View.java revision 2a9fa89643ce796ee6dc7edae2742b291b6c5f40
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Interpolator; 28import android.graphics.LinearGradient; 29import android.graphics.Matrix; 30import android.graphics.Paint; 31import android.graphics.PixelFormat; 32import android.graphics.Point; 33import android.graphics.PorterDuff; 34import android.graphics.PorterDuffXfermode; 35import android.graphics.Rect; 36import android.graphics.RectF; 37import android.graphics.Region; 38import android.graphics.Shader; 39import android.graphics.drawable.ColorDrawable; 40import android.graphics.drawable.Drawable; 41import android.os.Handler; 42import android.os.IBinder; 43import android.os.Message; 44import android.os.Parcel; 45import android.os.Parcelable; 46import android.os.RemoteException; 47import android.os.SystemClock; 48import android.text.TextUtils; 49import android.util.AttributeSet; 50import android.util.FloatProperty; 51import android.util.LocaleUtil; 52import android.util.Log; 53import android.util.Pool; 54import android.util.Poolable; 55import android.util.PoolableManager; 56import android.util.Pools; 57import android.util.Property; 58import android.util.SparseArray; 59import android.util.TypedValue; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.accessibility.AccessibilityEvent; 62import android.view.accessibility.AccessibilityEventSource; 63import android.view.accessibility.AccessibilityManager; 64import android.view.accessibility.AccessibilityNodeInfo; 65import android.view.animation.Animation; 66import android.view.animation.AnimationUtils; 67import android.view.inputmethod.EditorInfo; 68import android.view.inputmethod.InputConnection; 69import android.view.inputmethod.InputMethodManager; 70import android.widget.ScrollBarDrawable; 71 72import static android.os.Build.VERSION_CODES.*; 73 74import com.android.internal.R; 75import com.android.internal.util.Predicate; 76import com.android.internal.view.menu.MenuBuilder; 77 78import java.lang.ref.WeakReference; 79import java.lang.reflect.InvocationTargetException; 80import java.lang.reflect.Method; 81import java.util.ArrayList; 82import java.util.Arrays; 83import java.util.Locale; 84import java.util.concurrent.CopyOnWriteArrayList; 85 86/** 87 * <p> 88 * This class represents the basic building block for user interface components. A View 89 * occupies a rectangular area on the screen and is responsible for drawing and 90 * event handling. View is the base class for <em>widgets</em>, which are 91 * used to create interactive UI components (buttons, text fields, etc.). The 92 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 93 * are invisible containers that hold other Views (or other ViewGroups) and define 94 * their layout properties. 95 * </p> 96 * 97 * <div class="special"> 98 * <p>For an introduction to using this class to develop your 99 * application's user interface, read the Developer Guide documentation on 100 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 101 * include: 102 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 103 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 104 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 105 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 106 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 107 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 108 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 109 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 110 * </p> 111 * </div> 112 * 113 * <a name="Using"></a> 114 * <h3>Using Views</h3> 115 * <p> 116 * All of the views in a window are arranged in a single tree. You can add views 117 * either from code or by specifying a tree of views in one or more XML layout 118 * files. There are many specialized subclasses of views that act as controls or 119 * are capable of displaying text, images, or other content. 120 * </p> 121 * <p> 122 * Once you have created a tree of views, there are typically a few types of 123 * common operations you may wish to perform: 124 * <ul> 125 * <li><strong>Set properties:</strong> for example setting the text of a 126 * {@link android.widget.TextView}. The available properties and the methods 127 * that set them will vary among the different subclasses of views. Note that 128 * properties that are known at build time can be set in the XML layout 129 * files.</li> 130 * <li><strong>Set focus:</strong> The framework will handled moving focus in 131 * response to user input. To force focus to a specific view, call 132 * {@link #requestFocus}.</li> 133 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 134 * that will be notified when something interesting happens to the view. For 135 * example, all views will let you set a listener to be notified when the view 136 * gains or loses focus. You can register such a listener using 137 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 138 * Other view subclasses offer more specialized listeners. For example, a Button 139 * exposes a listener to notify clients when the button is clicked.</li> 140 * <li><strong>Set visibility:</strong> You can hide or show views using 141 * {@link #setVisibility(int)}.</li> 142 * </ul> 143 * </p> 144 * <p><em> 145 * Note: The Android framework is responsible for measuring, laying out and 146 * drawing views. You should not call methods that perform these actions on 147 * views yourself unless you are actually implementing a 148 * {@link android.view.ViewGroup}. 149 * </em></p> 150 * 151 * <a name="Lifecycle"></a> 152 * <h3>Implementing a Custom View</h3> 153 * 154 * <p> 155 * To implement a custom view, you will usually begin by providing overrides for 156 * some of the standard methods that the framework calls on all views. You do 157 * not need to override all of these methods. In fact, you can start by just 158 * overriding {@link #onDraw(android.graphics.Canvas)}. 159 * <table border="2" width="85%" align="center" cellpadding="5"> 160 * <thead> 161 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 162 * </thead> 163 * 164 * <tbody> 165 * <tr> 166 * <td rowspan="2">Creation</td> 167 * <td>Constructors</td> 168 * <td>There is a form of the constructor that are called when the view 169 * is created from code and a form that is called when the view is 170 * inflated from a layout file. The second form should parse and apply 171 * any attributes defined in the layout file. 172 * </td> 173 * </tr> 174 * <tr> 175 * <td><code>{@link #onFinishInflate()}</code></td> 176 * <td>Called after a view and all of its children has been inflated 177 * from XML.</td> 178 * </tr> 179 * 180 * <tr> 181 * <td rowspan="3">Layout</td> 182 * <td><code>{@link #onMeasure(int, int)}</code></td> 183 * <td>Called to determine the size requirements for this view and all 184 * of its children. 185 * </td> 186 * </tr> 187 * <tr> 188 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 189 * <td>Called when this view should assign a size and position to all 190 * of its children. 191 * </td> 192 * </tr> 193 * <tr> 194 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 195 * <td>Called when the size of this view has changed. 196 * </td> 197 * </tr> 198 * 199 * <tr> 200 * <td>Drawing</td> 201 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 202 * <td>Called when the view should render its content. 203 * </td> 204 * </tr> 205 * 206 * <tr> 207 * <td rowspan="4">Event processing</td> 208 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 209 * <td>Called when a new key event occurs. 210 * </td> 211 * </tr> 212 * <tr> 213 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 214 * <td>Called when a key up event occurs. 215 * </td> 216 * </tr> 217 * <tr> 218 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 219 * <td>Called when a trackball motion event occurs. 220 * </td> 221 * </tr> 222 * <tr> 223 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 224 * <td>Called when a touch screen motion event occurs. 225 * </td> 226 * </tr> 227 * 228 * <tr> 229 * <td rowspan="2">Focus</td> 230 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 231 * <td>Called when the view gains or loses focus. 232 * </td> 233 * </tr> 234 * 235 * <tr> 236 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 237 * <td>Called when the window containing the view gains or loses focus. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td rowspan="3">Attaching</td> 243 * <td><code>{@link #onAttachedToWindow()}</code></td> 244 * <td>Called when the view is attached to a window. 245 * </td> 246 * </tr> 247 * 248 * <tr> 249 * <td><code>{@link #onDetachedFromWindow}</code></td> 250 * <td>Called when the view is detached from its window. 251 * </td> 252 * </tr> 253 * 254 * <tr> 255 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 256 * <td>Called when the visibility of the window containing the view 257 * has changed. 258 * </td> 259 * </tr> 260 * </tbody> 261 * 262 * </table> 263 * </p> 264 * 265 * <a name="IDs"></a> 266 * <h3>IDs</h3> 267 * Views may have an integer id associated with them. These ids are typically 268 * assigned in the layout XML files, and are used to find specific views within 269 * the view tree. A common pattern is to: 270 * <ul> 271 * <li>Define a Button in the layout file and assign it a unique ID. 272 * <pre> 273 * <Button 274 * android:id="@+id/my_button" 275 * android:layout_width="wrap_content" 276 * android:layout_height="wrap_content" 277 * android:text="@string/my_button_text"/> 278 * </pre></li> 279 * <li>From the onCreate method of an Activity, find the Button 280 * <pre class="prettyprint"> 281 * Button myButton = (Button) findViewById(R.id.my_button); 282 * </pre></li> 283 * </ul> 284 * <p> 285 * View IDs need not be unique throughout the tree, but it is good practice to 286 * ensure that they are at least unique within the part of the tree you are 287 * searching. 288 * </p> 289 * 290 * <a name="Position"></a> 291 * <h3>Position</h3> 292 * <p> 293 * The geometry of a view is that of a rectangle. A view has a location, 294 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 295 * two dimensions, expressed as a width and a height. The unit for location 296 * and dimensions is the pixel. 297 * </p> 298 * 299 * <p> 300 * It is possible to retrieve the location of a view by invoking the methods 301 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 302 * coordinate of the rectangle representing the view. The latter returns the 303 * top, or Y, coordinate of the rectangle representing the view. These methods 304 * both return the location of the view relative to its parent. For instance, 305 * when getLeft() returns 20, that means the view is located 20 pixels to the 306 * right of the left edge of its direct parent. 307 * </p> 308 * 309 * <p> 310 * In addition, several convenience methods are offered to avoid unnecessary 311 * computations, namely {@link #getRight()} and {@link #getBottom()}. 312 * These methods return the coordinates of the right and bottom edges of the 313 * rectangle representing the view. For instance, calling {@link #getRight()} 314 * is similar to the following computation: <code>getLeft() + getWidth()</code> 315 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 316 * </p> 317 * 318 * <a name="SizePaddingMargins"></a> 319 * <h3>Size, padding and margins</h3> 320 * <p> 321 * The size of a view is expressed with a width and a height. A view actually 322 * possess two pairs of width and height values. 323 * </p> 324 * 325 * <p> 326 * The first pair is known as <em>measured width</em> and 327 * <em>measured height</em>. These dimensions define how big a view wants to be 328 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 329 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 330 * and {@link #getMeasuredHeight()}. 331 * </p> 332 * 333 * <p> 334 * The second pair is simply known as <em>width</em> and <em>height</em>, or 335 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 336 * dimensions define the actual size of the view on screen, at drawing time and 337 * after layout. These values may, but do not have to, be different from the 338 * measured width and height. The width and height can be obtained by calling 339 * {@link #getWidth()} and {@link #getHeight()}. 340 * </p> 341 * 342 * <p> 343 * To measure its dimensions, a view takes into account its padding. The padding 344 * is expressed in pixels for the left, top, right and bottom parts of the view. 345 * Padding can be used to offset the content of the view by a specific amount of 346 * pixels. For instance, a left padding of 2 will push the view's content by 347 * 2 pixels to the right of the left edge. Padding can be set using the 348 * {@link #setPadding(int, int, int, int)} method and queried by calling 349 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 350 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}. 351 * </p> 352 * 353 * <p> 354 * Even though a view can define a padding, it does not provide any support for 355 * margins. However, view groups provide such a support. Refer to 356 * {@link android.view.ViewGroup} and 357 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 358 * </p> 359 * 360 * <a name="Layout"></a> 361 * <h3>Layout</h3> 362 * <p> 363 * Layout is a two pass process: a measure pass and a layout pass. The measuring 364 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 365 * of the view tree. Each view pushes dimension specifications down the tree 366 * during the recursion. At the end of the measure pass, every view has stored 367 * its measurements. The second pass happens in 368 * {@link #layout(int,int,int,int)} and is also top-down. During 369 * this pass each parent is responsible for positioning all of its children 370 * using the sizes computed in the measure pass. 371 * </p> 372 * 373 * <p> 374 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 375 * {@link #getMeasuredHeight()} values must be set, along with those for all of 376 * that view's descendants. A view's measured width and measured height values 377 * must respect the constraints imposed by the view's parents. This guarantees 378 * that at the end of the measure pass, all parents accept all of their 379 * children's measurements. A parent view may call measure() more than once on 380 * its children. For example, the parent may measure each child once with 381 * unspecified dimensions to find out how big they want to be, then call 382 * measure() on them again with actual numbers if the sum of all the children's 383 * unconstrained sizes is too big or too small. 384 * </p> 385 * 386 * <p> 387 * The measure pass uses two classes to communicate dimensions. The 388 * {@link MeasureSpec} class is used by views to tell their parents how they 389 * want to be measured and positioned. The base LayoutParams class just 390 * describes how big the view wants to be for both width and height. For each 391 * dimension, it can specify one of: 392 * <ul> 393 * <li> an exact number 394 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 395 * (minus padding) 396 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 397 * enclose its content (plus padding). 398 * </ul> 399 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 400 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 401 * an X and Y value. 402 * </p> 403 * 404 * <p> 405 * MeasureSpecs are used to push requirements down the tree from parent to 406 * child. A MeasureSpec can be in one of three modes: 407 * <ul> 408 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 409 * of a child view. For example, a LinearLayout may call measure() on its child 410 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 411 * tall the child view wants to be given a width of 240 pixels. 412 * <li>EXACTLY: This is used by the parent to impose an exact size on the 413 * child. The child must use this size, and guarantee that all of its 414 * descendants will fit within this size. 415 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 416 * child. The child must gurantee that it and all of its descendants will fit 417 * within this size. 418 * </ul> 419 * </p> 420 * 421 * <p> 422 * To intiate a layout, call {@link #requestLayout}. This method is typically 423 * called by a view on itself when it believes that is can no longer fit within 424 * its current bounds. 425 * </p> 426 * 427 * <a name="Drawing"></a> 428 * <h3>Drawing</h3> 429 * <p> 430 * Drawing is handled by walking the tree and rendering each view that 431 * intersects the the invalid region. Because the tree is traversed in-order, 432 * this means that parents will draw before (i.e., behind) their children, with 433 * siblings drawn in the order they appear in the tree. 434 * If you set a background drawable for a View, then the View will draw it for you 435 * before calling back to its <code>onDraw()</code> method. 436 * </p> 437 * 438 * <p> 439 * Note that the framework will not draw views that are not in the invalid region. 440 * </p> 441 * 442 * <p> 443 * To force a view to draw, call {@link #invalidate()}. 444 * </p> 445 * 446 * <a name="EventHandlingThreading"></a> 447 * <h3>Event Handling and Threading</h3> 448 * <p> 449 * The basic cycle of a view is as follows: 450 * <ol> 451 * <li>An event comes in and is dispatched to the appropriate view. The view 452 * handles the event and notifies any listeners.</li> 453 * <li>If in the course of processing the event, the view's bounds may need 454 * to be changed, the view will call {@link #requestLayout()}.</li> 455 * <li>Similarly, if in the course of processing the event the view's appearance 456 * may need to be changed, the view will call {@link #invalidate()}.</li> 457 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 458 * the framework will take care of measuring, laying out, and drawing the tree 459 * as appropriate.</li> 460 * </ol> 461 * </p> 462 * 463 * <p><em>Note: The entire view tree is single threaded. You must always be on 464 * the UI thread when calling any method on any view.</em> 465 * If you are doing work on other threads and want to update the state of a view 466 * from that thread, you should use a {@link Handler}. 467 * </p> 468 * 469 * <a name="FocusHandling"></a> 470 * <h3>Focus Handling</h3> 471 * <p> 472 * The framework will handle routine focus movement in response to user input. 473 * This includes changing the focus as views are removed or hidden, or as new 474 * views become available. Views indicate their willingness to take focus 475 * through the {@link #isFocusable} method. To change whether a view can take 476 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 477 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 478 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 479 * </p> 480 * <p> 481 * Focus movement is based on an algorithm which finds the nearest neighbor in a 482 * given direction. In rare cases, the default algorithm may not match the 483 * intended behavior of the developer. In these situations, you can provide 484 * explicit overrides by using these XML attributes in the layout file: 485 * <pre> 486 * nextFocusDown 487 * nextFocusLeft 488 * nextFocusRight 489 * nextFocusUp 490 * </pre> 491 * </p> 492 * 493 * 494 * <p> 495 * To get a particular view to take focus, call {@link #requestFocus()}. 496 * </p> 497 * 498 * <a name="TouchMode"></a> 499 * <h3>Touch Mode</h3> 500 * <p> 501 * When a user is navigating a user interface via directional keys such as a D-pad, it is 502 * necessary to give focus to actionable items such as buttons so the user can see 503 * what will take input. If the device has touch capabilities, however, and the user 504 * begins interacting with the interface by touching it, it is no longer necessary to 505 * always highlight, or give focus to, a particular view. This motivates a mode 506 * for interaction named 'touch mode'. 507 * </p> 508 * <p> 509 * For a touch capable device, once the user touches the screen, the device 510 * will enter touch mode. From this point onward, only views for which 511 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 512 * Other views that are touchable, like buttons, will not take focus when touched; they will 513 * only fire the on click listeners. 514 * </p> 515 * <p> 516 * Any time a user hits a directional key, such as a D-pad direction, the view device will 517 * exit touch mode, and find a view to take focus, so that the user may resume interacting 518 * with the user interface without touching the screen again. 519 * </p> 520 * <p> 521 * The touch mode state is maintained across {@link android.app.Activity}s. Call 522 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 523 * </p> 524 * 525 * <a name="Scrolling"></a> 526 * <h3>Scrolling</h3> 527 * <p> 528 * The framework provides basic support for views that wish to internally 529 * scroll their content. This includes keeping track of the X and Y scroll 530 * offset as well as mechanisms for drawing scrollbars. See 531 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 532 * {@link #awakenScrollBars()} for more details. 533 * </p> 534 * 535 * <a name="Tags"></a> 536 * <h3>Tags</h3> 537 * <p> 538 * Unlike IDs, tags are not used to identify views. Tags are essentially an 539 * extra piece of information that can be associated with a view. They are most 540 * often used as a convenience to store data related to views in the views 541 * themselves rather than by putting them in a separate structure. 542 * </p> 543 * 544 * <a name="Animation"></a> 545 * <h3>Animation</h3> 546 * <p> 547 * You can attach an {@link Animation} object to a view using 548 * {@link #setAnimation(Animation)} or 549 * {@link #startAnimation(Animation)}. The animation can alter the scale, 550 * rotation, translation and alpha of a view over time. If the animation is 551 * attached to a view that has children, the animation will affect the entire 552 * subtree rooted by that node. When an animation is started, the framework will 553 * take care of redrawing the appropriate views until the animation completes. 554 * </p> 555 * <p> 556 * Starting with Android 3.0, the preferred way of animating views is to use the 557 * {@link android.animation} package APIs. 558 * </p> 559 * 560 * <a name="Security"></a> 561 * <h3>Security</h3> 562 * <p> 563 * Sometimes it is essential that an application be able to verify that an action 564 * is being performed with the full knowledge and consent of the user, such as 565 * granting a permission request, making a purchase or clicking on an advertisement. 566 * Unfortunately, a malicious application could try to spoof the user into 567 * performing these actions, unaware, by concealing the intended purpose of the view. 568 * As a remedy, the framework offers a touch filtering mechanism that can be used to 569 * improve the security of views that provide access to sensitive functionality. 570 * </p><p> 571 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 572 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 573 * will discard touches that are received whenever the view's window is obscured by 574 * another visible window. As a result, the view will not receive touches whenever a 575 * toast, dialog or other window appears above the view's window. 576 * </p><p> 577 * For more fine-grained control over security, consider overriding the 578 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 579 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 580 * </p> 581 * 582 * @attr ref android.R.styleable#View_alpha 583 * @attr ref android.R.styleable#View_background 584 * @attr ref android.R.styleable#View_clickable 585 * @attr ref android.R.styleable#View_contentDescription 586 * @attr ref android.R.styleable#View_drawingCacheQuality 587 * @attr ref android.R.styleable#View_duplicateParentState 588 * @attr ref android.R.styleable#View_id 589 * @attr ref android.R.styleable#View_requiresFadingEdge 590 * @attr ref android.R.styleable#View_fadingEdgeLength 591 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 592 * @attr ref android.R.styleable#View_fitsSystemWindows 593 * @attr ref android.R.styleable#View_isScrollContainer 594 * @attr ref android.R.styleable#View_focusable 595 * @attr ref android.R.styleable#View_focusableInTouchMode 596 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 597 * @attr ref android.R.styleable#View_keepScreenOn 598 * @attr ref android.R.styleable#View_layerType 599 * @attr ref android.R.styleable#View_longClickable 600 * @attr ref android.R.styleable#View_minHeight 601 * @attr ref android.R.styleable#View_minWidth 602 * @attr ref android.R.styleable#View_nextFocusDown 603 * @attr ref android.R.styleable#View_nextFocusLeft 604 * @attr ref android.R.styleable#View_nextFocusRight 605 * @attr ref android.R.styleable#View_nextFocusUp 606 * @attr ref android.R.styleable#View_onClick 607 * @attr ref android.R.styleable#View_padding 608 * @attr ref android.R.styleable#View_paddingBottom 609 * @attr ref android.R.styleable#View_paddingLeft 610 * @attr ref android.R.styleable#View_paddingRight 611 * @attr ref android.R.styleable#View_paddingTop 612 * @attr ref android.R.styleable#View_saveEnabled 613 * @attr ref android.R.styleable#View_rotation 614 * @attr ref android.R.styleable#View_rotationX 615 * @attr ref android.R.styleable#View_rotationY 616 * @attr ref android.R.styleable#View_scaleX 617 * @attr ref android.R.styleable#View_scaleY 618 * @attr ref android.R.styleable#View_scrollX 619 * @attr ref android.R.styleable#View_scrollY 620 * @attr ref android.R.styleable#View_scrollbarSize 621 * @attr ref android.R.styleable#View_scrollbarStyle 622 * @attr ref android.R.styleable#View_scrollbars 623 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 624 * @attr ref android.R.styleable#View_scrollbarFadeDuration 625 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 626 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 627 * @attr ref android.R.styleable#View_scrollbarThumbVertical 628 * @attr ref android.R.styleable#View_scrollbarTrackVertical 629 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 630 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 631 * @attr ref android.R.styleable#View_soundEffectsEnabled 632 * @attr ref android.R.styleable#View_tag 633 * @attr ref android.R.styleable#View_transformPivotX 634 * @attr ref android.R.styleable#View_transformPivotY 635 * @attr ref android.R.styleable#View_translationX 636 * @attr ref android.R.styleable#View_translationY 637 * @attr ref android.R.styleable#View_visibility 638 * 639 * @see android.view.ViewGroup 640 */ 641public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 642 AccessibilityEventSource { 643 private static final boolean DBG = false; 644 645 /** 646 * The logging tag used by this class with android.util.Log. 647 */ 648 protected static final String VIEW_LOG_TAG = "View"; 649 650 /** 651 * Used to mark a View that has no ID. 652 */ 653 public static final int NO_ID = -1; 654 655 /** 656 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 657 * calling setFlags. 658 */ 659 private static final int NOT_FOCUSABLE = 0x00000000; 660 661 /** 662 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 663 * setFlags. 664 */ 665 private static final int FOCUSABLE = 0x00000001; 666 667 /** 668 * Mask for use with setFlags indicating bits used for focus. 669 */ 670 private static final int FOCUSABLE_MASK = 0x00000001; 671 672 /** 673 * This view will adjust its padding to fit sytem windows (e.g. status bar) 674 */ 675 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 676 677 /** 678 * This view is visible. 679 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 680 * android:visibility}. 681 */ 682 public static final int VISIBLE = 0x00000000; 683 684 /** 685 * This view is invisible, but it still takes up space for layout purposes. 686 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 687 * android:visibility}. 688 */ 689 public static final int INVISIBLE = 0x00000004; 690 691 /** 692 * This view is invisible, and it doesn't take any space for layout 693 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 694 * android:visibility}. 695 */ 696 public static final int GONE = 0x00000008; 697 698 /** 699 * Mask for use with setFlags indicating bits used for visibility. 700 * {@hide} 701 */ 702 static final int VISIBILITY_MASK = 0x0000000C; 703 704 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 705 706 /** 707 * This view is enabled. Intrepretation varies by subclass. 708 * Use with ENABLED_MASK when calling setFlags. 709 * {@hide} 710 */ 711 static final int ENABLED = 0x00000000; 712 713 /** 714 * This view is disabled. Intrepretation varies by subclass. 715 * Use with ENABLED_MASK when calling setFlags. 716 * {@hide} 717 */ 718 static final int DISABLED = 0x00000020; 719 720 /** 721 * Mask for use with setFlags indicating bits used for indicating whether 722 * this view is enabled 723 * {@hide} 724 */ 725 static final int ENABLED_MASK = 0x00000020; 726 727 /** 728 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 729 * called and further optimizations will be performed. It is okay to have 730 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 731 * {@hide} 732 */ 733 static final int WILL_NOT_DRAW = 0x00000080; 734 735 /** 736 * Mask for use with setFlags indicating bits used for indicating whether 737 * this view is will draw 738 * {@hide} 739 */ 740 static final int DRAW_MASK = 0x00000080; 741 742 /** 743 * <p>This view doesn't show scrollbars.</p> 744 * {@hide} 745 */ 746 static final int SCROLLBARS_NONE = 0x00000000; 747 748 /** 749 * <p>This view shows horizontal scrollbars.</p> 750 * {@hide} 751 */ 752 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 753 754 /** 755 * <p>This view shows vertical scrollbars.</p> 756 * {@hide} 757 */ 758 static final int SCROLLBARS_VERTICAL = 0x00000200; 759 760 /** 761 * <p>Mask for use with setFlags indicating bits used for indicating which 762 * scrollbars are enabled.</p> 763 * {@hide} 764 */ 765 static final int SCROLLBARS_MASK = 0x00000300; 766 767 /** 768 * Indicates that the view should filter touches when its window is obscured. 769 * Refer to the class comments for more information about this security feature. 770 * {@hide} 771 */ 772 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 773 774 // note flag value 0x00000800 is now available for next flags... 775 776 /** 777 * <p>This view doesn't show fading edges.</p> 778 * {@hide} 779 */ 780 static final int FADING_EDGE_NONE = 0x00000000; 781 782 /** 783 * <p>This view shows horizontal fading edges.</p> 784 * {@hide} 785 */ 786 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 787 788 /** 789 * <p>This view shows vertical fading edges.</p> 790 * {@hide} 791 */ 792 static final int FADING_EDGE_VERTICAL = 0x00002000; 793 794 /** 795 * <p>Mask for use with setFlags indicating bits used for indicating which 796 * fading edges are enabled.</p> 797 * {@hide} 798 */ 799 static final int FADING_EDGE_MASK = 0x00003000; 800 801 /** 802 * <p>Indicates this view can be clicked. When clickable, a View reacts 803 * to clicks by notifying the OnClickListener.<p> 804 * {@hide} 805 */ 806 static final int CLICKABLE = 0x00004000; 807 808 /** 809 * <p>Indicates this view is caching its drawing into a bitmap.</p> 810 * {@hide} 811 */ 812 static final int DRAWING_CACHE_ENABLED = 0x00008000; 813 814 /** 815 * <p>Indicates that no icicle should be saved for this view.<p> 816 * {@hide} 817 */ 818 static final int SAVE_DISABLED = 0x000010000; 819 820 /** 821 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 822 * property.</p> 823 * {@hide} 824 */ 825 static final int SAVE_DISABLED_MASK = 0x000010000; 826 827 /** 828 * <p>Indicates that no drawing cache should ever be created for this view.<p> 829 * {@hide} 830 */ 831 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 832 833 /** 834 * <p>Indicates this view can take / keep focus when int touch mode.</p> 835 * {@hide} 836 */ 837 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 838 839 /** 840 * <p>Enables low quality mode for the drawing cache.</p> 841 */ 842 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 843 844 /** 845 * <p>Enables high quality mode for the drawing cache.</p> 846 */ 847 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 848 849 /** 850 * <p>Enables automatic quality mode for the drawing cache.</p> 851 */ 852 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 853 854 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 855 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 856 }; 857 858 /** 859 * <p>Mask for use with setFlags indicating bits used for the cache 860 * quality property.</p> 861 * {@hide} 862 */ 863 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 864 865 /** 866 * <p> 867 * Indicates this view can be long clicked. When long clickable, a View 868 * reacts to long clicks by notifying the OnLongClickListener or showing a 869 * context menu. 870 * </p> 871 * {@hide} 872 */ 873 static final int LONG_CLICKABLE = 0x00200000; 874 875 /** 876 * <p>Indicates that this view gets its drawable states from its direct parent 877 * and ignores its original internal states.</p> 878 * 879 * @hide 880 */ 881 static final int DUPLICATE_PARENT_STATE = 0x00400000; 882 883 /** 884 * The scrollbar style to display the scrollbars inside the content area, 885 * without increasing the padding. The scrollbars will be overlaid with 886 * translucency on the view's content. 887 */ 888 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 889 890 /** 891 * The scrollbar style to display the scrollbars inside the padded area, 892 * increasing the padding of the view. The scrollbars will not overlap the 893 * content area of the view. 894 */ 895 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 896 897 /** 898 * The scrollbar style to display the scrollbars at the edge of the view, 899 * without increasing the padding. The scrollbars will be overlaid with 900 * translucency. 901 */ 902 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 903 904 /** 905 * The scrollbar style to display the scrollbars at the edge of the view, 906 * increasing the padding of the view. The scrollbars will only overlap the 907 * background, if any. 908 */ 909 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 910 911 /** 912 * Mask to check if the scrollbar style is overlay or inset. 913 * {@hide} 914 */ 915 static final int SCROLLBARS_INSET_MASK = 0x01000000; 916 917 /** 918 * Mask to check if the scrollbar style is inside or outside. 919 * {@hide} 920 */ 921 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 922 923 /** 924 * Mask for scrollbar style. 925 * {@hide} 926 */ 927 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 928 929 /** 930 * View flag indicating that the screen should remain on while the 931 * window containing this view is visible to the user. This effectively 932 * takes care of automatically setting the WindowManager's 933 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 934 */ 935 public static final int KEEP_SCREEN_ON = 0x04000000; 936 937 /** 938 * View flag indicating whether this view should have sound effects enabled 939 * for events such as clicking and touching. 940 */ 941 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 942 943 /** 944 * View flag indicating whether this view should have haptic feedback 945 * enabled for events such as long presses. 946 */ 947 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 948 949 /** 950 * <p>Indicates that the view hierarchy should stop saving state when 951 * it reaches this view. If state saving is initiated immediately at 952 * the view, it will be allowed. 953 * {@hide} 954 */ 955 static final int PARENT_SAVE_DISABLED = 0x20000000; 956 957 /** 958 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 959 * {@hide} 960 */ 961 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 962 963 /** 964 * Horizontal direction of this view is from Left to Right. 965 * Use with {@link #setLayoutDirection}. 966 * {@hide} 967 */ 968 public static final int LAYOUT_DIRECTION_LTR = 0x00000000; 969 970 /** 971 * Horizontal direction of this view is from Right to Left. 972 * Use with {@link #setLayoutDirection}. 973 * {@hide} 974 */ 975 public static final int LAYOUT_DIRECTION_RTL = 0x40000000; 976 977 /** 978 * Horizontal direction of this view is inherited from its parent. 979 * Use with {@link #setLayoutDirection}. 980 * {@hide} 981 */ 982 public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000; 983 984 /** 985 * Horizontal direction of this view is from deduced from the default language 986 * script for the locale. Use with {@link #setLayoutDirection}. 987 * {@hide} 988 */ 989 public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000; 990 991 /** 992 * Mask for use with setFlags indicating bits used for horizontalDirection. 993 * {@hide} 994 */ 995 static final int LAYOUT_DIRECTION_MASK = 0xC0000000; 996 997 /* 998 * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct 999 * flag value. 1000 * {@hide} 1001 */ 1002 private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR, 1003 LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE}; 1004 1005 /** 1006 * Default horizontalDirection. 1007 * {@hide} 1008 */ 1009 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1010 1011 /** 1012 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1013 * should add all focusable Views regardless if they are focusable in touch mode. 1014 */ 1015 public static final int FOCUSABLES_ALL = 0x00000000; 1016 1017 /** 1018 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1019 * should add only Views focusable in touch mode. 1020 */ 1021 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1022 1023 /** 1024 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1025 * item. 1026 */ 1027 public static final int FOCUS_BACKWARD = 0x00000001; 1028 1029 /** 1030 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1031 * item. 1032 */ 1033 public static final int FOCUS_FORWARD = 0x00000002; 1034 1035 /** 1036 * Use with {@link #focusSearch(int)}. Move focus to the left. 1037 */ 1038 public static final int FOCUS_LEFT = 0x00000011; 1039 1040 /** 1041 * Use with {@link #focusSearch(int)}. Move focus up. 1042 */ 1043 public static final int FOCUS_UP = 0x00000021; 1044 1045 /** 1046 * Use with {@link #focusSearch(int)}. Move focus to the right. 1047 */ 1048 public static final int FOCUS_RIGHT = 0x00000042; 1049 1050 /** 1051 * Use with {@link #focusSearch(int)}. Move focus down. 1052 */ 1053 public static final int FOCUS_DOWN = 0x00000082; 1054 1055 /** 1056 * Bits of {@link #getMeasuredWidthAndState()} and 1057 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1058 */ 1059 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1060 1061 /** 1062 * Bits of {@link #getMeasuredWidthAndState()} and 1063 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1064 */ 1065 public static final int MEASURED_STATE_MASK = 0xff000000; 1066 1067 /** 1068 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1069 * for functions that combine both width and height into a single int, 1070 * such as {@link #getMeasuredState()} and the childState argument of 1071 * {@link #resolveSizeAndState(int, int, int)}. 1072 */ 1073 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1074 1075 /** 1076 * Bit of {@link #getMeasuredWidthAndState()} and 1077 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1078 * is smaller that the space the view would like to have. 1079 */ 1080 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1081 1082 /** 1083 * Base View state sets 1084 */ 1085 // Singles 1086 /** 1087 * Indicates the view has no states set. States are used with 1088 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1089 * view depending on its state. 1090 * 1091 * @see android.graphics.drawable.Drawable 1092 * @see #getDrawableState() 1093 */ 1094 protected static final int[] EMPTY_STATE_SET; 1095 /** 1096 * Indicates the view is enabled. States are used with 1097 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1098 * view depending on its state. 1099 * 1100 * @see android.graphics.drawable.Drawable 1101 * @see #getDrawableState() 1102 */ 1103 protected static final int[] ENABLED_STATE_SET; 1104 /** 1105 * Indicates the view is focused. States are used with 1106 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1107 * view depending on its state. 1108 * 1109 * @see android.graphics.drawable.Drawable 1110 * @see #getDrawableState() 1111 */ 1112 protected static final int[] FOCUSED_STATE_SET; 1113 /** 1114 * Indicates the view is selected. States are used with 1115 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1116 * view depending on its state. 1117 * 1118 * @see android.graphics.drawable.Drawable 1119 * @see #getDrawableState() 1120 */ 1121 protected static final int[] SELECTED_STATE_SET; 1122 /** 1123 * Indicates the view is pressed. States are used with 1124 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1125 * view depending on its state. 1126 * 1127 * @see android.graphics.drawable.Drawable 1128 * @see #getDrawableState() 1129 * @hide 1130 */ 1131 protected static final int[] PRESSED_STATE_SET; 1132 /** 1133 * Indicates the view's window has focus. States are used with 1134 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1135 * view depending on its state. 1136 * 1137 * @see android.graphics.drawable.Drawable 1138 * @see #getDrawableState() 1139 */ 1140 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1141 // Doubles 1142 /** 1143 * Indicates the view is enabled and has the focus. 1144 * 1145 * @see #ENABLED_STATE_SET 1146 * @see #FOCUSED_STATE_SET 1147 */ 1148 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1149 /** 1150 * Indicates the view is enabled and selected. 1151 * 1152 * @see #ENABLED_STATE_SET 1153 * @see #SELECTED_STATE_SET 1154 */ 1155 protected static final int[] ENABLED_SELECTED_STATE_SET; 1156 /** 1157 * Indicates the view is enabled and that its window has focus. 1158 * 1159 * @see #ENABLED_STATE_SET 1160 * @see #WINDOW_FOCUSED_STATE_SET 1161 */ 1162 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1163 /** 1164 * Indicates the view is focused and selected. 1165 * 1166 * @see #FOCUSED_STATE_SET 1167 * @see #SELECTED_STATE_SET 1168 */ 1169 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1170 /** 1171 * Indicates the view has the focus and that its window has the focus. 1172 * 1173 * @see #FOCUSED_STATE_SET 1174 * @see #WINDOW_FOCUSED_STATE_SET 1175 */ 1176 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1177 /** 1178 * Indicates the view is selected and that its window has the focus. 1179 * 1180 * @see #SELECTED_STATE_SET 1181 * @see #WINDOW_FOCUSED_STATE_SET 1182 */ 1183 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1184 // Triples 1185 /** 1186 * Indicates the view is enabled, focused and selected. 1187 * 1188 * @see #ENABLED_STATE_SET 1189 * @see #FOCUSED_STATE_SET 1190 * @see #SELECTED_STATE_SET 1191 */ 1192 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1193 /** 1194 * Indicates the view is enabled, focused and its window has the focus. 1195 * 1196 * @see #ENABLED_STATE_SET 1197 * @see #FOCUSED_STATE_SET 1198 * @see #WINDOW_FOCUSED_STATE_SET 1199 */ 1200 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1201 /** 1202 * Indicates the view is enabled, selected and its window has the focus. 1203 * 1204 * @see #ENABLED_STATE_SET 1205 * @see #SELECTED_STATE_SET 1206 * @see #WINDOW_FOCUSED_STATE_SET 1207 */ 1208 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1209 /** 1210 * Indicates the view is focused, selected and its window has the focus. 1211 * 1212 * @see #FOCUSED_STATE_SET 1213 * @see #SELECTED_STATE_SET 1214 * @see #WINDOW_FOCUSED_STATE_SET 1215 */ 1216 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1217 /** 1218 * Indicates the view is enabled, focused, selected and its window 1219 * has the focus. 1220 * 1221 * @see #ENABLED_STATE_SET 1222 * @see #FOCUSED_STATE_SET 1223 * @see #SELECTED_STATE_SET 1224 * @see #WINDOW_FOCUSED_STATE_SET 1225 */ 1226 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1227 /** 1228 * Indicates the view is pressed and its window has the focus. 1229 * 1230 * @see #PRESSED_STATE_SET 1231 * @see #WINDOW_FOCUSED_STATE_SET 1232 */ 1233 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1234 /** 1235 * Indicates the view is pressed and selected. 1236 * 1237 * @see #PRESSED_STATE_SET 1238 * @see #SELECTED_STATE_SET 1239 */ 1240 protected static final int[] PRESSED_SELECTED_STATE_SET; 1241 /** 1242 * Indicates the view is pressed, selected and its window has the focus. 1243 * 1244 * @see #PRESSED_STATE_SET 1245 * @see #SELECTED_STATE_SET 1246 * @see #WINDOW_FOCUSED_STATE_SET 1247 */ 1248 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1249 /** 1250 * Indicates the view is pressed and focused. 1251 * 1252 * @see #PRESSED_STATE_SET 1253 * @see #FOCUSED_STATE_SET 1254 */ 1255 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1256 /** 1257 * Indicates the view is pressed, focused and its window has the focus. 1258 * 1259 * @see #PRESSED_STATE_SET 1260 * @see #FOCUSED_STATE_SET 1261 * @see #WINDOW_FOCUSED_STATE_SET 1262 */ 1263 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1264 /** 1265 * Indicates the view is pressed, focused and selected. 1266 * 1267 * @see #PRESSED_STATE_SET 1268 * @see #SELECTED_STATE_SET 1269 * @see #FOCUSED_STATE_SET 1270 */ 1271 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1272 /** 1273 * Indicates the view is pressed, focused, selected and its window has the focus. 1274 * 1275 * @see #PRESSED_STATE_SET 1276 * @see #FOCUSED_STATE_SET 1277 * @see #SELECTED_STATE_SET 1278 * @see #WINDOW_FOCUSED_STATE_SET 1279 */ 1280 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1281 /** 1282 * Indicates the view is pressed and enabled. 1283 * 1284 * @see #PRESSED_STATE_SET 1285 * @see #ENABLED_STATE_SET 1286 */ 1287 protected static final int[] PRESSED_ENABLED_STATE_SET; 1288 /** 1289 * Indicates the view is pressed, enabled and its window has the focus. 1290 * 1291 * @see #PRESSED_STATE_SET 1292 * @see #ENABLED_STATE_SET 1293 * @see #WINDOW_FOCUSED_STATE_SET 1294 */ 1295 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1296 /** 1297 * Indicates the view is pressed, enabled and selected. 1298 * 1299 * @see #PRESSED_STATE_SET 1300 * @see #ENABLED_STATE_SET 1301 * @see #SELECTED_STATE_SET 1302 */ 1303 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1304 /** 1305 * Indicates the view is pressed, enabled, selected and its window has the 1306 * focus. 1307 * 1308 * @see #PRESSED_STATE_SET 1309 * @see #ENABLED_STATE_SET 1310 * @see #SELECTED_STATE_SET 1311 * @see #WINDOW_FOCUSED_STATE_SET 1312 */ 1313 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1314 /** 1315 * Indicates the view is pressed, enabled and focused. 1316 * 1317 * @see #PRESSED_STATE_SET 1318 * @see #ENABLED_STATE_SET 1319 * @see #FOCUSED_STATE_SET 1320 */ 1321 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1322 /** 1323 * Indicates the view is pressed, enabled, focused and its window has the 1324 * focus. 1325 * 1326 * @see #PRESSED_STATE_SET 1327 * @see #ENABLED_STATE_SET 1328 * @see #FOCUSED_STATE_SET 1329 * @see #WINDOW_FOCUSED_STATE_SET 1330 */ 1331 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1332 /** 1333 * Indicates the view is pressed, enabled, focused and selected. 1334 * 1335 * @see #PRESSED_STATE_SET 1336 * @see #ENABLED_STATE_SET 1337 * @see #SELECTED_STATE_SET 1338 * @see #FOCUSED_STATE_SET 1339 */ 1340 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1341 /** 1342 * Indicates the view is pressed, enabled, focused, selected and its window 1343 * has the focus. 1344 * 1345 * @see #PRESSED_STATE_SET 1346 * @see #ENABLED_STATE_SET 1347 * @see #SELECTED_STATE_SET 1348 * @see #FOCUSED_STATE_SET 1349 * @see #WINDOW_FOCUSED_STATE_SET 1350 */ 1351 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1352 1353 /** 1354 * The order here is very important to {@link #getDrawableState()} 1355 */ 1356 private static final int[][] VIEW_STATE_SETS; 1357 1358 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1359 static final int VIEW_STATE_SELECTED = 1 << 1; 1360 static final int VIEW_STATE_FOCUSED = 1 << 2; 1361 static final int VIEW_STATE_ENABLED = 1 << 3; 1362 static final int VIEW_STATE_PRESSED = 1 << 4; 1363 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1364 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1365 static final int VIEW_STATE_HOVERED = 1 << 7; 1366 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1367 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1368 1369 static final int[] VIEW_STATE_IDS = new int[] { 1370 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1371 R.attr.state_selected, VIEW_STATE_SELECTED, 1372 R.attr.state_focused, VIEW_STATE_FOCUSED, 1373 R.attr.state_enabled, VIEW_STATE_ENABLED, 1374 R.attr.state_pressed, VIEW_STATE_PRESSED, 1375 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1376 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1377 R.attr.state_hovered, VIEW_STATE_HOVERED, 1378 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1379 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1380 }; 1381 1382 static { 1383 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1384 throw new IllegalStateException( 1385 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1386 } 1387 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1388 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1389 int viewState = R.styleable.ViewDrawableStates[i]; 1390 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1391 if (VIEW_STATE_IDS[j] == viewState) { 1392 orderedIds[i * 2] = viewState; 1393 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1394 } 1395 } 1396 } 1397 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1398 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1399 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1400 int numBits = Integer.bitCount(i); 1401 int[] set = new int[numBits]; 1402 int pos = 0; 1403 for (int j = 0; j < orderedIds.length; j += 2) { 1404 if ((i & orderedIds[j+1]) != 0) { 1405 set[pos++] = orderedIds[j]; 1406 } 1407 } 1408 VIEW_STATE_SETS[i] = set; 1409 } 1410 1411 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1412 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1413 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1414 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1415 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1416 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1417 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1418 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1419 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1420 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1421 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1422 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1423 | VIEW_STATE_FOCUSED]; 1424 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1425 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1426 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1427 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1428 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1429 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1430 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1431 | VIEW_STATE_ENABLED]; 1432 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1433 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1434 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1435 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1436 | VIEW_STATE_ENABLED]; 1437 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1438 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1439 | VIEW_STATE_ENABLED]; 1440 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1441 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1442 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1443 1444 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1445 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1447 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1448 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1449 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1451 | VIEW_STATE_PRESSED]; 1452 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1453 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1454 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1456 | VIEW_STATE_PRESSED]; 1457 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1459 | VIEW_STATE_PRESSED]; 1460 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1462 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1463 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1464 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1465 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1467 | VIEW_STATE_PRESSED]; 1468 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1470 | VIEW_STATE_PRESSED]; 1471 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1472 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1473 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1474 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1476 | VIEW_STATE_PRESSED]; 1477 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1479 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1480 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1482 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1483 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1484 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1485 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1486 | VIEW_STATE_PRESSED]; 1487 } 1488 1489 /** 1490 * Temporary Rect currently for use in setBackground(). This will probably 1491 * be extended in the future to hold our own class with more than just 1492 * a Rect. :) 1493 */ 1494 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1495 1496 /** 1497 * Map used to store views' tags. 1498 */ 1499 private SparseArray<Object> mKeyedTags; 1500 1501 /** 1502 * The next available accessiiblity id. 1503 */ 1504 private static int sNextAccessibilityViewId; 1505 1506 /** 1507 * The animation currently associated with this view. 1508 * @hide 1509 */ 1510 protected Animation mCurrentAnimation = null; 1511 1512 /** 1513 * Width as measured during measure pass. 1514 * {@hide} 1515 */ 1516 @ViewDebug.ExportedProperty(category = "measurement") 1517 int mMeasuredWidth; 1518 1519 /** 1520 * Height as measured during measure pass. 1521 * {@hide} 1522 */ 1523 @ViewDebug.ExportedProperty(category = "measurement") 1524 int mMeasuredHeight; 1525 1526 /** 1527 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1528 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1529 * its display list. This flag, used only when hw accelerated, allows us to clear the 1530 * flag while retaining this information until it's needed (at getDisplayList() time and 1531 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1532 * 1533 * {@hide} 1534 */ 1535 boolean mRecreateDisplayList = false; 1536 1537 /** 1538 * The view's identifier. 1539 * {@hide} 1540 * 1541 * @see #setId(int) 1542 * @see #getId() 1543 */ 1544 @ViewDebug.ExportedProperty(resolveId = true) 1545 int mID = NO_ID; 1546 1547 /** 1548 * The stable ID of this view for accessibility porposes. 1549 */ 1550 int mAccessibilityViewId = NO_ID; 1551 1552 /** 1553 * The view's tag. 1554 * {@hide} 1555 * 1556 * @see #setTag(Object) 1557 * @see #getTag() 1558 */ 1559 protected Object mTag; 1560 1561 // for mPrivateFlags: 1562 /** {@hide} */ 1563 static final int WANTS_FOCUS = 0x00000001; 1564 /** {@hide} */ 1565 static final int FOCUSED = 0x00000002; 1566 /** {@hide} */ 1567 static final int SELECTED = 0x00000004; 1568 /** {@hide} */ 1569 static final int IS_ROOT_NAMESPACE = 0x00000008; 1570 /** {@hide} */ 1571 static final int HAS_BOUNDS = 0x00000010; 1572 /** {@hide} */ 1573 static final int DRAWN = 0x00000020; 1574 /** 1575 * When this flag is set, this view is running an animation on behalf of its 1576 * children and should therefore not cancel invalidate requests, even if they 1577 * lie outside of this view's bounds. 1578 * 1579 * {@hide} 1580 */ 1581 static final int DRAW_ANIMATION = 0x00000040; 1582 /** {@hide} */ 1583 static final int SKIP_DRAW = 0x00000080; 1584 /** {@hide} */ 1585 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1586 /** {@hide} */ 1587 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1588 /** {@hide} */ 1589 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1590 /** {@hide} */ 1591 static final int MEASURED_DIMENSION_SET = 0x00000800; 1592 /** {@hide} */ 1593 static final int FORCE_LAYOUT = 0x00001000; 1594 /** {@hide} */ 1595 static final int LAYOUT_REQUIRED = 0x00002000; 1596 1597 private static final int PRESSED = 0x00004000; 1598 1599 /** {@hide} */ 1600 static final int DRAWING_CACHE_VALID = 0x00008000; 1601 /** 1602 * Flag used to indicate that this view should be drawn once more (and only once 1603 * more) after its animation has completed. 1604 * {@hide} 1605 */ 1606 static final int ANIMATION_STARTED = 0x00010000; 1607 1608 private static final int SAVE_STATE_CALLED = 0x00020000; 1609 1610 /** 1611 * Indicates that the View returned true when onSetAlpha() was called and that 1612 * the alpha must be restored. 1613 * {@hide} 1614 */ 1615 static final int ALPHA_SET = 0x00040000; 1616 1617 /** 1618 * Set by {@link #setScrollContainer(boolean)}. 1619 */ 1620 static final int SCROLL_CONTAINER = 0x00080000; 1621 1622 /** 1623 * Set by {@link #setScrollContainer(boolean)}. 1624 */ 1625 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1626 1627 /** 1628 * View flag indicating whether this view was invalidated (fully or partially.) 1629 * 1630 * @hide 1631 */ 1632 static final int DIRTY = 0x00200000; 1633 1634 /** 1635 * View flag indicating whether this view was invalidated by an opaque 1636 * invalidate request. 1637 * 1638 * @hide 1639 */ 1640 static final int DIRTY_OPAQUE = 0x00400000; 1641 1642 /** 1643 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1644 * 1645 * @hide 1646 */ 1647 static final int DIRTY_MASK = 0x00600000; 1648 1649 /** 1650 * Indicates whether the background is opaque. 1651 * 1652 * @hide 1653 */ 1654 static final int OPAQUE_BACKGROUND = 0x00800000; 1655 1656 /** 1657 * Indicates whether the scrollbars are opaque. 1658 * 1659 * @hide 1660 */ 1661 static final int OPAQUE_SCROLLBARS = 0x01000000; 1662 1663 /** 1664 * Indicates whether the view is opaque. 1665 * 1666 * @hide 1667 */ 1668 static final int OPAQUE_MASK = 0x01800000; 1669 1670 /** 1671 * Indicates a prepressed state; 1672 * the short time between ACTION_DOWN and recognizing 1673 * a 'real' press. Prepressed is used to recognize quick taps 1674 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1675 * 1676 * @hide 1677 */ 1678 private static final int PREPRESSED = 0x02000000; 1679 1680 /** 1681 * Indicates whether the view is temporarily detached. 1682 * 1683 * @hide 1684 */ 1685 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1686 1687 /** 1688 * Indicates that we should awaken scroll bars once attached 1689 * 1690 * @hide 1691 */ 1692 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1693 1694 /** 1695 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1696 * @hide 1697 */ 1698 private static final int HOVERED = 0x10000000; 1699 1700 /** 1701 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1702 * for transform operations 1703 * 1704 * @hide 1705 */ 1706 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1707 1708 /** {@hide} */ 1709 static final int ACTIVATED = 0x40000000; 1710 1711 /** 1712 * Indicates that this view was specifically invalidated, not just dirtied because some 1713 * child view was invalidated. The flag is used to determine when we need to recreate 1714 * a view's display list (as opposed to just returning a reference to its existing 1715 * display list). 1716 * 1717 * @hide 1718 */ 1719 static final int INVALIDATED = 0x80000000; 1720 1721 /* Masks for mPrivateFlags2 */ 1722 1723 /** 1724 * Indicates that this view has reported that it can accept the current drag's content. 1725 * Cleared when the drag operation concludes. 1726 * @hide 1727 */ 1728 static final int DRAG_CAN_ACCEPT = 0x00000001; 1729 1730 /** 1731 * Indicates that this view is currently directly under the drag location in a 1732 * drag-and-drop operation involving content that it can accept. Cleared when 1733 * the drag exits the view, or when the drag operation concludes. 1734 * @hide 1735 */ 1736 static final int DRAG_HOVERED = 0x00000002; 1737 1738 /** 1739 * Indicates whether the view layout direction has been resolved and drawn to the 1740 * right-to-left direction. 1741 * 1742 * @hide 1743 */ 1744 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 0x00000004; 1745 1746 /** 1747 * Indicates whether the view layout direction has been resolved. 1748 * 1749 * @hide 1750 */ 1751 static final int LAYOUT_DIRECTION_RESOLVED = 0x00000008; 1752 1753 1754 /* End of masks for mPrivateFlags2 */ 1755 1756 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1757 1758 /** 1759 * Always allow a user to over-scroll this view, provided it is a 1760 * view that can scroll. 1761 * 1762 * @see #getOverScrollMode() 1763 * @see #setOverScrollMode(int) 1764 */ 1765 public static final int OVER_SCROLL_ALWAYS = 0; 1766 1767 /** 1768 * Allow a user to over-scroll this view only if the content is large 1769 * enough to meaningfully scroll, provided it is a view that can scroll. 1770 * 1771 * @see #getOverScrollMode() 1772 * @see #setOverScrollMode(int) 1773 */ 1774 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1775 1776 /** 1777 * Never allow a user to over-scroll this view. 1778 * 1779 * @see #getOverScrollMode() 1780 * @see #setOverScrollMode(int) 1781 */ 1782 public static final int OVER_SCROLL_NEVER = 2; 1783 1784 /** 1785 * View has requested the system UI (status bar) to be visible (the default). 1786 * 1787 * @see #setSystemUiVisibility(int) 1788 */ 1789 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 1790 1791 /** 1792 * View has requested the system UI to enter an unobtrusive "low profile" mode. 1793 * 1794 * This is for use in games, book readers, video players, or any other "immersive" application 1795 * where the usual system chrome is deemed too distracting. 1796 * 1797 * In low profile mode, the status bar and/or navigation icons may dim. 1798 * 1799 * @see #setSystemUiVisibility(int) 1800 */ 1801 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 1802 1803 /** 1804 * View has requested that the system navigation be temporarily hidden. 1805 * 1806 * This is an even less obtrusive state than that called for by 1807 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 1808 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 1809 * those to disappear. This is useful (in conjunction with the 1810 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 1811 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 1812 * window flags) for displaying content using every last pixel on the display. 1813 * 1814 * There is a limitation: because navigation controls are so important, the least user 1815 * interaction will cause them to reappear immediately. 1816 * 1817 * @see #setSystemUiVisibility(int) 1818 */ 1819 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 1820 1821 /** 1822 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 1823 */ 1824 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 1825 1826 /** 1827 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 1828 */ 1829 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 1830 1831 /** 1832 * @hide 1833 * 1834 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1835 * out of the public fields to keep the undefined bits out of the developer's way. 1836 * 1837 * Flag to make the status bar not expandable. Unless you also 1838 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1839 */ 1840 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1841 1842 /** 1843 * @hide 1844 * 1845 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1846 * out of the public fields to keep the undefined bits out of the developer's way. 1847 * 1848 * Flag to hide notification icons and scrolling ticker text. 1849 */ 1850 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1851 1852 /** 1853 * @hide 1854 * 1855 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1856 * out of the public fields to keep the undefined bits out of the developer's way. 1857 * 1858 * Flag to disable incoming notification alerts. This will not block 1859 * icons, but it will block sound, vibrating and other visual or aural notifications. 1860 */ 1861 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1862 1863 /** 1864 * @hide 1865 * 1866 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1867 * out of the public fields to keep the undefined bits out of the developer's way. 1868 * 1869 * Flag to hide only the scrolling ticker. Note that 1870 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1871 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1872 */ 1873 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1874 1875 /** 1876 * @hide 1877 * 1878 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1879 * out of the public fields to keep the undefined bits out of the developer's way. 1880 * 1881 * Flag to hide the center system info area. 1882 */ 1883 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1884 1885 /** 1886 * @hide 1887 * 1888 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1889 * out of the public fields to keep the undefined bits out of the developer's way. 1890 * 1891 * Flag to hide only the navigation buttons. Don't use this 1892 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1893 * 1894 * THIS DOES NOT DISABLE THE BACK BUTTON 1895 */ 1896 public static final int STATUS_BAR_DISABLE_NAVIGATION = 0x00200000; 1897 1898 /** 1899 * @hide 1900 * 1901 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1902 * out of the public fields to keep the undefined bits out of the developer's way. 1903 * 1904 * Flag to hide only the back button. Don't use this 1905 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1906 */ 1907 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1908 1909 /** 1910 * @hide 1911 * 1912 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1913 * out of the public fields to keep the undefined bits out of the developer's way. 1914 * 1915 * Flag to hide only the clock. You might use this if your activity has 1916 * its own clock making the status bar's clock redundant. 1917 */ 1918 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1919 1920 /** 1921 * @hide 1922 */ 1923 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 1924 1925 /** 1926 * Find views that render the specified text. 1927 * 1928 * @see #findViewsWithText(ArrayList, CharSequence, int) 1929 */ 1930 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 1931 1932 /** 1933 * Find find views that contain the specified content description. 1934 * 1935 * @see #findViewsWithText(ArrayList, CharSequence, int) 1936 */ 1937 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 1938 1939 /** 1940 * Controls the over-scroll mode for this view. 1941 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1942 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1943 * and {@link #OVER_SCROLL_NEVER}. 1944 */ 1945 private int mOverScrollMode; 1946 1947 /** 1948 * The parent this view is attached to. 1949 * {@hide} 1950 * 1951 * @see #getParent() 1952 */ 1953 protected ViewParent mParent; 1954 1955 /** 1956 * {@hide} 1957 */ 1958 AttachInfo mAttachInfo; 1959 1960 /** 1961 * {@hide} 1962 */ 1963 @ViewDebug.ExportedProperty(flagMapping = { 1964 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1965 name = "FORCE_LAYOUT"), 1966 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1967 name = "LAYOUT_REQUIRED"), 1968 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1969 name = "DRAWING_CACHE_INVALID", outputIf = false), 1970 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1971 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1972 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1973 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1974 }) 1975 int mPrivateFlags; 1976 int mPrivateFlags2; 1977 1978 /** 1979 * This view's request for the visibility of the status bar. 1980 * @hide 1981 */ 1982 @ViewDebug.ExportedProperty(flagMapping = { 1983 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 1984 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 1985 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 1986 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 1987 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 1988 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 1989 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 1990 equals = SYSTEM_UI_FLAG_VISIBLE, 1991 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 1992 }) 1993 int mSystemUiVisibility; 1994 1995 /** 1996 * Count of how many windows this view has been attached to. 1997 */ 1998 int mWindowAttachCount; 1999 2000 /** 2001 * The layout parameters associated with this view and used by the parent 2002 * {@link android.view.ViewGroup} to determine how this view should be 2003 * laid out. 2004 * {@hide} 2005 */ 2006 protected ViewGroup.LayoutParams mLayoutParams; 2007 2008 /** 2009 * The view flags hold various views states. 2010 * {@hide} 2011 */ 2012 @ViewDebug.ExportedProperty 2013 int mViewFlags; 2014 2015 static class TransformationInfo { 2016 /** 2017 * The transform matrix for the View. This transform is calculated internally 2018 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2019 * is used by default. Do *not* use this variable directly; instead call 2020 * getMatrix(), which will automatically recalculate the matrix if necessary 2021 * to get the correct matrix based on the latest rotation and scale properties. 2022 */ 2023 private final Matrix mMatrix = new Matrix(); 2024 2025 /** 2026 * The transform matrix for the View. This transform is calculated internally 2027 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2028 * is used by default. Do *not* use this variable directly; instead call 2029 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2030 * to get the correct matrix based on the latest rotation and scale properties. 2031 */ 2032 private Matrix mInverseMatrix; 2033 2034 /** 2035 * An internal variable that tracks whether we need to recalculate the 2036 * transform matrix, based on whether the rotation or scaleX/Y properties 2037 * have changed since the matrix was last calculated. 2038 */ 2039 boolean mMatrixDirty = false; 2040 2041 /** 2042 * An internal variable that tracks whether we need to recalculate the 2043 * transform matrix, based on whether the rotation or scaleX/Y properties 2044 * have changed since the matrix was last calculated. 2045 */ 2046 private boolean mInverseMatrixDirty = true; 2047 2048 /** 2049 * A variable that tracks whether we need to recalculate the 2050 * transform matrix, based on whether the rotation or scaleX/Y properties 2051 * have changed since the matrix was last calculated. This variable 2052 * is only valid after a call to updateMatrix() or to a function that 2053 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2054 */ 2055 private boolean mMatrixIsIdentity = true; 2056 2057 /** 2058 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2059 */ 2060 private Camera mCamera = null; 2061 2062 /** 2063 * This matrix is used when computing the matrix for 3D rotations. 2064 */ 2065 private Matrix matrix3D = null; 2066 2067 /** 2068 * These prev values are used to recalculate a centered pivot point when necessary. The 2069 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2070 * set), so thes values are only used then as well. 2071 */ 2072 private int mPrevWidth = -1; 2073 private int mPrevHeight = -1; 2074 2075 /** 2076 * The degrees rotation around the vertical axis through the pivot point. 2077 */ 2078 @ViewDebug.ExportedProperty 2079 float mRotationY = 0f; 2080 2081 /** 2082 * The degrees rotation around the horizontal axis through the pivot point. 2083 */ 2084 @ViewDebug.ExportedProperty 2085 float mRotationX = 0f; 2086 2087 /** 2088 * The degrees rotation around the pivot point. 2089 */ 2090 @ViewDebug.ExportedProperty 2091 float mRotation = 0f; 2092 2093 /** 2094 * The amount of translation of the object away from its left property (post-layout). 2095 */ 2096 @ViewDebug.ExportedProperty 2097 float mTranslationX = 0f; 2098 2099 /** 2100 * The amount of translation of the object away from its top property (post-layout). 2101 */ 2102 @ViewDebug.ExportedProperty 2103 float mTranslationY = 0f; 2104 2105 /** 2106 * The amount of scale in the x direction around the pivot point. A 2107 * value of 1 means no scaling is applied. 2108 */ 2109 @ViewDebug.ExportedProperty 2110 float mScaleX = 1f; 2111 2112 /** 2113 * The amount of scale in the y direction around the pivot point. A 2114 * value of 1 means no scaling is applied. 2115 */ 2116 @ViewDebug.ExportedProperty 2117 float mScaleY = 1f; 2118 2119 /** 2120 * The amount of scale in the x direction around the pivot point. A 2121 * value of 1 means no scaling is applied. 2122 */ 2123 @ViewDebug.ExportedProperty 2124 float mPivotX = 0f; 2125 2126 /** 2127 * The amount of scale in the y direction around the pivot point. A 2128 * value of 1 means no scaling is applied. 2129 */ 2130 @ViewDebug.ExportedProperty 2131 float mPivotY = 0f; 2132 2133 /** 2134 * The opacity of the View. This is a value from 0 to 1, where 0 means 2135 * completely transparent and 1 means completely opaque. 2136 */ 2137 @ViewDebug.ExportedProperty 2138 float mAlpha = 1f; 2139 } 2140 2141 TransformationInfo mTransformationInfo; 2142 2143 private boolean mLastIsOpaque; 2144 2145 /** 2146 * Convenience value to check for float values that are close enough to zero to be considered 2147 * zero. 2148 */ 2149 private static final float NONZERO_EPSILON = .001f; 2150 2151 /** 2152 * The distance in pixels from the left edge of this view's parent 2153 * to the left edge of this view. 2154 * {@hide} 2155 */ 2156 @ViewDebug.ExportedProperty(category = "layout") 2157 protected int mLeft; 2158 /** 2159 * The distance in pixels from the left edge of this view's parent 2160 * to the right edge of this view. 2161 * {@hide} 2162 */ 2163 @ViewDebug.ExportedProperty(category = "layout") 2164 protected int mRight; 2165 /** 2166 * The distance in pixels from the top edge of this view's parent 2167 * to the top edge of this view. 2168 * {@hide} 2169 */ 2170 @ViewDebug.ExportedProperty(category = "layout") 2171 protected int mTop; 2172 /** 2173 * The distance in pixels from the top edge of this view's parent 2174 * to the bottom edge of this view. 2175 * {@hide} 2176 */ 2177 @ViewDebug.ExportedProperty(category = "layout") 2178 protected int mBottom; 2179 2180 /** 2181 * The offset, in pixels, by which the content of this view is scrolled 2182 * horizontally. 2183 * {@hide} 2184 */ 2185 @ViewDebug.ExportedProperty(category = "scrolling") 2186 protected int mScrollX; 2187 /** 2188 * The offset, in pixels, by which the content of this view is scrolled 2189 * vertically. 2190 * {@hide} 2191 */ 2192 @ViewDebug.ExportedProperty(category = "scrolling") 2193 protected int mScrollY; 2194 2195 /** 2196 * The left padding in pixels, that is the distance in pixels between the 2197 * left edge of this view and the left edge of its content. 2198 * {@hide} 2199 */ 2200 @ViewDebug.ExportedProperty(category = "padding") 2201 protected int mPaddingLeft; 2202 /** 2203 * The right padding in pixels, that is the distance in pixels between the 2204 * right edge of this view and the right edge of its content. 2205 * {@hide} 2206 */ 2207 @ViewDebug.ExportedProperty(category = "padding") 2208 protected int mPaddingRight; 2209 /** 2210 * The top padding in pixels, that is the distance in pixels between the 2211 * top edge of this view and the top edge of its content. 2212 * {@hide} 2213 */ 2214 @ViewDebug.ExportedProperty(category = "padding") 2215 protected int mPaddingTop; 2216 /** 2217 * The bottom padding in pixels, that is the distance in pixels between the 2218 * bottom edge of this view and the bottom edge of its content. 2219 * {@hide} 2220 */ 2221 @ViewDebug.ExportedProperty(category = "padding") 2222 protected int mPaddingBottom; 2223 2224 /** 2225 * Briefly describes the view and is primarily used for accessibility support. 2226 */ 2227 private CharSequence mContentDescription; 2228 2229 /** 2230 * Cache the paddingRight set by the user to append to the scrollbar's size. 2231 * 2232 * @hide 2233 */ 2234 @ViewDebug.ExportedProperty(category = "padding") 2235 protected int mUserPaddingRight; 2236 2237 /** 2238 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2239 * 2240 * @hide 2241 */ 2242 @ViewDebug.ExportedProperty(category = "padding") 2243 protected int mUserPaddingBottom; 2244 2245 /** 2246 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2247 * 2248 * @hide 2249 */ 2250 @ViewDebug.ExportedProperty(category = "padding") 2251 protected int mUserPaddingLeft; 2252 2253 /** 2254 * Cache if the user padding is relative. 2255 * 2256 */ 2257 @ViewDebug.ExportedProperty(category = "padding") 2258 boolean mUserPaddingRelative; 2259 2260 /** 2261 * Cache the paddingStart set by the user to append to the scrollbar's size. 2262 * 2263 */ 2264 @ViewDebug.ExportedProperty(category = "padding") 2265 int mUserPaddingStart; 2266 2267 /** 2268 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2269 * 2270 */ 2271 @ViewDebug.ExportedProperty(category = "padding") 2272 int mUserPaddingEnd; 2273 2274 /** 2275 * @hide 2276 */ 2277 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2278 /** 2279 * @hide 2280 */ 2281 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2282 2283 private Drawable mBGDrawable; 2284 2285 private int mBackgroundResource; 2286 private boolean mBackgroundSizeChanged; 2287 2288 /** 2289 * Listener used to dispatch focus change events. 2290 * This field should be made private, so it is hidden from the SDK. 2291 * {@hide} 2292 */ 2293 protected OnFocusChangeListener mOnFocusChangeListener; 2294 2295 /** 2296 * Listeners for layout change events. 2297 */ 2298 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2299 2300 /** 2301 * Listeners for attach events. 2302 */ 2303 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2304 2305 /** 2306 * Listener used to dispatch click events. 2307 * This field should be made private, so it is hidden from the SDK. 2308 * {@hide} 2309 */ 2310 protected OnClickListener mOnClickListener; 2311 2312 /** 2313 * Listener used to dispatch long click events. 2314 * This field should be made private, so it is hidden from the SDK. 2315 * {@hide} 2316 */ 2317 protected OnLongClickListener mOnLongClickListener; 2318 2319 /** 2320 * Listener used to build the context menu. 2321 * This field should be made private, so it is hidden from the SDK. 2322 * {@hide} 2323 */ 2324 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2325 2326 private OnKeyListener mOnKeyListener; 2327 2328 private OnTouchListener mOnTouchListener; 2329 2330 private OnHoverListener mOnHoverListener; 2331 2332 private OnGenericMotionListener mOnGenericMotionListener; 2333 2334 private OnDragListener mOnDragListener; 2335 2336 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2337 2338 /** 2339 * The application environment this view lives in. 2340 * This field should be made private, so it is hidden from the SDK. 2341 * {@hide} 2342 */ 2343 protected Context mContext; 2344 2345 private final Resources mResources; 2346 2347 private ScrollabilityCache mScrollCache; 2348 2349 private int[] mDrawableState = null; 2350 2351 /** 2352 * Set to true when drawing cache is enabled and cannot be created. 2353 * 2354 * @hide 2355 */ 2356 public boolean mCachingFailed; 2357 2358 private Bitmap mDrawingCache; 2359 private Bitmap mUnscaledDrawingCache; 2360 private HardwareLayer mHardwareLayer; 2361 DisplayList mDisplayList; 2362 2363 /** 2364 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2365 * the user may specify which view to go to next. 2366 */ 2367 private int mNextFocusLeftId = View.NO_ID; 2368 2369 /** 2370 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2371 * the user may specify which view to go to next. 2372 */ 2373 private int mNextFocusRightId = View.NO_ID; 2374 2375 /** 2376 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2377 * the user may specify which view to go to next. 2378 */ 2379 private int mNextFocusUpId = View.NO_ID; 2380 2381 /** 2382 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2383 * the user may specify which view to go to next. 2384 */ 2385 private int mNextFocusDownId = View.NO_ID; 2386 2387 /** 2388 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2389 * the user may specify which view to go to next. 2390 */ 2391 int mNextFocusForwardId = View.NO_ID; 2392 2393 private CheckForLongPress mPendingCheckForLongPress; 2394 private CheckForTap mPendingCheckForTap = null; 2395 private PerformClick mPerformClick; 2396 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2397 2398 private UnsetPressedState mUnsetPressedState; 2399 2400 /** 2401 * Whether the long press's action has been invoked. The tap's action is invoked on the 2402 * up event while a long press is invoked as soon as the long press duration is reached, so 2403 * a long press could be performed before the tap is checked, in which case the tap's action 2404 * should not be invoked. 2405 */ 2406 private boolean mHasPerformedLongPress; 2407 2408 /** 2409 * The minimum height of the view. We'll try our best to have the height 2410 * of this view to at least this amount. 2411 */ 2412 @ViewDebug.ExportedProperty(category = "measurement") 2413 private int mMinHeight; 2414 2415 /** 2416 * The minimum width of the view. We'll try our best to have the width 2417 * of this view to at least this amount. 2418 */ 2419 @ViewDebug.ExportedProperty(category = "measurement") 2420 private int mMinWidth; 2421 2422 /** 2423 * The delegate to handle touch events that are physically in this view 2424 * but should be handled by another view. 2425 */ 2426 private TouchDelegate mTouchDelegate = null; 2427 2428 /** 2429 * Solid color to use as a background when creating the drawing cache. Enables 2430 * the cache to use 16 bit bitmaps instead of 32 bit. 2431 */ 2432 private int mDrawingCacheBackgroundColor = 0; 2433 2434 /** 2435 * Special tree observer used when mAttachInfo is null. 2436 */ 2437 private ViewTreeObserver mFloatingTreeObserver; 2438 2439 /** 2440 * Cache the touch slop from the context that created the view. 2441 */ 2442 private int mTouchSlop; 2443 2444 /** 2445 * Object that handles automatic animation of view properties. 2446 */ 2447 private ViewPropertyAnimator mAnimator = null; 2448 2449 /** 2450 * Flag indicating that a drag can cross window boundaries. When 2451 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2452 * with this flag set, all visible applications will be able to participate 2453 * in the drag operation and receive the dragged content. 2454 * 2455 * @hide 2456 */ 2457 public static final int DRAG_FLAG_GLOBAL = 1; 2458 2459 /** 2460 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2461 */ 2462 private float mVerticalScrollFactor; 2463 2464 /** 2465 * Position of the vertical scroll bar. 2466 */ 2467 private int mVerticalScrollbarPosition; 2468 2469 /** 2470 * Position the scroll bar at the default position as determined by the system. 2471 */ 2472 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2473 2474 /** 2475 * Position the scroll bar along the left edge. 2476 */ 2477 public static final int SCROLLBAR_POSITION_LEFT = 1; 2478 2479 /** 2480 * Position the scroll bar along the right edge. 2481 */ 2482 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2483 2484 /** 2485 * Indicates that the view does not have a layer. 2486 * 2487 * @see #getLayerType() 2488 * @see #setLayerType(int, android.graphics.Paint) 2489 * @see #LAYER_TYPE_SOFTWARE 2490 * @see #LAYER_TYPE_HARDWARE 2491 */ 2492 public static final int LAYER_TYPE_NONE = 0; 2493 2494 /** 2495 * <p>Indicates that the view has a software layer. A software layer is backed 2496 * by a bitmap and causes the view to be rendered using Android's software 2497 * rendering pipeline, even if hardware acceleration is enabled.</p> 2498 * 2499 * <p>Software layers have various usages:</p> 2500 * <p>When the application is not using hardware acceleration, a software layer 2501 * is useful to apply a specific color filter and/or blending mode and/or 2502 * translucency to a view and all its children.</p> 2503 * <p>When the application is using hardware acceleration, a software layer 2504 * is useful to render drawing primitives not supported by the hardware 2505 * accelerated pipeline. It can also be used to cache a complex view tree 2506 * into a texture and reduce the complexity of drawing operations. For instance, 2507 * when animating a complex view tree with a translation, a software layer can 2508 * be used to render the view tree only once.</p> 2509 * <p>Software layers should be avoided when the affected view tree updates 2510 * often. Every update will require to re-render the software layer, which can 2511 * potentially be slow (particularly when hardware acceleration is turned on 2512 * since the layer will have to be uploaded into a hardware texture after every 2513 * update.)</p> 2514 * 2515 * @see #getLayerType() 2516 * @see #setLayerType(int, android.graphics.Paint) 2517 * @see #LAYER_TYPE_NONE 2518 * @see #LAYER_TYPE_HARDWARE 2519 */ 2520 public static final int LAYER_TYPE_SOFTWARE = 1; 2521 2522 /** 2523 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2524 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2525 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2526 * rendering pipeline, but only if hardware acceleration is turned on for the 2527 * view hierarchy. When hardware acceleration is turned off, hardware layers 2528 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2529 * 2530 * <p>A hardware layer is useful to apply a specific color filter and/or 2531 * blending mode and/or translucency to a view and all its children.</p> 2532 * <p>A hardware layer can be used to cache a complex view tree into a 2533 * texture and reduce the complexity of drawing operations. For instance, 2534 * when animating a complex view tree with a translation, a hardware layer can 2535 * be used to render the view tree only once.</p> 2536 * <p>A hardware layer can also be used to increase the rendering quality when 2537 * rotation transformations are applied on a view. It can also be used to 2538 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2539 * 2540 * @see #getLayerType() 2541 * @see #setLayerType(int, android.graphics.Paint) 2542 * @see #LAYER_TYPE_NONE 2543 * @see #LAYER_TYPE_SOFTWARE 2544 */ 2545 public static final int LAYER_TYPE_HARDWARE = 2; 2546 2547 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2548 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2549 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2550 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2551 }) 2552 int mLayerType = LAYER_TYPE_NONE; 2553 Paint mLayerPaint; 2554 Rect mLocalDirtyRect; 2555 2556 /** 2557 * Set to true when the view is sending hover accessibility events because it 2558 * is the innermost hovered view. 2559 */ 2560 private boolean mSendingHoverAccessibilityEvents; 2561 2562 /** 2563 * Delegate for injecting accessiblity functionality. 2564 */ 2565 AccessibilityDelegate mAccessibilityDelegate; 2566 2567 /** 2568 * Text direction is inherited thru {@link ViewGroup} 2569 * @hide 2570 */ 2571 public static final int TEXT_DIRECTION_INHERIT = 0; 2572 2573 /** 2574 * Text direction is using "first strong algorithm". The first strong directional character 2575 * determines the paragraph direction. If there is no strong directional character, the 2576 * paragraph direction is the view's resolved ayout direction. 2577 * 2578 * @hide 2579 */ 2580 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 2581 2582 /** 2583 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 2584 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 2585 * If there are neither, the paragraph direction is the view's resolved layout direction. 2586 * 2587 * @hide 2588 */ 2589 public static final int TEXT_DIRECTION_ANY_RTL = 2; 2590 2591 /** 2592 * Text direction is forced to LTR. 2593 * 2594 * @hide 2595 */ 2596 public static final int TEXT_DIRECTION_LTR = 3; 2597 2598 /** 2599 * Text direction is forced to RTL. 2600 * 2601 * @hide 2602 */ 2603 public static final int TEXT_DIRECTION_RTL = 4; 2604 2605 /** 2606 * Default text direction is inherited 2607 * 2608 * @hide 2609 */ 2610 protected static int DEFAULT_TEXT_DIRECTION = TEXT_DIRECTION_INHERIT; 2611 2612 /** 2613 * The text direction that has been defined by {@link #setTextDirection(int)}. 2614 * 2615 * {@hide} 2616 */ 2617 @ViewDebug.ExportedProperty(category = "text", mapping = { 2618 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2619 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2620 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2621 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2622 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL") 2623 }) 2624 private int mTextDirection = DEFAULT_TEXT_DIRECTION; 2625 2626 /** 2627 * The resolved text direction. This needs resolution if the value is 2628 * TEXT_DIRECTION_INHERIT. The resolution matches mTextDirection if that is 2629 * not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds up the parent 2630 * chain of the view. 2631 * 2632 * {@hide} 2633 */ 2634 @ViewDebug.ExportedProperty(category = "text", mapping = { 2635 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2636 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2637 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2638 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2639 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL") 2640 }) 2641 private int mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 2642 2643 /** 2644 * Consistency verifier for debugging purposes. 2645 * @hide 2646 */ 2647 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2648 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2649 new InputEventConsistencyVerifier(this, 0) : null; 2650 2651 /** 2652 * Simple constructor to use when creating a view from code. 2653 * 2654 * @param context The Context the view is running in, through which it can 2655 * access the current theme, resources, etc. 2656 */ 2657 public View(Context context) { 2658 mContext = context; 2659 mResources = context != null ? context.getResources() : null; 2660 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT; 2661 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2662 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2663 mUserPaddingStart = -1; 2664 mUserPaddingEnd = -1; 2665 mUserPaddingRelative = false; 2666 } 2667 2668 /** 2669 * Constructor that is called when inflating a view from XML. This is called 2670 * when a view is being constructed from an XML file, supplying attributes 2671 * that were specified in the XML file. This version uses a default style of 2672 * 0, so the only attribute values applied are those in the Context's Theme 2673 * and the given AttributeSet. 2674 * 2675 * <p> 2676 * The method onFinishInflate() will be called after all children have been 2677 * added. 2678 * 2679 * @param context The Context the view is running in, through which it can 2680 * access the current theme, resources, etc. 2681 * @param attrs The attributes of the XML tag that is inflating the view. 2682 * @see #View(Context, AttributeSet, int) 2683 */ 2684 public View(Context context, AttributeSet attrs) { 2685 this(context, attrs, 0); 2686 } 2687 2688 /** 2689 * Perform inflation from XML and apply a class-specific base style. This 2690 * constructor of View allows subclasses to use their own base style when 2691 * they are inflating. For example, a Button class's constructor would call 2692 * this version of the super class constructor and supply 2693 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2694 * the theme's button style to modify all of the base view attributes (in 2695 * particular its background) as well as the Button class's attributes. 2696 * 2697 * @param context The Context the view is running in, through which it can 2698 * access the current theme, resources, etc. 2699 * @param attrs The attributes of the XML tag that is inflating the view. 2700 * @param defStyle The default style to apply to this view. If 0, no style 2701 * will be applied (beyond what is included in the theme). This may 2702 * either be an attribute resource, whose value will be retrieved 2703 * from the current theme, or an explicit style resource. 2704 * @see #View(Context, AttributeSet) 2705 */ 2706 public View(Context context, AttributeSet attrs, int defStyle) { 2707 this(context); 2708 2709 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2710 defStyle, 0); 2711 2712 Drawable background = null; 2713 2714 int leftPadding = -1; 2715 int topPadding = -1; 2716 int rightPadding = -1; 2717 int bottomPadding = -1; 2718 int startPadding = -1; 2719 int endPadding = -1; 2720 2721 int padding = -1; 2722 2723 int viewFlagValues = 0; 2724 int viewFlagMasks = 0; 2725 2726 boolean setScrollContainer = false; 2727 2728 int x = 0; 2729 int y = 0; 2730 2731 float tx = 0; 2732 float ty = 0; 2733 float rotation = 0; 2734 float rotationX = 0; 2735 float rotationY = 0; 2736 float sx = 1f; 2737 float sy = 1f; 2738 boolean transformSet = false; 2739 2740 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2741 2742 int overScrollMode = mOverScrollMode; 2743 final int N = a.getIndexCount(); 2744 for (int i = 0; i < N; i++) { 2745 int attr = a.getIndex(i); 2746 switch (attr) { 2747 case com.android.internal.R.styleable.View_background: 2748 background = a.getDrawable(attr); 2749 break; 2750 case com.android.internal.R.styleable.View_padding: 2751 padding = a.getDimensionPixelSize(attr, -1); 2752 break; 2753 case com.android.internal.R.styleable.View_paddingLeft: 2754 leftPadding = a.getDimensionPixelSize(attr, -1); 2755 break; 2756 case com.android.internal.R.styleable.View_paddingTop: 2757 topPadding = a.getDimensionPixelSize(attr, -1); 2758 break; 2759 case com.android.internal.R.styleable.View_paddingRight: 2760 rightPadding = a.getDimensionPixelSize(attr, -1); 2761 break; 2762 case com.android.internal.R.styleable.View_paddingBottom: 2763 bottomPadding = a.getDimensionPixelSize(attr, -1); 2764 break; 2765 case com.android.internal.R.styleable.View_paddingStart: 2766 startPadding = a.getDimensionPixelSize(attr, -1); 2767 break; 2768 case com.android.internal.R.styleable.View_paddingEnd: 2769 endPadding = a.getDimensionPixelSize(attr, -1); 2770 break; 2771 case com.android.internal.R.styleable.View_scrollX: 2772 x = a.getDimensionPixelOffset(attr, 0); 2773 break; 2774 case com.android.internal.R.styleable.View_scrollY: 2775 y = a.getDimensionPixelOffset(attr, 0); 2776 break; 2777 case com.android.internal.R.styleable.View_alpha: 2778 setAlpha(a.getFloat(attr, 1f)); 2779 break; 2780 case com.android.internal.R.styleable.View_transformPivotX: 2781 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2782 break; 2783 case com.android.internal.R.styleable.View_transformPivotY: 2784 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2785 break; 2786 case com.android.internal.R.styleable.View_translationX: 2787 tx = a.getDimensionPixelOffset(attr, 0); 2788 transformSet = true; 2789 break; 2790 case com.android.internal.R.styleable.View_translationY: 2791 ty = a.getDimensionPixelOffset(attr, 0); 2792 transformSet = true; 2793 break; 2794 case com.android.internal.R.styleable.View_rotation: 2795 rotation = a.getFloat(attr, 0); 2796 transformSet = true; 2797 break; 2798 case com.android.internal.R.styleable.View_rotationX: 2799 rotationX = a.getFloat(attr, 0); 2800 transformSet = true; 2801 break; 2802 case com.android.internal.R.styleable.View_rotationY: 2803 rotationY = a.getFloat(attr, 0); 2804 transformSet = true; 2805 break; 2806 case com.android.internal.R.styleable.View_scaleX: 2807 sx = a.getFloat(attr, 1f); 2808 transformSet = true; 2809 break; 2810 case com.android.internal.R.styleable.View_scaleY: 2811 sy = a.getFloat(attr, 1f); 2812 transformSet = true; 2813 break; 2814 case com.android.internal.R.styleable.View_id: 2815 mID = a.getResourceId(attr, NO_ID); 2816 break; 2817 case com.android.internal.R.styleable.View_tag: 2818 mTag = a.getText(attr); 2819 break; 2820 case com.android.internal.R.styleable.View_fitsSystemWindows: 2821 if (a.getBoolean(attr, false)) { 2822 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2823 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2824 } 2825 break; 2826 case com.android.internal.R.styleable.View_focusable: 2827 if (a.getBoolean(attr, false)) { 2828 viewFlagValues |= FOCUSABLE; 2829 viewFlagMasks |= FOCUSABLE_MASK; 2830 } 2831 break; 2832 case com.android.internal.R.styleable.View_focusableInTouchMode: 2833 if (a.getBoolean(attr, false)) { 2834 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2835 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2836 } 2837 break; 2838 case com.android.internal.R.styleable.View_clickable: 2839 if (a.getBoolean(attr, false)) { 2840 viewFlagValues |= CLICKABLE; 2841 viewFlagMasks |= CLICKABLE; 2842 } 2843 break; 2844 case com.android.internal.R.styleable.View_longClickable: 2845 if (a.getBoolean(attr, false)) { 2846 viewFlagValues |= LONG_CLICKABLE; 2847 viewFlagMasks |= LONG_CLICKABLE; 2848 } 2849 break; 2850 case com.android.internal.R.styleable.View_saveEnabled: 2851 if (!a.getBoolean(attr, true)) { 2852 viewFlagValues |= SAVE_DISABLED; 2853 viewFlagMasks |= SAVE_DISABLED_MASK; 2854 } 2855 break; 2856 case com.android.internal.R.styleable.View_duplicateParentState: 2857 if (a.getBoolean(attr, false)) { 2858 viewFlagValues |= DUPLICATE_PARENT_STATE; 2859 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2860 } 2861 break; 2862 case com.android.internal.R.styleable.View_visibility: 2863 final int visibility = a.getInt(attr, 0); 2864 if (visibility != 0) { 2865 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2866 viewFlagMasks |= VISIBILITY_MASK; 2867 } 2868 break; 2869 case com.android.internal.R.styleable.View_layoutDirection: 2870 // Clear any HORIZONTAL_DIRECTION flag already set 2871 viewFlagValues &= ~LAYOUT_DIRECTION_MASK; 2872 // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute 2873 final int layoutDirection = a.getInt(attr, -1); 2874 if (layoutDirection != -1) { 2875 viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection]; 2876 } else { 2877 // Set to default (LAYOUT_DIRECTION_INHERIT) 2878 viewFlagValues |= LAYOUT_DIRECTION_DEFAULT; 2879 } 2880 viewFlagMasks |= LAYOUT_DIRECTION_MASK; 2881 break; 2882 case com.android.internal.R.styleable.View_drawingCacheQuality: 2883 final int cacheQuality = a.getInt(attr, 0); 2884 if (cacheQuality != 0) { 2885 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2886 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2887 } 2888 break; 2889 case com.android.internal.R.styleable.View_contentDescription: 2890 mContentDescription = a.getString(attr); 2891 break; 2892 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2893 if (!a.getBoolean(attr, true)) { 2894 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2895 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2896 } 2897 break; 2898 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2899 if (!a.getBoolean(attr, true)) { 2900 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2901 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2902 } 2903 break; 2904 case R.styleable.View_scrollbars: 2905 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2906 if (scrollbars != SCROLLBARS_NONE) { 2907 viewFlagValues |= scrollbars; 2908 viewFlagMasks |= SCROLLBARS_MASK; 2909 initializeScrollbars(a); 2910 } 2911 break; 2912 //noinspection deprecation 2913 case R.styleable.View_fadingEdge: 2914 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 2915 // Ignore the attribute starting with ICS 2916 break; 2917 } 2918 // With builds < ICS, fall through and apply fading edges 2919 case R.styleable.View_requiresFadingEdge: 2920 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2921 if (fadingEdge != FADING_EDGE_NONE) { 2922 viewFlagValues |= fadingEdge; 2923 viewFlagMasks |= FADING_EDGE_MASK; 2924 initializeFadingEdge(a); 2925 } 2926 break; 2927 case R.styleable.View_scrollbarStyle: 2928 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2929 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2930 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2931 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2932 } 2933 break; 2934 case R.styleable.View_isScrollContainer: 2935 setScrollContainer = true; 2936 if (a.getBoolean(attr, false)) { 2937 setScrollContainer(true); 2938 } 2939 break; 2940 case com.android.internal.R.styleable.View_keepScreenOn: 2941 if (a.getBoolean(attr, false)) { 2942 viewFlagValues |= KEEP_SCREEN_ON; 2943 viewFlagMasks |= KEEP_SCREEN_ON; 2944 } 2945 break; 2946 case R.styleable.View_filterTouchesWhenObscured: 2947 if (a.getBoolean(attr, false)) { 2948 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2949 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2950 } 2951 break; 2952 case R.styleable.View_nextFocusLeft: 2953 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2954 break; 2955 case R.styleable.View_nextFocusRight: 2956 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2957 break; 2958 case R.styleable.View_nextFocusUp: 2959 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2960 break; 2961 case R.styleable.View_nextFocusDown: 2962 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2963 break; 2964 case R.styleable.View_nextFocusForward: 2965 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2966 break; 2967 case R.styleable.View_minWidth: 2968 mMinWidth = a.getDimensionPixelSize(attr, 0); 2969 break; 2970 case R.styleable.View_minHeight: 2971 mMinHeight = a.getDimensionPixelSize(attr, 0); 2972 break; 2973 case R.styleable.View_onClick: 2974 if (context.isRestricted()) { 2975 throw new IllegalStateException("The android:onClick attribute cannot " 2976 + "be used within a restricted context"); 2977 } 2978 2979 final String handlerName = a.getString(attr); 2980 if (handlerName != null) { 2981 setOnClickListener(new OnClickListener() { 2982 private Method mHandler; 2983 2984 public void onClick(View v) { 2985 if (mHandler == null) { 2986 try { 2987 mHandler = getContext().getClass().getMethod(handlerName, 2988 View.class); 2989 } catch (NoSuchMethodException e) { 2990 int id = getId(); 2991 String idText = id == NO_ID ? "" : " with id '" 2992 + getContext().getResources().getResourceEntryName( 2993 id) + "'"; 2994 throw new IllegalStateException("Could not find a method " + 2995 handlerName + "(View) in the activity " 2996 + getContext().getClass() + " for onClick handler" 2997 + " on view " + View.this.getClass() + idText, e); 2998 } 2999 } 3000 3001 try { 3002 mHandler.invoke(getContext(), View.this); 3003 } catch (IllegalAccessException e) { 3004 throw new IllegalStateException("Could not execute non " 3005 + "public method of the activity", e); 3006 } catch (InvocationTargetException e) { 3007 throw new IllegalStateException("Could not execute " 3008 + "method of the activity", e); 3009 } 3010 } 3011 }); 3012 } 3013 break; 3014 case R.styleable.View_overScrollMode: 3015 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3016 break; 3017 case R.styleable.View_verticalScrollbarPosition: 3018 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3019 break; 3020 case R.styleable.View_layerType: 3021 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3022 break; 3023 case R.styleable.View_textDirection: 3024 mTextDirection = a.getInt(attr, DEFAULT_TEXT_DIRECTION); 3025 break; 3026 } 3027 } 3028 3029 a.recycle(); 3030 3031 setOverScrollMode(overScrollMode); 3032 3033 if (background != null) { 3034 setBackgroundDrawable(background); 3035 } 3036 3037 mUserPaddingRelative = (startPadding >= 0 || endPadding >= 0); 3038 3039 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3040 // layout direction). Those cached values will be used later during padding resolution. 3041 mUserPaddingStart = startPadding; 3042 mUserPaddingEnd = endPadding; 3043 3044 if (padding >= 0) { 3045 leftPadding = padding; 3046 topPadding = padding; 3047 rightPadding = padding; 3048 bottomPadding = padding; 3049 } 3050 3051 // If the user specified the padding (either with android:padding or 3052 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3053 // use the default padding or the padding from the background drawable 3054 // (stored at this point in mPadding*) 3055 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3056 topPadding >= 0 ? topPadding : mPaddingTop, 3057 rightPadding >= 0 ? rightPadding : mPaddingRight, 3058 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3059 3060 if (viewFlagMasks != 0) { 3061 setFlags(viewFlagValues, viewFlagMasks); 3062 } 3063 3064 // Needs to be called after mViewFlags is set 3065 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3066 recomputePadding(); 3067 } 3068 3069 if (x != 0 || y != 0) { 3070 scrollTo(x, y); 3071 } 3072 3073 if (transformSet) { 3074 setTranslationX(tx); 3075 setTranslationY(ty); 3076 setRotation(rotation); 3077 setRotationX(rotationX); 3078 setRotationY(rotationY); 3079 setScaleX(sx); 3080 setScaleY(sy); 3081 } 3082 3083 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3084 setScrollContainer(true); 3085 } 3086 3087 computeOpaqueFlags(); 3088 } 3089 3090 /** 3091 * Non-public constructor for use in testing 3092 */ 3093 View() { 3094 mResources = null; 3095 } 3096 3097 /** 3098 * <p> 3099 * Initializes the fading edges from a given set of styled attributes. This 3100 * method should be called by subclasses that need fading edges and when an 3101 * instance of these subclasses is created programmatically rather than 3102 * being inflated from XML. This method is automatically called when the XML 3103 * is inflated. 3104 * </p> 3105 * 3106 * @param a the styled attributes set to initialize the fading edges from 3107 */ 3108 protected void initializeFadingEdge(TypedArray a) { 3109 initScrollCache(); 3110 3111 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3112 R.styleable.View_fadingEdgeLength, 3113 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3114 } 3115 3116 /** 3117 * Returns the size of the vertical faded edges used to indicate that more 3118 * content in this view is visible. 3119 * 3120 * @return The size in pixels of the vertical faded edge or 0 if vertical 3121 * faded edges are not enabled for this view. 3122 * @attr ref android.R.styleable#View_fadingEdgeLength 3123 */ 3124 public int getVerticalFadingEdgeLength() { 3125 if (isVerticalFadingEdgeEnabled()) { 3126 ScrollabilityCache cache = mScrollCache; 3127 if (cache != null) { 3128 return cache.fadingEdgeLength; 3129 } 3130 } 3131 return 0; 3132 } 3133 3134 /** 3135 * Set the size of the faded edge used to indicate that more content in this 3136 * view is available. Will not change whether the fading edge is enabled; use 3137 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3138 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3139 * for the vertical or horizontal fading edges. 3140 * 3141 * @param length The size in pixels of the faded edge used to indicate that more 3142 * content in this view is visible. 3143 */ 3144 public void setFadingEdgeLength(int length) { 3145 initScrollCache(); 3146 mScrollCache.fadingEdgeLength = length; 3147 } 3148 3149 /** 3150 * Returns the size of the horizontal faded edges used to indicate that more 3151 * content in this view is visible. 3152 * 3153 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3154 * faded edges are not enabled for this view. 3155 * @attr ref android.R.styleable#View_fadingEdgeLength 3156 */ 3157 public int getHorizontalFadingEdgeLength() { 3158 if (isHorizontalFadingEdgeEnabled()) { 3159 ScrollabilityCache cache = mScrollCache; 3160 if (cache != null) { 3161 return cache.fadingEdgeLength; 3162 } 3163 } 3164 return 0; 3165 } 3166 3167 /** 3168 * Returns the width of the vertical scrollbar. 3169 * 3170 * @return The width in pixels of the vertical scrollbar or 0 if there 3171 * is no vertical scrollbar. 3172 */ 3173 public int getVerticalScrollbarWidth() { 3174 ScrollabilityCache cache = mScrollCache; 3175 if (cache != null) { 3176 ScrollBarDrawable scrollBar = cache.scrollBar; 3177 if (scrollBar != null) { 3178 int size = scrollBar.getSize(true); 3179 if (size <= 0) { 3180 size = cache.scrollBarSize; 3181 } 3182 return size; 3183 } 3184 return 0; 3185 } 3186 return 0; 3187 } 3188 3189 /** 3190 * Returns the height of the horizontal scrollbar. 3191 * 3192 * @return The height in pixels of the horizontal scrollbar or 0 if 3193 * there is no horizontal scrollbar. 3194 */ 3195 protected int getHorizontalScrollbarHeight() { 3196 ScrollabilityCache cache = mScrollCache; 3197 if (cache != null) { 3198 ScrollBarDrawable scrollBar = cache.scrollBar; 3199 if (scrollBar != null) { 3200 int size = scrollBar.getSize(false); 3201 if (size <= 0) { 3202 size = cache.scrollBarSize; 3203 } 3204 return size; 3205 } 3206 return 0; 3207 } 3208 return 0; 3209 } 3210 3211 /** 3212 * <p> 3213 * Initializes the scrollbars from a given set of styled attributes. This 3214 * method should be called by subclasses that need scrollbars and when an 3215 * instance of these subclasses is created programmatically rather than 3216 * being inflated from XML. This method is automatically called when the XML 3217 * is inflated. 3218 * </p> 3219 * 3220 * @param a the styled attributes set to initialize the scrollbars from 3221 */ 3222 protected void initializeScrollbars(TypedArray a) { 3223 initScrollCache(); 3224 3225 final ScrollabilityCache scrollabilityCache = mScrollCache; 3226 3227 if (scrollabilityCache.scrollBar == null) { 3228 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3229 } 3230 3231 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3232 3233 if (!fadeScrollbars) { 3234 scrollabilityCache.state = ScrollabilityCache.ON; 3235 } 3236 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3237 3238 3239 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3240 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3241 .getScrollBarFadeDuration()); 3242 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3243 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3244 ViewConfiguration.getScrollDefaultDelay()); 3245 3246 3247 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3248 com.android.internal.R.styleable.View_scrollbarSize, 3249 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3250 3251 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3252 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3253 3254 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3255 if (thumb != null) { 3256 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3257 } 3258 3259 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3260 false); 3261 if (alwaysDraw) { 3262 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3263 } 3264 3265 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3266 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3267 3268 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3269 if (thumb != null) { 3270 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3271 } 3272 3273 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3274 false); 3275 if (alwaysDraw) { 3276 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3277 } 3278 3279 // Re-apply user/background padding so that scrollbar(s) get added 3280 resolvePadding(); 3281 } 3282 3283 /** 3284 * <p> 3285 * Initalizes the scrollability cache if necessary. 3286 * </p> 3287 */ 3288 private void initScrollCache() { 3289 if (mScrollCache == null) { 3290 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3291 } 3292 } 3293 3294 /** 3295 * Set the position of the vertical scroll bar. Should be one of 3296 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3297 * {@link #SCROLLBAR_POSITION_RIGHT}. 3298 * 3299 * @param position Where the vertical scroll bar should be positioned. 3300 */ 3301 public void setVerticalScrollbarPosition(int position) { 3302 if (mVerticalScrollbarPosition != position) { 3303 mVerticalScrollbarPosition = position; 3304 computeOpaqueFlags(); 3305 resolvePadding(); 3306 } 3307 } 3308 3309 /** 3310 * @return The position where the vertical scroll bar will show, if applicable. 3311 * @see #setVerticalScrollbarPosition(int) 3312 */ 3313 public int getVerticalScrollbarPosition() { 3314 return mVerticalScrollbarPosition; 3315 } 3316 3317 /** 3318 * Register a callback to be invoked when focus of this view changed. 3319 * 3320 * @param l The callback that will run. 3321 */ 3322 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3323 mOnFocusChangeListener = l; 3324 } 3325 3326 /** 3327 * Add a listener that will be called when the bounds of the view change due to 3328 * layout processing. 3329 * 3330 * @param listener The listener that will be called when layout bounds change. 3331 */ 3332 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3333 if (mOnLayoutChangeListeners == null) { 3334 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3335 } 3336 mOnLayoutChangeListeners.add(listener); 3337 } 3338 3339 /** 3340 * Remove a listener for layout changes. 3341 * 3342 * @param listener The listener for layout bounds change. 3343 */ 3344 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3345 if (mOnLayoutChangeListeners == null) { 3346 return; 3347 } 3348 mOnLayoutChangeListeners.remove(listener); 3349 } 3350 3351 /** 3352 * Add a listener for attach state changes. 3353 * 3354 * This listener will be called whenever this view is attached or detached 3355 * from a window. Remove the listener using 3356 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3357 * 3358 * @param listener Listener to attach 3359 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3360 */ 3361 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3362 if (mOnAttachStateChangeListeners == null) { 3363 mOnAttachStateChangeListeners = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3364 } 3365 mOnAttachStateChangeListeners.add(listener); 3366 } 3367 3368 /** 3369 * Remove a listener for attach state changes. The listener will receive no further 3370 * notification of window attach/detach events. 3371 * 3372 * @param listener Listener to remove 3373 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3374 */ 3375 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3376 if (mOnAttachStateChangeListeners == null) { 3377 return; 3378 } 3379 mOnAttachStateChangeListeners.remove(listener); 3380 } 3381 3382 /** 3383 * Returns the focus-change callback registered for this view. 3384 * 3385 * @return The callback, or null if one is not registered. 3386 */ 3387 public OnFocusChangeListener getOnFocusChangeListener() { 3388 return mOnFocusChangeListener; 3389 } 3390 3391 /** 3392 * Register a callback to be invoked when this view is clicked. If this view is not 3393 * clickable, it becomes clickable. 3394 * 3395 * @param l The callback that will run 3396 * 3397 * @see #setClickable(boolean) 3398 */ 3399 public void setOnClickListener(OnClickListener l) { 3400 if (!isClickable()) { 3401 setClickable(true); 3402 } 3403 mOnClickListener = l; 3404 } 3405 3406 /** 3407 * Register a callback to be invoked when this view is clicked and held. If this view is not 3408 * long clickable, it becomes long clickable. 3409 * 3410 * @param l The callback that will run 3411 * 3412 * @see #setLongClickable(boolean) 3413 */ 3414 public void setOnLongClickListener(OnLongClickListener l) { 3415 if (!isLongClickable()) { 3416 setLongClickable(true); 3417 } 3418 mOnLongClickListener = l; 3419 } 3420 3421 /** 3422 * Register a callback to be invoked when the context menu for this view is 3423 * being built. If this view is not long clickable, it becomes long clickable. 3424 * 3425 * @param l The callback that will run 3426 * 3427 */ 3428 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3429 if (!isLongClickable()) { 3430 setLongClickable(true); 3431 } 3432 mOnCreateContextMenuListener = l; 3433 } 3434 3435 /** 3436 * Call this view's OnClickListener, if it is defined. 3437 * 3438 * @return True there was an assigned OnClickListener that was called, false 3439 * otherwise is returned. 3440 */ 3441 public boolean performClick() { 3442 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3443 3444 if (mOnClickListener != null) { 3445 playSoundEffect(SoundEffectConstants.CLICK); 3446 mOnClickListener.onClick(this); 3447 return true; 3448 } 3449 3450 return false; 3451 } 3452 3453 /** 3454 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3455 * OnLongClickListener did not consume the event. 3456 * 3457 * @return True if one of the above receivers consumed the event, false otherwise. 3458 */ 3459 public boolean performLongClick() { 3460 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3461 3462 boolean handled = false; 3463 if (mOnLongClickListener != null) { 3464 handled = mOnLongClickListener.onLongClick(View.this); 3465 } 3466 if (!handled) { 3467 handled = showContextMenu(); 3468 } 3469 if (handled) { 3470 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3471 } 3472 return handled; 3473 } 3474 3475 /** 3476 * Performs button-related actions during a touch down event. 3477 * 3478 * @param event The event. 3479 * @return True if the down was consumed. 3480 * 3481 * @hide 3482 */ 3483 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3484 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3485 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3486 return true; 3487 } 3488 } 3489 return false; 3490 } 3491 3492 /** 3493 * Bring up the context menu for this view. 3494 * 3495 * @return Whether a context menu was displayed. 3496 */ 3497 public boolean showContextMenu() { 3498 return getParent().showContextMenuForChild(this); 3499 } 3500 3501 /** 3502 * Bring up the context menu for this view, referring to the item under the specified point. 3503 * 3504 * @param x The referenced x coordinate. 3505 * @param y The referenced y coordinate. 3506 * @param metaState The keyboard modifiers that were pressed. 3507 * @return Whether a context menu was displayed. 3508 * 3509 * @hide 3510 */ 3511 public boolean showContextMenu(float x, float y, int metaState) { 3512 return showContextMenu(); 3513 } 3514 3515 /** 3516 * Start an action mode. 3517 * 3518 * @param callback Callback that will control the lifecycle of the action mode 3519 * @return The new action mode if it is started, null otherwise 3520 * 3521 * @see ActionMode 3522 */ 3523 public ActionMode startActionMode(ActionMode.Callback callback) { 3524 return getParent().startActionModeForChild(this, callback); 3525 } 3526 3527 /** 3528 * Register a callback to be invoked when a key is pressed in this view. 3529 * @param l the key listener to attach to this view 3530 */ 3531 public void setOnKeyListener(OnKeyListener l) { 3532 mOnKeyListener = l; 3533 } 3534 3535 /** 3536 * Register a callback to be invoked when a touch event is sent to this view. 3537 * @param l the touch listener to attach to this view 3538 */ 3539 public void setOnTouchListener(OnTouchListener l) { 3540 mOnTouchListener = l; 3541 } 3542 3543 /** 3544 * Register a callback to be invoked when a generic motion event is sent to this view. 3545 * @param l the generic motion listener to attach to this view 3546 */ 3547 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3548 mOnGenericMotionListener = l; 3549 } 3550 3551 /** 3552 * Register a callback to be invoked when a hover event is sent to this view. 3553 * @param l the hover listener to attach to this view 3554 */ 3555 public void setOnHoverListener(OnHoverListener l) { 3556 mOnHoverListener = l; 3557 } 3558 3559 /** 3560 * Register a drag event listener callback object for this View. The parameter is 3561 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3562 * View, the system calls the 3563 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3564 * @param l An implementation of {@link android.view.View.OnDragListener}. 3565 */ 3566 public void setOnDragListener(OnDragListener l) { 3567 mOnDragListener = l; 3568 } 3569 3570 /** 3571 * Give this view focus. This will cause 3572 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3573 * 3574 * Note: this does not check whether this {@link View} should get focus, it just 3575 * gives it focus no matter what. It should only be called internally by framework 3576 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3577 * 3578 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3579 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3580 * focus moved when requestFocus() is called. It may not always 3581 * apply, in which case use the default View.FOCUS_DOWN. 3582 * @param previouslyFocusedRect The rectangle of the view that had focus 3583 * prior in this View's coordinate system. 3584 */ 3585 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3586 if (DBG) { 3587 System.out.println(this + " requestFocus()"); 3588 } 3589 3590 if ((mPrivateFlags & FOCUSED) == 0) { 3591 mPrivateFlags |= FOCUSED; 3592 3593 if (mParent != null) { 3594 mParent.requestChildFocus(this, this); 3595 } 3596 3597 onFocusChanged(true, direction, previouslyFocusedRect); 3598 refreshDrawableState(); 3599 } 3600 } 3601 3602 /** 3603 * Request that a rectangle of this view be visible on the screen, 3604 * scrolling if necessary just enough. 3605 * 3606 * <p>A View should call this if it maintains some notion of which part 3607 * of its content is interesting. For example, a text editing view 3608 * should call this when its cursor moves. 3609 * 3610 * @param rectangle The rectangle. 3611 * @return Whether any parent scrolled. 3612 */ 3613 public boolean requestRectangleOnScreen(Rect rectangle) { 3614 return requestRectangleOnScreen(rectangle, false); 3615 } 3616 3617 /** 3618 * Request that a rectangle of this view be visible on the screen, 3619 * scrolling if necessary just enough. 3620 * 3621 * <p>A View should call this if it maintains some notion of which part 3622 * of its content is interesting. For example, a text editing view 3623 * should call this when its cursor moves. 3624 * 3625 * <p>When <code>immediate</code> is set to true, scrolling will not be 3626 * animated. 3627 * 3628 * @param rectangle The rectangle. 3629 * @param immediate True to forbid animated scrolling, false otherwise 3630 * @return Whether any parent scrolled. 3631 */ 3632 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3633 View child = this; 3634 ViewParent parent = mParent; 3635 boolean scrolled = false; 3636 while (parent != null) { 3637 scrolled |= parent.requestChildRectangleOnScreen(child, 3638 rectangle, immediate); 3639 3640 // offset rect so next call has the rectangle in the 3641 // coordinate system of its direct child. 3642 rectangle.offset(child.getLeft(), child.getTop()); 3643 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3644 3645 if (!(parent instanceof View)) { 3646 break; 3647 } 3648 3649 child = (View) parent; 3650 parent = child.getParent(); 3651 } 3652 return scrolled; 3653 } 3654 3655 /** 3656 * Called when this view wants to give up focus. This will cause 3657 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3658 */ 3659 public void clearFocus() { 3660 if (DBG) { 3661 System.out.println(this + " clearFocus()"); 3662 } 3663 3664 if ((mPrivateFlags & FOCUSED) != 0) { 3665 mPrivateFlags &= ~FOCUSED; 3666 3667 if (mParent != null) { 3668 mParent.clearChildFocus(this); 3669 } 3670 3671 onFocusChanged(false, 0, null); 3672 refreshDrawableState(); 3673 } 3674 } 3675 3676 /** 3677 * Called to clear the focus of a view that is about to be removed. 3678 * Doesn't call clearChildFocus, which prevents this view from taking 3679 * focus again before it has been removed from the parent 3680 */ 3681 void clearFocusForRemoval() { 3682 if ((mPrivateFlags & FOCUSED) != 0) { 3683 mPrivateFlags &= ~FOCUSED; 3684 3685 onFocusChanged(false, 0, null); 3686 refreshDrawableState(); 3687 } 3688 } 3689 3690 /** 3691 * Called internally by the view system when a new view is getting focus. 3692 * This is what clears the old focus. 3693 */ 3694 void unFocus() { 3695 if (DBG) { 3696 System.out.println(this + " unFocus()"); 3697 } 3698 3699 if ((mPrivateFlags & FOCUSED) != 0) { 3700 mPrivateFlags &= ~FOCUSED; 3701 3702 onFocusChanged(false, 0, null); 3703 refreshDrawableState(); 3704 } 3705 } 3706 3707 /** 3708 * Returns true if this view has focus iteself, or is the ancestor of the 3709 * view that has focus. 3710 * 3711 * @return True if this view has or contains focus, false otherwise. 3712 */ 3713 @ViewDebug.ExportedProperty(category = "focus") 3714 public boolean hasFocus() { 3715 return (mPrivateFlags & FOCUSED) != 0; 3716 } 3717 3718 /** 3719 * Returns true if this view is focusable or if it contains a reachable View 3720 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3721 * is a View whose parents do not block descendants focus. 3722 * 3723 * Only {@link #VISIBLE} views are considered focusable. 3724 * 3725 * @return True if the view is focusable or if the view contains a focusable 3726 * View, false otherwise. 3727 * 3728 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3729 */ 3730 public boolean hasFocusable() { 3731 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3732 } 3733 3734 /** 3735 * Called by the view system when the focus state of this view changes. 3736 * When the focus change event is caused by directional navigation, direction 3737 * and previouslyFocusedRect provide insight into where the focus is coming from. 3738 * When overriding, be sure to call up through to the super class so that 3739 * the standard focus handling will occur. 3740 * 3741 * @param gainFocus True if the View has focus; false otherwise. 3742 * @param direction The direction focus has moved when requestFocus() 3743 * is called to give this view focus. Values are 3744 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3745 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3746 * It may not always apply, in which case use the default. 3747 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3748 * system, of the previously focused view. If applicable, this will be 3749 * passed in as finer grained information about where the focus is coming 3750 * from (in addition to direction). Will be <code>null</code> otherwise. 3751 */ 3752 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3753 if (gainFocus) { 3754 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3755 } 3756 3757 InputMethodManager imm = InputMethodManager.peekInstance(); 3758 if (!gainFocus) { 3759 if (isPressed()) { 3760 setPressed(false); 3761 } 3762 if (imm != null && mAttachInfo != null 3763 && mAttachInfo.mHasWindowFocus) { 3764 imm.focusOut(this); 3765 } 3766 onFocusLost(); 3767 } else if (imm != null && mAttachInfo != null 3768 && mAttachInfo.mHasWindowFocus) { 3769 imm.focusIn(this); 3770 } 3771 3772 invalidate(true); 3773 if (mOnFocusChangeListener != null) { 3774 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3775 } 3776 3777 if (mAttachInfo != null) { 3778 mAttachInfo.mKeyDispatchState.reset(this); 3779 } 3780 } 3781 3782 /** 3783 * Sends an accessibility event of the given type. If accessiiblity is 3784 * not enabled this method has no effect. The default implementation calls 3785 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3786 * to populate information about the event source (this View), then calls 3787 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3788 * populate the text content of the event source including its descendants, 3789 * and last calls 3790 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3791 * on its parent to resuest sending of the event to interested parties. 3792 * <p> 3793 * If an {@link AccessibilityDelegate} has been specified via calling 3794 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3795 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 3796 * responsible for handling this call. 3797 * </p> 3798 * 3799 * @param eventType The type of the event to send. 3800 * 3801 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3802 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3803 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3804 * @see AccessibilityDelegate 3805 */ 3806 public void sendAccessibilityEvent(int eventType) { 3807 if (mAccessibilityDelegate != null) { 3808 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 3809 } else { 3810 sendAccessibilityEventInternal(eventType); 3811 } 3812 } 3813 3814 /** 3815 * @see #sendAccessibilityEvent(int) 3816 * 3817 * Note: Called from the default {@link AccessibilityDelegate}. 3818 */ 3819 void sendAccessibilityEventInternal(int eventType) { 3820 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3821 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3822 } 3823 } 3824 3825 /** 3826 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3827 * takes as an argument an empty {@link AccessibilityEvent} and does not 3828 * perform a check whether accessibility is enabled. 3829 * <p> 3830 * If an {@link AccessibilityDelegate} has been specified via calling 3831 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3832 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 3833 * is responsible for handling this call. 3834 * </p> 3835 * 3836 * @param event The event to send. 3837 * 3838 * @see #sendAccessibilityEvent(int) 3839 */ 3840 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3841 if (mAccessibilityDelegate != null) { 3842 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 3843 } else { 3844 sendAccessibilityEventUncheckedInternal(event); 3845 } 3846 } 3847 3848 /** 3849 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 3850 * 3851 * Note: Called from the default {@link AccessibilityDelegate}. 3852 */ 3853 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 3854 if (!isShown()) { 3855 return; 3856 } 3857 onInitializeAccessibilityEvent(event); 3858 dispatchPopulateAccessibilityEvent(event); 3859 // In the beginning we called #isShown(), so we know that getParent() is not null. 3860 getParent().requestSendAccessibilityEvent(this, event); 3861 } 3862 3863 /** 3864 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 3865 * to its children for adding their text content to the event. Note that the 3866 * event text is populated in a separate dispatch path since we add to the 3867 * event not only the text of the source but also the text of all its descendants. 3868 * A typical implementation will call 3869 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 3870 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3871 * on each child. Override this method if custom population of the event text 3872 * content is required. 3873 * <p> 3874 * If an {@link AccessibilityDelegate} has been specified via calling 3875 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3876 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 3877 * is responsible for handling this call. 3878 * </p> 3879 * 3880 * @param event The event. 3881 * 3882 * @return True if the event population was completed. 3883 */ 3884 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3885 if (mAccessibilityDelegate != null) { 3886 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 3887 } else { 3888 return dispatchPopulateAccessibilityEventInternal(event); 3889 } 3890 } 3891 3892 /** 3893 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3894 * 3895 * Note: Called from the default {@link AccessibilityDelegate}. 3896 */ 3897 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 3898 // Do not populate text to scroll events. They describe position change 3899 // and usually come from container with a lot of text which is not very 3900 // informative for accessibility purposes. Also they are fired frequently. 3901 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_SCROLLED) { 3902 return true; 3903 } 3904 onPopulateAccessibilityEvent(event); 3905 return false; 3906 } 3907 3908 /** 3909 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3910 * giving a chance to this View to populate the accessibility event with its 3911 * text content. While the implementation is free to modify other event 3912 * attributes this should be performed in 3913 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 3914 * <p> 3915 * Example: Adding formatted date string to an accessibility event in addition 3916 * to the text added by the super implementation. 3917 * </p><p><pre><code> 3918 * public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3919 * super.onPopulateAccessibilityEvent(event); 3920 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 3921 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 3922 * mCurrentDate.getTimeInMillis(), flags); 3923 * event.getText().add(selectedDateUtterance); 3924 * } 3925 * </code></pre></p> 3926 * <p> 3927 * If an {@link AccessibilityDelegate} has been specified via calling 3928 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3929 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 3930 * is responsible for handling this call. 3931 * </p> 3932 * 3933 * @param event The accessibility event which to populate. 3934 * 3935 * @see #sendAccessibilityEvent(int) 3936 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3937 */ 3938 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3939 if (mAccessibilityDelegate != null) { 3940 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 3941 } else { 3942 onPopulateAccessibilityEventInternal(event); 3943 } 3944 } 3945 3946 /** 3947 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 3948 * 3949 * Note: Called from the default {@link AccessibilityDelegate}. 3950 */ 3951 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 3952 3953 } 3954 3955 /** 3956 * Initializes an {@link AccessibilityEvent} with information about 3957 * this View which is the event source. In other words, the source of 3958 * an accessibility event is the view whose state change triggered firing 3959 * the event. 3960 * <p> 3961 * Example: Setting the password property of an event in addition 3962 * to properties set by the super implementation. 3963 * </p><p><pre><code> 3964 * public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3965 * super.onInitializeAccessibilityEvent(event); 3966 * event.setPassword(true); 3967 * } 3968 * </code></pre></p> 3969 * <p> 3970 * If an {@link AccessibilityDelegate} has been specified via calling 3971 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 3972 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 3973 * is responsible for handling this call. 3974 * </p> 3975 * 3976 * @param event The event to initialize. 3977 * 3978 * @see #sendAccessibilityEvent(int) 3979 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3980 */ 3981 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3982 if (mAccessibilityDelegate != null) { 3983 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 3984 } else { 3985 onInitializeAccessibilityEventInternal(event); 3986 } 3987 } 3988 3989 /** 3990 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3991 * 3992 * Note: Called from the default {@link AccessibilityDelegate}. 3993 */ 3994 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 3995 event.setSource(this); 3996 event.setClassName(getClass().getName()); 3997 event.setPackageName(getContext().getPackageName()); 3998 event.setEnabled(isEnabled()); 3999 event.setContentDescription(mContentDescription); 4000 4001 final int eventType = event.getEventType(); 4002 switch (eventType) { 4003 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 4004 if (mAttachInfo != null) { 4005 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 4006 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4007 FOCUSABLES_ALL); 4008 event.setItemCount(focusablesTempList.size()); 4009 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4010 focusablesTempList.clear(); 4011 } 4012 } break; 4013 case AccessibilityEvent.TYPE_VIEW_SCROLLED: { 4014 event.setScrollX(mScrollX); 4015 event.setScrollY(mScrollY); 4016 event.setItemCount(getHeight()); 4017 } break; 4018 } 4019 } 4020 4021 /** 4022 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4023 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4024 * This method is responsible for obtaining an accessibility node info from a 4025 * pool of reusable instances and calling 4026 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4027 * initialize the former. 4028 * <p> 4029 * Note: The client is responsible for recycling the obtained instance by calling 4030 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4031 * </p> 4032 * @return A populated {@link AccessibilityNodeInfo}. 4033 * 4034 * @see AccessibilityNodeInfo 4035 */ 4036 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4037 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4038 onInitializeAccessibilityNodeInfo(info); 4039 return info; 4040 } 4041 4042 /** 4043 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4044 * The base implementation sets: 4045 * <ul> 4046 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4047 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4048 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4049 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4050 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4051 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4052 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4053 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4054 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4055 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4056 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4057 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4058 * </ul> 4059 * <p> 4060 * Subclasses should override this method, call the super implementation, 4061 * and set additional attributes. 4062 * </p> 4063 * <p> 4064 * If an {@link AccessibilityDelegate} has been specified via calling 4065 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4066 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4067 * is responsible for handling this call. 4068 * </p> 4069 * 4070 * @param info The instance to initialize. 4071 */ 4072 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4073 if (mAccessibilityDelegate != null) { 4074 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4075 } else { 4076 onInitializeAccessibilityNodeInfoInternal(info); 4077 } 4078 } 4079 4080 /** 4081 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4082 * 4083 * Note: Called from the default {@link AccessibilityDelegate}. 4084 */ 4085 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4086 Rect bounds = mAttachInfo.mTmpInvalRect; 4087 getDrawingRect(bounds); 4088 info.setBoundsInParent(bounds); 4089 4090 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 4091 getLocationOnScreen(locationOnScreen); 4092 bounds.offsetTo(0, 0); 4093 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 4094 info.setBoundsInScreen(bounds); 4095 4096 ViewParent parent = getParent(); 4097 if (parent instanceof View) { 4098 View parentView = (View) parent; 4099 info.setParent(parentView); 4100 } 4101 4102 info.setPackageName(mContext.getPackageName()); 4103 info.setClassName(getClass().getName()); 4104 info.setContentDescription(getContentDescription()); 4105 4106 info.setEnabled(isEnabled()); 4107 info.setClickable(isClickable()); 4108 info.setFocusable(isFocusable()); 4109 info.setFocused(isFocused()); 4110 info.setSelected(isSelected()); 4111 info.setLongClickable(isLongClickable()); 4112 4113 // TODO: These make sense only if we are in an AdapterView but all 4114 // views can be selected. Maybe from accessiiblity perspective 4115 // we should report as selectable view in an AdapterView. 4116 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4117 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4118 4119 if (isFocusable()) { 4120 if (isFocused()) { 4121 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4122 } else { 4123 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4124 } 4125 } 4126 } 4127 4128 /** 4129 * Sets a delegate for implementing accessibility support via compositon as 4130 * opposed to inheritance. The delegate's primary use is for implementing 4131 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4132 * 4133 * @param delegate The delegate instance. 4134 * 4135 * @see AccessibilityDelegate 4136 */ 4137 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4138 mAccessibilityDelegate = delegate; 4139 } 4140 4141 /** 4142 * Gets the unique identifier of this view on the screen for accessibility purposes. 4143 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4144 * 4145 * @return The view accessibility id. 4146 * 4147 * @hide 4148 */ 4149 public int getAccessibilityViewId() { 4150 if (mAccessibilityViewId == NO_ID) { 4151 mAccessibilityViewId = sNextAccessibilityViewId++; 4152 } 4153 return mAccessibilityViewId; 4154 } 4155 4156 /** 4157 * Gets the unique identifier of the window in which this View reseides. 4158 * 4159 * @return The window accessibility id. 4160 * 4161 * @hide 4162 */ 4163 public int getAccessibilityWindowId() { 4164 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4165 } 4166 4167 /** 4168 * Gets the {@link View} description. It briefly describes the view and is 4169 * primarily used for accessibility support. Set this property to enable 4170 * better accessibility support for your application. This is especially 4171 * true for views that do not have textual representation (For example, 4172 * ImageButton). 4173 * 4174 * @return The content descriptiopn. 4175 * 4176 * @attr ref android.R.styleable#View_contentDescription 4177 */ 4178 public CharSequence getContentDescription() { 4179 return mContentDescription; 4180 } 4181 4182 /** 4183 * Sets the {@link View} description. It briefly describes the view and is 4184 * primarily used for accessibility support. Set this property to enable 4185 * better accessibility support for your application. This is especially 4186 * true for views that do not have textual representation (For example, 4187 * ImageButton). 4188 * 4189 * @param contentDescription The content description. 4190 * 4191 * @attr ref android.R.styleable#View_contentDescription 4192 */ 4193 public void setContentDescription(CharSequence contentDescription) { 4194 mContentDescription = contentDescription; 4195 } 4196 4197 /** 4198 * Invoked whenever this view loses focus, either by losing window focus or by losing 4199 * focus within its window. This method can be used to clear any state tied to the 4200 * focus. For instance, if a button is held pressed with the trackball and the window 4201 * loses focus, this method can be used to cancel the press. 4202 * 4203 * Subclasses of View overriding this method should always call super.onFocusLost(). 4204 * 4205 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4206 * @see #onWindowFocusChanged(boolean) 4207 * 4208 * @hide pending API council approval 4209 */ 4210 protected void onFocusLost() { 4211 resetPressedState(); 4212 } 4213 4214 private void resetPressedState() { 4215 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4216 return; 4217 } 4218 4219 if (isPressed()) { 4220 setPressed(false); 4221 4222 if (!mHasPerformedLongPress) { 4223 removeLongPressCallback(); 4224 } 4225 } 4226 } 4227 4228 /** 4229 * Returns true if this view has focus 4230 * 4231 * @return True if this view has focus, false otherwise. 4232 */ 4233 @ViewDebug.ExportedProperty(category = "focus") 4234 public boolean isFocused() { 4235 return (mPrivateFlags & FOCUSED) != 0; 4236 } 4237 4238 /** 4239 * Find the view in the hierarchy rooted at this view that currently has 4240 * focus. 4241 * 4242 * @return The view that currently has focus, or null if no focused view can 4243 * be found. 4244 */ 4245 public View findFocus() { 4246 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4247 } 4248 4249 /** 4250 * Change whether this view is one of the set of scrollable containers in 4251 * its window. This will be used to determine whether the window can 4252 * resize or must pan when a soft input area is open -- scrollable 4253 * containers allow the window to use resize mode since the container 4254 * will appropriately shrink. 4255 */ 4256 public void setScrollContainer(boolean isScrollContainer) { 4257 if (isScrollContainer) { 4258 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4259 mAttachInfo.mScrollContainers.add(this); 4260 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4261 } 4262 mPrivateFlags |= SCROLL_CONTAINER; 4263 } else { 4264 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4265 mAttachInfo.mScrollContainers.remove(this); 4266 } 4267 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4268 } 4269 } 4270 4271 /** 4272 * Returns the quality of the drawing cache. 4273 * 4274 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4275 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4276 * 4277 * @see #setDrawingCacheQuality(int) 4278 * @see #setDrawingCacheEnabled(boolean) 4279 * @see #isDrawingCacheEnabled() 4280 * 4281 * @attr ref android.R.styleable#View_drawingCacheQuality 4282 */ 4283 public int getDrawingCacheQuality() { 4284 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4285 } 4286 4287 /** 4288 * Set the drawing cache quality of this view. This value is used only when the 4289 * drawing cache is enabled 4290 * 4291 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4292 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4293 * 4294 * @see #getDrawingCacheQuality() 4295 * @see #setDrawingCacheEnabled(boolean) 4296 * @see #isDrawingCacheEnabled() 4297 * 4298 * @attr ref android.R.styleable#View_drawingCacheQuality 4299 */ 4300 public void setDrawingCacheQuality(int quality) { 4301 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4302 } 4303 4304 /** 4305 * Returns whether the screen should remain on, corresponding to the current 4306 * value of {@link #KEEP_SCREEN_ON}. 4307 * 4308 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4309 * 4310 * @see #setKeepScreenOn(boolean) 4311 * 4312 * @attr ref android.R.styleable#View_keepScreenOn 4313 */ 4314 public boolean getKeepScreenOn() { 4315 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4316 } 4317 4318 /** 4319 * Controls whether the screen should remain on, modifying the 4320 * value of {@link #KEEP_SCREEN_ON}. 4321 * 4322 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4323 * 4324 * @see #getKeepScreenOn() 4325 * 4326 * @attr ref android.R.styleable#View_keepScreenOn 4327 */ 4328 public void setKeepScreenOn(boolean keepScreenOn) { 4329 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4330 } 4331 4332 /** 4333 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4334 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4335 * 4336 * @attr ref android.R.styleable#View_nextFocusLeft 4337 */ 4338 public int getNextFocusLeftId() { 4339 return mNextFocusLeftId; 4340 } 4341 4342 /** 4343 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4344 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4345 * decide automatically. 4346 * 4347 * @attr ref android.R.styleable#View_nextFocusLeft 4348 */ 4349 public void setNextFocusLeftId(int nextFocusLeftId) { 4350 mNextFocusLeftId = nextFocusLeftId; 4351 } 4352 4353 /** 4354 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4355 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4356 * 4357 * @attr ref android.R.styleable#View_nextFocusRight 4358 */ 4359 public int getNextFocusRightId() { 4360 return mNextFocusRightId; 4361 } 4362 4363 /** 4364 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4365 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4366 * decide automatically. 4367 * 4368 * @attr ref android.R.styleable#View_nextFocusRight 4369 */ 4370 public void setNextFocusRightId(int nextFocusRightId) { 4371 mNextFocusRightId = nextFocusRightId; 4372 } 4373 4374 /** 4375 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4376 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4377 * 4378 * @attr ref android.R.styleable#View_nextFocusUp 4379 */ 4380 public int getNextFocusUpId() { 4381 return mNextFocusUpId; 4382 } 4383 4384 /** 4385 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4386 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4387 * decide automatically. 4388 * 4389 * @attr ref android.R.styleable#View_nextFocusUp 4390 */ 4391 public void setNextFocusUpId(int nextFocusUpId) { 4392 mNextFocusUpId = nextFocusUpId; 4393 } 4394 4395 /** 4396 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4397 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4398 * 4399 * @attr ref android.R.styleable#View_nextFocusDown 4400 */ 4401 public int getNextFocusDownId() { 4402 return mNextFocusDownId; 4403 } 4404 4405 /** 4406 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4407 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4408 * decide automatically. 4409 * 4410 * @attr ref android.R.styleable#View_nextFocusDown 4411 */ 4412 public void setNextFocusDownId(int nextFocusDownId) { 4413 mNextFocusDownId = nextFocusDownId; 4414 } 4415 4416 /** 4417 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4418 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4419 * 4420 * @attr ref android.R.styleable#View_nextFocusForward 4421 */ 4422 public int getNextFocusForwardId() { 4423 return mNextFocusForwardId; 4424 } 4425 4426 /** 4427 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4428 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4429 * decide automatically. 4430 * 4431 * @attr ref android.R.styleable#View_nextFocusForward 4432 */ 4433 public void setNextFocusForwardId(int nextFocusForwardId) { 4434 mNextFocusForwardId = nextFocusForwardId; 4435 } 4436 4437 /** 4438 * Returns the visibility of this view and all of its ancestors 4439 * 4440 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4441 */ 4442 public boolean isShown() { 4443 View current = this; 4444 //noinspection ConstantConditions 4445 do { 4446 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4447 return false; 4448 } 4449 ViewParent parent = current.mParent; 4450 if (parent == null) { 4451 return false; // We are not attached to the view root 4452 } 4453 if (!(parent instanceof View)) { 4454 return true; 4455 } 4456 current = (View) parent; 4457 } while (current != null); 4458 4459 return false; 4460 } 4461 4462 /** 4463 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4464 * is set 4465 * 4466 * @param insets Insets for system windows 4467 * 4468 * @return True if this view applied the insets, false otherwise 4469 */ 4470 protected boolean fitSystemWindows(Rect insets) { 4471 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4472 mPaddingLeft = insets.left; 4473 mPaddingTop = insets.top; 4474 mPaddingRight = insets.right; 4475 mPaddingBottom = insets.bottom; 4476 requestLayout(); 4477 return true; 4478 } 4479 return false; 4480 } 4481 4482 /** 4483 * Set whether or not this view should account for system screen decorations 4484 * such as the status bar and inset its content. This allows this view to be 4485 * positioned in absolute screen coordinates and remain visible to the user. 4486 * 4487 * <p>This should only be used by top-level window decor views. 4488 * 4489 * @param fitSystemWindows true to inset content for system screen decorations, false for 4490 * default behavior. 4491 * 4492 * @attr ref android.R.styleable#View_fitsSystemWindows 4493 */ 4494 public void setFitsSystemWindows(boolean fitSystemWindows) { 4495 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 4496 } 4497 4498 /** 4499 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 4500 * will account for system screen decorations such as the status bar and inset its 4501 * content. This allows the view to be positioned in absolute screen coordinates 4502 * and remain visible to the user. 4503 * 4504 * @return true if this view will adjust its content bounds for system screen decorations. 4505 * 4506 * @attr ref android.R.styleable#View_fitsSystemWindows 4507 */ 4508 public boolean fitsSystemWindows() { 4509 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 4510 } 4511 4512 /** 4513 * Returns the visibility status for this view. 4514 * 4515 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4516 * @attr ref android.R.styleable#View_visibility 4517 */ 4518 @ViewDebug.ExportedProperty(mapping = { 4519 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4520 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4521 @ViewDebug.IntToString(from = GONE, to = "GONE") 4522 }) 4523 public int getVisibility() { 4524 return mViewFlags & VISIBILITY_MASK; 4525 } 4526 4527 /** 4528 * Set the enabled state of this view. 4529 * 4530 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4531 * @attr ref android.R.styleable#View_visibility 4532 */ 4533 @RemotableViewMethod 4534 public void setVisibility(int visibility) { 4535 setFlags(visibility, VISIBILITY_MASK); 4536 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4537 } 4538 4539 /** 4540 * Returns the enabled status for this view. The interpretation of the 4541 * enabled state varies by subclass. 4542 * 4543 * @return True if this view is enabled, false otherwise. 4544 */ 4545 @ViewDebug.ExportedProperty 4546 public boolean isEnabled() { 4547 return (mViewFlags & ENABLED_MASK) == ENABLED; 4548 } 4549 4550 /** 4551 * Set the enabled state of this view. The interpretation of the enabled 4552 * state varies by subclass. 4553 * 4554 * @param enabled True if this view is enabled, false otherwise. 4555 */ 4556 @RemotableViewMethod 4557 public void setEnabled(boolean enabled) { 4558 if (enabled == isEnabled()) return; 4559 4560 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4561 4562 /* 4563 * The View most likely has to change its appearance, so refresh 4564 * the drawable state. 4565 */ 4566 refreshDrawableState(); 4567 4568 // Invalidate too, since the default behavior for views is to be 4569 // be drawn at 50% alpha rather than to change the drawable. 4570 invalidate(true); 4571 } 4572 4573 /** 4574 * Set whether this view can receive the focus. 4575 * 4576 * Setting this to false will also ensure that this view is not focusable 4577 * in touch mode. 4578 * 4579 * @param focusable If true, this view can receive the focus. 4580 * 4581 * @see #setFocusableInTouchMode(boolean) 4582 * @attr ref android.R.styleable#View_focusable 4583 */ 4584 public void setFocusable(boolean focusable) { 4585 if (!focusable) { 4586 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4587 } 4588 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4589 } 4590 4591 /** 4592 * Set whether this view can receive focus while in touch mode. 4593 * 4594 * Setting this to true will also ensure that this view is focusable. 4595 * 4596 * @param focusableInTouchMode If true, this view can receive the focus while 4597 * in touch mode. 4598 * 4599 * @see #setFocusable(boolean) 4600 * @attr ref android.R.styleable#View_focusableInTouchMode 4601 */ 4602 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4603 // Focusable in touch mode should always be set before the focusable flag 4604 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4605 // which, in touch mode, will not successfully request focus on this view 4606 // because the focusable in touch mode flag is not set 4607 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4608 if (focusableInTouchMode) { 4609 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4610 } 4611 } 4612 4613 /** 4614 * Set whether this view should have sound effects enabled for events such as 4615 * clicking and touching. 4616 * 4617 * <p>You may wish to disable sound effects for a view if you already play sounds, 4618 * for instance, a dial key that plays dtmf tones. 4619 * 4620 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4621 * @see #isSoundEffectsEnabled() 4622 * @see #playSoundEffect(int) 4623 * @attr ref android.R.styleable#View_soundEffectsEnabled 4624 */ 4625 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4626 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4627 } 4628 4629 /** 4630 * @return whether this view should have sound effects enabled for events such as 4631 * clicking and touching. 4632 * 4633 * @see #setSoundEffectsEnabled(boolean) 4634 * @see #playSoundEffect(int) 4635 * @attr ref android.R.styleable#View_soundEffectsEnabled 4636 */ 4637 @ViewDebug.ExportedProperty 4638 public boolean isSoundEffectsEnabled() { 4639 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4640 } 4641 4642 /** 4643 * Set whether this view should have haptic feedback for events such as 4644 * long presses. 4645 * 4646 * <p>You may wish to disable haptic feedback if your view already controls 4647 * its own haptic feedback. 4648 * 4649 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4650 * @see #isHapticFeedbackEnabled() 4651 * @see #performHapticFeedback(int) 4652 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4653 */ 4654 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4655 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4656 } 4657 4658 /** 4659 * @return whether this view should have haptic feedback enabled for events 4660 * long presses. 4661 * 4662 * @see #setHapticFeedbackEnabled(boolean) 4663 * @see #performHapticFeedback(int) 4664 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4665 */ 4666 @ViewDebug.ExportedProperty 4667 public boolean isHapticFeedbackEnabled() { 4668 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4669 } 4670 4671 /** 4672 * Returns the layout direction for this view. 4673 * 4674 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4675 * {@link #LAYOUT_DIRECTION_RTL}, 4676 * {@link #LAYOUT_DIRECTION_INHERIT} or 4677 * {@link #LAYOUT_DIRECTION_LOCALE}. 4678 * @attr ref android.R.styleable#View_layoutDirection 4679 * 4680 * @hide 4681 */ 4682 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4683 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4684 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4685 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4686 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4687 }) 4688 public int getLayoutDirection() { 4689 return mViewFlags & LAYOUT_DIRECTION_MASK; 4690 } 4691 4692 /** 4693 * Set the layout direction for this view. This will propagate a reset of layout direction 4694 * resolution to the view's children and resolve layout direction for this view. 4695 * 4696 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4697 * {@link #LAYOUT_DIRECTION_RTL}, 4698 * {@link #LAYOUT_DIRECTION_INHERIT} or 4699 * {@link #LAYOUT_DIRECTION_LOCALE}. 4700 * 4701 * @attr ref android.R.styleable#View_layoutDirection 4702 * 4703 * @hide 4704 */ 4705 @RemotableViewMethod 4706 public void setLayoutDirection(int layoutDirection) { 4707 if (getLayoutDirection() != layoutDirection) { 4708 resetResolvedLayoutDirection(); 4709 // Setting the flag will also request a layout. 4710 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4711 } 4712 } 4713 4714 /** 4715 * Returns the resolved layout direction for this view. 4716 * 4717 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4718 * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL. 4719 * 4720 * @hide 4721 */ 4722 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4723 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4724 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4725 }) 4726 public int getResolvedLayoutDirection() { 4727 resolveLayoutDirectionIfNeeded(); 4728 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 4729 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4730 } 4731 4732 /** 4733 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 4734 * layout attribute and/or the inherited value from the parent.</p> 4735 * 4736 * @return true if the layout is right-to-left. 4737 * 4738 * @hide 4739 */ 4740 @ViewDebug.ExportedProperty(category = "layout") 4741 public boolean isLayoutRtl() { 4742 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4743 } 4744 4745 /** 4746 * If this view doesn't do any drawing on its own, set this flag to 4747 * allow further optimizations. By default, this flag is not set on 4748 * View, but could be set on some View subclasses such as ViewGroup. 4749 * 4750 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4751 * you should clear this flag. 4752 * 4753 * @param willNotDraw whether or not this View draw on its own 4754 */ 4755 public void setWillNotDraw(boolean willNotDraw) { 4756 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4757 } 4758 4759 /** 4760 * Returns whether or not this View draws on its own. 4761 * 4762 * @return true if this view has nothing to draw, false otherwise 4763 */ 4764 @ViewDebug.ExportedProperty(category = "drawing") 4765 public boolean willNotDraw() { 4766 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4767 } 4768 4769 /** 4770 * When a View's drawing cache is enabled, drawing is redirected to an 4771 * offscreen bitmap. Some views, like an ImageView, must be able to 4772 * bypass this mechanism if they already draw a single bitmap, to avoid 4773 * unnecessary usage of the memory. 4774 * 4775 * @param willNotCacheDrawing true if this view does not cache its 4776 * drawing, false otherwise 4777 */ 4778 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 4779 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 4780 } 4781 4782 /** 4783 * Returns whether or not this View can cache its drawing or not. 4784 * 4785 * @return true if this view does not cache its drawing, false otherwise 4786 */ 4787 @ViewDebug.ExportedProperty(category = "drawing") 4788 public boolean willNotCacheDrawing() { 4789 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 4790 } 4791 4792 /** 4793 * Indicates whether this view reacts to click events or not. 4794 * 4795 * @return true if the view is clickable, false otherwise 4796 * 4797 * @see #setClickable(boolean) 4798 * @attr ref android.R.styleable#View_clickable 4799 */ 4800 @ViewDebug.ExportedProperty 4801 public boolean isClickable() { 4802 return (mViewFlags & CLICKABLE) == CLICKABLE; 4803 } 4804 4805 /** 4806 * Enables or disables click events for this view. When a view 4807 * is clickable it will change its state to "pressed" on every click. 4808 * Subclasses should set the view clickable to visually react to 4809 * user's clicks. 4810 * 4811 * @param clickable true to make the view clickable, false otherwise 4812 * 4813 * @see #isClickable() 4814 * @attr ref android.R.styleable#View_clickable 4815 */ 4816 public void setClickable(boolean clickable) { 4817 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 4818 } 4819 4820 /** 4821 * Indicates whether this view reacts to long click events or not. 4822 * 4823 * @return true if the view is long clickable, false otherwise 4824 * 4825 * @see #setLongClickable(boolean) 4826 * @attr ref android.R.styleable#View_longClickable 4827 */ 4828 public boolean isLongClickable() { 4829 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4830 } 4831 4832 /** 4833 * Enables or disables long click events for this view. When a view is long 4834 * clickable it reacts to the user holding down the button for a longer 4835 * duration than a tap. This event can either launch the listener or a 4836 * context menu. 4837 * 4838 * @param longClickable true to make the view long clickable, false otherwise 4839 * @see #isLongClickable() 4840 * @attr ref android.R.styleable#View_longClickable 4841 */ 4842 public void setLongClickable(boolean longClickable) { 4843 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4844 } 4845 4846 /** 4847 * Sets the pressed state for this view. 4848 * 4849 * @see #isClickable() 4850 * @see #setClickable(boolean) 4851 * 4852 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4853 * the View's internal state from a previously set "pressed" state. 4854 */ 4855 public void setPressed(boolean pressed) { 4856 if (pressed) { 4857 mPrivateFlags |= PRESSED; 4858 } else { 4859 mPrivateFlags &= ~PRESSED; 4860 } 4861 refreshDrawableState(); 4862 dispatchSetPressed(pressed); 4863 } 4864 4865 /** 4866 * Dispatch setPressed to all of this View's children. 4867 * 4868 * @see #setPressed(boolean) 4869 * 4870 * @param pressed The new pressed state 4871 */ 4872 protected void dispatchSetPressed(boolean pressed) { 4873 } 4874 4875 /** 4876 * Indicates whether the view is currently in pressed state. Unless 4877 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 4878 * the pressed state. 4879 * 4880 * @see #setPressed(boolean) 4881 * @see #isClickable() 4882 * @see #setClickable(boolean) 4883 * 4884 * @return true if the view is currently pressed, false otherwise 4885 */ 4886 public boolean isPressed() { 4887 return (mPrivateFlags & PRESSED) == PRESSED; 4888 } 4889 4890 /** 4891 * Indicates whether this view will save its state (that is, 4892 * whether its {@link #onSaveInstanceState} method will be called). 4893 * 4894 * @return Returns true if the view state saving is enabled, else false. 4895 * 4896 * @see #setSaveEnabled(boolean) 4897 * @attr ref android.R.styleable#View_saveEnabled 4898 */ 4899 public boolean isSaveEnabled() { 4900 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 4901 } 4902 4903 /** 4904 * Controls whether the saving of this view's state is 4905 * enabled (that is, whether its {@link #onSaveInstanceState} method 4906 * will be called). Note that even if freezing is enabled, the 4907 * view still must have an id assigned to it (via {@link #setId(int)}) 4908 * for its state to be saved. This flag can only disable the 4909 * saving of this view; any child views may still have their state saved. 4910 * 4911 * @param enabled Set to false to <em>disable</em> state saving, or true 4912 * (the default) to allow it. 4913 * 4914 * @see #isSaveEnabled() 4915 * @see #setId(int) 4916 * @see #onSaveInstanceState() 4917 * @attr ref android.R.styleable#View_saveEnabled 4918 */ 4919 public void setSaveEnabled(boolean enabled) { 4920 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 4921 } 4922 4923 /** 4924 * Gets whether the framework should discard touches when the view's 4925 * window is obscured by another visible window. 4926 * Refer to the {@link View} security documentation for more details. 4927 * 4928 * @return True if touch filtering is enabled. 4929 * 4930 * @see #setFilterTouchesWhenObscured(boolean) 4931 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4932 */ 4933 @ViewDebug.ExportedProperty 4934 public boolean getFilterTouchesWhenObscured() { 4935 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4936 } 4937 4938 /** 4939 * Sets whether the framework should discard touches when the view's 4940 * window is obscured by another visible window. 4941 * Refer to the {@link View} security documentation for more details. 4942 * 4943 * @param enabled True if touch filtering should be enabled. 4944 * 4945 * @see #getFilterTouchesWhenObscured 4946 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4947 */ 4948 public void setFilterTouchesWhenObscured(boolean enabled) { 4949 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4950 FILTER_TOUCHES_WHEN_OBSCURED); 4951 } 4952 4953 /** 4954 * Indicates whether the entire hierarchy under this view will save its 4955 * state when a state saving traversal occurs from its parent. The default 4956 * is true; if false, these views will not be saved unless 4957 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4958 * 4959 * @return Returns true if the view state saving from parent is enabled, else false. 4960 * 4961 * @see #setSaveFromParentEnabled(boolean) 4962 */ 4963 public boolean isSaveFromParentEnabled() { 4964 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4965 } 4966 4967 /** 4968 * Controls whether the entire hierarchy under this view will save its 4969 * state when a state saving traversal occurs from its parent. The default 4970 * is true; if false, these views will not be saved unless 4971 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4972 * 4973 * @param enabled Set to false to <em>disable</em> state saving, or true 4974 * (the default) to allow it. 4975 * 4976 * @see #isSaveFromParentEnabled() 4977 * @see #setId(int) 4978 * @see #onSaveInstanceState() 4979 */ 4980 public void setSaveFromParentEnabled(boolean enabled) { 4981 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4982 } 4983 4984 4985 /** 4986 * Returns whether this View is able to take focus. 4987 * 4988 * @return True if this view can take focus, or false otherwise. 4989 * @attr ref android.R.styleable#View_focusable 4990 */ 4991 @ViewDebug.ExportedProperty(category = "focus") 4992 public final boolean isFocusable() { 4993 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4994 } 4995 4996 /** 4997 * When a view is focusable, it may not want to take focus when in touch mode. 4998 * For example, a button would like focus when the user is navigating via a D-pad 4999 * so that the user can click on it, but once the user starts touching the screen, 5000 * the button shouldn't take focus 5001 * @return Whether the view is focusable in touch mode. 5002 * @attr ref android.R.styleable#View_focusableInTouchMode 5003 */ 5004 @ViewDebug.ExportedProperty 5005 public final boolean isFocusableInTouchMode() { 5006 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5007 } 5008 5009 /** 5010 * Find the nearest view in the specified direction that can take focus. 5011 * This does not actually give focus to that view. 5012 * 5013 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5014 * 5015 * @return The nearest focusable in the specified direction, or null if none 5016 * can be found. 5017 */ 5018 public View focusSearch(int direction) { 5019 if (mParent != null) { 5020 return mParent.focusSearch(this, direction); 5021 } else { 5022 return null; 5023 } 5024 } 5025 5026 /** 5027 * This method is the last chance for the focused view and its ancestors to 5028 * respond to an arrow key. This is called when the focused view did not 5029 * consume the key internally, nor could the view system find a new view in 5030 * the requested direction to give focus to. 5031 * 5032 * @param focused The currently focused view. 5033 * @param direction The direction focus wants to move. One of FOCUS_UP, 5034 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5035 * @return True if the this view consumed this unhandled move. 5036 */ 5037 public boolean dispatchUnhandledMove(View focused, int direction) { 5038 return false; 5039 } 5040 5041 /** 5042 * If a user manually specified the next view id for a particular direction, 5043 * use the root to look up the view. 5044 * @param root The root view of the hierarchy containing this view. 5045 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5046 * or FOCUS_BACKWARD. 5047 * @return The user specified next view, or null if there is none. 5048 */ 5049 View findUserSetNextFocus(View root, int direction) { 5050 switch (direction) { 5051 case FOCUS_LEFT: 5052 if (mNextFocusLeftId == View.NO_ID) return null; 5053 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5054 case FOCUS_RIGHT: 5055 if (mNextFocusRightId == View.NO_ID) return null; 5056 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5057 case FOCUS_UP: 5058 if (mNextFocusUpId == View.NO_ID) return null; 5059 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5060 case FOCUS_DOWN: 5061 if (mNextFocusDownId == View.NO_ID) return null; 5062 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5063 case FOCUS_FORWARD: 5064 if (mNextFocusForwardId == View.NO_ID) return null; 5065 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5066 case FOCUS_BACKWARD: { 5067 final int id = mID; 5068 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5069 @Override 5070 public boolean apply(View t) { 5071 return t.mNextFocusForwardId == id; 5072 } 5073 }); 5074 } 5075 } 5076 return null; 5077 } 5078 5079 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5080 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5081 @Override 5082 public boolean apply(View t) { 5083 return t.mID == childViewId; 5084 } 5085 }); 5086 5087 if (result == null) { 5088 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5089 + "by user for id " + childViewId); 5090 } 5091 return result; 5092 } 5093 5094 /** 5095 * Find and return all focusable views that are descendants of this view, 5096 * possibly including this view if it is focusable itself. 5097 * 5098 * @param direction The direction of the focus 5099 * @return A list of focusable views 5100 */ 5101 public ArrayList<View> getFocusables(int direction) { 5102 ArrayList<View> result = new ArrayList<View>(24); 5103 addFocusables(result, direction); 5104 return result; 5105 } 5106 5107 /** 5108 * Add any focusable views that are descendants of this view (possibly 5109 * including this view if it is focusable itself) to views. If we are in touch mode, 5110 * only add views that are also focusable in touch mode. 5111 * 5112 * @param views Focusable views found so far 5113 * @param direction The direction of the focus 5114 */ 5115 public void addFocusables(ArrayList<View> views, int direction) { 5116 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5117 } 5118 5119 /** 5120 * Adds any focusable views that are descendants of this view (possibly 5121 * including this view if it is focusable itself) to views. This method 5122 * adds all focusable views regardless if we are in touch mode or 5123 * only views focusable in touch mode if we are in touch mode depending on 5124 * the focusable mode paramater. 5125 * 5126 * @param views Focusable views found so far or null if all we are interested is 5127 * the number of focusables. 5128 * @param direction The direction of the focus. 5129 * @param focusableMode The type of focusables to be added. 5130 * 5131 * @see #FOCUSABLES_ALL 5132 * @see #FOCUSABLES_TOUCH_MODE 5133 */ 5134 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5135 if (!isFocusable()) { 5136 return; 5137 } 5138 5139 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 5140 isInTouchMode() && !isFocusableInTouchMode()) { 5141 return; 5142 } 5143 5144 if (views != null) { 5145 views.add(this); 5146 } 5147 } 5148 5149 /** 5150 * Finds the Views that contain given text. The containment is case insensitive. 5151 * The search is performed by either the text that the View renders or the content 5152 * description that describes the view for accessibility purposes and the view does 5153 * not render or both. Clients can specify how the search is to be performed via 5154 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5155 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5156 * 5157 * @param outViews The output list of matching Views. 5158 * @param searched The text to match against. 5159 * 5160 * @see #FIND_VIEWS_WITH_TEXT 5161 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 5162 * @see #setContentDescription(CharSequence) 5163 */ 5164 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 5165 if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 && !TextUtils.isEmpty(searched) 5166 && !TextUtils.isEmpty(mContentDescription)) { 5167 String searchedLowerCase = searched.toString().toLowerCase(); 5168 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 5169 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 5170 outViews.add(this); 5171 } 5172 } 5173 } 5174 5175 /** 5176 * Find and return all touchable views that are descendants of this view, 5177 * possibly including this view if it is touchable itself. 5178 * 5179 * @return A list of touchable views 5180 */ 5181 public ArrayList<View> getTouchables() { 5182 ArrayList<View> result = new ArrayList<View>(); 5183 addTouchables(result); 5184 return result; 5185 } 5186 5187 /** 5188 * Add any touchable views that are descendants of this view (possibly 5189 * including this view if it is touchable itself) to views. 5190 * 5191 * @param views Touchable views found so far 5192 */ 5193 public void addTouchables(ArrayList<View> views) { 5194 final int viewFlags = mViewFlags; 5195 5196 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5197 && (viewFlags & ENABLED_MASK) == ENABLED) { 5198 views.add(this); 5199 } 5200 } 5201 5202 /** 5203 * Call this to try to give focus to a specific view or to one of its 5204 * descendants. 5205 * 5206 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5207 * false), or if it is focusable and it is not focusable in touch mode 5208 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5209 * 5210 * See also {@link #focusSearch(int)}, which is what you call to say that you 5211 * have focus, and you want your parent to look for the next one. 5212 * 5213 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 5214 * {@link #FOCUS_DOWN} and <code>null</code>. 5215 * 5216 * @return Whether this view or one of its descendants actually took focus. 5217 */ 5218 public final boolean requestFocus() { 5219 return requestFocus(View.FOCUS_DOWN); 5220 } 5221 5222 5223 /** 5224 * Call this to try to give focus to a specific view or to one of its 5225 * descendants and give it a hint about what direction focus is heading. 5226 * 5227 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5228 * false), or if it is focusable and it is not focusable in touch mode 5229 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5230 * 5231 * See also {@link #focusSearch(int)}, which is what you call to say that you 5232 * have focus, and you want your parent to look for the next one. 5233 * 5234 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 5235 * <code>null</code> set for the previously focused rectangle. 5236 * 5237 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5238 * @return Whether this view or one of its descendants actually took focus. 5239 */ 5240 public final boolean requestFocus(int direction) { 5241 return requestFocus(direction, null); 5242 } 5243 5244 /** 5245 * Call this to try to give focus to a specific view or to one of its descendants 5246 * and give it hints about the direction and a specific rectangle that the focus 5247 * is coming from. The rectangle can help give larger views a finer grained hint 5248 * about where focus is coming from, and therefore, where to show selection, or 5249 * forward focus change internally. 5250 * 5251 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5252 * false), or if it is focusable and it is not focusable in touch mode 5253 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5254 * 5255 * A View will not take focus if it is not visible. 5256 * 5257 * A View will not take focus if one of its parents has 5258 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 5259 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 5260 * 5261 * See also {@link #focusSearch(int)}, which is what you call to say that you 5262 * have focus, and you want your parent to look for the next one. 5263 * 5264 * You may wish to override this method if your custom {@link View} has an internal 5265 * {@link View} that it wishes to forward the request to. 5266 * 5267 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5268 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 5269 * to give a finer grained hint about where focus is coming from. May be null 5270 * if there is no hint. 5271 * @return Whether this view or one of its descendants actually took focus. 5272 */ 5273 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 5274 // need to be focusable 5275 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 5276 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5277 return false; 5278 } 5279 5280 // need to be focusable in touch mode if in touch mode 5281 if (isInTouchMode() && 5282 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 5283 return false; 5284 } 5285 5286 // need to not have any parents blocking us 5287 if (hasAncestorThatBlocksDescendantFocus()) { 5288 return false; 5289 } 5290 5291 handleFocusGainInternal(direction, previouslyFocusedRect); 5292 return true; 5293 } 5294 5295 /** Gets the ViewAncestor, or null if not attached. */ 5296 /*package*/ ViewRootImpl getViewRootImpl() { 5297 View root = getRootView(); 5298 return root != null ? (ViewRootImpl)root.getParent() : null; 5299 } 5300 5301 /** 5302 * Call this to try to give focus to a specific view or to one of its descendants. This is a 5303 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 5304 * touch mode to request focus when they are touched. 5305 * 5306 * @return Whether this view or one of its descendants actually took focus. 5307 * 5308 * @see #isInTouchMode() 5309 * 5310 */ 5311 public final boolean requestFocusFromTouch() { 5312 // Leave touch mode if we need to 5313 if (isInTouchMode()) { 5314 ViewRootImpl viewRoot = getViewRootImpl(); 5315 if (viewRoot != null) { 5316 viewRoot.ensureTouchMode(false); 5317 } 5318 } 5319 return requestFocus(View.FOCUS_DOWN); 5320 } 5321 5322 /** 5323 * @return Whether any ancestor of this view blocks descendant focus. 5324 */ 5325 private boolean hasAncestorThatBlocksDescendantFocus() { 5326 ViewParent ancestor = mParent; 5327 while (ancestor instanceof ViewGroup) { 5328 final ViewGroup vgAncestor = (ViewGroup) ancestor; 5329 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 5330 return true; 5331 } else { 5332 ancestor = vgAncestor.getParent(); 5333 } 5334 } 5335 return false; 5336 } 5337 5338 /** 5339 * @hide 5340 */ 5341 public void dispatchStartTemporaryDetach() { 5342 onStartTemporaryDetach(); 5343 } 5344 5345 /** 5346 * This is called when a container is going to temporarily detach a child, with 5347 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 5348 * It will either be followed by {@link #onFinishTemporaryDetach()} or 5349 * {@link #onDetachedFromWindow()} when the container is done. 5350 */ 5351 public void onStartTemporaryDetach() { 5352 removeUnsetPressCallback(); 5353 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 5354 } 5355 5356 /** 5357 * @hide 5358 */ 5359 public void dispatchFinishTemporaryDetach() { 5360 onFinishTemporaryDetach(); 5361 } 5362 5363 /** 5364 * Called after {@link #onStartTemporaryDetach} when the container is done 5365 * changing the view. 5366 */ 5367 public void onFinishTemporaryDetach() { 5368 } 5369 5370 /** 5371 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 5372 * for this view's window. Returns null if the view is not currently attached 5373 * to the window. Normally you will not need to use this directly, but 5374 * just use the standard high-level event callbacks like 5375 * {@link #onKeyDown(int, KeyEvent)}. 5376 */ 5377 public KeyEvent.DispatcherState getKeyDispatcherState() { 5378 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 5379 } 5380 5381 /** 5382 * Dispatch a key event before it is processed by any input method 5383 * associated with the view hierarchy. This can be used to intercept 5384 * key events in special situations before the IME consumes them; a 5385 * typical example would be handling the BACK key to update the application's 5386 * UI instead of allowing the IME to see it and close itself. 5387 * 5388 * @param event The key event to be dispatched. 5389 * @return True if the event was handled, false otherwise. 5390 */ 5391 public boolean dispatchKeyEventPreIme(KeyEvent event) { 5392 return onKeyPreIme(event.getKeyCode(), event); 5393 } 5394 5395 /** 5396 * Dispatch a key event to the next view on the focus path. This path runs 5397 * from the top of the view tree down to the currently focused view. If this 5398 * view has focus, it will dispatch to itself. Otherwise it will dispatch 5399 * the next node down the focus path. This method also fires any key 5400 * listeners. 5401 * 5402 * @param event The key event to be dispatched. 5403 * @return True if the event was handled, false otherwise. 5404 */ 5405 public boolean dispatchKeyEvent(KeyEvent event) { 5406 if (mInputEventConsistencyVerifier != null) { 5407 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 5408 } 5409 5410 // Give any attached key listener a first crack at the event. 5411 //noinspection SimplifiableIfStatement 5412 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5413 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 5414 return true; 5415 } 5416 5417 if (event.dispatch(this, mAttachInfo != null 5418 ? mAttachInfo.mKeyDispatchState : null, this)) { 5419 return true; 5420 } 5421 5422 if (mInputEventConsistencyVerifier != null) { 5423 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5424 } 5425 return false; 5426 } 5427 5428 /** 5429 * Dispatches a key shortcut event. 5430 * 5431 * @param event The key event to be dispatched. 5432 * @return True if the event was handled by the view, false otherwise. 5433 */ 5434 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5435 return onKeyShortcut(event.getKeyCode(), event); 5436 } 5437 5438 /** 5439 * Pass the touch screen motion event down to the target view, or this 5440 * view if it is the target. 5441 * 5442 * @param event The motion event to be dispatched. 5443 * @return True if the event was handled by the view, false otherwise. 5444 */ 5445 public boolean dispatchTouchEvent(MotionEvent event) { 5446 if (mInputEventConsistencyVerifier != null) { 5447 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5448 } 5449 5450 if (onFilterTouchEventForSecurity(event)) { 5451 //noinspection SimplifiableIfStatement 5452 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 5453 mOnTouchListener.onTouch(this, event)) { 5454 return true; 5455 } 5456 5457 if (onTouchEvent(event)) { 5458 return true; 5459 } 5460 } 5461 5462 if (mInputEventConsistencyVerifier != null) { 5463 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5464 } 5465 return false; 5466 } 5467 5468 /** 5469 * Filter the touch event to apply security policies. 5470 * 5471 * @param event The motion event to be filtered. 5472 * @return True if the event should be dispatched, false if the event should be dropped. 5473 * 5474 * @see #getFilterTouchesWhenObscured 5475 */ 5476 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5477 //noinspection RedundantIfStatement 5478 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5479 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5480 // Window is obscured, drop this touch. 5481 return false; 5482 } 5483 return true; 5484 } 5485 5486 /** 5487 * Pass a trackball motion event down to the focused view. 5488 * 5489 * @param event The motion event to be dispatched. 5490 * @return True if the event was handled by the view, false otherwise. 5491 */ 5492 public boolean dispatchTrackballEvent(MotionEvent event) { 5493 if (mInputEventConsistencyVerifier != null) { 5494 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5495 } 5496 5497 return onTrackballEvent(event); 5498 } 5499 5500 /** 5501 * Dispatch a generic motion event. 5502 * <p> 5503 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5504 * are delivered to the view under the pointer. All other generic motion events are 5505 * delivered to the focused view. Hover events are handled specially and are delivered 5506 * to {@link #onHoverEvent(MotionEvent)}. 5507 * </p> 5508 * 5509 * @param event The motion event to be dispatched. 5510 * @return True if the event was handled by the view, false otherwise. 5511 */ 5512 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5513 if (mInputEventConsistencyVerifier != null) { 5514 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5515 } 5516 5517 final int source = event.getSource(); 5518 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5519 final int action = event.getAction(); 5520 if (action == MotionEvent.ACTION_HOVER_ENTER 5521 || action == MotionEvent.ACTION_HOVER_MOVE 5522 || action == MotionEvent.ACTION_HOVER_EXIT) { 5523 if (dispatchHoverEvent(event)) { 5524 return true; 5525 } 5526 } else if (dispatchGenericPointerEvent(event)) { 5527 return true; 5528 } 5529 } else if (dispatchGenericFocusedEvent(event)) { 5530 return true; 5531 } 5532 5533 if (dispatchGenericMotionEventInternal(event)) { 5534 return true; 5535 } 5536 5537 if (mInputEventConsistencyVerifier != null) { 5538 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5539 } 5540 return false; 5541 } 5542 5543 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 5544 //noinspection SimplifiableIfStatement 5545 if (mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5546 && mOnGenericMotionListener.onGenericMotion(this, event)) { 5547 return true; 5548 } 5549 5550 if (onGenericMotionEvent(event)) { 5551 return true; 5552 } 5553 5554 if (mInputEventConsistencyVerifier != null) { 5555 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5556 } 5557 return false; 5558 } 5559 5560 /** 5561 * Dispatch a hover event. 5562 * <p> 5563 * Do not call this method directly. 5564 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5565 * </p> 5566 * 5567 * @param event The motion event to be dispatched. 5568 * @return True if the event was handled by the view, false otherwise. 5569 */ 5570 protected boolean dispatchHoverEvent(MotionEvent event) { 5571 //noinspection SimplifiableIfStatement 5572 if (mOnHoverListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5573 && mOnHoverListener.onHover(this, event)) { 5574 return true; 5575 } 5576 5577 return onHoverEvent(event); 5578 } 5579 5580 /** 5581 * Returns true if the view has a child to which it has recently sent 5582 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 5583 * it does not have a hovered child, then it must be the innermost hovered view. 5584 * @hide 5585 */ 5586 protected boolean hasHoveredChild() { 5587 return false; 5588 } 5589 5590 /** 5591 * Dispatch a generic motion event to the view under the first pointer. 5592 * <p> 5593 * Do not call this method directly. 5594 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5595 * </p> 5596 * 5597 * @param event The motion event to be dispatched. 5598 * @return True if the event was handled by the view, false otherwise. 5599 */ 5600 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5601 return false; 5602 } 5603 5604 /** 5605 * Dispatch a generic motion event to the currently focused view. 5606 * <p> 5607 * Do not call this method directly. 5608 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5609 * </p> 5610 * 5611 * @param event The motion event to be dispatched. 5612 * @return True if the event was handled by the view, false otherwise. 5613 */ 5614 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5615 return false; 5616 } 5617 5618 /** 5619 * Dispatch a pointer event. 5620 * <p> 5621 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5622 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5623 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5624 * and should not be expected to handle other pointing device features. 5625 * </p> 5626 * 5627 * @param event The motion event to be dispatched. 5628 * @return True if the event was handled by the view, false otherwise. 5629 * @hide 5630 */ 5631 public final boolean dispatchPointerEvent(MotionEvent event) { 5632 if (event.isTouchEvent()) { 5633 return dispatchTouchEvent(event); 5634 } else { 5635 return dispatchGenericMotionEvent(event); 5636 } 5637 } 5638 5639 /** 5640 * Called when the window containing this view gains or loses window focus. 5641 * ViewGroups should override to route to their children. 5642 * 5643 * @param hasFocus True if the window containing this view now has focus, 5644 * false otherwise. 5645 */ 5646 public void dispatchWindowFocusChanged(boolean hasFocus) { 5647 onWindowFocusChanged(hasFocus); 5648 } 5649 5650 /** 5651 * Called when the window containing this view gains or loses focus. Note 5652 * that this is separate from view focus: to receive key events, both 5653 * your view and its window must have focus. If a window is displayed 5654 * on top of yours that takes input focus, then your own window will lose 5655 * focus but the view focus will remain unchanged. 5656 * 5657 * @param hasWindowFocus True if the window containing this view now has 5658 * focus, false otherwise. 5659 */ 5660 public void onWindowFocusChanged(boolean hasWindowFocus) { 5661 InputMethodManager imm = InputMethodManager.peekInstance(); 5662 if (!hasWindowFocus) { 5663 if (isPressed()) { 5664 setPressed(false); 5665 } 5666 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5667 imm.focusOut(this); 5668 } 5669 removeLongPressCallback(); 5670 removeTapCallback(); 5671 onFocusLost(); 5672 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5673 imm.focusIn(this); 5674 } 5675 refreshDrawableState(); 5676 } 5677 5678 /** 5679 * Returns true if this view is in a window that currently has window focus. 5680 * Note that this is not the same as the view itself having focus. 5681 * 5682 * @return True if this view is in a window that currently has window focus. 5683 */ 5684 public boolean hasWindowFocus() { 5685 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5686 } 5687 5688 /** 5689 * Dispatch a view visibility change down the view hierarchy. 5690 * ViewGroups should override to route to their children. 5691 * @param changedView The view whose visibility changed. Could be 'this' or 5692 * an ancestor view. 5693 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5694 * {@link #INVISIBLE} or {@link #GONE}. 5695 */ 5696 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5697 onVisibilityChanged(changedView, visibility); 5698 } 5699 5700 /** 5701 * Called when the visibility of the view or an ancestor of the view is changed. 5702 * @param changedView The view whose visibility changed. Could be 'this' or 5703 * an ancestor view. 5704 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5705 * {@link #INVISIBLE} or {@link #GONE}. 5706 */ 5707 protected void onVisibilityChanged(View changedView, int visibility) { 5708 if (visibility == VISIBLE) { 5709 if (mAttachInfo != null) { 5710 initialAwakenScrollBars(); 5711 } else { 5712 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5713 } 5714 } 5715 } 5716 5717 /** 5718 * Dispatch a hint about whether this view is displayed. For instance, when 5719 * a View moves out of the screen, it might receives a display hint indicating 5720 * the view is not displayed. Applications should not <em>rely</em> on this hint 5721 * as there is no guarantee that they will receive one. 5722 * 5723 * @param hint A hint about whether or not this view is displayed: 5724 * {@link #VISIBLE} or {@link #INVISIBLE}. 5725 */ 5726 public void dispatchDisplayHint(int hint) { 5727 onDisplayHint(hint); 5728 } 5729 5730 /** 5731 * Gives this view a hint about whether is displayed or not. For instance, when 5732 * a View moves out of the screen, it might receives a display hint indicating 5733 * the view is not displayed. Applications should not <em>rely</em> on this hint 5734 * as there is no guarantee that they will receive one. 5735 * 5736 * @param hint A hint about whether or not this view is displayed: 5737 * {@link #VISIBLE} or {@link #INVISIBLE}. 5738 */ 5739 protected void onDisplayHint(int hint) { 5740 } 5741 5742 /** 5743 * Dispatch a window visibility change down the view hierarchy. 5744 * ViewGroups should override to route to their children. 5745 * 5746 * @param visibility The new visibility of the window. 5747 * 5748 * @see #onWindowVisibilityChanged(int) 5749 */ 5750 public void dispatchWindowVisibilityChanged(int visibility) { 5751 onWindowVisibilityChanged(visibility); 5752 } 5753 5754 /** 5755 * Called when the window containing has change its visibility 5756 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5757 * that this tells you whether or not your window is being made visible 5758 * to the window manager; this does <em>not</em> tell you whether or not 5759 * your window is obscured by other windows on the screen, even if it 5760 * is itself visible. 5761 * 5762 * @param visibility The new visibility of the window. 5763 */ 5764 protected void onWindowVisibilityChanged(int visibility) { 5765 if (visibility == VISIBLE) { 5766 initialAwakenScrollBars(); 5767 } 5768 } 5769 5770 /** 5771 * Returns the current visibility of the window this view is attached to 5772 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 5773 * 5774 * @return Returns the current visibility of the view's window. 5775 */ 5776 public int getWindowVisibility() { 5777 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 5778 } 5779 5780 /** 5781 * Retrieve the overall visible display size in which the window this view is 5782 * attached to has been positioned in. This takes into account screen 5783 * decorations above the window, for both cases where the window itself 5784 * is being position inside of them or the window is being placed under 5785 * then and covered insets are used for the window to position its content 5786 * inside. In effect, this tells you the available area where content can 5787 * be placed and remain visible to users. 5788 * 5789 * <p>This function requires an IPC back to the window manager to retrieve 5790 * the requested information, so should not be used in performance critical 5791 * code like drawing. 5792 * 5793 * @param outRect Filled in with the visible display frame. If the view 5794 * is not attached to a window, this is simply the raw display size. 5795 */ 5796 public void getWindowVisibleDisplayFrame(Rect outRect) { 5797 if (mAttachInfo != null) { 5798 try { 5799 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 5800 } catch (RemoteException e) { 5801 return; 5802 } 5803 // XXX This is really broken, and probably all needs to be done 5804 // in the window manager, and we need to know more about whether 5805 // we want the area behind or in front of the IME. 5806 final Rect insets = mAttachInfo.mVisibleInsets; 5807 outRect.left += insets.left; 5808 outRect.top += insets.top; 5809 outRect.right -= insets.right; 5810 outRect.bottom -= insets.bottom; 5811 return; 5812 } 5813 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 5814 d.getRectSize(outRect); 5815 } 5816 5817 /** 5818 * Dispatch a notification about a resource configuration change down 5819 * the view hierarchy. 5820 * ViewGroups should override to route to their children. 5821 * 5822 * @param newConfig The new resource configuration. 5823 * 5824 * @see #onConfigurationChanged(android.content.res.Configuration) 5825 */ 5826 public void dispatchConfigurationChanged(Configuration newConfig) { 5827 onConfigurationChanged(newConfig); 5828 } 5829 5830 /** 5831 * Called when the current configuration of the resources being used 5832 * by the application have changed. You can use this to decide when 5833 * to reload resources that can changed based on orientation and other 5834 * configuration characterstics. You only need to use this if you are 5835 * not relying on the normal {@link android.app.Activity} mechanism of 5836 * recreating the activity instance upon a configuration change. 5837 * 5838 * @param newConfig The new resource configuration. 5839 */ 5840 protected void onConfigurationChanged(Configuration newConfig) { 5841 } 5842 5843 /** 5844 * Private function to aggregate all per-view attributes in to the view 5845 * root. 5846 */ 5847 void dispatchCollectViewAttributes(int visibility) { 5848 performCollectViewAttributes(visibility); 5849 } 5850 5851 void performCollectViewAttributes(int visibility) { 5852 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 5853 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 5854 mAttachInfo.mKeepScreenOn = true; 5855 } 5856 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 5857 if (mOnSystemUiVisibilityChangeListener != null) { 5858 mAttachInfo.mHasSystemUiListeners = true; 5859 } 5860 } 5861 } 5862 5863 void needGlobalAttributesUpdate(boolean force) { 5864 final AttachInfo ai = mAttachInfo; 5865 if (ai != null) { 5866 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 5867 || ai.mHasSystemUiListeners) { 5868 ai.mRecomputeGlobalAttributes = true; 5869 } 5870 } 5871 } 5872 5873 /** 5874 * Returns whether the device is currently in touch mode. Touch mode is entered 5875 * once the user begins interacting with the device by touch, and affects various 5876 * things like whether focus is always visible to the user. 5877 * 5878 * @return Whether the device is in touch mode. 5879 */ 5880 @ViewDebug.ExportedProperty 5881 public boolean isInTouchMode() { 5882 if (mAttachInfo != null) { 5883 return mAttachInfo.mInTouchMode; 5884 } else { 5885 return ViewRootImpl.isInTouchMode(); 5886 } 5887 } 5888 5889 /** 5890 * Returns the context the view is running in, through which it can 5891 * access the current theme, resources, etc. 5892 * 5893 * @return The view's Context. 5894 */ 5895 @ViewDebug.CapturedViewProperty 5896 public final Context getContext() { 5897 return mContext; 5898 } 5899 5900 /** 5901 * Handle a key event before it is processed by any input method 5902 * associated with the view hierarchy. This can be used to intercept 5903 * key events in special situations before the IME consumes them; a 5904 * typical example would be handling the BACK key to update the application's 5905 * UI instead of allowing the IME to see it and close itself. 5906 * 5907 * @param keyCode The value in event.getKeyCode(). 5908 * @param event Description of the key event. 5909 * @return If you handled the event, return true. If you want to allow the 5910 * event to be handled by the next receiver, return false. 5911 */ 5912 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 5913 return false; 5914 } 5915 5916 /** 5917 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 5918 * KeyEvent.Callback.onKeyDown()}: perform press of the view 5919 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 5920 * is released, if the view is enabled and clickable. 5921 * 5922 * @param keyCode A key code that represents the button pressed, from 5923 * {@link android.view.KeyEvent}. 5924 * @param event The KeyEvent object that defines the button action. 5925 */ 5926 public boolean onKeyDown(int keyCode, KeyEvent event) { 5927 boolean result = false; 5928 5929 switch (keyCode) { 5930 case KeyEvent.KEYCODE_DPAD_CENTER: 5931 case KeyEvent.KEYCODE_ENTER: { 5932 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5933 return true; 5934 } 5935 // Long clickable items don't necessarily have to be clickable 5936 if (((mViewFlags & CLICKABLE) == CLICKABLE || 5937 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 5938 (event.getRepeatCount() == 0)) { 5939 setPressed(true); 5940 checkForLongClick(0); 5941 return true; 5942 } 5943 break; 5944 } 5945 } 5946 return result; 5947 } 5948 5949 /** 5950 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 5951 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 5952 * the event). 5953 */ 5954 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 5955 return false; 5956 } 5957 5958 /** 5959 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 5960 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 5961 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 5962 * {@link KeyEvent#KEYCODE_ENTER} is released. 5963 * 5964 * @param keyCode A key code that represents the button pressed, from 5965 * {@link android.view.KeyEvent}. 5966 * @param event The KeyEvent object that defines the button action. 5967 */ 5968 public boolean onKeyUp(int keyCode, KeyEvent event) { 5969 boolean result = false; 5970 5971 switch (keyCode) { 5972 case KeyEvent.KEYCODE_DPAD_CENTER: 5973 case KeyEvent.KEYCODE_ENTER: { 5974 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5975 return true; 5976 } 5977 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 5978 setPressed(false); 5979 5980 if (!mHasPerformedLongPress) { 5981 // This is a tap, so remove the longpress check 5982 removeLongPressCallback(); 5983 5984 result = performClick(); 5985 } 5986 } 5987 break; 5988 } 5989 } 5990 return result; 5991 } 5992 5993 /** 5994 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 5995 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 5996 * the event). 5997 * 5998 * @param keyCode A key code that represents the button pressed, from 5999 * {@link android.view.KeyEvent}. 6000 * @param repeatCount The number of times the action was made. 6001 * @param event The KeyEvent object that defines the button action. 6002 */ 6003 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 6004 return false; 6005 } 6006 6007 /** 6008 * Called on the focused view when a key shortcut event is not handled. 6009 * Override this method to implement local key shortcuts for the View. 6010 * Key shortcuts can also be implemented by setting the 6011 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 6012 * 6013 * @param keyCode The value in event.getKeyCode(). 6014 * @param event Description of the key event. 6015 * @return If you handled the event, return true. If you want to allow the 6016 * event to be handled by the next receiver, return false. 6017 */ 6018 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 6019 return false; 6020 } 6021 6022 /** 6023 * Check whether the called view is a text editor, in which case it 6024 * would make sense to automatically display a soft input window for 6025 * it. Subclasses should override this if they implement 6026 * {@link #onCreateInputConnection(EditorInfo)} to return true if 6027 * a call on that method would return a non-null InputConnection, and 6028 * they are really a first-class editor that the user would normally 6029 * start typing on when the go into a window containing your view. 6030 * 6031 * <p>The default implementation always returns false. This does 6032 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 6033 * will not be called or the user can not otherwise perform edits on your 6034 * view; it is just a hint to the system that this is not the primary 6035 * purpose of this view. 6036 * 6037 * @return Returns true if this view is a text editor, else false. 6038 */ 6039 public boolean onCheckIsTextEditor() { 6040 return false; 6041 } 6042 6043 /** 6044 * Create a new InputConnection for an InputMethod to interact 6045 * with the view. The default implementation returns null, since it doesn't 6046 * support input methods. You can override this to implement such support. 6047 * This is only needed for views that take focus and text input. 6048 * 6049 * <p>When implementing this, you probably also want to implement 6050 * {@link #onCheckIsTextEditor()} to indicate you will return a 6051 * non-null InputConnection. 6052 * 6053 * @param outAttrs Fill in with attribute information about the connection. 6054 */ 6055 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 6056 return null; 6057 } 6058 6059 /** 6060 * Called by the {@link android.view.inputmethod.InputMethodManager} 6061 * when a view who is not the current 6062 * input connection target is trying to make a call on the manager. The 6063 * default implementation returns false; you can override this to return 6064 * true for certain views if you are performing InputConnection proxying 6065 * to them. 6066 * @param view The View that is making the InputMethodManager call. 6067 * @return Return true to allow the call, false to reject. 6068 */ 6069 public boolean checkInputConnectionProxy(View view) { 6070 return false; 6071 } 6072 6073 /** 6074 * Show the context menu for this view. It is not safe to hold on to the 6075 * menu after returning from this method. 6076 * 6077 * You should normally not overload this method. Overload 6078 * {@link #onCreateContextMenu(ContextMenu)} or define an 6079 * {@link OnCreateContextMenuListener} to add items to the context menu. 6080 * 6081 * @param menu The context menu to populate 6082 */ 6083 public void createContextMenu(ContextMenu menu) { 6084 ContextMenuInfo menuInfo = getContextMenuInfo(); 6085 6086 // Sets the current menu info so all items added to menu will have 6087 // my extra info set. 6088 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 6089 6090 onCreateContextMenu(menu); 6091 if (mOnCreateContextMenuListener != null) { 6092 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 6093 } 6094 6095 // Clear the extra information so subsequent items that aren't mine don't 6096 // have my extra info. 6097 ((MenuBuilder)menu).setCurrentMenuInfo(null); 6098 6099 if (mParent != null) { 6100 mParent.createContextMenu(menu); 6101 } 6102 } 6103 6104 /** 6105 * Views should implement this if they have extra information to associate 6106 * with the context menu. The return result is supplied as a parameter to 6107 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 6108 * callback. 6109 * 6110 * @return Extra information about the item for which the context menu 6111 * should be shown. This information will vary across different 6112 * subclasses of View. 6113 */ 6114 protected ContextMenuInfo getContextMenuInfo() { 6115 return null; 6116 } 6117 6118 /** 6119 * Views should implement this if the view itself is going to add items to 6120 * the context menu. 6121 * 6122 * @param menu the context menu to populate 6123 */ 6124 protected void onCreateContextMenu(ContextMenu menu) { 6125 } 6126 6127 /** 6128 * Implement this method to handle trackball motion events. The 6129 * <em>relative</em> movement of the trackball since the last event 6130 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 6131 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 6132 * that a movement of 1 corresponds to the user pressing one DPAD key (so 6133 * they will often be fractional values, representing the more fine-grained 6134 * movement information available from a trackball). 6135 * 6136 * @param event The motion event. 6137 * @return True if the event was handled, false otherwise. 6138 */ 6139 public boolean onTrackballEvent(MotionEvent event) { 6140 return false; 6141 } 6142 6143 /** 6144 * Implement this method to handle generic motion events. 6145 * <p> 6146 * Generic motion events describe joystick movements, mouse hovers, track pad 6147 * touches, scroll wheel movements and other input events. The 6148 * {@link MotionEvent#getSource() source} of the motion event specifies 6149 * the class of input that was received. Implementations of this method 6150 * must examine the bits in the source before processing the event. 6151 * The following code example shows how this is done. 6152 * </p><p> 6153 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6154 * are delivered to the view under the pointer. All other generic motion events are 6155 * delivered to the focused view. 6156 * </p> 6157 * <code> 6158 * public boolean onGenericMotionEvent(MotionEvent event) { 6159 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 6160 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 6161 * // process the joystick movement... 6162 * return true; 6163 * } 6164 * } 6165 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6166 * switch (event.getAction()) { 6167 * case MotionEvent.ACTION_HOVER_MOVE: 6168 * // process the mouse hover movement... 6169 * return true; 6170 * case MotionEvent.ACTION_SCROLL: 6171 * // process the scroll wheel movement... 6172 * return true; 6173 * } 6174 * } 6175 * return super.onGenericMotionEvent(event); 6176 * } 6177 * </code> 6178 * 6179 * @param event The generic motion event being processed. 6180 * @return True if the event was handled, false otherwise. 6181 */ 6182 public boolean onGenericMotionEvent(MotionEvent event) { 6183 return false; 6184 } 6185 6186 /** 6187 * Implement this method to handle hover events. 6188 * <p> 6189 * This method is called whenever a pointer is hovering into, over, or out of the 6190 * bounds of a view and the view is not currently being touched. 6191 * Hover events are represented as pointer events with action 6192 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 6193 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 6194 * </p> 6195 * <ul> 6196 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 6197 * when the pointer enters the bounds of the view.</li> 6198 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 6199 * when the pointer has already entered the bounds of the view and has moved.</li> 6200 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 6201 * when the pointer has exited the bounds of the view or when the pointer is 6202 * about to go down due to a button click, tap, or similar user action that 6203 * causes the view to be touched.</li> 6204 * </ul> 6205 * <p> 6206 * The view should implement this method to return true to indicate that it is 6207 * handling the hover event, such as by changing its drawable state. 6208 * </p><p> 6209 * The default implementation calls {@link #setHovered} to update the hovered state 6210 * of the view when a hover enter or hover exit event is received, if the view 6211 * is enabled and is clickable. The default implementation also sends hover 6212 * accessibility events. 6213 * </p> 6214 * 6215 * @param event The motion event that describes the hover. 6216 * @return True if the view handled the hover event. 6217 * 6218 * @see #isHovered 6219 * @see #setHovered 6220 * @see #onHoverChanged 6221 */ 6222 public boolean onHoverEvent(MotionEvent event) { 6223 // The root view may receive hover (or touch) events that are outside the bounds of 6224 // the window. This code ensures that we only send accessibility events for 6225 // hovers that are actually within the bounds of the root view. 6226 final int action = event.getAction(); 6227 if (!mSendingHoverAccessibilityEvents) { 6228 if ((action == MotionEvent.ACTION_HOVER_ENTER 6229 || action == MotionEvent.ACTION_HOVER_MOVE) 6230 && !hasHoveredChild() 6231 && pointInView(event.getX(), event.getY())) { 6232 mSendingHoverAccessibilityEvents = true; 6233 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 6234 } 6235 } else { 6236 if (action == MotionEvent.ACTION_HOVER_EXIT 6237 || (action == MotionEvent.ACTION_HOVER_MOVE 6238 && !pointInView(event.getX(), event.getY()))) { 6239 mSendingHoverAccessibilityEvents = false; 6240 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 6241 } 6242 } 6243 6244 if (isHoverable()) { 6245 switch (action) { 6246 case MotionEvent.ACTION_HOVER_ENTER: 6247 setHovered(true); 6248 break; 6249 case MotionEvent.ACTION_HOVER_EXIT: 6250 setHovered(false); 6251 break; 6252 } 6253 6254 // Dispatch the event to onGenericMotionEvent before returning true. 6255 // This is to provide compatibility with existing applications that 6256 // handled HOVER_MOVE events in onGenericMotionEvent and that would 6257 // break because of the new default handling for hoverable views 6258 // in onHoverEvent. 6259 // Note that onGenericMotionEvent will be called by default when 6260 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 6261 dispatchGenericMotionEventInternal(event); 6262 return true; 6263 } 6264 return false; 6265 } 6266 6267 /** 6268 * Returns true if the view should handle {@link #onHoverEvent} 6269 * by calling {@link #setHovered} to change its hovered state. 6270 * 6271 * @return True if the view is hoverable. 6272 */ 6273 private boolean isHoverable() { 6274 final int viewFlags = mViewFlags; 6275 //noinspection SimplifiableIfStatement 6276 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6277 return false; 6278 } 6279 6280 return (viewFlags & CLICKABLE) == CLICKABLE 6281 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6282 } 6283 6284 /** 6285 * Returns true if the view is currently hovered. 6286 * 6287 * @return True if the view is currently hovered. 6288 * 6289 * @see #setHovered 6290 * @see #onHoverChanged 6291 */ 6292 @ViewDebug.ExportedProperty 6293 public boolean isHovered() { 6294 return (mPrivateFlags & HOVERED) != 0; 6295 } 6296 6297 /** 6298 * Sets whether the view is currently hovered. 6299 * <p> 6300 * Calling this method also changes the drawable state of the view. This 6301 * enables the view to react to hover by using different drawable resources 6302 * to change its appearance. 6303 * </p><p> 6304 * The {@link #onHoverChanged} method is called when the hovered state changes. 6305 * </p> 6306 * 6307 * @param hovered True if the view is hovered. 6308 * 6309 * @see #isHovered 6310 * @see #onHoverChanged 6311 */ 6312 public void setHovered(boolean hovered) { 6313 if (hovered) { 6314 if ((mPrivateFlags & HOVERED) == 0) { 6315 mPrivateFlags |= HOVERED; 6316 refreshDrawableState(); 6317 onHoverChanged(true); 6318 } 6319 } else { 6320 if ((mPrivateFlags & HOVERED) != 0) { 6321 mPrivateFlags &= ~HOVERED; 6322 refreshDrawableState(); 6323 onHoverChanged(false); 6324 } 6325 } 6326 } 6327 6328 /** 6329 * Implement this method to handle hover state changes. 6330 * <p> 6331 * This method is called whenever the hover state changes as a result of a 6332 * call to {@link #setHovered}. 6333 * </p> 6334 * 6335 * @param hovered The current hover state, as returned by {@link #isHovered}. 6336 * 6337 * @see #isHovered 6338 * @see #setHovered 6339 */ 6340 public void onHoverChanged(boolean hovered) { 6341 } 6342 6343 /** 6344 * Implement this method to handle touch screen motion events. 6345 * 6346 * @param event The motion event. 6347 * @return True if the event was handled, false otherwise. 6348 */ 6349 public boolean onTouchEvent(MotionEvent event) { 6350 final int viewFlags = mViewFlags; 6351 6352 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6353 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 6354 mPrivateFlags &= ~PRESSED; 6355 refreshDrawableState(); 6356 } 6357 // A disabled view that is clickable still consumes the touch 6358 // events, it just doesn't respond to them. 6359 return (((viewFlags & CLICKABLE) == CLICKABLE || 6360 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 6361 } 6362 6363 if (mTouchDelegate != null) { 6364 if (mTouchDelegate.onTouchEvent(event)) { 6365 return true; 6366 } 6367 } 6368 6369 if (((viewFlags & CLICKABLE) == CLICKABLE || 6370 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 6371 switch (event.getAction()) { 6372 case MotionEvent.ACTION_UP: 6373 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 6374 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 6375 // take focus if we don't have it already and we should in 6376 // touch mode. 6377 boolean focusTaken = false; 6378 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 6379 focusTaken = requestFocus(); 6380 } 6381 6382 if (prepressed) { 6383 // The button is being released before we actually 6384 // showed it as pressed. Make it show the pressed 6385 // state now (before scheduling the click) to ensure 6386 // the user sees it. 6387 mPrivateFlags |= PRESSED; 6388 refreshDrawableState(); 6389 } 6390 6391 if (!mHasPerformedLongPress) { 6392 // This is a tap, so remove the longpress check 6393 removeLongPressCallback(); 6394 6395 // Only perform take click actions if we were in the pressed state 6396 if (!focusTaken) { 6397 // Use a Runnable and post this rather than calling 6398 // performClick directly. This lets other visual state 6399 // of the view update before click actions start. 6400 if (mPerformClick == null) { 6401 mPerformClick = new PerformClick(); 6402 } 6403 if (!post(mPerformClick)) { 6404 performClick(); 6405 } 6406 } 6407 } 6408 6409 if (mUnsetPressedState == null) { 6410 mUnsetPressedState = new UnsetPressedState(); 6411 } 6412 6413 if (prepressed) { 6414 postDelayed(mUnsetPressedState, 6415 ViewConfiguration.getPressedStateDuration()); 6416 } else if (!post(mUnsetPressedState)) { 6417 // If the post failed, unpress right now 6418 mUnsetPressedState.run(); 6419 } 6420 removeTapCallback(); 6421 } 6422 break; 6423 6424 case MotionEvent.ACTION_DOWN: 6425 mHasPerformedLongPress = false; 6426 6427 if (performButtonActionOnTouchDown(event)) { 6428 break; 6429 } 6430 6431 // Walk up the hierarchy to determine if we're inside a scrolling container. 6432 boolean isInScrollingContainer = isInScrollingContainer(); 6433 6434 // For views inside a scrolling container, delay the pressed feedback for 6435 // a short period in case this is a scroll. 6436 if (isInScrollingContainer) { 6437 mPrivateFlags |= PREPRESSED; 6438 if (mPendingCheckForTap == null) { 6439 mPendingCheckForTap = new CheckForTap(); 6440 } 6441 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 6442 } else { 6443 // Not inside a scrolling container, so show the feedback right away 6444 mPrivateFlags |= PRESSED; 6445 refreshDrawableState(); 6446 checkForLongClick(0); 6447 } 6448 break; 6449 6450 case MotionEvent.ACTION_CANCEL: 6451 mPrivateFlags &= ~PRESSED; 6452 refreshDrawableState(); 6453 removeTapCallback(); 6454 break; 6455 6456 case MotionEvent.ACTION_MOVE: 6457 final int x = (int) event.getX(); 6458 final int y = (int) event.getY(); 6459 6460 // Be lenient about moving outside of buttons 6461 if (!pointInView(x, y, mTouchSlop)) { 6462 // Outside button 6463 removeTapCallback(); 6464 if ((mPrivateFlags & PRESSED) != 0) { 6465 // Remove any future long press/tap checks 6466 removeLongPressCallback(); 6467 6468 // Need to switch from pressed to not pressed 6469 mPrivateFlags &= ~PRESSED; 6470 refreshDrawableState(); 6471 } 6472 } 6473 break; 6474 } 6475 return true; 6476 } 6477 6478 return false; 6479 } 6480 6481 /** 6482 * @hide 6483 */ 6484 public boolean isInScrollingContainer() { 6485 ViewParent p = getParent(); 6486 while (p != null && p instanceof ViewGroup) { 6487 if (((ViewGroup) p).shouldDelayChildPressedState()) { 6488 return true; 6489 } 6490 p = p.getParent(); 6491 } 6492 return false; 6493 } 6494 6495 /** 6496 * Remove the longpress detection timer. 6497 */ 6498 private void removeLongPressCallback() { 6499 if (mPendingCheckForLongPress != null) { 6500 removeCallbacks(mPendingCheckForLongPress); 6501 } 6502 } 6503 6504 /** 6505 * Remove the pending click action 6506 */ 6507 private void removePerformClickCallback() { 6508 if (mPerformClick != null) { 6509 removeCallbacks(mPerformClick); 6510 } 6511 } 6512 6513 /** 6514 * Remove the prepress detection timer. 6515 */ 6516 private void removeUnsetPressCallback() { 6517 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 6518 setPressed(false); 6519 removeCallbacks(mUnsetPressedState); 6520 } 6521 } 6522 6523 /** 6524 * Remove the tap detection timer. 6525 */ 6526 private void removeTapCallback() { 6527 if (mPendingCheckForTap != null) { 6528 mPrivateFlags &= ~PREPRESSED; 6529 removeCallbacks(mPendingCheckForTap); 6530 } 6531 } 6532 6533 /** 6534 * Cancels a pending long press. Your subclass can use this if you 6535 * want the context menu to come up if the user presses and holds 6536 * at the same place, but you don't want it to come up if they press 6537 * and then move around enough to cause scrolling. 6538 */ 6539 public void cancelLongPress() { 6540 removeLongPressCallback(); 6541 6542 /* 6543 * The prepressed state handled by the tap callback is a display 6544 * construct, but the tap callback will post a long press callback 6545 * less its own timeout. Remove it here. 6546 */ 6547 removeTapCallback(); 6548 } 6549 6550 /** 6551 * Remove the pending callback for sending a 6552 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 6553 */ 6554 private void removeSendViewScrolledAccessibilityEventCallback() { 6555 if (mSendViewScrolledAccessibilityEvent != null) { 6556 removeCallbacks(mSendViewScrolledAccessibilityEvent); 6557 } 6558 } 6559 6560 /** 6561 * Sets the TouchDelegate for this View. 6562 */ 6563 public void setTouchDelegate(TouchDelegate delegate) { 6564 mTouchDelegate = delegate; 6565 } 6566 6567 /** 6568 * Gets the TouchDelegate for this View. 6569 */ 6570 public TouchDelegate getTouchDelegate() { 6571 return mTouchDelegate; 6572 } 6573 6574 /** 6575 * Set flags controlling behavior of this view. 6576 * 6577 * @param flags Constant indicating the value which should be set 6578 * @param mask Constant indicating the bit range that should be changed 6579 */ 6580 void setFlags(int flags, int mask) { 6581 int old = mViewFlags; 6582 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6583 6584 int changed = mViewFlags ^ old; 6585 if (changed == 0) { 6586 return; 6587 } 6588 int privateFlags = mPrivateFlags; 6589 6590 /* Check if the FOCUSABLE bit has changed */ 6591 if (((changed & FOCUSABLE_MASK) != 0) && 6592 ((privateFlags & HAS_BOUNDS) !=0)) { 6593 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6594 && ((privateFlags & FOCUSED) != 0)) { 6595 /* Give up focus if we are no longer focusable */ 6596 clearFocus(); 6597 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6598 && ((privateFlags & FOCUSED) == 0)) { 6599 /* 6600 * Tell the view system that we are now available to take focus 6601 * if no one else already has it. 6602 */ 6603 if (mParent != null) mParent.focusableViewAvailable(this); 6604 } 6605 } 6606 6607 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6608 if ((changed & VISIBILITY_MASK) != 0) { 6609 /* 6610 * If this view is becoming visible, invalidate it in case it changed while 6611 * it was not visible. Marking it drawn ensures that the invalidation will 6612 * go through. 6613 */ 6614 mPrivateFlags |= DRAWN; 6615 invalidate(true); 6616 6617 needGlobalAttributesUpdate(true); 6618 6619 // a view becoming visible is worth notifying the parent 6620 // about in case nothing has focus. even if this specific view 6621 // isn't focusable, it may contain something that is, so let 6622 // the root view try to give this focus if nothing else does. 6623 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6624 mParent.focusableViewAvailable(this); 6625 } 6626 } 6627 } 6628 6629 /* Check if the GONE bit has changed */ 6630 if ((changed & GONE) != 0) { 6631 needGlobalAttributesUpdate(false); 6632 requestLayout(); 6633 6634 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6635 if (hasFocus()) clearFocus(); 6636 destroyDrawingCache(); 6637 if (mParent instanceof View) { 6638 // GONE views noop invalidation, so invalidate the parent 6639 ((View) mParent).invalidate(true); 6640 } 6641 // Mark the view drawn to ensure that it gets invalidated properly the next 6642 // time it is visible and gets invalidated 6643 mPrivateFlags |= DRAWN; 6644 } 6645 if (mAttachInfo != null) { 6646 mAttachInfo.mViewVisibilityChanged = true; 6647 } 6648 } 6649 6650 /* Check if the VISIBLE bit has changed */ 6651 if ((changed & INVISIBLE) != 0) { 6652 needGlobalAttributesUpdate(false); 6653 /* 6654 * If this view is becoming invisible, set the DRAWN flag so that 6655 * the next invalidate() will not be skipped. 6656 */ 6657 mPrivateFlags |= DRAWN; 6658 6659 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6660 // root view becoming invisible shouldn't clear focus 6661 if (getRootView() != this) { 6662 clearFocus(); 6663 } 6664 } 6665 if (mAttachInfo != null) { 6666 mAttachInfo.mViewVisibilityChanged = true; 6667 } 6668 } 6669 6670 if ((changed & VISIBILITY_MASK) != 0) { 6671 if (mParent instanceof ViewGroup) { 6672 ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6673 ((View) mParent).invalidate(true); 6674 } else if (mParent != null) { 6675 mParent.invalidateChild(this, null); 6676 } 6677 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6678 } 6679 6680 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6681 destroyDrawingCache(); 6682 } 6683 6684 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6685 destroyDrawingCache(); 6686 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6687 invalidateParentCaches(); 6688 } 6689 6690 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6691 destroyDrawingCache(); 6692 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6693 } 6694 6695 if ((changed & DRAW_MASK) != 0) { 6696 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6697 if (mBGDrawable != null) { 6698 mPrivateFlags &= ~SKIP_DRAW; 6699 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6700 } else { 6701 mPrivateFlags |= SKIP_DRAW; 6702 } 6703 } else { 6704 mPrivateFlags &= ~SKIP_DRAW; 6705 } 6706 requestLayout(); 6707 invalidate(true); 6708 } 6709 6710 if ((changed & KEEP_SCREEN_ON) != 0) { 6711 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6712 mParent.recomputeViewAttributes(this); 6713 } 6714 } 6715 6716 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6717 requestLayout(); 6718 } 6719 } 6720 6721 /** 6722 * Change the view's z order in the tree, so it's on top of other sibling 6723 * views 6724 */ 6725 public void bringToFront() { 6726 if (mParent != null) { 6727 mParent.bringChildToFront(this); 6728 } 6729 } 6730 6731 /** 6732 * This is called in response to an internal scroll in this view (i.e., the 6733 * view scrolled its own contents). This is typically as a result of 6734 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6735 * called. 6736 * 6737 * @param l Current horizontal scroll origin. 6738 * @param t Current vertical scroll origin. 6739 * @param oldl Previous horizontal scroll origin. 6740 * @param oldt Previous vertical scroll origin. 6741 */ 6742 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6743 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 6744 postSendViewScrolledAccessibilityEventCallback(); 6745 } 6746 6747 mBackgroundSizeChanged = true; 6748 6749 final AttachInfo ai = mAttachInfo; 6750 if (ai != null) { 6751 ai.mViewScrollChanged = true; 6752 } 6753 } 6754 6755 /** 6756 * Interface definition for a callback to be invoked when the layout bounds of a view 6757 * changes due to layout processing. 6758 */ 6759 public interface OnLayoutChangeListener { 6760 /** 6761 * Called when the focus state of a view has changed. 6762 * 6763 * @param v The view whose state has changed. 6764 * @param left The new value of the view's left property. 6765 * @param top The new value of the view's top property. 6766 * @param right The new value of the view's right property. 6767 * @param bottom The new value of the view's bottom property. 6768 * @param oldLeft The previous value of the view's left property. 6769 * @param oldTop The previous value of the view's top property. 6770 * @param oldRight The previous value of the view's right property. 6771 * @param oldBottom The previous value of the view's bottom property. 6772 */ 6773 void onLayoutChange(View v, int left, int top, int right, int bottom, 6774 int oldLeft, int oldTop, int oldRight, int oldBottom); 6775 } 6776 6777 /** 6778 * This is called during layout when the size of this view has changed. If 6779 * you were just added to the view hierarchy, you're called with the old 6780 * values of 0. 6781 * 6782 * @param w Current width of this view. 6783 * @param h Current height of this view. 6784 * @param oldw Old width of this view. 6785 * @param oldh Old height of this view. 6786 */ 6787 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 6788 } 6789 6790 /** 6791 * Called by draw to draw the child views. This may be overridden 6792 * by derived classes to gain control just before its children are drawn 6793 * (but after its own view has been drawn). 6794 * @param canvas the canvas on which to draw the view 6795 */ 6796 protected void dispatchDraw(Canvas canvas) { 6797 } 6798 6799 /** 6800 * Gets the parent of this view. Note that the parent is a 6801 * ViewParent and not necessarily a View. 6802 * 6803 * @return Parent of this view. 6804 */ 6805 public final ViewParent getParent() { 6806 return mParent; 6807 } 6808 6809 /** 6810 * Set the horizontal scrolled position of your view. This will cause a call to 6811 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6812 * invalidated. 6813 * @param value the x position to scroll to 6814 */ 6815 public void setScrollX(int value) { 6816 scrollTo(value, mScrollY); 6817 } 6818 6819 /** 6820 * Set the vertical scrolled position of your view. This will cause a call to 6821 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6822 * invalidated. 6823 * @param value the y position to scroll to 6824 */ 6825 public void setScrollY(int value) { 6826 scrollTo(mScrollX, value); 6827 } 6828 6829 /** 6830 * Return the scrolled left position of this view. This is the left edge of 6831 * the displayed part of your view. You do not need to draw any pixels 6832 * farther left, since those are outside of the frame of your view on 6833 * screen. 6834 * 6835 * @return The left edge of the displayed part of your view, in pixels. 6836 */ 6837 public final int getScrollX() { 6838 return mScrollX; 6839 } 6840 6841 /** 6842 * Return the scrolled top position of this view. This is the top edge of 6843 * the displayed part of your view. You do not need to draw any pixels above 6844 * it, since those are outside of the frame of your view on screen. 6845 * 6846 * @return The top edge of the displayed part of your view, in pixels. 6847 */ 6848 public final int getScrollY() { 6849 return mScrollY; 6850 } 6851 6852 /** 6853 * Return the width of the your view. 6854 * 6855 * @return The width of your view, in pixels. 6856 */ 6857 @ViewDebug.ExportedProperty(category = "layout") 6858 public final int getWidth() { 6859 return mRight - mLeft; 6860 } 6861 6862 /** 6863 * Return the height of your view. 6864 * 6865 * @return The height of your view, in pixels. 6866 */ 6867 @ViewDebug.ExportedProperty(category = "layout") 6868 public final int getHeight() { 6869 return mBottom - mTop; 6870 } 6871 6872 /** 6873 * Return the visible drawing bounds of your view. Fills in the output 6874 * rectangle with the values from getScrollX(), getScrollY(), 6875 * getWidth(), and getHeight(). 6876 * 6877 * @param outRect The (scrolled) drawing bounds of the view. 6878 */ 6879 public void getDrawingRect(Rect outRect) { 6880 outRect.left = mScrollX; 6881 outRect.top = mScrollY; 6882 outRect.right = mScrollX + (mRight - mLeft); 6883 outRect.bottom = mScrollY + (mBottom - mTop); 6884 } 6885 6886 /** 6887 * Like {@link #getMeasuredWidthAndState()}, but only returns the 6888 * raw width component (that is the result is masked by 6889 * {@link #MEASURED_SIZE_MASK}). 6890 * 6891 * @return The raw measured width of this view. 6892 */ 6893 public final int getMeasuredWidth() { 6894 return mMeasuredWidth & MEASURED_SIZE_MASK; 6895 } 6896 6897 /** 6898 * Return the full width measurement information for this view as computed 6899 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6900 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6901 * This should be used during measurement and layout calculations only. Use 6902 * {@link #getWidth()} to see how wide a view is after layout. 6903 * 6904 * @return The measured width of this view as a bit mask. 6905 */ 6906 public final int getMeasuredWidthAndState() { 6907 return mMeasuredWidth; 6908 } 6909 6910 /** 6911 * Like {@link #getMeasuredHeightAndState()}, but only returns the 6912 * raw width component (that is the result is masked by 6913 * {@link #MEASURED_SIZE_MASK}). 6914 * 6915 * @return The raw measured height of this view. 6916 */ 6917 public final int getMeasuredHeight() { 6918 return mMeasuredHeight & MEASURED_SIZE_MASK; 6919 } 6920 6921 /** 6922 * Return the full height measurement information for this view as computed 6923 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6924 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6925 * This should be used during measurement and layout calculations only. Use 6926 * {@link #getHeight()} to see how wide a view is after layout. 6927 * 6928 * @return The measured width of this view as a bit mask. 6929 */ 6930 public final int getMeasuredHeightAndState() { 6931 return mMeasuredHeight; 6932 } 6933 6934 /** 6935 * Return only the state bits of {@link #getMeasuredWidthAndState()} 6936 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 6937 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 6938 * and the height component is at the shifted bits 6939 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 6940 */ 6941 public final int getMeasuredState() { 6942 return (mMeasuredWidth&MEASURED_STATE_MASK) 6943 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 6944 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 6945 } 6946 6947 /** 6948 * The transform matrix of this view, which is calculated based on the current 6949 * roation, scale, and pivot properties. 6950 * 6951 * @see #getRotation() 6952 * @see #getScaleX() 6953 * @see #getScaleY() 6954 * @see #getPivotX() 6955 * @see #getPivotY() 6956 * @return The current transform matrix for the view 6957 */ 6958 public Matrix getMatrix() { 6959 if (mTransformationInfo != null) { 6960 updateMatrix(); 6961 return mTransformationInfo.mMatrix; 6962 } 6963 return Matrix.IDENTITY_MATRIX; 6964 } 6965 6966 /** 6967 * Utility function to determine if the value is far enough away from zero to be 6968 * considered non-zero. 6969 * @param value A floating point value to check for zero-ness 6970 * @return whether the passed-in value is far enough away from zero to be considered non-zero 6971 */ 6972 private static boolean nonzero(float value) { 6973 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 6974 } 6975 6976 /** 6977 * Returns true if the transform matrix is the identity matrix. 6978 * Recomputes the matrix if necessary. 6979 * 6980 * @return True if the transform matrix is the identity matrix, false otherwise. 6981 */ 6982 final boolean hasIdentityMatrix() { 6983 if (mTransformationInfo != null) { 6984 updateMatrix(); 6985 return mTransformationInfo.mMatrixIsIdentity; 6986 } 6987 return true; 6988 } 6989 6990 void ensureTransformationInfo() { 6991 if (mTransformationInfo == null) { 6992 mTransformationInfo = new TransformationInfo(); 6993 } 6994 } 6995 6996 /** 6997 * Recomputes the transform matrix if necessary. 6998 */ 6999 private void updateMatrix() { 7000 final TransformationInfo info = mTransformationInfo; 7001 if (info == null) { 7002 return; 7003 } 7004 if (info.mMatrixDirty) { 7005 // transform-related properties have changed since the last time someone 7006 // asked for the matrix; recalculate it with the current values 7007 7008 // Figure out if we need to update the pivot point 7009 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7010 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 7011 info.mPrevWidth = mRight - mLeft; 7012 info.mPrevHeight = mBottom - mTop; 7013 info.mPivotX = info.mPrevWidth / 2f; 7014 info.mPivotY = info.mPrevHeight / 2f; 7015 } 7016 } 7017 info.mMatrix.reset(); 7018 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 7019 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 7020 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 7021 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7022 } else { 7023 if (info.mCamera == null) { 7024 info.mCamera = new Camera(); 7025 info.matrix3D = new Matrix(); 7026 } 7027 info.mCamera.save(); 7028 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 7029 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 7030 info.mCamera.getMatrix(info.matrix3D); 7031 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 7032 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 7033 info.mPivotY + info.mTranslationY); 7034 info.mMatrix.postConcat(info.matrix3D); 7035 info.mCamera.restore(); 7036 } 7037 info.mMatrixDirty = false; 7038 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 7039 info.mInverseMatrixDirty = true; 7040 } 7041 } 7042 7043 /** 7044 * Utility method to retrieve the inverse of the current mMatrix property. 7045 * We cache the matrix to avoid recalculating it when transform properties 7046 * have not changed. 7047 * 7048 * @return The inverse of the current matrix of this view. 7049 */ 7050 final Matrix getInverseMatrix() { 7051 final TransformationInfo info = mTransformationInfo; 7052 if (info != null) { 7053 updateMatrix(); 7054 if (info.mInverseMatrixDirty) { 7055 if (info.mInverseMatrix == null) { 7056 info.mInverseMatrix = new Matrix(); 7057 } 7058 info.mMatrix.invert(info.mInverseMatrix); 7059 info.mInverseMatrixDirty = false; 7060 } 7061 return info.mInverseMatrix; 7062 } 7063 return Matrix.IDENTITY_MATRIX; 7064 } 7065 7066 /** 7067 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 7068 * views are drawn) from the camera to this view. The camera's distance 7069 * affects 3D transformations, for instance rotations around the X and Y 7070 * axis. If the rotationX or rotationY properties are changed and this view is 7071 * large (more than half the size of the screen), it is recommended to always 7072 * use a camera distance that's greater than the height (X axis rotation) or 7073 * the width (Y axis rotation) of this view.</p> 7074 * 7075 * <p>The distance of the camera from the view plane can have an affect on the 7076 * perspective distortion of the view when it is rotated around the x or y axis. 7077 * For example, a large distance will result in a large viewing angle, and there 7078 * will not be much perspective distortion of the view as it rotates. A short 7079 * distance may cause much more perspective distortion upon rotation, and can 7080 * also result in some drawing artifacts if the rotated view ends up partially 7081 * behind the camera (which is why the recommendation is to use a distance at 7082 * least as far as the size of the view, if the view is to be rotated.)</p> 7083 * 7084 * <p>The distance is expressed in "depth pixels." The default distance depends 7085 * on the screen density. For instance, on a medium density display, the 7086 * default distance is 1280. On a high density display, the default distance 7087 * is 1920.</p> 7088 * 7089 * <p>If you want to specify a distance that leads to visually consistent 7090 * results across various densities, use the following formula:</p> 7091 * <pre> 7092 * float scale = context.getResources().getDisplayMetrics().density; 7093 * view.setCameraDistance(distance * scale); 7094 * </pre> 7095 * 7096 * <p>The density scale factor of a high density display is 1.5, 7097 * and 1920 = 1280 * 1.5.</p> 7098 * 7099 * @param distance The distance in "depth pixels", if negative the opposite 7100 * value is used 7101 * 7102 * @see #setRotationX(float) 7103 * @see #setRotationY(float) 7104 */ 7105 public void setCameraDistance(float distance) { 7106 invalidateParentCaches(); 7107 invalidate(false); 7108 7109 ensureTransformationInfo(); 7110 final float dpi = mResources.getDisplayMetrics().densityDpi; 7111 final TransformationInfo info = mTransformationInfo; 7112 if (info.mCamera == null) { 7113 info.mCamera = new Camera(); 7114 info.matrix3D = new Matrix(); 7115 } 7116 7117 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 7118 info.mMatrixDirty = true; 7119 7120 invalidate(false); 7121 } 7122 7123 /** 7124 * The degrees that the view is rotated around the pivot point. 7125 * 7126 * @see #setRotation(float) 7127 * @see #getPivotX() 7128 * @see #getPivotY() 7129 * 7130 * @return The degrees of rotation. 7131 */ 7132 public float getRotation() { 7133 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 7134 } 7135 7136 /** 7137 * Sets the degrees that the view is rotated around the pivot point. Increasing values 7138 * result in clockwise rotation. 7139 * 7140 * @param rotation The degrees of rotation. 7141 * 7142 * @see #getRotation() 7143 * @see #getPivotX() 7144 * @see #getPivotY() 7145 * @see #setRotationX(float) 7146 * @see #setRotationY(float) 7147 * 7148 * @attr ref android.R.styleable#View_rotation 7149 */ 7150 public void setRotation(float rotation) { 7151 ensureTransformationInfo(); 7152 final TransformationInfo info = mTransformationInfo; 7153 if (info.mRotation != rotation) { 7154 invalidateParentCaches(); 7155 // Double-invalidation is necessary to capture view's old and new areas 7156 invalidate(false); 7157 info.mRotation = rotation; 7158 info.mMatrixDirty = true; 7159 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7160 invalidate(false); 7161 } 7162 } 7163 7164 /** 7165 * The degrees that the view is rotated around the vertical axis through the pivot point. 7166 * 7167 * @see #getPivotX() 7168 * @see #getPivotY() 7169 * @see #setRotationY(float) 7170 * 7171 * @return The degrees of Y rotation. 7172 */ 7173 public float getRotationY() { 7174 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 7175 } 7176 7177 /** 7178 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 7179 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 7180 * down the y axis. 7181 * 7182 * When rotating large views, it is recommended to adjust the camera distance 7183 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7184 * 7185 * @param rotationY The degrees of Y rotation. 7186 * 7187 * @see #getRotationY() 7188 * @see #getPivotX() 7189 * @see #getPivotY() 7190 * @see #setRotation(float) 7191 * @see #setRotationX(float) 7192 * @see #setCameraDistance(float) 7193 * 7194 * @attr ref android.R.styleable#View_rotationY 7195 */ 7196 public void setRotationY(float rotationY) { 7197 ensureTransformationInfo(); 7198 final TransformationInfo info = mTransformationInfo; 7199 if (info.mRotationY != rotationY) { 7200 invalidateParentCaches(); 7201 // Double-invalidation is necessary to capture view's old and new areas 7202 invalidate(false); 7203 info.mRotationY = rotationY; 7204 info.mMatrixDirty = true; 7205 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7206 invalidate(false); 7207 } 7208 } 7209 7210 /** 7211 * The degrees that the view is rotated around the horizontal axis through the pivot point. 7212 * 7213 * @see #getPivotX() 7214 * @see #getPivotY() 7215 * @see #setRotationX(float) 7216 * 7217 * @return The degrees of X rotation. 7218 */ 7219 public float getRotationX() { 7220 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 7221 } 7222 7223 /** 7224 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 7225 * Increasing values result in clockwise rotation from the viewpoint of looking down the 7226 * x axis. 7227 * 7228 * When rotating large views, it is recommended to adjust the camera distance 7229 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7230 * 7231 * @param rotationX The degrees of X rotation. 7232 * 7233 * @see #getRotationX() 7234 * @see #getPivotX() 7235 * @see #getPivotY() 7236 * @see #setRotation(float) 7237 * @see #setRotationY(float) 7238 * @see #setCameraDistance(float) 7239 * 7240 * @attr ref android.R.styleable#View_rotationX 7241 */ 7242 public void setRotationX(float rotationX) { 7243 ensureTransformationInfo(); 7244 final TransformationInfo info = mTransformationInfo; 7245 if (info.mRotationX != rotationX) { 7246 invalidateParentCaches(); 7247 // Double-invalidation is necessary to capture view's old and new areas 7248 invalidate(false); 7249 info.mRotationX = rotationX; 7250 info.mMatrixDirty = true; 7251 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7252 invalidate(false); 7253 } 7254 } 7255 7256 /** 7257 * The amount that the view is scaled in x around the pivot point, as a proportion of 7258 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 7259 * 7260 * <p>By default, this is 1.0f. 7261 * 7262 * @see #getPivotX() 7263 * @see #getPivotY() 7264 * @return The scaling factor. 7265 */ 7266 public float getScaleX() { 7267 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 7268 } 7269 7270 /** 7271 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 7272 * the view's unscaled width. A value of 1 means that no scaling is applied. 7273 * 7274 * @param scaleX The scaling factor. 7275 * @see #getPivotX() 7276 * @see #getPivotY() 7277 * 7278 * @attr ref android.R.styleable#View_scaleX 7279 */ 7280 public void setScaleX(float scaleX) { 7281 ensureTransformationInfo(); 7282 final TransformationInfo info = mTransformationInfo; 7283 if (info.mScaleX != scaleX) { 7284 invalidateParentCaches(); 7285 // Double-invalidation is necessary to capture view's old and new areas 7286 invalidate(false); 7287 info.mScaleX = scaleX; 7288 info.mMatrixDirty = true; 7289 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7290 invalidate(false); 7291 } 7292 } 7293 7294 /** 7295 * The amount that the view is scaled in y around the pivot point, as a proportion of 7296 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 7297 * 7298 * <p>By default, this is 1.0f. 7299 * 7300 * @see #getPivotX() 7301 * @see #getPivotY() 7302 * @return The scaling factor. 7303 */ 7304 public float getScaleY() { 7305 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 7306 } 7307 7308 /** 7309 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 7310 * the view's unscaled width. A value of 1 means that no scaling is applied. 7311 * 7312 * @param scaleY The scaling factor. 7313 * @see #getPivotX() 7314 * @see #getPivotY() 7315 * 7316 * @attr ref android.R.styleable#View_scaleY 7317 */ 7318 public void setScaleY(float scaleY) { 7319 ensureTransformationInfo(); 7320 final TransformationInfo info = mTransformationInfo; 7321 if (info.mScaleY != scaleY) { 7322 invalidateParentCaches(); 7323 // Double-invalidation is necessary to capture view's old and new areas 7324 invalidate(false); 7325 info.mScaleY = scaleY; 7326 info.mMatrixDirty = true; 7327 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7328 invalidate(false); 7329 } 7330 } 7331 7332 /** 7333 * The x location of the point around which the view is {@link #setRotation(float) rotated} 7334 * and {@link #setScaleX(float) scaled}. 7335 * 7336 * @see #getRotation() 7337 * @see #getScaleX() 7338 * @see #getScaleY() 7339 * @see #getPivotY() 7340 * @return The x location of the pivot point. 7341 */ 7342 public float getPivotX() { 7343 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 7344 } 7345 7346 /** 7347 * Sets the x location of the point around which the view is 7348 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 7349 * By default, the pivot point is centered on the object. 7350 * Setting this property disables this behavior and causes the view to use only the 7351 * explicitly set pivotX and pivotY values. 7352 * 7353 * @param pivotX The x location of the pivot point. 7354 * @see #getRotation() 7355 * @see #getScaleX() 7356 * @see #getScaleY() 7357 * @see #getPivotY() 7358 * 7359 * @attr ref android.R.styleable#View_transformPivotX 7360 */ 7361 public void setPivotX(float pivotX) { 7362 ensureTransformationInfo(); 7363 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7364 final TransformationInfo info = mTransformationInfo; 7365 if (info.mPivotX != pivotX) { 7366 invalidateParentCaches(); 7367 // Double-invalidation is necessary to capture view's old and new areas 7368 invalidate(false); 7369 info.mPivotX = pivotX; 7370 info.mMatrixDirty = true; 7371 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7372 invalidate(false); 7373 } 7374 } 7375 7376 /** 7377 * The y location of the point around which the view is {@link #setRotation(float) rotated} 7378 * and {@link #setScaleY(float) scaled}. 7379 * 7380 * @see #getRotation() 7381 * @see #getScaleX() 7382 * @see #getScaleY() 7383 * @see #getPivotY() 7384 * @return The y location of the pivot point. 7385 */ 7386 public float getPivotY() { 7387 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 7388 } 7389 7390 /** 7391 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 7392 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 7393 * Setting this property disables this behavior and causes the view to use only the 7394 * explicitly set pivotX and pivotY values. 7395 * 7396 * @param pivotY The y location of the pivot point. 7397 * @see #getRotation() 7398 * @see #getScaleX() 7399 * @see #getScaleY() 7400 * @see #getPivotY() 7401 * 7402 * @attr ref android.R.styleable#View_transformPivotY 7403 */ 7404 public void setPivotY(float pivotY) { 7405 ensureTransformationInfo(); 7406 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7407 final TransformationInfo info = mTransformationInfo; 7408 if (info.mPivotY != pivotY) { 7409 invalidateParentCaches(); 7410 // Double-invalidation is necessary to capture view's old and new areas 7411 invalidate(false); 7412 info.mPivotY = pivotY; 7413 info.mMatrixDirty = true; 7414 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7415 invalidate(false); 7416 } 7417 } 7418 7419 /** 7420 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 7421 * completely transparent and 1 means the view is completely opaque. 7422 * 7423 * <p>By default this is 1.0f. 7424 * @return The opacity of the view. 7425 */ 7426 public float getAlpha() { 7427 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 7428 } 7429 7430 /** 7431 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 7432 * completely transparent and 1 means the view is completely opaque.</p> 7433 * 7434 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 7435 * responsible for applying the opacity itself. Otherwise, calling this method is 7436 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 7437 * setting a hardware layer.</p> 7438 * 7439 * @param alpha The opacity of the view. 7440 * 7441 * @see #setLayerType(int, android.graphics.Paint) 7442 * 7443 * @attr ref android.R.styleable#View_alpha 7444 */ 7445 public void setAlpha(float alpha) { 7446 ensureTransformationInfo(); 7447 mTransformationInfo.mAlpha = alpha; 7448 invalidateParentCaches(); 7449 if (onSetAlpha((int) (alpha * 255))) { 7450 mPrivateFlags |= ALPHA_SET; 7451 // subclass is handling alpha - don't optimize rendering cache invalidation 7452 invalidate(true); 7453 } else { 7454 mPrivateFlags &= ~ALPHA_SET; 7455 invalidate(false); 7456 } 7457 } 7458 7459 /** 7460 * Faster version of setAlpha() which performs the same steps except there are 7461 * no calls to invalidate(). The caller of this function should perform proper invalidation 7462 * on the parent and this object. The return value indicates whether the subclass handles 7463 * alpha (the return value for onSetAlpha()). 7464 * 7465 * @param alpha The new value for the alpha property 7466 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) 7467 */ 7468 boolean setAlphaNoInvalidation(float alpha) { 7469 ensureTransformationInfo(); 7470 mTransformationInfo.mAlpha = alpha; 7471 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 7472 if (subclassHandlesAlpha) { 7473 mPrivateFlags |= ALPHA_SET; 7474 } else { 7475 mPrivateFlags &= ~ALPHA_SET; 7476 } 7477 return subclassHandlesAlpha; 7478 } 7479 7480 /** 7481 * Top position of this view relative to its parent. 7482 * 7483 * @return The top of this view, in pixels. 7484 */ 7485 @ViewDebug.CapturedViewProperty 7486 public final int getTop() { 7487 return mTop; 7488 } 7489 7490 /** 7491 * Sets the top position of this view relative to its parent. This method is meant to be called 7492 * by the layout system and should not generally be called otherwise, because the property 7493 * may be changed at any time by the layout. 7494 * 7495 * @param top The top of this view, in pixels. 7496 */ 7497 public final void setTop(int top) { 7498 if (top != mTop) { 7499 updateMatrix(); 7500 final boolean matrixIsIdentity = mTransformationInfo == null 7501 || mTransformationInfo.mMatrixIsIdentity; 7502 if (matrixIsIdentity) { 7503 if (mAttachInfo != null) { 7504 int minTop; 7505 int yLoc; 7506 if (top < mTop) { 7507 minTop = top; 7508 yLoc = top - mTop; 7509 } else { 7510 minTop = mTop; 7511 yLoc = 0; 7512 } 7513 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 7514 } 7515 } else { 7516 // Double-invalidation is necessary to capture view's old and new areas 7517 invalidate(true); 7518 } 7519 7520 int width = mRight - mLeft; 7521 int oldHeight = mBottom - mTop; 7522 7523 mTop = top; 7524 7525 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7526 7527 if (!matrixIsIdentity) { 7528 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7529 // A change in dimension means an auto-centered pivot point changes, too 7530 mTransformationInfo.mMatrixDirty = true; 7531 } 7532 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7533 invalidate(true); 7534 } 7535 mBackgroundSizeChanged = true; 7536 invalidateParentIfNeeded(); 7537 } 7538 } 7539 7540 /** 7541 * Bottom position of this view relative to its parent. 7542 * 7543 * @return The bottom of this view, in pixels. 7544 */ 7545 @ViewDebug.CapturedViewProperty 7546 public final int getBottom() { 7547 return mBottom; 7548 } 7549 7550 /** 7551 * True if this view has changed since the last time being drawn. 7552 * 7553 * @return The dirty state of this view. 7554 */ 7555 public boolean isDirty() { 7556 return (mPrivateFlags & DIRTY_MASK) != 0; 7557 } 7558 7559 /** 7560 * Sets the bottom position of this view relative to its parent. This method is meant to be 7561 * called by the layout system and should not generally be called otherwise, because the 7562 * property may be changed at any time by the layout. 7563 * 7564 * @param bottom The bottom of this view, in pixels. 7565 */ 7566 public final void setBottom(int bottom) { 7567 if (bottom != mBottom) { 7568 updateMatrix(); 7569 final boolean matrixIsIdentity = mTransformationInfo == null 7570 || mTransformationInfo.mMatrixIsIdentity; 7571 if (matrixIsIdentity) { 7572 if (mAttachInfo != null) { 7573 int maxBottom; 7574 if (bottom < mBottom) { 7575 maxBottom = mBottom; 7576 } else { 7577 maxBottom = bottom; 7578 } 7579 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 7580 } 7581 } else { 7582 // Double-invalidation is necessary to capture view's old and new areas 7583 invalidate(true); 7584 } 7585 7586 int width = mRight - mLeft; 7587 int oldHeight = mBottom - mTop; 7588 7589 mBottom = bottom; 7590 7591 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7592 7593 if (!matrixIsIdentity) { 7594 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7595 // A change in dimension means an auto-centered pivot point changes, too 7596 mTransformationInfo.mMatrixDirty = true; 7597 } 7598 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7599 invalidate(true); 7600 } 7601 mBackgroundSizeChanged = true; 7602 invalidateParentIfNeeded(); 7603 } 7604 } 7605 7606 /** 7607 * Left position of this view relative to its parent. 7608 * 7609 * @return The left edge of this view, in pixels. 7610 */ 7611 @ViewDebug.CapturedViewProperty 7612 public final int getLeft() { 7613 return mLeft; 7614 } 7615 7616 /** 7617 * Sets the left position of this view relative to its parent. This method is meant to be called 7618 * by the layout system and should not generally be called otherwise, because the property 7619 * may be changed at any time by the layout. 7620 * 7621 * @param left The bottom of this view, in pixels. 7622 */ 7623 public final void setLeft(int left) { 7624 if (left != mLeft) { 7625 updateMatrix(); 7626 final boolean matrixIsIdentity = mTransformationInfo == null 7627 || mTransformationInfo.mMatrixIsIdentity; 7628 if (matrixIsIdentity) { 7629 if (mAttachInfo != null) { 7630 int minLeft; 7631 int xLoc; 7632 if (left < mLeft) { 7633 minLeft = left; 7634 xLoc = left - mLeft; 7635 } else { 7636 minLeft = mLeft; 7637 xLoc = 0; 7638 } 7639 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7640 } 7641 } else { 7642 // Double-invalidation is necessary to capture view's old and new areas 7643 invalidate(true); 7644 } 7645 7646 int oldWidth = mRight - mLeft; 7647 int height = mBottom - mTop; 7648 7649 mLeft = left; 7650 7651 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7652 7653 if (!matrixIsIdentity) { 7654 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7655 // A change in dimension means an auto-centered pivot point changes, too 7656 mTransformationInfo.mMatrixDirty = true; 7657 } 7658 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7659 invalidate(true); 7660 } 7661 mBackgroundSizeChanged = true; 7662 invalidateParentIfNeeded(); 7663 } 7664 } 7665 7666 /** 7667 * Right position of this view relative to its parent. 7668 * 7669 * @return The right edge of this view, in pixels. 7670 */ 7671 @ViewDebug.CapturedViewProperty 7672 public final int getRight() { 7673 return mRight; 7674 } 7675 7676 /** 7677 * Sets the right position of this view relative to its parent. This method is meant to be called 7678 * by the layout system and should not generally be called otherwise, because the property 7679 * may be changed at any time by the layout. 7680 * 7681 * @param right The bottom of this view, in pixels. 7682 */ 7683 public final void setRight(int right) { 7684 if (right != mRight) { 7685 updateMatrix(); 7686 final boolean matrixIsIdentity = mTransformationInfo == null 7687 || mTransformationInfo.mMatrixIsIdentity; 7688 if (matrixIsIdentity) { 7689 if (mAttachInfo != null) { 7690 int maxRight; 7691 if (right < mRight) { 7692 maxRight = mRight; 7693 } else { 7694 maxRight = right; 7695 } 7696 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7697 } 7698 } else { 7699 // Double-invalidation is necessary to capture view's old and new areas 7700 invalidate(true); 7701 } 7702 7703 int oldWidth = mRight - mLeft; 7704 int height = mBottom - mTop; 7705 7706 mRight = right; 7707 7708 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7709 7710 if (!matrixIsIdentity) { 7711 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7712 // A change in dimension means an auto-centered pivot point changes, too 7713 mTransformationInfo.mMatrixDirty = true; 7714 } 7715 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7716 invalidate(true); 7717 } 7718 mBackgroundSizeChanged = true; 7719 invalidateParentIfNeeded(); 7720 } 7721 } 7722 7723 /** 7724 * The visual x position of this view, in pixels. This is equivalent to the 7725 * {@link #setTranslationX(float) translationX} property plus the current 7726 * {@link #getLeft() left} property. 7727 * 7728 * @return The visual x position of this view, in pixels. 7729 */ 7730 public float getX() { 7731 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 7732 } 7733 7734 /** 7735 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 7736 * {@link #setTranslationX(float) translationX} property to be the difference between 7737 * the x value passed in and the current {@link #getLeft() left} property. 7738 * 7739 * @param x The visual x position of this view, in pixels. 7740 */ 7741 public void setX(float x) { 7742 setTranslationX(x - mLeft); 7743 } 7744 7745 /** 7746 * The visual y position of this view, in pixels. This is equivalent to the 7747 * {@link #setTranslationY(float) translationY} property plus the current 7748 * {@link #getTop() top} property. 7749 * 7750 * @return The visual y position of this view, in pixels. 7751 */ 7752 public float getY() { 7753 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 7754 } 7755 7756 /** 7757 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 7758 * {@link #setTranslationY(float) translationY} property to be the difference between 7759 * the y value passed in and the current {@link #getTop() top} property. 7760 * 7761 * @param y The visual y position of this view, in pixels. 7762 */ 7763 public void setY(float y) { 7764 setTranslationY(y - mTop); 7765 } 7766 7767 7768 /** 7769 * The horizontal location of this view relative to its {@link #getLeft() left} position. 7770 * This position is post-layout, in addition to wherever the object's 7771 * layout placed it. 7772 * 7773 * @return The horizontal position of this view relative to its left position, in pixels. 7774 */ 7775 public float getTranslationX() { 7776 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 7777 } 7778 7779 /** 7780 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 7781 * This effectively positions the object post-layout, in addition to wherever the object's 7782 * layout placed it. 7783 * 7784 * @param translationX The horizontal position of this view relative to its left position, 7785 * in pixels. 7786 * 7787 * @attr ref android.R.styleable#View_translationX 7788 */ 7789 public void setTranslationX(float translationX) { 7790 ensureTransformationInfo(); 7791 final TransformationInfo info = mTransformationInfo; 7792 if (info.mTranslationX != translationX) { 7793 invalidateParentCaches(); 7794 // Double-invalidation is necessary to capture view's old and new areas 7795 invalidate(false); 7796 info.mTranslationX = translationX; 7797 info.mMatrixDirty = true; 7798 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7799 invalidate(false); 7800 } 7801 } 7802 7803 /** 7804 * The horizontal location of this view relative to its {@link #getTop() top} position. 7805 * This position is post-layout, in addition to wherever the object's 7806 * layout placed it. 7807 * 7808 * @return The vertical position of this view relative to its top position, 7809 * in pixels. 7810 */ 7811 public float getTranslationY() { 7812 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 7813 } 7814 7815 /** 7816 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 7817 * This effectively positions the object post-layout, in addition to wherever the object's 7818 * layout placed it. 7819 * 7820 * @param translationY The vertical position of this view relative to its top position, 7821 * in pixels. 7822 * 7823 * @attr ref android.R.styleable#View_translationY 7824 */ 7825 public void setTranslationY(float translationY) { 7826 ensureTransformationInfo(); 7827 final TransformationInfo info = mTransformationInfo; 7828 if (info.mTranslationY != translationY) { 7829 invalidateParentCaches(); 7830 // Double-invalidation is necessary to capture view's old and new areas 7831 invalidate(false); 7832 info.mTranslationY = translationY; 7833 info.mMatrixDirty = true; 7834 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7835 invalidate(false); 7836 } 7837 } 7838 7839 /** 7840 * @hide 7841 */ 7842 public void setFastTranslationX(float x) { 7843 ensureTransformationInfo(); 7844 final TransformationInfo info = mTransformationInfo; 7845 info.mTranslationX = x; 7846 info.mMatrixDirty = true; 7847 } 7848 7849 /** 7850 * @hide 7851 */ 7852 public void setFastTranslationY(float y) { 7853 ensureTransformationInfo(); 7854 final TransformationInfo info = mTransformationInfo; 7855 info.mTranslationY = y; 7856 info.mMatrixDirty = true; 7857 } 7858 7859 /** 7860 * @hide 7861 */ 7862 public void setFastX(float x) { 7863 ensureTransformationInfo(); 7864 final TransformationInfo info = mTransformationInfo; 7865 info.mTranslationX = x - mLeft; 7866 info.mMatrixDirty = true; 7867 } 7868 7869 /** 7870 * @hide 7871 */ 7872 public void setFastY(float y) { 7873 ensureTransformationInfo(); 7874 final TransformationInfo info = mTransformationInfo; 7875 info.mTranslationY = y - mTop; 7876 info.mMatrixDirty = true; 7877 } 7878 7879 /** 7880 * @hide 7881 */ 7882 public void setFastScaleX(float x) { 7883 ensureTransformationInfo(); 7884 final TransformationInfo info = mTransformationInfo; 7885 info.mScaleX = x; 7886 info.mMatrixDirty = true; 7887 } 7888 7889 /** 7890 * @hide 7891 */ 7892 public void setFastScaleY(float y) { 7893 ensureTransformationInfo(); 7894 final TransformationInfo info = mTransformationInfo; 7895 info.mScaleY = y; 7896 info.mMatrixDirty = true; 7897 } 7898 7899 /** 7900 * @hide 7901 */ 7902 public void setFastAlpha(float alpha) { 7903 ensureTransformationInfo(); 7904 mTransformationInfo.mAlpha = alpha; 7905 } 7906 7907 /** 7908 * @hide 7909 */ 7910 public void setFastRotationY(float y) { 7911 ensureTransformationInfo(); 7912 final TransformationInfo info = mTransformationInfo; 7913 info.mRotationY = y; 7914 info.mMatrixDirty = true; 7915 } 7916 7917 /** 7918 * Hit rectangle in parent's coordinates 7919 * 7920 * @param outRect The hit rectangle of the view. 7921 */ 7922 public void getHitRect(Rect outRect) { 7923 updateMatrix(); 7924 final TransformationInfo info = mTransformationInfo; 7925 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 7926 outRect.set(mLeft, mTop, mRight, mBottom); 7927 } else { 7928 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 7929 tmpRect.set(-info.mPivotX, -info.mPivotY, 7930 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 7931 info.mMatrix.mapRect(tmpRect); 7932 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 7933 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 7934 } 7935 } 7936 7937 /** 7938 * Determines whether the given point, in local coordinates is inside the view. 7939 */ 7940 /*package*/ final boolean pointInView(float localX, float localY) { 7941 return localX >= 0 && localX < (mRight - mLeft) 7942 && localY >= 0 && localY < (mBottom - mTop); 7943 } 7944 7945 /** 7946 * Utility method to determine whether the given point, in local coordinates, 7947 * is inside the view, where the area of the view is expanded by the slop factor. 7948 * This method is called while processing touch-move events to determine if the event 7949 * is still within the view. 7950 */ 7951 private boolean pointInView(float localX, float localY, float slop) { 7952 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 7953 localY < ((mBottom - mTop) + slop); 7954 } 7955 7956 /** 7957 * When a view has focus and the user navigates away from it, the next view is searched for 7958 * starting from the rectangle filled in by this method. 7959 * 7960 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 7961 * of the view. However, if your view maintains some idea of internal selection, 7962 * such as a cursor, or a selected row or column, you should override this method and 7963 * fill in a more specific rectangle. 7964 * 7965 * @param r The rectangle to fill in, in this view's coordinates. 7966 */ 7967 public void getFocusedRect(Rect r) { 7968 getDrawingRect(r); 7969 } 7970 7971 /** 7972 * If some part of this view is not clipped by any of its parents, then 7973 * return that area in r in global (root) coordinates. To convert r to local 7974 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 7975 * -globalOffset.y)) If the view is completely clipped or translated out, 7976 * return false. 7977 * 7978 * @param r If true is returned, r holds the global coordinates of the 7979 * visible portion of this view. 7980 * @param globalOffset If true is returned, globalOffset holds the dx,dy 7981 * between this view and its root. globalOffet may be null. 7982 * @return true if r is non-empty (i.e. part of the view is visible at the 7983 * root level. 7984 */ 7985 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 7986 int width = mRight - mLeft; 7987 int height = mBottom - mTop; 7988 if (width > 0 && height > 0) { 7989 r.set(0, 0, width, height); 7990 if (globalOffset != null) { 7991 globalOffset.set(-mScrollX, -mScrollY); 7992 } 7993 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 7994 } 7995 return false; 7996 } 7997 7998 public final boolean getGlobalVisibleRect(Rect r) { 7999 return getGlobalVisibleRect(r, null); 8000 } 8001 8002 public final boolean getLocalVisibleRect(Rect r) { 8003 Point offset = new Point(); 8004 if (getGlobalVisibleRect(r, offset)) { 8005 r.offset(-offset.x, -offset.y); // make r local 8006 return true; 8007 } 8008 return false; 8009 } 8010 8011 /** 8012 * Offset this view's vertical location by the specified number of pixels. 8013 * 8014 * @param offset the number of pixels to offset the view by 8015 */ 8016 public void offsetTopAndBottom(int offset) { 8017 if (offset != 0) { 8018 updateMatrix(); 8019 final boolean matrixIsIdentity = mTransformationInfo == null 8020 || mTransformationInfo.mMatrixIsIdentity; 8021 if (matrixIsIdentity) { 8022 final ViewParent p = mParent; 8023 if (p != null && mAttachInfo != null) { 8024 final Rect r = mAttachInfo.mTmpInvalRect; 8025 int minTop; 8026 int maxBottom; 8027 int yLoc; 8028 if (offset < 0) { 8029 minTop = mTop + offset; 8030 maxBottom = mBottom; 8031 yLoc = offset; 8032 } else { 8033 minTop = mTop; 8034 maxBottom = mBottom + offset; 8035 yLoc = 0; 8036 } 8037 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 8038 p.invalidateChild(this, r); 8039 } 8040 } else { 8041 invalidate(false); 8042 } 8043 8044 mTop += offset; 8045 mBottom += offset; 8046 8047 if (!matrixIsIdentity) { 8048 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8049 invalidate(false); 8050 } 8051 invalidateParentIfNeeded(); 8052 } 8053 } 8054 8055 /** 8056 * Offset this view's horizontal location by the specified amount of pixels. 8057 * 8058 * @param offset the numer of pixels to offset the view by 8059 */ 8060 public void offsetLeftAndRight(int offset) { 8061 if (offset != 0) { 8062 updateMatrix(); 8063 final boolean matrixIsIdentity = mTransformationInfo == null 8064 || mTransformationInfo.mMatrixIsIdentity; 8065 if (matrixIsIdentity) { 8066 final ViewParent p = mParent; 8067 if (p != null && mAttachInfo != null) { 8068 final Rect r = mAttachInfo.mTmpInvalRect; 8069 int minLeft; 8070 int maxRight; 8071 if (offset < 0) { 8072 minLeft = mLeft + offset; 8073 maxRight = mRight; 8074 } else { 8075 minLeft = mLeft; 8076 maxRight = mRight + offset; 8077 } 8078 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 8079 p.invalidateChild(this, r); 8080 } 8081 } else { 8082 invalidate(false); 8083 } 8084 8085 mLeft += offset; 8086 mRight += offset; 8087 8088 if (!matrixIsIdentity) { 8089 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8090 invalidate(false); 8091 } 8092 invalidateParentIfNeeded(); 8093 } 8094 } 8095 8096 /** 8097 * Get the LayoutParams associated with this view. All views should have 8098 * layout parameters. These supply parameters to the <i>parent</i> of this 8099 * view specifying how it should be arranged. There are many subclasses of 8100 * ViewGroup.LayoutParams, and these correspond to the different subclasses 8101 * of ViewGroup that are responsible for arranging their children. 8102 * 8103 * This method may return null if this View is not attached to a parent 8104 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 8105 * was not invoked successfully. When a View is attached to a parent 8106 * ViewGroup, this method must not return null. 8107 * 8108 * @return The LayoutParams associated with this view, or null if no 8109 * parameters have been set yet 8110 */ 8111 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 8112 public ViewGroup.LayoutParams getLayoutParams() { 8113 return mLayoutParams; 8114 } 8115 8116 /** 8117 * Set the layout parameters associated with this view. These supply 8118 * parameters to the <i>parent</i> of this view specifying how it should be 8119 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 8120 * correspond to the different subclasses of ViewGroup that are responsible 8121 * for arranging their children. 8122 * 8123 * @param params The layout parameters for this view, cannot be null 8124 */ 8125 public void setLayoutParams(ViewGroup.LayoutParams params) { 8126 if (params == null) { 8127 throw new NullPointerException("Layout parameters cannot be null"); 8128 } 8129 mLayoutParams = params; 8130 requestLayout(); 8131 } 8132 8133 /** 8134 * Set the scrolled position of your view. This will cause a call to 8135 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8136 * invalidated. 8137 * @param x the x position to scroll to 8138 * @param y the y position to scroll to 8139 */ 8140 public void scrollTo(int x, int y) { 8141 if (mScrollX != x || mScrollY != y) { 8142 int oldX = mScrollX; 8143 int oldY = mScrollY; 8144 mScrollX = x; 8145 mScrollY = y; 8146 invalidateParentCaches(); 8147 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 8148 if (!awakenScrollBars()) { 8149 invalidate(true); 8150 } 8151 } 8152 } 8153 8154 /** 8155 * Move the scrolled position of your view. This will cause a call to 8156 * {@link #onScrollChanged(int, int, int, int)} and the view will be 8157 * invalidated. 8158 * @param x the amount of pixels to scroll by horizontally 8159 * @param y the amount of pixels to scroll by vertically 8160 */ 8161 public void scrollBy(int x, int y) { 8162 scrollTo(mScrollX + x, mScrollY + y); 8163 } 8164 8165 /** 8166 * <p>Trigger the scrollbars to draw. When invoked this method starts an 8167 * animation to fade the scrollbars out after a default delay. If a subclass 8168 * provides animated scrolling, the start delay should equal the duration 8169 * of the scrolling animation.</p> 8170 * 8171 * <p>The animation starts only if at least one of the scrollbars is 8172 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 8173 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8174 * this method returns true, and false otherwise. If the animation is 8175 * started, this method calls {@link #invalidate()}; in that case the 8176 * caller should not call {@link #invalidate()}.</p> 8177 * 8178 * <p>This method should be invoked every time a subclass directly updates 8179 * the scroll parameters.</p> 8180 * 8181 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 8182 * and {@link #scrollTo(int, int)}.</p> 8183 * 8184 * @return true if the animation is played, false otherwise 8185 * 8186 * @see #awakenScrollBars(int) 8187 * @see #scrollBy(int, int) 8188 * @see #scrollTo(int, int) 8189 * @see #isHorizontalScrollBarEnabled() 8190 * @see #isVerticalScrollBarEnabled() 8191 * @see #setHorizontalScrollBarEnabled(boolean) 8192 * @see #setVerticalScrollBarEnabled(boolean) 8193 */ 8194 protected boolean awakenScrollBars() { 8195 return mScrollCache != null && 8196 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 8197 } 8198 8199 /** 8200 * Trigger the scrollbars to draw. 8201 * This method differs from awakenScrollBars() only in its default duration. 8202 * initialAwakenScrollBars() will show the scroll bars for longer than 8203 * usual to give the user more of a chance to notice them. 8204 * 8205 * @return true if the animation is played, false otherwise. 8206 */ 8207 private boolean initialAwakenScrollBars() { 8208 return mScrollCache != null && 8209 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 8210 } 8211 8212 /** 8213 * <p> 8214 * Trigger the scrollbars to draw. When invoked this method starts an 8215 * animation to fade the scrollbars out after a fixed delay. If a subclass 8216 * provides animated scrolling, the start delay should equal the duration of 8217 * the scrolling animation. 8218 * </p> 8219 * 8220 * <p> 8221 * The animation starts only if at least one of the scrollbars is enabled, 8222 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8223 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8224 * this method returns true, and false otherwise. If the animation is 8225 * started, this method calls {@link #invalidate()}; in that case the caller 8226 * should not call {@link #invalidate()}. 8227 * </p> 8228 * 8229 * <p> 8230 * This method should be invoked everytime a subclass directly updates the 8231 * scroll parameters. 8232 * </p> 8233 * 8234 * @param startDelay the delay, in milliseconds, after which the animation 8235 * should start; when the delay is 0, the animation starts 8236 * immediately 8237 * @return true if the animation is played, false otherwise 8238 * 8239 * @see #scrollBy(int, int) 8240 * @see #scrollTo(int, int) 8241 * @see #isHorizontalScrollBarEnabled() 8242 * @see #isVerticalScrollBarEnabled() 8243 * @see #setHorizontalScrollBarEnabled(boolean) 8244 * @see #setVerticalScrollBarEnabled(boolean) 8245 */ 8246 protected boolean awakenScrollBars(int startDelay) { 8247 return awakenScrollBars(startDelay, true); 8248 } 8249 8250 /** 8251 * <p> 8252 * Trigger the scrollbars to draw. When invoked this method starts an 8253 * animation to fade the scrollbars out after a fixed delay. If a subclass 8254 * provides animated scrolling, the start delay should equal the duration of 8255 * the scrolling animation. 8256 * </p> 8257 * 8258 * <p> 8259 * The animation starts only if at least one of the scrollbars is enabled, 8260 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8261 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8262 * this method returns true, and false otherwise. If the animation is 8263 * started, this method calls {@link #invalidate()} if the invalidate parameter 8264 * is set to true; in that case the caller 8265 * should not call {@link #invalidate()}. 8266 * </p> 8267 * 8268 * <p> 8269 * This method should be invoked everytime a subclass directly updates the 8270 * scroll parameters. 8271 * </p> 8272 * 8273 * @param startDelay the delay, in milliseconds, after which the animation 8274 * should start; when the delay is 0, the animation starts 8275 * immediately 8276 * 8277 * @param invalidate Wheter this method should call invalidate 8278 * 8279 * @return true if the animation is played, false otherwise 8280 * 8281 * @see #scrollBy(int, int) 8282 * @see #scrollTo(int, int) 8283 * @see #isHorizontalScrollBarEnabled() 8284 * @see #isVerticalScrollBarEnabled() 8285 * @see #setHorizontalScrollBarEnabled(boolean) 8286 * @see #setVerticalScrollBarEnabled(boolean) 8287 */ 8288 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 8289 final ScrollabilityCache scrollCache = mScrollCache; 8290 8291 if (scrollCache == null || !scrollCache.fadeScrollBars) { 8292 return false; 8293 } 8294 8295 if (scrollCache.scrollBar == null) { 8296 scrollCache.scrollBar = new ScrollBarDrawable(); 8297 } 8298 8299 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 8300 8301 if (invalidate) { 8302 // Invalidate to show the scrollbars 8303 invalidate(true); 8304 } 8305 8306 if (scrollCache.state == ScrollabilityCache.OFF) { 8307 // FIXME: this is copied from WindowManagerService. 8308 // We should get this value from the system when it 8309 // is possible to do so. 8310 final int KEY_REPEAT_FIRST_DELAY = 750; 8311 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 8312 } 8313 8314 // Tell mScrollCache when we should start fading. This may 8315 // extend the fade start time if one was already scheduled 8316 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 8317 scrollCache.fadeStartTime = fadeStartTime; 8318 scrollCache.state = ScrollabilityCache.ON; 8319 8320 // Schedule our fader to run, unscheduling any old ones first 8321 if (mAttachInfo != null) { 8322 mAttachInfo.mHandler.removeCallbacks(scrollCache); 8323 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 8324 } 8325 8326 return true; 8327 } 8328 8329 return false; 8330 } 8331 8332 /** 8333 * Do not invalidate views which are not visible and which are not running an animation. They 8334 * will not get drawn and they should not set dirty flags as if they will be drawn 8335 */ 8336 private boolean skipInvalidate() { 8337 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 8338 (!(mParent instanceof ViewGroup) || 8339 !((ViewGroup) mParent).isViewTransitioning(this)); 8340 } 8341 /** 8342 * Mark the the area defined by dirty as needing to be drawn. If the view is 8343 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 8344 * in the future. This must be called from a UI thread. To call from a non-UI 8345 * thread, call {@link #postInvalidate()}. 8346 * 8347 * WARNING: This method is destructive to dirty. 8348 * @param dirty the rectangle representing the bounds of the dirty region 8349 */ 8350 public void invalidate(Rect dirty) { 8351 if (ViewDebug.TRACE_HIERARCHY) { 8352 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8353 } 8354 8355 if (skipInvalidate()) { 8356 return; 8357 } 8358 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8359 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8360 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8361 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8362 mPrivateFlags |= INVALIDATED; 8363 mPrivateFlags |= DIRTY; 8364 final ViewParent p = mParent; 8365 final AttachInfo ai = mAttachInfo; 8366 //noinspection PointlessBooleanExpression,ConstantConditions 8367 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8368 if (p != null && ai != null && ai.mHardwareAccelerated) { 8369 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8370 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8371 p.invalidateChild(this, null); 8372 return; 8373 } 8374 } 8375 if (p != null && ai != null) { 8376 final int scrollX = mScrollX; 8377 final int scrollY = mScrollY; 8378 final Rect r = ai.mTmpInvalRect; 8379 r.set(dirty.left - scrollX, dirty.top - scrollY, 8380 dirty.right - scrollX, dirty.bottom - scrollY); 8381 mParent.invalidateChild(this, r); 8382 } 8383 } 8384 } 8385 8386 /** 8387 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 8388 * The coordinates of the dirty rect are relative to the view. 8389 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 8390 * will be called at some point in the future. This must be called from 8391 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 8392 * @param l the left position of the dirty region 8393 * @param t the top position of the dirty region 8394 * @param r the right position of the dirty region 8395 * @param b the bottom position of the dirty region 8396 */ 8397 public void invalidate(int l, int t, int r, int b) { 8398 if (ViewDebug.TRACE_HIERARCHY) { 8399 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8400 } 8401 8402 if (skipInvalidate()) { 8403 return; 8404 } 8405 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8406 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8407 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8408 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8409 mPrivateFlags |= INVALIDATED; 8410 mPrivateFlags |= DIRTY; 8411 final ViewParent p = mParent; 8412 final AttachInfo ai = mAttachInfo; 8413 //noinspection PointlessBooleanExpression,ConstantConditions 8414 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8415 if (p != null && ai != null && ai.mHardwareAccelerated) { 8416 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8417 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8418 p.invalidateChild(this, null); 8419 return; 8420 } 8421 } 8422 if (p != null && ai != null && l < r && t < b) { 8423 final int scrollX = mScrollX; 8424 final int scrollY = mScrollY; 8425 final Rect tmpr = ai.mTmpInvalRect; 8426 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 8427 p.invalidateChild(this, tmpr); 8428 } 8429 } 8430 } 8431 8432 /** 8433 * Invalidate the whole view. If the view is visible, 8434 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 8435 * the future. This must be called from a UI thread. To call from a non-UI thread, 8436 * call {@link #postInvalidate()}. 8437 */ 8438 public void invalidate() { 8439 invalidate(true); 8440 } 8441 8442 /** 8443 * This is where the invalidate() work actually happens. A full invalidate() 8444 * causes the drawing cache to be invalidated, but this function can be called with 8445 * invalidateCache set to false to skip that invalidation step for cases that do not 8446 * need it (for example, a component that remains at the same dimensions with the same 8447 * content). 8448 * 8449 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 8450 * well. This is usually true for a full invalidate, but may be set to false if the 8451 * View's contents or dimensions have not changed. 8452 */ 8453 void invalidate(boolean invalidateCache) { 8454 if (ViewDebug.TRACE_HIERARCHY) { 8455 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8456 } 8457 8458 if (skipInvalidate()) { 8459 return; 8460 } 8461 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8462 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 8463 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 8464 mLastIsOpaque = isOpaque(); 8465 mPrivateFlags &= ~DRAWN; 8466 mPrivateFlags |= DIRTY; 8467 if (invalidateCache) { 8468 mPrivateFlags |= INVALIDATED; 8469 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8470 } 8471 final AttachInfo ai = mAttachInfo; 8472 final ViewParent p = mParent; 8473 //noinspection PointlessBooleanExpression,ConstantConditions 8474 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8475 if (p != null && ai != null && ai.mHardwareAccelerated) { 8476 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8477 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8478 p.invalidateChild(this, null); 8479 return; 8480 } 8481 } 8482 8483 if (p != null && ai != null) { 8484 final Rect r = ai.mTmpInvalRect; 8485 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8486 // Don't call invalidate -- we don't want to internally scroll 8487 // our own bounds 8488 p.invalidateChild(this, r); 8489 } 8490 } 8491 } 8492 8493 /** 8494 * @hide 8495 */ 8496 public void fastInvalidate() { 8497 if (skipInvalidate()) { 8498 return; 8499 } 8500 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8501 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8502 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8503 if (mParent instanceof View) { 8504 ((View) mParent).mPrivateFlags |= INVALIDATED; 8505 } 8506 mPrivateFlags &= ~DRAWN; 8507 mPrivateFlags |= DIRTY; 8508 mPrivateFlags |= INVALIDATED; 8509 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8510 if (mParent != null && mAttachInfo != null) { 8511 if (mAttachInfo.mHardwareAccelerated) { 8512 mParent.invalidateChild(this, null); 8513 } else { 8514 final Rect r = mAttachInfo.mTmpInvalRect; 8515 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8516 // Don't call invalidate -- we don't want to internally scroll 8517 // our own bounds 8518 mParent.invalidateChild(this, r); 8519 } 8520 } 8521 } 8522 } 8523 8524 /** 8525 * Used to indicate that the parent of this view should clear its caches. This functionality 8526 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8527 * which is necessary when various parent-managed properties of the view change, such as 8528 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 8529 * clears the parent caches and does not causes an invalidate event. 8530 * 8531 * @hide 8532 */ 8533 protected void invalidateParentCaches() { 8534 if (mParent instanceof View) { 8535 ((View) mParent).mPrivateFlags |= INVALIDATED; 8536 } 8537 } 8538 8539 /** 8540 * Used to indicate that the parent of this view should be invalidated. This functionality 8541 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8542 * which is necessary when various parent-managed properties of the view change, such as 8543 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 8544 * an invalidation event to the parent. 8545 * 8546 * @hide 8547 */ 8548 protected void invalidateParentIfNeeded() { 8549 if (isHardwareAccelerated() && mParent instanceof View) { 8550 ((View) mParent).invalidate(true); 8551 } 8552 } 8553 8554 /** 8555 * Indicates whether this View is opaque. An opaque View guarantees that it will 8556 * draw all the pixels overlapping its bounds using a fully opaque color. 8557 * 8558 * Subclasses of View should override this method whenever possible to indicate 8559 * whether an instance is opaque. Opaque Views are treated in a special way by 8560 * the View hierarchy, possibly allowing it to perform optimizations during 8561 * invalidate/draw passes. 8562 * 8563 * @return True if this View is guaranteed to be fully opaque, false otherwise. 8564 */ 8565 @ViewDebug.ExportedProperty(category = "drawing") 8566 public boolean isOpaque() { 8567 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 8568 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 8569 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 8570 } 8571 8572 /** 8573 * @hide 8574 */ 8575 protected void computeOpaqueFlags() { 8576 // Opaque if: 8577 // - Has a background 8578 // - Background is opaque 8579 // - Doesn't have scrollbars or scrollbars are inside overlay 8580 8581 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 8582 mPrivateFlags |= OPAQUE_BACKGROUND; 8583 } else { 8584 mPrivateFlags &= ~OPAQUE_BACKGROUND; 8585 } 8586 8587 final int flags = mViewFlags; 8588 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 8589 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 8590 mPrivateFlags |= OPAQUE_SCROLLBARS; 8591 } else { 8592 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 8593 } 8594 } 8595 8596 /** 8597 * @hide 8598 */ 8599 protected boolean hasOpaqueScrollbars() { 8600 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 8601 } 8602 8603 /** 8604 * @return A handler associated with the thread running the View. This 8605 * handler can be used to pump events in the UI events queue. 8606 */ 8607 public Handler getHandler() { 8608 if (mAttachInfo != null) { 8609 return mAttachInfo.mHandler; 8610 } 8611 return null; 8612 } 8613 8614 /** 8615 * <p>Causes the Runnable to be added to the message queue. 8616 * The runnable will be run on the user interface thread.</p> 8617 * 8618 * <p>This method can be invoked from outside of the UI thread 8619 * only when this View is attached to a window.</p> 8620 * 8621 * @param action The Runnable that will be executed. 8622 * 8623 * @return Returns true if the Runnable was successfully placed in to the 8624 * message queue. Returns false on failure, usually because the 8625 * looper processing the message queue is exiting. 8626 */ 8627 public boolean post(Runnable action) { 8628 Handler handler; 8629 AttachInfo attachInfo = mAttachInfo; 8630 if (attachInfo != null) { 8631 handler = attachInfo.mHandler; 8632 } else { 8633 // Assume that post will succeed later 8634 ViewRootImpl.getRunQueue().post(action); 8635 return true; 8636 } 8637 8638 return handler.post(action); 8639 } 8640 8641 /** 8642 * <p>Causes the Runnable to be added to the message queue, to be run 8643 * after the specified amount of time elapses. 8644 * The runnable will be run on the user interface thread.</p> 8645 * 8646 * <p>This method can be invoked from outside of the UI thread 8647 * only when this View is attached to a window.</p> 8648 * 8649 * @param action The Runnable that will be executed. 8650 * @param delayMillis The delay (in milliseconds) until the Runnable 8651 * will be executed. 8652 * 8653 * @return true if the Runnable was successfully placed in to the 8654 * message queue. Returns false on failure, usually because the 8655 * looper processing the message queue is exiting. Note that a 8656 * result of true does not mean the Runnable will be processed -- 8657 * if the looper is quit before the delivery time of the message 8658 * occurs then the message will be dropped. 8659 */ 8660 public boolean postDelayed(Runnable action, long delayMillis) { 8661 Handler handler; 8662 AttachInfo attachInfo = mAttachInfo; 8663 if (attachInfo != null) { 8664 handler = attachInfo.mHandler; 8665 } else { 8666 // Assume that post will succeed later 8667 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8668 return true; 8669 } 8670 8671 return handler.postDelayed(action, delayMillis); 8672 } 8673 8674 /** 8675 * <p>Removes the specified Runnable from the message queue.</p> 8676 * 8677 * <p>This method can be invoked from outside of the UI thread 8678 * only when this View is attached to a window.</p> 8679 * 8680 * @param action The Runnable to remove from the message handling queue 8681 * 8682 * @return true if this view could ask the Handler to remove the Runnable, 8683 * false otherwise. When the returned value is true, the Runnable 8684 * may or may not have been actually removed from the message queue 8685 * (for instance, if the Runnable was not in the queue already.) 8686 */ 8687 public boolean removeCallbacks(Runnable action) { 8688 Handler handler; 8689 AttachInfo attachInfo = mAttachInfo; 8690 if (attachInfo != null) { 8691 handler = attachInfo.mHandler; 8692 } else { 8693 // Assume that post will succeed later 8694 ViewRootImpl.getRunQueue().removeCallbacks(action); 8695 return true; 8696 } 8697 8698 handler.removeCallbacks(action); 8699 return true; 8700 } 8701 8702 /** 8703 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 8704 * Use this to invalidate the View from a non-UI thread.</p> 8705 * 8706 * <p>This method can be invoked from outside of the UI thread 8707 * only when this View is attached to a window.</p> 8708 * 8709 * @see #invalidate() 8710 */ 8711 public void postInvalidate() { 8712 postInvalidateDelayed(0); 8713 } 8714 8715 /** 8716 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8717 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 8718 * 8719 * <p>This method can be invoked from outside of the UI thread 8720 * only when this View is attached to a window.</p> 8721 * 8722 * @param left The left coordinate of the rectangle to invalidate. 8723 * @param top The top coordinate of the rectangle to invalidate. 8724 * @param right The right coordinate of the rectangle to invalidate. 8725 * @param bottom The bottom coordinate of the rectangle to invalidate. 8726 * 8727 * @see #invalidate(int, int, int, int) 8728 * @see #invalidate(Rect) 8729 */ 8730 public void postInvalidate(int left, int top, int right, int bottom) { 8731 postInvalidateDelayed(0, left, top, right, bottom); 8732 } 8733 8734 /** 8735 * <p>Cause an invalidate to happen on a subsequent cycle through the event 8736 * loop. Waits for the specified amount of time.</p> 8737 * 8738 * <p>This method can be invoked from outside of the UI thread 8739 * only when this View is attached to a window.</p> 8740 * 8741 * @param delayMilliseconds the duration in milliseconds to delay the 8742 * invalidation by 8743 */ 8744 public void postInvalidateDelayed(long delayMilliseconds) { 8745 // We try only with the AttachInfo because there's no point in invalidating 8746 // if we are not attached to our window 8747 AttachInfo attachInfo = mAttachInfo; 8748 if (attachInfo != null) { 8749 Message msg = Message.obtain(); 8750 msg.what = AttachInfo.INVALIDATE_MSG; 8751 msg.obj = this; 8752 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8753 } 8754 } 8755 8756 /** 8757 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8758 * through the event loop. Waits for the specified amount of time.</p> 8759 * 8760 * <p>This method can be invoked from outside of the UI thread 8761 * only when this View is attached to a window.</p> 8762 * 8763 * @param delayMilliseconds the duration in milliseconds to delay the 8764 * invalidation by 8765 * @param left The left coordinate of the rectangle to invalidate. 8766 * @param top The top coordinate of the rectangle to invalidate. 8767 * @param right The right coordinate of the rectangle to invalidate. 8768 * @param bottom The bottom coordinate of the rectangle to invalidate. 8769 */ 8770 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8771 int right, int bottom) { 8772 8773 // We try only with the AttachInfo because there's no point in invalidating 8774 // if we are not attached to our window 8775 AttachInfo attachInfo = mAttachInfo; 8776 if (attachInfo != null) { 8777 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8778 info.target = this; 8779 info.left = left; 8780 info.top = top; 8781 info.right = right; 8782 info.bottom = bottom; 8783 8784 final Message msg = Message.obtain(); 8785 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 8786 msg.obj = info; 8787 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8788 } 8789 } 8790 8791 /** 8792 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 8793 * This event is sent at most once every 8794 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 8795 */ 8796 private void postSendViewScrolledAccessibilityEventCallback() { 8797 if (mSendViewScrolledAccessibilityEvent == null) { 8798 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 8799 } 8800 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 8801 mSendViewScrolledAccessibilityEvent.mIsPending = true; 8802 postDelayed(mSendViewScrolledAccessibilityEvent, 8803 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 8804 } 8805 } 8806 8807 /** 8808 * Called by a parent to request that a child update its values for mScrollX 8809 * and mScrollY if necessary. This will typically be done if the child is 8810 * animating a scroll using a {@link android.widget.Scroller Scroller} 8811 * object. 8812 */ 8813 public void computeScroll() { 8814 } 8815 8816 /** 8817 * <p>Indicate whether the horizontal edges are faded when the view is 8818 * scrolled horizontally.</p> 8819 * 8820 * @return true if the horizontal edges should are faded on scroll, false 8821 * otherwise 8822 * 8823 * @see #setHorizontalFadingEdgeEnabled(boolean) 8824 * @attr ref android.R.styleable#View_requiresFadingEdge 8825 */ 8826 public boolean isHorizontalFadingEdgeEnabled() { 8827 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 8828 } 8829 8830 /** 8831 * <p>Define whether the horizontal edges should be faded when this view 8832 * is scrolled horizontally.</p> 8833 * 8834 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 8835 * be faded when the view is scrolled 8836 * horizontally 8837 * 8838 * @see #isHorizontalFadingEdgeEnabled() 8839 * @attr ref android.R.styleable#View_requiresFadingEdge 8840 */ 8841 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 8842 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 8843 if (horizontalFadingEdgeEnabled) { 8844 initScrollCache(); 8845 } 8846 8847 mViewFlags ^= FADING_EDGE_HORIZONTAL; 8848 } 8849 } 8850 8851 /** 8852 * <p>Indicate whether the vertical edges are faded when the view is 8853 * scrolled horizontally.</p> 8854 * 8855 * @return true if the vertical edges should are faded on scroll, false 8856 * otherwise 8857 * 8858 * @see #setVerticalFadingEdgeEnabled(boolean) 8859 * @attr ref android.R.styleable#View_requiresFadingEdge 8860 */ 8861 public boolean isVerticalFadingEdgeEnabled() { 8862 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 8863 } 8864 8865 /** 8866 * <p>Define whether the vertical edges should be faded when this view 8867 * is scrolled vertically.</p> 8868 * 8869 * @param verticalFadingEdgeEnabled true if the vertical edges should 8870 * be faded when the view is scrolled 8871 * vertically 8872 * 8873 * @see #isVerticalFadingEdgeEnabled() 8874 * @attr ref android.R.styleable#View_requiresFadingEdge 8875 */ 8876 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 8877 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 8878 if (verticalFadingEdgeEnabled) { 8879 initScrollCache(); 8880 } 8881 8882 mViewFlags ^= FADING_EDGE_VERTICAL; 8883 } 8884 } 8885 8886 /** 8887 * Returns the strength, or intensity, of the top faded edge. The strength is 8888 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8889 * returns 0.0 or 1.0 but no value in between. 8890 * 8891 * Subclasses should override this method to provide a smoother fade transition 8892 * when scrolling occurs. 8893 * 8894 * @return the intensity of the top fade as a float between 0.0f and 1.0f 8895 */ 8896 protected float getTopFadingEdgeStrength() { 8897 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 8898 } 8899 8900 /** 8901 * Returns the strength, or intensity, of the bottom faded edge. The strength is 8902 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8903 * returns 0.0 or 1.0 but no value in between. 8904 * 8905 * Subclasses should override this method to provide a smoother fade transition 8906 * when scrolling occurs. 8907 * 8908 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 8909 */ 8910 protected float getBottomFadingEdgeStrength() { 8911 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 8912 computeVerticalScrollRange() ? 1.0f : 0.0f; 8913 } 8914 8915 /** 8916 * Returns the strength, or intensity, of the left faded edge. The strength is 8917 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8918 * returns 0.0 or 1.0 but no value in between. 8919 * 8920 * Subclasses should override this method to provide a smoother fade transition 8921 * when scrolling occurs. 8922 * 8923 * @return the intensity of the left fade as a float between 0.0f and 1.0f 8924 */ 8925 protected float getLeftFadingEdgeStrength() { 8926 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 8927 } 8928 8929 /** 8930 * Returns the strength, or intensity, of the right faded edge. The strength is 8931 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8932 * returns 0.0 or 1.0 but no value in between. 8933 * 8934 * Subclasses should override this method to provide a smoother fade transition 8935 * when scrolling occurs. 8936 * 8937 * @return the intensity of the right fade as a float between 0.0f and 1.0f 8938 */ 8939 protected float getRightFadingEdgeStrength() { 8940 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 8941 computeHorizontalScrollRange() ? 1.0f : 0.0f; 8942 } 8943 8944 /** 8945 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 8946 * scrollbar is not drawn by default.</p> 8947 * 8948 * @return true if the horizontal scrollbar should be painted, false 8949 * otherwise 8950 * 8951 * @see #setHorizontalScrollBarEnabled(boolean) 8952 */ 8953 public boolean isHorizontalScrollBarEnabled() { 8954 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 8955 } 8956 8957 /** 8958 * <p>Define whether the horizontal scrollbar should be drawn or not. The 8959 * scrollbar is not drawn by default.</p> 8960 * 8961 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 8962 * be painted 8963 * 8964 * @see #isHorizontalScrollBarEnabled() 8965 */ 8966 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 8967 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 8968 mViewFlags ^= SCROLLBARS_HORIZONTAL; 8969 computeOpaqueFlags(); 8970 resolvePadding(); 8971 } 8972 } 8973 8974 /** 8975 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 8976 * scrollbar is not drawn by default.</p> 8977 * 8978 * @return true if the vertical scrollbar should be painted, false 8979 * otherwise 8980 * 8981 * @see #setVerticalScrollBarEnabled(boolean) 8982 */ 8983 public boolean isVerticalScrollBarEnabled() { 8984 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 8985 } 8986 8987 /** 8988 * <p>Define whether the vertical scrollbar should be drawn or not. The 8989 * scrollbar is not drawn by default.</p> 8990 * 8991 * @param verticalScrollBarEnabled true if the vertical scrollbar should 8992 * be painted 8993 * 8994 * @see #isVerticalScrollBarEnabled() 8995 */ 8996 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 8997 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 8998 mViewFlags ^= SCROLLBARS_VERTICAL; 8999 computeOpaqueFlags(); 9000 resolvePadding(); 9001 } 9002 } 9003 9004 /** 9005 * @hide 9006 */ 9007 protected void recomputePadding() { 9008 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 9009 } 9010 9011 /** 9012 * Define whether scrollbars will fade when the view is not scrolling. 9013 * 9014 * @param fadeScrollbars wheter to enable fading 9015 * 9016 */ 9017 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 9018 initScrollCache(); 9019 final ScrollabilityCache scrollabilityCache = mScrollCache; 9020 scrollabilityCache.fadeScrollBars = fadeScrollbars; 9021 if (fadeScrollbars) { 9022 scrollabilityCache.state = ScrollabilityCache.OFF; 9023 } else { 9024 scrollabilityCache.state = ScrollabilityCache.ON; 9025 } 9026 } 9027 9028 /** 9029 * 9030 * Returns true if scrollbars will fade when this view is not scrolling 9031 * 9032 * @return true if scrollbar fading is enabled 9033 */ 9034 public boolean isScrollbarFadingEnabled() { 9035 return mScrollCache != null && mScrollCache.fadeScrollBars; 9036 } 9037 9038 /** 9039 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 9040 * inset. When inset, they add to the padding of the view. And the scrollbars 9041 * can be drawn inside the padding area or on the edge of the view. For example, 9042 * if a view has a background drawable and you want to draw the scrollbars 9043 * inside the padding specified by the drawable, you can use 9044 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 9045 * appear at the edge of the view, ignoring the padding, then you can use 9046 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 9047 * @param style the style of the scrollbars. Should be one of 9048 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 9049 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 9050 * @see #SCROLLBARS_INSIDE_OVERLAY 9051 * @see #SCROLLBARS_INSIDE_INSET 9052 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9053 * @see #SCROLLBARS_OUTSIDE_INSET 9054 */ 9055 public void setScrollBarStyle(int style) { 9056 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 9057 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 9058 computeOpaqueFlags(); 9059 resolvePadding(); 9060 } 9061 } 9062 9063 /** 9064 * <p>Returns the current scrollbar style.</p> 9065 * @return the current scrollbar style 9066 * @see #SCROLLBARS_INSIDE_OVERLAY 9067 * @see #SCROLLBARS_INSIDE_INSET 9068 * @see #SCROLLBARS_OUTSIDE_OVERLAY 9069 * @see #SCROLLBARS_OUTSIDE_INSET 9070 */ 9071 @ViewDebug.ExportedProperty(mapping = { 9072 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 9073 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 9074 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 9075 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 9076 }) 9077 public int getScrollBarStyle() { 9078 return mViewFlags & SCROLLBARS_STYLE_MASK; 9079 } 9080 9081 /** 9082 * <p>Compute the horizontal range that the horizontal scrollbar 9083 * represents.</p> 9084 * 9085 * <p>The range is expressed in arbitrary units that must be the same as the 9086 * units used by {@link #computeHorizontalScrollExtent()} and 9087 * {@link #computeHorizontalScrollOffset()}.</p> 9088 * 9089 * <p>The default range is the drawing width of this view.</p> 9090 * 9091 * @return the total horizontal range represented by the horizontal 9092 * scrollbar 9093 * 9094 * @see #computeHorizontalScrollExtent() 9095 * @see #computeHorizontalScrollOffset() 9096 * @see android.widget.ScrollBarDrawable 9097 */ 9098 protected int computeHorizontalScrollRange() { 9099 return getWidth(); 9100 } 9101 9102 /** 9103 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 9104 * within the horizontal range. This value is used to compute the position 9105 * of the thumb within the scrollbar's track.</p> 9106 * 9107 * <p>The range is expressed in arbitrary units that must be the same as the 9108 * units used by {@link #computeHorizontalScrollRange()} and 9109 * {@link #computeHorizontalScrollExtent()}.</p> 9110 * 9111 * <p>The default offset is the scroll offset of this view.</p> 9112 * 9113 * @return the horizontal offset of the scrollbar's thumb 9114 * 9115 * @see #computeHorizontalScrollRange() 9116 * @see #computeHorizontalScrollExtent() 9117 * @see android.widget.ScrollBarDrawable 9118 */ 9119 protected int computeHorizontalScrollOffset() { 9120 return mScrollX; 9121 } 9122 9123 /** 9124 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 9125 * within the horizontal range. This value is used to compute the length 9126 * of the thumb within the scrollbar's track.</p> 9127 * 9128 * <p>The range is expressed in arbitrary units that must be the same as the 9129 * units used by {@link #computeHorizontalScrollRange()} and 9130 * {@link #computeHorizontalScrollOffset()}.</p> 9131 * 9132 * <p>The default extent is the drawing width of this view.</p> 9133 * 9134 * @return the horizontal extent of the scrollbar's thumb 9135 * 9136 * @see #computeHorizontalScrollRange() 9137 * @see #computeHorizontalScrollOffset() 9138 * @see android.widget.ScrollBarDrawable 9139 */ 9140 protected int computeHorizontalScrollExtent() { 9141 return getWidth(); 9142 } 9143 9144 /** 9145 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 9146 * 9147 * <p>The range is expressed in arbitrary units that must be the same as the 9148 * units used by {@link #computeVerticalScrollExtent()} and 9149 * {@link #computeVerticalScrollOffset()}.</p> 9150 * 9151 * @return the total vertical range represented by the vertical scrollbar 9152 * 9153 * <p>The default range is the drawing height of this view.</p> 9154 * 9155 * @see #computeVerticalScrollExtent() 9156 * @see #computeVerticalScrollOffset() 9157 * @see android.widget.ScrollBarDrawable 9158 */ 9159 protected int computeVerticalScrollRange() { 9160 return getHeight(); 9161 } 9162 9163 /** 9164 * <p>Compute the vertical offset of the vertical scrollbar's thumb 9165 * within the horizontal range. This value is used to compute the position 9166 * of the thumb within the scrollbar's track.</p> 9167 * 9168 * <p>The range is expressed in arbitrary units that must be the same as the 9169 * units used by {@link #computeVerticalScrollRange()} and 9170 * {@link #computeVerticalScrollExtent()}.</p> 9171 * 9172 * <p>The default offset is the scroll offset of this view.</p> 9173 * 9174 * @return the vertical offset of the scrollbar's thumb 9175 * 9176 * @see #computeVerticalScrollRange() 9177 * @see #computeVerticalScrollExtent() 9178 * @see android.widget.ScrollBarDrawable 9179 */ 9180 protected int computeVerticalScrollOffset() { 9181 return mScrollY; 9182 } 9183 9184 /** 9185 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 9186 * within the vertical range. This value is used to compute the length 9187 * of the thumb within the scrollbar's track.</p> 9188 * 9189 * <p>The range is expressed in arbitrary units that must be the same as the 9190 * units used by {@link #computeVerticalScrollRange()} and 9191 * {@link #computeVerticalScrollOffset()}.</p> 9192 * 9193 * <p>The default extent is the drawing height of this view.</p> 9194 * 9195 * @return the vertical extent of the scrollbar's thumb 9196 * 9197 * @see #computeVerticalScrollRange() 9198 * @see #computeVerticalScrollOffset() 9199 * @see android.widget.ScrollBarDrawable 9200 */ 9201 protected int computeVerticalScrollExtent() { 9202 return getHeight(); 9203 } 9204 9205 /** 9206 * Check if this view can be scrolled horizontally in a certain direction. 9207 * 9208 * @param direction Negative to check scrolling left, positive to check scrolling right. 9209 * @return true if this view can be scrolled in the specified direction, false otherwise. 9210 */ 9211 public boolean canScrollHorizontally(int direction) { 9212 final int offset = computeHorizontalScrollOffset(); 9213 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 9214 if (range == 0) return false; 9215 if (direction < 0) { 9216 return offset > 0; 9217 } else { 9218 return offset < range - 1; 9219 } 9220 } 9221 9222 /** 9223 * Check if this view can be scrolled vertically in a certain direction. 9224 * 9225 * @param direction Negative to check scrolling up, positive to check scrolling down. 9226 * @return true if this view can be scrolled in the specified direction, false otherwise. 9227 */ 9228 public boolean canScrollVertically(int direction) { 9229 final int offset = computeVerticalScrollOffset(); 9230 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 9231 if (range == 0) return false; 9232 if (direction < 0) { 9233 return offset > 0; 9234 } else { 9235 return offset < range - 1; 9236 } 9237 } 9238 9239 /** 9240 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 9241 * scrollbars are painted only if they have been awakened first.</p> 9242 * 9243 * @param canvas the canvas on which to draw the scrollbars 9244 * 9245 * @see #awakenScrollBars(int) 9246 */ 9247 protected final void onDrawScrollBars(Canvas canvas) { 9248 // scrollbars are drawn only when the animation is running 9249 final ScrollabilityCache cache = mScrollCache; 9250 if (cache != null) { 9251 9252 int state = cache.state; 9253 9254 if (state == ScrollabilityCache.OFF) { 9255 return; 9256 } 9257 9258 boolean invalidate = false; 9259 9260 if (state == ScrollabilityCache.FADING) { 9261 // We're fading -- get our fade interpolation 9262 if (cache.interpolatorValues == null) { 9263 cache.interpolatorValues = new float[1]; 9264 } 9265 9266 float[] values = cache.interpolatorValues; 9267 9268 // Stops the animation if we're done 9269 if (cache.scrollBarInterpolator.timeToValues(values) == 9270 Interpolator.Result.FREEZE_END) { 9271 cache.state = ScrollabilityCache.OFF; 9272 } else { 9273 cache.scrollBar.setAlpha(Math.round(values[0])); 9274 } 9275 9276 // This will make the scroll bars inval themselves after 9277 // drawing. We only want this when we're fading so that 9278 // we prevent excessive redraws 9279 invalidate = true; 9280 } else { 9281 // We're just on -- but we may have been fading before so 9282 // reset alpha 9283 cache.scrollBar.setAlpha(255); 9284 } 9285 9286 9287 final int viewFlags = mViewFlags; 9288 9289 final boolean drawHorizontalScrollBar = 9290 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9291 final boolean drawVerticalScrollBar = 9292 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 9293 && !isVerticalScrollBarHidden(); 9294 9295 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 9296 final int width = mRight - mLeft; 9297 final int height = mBottom - mTop; 9298 9299 final ScrollBarDrawable scrollBar = cache.scrollBar; 9300 9301 final int scrollX = mScrollX; 9302 final int scrollY = mScrollY; 9303 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 9304 9305 int left, top, right, bottom; 9306 9307 if (drawHorizontalScrollBar) { 9308 int size = scrollBar.getSize(false); 9309 if (size <= 0) { 9310 size = cache.scrollBarSize; 9311 } 9312 9313 scrollBar.setParameters(computeHorizontalScrollRange(), 9314 computeHorizontalScrollOffset(), 9315 computeHorizontalScrollExtent(), false); 9316 final int verticalScrollBarGap = drawVerticalScrollBar ? 9317 getVerticalScrollbarWidth() : 0; 9318 top = scrollY + height - size - (mUserPaddingBottom & inside); 9319 left = scrollX + (mPaddingLeft & inside); 9320 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 9321 bottom = top + size; 9322 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 9323 if (invalidate) { 9324 invalidate(left, top, right, bottom); 9325 } 9326 } 9327 9328 if (drawVerticalScrollBar) { 9329 int size = scrollBar.getSize(true); 9330 if (size <= 0) { 9331 size = cache.scrollBarSize; 9332 } 9333 9334 scrollBar.setParameters(computeVerticalScrollRange(), 9335 computeVerticalScrollOffset(), 9336 computeVerticalScrollExtent(), true); 9337 switch (mVerticalScrollbarPosition) { 9338 default: 9339 case SCROLLBAR_POSITION_DEFAULT: 9340 case SCROLLBAR_POSITION_RIGHT: 9341 left = scrollX + width - size - (mUserPaddingRight & inside); 9342 break; 9343 case SCROLLBAR_POSITION_LEFT: 9344 left = scrollX + (mUserPaddingLeft & inside); 9345 break; 9346 } 9347 top = scrollY + (mPaddingTop & inside); 9348 right = left + size; 9349 bottom = scrollY + height - (mUserPaddingBottom & inside); 9350 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 9351 if (invalidate) { 9352 invalidate(left, top, right, bottom); 9353 } 9354 } 9355 } 9356 } 9357 } 9358 9359 /** 9360 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 9361 * FastScroller is visible. 9362 * @return whether to temporarily hide the vertical scrollbar 9363 * @hide 9364 */ 9365 protected boolean isVerticalScrollBarHidden() { 9366 return false; 9367 } 9368 9369 /** 9370 * <p>Draw the horizontal scrollbar if 9371 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 9372 * 9373 * @param canvas the canvas on which to draw the scrollbar 9374 * @param scrollBar the scrollbar's drawable 9375 * 9376 * @see #isHorizontalScrollBarEnabled() 9377 * @see #computeHorizontalScrollRange() 9378 * @see #computeHorizontalScrollExtent() 9379 * @see #computeHorizontalScrollOffset() 9380 * @see android.widget.ScrollBarDrawable 9381 * @hide 9382 */ 9383 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 9384 int l, int t, int r, int b) { 9385 scrollBar.setBounds(l, t, r, b); 9386 scrollBar.draw(canvas); 9387 } 9388 9389 /** 9390 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 9391 * returns true.</p> 9392 * 9393 * @param canvas the canvas on which to draw the scrollbar 9394 * @param scrollBar the scrollbar's drawable 9395 * 9396 * @see #isVerticalScrollBarEnabled() 9397 * @see #computeVerticalScrollRange() 9398 * @see #computeVerticalScrollExtent() 9399 * @see #computeVerticalScrollOffset() 9400 * @see android.widget.ScrollBarDrawable 9401 * @hide 9402 */ 9403 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 9404 int l, int t, int r, int b) { 9405 scrollBar.setBounds(l, t, r, b); 9406 scrollBar.draw(canvas); 9407 } 9408 9409 /** 9410 * Implement this to do your drawing. 9411 * 9412 * @param canvas the canvas on which the background will be drawn 9413 */ 9414 protected void onDraw(Canvas canvas) { 9415 } 9416 9417 /* 9418 * Caller is responsible for calling requestLayout if necessary. 9419 * (This allows addViewInLayout to not request a new layout.) 9420 */ 9421 void assignParent(ViewParent parent) { 9422 if (mParent == null) { 9423 mParent = parent; 9424 } else if (parent == null) { 9425 mParent = null; 9426 } else { 9427 throw new RuntimeException("view " + this + " being added, but" 9428 + " it already has a parent"); 9429 } 9430 } 9431 9432 /** 9433 * This is called when the view is attached to a window. At this point it 9434 * has a Surface and will start drawing. Note that this function is 9435 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 9436 * however it may be called any time before the first onDraw -- including 9437 * before or after {@link #onMeasure(int, int)}. 9438 * 9439 * @see #onDetachedFromWindow() 9440 */ 9441 protected void onAttachedToWindow() { 9442 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 9443 mParent.requestTransparentRegion(this); 9444 } 9445 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 9446 initialAwakenScrollBars(); 9447 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 9448 } 9449 jumpDrawablesToCurrentState(); 9450 // Order is important here: LayoutDirection MUST be resolved before Padding 9451 // and TextDirection 9452 resolveLayoutDirectionIfNeeded(); 9453 resolvePadding(); 9454 resolveTextDirection(); 9455 if (isFocused()) { 9456 InputMethodManager imm = InputMethodManager.peekInstance(); 9457 imm.focusIn(this); 9458 } 9459 } 9460 9461 /** 9462 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 9463 * that the parent directionality can and will be resolved before its children. 9464 */ 9465 private void resolveLayoutDirectionIfNeeded() { 9466 // Do not resolve if it is not needed 9467 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return; 9468 9469 // Clear any previous layout direction resolution 9470 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_RTL; 9471 9472 // Reset also TextDirection as a change into LayoutDirection may impact the selected 9473 // TextDirectionHeuristic 9474 resetResolvedTextDirection(); 9475 9476 // Set resolved depending on layout direction 9477 switch (getLayoutDirection()) { 9478 case LAYOUT_DIRECTION_INHERIT: 9479 // We cannot do the resolution if there is no parent 9480 if (mParent == null) return; 9481 9482 // If this is root view, no need to look at parent's layout dir. 9483 if (mParent instanceof ViewGroup) { 9484 ViewGroup viewGroup = ((ViewGroup) mParent); 9485 9486 // Check if the parent view group can resolve 9487 if (! viewGroup.canResolveLayoutDirection()) { 9488 return; 9489 } 9490 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 9491 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9492 } 9493 } 9494 break; 9495 case LAYOUT_DIRECTION_RTL: 9496 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9497 break; 9498 case LAYOUT_DIRECTION_LOCALE: 9499 if(isLayoutDirectionRtl(Locale.getDefault())) { 9500 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9501 } 9502 break; 9503 default: 9504 // Nothing to do, LTR by default 9505 } 9506 9507 // Set to resolved 9508 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 9509 } 9510 9511 /** 9512 * @hide 9513 */ 9514 protected void resolvePadding() { 9515 // If the user specified the absolute padding (either with android:padding or 9516 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 9517 // use the default padding or the padding from the background drawable 9518 // (stored at this point in mPadding*) 9519 switch (getResolvedLayoutDirection()) { 9520 case LAYOUT_DIRECTION_RTL: 9521 // Start user padding override Right user padding. Otherwise, if Right user 9522 // padding is not defined, use the default Right padding. If Right user padding 9523 // is defined, just use it. 9524 if (mUserPaddingStart >= 0) { 9525 mUserPaddingRight = mUserPaddingStart; 9526 } else if (mUserPaddingRight < 0) { 9527 mUserPaddingRight = mPaddingRight; 9528 } 9529 if (mUserPaddingEnd >= 0) { 9530 mUserPaddingLeft = mUserPaddingEnd; 9531 } else if (mUserPaddingLeft < 0) { 9532 mUserPaddingLeft = mPaddingLeft; 9533 } 9534 break; 9535 case LAYOUT_DIRECTION_LTR: 9536 default: 9537 // Start user padding override Left user padding. Otherwise, if Left user 9538 // padding is not defined, use the default left padding. If Left user padding 9539 // is defined, just use it. 9540 if (mUserPaddingStart >= 0) { 9541 mUserPaddingLeft = mUserPaddingStart; 9542 } else if (mUserPaddingLeft < 0) { 9543 mUserPaddingLeft = mPaddingLeft; 9544 } 9545 if (mUserPaddingEnd >= 0) { 9546 mUserPaddingRight = mUserPaddingEnd; 9547 } else if (mUserPaddingRight < 0) { 9548 mUserPaddingRight = mPaddingRight; 9549 } 9550 } 9551 9552 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 9553 9554 recomputePadding(); 9555 } 9556 9557 /** 9558 * Return true if layout direction resolution can be done 9559 * 9560 * @hide 9561 */ 9562 protected boolean canResolveLayoutDirection() { 9563 switch (getLayoutDirection()) { 9564 case LAYOUT_DIRECTION_INHERIT: 9565 return (mParent != null); 9566 default: 9567 return true; 9568 } 9569 } 9570 9571 /** 9572 * Reset the resolved layout direction. 9573 * 9574 * Subclasses need to override this method to clear cached information that depends on the 9575 * resolved layout direction, or to inform child views that inherit their layout direction. 9576 * Overrides must also call the superclass implementation at the start of their implementation. 9577 * 9578 * @hide 9579 */ 9580 protected void resetResolvedLayoutDirection() { 9581 // Reset the current View resolution 9582 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED; 9583 } 9584 9585 /** 9586 * Check if a Locale is corresponding to a RTL script. 9587 * 9588 * @param locale Locale to check 9589 * @return true if a Locale is corresponding to a RTL script. 9590 * 9591 * @hide 9592 */ 9593 protected static boolean isLayoutDirectionRtl(Locale locale) { 9594 return (LocaleUtil.TEXT_LAYOUT_DIRECTION_RTL_DO_NOT_USE == 9595 LocaleUtil.getLayoutDirectionFromLocale(locale)); 9596 } 9597 9598 /** 9599 * This is called when the view is detached from a window. At this point it 9600 * no longer has a surface for drawing. 9601 * 9602 * @see #onAttachedToWindow() 9603 */ 9604 protected void onDetachedFromWindow() { 9605 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 9606 9607 removeUnsetPressCallback(); 9608 removeLongPressCallback(); 9609 removePerformClickCallback(); 9610 removeSendViewScrolledAccessibilityEventCallback(); 9611 9612 destroyDrawingCache(); 9613 9614 destroyLayer(); 9615 9616 if (mDisplayList != null) { 9617 mDisplayList.invalidate(); 9618 } 9619 9620 if (mAttachInfo != null) { 9621 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 9622 } 9623 9624 mCurrentAnimation = null; 9625 9626 resetResolvedLayoutDirection(); 9627 resetResolvedTextDirection(); 9628 } 9629 9630 /** 9631 * @return The number of times this view has been attached to a window 9632 */ 9633 protected int getWindowAttachCount() { 9634 return mWindowAttachCount; 9635 } 9636 9637 /** 9638 * Retrieve a unique token identifying the window this view is attached to. 9639 * @return Return the window's token for use in 9640 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 9641 */ 9642 public IBinder getWindowToken() { 9643 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 9644 } 9645 9646 /** 9647 * Retrieve a unique token identifying the top-level "real" window of 9648 * the window that this view is attached to. That is, this is like 9649 * {@link #getWindowToken}, except if the window this view in is a panel 9650 * window (attached to another containing window), then the token of 9651 * the containing window is returned instead. 9652 * 9653 * @return Returns the associated window token, either 9654 * {@link #getWindowToken()} or the containing window's token. 9655 */ 9656 public IBinder getApplicationWindowToken() { 9657 AttachInfo ai = mAttachInfo; 9658 if (ai != null) { 9659 IBinder appWindowToken = ai.mPanelParentWindowToken; 9660 if (appWindowToken == null) { 9661 appWindowToken = ai.mWindowToken; 9662 } 9663 return appWindowToken; 9664 } 9665 return null; 9666 } 9667 9668 /** 9669 * Retrieve private session object this view hierarchy is using to 9670 * communicate with the window manager. 9671 * @return the session object to communicate with the window manager 9672 */ 9673 /*package*/ IWindowSession getWindowSession() { 9674 return mAttachInfo != null ? mAttachInfo.mSession : null; 9675 } 9676 9677 /** 9678 * @param info the {@link android.view.View.AttachInfo} to associated with 9679 * this view 9680 */ 9681 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 9682 //System.out.println("Attached! " + this); 9683 mAttachInfo = info; 9684 mWindowAttachCount++; 9685 // We will need to evaluate the drawable state at least once. 9686 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9687 if (mFloatingTreeObserver != null) { 9688 info.mTreeObserver.merge(mFloatingTreeObserver); 9689 mFloatingTreeObserver = null; 9690 } 9691 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 9692 mAttachInfo.mScrollContainers.add(this); 9693 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 9694 } 9695 performCollectViewAttributes(visibility); 9696 onAttachedToWindow(); 9697 9698 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9699 mOnAttachStateChangeListeners; 9700 if (listeners != null && listeners.size() > 0) { 9701 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9702 // perform the dispatching. The iterator is a safe guard against listeners that 9703 // could mutate the list by calling the various add/remove methods. This prevents 9704 // the array from being modified while we iterate it. 9705 for (OnAttachStateChangeListener listener : listeners) { 9706 listener.onViewAttachedToWindow(this); 9707 } 9708 } 9709 9710 int vis = info.mWindowVisibility; 9711 if (vis != GONE) { 9712 onWindowVisibilityChanged(vis); 9713 } 9714 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 9715 // If nobody has evaluated the drawable state yet, then do it now. 9716 refreshDrawableState(); 9717 } 9718 } 9719 9720 void dispatchDetachedFromWindow() { 9721 AttachInfo info = mAttachInfo; 9722 if (info != null) { 9723 int vis = info.mWindowVisibility; 9724 if (vis != GONE) { 9725 onWindowVisibilityChanged(GONE); 9726 } 9727 } 9728 9729 onDetachedFromWindow(); 9730 9731 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9732 mOnAttachStateChangeListeners; 9733 if (listeners != null && listeners.size() > 0) { 9734 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9735 // perform the dispatching. The iterator is a safe guard against listeners that 9736 // could mutate the list by calling the various add/remove methods. This prevents 9737 // the array from being modified while we iterate it. 9738 for (OnAttachStateChangeListener listener : listeners) { 9739 listener.onViewDetachedFromWindow(this); 9740 } 9741 } 9742 9743 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 9744 mAttachInfo.mScrollContainers.remove(this); 9745 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 9746 } 9747 9748 mAttachInfo = null; 9749 } 9750 9751 /** 9752 * Store this view hierarchy's frozen state into the given container. 9753 * 9754 * @param container The SparseArray in which to save the view's state. 9755 * 9756 * @see #restoreHierarchyState(android.util.SparseArray) 9757 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9758 * @see #onSaveInstanceState() 9759 */ 9760 public void saveHierarchyState(SparseArray<Parcelable> container) { 9761 dispatchSaveInstanceState(container); 9762 } 9763 9764 /** 9765 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 9766 * this view and its children. May be overridden to modify how freezing happens to a 9767 * view's children; for example, some views may want to not store state for their children. 9768 * 9769 * @param container The SparseArray in which to save the view's state. 9770 * 9771 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9772 * @see #saveHierarchyState(android.util.SparseArray) 9773 * @see #onSaveInstanceState() 9774 */ 9775 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 9776 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 9777 mPrivateFlags &= ~SAVE_STATE_CALLED; 9778 Parcelable state = onSaveInstanceState(); 9779 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9780 throw new IllegalStateException( 9781 "Derived class did not call super.onSaveInstanceState()"); 9782 } 9783 if (state != null) { 9784 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 9785 // + ": " + state); 9786 container.put(mID, state); 9787 } 9788 } 9789 } 9790 9791 /** 9792 * Hook allowing a view to generate a representation of its internal state 9793 * that can later be used to create a new instance with that same state. 9794 * This state should only contain information that is not persistent or can 9795 * not be reconstructed later. For example, you will never store your 9796 * current position on screen because that will be computed again when a 9797 * new instance of the view is placed in its view hierarchy. 9798 * <p> 9799 * Some examples of things you may store here: the current cursor position 9800 * in a text view (but usually not the text itself since that is stored in a 9801 * content provider or other persistent storage), the currently selected 9802 * item in a list view. 9803 * 9804 * @return Returns a Parcelable object containing the view's current dynamic 9805 * state, or null if there is nothing interesting to save. The 9806 * default implementation returns null. 9807 * @see #onRestoreInstanceState(android.os.Parcelable) 9808 * @see #saveHierarchyState(android.util.SparseArray) 9809 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9810 * @see #setSaveEnabled(boolean) 9811 */ 9812 protected Parcelable onSaveInstanceState() { 9813 mPrivateFlags |= SAVE_STATE_CALLED; 9814 return BaseSavedState.EMPTY_STATE; 9815 } 9816 9817 /** 9818 * Restore this view hierarchy's frozen state from the given container. 9819 * 9820 * @param container The SparseArray which holds previously frozen states. 9821 * 9822 * @see #saveHierarchyState(android.util.SparseArray) 9823 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9824 * @see #onRestoreInstanceState(android.os.Parcelable) 9825 */ 9826 public void restoreHierarchyState(SparseArray<Parcelable> container) { 9827 dispatchRestoreInstanceState(container); 9828 } 9829 9830 /** 9831 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 9832 * state for this view and its children. May be overridden to modify how restoring 9833 * happens to a view's children; for example, some views may want to not store state 9834 * for their children. 9835 * 9836 * @param container The SparseArray which holds previously saved state. 9837 * 9838 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9839 * @see #restoreHierarchyState(android.util.SparseArray) 9840 * @see #onRestoreInstanceState(android.os.Parcelable) 9841 */ 9842 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 9843 if (mID != NO_ID) { 9844 Parcelable state = container.get(mID); 9845 if (state != null) { 9846 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 9847 // + ": " + state); 9848 mPrivateFlags &= ~SAVE_STATE_CALLED; 9849 onRestoreInstanceState(state); 9850 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9851 throw new IllegalStateException( 9852 "Derived class did not call super.onRestoreInstanceState()"); 9853 } 9854 } 9855 } 9856 } 9857 9858 /** 9859 * Hook allowing a view to re-apply a representation of its internal state that had previously 9860 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 9861 * null state. 9862 * 9863 * @param state The frozen state that had previously been returned by 9864 * {@link #onSaveInstanceState}. 9865 * 9866 * @see #onSaveInstanceState() 9867 * @see #restoreHierarchyState(android.util.SparseArray) 9868 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9869 */ 9870 protected void onRestoreInstanceState(Parcelable state) { 9871 mPrivateFlags |= SAVE_STATE_CALLED; 9872 if (state != BaseSavedState.EMPTY_STATE && state != null) { 9873 throw new IllegalArgumentException("Wrong state class, expecting View State but " 9874 + "received " + state.getClass().toString() + " instead. This usually happens " 9875 + "when two views of different type have the same id in the same hierarchy. " 9876 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 9877 + "other views do not use the same id."); 9878 } 9879 } 9880 9881 /** 9882 * <p>Return the time at which the drawing of the view hierarchy started.</p> 9883 * 9884 * @return the drawing start time in milliseconds 9885 */ 9886 public long getDrawingTime() { 9887 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 9888 } 9889 9890 /** 9891 * <p>Enables or disables the duplication of the parent's state into this view. When 9892 * duplication is enabled, this view gets its drawable state from its parent rather 9893 * than from its own internal properties.</p> 9894 * 9895 * <p>Note: in the current implementation, setting this property to true after the 9896 * view was added to a ViewGroup might have no effect at all. This property should 9897 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 9898 * 9899 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 9900 * property is enabled, an exception will be thrown.</p> 9901 * 9902 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 9903 * parent, these states should not be affected by this method.</p> 9904 * 9905 * @param enabled True to enable duplication of the parent's drawable state, false 9906 * to disable it. 9907 * 9908 * @see #getDrawableState() 9909 * @see #isDuplicateParentStateEnabled() 9910 */ 9911 public void setDuplicateParentStateEnabled(boolean enabled) { 9912 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 9913 } 9914 9915 /** 9916 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 9917 * 9918 * @return True if this view's drawable state is duplicated from the parent, 9919 * false otherwise 9920 * 9921 * @see #getDrawableState() 9922 * @see #setDuplicateParentStateEnabled(boolean) 9923 */ 9924 public boolean isDuplicateParentStateEnabled() { 9925 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 9926 } 9927 9928 /** 9929 * <p>Specifies the type of layer backing this view. The layer can be 9930 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 9931 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 9932 * 9933 * <p>A layer is associated with an optional {@link android.graphics.Paint} 9934 * instance that controls how the layer is composed on screen. The following 9935 * properties of the paint are taken into account when composing the layer:</p> 9936 * <ul> 9937 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 9938 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 9939 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 9940 * </ul> 9941 * 9942 * <p>If this view has an alpha value set to < 1.0 by calling 9943 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 9944 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 9945 * equivalent to setting a hardware layer on this view and providing a paint with 9946 * the desired alpha value.<p> 9947 * 9948 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 9949 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 9950 * for more information on when and how to use layers.</p> 9951 * 9952 * @param layerType The ype of layer to use with this view, must be one of 9953 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9954 * {@link #LAYER_TYPE_HARDWARE} 9955 * @param paint The paint used to compose the layer. This argument is optional 9956 * and can be null. It is ignored when the layer type is 9957 * {@link #LAYER_TYPE_NONE} 9958 * 9959 * @see #getLayerType() 9960 * @see #LAYER_TYPE_NONE 9961 * @see #LAYER_TYPE_SOFTWARE 9962 * @see #LAYER_TYPE_HARDWARE 9963 * @see #setAlpha(float) 9964 * 9965 * @attr ref android.R.styleable#View_layerType 9966 */ 9967 public void setLayerType(int layerType, Paint paint) { 9968 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 9969 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 9970 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 9971 } 9972 9973 if (layerType == mLayerType) { 9974 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 9975 mLayerPaint = paint == null ? new Paint() : paint; 9976 invalidateParentCaches(); 9977 invalidate(true); 9978 } 9979 return; 9980 } 9981 9982 // Destroy any previous software drawing cache if needed 9983 switch (mLayerType) { 9984 case LAYER_TYPE_HARDWARE: 9985 destroyLayer(); 9986 // fall through - unaccelerated views may use software layer mechanism instead 9987 case LAYER_TYPE_SOFTWARE: 9988 destroyDrawingCache(); 9989 break; 9990 default: 9991 break; 9992 } 9993 9994 mLayerType = layerType; 9995 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 9996 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 9997 mLocalDirtyRect = layerDisabled ? null : new Rect(); 9998 9999 invalidateParentCaches(); 10000 invalidate(true); 10001 } 10002 10003 /** 10004 * Indicates what type of layer is currently associated with this view. By default 10005 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 10006 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 10007 * for more information on the different types of layers. 10008 * 10009 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 10010 * {@link #LAYER_TYPE_HARDWARE} 10011 * 10012 * @see #setLayerType(int, android.graphics.Paint) 10013 * @see #buildLayer() 10014 * @see #LAYER_TYPE_NONE 10015 * @see #LAYER_TYPE_SOFTWARE 10016 * @see #LAYER_TYPE_HARDWARE 10017 */ 10018 public int getLayerType() { 10019 return mLayerType; 10020 } 10021 10022 /** 10023 * Forces this view's layer to be created and this view to be rendered 10024 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 10025 * invoking this method will have no effect. 10026 * 10027 * This method can for instance be used to render a view into its layer before 10028 * starting an animation. If this view is complex, rendering into the layer 10029 * before starting the animation will avoid skipping frames. 10030 * 10031 * @throws IllegalStateException If this view is not attached to a window 10032 * 10033 * @see #setLayerType(int, android.graphics.Paint) 10034 */ 10035 public void buildLayer() { 10036 if (mLayerType == LAYER_TYPE_NONE) return; 10037 10038 if (mAttachInfo == null) { 10039 throw new IllegalStateException("This view must be attached to a window first"); 10040 } 10041 10042 switch (mLayerType) { 10043 case LAYER_TYPE_HARDWARE: 10044 getHardwareLayer(); 10045 break; 10046 case LAYER_TYPE_SOFTWARE: 10047 buildDrawingCache(true); 10048 break; 10049 } 10050 } 10051 10052 /** 10053 * <p>Returns a hardware layer that can be used to draw this view again 10054 * without executing its draw method.</p> 10055 * 10056 * @return A HardwareLayer ready to render, or null if an error occurred. 10057 */ 10058 HardwareLayer getHardwareLayer() { 10059 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 10060 !mAttachInfo.mHardwareRenderer.isEnabled()) { 10061 return null; 10062 } 10063 10064 final int width = mRight - mLeft; 10065 final int height = mBottom - mTop; 10066 10067 if (width == 0 || height == 0) { 10068 return null; 10069 } 10070 10071 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 10072 if (mHardwareLayer == null) { 10073 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 10074 width, height, isOpaque()); 10075 mLocalDirtyRect.setEmpty(); 10076 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 10077 mHardwareLayer.resize(width, height); 10078 mLocalDirtyRect.setEmpty(); 10079 } 10080 10081 HardwareCanvas currentCanvas = mAttachInfo.mHardwareCanvas; 10082 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 10083 mAttachInfo.mHardwareCanvas = canvas; 10084 try { 10085 canvas.setViewport(width, height); 10086 canvas.onPreDraw(mLocalDirtyRect); 10087 mLocalDirtyRect.setEmpty(); 10088 10089 final int restoreCount = canvas.save(); 10090 10091 computeScroll(); 10092 canvas.translate(-mScrollX, -mScrollY); 10093 10094 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10095 10096 // Fast path for layouts with no backgrounds 10097 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10098 mPrivateFlags &= ~DIRTY_MASK; 10099 dispatchDraw(canvas); 10100 } else { 10101 draw(canvas); 10102 } 10103 10104 canvas.restoreToCount(restoreCount); 10105 } finally { 10106 canvas.onPostDraw(); 10107 mHardwareLayer.end(currentCanvas); 10108 mAttachInfo.mHardwareCanvas = currentCanvas; 10109 } 10110 } 10111 10112 return mHardwareLayer; 10113 } 10114 10115 boolean destroyLayer() { 10116 if (mHardwareLayer != null) { 10117 mHardwareLayer.destroy(); 10118 mHardwareLayer = null; 10119 return true; 10120 } 10121 return false; 10122 } 10123 10124 /** 10125 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 10126 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 10127 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 10128 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 10129 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 10130 * null.</p> 10131 * 10132 * <p>Enabling the drawing cache is similar to 10133 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 10134 * acceleration is turned off. When hardware acceleration is turned on, enabling the 10135 * drawing cache has no effect on rendering because the system uses a different mechanism 10136 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 10137 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 10138 * for information on how to enable software and hardware layers.</p> 10139 * 10140 * <p>This API can be used to manually generate 10141 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 10142 * {@link #getDrawingCache()}.</p> 10143 * 10144 * @param enabled true to enable the drawing cache, false otherwise 10145 * 10146 * @see #isDrawingCacheEnabled() 10147 * @see #getDrawingCache() 10148 * @see #buildDrawingCache() 10149 * @see #setLayerType(int, android.graphics.Paint) 10150 */ 10151 public void setDrawingCacheEnabled(boolean enabled) { 10152 mCachingFailed = false; 10153 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 10154 } 10155 10156 /** 10157 * <p>Indicates whether the drawing cache is enabled for this view.</p> 10158 * 10159 * @return true if the drawing cache is enabled 10160 * 10161 * @see #setDrawingCacheEnabled(boolean) 10162 * @see #getDrawingCache() 10163 */ 10164 @ViewDebug.ExportedProperty(category = "drawing") 10165 public boolean isDrawingCacheEnabled() { 10166 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 10167 } 10168 10169 /** 10170 * Debugging utility which recursively outputs the dirty state of a view and its 10171 * descendants. 10172 * 10173 * @hide 10174 */ 10175 @SuppressWarnings({"UnusedDeclaration"}) 10176 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 10177 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 10178 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 10179 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 10180 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 10181 if (clear) { 10182 mPrivateFlags &= clearMask; 10183 } 10184 if (this instanceof ViewGroup) { 10185 ViewGroup parent = (ViewGroup) this; 10186 final int count = parent.getChildCount(); 10187 for (int i = 0; i < count; i++) { 10188 final View child = parent.getChildAt(i); 10189 child.outputDirtyFlags(indent + " ", clear, clearMask); 10190 } 10191 } 10192 } 10193 10194 /** 10195 * This method is used by ViewGroup to cause its children to restore or recreate their 10196 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 10197 * to recreate its own display list, which would happen if it went through the normal 10198 * draw/dispatchDraw mechanisms. 10199 * 10200 * @hide 10201 */ 10202 protected void dispatchGetDisplayList() {} 10203 10204 /** 10205 * A view that is not attached or hardware accelerated cannot create a display list. 10206 * This method checks these conditions and returns the appropriate result. 10207 * 10208 * @return true if view has the ability to create a display list, false otherwise. 10209 * 10210 * @hide 10211 */ 10212 public boolean canHaveDisplayList() { 10213 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 10214 } 10215 10216 /** 10217 * <p>Returns a display list that can be used to draw this view again 10218 * without executing its draw method.</p> 10219 * 10220 * @return A DisplayList ready to replay, or null if caching is not enabled. 10221 * 10222 * @hide 10223 */ 10224 public DisplayList getDisplayList() { 10225 if (!canHaveDisplayList()) { 10226 return null; 10227 } 10228 10229 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 10230 mDisplayList == null || !mDisplayList.isValid() || 10231 mRecreateDisplayList)) { 10232 // Don't need to recreate the display list, just need to tell our 10233 // children to restore/recreate theirs 10234 if (mDisplayList != null && mDisplayList.isValid() && 10235 !mRecreateDisplayList) { 10236 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10237 mPrivateFlags &= ~DIRTY_MASK; 10238 dispatchGetDisplayList(); 10239 10240 return mDisplayList; 10241 } 10242 10243 // If we got here, we're recreating it. Mark it as such to ensure that 10244 // we copy in child display lists into ours in drawChild() 10245 mRecreateDisplayList = true; 10246 if (mDisplayList == null) { 10247 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 10248 // If we're creating a new display list, make sure our parent gets invalidated 10249 // since they will need to recreate their display list to account for this 10250 // new child display list. 10251 invalidateParentCaches(); 10252 } 10253 10254 final HardwareCanvas canvas = mDisplayList.start(); 10255 int restoreCount = 0; 10256 try { 10257 int width = mRight - mLeft; 10258 int height = mBottom - mTop; 10259 10260 canvas.setViewport(width, height); 10261 // The dirty rect should always be null for a display list 10262 canvas.onPreDraw(null); 10263 10264 computeScroll(); 10265 10266 restoreCount = canvas.save(); 10267 canvas.translate(-mScrollX, -mScrollY); 10268 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10269 mPrivateFlags &= ~DIRTY_MASK; 10270 10271 // Fast path for layouts with no backgrounds 10272 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10273 dispatchDraw(canvas); 10274 } else { 10275 draw(canvas); 10276 } 10277 } finally { 10278 canvas.restoreToCount(restoreCount); 10279 canvas.onPostDraw(); 10280 10281 mDisplayList.end(); 10282 } 10283 } else { 10284 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10285 mPrivateFlags &= ~DIRTY_MASK; 10286 } 10287 10288 return mDisplayList; 10289 } 10290 10291 /** 10292 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 10293 * 10294 * @return A non-scaled bitmap representing this view or null if cache is disabled. 10295 * 10296 * @see #getDrawingCache(boolean) 10297 */ 10298 public Bitmap getDrawingCache() { 10299 return getDrawingCache(false); 10300 } 10301 10302 /** 10303 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 10304 * is null when caching is disabled. If caching is enabled and the cache is not ready, 10305 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 10306 * draw from the cache when the cache is enabled. To benefit from the cache, you must 10307 * request the drawing cache by calling this method and draw it on screen if the 10308 * returned bitmap is not null.</p> 10309 * 10310 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10311 * this method will create a bitmap of the same size as this view. Because this bitmap 10312 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10313 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10314 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10315 * size than the view. This implies that your application must be able to handle this 10316 * size.</p> 10317 * 10318 * @param autoScale Indicates whether the generated bitmap should be scaled based on 10319 * the current density of the screen when the application is in compatibility 10320 * mode. 10321 * 10322 * @return A bitmap representing this view or null if cache is disabled. 10323 * 10324 * @see #setDrawingCacheEnabled(boolean) 10325 * @see #isDrawingCacheEnabled() 10326 * @see #buildDrawingCache(boolean) 10327 * @see #destroyDrawingCache() 10328 */ 10329 public Bitmap getDrawingCache(boolean autoScale) { 10330 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 10331 return null; 10332 } 10333 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 10334 buildDrawingCache(autoScale); 10335 } 10336 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 10337 } 10338 10339 /** 10340 * <p>Frees the resources used by the drawing cache. If you call 10341 * {@link #buildDrawingCache()} manually without calling 10342 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10343 * should cleanup the cache with this method afterwards.</p> 10344 * 10345 * @see #setDrawingCacheEnabled(boolean) 10346 * @see #buildDrawingCache() 10347 * @see #getDrawingCache() 10348 */ 10349 public void destroyDrawingCache() { 10350 if (mDrawingCache != null) { 10351 mDrawingCache.recycle(); 10352 mDrawingCache = null; 10353 } 10354 if (mUnscaledDrawingCache != null) { 10355 mUnscaledDrawingCache.recycle(); 10356 mUnscaledDrawingCache = null; 10357 } 10358 } 10359 10360 /** 10361 * Setting a solid background color for the drawing cache's bitmaps will improve 10362 * performance and memory usage. Note, though that this should only be used if this 10363 * view will always be drawn on top of a solid color. 10364 * 10365 * @param color The background color to use for the drawing cache's bitmap 10366 * 10367 * @see #setDrawingCacheEnabled(boolean) 10368 * @see #buildDrawingCache() 10369 * @see #getDrawingCache() 10370 */ 10371 public void setDrawingCacheBackgroundColor(int color) { 10372 if (color != mDrawingCacheBackgroundColor) { 10373 mDrawingCacheBackgroundColor = color; 10374 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10375 } 10376 } 10377 10378 /** 10379 * @see #setDrawingCacheBackgroundColor(int) 10380 * 10381 * @return The background color to used for the drawing cache's bitmap 10382 */ 10383 public int getDrawingCacheBackgroundColor() { 10384 return mDrawingCacheBackgroundColor; 10385 } 10386 10387 /** 10388 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 10389 * 10390 * @see #buildDrawingCache(boolean) 10391 */ 10392 public void buildDrawingCache() { 10393 buildDrawingCache(false); 10394 } 10395 10396 /** 10397 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 10398 * 10399 * <p>If you call {@link #buildDrawingCache()} manually without calling 10400 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10401 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 10402 * 10403 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10404 * this method will create a bitmap of the same size as this view. Because this bitmap 10405 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10406 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10407 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10408 * size than the view. This implies that your application must be able to handle this 10409 * size.</p> 10410 * 10411 * <p>You should avoid calling this method when hardware acceleration is enabled. If 10412 * you do not need the drawing cache bitmap, calling this method will increase memory 10413 * usage and cause the view to be rendered in software once, thus negatively impacting 10414 * performance.</p> 10415 * 10416 * @see #getDrawingCache() 10417 * @see #destroyDrawingCache() 10418 */ 10419 public void buildDrawingCache(boolean autoScale) { 10420 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 10421 mDrawingCache == null : mUnscaledDrawingCache == null)) { 10422 mCachingFailed = false; 10423 10424 if (ViewDebug.TRACE_HIERARCHY) { 10425 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 10426 } 10427 10428 int width = mRight - mLeft; 10429 int height = mBottom - mTop; 10430 10431 final AttachInfo attachInfo = mAttachInfo; 10432 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 10433 10434 if (autoScale && scalingRequired) { 10435 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 10436 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 10437 } 10438 10439 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 10440 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 10441 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 10442 10443 if (width <= 0 || height <= 0 || 10444 // Projected bitmap size in bytes 10445 (width * height * (opaque && !use32BitCache ? 2 : 4) > 10446 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 10447 destroyDrawingCache(); 10448 mCachingFailed = true; 10449 return; 10450 } 10451 10452 boolean clear = true; 10453 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 10454 10455 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 10456 Bitmap.Config quality; 10457 if (!opaque) { 10458 // Never pick ARGB_4444 because it looks awful 10459 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 10460 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 10461 case DRAWING_CACHE_QUALITY_AUTO: 10462 quality = Bitmap.Config.ARGB_8888; 10463 break; 10464 case DRAWING_CACHE_QUALITY_LOW: 10465 quality = Bitmap.Config.ARGB_8888; 10466 break; 10467 case DRAWING_CACHE_QUALITY_HIGH: 10468 quality = Bitmap.Config.ARGB_8888; 10469 break; 10470 default: 10471 quality = Bitmap.Config.ARGB_8888; 10472 break; 10473 } 10474 } else { 10475 // Optimization for translucent windows 10476 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 10477 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 10478 } 10479 10480 // Try to cleanup memory 10481 if (bitmap != null) bitmap.recycle(); 10482 10483 try { 10484 bitmap = Bitmap.createBitmap(width, height, quality); 10485 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10486 if (autoScale) { 10487 mDrawingCache = bitmap; 10488 } else { 10489 mUnscaledDrawingCache = bitmap; 10490 } 10491 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 10492 } catch (OutOfMemoryError e) { 10493 // If there is not enough memory to create the bitmap cache, just 10494 // ignore the issue as bitmap caches are not required to draw the 10495 // view hierarchy 10496 if (autoScale) { 10497 mDrawingCache = null; 10498 } else { 10499 mUnscaledDrawingCache = null; 10500 } 10501 mCachingFailed = true; 10502 return; 10503 } 10504 10505 clear = drawingCacheBackgroundColor != 0; 10506 } 10507 10508 Canvas canvas; 10509 if (attachInfo != null) { 10510 canvas = attachInfo.mCanvas; 10511 if (canvas == null) { 10512 canvas = new Canvas(); 10513 } 10514 canvas.setBitmap(bitmap); 10515 // Temporarily clobber the cached Canvas in case one of our children 10516 // is also using a drawing cache. Without this, the children would 10517 // steal the canvas by attaching their own bitmap to it and bad, bad 10518 // thing would happen (invisible views, corrupted drawings, etc.) 10519 attachInfo.mCanvas = null; 10520 } else { 10521 // This case should hopefully never or seldom happen 10522 canvas = new Canvas(bitmap); 10523 } 10524 10525 if (clear) { 10526 bitmap.eraseColor(drawingCacheBackgroundColor); 10527 } 10528 10529 computeScroll(); 10530 final int restoreCount = canvas.save(); 10531 10532 if (autoScale && scalingRequired) { 10533 final float scale = attachInfo.mApplicationScale; 10534 canvas.scale(scale, scale); 10535 } 10536 10537 canvas.translate(-mScrollX, -mScrollY); 10538 10539 mPrivateFlags |= DRAWN; 10540 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 10541 mLayerType != LAYER_TYPE_NONE) { 10542 mPrivateFlags |= DRAWING_CACHE_VALID; 10543 } 10544 10545 // Fast path for layouts with no backgrounds 10546 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10547 if (ViewDebug.TRACE_HIERARCHY) { 10548 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10549 } 10550 mPrivateFlags &= ~DIRTY_MASK; 10551 dispatchDraw(canvas); 10552 } else { 10553 draw(canvas); 10554 } 10555 10556 canvas.restoreToCount(restoreCount); 10557 canvas.setBitmap(null); 10558 10559 if (attachInfo != null) { 10560 // Restore the cached Canvas for our siblings 10561 attachInfo.mCanvas = canvas; 10562 } 10563 } 10564 } 10565 10566 /** 10567 * Create a snapshot of the view into a bitmap. We should probably make 10568 * some form of this public, but should think about the API. 10569 */ 10570 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 10571 int width = mRight - mLeft; 10572 int height = mBottom - mTop; 10573 10574 final AttachInfo attachInfo = mAttachInfo; 10575 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 10576 width = (int) ((width * scale) + 0.5f); 10577 height = (int) ((height * scale) + 0.5f); 10578 10579 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 10580 if (bitmap == null) { 10581 throw new OutOfMemoryError(); 10582 } 10583 10584 Resources resources = getResources(); 10585 if (resources != null) { 10586 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 10587 } 10588 10589 Canvas canvas; 10590 if (attachInfo != null) { 10591 canvas = attachInfo.mCanvas; 10592 if (canvas == null) { 10593 canvas = new Canvas(); 10594 } 10595 canvas.setBitmap(bitmap); 10596 // Temporarily clobber the cached Canvas in case one of our children 10597 // is also using a drawing cache. Without this, the children would 10598 // steal the canvas by attaching their own bitmap to it and bad, bad 10599 // things would happen (invisible views, corrupted drawings, etc.) 10600 attachInfo.mCanvas = null; 10601 } else { 10602 // This case should hopefully never or seldom happen 10603 canvas = new Canvas(bitmap); 10604 } 10605 10606 if ((backgroundColor & 0xff000000) != 0) { 10607 bitmap.eraseColor(backgroundColor); 10608 } 10609 10610 computeScroll(); 10611 final int restoreCount = canvas.save(); 10612 canvas.scale(scale, scale); 10613 canvas.translate(-mScrollX, -mScrollY); 10614 10615 // Temporarily remove the dirty mask 10616 int flags = mPrivateFlags; 10617 mPrivateFlags &= ~DIRTY_MASK; 10618 10619 // Fast path for layouts with no backgrounds 10620 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10621 dispatchDraw(canvas); 10622 } else { 10623 draw(canvas); 10624 } 10625 10626 mPrivateFlags = flags; 10627 10628 canvas.restoreToCount(restoreCount); 10629 canvas.setBitmap(null); 10630 10631 if (attachInfo != null) { 10632 // Restore the cached Canvas for our siblings 10633 attachInfo.mCanvas = canvas; 10634 } 10635 10636 return bitmap; 10637 } 10638 10639 /** 10640 * Indicates whether this View is currently in edit mode. A View is usually 10641 * in edit mode when displayed within a developer tool. For instance, if 10642 * this View is being drawn by a visual user interface builder, this method 10643 * should return true. 10644 * 10645 * Subclasses should check the return value of this method to provide 10646 * different behaviors if their normal behavior might interfere with the 10647 * host environment. For instance: the class spawns a thread in its 10648 * constructor, the drawing code relies on device-specific features, etc. 10649 * 10650 * This method is usually checked in the drawing code of custom widgets. 10651 * 10652 * @return True if this View is in edit mode, false otherwise. 10653 */ 10654 public boolean isInEditMode() { 10655 return false; 10656 } 10657 10658 /** 10659 * If the View draws content inside its padding and enables fading edges, 10660 * it needs to support padding offsets. Padding offsets are added to the 10661 * fading edges to extend the length of the fade so that it covers pixels 10662 * drawn inside the padding. 10663 * 10664 * Subclasses of this class should override this method if they need 10665 * to draw content inside the padding. 10666 * 10667 * @return True if padding offset must be applied, false otherwise. 10668 * 10669 * @see #getLeftPaddingOffset() 10670 * @see #getRightPaddingOffset() 10671 * @see #getTopPaddingOffset() 10672 * @see #getBottomPaddingOffset() 10673 * 10674 * @since CURRENT 10675 */ 10676 protected boolean isPaddingOffsetRequired() { 10677 return false; 10678 } 10679 10680 /** 10681 * Amount by which to extend the left fading region. Called only when 10682 * {@link #isPaddingOffsetRequired()} returns true. 10683 * 10684 * @return The left padding offset in pixels. 10685 * 10686 * @see #isPaddingOffsetRequired() 10687 * 10688 * @since CURRENT 10689 */ 10690 protected int getLeftPaddingOffset() { 10691 return 0; 10692 } 10693 10694 /** 10695 * Amount by which to extend the right fading region. Called only when 10696 * {@link #isPaddingOffsetRequired()} returns true. 10697 * 10698 * @return The right padding offset in pixels. 10699 * 10700 * @see #isPaddingOffsetRequired() 10701 * 10702 * @since CURRENT 10703 */ 10704 protected int getRightPaddingOffset() { 10705 return 0; 10706 } 10707 10708 /** 10709 * Amount by which to extend the top fading region. Called only when 10710 * {@link #isPaddingOffsetRequired()} returns true. 10711 * 10712 * @return The top padding offset in pixels. 10713 * 10714 * @see #isPaddingOffsetRequired() 10715 * 10716 * @since CURRENT 10717 */ 10718 protected int getTopPaddingOffset() { 10719 return 0; 10720 } 10721 10722 /** 10723 * Amount by which to extend the bottom fading region. Called only when 10724 * {@link #isPaddingOffsetRequired()} returns true. 10725 * 10726 * @return The bottom padding offset in pixels. 10727 * 10728 * @see #isPaddingOffsetRequired() 10729 * 10730 * @since CURRENT 10731 */ 10732 protected int getBottomPaddingOffset() { 10733 return 0; 10734 } 10735 10736 /** 10737 * @hide 10738 * @param offsetRequired 10739 */ 10740 protected int getFadeTop(boolean offsetRequired) { 10741 int top = mPaddingTop; 10742 if (offsetRequired) top += getTopPaddingOffset(); 10743 return top; 10744 } 10745 10746 /** 10747 * @hide 10748 * @param offsetRequired 10749 */ 10750 protected int getFadeHeight(boolean offsetRequired) { 10751 int padding = mPaddingTop; 10752 if (offsetRequired) padding += getTopPaddingOffset(); 10753 return mBottom - mTop - mPaddingBottom - padding; 10754 } 10755 10756 /** 10757 * <p>Indicates whether this view is attached to an hardware accelerated 10758 * window or not.</p> 10759 * 10760 * <p>Even if this method returns true, it does not mean that every call 10761 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 10762 * accelerated {@link android.graphics.Canvas}. For instance, if this view 10763 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 10764 * window is hardware accelerated, 10765 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 10766 * return false, and this method will return true.</p> 10767 * 10768 * @return True if the view is attached to a window and the window is 10769 * hardware accelerated; false in any other case. 10770 */ 10771 public boolean isHardwareAccelerated() { 10772 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 10773 } 10774 10775 /** 10776 * Manually render this view (and all of its children) to the given Canvas. 10777 * The view must have already done a full layout before this function is 10778 * called. When implementing a view, implement 10779 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 10780 * If you do need to override this method, call the superclass version. 10781 * 10782 * @param canvas The Canvas to which the View is rendered. 10783 */ 10784 public void draw(Canvas canvas) { 10785 if (ViewDebug.TRACE_HIERARCHY) { 10786 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10787 } 10788 10789 final int privateFlags = mPrivateFlags; 10790 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 10791 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 10792 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 10793 10794 /* 10795 * Draw traversal performs several drawing steps which must be executed 10796 * in the appropriate order: 10797 * 10798 * 1. Draw the background 10799 * 2. If necessary, save the canvas' layers to prepare for fading 10800 * 3. Draw view's content 10801 * 4. Draw children 10802 * 5. If necessary, draw the fading edges and restore layers 10803 * 6. Draw decorations (scrollbars for instance) 10804 */ 10805 10806 // Step 1, draw the background, if needed 10807 int saveCount; 10808 10809 if (!dirtyOpaque) { 10810 final Drawable background = mBGDrawable; 10811 if (background != null) { 10812 final int scrollX = mScrollX; 10813 final int scrollY = mScrollY; 10814 10815 if (mBackgroundSizeChanged) { 10816 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 10817 mBackgroundSizeChanged = false; 10818 } 10819 10820 if ((scrollX | scrollY) == 0) { 10821 background.draw(canvas); 10822 } else { 10823 canvas.translate(scrollX, scrollY); 10824 background.draw(canvas); 10825 canvas.translate(-scrollX, -scrollY); 10826 } 10827 } 10828 } 10829 10830 // skip step 2 & 5 if possible (common case) 10831 final int viewFlags = mViewFlags; 10832 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 10833 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 10834 if (!verticalEdges && !horizontalEdges) { 10835 // Step 3, draw the content 10836 if (!dirtyOpaque) onDraw(canvas); 10837 10838 // Step 4, draw the children 10839 dispatchDraw(canvas); 10840 10841 // Step 6, draw decorations (scrollbars) 10842 onDrawScrollBars(canvas); 10843 10844 // we're done... 10845 return; 10846 } 10847 10848 /* 10849 * Here we do the full fledged routine... 10850 * (this is an uncommon case where speed matters less, 10851 * this is why we repeat some of the tests that have been 10852 * done above) 10853 */ 10854 10855 boolean drawTop = false; 10856 boolean drawBottom = false; 10857 boolean drawLeft = false; 10858 boolean drawRight = false; 10859 10860 float topFadeStrength = 0.0f; 10861 float bottomFadeStrength = 0.0f; 10862 float leftFadeStrength = 0.0f; 10863 float rightFadeStrength = 0.0f; 10864 10865 // Step 2, save the canvas' layers 10866 int paddingLeft = mPaddingLeft; 10867 10868 final boolean offsetRequired = isPaddingOffsetRequired(); 10869 if (offsetRequired) { 10870 paddingLeft += getLeftPaddingOffset(); 10871 } 10872 10873 int left = mScrollX + paddingLeft; 10874 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 10875 int top = mScrollY + getFadeTop(offsetRequired); 10876 int bottom = top + getFadeHeight(offsetRequired); 10877 10878 if (offsetRequired) { 10879 right += getRightPaddingOffset(); 10880 bottom += getBottomPaddingOffset(); 10881 } 10882 10883 final ScrollabilityCache scrollabilityCache = mScrollCache; 10884 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 10885 int length = (int) fadeHeight; 10886 10887 // clip the fade length if top and bottom fades overlap 10888 // overlapping fades produce odd-looking artifacts 10889 if (verticalEdges && (top + length > bottom - length)) { 10890 length = (bottom - top) / 2; 10891 } 10892 10893 // also clip horizontal fades if necessary 10894 if (horizontalEdges && (left + length > right - length)) { 10895 length = (right - left) / 2; 10896 } 10897 10898 if (verticalEdges) { 10899 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 10900 drawTop = topFadeStrength * fadeHeight > 1.0f; 10901 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 10902 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 10903 } 10904 10905 if (horizontalEdges) { 10906 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 10907 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 10908 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 10909 drawRight = rightFadeStrength * fadeHeight > 1.0f; 10910 } 10911 10912 saveCount = canvas.getSaveCount(); 10913 10914 int solidColor = getSolidColor(); 10915 if (solidColor == 0) { 10916 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 10917 10918 if (drawTop) { 10919 canvas.saveLayer(left, top, right, top + length, null, flags); 10920 } 10921 10922 if (drawBottom) { 10923 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 10924 } 10925 10926 if (drawLeft) { 10927 canvas.saveLayer(left, top, left + length, bottom, null, flags); 10928 } 10929 10930 if (drawRight) { 10931 canvas.saveLayer(right - length, top, right, bottom, null, flags); 10932 } 10933 } else { 10934 scrollabilityCache.setFadeColor(solidColor); 10935 } 10936 10937 // Step 3, draw the content 10938 if (!dirtyOpaque) onDraw(canvas); 10939 10940 // Step 4, draw the children 10941 dispatchDraw(canvas); 10942 10943 // Step 5, draw the fade effect and restore layers 10944 final Paint p = scrollabilityCache.paint; 10945 final Matrix matrix = scrollabilityCache.matrix; 10946 final Shader fade = scrollabilityCache.shader; 10947 10948 if (drawTop) { 10949 matrix.setScale(1, fadeHeight * topFadeStrength); 10950 matrix.postTranslate(left, top); 10951 fade.setLocalMatrix(matrix); 10952 canvas.drawRect(left, top, right, top + length, p); 10953 } 10954 10955 if (drawBottom) { 10956 matrix.setScale(1, fadeHeight * bottomFadeStrength); 10957 matrix.postRotate(180); 10958 matrix.postTranslate(left, bottom); 10959 fade.setLocalMatrix(matrix); 10960 canvas.drawRect(left, bottom - length, right, bottom, p); 10961 } 10962 10963 if (drawLeft) { 10964 matrix.setScale(1, fadeHeight * leftFadeStrength); 10965 matrix.postRotate(-90); 10966 matrix.postTranslate(left, top); 10967 fade.setLocalMatrix(matrix); 10968 canvas.drawRect(left, top, left + length, bottom, p); 10969 } 10970 10971 if (drawRight) { 10972 matrix.setScale(1, fadeHeight * rightFadeStrength); 10973 matrix.postRotate(90); 10974 matrix.postTranslate(right, top); 10975 fade.setLocalMatrix(matrix); 10976 canvas.drawRect(right - length, top, right, bottom, p); 10977 } 10978 10979 canvas.restoreToCount(saveCount); 10980 10981 // Step 6, draw decorations (scrollbars) 10982 onDrawScrollBars(canvas); 10983 } 10984 10985 /** 10986 * Override this if your view is known to always be drawn on top of a solid color background, 10987 * and needs to draw fading edges. Returning a non-zero color enables the view system to 10988 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 10989 * should be set to 0xFF. 10990 * 10991 * @see #setVerticalFadingEdgeEnabled(boolean) 10992 * @see #setHorizontalFadingEdgeEnabled(boolean) 10993 * 10994 * @return The known solid color background for this view, or 0 if the color may vary 10995 */ 10996 @ViewDebug.ExportedProperty(category = "drawing") 10997 public int getSolidColor() { 10998 return 0; 10999 } 11000 11001 /** 11002 * Build a human readable string representation of the specified view flags. 11003 * 11004 * @param flags the view flags to convert to a string 11005 * @return a String representing the supplied flags 11006 */ 11007 private static String printFlags(int flags) { 11008 String output = ""; 11009 int numFlags = 0; 11010 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 11011 output += "TAKES_FOCUS"; 11012 numFlags++; 11013 } 11014 11015 switch (flags & VISIBILITY_MASK) { 11016 case INVISIBLE: 11017 if (numFlags > 0) { 11018 output += " "; 11019 } 11020 output += "INVISIBLE"; 11021 // USELESS HERE numFlags++; 11022 break; 11023 case GONE: 11024 if (numFlags > 0) { 11025 output += " "; 11026 } 11027 output += "GONE"; 11028 // USELESS HERE numFlags++; 11029 break; 11030 default: 11031 break; 11032 } 11033 return output; 11034 } 11035 11036 /** 11037 * Build a human readable string representation of the specified private 11038 * view flags. 11039 * 11040 * @param privateFlags the private view flags to convert to a string 11041 * @return a String representing the supplied flags 11042 */ 11043 private static String printPrivateFlags(int privateFlags) { 11044 String output = ""; 11045 int numFlags = 0; 11046 11047 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 11048 output += "WANTS_FOCUS"; 11049 numFlags++; 11050 } 11051 11052 if ((privateFlags & FOCUSED) == FOCUSED) { 11053 if (numFlags > 0) { 11054 output += " "; 11055 } 11056 output += "FOCUSED"; 11057 numFlags++; 11058 } 11059 11060 if ((privateFlags & SELECTED) == SELECTED) { 11061 if (numFlags > 0) { 11062 output += " "; 11063 } 11064 output += "SELECTED"; 11065 numFlags++; 11066 } 11067 11068 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 11069 if (numFlags > 0) { 11070 output += " "; 11071 } 11072 output += "IS_ROOT_NAMESPACE"; 11073 numFlags++; 11074 } 11075 11076 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 11077 if (numFlags > 0) { 11078 output += " "; 11079 } 11080 output += "HAS_BOUNDS"; 11081 numFlags++; 11082 } 11083 11084 if ((privateFlags & DRAWN) == DRAWN) { 11085 if (numFlags > 0) { 11086 output += " "; 11087 } 11088 output += "DRAWN"; 11089 // USELESS HERE numFlags++; 11090 } 11091 return output; 11092 } 11093 11094 /** 11095 * <p>Indicates whether or not this view's layout will be requested during 11096 * the next hierarchy layout pass.</p> 11097 * 11098 * @return true if the layout will be forced during next layout pass 11099 */ 11100 public boolean isLayoutRequested() { 11101 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 11102 } 11103 11104 /** 11105 * Assign a size and position to a view and all of its 11106 * descendants 11107 * 11108 * <p>This is the second phase of the layout mechanism. 11109 * (The first is measuring). In this phase, each parent calls 11110 * layout on all of its children to position them. 11111 * This is typically done using the child measurements 11112 * that were stored in the measure pass().</p> 11113 * 11114 * <p>Derived classes should not override this method. 11115 * Derived classes with children should override 11116 * onLayout. In that method, they should 11117 * call layout on each of their children.</p> 11118 * 11119 * @param l Left position, relative to parent 11120 * @param t Top position, relative to parent 11121 * @param r Right position, relative to parent 11122 * @param b Bottom position, relative to parent 11123 */ 11124 @SuppressWarnings({"unchecked"}) 11125 public void layout(int l, int t, int r, int b) { 11126 int oldL = mLeft; 11127 int oldT = mTop; 11128 int oldB = mBottom; 11129 int oldR = mRight; 11130 boolean changed = setFrame(l, t, r, b); 11131 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 11132 if (ViewDebug.TRACE_HIERARCHY) { 11133 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 11134 } 11135 11136 onLayout(changed, l, t, r, b); 11137 mPrivateFlags &= ~LAYOUT_REQUIRED; 11138 11139 if (mOnLayoutChangeListeners != null) { 11140 ArrayList<OnLayoutChangeListener> listenersCopy = 11141 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 11142 int numListeners = listenersCopy.size(); 11143 for (int i = 0; i < numListeners; ++i) { 11144 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 11145 } 11146 } 11147 } 11148 mPrivateFlags &= ~FORCE_LAYOUT; 11149 } 11150 11151 /** 11152 * Called from layout when this view should 11153 * assign a size and position to each of its children. 11154 * 11155 * Derived classes with children should override 11156 * this method and call layout on each of 11157 * their children. 11158 * @param changed This is a new size or position for this view 11159 * @param left Left position, relative to parent 11160 * @param top Top position, relative to parent 11161 * @param right Right position, relative to parent 11162 * @param bottom Bottom position, relative to parent 11163 */ 11164 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 11165 } 11166 11167 /** 11168 * Assign a size and position to this view. 11169 * 11170 * This is called from layout. 11171 * 11172 * @param left Left position, relative to parent 11173 * @param top Top position, relative to parent 11174 * @param right Right position, relative to parent 11175 * @param bottom Bottom position, relative to parent 11176 * @return true if the new size and position are different than the 11177 * previous ones 11178 * {@hide} 11179 */ 11180 protected boolean setFrame(int left, int top, int right, int bottom) { 11181 boolean changed = false; 11182 11183 if (DBG) { 11184 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 11185 + right + "," + bottom + ")"); 11186 } 11187 11188 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 11189 changed = true; 11190 11191 // Remember our drawn bit 11192 int drawn = mPrivateFlags & DRAWN; 11193 11194 int oldWidth = mRight - mLeft; 11195 int oldHeight = mBottom - mTop; 11196 int newWidth = right - left; 11197 int newHeight = bottom - top; 11198 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 11199 11200 // Invalidate our old position 11201 invalidate(sizeChanged); 11202 11203 mLeft = left; 11204 mTop = top; 11205 mRight = right; 11206 mBottom = bottom; 11207 11208 mPrivateFlags |= HAS_BOUNDS; 11209 11210 11211 if (sizeChanged) { 11212 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 11213 // A change in dimension means an auto-centered pivot point changes, too 11214 if (mTransformationInfo != null) { 11215 mTransformationInfo.mMatrixDirty = true; 11216 } 11217 } 11218 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 11219 } 11220 11221 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 11222 // If we are visible, force the DRAWN bit to on so that 11223 // this invalidate will go through (at least to our parent). 11224 // This is because someone may have invalidated this view 11225 // before this call to setFrame came in, thereby clearing 11226 // the DRAWN bit. 11227 mPrivateFlags |= DRAWN; 11228 invalidate(sizeChanged); 11229 // parent display list may need to be recreated based on a change in the bounds 11230 // of any child 11231 invalidateParentCaches(); 11232 } 11233 11234 // Reset drawn bit to original value (invalidate turns it off) 11235 mPrivateFlags |= drawn; 11236 11237 mBackgroundSizeChanged = true; 11238 } 11239 return changed; 11240 } 11241 11242 /** 11243 * Finalize inflating a view from XML. This is called as the last phase 11244 * of inflation, after all child views have been added. 11245 * 11246 * <p>Even if the subclass overrides onFinishInflate, they should always be 11247 * sure to call the super method, so that we get called. 11248 */ 11249 protected void onFinishInflate() { 11250 } 11251 11252 /** 11253 * Returns the resources associated with this view. 11254 * 11255 * @return Resources object. 11256 */ 11257 public Resources getResources() { 11258 return mResources; 11259 } 11260 11261 /** 11262 * Invalidates the specified Drawable. 11263 * 11264 * @param drawable the drawable to invalidate 11265 */ 11266 public void invalidateDrawable(Drawable drawable) { 11267 if (verifyDrawable(drawable)) { 11268 final Rect dirty = drawable.getBounds(); 11269 final int scrollX = mScrollX; 11270 final int scrollY = mScrollY; 11271 11272 invalidate(dirty.left + scrollX, dirty.top + scrollY, 11273 dirty.right + scrollX, dirty.bottom + scrollY); 11274 } 11275 } 11276 11277 /** 11278 * Schedules an action on a drawable to occur at a specified time. 11279 * 11280 * @param who the recipient of the action 11281 * @param what the action to run on the drawable 11282 * @param when the time at which the action must occur. Uses the 11283 * {@link SystemClock#uptimeMillis} timebase. 11284 */ 11285 public void scheduleDrawable(Drawable who, Runnable what, long when) { 11286 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 11287 mAttachInfo.mHandler.postAtTime(what, who, when); 11288 } 11289 } 11290 11291 /** 11292 * Cancels a scheduled action on a drawable. 11293 * 11294 * @param who the recipient of the action 11295 * @param what the action to cancel 11296 */ 11297 public void unscheduleDrawable(Drawable who, Runnable what) { 11298 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 11299 mAttachInfo.mHandler.removeCallbacks(what, who); 11300 } 11301 } 11302 11303 /** 11304 * Unschedule any events associated with the given Drawable. This can be 11305 * used when selecting a new Drawable into a view, so that the previous 11306 * one is completely unscheduled. 11307 * 11308 * @param who The Drawable to unschedule. 11309 * 11310 * @see #drawableStateChanged 11311 */ 11312 public void unscheduleDrawable(Drawable who) { 11313 if (mAttachInfo != null) { 11314 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 11315 } 11316 } 11317 11318 /** 11319 * Return the layout direction of a given Drawable. 11320 * 11321 * @param who the Drawable to query 11322 * 11323 * @hide 11324 */ 11325 public int getResolvedLayoutDirection(Drawable who) { 11326 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 11327 } 11328 11329 /** 11330 * If your view subclass is displaying its own Drawable objects, it should 11331 * override this function and return true for any Drawable it is 11332 * displaying. This allows animations for those drawables to be 11333 * scheduled. 11334 * 11335 * <p>Be sure to call through to the super class when overriding this 11336 * function. 11337 * 11338 * @param who The Drawable to verify. Return true if it is one you are 11339 * displaying, else return the result of calling through to the 11340 * super class. 11341 * 11342 * @return boolean If true than the Drawable is being displayed in the 11343 * view; else false and it is not allowed to animate. 11344 * 11345 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 11346 * @see #drawableStateChanged() 11347 */ 11348 protected boolean verifyDrawable(Drawable who) { 11349 return who == mBGDrawable; 11350 } 11351 11352 /** 11353 * This function is called whenever the state of the view changes in such 11354 * a way that it impacts the state of drawables being shown. 11355 * 11356 * <p>Be sure to call through to the superclass when overriding this 11357 * function. 11358 * 11359 * @see Drawable#setState(int[]) 11360 */ 11361 protected void drawableStateChanged() { 11362 Drawable d = mBGDrawable; 11363 if (d != null && d.isStateful()) { 11364 d.setState(getDrawableState()); 11365 } 11366 } 11367 11368 /** 11369 * Call this to force a view to update its drawable state. This will cause 11370 * drawableStateChanged to be called on this view. Views that are interested 11371 * in the new state should call getDrawableState. 11372 * 11373 * @see #drawableStateChanged 11374 * @see #getDrawableState 11375 */ 11376 public void refreshDrawableState() { 11377 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11378 drawableStateChanged(); 11379 11380 ViewParent parent = mParent; 11381 if (parent != null) { 11382 parent.childDrawableStateChanged(this); 11383 } 11384 } 11385 11386 /** 11387 * Return an array of resource IDs of the drawable states representing the 11388 * current state of the view. 11389 * 11390 * @return The current drawable state 11391 * 11392 * @see Drawable#setState(int[]) 11393 * @see #drawableStateChanged() 11394 * @see #onCreateDrawableState(int) 11395 */ 11396 public final int[] getDrawableState() { 11397 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 11398 return mDrawableState; 11399 } else { 11400 mDrawableState = onCreateDrawableState(0); 11401 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 11402 return mDrawableState; 11403 } 11404 } 11405 11406 /** 11407 * Generate the new {@link android.graphics.drawable.Drawable} state for 11408 * this view. This is called by the view 11409 * system when the cached Drawable state is determined to be invalid. To 11410 * retrieve the current state, you should use {@link #getDrawableState}. 11411 * 11412 * @param extraSpace if non-zero, this is the number of extra entries you 11413 * would like in the returned array in which you can place your own 11414 * states. 11415 * 11416 * @return Returns an array holding the current {@link Drawable} state of 11417 * the view. 11418 * 11419 * @see #mergeDrawableStates(int[], int[]) 11420 */ 11421 protected int[] onCreateDrawableState(int extraSpace) { 11422 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 11423 mParent instanceof View) { 11424 return ((View) mParent).onCreateDrawableState(extraSpace); 11425 } 11426 11427 int[] drawableState; 11428 11429 int privateFlags = mPrivateFlags; 11430 11431 int viewStateIndex = 0; 11432 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 11433 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 11434 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 11435 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 11436 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 11437 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 11438 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 11439 HardwareRenderer.isAvailable()) { 11440 // This is set if HW acceleration is requested, even if the current 11441 // process doesn't allow it. This is just to allow app preview 11442 // windows to better match their app. 11443 viewStateIndex |= VIEW_STATE_ACCELERATED; 11444 } 11445 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 11446 11447 final int privateFlags2 = mPrivateFlags2; 11448 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 11449 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 11450 11451 drawableState = VIEW_STATE_SETS[viewStateIndex]; 11452 11453 //noinspection ConstantIfStatement 11454 if (false) { 11455 Log.i("View", "drawableStateIndex=" + viewStateIndex); 11456 Log.i("View", toString() 11457 + " pressed=" + ((privateFlags & PRESSED) != 0) 11458 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 11459 + " fo=" + hasFocus() 11460 + " sl=" + ((privateFlags & SELECTED) != 0) 11461 + " wf=" + hasWindowFocus() 11462 + ": " + Arrays.toString(drawableState)); 11463 } 11464 11465 if (extraSpace == 0) { 11466 return drawableState; 11467 } 11468 11469 final int[] fullState; 11470 if (drawableState != null) { 11471 fullState = new int[drawableState.length + extraSpace]; 11472 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 11473 } else { 11474 fullState = new int[extraSpace]; 11475 } 11476 11477 return fullState; 11478 } 11479 11480 /** 11481 * Merge your own state values in <var>additionalState</var> into the base 11482 * state values <var>baseState</var> that were returned by 11483 * {@link #onCreateDrawableState(int)}. 11484 * 11485 * @param baseState The base state values returned by 11486 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 11487 * own additional state values. 11488 * 11489 * @param additionalState The additional state values you would like 11490 * added to <var>baseState</var>; this array is not modified. 11491 * 11492 * @return As a convenience, the <var>baseState</var> array you originally 11493 * passed into the function is returned. 11494 * 11495 * @see #onCreateDrawableState(int) 11496 */ 11497 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 11498 final int N = baseState.length; 11499 int i = N - 1; 11500 while (i >= 0 && baseState[i] == 0) { 11501 i--; 11502 } 11503 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 11504 return baseState; 11505 } 11506 11507 /** 11508 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 11509 * on all Drawable objects associated with this view. 11510 */ 11511 public void jumpDrawablesToCurrentState() { 11512 if (mBGDrawable != null) { 11513 mBGDrawable.jumpToCurrentState(); 11514 } 11515 } 11516 11517 /** 11518 * Sets the background color for this view. 11519 * @param color the color of the background 11520 */ 11521 @RemotableViewMethod 11522 public void setBackgroundColor(int color) { 11523 if (mBGDrawable instanceof ColorDrawable) { 11524 ((ColorDrawable) mBGDrawable).setColor(color); 11525 } else { 11526 setBackgroundDrawable(new ColorDrawable(color)); 11527 } 11528 } 11529 11530 /** 11531 * Set the background to a given resource. The resource should refer to 11532 * a Drawable object or 0 to remove the background. 11533 * @param resid The identifier of the resource. 11534 * @attr ref android.R.styleable#View_background 11535 */ 11536 @RemotableViewMethod 11537 public void setBackgroundResource(int resid) { 11538 if (resid != 0 && resid == mBackgroundResource) { 11539 return; 11540 } 11541 11542 Drawable d= null; 11543 if (resid != 0) { 11544 d = mResources.getDrawable(resid); 11545 } 11546 setBackgroundDrawable(d); 11547 11548 mBackgroundResource = resid; 11549 } 11550 11551 /** 11552 * Set the background to a given Drawable, or remove the background. If the 11553 * background has padding, this View's padding is set to the background's 11554 * padding. However, when a background is removed, this View's padding isn't 11555 * touched. If setting the padding is desired, please use 11556 * {@link #setPadding(int, int, int, int)}. 11557 * 11558 * @param d The Drawable to use as the background, or null to remove the 11559 * background 11560 */ 11561 public void setBackgroundDrawable(Drawable d) { 11562 if (d == mBGDrawable) { 11563 return; 11564 } 11565 11566 boolean requestLayout = false; 11567 11568 mBackgroundResource = 0; 11569 11570 /* 11571 * Regardless of whether we're setting a new background or not, we want 11572 * to clear the previous drawable. 11573 */ 11574 if (mBGDrawable != null) { 11575 mBGDrawable.setCallback(null); 11576 unscheduleDrawable(mBGDrawable); 11577 } 11578 11579 if (d != null) { 11580 Rect padding = sThreadLocal.get(); 11581 if (padding == null) { 11582 padding = new Rect(); 11583 sThreadLocal.set(padding); 11584 } 11585 if (d.getPadding(padding)) { 11586 switch (d.getResolvedLayoutDirectionSelf()) { 11587 case LAYOUT_DIRECTION_RTL: 11588 setPadding(padding.right, padding.top, padding.left, padding.bottom); 11589 break; 11590 case LAYOUT_DIRECTION_LTR: 11591 default: 11592 setPadding(padding.left, padding.top, padding.right, padding.bottom); 11593 } 11594 } 11595 11596 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 11597 // if it has a different minimum size, we should layout again 11598 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 11599 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 11600 requestLayout = true; 11601 } 11602 11603 d.setCallback(this); 11604 if (d.isStateful()) { 11605 d.setState(getDrawableState()); 11606 } 11607 d.setVisible(getVisibility() == VISIBLE, false); 11608 mBGDrawable = d; 11609 11610 if ((mPrivateFlags & SKIP_DRAW) != 0) { 11611 mPrivateFlags &= ~SKIP_DRAW; 11612 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 11613 requestLayout = true; 11614 } 11615 } else { 11616 /* Remove the background */ 11617 mBGDrawable = null; 11618 11619 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 11620 /* 11621 * This view ONLY drew the background before and we're removing 11622 * the background, so now it won't draw anything 11623 * (hence we SKIP_DRAW) 11624 */ 11625 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 11626 mPrivateFlags |= SKIP_DRAW; 11627 } 11628 11629 /* 11630 * When the background is set, we try to apply its padding to this 11631 * View. When the background is removed, we don't touch this View's 11632 * padding. This is noted in the Javadocs. Hence, we don't need to 11633 * requestLayout(), the invalidate() below is sufficient. 11634 */ 11635 11636 // The old background's minimum size could have affected this 11637 // View's layout, so let's requestLayout 11638 requestLayout = true; 11639 } 11640 11641 computeOpaqueFlags(); 11642 11643 if (requestLayout) { 11644 requestLayout(); 11645 } 11646 11647 mBackgroundSizeChanged = true; 11648 invalidate(true); 11649 } 11650 11651 /** 11652 * Gets the background drawable 11653 * @return The drawable used as the background for this view, if any. 11654 */ 11655 public Drawable getBackground() { 11656 return mBGDrawable; 11657 } 11658 11659 /** 11660 * Sets the padding. The view may add on the space required to display 11661 * the scrollbars, depending on the style and visibility of the scrollbars. 11662 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 11663 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 11664 * from the values set in this call. 11665 * 11666 * @attr ref android.R.styleable#View_padding 11667 * @attr ref android.R.styleable#View_paddingBottom 11668 * @attr ref android.R.styleable#View_paddingLeft 11669 * @attr ref android.R.styleable#View_paddingRight 11670 * @attr ref android.R.styleable#View_paddingTop 11671 * @param left the left padding in pixels 11672 * @param top the top padding in pixels 11673 * @param right the right padding in pixels 11674 * @param bottom the bottom padding in pixels 11675 */ 11676 public void setPadding(int left, int top, int right, int bottom) { 11677 boolean changed = false; 11678 11679 mUserPaddingRelative = false; 11680 11681 mUserPaddingLeft = left; 11682 mUserPaddingRight = right; 11683 mUserPaddingBottom = bottom; 11684 11685 final int viewFlags = mViewFlags; 11686 11687 // Common case is there are no scroll bars. 11688 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 11689 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 11690 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 11691 ? 0 : getVerticalScrollbarWidth(); 11692 switch (mVerticalScrollbarPosition) { 11693 case SCROLLBAR_POSITION_DEFAULT: 11694 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11695 left += offset; 11696 } else { 11697 right += offset; 11698 } 11699 break; 11700 case SCROLLBAR_POSITION_RIGHT: 11701 right += offset; 11702 break; 11703 case SCROLLBAR_POSITION_LEFT: 11704 left += offset; 11705 break; 11706 } 11707 } 11708 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 11709 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 11710 ? 0 : getHorizontalScrollbarHeight(); 11711 } 11712 } 11713 11714 if (mPaddingLeft != left) { 11715 changed = true; 11716 mPaddingLeft = left; 11717 } 11718 if (mPaddingTop != top) { 11719 changed = true; 11720 mPaddingTop = top; 11721 } 11722 if (mPaddingRight != right) { 11723 changed = true; 11724 mPaddingRight = right; 11725 } 11726 if (mPaddingBottom != bottom) { 11727 changed = true; 11728 mPaddingBottom = bottom; 11729 } 11730 11731 if (changed) { 11732 requestLayout(); 11733 } 11734 } 11735 11736 /** 11737 * Sets the relative padding. The view may add on the space required to display 11738 * the scrollbars, depending on the style and visibility of the scrollbars. 11739 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 11740 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 11741 * from the values set in this call. 11742 * 11743 * @attr ref android.R.styleable#View_padding 11744 * @attr ref android.R.styleable#View_paddingBottom 11745 * @attr ref android.R.styleable#View_paddingStart 11746 * @attr ref android.R.styleable#View_paddingEnd 11747 * @attr ref android.R.styleable#View_paddingTop 11748 * @param start the start padding in pixels 11749 * @param top the top padding in pixels 11750 * @param end the end padding in pixels 11751 * @param bottom the bottom padding in pixels 11752 * 11753 * @hide 11754 */ 11755 public void setPaddingRelative(int start, int top, int end, int bottom) { 11756 mUserPaddingRelative = true; 11757 11758 mUserPaddingStart = start; 11759 mUserPaddingEnd = end; 11760 11761 switch(getResolvedLayoutDirection()) { 11762 case LAYOUT_DIRECTION_RTL: 11763 setPadding(end, top, start, bottom); 11764 break; 11765 case LAYOUT_DIRECTION_LTR: 11766 default: 11767 setPadding(start, top, end, bottom); 11768 } 11769 } 11770 11771 /** 11772 * Returns the top padding of this view. 11773 * 11774 * @return the top padding in pixels 11775 */ 11776 public int getPaddingTop() { 11777 return mPaddingTop; 11778 } 11779 11780 /** 11781 * Returns the bottom padding of this view. If there are inset and enabled 11782 * scrollbars, this value may include the space required to display the 11783 * scrollbars as well. 11784 * 11785 * @return the bottom padding in pixels 11786 */ 11787 public int getPaddingBottom() { 11788 return mPaddingBottom; 11789 } 11790 11791 /** 11792 * Returns the left padding of this view. If there are inset and enabled 11793 * scrollbars, this value may include the space required to display the 11794 * scrollbars as well. 11795 * 11796 * @return the left padding in pixels 11797 */ 11798 public int getPaddingLeft() { 11799 return mPaddingLeft; 11800 } 11801 11802 /** 11803 * Returns the start padding of this view. If there are inset and enabled 11804 * scrollbars, this value may include the space required to display the 11805 * scrollbars as well. 11806 * 11807 * @return the start padding in pixels 11808 * 11809 * @hide 11810 */ 11811 public int getPaddingStart() { 11812 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11813 mPaddingRight : mPaddingLeft; 11814 } 11815 11816 /** 11817 * Returns the right padding of this view. If there are inset and enabled 11818 * scrollbars, this value may include the space required to display the 11819 * scrollbars as well. 11820 * 11821 * @return the right padding in pixels 11822 */ 11823 public int getPaddingRight() { 11824 return mPaddingRight; 11825 } 11826 11827 /** 11828 * Returns the end padding of this view. If there are inset and enabled 11829 * scrollbars, this value may include the space required to display the 11830 * scrollbars as well. 11831 * 11832 * @return the end padding in pixels 11833 * 11834 * @hide 11835 */ 11836 public int getPaddingEnd() { 11837 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11838 mPaddingLeft : mPaddingRight; 11839 } 11840 11841 /** 11842 * Return if the padding as been set thru relative values 11843 * {@link #setPaddingRelative(int, int, int, int)} or thru 11844 * @attr ref android.R.styleable#View_paddingStart or 11845 * @attr ref android.R.styleable#View_paddingEnd 11846 * 11847 * @return true if the padding is relative or false if it is not. 11848 * 11849 * @hide 11850 */ 11851 public boolean isPaddingRelative() { 11852 return mUserPaddingRelative; 11853 } 11854 11855 /** 11856 * Changes the selection state of this view. A view can be selected or not. 11857 * Note that selection is not the same as focus. Views are typically 11858 * selected in the context of an AdapterView like ListView or GridView; 11859 * the selected view is the view that is highlighted. 11860 * 11861 * @param selected true if the view must be selected, false otherwise 11862 */ 11863 public void setSelected(boolean selected) { 11864 if (((mPrivateFlags & SELECTED) != 0) != selected) { 11865 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 11866 if (!selected) resetPressedState(); 11867 invalidate(true); 11868 refreshDrawableState(); 11869 dispatchSetSelected(selected); 11870 } 11871 } 11872 11873 /** 11874 * Dispatch setSelected to all of this View's children. 11875 * 11876 * @see #setSelected(boolean) 11877 * 11878 * @param selected The new selected state 11879 */ 11880 protected void dispatchSetSelected(boolean selected) { 11881 } 11882 11883 /** 11884 * Indicates the selection state of this view. 11885 * 11886 * @return true if the view is selected, false otherwise 11887 */ 11888 @ViewDebug.ExportedProperty 11889 public boolean isSelected() { 11890 return (mPrivateFlags & SELECTED) != 0; 11891 } 11892 11893 /** 11894 * Changes the activated state of this view. A view can be activated or not. 11895 * Note that activation is not the same as selection. Selection is 11896 * a transient property, representing the view (hierarchy) the user is 11897 * currently interacting with. Activation is a longer-term state that the 11898 * user can move views in and out of. For example, in a list view with 11899 * single or multiple selection enabled, the views in the current selection 11900 * set are activated. (Um, yeah, we are deeply sorry about the terminology 11901 * here.) The activated state is propagated down to children of the view it 11902 * is set on. 11903 * 11904 * @param activated true if the view must be activated, false otherwise 11905 */ 11906 public void setActivated(boolean activated) { 11907 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 11908 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 11909 invalidate(true); 11910 refreshDrawableState(); 11911 dispatchSetActivated(activated); 11912 } 11913 } 11914 11915 /** 11916 * Dispatch setActivated to all of this View's children. 11917 * 11918 * @see #setActivated(boolean) 11919 * 11920 * @param activated The new activated state 11921 */ 11922 protected void dispatchSetActivated(boolean activated) { 11923 } 11924 11925 /** 11926 * Indicates the activation state of this view. 11927 * 11928 * @return true if the view is activated, false otherwise 11929 */ 11930 @ViewDebug.ExportedProperty 11931 public boolean isActivated() { 11932 return (mPrivateFlags & ACTIVATED) != 0; 11933 } 11934 11935 /** 11936 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 11937 * observer can be used to get notifications when global events, like 11938 * layout, happen. 11939 * 11940 * The returned ViewTreeObserver observer is not guaranteed to remain 11941 * valid for the lifetime of this View. If the caller of this method keeps 11942 * a long-lived reference to ViewTreeObserver, it should always check for 11943 * the return value of {@link ViewTreeObserver#isAlive()}. 11944 * 11945 * @return The ViewTreeObserver for this view's hierarchy. 11946 */ 11947 public ViewTreeObserver getViewTreeObserver() { 11948 if (mAttachInfo != null) { 11949 return mAttachInfo.mTreeObserver; 11950 } 11951 if (mFloatingTreeObserver == null) { 11952 mFloatingTreeObserver = new ViewTreeObserver(); 11953 } 11954 return mFloatingTreeObserver; 11955 } 11956 11957 /** 11958 * <p>Finds the topmost view in the current view hierarchy.</p> 11959 * 11960 * @return the topmost view containing this view 11961 */ 11962 public View getRootView() { 11963 if (mAttachInfo != null) { 11964 final View v = mAttachInfo.mRootView; 11965 if (v != null) { 11966 return v; 11967 } 11968 } 11969 11970 View parent = this; 11971 11972 while (parent.mParent != null && parent.mParent instanceof View) { 11973 parent = (View) parent.mParent; 11974 } 11975 11976 return parent; 11977 } 11978 11979 /** 11980 * <p>Computes the coordinates of this view on the screen. The argument 11981 * must be an array of two integers. After the method returns, the array 11982 * contains the x and y location in that order.</p> 11983 * 11984 * @param location an array of two integers in which to hold the coordinates 11985 */ 11986 public void getLocationOnScreen(int[] location) { 11987 getLocationInWindow(location); 11988 11989 final AttachInfo info = mAttachInfo; 11990 if (info != null) { 11991 location[0] += info.mWindowLeft; 11992 location[1] += info.mWindowTop; 11993 } 11994 } 11995 11996 /** 11997 * <p>Computes the coordinates of this view in its window. The argument 11998 * must be an array of two integers. After the method returns, the array 11999 * contains the x and y location in that order.</p> 12000 * 12001 * @param location an array of two integers in which to hold the coordinates 12002 */ 12003 public void getLocationInWindow(int[] location) { 12004 if (location == null || location.length < 2) { 12005 throw new IllegalArgumentException("location must be an array of " 12006 + "two integers"); 12007 } 12008 12009 location[0] = mLeft; 12010 location[1] = mTop; 12011 if (mTransformationInfo != null) { 12012 location[0] += (int) (mTransformationInfo.mTranslationX + 0.5f); 12013 location[1] += (int) (mTransformationInfo.mTranslationY + 0.5f); 12014 } 12015 12016 ViewParent viewParent = mParent; 12017 while (viewParent instanceof View) { 12018 final View view = (View)viewParent; 12019 location[0] += view.mLeft - view.mScrollX; 12020 location[1] += view.mTop - view.mScrollY; 12021 if (view.mTransformationInfo != null) { 12022 location[0] += (int) (view.mTransformationInfo.mTranslationX + 0.5f); 12023 location[1] += (int) (view.mTransformationInfo.mTranslationY + 0.5f); 12024 } 12025 viewParent = view.mParent; 12026 } 12027 12028 if (viewParent instanceof ViewRootImpl) { 12029 // *cough* 12030 final ViewRootImpl vr = (ViewRootImpl)viewParent; 12031 location[1] -= vr.mCurScrollY; 12032 } 12033 } 12034 12035 /** 12036 * {@hide} 12037 * @param id the id of the view to be found 12038 * @return the view of the specified id, null if cannot be found 12039 */ 12040 protected View findViewTraversal(int id) { 12041 if (id == mID) { 12042 return this; 12043 } 12044 return null; 12045 } 12046 12047 /** 12048 * {@hide} 12049 * @param tag the tag of the view to be found 12050 * @return the view of specified tag, null if cannot be found 12051 */ 12052 protected View findViewWithTagTraversal(Object tag) { 12053 if (tag != null && tag.equals(mTag)) { 12054 return this; 12055 } 12056 return null; 12057 } 12058 12059 /** 12060 * {@hide} 12061 * @param predicate The predicate to evaluate. 12062 * @param childToSkip If not null, ignores this child during the recursive traversal. 12063 * @return The first view that matches the predicate or null. 12064 */ 12065 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 12066 if (predicate.apply(this)) { 12067 return this; 12068 } 12069 return null; 12070 } 12071 12072 /** 12073 * Look for a child view with the given id. If this view has the given 12074 * id, return this view. 12075 * 12076 * @param id The id to search for. 12077 * @return The view that has the given id in the hierarchy or null 12078 */ 12079 public final View findViewById(int id) { 12080 if (id < 0) { 12081 return null; 12082 } 12083 return findViewTraversal(id); 12084 } 12085 12086 /** 12087 * Look for a child view with the given tag. If this view has the given 12088 * tag, return this view. 12089 * 12090 * @param tag The tag to search for, using "tag.equals(getTag())". 12091 * @return The View that has the given tag in the hierarchy or null 12092 */ 12093 public final View findViewWithTag(Object tag) { 12094 if (tag == null) { 12095 return null; 12096 } 12097 return findViewWithTagTraversal(tag); 12098 } 12099 12100 /** 12101 * {@hide} 12102 * Look for a child view that matches the specified predicate. 12103 * If this view matches the predicate, return this view. 12104 * 12105 * @param predicate The predicate to evaluate. 12106 * @return The first view that matches the predicate or null. 12107 */ 12108 public final View findViewByPredicate(Predicate<View> predicate) { 12109 return findViewByPredicateTraversal(predicate, null); 12110 } 12111 12112 /** 12113 * {@hide} 12114 * Look for a child view that matches the specified predicate, 12115 * starting with the specified view and its descendents and then 12116 * recusively searching the ancestors and siblings of that view 12117 * until this view is reached. 12118 * 12119 * This method is useful in cases where the predicate does not match 12120 * a single unique view (perhaps multiple views use the same id) 12121 * and we are trying to find the view that is "closest" in scope to the 12122 * starting view. 12123 * 12124 * @param start The view to start from. 12125 * @param predicate The predicate to evaluate. 12126 * @return The first view that matches the predicate or null. 12127 */ 12128 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 12129 View childToSkip = null; 12130 for (;;) { 12131 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 12132 if (view != null || start == this) { 12133 return view; 12134 } 12135 12136 ViewParent parent = start.getParent(); 12137 if (parent == null || !(parent instanceof View)) { 12138 return null; 12139 } 12140 12141 childToSkip = start; 12142 start = (View) parent; 12143 } 12144 } 12145 12146 /** 12147 * Sets the identifier for this view. The identifier does not have to be 12148 * unique in this view's hierarchy. The identifier should be a positive 12149 * number. 12150 * 12151 * @see #NO_ID 12152 * @see #getId() 12153 * @see #findViewById(int) 12154 * 12155 * @param id a number used to identify the view 12156 * 12157 * @attr ref android.R.styleable#View_id 12158 */ 12159 public void setId(int id) { 12160 mID = id; 12161 } 12162 12163 /** 12164 * {@hide} 12165 * 12166 * @param isRoot true if the view belongs to the root namespace, false 12167 * otherwise 12168 */ 12169 public void setIsRootNamespace(boolean isRoot) { 12170 if (isRoot) { 12171 mPrivateFlags |= IS_ROOT_NAMESPACE; 12172 } else { 12173 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 12174 } 12175 } 12176 12177 /** 12178 * {@hide} 12179 * 12180 * @return true if the view belongs to the root namespace, false otherwise 12181 */ 12182 public boolean isRootNamespace() { 12183 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 12184 } 12185 12186 /** 12187 * Returns this view's identifier. 12188 * 12189 * @return a positive integer used to identify the view or {@link #NO_ID} 12190 * if the view has no ID 12191 * 12192 * @see #setId(int) 12193 * @see #findViewById(int) 12194 * @attr ref android.R.styleable#View_id 12195 */ 12196 @ViewDebug.CapturedViewProperty 12197 public int getId() { 12198 return mID; 12199 } 12200 12201 /** 12202 * Returns this view's tag. 12203 * 12204 * @return the Object stored in this view as a tag 12205 * 12206 * @see #setTag(Object) 12207 * @see #getTag(int) 12208 */ 12209 @ViewDebug.ExportedProperty 12210 public Object getTag() { 12211 return mTag; 12212 } 12213 12214 /** 12215 * Sets the tag associated with this view. A tag can be used to mark 12216 * a view in its hierarchy and does not have to be unique within the 12217 * hierarchy. Tags can also be used to store data within a view without 12218 * resorting to another data structure. 12219 * 12220 * @param tag an Object to tag the view with 12221 * 12222 * @see #getTag() 12223 * @see #setTag(int, Object) 12224 */ 12225 public void setTag(final Object tag) { 12226 mTag = tag; 12227 } 12228 12229 /** 12230 * Returns the tag associated with this view and the specified key. 12231 * 12232 * @param key The key identifying the tag 12233 * 12234 * @return the Object stored in this view as a tag 12235 * 12236 * @see #setTag(int, Object) 12237 * @see #getTag() 12238 */ 12239 public Object getTag(int key) { 12240 if (mKeyedTags != null) return mKeyedTags.get(key); 12241 return null; 12242 } 12243 12244 /** 12245 * Sets a tag associated with this view and a key. A tag can be used 12246 * to mark a view in its hierarchy and does not have to be unique within 12247 * the hierarchy. Tags can also be used to store data within a view 12248 * without resorting to another data structure. 12249 * 12250 * The specified key should be an id declared in the resources of the 12251 * application to ensure it is unique (see the <a 12252 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 12253 * Keys identified as belonging to 12254 * the Android framework or not associated with any package will cause 12255 * an {@link IllegalArgumentException} to be thrown. 12256 * 12257 * @param key The key identifying the tag 12258 * @param tag An Object to tag the view with 12259 * 12260 * @throws IllegalArgumentException If they specified key is not valid 12261 * 12262 * @see #setTag(Object) 12263 * @see #getTag(int) 12264 */ 12265 public void setTag(int key, final Object tag) { 12266 // If the package id is 0x00 or 0x01, it's either an undefined package 12267 // or a framework id 12268 if ((key >>> 24) < 2) { 12269 throw new IllegalArgumentException("The key must be an application-specific " 12270 + "resource id."); 12271 } 12272 12273 setKeyedTag(key, tag); 12274 } 12275 12276 /** 12277 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 12278 * framework id. 12279 * 12280 * @hide 12281 */ 12282 public void setTagInternal(int key, Object tag) { 12283 if ((key >>> 24) != 0x1) { 12284 throw new IllegalArgumentException("The key must be a framework-specific " 12285 + "resource id."); 12286 } 12287 12288 setKeyedTag(key, tag); 12289 } 12290 12291 private void setKeyedTag(int key, Object tag) { 12292 if (mKeyedTags == null) { 12293 mKeyedTags = new SparseArray<Object>(); 12294 } 12295 12296 mKeyedTags.put(key, tag); 12297 } 12298 12299 /** 12300 * @param consistency The type of consistency. See ViewDebug for more information. 12301 * 12302 * @hide 12303 */ 12304 protected boolean dispatchConsistencyCheck(int consistency) { 12305 return onConsistencyCheck(consistency); 12306 } 12307 12308 /** 12309 * Method that subclasses should implement to check their consistency. The type of 12310 * consistency check is indicated by the bit field passed as a parameter. 12311 * 12312 * @param consistency The type of consistency. See ViewDebug for more information. 12313 * 12314 * @throws IllegalStateException if the view is in an inconsistent state. 12315 * 12316 * @hide 12317 */ 12318 protected boolean onConsistencyCheck(int consistency) { 12319 boolean result = true; 12320 12321 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 12322 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 12323 12324 if (checkLayout) { 12325 if (getParent() == null) { 12326 result = false; 12327 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12328 "View " + this + " does not have a parent."); 12329 } 12330 12331 if (mAttachInfo == null) { 12332 result = false; 12333 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12334 "View " + this + " is not attached to a window."); 12335 } 12336 } 12337 12338 if (checkDrawing) { 12339 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 12340 // from their draw() method 12341 12342 if ((mPrivateFlags & DRAWN) != DRAWN && 12343 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 12344 result = false; 12345 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12346 "View " + this + " was invalidated but its drawing cache is valid."); 12347 } 12348 } 12349 12350 return result; 12351 } 12352 12353 /** 12354 * Prints information about this view in the log output, with the tag 12355 * {@link #VIEW_LOG_TAG}. 12356 * 12357 * @hide 12358 */ 12359 public void debug() { 12360 debug(0); 12361 } 12362 12363 /** 12364 * Prints information about this view in the log output, with the tag 12365 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 12366 * indentation defined by the <code>depth</code>. 12367 * 12368 * @param depth the indentation level 12369 * 12370 * @hide 12371 */ 12372 protected void debug(int depth) { 12373 String output = debugIndent(depth - 1); 12374 12375 output += "+ " + this; 12376 int id = getId(); 12377 if (id != -1) { 12378 output += " (id=" + id + ")"; 12379 } 12380 Object tag = getTag(); 12381 if (tag != null) { 12382 output += " (tag=" + tag + ")"; 12383 } 12384 Log.d(VIEW_LOG_TAG, output); 12385 12386 if ((mPrivateFlags & FOCUSED) != 0) { 12387 output = debugIndent(depth) + " FOCUSED"; 12388 Log.d(VIEW_LOG_TAG, output); 12389 } 12390 12391 output = debugIndent(depth); 12392 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 12393 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 12394 + "} "; 12395 Log.d(VIEW_LOG_TAG, output); 12396 12397 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 12398 || mPaddingBottom != 0) { 12399 output = debugIndent(depth); 12400 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 12401 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 12402 Log.d(VIEW_LOG_TAG, output); 12403 } 12404 12405 output = debugIndent(depth); 12406 output += "mMeasureWidth=" + mMeasuredWidth + 12407 " mMeasureHeight=" + mMeasuredHeight; 12408 Log.d(VIEW_LOG_TAG, output); 12409 12410 output = debugIndent(depth); 12411 if (mLayoutParams == null) { 12412 output += "BAD! no layout params"; 12413 } else { 12414 output = mLayoutParams.debug(output); 12415 } 12416 Log.d(VIEW_LOG_TAG, output); 12417 12418 output = debugIndent(depth); 12419 output += "flags={"; 12420 output += View.printFlags(mViewFlags); 12421 output += "}"; 12422 Log.d(VIEW_LOG_TAG, output); 12423 12424 output = debugIndent(depth); 12425 output += "privateFlags={"; 12426 output += View.printPrivateFlags(mPrivateFlags); 12427 output += "}"; 12428 Log.d(VIEW_LOG_TAG, output); 12429 } 12430 12431 /** 12432 * Creates an string of whitespaces used for indentation. 12433 * 12434 * @param depth the indentation level 12435 * @return a String containing (depth * 2 + 3) * 2 white spaces 12436 * 12437 * @hide 12438 */ 12439 protected static String debugIndent(int depth) { 12440 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 12441 for (int i = 0; i < (depth * 2) + 3; i++) { 12442 spaces.append(' ').append(' '); 12443 } 12444 return spaces.toString(); 12445 } 12446 12447 /** 12448 * <p>Return the offset of the widget's text baseline from the widget's top 12449 * boundary. If this widget does not support baseline alignment, this 12450 * method returns -1. </p> 12451 * 12452 * @return the offset of the baseline within the widget's bounds or -1 12453 * if baseline alignment is not supported 12454 */ 12455 @ViewDebug.ExportedProperty(category = "layout") 12456 public int getBaseline() { 12457 return -1; 12458 } 12459 12460 /** 12461 * Call this when something has changed which has invalidated the 12462 * layout of this view. This will schedule a layout pass of the view 12463 * tree. 12464 */ 12465 public void requestLayout() { 12466 if (ViewDebug.TRACE_HIERARCHY) { 12467 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 12468 } 12469 12470 mPrivateFlags |= FORCE_LAYOUT; 12471 mPrivateFlags |= INVALIDATED; 12472 12473 if (mParent != null) { 12474 if (mLayoutParams != null) { 12475 mLayoutParams.resolveWithDirection(getResolvedLayoutDirection()); 12476 } 12477 if (!mParent.isLayoutRequested()) { 12478 mParent.requestLayout(); 12479 } 12480 } 12481 } 12482 12483 /** 12484 * Forces this view to be laid out during the next layout pass. 12485 * This method does not call requestLayout() or forceLayout() 12486 * on the parent. 12487 */ 12488 public void forceLayout() { 12489 mPrivateFlags |= FORCE_LAYOUT; 12490 mPrivateFlags |= INVALIDATED; 12491 } 12492 12493 /** 12494 * <p> 12495 * This is called to find out how big a view should be. The parent 12496 * supplies constraint information in the width and height parameters. 12497 * </p> 12498 * 12499 * <p> 12500 * The actual mesurement work of a view is performed in 12501 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 12502 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 12503 * </p> 12504 * 12505 * 12506 * @param widthMeasureSpec Horizontal space requirements as imposed by the 12507 * parent 12508 * @param heightMeasureSpec Vertical space requirements as imposed by the 12509 * parent 12510 * 12511 * @see #onMeasure(int, int) 12512 */ 12513 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 12514 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 12515 widthMeasureSpec != mOldWidthMeasureSpec || 12516 heightMeasureSpec != mOldHeightMeasureSpec) { 12517 12518 // first clears the measured dimension flag 12519 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 12520 12521 if (ViewDebug.TRACE_HIERARCHY) { 12522 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 12523 } 12524 12525 // measure ourselves, this should set the measured dimension flag back 12526 onMeasure(widthMeasureSpec, heightMeasureSpec); 12527 12528 // flag not set, setMeasuredDimension() was not invoked, we raise 12529 // an exception to warn the developer 12530 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 12531 throw new IllegalStateException("onMeasure() did not set the" 12532 + " measured dimension by calling" 12533 + " setMeasuredDimension()"); 12534 } 12535 12536 mPrivateFlags |= LAYOUT_REQUIRED; 12537 } 12538 12539 mOldWidthMeasureSpec = widthMeasureSpec; 12540 mOldHeightMeasureSpec = heightMeasureSpec; 12541 } 12542 12543 /** 12544 * <p> 12545 * Measure the view and its content to determine the measured width and the 12546 * measured height. This method is invoked by {@link #measure(int, int)} and 12547 * should be overriden by subclasses to provide accurate and efficient 12548 * measurement of their contents. 12549 * </p> 12550 * 12551 * <p> 12552 * <strong>CONTRACT:</strong> When overriding this method, you 12553 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 12554 * measured width and height of this view. Failure to do so will trigger an 12555 * <code>IllegalStateException</code>, thrown by 12556 * {@link #measure(int, int)}. Calling the superclass' 12557 * {@link #onMeasure(int, int)} is a valid use. 12558 * </p> 12559 * 12560 * <p> 12561 * The base class implementation of measure defaults to the background size, 12562 * unless a larger size is allowed by the MeasureSpec. Subclasses should 12563 * override {@link #onMeasure(int, int)} to provide better measurements of 12564 * their content. 12565 * </p> 12566 * 12567 * <p> 12568 * If this method is overridden, it is the subclass's responsibility to make 12569 * sure the measured height and width are at least the view's minimum height 12570 * and width ({@link #getSuggestedMinimumHeight()} and 12571 * {@link #getSuggestedMinimumWidth()}). 12572 * </p> 12573 * 12574 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 12575 * The requirements are encoded with 12576 * {@link android.view.View.MeasureSpec}. 12577 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 12578 * The requirements are encoded with 12579 * {@link android.view.View.MeasureSpec}. 12580 * 12581 * @see #getMeasuredWidth() 12582 * @see #getMeasuredHeight() 12583 * @see #setMeasuredDimension(int, int) 12584 * @see #getSuggestedMinimumHeight() 12585 * @see #getSuggestedMinimumWidth() 12586 * @see android.view.View.MeasureSpec#getMode(int) 12587 * @see android.view.View.MeasureSpec#getSize(int) 12588 */ 12589 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 12590 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 12591 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 12592 } 12593 12594 /** 12595 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 12596 * measured width and measured height. Failing to do so will trigger an 12597 * exception at measurement time.</p> 12598 * 12599 * @param measuredWidth The measured width of this view. May be a complex 12600 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12601 * {@link #MEASURED_STATE_TOO_SMALL}. 12602 * @param measuredHeight The measured height of this view. May be a complex 12603 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12604 * {@link #MEASURED_STATE_TOO_SMALL}. 12605 */ 12606 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 12607 mMeasuredWidth = measuredWidth; 12608 mMeasuredHeight = measuredHeight; 12609 12610 mPrivateFlags |= MEASURED_DIMENSION_SET; 12611 } 12612 12613 /** 12614 * Merge two states as returned by {@link #getMeasuredState()}. 12615 * @param curState The current state as returned from a view or the result 12616 * of combining multiple views. 12617 * @param newState The new view state to combine. 12618 * @return Returns a new integer reflecting the combination of the two 12619 * states. 12620 */ 12621 public static int combineMeasuredStates(int curState, int newState) { 12622 return curState | newState; 12623 } 12624 12625 /** 12626 * Version of {@link #resolveSizeAndState(int, int, int)} 12627 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 12628 */ 12629 public static int resolveSize(int size, int measureSpec) { 12630 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 12631 } 12632 12633 /** 12634 * Utility to reconcile a desired size and state, with constraints imposed 12635 * by a MeasureSpec. Will take the desired size, unless a different size 12636 * is imposed by the constraints. The returned value is a compound integer, 12637 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 12638 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 12639 * size is smaller than the size the view wants to be. 12640 * 12641 * @param size How big the view wants to be 12642 * @param measureSpec Constraints imposed by the parent 12643 * @return Size information bit mask as defined by 12644 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 12645 */ 12646 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 12647 int result = size; 12648 int specMode = MeasureSpec.getMode(measureSpec); 12649 int specSize = MeasureSpec.getSize(measureSpec); 12650 switch (specMode) { 12651 case MeasureSpec.UNSPECIFIED: 12652 result = size; 12653 break; 12654 case MeasureSpec.AT_MOST: 12655 if (specSize < size) { 12656 result = specSize | MEASURED_STATE_TOO_SMALL; 12657 } else { 12658 result = size; 12659 } 12660 break; 12661 case MeasureSpec.EXACTLY: 12662 result = specSize; 12663 break; 12664 } 12665 return result | (childMeasuredState&MEASURED_STATE_MASK); 12666 } 12667 12668 /** 12669 * Utility to return a default size. Uses the supplied size if the 12670 * MeasureSpec imposed no constraints. Will get larger if allowed 12671 * by the MeasureSpec. 12672 * 12673 * @param size Default size for this view 12674 * @param measureSpec Constraints imposed by the parent 12675 * @return The size this view should be. 12676 */ 12677 public static int getDefaultSize(int size, int measureSpec) { 12678 int result = size; 12679 int specMode = MeasureSpec.getMode(measureSpec); 12680 int specSize = MeasureSpec.getSize(measureSpec); 12681 12682 switch (specMode) { 12683 case MeasureSpec.UNSPECIFIED: 12684 result = size; 12685 break; 12686 case MeasureSpec.AT_MOST: 12687 case MeasureSpec.EXACTLY: 12688 result = specSize; 12689 break; 12690 } 12691 return result; 12692 } 12693 12694 /** 12695 * Returns the suggested minimum height that the view should use. This 12696 * returns the maximum of the view's minimum height 12697 * and the background's minimum height 12698 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 12699 * <p> 12700 * When being used in {@link #onMeasure(int, int)}, the caller should still 12701 * ensure the returned height is within the requirements of the parent. 12702 * 12703 * @return The suggested minimum height of the view. 12704 */ 12705 protected int getSuggestedMinimumHeight() { 12706 int suggestedMinHeight = mMinHeight; 12707 12708 if (mBGDrawable != null) { 12709 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 12710 if (suggestedMinHeight < bgMinHeight) { 12711 suggestedMinHeight = bgMinHeight; 12712 } 12713 } 12714 12715 return suggestedMinHeight; 12716 } 12717 12718 /** 12719 * Returns the suggested minimum width that the view should use. This 12720 * returns the maximum of the view's minimum width) 12721 * and the background's minimum width 12722 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 12723 * <p> 12724 * When being used in {@link #onMeasure(int, int)}, the caller should still 12725 * ensure the returned width is within the requirements of the parent. 12726 * 12727 * @return The suggested minimum width of the view. 12728 */ 12729 protected int getSuggestedMinimumWidth() { 12730 int suggestedMinWidth = mMinWidth; 12731 12732 if (mBGDrawable != null) { 12733 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 12734 if (suggestedMinWidth < bgMinWidth) { 12735 suggestedMinWidth = bgMinWidth; 12736 } 12737 } 12738 12739 return suggestedMinWidth; 12740 } 12741 12742 /** 12743 * Sets the minimum height of the view. It is not guaranteed the view will 12744 * be able to achieve this minimum height (for example, if its parent layout 12745 * constrains it with less available height). 12746 * 12747 * @param minHeight The minimum height the view will try to be. 12748 */ 12749 public void setMinimumHeight(int minHeight) { 12750 mMinHeight = minHeight; 12751 } 12752 12753 /** 12754 * Sets the minimum width of the view. It is not guaranteed the view will 12755 * be able to achieve this minimum width (for example, if its parent layout 12756 * constrains it with less available width). 12757 * 12758 * @param minWidth The minimum width the view will try to be. 12759 */ 12760 public void setMinimumWidth(int minWidth) { 12761 mMinWidth = minWidth; 12762 } 12763 12764 /** 12765 * Get the animation currently associated with this view. 12766 * 12767 * @return The animation that is currently playing or 12768 * scheduled to play for this view. 12769 */ 12770 public Animation getAnimation() { 12771 return mCurrentAnimation; 12772 } 12773 12774 /** 12775 * Start the specified animation now. 12776 * 12777 * @param animation the animation to start now 12778 */ 12779 public void startAnimation(Animation animation) { 12780 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 12781 setAnimation(animation); 12782 invalidateParentCaches(); 12783 invalidate(true); 12784 } 12785 12786 /** 12787 * Cancels any animations for this view. 12788 */ 12789 public void clearAnimation() { 12790 if (mCurrentAnimation != null) { 12791 mCurrentAnimation.detach(); 12792 } 12793 mCurrentAnimation = null; 12794 invalidateParentIfNeeded(); 12795 } 12796 12797 /** 12798 * Sets the next animation to play for this view. 12799 * If you want the animation to play immediately, use 12800 * startAnimation. This method provides allows fine-grained 12801 * control over the start time and invalidation, but you 12802 * must make sure that 1) the animation has a start time set, and 12803 * 2) the view will be invalidated when the animation is supposed to 12804 * start. 12805 * 12806 * @param animation The next animation, or null. 12807 */ 12808 public void setAnimation(Animation animation) { 12809 mCurrentAnimation = animation; 12810 if (animation != null) { 12811 animation.reset(); 12812 } 12813 } 12814 12815 /** 12816 * Invoked by a parent ViewGroup to notify the start of the animation 12817 * currently associated with this view. If you override this method, 12818 * always call super.onAnimationStart(); 12819 * 12820 * @see #setAnimation(android.view.animation.Animation) 12821 * @see #getAnimation() 12822 */ 12823 protected void onAnimationStart() { 12824 mPrivateFlags |= ANIMATION_STARTED; 12825 } 12826 12827 /** 12828 * Invoked by a parent ViewGroup to notify the end of the animation 12829 * currently associated with this view. If you override this method, 12830 * always call super.onAnimationEnd(); 12831 * 12832 * @see #setAnimation(android.view.animation.Animation) 12833 * @see #getAnimation() 12834 */ 12835 protected void onAnimationEnd() { 12836 mPrivateFlags &= ~ANIMATION_STARTED; 12837 } 12838 12839 /** 12840 * Invoked if there is a Transform that involves alpha. Subclass that can 12841 * draw themselves with the specified alpha should return true, and then 12842 * respect that alpha when their onDraw() is called. If this returns false 12843 * then the view may be redirected to draw into an offscreen buffer to 12844 * fulfill the request, which will look fine, but may be slower than if the 12845 * subclass handles it internally. The default implementation returns false. 12846 * 12847 * @param alpha The alpha (0..255) to apply to the view's drawing 12848 * @return true if the view can draw with the specified alpha. 12849 */ 12850 protected boolean onSetAlpha(int alpha) { 12851 return false; 12852 } 12853 12854 /** 12855 * This is used by the RootView to perform an optimization when 12856 * the view hierarchy contains one or several SurfaceView. 12857 * SurfaceView is always considered transparent, but its children are not, 12858 * therefore all View objects remove themselves from the global transparent 12859 * region (passed as a parameter to this function). 12860 * 12861 * @param region The transparent region for this ViewAncestor (window). 12862 * 12863 * @return Returns true if the effective visibility of the view at this 12864 * point is opaque, regardless of the transparent region; returns false 12865 * if it is possible for underlying windows to be seen behind the view. 12866 * 12867 * {@hide} 12868 */ 12869 public boolean gatherTransparentRegion(Region region) { 12870 final AttachInfo attachInfo = mAttachInfo; 12871 if (region != null && attachInfo != null) { 12872 final int pflags = mPrivateFlags; 12873 if ((pflags & SKIP_DRAW) == 0) { 12874 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 12875 // remove it from the transparent region. 12876 final int[] location = attachInfo.mTransparentLocation; 12877 getLocationInWindow(location); 12878 region.op(location[0], location[1], location[0] + mRight - mLeft, 12879 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 12880 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 12881 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 12882 // exists, so we remove the background drawable's non-transparent 12883 // parts from this transparent region. 12884 applyDrawableToTransparentRegion(mBGDrawable, region); 12885 } 12886 } 12887 return true; 12888 } 12889 12890 /** 12891 * Play a sound effect for this view. 12892 * 12893 * <p>The framework will play sound effects for some built in actions, such as 12894 * clicking, but you may wish to play these effects in your widget, 12895 * for instance, for internal navigation. 12896 * 12897 * <p>The sound effect will only be played if sound effects are enabled by the user, and 12898 * {@link #isSoundEffectsEnabled()} is true. 12899 * 12900 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 12901 */ 12902 public void playSoundEffect(int soundConstant) { 12903 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 12904 return; 12905 } 12906 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 12907 } 12908 12909 /** 12910 * BZZZTT!!1! 12911 * 12912 * <p>Provide haptic feedback to the user for this view. 12913 * 12914 * <p>The framework will provide haptic feedback for some built in actions, 12915 * such as long presses, but you may wish to provide feedback for your 12916 * own widget. 12917 * 12918 * <p>The feedback will only be performed if 12919 * {@link #isHapticFeedbackEnabled()} is true. 12920 * 12921 * @param feedbackConstant One of the constants defined in 12922 * {@link HapticFeedbackConstants} 12923 */ 12924 public boolean performHapticFeedback(int feedbackConstant) { 12925 return performHapticFeedback(feedbackConstant, 0); 12926 } 12927 12928 /** 12929 * BZZZTT!!1! 12930 * 12931 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 12932 * 12933 * @param feedbackConstant One of the constants defined in 12934 * {@link HapticFeedbackConstants} 12935 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 12936 */ 12937 public boolean performHapticFeedback(int feedbackConstant, int flags) { 12938 if (mAttachInfo == null) { 12939 return false; 12940 } 12941 //noinspection SimplifiableIfStatement 12942 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 12943 && !isHapticFeedbackEnabled()) { 12944 return false; 12945 } 12946 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 12947 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 12948 } 12949 12950 /** 12951 * Request that the visibility of the status bar be changed. 12952 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 12953 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 12954 */ 12955 public void setSystemUiVisibility(int visibility) { 12956 if (visibility != mSystemUiVisibility) { 12957 mSystemUiVisibility = visibility; 12958 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12959 mParent.recomputeViewAttributes(this); 12960 } 12961 } 12962 } 12963 12964 /** 12965 * Returns the status bar visibility that this view has requested. 12966 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 12967 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 12968 */ 12969 public int getSystemUiVisibility() { 12970 return mSystemUiVisibility; 12971 } 12972 12973 /** 12974 * Set a listener to receive callbacks when the visibility of the system bar changes. 12975 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 12976 */ 12977 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 12978 mOnSystemUiVisibilityChangeListener = l; 12979 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12980 mParent.recomputeViewAttributes(this); 12981 } 12982 } 12983 12984 /** 12985 */ 12986 public void dispatchSystemUiVisibilityChanged(int visibility) { 12987 if (mOnSystemUiVisibilityChangeListener != null) { 12988 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 12989 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 12990 } 12991 } 12992 12993 /** 12994 * Creates an image that the system displays during the drag and drop 12995 * operation. This is called a "drag shadow". The default implementation 12996 * for a DragShadowBuilder based on a View returns an image that has exactly the same 12997 * appearance as the given View. The default also positions the center of the drag shadow 12998 * directly under the touch point. If no View is provided (the constructor with no parameters 12999 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 13000 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 13001 * default is an invisible drag shadow. 13002 * <p> 13003 * You are not required to use the View you provide to the constructor as the basis of the 13004 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 13005 * anything you want as the drag shadow. 13006 * </p> 13007 * <p> 13008 * You pass a DragShadowBuilder object to the system when you start the drag. The system 13009 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 13010 * size and position of the drag shadow. It uses this data to construct a 13011 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 13012 * so that your application can draw the shadow image in the Canvas. 13013 * </p> 13014 */ 13015 public static class DragShadowBuilder { 13016 private final WeakReference<View> mView; 13017 13018 /** 13019 * Constructs a shadow image builder based on a View. By default, the resulting drag 13020 * shadow will have the same appearance and dimensions as the View, with the touch point 13021 * over the center of the View. 13022 * @param view A View. Any View in scope can be used. 13023 */ 13024 public DragShadowBuilder(View view) { 13025 mView = new WeakReference<View>(view); 13026 } 13027 13028 /** 13029 * Construct a shadow builder object with no associated View. This 13030 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 13031 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 13032 * to supply the drag shadow's dimensions and appearance without 13033 * reference to any View object. If they are not overridden, then the result is an 13034 * invisible drag shadow. 13035 */ 13036 public DragShadowBuilder() { 13037 mView = new WeakReference<View>(null); 13038 } 13039 13040 /** 13041 * Returns the View object that had been passed to the 13042 * {@link #View.DragShadowBuilder(View)} 13043 * constructor. If that View parameter was {@code null} or if the 13044 * {@link #View.DragShadowBuilder()} 13045 * constructor was used to instantiate the builder object, this method will return 13046 * null. 13047 * 13048 * @return The View object associate with this builder object. 13049 */ 13050 @SuppressWarnings({"JavadocReference"}) 13051 final public View getView() { 13052 return mView.get(); 13053 } 13054 13055 /** 13056 * Provides the metrics for the shadow image. These include the dimensions of 13057 * the shadow image, and the point within that shadow that should 13058 * be centered under the touch location while dragging. 13059 * <p> 13060 * The default implementation sets the dimensions of the shadow to be the 13061 * same as the dimensions of the View itself and centers the shadow under 13062 * the touch point. 13063 * </p> 13064 * 13065 * @param shadowSize A {@link android.graphics.Point} containing the width and height 13066 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 13067 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 13068 * image. 13069 * 13070 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 13071 * shadow image that should be underneath the touch point during the drag and drop 13072 * operation. Your application must set {@link android.graphics.Point#x} to the 13073 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 13074 */ 13075 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 13076 final View view = mView.get(); 13077 if (view != null) { 13078 shadowSize.set(view.getWidth(), view.getHeight()); 13079 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 13080 } else { 13081 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 13082 } 13083 } 13084 13085 /** 13086 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 13087 * based on the dimensions it received from the 13088 * {@link #onProvideShadowMetrics(Point, Point)} callback. 13089 * 13090 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 13091 */ 13092 public void onDrawShadow(Canvas canvas) { 13093 final View view = mView.get(); 13094 if (view != null) { 13095 view.draw(canvas); 13096 } else { 13097 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 13098 } 13099 } 13100 } 13101 13102 /** 13103 * Starts a drag and drop operation. When your application calls this method, it passes a 13104 * {@link android.view.View.DragShadowBuilder} object to the system. The 13105 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 13106 * to get metrics for the drag shadow, and then calls the object's 13107 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 13108 * <p> 13109 * Once the system has the drag shadow, it begins the drag and drop operation by sending 13110 * drag events to all the View objects in your application that are currently visible. It does 13111 * this either by calling the View object's drag listener (an implementation of 13112 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 13113 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 13114 * Both are passed a {@link android.view.DragEvent} object that has a 13115 * {@link android.view.DragEvent#getAction()} value of 13116 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 13117 * </p> 13118 * <p> 13119 * Your application can invoke startDrag() on any attached View object. The View object does not 13120 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 13121 * be related to the View the user selected for dragging. 13122 * </p> 13123 * @param data A {@link android.content.ClipData} object pointing to the data to be 13124 * transferred by the drag and drop operation. 13125 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 13126 * drag shadow. 13127 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 13128 * drop operation. This Object is put into every DragEvent object sent by the system during the 13129 * current drag. 13130 * <p> 13131 * myLocalState is a lightweight mechanism for the sending information from the dragged View 13132 * to the target Views. For example, it can contain flags that differentiate between a 13133 * a copy operation and a move operation. 13134 * </p> 13135 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 13136 * so the parameter should be set to 0. 13137 * @return {@code true} if the method completes successfully, or 13138 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 13139 * do a drag, and so no drag operation is in progress. 13140 */ 13141 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 13142 Object myLocalState, int flags) { 13143 if (ViewDebug.DEBUG_DRAG) { 13144 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 13145 } 13146 boolean okay = false; 13147 13148 Point shadowSize = new Point(); 13149 Point shadowTouchPoint = new Point(); 13150 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 13151 13152 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 13153 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 13154 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 13155 } 13156 13157 if (ViewDebug.DEBUG_DRAG) { 13158 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 13159 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 13160 } 13161 Surface surface = new Surface(); 13162 try { 13163 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 13164 flags, shadowSize.x, shadowSize.y, surface); 13165 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 13166 + " surface=" + surface); 13167 if (token != null) { 13168 Canvas canvas = surface.lockCanvas(null); 13169 try { 13170 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 13171 shadowBuilder.onDrawShadow(canvas); 13172 } finally { 13173 surface.unlockCanvasAndPost(canvas); 13174 } 13175 13176 final ViewRootImpl root = getViewRootImpl(); 13177 13178 // Cache the local state object for delivery with DragEvents 13179 root.setLocalDragState(myLocalState); 13180 13181 // repurpose 'shadowSize' for the last touch point 13182 root.getLastTouchPoint(shadowSize); 13183 13184 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 13185 shadowSize.x, shadowSize.y, 13186 shadowTouchPoint.x, shadowTouchPoint.y, data); 13187 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 13188 13189 // Off and running! Release our local surface instance; the drag 13190 // shadow surface is now managed by the system process. 13191 surface.release(); 13192 } 13193 } catch (Exception e) { 13194 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 13195 surface.destroy(); 13196 } 13197 13198 return okay; 13199 } 13200 13201 /** 13202 * Handles drag events sent by the system following a call to 13203 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 13204 *<p> 13205 * When the system calls this method, it passes a 13206 * {@link android.view.DragEvent} object. A call to 13207 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 13208 * in DragEvent. The method uses these to determine what is happening in the drag and drop 13209 * operation. 13210 * @param event The {@link android.view.DragEvent} sent by the system. 13211 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 13212 * in DragEvent, indicating the type of drag event represented by this object. 13213 * @return {@code true} if the method was successful, otherwise {@code false}. 13214 * <p> 13215 * The method should return {@code true} in response to an action type of 13216 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 13217 * operation. 13218 * </p> 13219 * <p> 13220 * The method should also return {@code true} in response to an action type of 13221 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 13222 * {@code false} if it didn't. 13223 * </p> 13224 */ 13225 public boolean onDragEvent(DragEvent event) { 13226 return false; 13227 } 13228 13229 /** 13230 * Detects if this View is enabled and has a drag event listener. 13231 * If both are true, then it calls the drag event listener with the 13232 * {@link android.view.DragEvent} it received. If the drag event listener returns 13233 * {@code true}, then dispatchDragEvent() returns {@code true}. 13234 * <p> 13235 * For all other cases, the method calls the 13236 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 13237 * method and returns its result. 13238 * </p> 13239 * <p> 13240 * This ensures that a drag event is always consumed, even if the View does not have a drag 13241 * event listener. However, if the View has a listener and the listener returns true, then 13242 * onDragEvent() is not called. 13243 * </p> 13244 */ 13245 public boolean dispatchDragEvent(DragEvent event) { 13246 //noinspection SimplifiableIfStatement 13247 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 13248 && mOnDragListener.onDrag(this, event)) { 13249 return true; 13250 } 13251 return onDragEvent(event); 13252 } 13253 13254 boolean canAcceptDrag() { 13255 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 13256 } 13257 13258 /** 13259 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 13260 * it is ever exposed at all. 13261 * @hide 13262 */ 13263 public void onCloseSystemDialogs(String reason) { 13264 } 13265 13266 /** 13267 * Given a Drawable whose bounds have been set to draw into this view, 13268 * update a Region being computed for 13269 * {@link #gatherTransparentRegion(android.graphics.Region)} so 13270 * that any non-transparent parts of the Drawable are removed from the 13271 * given transparent region. 13272 * 13273 * @param dr The Drawable whose transparency is to be applied to the region. 13274 * @param region A Region holding the current transparency information, 13275 * where any parts of the region that are set are considered to be 13276 * transparent. On return, this region will be modified to have the 13277 * transparency information reduced by the corresponding parts of the 13278 * Drawable that are not transparent. 13279 * {@hide} 13280 */ 13281 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 13282 if (DBG) { 13283 Log.i("View", "Getting transparent region for: " + this); 13284 } 13285 final Region r = dr.getTransparentRegion(); 13286 final Rect db = dr.getBounds(); 13287 final AttachInfo attachInfo = mAttachInfo; 13288 if (r != null && attachInfo != null) { 13289 final int w = getRight()-getLeft(); 13290 final int h = getBottom()-getTop(); 13291 if (db.left > 0) { 13292 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 13293 r.op(0, 0, db.left, h, Region.Op.UNION); 13294 } 13295 if (db.right < w) { 13296 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 13297 r.op(db.right, 0, w, h, Region.Op.UNION); 13298 } 13299 if (db.top > 0) { 13300 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 13301 r.op(0, 0, w, db.top, Region.Op.UNION); 13302 } 13303 if (db.bottom < h) { 13304 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 13305 r.op(0, db.bottom, w, h, Region.Op.UNION); 13306 } 13307 final int[] location = attachInfo.mTransparentLocation; 13308 getLocationInWindow(location); 13309 r.translate(location[0], location[1]); 13310 region.op(r, Region.Op.INTERSECT); 13311 } else { 13312 region.op(db, Region.Op.DIFFERENCE); 13313 } 13314 } 13315 13316 private void checkForLongClick(int delayOffset) { 13317 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 13318 mHasPerformedLongPress = false; 13319 13320 if (mPendingCheckForLongPress == null) { 13321 mPendingCheckForLongPress = new CheckForLongPress(); 13322 } 13323 mPendingCheckForLongPress.rememberWindowAttachCount(); 13324 postDelayed(mPendingCheckForLongPress, 13325 ViewConfiguration.getLongPressTimeout() - delayOffset); 13326 } 13327 } 13328 13329 /** 13330 * Inflate a view from an XML resource. This convenience method wraps the {@link 13331 * LayoutInflater} class, which provides a full range of options for view inflation. 13332 * 13333 * @param context The Context object for your activity or application. 13334 * @param resource The resource ID to inflate 13335 * @param root A view group that will be the parent. Used to properly inflate the 13336 * layout_* parameters. 13337 * @see LayoutInflater 13338 */ 13339 public static View inflate(Context context, int resource, ViewGroup root) { 13340 LayoutInflater factory = LayoutInflater.from(context); 13341 return factory.inflate(resource, root); 13342 } 13343 13344 /** 13345 * Scroll the view with standard behavior for scrolling beyond the normal 13346 * content boundaries. Views that call this method should override 13347 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 13348 * results of an over-scroll operation. 13349 * 13350 * Views can use this method to handle any touch or fling-based scrolling. 13351 * 13352 * @param deltaX Change in X in pixels 13353 * @param deltaY Change in Y in pixels 13354 * @param scrollX Current X scroll value in pixels before applying deltaX 13355 * @param scrollY Current Y scroll value in pixels before applying deltaY 13356 * @param scrollRangeX Maximum content scroll range along the X axis 13357 * @param scrollRangeY Maximum content scroll range along the Y axis 13358 * @param maxOverScrollX Number of pixels to overscroll by in either direction 13359 * along the X axis. 13360 * @param maxOverScrollY Number of pixels to overscroll by in either direction 13361 * along the Y axis. 13362 * @param isTouchEvent true if this scroll operation is the result of a touch event. 13363 * @return true if scrolling was clamped to an over-scroll boundary along either 13364 * axis, false otherwise. 13365 */ 13366 @SuppressWarnings({"UnusedParameters"}) 13367 protected boolean overScrollBy(int deltaX, int deltaY, 13368 int scrollX, int scrollY, 13369 int scrollRangeX, int scrollRangeY, 13370 int maxOverScrollX, int maxOverScrollY, 13371 boolean isTouchEvent) { 13372 final int overScrollMode = mOverScrollMode; 13373 final boolean canScrollHorizontal = 13374 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 13375 final boolean canScrollVertical = 13376 computeVerticalScrollRange() > computeVerticalScrollExtent(); 13377 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 13378 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 13379 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 13380 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 13381 13382 int newScrollX = scrollX + deltaX; 13383 if (!overScrollHorizontal) { 13384 maxOverScrollX = 0; 13385 } 13386 13387 int newScrollY = scrollY + deltaY; 13388 if (!overScrollVertical) { 13389 maxOverScrollY = 0; 13390 } 13391 13392 // Clamp values if at the limits and record 13393 final int left = -maxOverScrollX; 13394 final int right = maxOverScrollX + scrollRangeX; 13395 final int top = -maxOverScrollY; 13396 final int bottom = maxOverScrollY + scrollRangeY; 13397 13398 boolean clampedX = false; 13399 if (newScrollX > right) { 13400 newScrollX = right; 13401 clampedX = true; 13402 } else if (newScrollX < left) { 13403 newScrollX = left; 13404 clampedX = true; 13405 } 13406 13407 boolean clampedY = false; 13408 if (newScrollY > bottom) { 13409 newScrollY = bottom; 13410 clampedY = true; 13411 } else if (newScrollY < top) { 13412 newScrollY = top; 13413 clampedY = true; 13414 } 13415 13416 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 13417 13418 return clampedX || clampedY; 13419 } 13420 13421 /** 13422 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 13423 * respond to the results of an over-scroll operation. 13424 * 13425 * @param scrollX New X scroll value in pixels 13426 * @param scrollY New Y scroll value in pixels 13427 * @param clampedX True if scrollX was clamped to an over-scroll boundary 13428 * @param clampedY True if scrollY was clamped to an over-scroll boundary 13429 */ 13430 protected void onOverScrolled(int scrollX, int scrollY, 13431 boolean clampedX, boolean clampedY) { 13432 // Intentionally empty. 13433 } 13434 13435 /** 13436 * Returns the over-scroll mode for this view. The result will be 13437 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13438 * (allow over-scrolling only if the view content is larger than the container), 13439 * or {@link #OVER_SCROLL_NEVER}. 13440 * 13441 * @return This view's over-scroll mode. 13442 */ 13443 public int getOverScrollMode() { 13444 return mOverScrollMode; 13445 } 13446 13447 /** 13448 * Set the over-scroll mode for this view. Valid over-scroll modes are 13449 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13450 * (allow over-scrolling only if the view content is larger than the container), 13451 * or {@link #OVER_SCROLL_NEVER}. 13452 * 13453 * Setting the over-scroll mode of a view will have an effect only if the 13454 * view is capable of scrolling. 13455 * 13456 * @param overScrollMode The new over-scroll mode for this view. 13457 */ 13458 public void setOverScrollMode(int overScrollMode) { 13459 if (overScrollMode != OVER_SCROLL_ALWAYS && 13460 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 13461 overScrollMode != OVER_SCROLL_NEVER) { 13462 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 13463 } 13464 mOverScrollMode = overScrollMode; 13465 } 13466 13467 /** 13468 * Gets a scale factor that determines the distance the view should scroll 13469 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 13470 * @return The vertical scroll scale factor. 13471 * @hide 13472 */ 13473 protected float getVerticalScrollFactor() { 13474 if (mVerticalScrollFactor == 0) { 13475 TypedValue outValue = new TypedValue(); 13476 if (!mContext.getTheme().resolveAttribute( 13477 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 13478 throw new IllegalStateException( 13479 "Expected theme to define listPreferredItemHeight."); 13480 } 13481 mVerticalScrollFactor = outValue.getDimension( 13482 mContext.getResources().getDisplayMetrics()); 13483 } 13484 return mVerticalScrollFactor; 13485 } 13486 13487 /** 13488 * Gets a scale factor that determines the distance the view should scroll 13489 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 13490 * @return The horizontal scroll scale factor. 13491 * @hide 13492 */ 13493 protected float getHorizontalScrollFactor() { 13494 // TODO: Should use something else. 13495 return getVerticalScrollFactor(); 13496 } 13497 13498 /** 13499 * Return the value specifying the text direction or policy that was set with 13500 * {@link #setTextDirection(int)}. 13501 * 13502 * @return the defined text direction. It can be one of: 13503 * 13504 * {@link #TEXT_DIRECTION_INHERIT}, 13505 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13506 * {@link #TEXT_DIRECTION_ANY_RTL}, 13507 * {@link #TEXT_DIRECTION_LTR}, 13508 * {@link #TEXT_DIRECTION_RTL}, 13509 * 13510 * @hide 13511 */ 13512 public int getTextDirection() { 13513 return mTextDirection; 13514 } 13515 13516 /** 13517 * Set the text direction. 13518 * 13519 * @param textDirection the direction to set. Should be one of: 13520 * 13521 * {@link #TEXT_DIRECTION_INHERIT}, 13522 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13523 * {@link #TEXT_DIRECTION_ANY_RTL}, 13524 * {@link #TEXT_DIRECTION_LTR}, 13525 * {@link #TEXT_DIRECTION_RTL}, 13526 * 13527 * @hide 13528 */ 13529 public void setTextDirection(int textDirection) { 13530 if (textDirection != mTextDirection) { 13531 mTextDirection = textDirection; 13532 resetResolvedTextDirection(); 13533 requestLayout(); 13534 } 13535 } 13536 13537 /** 13538 * Return the resolved text direction. 13539 * 13540 * @return the resolved text direction. Return one of: 13541 * 13542 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13543 * {@link #TEXT_DIRECTION_ANY_RTL}, 13544 * {@link #TEXT_DIRECTION_LTR}, 13545 * {@link #TEXT_DIRECTION_RTL}, 13546 * 13547 * @hide 13548 */ 13549 public int getResolvedTextDirection() { 13550 if (mResolvedTextDirection == TEXT_DIRECTION_INHERIT) { 13551 resolveTextDirection(); 13552 } 13553 return mResolvedTextDirection; 13554 } 13555 13556 /** 13557 * Resolve the text direction. 13558 * 13559 * @hide 13560 */ 13561 protected void resolveTextDirection() { 13562 if (mTextDirection != TEXT_DIRECTION_INHERIT) { 13563 mResolvedTextDirection = mTextDirection; 13564 return; 13565 } 13566 if (mParent != null && mParent instanceof ViewGroup) { 13567 mResolvedTextDirection = ((ViewGroup) mParent).getResolvedTextDirection(); 13568 return; 13569 } 13570 mResolvedTextDirection = TEXT_DIRECTION_FIRST_STRONG; 13571 } 13572 13573 /** 13574 * Reset resolved text direction. Will be resolved during a call to getResolvedTextDirection(). 13575 * 13576 * @hide 13577 */ 13578 protected void resetResolvedTextDirection() { 13579 mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 13580 } 13581 13582 // 13583 // Properties 13584 // 13585 /** 13586 * A Property wrapper around the <code>alpha</code> functionality handled by the 13587 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 13588 */ 13589 public static Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 13590 @Override 13591 public void setValue(View object, float value) { 13592 object.setAlpha(value); 13593 } 13594 13595 @Override 13596 public Float get(View object) { 13597 return object.getAlpha(); 13598 } 13599 }; 13600 13601 /** 13602 * A Property wrapper around the <code>translationX</code> functionality handled by the 13603 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 13604 */ 13605 public static Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 13606 @Override 13607 public void setValue(View object, float value) { 13608 object.setTranslationX(value); 13609 } 13610 13611 @Override 13612 public Float get(View object) { 13613 return object.getTranslationX(); 13614 } 13615 }; 13616 13617 /** 13618 * A Property wrapper around the <code>translationY</code> functionality handled by the 13619 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 13620 */ 13621 public static Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 13622 @Override 13623 public void setValue(View object, float value) { 13624 object.setTranslationY(value); 13625 } 13626 13627 @Override 13628 public Float get(View object) { 13629 return object.getTranslationY(); 13630 } 13631 }; 13632 13633 /** 13634 * A Property wrapper around the <code>x</code> functionality handled by the 13635 * {@link View#setX(float)} and {@link View#getX()} methods. 13636 */ 13637 public static Property<View, Float> X = new FloatProperty<View>("x") { 13638 @Override 13639 public void setValue(View object, float value) { 13640 object.setX(value); 13641 } 13642 13643 @Override 13644 public Float get(View object) { 13645 return object.getX(); 13646 } 13647 }; 13648 13649 /** 13650 * A Property wrapper around the <code>y</code> functionality handled by the 13651 * {@link View#setY(float)} and {@link View#getY()} methods. 13652 */ 13653 public static Property<View, Float> Y = new FloatProperty<View>("y") { 13654 @Override 13655 public void setValue(View object, float value) { 13656 object.setY(value); 13657 } 13658 13659 @Override 13660 public Float get(View object) { 13661 return object.getY(); 13662 } 13663 }; 13664 13665 /** 13666 * A Property wrapper around the <code>rotation</code> functionality handled by the 13667 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 13668 */ 13669 public static Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 13670 @Override 13671 public void setValue(View object, float value) { 13672 object.setRotation(value); 13673 } 13674 13675 @Override 13676 public Float get(View object) { 13677 return object.getRotation(); 13678 } 13679 }; 13680 13681 /** 13682 * A Property wrapper around the <code>rotationX</code> functionality handled by the 13683 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 13684 */ 13685 public static Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 13686 @Override 13687 public void setValue(View object, float value) { 13688 object.setRotationX(value); 13689 } 13690 13691 @Override 13692 public Float get(View object) { 13693 return object.getRotationX(); 13694 } 13695 }; 13696 13697 /** 13698 * A Property wrapper around the <code>rotationY</code> functionality handled by the 13699 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 13700 */ 13701 public static Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 13702 @Override 13703 public void setValue(View object, float value) { 13704 object.setRotationY(value); 13705 } 13706 13707 @Override 13708 public Float get(View object) { 13709 return object.getRotationY(); 13710 } 13711 }; 13712 13713 /** 13714 * A Property wrapper around the <code>scaleX</code> functionality handled by the 13715 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 13716 */ 13717 public static Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 13718 @Override 13719 public void setValue(View object, float value) { 13720 object.setScaleX(value); 13721 } 13722 13723 @Override 13724 public Float get(View object) { 13725 return object.getScaleX(); 13726 } 13727 }; 13728 13729 /** 13730 * A Property wrapper around the <code>scaleY</code> functionality handled by the 13731 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 13732 */ 13733 public static Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 13734 @Override 13735 public void setValue(View object, float value) { 13736 object.setScaleY(value); 13737 } 13738 13739 @Override 13740 public Float get(View object) { 13741 return object.getScaleY(); 13742 } 13743 }; 13744 13745 /** 13746 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 13747 * Each MeasureSpec represents a requirement for either the width or the height. 13748 * A MeasureSpec is comprised of a size and a mode. There are three possible 13749 * modes: 13750 * <dl> 13751 * <dt>UNSPECIFIED</dt> 13752 * <dd> 13753 * The parent has not imposed any constraint on the child. It can be whatever size 13754 * it wants. 13755 * </dd> 13756 * 13757 * <dt>EXACTLY</dt> 13758 * <dd> 13759 * The parent has determined an exact size for the child. The child is going to be 13760 * given those bounds regardless of how big it wants to be. 13761 * </dd> 13762 * 13763 * <dt>AT_MOST</dt> 13764 * <dd> 13765 * The child can be as large as it wants up to the specified size. 13766 * </dd> 13767 * </dl> 13768 * 13769 * MeasureSpecs are implemented as ints to reduce object allocation. This class 13770 * is provided to pack and unpack the <size, mode> tuple into the int. 13771 */ 13772 public static class MeasureSpec { 13773 private static final int MODE_SHIFT = 30; 13774 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 13775 13776 /** 13777 * Measure specification mode: The parent has not imposed any constraint 13778 * on the child. It can be whatever size it wants. 13779 */ 13780 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 13781 13782 /** 13783 * Measure specification mode: The parent has determined an exact size 13784 * for the child. The child is going to be given those bounds regardless 13785 * of how big it wants to be. 13786 */ 13787 public static final int EXACTLY = 1 << MODE_SHIFT; 13788 13789 /** 13790 * Measure specification mode: The child can be as large as it wants up 13791 * to the specified size. 13792 */ 13793 public static final int AT_MOST = 2 << MODE_SHIFT; 13794 13795 /** 13796 * Creates a measure specification based on the supplied size and mode. 13797 * 13798 * The mode must always be one of the following: 13799 * <ul> 13800 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 13801 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 13802 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 13803 * </ul> 13804 * 13805 * @param size the size of the measure specification 13806 * @param mode the mode of the measure specification 13807 * @return the measure specification based on size and mode 13808 */ 13809 public static int makeMeasureSpec(int size, int mode) { 13810 return size + mode; 13811 } 13812 13813 /** 13814 * Extracts the mode from the supplied measure specification. 13815 * 13816 * @param measureSpec the measure specification to extract the mode from 13817 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 13818 * {@link android.view.View.MeasureSpec#AT_MOST} or 13819 * {@link android.view.View.MeasureSpec#EXACTLY} 13820 */ 13821 public static int getMode(int measureSpec) { 13822 return (measureSpec & MODE_MASK); 13823 } 13824 13825 /** 13826 * Extracts the size from the supplied measure specification. 13827 * 13828 * @param measureSpec the measure specification to extract the size from 13829 * @return the size in pixels defined in the supplied measure specification 13830 */ 13831 public static int getSize(int measureSpec) { 13832 return (measureSpec & ~MODE_MASK); 13833 } 13834 13835 /** 13836 * Returns a String representation of the specified measure 13837 * specification. 13838 * 13839 * @param measureSpec the measure specification to convert to a String 13840 * @return a String with the following format: "MeasureSpec: MODE SIZE" 13841 */ 13842 public static String toString(int measureSpec) { 13843 int mode = getMode(measureSpec); 13844 int size = getSize(measureSpec); 13845 13846 StringBuilder sb = new StringBuilder("MeasureSpec: "); 13847 13848 if (mode == UNSPECIFIED) 13849 sb.append("UNSPECIFIED "); 13850 else if (mode == EXACTLY) 13851 sb.append("EXACTLY "); 13852 else if (mode == AT_MOST) 13853 sb.append("AT_MOST "); 13854 else 13855 sb.append(mode).append(" "); 13856 13857 sb.append(size); 13858 return sb.toString(); 13859 } 13860 } 13861 13862 class CheckForLongPress implements Runnable { 13863 13864 private int mOriginalWindowAttachCount; 13865 13866 public void run() { 13867 if (isPressed() && (mParent != null) 13868 && mOriginalWindowAttachCount == mWindowAttachCount) { 13869 if (performLongClick()) { 13870 mHasPerformedLongPress = true; 13871 } 13872 } 13873 } 13874 13875 public void rememberWindowAttachCount() { 13876 mOriginalWindowAttachCount = mWindowAttachCount; 13877 } 13878 } 13879 13880 private final class CheckForTap implements Runnable { 13881 public void run() { 13882 mPrivateFlags &= ~PREPRESSED; 13883 mPrivateFlags |= PRESSED; 13884 refreshDrawableState(); 13885 checkForLongClick(ViewConfiguration.getTapTimeout()); 13886 } 13887 } 13888 13889 private final class PerformClick implements Runnable { 13890 public void run() { 13891 performClick(); 13892 } 13893 } 13894 13895 /** @hide */ 13896 public void hackTurnOffWindowResizeAnim(boolean off) { 13897 mAttachInfo.mTurnOffWindowResizeAnim = off; 13898 } 13899 13900 /** 13901 * This method returns a ViewPropertyAnimator object, which can be used to animate 13902 * specific properties on this View. 13903 * 13904 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 13905 */ 13906 public ViewPropertyAnimator animate() { 13907 if (mAnimator == null) { 13908 mAnimator = new ViewPropertyAnimator(this); 13909 } 13910 return mAnimator; 13911 } 13912 13913 /** 13914 * Interface definition for a callback to be invoked when a key event is 13915 * dispatched to this view. The callback will be invoked before the key 13916 * event is given to the view. 13917 */ 13918 public interface OnKeyListener { 13919 /** 13920 * Called when a key is dispatched to a view. This allows listeners to 13921 * get a chance to respond before the target view. 13922 * 13923 * @param v The view the key has been dispatched to. 13924 * @param keyCode The code for the physical key that was pressed 13925 * @param event The KeyEvent object containing full information about 13926 * the event. 13927 * @return True if the listener has consumed the event, false otherwise. 13928 */ 13929 boolean onKey(View v, int keyCode, KeyEvent event); 13930 } 13931 13932 /** 13933 * Interface definition for a callback to be invoked when a touch event is 13934 * dispatched to this view. The callback will be invoked before the touch 13935 * event is given to the view. 13936 */ 13937 public interface OnTouchListener { 13938 /** 13939 * Called when a touch event is dispatched to a view. This allows listeners to 13940 * get a chance to respond before the target view. 13941 * 13942 * @param v The view the touch event has been dispatched to. 13943 * @param event The MotionEvent object containing full information about 13944 * the event. 13945 * @return True if the listener has consumed the event, false otherwise. 13946 */ 13947 boolean onTouch(View v, MotionEvent event); 13948 } 13949 13950 /** 13951 * Interface definition for a callback to be invoked when a hover event is 13952 * dispatched to this view. The callback will be invoked before the hover 13953 * event is given to the view. 13954 */ 13955 public interface OnHoverListener { 13956 /** 13957 * Called when a hover event is dispatched to a view. This allows listeners to 13958 * get a chance to respond before the target view. 13959 * 13960 * @param v The view the hover event has been dispatched to. 13961 * @param event The MotionEvent object containing full information about 13962 * the event. 13963 * @return True if the listener has consumed the event, false otherwise. 13964 */ 13965 boolean onHover(View v, MotionEvent event); 13966 } 13967 13968 /** 13969 * Interface definition for a callback to be invoked when a generic motion event is 13970 * dispatched to this view. The callback will be invoked before the generic motion 13971 * event is given to the view. 13972 */ 13973 public interface OnGenericMotionListener { 13974 /** 13975 * Called when a generic motion event is dispatched to a view. This allows listeners to 13976 * get a chance to respond before the target view. 13977 * 13978 * @param v The view the generic motion event has been dispatched to. 13979 * @param event The MotionEvent object containing full information about 13980 * the event. 13981 * @return True if the listener has consumed the event, false otherwise. 13982 */ 13983 boolean onGenericMotion(View v, MotionEvent event); 13984 } 13985 13986 /** 13987 * Interface definition for a callback to be invoked when a view has been clicked and held. 13988 */ 13989 public interface OnLongClickListener { 13990 /** 13991 * Called when a view has been clicked and held. 13992 * 13993 * @param v The view that was clicked and held. 13994 * 13995 * @return true if the callback consumed the long click, false otherwise. 13996 */ 13997 boolean onLongClick(View v); 13998 } 13999 14000 /** 14001 * Interface definition for a callback to be invoked when a drag is being dispatched 14002 * to this view. The callback will be invoked before the hosting view's own 14003 * onDrag(event) method. If the listener wants to fall back to the hosting view's 14004 * onDrag(event) behavior, it should return 'false' from this callback. 14005 */ 14006 public interface OnDragListener { 14007 /** 14008 * Called when a drag event is dispatched to a view. This allows listeners 14009 * to get a chance to override base View behavior. 14010 * 14011 * @param v The View that received the drag event. 14012 * @param event The {@link android.view.DragEvent} object for the drag event. 14013 * @return {@code true} if the drag event was handled successfully, or {@code false} 14014 * if the drag event was not handled. Note that {@code false} will trigger the View 14015 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 14016 */ 14017 boolean onDrag(View v, DragEvent event); 14018 } 14019 14020 /** 14021 * Interface definition for a callback to be invoked when the focus state of 14022 * a view changed. 14023 */ 14024 public interface OnFocusChangeListener { 14025 /** 14026 * Called when the focus state of a view has changed. 14027 * 14028 * @param v The view whose state has changed. 14029 * @param hasFocus The new focus state of v. 14030 */ 14031 void onFocusChange(View v, boolean hasFocus); 14032 } 14033 14034 /** 14035 * Interface definition for a callback to be invoked when a view is clicked. 14036 */ 14037 public interface OnClickListener { 14038 /** 14039 * Called when a view has been clicked. 14040 * 14041 * @param v The view that was clicked. 14042 */ 14043 void onClick(View v); 14044 } 14045 14046 /** 14047 * Interface definition for a callback to be invoked when the context menu 14048 * for this view is being built. 14049 */ 14050 public interface OnCreateContextMenuListener { 14051 /** 14052 * Called when the context menu for this view is being built. It is not 14053 * safe to hold onto the menu after this method returns. 14054 * 14055 * @param menu The context menu that is being built 14056 * @param v The view for which the context menu is being built 14057 * @param menuInfo Extra information about the item for which the 14058 * context menu should be shown. This information will vary 14059 * depending on the class of v. 14060 */ 14061 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 14062 } 14063 14064 /** 14065 * Interface definition for a callback to be invoked when the status bar changes 14066 * visibility. 14067 * 14068 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 14069 */ 14070 public interface OnSystemUiVisibilityChangeListener { 14071 /** 14072 * Called when the status bar changes visibility because of a call to 14073 * {@link View#setSystemUiVisibility(int)}. 14074 * 14075 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 14076 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 14077 */ 14078 public void onSystemUiVisibilityChange(int visibility); 14079 } 14080 14081 /** 14082 * Interface definition for a callback to be invoked when this view is attached 14083 * or detached from its window. 14084 */ 14085 public interface OnAttachStateChangeListener { 14086 /** 14087 * Called when the view is attached to a window. 14088 * @param v The view that was attached 14089 */ 14090 public void onViewAttachedToWindow(View v); 14091 /** 14092 * Called when the view is detached from a window. 14093 * @param v The view that was detached 14094 */ 14095 public void onViewDetachedFromWindow(View v); 14096 } 14097 14098 private final class UnsetPressedState implements Runnable { 14099 public void run() { 14100 setPressed(false); 14101 } 14102 } 14103 14104 /** 14105 * Base class for derived classes that want to save and restore their own 14106 * state in {@link android.view.View#onSaveInstanceState()}. 14107 */ 14108 public static class BaseSavedState extends AbsSavedState { 14109 /** 14110 * Constructor used when reading from a parcel. Reads the state of the superclass. 14111 * 14112 * @param source 14113 */ 14114 public BaseSavedState(Parcel source) { 14115 super(source); 14116 } 14117 14118 /** 14119 * Constructor called by derived classes when creating their SavedState objects 14120 * 14121 * @param superState The state of the superclass of this view 14122 */ 14123 public BaseSavedState(Parcelable superState) { 14124 super(superState); 14125 } 14126 14127 public static final Parcelable.Creator<BaseSavedState> CREATOR = 14128 new Parcelable.Creator<BaseSavedState>() { 14129 public BaseSavedState createFromParcel(Parcel in) { 14130 return new BaseSavedState(in); 14131 } 14132 14133 public BaseSavedState[] newArray(int size) { 14134 return new BaseSavedState[size]; 14135 } 14136 }; 14137 } 14138 14139 /** 14140 * A set of information given to a view when it is attached to its parent 14141 * window. 14142 */ 14143 static class AttachInfo { 14144 interface Callbacks { 14145 void playSoundEffect(int effectId); 14146 boolean performHapticFeedback(int effectId, boolean always); 14147 } 14148 14149 /** 14150 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 14151 * to a Handler. This class contains the target (View) to invalidate and 14152 * the coordinates of the dirty rectangle. 14153 * 14154 * For performance purposes, this class also implements a pool of up to 14155 * POOL_LIMIT objects that get reused. This reduces memory allocations 14156 * whenever possible. 14157 */ 14158 static class InvalidateInfo implements Poolable<InvalidateInfo> { 14159 private static final int POOL_LIMIT = 10; 14160 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 14161 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 14162 public InvalidateInfo newInstance() { 14163 return new InvalidateInfo(); 14164 } 14165 14166 public void onAcquired(InvalidateInfo element) { 14167 } 14168 14169 public void onReleased(InvalidateInfo element) { 14170 element.target = null; 14171 } 14172 }, POOL_LIMIT) 14173 ); 14174 14175 private InvalidateInfo mNext; 14176 private boolean mIsPooled; 14177 14178 View target; 14179 14180 int left; 14181 int top; 14182 int right; 14183 int bottom; 14184 14185 public void setNextPoolable(InvalidateInfo element) { 14186 mNext = element; 14187 } 14188 14189 public InvalidateInfo getNextPoolable() { 14190 return mNext; 14191 } 14192 14193 static InvalidateInfo acquire() { 14194 return sPool.acquire(); 14195 } 14196 14197 void release() { 14198 sPool.release(this); 14199 } 14200 14201 public boolean isPooled() { 14202 return mIsPooled; 14203 } 14204 14205 public void setPooled(boolean isPooled) { 14206 mIsPooled = isPooled; 14207 } 14208 } 14209 14210 final IWindowSession mSession; 14211 14212 final IWindow mWindow; 14213 14214 final IBinder mWindowToken; 14215 14216 final Callbacks mRootCallbacks; 14217 14218 HardwareCanvas mHardwareCanvas; 14219 14220 /** 14221 * The top view of the hierarchy. 14222 */ 14223 View mRootView; 14224 14225 IBinder mPanelParentWindowToken; 14226 Surface mSurface; 14227 14228 boolean mHardwareAccelerated; 14229 boolean mHardwareAccelerationRequested; 14230 HardwareRenderer mHardwareRenderer; 14231 14232 /** 14233 * Scale factor used by the compatibility mode 14234 */ 14235 float mApplicationScale; 14236 14237 /** 14238 * Indicates whether the application is in compatibility mode 14239 */ 14240 boolean mScalingRequired; 14241 14242 /** 14243 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 14244 */ 14245 boolean mTurnOffWindowResizeAnim; 14246 14247 /** 14248 * Left position of this view's window 14249 */ 14250 int mWindowLeft; 14251 14252 /** 14253 * Top position of this view's window 14254 */ 14255 int mWindowTop; 14256 14257 /** 14258 * Indicates whether views need to use 32-bit drawing caches 14259 */ 14260 boolean mUse32BitDrawingCache; 14261 14262 /** 14263 * For windows that are full-screen but using insets to layout inside 14264 * of the screen decorations, these are the current insets for the 14265 * content of the window. 14266 */ 14267 final Rect mContentInsets = new Rect(); 14268 14269 /** 14270 * For windows that are full-screen but using insets to layout inside 14271 * of the screen decorations, these are the current insets for the 14272 * actual visible parts of the window. 14273 */ 14274 final Rect mVisibleInsets = new Rect(); 14275 14276 /** 14277 * The internal insets given by this window. This value is 14278 * supplied by the client (through 14279 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 14280 * be given to the window manager when changed to be used in laying 14281 * out windows behind it. 14282 */ 14283 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 14284 = new ViewTreeObserver.InternalInsetsInfo(); 14285 14286 /** 14287 * All views in the window's hierarchy that serve as scroll containers, 14288 * used to determine if the window can be resized or must be panned 14289 * to adjust for a soft input area. 14290 */ 14291 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 14292 14293 final KeyEvent.DispatcherState mKeyDispatchState 14294 = new KeyEvent.DispatcherState(); 14295 14296 /** 14297 * Indicates whether the view's window currently has the focus. 14298 */ 14299 boolean mHasWindowFocus; 14300 14301 /** 14302 * The current visibility of the window. 14303 */ 14304 int mWindowVisibility; 14305 14306 /** 14307 * Indicates the time at which drawing started to occur. 14308 */ 14309 long mDrawingTime; 14310 14311 /** 14312 * Indicates whether or not ignoring the DIRTY_MASK flags. 14313 */ 14314 boolean mIgnoreDirtyState; 14315 14316 /** 14317 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 14318 * to avoid clearing that flag prematurely. 14319 */ 14320 boolean mSetIgnoreDirtyState = false; 14321 14322 /** 14323 * Indicates whether the view's window is currently in touch mode. 14324 */ 14325 boolean mInTouchMode; 14326 14327 /** 14328 * Indicates that ViewAncestor should trigger a global layout change 14329 * the next time it performs a traversal 14330 */ 14331 boolean mRecomputeGlobalAttributes; 14332 14333 /** 14334 * Set during a traveral if any views want to keep the screen on. 14335 */ 14336 boolean mKeepScreenOn; 14337 14338 /** 14339 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 14340 */ 14341 int mSystemUiVisibility; 14342 14343 /** 14344 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 14345 * attached. 14346 */ 14347 boolean mHasSystemUiListeners; 14348 14349 /** 14350 * Set if the visibility of any views has changed. 14351 */ 14352 boolean mViewVisibilityChanged; 14353 14354 /** 14355 * Set to true if a view has been scrolled. 14356 */ 14357 boolean mViewScrollChanged; 14358 14359 /** 14360 * Global to the view hierarchy used as a temporary for dealing with 14361 * x/y points in the transparent region computations. 14362 */ 14363 final int[] mTransparentLocation = new int[2]; 14364 14365 /** 14366 * Global to the view hierarchy used as a temporary for dealing with 14367 * x/y points in the ViewGroup.invalidateChild implementation. 14368 */ 14369 final int[] mInvalidateChildLocation = new int[2]; 14370 14371 14372 /** 14373 * Global to the view hierarchy used as a temporary for dealing with 14374 * x/y location when view is transformed. 14375 */ 14376 final float[] mTmpTransformLocation = new float[2]; 14377 14378 /** 14379 * The view tree observer used to dispatch global events like 14380 * layout, pre-draw, touch mode change, etc. 14381 */ 14382 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 14383 14384 /** 14385 * A Canvas used by the view hierarchy to perform bitmap caching. 14386 */ 14387 Canvas mCanvas; 14388 14389 /** 14390 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 14391 * handler can be used to pump events in the UI events queue. 14392 */ 14393 final Handler mHandler; 14394 14395 /** 14396 * Identifier for messages requesting the view to be invalidated. 14397 * Such messages should be sent to {@link #mHandler}. 14398 */ 14399 static final int INVALIDATE_MSG = 0x1; 14400 14401 /** 14402 * Identifier for messages requesting the view to invalidate a region. 14403 * Such messages should be sent to {@link #mHandler}. 14404 */ 14405 static final int INVALIDATE_RECT_MSG = 0x2; 14406 14407 /** 14408 * Temporary for use in computing invalidate rectangles while 14409 * calling up the hierarchy. 14410 */ 14411 final Rect mTmpInvalRect = new Rect(); 14412 14413 /** 14414 * Temporary for use in computing hit areas with transformed views 14415 */ 14416 final RectF mTmpTransformRect = new RectF(); 14417 14418 /** 14419 * Temporary list for use in collecting focusable descendents of a view. 14420 */ 14421 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 14422 14423 /** 14424 * The id of the window for accessibility purposes. 14425 */ 14426 int mAccessibilityWindowId = View.NO_ID; 14427 14428 /** 14429 * Creates a new set of attachment information with the specified 14430 * events handler and thread. 14431 * 14432 * @param handler the events handler the view must use 14433 */ 14434 AttachInfo(IWindowSession session, IWindow window, 14435 Handler handler, Callbacks effectPlayer) { 14436 mSession = session; 14437 mWindow = window; 14438 mWindowToken = window.asBinder(); 14439 mHandler = handler; 14440 mRootCallbacks = effectPlayer; 14441 } 14442 } 14443 14444 /** 14445 * <p>ScrollabilityCache holds various fields used by a View when scrolling 14446 * is supported. This avoids keeping too many unused fields in most 14447 * instances of View.</p> 14448 */ 14449 private static class ScrollabilityCache implements Runnable { 14450 14451 /** 14452 * Scrollbars are not visible 14453 */ 14454 public static final int OFF = 0; 14455 14456 /** 14457 * Scrollbars are visible 14458 */ 14459 public static final int ON = 1; 14460 14461 /** 14462 * Scrollbars are fading away 14463 */ 14464 public static final int FADING = 2; 14465 14466 public boolean fadeScrollBars; 14467 14468 public int fadingEdgeLength; 14469 public int scrollBarDefaultDelayBeforeFade; 14470 public int scrollBarFadeDuration; 14471 14472 public int scrollBarSize; 14473 public ScrollBarDrawable scrollBar; 14474 public float[] interpolatorValues; 14475 public View host; 14476 14477 public final Paint paint; 14478 public final Matrix matrix; 14479 public Shader shader; 14480 14481 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 14482 14483 private static final float[] OPAQUE = { 255 }; 14484 private static final float[] TRANSPARENT = { 0.0f }; 14485 14486 /** 14487 * When fading should start. This time moves into the future every time 14488 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 14489 */ 14490 public long fadeStartTime; 14491 14492 14493 /** 14494 * The current state of the scrollbars: ON, OFF, or FADING 14495 */ 14496 public int state = OFF; 14497 14498 private int mLastColor; 14499 14500 public ScrollabilityCache(ViewConfiguration configuration, View host) { 14501 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 14502 scrollBarSize = configuration.getScaledScrollBarSize(); 14503 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 14504 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 14505 14506 paint = new Paint(); 14507 matrix = new Matrix(); 14508 // use use a height of 1, and then wack the matrix each time we 14509 // actually use it. 14510 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 14511 14512 paint.setShader(shader); 14513 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 14514 this.host = host; 14515 } 14516 14517 public void setFadeColor(int color) { 14518 if (color != 0 && color != mLastColor) { 14519 mLastColor = color; 14520 color |= 0xFF000000; 14521 14522 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 14523 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 14524 14525 paint.setShader(shader); 14526 // Restore the default transfer mode (src_over) 14527 paint.setXfermode(null); 14528 } 14529 } 14530 14531 public void run() { 14532 long now = AnimationUtils.currentAnimationTimeMillis(); 14533 if (now >= fadeStartTime) { 14534 14535 // the animation fades the scrollbars out by changing 14536 // the opacity (alpha) from fully opaque to fully 14537 // transparent 14538 int nextFrame = (int) now; 14539 int framesCount = 0; 14540 14541 Interpolator interpolator = scrollBarInterpolator; 14542 14543 // Start opaque 14544 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 14545 14546 // End transparent 14547 nextFrame += scrollBarFadeDuration; 14548 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 14549 14550 state = FADING; 14551 14552 // Kick off the fade animation 14553 host.invalidate(true); 14554 } 14555 } 14556 } 14557 14558 /** 14559 * Resuable callback for sending 14560 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 14561 */ 14562 private class SendViewScrolledAccessibilityEvent implements Runnable { 14563 public volatile boolean mIsPending; 14564 14565 public void run() { 14566 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 14567 mIsPending = false; 14568 } 14569 } 14570 14571 /** 14572 * <p> 14573 * This class represents a delegate that can be registered in a {@link View} 14574 * to enhance accessibility support via composition rather via inheritance. 14575 * It is specifically targeted to widget developers that extend basic View 14576 * classes i.e. classes in package android.view, that would like their 14577 * applications to be backwards compatible. 14578 * </p> 14579 * <p> 14580 * A scenario in which a developer would like to use an accessibility delegate 14581 * is overriding a method introduced in a later API version then the minimal API 14582 * version supported by the application. For example, the method 14583 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 14584 * in API version 4 when the accessibility APIs were first introduced. If a 14585 * developer would like his application to run on API version 4 devices (assuming 14586 * all other APIs used by the application are version 4 or lower) and take advantage 14587 * of this method, instead of overriding the method which would break the application's 14588 * backwards compatibility, he can override the corresponding method in this 14589 * delegate and register the delegate in the target View if the API version of 14590 * the system is high enough i.e. the API version is same or higher to the API 14591 * version that introduced 14592 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 14593 * </p> 14594 * <p> 14595 * Here is an example implementation: 14596 * </p> 14597 * <code><pre><p> 14598 * if (Build.VERSION.SDK_INT >= 14) { 14599 * // If the API version is equal of higher than the version in 14600 * // which onInitializeAccessibilityNodeInfo was introduced we 14601 * // register a delegate with a customized implementation. 14602 * View view = findViewById(R.id.view_id); 14603 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 14604 * public void onInitializeAccessibilityNodeInfo(View host, 14605 * AccessibilityNodeInfo info) { 14606 * // Let the default implementation populate the info. 14607 * super.onInitializeAccessibilityNodeInfo(host, info); 14608 * // Set some other information. 14609 * info.setEnabled(host.isEnabled()); 14610 * } 14611 * }); 14612 * } 14613 * </code></pre></p> 14614 * <p> 14615 * This delegate contains methods that correspond to the accessibility methods 14616 * in View. If a delegate has been specified the implementation in View hands 14617 * off handling to the corresponding method in this delegate. The default 14618 * implementation the delegate methods behaves exactly as the corresponding 14619 * method in View for the case of no accessibility delegate been set. Hence, 14620 * to customize the behavior of a View method, clients can override only the 14621 * corresponding delegate method without altering the behavior of the rest 14622 * accessibility related methods of the host view. 14623 * </p> 14624 */ 14625 public static class AccessibilityDelegate { 14626 14627 /** 14628 * Sends an accessibility event of the given type. If accessibility is not 14629 * enabled this method has no effect. 14630 * <p> 14631 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 14632 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 14633 * been set. 14634 * </p> 14635 * 14636 * @param host The View hosting the delegate. 14637 * @param eventType The type of the event to send. 14638 * 14639 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 14640 */ 14641 public void sendAccessibilityEvent(View host, int eventType) { 14642 host.sendAccessibilityEventInternal(eventType); 14643 } 14644 14645 /** 14646 * Sends an accessibility event. This method behaves exactly as 14647 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 14648 * empty {@link AccessibilityEvent} and does not perform a check whether 14649 * accessibility is enabled. 14650 * <p> 14651 * The default implementation behaves as 14652 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 14653 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 14654 * the case of no accessibility delegate been set. 14655 * </p> 14656 * 14657 * @param host The View hosting the delegate. 14658 * @param event The event to send. 14659 * 14660 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 14661 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 14662 */ 14663 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 14664 host.sendAccessibilityEventUncheckedInternal(event); 14665 } 14666 14667 /** 14668 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 14669 * to its children for adding their text content to the event. 14670 * <p> 14671 * The default implementation behaves as 14672 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 14673 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 14674 * the case of no accessibility delegate been set. 14675 * </p> 14676 * 14677 * @param host The View hosting the delegate. 14678 * @param event The event. 14679 * @return True if the event population was completed. 14680 * 14681 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 14682 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 14683 */ 14684 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 14685 return host.dispatchPopulateAccessibilityEventInternal(event); 14686 } 14687 14688 /** 14689 * Gives a chance to the host View to populate the accessibility event with its 14690 * text content. 14691 * <p> 14692 * The default implementation behaves as 14693 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 14694 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 14695 * the case of no accessibility delegate been set. 14696 * </p> 14697 * 14698 * @param host The View hosting the delegate. 14699 * @param event The accessibility event which to populate. 14700 * 14701 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 14702 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 14703 */ 14704 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 14705 host.onPopulateAccessibilityEventInternal(event); 14706 } 14707 14708 /** 14709 * Initializes an {@link AccessibilityEvent} with information about the 14710 * the host View which is the event source. 14711 * <p> 14712 * The default implementation behaves as 14713 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 14714 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 14715 * the case of no accessibility delegate been set. 14716 * </p> 14717 * 14718 * @param host The View hosting the delegate. 14719 * @param event The event to initialize. 14720 * 14721 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 14722 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 14723 */ 14724 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 14725 host.onInitializeAccessibilityEventInternal(event); 14726 } 14727 14728 /** 14729 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 14730 * <p> 14731 * The default implementation behaves as 14732 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 14733 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 14734 * the case of no accessibility delegate been set. 14735 * </p> 14736 * 14737 * @param host The View hosting the delegate. 14738 * @param info The instance to initialize. 14739 * 14740 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 14741 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 14742 */ 14743 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 14744 host.onInitializeAccessibilityNodeInfoInternal(info); 14745 } 14746 14747 /** 14748 * Called when a child of the host View has requested sending an 14749 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 14750 * to augment the event. 14751 * <p> 14752 * The default implementation behaves as 14753 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 14754 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 14755 * the case of no accessibility delegate been set. 14756 * </p> 14757 * 14758 * @param host The View hosting the delegate. 14759 * @param child The child which requests sending the event. 14760 * @param event The event to be sent. 14761 * @return True if the event should be sent 14762 * 14763 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 14764 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 14765 */ 14766 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 14767 AccessibilityEvent event) { 14768 return host.onRequestSendAccessibilityEventInternal(child, event); 14769 } 14770 } 14771} 14772