679 7680 /** 7681 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 7682 * completely transparent and 1 means the view is completely opaque. 7683 * 7684 * <p>By default this is 1.0f. 7685 * @return The opacity of the view. 7686 */ 7687 @ViewDebug.ExportedProperty(category = "drawing") 7688 public float getAlpha() { 7689 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 7690 } 7691 7692 /** 7693 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 7694 * completely transparent and 1 means the view is completely opaque.</p> 7695 * 7696 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 7697 * responsible for applying the opacity itself. Otherwise, calling this method is 7698 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 7699 * setting a hardware layer.</p> 7700 * 7701 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 7702 * performance implications. It is generally best to use the alpha property sparingly and 7703 * transiently, as in the case of fading animations.</p> 7704 * 7705 * @param alpha The opacity of the view. 7706 * 7707 * @see #setLayerType(int, android.graphics.Paint) 7708 * 7709 * @attr ref android.R.styleable#View_alpha 7710 */ 7711 public void setAlpha(float alpha) { 7712 ensureTransformationInfo(); 7713 if (mTransformationInfo.mAlpha != alpha) { 7714 mTransformationInfo.mAlpha = alpha; 7715 invalidateParentCaches(); 7716 if (onSetAlpha((int) (alpha * 255))) { 7717 mPrivateFlags |= ALPHA_SET; 7718 // subclass is handling alpha - don't optimize rendering cache invalidation 7719 invalidate(true); 7720 } else { 7721 mPrivateFlags &= ~ALPHA_SET; 7722 invalidate(false); 7723 } 7724 } 7725 } 7726 7727 /** 7728 * Faster version of setAlpha() which performs the same steps except there are 7729 * no calls to invalidate(). The caller of this function should perform proper invalidation 7730 * on the parent and this object. The return value indicates whether the subclass handles 7731 * alpha (the return value for onSetAlpha()). 7732 * 7733 * @param alpha The new value for the alpha property 7734 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 7735 * the new value for the alpha property is different from the old value 7736 */ 7737 boolean setAlphaNoInvalidation(float alpha) { 7738 ensureTransformationInfo(); 7739 if (mTransformationInfo.mAlpha != alpha) { 7740 mTransformationInfo.mAlpha = alpha; 7741 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 7742 if (subclassHandlesAlpha) { 7743 mPrivateFlags |= ALPHA_SET; 7744 return true; 7745 } else { 7746 mPrivateFlags &= ~ALPHA_SET; 7747 } 7748 } 7749 return false; 7750 } 7751 7752 /** 7753 * Top position of this view relative to its parent. 7754 * 7755 * @return The top of this view, in pixels. 7756 */ 7757 @ViewDebug.CapturedViewProperty 7758 public final int getTop() { 7759 return mTop; 7760 } 7761 7762 /** 7763 * Sets the top position of this view relative to its parent. This method is meant to be called 7764 * by the layout system and should not generally be called otherwise, because the property 7765 * may be changed at any time by the layout. 7766 * 7767 * @param top The top of this view, in pixels. 7768 */ 7769 public final void setTop(int top) { 7770 if (top != mTop) { 7771 updateMatrix(); 7772 final boolean matrixIsIdentity = mTransformationInfo == null 7773 || mTransformationInfo.mMatrixIsIdentity; 7774 if (matrixIsIdentity) { 7775 if (mAttachInfo != null) { 7776 int minTop; 7777 int yLoc; 7778 if (top < mTop) { 7779 minTop = top; 7780 yLoc = top - mTop; 7781 } else { 7782 minTop = mTop; 7783 yLoc = 0; 7784 } 7785 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 7786 } 7787 } else { 7788 // Double-invalidation is necessary to capture view's old and new areas 7789 invalidate(true); 7790 } 7791 7792 int width = mRight - mLeft; 7793 int oldHeight = mBottom - mTop; 7794 7795 mTop = top; 7796 7797 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7798 7799 if (!matrixIsIdentity) { 7800 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7801 // A change in dimension means an auto-centered pivot point changes, too 7802 mTransformationInfo.mMatrixDirty = true; 7803 } 7804 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7805 invalidate(true); 7806 } 7807 mBackgroundSizeChanged = true; 7808 invalidateParentIfNeeded(); 7809 } 7810 } 7811 7812 /** 7813 * Bottom position of this view relative to its parent. 7814 * 7815 * @return The bottom of this view, in pixels. 7816 */ 7817 @ViewDebug.CapturedViewProperty 7818 public final int getBottom() { 7819 return mBottom; 7820 } 7821 7822 /** 7823 * True if this view has changed since the last time being drawn. 7824 * 7825 * @return The dirty state of this view. 7826 */ 7827 public boolean isDirty() { 7828 return (mPrivateFlags & DIRTY_MASK) != 0; 7829 } 7830 7831 /** 7832 * Sets the bottom position of this view relative to its parent. This method is meant to be 7833 * called by the layout system and should not generally be called otherwise, because the 7834 * property may be changed at any time by the layout. 7835 * 7836 * @param bottom The bottom of this view, in pixels. 7837 */ 7838 public final void setBottom(int bottom) { 7839 if (bottom != mBottom) { 7840 updateMatrix(); 7841 final boolean matrixIsIdentity = mTransformationInfo == null 7842 || mTransformationInfo.mMatrixIsIdentity; 7843 if (matrixIsIdentity) { 7844 if (mAttachInfo != null) { 7845 int maxBottom; 7846 if (bottom < mBottom) { 7847 maxBottom = mBottom; 7848 } else { 7849 maxBottom = bottom; 7850 } 7851 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 7852 } 7853 } else { 7854 // Double-invalidation is necessary to capture view's old and new areas 7855 invalidate(true); 7856 } 7857 7858 int width = mRight - mLeft; 7859 int oldHeight = mBottom - mTop; 7860 7861 mBottom = bottom; 7862 7863 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7864 7865 if (!matrixIsIdentity) { 7866 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7867 // A change in dimension means an auto-centered pivot point changes, too 7868 mTransformationInfo.mMatrixDirty = true; 7869 } 7870 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7871 invalidate(true); 7872 } 7873 mBackgroundSizeChanged = true; 7874 invalidateParentIfNeeded(); 7875 } 7876 } 7877 7878 /** 7879 * Left position of this view relative to its parent. 7880 * 7881 * @return The left edge of this view, in pixels. 7882 */ 7883 @ViewDebug.CapturedViewProperty 7884 public final int getLeft() { 7885 return mLeft; 7886 } 7887 7888 /** 7889 * Sets the left position of this view relative to its parent. This method is meant to be called 7890 * by the layout system and should not generally be called otherwise, because the property 7891 * may be changed at any time by the layout. 7892 * 7893 * @param left The bottom of this view, in pixels. 7894 */ 7895 public final void setLeft(int left) { 7896 if (left != mLeft) { 7897 updateMatrix(); 7898 final boolean matrixIsIdentity = mTransformationInfo == null 7899 || mTransformationInfo.mMatrixIsIdentity; 7900 if (matrixIsIdentity) { 7901 if (mAttachInfo != null) { 7902 int minLeft; 7903 int xLoc; 7904 if (left < mLeft) { 7905 minLeft = left; 7906 xLoc = left - mLeft; 7907 } else { 7908 minLeft = mLeft; 7909 xLoc = 0; 7910 } 7911 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7912 } 7913 } else { 7914 // Double-invalidation is necessary to capture view's old and new areas 7915 invalidate(true); 7916 } 7917 7918 int oldWidth = mRight - mLeft; 7919 int height = mBottom - mTop; 7920 7921 mLeft = left; 7922 7923 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7924 7925 if (!matrixIsIdentity) { 7926 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7927 // A change in dimension means an auto-centered pivot point changes, too 7928 mTransformationInfo.mMatrixDirty = true; 7929 } 7930 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7931 invalidate(true); 7932 } 7933 mBackgroundSizeChanged = true; 7934 invalidateParentIfNeeded(); 7935 } 7936 } 7937 7938 /** 7939 * Right position of this view relative to its parent. 7940 * 7941 * @return The right edge of this view, in pixels. 7942 */ 7943 @ViewDebug.CapturedViewProperty 7944 public final int getRight() { 7945 return mRight; 7946 } 7947 7948 /** 7949 * Sets the right position of this view relative to its parent. This method is meant to be called 7950 * by the layout system and should not generally be called otherwise, because the property 7951 * may be changed at any time by the layout. 7952 * 7953 * @param right The bottom of this view, in pixels. 7954 */ 7955 public final void setRight(int right) { 7956 if (right != mRight) { 7957 updateMatrix(); 7958 final boolean matrixIsIdentity = mTransformationInfo == null 7959 || mTransformationInfo.mMatrixIsIdentity; 7960 if (matrixIsIdentity) { 7961 if (mAttachInfo != null) { 7962 int maxRight; 7963 if (right < mRight) { 7964 maxRight = mRight; 7965 } else { 7966 maxRight = right; 7967 } 7968 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7969 } 7970 } else { 7971 // Double-invalidation is necessary to capture view's old and new areas 7972 invalidate(true); 7973 } 7974 7975 int oldWidth = mRight - mLeft; 7976 int height = mBottom - mTop; 7977 7978 mRight = right; 7979 7980 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7981 7982 if (!matrixIsIdentity) { 7983 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7984 // A change in dimension means an auto-centered pivot point changes, too 7985 mTransformationInfo.mMatrixDirty = true; 7986 } 7987 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7988 invalidate(true); 7989 } 7990 mBackgroundSizeChanged = true; 7991 invalidateParentIfNeeded(); 7992 } 7993 } 7994 7995 /** 7996 * The visual x position of this view, in pixels. This is equivalent to the 7997 * {@link #setTranslationX(float) translationX} property plus the current 7998 * {@link #getLeft() left} property. 7999 * 8000 * @return The visual x position of this view, in pixels. 8001 */ 8002 @ViewDebug.ExportedProperty(category = "drawing") 8003 public float getX() { 8004 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 8005 } 8006 8007 /** 8008 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 8009 * {@link #setTranslationX(float) translationX} property to be the difference between 8010 * the x value passed in and the current {@link #getLeft() left} property. 8011 * 8012 * @param x The visual x position of this view, in pixels. 8013 */ 8014 public void setX(float x) { 8015 setTranslationX(x - mLeft); 8016 } 8017 8018 /** 8019 * The visual y position of this view, in pixels. This is equivalent to the 8020 * {@link #setTranslationY(float) translationY} property plus the current 8021 * {@link #getTop() top} property. 8022 * 8023 * @return The visual y position of this view, in pixels. 8024 */ 8025 @ViewDebug.ExportedProperty(category = "drawing") 8026 public float getY() { 8027 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 8028 } 8029 8030 /** 8031 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 8032 * {@link #setTranslationY(float) translationY} property to be the difference between 8033 * the y value passed in and the current {@link #getTop() top} property. 8034 * 8035 * @param y The visual y position of this view, in pixels. 8036 */ 8037 public void setY(float y) { 8038 setTranslationY(y - mTop); 8039 } 8040 8041 8042 /** 8043 * The horizontal location of this view relative to its {@link #getLeft() left} position. 8044 * This position is post-layout, in addition to wherever the object's 8045 * layout placed it. 8046 * 8047 * @return The horizontal position of this view relative to its left position, in pixels. 8048 */ 8049 @ViewDebug.ExportedProperty(category = "drawing") 8050 public float getTranslationX() { 8051 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 8052 } 8053 8054 /** 8055 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 8056 * This effectively positions the object post-layout, in addition to wherever the object's 8057 * layout placed it. 8058 * 8059 * @param translationX The horizontal position of this view relative to its left position, 8060 * in pixels. 8061 * 8062 * @attr ref android.R.styleable#View_translationX 8063 */ 8064 public void setTranslationX(float translationX) { 8065 ensureTransformationInfo(); 8066 final TransformationInfo info = mTransformationInfo; 8067 if (info.mTranslationX != translationX) { 8068 invalidateParentCaches(); 8069 // Double-invalidation is necessary to capture view's old and new areas 8070 invalidate(false); 8071 info.mTranslationX = translationX; 8072 info.mMatrixDirty = true; 8073 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8074 invalidate(false); 8075 } 8076 } 8077 8078 /** 8079 * The horizontal location of this view relative to its {@link #getTop() top} position. 8080 * This position is post-layout, in addition to wherever the object's 8081 * layout placed it. 8082 * 8083 * @return The vertical position of this view relative to its top position, 8084 * in pixels. 8085 */ 8086 @ViewDebug.ExportedProperty(category = "drawing") 8087 public float getTranslationY() { 8088 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 8089 } 8090 8091 /** 8092 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 8093 * This effectively positions the object post-layout, in addition to wherever the object's 8094 * layout placed it. 8095 * 8096 * @param translationY The vertical position of this view relative to its top position, 8097 * in pixels. 8098 * 8099 * @attr ref android.R.styleable#View_translationY 8100 */ 8101 public void setTranslationY(float translationY) { 8102 ensureTransformationInfo(); 8103 final TransformationInfo info = mTransformationInfo; 8104 if (info.mTranslationY != translationY) { 8105 invalidateParentCaches(); 8106 // Double-invalidation is necessary to capture view's old and new areas 8107 invalidate(false); 8108 info.mTranslationY = translationY; 8109 info.mMatrixDirty = true; 8110 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8111 invalidate(false); 8112 } 8113 } 8114 8115 /** 8116 * Hit rectangle in parent's coordinates 8117 * 8118 * @param outRect The hit rectangle of the view. 8119 */ 8120 public void getHitRect(Rect outRect) { 8121 updateMatrix(); 8122 final TransformationInfo info = mTransformationInfo; 8123 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 8124 outRect.set(mLeft, mTop, mRight, mBottom); 8125 } else { 8126 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 8127 tmpRect.set(-info.mPivotX, -info.mPivotY, 8128 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 8129 info.mMatrix.mapRect(tmpRect); 8130 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 8131 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 8132 } 8133 } 8134 8135 /** 8136 * Determines whether the given point, in local coordinates is inside the view. 8137 */ 8138 /*package*/ final boolean pointInView(float localX, float localY) { 8139 return localX >= 0 && localX < (mRight - mLeft) 8140 && localY >= 0 && localY < (mBottom - mTop); 8141 } 8142 8143 /** 8144 * Utility method to determine whether the given point, in local coordinates, 8145 * is inside the view, where the area of the view is expanded by the slop factor. 8146 * This method is called while processing touch-move events to determine if the event 8147 * is still within the view. 8148 */ 8149 private boolean pointInView(float localX, float localY, float slop) { 8150 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 8151 localY < ((mBottom - mTop) + slop); 8152 } 8153 8154 /** 8155 * When a view has focus and the user navigates away from it, the next view is searched for 8156 * starting from the rectangle filled in by this method. 8157 * 8158 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 8159 * of the view. However, if your view maintains some idea of internal selection, 8160 * such as a cursor, or a selected row or column, you should override this method and 8161 * fill in a more specific rectangle. 8162 * 8163 * @param r The rectangle to fill in, in this view's coordinates. 8164 */ 8165 public void getFocusedRect(Rect r) { 8166 getDrawingRect(r); 8167 } 8168 8169 /** 8170 * If some part of this view is not clipped by any of its parents, then 8171 * return that area in r in global (root) coordinates. To convert r to local 8172 * coordinates (without taking possible View rotations into account), offset 8173 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 8174 * If the view is completely clipped or translated out, return false. 8175 * 8176 * @param r If true is returned, r holds the global coordinates of the 8177 * visible portion of this view. 8178 * @param globalOffset If true is returned, globalOffset holds the dx,dy 8179 * between this view and its root. globalOffet may be null. 8180 * @return true if r is non-empty (i.e. part of the view is visible at the 8181 * root level. 8182 */ 8183 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 8184 int width = mRight - mLeft; 8185 int height = mBottom - mTop; 8186 if (width > 0 && height > 0) { 8187 r.set(0, 0, width, height); 8188 if (globalOffset != null) { 8189 globalOffset.set(-mScrollX, -mScrollY); 8190 } 8191 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 8192 } 8193 return false; 8194 } 8195 8196 public final boolean getGlobalVisibleRect(Rect r) { 8197 return getGlobalVisibleRect(r, null); 8198 } 8199 8200 public final boolean getLocalVisibleRect(Rect r) { 8201 Point offset = new Point(); 8202 if (getGlobalVisibleRect(r, offset)) { 8203 r.offset(-offset.x, -offset.y); // make r local 8204 return true; 8205 } 8206 return false; 8207 } 8208 8209 /** 8210 * Offset this view's vertical location by the specified number of pixels. 8211 * 8212 * @param offset the number of pixels to offset the view by 8213 */ 8214 public void offsetTopAndBottom(int offset) { 8215 if (offset != 0) { 8216 updateMatrix(); 8217 final boolean matrixIsIdentity = mTransformationInfo == null 8218 || mTransformationInfo.mMatrixIsIdentity; 8219 if (matrixIsIdentity) { 8220 final ViewParent p = mParent; 8221 if (p != null && mAttachInfo != null) { 8222 final Rect r = mAttachInfo.mTmpInvalRect; 8223 int minTop; 8224 int maxBottom; 8225 int yLoc; 8226 if (offset < 0) { 8227 minTop = mTop + offset; 8228 maxBottom = mBottom; 8229 yLoc = offset; 8230 } else { 8231 minTop = mTop; 8232 maxBottom = mBottom + offset; 8233 yLoc = 0; 8234 } 8235 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 8236 p.invalidateChild(this, r); 8237 } 8238 } else { 8239 invalidate(false); 8240 } 8241 8242 mTop += offset; 8243 mBottom += offset; 8244 8245 if (!matrixIsIdentity) { 8246 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8247 invalidate(false); 8248 } 8249 invalidateParentIfNeeded(); 8250 } 8251 } 8252 8253 /** 8254 * Offset this view's horizontal location by the specified amount of pixels. 8255 * 8256 * @param offset the numer of pixels to offset the view by 8257 */ 8258 public void offsetLeftAndRight(int offset) { 8259 if (offset != 0) { 8260 updateMatrix(); 8261 final boolean matrixIsIdentity = mTransformationInfo == null 8262 || mTransformationInfo.mMatrixIsIdentity; 8263 if (matrixIsIdentity) { 8264 final ViewParent p = mParent; 8265 if (p != null && mAttachInfo != null) { 8266 final Rect r = mAttachInfo.mTmpInvalRect; 8267 int minLeft; 8268 int maxRight; 8269 if (offset < 0) { 8270 minLeft = mLeft + offset; 8271 maxRight = mRight; 8272 } else { 8273 minLeft = mLeft; 8274 maxRight = mRight + offset; 8275 } 8276 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 8277 p.invalidateChild(this, r); 8278 } 8279 } else { 8280 invalidate(false); 8281 } 8282 8283 mLeft += offset; 8284 mRight += offset; 8285 8286 if (!matrixIsIdentity) { 8287 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8288 invalidate(false); 8289 } 8290 invalidateParentIfNeeded(); 8291 } 8292 } 8293 8294 /** 8295 * Get the LayoutParams associated with this view. All views should have 8296 * layout parameters. These supply parameters to the <i>parent</i> of this 8297 * view specifying how it should be arranged. There are many subclasses of 8298 * ViewGroup.LayoutParams, and these correspond to the different subclasses 8299 * of ViewGroup that are responsible for arranging their children. 8300 * 8301 * This method may return null if this View is not attached to a parent 8302 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 8303 * was not invoked successfully. When a View is attached to a parent 8304 * ViewGroup, this method must not return null. 8305 * 8306 * @return The LayoutParams associated with this view, or null if no 8307 * parameters have been set yet 8308 */ 8309 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 8310 public ViewGroup.LayoutParams getLayoutParams() { 8311 return mLayoutParams; 8312 } 8313 8314 /** 8315 * Set the layout parameters associated with this view. These supply 8316 * parameters to the <i>parent</i> of this view specifying how it should be 8317 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 8318 * correspond to the different subclasses of ViewGroup that are responsible 8319 * for arranging their children. 8320 * 8321 * @param params The layout parameters for this view, cannot be null 8322 */ 8323 public void setLayoutParams(ViewGroup.LayoutParams params) { 8324 if (params == null) { 8325 throw new NullPointerException("Layout parameters cannot be null"); 8326 } 8327 mLayoutParams = params; 8328 if (mParent instanceof ViewGroup) { 8329 ((ViewGroup) mParent).onSetLayoutParams(this, params); 8330 } 8331 requestLayout(); 8332 } 8333 8334 /** 8335 * Set the scrolled position of your view. This will cause a call to 8336 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8337 * invalidated. 8338 * @param x the x position to scroll to 8339 * @param y the y position to scroll to 8340 */ 8341 public void scrollTo(int x, int y) { 8342 if (mScrollX != x || mScrollY != y) { 8343 int oldX = mScrollX; 8344 int oldY = mScrollY; 8345 mScrollX = x; 8346 mScrollY = y; 8347 invalidateParentCaches(); 8348 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 8349 if (!awakenScrollBars()) { 8350 invalidate(true); 8351 } 8352 } 8353 } 8354 8355 /** 8356 * Move the scrolled position of your view. This will cause a call to 8357 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8358 * invalidated. 8359 * @param x the amount of pixels to scroll by horizontally 8360 * @param y the amount of pixels to scroll by vertically 8361 */ 8362 public void scrollBy(int x, int y) { 8363 scrollTo(mScrollX + x, mScrollY + y); 8364 } 8365 8366 /** 8367 * <p>Trigger the scrollbars to draw. When invoked this method starts an 8368 * animation to fade the scrollbars out after a default delay. If a subclass 8369 * provides animated scrolling, the start delay should equal the duration 8370 * of the scrolling animation.</p> 8371 * 8372 * <p>The animation starts only if at least one of the scrollbars is 8373 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 8374 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8375 * this method returns true, and false otherwise. If the animation is 8376 * started, this method calls {@link #invalidate()}; in that case the 8377 * caller should not call {@link #invalidate()}.</p> 8378 * 8379 * <p>This method should be invoked every time a subclass directly updates 8380 * the scroll parameters.</p> 8381 * 8382 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 8383 * and {@link #scrollTo(int, int)}.</p> 8384 * 8385 * @return true if the animation is played, false otherwise 8386 * 8387 * @see #awakenScrollBars(int) 8388 * @see #scrollBy(int, int) 8389 * @see #scrollTo(int, int) 8390 * @see #isHorizontalScrollBarEnabled() 8391 * @see #isVerticalScrollBarEnabled() 8392 * @see #setHorizontalScrollBarEnabled(boolean) 8393 * @see #setVerticalScrollBarEnabled(boolean) 8394 */ 8395 protected boolean awakenScrollBars() { 8396 return mScrollCache != null && 8397 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 8398 } 8399 8400 /** 8401 * Trigger the scrollbars to draw. 8402 * This method differs from awakenScrollBars() only in its default duration. 8403 * initialAwakenScrollBars() will show the scroll bars for longer than 8404 * usual to give the user more of a chance to notice them. 8405 * 8406 * @return true if the animation is played, false otherwise. 8407 */ 8408 private boolean initialAwakenScrollBars() { 8409 return mScrollCache != null && 8410 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 8411 } 8412 8413 /** 8414 * <p> 8415 * Trigger the scrollbars to draw. When invoked this method starts an 8416 * animation to fade the scrollbars out after a fixed delay. If a subclass 8417 * provides animated scrolling, the start delay should equal the duration of 8418 * the scrolling animation. 8419 * </p> 8420 * 8421 * <p> 8422 * The animation starts only if at least one of the scrollbars is enabled, 8423 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8424 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8425 * this method returns true, and false otherwise. If the animation is 8426 * started, this method calls {@link #invalidate()}; in that case the caller 8427 * should not call {@link #invalidate()}. 8428 * </p> 8429 * 8430 * <p> 8431 * This method should be invoked everytime a subclass directly updates the 8432 * scroll parameters. 8433 * </p> 8434 * 8435 * @param startDelay the delay, in milliseconds, after which the animation 8436 * should start; when the delay is 0, the animation starts 8437 * immediately 8438 * @return true if the animation is played, false otherwise 8439 * 8440 * @see #scrollBy(int, int) 8441 * @see #scrollTo(int, int) 8442 * @see #isHorizontalScrollBarEnabled() 8443 * @see #isVerticalScrollBarEnabled() 8444 * @see #setHorizontalScrollBarEnabled(boolean) 8445 * @see #setVerticalScrollBarEnabled(boolean) 8446 */ 8447 protected boolean awakenScrollBars(int startDelay) { 8448 return awakenScrollBars(startDelay, true); 8449 } 8450 8451 /** 8452 * <p> 8453 * Trigger the scrollbars to draw. When invoked this method starts an 8454 * animation to fade the scrollbars out after a fixed delay. If a subclass 8455 * provides animated scrolling, the start delay should equal the duration of 8456 * the scrolling animation. 8457 * </p> 8458 * 8459 * <p> 8460 * The animation starts only if at least one of the scrollbars is enabled, 8461 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8462 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8463 * this method returns true, and false otherwise. If the animation is 8464 * started, this method calls {@link #invalidate()} if the invalidate parameter 8465 * is set to true; in that case the caller 8466 * should not call {@link #invalidate()}. 8467 * </p> 8468 * 8469 * <p> 8470 * This method should be invoked everytime a subclass directly updates the 8471 * scroll parameters. 8472 * </p> 8473 * 8474 * @param startDelay the delay, in milliseconds, after which the animation 8475 * should start; when the delay is 0, the animation starts 8476 * immediately 8477 * 8478 * @param invalidate Wheter this method should call invalidate 8479 * 8480 * @return true if the animation is played, false otherwise 8481 * 8482 * @see #scrollBy(int, int) 8483 * @see #scrollTo(int, int) 8484 * @see #isHorizontalScrollBarEnabled() 8485 * @see #isVerticalScrollBarEnabled() 8486 * @see #setHorizontalScrollBarEnabled(boolean) 8487 * @see #setVerticalScrollBarEnabled(boolean) 8488 */ 8489 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 8490 final ScrollabilityCache scrollCache = mScrollCache; 8491 8492 if (scrollCache == null || !scrollCache.fadeScrollBars) { 8493 return false; 8494 } 8495 8496 if (scrollCache.scrollBar == null) { 8497 scrollCache.scrollBar = new ScrollBarDrawable(); 8498 } 8499 8500 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 8501 8502 if (invalidate) { 8503 // Invalidate to show the scrollbars 8504 invalidate(true); 8505 } 8506 8507 if (scrollCache.state == ScrollabilityCache.OFF) { 8508 // FIXME: this is copied from WindowManagerService. 8509 // We should get this value from the system when it 8510 // is possible to do so. 8511 final int KEY_REPEAT_FIRST_DELAY = 750; 8512 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 8513 } 8514 8515 // Tell mScrollCache when we should start fading. This may 8516 // extend the fade start time if one was already scheduled 8517 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 8518 scrollCache.fadeStartTime = fadeStartTime; 8519 scrollCache.state = ScrollabilityCache.ON; 8520 8521 // Schedule our fader to run, unscheduling any old ones first 8522 if (mAttachInfo != null) { 8523 mAttachInfo.mHandler.removeCallbacks(scrollCache); 8524 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 8525 } 8526 8527 return true; 8528 } 8529 8530 return false; 8531 } 8532 8533 /** 8534 * Do not invalidate views which are not visible and which are not running an animation. They 8535 * will not get drawn and they should not set dirty flags as if they will be drawn 8536 */ 8537 private boolean skipInvalidate() { 8538 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 8539 (!(mParent instanceof ViewGroup) || 8540 !((ViewGroup) mParent).isViewTransitioning(this)); 8541 } 8542 /** 8543 * Mark the area defined by dirty as needing to be drawn. If the view is 8544 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 8545 * in the future. This must be called from a UI thread. To call from a non-UI 8546 * thread, call {@link #postInvalidate()}. 8547 * 8548 * WARNING: This method is destructive to dirty. 8549 * @param dirty the rectangle representing the bounds of the dirty region 8550 */ 8551 public void invalidate(Rect dirty) { 8552 if (ViewDebug.TRACE_HIERARCHY) { 8553 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8554 } 8555 8556 if (skipInvalidate()) { 8557 return; 8558 } 8559 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8560 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8561 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8562 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8563 mPrivateFlags |= INVALIDATED; 8564 mPrivateFlags |= DIRTY; 8565 final ViewParent p = mParent; 8566 final AttachInfo ai = mAttachInfo; 8567 //noinspection PointlessBooleanExpression,ConstantConditions 8568 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8569 if (p != null && ai != null && ai.mHardwareAccelerated) { 8570 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8571 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8572 p.invalidateChild(this, null); 8573 return; 8574 } 8575 } 8576 if (p != null && ai != null) { 8577 final int scrollX = mScrollX; 8578 final int scrollY = mScrollY; 8579 final Rect r = ai.mTmpInvalRect; 8580 r.set(dirty.left - scrollX, dirty.top - scrollY, 8581 dirty.right - scrollX, dirty.bottom - scrollY); 8582 mParent.invalidateChild(this, r); 8583 } 8584 } 8585 } 8586 8587 /** 8588 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 8589 * The coordinates of the dirty rect are relative to the view. 8590 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 8591 * will be called at some point in the future. This must be called from 8592 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 8593 * @param l the left position of the dirty region 8594 * @param t the top position of the dirty region 8595 * @param r the right position of the dirty region 8596 * @param b the bottom position of the dirty region 8597 */ 8598 public void invalidate(int l, int t, int r, int b) { 8599 if (ViewDebug.TRACE_HIERARCHY) { 8600 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8601 } 8602 8603 if (skipInvalidate()) { 8604 return; 8605 } 8606 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8607 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8608 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8609 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8610 mPrivateFlags |= INVALIDATED; 8611 mPrivateFlags |= DIRTY; 8612 final ViewParent p = mParent; 8613 final AttachInfo ai = mAttachInfo; 8614 //noinspection PointlessBooleanExpression,ConstantConditions 8615 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8616 if (p != null && ai != null && ai.mHardwareAccelerated) { 8617 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8618 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8619 p.invalidateChild(this, null); 8620 return; 8621 } 8622 } 8623 if (p != null && ai != null && l < r && t < b) { 8624 final int scrollX = mScrollX; 8625 final int scrollY = mScrollY; 8626 final Rect tmpr = ai.mTmpInvalRect; 8627 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 8628 p.invalidateChild(this, tmpr); 8629 } 8630 } 8631 } 8632 8633 /** 8634 * Invalidate the whole view. If the view is visible, 8635 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 8636 * the future. This must be called from a UI thread. To call from a non-UI thread, 8637 * call {@link #postInvalidate()}. 8638 */ 8639 public void invalidate() { 8640 invalidate(true); 8641 } 8642 8643 /** 8644 * This is where the invalidate() work actually happens. A full invalidate() 8645 * causes the drawing cache to be invalidated, but this function can be called with 8646 * invalidateCache set to false to skip that invalidation step for cases that do not 8647 * need it (for example, a component that remains at the same dimensions with the same 8648 * content). 8649 * 8650 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 8651 * well. This is usually true for a full invalidate, but may be set to false if the 8652 * View's contents or dimensions have not changed. 8653 */ 8654 void invalidate(boolean invalidateCache) { 8655 if (ViewDebug.TRACE_HIERARCHY) { 8656 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8657 } 8658 8659 if (skipInvalidate()) { 8660 return; 8661 } 8662 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8663 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 8664 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 8665 mLastIsOpaque = isOpaque(); 8666 mPrivateFlags &= ~DRAWN; 8667 mPrivateFlags |= DIRTY; 8668 if (invalidateCache) { 8669 mPrivateFlags |= INVALIDATED; 8670 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8671 } 8672 final AttachInfo ai = mAttachInfo; 8673 final ViewParent p = mParent; 8674 //noinspection PointlessBooleanExpression,ConstantConditions 8675 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8676 if (p != null && ai != null && ai.mHardwareAccelerated) { 8677 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8678 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8679 p.invalidateChild(this, null); 8680 return; 8681 } 8682 } 8683 8684 if (p != null && ai != null) { 8685 final Rect r = ai.mTmpInvalRect; 8686 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8687 // Don't call invalidate -- we don't want to internally scroll 8688 // our own bounds 8689 p.invalidateChild(this, r); 8690 } 8691 } 8692 } 8693 8694 /** 8695 * Used to indicate that the parent of this view should clear its caches. This functionality 8696 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8697 * which is necessary when various parent-managed properties of the view change, such as 8698 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 8699 * clears the parent caches and does not causes an invalidate event. 8700 * 8701 * @hide 8702 */ 8703 protected void invalidateParentCaches() { 8704 if (mParent instanceof View) { 8705 ((View) mParent).mPrivateFlags |= INVALIDATED; 8706 } 8707 } 8708 8709 /** 8710 * Used to indicate that the parent of this view should be invalidated. This functionality 8711 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8712 * which is necessary when various parent-managed properties of the view change, such as 8713 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 8714 * an invalidation event to the parent. 8715 * 8716 * @hide 8717 */ 8718 protected void invalidateParentIfNeeded() { 8719 if (isHardwareAccelerated() && mParent instanceof View) { 8720 ((View) mParent).invalidate(true); 8721 } 8722 } 8723 8724 /** 8725 * Indicates whether this View is opaque. An opaque View guarantees that it will 8726 * draw all the pixels overlapping its bounds using a fully opaque color. 8727 * 8728 * Subclasses of View should override this method whenever possible to indicate 8729 * whether an instance is opaque. Opaque Views are treated in a special way by 8730 * the View hierarchy, possibly allowing it to perform optimizations during 8731 * invalidate/draw passes. 8732 * 8733 * @return True if this View is guaranteed to be fully opaque, false otherwise. 8734 */ 8735 @ViewDebug.ExportedProperty(category = "drawing") 8736 public boolean isOpaque() { 8737 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 8738 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 8739 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 8740 } 8741 8742 /** 8743 * @hide 8744 */ 8745 protected void computeOpaqueFlags() { 8746 // Opaque if: 8747 // - Has a background 8748 // - Background is opaque 8749 // - Doesn't have scrollbars or scrollbars are inside overlay 8750 8751 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 8752 mPrivateFlags |= OPAQUE_BACKGROUND; 8753 } else { 8754 mPrivateFlags &= ~OPAQUE_BACKGROUND; 8755 } 8756 8757 final int flags = mViewFlags; 8758 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 8759 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 8760 mPrivateFlags |= OPAQUE_SCROLLBARS; 8761 } else { 8762 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 8763 } 8764 } 8765 8766 /** 8767 * @hide 8768 */ 8769 protected boolean hasOpaqueScrollbars() { 8770 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 8771 } 8772 8773 /** 8774 * @return A handler associated with the thread running the View. This 8775 * handler can be used to pump events in the UI events queue. 8776 */ 8777 public Handler getHandler() { 8778 if (mAttachInfo != null) { 8779 return mAttachInfo.mHandler; 8780 } 8781 return null; 8782 } 8783 8784 /** 8785 * Gets the view root associated with the View. 8786 * @return The view root, or null if none. 8787 * @hide 8788 */ 8789 public ViewRootImpl getViewRootImpl() { 8790 if (mAttachInfo != null) { 8791 return mAttachInfo.mViewRootImpl; 8792 } 8793 return null; 8794 } 8795 8796 /** 8797 * <p>Causes the Runnable to be added to the message queue. 8798 * The runnable will be run on the user interface thread.</p> 8799 * 8800 * <p>This method can be invoked from outside of the UI thread 8801 * only when this View is attached to a window.</p> 8802 * 8803 * @param action The Runnable that will be executed. 8804 * 8805 * @return Returns true if the Runnable was successfully placed in to the 8806 * message queue. Returns false on failure, usually because the 8807 * looper processing the message queue is exiting. 8808 */ 8809 public boolean post(Runnable action) { 8810 final AttachInfo attachInfo = mAttachInfo; 8811 if (attachInfo != null) { 8812 return attachInfo.mHandler.post(action); 8813 } 8814 // Assume that post will succeed later 8815 ViewRootImpl.getRunQueue().post(action); 8816 return true; 8817 } 8818 8819 /** 8820 * <p>Causes the Runnable to be added to the message queue, to be run 8821 * after the specified amount of time elapses. 8822 * The runnable will be run on the user interface thread.</p> 8823 * 8824 * <p>This method can be invoked from outside of the UI thread 8825 * only when this View is attached to a window.</p> 8826 * 8827 * @param action The Runnable that will be executed. 8828 * @param delayMillis The delay (in milliseconds) until the Runnable 8829 * will be executed. 8830 * 8831 * @return true if the Runnable was successfully placed in to the 8832 * message queue. Returns false on failure, usually because the 8833 * looper processing the message queue is exiting. Note that a 8834 * result of true does not mean the Runnable will be processed -- 8835 * if the looper is quit before the delivery time of the message 8836 * occurs then the message will be dropped. 8837 */ 8838 public boolean postDelayed(Runnable action, long delayMillis) { 8839 final AttachInfo attachInfo = mAttachInfo; 8840 if (attachInfo != null) { 8841 return attachInfo.mHandler.postDelayed(action, delayMillis); 8842 } 8843 // Assume that post will succeed later 8844 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8845 return true; 8846 } 8847 8848 /** 8849 * <p>Causes the Runnable to execute on the next animation time step. 8850 * The runnable will be run on the user interface thread.</p> 8851 * 8852 * <p>This method can be invoked from outside of the UI thread 8853 * only when this View is attached to a window.</p> 8854 * 8855 * @param action The Runnable that will be executed. 8856 * 8857 * @hide 8858 */ 8859 public void postOnAnimation(Runnable action) { 8860 final AttachInfo attachInfo = mAttachInfo; 8861 if (attachInfo != null) { 8862 attachInfo.mViewRootImpl.mChoreographer.postAnimationCallback(action, null); 8863 } else { 8864 // Assume that post will succeed later 8865 ViewRootImpl.getRunQueue().post(action); 8866 } 8867 } 8868 8869 /** 8870 * <p>Causes the Runnable to execute on the next animation time step, 8871 * after the specified amount of time elapses. 8872 * The runnable will be run on the user interface thread.</p> 8873 * 8874 * <p>This method can be invoked from outside of the UI thread 8875 * only when this View is attached to a window.</p> 8876 * 8877 * @param action The Runnable that will be executed. 8878 * @param delayMillis The delay (in milliseconds) until the Runnable 8879 * will be executed. 8880 * 8881 * @hide 8882 */ 8883 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 8884 final AttachInfo attachInfo = mAttachInfo; 8885 if (attachInfo != null) { 8886 attachInfo.mViewRootImpl.mChoreographer.postAnimationCallbackDelayed( 8887 action, null, delayMillis); 8888 } else { 8889 // Assume that post will succeed later 8890 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8891 } 8892 } 8893 8894 /** 8895 * <p>Removes the specified Runnable from the message queue.</p> 8896 * 8897 * <p>This method can be invoked from outside of the UI thread 8898 * only when this View is attached to a window.</p> 8899 * 8900 * @param action The Runnable to remove from the message handling queue 8901 * 8902 * @return true if this view could ask the Handler to remove the Runnable, 8903 * false otherwise. When the returned value is true, the Runnable 8904 * may or may not have been actually removed from the message queue 8905 * (for instance, if the Runnable was not in the queue already.) 8906 */ 8907 public boolean removeCallbacks(Runnable action) { 8908 if (action != null) { 8909 final AttachInfo attachInfo = mAttachInfo; 8910 if (attachInfo != null) { 8911 attachInfo.mHandler.removeCallbacks(action); 8912 attachInfo.mViewRootImpl.mChoreographer.removeAnimationCallbacks(action, null); 8913 } else { 8914 // Assume that post will succeed later 8915 ViewRootImpl.getRunQueue().removeCallbacks(action); 8916 } 8917 } 8918 return true; 8919 } 8920 8921 /** 8922 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 8923 * Use this to invalidate the View from a non-UI thread.</p> 8924 * 8925 * <p>This method can be invoked from outside of the UI thread 8926 * only when this View is attached to a window.</p> 8927 * 8928 * @see #invalidate() 8929 */ 8930 public void postInvalidate() { 8931 postInvalidateDelayed(0); 8932 } 8933 8934 /** 8935 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8936 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 8937 * 8938 * <p>This method can be invoked from outside of the UI thread 8939 * only when this View is attached to a window.</p> 8940 * 8941 * @param left The left coordinate of the rectangle to invalidate. 8942 * @param top The top coordinate of the rectangle to invalidate. 8943 * @param right The right coordinate of the rectangle to invalidate. 8944 * @param bottom The bottom coordinate of the rectangle to invalidate. 8945 * 8946 * @see #invalidate(int, int, int, int) 8947 * @see #invalidate(Rect) 8948 */ 8949 public void postInvalidate(int left, int top, int right, int bottom) { 8950 postInvalidateDelayed(0, left, top, right, bottom); 8951 } 8952 8953 /** 8954 * <p>Cause an invalidate to happen on a subsequent cycle through the event 8955 * loop. Waits for the specified amount of time.</p> 8956 * 8957 * <p>This method can be invoked from outside of the UI thread 8958 * only when this View is attached to a window.</p> 8959 * 8960 * @param delayMilliseconds the duration in milliseconds to delay the 8961 * invalidation by 8962 */ 8963 public void postInvalidateDelayed(long delayMilliseconds) { 8964 // We try only with the AttachInfo because there's no point in invalidating 8965 // if we are not attached to our window 8966 final AttachInfo attachInfo = mAttachInfo; 8967 if (attachInfo != null) { 8968 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 8969 } 8970 } 8971 8972 /** 8973 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8974 * through the event loop. Waits for the specified amount of time.</p> 8975 * 8976 * <p>This method can be invoked from outside of the UI thread 8977 * only when this View is attached to a window.</p> 8978 * 8979 * @param delayMilliseconds the duration in milliseconds to delay the 8980 * invalidation by 8981 * @param left The left coordinate of the rectangle to invalidate. 8982 * @param top The top coordinate of the rectangle to invalidate. 8983 * @param right The right coordinate of the rectangle to invalidate. 8984 * @param bottom The bottom coordinate of the rectangle to invalidate. 8985 */ 8986 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8987 int right, int bottom) { 8988 8989 // We try only with the AttachInfo because there's no point in invalidating 8990 // if we are not attached to our window 8991 final AttachInfo attachInfo = mAttachInfo; 8992 if (attachInfo != null) { 8993 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8994 info.target = this; 8995 info.left = left; 8996 info.top = top; 8997 info.right = right; 8998 info.bottom = bottom; 8999 9000 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 9001 } 9002 } 9003 9004 /** 9005 * <p>Cause an invalidate to happen on the next animation time step, typically the 9006 * next display frame.</p> 9007 * 9008 * <p>This method can be invoked from outside of the UI thread 9009 * only when this View is attached to a window.</p> 9010 * 9011 * @hide 9012 */ 9013 public void postInvalidateOnAnimation() { 9014 // We try only with the AttachInfo because there's no point in invalidating 9015 // if we are not attached to our window 9016 final AttachInfo attachInfo = mAttachInfo; 9017 if (attachInfo != null) { 9018 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 9019 } 9020 } 9021 9022 /** 9023 * <p>Cause an invalidate of the specified area to happen on the next animation 9024 * time step, typically the next display frame.</p> 9025 * 9026 * <p>This method can be invoked from outside of the UI thread 9027 * only when this View is attached to a window.</p> 9028 * 9029 * @param left The left coordinate of the rectangle to invalidate. 9030 * @param top The top coordinate of the rectangle to invalidate. 9031 * @param right The right coordinate of the rectangle to invalidate. 9032 * @param bottom The bottom coordinate of the rectangle to invalidate. 9033 * 9034 * @hide 9035 */ 9036 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 9037 // We try only with the AttachInfo because there's no point in invalidating 9038 // if we are not attached to our window 9039 final AttachInfo attachInfo = mAttachInfo; 9040 if (attachInfo != null) { 9041 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 9042 info.target = this; 9043 info.left = left; 9044 info.top = top; 9045 info.right = right; 9046 info.bottom = bottom; 9047 9048 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 9049 } 9050 } 9051 9052 /** 9053 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 9054 * This event is sent at most once every 9055 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 9056 */ 9057 private void postSendViewScrolledAccessibilityEventCallback() { 9058 if (mSendViewScrolledAccessibilityEvent == null) { 9059 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 9060 } 9061 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 9062 mSendViewScrolledAccessibilityEvent.mIsPending = true; 9063 postDelayed(mSendViewScrolledAccessibilityEvent, 9064 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 9065 } 9066 } 9067 9068 /** 9069 * Called by a parent to request that a child update its values for mScrollX 9070 * and mScrollY if necessary. This will typically be done if the child is 9071 * animating a scroll using a {@link android.widget.Scroller Scroller} 9072 * object. 9073 */ 9074 public void computeScroll() { 9075 } 9076 9077 /** 9078 * <p>Indicate whether the horizontal edges are faded when the view is 9079 * scrolled horizontally.</p> 9080 * 9081 * @return true if the horizontal edges should are faded on scroll, false 9082 * otherwise 9083 * 9084 * @see #setHorizontalFadingEdgeEnabled(boolean) 9085 * @attr ref android.R.styleable#View_requiresFadingEdge 9086 */ 9087 public boolean isHorizontalFadingEdgeEnabled() { 9088 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 9089 } 9090 9091 /** 9092 * <p>Define whether the horizontal edges should be faded when this view 9093 * is scrolled horizontally.</p> 9094 * 9095 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 9096 * be faded when the view is scrolled 9097 * horizontally 9098 * 9099 * @see #isHorizontalFadingEdgeEnabled() 9100 * @attr ref android.R.styleable#View_requiresFadingEdge 9101 */ 9102 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 9103 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 9104 if (horizontalFadingEdgeEnabled) { 9105 initScrollCache(); 9106 } 9107 9108 mViewFlags ^= FADING_EDGE_HORIZONTAL; 9109 } 9110 } 9111 9112 /** 9113 * <p>Indicate whether the vertical edges are faded when the view is 9114 * scrolled horizontally.</p> 9115 * 9116 * @return true if the vertical edges should are faded on scroll, false 9117 * otherwise 9118 * 9119 * @see #setVerticalFadingEdgeEnabled(boolean) 9120 * @attr ref android.R.styleable#View_requiresFadingEdge 9121 */ 9122 public boolean isVerticalFadingEdgeEnabled() { 9123 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 9124 } 9125 9126 /** 9127 * <p>Define whether the vertical edges should be faded when this view 9128 * is scrolled vertically.</p> 9129 * 9130 * @param verticalFadingEdgeEnabled true if the vertical edges should 9131 * be faded when the view is scrolled 9132 * vertically 9133 * 9134 * @see #isVerticalFadingEdgeEnabled() 9135 * @attr ref android.R.styleable#View_requiresFadingEdge 9136 */ 9137 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 9138 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 9139 if (verticalFadingEdgeEnabled) { 9140 initScrollCache(); 9141 } 9142 9143 mViewFlags ^= FADING_EDGE_VERTICAL; 9144 } 9145 } 9146 9147 /** 9148 * Returns the strength, or intensity, of the top faded edge. The strength is 9149 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 9150 * returns 0.0 or 1.0 but no value in between. 9151 * 9152 * Subclasses should override this method to provide a smoother fade transition 9153 * when scrolling occurs. 9154 * 9155 * @return the intensity of the top fade as a float between 0.0f and 1.0f 9156 */ 9157 protected float getTopFadingEdgeStrength() { 9158 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 9159 } 9160 9161 /** 9162 * Returns the strength, or intensity, of the bottom faded edge. The strength is 9163 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 9164 * returns 0.0 or 1.0 but no value in between. 9165 * 9166 * Subclasses should override this method to provide a smoother fade transition 9167 * when scrolling occurs. 9168 * 9169 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 9170 */ 9171 protected float getBottomFadingEdgeStrength() { 9172 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 9173 computeVerticalScrollRange() ? 1.0f : 0.0f; 9174 } 9175 9176 /** 9177 * Returns the strength, or intensity, of the left faded edge. The strength is 9178 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 9179 * returns 0.0 or 1.0 but no value in between. 9180 * 9181 * Subclasses should override this method to provide a smoother fade transition 9182 * when scrolling occurs. 9183 * 9184 * @return the intensity of the left fade as a float between 0.0f and 1.0f 9185 */ 9186 protected float getLeftFadingEdgeStrength() { 9187 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 9188 } 9189 9190 /** 9191 * Returns the strength, or intensity, of the right faded edge. The strength is 9192 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 9193 * returns 0.0 or 1.0 but no value in between. 9194 * 9195 * Subclasses should override this method to provide a smoother fade transition 9196 * when scrolling occurs. 9197 * 9198 * @return the intensity of the right fade as a float between 0.0f and 1.0f 9199 */ 9200 protected float getRightFadingEdgeStrength() { 9201 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 9202 computeHorizontalScrollRange() ? 1.0f : 0.0f; 9203 } 9204 9205 /** 9206 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 9207 * scrollbar is not drawn by default.</p> 9208 * 9209 * @return true if the horizontal scrollbar should be painted, false 9210 * otherwise 9211 * 9212 * @see #setHorizontalScrollBarEnabled(boolean) 9213 */ 9214 public boolean isHorizontalScrollBarEnabled() { 9215 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9216 } 9217 9218 /** 9219 * <p>Define whether the horizontal scrollbar should be drawn or not. The 9220 * scrollbar is not drawn by default.</p> 9221 * 9222 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 9223 * be painted 9224 * 9225 * @see #isHorizontalScrollBarEnabled() 9226 */ 9227 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 9228 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 9229 mViewFlags ^= SCROLLBARS_HORIZONTAL; 9230 computeOpaqueFlags(); 9231 resolvePadding(); 9232 } 9233 } 9234 9235 /** 9236 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 9237 * scrollbar is not drawn by default.</p> 9238 * 9239 * @return true if the vertical scrollbar should be painted, false 9240 * otherwise 9241 * 9242 * @see #setVerticalScrollBarEnabled(boolean) 9243 */ 9244 public boolean isVerticalScrollBarEnabled() { 9245 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 9246 } 9247 9248 /** 9249 * <p>Define whether the vertical scrollbar should be drawn or not. The 9250 * scrollbar is not drawn by default.</p> 9251 * 9252 * @param verticalScrollBarEnabled true if the vertical scrollbar should 9253 * be painted 9254 * 9255 * @see #isVerticalScrollBarEnabled() 9256 */ 9257 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 9258 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 9259 mViewFlags ^= SCROLLBARS_VERTICAL; 9260 computeOpaqueFlags(); 9261 resolvePadding(); 9262 } 9263 } 9264 9265 /** 9266 * @hide 9267 */ 9268 protected void recomputePadding() { 9269 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 9270 } 9271 9272 /** 9273 * Define whether scrollbars will fade when the view is not scrolling. 9274 * 9275 * @param fadeScrollbars wheter to enable fading 9276 * 9277 */ 9278 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 9279 initScrollCache(); 9280 final ScrollabilityCache scrollabilityCache = mScrollCache; 9281 scrollabilityCache.fadeScrollBars = fadeScrollbars; 9282 if (fadeScrollbars) { 9283 scrollabilityCache.state = ScrollabilityCache.OFF; 9284 } else { 9285 scrollabilityCache.state = ScrollabilityCache.ON; 9286 } 9287 } 9288 9289 /** 9290 * 9291 * Returns true if scrollbars will fade when this view is not scrolling 9292 * 9293 * @return true if scrollbar fading is enabled 9294 */ 9295 public boolean isScrollbarFadingEnabled() { 9296 return mScrollCache != null && mScrollCache.fadeScrollBars; 9297 } 9298 9299 /** 9300 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 9301 * inset. When inset, they add to the padding of the view. And the scrollbars 9302 * can be drawn inside the padding area or on the edge of the view. For example, 9303 * if a view has a background drawable and you want to draw the scrollbars 9304 * inside the padding specified by the drawable, you can use 9305 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 9306 * appear at the edge of the view, ignoring the padding, then you can use 9307 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 9308 * @param style the style of the scrollbars. Should be one of 9309 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 9310 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 9311 * @see #SCROLLBARS_INSIDE_OVERLAY 9312 * @see #SCROLLBARS_INSIDE_INSET 9313 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9314 * @see #SCROLLBARS_OUTSIDE_INSET 9315 */ 9316 public void setScrollBarStyle(int style) { 9317 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 9318 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 9319 computeOpaqueFlags(); 9320 resolvePadding(); 9321 } 9322 } 9323 9324 /** 9325 * <p>Returns the current scrollbar style.</p> 9326 * @return the current scrollbar style 9327 * @see #SCROLLBARS_INSIDE_OVERLAY 9328 * @see #SCROLLBARS_INSIDE_INSET 9329 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9330 * @see #SCROLLBARS_OUTSIDE_INSET 9331 */ 9332 @ViewDebug.ExportedProperty(mapping = { 9333 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 9334 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 9335 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 9336 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 9337 }) 9338 public int getScrollBarStyle() { 9339 return mViewFlags & SCROLLBARS_STYLE_MASK; 9340 } 9341 9342 /** 9343 * <p>Compute the horizontal range that the horizontal scrollbar 9344 * represents.</p> 9345 * 9346 * <p>The range is expressed in arbitrary units that must be the same as the 9347 * units used by {@link #computeHorizontalScrollExtent()} and 9348 * {@link #computeHorizontalScrollOffset()}.</p> 9349 * 9350 * <p>The default range is the drawing width of this view.</p> 9351 * 9352 * @return the total horizontal range represented by the horizontal 9353 * scrollbar 9354 * 9355 * @see #computeHorizontalScrollExtent() 9356 * @see #computeHorizontalScrollOffset() 9357 * @see android.widget.ScrollBarDrawable 9358 */ 9359 protected int computeHorizontalScrollRange() { 9360 return getWidth(); 9361 } 9362 9363 /** 9364 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 9365 * within the horizontal range. This value is used to compute the position 9366 * of the thumb within the scrollbar's track.</p> 9367 * 9368 * <p>The range is expressed in arbitrary units that must be the same as the 9369 * units used by {@link #computeHorizontalScrollRange()} and 9370 * {@link #computeHorizontalScrollExtent()}.</p> 9371 * 9372 * <p>The default offset is the scroll offset of this view.</p> 9373 * 9374 * @return the horizontal offset of the scrollbar's thumb 9375 * 9376 * @see #computeHorizontalScrollRange() 9377 * @see #computeHorizontalScrollExtent() 9378 * @see android.widget.ScrollBarDrawable 9379 */ 9380 protected int computeHorizontalScrollOffset() { 9381 return mScrollX; 9382 } 9383 9384 /** 9385 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 9386 * within the horizontal range. This value is used to compute the length 9387 * of the thumb within the scrollbar's track.</p> 9388 * 9389 * <p>The range is expressed in arbitrary units that must be the same as the 9390 * units used by {@link #computeHorizontalScrollRange()} and 9391 * {@link #computeHorizontalScrollOffset()}.</p> 9392 * 9393 * <p>The default extent is the drawing width of this view.</p> 9394 * 9395 * @return the horizontal extent of the scrollbar's thumb 9396 * 9397 * @see #computeHorizontalScrollRange() 9398 * @see #computeHorizontalScrollOffset() 9399 * @see android.widget.ScrollBarDrawable 9400 */ 9401 protected int computeHorizontalScrollExtent() { 9402 return getWidth(); 9403 } 9404 9405 /** 9406 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 9407 * 9408 * <p>The range is expressed in arbitrary units that must be the same as the 9409 * units used by {@link #computeVerticalScrollExtent()} and 9410 * {@link #computeVerticalScrollOffset()}.</p> 9411 * 9412 * @return the total vertical range represented by the vertical scrollbar 9413 * 9414 * <p>The default range is the drawing height of this view.</p> 9415 * 9416 * @see #computeVerticalScrollExtent() 9417 * @see #computeVerticalScrollOffset() 9418 * @see android.widget.ScrollBarDrawable 9419 */ 9420 protected int computeVerticalScrollRange() { 9421 return getHeight(); 9422 } 9423 9424 /** 9425 * <p>Compute the vertical offset of the vertical scrollbar's thumb 9426 * within the horizontal range. This value is used to compute the position 9427 * of the thumb within the scrollbar's track.</p> 9428 * 9429 * <p>The range is expressed in arbitrary units that must be the same as the 9430 * units used by {@link #computeVerticalScrollRange()} and 9431 * {@link #computeVerticalScrollExtent()}.</p> 9432 * 9433 * <p>The default offset is the scroll offset of this view.</p> 9434 * 9435 * @return the vertical offset of the scrollbar's thumb 9436 * 9437 * @see #computeVerticalScrollRange() 9438 * @see #computeVerticalScrollExtent() 9439 * @see android.widget.ScrollBarDrawable 9440 */ 9441 protected int computeVerticalScrollOffset() { 9442 return mScrollY; 9443 } 9444 9445 /** 9446 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 9447 * within the vertical range. This value is used to compute the length 9448 * of the thumb within the scrollbar's track.</p> 9449 * 9450 * <p>The range is expressed in arbitrary units that must be the same as the 9451 * units used by {@link #computeVerticalScrollRange()} and 9452 * {@link #computeVerticalScrollOffset()}.</p> 9453 * 9454 * <p>The default extent is the drawing height of this view.</p> 9455 * 9456 * @return the vertical extent of the scrollbar's thumb 9457 * 9458 * @see #computeVerticalScrollRange() 9459 * @see #computeVerticalScrollOffset() 9460 * @see android.widget.ScrollBarDrawable 9461 */ 9462 protected int computeVerticalScrollExtent() { 9463 return getHeight(); 9464 } 9465 9466 /** 9467 * Check if this view can be scrolled horizontally in a certain direction. 9468 * 9469 * @param direction Negative to check scrolling left, positive to check scrolling right. 9470 * @return true if this view can be scrolled in the specified direction, false otherwise. 9471 */ 9472 public boolean canScrollHorizontally(int direction) { 9473 final int offset = computeHorizontalScrollOffset(); 9474 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 9475 if (range == 0) return false; 9476 if (direction < 0) { 9477 return offset > 0; 9478 } else { 9479 return offset < range - 1; 9480 } 9481 } 9482 9483 /** 9484 * Check if this view can be scrolled vertically in a certain direction. 9485 * 9486 * @param direction Negative to check scrolling up, positive to check scrolling down. 9487 * @return true if this view can be scrolled in the specified direction, false otherwise. 9488 */ 9489 public boolean canScrollVertically(int direction) { 9490 final int offset = computeVerticalScrollOffset(); 9491 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 9492 if (range == 0) return false; 9493 if (direction < 0) { 9494 return offset > 0; 9495 } else { 9496 return offset < range - 1; 9497 } 9498 } 9499 9500 /** 9501 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 9502 * scrollbars are painted only if they have been awakened first.</p> 9503 * 9504 * @param canvas the canvas on which to draw the scrollbars 9505 * 9506 * @see #awakenScrollBars(int) 9507 */ 9508 protected final void onDrawScrollBars(Canvas canvas) { 9509 // scrollbars are drawn only when the animation is running 9510 final ScrollabilityCache cache = mScrollCache; 9511 if (cache != null) { 9512 9513 int state = cache.state; 9514 9515 if (state == ScrollabilityCache.OFF) { 9516 return; 9517 } 9518 9519 boolean invalidate = false; 9520 9521 if (state == ScrollabilityCache.FADING) { 9522 // We're fading -- get our fade interpolation 9523 if (cache.interpolatorValues == null) { 9524 cache.interpolatorValues = new float[1]; 9525 } 9526 9527 float[] values = cache.interpolatorValues; 9528 9529 // Stops the animation if we're done 9530 if (cache.scrollBarInterpolator.timeToValues(values) == 9531 Interpolator.Result.FREEZE_END) { 9532 cache.state = ScrollabilityCache.OFF; 9533 } else { 9534 cache.scrollBar.setAlpha(Math.round(values[0])); 9535 } 9536 9537 // This will make the scroll bars inval themselves after 9538 // drawing. We only want this when we're fading so that 9539 // we prevent excessive redraws 9540 invalidate = true; 9541 } else { 9542 // We're just on -- but we may have been fading before so 9543 // reset alpha 9544 cache.scrollBar.setAlpha(255); 9545 } 9546 9547 9548 final int viewFlags = mViewFlags; 9549 9550 final boolean drawHorizontalScrollBar = 9551 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9552 final boolean drawVerticalScrollBar = 9553 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 9554 && !isVerticalScrollBarHidden(); 9555 9556 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 9557 final int width = mRight - mLeft; 9558 final int height = mBottom - mTop; 9559 9560 final ScrollBarDrawable scrollBar = cache.scrollBar; 9561 9562 final int scrollX = mScrollX; 9563 final int scrollY = mScrollY; 9564 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 9565 9566 int left, top, right, bottom; 9567 9568 if (drawHorizontalScrollBar) { 9569 int size = scrollBar.getSize(false); 9570 if (size <= 0) { 9571 size = cache.scrollBarSize; 9572 } 9573 9574 scrollBar.setParameters(computeHorizontalScrollRange(), 9575 computeHorizontalScrollOffset(), 9576 computeHorizontalScrollExtent(), false); 9577 final int verticalScrollBarGap = drawVerticalScrollBar ? 9578 getVerticalScrollbarWidth() : 0; 9579 top = scrollY + height - size - (mUserPaddingBottom & inside); 9580 left = scrollX + (mPaddingLeft & inside); 9581 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 9582 bottom = top + size; 9583 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 9584 if (invalidate) { 9585 invalidate(left, top, right, bottom); 9586 } 9587 } 9588 9589 if (drawVerticalScrollBar) { 9590 int size = scrollBar.getSize(true); 9591 if (size <= 0) { 9592 size = cache.scrollBarSize; 9593 } 9594 9595 scrollBar.setParameters(computeVerticalScrollRange(), 9596 computeVerticalScrollOffset(), 9597 computeVerticalScrollExtent(), true); 9598 switch (mVerticalScrollbarPosition) { 9599 default: 9600 case SCROLLBAR_POSITION_DEFAULT: 9601 case SCROLLBAR_POSITION_RIGHT: 9602 left = scrollX + width - size - (mUserPaddingRight & inside); 9603 break; 9604 case SCROLLBAR_POSITION_LEFT: 9605 left = scrollX + (mUserPaddingLeft & inside); 9606 break; 9607 } 9608 top = scrollY + (mPaddingTop & inside); 9609 right = left + size; 9610 bottom = scrollY + height - (mUserPaddingBottom & inside); 9611 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 9612 if (invalidate) { 9613 invalidate(left, top, right, bottom); 9614 } 9615 } 9616 } 9617 } 9618 } 9619 9620 /** 9621 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 9622 * FastScroller is visible. 9623 * @return whether to temporarily hide the vertical scrollbar 9624 * @hide 9625 */ 9626 protected boolean isVerticalScrollBarHidden() { 9627 return false; 9628 } 9629 9630 /** 9631 * <p>Draw the horizontal scrollbar if 9632 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 9633 * 9634 * @param canvas the canvas on which to draw the scrollbar 9635 * @param scrollBar the scrollbar's drawable 9636 * 9637 * @see #isHorizontalScrollBarEnabled() 9638 * @see #computeHorizontalScrollRange() 9639 * @see #computeHorizontalScrollExtent() 9640 * @see #computeHorizontalScrollOffset() 9641 * @see android.widget.ScrollBarDrawable 9642 * @hide 9643 */ 9644 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 9645 int l, int t, int r, int b) { 9646 scrollBar.setBounds(l, t, r, b); 9647 scrollBar.draw(canvas); 9648 } 9649 9650 /** 9651 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 9652 * returns true.</p> 9653 * 9654 * @param canvas the canvas on which to draw the scrollbar 9655 * @param scrollBar the scrollbar's drawable 9656 * 9657 * @see #isVerticalScrollBarEnabled() 9658 * @see #computeVerticalScrollRange() 9659 * @see #computeVerticalScrollExtent() 9660 * @see #computeVerticalScrollOffset() 9661 * @see android.widget.ScrollBarDrawable 9662 * @hide 9663 */ 9664 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 9665 int l, int t, int r, int b) { 9666 scrollBar.setBounds(l, t, r, b); 9667 scrollBar.draw(canvas); 9668 } 9669 9670 /** 9671 * Implement this to do your drawing. 9672 * 9673 * @param canvas the canvas on which the background will be drawn 9674 */ 9675 protected void onDraw(Canvas canvas) { 9676 } 9677 9678 /* 9679 * Caller is responsible for calling requestLayout if necessary. 9680 * (This allows addViewInLayout to not request a new layout.) 9681 */ 9682 void assignParent(ViewParent parent) { 9683 if (mParent == null) { 9684 mParent = parent; 9685 } else if (parent == null) { 9686 mParent = null; 9687 } else { 9688 throw new RuntimeException("view " + this + " being added, but" 9689 + " it already has a parent"); 9690 } 9691 } 9692 9693 /** 9694 * This is called when the view is attached to a window. At this point it 9695 * has a Surface and will start drawing. Note that this function is 9696 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 9697 * however it may be called any time before the first onDraw -- including 9698 * before or after {@link #onMeasure(int, int)}. 9699 * 9700 * @see #onDetachedFromWindow() 9701 */ 9702 protected void onAttachedToWindow() { 9703 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 9704 mParent.requestTransparentRegion(this); 9705 } 9706 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 9707 initialAwakenScrollBars(); 9708 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 9709 } 9710 jumpDrawablesToCurrentState(); 9711 // Order is important here: LayoutDirection MUST be resolved before Padding 9712 // and TextDirection 9713 resolveLayoutDirectionIfNeeded(); 9714 resolvePadding(); 9715 resolveTextDirection(); 9716 if (isFocused()) { 9717 InputMethodManager imm = InputMethodManager.peekInstance(); 9718 imm.focusIn(this); 9719 } 9720 } 9721 9722 /** 9723 * @see #onScreenStateChanged(int) 9724 */ 9725 void dispatchScreenStateChanged(int screenState) { 9726 onScreenStateChanged(screenState); 9727 } 9728 9729 /** 9730 * This method is called whenever the state of the screen this view is 9731 * attached to changes. A state change will usually occurs when the screen 9732 * turns on or off (whether it happens automatically or the user does it 9733 * manually.) 9734 * 9735 * @param screenState The new state of the screen. Can be either 9736 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 9737 */ 9738 public void onScreenStateChanged(int screenState) { 9739 } 9740 9741 /** 9742 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 9743 * that the parent directionality can and will be resolved before its children. 9744 */ 9745 private void resolveLayoutDirectionIfNeeded() { 9746 // Do not resolve if it is not needed 9747 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return; 9748 9749 // Clear any previous layout direction resolution 9750 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 9751 9752 // Set resolved depending on layout direction 9753 switch (getLayoutDirection()) { 9754 case LAYOUT_DIRECTION_INHERIT: 9755 // We cannot do the resolution if there is no parent 9756 if (mParent == null) return; 9757 9758 // If this is root view, no need to look at parent's layout dir. 9759 if (mParent instanceof ViewGroup) { 9760 ViewGroup viewGroup = ((ViewGroup) mParent); 9761 9762 // Check if the parent view group can resolve 9763 if (! viewGroup.canResolveLayoutDirection()) { 9764 return; 9765 } 9766 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 9767 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9768 } 9769 } 9770 break; 9771 case LAYOUT_DIRECTION_RTL: 9772 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9773 break; 9774 case LAYOUT_DIRECTION_LOCALE: 9775 if(isLayoutDirectionRtl(Locale.getDefault())) { 9776 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9777 } 9778 break; 9779 default: 9780 // Nothing to do, LTR by default 9781 } 9782 9783 // Set to resolved 9784 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 9785 onResolvedLayoutDirectionChanged(); 9786 // Resolve padding 9787 resolvePadding(); 9788 } 9789 9790 /** 9791 * Called when layout direction has been resolved. 9792 * 9793 * The default implementation does nothing. 9794 */ 9795 public void onResolvedLayoutDirectionChanged() { 9796 } 9797 9798 /** 9799 * Resolve padding depending on layout direction. 9800 */ 9801 public void resolvePadding() { 9802 // If the user specified the absolute padding (either with android:padding or 9803 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 9804 // use the default padding or the padding from the background drawable 9805 // (stored at this point in mPadding*) 9806 int resolvedLayoutDirection = getResolvedLayoutDirection(); 9807 switch (resolvedLayoutDirection) { 9808 case LAYOUT_DIRECTION_RTL: 9809 // Start user padding override Right user padding. Otherwise, if Right user 9810 // padding is not defined, use the default Right padding. If Right user padding 9811 // is defined, just use it. 9812 if (mUserPaddingStart >= 0) { 9813 mUserPaddingRight = mUserPaddingStart; 9814 } else if (mUserPaddingRight < 0) { 9815 mUserPaddingRight = mPaddingRight; 9816 } 9817 if (mUserPaddingEnd >= 0) { 9818 mUserPaddingLeft = mUserPaddingEnd; 9819 } else if (mUserPaddingLeft < 0) { 9820 mUserPaddingLeft = mPaddingLeft; 9821 } 9822 break; 9823 case LAYOUT_DIRECTION_LTR: 9824 default: 9825 // Start user padding override Left user padding. Otherwise, if Left user 9826 // padding is not defined, use the default left padding. If Left user padding 9827 // is defined, just use it. 9828 if (mUserPaddingStart >= 0) { 9829 mUserPaddingLeft = mUserPaddingStart; 9830 } else if (mUserPaddingLeft < 0) { 9831 mUserPaddingLeft = mPaddingLeft; 9832 } 9833 if (mUserPaddingEnd >= 0) { 9834 mUserPaddingRight = mUserPaddingEnd; 9835 } else if (mUserPaddingRight < 0) { 9836 mUserPaddingRight = mPaddingRight; 9837 } 9838 } 9839 9840 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 9841 9842 if(isPaddingRelative()) { 9843 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 9844 } else { 9845 recomputePadding(); 9846 } 9847 onPaddingChanged(resolvedLayoutDirection); 9848 } 9849 9850 /** 9851 * Resolve padding depending on the layout direction. Subclasses that care about 9852 * padding resolution should override this method. The default implementation does 9853 * nothing. 9854 * 9855 * @param layoutDirection the direction of the layout 9856 * 9857 * @see {@link #LAYOUT_DIRECTION_LTR} 9858 * @see {@link #LAYOUT_DIRECTION_RTL} 9859 */ 9860 public void onPaddingChanged(int layoutDirection) { 9861 } 9862 9863 /** 9864 * Check if layout direction resolution can be done. 9865 * 9866 * @return true if layout direction resolution can be done otherwise return false. 9867 */ 9868 public boolean canResolveLayoutDirection() { 9869 switch (getLayoutDirection()) { 9870 case LAYOUT_DIRECTION_INHERIT: 9871 return (mParent != null); 9872 default: 9873 return true; 9874 } 9875 } 9876 9877 /** 9878 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 9879 * when reset is done. 9880 */ 9881 public void resetResolvedLayoutDirection() { 9882 // Reset the current resolved bits 9883 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 9884 onResolvedLayoutDirectionReset(); 9885 // Reset also the text direction 9886 resetResolvedTextDirection(); 9887 } 9888 9889 /** 9890 * Called during reset of resolved layout direction. 9891 * 9892 * Subclasses need to override this method to clear cached information that depends on the 9893 * resolved layout direction, or to inform child views that inherit their layout direction. 9894 * 9895 * The default implementation does nothing. 9896 */ 9897 public void onResolvedLayoutDirectionReset() { 9898 } 9899 9900 /** 9901 * Check if a Locale uses an RTL script. 9902 * 9903 * @param locale Locale to check 9904 * @return true if the Locale uses an RTL script. 9905 */ 9906 protected static boolean isLayoutDirectionRtl(Locale locale) { 9907 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 9908 } 9909 9910 /** 9911 * This is called when the view is detached from a window. At this point it 9912 * no longer has a surface for drawing. 9913 * 9914 * @see #onAttachedToWindow() 9915 */ 9916 protected void onDetachedFromWindow() { 9917 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 9918 9919 removeUnsetPressCallback(); 9920 removeLongPressCallback(); 9921 removePerformClickCallback(); 9922 removeSendViewScrolledAccessibilityEventCallback(); 9923 9924 destroyDrawingCache(); 9925 9926 destroyLayer(); 9927 9928 if (mDisplayList != null) { 9929 mDisplayList.invalidate(); 9930 } 9931 9932 if (mAttachInfo != null) { 9933 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 9934 } 9935 9936 mCurrentAnimation = null; 9937 9938 resetResolvedLayoutDirection(); 9939 } 9940 9941 /** 9942 * @return The number of times this view has been attached to a window 9943 */ 9944 protected int getWindowAttachCount() { 9945 return mWindowAttachCount; 9946 } 9947 9948 /** 9949 * Retrieve a unique token identifying the window this view is attached to. 9950 * @return Return the window's token for use in 9951 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 9952 */ 9953 public IBinder getWindowToken() { 9954 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 9955 } 9956 9957 /** 9958 * Retrieve a unique token identifying the top-level "real" window of 9959 * the window that this view is attached to. That is, this is like 9960 * {@link #getWindowToken}, except if the window this view in is a panel 9961 * window (attached to another containing window), then the token of 9962 * the containing window is returned instead. 9963 * 9964 * @return Returns the associated window token, either 9965 * {@link #getWindowToken()} or the containing window's token. 9966 */ 9967 public IBinder getApplicationWindowToken() { 9968 AttachInfo ai = mAttachInfo; 9969 if (ai != null) { 9970 IBinder appWindowToken = ai.mPanelParentWindowToken; 9971 if (appWindowToken == null) { 9972 appWindowToken = ai.mWindowToken; 9973 } 9974 return appWindowToken; 9975 } 9976 return null; 9977 } 9978 9979 /** 9980 * Retrieve private session object this view hierarchy is using to 9981 * communicate with the window manager. 9982 * @return the session object to communicate with the window manager 9983 */ 9984 /*package*/ IWindowSession getWindowSession() { 9985 return mAttachInfo != null ? mAttachInfo.mSession : null; 9986 } 9987 9988 /** 9989 * @param info the {@link android.view.View.AttachInfo} to associated with 9990 * this view 9991 */ 9992 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 9993 //System.out.println("Attached! " + this); 9994 mAttachInfo = info; 9995 mWindowAttachCount++; 9996 // We will need to evaluate the drawable state at least once. 9997 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9998 if (mFloatingTreeObserver != null) { 9999 info.mTreeObserver.merge(mFloatingTreeObserver); 10000 mFloatingTreeObserver = null; 10001 } 10002 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 10003 mAttachInfo.mScrollContainers.add(this); 10004 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 10005 } 10006 performCollectViewAttributes(visibility); 10007 onAttachedToWindow(); 10008 10009 ListenerInfo li = mListenerInfo; 10010 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 10011 li != null ? li.mOnAttachStateChangeListeners : null; 10012 if (listeners != null && listeners.size() > 0) { 10013 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 10014 // perform the dispatching. The iterator is a safe guard against listeners that 10015 // could mutate the list by calling the various add/remove methods. This prevents 10016 // the array from being modified while we iterate it. 10017 for (OnAttachStateChangeListener listener : listeners) { 10018 listener.onViewAttachedToWindow(this); 10019 } 10020 } 10021 10022 int vis = info.mWindowVisibility; 10023 if (vis != GONE) { 10024 onWindowVisibilityChanged(vis); 10025 } 10026 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 10027 // If nobody has evaluated the drawable state yet, then do it now. 10028 refreshDrawableState(); 10029 } 10030 } 10031 10032 void dispatchDetachedFromWindow() { 10033 AttachInfo info = mAttachInfo; 10034 if (info != null) { 10035 int vis = info.mWindowVisibility; 10036 if (vis != GONE) { 10037 onWindowVisibilityChanged(GONE); 10038 } 10039 } 10040 10041 onDetachedFromWindow(); 10042 10043 ListenerInfo li = mListenerInfo; 10044 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 10045 li != null ? li.mOnAttachStateChangeListeners : null; 10046 if (listeners != null && listeners.size() > 0) { 10047 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 10048 // perform the dispatching. The iterator is a safe guard against listeners that 10049 // could mutate the list by calling the various add/remove methods. This prevents 10050 // the array from being modified while we iterate it. 10051 for (OnAttachStateChangeListener listener : listeners) { 10052 listener.onViewDetachedFromWindow(this); 10053 } 10054 } 10055 10056 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 10057 mAttachInfo.mScrollContainers.remove(this); 10058 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 10059 } 10060 10061 mAttachInfo = null; 10062 } 10063 10064 /** 10065 * Store this view hierarchy's frozen state into the given container. 10066 * 10067 * @param container The SparseArray in which to save the view's state. 10068 * 10069 * @see #restoreHierarchyState(android.util.SparseArray) 10070 * @see #dispatchSaveInstanceState(android.util.SparseArray) 10071 * @see #onSaveInstanceState() 10072 */ 10073 public void saveHierarchyState(SparseArray<Parcelable> container) { 10074 dispatchSaveInstanceState(container); 10075 } 10076 10077 /** 10078 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 10079 * this view and its children. May be overridden to modify how freezing happens to a 10080 * view's children; for example, some views may want to not store state for their children. 10081 * 10082 * @param container The SparseArray in which to save the view's state. 10083 * 10084 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 10085 * @see #saveHierarchyState(android.util.SparseArray) 10086 * @see #onSaveInstanceState() 10087 */ 10088 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 10089 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 10090 mPrivateFlags &= ~SAVE_STATE_CALLED; 10091 Parcelable state = onSaveInstanceState(); 10092 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 10093 throw new IllegalStateException( 10094 "Derived class did not call super.onSaveInstanceState()"); 10095 } 10096 if (state != null) { 10097 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 10098 // + ": " + state); 10099 container.put(mID, state); 10100 } 10101 } 10102 } 10103 10104 /** 10105 * Hook allowing a view to generate a representation of its internal state 10106 * that can later be used to create a new instance with that same state. 10107 * This state should only contain information that is not persistent or can 10108 * not be reconstructed later. For example, you will never store your 10109 * current position on screen because that will be computed again when a 10110 * new instance of the view is placed in its view hierarchy. 10111 * <p> 10112 * Some examples of things you may store here: the current cursor position 10113 * in a text view (but usually not the text itself since that is stored in a 10114 * content provider or other persistent storage), the currently selected 10115 * item in a list view. 10116 * 10117 * @return Returns a Parcelable object containing the view's current dynamic 10118 * state, or null if there is nothing interesting to save. The 10119 * default implementation returns null. 10120 * @see #onRestoreInstanceState(android.os.Parcelable) 10121 * @see #saveHierarchyState(android.util.SparseArray) 10122 * @see #dispatchSaveInstanceState(android.util.SparseArray) 10123 * @see #setSaveEnabled(boolean) 10124 */ 10125 protected Parcelable onSaveInstanceState() { 10126 mPrivateFlags |= SAVE_STATE_CALLED; 10127 return BaseSavedState.EMPTY_STATE; 10128 } 10129 10130 /** 10131 * Restore this view hierarchy's frozen state from the given container. 10132 * 10133 * @param container The SparseArray which holds previously frozen states. 10134 * 10135 * @see #saveHierarchyState(android.util.SparseArray) 10136 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 10137 * @see #onRestoreInstanceState(android.os.Parcelable) 10138 */ 10139 public void restoreHierarchyState(SparseArray<Parcelable> container) { 10140 dispatchRestoreInstanceState(container); 10141 } 10142 10143 /** 10144 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 10145 * state for this view and its children. May be overridden to modify how restoring 10146 * happens to a view's children; for example, some views may want to not store state 10147 * for their children. 10148 * 10149 * @param container The SparseArray which holds previously saved state. 10150 * 10151 * @see #dispatchSaveInstanceState(android.util.SparseArray) 10152 * @see #restoreHierarchyState(android.util.SparseArray) 10153 * @see #onRestoreInstanceState(android.os.Parcelable) 10154 */ 10155 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 10156 if (mID != NO_ID) { 10157 Parcelable state = container.get(mID); 10158 if (state != null) { 10159 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 10160 // + ": " + state); 10161 mPrivateFlags &= ~SAVE_STATE_CALLED; 10162 onRestoreInstanceState(state); 10163 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 10164 throw new IllegalStateException( 10165 "Derived class did not call super.onRestoreInstanceState()"); 10166 } 10167 } 10168 } 10169 } 10170 10171 /** 10172 * Hook allowing a view to re-apply a representation of its internal state that had previously 10173 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 10174 * null state. 10175 * 10176 * @param state The frozen state that had previously been returned by 10177 * {@link #onSaveInstanceState}. 10178 * 10179 * @see #onSaveInstanceState() 10180 * @see #restoreHierarchyState(android.util.SparseArray) 10181 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 10182 */ 10183 protected void onRestoreInstanceState(Parcelable state) { 10184 mPrivateFlags |= SAVE_STATE_CALLED; 10185 if (state != BaseSavedState.EMPTY_STATE && state != null) { 10186 throw new IllegalArgumentException("Wrong state class, expecting View State but " 10187 + "received " + state.getClass().toString() + " instead. This usually happens " 10188 + "when two views of different type have the same id in the same hierarchy. " 10189 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 10190 + "other views do not use the same id."); 10191 } 10192 } 10193 10194 /** 10195 * <p>Return the time at which the drawing of the view hierarchy started.</p> 10196 * 10197 * @return the drawing start time in milliseconds 10198 */ 10199 public long getDrawingTime() { 10200 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 10201 } 10202 10203 /** 10204 * <p>Enables or disables the duplication of the parent's state into this view. When 10205 * duplication is enabled, this view gets its drawable state from its parent rather 10206 * than from its own internal properties.</p> 10207 * 10208 * <p>Note: in the current implementation, setting this property to true after the 10209 * view was added to a ViewGroup might have no effect at all. This property should 10210 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 10211 * 10212 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 10213 * property is enabled, an exception will be thrown.</p> 10214 * 10215 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 10216 * parent, these states should not be affected by this method.</p> 10217 * 10218 * @param enabled True to enable duplication of the parent's drawable state, false 10219 * to disable it. 10220 * 10221 * @see #getDrawableState() 10222 * @see #isDuplicateParentStateEnabled() 10223 */ 10224 public void setDuplicateParentStateEnabled(boolean enabled) { 10225 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 10226 } 10227 10228 /** 10229 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 10230 * 10231 * @return True if this view's drawable state is duplicated from the parent, 10232 * false otherwise 10233 * 10234 * @see #getDrawableState() 10235 * @see #setDuplicateParentStateEnabled(boolean) 10236 */ 10237 public boolean isDuplicateParentStateEnabled() { 10238 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 10239 } 10240 10241 /** 10242 * <p>Specifies the type of layer backing this view. The layer can be 10243 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 10244 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 10245 * 10246 * <p>A layer is associated with an optional {@link android.graphics.Paint} 10247 * instance that controls how the layer is composed on screen. The following 10248 * properties of the paint are taken into account when composing the layer:</p> 10249 * <ul> 10250 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 10251 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 10252 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 10253 * </ul> 10254 * 10255 * <p>If this view has an alpha value set to < 1.0 by calling 10256 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 10257 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 10258 * equivalent to setting a hardware layer on this view and providing a paint with 10259 * the desired alpha value.<p> 10260 * 10261 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 10262 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 10263 * for more information on when and how to use layers.</p> 10264 * 10265 * @param layerType The ype of layer to use with this view, must be one of 10266 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10267 * {@link #LAYER_TYPE_HARDWARE} 10268 * @param paint The paint used to compose the layer. This argument is optional 10269 * and can be null. It is ignored when the layer type is 10270 * {@link #LAYER_TYPE_NONE} 10271 * 10272 * @see #getLayerType() 10273 * @see #LAYER_TYPE_NONE 10274 * @see #LAYER_TYPE_SOFTWARE 10275 * @see #LAYER_TYPE_HARDWARE 10276 * @see #setAlpha(float) 10277 * 10278 * @attr ref android.R.styleable#View_layerType 10279 */ 10280 public void setLayerType(int layerType, Paint paint) { 10281 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 10282 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 10283 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 10284 } 10285 10286 if (layerType == mLayerType) { 10287 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 10288 mLayerPaint = paint == null ? new Paint() : paint; 10289 invalidateParentCaches(); 10290 invalidate(true); 10291 } 10292 return; 10293 } 10294 10295 // Destroy any previous software drawing cache if needed 10296 switch (mLayerType) { 10297 case LAYER_TYPE_HARDWARE: 10298 destroyLayer(); 10299 // fall through - non-accelerated views may use software layer mechanism instead 10300 case LAYER_TYPE_SOFTWARE: 10301 destroyDrawingCache(); 10302 break; 10303 default: 10304 break; 10305 } 10306 10307 mLayerType = layerType; 10308 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 10309 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 10310 mLocalDirtyRect = layerDisabled ? null : new Rect(); 10311 10312 invalidateParentCaches(); 10313 invalidate(true); 10314 } 10315 10316 /** 10317 * Indicates whether this view has a static layer. A view with layer type 10318 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 10319 * dynamic. 10320 */ 10321 boolean hasStaticLayer() { 10322 return true; 10323 } 10324 10325 /** 10326 * Indicates what type of layer is currently associated with this view. By default 10327 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 10328 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 10329 * for more information on the different types of layers. 10330 * 10331 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10332 * {@link #LAYER_TYPE_HARDWARE} 10333 * 10334 * @see #setLayerType(int, android.graphics.Paint) 10335 * @see #buildLayer() 10336 * @see #LAYER_TYPE_NONE 10337 * @see #LAYER_TYPE_SOFTWARE 10338 * @see #LAYER_TYPE_HARDWARE 10339 */ 10340 public int getLayerType() { 10341 return mLayerType; 10342 } 10343 10344 /** 10345 * Forces this view's layer to be created and this view to be rendered 10346 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 10347 * invoking this method will have no effect. 10348 * 10349 * This method can for instance be used to render a view into its layer before 10350 * starting an animation. If this view is complex, rendering into the layer 10351 * before starting the animation will avoid skipping frames. 10352 * 10353 * @throws IllegalStateException If this view is not attached to a window 10354 * 10355 * @see #setLayerType(int, android.graphics.Paint) 10356 */ 10357 public void buildLayer() { 10358 if (mLayerType == LAYER_TYPE_NONE) return; 10359 10360 if (mAttachInfo == null) { 10361 throw new IllegalStateException("This view must be attached to a window first"); 10362 } 10363 10364 switch (mLayerType) { 10365 case LAYER_TYPE_HARDWARE: 10366 if (mAttachInfo.mHardwareRenderer != null && 10367 mAttachInfo.mHardwareRenderer.isEnabled() && 10368 mAttachInfo.mHardwareRenderer.validate()) { 10369 getHardwareLayer(); 10370 } 10371 break; 10372 case LAYER_TYPE_SOFTWARE: 10373 buildDrawingCache(true); 10374 break; 10375 } 10376 } 10377 10378 // Make sure the HardwareRenderer.validate() was invoked before calling this method 10379 void flushLayer() { 10380 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 10381 mHardwareLayer.flush(); 10382 } 10383 } 10384 10385 /** 10386 * <p>Returns a hardware layer that can be used to draw this view again 10387 * without executing its draw method.</p> 10388 * 10389 * @return A HardwareLayer ready to render, or null if an error occurred. 10390 */ 10391 HardwareLayer getHardwareLayer() { 10392 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 10393 !mAttachInfo.mHardwareRenderer.isEnabled()) { 10394 return null; 10395 } 10396 10397 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 10398 10399 final int width = mRight - mLeft; 10400 final int height = mBottom - mTop; 10401 10402 if (width == 0 || height == 0) { 10403 return null; 10404 } 10405 10406 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 10407 if (mHardwareLayer == null) { 10408 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 10409 width, height, isOpaque()); 10410 mLocalDirtyRect.setEmpty(); 10411 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 10412 mHardwareLayer.resize(width, height); 10413 mLocalDirtyRect.setEmpty(); 10414 } 10415 10416 // The layer is not valid if the underlying GPU resources cannot be allocated 10417 if (!mHardwareLayer.isValid()) { 10418 return null; 10419 } 10420 10421 mHardwareLayer.redraw(getDisplayList(), mLocalDirtyRect); 10422 mLocalDirtyRect.setEmpty(); 10423 } 10424 10425 return mHardwareLayer; 10426 } 10427 10428 /** 10429 * Destroys this View's hardware layer if possible. 10430 * 10431 * @return True if the layer was destroyed, false otherwise. 10432 * 10433 * @see #setLayerType(int, android.graphics.Paint) 10434 * @see #LAYER_TYPE_HARDWARE 10435 */ 10436 boolean destroyLayer() { 10437 if (mHardwareLayer != null) { 10438 AttachInfo info = mAttachInfo; 10439 if (info != null && info.mHardwareRenderer != null && 10440 info.mHardwareRenderer.isEnabled() && info.mHardwareRenderer.validate()) { 10441 mHardwareLayer.destroy(); 10442 mHardwareLayer = null; 10443 10444 invalidate(true); 10445 invalidateParentCaches(); 10446 } 10447 return true; 10448 } 10449 return false; 10450 } 10451 10452 /** 10453 * Destroys all hardware rendering resources. This method is invoked 10454 * when the system needs to reclaim resources. Upon execution of this 10455 * method, you should free any OpenGL resources created by the view. 10456 * 10457 * Note: you <strong>must</strong> call 10458 * <code>super.destroyHardwareResources()</code> when overriding 10459 * this method. 10460 * 10461 * @hide 10462 */ 10463 protected void destroyHardwareResources() { 10464 destroyLayer(); 10465 } 10466 10467 /** 10468 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 10469 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 10470 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 10471 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 10472 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 10473 * null.</p> 10474 * 10475 * <p>Enabling the drawing cache is similar to 10476 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 10477 * acceleration is turned off. When hardware acceleration is turned on, enabling the 10478 * drawing cache has no effect on rendering because the system uses a different mechanism 10479 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 10480 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 10481 * for information on how to enable software and hardware layers.</p> 10482 * 10483 * <p>This API can be used to manually generate 10484 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 10485 * {@link #getDrawingCache()}.</p> 10486 * 10487 * @param enabled true to enable the drawing cache, false otherwise 10488 * 10489 * @see #isDrawingCacheEnabled() 10490 * @see #getDrawingCache() 10491 * @see #buildDrawingCache() 10492 * @see #setLayerType(int, android.graphics.Paint) 10493 */ 10494 public void setDrawingCacheEnabled(boolean enabled) { 10495 mCachingFailed = false; 10496 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 10497 } 10498 10499 /** 10500 * <p>Indicates whether the drawing cache is enabled for this view.</p> 10501 * 10502 * @return true if the drawing cache is enabled 10503 * 10504 * @see #setDrawingCacheEnabled(boolean) 10505 * @see #getDrawingCache() 10506 */ 10507 @ViewDebug.ExportedProperty(category = "drawing") 10508 public boolean isDrawingCacheEnabled() { 10509 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 10510 } 10511 10512 /** 10513 * Debugging utility which recursively outputs the dirty state of a view and its 10514 * descendants. 10515 * 10516 * @hide 10517 */ 10518 @SuppressWarnings({"UnusedDeclaration"}) 10519 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 10520 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 10521 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 10522 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 10523 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 10524 if (clear) { 10525 mPrivateFlags &= clearMask; 10526 } 10527 if (this instanceof ViewGroup) { 10528 ViewGroup parent = (ViewGroup) this; 10529 final int count = parent.getChildCount(); 10530 for (int i = 0; i < count; i++) { 10531 final View child = parent.getChildAt(i); 10532 child.outputDirtyFlags(indent + " ", clear, clearMask); 10533 } 10534 } 10535 } 10536 10537 /** 10538 * This method is used by ViewGroup to cause its children to restore or recreate their 10539 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 10540 * to recreate its own display list, which would happen if it went through the normal 10541 * draw/dispatchDraw mechanisms. 10542 * 10543 * @hide 10544 */ 10545 protected void dispatchGetDisplayList() {} 10546 10547 /** 10548 * A view that is not attached or hardware accelerated cannot create a display list. 10549 * This method checks these conditions and returns the appropriate result. 10550 * 10551 * @return true if view has the ability to create a display list, false otherwise. 10552 * 10553 * @hide 10554 */ 10555 public boolean canHaveDisplayList() { 10556 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 10557 } 10558 10559 /** 10560 * @return The HardwareRenderer associated with that view or null if hardware rendering 10561 * is not supported or this this has not been attached to a window. 10562 * 10563 * @hide 10564 */ 10565 public HardwareRenderer getHardwareRenderer() { 10566 if (mAttachInfo != null) { 10567 return mAttachInfo.mHardwareRenderer; 10568 } 10569 return null; 10570 } 10571 10572 /** 10573 * <p>Returns a display list that can be used to draw this view again 10574 * without executing its draw method.</p> 10575 * 10576 * @return A DisplayList ready to replay, or null if caching is not enabled. 10577 * 10578 * @hide 10579 */ 10580 public DisplayList getDisplayList() { 10581 if (!canHaveDisplayList()) { 10582 return null; 10583 } 10584 10585 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 10586 mDisplayList == null || !mDisplayList.isValid() || 10587 mRecreateDisplayList)) { 10588 // Don't need to recreate the display list, just need to tell our 10589 // children to restore/recreate theirs 10590 if (mDisplayList != null && mDisplayList.isValid() && 10591 !mRecreateDisplayList) { 10592 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10593 mPrivateFlags &= ~DIRTY_MASK; 10594 dispatchGetDisplayList(); 10595 10596 return mDisplayList; 10597 } 10598 10599 // If we got here, we're recreating it. Mark it as such to ensure that 10600 // we copy in child display lists into ours in drawChild() 10601 mRecreateDisplayList = true; 10602 if (mDisplayList == null) { 10603 final String name = getClass().getSimpleName(); 10604 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 10605 // If we're creating a new display list, make sure our parent gets invalidated 10606 // since they will need to recreate their display list to account for this 10607 // new child display list. 10608 invalidateParentCaches(); 10609 } 10610 10611 final HardwareCanvas canvas = mDisplayList.start(); 10612 int restoreCount = 0; 10613 try { 10614 int width = mRight - mLeft; 10615 int height = mBottom - mTop; 10616 10617 canvas.setViewport(width, height); 10618 // The dirty rect should always be null for a display list 10619 canvas.onPreDraw(null); 10620 10621 computeScroll(); 10622 10623 restoreCount = canvas.save(); 10624 canvas.translate(-mScrollX, -mScrollY); 10625 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10626 mPrivateFlags &= ~DIRTY_MASK; 10627 10628 // Fast path for layouts with no backgrounds 10629 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10630 dispatchDraw(canvas); 10631 } else { 10632 draw(canvas); 10633 } 10634 } finally { 10635 canvas.restoreToCount(restoreCount); 10636 canvas.onPostDraw(); 10637 10638 mDisplayList.end(); 10639 } 10640 } else { 10641 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10642 mPrivateFlags &= ~DIRTY_MASK; 10643 } 10644 10645 return mDisplayList; 10646 } 10647 10648 /** 10649 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 10650 * 10651 * @return A non-scaled bitmap representing this view or null if cache is disabled. 10652 * 10653 * @see #getDrawingCache(boolean) 10654 */ 10655 public Bitmap getDrawingCache() { 10656 return getDrawingCache(false); 10657 } 10658 10659 /** 10660 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 10661 * is null when caching is disabled. If caching is enabled and the cache is not ready, 10662 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 10663 * draw from the cache when the cache is enabled. To benefit from the cache, you must 10664 * request the drawing cache by calling this method and draw it on screen if the 10665 * returned bitmap is not null.</p> 10666 * 10667 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10668 * this method will create a bitmap of the same size as this view. Because this bitmap 10669 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10670 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10671 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10672 * size than the view. This implies that your application must be able to handle this 10673 * size.</p> 10674 * 10675 * @param autoScale Indicates whether the generated bitmap should be scaled based on 10676 * the current density of the screen when the application is in compatibility 10677 * mode. 10678 * 10679 * @return A bitmap representing this view or null if cache is disabled. 10680 * 10681 * @see #setDrawingCacheEnabled(boolean) 10682 * @see #isDrawingCacheEnabled() 10683 * @see #buildDrawingCache(boolean) 10684 * @see #destroyDrawingCache() 10685 */ 10686 public Bitmap getDrawingCache(boolean autoScale) { 10687 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 10688 return null; 10689 } 10690 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 10691 buildDrawingCache(autoScale); 10692 } 10693 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 10694 } 10695 10696 /** 10697 * <p>Frees the resources used by the drawing cache. If you call 10698 * {@link #buildDrawingCache()} manually without calling 10699 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10700 * should cleanup the cache with this method afterwards.</p> 10701 * 10702 * @see #setDrawingCacheEnabled(boolean) 10703 * @see #buildDrawingCache() 10704 * @see #getDrawingCache() 10705 */ 10706 public void destroyDrawingCache() { 10707 if (mDrawingCache != null) { 10708 mDrawingCache.recycle(); 10709 mDrawingCache = null; 10710 } 10711 if (mUnscaledDrawingCache != null) { 10712 mUnscaledDrawingCache.recycle(); 10713 mUnscaledDrawingCache = null; 10714 } 10715 } 10716 10717 /** 10718 * Setting a solid background color for the drawing cache's bitmaps will improve 10719 * performance and memory usage. Note, though that this should only be used if this 10720 * view will always be drawn on top of a solid color. 10721 * 10722 * @param color The background color to use for the drawing cache's bitmap 10723 * 10724 * @see #setDrawingCacheEnabled(boolean) 10725 * @see #buildDrawingCache() 10726 * @see #getDrawingCache() 10727 */ 10728 public void setDrawingCacheBackgroundColor(int color) { 10729 if (color != mDrawingCacheBackgroundColor) { 10730 mDrawingCacheBackgroundColor = color; 10731 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10732 } 10733 } 10734 10735 /** 10736 * @see #setDrawingCacheBackgroundColor(int) 10737 * 10738 * @return The background color to used for the drawing cache's bitmap 10739 */ 10740 public int getDrawingCacheBackgroundColor() { 10741 return mDrawingCacheBackgroundColor; 10742 } 10743 10744 /** 10745 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 10746 * 10747 * @see #buildDrawingCache(boolean) 10748 */ 10749 public void buildDrawingCache() { 10750 buildDrawingCache(false); 10751 } 10752 10753 /** 10754 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 10755 * 10756 * <p>If you call {@link #buildDrawingCache()} manually without calling 10757 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10758 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 10759 * 10760 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10761 * this method will create a bitmap of the same size as this view. Because this bitmap 10762 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10763 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10764 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10765 * size than the view. This implies that your application must be able to handle this 10766 * size.</p> 10767 * 10768 * <p>You should avoid calling this method when hardware acceleration is enabled. If 10769 * you do not need the drawing cache bitmap, calling this method will increase memory 10770 * usage and cause the view to be rendered in software once, thus negatively impacting 10771 * performance.</p> 10772 * 10773 * @see #getDrawingCache() 10774 * @see #destroyDrawingCache() 10775 */ 10776 public void buildDrawingCache(boolean autoScale) { 10777 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 10778 mDrawingCache == null : mUnscaledDrawingCache == null)) { 10779 mCachingFailed = false; 10780 10781 if (ViewDebug.TRACE_HIERARCHY) { 10782 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 10783 } 10784 10785 int width = mRight - mLeft; 10786 int height = mBottom - mTop; 10787 10788 final AttachInfo attachInfo = mAttachInfo; 10789 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 10790 10791 if (autoScale && scalingRequired) { 10792 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 10793 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 10794 } 10795 10796 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 10797 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 10798 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 10799 10800 if (width <= 0 || height <= 0 || 10801 // Projected bitmap size in bytes 10802 (width * height * (opaque && !use32BitCache ? 2 : 4) > 10803 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 10804 destroyDrawingCache(); 10805 mCachingFailed = true; 10806 return; 10807 } 10808 10809 boolean clear = true; 10810 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 10811 10812 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 10813 Bitmap.Config quality; 10814 if (!opaque) { 10815 // Never pick ARGB_4444 because it looks awful 10816 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 10817 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 10818 case DRAWING_CACHE_QUALITY_AUTO: 10819 quality = Bitmap.Config.ARGB_8888; 10820 break; 10821 case DRAWING_CACHE_QUALITY_LOW: 10822 quality = Bitmap.Config.ARGB_8888; 10823 break; 10824 case DRAWING_CACHE_QUALITY_HIGH: 10825 quality = Bitmap.Config.ARGB_8888; 10826 break; 10827 default: 10828 quality = Bitmap.Config.ARGB_8888; 10829 break; 10830 } 10831 } else { 10832 // Optimization for translucent windows 10833 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 10834 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 10835 } 10836 10837 // Try to cleanup memory 10838 if (bitmap != null) bitmap.recycle(); 10839 10840 try { 10841 bitmap = Bitmap.createBitmap(width, height, quality); 10842 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10843 if (autoScale) { 10844 mDrawingCache = bitmap; 10845 } else { 10846 mUnscaledDrawingCache = bitmap; 10847 } 10848 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 10849 } catch (OutOfMemoryError e) { 10850 // If there is not enough memory to create the bitmap cache, just 10851 // ignore the issue as bitmap caches are not required to draw the 10852 // view hierarchy 10853 if (autoScale) { 10854 mDrawingCache = null; 10855 } else { 10856 mUnscaledDrawingCache = null; 10857 } 10858 mCachingFailed = true; 10859 return; 10860 } 10861 10862 clear = drawingCacheBackgroundColor != 0; 10863 } 10864 10865 Canvas canvas; 10866 if (attachInfo != null) { 10867 canvas = attachInfo.mCanvas; 10868 if (canvas == null) { 10869 canvas = new Canvas(); 10870 } 10871 canvas.setBitmap(bitmap); 10872 // Temporarily clobber the cached Canvas in case one of our children 10873 // is also using a drawing cache. Without this, the children would 10874 // steal the canvas by attaching their own bitmap to it and bad, bad 10875 // thing would happen (invisible views, corrupted drawings, etc.) 10876 attachInfo.mCanvas = null; 10877 } else { 10878 // This case should hopefully never or seldom happen 10879 canvas = new Canvas(bitmap); 10880 } 10881 10882 if (clear) { 10883 bitmap.eraseColor(drawingCacheBackgroundColor); 10884 } 10885 10886 computeScroll(); 10887 final int restoreCount = canvas.save(); 10888 10889 if (autoScale && scalingRequired) { 10890 final float scale = attachInfo.mApplicationScale; 10891 canvas.scale(scale, scale); 10892 } 10893 10894 canvas.translate(-mScrollX, -mScrollY); 10895 10896 mPrivateFlags |= DRAWN; 10897 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 10898 mLayerType != LAYER_TYPE_NONE) { 10899 mPrivateFlags |= DRAWING_CACHE_VALID; 10900 } 10901 10902 // Fast path for layouts with no backgrounds 10903 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10904 if (ViewDebug.TRACE_HIERARCHY) { 10905 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10906 } 10907 mPrivateFlags &= ~DIRTY_MASK; 10908 dispatchDraw(canvas); 10909 } else { 10910 draw(canvas); 10911 } 10912 10913 canvas.restoreToCount(restoreCount); 10914 canvas.setBitmap(null); 10915 10916 if (attachInfo != null) { 10917 // Restore the cached Canvas for our siblings 10918 attachInfo.mCanvas = canvas; 10919 } 10920 } 10921 } 10922 10923 /** 10924 * Create a snapshot of the view into a bitmap. We should probably make 10925 * some form of this public, but should think about the API. 10926 */ 10927 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 10928 int width = mRight - mLeft; 10929 int height = mBottom - mTop; 10930 10931 final AttachInfo attachInfo = mAttachInfo; 10932 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 10933 width = (int) ((width * scale) + 0.5f); 10934 height = (int) ((height * scale) + 0.5f); 10935 10936 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 10937 if (bitmap == null) { 10938 throw new OutOfMemoryError(); 10939 } 10940 10941 Resources resources = getResources(); 10942 if (resources != null) { 10943 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 10944 } 10945 10946 Canvas canvas; 10947 if (attachInfo != null) { 10948 canvas = attachInfo.mCanvas; 10949 if (canvas == null) { 10950 canvas = new Canvas(); 10951 } 10952 canvas.setBitmap(bitmap); 10953 // Temporarily clobber the cached Canvas in case one of our children 10954 // is also using a drawing cache. Without this, the children would 10955 // steal the canvas by attaching their own bitmap to it and bad, bad 10956 // things would happen (invisible views, corrupted drawings, etc.) 10957 attachInfo.mCanvas = null; 10958 } else { 10959 // This case should hopefully never or seldom happen 10960 canvas = new Canvas(bitmap); 10961 } 10962 10963 if ((backgroundColor & 0xff000000) != 0) { 10964 bitmap.eraseColor(backgroundColor); 10965 } 10966 10967 computeScroll(); 10968 final int restoreCount = canvas.save(); 10969 canvas.scale(scale, scale); 10970 canvas.translate(-mScrollX, -mScrollY); 10971 10972 // Temporarily remove the dirty mask 10973 int flags = mPrivateFlags; 10974 mPrivateFlags &= ~DIRTY_MASK; 10975 10976 // Fast path for layouts with no backgrounds 10977 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10978 dispatchDraw(canvas); 10979 } else { 10980 draw(canvas); 10981 } 10982 10983 mPrivateFlags = flags; 10984 10985 canvas.restoreToCount(restoreCount); 10986 canvas.setBitmap(null); 10987 10988 if (attachInfo != null) { 10989 // Restore the cached Canvas for our siblings 10990 attachInfo.mCanvas = canvas; 10991 } 10992 10993 return bitmap; 10994 } 10995 10996 /** 10997 * Indicates whether this View is currently in edit mode. A View is usually 10998 * in edit mode when displayed within a developer tool. For instance, if 10999 * this View is being drawn by a visual user interface builder, this method 11000 * should return true. 11001 * 11002 * Subclasses should check the return value of this method to provide 11003 * different behaviors if their normal behavior might interfere with the 11004 * host environment. For instance: the class spawns a thread in its 11005 * constructor, the drawing code relies on device-specific features, etc. 11006 * 11007 * This method is usually checked in the drawing code of custom widgets. 11008 * 11009 * @return True if this View is in edit mode, false otherwise. 11010 */ 11011 public boolean isInEditMode() { 11012 return false; 11013 } 11014 11015 /** 11016 * If the View draws content inside its padding and enables fading edges, 11017 * it needs to support padding offsets. Padding offsets are added to the 11018 * fading edges to extend the length of the fade so that it covers pixels 11019 * drawn inside the padding. 11020 * 11021 * Subclasses of this class should override this method if they need 11022 * to draw content inside the padding. 11023 * 11024 * @return True if padding offset must be applied, false otherwise. 11025 * 11026 * @see #getLeftPaddingOffset() 11027 * @see #getRightPaddingOffset() 11028 * @see #getTopPaddingOffset() 11029 * @see #getBottomPaddingOffset() 11030 * 11031 * @since CURRENT 11032 */ 11033 protected boolean isPaddingOffsetRequired() { 11034 return false; 11035 } 11036 11037 /** 11038 * Amount by which to extend the left fading region. Called only when 11039 * {@link #isPaddingOffsetRequired()} returns true. 11040 * 11041 * @return The left padding offset in pixels. 11042 * 11043 * @see #isPaddingOffsetRequired() 11044 * 11045 * @since CURRENT 11046 */ 11047 protected int getLeftPaddingOffset() { 11048 return 0; 11049 } 11050 11051 /** 11052 * Amount by which to extend the right fading region. Called only when 11053 * {@link #isPaddingOffsetRequired()} returns true. 11054 * 11055 * @return The right padding offset in pixels. 11056 * 11057 * @see #isPaddingOffsetRequired() 11058 * 11059 * @since CURRENT 11060 */ 11061 protected int getRightPaddingOffset() { 11062 return 0; 11063 } 11064 11065 /** 11066 * Amount by which to extend the top fading region. Called only when 11067 * {@link #isPaddingOffsetRequired()} returns true. 11068 * 11069 * @return The top padding offset in pixels. 11070 * 11071 * @see #isPaddingOffsetRequired() 11072 * 11073 * @since CURRENT 11074 */ 11075 protected int getTopPaddingOffset() { 11076 return 0; 11077 } 11078 11079 /** 11080 * Amount by which to extend the bottom fading region. Called only when 11081 * {@link #isPaddingOffsetRequired()} returns true. 11082 * 11083 * @return The bottom padding offset in pixels. 11084 * 11085 * @see #isPaddingOffsetRequired() 11086 * 11087 * @since CURRENT 11088 */ 11089 protected int getBottomPaddingOffset() { 11090 return 0; 11091 } 11092 11093 /** 11094 * @hide 11095 * @param offsetRequired 11096 */ 11097 protected int getFadeTop(boolean offsetRequired) { 11098 int top = mPaddingTop; 11099 if (offsetRequired) top += getTopPaddingOffset(); 11100 return top; 11101 } 11102 11103 /** 11104 * @hide 11105 * @param offsetRequired 11106 */ 11107 protected int getFadeHeight(boolean offsetRequired) { 11108 int padding = mPaddingTop; 11109 if (offsetRequired) padding += getTopPaddingOffset(); 11110 return mBottom - mTop - mPaddingBottom - padding; 11111 } 11112 11113 /** 11114 * <p>Indicates whether this view is attached to a hardware accelerated 11115 * window or not.</p> 11116 * 11117 * <p>Even if this method returns true, it does not mean that every call 11118 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 11119 * accelerated {@link android.graphics.Canvas}. For instance, if this view 11120 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 11121 * window is hardware accelerated, 11122 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 11123 * return false, and this method will return true.</p> 11124 * 11125 * @return True if the view is attached to a window and the window is 11126 * hardware accelerated; false in any other case. 11127 */ 11128 public boolean isHardwareAccelerated() { 11129 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 11130 } 11131 11132 /** 11133 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 11134 * case of an active Animation being run on the view. 11135 */ 11136 private boolean drawAnimation(ViewGroup parent, long drawingTime, 11137 Animation a, boolean scalingRequired) { 11138 Transformation invalidationTransform; 11139 final int flags = parent.mGroupFlags; 11140 final boolean initialized = a.isInitialized(); 11141 if (!initialized) { 11142 a.initialize(mRight - mLeft, mBottom - mTop, getWidth(), getHeight()); 11143 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 11144 onAnimationStart(); 11145 } 11146 11147 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 11148 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 11149 if (parent.mInvalidationTransformation == null) { 11150 parent.mInvalidationTransformation = new Transformation(); 11151 } 11152 invalidationTransform = parent.mInvalidationTransformation; 11153 a.getTransformation(drawingTime, invalidationTransform, 1f); 11154 } else { 11155 invalidationTransform = parent.mChildTransformation; 11156 } 11157 if (more) { 11158 if (!a.willChangeBounds()) { 11159 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 11160 parent.FLAG_OPTIMIZE_INVALIDATE) { 11161 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 11162 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 11163 // The child need to draw an animation, potentially offscreen, so 11164 // make sure we do not cancel invalidate requests 11165 parent.mPrivateFlags |= DRAW_ANIMATION; 11166 parent.invalidate(mLeft, mTop, mRight, mBottom); 11167 } 11168 } else { 11169 if (parent.mInvalidateRegion == null) { 11170 parent.mInvalidateRegion = new RectF(); 11171 } 11172 final RectF region = parent.mInvalidateRegion; 11173 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 11174 invalidationTransform); 11175 11176 // The child need to draw an animation, potentially offscreen, so 11177 // make sure we do not cancel invalidate requests 11178 parent.mPrivateFlags |= DRAW_ANIMATION; 11179 11180 final int left = mLeft + (int) region.left; 11181 final int top = mTop + (int) region.top; 11182 parent.invalidate(left, top, left + (int) (region.width() + .5f), 11183 top + (int) (region.height() + .5f)); 11184 } 11185 } 11186 return more; 11187 } 11188 11189 /** 11190 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 11191 * This draw() method is an implementation detail and is not intended to be overridden or 11192 * to be called from anywhere else other than ViewGroup.drawChild(). 11193 */ 11194 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 11195 boolean more = false; 11196 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 11197 final int flags = parent.mGroupFlags; 11198 11199 if ((flags & parent.FLAG_CLEAR_TRANSFORMATION) == parent.FLAG_CLEAR_TRANSFORMATION) { 11200 parent.mChildTransformation.clear(); 11201 parent.mGroupFlags &= ~parent.FLAG_CLEAR_TRANSFORMATION; 11202 } 11203 11204 Transformation transformToApply = null; 11205 boolean concatMatrix = false; 11206 11207 boolean scalingRequired = false; 11208 boolean caching; 11209 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 11210 11211 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 11212 if ((flags & parent.FLAG_CHILDREN_DRAWN_WITH_CACHE) == parent.FLAG_CHILDREN_DRAWN_WITH_CACHE || 11213 (flags & parent.FLAG_ALWAYS_DRAWN_WITH_CACHE) == parent.FLAG_ALWAYS_DRAWN_WITH_CACHE) { 11214 caching = true; 11215 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 11216 } else { 11217 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 11218 } 11219 11220 final Animation a = getAnimation(); 11221 if (a != null) { 11222 more = drawAnimation(parent, drawingTime, a, scalingRequired); 11223 concatMatrix = a.willChangeTransformationMatrix(); 11224 transformToApply = parent.mChildTransformation; 11225 } else if ((flags & parent.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) == 11226 parent.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) { 11227 final boolean hasTransform = 11228 parent.getChildStaticTransformation(this, parent.mChildTransformation); 11229 if (hasTransform) { 11230 final int transformType = parent.mChildTransformation.getTransformationType(); 11231 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 11232 parent.mChildTransformation : null; 11233 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 11234 } 11235 } 11236 11237 concatMatrix |= !childHasIdentityMatrix; 11238 11239 // Sets the flag as early as possible to allow draw() implementations 11240 // to call invalidate() successfully when doing animations 11241 mPrivateFlags |= DRAWN; 11242 11243 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 11244 (mPrivateFlags & DRAW_ANIMATION) == 0) { 11245 return more; 11246 } 11247 11248 if (hardwareAccelerated) { 11249 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 11250 // retain the flag's value temporarily in the mRecreateDisplayList flag 11251 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 11252 mPrivateFlags &= ~INVALIDATED; 11253 } 11254 11255 computeScroll(); 11256 11257 final int sx = mScrollX; 11258 final int sy = mScrollY; 11259 11260 DisplayList displayList = null; 11261 Bitmap cache = null; 11262 boolean hasDisplayList = false; 11263 if (caching) { 11264 if (!hardwareAccelerated) { 11265 if (layerType != LAYER_TYPE_NONE) { 11266 layerType = LAYER_TYPE_SOFTWARE; 11267 buildDrawingCache(true); 11268 } 11269 cache = getDrawingCache(true); 11270 } else { 11271 switch (layerType) { 11272 case LAYER_TYPE_SOFTWARE: 11273 buildDrawingCache(true); 11274 cache = getDrawingCache(true); 11275 break; 11276 case LAYER_TYPE_NONE: 11277 // Delay getting the display list until animation-driven alpha values are 11278 // set up and possibly passed on to the view 11279 hasDisplayList = canHaveDisplayList(); 11280 break; 11281 } 11282 } 11283 } 11284 11285 final boolean hasNoCache = cache == null || hasDisplayList; 11286 final boolean offsetForScroll = cache == null && !hasDisplayList && 11287 layerType != LAYER_TYPE_HARDWARE; 11288 11289 final int restoreTo = canvas.save(); 11290 if (offsetForScroll) { 11291 canvas.translate(mLeft - sx, mTop - sy); 11292 } else { 11293 canvas.translate(mLeft, mTop); 11294 if (scalingRequired) { 11295 // mAttachInfo cannot be null, otherwise scalingRequired == false 11296 final float scale = 1.0f / mAttachInfo.mApplicationScale; 11297 canvas.scale(scale, scale); 11298 } 11299 } 11300 11301 float alpha = getAlpha(); 11302 if (transformToApply != null || alpha < 1.0f || !hasIdentityMatrix()) { 11303 if (transformToApply != null || !childHasIdentityMatrix) { 11304 int transX = 0; 11305 int transY = 0; 11306 11307 if (offsetForScroll) { 11308 transX = -sx; 11309 transY = -sy; 11310 } 11311 11312 if (transformToApply != null) { 11313 if (concatMatrix) { 11314 // Undo the scroll translation, apply the transformation matrix, 11315 // then redo the scroll translate to get the correct result. 11316 canvas.translate(-transX, -transY); 11317 canvas.concat(transformToApply.getMatrix()); 11318 canvas.translate(transX, transY); 11319 parent.mGroupFlags |= parent.FLAG_CLEAR_TRANSFORMATION; 11320 } 11321 11322 float transformAlpha = transformToApply.getAlpha(); 11323 if (transformAlpha < 1.0f) { 11324 alpha *= transformToApply.getAlpha(); 11325 parent.mGroupFlags |= parent.FLAG_CLEAR_TRANSFORMATION; 11326 } 11327 } 11328 11329 if (!childHasIdentityMatrix) { 11330 canvas.translate(-transX, -transY); 11331 canvas.concat(getMatrix()); 11332 canvas.translate(transX, transY); 11333 } 11334 } 11335 11336 if (alpha < 1.0f) { 11337 parent.mGroupFlags |= parent.FLAG_CLEAR_TRANSFORMATION; 11338 if (hasNoCache) { 11339 final int multipliedAlpha = (int) (255 * alpha); 11340 if (!onSetAlpha(multipliedAlpha)) { 11341 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 11342 if ((flags & parent.FLAG_CLIP_CHILDREN) == parent.FLAG_CLIP_CHILDREN || 11343 layerType != LAYER_TYPE_NONE) { 11344 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 11345 } 11346 if (layerType == LAYER_TYPE_NONE) { 11347 final int scrollX = hasDisplayList ? 0 : sx; 11348 final int scrollY = hasDisplayList ? 0 : sy; 11349 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 11350 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 11351 } 11352 } else { 11353 // Alpha is handled by the child directly, clobber the layer's alpha 11354 mPrivateFlags |= ALPHA_SET; 11355 } 11356 } 11357 } 11358 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 11359 onSetAlpha(255); 11360 mPrivateFlags &= ~ALPHA_SET; 11361 } 11362 11363 if ((flags & parent.FLAG_CLIP_CHILDREN) == parent.FLAG_CLIP_CHILDREN) { 11364 if (offsetForScroll) { 11365 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 11366 } else { 11367 if (!scalingRequired || cache == null) { 11368 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 11369 } else { 11370 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 11371 } 11372 } 11373 } 11374 11375 if (hasDisplayList) { 11376 displayList = getDisplayList(); 11377 if (!displayList.isValid()) { 11378 // Uncommon, but possible. If a view is removed from the hierarchy during the call 11379 // to getDisplayList(), the display list will be marked invalid and we should not 11380 // try to use it again. 11381 displayList = null; 11382 hasDisplayList = false; 11383 } 11384 } 11385 11386 if (hasNoCache) { 11387 boolean layerRendered = false; 11388 if (layerType == LAYER_TYPE_HARDWARE) { 11389 final HardwareLayer layer = getHardwareLayer(); 11390 if (layer != null && layer.isValid()) { 11391 mLayerPaint.setAlpha((int) (alpha * 255)); 11392 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 11393 layerRendered = true; 11394 } else { 11395 final int scrollX = hasDisplayList ? 0 : sx; 11396 final int scrollY = hasDisplayList ? 0 : sy; 11397 canvas.saveLayer(scrollX, scrollY, 11398 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 11399 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 11400 } 11401 } 11402 11403 if (!layerRendered) { 11404 if (!hasDisplayList) { 11405 // Fast path for layouts with no backgrounds 11406 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 11407 if (ViewDebug.TRACE_HIERARCHY) { 11408 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 11409 } 11410 mPrivateFlags &= ~DIRTY_MASK; 11411 dispatchDraw(canvas); 11412 } else { 11413 draw(canvas); 11414 } 11415 } else { 11416 mPrivateFlags &= ~DIRTY_MASK; 11417 ((HardwareCanvas) canvas).drawDisplayList(displayList, 11418 mRight - mLeft, mBottom - mTop, null, flags); 11419 } 11420 } 11421 } else if (cache != null) { 11422 mPrivateFlags &= ~DIRTY_MASK; 11423 Paint cachePaint; 11424 11425 if (layerType == LAYER_TYPE_NONE) { 11426 cachePaint = parent.mCachePaint; 11427 if (cachePaint == null) { 11428 cachePaint = new Paint(); 11429 cachePaint.setDither(false); 11430 parent.mCachePaint = cachePaint; 11431 } 11432 if (alpha < 1.0f) { 11433 cachePaint.setAlpha((int) (alpha * 255)); 11434 parent.mGroupFlags |= parent.FLAG_ALPHA_LOWER_THAN_ONE; 11435 } else if ((flags & parent.FLAG_ALPHA_LOWER_THAN_ONE) == 11436 parent.FLAG_ALPHA_LOWER_THAN_ONE) { 11437 cachePaint.setAlpha(255); 11438 parent.mGroupFlags &= ~parent.FLAG_ALPHA_LOWER_THAN_ONE; 11439 } 11440 } else { 11441 cachePaint = mLayerPaint; 11442 cachePaint.setAlpha((int) (alpha * 255)); 11443 } 11444 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 11445 } 11446 11447 canvas.restoreToCount(restoreTo); 11448 11449 if (a != null && !more) { 11450 if (!hardwareAccelerated && !a.getFillAfter()) { 11451 onSetAlpha(255); 11452 } 11453 parent.finishAnimatingView(this, a); 11454 } 11455 11456 if (more && hardwareAccelerated) { 11457 // invalidation is the trigger to recreate display lists, so if we're using 11458 // display lists to render, force an invalidate to allow the animation to 11459 // continue drawing another frame 11460 parent.invalidate(true); 11461 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 11462 // alpha animations should cause the child to recreate its display list 11463 invalidate(true); 11464 } 11465 } 11466 11467 mRecreateDisplayList = false; 11468 11469 return more; 11470 } 11471 11472 /** 11473 * Manually render this view (and all of its children) to the given Canvas. 11474 * The view must have already done a full layout before this function is 11475 * called. When implementing a view, implement 11476 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 11477 * If you do need to override this method, call the superclass version. 11478 * 11479 * @param canvas The Canvas to which the View is rendered. 11480 */ 11481 public void draw(Canvas canvas) { 11482 if (ViewDebug.TRACE_HIERARCHY) { 11483 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 11484 } 11485 11486 final int privateFlags = mPrivateFlags; 11487 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 11488 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 11489 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 11490 11491 /* 11492 * Draw traversal performs several drawing steps which must be executed 11493 * in the appropriate order: 11494 * 11495 * 1. Draw the background 11496 * 2. If necessary, save the canvas' layers to prepare for fading 11497 * 3. Draw view's content 11498 * 4. Draw children 11499 * 5. If necessary, draw the fading edges and restore layers 11500 * 6. Draw decorations (scrollbars for instance) 11501 */ 11502 11503 // Step 1, draw the background, if needed 11504 int saveCount; 11505 11506 if (!dirtyOpaque) { 11507 final Drawable background = mBGDrawable; 11508 if (background != null) { 11509 final int scrollX = mScrollX; 11510 final int scrollY = mScrollY; 11511 11512 if (mBackgroundSizeChanged) { 11513 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 11514 mBackgroundSizeChanged = false; 11515 } 11516 11517 if ((scrollX | scrollY) == 0) { 11518 background.draw(canvas); 11519 } else { 11520 canvas.translate(scrollX, scrollY); 11521 background.draw(canvas); 11522 canvas.translate(-scrollX, -scrollY); 11523 } 11524 } 11525 } 11526 11527 // skip step 2 & 5 if possible (common case) 11528 final int viewFlags = mViewFlags; 11529 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 11530 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 11531 if (!verticalEdges && !horizontalEdges) { 11532 // Step 3, draw the content 11533 if (!dirtyOpaque) onDraw(canvas); 11534 11535 // Step 4, draw the children 11536 dispatchDraw(canvas); 11537 11538 // Step 6, draw decorations (scrollbars) 11539 onDrawScrollBars(canvas); 11540 11541 // we're done... 11542 return; 11543 } 11544 11545 /* 11546 * Here we do the full fledged routine... 11547 * (this is an uncommon case where speed matters less, 11548 * this is why we repeat some of the tests that have been 11549 * done above) 11550 */ 11551 11552 boolean drawTop = false; 11553 boolean drawBottom = false; 11554 boolean drawLeft = false; 11555 boolean drawRight = false; 11556 11557 float topFadeStrength = 0.0f; 11558 float bottomFadeStrength = 0.0f; 11559 float leftFadeStrength = 0.0f; 11560 float rightFadeStrength = 0.0f; 11561 11562 // Step 2, save the canvas' layers 11563 int paddingLeft = mPaddingLeft; 11564 11565 final boolean offsetRequired = isPaddingOffsetRequired(); 11566 if (offsetRequired) { 11567 paddingLeft += getLeftPaddingOffset(); 11568 } 11569 11570 int left = mScrollX + paddingLeft; 11571 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 11572 int top = mScrollY + getFadeTop(offsetRequired); 11573 int bottom = top + getFadeHeight(offsetRequired); 11574 11575 if (offsetRequired) { 11576 right += getRightPaddingOffset(); 11577 bottom += getBottomPaddingOffset(); 11578 } 11579 11580 final ScrollabilityCache scrollabilityCache = mScrollCache; 11581 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 11582 int length = (int) fadeHeight; 11583 11584 // clip the fade length if top and bottom fades overlap 11585 // overlapping fades produce odd-looking artifacts 11586 if (verticalEdges && (top + length > bottom - length)) { 11587 length = (bottom - top) / 2; 11588 } 11589 11590 // also clip horizontal fades if necessary 11591 if (horizontalEdges && (left + length > right - length)) { 11592 length = (right - left) / 2; 11593 } 11594 11595 if (verticalEdges) { 11596 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 11597 drawTop = topFadeStrength * fadeHeight > 1.0f; 11598 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 11599 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 11600 } 11601 11602 if (horizontalEdges) { 11603 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 11604 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 11605 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 11606 drawRight = rightFadeStrength * fadeHeight > 1.0f; 11607 } 11608 11609 saveCount = canvas.getSaveCount(); 11610 11611 int solidColor = getSolidColor(); 11612 if (solidColor == 0) { 11613 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 11614 11615 if (drawTop) { 11616 canvas.saveLayer(left, top, right, top + length, null, flags); 11617 } 11618 11619 if (drawBottom) { 11620 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 11621 } 11622 11623 if (drawLeft) { 11624 canvas.saveLayer(left, top, left + length, bottom, null, flags); 11625 } 11626 11627 if (drawRight) { 11628 canvas.saveLayer(right - length, top, right, bottom, null, flags); 11629 } 11630 } else { 11631 scrollabilityCache.setFadeColor(solidColor); 11632 } 11633 11634 // Step 3, draw the content 11635 if (!dirtyOpaque) onDraw(canvas); 11636 11637 // Step 4, draw the children 11638 dispatchDraw(canvas); 11639 11640 // Step 5, draw the fade effect and restore layers 11641 final Paint p = scrollabilityCache.paint; 11642 final Matrix matrix = scrollabilityCache.matrix; 11643 final Shader fade = scrollabilityCache.shader; 11644 11645 if (drawTop) { 11646 matrix.setScale(1, fadeHeight * topFadeStrength); 11647 matrix.postTranslate(left, top); 11648 fade.setLocalMatrix(matrix); 11649 canvas.drawRect(left, top, right, top + length, p); 11650 } 11651 11652 if (drawBottom) { 11653 matrix.setScale(1, fadeHeight * bottomFadeStrength); 11654 matrix.postRotate(180); 11655 matrix.postTranslate(left, bottom); 11656 fade.setLocalMatrix(matrix); 11657 canvas.drawRect(left, bottom - length, right, bottom, p); 11658 } 11659 11660 if (drawLeft) { 11661 matrix.setScale(1, fadeHeight * leftFadeStrength); 11662 matrix.postRotate(-90); 11663 matrix.postTranslate(left, top); 11664 fade.setLocalMatrix(matrix); 11665 canvas.drawRect(left, top, left + length, bottom, p); 11666 } 11667 11668 if (drawRight) { 11669 matrix.setScale(1, fadeHeight * rightFadeStrength); 11670 matrix.postRotate(90); 11671 matrix.postTranslate(right, top); 11672 fade.setLocalMatrix(matrix); 11673 canvas.drawRect(right - length, top, right, bottom, p); 11674 } 11675 11676 canvas.restoreToCount(saveCount); 11677 11678 // Step 6, draw decorations (scrollbars) 11679 onDrawScrollBars(canvas); 11680 } 11681 11682 /** 11683 * Override this if your view is known to always be drawn on top of a solid color background, 11684 * and needs to draw fading edges. Returning a non-zero color enables the view system to 11685 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 11686 * should be set to 0xFF. 11687 * 11688 * @see #setVerticalFadingEdgeEnabled(boolean) 11689 * @see #setHorizontalFadingEdgeEnabled(boolean) 11690 * 11691 * @return The known solid color background for this view, or 0 if the color may vary 11692 */ 11693 @ViewDebug.ExportedProperty(category = "drawing") 11694 public int getSolidColor() { 11695 return 0; 11696 } 11697 11698 /** 11699 * Build a human readable string representation of the specified view flags. 11700 * 11701 * @param flags the view flags to convert to a string 11702 * @return a String representing the supplied flags 11703 */ 11704 private static String printFlags(int flags) { 11705 String output = ""; 11706 int numFlags = 0; 11707 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 11708 output += "TAKES_FOCUS"; 11709 numFlags++; 11710 } 11711 11712 switch (flags & VISIBILITY_MASK) { 11713 case INVISIBLE: 11714 if (numFlags > 0) { 11715 output += " "; 11716 } 11717 output += "INVISIBLE"; 11718 // USELESS HERE numFlags++; 11719 break; 11720 case GONE: 11721 if (numFlags > 0) { 11722 output += " "; 11723 } 11724 output += "GONE"; 11725 // USELESS HERE numFlags++; 11726 break; 11727 default: 11728 break; 11729 } 11730 return output; 11731 } 11732 11733 /** 11734 * Build a human readable string representation of the specified private 11735 * view flags. 11736 * 11737 * @param privateFlags the private view flags to convert to a string 11738 * @return a String representing the supplied flags 11739 */ 11740 private static String printPrivateFlags(int privateFlags) { 11741 String output = ""; 11742 int numFlags = 0; 11743 11744 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 11745 output += "WANTS_FOCUS"; 11746 numFlags++; 11747 } 11748 11749 if ((privateFlags & FOCUSED) == FOCUSED) { 11750 if (numFlags > 0) { 11751 output += " "; 11752 } 11753 output += "FOCUSED"; 11754 numFlags++; 11755 } 11756 11757 if ((privateFlags & SELECTED) == SELECTED) { 11758 if (numFlags > 0) { 11759 output += " "; 11760 } 11761 output += "SELECTED"; 11762 numFlags++; 11763 } 11764 11765 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 11766 if (numFlags > 0) { 11767 output += " "; 11768 } 11769 output += "IS_ROOT_NAMESPACE"; 11770 numFlags++; 11771 } 11772 11773 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 11774 if (numFlags > 0) { 11775 output += " "; 11776 } 11777 output += "HAS_BOUNDS"; 11778 numFlags++; 11779 } 11780 11781 if ((privateFlags & DRAWN) == DRAWN) { 11782 if (numFlags > 0) { 11783 output += " "; 11784 } 11785 output += "DRAWN"; 11786 // USELESS HERE numFlags++; 11787 } 11788 return output; 11789 } 11790 11791 /** 11792 * <p>Indicates whether or not this view's layout will be requested during 11793 * the next hierarchy layout pass.</p> 11794 * 11795 * @return true if the layout will be forced during next layout pass 11796 */ 11797 public boolean isLayoutRequested() { 11798 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 11799 } 11800 11801 /** 11802 * Assign a size and position to a view and all of its 11803 * descendants 11804 * 11805 * <p>This is the second phase of the layout mechanism. 11806 * (The first is measuring). In this phase, each parent calls 11807 * layout on all of its children to position them. 11808 * This is typically done using the child measurements 11809 * that were stored in the measure pass().</p> 11810 * 11811 * <p>Derived classes should not override this method. 11812 * Derived classes with children should override 11813 * onLayout. In that method, they should 11814 * call layout on each of their children.</p> 11815 * 11816 * @param l Left position, relative to parent 11817 * @param t Top position, relative to parent 11818 * @param r Right position, relative to parent 11819 * @param b Bottom position, relative to parent 11820 */ 11821 @SuppressWarnings({"unchecked"}) 11822 public void layout(int l, int t, int r, int b) { 11823 int oldL = mLeft; 11824 int oldT = mTop; 11825 int oldB = mBottom; 11826 int oldR = mRight; 11827 boolean changed = setFrame(l, t, r, b); 11828 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 11829 if (ViewDebug.TRACE_HIERARCHY) { 11830 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 11831 } 11832 11833 onLayout(changed, l, t, r, b); 11834 mPrivateFlags &= ~LAYOUT_REQUIRED; 11835 11836 ListenerInfo li = mListenerInfo; 11837 if (li != null && li.mOnLayoutChangeListeners != null) { 11838 ArrayList<OnLayoutChangeListener> listenersCopy = 11839 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 11840 int numListeners = listenersCopy.size(); 11841 for (int i = 0; i < numListeners; ++i) { 11842 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 11843 } 11844 } 11845 } 11846 mPrivateFlags &= ~FORCE_LAYOUT; 11847 } 11848 11849 /** 11850 * Called from layout when this view should 11851 * assign a size and position to each of its children. 11852 * 11853 * Derived classes with children should override 11854 * this method and call layout on each of 11855 * their children. 11856 * @param changed This is a new size or position for this view 11857 * @param left Left position, relative to parent 11858 * @param top Top position, relative to parent 11859 * @param right Right position, relative to parent 11860 * @param bottom Bottom position, relative to parent 11861 */ 11862 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 11863 } 11864 11865 /** 11866 * Assign a size and position to this view. 11867 * 11868 * This is called from layout. 11869 * 11870 * @param left Left position, relative to parent 11871 * @param top Top position, relative to parent 11872 * @param right Right position, relative to parent 11873 * @param bottom Bottom position, relative to parent 11874 * @return true if the new size and position are different than the 11875 * previous ones 11876 * {@hide} 11877 */ 11878 protected boolean setFrame(int left, int top, int right, int bottom) { 11879 boolean changed = false; 11880 11881 if (DBG) { 11882 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 11883 + right + "," + bottom + ")"); 11884 } 11885 11886 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 11887 changed = true; 11888 11889 // Remember our drawn bit 11890 int drawn = mPrivateFlags & DRAWN; 11891 11892 int oldWidth = mRight - mLeft; 11893 int oldHeight = mBottom - mTop; 11894 int newWidth = right - left; 11895 int newHeight = bottom - top; 11896 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 11897 11898 // Invalidate our old position 11899 invalidate(sizeChanged); 11900 11901 mLeft = left; 11902 mTop = top; 11903 mRight = right; 11904 mBottom = bottom; 11905 11906 mPrivateFlags |= HAS_BOUNDS; 11907 11908 11909 if (sizeChanged) { 11910 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 11911 // A change in dimension means an auto-centered pivot point changes, too 11912 if (mTransformationInfo != null) { 11913 mTransformationInfo.mMatrixDirty = true; 11914 } 11915 } 11916 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 11917 } 11918 11919 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 11920 // If we are visible, force the DRAWN bit to on so that 11921 // this invalidate will go through (at least to our parent). 11922 // This is because someone may have invalidated this view 11923 // before this call to setFrame came in, thereby clearing 11924 // the DRAWN bit. 11925 mPrivateFlags |= DRAWN; 11926 invalidate(sizeChanged); 11927 // parent display list may need to be recreated based on a change in the bounds 11928 // of any child 11929 invalidateParentCaches(); 11930 } 11931 11932 // Reset drawn bit to original value (invalidate turns it off) 11933 mPrivateFlags |= drawn; 11934 11935 mBackgroundSizeChanged = true; 11936 } 11937 return changed; 11938 } 11939 11940 /** 11941 * Finalize inflating a view from XML. This is called as the last phase 11942 * of inflation, after all child views have been added. 11943 * 11944 * <p>Even if the subclass overrides onFinishInflate, they should always be 11945 * sure to call the super method, so that we get called. 11946 */ 11947 protected void onFinishInflate() { 11948 } 11949 11950 /** 11951 * Returns the resources associated with this view. 11952 * 11953 * @return Resources object. 11954 */ 11955 public Resources getResources() { 11956 return mResources; 11957 } 11958 11959 /** 11960 * Invalidates the specified Drawable. 11961 * 11962 * @param drawable the drawable to invalidate 11963 */ 11964 public void invalidateDrawable(Drawable drawable) { 11965 if (verifyDrawable(drawable)) { 11966 final Rect dirty = drawable.getBounds(); 11967 final int scrollX = mScrollX; 11968 final int scrollY = mScrollY; 11969 11970 invalidate(dirty.left + scrollX, dirty.top + scrollY, 11971 dirty.right + scrollX, dirty.bottom + scrollY); 11972 } 11973 } 11974 11975 /** 11976 * Schedules an action on a drawable to occur at a specified time. 11977 * 11978 * @param who the recipient of the action 11979 * @param what the action to run on the drawable 11980 * @param when the time at which the action must occur. Uses the 11981 * {@link SystemClock#uptimeMillis} timebase. 11982 */ 11983 public void scheduleDrawable(Drawable who, Runnable what, long when) { 11984 if (verifyDrawable(who) && what != null) { 11985 final long delay = when - SystemClock.uptimeMillis(); 11986 if (mAttachInfo != null) { 11987 mAttachInfo.mViewRootImpl.mChoreographer.postAnimationCallbackDelayed( 11988 what, who, Choreographer.subtractFrameDelay(delay)); 11989 } else { 11990 ViewRootImpl.getRunQueue().postDelayed(what, delay); 11991 } 11992 } 11993 } 11994 11995 /** 11996 * Cancels a scheduled action on a drawable. 11997 * 11998 * @param who the recipient of the action 11999 * @param what the action to cancel 12000 */ 12001 public void unscheduleDrawable(Drawable who, Runnable what) { 12002 if (verifyDrawable(who) && what != null) { 12003 if (mAttachInfo != null) { 12004 mAttachInfo.mViewRootImpl.mChoreographer.removeAnimationCallbacks(what, who); 12005 } else { 12006 ViewRootImpl.getRunQueue().removeCallbacks(what); 12007 } 12008 } 12009 } 12010 12011 /** 12012 * Unschedule any events associated with the given Drawable. This can be 12013 * used when selecting a new Drawable into a view, so that the previous 12014 * one is completely unscheduled. 12015 * 12016 * @param who The Drawable to unschedule. 12017 * 12018 * @see #drawableStateChanged 12019 */ 12020 public void unscheduleDrawable(Drawable who) { 12021 if (mAttachInfo != null && who != null) { 12022 mAttachInfo.mViewRootImpl.mChoreographer.removeAnimationCallbacks(null, who); 12023 } 12024 } 12025 12026 /** 12027 * Return the layout direction of a given Drawable. 12028 * 12029 * @param who the Drawable to query 12030 */ 12031 public int getResolvedLayoutDirection(Drawable who) { 12032 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 12033 } 12034 12035 /** 12036 * If your view subclass is displaying its own Drawable objects, it should 12037 * override this function and return true for any Drawable it is 12038 * displaying. This allows animations for those drawables to be 12039 * scheduled. 12040 * 12041 * <p>Be sure to call through to the super class when overriding this 12042 * function. 12043 * 12044 * @param who The Drawable to verify. Return true if it is one you are 12045 * displaying, else return the result of calling through to the 12046 * super class. 12047 * 12048 * @return boolean If true than the Drawable is being displayed in the 12049 * view; else false and it is not allowed to animate. 12050 * 12051 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 12052 * @see #drawableStateChanged() 12053 */ 12054 protected boolean verifyDrawable(Drawable who) { 12055 return who == mBGDrawable; 12056 } 12057 12058 /** 12059 * This function is called whenever the state of the view changes in such 12060 * a way that it impacts the state of drawables being shown. 12061 * 12062 * <p>Be sure to call through to the superclass when overriding this 12063 * function. 12064 * 12065 * @see Drawable#setState(int[]) 12066 */ 12067 protected void drawableStateChanged() { 12068 Drawable d = mBGDrawable; 12069 if (d != null && d.isStateful()) { 12070 d.setState(getDrawableState()); 12071 } 12072 } 12073 12074 /** 12075 * Call this to force a view to update its drawable state. This will cause 12076 * drawableStateChanged to be called on this view. Views that are interested 12077 * in the new state should call getDrawableState. 12078 * 12079 * @see #drawableStateChanged 12080 * @see #getDrawableState 12081 */ 12082 public void refreshDrawableState() { 12083 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 12084 drawableStateChanged(); 12085 12086 ViewParent parent = mParent; 12087 if (parent != null) { 12088 parent.childDrawableStateChanged(this); 12089 } 12090 } 12091 12092 /** 12093 * Return an array of resource IDs of the drawable states representing the 12094 * current state of the view. 12095 * 12096 * @return The current drawable state 12097 * 12098 * @see Drawable#setState(int[]) 12099 * @see #drawableStateChanged() 12100 * @see #onCreateDrawableState(int) 12101 */ 12102 public final int[] getDrawableState() { 12103 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 12104 return mDrawableState; 12105 } else { 12106 mDrawableState = onCreateDrawableState(0); 12107 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 12108 return mDrawableState; 12109 } 12110 } 12111 12112 /** 12113 * Generate the new {@link android.graphics.drawable.Drawable} state for 12114 * this view. This is called by the view 12115 * system when the cached Drawable state is determined to be invalid. To 12116 * retrieve the current state, you should use {@link #getDrawableState}. 12117 * 12118 * @param extraSpace if non-zero, this is the number of extra entries you 12119 * would like in the returned array in which you can place your own 12120 * states. 12121 * 12122 * @return Returns an array holding the current {@link Drawable} state of 12123 * the view. 12124 * 12125 * @see #mergeDrawableStates(int[], int[]) 12126 */ 12127 protected int[] onCreateDrawableState(int extraSpace) { 12128 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 12129 mParent instanceof View) { 12130 return ((View) mParent).onCreateDrawableState(extraSpace); 12131 } 12132 12133 int[] drawableState; 12134 12135 int privateFlags = mPrivateFlags; 12136 12137 int viewStateIndex = 0; 12138 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 12139 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 12140 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 12141 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 12142 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 12143 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 12144 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 12145 HardwareRenderer.isAvailable()) { 12146 // This is set if HW acceleration is requested, even if the current 12147 // process doesn't allow it. This is just to allow app preview 12148 // windows to better match their app. 12149 viewStateIndex |= VIEW_STATE_ACCELERATED; 12150 } 12151 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 12152 12153 final int privateFlags2 = mPrivateFlags2; 12154 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 12155 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 12156 12157 drawableState = VIEW_STATE_SETS[viewStateIndex]; 12158 12159 //noinspection ConstantIfStatement 12160 if (false) { 12161 Log.i("View", "drawableStateIndex=" + viewStateIndex); 12162 Log.i("View", toString() 12163 + " pressed=" + ((privateFlags & PRESSED) != 0) 12164 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 12165 + " fo=" + hasFocus() 12166 + " sl=" + ((privateFlags & SELECTED) != 0) 12167 + " wf=" + hasWindowFocus() 12168 + ": " + Arrays.toString(drawableState)); 12169 } 12170 12171 if (extraSpace == 0) { 12172 return drawableState; 12173 } 12174 12175 final int[] fullState; 12176 if (drawableState != null) { 12177 fullState = new int[drawableState.length + extraSpace]; 12178 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 12179 } else { 12180 fullState = new int[extraSpace]; 12181 } 12182 12183 return fullState; 12184 } 12185 12186 /** 12187 * Merge your own state values in <var>additionalState</var> into the base 12188 * state values <var>baseState</var> that were returned by 12189 * {@link #onCreateDrawableState(int)}. 12190 * 12191 * @param baseState The base state values returned by 12192 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 12193 * own additional state values. 12194 * 12195 * @param additionalState The additional state values you would like 12196 * added to <var>baseState</var>; this array is not modified. 12197 * 12198 * @return As a convenience, the <var>baseState</var> array you originally 12199 * passed into the function is returned. 12200 * 12201 * @see #onCreateDrawableState(int) 12202 */ 12203 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 12204 final int N = baseState.length; 12205 int i = N - 1; 12206 while (i >= 0 && baseState[i] == 0) { 12207 i--; 12208 } 12209 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 12210 return baseState; 12211 } 12212 12213 /** 12214 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 12215 * on all Drawable objects associated with this view. 12216 */ 12217 public void jumpDrawablesToCurrentState() { 12218 if (mBGDrawable != null) { 12219 mBGDrawable.jumpToCurrentState(); 12220 } 12221 } 12222 12223 /** 12224 * Sets the background color for this view. 12225 * @param color the color of the background 12226 */ 12227 @RemotableViewMethod 12228 public void setBackgroundColor(int color) { 12229 if (mBGDrawable instanceof ColorDrawable) { 12230 ((ColorDrawable) mBGDrawable).setColor(color); 12231 } else { 12232 setBackgroundDrawable(new ColorDrawable(color)); 12233 } 12234 } 12235 12236 /** 12237 * Set the background to a given resource. The resource should refer to 12238 * a Drawable object or 0 to remove the background. 12239 * @param resid The identifier of the resource. 12240 * @attr ref android.R.styleable#View_background 12241 */ 12242 @RemotableViewMethod 12243 public void setBackgroundResource(int resid) { 12244 if (resid != 0 && resid == mBackgroundResource) { 12245 return; 12246 } 12247 12248 Drawable d= null; 12249 if (resid != 0) { 12250 d = mResources.getDrawable(resid); 12251 } 12252 setBackgroundDrawable(d); 12253 12254 mBackgroundResource = resid; 12255 } 12256 12257 /** 12258 * Set the background to a given Drawable, or remove the background. If the 12259 * background has padding, this View's padding is set to the background's 12260 * padding. However, when a background is removed, this View's padding isn't 12261 * touched. If setting the padding is desired, please use 12262 * {@link #setPadding(int, int, int, int)}. 12263 * 12264 * @param d The Drawable to use as the background, or null to remove the 12265 * background 12266 */ 12267 public void setBackgroundDrawable(Drawable d) { 12268 if (d == mBGDrawable) { 12269 return; 12270 } 12271 12272 boolean requestLayout = false; 12273 12274 mBackgroundResource = 0; 12275 12276 /* 12277 * Regardless of whether we're setting a new background or not, we want 12278 * to clear the previous drawable. 12279 */ 12280 if (mBGDrawable != null) { 12281 mBGDrawable.setCallback(null); 12282 unscheduleDrawable(mBGDrawable); 12283 } 12284 12285 if (d != null) { 12286 Rect padding = sThreadLocal.get(); 12287 if (padding == null) { 12288 padding = new Rect(); 12289 sThreadLocal.set(padding); 12290 } 12291 if (d.getPadding(padding)) { 12292 switch (d.getResolvedLayoutDirectionSelf()) { 12293 case LAYOUT_DIRECTION_RTL: 12294 setPadding(padding.right, padding.top, padding.left, padding.bottom); 12295 break; 12296 case LAYOUT_DIRECTION_LTR: 12297 default: 12298 setPadding(padding.left, padding.top, padding.right, padding.bottom); 12299 } 12300 } 12301 12302 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 12303 // if it has a different minimum size, we should layout again 12304 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 12305 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 12306 requestLayout = true; 12307 } 12308 12309 d.setCallback(this); 12310 if (d.isStateful()) { 12311 d.setState(getDrawableState()); 12312 } 12313 d.setVisible(getVisibility() == VISIBLE, false); 12314 mBGDrawable = d; 12315 12316 if ((mPrivateFlags & SKIP_DRAW) != 0) { 12317 mPrivateFlags &= ~SKIP_DRAW; 12318 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 12319 requestLayout = true; 12320 } 12321 } else { 12322 /* Remove the background */ 12323 mBGDrawable = null; 12324 12325 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 12326 /* 12327 * This view ONLY drew the background before and we're removing 12328 * the background, so now it won't draw anything 12329 * (hence we SKIP_DRAW) 12330 */ 12331 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 12332 mPrivateFlags |= SKIP_DRAW; 12333 } 12334 12335 /* 12336 * When the background is set, we try to apply its padding to this 12337 * View. When the background is removed, we don't touch this View's 12338 * padding. This is noted in the Javadocs. Hence, we don't need to 12339 * requestLayout(), the invalidate() below is sufficient. 12340 */ 12341 12342 // The old background's minimum size could have affected this 12343 // View's layout, so let's requestLayout 12344 requestLayout = true; 12345 } 12346 12347 computeOpaqueFlags(); 12348 12349 if (requestLayout) { 12350 requestLayout(); 12351 } 12352 12353 mBackgroundSizeChanged = true; 12354 invalidate(true); 12355 } 12356 12357 /** 12358 * Gets the background drawable 12359 * @return The drawable used as the background for this view, if any. 12360 */ 12361 public Drawable getBackground() { 12362 return mBGDrawable; 12363 } 12364 12365 /** 12366 * Sets the padding. The view may add on the space required to display 12367 * the scrollbars, depending on the style and visibility of the scrollbars. 12368 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 12369 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 12370 * from the values set in this call. 12371 * 12372 * @attr ref android.R.styleable#View_padding 12373 * @attr ref android.R.styleable#View_paddingBottom 12374 * @attr ref android.R.styleable#View_paddingLeft 12375 * @attr ref android.R.styleable#View_paddingRight 12376 * @attr ref android.R.styleable#View_paddingTop 12377 * @param left the left padding in pixels 12378 * @param top the top padding in pixels 12379 * @param right the right padding in pixels 12380 * @param bottom the bottom padding in pixels 12381 */ 12382 public void setPadding(int left, int top, int right, int bottom) { 12383 mUserPaddingStart = -1; 12384 mUserPaddingEnd = -1; 12385 mUserPaddingRelative = false; 12386 12387 internalSetPadding(left, top, right, bottom); 12388 } 12389 12390 private void internalSetPadding(int left, int top, int right, int bottom) { 12391 mUserPaddingLeft = left; 12392 mUserPaddingRight = right; 12393 mUserPaddingBottom = bottom; 12394 12395 final int viewFlags = mViewFlags; 12396 boolean changed = false; 12397 12398 // Common case is there are no scroll bars. 12399 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 12400 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 12401 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 12402 ? 0 : getVerticalScrollbarWidth(); 12403 switch (mVerticalScrollbarPosition) { 12404 case SCROLLBAR_POSITION_DEFAULT: 12405 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 12406 left += offset; 12407 } else { 12408 right += offset; 12409 } 12410 break; 12411 case SCROLLBAR_POSITION_RIGHT: 12412 right += offset; 12413 break; 12414 case SCROLLBAR_POSITION_LEFT: 12415 left += offset; 12416 break; 12417 } 12418 } 12419 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 12420 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 12421 ? 0 : getHorizontalScrollbarHeight(); 12422 } 12423 } 12424 12425 if (mPaddingLeft != left) { 12426 changed = true; 12427 mPaddingLeft = left; 12428 } 12429 if (mPaddingTop != top) { 12430 changed = true; 12431 mPaddingTop = top; 12432 } 12433 if (mPaddingRight != right) { 12434 changed = true; 12435 mPaddingRight = right; 12436 } 12437 if (mPaddingBottom != bottom) { 12438 changed = true; 12439 mPaddingBottom = bottom; 12440 } 12441 12442 if (changed) { 12443 requestLayout(); 12444 } 12445 } 12446 12447 /** 12448 * Sets the relative padding. The view may add on the space required to display 12449 * the scrollbars, depending on the style and visibility of the scrollbars. 12450 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 12451 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 12452 * from the values set in this call. 12453 * 12454 * @attr ref android.R.styleable#View_padding 12455 * @attr ref android.R.styleable#View_paddingBottom 12456 * @attr ref android.R.styleable#View_paddingStart 12457 * @attr ref android.R.styleable#View_paddingEnd 12458 * @attr ref android.R.styleable#View_paddingTop 12459 * @param start the start padding in pixels 12460 * @param top the top padding in pixels 12461 * @param end the end padding in pixels 12462 * @param bottom the bottom padding in pixels 12463 */ 12464 public void setPaddingRelative(int start, int top, int end, int bottom) { 12465 mUserPaddingStart = start; 12466 mUserPaddingEnd = end; 12467 mUserPaddingRelative = true; 12468 12469 switch(getResolvedLayoutDirection()) { 12470 case LAYOUT_DIRECTION_RTL: 12471 internalSetPadding(end, top, start, bottom); 12472 break; 12473 case LAYOUT_DIRECTION_LTR: 12474 default: 12475 internalSetPadding(start, top, end, bottom); 12476 } 12477 } 12478 12479 /** 12480 * Returns the top padding of this view. 12481 * 12482 * @return the top padding in pixels 12483 */ 12484 public int getPaddingTop() { 12485 return mPaddingTop; 12486 } 12487 12488 /** 12489 * Returns the bottom padding of this view. If there are inset and enabled 12490 * scrollbars, this value may include the space required to display the 12491 * scrollbars as well. 12492 * 12493 * @return the bottom padding in pixels 12494 */ 12495 public int getPaddingBottom() { 12496 return mPaddingBottom; 12497 } 12498 12499 /** 12500 * Returns the left padding of this view. If there are inset and enabled 12501 * scrollbars, this value may include the space required to display the 12502 * scrollbars as well. 12503 * 12504 * @return the left padding in pixels 12505 */ 12506 public int getPaddingLeft() { 12507 return mPaddingLeft; 12508 } 12509 12510 /** 12511 * Returns the start padding of this view. If there are inset and enabled 12512 * scrollbars, this value may include the space required to display the 12513 * scrollbars as well. 12514 * 12515 * @return the start padding in pixels 12516 */ 12517 public int getPaddingStart() { 12518 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 12519 mPaddingRight : mPaddingLeft; 12520 } 12521 12522 /** 12523 * Returns the right padding of this view. If there are inset and enabled 12524 * scrollbars, this value may include the space required to display the 12525 * scrollbars as well. 12526 * 12527 * @return the right padding in pixels 12528 */ 12529 public int getPaddingRight() { 12530 return mPaddingRight; 12531 } 12532 12533 /** 12534 * Returns the end padding of this view. If there are inset and enabled 12535 * scrollbars, this value may include the space required to display the 12536 * scrollbars as well. 12537 * 12538 * @return the end padding in pixels 12539 */ 12540 public int getPaddingEnd() { 12541 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 12542 mPaddingLeft : mPaddingRight; 12543 } 12544 12545 /** 12546 * Return if the padding as been set thru relative values 12547 * {@link #setPaddingRelative(int, int, int, int)} or thru 12548 * @attr ref android.R.styleable#View_paddingStart or 12549 * @attr ref android.R.styleable#View_paddingEnd 12550 * 12551 * @return true if the padding is relative or false if it is not. 12552 */ 12553 public boolean isPaddingRelative() { 12554 return mUserPaddingRelative; 12555 } 12556 12557 /** 12558 * Changes the selection state of this view. A view can be selected or not. 12559 * Note that selection is not the same as focus. Views are typically 12560 * selected in the context of an AdapterView like ListView or GridView; 12561 * the selected view is the view that is highlighted. 12562 * 12563 * @param selected true if the view must be selected, false otherwise 12564 */ 12565 public void setSelected(boolean selected) { 12566 if (((mPrivateFlags & SELECTED) != 0) != selected) { 12567 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 12568 if (!selected) resetPressedState(); 12569 invalidate(true); 12570 refreshDrawableState(); 12571 dispatchSetSelected(selected); 12572 } 12573 } 12574 12575 /** 12576 * Dispatch setSelected to all of this View's children. 12577 * 12578 * @see #setSelected(boolean) 12579 * 12580 * @param selected The new selected state 12581 */ 12582 protected void dispatchSetSelected(boolean selected) { 12583 } 12584 12585 /** 12586 * Indicates the selection state of this view. 12587 * 12588 * @return true if the view is selected, false otherwise 12589 */ 12590 @ViewDebug.ExportedProperty 12591 public boolean isSelected() { 12592 return (mPrivateFlags & SELECTED) != 0; 12593 } 12594 12595 /** 12596 * Changes the activated state of this view. A view can be activated or not. 12597 * Note that activation is not the same as selection. Selection is 12598 * a transient property, representing the view (hierarchy) the user is 12599 * currently interacting with. Activation is a longer-term state that the 12600 * user can move views in and out of. For example, in a list view with 12601 * single or multiple selection enabled, the views in the current selection 12602 * set are activated. (Um, yeah, we are deeply sorry about the terminology 12603 * here.) The activated state is propagated down to children of the view it 12604 * is set on. 12605 * 12606 * @param activated true if the view must be activated, false otherwise 12607 */ 12608 public void setActivated(boolean activated) { 12609 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 12610 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 12611 invalidate(true); 12612 refreshDrawableState(); 12613 dispatchSetActivated(activated); 12614 } 12615 } 12616 12617 /** 12618 * Dispatch setActivated to all of this View's children. 12619 * 12620 * @see #setActivated(boolean) 12621 * 12622 * @param activated The new activated state 12623 */ 12624 protected void dispatchSetActivated(boolean activated) { 12625 } 12626 12627 /** 12628 * Indicates the activation state of this view. 12629 * 12630 * @return true if the view is activated, false otherwise 12631 */ 12632 @ViewDebug.ExportedProperty 12633 public boolean isActivated() { 12634 return (mPrivateFlags & ACTIVATED) != 0; 12635 } 12636 12637 /** 12638 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 12639 * observer can be used to get notifications when global events, like 12640 * layout, happen. 12641 * 12642 * The returned ViewTreeObserver observer is not guaranteed to remain 12643 * valid for the lifetime of this View. If the caller of this method keeps 12644 * a long-lived reference to ViewTreeObserver, it should always check for 12645 * the return value of {@link ViewTreeObserver#isAlive()}. 12646 * 12647 * @return The ViewTreeObserver for this view's hierarchy. 12648 */ 12649 public ViewTreeObserver getViewTreeObserver() { 12650 if (mAttachInfo != null) { 12651 return mAttachInfo.mTreeObserver; 12652 } 12653 if (mFloatingTreeObserver == null) { 12654 mFloatingTreeObserver = new ViewTreeObserver(); 12655 } 12656 return mFloatingTreeObserver; 12657 } 12658 12659 /** 12660 * <p>Finds the topmost view in the current view hierarchy.</p> 12661 * 12662 * @return the topmost view containing this view 12663 */ 12664 public View getRootView() { 12665 if (mAttachInfo != null) { 12666 final View v = mAttachInfo.mRootView; 12667 if (v != null) { 12668 return v; 12669 } 12670 } 12671 12672 View parent = this; 12673 12674 while (parent.mParent != null && parent.mParent instanceof View) { 12675 parent = (View) parent.mParent; 12676 } 12677 12678 return parent; 12679 } 12680 12681 /** 12682 * <p>Computes the coordinates of this view on the screen. The argument 12683 * must be an array of two integers. After the method returns, the array 12684 * contains the x and y location in that order.</p> 12685 * 12686 * @param location an array of two integers in which to hold the coordinates 12687 */ 12688 public void getLocationOnScreen(int[] location) { 12689 getLocationInWindow(location); 12690 12691 final AttachInfo info = mAttachInfo; 12692 if (info != null) { 12693 location[0] += info.mWindowLeft; 12694 location[1] += info.mWindowTop; 12695 } 12696 } 12697 12698 /** 12699 * <p>Computes the coordinates of this view in its window. The argument 12700 * must be an array of two integers. After the method returns, the array 12701 * contains the x and y location in that order.</p> 12702 * 12703 * @param location an array of two integers in which to hold the coordinates 12704 */ 12705 public void getLocationInWindow(int[] location) { 12706 if (location == null || location.length < 2) { 12707 throw new IllegalArgumentException("location must be an array of two integers"); 12708 } 12709 12710 if (mAttachInfo == null) { 12711 // When the view is not attached to a window, this method does not make sense 12712 location[0] = location[1] = 0; 12713 return; 12714 } 12715 12716 float[] position = mAttachInfo.mTmpTransformLocation; 12717 position[0] = position[1] = 0.0f; 12718 12719 if (!hasIdentityMatrix()) { 12720 getMatrix().mapPoints(position); 12721 } 12722 12723 position[0] += mLeft; 12724 position[1] += mTop; 12725 12726 ViewParent viewParent = mParent; 12727 while (viewParent instanceof View) { 12728 final View view = (View) viewParent; 12729 12730 position[0] -= view.mScrollX; 12731 position[1] -= view.mScrollY; 12732 12733 if (!view.hasIdentityMatrix()) { 12734 view.getMatrix().mapPoints(position); 12735 } 12736 12737 position[0] += view.mLeft; 12738 position[1] += view.mTop; 12739 12740 viewParent = view.mParent; 12741 } 12742 12743 if (viewParent instanceof ViewRootImpl) { 12744 // *cough* 12745 final ViewRootImpl vr = (ViewRootImpl) viewParent; 12746 position[1] -= vr.mCurScrollY; 12747 } 12748 12749 location[0] = (int) (position[0] + 0.5f); 12750 location[1] = (int) (position[1] + 0.5f); 12751 } 12752 12753 /** 12754 * {@hide} 12755 * @param id the id of the view to be found 12756 * @return the view of the specified id, null if cannot be found 12757 */ 12758 protected View findViewTraversal(int id) { 12759 if (id == mID) { 12760 return this; 12761 } 12762 return null; 12763 } 12764 12765 /** 12766 * {@hide} 12767 * @param tag the tag of the view to be found 12768 * @return the view of specified tag, null if cannot be found 12769 */ 12770 protected View findViewWithTagTraversal(Object tag) { 12771 if (tag != null && tag.equals(mTag)) { 12772 return this; 12773 } 12774 return null; 12775 } 12776 12777 /** 12778 * {@hide} 12779 * @param predicate The predicate to evaluate. 12780 * @param childToSkip If not null, ignores this child during the recursive traversal. 12781 * @return The first view that matches the predicate or null. 12782 */ 12783 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 12784 if (predicate.apply(this)) { 12785 return this; 12786 } 12787 return null; 12788 } 12789 12790 /** 12791 * Look for a child view with the given id. If this view has the given 12792 * id, return this view. 12793 * 12794 * @param id The id to search for. 12795 * @return The view that has the given id in the hierarchy or null 12796 */ 12797 public final View findViewById(int id) { 12798 if (id < 0) { 12799 return null; 12800 } 12801 return findViewTraversal(id); 12802 } 12803 12804 /** 12805 * Finds a view by its unuque and stable accessibility id. 12806 * 12807 * @param accessibilityId The searched accessibility id. 12808 * @return The found view. 12809 */ 12810 final View findViewByAccessibilityId(int accessibilityId) { 12811 if (accessibilityId < 0) { 12812 return null; 12813 } 12814 return findViewByAccessibilityIdTraversal(accessibilityId); 12815 } 12816 12817 /** 12818 * Performs the traversal to find a view by its unuque and stable accessibility id. 12819 * 12820 * <strong>Note:</strong>This method does not stop at the root namespace 12821 * boundary since the user can touch the screen at an arbitrary location 12822 * potentially crossing the root namespace bounday which will send an 12823 * accessibility event to accessibility services and they should be able 12824 * to obtain the event source. Also accessibility ids are guaranteed to be 12825 * unique in the window. 12826 * 12827 * @param accessibilityId The accessibility id. 12828 * @return The found view. 12829 */ 12830 View findViewByAccessibilityIdTraversal(int accessibilityId) { 12831 if (getAccessibilityViewId() == accessibilityId) { 12832 return this; 12833 } 12834 return null; 12835 } 12836 12837 /** 12838 * Look for a child view with the given tag. If this view has the given 12839 * tag, return this view. 12840 * 12841 * @param tag The tag to search for, using "tag.equals(getTag())". 12842 * @return The View that has the given tag in the hierarchy or null 12843 */ 12844 public final View findViewWithTag(Object tag) { 12845 if (tag == null) { 12846 return null; 12847 } 12848 return findViewWithTagTraversal(tag); 12849 } 12850 12851 /** 12852 * {@hide} 12853 * Look for a child view that matches the specified predicate. 12854 * If this view matches the predicate, return this view. 12855 * 12856 * @param predicate The predicate to evaluate. 12857 * @return The first view that matches the predicate or null. 12858 */ 12859 public final View findViewByPredicate(Predicate<View> predicate) { 12860 return findViewByPredicateTraversal(predicate, null); 12861 } 12862 12863 /** 12864 * {@hide} 12865 * Look for a child view that matches the specified predicate, 12866 * starting with the specified view and its descendents and then 12867 * recusively searching the ancestors and siblings of that view 12868 * until this view is reached. 12869 * 12870 * This method is useful in cases where the predicate does not match 12871 * a single unique view (perhaps multiple views use the same id) 12872 * and we are trying to find the view that is "closest" in scope to the 12873 * starting view. 12874 * 12875 * @param start The view to start from. 12876 * @param predicate The predicate to evaluate. 12877 * @return The first view that matches the predicate or null. 12878 */ 12879 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 12880 View childToSkip = null; 12881 for (;;) { 12882 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 12883 if (view != null || start == this) { 12884 return view; 12885 } 12886 12887 ViewParent parent = start.getParent(); 12888 if (parent == null || !(parent instanceof View)) { 12889 return null; 12890 } 12891 12892 childToSkip = start; 12893 start = (View) parent; 12894 } 12895 } 12896 12897 /** 12898 * Sets the identifier for this view. The identifier does not have to be 12899 * unique in this view's hierarchy. The identifier should be a positive 12900 * number. 12901 * 12902 * @see #NO_ID 12903 * @see #getId() 12904 * @see #findViewById(int) 12905 * 12906 * @param id a number used to identify the view 12907 * 12908 * @attr ref android.R.styleable#View_id 12909 */ 12910 public void setId(int id) { 12911 mID = id; 12912 } 12913 12914 /** 12915 * {@hide} 12916 * 12917 * @param isRoot true if the view belongs to the root namespace, false 12918 * otherwise 12919 */ 12920 public void setIsRootNamespace(boolean isRoot) { 12921 if (isRoot) { 12922 mPrivateFlags |= IS_ROOT_NAMESPACE; 12923 } else { 12924 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 12925 } 12926 } 12927 12928 /** 12929 * {@hide} 12930 * 12931 * @return true if the view belongs to the root namespace, false otherwise 12932 */ 12933 public boolean isRootNamespace() { 12934 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 12935 } 12936 12937 /** 12938 * Returns this view's identifier. 12939 * 12940 * @return a positive integer used to identify the view or {@link #NO_ID} 12941 * if the view has no ID 12942 * 12943 * @see #setId(int) 12944 * @see #findViewById(int) 12945 * @attr ref android.R.styleable#View_id 12946 */ 12947 @ViewDebug.CapturedViewProperty 12948 public int getId() { 12949 return mID; 12950 } 12951 12952 /** 12953 * Returns this view's tag. 12954 * 12955 * @return the Object stored in this view as a tag 12956 * 12957 * @see #setTag(Object) 12958 * @see #getTag(int) 12959 */ 12960 @ViewDebug.ExportedProperty 12961 public Object getTag() { 12962 return mTag; 12963 } 12964 12965 /** 12966 * Sets the tag associated with this view. A tag can be used to mark 12967 * a view in its hierarchy and does not have to be unique within the 12968 * hierarchy. Tags can also be used to store data within a view without 12969 * resorting to another data structure. 12970 * 12971 * @param tag an Object to tag the view with 12972 * 12973 * @see #getTag() 12974 * @see #setTag(int, Object) 12975 */ 12976 public void setTag(final Object tag) { 12977 mTag = tag; 12978 } 12979 12980 /** 12981 * Returns the tag associated with this view and the specified key. 12982 * 12983 * @param key The key identifying the tag 12984 * 12985 * @return the Object stored in this view as a tag 12986 * 12987 * @see #setTag(int, Object) 12988 * @see #getTag() 12989 */ 12990 public Object getTag(int key) { 12991 if (mKeyedTags != null) return mKeyedTags.get(key); 12992 return null; 12993 } 12994 12995 /** 12996 * Sets a tag associated with this view and a key. A tag can be used 12997 * to mark a view in its hierarchy and does not have to be unique within 12998 * the hierarchy. Tags can also be used to store data within a view 12999 * without resorting to another data structure. 13000 * 13001 * The specified key should be an id declared in the resources of the 13002 * application to ensure it is unique (see the <a 13003 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 13004 * Keys identified as belonging to 13005 * the Android framework or not associated with any package will cause 13006 * an {@link IllegalArgumentException} to be thrown. 13007 * 13008 * @param key The key identifying the tag 13009 * @param tag An Object to tag the view with 13010 * 13011 * @throws IllegalArgumentException If they specified key is not valid 13012 * 13013 * @see #setTag(Object) 13014 * @see #getTag(int) 13015 */ 13016 public void setTag(int key, final Object tag) { 13017 // If the package id is 0x00 or 0x01, it's either an undefined package 13018 // or a framework id 13019 if ((key >>> 24) < 2) { 13020 throw new IllegalArgumentException("The key must be an application-specific " 13021 + "resource id."); 13022 } 13023 13024 setKeyedTag(key, tag); 13025 } 13026 13027 /** 13028 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 13029 * framework id. 13030 * 13031 * @hide 13032 */ 13033 public void setTagInternal(int key, Object tag) { 13034 if ((key >>> 24) != 0x1) { 13035 throw new IllegalArgumentException("The key must be a framework-specific " 13036 + "resource id."); 13037 } 13038 13039 setKeyedTag(key, tag); 13040 } 13041 13042 private void setKeyedTag(int key, Object tag) { 13043 if (mKeyedTags == null) { 13044 mKeyedTags = new SparseArray<Object>(); 13045 } 13046 13047 mKeyedTags.put(key, tag); 13048 } 13049 13050 /** 13051 * @param consistency The type of consistency. See ViewDebug for more information. 13052 * 13053 * @hide 13054 */ 13055 protected boolean dispatchConsistencyCheck(int consistency) { 13056 return onConsistencyCheck(consistency); 13057 } 13058 13059 /** 13060 * Method that subclasses should implement to check their consistency. The type of 13061 * consistency check is indicated by the bit field passed as a parameter. 13062 * 13063 * @param consistency The type of consistency. See ViewDebug for more information. 13064 * 13065 * @throws IllegalStateException if the view is in an inconsistent state. 13066 * 13067 * @hide 13068 */ 13069 protected boolean onConsistencyCheck(int consistency) { 13070 boolean result = true; 13071 13072 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 13073 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 13074 13075 if (checkLayout) { 13076 if (getParent() == null) { 13077 result = false; 13078 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 13079 "View " + this + " does not have a parent."); 13080 } 13081 13082 if (mAttachInfo == null) { 13083 result = false; 13084 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 13085 "View " + this + " is not attached to a window."); 13086 } 13087 } 13088 13089 if (checkDrawing) { 13090 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 13091 // from their draw() method 13092 13093 if ((mPrivateFlags & DRAWN) != DRAWN && 13094 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 13095 result = false; 13096 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 13097 "View " + this + " was invalidated but its drawing cache is valid."); 13098 } 13099 } 13100 13101 return result; 13102 } 13103 13104 /** 13105 * Prints information about this view in the log output, with the tag 13106 * {@link #VIEW_LOG_TAG}. 13107 * 13108 * @hide 13109 */ 13110 public void debug() { 13111 debug(0); 13112 } 13113 13114 /** 13115 * Prints information about this view in the log output, with the tag 13116 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 13117 * indentation defined by the <code>depth</code>. 13118 * 13119 * @param depth the indentation level 13120 * 13121 * @hide 13122 */ 13123 protected void debug(int depth) { 13124 String output = debugIndent(depth - 1); 13125 13126 output += "+ " + this; 13127 int id = getId(); 13128 if (id != -1) { 13129 output += " (id=" + id + ")"; 13130 } 13131 Object tag = getTag(); 13132 if (tag != null) { 13133 output += " (tag=" + tag + ")"; 13134 } 13135 Log.d(VIEW_LOG_TAG, output); 13136 13137 if ((mPrivateFlags & FOCUSED) != 0) { 13138 output = debugIndent(depth) + " FOCUSED"; 13139 Log.d(VIEW_LOG_TAG, output); 13140 } 13141 13142 output = debugIndent(depth); 13143 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 13144 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 13145 + "} "; 13146 Log.d(VIEW_LOG_TAG, output); 13147 13148 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 13149 || mPaddingBottom != 0) { 13150 output = debugIndent(depth); 13151 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 13152 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 13153 Log.d(VIEW_LOG_TAG, output); 13154 } 13155 13156 output = debugIndent(depth); 13157 output += "mMeasureWidth=" + mMeasuredWidth + 13158 " mMeasureHeight=" + mMeasuredHeight; 13159 Log.d(VIEW_LOG_TAG, output); 13160 13161 output = debugIndent(depth); 13162 if (mLayoutParams == null) { 13163 output += "BAD! no layout params"; 13164 } else { 13165 output = mLayoutParams.debug(output); 13166 } 13167 Log.d(VIEW_LOG_TAG, output); 13168 13169 output = debugIndent(depth); 13170 output += "flags={"; 13171 output += View.printFlags(mViewFlags); 13172 output += "}"; 13173 Log.d(VIEW_LOG_TAG, output); 13174 13175 output = debugIndent(depth); 13176 output += "privateFlags={"; 13177 output += View.printPrivateFlags(mPrivateFlags); 13178 output += "}"; 13179 Log.d(VIEW_LOG_TAG, output); 13180 } 13181 13182 /** 13183 * Creates a string of whitespaces used for indentation. 13184 * 13185 * @param depth the indentation level 13186 * @return a String containing (depth * 2 + 3) * 2 white spaces 13187 * 13188 * @hide 13189 */ 13190 protected static String debugIndent(int depth) { 13191 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 13192 for (int i = 0; i < (depth * 2) + 3; i++) { 13193 spaces.append(' ').append(' '); 13194 } 13195 return spaces.toString(); 13196 } 13197 13198 /** 13199 * <p>Return the offset of the widget's text baseline from the widget's top 13200 * boundary. If this widget does not support baseline alignment, this 13201 * method returns -1. </p> 13202 * 13203 * @return the offset of the baseline within the widget's bounds or -1 13204 * if baseline alignment is not supported 13205 */ 13206 @ViewDebug.ExportedProperty(category = "layout") 13207 public int getBaseline() { 13208 return -1; 13209 } 13210 13211 /** 13212 * Call this when something has changed which has invalidated the 13213 * layout of this view. This will schedule a layout pass of the view 13214 * tree. 13215 */ 13216 public void requestLayout() { 13217 if (ViewDebug.TRACE_HIERARCHY) { 13218 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 13219 } 13220 13221 mPrivateFlags |= FORCE_LAYOUT; 13222 mPrivateFlags |= INVALIDATED; 13223 13224 if (mParent != null) { 13225 if (mLayoutParams != null) { 13226 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 13227 } 13228 if (!mParent.isLayoutRequested()) { 13229 mParent.requestLayout(); 13230 } 13231 } 13232 } 13233 13234 /** 13235 * Forces this view to be laid out during the next layout pass. 13236 * This method does not call requestLayout() or forceLayout() 13237 * on the parent. 13238 */ 13239 public void forceLayout() { 13240 mPrivateFlags |= FORCE_LAYOUT; 13241 mPrivateFlags |= INVALIDATED; 13242 } 13243 13244 /** 13245 * <p> 13246 * This is called to find out how big a view should be. The parent 13247 * supplies constraint information in the width and height parameters. 13248 * </p> 13249 * 13250 * <p> 13251 * The actual measurement work of a view is performed in 13252 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 13253 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 13254 * </p> 13255 * 13256 * 13257 * @param widthMeasureSpec Horizontal space requirements as imposed by the 13258 * parent 13259 * @param heightMeasureSpec Vertical space requirements as imposed by the 13260 * parent 13261 * 13262 * @see #onMeasure(int, int) 13263 */ 13264 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 13265 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 13266 widthMeasureSpec != mOldWidthMeasureSpec || 13267 heightMeasureSpec != mOldHeightMeasureSpec) { 13268 13269 // first clears the measured dimension flag 13270 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 13271 13272 if (ViewDebug.TRACE_HIERARCHY) { 13273 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 13274 } 13275 13276 // measure ourselves, this should set the measured dimension flag back 13277 onMeasure(widthMeasureSpec, heightMeasureSpec); 13278 13279 // flag not set, setMeasuredDimension() was not invoked, we raise 13280 // an exception to warn the developer 13281 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 13282 throw new IllegalStateException("onMeasure() did not set the" 13283 + " measured dimension by calling" 13284 + " setMeasuredDimension()"); 13285 } 13286 13287 mPrivateFlags |= LAYOUT_REQUIRED; 13288 } 13289 13290 mOldWidthMeasureSpec = widthMeasureSpec; 13291 mOldHeightMeasureSpec = heightMeasureSpec; 13292 } 13293 13294 /** 13295 * <p> 13296 * Measure the view and its content to determine the measured width and the 13297 * measured height. This method is invoked by {@link #measure(int, int)} and 13298 * should be overriden by subclasses to provide accurate and efficient 13299 * measurement of their contents. 13300 * </p> 13301 * 13302 * <p> 13303 * <strong>CONTRACT:</strong> When overriding this method, you 13304 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 13305 * measured width and height of this view. Failure to do so will trigger an 13306 * <code>IllegalStateException</code>, thrown by 13307 * {@link #measure(int, int)}. Calling the superclass' 13308 * {@link #onMeasure(int, int)} is a valid use. 13309 * </p> 13310 * 13311 * <p> 13312 * The base class implementation of measure defaults to the background size, 13313 * unless a larger size is allowed by the MeasureSpec. Subclasses should 13314 * override {@link #onMeasure(int, int)} to provide better measurements of 13315 * their content. 13316 * </p> 13317 * 13318 * <p> 13319 * If this method is overridden, it is the subclass's responsibility to make 13320 * sure the measured height and width are at least the view's minimum height 13321 * and width ({@link #getSuggestedMinimumHeight()} and 13322 * {@link #getSuggestedMinimumWidth()}). 13323 * </p> 13324 * 13325 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 13326 * The requirements are encoded with 13327 * {@link android.view.View.MeasureSpec}. 13328 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 13329 * The requirements are encoded with 13330 * {@link android.view.View.MeasureSpec}. 13331 * 13332 * @see #getMeasuredWidth() 13333 * @see #getMeasuredHeight() 13334 * @see #setMeasuredDimension(int, int) 13335 * @see #getSuggestedMinimumHeight() 13336 * @see #getSuggestedMinimumWidth() 13337 * @see android.view.View.MeasureSpec#getMode(int) 13338 * @see android.view.View.MeasureSpec#getSize(int) 13339 */ 13340 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 13341 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 13342 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 13343 } 13344 13345 /** 13346 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 13347 * measured width and measured height. Failing to do so will trigger an 13348 * exception at measurement time.</p> 13349 * 13350 * @param measuredWidth The measured width of this view. May be a complex 13351 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 13352 * {@link #MEASURED_STATE_TOO_SMALL}. 13353 * @param measuredHeight The measured height of this view. May be a complex 13354 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 13355 * {@link #MEASURED_STATE_TOO_SMALL}. 13356 */ 13357 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 13358 mMeasuredWidth = measuredWidth; 13359 mMeasuredHeight = measuredHeight; 13360 13361 mPrivateFlags |= MEASURED_DIMENSION_SET; 13362 } 13363 13364 /** 13365 * Merge two states as returned by {@link #getMeasuredState()}. 13366 * @param curState The current state as returned from a view or the result 13367 * of combining multiple views. 13368 * @param newState The new view state to combine. 13369 * @return Returns a new integer reflecting the combination of the two 13370 * states. 13371 */ 13372 public static int combineMeasuredStates(int curState, int newState) { 13373 return curState | newState; 13374 } 13375 13376 /** 13377 * Version of {@link #resolveSizeAndState(int, int, int)} 13378 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 13379 */ 13380 public static int resolveSize(int size, int measureSpec) { 13381 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 13382 } 13383 13384 /** 13385 * Utility to reconcile a desired size and state, with constraints imposed 13386 * by a MeasureSpec. Will take the desired size, unless a different size 13387 * is imposed by the constraints. The returned value is a compound integer, 13388 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 13389 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 13390 * size is smaller than the size the view wants to be. 13391 * 13392 * @param size How big the view wants to be 13393 * @param measureSpec Constraints imposed by the parent 13394 * @return Size information bit mask as defined by 13395 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 13396 */ 13397 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 13398 int result = size; 13399 int specMode = MeasureSpec.getMode(measureSpec); 13400 int specSize = MeasureSpec.getSize(measureSpec); 13401 switch (specMode) { 13402 case MeasureSpec.UNSPECIFIED: 13403 result = size; 13404 break; 13405 case MeasureSpec.AT_MOST: 13406 if (specSize < size) { 13407 result = specSize | MEASURED_STATE_TOO_SMALL; 13408 } else { 13409 result = size; 13410 } 13411 break; 13412 case MeasureSpec.EXACTLY: 13413 result = specSize; 13414 break; 13415 } 13416 return result | (childMeasuredState&MEASURED_STATE_MASK); 13417 } 13418 13419 /** 13420 * Utility to return a default size. Uses the supplied size if the 13421 * MeasureSpec imposed no constraints. Will get larger if allowed 13422 * by the MeasureSpec. 13423 * 13424 * @param size Default size for this view 13425 * @param measureSpec Constraints imposed by the parent 13426 * @return The size this view should be. 13427 */ 13428 public static int getDefaultSize(int size, int measureSpec) { 13429 int result = size; 13430 int specMode = MeasureSpec.getMode(measureSpec); 13431 int specSize = MeasureSpec.getSize(measureSpec); 13432 13433 switch (specMode) { 13434 case MeasureSpec.UNSPECIFIED: 13435 result = size; 13436 break; 13437 case MeasureSpec.AT_MOST: 13438 case MeasureSpec.EXACTLY: 13439 result = specSize; 13440 break; 13441 } 13442 return result; 13443 } 13444 13445 /** 13446 * Returns the suggested minimum height that the view should use. This 13447 * returns the maximum of the view's minimum height 13448 * and the background's minimum height 13449 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 13450 * <p> 13451 * When being used in {@link #onMeasure(int, int)}, the caller should still 13452 * ensure the returned height is within the requirements of the parent. 13453 * 13454 * @return The suggested minimum height of the view. 13455 */ 13456 protected int getSuggestedMinimumHeight() { 13457 int suggestedMinHeight = mMinHeight; 13458 13459 if (mBGDrawable != null) { 13460 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 13461 if (suggestedMinHeight < bgMinHeight) { 13462 suggestedMinHeight = bgMinHeight; 13463 } 13464 } 13465 13466 return suggestedMinHeight; 13467 } 13468 13469 /** 13470 * Returns the suggested minimum width that the view should use. This 13471 * returns the maximum of the view's minimum width) 13472 * and the background's minimum width 13473 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 13474 * <p> 13475 * When being used in {@link #onMeasure(int, int)}, the caller should still 13476 * ensure the returned width is within the requirements of the parent. 13477 * 13478 * @return The suggested minimum width of the view. 13479 */ 13480 protected int getSuggestedMinimumWidth() { 13481 int suggestedMinWidth = mMinWidth; 13482 13483 if (mBGDrawable != null) { 13484 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 13485 if (suggestedMinWidth < bgMinWidth) { 13486 suggestedMinWidth = bgMinWidth; 13487 } 13488 } 13489 13490 return suggestedMinWidth; 13491 } 13492 13493 /** 13494 * Sets the minimum height of the view. It is not guaranteed the view will 13495 * be able to achieve this minimum height (for example, if its parent layout 13496 * constrains it with less available height). 13497 * 13498 * @param minHeight The minimum height the view will try to be. 13499 */ 13500 public void setMinimumHeight(int minHeight) { 13501 mMinHeight = minHeight; 13502 } 13503 13504 /** 13505 * Sets the minimum width of the view. It is not guaranteed the view will 13506 * be able to achieve this minimum width (for example, if its parent layout 13507 * constrains it with less available width). 13508 * 13509 * @param minWidth The minimum width the view will try to be. 13510 */ 13511 public void setMinimumWidth(int minWidth) { 13512 mMinWidth = minWidth; 13513 } 13514 13515 /** 13516 * Get the animation currently associated with this view. 13517 * 13518 * @return The animation that is currently playing or 13519 * scheduled to play for this view. 13520 */ 13521 public Animation getAnimation() { 13522 return mCurrentAnimation; 13523 } 13524 13525 /** 13526 * Start the specified animation now. 13527 * 13528 * @param animation the animation to start now 13529 */ 13530 public void startAnimation(Animation animation) { 13531 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 13532 setAnimation(animation); 13533 invalidateParentCaches(); 13534 invalidate(true); 13535 } 13536 13537 /** 13538 * Cancels any animations for this view. 13539 */ 13540 public void clearAnimation() { 13541 if (mCurrentAnimation != null) { 13542 mCurrentAnimation.detach(); 13543 } 13544 mCurrentAnimation = null; 13545 invalidateParentIfNeeded(); 13546 } 13547 13548 /** 13549 * Sets the next animation to play for this view. 13550 * If you want the animation to play immediately, use 13551 * startAnimation. This method provides allows fine-grained 13552 * control over the start time and invalidation, but you 13553 * must make sure that 1) the animation has a start time set, and 13554 * 2) the view will be invalidated when the animation is supposed to 13555 * start. 13556 * 13557 * @param animation The next animation, or null. 13558 */ 13559 public void setAnimation(Animation animation) { 13560 mCurrentAnimation = animation; 13561 if (animation != null) { 13562 animation.reset(); 13563 } 13564 } 13565 13566 /** 13567 * Invoked by a parent ViewGroup to notify the start of the animation 13568 * currently associated with this view. If you override this method, 13569 * always call super.onAnimationStart(); 13570 * 13571 * @see #setAnimation(android.view.animation.Animation) 13572 * @see #getAnimation() 13573 */ 13574 protected void onAnimationStart() { 13575 mPrivateFlags |= ANIMATION_STARTED; 13576 } 13577 13578 /** 13579 * Invoked by a parent ViewGroup to notify the end of the animation 13580 * currently associated with this view. If you override this method, 13581 * always call super.onAnimationEnd(); 13582 * 13583 * @see #setAnimation(android.view.animation.Animation) 13584 * @see #getAnimation() 13585 */ 13586 protected void onAnimationEnd() { 13587 mPrivateFlags &= ~ANIMATION_STARTED; 13588 } 13589 13590 /** 13591 * Invoked if there is a Transform that involves alpha. Subclass that can 13592 * draw themselves with the specified alpha should return true, and then 13593 * respect that alpha when their onDraw() is called. If this returns false 13594 * then the view may be redirected to draw into an offscreen buffer to 13595 * fulfill the request, which will look fine, but may be slower than if the 13596 * subclass handles it internally. The default implementation returns false. 13597 * 13598 * @param alpha The alpha (0..255) to apply to the view's drawing 13599 * @return true if the view can draw with the specified alpha. 13600 */ 13601 protected boolean onSetAlpha(int alpha) { 13602 return false; 13603 } 13604 13605 /** 13606 * This is used by the RootView to perform an optimization when 13607 * the view hierarchy contains one or several SurfaceView. 13608 * SurfaceView is always considered transparent, but its children are not, 13609 * therefore all View objects remove themselves from the global transparent 13610 * region (passed as a parameter to this function). 13611 * 13612 * @param region The transparent region for this ViewAncestor (window). 13613 * 13614 * @return Returns true if the effective visibility of the view at this 13615 * point is opaque, regardless of the transparent region; returns false 13616 * if it is possible for underlying windows to be seen behind the view. 13617 * 13618 * {@hide} 13619 */ 13620 public boolean gatherTransparentRegion(Region region) { 13621 final AttachInfo attachInfo = mAttachInfo; 13622 if (region != null && attachInfo != null) { 13623 final int pflags = mPrivateFlags; 13624 if ((pflags & SKIP_DRAW) == 0) { 13625 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 13626 // remove it from the transparent region. 13627 final int[] location = attachInfo.mTransparentLocation; 13628 getLocationInWindow(location); 13629 region.op(location[0], location[1], location[0] + mRight - mLeft, 13630 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 13631 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 13632 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 13633 // exists, so we remove the background drawable's non-transparent 13634 // parts from this transparent region. 13635 applyDrawableToTransparentRegion(mBGDrawable, region); 13636 } 13637 } 13638 return true; 13639 } 13640 13641 /** 13642 * Play a sound effect for this view. 13643 * 13644 * <p>The framework will play sound effects for some built in actions, such as 13645 * clicking, but you may wish to play these effects in your widget, 13646 * for instance, for internal navigation. 13647 * 13648 * <p>The sound effect will only be played if sound effects are enabled by the user, and 13649 * {@link #isSoundEffectsEnabled()} is true. 13650 * 13651 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 13652 */ 13653 public void playSoundEffect(int soundConstant) { 13654 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 13655 return; 13656 } 13657 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 13658 } 13659 13660 /** 13661 * BZZZTT!!1! 13662 * 13663 * <p>Provide haptic feedback to the user for this view. 13664 * 13665 * <p>The framework will provide haptic feedback for some built in actions, 13666 * such as long presses, but you may wish to provide feedback for your 13667 * own widget. 13668 * 13669 * <p>The feedback will only be performed if 13670 * {@link #isHapticFeedbackEnabled()} is true. 13671 * 13672 * @param feedbackConstant One of the constants defined in 13673 * {@link HapticFeedbackConstants} 13674 */ 13675 public boolean performHapticFeedback(int feedbackConstant) { 13676 return performHapticFeedback(feedbackConstant, 0); 13677 } 13678 13679 /** 13680 * BZZZTT!!1! 13681 * 13682 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 13683 * 13684 * @param feedbackConstant One of the constants defined in 13685 * {@link HapticFeedbackConstants} 13686 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 13687 */ 13688 public boolean performHapticFeedback(int feedbackConstant, int flags) { 13689 if (mAttachInfo == null) { 13690 return false; 13691 } 13692 //noinspection SimplifiableIfStatement 13693 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 13694 && !isHapticFeedbackEnabled()) { 13695 return false; 13696 } 13697 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 13698 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 13699 } 13700 13701 /** 13702 * Request that the visibility of the status bar be changed. 13703 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13704 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13705 */ 13706 public void setSystemUiVisibility(int visibility) { 13707 if (visibility != mSystemUiVisibility) { 13708 mSystemUiVisibility = visibility; 13709 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 13710 mParent.recomputeViewAttributes(this); 13711 } 13712 } 13713 } 13714 13715 /** 13716 * Returns the status bar visibility that this view has requested. 13717 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13718 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13719 */ 13720 public int getSystemUiVisibility() { 13721 return mSystemUiVisibility; 13722 } 13723 13724 /** 13725 * Set a listener to receive callbacks when the visibility of the system bar changes. 13726 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 13727 */ 13728 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 13729 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 13730 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 13731 mParent.recomputeViewAttributes(this); 13732 } 13733 } 13734 13735 /** 13736 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 13737 * the view hierarchy. 13738 */ 13739 public void dispatchSystemUiVisibilityChanged(int visibility) { 13740 ListenerInfo li = mListenerInfo; 13741 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 13742 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 13743 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 13744 } 13745 } 13746 13747 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 13748 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 13749 if (val != mSystemUiVisibility) { 13750 setSystemUiVisibility(val); 13751 } 13752 } 13753 13754 /** 13755 * Creates an image that the system displays during the drag and drop 13756 * operation. This is called a "drag shadow". The default implementation 13757 * for a DragShadowBuilder based on a View returns an image that has exactly the same 13758 * appearance as the given View. The default also positions the center of the drag shadow 13759 * directly under the touch point. If no View is provided (the constructor with no parameters 13760 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 13761 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 13762 * default is an invisible drag shadow. 13763 * <p> 13764 * You are not required to use the View you provide to the constructor as the basis of the 13765 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 13766 * anything you want as the drag shadow. 13767 * </p> 13768 * <p> 13769 * You pass a DragShadowBuilder object to the system when you start the drag. The system 13770 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 13771 * size and position of the drag shadow. It uses this data to construct a 13772 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 13773 * so that your application can draw the shadow image in the Canvas. 13774 * </p> 13775 * 13776 * <div class="special reference"> 13777 * <h3>Developer Guides</h3> 13778 * <p>For a guide to implementing drag and drop features, read the 13779 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 13780 * </div> 13781 */ 13782 public static class DragShadowBuilder { 13783 private final WeakReference<View> mView; 13784 13785 /** 13786 * Constructs a shadow image builder based on a View. By default, the resulting drag 13787 * shadow will have the same appearance and dimensions as the View, with the touch point 13788 * over the center of the View. 13789 * @param view A View. Any View in scope can be used. 13790 */ 13791 public DragShadowBuilder(View view) { 13792 mView = new WeakReference<View>(view); 13793 } 13794 13795 /** 13796 * Construct a shadow builder object with no associated View. This 13797 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 13798 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 13799 * to supply the drag shadow's dimensions and appearance without 13800 * reference to any View object. If they are not overridden, then the result is an 13801 * invisible drag shadow. 13802 */ 13803 public DragShadowBuilder() { 13804 mView = new WeakReference<View>(null); 13805 } 13806 13807 /** 13808 * Returns the View object that had been passed to the 13809 * {@link #View.DragShadowBuilder(View)} 13810 * constructor. If that View parameter was {@code null} or if the 13811 * {@link #View.DragShadowBuilder()} 13812 * constructor was used to instantiate the builder object, this method will return 13813 * null. 13814 * 13815 * @return The View object associate with this builder object. 13816 */ 13817 @SuppressWarnings({"JavadocReference"}) 13818 final public View getView() { 13819 return mView.get(); 13820 } 13821 13822 /** 13823 * Provides the metrics for the shadow image. These include the dimensions of 13824 * the shadow image, and the point within that shadow that should 13825 * be centered under the touch location while dragging. 13826 * <p> 13827 * The default implementation sets the dimensions of the shadow to be the 13828 * same as the dimensions of the View itself and centers the shadow under 13829 * the touch point. 13830 * </p> 13831 * 13832 * @param shadowSize A {@link android.graphics.Point} containing the width and height 13833 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 13834 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 13835 * image. 13836 * 13837 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 13838 * shadow image that should be underneath the touch point during the drag and drop 13839 * operation. Your application must set {@link android.graphics.Point#x} to the 13840 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 13841 */ 13842 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 13843 final View view = mView.get(); 13844 if (view != null) { 13845 shadowSize.set(view.getWidth(), view.getHeight()); 13846 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 13847 } else { 13848 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 13849 } 13850 } 13851 13852 /** 13853 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 13854 * based on the dimensions it received from the 13855 * {@link #onProvideShadowMetrics(Point, Point)} callback. 13856 * 13857 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 13858 */ 13859 public void onDrawShadow(Canvas canvas) { 13860 final View view = mView.get(); 13861 if (view != null) { 13862 view.draw(canvas); 13863 } else { 13864 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 13865 } 13866 } 13867 } 13868 13869 /** 13870 * Starts a drag and drop operation. When your application calls this method, it passes a 13871 * {@link android.view.View.DragShadowBuilder} object to the system. The 13872 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 13873 * to get metrics for the drag shadow, and then calls the object's 13874 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 13875 * <p> 13876 * Once the system has the drag shadow, it begins the drag and drop operation by sending 13877 * drag events to all the View objects in your application that are currently visible. It does 13878 * this either by calling the View object's drag listener (an implementation of 13879 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 13880 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 13881 * Both are passed a {@link android.view.DragEvent} object that has a 13882 * {@link android.view.DragEvent#getAction()} value of 13883 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 13884 * </p> 13885 * <p> 13886 * Your application can invoke startDrag() on any attached View object. The View object does not 13887 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 13888 * be related to the View the user selected for dragging. 13889 * </p> 13890 * @param data A {@link android.content.ClipData} object pointing to the data to be 13891 * transferred by the drag and drop operation. 13892 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 13893 * drag shadow. 13894 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 13895 * drop operation. This Object is put into every DragEvent object sent by the system during the 13896 * current drag. 13897 * <p> 13898 * myLocalState is a lightweight mechanism for the sending information from the dragged View 13899 * to the target Views. For example, it can contain flags that differentiate between a 13900 * a copy operation and a move operation. 13901 * </p> 13902 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 13903 * so the parameter should be set to 0. 13904 * @return {@code true} if the method completes successfully, or 13905 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 13906 * do a drag, and so no drag operation is in progress. 13907 */ 13908 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 13909 Object myLocalState, int flags) { 13910 if (ViewDebug.DEBUG_DRAG) { 13911 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 13912 } 13913 boolean okay = false; 13914 13915 Point shadowSize = new Point(); 13916 Point shadowTouchPoint = new Point(); 13917 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 13918 13919 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 13920 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 13921 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 13922 } 13923 13924 if (ViewDebug.DEBUG_DRAG) { 13925 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 13926 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 13927 } 13928 Surface surface = new Surface(); 13929 try { 13930 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 13931 flags, shadowSize.x, shadowSize.y, surface); 13932 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 13933 + " surface=" + surface); 13934 if (token != null) { 13935 Canvas canvas = surface.lockCanvas(null); 13936 try { 13937 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 13938 shadowBuilder.onDrawShadow(canvas); 13939 } finally { 13940 surface.unlockCanvasAndPost(canvas); 13941 } 13942 13943 final ViewRootImpl root = getViewRootImpl(); 13944 13945 // Cache the local state object for delivery with DragEvents 13946 root.setLocalDragState(myLocalState); 13947 13948 // repurpose 'shadowSize' for the last touch point 13949 root.getLastTouchPoint(shadowSize); 13950 13951 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 13952 shadowSize.x, shadowSize.y, 13953 shadowTouchPoint.x, shadowTouchPoint.y, data); 13954 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 13955 13956 // Off and running! Release our local surface instance; the drag 13957 // shadow surface is now managed by the system process. 13958 surface.release(); 13959 } 13960 } catch (Exception e) { 13961 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 13962 surface.destroy(); 13963 } 13964 13965 return okay; 13966 } 13967 13968 /** 13969 * Handles drag events sent by the system following a call to 13970 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 13971 *<p> 13972 * When the system calls this method, it passes a 13973 * {@link android.view.DragEvent} object. A call to 13974 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 13975 * in DragEvent. The method uses these to determine what is happening in the drag and drop 13976 * operation. 13977 * @param event The {@link android.view.DragEvent} sent by the system. 13978 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 13979 * in DragEvent, indicating the type of drag event represented by this object. 13980 * @return {@code true} if the method was successful, otherwise {@code false}. 13981 * <p> 13982 * The method should return {@code true} in response to an action type of 13983 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 13984 * operation. 13985 * </p> 13986 * <p> 13987 * The method should also return {@code true} in response to an action type of 13988 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 13989 * {@code false} if it didn't. 13990 * </p> 13991 */ 13992 public boolean onDragEvent(DragEvent event) { 13993 return false; 13994 } 13995 13996 /** 13997 * Detects if this View is enabled and has a drag event listener. 13998 * If both are true, then it calls the drag event listener with the 13999 * {@link android.view.DragEvent} it received. If the drag event listener returns 14000 * {@code true}, then dispatchDragEvent() returns {@code true}. 14001 * <p> 14002 * For all other cases, the method calls the 14003 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 14004 * method and returns its result. 14005 * </p> 14006 * <p> 14007 * This ensures that a drag event is always consumed, even if the View does not have a drag 14008 * event listener. However, if the View has a listener and the listener returns true, then 14009 * onDragEvent() is not called. 14010 * </p> 14011 */ 14012 public boolean dispatchDragEvent(DragEvent event) { 14013 //noinspection SimplifiableIfStatement 14014 ListenerInfo li = mListenerInfo; 14015 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 14016 && li.mOnDragListener.onDrag(this, event)) { 14017 return true; 14018 } 14019 return onDragEvent(event); 14020 } 14021 14022 boolean canAcceptDrag() { 14023 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 14024 } 14025 14026 /** 14027 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 14028 * it is ever exposed at all. 14029 * @hide 14030 */ 14031 public void onCloseSystemDialogs(String reason) { 14032 } 14033 14034 /** 14035 * Given a Drawable whose bounds have been set to draw into this view, 14036 * update a Region being computed for 14037 * {@link #gatherTransparentRegion(android.graphics.Region)} so 14038 * that any non-transparent parts of the Drawable are removed from the 14039 * given transparent region. 14040 * 14041 * @param dr The Drawable whose transparency is to be applied to the region. 14042 * @param region A Region holding the current transparency information, 14043 * where any parts of the region that are set are considered to be 14044 * transparent. On return, this region will be modified to have the 14045 * transparency information reduced by the corresponding parts of the 14046 * Drawable that are not transparent. 14047 * {@hide} 14048 */ 14049 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 14050 if (DBG) { 14051 Log.i("View", "Getting transparent region for: " + this); 14052 } 14053 final Region r = dr.getTransparentRegion(); 14054 final Rect db = dr.getBounds(); 14055 final AttachInfo attachInfo = mAttachInfo; 14056 if (r != null && attachInfo != null) { 14057 final int w = getRight()-getLeft(); 14058 final int h = getBottom()-getTop(); 14059 if (db.left > 0) { 14060 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 14061 r.op(0, 0, db.left, h, Region.Op.UNION); 14062 } 14063 if (db.right < w) { 14064 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 14065 r.op(db.right, 0, w, h, Region.Op.UNION); 14066 } 14067 if (db.top > 0) { 14068 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 14069 r.op(0, 0, w, db.top, Region.Op.UNION); 14070 } 14071 if (db.bottom < h) { 14072 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 14073 r.op(0, db.bottom, w, h, Region.Op.UNION); 14074 } 14075 final int[] location = attachInfo.mTransparentLocation; 14076 getLocationInWindow(location); 14077 r.translate(location[0], location[1]); 14078 region.op(r, Region.Op.INTERSECT); 14079 } else { 14080 region.op(db, Region.Op.DIFFERENCE); 14081 } 14082 } 14083 14084 private void checkForLongClick(int delayOffset) { 14085 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 14086 mHasPerformedLongPress = false; 14087 14088 if (mPendingCheckForLongPress == null) { 14089 mPendingCheckForLongPress = new CheckForLongPress(); 14090 } 14091 mPendingCheckForLongPress.rememberWindowAttachCount(); 14092 postDelayed(mPendingCheckForLongPress, 14093 ViewConfiguration.getLongPressTimeout() - delayOffset); 14094 } 14095 } 14096 14097 /** 14098 * Inflate a view from an XML resource. This convenience method wraps the {@link 14099 * LayoutInflater} class, which provides a full range of options for view inflation. 14100 * 14101 * @param context The Context object for your activity or application. 14102 * @param resource The resource ID to inflate 14103 * @param root A view group that will be the parent. Used to properly inflate the 14104 * layout_* parameters. 14105 * @see LayoutInflater 14106 */ 14107 public static View inflate(Context context, int resource, ViewGroup root) { 14108 LayoutInflater factory = LayoutInflater.from(context); 14109 return factory.inflate(resource, root); 14110 } 14111 14112 /** 14113 * Scroll the view with standard behavior for scrolling beyond the normal 14114 * content boundaries. Views that call this method should override 14115 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 14116 * results of an over-scroll operation. 14117 * 14118 * Views can use this method to handle any touch or fling-based scrolling. 14119 * 14120 * @param deltaX Change in X in pixels 14121 * @param deltaY Change in Y in pixels 14122 * @param scrollX Current X scroll value in pixels before applying deltaX 14123 * @param scrollY Current Y scroll value in pixels before applying deltaY 14124 * @param scrollRangeX Maximum content scroll range along the X axis 14125 * @param scrollRangeY Maximum content scroll range along the Y axis 14126 * @param maxOverScrollX Number of pixels to overscroll by in either direction 14127 * along the X axis. 14128 * @param maxOverScrollY Number of pixels to overscroll by in either direction 14129 * along the Y axis. 14130 * @param isTouchEvent true if this scroll operation is the result of a touch event. 14131 * @return true if scrolling was clamped to an over-scroll boundary along either 14132 * axis, false otherwise. 14133 */ 14134 @SuppressWarnings({"UnusedParameters"}) 14135 protected boolean overScrollBy(int deltaX, int deltaY, 14136 int scrollX, int scrollY, 14137 int scrollRangeX, int scrollRangeY, 14138 int maxOverScrollX, int maxOverScrollY, 14139 boolean isTouchEvent) { 14140 final int overScrollMode = mOverScrollMode; 14141 final boolean canScrollHorizontal = 14142 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 14143 final boolean canScrollVertical = 14144 computeVerticalScrollRange() > computeVerticalScrollExtent(); 14145 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 14146 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 14147 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 14148 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 14149 14150 int newScrollX = scrollX + deltaX; 14151 if (!overScrollHorizontal) { 14152 maxOverScrollX = 0; 14153 } 14154 14155 int newScrollY = scrollY + deltaY; 14156 if (!overScrollVertical) { 14157 maxOverScrollY = 0; 14158 } 14159 14160 // Clamp values if at the limits and record 14161 final int left = -maxOverScrollX; 14162 final int right = maxOverScrollX + scrollRangeX; 14163 final int top = -maxOverScrollY; 14164 final int bottom = maxOverScrollY + scrollRangeY; 14165 14166 boolean clampedX = false; 14167 if (newScrollX > right) { 14168 newScrollX = right; 14169 clampedX = true; 14170 } else if (newScrollX < left) { 14171 newScrollX = left; 14172 clampedX = true; 14173 } 14174 14175 boolean clampedY = false; 14176 if (newScrollY > bottom) { 14177 newScrollY = bottom; 14178 clampedY = true; 14179 } else if (newScrollY < top) { 14180 newScrollY = top; 14181 clampedY = true; 14182 } 14183 14184 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 14185 14186 return clampedX || clampedY; 14187 } 14188 14189 /** 14190 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 14191 * respond to the results of an over-scroll operation. 14192 * 14193 * @param scrollX New X scroll value in pixels 14194 * @param scrollY New Y scroll value in pixels 14195 * @param clampedX True if scrollX was clamped to an over-scroll boundary 14196 * @param clampedY True if scrollY was clamped to an over-scroll boundary 14197 */ 14198 protected void onOverScrolled(int scrollX, int scrollY, 14199 boolean clampedX, boolean clampedY) { 14200 // Intentionally empty. 14201 } 14202 14203 /** 14204 * Returns the over-scroll mode for this view. The result will be 14205 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 14206 * (allow over-scrolling only if the view content is larger than the container), 14207 * or {@link #OVER_SCROLL_NEVER}. 14208 * 14209 * @return This view's over-scroll mode. 14210 */ 14211 public int getOverScrollMode() { 14212 return mOverScrollMode; 14213 } 14214 14215 /** 14216 * Set the over-scroll mode for this view. Valid over-scroll modes are 14217 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 14218 * (allow over-scrolling only if the view content is larger than the container), 14219 * or {@link #OVER_SCROLL_NEVER}. 14220 * 14221 * Setting the over-scroll mode of a view will have an effect only if the 14222 * view is capable of scrolling. 14223 * 14224 * @param overScrollMode The new over-scroll mode for this view. 14225 */ 14226 public void setOverScrollMode(int overScrollMode) { 14227 if (overScrollMode != OVER_SCROLL_ALWAYS && 14228 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 14229 overScrollMode != OVER_SCROLL_NEVER) { 14230 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 14231 } 14232 mOverScrollMode = overScrollMode; 14233 } 14234 14235 /** 14236 * Gets a scale factor that determines the distance the view should scroll 14237 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 14238 * @return The vertical scroll scale factor. 14239 * @hide 14240 */ 14241 protected float getVerticalScrollFactor() { 14242 if (mVerticalScrollFactor == 0) { 14243 TypedValue outValue = new TypedValue(); 14244 if (!mContext.getTheme().resolveAttribute( 14245 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 14246 throw new IllegalStateException( 14247 "Expected theme to define listPreferredItemHeight."); 14248 } 14249 mVerticalScrollFactor = outValue.getDimension( 14250 mContext.getResources().getDisplayMetrics()); 14251 } 14252 return mVerticalScrollFactor; 14253 } 14254 14255 /** 14256 * Gets a scale factor that determines the distance the view should scroll 14257 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 14258 * @return The horizontal scroll scale factor. 14259 * @hide 14260 */ 14261 protected float getHorizontalScrollFactor() { 14262 // TODO: Should use something else. 14263 return getVerticalScrollFactor(); 14264 } 14265 14266 /** 14267 * Return the value specifying the text direction or policy that was set with 14268 * {@link #setTextDirection(int)}. 14269 * 14270 * @return the defined text direction. It can be one of: 14271 * 14272 * {@link #TEXT_DIRECTION_INHERIT}, 14273 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14274 * {@link #TEXT_DIRECTION_ANY_RTL}, 14275 * {@link #TEXT_DIRECTION_LTR}, 14276 * {@link #TEXT_DIRECTION_RTL}, 14277 * {@link #TEXT_DIRECTION_LOCALE}, 14278 */ 14279 @ViewDebug.ExportedProperty(category = "text", mapping = { 14280 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 14281 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 14282 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 14283 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 14284 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 14285 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 14286 }) 14287 public int getTextDirection() { 14288 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 14289 } 14290 14291 /** 14292 * Set the text direction. 14293 * 14294 * @param textDirection the direction to set. Should be one of: 14295 * 14296 * {@link #TEXT_DIRECTION_INHERIT}, 14297 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14298 * {@link #TEXT_DIRECTION_ANY_RTL}, 14299 * {@link #TEXT_DIRECTION_LTR}, 14300 * {@link #TEXT_DIRECTION_RTL}, 14301 * {@link #TEXT_DIRECTION_LOCALE}, 14302 */ 14303 public void setTextDirection(int textDirection) { 14304 if (getTextDirection() != textDirection) { 14305 // Reset the current text direction 14306 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 14307 // Set the new text direction 14308 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 14309 // Reset the current resolved text direction 14310 resetResolvedTextDirection(); 14311 // Ask for a layout pass 14312 requestLayout(); 14313 } 14314 } 14315 14316 /** 14317 * Return the resolved text direction. 14318 * 14319 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 14320 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 14321 * up the parent chain of the view. if there is no parent, then it will return the default 14322 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 14323 * 14324 * @return the resolved text direction. Returns one of: 14325 * 14326 * {@link #TEXT_DIRECTION_FIRST_STRONG} 14327 * {@link #TEXT_DIRECTION_ANY_RTL}, 14328 * {@link #TEXT_DIRECTION_LTR}, 14329 * {@link #TEXT_DIRECTION_RTL}, 14330 * {@link #TEXT_DIRECTION_LOCALE}, 14331 */ 14332 public int getResolvedTextDirection() { 14333 // The text direction is not inherited so return it back 14334 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 14335 resolveTextDirection(); 14336 } 14337 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 14338 } 14339 14340 /** 14341 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 14342 * resolution is done. 14343 */ 14344 public void resolveTextDirection() { 14345 // Reset any previous text direction resolution 14346 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 14347 14348 // Set resolved text direction flag depending on text direction flag 14349 final int textDirection = getTextDirection(); 14350 switch(textDirection) { 14351 case TEXT_DIRECTION_INHERIT: 14352 if (canResolveTextDirection()) { 14353 ViewGroup viewGroup = ((ViewGroup) mParent); 14354 14355 // Set current resolved direction to the same value as the parent's one 14356 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 14357 switch (parentResolvedDirection) { 14358 case TEXT_DIRECTION_FIRST_STRONG: 14359 case TEXT_DIRECTION_ANY_RTL: 14360 case TEXT_DIRECTION_LTR: 14361 case TEXT_DIRECTION_RTL: 14362 case TEXT_DIRECTION_LOCALE: 14363 mPrivateFlags2 |= 14364 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 14365 break; 14366 default: 14367 // Default resolved direction is "first strong" heuristic 14368 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 14369 } 14370 } else { 14371 // We cannot do the resolution if there is no parent, so use the default one 14372 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 14373 } 14374 break; 14375 case TEXT_DIRECTION_FIRST_STRONG: 14376 case TEXT_DIRECTION_ANY_RTL: 14377 case TEXT_DIRECTION_LTR: 14378 case TEXT_DIRECTION_RTL: 14379 case TEXT_DIRECTION_LOCALE: 14380 // Resolved direction is the same as text direction 14381 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 14382 break; 14383 default: 14384 // Default resolved direction is "first strong" heuristic 14385 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 14386 } 14387 14388 // Set to resolved 14389 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 14390 onResolvedTextDirectionChanged(); 14391 } 14392 14393 /** 14394 * Called when text direction has been resolved. Subclasses that care about text direction 14395 * resolution should override this method. 14396 * 14397 * The default implementation does nothing. 14398 */ 14399 public void onResolvedTextDirectionChanged() { 14400 } 14401 14402 /** 14403 * Check if text direction resolution can be done. 14404 * 14405 * @return true if text direction resolution can be done otherwise return false. 14406 */ 14407 public boolean canResolveTextDirection() { 14408 switch (getTextDirection()) { 14409 case TEXT_DIRECTION_INHERIT: 14410 return (mParent != null) && (mParent instanceof ViewGroup); 14411 default: 14412 return true; 14413 } 14414 } 14415 14416 /** 14417 * Reset resolved text direction. Text direction can be resolved with a call to 14418 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 14419 * reset is done. 14420 */ 14421 public void resetResolvedTextDirection() { 14422 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 14423 onResolvedTextDirectionReset(); 14424 } 14425 14426 /** 14427 * Called when text direction is reset. Subclasses that care about text direction reset should 14428 * override this method and do a reset of the text direction of their children. The default 14429 * implementation does nothing. 14430 */ 14431 public void onResolvedTextDirectionReset() { 14432 } 14433 14434 // 14435 // Properties 14436 // 14437 /** 14438 * A Property wrapper around the <code>alpha</code> functionality handled by the 14439 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 14440 */ 14441 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 14442 @Override 14443 public void setValue(View object, float value) { 14444 object.setAlpha(value); 14445 } 14446 14447 @Override 14448 public Float get(View object) { 14449 return object.getAlpha(); 14450 } 14451 }; 14452 14453 /** 14454 * A Property wrapper around the <code>translationX</code> functionality handled by the 14455 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 14456 */ 14457 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 14458 @Override 14459 public void setValue(View object, float value) { 14460 object.setTranslationX(value); 14461 } 14462 14463 @Override 14464 public Float get(View object) { 14465 return object.getTranslationX(); 14466 } 14467 }; 14468 14469 /** 14470 * A Property wrapper around the <code>translationY</code> functionality handled by the 14471 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 14472 */ 14473 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 14474 @Override 14475 public void setValue(View object, float value) { 14476 object.setTranslationY(value); 14477 } 14478 14479 @Override 14480 public Float get(View object) { 14481 return object.getTranslationY(); 14482 } 14483 }; 14484 14485 /** 14486 * A Property wrapper around the <code>x</code> functionality handled by the 14487 * {@link View#setX(float)} and {@link View#getX()} methods. 14488 */ 14489 public static final Property<View, Float> X = new FloatProperty<View>("x") { 14490 @Override 14491 public void setValue(View object, float value) { 14492 object.setX(value); 14493 } 14494 14495 @Override 14496 public Float get(View object) { 14497 return object.getX(); 14498 } 14499 }; 14500 14501 /** 14502 * A Property wrapper around the <code>y</code> functionality handled by the 14503 * {@link View#setY(float)} and {@link View#getY()} methods. 14504 */ 14505 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 14506 @Override 14507 public void setValue(View object, float value) { 14508 object.setY(value); 14509 } 14510 14511 @Override 14512 public Float get(View object) { 14513 return object.getY(); 14514 } 14515 }; 14516 14517 /** 14518 * A Property wrapper around the <code>rotation</code> functionality handled by the 14519 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 14520 */ 14521 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 14522 @Override 14523 public void setValue(View object, float value) { 14524 object.setRotation(value); 14525 } 14526 14527 @Override 14528 public Float get(View object) { 14529 return object.getRotation(); 14530 } 14531 }; 14532 14533 /** 14534 * A Property wrapper around the <code>rotationX</code> functionality handled by the 14535 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 14536 */ 14537 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 14538 @Override 14539 public void setValue(View object, float value) { 14540 object.setRotationX(value); 14541 } 14542 14543 @Override 14544 public Float get(View object) { 14545 return object.getRotationX(); 14546 } 14547 }; 14548 14549 /** 14550 * A Property wrapper around the <code>rotationY</code> functionality handled by the 14551 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 14552 */ 14553 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 14554 @Override 14555 public void setValue(View object, float value) { 14556 object.setRotationY(value); 14557 } 14558 14559 @Override 14560 public Float get(View object) { 14561 return object.getRotationY(); 14562 } 14563 }; 14564 14565 /** 14566 * A Property wrapper around the <code>scaleX</code> functionality handled by the 14567 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 14568 */ 14569 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 14570 @Override 14571 public void setValue(View object, float value) { 14572 object.setScaleX(value); 14573 } 14574 14575 @Override 14576 public Float get(View object) { 14577 return object.getScaleX(); 14578 } 14579 }; 14580 14581 /** 14582 * A Property wrapper around the <code>scaleY</code> functionality handled by the 14583 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 14584 */ 14585 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 14586 @Override 14587 public void setValue(View object, float value) { 14588 object.setScaleY(value); 14589 } 14590 14591 @Override 14592 public Float get(View object) { 14593 return object.getScaleY(); 14594 } 14595 }; 14596 14597 /** 14598 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 14599 * Each MeasureSpec represents a requirement for either the width or the height. 14600 * A MeasureSpec is comprised of a size and a mode. There are three possible 14601 * modes: 14602 * <dl> 14603 * <dt>UNSPECIFIED</dt> 14604 * <dd> 14605 * The parent has not imposed any constraint on the child. It can be whatever size 14606 * it wants. 14607 * </dd> 14608 * 14609 * <dt>EXACTLY</dt> 14610 * <dd> 14611 * The parent has determined an exact size for the child. The child is going to be 14612 * given those bounds regardless of how big it wants to be. 14613 * </dd> 14614 * 14615 * <dt>AT_MOST</dt> 14616 * <dd> 14617 * The child can be as large as it wants up to the specified size. 14618 * </dd> 14619 * </dl> 14620 * 14621 * MeasureSpecs are implemented as ints to reduce object allocation. This class 14622 * is provided to pack and unpack the <size, mode> tuple into the int. 14623 */ 14624 public static class MeasureSpec { 14625 private static final int MODE_SHIFT = 30; 14626 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 14627 14628 /** 14629 * Measure specification mode: The parent has not imposed any constraint 14630 * on the child. It can be whatever size it wants. 14631 */ 14632 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 14633 14634 /** 14635 * Measure specification mode: The parent has determined an exact size 14636 * for the child. The child is going to be given those bounds regardless 14637 * of how big it wants to be. 14638 */ 14639 public static final int EXACTLY = 1 << MODE_SHIFT; 14640 14641 /** 14642 * Measure specification mode: The child can be as large as it wants up 14643 * to the specified size. 14644 */ 14645 public static final int AT_MOST = 2 << MODE_SHIFT; 14646 14647 /** 14648 * Creates a measure specification based on the supplied size and mode. 14649 * 14650 * The mode must always be one of the following: 14651 * <ul> 14652 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 14653 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 14654 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 14655 * </ul> 14656 * 14657 * @param size the size of the measure specification 14658 * @param mode the mode of the measure specification 14659 * @return the measure specification based on size and mode 14660 */ 14661 public static int makeMeasureSpec(int size, int mode) { 14662 return size + mode; 14663 } 14664 14665 /** 14666 * Extracts the mode from the supplied measure specification. 14667 * 14668 * @param measureSpec the measure specification to extract the mode from 14669 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 14670 * {@link android.view.View.MeasureSpec#AT_MOST} or 14671 * {@link android.view.View.MeasureSpec#EXACTLY} 14672 */ 14673 public static int getMode(int measureSpec) { 14674 return (measureSpec & MODE_MASK); 14675 } 14676 14677 /** 14678 * Extracts the size from the supplied measure specification. 14679 * 14680 * @param measureSpec the measure specification to extract the size from 14681 * @return the size in pixels defined in the supplied measure specification 14682 */ 14683 public static int getSize(int measureSpec) { 14684 return (measureSpec & ~MODE_MASK); 14685 } 14686 14687 /** 14688 * Returns a String representation of the specified measure 14689 * specification. 14690 * 14691 * @param measureSpec the measure specification to convert to a String 14692 * @return a String with the following format: "MeasureSpec: MODE SIZE" 14693 */ 14694 public static String toString(int measureSpec) { 14695 int mode = getMode(measureSpec); 14696 int size = getSize(measureSpec); 14697 14698 StringBuilder sb = new StringBuilder("MeasureSpec: "); 14699 14700 if (mode == UNSPECIFIED) 14701 sb.append("UNSPECIFIED "); 14702 else if (mode == EXACTLY) 14703 sb.append("EXACTLY "); 14704 else if (mode == AT_MOST) 14705 sb.append("AT_MOST "); 14706 else 14707 sb.append(mode).append(" "); 14708 14709 sb.append(size); 14710 return sb.toString(); 14711 } 14712 } 14713 14714 class CheckForLongPress implements Runnable { 14715 14716 private int mOriginalWindowAttachCount; 14717 14718 public void run() { 14719 if (isPressed() && (mParent != null) 14720 && mOriginalWindowAttachCount == mWindowAttachCount) { 14721 if (performLongClick()) { 14722 mHasPerformedLongPress = true; 14723 } 14724 } 14725 } 14726 14727 public void rememberWindowAttachCount() { 14728 mOriginalWindowAttachCount = mWindowAttachCount; 14729 } 14730 } 14731 14732 private final class CheckForTap implements Runnable { 14733 public void run() { 14734 mPrivateFlags &= ~PREPRESSED; 14735 setPressed(true); 14736 checkForLongClick(ViewConfiguration.getTapTimeout()); 14737 } 14738 } 14739 14740 private final class PerformClick implements Runnable { 14741 public void run() { 14742 performClick(); 14743 } 14744 } 14745 14746 /** @hide */ 14747 public void hackTurnOffWindowResizeAnim(boolean off) { 14748 mAttachInfo.mTurnOffWindowResizeAnim = off; 14749 } 14750 14751 /** 14752 * This method returns a ViewPropertyAnimator object, which can be used to animate 14753 * specific properties on this View. 14754 * 14755 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 14756 */ 14757 public ViewPropertyAnimator animate() { 14758 if (mAnimator == null) { 14759 mAnimator = new ViewPropertyAnimator(this); 14760 } 14761 return mAnimator; 14762 } 14763 14764 /** 14765 * Interface definition for a callback to be invoked when a key event is 14766 * dispatched to this view. The callback will be invoked before the key 14767 * event is given to the view. 14768 */ 14769 public interface OnKeyListener { 14770 /** 14771 * Called when a key is dispatched to a view. This allows listeners to 14772 * get a chance to respond before the target view. 14773 * 14774 * @param v The view the key has been dispatched to. 14775 * @param keyCode The code for the physical key that was pressed 14776 * @param event The KeyEvent object containing full information about 14777 * the event. 14778 * @return True if the listener has consumed the event, false otherwise. 14779 */ 14780 boolean onKey(View v, int keyCode, KeyEvent event); 14781 } 14782 14783 /** 14784 * Interface definition for a callback to be invoked when a touch event is 14785 * dispatched to this view. The callback will be invoked before the touch 14786 * event is given to the view. 14787 */ 14788 public interface OnTouchListener { 14789 /** 14790 * Called when a touch event is dispatched to a view. This allows listeners to 14791 * get a chance to respond before the target view. 14792 * 14793 * @param v The view the touch event has been dispatched to. 14794 * @param event The MotionEvent object containing full information about 14795 * the event. 14796 * @return True if the listener has consumed the event, false otherwise. 14797 */ 14798 boolean onTouch(View v, MotionEvent event); 14799 } 14800 14801 /** 14802 * Interface definition for a callback to be invoked when a hover event is 14803 * dispatched to this view. The callback will be invoked before the hover 14804 * event is given to the view. 14805 */ 14806 public interface OnHoverListener { 14807 /** 14808 * Called when a hover event is dispatched to a view. This allows listeners to 14809 * get a chance to respond before the target view. 14810 * 14811 * @param v The view the hover event has been dispatched to. 14812 * @param event The MotionEvent object containing full information about 14813 * the event. 14814 * @return True if the listener has consumed the event, false otherwise. 14815 */ 14816 boolean onHover(View v, MotionEvent event); 14817 } 14818 14819 /** 14820 * Interface definition for a callback to be invoked when a generic motion event is 14821 * dispatched to this view. The callback will be invoked before the generic motion 14822 * event is given to the view. 14823 */ 14824 public interface OnGenericMotionListener { 14825 /** 14826 * Called when a generic motion event is dispatched to a view. This allows listeners to 14827 * get a chance to respond before the target view. 14828 * 14829 * @param v The view the generic motion event has been dispatched to. 14830 * @param event The MotionEvent object containing full information about 14831 * the event. 14832 * @return True if the listener has consumed the event, false otherwise. 14833 */ 14834 boolean onGenericMotion(View v, MotionEvent event); 14835 } 14836 14837 /** 14838 * Interface definition for a callback to be invoked when a view has been clicked and held. 14839 */ 14840 public interface OnLongClickListener { 14841 /** 14842 * Called when a view has been clicked and held. 14843 * 14844 * @param v The view that was clicked and held. 14845 * 14846 * @return true if the callback consumed the long click, false otherwise. 14847 */ 14848 boolean onLongClick(View v); 14849 } 14850 14851 /** 14852 * Interface definition for a callback to be invoked when a drag is being dispatched 14853 * to this view. The callback will be invoked before the hosting view's own 14854 * onDrag(event) method. If the listener wants to fall back to the hosting view's 14855 * onDrag(event) behavior, it should return 'false' from this callback. 14856 * 14857 * <div class="special reference"> 14858 * <h3>Developer Guides</h3> 14859 * <p>For a guide to implementing drag and drop features, read the 14860 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 14861 * </div> 14862 */ 14863 public interface OnDragListener { 14864 /** 14865 * Called when a drag event is dispatched to a view. This allows listeners 14866 * to get a chance to override base View behavior. 14867 * 14868 * @param v The View that received the drag event. 14869 * @param event The {@link android.view.DragEvent} object for the drag event. 14870 * @return {@code true} if the drag event was handled successfully, or {@code false} 14871 * if the drag event was not handled. Note that {@code false} will trigger the View 14872 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 14873 */ 14874 boolean onDrag(View v, DragEvent event); 14875 } 14876 14877 /** 14878 * Interface definition for a callback to be invoked when the focus state of 14879 * a view changed. 14880 */ 14881 public interface OnFocusChangeListener { 14882 /** 14883 * Called when the focus state of a view has changed. 14884 * 14885 * @param v The view whose state has changed. 14886 * @param hasFocus The new focus state of v. 14887 */ 14888 void onFocusChange(View v, boolean hasFocus); 14889 } 14890 14891 /** 14892 * Interface definition for a callback to be invoked when a view is clicked. 14893 */ 14894 public interface OnClickListener { 14895 /** 14896 * Called when a view has been clicked. 14897 * 14898 * @param v The view that was clicked. 14899 */ 14900 void onClick(View v); 14901 } 14902 14903 /** 14904 * Interface definition for a callback to be invoked when the context menu 14905 * for this view is being built. 14906 */ 14907 public interface OnCreateContextMenuListener { 14908 /** 14909 * Called when the context menu for this view is being built. It is not 14910 * safe to hold onto the menu after this method returns. 14911 * 14912 * @param menu The context menu that is being built 14913 * @param v The view for which the context menu is being built 14914 * @param menuInfo Extra information about the item for which the 14915 * context menu should be shown. This information will vary 14916 * depending on the class of v. 14917 */ 14918 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 14919 } 14920 14921 /** 14922 * Interface definition for a callback to be invoked when the status bar changes 14923 * visibility. This reports <strong>global</strong> changes to the system UI 14924 * state, not just what the application is requesting. 14925 * 14926 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 14927 */ 14928 public interface OnSystemUiVisibilityChangeListener { 14929 /** 14930 * Called when the status bar changes visibility because of a call to 14931 * {@link View#setSystemUiVisibility(int)}. 14932 * 14933 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 14934 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. This tells you the 14935 * <strong>global</strong> state of the UI visibility flags, not what your 14936 * app is currently applying. 14937 */ 14938 public void onSystemUiVisibilityChange(int visibility); 14939 } 14940 14941 /** 14942 * Interface definition for a callback to be invoked when this view is attached 14943 * or detached from its window. 14944 */ 14945 public interface OnAttachStateChangeListener { 14946 /** 14947 * Called when the view is attached to a window. 14948 * @param v The view that was attached 14949 */ 14950 public void onViewAttachedToWindow(View v); 14951 /** 14952 * Called when the view is detached from a window. 14953 * @param v The view that was detached 14954 */ 14955 public void onViewDetachedFromWindow(View v); 14956 } 14957 14958 private final class UnsetPressedState implements Runnable { 14959 public void run() { 14960 setPressed(false); 14961 } 14962 } 14963 14964 /** 14965 * Base class for derived classes that want to save and restore their own 14966 * state in {@link android.view.View#onSaveInstanceState()}. 14967 */ 14968 public static class BaseSavedState extends AbsSavedState { 14969 /** 14970 * Constructor used when reading from a parcel. Reads the state of the superclass. 14971 * 14972 * @param source 14973 */ 14974 public BaseSavedState(Parcel source) { 14975 super(source); 14976 } 14977 14978 /** 14979 * Constructor called by derived classes when creating their SavedState objects 14980 * 14981 * @param superState The state of the superclass of this view 14982 */ 14983 public BaseSavedState(Parcelable superState) { 14984 super(superState); 14985 } 14986 14987 public static final Parcelable.Creator<BaseSavedState> CREATOR = 14988 new Parcelable.Creator<BaseSavedState>() { 14989 public BaseSavedState createFromParcel(Parcel in) { 14990 return new BaseSavedState(in); 14991 } 14992 14993 public BaseSavedState[] newArray(int size) { 14994 return new BaseSavedState[size]; 14995 } 14996 }; 14997 } 14998 14999 /** 15000 * A set of information given to a view when it is attached to its parent 15001 * window. 15002 */ 15003 static class AttachInfo { 15004 interface Callbacks { 15005 void playSoundEffect(int effectId); 15006 boolean performHapticFeedback(int effectId, boolean always); 15007 } 15008 15009 /** 15010 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 15011 * to a Handler. This class contains the target (View) to invalidate and 15012 * the coordinates of the dirty rectangle. 15013 * 15014 * For performance purposes, this class also implements a pool of up to 15015 * POOL_LIMIT objects that get reused. This reduces memory allocations 15016 * whenever possible. 15017 */ 15018 static class InvalidateInfo implements Poolable<InvalidateInfo> { 15019 private static final int POOL_LIMIT = 10; 15020 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 15021 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 15022 public InvalidateInfo newInstance() { 15023 return new InvalidateInfo(); 15024 } 15025 15026 public void onAcquired(InvalidateInfo element) { 15027 } 15028 15029 public void onReleased(InvalidateInfo element) { 15030 element.target = null; 15031 } 15032 }, POOL_LIMIT) 15033 ); 15034 15035 private InvalidateInfo mNext; 15036 private boolean mIsPooled; 15037 15038 View target; 15039 15040 int left; 15041 int top; 15042 int right; 15043 int bottom; 15044 15045 public void setNextPoolable(InvalidateInfo element) { 15046 mNext = element; 15047 } 15048 15049 public InvalidateInfo getNextPoolable() { 15050 return mNext; 15051 } 15052 15053 static InvalidateInfo acquire() { 15054 return sPool.acquire(); 15055 } 15056 15057 void release() { 15058 sPool.release(this); 15059 } 15060 15061 public boolean isPooled() { 15062 return mIsPooled; 15063 } 15064 15065 public void setPooled(boolean isPooled) { 15066 mIsPooled = isPooled; 15067 } 15068 } 15069 15070 final IWindowSession mSession; 15071 15072 final IWindow mWindow; 15073 15074 final IBinder mWindowToken; 15075 15076 final Callbacks mRootCallbacks; 15077 15078 HardwareCanvas mHardwareCanvas; 15079 15080 /** 15081 * The top view of the hierarchy. 15082 */ 15083 View mRootView; 15084 15085 IBinder mPanelParentWindowToken; 15086 Surface mSurface; 15087 15088 boolean mHardwareAccelerated; 15089 boolean mHardwareAccelerationRequested; 15090 HardwareRenderer mHardwareRenderer; 15091 15092 boolean mScreenOn; 15093 15094 /** 15095 * Scale factor used by the compatibility mode 15096 */ 15097 float mApplicationScale; 15098 15099 /** 15100 * Indicates whether the application is in compatibility mode 15101 */ 15102 boolean mScalingRequired; 15103 15104 /** 15105 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 15106 */ 15107 boolean mTurnOffWindowResizeAnim; 15108 15109 /** 15110 * Left position of this view's window 15111 */ 15112 int mWindowLeft; 15113 15114 /** 15115 * Top position of this view's window 15116 */ 15117 int mWindowTop; 15118 15119 /** 15120 * Indicates whether views need to use 32-bit drawing caches 15121 */ 15122 boolean mUse32BitDrawingCache; 15123 15124 /** 15125 * For windows that are full-screen but using insets to layout inside 15126 * of the screen decorations, these are the current insets for the 15127 * content of the window. 15128 */ 15129 final Rect mContentInsets = new Rect(); 15130 15131 /** 15132 * For windows that are full-screen but using insets to layout inside 15133 * of the screen decorations, these are the current insets for the 15134 * actual visible parts of the window. 15135 */ 15136 final Rect mVisibleInsets = new Rect(); 15137 15138 /** 15139 * The internal insets given by this window. This value is 15140 * supplied by the client (through 15141 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 15142 * be given to the window manager when changed to be used in laying 15143 * out windows behind it. 15144 */ 15145 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 15146 = new ViewTreeObserver.InternalInsetsInfo(); 15147 15148 /** 15149 * All views in the window's hierarchy that serve as scroll containers, 15150 * used to determine if the window can be resized or must be panned 15151 * to adjust for a soft input area. 15152 */ 15153 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 15154 15155 final KeyEvent.DispatcherState mKeyDispatchState 15156 = new KeyEvent.DispatcherState(); 15157 15158 /** 15159 * Indicates whether the view's window currently has the focus. 15160 */ 15161 boolean mHasWindowFocus; 15162 15163 /** 15164 * The current visibility of the window. 15165 */ 15166 int mWindowVisibility; 15167 15168 /** 15169 * Indicates the time at which drawing started to occur. 15170 */ 15171 long mDrawingTime; 15172 15173 /** 15174 * Indicates whether or not ignoring the DIRTY_MASK flags. 15175 */ 15176 boolean mIgnoreDirtyState; 15177 15178 /** 15179 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 15180 * to avoid clearing that flag prematurely. 15181 */ 15182 boolean mSetIgnoreDirtyState = false; 15183 15184 /** 15185 * Indicates whether the view's window is currently in touch mode. 15186 */ 15187 boolean mInTouchMode; 15188 15189 /** 15190 * Indicates that ViewAncestor should trigger a global layout change 15191 * the next time it performs a traversal 15192 */ 15193 boolean mRecomputeGlobalAttributes; 15194 15195 /** 15196 * Always report new attributes at next traversal. 15197 */ 15198 boolean mForceReportNewAttributes; 15199 15200 /** 15201 * Set during a traveral if any views want to keep the screen on. 15202 */ 15203 boolean mKeepScreenOn; 15204 15205 /** 15206 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 15207 */ 15208 int mSystemUiVisibility; 15209 15210 /** 15211 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 15212 * attached. 15213 */ 15214 boolean mHasSystemUiListeners; 15215 15216 /** 15217 * Set if the visibility of any views has changed. 15218 */ 15219 boolean mViewVisibilityChanged; 15220 15221 /** 15222 * Set to true if a view has been scrolled. 15223 */ 15224 boolean mViewScrollChanged; 15225 15226 /** 15227 * Global to the view hierarchy used as a temporary for dealing with 15228 * x/y points in the transparent region computations. 15229 */ 15230 final int[] mTransparentLocation = new int[2]; 15231 15232 /** 15233 * Global to the view hierarchy used as a temporary for dealing with 15234 * x/y points in the ViewGroup.invalidateChild implementation. 15235 */ 15236 final int[] mInvalidateChildLocation = new int[2]; 15237 15238 15239 /** 15240 * Global to the view hierarchy used as a temporary for dealing with 15241 * x/y location when view is transformed. 15242 */ 15243 final float[] mTmpTransformLocation = new float[2]; 15244 15245 /** 15246 * The view tree observer used to dispatch global events like 15247 * layout, pre-draw, touch mode change, etc. 15248 */ 15249 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 15250 15251 /** 15252 * A Canvas used by the view hierarchy to perform bitmap caching. 15253 */ 15254 Canvas mCanvas; 15255 15256 /** 15257 * The view root impl. 15258 */ 15259 final ViewRootImpl mViewRootImpl; 15260 15261 /** 15262 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 15263 * handler can be used to pump events in the UI events queue. 15264 */ 15265 final Handler mHandler; 15266 15267 /** 15268 * Temporary for use in computing invalidate rectangles while 15269 * calling up the hierarchy. 15270 */ 15271 final Rect mTmpInvalRect = new Rect(); 15272 15273 /** 15274 * Temporary for use in computing hit areas with transformed views 15275 */ 15276 final RectF mTmpTransformRect = new RectF(); 15277 15278 /** 15279 * Temporary list for use in collecting focusable descendents of a view. 15280 */ 15281 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 15282 15283 /** 15284 * The id of the window for accessibility purposes. 15285 */ 15286 int mAccessibilityWindowId = View.NO_ID; 15287 15288 /** 15289 * Creates a new set of attachment information with the specified 15290 * events handler and thread. 15291 * 15292 * @param handler the events handler the view must use 15293 */ 15294 AttachInfo(IWindowSession session, IWindow window, 15295 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 15296 mSession = session; 15297 mWindow = window; 15298 mWindowToken = window.asBinder(); 15299 mViewRootImpl = viewRootImpl; 15300 mHandler = handler; 15301 mRootCallbacks = effectPlayer; 15302 } 15303 } 15304 15305 /** 15306 * <p>ScrollabilityCache holds various fields used by a View when scrolling 15307 * is supported. This avoids keeping too many unused fields in most 15308 * instances of View.</p> 15309 */ 15310 private static class ScrollabilityCache implements Runnable { 15311 15312 /** 15313 * Scrollbars are not visible 15314 */ 15315 public static final int OFF = 0; 15316 15317 /** 15318 * Scrollbars are visible 15319 */ 15320 public static final int ON = 1; 15321 15322 /** 15323 * Scrollbars are fading away 15324 */ 15325 public static final int FADING = 2; 15326 15327 public boolean fadeScrollBars; 15328 15329 public int fadingEdgeLength; 15330 public int scrollBarDefaultDelayBeforeFade; 15331 public int scrollBarFadeDuration; 15332 15333 public int scrollBarSize; 15334 public ScrollBarDrawable scrollBar; 15335 public float[] interpolatorValues; 15336 public View host; 15337 15338 public final Paint paint; 15339 public final Matrix matrix; 15340 public Shader shader; 15341 15342 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 15343 15344 private static final float[] OPAQUE = { 255 }; 15345 private static final float[] TRANSPARENT = { 0.0f }; 15346 15347 /** 15348 * When fading should start. This time moves into the future every time 15349 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 15350 */ 15351 public long fadeStartTime; 15352 15353 15354 /** 15355 * The current state of the scrollbars: ON, OFF, or FADING 15356 */ 15357 public int state = OFF; 15358 15359 private int mLastColor; 15360 15361 public ScrollabilityCache(ViewConfiguration configuration, View host) { 15362 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 15363 scrollBarSize = configuration.getScaledScrollBarSize(); 15364 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 15365 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 15366 15367 paint = new Paint(); 15368 matrix = new Matrix(); 15369 // use use a height of 1, and then wack the matrix each time we 15370 // actually use it. 15371 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 15372 15373 paint.setShader(shader); 15374 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 15375 this.host = host; 15376 } 15377 15378 public void setFadeColor(int color) { 15379 if (color != 0 && color != mLastColor) { 15380 mLastColor = color; 15381 color |= 0xFF000000; 15382 15383 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 15384 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 15385 15386 paint.setShader(shader); 15387 // Restore the default transfer mode (src_over) 15388 paint.setXfermode(null); 15389 } 15390 } 15391 15392 public void run() { 15393 long now = AnimationUtils.currentAnimationTimeMillis(); 15394 if (now >= fadeStartTime) { 15395 15396 // the animation fades the scrollbars out by changing 15397 // the opacity (alpha) from fully opaque to fully 15398 // transparent 15399 int nextFrame = (int) now; 15400 int framesCount = 0; 15401 15402 Interpolator interpolator = scrollBarInterpolator; 15403 15404 // Start opaque 15405 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 15406 15407 // End transparent 15408 nextFrame += scrollBarFadeDuration; 15409 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 15410 15411 state = FADING; 15412 15413 // Kick off the fade animation 15414 host.invalidate(true); 15415 } 15416 } 15417 } 15418 15419 /** 15420 * Resuable callback for sending 15421 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 15422 */ 15423 private class SendViewScrolledAccessibilityEvent implements Runnable { 15424 public volatile boolean mIsPending; 15425 15426 public void run() { 15427 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 15428 mIsPending = false; 15429 } 15430 } 15431 15432 /** 15433 * <p> 15434 * This class represents a delegate that can be registered in a {@link View} 15435 * to enhance accessibility support via composition rather via inheritance. 15436 * It is specifically targeted to widget developers that extend basic View 15437 * classes i.e. classes in package android.view, that would like their 15438 * applications to be backwards compatible. 15439 * </p> 15440 * <p> 15441 * A scenario in which a developer would like to use an accessibility delegate 15442 * is overriding a method introduced in a later API version then the minimal API 15443 * version supported by the application. For example, the method 15444 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 15445 * in API version 4 when the accessibility APIs were first introduced. If a 15446 * developer would like his application to run on API version 4 devices (assuming 15447 * all other APIs used by the application are version 4 or lower) and take advantage 15448 * of this method, instead of overriding the method which would break the application's 15449 * backwards compatibility, he can override the corresponding method in this 15450 * delegate and register the delegate in the target View if the API version of 15451 * the system is high enough i.e. the API version is same or higher to the API 15452 * version that introduced 15453 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 15454 * </p> 15455 * <p> 15456 * Here is an example implementation: 15457 * </p> 15458 * <code><pre><p> 15459 * if (Build.VERSION.SDK_INT >= 14) { 15460 * // If the API version is equal of higher than the version in 15461 * // which onInitializeAccessibilityNodeInfo was introduced we 15462 * // register a delegate with a customized implementation. 15463 * View view = findViewById(R.id.view_id); 15464 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 15465 * public void onInitializeAccessibilityNodeInfo(View host, 15466 * AccessibilityNodeInfo info) { 15467 * // Let the default implementation populate the info. 15468 * super.onInitializeAccessibilityNodeInfo(host, info); 15469 * // Set some other information. 15470 * info.setEnabled(host.isEnabled()); 15471 * } 15472 * }); 15473 * } 15474 * </code></pre></p> 15475 * <p> 15476 * This delegate contains methods that correspond to the accessibility methods 15477 * in View. If a delegate has been specified the implementation in View hands 15478 * off handling to the corresponding method in this delegate. The default 15479 * implementation the delegate methods behaves exactly as the corresponding 15480 * method in View for the case of no accessibility delegate been set. Hence, 15481 * to customize the behavior of a View method, clients can override only the 15482 * corresponding delegate method without altering the behavior of the rest 15483 * accessibility related methods of the host view. 15484 * </p> 15485 */ 15486 public static class AccessibilityDelegate { 15487 15488 /** 15489 * Sends an accessibility event of the given type. If accessibility is not 15490 * enabled this method has no effect. 15491 * <p> 15492 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 15493 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 15494 * been set. 15495 * </p> 15496 * 15497 * @param host The View hosting the delegate. 15498 * @param eventType The type of the event to send. 15499 * 15500 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 15501 */ 15502 public void sendAccessibilityEvent(View host, int eventType) { 15503 host.sendAccessibilityEventInternal(eventType); 15504 } 15505 15506 /** 15507 * Sends an accessibility event. This method behaves exactly as 15508 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 15509 * empty {@link AccessibilityEvent} and does not perform a check whether 15510 * accessibility is enabled. 15511 * <p> 15512 * The default implementation behaves as 15513 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15514 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 15515 * the case of no accessibility delegate been set. 15516 * </p> 15517 * 15518 * @param host The View hosting the delegate. 15519 * @param event The event to send. 15520 * 15521 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15522 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 15523 */ 15524 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 15525 host.sendAccessibilityEventUncheckedInternal(event); 15526 } 15527 15528 /** 15529 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 15530 * to its children for adding their text content to the event. 15531 * <p> 15532 * The default implementation behaves as 15533 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15534 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 15535 * the case of no accessibility delegate been set. 15536 * </p> 15537 * 15538 * @param host The View hosting the delegate. 15539 * @param event The event. 15540 * @return True if the event population was completed. 15541 * 15542 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15543 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 15544 */ 15545 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 15546 return host.dispatchPopulateAccessibilityEventInternal(event); 15547 } 15548 15549 /** 15550 * Gives a chance to the host View to populate the accessibility event with its 15551 * text content. 15552 * <p> 15553 * The default implementation behaves as 15554 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 15555 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 15556 * the case of no accessibility delegate been set. 15557 * </p> 15558 * 15559 * @param host The View hosting the delegate. 15560 * @param event The accessibility event which to populate. 15561 * 15562 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 15563 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 15564 */ 15565 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 15566 host.onPopulateAccessibilityEventInternal(event); 15567 } 15568 15569 /** 15570 * Initializes an {@link AccessibilityEvent} with information about the 15571 * the host View which is the event source. 15572 * <p> 15573 * The default implementation behaves as 15574 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 15575 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 15576 * the case of no accessibility delegate been set. 15577 * </p> 15578 * 15579 * @param host The View hosting the delegate. 15580 * @param event The event to initialize. 15581 * 15582 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 15583 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 15584 */ 15585 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 15586 host.onInitializeAccessibilityEventInternal(event); 15587 } 15588 15589 /** 15590 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 15591 * <p> 15592 * The default implementation behaves as 15593 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15594 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 15595 * the case of no accessibility delegate been set. 15596 * </p> 15597 * 15598 * @param host The View hosting the delegate. 15599 * @param info The instance to initialize. 15600 * 15601 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15602 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 15603 */ 15604 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 15605 host.onInitializeAccessibilityNodeInfoInternal(info); 15606 } 15607 15608 /** 15609 * Called when a child of the host View has requested sending an 15610 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 15611 * to augment the event. 15612 * <p> 15613 * The default implementation behaves as 15614 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15615 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 15616 * the case of no accessibility delegate been set. 15617 * </p> 15618 * 15619 * @param host The View hosting the delegate. 15620 * @param child The child which requests sending the event. 15621 * @param event The event to be sent. 15622 * @return True if the event should be sent 15623 * 15624 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15625 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 15626 */ 15627 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 15628 AccessibilityEvent event) { 15629 return host.onRequestSendAccessibilityEventInternal(child, event); 15630 } 15631 15632 /** 15633 * Gets the provider for managing a virtual view hierarchy rooted at this View 15634 * and reported to {@link android.accessibilityservice.AccessibilityService}s 15635 * that explore the window content. 15636 * <p> 15637 * The default implementation behaves as 15638 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 15639 * the case of no accessibility delegate been set. 15640 * </p> 15641 * 15642 * @return The provider. 15643 * 15644 * @see AccessibilityNodeProvider 15645 */ 15646 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 15647 return null; 15648 } 15649 } 15650} 15651