View.java revision 53f2531ba7bc72489d03fd17b6ce29c811fad8b5
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.util.AttributeSet; 49import android.util.FloatProperty; 50import android.util.LocaleUtil; 51import android.util.Log; 52import android.util.Pool; 53import android.util.Poolable; 54import android.util.PoolableManager; 55import android.util.Pools; 56import android.util.Property; 57import android.util.SparseArray; 58import android.util.TypedValue; 59import android.view.ContextMenu.ContextMenuInfo; 60import android.view.accessibility.AccessibilityEvent; 61import android.view.accessibility.AccessibilityEventSource; 62import android.view.accessibility.AccessibilityManager; 63import android.view.accessibility.AccessibilityNodeInfo; 64import android.view.animation.Animation; 65import android.view.animation.AnimationUtils; 66import android.view.inputmethod.EditorInfo; 67import android.view.inputmethod.InputConnection; 68import android.view.inputmethod.InputMethodManager; 69import android.widget.ScrollBarDrawable; 70 71import com.android.internal.R; 72import com.android.internal.util.Predicate; 73import com.android.internal.view.menu.MenuBuilder; 74 75import java.lang.ref.WeakReference; 76import java.lang.reflect.InvocationTargetException; 77import java.lang.reflect.Method; 78import java.util.ArrayList; 79import java.util.Arrays; 80import java.util.Locale; 81import java.util.WeakHashMap; 82import java.util.concurrent.CopyOnWriteArrayList; 83 84/** 85 * <p> 86 * This class represents the basic building block for user interface components. A View 87 * occupies a rectangular area on the screen and is responsible for drawing and 88 * event handling. View is the base class for <em>widgets</em>, which are 89 * used to create interactive UI components (buttons, text fields, etc.). The 90 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 91 * are invisible containers that hold other Views (or other ViewGroups) and define 92 * their layout properties. 93 * </p> 94 * 95 * <div class="special"> 96 * <p>For an introduction to using this class to develop your 97 * application's user interface, read the Developer Guide documentation on 98 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 99 * include: 100 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 103 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 104 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 105 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 106 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 107 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 108 * </p> 109 * </div> 110 * 111 * <a name="Using"></a> 112 * <h3>Using Views</h3> 113 * <p> 114 * All of the views in a window are arranged in a single tree. You can add views 115 * either from code or by specifying a tree of views in one or more XML layout 116 * files. There are many specialized subclasses of views that act as controls or 117 * are capable of displaying text, images, or other content. 118 * </p> 119 * <p> 120 * Once you have created a tree of views, there are typically a few types of 121 * common operations you may wish to perform: 122 * <ul> 123 * <li><strong>Set properties:</strong> for example setting the text of a 124 * {@link android.widget.TextView}. The available properties and the methods 125 * that set them will vary among the different subclasses of views. Note that 126 * properties that are known at build time can be set in the XML layout 127 * files.</li> 128 * <li><strong>Set focus:</strong> The framework will handled moving focus in 129 * response to user input. To force focus to a specific view, call 130 * {@link #requestFocus}.</li> 131 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 132 * that will be notified when something interesting happens to the view. For 133 * example, all views will let you set a listener to be notified when the view 134 * gains or loses focus. You can register such a listener using 135 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 136 * Other view subclasses offer more specialized listeners. For example, a Button 137 * exposes a listener to notify clients when the button is clicked.</li> 138 * <li><strong>Set visibility:</strong> You can hide or show views using 139 * {@link #setVisibility(int)}.</li> 140 * </ul> 141 * </p> 142 * <p><em> 143 * Note: The Android framework is responsible for measuring, laying out and 144 * drawing views. You should not call methods that perform these actions on 145 * views yourself unless you are actually implementing a 146 * {@link android.view.ViewGroup}. 147 * </em></p> 148 * 149 * <a name="Lifecycle"></a> 150 * <h3>Implementing a Custom View</h3> 151 * 152 * <p> 153 * To implement a custom view, you will usually begin by providing overrides for 154 * some of the standard methods that the framework calls on all views. You do 155 * not need to override all of these methods. In fact, you can start by just 156 * overriding {@link #onDraw(android.graphics.Canvas)}. 157 * <table border="2" width="85%" align="center" cellpadding="5"> 158 * <thead> 159 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 160 * </thead> 161 * 162 * <tbody> 163 * <tr> 164 * <td rowspan="2">Creation</td> 165 * <td>Constructors</td> 166 * <td>There is a form of the constructor that are called when the view 167 * is created from code and a form that is called when the view is 168 * inflated from a layout file. The second form should parse and apply 169 * any attributes defined in the layout file. 170 * </td> 171 * </tr> 172 * <tr> 173 * <td><code>{@link #onFinishInflate()}</code></td> 174 * <td>Called after a view and all of its children has been inflated 175 * from XML.</td> 176 * </tr> 177 * 178 * <tr> 179 * <td rowspan="3">Layout</td> 180 * <td><code>{@link #onMeasure(int, int)}</code></td> 181 * <td>Called to determine the size requirements for this view and all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 187 * <td>Called when this view should assign a size and position to all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 193 * <td>Called when the size of this view has changed. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td>Drawing</td> 199 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 200 * <td>Called when the view should render its content. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td rowspan="4">Event processing</td> 206 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 207 * <td>Called when a new key event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 212 * <td>Called when a key up event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 217 * <td>Called when a trackball motion event occurs. 218 * </td> 219 * </tr> 220 * <tr> 221 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 222 * <td>Called when a touch screen motion event occurs. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td rowspan="2">Focus</td> 228 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 229 * <td>Called when the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 235 * <td>Called when the window containing the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td rowspan="3">Attaching</td> 241 * <td><code>{@link #onAttachedToWindow()}</code></td> 242 * <td>Called when the view is attached to a window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onDetachedFromWindow}</code></td> 248 * <td>Called when the view is detached from its window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 254 * <td>Called when the visibility of the window containing the view 255 * has changed. 256 * </td> 257 * </tr> 258 * </tbody> 259 * 260 * </table> 261 * </p> 262 * 263 * <a name="IDs"></a> 264 * <h3>IDs</h3> 265 * Views may have an integer id associated with them. These ids are typically 266 * assigned in the layout XML files, and are used to find specific views within 267 * the view tree. A common pattern is to: 268 * <ul> 269 * <li>Define a Button in the layout file and assign it a unique ID. 270 * <pre> 271 * <Button 272 * android:id="@+id/my_button" 273 * android:layout_width="wrap_content" 274 * android:layout_height="wrap_content" 275 * android:text="@string/my_button_text"/> 276 * </pre></li> 277 * <li>From the onCreate method of an Activity, find the Button 278 * <pre class="prettyprint"> 279 * Button myButton = (Button) findViewById(R.id.my_button); 280 * </pre></li> 281 * </ul> 282 * <p> 283 * View IDs need not be unique throughout the tree, but it is good practice to 284 * ensure that they are at least unique within the part of the tree you are 285 * searching. 286 * </p> 287 * 288 * <a name="Position"></a> 289 * <h3>Position</h3> 290 * <p> 291 * The geometry of a view is that of a rectangle. A view has a location, 292 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 293 * two dimensions, expressed as a width and a height. The unit for location 294 * and dimensions is the pixel. 295 * </p> 296 * 297 * <p> 298 * It is possible to retrieve the location of a view by invoking the methods 299 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 300 * coordinate of the rectangle representing the view. The latter returns the 301 * top, or Y, coordinate of the rectangle representing the view. These methods 302 * both return the location of the view relative to its parent. For instance, 303 * when getLeft() returns 20, that means the view is located 20 pixels to the 304 * right of the left edge of its direct parent. 305 * </p> 306 * 307 * <p> 308 * In addition, several convenience methods are offered to avoid unnecessary 309 * computations, namely {@link #getRight()} and {@link #getBottom()}. 310 * These methods return the coordinates of the right and bottom edges of the 311 * rectangle representing the view. For instance, calling {@link #getRight()} 312 * is similar to the following computation: <code>getLeft() + getWidth()</code> 313 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 314 * </p> 315 * 316 * <a name="SizePaddingMargins"></a> 317 * <h3>Size, padding and margins</h3> 318 * <p> 319 * The size of a view is expressed with a width and a height. A view actually 320 * possess two pairs of width and height values. 321 * </p> 322 * 323 * <p> 324 * The first pair is known as <em>measured width</em> and 325 * <em>measured height</em>. These dimensions define how big a view wants to be 326 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 327 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 328 * and {@link #getMeasuredHeight()}. 329 * </p> 330 * 331 * <p> 332 * The second pair is simply known as <em>width</em> and <em>height</em>, or 333 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 334 * dimensions define the actual size of the view on screen, at drawing time and 335 * after layout. These values may, but do not have to, be different from the 336 * measured width and height. The width and height can be obtained by calling 337 * {@link #getWidth()} and {@link #getHeight()}. 338 * </p> 339 * 340 * <p> 341 * To measure its dimensions, a view takes into account its padding. The padding 342 * is expressed in pixels for the left, top, right and bottom parts of the view. 343 * Padding can be used to offset the content of the view by a specific amount of 344 * pixels. For instance, a left padding of 2 will push the view's content by 345 * 2 pixels to the right of the left edge. Padding can be set using the 346 * {@link #setPadding(int, int, int, int)} method and queried by calling 347 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 348 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}. 349 * </p> 350 * 351 * <p> 352 * Even though a view can define a padding, it does not provide any support for 353 * margins. However, view groups provide such a support. Refer to 354 * {@link android.view.ViewGroup} and 355 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 356 * </p> 357 * 358 * <a name="Layout"></a> 359 * <h3>Layout</h3> 360 * <p> 361 * Layout is a two pass process: a measure pass and a layout pass. The measuring 362 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 363 * of the view tree. Each view pushes dimension specifications down the tree 364 * during the recursion. At the end of the measure pass, every view has stored 365 * its measurements. The second pass happens in 366 * {@link #layout(int,int,int,int)} and is also top-down. During 367 * this pass each parent is responsible for positioning all of its children 368 * using the sizes computed in the measure pass. 369 * </p> 370 * 371 * <p> 372 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 373 * {@link #getMeasuredHeight()} values must be set, along with those for all of 374 * that view's descendants. A view's measured width and measured height values 375 * must respect the constraints imposed by the view's parents. This guarantees 376 * that at the end of the measure pass, all parents accept all of their 377 * children's measurements. A parent view may call measure() more than once on 378 * its children. For example, the parent may measure each child once with 379 * unspecified dimensions to find out how big they want to be, then call 380 * measure() on them again with actual numbers if the sum of all the children's 381 * unconstrained sizes is too big or too small. 382 * </p> 383 * 384 * <p> 385 * The measure pass uses two classes to communicate dimensions. The 386 * {@link MeasureSpec} class is used by views to tell their parents how they 387 * want to be measured and positioned. The base LayoutParams class just 388 * describes how big the view wants to be for both width and height. For each 389 * dimension, it can specify one of: 390 * <ul> 391 * <li> an exact number 392 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 393 * (minus padding) 394 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 395 * enclose its content (plus padding). 396 * </ul> 397 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 398 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 399 * an X and Y value. 400 * </p> 401 * 402 * <p> 403 * MeasureSpecs are used to push requirements down the tree from parent to 404 * child. A MeasureSpec can be in one of three modes: 405 * <ul> 406 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 407 * of a child view. For example, a LinearLayout may call measure() on its child 408 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 409 * tall the child view wants to be given a width of 240 pixels. 410 * <li>EXACTLY: This is used by the parent to impose an exact size on the 411 * child. The child must use this size, and guarantee that all of its 412 * descendants will fit within this size. 413 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 414 * child. The child must gurantee that it and all of its descendants will fit 415 * within this size. 416 * </ul> 417 * </p> 418 * 419 * <p> 420 * To intiate a layout, call {@link #requestLayout}. This method is typically 421 * called by a view on itself when it believes that is can no longer fit within 422 * its current bounds. 423 * </p> 424 * 425 * <a name="Drawing"></a> 426 * <h3>Drawing</h3> 427 * <p> 428 * Drawing is handled by walking the tree and rendering each view that 429 * intersects the the invalid region. Because the tree is traversed in-order, 430 * this means that parents will draw before (i.e., behind) their children, with 431 * siblings drawn in the order they appear in the tree. 432 * If you set a background drawable for a View, then the View will draw it for you 433 * before calling back to its <code>onDraw()</code> method. 434 * </p> 435 * 436 * <p> 437 * Note that the framework will not draw views that are not in the invalid region. 438 * </p> 439 * 440 * <p> 441 * To force a view to draw, call {@link #invalidate()}. 442 * </p> 443 * 444 * <a name="EventHandlingThreading"></a> 445 * <h3>Event Handling and Threading</h3> 446 * <p> 447 * The basic cycle of a view is as follows: 448 * <ol> 449 * <li>An event comes in and is dispatched to the appropriate view. The view 450 * handles the event and notifies any listeners.</li> 451 * <li>If in the course of processing the event, the view's bounds may need 452 * to be changed, the view will call {@link #requestLayout()}.</li> 453 * <li>Similarly, if in the course of processing the event the view's appearance 454 * may need to be changed, the view will call {@link #invalidate()}.</li> 455 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 456 * the framework will take care of measuring, laying out, and drawing the tree 457 * as appropriate.</li> 458 * </ol> 459 * </p> 460 * 461 * <p><em>Note: The entire view tree is single threaded. You must always be on 462 * the UI thread when calling any method on any view.</em> 463 * If you are doing work on other threads and want to update the state of a view 464 * from that thread, you should use a {@link Handler}. 465 * </p> 466 * 467 * <a name="FocusHandling"></a> 468 * <h3>Focus Handling</h3> 469 * <p> 470 * The framework will handle routine focus movement in response to user input. 471 * This includes changing the focus as views are removed or hidden, or as new 472 * views become available. Views indicate their willingness to take focus 473 * through the {@link #isFocusable} method. To change whether a view can take 474 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 475 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 476 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 477 * </p> 478 * <p> 479 * Focus movement is based on an algorithm which finds the nearest neighbor in a 480 * given direction. In rare cases, the default algorithm may not match the 481 * intended behavior of the developer. In these situations, you can provide 482 * explicit overrides by using these XML attributes in the layout file: 483 * <pre> 484 * nextFocusDown 485 * nextFocusLeft 486 * nextFocusRight 487 * nextFocusUp 488 * </pre> 489 * </p> 490 * 491 * 492 * <p> 493 * To get a particular view to take focus, call {@link #requestFocus()}. 494 * </p> 495 * 496 * <a name="TouchMode"></a> 497 * <h3>Touch Mode</h3> 498 * <p> 499 * When a user is navigating a user interface via directional keys such as a D-pad, it is 500 * necessary to give focus to actionable items such as buttons so the user can see 501 * what will take input. If the device has touch capabilities, however, and the user 502 * begins interacting with the interface by touching it, it is no longer necessary to 503 * always highlight, or give focus to, a particular view. This motivates a mode 504 * for interaction named 'touch mode'. 505 * </p> 506 * <p> 507 * For a touch capable device, once the user touches the screen, the device 508 * will enter touch mode. From this point onward, only views for which 509 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 510 * Other views that are touchable, like buttons, will not take focus when touched; they will 511 * only fire the on click listeners. 512 * </p> 513 * <p> 514 * Any time a user hits a directional key, such as a D-pad direction, the view device will 515 * exit touch mode, and find a view to take focus, so that the user may resume interacting 516 * with the user interface without touching the screen again. 517 * </p> 518 * <p> 519 * The touch mode state is maintained across {@link android.app.Activity}s. Call 520 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 521 * </p> 522 * 523 * <a name="Scrolling"></a> 524 * <h3>Scrolling</h3> 525 * <p> 526 * The framework provides basic support for views that wish to internally 527 * scroll their content. This includes keeping track of the X and Y scroll 528 * offset as well as mechanisms for drawing scrollbars. See 529 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 530 * {@link #awakenScrollBars()} for more details. 531 * </p> 532 * 533 * <a name="Tags"></a> 534 * <h3>Tags</h3> 535 * <p> 536 * Unlike IDs, tags are not used to identify views. Tags are essentially an 537 * extra piece of information that can be associated with a view. They are most 538 * often used as a convenience to store data related to views in the views 539 * themselves rather than by putting them in a separate structure. 540 * </p> 541 * 542 * <a name="Animation"></a> 543 * <h3>Animation</h3> 544 * <p> 545 * You can attach an {@link Animation} object to a view using 546 * {@link #setAnimation(Animation)} or 547 * {@link #startAnimation(Animation)}. The animation can alter the scale, 548 * rotation, translation and alpha of a view over time. If the animation is 549 * attached to a view that has children, the animation will affect the entire 550 * subtree rooted by that node. When an animation is started, the framework will 551 * take care of redrawing the appropriate views until the animation completes. 552 * </p> 553 * <p> 554 * Starting with Android 3.0, the preferred way of animating views is to use the 555 * {@link android.animation} package APIs. 556 * </p> 557 * 558 * <a name="Security"></a> 559 * <h3>Security</h3> 560 * <p> 561 * Sometimes it is essential that an application be able to verify that an action 562 * is being performed with the full knowledge and consent of the user, such as 563 * granting a permission request, making a purchase or clicking on an advertisement. 564 * Unfortunately, a malicious application could try to spoof the user into 565 * performing these actions, unaware, by concealing the intended purpose of the view. 566 * As a remedy, the framework offers a touch filtering mechanism that can be used to 567 * improve the security of views that provide access to sensitive functionality. 568 * </p><p> 569 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 570 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 571 * will discard touches that are received whenever the view's window is obscured by 572 * another visible window. As a result, the view will not receive touches whenever a 573 * toast, dialog or other window appears above the view's window. 574 * </p><p> 575 * For more fine-grained control over security, consider overriding the 576 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 577 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 578 * </p> 579 * 580 * @attr ref android.R.styleable#View_alpha 581 * @attr ref android.R.styleable#View_background 582 * @attr ref android.R.styleable#View_clickable 583 * @attr ref android.R.styleable#View_contentDescription 584 * @attr ref android.R.styleable#View_drawingCacheQuality 585 * @attr ref android.R.styleable#View_duplicateParentState 586 * @attr ref android.R.styleable#View_id 587 * @attr ref android.R.styleable#View_fadingEdge 588 * @attr ref android.R.styleable#View_fadingEdgeLength 589 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 590 * @attr ref android.R.styleable#View_fitsSystemWindows 591 * @attr ref android.R.styleable#View_isScrollContainer 592 * @attr ref android.R.styleable#View_focusable 593 * @attr ref android.R.styleable#View_focusableInTouchMode 594 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 595 * @attr ref android.R.styleable#View_keepScreenOn 596 * @attr ref android.R.styleable#View_layerType 597 * @attr ref android.R.styleable#View_longClickable 598 * @attr ref android.R.styleable#View_minHeight 599 * @attr ref android.R.styleable#View_minWidth 600 * @attr ref android.R.styleable#View_nextFocusDown 601 * @attr ref android.R.styleable#View_nextFocusLeft 602 * @attr ref android.R.styleable#View_nextFocusRight 603 * @attr ref android.R.styleable#View_nextFocusUp 604 * @attr ref android.R.styleable#View_onClick 605 * @attr ref android.R.styleable#View_padding 606 * @attr ref android.R.styleable#View_paddingBottom 607 * @attr ref android.R.styleable#View_paddingLeft 608 * @attr ref android.R.styleable#View_paddingRight 609 * @attr ref android.R.styleable#View_paddingTop 610 * @attr ref android.R.styleable#View_saveEnabled 611 * @attr ref android.R.styleable#View_rotation 612 * @attr ref android.R.styleable#View_rotationX 613 * @attr ref android.R.styleable#View_rotationY 614 * @attr ref android.R.styleable#View_scaleX 615 * @attr ref android.R.styleable#View_scaleY 616 * @attr ref android.R.styleable#View_scrollX 617 * @attr ref android.R.styleable#View_scrollY 618 * @attr ref android.R.styleable#View_scrollbarSize 619 * @attr ref android.R.styleable#View_scrollbarStyle 620 * @attr ref android.R.styleable#View_scrollbars 621 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 622 * @attr ref android.R.styleable#View_scrollbarFadeDuration 623 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 624 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 625 * @attr ref android.R.styleable#View_scrollbarThumbVertical 626 * @attr ref android.R.styleable#View_scrollbarTrackVertical 627 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 628 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 629 * @attr ref android.R.styleable#View_soundEffectsEnabled 630 * @attr ref android.R.styleable#View_tag 631 * @attr ref android.R.styleable#View_transformPivotX 632 * @attr ref android.R.styleable#View_transformPivotY 633 * @attr ref android.R.styleable#View_translationX 634 * @attr ref android.R.styleable#View_translationY 635 * @attr ref android.R.styleable#View_visibility 636 * 637 * @see android.view.ViewGroup 638 */ 639public class View implements Drawable.Callback2, KeyEvent.Callback, AccessibilityEventSource { 640 private static final boolean DBG = false; 641 642 /** 643 * The logging tag used by this class with android.util.Log. 644 */ 645 protected static final String VIEW_LOG_TAG = "View"; 646 647 /** 648 * Used to mark a View that has no ID. 649 */ 650 public static final int NO_ID = -1; 651 652 /** 653 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 654 * calling setFlags. 655 */ 656 private static final int NOT_FOCUSABLE = 0x00000000; 657 658 /** 659 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 660 * setFlags. 661 */ 662 private static final int FOCUSABLE = 0x00000001; 663 664 /** 665 * Mask for use with setFlags indicating bits used for focus. 666 */ 667 private static final int FOCUSABLE_MASK = 0x00000001; 668 669 /** 670 * This view will adjust its padding to fit sytem windows (e.g. status bar) 671 */ 672 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 673 674 /** 675 * This view is visible. 676 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 677 * android:visibility}. 678 */ 679 public static final int VISIBLE = 0x00000000; 680 681 /** 682 * This view is invisible, but it still takes up space for layout purposes. 683 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 684 * android:visibility}. 685 */ 686 public static final int INVISIBLE = 0x00000004; 687 688 /** 689 * This view is invisible, and it doesn't take any space for layout 690 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 691 * android:visibility}. 692 */ 693 public static final int GONE = 0x00000008; 694 695 /** 696 * Mask for use with setFlags indicating bits used for visibility. 697 * {@hide} 698 */ 699 static final int VISIBILITY_MASK = 0x0000000C; 700 701 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 702 703 /** 704 * This view is enabled. Intrepretation varies by subclass. 705 * Use with ENABLED_MASK when calling setFlags. 706 * {@hide} 707 */ 708 static final int ENABLED = 0x00000000; 709 710 /** 711 * This view is disabled. Intrepretation varies by subclass. 712 * Use with ENABLED_MASK when calling setFlags. 713 * {@hide} 714 */ 715 static final int DISABLED = 0x00000020; 716 717 /** 718 * Mask for use with setFlags indicating bits used for indicating whether 719 * this view is enabled 720 * {@hide} 721 */ 722 static final int ENABLED_MASK = 0x00000020; 723 724 /** 725 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 726 * called and further optimizations will be performed. It is okay to have 727 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 728 * {@hide} 729 */ 730 static final int WILL_NOT_DRAW = 0x00000080; 731 732 /** 733 * Mask for use with setFlags indicating bits used for indicating whether 734 * this view is will draw 735 * {@hide} 736 */ 737 static final int DRAW_MASK = 0x00000080; 738 739 /** 740 * <p>This view doesn't show scrollbars.</p> 741 * {@hide} 742 */ 743 static final int SCROLLBARS_NONE = 0x00000000; 744 745 /** 746 * <p>This view shows horizontal scrollbars.</p> 747 * {@hide} 748 */ 749 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 750 751 /** 752 * <p>This view shows vertical scrollbars.</p> 753 * {@hide} 754 */ 755 static final int SCROLLBARS_VERTICAL = 0x00000200; 756 757 /** 758 * <p>Mask for use with setFlags indicating bits used for indicating which 759 * scrollbars are enabled.</p> 760 * {@hide} 761 */ 762 static final int SCROLLBARS_MASK = 0x00000300; 763 764 /** 765 * Indicates that the view should filter touches when its window is obscured. 766 * Refer to the class comments for more information about this security feature. 767 * {@hide} 768 */ 769 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 770 771 // note flag value 0x00000800 is now available for next flags... 772 773 /** 774 * <p>This view doesn't show fading edges.</p> 775 * {@hide} 776 */ 777 static final int FADING_EDGE_NONE = 0x00000000; 778 779 /** 780 * <p>This view shows horizontal fading edges.</p> 781 * {@hide} 782 */ 783 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 784 785 /** 786 * <p>This view shows vertical fading edges.</p> 787 * {@hide} 788 */ 789 static final int FADING_EDGE_VERTICAL = 0x00002000; 790 791 /** 792 * <p>Mask for use with setFlags indicating bits used for indicating which 793 * fading edges are enabled.</p> 794 * {@hide} 795 */ 796 static final int FADING_EDGE_MASK = 0x00003000; 797 798 /** 799 * <p>Indicates this view can be clicked. When clickable, a View reacts 800 * to clicks by notifying the OnClickListener.<p> 801 * {@hide} 802 */ 803 static final int CLICKABLE = 0x00004000; 804 805 /** 806 * <p>Indicates this view is caching its drawing into a bitmap.</p> 807 * {@hide} 808 */ 809 static final int DRAWING_CACHE_ENABLED = 0x00008000; 810 811 /** 812 * <p>Indicates that no icicle should be saved for this view.<p> 813 * {@hide} 814 */ 815 static final int SAVE_DISABLED = 0x000010000; 816 817 /** 818 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 819 * property.</p> 820 * {@hide} 821 */ 822 static final int SAVE_DISABLED_MASK = 0x000010000; 823 824 /** 825 * <p>Indicates that no drawing cache should ever be created for this view.<p> 826 * {@hide} 827 */ 828 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 829 830 /** 831 * <p>Indicates this view can take / keep focus when int touch mode.</p> 832 * {@hide} 833 */ 834 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 835 836 /** 837 * <p>Enables low quality mode for the drawing cache.</p> 838 */ 839 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 840 841 /** 842 * <p>Enables high quality mode for the drawing cache.</p> 843 */ 844 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 845 846 /** 847 * <p>Enables automatic quality mode for the drawing cache.</p> 848 */ 849 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 850 851 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 852 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 853 }; 854 855 /** 856 * <p>Mask for use with setFlags indicating bits used for the cache 857 * quality property.</p> 858 * {@hide} 859 */ 860 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 861 862 /** 863 * <p> 864 * Indicates this view can be long clicked. When long clickable, a View 865 * reacts to long clicks by notifying the OnLongClickListener or showing a 866 * context menu. 867 * </p> 868 * {@hide} 869 */ 870 static final int LONG_CLICKABLE = 0x00200000; 871 872 /** 873 * <p>Indicates that this view gets its drawable states from its direct parent 874 * and ignores its original internal states.</p> 875 * 876 * @hide 877 */ 878 static final int DUPLICATE_PARENT_STATE = 0x00400000; 879 880 /** 881 * The scrollbar style to display the scrollbars inside the content area, 882 * without increasing the padding. The scrollbars will be overlaid with 883 * translucency on the view's content. 884 */ 885 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 886 887 /** 888 * The scrollbar style to display the scrollbars inside the padded area, 889 * increasing the padding of the view. The scrollbars will not overlap the 890 * content area of the view. 891 */ 892 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 893 894 /** 895 * The scrollbar style to display the scrollbars at the edge of the view, 896 * without increasing the padding. The scrollbars will be overlaid with 897 * translucency. 898 */ 899 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 900 901 /** 902 * The scrollbar style to display the scrollbars at the edge of the view, 903 * increasing the padding of the view. The scrollbars will only overlap the 904 * background, if any. 905 */ 906 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 907 908 /** 909 * Mask to check if the scrollbar style is overlay or inset. 910 * {@hide} 911 */ 912 static final int SCROLLBARS_INSET_MASK = 0x01000000; 913 914 /** 915 * Mask to check if the scrollbar style is inside or outside. 916 * {@hide} 917 */ 918 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 919 920 /** 921 * Mask for scrollbar style. 922 * {@hide} 923 */ 924 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 925 926 /** 927 * View flag indicating that the screen should remain on while the 928 * window containing this view is visible to the user. This effectively 929 * takes care of automatically setting the WindowManager's 930 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 931 */ 932 public static final int KEEP_SCREEN_ON = 0x04000000; 933 934 /** 935 * View flag indicating whether this view should have sound effects enabled 936 * for events such as clicking and touching. 937 */ 938 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 939 940 /** 941 * View flag indicating whether this view should have haptic feedback 942 * enabled for events such as long presses. 943 */ 944 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 945 946 /** 947 * <p>Indicates that the view hierarchy should stop saving state when 948 * it reaches this view. If state saving is initiated immediately at 949 * the view, it will be allowed. 950 * {@hide} 951 */ 952 static final int PARENT_SAVE_DISABLED = 0x20000000; 953 954 /** 955 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 956 * {@hide} 957 */ 958 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 959 960 /** 961 * Horizontal direction of this view is from Left to Right. 962 * Use with {@link #setLayoutDirection}. 963 * {@hide} 964 */ 965 public static final int LAYOUT_DIRECTION_LTR = 0x00000000; 966 967 /** 968 * Horizontal direction of this view is from Right to Left. 969 * Use with {@link #setLayoutDirection}. 970 * {@hide} 971 */ 972 public static final int LAYOUT_DIRECTION_RTL = 0x40000000; 973 974 /** 975 * Horizontal direction of this view is inherited from its parent. 976 * Use with {@link #setLayoutDirection}. 977 * {@hide} 978 */ 979 public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000; 980 981 /** 982 * Horizontal direction of this view is from deduced from the default language 983 * script for the locale. Use with {@link #setLayoutDirection}. 984 * {@hide} 985 */ 986 public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000; 987 988 /** 989 * Mask for use with setFlags indicating bits used for horizontalDirection. 990 * {@hide} 991 */ 992 static final int LAYOUT_DIRECTION_MASK = 0xC0000000; 993 994 /* 995 * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct 996 * flag value. 997 * {@hide} 998 */ 999 private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR, 1000 LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE}; 1001 1002 /** 1003 * Default horizontalDirection. 1004 * {@hide} 1005 */ 1006 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1007 1008 /** 1009 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1010 * should add all focusable Views regardless if they are focusable in touch mode. 1011 */ 1012 public static final int FOCUSABLES_ALL = 0x00000000; 1013 1014 /** 1015 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1016 * should add only Views focusable in touch mode. 1017 */ 1018 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1019 1020 /** 1021 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1022 * item. 1023 */ 1024 public static final int FOCUS_BACKWARD = 0x00000001; 1025 1026 /** 1027 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1028 * item. 1029 */ 1030 public static final int FOCUS_FORWARD = 0x00000002; 1031 1032 /** 1033 * Use with {@link #focusSearch(int)}. Move focus to the left. 1034 */ 1035 public static final int FOCUS_LEFT = 0x00000011; 1036 1037 /** 1038 * Use with {@link #focusSearch(int)}. Move focus up. 1039 */ 1040 public static final int FOCUS_UP = 0x00000021; 1041 1042 /** 1043 * Use with {@link #focusSearch(int)}. Move focus to the right. 1044 */ 1045 public static final int FOCUS_RIGHT = 0x00000042; 1046 1047 /** 1048 * Use with {@link #focusSearch(int)}. Move focus down. 1049 */ 1050 public static final int FOCUS_DOWN = 0x00000082; 1051 1052 /** 1053 * Bits of {@link #getMeasuredWidthAndState()} and 1054 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1055 */ 1056 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1057 1058 /** 1059 * Bits of {@link #getMeasuredWidthAndState()} and 1060 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1061 */ 1062 public static final int MEASURED_STATE_MASK = 0xff000000; 1063 1064 /** 1065 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1066 * for functions that combine both width and height into a single int, 1067 * such as {@link #getMeasuredState()} and the childState argument of 1068 * {@link #resolveSizeAndState(int, int, int)}. 1069 */ 1070 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1071 1072 /** 1073 * Bit of {@link #getMeasuredWidthAndState()} and 1074 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1075 * is smaller that the space the view would like to have. 1076 */ 1077 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1078 1079 /** 1080 * Base View state sets 1081 */ 1082 // Singles 1083 /** 1084 * Indicates the view has no states set. States are used with 1085 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1086 * view depending on its state. 1087 * 1088 * @see android.graphics.drawable.Drawable 1089 * @see #getDrawableState() 1090 */ 1091 protected static final int[] EMPTY_STATE_SET; 1092 /** 1093 * Indicates the view is enabled. States are used with 1094 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1095 * view depending on its state. 1096 * 1097 * @see android.graphics.drawable.Drawable 1098 * @see #getDrawableState() 1099 */ 1100 protected static final int[] ENABLED_STATE_SET; 1101 /** 1102 * Indicates the view is focused. States are used with 1103 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1104 * view depending on its state. 1105 * 1106 * @see android.graphics.drawable.Drawable 1107 * @see #getDrawableState() 1108 */ 1109 protected static final int[] FOCUSED_STATE_SET; 1110 /** 1111 * Indicates the view is selected. States are used with 1112 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1113 * view depending on its state. 1114 * 1115 * @see android.graphics.drawable.Drawable 1116 * @see #getDrawableState() 1117 */ 1118 protected static final int[] SELECTED_STATE_SET; 1119 /** 1120 * Indicates the view is pressed. States are used with 1121 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1122 * view depending on its state. 1123 * 1124 * @see android.graphics.drawable.Drawable 1125 * @see #getDrawableState() 1126 * @hide 1127 */ 1128 protected static final int[] PRESSED_STATE_SET; 1129 /** 1130 * Indicates the view's window has focus. States are used with 1131 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1132 * view depending on its state. 1133 * 1134 * @see android.graphics.drawable.Drawable 1135 * @see #getDrawableState() 1136 */ 1137 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1138 // Doubles 1139 /** 1140 * Indicates the view is enabled and has the focus. 1141 * 1142 * @see #ENABLED_STATE_SET 1143 * @see #FOCUSED_STATE_SET 1144 */ 1145 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1146 /** 1147 * Indicates the view is enabled and selected. 1148 * 1149 * @see #ENABLED_STATE_SET 1150 * @see #SELECTED_STATE_SET 1151 */ 1152 protected static final int[] ENABLED_SELECTED_STATE_SET; 1153 /** 1154 * Indicates the view is enabled and that its window has focus. 1155 * 1156 * @see #ENABLED_STATE_SET 1157 * @see #WINDOW_FOCUSED_STATE_SET 1158 */ 1159 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1160 /** 1161 * Indicates the view is focused and selected. 1162 * 1163 * @see #FOCUSED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 */ 1166 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1167 /** 1168 * Indicates the view has the focus and that its window has the focus. 1169 * 1170 * @see #FOCUSED_STATE_SET 1171 * @see #WINDOW_FOCUSED_STATE_SET 1172 */ 1173 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1174 /** 1175 * Indicates the view is selected and that its window has the focus. 1176 * 1177 * @see #SELECTED_STATE_SET 1178 * @see #WINDOW_FOCUSED_STATE_SET 1179 */ 1180 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1181 // Triples 1182 /** 1183 * Indicates the view is enabled, focused and selected. 1184 * 1185 * @see #ENABLED_STATE_SET 1186 * @see #FOCUSED_STATE_SET 1187 * @see #SELECTED_STATE_SET 1188 */ 1189 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1190 /** 1191 * Indicates the view is enabled, focused and its window has the focus. 1192 * 1193 * @see #ENABLED_STATE_SET 1194 * @see #FOCUSED_STATE_SET 1195 * @see #WINDOW_FOCUSED_STATE_SET 1196 */ 1197 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1198 /** 1199 * Indicates the view is enabled, selected and its window has the focus. 1200 * 1201 * @see #ENABLED_STATE_SET 1202 * @see #SELECTED_STATE_SET 1203 * @see #WINDOW_FOCUSED_STATE_SET 1204 */ 1205 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1206 /** 1207 * Indicates the view is focused, selected and its window has the focus. 1208 * 1209 * @see #FOCUSED_STATE_SET 1210 * @see #SELECTED_STATE_SET 1211 * @see #WINDOW_FOCUSED_STATE_SET 1212 */ 1213 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1214 /** 1215 * Indicates the view is enabled, focused, selected and its window 1216 * has the focus. 1217 * 1218 * @see #ENABLED_STATE_SET 1219 * @see #FOCUSED_STATE_SET 1220 * @see #SELECTED_STATE_SET 1221 * @see #WINDOW_FOCUSED_STATE_SET 1222 */ 1223 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1224 /** 1225 * Indicates the view is pressed and its window has the focus. 1226 * 1227 * @see #PRESSED_STATE_SET 1228 * @see #WINDOW_FOCUSED_STATE_SET 1229 */ 1230 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1231 /** 1232 * Indicates the view is pressed and selected. 1233 * 1234 * @see #PRESSED_STATE_SET 1235 * @see #SELECTED_STATE_SET 1236 */ 1237 protected static final int[] PRESSED_SELECTED_STATE_SET; 1238 /** 1239 * Indicates the view is pressed, selected and its window has the focus. 1240 * 1241 * @see #PRESSED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 * @see #WINDOW_FOCUSED_STATE_SET 1244 */ 1245 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1246 /** 1247 * Indicates the view is pressed and focused. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #FOCUSED_STATE_SET 1251 */ 1252 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1253 /** 1254 * Indicates the view is pressed, focused and its window has the focus. 1255 * 1256 * @see #PRESSED_STATE_SET 1257 * @see #FOCUSED_STATE_SET 1258 * @see #WINDOW_FOCUSED_STATE_SET 1259 */ 1260 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1261 /** 1262 * Indicates the view is pressed, focused and selected. 1263 * 1264 * @see #PRESSED_STATE_SET 1265 * @see #SELECTED_STATE_SET 1266 * @see #FOCUSED_STATE_SET 1267 */ 1268 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1269 /** 1270 * Indicates the view is pressed, focused, selected and its window has the focus. 1271 * 1272 * @see #PRESSED_STATE_SET 1273 * @see #FOCUSED_STATE_SET 1274 * @see #SELECTED_STATE_SET 1275 * @see #WINDOW_FOCUSED_STATE_SET 1276 */ 1277 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1278 /** 1279 * Indicates the view is pressed and enabled. 1280 * 1281 * @see #PRESSED_STATE_SET 1282 * @see #ENABLED_STATE_SET 1283 */ 1284 protected static final int[] PRESSED_ENABLED_STATE_SET; 1285 /** 1286 * Indicates the view is pressed, enabled and its window has the focus. 1287 * 1288 * @see #PRESSED_STATE_SET 1289 * @see #ENABLED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1293 /** 1294 * Indicates the view is pressed, enabled and selected. 1295 * 1296 * @see #PRESSED_STATE_SET 1297 * @see #ENABLED_STATE_SET 1298 * @see #SELECTED_STATE_SET 1299 */ 1300 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1301 /** 1302 * Indicates the view is pressed, enabled, selected and its window has the 1303 * focus. 1304 * 1305 * @see #PRESSED_STATE_SET 1306 * @see #ENABLED_STATE_SET 1307 * @see #SELECTED_STATE_SET 1308 * @see #WINDOW_FOCUSED_STATE_SET 1309 */ 1310 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1311 /** 1312 * Indicates the view is pressed, enabled and focused. 1313 * 1314 * @see #PRESSED_STATE_SET 1315 * @see #ENABLED_STATE_SET 1316 * @see #FOCUSED_STATE_SET 1317 */ 1318 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1319 /** 1320 * Indicates the view is pressed, enabled, focused and its window has the 1321 * focus. 1322 * 1323 * @see #PRESSED_STATE_SET 1324 * @see #ENABLED_STATE_SET 1325 * @see #FOCUSED_STATE_SET 1326 * @see #WINDOW_FOCUSED_STATE_SET 1327 */ 1328 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1329 /** 1330 * Indicates the view is pressed, enabled, focused and selected. 1331 * 1332 * @see #PRESSED_STATE_SET 1333 * @see #ENABLED_STATE_SET 1334 * @see #SELECTED_STATE_SET 1335 * @see #FOCUSED_STATE_SET 1336 */ 1337 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1338 /** 1339 * Indicates the view is pressed, enabled, focused, selected and its window 1340 * has the focus. 1341 * 1342 * @see #PRESSED_STATE_SET 1343 * @see #ENABLED_STATE_SET 1344 * @see #SELECTED_STATE_SET 1345 * @see #FOCUSED_STATE_SET 1346 * @see #WINDOW_FOCUSED_STATE_SET 1347 */ 1348 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1349 1350 /** 1351 * The order here is very important to {@link #getDrawableState()} 1352 */ 1353 private static final int[][] VIEW_STATE_SETS; 1354 1355 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1356 static final int VIEW_STATE_SELECTED = 1 << 1; 1357 static final int VIEW_STATE_FOCUSED = 1 << 2; 1358 static final int VIEW_STATE_ENABLED = 1 << 3; 1359 static final int VIEW_STATE_PRESSED = 1 << 4; 1360 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1361 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1362 static final int VIEW_STATE_HOVERED = 1 << 7; 1363 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1364 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1365 1366 static final int[] VIEW_STATE_IDS = new int[] { 1367 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1368 R.attr.state_selected, VIEW_STATE_SELECTED, 1369 R.attr.state_focused, VIEW_STATE_FOCUSED, 1370 R.attr.state_enabled, VIEW_STATE_ENABLED, 1371 R.attr.state_pressed, VIEW_STATE_PRESSED, 1372 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1373 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1374 R.attr.state_hovered, VIEW_STATE_HOVERED, 1375 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1376 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1377 }; 1378 1379 static { 1380 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1381 throw new IllegalStateException( 1382 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1383 } 1384 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1385 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1386 int viewState = R.styleable.ViewDrawableStates[i]; 1387 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1388 if (VIEW_STATE_IDS[j] == viewState) { 1389 orderedIds[i * 2] = viewState; 1390 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1391 } 1392 } 1393 } 1394 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1395 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1396 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1397 int numBits = Integer.bitCount(i); 1398 int[] set = new int[numBits]; 1399 int pos = 0; 1400 for (int j = 0; j < orderedIds.length; j += 2) { 1401 if ((i & orderedIds[j+1]) != 0) { 1402 set[pos++] = orderedIds[j]; 1403 } 1404 } 1405 VIEW_STATE_SETS[i] = set; 1406 } 1407 1408 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1409 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1410 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1411 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1412 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1413 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1414 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1415 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1416 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1418 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_FOCUSED]; 1421 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1422 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1423 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1424 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1425 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1426 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1427 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1428 | VIEW_STATE_ENABLED]; 1429 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1430 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1431 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1432 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1433 | VIEW_STATE_ENABLED]; 1434 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1435 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1436 | VIEW_STATE_ENABLED]; 1437 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1438 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1439 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1440 1441 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1442 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1444 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1445 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1446 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1448 | VIEW_STATE_PRESSED]; 1449 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1451 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1453 | VIEW_STATE_PRESSED]; 1454 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1456 | VIEW_STATE_PRESSED]; 1457 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1459 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1460 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1462 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1464 | VIEW_STATE_PRESSED]; 1465 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1467 | VIEW_STATE_PRESSED]; 1468 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1470 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1471 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1472 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1473 | VIEW_STATE_PRESSED]; 1474 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1476 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1477 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1479 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1480 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1482 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1483 | VIEW_STATE_PRESSED]; 1484 } 1485 1486 /** 1487 * Temporary Rect currently for use in setBackground(). This will probably 1488 * be extended in the future to hold our own class with more than just 1489 * a Rect. :) 1490 */ 1491 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1492 1493 /** 1494 * Map used to store views' tags. 1495 */ 1496 private static WeakHashMap<View, SparseArray<Object>> sTags; 1497 1498 /** 1499 * Lock used to access sTags. 1500 */ 1501 private static final Object sTagsLock = new Object(); 1502 1503 /** 1504 * The next available accessiiblity id. 1505 */ 1506 private static int sNextAccessibilityViewId; 1507 1508 /** 1509 * The animation currently associated with this view. 1510 * @hide 1511 */ 1512 protected Animation mCurrentAnimation = null; 1513 1514 /** 1515 * Width as measured during measure pass. 1516 * {@hide} 1517 */ 1518 @ViewDebug.ExportedProperty(category = "measurement") 1519 int mMeasuredWidth; 1520 1521 /** 1522 * Height as measured during measure pass. 1523 * {@hide} 1524 */ 1525 @ViewDebug.ExportedProperty(category = "measurement") 1526 int mMeasuredHeight; 1527 1528 /** 1529 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1530 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1531 * its display list. This flag, used only when hw accelerated, allows us to clear the 1532 * flag while retaining this information until it's needed (at getDisplayList() time and 1533 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1534 * 1535 * {@hide} 1536 */ 1537 boolean mRecreateDisplayList = false; 1538 1539 /** 1540 * The view's identifier. 1541 * {@hide} 1542 * 1543 * @see #setId(int) 1544 * @see #getId() 1545 */ 1546 @ViewDebug.ExportedProperty(resolveId = true) 1547 int mID = NO_ID; 1548 1549 /** 1550 * The stable ID of this view for accessibility porposes. 1551 */ 1552 int mAccessibilityViewId = NO_ID; 1553 1554 /** 1555 * The view's tag. 1556 * {@hide} 1557 * 1558 * @see #setTag(Object) 1559 * @see #getTag() 1560 */ 1561 protected Object mTag; 1562 1563 // for mPrivateFlags: 1564 /** {@hide} */ 1565 static final int WANTS_FOCUS = 0x00000001; 1566 /** {@hide} */ 1567 static final int FOCUSED = 0x00000002; 1568 /** {@hide} */ 1569 static final int SELECTED = 0x00000004; 1570 /** {@hide} */ 1571 static final int IS_ROOT_NAMESPACE = 0x00000008; 1572 /** {@hide} */ 1573 static final int HAS_BOUNDS = 0x00000010; 1574 /** {@hide} */ 1575 static final int DRAWN = 0x00000020; 1576 /** 1577 * When this flag is set, this view is running an animation on behalf of its 1578 * children and should therefore not cancel invalidate requests, even if they 1579 * lie outside of this view's bounds. 1580 * 1581 * {@hide} 1582 */ 1583 static final int DRAW_ANIMATION = 0x00000040; 1584 /** {@hide} */ 1585 static final int SKIP_DRAW = 0x00000080; 1586 /** {@hide} */ 1587 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1588 /** {@hide} */ 1589 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1590 /** {@hide} */ 1591 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1592 /** {@hide} */ 1593 static final int MEASURED_DIMENSION_SET = 0x00000800; 1594 /** {@hide} */ 1595 static final int FORCE_LAYOUT = 0x00001000; 1596 /** {@hide} */ 1597 static final int LAYOUT_REQUIRED = 0x00002000; 1598 1599 private static final int PRESSED = 0x00004000; 1600 1601 /** {@hide} */ 1602 static final int DRAWING_CACHE_VALID = 0x00008000; 1603 /** 1604 * Flag used to indicate that this view should be drawn once more (and only once 1605 * more) after its animation has completed. 1606 * {@hide} 1607 */ 1608 static final int ANIMATION_STARTED = 0x00010000; 1609 1610 private static final int SAVE_STATE_CALLED = 0x00020000; 1611 1612 /** 1613 * Indicates that the View returned true when onSetAlpha() was called and that 1614 * the alpha must be restored. 1615 * {@hide} 1616 */ 1617 static final int ALPHA_SET = 0x00040000; 1618 1619 /** 1620 * Set by {@link #setScrollContainer(boolean)}. 1621 */ 1622 static final int SCROLL_CONTAINER = 0x00080000; 1623 1624 /** 1625 * Set by {@link #setScrollContainer(boolean)}. 1626 */ 1627 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1628 1629 /** 1630 * View flag indicating whether this view was invalidated (fully or partially.) 1631 * 1632 * @hide 1633 */ 1634 static final int DIRTY = 0x00200000; 1635 1636 /** 1637 * View flag indicating whether this view was invalidated by an opaque 1638 * invalidate request. 1639 * 1640 * @hide 1641 */ 1642 static final int DIRTY_OPAQUE = 0x00400000; 1643 1644 /** 1645 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1646 * 1647 * @hide 1648 */ 1649 static final int DIRTY_MASK = 0x00600000; 1650 1651 /** 1652 * Indicates whether the background is opaque. 1653 * 1654 * @hide 1655 */ 1656 static final int OPAQUE_BACKGROUND = 0x00800000; 1657 1658 /** 1659 * Indicates whether the scrollbars are opaque. 1660 * 1661 * @hide 1662 */ 1663 static final int OPAQUE_SCROLLBARS = 0x01000000; 1664 1665 /** 1666 * Indicates whether the view is opaque. 1667 * 1668 * @hide 1669 */ 1670 static final int OPAQUE_MASK = 0x01800000; 1671 1672 /** 1673 * Indicates a prepressed state; 1674 * the short time between ACTION_DOWN and recognizing 1675 * a 'real' press. Prepressed is used to recognize quick taps 1676 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1677 * 1678 * @hide 1679 */ 1680 private static final int PREPRESSED = 0x02000000; 1681 1682 /** 1683 * Indicates whether the view is temporarily detached. 1684 * 1685 * @hide 1686 */ 1687 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1688 1689 /** 1690 * Indicates that we should awaken scroll bars once attached 1691 * 1692 * @hide 1693 */ 1694 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1695 1696 /** 1697 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1698 * @hide 1699 */ 1700 private static final int HOVERED = 0x10000000; 1701 1702 /** 1703 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1704 * for transform operations 1705 * 1706 * @hide 1707 */ 1708 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1709 1710 /** {@hide} */ 1711 static final int ACTIVATED = 0x40000000; 1712 1713 /** 1714 * Indicates that this view was specifically invalidated, not just dirtied because some 1715 * child view was invalidated. The flag is used to determine when we need to recreate 1716 * a view's display list (as opposed to just returning a reference to its existing 1717 * display list). 1718 * 1719 * @hide 1720 */ 1721 static final int INVALIDATED = 0x80000000; 1722 1723 /* Masks for mPrivateFlags2 */ 1724 1725 /** 1726 * Indicates that this view has reported that it can accept the current drag's content. 1727 * Cleared when the drag operation concludes. 1728 * @hide 1729 */ 1730 static final int DRAG_CAN_ACCEPT = 0x00000001; 1731 1732 /** 1733 * Indicates that this view is currently directly under the drag location in a 1734 * drag-and-drop operation involving content that it can accept. Cleared when 1735 * the drag exits the view, or when the drag operation concludes. 1736 * @hide 1737 */ 1738 static final int DRAG_HOVERED = 0x00000002; 1739 1740 /** 1741 * Indicates whether the view layout direction has been resolved and drawn to the 1742 * right-to-left direction. 1743 * 1744 * @hide 1745 */ 1746 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 0x00000004; 1747 1748 /** 1749 * Indicates whether the view layout direction has been resolved. 1750 * 1751 * @hide 1752 */ 1753 static final int LAYOUT_DIRECTION_RESOLVED = 0x00000008; 1754 1755 1756 /* End of masks for mPrivateFlags2 */ 1757 1758 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1759 1760 /** 1761 * Always allow a user to over-scroll this view, provided it is a 1762 * view that can scroll. 1763 * 1764 * @see #getOverScrollMode() 1765 * @see #setOverScrollMode(int) 1766 */ 1767 public static final int OVER_SCROLL_ALWAYS = 0; 1768 1769 /** 1770 * Allow a user to over-scroll this view only if the content is large 1771 * enough to meaningfully scroll, provided it is a view that can scroll. 1772 * 1773 * @see #getOverScrollMode() 1774 * @see #setOverScrollMode(int) 1775 */ 1776 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1777 1778 /** 1779 * Never allow a user to over-scroll this view. 1780 * 1781 * @see #getOverScrollMode() 1782 * @see #setOverScrollMode(int) 1783 */ 1784 public static final int OVER_SCROLL_NEVER = 2; 1785 1786 /** 1787 * View has requested the system UI (status bar) to be visible (the default). 1788 * 1789 * @see #setSystemUiVisibility(int) 1790 */ 1791 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 1792 1793 /** 1794 * View has requested the system UI to enter an unobtrusive "low profile" mode. 1795 * 1796 * This is for use in games, book readers, video players, or any other "immersive" application 1797 * where the usual system chrome is deemed too distracting. 1798 * 1799 * In low profile mode, the status bar and/or navigation icons may dim. 1800 * 1801 * @see #setSystemUiVisibility(int) 1802 */ 1803 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 1804 1805 /** 1806 * View has requested that the system navigation be temporarily hidden. 1807 * 1808 * This is an even less obtrusive state than that called for by 1809 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 1810 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 1811 * those to disappear. This is useful (in conjunction with the 1812 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 1813 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 1814 * window flags) for displaying content using every last pixel on the display. 1815 * 1816 * There is a limitation: because navigation controls are so important, the least user 1817 * interaction will cause them to reappear immediately. 1818 * 1819 * @see #setSystemUiVisibility(int) 1820 */ 1821 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 1822 1823 /** 1824 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 1825 */ 1826 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 1827 1828 /** 1829 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 1830 */ 1831 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 1832 1833 /** 1834 * @hide 1835 * 1836 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1837 * out of the public fields to keep the undefined bits out of the developer's way. 1838 * 1839 * Flag to make the status bar not expandable. Unless you also 1840 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1841 */ 1842 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1843 1844 /** 1845 * @hide 1846 * 1847 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1848 * out of the public fields to keep the undefined bits out of the developer's way. 1849 * 1850 * Flag to hide notification icons and scrolling ticker text. 1851 */ 1852 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1853 1854 /** 1855 * @hide 1856 * 1857 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1858 * out of the public fields to keep the undefined bits out of the developer's way. 1859 * 1860 * Flag to disable incoming notification alerts. This will not block 1861 * icons, but it will block sound, vibrating and other visual or aural notifications. 1862 */ 1863 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1864 1865 /** 1866 * @hide 1867 * 1868 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1869 * out of the public fields to keep the undefined bits out of the developer's way. 1870 * 1871 * Flag to hide only the scrolling ticker. Note that 1872 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1873 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1874 */ 1875 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1876 1877 /** 1878 * @hide 1879 * 1880 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1881 * out of the public fields to keep the undefined bits out of the developer's way. 1882 * 1883 * Flag to hide the center system info area. 1884 */ 1885 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1886 1887 /** 1888 * @hide 1889 * 1890 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1891 * out of the public fields to keep the undefined bits out of the developer's way. 1892 * 1893 * Flag to hide only the navigation buttons. Don't use this 1894 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1895 * 1896 * THIS DOES NOT DISABLE THE BACK BUTTON 1897 */ 1898 public static final int STATUS_BAR_DISABLE_NAVIGATION = 0x00200000; 1899 1900 /** 1901 * @hide 1902 * 1903 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1904 * out of the public fields to keep the undefined bits out of the developer's way. 1905 * 1906 * Flag to hide only the back button. Don't use this 1907 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1908 */ 1909 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1910 1911 /** 1912 * @hide 1913 * 1914 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1915 * out of the public fields to keep the undefined bits out of the developer's way. 1916 * 1917 * Flag to hide only the clock. You might use this if your activity has 1918 * its own clock making the status bar's clock redundant. 1919 */ 1920 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1921 1922 /** 1923 * @hide 1924 */ 1925 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 1926 1927 /** 1928 * Controls the over-scroll mode for this view. 1929 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1930 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1931 * and {@link #OVER_SCROLL_NEVER}. 1932 */ 1933 private int mOverScrollMode; 1934 1935 /** 1936 * The parent this view is attached to. 1937 * {@hide} 1938 * 1939 * @see #getParent() 1940 */ 1941 protected ViewParent mParent; 1942 1943 /** 1944 * {@hide} 1945 */ 1946 AttachInfo mAttachInfo; 1947 1948 /** 1949 * {@hide} 1950 */ 1951 @ViewDebug.ExportedProperty(flagMapping = { 1952 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1953 name = "FORCE_LAYOUT"), 1954 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1955 name = "LAYOUT_REQUIRED"), 1956 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1957 name = "DRAWING_CACHE_INVALID", outputIf = false), 1958 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1959 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1960 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1961 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1962 }) 1963 int mPrivateFlags; 1964 int mPrivateFlags2; 1965 1966 /** 1967 * This view's request for the visibility of the status bar. 1968 * @hide 1969 */ 1970 @ViewDebug.ExportedProperty(flagMapping = { 1971 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 1972 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 1973 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 1974 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 1975 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 1976 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 1977 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 1978 equals = SYSTEM_UI_FLAG_VISIBLE, 1979 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 1980 }) 1981 int mSystemUiVisibility; 1982 1983 /** 1984 * Count of how many windows this view has been attached to. 1985 */ 1986 int mWindowAttachCount; 1987 1988 /** 1989 * The layout parameters associated with this view and used by the parent 1990 * {@link android.view.ViewGroup} to determine how this view should be 1991 * laid out. 1992 * {@hide} 1993 */ 1994 protected ViewGroup.LayoutParams mLayoutParams; 1995 1996 /** 1997 * The view flags hold various views states. 1998 * {@hide} 1999 */ 2000 @ViewDebug.ExportedProperty 2001 int mViewFlags; 2002 2003 /** 2004 * The transform matrix for the View. This transform is calculated internally 2005 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2006 * is used by default. Do *not* use this variable directly; instead call 2007 * getMatrix(), which will automatically recalculate the matrix if necessary 2008 * to get the correct matrix based on the latest rotation and scale properties. 2009 */ 2010 private final Matrix mMatrix = new Matrix(); 2011 2012 /** 2013 * The transform matrix for the View. This transform is calculated internally 2014 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2015 * is used by default. Do *not* use this variable directly; instead call 2016 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2017 * to get the correct matrix based on the latest rotation and scale properties. 2018 */ 2019 private Matrix mInverseMatrix; 2020 2021 /** 2022 * An internal variable that tracks whether we need to recalculate the 2023 * transform matrix, based on whether the rotation or scaleX/Y properties 2024 * have changed since the matrix was last calculated. 2025 */ 2026 boolean mMatrixDirty = false; 2027 2028 /** 2029 * An internal variable that tracks whether we need to recalculate the 2030 * transform matrix, based on whether the rotation or scaleX/Y properties 2031 * have changed since the matrix was last calculated. 2032 */ 2033 private boolean mInverseMatrixDirty = true; 2034 2035 /** 2036 * A variable that tracks whether we need to recalculate the 2037 * transform matrix, based on whether the rotation or scaleX/Y properties 2038 * have changed since the matrix was last calculated. This variable 2039 * is only valid after a call to updateMatrix() or to a function that 2040 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2041 */ 2042 private boolean mMatrixIsIdentity = true; 2043 2044 /** 2045 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2046 */ 2047 private Camera mCamera = null; 2048 2049 /** 2050 * This matrix is used when computing the matrix for 3D rotations. 2051 */ 2052 private Matrix matrix3D = null; 2053 2054 /** 2055 * These prev values are used to recalculate a centered pivot point when necessary. The 2056 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2057 * set), so thes values are only used then as well. 2058 */ 2059 private int mPrevWidth = -1; 2060 private int mPrevHeight = -1; 2061 2062 private boolean mLastIsOpaque; 2063 2064 /** 2065 * Convenience value to check for float values that are close enough to zero to be considered 2066 * zero. 2067 */ 2068 private static final float NONZERO_EPSILON = .001f; 2069 2070 /** 2071 * The degrees rotation around the vertical axis through the pivot point. 2072 */ 2073 @ViewDebug.ExportedProperty 2074 float mRotationY = 0f; 2075 2076 /** 2077 * The degrees rotation around the horizontal axis through the pivot point. 2078 */ 2079 @ViewDebug.ExportedProperty 2080 float mRotationX = 0f; 2081 2082 /** 2083 * The degrees rotation around the pivot point. 2084 */ 2085 @ViewDebug.ExportedProperty 2086 float mRotation = 0f; 2087 2088 /** 2089 * The amount of translation of the object away from its left property (post-layout). 2090 */ 2091 @ViewDebug.ExportedProperty 2092 float mTranslationX = 0f; 2093 2094 /** 2095 * The amount of translation of the object away from its top property (post-layout). 2096 */ 2097 @ViewDebug.ExportedProperty 2098 float mTranslationY = 0f; 2099 2100 /** 2101 * The amount of scale in the x direction around the pivot point. A 2102 * value of 1 means no scaling is applied. 2103 */ 2104 @ViewDebug.ExportedProperty 2105 float mScaleX = 1f; 2106 2107 /** 2108 * The amount of scale in the y direction around the pivot point. A 2109 * value of 1 means no scaling is applied. 2110 */ 2111 @ViewDebug.ExportedProperty 2112 float mScaleY = 1f; 2113 2114 /** 2115 * The amount of scale in the x direction around the pivot point. A 2116 * value of 1 means no scaling is applied. 2117 */ 2118 @ViewDebug.ExportedProperty 2119 float mPivotX = 0f; 2120 2121 /** 2122 * The amount of scale in the y direction around the pivot point. A 2123 * value of 1 means no scaling is applied. 2124 */ 2125 @ViewDebug.ExportedProperty 2126 float mPivotY = 0f; 2127 2128 /** 2129 * The opacity of the View. This is a value from 0 to 1, where 0 means 2130 * completely transparent and 1 means completely opaque. 2131 */ 2132 @ViewDebug.ExportedProperty 2133 float mAlpha = 1f; 2134 2135 /** 2136 * The distance in pixels from the left edge of this view's parent 2137 * to the left edge of this view. 2138 * {@hide} 2139 */ 2140 @ViewDebug.ExportedProperty(category = "layout") 2141 protected int mLeft; 2142 /** 2143 * The distance in pixels from the left edge of this view's parent 2144 * to the right edge of this view. 2145 * {@hide} 2146 */ 2147 @ViewDebug.ExportedProperty(category = "layout") 2148 protected int mRight; 2149 /** 2150 * The distance in pixels from the top edge of this view's parent 2151 * to the top edge of this view. 2152 * {@hide} 2153 */ 2154 @ViewDebug.ExportedProperty(category = "layout") 2155 protected int mTop; 2156 /** 2157 * The distance in pixels from the top edge of this view's parent 2158 * to the bottom edge of this view. 2159 * {@hide} 2160 */ 2161 @ViewDebug.ExportedProperty(category = "layout") 2162 protected int mBottom; 2163 2164 /** 2165 * The offset, in pixels, by which the content of this view is scrolled 2166 * horizontally. 2167 * {@hide} 2168 */ 2169 @ViewDebug.ExportedProperty(category = "scrolling") 2170 protected int mScrollX; 2171 /** 2172 * The offset, in pixels, by which the content of this view is scrolled 2173 * vertically. 2174 * {@hide} 2175 */ 2176 @ViewDebug.ExportedProperty(category = "scrolling") 2177 protected int mScrollY; 2178 2179 /** 2180 * The left padding in pixels, that is the distance in pixels between the 2181 * left edge of this view and the left edge of its content. 2182 * {@hide} 2183 */ 2184 @ViewDebug.ExportedProperty(category = "padding") 2185 protected int mPaddingLeft; 2186 /** 2187 * The right padding in pixels, that is the distance in pixels between the 2188 * right edge of this view and the right edge of its content. 2189 * {@hide} 2190 */ 2191 @ViewDebug.ExportedProperty(category = "padding") 2192 protected int mPaddingRight; 2193 /** 2194 * The top padding in pixels, that is the distance in pixels between the 2195 * top edge of this view and the top edge of its content. 2196 * {@hide} 2197 */ 2198 @ViewDebug.ExportedProperty(category = "padding") 2199 protected int mPaddingTop; 2200 /** 2201 * The bottom padding in pixels, that is the distance in pixels between the 2202 * bottom edge of this view and the bottom edge of its content. 2203 * {@hide} 2204 */ 2205 @ViewDebug.ExportedProperty(category = "padding") 2206 protected int mPaddingBottom; 2207 2208 /** 2209 * Briefly describes the view and is primarily used for accessibility support. 2210 */ 2211 private CharSequence mContentDescription; 2212 2213 /** 2214 * Cache the paddingRight set by the user to append to the scrollbar's size. 2215 * 2216 * @hide 2217 */ 2218 @ViewDebug.ExportedProperty(category = "padding") 2219 protected int mUserPaddingRight; 2220 2221 /** 2222 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2223 * 2224 * @hide 2225 */ 2226 @ViewDebug.ExportedProperty(category = "padding") 2227 protected int mUserPaddingBottom; 2228 2229 /** 2230 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2231 * 2232 * @hide 2233 */ 2234 @ViewDebug.ExportedProperty(category = "padding") 2235 protected int mUserPaddingLeft; 2236 2237 /** 2238 * Cache if the user padding is relative. 2239 * 2240 */ 2241 @ViewDebug.ExportedProperty(category = "padding") 2242 boolean mUserPaddingRelative; 2243 2244 /** 2245 * Cache the paddingStart set by the user to append to the scrollbar's size. 2246 * 2247 */ 2248 @ViewDebug.ExportedProperty(category = "padding") 2249 int mUserPaddingStart; 2250 2251 /** 2252 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2253 * 2254 */ 2255 @ViewDebug.ExportedProperty(category = "padding") 2256 int mUserPaddingEnd; 2257 2258 /** 2259 * @hide 2260 */ 2261 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2262 /** 2263 * @hide 2264 */ 2265 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2266 2267 private Resources mResources = null; 2268 2269 private Drawable mBGDrawable; 2270 2271 private int mBackgroundResource; 2272 private boolean mBackgroundSizeChanged; 2273 2274 /** 2275 * Listener used to dispatch focus change events. 2276 * This field should be made private, so it is hidden from the SDK. 2277 * {@hide} 2278 */ 2279 protected OnFocusChangeListener mOnFocusChangeListener; 2280 2281 /** 2282 * Listeners for layout change events. 2283 */ 2284 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2285 2286 /** 2287 * Listeners for attach events. 2288 */ 2289 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2290 2291 /** 2292 * Listener used to dispatch click events. 2293 * This field should be made private, so it is hidden from the SDK. 2294 * {@hide} 2295 */ 2296 protected OnClickListener mOnClickListener; 2297 2298 /** 2299 * Listener used to dispatch long click events. 2300 * This field should be made private, so it is hidden from the SDK. 2301 * {@hide} 2302 */ 2303 protected OnLongClickListener mOnLongClickListener; 2304 2305 /** 2306 * Listener used to build the context menu. 2307 * This field should be made private, so it is hidden from the SDK. 2308 * {@hide} 2309 */ 2310 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2311 2312 private OnKeyListener mOnKeyListener; 2313 2314 private OnTouchListener mOnTouchListener; 2315 2316 private OnHoverListener mOnHoverListener; 2317 2318 private OnGenericMotionListener mOnGenericMotionListener; 2319 2320 private OnDragListener mOnDragListener; 2321 2322 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2323 2324 /** 2325 * The application environment this view lives in. 2326 * This field should be made private, so it is hidden from the SDK. 2327 * {@hide} 2328 */ 2329 protected Context mContext; 2330 2331 private ScrollabilityCache mScrollCache; 2332 2333 private int[] mDrawableState = null; 2334 2335 /** 2336 * Set to true when drawing cache is enabled and cannot be created. 2337 * 2338 * @hide 2339 */ 2340 public boolean mCachingFailed; 2341 2342 private Bitmap mDrawingCache; 2343 private Bitmap mUnscaledDrawingCache; 2344 private HardwareLayer mHardwareLayer; 2345 DisplayList mDisplayList; 2346 2347 /** 2348 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2349 * the user may specify which view to go to next. 2350 */ 2351 private int mNextFocusLeftId = View.NO_ID; 2352 2353 /** 2354 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2355 * the user may specify which view to go to next. 2356 */ 2357 private int mNextFocusRightId = View.NO_ID; 2358 2359 /** 2360 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2361 * the user may specify which view to go to next. 2362 */ 2363 private int mNextFocusUpId = View.NO_ID; 2364 2365 /** 2366 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2367 * the user may specify which view to go to next. 2368 */ 2369 private int mNextFocusDownId = View.NO_ID; 2370 2371 /** 2372 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2373 * the user may specify which view to go to next. 2374 */ 2375 int mNextFocusForwardId = View.NO_ID; 2376 2377 private CheckForLongPress mPendingCheckForLongPress; 2378 private CheckForTap mPendingCheckForTap = null; 2379 private PerformClick mPerformClick; 2380 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2381 2382 private UnsetPressedState mUnsetPressedState; 2383 2384 /** 2385 * Whether the long press's action has been invoked. The tap's action is invoked on the 2386 * up event while a long press is invoked as soon as the long press duration is reached, so 2387 * a long press could be performed before the tap is checked, in which case the tap's action 2388 * should not be invoked. 2389 */ 2390 private boolean mHasPerformedLongPress; 2391 2392 /** 2393 * The minimum height of the view. We'll try our best to have the height 2394 * of this view to at least this amount. 2395 */ 2396 @ViewDebug.ExportedProperty(category = "measurement") 2397 private int mMinHeight; 2398 2399 /** 2400 * The minimum width of the view. We'll try our best to have the width 2401 * of this view to at least this amount. 2402 */ 2403 @ViewDebug.ExportedProperty(category = "measurement") 2404 private int mMinWidth; 2405 2406 /** 2407 * The delegate to handle touch events that are physically in this view 2408 * but should be handled by another view. 2409 */ 2410 private TouchDelegate mTouchDelegate = null; 2411 2412 /** 2413 * Solid color to use as a background when creating the drawing cache. Enables 2414 * the cache to use 16 bit bitmaps instead of 32 bit. 2415 */ 2416 private int mDrawingCacheBackgroundColor = 0; 2417 2418 /** 2419 * Special tree observer used when mAttachInfo is null. 2420 */ 2421 private ViewTreeObserver mFloatingTreeObserver; 2422 2423 /** 2424 * Cache the touch slop from the context that created the view. 2425 */ 2426 private int mTouchSlop; 2427 2428 /** 2429 * Object that handles automatic animation of view properties. 2430 */ 2431 private ViewPropertyAnimator mAnimator = null; 2432 2433 /** 2434 * Flag indicating that a drag can cross window boundaries. When 2435 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2436 * with this flag set, all visible applications will be able to participate 2437 * in the drag operation and receive the dragged content. 2438 * 2439 * @hide 2440 */ 2441 public static final int DRAG_FLAG_GLOBAL = 1; 2442 2443 /** 2444 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2445 */ 2446 private float mVerticalScrollFactor; 2447 2448 /** 2449 * Position of the vertical scroll bar. 2450 */ 2451 private int mVerticalScrollbarPosition; 2452 2453 /** 2454 * Position the scroll bar at the default position as determined by the system. 2455 */ 2456 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2457 2458 /** 2459 * Position the scroll bar along the left edge. 2460 */ 2461 public static final int SCROLLBAR_POSITION_LEFT = 1; 2462 2463 /** 2464 * Position the scroll bar along the right edge. 2465 */ 2466 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2467 2468 /** 2469 * Indicates that the view does not have a layer. 2470 * 2471 * @see #getLayerType() 2472 * @see #setLayerType(int, android.graphics.Paint) 2473 * @see #LAYER_TYPE_SOFTWARE 2474 * @see #LAYER_TYPE_HARDWARE 2475 */ 2476 public static final int LAYER_TYPE_NONE = 0; 2477 2478 /** 2479 * <p>Indicates that the view has a software layer. A software layer is backed 2480 * by a bitmap and causes the view to be rendered using Android's software 2481 * rendering pipeline, even if hardware acceleration is enabled.</p> 2482 * 2483 * <p>Software layers have various usages:</p> 2484 * <p>When the application is not using hardware acceleration, a software layer 2485 * is useful to apply a specific color filter and/or blending mode and/or 2486 * translucency to a view and all its children.</p> 2487 * <p>When the application is using hardware acceleration, a software layer 2488 * is useful to render drawing primitives not supported by the hardware 2489 * accelerated pipeline. It can also be used to cache a complex view tree 2490 * into a texture and reduce the complexity of drawing operations. For instance, 2491 * when animating a complex view tree with a translation, a software layer can 2492 * be used to render the view tree only once.</p> 2493 * <p>Software layers should be avoided when the affected view tree updates 2494 * often. Every update will require to re-render the software layer, which can 2495 * potentially be slow (particularly when hardware acceleration is turned on 2496 * since the layer will have to be uploaded into a hardware texture after every 2497 * update.)</p> 2498 * 2499 * @see #getLayerType() 2500 * @see #setLayerType(int, android.graphics.Paint) 2501 * @see #LAYER_TYPE_NONE 2502 * @see #LAYER_TYPE_HARDWARE 2503 */ 2504 public static final int LAYER_TYPE_SOFTWARE = 1; 2505 2506 /** 2507 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2508 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2509 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2510 * rendering pipeline, but only if hardware acceleration is turned on for the 2511 * view hierarchy. When hardware acceleration is turned off, hardware layers 2512 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2513 * 2514 * <p>A hardware layer is useful to apply a specific color filter and/or 2515 * blending mode and/or translucency to a view and all its children.</p> 2516 * <p>A hardware layer can be used to cache a complex view tree into a 2517 * texture and reduce the complexity of drawing operations. For instance, 2518 * when animating a complex view tree with a translation, a hardware layer can 2519 * be used to render the view tree only once.</p> 2520 * <p>A hardware layer can also be used to increase the rendering quality when 2521 * rotation transformations are applied on a view. It can also be used to 2522 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2523 * 2524 * @see #getLayerType() 2525 * @see #setLayerType(int, android.graphics.Paint) 2526 * @see #LAYER_TYPE_NONE 2527 * @see #LAYER_TYPE_SOFTWARE 2528 */ 2529 public static final int LAYER_TYPE_HARDWARE = 2; 2530 2531 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2532 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2533 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2534 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2535 }) 2536 int mLayerType = LAYER_TYPE_NONE; 2537 Paint mLayerPaint; 2538 Rect mLocalDirtyRect; 2539 2540 /** 2541 * Set to true when the view is sending hover accessibility events because it 2542 * is the innermost hovered view. 2543 */ 2544 private boolean mSendingHoverAccessibilityEvents; 2545 2546 /** 2547 * Text direction is inherited thru {@link ViewGroup} 2548 * @hide 2549 */ 2550 public static final int TEXT_DIRECTION_INHERIT = 0; 2551 2552 /** 2553 * Text direction is using "first strong algorithm". The first strong directional character 2554 * determines the paragraph direction. If there is no strong directional character, the 2555 * paragraph direction is the view's resolved ayout direction. 2556 * 2557 * @hide 2558 */ 2559 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 2560 2561 /** 2562 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 2563 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 2564 * If there are neither, the paragraph direction is the view's resolved layout direction. 2565 * 2566 * @hide 2567 */ 2568 public static final int TEXT_DIRECTION_ANY_RTL = 2; 2569 2570 /** 2571 * Text direction is the same as the one held by a 60% majority of the characters. If there is 2572 * no majority then the paragraph direction is the resolved layout direction of the View. 2573 * 2574 * @hide 2575 */ 2576 public static final int TEXT_DIRECTION_CHAR_COUNT = 3; 2577 2578 /** 2579 * Text direction is forced to LTR. 2580 * 2581 * @hide 2582 */ 2583 public static final int TEXT_DIRECTION_LTR = 4; 2584 2585 /** 2586 * Text direction is forced to RTL. 2587 * 2588 * @hide 2589 */ 2590 public static final int TEXT_DIRECTION_RTL = 5; 2591 2592 /** 2593 * Default text direction is inherited 2594 */ 2595 protected static int DEFAULT_TEXT_DIRECTION = TEXT_DIRECTION_INHERIT; 2596 2597 /** 2598 * Default threshold for "char count" heuristic. 2599 */ 2600 protected static float DEFAULT_TEXT_DIRECTION_CHAR_COUNT_THRESHOLD = 0.6f; 2601 2602 /** 2603 * The text direction that has been defined by {@link #setTextDirection(int)}. 2604 * 2605 * {@hide} 2606 */ 2607 @ViewDebug.ExportedProperty(category = "text", mapping = { 2608 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2609 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2610 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2611 @ViewDebug.IntToString(from = TEXT_DIRECTION_CHAR_COUNT, to = "CHAR_COUNT"), 2612 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2613 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL") 2614 }) 2615 private int mTextDirection = DEFAULT_TEXT_DIRECTION; 2616 2617 /** 2618 * The resolved text direction. This needs resolution if the value is 2619 * TEXT_DIRECTION_INHERIT. The resolution matches mTextDirection if that is 2620 * not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds up the parent 2621 * chain of the view. 2622 * 2623 * {@hide} 2624 */ 2625 @ViewDebug.ExportedProperty(category = "text", mapping = { 2626 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2627 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2628 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2629 @ViewDebug.IntToString(from = TEXT_DIRECTION_CHAR_COUNT, to = "CHAR_COUNT"), 2630 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2631 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL") 2632 }) 2633 private int mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 2634 2635 /** 2636 * Consistency verifier for debugging purposes. 2637 * @hide 2638 */ 2639 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2640 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2641 new InputEventConsistencyVerifier(this, 0) : null; 2642 2643 /** 2644 * Simple constructor to use when creating a view from code. 2645 * 2646 * @param context The Context the view is running in, through which it can 2647 * access the current theme, resources, etc. 2648 */ 2649 public View(Context context) { 2650 mContext = context; 2651 mResources = context != null ? context.getResources() : null; 2652 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT; 2653 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2654 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2655 mUserPaddingStart = -1; 2656 mUserPaddingEnd = -1; 2657 mUserPaddingRelative = false; 2658 } 2659 2660 /** 2661 * Constructor that is called when inflating a view from XML. This is called 2662 * when a view is being constructed from an XML file, supplying attributes 2663 * that were specified in the XML file. This version uses a default style of 2664 * 0, so the only attribute values applied are those in the Context's Theme 2665 * and the given AttributeSet. 2666 * 2667 * <p> 2668 * The method onFinishInflate() will be called after all children have been 2669 * added. 2670 * 2671 * @param context The Context the view is running in, through which it can 2672 * access the current theme, resources, etc. 2673 * @param attrs The attributes of the XML tag that is inflating the view. 2674 * @see #View(Context, AttributeSet, int) 2675 */ 2676 public View(Context context, AttributeSet attrs) { 2677 this(context, attrs, 0); 2678 } 2679 2680 /** 2681 * Perform inflation from XML and apply a class-specific base style. This 2682 * constructor of View allows subclasses to use their own base style when 2683 * they are inflating. For example, a Button class's constructor would call 2684 * this version of the super class constructor and supply 2685 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2686 * the theme's button style to modify all of the base view attributes (in 2687 * particular its background) as well as the Button class's attributes. 2688 * 2689 * @param context The Context the view is running in, through which it can 2690 * access the current theme, resources, etc. 2691 * @param attrs The attributes of the XML tag that is inflating the view. 2692 * @param defStyle The default style to apply to this view. If 0, no style 2693 * will be applied (beyond what is included in the theme). This may 2694 * either be an attribute resource, whose value will be retrieved 2695 * from the current theme, or an explicit style resource. 2696 * @see #View(Context, AttributeSet) 2697 */ 2698 public View(Context context, AttributeSet attrs, int defStyle) { 2699 this(context); 2700 2701 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2702 defStyle, 0); 2703 2704 Drawable background = null; 2705 2706 int leftPadding = -1; 2707 int topPadding = -1; 2708 int rightPadding = -1; 2709 int bottomPadding = -1; 2710 int startPadding = -1; 2711 int endPadding = -1; 2712 2713 int padding = -1; 2714 2715 int viewFlagValues = 0; 2716 int viewFlagMasks = 0; 2717 2718 boolean setScrollContainer = false; 2719 2720 int x = 0; 2721 int y = 0; 2722 2723 float tx = 0; 2724 float ty = 0; 2725 float rotation = 0; 2726 float rotationX = 0; 2727 float rotationY = 0; 2728 float sx = 1f; 2729 float sy = 1f; 2730 boolean transformSet = false; 2731 2732 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2733 2734 int overScrollMode = mOverScrollMode; 2735 final int N = a.getIndexCount(); 2736 for (int i = 0; i < N; i++) { 2737 int attr = a.getIndex(i); 2738 switch (attr) { 2739 case com.android.internal.R.styleable.View_background: 2740 background = a.getDrawable(attr); 2741 break; 2742 case com.android.internal.R.styleable.View_padding: 2743 padding = a.getDimensionPixelSize(attr, -1); 2744 break; 2745 case com.android.internal.R.styleable.View_paddingLeft: 2746 leftPadding = a.getDimensionPixelSize(attr, -1); 2747 break; 2748 case com.android.internal.R.styleable.View_paddingTop: 2749 topPadding = a.getDimensionPixelSize(attr, -1); 2750 break; 2751 case com.android.internal.R.styleable.View_paddingRight: 2752 rightPadding = a.getDimensionPixelSize(attr, -1); 2753 break; 2754 case com.android.internal.R.styleable.View_paddingBottom: 2755 bottomPadding = a.getDimensionPixelSize(attr, -1); 2756 break; 2757 case com.android.internal.R.styleable.View_paddingStart: 2758 startPadding = a.getDimensionPixelSize(attr, -1); 2759 break; 2760 case com.android.internal.R.styleable.View_paddingEnd: 2761 endPadding = a.getDimensionPixelSize(attr, -1); 2762 break; 2763 case com.android.internal.R.styleable.View_scrollX: 2764 x = a.getDimensionPixelOffset(attr, 0); 2765 break; 2766 case com.android.internal.R.styleable.View_scrollY: 2767 y = a.getDimensionPixelOffset(attr, 0); 2768 break; 2769 case com.android.internal.R.styleable.View_alpha: 2770 setAlpha(a.getFloat(attr, 1f)); 2771 break; 2772 case com.android.internal.R.styleable.View_transformPivotX: 2773 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2774 break; 2775 case com.android.internal.R.styleable.View_transformPivotY: 2776 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2777 break; 2778 case com.android.internal.R.styleable.View_translationX: 2779 tx = a.getDimensionPixelOffset(attr, 0); 2780 transformSet = true; 2781 break; 2782 case com.android.internal.R.styleable.View_translationY: 2783 ty = a.getDimensionPixelOffset(attr, 0); 2784 transformSet = true; 2785 break; 2786 case com.android.internal.R.styleable.View_rotation: 2787 rotation = a.getFloat(attr, 0); 2788 transformSet = true; 2789 break; 2790 case com.android.internal.R.styleable.View_rotationX: 2791 rotationX = a.getFloat(attr, 0); 2792 transformSet = true; 2793 break; 2794 case com.android.internal.R.styleable.View_rotationY: 2795 rotationY = a.getFloat(attr, 0); 2796 transformSet = true; 2797 break; 2798 case com.android.internal.R.styleable.View_scaleX: 2799 sx = a.getFloat(attr, 1f); 2800 transformSet = true; 2801 break; 2802 case com.android.internal.R.styleable.View_scaleY: 2803 sy = a.getFloat(attr, 1f); 2804 transformSet = true; 2805 break; 2806 case com.android.internal.R.styleable.View_id: 2807 mID = a.getResourceId(attr, NO_ID); 2808 break; 2809 case com.android.internal.R.styleable.View_tag: 2810 mTag = a.getText(attr); 2811 break; 2812 case com.android.internal.R.styleable.View_fitsSystemWindows: 2813 if (a.getBoolean(attr, false)) { 2814 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2815 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2816 } 2817 break; 2818 case com.android.internal.R.styleable.View_focusable: 2819 if (a.getBoolean(attr, false)) { 2820 viewFlagValues |= FOCUSABLE; 2821 viewFlagMasks |= FOCUSABLE_MASK; 2822 } 2823 break; 2824 case com.android.internal.R.styleable.View_focusableInTouchMode: 2825 if (a.getBoolean(attr, false)) { 2826 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2827 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2828 } 2829 break; 2830 case com.android.internal.R.styleable.View_clickable: 2831 if (a.getBoolean(attr, false)) { 2832 viewFlagValues |= CLICKABLE; 2833 viewFlagMasks |= CLICKABLE; 2834 } 2835 break; 2836 case com.android.internal.R.styleable.View_longClickable: 2837 if (a.getBoolean(attr, false)) { 2838 viewFlagValues |= LONG_CLICKABLE; 2839 viewFlagMasks |= LONG_CLICKABLE; 2840 } 2841 break; 2842 case com.android.internal.R.styleable.View_saveEnabled: 2843 if (!a.getBoolean(attr, true)) { 2844 viewFlagValues |= SAVE_DISABLED; 2845 viewFlagMasks |= SAVE_DISABLED_MASK; 2846 } 2847 break; 2848 case com.android.internal.R.styleable.View_duplicateParentState: 2849 if (a.getBoolean(attr, false)) { 2850 viewFlagValues |= DUPLICATE_PARENT_STATE; 2851 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2852 } 2853 break; 2854 case com.android.internal.R.styleable.View_visibility: 2855 final int visibility = a.getInt(attr, 0); 2856 if (visibility != 0) { 2857 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2858 viewFlagMasks |= VISIBILITY_MASK; 2859 } 2860 break; 2861 case com.android.internal.R.styleable.View_layoutDirection: 2862 // Clear any HORIZONTAL_DIRECTION flag already set 2863 viewFlagValues &= ~LAYOUT_DIRECTION_MASK; 2864 // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute 2865 final int layoutDirection = a.getInt(attr, -1); 2866 if (layoutDirection != -1) { 2867 viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection]; 2868 } else { 2869 // Set to default (LAYOUT_DIRECTION_INHERIT) 2870 viewFlagValues |= LAYOUT_DIRECTION_DEFAULT; 2871 } 2872 viewFlagMasks |= LAYOUT_DIRECTION_MASK; 2873 break; 2874 case com.android.internal.R.styleable.View_drawingCacheQuality: 2875 final int cacheQuality = a.getInt(attr, 0); 2876 if (cacheQuality != 0) { 2877 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2878 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2879 } 2880 break; 2881 case com.android.internal.R.styleable.View_contentDescription: 2882 mContentDescription = a.getString(attr); 2883 break; 2884 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2885 if (!a.getBoolean(attr, true)) { 2886 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2887 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2888 } 2889 break; 2890 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2891 if (!a.getBoolean(attr, true)) { 2892 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2893 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2894 } 2895 break; 2896 case R.styleable.View_scrollbars: 2897 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2898 if (scrollbars != SCROLLBARS_NONE) { 2899 viewFlagValues |= scrollbars; 2900 viewFlagMasks |= SCROLLBARS_MASK; 2901 initializeScrollbars(a); 2902 } 2903 break; 2904 case R.styleable.View_fadingEdge: 2905 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2906 if (fadingEdge != FADING_EDGE_NONE) { 2907 viewFlagValues |= fadingEdge; 2908 viewFlagMasks |= FADING_EDGE_MASK; 2909 initializeFadingEdge(a); 2910 } 2911 break; 2912 case R.styleable.View_scrollbarStyle: 2913 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2914 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2915 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2916 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2917 } 2918 break; 2919 case R.styleable.View_isScrollContainer: 2920 setScrollContainer = true; 2921 if (a.getBoolean(attr, false)) { 2922 setScrollContainer(true); 2923 } 2924 break; 2925 case com.android.internal.R.styleable.View_keepScreenOn: 2926 if (a.getBoolean(attr, false)) { 2927 viewFlagValues |= KEEP_SCREEN_ON; 2928 viewFlagMasks |= KEEP_SCREEN_ON; 2929 } 2930 break; 2931 case R.styleable.View_filterTouchesWhenObscured: 2932 if (a.getBoolean(attr, false)) { 2933 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2934 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2935 } 2936 break; 2937 case R.styleable.View_nextFocusLeft: 2938 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2939 break; 2940 case R.styleable.View_nextFocusRight: 2941 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2942 break; 2943 case R.styleable.View_nextFocusUp: 2944 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2945 break; 2946 case R.styleable.View_nextFocusDown: 2947 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2948 break; 2949 case R.styleable.View_nextFocusForward: 2950 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2951 break; 2952 case R.styleable.View_minWidth: 2953 mMinWidth = a.getDimensionPixelSize(attr, 0); 2954 break; 2955 case R.styleable.View_minHeight: 2956 mMinHeight = a.getDimensionPixelSize(attr, 0); 2957 break; 2958 case R.styleable.View_onClick: 2959 if (context.isRestricted()) { 2960 throw new IllegalStateException("The android:onClick attribute cannot " 2961 + "be used within a restricted context"); 2962 } 2963 2964 final String handlerName = a.getString(attr); 2965 if (handlerName != null) { 2966 setOnClickListener(new OnClickListener() { 2967 private Method mHandler; 2968 2969 public void onClick(View v) { 2970 if (mHandler == null) { 2971 try { 2972 mHandler = getContext().getClass().getMethod(handlerName, 2973 View.class); 2974 } catch (NoSuchMethodException e) { 2975 int id = getId(); 2976 String idText = id == NO_ID ? "" : " with id '" 2977 + getContext().getResources().getResourceEntryName( 2978 id) + "'"; 2979 throw new IllegalStateException("Could not find a method " + 2980 handlerName + "(View) in the activity " 2981 + getContext().getClass() + " for onClick handler" 2982 + " on view " + View.this.getClass() + idText, e); 2983 } 2984 } 2985 2986 try { 2987 mHandler.invoke(getContext(), View.this); 2988 } catch (IllegalAccessException e) { 2989 throw new IllegalStateException("Could not execute non " 2990 + "public method of the activity", e); 2991 } catch (InvocationTargetException e) { 2992 throw new IllegalStateException("Could not execute " 2993 + "method of the activity", e); 2994 } 2995 } 2996 }); 2997 } 2998 break; 2999 case R.styleable.View_overScrollMode: 3000 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3001 break; 3002 case R.styleable.View_verticalScrollbarPosition: 3003 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3004 break; 3005 case R.styleable.View_layerType: 3006 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3007 break; 3008 case R.styleable.View_textDirection: 3009 mTextDirection = a.getInt(attr, DEFAULT_TEXT_DIRECTION); 3010 break; 3011 } 3012 } 3013 3014 setOverScrollMode(overScrollMode); 3015 3016 if (background != null) { 3017 setBackgroundDrawable(background); 3018 } 3019 3020 mUserPaddingRelative = (startPadding >= 0 || endPadding >= 0); 3021 3022 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3023 // layout direction). Those cached values will be used later during padding resolution. 3024 mUserPaddingStart = startPadding; 3025 mUserPaddingEnd = endPadding; 3026 3027 if (padding >= 0) { 3028 leftPadding = padding; 3029 topPadding = padding; 3030 rightPadding = padding; 3031 bottomPadding = padding; 3032 } 3033 3034 // If the user specified the padding (either with android:padding or 3035 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3036 // use the default padding or the padding from the background drawable 3037 // (stored at this point in mPadding*) 3038 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3039 topPadding >= 0 ? topPadding : mPaddingTop, 3040 rightPadding >= 0 ? rightPadding : mPaddingRight, 3041 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3042 3043 if (viewFlagMasks != 0) { 3044 setFlags(viewFlagValues, viewFlagMasks); 3045 } 3046 3047 // Needs to be called after mViewFlags is set 3048 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3049 recomputePadding(); 3050 } 3051 3052 if (x != 0 || y != 0) { 3053 scrollTo(x, y); 3054 } 3055 3056 if (transformSet) { 3057 setTranslationX(tx); 3058 setTranslationY(ty); 3059 setRotation(rotation); 3060 setRotationX(rotationX); 3061 setRotationY(rotationY); 3062 setScaleX(sx); 3063 setScaleY(sy); 3064 } 3065 3066 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3067 setScrollContainer(true); 3068 } 3069 3070 computeOpaqueFlags(); 3071 3072 a.recycle(); 3073 } 3074 3075 /** 3076 * Non-public constructor for use in testing 3077 */ 3078 View() { 3079 } 3080 3081 /** 3082 * <p> 3083 * Initializes the fading edges from a given set of styled attributes. This 3084 * method should be called by subclasses that need fading edges and when an 3085 * instance of these subclasses is created programmatically rather than 3086 * being inflated from XML. This method is automatically called when the XML 3087 * is inflated. 3088 * </p> 3089 * 3090 * @param a the styled attributes set to initialize the fading edges from 3091 */ 3092 protected void initializeFadingEdge(TypedArray a) { 3093 initScrollCache(); 3094 3095 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3096 R.styleable.View_fadingEdgeLength, 3097 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3098 } 3099 3100 /** 3101 * Returns the size of the vertical faded edges used to indicate that more 3102 * content in this view is visible. 3103 * 3104 * @return The size in pixels of the vertical faded edge or 0 if vertical 3105 * faded edges are not enabled for this view. 3106 * @attr ref android.R.styleable#View_fadingEdgeLength 3107 */ 3108 public int getVerticalFadingEdgeLength() { 3109 if (isVerticalFadingEdgeEnabled()) { 3110 ScrollabilityCache cache = mScrollCache; 3111 if (cache != null) { 3112 return cache.fadingEdgeLength; 3113 } 3114 } 3115 return 0; 3116 } 3117 3118 /** 3119 * Set the size of the faded edge used to indicate that more content in this 3120 * view is available. Will not change whether the fading edge is enabled; use 3121 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3122 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3123 * for the vertical or horizontal fading edges. 3124 * 3125 * @param length The size in pixels of the faded edge used to indicate that more 3126 * content in this view is visible. 3127 */ 3128 public void setFadingEdgeLength(int length) { 3129 initScrollCache(); 3130 mScrollCache.fadingEdgeLength = length; 3131 } 3132 3133 /** 3134 * Returns the size of the horizontal faded edges used to indicate that more 3135 * content in this view is visible. 3136 * 3137 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3138 * faded edges are not enabled for this view. 3139 * @attr ref android.R.styleable#View_fadingEdgeLength 3140 */ 3141 public int getHorizontalFadingEdgeLength() { 3142 if (isHorizontalFadingEdgeEnabled()) { 3143 ScrollabilityCache cache = mScrollCache; 3144 if (cache != null) { 3145 return cache.fadingEdgeLength; 3146 } 3147 } 3148 return 0; 3149 } 3150 3151 /** 3152 * Returns the width of the vertical scrollbar. 3153 * 3154 * @return The width in pixels of the vertical scrollbar or 0 if there 3155 * is no vertical scrollbar. 3156 */ 3157 public int getVerticalScrollbarWidth() { 3158 ScrollabilityCache cache = mScrollCache; 3159 if (cache != null) { 3160 ScrollBarDrawable scrollBar = cache.scrollBar; 3161 if (scrollBar != null) { 3162 int size = scrollBar.getSize(true); 3163 if (size <= 0) { 3164 size = cache.scrollBarSize; 3165 } 3166 return size; 3167 } 3168 return 0; 3169 } 3170 return 0; 3171 } 3172 3173 /** 3174 * Returns the height of the horizontal scrollbar. 3175 * 3176 * @return The height in pixels of the horizontal scrollbar or 0 if 3177 * there is no horizontal scrollbar. 3178 */ 3179 protected int getHorizontalScrollbarHeight() { 3180 ScrollabilityCache cache = mScrollCache; 3181 if (cache != null) { 3182 ScrollBarDrawable scrollBar = cache.scrollBar; 3183 if (scrollBar != null) { 3184 int size = scrollBar.getSize(false); 3185 if (size <= 0) { 3186 size = cache.scrollBarSize; 3187 } 3188 return size; 3189 } 3190 return 0; 3191 } 3192 return 0; 3193 } 3194 3195 /** 3196 * <p> 3197 * Initializes the scrollbars from a given set of styled attributes. This 3198 * method should be called by subclasses that need scrollbars and when an 3199 * instance of these subclasses is created programmatically rather than 3200 * being inflated from XML. This method is automatically called when the XML 3201 * is inflated. 3202 * </p> 3203 * 3204 * @param a the styled attributes set to initialize the scrollbars from 3205 */ 3206 protected void initializeScrollbars(TypedArray a) { 3207 initScrollCache(); 3208 3209 final ScrollabilityCache scrollabilityCache = mScrollCache; 3210 3211 if (scrollabilityCache.scrollBar == null) { 3212 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3213 } 3214 3215 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3216 3217 if (!fadeScrollbars) { 3218 scrollabilityCache.state = ScrollabilityCache.ON; 3219 } 3220 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3221 3222 3223 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3224 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3225 .getScrollBarFadeDuration()); 3226 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3227 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3228 ViewConfiguration.getScrollDefaultDelay()); 3229 3230 3231 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3232 com.android.internal.R.styleable.View_scrollbarSize, 3233 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3234 3235 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3236 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3237 3238 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3239 if (thumb != null) { 3240 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3241 } 3242 3243 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3244 false); 3245 if (alwaysDraw) { 3246 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3247 } 3248 3249 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3250 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3251 3252 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3253 if (thumb != null) { 3254 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3255 } 3256 3257 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3258 false); 3259 if (alwaysDraw) { 3260 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3261 } 3262 3263 // Re-apply user/background padding so that scrollbar(s) get added 3264 resolvePadding(); 3265 } 3266 3267 /** 3268 * <p> 3269 * Initalizes the scrollability cache if necessary. 3270 * </p> 3271 */ 3272 private void initScrollCache() { 3273 if (mScrollCache == null) { 3274 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3275 } 3276 } 3277 3278 /** 3279 * Set the position of the vertical scroll bar. Should be one of 3280 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3281 * {@link #SCROLLBAR_POSITION_RIGHT}. 3282 * 3283 * @param position Where the vertical scroll bar should be positioned. 3284 */ 3285 public void setVerticalScrollbarPosition(int position) { 3286 if (mVerticalScrollbarPosition != position) { 3287 mVerticalScrollbarPosition = position; 3288 computeOpaqueFlags(); 3289 resolvePadding(); 3290 } 3291 } 3292 3293 /** 3294 * @return The position where the vertical scroll bar will show, if applicable. 3295 * @see #setVerticalScrollbarPosition(int) 3296 */ 3297 public int getVerticalScrollbarPosition() { 3298 return mVerticalScrollbarPosition; 3299 } 3300 3301 /** 3302 * Register a callback to be invoked when focus of this view changed. 3303 * 3304 * @param l The callback that will run. 3305 */ 3306 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3307 mOnFocusChangeListener = l; 3308 } 3309 3310 /** 3311 * Add a listener that will be called when the bounds of the view change due to 3312 * layout processing. 3313 * 3314 * @param listener The listener that will be called when layout bounds change. 3315 */ 3316 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3317 if (mOnLayoutChangeListeners == null) { 3318 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3319 } 3320 mOnLayoutChangeListeners.add(listener); 3321 } 3322 3323 /** 3324 * Remove a listener for layout changes. 3325 * 3326 * @param listener The listener for layout bounds change. 3327 */ 3328 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3329 if (mOnLayoutChangeListeners == null) { 3330 return; 3331 } 3332 mOnLayoutChangeListeners.remove(listener); 3333 } 3334 3335 /** 3336 * Add a listener for attach state changes. 3337 * 3338 * This listener will be called whenever this view is attached or detached 3339 * from a window. Remove the listener using 3340 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3341 * 3342 * @param listener Listener to attach 3343 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3344 */ 3345 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3346 if (mOnAttachStateChangeListeners == null) { 3347 mOnAttachStateChangeListeners = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3348 } 3349 mOnAttachStateChangeListeners.add(listener); 3350 } 3351 3352 /** 3353 * Remove a listener for attach state changes. The listener will receive no further 3354 * notification of window attach/detach events. 3355 * 3356 * @param listener Listener to remove 3357 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3358 */ 3359 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3360 if (mOnAttachStateChangeListeners == null) { 3361 return; 3362 } 3363 mOnAttachStateChangeListeners.remove(listener); 3364 } 3365 3366 /** 3367 * Returns the focus-change callback registered for this view. 3368 * 3369 * @return The callback, or null if one is not registered. 3370 */ 3371 public OnFocusChangeListener getOnFocusChangeListener() { 3372 return mOnFocusChangeListener; 3373 } 3374 3375 /** 3376 * Register a callback to be invoked when this view is clicked. If this view is not 3377 * clickable, it becomes clickable. 3378 * 3379 * @param l The callback that will run 3380 * 3381 * @see #setClickable(boolean) 3382 */ 3383 public void setOnClickListener(OnClickListener l) { 3384 if (!isClickable()) { 3385 setClickable(true); 3386 } 3387 mOnClickListener = l; 3388 } 3389 3390 /** 3391 * Register a callback to be invoked when this view is clicked and held. If this view is not 3392 * long clickable, it becomes long clickable. 3393 * 3394 * @param l The callback that will run 3395 * 3396 * @see #setLongClickable(boolean) 3397 */ 3398 public void setOnLongClickListener(OnLongClickListener l) { 3399 if (!isLongClickable()) { 3400 setLongClickable(true); 3401 } 3402 mOnLongClickListener = l; 3403 } 3404 3405 /** 3406 * Register a callback to be invoked when the context menu for this view is 3407 * being built. If this view is not long clickable, it becomes long clickable. 3408 * 3409 * @param l The callback that will run 3410 * 3411 */ 3412 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3413 if (!isLongClickable()) { 3414 setLongClickable(true); 3415 } 3416 mOnCreateContextMenuListener = l; 3417 } 3418 3419 /** 3420 * Call this view's OnClickListener, if it is defined. 3421 * 3422 * @return True there was an assigned OnClickListener that was called, false 3423 * otherwise is returned. 3424 */ 3425 public boolean performClick() { 3426 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3427 3428 if (mOnClickListener != null) { 3429 playSoundEffect(SoundEffectConstants.CLICK); 3430 mOnClickListener.onClick(this); 3431 return true; 3432 } 3433 3434 return false; 3435 } 3436 3437 /** 3438 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3439 * OnLongClickListener did not consume the event. 3440 * 3441 * @return True if one of the above receivers consumed the event, false otherwise. 3442 */ 3443 public boolean performLongClick() { 3444 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3445 3446 boolean handled = false; 3447 if (mOnLongClickListener != null) { 3448 handled = mOnLongClickListener.onLongClick(View.this); 3449 } 3450 if (!handled) { 3451 handled = showContextMenu(); 3452 } 3453 if (handled) { 3454 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3455 } 3456 return handled; 3457 } 3458 3459 /** 3460 * Performs button-related actions during a touch down event. 3461 * 3462 * @param event The event. 3463 * @return True if the down was consumed. 3464 * 3465 * @hide 3466 */ 3467 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3468 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3469 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3470 return true; 3471 } 3472 } 3473 return false; 3474 } 3475 3476 /** 3477 * Bring up the context menu for this view. 3478 * 3479 * @return Whether a context menu was displayed. 3480 */ 3481 public boolean showContextMenu() { 3482 return getParent().showContextMenuForChild(this); 3483 } 3484 3485 /** 3486 * Bring up the context menu for this view, referring to the item under the specified point. 3487 * 3488 * @param x The referenced x coordinate. 3489 * @param y The referenced y coordinate. 3490 * @param metaState The keyboard modifiers that were pressed. 3491 * @return Whether a context menu was displayed. 3492 * 3493 * @hide 3494 */ 3495 public boolean showContextMenu(float x, float y, int metaState) { 3496 return showContextMenu(); 3497 } 3498 3499 /** 3500 * Start an action mode. 3501 * 3502 * @param callback Callback that will control the lifecycle of the action mode 3503 * @return The new action mode if it is started, null otherwise 3504 * 3505 * @see ActionMode 3506 */ 3507 public ActionMode startActionMode(ActionMode.Callback callback) { 3508 return getParent().startActionModeForChild(this, callback); 3509 } 3510 3511 /** 3512 * Register a callback to be invoked when a key is pressed in this view. 3513 * @param l the key listener to attach to this view 3514 */ 3515 public void setOnKeyListener(OnKeyListener l) { 3516 mOnKeyListener = l; 3517 } 3518 3519 /** 3520 * Register a callback to be invoked when a touch event is sent to this view. 3521 * @param l the touch listener to attach to this view 3522 */ 3523 public void setOnTouchListener(OnTouchListener l) { 3524 mOnTouchListener = l; 3525 } 3526 3527 /** 3528 * Register a callback to be invoked when a generic motion event is sent to this view. 3529 * @param l the generic motion listener to attach to this view 3530 */ 3531 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3532 mOnGenericMotionListener = l; 3533 } 3534 3535 /** 3536 * Register a callback to be invoked when a hover event is sent to this view. 3537 * @param l the hover listener to attach to this view 3538 */ 3539 public void setOnHoverListener(OnHoverListener l) { 3540 mOnHoverListener = l; 3541 } 3542 3543 /** 3544 * Register a drag event listener callback object for this View. The parameter is 3545 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3546 * View, the system calls the 3547 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3548 * @param l An implementation of {@link android.view.View.OnDragListener}. 3549 */ 3550 public void setOnDragListener(OnDragListener l) { 3551 mOnDragListener = l; 3552 } 3553 3554 /** 3555 * Give this view focus. This will cause 3556 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3557 * 3558 * Note: this does not check whether this {@link View} should get focus, it just 3559 * gives it focus no matter what. It should only be called internally by framework 3560 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3561 * 3562 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3563 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3564 * focus moved when requestFocus() is called. It may not always 3565 * apply, in which case use the default View.FOCUS_DOWN. 3566 * @param previouslyFocusedRect The rectangle of the view that had focus 3567 * prior in this View's coordinate system. 3568 */ 3569 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3570 if (DBG) { 3571 System.out.println(this + " requestFocus()"); 3572 } 3573 3574 if ((mPrivateFlags & FOCUSED) == 0) { 3575 mPrivateFlags |= FOCUSED; 3576 3577 if (mParent != null) { 3578 mParent.requestChildFocus(this, this); 3579 } 3580 3581 onFocusChanged(true, direction, previouslyFocusedRect); 3582 refreshDrawableState(); 3583 } 3584 } 3585 3586 /** 3587 * Request that a rectangle of this view be visible on the screen, 3588 * scrolling if necessary just enough. 3589 * 3590 * <p>A View should call this if it maintains some notion of which part 3591 * of its content is interesting. For example, a text editing view 3592 * should call this when its cursor moves. 3593 * 3594 * @param rectangle The rectangle. 3595 * @return Whether any parent scrolled. 3596 */ 3597 public boolean requestRectangleOnScreen(Rect rectangle) { 3598 return requestRectangleOnScreen(rectangle, false); 3599 } 3600 3601 /** 3602 * Request that a rectangle of this view be visible on the screen, 3603 * scrolling if necessary just enough. 3604 * 3605 * <p>A View should call this if it maintains some notion of which part 3606 * of its content is interesting. For example, a text editing view 3607 * should call this when its cursor moves. 3608 * 3609 * <p>When <code>immediate</code> is set to true, scrolling will not be 3610 * animated. 3611 * 3612 * @param rectangle The rectangle. 3613 * @param immediate True to forbid animated scrolling, false otherwise 3614 * @return Whether any parent scrolled. 3615 */ 3616 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3617 View child = this; 3618 ViewParent parent = mParent; 3619 boolean scrolled = false; 3620 while (parent != null) { 3621 scrolled |= parent.requestChildRectangleOnScreen(child, 3622 rectangle, immediate); 3623 3624 // offset rect so next call has the rectangle in the 3625 // coordinate system of its direct child. 3626 rectangle.offset(child.getLeft(), child.getTop()); 3627 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3628 3629 if (!(parent instanceof View)) { 3630 break; 3631 } 3632 3633 child = (View) parent; 3634 parent = child.getParent(); 3635 } 3636 return scrolled; 3637 } 3638 3639 /** 3640 * Called when this view wants to give up focus. This will cause 3641 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3642 */ 3643 public void clearFocus() { 3644 if (DBG) { 3645 System.out.println(this + " clearFocus()"); 3646 } 3647 3648 if ((mPrivateFlags & FOCUSED) != 0) { 3649 mPrivateFlags &= ~FOCUSED; 3650 3651 if (mParent != null) { 3652 mParent.clearChildFocus(this); 3653 } 3654 3655 onFocusChanged(false, 0, null); 3656 refreshDrawableState(); 3657 } 3658 } 3659 3660 /** 3661 * Called to clear the focus of a view that is about to be removed. 3662 * Doesn't call clearChildFocus, which prevents this view from taking 3663 * focus again before it has been removed from the parent 3664 */ 3665 void clearFocusForRemoval() { 3666 if ((mPrivateFlags & FOCUSED) != 0) { 3667 mPrivateFlags &= ~FOCUSED; 3668 3669 onFocusChanged(false, 0, null); 3670 refreshDrawableState(); 3671 } 3672 } 3673 3674 /** 3675 * Called internally by the view system when a new view is getting focus. 3676 * This is what clears the old focus. 3677 */ 3678 void unFocus() { 3679 if (DBG) { 3680 System.out.println(this + " unFocus()"); 3681 } 3682 3683 if ((mPrivateFlags & FOCUSED) != 0) { 3684 mPrivateFlags &= ~FOCUSED; 3685 3686 onFocusChanged(false, 0, null); 3687 refreshDrawableState(); 3688 } 3689 } 3690 3691 /** 3692 * Returns true if this view has focus iteself, or is the ancestor of the 3693 * view that has focus. 3694 * 3695 * @return True if this view has or contains focus, false otherwise. 3696 */ 3697 @ViewDebug.ExportedProperty(category = "focus") 3698 public boolean hasFocus() { 3699 return (mPrivateFlags & FOCUSED) != 0; 3700 } 3701 3702 /** 3703 * Returns true if this view is focusable or if it contains a reachable View 3704 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3705 * is a View whose parents do not block descendants focus. 3706 * 3707 * Only {@link #VISIBLE} views are considered focusable. 3708 * 3709 * @return True if the view is focusable or if the view contains a focusable 3710 * View, false otherwise. 3711 * 3712 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3713 */ 3714 public boolean hasFocusable() { 3715 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3716 } 3717 3718 /** 3719 * Called by the view system when the focus state of this view changes. 3720 * When the focus change event is caused by directional navigation, direction 3721 * and previouslyFocusedRect provide insight into where the focus is coming from. 3722 * When overriding, be sure to call up through to the super class so that 3723 * the standard focus handling will occur. 3724 * 3725 * @param gainFocus True if the View has focus; false otherwise. 3726 * @param direction The direction focus has moved when requestFocus() 3727 * is called to give this view focus. Values are 3728 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3729 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3730 * It may not always apply, in which case use the default. 3731 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3732 * system, of the previously focused view. If applicable, this will be 3733 * passed in as finer grained information about where the focus is coming 3734 * from (in addition to direction). Will be <code>null</code> otherwise. 3735 */ 3736 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3737 if (gainFocus) { 3738 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3739 } 3740 3741 InputMethodManager imm = InputMethodManager.peekInstance(); 3742 if (!gainFocus) { 3743 if (isPressed()) { 3744 setPressed(false); 3745 } 3746 if (imm != null && mAttachInfo != null 3747 && mAttachInfo.mHasWindowFocus) { 3748 imm.focusOut(this); 3749 } 3750 onFocusLost(); 3751 } else if (imm != null && mAttachInfo != null 3752 && mAttachInfo.mHasWindowFocus) { 3753 imm.focusIn(this); 3754 } 3755 3756 invalidate(true); 3757 if (mOnFocusChangeListener != null) { 3758 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3759 } 3760 3761 if (mAttachInfo != null) { 3762 mAttachInfo.mKeyDispatchState.reset(this); 3763 } 3764 } 3765 3766 /** 3767 * Sends an accessibility event of the given type. If accessiiblity is 3768 * not enabled this method has no effect. The default implementation calls 3769 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3770 * to populate information about the event source (this View), then calls 3771 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3772 * populate the text content of the event source including its descendants, 3773 * and last calls 3774 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3775 * on its parent to resuest sending of the event to interested parties. 3776 * 3777 * @param eventType The type of the event to send. 3778 * 3779 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3780 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3781 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3782 */ 3783 public void sendAccessibilityEvent(int eventType) { 3784 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3785 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3786 } 3787 } 3788 3789 /** 3790 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3791 * takes as an argument an empty {@link AccessibilityEvent} and does not 3792 * perfrom a check whether accessibility is enabled. 3793 * 3794 * @param event The event to send. 3795 * 3796 * @see #sendAccessibilityEvent(int) 3797 */ 3798 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3799 if (!isShown()) { 3800 return; 3801 } 3802 onInitializeAccessibilityEvent(event); 3803 dispatchPopulateAccessibilityEvent(event); 3804 // In the beginning we called #isShown(), so we know that getParent() is not null. 3805 getParent().requestSendAccessibilityEvent(this, event); 3806 } 3807 3808 /** 3809 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 3810 * to its children for adding their text content to the event. Note that the 3811 * event text is populated in a separate dispatch path since we add to the 3812 * event not only the text of the source but also the text of all its descendants. 3813 * </p> 3814 * A typical implementation will call 3815 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 3816 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3817 * on each child. Override this method if custom population of the event text 3818 * content is required. 3819 * 3820 * @param event The event. 3821 * 3822 * @return True if the event population was completed. 3823 */ 3824 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3825 onPopulateAccessibilityEvent(event); 3826 return false; 3827 } 3828 3829 /** 3830 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3831 * giving a chance to this View to populate the accessibility event with its 3832 * text content. While the implementation is free to modify other event 3833 * attributes this should be performed in 3834 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 3835 * <p> 3836 * Example: Adding formatted date string to an accessibility event in addition 3837 * to the text added by the super implementation. 3838 * </p><p><pre><code> 3839 * public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3840 * super.onPopulateAccessibilityEvent(event); 3841 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 3842 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 3843 * mCurrentDate.getTimeInMillis(), flags); 3844 * event.getText().add(selectedDateUtterance); 3845 * } 3846 * </code></pre></p> 3847 * 3848 * @param event The accessibility event which to populate. 3849 * 3850 * @see #sendAccessibilityEvent(int) 3851 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3852 */ 3853 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3854 } 3855 3856 /** 3857 * Initializes an {@link AccessibilityEvent} with information about the 3858 * the type of the event and this View which is the event source. In other 3859 * words, the source of an accessibility event is the view whose state 3860 * change triggered firing the event. 3861 * <p> 3862 * Example: Setting the password property of an event in addition 3863 * to properties set by the super implementation. 3864 * </p><p><pre><code> 3865 * public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3866 * super.onInitializeAccessibilityEvent(event); 3867 * event.setPassword(true); 3868 * } 3869 * </code></pre></p> 3870 * @param event The event to initialeze. 3871 * 3872 * @see #sendAccessibilityEvent(int) 3873 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3874 */ 3875 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3876 event.setSource(this); 3877 event.setClassName(getClass().getName()); 3878 event.setPackageName(getContext().getPackageName()); 3879 event.setEnabled(isEnabled()); 3880 event.setContentDescription(mContentDescription); 3881 3882 final int eventType = event.getEventType(); 3883 switch (eventType) { 3884 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 3885 if (mAttachInfo != null) { 3886 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3887 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 3888 FOCUSABLES_ALL); 3889 event.setItemCount(focusablesTempList.size()); 3890 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3891 focusablesTempList.clear(); 3892 } 3893 } break; 3894 case AccessibilityEvent.TYPE_VIEW_SCROLLED: { 3895 event.setScrollX(mScrollX); 3896 event.setScrollY(mScrollY); 3897 event.setItemCount(getHeight()); 3898 } break; 3899 } 3900 } 3901 3902 /** 3903 * Returns an {@link AccessibilityNodeInfo} representing this view from the 3904 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 3905 * This method is responsible for obtaining an accessibility node info from a 3906 * pool of reusable instances and calling 3907 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 3908 * initialize the former. 3909 * <p> 3910 * Note: The client is responsible for recycling the obtained instance by calling 3911 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 3912 * </p> 3913 * @return A populated {@link AccessibilityNodeInfo}. 3914 * 3915 * @see AccessibilityNodeInfo 3916 */ 3917 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 3918 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 3919 onInitializeAccessibilityNodeInfo(info); 3920 return info; 3921 } 3922 3923 /** 3924 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 3925 * The base implementation sets: 3926 * <ul> 3927 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 3928 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 3929 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 3930 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 3931 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 3932 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 3933 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 3934 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 3935 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 3936 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 3937 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 3938 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 3939 * </ul> 3940 * <p> 3941 * Subclasses should override this method, call the super implementation, 3942 * and set additional attributes. 3943 * </p> 3944 * @param info The instance to initialize. 3945 */ 3946 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 3947 Rect bounds = mAttachInfo.mTmpInvalRect; 3948 getDrawingRect(bounds); 3949 info.setBoundsInParent(bounds); 3950 3951 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 3952 getLocationOnScreen(locationOnScreen); 3953 bounds.offsetTo(0, 0); 3954 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 3955 info.setBoundsInScreen(bounds); 3956 3957 ViewParent parent = getParent(); 3958 if (parent instanceof View) { 3959 View parentView = (View) parent; 3960 info.setParent(parentView); 3961 } 3962 3963 info.setPackageName(mContext.getPackageName()); 3964 info.setClassName(getClass().getName()); 3965 info.setContentDescription(getContentDescription()); 3966 3967 info.setEnabled(isEnabled()); 3968 info.setClickable(isClickable()); 3969 info.setFocusable(isFocusable()); 3970 info.setFocused(isFocused()); 3971 info.setSelected(isSelected()); 3972 info.setLongClickable(isLongClickable()); 3973 3974 // TODO: These make sense only if we are in an AdapterView but all 3975 // views can be selected. Maybe from accessiiblity perspective 3976 // we should report as selectable view in an AdapterView. 3977 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 3978 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 3979 3980 if (isFocusable()) { 3981 if (isFocused()) { 3982 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 3983 } else { 3984 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 3985 } 3986 } 3987 } 3988 3989 /** 3990 * Gets the unique identifier of this view on the screen for accessibility purposes. 3991 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 3992 * 3993 * @return The view accessibility id. 3994 * 3995 * @hide 3996 */ 3997 public int getAccessibilityViewId() { 3998 if (mAccessibilityViewId == NO_ID) { 3999 mAccessibilityViewId = sNextAccessibilityViewId++; 4000 } 4001 return mAccessibilityViewId; 4002 } 4003 4004 /** 4005 * Gets the unique identifier of the window in which this View reseides. 4006 * 4007 * @return The window accessibility id. 4008 * 4009 * @hide 4010 */ 4011 public int getAccessibilityWindowId() { 4012 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4013 } 4014 4015 /** 4016 * Gets the {@link View} description. It briefly describes the view and is 4017 * primarily used for accessibility support. Set this property to enable 4018 * better accessibility support for your application. This is especially 4019 * true for views that do not have textual representation (For example, 4020 * ImageButton). 4021 * 4022 * @return The content descriptiopn. 4023 * 4024 * @attr ref android.R.styleable#View_contentDescription 4025 */ 4026 public CharSequence getContentDescription() { 4027 return mContentDescription; 4028 } 4029 4030 /** 4031 * Sets the {@link View} description. It briefly describes the view and is 4032 * primarily used for accessibility support. Set this property to enable 4033 * better accessibility support for your application. This is especially 4034 * true for views that do not have textual representation (For example, 4035 * ImageButton). 4036 * 4037 * @param contentDescription The content description. 4038 * 4039 * @attr ref android.R.styleable#View_contentDescription 4040 */ 4041 public void setContentDescription(CharSequence contentDescription) { 4042 mContentDescription = contentDescription; 4043 } 4044 4045 /** 4046 * Invoked whenever this view loses focus, either by losing window focus or by losing 4047 * focus within its window. This method can be used to clear any state tied to the 4048 * focus. For instance, if a button is held pressed with the trackball and the window 4049 * loses focus, this method can be used to cancel the press. 4050 * 4051 * Subclasses of View overriding this method should always call super.onFocusLost(). 4052 * 4053 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4054 * @see #onWindowFocusChanged(boolean) 4055 * 4056 * @hide pending API council approval 4057 */ 4058 protected void onFocusLost() { 4059 resetPressedState(); 4060 } 4061 4062 private void resetPressedState() { 4063 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4064 return; 4065 } 4066 4067 if (isPressed()) { 4068 setPressed(false); 4069 4070 if (!mHasPerformedLongPress) { 4071 removeLongPressCallback(); 4072 } 4073 } 4074 } 4075 4076 /** 4077 * Returns true if this view has focus 4078 * 4079 * @return True if this view has focus, false otherwise. 4080 */ 4081 @ViewDebug.ExportedProperty(category = "focus") 4082 public boolean isFocused() { 4083 return (mPrivateFlags & FOCUSED) != 0; 4084 } 4085 4086 /** 4087 * Find the view in the hierarchy rooted at this view that currently has 4088 * focus. 4089 * 4090 * @return The view that currently has focus, or null if no focused view can 4091 * be found. 4092 */ 4093 public View findFocus() { 4094 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4095 } 4096 4097 /** 4098 * Change whether this view is one of the set of scrollable containers in 4099 * its window. This will be used to determine whether the window can 4100 * resize or must pan when a soft input area is open -- scrollable 4101 * containers allow the window to use resize mode since the container 4102 * will appropriately shrink. 4103 */ 4104 public void setScrollContainer(boolean isScrollContainer) { 4105 if (isScrollContainer) { 4106 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4107 mAttachInfo.mScrollContainers.add(this); 4108 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4109 } 4110 mPrivateFlags |= SCROLL_CONTAINER; 4111 } else { 4112 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4113 mAttachInfo.mScrollContainers.remove(this); 4114 } 4115 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4116 } 4117 } 4118 4119 /** 4120 * Returns the quality of the drawing cache. 4121 * 4122 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4123 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4124 * 4125 * @see #setDrawingCacheQuality(int) 4126 * @see #setDrawingCacheEnabled(boolean) 4127 * @see #isDrawingCacheEnabled() 4128 * 4129 * @attr ref android.R.styleable#View_drawingCacheQuality 4130 */ 4131 public int getDrawingCacheQuality() { 4132 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4133 } 4134 4135 /** 4136 * Set the drawing cache quality of this view. This value is used only when the 4137 * drawing cache is enabled 4138 * 4139 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4140 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4141 * 4142 * @see #getDrawingCacheQuality() 4143 * @see #setDrawingCacheEnabled(boolean) 4144 * @see #isDrawingCacheEnabled() 4145 * 4146 * @attr ref android.R.styleable#View_drawingCacheQuality 4147 */ 4148 public void setDrawingCacheQuality(int quality) { 4149 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4150 } 4151 4152 /** 4153 * Returns whether the screen should remain on, corresponding to the current 4154 * value of {@link #KEEP_SCREEN_ON}. 4155 * 4156 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4157 * 4158 * @see #setKeepScreenOn(boolean) 4159 * 4160 * @attr ref android.R.styleable#View_keepScreenOn 4161 */ 4162 public boolean getKeepScreenOn() { 4163 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4164 } 4165 4166 /** 4167 * Controls whether the screen should remain on, modifying the 4168 * value of {@link #KEEP_SCREEN_ON}. 4169 * 4170 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4171 * 4172 * @see #getKeepScreenOn() 4173 * 4174 * @attr ref android.R.styleable#View_keepScreenOn 4175 */ 4176 public void setKeepScreenOn(boolean keepScreenOn) { 4177 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4178 } 4179 4180 /** 4181 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4182 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4183 * 4184 * @attr ref android.R.styleable#View_nextFocusLeft 4185 */ 4186 public int getNextFocusLeftId() { 4187 return mNextFocusLeftId; 4188 } 4189 4190 /** 4191 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4192 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4193 * decide automatically. 4194 * 4195 * @attr ref android.R.styleable#View_nextFocusLeft 4196 */ 4197 public void setNextFocusLeftId(int nextFocusLeftId) { 4198 mNextFocusLeftId = nextFocusLeftId; 4199 } 4200 4201 /** 4202 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4203 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4204 * 4205 * @attr ref android.R.styleable#View_nextFocusRight 4206 */ 4207 public int getNextFocusRightId() { 4208 return mNextFocusRightId; 4209 } 4210 4211 /** 4212 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4213 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4214 * decide automatically. 4215 * 4216 * @attr ref android.R.styleable#View_nextFocusRight 4217 */ 4218 public void setNextFocusRightId(int nextFocusRightId) { 4219 mNextFocusRightId = nextFocusRightId; 4220 } 4221 4222 /** 4223 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4224 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4225 * 4226 * @attr ref android.R.styleable#View_nextFocusUp 4227 */ 4228 public int getNextFocusUpId() { 4229 return mNextFocusUpId; 4230 } 4231 4232 /** 4233 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4234 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4235 * decide automatically. 4236 * 4237 * @attr ref android.R.styleable#View_nextFocusUp 4238 */ 4239 public void setNextFocusUpId(int nextFocusUpId) { 4240 mNextFocusUpId = nextFocusUpId; 4241 } 4242 4243 /** 4244 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4245 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4246 * 4247 * @attr ref android.R.styleable#View_nextFocusDown 4248 */ 4249 public int getNextFocusDownId() { 4250 return mNextFocusDownId; 4251 } 4252 4253 /** 4254 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4255 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4256 * decide automatically. 4257 * 4258 * @attr ref android.R.styleable#View_nextFocusDown 4259 */ 4260 public void setNextFocusDownId(int nextFocusDownId) { 4261 mNextFocusDownId = nextFocusDownId; 4262 } 4263 4264 /** 4265 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4266 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4267 * 4268 * @attr ref android.R.styleable#View_nextFocusForward 4269 */ 4270 public int getNextFocusForwardId() { 4271 return mNextFocusForwardId; 4272 } 4273 4274 /** 4275 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4276 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4277 * decide automatically. 4278 * 4279 * @attr ref android.R.styleable#View_nextFocusForward 4280 */ 4281 public void setNextFocusForwardId(int nextFocusForwardId) { 4282 mNextFocusForwardId = nextFocusForwardId; 4283 } 4284 4285 /** 4286 * Returns the visibility of this view and all of its ancestors 4287 * 4288 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4289 */ 4290 public boolean isShown() { 4291 View current = this; 4292 //noinspection ConstantConditions 4293 do { 4294 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4295 return false; 4296 } 4297 ViewParent parent = current.mParent; 4298 if (parent == null) { 4299 return false; // We are not attached to the view root 4300 } 4301 if (!(parent instanceof View)) { 4302 return true; 4303 } 4304 current = (View) parent; 4305 } while (current != null); 4306 4307 return false; 4308 } 4309 4310 /** 4311 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4312 * is set 4313 * 4314 * @param insets Insets for system windows 4315 * 4316 * @return True if this view applied the insets, false otherwise 4317 */ 4318 protected boolean fitSystemWindows(Rect insets) { 4319 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4320 mPaddingLeft = insets.left; 4321 mPaddingTop = insets.top; 4322 mPaddingRight = insets.right; 4323 mPaddingBottom = insets.bottom; 4324 requestLayout(); 4325 return true; 4326 } 4327 return false; 4328 } 4329 4330 /** 4331 * Set whether or not this view should account for system screen decorations 4332 * such as the status bar and inset its content. This allows this view to be 4333 * positioned in absolute screen coordinates and remain visible to the user. 4334 * 4335 * <p>This should only be used by top-level window decor views. 4336 * 4337 * @param fitSystemWindows true to inset content for system screen decorations, false for 4338 * default behavior. 4339 * 4340 * @attr ref android.R.styleable#View_fitsSystemWindows 4341 */ 4342 public void setFitsSystemWindows(boolean fitSystemWindows) { 4343 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 4344 } 4345 4346 /** 4347 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 4348 * will account for system screen decorations such as the status bar and inset its 4349 * content. This allows the view to be positioned in absolute screen coordinates 4350 * and remain visible to the user. 4351 * 4352 * @return true if this view will adjust its content bounds for system screen decorations. 4353 * 4354 * @attr ref android.R.styleable#View_fitsSystemWindows 4355 */ 4356 public boolean fitsSystemWindows() { 4357 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 4358 } 4359 4360 /** 4361 * Returns the visibility status for this view. 4362 * 4363 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4364 * @attr ref android.R.styleable#View_visibility 4365 */ 4366 @ViewDebug.ExportedProperty(mapping = { 4367 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4368 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4369 @ViewDebug.IntToString(from = GONE, to = "GONE") 4370 }) 4371 public int getVisibility() { 4372 return mViewFlags & VISIBILITY_MASK; 4373 } 4374 4375 /** 4376 * Set the enabled state of this view. 4377 * 4378 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4379 * @attr ref android.R.styleable#View_visibility 4380 */ 4381 @RemotableViewMethod 4382 public void setVisibility(int visibility) { 4383 setFlags(visibility, VISIBILITY_MASK); 4384 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4385 } 4386 4387 /** 4388 * Returns the enabled status for this view. The interpretation of the 4389 * enabled state varies by subclass. 4390 * 4391 * @return True if this view is enabled, false otherwise. 4392 */ 4393 @ViewDebug.ExportedProperty 4394 public boolean isEnabled() { 4395 return (mViewFlags & ENABLED_MASK) == ENABLED; 4396 } 4397 4398 /** 4399 * Set the enabled state of this view. The interpretation of the enabled 4400 * state varies by subclass. 4401 * 4402 * @param enabled True if this view is enabled, false otherwise. 4403 */ 4404 @RemotableViewMethod 4405 public void setEnabled(boolean enabled) { 4406 if (enabled == isEnabled()) return; 4407 4408 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4409 4410 /* 4411 * The View most likely has to change its appearance, so refresh 4412 * the drawable state. 4413 */ 4414 refreshDrawableState(); 4415 4416 // Invalidate too, since the default behavior for views is to be 4417 // be drawn at 50% alpha rather than to change the drawable. 4418 invalidate(true); 4419 } 4420 4421 /** 4422 * Set whether this view can receive the focus. 4423 * 4424 * Setting this to false will also ensure that this view is not focusable 4425 * in touch mode. 4426 * 4427 * @param focusable If true, this view can receive the focus. 4428 * 4429 * @see #setFocusableInTouchMode(boolean) 4430 * @attr ref android.R.styleable#View_focusable 4431 */ 4432 public void setFocusable(boolean focusable) { 4433 if (!focusable) { 4434 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4435 } 4436 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4437 } 4438 4439 /** 4440 * Set whether this view can receive focus while in touch mode. 4441 * 4442 * Setting this to true will also ensure that this view is focusable. 4443 * 4444 * @param focusableInTouchMode If true, this view can receive the focus while 4445 * in touch mode. 4446 * 4447 * @see #setFocusable(boolean) 4448 * @attr ref android.R.styleable#View_focusableInTouchMode 4449 */ 4450 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4451 // Focusable in touch mode should always be set before the focusable flag 4452 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4453 // which, in touch mode, will not successfully request focus on this view 4454 // because the focusable in touch mode flag is not set 4455 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4456 if (focusableInTouchMode) { 4457 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4458 } 4459 } 4460 4461 /** 4462 * Set whether this view should have sound effects enabled for events such as 4463 * clicking and touching. 4464 * 4465 * <p>You may wish to disable sound effects for a view if you already play sounds, 4466 * for instance, a dial key that plays dtmf tones. 4467 * 4468 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4469 * @see #isSoundEffectsEnabled() 4470 * @see #playSoundEffect(int) 4471 * @attr ref android.R.styleable#View_soundEffectsEnabled 4472 */ 4473 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4474 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4475 } 4476 4477 /** 4478 * @return whether this view should have sound effects enabled for events such as 4479 * clicking and touching. 4480 * 4481 * @see #setSoundEffectsEnabled(boolean) 4482 * @see #playSoundEffect(int) 4483 * @attr ref android.R.styleable#View_soundEffectsEnabled 4484 */ 4485 @ViewDebug.ExportedProperty 4486 public boolean isSoundEffectsEnabled() { 4487 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4488 } 4489 4490 /** 4491 * Set whether this view should have haptic feedback for events such as 4492 * long presses. 4493 * 4494 * <p>You may wish to disable haptic feedback if your view already controls 4495 * its own haptic feedback. 4496 * 4497 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4498 * @see #isHapticFeedbackEnabled() 4499 * @see #performHapticFeedback(int) 4500 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4501 */ 4502 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4503 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4504 } 4505 4506 /** 4507 * @return whether this view should have haptic feedback enabled for events 4508 * long presses. 4509 * 4510 * @see #setHapticFeedbackEnabled(boolean) 4511 * @see #performHapticFeedback(int) 4512 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4513 */ 4514 @ViewDebug.ExportedProperty 4515 public boolean isHapticFeedbackEnabled() { 4516 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4517 } 4518 4519 /** 4520 * Returns the layout direction for this view. 4521 * 4522 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4523 * {@link #LAYOUT_DIRECTION_RTL}, 4524 * {@link #LAYOUT_DIRECTION_INHERIT} or 4525 * {@link #LAYOUT_DIRECTION_LOCALE}. 4526 * @attr ref android.R.styleable#View_layoutDirection 4527 * 4528 * @hide 4529 */ 4530 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4531 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4532 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4533 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4534 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4535 }) 4536 public int getLayoutDirection() { 4537 return mViewFlags & LAYOUT_DIRECTION_MASK; 4538 } 4539 4540 /** 4541 * Set the layout direction for this view. This will propagate a reset of layout direction 4542 * resolution to the view's children and resolve layout direction for this view. 4543 * 4544 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4545 * {@link #LAYOUT_DIRECTION_RTL}, 4546 * {@link #LAYOUT_DIRECTION_INHERIT} or 4547 * {@link #LAYOUT_DIRECTION_LOCALE}. 4548 * 4549 * @attr ref android.R.styleable#View_layoutDirection 4550 * 4551 * @hide 4552 */ 4553 @RemotableViewMethod 4554 public void setLayoutDirection(int layoutDirection) { 4555 if (getLayoutDirection() != layoutDirection) { 4556 resetResolvedLayoutDirection(); 4557 // Setting the flag will also request a layout. 4558 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4559 } 4560 } 4561 4562 /** 4563 * Returns the resolved layout direction for this view. 4564 * 4565 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4566 * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL. 4567 * 4568 * @hide 4569 */ 4570 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4571 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4572 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4573 }) 4574 public int getResolvedLayoutDirection() { 4575 resolveLayoutDirectionIfNeeded(); 4576 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 4577 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4578 } 4579 4580 /** 4581 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 4582 * layout attribute and/or the inherited value from the parent.</p> 4583 * 4584 * @return true if the layout is right-to-left. 4585 * 4586 * @hide 4587 */ 4588 @ViewDebug.ExportedProperty(category = "layout") 4589 public boolean isLayoutRtl() { 4590 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4591 } 4592 4593 /** 4594 * If this view doesn't do any drawing on its own, set this flag to 4595 * allow further optimizations. By default, this flag is not set on 4596 * View, but could be set on some View subclasses such as ViewGroup. 4597 * 4598 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4599 * you should clear this flag. 4600 * 4601 * @param willNotDraw whether or not this View draw on its own 4602 */ 4603 public void setWillNotDraw(boolean willNotDraw) { 4604 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4605 } 4606 4607 /** 4608 * Returns whether or not this View draws on its own. 4609 * 4610 * @return true if this view has nothing to draw, false otherwise 4611 */ 4612 @ViewDebug.ExportedProperty(category = "drawing") 4613 public boolean willNotDraw() { 4614 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4615 } 4616 4617 /** 4618 * When a View's drawing cache is enabled, drawing is redirected to an 4619 * offscreen bitmap. Some views, like an ImageView, must be able to 4620 * bypass this mechanism if they already draw a single bitmap, to avoid 4621 * unnecessary usage of the memory. 4622 * 4623 * @param willNotCacheDrawing true if this view does not cache its 4624 * drawing, false otherwise 4625 */ 4626 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 4627 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 4628 } 4629 4630 /** 4631 * Returns whether or not this View can cache its drawing or not. 4632 * 4633 * @return true if this view does not cache its drawing, false otherwise 4634 */ 4635 @ViewDebug.ExportedProperty(category = "drawing") 4636 public boolean willNotCacheDrawing() { 4637 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 4638 } 4639 4640 /** 4641 * Indicates whether this view reacts to click events or not. 4642 * 4643 * @return true if the view is clickable, false otherwise 4644 * 4645 * @see #setClickable(boolean) 4646 * @attr ref android.R.styleable#View_clickable 4647 */ 4648 @ViewDebug.ExportedProperty 4649 public boolean isClickable() { 4650 return (mViewFlags & CLICKABLE) == CLICKABLE; 4651 } 4652 4653 /** 4654 * Enables or disables click events for this view. When a view 4655 * is clickable it will change its state to "pressed" on every click. 4656 * Subclasses should set the view clickable to visually react to 4657 * user's clicks. 4658 * 4659 * @param clickable true to make the view clickable, false otherwise 4660 * 4661 * @see #isClickable() 4662 * @attr ref android.R.styleable#View_clickable 4663 */ 4664 public void setClickable(boolean clickable) { 4665 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 4666 } 4667 4668 /** 4669 * Indicates whether this view reacts to long click events or not. 4670 * 4671 * @return true if the view is long clickable, false otherwise 4672 * 4673 * @see #setLongClickable(boolean) 4674 * @attr ref android.R.styleable#View_longClickable 4675 */ 4676 public boolean isLongClickable() { 4677 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4678 } 4679 4680 /** 4681 * Enables or disables long click events for this view. When a view is long 4682 * clickable it reacts to the user holding down the button for a longer 4683 * duration than a tap. This event can either launch the listener or a 4684 * context menu. 4685 * 4686 * @param longClickable true to make the view long clickable, false otherwise 4687 * @see #isLongClickable() 4688 * @attr ref android.R.styleable#View_longClickable 4689 */ 4690 public void setLongClickable(boolean longClickable) { 4691 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4692 } 4693 4694 /** 4695 * Sets the pressed state for this view. 4696 * 4697 * @see #isClickable() 4698 * @see #setClickable(boolean) 4699 * 4700 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4701 * the View's internal state from a previously set "pressed" state. 4702 */ 4703 public void setPressed(boolean pressed) { 4704 if (pressed) { 4705 mPrivateFlags |= PRESSED; 4706 } else { 4707 mPrivateFlags &= ~PRESSED; 4708 } 4709 refreshDrawableState(); 4710 dispatchSetPressed(pressed); 4711 } 4712 4713 /** 4714 * Dispatch setPressed to all of this View's children. 4715 * 4716 * @see #setPressed(boolean) 4717 * 4718 * @param pressed The new pressed state 4719 */ 4720 protected void dispatchSetPressed(boolean pressed) { 4721 } 4722 4723 /** 4724 * Indicates whether the view is currently in pressed state. Unless 4725 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 4726 * the pressed state. 4727 * 4728 * @see #setPressed(boolean) 4729 * @see #isClickable() 4730 * @see #setClickable(boolean) 4731 * 4732 * @return true if the view is currently pressed, false otherwise 4733 */ 4734 public boolean isPressed() { 4735 return (mPrivateFlags & PRESSED) == PRESSED; 4736 } 4737 4738 /** 4739 * Indicates whether this view will save its state (that is, 4740 * whether its {@link #onSaveInstanceState} method will be called). 4741 * 4742 * @return Returns true if the view state saving is enabled, else false. 4743 * 4744 * @see #setSaveEnabled(boolean) 4745 * @attr ref android.R.styleable#View_saveEnabled 4746 */ 4747 public boolean isSaveEnabled() { 4748 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 4749 } 4750 4751 /** 4752 * Controls whether the saving of this view's state is 4753 * enabled (that is, whether its {@link #onSaveInstanceState} method 4754 * will be called). Note that even if freezing is enabled, the 4755 * view still must have an id assigned to it (via {@link #setId(int)}) 4756 * for its state to be saved. This flag can only disable the 4757 * saving of this view; any child views may still have their state saved. 4758 * 4759 * @param enabled Set to false to <em>disable</em> state saving, or true 4760 * (the default) to allow it. 4761 * 4762 * @see #isSaveEnabled() 4763 * @see #setId(int) 4764 * @see #onSaveInstanceState() 4765 * @attr ref android.R.styleable#View_saveEnabled 4766 */ 4767 public void setSaveEnabled(boolean enabled) { 4768 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 4769 } 4770 4771 /** 4772 * Gets whether the framework should discard touches when the view's 4773 * window is obscured by another visible window. 4774 * Refer to the {@link View} security documentation for more details. 4775 * 4776 * @return True if touch filtering is enabled. 4777 * 4778 * @see #setFilterTouchesWhenObscured(boolean) 4779 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4780 */ 4781 @ViewDebug.ExportedProperty 4782 public boolean getFilterTouchesWhenObscured() { 4783 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4784 } 4785 4786 /** 4787 * Sets whether the framework should discard touches when the view's 4788 * window is obscured by another visible window. 4789 * Refer to the {@link View} security documentation for more details. 4790 * 4791 * @param enabled True if touch filtering should be enabled. 4792 * 4793 * @see #getFilterTouchesWhenObscured 4794 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4795 */ 4796 public void setFilterTouchesWhenObscured(boolean enabled) { 4797 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4798 FILTER_TOUCHES_WHEN_OBSCURED); 4799 } 4800 4801 /** 4802 * Indicates whether the entire hierarchy under this view will save its 4803 * state when a state saving traversal occurs from its parent. The default 4804 * is true; if false, these views will not be saved unless 4805 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4806 * 4807 * @return Returns true if the view state saving from parent is enabled, else false. 4808 * 4809 * @see #setSaveFromParentEnabled(boolean) 4810 */ 4811 public boolean isSaveFromParentEnabled() { 4812 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4813 } 4814 4815 /** 4816 * Controls whether the entire hierarchy under this view will save its 4817 * state when a state saving traversal occurs from its parent. The default 4818 * is true; if false, these views will not be saved unless 4819 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4820 * 4821 * @param enabled Set to false to <em>disable</em> state saving, or true 4822 * (the default) to allow it. 4823 * 4824 * @see #isSaveFromParentEnabled() 4825 * @see #setId(int) 4826 * @see #onSaveInstanceState() 4827 */ 4828 public void setSaveFromParentEnabled(boolean enabled) { 4829 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4830 } 4831 4832 4833 /** 4834 * Returns whether this View is able to take focus. 4835 * 4836 * @return True if this view can take focus, or false otherwise. 4837 * @attr ref android.R.styleable#View_focusable 4838 */ 4839 @ViewDebug.ExportedProperty(category = "focus") 4840 public final boolean isFocusable() { 4841 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4842 } 4843 4844 /** 4845 * When a view is focusable, it may not want to take focus when in touch mode. 4846 * For example, a button would like focus when the user is navigating via a D-pad 4847 * so that the user can click on it, but once the user starts touching the screen, 4848 * the button shouldn't take focus 4849 * @return Whether the view is focusable in touch mode. 4850 * @attr ref android.R.styleable#View_focusableInTouchMode 4851 */ 4852 @ViewDebug.ExportedProperty 4853 public final boolean isFocusableInTouchMode() { 4854 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4855 } 4856 4857 /** 4858 * Find the nearest view in the specified direction that can take focus. 4859 * This does not actually give focus to that view. 4860 * 4861 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4862 * 4863 * @return The nearest focusable in the specified direction, or null if none 4864 * can be found. 4865 */ 4866 public View focusSearch(int direction) { 4867 if (mParent != null) { 4868 return mParent.focusSearch(this, direction); 4869 } else { 4870 return null; 4871 } 4872 } 4873 4874 /** 4875 * This method is the last chance for the focused view and its ancestors to 4876 * respond to an arrow key. This is called when the focused view did not 4877 * consume the key internally, nor could the view system find a new view in 4878 * the requested direction to give focus to. 4879 * 4880 * @param focused The currently focused view. 4881 * @param direction The direction focus wants to move. One of FOCUS_UP, 4882 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4883 * @return True if the this view consumed this unhandled move. 4884 */ 4885 public boolean dispatchUnhandledMove(View focused, int direction) { 4886 return false; 4887 } 4888 4889 /** 4890 * If a user manually specified the next view id for a particular direction, 4891 * use the root to look up the view. 4892 * @param root The root view of the hierarchy containing this view. 4893 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4894 * or FOCUS_BACKWARD. 4895 * @return The user specified next view, or null if there is none. 4896 */ 4897 View findUserSetNextFocus(View root, int direction) { 4898 switch (direction) { 4899 case FOCUS_LEFT: 4900 if (mNextFocusLeftId == View.NO_ID) return null; 4901 return findViewShouldExist(root, mNextFocusLeftId); 4902 case FOCUS_RIGHT: 4903 if (mNextFocusRightId == View.NO_ID) return null; 4904 return findViewShouldExist(root, mNextFocusRightId); 4905 case FOCUS_UP: 4906 if (mNextFocusUpId == View.NO_ID) return null; 4907 return findViewShouldExist(root, mNextFocusUpId); 4908 case FOCUS_DOWN: 4909 if (mNextFocusDownId == View.NO_ID) return null; 4910 return findViewShouldExist(root, mNextFocusDownId); 4911 case FOCUS_FORWARD: 4912 if (mNextFocusForwardId == View.NO_ID) return null; 4913 return findViewShouldExist(root, mNextFocusForwardId); 4914 case FOCUS_BACKWARD: { 4915 final int id = mID; 4916 return root.findViewByPredicate(new Predicate<View>() { 4917 @Override 4918 public boolean apply(View t) { 4919 return t.mNextFocusForwardId == id; 4920 } 4921 }); 4922 } 4923 } 4924 return null; 4925 } 4926 4927 private static View findViewShouldExist(View root, int childViewId) { 4928 View result = root.findViewById(childViewId); 4929 if (result == null) { 4930 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4931 + "by user for id " + childViewId); 4932 } 4933 return result; 4934 } 4935 4936 /** 4937 * Find and return all focusable views that are descendants of this view, 4938 * possibly including this view if it is focusable itself. 4939 * 4940 * @param direction The direction of the focus 4941 * @return A list of focusable views 4942 */ 4943 public ArrayList<View> getFocusables(int direction) { 4944 ArrayList<View> result = new ArrayList<View>(24); 4945 addFocusables(result, direction); 4946 return result; 4947 } 4948 4949 /** 4950 * Add any focusable views that are descendants of this view (possibly 4951 * including this view if it is focusable itself) to views. If we are in touch mode, 4952 * only add views that are also focusable in touch mode. 4953 * 4954 * @param views Focusable views found so far 4955 * @param direction The direction of the focus 4956 */ 4957 public void addFocusables(ArrayList<View> views, int direction) { 4958 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4959 } 4960 4961 /** 4962 * Adds any focusable views that are descendants of this view (possibly 4963 * including this view if it is focusable itself) to views. This method 4964 * adds all focusable views regardless if we are in touch mode or 4965 * only views focusable in touch mode if we are in touch mode depending on 4966 * the focusable mode paramater. 4967 * 4968 * @param views Focusable views found so far or null if all we are interested is 4969 * the number of focusables. 4970 * @param direction The direction of the focus. 4971 * @param focusableMode The type of focusables to be added. 4972 * 4973 * @see #FOCUSABLES_ALL 4974 * @see #FOCUSABLES_TOUCH_MODE 4975 */ 4976 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4977 if (!isFocusable()) { 4978 return; 4979 } 4980 4981 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4982 isInTouchMode() && !isFocusableInTouchMode()) { 4983 return; 4984 } 4985 4986 if (views != null) { 4987 views.add(this); 4988 } 4989 } 4990 4991 /** 4992 * Finds the Views that contain given text. The containment is case insensitive. 4993 * As View's text is considered any text content that View renders. 4994 * 4995 * @param outViews The output list of matching Views. 4996 * @param text The text to match against. 4997 */ 4998 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 4999 } 5000 5001 /** 5002 * Find and return all touchable views that are descendants of this view, 5003 * possibly including this view if it is touchable itself. 5004 * 5005 * @return A list of touchable views 5006 */ 5007 public ArrayList<View> getTouchables() { 5008 ArrayList<View> result = new ArrayList<View>(); 5009 addTouchables(result); 5010 return result; 5011 } 5012 5013 /** 5014 * Add any touchable views that are descendants of this view (possibly 5015 * including this view if it is touchable itself) to views. 5016 * 5017 * @param views Touchable views found so far 5018 */ 5019 public void addTouchables(ArrayList<View> views) { 5020 final int viewFlags = mViewFlags; 5021 5022 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5023 && (viewFlags & ENABLED_MASK) == ENABLED) { 5024 views.add(this); 5025 } 5026 } 5027 5028 /** 5029 * Call this to try to give focus to a specific view or to one of its 5030 * descendants. 5031 * 5032 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5033 * false), or if it is focusable and it is not focusable in touch mode 5034 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5035 * 5036 * See also {@link #focusSearch(int)}, which is what you call to say that you 5037 * have focus, and you want your parent to look for the next one. 5038 * 5039 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 5040 * {@link #FOCUS_DOWN} and <code>null</code>. 5041 * 5042 * @return Whether this view or one of its descendants actually took focus. 5043 */ 5044 public final boolean requestFocus() { 5045 return requestFocus(View.FOCUS_DOWN); 5046 } 5047 5048 5049 /** 5050 * Call this to try to give focus to a specific view or to one of its 5051 * descendants and give it a hint about what direction focus is heading. 5052 * 5053 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5054 * false), or if it is focusable and it is not focusable in touch mode 5055 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5056 * 5057 * See also {@link #focusSearch(int)}, which is what you call to say that you 5058 * have focus, and you want your parent to look for the next one. 5059 * 5060 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 5061 * <code>null</code> set for the previously focused rectangle. 5062 * 5063 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5064 * @return Whether this view or one of its descendants actually took focus. 5065 */ 5066 public final boolean requestFocus(int direction) { 5067 return requestFocus(direction, null); 5068 } 5069 5070 /** 5071 * Call this to try to give focus to a specific view or to one of its descendants 5072 * and give it hints about the direction and a specific rectangle that the focus 5073 * is coming from. The rectangle can help give larger views a finer grained hint 5074 * about where focus is coming from, and therefore, where to show selection, or 5075 * forward focus change internally. 5076 * 5077 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5078 * false), or if it is focusable and it is not focusable in touch mode 5079 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5080 * 5081 * A View will not take focus if it is not visible. 5082 * 5083 * A View will not take focus if one of its parents has 5084 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 5085 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 5086 * 5087 * See also {@link #focusSearch(int)}, which is what you call to say that you 5088 * have focus, and you want your parent to look for the next one. 5089 * 5090 * You may wish to override this method if your custom {@link View} has an internal 5091 * {@link View} that it wishes to forward the request to. 5092 * 5093 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5094 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 5095 * to give a finer grained hint about where focus is coming from. May be null 5096 * if there is no hint. 5097 * @return Whether this view or one of its descendants actually took focus. 5098 */ 5099 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 5100 // need to be focusable 5101 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 5102 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5103 return false; 5104 } 5105 5106 // need to be focusable in touch mode if in touch mode 5107 if (isInTouchMode() && 5108 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 5109 return false; 5110 } 5111 5112 // need to not have any parents blocking us 5113 if (hasAncestorThatBlocksDescendantFocus()) { 5114 return false; 5115 } 5116 5117 handleFocusGainInternal(direction, previouslyFocusedRect); 5118 return true; 5119 } 5120 5121 /** Gets the ViewAncestor, or null if not attached. */ 5122 /*package*/ ViewRootImpl getViewRootImpl() { 5123 View root = getRootView(); 5124 return root != null ? (ViewRootImpl)root.getParent() : null; 5125 } 5126 5127 /** 5128 * Call this to try to give focus to a specific view or to one of its descendants. This is a 5129 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 5130 * touch mode to request focus when they are touched. 5131 * 5132 * @return Whether this view or one of its descendants actually took focus. 5133 * 5134 * @see #isInTouchMode() 5135 * 5136 */ 5137 public final boolean requestFocusFromTouch() { 5138 // Leave touch mode if we need to 5139 if (isInTouchMode()) { 5140 ViewRootImpl viewRoot = getViewRootImpl(); 5141 if (viewRoot != null) { 5142 viewRoot.ensureTouchMode(false); 5143 } 5144 } 5145 return requestFocus(View.FOCUS_DOWN); 5146 } 5147 5148 /** 5149 * @return Whether any ancestor of this view blocks descendant focus. 5150 */ 5151 private boolean hasAncestorThatBlocksDescendantFocus() { 5152 ViewParent ancestor = mParent; 5153 while (ancestor instanceof ViewGroup) { 5154 final ViewGroup vgAncestor = (ViewGroup) ancestor; 5155 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 5156 return true; 5157 } else { 5158 ancestor = vgAncestor.getParent(); 5159 } 5160 } 5161 return false; 5162 } 5163 5164 /** 5165 * @hide 5166 */ 5167 public void dispatchStartTemporaryDetach() { 5168 onStartTemporaryDetach(); 5169 } 5170 5171 /** 5172 * This is called when a container is going to temporarily detach a child, with 5173 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 5174 * It will either be followed by {@link #onFinishTemporaryDetach()} or 5175 * {@link #onDetachedFromWindow()} when the container is done. 5176 */ 5177 public void onStartTemporaryDetach() { 5178 removeUnsetPressCallback(); 5179 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 5180 } 5181 5182 /** 5183 * @hide 5184 */ 5185 public void dispatchFinishTemporaryDetach() { 5186 onFinishTemporaryDetach(); 5187 } 5188 5189 /** 5190 * Called after {@link #onStartTemporaryDetach} when the container is done 5191 * changing the view. 5192 */ 5193 public void onFinishTemporaryDetach() { 5194 } 5195 5196 /** 5197 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 5198 * for this view's window. Returns null if the view is not currently attached 5199 * to the window. Normally you will not need to use this directly, but 5200 * just use the standard high-level event callbacks like 5201 * {@link #onKeyDown(int, KeyEvent)}. 5202 */ 5203 public KeyEvent.DispatcherState getKeyDispatcherState() { 5204 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 5205 } 5206 5207 /** 5208 * Dispatch a key event before it is processed by any input method 5209 * associated with the view hierarchy. This can be used to intercept 5210 * key events in special situations before the IME consumes them; a 5211 * typical example would be handling the BACK key to update the application's 5212 * UI instead of allowing the IME to see it and close itself. 5213 * 5214 * @param event The key event to be dispatched. 5215 * @return True if the event was handled, false otherwise. 5216 */ 5217 public boolean dispatchKeyEventPreIme(KeyEvent event) { 5218 return onKeyPreIme(event.getKeyCode(), event); 5219 } 5220 5221 /** 5222 * Dispatch a key event to the next view on the focus path. This path runs 5223 * from the top of the view tree down to the currently focused view. If this 5224 * view has focus, it will dispatch to itself. Otherwise it will dispatch 5225 * the next node down the focus path. This method also fires any key 5226 * listeners. 5227 * 5228 * @param event The key event to be dispatched. 5229 * @return True if the event was handled, false otherwise. 5230 */ 5231 public boolean dispatchKeyEvent(KeyEvent event) { 5232 if (mInputEventConsistencyVerifier != null) { 5233 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 5234 } 5235 5236 // Give any attached key listener a first crack at the event. 5237 //noinspection SimplifiableIfStatement 5238 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5239 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 5240 return true; 5241 } 5242 5243 if (event.dispatch(this, mAttachInfo != null 5244 ? mAttachInfo.mKeyDispatchState : null, this)) { 5245 return true; 5246 } 5247 5248 if (mInputEventConsistencyVerifier != null) { 5249 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5250 } 5251 return false; 5252 } 5253 5254 /** 5255 * Dispatches a key shortcut event. 5256 * 5257 * @param event The key event to be dispatched. 5258 * @return True if the event was handled by the view, false otherwise. 5259 */ 5260 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5261 return onKeyShortcut(event.getKeyCode(), event); 5262 } 5263 5264 /** 5265 * Pass the touch screen motion event down to the target view, or this 5266 * view if it is the target. 5267 * 5268 * @param event The motion event to be dispatched. 5269 * @return True if the event was handled by the view, false otherwise. 5270 */ 5271 public boolean dispatchTouchEvent(MotionEvent event) { 5272 if (mInputEventConsistencyVerifier != null) { 5273 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5274 } 5275 5276 if (onFilterTouchEventForSecurity(event)) { 5277 //noinspection SimplifiableIfStatement 5278 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 5279 mOnTouchListener.onTouch(this, event)) { 5280 return true; 5281 } 5282 5283 if (onTouchEvent(event)) { 5284 return true; 5285 } 5286 } 5287 5288 if (mInputEventConsistencyVerifier != null) { 5289 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5290 } 5291 return false; 5292 } 5293 5294 /** 5295 * Filter the touch event to apply security policies. 5296 * 5297 * @param event The motion event to be filtered. 5298 * @return True if the event should be dispatched, false if the event should be dropped. 5299 * 5300 * @see #getFilterTouchesWhenObscured 5301 */ 5302 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5303 //noinspection RedundantIfStatement 5304 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5305 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5306 // Window is obscured, drop this touch. 5307 return false; 5308 } 5309 return true; 5310 } 5311 5312 /** 5313 * Pass a trackball motion event down to the focused view. 5314 * 5315 * @param event The motion event to be dispatched. 5316 * @return True if the event was handled by the view, false otherwise. 5317 */ 5318 public boolean dispatchTrackballEvent(MotionEvent event) { 5319 if (mInputEventConsistencyVerifier != null) { 5320 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5321 } 5322 5323 return onTrackballEvent(event); 5324 } 5325 5326 /** 5327 * Dispatch a generic motion event. 5328 * <p> 5329 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5330 * are delivered to the view under the pointer. All other generic motion events are 5331 * delivered to the focused view. Hover events are handled specially and are delivered 5332 * to {@link #onHoverEvent(MotionEvent)}. 5333 * </p> 5334 * 5335 * @param event The motion event to be dispatched. 5336 * @return True if the event was handled by the view, false otherwise. 5337 */ 5338 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5339 if (mInputEventConsistencyVerifier != null) { 5340 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5341 } 5342 5343 final int source = event.getSource(); 5344 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5345 final int action = event.getAction(); 5346 if (action == MotionEvent.ACTION_HOVER_ENTER 5347 || action == MotionEvent.ACTION_HOVER_MOVE 5348 || action == MotionEvent.ACTION_HOVER_EXIT) { 5349 if (dispatchHoverEvent(event)) { 5350 // For compatibility with existing applications that handled HOVER_MOVE 5351 // events in onGenericMotionEvent, dispatch the event there. The 5352 // onHoverEvent method did not exist at the time. 5353 if (action == MotionEvent.ACTION_HOVER_MOVE) { 5354 dispatchGenericMotionEventInternal(event); 5355 } 5356 return true; 5357 } 5358 } else if (dispatchGenericPointerEvent(event)) { 5359 return true; 5360 } 5361 } else if (dispatchGenericFocusedEvent(event)) { 5362 return true; 5363 } 5364 5365 if (dispatchGenericMotionEventInternal(event)) { 5366 return true; 5367 } 5368 5369 if (mInputEventConsistencyVerifier != null) { 5370 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5371 } 5372 return false; 5373 } 5374 5375 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 5376 //noinspection SimplifiableIfStatement 5377 if (mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5378 && mOnGenericMotionListener.onGenericMotion(this, event)) { 5379 return true; 5380 } 5381 5382 if (onGenericMotionEvent(event)) { 5383 return true; 5384 } 5385 5386 if (mInputEventConsistencyVerifier != null) { 5387 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5388 } 5389 return false; 5390 } 5391 5392 /** 5393 * Dispatch a hover event. 5394 * <p> 5395 * Do not call this method directly. 5396 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5397 * </p> 5398 * 5399 * @param event The motion event to be dispatched. 5400 * @return True if the event was handled by the view, false otherwise. 5401 */ 5402 protected boolean dispatchHoverEvent(MotionEvent event) { 5403 switch (event.getAction()) { 5404 case MotionEvent.ACTION_HOVER_ENTER: 5405 if (!hasHoveredChild() && !mSendingHoverAccessibilityEvents) { 5406 mSendingHoverAccessibilityEvents = true; 5407 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 5408 } 5409 break; 5410 case MotionEvent.ACTION_HOVER_EXIT: 5411 if (mSendingHoverAccessibilityEvents) { 5412 mSendingHoverAccessibilityEvents = false; 5413 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 5414 } 5415 break; 5416 } 5417 5418 //noinspection SimplifiableIfStatement 5419 if (mOnHoverListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5420 && mOnHoverListener.onHover(this, event)) { 5421 return true; 5422 } 5423 5424 return onHoverEvent(event); 5425 } 5426 5427 /** 5428 * Returns true if the view has a child to which it has recently sent 5429 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 5430 * it does not have a hovered child, then it must be the innermost hovered view. 5431 * @hide 5432 */ 5433 protected boolean hasHoveredChild() { 5434 return false; 5435 } 5436 5437 /** 5438 * Dispatch a generic motion event to the view under the first pointer. 5439 * <p> 5440 * Do not call this method directly. 5441 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5442 * </p> 5443 * 5444 * @param event The motion event to be dispatched. 5445 * @return True if the event was handled by the view, false otherwise. 5446 */ 5447 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5448 return false; 5449 } 5450 5451 /** 5452 * Dispatch a generic motion event to the currently focused view. 5453 * <p> 5454 * Do not call this method directly. 5455 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5456 * </p> 5457 * 5458 * @param event The motion event to be dispatched. 5459 * @return True if the event was handled by the view, false otherwise. 5460 */ 5461 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5462 return false; 5463 } 5464 5465 /** 5466 * Dispatch a pointer event. 5467 * <p> 5468 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5469 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5470 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5471 * and should not be expected to handle other pointing device features. 5472 * </p> 5473 * 5474 * @param event The motion event to be dispatched. 5475 * @return True if the event was handled by the view, false otherwise. 5476 * @hide 5477 */ 5478 public final boolean dispatchPointerEvent(MotionEvent event) { 5479 if (event.isTouchEvent()) { 5480 return dispatchTouchEvent(event); 5481 } else { 5482 return dispatchGenericMotionEvent(event); 5483 } 5484 } 5485 5486 /** 5487 * Called when the window containing this view gains or loses window focus. 5488 * ViewGroups should override to route to their children. 5489 * 5490 * @param hasFocus True if the window containing this view now has focus, 5491 * false otherwise. 5492 */ 5493 public void dispatchWindowFocusChanged(boolean hasFocus) { 5494 onWindowFocusChanged(hasFocus); 5495 } 5496 5497 /** 5498 * Called when the window containing this view gains or loses focus. Note 5499 * that this is separate from view focus: to receive key events, both 5500 * your view and its window must have focus. If a window is displayed 5501 * on top of yours that takes input focus, then your own window will lose 5502 * focus but the view focus will remain unchanged. 5503 * 5504 * @param hasWindowFocus True if the window containing this view now has 5505 * focus, false otherwise. 5506 */ 5507 public void onWindowFocusChanged(boolean hasWindowFocus) { 5508 InputMethodManager imm = InputMethodManager.peekInstance(); 5509 if (!hasWindowFocus) { 5510 if (isPressed()) { 5511 setPressed(false); 5512 } 5513 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5514 imm.focusOut(this); 5515 } 5516 removeLongPressCallback(); 5517 removeTapCallback(); 5518 onFocusLost(); 5519 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5520 imm.focusIn(this); 5521 } 5522 refreshDrawableState(); 5523 } 5524 5525 /** 5526 * Returns true if this view is in a window that currently has window focus. 5527 * Note that this is not the same as the view itself having focus. 5528 * 5529 * @return True if this view is in a window that currently has window focus. 5530 */ 5531 public boolean hasWindowFocus() { 5532 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5533 } 5534 5535 /** 5536 * Dispatch a view visibility change down the view hierarchy. 5537 * ViewGroups should override to route to their children. 5538 * @param changedView The view whose visibility changed. Could be 'this' or 5539 * an ancestor view. 5540 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5541 * {@link #INVISIBLE} or {@link #GONE}. 5542 */ 5543 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5544 onVisibilityChanged(changedView, visibility); 5545 } 5546 5547 /** 5548 * Called when the visibility of the view or an ancestor of the view is changed. 5549 * @param changedView The view whose visibility changed. Could be 'this' or 5550 * an ancestor view. 5551 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5552 * {@link #INVISIBLE} or {@link #GONE}. 5553 */ 5554 protected void onVisibilityChanged(View changedView, int visibility) { 5555 if (visibility == VISIBLE) { 5556 if (mAttachInfo != null) { 5557 initialAwakenScrollBars(); 5558 } else { 5559 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5560 } 5561 } 5562 } 5563 5564 /** 5565 * Dispatch a hint about whether this view is displayed. For instance, when 5566 * a View moves out of the screen, it might receives a display hint indicating 5567 * the view is not displayed. Applications should not <em>rely</em> on this hint 5568 * as there is no guarantee that they will receive one. 5569 * 5570 * @param hint A hint about whether or not this view is displayed: 5571 * {@link #VISIBLE} or {@link #INVISIBLE}. 5572 */ 5573 public void dispatchDisplayHint(int hint) { 5574 onDisplayHint(hint); 5575 } 5576 5577 /** 5578 * Gives this view a hint about whether is displayed or not. For instance, when 5579 * a View moves out of the screen, it might receives a display hint indicating 5580 * the view is not displayed. Applications should not <em>rely</em> on this hint 5581 * as there is no guarantee that they will receive one. 5582 * 5583 * @param hint A hint about whether or not this view is displayed: 5584 * {@link #VISIBLE} or {@link #INVISIBLE}. 5585 */ 5586 protected void onDisplayHint(int hint) { 5587 } 5588 5589 /** 5590 * Dispatch a window visibility change down the view hierarchy. 5591 * ViewGroups should override to route to their children. 5592 * 5593 * @param visibility The new visibility of the window. 5594 * 5595 * @see #onWindowVisibilityChanged(int) 5596 */ 5597 public void dispatchWindowVisibilityChanged(int visibility) { 5598 onWindowVisibilityChanged(visibility); 5599 } 5600 5601 /** 5602 * Called when the window containing has change its visibility 5603 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5604 * that this tells you whether or not your window is being made visible 5605 * to the window manager; this does <em>not</em> tell you whether or not 5606 * your window is obscured by other windows on the screen, even if it 5607 * is itself visible. 5608 * 5609 * @param visibility The new visibility of the window. 5610 */ 5611 protected void onWindowVisibilityChanged(int visibility) { 5612 if (visibility == VISIBLE) { 5613 initialAwakenScrollBars(); 5614 } 5615 } 5616 5617 /** 5618 * Returns the current visibility of the window this view is attached to 5619 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 5620 * 5621 * @return Returns the current visibility of the view's window. 5622 */ 5623 public int getWindowVisibility() { 5624 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 5625 } 5626 5627 /** 5628 * Retrieve the overall visible display size in which the window this view is 5629 * attached to has been positioned in. This takes into account screen 5630 * decorations above the window, for both cases where the window itself 5631 * is being position inside of them or the window is being placed under 5632 * then and covered insets are used for the window to position its content 5633 * inside. In effect, this tells you the available area where content can 5634 * be placed and remain visible to users. 5635 * 5636 * <p>This function requires an IPC back to the window manager to retrieve 5637 * the requested information, so should not be used in performance critical 5638 * code like drawing. 5639 * 5640 * @param outRect Filled in with the visible display frame. If the view 5641 * is not attached to a window, this is simply the raw display size. 5642 */ 5643 public void getWindowVisibleDisplayFrame(Rect outRect) { 5644 if (mAttachInfo != null) { 5645 try { 5646 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 5647 } catch (RemoteException e) { 5648 return; 5649 } 5650 // XXX This is really broken, and probably all needs to be done 5651 // in the window manager, and we need to know more about whether 5652 // we want the area behind or in front of the IME. 5653 final Rect insets = mAttachInfo.mVisibleInsets; 5654 outRect.left += insets.left; 5655 outRect.top += insets.top; 5656 outRect.right -= insets.right; 5657 outRect.bottom -= insets.bottom; 5658 return; 5659 } 5660 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 5661 d.getRectSize(outRect); 5662 } 5663 5664 /** 5665 * Dispatch a notification about a resource configuration change down 5666 * the view hierarchy. 5667 * ViewGroups should override to route to their children. 5668 * 5669 * @param newConfig The new resource configuration. 5670 * 5671 * @see #onConfigurationChanged(android.content.res.Configuration) 5672 */ 5673 public void dispatchConfigurationChanged(Configuration newConfig) { 5674 onConfigurationChanged(newConfig); 5675 } 5676 5677 /** 5678 * Called when the current configuration of the resources being used 5679 * by the application have changed. You can use this to decide when 5680 * to reload resources that can changed based on orientation and other 5681 * configuration characterstics. You only need to use this if you are 5682 * not relying on the normal {@link android.app.Activity} mechanism of 5683 * recreating the activity instance upon a configuration change. 5684 * 5685 * @param newConfig The new resource configuration. 5686 */ 5687 protected void onConfigurationChanged(Configuration newConfig) { 5688 } 5689 5690 /** 5691 * Private function to aggregate all per-view attributes in to the view 5692 * root. 5693 */ 5694 void dispatchCollectViewAttributes(int visibility) { 5695 performCollectViewAttributes(visibility); 5696 } 5697 5698 void performCollectViewAttributes(int visibility) { 5699 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 5700 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 5701 mAttachInfo.mKeepScreenOn = true; 5702 } 5703 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 5704 if (mOnSystemUiVisibilityChangeListener != null) { 5705 mAttachInfo.mHasSystemUiListeners = true; 5706 } 5707 } 5708 } 5709 5710 void needGlobalAttributesUpdate(boolean force) { 5711 final AttachInfo ai = mAttachInfo; 5712 if (ai != null) { 5713 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 5714 || ai.mHasSystemUiListeners) { 5715 ai.mRecomputeGlobalAttributes = true; 5716 } 5717 } 5718 } 5719 5720 /** 5721 * Returns whether the device is currently in touch mode. Touch mode is entered 5722 * once the user begins interacting with the device by touch, and affects various 5723 * things like whether focus is always visible to the user. 5724 * 5725 * @return Whether the device is in touch mode. 5726 */ 5727 @ViewDebug.ExportedProperty 5728 public boolean isInTouchMode() { 5729 if (mAttachInfo != null) { 5730 return mAttachInfo.mInTouchMode; 5731 } else { 5732 return ViewRootImpl.isInTouchMode(); 5733 } 5734 } 5735 5736 /** 5737 * Returns the context the view is running in, through which it can 5738 * access the current theme, resources, etc. 5739 * 5740 * @return The view's Context. 5741 */ 5742 @ViewDebug.CapturedViewProperty 5743 public final Context getContext() { 5744 return mContext; 5745 } 5746 5747 /** 5748 * Handle a key event before it is processed by any input method 5749 * associated with the view hierarchy. This can be used to intercept 5750 * key events in special situations before the IME consumes them; a 5751 * typical example would be handling the BACK key to update the application's 5752 * UI instead of allowing the IME to see it and close itself. 5753 * 5754 * @param keyCode The value in event.getKeyCode(). 5755 * @param event Description of the key event. 5756 * @return If you handled the event, return true. If you want to allow the 5757 * event to be handled by the next receiver, return false. 5758 */ 5759 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 5760 return false; 5761 } 5762 5763 /** 5764 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 5765 * KeyEvent.Callback.onKeyDown()}: perform press of the view 5766 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 5767 * is released, if the view is enabled and clickable. 5768 * 5769 * @param keyCode A key code that represents the button pressed, from 5770 * {@link android.view.KeyEvent}. 5771 * @param event The KeyEvent object that defines the button action. 5772 */ 5773 public boolean onKeyDown(int keyCode, KeyEvent event) { 5774 boolean result = false; 5775 5776 switch (keyCode) { 5777 case KeyEvent.KEYCODE_DPAD_CENTER: 5778 case KeyEvent.KEYCODE_ENTER: { 5779 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5780 return true; 5781 } 5782 // Long clickable items don't necessarily have to be clickable 5783 if (((mViewFlags & CLICKABLE) == CLICKABLE || 5784 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 5785 (event.getRepeatCount() == 0)) { 5786 setPressed(true); 5787 checkForLongClick(0); 5788 return true; 5789 } 5790 break; 5791 } 5792 } 5793 return result; 5794 } 5795 5796 /** 5797 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 5798 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 5799 * the event). 5800 */ 5801 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 5802 return false; 5803 } 5804 5805 /** 5806 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 5807 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 5808 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 5809 * {@link KeyEvent#KEYCODE_ENTER} is released. 5810 * 5811 * @param keyCode A key code that represents the button pressed, from 5812 * {@link android.view.KeyEvent}. 5813 * @param event The KeyEvent object that defines the button action. 5814 */ 5815 public boolean onKeyUp(int keyCode, KeyEvent event) { 5816 boolean result = false; 5817 5818 switch (keyCode) { 5819 case KeyEvent.KEYCODE_DPAD_CENTER: 5820 case KeyEvent.KEYCODE_ENTER: { 5821 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5822 return true; 5823 } 5824 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 5825 setPressed(false); 5826 5827 if (!mHasPerformedLongPress) { 5828 // This is a tap, so remove the longpress check 5829 removeLongPressCallback(); 5830 5831 result = performClick(); 5832 } 5833 } 5834 break; 5835 } 5836 } 5837 return result; 5838 } 5839 5840 /** 5841 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 5842 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 5843 * the event). 5844 * 5845 * @param keyCode A key code that represents the button pressed, from 5846 * {@link android.view.KeyEvent}. 5847 * @param repeatCount The number of times the action was made. 5848 * @param event The KeyEvent object that defines the button action. 5849 */ 5850 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 5851 return false; 5852 } 5853 5854 /** 5855 * Called on the focused view when a key shortcut event is not handled. 5856 * Override this method to implement local key shortcuts for the View. 5857 * Key shortcuts can also be implemented by setting the 5858 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 5859 * 5860 * @param keyCode The value in event.getKeyCode(). 5861 * @param event Description of the key event. 5862 * @return If you handled the event, return true. If you want to allow the 5863 * event to be handled by the next receiver, return false. 5864 */ 5865 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 5866 return false; 5867 } 5868 5869 /** 5870 * Check whether the called view is a text editor, in which case it 5871 * would make sense to automatically display a soft input window for 5872 * it. Subclasses should override this if they implement 5873 * {@link #onCreateInputConnection(EditorInfo)} to return true if 5874 * a call on that method would return a non-null InputConnection, and 5875 * they are really a first-class editor that the user would normally 5876 * start typing on when the go into a window containing your view. 5877 * 5878 * <p>The default implementation always returns false. This does 5879 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 5880 * will not be called or the user can not otherwise perform edits on your 5881 * view; it is just a hint to the system that this is not the primary 5882 * purpose of this view. 5883 * 5884 * @return Returns true if this view is a text editor, else false. 5885 */ 5886 public boolean onCheckIsTextEditor() { 5887 return false; 5888 } 5889 5890 /** 5891 * Create a new InputConnection for an InputMethod to interact 5892 * with the view. The default implementation returns null, since it doesn't 5893 * support input methods. You can override this to implement such support. 5894 * This is only needed for views that take focus and text input. 5895 * 5896 * <p>When implementing this, you probably also want to implement 5897 * {@link #onCheckIsTextEditor()} to indicate you will return a 5898 * non-null InputConnection. 5899 * 5900 * @param outAttrs Fill in with attribute information about the connection. 5901 */ 5902 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 5903 return null; 5904 } 5905 5906 /** 5907 * Called by the {@link android.view.inputmethod.InputMethodManager} 5908 * when a view who is not the current 5909 * input connection target is trying to make a call on the manager. The 5910 * default implementation returns false; you can override this to return 5911 * true for certain views if you are performing InputConnection proxying 5912 * to them. 5913 * @param view The View that is making the InputMethodManager call. 5914 * @return Return true to allow the call, false to reject. 5915 */ 5916 public boolean checkInputConnectionProxy(View view) { 5917 return false; 5918 } 5919 5920 /** 5921 * Show the context menu for this view. It is not safe to hold on to the 5922 * menu after returning from this method. 5923 * 5924 * You should normally not overload this method. Overload 5925 * {@link #onCreateContextMenu(ContextMenu)} or define an 5926 * {@link OnCreateContextMenuListener} to add items to the context menu. 5927 * 5928 * @param menu The context menu to populate 5929 */ 5930 public void createContextMenu(ContextMenu menu) { 5931 ContextMenuInfo menuInfo = getContextMenuInfo(); 5932 5933 // Sets the current menu info so all items added to menu will have 5934 // my extra info set. 5935 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 5936 5937 onCreateContextMenu(menu); 5938 if (mOnCreateContextMenuListener != null) { 5939 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 5940 } 5941 5942 // Clear the extra information so subsequent items that aren't mine don't 5943 // have my extra info. 5944 ((MenuBuilder)menu).setCurrentMenuInfo(null); 5945 5946 if (mParent != null) { 5947 mParent.createContextMenu(menu); 5948 } 5949 } 5950 5951 /** 5952 * Views should implement this if they have extra information to associate 5953 * with the context menu. The return result is supplied as a parameter to 5954 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 5955 * callback. 5956 * 5957 * @return Extra information about the item for which the context menu 5958 * should be shown. This information will vary across different 5959 * subclasses of View. 5960 */ 5961 protected ContextMenuInfo getContextMenuInfo() { 5962 return null; 5963 } 5964 5965 /** 5966 * Views should implement this if the view itself is going to add items to 5967 * the context menu. 5968 * 5969 * @param menu the context menu to populate 5970 */ 5971 protected void onCreateContextMenu(ContextMenu menu) { 5972 } 5973 5974 /** 5975 * Implement this method to handle trackball motion events. The 5976 * <em>relative</em> movement of the trackball since the last event 5977 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 5978 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 5979 * that a movement of 1 corresponds to the user pressing one DPAD key (so 5980 * they will often be fractional values, representing the more fine-grained 5981 * movement information available from a trackball). 5982 * 5983 * @param event The motion event. 5984 * @return True if the event was handled, false otherwise. 5985 */ 5986 public boolean onTrackballEvent(MotionEvent event) { 5987 return false; 5988 } 5989 5990 /** 5991 * Implement this method to handle generic motion events. 5992 * <p> 5993 * Generic motion events describe joystick movements, mouse hovers, track pad 5994 * touches, scroll wheel movements and other input events. The 5995 * {@link MotionEvent#getSource() source} of the motion event specifies 5996 * the class of input that was received. Implementations of this method 5997 * must examine the bits in the source before processing the event. 5998 * The following code example shows how this is done. 5999 * </p><p> 6000 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6001 * are delivered to the view under the pointer. All other generic motion events are 6002 * delivered to the focused view. 6003 * </p> 6004 * <code> 6005 * public boolean onGenericMotionEvent(MotionEvent event) { 6006 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 6007 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 6008 * // process the joystick movement... 6009 * return true; 6010 * } 6011 * } 6012 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6013 * switch (event.getAction()) { 6014 * case MotionEvent.ACTION_HOVER_MOVE: 6015 * // process the mouse hover movement... 6016 * return true; 6017 * case MotionEvent.ACTION_SCROLL: 6018 * // process the scroll wheel movement... 6019 * return true; 6020 * } 6021 * } 6022 * return super.onGenericMotionEvent(event); 6023 * } 6024 * </code> 6025 * 6026 * @param event The generic motion event being processed. 6027 * @return True if the event was handled, false otherwise. 6028 */ 6029 public boolean onGenericMotionEvent(MotionEvent event) { 6030 return false; 6031 } 6032 6033 /** 6034 * Implement this method to handle hover events. 6035 * <p> 6036 * This method is called whenever a pointer is hovering into, over, or out of the 6037 * bounds of a view and the view is not currently being touched. 6038 * Hover events are represented as pointer events with action 6039 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 6040 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 6041 * </p> 6042 * <ul> 6043 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 6044 * when the pointer enters the bounds of the view.</li> 6045 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 6046 * when the pointer has already entered the bounds of the view and has moved.</li> 6047 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 6048 * when the pointer has exited the bounds of the view or when the pointer is 6049 * about to go down due to a button click, tap, or similar user action that 6050 * causes the view to be touched.</li> 6051 * </ul> 6052 * <p> 6053 * The view should implement this method to return true to indicate that it is 6054 * handling the hover event, such as by changing its drawable state. 6055 * </p><p> 6056 * The default implementation calls {@link #setHovered} to update the hovered state 6057 * of the view when a hover enter or hover exit event is received, if the view 6058 * is enabled and is clickable. 6059 * </p> 6060 * 6061 * @param event The motion event that describes the hover. 6062 * @return True if the view handled the hover event. 6063 * 6064 * @see #isHovered 6065 * @see #setHovered 6066 * @see #onHoverChanged 6067 */ 6068 public boolean onHoverEvent(MotionEvent event) { 6069 if (isHoverable()) { 6070 switch (event.getAction()) { 6071 case MotionEvent.ACTION_HOVER_ENTER: 6072 setHovered(true); 6073 break; 6074 case MotionEvent.ACTION_HOVER_EXIT: 6075 setHovered(false); 6076 break; 6077 } 6078 return true; 6079 } 6080 return false; 6081 } 6082 6083 /** 6084 * Returns true if the view should handle {@link #onHoverEvent} 6085 * by calling {@link #setHovered} to change its hovered state. 6086 * 6087 * @return True if the view is hoverable. 6088 */ 6089 private boolean isHoverable() { 6090 final int viewFlags = mViewFlags; 6091 //noinspection SimplifiableIfStatement 6092 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6093 return false; 6094 } 6095 6096 return (viewFlags & CLICKABLE) == CLICKABLE 6097 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6098 } 6099 6100 /** 6101 * Returns true if the view is currently hovered. 6102 * 6103 * @return True if the view is currently hovered. 6104 * 6105 * @see #setHovered 6106 * @see #onHoverChanged 6107 */ 6108 @ViewDebug.ExportedProperty 6109 public boolean isHovered() { 6110 return (mPrivateFlags & HOVERED) != 0; 6111 } 6112 6113 /** 6114 * Sets whether the view is currently hovered. 6115 * <p> 6116 * Calling this method also changes the drawable state of the view. This 6117 * enables the view to react to hover by using different drawable resources 6118 * to change its appearance. 6119 * </p><p> 6120 * The {@link #onHoverChanged} method is called when the hovered state changes. 6121 * </p> 6122 * 6123 * @param hovered True if the view is hovered. 6124 * 6125 * @see #isHovered 6126 * @see #onHoverChanged 6127 */ 6128 public void setHovered(boolean hovered) { 6129 if (hovered) { 6130 if ((mPrivateFlags & HOVERED) == 0) { 6131 mPrivateFlags |= HOVERED; 6132 refreshDrawableState(); 6133 onHoverChanged(true); 6134 } 6135 } else { 6136 if ((mPrivateFlags & HOVERED) != 0) { 6137 mPrivateFlags &= ~HOVERED; 6138 refreshDrawableState(); 6139 onHoverChanged(false); 6140 } 6141 } 6142 } 6143 6144 /** 6145 * Implement this method to handle hover state changes. 6146 * <p> 6147 * This method is called whenever the hover state changes as a result of a 6148 * call to {@link #setHovered}. 6149 * </p> 6150 * 6151 * @param hovered The current hover state, as returned by {@link #isHovered}. 6152 * 6153 * @see #isHovered 6154 * @see #setHovered 6155 */ 6156 public void onHoverChanged(boolean hovered) { 6157 } 6158 6159 /** 6160 * Implement this method to handle touch screen motion events. 6161 * 6162 * @param event The motion event. 6163 * @return True if the event was handled, false otherwise. 6164 */ 6165 public boolean onTouchEvent(MotionEvent event) { 6166 final int viewFlags = mViewFlags; 6167 6168 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6169 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 6170 mPrivateFlags &= ~PRESSED; 6171 refreshDrawableState(); 6172 } 6173 // A disabled view that is clickable still consumes the touch 6174 // events, it just doesn't respond to them. 6175 return (((viewFlags & CLICKABLE) == CLICKABLE || 6176 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 6177 } 6178 6179 if (mTouchDelegate != null) { 6180 if (mTouchDelegate.onTouchEvent(event)) { 6181 return true; 6182 } 6183 } 6184 6185 if (((viewFlags & CLICKABLE) == CLICKABLE || 6186 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 6187 switch (event.getAction()) { 6188 case MotionEvent.ACTION_UP: 6189 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 6190 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 6191 // take focus if we don't have it already and we should in 6192 // touch mode. 6193 boolean focusTaken = false; 6194 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 6195 focusTaken = requestFocus(); 6196 } 6197 6198 if (prepressed) { 6199 // The button is being released before we actually 6200 // showed it as pressed. Make it show the pressed 6201 // state now (before scheduling the click) to ensure 6202 // the user sees it. 6203 mPrivateFlags |= PRESSED; 6204 refreshDrawableState(); 6205 } 6206 6207 if (!mHasPerformedLongPress) { 6208 // This is a tap, so remove the longpress check 6209 removeLongPressCallback(); 6210 6211 // Only perform take click actions if we were in the pressed state 6212 if (!focusTaken) { 6213 // Use a Runnable and post this rather than calling 6214 // performClick directly. This lets other visual state 6215 // of the view update before click actions start. 6216 if (mPerformClick == null) { 6217 mPerformClick = new PerformClick(); 6218 } 6219 if (!post(mPerformClick)) { 6220 performClick(); 6221 } 6222 } 6223 } 6224 6225 if (mUnsetPressedState == null) { 6226 mUnsetPressedState = new UnsetPressedState(); 6227 } 6228 6229 if (prepressed) { 6230 postDelayed(mUnsetPressedState, 6231 ViewConfiguration.getPressedStateDuration()); 6232 } else if (!post(mUnsetPressedState)) { 6233 // If the post failed, unpress right now 6234 mUnsetPressedState.run(); 6235 } 6236 removeTapCallback(); 6237 } 6238 break; 6239 6240 case MotionEvent.ACTION_DOWN: 6241 mHasPerformedLongPress = false; 6242 6243 if (performButtonActionOnTouchDown(event)) { 6244 break; 6245 } 6246 6247 // Walk up the hierarchy to determine if we're inside a scrolling container. 6248 boolean isInScrollingContainer = false; 6249 ViewParent p = getParent(); 6250 while (p != null && p instanceof ViewGroup) { 6251 if (((ViewGroup) p).shouldDelayChildPressedState()) { 6252 isInScrollingContainer = true; 6253 break; 6254 } 6255 p = p.getParent(); 6256 } 6257 6258 // For views inside a scrolling container, delay the pressed feedback for 6259 // a short period in case this is a scroll. 6260 if (isInScrollingContainer) { 6261 mPrivateFlags |= PREPRESSED; 6262 if (mPendingCheckForTap == null) { 6263 mPendingCheckForTap = new CheckForTap(); 6264 } 6265 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 6266 } else { 6267 // Not inside a scrolling container, so show the feedback right away 6268 mPrivateFlags |= PRESSED; 6269 refreshDrawableState(); 6270 checkForLongClick(0); 6271 } 6272 break; 6273 6274 case MotionEvent.ACTION_CANCEL: 6275 mPrivateFlags &= ~PRESSED; 6276 refreshDrawableState(); 6277 removeTapCallback(); 6278 break; 6279 6280 case MotionEvent.ACTION_MOVE: 6281 final int x = (int) event.getX(); 6282 final int y = (int) event.getY(); 6283 6284 // Be lenient about moving outside of buttons 6285 if (!pointInView(x, y, mTouchSlop)) { 6286 // Outside button 6287 removeTapCallback(); 6288 if ((mPrivateFlags & PRESSED) != 0) { 6289 // Remove any future long press/tap checks 6290 removeLongPressCallback(); 6291 6292 // Need to switch from pressed to not pressed 6293 mPrivateFlags &= ~PRESSED; 6294 refreshDrawableState(); 6295 } 6296 } 6297 break; 6298 } 6299 return true; 6300 } 6301 6302 return false; 6303 } 6304 6305 /** 6306 * Remove the longpress detection timer. 6307 */ 6308 private void removeLongPressCallback() { 6309 if (mPendingCheckForLongPress != null) { 6310 removeCallbacks(mPendingCheckForLongPress); 6311 } 6312 } 6313 6314 /** 6315 * Remove the pending click action 6316 */ 6317 private void removePerformClickCallback() { 6318 if (mPerformClick != null) { 6319 removeCallbacks(mPerformClick); 6320 } 6321 } 6322 6323 /** 6324 * Remove the prepress detection timer. 6325 */ 6326 private void removeUnsetPressCallback() { 6327 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 6328 setPressed(false); 6329 removeCallbacks(mUnsetPressedState); 6330 } 6331 } 6332 6333 /** 6334 * Remove the tap detection timer. 6335 */ 6336 private void removeTapCallback() { 6337 if (mPendingCheckForTap != null) { 6338 mPrivateFlags &= ~PREPRESSED; 6339 removeCallbacks(mPendingCheckForTap); 6340 } 6341 } 6342 6343 /** 6344 * Cancels a pending long press. Your subclass can use this if you 6345 * want the context menu to come up if the user presses and holds 6346 * at the same place, but you don't want it to come up if they press 6347 * and then move around enough to cause scrolling. 6348 */ 6349 public void cancelLongPress() { 6350 removeLongPressCallback(); 6351 6352 /* 6353 * The prepressed state handled by the tap callback is a display 6354 * construct, but the tap callback will post a long press callback 6355 * less its own timeout. Remove it here. 6356 */ 6357 removeTapCallback(); 6358 } 6359 6360 /** 6361 * Remove the pending callback for sending a 6362 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 6363 */ 6364 private void removeSendViewScrolledAccessibilityEventCallback() { 6365 if (mSendViewScrolledAccessibilityEvent != null) { 6366 removeCallbacks(mSendViewScrolledAccessibilityEvent); 6367 } 6368 } 6369 6370 /** 6371 * Sets the TouchDelegate for this View. 6372 */ 6373 public void setTouchDelegate(TouchDelegate delegate) { 6374 mTouchDelegate = delegate; 6375 } 6376 6377 /** 6378 * Gets the TouchDelegate for this View. 6379 */ 6380 public TouchDelegate getTouchDelegate() { 6381 return mTouchDelegate; 6382 } 6383 6384 /** 6385 * Set flags controlling behavior of this view. 6386 * 6387 * @param flags Constant indicating the value which should be set 6388 * @param mask Constant indicating the bit range that should be changed 6389 */ 6390 void setFlags(int flags, int mask) { 6391 int old = mViewFlags; 6392 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6393 6394 int changed = mViewFlags ^ old; 6395 if (changed == 0) { 6396 return; 6397 } 6398 int privateFlags = mPrivateFlags; 6399 6400 /* Check if the FOCUSABLE bit has changed */ 6401 if (((changed & FOCUSABLE_MASK) != 0) && 6402 ((privateFlags & HAS_BOUNDS) !=0)) { 6403 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6404 && ((privateFlags & FOCUSED) != 0)) { 6405 /* Give up focus if we are no longer focusable */ 6406 clearFocus(); 6407 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6408 && ((privateFlags & FOCUSED) == 0)) { 6409 /* 6410 * Tell the view system that we are now available to take focus 6411 * if no one else already has it. 6412 */ 6413 if (mParent != null) mParent.focusableViewAvailable(this); 6414 } 6415 } 6416 6417 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6418 if ((changed & VISIBILITY_MASK) != 0) { 6419 /* 6420 * If this view is becoming visible, set the DRAWN flag so that 6421 * the next invalidate() will not be skipped. 6422 */ 6423 mPrivateFlags |= DRAWN; 6424 6425 needGlobalAttributesUpdate(true); 6426 6427 // a view becoming visible is worth notifying the parent 6428 // about in case nothing has focus. even if this specific view 6429 // isn't focusable, it may contain something that is, so let 6430 // the root view try to give this focus if nothing else does. 6431 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6432 mParent.focusableViewAvailable(this); 6433 } 6434 } 6435 } 6436 6437 /* Check if the GONE bit has changed */ 6438 if ((changed & GONE) != 0) { 6439 needGlobalAttributesUpdate(false); 6440 requestLayout(); 6441 invalidate(true); 6442 6443 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6444 if (hasFocus()) clearFocus(); 6445 destroyDrawingCache(); 6446 } 6447 if (mAttachInfo != null) { 6448 mAttachInfo.mViewVisibilityChanged = true; 6449 } 6450 } 6451 6452 /* Check if the VISIBLE bit has changed */ 6453 if ((changed & INVISIBLE) != 0) { 6454 needGlobalAttributesUpdate(false); 6455 /* 6456 * If this view is becoming invisible, set the DRAWN flag so that 6457 * the next invalidate() will not be skipped. 6458 */ 6459 mPrivateFlags |= DRAWN; 6460 6461 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6462 // root view becoming invisible shouldn't clear focus 6463 if (getRootView() != this) { 6464 clearFocus(); 6465 } 6466 } 6467 if (mAttachInfo != null) { 6468 mAttachInfo.mViewVisibilityChanged = true; 6469 } 6470 } 6471 6472 if ((changed & VISIBILITY_MASK) != 0) { 6473 if (mParent instanceof ViewGroup) { 6474 ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6475 ((View) mParent).invalidate(true); 6476 } 6477 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6478 } 6479 6480 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6481 destroyDrawingCache(); 6482 } 6483 6484 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6485 destroyDrawingCache(); 6486 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6487 invalidateParentCaches(); 6488 } 6489 6490 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6491 destroyDrawingCache(); 6492 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6493 } 6494 6495 if ((changed & DRAW_MASK) != 0) { 6496 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6497 if (mBGDrawable != null) { 6498 mPrivateFlags &= ~SKIP_DRAW; 6499 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6500 } else { 6501 mPrivateFlags |= SKIP_DRAW; 6502 } 6503 } else { 6504 mPrivateFlags &= ~SKIP_DRAW; 6505 } 6506 requestLayout(); 6507 invalidate(true); 6508 } 6509 6510 if ((changed & KEEP_SCREEN_ON) != 0) { 6511 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6512 mParent.recomputeViewAttributes(this); 6513 } 6514 } 6515 6516 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6517 requestLayout(); 6518 } 6519 } 6520 6521 /** 6522 * Change the view's z order in the tree, so it's on top of other sibling 6523 * views 6524 */ 6525 public void bringToFront() { 6526 if (mParent != null) { 6527 mParent.bringChildToFront(this); 6528 } 6529 } 6530 6531 /** 6532 * This is called in response to an internal scroll in this view (i.e., the 6533 * view scrolled its own contents). This is typically as a result of 6534 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6535 * called. 6536 * 6537 * @param l Current horizontal scroll origin. 6538 * @param t Current vertical scroll origin. 6539 * @param oldl Previous horizontal scroll origin. 6540 * @param oldt Previous vertical scroll origin. 6541 */ 6542 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6543 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 6544 postSendViewScrolledAccessibilityEventCallback(); 6545 } 6546 6547 mBackgroundSizeChanged = true; 6548 6549 final AttachInfo ai = mAttachInfo; 6550 if (ai != null) { 6551 ai.mViewScrollChanged = true; 6552 } 6553 } 6554 6555 /** 6556 * Interface definition for a callback to be invoked when the layout bounds of a view 6557 * changes due to layout processing. 6558 */ 6559 public interface OnLayoutChangeListener { 6560 /** 6561 * Called when the focus state of a view has changed. 6562 * 6563 * @param v The view whose state has changed. 6564 * @param left The new value of the view's left property. 6565 * @param top The new value of the view's top property. 6566 * @param right The new value of the view's right property. 6567 * @param bottom The new value of the view's bottom property. 6568 * @param oldLeft The previous value of the view's left property. 6569 * @param oldTop The previous value of the view's top property. 6570 * @param oldRight The previous value of the view's right property. 6571 * @param oldBottom The previous value of the view's bottom property. 6572 */ 6573 void onLayoutChange(View v, int left, int top, int right, int bottom, 6574 int oldLeft, int oldTop, int oldRight, int oldBottom); 6575 } 6576 6577 /** 6578 * This is called during layout when the size of this view has changed. If 6579 * you were just added to the view hierarchy, you're called with the old 6580 * values of 0. 6581 * 6582 * @param w Current width of this view. 6583 * @param h Current height of this view. 6584 * @param oldw Old width of this view. 6585 * @param oldh Old height of this view. 6586 */ 6587 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 6588 } 6589 6590 /** 6591 * Called by draw to draw the child views. This may be overridden 6592 * by derived classes to gain control just before its children are drawn 6593 * (but after its own view has been drawn). 6594 * @param canvas the canvas on which to draw the view 6595 */ 6596 protected void dispatchDraw(Canvas canvas) { 6597 } 6598 6599 /** 6600 * Gets the parent of this view. Note that the parent is a 6601 * ViewParent and not necessarily a View. 6602 * 6603 * @return Parent of this view. 6604 */ 6605 public final ViewParent getParent() { 6606 return mParent; 6607 } 6608 6609 /** 6610 * Set the horizontal scrolled position of your view. This will cause a call to 6611 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6612 * invalidated. 6613 * @param value the x position to scroll to 6614 */ 6615 public void setScrollX(int value) { 6616 scrollTo(value, mScrollY); 6617 } 6618 6619 /** 6620 * Set the vertical scrolled position of your view. This will cause a call to 6621 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6622 * invalidated. 6623 * @param value the y position to scroll to 6624 */ 6625 public void setScrollY(int value) { 6626 scrollTo(mScrollX, value); 6627 } 6628 6629 /** 6630 * Return the scrolled left position of this view. This is the left edge of 6631 * the displayed part of your view. You do not need to draw any pixels 6632 * farther left, since those are outside of the frame of your view on 6633 * screen. 6634 * 6635 * @return The left edge of the displayed part of your view, in pixels. 6636 */ 6637 public final int getScrollX() { 6638 return mScrollX; 6639 } 6640 6641 /** 6642 * Return the scrolled top position of this view. This is the top edge of 6643 * the displayed part of your view. You do not need to draw any pixels above 6644 * it, since those are outside of the frame of your view on screen. 6645 * 6646 * @return The top edge of the displayed part of your view, in pixels. 6647 */ 6648 public final int getScrollY() { 6649 return mScrollY; 6650 } 6651 6652 /** 6653 * Return the width of the your view. 6654 * 6655 * @return The width of your view, in pixels. 6656 */ 6657 @ViewDebug.ExportedProperty(category = "layout") 6658 public final int getWidth() { 6659 return mRight - mLeft; 6660 } 6661 6662 /** 6663 * Return the height of your view. 6664 * 6665 * @return The height of your view, in pixels. 6666 */ 6667 @ViewDebug.ExportedProperty(category = "layout") 6668 public final int getHeight() { 6669 return mBottom - mTop; 6670 } 6671 6672 /** 6673 * Return the visible drawing bounds of your view. Fills in the output 6674 * rectangle with the values from getScrollX(), getScrollY(), 6675 * getWidth(), and getHeight(). 6676 * 6677 * @param outRect The (scrolled) drawing bounds of the view. 6678 */ 6679 public void getDrawingRect(Rect outRect) { 6680 outRect.left = mScrollX; 6681 outRect.top = mScrollY; 6682 outRect.right = mScrollX + (mRight - mLeft); 6683 outRect.bottom = mScrollY + (mBottom - mTop); 6684 } 6685 6686 /** 6687 * Like {@link #getMeasuredWidthAndState()}, but only returns the 6688 * raw width component (that is the result is masked by 6689 * {@link #MEASURED_SIZE_MASK}). 6690 * 6691 * @return The raw measured width of this view. 6692 */ 6693 public final int getMeasuredWidth() { 6694 return mMeasuredWidth & MEASURED_SIZE_MASK; 6695 } 6696 6697 /** 6698 * Return the full width measurement information for this view as computed 6699 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6700 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6701 * This should be used during measurement and layout calculations only. Use 6702 * {@link #getWidth()} to see how wide a view is after layout. 6703 * 6704 * @return The measured width of this view as a bit mask. 6705 */ 6706 public final int getMeasuredWidthAndState() { 6707 return mMeasuredWidth; 6708 } 6709 6710 /** 6711 * Like {@link #getMeasuredHeightAndState()}, but only returns the 6712 * raw width component (that is the result is masked by 6713 * {@link #MEASURED_SIZE_MASK}). 6714 * 6715 * @return The raw measured height of this view. 6716 */ 6717 public final int getMeasuredHeight() { 6718 return mMeasuredHeight & MEASURED_SIZE_MASK; 6719 } 6720 6721 /** 6722 * Return the full height measurement information for this view as computed 6723 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6724 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6725 * This should be used during measurement and layout calculations only. Use 6726 * {@link #getHeight()} to see how wide a view is after layout. 6727 * 6728 * @return The measured width of this view as a bit mask. 6729 */ 6730 public final int getMeasuredHeightAndState() { 6731 return mMeasuredHeight; 6732 } 6733 6734 /** 6735 * Return only the state bits of {@link #getMeasuredWidthAndState()} 6736 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 6737 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 6738 * and the height component is at the shifted bits 6739 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 6740 */ 6741 public final int getMeasuredState() { 6742 return (mMeasuredWidth&MEASURED_STATE_MASK) 6743 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 6744 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 6745 } 6746 6747 /** 6748 * The transform matrix of this view, which is calculated based on the current 6749 * roation, scale, and pivot properties. 6750 * 6751 * @see #getRotation() 6752 * @see #getScaleX() 6753 * @see #getScaleY() 6754 * @see #getPivotX() 6755 * @see #getPivotY() 6756 * @return The current transform matrix for the view 6757 */ 6758 public Matrix getMatrix() { 6759 updateMatrix(); 6760 return mMatrix; 6761 } 6762 6763 /** 6764 * Utility function to determine if the value is far enough away from zero to be 6765 * considered non-zero. 6766 * @param value A floating point value to check for zero-ness 6767 * @return whether the passed-in value is far enough away from zero to be considered non-zero 6768 */ 6769 private static boolean nonzero(float value) { 6770 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 6771 } 6772 6773 /** 6774 * Returns true if the transform matrix is the identity matrix. 6775 * Recomputes the matrix if necessary. 6776 * 6777 * @return True if the transform matrix is the identity matrix, false otherwise. 6778 */ 6779 final boolean hasIdentityMatrix() { 6780 updateMatrix(); 6781 return mMatrixIsIdentity; 6782 } 6783 6784 /** 6785 * Recomputes the transform matrix if necessary. 6786 */ 6787 private void updateMatrix() { 6788 if (mMatrixDirty) { 6789 // transform-related properties have changed since the last time someone 6790 // asked for the matrix; recalculate it with the current values 6791 6792 // Figure out if we need to update the pivot point 6793 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6794 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 6795 mPrevWidth = mRight - mLeft; 6796 mPrevHeight = mBottom - mTop; 6797 mPivotX = mPrevWidth / 2f; 6798 mPivotY = mPrevHeight / 2f; 6799 } 6800 } 6801 mMatrix.reset(); 6802 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 6803 mMatrix.setTranslate(mTranslationX, mTranslationY); 6804 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 6805 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6806 } else { 6807 if (mCamera == null) { 6808 mCamera = new Camera(); 6809 matrix3D = new Matrix(); 6810 } 6811 mCamera.save(); 6812 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6813 mCamera.rotate(mRotationX, mRotationY, -mRotation); 6814 mCamera.getMatrix(matrix3D); 6815 matrix3D.preTranslate(-mPivotX, -mPivotY); 6816 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 6817 mMatrix.postConcat(matrix3D); 6818 mCamera.restore(); 6819 } 6820 mMatrixDirty = false; 6821 mMatrixIsIdentity = mMatrix.isIdentity(); 6822 mInverseMatrixDirty = true; 6823 } 6824 } 6825 6826 /** 6827 * Utility method to retrieve the inverse of the current mMatrix property. 6828 * We cache the matrix to avoid recalculating it when transform properties 6829 * have not changed. 6830 * 6831 * @return The inverse of the current matrix of this view. 6832 */ 6833 final Matrix getInverseMatrix() { 6834 updateMatrix(); 6835 if (mInverseMatrixDirty) { 6836 if (mInverseMatrix == null) { 6837 mInverseMatrix = new Matrix(); 6838 } 6839 mMatrix.invert(mInverseMatrix); 6840 mInverseMatrixDirty = false; 6841 } 6842 return mInverseMatrix; 6843 } 6844 6845 /** 6846 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 6847 * views are drawn) from the camera to this view. The camera's distance 6848 * affects 3D transformations, for instance rotations around the X and Y 6849 * axis. If the rotationX or rotationY properties are changed and this view is 6850 * large (more than half the size of the screen), it is recommended to always 6851 * use a camera distance that's greater than the height (X axis rotation) or 6852 * the width (Y axis rotation) of this view.</p> 6853 * 6854 * <p>The distance of the camera from the view plane can have an affect on the 6855 * perspective distortion of the view when it is rotated around the x or y axis. 6856 * For example, a large distance will result in a large viewing angle, and there 6857 * will not be much perspective distortion of the view as it rotates. A short 6858 * distance may cause much more perspective distortion upon rotation, and can 6859 * also result in some drawing artifacts if the rotated view ends up partially 6860 * behind the camera (which is why the recommendation is to use a distance at 6861 * least as far as the size of the view, if the view is to be rotated.)</p> 6862 * 6863 * <p>The distance is expressed in "depth pixels." The default distance depends 6864 * on the screen density. For instance, on a medium density display, the 6865 * default distance is 1280. On a high density display, the default distance 6866 * is 1920.</p> 6867 * 6868 * <p>If you want to specify a distance that leads to visually consistent 6869 * results across various densities, use the following formula:</p> 6870 * <pre> 6871 * float scale = context.getResources().getDisplayMetrics().density; 6872 * view.setCameraDistance(distance * scale); 6873 * </pre> 6874 * 6875 * <p>The density scale factor of a high density display is 1.5, 6876 * and 1920 = 1280 * 1.5.</p> 6877 * 6878 * @param distance The distance in "depth pixels", if negative the opposite 6879 * value is used 6880 * 6881 * @see #setRotationX(float) 6882 * @see #setRotationY(float) 6883 */ 6884 public void setCameraDistance(float distance) { 6885 invalidateParentCaches(); 6886 invalidate(false); 6887 6888 final float dpi = mResources.getDisplayMetrics().densityDpi; 6889 if (mCamera == null) { 6890 mCamera = new Camera(); 6891 matrix3D = new Matrix(); 6892 } 6893 6894 mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 6895 mMatrixDirty = true; 6896 6897 invalidate(false); 6898 } 6899 6900 /** 6901 * The degrees that the view is rotated around the pivot point. 6902 * 6903 * @see #setRotation(float) 6904 * @see #getPivotX() 6905 * @see #getPivotY() 6906 * 6907 * @return The degrees of rotation. 6908 */ 6909 public float getRotation() { 6910 return mRotation; 6911 } 6912 6913 /** 6914 * Sets the degrees that the view is rotated around the pivot point. Increasing values 6915 * result in clockwise rotation. 6916 * 6917 * @param rotation The degrees of rotation. 6918 * 6919 * @see #getRotation() 6920 * @see #getPivotX() 6921 * @see #getPivotY() 6922 * @see #setRotationX(float) 6923 * @see #setRotationY(float) 6924 * 6925 * @attr ref android.R.styleable#View_rotation 6926 */ 6927 public void setRotation(float rotation) { 6928 if (mRotation != rotation) { 6929 invalidateParentCaches(); 6930 // Double-invalidation is necessary to capture view's old and new areas 6931 invalidate(false); 6932 mRotation = rotation; 6933 mMatrixDirty = true; 6934 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6935 invalidate(false); 6936 } 6937 } 6938 6939 /** 6940 * The degrees that the view is rotated around the vertical axis through the pivot point. 6941 * 6942 * @see #getPivotX() 6943 * @see #getPivotY() 6944 * @see #setRotationY(float) 6945 * 6946 * @return The degrees of Y rotation. 6947 */ 6948 public float getRotationY() { 6949 return mRotationY; 6950 } 6951 6952 /** 6953 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 6954 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 6955 * down the y axis. 6956 * 6957 * When rotating large views, it is recommended to adjust the camera distance 6958 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 6959 * 6960 * @param rotationY The degrees of Y rotation. 6961 * 6962 * @see #getRotationY() 6963 * @see #getPivotX() 6964 * @see #getPivotY() 6965 * @see #setRotation(float) 6966 * @see #setRotationX(float) 6967 * @see #setCameraDistance(float) 6968 * 6969 * @attr ref android.R.styleable#View_rotationY 6970 */ 6971 public void setRotationY(float rotationY) { 6972 if (mRotationY != rotationY) { 6973 invalidateParentCaches(); 6974 // Double-invalidation is necessary to capture view's old and new areas 6975 invalidate(false); 6976 mRotationY = rotationY; 6977 mMatrixDirty = true; 6978 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6979 invalidate(false); 6980 } 6981 } 6982 6983 /** 6984 * The degrees that the view is rotated around the horizontal axis through the pivot point. 6985 * 6986 * @see #getPivotX() 6987 * @see #getPivotY() 6988 * @see #setRotationX(float) 6989 * 6990 * @return The degrees of X rotation. 6991 */ 6992 public float getRotationX() { 6993 return mRotationX; 6994 } 6995 6996 /** 6997 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 6998 * Increasing values result in clockwise rotation from the viewpoint of looking down the 6999 * x axis. 7000 * 7001 * When rotating large views, it is recommended to adjust the camera distance 7002 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7003 * 7004 * @param rotationX The degrees of X rotation. 7005 * 7006 * @see #getRotationX() 7007 * @see #getPivotX() 7008 * @see #getPivotY() 7009 * @see #setRotation(float) 7010 * @see #setRotationY(float) 7011 * @see #setCameraDistance(float) 7012 * 7013 * @attr ref android.R.styleable#View_rotationX 7014 */ 7015 public void setRotationX(float rotationX) { 7016 if (mRotationX != rotationX) { 7017 invalidateParentCaches(); 7018 // Double-invalidation is necessary to capture view's old and new areas 7019 invalidate(false); 7020 mRotationX = rotationX; 7021 mMatrixDirty = true; 7022 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7023 invalidate(false); 7024 } 7025 } 7026 7027 /** 7028 * The amount that the view is scaled in x around the pivot point, as a proportion of 7029 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 7030 * 7031 * <p>By default, this is 1.0f. 7032 * 7033 * @see #getPivotX() 7034 * @see #getPivotY() 7035 * @return The scaling factor. 7036 */ 7037 public float getScaleX() { 7038 return mScaleX; 7039 } 7040 7041 /** 7042 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 7043 * the view's unscaled width. A value of 1 means that no scaling is applied. 7044 * 7045 * @param scaleX The scaling factor. 7046 * @see #getPivotX() 7047 * @see #getPivotY() 7048 * 7049 * @attr ref android.R.styleable#View_scaleX 7050 */ 7051 public void setScaleX(float scaleX) { 7052 if (mScaleX != scaleX) { 7053 invalidateParentCaches(); 7054 // Double-invalidation is necessary to capture view's old and new areas 7055 invalidate(false); 7056 mScaleX = scaleX; 7057 mMatrixDirty = true; 7058 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7059 invalidate(false); 7060 } 7061 } 7062 7063 /** 7064 * The amount that the view is scaled in y around the pivot point, as a proportion of 7065 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 7066 * 7067 * <p>By default, this is 1.0f. 7068 * 7069 * @see #getPivotX() 7070 * @see #getPivotY() 7071 * @return The scaling factor. 7072 */ 7073 public float getScaleY() { 7074 return mScaleY; 7075 } 7076 7077 /** 7078 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 7079 * the view's unscaled width. A value of 1 means that no scaling is applied. 7080 * 7081 * @param scaleY The scaling factor. 7082 * @see #getPivotX() 7083 * @see #getPivotY() 7084 * 7085 * @attr ref android.R.styleable#View_scaleY 7086 */ 7087 public void setScaleY(float scaleY) { 7088 if (mScaleY != scaleY) { 7089 invalidateParentCaches(); 7090 // Double-invalidation is necessary to capture view's old and new areas 7091 invalidate(false); 7092 mScaleY = scaleY; 7093 mMatrixDirty = true; 7094 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7095 invalidate(false); 7096 } 7097 } 7098 7099 /** 7100 * The x location of the point around which the view is {@link #setRotation(float) rotated} 7101 * and {@link #setScaleX(float) scaled}. 7102 * 7103 * @see #getRotation() 7104 * @see #getScaleX() 7105 * @see #getScaleY() 7106 * @see #getPivotY() 7107 * @return The x location of the pivot point. 7108 */ 7109 public float getPivotX() { 7110 return mPivotX; 7111 } 7112 7113 /** 7114 * Sets the x location of the point around which the view is 7115 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 7116 * By default, the pivot point is centered on the object. 7117 * Setting this property disables this behavior and causes the view to use only the 7118 * explicitly set pivotX and pivotY values. 7119 * 7120 * @param pivotX The x location of the pivot point. 7121 * @see #getRotation() 7122 * @see #getScaleX() 7123 * @see #getScaleY() 7124 * @see #getPivotY() 7125 * 7126 * @attr ref android.R.styleable#View_transformPivotX 7127 */ 7128 public void setPivotX(float pivotX) { 7129 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7130 if (mPivotX != pivotX) { 7131 invalidateParentCaches(); 7132 // Double-invalidation is necessary to capture view's old and new areas 7133 invalidate(false); 7134 mPivotX = pivotX; 7135 mMatrixDirty = true; 7136 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7137 invalidate(false); 7138 } 7139 } 7140 7141 /** 7142 * The y location of the point around which the view is {@link #setRotation(float) rotated} 7143 * and {@link #setScaleY(float) scaled}. 7144 * 7145 * @see #getRotation() 7146 * @see #getScaleX() 7147 * @see #getScaleY() 7148 * @see #getPivotY() 7149 * @return The y location of the pivot point. 7150 */ 7151 public float getPivotY() { 7152 return mPivotY; 7153 } 7154 7155 /** 7156 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 7157 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 7158 * Setting this property disables this behavior and causes the view to use only the 7159 * explicitly set pivotX and pivotY values. 7160 * 7161 * @param pivotY The y location of the pivot point. 7162 * @see #getRotation() 7163 * @see #getScaleX() 7164 * @see #getScaleY() 7165 * @see #getPivotY() 7166 * 7167 * @attr ref android.R.styleable#View_transformPivotY 7168 */ 7169 public void setPivotY(float pivotY) { 7170 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7171 if (mPivotY != pivotY) { 7172 invalidateParentCaches(); 7173 // Double-invalidation is necessary to capture view's old and new areas 7174 invalidate(false); 7175 mPivotY = pivotY; 7176 mMatrixDirty = true; 7177 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7178 invalidate(false); 7179 } 7180 } 7181 7182 /** 7183 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 7184 * completely transparent and 1 means the view is completely opaque. 7185 * 7186 * <p>By default this is 1.0f. 7187 * @return The opacity of the view. 7188 */ 7189 public float getAlpha() { 7190 return mAlpha; 7191 } 7192 7193 /** 7194 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 7195 * completely transparent and 1 means the view is completely opaque.</p> 7196 * 7197 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 7198 * responsible for applying the opacity itself. Otherwise, calling this method is 7199 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 7200 * setting a hardware layer.</p> 7201 * 7202 * @param alpha The opacity of the view. 7203 * 7204 * @see #setLayerType(int, android.graphics.Paint) 7205 * 7206 * @attr ref android.R.styleable#View_alpha 7207 */ 7208 public void setAlpha(float alpha) { 7209 mAlpha = alpha; 7210 invalidateParentCaches(); 7211 if (onSetAlpha((int) (alpha * 255))) { 7212 mPrivateFlags |= ALPHA_SET; 7213 // subclass is handling alpha - don't optimize rendering cache invalidation 7214 invalidate(true); 7215 } else { 7216 mPrivateFlags &= ~ALPHA_SET; 7217 invalidate(false); 7218 } 7219 } 7220 7221 /** 7222 * Faster version of setAlpha() which performs the same steps except there are 7223 * no calls to invalidate(). The caller of this function should perform proper invalidation 7224 * on the parent and this object. The return value indicates whether the subclass handles 7225 * alpha (the return value for onSetAlpha()). 7226 * 7227 * @param alpha The new value for the alpha property 7228 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) 7229 */ 7230 boolean setAlphaNoInvalidation(float alpha) { 7231 mAlpha = alpha; 7232 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 7233 if (subclassHandlesAlpha) { 7234 mPrivateFlags |= ALPHA_SET; 7235 } else { 7236 mPrivateFlags &= ~ALPHA_SET; 7237 } 7238 return subclassHandlesAlpha; 7239 } 7240 7241 /** 7242 * Top position of this view relative to its parent. 7243 * 7244 * @return The top of this view, in pixels. 7245 */ 7246 @ViewDebug.CapturedViewProperty 7247 public final int getTop() { 7248 return mTop; 7249 } 7250 7251 /** 7252 * Sets the top position of this view relative to its parent. This method is meant to be called 7253 * by the layout system and should not generally be called otherwise, because the property 7254 * may be changed at any time by the layout. 7255 * 7256 * @param top The top of this view, in pixels. 7257 */ 7258 public final void setTop(int top) { 7259 if (top != mTop) { 7260 updateMatrix(); 7261 if (mMatrixIsIdentity) { 7262 if (mAttachInfo != null) { 7263 int minTop; 7264 int yLoc; 7265 if (top < mTop) { 7266 minTop = top; 7267 yLoc = top - mTop; 7268 } else { 7269 minTop = mTop; 7270 yLoc = 0; 7271 } 7272 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 7273 } 7274 } else { 7275 // Double-invalidation is necessary to capture view's old and new areas 7276 invalidate(true); 7277 } 7278 7279 int width = mRight - mLeft; 7280 int oldHeight = mBottom - mTop; 7281 7282 mTop = top; 7283 7284 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7285 7286 if (!mMatrixIsIdentity) { 7287 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7288 // A change in dimension means an auto-centered pivot point changes, too 7289 mMatrixDirty = true; 7290 } 7291 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7292 invalidate(true); 7293 } 7294 mBackgroundSizeChanged = true; 7295 invalidateParentIfNeeded(); 7296 } 7297 } 7298 7299 /** 7300 * Bottom position of this view relative to its parent. 7301 * 7302 * @return The bottom of this view, in pixels. 7303 */ 7304 @ViewDebug.CapturedViewProperty 7305 public final int getBottom() { 7306 return mBottom; 7307 } 7308 7309 /** 7310 * True if this view has changed since the last time being drawn. 7311 * 7312 * @return The dirty state of this view. 7313 */ 7314 public boolean isDirty() { 7315 return (mPrivateFlags & DIRTY_MASK) != 0; 7316 } 7317 7318 /** 7319 * Sets the bottom position of this view relative to its parent. This method is meant to be 7320 * called by the layout system and should not generally be called otherwise, because the 7321 * property may be changed at any time by the layout. 7322 * 7323 * @param bottom The bottom of this view, in pixels. 7324 */ 7325 public final void setBottom(int bottom) { 7326 if (bottom != mBottom) { 7327 updateMatrix(); 7328 if (mMatrixIsIdentity) { 7329 if (mAttachInfo != null) { 7330 int maxBottom; 7331 if (bottom < mBottom) { 7332 maxBottom = mBottom; 7333 } else { 7334 maxBottom = bottom; 7335 } 7336 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 7337 } 7338 } else { 7339 // Double-invalidation is necessary to capture view's old and new areas 7340 invalidate(true); 7341 } 7342 7343 int width = mRight - mLeft; 7344 int oldHeight = mBottom - mTop; 7345 7346 mBottom = bottom; 7347 7348 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7349 7350 if (!mMatrixIsIdentity) { 7351 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7352 // A change in dimension means an auto-centered pivot point changes, too 7353 mMatrixDirty = true; 7354 } 7355 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7356 invalidate(true); 7357 } 7358 mBackgroundSizeChanged = true; 7359 invalidateParentIfNeeded(); 7360 } 7361 } 7362 7363 /** 7364 * Left position of this view relative to its parent. 7365 * 7366 * @return The left edge of this view, in pixels. 7367 */ 7368 @ViewDebug.CapturedViewProperty 7369 public final int getLeft() { 7370 return mLeft; 7371 } 7372 7373 /** 7374 * Sets the left position of this view relative to its parent. This method is meant to be called 7375 * by the layout system and should not generally be called otherwise, because the property 7376 * may be changed at any time by the layout. 7377 * 7378 * @param left The bottom of this view, in pixels. 7379 */ 7380 public final void setLeft(int left) { 7381 if (left != mLeft) { 7382 updateMatrix(); 7383 if (mMatrixIsIdentity) { 7384 if (mAttachInfo != null) { 7385 int minLeft; 7386 int xLoc; 7387 if (left < mLeft) { 7388 minLeft = left; 7389 xLoc = left - mLeft; 7390 } else { 7391 minLeft = mLeft; 7392 xLoc = 0; 7393 } 7394 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7395 } 7396 } else { 7397 // Double-invalidation is necessary to capture view's old and new areas 7398 invalidate(true); 7399 } 7400 7401 int oldWidth = mRight - mLeft; 7402 int height = mBottom - mTop; 7403 7404 mLeft = left; 7405 7406 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7407 7408 if (!mMatrixIsIdentity) { 7409 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7410 // A change in dimension means an auto-centered pivot point changes, too 7411 mMatrixDirty = true; 7412 } 7413 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7414 invalidate(true); 7415 } 7416 mBackgroundSizeChanged = true; 7417 invalidateParentIfNeeded(); 7418 } 7419 } 7420 7421 /** 7422 * Right position of this view relative to its parent. 7423 * 7424 * @return The right edge of this view, in pixels. 7425 */ 7426 @ViewDebug.CapturedViewProperty 7427 public final int getRight() { 7428 return mRight; 7429 } 7430 7431 /** 7432 * Sets the right position of this view relative to its parent. This method is meant to be called 7433 * by the layout system and should not generally be called otherwise, because the property 7434 * may be changed at any time by the layout. 7435 * 7436 * @param right The bottom of this view, in pixels. 7437 */ 7438 public final void setRight(int right) { 7439 if (right != mRight) { 7440 updateMatrix(); 7441 if (mMatrixIsIdentity) { 7442 if (mAttachInfo != null) { 7443 int maxRight; 7444 if (right < mRight) { 7445 maxRight = mRight; 7446 } else { 7447 maxRight = right; 7448 } 7449 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7450 } 7451 } else { 7452 // Double-invalidation is necessary to capture view's old and new areas 7453 invalidate(true); 7454 } 7455 7456 int oldWidth = mRight - mLeft; 7457 int height = mBottom - mTop; 7458 7459 mRight = right; 7460 7461 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7462 7463 if (!mMatrixIsIdentity) { 7464 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7465 // A change in dimension means an auto-centered pivot point changes, too 7466 mMatrixDirty = true; 7467 } 7468 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7469 invalidate(true); 7470 } 7471 mBackgroundSizeChanged = true; 7472 invalidateParentIfNeeded(); 7473 } 7474 } 7475 7476 /** 7477 * The visual x position of this view, in pixels. This is equivalent to the 7478 * {@link #setTranslationX(float) translationX} property plus the current 7479 * {@link #getLeft() left} property. 7480 * 7481 * @return The visual x position of this view, in pixels. 7482 */ 7483 public float getX() { 7484 return mLeft + mTranslationX; 7485 } 7486 7487 /** 7488 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 7489 * {@link #setTranslationX(float) translationX} property to be the difference between 7490 * the x value passed in and the current {@link #getLeft() left} property. 7491 * 7492 * @param x The visual x position of this view, in pixels. 7493 */ 7494 public void setX(float x) { 7495 setTranslationX(x - mLeft); 7496 } 7497 7498 /** 7499 * The visual y position of this view, in pixels. This is equivalent to the 7500 * {@link #setTranslationY(float) translationY} property plus the current 7501 * {@link #getTop() top} property. 7502 * 7503 * @return The visual y position of this view, in pixels. 7504 */ 7505 public float getY() { 7506 return mTop + mTranslationY; 7507 } 7508 7509 /** 7510 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 7511 * {@link #setTranslationY(float) translationY} property to be the difference between 7512 * the y value passed in and the current {@link #getTop() top} property. 7513 * 7514 * @param y The visual y position of this view, in pixels. 7515 */ 7516 public void setY(float y) { 7517 setTranslationY(y - mTop); 7518 } 7519 7520 7521 /** 7522 * The horizontal location of this view relative to its {@link #getLeft() left} position. 7523 * This position is post-layout, in addition to wherever the object's 7524 * layout placed it. 7525 * 7526 * @return The horizontal position of this view relative to its left position, in pixels. 7527 */ 7528 public float getTranslationX() { 7529 return mTranslationX; 7530 } 7531 7532 /** 7533 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 7534 * This effectively positions the object post-layout, in addition to wherever the object's 7535 * layout placed it. 7536 * 7537 * @param translationX The horizontal position of this view relative to its left position, 7538 * in pixels. 7539 * 7540 * @attr ref android.R.styleable#View_translationX 7541 */ 7542 public void setTranslationX(float translationX) { 7543 if (mTranslationX != translationX) { 7544 invalidateParentCaches(); 7545 // Double-invalidation is necessary to capture view's old and new areas 7546 invalidate(false); 7547 mTranslationX = translationX; 7548 mMatrixDirty = true; 7549 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7550 invalidate(false); 7551 } 7552 } 7553 7554 /** 7555 * The horizontal location of this view relative to its {@link #getTop() top} position. 7556 * This position is post-layout, in addition to wherever the object's 7557 * layout placed it. 7558 * 7559 * @return The vertical position of this view relative to its top position, 7560 * in pixels. 7561 */ 7562 public float getTranslationY() { 7563 return mTranslationY; 7564 } 7565 7566 /** 7567 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 7568 * This effectively positions the object post-layout, in addition to wherever the object's 7569 * layout placed it. 7570 * 7571 * @param translationY The vertical position of this view relative to its top position, 7572 * in pixels. 7573 * 7574 * @attr ref android.R.styleable#View_translationY 7575 */ 7576 public void setTranslationY(float translationY) { 7577 if (mTranslationY != translationY) { 7578 invalidateParentCaches(); 7579 // Double-invalidation is necessary to capture view's old and new areas 7580 invalidate(false); 7581 mTranslationY = translationY; 7582 mMatrixDirty = true; 7583 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7584 invalidate(false); 7585 } 7586 } 7587 7588 /** 7589 * @hide 7590 */ 7591 public void setFastTranslationX(float x) { 7592 mTranslationX = x; 7593 mMatrixDirty = true; 7594 } 7595 7596 /** 7597 * @hide 7598 */ 7599 public void setFastTranslationY(float y) { 7600 mTranslationY = y; 7601 mMatrixDirty = true; 7602 } 7603 7604 /** 7605 * @hide 7606 */ 7607 public void setFastX(float x) { 7608 mTranslationX = x - mLeft; 7609 mMatrixDirty = true; 7610 } 7611 7612 /** 7613 * @hide 7614 */ 7615 public void setFastY(float y) { 7616 mTranslationY = y - mTop; 7617 mMatrixDirty = true; 7618 } 7619 7620 /** 7621 * @hide 7622 */ 7623 public void setFastScaleX(float x) { 7624 mScaleX = x; 7625 mMatrixDirty = true; 7626 } 7627 7628 /** 7629 * @hide 7630 */ 7631 public void setFastScaleY(float y) { 7632 mScaleY = y; 7633 mMatrixDirty = true; 7634 } 7635 7636 /** 7637 * @hide 7638 */ 7639 public void setFastAlpha(float alpha) { 7640 mAlpha = alpha; 7641 } 7642 7643 /** 7644 * @hide 7645 */ 7646 public void setFastRotationY(float y) { 7647 mRotationY = y; 7648 mMatrixDirty = true; 7649 } 7650 7651 /** 7652 * Hit rectangle in parent's coordinates 7653 * 7654 * @param outRect The hit rectangle of the view. 7655 */ 7656 public void getHitRect(Rect outRect) { 7657 updateMatrix(); 7658 if (mMatrixIsIdentity || mAttachInfo == null) { 7659 outRect.set(mLeft, mTop, mRight, mBottom); 7660 } else { 7661 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 7662 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 7663 mMatrix.mapRect(tmpRect); 7664 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 7665 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 7666 } 7667 } 7668 7669 /** 7670 * Determines whether the given point, in local coordinates is inside the view. 7671 */ 7672 /*package*/ final boolean pointInView(float localX, float localY) { 7673 return localX >= 0 && localX < (mRight - mLeft) 7674 && localY >= 0 && localY < (mBottom - mTop); 7675 } 7676 7677 /** 7678 * Utility method to determine whether the given point, in local coordinates, 7679 * is inside the view, where the area of the view is expanded by the slop factor. 7680 * This method is called while processing touch-move events to determine if the event 7681 * is still within the view. 7682 */ 7683 private boolean pointInView(float localX, float localY, float slop) { 7684 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 7685 localY < ((mBottom - mTop) + slop); 7686 } 7687 7688 /** 7689 * When a view has focus and the user navigates away from it, the next view is searched for 7690 * starting from the rectangle filled in by this method. 7691 * 7692 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 7693 * of the view. However, if your view maintains some idea of internal selection, 7694 * such as a cursor, or a selected row or column, you should override this method and 7695 * fill in a more specific rectangle. 7696 * 7697 * @param r The rectangle to fill in, in this view's coordinates. 7698 */ 7699 public void getFocusedRect(Rect r) { 7700 getDrawingRect(r); 7701 } 7702 7703 /** 7704 * If some part of this view is not clipped by any of its parents, then 7705 * return that area in r in global (root) coordinates. To convert r to local 7706 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 7707 * -globalOffset.y)) If the view is completely clipped or translated out, 7708 * return false. 7709 * 7710 * @param r If true is returned, r holds the global coordinates of the 7711 * visible portion of this view. 7712 * @param globalOffset If true is returned, globalOffset holds the dx,dy 7713 * between this view and its root. globalOffet may be null. 7714 * @return true if r is non-empty (i.e. part of the view is visible at the 7715 * root level. 7716 */ 7717 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 7718 int width = mRight - mLeft; 7719 int height = mBottom - mTop; 7720 if (width > 0 && height > 0) { 7721 r.set(0, 0, width, height); 7722 if (globalOffset != null) { 7723 globalOffset.set(-mScrollX, -mScrollY); 7724 } 7725 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 7726 } 7727 return false; 7728 } 7729 7730 public final boolean getGlobalVisibleRect(Rect r) { 7731 return getGlobalVisibleRect(r, null); 7732 } 7733 7734 public final boolean getLocalVisibleRect(Rect r) { 7735 Point offset = new Point(); 7736 if (getGlobalVisibleRect(r, offset)) { 7737 r.offset(-offset.x, -offset.y); // make r local 7738 return true; 7739 } 7740 return false; 7741 } 7742 7743 /** 7744 * Offset this view's vertical location by the specified number of pixels. 7745 * 7746 * @param offset the number of pixels to offset the view by 7747 */ 7748 public void offsetTopAndBottom(int offset) { 7749 if (offset != 0) { 7750 updateMatrix(); 7751 if (mMatrixIsIdentity) { 7752 final ViewParent p = mParent; 7753 if (p != null && mAttachInfo != null) { 7754 final Rect r = mAttachInfo.mTmpInvalRect; 7755 int minTop; 7756 int maxBottom; 7757 int yLoc; 7758 if (offset < 0) { 7759 minTop = mTop + offset; 7760 maxBottom = mBottom; 7761 yLoc = offset; 7762 } else { 7763 minTop = mTop; 7764 maxBottom = mBottom + offset; 7765 yLoc = 0; 7766 } 7767 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 7768 p.invalidateChild(this, r); 7769 } 7770 } else { 7771 invalidate(false); 7772 } 7773 7774 mTop += offset; 7775 mBottom += offset; 7776 7777 if (!mMatrixIsIdentity) { 7778 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7779 invalidate(false); 7780 } 7781 invalidateParentIfNeeded(); 7782 } 7783 } 7784 7785 /** 7786 * Offset this view's horizontal location by the specified amount of pixels. 7787 * 7788 * @param offset the numer of pixels to offset the view by 7789 */ 7790 public void offsetLeftAndRight(int offset) { 7791 if (offset != 0) { 7792 updateMatrix(); 7793 if (mMatrixIsIdentity) { 7794 final ViewParent p = mParent; 7795 if (p != null && mAttachInfo != null) { 7796 final Rect r = mAttachInfo.mTmpInvalRect; 7797 int minLeft; 7798 int maxRight; 7799 if (offset < 0) { 7800 minLeft = mLeft + offset; 7801 maxRight = mRight; 7802 } else { 7803 minLeft = mLeft; 7804 maxRight = mRight + offset; 7805 } 7806 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 7807 p.invalidateChild(this, r); 7808 } 7809 } else { 7810 invalidate(false); 7811 } 7812 7813 mLeft += offset; 7814 mRight += offset; 7815 7816 if (!mMatrixIsIdentity) { 7817 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7818 invalidate(false); 7819 } 7820 invalidateParentIfNeeded(); 7821 } 7822 } 7823 7824 /** 7825 * Get the LayoutParams associated with this view. All views should have 7826 * layout parameters. These supply parameters to the <i>parent</i> of this 7827 * view specifying how it should be arranged. There are many subclasses of 7828 * ViewGroup.LayoutParams, and these correspond to the different subclasses 7829 * of ViewGroup that are responsible for arranging their children. 7830 * 7831 * This method may return null if this View is not attached to a parent 7832 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 7833 * was not invoked successfully. When a View is attached to a parent 7834 * ViewGroup, this method must not return null. 7835 * 7836 * @return The LayoutParams associated with this view, or null if no 7837 * parameters have been set yet 7838 */ 7839 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 7840 public ViewGroup.LayoutParams getLayoutParams() { 7841 return mLayoutParams; 7842 } 7843 7844 /** 7845 * Set the layout parameters associated with this view. These supply 7846 * parameters to the <i>parent</i> of this view specifying how it should be 7847 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 7848 * correspond to the different subclasses of ViewGroup that are responsible 7849 * for arranging their children. 7850 * 7851 * @param params The layout parameters for this view, cannot be null 7852 */ 7853 public void setLayoutParams(ViewGroup.LayoutParams params) { 7854 if (params == null) { 7855 throw new NullPointerException("Layout parameters cannot be null"); 7856 } 7857 mLayoutParams = params; 7858 requestLayout(); 7859 } 7860 7861 /** 7862 * Set the scrolled position of your view. This will cause a call to 7863 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7864 * invalidated. 7865 * @param x the x position to scroll to 7866 * @param y the y position to scroll to 7867 */ 7868 public void scrollTo(int x, int y) { 7869 if (mScrollX != x || mScrollY != y) { 7870 int oldX = mScrollX; 7871 int oldY = mScrollY; 7872 mScrollX = x; 7873 mScrollY = y; 7874 invalidateParentCaches(); 7875 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 7876 if (!awakenScrollBars()) { 7877 invalidate(true); 7878 } 7879 } 7880 } 7881 7882 /** 7883 * Move the scrolled position of your view. This will cause a call to 7884 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7885 * invalidated. 7886 * @param x the amount of pixels to scroll by horizontally 7887 * @param y the amount of pixels to scroll by vertically 7888 */ 7889 public void scrollBy(int x, int y) { 7890 scrollTo(mScrollX + x, mScrollY + y); 7891 } 7892 7893 /** 7894 * <p>Trigger the scrollbars to draw. When invoked this method starts an 7895 * animation to fade the scrollbars out after a default delay. If a subclass 7896 * provides animated scrolling, the start delay should equal the duration 7897 * of the scrolling animation.</p> 7898 * 7899 * <p>The animation starts only if at least one of the scrollbars is 7900 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 7901 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7902 * this method returns true, and false otherwise. If the animation is 7903 * started, this method calls {@link #invalidate()}; in that case the 7904 * caller should not call {@link #invalidate()}.</p> 7905 * 7906 * <p>This method should be invoked every time a subclass directly updates 7907 * the scroll parameters.</p> 7908 * 7909 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 7910 * and {@link #scrollTo(int, int)}.</p> 7911 * 7912 * @return true if the animation is played, false otherwise 7913 * 7914 * @see #awakenScrollBars(int) 7915 * @see #scrollBy(int, int) 7916 * @see #scrollTo(int, int) 7917 * @see #isHorizontalScrollBarEnabled() 7918 * @see #isVerticalScrollBarEnabled() 7919 * @see #setHorizontalScrollBarEnabled(boolean) 7920 * @see #setVerticalScrollBarEnabled(boolean) 7921 */ 7922 protected boolean awakenScrollBars() { 7923 return mScrollCache != null && 7924 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 7925 } 7926 7927 /** 7928 * Trigger the scrollbars to draw. 7929 * This method differs from awakenScrollBars() only in its default duration. 7930 * initialAwakenScrollBars() will show the scroll bars for longer than 7931 * usual to give the user more of a chance to notice them. 7932 * 7933 * @return true if the animation is played, false otherwise. 7934 */ 7935 private boolean initialAwakenScrollBars() { 7936 return mScrollCache != null && 7937 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 7938 } 7939 7940 /** 7941 * <p> 7942 * Trigger the scrollbars to draw. When invoked this method starts an 7943 * animation to fade the scrollbars out after a fixed delay. If a subclass 7944 * provides animated scrolling, the start delay should equal the duration of 7945 * the scrolling animation. 7946 * </p> 7947 * 7948 * <p> 7949 * The animation starts only if at least one of the scrollbars is enabled, 7950 * as specified by {@link #isHorizontalScrollBarEnabled()} and 7951 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7952 * this method returns true, and false otherwise. If the animation is 7953 * started, this method calls {@link #invalidate()}; in that case the caller 7954 * should not call {@link #invalidate()}. 7955 * </p> 7956 * 7957 * <p> 7958 * This method should be invoked everytime a subclass directly updates the 7959 * scroll parameters. 7960 * </p> 7961 * 7962 * @param startDelay the delay, in milliseconds, after which the animation 7963 * should start; when the delay is 0, the animation starts 7964 * immediately 7965 * @return true if the animation is played, false otherwise 7966 * 7967 * @see #scrollBy(int, int) 7968 * @see #scrollTo(int, int) 7969 * @see #isHorizontalScrollBarEnabled() 7970 * @see #isVerticalScrollBarEnabled() 7971 * @see #setHorizontalScrollBarEnabled(boolean) 7972 * @see #setVerticalScrollBarEnabled(boolean) 7973 */ 7974 protected boolean awakenScrollBars(int startDelay) { 7975 return awakenScrollBars(startDelay, true); 7976 } 7977 7978 /** 7979 * <p> 7980 * Trigger the scrollbars to draw. When invoked this method starts an 7981 * animation to fade the scrollbars out after a fixed delay. If a subclass 7982 * provides animated scrolling, the start delay should equal the duration of 7983 * the scrolling animation. 7984 * </p> 7985 * 7986 * <p> 7987 * The animation starts only if at least one of the scrollbars is enabled, 7988 * as specified by {@link #isHorizontalScrollBarEnabled()} and 7989 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7990 * this method returns true, and false otherwise. If the animation is 7991 * started, this method calls {@link #invalidate()} if the invalidate parameter 7992 * is set to true; in that case the caller 7993 * should not call {@link #invalidate()}. 7994 * </p> 7995 * 7996 * <p> 7997 * This method should be invoked everytime a subclass directly updates the 7998 * scroll parameters. 7999 * </p> 8000 * 8001 * @param startDelay the delay, in milliseconds, after which the animation 8002 * should start; when the delay is 0, the animation starts 8003 * immediately 8004 * 8005 * @param invalidate Wheter this method should call invalidate 8006 * 8007 * @return true if the animation is played, false otherwise 8008 * 8009 * @see #scrollBy(int, int) 8010 * @see #scrollTo(int, int) 8011 * @see #isHorizontalScrollBarEnabled() 8012 * @see #isVerticalScrollBarEnabled() 8013 * @see #setHorizontalScrollBarEnabled(boolean) 8014 * @see #setVerticalScrollBarEnabled(boolean) 8015 */ 8016 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 8017 final ScrollabilityCache scrollCache = mScrollCache; 8018 8019 if (scrollCache == null || !scrollCache.fadeScrollBars) { 8020 return false; 8021 } 8022 8023 if (scrollCache.scrollBar == null) { 8024 scrollCache.scrollBar = new ScrollBarDrawable(); 8025 } 8026 8027 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 8028 8029 if (invalidate) { 8030 // Invalidate to show the scrollbars 8031 invalidate(true); 8032 } 8033 8034 if (scrollCache.state == ScrollabilityCache.OFF) { 8035 // FIXME: this is copied from WindowManagerService. 8036 // We should get this value from the system when it 8037 // is possible to do so. 8038 final int KEY_REPEAT_FIRST_DELAY = 750; 8039 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 8040 } 8041 8042 // Tell mScrollCache when we should start fading. This may 8043 // extend the fade start time if one was already scheduled 8044 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 8045 scrollCache.fadeStartTime = fadeStartTime; 8046 scrollCache.state = ScrollabilityCache.ON; 8047 8048 // Schedule our fader to run, unscheduling any old ones first 8049 if (mAttachInfo != null) { 8050 mAttachInfo.mHandler.removeCallbacks(scrollCache); 8051 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 8052 } 8053 8054 return true; 8055 } 8056 8057 return false; 8058 } 8059 8060 /** 8061 * Mark the the area defined by dirty as needing to be drawn. If the view is 8062 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 8063 * in the future. This must be called from a UI thread. To call from a non-UI 8064 * thread, call {@link #postInvalidate()}. 8065 * 8066 * WARNING: This method is destructive to dirty. 8067 * @param dirty the rectangle representing the bounds of the dirty region 8068 */ 8069 public void invalidate(Rect dirty) { 8070 if (ViewDebug.TRACE_HIERARCHY) { 8071 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8072 } 8073 8074 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8075 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8076 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8077 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8078 mPrivateFlags |= INVALIDATED; 8079 final ViewParent p = mParent; 8080 final AttachInfo ai = mAttachInfo; 8081 //noinspection PointlessBooleanExpression,ConstantConditions 8082 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8083 if (p != null && ai != null && ai.mHardwareAccelerated) { 8084 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8085 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8086 p.invalidateChild(this, null); 8087 return; 8088 } 8089 } 8090 if (p != null && ai != null) { 8091 final int scrollX = mScrollX; 8092 final int scrollY = mScrollY; 8093 final Rect r = ai.mTmpInvalRect; 8094 r.set(dirty.left - scrollX, dirty.top - scrollY, 8095 dirty.right - scrollX, dirty.bottom - scrollY); 8096 mParent.invalidateChild(this, r); 8097 } 8098 } 8099 } 8100 8101 /** 8102 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 8103 * The coordinates of the dirty rect are relative to the view. 8104 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 8105 * will be called at some point in the future. This must be called from 8106 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 8107 * @param l the left position of the dirty region 8108 * @param t the top position of the dirty region 8109 * @param r the right position of the dirty region 8110 * @param b the bottom position of the dirty region 8111 */ 8112 public void invalidate(int l, int t, int r, int b) { 8113 if (ViewDebug.TRACE_HIERARCHY) { 8114 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8115 } 8116 8117 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8118 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8119 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8120 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8121 mPrivateFlags |= INVALIDATED; 8122 final ViewParent p = mParent; 8123 final AttachInfo ai = mAttachInfo; 8124 //noinspection PointlessBooleanExpression,ConstantConditions 8125 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8126 if (p != null && ai != null && ai.mHardwareAccelerated) { 8127 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8128 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8129 p.invalidateChild(this, null); 8130 return; 8131 } 8132 } 8133 if (p != null && ai != null && l < r && t < b) { 8134 final int scrollX = mScrollX; 8135 final int scrollY = mScrollY; 8136 final Rect tmpr = ai.mTmpInvalRect; 8137 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 8138 p.invalidateChild(this, tmpr); 8139 } 8140 } 8141 } 8142 8143 /** 8144 * Invalidate the whole view. If the view is visible, 8145 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 8146 * the future. This must be called from a UI thread. To call from a non-UI thread, 8147 * call {@link #postInvalidate()}. 8148 */ 8149 public void invalidate() { 8150 invalidate(true); 8151 } 8152 8153 /** 8154 * This is where the invalidate() work actually happens. A full invalidate() 8155 * causes the drawing cache to be invalidated, but this function can be called with 8156 * invalidateCache set to false to skip that invalidation step for cases that do not 8157 * need it (for example, a component that remains at the same dimensions with the same 8158 * content). 8159 * 8160 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 8161 * well. This is usually true for a full invalidate, but may be set to false if the 8162 * View's contents or dimensions have not changed. 8163 */ 8164 void invalidate(boolean invalidateCache) { 8165 if (ViewDebug.TRACE_HIERARCHY) { 8166 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8167 } 8168 8169 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8170 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 8171 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 8172 mLastIsOpaque = isOpaque(); 8173 mPrivateFlags &= ~DRAWN; 8174 if (invalidateCache) { 8175 mPrivateFlags |= INVALIDATED; 8176 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8177 } 8178 final AttachInfo ai = mAttachInfo; 8179 final ViewParent p = mParent; 8180 //noinspection PointlessBooleanExpression,ConstantConditions 8181 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8182 if (p != null && ai != null && ai.mHardwareAccelerated) { 8183 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8184 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8185 p.invalidateChild(this, null); 8186 return; 8187 } 8188 } 8189 8190 if (p != null && ai != null) { 8191 final Rect r = ai.mTmpInvalRect; 8192 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8193 // Don't call invalidate -- we don't want to internally scroll 8194 // our own bounds 8195 p.invalidateChild(this, r); 8196 } 8197 } 8198 } 8199 8200 /** 8201 * @hide 8202 */ 8203 public void fastInvalidate() { 8204 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8205 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8206 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8207 if (mParent instanceof View) { 8208 ((View) mParent).mPrivateFlags |= INVALIDATED; 8209 } 8210 mPrivateFlags &= ~DRAWN; 8211 mPrivateFlags |= INVALIDATED; 8212 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8213 if (mParent != null && mAttachInfo != null) { 8214 if (mAttachInfo.mHardwareAccelerated) { 8215 mParent.invalidateChild(this, null); 8216 } else { 8217 final Rect r = mAttachInfo.mTmpInvalRect; 8218 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8219 // Don't call invalidate -- we don't want to internally scroll 8220 // our own bounds 8221 mParent.invalidateChild(this, r); 8222 } 8223 } 8224 } 8225 } 8226 8227 /** 8228 * Used to indicate that the parent of this view should clear its caches. This functionality 8229 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8230 * which is necessary when various parent-managed properties of the view change, such as 8231 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 8232 * clears the parent caches and does not causes an invalidate event. 8233 * 8234 * @hide 8235 */ 8236 protected void invalidateParentCaches() { 8237 if (mParent instanceof View) { 8238 ((View) mParent).mPrivateFlags |= INVALIDATED; 8239 } 8240 } 8241 8242 /** 8243 * Used to indicate that the parent of this view should be invalidated. This functionality 8244 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8245 * which is necessary when various parent-managed properties of the view change, such as 8246 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 8247 * an invalidation event to the parent. 8248 * 8249 * @hide 8250 */ 8251 protected void invalidateParentIfNeeded() { 8252 if (isHardwareAccelerated() && mParent instanceof View) { 8253 ((View) mParent).invalidate(true); 8254 } 8255 } 8256 8257 /** 8258 * Indicates whether this View is opaque. An opaque View guarantees that it will 8259 * draw all the pixels overlapping its bounds using a fully opaque color. 8260 * 8261 * Subclasses of View should override this method whenever possible to indicate 8262 * whether an instance is opaque. Opaque Views are treated in a special way by 8263 * the View hierarchy, possibly allowing it to perform optimizations during 8264 * invalidate/draw passes. 8265 * 8266 * @return True if this View is guaranteed to be fully opaque, false otherwise. 8267 */ 8268 @ViewDebug.ExportedProperty(category = "drawing") 8269 public boolean isOpaque() { 8270 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 8271 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 8272 } 8273 8274 /** 8275 * @hide 8276 */ 8277 protected void computeOpaqueFlags() { 8278 // Opaque if: 8279 // - Has a background 8280 // - Background is opaque 8281 // - Doesn't have scrollbars or scrollbars are inside overlay 8282 8283 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 8284 mPrivateFlags |= OPAQUE_BACKGROUND; 8285 } else { 8286 mPrivateFlags &= ~OPAQUE_BACKGROUND; 8287 } 8288 8289 final int flags = mViewFlags; 8290 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 8291 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 8292 mPrivateFlags |= OPAQUE_SCROLLBARS; 8293 } else { 8294 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 8295 } 8296 } 8297 8298 /** 8299 * @hide 8300 */ 8301 protected boolean hasOpaqueScrollbars() { 8302 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 8303 } 8304 8305 /** 8306 * @return A handler associated with the thread running the View. This 8307 * handler can be used to pump events in the UI events queue. 8308 */ 8309 public Handler getHandler() { 8310 if (mAttachInfo != null) { 8311 return mAttachInfo.mHandler; 8312 } 8313 return null; 8314 } 8315 8316 /** 8317 * Causes the Runnable to be added to the message queue. 8318 * The runnable will be run on the user interface thread. 8319 * 8320 * @param action The Runnable that will be executed. 8321 * 8322 * @return Returns true if the Runnable was successfully placed in to the 8323 * message queue. Returns false on failure, usually because the 8324 * looper processing the message queue is exiting. 8325 */ 8326 public boolean post(Runnable action) { 8327 Handler handler; 8328 AttachInfo attachInfo = mAttachInfo; 8329 if (attachInfo != null) { 8330 handler = attachInfo.mHandler; 8331 } else { 8332 // Assume that post will succeed later 8333 ViewRootImpl.getRunQueue().post(action); 8334 return true; 8335 } 8336 8337 return handler.post(action); 8338 } 8339 8340 /** 8341 * Causes the Runnable to be added to the message queue, to be run 8342 * after the specified amount of time elapses. 8343 * The runnable will be run on the user interface thread. 8344 * 8345 * @param action The Runnable that will be executed. 8346 * @param delayMillis The delay (in milliseconds) until the Runnable 8347 * will be executed. 8348 * 8349 * @return true if the Runnable was successfully placed in to the 8350 * message queue. Returns false on failure, usually because the 8351 * looper processing the message queue is exiting. Note that a 8352 * result of true does not mean the Runnable will be processed -- 8353 * if the looper is quit before the delivery time of the message 8354 * occurs then the message will be dropped. 8355 */ 8356 public boolean postDelayed(Runnable action, long delayMillis) { 8357 Handler handler; 8358 AttachInfo attachInfo = mAttachInfo; 8359 if (attachInfo != null) { 8360 handler = attachInfo.mHandler; 8361 } else { 8362 // Assume that post will succeed later 8363 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8364 return true; 8365 } 8366 8367 return handler.postDelayed(action, delayMillis); 8368 } 8369 8370 /** 8371 * Removes the specified Runnable from the message queue. 8372 * 8373 * @param action The Runnable to remove from the message handling queue 8374 * 8375 * @return true if this view could ask the Handler to remove the Runnable, 8376 * false otherwise. When the returned value is true, the Runnable 8377 * may or may not have been actually removed from the message queue 8378 * (for instance, if the Runnable was not in the queue already.) 8379 */ 8380 public boolean removeCallbacks(Runnable action) { 8381 Handler handler; 8382 AttachInfo attachInfo = mAttachInfo; 8383 if (attachInfo != null) { 8384 handler = attachInfo.mHandler; 8385 } else { 8386 // Assume that post will succeed later 8387 ViewRootImpl.getRunQueue().removeCallbacks(action); 8388 return true; 8389 } 8390 8391 handler.removeCallbacks(action); 8392 return true; 8393 } 8394 8395 /** 8396 * Cause an invalidate to happen on a subsequent cycle through the event loop. 8397 * Use this to invalidate the View from a non-UI thread. 8398 * 8399 * @see #invalidate() 8400 */ 8401 public void postInvalidate() { 8402 postInvalidateDelayed(0); 8403 } 8404 8405 /** 8406 * Cause an invalidate of the specified area to happen on a subsequent cycle 8407 * through the event loop. Use this to invalidate the View from a non-UI thread. 8408 * 8409 * @param left The left coordinate of the rectangle to invalidate. 8410 * @param top The top coordinate of the rectangle to invalidate. 8411 * @param right The right coordinate of the rectangle to invalidate. 8412 * @param bottom The bottom coordinate of the rectangle to invalidate. 8413 * 8414 * @see #invalidate(int, int, int, int) 8415 * @see #invalidate(Rect) 8416 */ 8417 public void postInvalidate(int left, int top, int right, int bottom) { 8418 postInvalidateDelayed(0, left, top, right, bottom); 8419 } 8420 8421 /** 8422 * Cause an invalidate to happen on a subsequent cycle through the event 8423 * loop. Waits for the specified amount of time. 8424 * 8425 * @param delayMilliseconds the duration in milliseconds to delay the 8426 * invalidation by 8427 */ 8428 public void postInvalidateDelayed(long delayMilliseconds) { 8429 // We try only with the AttachInfo because there's no point in invalidating 8430 // if we are not attached to our window 8431 AttachInfo attachInfo = mAttachInfo; 8432 if (attachInfo != null) { 8433 Message msg = Message.obtain(); 8434 msg.what = AttachInfo.INVALIDATE_MSG; 8435 msg.obj = this; 8436 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8437 } 8438 } 8439 8440 /** 8441 * Cause an invalidate of the specified area to happen on a subsequent cycle 8442 * through the event loop. Waits for the specified amount of time. 8443 * 8444 * @param delayMilliseconds the duration in milliseconds to delay the 8445 * invalidation by 8446 * @param left The left coordinate of the rectangle to invalidate. 8447 * @param top The top coordinate of the rectangle to invalidate. 8448 * @param right The right coordinate of the rectangle to invalidate. 8449 * @param bottom The bottom coordinate of the rectangle to invalidate. 8450 */ 8451 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8452 int right, int bottom) { 8453 8454 // We try only with the AttachInfo because there's no point in invalidating 8455 // if we are not attached to our window 8456 AttachInfo attachInfo = mAttachInfo; 8457 if (attachInfo != null) { 8458 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8459 info.target = this; 8460 info.left = left; 8461 info.top = top; 8462 info.right = right; 8463 info.bottom = bottom; 8464 8465 final Message msg = Message.obtain(); 8466 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 8467 msg.obj = info; 8468 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8469 } 8470 } 8471 8472 /** 8473 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 8474 * This event is sent at most once every 8475 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 8476 */ 8477 private void postSendViewScrolledAccessibilityEventCallback() { 8478 if (mSendViewScrolledAccessibilityEvent == null) { 8479 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 8480 } 8481 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 8482 mSendViewScrolledAccessibilityEvent.mIsPending = true; 8483 postDelayed(mSendViewScrolledAccessibilityEvent, 8484 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 8485 } 8486 } 8487 8488 /** 8489 * Called by a parent to request that a child update its values for mScrollX 8490 * and mScrollY if necessary. This will typically be done if the child is 8491 * animating a scroll using a {@link android.widget.Scroller Scroller} 8492 * object. 8493 */ 8494 public void computeScroll() { 8495 } 8496 8497 /** 8498 * <p>Indicate whether the horizontal edges are faded when the view is 8499 * scrolled horizontally.</p> 8500 * 8501 * @return true if the horizontal edges should are faded on scroll, false 8502 * otherwise 8503 * 8504 * @see #setHorizontalFadingEdgeEnabled(boolean) 8505 * @attr ref android.R.styleable#View_fadingEdge 8506 */ 8507 public boolean isHorizontalFadingEdgeEnabled() { 8508 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 8509 } 8510 8511 /** 8512 * <p>Define whether the horizontal edges should be faded when this view 8513 * is scrolled horizontally.</p> 8514 * 8515 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 8516 * be faded when the view is scrolled 8517 * horizontally 8518 * 8519 * @see #isHorizontalFadingEdgeEnabled() 8520 * @attr ref android.R.styleable#View_fadingEdge 8521 */ 8522 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 8523 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 8524 if (horizontalFadingEdgeEnabled) { 8525 initScrollCache(); 8526 } 8527 8528 mViewFlags ^= FADING_EDGE_HORIZONTAL; 8529 } 8530 } 8531 8532 /** 8533 * <p>Indicate whether the vertical edges are faded when the view is 8534 * scrolled horizontally.</p> 8535 * 8536 * @return true if the vertical edges should are faded on scroll, false 8537 * otherwise 8538 * 8539 * @see #setVerticalFadingEdgeEnabled(boolean) 8540 * @attr ref android.R.styleable#View_fadingEdge 8541 */ 8542 public boolean isVerticalFadingEdgeEnabled() { 8543 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 8544 } 8545 8546 /** 8547 * <p>Define whether the vertical edges should be faded when this view 8548 * is scrolled vertically.</p> 8549 * 8550 * @param verticalFadingEdgeEnabled true if the vertical edges should 8551 * be faded when the view is scrolled 8552 * vertically 8553 * 8554 * @see #isVerticalFadingEdgeEnabled() 8555 * @attr ref android.R.styleable#View_fadingEdge 8556 */ 8557 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 8558 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 8559 if (verticalFadingEdgeEnabled) { 8560 initScrollCache(); 8561 } 8562 8563 mViewFlags ^= FADING_EDGE_VERTICAL; 8564 } 8565 } 8566 8567 /** 8568 * Returns the strength, or intensity, of the top faded edge. The strength is 8569 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8570 * returns 0.0 or 1.0 but no value in between. 8571 * 8572 * Subclasses should override this method to provide a smoother fade transition 8573 * when scrolling occurs. 8574 * 8575 * @return the intensity of the top fade as a float between 0.0f and 1.0f 8576 */ 8577 protected float getTopFadingEdgeStrength() { 8578 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 8579 } 8580 8581 /** 8582 * Returns the strength, or intensity, of the bottom faded edge. The strength is 8583 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8584 * returns 0.0 or 1.0 but no value in between. 8585 * 8586 * Subclasses should override this method to provide a smoother fade transition 8587 * when scrolling occurs. 8588 * 8589 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 8590 */ 8591 protected float getBottomFadingEdgeStrength() { 8592 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 8593 computeVerticalScrollRange() ? 1.0f : 0.0f; 8594 } 8595 8596 /** 8597 * Returns the strength, or intensity, of the left faded edge. The strength is 8598 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8599 * returns 0.0 or 1.0 but no value in between. 8600 * 8601 * Subclasses should override this method to provide a smoother fade transition 8602 * when scrolling occurs. 8603 * 8604 * @return the intensity of the left fade as a float between 0.0f and 1.0f 8605 */ 8606 protected float getLeftFadingEdgeStrength() { 8607 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 8608 } 8609 8610 /** 8611 * Returns the strength, or intensity, of the right faded edge. The strength is 8612 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8613 * returns 0.0 or 1.0 but no value in between. 8614 * 8615 * Subclasses should override this method to provide a smoother fade transition 8616 * when scrolling occurs. 8617 * 8618 * @return the intensity of the right fade as a float between 0.0f and 1.0f 8619 */ 8620 protected float getRightFadingEdgeStrength() { 8621 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 8622 computeHorizontalScrollRange() ? 1.0f : 0.0f; 8623 } 8624 8625 /** 8626 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 8627 * scrollbar is not drawn by default.</p> 8628 * 8629 * @return true if the horizontal scrollbar should be painted, false 8630 * otherwise 8631 * 8632 * @see #setHorizontalScrollBarEnabled(boolean) 8633 */ 8634 public boolean isHorizontalScrollBarEnabled() { 8635 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 8636 } 8637 8638 /** 8639 * <p>Define whether the horizontal scrollbar should be drawn or not. The 8640 * scrollbar is not drawn by default.</p> 8641 * 8642 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 8643 * be painted 8644 * 8645 * @see #isHorizontalScrollBarEnabled() 8646 */ 8647 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 8648 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 8649 mViewFlags ^= SCROLLBARS_HORIZONTAL; 8650 computeOpaqueFlags(); 8651 resolvePadding(); 8652 } 8653 } 8654 8655 /** 8656 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 8657 * scrollbar is not drawn by default.</p> 8658 * 8659 * @return true if the vertical scrollbar should be painted, false 8660 * otherwise 8661 * 8662 * @see #setVerticalScrollBarEnabled(boolean) 8663 */ 8664 public boolean isVerticalScrollBarEnabled() { 8665 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 8666 } 8667 8668 /** 8669 * <p>Define whether the vertical scrollbar should be drawn or not. The 8670 * scrollbar is not drawn by default.</p> 8671 * 8672 * @param verticalScrollBarEnabled true if the vertical scrollbar should 8673 * be painted 8674 * 8675 * @see #isVerticalScrollBarEnabled() 8676 */ 8677 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 8678 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 8679 mViewFlags ^= SCROLLBARS_VERTICAL; 8680 computeOpaqueFlags(); 8681 resolvePadding(); 8682 } 8683 } 8684 8685 /** 8686 * @hide 8687 */ 8688 protected void recomputePadding() { 8689 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 8690 } 8691 8692 /** 8693 * Define whether scrollbars will fade when the view is not scrolling. 8694 * 8695 * @param fadeScrollbars wheter to enable fading 8696 * 8697 */ 8698 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 8699 initScrollCache(); 8700 final ScrollabilityCache scrollabilityCache = mScrollCache; 8701 scrollabilityCache.fadeScrollBars = fadeScrollbars; 8702 if (fadeScrollbars) { 8703 scrollabilityCache.state = ScrollabilityCache.OFF; 8704 } else { 8705 scrollabilityCache.state = ScrollabilityCache.ON; 8706 } 8707 } 8708 8709 /** 8710 * 8711 * Returns true if scrollbars will fade when this view is not scrolling 8712 * 8713 * @return true if scrollbar fading is enabled 8714 */ 8715 public boolean isScrollbarFadingEnabled() { 8716 return mScrollCache != null && mScrollCache.fadeScrollBars; 8717 } 8718 8719 /** 8720 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 8721 * inset. When inset, they add to the padding of the view. And the scrollbars 8722 * can be drawn inside the padding area or on the edge of the view. For example, 8723 * if a view has a background drawable and you want to draw the scrollbars 8724 * inside the padding specified by the drawable, you can use 8725 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 8726 * appear at the edge of the view, ignoring the padding, then you can use 8727 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 8728 * @param style the style of the scrollbars. Should be one of 8729 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 8730 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 8731 * @see #SCROLLBARS_INSIDE_OVERLAY 8732 * @see #SCROLLBARS_INSIDE_INSET 8733 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8734 * @see #SCROLLBARS_OUTSIDE_INSET 8735 */ 8736 public void setScrollBarStyle(int style) { 8737 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 8738 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 8739 computeOpaqueFlags(); 8740 resolvePadding(); 8741 } 8742 } 8743 8744 /** 8745 * <p>Returns the current scrollbar style.</p> 8746 * @return the current scrollbar style 8747 * @see #SCROLLBARS_INSIDE_OVERLAY 8748 * @see #SCROLLBARS_INSIDE_INSET 8749 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8750 * @see #SCROLLBARS_OUTSIDE_INSET 8751 */ 8752 public int getScrollBarStyle() { 8753 return mViewFlags & SCROLLBARS_STYLE_MASK; 8754 } 8755 8756 /** 8757 * <p>Compute the horizontal range that the horizontal scrollbar 8758 * represents.</p> 8759 * 8760 * <p>The range is expressed in arbitrary units that must be the same as the 8761 * units used by {@link #computeHorizontalScrollExtent()} and 8762 * {@link #computeHorizontalScrollOffset()}.</p> 8763 * 8764 * <p>The default range is the drawing width of this view.</p> 8765 * 8766 * @return the total horizontal range represented by the horizontal 8767 * scrollbar 8768 * 8769 * @see #computeHorizontalScrollExtent() 8770 * @see #computeHorizontalScrollOffset() 8771 * @see android.widget.ScrollBarDrawable 8772 */ 8773 protected int computeHorizontalScrollRange() { 8774 return getWidth(); 8775 } 8776 8777 /** 8778 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 8779 * within the horizontal range. This value is used to compute the position 8780 * of the thumb within the scrollbar's track.</p> 8781 * 8782 * <p>The range is expressed in arbitrary units that must be the same as the 8783 * units used by {@link #computeHorizontalScrollRange()} and 8784 * {@link #computeHorizontalScrollExtent()}.</p> 8785 * 8786 * <p>The default offset is the scroll offset of this view.</p> 8787 * 8788 * @return the horizontal offset of the scrollbar's thumb 8789 * 8790 * @see #computeHorizontalScrollRange() 8791 * @see #computeHorizontalScrollExtent() 8792 * @see android.widget.ScrollBarDrawable 8793 */ 8794 protected int computeHorizontalScrollOffset() { 8795 return mScrollX; 8796 } 8797 8798 /** 8799 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 8800 * within the horizontal range. This value is used to compute the length 8801 * of the thumb within the scrollbar's track.</p> 8802 * 8803 * <p>The range is expressed in arbitrary units that must be the same as the 8804 * units used by {@link #computeHorizontalScrollRange()} and 8805 * {@link #computeHorizontalScrollOffset()}.</p> 8806 * 8807 * <p>The default extent is the drawing width of this view.</p> 8808 * 8809 * @return the horizontal extent of the scrollbar's thumb 8810 * 8811 * @see #computeHorizontalScrollRange() 8812 * @see #computeHorizontalScrollOffset() 8813 * @see android.widget.ScrollBarDrawable 8814 */ 8815 protected int computeHorizontalScrollExtent() { 8816 return getWidth(); 8817 } 8818 8819 /** 8820 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 8821 * 8822 * <p>The range is expressed in arbitrary units that must be the same as the 8823 * units used by {@link #computeVerticalScrollExtent()} and 8824 * {@link #computeVerticalScrollOffset()}.</p> 8825 * 8826 * @return the total vertical range represented by the vertical scrollbar 8827 * 8828 * <p>The default range is the drawing height of this view.</p> 8829 * 8830 * @see #computeVerticalScrollExtent() 8831 * @see #computeVerticalScrollOffset() 8832 * @see android.widget.ScrollBarDrawable 8833 */ 8834 protected int computeVerticalScrollRange() { 8835 return getHeight(); 8836 } 8837 8838 /** 8839 * <p>Compute the vertical offset of the vertical scrollbar's thumb 8840 * within the horizontal range. This value is used to compute the position 8841 * of the thumb within the scrollbar's track.</p> 8842 * 8843 * <p>The range is expressed in arbitrary units that must be the same as the 8844 * units used by {@link #computeVerticalScrollRange()} and 8845 * {@link #computeVerticalScrollExtent()}.</p> 8846 * 8847 * <p>The default offset is the scroll offset of this view.</p> 8848 * 8849 * @return the vertical offset of the scrollbar's thumb 8850 * 8851 * @see #computeVerticalScrollRange() 8852 * @see #computeVerticalScrollExtent() 8853 * @see android.widget.ScrollBarDrawable 8854 */ 8855 protected int computeVerticalScrollOffset() { 8856 return mScrollY; 8857 } 8858 8859 /** 8860 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 8861 * within the vertical range. This value is used to compute the length 8862 * of the thumb within the scrollbar's track.</p> 8863 * 8864 * <p>The range is expressed in arbitrary units that must be the same as the 8865 * units used by {@link #computeVerticalScrollRange()} and 8866 * {@link #computeVerticalScrollOffset()}.</p> 8867 * 8868 * <p>The default extent is the drawing height of this view.</p> 8869 * 8870 * @return the vertical extent of the scrollbar's thumb 8871 * 8872 * @see #computeVerticalScrollRange() 8873 * @see #computeVerticalScrollOffset() 8874 * @see android.widget.ScrollBarDrawable 8875 */ 8876 protected int computeVerticalScrollExtent() { 8877 return getHeight(); 8878 } 8879 8880 /** 8881 * Check if this view can be scrolled horizontally in a certain direction. 8882 * 8883 * @param direction Negative to check scrolling left, positive to check scrolling right. 8884 * @return true if this view can be scrolled in the specified direction, false otherwise. 8885 */ 8886 public boolean canScrollHorizontally(int direction) { 8887 final int offset = computeHorizontalScrollOffset(); 8888 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 8889 if (range == 0) return false; 8890 if (direction < 0) { 8891 return offset > 0; 8892 } else { 8893 return offset < range - 1; 8894 } 8895 } 8896 8897 /** 8898 * Check if this view can be scrolled vertically in a certain direction. 8899 * 8900 * @param direction Negative to check scrolling up, positive to check scrolling down. 8901 * @return true if this view can be scrolled in the specified direction, false otherwise. 8902 */ 8903 public boolean canScrollVertically(int direction) { 8904 final int offset = computeVerticalScrollOffset(); 8905 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 8906 if (range == 0) return false; 8907 if (direction < 0) { 8908 return offset > 0; 8909 } else { 8910 return offset < range - 1; 8911 } 8912 } 8913 8914 /** 8915 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 8916 * scrollbars are painted only if they have been awakened first.</p> 8917 * 8918 * @param canvas the canvas on which to draw the scrollbars 8919 * 8920 * @see #awakenScrollBars(int) 8921 */ 8922 protected final void onDrawScrollBars(Canvas canvas) { 8923 // scrollbars are drawn only when the animation is running 8924 final ScrollabilityCache cache = mScrollCache; 8925 if (cache != null) { 8926 8927 int state = cache.state; 8928 8929 if (state == ScrollabilityCache.OFF) { 8930 return; 8931 } 8932 8933 boolean invalidate = false; 8934 8935 if (state == ScrollabilityCache.FADING) { 8936 // We're fading -- get our fade interpolation 8937 if (cache.interpolatorValues == null) { 8938 cache.interpolatorValues = new float[1]; 8939 } 8940 8941 float[] values = cache.interpolatorValues; 8942 8943 // Stops the animation if we're done 8944 if (cache.scrollBarInterpolator.timeToValues(values) == 8945 Interpolator.Result.FREEZE_END) { 8946 cache.state = ScrollabilityCache.OFF; 8947 } else { 8948 cache.scrollBar.setAlpha(Math.round(values[0])); 8949 } 8950 8951 // This will make the scroll bars inval themselves after 8952 // drawing. We only want this when we're fading so that 8953 // we prevent excessive redraws 8954 invalidate = true; 8955 } else { 8956 // We're just on -- but we may have been fading before so 8957 // reset alpha 8958 cache.scrollBar.setAlpha(255); 8959 } 8960 8961 8962 final int viewFlags = mViewFlags; 8963 8964 final boolean drawHorizontalScrollBar = 8965 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 8966 final boolean drawVerticalScrollBar = 8967 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 8968 && !isVerticalScrollBarHidden(); 8969 8970 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 8971 final int width = mRight - mLeft; 8972 final int height = mBottom - mTop; 8973 8974 final ScrollBarDrawable scrollBar = cache.scrollBar; 8975 8976 final int scrollX = mScrollX; 8977 final int scrollY = mScrollY; 8978 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 8979 8980 int left, top, right, bottom; 8981 8982 if (drawHorizontalScrollBar) { 8983 int size = scrollBar.getSize(false); 8984 if (size <= 0) { 8985 size = cache.scrollBarSize; 8986 } 8987 8988 scrollBar.setParameters(computeHorizontalScrollRange(), 8989 computeHorizontalScrollOffset(), 8990 computeHorizontalScrollExtent(), false); 8991 final int verticalScrollBarGap = drawVerticalScrollBar ? 8992 getVerticalScrollbarWidth() : 0; 8993 top = scrollY + height - size - (mUserPaddingBottom & inside); 8994 left = scrollX + (mPaddingLeft & inside); 8995 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 8996 bottom = top + size; 8997 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 8998 if (invalidate) { 8999 invalidate(left, top, right, bottom); 9000 } 9001 } 9002 9003 if (drawVerticalScrollBar) { 9004 int size = scrollBar.getSize(true); 9005 if (size <= 0) { 9006 size = cache.scrollBarSize; 9007 } 9008 9009 scrollBar.setParameters(computeVerticalScrollRange(), 9010 computeVerticalScrollOffset(), 9011 computeVerticalScrollExtent(), true); 9012 switch (mVerticalScrollbarPosition) { 9013 default: 9014 case SCROLLBAR_POSITION_DEFAULT: 9015 case SCROLLBAR_POSITION_RIGHT: 9016 left = scrollX + width - size - (mUserPaddingRight & inside); 9017 break; 9018 case SCROLLBAR_POSITION_LEFT: 9019 left = scrollX + (mUserPaddingLeft & inside); 9020 break; 9021 } 9022 top = scrollY + (mPaddingTop & inside); 9023 right = left + size; 9024 bottom = scrollY + height - (mUserPaddingBottom & inside); 9025 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 9026 if (invalidate) { 9027 invalidate(left, top, right, bottom); 9028 } 9029 } 9030 } 9031 } 9032 } 9033 9034 /** 9035 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 9036 * FastScroller is visible. 9037 * @return whether to temporarily hide the vertical scrollbar 9038 * @hide 9039 */ 9040 protected boolean isVerticalScrollBarHidden() { 9041 return false; 9042 } 9043 9044 /** 9045 * <p>Draw the horizontal scrollbar if 9046 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 9047 * 9048 * @param canvas the canvas on which to draw the scrollbar 9049 * @param scrollBar the scrollbar's drawable 9050 * 9051 * @see #isHorizontalScrollBarEnabled() 9052 * @see #computeHorizontalScrollRange() 9053 * @see #computeHorizontalScrollExtent() 9054 * @see #computeHorizontalScrollOffset() 9055 * @see android.widget.ScrollBarDrawable 9056 * @hide 9057 */ 9058 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 9059 int l, int t, int r, int b) { 9060 scrollBar.setBounds(l, t, r, b); 9061 scrollBar.draw(canvas); 9062 } 9063 9064 /** 9065 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 9066 * returns true.</p> 9067 * 9068 * @param canvas the canvas on which to draw the scrollbar 9069 * @param scrollBar the scrollbar's drawable 9070 * 9071 * @see #isVerticalScrollBarEnabled() 9072 * @see #computeVerticalScrollRange() 9073 * @see #computeVerticalScrollExtent() 9074 * @see #computeVerticalScrollOffset() 9075 * @see android.widget.ScrollBarDrawable 9076 * @hide 9077 */ 9078 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 9079 int l, int t, int r, int b) { 9080 scrollBar.setBounds(l, t, r, b); 9081 scrollBar.draw(canvas); 9082 } 9083 9084 /** 9085 * Implement this to do your drawing. 9086 * 9087 * @param canvas the canvas on which the background will be drawn 9088 */ 9089 protected void onDraw(Canvas canvas) { 9090 } 9091 9092 /* 9093 * Caller is responsible for calling requestLayout if necessary. 9094 * (This allows addViewInLayout to not request a new layout.) 9095 */ 9096 void assignParent(ViewParent parent) { 9097 if (mParent == null) { 9098 mParent = parent; 9099 } else if (parent == null) { 9100 mParent = null; 9101 } else { 9102 throw new RuntimeException("view " + this + " being added, but" 9103 + " it already has a parent"); 9104 } 9105 } 9106 9107 /** 9108 * This is called when the view is attached to a window. At this point it 9109 * has a Surface and will start drawing. Note that this function is 9110 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 9111 * however it may be called any time before the first onDraw -- including 9112 * before or after {@link #onMeasure(int, int)}. 9113 * 9114 * @see #onDetachedFromWindow() 9115 */ 9116 protected void onAttachedToWindow() { 9117 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 9118 mParent.requestTransparentRegion(this); 9119 } 9120 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 9121 initialAwakenScrollBars(); 9122 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 9123 } 9124 jumpDrawablesToCurrentState(); 9125 resolveLayoutDirectionIfNeeded(); 9126 resolvePadding(); 9127 resolveTextDirection(); 9128 if (isFocused()) { 9129 InputMethodManager imm = InputMethodManager.peekInstance(); 9130 imm.focusIn(this); 9131 } 9132 } 9133 9134 /** 9135 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 9136 * that the parent directionality can and will be resolved before its children. 9137 */ 9138 private void resolveLayoutDirectionIfNeeded() { 9139 // Do not resolve if it is not needed 9140 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return; 9141 9142 // Clear any previous layout direction resolution 9143 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_RTL; 9144 9145 // Set resolved depending on layout direction 9146 switch (getLayoutDirection()) { 9147 case LAYOUT_DIRECTION_INHERIT: 9148 // We cannot do the resolution if there is no parent 9149 if (mParent == null) return; 9150 9151 // If this is root view, no need to look at parent's layout dir. 9152 if (mParent instanceof ViewGroup) { 9153 ViewGroup viewGroup = ((ViewGroup) mParent); 9154 9155 // Check if the parent view group can resolve 9156 if (! viewGroup.canResolveLayoutDirection()) { 9157 return; 9158 } 9159 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 9160 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9161 } 9162 } 9163 break; 9164 case LAYOUT_DIRECTION_RTL: 9165 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9166 break; 9167 case LAYOUT_DIRECTION_LOCALE: 9168 if(isLayoutDirectionRtl(Locale.getDefault())) { 9169 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9170 } 9171 break; 9172 default: 9173 // Nothing to do, LTR by default 9174 } 9175 9176 // Set to resolved 9177 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 9178 } 9179 9180 /** 9181 * @hide 9182 */ 9183 protected void resolvePadding() { 9184 // If the user specified the absolute padding (either with android:padding or 9185 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 9186 // use the default padding or the padding from the background drawable 9187 // (stored at this point in mPadding*) 9188 switch (getResolvedLayoutDirection()) { 9189 case LAYOUT_DIRECTION_RTL: 9190 // Start user padding override Right user padding. Otherwise, if Right user 9191 // padding is not defined, use the default Right padding. If Right user padding 9192 // is defined, just use it. 9193 if (mUserPaddingStart >= 0) { 9194 mUserPaddingRight = mUserPaddingStart; 9195 } else if (mUserPaddingRight < 0) { 9196 mUserPaddingRight = mPaddingRight; 9197 } 9198 if (mUserPaddingEnd >= 0) { 9199 mUserPaddingLeft = mUserPaddingEnd; 9200 } else if (mUserPaddingLeft < 0) { 9201 mUserPaddingLeft = mPaddingLeft; 9202 } 9203 break; 9204 case LAYOUT_DIRECTION_LTR: 9205 default: 9206 // Start user padding override Left user padding. Otherwise, if Left user 9207 // padding is not defined, use the default left padding. If Left user padding 9208 // is defined, just use it. 9209 if (mUserPaddingStart >= 0) { 9210 mUserPaddingLeft = mUserPaddingStart; 9211 } else if (mUserPaddingLeft < 0) { 9212 mUserPaddingLeft = mPaddingLeft; 9213 } 9214 if (mUserPaddingEnd >= 0) { 9215 mUserPaddingRight = mUserPaddingEnd; 9216 } else if (mUserPaddingRight < 0) { 9217 mUserPaddingRight = mPaddingRight; 9218 } 9219 } 9220 9221 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 9222 9223 recomputePadding(); 9224 } 9225 9226 protected boolean canResolveLayoutDirection() { 9227 switch (getLayoutDirection()) { 9228 case LAYOUT_DIRECTION_INHERIT: 9229 return (mParent != null); 9230 default: 9231 return true; 9232 } 9233 } 9234 9235 /** 9236 * Reset the resolved layout direction. 9237 * 9238 * Subclasses need to override this method to clear cached information that depends on the 9239 * resolved layout direction, or to inform child views that inherit their layout direction. 9240 * Overrides must also call the superclass implementation at the start of their implementation. 9241 * 9242 * @hide 9243 */ 9244 protected void resetResolvedLayoutDirection() { 9245 // Reset the current View resolution 9246 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED; 9247 } 9248 9249 /** 9250 * Check if a Locale is corresponding to a RTL script. 9251 * 9252 * @param locale Locale to check 9253 * @return true if a Locale is corresponding to a RTL script. 9254 */ 9255 protected static boolean isLayoutDirectionRtl(Locale locale) { 9256 return (LocaleUtil.TEXT_LAYOUT_DIRECTION_RTL_DO_NOT_USE == 9257 LocaleUtil.getLayoutDirectionFromLocale(locale)); 9258 } 9259 9260 /** 9261 * This is called when the view is detached from a window. At this point it 9262 * no longer has a surface for drawing. 9263 * 9264 * @see #onAttachedToWindow() 9265 */ 9266 protected void onDetachedFromWindow() { 9267 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 9268 9269 removeUnsetPressCallback(); 9270 removeLongPressCallback(); 9271 removePerformClickCallback(); 9272 removeSendViewScrolledAccessibilityEventCallback(); 9273 9274 destroyDrawingCache(); 9275 9276 destroyLayer(); 9277 9278 if (mDisplayList != null) { 9279 mDisplayList.invalidate(); 9280 } 9281 9282 if (mAttachInfo != null) { 9283 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 9284 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_RECT_MSG, this); 9285 } 9286 9287 mCurrentAnimation = null; 9288 9289 resetResolvedLayoutDirection(); 9290 resetResolvedTextDirection(); 9291 } 9292 9293 /** 9294 * @return The number of times this view has been attached to a window 9295 */ 9296 protected int getWindowAttachCount() { 9297 return mWindowAttachCount; 9298 } 9299 9300 /** 9301 * Retrieve a unique token identifying the window this view is attached to. 9302 * @return Return the window's token for use in 9303 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 9304 */ 9305 public IBinder getWindowToken() { 9306 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 9307 } 9308 9309 /** 9310 * Retrieve a unique token identifying the top-level "real" window of 9311 * the window that this view is attached to. That is, this is like 9312 * {@link #getWindowToken}, except if the window this view in is a panel 9313 * window (attached to another containing window), then the token of 9314 * the containing window is returned instead. 9315 * 9316 * @return Returns the associated window token, either 9317 * {@link #getWindowToken()} or the containing window's token. 9318 */ 9319 public IBinder getApplicationWindowToken() { 9320 AttachInfo ai = mAttachInfo; 9321 if (ai != null) { 9322 IBinder appWindowToken = ai.mPanelParentWindowToken; 9323 if (appWindowToken == null) { 9324 appWindowToken = ai.mWindowToken; 9325 } 9326 return appWindowToken; 9327 } 9328 return null; 9329 } 9330 9331 /** 9332 * Retrieve private session object this view hierarchy is using to 9333 * communicate with the window manager. 9334 * @return the session object to communicate with the window manager 9335 */ 9336 /*package*/ IWindowSession getWindowSession() { 9337 return mAttachInfo != null ? mAttachInfo.mSession : null; 9338 } 9339 9340 /** 9341 * @param info the {@link android.view.View.AttachInfo} to associated with 9342 * this view 9343 */ 9344 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 9345 //System.out.println("Attached! " + this); 9346 mAttachInfo = info; 9347 mWindowAttachCount++; 9348 // We will need to evaluate the drawable state at least once. 9349 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9350 if (mFloatingTreeObserver != null) { 9351 info.mTreeObserver.merge(mFloatingTreeObserver); 9352 mFloatingTreeObserver = null; 9353 } 9354 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 9355 mAttachInfo.mScrollContainers.add(this); 9356 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 9357 } 9358 performCollectViewAttributes(visibility); 9359 onAttachedToWindow(); 9360 9361 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9362 mOnAttachStateChangeListeners; 9363 if (listeners != null && listeners.size() > 0) { 9364 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9365 // perform the dispatching. The iterator is a safe guard against listeners that 9366 // could mutate the list by calling the various add/remove methods. This prevents 9367 // the array from being modified while we iterate it. 9368 for (OnAttachStateChangeListener listener : listeners) { 9369 listener.onViewAttachedToWindow(this); 9370 } 9371 } 9372 9373 int vis = info.mWindowVisibility; 9374 if (vis != GONE) { 9375 onWindowVisibilityChanged(vis); 9376 } 9377 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 9378 // If nobody has evaluated the drawable state yet, then do it now. 9379 refreshDrawableState(); 9380 } 9381 } 9382 9383 void dispatchDetachedFromWindow() { 9384 AttachInfo info = mAttachInfo; 9385 if (info != null) { 9386 int vis = info.mWindowVisibility; 9387 if (vis != GONE) { 9388 onWindowVisibilityChanged(GONE); 9389 } 9390 } 9391 9392 onDetachedFromWindow(); 9393 9394 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9395 mOnAttachStateChangeListeners; 9396 if (listeners != null && listeners.size() > 0) { 9397 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9398 // perform the dispatching. The iterator is a safe guard against listeners that 9399 // could mutate the list by calling the various add/remove methods. This prevents 9400 // the array from being modified while we iterate it. 9401 for (OnAttachStateChangeListener listener : listeners) { 9402 listener.onViewDetachedFromWindow(this); 9403 } 9404 } 9405 9406 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 9407 mAttachInfo.mScrollContainers.remove(this); 9408 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 9409 } 9410 9411 mAttachInfo = null; 9412 } 9413 9414 /** 9415 * Store this view hierarchy's frozen state into the given container. 9416 * 9417 * @param container The SparseArray in which to save the view's state. 9418 * 9419 * @see #restoreHierarchyState(android.util.SparseArray) 9420 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9421 * @see #onSaveInstanceState() 9422 */ 9423 public void saveHierarchyState(SparseArray<Parcelable> container) { 9424 dispatchSaveInstanceState(container); 9425 } 9426 9427 /** 9428 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 9429 * this view and its children. May be overridden to modify how freezing happens to a 9430 * view's children; for example, some views may want to not store state for their children. 9431 * 9432 * @param container The SparseArray in which to save the view's state. 9433 * 9434 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9435 * @see #saveHierarchyState(android.util.SparseArray) 9436 * @see #onSaveInstanceState() 9437 */ 9438 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 9439 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 9440 mPrivateFlags &= ~SAVE_STATE_CALLED; 9441 Parcelable state = onSaveInstanceState(); 9442 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9443 throw new IllegalStateException( 9444 "Derived class did not call super.onSaveInstanceState()"); 9445 } 9446 if (state != null) { 9447 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 9448 // + ": " + state); 9449 container.put(mID, state); 9450 } 9451 } 9452 } 9453 9454 /** 9455 * Hook allowing a view to generate a representation of its internal state 9456 * that can later be used to create a new instance with that same state. 9457 * This state should only contain information that is not persistent or can 9458 * not be reconstructed later. For example, you will never store your 9459 * current position on screen because that will be computed again when a 9460 * new instance of the view is placed in its view hierarchy. 9461 * <p> 9462 * Some examples of things you may store here: the current cursor position 9463 * in a text view (but usually not the text itself since that is stored in a 9464 * content provider or other persistent storage), the currently selected 9465 * item in a list view. 9466 * 9467 * @return Returns a Parcelable object containing the view's current dynamic 9468 * state, or null if there is nothing interesting to save. The 9469 * default implementation returns null. 9470 * @see #onRestoreInstanceState(android.os.Parcelable) 9471 * @see #saveHierarchyState(android.util.SparseArray) 9472 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9473 * @see #setSaveEnabled(boolean) 9474 */ 9475 protected Parcelable onSaveInstanceState() { 9476 mPrivateFlags |= SAVE_STATE_CALLED; 9477 return BaseSavedState.EMPTY_STATE; 9478 } 9479 9480 /** 9481 * Restore this view hierarchy's frozen state from the given container. 9482 * 9483 * @param container The SparseArray which holds previously frozen states. 9484 * 9485 * @see #saveHierarchyState(android.util.SparseArray) 9486 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9487 * @see #onRestoreInstanceState(android.os.Parcelable) 9488 */ 9489 public void restoreHierarchyState(SparseArray<Parcelable> container) { 9490 dispatchRestoreInstanceState(container); 9491 } 9492 9493 /** 9494 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 9495 * state for this view and its children. May be overridden to modify how restoring 9496 * happens to a view's children; for example, some views may want to not store state 9497 * for their children. 9498 * 9499 * @param container The SparseArray which holds previously saved state. 9500 * 9501 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9502 * @see #restoreHierarchyState(android.util.SparseArray) 9503 * @see #onRestoreInstanceState(android.os.Parcelable) 9504 */ 9505 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 9506 if (mID != NO_ID) { 9507 Parcelable state = container.get(mID); 9508 if (state != null) { 9509 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 9510 // + ": " + state); 9511 mPrivateFlags &= ~SAVE_STATE_CALLED; 9512 onRestoreInstanceState(state); 9513 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9514 throw new IllegalStateException( 9515 "Derived class did not call super.onRestoreInstanceState()"); 9516 } 9517 } 9518 } 9519 } 9520 9521 /** 9522 * Hook allowing a view to re-apply a representation of its internal state that had previously 9523 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 9524 * null state. 9525 * 9526 * @param state The frozen state that had previously been returned by 9527 * {@link #onSaveInstanceState}. 9528 * 9529 * @see #onSaveInstanceState() 9530 * @see #restoreHierarchyState(android.util.SparseArray) 9531 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9532 */ 9533 protected void onRestoreInstanceState(Parcelable state) { 9534 mPrivateFlags |= SAVE_STATE_CALLED; 9535 if (state != BaseSavedState.EMPTY_STATE && state != null) { 9536 throw new IllegalArgumentException("Wrong state class, expecting View State but " 9537 + "received " + state.getClass().toString() + " instead. This usually happens " 9538 + "when two views of different type have the same id in the same hierarchy. " 9539 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 9540 + "other views do not use the same id."); 9541 } 9542 } 9543 9544 /** 9545 * <p>Return the time at which the drawing of the view hierarchy started.</p> 9546 * 9547 * @return the drawing start time in milliseconds 9548 */ 9549 public long getDrawingTime() { 9550 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 9551 } 9552 9553 /** 9554 * <p>Enables or disables the duplication of the parent's state into this view. When 9555 * duplication is enabled, this view gets its drawable state from its parent rather 9556 * than from its own internal properties.</p> 9557 * 9558 * <p>Note: in the current implementation, setting this property to true after the 9559 * view was added to a ViewGroup might have no effect at all. This property should 9560 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 9561 * 9562 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 9563 * property is enabled, an exception will be thrown.</p> 9564 * 9565 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 9566 * parent, these states should not be affected by this method.</p> 9567 * 9568 * @param enabled True to enable duplication of the parent's drawable state, false 9569 * to disable it. 9570 * 9571 * @see #getDrawableState() 9572 * @see #isDuplicateParentStateEnabled() 9573 */ 9574 public void setDuplicateParentStateEnabled(boolean enabled) { 9575 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 9576 } 9577 9578 /** 9579 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 9580 * 9581 * @return True if this view's drawable state is duplicated from the parent, 9582 * false otherwise 9583 * 9584 * @see #getDrawableState() 9585 * @see #setDuplicateParentStateEnabled(boolean) 9586 */ 9587 public boolean isDuplicateParentStateEnabled() { 9588 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 9589 } 9590 9591 /** 9592 * <p>Specifies the type of layer backing this view. The layer can be 9593 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 9594 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 9595 * 9596 * <p>A layer is associated with an optional {@link android.graphics.Paint} 9597 * instance that controls how the layer is composed on screen. The following 9598 * properties of the paint are taken into account when composing the layer:</p> 9599 * <ul> 9600 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 9601 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 9602 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 9603 * </ul> 9604 * 9605 * <p>If this view has an alpha value set to < 1.0 by calling 9606 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 9607 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 9608 * equivalent to setting a hardware layer on this view and providing a paint with 9609 * the desired alpha value.<p> 9610 * 9611 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 9612 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 9613 * for more information on when and how to use layers.</p> 9614 * 9615 * @param layerType The ype of layer to use with this view, must be one of 9616 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9617 * {@link #LAYER_TYPE_HARDWARE} 9618 * @param paint The paint used to compose the layer. This argument is optional 9619 * and can be null. It is ignored when the layer type is 9620 * {@link #LAYER_TYPE_NONE} 9621 * 9622 * @see #getLayerType() 9623 * @see #LAYER_TYPE_NONE 9624 * @see #LAYER_TYPE_SOFTWARE 9625 * @see #LAYER_TYPE_HARDWARE 9626 * @see #setAlpha(float) 9627 * 9628 * @attr ref android.R.styleable#View_layerType 9629 */ 9630 public void setLayerType(int layerType, Paint paint) { 9631 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 9632 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 9633 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 9634 } 9635 9636 if (layerType == mLayerType) { 9637 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 9638 mLayerPaint = paint == null ? new Paint() : paint; 9639 invalidateParentCaches(); 9640 invalidate(true); 9641 } 9642 return; 9643 } 9644 9645 // Destroy any previous software drawing cache if needed 9646 switch (mLayerType) { 9647 case LAYER_TYPE_HARDWARE: 9648 destroyLayer(); 9649 // fall through - unaccelerated views may use software layer mechanism instead 9650 case LAYER_TYPE_SOFTWARE: 9651 destroyDrawingCache(); 9652 break; 9653 default: 9654 break; 9655 } 9656 9657 mLayerType = layerType; 9658 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 9659 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 9660 mLocalDirtyRect = layerDisabled ? null : new Rect(); 9661 9662 invalidateParentCaches(); 9663 invalidate(true); 9664 } 9665 9666 /** 9667 * Indicates what type of layer is currently associated with this view. By default 9668 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 9669 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 9670 * for more information on the different types of layers. 9671 * 9672 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9673 * {@link #LAYER_TYPE_HARDWARE} 9674 * 9675 * @see #setLayerType(int, android.graphics.Paint) 9676 * @see #buildLayer() 9677 * @see #LAYER_TYPE_NONE 9678 * @see #LAYER_TYPE_SOFTWARE 9679 * @see #LAYER_TYPE_HARDWARE 9680 */ 9681 public int getLayerType() { 9682 return mLayerType; 9683 } 9684 9685 /** 9686 * Forces this view's layer to be created and this view to be rendered 9687 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 9688 * invoking this method will have no effect. 9689 * 9690 * This method can for instance be used to render a view into its layer before 9691 * starting an animation. If this view is complex, rendering into the layer 9692 * before starting the animation will avoid skipping frames. 9693 * 9694 * @throws IllegalStateException If this view is not attached to a window 9695 * 9696 * @see #setLayerType(int, android.graphics.Paint) 9697 */ 9698 public void buildLayer() { 9699 if (mLayerType == LAYER_TYPE_NONE) return; 9700 9701 if (mAttachInfo == null) { 9702 throw new IllegalStateException("This view must be attached to a window first"); 9703 } 9704 9705 switch (mLayerType) { 9706 case LAYER_TYPE_HARDWARE: 9707 getHardwareLayer(); 9708 break; 9709 case LAYER_TYPE_SOFTWARE: 9710 buildDrawingCache(true); 9711 break; 9712 } 9713 } 9714 9715 /** 9716 * <p>Returns a hardware layer that can be used to draw this view again 9717 * without executing its draw method.</p> 9718 * 9719 * @return A HardwareLayer ready to render, or null if an error occurred. 9720 */ 9721 HardwareLayer getHardwareLayer() { 9722 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 9723 !mAttachInfo.mHardwareRenderer.isEnabled()) { 9724 return null; 9725 } 9726 9727 final int width = mRight - mLeft; 9728 final int height = mBottom - mTop; 9729 9730 if (width == 0 || height == 0) { 9731 return null; 9732 } 9733 9734 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 9735 if (mHardwareLayer == null) { 9736 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 9737 width, height, isOpaque()); 9738 mLocalDirtyRect.setEmpty(); 9739 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 9740 mHardwareLayer.resize(width, height); 9741 mLocalDirtyRect.setEmpty(); 9742 } 9743 9744 HardwareCanvas currentCanvas = mAttachInfo.mHardwareCanvas; 9745 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 9746 mAttachInfo.mHardwareCanvas = canvas; 9747 try { 9748 canvas.setViewport(width, height); 9749 canvas.onPreDraw(mLocalDirtyRect); 9750 mLocalDirtyRect.setEmpty(); 9751 9752 final int restoreCount = canvas.save(); 9753 9754 computeScroll(); 9755 canvas.translate(-mScrollX, -mScrollY); 9756 9757 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9758 9759 // Fast path for layouts with no backgrounds 9760 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9761 mPrivateFlags &= ~DIRTY_MASK; 9762 dispatchDraw(canvas); 9763 } else { 9764 draw(canvas); 9765 } 9766 9767 canvas.restoreToCount(restoreCount); 9768 } finally { 9769 canvas.onPostDraw(); 9770 mHardwareLayer.end(currentCanvas); 9771 mAttachInfo.mHardwareCanvas = currentCanvas; 9772 } 9773 } 9774 9775 return mHardwareLayer; 9776 } 9777 9778 boolean destroyLayer() { 9779 if (mHardwareLayer != null) { 9780 mHardwareLayer.destroy(); 9781 mHardwareLayer = null; 9782 return true; 9783 } 9784 return false; 9785 } 9786 9787 /** 9788 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 9789 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 9790 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 9791 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 9792 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 9793 * null.</p> 9794 * 9795 * <p>Enabling the drawing cache is similar to 9796 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 9797 * acceleration is turned off. When hardware acceleration is turned on, enabling the 9798 * drawing cache has no effect on rendering because the system uses a different mechanism 9799 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 9800 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 9801 * for information on how to enable software and hardware layers.</p> 9802 * 9803 * <p>This API can be used to manually generate 9804 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 9805 * {@link #getDrawingCache()}.</p> 9806 * 9807 * @param enabled true to enable the drawing cache, false otherwise 9808 * 9809 * @see #isDrawingCacheEnabled() 9810 * @see #getDrawingCache() 9811 * @see #buildDrawingCache() 9812 * @see #setLayerType(int, android.graphics.Paint) 9813 */ 9814 public void setDrawingCacheEnabled(boolean enabled) { 9815 mCachingFailed = false; 9816 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 9817 } 9818 9819 /** 9820 * <p>Indicates whether the drawing cache is enabled for this view.</p> 9821 * 9822 * @return true if the drawing cache is enabled 9823 * 9824 * @see #setDrawingCacheEnabled(boolean) 9825 * @see #getDrawingCache() 9826 */ 9827 @ViewDebug.ExportedProperty(category = "drawing") 9828 public boolean isDrawingCacheEnabled() { 9829 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 9830 } 9831 9832 /** 9833 * Debugging utility which recursively outputs the dirty state of a view and its 9834 * descendants. 9835 * 9836 * @hide 9837 */ 9838 @SuppressWarnings({"UnusedDeclaration"}) 9839 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 9840 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 9841 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 9842 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 9843 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 9844 if (clear) { 9845 mPrivateFlags &= clearMask; 9846 } 9847 if (this instanceof ViewGroup) { 9848 ViewGroup parent = (ViewGroup) this; 9849 final int count = parent.getChildCount(); 9850 for (int i = 0; i < count; i++) { 9851 final View child = parent.getChildAt(i); 9852 child.outputDirtyFlags(indent + " ", clear, clearMask); 9853 } 9854 } 9855 } 9856 9857 /** 9858 * This method is used by ViewGroup to cause its children to restore or recreate their 9859 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 9860 * to recreate its own display list, which would happen if it went through the normal 9861 * draw/dispatchDraw mechanisms. 9862 * 9863 * @hide 9864 */ 9865 protected void dispatchGetDisplayList() {} 9866 9867 /** 9868 * A view that is not attached or hardware accelerated cannot create a display list. 9869 * This method checks these conditions and returns the appropriate result. 9870 * 9871 * @return true if view has the ability to create a display list, false otherwise. 9872 * 9873 * @hide 9874 */ 9875 public boolean canHaveDisplayList() { 9876 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 9877 } 9878 9879 /** 9880 * <p>Returns a display list that can be used to draw this view again 9881 * without executing its draw method.</p> 9882 * 9883 * @return A DisplayList ready to replay, or null if caching is not enabled. 9884 * 9885 * @hide 9886 */ 9887 public DisplayList getDisplayList() { 9888 if (!canHaveDisplayList()) { 9889 return null; 9890 } 9891 9892 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 9893 mDisplayList == null || !mDisplayList.isValid() || 9894 mRecreateDisplayList)) { 9895 // Don't need to recreate the display list, just need to tell our 9896 // children to restore/recreate theirs 9897 if (mDisplayList != null && mDisplayList.isValid() && 9898 !mRecreateDisplayList) { 9899 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9900 mPrivateFlags &= ~DIRTY_MASK; 9901 dispatchGetDisplayList(); 9902 9903 return mDisplayList; 9904 } 9905 9906 // If we got here, we're recreating it. Mark it as such to ensure that 9907 // we copy in child display lists into ours in drawChild() 9908 mRecreateDisplayList = true; 9909 if (mDisplayList == null) { 9910 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 9911 // If we're creating a new display list, make sure our parent gets invalidated 9912 // since they will need to recreate their display list to account for this 9913 // new child display list. 9914 invalidateParentCaches(); 9915 } 9916 9917 final HardwareCanvas canvas = mDisplayList.start(); 9918 try { 9919 int width = mRight - mLeft; 9920 int height = mBottom - mTop; 9921 9922 canvas.setViewport(width, height); 9923 // The dirty rect should always be null for a display list 9924 canvas.onPreDraw(null); 9925 9926 final int restoreCount = canvas.save(); 9927 9928 computeScroll(); 9929 canvas.translate(-mScrollX, -mScrollY); 9930 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9931 mPrivateFlags &= ~DIRTY_MASK; 9932 9933 // Fast path for layouts with no backgrounds 9934 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9935 dispatchDraw(canvas); 9936 } else { 9937 draw(canvas); 9938 } 9939 9940 canvas.restoreToCount(restoreCount); 9941 } finally { 9942 canvas.onPostDraw(); 9943 9944 mDisplayList.end(); 9945 } 9946 } else { 9947 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9948 mPrivateFlags &= ~DIRTY_MASK; 9949 } 9950 9951 return mDisplayList; 9952 } 9953 9954 /** 9955 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 9956 * 9957 * @return A non-scaled bitmap representing this view or null if cache is disabled. 9958 * 9959 * @see #getDrawingCache(boolean) 9960 */ 9961 public Bitmap getDrawingCache() { 9962 return getDrawingCache(false); 9963 } 9964 9965 /** 9966 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 9967 * is null when caching is disabled. If caching is enabled and the cache is not ready, 9968 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 9969 * draw from the cache when the cache is enabled. To benefit from the cache, you must 9970 * request the drawing cache by calling this method and draw it on screen if the 9971 * returned bitmap is not null.</p> 9972 * 9973 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 9974 * this method will create a bitmap of the same size as this view. Because this bitmap 9975 * will be drawn scaled by the parent ViewGroup, the result on screen might show 9976 * scaling artifacts. To avoid such artifacts, you should call this method by setting 9977 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 9978 * size than the view. This implies that your application must be able to handle this 9979 * size.</p> 9980 * 9981 * @param autoScale Indicates whether the generated bitmap should be scaled based on 9982 * the current density of the screen when the application is in compatibility 9983 * mode. 9984 * 9985 * @return A bitmap representing this view or null if cache is disabled. 9986 * 9987 * @see #setDrawingCacheEnabled(boolean) 9988 * @see #isDrawingCacheEnabled() 9989 * @see #buildDrawingCache(boolean) 9990 * @see #destroyDrawingCache() 9991 */ 9992 public Bitmap getDrawingCache(boolean autoScale) { 9993 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 9994 return null; 9995 } 9996 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 9997 buildDrawingCache(autoScale); 9998 } 9999 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 10000 } 10001 10002 /** 10003 * <p>Frees the resources used by the drawing cache. If you call 10004 * {@link #buildDrawingCache()} manually without calling 10005 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10006 * should cleanup the cache with this method afterwards.</p> 10007 * 10008 * @see #setDrawingCacheEnabled(boolean) 10009 * @see #buildDrawingCache() 10010 * @see #getDrawingCache() 10011 */ 10012 public void destroyDrawingCache() { 10013 if (mDrawingCache != null) { 10014 mDrawingCache.recycle(); 10015 mDrawingCache = null; 10016 } 10017 if (mUnscaledDrawingCache != null) { 10018 mUnscaledDrawingCache.recycle(); 10019 mUnscaledDrawingCache = null; 10020 } 10021 } 10022 10023 /** 10024 * Setting a solid background color for the drawing cache's bitmaps will improve 10025 * perfromance and memory usage. Note, though that this should only be used if this 10026 * view will always be drawn on top of a solid color. 10027 * 10028 * @param color The background color to use for the drawing cache's bitmap 10029 * 10030 * @see #setDrawingCacheEnabled(boolean) 10031 * @see #buildDrawingCache() 10032 * @see #getDrawingCache() 10033 */ 10034 public void setDrawingCacheBackgroundColor(int color) { 10035 if (color != mDrawingCacheBackgroundColor) { 10036 mDrawingCacheBackgroundColor = color; 10037 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10038 } 10039 } 10040 10041 /** 10042 * @see #setDrawingCacheBackgroundColor(int) 10043 * 10044 * @return The background color to used for the drawing cache's bitmap 10045 */ 10046 public int getDrawingCacheBackgroundColor() { 10047 return mDrawingCacheBackgroundColor; 10048 } 10049 10050 /** 10051 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 10052 * 10053 * @see #buildDrawingCache(boolean) 10054 */ 10055 public void buildDrawingCache() { 10056 buildDrawingCache(false); 10057 } 10058 10059 /** 10060 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 10061 * 10062 * <p>If you call {@link #buildDrawingCache()} manually without calling 10063 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10064 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 10065 * 10066 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10067 * this method will create a bitmap of the same size as this view. Because this bitmap 10068 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10069 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10070 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10071 * size than the view. This implies that your application must be able to handle this 10072 * size.</p> 10073 * 10074 * <p>You should avoid calling this method when hardware acceleration is enabled. If 10075 * you do not need the drawing cache bitmap, calling this method will increase memory 10076 * usage and cause the view to be rendered in software once, thus negatively impacting 10077 * performance.</p> 10078 * 10079 * @see #getDrawingCache() 10080 * @see #destroyDrawingCache() 10081 */ 10082 public void buildDrawingCache(boolean autoScale) { 10083 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 10084 mDrawingCache == null : mUnscaledDrawingCache == null)) { 10085 mCachingFailed = false; 10086 10087 if (ViewDebug.TRACE_HIERARCHY) { 10088 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 10089 } 10090 10091 int width = mRight - mLeft; 10092 int height = mBottom - mTop; 10093 10094 final AttachInfo attachInfo = mAttachInfo; 10095 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 10096 10097 if (autoScale && scalingRequired) { 10098 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 10099 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 10100 } 10101 10102 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 10103 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 10104 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 10105 10106 if (width <= 0 || height <= 0 || 10107 // Projected bitmap size in bytes 10108 (width * height * (opaque && !use32BitCache ? 2 : 4) > 10109 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 10110 destroyDrawingCache(); 10111 mCachingFailed = true; 10112 return; 10113 } 10114 10115 boolean clear = true; 10116 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 10117 10118 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 10119 Bitmap.Config quality; 10120 if (!opaque) { 10121 // Never pick ARGB_4444 because it looks awful 10122 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 10123 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 10124 case DRAWING_CACHE_QUALITY_AUTO: 10125 quality = Bitmap.Config.ARGB_8888; 10126 break; 10127 case DRAWING_CACHE_QUALITY_LOW: 10128 quality = Bitmap.Config.ARGB_8888; 10129 break; 10130 case DRAWING_CACHE_QUALITY_HIGH: 10131 quality = Bitmap.Config.ARGB_8888; 10132 break; 10133 default: 10134 quality = Bitmap.Config.ARGB_8888; 10135 break; 10136 } 10137 } else { 10138 // Optimization for translucent windows 10139 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 10140 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 10141 } 10142 10143 // Try to cleanup memory 10144 if (bitmap != null) bitmap.recycle(); 10145 10146 try { 10147 bitmap = Bitmap.createBitmap(width, height, quality); 10148 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10149 if (autoScale) { 10150 mDrawingCache = bitmap; 10151 } else { 10152 mUnscaledDrawingCache = bitmap; 10153 } 10154 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 10155 } catch (OutOfMemoryError e) { 10156 // If there is not enough memory to create the bitmap cache, just 10157 // ignore the issue as bitmap caches are not required to draw the 10158 // view hierarchy 10159 if (autoScale) { 10160 mDrawingCache = null; 10161 } else { 10162 mUnscaledDrawingCache = null; 10163 } 10164 mCachingFailed = true; 10165 return; 10166 } 10167 10168 clear = drawingCacheBackgroundColor != 0; 10169 } 10170 10171 Canvas canvas; 10172 if (attachInfo != null) { 10173 canvas = attachInfo.mCanvas; 10174 if (canvas == null) { 10175 canvas = new Canvas(); 10176 } 10177 canvas.setBitmap(bitmap); 10178 // Temporarily clobber the cached Canvas in case one of our children 10179 // is also using a drawing cache. Without this, the children would 10180 // steal the canvas by attaching their own bitmap to it and bad, bad 10181 // thing would happen (invisible views, corrupted drawings, etc.) 10182 attachInfo.mCanvas = null; 10183 } else { 10184 // This case should hopefully never or seldom happen 10185 canvas = new Canvas(bitmap); 10186 } 10187 10188 if (clear) { 10189 bitmap.eraseColor(drawingCacheBackgroundColor); 10190 } 10191 10192 computeScroll(); 10193 final int restoreCount = canvas.save(); 10194 10195 if (autoScale && scalingRequired) { 10196 final float scale = attachInfo.mApplicationScale; 10197 canvas.scale(scale, scale); 10198 } 10199 10200 canvas.translate(-mScrollX, -mScrollY); 10201 10202 mPrivateFlags |= DRAWN; 10203 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 10204 mLayerType != LAYER_TYPE_NONE) { 10205 mPrivateFlags |= DRAWING_CACHE_VALID; 10206 } 10207 10208 // Fast path for layouts with no backgrounds 10209 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10210 if (ViewDebug.TRACE_HIERARCHY) { 10211 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10212 } 10213 mPrivateFlags &= ~DIRTY_MASK; 10214 dispatchDraw(canvas); 10215 } else { 10216 draw(canvas); 10217 } 10218 10219 canvas.restoreToCount(restoreCount); 10220 10221 if (attachInfo != null) { 10222 // Restore the cached Canvas for our siblings 10223 attachInfo.mCanvas = canvas; 10224 } 10225 } 10226 } 10227 10228 /** 10229 * Create a snapshot of the view into a bitmap. We should probably make 10230 * some form of this public, but should think about the API. 10231 */ 10232 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 10233 int width = mRight - mLeft; 10234 int height = mBottom - mTop; 10235 10236 final AttachInfo attachInfo = mAttachInfo; 10237 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 10238 width = (int) ((width * scale) + 0.5f); 10239 height = (int) ((height * scale) + 0.5f); 10240 10241 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 10242 if (bitmap == null) { 10243 throw new OutOfMemoryError(); 10244 } 10245 10246 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10247 10248 Canvas canvas; 10249 if (attachInfo != null) { 10250 canvas = attachInfo.mCanvas; 10251 if (canvas == null) { 10252 canvas = new Canvas(); 10253 } 10254 canvas.setBitmap(bitmap); 10255 // Temporarily clobber the cached Canvas in case one of our children 10256 // is also using a drawing cache. Without this, the children would 10257 // steal the canvas by attaching their own bitmap to it and bad, bad 10258 // things would happen (invisible views, corrupted drawings, etc.) 10259 attachInfo.mCanvas = null; 10260 } else { 10261 // This case should hopefully never or seldom happen 10262 canvas = new Canvas(bitmap); 10263 } 10264 10265 if ((backgroundColor & 0xff000000) != 0) { 10266 bitmap.eraseColor(backgroundColor); 10267 } 10268 10269 computeScroll(); 10270 final int restoreCount = canvas.save(); 10271 canvas.scale(scale, scale); 10272 canvas.translate(-mScrollX, -mScrollY); 10273 10274 // Temporarily remove the dirty mask 10275 int flags = mPrivateFlags; 10276 mPrivateFlags &= ~DIRTY_MASK; 10277 10278 // Fast path for layouts with no backgrounds 10279 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10280 dispatchDraw(canvas); 10281 } else { 10282 draw(canvas); 10283 } 10284 10285 mPrivateFlags = flags; 10286 10287 canvas.restoreToCount(restoreCount); 10288 10289 if (attachInfo != null) { 10290 // Restore the cached Canvas for our siblings 10291 attachInfo.mCanvas = canvas; 10292 } 10293 10294 return bitmap; 10295 } 10296 10297 /** 10298 * Indicates whether this View is currently in edit mode. A View is usually 10299 * in edit mode when displayed within a developer tool. For instance, if 10300 * this View is being drawn by a visual user interface builder, this method 10301 * should return true. 10302 * 10303 * Subclasses should check the return value of this method to provide 10304 * different behaviors if their normal behavior might interfere with the 10305 * host environment. For instance: the class spawns a thread in its 10306 * constructor, the drawing code relies on device-specific features, etc. 10307 * 10308 * This method is usually checked in the drawing code of custom widgets. 10309 * 10310 * @return True if this View is in edit mode, false otherwise. 10311 */ 10312 public boolean isInEditMode() { 10313 return false; 10314 } 10315 10316 /** 10317 * If the View draws content inside its padding and enables fading edges, 10318 * it needs to support padding offsets. Padding offsets are added to the 10319 * fading edges to extend the length of the fade so that it covers pixels 10320 * drawn inside the padding. 10321 * 10322 * Subclasses of this class should override this method if they need 10323 * to draw content inside the padding. 10324 * 10325 * @return True if padding offset must be applied, false otherwise. 10326 * 10327 * @see #getLeftPaddingOffset() 10328 * @see #getRightPaddingOffset() 10329 * @see #getTopPaddingOffset() 10330 * @see #getBottomPaddingOffset() 10331 * 10332 * @since CURRENT 10333 */ 10334 protected boolean isPaddingOffsetRequired() { 10335 return false; 10336 } 10337 10338 /** 10339 * Amount by which to extend the left fading region. Called only when 10340 * {@link #isPaddingOffsetRequired()} returns true. 10341 * 10342 * @return The left padding offset in pixels. 10343 * 10344 * @see #isPaddingOffsetRequired() 10345 * 10346 * @since CURRENT 10347 */ 10348 protected int getLeftPaddingOffset() { 10349 return 0; 10350 } 10351 10352 /** 10353 * Amount by which to extend the right fading region. Called only when 10354 * {@link #isPaddingOffsetRequired()} returns true. 10355 * 10356 * @return The right padding offset in pixels. 10357 * 10358 * @see #isPaddingOffsetRequired() 10359 * 10360 * @since CURRENT 10361 */ 10362 protected int getRightPaddingOffset() { 10363 return 0; 10364 } 10365 10366 /** 10367 * Amount by which to extend the top fading region. Called only when 10368 * {@link #isPaddingOffsetRequired()} returns true. 10369 * 10370 * @return The top padding offset in pixels. 10371 * 10372 * @see #isPaddingOffsetRequired() 10373 * 10374 * @since CURRENT 10375 */ 10376 protected int getTopPaddingOffset() { 10377 return 0; 10378 } 10379 10380 /** 10381 * Amount by which to extend the bottom fading region. Called only when 10382 * {@link #isPaddingOffsetRequired()} returns true. 10383 * 10384 * @return The bottom padding offset in pixels. 10385 * 10386 * @see #isPaddingOffsetRequired() 10387 * 10388 * @since CURRENT 10389 */ 10390 protected int getBottomPaddingOffset() { 10391 return 0; 10392 } 10393 10394 /** 10395 * @hide 10396 * @param offsetRequired 10397 */ 10398 protected int getFadeTop(boolean offsetRequired) { 10399 int top = mPaddingTop; 10400 if (offsetRequired) top += getTopPaddingOffset(); 10401 return top; 10402 } 10403 10404 /** 10405 * @hide 10406 * @param offsetRequired 10407 */ 10408 protected int getFadeHeight(boolean offsetRequired) { 10409 int padding = mPaddingTop; 10410 if (offsetRequired) padding += getTopPaddingOffset(); 10411 return mBottom - mTop - mPaddingBottom - padding; 10412 } 10413 10414 /** 10415 * <p>Indicates whether this view is attached to an hardware accelerated 10416 * window or not.</p> 10417 * 10418 * <p>Even if this method returns true, it does not mean that every call 10419 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 10420 * accelerated {@link android.graphics.Canvas}. For instance, if this view 10421 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 10422 * window is hardware accelerated, 10423 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 10424 * return false, and this method will return true.</p> 10425 * 10426 * @return True if the view is attached to a window and the window is 10427 * hardware accelerated; false in any other case. 10428 */ 10429 public boolean isHardwareAccelerated() { 10430 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 10431 } 10432 10433 /** 10434 * Manually render this view (and all of its children) to the given Canvas. 10435 * The view must have already done a full layout before this function is 10436 * called. When implementing a view, implement 10437 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 10438 * If you do need to override this method, call the superclass version. 10439 * 10440 * @param canvas The Canvas to which the View is rendered. 10441 */ 10442 public void draw(Canvas canvas) { 10443 if (ViewDebug.TRACE_HIERARCHY) { 10444 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10445 } 10446 10447 final int privateFlags = mPrivateFlags; 10448 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 10449 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 10450 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 10451 10452 /* 10453 * Draw traversal performs several drawing steps which must be executed 10454 * in the appropriate order: 10455 * 10456 * 1. Draw the background 10457 * 2. If necessary, save the canvas' layers to prepare for fading 10458 * 3. Draw view's content 10459 * 4. Draw children 10460 * 5. If necessary, draw the fading edges and restore layers 10461 * 6. Draw decorations (scrollbars for instance) 10462 */ 10463 10464 // Step 1, draw the background, if needed 10465 int saveCount; 10466 10467 if (!dirtyOpaque) { 10468 final Drawable background = mBGDrawable; 10469 if (background != null) { 10470 final int scrollX = mScrollX; 10471 final int scrollY = mScrollY; 10472 10473 if (mBackgroundSizeChanged) { 10474 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 10475 mBackgroundSizeChanged = false; 10476 } 10477 10478 if ((scrollX | scrollY) == 0) { 10479 background.draw(canvas); 10480 } else { 10481 canvas.translate(scrollX, scrollY); 10482 background.draw(canvas); 10483 canvas.translate(-scrollX, -scrollY); 10484 } 10485 } 10486 } 10487 10488 // skip step 2 & 5 if possible (common case) 10489 final int viewFlags = mViewFlags; 10490 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 10491 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 10492 if (!verticalEdges && !horizontalEdges) { 10493 // Step 3, draw the content 10494 if (!dirtyOpaque) onDraw(canvas); 10495 10496 // Step 4, draw the children 10497 dispatchDraw(canvas); 10498 10499 // Step 6, draw decorations (scrollbars) 10500 onDrawScrollBars(canvas); 10501 10502 // we're done... 10503 return; 10504 } 10505 10506 /* 10507 * Here we do the full fledged routine... 10508 * (this is an uncommon case where speed matters less, 10509 * this is why we repeat some of the tests that have been 10510 * done above) 10511 */ 10512 10513 boolean drawTop = false; 10514 boolean drawBottom = false; 10515 boolean drawLeft = false; 10516 boolean drawRight = false; 10517 10518 float topFadeStrength = 0.0f; 10519 float bottomFadeStrength = 0.0f; 10520 float leftFadeStrength = 0.0f; 10521 float rightFadeStrength = 0.0f; 10522 10523 // Step 2, save the canvas' layers 10524 int paddingLeft = mPaddingLeft; 10525 10526 final boolean offsetRequired = isPaddingOffsetRequired(); 10527 if (offsetRequired) { 10528 paddingLeft += getLeftPaddingOffset(); 10529 } 10530 10531 int left = mScrollX + paddingLeft; 10532 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 10533 int top = mScrollY + getFadeTop(offsetRequired); 10534 int bottom = top + getFadeHeight(offsetRequired); 10535 10536 if (offsetRequired) { 10537 right += getRightPaddingOffset(); 10538 bottom += getBottomPaddingOffset(); 10539 } 10540 10541 final ScrollabilityCache scrollabilityCache = mScrollCache; 10542 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 10543 int length = (int) fadeHeight; 10544 10545 // clip the fade length if top and bottom fades overlap 10546 // overlapping fades produce odd-looking artifacts 10547 if (verticalEdges && (top + length > bottom - length)) { 10548 length = (bottom - top) / 2; 10549 } 10550 10551 // also clip horizontal fades if necessary 10552 if (horizontalEdges && (left + length > right - length)) { 10553 length = (right - left) / 2; 10554 } 10555 10556 if (verticalEdges) { 10557 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 10558 drawTop = topFadeStrength * fadeHeight > 1.0f; 10559 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 10560 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 10561 } 10562 10563 if (horizontalEdges) { 10564 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 10565 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 10566 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 10567 drawRight = rightFadeStrength * fadeHeight > 1.0f; 10568 } 10569 10570 saveCount = canvas.getSaveCount(); 10571 10572 int solidColor = getSolidColor(); 10573 if (solidColor == 0) { 10574 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 10575 10576 if (drawTop) { 10577 canvas.saveLayer(left, top, right, top + length, null, flags); 10578 } 10579 10580 if (drawBottom) { 10581 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 10582 } 10583 10584 if (drawLeft) { 10585 canvas.saveLayer(left, top, left + length, bottom, null, flags); 10586 } 10587 10588 if (drawRight) { 10589 canvas.saveLayer(right - length, top, right, bottom, null, flags); 10590 } 10591 } else { 10592 scrollabilityCache.setFadeColor(solidColor); 10593 } 10594 10595 // Step 3, draw the content 10596 if (!dirtyOpaque) onDraw(canvas); 10597 10598 // Step 4, draw the children 10599 dispatchDraw(canvas); 10600 10601 // Step 5, draw the fade effect and restore layers 10602 final Paint p = scrollabilityCache.paint; 10603 final Matrix matrix = scrollabilityCache.matrix; 10604 final Shader fade = scrollabilityCache.shader; 10605 10606 if (drawTop) { 10607 matrix.setScale(1, fadeHeight * topFadeStrength); 10608 matrix.postTranslate(left, top); 10609 fade.setLocalMatrix(matrix); 10610 canvas.drawRect(left, top, right, top + length, p); 10611 } 10612 10613 if (drawBottom) { 10614 matrix.setScale(1, fadeHeight * bottomFadeStrength); 10615 matrix.postRotate(180); 10616 matrix.postTranslate(left, bottom); 10617 fade.setLocalMatrix(matrix); 10618 canvas.drawRect(left, bottom - length, right, bottom, p); 10619 } 10620 10621 if (drawLeft) { 10622 matrix.setScale(1, fadeHeight * leftFadeStrength); 10623 matrix.postRotate(-90); 10624 matrix.postTranslate(left, top); 10625 fade.setLocalMatrix(matrix); 10626 canvas.drawRect(left, top, left + length, bottom, p); 10627 } 10628 10629 if (drawRight) { 10630 matrix.setScale(1, fadeHeight * rightFadeStrength); 10631 matrix.postRotate(90); 10632 matrix.postTranslate(right, top); 10633 fade.setLocalMatrix(matrix); 10634 canvas.drawRect(right - length, top, right, bottom, p); 10635 } 10636 10637 canvas.restoreToCount(saveCount); 10638 10639 // Step 6, draw decorations (scrollbars) 10640 onDrawScrollBars(canvas); 10641 } 10642 10643 /** 10644 * Override this if your view is known to always be drawn on top of a solid color background, 10645 * and needs to draw fading edges. Returning a non-zero color enables the view system to 10646 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 10647 * should be set to 0xFF. 10648 * 10649 * @see #setVerticalFadingEdgeEnabled(boolean) 10650 * @see #setHorizontalFadingEdgeEnabled(boolean) 10651 * 10652 * @return The known solid color background for this view, or 0 if the color may vary 10653 */ 10654 @ViewDebug.ExportedProperty(category = "drawing") 10655 public int getSolidColor() { 10656 return 0; 10657 } 10658 10659 /** 10660 * Build a human readable string representation of the specified view flags. 10661 * 10662 * @param flags the view flags to convert to a string 10663 * @return a String representing the supplied flags 10664 */ 10665 private static String printFlags(int flags) { 10666 String output = ""; 10667 int numFlags = 0; 10668 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 10669 output += "TAKES_FOCUS"; 10670 numFlags++; 10671 } 10672 10673 switch (flags & VISIBILITY_MASK) { 10674 case INVISIBLE: 10675 if (numFlags > 0) { 10676 output += " "; 10677 } 10678 output += "INVISIBLE"; 10679 // USELESS HERE numFlags++; 10680 break; 10681 case GONE: 10682 if (numFlags > 0) { 10683 output += " "; 10684 } 10685 output += "GONE"; 10686 // USELESS HERE numFlags++; 10687 break; 10688 default: 10689 break; 10690 } 10691 return output; 10692 } 10693 10694 /** 10695 * Build a human readable string representation of the specified private 10696 * view flags. 10697 * 10698 * @param privateFlags the private view flags to convert to a string 10699 * @return a String representing the supplied flags 10700 */ 10701 private static String printPrivateFlags(int privateFlags) { 10702 String output = ""; 10703 int numFlags = 0; 10704 10705 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 10706 output += "WANTS_FOCUS"; 10707 numFlags++; 10708 } 10709 10710 if ((privateFlags & FOCUSED) == FOCUSED) { 10711 if (numFlags > 0) { 10712 output += " "; 10713 } 10714 output += "FOCUSED"; 10715 numFlags++; 10716 } 10717 10718 if ((privateFlags & SELECTED) == SELECTED) { 10719 if (numFlags > 0) { 10720 output += " "; 10721 } 10722 output += "SELECTED"; 10723 numFlags++; 10724 } 10725 10726 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 10727 if (numFlags > 0) { 10728 output += " "; 10729 } 10730 output += "IS_ROOT_NAMESPACE"; 10731 numFlags++; 10732 } 10733 10734 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 10735 if (numFlags > 0) { 10736 output += " "; 10737 } 10738 output += "HAS_BOUNDS"; 10739 numFlags++; 10740 } 10741 10742 if ((privateFlags & DRAWN) == DRAWN) { 10743 if (numFlags > 0) { 10744 output += " "; 10745 } 10746 output += "DRAWN"; 10747 // USELESS HERE numFlags++; 10748 } 10749 return output; 10750 } 10751 10752 /** 10753 * <p>Indicates whether or not this view's layout will be requested during 10754 * the next hierarchy layout pass.</p> 10755 * 10756 * @return true if the layout will be forced during next layout pass 10757 */ 10758 public boolean isLayoutRequested() { 10759 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 10760 } 10761 10762 /** 10763 * Assign a size and position to a view and all of its 10764 * descendants 10765 * 10766 * <p>This is the second phase of the layout mechanism. 10767 * (The first is measuring). In this phase, each parent calls 10768 * layout on all of its children to position them. 10769 * This is typically done using the child measurements 10770 * that were stored in the measure pass().</p> 10771 * 10772 * <p>Derived classes should not override this method. 10773 * Derived classes with children should override 10774 * onLayout. In that method, they should 10775 * call layout on each of their children.</p> 10776 * 10777 * @param l Left position, relative to parent 10778 * @param t Top position, relative to parent 10779 * @param r Right position, relative to parent 10780 * @param b Bottom position, relative to parent 10781 */ 10782 @SuppressWarnings({"unchecked"}) 10783 public void layout(int l, int t, int r, int b) { 10784 int oldL = mLeft; 10785 int oldT = mTop; 10786 int oldB = mBottom; 10787 int oldR = mRight; 10788 boolean changed = setFrame(l, t, r, b); 10789 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 10790 if (ViewDebug.TRACE_HIERARCHY) { 10791 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 10792 } 10793 10794 onLayout(changed, l, t, r, b); 10795 mPrivateFlags &= ~LAYOUT_REQUIRED; 10796 10797 if (mOnLayoutChangeListeners != null) { 10798 ArrayList<OnLayoutChangeListener> listenersCopy = 10799 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 10800 int numListeners = listenersCopy.size(); 10801 for (int i = 0; i < numListeners; ++i) { 10802 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 10803 } 10804 } 10805 } 10806 mPrivateFlags &= ~FORCE_LAYOUT; 10807 } 10808 10809 /** 10810 * Called from layout when this view should 10811 * assign a size and position to each of its children. 10812 * 10813 * Derived classes with children should override 10814 * this method and call layout on each of 10815 * their children. 10816 * @param changed This is a new size or position for this view 10817 * @param left Left position, relative to parent 10818 * @param top Top position, relative to parent 10819 * @param right Right position, relative to parent 10820 * @param bottom Bottom position, relative to parent 10821 */ 10822 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 10823 } 10824 10825 /** 10826 * Assign a size and position to this view. 10827 * 10828 * This is called from layout. 10829 * 10830 * @param left Left position, relative to parent 10831 * @param top Top position, relative to parent 10832 * @param right Right position, relative to parent 10833 * @param bottom Bottom position, relative to parent 10834 * @return true if the new size and position are different than the 10835 * previous ones 10836 * {@hide} 10837 */ 10838 protected boolean setFrame(int left, int top, int right, int bottom) { 10839 boolean changed = false; 10840 10841 if (DBG) { 10842 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 10843 + right + "," + bottom + ")"); 10844 } 10845 10846 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 10847 changed = true; 10848 10849 // Remember our drawn bit 10850 int drawn = mPrivateFlags & DRAWN; 10851 10852 int oldWidth = mRight - mLeft; 10853 int oldHeight = mBottom - mTop; 10854 int newWidth = right - left; 10855 int newHeight = bottom - top; 10856 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 10857 10858 // Invalidate our old position 10859 invalidate(sizeChanged); 10860 10861 mLeft = left; 10862 mTop = top; 10863 mRight = right; 10864 mBottom = bottom; 10865 10866 mPrivateFlags |= HAS_BOUNDS; 10867 10868 10869 if (sizeChanged) { 10870 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 10871 // A change in dimension means an auto-centered pivot point changes, too 10872 mMatrixDirty = true; 10873 } 10874 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 10875 } 10876 10877 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 10878 // If we are visible, force the DRAWN bit to on so that 10879 // this invalidate will go through (at least to our parent). 10880 // This is because someone may have invalidated this view 10881 // before this call to setFrame came in, thereby clearing 10882 // the DRAWN bit. 10883 mPrivateFlags |= DRAWN; 10884 invalidate(sizeChanged); 10885 // parent display list may need to be recreated based on a change in the bounds 10886 // of any child 10887 invalidateParentCaches(); 10888 } 10889 10890 // Reset drawn bit to original value (invalidate turns it off) 10891 mPrivateFlags |= drawn; 10892 10893 mBackgroundSizeChanged = true; 10894 } 10895 return changed; 10896 } 10897 10898 /** 10899 * Finalize inflating a view from XML. This is called as the last phase 10900 * of inflation, after all child views have been added. 10901 * 10902 * <p>Even if the subclass overrides onFinishInflate, they should always be 10903 * sure to call the super method, so that we get called. 10904 */ 10905 protected void onFinishInflate() { 10906 } 10907 10908 /** 10909 * Returns the resources associated with this view. 10910 * 10911 * @return Resources object. 10912 */ 10913 public Resources getResources() { 10914 return mResources; 10915 } 10916 10917 /** 10918 * Invalidates the specified Drawable. 10919 * 10920 * @param drawable the drawable to invalidate 10921 */ 10922 public void invalidateDrawable(Drawable drawable) { 10923 if (verifyDrawable(drawable)) { 10924 final Rect dirty = drawable.getBounds(); 10925 final int scrollX = mScrollX; 10926 final int scrollY = mScrollY; 10927 10928 invalidate(dirty.left + scrollX, dirty.top + scrollY, 10929 dirty.right + scrollX, dirty.bottom + scrollY); 10930 } 10931 } 10932 10933 /** 10934 * Schedules an action on a drawable to occur at a specified time. 10935 * 10936 * @param who the recipient of the action 10937 * @param what the action to run on the drawable 10938 * @param when the time at which the action must occur. Uses the 10939 * {@link SystemClock#uptimeMillis} timebase. 10940 */ 10941 public void scheduleDrawable(Drawable who, Runnable what, long when) { 10942 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 10943 mAttachInfo.mHandler.postAtTime(what, who, when); 10944 } 10945 } 10946 10947 /** 10948 * Cancels a scheduled action on a drawable. 10949 * 10950 * @param who the recipient of the action 10951 * @param what the action to cancel 10952 */ 10953 public void unscheduleDrawable(Drawable who, Runnable what) { 10954 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 10955 mAttachInfo.mHandler.removeCallbacks(what, who); 10956 } 10957 } 10958 10959 /** 10960 * Unschedule any events associated with the given Drawable. This can be 10961 * used when selecting a new Drawable into a view, so that the previous 10962 * one is completely unscheduled. 10963 * 10964 * @param who The Drawable to unschedule. 10965 * 10966 * @see #drawableStateChanged 10967 */ 10968 public void unscheduleDrawable(Drawable who) { 10969 if (mAttachInfo != null) { 10970 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 10971 } 10972 } 10973 10974 /** 10975 * Return the layout direction of a given Drawable. 10976 * 10977 * @param who the Drawable to query 10978 * 10979 * @hide 10980 */ 10981 public int getResolvedLayoutDirection(Drawable who) { 10982 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 10983 } 10984 10985 /** 10986 * If your view subclass is displaying its own Drawable objects, it should 10987 * override this function and return true for any Drawable it is 10988 * displaying. This allows animations for those drawables to be 10989 * scheduled. 10990 * 10991 * <p>Be sure to call through to the super class when overriding this 10992 * function. 10993 * 10994 * @param who The Drawable to verify. Return true if it is one you are 10995 * displaying, else return the result of calling through to the 10996 * super class. 10997 * 10998 * @return boolean If true than the Drawable is being displayed in the 10999 * view; else false and it is not allowed to animate. 11000 * 11001 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 11002 * @see #drawableStateChanged() 11003 */ 11004 protected boolean verifyDrawable(Drawable who) { 11005 return who == mBGDrawable; 11006 } 11007 11008 /** 11009 * This function is called whenever the state of the view changes in such 11010 * a way that it impacts the state of drawables being shown. 11011 * 11012 * <p>Be sure to call through to the superclass when overriding this 11013 * function. 11014 * 11015 * @see Drawable#setState(int[]) 11016 */ 11017 protected void drawableStateChanged() { 11018 Drawable d = mBGDrawable; 11019 if (d != null && d.isStateful()) { 11020 d.setState(getDrawableState()); 11021 } 11022 } 11023 11024 /** 11025 * Call this to force a view to update its drawable state. This will cause 11026 * drawableStateChanged to be called on this view. Views that are interested 11027 * in the new state should call getDrawableState. 11028 * 11029 * @see #drawableStateChanged 11030 * @see #getDrawableState 11031 */ 11032 public void refreshDrawableState() { 11033 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11034 drawableStateChanged(); 11035 11036 ViewParent parent = mParent; 11037 if (parent != null) { 11038 parent.childDrawableStateChanged(this); 11039 } 11040 } 11041 11042 /** 11043 * Return an array of resource IDs of the drawable states representing the 11044 * current state of the view. 11045 * 11046 * @return The current drawable state 11047 * 11048 * @see Drawable#setState(int[]) 11049 * @see #drawableStateChanged() 11050 * @see #onCreateDrawableState(int) 11051 */ 11052 public final int[] getDrawableState() { 11053 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 11054 return mDrawableState; 11055 } else { 11056 mDrawableState = onCreateDrawableState(0); 11057 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 11058 return mDrawableState; 11059 } 11060 } 11061 11062 /** 11063 * Generate the new {@link android.graphics.drawable.Drawable} state for 11064 * this view. This is called by the view 11065 * system when the cached Drawable state is determined to be invalid. To 11066 * retrieve the current state, you should use {@link #getDrawableState}. 11067 * 11068 * @param extraSpace if non-zero, this is the number of extra entries you 11069 * would like in the returned array in which you can place your own 11070 * states. 11071 * 11072 * @return Returns an array holding the current {@link Drawable} state of 11073 * the view. 11074 * 11075 * @see #mergeDrawableStates(int[], int[]) 11076 */ 11077 protected int[] onCreateDrawableState(int extraSpace) { 11078 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 11079 mParent instanceof View) { 11080 return ((View) mParent).onCreateDrawableState(extraSpace); 11081 } 11082 11083 int[] drawableState; 11084 11085 int privateFlags = mPrivateFlags; 11086 11087 int viewStateIndex = 0; 11088 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 11089 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 11090 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 11091 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 11092 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 11093 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 11094 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 11095 HardwareRenderer.isAvailable()) { 11096 // This is set if HW acceleration is requested, even if the current 11097 // process doesn't allow it. This is just to allow app preview 11098 // windows to better match their app. 11099 viewStateIndex |= VIEW_STATE_ACCELERATED; 11100 } 11101 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 11102 11103 final int privateFlags2 = mPrivateFlags2; 11104 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 11105 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 11106 11107 drawableState = VIEW_STATE_SETS[viewStateIndex]; 11108 11109 //noinspection ConstantIfStatement 11110 if (false) { 11111 Log.i("View", "drawableStateIndex=" + viewStateIndex); 11112 Log.i("View", toString() 11113 + " pressed=" + ((privateFlags & PRESSED) != 0) 11114 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 11115 + " fo=" + hasFocus() 11116 + " sl=" + ((privateFlags & SELECTED) != 0) 11117 + " wf=" + hasWindowFocus() 11118 + ": " + Arrays.toString(drawableState)); 11119 } 11120 11121 if (extraSpace == 0) { 11122 return drawableState; 11123 } 11124 11125 final int[] fullState; 11126 if (drawableState != null) { 11127 fullState = new int[drawableState.length + extraSpace]; 11128 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 11129 } else { 11130 fullState = new int[extraSpace]; 11131 } 11132 11133 return fullState; 11134 } 11135 11136 /** 11137 * Merge your own state values in <var>additionalState</var> into the base 11138 * state values <var>baseState</var> that were returned by 11139 * {@link #onCreateDrawableState(int)}. 11140 * 11141 * @param baseState The base state values returned by 11142 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 11143 * own additional state values. 11144 * 11145 * @param additionalState The additional state values you would like 11146 * added to <var>baseState</var>; this array is not modified. 11147 * 11148 * @return As a convenience, the <var>baseState</var> array you originally 11149 * passed into the function is returned. 11150 * 11151 * @see #onCreateDrawableState(int) 11152 */ 11153 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 11154 final int N = baseState.length; 11155 int i = N - 1; 11156 while (i >= 0 && baseState[i] == 0) { 11157 i--; 11158 } 11159 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 11160 return baseState; 11161 } 11162 11163 /** 11164 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 11165 * on all Drawable objects associated with this view. 11166 */ 11167 public void jumpDrawablesToCurrentState() { 11168 if (mBGDrawable != null) { 11169 mBGDrawable.jumpToCurrentState(); 11170 } 11171 } 11172 11173 /** 11174 * Sets the background color for this view. 11175 * @param color the color of the background 11176 */ 11177 @RemotableViewMethod 11178 public void setBackgroundColor(int color) { 11179 if (mBGDrawable instanceof ColorDrawable) { 11180 ((ColorDrawable) mBGDrawable).setColor(color); 11181 } else { 11182 setBackgroundDrawable(new ColorDrawable(color)); 11183 } 11184 } 11185 11186 /** 11187 * Set the background to a given resource. The resource should refer to 11188 * a Drawable object or 0 to remove the background. 11189 * @param resid The identifier of the resource. 11190 * @attr ref android.R.styleable#View_background 11191 */ 11192 @RemotableViewMethod 11193 public void setBackgroundResource(int resid) { 11194 if (resid != 0 && resid == mBackgroundResource) { 11195 return; 11196 } 11197 11198 Drawable d= null; 11199 if (resid != 0) { 11200 d = mResources.getDrawable(resid); 11201 } 11202 setBackgroundDrawable(d); 11203 11204 mBackgroundResource = resid; 11205 } 11206 11207 /** 11208 * Set the background to a given Drawable, or remove the background. If the 11209 * background has padding, this View's padding is set to the background's 11210 * padding. However, when a background is removed, this View's padding isn't 11211 * touched. If setting the padding is desired, please use 11212 * {@link #setPadding(int, int, int, int)}. 11213 * 11214 * @param d The Drawable to use as the background, or null to remove the 11215 * background 11216 */ 11217 public void setBackgroundDrawable(Drawable d) { 11218 if (d == mBGDrawable) { 11219 return; 11220 } 11221 11222 boolean requestLayout = false; 11223 11224 mBackgroundResource = 0; 11225 11226 /* 11227 * Regardless of whether we're setting a new background or not, we want 11228 * to clear the previous drawable. 11229 */ 11230 if (mBGDrawable != null) { 11231 mBGDrawable.setCallback(null); 11232 unscheduleDrawable(mBGDrawable); 11233 } 11234 11235 if (d != null) { 11236 Rect padding = sThreadLocal.get(); 11237 if (padding == null) { 11238 padding = new Rect(); 11239 sThreadLocal.set(padding); 11240 } 11241 if (d.getPadding(padding)) { 11242 switch (d.getResolvedLayoutDirectionSelf()) { 11243 case LAYOUT_DIRECTION_RTL: 11244 setPadding(padding.right, padding.top, padding.left, padding.bottom); 11245 break; 11246 case LAYOUT_DIRECTION_LTR: 11247 default: 11248 setPadding(padding.left, padding.top, padding.right, padding.bottom); 11249 } 11250 } 11251 11252 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 11253 // if it has a different minimum size, we should layout again 11254 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 11255 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 11256 requestLayout = true; 11257 } 11258 11259 d.setCallback(this); 11260 if (d.isStateful()) { 11261 d.setState(getDrawableState()); 11262 } 11263 d.setVisible(getVisibility() == VISIBLE, false); 11264 mBGDrawable = d; 11265 11266 if ((mPrivateFlags & SKIP_DRAW) != 0) { 11267 mPrivateFlags &= ~SKIP_DRAW; 11268 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 11269 requestLayout = true; 11270 } 11271 } else { 11272 /* Remove the background */ 11273 mBGDrawable = null; 11274 11275 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 11276 /* 11277 * This view ONLY drew the background before and we're removing 11278 * the background, so now it won't draw anything 11279 * (hence we SKIP_DRAW) 11280 */ 11281 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 11282 mPrivateFlags |= SKIP_DRAW; 11283 } 11284 11285 /* 11286 * When the background is set, we try to apply its padding to this 11287 * View. When the background is removed, we don't touch this View's 11288 * padding. This is noted in the Javadocs. Hence, we don't need to 11289 * requestLayout(), the invalidate() below is sufficient. 11290 */ 11291 11292 // The old background's minimum size could have affected this 11293 // View's layout, so let's requestLayout 11294 requestLayout = true; 11295 } 11296 11297 computeOpaqueFlags(); 11298 11299 if (requestLayout) { 11300 requestLayout(); 11301 } 11302 11303 mBackgroundSizeChanged = true; 11304 invalidate(true); 11305 } 11306 11307 /** 11308 * Gets the background drawable 11309 * @return The drawable used as the background for this view, if any. 11310 */ 11311 public Drawable getBackground() { 11312 return mBGDrawable; 11313 } 11314 11315 /** 11316 * Sets the padding. The view may add on the space required to display 11317 * the scrollbars, depending on the style and visibility of the scrollbars. 11318 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 11319 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 11320 * from the values set in this call. 11321 * 11322 * @attr ref android.R.styleable#View_padding 11323 * @attr ref android.R.styleable#View_paddingBottom 11324 * @attr ref android.R.styleable#View_paddingLeft 11325 * @attr ref android.R.styleable#View_paddingRight 11326 * @attr ref android.R.styleable#View_paddingTop 11327 * @param left the left padding in pixels 11328 * @param top the top padding in pixels 11329 * @param right the right padding in pixels 11330 * @param bottom the bottom padding in pixels 11331 */ 11332 public void setPadding(int left, int top, int right, int bottom) { 11333 boolean changed = false; 11334 11335 mUserPaddingRelative = false; 11336 11337 mUserPaddingLeft = left; 11338 mUserPaddingRight = right; 11339 mUserPaddingBottom = bottom; 11340 11341 final int viewFlags = mViewFlags; 11342 11343 // Common case is there are no scroll bars. 11344 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 11345 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 11346 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 11347 ? 0 : getVerticalScrollbarWidth(); 11348 switch (mVerticalScrollbarPosition) { 11349 case SCROLLBAR_POSITION_DEFAULT: 11350 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11351 left += offset; 11352 } else { 11353 right += offset; 11354 } 11355 break; 11356 case SCROLLBAR_POSITION_RIGHT: 11357 right += offset; 11358 break; 11359 case SCROLLBAR_POSITION_LEFT: 11360 left += offset; 11361 break; 11362 } 11363 } 11364 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 11365 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 11366 ? 0 : getHorizontalScrollbarHeight(); 11367 } 11368 } 11369 11370 if (mPaddingLeft != left) { 11371 changed = true; 11372 mPaddingLeft = left; 11373 } 11374 if (mPaddingTop != top) { 11375 changed = true; 11376 mPaddingTop = top; 11377 } 11378 if (mPaddingRight != right) { 11379 changed = true; 11380 mPaddingRight = right; 11381 } 11382 if (mPaddingBottom != bottom) { 11383 changed = true; 11384 mPaddingBottom = bottom; 11385 } 11386 11387 if (changed) { 11388 requestLayout(); 11389 } 11390 } 11391 11392 /** 11393 * Sets the relative padding. The view may add on the space required to display 11394 * the scrollbars, depending on the style and visibility of the scrollbars. 11395 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 11396 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 11397 * from the values set in this call. 11398 * 11399 * @attr ref android.R.styleable#View_padding 11400 * @attr ref android.R.styleable#View_paddingBottom 11401 * @attr ref android.R.styleable#View_paddingStart 11402 * @attr ref android.R.styleable#View_paddingEnd 11403 * @attr ref android.R.styleable#View_paddingTop 11404 * @param start the start padding in pixels 11405 * @param top the top padding in pixels 11406 * @param end the end padding in pixels 11407 * @param bottom the bottom padding in pixels 11408 * 11409 * @hide 11410 */ 11411 public void setPaddingRelative(int start, int top, int end, int bottom) { 11412 mUserPaddingRelative = true; 11413 11414 mUserPaddingStart = start; 11415 mUserPaddingEnd = end; 11416 11417 switch(getResolvedLayoutDirection()) { 11418 case LAYOUT_DIRECTION_RTL: 11419 setPadding(end, top, start, bottom); 11420 break; 11421 case LAYOUT_DIRECTION_LTR: 11422 default: 11423 setPadding(start, top, end, bottom); 11424 } 11425 } 11426 11427 /** 11428 * Returns the top padding of this view. 11429 * 11430 * @return the top padding in pixels 11431 */ 11432 public int getPaddingTop() { 11433 return mPaddingTop; 11434 } 11435 11436 /** 11437 * Returns the bottom padding of this view. If there are inset and enabled 11438 * scrollbars, this value may include the space required to display the 11439 * scrollbars as well. 11440 * 11441 * @return the bottom padding in pixels 11442 */ 11443 public int getPaddingBottom() { 11444 return mPaddingBottom; 11445 } 11446 11447 /** 11448 * Returns the left padding of this view. If there are inset and enabled 11449 * scrollbars, this value may include the space required to display the 11450 * scrollbars as well. 11451 * 11452 * @return the left padding in pixels 11453 */ 11454 public int getPaddingLeft() { 11455 return mPaddingLeft; 11456 } 11457 11458 /** 11459 * Returns the start padding of this view. If there are inset and enabled 11460 * scrollbars, this value may include the space required to display the 11461 * scrollbars as well. 11462 * 11463 * @return the start padding in pixels 11464 * 11465 * @hide 11466 */ 11467 public int getPaddingStart() { 11468 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11469 mPaddingRight : mPaddingLeft; 11470 } 11471 11472 /** 11473 * Returns the right padding of this view. If there are inset and enabled 11474 * scrollbars, this value may include the space required to display the 11475 * scrollbars as well. 11476 * 11477 * @return the right padding in pixels 11478 */ 11479 public int getPaddingRight() { 11480 return mPaddingRight; 11481 } 11482 11483 /** 11484 * Returns the end padding of this view. If there are inset and enabled 11485 * scrollbars, this value may include the space required to display the 11486 * scrollbars as well. 11487 * 11488 * @return the end padding in pixels 11489 * 11490 * @hide 11491 */ 11492 public int getPaddingEnd() { 11493 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11494 mPaddingLeft : mPaddingRight; 11495 } 11496 11497 /** 11498 * Return if the padding as been set thru relative values 11499 * {@link #setPaddingRelative(int, int, int, int)} or thru 11500 * @attr ref android.R.styleable#View_paddingStart or 11501 * @attr ref android.R.styleable#View_paddingEnd 11502 * 11503 * @return true if the padding is relative or false if it is not. 11504 * 11505 * @hide 11506 */ 11507 public boolean isPaddingRelative() { 11508 return mUserPaddingRelative; 11509 } 11510 11511 /** 11512 * Changes the selection state of this view. A view can be selected or not. 11513 * Note that selection is not the same as focus. Views are typically 11514 * selected in the context of an AdapterView like ListView or GridView; 11515 * the selected view is the view that is highlighted. 11516 * 11517 * @param selected true if the view must be selected, false otherwise 11518 */ 11519 public void setSelected(boolean selected) { 11520 if (((mPrivateFlags & SELECTED) != 0) != selected) { 11521 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 11522 if (!selected) resetPressedState(); 11523 invalidate(true); 11524 refreshDrawableState(); 11525 dispatchSetSelected(selected); 11526 } 11527 } 11528 11529 /** 11530 * Dispatch setSelected to all of this View's children. 11531 * 11532 * @see #setSelected(boolean) 11533 * 11534 * @param selected The new selected state 11535 */ 11536 protected void dispatchSetSelected(boolean selected) { 11537 } 11538 11539 /** 11540 * Indicates the selection state of this view. 11541 * 11542 * @return true if the view is selected, false otherwise 11543 */ 11544 @ViewDebug.ExportedProperty 11545 public boolean isSelected() { 11546 return (mPrivateFlags & SELECTED) != 0; 11547 } 11548 11549 /** 11550 * Changes the activated state of this view. A view can be activated or not. 11551 * Note that activation is not the same as selection. Selection is 11552 * a transient property, representing the view (hierarchy) the user is 11553 * currently interacting with. Activation is a longer-term state that the 11554 * user can move views in and out of. For example, in a list view with 11555 * single or multiple selection enabled, the views in the current selection 11556 * set are activated. (Um, yeah, we are deeply sorry about the terminology 11557 * here.) The activated state is propagated down to children of the view it 11558 * is set on. 11559 * 11560 * @param activated true if the view must be activated, false otherwise 11561 */ 11562 public void setActivated(boolean activated) { 11563 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 11564 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 11565 invalidate(true); 11566 refreshDrawableState(); 11567 dispatchSetActivated(activated); 11568 } 11569 } 11570 11571 /** 11572 * Dispatch setActivated to all of this View's children. 11573 * 11574 * @see #setActivated(boolean) 11575 * 11576 * @param activated The new activated state 11577 */ 11578 protected void dispatchSetActivated(boolean activated) { 11579 } 11580 11581 /** 11582 * Indicates the activation state of this view. 11583 * 11584 * @return true if the view is activated, false otherwise 11585 */ 11586 @ViewDebug.ExportedProperty 11587 public boolean isActivated() { 11588 return (mPrivateFlags & ACTIVATED) != 0; 11589 } 11590 11591 /** 11592 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 11593 * observer can be used to get notifications when global events, like 11594 * layout, happen. 11595 * 11596 * The returned ViewTreeObserver observer is not guaranteed to remain 11597 * valid for the lifetime of this View. If the caller of this method keeps 11598 * a long-lived reference to ViewTreeObserver, it should always check for 11599 * the return value of {@link ViewTreeObserver#isAlive()}. 11600 * 11601 * @return The ViewTreeObserver for this view's hierarchy. 11602 */ 11603 public ViewTreeObserver getViewTreeObserver() { 11604 if (mAttachInfo != null) { 11605 return mAttachInfo.mTreeObserver; 11606 } 11607 if (mFloatingTreeObserver == null) { 11608 mFloatingTreeObserver = new ViewTreeObserver(); 11609 } 11610 return mFloatingTreeObserver; 11611 } 11612 11613 /** 11614 * <p>Finds the topmost view in the current view hierarchy.</p> 11615 * 11616 * @return the topmost view containing this view 11617 */ 11618 public View getRootView() { 11619 if (mAttachInfo != null) { 11620 final View v = mAttachInfo.mRootView; 11621 if (v != null) { 11622 return v; 11623 } 11624 } 11625 11626 View parent = this; 11627 11628 while (parent.mParent != null && parent.mParent instanceof View) { 11629 parent = (View) parent.mParent; 11630 } 11631 11632 return parent; 11633 } 11634 11635 /** 11636 * <p>Computes the coordinates of this view on the screen. The argument 11637 * must be an array of two integers. After the method returns, the array 11638 * contains the x and y location in that order.</p> 11639 * 11640 * @param location an array of two integers in which to hold the coordinates 11641 */ 11642 public void getLocationOnScreen(int[] location) { 11643 getLocationInWindow(location); 11644 11645 final AttachInfo info = mAttachInfo; 11646 if (info != null) { 11647 location[0] += info.mWindowLeft; 11648 location[1] += info.mWindowTop; 11649 } 11650 } 11651 11652 /** 11653 * <p>Computes the coordinates of this view in its window. The argument 11654 * must be an array of two integers. After the method returns, the array 11655 * contains the x and y location in that order.</p> 11656 * 11657 * @param location an array of two integers in which to hold the coordinates 11658 */ 11659 public void getLocationInWindow(int[] location) { 11660 if (location == null || location.length < 2) { 11661 throw new IllegalArgumentException("location must be an array of " 11662 + "two integers"); 11663 } 11664 11665 location[0] = mLeft + (int) (mTranslationX + 0.5f); 11666 location[1] = mTop + (int) (mTranslationY + 0.5f); 11667 11668 ViewParent viewParent = mParent; 11669 while (viewParent instanceof View) { 11670 final View view = (View)viewParent; 11671 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 11672 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 11673 viewParent = view.mParent; 11674 } 11675 11676 if (viewParent instanceof ViewRootImpl) { 11677 // *cough* 11678 final ViewRootImpl vr = (ViewRootImpl)viewParent; 11679 location[1] -= vr.mCurScrollY; 11680 } 11681 } 11682 11683 /** 11684 * {@hide} 11685 * @param id the id of the view to be found 11686 * @return the view of the specified id, null if cannot be found 11687 */ 11688 protected View findViewTraversal(int id) { 11689 if (id == mID) { 11690 return this; 11691 } 11692 return null; 11693 } 11694 11695 /** 11696 * {@hide} 11697 * @param tag the tag of the view to be found 11698 * @return the view of specified tag, null if cannot be found 11699 */ 11700 protected View findViewWithTagTraversal(Object tag) { 11701 if (tag != null && tag.equals(mTag)) { 11702 return this; 11703 } 11704 return null; 11705 } 11706 11707 /** 11708 * {@hide} 11709 * @param predicate The predicate to evaluate. 11710 * @return The first view that matches the predicate or null. 11711 */ 11712 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 11713 if (predicate.apply(this)) { 11714 return this; 11715 } 11716 return null; 11717 } 11718 11719 /** 11720 * Look for a child view with the given id. If this view has the given 11721 * id, return this view. 11722 * 11723 * @param id The id to search for. 11724 * @return The view that has the given id in the hierarchy or null 11725 */ 11726 public final View findViewById(int id) { 11727 if (id < 0) { 11728 return null; 11729 } 11730 return findViewTraversal(id); 11731 } 11732 11733 /** 11734 * Look for a child view with the given tag. If this view has the given 11735 * tag, return this view. 11736 * 11737 * @param tag The tag to search for, using "tag.equals(getTag())". 11738 * @return The View that has the given tag in the hierarchy or null 11739 */ 11740 public final View findViewWithTag(Object tag) { 11741 if (tag == null) { 11742 return null; 11743 } 11744 return findViewWithTagTraversal(tag); 11745 } 11746 11747 /** 11748 * {@hide} 11749 * Look for a child view that matches the specified predicate. 11750 * If this view matches the predicate, return this view. 11751 * 11752 * @param predicate The predicate to evaluate. 11753 * @return The first view that matches the predicate or null. 11754 */ 11755 public final View findViewByPredicate(Predicate<View> predicate) { 11756 return findViewByPredicateTraversal(predicate); 11757 } 11758 11759 /** 11760 * Sets the identifier for this view. The identifier does not have to be 11761 * unique in this view's hierarchy. The identifier should be a positive 11762 * number. 11763 * 11764 * @see #NO_ID 11765 * @see #getId() 11766 * @see #findViewById(int) 11767 * 11768 * @param id a number used to identify the view 11769 * 11770 * @attr ref android.R.styleable#View_id 11771 */ 11772 public void setId(int id) { 11773 mID = id; 11774 } 11775 11776 /** 11777 * {@hide} 11778 * 11779 * @param isRoot true if the view belongs to the root namespace, false 11780 * otherwise 11781 */ 11782 public void setIsRootNamespace(boolean isRoot) { 11783 if (isRoot) { 11784 mPrivateFlags |= IS_ROOT_NAMESPACE; 11785 } else { 11786 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 11787 } 11788 } 11789 11790 /** 11791 * {@hide} 11792 * 11793 * @return true if the view belongs to the root namespace, false otherwise 11794 */ 11795 public boolean isRootNamespace() { 11796 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 11797 } 11798 11799 /** 11800 * Returns this view's identifier. 11801 * 11802 * @return a positive integer used to identify the view or {@link #NO_ID} 11803 * if the view has no ID 11804 * 11805 * @see #setId(int) 11806 * @see #findViewById(int) 11807 * @attr ref android.R.styleable#View_id 11808 */ 11809 @ViewDebug.CapturedViewProperty 11810 public int getId() { 11811 return mID; 11812 } 11813 11814 /** 11815 * Returns this view's tag. 11816 * 11817 * @return the Object stored in this view as a tag 11818 * 11819 * @see #setTag(Object) 11820 * @see #getTag(int) 11821 */ 11822 @ViewDebug.ExportedProperty 11823 public Object getTag() { 11824 return mTag; 11825 } 11826 11827 /** 11828 * Sets the tag associated with this view. A tag can be used to mark 11829 * a view in its hierarchy and does not have to be unique within the 11830 * hierarchy. Tags can also be used to store data within a view without 11831 * resorting to another data structure. 11832 * 11833 * @param tag an Object to tag the view with 11834 * 11835 * @see #getTag() 11836 * @see #setTag(int, Object) 11837 */ 11838 public void setTag(final Object tag) { 11839 mTag = tag; 11840 } 11841 11842 /** 11843 * Returns the tag associated with this view and the specified key. 11844 * 11845 * @param key The key identifying the tag 11846 * 11847 * @return the Object stored in this view as a tag 11848 * 11849 * @see #setTag(int, Object) 11850 * @see #getTag() 11851 */ 11852 public Object getTag(int key) { 11853 SparseArray<Object> tags = null; 11854 synchronized (sTagsLock) { 11855 if (sTags != null) { 11856 tags = sTags.get(this); 11857 } 11858 } 11859 11860 if (tags != null) return tags.get(key); 11861 return null; 11862 } 11863 11864 /** 11865 * Sets a tag associated with this view and a key. A tag can be used 11866 * to mark a view in its hierarchy and does not have to be unique within 11867 * the hierarchy. Tags can also be used to store data within a view 11868 * without resorting to another data structure. 11869 * 11870 * The specified key should be an id declared in the resources of the 11871 * application to ensure it is unique (see the <a 11872 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 11873 * Keys identified as belonging to 11874 * the Android framework or not associated with any package will cause 11875 * an {@link IllegalArgumentException} to be thrown. 11876 * 11877 * @param key The key identifying the tag 11878 * @param tag An Object to tag the view with 11879 * 11880 * @throws IllegalArgumentException If they specified key is not valid 11881 * 11882 * @see #setTag(Object) 11883 * @see #getTag(int) 11884 */ 11885 public void setTag(int key, final Object tag) { 11886 // If the package id is 0x00 or 0x01, it's either an undefined package 11887 // or a framework id 11888 if ((key >>> 24) < 2) { 11889 throw new IllegalArgumentException("The key must be an application-specific " 11890 + "resource id."); 11891 } 11892 11893 setTagInternal(this, key, tag); 11894 } 11895 11896 /** 11897 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 11898 * framework id. 11899 * 11900 * @hide 11901 */ 11902 public void setTagInternal(int key, Object tag) { 11903 if ((key >>> 24) != 0x1) { 11904 throw new IllegalArgumentException("The key must be a framework-specific " 11905 + "resource id."); 11906 } 11907 11908 setTagInternal(this, key, tag); 11909 } 11910 11911 private static void setTagInternal(View view, int key, Object tag) { 11912 SparseArray<Object> tags = null; 11913 synchronized (sTagsLock) { 11914 if (sTags == null) { 11915 sTags = new WeakHashMap<View, SparseArray<Object>>(); 11916 } else { 11917 tags = sTags.get(view); 11918 } 11919 } 11920 11921 if (tags == null) { 11922 tags = new SparseArray<Object>(2); 11923 synchronized (sTagsLock) { 11924 sTags.put(view, tags); 11925 } 11926 } 11927 11928 tags.put(key, tag); 11929 } 11930 11931 /** 11932 * @param consistency The type of consistency. See ViewDebug for more information. 11933 * 11934 * @hide 11935 */ 11936 protected boolean dispatchConsistencyCheck(int consistency) { 11937 return onConsistencyCheck(consistency); 11938 } 11939 11940 /** 11941 * Method that subclasses should implement to check their consistency. The type of 11942 * consistency check is indicated by the bit field passed as a parameter. 11943 * 11944 * @param consistency The type of consistency. See ViewDebug for more information. 11945 * 11946 * @throws IllegalStateException if the view is in an inconsistent state. 11947 * 11948 * @hide 11949 */ 11950 protected boolean onConsistencyCheck(int consistency) { 11951 boolean result = true; 11952 11953 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 11954 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 11955 11956 if (checkLayout) { 11957 if (getParent() == null) { 11958 result = false; 11959 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 11960 "View " + this + " does not have a parent."); 11961 } 11962 11963 if (mAttachInfo == null) { 11964 result = false; 11965 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 11966 "View " + this + " is not attached to a window."); 11967 } 11968 } 11969 11970 if (checkDrawing) { 11971 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 11972 // from their draw() method 11973 11974 if ((mPrivateFlags & DRAWN) != DRAWN && 11975 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 11976 result = false; 11977 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 11978 "View " + this + " was invalidated but its drawing cache is valid."); 11979 } 11980 } 11981 11982 return result; 11983 } 11984 11985 /** 11986 * Prints information about this view in the log output, with the tag 11987 * {@link #VIEW_LOG_TAG}. 11988 * 11989 * @hide 11990 */ 11991 public void debug() { 11992 debug(0); 11993 } 11994 11995 /** 11996 * Prints information about this view in the log output, with the tag 11997 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 11998 * indentation defined by the <code>depth</code>. 11999 * 12000 * @param depth the indentation level 12001 * 12002 * @hide 12003 */ 12004 protected void debug(int depth) { 12005 String output = debugIndent(depth - 1); 12006 12007 output += "+ " + this; 12008 int id = getId(); 12009 if (id != -1) { 12010 output += " (id=" + id + ")"; 12011 } 12012 Object tag = getTag(); 12013 if (tag != null) { 12014 output += " (tag=" + tag + ")"; 12015 } 12016 Log.d(VIEW_LOG_TAG, output); 12017 12018 if ((mPrivateFlags & FOCUSED) != 0) { 12019 output = debugIndent(depth) + " FOCUSED"; 12020 Log.d(VIEW_LOG_TAG, output); 12021 } 12022 12023 output = debugIndent(depth); 12024 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 12025 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 12026 + "} "; 12027 Log.d(VIEW_LOG_TAG, output); 12028 12029 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 12030 || mPaddingBottom != 0) { 12031 output = debugIndent(depth); 12032 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 12033 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 12034 Log.d(VIEW_LOG_TAG, output); 12035 } 12036 12037 output = debugIndent(depth); 12038 output += "mMeasureWidth=" + mMeasuredWidth + 12039 " mMeasureHeight=" + mMeasuredHeight; 12040 Log.d(VIEW_LOG_TAG, output); 12041 12042 output = debugIndent(depth); 12043 if (mLayoutParams == null) { 12044 output += "BAD! no layout params"; 12045 } else { 12046 output = mLayoutParams.debug(output); 12047 } 12048 Log.d(VIEW_LOG_TAG, output); 12049 12050 output = debugIndent(depth); 12051 output += "flags={"; 12052 output += View.printFlags(mViewFlags); 12053 output += "}"; 12054 Log.d(VIEW_LOG_TAG, output); 12055 12056 output = debugIndent(depth); 12057 output += "privateFlags={"; 12058 output += View.printPrivateFlags(mPrivateFlags); 12059 output += "}"; 12060 Log.d(VIEW_LOG_TAG, output); 12061 } 12062 12063 /** 12064 * Creates an string of whitespaces used for indentation. 12065 * 12066 * @param depth the indentation level 12067 * @return a String containing (depth * 2 + 3) * 2 white spaces 12068 * 12069 * @hide 12070 */ 12071 protected static String debugIndent(int depth) { 12072 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 12073 for (int i = 0; i < (depth * 2) + 3; i++) { 12074 spaces.append(' ').append(' '); 12075 } 12076 return spaces.toString(); 12077 } 12078 12079 /** 12080 * <p>Return the offset of the widget's text baseline from the widget's top 12081 * boundary. If this widget does not support baseline alignment, this 12082 * method returns -1. </p> 12083 * 12084 * @return the offset of the baseline within the widget's bounds or -1 12085 * if baseline alignment is not supported 12086 */ 12087 @ViewDebug.ExportedProperty(category = "layout") 12088 public int getBaseline() { 12089 return -1; 12090 } 12091 12092 /** 12093 * Call this when something has changed which has invalidated the 12094 * layout of this view. This will schedule a layout pass of the view 12095 * tree. 12096 */ 12097 public void requestLayout() { 12098 if (ViewDebug.TRACE_HIERARCHY) { 12099 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 12100 } 12101 12102 mPrivateFlags |= FORCE_LAYOUT; 12103 mPrivateFlags |= INVALIDATED; 12104 12105 if (mParent != null) { 12106 if (mLayoutParams != null) { 12107 mLayoutParams.resolveWithDirection(getResolvedLayoutDirection()); 12108 } 12109 if (!mParent.isLayoutRequested()) { 12110 mParent.requestLayout(); 12111 } 12112 } 12113 } 12114 12115 /** 12116 * Forces this view to be laid out during the next layout pass. 12117 * This method does not call requestLayout() or forceLayout() 12118 * on the parent. 12119 */ 12120 public void forceLayout() { 12121 mPrivateFlags |= FORCE_LAYOUT; 12122 mPrivateFlags |= INVALIDATED; 12123 } 12124 12125 /** 12126 * <p> 12127 * This is called to find out how big a view should be. The parent 12128 * supplies constraint information in the width and height parameters. 12129 * </p> 12130 * 12131 * <p> 12132 * The actual mesurement work of a view is performed in 12133 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 12134 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 12135 * </p> 12136 * 12137 * 12138 * @param widthMeasureSpec Horizontal space requirements as imposed by the 12139 * parent 12140 * @param heightMeasureSpec Vertical space requirements as imposed by the 12141 * parent 12142 * 12143 * @see #onMeasure(int, int) 12144 */ 12145 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 12146 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 12147 widthMeasureSpec != mOldWidthMeasureSpec || 12148 heightMeasureSpec != mOldHeightMeasureSpec) { 12149 12150 // first clears the measured dimension flag 12151 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 12152 12153 if (ViewDebug.TRACE_HIERARCHY) { 12154 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 12155 } 12156 12157 // measure ourselves, this should set the measured dimension flag back 12158 onMeasure(widthMeasureSpec, heightMeasureSpec); 12159 12160 // flag not set, setMeasuredDimension() was not invoked, we raise 12161 // an exception to warn the developer 12162 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 12163 throw new IllegalStateException("onMeasure() did not set the" 12164 + " measured dimension by calling" 12165 + " setMeasuredDimension()"); 12166 } 12167 12168 mPrivateFlags |= LAYOUT_REQUIRED; 12169 } 12170 12171 mOldWidthMeasureSpec = widthMeasureSpec; 12172 mOldHeightMeasureSpec = heightMeasureSpec; 12173 } 12174 12175 /** 12176 * <p> 12177 * Measure the view and its content to determine the measured width and the 12178 * measured height. This method is invoked by {@link #measure(int, int)} and 12179 * should be overriden by subclasses to provide accurate and efficient 12180 * measurement of their contents. 12181 * </p> 12182 * 12183 * <p> 12184 * <strong>CONTRACT:</strong> When overriding this method, you 12185 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 12186 * measured width and height of this view. Failure to do so will trigger an 12187 * <code>IllegalStateException</code>, thrown by 12188 * {@link #measure(int, int)}. Calling the superclass' 12189 * {@link #onMeasure(int, int)} is a valid use. 12190 * </p> 12191 * 12192 * <p> 12193 * The base class implementation of measure defaults to the background size, 12194 * unless a larger size is allowed by the MeasureSpec. Subclasses should 12195 * override {@link #onMeasure(int, int)} to provide better measurements of 12196 * their content. 12197 * </p> 12198 * 12199 * <p> 12200 * If this method is overridden, it is the subclass's responsibility to make 12201 * sure the measured height and width are at least the view's minimum height 12202 * and width ({@link #getSuggestedMinimumHeight()} and 12203 * {@link #getSuggestedMinimumWidth()}). 12204 * </p> 12205 * 12206 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 12207 * The requirements are encoded with 12208 * {@link android.view.View.MeasureSpec}. 12209 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 12210 * The requirements are encoded with 12211 * {@link android.view.View.MeasureSpec}. 12212 * 12213 * @see #getMeasuredWidth() 12214 * @see #getMeasuredHeight() 12215 * @see #setMeasuredDimension(int, int) 12216 * @see #getSuggestedMinimumHeight() 12217 * @see #getSuggestedMinimumWidth() 12218 * @see android.view.View.MeasureSpec#getMode(int) 12219 * @see android.view.View.MeasureSpec#getSize(int) 12220 */ 12221 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 12222 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 12223 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 12224 } 12225 12226 /** 12227 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 12228 * measured width and measured height. Failing to do so will trigger an 12229 * exception at measurement time.</p> 12230 * 12231 * @param measuredWidth The measured width of this view. May be a complex 12232 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12233 * {@link #MEASURED_STATE_TOO_SMALL}. 12234 * @param measuredHeight The measured height of this view. May be a complex 12235 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12236 * {@link #MEASURED_STATE_TOO_SMALL}. 12237 */ 12238 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 12239 mMeasuredWidth = measuredWidth; 12240 mMeasuredHeight = measuredHeight; 12241 12242 mPrivateFlags |= MEASURED_DIMENSION_SET; 12243 } 12244 12245 /** 12246 * Merge two states as returned by {@link #getMeasuredState()}. 12247 * @param curState The current state as returned from a view or the result 12248 * of combining multiple views. 12249 * @param newState The new view state to combine. 12250 * @return Returns a new integer reflecting the combination of the two 12251 * states. 12252 */ 12253 public static int combineMeasuredStates(int curState, int newState) { 12254 return curState | newState; 12255 } 12256 12257 /** 12258 * Version of {@link #resolveSizeAndState(int, int, int)} 12259 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 12260 */ 12261 public static int resolveSize(int size, int measureSpec) { 12262 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 12263 } 12264 12265 /** 12266 * Utility to reconcile a desired size and state, with constraints imposed 12267 * by a MeasureSpec. Will take the desired size, unless a different size 12268 * is imposed by the constraints. The returned value is a compound integer, 12269 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 12270 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 12271 * size is smaller than the size the view wants to be. 12272 * 12273 * @param size How big the view wants to be 12274 * @param measureSpec Constraints imposed by the parent 12275 * @return Size information bit mask as defined by 12276 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 12277 */ 12278 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 12279 int result = size; 12280 int specMode = MeasureSpec.getMode(measureSpec); 12281 int specSize = MeasureSpec.getSize(measureSpec); 12282 switch (specMode) { 12283 case MeasureSpec.UNSPECIFIED: 12284 result = size; 12285 break; 12286 case MeasureSpec.AT_MOST: 12287 if (specSize < size) { 12288 result = specSize | MEASURED_STATE_TOO_SMALL; 12289 } else { 12290 result = size; 12291 } 12292 break; 12293 case MeasureSpec.EXACTLY: 12294 result = specSize; 12295 break; 12296 } 12297 return result | (childMeasuredState&MEASURED_STATE_MASK); 12298 } 12299 12300 /** 12301 * Utility to return a default size. Uses the supplied size if the 12302 * MeasureSpec imposed no constraints. Will get larger if allowed 12303 * by the MeasureSpec. 12304 * 12305 * @param size Default size for this view 12306 * @param measureSpec Constraints imposed by the parent 12307 * @return The size this view should be. 12308 */ 12309 public static int getDefaultSize(int size, int measureSpec) { 12310 int result = size; 12311 int specMode = MeasureSpec.getMode(measureSpec); 12312 int specSize = MeasureSpec.getSize(measureSpec); 12313 12314 switch (specMode) { 12315 case MeasureSpec.UNSPECIFIED: 12316 result = size; 12317 break; 12318 case MeasureSpec.AT_MOST: 12319 case MeasureSpec.EXACTLY: 12320 result = specSize; 12321 break; 12322 } 12323 return result; 12324 } 12325 12326 /** 12327 * Returns the suggested minimum height that the view should use. This 12328 * returns the maximum of the view's minimum height 12329 * and the background's minimum height 12330 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 12331 * <p> 12332 * When being used in {@link #onMeasure(int, int)}, the caller should still 12333 * ensure the returned height is within the requirements of the parent. 12334 * 12335 * @return The suggested minimum height of the view. 12336 */ 12337 protected int getSuggestedMinimumHeight() { 12338 int suggestedMinHeight = mMinHeight; 12339 12340 if (mBGDrawable != null) { 12341 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 12342 if (suggestedMinHeight < bgMinHeight) { 12343 suggestedMinHeight = bgMinHeight; 12344 } 12345 } 12346 12347 return suggestedMinHeight; 12348 } 12349 12350 /** 12351 * Returns the suggested minimum width that the view should use. This 12352 * returns the maximum of the view's minimum width) 12353 * and the background's minimum width 12354 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 12355 * <p> 12356 * When being used in {@link #onMeasure(int, int)}, the caller should still 12357 * ensure the returned width is within the requirements of the parent. 12358 * 12359 * @return The suggested minimum width of the view. 12360 */ 12361 protected int getSuggestedMinimumWidth() { 12362 int suggestedMinWidth = mMinWidth; 12363 12364 if (mBGDrawable != null) { 12365 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 12366 if (suggestedMinWidth < bgMinWidth) { 12367 suggestedMinWidth = bgMinWidth; 12368 } 12369 } 12370 12371 return suggestedMinWidth; 12372 } 12373 12374 /** 12375 * Sets the minimum height of the view. It is not guaranteed the view will 12376 * be able to achieve this minimum height (for example, if its parent layout 12377 * constrains it with less available height). 12378 * 12379 * @param minHeight The minimum height the view will try to be. 12380 */ 12381 public void setMinimumHeight(int minHeight) { 12382 mMinHeight = minHeight; 12383 } 12384 12385 /** 12386 * Sets the minimum width of the view. It is not guaranteed the view will 12387 * be able to achieve this minimum width (for example, if its parent layout 12388 * constrains it with less available width). 12389 * 12390 * @param minWidth The minimum width the view will try to be. 12391 */ 12392 public void setMinimumWidth(int minWidth) { 12393 mMinWidth = minWidth; 12394 } 12395 12396 /** 12397 * Get the animation currently associated with this view. 12398 * 12399 * @return The animation that is currently playing or 12400 * scheduled to play for this view. 12401 */ 12402 public Animation getAnimation() { 12403 return mCurrentAnimation; 12404 } 12405 12406 /** 12407 * Start the specified animation now. 12408 * 12409 * @param animation the animation to start now 12410 */ 12411 public void startAnimation(Animation animation) { 12412 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 12413 setAnimation(animation); 12414 invalidateParentCaches(); 12415 invalidate(true); 12416 } 12417 12418 /** 12419 * Cancels any animations for this view. 12420 */ 12421 public void clearAnimation() { 12422 if (mCurrentAnimation != null) { 12423 mCurrentAnimation.detach(); 12424 } 12425 mCurrentAnimation = null; 12426 invalidateParentIfNeeded(); 12427 } 12428 12429 /** 12430 * Sets the next animation to play for this view. 12431 * If you want the animation to play immediately, use 12432 * startAnimation. This method provides allows fine-grained 12433 * control over the start time and invalidation, but you 12434 * must make sure that 1) the animation has a start time set, and 12435 * 2) the view will be invalidated when the animation is supposed to 12436 * start. 12437 * 12438 * @param animation The next animation, or null. 12439 */ 12440 public void setAnimation(Animation animation) { 12441 mCurrentAnimation = animation; 12442 if (animation != null) { 12443 animation.reset(); 12444 } 12445 } 12446 12447 /** 12448 * Invoked by a parent ViewGroup to notify the start of the animation 12449 * currently associated with this view. If you override this method, 12450 * always call super.onAnimationStart(); 12451 * 12452 * @see #setAnimation(android.view.animation.Animation) 12453 * @see #getAnimation() 12454 */ 12455 protected void onAnimationStart() { 12456 mPrivateFlags |= ANIMATION_STARTED; 12457 } 12458 12459 /** 12460 * Invoked by a parent ViewGroup to notify the end of the animation 12461 * currently associated with this view. If you override this method, 12462 * always call super.onAnimationEnd(); 12463 * 12464 * @see #setAnimation(android.view.animation.Animation) 12465 * @see #getAnimation() 12466 */ 12467 protected void onAnimationEnd() { 12468 mPrivateFlags &= ~ANIMATION_STARTED; 12469 } 12470 12471 /** 12472 * Invoked if there is a Transform that involves alpha. Subclass that can 12473 * draw themselves with the specified alpha should return true, and then 12474 * respect that alpha when their onDraw() is called. If this returns false 12475 * then the view may be redirected to draw into an offscreen buffer to 12476 * fulfill the request, which will look fine, but may be slower than if the 12477 * subclass handles it internally. The default implementation returns false. 12478 * 12479 * @param alpha The alpha (0..255) to apply to the view's drawing 12480 * @return true if the view can draw with the specified alpha. 12481 */ 12482 protected boolean onSetAlpha(int alpha) { 12483 return false; 12484 } 12485 12486 /** 12487 * This is used by the RootView to perform an optimization when 12488 * the view hierarchy contains one or several SurfaceView. 12489 * SurfaceView is always considered transparent, but its children are not, 12490 * therefore all View objects remove themselves from the global transparent 12491 * region (passed as a parameter to this function). 12492 * 12493 * @param region The transparent region for this ViewAncestor (window). 12494 * 12495 * @return Returns true if the effective visibility of the view at this 12496 * point is opaque, regardless of the transparent region; returns false 12497 * if it is possible for underlying windows to be seen behind the view. 12498 * 12499 * {@hide} 12500 */ 12501 public boolean gatherTransparentRegion(Region region) { 12502 final AttachInfo attachInfo = mAttachInfo; 12503 if (region != null && attachInfo != null) { 12504 final int pflags = mPrivateFlags; 12505 if ((pflags & SKIP_DRAW) == 0) { 12506 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 12507 // remove it from the transparent region. 12508 final int[] location = attachInfo.mTransparentLocation; 12509 getLocationInWindow(location); 12510 region.op(location[0], location[1], location[0] + mRight - mLeft, 12511 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 12512 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 12513 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 12514 // exists, so we remove the background drawable's non-transparent 12515 // parts from this transparent region. 12516 applyDrawableToTransparentRegion(mBGDrawable, region); 12517 } 12518 } 12519 return true; 12520 } 12521 12522 /** 12523 * Play a sound effect for this view. 12524 * 12525 * <p>The framework will play sound effects for some built in actions, such as 12526 * clicking, but you may wish to play these effects in your widget, 12527 * for instance, for internal navigation. 12528 * 12529 * <p>The sound effect will only be played if sound effects are enabled by the user, and 12530 * {@link #isSoundEffectsEnabled()} is true. 12531 * 12532 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 12533 */ 12534 public void playSoundEffect(int soundConstant) { 12535 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 12536 return; 12537 } 12538 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 12539 } 12540 12541 /** 12542 * BZZZTT!!1! 12543 * 12544 * <p>Provide haptic feedback to the user for this view. 12545 * 12546 * <p>The framework will provide haptic feedback for some built in actions, 12547 * such as long presses, but you may wish to provide feedback for your 12548 * own widget. 12549 * 12550 * <p>The feedback will only be performed if 12551 * {@link #isHapticFeedbackEnabled()} is true. 12552 * 12553 * @param feedbackConstant One of the constants defined in 12554 * {@link HapticFeedbackConstants} 12555 */ 12556 public boolean performHapticFeedback(int feedbackConstant) { 12557 return performHapticFeedback(feedbackConstant, 0); 12558 } 12559 12560 /** 12561 * BZZZTT!!1! 12562 * 12563 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 12564 * 12565 * @param feedbackConstant One of the constants defined in 12566 * {@link HapticFeedbackConstants} 12567 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 12568 */ 12569 public boolean performHapticFeedback(int feedbackConstant, int flags) { 12570 if (mAttachInfo == null) { 12571 return false; 12572 } 12573 //noinspection SimplifiableIfStatement 12574 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 12575 && !isHapticFeedbackEnabled()) { 12576 return false; 12577 } 12578 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 12579 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 12580 } 12581 12582 /** 12583 * Request that the visibility of the status bar be changed. 12584 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 12585 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 12586 */ 12587 public void setSystemUiVisibility(int visibility) { 12588 if (visibility != mSystemUiVisibility) { 12589 mSystemUiVisibility = visibility; 12590 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12591 mParent.recomputeViewAttributes(this); 12592 } 12593 } 12594 } 12595 12596 /** 12597 * Returns the status bar visibility that this view has requested. 12598 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 12599 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 12600 */ 12601 public int getSystemUiVisibility() { 12602 return mSystemUiVisibility; 12603 } 12604 12605 /** 12606 * Set a listener to receive callbacks when the visibility of the system bar changes. 12607 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 12608 */ 12609 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 12610 mOnSystemUiVisibilityChangeListener = l; 12611 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12612 mParent.recomputeViewAttributes(this); 12613 } 12614 } 12615 12616 /** 12617 */ 12618 public void dispatchSystemUiVisibilityChanged(int visibility) { 12619 if (mOnSystemUiVisibilityChangeListener != null) { 12620 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 12621 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 12622 } 12623 } 12624 12625 /** 12626 * Creates an image that the system displays during the drag and drop 12627 * operation. This is called a "drag shadow". The default implementation 12628 * for a DragShadowBuilder based on a View returns an image that has exactly the same 12629 * appearance as the given View. The default also positions the center of the drag shadow 12630 * directly under the touch point. If no View is provided (the constructor with no parameters 12631 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 12632 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 12633 * default is an invisible drag shadow. 12634 * <p> 12635 * You are not required to use the View you provide to the constructor as the basis of the 12636 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 12637 * anything you want as the drag shadow. 12638 * </p> 12639 * <p> 12640 * You pass a DragShadowBuilder object to the system when you start the drag. The system 12641 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 12642 * size and position of the drag shadow. It uses this data to construct a 12643 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 12644 * so that your application can draw the shadow image in the Canvas. 12645 * </p> 12646 */ 12647 public static class DragShadowBuilder { 12648 private final WeakReference<View> mView; 12649 12650 /** 12651 * Constructs a shadow image builder based on a View. By default, the resulting drag 12652 * shadow will have the same appearance and dimensions as the View, with the touch point 12653 * over the center of the View. 12654 * @param view A View. Any View in scope can be used. 12655 */ 12656 public DragShadowBuilder(View view) { 12657 mView = new WeakReference<View>(view); 12658 } 12659 12660 /** 12661 * Construct a shadow builder object with no associated View. This 12662 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 12663 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 12664 * to supply the drag shadow's dimensions and appearance without 12665 * reference to any View object. If they are not overridden, then the result is an 12666 * invisible drag shadow. 12667 */ 12668 public DragShadowBuilder() { 12669 mView = new WeakReference<View>(null); 12670 } 12671 12672 /** 12673 * Returns the View object that had been passed to the 12674 * {@link #View.DragShadowBuilder(View)} 12675 * constructor. If that View parameter was {@code null} or if the 12676 * {@link #View.DragShadowBuilder()} 12677 * constructor was used to instantiate the builder object, this method will return 12678 * null. 12679 * 12680 * @return The View object associate with this builder object. 12681 */ 12682 @SuppressWarnings({"JavadocReference"}) 12683 final public View getView() { 12684 return mView.get(); 12685 } 12686 12687 /** 12688 * Provides the metrics for the shadow image. These include the dimensions of 12689 * the shadow image, and the point within that shadow that should 12690 * be centered under the touch location while dragging. 12691 * <p> 12692 * The default implementation sets the dimensions of the shadow to be the 12693 * same as the dimensions of the View itself and centers the shadow under 12694 * the touch point. 12695 * </p> 12696 * 12697 * @param shadowSize A {@link android.graphics.Point} containing the width and height 12698 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 12699 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 12700 * image. 12701 * 12702 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 12703 * shadow image that should be underneath the touch point during the drag and drop 12704 * operation. Your application must set {@link android.graphics.Point#x} to the 12705 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 12706 */ 12707 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 12708 final View view = mView.get(); 12709 if (view != null) { 12710 shadowSize.set(view.getWidth(), view.getHeight()); 12711 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 12712 } else { 12713 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 12714 } 12715 } 12716 12717 /** 12718 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 12719 * based on the dimensions it received from the 12720 * {@link #onProvideShadowMetrics(Point, Point)} callback. 12721 * 12722 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 12723 */ 12724 public void onDrawShadow(Canvas canvas) { 12725 final View view = mView.get(); 12726 if (view != null) { 12727 view.draw(canvas); 12728 } else { 12729 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 12730 } 12731 } 12732 } 12733 12734 /** 12735 * Starts a drag and drop operation. When your application calls this method, it passes a 12736 * {@link android.view.View.DragShadowBuilder} object to the system. The 12737 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 12738 * to get metrics for the drag shadow, and then calls the object's 12739 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 12740 * <p> 12741 * Once the system has the drag shadow, it begins the drag and drop operation by sending 12742 * drag events to all the View objects in your application that are currently visible. It does 12743 * this either by calling the View object's drag listener (an implementation of 12744 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 12745 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 12746 * Both are passed a {@link android.view.DragEvent} object that has a 12747 * {@link android.view.DragEvent#getAction()} value of 12748 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 12749 * </p> 12750 * <p> 12751 * Your application can invoke startDrag() on any attached View object. The View object does not 12752 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 12753 * be related to the View the user selected for dragging. 12754 * </p> 12755 * @param data A {@link android.content.ClipData} object pointing to the data to be 12756 * transferred by the drag and drop operation. 12757 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 12758 * drag shadow. 12759 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 12760 * drop operation. This Object is put into every DragEvent object sent by the system during the 12761 * current drag. 12762 * <p> 12763 * myLocalState is a lightweight mechanism for the sending information from the dragged View 12764 * to the target Views. For example, it can contain flags that differentiate between a 12765 * a copy operation and a move operation. 12766 * </p> 12767 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 12768 * so the parameter should be set to 0. 12769 * @return {@code true} if the method completes successfully, or 12770 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 12771 * do a drag, and so no drag operation is in progress. 12772 */ 12773 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 12774 Object myLocalState, int flags) { 12775 if (ViewDebug.DEBUG_DRAG) { 12776 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 12777 } 12778 boolean okay = false; 12779 12780 Point shadowSize = new Point(); 12781 Point shadowTouchPoint = new Point(); 12782 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 12783 12784 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 12785 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 12786 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 12787 } 12788 12789 if (ViewDebug.DEBUG_DRAG) { 12790 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 12791 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 12792 } 12793 Surface surface = new Surface(); 12794 try { 12795 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 12796 flags, shadowSize.x, shadowSize.y, surface); 12797 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 12798 + " surface=" + surface); 12799 if (token != null) { 12800 Canvas canvas = surface.lockCanvas(null); 12801 try { 12802 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 12803 shadowBuilder.onDrawShadow(canvas); 12804 } finally { 12805 surface.unlockCanvasAndPost(canvas); 12806 } 12807 12808 final ViewRootImpl root = getViewRootImpl(); 12809 12810 // Cache the local state object for delivery with DragEvents 12811 root.setLocalDragState(myLocalState); 12812 12813 // repurpose 'shadowSize' for the last touch point 12814 root.getLastTouchPoint(shadowSize); 12815 12816 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 12817 shadowSize.x, shadowSize.y, 12818 shadowTouchPoint.x, shadowTouchPoint.y, data); 12819 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 12820 } 12821 } catch (Exception e) { 12822 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 12823 surface.destroy(); 12824 } 12825 12826 return okay; 12827 } 12828 12829 /** 12830 * Handles drag events sent by the system following a call to 12831 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 12832 *<p> 12833 * When the system calls this method, it passes a 12834 * {@link android.view.DragEvent} object. A call to 12835 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 12836 * in DragEvent. The method uses these to determine what is happening in the drag and drop 12837 * operation. 12838 * @param event The {@link android.view.DragEvent} sent by the system. 12839 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 12840 * in DragEvent, indicating the type of drag event represented by this object. 12841 * @return {@code true} if the method was successful, otherwise {@code false}. 12842 * <p> 12843 * The method should return {@code true} in response to an action type of 12844 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 12845 * operation. 12846 * </p> 12847 * <p> 12848 * The method should also return {@code true} in response to an action type of 12849 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 12850 * {@code false} if it didn't. 12851 * </p> 12852 */ 12853 public boolean onDragEvent(DragEvent event) { 12854 return false; 12855 } 12856 12857 /** 12858 * Detects if this View is enabled and has a drag event listener. 12859 * If both are true, then it calls the drag event listener with the 12860 * {@link android.view.DragEvent} it received. If the drag event listener returns 12861 * {@code true}, then dispatchDragEvent() returns {@code true}. 12862 * <p> 12863 * For all other cases, the method calls the 12864 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 12865 * method and returns its result. 12866 * </p> 12867 * <p> 12868 * This ensures that a drag event is always consumed, even if the View does not have a drag 12869 * event listener. However, if the View has a listener and the listener returns true, then 12870 * onDragEvent() is not called. 12871 * </p> 12872 */ 12873 public boolean dispatchDragEvent(DragEvent event) { 12874 //noinspection SimplifiableIfStatement 12875 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 12876 && mOnDragListener.onDrag(this, event)) { 12877 return true; 12878 } 12879 return onDragEvent(event); 12880 } 12881 12882 boolean canAcceptDrag() { 12883 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 12884 } 12885 12886 /** 12887 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 12888 * it is ever exposed at all. 12889 * @hide 12890 */ 12891 public void onCloseSystemDialogs(String reason) { 12892 } 12893 12894 /** 12895 * Given a Drawable whose bounds have been set to draw into this view, 12896 * update a Region being computed for 12897 * {@link #gatherTransparentRegion(android.graphics.Region)} so 12898 * that any non-transparent parts of the Drawable are removed from the 12899 * given transparent region. 12900 * 12901 * @param dr The Drawable whose transparency is to be applied to the region. 12902 * @param region A Region holding the current transparency information, 12903 * where any parts of the region that are set are considered to be 12904 * transparent. On return, this region will be modified to have the 12905 * transparency information reduced by the corresponding parts of the 12906 * Drawable that are not transparent. 12907 * {@hide} 12908 */ 12909 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 12910 if (DBG) { 12911 Log.i("View", "Getting transparent region for: " + this); 12912 } 12913 final Region r = dr.getTransparentRegion(); 12914 final Rect db = dr.getBounds(); 12915 final AttachInfo attachInfo = mAttachInfo; 12916 if (r != null && attachInfo != null) { 12917 final int w = getRight()-getLeft(); 12918 final int h = getBottom()-getTop(); 12919 if (db.left > 0) { 12920 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 12921 r.op(0, 0, db.left, h, Region.Op.UNION); 12922 } 12923 if (db.right < w) { 12924 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 12925 r.op(db.right, 0, w, h, Region.Op.UNION); 12926 } 12927 if (db.top > 0) { 12928 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 12929 r.op(0, 0, w, db.top, Region.Op.UNION); 12930 } 12931 if (db.bottom < h) { 12932 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 12933 r.op(0, db.bottom, w, h, Region.Op.UNION); 12934 } 12935 final int[] location = attachInfo.mTransparentLocation; 12936 getLocationInWindow(location); 12937 r.translate(location[0], location[1]); 12938 region.op(r, Region.Op.INTERSECT); 12939 } else { 12940 region.op(db, Region.Op.DIFFERENCE); 12941 } 12942 } 12943 12944 private void checkForLongClick(int delayOffset) { 12945 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 12946 mHasPerformedLongPress = false; 12947 12948 if (mPendingCheckForLongPress == null) { 12949 mPendingCheckForLongPress = new CheckForLongPress(); 12950 } 12951 mPendingCheckForLongPress.rememberWindowAttachCount(); 12952 postDelayed(mPendingCheckForLongPress, 12953 ViewConfiguration.getLongPressTimeout() - delayOffset); 12954 } 12955 } 12956 12957 /** 12958 * Inflate a view from an XML resource. This convenience method wraps the {@link 12959 * LayoutInflater} class, which provides a full range of options for view inflation. 12960 * 12961 * @param context The Context object for your activity or application. 12962 * @param resource The resource ID to inflate 12963 * @param root A view group that will be the parent. Used to properly inflate the 12964 * layout_* parameters. 12965 * @see LayoutInflater 12966 */ 12967 public static View inflate(Context context, int resource, ViewGroup root) { 12968 LayoutInflater factory = LayoutInflater.from(context); 12969 return factory.inflate(resource, root); 12970 } 12971 12972 /** 12973 * Scroll the view with standard behavior for scrolling beyond the normal 12974 * content boundaries. Views that call this method should override 12975 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 12976 * results of an over-scroll operation. 12977 * 12978 * Views can use this method to handle any touch or fling-based scrolling. 12979 * 12980 * @param deltaX Change in X in pixels 12981 * @param deltaY Change in Y in pixels 12982 * @param scrollX Current X scroll value in pixels before applying deltaX 12983 * @param scrollY Current Y scroll value in pixels before applying deltaY 12984 * @param scrollRangeX Maximum content scroll range along the X axis 12985 * @param scrollRangeY Maximum content scroll range along the Y axis 12986 * @param maxOverScrollX Number of pixels to overscroll by in either direction 12987 * along the X axis. 12988 * @param maxOverScrollY Number of pixels to overscroll by in either direction 12989 * along the Y axis. 12990 * @param isTouchEvent true if this scroll operation is the result of a touch event. 12991 * @return true if scrolling was clamped to an over-scroll boundary along either 12992 * axis, false otherwise. 12993 */ 12994 @SuppressWarnings({"UnusedParameters"}) 12995 protected boolean overScrollBy(int deltaX, int deltaY, 12996 int scrollX, int scrollY, 12997 int scrollRangeX, int scrollRangeY, 12998 int maxOverScrollX, int maxOverScrollY, 12999 boolean isTouchEvent) { 13000 final int overScrollMode = mOverScrollMode; 13001 final boolean canScrollHorizontal = 13002 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 13003 final boolean canScrollVertical = 13004 computeVerticalScrollRange() > computeVerticalScrollExtent(); 13005 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 13006 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 13007 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 13008 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 13009 13010 int newScrollX = scrollX + deltaX; 13011 if (!overScrollHorizontal) { 13012 maxOverScrollX = 0; 13013 } 13014 13015 int newScrollY = scrollY + deltaY; 13016 if (!overScrollVertical) { 13017 maxOverScrollY = 0; 13018 } 13019 13020 // Clamp values if at the limits and record 13021 final int left = -maxOverScrollX; 13022 final int right = maxOverScrollX + scrollRangeX; 13023 final int top = -maxOverScrollY; 13024 final int bottom = maxOverScrollY + scrollRangeY; 13025 13026 boolean clampedX = false; 13027 if (newScrollX > right) { 13028 newScrollX = right; 13029 clampedX = true; 13030 } else if (newScrollX < left) { 13031 newScrollX = left; 13032 clampedX = true; 13033 } 13034 13035 boolean clampedY = false; 13036 if (newScrollY > bottom) { 13037 newScrollY = bottom; 13038 clampedY = true; 13039 } else if (newScrollY < top) { 13040 newScrollY = top; 13041 clampedY = true; 13042 } 13043 13044 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 13045 13046 return clampedX || clampedY; 13047 } 13048 13049 /** 13050 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 13051 * respond to the results of an over-scroll operation. 13052 * 13053 * @param scrollX New X scroll value in pixels 13054 * @param scrollY New Y scroll value in pixels 13055 * @param clampedX True if scrollX was clamped to an over-scroll boundary 13056 * @param clampedY True if scrollY was clamped to an over-scroll boundary 13057 */ 13058 protected void onOverScrolled(int scrollX, int scrollY, 13059 boolean clampedX, boolean clampedY) { 13060 // Intentionally empty. 13061 } 13062 13063 /** 13064 * Returns the over-scroll mode for this view. The result will be 13065 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13066 * (allow over-scrolling only if the view content is larger than the container), 13067 * or {@link #OVER_SCROLL_NEVER}. 13068 * 13069 * @return This view's over-scroll mode. 13070 */ 13071 public int getOverScrollMode() { 13072 return mOverScrollMode; 13073 } 13074 13075 /** 13076 * Set the over-scroll mode for this view. Valid over-scroll modes are 13077 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13078 * (allow over-scrolling only if the view content is larger than the container), 13079 * or {@link #OVER_SCROLL_NEVER}. 13080 * 13081 * Setting the over-scroll mode of a view will have an effect only if the 13082 * view is capable of scrolling. 13083 * 13084 * @param overScrollMode The new over-scroll mode for this view. 13085 */ 13086 public void setOverScrollMode(int overScrollMode) { 13087 if (overScrollMode != OVER_SCROLL_ALWAYS && 13088 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 13089 overScrollMode != OVER_SCROLL_NEVER) { 13090 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 13091 } 13092 mOverScrollMode = overScrollMode; 13093 } 13094 13095 /** 13096 * Gets a scale factor that determines the distance the view should scroll 13097 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 13098 * @return The vertical scroll scale factor. 13099 * @hide 13100 */ 13101 protected float getVerticalScrollFactor() { 13102 if (mVerticalScrollFactor == 0) { 13103 TypedValue outValue = new TypedValue(); 13104 if (!mContext.getTheme().resolveAttribute( 13105 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 13106 throw new IllegalStateException( 13107 "Expected theme to define listPreferredItemHeight."); 13108 } 13109 mVerticalScrollFactor = outValue.getDimension( 13110 mContext.getResources().getDisplayMetrics()); 13111 } 13112 return mVerticalScrollFactor; 13113 } 13114 13115 /** 13116 * Gets a scale factor that determines the distance the view should scroll 13117 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 13118 * @return The horizontal scroll scale factor. 13119 * @hide 13120 */ 13121 protected float getHorizontalScrollFactor() { 13122 // TODO: Should use something else. 13123 return getVerticalScrollFactor(); 13124 } 13125 13126 /** 13127 * Return the value specifying the text direction or policy that was set with 13128 * {@link #setTextDirection(int)}. 13129 * 13130 * @return the defined text direction. It can be one of: 13131 * 13132 * {@link #TEXT_DIRECTION_INHERIT}, 13133 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13134 * {@link #TEXT_DIRECTION_ANY_RTL}, 13135 * {@link #TEXT_DIRECTION_CHAR_COUNT}, 13136 * {@link #TEXT_DIRECTION_LTR}, 13137 * {@link #TEXT_DIRECTION_RTL}, 13138 * 13139 * @hide 13140 */ 13141 public int getTextDirection() { 13142 return mTextDirection; 13143 } 13144 13145 /** 13146 * Set the text direction. 13147 * 13148 * @param textDirection the direction to set. Should be one of: 13149 * 13150 * {@link #TEXT_DIRECTION_INHERIT}, 13151 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13152 * {@link #TEXT_DIRECTION_ANY_RTL}, 13153 * {@link #TEXT_DIRECTION_CHAR_COUNT}, 13154 * {@link #TEXT_DIRECTION_LTR}, 13155 * {@link #TEXT_DIRECTION_RTL}, 13156 * 13157 * @hide 13158 */ 13159 public void setTextDirection(int textDirection) { 13160 if (textDirection != mTextDirection) { 13161 mTextDirection = textDirection; 13162 resetResolvedTextDirection(); 13163 requestLayout(); 13164 } 13165 } 13166 13167 /** 13168 * Return the resolved text direction. 13169 * 13170 * @return the resolved text direction. Return one of: 13171 * 13172 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13173 * {@link #TEXT_DIRECTION_ANY_RTL}, 13174 * {@link #TEXT_DIRECTION_CHAR_COUNT}, 13175 * {@link #TEXT_DIRECTION_LTR}, 13176 * {@link #TEXT_DIRECTION_RTL}, 13177 * 13178 * @hide 13179 */ 13180 public int getResolvedTextDirection() { 13181 if (mResolvedTextDirection == TEXT_DIRECTION_INHERIT) { 13182 resolveTextDirection(); 13183 } 13184 return mResolvedTextDirection; 13185 } 13186 13187 /** 13188 * Resolve the text direction. 13189 */ 13190 protected void resolveTextDirection() { 13191 if (mTextDirection != TEXT_DIRECTION_INHERIT) { 13192 mResolvedTextDirection = mTextDirection; 13193 return; 13194 } 13195 if (mParent != null && mParent instanceof ViewGroup) { 13196 mResolvedTextDirection = ((ViewGroup) mParent).getResolvedTextDirection(); 13197 return; 13198 } 13199 mResolvedTextDirection = TEXT_DIRECTION_FIRST_STRONG; 13200 } 13201 13202 /** 13203 * Reset resolved text direction. Will be resolved during a call to getResolvedTextDirection(). 13204 */ 13205 protected void resetResolvedTextDirection() { 13206 mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 13207 } 13208 13209 // 13210 // Properties 13211 // 13212 /** 13213 * A Property wrapper around the <code>alpha</code> functionality handled by the 13214 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 13215 */ 13216 public static Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 13217 @Override 13218 public void setValue(View object, float value) { 13219 object.setAlpha(value); 13220 } 13221 13222 @Override 13223 public Float get(View object) { 13224 return object.getAlpha(); 13225 } 13226 }; 13227 13228 /** 13229 * A Property wrapper around the <code>translationX</code> functionality handled by the 13230 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 13231 */ 13232 public static Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 13233 @Override 13234 public void setValue(View object, float value) { 13235 object.setTranslationX(value); 13236 } 13237 13238 @Override 13239 public Float get(View object) { 13240 return object.getTranslationX(); 13241 } 13242 }; 13243 13244 /** 13245 * A Property wrapper around the <code>translationY</code> functionality handled by the 13246 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 13247 */ 13248 public static Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 13249 @Override 13250 public void setValue(View object, float value) { 13251 object.setTranslationY(value); 13252 } 13253 13254 @Override 13255 public Float get(View object) { 13256 return object.getTranslationY(); 13257 } 13258 }; 13259 13260 /** 13261 * A Property wrapper around the <code>x</code> functionality handled by the 13262 * {@link View#setX(float)} and {@link View#getX()} methods. 13263 */ 13264 public static Property<View, Float> X = new FloatProperty<View>("x") { 13265 @Override 13266 public void setValue(View object, float value) { 13267 object.setX(value); 13268 } 13269 13270 @Override 13271 public Float get(View object) { 13272 return object.getX(); 13273 } 13274 }; 13275 13276 /** 13277 * A Property wrapper around the <code>y</code> functionality handled by the 13278 * {@link View#setY(float)} and {@link View#getY()} methods. 13279 */ 13280 public static Property<View, Float> Y = new FloatProperty<View>("y") { 13281 @Override 13282 public void setValue(View object, float value) { 13283 object.setY(value); 13284 } 13285 13286 @Override 13287 public Float get(View object) { 13288 return object.getY(); 13289 } 13290 }; 13291 13292 /** 13293 * A Property wrapper around the <code>rotation</code> functionality handled by the 13294 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 13295 */ 13296 public static Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 13297 @Override 13298 public void setValue(View object, float value) { 13299 object.setRotation(value); 13300 } 13301 13302 @Override 13303 public Float get(View object) { 13304 return object.getRotation(); 13305 } 13306 }; 13307 13308 /** 13309 * A Property wrapper around the <code>rotationX</code> functionality handled by the 13310 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 13311 */ 13312 public static Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 13313 @Override 13314 public void setValue(View object, float value) { 13315 object.setRotationX(value); 13316 } 13317 13318 @Override 13319 public Float get(View object) { 13320 return object.getRotationX(); 13321 } 13322 }; 13323 13324 /** 13325 * A Property wrapper around the <code>rotationY</code> functionality handled by the 13326 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 13327 */ 13328 public static Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 13329 @Override 13330 public void setValue(View object, float value) { 13331 object.setRotationY(value); 13332 } 13333 13334 @Override 13335 public Float get(View object) { 13336 return object.getRotationY(); 13337 } 13338 }; 13339 13340 /** 13341 * A Property wrapper around the <code>scaleX</code> functionality handled by the 13342 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 13343 */ 13344 public static Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 13345 @Override 13346 public void setValue(View object, float value) { 13347 object.setScaleX(value); 13348 } 13349 13350 @Override 13351 public Float get(View object) { 13352 return object.getScaleX(); 13353 } 13354 }; 13355 13356 /** 13357 * A Property wrapper around the <code>scaleY</code> functionality handled by the 13358 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 13359 */ 13360 public static Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 13361 @Override 13362 public void setValue(View object, float value) { 13363 object.setScaleY(value); 13364 } 13365 13366 @Override 13367 public Float get(View object) { 13368 return object.getScaleY(); 13369 } 13370 }; 13371 13372 /** 13373 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 13374 * Each MeasureSpec represents a requirement for either the width or the height. 13375 * A MeasureSpec is comprised of a size and a mode. There are three possible 13376 * modes: 13377 * <dl> 13378 * <dt>UNSPECIFIED</dt> 13379 * <dd> 13380 * The parent has not imposed any constraint on the child. It can be whatever size 13381 * it wants. 13382 * </dd> 13383 * 13384 * <dt>EXACTLY</dt> 13385 * <dd> 13386 * The parent has determined an exact size for the child. The child is going to be 13387 * given those bounds regardless of how big it wants to be. 13388 * </dd> 13389 * 13390 * <dt>AT_MOST</dt> 13391 * <dd> 13392 * The child can be as large as it wants up to the specified size. 13393 * </dd> 13394 * </dl> 13395 * 13396 * MeasureSpecs are implemented as ints to reduce object allocation. This class 13397 * is provided to pack and unpack the <size, mode> tuple into the int. 13398 */ 13399 public static class MeasureSpec { 13400 private static final int MODE_SHIFT = 30; 13401 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 13402 13403 /** 13404 * Measure specification mode: The parent has not imposed any constraint 13405 * on the child. It can be whatever size it wants. 13406 */ 13407 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 13408 13409 /** 13410 * Measure specification mode: The parent has determined an exact size 13411 * for the child. The child is going to be given those bounds regardless 13412 * of how big it wants to be. 13413 */ 13414 public static final int EXACTLY = 1 << MODE_SHIFT; 13415 13416 /** 13417 * Measure specification mode: The child can be as large as it wants up 13418 * to the specified size. 13419 */ 13420 public static final int AT_MOST = 2 << MODE_SHIFT; 13421 13422 /** 13423 * Creates a measure specification based on the supplied size and mode. 13424 * 13425 * The mode must always be one of the following: 13426 * <ul> 13427 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 13428 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 13429 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 13430 * </ul> 13431 * 13432 * @param size the size of the measure specification 13433 * @param mode the mode of the measure specification 13434 * @return the measure specification based on size and mode 13435 */ 13436 public static int makeMeasureSpec(int size, int mode) { 13437 return size + mode; 13438 } 13439 13440 /** 13441 * Extracts the mode from the supplied measure specification. 13442 * 13443 * @param measureSpec the measure specification to extract the mode from 13444 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 13445 * {@link android.view.View.MeasureSpec#AT_MOST} or 13446 * {@link android.view.View.MeasureSpec#EXACTLY} 13447 */ 13448 public static int getMode(int measureSpec) { 13449 return (measureSpec & MODE_MASK); 13450 } 13451 13452 /** 13453 * Extracts the size from the supplied measure specification. 13454 * 13455 * @param measureSpec the measure specification to extract the size from 13456 * @return the size in pixels defined in the supplied measure specification 13457 */ 13458 public static int getSize(int measureSpec) { 13459 return (measureSpec & ~MODE_MASK); 13460 } 13461 13462 /** 13463 * Returns a String representation of the specified measure 13464 * specification. 13465 * 13466 * @param measureSpec the measure specification to convert to a String 13467 * @return a String with the following format: "MeasureSpec: MODE SIZE" 13468 */ 13469 public static String toString(int measureSpec) { 13470 int mode = getMode(measureSpec); 13471 int size = getSize(measureSpec); 13472 13473 StringBuilder sb = new StringBuilder("MeasureSpec: "); 13474 13475 if (mode == UNSPECIFIED) 13476 sb.append("UNSPECIFIED "); 13477 else if (mode == EXACTLY) 13478 sb.append("EXACTLY "); 13479 else if (mode == AT_MOST) 13480 sb.append("AT_MOST "); 13481 else 13482 sb.append(mode).append(" "); 13483 13484 sb.append(size); 13485 return sb.toString(); 13486 } 13487 } 13488 13489 class CheckForLongPress implements Runnable { 13490 13491 private int mOriginalWindowAttachCount; 13492 13493 public void run() { 13494 if (isPressed() && (mParent != null) 13495 && mOriginalWindowAttachCount == mWindowAttachCount) { 13496 if (performLongClick()) { 13497 mHasPerformedLongPress = true; 13498 } 13499 } 13500 } 13501 13502 public void rememberWindowAttachCount() { 13503 mOriginalWindowAttachCount = mWindowAttachCount; 13504 } 13505 } 13506 13507 private final class CheckForTap implements Runnable { 13508 public void run() { 13509 mPrivateFlags &= ~PREPRESSED; 13510 mPrivateFlags |= PRESSED; 13511 refreshDrawableState(); 13512 checkForLongClick(ViewConfiguration.getTapTimeout()); 13513 } 13514 } 13515 13516 private final class PerformClick implements Runnable { 13517 public void run() { 13518 performClick(); 13519 } 13520 } 13521 13522 /** @hide */ 13523 public void hackTurnOffWindowResizeAnim(boolean off) { 13524 mAttachInfo.mTurnOffWindowResizeAnim = off; 13525 } 13526 13527 /** 13528 * This method returns a ViewPropertyAnimator object, which can be used to animate 13529 * specific properties on this View. 13530 * 13531 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 13532 */ 13533 public ViewPropertyAnimator animate() { 13534 if (mAnimator == null) { 13535 mAnimator = new ViewPropertyAnimator(this); 13536 } 13537 return mAnimator; 13538 } 13539 13540 /** 13541 * Interface definition for a callback to be invoked when a key event is 13542 * dispatched to this view. The callback will be invoked before the key 13543 * event is given to the view. 13544 */ 13545 public interface OnKeyListener { 13546 /** 13547 * Called when a key is dispatched to a view. This allows listeners to 13548 * get a chance to respond before the target view. 13549 * 13550 * @param v The view the key has been dispatched to. 13551 * @param keyCode The code for the physical key that was pressed 13552 * @param event The KeyEvent object containing full information about 13553 * the event. 13554 * @return True if the listener has consumed the event, false otherwise. 13555 */ 13556 boolean onKey(View v, int keyCode, KeyEvent event); 13557 } 13558 13559 /** 13560 * Interface definition for a callback to be invoked when a touch event is 13561 * dispatched to this view. The callback will be invoked before the touch 13562 * event is given to the view. 13563 */ 13564 public interface OnTouchListener { 13565 /** 13566 * Called when a touch event is dispatched to a view. This allows listeners to 13567 * get a chance to respond before the target view. 13568 * 13569 * @param v The view the touch event has been dispatched to. 13570 * @param event The MotionEvent object containing full information about 13571 * the event. 13572 * @return True if the listener has consumed the event, false otherwise. 13573 */ 13574 boolean onTouch(View v, MotionEvent event); 13575 } 13576 13577 /** 13578 * Interface definition for a callback to be invoked when a hover event is 13579 * dispatched to this view. The callback will be invoked before the hover 13580 * event is given to the view. 13581 */ 13582 public interface OnHoverListener { 13583 /** 13584 * Called when a hover event is dispatched to a view. This allows listeners to 13585 * get a chance to respond before the target view. 13586 * 13587 * @param v The view the hover event has been dispatched to. 13588 * @param event The MotionEvent object containing full information about 13589 * the event. 13590 * @return True if the listener has consumed the event, false otherwise. 13591 */ 13592 boolean onHover(View v, MotionEvent event); 13593 } 13594 13595 /** 13596 * Interface definition for a callback to be invoked when a generic motion event is 13597 * dispatched to this view. The callback will be invoked before the generic motion 13598 * event is given to the view. 13599 */ 13600 public interface OnGenericMotionListener { 13601 /** 13602 * Called when a generic motion event is dispatched to a view. This allows listeners to 13603 * get a chance to respond before the target view. 13604 * 13605 * @param v The view the generic motion event has been dispatched to. 13606 * @param event The MotionEvent object containing full information about 13607 * the event. 13608 * @return True if the listener has consumed the event, false otherwise. 13609 */ 13610 boolean onGenericMotion(View v, MotionEvent event); 13611 } 13612 13613 /** 13614 * Interface definition for a callback to be invoked when a view has been clicked and held. 13615 */ 13616 public interface OnLongClickListener { 13617 /** 13618 * Called when a view has been clicked and held. 13619 * 13620 * @param v The view that was clicked and held. 13621 * 13622 * @return true if the callback consumed the long click, false otherwise. 13623 */ 13624 boolean onLongClick(View v); 13625 } 13626 13627 /** 13628 * Interface definition for a callback to be invoked when a drag is being dispatched 13629 * to this view. The callback will be invoked before the hosting view's own 13630 * onDrag(event) method. If the listener wants to fall back to the hosting view's 13631 * onDrag(event) behavior, it should return 'false' from this callback. 13632 */ 13633 public interface OnDragListener { 13634 /** 13635 * Called when a drag event is dispatched to a view. This allows listeners 13636 * to get a chance to override base View behavior. 13637 * 13638 * @param v The View that received the drag event. 13639 * @param event The {@link android.view.DragEvent} object for the drag event. 13640 * @return {@code true} if the drag event was handled successfully, or {@code false} 13641 * if the drag event was not handled. Note that {@code false} will trigger the View 13642 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 13643 */ 13644 boolean onDrag(View v, DragEvent event); 13645 } 13646 13647 /** 13648 * Interface definition for a callback to be invoked when the focus state of 13649 * a view changed. 13650 */ 13651 public interface OnFocusChangeListener { 13652 /** 13653 * Called when the focus state of a view has changed. 13654 * 13655 * @param v The view whose state has changed. 13656 * @param hasFocus The new focus state of v. 13657 */ 13658 void onFocusChange(View v, boolean hasFocus); 13659 } 13660 13661 /** 13662 * Interface definition for a callback to be invoked when a view is clicked. 13663 */ 13664 public interface OnClickListener { 13665 /** 13666 * Called when a view has been clicked. 13667 * 13668 * @param v The view that was clicked. 13669 */ 13670 void onClick(View v); 13671 } 13672 13673 /** 13674 * Interface definition for a callback to be invoked when the context menu 13675 * for this view is being built. 13676 */ 13677 public interface OnCreateContextMenuListener { 13678 /** 13679 * Called when the context menu for this view is being built. It is not 13680 * safe to hold onto the menu after this method returns. 13681 * 13682 * @param menu The context menu that is being built 13683 * @param v The view for which the context menu is being built 13684 * @param menuInfo Extra information about the item for which the 13685 * context menu should be shown. This information will vary 13686 * depending on the class of v. 13687 */ 13688 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 13689 } 13690 13691 /** 13692 * Interface definition for a callback to be invoked when the status bar changes 13693 * visibility. 13694 * 13695 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 13696 */ 13697 public interface OnSystemUiVisibilityChangeListener { 13698 /** 13699 * Called when the status bar changes visibility because of a call to 13700 * {@link View#setSystemUiVisibility(int)}. 13701 * 13702 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13703 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13704 */ 13705 public void onSystemUiVisibilityChange(int visibility); 13706 } 13707 13708 /** 13709 * Interface definition for a callback to be invoked when this view is attached 13710 * or detached from its window. 13711 */ 13712 public interface OnAttachStateChangeListener { 13713 /** 13714 * Called when the view is attached to a window. 13715 * @param v The view that was attached 13716 */ 13717 public void onViewAttachedToWindow(View v); 13718 /** 13719 * Called when the view is detached from a window. 13720 * @param v The view that was detached 13721 */ 13722 public void onViewDetachedFromWindow(View v); 13723 } 13724 13725 private final class UnsetPressedState implements Runnable { 13726 public void run() { 13727 setPressed(false); 13728 } 13729 } 13730 13731 /** 13732 * Base class for derived classes that want to save and restore their own 13733 * state in {@link android.view.View#onSaveInstanceState()}. 13734 */ 13735 public static class BaseSavedState extends AbsSavedState { 13736 /** 13737 * Constructor used when reading from a parcel. Reads the state of the superclass. 13738 * 13739 * @param source 13740 */ 13741 public BaseSavedState(Parcel source) { 13742 super(source); 13743 } 13744 13745 /** 13746 * Constructor called by derived classes when creating their SavedState objects 13747 * 13748 * @param superState The state of the superclass of this view 13749 */ 13750 public BaseSavedState(Parcelable superState) { 13751 super(superState); 13752 } 13753 13754 public static final Parcelable.Creator<BaseSavedState> CREATOR = 13755 new Parcelable.Creator<BaseSavedState>() { 13756 public BaseSavedState createFromParcel(Parcel in) { 13757 return new BaseSavedState(in); 13758 } 13759 13760 public BaseSavedState[] newArray(int size) { 13761 return new BaseSavedState[size]; 13762 } 13763 }; 13764 } 13765 13766 /** 13767 * A set of information given to a view when it is attached to its parent 13768 * window. 13769 */ 13770 static class AttachInfo { 13771 interface Callbacks { 13772 void playSoundEffect(int effectId); 13773 boolean performHapticFeedback(int effectId, boolean always); 13774 } 13775 13776 /** 13777 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 13778 * to a Handler. This class contains the target (View) to invalidate and 13779 * the coordinates of the dirty rectangle. 13780 * 13781 * For performance purposes, this class also implements a pool of up to 13782 * POOL_LIMIT objects that get reused. This reduces memory allocations 13783 * whenever possible. 13784 */ 13785 static class InvalidateInfo implements Poolable<InvalidateInfo> { 13786 private static final int POOL_LIMIT = 10; 13787 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 13788 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 13789 public InvalidateInfo newInstance() { 13790 return new InvalidateInfo(); 13791 } 13792 13793 public void onAcquired(InvalidateInfo element) { 13794 } 13795 13796 public void onReleased(InvalidateInfo element) { 13797 } 13798 }, POOL_LIMIT) 13799 ); 13800 13801 private InvalidateInfo mNext; 13802 private boolean mIsPooled; 13803 13804 View target; 13805 13806 int left; 13807 int top; 13808 int right; 13809 int bottom; 13810 13811 public void setNextPoolable(InvalidateInfo element) { 13812 mNext = element; 13813 } 13814 13815 public InvalidateInfo getNextPoolable() { 13816 return mNext; 13817 } 13818 13819 static InvalidateInfo acquire() { 13820 return sPool.acquire(); 13821 } 13822 13823 void release() { 13824 sPool.release(this); 13825 } 13826 13827 public boolean isPooled() { 13828 return mIsPooled; 13829 } 13830 13831 public void setPooled(boolean isPooled) { 13832 mIsPooled = isPooled; 13833 } 13834 } 13835 13836 final IWindowSession mSession; 13837 13838 final IWindow mWindow; 13839 13840 final IBinder mWindowToken; 13841 13842 final Callbacks mRootCallbacks; 13843 13844 HardwareCanvas mHardwareCanvas; 13845 13846 /** 13847 * The top view of the hierarchy. 13848 */ 13849 View mRootView; 13850 13851 IBinder mPanelParentWindowToken; 13852 Surface mSurface; 13853 13854 boolean mHardwareAccelerated; 13855 boolean mHardwareAccelerationRequested; 13856 HardwareRenderer mHardwareRenderer; 13857 13858 /** 13859 * Scale factor used by the compatibility mode 13860 */ 13861 float mApplicationScale; 13862 13863 /** 13864 * Indicates whether the application is in compatibility mode 13865 */ 13866 boolean mScalingRequired; 13867 13868 /** 13869 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 13870 */ 13871 boolean mTurnOffWindowResizeAnim; 13872 13873 /** 13874 * Left position of this view's window 13875 */ 13876 int mWindowLeft; 13877 13878 /** 13879 * Top position of this view's window 13880 */ 13881 int mWindowTop; 13882 13883 /** 13884 * Indicates whether views need to use 32-bit drawing caches 13885 */ 13886 boolean mUse32BitDrawingCache; 13887 13888 /** 13889 * For windows that are full-screen but using insets to layout inside 13890 * of the screen decorations, these are the current insets for the 13891 * content of the window. 13892 */ 13893 final Rect mContentInsets = new Rect(); 13894 13895 /** 13896 * For windows that are full-screen but using insets to layout inside 13897 * of the screen decorations, these are the current insets for the 13898 * actual visible parts of the window. 13899 */ 13900 final Rect mVisibleInsets = new Rect(); 13901 13902 /** 13903 * The internal insets given by this window. This value is 13904 * supplied by the client (through 13905 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 13906 * be given to the window manager when changed to be used in laying 13907 * out windows behind it. 13908 */ 13909 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 13910 = new ViewTreeObserver.InternalInsetsInfo(); 13911 13912 /** 13913 * All views in the window's hierarchy that serve as scroll containers, 13914 * used to determine if the window can be resized or must be panned 13915 * to adjust for a soft input area. 13916 */ 13917 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 13918 13919 final KeyEvent.DispatcherState mKeyDispatchState 13920 = new KeyEvent.DispatcherState(); 13921 13922 /** 13923 * Indicates whether the view's window currently has the focus. 13924 */ 13925 boolean mHasWindowFocus; 13926 13927 /** 13928 * The current visibility of the window. 13929 */ 13930 int mWindowVisibility; 13931 13932 /** 13933 * Indicates the time at which drawing started to occur. 13934 */ 13935 long mDrawingTime; 13936 13937 /** 13938 * Indicates whether or not ignoring the DIRTY_MASK flags. 13939 */ 13940 boolean mIgnoreDirtyState; 13941 13942 /** 13943 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 13944 * to avoid clearing that flag prematurely. 13945 */ 13946 boolean mSetIgnoreDirtyState = false; 13947 13948 /** 13949 * Indicates whether the view's window is currently in touch mode. 13950 */ 13951 boolean mInTouchMode; 13952 13953 /** 13954 * Indicates that ViewAncestor should trigger a global layout change 13955 * the next time it performs a traversal 13956 */ 13957 boolean mRecomputeGlobalAttributes; 13958 13959 /** 13960 * Set during a traveral if any views want to keep the screen on. 13961 */ 13962 boolean mKeepScreenOn; 13963 13964 /** 13965 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 13966 */ 13967 int mSystemUiVisibility; 13968 13969 /** 13970 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 13971 * attached. 13972 */ 13973 boolean mHasSystemUiListeners; 13974 13975 /** 13976 * Set if the visibility of any views has changed. 13977 */ 13978 boolean mViewVisibilityChanged; 13979 13980 /** 13981 * Set to true if a view has been scrolled. 13982 */ 13983 boolean mViewScrollChanged; 13984 13985 /** 13986 * Global to the view hierarchy used as a temporary for dealing with 13987 * x/y points in the transparent region computations. 13988 */ 13989 final int[] mTransparentLocation = new int[2]; 13990 13991 /** 13992 * Global to the view hierarchy used as a temporary for dealing with 13993 * x/y points in the ViewGroup.invalidateChild implementation. 13994 */ 13995 final int[] mInvalidateChildLocation = new int[2]; 13996 13997 13998 /** 13999 * Global to the view hierarchy used as a temporary for dealing with 14000 * x/y location when view is transformed. 14001 */ 14002 final float[] mTmpTransformLocation = new float[2]; 14003 14004 /** 14005 * The view tree observer used to dispatch global events like 14006 * layout, pre-draw, touch mode change, etc. 14007 */ 14008 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 14009 14010 /** 14011 * A Canvas used by the view hierarchy to perform bitmap caching. 14012 */ 14013 Canvas mCanvas; 14014 14015 /** 14016 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 14017 * handler can be used to pump events in the UI events queue. 14018 */ 14019 final Handler mHandler; 14020 14021 /** 14022 * Identifier for messages requesting the view to be invalidated. 14023 * Such messages should be sent to {@link #mHandler}. 14024 */ 14025 static final int INVALIDATE_MSG = 0x1; 14026 14027 /** 14028 * Identifier for messages requesting the view to invalidate a region. 14029 * Such messages should be sent to {@link #mHandler}. 14030 */ 14031 static final int INVALIDATE_RECT_MSG = 0x2; 14032 14033 /** 14034 * Temporary for use in computing invalidate rectangles while 14035 * calling up the hierarchy. 14036 */ 14037 final Rect mTmpInvalRect = new Rect(); 14038 14039 /** 14040 * Temporary for use in computing hit areas with transformed views 14041 */ 14042 final RectF mTmpTransformRect = new RectF(); 14043 14044 /** 14045 * Temporary list for use in collecting focusable descendents of a view. 14046 */ 14047 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 14048 14049 /** 14050 * The id of the window for accessibility purposes. 14051 */ 14052 int mAccessibilityWindowId = View.NO_ID; 14053 14054 /** 14055 * Creates a new set of attachment information with the specified 14056 * events handler and thread. 14057 * 14058 * @param handler the events handler the view must use 14059 */ 14060 AttachInfo(IWindowSession session, IWindow window, 14061 Handler handler, Callbacks effectPlayer) { 14062 mSession = session; 14063 mWindow = window; 14064 mWindowToken = window.asBinder(); 14065 mHandler = handler; 14066 mRootCallbacks = effectPlayer; 14067 } 14068 } 14069 14070 /** 14071 * <p>ScrollabilityCache holds various fields used by a View when scrolling 14072 * is supported. This avoids keeping too many unused fields in most 14073 * instances of View.</p> 14074 */ 14075 private static class ScrollabilityCache implements Runnable { 14076 14077 /** 14078 * Scrollbars are not visible 14079 */ 14080 public static final int OFF = 0; 14081 14082 /** 14083 * Scrollbars are visible 14084 */ 14085 public static final int ON = 1; 14086 14087 /** 14088 * Scrollbars are fading away 14089 */ 14090 public static final int FADING = 2; 14091 14092 public boolean fadeScrollBars; 14093 14094 public int fadingEdgeLength; 14095 public int scrollBarDefaultDelayBeforeFade; 14096 public int scrollBarFadeDuration; 14097 14098 public int scrollBarSize; 14099 public ScrollBarDrawable scrollBar; 14100 public float[] interpolatorValues; 14101 public View host; 14102 14103 public final Paint paint; 14104 public final Matrix matrix; 14105 public Shader shader; 14106 14107 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 14108 14109 private static final float[] OPAQUE = { 255 }; 14110 private static final float[] TRANSPARENT = { 0.0f }; 14111 14112 /** 14113 * When fading should start. This time moves into the future every time 14114 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 14115 */ 14116 public long fadeStartTime; 14117 14118 14119 /** 14120 * The current state of the scrollbars: ON, OFF, or FADING 14121 */ 14122 public int state = OFF; 14123 14124 private int mLastColor; 14125 14126 public ScrollabilityCache(ViewConfiguration configuration, View host) { 14127 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 14128 scrollBarSize = configuration.getScaledScrollBarSize(); 14129 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 14130 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 14131 14132 paint = new Paint(); 14133 matrix = new Matrix(); 14134 // use use a height of 1, and then wack the matrix each time we 14135 // actually use it. 14136 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 14137 14138 paint.setShader(shader); 14139 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 14140 this.host = host; 14141 } 14142 14143 public void setFadeColor(int color) { 14144 if (color != 0 && color != mLastColor) { 14145 mLastColor = color; 14146 color |= 0xFF000000; 14147 14148 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 14149 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 14150 14151 paint.setShader(shader); 14152 // Restore the default transfer mode (src_over) 14153 paint.setXfermode(null); 14154 } 14155 } 14156 14157 public void run() { 14158 long now = AnimationUtils.currentAnimationTimeMillis(); 14159 if (now >= fadeStartTime) { 14160 14161 // the animation fades the scrollbars out by changing 14162 // the opacity (alpha) from fully opaque to fully 14163 // transparent 14164 int nextFrame = (int) now; 14165 int framesCount = 0; 14166 14167 Interpolator interpolator = scrollBarInterpolator; 14168 14169 // Start opaque 14170 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 14171 14172 // End transparent 14173 nextFrame += scrollBarFadeDuration; 14174 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 14175 14176 state = FADING; 14177 14178 // Kick off the fade animation 14179 host.invalidate(true); 14180 } 14181 } 14182 } 14183 14184 /** 14185 * Resuable callback for sending 14186 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 14187 */ 14188 private class SendViewScrolledAccessibilityEvent implements Runnable { 14189 public volatile boolean mIsPending; 14190 14191 public void run() { 14192 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 14193 mIsPending = false; 14194 } 14195 } 14196} 14197