View.java revision e080af37544f5d7d0cc8140289ac96dd21a8742d
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.Callback, Drawable.Callback2, KeyEvent.Callback, 640 AccessibilityEventSource { 641 private static final boolean DBG = false; 642 643 /** 644 * The logging tag used by this class with android.util.Log. 645 */ 646 protected static final String VIEW_LOG_TAG = "View"; 647 648 /** 649 * Used to mark a View that has no ID. 650 */ 651 public static final int NO_ID = -1; 652 653 /** 654 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 655 * calling setFlags. 656 */ 657 private static final int NOT_FOCUSABLE = 0x00000000; 658 659 /** 660 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 661 * setFlags. 662 */ 663 private static final int FOCUSABLE = 0x00000001; 664 665 /** 666 * Mask for use with setFlags indicating bits used for focus. 667 */ 668 private static final int FOCUSABLE_MASK = 0x00000001; 669 670 /** 671 * This view will adjust its padding to fit sytem windows (e.g. status bar) 672 */ 673 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 674 675 /** 676 * This view is visible. 677 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 678 * android:visibility}. 679 */ 680 public static final int VISIBLE = 0x00000000; 681 682 /** 683 * This view is invisible, but it still takes up space for layout purposes. 684 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 685 * android:visibility}. 686 */ 687 public static final int INVISIBLE = 0x00000004; 688 689 /** 690 * This view is invisible, and it doesn't take any space for layout 691 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 692 * android:visibility}. 693 */ 694 public static final int GONE = 0x00000008; 695 696 /** 697 * Mask for use with setFlags indicating bits used for visibility. 698 * {@hide} 699 */ 700 static final int VISIBILITY_MASK = 0x0000000C; 701 702 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 703 704 /** 705 * This view is enabled. Intrepretation varies by subclass. 706 * Use with ENABLED_MASK when calling setFlags. 707 * {@hide} 708 */ 709 static final int ENABLED = 0x00000000; 710 711 /** 712 * This view is disabled. Intrepretation varies by subclass. 713 * Use with ENABLED_MASK when calling setFlags. 714 * {@hide} 715 */ 716 static final int DISABLED = 0x00000020; 717 718 /** 719 * Mask for use with setFlags indicating bits used for indicating whether 720 * this view is enabled 721 * {@hide} 722 */ 723 static final int ENABLED_MASK = 0x00000020; 724 725 /** 726 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 727 * called and further optimizations will be performed. It is okay to have 728 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 729 * {@hide} 730 */ 731 static final int WILL_NOT_DRAW = 0x00000080; 732 733 /** 734 * Mask for use with setFlags indicating bits used for indicating whether 735 * this view is will draw 736 * {@hide} 737 */ 738 static final int DRAW_MASK = 0x00000080; 739 740 /** 741 * <p>This view doesn't show scrollbars.</p> 742 * {@hide} 743 */ 744 static final int SCROLLBARS_NONE = 0x00000000; 745 746 /** 747 * <p>This view shows horizontal scrollbars.</p> 748 * {@hide} 749 */ 750 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 751 752 /** 753 * <p>This view shows vertical scrollbars.</p> 754 * {@hide} 755 */ 756 static final int SCROLLBARS_VERTICAL = 0x00000200; 757 758 /** 759 * <p>Mask for use with setFlags indicating bits used for indicating which 760 * scrollbars are enabled.</p> 761 * {@hide} 762 */ 763 static final int SCROLLBARS_MASK = 0x00000300; 764 765 /** 766 * Indicates that the view should filter touches when its window is obscured. 767 * Refer to the class comments for more information about this security feature. 768 * {@hide} 769 */ 770 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 771 772 // note flag value 0x00000800 is now available for next flags... 773 774 /** 775 * <p>This view doesn't show fading edges.</p> 776 * {@hide} 777 */ 778 static final int FADING_EDGE_NONE = 0x00000000; 779 780 /** 781 * <p>This view shows horizontal fading edges.</p> 782 * {@hide} 783 */ 784 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 785 786 /** 787 * <p>This view shows vertical fading edges.</p> 788 * {@hide} 789 */ 790 static final int FADING_EDGE_VERTICAL = 0x00002000; 791 792 /** 793 * <p>Mask for use with setFlags indicating bits used for indicating which 794 * fading edges are enabled.</p> 795 * {@hide} 796 */ 797 static final int FADING_EDGE_MASK = 0x00003000; 798 799 /** 800 * <p>Indicates this view can be clicked. When clickable, a View reacts 801 * to clicks by notifying the OnClickListener.<p> 802 * {@hide} 803 */ 804 static final int CLICKABLE = 0x00004000; 805 806 /** 807 * <p>Indicates this view is caching its drawing into a bitmap.</p> 808 * {@hide} 809 */ 810 static final int DRAWING_CACHE_ENABLED = 0x00008000; 811 812 /** 813 * <p>Indicates that no icicle should be saved for this view.<p> 814 * {@hide} 815 */ 816 static final int SAVE_DISABLED = 0x000010000; 817 818 /** 819 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 820 * property.</p> 821 * {@hide} 822 */ 823 static final int SAVE_DISABLED_MASK = 0x000010000; 824 825 /** 826 * <p>Indicates that no drawing cache should ever be created for this view.<p> 827 * {@hide} 828 */ 829 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 830 831 /** 832 * <p>Indicates this view can take / keep focus when int touch mode.</p> 833 * {@hide} 834 */ 835 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 836 837 /** 838 * <p>Enables low quality mode for the drawing cache.</p> 839 */ 840 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 841 842 /** 843 * <p>Enables high quality mode for the drawing cache.</p> 844 */ 845 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 846 847 /** 848 * <p>Enables automatic quality mode for the drawing cache.</p> 849 */ 850 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 851 852 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 853 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 854 }; 855 856 /** 857 * <p>Mask for use with setFlags indicating bits used for the cache 858 * quality property.</p> 859 * {@hide} 860 */ 861 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 862 863 /** 864 * <p> 865 * Indicates this view can be long clicked. When long clickable, a View 866 * reacts to long clicks by notifying the OnLongClickListener or showing a 867 * context menu. 868 * </p> 869 * {@hide} 870 */ 871 static final int LONG_CLICKABLE = 0x00200000; 872 873 /** 874 * <p>Indicates that this view gets its drawable states from its direct parent 875 * and ignores its original internal states.</p> 876 * 877 * @hide 878 */ 879 static final int DUPLICATE_PARENT_STATE = 0x00400000; 880 881 /** 882 * The scrollbar style to display the scrollbars inside the content area, 883 * without increasing the padding. The scrollbars will be overlaid with 884 * translucency on the view's content. 885 */ 886 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 887 888 /** 889 * The scrollbar style to display the scrollbars inside the padded area, 890 * increasing the padding of the view. The scrollbars will not overlap the 891 * content area of the view. 892 */ 893 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 894 895 /** 896 * The scrollbar style to display the scrollbars at the edge of the view, 897 * without increasing the padding. The scrollbars will be overlaid with 898 * translucency. 899 */ 900 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 901 902 /** 903 * The scrollbar style to display the scrollbars at the edge of the view, 904 * increasing the padding of the view. The scrollbars will only overlap the 905 * background, if any. 906 */ 907 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 908 909 /** 910 * Mask to check if the scrollbar style is overlay or inset. 911 * {@hide} 912 */ 913 static final int SCROLLBARS_INSET_MASK = 0x01000000; 914 915 /** 916 * Mask to check if the scrollbar style is inside or outside. 917 * {@hide} 918 */ 919 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 920 921 /** 922 * Mask for scrollbar style. 923 * {@hide} 924 */ 925 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 926 927 /** 928 * View flag indicating that the screen should remain on while the 929 * window containing this view is visible to the user. This effectively 930 * takes care of automatically setting the WindowManager's 931 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 932 */ 933 public static final int KEEP_SCREEN_ON = 0x04000000; 934 935 /** 936 * View flag indicating whether this view should have sound effects enabled 937 * for events such as clicking and touching. 938 */ 939 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 940 941 /** 942 * View flag indicating whether this view should have haptic feedback 943 * enabled for events such as long presses. 944 */ 945 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 946 947 /** 948 * <p>Indicates that the view hierarchy should stop saving state when 949 * it reaches this view. If state saving is initiated immediately at 950 * the view, it will be allowed. 951 * {@hide} 952 */ 953 static final int PARENT_SAVE_DISABLED = 0x20000000; 954 955 /** 956 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 957 * {@hide} 958 */ 959 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 960 961 /** 962 * Horizontal direction of this view is from Left to Right. 963 * Use with {@link #setLayoutDirection}. 964 * {@hide} 965 */ 966 public static final int LAYOUT_DIRECTION_LTR = 0x00000000; 967 968 /** 969 * Horizontal direction of this view is from Right to Left. 970 * Use with {@link #setLayoutDirection}. 971 * {@hide} 972 */ 973 public static final int LAYOUT_DIRECTION_RTL = 0x40000000; 974 975 /** 976 * Horizontal direction of this view is inherited from its parent. 977 * Use with {@link #setLayoutDirection}. 978 * {@hide} 979 */ 980 public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000; 981 982 /** 983 * Horizontal direction of this view is from deduced from the default language 984 * script for the locale. Use with {@link #setLayoutDirection}. 985 * {@hide} 986 */ 987 public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000; 988 989 /** 990 * Mask for use with setFlags indicating bits used for horizontalDirection. 991 * {@hide} 992 */ 993 static final int LAYOUT_DIRECTION_MASK = 0xC0000000; 994 995 /* 996 * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct 997 * flag value. 998 * {@hide} 999 */ 1000 private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR, 1001 LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE}; 1002 1003 /** 1004 * Default horizontalDirection. 1005 * {@hide} 1006 */ 1007 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1008 1009 /** 1010 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1011 * should add all focusable Views regardless if they are focusable in touch mode. 1012 */ 1013 public static final int FOCUSABLES_ALL = 0x00000000; 1014 1015 /** 1016 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1017 * should add only Views focusable in touch mode. 1018 */ 1019 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1020 1021 /** 1022 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1023 * item. 1024 */ 1025 public static final int FOCUS_BACKWARD = 0x00000001; 1026 1027 /** 1028 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1029 * item. 1030 */ 1031 public static final int FOCUS_FORWARD = 0x00000002; 1032 1033 /** 1034 * Use with {@link #focusSearch(int)}. Move focus to the left. 1035 */ 1036 public static final int FOCUS_LEFT = 0x00000011; 1037 1038 /** 1039 * Use with {@link #focusSearch(int)}. Move focus up. 1040 */ 1041 public static final int FOCUS_UP = 0x00000021; 1042 1043 /** 1044 * Use with {@link #focusSearch(int)}. Move focus to the right. 1045 */ 1046 public static final int FOCUS_RIGHT = 0x00000042; 1047 1048 /** 1049 * Use with {@link #focusSearch(int)}. Move focus down. 1050 */ 1051 public static final int FOCUS_DOWN = 0x00000082; 1052 1053 /** 1054 * Bits of {@link #getMeasuredWidthAndState()} and 1055 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1056 */ 1057 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1058 1059 /** 1060 * Bits of {@link #getMeasuredWidthAndState()} and 1061 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1062 */ 1063 public static final int MEASURED_STATE_MASK = 0xff000000; 1064 1065 /** 1066 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1067 * for functions that combine both width and height into a single int, 1068 * such as {@link #getMeasuredState()} and the childState argument of 1069 * {@link #resolveSizeAndState(int, int, int)}. 1070 */ 1071 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1072 1073 /** 1074 * Bit of {@link #getMeasuredWidthAndState()} and 1075 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1076 * is smaller that the space the view would like to have. 1077 */ 1078 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1079 1080 /** 1081 * Base View state sets 1082 */ 1083 // Singles 1084 /** 1085 * Indicates the view has no states set. States are used with 1086 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1087 * view depending on its state. 1088 * 1089 * @see android.graphics.drawable.Drawable 1090 * @see #getDrawableState() 1091 */ 1092 protected static final int[] EMPTY_STATE_SET; 1093 /** 1094 * Indicates the view is enabled. States are used with 1095 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1096 * view depending on its state. 1097 * 1098 * @see android.graphics.drawable.Drawable 1099 * @see #getDrawableState() 1100 */ 1101 protected static final int[] ENABLED_STATE_SET; 1102 /** 1103 * Indicates the view is focused. States are used with 1104 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1105 * view depending on its state. 1106 * 1107 * @see android.graphics.drawable.Drawable 1108 * @see #getDrawableState() 1109 */ 1110 protected static final int[] FOCUSED_STATE_SET; 1111 /** 1112 * Indicates the view is selected. States are used with 1113 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1114 * view depending on its state. 1115 * 1116 * @see android.graphics.drawable.Drawable 1117 * @see #getDrawableState() 1118 */ 1119 protected static final int[] SELECTED_STATE_SET; 1120 /** 1121 * Indicates the view is pressed. States are used with 1122 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1123 * view depending on its state. 1124 * 1125 * @see android.graphics.drawable.Drawable 1126 * @see #getDrawableState() 1127 * @hide 1128 */ 1129 protected static final int[] PRESSED_STATE_SET; 1130 /** 1131 * Indicates the view's window has focus. States are used with 1132 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1133 * view depending on its state. 1134 * 1135 * @see android.graphics.drawable.Drawable 1136 * @see #getDrawableState() 1137 */ 1138 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1139 // Doubles 1140 /** 1141 * Indicates the view is enabled and has the focus. 1142 * 1143 * @see #ENABLED_STATE_SET 1144 * @see #FOCUSED_STATE_SET 1145 */ 1146 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1147 /** 1148 * Indicates the view is enabled and selected. 1149 * 1150 * @see #ENABLED_STATE_SET 1151 * @see #SELECTED_STATE_SET 1152 */ 1153 protected static final int[] ENABLED_SELECTED_STATE_SET; 1154 /** 1155 * Indicates the view is enabled and that its window has focus. 1156 * 1157 * @see #ENABLED_STATE_SET 1158 * @see #WINDOW_FOCUSED_STATE_SET 1159 */ 1160 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1161 /** 1162 * Indicates the view is focused and selected. 1163 * 1164 * @see #FOCUSED_STATE_SET 1165 * @see #SELECTED_STATE_SET 1166 */ 1167 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1168 /** 1169 * Indicates the view has the focus and that its window has the focus. 1170 * 1171 * @see #FOCUSED_STATE_SET 1172 * @see #WINDOW_FOCUSED_STATE_SET 1173 */ 1174 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1175 /** 1176 * Indicates the view is selected and that its window has the focus. 1177 * 1178 * @see #SELECTED_STATE_SET 1179 * @see #WINDOW_FOCUSED_STATE_SET 1180 */ 1181 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1182 // Triples 1183 /** 1184 * Indicates the view is enabled, focused and selected. 1185 * 1186 * @see #ENABLED_STATE_SET 1187 * @see #FOCUSED_STATE_SET 1188 * @see #SELECTED_STATE_SET 1189 */ 1190 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1191 /** 1192 * Indicates the view is enabled, focused and its window has the focus. 1193 * 1194 * @see #ENABLED_STATE_SET 1195 * @see #FOCUSED_STATE_SET 1196 * @see #WINDOW_FOCUSED_STATE_SET 1197 */ 1198 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1199 /** 1200 * Indicates the view is enabled, selected and its window has the focus. 1201 * 1202 * @see #ENABLED_STATE_SET 1203 * @see #SELECTED_STATE_SET 1204 * @see #WINDOW_FOCUSED_STATE_SET 1205 */ 1206 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1207 /** 1208 * Indicates the view is focused, selected and its window has the focus. 1209 * 1210 * @see #FOCUSED_STATE_SET 1211 * @see #SELECTED_STATE_SET 1212 * @see #WINDOW_FOCUSED_STATE_SET 1213 */ 1214 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1215 /** 1216 * Indicates the view is enabled, focused, selected and its window 1217 * has the focus. 1218 * 1219 * @see #ENABLED_STATE_SET 1220 * @see #FOCUSED_STATE_SET 1221 * @see #SELECTED_STATE_SET 1222 * @see #WINDOW_FOCUSED_STATE_SET 1223 */ 1224 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1225 /** 1226 * Indicates the view is pressed and its window has the focus. 1227 * 1228 * @see #PRESSED_STATE_SET 1229 * @see #WINDOW_FOCUSED_STATE_SET 1230 */ 1231 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1232 /** 1233 * Indicates the view is pressed and selected. 1234 * 1235 * @see #PRESSED_STATE_SET 1236 * @see #SELECTED_STATE_SET 1237 */ 1238 protected static final int[] PRESSED_SELECTED_STATE_SET; 1239 /** 1240 * Indicates the view is pressed, selected and its window has the focus. 1241 * 1242 * @see #PRESSED_STATE_SET 1243 * @see #SELECTED_STATE_SET 1244 * @see #WINDOW_FOCUSED_STATE_SET 1245 */ 1246 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1247 /** 1248 * Indicates the view is pressed and focused. 1249 * 1250 * @see #PRESSED_STATE_SET 1251 * @see #FOCUSED_STATE_SET 1252 */ 1253 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1254 /** 1255 * Indicates the view is pressed, focused and its window has the focus. 1256 * 1257 * @see #PRESSED_STATE_SET 1258 * @see #FOCUSED_STATE_SET 1259 * @see #WINDOW_FOCUSED_STATE_SET 1260 */ 1261 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1262 /** 1263 * Indicates the view is pressed, focused and selected. 1264 * 1265 * @see #PRESSED_STATE_SET 1266 * @see #SELECTED_STATE_SET 1267 * @see #FOCUSED_STATE_SET 1268 */ 1269 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1270 /** 1271 * Indicates the view is pressed, focused, selected and its window has the focus. 1272 * 1273 * @see #PRESSED_STATE_SET 1274 * @see #FOCUSED_STATE_SET 1275 * @see #SELECTED_STATE_SET 1276 * @see #WINDOW_FOCUSED_STATE_SET 1277 */ 1278 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1279 /** 1280 * Indicates the view is pressed and enabled. 1281 * 1282 * @see #PRESSED_STATE_SET 1283 * @see #ENABLED_STATE_SET 1284 */ 1285 protected static final int[] PRESSED_ENABLED_STATE_SET; 1286 /** 1287 * Indicates the view is pressed, enabled and its window has the focus. 1288 * 1289 * @see #PRESSED_STATE_SET 1290 * @see #ENABLED_STATE_SET 1291 * @see #WINDOW_FOCUSED_STATE_SET 1292 */ 1293 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1294 /** 1295 * Indicates the view is pressed, enabled and selected. 1296 * 1297 * @see #PRESSED_STATE_SET 1298 * @see #ENABLED_STATE_SET 1299 * @see #SELECTED_STATE_SET 1300 */ 1301 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1302 /** 1303 * Indicates the view is pressed, enabled, selected and its window has the 1304 * focus. 1305 * 1306 * @see #PRESSED_STATE_SET 1307 * @see #ENABLED_STATE_SET 1308 * @see #SELECTED_STATE_SET 1309 * @see #WINDOW_FOCUSED_STATE_SET 1310 */ 1311 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1312 /** 1313 * Indicates the view is pressed, enabled and focused. 1314 * 1315 * @see #PRESSED_STATE_SET 1316 * @see #ENABLED_STATE_SET 1317 * @see #FOCUSED_STATE_SET 1318 */ 1319 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1320 /** 1321 * Indicates the view is pressed, enabled, focused and its window has the 1322 * focus. 1323 * 1324 * @see #PRESSED_STATE_SET 1325 * @see #ENABLED_STATE_SET 1326 * @see #FOCUSED_STATE_SET 1327 * @see #WINDOW_FOCUSED_STATE_SET 1328 */ 1329 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1330 /** 1331 * Indicates the view is pressed, enabled, focused and selected. 1332 * 1333 * @see #PRESSED_STATE_SET 1334 * @see #ENABLED_STATE_SET 1335 * @see #SELECTED_STATE_SET 1336 * @see #FOCUSED_STATE_SET 1337 */ 1338 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1339 /** 1340 * Indicates the view is pressed, enabled, focused, selected and its window 1341 * has the focus. 1342 * 1343 * @see #PRESSED_STATE_SET 1344 * @see #ENABLED_STATE_SET 1345 * @see #SELECTED_STATE_SET 1346 * @see #FOCUSED_STATE_SET 1347 * @see #WINDOW_FOCUSED_STATE_SET 1348 */ 1349 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1350 1351 /** 1352 * The order here is very important to {@link #getDrawableState()} 1353 */ 1354 private static final int[][] VIEW_STATE_SETS; 1355 1356 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1357 static final int VIEW_STATE_SELECTED = 1 << 1; 1358 static final int VIEW_STATE_FOCUSED = 1 << 2; 1359 static final int VIEW_STATE_ENABLED = 1 << 3; 1360 static final int VIEW_STATE_PRESSED = 1 << 4; 1361 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1362 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1363 static final int VIEW_STATE_HOVERED = 1 << 7; 1364 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1365 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1366 1367 static final int[] VIEW_STATE_IDS = new int[] { 1368 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1369 R.attr.state_selected, VIEW_STATE_SELECTED, 1370 R.attr.state_focused, VIEW_STATE_FOCUSED, 1371 R.attr.state_enabled, VIEW_STATE_ENABLED, 1372 R.attr.state_pressed, VIEW_STATE_PRESSED, 1373 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1374 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1375 R.attr.state_hovered, VIEW_STATE_HOVERED, 1376 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1377 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1378 }; 1379 1380 static { 1381 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1382 throw new IllegalStateException( 1383 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1384 } 1385 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1386 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1387 int viewState = R.styleable.ViewDrawableStates[i]; 1388 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1389 if (VIEW_STATE_IDS[j] == viewState) { 1390 orderedIds[i * 2] = viewState; 1391 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1392 } 1393 } 1394 } 1395 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1396 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1397 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1398 int numBits = Integer.bitCount(i); 1399 int[] set = new int[numBits]; 1400 int pos = 0; 1401 for (int j = 0; j < orderedIds.length; j += 2) { 1402 if ((i & orderedIds[j+1]) != 0) { 1403 set[pos++] = orderedIds[j]; 1404 } 1405 } 1406 VIEW_STATE_SETS[i] = set; 1407 } 1408 1409 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1410 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1411 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1412 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1413 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1414 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1415 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1417 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1418 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1419 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1420 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1421 | VIEW_STATE_FOCUSED]; 1422 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1423 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1424 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1425 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1426 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1427 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1428 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1429 | VIEW_STATE_ENABLED]; 1430 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1431 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1432 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1433 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1434 | VIEW_STATE_ENABLED]; 1435 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1436 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1437 | VIEW_STATE_ENABLED]; 1438 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1439 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1440 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1441 1442 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1443 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1445 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1447 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1448 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1449 | VIEW_STATE_PRESSED]; 1450 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1451 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1452 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1453 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1454 | VIEW_STATE_PRESSED]; 1455 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1456 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1457 | VIEW_STATE_PRESSED]; 1458 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1459 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1460 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1461 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1463 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1464 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1465 | VIEW_STATE_PRESSED]; 1466 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1467 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1468 | VIEW_STATE_PRESSED]; 1469 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1470 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1471 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1472 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1473 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1474 | VIEW_STATE_PRESSED]; 1475 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1476 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1477 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1478 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1479 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1480 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1481 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1482 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1483 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1484 | VIEW_STATE_PRESSED]; 1485 } 1486 1487 /** 1488 * Temporary Rect currently for use in setBackground(). This will probably 1489 * be extended in the future to hold our own class with more than just 1490 * a Rect. :) 1491 */ 1492 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1493 1494 /** 1495 * Map used to store views' tags. 1496 */ 1497 private static WeakHashMap<View, SparseArray<Object>> sTags; 1498 1499 /** 1500 * Lock used to access sTags. 1501 */ 1502 private static final Object sTagsLock = new Object(); 1503 1504 /** 1505 * The next available accessiiblity id. 1506 */ 1507 private static int sNextAccessibilityViewId; 1508 1509 /** 1510 * The animation currently associated with this view. 1511 * @hide 1512 */ 1513 protected Animation mCurrentAnimation = null; 1514 1515 /** 1516 * Width as measured during measure pass. 1517 * {@hide} 1518 */ 1519 @ViewDebug.ExportedProperty(category = "measurement") 1520 int mMeasuredWidth; 1521 1522 /** 1523 * Height as measured during measure pass. 1524 * {@hide} 1525 */ 1526 @ViewDebug.ExportedProperty(category = "measurement") 1527 int mMeasuredHeight; 1528 1529 /** 1530 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1531 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1532 * its display list. This flag, used only when hw accelerated, allows us to clear the 1533 * flag while retaining this information until it's needed (at getDisplayList() time and 1534 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1535 * 1536 * {@hide} 1537 */ 1538 boolean mRecreateDisplayList = false; 1539 1540 /** 1541 * The view's identifier. 1542 * {@hide} 1543 * 1544 * @see #setId(int) 1545 * @see #getId() 1546 */ 1547 @ViewDebug.ExportedProperty(resolveId = true) 1548 int mID = NO_ID; 1549 1550 /** 1551 * The stable ID of this view for accessibility porposes. 1552 */ 1553 int mAccessibilityViewId = NO_ID; 1554 1555 /** 1556 * The view's tag. 1557 * {@hide} 1558 * 1559 * @see #setTag(Object) 1560 * @see #getTag() 1561 */ 1562 protected Object mTag; 1563 1564 // for mPrivateFlags: 1565 /** {@hide} */ 1566 static final int WANTS_FOCUS = 0x00000001; 1567 /** {@hide} */ 1568 static final int FOCUSED = 0x00000002; 1569 /** {@hide} */ 1570 static final int SELECTED = 0x00000004; 1571 /** {@hide} */ 1572 static final int IS_ROOT_NAMESPACE = 0x00000008; 1573 /** {@hide} */ 1574 static final int HAS_BOUNDS = 0x00000010; 1575 /** {@hide} */ 1576 static final int DRAWN = 0x00000020; 1577 /** 1578 * When this flag is set, this view is running an animation on behalf of its 1579 * children and should therefore not cancel invalidate requests, even if they 1580 * lie outside of this view's bounds. 1581 * 1582 * {@hide} 1583 */ 1584 static final int DRAW_ANIMATION = 0x00000040; 1585 /** {@hide} */ 1586 static final int SKIP_DRAW = 0x00000080; 1587 /** {@hide} */ 1588 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1589 /** {@hide} */ 1590 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1591 /** {@hide} */ 1592 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1593 /** {@hide} */ 1594 static final int MEASURED_DIMENSION_SET = 0x00000800; 1595 /** {@hide} */ 1596 static final int FORCE_LAYOUT = 0x00001000; 1597 /** {@hide} */ 1598 static final int LAYOUT_REQUIRED = 0x00002000; 1599 1600 private static final int PRESSED = 0x00004000; 1601 1602 /** {@hide} */ 1603 static final int DRAWING_CACHE_VALID = 0x00008000; 1604 /** 1605 * Flag used to indicate that this view should be drawn once more (and only once 1606 * more) after its animation has completed. 1607 * {@hide} 1608 */ 1609 static final int ANIMATION_STARTED = 0x00010000; 1610 1611 private static final int SAVE_STATE_CALLED = 0x00020000; 1612 1613 /** 1614 * Indicates that the View returned true when onSetAlpha() was called and that 1615 * the alpha must be restored. 1616 * {@hide} 1617 */ 1618 static final int ALPHA_SET = 0x00040000; 1619 1620 /** 1621 * Set by {@link #setScrollContainer(boolean)}. 1622 */ 1623 static final int SCROLL_CONTAINER = 0x00080000; 1624 1625 /** 1626 * Set by {@link #setScrollContainer(boolean)}. 1627 */ 1628 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1629 1630 /** 1631 * View flag indicating whether this view was invalidated (fully or partially.) 1632 * 1633 * @hide 1634 */ 1635 static final int DIRTY = 0x00200000; 1636 1637 /** 1638 * View flag indicating whether this view was invalidated by an opaque 1639 * invalidate request. 1640 * 1641 * @hide 1642 */ 1643 static final int DIRTY_OPAQUE = 0x00400000; 1644 1645 /** 1646 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1647 * 1648 * @hide 1649 */ 1650 static final int DIRTY_MASK = 0x00600000; 1651 1652 /** 1653 * Indicates whether the background is opaque. 1654 * 1655 * @hide 1656 */ 1657 static final int OPAQUE_BACKGROUND = 0x00800000; 1658 1659 /** 1660 * Indicates whether the scrollbars are opaque. 1661 * 1662 * @hide 1663 */ 1664 static final int OPAQUE_SCROLLBARS = 0x01000000; 1665 1666 /** 1667 * Indicates whether the view is opaque. 1668 * 1669 * @hide 1670 */ 1671 static final int OPAQUE_MASK = 0x01800000; 1672 1673 /** 1674 * Indicates a prepressed state; 1675 * the short time between ACTION_DOWN and recognizing 1676 * a 'real' press. Prepressed is used to recognize quick taps 1677 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1678 * 1679 * @hide 1680 */ 1681 private static final int PREPRESSED = 0x02000000; 1682 1683 /** 1684 * Indicates whether the view is temporarily detached. 1685 * 1686 * @hide 1687 */ 1688 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1689 1690 /** 1691 * Indicates that we should awaken scroll bars once attached 1692 * 1693 * @hide 1694 */ 1695 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1696 1697 /** 1698 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1699 * @hide 1700 */ 1701 private static final int HOVERED = 0x10000000; 1702 1703 /** 1704 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1705 * for transform operations 1706 * 1707 * @hide 1708 */ 1709 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1710 1711 /** {@hide} */ 1712 static final int ACTIVATED = 0x40000000; 1713 1714 /** 1715 * Indicates that this view was specifically invalidated, not just dirtied because some 1716 * child view was invalidated. The flag is used to determine when we need to recreate 1717 * a view's display list (as opposed to just returning a reference to its existing 1718 * display list). 1719 * 1720 * @hide 1721 */ 1722 static final int INVALIDATED = 0x80000000; 1723 1724 /* Masks for mPrivateFlags2 */ 1725 1726 /** 1727 * Indicates that this view has reported that it can accept the current drag's content. 1728 * Cleared when the drag operation concludes. 1729 * @hide 1730 */ 1731 static final int DRAG_CAN_ACCEPT = 0x00000001; 1732 1733 /** 1734 * Indicates that this view is currently directly under the drag location in a 1735 * drag-and-drop operation involving content that it can accept. Cleared when 1736 * the drag exits the view, or when the drag operation concludes. 1737 * @hide 1738 */ 1739 static final int DRAG_HOVERED = 0x00000002; 1740 1741 /** 1742 * Indicates whether the view layout direction has been resolved and drawn to the 1743 * right-to-left direction. 1744 * 1745 * @hide 1746 */ 1747 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 0x00000004; 1748 1749 /** 1750 * Indicates whether the view layout direction has been resolved. 1751 * 1752 * @hide 1753 */ 1754 static final int LAYOUT_DIRECTION_RESOLVED = 0x00000008; 1755 1756 1757 /* End of masks for mPrivateFlags2 */ 1758 1759 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1760 1761 /** 1762 * Always allow a user to over-scroll this view, provided it is a 1763 * view that can scroll. 1764 * 1765 * @see #getOverScrollMode() 1766 * @see #setOverScrollMode(int) 1767 */ 1768 public static final int OVER_SCROLL_ALWAYS = 0; 1769 1770 /** 1771 * Allow a user to over-scroll this view only if the content is large 1772 * enough to meaningfully scroll, provided it is a view that can scroll. 1773 * 1774 * @see #getOverScrollMode() 1775 * @see #setOverScrollMode(int) 1776 */ 1777 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1778 1779 /** 1780 * Never allow a user to over-scroll this view. 1781 * 1782 * @see #getOverScrollMode() 1783 * @see #setOverScrollMode(int) 1784 */ 1785 public static final int OVER_SCROLL_NEVER = 2; 1786 1787 /** 1788 * View has requested the system UI (status bar) to be visible (the default). 1789 * 1790 * @see #setSystemUiVisibility(int) 1791 */ 1792 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 1793 1794 /** 1795 * View has requested the system UI to enter an unobtrusive "low profile" mode. 1796 * 1797 * This is for use in games, book readers, video players, or any other "immersive" application 1798 * where the usual system chrome is deemed too distracting. 1799 * 1800 * In low profile mode, the status bar and/or navigation icons may dim. 1801 * 1802 * @see #setSystemUiVisibility(int) 1803 */ 1804 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 1805 1806 /** 1807 * View has requested that the system navigation be temporarily hidden. 1808 * 1809 * This is an even less obtrusive state than that called for by 1810 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 1811 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 1812 * those to disappear. This is useful (in conjunction with the 1813 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 1814 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 1815 * window flags) for displaying content using every last pixel on the display. 1816 * 1817 * There is a limitation: because navigation controls are so important, the least user 1818 * interaction will cause them to reappear immediately. 1819 * 1820 * @see #setSystemUiVisibility(int) 1821 */ 1822 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 1823 1824 /** 1825 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 1826 */ 1827 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 1828 1829 /** 1830 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 1831 */ 1832 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 1833 1834 /** 1835 * @hide 1836 * 1837 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1838 * out of the public fields to keep the undefined bits out of the developer's way. 1839 * 1840 * Flag to make the status bar not expandable. Unless you also 1841 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1842 */ 1843 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1844 1845 /** 1846 * @hide 1847 * 1848 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1849 * out of the public fields to keep the undefined bits out of the developer's way. 1850 * 1851 * Flag to hide notification icons and scrolling ticker text. 1852 */ 1853 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1854 1855 /** 1856 * @hide 1857 * 1858 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1859 * out of the public fields to keep the undefined bits out of the developer's way. 1860 * 1861 * Flag to disable incoming notification alerts. This will not block 1862 * icons, but it will block sound, vibrating and other visual or aural notifications. 1863 */ 1864 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1865 1866 /** 1867 * @hide 1868 * 1869 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1870 * out of the public fields to keep the undefined bits out of the developer's way. 1871 * 1872 * Flag to hide only the scrolling ticker. Note that 1873 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1874 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1875 */ 1876 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1877 1878 /** 1879 * @hide 1880 * 1881 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1882 * out of the public fields to keep the undefined bits out of the developer's way. 1883 * 1884 * Flag to hide the center system info area. 1885 */ 1886 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1887 1888 /** 1889 * @hide 1890 * 1891 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1892 * out of the public fields to keep the undefined bits out of the developer's way. 1893 * 1894 * Flag to hide only the navigation buttons. Don't use this 1895 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1896 * 1897 * THIS DOES NOT DISABLE THE BACK BUTTON 1898 */ 1899 public static final int STATUS_BAR_DISABLE_NAVIGATION = 0x00200000; 1900 1901 /** 1902 * @hide 1903 * 1904 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1905 * out of the public fields to keep the undefined bits out of the developer's way. 1906 * 1907 * Flag to hide only the back button. Don't use this 1908 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1909 */ 1910 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1911 1912 /** 1913 * @hide 1914 * 1915 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1916 * out of the public fields to keep the undefined bits out of the developer's way. 1917 * 1918 * Flag to hide only the clock. You might use this if your activity has 1919 * its own clock making the status bar's clock redundant. 1920 */ 1921 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1922 1923 /** 1924 * @hide 1925 */ 1926 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 1927 1928 /** 1929 * Controls the over-scroll mode for this view. 1930 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1931 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1932 * and {@link #OVER_SCROLL_NEVER}. 1933 */ 1934 private int mOverScrollMode; 1935 1936 /** 1937 * The parent this view is attached to. 1938 * {@hide} 1939 * 1940 * @see #getParent() 1941 */ 1942 protected ViewParent mParent; 1943 1944 /** 1945 * {@hide} 1946 */ 1947 AttachInfo mAttachInfo; 1948 1949 /** 1950 * {@hide} 1951 */ 1952 @ViewDebug.ExportedProperty(flagMapping = { 1953 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1954 name = "FORCE_LAYOUT"), 1955 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1956 name = "LAYOUT_REQUIRED"), 1957 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1958 name = "DRAWING_CACHE_INVALID", outputIf = false), 1959 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1960 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1961 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1962 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1963 }) 1964 int mPrivateFlags; 1965 int mPrivateFlags2; 1966 1967 /** 1968 * This view's request for the visibility of the status bar. 1969 * @hide 1970 */ 1971 @ViewDebug.ExportedProperty(flagMapping = { 1972 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 1973 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 1974 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 1975 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 1976 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 1977 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 1978 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 1979 equals = SYSTEM_UI_FLAG_VISIBLE, 1980 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 1981 }) 1982 int mSystemUiVisibility; 1983 1984 /** 1985 * Count of how many windows this view has been attached to. 1986 */ 1987 int mWindowAttachCount; 1988 1989 /** 1990 * The layout parameters associated with this view and used by the parent 1991 * {@link android.view.ViewGroup} to determine how this view should be 1992 * laid out. 1993 * {@hide} 1994 */ 1995 protected ViewGroup.LayoutParams mLayoutParams; 1996 1997 /** 1998 * The view flags hold various views states. 1999 * {@hide} 2000 */ 2001 @ViewDebug.ExportedProperty 2002 int mViewFlags; 2003 2004 /** 2005 * The transform matrix for the View. This transform is calculated internally 2006 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2007 * is used by default. Do *not* use this variable directly; instead call 2008 * getMatrix(), which will automatically recalculate the matrix if necessary 2009 * to get the correct matrix based on the latest rotation and scale properties. 2010 */ 2011 private final Matrix mMatrix = new Matrix(); 2012 2013 /** 2014 * The transform matrix for the View. This transform is calculated internally 2015 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2016 * is used by default. Do *not* use this variable directly; instead call 2017 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2018 * to get the correct matrix based on the latest rotation and scale properties. 2019 */ 2020 private Matrix mInverseMatrix; 2021 2022 /** 2023 * An internal variable that tracks whether we need to recalculate the 2024 * transform matrix, based on whether the rotation or scaleX/Y properties 2025 * have changed since the matrix was last calculated. 2026 */ 2027 boolean mMatrixDirty = false; 2028 2029 /** 2030 * An internal variable that tracks whether we need to recalculate the 2031 * transform matrix, based on whether the rotation or scaleX/Y properties 2032 * have changed since the matrix was last calculated. 2033 */ 2034 private boolean mInverseMatrixDirty = true; 2035 2036 /** 2037 * A variable that tracks whether we need to recalculate the 2038 * transform matrix, based on whether the rotation or scaleX/Y properties 2039 * have changed since the matrix was last calculated. This variable 2040 * is only valid after a call to updateMatrix() or to a function that 2041 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2042 */ 2043 private boolean mMatrixIsIdentity = true; 2044 2045 /** 2046 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2047 */ 2048 private Camera mCamera = null; 2049 2050 /** 2051 * This matrix is used when computing the matrix for 3D rotations. 2052 */ 2053 private Matrix matrix3D = null; 2054 2055 /** 2056 * These prev values are used to recalculate a centered pivot point when necessary. The 2057 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2058 * set), so thes values are only used then as well. 2059 */ 2060 private int mPrevWidth = -1; 2061 private int mPrevHeight = -1; 2062 2063 private boolean mLastIsOpaque; 2064 2065 /** 2066 * Convenience value to check for float values that are close enough to zero to be considered 2067 * zero. 2068 */ 2069 private static final float NONZERO_EPSILON = .001f; 2070 2071 /** 2072 * The degrees rotation around the vertical axis through the pivot point. 2073 */ 2074 @ViewDebug.ExportedProperty 2075 float mRotationY = 0f; 2076 2077 /** 2078 * The degrees rotation around the horizontal axis through the pivot point. 2079 */ 2080 @ViewDebug.ExportedProperty 2081 float mRotationX = 0f; 2082 2083 /** 2084 * The degrees rotation around the pivot point. 2085 */ 2086 @ViewDebug.ExportedProperty 2087 float mRotation = 0f; 2088 2089 /** 2090 * The amount of translation of the object away from its left property (post-layout). 2091 */ 2092 @ViewDebug.ExportedProperty 2093 float mTranslationX = 0f; 2094 2095 /** 2096 * The amount of translation of the object away from its top property (post-layout). 2097 */ 2098 @ViewDebug.ExportedProperty 2099 float mTranslationY = 0f; 2100 2101 /** 2102 * The amount of scale in the x direction around the pivot point. A 2103 * value of 1 means no scaling is applied. 2104 */ 2105 @ViewDebug.ExportedProperty 2106 float mScaleX = 1f; 2107 2108 /** 2109 * The amount of scale in the y direction around the pivot point. A 2110 * value of 1 means no scaling is applied. 2111 */ 2112 @ViewDebug.ExportedProperty 2113 float mScaleY = 1f; 2114 2115 /** 2116 * The amount of scale in the x direction around the pivot point. A 2117 * value of 1 means no scaling is applied. 2118 */ 2119 @ViewDebug.ExportedProperty 2120 float mPivotX = 0f; 2121 2122 /** 2123 * The amount of scale in the y direction around the pivot point. A 2124 * value of 1 means no scaling is applied. 2125 */ 2126 @ViewDebug.ExportedProperty 2127 float mPivotY = 0f; 2128 2129 /** 2130 * The opacity of the View. This is a value from 0 to 1, where 0 means 2131 * completely transparent and 1 means completely opaque. 2132 */ 2133 @ViewDebug.ExportedProperty 2134 float mAlpha = 1f; 2135 2136 /** 2137 * The distance in pixels from the left edge of this view's parent 2138 * to the left edge of this view. 2139 * {@hide} 2140 */ 2141 @ViewDebug.ExportedProperty(category = "layout") 2142 protected int mLeft; 2143 /** 2144 * The distance in pixels from the left edge of this view's parent 2145 * to the right edge of this view. 2146 * {@hide} 2147 */ 2148 @ViewDebug.ExportedProperty(category = "layout") 2149 protected int mRight; 2150 /** 2151 * The distance in pixels from the top edge of this view's parent 2152 * to the top edge of this view. 2153 * {@hide} 2154 */ 2155 @ViewDebug.ExportedProperty(category = "layout") 2156 protected int mTop; 2157 /** 2158 * The distance in pixels from the top edge of this view's parent 2159 * to the bottom edge of this view. 2160 * {@hide} 2161 */ 2162 @ViewDebug.ExportedProperty(category = "layout") 2163 protected int mBottom; 2164 2165 /** 2166 * The offset, in pixels, by which the content of this view is scrolled 2167 * horizontally. 2168 * {@hide} 2169 */ 2170 @ViewDebug.ExportedProperty(category = "scrolling") 2171 protected int mScrollX; 2172 /** 2173 * The offset, in pixels, by which the content of this view is scrolled 2174 * vertically. 2175 * {@hide} 2176 */ 2177 @ViewDebug.ExportedProperty(category = "scrolling") 2178 protected int mScrollY; 2179 2180 /** 2181 * The left padding in pixels, that is the distance in pixels between the 2182 * left edge of this view and the left edge of its content. 2183 * {@hide} 2184 */ 2185 @ViewDebug.ExportedProperty(category = "padding") 2186 protected int mPaddingLeft; 2187 /** 2188 * The right padding in pixels, that is the distance in pixels between the 2189 * right edge of this view and the right edge of its content. 2190 * {@hide} 2191 */ 2192 @ViewDebug.ExportedProperty(category = "padding") 2193 protected int mPaddingRight; 2194 /** 2195 * The top padding in pixels, that is the distance in pixels between the 2196 * top edge of this view and the top edge of its content. 2197 * {@hide} 2198 */ 2199 @ViewDebug.ExportedProperty(category = "padding") 2200 protected int mPaddingTop; 2201 /** 2202 * The bottom padding in pixels, that is the distance in pixels between the 2203 * bottom edge of this view and the bottom edge of its content. 2204 * {@hide} 2205 */ 2206 @ViewDebug.ExportedProperty(category = "padding") 2207 protected int mPaddingBottom; 2208 2209 /** 2210 * Briefly describes the view and is primarily used for accessibility support. 2211 */ 2212 private CharSequence mContentDescription; 2213 2214 /** 2215 * Cache the paddingRight set by the user to append to the scrollbar's size. 2216 * 2217 * @hide 2218 */ 2219 @ViewDebug.ExportedProperty(category = "padding") 2220 protected int mUserPaddingRight; 2221 2222 /** 2223 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2224 * 2225 * @hide 2226 */ 2227 @ViewDebug.ExportedProperty(category = "padding") 2228 protected int mUserPaddingBottom; 2229 2230 /** 2231 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2232 * 2233 * @hide 2234 */ 2235 @ViewDebug.ExportedProperty(category = "padding") 2236 protected int mUserPaddingLeft; 2237 2238 /** 2239 * Cache if the user padding is relative. 2240 * 2241 */ 2242 @ViewDebug.ExportedProperty(category = "padding") 2243 boolean mUserPaddingRelative; 2244 2245 /** 2246 * Cache the paddingStart set by the user to append to the scrollbar's size. 2247 * 2248 */ 2249 @ViewDebug.ExportedProperty(category = "padding") 2250 int mUserPaddingStart; 2251 2252 /** 2253 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2254 * 2255 */ 2256 @ViewDebug.ExportedProperty(category = "padding") 2257 int mUserPaddingEnd; 2258 2259 /** 2260 * @hide 2261 */ 2262 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2263 /** 2264 * @hide 2265 */ 2266 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2267 2268 private Resources mResources = null; 2269 2270 private Drawable mBGDrawable; 2271 2272 private int mBackgroundResource; 2273 private boolean mBackgroundSizeChanged; 2274 2275 /** 2276 * Listener used to dispatch focus change events. 2277 * This field should be made private, so it is hidden from the SDK. 2278 * {@hide} 2279 */ 2280 protected OnFocusChangeListener mOnFocusChangeListener; 2281 2282 /** 2283 * Listeners for layout change events. 2284 */ 2285 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2286 2287 /** 2288 * Listeners for attach events. 2289 */ 2290 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2291 2292 /** 2293 * Listener used to dispatch click events. 2294 * This field should be made private, so it is hidden from the SDK. 2295 * {@hide} 2296 */ 2297 protected OnClickListener mOnClickListener; 2298 2299 /** 2300 * Listener used to dispatch long click events. 2301 * This field should be made private, so it is hidden from the SDK. 2302 * {@hide} 2303 */ 2304 protected OnLongClickListener mOnLongClickListener; 2305 2306 /** 2307 * Listener used to build the context menu. 2308 * This field should be made private, so it is hidden from the SDK. 2309 * {@hide} 2310 */ 2311 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2312 2313 private OnKeyListener mOnKeyListener; 2314 2315 private OnTouchListener mOnTouchListener; 2316 2317 private OnHoverListener mOnHoverListener; 2318 2319 private OnGenericMotionListener mOnGenericMotionListener; 2320 2321 private OnDragListener mOnDragListener; 2322 2323 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2324 2325 /** 2326 * The application environment this view lives in. 2327 * This field should be made private, so it is hidden from the SDK. 2328 * {@hide} 2329 */ 2330 protected Context mContext; 2331 2332 private ScrollabilityCache mScrollCache; 2333 2334 private int[] mDrawableState = null; 2335 2336 /** 2337 * Set to true when drawing cache is enabled and cannot be created. 2338 * 2339 * @hide 2340 */ 2341 public boolean mCachingFailed; 2342 2343 private Bitmap mDrawingCache; 2344 private Bitmap mUnscaledDrawingCache; 2345 private HardwareLayer mHardwareLayer; 2346 DisplayList mDisplayList; 2347 2348 /** 2349 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2350 * the user may specify which view to go to next. 2351 */ 2352 private int mNextFocusLeftId = View.NO_ID; 2353 2354 /** 2355 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2356 * the user may specify which view to go to next. 2357 */ 2358 private int mNextFocusRightId = View.NO_ID; 2359 2360 /** 2361 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2362 * the user may specify which view to go to next. 2363 */ 2364 private int mNextFocusUpId = View.NO_ID; 2365 2366 /** 2367 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2368 * the user may specify which view to go to next. 2369 */ 2370 private int mNextFocusDownId = View.NO_ID; 2371 2372 /** 2373 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2374 * the user may specify which view to go to next. 2375 */ 2376 int mNextFocusForwardId = View.NO_ID; 2377 2378 private CheckForLongPress mPendingCheckForLongPress; 2379 private CheckForTap mPendingCheckForTap = null; 2380 private PerformClick mPerformClick; 2381 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2382 2383 private UnsetPressedState mUnsetPressedState; 2384 2385 /** 2386 * Whether the long press's action has been invoked. The tap's action is invoked on the 2387 * up event while a long press is invoked as soon as the long press duration is reached, so 2388 * a long press could be performed before the tap is checked, in which case the tap's action 2389 * should not be invoked. 2390 */ 2391 private boolean mHasPerformedLongPress; 2392 2393 /** 2394 * The minimum height of the view. We'll try our best to have the height 2395 * of this view to at least this amount. 2396 */ 2397 @ViewDebug.ExportedProperty(category = "measurement") 2398 private int mMinHeight; 2399 2400 /** 2401 * The minimum width of the view. We'll try our best to have the width 2402 * of this view to at least this amount. 2403 */ 2404 @ViewDebug.ExportedProperty(category = "measurement") 2405 private int mMinWidth; 2406 2407 /** 2408 * The delegate to handle touch events that are physically in this view 2409 * but should be handled by another view. 2410 */ 2411 private TouchDelegate mTouchDelegate = null; 2412 2413 /** 2414 * Solid color to use as a background when creating the drawing cache. Enables 2415 * the cache to use 16 bit bitmaps instead of 32 bit. 2416 */ 2417 private int mDrawingCacheBackgroundColor = 0; 2418 2419 /** 2420 * Special tree observer used when mAttachInfo is null. 2421 */ 2422 private ViewTreeObserver mFloatingTreeObserver; 2423 2424 /** 2425 * Cache the touch slop from the context that created the view. 2426 */ 2427 private int mTouchSlop; 2428 2429 /** 2430 * Object that handles automatic animation of view properties. 2431 */ 2432 private ViewPropertyAnimator mAnimator = null; 2433 2434 /** 2435 * Flag indicating that a drag can cross window boundaries. When 2436 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2437 * with this flag set, all visible applications will be able to participate 2438 * in the drag operation and receive the dragged content. 2439 * 2440 * @hide 2441 */ 2442 public static final int DRAG_FLAG_GLOBAL = 1; 2443 2444 /** 2445 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2446 */ 2447 private float mVerticalScrollFactor; 2448 2449 /** 2450 * Position of the vertical scroll bar. 2451 */ 2452 private int mVerticalScrollbarPosition; 2453 2454 /** 2455 * Position the scroll bar at the default position as determined by the system. 2456 */ 2457 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2458 2459 /** 2460 * Position the scroll bar along the left edge. 2461 */ 2462 public static final int SCROLLBAR_POSITION_LEFT = 1; 2463 2464 /** 2465 * Position the scroll bar along the right edge. 2466 */ 2467 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2468 2469 /** 2470 * Indicates that the view does not have a layer. 2471 * 2472 * @see #getLayerType() 2473 * @see #setLayerType(int, android.graphics.Paint) 2474 * @see #LAYER_TYPE_SOFTWARE 2475 * @see #LAYER_TYPE_HARDWARE 2476 */ 2477 public static final int LAYER_TYPE_NONE = 0; 2478 2479 /** 2480 * <p>Indicates that the view has a software layer. A software layer is backed 2481 * by a bitmap and causes the view to be rendered using Android's software 2482 * rendering pipeline, even if hardware acceleration is enabled.</p> 2483 * 2484 * <p>Software layers have various usages:</p> 2485 * <p>When the application is not using hardware acceleration, a software layer 2486 * is useful to apply a specific color filter and/or blending mode and/or 2487 * translucency to a view and all its children.</p> 2488 * <p>When the application is using hardware acceleration, a software layer 2489 * is useful to render drawing primitives not supported by the hardware 2490 * accelerated pipeline. It can also be used to cache a complex view tree 2491 * into a texture and reduce the complexity of drawing operations. For instance, 2492 * when animating a complex view tree with a translation, a software layer can 2493 * be used to render the view tree only once.</p> 2494 * <p>Software layers should be avoided when the affected view tree updates 2495 * often. Every update will require to re-render the software layer, which can 2496 * potentially be slow (particularly when hardware acceleration is turned on 2497 * since the layer will have to be uploaded into a hardware texture after every 2498 * update.)</p> 2499 * 2500 * @see #getLayerType() 2501 * @see #setLayerType(int, android.graphics.Paint) 2502 * @see #LAYER_TYPE_NONE 2503 * @see #LAYER_TYPE_HARDWARE 2504 */ 2505 public static final int LAYER_TYPE_SOFTWARE = 1; 2506 2507 /** 2508 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2509 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2510 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2511 * rendering pipeline, but only if hardware acceleration is turned on for the 2512 * view hierarchy. When hardware acceleration is turned off, hardware layers 2513 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2514 * 2515 * <p>A hardware layer is useful to apply a specific color filter and/or 2516 * blending mode and/or translucency to a view and all its children.</p> 2517 * <p>A hardware layer can be used to cache a complex view tree into a 2518 * texture and reduce the complexity of drawing operations. For instance, 2519 * when animating a complex view tree with a translation, a hardware layer can 2520 * be used to render the view tree only once.</p> 2521 * <p>A hardware layer can also be used to increase the rendering quality when 2522 * rotation transformations are applied on a view. It can also be used to 2523 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2524 * 2525 * @see #getLayerType() 2526 * @see #setLayerType(int, android.graphics.Paint) 2527 * @see #LAYER_TYPE_NONE 2528 * @see #LAYER_TYPE_SOFTWARE 2529 */ 2530 public static final int LAYER_TYPE_HARDWARE = 2; 2531 2532 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2533 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2534 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2535 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2536 }) 2537 int mLayerType = LAYER_TYPE_NONE; 2538 Paint mLayerPaint; 2539 Rect mLocalDirtyRect; 2540 2541 /** 2542 * Set to true when the view is sending hover accessibility events because it 2543 * is the innermost hovered view. 2544 */ 2545 private boolean mSendingHoverAccessibilityEvents; 2546 2547 /** 2548 * Text direction is inherited thru {@link ViewGroup} 2549 * @hide 2550 */ 2551 public static final int TEXT_DIRECTION_INHERIT = 0; 2552 2553 /** 2554 * Text direction is using "first strong algorithm". The first strong directional character 2555 * determines the paragraph direction. If there is no strong directional character, the 2556 * paragraph direction is the view's resolved ayout direction. 2557 * 2558 * @hide 2559 */ 2560 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 2561 2562 /** 2563 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 2564 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 2565 * If there are neither, the paragraph direction is the view's resolved layout direction. 2566 * 2567 * @hide 2568 */ 2569 public static final int TEXT_DIRECTION_ANY_RTL = 2; 2570 2571 /** 2572 * Text direction is forced to LTR. 2573 * 2574 * @hide 2575 */ 2576 public static final int TEXT_DIRECTION_LTR = 3; 2577 2578 /** 2579 * Text direction is forced to RTL. 2580 * 2581 * @hide 2582 */ 2583 public static final int TEXT_DIRECTION_RTL = 4; 2584 2585 /** 2586 * Default text direction is inherited 2587 * 2588 * @hide 2589 */ 2590 protected static int DEFAULT_TEXT_DIRECTION = TEXT_DIRECTION_INHERIT; 2591 2592 /** 2593 * The text direction that has been defined by {@link #setTextDirection(int)}. 2594 * 2595 * {@hide} 2596 */ 2597 @ViewDebug.ExportedProperty(category = "text", mapping = { 2598 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2599 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2600 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2601 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2602 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL") 2603 }) 2604 private int mTextDirection = DEFAULT_TEXT_DIRECTION; 2605 2606 /** 2607 * The resolved text direction. This needs resolution if the value is 2608 * TEXT_DIRECTION_INHERIT. The resolution matches mTextDirection if that is 2609 * not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds up the parent 2610 * chain of the view. 2611 * 2612 * {@hide} 2613 */ 2614 @ViewDebug.ExportedProperty(category = "text", mapping = { 2615 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2616 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2617 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2618 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2619 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL") 2620 }) 2621 private int mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 2622 2623 /** 2624 * Consistency verifier for debugging purposes. 2625 * @hide 2626 */ 2627 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2628 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2629 new InputEventConsistencyVerifier(this, 0) : null; 2630 2631 /** 2632 * Simple constructor to use when creating a view from code. 2633 * 2634 * @param context The Context the view is running in, through which it can 2635 * access the current theme, resources, etc. 2636 */ 2637 public View(Context context) { 2638 mContext = context; 2639 mResources = context != null ? context.getResources() : null; 2640 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT; 2641 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2642 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2643 mUserPaddingStart = -1; 2644 mUserPaddingEnd = -1; 2645 mUserPaddingRelative = false; 2646 } 2647 2648 /** 2649 * Constructor that is called when inflating a view from XML. This is called 2650 * when a view is being constructed from an XML file, supplying attributes 2651 * that were specified in the XML file. This version uses a default style of 2652 * 0, so the only attribute values applied are those in the Context's Theme 2653 * and the given AttributeSet. 2654 * 2655 * <p> 2656 * The method onFinishInflate() will be called after all children have been 2657 * added. 2658 * 2659 * @param context The Context the view is running in, through which it can 2660 * access the current theme, resources, etc. 2661 * @param attrs The attributes of the XML tag that is inflating the view. 2662 * @see #View(Context, AttributeSet, int) 2663 */ 2664 public View(Context context, AttributeSet attrs) { 2665 this(context, attrs, 0); 2666 } 2667 2668 /** 2669 * Perform inflation from XML and apply a class-specific base style. This 2670 * constructor of View allows subclasses to use their own base style when 2671 * they are inflating. For example, a Button class's constructor would call 2672 * this version of the super class constructor and supply 2673 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2674 * the theme's button style to modify all of the base view attributes (in 2675 * particular its background) as well as the Button class's attributes. 2676 * 2677 * @param context The Context the view is running in, through which it can 2678 * access the current theme, resources, etc. 2679 * @param attrs The attributes of the XML tag that is inflating the view. 2680 * @param defStyle The default style to apply to this view. If 0, no style 2681 * will be applied (beyond what is included in the theme). This may 2682 * either be an attribute resource, whose value will be retrieved 2683 * from the current theme, or an explicit style resource. 2684 * @see #View(Context, AttributeSet) 2685 */ 2686 public View(Context context, AttributeSet attrs, int defStyle) { 2687 this(context); 2688 2689 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2690 defStyle, 0); 2691 2692 Drawable background = null; 2693 2694 int leftPadding = -1; 2695 int topPadding = -1; 2696 int rightPadding = -1; 2697 int bottomPadding = -1; 2698 int startPadding = -1; 2699 int endPadding = -1; 2700 2701 int padding = -1; 2702 2703 int viewFlagValues = 0; 2704 int viewFlagMasks = 0; 2705 2706 boolean setScrollContainer = false; 2707 2708 int x = 0; 2709 int y = 0; 2710 2711 float tx = 0; 2712 float ty = 0; 2713 float rotation = 0; 2714 float rotationX = 0; 2715 float rotationY = 0; 2716 float sx = 1f; 2717 float sy = 1f; 2718 boolean transformSet = false; 2719 2720 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2721 2722 int overScrollMode = mOverScrollMode; 2723 final int N = a.getIndexCount(); 2724 for (int i = 0; i < N; i++) { 2725 int attr = a.getIndex(i); 2726 switch (attr) { 2727 case com.android.internal.R.styleable.View_background: 2728 background = a.getDrawable(attr); 2729 break; 2730 case com.android.internal.R.styleable.View_padding: 2731 padding = a.getDimensionPixelSize(attr, -1); 2732 break; 2733 case com.android.internal.R.styleable.View_paddingLeft: 2734 leftPadding = a.getDimensionPixelSize(attr, -1); 2735 break; 2736 case com.android.internal.R.styleable.View_paddingTop: 2737 topPadding = a.getDimensionPixelSize(attr, -1); 2738 break; 2739 case com.android.internal.R.styleable.View_paddingRight: 2740 rightPadding = a.getDimensionPixelSize(attr, -1); 2741 break; 2742 case com.android.internal.R.styleable.View_paddingBottom: 2743 bottomPadding = a.getDimensionPixelSize(attr, -1); 2744 break; 2745 case com.android.internal.R.styleable.View_paddingStart: 2746 startPadding = a.getDimensionPixelSize(attr, -1); 2747 break; 2748 case com.android.internal.R.styleable.View_paddingEnd: 2749 endPadding = a.getDimensionPixelSize(attr, -1); 2750 break; 2751 case com.android.internal.R.styleable.View_scrollX: 2752 x = a.getDimensionPixelOffset(attr, 0); 2753 break; 2754 case com.android.internal.R.styleable.View_scrollY: 2755 y = a.getDimensionPixelOffset(attr, 0); 2756 break; 2757 case com.android.internal.R.styleable.View_alpha: 2758 setAlpha(a.getFloat(attr, 1f)); 2759 break; 2760 case com.android.internal.R.styleable.View_transformPivotX: 2761 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2762 break; 2763 case com.android.internal.R.styleable.View_transformPivotY: 2764 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2765 break; 2766 case com.android.internal.R.styleable.View_translationX: 2767 tx = a.getDimensionPixelOffset(attr, 0); 2768 transformSet = true; 2769 break; 2770 case com.android.internal.R.styleable.View_translationY: 2771 ty = a.getDimensionPixelOffset(attr, 0); 2772 transformSet = true; 2773 break; 2774 case com.android.internal.R.styleable.View_rotation: 2775 rotation = a.getFloat(attr, 0); 2776 transformSet = true; 2777 break; 2778 case com.android.internal.R.styleable.View_rotationX: 2779 rotationX = a.getFloat(attr, 0); 2780 transformSet = true; 2781 break; 2782 case com.android.internal.R.styleable.View_rotationY: 2783 rotationY = a.getFloat(attr, 0); 2784 transformSet = true; 2785 break; 2786 case com.android.internal.R.styleable.View_scaleX: 2787 sx = a.getFloat(attr, 1f); 2788 transformSet = true; 2789 break; 2790 case com.android.internal.R.styleable.View_scaleY: 2791 sy = a.getFloat(attr, 1f); 2792 transformSet = true; 2793 break; 2794 case com.android.internal.R.styleable.View_id: 2795 mID = a.getResourceId(attr, NO_ID); 2796 break; 2797 case com.android.internal.R.styleable.View_tag: 2798 mTag = a.getText(attr); 2799 break; 2800 case com.android.internal.R.styleable.View_fitsSystemWindows: 2801 if (a.getBoolean(attr, false)) { 2802 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2803 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2804 } 2805 break; 2806 case com.android.internal.R.styleable.View_focusable: 2807 if (a.getBoolean(attr, false)) { 2808 viewFlagValues |= FOCUSABLE; 2809 viewFlagMasks |= FOCUSABLE_MASK; 2810 } 2811 break; 2812 case com.android.internal.R.styleable.View_focusableInTouchMode: 2813 if (a.getBoolean(attr, false)) { 2814 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2815 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2816 } 2817 break; 2818 case com.android.internal.R.styleable.View_clickable: 2819 if (a.getBoolean(attr, false)) { 2820 viewFlagValues |= CLICKABLE; 2821 viewFlagMasks |= CLICKABLE; 2822 } 2823 break; 2824 case com.android.internal.R.styleable.View_longClickable: 2825 if (a.getBoolean(attr, false)) { 2826 viewFlagValues |= LONG_CLICKABLE; 2827 viewFlagMasks |= LONG_CLICKABLE; 2828 } 2829 break; 2830 case com.android.internal.R.styleable.View_saveEnabled: 2831 if (!a.getBoolean(attr, true)) { 2832 viewFlagValues |= SAVE_DISABLED; 2833 viewFlagMasks |= SAVE_DISABLED_MASK; 2834 } 2835 break; 2836 case com.android.internal.R.styleable.View_duplicateParentState: 2837 if (a.getBoolean(attr, false)) { 2838 viewFlagValues |= DUPLICATE_PARENT_STATE; 2839 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2840 } 2841 break; 2842 case com.android.internal.R.styleable.View_visibility: 2843 final int visibility = a.getInt(attr, 0); 2844 if (visibility != 0) { 2845 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2846 viewFlagMasks |= VISIBILITY_MASK; 2847 } 2848 break; 2849 case com.android.internal.R.styleable.View_layoutDirection: 2850 // Clear any HORIZONTAL_DIRECTION flag already set 2851 viewFlagValues &= ~LAYOUT_DIRECTION_MASK; 2852 // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute 2853 final int layoutDirection = a.getInt(attr, -1); 2854 if (layoutDirection != -1) { 2855 viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection]; 2856 } else { 2857 // Set to default (LAYOUT_DIRECTION_INHERIT) 2858 viewFlagValues |= LAYOUT_DIRECTION_DEFAULT; 2859 } 2860 viewFlagMasks |= LAYOUT_DIRECTION_MASK; 2861 break; 2862 case com.android.internal.R.styleable.View_drawingCacheQuality: 2863 final int cacheQuality = a.getInt(attr, 0); 2864 if (cacheQuality != 0) { 2865 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2866 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2867 } 2868 break; 2869 case com.android.internal.R.styleable.View_contentDescription: 2870 mContentDescription = a.getString(attr); 2871 break; 2872 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2873 if (!a.getBoolean(attr, true)) { 2874 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2875 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2876 } 2877 break; 2878 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2879 if (!a.getBoolean(attr, true)) { 2880 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2881 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2882 } 2883 break; 2884 case R.styleable.View_scrollbars: 2885 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2886 if (scrollbars != SCROLLBARS_NONE) { 2887 viewFlagValues |= scrollbars; 2888 viewFlagMasks |= SCROLLBARS_MASK; 2889 initializeScrollbars(a); 2890 } 2891 break; 2892 case R.styleable.View_fadingEdge: 2893 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2894 if (fadingEdge != FADING_EDGE_NONE) { 2895 viewFlagValues |= fadingEdge; 2896 viewFlagMasks |= FADING_EDGE_MASK; 2897 initializeFadingEdge(a); 2898 } 2899 break; 2900 case R.styleable.View_scrollbarStyle: 2901 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2902 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2903 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2904 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2905 } 2906 break; 2907 case R.styleable.View_isScrollContainer: 2908 setScrollContainer = true; 2909 if (a.getBoolean(attr, false)) { 2910 setScrollContainer(true); 2911 } 2912 break; 2913 case com.android.internal.R.styleable.View_keepScreenOn: 2914 if (a.getBoolean(attr, false)) { 2915 viewFlagValues |= KEEP_SCREEN_ON; 2916 viewFlagMasks |= KEEP_SCREEN_ON; 2917 } 2918 break; 2919 case R.styleable.View_filterTouchesWhenObscured: 2920 if (a.getBoolean(attr, false)) { 2921 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2922 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2923 } 2924 break; 2925 case R.styleable.View_nextFocusLeft: 2926 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2927 break; 2928 case R.styleable.View_nextFocusRight: 2929 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2930 break; 2931 case R.styleable.View_nextFocusUp: 2932 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2933 break; 2934 case R.styleable.View_nextFocusDown: 2935 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2936 break; 2937 case R.styleable.View_nextFocusForward: 2938 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2939 break; 2940 case R.styleable.View_minWidth: 2941 mMinWidth = a.getDimensionPixelSize(attr, 0); 2942 break; 2943 case R.styleable.View_minHeight: 2944 mMinHeight = a.getDimensionPixelSize(attr, 0); 2945 break; 2946 case R.styleable.View_onClick: 2947 if (context.isRestricted()) { 2948 throw new IllegalStateException("The android:onClick attribute cannot " 2949 + "be used within a restricted context"); 2950 } 2951 2952 final String handlerName = a.getString(attr); 2953 if (handlerName != null) { 2954 setOnClickListener(new OnClickListener() { 2955 private Method mHandler; 2956 2957 public void onClick(View v) { 2958 if (mHandler == null) { 2959 try { 2960 mHandler = getContext().getClass().getMethod(handlerName, 2961 View.class); 2962 } catch (NoSuchMethodException e) { 2963 int id = getId(); 2964 String idText = id == NO_ID ? "" : " with id '" 2965 + getContext().getResources().getResourceEntryName( 2966 id) + "'"; 2967 throw new IllegalStateException("Could not find a method " + 2968 handlerName + "(View) in the activity " 2969 + getContext().getClass() + " for onClick handler" 2970 + " on view " + View.this.getClass() + idText, e); 2971 } 2972 } 2973 2974 try { 2975 mHandler.invoke(getContext(), View.this); 2976 } catch (IllegalAccessException e) { 2977 throw new IllegalStateException("Could not execute non " 2978 + "public method of the activity", e); 2979 } catch (InvocationTargetException e) { 2980 throw new IllegalStateException("Could not execute " 2981 + "method of the activity", e); 2982 } 2983 } 2984 }); 2985 } 2986 break; 2987 case R.styleable.View_overScrollMode: 2988 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2989 break; 2990 case R.styleable.View_verticalScrollbarPosition: 2991 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2992 break; 2993 case R.styleable.View_layerType: 2994 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2995 break; 2996 case R.styleable.View_textDirection: 2997 mTextDirection = a.getInt(attr, DEFAULT_TEXT_DIRECTION); 2998 break; 2999 } 3000 } 3001 3002 setOverScrollMode(overScrollMode); 3003 3004 if (background != null) { 3005 setBackgroundDrawable(background); 3006 } 3007 3008 mUserPaddingRelative = (startPadding >= 0 || endPadding >= 0); 3009 3010 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3011 // layout direction). Those cached values will be used later during padding resolution. 3012 mUserPaddingStart = startPadding; 3013 mUserPaddingEnd = endPadding; 3014 3015 if (padding >= 0) { 3016 leftPadding = padding; 3017 topPadding = padding; 3018 rightPadding = padding; 3019 bottomPadding = padding; 3020 } 3021 3022 // If the user specified the padding (either with android:padding or 3023 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3024 // use the default padding or the padding from the background drawable 3025 // (stored at this point in mPadding*) 3026 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3027 topPadding >= 0 ? topPadding : mPaddingTop, 3028 rightPadding >= 0 ? rightPadding : mPaddingRight, 3029 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3030 3031 if (viewFlagMasks != 0) { 3032 setFlags(viewFlagValues, viewFlagMasks); 3033 } 3034 3035 // Needs to be called after mViewFlags is set 3036 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3037 recomputePadding(); 3038 } 3039 3040 if (x != 0 || y != 0) { 3041 scrollTo(x, y); 3042 } 3043 3044 if (transformSet) { 3045 setTranslationX(tx); 3046 setTranslationY(ty); 3047 setRotation(rotation); 3048 setRotationX(rotationX); 3049 setRotationY(rotationY); 3050 setScaleX(sx); 3051 setScaleY(sy); 3052 } 3053 3054 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3055 setScrollContainer(true); 3056 } 3057 3058 computeOpaqueFlags(); 3059 3060 a.recycle(); 3061 } 3062 3063 /** 3064 * Non-public constructor for use in testing 3065 */ 3066 View() { 3067 } 3068 3069 /** 3070 * <p> 3071 * Initializes the fading edges from a given set of styled attributes. This 3072 * method should be called by subclasses that need fading edges and when an 3073 * instance of these subclasses is created programmatically rather than 3074 * being inflated from XML. This method is automatically called when the XML 3075 * is inflated. 3076 * </p> 3077 * 3078 * @param a the styled attributes set to initialize the fading edges from 3079 */ 3080 protected void initializeFadingEdge(TypedArray a) { 3081 initScrollCache(); 3082 3083 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3084 R.styleable.View_fadingEdgeLength, 3085 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3086 } 3087 3088 /** 3089 * Returns the size of the vertical faded edges used to indicate that more 3090 * content in this view is visible. 3091 * 3092 * @return The size in pixels of the vertical faded edge or 0 if vertical 3093 * faded edges are not enabled for this view. 3094 * @attr ref android.R.styleable#View_fadingEdgeLength 3095 */ 3096 public int getVerticalFadingEdgeLength() { 3097 if (isVerticalFadingEdgeEnabled()) { 3098 ScrollabilityCache cache = mScrollCache; 3099 if (cache != null) { 3100 return cache.fadingEdgeLength; 3101 } 3102 } 3103 return 0; 3104 } 3105 3106 /** 3107 * Set the size of the faded edge used to indicate that more content in this 3108 * view is available. Will not change whether the fading edge is enabled; use 3109 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3110 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3111 * for the vertical or horizontal fading edges. 3112 * 3113 * @param length The size in pixels of the faded edge used to indicate that more 3114 * content in this view is visible. 3115 */ 3116 public void setFadingEdgeLength(int length) { 3117 initScrollCache(); 3118 mScrollCache.fadingEdgeLength = length; 3119 } 3120 3121 /** 3122 * Returns the size of the horizontal faded edges used to indicate that more 3123 * content in this view is visible. 3124 * 3125 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3126 * faded edges are not enabled for this view. 3127 * @attr ref android.R.styleable#View_fadingEdgeLength 3128 */ 3129 public int getHorizontalFadingEdgeLength() { 3130 if (isHorizontalFadingEdgeEnabled()) { 3131 ScrollabilityCache cache = mScrollCache; 3132 if (cache != null) { 3133 return cache.fadingEdgeLength; 3134 } 3135 } 3136 return 0; 3137 } 3138 3139 /** 3140 * Returns the width of the vertical scrollbar. 3141 * 3142 * @return The width in pixels of the vertical scrollbar or 0 if there 3143 * is no vertical scrollbar. 3144 */ 3145 public int getVerticalScrollbarWidth() { 3146 ScrollabilityCache cache = mScrollCache; 3147 if (cache != null) { 3148 ScrollBarDrawable scrollBar = cache.scrollBar; 3149 if (scrollBar != null) { 3150 int size = scrollBar.getSize(true); 3151 if (size <= 0) { 3152 size = cache.scrollBarSize; 3153 } 3154 return size; 3155 } 3156 return 0; 3157 } 3158 return 0; 3159 } 3160 3161 /** 3162 * Returns the height of the horizontal scrollbar. 3163 * 3164 * @return The height in pixels of the horizontal scrollbar or 0 if 3165 * there is no horizontal scrollbar. 3166 */ 3167 protected int getHorizontalScrollbarHeight() { 3168 ScrollabilityCache cache = mScrollCache; 3169 if (cache != null) { 3170 ScrollBarDrawable scrollBar = cache.scrollBar; 3171 if (scrollBar != null) { 3172 int size = scrollBar.getSize(false); 3173 if (size <= 0) { 3174 size = cache.scrollBarSize; 3175 } 3176 return size; 3177 } 3178 return 0; 3179 } 3180 return 0; 3181 } 3182 3183 /** 3184 * <p> 3185 * Initializes the scrollbars from a given set of styled attributes. This 3186 * method should be called by subclasses that need scrollbars and when an 3187 * instance of these subclasses is created programmatically rather than 3188 * being inflated from XML. This method is automatically called when the XML 3189 * is inflated. 3190 * </p> 3191 * 3192 * @param a the styled attributes set to initialize the scrollbars from 3193 */ 3194 protected void initializeScrollbars(TypedArray a) { 3195 initScrollCache(); 3196 3197 final ScrollabilityCache scrollabilityCache = mScrollCache; 3198 3199 if (scrollabilityCache.scrollBar == null) { 3200 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3201 } 3202 3203 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3204 3205 if (!fadeScrollbars) { 3206 scrollabilityCache.state = ScrollabilityCache.ON; 3207 } 3208 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3209 3210 3211 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3212 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3213 .getScrollBarFadeDuration()); 3214 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3215 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3216 ViewConfiguration.getScrollDefaultDelay()); 3217 3218 3219 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3220 com.android.internal.R.styleable.View_scrollbarSize, 3221 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3222 3223 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3224 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3225 3226 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3227 if (thumb != null) { 3228 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3229 } 3230 3231 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3232 false); 3233 if (alwaysDraw) { 3234 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3235 } 3236 3237 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3238 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3239 3240 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3241 if (thumb != null) { 3242 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3243 } 3244 3245 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3246 false); 3247 if (alwaysDraw) { 3248 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3249 } 3250 3251 // Re-apply user/background padding so that scrollbar(s) get added 3252 resolvePadding(); 3253 } 3254 3255 /** 3256 * <p> 3257 * Initalizes the scrollability cache if necessary. 3258 * </p> 3259 */ 3260 private void initScrollCache() { 3261 if (mScrollCache == null) { 3262 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3263 } 3264 } 3265 3266 /** 3267 * Set the position of the vertical scroll bar. Should be one of 3268 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3269 * {@link #SCROLLBAR_POSITION_RIGHT}. 3270 * 3271 * @param position Where the vertical scroll bar should be positioned. 3272 */ 3273 public void setVerticalScrollbarPosition(int position) { 3274 if (mVerticalScrollbarPosition != position) { 3275 mVerticalScrollbarPosition = position; 3276 computeOpaqueFlags(); 3277 resolvePadding(); 3278 } 3279 } 3280 3281 /** 3282 * @return The position where the vertical scroll bar will show, if applicable. 3283 * @see #setVerticalScrollbarPosition(int) 3284 */ 3285 public int getVerticalScrollbarPosition() { 3286 return mVerticalScrollbarPosition; 3287 } 3288 3289 /** 3290 * Register a callback to be invoked when focus of this view changed. 3291 * 3292 * @param l The callback that will run. 3293 */ 3294 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3295 mOnFocusChangeListener = l; 3296 } 3297 3298 /** 3299 * Add a listener that will be called when the bounds of the view change due to 3300 * layout processing. 3301 * 3302 * @param listener The listener that will be called when layout bounds change. 3303 */ 3304 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3305 if (mOnLayoutChangeListeners == null) { 3306 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3307 } 3308 mOnLayoutChangeListeners.add(listener); 3309 } 3310 3311 /** 3312 * Remove a listener for layout changes. 3313 * 3314 * @param listener The listener for layout bounds change. 3315 */ 3316 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3317 if (mOnLayoutChangeListeners == null) { 3318 return; 3319 } 3320 mOnLayoutChangeListeners.remove(listener); 3321 } 3322 3323 /** 3324 * Add a listener for attach state changes. 3325 * 3326 * This listener will be called whenever this view is attached or detached 3327 * from a window. Remove the listener using 3328 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3329 * 3330 * @param listener Listener to attach 3331 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3332 */ 3333 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3334 if (mOnAttachStateChangeListeners == null) { 3335 mOnAttachStateChangeListeners = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3336 } 3337 mOnAttachStateChangeListeners.add(listener); 3338 } 3339 3340 /** 3341 * Remove a listener for attach state changes. The listener will receive no further 3342 * notification of window attach/detach events. 3343 * 3344 * @param listener Listener to remove 3345 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3346 */ 3347 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3348 if (mOnAttachStateChangeListeners == null) { 3349 return; 3350 } 3351 mOnAttachStateChangeListeners.remove(listener); 3352 } 3353 3354 /** 3355 * Returns the focus-change callback registered for this view. 3356 * 3357 * @return The callback, or null if one is not registered. 3358 */ 3359 public OnFocusChangeListener getOnFocusChangeListener() { 3360 return mOnFocusChangeListener; 3361 } 3362 3363 /** 3364 * Register a callback to be invoked when this view is clicked. If this view is not 3365 * clickable, it becomes clickable. 3366 * 3367 * @param l The callback that will run 3368 * 3369 * @see #setClickable(boolean) 3370 */ 3371 public void setOnClickListener(OnClickListener l) { 3372 if (!isClickable()) { 3373 setClickable(true); 3374 } 3375 mOnClickListener = l; 3376 } 3377 3378 /** 3379 * Register a callback to be invoked when this view is clicked and held. If this view is not 3380 * long clickable, it becomes long clickable. 3381 * 3382 * @param l The callback that will run 3383 * 3384 * @see #setLongClickable(boolean) 3385 */ 3386 public void setOnLongClickListener(OnLongClickListener l) { 3387 if (!isLongClickable()) { 3388 setLongClickable(true); 3389 } 3390 mOnLongClickListener = l; 3391 } 3392 3393 /** 3394 * Register a callback to be invoked when the context menu for this view is 3395 * being built. If this view is not long clickable, it becomes long clickable. 3396 * 3397 * @param l The callback that will run 3398 * 3399 */ 3400 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3401 if (!isLongClickable()) { 3402 setLongClickable(true); 3403 } 3404 mOnCreateContextMenuListener = l; 3405 } 3406 3407 /** 3408 * Call this view's OnClickListener, if it is defined. 3409 * 3410 * @return True there was an assigned OnClickListener that was called, false 3411 * otherwise is returned. 3412 */ 3413 public boolean performClick() { 3414 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3415 3416 if (mOnClickListener != null) { 3417 playSoundEffect(SoundEffectConstants.CLICK); 3418 mOnClickListener.onClick(this); 3419 return true; 3420 } 3421 3422 return false; 3423 } 3424 3425 /** 3426 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3427 * OnLongClickListener did not consume the event. 3428 * 3429 * @return True if one of the above receivers consumed the event, false otherwise. 3430 */ 3431 public boolean performLongClick() { 3432 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3433 3434 boolean handled = false; 3435 if (mOnLongClickListener != null) { 3436 handled = mOnLongClickListener.onLongClick(View.this); 3437 } 3438 if (!handled) { 3439 handled = showContextMenu(); 3440 } 3441 if (handled) { 3442 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3443 } 3444 return handled; 3445 } 3446 3447 /** 3448 * Performs button-related actions during a touch down event. 3449 * 3450 * @param event The event. 3451 * @return True if the down was consumed. 3452 * 3453 * @hide 3454 */ 3455 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3456 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3457 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3458 return true; 3459 } 3460 } 3461 return false; 3462 } 3463 3464 /** 3465 * Bring up the context menu for this view. 3466 * 3467 * @return Whether a context menu was displayed. 3468 */ 3469 public boolean showContextMenu() { 3470 return getParent().showContextMenuForChild(this); 3471 } 3472 3473 /** 3474 * Bring up the context menu for this view, referring to the item under the specified point. 3475 * 3476 * @param x The referenced x coordinate. 3477 * @param y The referenced y coordinate. 3478 * @param metaState The keyboard modifiers that were pressed. 3479 * @return Whether a context menu was displayed. 3480 * 3481 * @hide 3482 */ 3483 public boolean showContextMenu(float x, float y, int metaState) { 3484 return showContextMenu(); 3485 } 3486 3487 /** 3488 * Start an action mode. 3489 * 3490 * @param callback Callback that will control the lifecycle of the action mode 3491 * @return The new action mode if it is started, null otherwise 3492 * 3493 * @see ActionMode 3494 */ 3495 public ActionMode startActionMode(ActionMode.Callback callback) { 3496 return getParent().startActionModeForChild(this, callback); 3497 } 3498 3499 /** 3500 * Register a callback to be invoked when a key is pressed in this view. 3501 * @param l the key listener to attach to this view 3502 */ 3503 public void setOnKeyListener(OnKeyListener l) { 3504 mOnKeyListener = l; 3505 } 3506 3507 /** 3508 * Register a callback to be invoked when a touch event is sent to this view. 3509 * @param l the touch listener to attach to this view 3510 */ 3511 public void setOnTouchListener(OnTouchListener l) { 3512 mOnTouchListener = l; 3513 } 3514 3515 /** 3516 * Register a callback to be invoked when a generic motion event is sent to this view. 3517 * @param l the generic motion listener to attach to this view 3518 */ 3519 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3520 mOnGenericMotionListener = l; 3521 } 3522 3523 /** 3524 * Register a callback to be invoked when a hover event is sent to this view. 3525 * @param l the hover listener to attach to this view 3526 */ 3527 public void setOnHoverListener(OnHoverListener l) { 3528 mOnHoverListener = l; 3529 } 3530 3531 /** 3532 * Register a drag event listener callback object for this View. The parameter is 3533 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3534 * View, the system calls the 3535 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3536 * @param l An implementation of {@link android.view.View.OnDragListener}. 3537 */ 3538 public void setOnDragListener(OnDragListener l) { 3539 mOnDragListener = l; 3540 } 3541 3542 /** 3543 * Give this view focus. This will cause 3544 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3545 * 3546 * Note: this does not check whether this {@link View} should get focus, it just 3547 * gives it focus no matter what. It should only be called internally by framework 3548 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3549 * 3550 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3551 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3552 * focus moved when requestFocus() is called. It may not always 3553 * apply, in which case use the default View.FOCUS_DOWN. 3554 * @param previouslyFocusedRect The rectangle of the view that had focus 3555 * prior in this View's coordinate system. 3556 */ 3557 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3558 if (DBG) { 3559 System.out.println(this + " requestFocus()"); 3560 } 3561 3562 if ((mPrivateFlags & FOCUSED) == 0) { 3563 mPrivateFlags |= FOCUSED; 3564 3565 if (mParent != null) { 3566 mParent.requestChildFocus(this, this); 3567 } 3568 3569 onFocusChanged(true, direction, previouslyFocusedRect); 3570 refreshDrawableState(); 3571 } 3572 } 3573 3574 /** 3575 * Request that a rectangle of this view be visible on the screen, 3576 * scrolling if necessary just enough. 3577 * 3578 * <p>A View should call this if it maintains some notion of which part 3579 * of its content is interesting. For example, a text editing view 3580 * should call this when its cursor moves. 3581 * 3582 * @param rectangle The rectangle. 3583 * @return Whether any parent scrolled. 3584 */ 3585 public boolean requestRectangleOnScreen(Rect rectangle) { 3586 return requestRectangleOnScreen(rectangle, false); 3587 } 3588 3589 /** 3590 * Request that a rectangle of this view be visible on the screen, 3591 * scrolling if necessary just enough. 3592 * 3593 * <p>A View should call this if it maintains some notion of which part 3594 * of its content is interesting. For example, a text editing view 3595 * should call this when its cursor moves. 3596 * 3597 * <p>When <code>immediate</code> is set to true, scrolling will not be 3598 * animated. 3599 * 3600 * @param rectangle The rectangle. 3601 * @param immediate True to forbid animated scrolling, false otherwise 3602 * @return Whether any parent scrolled. 3603 */ 3604 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3605 View child = this; 3606 ViewParent parent = mParent; 3607 boolean scrolled = false; 3608 while (parent != null) { 3609 scrolled |= parent.requestChildRectangleOnScreen(child, 3610 rectangle, immediate); 3611 3612 // offset rect so next call has the rectangle in the 3613 // coordinate system of its direct child. 3614 rectangle.offset(child.getLeft(), child.getTop()); 3615 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3616 3617 if (!(parent instanceof View)) { 3618 break; 3619 } 3620 3621 child = (View) parent; 3622 parent = child.getParent(); 3623 } 3624 return scrolled; 3625 } 3626 3627 /** 3628 * Called when this view wants to give up focus. This will cause 3629 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3630 */ 3631 public void clearFocus() { 3632 if (DBG) { 3633 System.out.println(this + " clearFocus()"); 3634 } 3635 3636 if ((mPrivateFlags & FOCUSED) != 0) { 3637 mPrivateFlags &= ~FOCUSED; 3638 3639 if (mParent != null) { 3640 mParent.clearChildFocus(this); 3641 } 3642 3643 onFocusChanged(false, 0, null); 3644 refreshDrawableState(); 3645 } 3646 } 3647 3648 /** 3649 * Called to clear the focus of a view that is about to be removed. 3650 * Doesn't call clearChildFocus, which prevents this view from taking 3651 * focus again before it has been removed from the parent 3652 */ 3653 void clearFocusForRemoval() { 3654 if ((mPrivateFlags & FOCUSED) != 0) { 3655 mPrivateFlags &= ~FOCUSED; 3656 3657 onFocusChanged(false, 0, null); 3658 refreshDrawableState(); 3659 } 3660 } 3661 3662 /** 3663 * Called internally by the view system when a new view is getting focus. 3664 * This is what clears the old focus. 3665 */ 3666 void unFocus() { 3667 if (DBG) { 3668 System.out.println(this + " unFocus()"); 3669 } 3670 3671 if ((mPrivateFlags & FOCUSED) != 0) { 3672 mPrivateFlags &= ~FOCUSED; 3673 3674 onFocusChanged(false, 0, null); 3675 refreshDrawableState(); 3676 } 3677 } 3678 3679 /** 3680 * Returns true if this view has focus iteself, or is the ancestor of the 3681 * view that has focus. 3682 * 3683 * @return True if this view has or contains focus, false otherwise. 3684 */ 3685 @ViewDebug.ExportedProperty(category = "focus") 3686 public boolean hasFocus() { 3687 return (mPrivateFlags & FOCUSED) != 0; 3688 } 3689 3690 /** 3691 * Returns true if this view is focusable or if it contains a reachable View 3692 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3693 * is a View whose parents do not block descendants focus. 3694 * 3695 * Only {@link #VISIBLE} views are considered focusable. 3696 * 3697 * @return True if the view is focusable or if the view contains a focusable 3698 * View, false otherwise. 3699 * 3700 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3701 */ 3702 public boolean hasFocusable() { 3703 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3704 } 3705 3706 /** 3707 * Called by the view system when the focus state of this view changes. 3708 * When the focus change event is caused by directional navigation, direction 3709 * and previouslyFocusedRect provide insight into where the focus is coming from. 3710 * When overriding, be sure to call up through to the super class so that 3711 * the standard focus handling will occur. 3712 * 3713 * @param gainFocus True if the View has focus; false otherwise. 3714 * @param direction The direction focus has moved when requestFocus() 3715 * is called to give this view focus. Values are 3716 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3717 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3718 * It may not always apply, in which case use the default. 3719 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3720 * system, of the previously focused view. If applicable, this will be 3721 * passed in as finer grained information about where the focus is coming 3722 * from (in addition to direction). Will be <code>null</code> otherwise. 3723 */ 3724 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3725 if (gainFocus) { 3726 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3727 } 3728 3729 InputMethodManager imm = InputMethodManager.peekInstance(); 3730 if (!gainFocus) { 3731 if (isPressed()) { 3732 setPressed(false); 3733 } 3734 if (imm != null && mAttachInfo != null 3735 && mAttachInfo.mHasWindowFocus) { 3736 imm.focusOut(this); 3737 } 3738 onFocusLost(); 3739 } else if (imm != null && mAttachInfo != null 3740 && mAttachInfo.mHasWindowFocus) { 3741 imm.focusIn(this); 3742 } 3743 3744 invalidate(true); 3745 if (mOnFocusChangeListener != null) { 3746 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3747 } 3748 3749 if (mAttachInfo != null) { 3750 mAttachInfo.mKeyDispatchState.reset(this); 3751 } 3752 } 3753 3754 /** 3755 * Sends an accessibility event of the given type. If accessiiblity is 3756 * not enabled this method has no effect. The default implementation calls 3757 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3758 * to populate information about the event source (this View), then calls 3759 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3760 * populate the text content of the event source including its descendants, 3761 * and last calls 3762 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3763 * on its parent to resuest sending of the event to interested parties. 3764 * 3765 * @param eventType The type of the event to send. 3766 * 3767 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3768 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3769 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3770 */ 3771 public void sendAccessibilityEvent(int eventType) { 3772 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3773 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3774 } 3775 } 3776 3777 /** 3778 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3779 * takes as an argument an empty {@link AccessibilityEvent} and does not 3780 * perfrom a check whether accessibility is enabled. 3781 * 3782 * @param event The event to send. 3783 * 3784 * @see #sendAccessibilityEvent(int) 3785 */ 3786 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3787 if (!isShown()) { 3788 return; 3789 } 3790 onInitializeAccessibilityEvent(event); 3791 dispatchPopulateAccessibilityEvent(event); 3792 // In the beginning we called #isShown(), so we know that getParent() is not null. 3793 getParent().requestSendAccessibilityEvent(this, event); 3794 } 3795 3796 /** 3797 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 3798 * to its children for adding their text content to the event. Note that the 3799 * event text is populated in a separate dispatch path since we add to the 3800 * event not only the text of the source but also the text of all its descendants. 3801 * </p> 3802 * A typical implementation will call 3803 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 3804 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3805 * on each child. Override this method if custom population of the event text 3806 * content is required. 3807 * 3808 * @param event The event. 3809 * 3810 * @return True if the event population was completed. 3811 */ 3812 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3813 onPopulateAccessibilityEvent(event); 3814 return false; 3815 } 3816 3817 /** 3818 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3819 * giving a chance to this View to populate the accessibility event with its 3820 * text content. While the implementation is free to modify other event 3821 * attributes this should be performed in 3822 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 3823 * <p> 3824 * Example: Adding formatted date string to an accessibility event in addition 3825 * to the text added by the super implementation. 3826 * </p><p><pre><code> 3827 * public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3828 * super.onPopulateAccessibilityEvent(event); 3829 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 3830 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 3831 * mCurrentDate.getTimeInMillis(), flags); 3832 * event.getText().add(selectedDateUtterance); 3833 * } 3834 * </code></pre></p> 3835 * 3836 * @param event The accessibility event which to populate. 3837 * 3838 * @see #sendAccessibilityEvent(int) 3839 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3840 */ 3841 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3842 } 3843 3844 /** 3845 * Initializes an {@link AccessibilityEvent} with information about the 3846 * the type of the event and this View which is the event source. In other 3847 * words, the source of an accessibility event is the view whose state 3848 * change triggered firing the event. 3849 * <p> 3850 * Example: Setting the password property of an event in addition 3851 * to properties set by the super implementation. 3852 * </p><p><pre><code> 3853 * public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3854 * super.onInitializeAccessibilityEvent(event); 3855 * event.setPassword(true); 3856 * } 3857 * </code></pre></p> 3858 * @param event The event to initialeze. 3859 * 3860 * @see #sendAccessibilityEvent(int) 3861 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3862 */ 3863 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3864 event.setSource(this); 3865 event.setClassName(getClass().getName()); 3866 event.setPackageName(getContext().getPackageName()); 3867 event.setEnabled(isEnabled()); 3868 event.setContentDescription(mContentDescription); 3869 3870 final int eventType = event.getEventType(); 3871 switch (eventType) { 3872 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 3873 if (mAttachInfo != null) { 3874 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3875 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 3876 FOCUSABLES_ALL); 3877 event.setItemCount(focusablesTempList.size()); 3878 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3879 focusablesTempList.clear(); 3880 } 3881 } break; 3882 case AccessibilityEvent.TYPE_VIEW_SCROLLED: { 3883 event.setScrollX(mScrollX); 3884 event.setScrollY(mScrollY); 3885 event.setItemCount(getHeight()); 3886 } break; 3887 } 3888 } 3889 3890 /** 3891 * Returns an {@link AccessibilityNodeInfo} representing this view from the 3892 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 3893 * This method is responsible for obtaining an accessibility node info from a 3894 * pool of reusable instances and calling 3895 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 3896 * initialize the former. 3897 * <p> 3898 * Note: The client is responsible for recycling the obtained instance by calling 3899 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 3900 * </p> 3901 * @return A populated {@link AccessibilityNodeInfo}. 3902 * 3903 * @see AccessibilityNodeInfo 3904 */ 3905 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 3906 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 3907 onInitializeAccessibilityNodeInfo(info); 3908 return info; 3909 } 3910 3911 /** 3912 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 3913 * The base implementation sets: 3914 * <ul> 3915 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 3916 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 3917 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 3918 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 3919 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 3920 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 3921 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 3922 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 3923 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 3924 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 3925 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 3926 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 3927 * </ul> 3928 * <p> 3929 * Subclasses should override this method, call the super implementation, 3930 * and set additional attributes. 3931 * </p> 3932 * @param info The instance to initialize. 3933 */ 3934 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 3935 Rect bounds = mAttachInfo.mTmpInvalRect; 3936 getDrawingRect(bounds); 3937 info.setBoundsInParent(bounds); 3938 3939 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 3940 getLocationOnScreen(locationOnScreen); 3941 bounds.offsetTo(0, 0); 3942 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 3943 info.setBoundsInScreen(bounds); 3944 3945 ViewParent parent = getParent(); 3946 if (parent instanceof View) { 3947 View parentView = (View) parent; 3948 info.setParent(parentView); 3949 } 3950 3951 info.setPackageName(mContext.getPackageName()); 3952 info.setClassName(getClass().getName()); 3953 info.setContentDescription(getContentDescription()); 3954 3955 info.setEnabled(isEnabled()); 3956 info.setClickable(isClickable()); 3957 info.setFocusable(isFocusable()); 3958 info.setFocused(isFocused()); 3959 info.setSelected(isSelected()); 3960 info.setLongClickable(isLongClickable()); 3961 3962 // TODO: These make sense only if we are in an AdapterView but all 3963 // views can be selected. Maybe from accessiiblity perspective 3964 // we should report as selectable view in an AdapterView. 3965 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 3966 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 3967 3968 if (isFocusable()) { 3969 if (isFocused()) { 3970 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 3971 } else { 3972 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 3973 } 3974 } 3975 } 3976 3977 /** 3978 * Gets the unique identifier of this view on the screen for accessibility purposes. 3979 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 3980 * 3981 * @return The view accessibility id. 3982 * 3983 * @hide 3984 */ 3985 public int getAccessibilityViewId() { 3986 if (mAccessibilityViewId == NO_ID) { 3987 mAccessibilityViewId = sNextAccessibilityViewId++; 3988 } 3989 return mAccessibilityViewId; 3990 } 3991 3992 /** 3993 * Gets the unique identifier of the window in which this View reseides. 3994 * 3995 * @return The window accessibility id. 3996 * 3997 * @hide 3998 */ 3999 public int getAccessibilityWindowId() { 4000 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4001 } 4002 4003 /** 4004 * Gets the {@link View} description. It briefly describes the view and is 4005 * primarily used for accessibility support. Set this property to enable 4006 * better accessibility support for your application. This is especially 4007 * true for views that do not have textual representation (For example, 4008 * ImageButton). 4009 * 4010 * @return The content descriptiopn. 4011 * 4012 * @attr ref android.R.styleable#View_contentDescription 4013 */ 4014 public CharSequence getContentDescription() { 4015 return mContentDescription; 4016 } 4017 4018 /** 4019 * Sets the {@link View} description. It briefly describes the view and is 4020 * primarily used for accessibility support. Set this property to enable 4021 * better accessibility support for your application. This is especially 4022 * true for views that do not have textual representation (For example, 4023 * ImageButton). 4024 * 4025 * @param contentDescription The content description. 4026 * 4027 * @attr ref android.R.styleable#View_contentDescription 4028 */ 4029 public void setContentDescription(CharSequence contentDescription) { 4030 mContentDescription = contentDescription; 4031 } 4032 4033 /** 4034 * Invoked whenever this view loses focus, either by losing window focus or by losing 4035 * focus within its window. This method can be used to clear any state tied to the 4036 * focus. For instance, if a button is held pressed with the trackball and the window 4037 * loses focus, this method can be used to cancel the press. 4038 * 4039 * Subclasses of View overriding this method should always call super.onFocusLost(). 4040 * 4041 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4042 * @see #onWindowFocusChanged(boolean) 4043 * 4044 * @hide pending API council approval 4045 */ 4046 protected void onFocusLost() { 4047 resetPressedState(); 4048 } 4049 4050 private void resetPressedState() { 4051 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4052 return; 4053 } 4054 4055 if (isPressed()) { 4056 setPressed(false); 4057 4058 if (!mHasPerformedLongPress) { 4059 removeLongPressCallback(); 4060 } 4061 } 4062 } 4063 4064 /** 4065 * Returns true if this view has focus 4066 * 4067 * @return True if this view has focus, false otherwise. 4068 */ 4069 @ViewDebug.ExportedProperty(category = "focus") 4070 public boolean isFocused() { 4071 return (mPrivateFlags & FOCUSED) != 0; 4072 } 4073 4074 /** 4075 * Find the view in the hierarchy rooted at this view that currently has 4076 * focus. 4077 * 4078 * @return The view that currently has focus, or null if no focused view can 4079 * be found. 4080 */ 4081 public View findFocus() { 4082 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4083 } 4084 4085 /** 4086 * Change whether this view is one of the set of scrollable containers in 4087 * its window. This will be used to determine whether the window can 4088 * resize or must pan when a soft input area is open -- scrollable 4089 * containers allow the window to use resize mode since the container 4090 * will appropriately shrink. 4091 */ 4092 public void setScrollContainer(boolean isScrollContainer) { 4093 if (isScrollContainer) { 4094 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4095 mAttachInfo.mScrollContainers.add(this); 4096 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4097 } 4098 mPrivateFlags |= SCROLL_CONTAINER; 4099 } else { 4100 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4101 mAttachInfo.mScrollContainers.remove(this); 4102 } 4103 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4104 } 4105 } 4106 4107 /** 4108 * Returns the quality of the drawing cache. 4109 * 4110 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4111 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4112 * 4113 * @see #setDrawingCacheQuality(int) 4114 * @see #setDrawingCacheEnabled(boolean) 4115 * @see #isDrawingCacheEnabled() 4116 * 4117 * @attr ref android.R.styleable#View_drawingCacheQuality 4118 */ 4119 public int getDrawingCacheQuality() { 4120 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4121 } 4122 4123 /** 4124 * Set the drawing cache quality of this view. This value is used only when the 4125 * drawing cache is enabled 4126 * 4127 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4128 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4129 * 4130 * @see #getDrawingCacheQuality() 4131 * @see #setDrawingCacheEnabled(boolean) 4132 * @see #isDrawingCacheEnabled() 4133 * 4134 * @attr ref android.R.styleable#View_drawingCacheQuality 4135 */ 4136 public void setDrawingCacheQuality(int quality) { 4137 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4138 } 4139 4140 /** 4141 * Returns whether the screen should remain on, corresponding to the current 4142 * value of {@link #KEEP_SCREEN_ON}. 4143 * 4144 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4145 * 4146 * @see #setKeepScreenOn(boolean) 4147 * 4148 * @attr ref android.R.styleable#View_keepScreenOn 4149 */ 4150 public boolean getKeepScreenOn() { 4151 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4152 } 4153 4154 /** 4155 * Controls whether the screen should remain on, modifying the 4156 * value of {@link #KEEP_SCREEN_ON}. 4157 * 4158 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4159 * 4160 * @see #getKeepScreenOn() 4161 * 4162 * @attr ref android.R.styleable#View_keepScreenOn 4163 */ 4164 public void setKeepScreenOn(boolean keepScreenOn) { 4165 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4166 } 4167 4168 /** 4169 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4170 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4171 * 4172 * @attr ref android.R.styleable#View_nextFocusLeft 4173 */ 4174 public int getNextFocusLeftId() { 4175 return mNextFocusLeftId; 4176 } 4177 4178 /** 4179 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4180 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4181 * decide automatically. 4182 * 4183 * @attr ref android.R.styleable#View_nextFocusLeft 4184 */ 4185 public void setNextFocusLeftId(int nextFocusLeftId) { 4186 mNextFocusLeftId = nextFocusLeftId; 4187 } 4188 4189 /** 4190 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4191 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4192 * 4193 * @attr ref android.R.styleable#View_nextFocusRight 4194 */ 4195 public int getNextFocusRightId() { 4196 return mNextFocusRightId; 4197 } 4198 4199 /** 4200 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4201 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4202 * decide automatically. 4203 * 4204 * @attr ref android.R.styleable#View_nextFocusRight 4205 */ 4206 public void setNextFocusRightId(int nextFocusRightId) { 4207 mNextFocusRightId = nextFocusRightId; 4208 } 4209 4210 /** 4211 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4212 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4213 * 4214 * @attr ref android.R.styleable#View_nextFocusUp 4215 */ 4216 public int getNextFocusUpId() { 4217 return mNextFocusUpId; 4218 } 4219 4220 /** 4221 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4222 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4223 * decide automatically. 4224 * 4225 * @attr ref android.R.styleable#View_nextFocusUp 4226 */ 4227 public void setNextFocusUpId(int nextFocusUpId) { 4228 mNextFocusUpId = nextFocusUpId; 4229 } 4230 4231 /** 4232 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4233 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4234 * 4235 * @attr ref android.R.styleable#View_nextFocusDown 4236 */ 4237 public int getNextFocusDownId() { 4238 return mNextFocusDownId; 4239 } 4240 4241 /** 4242 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4243 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4244 * decide automatically. 4245 * 4246 * @attr ref android.R.styleable#View_nextFocusDown 4247 */ 4248 public void setNextFocusDownId(int nextFocusDownId) { 4249 mNextFocusDownId = nextFocusDownId; 4250 } 4251 4252 /** 4253 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4254 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4255 * 4256 * @attr ref android.R.styleable#View_nextFocusForward 4257 */ 4258 public int getNextFocusForwardId() { 4259 return mNextFocusForwardId; 4260 } 4261 4262 /** 4263 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4264 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4265 * decide automatically. 4266 * 4267 * @attr ref android.R.styleable#View_nextFocusForward 4268 */ 4269 public void setNextFocusForwardId(int nextFocusForwardId) { 4270 mNextFocusForwardId = nextFocusForwardId; 4271 } 4272 4273 /** 4274 * Returns the visibility of this view and all of its ancestors 4275 * 4276 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4277 */ 4278 public boolean isShown() { 4279 View current = this; 4280 //noinspection ConstantConditions 4281 do { 4282 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4283 return false; 4284 } 4285 ViewParent parent = current.mParent; 4286 if (parent == null) { 4287 return false; // We are not attached to the view root 4288 } 4289 if (!(parent instanceof View)) { 4290 return true; 4291 } 4292 current = (View) parent; 4293 } while (current != null); 4294 4295 return false; 4296 } 4297 4298 /** 4299 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4300 * is set 4301 * 4302 * @param insets Insets for system windows 4303 * 4304 * @return True if this view applied the insets, false otherwise 4305 */ 4306 protected boolean fitSystemWindows(Rect insets) { 4307 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4308 mPaddingLeft = insets.left; 4309 mPaddingTop = insets.top; 4310 mPaddingRight = insets.right; 4311 mPaddingBottom = insets.bottom; 4312 requestLayout(); 4313 return true; 4314 } 4315 return false; 4316 } 4317 4318 /** 4319 * Set whether or not this view should account for system screen decorations 4320 * such as the status bar and inset its content. This allows this view to be 4321 * positioned in absolute screen coordinates and remain visible to the user. 4322 * 4323 * <p>This should only be used by top-level window decor views. 4324 * 4325 * @param fitSystemWindows true to inset content for system screen decorations, false for 4326 * default behavior. 4327 * 4328 * @attr ref android.R.styleable#View_fitsSystemWindows 4329 */ 4330 public void setFitsSystemWindows(boolean fitSystemWindows) { 4331 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 4332 } 4333 4334 /** 4335 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 4336 * will account for system screen decorations such as the status bar and inset its 4337 * content. This allows the view to be positioned in absolute screen coordinates 4338 * and remain visible to the user. 4339 * 4340 * @return true if this view will adjust its content bounds for system screen decorations. 4341 * 4342 * @attr ref android.R.styleable#View_fitsSystemWindows 4343 */ 4344 public boolean fitsSystemWindows() { 4345 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 4346 } 4347 4348 /** 4349 * Returns the visibility status for this view. 4350 * 4351 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4352 * @attr ref android.R.styleable#View_visibility 4353 */ 4354 @ViewDebug.ExportedProperty(mapping = { 4355 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4356 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4357 @ViewDebug.IntToString(from = GONE, to = "GONE") 4358 }) 4359 public int getVisibility() { 4360 return mViewFlags & VISIBILITY_MASK; 4361 } 4362 4363 /** 4364 * Set the enabled state of this view. 4365 * 4366 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4367 * @attr ref android.R.styleable#View_visibility 4368 */ 4369 @RemotableViewMethod 4370 public void setVisibility(int visibility) { 4371 setFlags(visibility, VISIBILITY_MASK); 4372 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4373 } 4374 4375 /** 4376 * Returns the enabled status for this view. The interpretation of the 4377 * enabled state varies by subclass. 4378 * 4379 * @return True if this view is enabled, false otherwise. 4380 */ 4381 @ViewDebug.ExportedProperty 4382 public boolean isEnabled() { 4383 return (mViewFlags & ENABLED_MASK) == ENABLED; 4384 } 4385 4386 /** 4387 * Set the enabled state of this view. The interpretation of the enabled 4388 * state varies by subclass. 4389 * 4390 * @param enabled True if this view is enabled, false otherwise. 4391 */ 4392 @RemotableViewMethod 4393 public void setEnabled(boolean enabled) { 4394 if (enabled == isEnabled()) return; 4395 4396 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4397 4398 /* 4399 * The View most likely has to change its appearance, so refresh 4400 * the drawable state. 4401 */ 4402 refreshDrawableState(); 4403 4404 // Invalidate too, since the default behavior for views is to be 4405 // be drawn at 50% alpha rather than to change the drawable. 4406 invalidate(true); 4407 } 4408 4409 /** 4410 * Set whether this view can receive the focus. 4411 * 4412 * Setting this to false will also ensure that this view is not focusable 4413 * in touch mode. 4414 * 4415 * @param focusable If true, this view can receive the focus. 4416 * 4417 * @see #setFocusableInTouchMode(boolean) 4418 * @attr ref android.R.styleable#View_focusable 4419 */ 4420 public void setFocusable(boolean focusable) { 4421 if (!focusable) { 4422 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4423 } 4424 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4425 } 4426 4427 /** 4428 * Set whether this view can receive focus while in touch mode. 4429 * 4430 * Setting this to true will also ensure that this view is focusable. 4431 * 4432 * @param focusableInTouchMode If true, this view can receive the focus while 4433 * in touch mode. 4434 * 4435 * @see #setFocusable(boolean) 4436 * @attr ref android.R.styleable#View_focusableInTouchMode 4437 */ 4438 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4439 // Focusable in touch mode should always be set before the focusable flag 4440 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4441 // which, in touch mode, will not successfully request focus on this view 4442 // because the focusable in touch mode flag is not set 4443 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4444 if (focusableInTouchMode) { 4445 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4446 } 4447 } 4448 4449 /** 4450 * Set whether this view should have sound effects enabled for events such as 4451 * clicking and touching. 4452 * 4453 * <p>You may wish to disable sound effects for a view if you already play sounds, 4454 * for instance, a dial key that plays dtmf tones. 4455 * 4456 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4457 * @see #isSoundEffectsEnabled() 4458 * @see #playSoundEffect(int) 4459 * @attr ref android.R.styleable#View_soundEffectsEnabled 4460 */ 4461 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4462 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4463 } 4464 4465 /** 4466 * @return whether this view should have sound effects enabled for events such as 4467 * clicking and touching. 4468 * 4469 * @see #setSoundEffectsEnabled(boolean) 4470 * @see #playSoundEffect(int) 4471 * @attr ref android.R.styleable#View_soundEffectsEnabled 4472 */ 4473 @ViewDebug.ExportedProperty 4474 public boolean isSoundEffectsEnabled() { 4475 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4476 } 4477 4478 /** 4479 * Set whether this view should have haptic feedback for events such as 4480 * long presses. 4481 * 4482 * <p>You may wish to disable haptic feedback if your view already controls 4483 * its own haptic feedback. 4484 * 4485 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4486 * @see #isHapticFeedbackEnabled() 4487 * @see #performHapticFeedback(int) 4488 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4489 */ 4490 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4491 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4492 } 4493 4494 /** 4495 * @return whether this view should have haptic feedback enabled for events 4496 * long presses. 4497 * 4498 * @see #setHapticFeedbackEnabled(boolean) 4499 * @see #performHapticFeedback(int) 4500 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4501 */ 4502 @ViewDebug.ExportedProperty 4503 public boolean isHapticFeedbackEnabled() { 4504 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4505 } 4506 4507 /** 4508 * Returns the layout direction for this view. 4509 * 4510 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4511 * {@link #LAYOUT_DIRECTION_RTL}, 4512 * {@link #LAYOUT_DIRECTION_INHERIT} or 4513 * {@link #LAYOUT_DIRECTION_LOCALE}. 4514 * @attr ref android.R.styleable#View_layoutDirection 4515 * 4516 * @hide 4517 */ 4518 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4519 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4520 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4521 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4522 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4523 }) 4524 public int getLayoutDirection() { 4525 return mViewFlags & LAYOUT_DIRECTION_MASK; 4526 } 4527 4528 /** 4529 * Set the layout direction for this view. This will propagate a reset of layout direction 4530 * resolution to the view's children and resolve layout direction for this view. 4531 * 4532 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4533 * {@link #LAYOUT_DIRECTION_RTL}, 4534 * {@link #LAYOUT_DIRECTION_INHERIT} or 4535 * {@link #LAYOUT_DIRECTION_LOCALE}. 4536 * 4537 * @attr ref android.R.styleable#View_layoutDirection 4538 * 4539 * @hide 4540 */ 4541 @RemotableViewMethod 4542 public void setLayoutDirection(int layoutDirection) { 4543 if (getLayoutDirection() != layoutDirection) { 4544 resetResolvedLayoutDirection(); 4545 // Setting the flag will also request a layout. 4546 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4547 } 4548 } 4549 4550 /** 4551 * Returns the resolved layout direction for this view. 4552 * 4553 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4554 * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL. 4555 * 4556 * @hide 4557 */ 4558 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4559 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4560 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4561 }) 4562 public int getResolvedLayoutDirection() { 4563 resolveLayoutDirectionIfNeeded(); 4564 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 4565 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4566 } 4567 4568 /** 4569 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 4570 * layout attribute and/or the inherited value from the parent.</p> 4571 * 4572 * @return true if the layout is right-to-left. 4573 * 4574 * @hide 4575 */ 4576 @ViewDebug.ExportedProperty(category = "layout") 4577 public boolean isLayoutRtl() { 4578 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4579 } 4580 4581 /** 4582 * If this view doesn't do any drawing on its own, set this flag to 4583 * allow further optimizations. By default, this flag is not set on 4584 * View, but could be set on some View subclasses such as ViewGroup. 4585 * 4586 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4587 * you should clear this flag. 4588 * 4589 * @param willNotDraw whether or not this View draw on its own 4590 */ 4591 public void setWillNotDraw(boolean willNotDraw) { 4592 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4593 } 4594 4595 /** 4596 * Returns whether or not this View draws on its own. 4597 * 4598 * @return true if this view has nothing to draw, false otherwise 4599 */ 4600 @ViewDebug.ExportedProperty(category = "drawing") 4601 public boolean willNotDraw() { 4602 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4603 } 4604 4605 /** 4606 * When a View's drawing cache is enabled, drawing is redirected to an 4607 * offscreen bitmap. Some views, like an ImageView, must be able to 4608 * bypass this mechanism if they already draw a single bitmap, to avoid 4609 * unnecessary usage of the memory. 4610 * 4611 * @param willNotCacheDrawing true if this view does not cache its 4612 * drawing, false otherwise 4613 */ 4614 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 4615 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 4616 } 4617 4618 /** 4619 * Returns whether or not this View can cache its drawing or not. 4620 * 4621 * @return true if this view does not cache its drawing, false otherwise 4622 */ 4623 @ViewDebug.ExportedProperty(category = "drawing") 4624 public boolean willNotCacheDrawing() { 4625 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 4626 } 4627 4628 /** 4629 * Indicates whether this view reacts to click events or not. 4630 * 4631 * @return true if the view is clickable, false otherwise 4632 * 4633 * @see #setClickable(boolean) 4634 * @attr ref android.R.styleable#View_clickable 4635 */ 4636 @ViewDebug.ExportedProperty 4637 public boolean isClickable() { 4638 return (mViewFlags & CLICKABLE) == CLICKABLE; 4639 } 4640 4641 /** 4642 * Enables or disables click events for this view. When a view 4643 * is clickable it will change its state to "pressed" on every click. 4644 * Subclasses should set the view clickable to visually react to 4645 * user's clicks. 4646 * 4647 * @param clickable true to make the view clickable, false otherwise 4648 * 4649 * @see #isClickable() 4650 * @attr ref android.R.styleable#View_clickable 4651 */ 4652 public void setClickable(boolean clickable) { 4653 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 4654 } 4655 4656 /** 4657 * Indicates whether this view reacts to long click events or not. 4658 * 4659 * @return true if the view is long clickable, false otherwise 4660 * 4661 * @see #setLongClickable(boolean) 4662 * @attr ref android.R.styleable#View_longClickable 4663 */ 4664 public boolean isLongClickable() { 4665 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4666 } 4667 4668 /** 4669 * Enables or disables long click events for this view. When a view is long 4670 * clickable it reacts to the user holding down the button for a longer 4671 * duration than a tap. This event can either launch the listener or a 4672 * context menu. 4673 * 4674 * @param longClickable true to make the view long clickable, false otherwise 4675 * @see #isLongClickable() 4676 * @attr ref android.R.styleable#View_longClickable 4677 */ 4678 public void setLongClickable(boolean longClickable) { 4679 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4680 } 4681 4682 /** 4683 * Sets the pressed state for this view. 4684 * 4685 * @see #isClickable() 4686 * @see #setClickable(boolean) 4687 * 4688 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4689 * the View's internal state from a previously set "pressed" state. 4690 */ 4691 public void setPressed(boolean pressed) { 4692 if (pressed) { 4693 mPrivateFlags |= PRESSED; 4694 } else { 4695 mPrivateFlags &= ~PRESSED; 4696 } 4697 refreshDrawableState(); 4698 dispatchSetPressed(pressed); 4699 } 4700 4701 /** 4702 * Dispatch setPressed to all of this View's children. 4703 * 4704 * @see #setPressed(boolean) 4705 * 4706 * @param pressed The new pressed state 4707 */ 4708 protected void dispatchSetPressed(boolean pressed) { 4709 } 4710 4711 /** 4712 * Indicates whether the view is currently in pressed state. Unless 4713 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 4714 * the pressed state. 4715 * 4716 * @see #setPressed(boolean) 4717 * @see #isClickable() 4718 * @see #setClickable(boolean) 4719 * 4720 * @return true if the view is currently pressed, false otherwise 4721 */ 4722 public boolean isPressed() { 4723 return (mPrivateFlags & PRESSED) == PRESSED; 4724 } 4725 4726 /** 4727 * Indicates whether this view will save its state (that is, 4728 * whether its {@link #onSaveInstanceState} method will be called). 4729 * 4730 * @return Returns true if the view state saving is enabled, else false. 4731 * 4732 * @see #setSaveEnabled(boolean) 4733 * @attr ref android.R.styleable#View_saveEnabled 4734 */ 4735 public boolean isSaveEnabled() { 4736 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 4737 } 4738 4739 /** 4740 * Controls whether the saving of this view's state is 4741 * enabled (that is, whether its {@link #onSaveInstanceState} method 4742 * will be called). Note that even if freezing is enabled, the 4743 * view still must have an id assigned to it (via {@link #setId(int)}) 4744 * for its state to be saved. This flag can only disable the 4745 * saving of this view; any child views may still have their state saved. 4746 * 4747 * @param enabled Set to false to <em>disable</em> state saving, or true 4748 * (the default) to allow it. 4749 * 4750 * @see #isSaveEnabled() 4751 * @see #setId(int) 4752 * @see #onSaveInstanceState() 4753 * @attr ref android.R.styleable#View_saveEnabled 4754 */ 4755 public void setSaveEnabled(boolean enabled) { 4756 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 4757 } 4758 4759 /** 4760 * Gets whether the framework should discard touches when the view's 4761 * window is obscured by another visible window. 4762 * Refer to the {@link View} security documentation for more details. 4763 * 4764 * @return True if touch filtering is enabled. 4765 * 4766 * @see #setFilterTouchesWhenObscured(boolean) 4767 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4768 */ 4769 @ViewDebug.ExportedProperty 4770 public boolean getFilterTouchesWhenObscured() { 4771 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4772 } 4773 4774 /** 4775 * Sets whether the framework should discard touches when the view's 4776 * window is obscured by another visible window. 4777 * Refer to the {@link View} security documentation for more details. 4778 * 4779 * @param enabled True if touch filtering should be enabled. 4780 * 4781 * @see #getFilterTouchesWhenObscured 4782 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4783 */ 4784 public void setFilterTouchesWhenObscured(boolean enabled) { 4785 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4786 FILTER_TOUCHES_WHEN_OBSCURED); 4787 } 4788 4789 /** 4790 * Indicates whether the entire hierarchy under this view will save its 4791 * state when a state saving traversal occurs from its parent. The default 4792 * is true; if false, these views will not be saved unless 4793 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4794 * 4795 * @return Returns true if the view state saving from parent is enabled, else false. 4796 * 4797 * @see #setSaveFromParentEnabled(boolean) 4798 */ 4799 public boolean isSaveFromParentEnabled() { 4800 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4801 } 4802 4803 /** 4804 * Controls whether the entire hierarchy under this view will save its 4805 * state when a state saving traversal occurs from its parent. The default 4806 * is true; if false, these views will not be saved unless 4807 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4808 * 4809 * @param enabled Set to false to <em>disable</em> state saving, or true 4810 * (the default) to allow it. 4811 * 4812 * @see #isSaveFromParentEnabled() 4813 * @see #setId(int) 4814 * @see #onSaveInstanceState() 4815 */ 4816 public void setSaveFromParentEnabled(boolean enabled) { 4817 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4818 } 4819 4820 4821 /** 4822 * Returns whether this View is able to take focus. 4823 * 4824 * @return True if this view can take focus, or false otherwise. 4825 * @attr ref android.R.styleable#View_focusable 4826 */ 4827 @ViewDebug.ExportedProperty(category = "focus") 4828 public final boolean isFocusable() { 4829 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4830 } 4831 4832 /** 4833 * When a view is focusable, it may not want to take focus when in touch mode. 4834 * For example, a button would like focus when the user is navigating via a D-pad 4835 * so that the user can click on it, but once the user starts touching the screen, 4836 * the button shouldn't take focus 4837 * @return Whether the view is focusable in touch mode. 4838 * @attr ref android.R.styleable#View_focusableInTouchMode 4839 */ 4840 @ViewDebug.ExportedProperty 4841 public final boolean isFocusableInTouchMode() { 4842 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4843 } 4844 4845 /** 4846 * Find the nearest view in the specified direction that can take focus. 4847 * This does not actually give focus to that view. 4848 * 4849 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4850 * 4851 * @return The nearest focusable in the specified direction, or null if none 4852 * can be found. 4853 */ 4854 public View focusSearch(int direction) { 4855 if (mParent != null) { 4856 return mParent.focusSearch(this, direction); 4857 } else { 4858 return null; 4859 } 4860 } 4861 4862 /** 4863 * This method is the last chance for the focused view and its ancestors to 4864 * respond to an arrow key. This is called when the focused view did not 4865 * consume the key internally, nor could the view system find a new view in 4866 * the requested direction to give focus to. 4867 * 4868 * @param focused The currently focused view. 4869 * @param direction The direction focus wants to move. One of FOCUS_UP, 4870 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4871 * @return True if the this view consumed this unhandled move. 4872 */ 4873 public boolean dispatchUnhandledMove(View focused, int direction) { 4874 return false; 4875 } 4876 4877 /** 4878 * If a user manually specified the next view id for a particular direction, 4879 * use the root to look up the view. 4880 * @param root The root view of the hierarchy containing this view. 4881 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4882 * or FOCUS_BACKWARD. 4883 * @return The user specified next view, or null if there is none. 4884 */ 4885 View findUserSetNextFocus(View root, int direction) { 4886 switch (direction) { 4887 case FOCUS_LEFT: 4888 if (mNextFocusLeftId == View.NO_ID) return null; 4889 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 4890 case FOCUS_RIGHT: 4891 if (mNextFocusRightId == View.NO_ID) return null; 4892 return findViewInsideOutShouldExist(root, mNextFocusRightId); 4893 case FOCUS_UP: 4894 if (mNextFocusUpId == View.NO_ID) return null; 4895 return findViewInsideOutShouldExist(root, mNextFocusUpId); 4896 case FOCUS_DOWN: 4897 if (mNextFocusDownId == View.NO_ID) return null; 4898 return findViewInsideOutShouldExist(root, mNextFocusDownId); 4899 case FOCUS_FORWARD: 4900 if (mNextFocusForwardId == View.NO_ID) return null; 4901 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 4902 case FOCUS_BACKWARD: { 4903 final int id = mID; 4904 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 4905 @Override 4906 public boolean apply(View t) { 4907 return t.mNextFocusForwardId == id; 4908 } 4909 }); 4910 } 4911 } 4912 return null; 4913 } 4914 4915 private View findViewInsideOutShouldExist(View root, final int childViewId) { 4916 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 4917 @Override 4918 public boolean apply(View t) { 4919 return t.mID == childViewId; 4920 } 4921 }); 4922 4923 if (result == null) { 4924 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4925 + "by user for id " + childViewId); 4926 } 4927 return result; 4928 } 4929 4930 /** 4931 * Find and return all focusable views that are descendants of this view, 4932 * possibly including this view if it is focusable itself. 4933 * 4934 * @param direction The direction of the focus 4935 * @return A list of focusable views 4936 */ 4937 public ArrayList<View> getFocusables(int direction) { 4938 ArrayList<View> result = new ArrayList<View>(24); 4939 addFocusables(result, direction); 4940 return result; 4941 } 4942 4943 /** 4944 * Add any focusable views that are descendants of this view (possibly 4945 * including this view if it is focusable itself) to views. If we are in touch mode, 4946 * only add views that are also focusable in touch mode. 4947 * 4948 * @param views Focusable views found so far 4949 * @param direction The direction of the focus 4950 */ 4951 public void addFocusables(ArrayList<View> views, int direction) { 4952 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4953 } 4954 4955 /** 4956 * Adds any focusable views that are descendants of this view (possibly 4957 * including this view if it is focusable itself) to views. This method 4958 * adds all focusable views regardless if we are in touch mode or 4959 * only views focusable in touch mode if we are in touch mode depending on 4960 * the focusable mode paramater. 4961 * 4962 * @param views Focusable views found so far or null if all we are interested is 4963 * the number of focusables. 4964 * @param direction The direction of the focus. 4965 * @param focusableMode The type of focusables to be added. 4966 * 4967 * @see #FOCUSABLES_ALL 4968 * @see #FOCUSABLES_TOUCH_MODE 4969 */ 4970 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4971 if (!isFocusable()) { 4972 return; 4973 } 4974 4975 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4976 isInTouchMode() && !isFocusableInTouchMode()) { 4977 return; 4978 } 4979 4980 if (views != null) { 4981 views.add(this); 4982 } 4983 } 4984 4985 /** 4986 * Finds the Views that contain given text. The containment is case insensitive. 4987 * As View's text is considered any text content that View renders. 4988 * 4989 * @param outViews The output list of matching Views. 4990 * @param text The text to match against. 4991 */ 4992 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 4993 } 4994 4995 /** 4996 * Find and return all touchable views that are descendants of this view, 4997 * possibly including this view if it is touchable itself. 4998 * 4999 * @return A list of touchable views 5000 */ 5001 public ArrayList<View> getTouchables() { 5002 ArrayList<View> result = new ArrayList<View>(); 5003 addTouchables(result); 5004 return result; 5005 } 5006 5007 /** 5008 * Add any touchable views that are descendants of this view (possibly 5009 * including this view if it is touchable itself) to views. 5010 * 5011 * @param views Touchable views found so far 5012 */ 5013 public void addTouchables(ArrayList<View> views) { 5014 final int viewFlags = mViewFlags; 5015 5016 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5017 && (viewFlags & ENABLED_MASK) == ENABLED) { 5018 views.add(this); 5019 } 5020 } 5021 5022 /** 5023 * Call this to try to give focus to a specific view or to one of its 5024 * descendants. 5025 * 5026 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5027 * false), or if it is focusable and it is not focusable in touch mode 5028 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5029 * 5030 * See also {@link #focusSearch(int)}, which is what you call to say that you 5031 * have focus, and you want your parent to look for the next one. 5032 * 5033 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 5034 * {@link #FOCUS_DOWN} and <code>null</code>. 5035 * 5036 * @return Whether this view or one of its descendants actually took focus. 5037 */ 5038 public final boolean requestFocus() { 5039 return requestFocus(View.FOCUS_DOWN); 5040 } 5041 5042 5043 /** 5044 * Call this to try to give focus to a specific view or to one of its 5045 * descendants and give it a hint about what direction focus is heading. 5046 * 5047 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5048 * false), or if it is focusable and it is not focusable in touch mode 5049 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5050 * 5051 * See also {@link #focusSearch(int)}, which is what you call to say that you 5052 * have focus, and you want your parent to look for the next one. 5053 * 5054 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 5055 * <code>null</code> set for the previously focused rectangle. 5056 * 5057 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5058 * @return Whether this view or one of its descendants actually took focus. 5059 */ 5060 public final boolean requestFocus(int direction) { 5061 return requestFocus(direction, null); 5062 } 5063 5064 /** 5065 * Call this to try to give focus to a specific view or to one of its descendants 5066 * and give it hints about the direction and a specific rectangle that the focus 5067 * is coming from. The rectangle can help give larger views a finer grained hint 5068 * about where focus is coming from, and therefore, where to show selection, or 5069 * forward focus change internally. 5070 * 5071 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5072 * false), or if it is focusable and it is not focusable in touch mode 5073 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5074 * 5075 * A View will not take focus if it is not visible. 5076 * 5077 * A View will not take focus if one of its parents has 5078 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 5079 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 5080 * 5081 * See also {@link #focusSearch(int)}, which is what you call to say that you 5082 * have focus, and you want your parent to look for the next one. 5083 * 5084 * You may wish to override this method if your custom {@link View} has an internal 5085 * {@link View} that it wishes to forward the request to. 5086 * 5087 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5088 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 5089 * to give a finer grained hint about where focus is coming from. May be null 5090 * if there is no hint. 5091 * @return Whether this view or one of its descendants actually took focus. 5092 */ 5093 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 5094 // need to be focusable 5095 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 5096 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5097 return false; 5098 } 5099 5100 // need to be focusable in touch mode if in touch mode 5101 if (isInTouchMode() && 5102 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 5103 return false; 5104 } 5105 5106 // need to not have any parents blocking us 5107 if (hasAncestorThatBlocksDescendantFocus()) { 5108 return false; 5109 } 5110 5111 handleFocusGainInternal(direction, previouslyFocusedRect); 5112 return true; 5113 } 5114 5115 /** Gets the ViewAncestor, or null if not attached. */ 5116 /*package*/ ViewRootImpl getViewRootImpl() { 5117 View root = getRootView(); 5118 return root != null ? (ViewRootImpl)root.getParent() : null; 5119 } 5120 5121 /** 5122 * Call this to try to give focus to a specific view or to one of its descendants. This is a 5123 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 5124 * touch mode to request focus when they are touched. 5125 * 5126 * @return Whether this view or one of its descendants actually took focus. 5127 * 5128 * @see #isInTouchMode() 5129 * 5130 */ 5131 public final boolean requestFocusFromTouch() { 5132 // Leave touch mode if we need to 5133 if (isInTouchMode()) { 5134 ViewRootImpl viewRoot = getViewRootImpl(); 5135 if (viewRoot != null) { 5136 viewRoot.ensureTouchMode(false); 5137 } 5138 } 5139 return requestFocus(View.FOCUS_DOWN); 5140 } 5141 5142 /** 5143 * @return Whether any ancestor of this view blocks descendant focus. 5144 */ 5145 private boolean hasAncestorThatBlocksDescendantFocus() { 5146 ViewParent ancestor = mParent; 5147 while (ancestor instanceof ViewGroup) { 5148 final ViewGroup vgAncestor = (ViewGroup) ancestor; 5149 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 5150 return true; 5151 } else { 5152 ancestor = vgAncestor.getParent(); 5153 } 5154 } 5155 return false; 5156 } 5157 5158 /** 5159 * @hide 5160 */ 5161 public void dispatchStartTemporaryDetach() { 5162 onStartTemporaryDetach(); 5163 } 5164 5165 /** 5166 * This is called when a container is going to temporarily detach a child, with 5167 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 5168 * It will either be followed by {@link #onFinishTemporaryDetach()} or 5169 * {@link #onDetachedFromWindow()} when the container is done. 5170 */ 5171 public void onStartTemporaryDetach() { 5172 removeUnsetPressCallback(); 5173 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 5174 } 5175 5176 /** 5177 * @hide 5178 */ 5179 public void dispatchFinishTemporaryDetach() { 5180 onFinishTemporaryDetach(); 5181 } 5182 5183 /** 5184 * Called after {@link #onStartTemporaryDetach} when the container is done 5185 * changing the view. 5186 */ 5187 public void onFinishTemporaryDetach() { 5188 } 5189 5190 /** 5191 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 5192 * for this view's window. Returns null if the view is not currently attached 5193 * to the window. Normally you will not need to use this directly, but 5194 * just use the standard high-level event callbacks like 5195 * {@link #onKeyDown(int, KeyEvent)}. 5196 */ 5197 public KeyEvent.DispatcherState getKeyDispatcherState() { 5198 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 5199 } 5200 5201 /** 5202 * Dispatch a key event before it is processed by any input method 5203 * associated with the view hierarchy. This can be used to intercept 5204 * key events in special situations before the IME consumes them; a 5205 * typical example would be handling the BACK key to update the application's 5206 * UI instead of allowing the IME to see it and close itself. 5207 * 5208 * @param event The key event to be dispatched. 5209 * @return True if the event was handled, false otherwise. 5210 */ 5211 public boolean dispatchKeyEventPreIme(KeyEvent event) { 5212 return onKeyPreIme(event.getKeyCode(), event); 5213 } 5214 5215 /** 5216 * Dispatch a key event to the next view on the focus path. This path runs 5217 * from the top of the view tree down to the currently focused view. If this 5218 * view has focus, it will dispatch to itself. Otherwise it will dispatch 5219 * the next node down the focus path. This method also fires any key 5220 * listeners. 5221 * 5222 * @param event The key event to be dispatched. 5223 * @return True if the event was handled, false otherwise. 5224 */ 5225 public boolean dispatchKeyEvent(KeyEvent event) { 5226 if (mInputEventConsistencyVerifier != null) { 5227 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 5228 } 5229 5230 // Give any attached key listener a first crack at the event. 5231 //noinspection SimplifiableIfStatement 5232 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5233 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 5234 return true; 5235 } 5236 5237 if (event.dispatch(this, mAttachInfo != null 5238 ? mAttachInfo.mKeyDispatchState : null, this)) { 5239 return true; 5240 } 5241 5242 if (mInputEventConsistencyVerifier != null) { 5243 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5244 } 5245 return false; 5246 } 5247 5248 /** 5249 * Dispatches a key shortcut event. 5250 * 5251 * @param event The key event to be dispatched. 5252 * @return True if the event was handled by the view, false otherwise. 5253 */ 5254 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5255 return onKeyShortcut(event.getKeyCode(), event); 5256 } 5257 5258 /** 5259 * Pass the touch screen motion event down to the target view, or this 5260 * view if it is the target. 5261 * 5262 * @param event The motion event to be dispatched. 5263 * @return True if the event was handled by the view, false otherwise. 5264 */ 5265 public boolean dispatchTouchEvent(MotionEvent event) { 5266 if (mInputEventConsistencyVerifier != null) { 5267 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5268 } 5269 5270 if (onFilterTouchEventForSecurity(event)) { 5271 //noinspection SimplifiableIfStatement 5272 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 5273 mOnTouchListener.onTouch(this, event)) { 5274 return true; 5275 } 5276 5277 if (onTouchEvent(event)) { 5278 return true; 5279 } 5280 } 5281 5282 if (mInputEventConsistencyVerifier != null) { 5283 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5284 } 5285 return false; 5286 } 5287 5288 /** 5289 * Filter the touch event to apply security policies. 5290 * 5291 * @param event The motion event to be filtered. 5292 * @return True if the event should be dispatched, false if the event should be dropped. 5293 * 5294 * @see #getFilterTouchesWhenObscured 5295 */ 5296 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5297 //noinspection RedundantIfStatement 5298 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5299 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5300 // Window is obscured, drop this touch. 5301 return false; 5302 } 5303 return true; 5304 } 5305 5306 /** 5307 * Pass a trackball motion event down to the focused view. 5308 * 5309 * @param event The motion event to be dispatched. 5310 * @return True if the event was handled by the view, false otherwise. 5311 */ 5312 public boolean dispatchTrackballEvent(MotionEvent event) { 5313 if (mInputEventConsistencyVerifier != null) { 5314 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5315 } 5316 5317 return onTrackballEvent(event); 5318 } 5319 5320 /** 5321 * Dispatch a generic motion event. 5322 * <p> 5323 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5324 * are delivered to the view under the pointer. All other generic motion events are 5325 * delivered to the focused view. Hover events are handled specially and are delivered 5326 * to {@link #onHoverEvent(MotionEvent)}. 5327 * </p> 5328 * 5329 * @param event The motion event to be dispatched. 5330 * @return True if the event was handled by the view, false otherwise. 5331 */ 5332 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5333 if (mInputEventConsistencyVerifier != null) { 5334 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5335 } 5336 5337 final int source = event.getSource(); 5338 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5339 final int action = event.getAction(); 5340 if (action == MotionEvent.ACTION_HOVER_ENTER 5341 || action == MotionEvent.ACTION_HOVER_MOVE 5342 || action == MotionEvent.ACTION_HOVER_EXIT) { 5343 if (dispatchHoverEvent(event)) { 5344 return true; 5345 } 5346 } else if (dispatchGenericPointerEvent(event)) { 5347 return true; 5348 } 5349 } else if (dispatchGenericFocusedEvent(event)) { 5350 return true; 5351 } 5352 5353 if (dispatchGenericMotionEventInternal(event)) { 5354 return true; 5355 } 5356 5357 if (mInputEventConsistencyVerifier != null) { 5358 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5359 } 5360 return false; 5361 } 5362 5363 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 5364 //noinspection SimplifiableIfStatement 5365 if (mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5366 && mOnGenericMotionListener.onGenericMotion(this, event)) { 5367 return true; 5368 } 5369 5370 if (onGenericMotionEvent(event)) { 5371 return true; 5372 } 5373 5374 if (mInputEventConsistencyVerifier != null) { 5375 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5376 } 5377 return false; 5378 } 5379 5380 /** 5381 * Dispatch a hover event. 5382 * <p> 5383 * Do not call this method directly. 5384 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5385 * </p> 5386 * 5387 * @param event The motion event to be dispatched. 5388 * @return True if the event was handled by the view, false otherwise. 5389 */ 5390 protected boolean dispatchHoverEvent(MotionEvent event) { 5391 //noinspection SimplifiableIfStatement 5392 if (mOnHoverListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5393 && mOnHoverListener.onHover(this, event)) { 5394 return true; 5395 } 5396 5397 return onHoverEvent(event); 5398 } 5399 5400 /** 5401 * Returns true if the view has a child to which it has recently sent 5402 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 5403 * it does not have a hovered child, then it must be the innermost hovered view. 5404 * @hide 5405 */ 5406 protected boolean hasHoveredChild() { 5407 return false; 5408 } 5409 5410 /** 5411 * Dispatch a generic motion event to the view under the first pointer. 5412 * <p> 5413 * Do not call this method directly. 5414 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5415 * </p> 5416 * 5417 * @param event The motion event to be dispatched. 5418 * @return True if the event was handled by the view, false otherwise. 5419 */ 5420 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5421 return false; 5422 } 5423 5424 /** 5425 * Dispatch a generic motion event to the currently focused view. 5426 * <p> 5427 * Do not call this method directly. 5428 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5429 * </p> 5430 * 5431 * @param event The motion event to be dispatched. 5432 * @return True if the event was handled by the view, false otherwise. 5433 */ 5434 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5435 return false; 5436 } 5437 5438 /** 5439 * Dispatch a pointer event. 5440 * <p> 5441 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5442 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5443 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5444 * and should not be expected to handle other pointing device features. 5445 * </p> 5446 * 5447 * @param event The motion event to be dispatched. 5448 * @return True if the event was handled by the view, false otherwise. 5449 * @hide 5450 */ 5451 public final boolean dispatchPointerEvent(MotionEvent event) { 5452 if (event.isTouchEvent()) { 5453 return dispatchTouchEvent(event); 5454 } else { 5455 return dispatchGenericMotionEvent(event); 5456 } 5457 } 5458 5459 /** 5460 * Called when the window containing this view gains or loses window focus. 5461 * ViewGroups should override to route to their children. 5462 * 5463 * @param hasFocus True if the window containing this view now has focus, 5464 * false otherwise. 5465 */ 5466 public void dispatchWindowFocusChanged(boolean hasFocus) { 5467 onWindowFocusChanged(hasFocus); 5468 } 5469 5470 /** 5471 * Called when the window containing this view gains or loses focus. Note 5472 * that this is separate from view focus: to receive key events, both 5473 * your view and its window must have focus. If a window is displayed 5474 * on top of yours that takes input focus, then your own window will lose 5475 * focus but the view focus will remain unchanged. 5476 * 5477 * @param hasWindowFocus True if the window containing this view now has 5478 * focus, false otherwise. 5479 */ 5480 public void onWindowFocusChanged(boolean hasWindowFocus) { 5481 InputMethodManager imm = InputMethodManager.peekInstance(); 5482 if (!hasWindowFocus) { 5483 if (isPressed()) { 5484 setPressed(false); 5485 } 5486 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5487 imm.focusOut(this); 5488 } 5489 removeLongPressCallback(); 5490 removeTapCallback(); 5491 onFocusLost(); 5492 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5493 imm.focusIn(this); 5494 } 5495 refreshDrawableState(); 5496 } 5497 5498 /** 5499 * Returns true if this view is in a window that currently has window focus. 5500 * Note that this is not the same as the view itself having focus. 5501 * 5502 * @return True if this view is in a window that currently has window focus. 5503 */ 5504 public boolean hasWindowFocus() { 5505 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5506 } 5507 5508 /** 5509 * Dispatch a view visibility change down the view hierarchy. 5510 * ViewGroups should override to route to their children. 5511 * @param changedView The view whose visibility changed. Could be 'this' or 5512 * an ancestor view. 5513 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5514 * {@link #INVISIBLE} or {@link #GONE}. 5515 */ 5516 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5517 onVisibilityChanged(changedView, visibility); 5518 } 5519 5520 /** 5521 * Called when the visibility of the view or an ancestor of the view is changed. 5522 * @param changedView The view whose visibility changed. Could be 'this' or 5523 * an ancestor view. 5524 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5525 * {@link #INVISIBLE} or {@link #GONE}. 5526 */ 5527 protected void onVisibilityChanged(View changedView, int visibility) { 5528 if (visibility == VISIBLE) { 5529 if (mAttachInfo != null) { 5530 initialAwakenScrollBars(); 5531 } else { 5532 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5533 } 5534 } 5535 } 5536 5537 /** 5538 * Dispatch a hint about whether this view is displayed. For instance, when 5539 * a View moves out of the screen, it might receives a display hint indicating 5540 * the view is not displayed. Applications should not <em>rely</em> on this hint 5541 * as there is no guarantee that they will receive one. 5542 * 5543 * @param hint A hint about whether or not this view is displayed: 5544 * {@link #VISIBLE} or {@link #INVISIBLE}. 5545 */ 5546 public void dispatchDisplayHint(int hint) { 5547 onDisplayHint(hint); 5548 } 5549 5550 /** 5551 * Gives this view a hint about whether is displayed or not. For instance, when 5552 * a View moves out of the screen, it might receives a display hint indicating 5553 * the view is not displayed. Applications should not <em>rely</em> on this hint 5554 * as there is no guarantee that they will receive one. 5555 * 5556 * @param hint A hint about whether or not this view is displayed: 5557 * {@link #VISIBLE} or {@link #INVISIBLE}. 5558 */ 5559 protected void onDisplayHint(int hint) { 5560 } 5561 5562 /** 5563 * Dispatch a window visibility change down the view hierarchy. 5564 * ViewGroups should override to route to their children. 5565 * 5566 * @param visibility The new visibility of the window. 5567 * 5568 * @see #onWindowVisibilityChanged(int) 5569 */ 5570 public void dispatchWindowVisibilityChanged(int visibility) { 5571 onWindowVisibilityChanged(visibility); 5572 } 5573 5574 /** 5575 * Called when the window containing has change its visibility 5576 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5577 * that this tells you whether or not your window is being made visible 5578 * to the window manager; this does <em>not</em> tell you whether or not 5579 * your window is obscured by other windows on the screen, even if it 5580 * is itself visible. 5581 * 5582 * @param visibility The new visibility of the window. 5583 */ 5584 protected void onWindowVisibilityChanged(int visibility) { 5585 if (visibility == VISIBLE) { 5586 initialAwakenScrollBars(); 5587 } 5588 } 5589 5590 /** 5591 * Returns the current visibility of the window this view is attached to 5592 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 5593 * 5594 * @return Returns the current visibility of the view's window. 5595 */ 5596 public int getWindowVisibility() { 5597 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 5598 } 5599 5600 /** 5601 * Retrieve the overall visible display size in which the window this view is 5602 * attached to has been positioned in. This takes into account screen 5603 * decorations above the window, for both cases where the window itself 5604 * is being position inside of them or the window is being placed under 5605 * then and covered insets are used for the window to position its content 5606 * inside. In effect, this tells you the available area where content can 5607 * be placed and remain visible to users. 5608 * 5609 * <p>This function requires an IPC back to the window manager to retrieve 5610 * the requested information, so should not be used in performance critical 5611 * code like drawing. 5612 * 5613 * @param outRect Filled in with the visible display frame. If the view 5614 * is not attached to a window, this is simply the raw display size. 5615 */ 5616 public void getWindowVisibleDisplayFrame(Rect outRect) { 5617 if (mAttachInfo != null) { 5618 try { 5619 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 5620 } catch (RemoteException e) { 5621 return; 5622 } 5623 // XXX This is really broken, and probably all needs to be done 5624 // in the window manager, and we need to know more about whether 5625 // we want the area behind or in front of the IME. 5626 final Rect insets = mAttachInfo.mVisibleInsets; 5627 outRect.left += insets.left; 5628 outRect.top += insets.top; 5629 outRect.right -= insets.right; 5630 outRect.bottom -= insets.bottom; 5631 return; 5632 } 5633 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 5634 d.getRectSize(outRect); 5635 } 5636 5637 /** 5638 * Dispatch a notification about a resource configuration change down 5639 * the view hierarchy. 5640 * ViewGroups should override to route to their children. 5641 * 5642 * @param newConfig The new resource configuration. 5643 * 5644 * @see #onConfigurationChanged(android.content.res.Configuration) 5645 */ 5646 public void dispatchConfigurationChanged(Configuration newConfig) { 5647 onConfigurationChanged(newConfig); 5648 } 5649 5650 /** 5651 * Called when the current configuration of the resources being used 5652 * by the application have changed. You can use this to decide when 5653 * to reload resources that can changed based on orientation and other 5654 * configuration characterstics. You only need to use this if you are 5655 * not relying on the normal {@link android.app.Activity} mechanism of 5656 * recreating the activity instance upon a configuration change. 5657 * 5658 * @param newConfig The new resource configuration. 5659 */ 5660 protected void onConfigurationChanged(Configuration newConfig) { 5661 } 5662 5663 /** 5664 * Private function to aggregate all per-view attributes in to the view 5665 * root. 5666 */ 5667 void dispatchCollectViewAttributes(int visibility) { 5668 performCollectViewAttributes(visibility); 5669 } 5670 5671 void performCollectViewAttributes(int visibility) { 5672 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 5673 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 5674 mAttachInfo.mKeepScreenOn = true; 5675 } 5676 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 5677 if (mOnSystemUiVisibilityChangeListener != null) { 5678 mAttachInfo.mHasSystemUiListeners = true; 5679 } 5680 } 5681 } 5682 5683 void needGlobalAttributesUpdate(boolean force) { 5684 final AttachInfo ai = mAttachInfo; 5685 if (ai != null) { 5686 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 5687 || ai.mHasSystemUiListeners) { 5688 ai.mRecomputeGlobalAttributes = true; 5689 } 5690 } 5691 } 5692 5693 /** 5694 * Returns whether the device is currently in touch mode. Touch mode is entered 5695 * once the user begins interacting with the device by touch, and affects various 5696 * things like whether focus is always visible to the user. 5697 * 5698 * @return Whether the device is in touch mode. 5699 */ 5700 @ViewDebug.ExportedProperty 5701 public boolean isInTouchMode() { 5702 if (mAttachInfo != null) { 5703 return mAttachInfo.mInTouchMode; 5704 } else { 5705 return ViewRootImpl.isInTouchMode(); 5706 } 5707 } 5708 5709 /** 5710 * Returns the context the view is running in, through which it can 5711 * access the current theme, resources, etc. 5712 * 5713 * @return The view's Context. 5714 */ 5715 @ViewDebug.CapturedViewProperty 5716 public final Context getContext() { 5717 return mContext; 5718 } 5719 5720 /** 5721 * Handle a key event before it is processed by any input method 5722 * associated with the view hierarchy. This can be used to intercept 5723 * key events in special situations before the IME consumes them; a 5724 * typical example would be handling the BACK key to update the application's 5725 * UI instead of allowing the IME to see it and close itself. 5726 * 5727 * @param keyCode The value in event.getKeyCode(). 5728 * @param event Description of the key event. 5729 * @return If you handled the event, return true. If you want to allow the 5730 * event to be handled by the next receiver, return false. 5731 */ 5732 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 5733 return false; 5734 } 5735 5736 /** 5737 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 5738 * KeyEvent.Callback.onKeyDown()}: perform press of the view 5739 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 5740 * is released, if the view is enabled and clickable. 5741 * 5742 * @param keyCode A key code that represents the button pressed, from 5743 * {@link android.view.KeyEvent}. 5744 * @param event The KeyEvent object that defines the button action. 5745 */ 5746 public boolean onKeyDown(int keyCode, KeyEvent event) { 5747 boolean result = false; 5748 5749 switch (keyCode) { 5750 case KeyEvent.KEYCODE_DPAD_CENTER: 5751 case KeyEvent.KEYCODE_ENTER: { 5752 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5753 return true; 5754 } 5755 // Long clickable items don't necessarily have to be clickable 5756 if (((mViewFlags & CLICKABLE) == CLICKABLE || 5757 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 5758 (event.getRepeatCount() == 0)) { 5759 setPressed(true); 5760 checkForLongClick(0); 5761 return true; 5762 } 5763 break; 5764 } 5765 } 5766 return result; 5767 } 5768 5769 /** 5770 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 5771 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 5772 * the event). 5773 */ 5774 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 5775 return false; 5776 } 5777 5778 /** 5779 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 5780 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 5781 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 5782 * {@link KeyEvent#KEYCODE_ENTER} is released. 5783 * 5784 * @param keyCode A key code that represents the button pressed, from 5785 * {@link android.view.KeyEvent}. 5786 * @param event The KeyEvent object that defines the button action. 5787 */ 5788 public boolean onKeyUp(int keyCode, KeyEvent event) { 5789 boolean result = false; 5790 5791 switch (keyCode) { 5792 case KeyEvent.KEYCODE_DPAD_CENTER: 5793 case KeyEvent.KEYCODE_ENTER: { 5794 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5795 return true; 5796 } 5797 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 5798 setPressed(false); 5799 5800 if (!mHasPerformedLongPress) { 5801 // This is a tap, so remove the longpress check 5802 removeLongPressCallback(); 5803 5804 result = performClick(); 5805 } 5806 } 5807 break; 5808 } 5809 } 5810 return result; 5811 } 5812 5813 /** 5814 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 5815 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 5816 * the event). 5817 * 5818 * @param keyCode A key code that represents the button pressed, from 5819 * {@link android.view.KeyEvent}. 5820 * @param repeatCount The number of times the action was made. 5821 * @param event The KeyEvent object that defines the button action. 5822 */ 5823 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 5824 return false; 5825 } 5826 5827 /** 5828 * Called on the focused view when a key shortcut event is not handled. 5829 * Override this method to implement local key shortcuts for the View. 5830 * Key shortcuts can also be implemented by setting the 5831 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 5832 * 5833 * @param keyCode The value in event.getKeyCode(). 5834 * @param event Description of the key event. 5835 * @return If you handled the event, return true. If you want to allow the 5836 * event to be handled by the next receiver, return false. 5837 */ 5838 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 5839 return false; 5840 } 5841 5842 /** 5843 * Check whether the called view is a text editor, in which case it 5844 * would make sense to automatically display a soft input window for 5845 * it. Subclasses should override this if they implement 5846 * {@link #onCreateInputConnection(EditorInfo)} to return true if 5847 * a call on that method would return a non-null InputConnection, and 5848 * they are really a first-class editor that the user would normally 5849 * start typing on when the go into a window containing your view. 5850 * 5851 * <p>The default implementation always returns false. This does 5852 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 5853 * will not be called or the user can not otherwise perform edits on your 5854 * view; it is just a hint to the system that this is not the primary 5855 * purpose of this view. 5856 * 5857 * @return Returns true if this view is a text editor, else false. 5858 */ 5859 public boolean onCheckIsTextEditor() { 5860 return false; 5861 } 5862 5863 /** 5864 * Create a new InputConnection for an InputMethod to interact 5865 * with the view. The default implementation returns null, since it doesn't 5866 * support input methods. You can override this to implement such support. 5867 * This is only needed for views that take focus and text input. 5868 * 5869 * <p>When implementing this, you probably also want to implement 5870 * {@link #onCheckIsTextEditor()} to indicate you will return a 5871 * non-null InputConnection. 5872 * 5873 * @param outAttrs Fill in with attribute information about the connection. 5874 */ 5875 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 5876 return null; 5877 } 5878 5879 /** 5880 * Called by the {@link android.view.inputmethod.InputMethodManager} 5881 * when a view who is not the current 5882 * input connection target is trying to make a call on the manager. The 5883 * default implementation returns false; you can override this to return 5884 * true for certain views if you are performing InputConnection proxying 5885 * to them. 5886 * @param view The View that is making the InputMethodManager call. 5887 * @return Return true to allow the call, false to reject. 5888 */ 5889 public boolean checkInputConnectionProxy(View view) { 5890 return false; 5891 } 5892 5893 /** 5894 * Show the context menu for this view. It is not safe to hold on to the 5895 * menu after returning from this method. 5896 * 5897 * You should normally not overload this method. Overload 5898 * {@link #onCreateContextMenu(ContextMenu)} or define an 5899 * {@link OnCreateContextMenuListener} to add items to the context menu. 5900 * 5901 * @param menu The context menu to populate 5902 */ 5903 public void createContextMenu(ContextMenu menu) { 5904 ContextMenuInfo menuInfo = getContextMenuInfo(); 5905 5906 // Sets the current menu info so all items added to menu will have 5907 // my extra info set. 5908 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 5909 5910 onCreateContextMenu(menu); 5911 if (mOnCreateContextMenuListener != null) { 5912 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 5913 } 5914 5915 // Clear the extra information so subsequent items that aren't mine don't 5916 // have my extra info. 5917 ((MenuBuilder)menu).setCurrentMenuInfo(null); 5918 5919 if (mParent != null) { 5920 mParent.createContextMenu(menu); 5921 } 5922 } 5923 5924 /** 5925 * Views should implement this if they have extra information to associate 5926 * with the context menu. The return result is supplied as a parameter to 5927 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 5928 * callback. 5929 * 5930 * @return Extra information about the item for which the context menu 5931 * should be shown. This information will vary across different 5932 * subclasses of View. 5933 */ 5934 protected ContextMenuInfo getContextMenuInfo() { 5935 return null; 5936 } 5937 5938 /** 5939 * Views should implement this if the view itself is going to add items to 5940 * the context menu. 5941 * 5942 * @param menu the context menu to populate 5943 */ 5944 protected void onCreateContextMenu(ContextMenu menu) { 5945 } 5946 5947 /** 5948 * Implement this method to handle trackball motion events. The 5949 * <em>relative</em> movement of the trackball since the last event 5950 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 5951 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 5952 * that a movement of 1 corresponds to the user pressing one DPAD key (so 5953 * they will often be fractional values, representing the more fine-grained 5954 * movement information available from a trackball). 5955 * 5956 * @param event The motion event. 5957 * @return True if the event was handled, false otherwise. 5958 */ 5959 public boolean onTrackballEvent(MotionEvent event) { 5960 return false; 5961 } 5962 5963 /** 5964 * Implement this method to handle generic motion events. 5965 * <p> 5966 * Generic motion events describe joystick movements, mouse hovers, track pad 5967 * touches, scroll wheel movements and other input events. The 5968 * {@link MotionEvent#getSource() source} of the motion event specifies 5969 * the class of input that was received. Implementations of this method 5970 * must examine the bits in the source before processing the event. 5971 * The following code example shows how this is done. 5972 * </p><p> 5973 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5974 * are delivered to the view under the pointer. All other generic motion events are 5975 * delivered to the focused view. 5976 * </p> 5977 * <code> 5978 * public boolean onGenericMotionEvent(MotionEvent event) { 5979 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 5980 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 5981 * // process the joystick movement... 5982 * return true; 5983 * } 5984 * } 5985 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5986 * switch (event.getAction()) { 5987 * case MotionEvent.ACTION_HOVER_MOVE: 5988 * // process the mouse hover movement... 5989 * return true; 5990 * case MotionEvent.ACTION_SCROLL: 5991 * // process the scroll wheel movement... 5992 * return true; 5993 * } 5994 * } 5995 * return super.onGenericMotionEvent(event); 5996 * } 5997 * </code> 5998 * 5999 * @param event The generic motion event being processed. 6000 * @return True if the event was handled, false otherwise. 6001 */ 6002 public boolean onGenericMotionEvent(MotionEvent event) { 6003 return false; 6004 } 6005 6006 /** 6007 * Implement this method to handle hover events. 6008 * <p> 6009 * This method is called whenever a pointer is hovering into, over, or out of the 6010 * bounds of a view and the view is not currently being touched. 6011 * Hover events are represented as pointer events with action 6012 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 6013 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 6014 * </p> 6015 * <ul> 6016 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 6017 * when the pointer enters the bounds of the view.</li> 6018 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 6019 * when the pointer has already entered the bounds of the view and has moved.</li> 6020 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 6021 * when the pointer has exited the bounds of the view or when the pointer is 6022 * about to go down due to a button click, tap, or similar user action that 6023 * causes the view to be touched.</li> 6024 * </ul> 6025 * <p> 6026 * The view should implement this method to return true to indicate that it is 6027 * handling the hover event, such as by changing its drawable state. 6028 * </p><p> 6029 * The default implementation calls {@link #setHovered} to update the hovered state 6030 * of the view when a hover enter or hover exit event is received, if the view 6031 * is enabled and is clickable. The default implementation also sends hover 6032 * accessibility events. 6033 * </p> 6034 * 6035 * @param event The motion event that describes the hover. 6036 * @return True if the view handled the hover event. 6037 * 6038 * @see #isHovered 6039 * @see #setHovered 6040 * @see #onHoverChanged 6041 */ 6042 public boolean onHoverEvent(MotionEvent event) { 6043 // The root view may receive hover (or touch) events that are outside the bounds of 6044 // the window. This code ensures that we only send accessibility events for 6045 // hovers that are actually within the bounds of the root view. 6046 final int action = event.getAction(); 6047 if (!mSendingHoverAccessibilityEvents) { 6048 if ((action == MotionEvent.ACTION_HOVER_ENTER 6049 || action == MotionEvent.ACTION_HOVER_MOVE) 6050 && !hasHoveredChild() 6051 && pointInView(event.getX(), event.getY())) { 6052 mSendingHoverAccessibilityEvents = true; 6053 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 6054 } 6055 } else { 6056 if (action == MotionEvent.ACTION_HOVER_EXIT 6057 || (action == MotionEvent.ACTION_HOVER_MOVE 6058 && !pointInView(event.getX(), event.getY()))) { 6059 mSendingHoverAccessibilityEvents = false; 6060 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 6061 } 6062 } 6063 6064 if (isHoverable()) { 6065 switch (action) { 6066 case MotionEvent.ACTION_HOVER_ENTER: 6067 setHovered(true); 6068 break; 6069 case MotionEvent.ACTION_HOVER_EXIT: 6070 setHovered(false); 6071 break; 6072 } 6073 6074 // Dispatch the event to onGenericMotionEvent before returning true. 6075 // This is to provide compatibility with existing applications that 6076 // handled HOVER_MOVE events in onGenericMotionEvent and that would 6077 // break because of the new default handling for hoverable views 6078 // in onHoverEvent. 6079 // Note that onGenericMotionEvent will be called by default when 6080 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 6081 dispatchGenericMotionEventInternal(event); 6082 return true; 6083 } 6084 return false; 6085 } 6086 6087 /** 6088 * Returns true if the view should handle {@link #onHoverEvent} 6089 * by calling {@link #setHovered} to change its hovered state. 6090 * 6091 * @return True if the view is hoverable. 6092 */ 6093 private boolean isHoverable() { 6094 final int viewFlags = mViewFlags; 6095 //noinspection SimplifiableIfStatement 6096 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6097 return false; 6098 } 6099 6100 return (viewFlags & CLICKABLE) == CLICKABLE 6101 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6102 } 6103 6104 /** 6105 * Returns true if the view is currently hovered. 6106 * 6107 * @return True if the view is currently hovered. 6108 * 6109 * @see #setHovered 6110 * @see #onHoverChanged 6111 */ 6112 @ViewDebug.ExportedProperty 6113 public boolean isHovered() { 6114 return (mPrivateFlags & HOVERED) != 0; 6115 } 6116 6117 /** 6118 * Sets whether the view is currently hovered. 6119 * <p> 6120 * Calling this method also changes the drawable state of the view. This 6121 * enables the view to react to hover by using different drawable resources 6122 * to change its appearance. 6123 * </p><p> 6124 * The {@link #onHoverChanged} method is called when the hovered state changes. 6125 * </p> 6126 * 6127 * @param hovered True if the view is hovered. 6128 * 6129 * @see #isHovered 6130 * @see #onHoverChanged 6131 */ 6132 public void setHovered(boolean hovered) { 6133 if (hovered) { 6134 if ((mPrivateFlags & HOVERED) == 0) { 6135 mPrivateFlags |= HOVERED; 6136 refreshDrawableState(); 6137 onHoverChanged(true); 6138 } 6139 } else { 6140 if ((mPrivateFlags & HOVERED) != 0) { 6141 mPrivateFlags &= ~HOVERED; 6142 refreshDrawableState(); 6143 onHoverChanged(false); 6144 } 6145 } 6146 } 6147 6148 /** 6149 * Implement this method to handle hover state changes. 6150 * <p> 6151 * This method is called whenever the hover state changes as a result of a 6152 * call to {@link #setHovered}. 6153 * </p> 6154 * 6155 * @param hovered The current hover state, as returned by {@link #isHovered}. 6156 * 6157 * @see #isHovered 6158 * @see #setHovered 6159 */ 6160 public void onHoverChanged(boolean hovered) { 6161 } 6162 6163 /** 6164 * Implement this method to handle touch screen motion events. 6165 * 6166 * @param event The motion event. 6167 * @return True if the event was handled, false otherwise. 6168 */ 6169 public boolean onTouchEvent(MotionEvent event) { 6170 final int viewFlags = mViewFlags; 6171 6172 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6173 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 6174 mPrivateFlags &= ~PRESSED; 6175 refreshDrawableState(); 6176 } 6177 // A disabled view that is clickable still consumes the touch 6178 // events, it just doesn't respond to them. 6179 return (((viewFlags & CLICKABLE) == CLICKABLE || 6180 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 6181 } 6182 6183 if (mTouchDelegate != null) { 6184 if (mTouchDelegate.onTouchEvent(event)) { 6185 return true; 6186 } 6187 } 6188 6189 if (((viewFlags & CLICKABLE) == CLICKABLE || 6190 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 6191 switch (event.getAction()) { 6192 case MotionEvent.ACTION_UP: 6193 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 6194 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 6195 // take focus if we don't have it already and we should in 6196 // touch mode. 6197 boolean focusTaken = false; 6198 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 6199 focusTaken = requestFocus(); 6200 } 6201 6202 if (prepressed) { 6203 // The button is being released before we actually 6204 // showed it as pressed. Make it show the pressed 6205 // state now (before scheduling the click) to ensure 6206 // the user sees it. 6207 mPrivateFlags |= PRESSED; 6208 refreshDrawableState(); 6209 } 6210 6211 if (!mHasPerformedLongPress) { 6212 // This is a tap, so remove the longpress check 6213 removeLongPressCallback(); 6214 6215 // Only perform take click actions if we were in the pressed state 6216 if (!focusTaken) { 6217 // Use a Runnable and post this rather than calling 6218 // performClick directly. This lets other visual state 6219 // of the view update before click actions start. 6220 if (mPerformClick == null) { 6221 mPerformClick = new PerformClick(); 6222 } 6223 if (!post(mPerformClick)) { 6224 performClick(); 6225 } 6226 } 6227 } 6228 6229 if (mUnsetPressedState == null) { 6230 mUnsetPressedState = new UnsetPressedState(); 6231 } 6232 6233 if (prepressed) { 6234 postDelayed(mUnsetPressedState, 6235 ViewConfiguration.getPressedStateDuration()); 6236 } else if (!post(mUnsetPressedState)) { 6237 // If the post failed, unpress right now 6238 mUnsetPressedState.run(); 6239 } 6240 removeTapCallback(); 6241 } 6242 break; 6243 6244 case MotionEvent.ACTION_DOWN: 6245 mHasPerformedLongPress = false; 6246 6247 if (performButtonActionOnTouchDown(event)) { 6248 break; 6249 } 6250 6251 // Walk up the hierarchy to determine if we're inside a scrolling container. 6252 boolean isInScrollingContainer = isInScrollingContainer(); 6253 6254 // For views inside a scrolling container, delay the pressed feedback for 6255 // a short period in case this is a scroll. 6256 if (isInScrollingContainer) { 6257 mPrivateFlags |= PREPRESSED; 6258 if (mPendingCheckForTap == null) { 6259 mPendingCheckForTap = new CheckForTap(); 6260 } 6261 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 6262 } else { 6263 // Not inside a scrolling container, so show the feedback right away 6264 mPrivateFlags |= PRESSED; 6265 refreshDrawableState(); 6266 checkForLongClick(0); 6267 } 6268 break; 6269 6270 case MotionEvent.ACTION_CANCEL: 6271 mPrivateFlags &= ~PRESSED; 6272 refreshDrawableState(); 6273 removeTapCallback(); 6274 break; 6275 6276 case MotionEvent.ACTION_MOVE: 6277 final int x = (int) event.getX(); 6278 final int y = (int) event.getY(); 6279 6280 // Be lenient about moving outside of buttons 6281 if (!pointInView(x, y, mTouchSlop)) { 6282 // Outside button 6283 removeTapCallback(); 6284 if ((mPrivateFlags & PRESSED) != 0) { 6285 // Remove any future long press/tap checks 6286 removeLongPressCallback(); 6287 6288 // Need to switch from pressed to not pressed 6289 mPrivateFlags &= ~PRESSED; 6290 refreshDrawableState(); 6291 } 6292 } 6293 break; 6294 } 6295 return true; 6296 } 6297 6298 return false; 6299 } 6300 6301 /** 6302 * @hide 6303 */ 6304 public boolean isInScrollingContainer() { 6305 ViewParent p = getParent(); 6306 while (p != null && p instanceof ViewGroup) { 6307 if (((ViewGroup) p).shouldDelayChildPressedState()) { 6308 return true; 6309 } 6310 p = p.getParent(); 6311 } 6312 return false; 6313 } 6314 6315 /** 6316 * Remove the longpress detection timer. 6317 */ 6318 private void removeLongPressCallback() { 6319 if (mPendingCheckForLongPress != null) { 6320 removeCallbacks(mPendingCheckForLongPress); 6321 } 6322 } 6323 6324 /** 6325 * Remove the pending click action 6326 */ 6327 private void removePerformClickCallback() { 6328 if (mPerformClick != null) { 6329 removeCallbacks(mPerformClick); 6330 } 6331 } 6332 6333 /** 6334 * Remove the prepress detection timer. 6335 */ 6336 private void removeUnsetPressCallback() { 6337 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 6338 setPressed(false); 6339 removeCallbacks(mUnsetPressedState); 6340 } 6341 } 6342 6343 /** 6344 * Remove the tap detection timer. 6345 */ 6346 private void removeTapCallback() { 6347 if (mPendingCheckForTap != null) { 6348 mPrivateFlags &= ~PREPRESSED; 6349 removeCallbacks(mPendingCheckForTap); 6350 } 6351 } 6352 6353 /** 6354 * Cancels a pending long press. Your subclass can use this if you 6355 * want the context menu to come up if the user presses and holds 6356 * at the same place, but you don't want it to come up if they press 6357 * and then move around enough to cause scrolling. 6358 */ 6359 public void cancelLongPress() { 6360 removeLongPressCallback(); 6361 6362 /* 6363 * The prepressed state handled by the tap callback is a display 6364 * construct, but the tap callback will post a long press callback 6365 * less its own timeout. Remove it here. 6366 */ 6367 removeTapCallback(); 6368 } 6369 6370 /** 6371 * Remove the pending callback for sending a 6372 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 6373 */ 6374 private void removeSendViewScrolledAccessibilityEventCallback() { 6375 if (mSendViewScrolledAccessibilityEvent != null) { 6376 removeCallbacks(mSendViewScrolledAccessibilityEvent); 6377 } 6378 } 6379 6380 /** 6381 * Sets the TouchDelegate for this View. 6382 */ 6383 public void setTouchDelegate(TouchDelegate delegate) { 6384 mTouchDelegate = delegate; 6385 } 6386 6387 /** 6388 * Gets the TouchDelegate for this View. 6389 */ 6390 public TouchDelegate getTouchDelegate() { 6391 return mTouchDelegate; 6392 } 6393 6394 /** 6395 * Set flags controlling behavior of this view. 6396 * 6397 * @param flags Constant indicating the value which should be set 6398 * @param mask Constant indicating the bit range that should be changed 6399 */ 6400 void setFlags(int flags, int mask) { 6401 int old = mViewFlags; 6402 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6403 6404 int changed = mViewFlags ^ old; 6405 if (changed == 0) { 6406 return; 6407 } 6408 int privateFlags = mPrivateFlags; 6409 6410 /* Check if the FOCUSABLE bit has changed */ 6411 if (((changed & FOCUSABLE_MASK) != 0) && 6412 ((privateFlags & HAS_BOUNDS) !=0)) { 6413 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6414 && ((privateFlags & FOCUSED) != 0)) { 6415 /* Give up focus if we are no longer focusable */ 6416 clearFocus(); 6417 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6418 && ((privateFlags & FOCUSED) == 0)) { 6419 /* 6420 * Tell the view system that we are now available to take focus 6421 * if no one else already has it. 6422 */ 6423 if (mParent != null) mParent.focusableViewAvailable(this); 6424 } 6425 } 6426 6427 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6428 if ((changed & VISIBILITY_MASK) != 0) { 6429 /* 6430 * If this view is becoming visible, invalidate it in case it changed while 6431 * it was not visible. Marking it drawn ensures that the invalidation will 6432 * go through. 6433 */ 6434 mPrivateFlags |= DRAWN; 6435 invalidate(true); 6436 6437 needGlobalAttributesUpdate(true); 6438 6439 // a view becoming visible is worth notifying the parent 6440 // about in case nothing has focus. even if this specific view 6441 // isn't focusable, it may contain something that is, so let 6442 // the root view try to give this focus if nothing else does. 6443 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6444 mParent.focusableViewAvailable(this); 6445 } 6446 } 6447 } 6448 6449 /* Check if the GONE bit has changed */ 6450 if ((changed & GONE) != 0) { 6451 needGlobalAttributesUpdate(false); 6452 requestLayout(); 6453 6454 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6455 if (hasFocus()) clearFocus(); 6456 destroyDrawingCache(); 6457 if (mParent instanceof View) { 6458 // GONE views noop invalidation, so invalidate the parent 6459 ((View) mParent).invalidate(true); 6460 } 6461 // Mark the view drawn to ensure that it gets invalidated properly the next 6462 // time it is visible and gets invalidated 6463 mPrivateFlags |= DRAWN; 6464 } 6465 if (mAttachInfo != null) { 6466 mAttachInfo.mViewVisibilityChanged = true; 6467 } 6468 } 6469 6470 /* Check if the VISIBLE bit has changed */ 6471 if ((changed & INVISIBLE) != 0) { 6472 needGlobalAttributesUpdate(false); 6473 /* 6474 * If this view is becoming invisible, set the DRAWN flag so that 6475 * the next invalidate() will not be skipped. 6476 */ 6477 mPrivateFlags |= DRAWN; 6478 6479 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6480 // root view becoming invisible shouldn't clear focus 6481 if (getRootView() != this) { 6482 clearFocus(); 6483 } 6484 } 6485 if (mAttachInfo != null) { 6486 mAttachInfo.mViewVisibilityChanged = true; 6487 } 6488 } 6489 6490 if ((changed & VISIBILITY_MASK) != 0) { 6491 if (mParent instanceof ViewGroup) { 6492 ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6493 ((View) mParent).invalidate(true); 6494 } else if (mParent != null) { 6495 mParent.invalidateChild(this, null); 6496 } 6497 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6498 } 6499 6500 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6501 destroyDrawingCache(); 6502 } 6503 6504 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6505 destroyDrawingCache(); 6506 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6507 invalidateParentCaches(); 6508 } 6509 6510 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6511 destroyDrawingCache(); 6512 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6513 } 6514 6515 if ((changed & DRAW_MASK) != 0) { 6516 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6517 if (mBGDrawable != null) { 6518 mPrivateFlags &= ~SKIP_DRAW; 6519 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6520 } else { 6521 mPrivateFlags |= SKIP_DRAW; 6522 } 6523 } else { 6524 mPrivateFlags &= ~SKIP_DRAW; 6525 } 6526 requestLayout(); 6527 invalidate(true); 6528 } 6529 6530 if ((changed & KEEP_SCREEN_ON) != 0) { 6531 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6532 mParent.recomputeViewAttributes(this); 6533 } 6534 } 6535 6536 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6537 requestLayout(); 6538 } 6539 } 6540 6541 /** 6542 * Change the view's z order in the tree, so it's on top of other sibling 6543 * views 6544 */ 6545 public void bringToFront() { 6546 if (mParent != null) { 6547 mParent.bringChildToFront(this); 6548 } 6549 } 6550 6551 /** 6552 * This is called in response to an internal scroll in this view (i.e., the 6553 * view scrolled its own contents). This is typically as a result of 6554 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6555 * called. 6556 * 6557 * @param l Current horizontal scroll origin. 6558 * @param t Current vertical scroll origin. 6559 * @param oldl Previous horizontal scroll origin. 6560 * @param oldt Previous vertical scroll origin. 6561 */ 6562 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6563 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 6564 postSendViewScrolledAccessibilityEventCallback(); 6565 } 6566 6567 mBackgroundSizeChanged = true; 6568 6569 final AttachInfo ai = mAttachInfo; 6570 if (ai != null) { 6571 ai.mViewScrollChanged = true; 6572 } 6573 } 6574 6575 /** 6576 * Interface definition for a callback to be invoked when the layout bounds of a view 6577 * changes due to layout processing. 6578 */ 6579 public interface OnLayoutChangeListener { 6580 /** 6581 * Called when the focus state of a view has changed. 6582 * 6583 * @param v The view whose state has changed. 6584 * @param left The new value of the view's left property. 6585 * @param top The new value of the view's top property. 6586 * @param right The new value of the view's right property. 6587 * @param bottom The new value of the view's bottom property. 6588 * @param oldLeft The previous value of the view's left property. 6589 * @param oldTop The previous value of the view's top property. 6590 * @param oldRight The previous value of the view's right property. 6591 * @param oldBottom The previous value of the view's bottom property. 6592 */ 6593 void onLayoutChange(View v, int left, int top, int right, int bottom, 6594 int oldLeft, int oldTop, int oldRight, int oldBottom); 6595 } 6596 6597 /** 6598 * This is called during layout when the size of this view has changed. If 6599 * you were just added to the view hierarchy, you're called with the old 6600 * values of 0. 6601 * 6602 * @param w Current width of this view. 6603 * @param h Current height of this view. 6604 * @param oldw Old width of this view. 6605 * @param oldh Old height of this view. 6606 */ 6607 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 6608 } 6609 6610 /** 6611 * Called by draw to draw the child views. This may be overridden 6612 * by derived classes to gain control just before its children are drawn 6613 * (but after its own view has been drawn). 6614 * @param canvas the canvas on which to draw the view 6615 */ 6616 protected void dispatchDraw(Canvas canvas) { 6617 } 6618 6619 /** 6620 * Gets the parent of this view. Note that the parent is a 6621 * ViewParent and not necessarily a View. 6622 * 6623 * @return Parent of this view. 6624 */ 6625 public final ViewParent getParent() { 6626 return mParent; 6627 } 6628 6629 /** 6630 * Set the horizontal scrolled position of your view. This will cause a call to 6631 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6632 * invalidated. 6633 * @param value the x position to scroll to 6634 */ 6635 public void setScrollX(int value) { 6636 scrollTo(value, mScrollY); 6637 } 6638 6639 /** 6640 * Set the vertical scrolled position of your view. This will cause a call to 6641 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6642 * invalidated. 6643 * @param value the y position to scroll to 6644 */ 6645 public void setScrollY(int value) { 6646 scrollTo(mScrollX, value); 6647 } 6648 6649 /** 6650 * Return the scrolled left position of this view. This is the left edge of 6651 * the displayed part of your view. You do not need to draw any pixels 6652 * farther left, since those are outside of the frame of your view on 6653 * screen. 6654 * 6655 * @return The left edge of the displayed part of your view, in pixels. 6656 */ 6657 public final int getScrollX() { 6658 return mScrollX; 6659 } 6660 6661 /** 6662 * Return the scrolled top position of this view. This is the top edge of 6663 * the displayed part of your view. You do not need to draw any pixels above 6664 * it, since those are outside of the frame of your view on screen. 6665 * 6666 * @return The top edge of the displayed part of your view, in pixels. 6667 */ 6668 public final int getScrollY() { 6669 return mScrollY; 6670 } 6671 6672 /** 6673 * Return the width of the your view. 6674 * 6675 * @return The width of your view, in pixels. 6676 */ 6677 @ViewDebug.ExportedProperty(category = "layout") 6678 public final int getWidth() { 6679 return mRight - mLeft; 6680 } 6681 6682 /** 6683 * Return the height of your view. 6684 * 6685 * @return The height of your view, in pixels. 6686 */ 6687 @ViewDebug.ExportedProperty(category = "layout") 6688 public final int getHeight() { 6689 return mBottom - mTop; 6690 } 6691 6692 /** 6693 * Return the visible drawing bounds of your view. Fills in the output 6694 * rectangle with the values from getScrollX(), getScrollY(), 6695 * getWidth(), and getHeight(). 6696 * 6697 * @param outRect The (scrolled) drawing bounds of the view. 6698 */ 6699 public void getDrawingRect(Rect outRect) { 6700 outRect.left = mScrollX; 6701 outRect.top = mScrollY; 6702 outRect.right = mScrollX + (mRight - mLeft); 6703 outRect.bottom = mScrollY + (mBottom - mTop); 6704 } 6705 6706 /** 6707 * Like {@link #getMeasuredWidthAndState()}, but only returns the 6708 * raw width component (that is the result is masked by 6709 * {@link #MEASURED_SIZE_MASK}). 6710 * 6711 * @return The raw measured width of this view. 6712 */ 6713 public final int getMeasuredWidth() { 6714 return mMeasuredWidth & MEASURED_SIZE_MASK; 6715 } 6716 6717 /** 6718 * Return the full width measurement information for this view as computed 6719 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6720 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6721 * This should be used during measurement and layout calculations only. Use 6722 * {@link #getWidth()} to see how wide a view is after layout. 6723 * 6724 * @return The measured width of this view as a bit mask. 6725 */ 6726 public final int getMeasuredWidthAndState() { 6727 return mMeasuredWidth; 6728 } 6729 6730 /** 6731 * Like {@link #getMeasuredHeightAndState()}, but only returns the 6732 * raw width component (that is the result is masked by 6733 * {@link #MEASURED_SIZE_MASK}). 6734 * 6735 * @return The raw measured height of this view. 6736 */ 6737 public final int getMeasuredHeight() { 6738 return mMeasuredHeight & MEASURED_SIZE_MASK; 6739 } 6740 6741 /** 6742 * Return the full height measurement information for this view as computed 6743 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6744 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6745 * This should be used during measurement and layout calculations only. Use 6746 * {@link #getHeight()} to see how wide a view is after layout. 6747 * 6748 * @return The measured width of this view as a bit mask. 6749 */ 6750 public final int getMeasuredHeightAndState() { 6751 return mMeasuredHeight; 6752 } 6753 6754 /** 6755 * Return only the state bits of {@link #getMeasuredWidthAndState()} 6756 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 6757 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 6758 * and the height component is at the shifted bits 6759 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 6760 */ 6761 public final int getMeasuredState() { 6762 return (mMeasuredWidth&MEASURED_STATE_MASK) 6763 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 6764 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 6765 } 6766 6767 /** 6768 * The transform matrix of this view, which is calculated based on the current 6769 * roation, scale, and pivot properties. 6770 * 6771 * @see #getRotation() 6772 * @see #getScaleX() 6773 * @see #getScaleY() 6774 * @see #getPivotX() 6775 * @see #getPivotY() 6776 * @return The current transform matrix for the view 6777 */ 6778 public Matrix getMatrix() { 6779 updateMatrix(); 6780 return mMatrix; 6781 } 6782 6783 /** 6784 * Utility function to determine if the value is far enough away from zero to be 6785 * considered non-zero. 6786 * @param value A floating point value to check for zero-ness 6787 * @return whether the passed-in value is far enough away from zero to be considered non-zero 6788 */ 6789 private static boolean nonzero(float value) { 6790 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 6791 } 6792 6793 /** 6794 * Returns true if the transform matrix is the identity matrix. 6795 * Recomputes the matrix if necessary. 6796 * 6797 * @return True if the transform matrix is the identity matrix, false otherwise. 6798 */ 6799 final boolean hasIdentityMatrix() { 6800 updateMatrix(); 6801 return mMatrixIsIdentity; 6802 } 6803 6804 /** 6805 * Recomputes the transform matrix if necessary. 6806 */ 6807 private void updateMatrix() { 6808 if (mMatrixDirty) { 6809 // transform-related properties have changed since the last time someone 6810 // asked for the matrix; recalculate it with the current values 6811 6812 // Figure out if we need to update the pivot point 6813 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6814 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 6815 mPrevWidth = mRight - mLeft; 6816 mPrevHeight = mBottom - mTop; 6817 mPivotX = mPrevWidth / 2f; 6818 mPivotY = mPrevHeight / 2f; 6819 } 6820 } 6821 mMatrix.reset(); 6822 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 6823 mMatrix.setTranslate(mTranslationX, mTranslationY); 6824 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 6825 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6826 } else { 6827 if (mCamera == null) { 6828 mCamera = new Camera(); 6829 matrix3D = new Matrix(); 6830 } 6831 mCamera.save(); 6832 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6833 mCamera.rotate(mRotationX, mRotationY, -mRotation); 6834 mCamera.getMatrix(matrix3D); 6835 matrix3D.preTranslate(-mPivotX, -mPivotY); 6836 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 6837 mMatrix.postConcat(matrix3D); 6838 mCamera.restore(); 6839 } 6840 mMatrixDirty = false; 6841 mMatrixIsIdentity = mMatrix.isIdentity(); 6842 mInverseMatrixDirty = true; 6843 } 6844 } 6845 6846 /** 6847 * Utility method to retrieve the inverse of the current mMatrix property. 6848 * We cache the matrix to avoid recalculating it when transform properties 6849 * have not changed. 6850 * 6851 * @return The inverse of the current matrix of this view. 6852 */ 6853 final Matrix getInverseMatrix() { 6854 updateMatrix(); 6855 if (mInverseMatrixDirty) { 6856 if (mInverseMatrix == null) { 6857 mInverseMatrix = new Matrix(); 6858 } 6859 mMatrix.invert(mInverseMatrix); 6860 mInverseMatrixDirty = false; 6861 } 6862 return mInverseMatrix; 6863 } 6864 6865 /** 6866 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 6867 * views are drawn) from the camera to this view. The camera's distance 6868 * affects 3D transformations, for instance rotations around the X and Y 6869 * axis. If the rotationX or rotationY properties are changed and this view is 6870 * large (more than half the size of the screen), it is recommended to always 6871 * use a camera distance that's greater than the height (X axis rotation) or 6872 * the width (Y axis rotation) of this view.</p> 6873 * 6874 * <p>The distance of the camera from the view plane can have an affect on the 6875 * perspective distortion of the view when it is rotated around the x or y axis. 6876 * For example, a large distance will result in a large viewing angle, and there 6877 * will not be much perspective distortion of the view as it rotates. A short 6878 * distance may cause much more perspective distortion upon rotation, and can 6879 * also result in some drawing artifacts if the rotated view ends up partially 6880 * behind the camera (which is why the recommendation is to use a distance at 6881 * least as far as the size of the view, if the view is to be rotated.)</p> 6882 * 6883 * <p>The distance is expressed in "depth pixels." The default distance depends 6884 * on the screen density. For instance, on a medium density display, the 6885 * default distance is 1280. On a high density display, the default distance 6886 * is 1920.</p> 6887 * 6888 * <p>If you want to specify a distance that leads to visually consistent 6889 * results across various densities, use the following formula:</p> 6890 * <pre> 6891 * float scale = context.getResources().getDisplayMetrics().density; 6892 * view.setCameraDistance(distance * scale); 6893 * </pre> 6894 * 6895 * <p>The density scale factor of a high density display is 1.5, 6896 * and 1920 = 1280 * 1.5.</p> 6897 * 6898 * @param distance The distance in "depth pixels", if negative the opposite 6899 * value is used 6900 * 6901 * @see #setRotationX(float) 6902 * @see #setRotationY(float) 6903 */ 6904 public void setCameraDistance(float distance) { 6905 invalidateParentCaches(); 6906 invalidate(false); 6907 6908 final float dpi = mResources.getDisplayMetrics().densityDpi; 6909 if (mCamera == null) { 6910 mCamera = new Camera(); 6911 matrix3D = new Matrix(); 6912 } 6913 6914 mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 6915 mMatrixDirty = true; 6916 6917 invalidate(false); 6918 } 6919 6920 /** 6921 * The degrees that the view is rotated around the pivot point. 6922 * 6923 * @see #setRotation(float) 6924 * @see #getPivotX() 6925 * @see #getPivotY() 6926 * 6927 * @return The degrees of rotation. 6928 */ 6929 public float getRotation() { 6930 return mRotation; 6931 } 6932 6933 /** 6934 * Sets the degrees that the view is rotated around the pivot point. Increasing values 6935 * result in clockwise rotation. 6936 * 6937 * @param rotation The degrees of rotation. 6938 * 6939 * @see #getRotation() 6940 * @see #getPivotX() 6941 * @see #getPivotY() 6942 * @see #setRotationX(float) 6943 * @see #setRotationY(float) 6944 * 6945 * @attr ref android.R.styleable#View_rotation 6946 */ 6947 public void setRotation(float rotation) { 6948 if (mRotation != rotation) { 6949 invalidateParentCaches(); 6950 // Double-invalidation is necessary to capture view's old and new areas 6951 invalidate(false); 6952 mRotation = rotation; 6953 mMatrixDirty = true; 6954 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6955 invalidate(false); 6956 } 6957 } 6958 6959 /** 6960 * The degrees that the view is rotated around the vertical axis through the pivot point. 6961 * 6962 * @see #getPivotX() 6963 * @see #getPivotY() 6964 * @see #setRotationY(float) 6965 * 6966 * @return The degrees of Y rotation. 6967 */ 6968 public float getRotationY() { 6969 return mRotationY; 6970 } 6971 6972 /** 6973 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 6974 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 6975 * down the y axis. 6976 * 6977 * When rotating large views, it is recommended to adjust the camera distance 6978 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 6979 * 6980 * @param rotationY The degrees of Y rotation. 6981 * 6982 * @see #getRotationY() 6983 * @see #getPivotX() 6984 * @see #getPivotY() 6985 * @see #setRotation(float) 6986 * @see #setRotationX(float) 6987 * @see #setCameraDistance(float) 6988 * 6989 * @attr ref android.R.styleable#View_rotationY 6990 */ 6991 public void setRotationY(float rotationY) { 6992 if (mRotationY != rotationY) { 6993 invalidateParentCaches(); 6994 // Double-invalidation is necessary to capture view's old and new areas 6995 invalidate(false); 6996 mRotationY = rotationY; 6997 mMatrixDirty = true; 6998 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6999 invalidate(false); 7000 } 7001 } 7002 7003 /** 7004 * The degrees that the view is rotated around the horizontal axis through the pivot point. 7005 * 7006 * @see #getPivotX() 7007 * @see #getPivotY() 7008 * @see #setRotationX(float) 7009 * 7010 * @return The degrees of X rotation. 7011 */ 7012 public float getRotationX() { 7013 return mRotationX; 7014 } 7015 7016 /** 7017 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 7018 * Increasing values result in clockwise rotation from the viewpoint of looking down the 7019 * x axis. 7020 * 7021 * When rotating large views, it is recommended to adjust the camera distance 7022 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7023 * 7024 * @param rotationX The degrees of X rotation. 7025 * 7026 * @see #getRotationX() 7027 * @see #getPivotX() 7028 * @see #getPivotY() 7029 * @see #setRotation(float) 7030 * @see #setRotationY(float) 7031 * @see #setCameraDistance(float) 7032 * 7033 * @attr ref android.R.styleable#View_rotationX 7034 */ 7035 public void setRotationX(float rotationX) { 7036 if (mRotationX != rotationX) { 7037 invalidateParentCaches(); 7038 // Double-invalidation is necessary to capture view's old and new areas 7039 invalidate(false); 7040 mRotationX = rotationX; 7041 mMatrixDirty = true; 7042 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7043 invalidate(false); 7044 } 7045 } 7046 7047 /** 7048 * The amount that the view is scaled in x around the pivot point, as a proportion of 7049 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 7050 * 7051 * <p>By default, this is 1.0f. 7052 * 7053 * @see #getPivotX() 7054 * @see #getPivotY() 7055 * @return The scaling factor. 7056 */ 7057 public float getScaleX() { 7058 return mScaleX; 7059 } 7060 7061 /** 7062 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 7063 * the view's unscaled width. A value of 1 means that no scaling is applied. 7064 * 7065 * @param scaleX The scaling factor. 7066 * @see #getPivotX() 7067 * @see #getPivotY() 7068 * 7069 * @attr ref android.R.styleable#View_scaleX 7070 */ 7071 public void setScaleX(float scaleX) { 7072 if (mScaleX != scaleX) { 7073 invalidateParentCaches(); 7074 // Double-invalidation is necessary to capture view's old and new areas 7075 invalidate(false); 7076 mScaleX = scaleX; 7077 mMatrixDirty = true; 7078 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7079 invalidate(false); 7080 } 7081 } 7082 7083 /** 7084 * The amount that the view is scaled in y around the pivot point, as a proportion of 7085 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 7086 * 7087 * <p>By default, this is 1.0f. 7088 * 7089 * @see #getPivotX() 7090 * @see #getPivotY() 7091 * @return The scaling factor. 7092 */ 7093 public float getScaleY() { 7094 return mScaleY; 7095 } 7096 7097 /** 7098 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 7099 * the view's unscaled width. A value of 1 means that no scaling is applied. 7100 * 7101 * @param scaleY The scaling factor. 7102 * @see #getPivotX() 7103 * @see #getPivotY() 7104 * 7105 * @attr ref android.R.styleable#View_scaleY 7106 */ 7107 public void setScaleY(float scaleY) { 7108 if (mScaleY != scaleY) { 7109 invalidateParentCaches(); 7110 // Double-invalidation is necessary to capture view's old and new areas 7111 invalidate(false); 7112 mScaleY = scaleY; 7113 mMatrixDirty = true; 7114 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7115 invalidate(false); 7116 } 7117 } 7118 7119 /** 7120 * The x location of the point around which the view is {@link #setRotation(float) rotated} 7121 * and {@link #setScaleX(float) scaled}. 7122 * 7123 * @see #getRotation() 7124 * @see #getScaleX() 7125 * @see #getScaleY() 7126 * @see #getPivotY() 7127 * @return The x location of the pivot point. 7128 */ 7129 public float getPivotX() { 7130 return mPivotX; 7131 } 7132 7133 /** 7134 * Sets the x location of the point around which the view is 7135 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 7136 * By default, the pivot point is centered on the object. 7137 * Setting this property disables this behavior and causes the view to use only the 7138 * explicitly set pivotX and pivotY values. 7139 * 7140 * @param pivotX The x location of the pivot point. 7141 * @see #getRotation() 7142 * @see #getScaleX() 7143 * @see #getScaleY() 7144 * @see #getPivotY() 7145 * 7146 * @attr ref android.R.styleable#View_transformPivotX 7147 */ 7148 public void setPivotX(float pivotX) { 7149 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7150 if (mPivotX != pivotX) { 7151 invalidateParentCaches(); 7152 // Double-invalidation is necessary to capture view's old and new areas 7153 invalidate(false); 7154 mPivotX = pivotX; 7155 mMatrixDirty = true; 7156 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7157 invalidate(false); 7158 } 7159 } 7160 7161 /** 7162 * The y location of the point around which the view is {@link #setRotation(float) rotated} 7163 * and {@link #setScaleY(float) scaled}. 7164 * 7165 * @see #getRotation() 7166 * @see #getScaleX() 7167 * @see #getScaleY() 7168 * @see #getPivotY() 7169 * @return The y location of the pivot point. 7170 */ 7171 public float getPivotY() { 7172 return mPivotY; 7173 } 7174 7175 /** 7176 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 7177 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 7178 * Setting this property disables this behavior and causes the view to use only the 7179 * explicitly set pivotX and pivotY values. 7180 * 7181 * @param pivotY The y location of the pivot point. 7182 * @see #getRotation() 7183 * @see #getScaleX() 7184 * @see #getScaleY() 7185 * @see #getPivotY() 7186 * 7187 * @attr ref android.R.styleable#View_transformPivotY 7188 */ 7189 public void setPivotY(float pivotY) { 7190 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7191 if (mPivotY != pivotY) { 7192 invalidateParentCaches(); 7193 // Double-invalidation is necessary to capture view's old and new areas 7194 invalidate(false); 7195 mPivotY = pivotY; 7196 mMatrixDirty = true; 7197 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7198 invalidate(false); 7199 } 7200 } 7201 7202 /** 7203 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 7204 * completely transparent and 1 means the view is completely opaque. 7205 * 7206 * <p>By default this is 1.0f. 7207 * @return The opacity of the view. 7208 */ 7209 public float getAlpha() { 7210 return mAlpha; 7211 } 7212 7213 /** 7214 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 7215 * completely transparent and 1 means the view is completely opaque.</p> 7216 * 7217 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 7218 * responsible for applying the opacity itself. Otherwise, calling this method is 7219 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 7220 * setting a hardware layer.</p> 7221 * 7222 * @param alpha The opacity of the view. 7223 * 7224 * @see #setLayerType(int, android.graphics.Paint) 7225 * 7226 * @attr ref android.R.styleable#View_alpha 7227 */ 7228 public void setAlpha(float alpha) { 7229 mAlpha = alpha; 7230 invalidateParentCaches(); 7231 if (onSetAlpha((int) (alpha * 255))) { 7232 mPrivateFlags |= ALPHA_SET; 7233 // subclass is handling alpha - don't optimize rendering cache invalidation 7234 invalidate(true); 7235 } else { 7236 mPrivateFlags &= ~ALPHA_SET; 7237 invalidate(false); 7238 } 7239 } 7240 7241 /** 7242 * Faster version of setAlpha() which performs the same steps except there are 7243 * no calls to invalidate(). The caller of this function should perform proper invalidation 7244 * on the parent and this object. The return value indicates whether the subclass handles 7245 * alpha (the return value for onSetAlpha()). 7246 * 7247 * @param alpha The new value for the alpha property 7248 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) 7249 */ 7250 boolean setAlphaNoInvalidation(float alpha) { 7251 mAlpha = alpha; 7252 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 7253 if (subclassHandlesAlpha) { 7254 mPrivateFlags |= ALPHA_SET; 7255 } else { 7256 mPrivateFlags &= ~ALPHA_SET; 7257 } 7258 return subclassHandlesAlpha; 7259 } 7260 7261 /** 7262 * Top position of this view relative to its parent. 7263 * 7264 * @return The top of this view, in pixels. 7265 */ 7266 @ViewDebug.CapturedViewProperty 7267 public final int getTop() { 7268 return mTop; 7269 } 7270 7271 /** 7272 * Sets the top position of this view relative to its parent. This method is meant to be called 7273 * by the layout system and should not generally be called otherwise, because the property 7274 * may be changed at any time by the layout. 7275 * 7276 * @param top The top of this view, in pixels. 7277 */ 7278 public final void setTop(int top) { 7279 if (top != mTop) { 7280 updateMatrix(); 7281 if (mMatrixIsIdentity) { 7282 if (mAttachInfo != null) { 7283 int minTop; 7284 int yLoc; 7285 if (top < mTop) { 7286 minTop = top; 7287 yLoc = top - mTop; 7288 } else { 7289 minTop = mTop; 7290 yLoc = 0; 7291 } 7292 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 7293 } 7294 } else { 7295 // Double-invalidation is necessary to capture view's old and new areas 7296 invalidate(true); 7297 } 7298 7299 int width = mRight - mLeft; 7300 int oldHeight = mBottom - mTop; 7301 7302 mTop = top; 7303 7304 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7305 7306 if (!mMatrixIsIdentity) { 7307 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7308 // A change in dimension means an auto-centered pivot point changes, too 7309 mMatrixDirty = true; 7310 } 7311 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7312 invalidate(true); 7313 } 7314 mBackgroundSizeChanged = true; 7315 invalidateParentIfNeeded(); 7316 } 7317 } 7318 7319 /** 7320 * Bottom position of this view relative to its parent. 7321 * 7322 * @return The bottom of this view, in pixels. 7323 */ 7324 @ViewDebug.CapturedViewProperty 7325 public final int getBottom() { 7326 return mBottom; 7327 } 7328 7329 /** 7330 * True if this view has changed since the last time being drawn. 7331 * 7332 * @return The dirty state of this view. 7333 */ 7334 public boolean isDirty() { 7335 return (mPrivateFlags & DIRTY_MASK) != 0; 7336 } 7337 7338 /** 7339 * Sets the bottom position of this view relative to its parent. This method is meant to be 7340 * called by the layout system and should not generally be called otherwise, because the 7341 * property may be changed at any time by the layout. 7342 * 7343 * @param bottom The bottom of this view, in pixels. 7344 */ 7345 public final void setBottom(int bottom) { 7346 if (bottom != mBottom) { 7347 updateMatrix(); 7348 if (mMatrixIsIdentity) { 7349 if (mAttachInfo != null) { 7350 int maxBottom; 7351 if (bottom < mBottom) { 7352 maxBottom = mBottom; 7353 } else { 7354 maxBottom = bottom; 7355 } 7356 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 7357 } 7358 } else { 7359 // Double-invalidation is necessary to capture view's old and new areas 7360 invalidate(true); 7361 } 7362 7363 int width = mRight - mLeft; 7364 int oldHeight = mBottom - mTop; 7365 7366 mBottom = bottom; 7367 7368 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7369 7370 if (!mMatrixIsIdentity) { 7371 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7372 // A change in dimension means an auto-centered pivot point changes, too 7373 mMatrixDirty = true; 7374 } 7375 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7376 invalidate(true); 7377 } 7378 mBackgroundSizeChanged = true; 7379 invalidateParentIfNeeded(); 7380 } 7381 } 7382 7383 /** 7384 * Left position of this view relative to its parent. 7385 * 7386 * @return The left edge of this view, in pixels. 7387 */ 7388 @ViewDebug.CapturedViewProperty 7389 public final int getLeft() { 7390 return mLeft; 7391 } 7392 7393 /** 7394 * Sets the left position of this view relative to its parent. This method is meant to be called 7395 * by the layout system and should not generally be called otherwise, because the property 7396 * may be changed at any time by the layout. 7397 * 7398 * @param left The bottom of this view, in pixels. 7399 */ 7400 public final void setLeft(int left) { 7401 if (left != mLeft) { 7402 updateMatrix(); 7403 if (mMatrixIsIdentity) { 7404 if (mAttachInfo != null) { 7405 int minLeft; 7406 int xLoc; 7407 if (left < mLeft) { 7408 minLeft = left; 7409 xLoc = left - mLeft; 7410 } else { 7411 minLeft = mLeft; 7412 xLoc = 0; 7413 } 7414 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7415 } 7416 } else { 7417 // Double-invalidation is necessary to capture view's old and new areas 7418 invalidate(true); 7419 } 7420 7421 int oldWidth = mRight - mLeft; 7422 int height = mBottom - mTop; 7423 7424 mLeft = left; 7425 7426 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7427 7428 if (!mMatrixIsIdentity) { 7429 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7430 // A change in dimension means an auto-centered pivot point changes, too 7431 mMatrixDirty = true; 7432 } 7433 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7434 invalidate(true); 7435 } 7436 mBackgroundSizeChanged = true; 7437 invalidateParentIfNeeded(); 7438 } 7439 } 7440 7441 /** 7442 * Right position of this view relative to its parent. 7443 * 7444 * @return The right edge of this view, in pixels. 7445 */ 7446 @ViewDebug.CapturedViewProperty 7447 public final int getRight() { 7448 return mRight; 7449 } 7450 7451 /** 7452 * Sets the right position of this view relative to its parent. This method is meant to be called 7453 * by the layout system and should not generally be called otherwise, because the property 7454 * may be changed at any time by the layout. 7455 * 7456 * @param right The bottom of this view, in pixels. 7457 */ 7458 public final void setRight(int right) { 7459 if (right != mRight) { 7460 updateMatrix(); 7461 if (mMatrixIsIdentity) { 7462 if (mAttachInfo != null) { 7463 int maxRight; 7464 if (right < mRight) { 7465 maxRight = mRight; 7466 } else { 7467 maxRight = right; 7468 } 7469 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7470 } 7471 } else { 7472 // Double-invalidation is necessary to capture view's old and new areas 7473 invalidate(true); 7474 } 7475 7476 int oldWidth = mRight - mLeft; 7477 int height = mBottom - mTop; 7478 7479 mRight = right; 7480 7481 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7482 7483 if (!mMatrixIsIdentity) { 7484 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7485 // A change in dimension means an auto-centered pivot point changes, too 7486 mMatrixDirty = true; 7487 } 7488 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7489 invalidate(true); 7490 } 7491 mBackgroundSizeChanged = true; 7492 invalidateParentIfNeeded(); 7493 } 7494 } 7495 7496 /** 7497 * The visual x position of this view, in pixels. This is equivalent to the 7498 * {@link #setTranslationX(float) translationX} property plus the current 7499 * {@link #getLeft() left} property. 7500 * 7501 * @return The visual x position of this view, in pixels. 7502 */ 7503 public float getX() { 7504 return mLeft + mTranslationX; 7505 } 7506 7507 /** 7508 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 7509 * {@link #setTranslationX(float) translationX} property to be the difference between 7510 * the x value passed in and the current {@link #getLeft() left} property. 7511 * 7512 * @param x The visual x position of this view, in pixels. 7513 */ 7514 public void setX(float x) { 7515 setTranslationX(x - mLeft); 7516 } 7517 7518 /** 7519 * The visual y position of this view, in pixels. This is equivalent to the 7520 * {@link #setTranslationY(float) translationY} property plus the current 7521 * {@link #getTop() top} property. 7522 * 7523 * @return The visual y position of this view, in pixels. 7524 */ 7525 public float getY() { 7526 return mTop + mTranslationY; 7527 } 7528 7529 /** 7530 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 7531 * {@link #setTranslationY(float) translationY} property to be the difference between 7532 * the y value passed in and the current {@link #getTop() top} property. 7533 * 7534 * @param y The visual y position of this view, in pixels. 7535 */ 7536 public void setY(float y) { 7537 setTranslationY(y - mTop); 7538 } 7539 7540 7541 /** 7542 * The horizontal location of this view relative to its {@link #getLeft() left} position. 7543 * This position is post-layout, in addition to wherever the object's 7544 * layout placed it. 7545 * 7546 * @return The horizontal position of this view relative to its left position, in pixels. 7547 */ 7548 public float getTranslationX() { 7549 return mTranslationX; 7550 } 7551 7552 /** 7553 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 7554 * This effectively positions the object post-layout, in addition to wherever the object's 7555 * layout placed it. 7556 * 7557 * @param translationX The horizontal position of this view relative to its left position, 7558 * in pixels. 7559 * 7560 * @attr ref android.R.styleable#View_translationX 7561 */ 7562 public void setTranslationX(float translationX) { 7563 if (mTranslationX != translationX) { 7564 invalidateParentCaches(); 7565 // Double-invalidation is necessary to capture view's old and new areas 7566 invalidate(false); 7567 mTranslationX = translationX; 7568 mMatrixDirty = true; 7569 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7570 invalidate(false); 7571 } 7572 } 7573 7574 /** 7575 * The horizontal location of this view relative to its {@link #getTop() top} position. 7576 * This position is post-layout, in addition to wherever the object's 7577 * layout placed it. 7578 * 7579 * @return The vertical position of this view relative to its top position, 7580 * in pixels. 7581 */ 7582 public float getTranslationY() { 7583 return mTranslationY; 7584 } 7585 7586 /** 7587 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 7588 * This effectively positions the object post-layout, in addition to wherever the object's 7589 * layout placed it. 7590 * 7591 * @param translationY The vertical position of this view relative to its top position, 7592 * in pixels. 7593 * 7594 * @attr ref android.R.styleable#View_translationY 7595 */ 7596 public void setTranslationY(float translationY) { 7597 if (mTranslationY != translationY) { 7598 invalidateParentCaches(); 7599 // Double-invalidation is necessary to capture view's old and new areas 7600 invalidate(false); 7601 mTranslationY = translationY; 7602 mMatrixDirty = true; 7603 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7604 invalidate(false); 7605 } 7606 } 7607 7608 /** 7609 * @hide 7610 */ 7611 public void setFastTranslationX(float x) { 7612 mTranslationX = x; 7613 mMatrixDirty = true; 7614 } 7615 7616 /** 7617 * @hide 7618 */ 7619 public void setFastTranslationY(float y) { 7620 mTranslationY = y; 7621 mMatrixDirty = true; 7622 } 7623 7624 /** 7625 * @hide 7626 */ 7627 public void setFastX(float x) { 7628 mTranslationX = x - mLeft; 7629 mMatrixDirty = true; 7630 } 7631 7632 /** 7633 * @hide 7634 */ 7635 public void setFastY(float y) { 7636 mTranslationY = y - mTop; 7637 mMatrixDirty = true; 7638 } 7639 7640 /** 7641 * @hide 7642 */ 7643 public void setFastScaleX(float x) { 7644 mScaleX = x; 7645 mMatrixDirty = true; 7646 } 7647 7648 /** 7649 * @hide 7650 */ 7651 public void setFastScaleY(float y) { 7652 mScaleY = y; 7653 mMatrixDirty = true; 7654 } 7655 7656 /** 7657 * @hide 7658 */ 7659 public void setFastAlpha(float alpha) { 7660 mAlpha = alpha; 7661 } 7662 7663 /** 7664 * @hide 7665 */ 7666 public void setFastRotationY(float y) { 7667 mRotationY = y; 7668 mMatrixDirty = true; 7669 } 7670 7671 /** 7672 * Hit rectangle in parent's coordinates 7673 * 7674 * @param outRect The hit rectangle of the view. 7675 */ 7676 public void getHitRect(Rect outRect) { 7677 updateMatrix(); 7678 if (mMatrixIsIdentity || mAttachInfo == null) { 7679 outRect.set(mLeft, mTop, mRight, mBottom); 7680 } else { 7681 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 7682 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 7683 mMatrix.mapRect(tmpRect); 7684 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 7685 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 7686 } 7687 } 7688 7689 /** 7690 * Determines whether the given point, in local coordinates is inside the view. 7691 */ 7692 /*package*/ final boolean pointInView(float localX, float localY) { 7693 return localX >= 0 && localX < (mRight - mLeft) 7694 && localY >= 0 && localY < (mBottom - mTop); 7695 } 7696 7697 /** 7698 * Utility method to determine whether the given point, in local coordinates, 7699 * is inside the view, where the area of the view is expanded by the slop factor. 7700 * This method is called while processing touch-move events to determine if the event 7701 * is still within the view. 7702 */ 7703 private boolean pointInView(float localX, float localY, float slop) { 7704 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 7705 localY < ((mBottom - mTop) + slop); 7706 } 7707 7708 /** 7709 * When a view has focus and the user navigates away from it, the next view is searched for 7710 * starting from the rectangle filled in by this method. 7711 * 7712 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 7713 * of the view. However, if your view maintains some idea of internal selection, 7714 * such as a cursor, or a selected row or column, you should override this method and 7715 * fill in a more specific rectangle. 7716 * 7717 * @param r The rectangle to fill in, in this view's coordinates. 7718 */ 7719 public void getFocusedRect(Rect r) { 7720 getDrawingRect(r); 7721 } 7722 7723 /** 7724 * If some part of this view is not clipped by any of its parents, then 7725 * return that area in r in global (root) coordinates. To convert r to local 7726 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 7727 * -globalOffset.y)) If the view is completely clipped or translated out, 7728 * return false. 7729 * 7730 * @param r If true is returned, r holds the global coordinates of the 7731 * visible portion of this view. 7732 * @param globalOffset If true is returned, globalOffset holds the dx,dy 7733 * between this view and its root. globalOffet may be null. 7734 * @return true if r is non-empty (i.e. part of the view is visible at the 7735 * root level. 7736 */ 7737 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 7738 int width = mRight - mLeft; 7739 int height = mBottom - mTop; 7740 if (width > 0 && height > 0) { 7741 r.set(0, 0, width, height); 7742 if (globalOffset != null) { 7743 globalOffset.set(-mScrollX, -mScrollY); 7744 } 7745 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 7746 } 7747 return false; 7748 } 7749 7750 public final boolean getGlobalVisibleRect(Rect r) { 7751 return getGlobalVisibleRect(r, null); 7752 } 7753 7754 public final boolean getLocalVisibleRect(Rect r) { 7755 Point offset = new Point(); 7756 if (getGlobalVisibleRect(r, offset)) { 7757 r.offset(-offset.x, -offset.y); // make r local 7758 return true; 7759 } 7760 return false; 7761 } 7762 7763 /** 7764 * Offset this view's vertical location by the specified number of pixels. 7765 * 7766 * @param offset the number of pixels to offset the view by 7767 */ 7768 public void offsetTopAndBottom(int offset) { 7769 if (offset != 0) { 7770 updateMatrix(); 7771 if (mMatrixIsIdentity) { 7772 final ViewParent p = mParent; 7773 if (p != null && mAttachInfo != null) { 7774 final Rect r = mAttachInfo.mTmpInvalRect; 7775 int minTop; 7776 int maxBottom; 7777 int yLoc; 7778 if (offset < 0) { 7779 minTop = mTop + offset; 7780 maxBottom = mBottom; 7781 yLoc = offset; 7782 } else { 7783 minTop = mTop; 7784 maxBottom = mBottom + offset; 7785 yLoc = 0; 7786 } 7787 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 7788 p.invalidateChild(this, r); 7789 } 7790 } else { 7791 invalidate(false); 7792 } 7793 7794 mTop += offset; 7795 mBottom += offset; 7796 7797 if (!mMatrixIsIdentity) { 7798 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7799 invalidate(false); 7800 } 7801 invalidateParentIfNeeded(); 7802 } 7803 } 7804 7805 /** 7806 * Offset this view's horizontal location by the specified amount of pixels. 7807 * 7808 * @param offset the numer of pixels to offset the view by 7809 */ 7810 public void offsetLeftAndRight(int offset) { 7811 if (offset != 0) { 7812 updateMatrix(); 7813 if (mMatrixIsIdentity) { 7814 final ViewParent p = mParent; 7815 if (p != null && mAttachInfo != null) { 7816 final Rect r = mAttachInfo.mTmpInvalRect; 7817 int minLeft; 7818 int maxRight; 7819 if (offset < 0) { 7820 minLeft = mLeft + offset; 7821 maxRight = mRight; 7822 } else { 7823 minLeft = mLeft; 7824 maxRight = mRight + offset; 7825 } 7826 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 7827 p.invalidateChild(this, r); 7828 } 7829 } else { 7830 invalidate(false); 7831 } 7832 7833 mLeft += offset; 7834 mRight += offset; 7835 7836 if (!mMatrixIsIdentity) { 7837 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7838 invalidate(false); 7839 } 7840 invalidateParentIfNeeded(); 7841 } 7842 } 7843 7844 /** 7845 * Get the LayoutParams associated with this view. All views should have 7846 * layout parameters. These supply parameters to the <i>parent</i> of this 7847 * view specifying how it should be arranged. There are many subclasses of 7848 * ViewGroup.LayoutParams, and these correspond to the different subclasses 7849 * of ViewGroup that are responsible for arranging their children. 7850 * 7851 * This method may return null if this View is not attached to a parent 7852 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 7853 * was not invoked successfully. When a View is attached to a parent 7854 * ViewGroup, this method must not return null. 7855 * 7856 * @return The LayoutParams associated with this view, or null if no 7857 * parameters have been set yet 7858 */ 7859 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 7860 public ViewGroup.LayoutParams getLayoutParams() { 7861 return mLayoutParams; 7862 } 7863 7864 /** 7865 * Set the layout parameters associated with this view. These supply 7866 * parameters to the <i>parent</i> of this view specifying how it should be 7867 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 7868 * correspond to the different subclasses of ViewGroup that are responsible 7869 * for arranging their children. 7870 * 7871 * @param params The layout parameters for this view, cannot be null 7872 */ 7873 public void setLayoutParams(ViewGroup.LayoutParams params) { 7874 if (params == null) { 7875 throw new NullPointerException("Layout parameters cannot be null"); 7876 } 7877 mLayoutParams = params; 7878 requestLayout(); 7879 } 7880 7881 /** 7882 * Set the scrolled position of your view. This will cause a call to 7883 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7884 * invalidated. 7885 * @param x the x position to scroll to 7886 * @param y the y position to scroll to 7887 */ 7888 public void scrollTo(int x, int y) { 7889 if (mScrollX != x || mScrollY != y) { 7890 int oldX = mScrollX; 7891 int oldY = mScrollY; 7892 mScrollX = x; 7893 mScrollY = y; 7894 invalidateParentCaches(); 7895 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 7896 if (!awakenScrollBars()) { 7897 invalidate(true); 7898 } 7899 } 7900 } 7901 7902 /** 7903 * Move the scrolled position of your view. This will cause a call to 7904 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7905 * invalidated. 7906 * @param x the amount of pixels to scroll by horizontally 7907 * @param y the amount of pixels to scroll by vertically 7908 */ 7909 public void scrollBy(int x, int y) { 7910 scrollTo(mScrollX + x, mScrollY + y); 7911 } 7912 7913 /** 7914 * <p>Trigger the scrollbars to draw. When invoked this method starts an 7915 * animation to fade the scrollbars out after a default delay. If a subclass 7916 * provides animated scrolling, the start delay should equal the duration 7917 * of the scrolling animation.</p> 7918 * 7919 * <p>The animation starts only if at least one of the scrollbars is 7920 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 7921 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7922 * this method returns true, and false otherwise. If the animation is 7923 * started, this method calls {@link #invalidate()}; in that case the 7924 * caller should not call {@link #invalidate()}.</p> 7925 * 7926 * <p>This method should be invoked every time a subclass directly updates 7927 * the scroll parameters.</p> 7928 * 7929 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 7930 * and {@link #scrollTo(int, int)}.</p> 7931 * 7932 * @return true if the animation is played, false otherwise 7933 * 7934 * @see #awakenScrollBars(int) 7935 * @see #scrollBy(int, int) 7936 * @see #scrollTo(int, int) 7937 * @see #isHorizontalScrollBarEnabled() 7938 * @see #isVerticalScrollBarEnabled() 7939 * @see #setHorizontalScrollBarEnabled(boolean) 7940 * @see #setVerticalScrollBarEnabled(boolean) 7941 */ 7942 protected boolean awakenScrollBars() { 7943 return mScrollCache != null && 7944 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 7945 } 7946 7947 /** 7948 * Trigger the scrollbars to draw. 7949 * This method differs from awakenScrollBars() only in its default duration. 7950 * initialAwakenScrollBars() will show the scroll bars for longer than 7951 * usual to give the user more of a chance to notice them. 7952 * 7953 * @return true if the animation is played, false otherwise. 7954 */ 7955 private boolean initialAwakenScrollBars() { 7956 return mScrollCache != null && 7957 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 7958 } 7959 7960 /** 7961 * <p> 7962 * Trigger the scrollbars to draw. When invoked this method starts an 7963 * animation to fade the scrollbars out after a fixed delay. If a subclass 7964 * provides animated scrolling, the start delay should equal the duration of 7965 * the scrolling animation. 7966 * </p> 7967 * 7968 * <p> 7969 * The animation starts only if at least one of the scrollbars is enabled, 7970 * as specified by {@link #isHorizontalScrollBarEnabled()} and 7971 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7972 * this method returns true, and false otherwise. If the animation is 7973 * started, this method calls {@link #invalidate()}; in that case the caller 7974 * should not call {@link #invalidate()}. 7975 * </p> 7976 * 7977 * <p> 7978 * This method should be invoked everytime a subclass directly updates the 7979 * scroll parameters. 7980 * </p> 7981 * 7982 * @param startDelay the delay, in milliseconds, after which the animation 7983 * should start; when the delay is 0, the animation starts 7984 * immediately 7985 * @return true if the animation is played, false otherwise 7986 * 7987 * @see #scrollBy(int, int) 7988 * @see #scrollTo(int, int) 7989 * @see #isHorizontalScrollBarEnabled() 7990 * @see #isVerticalScrollBarEnabled() 7991 * @see #setHorizontalScrollBarEnabled(boolean) 7992 * @see #setVerticalScrollBarEnabled(boolean) 7993 */ 7994 protected boolean awakenScrollBars(int startDelay) { 7995 return awakenScrollBars(startDelay, true); 7996 } 7997 7998 /** 7999 * <p> 8000 * Trigger the scrollbars to draw. When invoked this method starts an 8001 * animation to fade the scrollbars out after a fixed delay. If a subclass 8002 * provides animated scrolling, the start delay should equal the duration of 8003 * the scrolling animation. 8004 * </p> 8005 * 8006 * <p> 8007 * The animation starts only if at least one of the scrollbars is enabled, 8008 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8009 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8010 * this method returns true, and false otherwise. If the animation is 8011 * started, this method calls {@link #invalidate()} if the invalidate parameter 8012 * is set to true; in that case the caller 8013 * should not call {@link #invalidate()}. 8014 * </p> 8015 * 8016 * <p> 8017 * This method should be invoked everytime a subclass directly updates the 8018 * scroll parameters. 8019 * </p> 8020 * 8021 * @param startDelay the delay, in milliseconds, after which the animation 8022 * should start; when the delay is 0, the animation starts 8023 * immediately 8024 * 8025 * @param invalidate Wheter this method should call invalidate 8026 * 8027 * @return true if the animation is played, false otherwise 8028 * 8029 * @see #scrollBy(int, int) 8030 * @see #scrollTo(int, int) 8031 * @see #isHorizontalScrollBarEnabled() 8032 * @see #isVerticalScrollBarEnabled() 8033 * @see #setHorizontalScrollBarEnabled(boolean) 8034 * @see #setVerticalScrollBarEnabled(boolean) 8035 */ 8036 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 8037 final ScrollabilityCache scrollCache = mScrollCache; 8038 8039 if (scrollCache == null || !scrollCache.fadeScrollBars) { 8040 return false; 8041 } 8042 8043 if (scrollCache.scrollBar == null) { 8044 scrollCache.scrollBar = new ScrollBarDrawable(); 8045 } 8046 8047 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 8048 8049 if (invalidate) { 8050 // Invalidate to show the scrollbars 8051 invalidate(true); 8052 } 8053 8054 if (scrollCache.state == ScrollabilityCache.OFF) { 8055 // FIXME: this is copied from WindowManagerService. 8056 // We should get this value from the system when it 8057 // is possible to do so. 8058 final int KEY_REPEAT_FIRST_DELAY = 750; 8059 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 8060 } 8061 8062 // Tell mScrollCache when we should start fading. This may 8063 // extend the fade start time if one was already scheduled 8064 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 8065 scrollCache.fadeStartTime = fadeStartTime; 8066 scrollCache.state = ScrollabilityCache.ON; 8067 8068 // Schedule our fader to run, unscheduling any old ones first 8069 if (mAttachInfo != null) { 8070 mAttachInfo.mHandler.removeCallbacks(scrollCache); 8071 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 8072 } 8073 8074 return true; 8075 } 8076 8077 return false; 8078 } 8079 8080 /** 8081 * Do not invalidate views which are not visible and which are not running an animation. They 8082 * will not get drawn and they should not set dirty flags as if they will be drawn 8083 */ 8084 private boolean skipInvalidate() { 8085 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 8086 (!(mParent instanceof ViewGroup) || 8087 !((ViewGroup) mParent).isViewTransitioning(this)); 8088 } 8089 /** 8090 * Mark the the area defined by dirty as needing to be drawn. If the view is 8091 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 8092 * in the future. This must be called from a UI thread. To call from a non-UI 8093 * thread, call {@link #postInvalidate()}. 8094 * 8095 * WARNING: This method is destructive to dirty. 8096 * @param dirty the rectangle representing the bounds of the dirty region 8097 */ 8098 public void invalidate(Rect dirty) { 8099 if (ViewDebug.TRACE_HIERARCHY) { 8100 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8101 } 8102 8103 if (skipInvalidate()) { 8104 return; 8105 } 8106 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8107 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8108 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8109 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8110 mPrivateFlags |= INVALIDATED; 8111 final ViewParent p = mParent; 8112 final AttachInfo ai = mAttachInfo; 8113 //noinspection PointlessBooleanExpression,ConstantConditions 8114 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8115 if (p != null && ai != null && ai.mHardwareAccelerated) { 8116 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8117 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8118 p.invalidateChild(this, null); 8119 return; 8120 } 8121 } 8122 if (p != null && ai != null) { 8123 final int scrollX = mScrollX; 8124 final int scrollY = mScrollY; 8125 final Rect r = ai.mTmpInvalRect; 8126 r.set(dirty.left - scrollX, dirty.top - scrollY, 8127 dirty.right - scrollX, dirty.bottom - scrollY); 8128 mParent.invalidateChild(this, r); 8129 } 8130 } 8131 } 8132 8133 /** 8134 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 8135 * The coordinates of the dirty rect are relative to the view. 8136 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 8137 * will be called at some point in the future. This must be called from 8138 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 8139 * @param l the left position of the dirty region 8140 * @param t the top position of the dirty region 8141 * @param r the right position of the dirty region 8142 * @param b the bottom position of the dirty region 8143 */ 8144 public void invalidate(int l, int t, int r, int b) { 8145 if (ViewDebug.TRACE_HIERARCHY) { 8146 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8147 } 8148 8149 if (skipInvalidate()) { 8150 return; 8151 } 8152 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8153 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8154 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8155 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8156 mPrivateFlags |= INVALIDATED; 8157 final ViewParent p = mParent; 8158 final AttachInfo ai = mAttachInfo; 8159 //noinspection PointlessBooleanExpression,ConstantConditions 8160 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8161 if (p != null && ai != null && ai.mHardwareAccelerated) { 8162 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8163 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8164 p.invalidateChild(this, null); 8165 return; 8166 } 8167 } 8168 if (p != null && ai != null && l < r && t < b) { 8169 final int scrollX = mScrollX; 8170 final int scrollY = mScrollY; 8171 final Rect tmpr = ai.mTmpInvalRect; 8172 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 8173 p.invalidateChild(this, tmpr); 8174 } 8175 } 8176 } 8177 8178 /** 8179 * Invalidate the whole view. If the view is visible, 8180 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 8181 * the future. This must be called from a UI thread. To call from a non-UI thread, 8182 * call {@link #postInvalidate()}. 8183 */ 8184 public void invalidate() { 8185 invalidate(true); 8186 } 8187 8188 /** 8189 * This is where the invalidate() work actually happens. A full invalidate() 8190 * causes the drawing cache to be invalidated, but this function can be called with 8191 * invalidateCache set to false to skip that invalidation step for cases that do not 8192 * need it (for example, a component that remains at the same dimensions with the same 8193 * content). 8194 * 8195 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 8196 * well. This is usually true for a full invalidate, but may be set to false if the 8197 * View's contents or dimensions have not changed. 8198 */ 8199 void invalidate(boolean invalidateCache) { 8200 if (ViewDebug.TRACE_HIERARCHY) { 8201 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8202 } 8203 8204 if (skipInvalidate()) { 8205 return; 8206 } 8207 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8208 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 8209 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 8210 mLastIsOpaque = isOpaque(); 8211 mPrivateFlags &= ~DRAWN; 8212 if (invalidateCache) { 8213 mPrivateFlags |= INVALIDATED; 8214 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8215 } 8216 final AttachInfo ai = mAttachInfo; 8217 final ViewParent p = mParent; 8218 //noinspection PointlessBooleanExpression,ConstantConditions 8219 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8220 if (p != null && ai != null && ai.mHardwareAccelerated) { 8221 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8222 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8223 p.invalidateChild(this, null); 8224 return; 8225 } 8226 } 8227 8228 if (p != null && ai != null) { 8229 final Rect r = ai.mTmpInvalRect; 8230 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8231 // Don't call invalidate -- we don't want to internally scroll 8232 // our own bounds 8233 p.invalidateChild(this, r); 8234 } 8235 } 8236 } 8237 8238 /** 8239 * @hide 8240 */ 8241 public void fastInvalidate() { 8242 if (skipInvalidate()) { 8243 return; 8244 } 8245 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8246 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8247 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8248 if (mParent instanceof View) { 8249 ((View) mParent).mPrivateFlags |= INVALIDATED; 8250 } 8251 mPrivateFlags &= ~DRAWN; 8252 mPrivateFlags |= INVALIDATED; 8253 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8254 if (mParent != null && mAttachInfo != null) { 8255 if (mAttachInfo.mHardwareAccelerated) { 8256 mParent.invalidateChild(this, null); 8257 } else { 8258 final Rect r = mAttachInfo.mTmpInvalRect; 8259 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8260 // Don't call invalidate -- we don't want to internally scroll 8261 // our own bounds 8262 mParent.invalidateChild(this, r); 8263 } 8264 } 8265 } 8266 } 8267 8268 /** 8269 * Used to indicate that the parent of this view should clear its caches. This functionality 8270 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8271 * which is necessary when various parent-managed properties of the view change, such as 8272 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 8273 * clears the parent caches and does not causes an invalidate event. 8274 * 8275 * @hide 8276 */ 8277 protected void invalidateParentCaches() { 8278 if (mParent instanceof View) { 8279 ((View) mParent).mPrivateFlags |= INVALIDATED; 8280 } 8281 } 8282 8283 /** 8284 * Used to indicate that the parent of this view should be invalidated. This functionality 8285 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8286 * which is necessary when various parent-managed properties of the view change, such as 8287 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 8288 * an invalidation event to the parent. 8289 * 8290 * @hide 8291 */ 8292 protected void invalidateParentIfNeeded() { 8293 if (isHardwareAccelerated() && mParent instanceof View) { 8294 ((View) mParent).invalidate(true); 8295 } 8296 } 8297 8298 /** 8299 * Indicates whether this View is opaque. An opaque View guarantees that it will 8300 * draw all the pixels overlapping its bounds using a fully opaque color. 8301 * 8302 * Subclasses of View should override this method whenever possible to indicate 8303 * whether an instance is opaque. Opaque Views are treated in a special way by 8304 * the View hierarchy, possibly allowing it to perform optimizations during 8305 * invalidate/draw passes. 8306 * 8307 * @return True if this View is guaranteed to be fully opaque, false otherwise. 8308 */ 8309 @ViewDebug.ExportedProperty(category = "drawing") 8310 public boolean isOpaque() { 8311 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 8312 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 8313 } 8314 8315 /** 8316 * @hide 8317 */ 8318 protected void computeOpaqueFlags() { 8319 // Opaque if: 8320 // - Has a background 8321 // - Background is opaque 8322 // - Doesn't have scrollbars or scrollbars are inside overlay 8323 8324 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 8325 mPrivateFlags |= OPAQUE_BACKGROUND; 8326 } else { 8327 mPrivateFlags &= ~OPAQUE_BACKGROUND; 8328 } 8329 8330 final int flags = mViewFlags; 8331 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 8332 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 8333 mPrivateFlags |= OPAQUE_SCROLLBARS; 8334 } else { 8335 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 8336 } 8337 } 8338 8339 /** 8340 * @hide 8341 */ 8342 protected boolean hasOpaqueScrollbars() { 8343 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 8344 } 8345 8346 /** 8347 * @return A handler associated with the thread running the View. This 8348 * handler can be used to pump events in the UI events queue. 8349 */ 8350 public Handler getHandler() { 8351 if (mAttachInfo != null) { 8352 return mAttachInfo.mHandler; 8353 } 8354 return null; 8355 } 8356 8357 /** 8358 * <p>Causes the Runnable to be added to the message queue. 8359 * The runnable will be run on the user interface thread.</p> 8360 * 8361 * <p>This method can be invoked from outside of the UI thread 8362 * only when this View is attached to a window.</p> 8363 * 8364 * @param action The Runnable that will be executed. 8365 * 8366 * @return Returns true if the Runnable was successfully placed in to the 8367 * message queue. Returns false on failure, usually because the 8368 * looper processing the message queue is exiting. 8369 */ 8370 public boolean post(Runnable action) { 8371 Handler handler; 8372 AttachInfo attachInfo = mAttachInfo; 8373 if (attachInfo != null) { 8374 handler = attachInfo.mHandler; 8375 } else { 8376 // Assume that post will succeed later 8377 ViewRootImpl.getRunQueue().post(action); 8378 return true; 8379 } 8380 8381 return handler.post(action); 8382 } 8383 8384 /** 8385 * <p>Causes the Runnable to be added to the message queue, to be run 8386 * after the specified amount of time elapses. 8387 * The runnable will be run on the user interface thread.</p> 8388 * 8389 * <p>This method can be invoked from outside of the UI thread 8390 * only when this View is attached to a window.</p> 8391 * 8392 * @param action The Runnable that will be executed. 8393 * @param delayMillis The delay (in milliseconds) until the Runnable 8394 * will be executed. 8395 * 8396 * @return true if the Runnable was successfully placed in to the 8397 * message queue. Returns false on failure, usually because the 8398 * looper processing the message queue is exiting. Note that a 8399 * result of true does not mean the Runnable will be processed -- 8400 * if the looper is quit before the delivery time of the message 8401 * occurs then the message will be dropped. 8402 */ 8403 public boolean postDelayed(Runnable action, long delayMillis) { 8404 Handler handler; 8405 AttachInfo attachInfo = mAttachInfo; 8406 if (attachInfo != null) { 8407 handler = attachInfo.mHandler; 8408 } else { 8409 // Assume that post will succeed later 8410 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8411 return true; 8412 } 8413 8414 return handler.postDelayed(action, delayMillis); 8415 } 8416 8417 /** 8418 * <p>Removes the specified Runnable from the message queue.</p> 8419 * 8420 * <p>This method can be invoked from outside of the UI thread 8421 * only when this View is attached to a window.</p> 8422 * 8423 * @param action The Runnable to remove from the message handling queue 8424 * 8425 * @return true if this view could ask the Handler to remove the Runnable, 8426 * false otherwise. When the returned value is true, the Runnable 8427 * may or may not have been actually removed from the message queue 8428 * (for instance, if the Runnable was not in the queue already.) 8429 */ 8430 public boolean removeCallbacks(Runnable action) { 8431 Handler handler; 8432 AttachInfo attachInfo = mAttachInfo; 8433 if (attachInfo != null) { 8434 handler = attachInfo.mHandler; 8435 } else { 8436 // Assume that post will succeed later 8437 ViewRootImpl.getRunQueue().removeCallbacks(action); 8438 return true; 8439 } 8440 8441 handler.removeCallbacks(action); 8442 return true; 8443 } 8444 8445 /** 8446 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 8447 * Use this to invalidate the View from a non-UI thread.</p> 8448 * 8449 * <p>This method can be invoked from outside of the UI thread 8450 * only when this View is attached to a window.</p> 8451 * 8452 * @see #invalidate() 8453 */ 8454 public void postInvalidate() { 8455 postInvalidateDelayed(0); 8456 } 8457 8458 /** 8459 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8460 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 8461 * 8462 * <p>This method can be invoked from outside of the UI thread 8463 * only when this View is attached to a window.</p> 8464 * 8465 * @param left The left coordinate of the rectangle to invalidate. 8466 * @param top The top coordinate of the rectangle to invalidate. 8467 * @param right The right coordinate of the rectangle to invalidate. 8468 * @param bottom The bottom coordinate of the rectangle to invalidate. 8469 * 8470 * @see #invalidate(int, int, int, int) 8471 * @see #invalidate(Rect) 8472 */ 8473 public void postInvalidate(int left, int top, int right, int bottom) { 8474 postInvalidateDelayed(0, left, top, right, bottom); 8475 } 8476 8477 /** 8478 * <p>Cause an invalidate to happen on a subsequent cycle through the event 8479 * loop. Waits for the specified amount of time.</p> 8480 * 8481 * <p>This method can be invoked from outside of the UI thread 8482 * only when this View is attached to a window.</p> 8483 * 8484 * @param delayMilliseconds the duration in milliseconds to delay the 8485 * invalidation by 8486 */ 8487 public void postInvalidateDelayed(long delayMilliseconds) { 8488 // We try only with the AttachInfo because there's no point in invalidating 8489 // if we are not attached to our window 8490 AttachInfo attachInfo = mAttachInfo; 8491 if (attachInfo != null) { 8492 Message msg = Message.obtain(); 8493 msg.what = AttachInfo.INVALIDATE_MSG; 8494 msg.obj = this; 8495 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8496 } 8497 } 8498 8499 /** 8500 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8501 * through the event loop. Waits for the specified amount of time.</p> 8502 * 8503 * <p>This method can be invoked from outside of the UI thread 8504 * only when this View is attached to a window.</p> 8505 * 8506 * @param delayMilliseconds the duration in milliseconds to delay the 8507 * invalidation by 8508 * @param left The left coordinate of the rectangle to invalidate. 8509 * @param top The top coordinate of the rectangle to invalidate. 8510 * @param right The right coordinate of the rectangle to invalidate. 8511 * @param bottom The bottom coordinate of the rectangle to invalidate. 8512 */ 8513 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8514 int right, int bottom) { 8515 8516 // We try only with the AttachInfo because there's no point in invalidating 8517 // if we are not attached to our window 8518 AttachInfo attachInfo = mAttachInfo; 8519 if (attachInfo != null) { 8520 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8521 info.target = this; 8522 info.left = left; 8523 info.top = top; 8524 info.right = right; 8525 info.bottom = bottom; 8526 8527 final Message msg = Message.obtain(); 8528 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 8529 msg.obj = info; 8530 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8531 } 8532 } 8533 8534 /** 8535 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 8536 * This event is sent at most once every 8537 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 8538 */ 8539 private void postSendViewScrolledAccessibilityEventCallback() { 8540 if (mSendViewScrolledAccessibilityEvent == null) { 8541 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 8542 } 8543 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 8544 mSendViewScrolledAccessibilityEvent.mIsPending = true; 8545 postDelayed(mSendViewScrolledAccessibilityEvent, 8546 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 8547 } 8548 } 8549 8550 /** 8551 * Called by a parent to request that a child update its values for mScrollX 8552 * and mScrollY if necessary. This will typically be done if the child is 8553 * animating a scroll using a {@link android.widget.Scroller Scroller} 8554 * object. 8555 */ 8556 public void computeScroll() { 8557 } 8558 8559 /** 8560 * <p>Indicate whether the horizontal edges are faded when the view is 8561 * scrolled horizontally.</p> 8562 * 8563 * @return true if the horizontal edges should are faded on scroll, false 8564 * otherwise 8565 * 8566 * @see #setHorizontalFadingEdgeEnabled(boolean) 8567 * @attr ref android.R.styleable#View_fadingEdge 8568 */ 8569 public boolean isHorizontalFadingEdgeEnabled() { 8570 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 8571 } 8572 8573 /** 8574 * <p>Define whether the horizontal edges should be faded when this view 8575 * is scrolled horizontally.</p> 8576 * 8577 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 8578 * be faded when the view is scrolled 8579 * horizontally 8580 * 8581 * @see #isHorizontalFadingEdgeEnabled() 8582 * @attr ref android.R.styleable#View_fadingEdge 8583 */ 8584 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 8585 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 8586 if (horizontalFadingEdgeEnabled) { 8587 initScrollCache(); 8588 } 8589 8590 mViewFlags ^= FADING_EDGE_HORIZONTAL; 8591 } 8592 } 8593 8594 /** 8595 * <p>Indicate whether the vertical edges are faded when the view is 8596 * scrolled horizontally.</p> 8597 * 8598 * @return true if the vertical edges should are faded on scroll, false 8599 * otherwise 8600 * 8601 * @see #setVerticalFadingEdgeEnabled(boolean) 8602 * @attr ref android.R.styleable#View_fadingEdge 8603 */ 8604 public boolean isVerticalFadingEdgeEnabled() { 8605 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 8606 } 8607 8608 /** 8609 * <p>Define whether the vertical edges should be faded when this view 8610 * is scrolled vertically.</p> 8611 * 8612 * @param verticalFadingEdgeEnabled true if the vertical edges should 8613 * be faded when the view is scrolled 8614 * vertically 8615 * 8616 * @see #isVerticalFadingEdgeEnabled() 8617 * @attr ref android.R.styleable#View_fadingEdge 8618 */ 8619 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 8620 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 8621 if (verticalFadingEdgeEnabled) { 8622 initScrollCache(); 8623 } 8624 8625 mViewFlags ^= FADING_EDGE_VERTICAL; 8626 } 8627 } 8628 8629 /** 8630 * Returns the strength, or intensity, of the top faded edge. The strength is 8631 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8632 * returns 0.0 or 1.0 but no value in between. 8633 * 8634 * Subclasses should override this method to provide a smoother fade transition 8635 * when scrolling occurs. 8636 * 8637 * @return the intensity of the top fade as a float between 0.0f and 1.0f 8638 */ 8639 protected float getTopFadingEdgeStrength() { 8640 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 8641 } 8642 8643 /** 8644 * Returns the strength, or intensity, of the bottom faded edge. The strength is 8645 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8646 * returns 0.0 or 1.0 but no value in between. 8647 * 8648 * Subclasses should override this method to provide a smoother fade transition 8649 * when scrolling occurs. 8650 * 8651 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 8652 */ 8653 protected float getBottomFadingEdgeStrength() { 8654 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 8655 computeVerticalScrollRange() ? 1.0f : 0.0f; 8656 } 8657 8658 /** 8659 * Returns the strength, or intensity, of the left faded edge. The strength is 8660 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8661 * returns 0.0 or 1.0 but no value in between. 8662 * 8663 * Subclasses should override this method to provide a smoother fade transition 8664 * when scrolling occurs. 8665 * 8666 * @return the intensity of the left fade as a float between 0.0f and 1.0f 8667 */ 8668 protected float getLeftFadingEdgeStrength() { 8669 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 8670 } 8671 8672 /** 8673 * Returns the strength, or intensity, of the right faded edge. The strength is 8674 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8675 * returns 0.0 or 1.0 but no value in between. 8676 * 8677 * Subclasses should override this method to provide a smoother fade transition 8678 * when scrolling occurs. 8679 * 8680 * @return the intensity of the right fade as a float between 0.0f and 1.0f 8681 */ 8682 protected float getRightFadingEdgeStrength() { 8683 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 8684 computeHorizontalScrollRange() ? 1.0f : 0.0f; 8685 } 8686 8687 /** 8688 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 8689 * scrollbar is not drawn by default.</p> 8690 * 8691 * @return true if the horizontal scrollbar should be painted, false 8692 * otherwise 8693 * 8694 * @see #setHorizontalScrollBarEnabled(boolean) 8695 */ 8696 public boolean isHorizontalScrollBarEnabled() { 8697 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 8698 } 8699 8700 /** 8701 * <p>Define whether the horizontal scrollbar should be drawn or not. The 8702 * scrollbar is not drawn by default.</p> 8703 * 8704 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 8705 * be painted 8706 * 8707 * @see #isHorizontalScrollBarEnabled() 8708 */ 8709 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 8710 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 8711 mViewFlags ^= SCROLLBARS_HORIZONTAL; 8712 computeOpaqueFlags(); 8713 resolvePadding(); 8714 } 8715 } 8716 8717 /** 8718 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 8719 * scrollbar is not drawn by default.</p> 8720 * 8721 * @return true if the vertical scrollbar should be painted, false 8722 * otherwise 8723 * 8724 * @see #setVerticalScrollBarEnabled(boolean) 8725 */ 8726 public boolean isVerticalScrollBarEnabled() { 8727 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 8728 } 8729 8730 /** 8731 * <p>Define whether the vertical scrollbar should be drawn or not. The 8732 * scrollbar is not drawn by default.</p> 8733 * 8734 * @param verticalScrollBarEnabled true if the vertical scrollbar should 8735 * be painted 8736 * 8737 * @see #isVerticalScrollBarEnabled() 8738 */ 8739 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 8740 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 8741 mViewFlags ^= SCROLLBARS_VERTICAL; 8742 computeOpaqueFlags(); 8743 resolvePadding(); 8744 } 8745 } 8746 8747 /** 8748 * @hide 8749 */ 8750 protected void recomputePadding() { 8751 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 8752 } 8753 8754 /** 8755 * Define whether scrollbars will fade when the view is not scrolling. 8756 * 8757 * @param fadeScrollbars wheter to enable fading 8758 * 8759 */ 8760 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 8761 initScrollCache(); 8762 final ScrollabilityCache scrollabilityCache = mScrollCache; 8763 scrollabilityCache.fadeScrollBars = fadeScrollbars; 8764 if (fadeScrollbars) { 8765 scrollabilityCache.state = ScrollabilityCache.OFF; 8766 } else { 8767 scrollabilityCache.state = ScrollabilityCache.ON; 8768 } 8769 } 8770 8771 /** 8772 * 8773 * Returns true if scrollbars will fade when this view is not scrolling 8774 * 8775 * @return true if scrollbar fading is enabled 8776 */ 8777 public boolean isScrollbarFadingEnabled() { 8778 return mScrollCache != null && mScrollCache.fadeScrollBars; 8779 } 8780 8781 /** 8782 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 8783 * inset. When inset, they add to the padding of the view. And the scrollbars 8784 * can be drawn inside the padding area or on the edge of the view. For example, 8785 * if a view has a background drawable and you want to draw the scrollbars 8786 * inside the padding specified by the drawable, you can use 8787 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 8788 * appear at the edge of the view, ignoring the padding, then you can use 8789 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 8790 * @param style the style of the scrollbars. Should be one of 8791 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 8792 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 8793 * @see #SCROLLBARS_INSIDE_OVERLAY 8794 * @see #SCROLLBARS_INSIDE_INSET 8795 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8796 * @see #SCROLLBARS_OUTSIDE_INSET 8797 */ 8798 public void setScrollBarStyle(int style) { 8799 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 8800 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 8801 computeOpaqueFlags(); 8802 resolvePadding(); 8803 } 8804 } 8805 8806 /** 8807 * <p>Returns the current scrollbar style.</p> 8808 * @return the current scrollbar style 8809 * @see #SCROLLBARS_INSIDE_OVERLAY 8810 * @see #SCROLLBARS_INSIDE_INSET 8811 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8812 * @see #SCROLLBARS_OUTSIDE_INSET 8813 */ 8814 @ViewDebug.ExportedProperty(mapping = { 8815 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 8816 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 8817 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 8818 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 8819 }) 8820 public int getScrollBarStyle() { 8821 return mViewFlags & SCROLLBARS_STYLE_MASK; 8822 } 8823 8824 /** 8825 * <p>Compute the horizontal range that the horizontal scrollbar 8826 * represents.</p> 8827 * 8828 * <p>The range is expressed in arbitrary units that must be the same as the 8829 * units used by {@link #computeHorizontalScrollExtent()} and 8830 * {@link #computeHorizontalScrollOffset()}.</p> 8831 * 8832 * <p>The default range is the drawing width of this view.</p> 8833 * 8834 * @return the total horizontal range represented by the horizontal 8835 * scrollbar 8836 * 8837 * @see #computeHorizontalScrollExtent() 8838 * @see #computeHorizontalScrollOffset() 8839 * @see android.widget.ScrollBarDrawable 8840 */ 8841 protected int computeHorizontalScrollRange() { 8842 return getWidth(); 8843 } 8844 8845 /** 8846 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 8847 * within the horizontal range. This value is used to compute the position 8848 * of the thumb within the scrollbar's track.</p> 8849 * 8850 * <p>The range is expressed in arbitrary units that must be the same as the 8851 * units used by {@link #computeHorizontalScrollRange()} and 8852 * {@link #computeHorizontalScrollExtent()}.</p> 8853 * 8854 * <p>The default offset is the scroll offset of this view.</p> 8855 * 8856 * @return the horizontal offset of the scrollbar's thumb 8857 * 8858 * @see #computeHorizontalScrollRange() 8859 * @see #computeHorizontalScrollExtent() 8860 * @see android.widget.ScrollBarDrawable 8861 */ 8862 protected int computeHorizontalScrollOffset() { 8863 return mScrollX; 8864 } 8865 8866 /** 8867 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 8868 * within the horizontal range. This value is used to compute the length 8869 * of the thumb within the scrollbar's track.</p> 8870 * 8871 * <p>The range is expressed in arbitrary units that must be the same as the 8872 * units used by {@link #computeHorizontalScrollRange()} and 8873 * {@link #computeHorizontalScrollOffset()}.</p> 8874 * 8875 * <p>The default extent is the drawing width of this view.</p> 8876 * 8877 * @return the horizontal extent of the scrollbar's thumb 8878 * 8879 * @see #computeHorizontalScrollRange() 8880 * @see #computeHorizontalScrollOffset() 8881 * @see android.widget.ScrollBarDrawable 8882 */ 8883 protected int computeHorizontalScrollExtent() { 8884 return getWidth(); 8885 } 8886 8887 /** 8888 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 8889 * 8890 * <p>The range is expressed in arbitrary units that must be the same as the 8891 * units used by {@link #computeVerticalScrollExtent()} and 8892 * {@link #computeVerticalScrollOffset()}.</p> 8893 * 8894 * @return the total vertical range represented by the vertical scrollbar 8895 * 8896 * <p>The default range is the drawing height of this view.</p> 8897 * 8898 * @see #computeVerticalScrollExtent() 8899 * @see #computeVerticalScrollOffset() 8900 * @see android.widget.ScrollBarDrawable 8901 */ 8902 protected int computeVerticalScrollRange() { 8903 return getHeight(); 8904 } 8905 8906 /** 8907 * <p>Compute the vertical offset of the vertical scrollbar's thumb 8908 * within the horizontal range. This value is used to compute the position 8909 * of the thumb within the scrollbar's track.</p> 8910 * 8911 * <p>The range is expressed in arbitrary units that must be the same as the 8912 * units used by {@link #computeVerticalScrollRange()} and 8913 * {@link #computeVerticalScrollExtent()}.</p> 8914 * 8915 * <p>The default offset is the scroll offset of this view.</p> 8916 * 8917 * @return the vertical offset of the scrollbar's thumb 8918 * 8919 * @see #computeVerticalScrollRange() 8920 * @see #computeVerticalScrollExtent() 8921 * @see android.widget.ScrollBarDrawable 8922 */ 8923 protected int computeVerticalScrollOffset() { 8924 return mScrollY; 8925 } 8926 8927 /** 8928 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 8929 * within the vertical range. This value is used to compute the length 8930 * of the thumb within the scrollbar's track.</p> 8931 * 8932 * <p>The range is expressed in arbitrary units that must be the same as the 8933 * units used by {@link #computeVerticalScrollRange()} and 8934 * {@link #computeVerticalScrollOffset()}.</p> 8935 * 8936 * <p>The default extent is the drawing height of this view.</p> 8937 * 8938 * @return the vertical extent of the scrollbar's thumb 8939 * 8940 * @see #computeVerticalScrollRange() 8941 * @see #computeVerticalScrollOffset() 8942 * @see android.widget.ScrollBarDrawable 8943 */ 8944 protected int computeVerticalScrollExtent() { 8945 return getHeight(); 8946 } 8947 8948 /** 8949 * Check if this view can be scrolled horizontally in a certain direction. 8950 * 8951 * @param direction Negative to check scrolling left, positive to check scrolling right. 8952 * @return true if this view can be scrolled in the specified direction, false otherwise. 8953 */ 8954 public boolean canScrollHorizontally(int direction) { 8955 final int offset = computeHorizontalScrollOffset(); 8956 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 8957 if (range == 0) return false; 8958 if (direction < 0) { 8959 return offset > 0; 8960 } else { 8961 return offset < range - 1; 8962 } 8963 } 8964 8965 /** 8966 * Check if this view can be scrolled vertically in a certain direction. 8967 * 8968 * @param direction Negative to check scrolling up, positive to check scrolling down. 8969 * @return true if this view can be scrolled in the specified direction, false otherwise. 8970 */ 8971 public boolean canScrollVertically(int direction) { 8972 final int offset = computeVerticalScrollOffset(); 8973 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 8974 if (range == 0) return false; 8975 if (direction < 0) { 8976 return offset > 0; 8977 } else { 8978 return offset < range - 1; 8979 } 8980 } 8981 8982 /** 8983 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 8984 * scrollbars are painted only if they have been awakened first.</p> 8985 * 8986 * @param canvas the canvas on which to draw the scrollbars 8987 * 8988 * @see #awakenScrollBars(int) 8989 */ 8990 protected final void onDrawScrollBars(Canvas canvas) { 8991 // scrollbars are drawn only when the animation is running 8992 final ScrollabilityCache cache = mScrollCache; 8993 if (cache != null) { 8994 8995 int state = cache.state; 8996 8997 if (state == ScrollabilityCache.OFF) { 8998 return; 8999 } 9000 9001 boolean invalidate = false; 9002 9003 if (state == ScrollabilityCache.FADING) { 9004 // We're fading -- get our fade interpolation 9005 if (cache.interpolatorValues == null) { 9006 cache.interpolatorValues = new float[1]; 9007 } 9008 9009 float[] values = cache.interpolatorValues; 9010 9011 // Stops the animation if we're done 9012 if (cache.scrollBarInterpolator.timeToValues(values) == 9013 Interpolator.Result.FREEZE_END) { 9014 cache.state = ScrollabilityCache.OFF; 9015 } else { 9016 cache.scrollBar.setAlpha(Math.round(values[0])); 9017 } 9018 9019 // This will make the scroll bars inval themselves after 9020 // drawing. We only want this when we're fading so that 9021 // we prevent excessive redraws 9022 invalidate = true; 9023 } else { 9024 // We're just on -- but we may have been fading before so 9025 // reset alpha 9026 cache.scrollBar.setAlpha(255); 9027 } 9028 9029 9030 final int viewFlags = mViewFlags; 9031 9032 final boolean drawHorizontalScrollBar = 9033 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9034 final boolean drawVerticalScrollBar = 9035 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 9036 && !isVerticalScrollBarHidden(); 9037 9038 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 9039 final int width = mRight - mLeft; 9040 final int height = mBottom - mTop; 9041 9042 final ScrollBarDrawable scrollBar = cache.scrollBar; 9043 9044 final int scrollX = mScrollX; 9045 final int scrollY = mScrollY; 9046 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 9047 9048 int left, top, right, bottom; 9049 9050 if (drawHorizontalScrollBar) { 9051 int size = scrollBar.getSize(false); 9052 if (size <= 0) { 9053 size = cache.scrollBarSize; 9054 } 9055 9056 scrollBar.setParameters(computeHorizontalScrollRange(), 9057 computeHorizontalScrollOffset(), 9058 computeHorizontalScrollExtent(), false); 9059 final int verticalScrollBarGap = drawVerticalScrollBar ? 9060 getVerticalScrollbarWidth() : 0; 9061 top = scrollY + height - size - (mUserPaddingBottom & inside); 9062 left = scrollX + (mPaddingLeft & inside); 9063 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 9064 bottom = top + size; 9065 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 9066 if (invalidate) { 9067 invalidate(left, top, right, bottom); 9068 } 9069 } 9070 9071 if (drawVerticalScrollBar) { 9072 int size = scrollBar.getSize(true); 9073 if (size <= 0) { 9074 size = cache.scrollBarSize; 9075 } 9076 9077 scrollBar.setParameters(computeVerticalScrollRange(), 9078 computeVerticalScrollOffset(), 9079 computeVerticalScrollExtent(), true); 9080 switch (mVerticalScrollbarPosition) { 9081 default: 9082 case SCROLLBAR_POSITION_DEFAULT: 9083 case SCROLLBAR_POSITION_RIGHT: 9084 left = scrollX + width - size - (mUserPaddingRight & inside); 9085 break; 9086 case SCROLLBAR_POSITION_LEFT: 9087 left = scrollX + (mUserPaddingLeft & inside); 9088 break; 9089 } 9090 top = scrollY + (mPaddingTop & inside); 9091 right = left + size; 9092 bottom = scrollY + height - (mUserPaddingBottom & inside); 9093 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 9094 if (invalidate) { 9095 invalidate(left, top, right, bottom); 9096 } 9097 } 9098 } 9099 } 9100 } 9101 9102 /** 9103 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 9104 * FastScroller is visible. 9105 * @return whether to temporarily hide the vertical scrollbar 9106 * @hide 9107 */ 9108 protected boolean isVerticalScrollBarHidden() { 9109 return false; 9110 } 9111 9112 /** 9113 * <p>Draw the horizontal scrollbar if 9114 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 9115 * 9116 * @param canvas the canvas on which to draw the scrollbar 9117 * @param scrollBar the scrollbar's drawable 9118 * 9119 * @see #isHorizontalScrollBarEnabled() 9120 * @see #computeHorizontalScrollRange() 9121 * @see #computeHorizontalScrollExtent() 9122 * @see #computeHorizontalScrollOffset() 9123 * @see android.widget.ScrollBarDrawable 9124 * @hide 9125 */ 9126 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 9127 int l, int t, int r, int b) { 9128 scrollBar.setBounds(l, t, r, b); 9129 scrollBar.draw(canvas); 9130 } 9131 9132 /** 9133 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 9134 * returns true.</p> 9135 * 9136 * @param canvas the canvas on which to draw the scrollbar 9137 * @param scrollBar the scrollbar's drawable 9138 * 9139 * @see #isVerticalScrollBarEnabled() 9140 * @see #computeVerticalScrollRange() 9141 * @see #computeVerticalScrollExtent() 9142 * @see #computeVerticalScrollOffset() 9143 * @see android.widget.ScrollBarDrawable 9144 * @hide 9145 */ 9146 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 9147 int l, int t, int r, int b) { 9148 scrollBar.setBounds(l, t, r, b); 9149 scrollBar.draw(canvas); 9150 } 9151 9152 /** 9153 * Implement this to do your drawing. 9154 * 9155 * @param canvas the canvas on which the background will be drawn 9156 */ 9157 protected void onDraw(Canvas canvas) { 9158 } 9159 9160 /* 9161 * Caller is responsible for calling requestLayout if necessary. 9162 * (This allows addViewInLayout to not request a new layout.) 9163 */ 9164 void assignParent(ViewParent parent) { 9165 if (mParent == null) { 9166 mParent = parent; 9167 } else if (parent == null) { 9168 mParent = null; 9169 } else { 9170 throw new RuntimeException("view " + this + " being added, but" 9171 + " it already has a parent"); 9172 } 9173 } 9174 9175 /** 9176 * This is called when the view is attached to a window. At this point it 9177 * has a Surface and will start drawing. Note that this function is 9178 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 9179 * however it may be called any time before the first onDraw -- including 9180 * before or after {@link #onMeasure(int, int)}. 9181 * 9182 * @see #onDetachedFromWindow() 9183 */ 9184 protected void onAttachedToWindow() { 9185 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 9186 mParent.requestTransparentRegion(this); 9187 } 9188 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 9189 initialAwakenScrollBars(); 9190 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 9191 } 9192 jumpDrawablesToCurrentState(); 9193 // Order is important here: LayoutDirection MUST be resolved before Padding 9194 // and TextDirection 9195 resolveLayoutDirectionIfNeeded(); 9196 resolvePadding(); 9197 resolveTextDirection(); 9198 if (isFocused()) { 9199 InputMethodManager imm = InputMethodManager.peekInstance(); 9200 imm.focusIn(this); 9201 } 9202 } 9203 9204 /** 9205 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 9206 * that the parent directionality can and will be resolved before its children. 9207 */ 9208 private void resolveLayoutDirectionIfNeeded() { 9209 // Do not resolve if it is not needed 9210 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return; 9211 9212 // Clear any previous layout direction resolution 9213 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_RTL; 9214 9215 // Reset also TextDirection as a change into LayoutDirection may impact the selected 9216 // TextDirectionHeuristic 9217 resetResolvedTextDirection(); 9218 9219 // Set resolved depending on layout direction 9220 switch (getLayoutDirection()) { 9221 case LAYOUT_DIRECTION_INHERIT: 9222 // We cannot do the resolution if there is no parent 9223 if (mParent == null) return; 9224 9225 // If this is root view, no need to look at parent's layout dir. 9226 if (mParent instanceof ViewGroup) { 9227 ViewGroup viewGroup = ((ViewGroup) mParent); 9228 9229 // Check if the parent view group can resolve 9230 if (! viewGroup.canResolveLayoutDirection()) { 9231 return; 9232 } 9233 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 9234 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9235 } 9236 } 9237 break; 9238 case LAYOUT_DIRECTION_RTL: 9239 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9240 break; 9241 case LAYOUT_DIRECTION_LOCALE: 9242 if(isLayoutDirectionRtl(Locale.getDefault())) { 9243 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9244 } 9245 break; 9246 default: 9247 // Nothing to do, LTR by default 9248 } 9249 9250 // Set to resolved 9251 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 9252 } 9253 9254 /** 9255 * @hide 9256 */ 9257 protected void resolvePadding() { 9258 // If the user specified the absolute padding (either with android:padding or 9259 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 9260 // use the default padding or the padding from the background drawable 9261 // (stored at this point in mPadding*) 9262 switch (getResolvedLayoutDirection()) { 9263 case LAYOUT_DIRECTION_RTL: 9264 // Start user padding override Right user padding. Otherwise, if Right user 9265 // padding is not defined, use the default Right padding. If Right user padding 9266 // is defined, just use it. 9267 if (mUserPaddingStart >= 0) { 9268 mUserPaddingRight = mUserPaddingStart; 9269 } else if (mUserPaddingRight < 0) { 9270 mUserPaddingRight = mPaddingRight; 9271 } 9272 if (mUserPaddingEnd >= 0) { 9273 mUserPaddingLeft = mUserPaddingEnd; 9274 } else if (mUserPaddingLeft < 0) { 9275 mUserPaddingLeft = mPaddingLeft; 9276 } 9277 break; 9278 case LAYOUT_DIRECTION_LTR: 9279 default: 9280 // Start user padding override Left user padding. Otherwise, if Left user 9281 // padding is not defined, use the default left padding. If Left user padding 9282 // is defined, just use it. 9283 if (mUserPaddingStart >= 0) { 9284 mUserPaddingLeft = mUserPaddingStart; 9285 } else if (mUserPaddingLeft < 0) { 9286 mUserPaddingLeft = mPaddingLeft; 9287 } 9288 if (mUserPaddingEnd >= 0) { 9289 mUserPaddingRight = mUserPaddingEnd; 9290 } else if (mUserPaddingRight < 0) { 9291 mUserPaddingRight = mPaddingRight; 9292 } 9293 } 9294 9295 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 9296 9297 recomputePadding(); 9298 } 9299 9300 /** 9301 * Return true if layout direction resolution can be done 9302 * 9303 * @hide 9304 */ 9305 protected boolean canResolveLayoutDirection() { 9306 switch (getLayoutDirection()) { 9307 case LAYOUT_DIRECTION_INHERIT: 9308 return (mParent != null); 9309 default: 9310 return true; 9311 } 9312 } 9313 9314 /** 9315 * Reset the resolved layout direction. 9316 * 9317 * Subclasses need to override this method to clear cached information that depends on the 9318 * resolved layout direction, or to inform child views that inherit their layout direction. 9319 * Overrides must also call the superclass implementation at the start of their implementation. 9320 * 9321 * @hide 9322 */ 9323 protected void resetResolvedLayoutDirection() { 9324 // Reset the current View resolution 9325 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED; 9326 } 9327 9328 /** 9329 * Check if a Locale is corresponding to a RTL script. 9330 * 9331 * @param locale Locale to check 9332 * @return true if a Locale is corresponding to a RTL script. 9333 * 9334 * @hide 9335 */ 9336 protected static boolean isLayoutDirectionRtl(Locale locale) { 9337 return (LocaleUtil.TEXT_LAYOUT_DIRECTION_RTL_DO_NOT_USE == 9338 LocaleUtil.getLayoutDirectionFromLocale(locale)); 9339 } 9340 9341 /** 9342 * This is called when the view is detached from a window. At this point it 9343 * no longer has a surface for drawing. 9344 * 9345 * @see #onAttachedToWindow() 9346 */ 9347 protected void onDetachedFromWindow() { 9348 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 9349 9350 removeUnsetPressCallback(); 9351 removeLongPressCallback(); 9352 removePerformClickCallback(); 9353 removeSendViewScrolledAccessibilityEventCallback(); 9354 9355 destroyDrawingCache(); 9356 9357 destroyLayer(); 9358 9359 if (mDisplayList != null) { 9360 mDisplayList.invalidate(); 9361 } 9362 9363 if (mAttachInfo != null) { 9364 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 9365 } 9366 9367 mCurrentAnimation = null; 9368 9369 resetResolvedLayoutDirection(); 9370 resetResolvedTextDirection(); 9371 } 9372 9373 /** 9374 * @return The number of times this view has been attached to a window 9375 */ 9376 protected int getWindowAttachCount() { 9377 return mWindowAttachCount; 9378 } 9379 9380 /** 9381 * Retrieve a unique token identifying the window this view is attached to. 9382 * @return Return the window's token for use in 9383 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 9384 */ 9385 public IBinder getWindowToken() { 9386 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 9387 } 9388 9389 /** 9390 * Retrieve a unique token identifying the top-level "real" window of 9391 * the window that this view is attached to. That is, this is like 9392 * {@link #getWindowToken}, except if the window this view in is a panel 9393 * window (attached to another containing window), then the token of 9394 * the containing window is returned instead. 9395 * 9396 * @return Returns the associated window token, either 9397 * {@link #getWindowToken()} or the containing window's token. 9398 */ 9399 public IBinder getApplicationWindowToken() { 9400 AttachInfo ai = mAttachInfo; 9401 if (ai != null) { 9402 IBinder appWindowToken = ai.mPanelParentWindowToken; 9403 if (appWindowToken == null) { 9404 appWindowToken = ai.mWindowToken; 9405 } 9406 return appWindowToken; 9407 } 9408 return null; 9409 } 9410 9411 /** 9412 * Retrieve private session object this view hierarchy is using to 9413 * communicate with the window manager. 9414 * @return the session object to communicate with the window manager 9415 */ 9416 /*package*/ IWindowSession getWindowSession() { 9417 return mAttachInfo != null ? mAttachInfo.mSession : null; 9418 } 9419 9420 /** 9421 * @param info the {@link android.view.View.AttachInfo} to associated with 9422 * this view 9423 */ 9424 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 9425 //System.out.println("Attached! " + this); 9426 mAttachInfo = info; 9427 mWindowAttachCount++; 9428 // We will need to evaluate the drawable state at least once. 9429 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9430 if (mFloatingTreeObserver != null) { 9431 info.mTreeObserver.merge(mFloatingTreeObserver); 9432 mFloatingTreeObserver = null; 9433 } 9434 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 9435 mAttachInfo.mScrollContainers.add(this); 9436 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 9437 } 9438 performCollectViewAttributes(visibility); 9439 onAttachedToWindow(); 9440 9441 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9442 mOnAttachStateChangeListeners; 9443 if (listeners != null && listeners.size() > 0) { 9444 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9445 // perform the dispatching. The iterator is a safe guard against listeners that 9446 // could mutate the list by calling the various add/remove methods. This prevents 9447 // the array from being modified while we iterate it. 9448 for (OnAttachStateChangeListener listener : listeners) { 9449 listener.onViewAttachedToWindow(this); 9450 } 9451 } 9452 9453 int vis = info.mWindowVisibility; 9454 if (vis != GONE) { 9455 onWindowVisibilityChanged(vis); 9456 } 9457 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 9458 // If nobody has evaluated the drawable state yet, then do it now. 9459 refreshDrawableState(); 9460 } 9461 } 9462 9463 void dispatchDetachedFromWindow() { 9464 AttachInfo info = mAttachInfo; 9465 if (info != null) { 9466 int vis = info.mWindowVisibility; 9467 if (vis != GONE) { 9468 onWindowVisibilityChanged(GONE); 9469 } 9470 } 9471 9472 onDetachedFromWindow(); 9473 9474 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9475 mOnAttachStateChangeListeners; 9476 if (listeners != null && listeners.size() > 0) { 9477 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9478 // perform the dispatching. The iterator is a safe guard against listeners that 9479 // could mutate the list by calling the various add/remove methods. This prevents 9480 // the array from being modified while we iterate it. 9481 for (OnAttachStateChangeListener listener : listeners) { 9482 listener.onViewDetachedFromWindow(this); 9483 } 9484 } 9485 9486 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 9487 mAttachInfo.mScrollContainers.remove(this); 9488 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 9489 } 9490 9491 mAttachInfo = null; 9492 } 9493 9494 /** 9495 * Store this view hierarchy's frozen state into the given container. 9496 * 9497 * @param container The SparseArray in which to save the view's state. 9498 * 9499 * @see #restoreHierarchyState(android.util.SparseArray) 9500 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9501 * @see #onSaveInstanceState() 9502 */ 9503 public void saveHierarchyState(SparseArray<Parcelable> container) { 9504 dispatchSaveInstanceState(container); 9505 } 9506 9507 /** 9508 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 9509 * this view and its children. May be overridden to modify how freezing happens to a 9510 * view's children; for example, some views may want to not store state for their children. 9511 * 9512 * @param container The SparseArray in which to save the view's state. 9513 * 9514 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9515 * @see #saveHierarchyState(android.util.SparseArray) 9516 * @see #onSaveInstanceState() 9517 */ 9518 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 9519 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 9520 mPrivateFlags &= ~SAVE_STATE_CALLED; 9521 Parcelable state = onSaveInstanceState(); 9522 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9523 throw new IllegalStateException( 9524 "Derived class did not call super.onSaveInstanceState()"); 9525 } 9526 if (state != null) { 9527 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 9528 // + ": " + state); 9529 container.put(mID, state); 9530 } 9531 } 9532 } 9533 9534 /** 9535 * Hook allowing a view to generate a representation of its internal state 9536 * that can later be used to create a new instance with that same state. 9537 * This state should only contain information that is not persistent or can 9538 * not be reconstructed later. For example, you will never store your 9539 * current position on screen because that will be computed again when a 9540 * new instance of the view is placed in its view hierarchy. 9541 * <p> 9542 * Some examples of things you may store here: the current cursor position 9543 * in a text view (but usually not the text itself since that is stored in a 9544 * content provider or other persistent storage), the currently selected 9545 * item in a list view. 9546 * 9547 * @return Returns a Parcelable object containing the view's current dynamic 9548 * state, or null if there is nothing interesting to save. The 9549 * default implementation returns null. 9550 * @see #onRestoreInstanceState(android.os.Parcelable) 9551 * @see #saveHierarchyState(android.util.SparseArray) 9552 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9553 * @see #setSaveEnabled(boolean) 9554 */ 9555 protected Parcelable onSaveInstanceState() { 9556 mPrivateFlags |= SAVE_STATE_CALLED; 9557 return BaseSavedState.EMPTY_STATE; 9558 } 9559 9560 /** 9561 * Restore this view hierarchy's frozen state from the given container. 9562 * 9563 * @param container The SparseArray which holds previously frozen states. 9564 * 9565 * @see #saveHierarchyState(android.util.SparseArray) 9566 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9567 * @see #onRestoreInstanceState(android.os.Parcelable) 9568 */ 9569 public void restoreHierarchyState(SparseArray<Parcelable> container) { 9570 dispatchRestoreInstanceState(container); 9571 } 9572 9573 /** 9574 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 9575 * state for this view and its children. May be overridden to modify how restoring 9576 * happens to a view's children; for example, some views may want to not store state 9577 * for their children. 9578 * 9579 * @param container The SparseArray which holds previously saved state. 9580 * 9581 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9582 * @see #restoreHierarchyState(android.util.SparseArray) 9583 * @see #onRestoreInstanceState(android.os.Parcelable) 9584 */ 9585 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 9586 if (mID != NO_ID) { 9587 Parcelable state = container.get(mID); 9588 if (state != null) { 9589 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 9590 // + ": " + state); 9591 mPrivateFlags &= ~SAVE_STATE_CALLED; 9592 onRestoreInstanceState(state); 9593 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9594 throw new IllegalStateException( 9595 "Derived class did not call super.onRestoreInstanceState()"); 9596 } 9597 } 9598 } 9599 } 9600 9601 /** 9602 * Hook allowing a view to re-apply a representation of its internal state that had previously 9603 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 9604 * null state. 9605 * 9606 * @param state The frozen state that had previously been returned by 9607 * {@link #onSaveInstanceState}. 9608 * 9609 * @see #onSaveInstanceState() 9610 * @see #restoreHierarchyState(android.util.SparseArray) 9611 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9612 */ 9613 protected void onRestoreInstanceState(Parcelable state) { 9614 mPrivateFlags |= SAVE_STATE_CALLED; 9615 if (state != BaseSavedState.EMPTY_STATE && state != null) { 9616 throw new IllegalArgumentException("Wrong state class, expecting View State but " 9617 + "received " + state.getClass().toString() + " instead. This usually happens " 9618 + "when two views of different type have the same id in the same hierarchy. " 9619 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 9620 + "other views do not use the same id."); 9621 } 9622 } 9623 9624 /** 9625 * <p>Return the time at which the drawing of the view hierarchy started.</p> 9626 * 9627 * @return the drawing start time in milliseconds 9628 */ 9629 public long getDrawingTime() { 9630 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 9631 } 9632 9633 /** 9634 * <p>Enables or disables the duplication of the parent's state into this view. When 9635 * duplication is enabled, this view gets its drawable state from its parent rather 9636 * than from its own internal properties.</p> 9637 * 9638 * <p>Note: in the current implementation, setting this property to true after the 9639 * view was added to a ViewGroup might have no effect at all. This property should 9640 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 9641 * 9642 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 9643 * property is enabled, an exception will be thrown.</p> 9644 * 9645 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 9646 * parent, these states should not be affected by this method.</p> 9647 * 9648 * @param enabled True to enable duplication of the parent's drawable state, false 9649 * to disable it. 9650 * 9651 * @see #getDrawableState() 9652 * @see #isDuplicateParentStateEnabled() 9653 */ 9654 public void setDuplicateParentStateEnabled(boolean enabled) { 9655 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 9656 } 9657 9658 /** 9659 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 9660 * 9661 * @return True if this view's drawable state is duplicated from the parent, 9662 * false otherwise 9663 * 9664 * @see #getDrawableState() 9665 * @see #setDuplicateParentStateEnabled(boolean) 9666 */ 9667 public boolean isDuplicateParentStateEnabled() { 9668 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 9669 } 9670 9671 /** 9672 * <p>Specifies the type of layer backing this view. The layer can be 9673 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 9674 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 9675 * 9676 * <p>A layer is associated with an optional {@link android.graphics.Paint} 9677 * instance that controls how the layer is composed on screen. The following 9678 * properties of the paint are taken into account when composing the layer:</p> 9679 * <ul> 9680 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 9681 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 9682 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 9683 * </ul> 9684 * 9685 * <p>If this view has an alpha value set to < 1.0 by calling 9686 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 9687 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 9688 * equivalent to setting a hardware layer on this view and providing a paint with 9689 * the desired alpha value.<p> 9690 * 9691 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 9692 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 9693 * for more information on when and how to use layers.</p> 9694 * 9695 * @param layerType The ype of layer to use with this view, must be one of 9696 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9697 * {@link #LAYER_TYPE_HARDWARE} 9698 * @param paint The paint used to compose the layer. This argument is optional 9699 * and can be null. It is ignored when the layer type is 9700 * {@link #LAYER_TYPE_NONE} 9701 * 9702 * @see #getLayerType() 9703 * @see #LAYER_TYPE_NONE 9704 * @see #LAYER_TYPE_SOFTWARE 9705 * @see #LAYER_TYPE_HARDWARE 9706 * @see #setAlpha(float) 9707 * 9708 * @attr ref android.R.styleable#View_layerType 9709 */ 9710 public void setLayerType(int layerType, Paint paint) { 9711 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 9712 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 9713 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 9714 } 9715 9716 if (layerType == mLayerType) { 9717 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 9718 mLayerPaint = paint == null ? new Paint() : paint; 9719 invalidateParentCaches(); 9720 invalidate(true); 9721 } 9722 return; 9723 } 9724 9725 // Destroy any previous software drawing cache if needed 9726 switch (mLayerType) { 9727 case LAYER_TYPE_HARDWARE: 9728 destroyLayer(); 9729 // fall through - unaccelerated views may use software layer mechanism instead 9730 case LAYER_TYPE_SOFTWARE: 9731 destroyDrawingCache(); 9732 break; 9733 default: 9734 break; 9735 } 9736 9737 mLayerType = layerType; 9738 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 9739 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 9740 mLocalDirtyRect = layerDisabled ? null : new Rect(); 9741 9742 invalidateParentCaches(); 9743 invalidate(true); 9744 } 9745 9746 /** 9747 * Indicates what type of layer is currently associated with this view. By default 9748 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 9749 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 9750 * for more information on the different types of layers. 9751 * 9752 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9753 * {@link #LAYER_TYPE_HARDWARE} 9754 * 9755 * @see #setLayerType(int, android.graphics.Paint) 9756 * @see #buildLayer() 9757 * @see #LAYER_TYPE_NONE 9758 * @see #LAYER_TYPE_SOFTWARE 9759 * @see #LAYER_TYPE_HARDWARE 9760 */ 9761 public int getLayerType() { 9762 return mLayerType; 9763 } 9764 9765 /** 9766 * Forces this view's layer to be created and this view to be rendered 9767 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 9768 * invoking this method will have no effect. 9769 * 9770 * This method can for instance be used to render a view into its layer before 9771 * starting an animation. If this view is complex, rendering into the layer 9772 * before starting the animation will avoid skipping frames. 9773 * 9774 * @throws IllegalStateException If this view is not attached to a window 9775 * 9776 * @see #setLayerType(int, android.graphics.Paint) 9777 */ 9778 public void buildLayer() { 9779 if (mLayerType == LAYER_TYPE_NONE) return; 9780 9781 if (mAttachInfo == null) { 9782 throw new IllegalStateException("This view must be attached to a window first"); 9783 } 9784 9785 switch (mLayerType) { 9786 case LAYER_TYPE_HARDWARE: 9787 getHardwareLayer(); 9788 break; 9789 case LAYER_TYPE_SOFTWARE: 9790 buildDrawingCache(true); 9791 break; 9792 } 9793 } 9794 9795 /** 9796 * <p>Returns a hardware layer that can be used to draw this view again 9797 * without executing its draw method.</p> 9798 * 9799 * @return A HardwareLayer ready to render, or null if an error occurred. 9800 */ 9801 HardwareLayer getHardwareLayer() { 9802 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 9803 !mAttachInfo.mHardwareRenderer.isEnabled()) { 9804 return null; 9805 } 9806 9807 final int width = mRight - mLeft; 9808 final int height = mBottom - mTop; 9809 9810 if (width == 0 || height == 0) { 9811 return null; 9812 } 9813 9814 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 9815 if (mHardwareLayer == null) { 9816 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 9817 width, height, isOpaque()); 9818 mLocalDirtyRect.setEmpty(); 9819 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 9820 mHardwareLayer.resize(width, height); 9821 mLocalDirtyRect.setEmpty(); 9822 } 9823 9824 HardwareCanvas currentCanvas = mAttachInfo.mHardwareCanvas; 9825 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 9826 mAttachInfo.mHardwareCanvas = canvas; 9827 try { 9828 canvas.setViewport(width, height); 9829 canvas.onPreDraw(mLocalDirtyRect); 9830 mLocalDirtyRect.setEmpty(); 9831 9832 final int restoreCount = canvas.save(); 9833 9834 computeScroll(); 9835 canvas.translate(-mScrollX, -mScrollY); 9836 9837 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9838 9839 // Fast path for layouts with no backgrounds 9840 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9841 mPrivateFlags &= ~DIRTY_MASK; 9842 dispatchDraw(canvas); 9843 } else { 9844 draw(canvas); 9845 } 9846 9847 canvas.restoreToCount(restoreCount); 9848 } finally { 9849 canvas.onPostDraw(); 9850 mHardwareLayer.end(currentCanvas); 9851 mAttachInfo.mHardwareCanvas = currentCanvas; 9852 } 9853 } 9854 9855 return mHardwareLayer; 9856 } 9857 9858 boolean destroyLayer() { 9859 if (mHardwareLayer != null) { 9860 mHardwareLayer.destroy(); 9861 mHardwareLayer = null; 9862 return true; 9863 } 9864 return false; 9865 } 9866 9867 /** 9868 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 9869 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 9870 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 9871 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 9872 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 9873 * null.</p> 9874 * 9875 * <p>Enabling the drawing cache is similar to 9876 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 9877 * acceleration is turned off. When hardware acceleration is turned on, enabling the 9878 * drawing cache has no effect on rendering because the system uses a different mechanism 9879 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 9880 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 9881 * for information on how to enable software and hardware layers.</p> 9882 * 9883 * <p>This API can be used to manually generate 9884 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 9885 * {@link #getDrawingCache()}.</p> 9886 * 9887 * @param enabled true to enable the drawing cache, false otherwise 9888 * 9889 * @see #isDrawingCacheEnabled() 9890 * @see #getDrawingCache() 9891 * @see #buildDrawingCache() 9892 * @see #setLayerType(int, android.graphics.Paint) 9893 */ 9894 public void setDrawingCacheEnabled(boolean enabled) { 9895 mCachingFailed = false; 9896 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 9897 } 9898 9899 /** 9900 * <p>Indicates whether the drawing cache is enabled for this view.</p> 9901 * 9902 * @return true if the drawing cache is enabled 9903 * 9904 * @see #setDrawingCacheEnabled(boolean) 9905 * @see #getDrawingCache() 9906 */ 9907 @ViewDebug.ExportedProperty(category = "drawing") 9908 public boolean isDrawingCacheEnabled() { 9909 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 9910 } 9911 9912 /** 9913 * Debugging utility which recursively outputs the dirty state of a view and its 9914 * descendants. 9915 * 9916 * @hide 9917 */ 9918 @SuppressWarnings({"UnusedDeclaration"}) 9919 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 9920 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 9921 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 9922 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 9923 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 9924 if (clear) { 9925 mPrivateFlags &= clearMask; 9926 } 9927 if (this instanceof ViewGroup) { 9928 ViewGroup parent = (ViewGroup) this; 9929 final int count = parent.getChildCount(); 9930 for (int i = 0; i < count; i++) { 9931 final View child = parent.getChildAt(i); 9932 child.outputDirtyFlags(indent + " ", clear, clearMask); 9933 } 9934 } 9935 } 9936 9937 /** 9938 * This method is used by ViewGroup to cause its children to restore or recreate their 9939 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 9940 * to recreate its own display list, which would happen if it went through the normal 9941 * draw/dispatchDraw mechanisms. 9942 * 9943 * @hide 9944 */ 9945 protected void dispatchGetDisplayList() {} 9946 9947 /** 9948 * A view that is not attached or hardware accelerated cannot create a display list. 9949 * This method checks these conditions and returns the appropriate result. 9950 * 9951 * @return true if view has the ability to create a display list, false otherwise. 9952 * 9953 * @hide 9954 */ 9955 public boolean canHaveDisplayList() { 9956 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 9957 } 9958 9959 /** 9960 * <p>Returns a display list that can be used to draw this view again 9961 * without executing its draw method.</p> 9962 * 9963 * @return A DisplayList ready to replay, or null if caching is not enabled. 9964 * 9965 * @hide 9966 */ 9967 public DisplayList getDisplayList() { 9968 if (!canHaveDisplayList()) { 9969 return null; 9970 } 9971 9972 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 9973 mDisplayList == null || !mDisplayList.isValid() || 9974 mRecreateDisplayList)) { 9975 // Don't need to recreate the display list, just need to tell our 9976 // children to restore/recreate theirs 9977 if (mDisplayList != null && mDisplayList.isValid() && 9978 !mRecreateDisplayList) { 9979 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9980 mPrivateFlags &= ~DIRTY_MASK; 9981 dispatchGetDisplayList(); 9982 9983 return mDisplayList; 9984 } 9985 9986 // If we got here, we're recreating it. Mark it as such to ensure that 9987 // we copy in child display lists into ours in drawChild() 9988 mRecreateDisplayList = true; 9989 if (mDisplayList == null) { 9990 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 9991 // If we're creating a new display list, make sure our parent gets invalidated 9992 // since they will need to recreate their display list to account for this 9993 // new child display list. 9994 invalidateParentCaches(); 9995 } 9996 9997 final HardwareCanvas canvas = mDisplayList.start(); 9998 int restoreCount = 0; 9999 try { 10000 int width = mRight - mLeft; 10001 int height = mBottom - mTop; 10002 10003 canvas.setViewport(width, height); 10004 // The dirty rect should always be null for a display list 10005 canvas.onPreDraw(null); 10006 10007 computeScroll(); 10008 10009 restoreCount = canvas.save(); 10010 canvas.translate(-mScrollX, -mScrollY); 10011 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10012 mPrivateFlags &= ~DIRTY_MASK; 10013 10014 // Fast path for layouts with no backgrounds 10015 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10016 dispatchDraw(canvas); 10017 } else { 10018 draw(canvas); 10019 } 10020 } finally { 10021 canvas.restoreToCount(restoreCount); 10022 canvas.onPostDraw(); 10023 10024 mDisplayList.end(); 10025 } 10026 } else { 10027 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10028 mPrivateFlags &= ~DIRTY_MASK; 10029 } 10030 10031 return mDisplayList; 10032 } 10033 10034 /** 10035 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 10036 * 10037 * @return A non-scaled bitmap representing this view or null if cache is disabled. 10038 * 10039 * @see #getDrawingCache(boolean) 10040 */ 10041 public Bitmap getDrawingCache() { 10042 return getDrawingCache(false); 10043 } 10044 10045 /** 10046 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 10047 * is null when caching is disabled. If caching is enabled and the cache is not ready, 10048 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 10049 * draw from the cache when the cache is enabled. To benefit from the cache, you must 10050 * request the drawing cache by calling this method and draw it on screen if the 10051 * returned bitmap is not null.</p> 10052 * 10053 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10054 * this method will create a bitmap of the same size as this view. Because this bitmap 10055 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10056 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10057 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10058 * size than the view. This implies that your application must be able to handle this 10059 * size.</p> 10060 * 10061 * @param autoScale Indicates whether the generated bitmap should be scaled based on 10062 * the current density of the screen when the application is in compatibility 10063 * mode. 10064 * 10065 * @return A bitmap representing this view or null if cache is disabled. 10066 * 10067 * @see #setDrawingCacheEnabled(boolean) 10068 * @see #isDrawingCacheEnabled() 10069 * @see #buildDrawingCache(boolean) 10070 * @see #destroyDrawingCache() 10071 */ 10072 public Bitmap getDrawingCache(boolean autoScale) { 10073 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 10074 return null; 10075 } 10076 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 10077 buildDrawingCache(autoScale); 10078 } 10079 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 10080 } 10081 10082 /** 10083 * <p>Frees the resources used by the drawing cache. If you call 10084 * {@link #buildDrawingCache()} manually without calling 10085 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10086 * should cleanup the cache with this method afterwards.</p> 10087 * 10088 * @see #setDrawingCacheEnabled(boolean) 10089 * @see #buildDrawingCache() 10090 * @see #getDrawingCache() 10091 */ 10092 public void destroyDrawingCache() { 10093 if (mDrawingCache != null) { 10094 mDrawingCache.recycle(); 10095 mDrawingCache = null; 10096 } 10097 if (mUnscaledDrawingCache != null) { 10098 mUnscaledDrawingCache.recycle(); 10099 mUnscaledDrawingCache = null; 10100 } 10101 } 10102 10103 /** 10104 * Setting a solid background color for the drawing cache's bitmaps will improve 10105 * perfromance and memory usage. Note, though that this should only be used if this 10106 * view will always be drawn on top of a solid color. 10107 * 10108 * @param color The background color to use for the drawing cache's bitmap 10109 * 10110 * @see #setDrawingCacheEnabled(boolean) 10111 * @see #buildDrawingCache() 10112 * @see #getDrawingCache() 10113 */ 10114 public void setDrawingCacheBackgroundColor(int color) { 10115 if (color != mDrawingCacheBackgroundColor) { 10116 mDrawingCacheBackgroundColor = color; 10117 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10118 } 10119 } 10120 10121 /** 10122 * @see #setDrawingCacheBackgroundColor(int) 10123 * 10124 * @return The background color to used for the drawing cache's bitmap 10125 */ 10126 public int getDrawingCacheBackgroundColor() { 10127 return mDrawingCacheBackgroundColor; 10128 } 10129 10130 /** 10131 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 10132 * 10133 * @see #buildDrawingCache(boolean) 10134 */ 10135 public void buildDrawingCache() { 10136 buildDrawingCache(false); 10137 } 10138 10139 /** 10140 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 10141 * 10142 * <p>If you call {@link #buildDrawingCache()} manually without calling 10143 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10144 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 10145 * 10146 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10147 * this method will create a bitmap of the same size as this view. Because this bitmap 10148 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10149 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10150 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10151 * size than the view. This implies that your application must be able to handle this 10152 * size.</p> 10153 * 10154 * <p>You should avoid calling this method when hardware acceleration is enabled. If 10155 * you do not need the drawing cache bitmap, calling this method will increase memory 10156 * usage and cause the view to be rendered in software once, thus negatively impacting 10157 * performance.</p> 10158 * 10159 * @see #getDrawingCache() 10160 * @see #destroyDrawingCache() 10161 */ 10162 public void buildDrawingCache(boolean autoScale) { 10163 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 10164 mDrawingCache == null : mUnscaledDrawingCache == null)) { 10165 mCachingFailed = false; 10166 10167 if (ViewDebug.TRACE_HIERARCHY) { 10168 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 10169 } 10170 10171 int width = mRight - mLeft; 10172 int height = mBottom - mTop; 10173 10174 final AttachInfo attachInfo = mAttachInfo; 10175 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 10176 10177 if (autoScale && scalingRequired) { 10178 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 10179 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 10180 } 10181 10182 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 10183 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 10184 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 10185 10186 if (width <= 0 || height <= 0 || 10187 // Projected bitmap size in bytes 10188 (width * height * (opaque && !use32BitCache ? 2 : 4) > 10189 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 10190 destroyDrawingCache(); 10191 mCachingFailed = true; 10192 return; 10193 } 10194 10195 boolean clear = true; 10196 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 10197 10198 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 10199 Bitmap.Config quality; 10200 if (!opaque) { 10201 // Never pick ARGB_4444 because it looks awful 10202 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 10203 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 10204 case DRAWING_CACHE_QUALITY_AUTO: 10205 quality = Bitmap.Config.ARGB_8888; 10206 break; 10207 case DRAWING_CACHE_QUALITY_LOW: 10208 quality = Bitmap.Config.ARGB_8888; 10209 break; 10210 case DRAWING_CACHE_QUALITY_HIGH: 10211 quality = Bitmap.Config.ARGB_8888; 10212 break; 10213 default: 10214 quality = Bitmap.Config.ARGB_8888; 10215 break; 10216 } 10217 } else { 10218 // Optimization for translucent windows 10219 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 10220 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 10221 } 10222 10223 // Try to cleanup memory 10224 if (bitmap != null) bitmap.recycle(); 10225 10226 try { 10227 bitmap = Bitmap.createBitmap(width, height, quality); 10228 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10229 if (autoScale) { 10230 mDrawingCache = bitmap; 10231 } else { 10232 mUnscaledDrawingCache = bitmap; 10233 } 10234 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 10235 } catch (OutOfMemoryError e) { 10236 // If there is not enough memory to create the bitmap cache, just 10237 // ignore the issue as bitmap caches are not required to draw the 10238 // view hierarchy 10239 if (autoScale) { 10240 mDrawingCache = null; 10241 } else { 10242 mUnscaledDrawingCache = null; 10243 } 10244 mCachingFailed = true; 10245 return; 10246 } 10247 10248 clear = drawingCacheBackgroundColor != 0; 10249 } 10250 10251 Canvas canvas; 10252 if (attachInfo != null) { 10253 canvas = attachInfo.mCanvas; 10254 if (canvas == null) { 10255 canvas = new Canvas(); 10256 } 10257 canvas.setBitmap(bitmap); 10258 // Temporarily clobber the cached Canvas in case one of our children 10259 // is also using a drawing cache. Without this, the children would 10260 // steal the canvas by attaching their own bitmap to it and bad, bad 10261 // thing would happen (invisible views, corrupted drawings, etc.) 10262 attachInfo.mCanvas = null; 10263 } else { 10264 // This case should hopefully never or seldom happen 10265 canvas = new Canvas(bitmap); 10266 } 10267 10268 if (clear) { 10269 bitmap.eraseColor(drawingCacheBackgroundColor); 10270 } 10271 10272 computeScroll(); 10273 final int restoreCount = canvas.save(); 10274 10275 if (autoScale && scalingRequired) { 10276 final float scale = attachInfo.mApplicationScale; 10277 canvas.scale(scale, scale); 10278 } 10279 10280 canvas.translate(-mScrollX, -mScrollY); 10281 10282 mPrivateFlags |= DRAWN; 10283 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 10284 mLayerType != LAYER_TYPE_NONE) { 10285 mPrivateFlags |= DRAWING_CACHE_VALID; 10286 } 10287 10288 // Fast path for layouts with no backgrounds 10289 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10290 if (ViewDebug.TRACE_HIERARCHY) { 10291 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10292 } 10293 mPrivateFlags &= ~DIRTY_MASK; 10294 dispatchDraw(canvas); 10295 } else { 10296 draw(canvas); 10297 } 10298 10299 canvas.restoreToCount(restoreCount); 10300 canvas.setBitmap(null); 10301 10302 if (attachInfo != null) { 10303 // Restore the cached Canvas for our siblings 10304 attachInfo.mCanvas = canvas; 10305 } 10306 } 10307 } 10308 10309 /** 10310 * Create a snapshot of the view into a bitmap. We should probably make 10311 * some form of this public, but should think about the API. 10312 */ 10313 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 10314 int width = mRight - mLeft; 10315 int height = mBottom - mTop; 10316 10317 final AttachInfo attachInfo = mAttachInfo; 10318 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 10319 width = (int) ((width * scale) + 0.5f); 10320 height = (int) ((height * scale) + 0.5f); 10321 10322 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 10323 if (bitmap == null) { 10324 throw new OutOfMemoryError(); 10325 } 10326 10327 Resources resources = getResources(); 10328 if (resources != null) { 10329 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 10330 } 10331 10332 Canvas canvas; 10333 if (attachInfo != null) { 10334 canvas = attachInfo.mCanvas; 10335 if (canvas == null) { 10336 canvas = new Canvas(); 10337 } 10338 canvas.setBitmap(bitmap); 10339 // Temporarily clobber the cached Canvas in case one of our children 10340 // is also using a drawing cache. Without this, the children would 10341 // steal the canvas by attaching their own bitmap to it and bad, bad 10342 // things would happen (invisible views, corrupted drawings, etc.) 10343 attachInfo.mCanvas = null; 10344 } else { 10345 // This case should hopefully never or seldom happen 10346 canvas = new Canvas(bitmap); 10347 } 10348 10349 if ((backgroundColor & 0xff000000) != 0) { 10350 bitmap.eraseColor(backgroundColor); 10351 } 10352 10353 computeScroll(); 10354 final int restoreCount = canvas.save(); 10355 canvas.scale(scale, scale); 10356 canvas.translate(-mScrollX, -mScrollY); 10357 10358 // Temporarily remove the dirty mask 10359 int flags = mPrivateFlags; 10360 mPrivateFlags &= ~DIRTY_MASK; 10361 10362 // Fast path for layouts with no backgrounds 10363 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10364 dispatchDraw(canvas); 10365 } else { 10366 draw(canvas); 10367 } 10368 10369 mPrivateFlags = flags; 10370 10371 canvas.restoreToCount(restoreCount); 10372 canvas.setBitmap(null); 10373 10374 if (attachInfo != null) { 10375 // Restore the cached Canvas for our siblings 10376 attachInfo.mCanvas = canvas; 10377 } 10378 10379 return bitmap; 10380 } 10381 10382 /** 10383 * Indicates whether this View is currently in edit mode. A View is usually 10384 * in edit mode when displayed within a developer tool. For instance, if 10385 * this View is being drawn by a visual user interface builder, this method 10386 * should return true. 10387 * 10388 * Subclasses should check the return value of this method to provide 10389 * different behaviors if their normal behavior might interfere with the 10390 * host environment. For instance: the class spawns a thread in its 10391 * constructor, the drawing code relies on device-specific features, etc. 10392 * 10393 * This method is usually checked in the drawing code of custom widgets. 10394 * 10395 * @return True if this View is in edit mode, false otherwise. 10396 */ 10397 public boolean isInEditMode() { 10398 return false; 10399 } 10400 10401 /** 10402 * If the View draws content inside its padding and enables fading edges, 10403 * it needs to support padding offsets. Padding offsets are added to the 10404 * fading edges to extend the length of the fade so that it covers pixels 10405 * drawn inside the padding. 10406 * 10407 * Subclasses of this class should override this method if they need 10408 * to draw content inside the padding. 10409 * 10410 * @return True if padding offset must be applied, false otherwise. 10411 * 10412 * @see #getLeftPaddingOffset() 10413 * @see #getRightPaddingOffset() 10414 * @see #getTopPaddingOffset() 10415 * @see #getBottomPaddingOffset() 10416 * 10417 * @since CURRENT 10418 */ 10419 protected boolean isPaddingOffsetRequired() { 10420 return false; 10421 } 10422 10423 /** 10424 * Amount by which to extend the left fading region. Called only when 10425 * {@link #isPaddingOffsetRequired()} returns true. 10426 * 10427 * @return The left padding offset in pixels. 10428 * 10429 * @see #isPaddingOffsetRequired() 10430 * 10431 * @since CURRENT 10432 */ 10433 protected int getLeftPaddingOffset() { 10434 return 0; 10435 } 10436 10437 /** 10438 * Amount by which to extend the right fading region. Called only when 10439 * {@link #isPaddingOffsetRequired()} returns true. 10440 * 10441 * @return The right padding offset in pixels. 10442 * 10443 * @see #isPaddingOffsetRequired() 10444 * 10445 * @since CURRENT 10446 */ 10447 protected int getRightPaddingOffset() { 10448 return 0; 10449 } 10450 10451 /** 10452 * Amount by which to extend the top fading region. Called only when 10453 * {@link #isPaddingOffsetRequired()} returns true. 10454 * 10455 * @return The top padding offset in pixels. 10456 * 10457 * @see #isPaddingOffsetRequired() 10458 * 10459 * @since CURRENT 10460 */ 10461 protected int getTopPaddingOffset() { 10462 return 0; 10463 } 10464 10465 /** 10466 * Amount by which to extend the bottom fading region. Called only when 10467 * {@link #isPaddingOffsetRequired()} returns true. 10468 * 10469 * @return The bottom padding offset in pixels. 10470 * 10471 * @see #isPaddingOffsetRequired() 10472 * 10473 * @since CURRENT 10474 */ 10475 protected int getBottomPaddingOffset() { 10476 return 0; 10477 } 10478 10479 /** 10480 * @hide 10481 * @param offsetRequired 10482 */ 10483 protected int getFadeTop(boolean offsetRequired) { 10484 int top = mPaddingTop; 10485 if (offsetRequired) top += getTopPaddingOffset(); 10486 return top; 10487 } 10488 10489 /** 10490 * @hide 10491 * @param offsetRequired 10492 */ 10493 protected int getFadeHeight(boolean offsetRequired) { 10494 int padding = mPaddingTop; 10495 if (offsetRequired) padding += getTopPaddingOffset(); 10496 return mBottom - mTop - mPaddingBottom - padding; 10497 } 10498 10499 /** 10500 * <p>Indicates whether this view is attached to an hardware accelerated 10501 * window or not.</p> 10502 * 10503 * <p>Even if this method returns true, it does not mean that every call 10504 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 10505 * accelerated {@link android.graphics.Canvas}. For instance, if this view 10506 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 10507 * window is hardware accelerated, 10508 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 10509 * return false, and this method will return true.</p> 10510 * 10511 * @return True if the view is attached to a window and the window is 10512 * hardware accelerated; false in any other case. 10513 */ 10514 public boolean isHardwareAccelerated() { 10515 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 10516 } 10517 10518 /** 10519 * Manually render this view (and all of its children) to the given Canvas. 10520 * The view must have already done a full layout before this function is 10521 * called. When implementing a view, implement 10522 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 10523 * If you do need to override this method, call the superclass version. 10524 * 10525 * @param canvas The Canvas to which the View is rendered. 10526 */ 10527 public void draw(Canvas canvas) { 10528 if (ViewDebug.TRACE_HIERARCHY) { 10529 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10530 } 10531 10532 final int privateFlags = mPrivateFlags; 10533 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 10534 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 10535 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 10536 10537 /* 10538 * Draw traversal performs several drawing steps which must be executed 10539 * in the appropriate order: 10540 * 10541 * 1. Draw the background 10542 * 2. If necessary, save the canvas' layers to prepare for fading 10543 * 3. Draw view's content 10544 * 4. Draw children 10545 * 5. If necessary, draw the fading edges and restore layers 10546 * 6. Draw decorations (scrollbars for instance) 10547 */ 10548 10549 // Step 1, draw the background, if needed 10550 int saveCount; 10551 10552 if (!dirtyOpaque) { 10553 final Drawable background = mBGDrawable; 10554 if (background != null) { 10555 final int scrollX = mScrollX; 10556 final int scrollY = mScrollY; 10557 10558 if (mBackgroundSizeChanged) { 10559 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 10560 mBackgroundSizeChanged = false; 10561 } 10562 10563 if ((scrollX | scrollY) == 0) { 10564 background.draw(canvas); 10565 } else { 10566 canvas.translate(scrollX, scrollY); 10567 background.draw(canvas); 10568 canvas.translate(-scrollX, -scrollY); 10569 } 10570 } 10571 } 10572 10573 // skip step 2 & 5 if possible (common case) 10574 final int viewFlags = mViewFlags; 10575 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 10576 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 10577 if (!verticalEdges && !horizontalEdges) { 10578 // Step 3, draw the content 10579 if (!dirtyOpaque) onDraw(canvas); 10580 10581 // Step 4, draw the children 10582 dispatchDraw(canvas); 10583 10584 // Step 6, draw decorations (scrollbars) 10585 onDrawScrollBars(canvas); 10586 10587 // we're done... 10588 return; 10589 } 10590 10591 /* 10592 * Here we do the full fledged routine... 10593 * (this is an uncommon case where speed matters less, 10594 * this is why we repeat some of the tests that have been 10595 * done above) 10596 */ 10597 10598 boolean drawTop = false; 10599 boolean drawBottom = false; 10600 boolean drawLeft = false; 10601 boolean drawRight = false; 10602 10603 float topFadeStrength = 0.0f; 10604 float bottomFadeStrength = 0.0f; 10605 float leftFadeStrength = 0.0f; 10606 float rightFadeStrength = 0.0f; 10607 10608 // Step 2, save the canvas' layers 10609 int paddingLeft = mPaddingLeft; 10610 10611 final boolean offsetRequired = isPaddingOffsetRequired(); 10612 if (offsetRequired) { 10613 paddingLeft += getLeftPaddingOffset(); 10614 } 10615 10616 int left = mScrollX + paddingLeft; 10617 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 10618 int top = mScrollY + getFadeTop(offsetRequired); 10619 int bottom = top + getFadeHeight(offsetRequired); 10620 10621 if (offsetRequired) { 10622 right += getRightPaddingOffset(); 10623 bottom += getBottomPaddingOffset(); 10624 } 10625 10626 final ScrollabilityCache scrollabilityCache = mScrollCache; 10627 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 10628 int length = (int) fadeHeight; 10629 10630 // clip the fade length if top and bottom fades overlap 10631 // overlapping fades produce odd-looking artifacts 10632 if (verticalEdges && (top + length > bottom - length)) { 10633 length = (bottom - top) / 2; 10634 } 10635 10636 // also clip horizontal fades if necessary 10637 if (horizontalEdges && (left + length > right - length)) { 10638 length = (right - left) / 2; 10639 } 10640 10641 if (verticalEdges) { 10642 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 10643 drawTop = topFadeStrength * fadeHeight > 1.0f; 10644 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 10645 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 10646 } 10647 10648 if (horizontalEdges) { 10649 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 10650 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 10651 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 10652 drawRight = rightFadeStrength * fadeHeight > 1.0f; 10653 } 10654 10655 saveCount = canvas.getSaveCount(); 10656 10657 int solidColor = getSolidColor(); 10658 if (solidColor == 0) { 10659 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 10660 10661 if (drawTop) { 10662 canvas.saveLayer(left, top, right, top + length, null, flags); 10663 } 10664 10665 if (drawBottom) { 10666 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 10667 } 10668 10669 if (drawLeft) { 10670 canvas.saveLayer(left, top, left + length, bottom, null, flags); 10671 } 10672 10673 if (drawRight) { 10674 canvas.saveLayer(right - length, top, right, bottom, null, flags); 10675 } 10676 } else { 10677 scrollabilityCache.setFadeColor(solidColor); 10678 } 10679 10680 // Step 3, draw the content 10681 if (!dirtyOpaque) onDraw(canvas); 10682 10683 // Step 4, draw the children 10684 dispatchDraw(canvas); 10685 10686 // Step 5, draw the fade effect and restore layers 10687 final Paint p = scrollabilityCache.paint; 10688 final Matrix matrix = scrollabilityCache.matrix; 10689 final Shader fade = scrollabilityCache.shader; 10690 10691 if (drawTop) { 10692 matrix.setScale(1, fadeHeight * topFadeStrength); 10693 matrix.postTranslate(left, top); 10694 fade.setLocalMatrix(matrix); 10695 canvas.drawRect(left, top, right, top + length, p); 10696 } 10697 10698 if (drawBottom) { 10699 matrix.setScale(1, fadeHeight * bottomFadeStrength); 10700 matrix.postRotate(180); 10701 matrix.postTranslate(left, bottom); 10702 fade.setLocalMatrix(matrix); 10703 canvas.drawRect(left, bottom - length, right, bottom, p); 10704 } 10705 10706 if (drawLeft) { 10707 matrix.setScale(1, fadeHeight * leftFadeStrength); 10708 matrix.postRotate(-90); 10709 matrix.postTranslate(left, top); 10710 fade.setLocalMatrix(matrix); 10711 canvas.drawRect(left, top, left + length, bottom, p); 10712 } 10713 10714 if (drawRight) { 10715 matrix.setScale(1, fadeHeight * rightFadeStrength); 10716 matrix.postRotate(90); 10717 matrix.postTranslate(right, top); 10718 fade.setLocalMatrix(matrix); 10719 canvas.drawRect(right - length, top, right, bottom, p); 10720 } 10721 10722 canvas.restoreToCount(saveCount); 10723 10724 // Step 6, draw decorations (scrollbars) 10725 onDrawScrollBars(canvas); 10726 } 10727 10728 /** 10729 * Override this if your view is known to always be drawn on top of a solid color background, 10730 * and needs to draw fading edges. Returning a non-zero color enables the view system to 10731 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 10732 * should be set to 0xFF. 10733 * 10734 * @see #setVerticalFadingEdgeEnabled(boolean) 10735 * @see #setHorizontalFadingEdgeEnabled(boolean) 10736 * 10737 * @return The known solid color background for this view, or 0 if the color may vary 10738 */ 10739 @ViewDebug.ExportedProperty(category = "drawing") 10740 public int getSolidColor() { 10741 return 0; 10742 } 10743 10744 /** 10745 * Build a human readable string representation of the specified view flags. 10746 * 10747 * @param flags the view flags to convert to a string 10748 * @return a String representing the supplied flags 10749 */ 10750 private static String printFlags(int flags) { 10751 String output = ""; 10752 int numFlags = 0; 10753 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 10754 output += "TAKES_FOCUS"; 10755 numFlags++; 10756 } 10757 10758 switch (flags & VISIBILITY_MASK) { 10759 case INVISIBLE: 10760 if (numFlags > 0) { 10761 output += " "; 10762 } 10763 output += "INVISIBLE"; 10764 // USELESS HERE numFlags++; 10765 break; 10766 case GONE: 10767 if (numFlags > 0) { 10768 output += " "; 10769 } 10770 output += "GONE"; 10771 // USELESS HERE numFlags++; 10772 break; 10773 default: 10774 break; 10775 } 10776 return output; 10777 } 10778 10779 /** 10780 * Build a human readable string representation of the specified private 10781 * view flags. 10782 * 10783 * @param privateFlags the private view flags to convert to a string 10784 * @return a String representing the supplied flags 10785 */ 10786 private static String printPrivateFlags(int privateFlags) { 10787 String output = ""; 10788 int numFlags = 0; 10789 10790 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 10791 output += "WANTS_FOCUS"; 10792 numFlags++; 10793 } 10794 10795 if ((privateFlags & FOCUSED) == FOCUSED) { 10796 if (numFlags > 0) { 10797 output += " "; 10798 } 10799 output += "FOCUSED"; 10800 numFlags++; 10801 } 10802 10803 if ((privateFlags & SELECTED) == SELECTED) { 10804 if (numFlags > 0) { 10805 output += " "; 10806 } 10807 output += "SELECTED"; 10808 numFlags++; 10809 } 10810 10811 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 10812 if (numFlags > 0) { 10813 output += " "; 10814 } 10815 output += "IS_ROOT_NAMESPACE"; 10816 numFlags++; 10817 } 10818 10819 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 10820 if (numFlags > 0) { 10821 output += " "; 10822 } 10823 output += "HAS_BOUNDS"; 10824 numFlags++; 10825 } 10826 10827 if ((privateFlags & DRAWN) == DRAWN) { 10828 if (numFlags > 0) { 10829 output += " "; 10830 } 10831 output += "DRAWN"; 10832 // USELESS HERE numFlags++; 10833 } 10834 return output; 10835 } 10836 10837 /** 10838 * <p>Indicates whether or not this view's layout will be requested during 10839 * the next hierarchy layout pass.</p> 10840 * 10841 * @return true if the layout will be forced during next layout pass 10842 */ 10843 public boolean isLayoutRequested() { 10844 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 10845 } 10846 10847 /** 10848 * Assign a size and position to a view and all of its 10849 * descendants 10850 * 10851 * <p>This is the second phase of the layout mechanism. 10852 * (The first is measuring). In this phase, each parent calls 10853 * layout on all of its children to position them. 10854 * This is typically done using the child measurements 10855 * that were stored in the measure pass().</p> 10856 * 10857 * <p>Derived classes should not override this method. 10858 * Derived classes with children should override 10859 * onLayout. In that method, they should 10860 * call layout on each of their children.</p> 10861 * 10862 * @param l Left position, relative to parent 10863 * @param t Top position, relative to parent 10864 * @param r Right position, relative to parent 10865 * @param b Bottom position, relative to parent 10866 */ 10867 @SuppressWarnings({"unchecked"}) 10868 public void layout(int l, int t, int r, int b) { 10869 int oldL = mLeft; 10870 int oldT = mTop; 10871 int oldB = mBottom; 10872 int oldR = mRight; 10873 boolean changed = setFrame(l, t, r, b); 10874 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 10875 if (ViewDebug.TRACE_HIERARCHY) { 10876 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 10877 } 10878 10879 onLayout(changed, l, t, r, b); 10880 mPrivateFlags &= ~LAYOUT_REQUIRED; 10881 10882 if (mOnLayoutChangeListeners != null) { 10883 ArrayList<OnLayoutChangeListener> listenersCopy = 10884 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 10885 int numListeners = listenersCopy.size(); 10886 for (int i = 0; i < numListeners; ++i) { 10887 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 10888 } 10889 } 10890 } 10891 mPrivateFlags &= ~FORCE_LAYOUT; 10892 } 10893 10894 /** 10895 * Called from layout when this view should 10896 * assign a size and position to each of its children. 10897 * 10898 * Derived classes with children should override 10899 * this method and call layout on each of 10900 * their children. 10901 * @param changed This is a new size or position for this view 10902 * @param left Left position, relative to parent 10903 * @param top Top position, relative to parent 10904 * @param right Right position, relative to parent 10905 * @param bottom Bottom position, relative to parent 10906 */ 10907 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 10908 } 10909 10910 /** 10911 * Assign a size and position to this view. 10912 * 10913 * This is called from layout. 10914 * 10915 * @param left Left position, relative to parent 10916 * @param top Top position, relative to parent 10917 * @param right Right position, relative to parent 10918 * @param bottom Bottom position, relative to parent 10919 * @return true if the new size and position are different than the 10920 * previous ones 10921 * {@hide} 10922 */ 10923 protected boolean setFrame(int left, int top, int right, int bottom) { 10924 boolean changed = false; 10925 10926 if (DBG) { 10927 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 10928 + right + "," + bottom + ")"); 10929 } 10930 10931 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 10932 changed = true; 10933 10934 // Remember our drawn bit 10935 int drawn = mPrivateFlags & DRAWN; 10936 10937 int oldWidth = mRight - mLeft; 10938 int oldHeight = mBottom - mTop; 10939 int newWidth = right - left; 10940 int newHeight = bottom - top; 10941 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 10942 10943 // Invalidate our old position 10944 invalidate(sizeChanged); 10945 10946 mLeft = left; 10947 mTop = top; 10948 mRight = right; 10949 mBottom = bottom; 10950 10951 mPrivateFlags |= HAS_BOUNDS; 10952 10953 10954 if (sizeChanged) { 10955 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 10956 // A change in dimension means an auto-centered pivot point changes, too 10957 mMatrixDirty = true; 10958 } 10959 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 10960 } 10961 10962 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 10963 // If we are visible, force the DRAWN bit to on so that 10964 // this invalidate will go through (at least to our parent). 10965 // This is because someone may have invalidated this view 10966 // before this call to setFrame came in, thereby clearing 10967 // the DRAWN bit. 10968 mPrivateFlags |= DRAWN; 10969 invalidate(sizeChanged); 10970 // parent display list may need to be recreated based on a change in the bounds 10971 // of any child 10972 invalidateParentCaches(); 10973 } 10974 10975 // Reset drawn bit to original value (invalidate turns it off) 10976 mPrivateFlags |= drawn; 10977 10978 mBackgroundSizeChanged = true; 10979 } 10980 return changed; 10981 } 10982 10983 /** 10984 * Finalize inflating a view from XML. This is called as the last phase 10985 * of inflation, after all child views have been added. 10986 * 10987 * <p>Even if the subclass overrides onFinishInflate, they should always be 10988 * sure to call the super method, so that we get called. 10989 */ 10990 protected void onFinishInflate() { 10991 } 10992 10993 /** 10994 * Returns the resources associated with this view. 10995 * 10996 * @return Resources object. 10997 */ 10998 public Resources getResources() { 10999 return mResources; 11000 } 11001 11002 /** 11003 * Invalidates the specified Drawable. 11004 * 11005 * @param drawable the drawable to invalidate 11006 */ 11007 public void invalidateDrawable(Drawable drawable) { 11008 if (verifyDrawable(drawable)) { 11009 final Rect dirty = drawable.getBounds(); 11010 final int scrollX = mScrollX; 11011 final int scrollY = mScrollY; 11012 11013 invalidate(dirty.left + scrollX, dirty.top + scrollY, 11014 dirty.right + scrollX, dirty.bottom + scrollY); 11015 } 11016 } 11017 11018 /** 11019 * Schedules an action on a drawable to occur at a specified time. 11020 * 11021 * @param who the recipient of the action 11022 * @param what the action to run on the drawable 11023 * @param when the time at which the action must occur. Uses the 11024 * {@link SystemClock#uptimeMillis} timebase. 11025 */ 11026 public void scheduleDrawable(Drawable who, Runnable what, long when) { 11027 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 11028 mAttachInfo.mHandler.postAtTime(what, who, when); 11029 } 11030 } 11031 11032 /** 11033 * Cancels a scheduled action on a drawable. 11034 * 11035 * @param who the recipient of the action 11036 * @param what the action to cancel 11037 */ 11038 public void unscheduleDrawable(Drawable who, Runnable what) { 11039 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 11040 mAttachInfo.mHandler.removeCallbacks(what, who); 11041 } 11042 } 11043 11044 /** 11045 * Unschedule any events associated with the given Drawable. This can be 11046 * used when selecting a new Drawable into a view, so that the previous 11047 * one is completely unscheduled. 11048 * 11049 * @param who The Drawable to unschedule. 11050 * 11051 * @see #drawableStateChanged 11052 */ 11053 public void unscheduleDrawable(Drawable who) { 11054 if (mAttachInfo != null) { 11055 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 11056 } 11057 } 11058 11059 /** 11060 * Return the layout direction of a given Drawable. 11061 * 11062 * @param who the Drawable to query 11063 * 11064 * @hide 11065 */ 11066 public int getResolvedLayoutDirection(Drawable who) { 11067 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 11068 } 11069 11070 /** 11071 * If your view subclass is displaying its own Drawable objects, it should 11072 * override this function and return true for any Drawable it is 11073 * displaying. This allows animations for those drawables to be 11074 * scheduled. 11075 * 11076 * <p>Be sure to call through to the super class when overriding this 11077 * function. 11078 * 11079 * @param who The Drawable to verify. Return true if it is one you are 11080 * displaying, else return the result of calling through to the 11081 * super class. 11082 * 11083 * @return boolean If true than the Drawable is being displayed in the 11084 * view; else false and it is not allowed to animate. 11085 * 11086 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 11087 * @see #drawableStateChanged() 11088 */ 11089 protected boolean verifyDrawable(Drawable who) { 11090 return who == mBGDrawable; 11091 } 11092 11093 /** 11094 * This function is called whenever the state of the view changes in such 11095 * a way that it impacts the state of drawables being shown. 11096 * 11097 * <p>Be sure to call through to the superclass when overriding this 11098 * function. 11099 * 11100 * @see Drawable#setState(int[]) 11101 */ 11102 protected void drawableStateChanged() { 11103 Drawable d = mBGDrawable; 11104 if (d != null && d.isStateful()) { 11105 d.setState(getDrawableState()); 11106 } 11107 } 11108 11109 /** 11110 * Call this to force a view to update its drawable state. This will cause 11111 * drawableStateChanged to be called on this view. Views that are interested 11112 * in the new state should call getDrawableState. 11113 * 11114 * @see #drawableStateChanged 11115 * @see #getDrawableState 11116 */ 11117 public void refreshDrawableState() { 11118 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11119 drawableStateChanged(); 11120 11121 ViewParent parent = mParent; 11122 if (parent != null) { 11123 parent.childDrawableStateChanged(this); 11124 } 11125 } 11126 11127 /** 11128 * Return an array of resource IDs of the drawable states representing the 11129 * current state of the view. 11130 * 11131 * @return The current drawable state 11132 * 11133 * @see Drawable#setState(int[]) 11134 * @see #drawableStateChanged() 11135 * @see #onCreateDrawableState(int) 11136 */ 11137 public final int[] getDrawableState() { 11138 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 11139 return mDrawableState; 11140 } else { 11141 mDrawableState = onCreateDrawableState(0); 11142 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 11143 return mDrawableState; 11144 } 11145 } 11146 11147 /** 11148 * Generate the new {@link android.graphics.drawable.Drawable} state for 11149 * this view. This is called by the view 11150 * system when the cached Drawable state is determined to be invalid. To 11151 * retrieve the current state, you should use {@link #getDrawableState}. 11152 * 11153 * @param extraSpace if non-zero, this is the number of extra entries you 11154 * would like in the returned array in which you can place your own 11155 * states. 11156 * 11157 * @return Returns an array holding the current {@link Drawable} state of 11158 * the view. 11159 * 11160 * @see #mergeDrawableStates(int[], int[]) 11161 */ 11162 protected int[] onCreateDrawableState(int extraSpace) { 11163 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 11164 mParent instanceof View) { 11165 return ((View) mParent).onCreateDrawableState(extraSpace); 11166 } 11167 11168 int[] drawableState; 11169 11170 int privateFlags = mPrivateFlags; 11171 11172 int viewStateIndex = 0; 11173 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 11174 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 11175 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 11176 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 11177 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 11178 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 11179 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 11180 HardwareRenderer.isAvailable()) { 11181 // This is set if HW acceleration is requested, even if the current 11182 // process doesn't allow it. This is just to allow app preview 11183 // windows to better match their app. 11184 viewStateIndex |= VIEW_STATE_ACCELERATED; 11185 } 11186 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 11187 11188 final int privateFlags2 = mPrivateFlags2; 11189 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 11190 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 11191 11192 drawableState = VIEW_STATE_SETS[viewStateIndex]; 11193 11194 //noinspection ConstantIfStatement 11195 if (false) { 11196 Log.i("View", "drawableStateIndex=" + viewStateIndex); 11197 Log.i("View", toString() 11198 + " pressed=" + ((privateFlags & PRESSED) != 0) 11199 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 11200 + " fo=" + hasFocus() 11201 + " sl=" + ((privateFlags & SELECTED) != 0) 11202 + " wf=" + hasWindowFocus() 11203 + ": " + Arrays.toString(drawableState)); 11204 } 11205 11206 if (extraSpace == 0) { 11207 return drawableState; 11208 } 11209 11210 final int[] fullState; 11211 if (drawableState != null) { 11212 fullState = new int[drawableState.length + extraSpace]; 11213 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 11214 } else { 11215 fullState = new int[extraSpace]; 11216 } 11217 11218 return fullState; 11219 } 11220 11221 /** 11222 * Merge your own state values in <var>additionalState</var> into the base 11223 * state values <var>baseState</var> that were returned by 11224 * {@link #onCreateDrawableState(int)}. 11225 * 11226 * @param baseState The base state values returned by 11227 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 11228 * own additional state values. 11229 * 11230 * @param additionalState The additional state values you would like 11231 * added to <var>baseState</var>; this array is not modified. 11232 * 11233 * @return As a convenience, the <var>baseState</var> array you originally 11234 * passed into the function is returned. 11235 * 11236 * @see #onCreateDrawableState(int) 11237 */ 11238 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 11239 final int N = baseState.length; 11240 int i = N - 1; 11241 while (i >= 0 && baseState[i] == 0) { 11242 i--; 11243 } 11244 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 11245 return baseState; 11246 } 11247 11248 /** 11249 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 11250 * on all Drawable objects associated with this view. 11251 */ 11252 public void jumpDrawablesToCurrentState() { 11253 if (mBGDrawable != null) { 11254 mBGDrawable.jumpToCurrentState(); 11255 } 11256 } 11257 11258 /** 11259 * Sets the background color for this view. 11260 * @param color the color of the background 11261 */ 11262 @RemotableViewMethod 11263 public void setBackgroundColor(int color) { 11264 if (mBGDrawable instanceof ColorDrawable) { 11265 ((ColorDrawable) mBGDrawable).setColor(color); 11266 } else { 11267 setBackgroundDrawable(new ColorDrawable(color)); 11268 } 11269 } 11270 11271 /** 11272 * Set the background to a given resource. The resource should refer to 11273 * a Drawable object or 0 to remove the background. 11274 * @param resid The identifier of the resource. 11275 * @attr ref android.R.styleable#View_background 11276 */ 11277 @RemotableViewMethod 11278 public void setBackgroundResource(int resid) { 11279 if (resid != 0 && resid == mBackgroundResource) { 11280 return; 11281 } 11282 11283 Drawable d= null; 11284 if (resid != 0) { 11285 d = mResources.getDrawable(resid); 11286 } 11287 setBackgroundDrawable(d); 11288 11289 mBackgroundResource = resid; 11290 } 11291 11292 /** 11293 * Set the background to a given Drawable, or remove the background. If the 11294 * background has padding, this View's padding is set to the background's 11295 * padding. However, when a background is removed, this View's padding isn't 11296 * touched. If setting the padding is desired, please use 11297 * {@link #setPadding(int, int, int, int)}. 11298 * 11299 * @param d The Drawable to use as the background, or null to remove the 11300 * background 11301 */ 11302 public void setBackgroundDrawable(Drawable d) { 11303 if (d == mBGDrawable) { 11304 return; 11305 } 11306 11307 boolean requestLayout = false; 11308 11309 mBackgroundResource = 0; 11310 11311 /* 11312 * Regardless of whether we're setting a new background or not, we want 11313 * to clear the previous drawable. 11314 */ 11315 if (mBGDrawable != null) { 11316 mBGDrawable.setCallback(null); 11317 unscheduleDrawable(mBGDrawable); 11318 } 11319 11320 if (d != null) { 11321 Rect padding = sThreadLocal.get(); 11322 if (padding == null) { 11323 padding = new Rect(); 11324 sThreadLocal.set(padding); 11325 } 11326 if (d.getPadding(padding)) { 11327 switch (d.getResolvedLayoutDirectionSelf()) { 11328 case LAYOUT_DIRECTION_RTL: 11329 setPadding(padding.right, padding.top, padding.left, padding.bottom); 11330 break; 11331 case LAYOUT_DIRECTION_LTR: 11332 default: 11333 setPadding(padding.left, padding.top, padding.right, padding.bottom); 11334 } 11335 } 11336 11337 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 11338 // if it has a different minimum size, we should layout again 11339 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 11340 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 11341 requestLayout = true; 11342 } 11343 11344 d.setCallback(this); 11345 if (d.isStateful()) { 11346 d.setState(getDrawableState()); 11347 } 11348 d.setVisible(getVisibility() == VISIBLE, false); 11349 mBGDrawable = d; 11350 11351 if ((mPrivateFlags & SKIP_DRAW) != 0) { 11352 mPrivateFlags &= ~SKIP_DRAW; 11353 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 11354 requestLayout = true; 11355 } 11356 } else { 11357 /* Remove the background */ 11358 mBGDrawable = null; 11359 11360 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 11361 /* 11362 * This view ONLY drew the background before and we're removing 11363 * the background, so now it won't draw anything 11364 * (hence we SKIP_DRAW) 11365 */ 11366 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 11367 mPrivateFlags |= SKIP_DRAW; 11368 } 11369 11370 /* 11371 * When the background is set, we try to apply its padding to this 11372 * View. When the background is removed, we don't touch this View's 11373 * padding. This is noted in the Javadocs. Hence, we don't need to 11374 * requestLayout(), the invalidate() below is sufficient. 11375 */ 11376 11377 // The old background's minimum size could have affected this 11378 // View's layout, so let's requestLayout 11379 requestLayout = true; 11380 } 11381 11382 computeOpaqueFlags(); 11383 11384 if (requestLayout) { 11385 requestLayout(); 11386 } 11387 11388 mBackgroundSizeChanged = true; 11389 invalidate(true); 11390 } 11391 11392 /** 11393 * Gets the background drawable 11394 * @return The drawable used as the background for this view, if any. 11395 */ 11396 public Drawable getBackground() { 11397 return mBGDrawable; 11398 } 11399 11400 /** 11401 * Sets the padding. The view may add on the space required to display 11402 * the scrollbars, depending on the style and visibility of the scrollbars. 11403 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 11404 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 11405 * from the values set in this call. 11406 * 11407 * @attr ref android.R.styleable#View_padding 11408 * @attr ref android.R.styleable#View_paddingBottom 11409 * @attr ref android.R.styleable#View_paddingLeft 11410 * @attr ref android.R.styleable#View_paddingRight 11411 * @attr ref android.R.styleable#View_paddingTop 11412 * @param left the left padding in pixels 11413 * @param top the top padding in pixels 11414 * @param right the right padding in pixels 11415 * @param bottom the bottom padding in pixels 11416 */ 11417 public void setPadding(int left, int top, int right, int bottom) { 11418 boolean changed = false; 11419 11420 mUserPaddingRelative = false; 11421 11422 mUserPaddingLeft = left; 11423 mUserPaddingRight = right; 11424 mUserPaddingBottom = bottom; 11425 11426 final int viewFlags = mViewFlags; 11427 11428 // Common case is there are no scroll bars. 11429 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 11430 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 11431 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 11432 ? 0 : getVerticalScrollbarWidth(); 11433 switch (mVerticalScrollbarPosition) { 11434 case SCROLLBAR_POSITION_DEFAULT: 11435 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11436 left += offset; 11437 } else { 11438 right += offset; 11439 } 11440 break; 11441 case SCROLLBAR_POSITION_RIGHT: 11442 right += offset; 11443 break; 11444 case SCROLLBAR_POSITION_LEFT: 11445 left += offset; 11446 break; 11447 } 11448 } 11449 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 11450 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 11451 ? 0 : getHorizontalScrollbarHeight(); 11452 } 11453 } 11454 11455 if (mPaddingLeft != left) { 11456 changed = true; 11457 mPaddingLeft = left; 11458 } 11459 if (mPaddingTop != top) { 11460 changed = true; 11461 mPaddingTop = top; 11462 } 11463 if (mPaddingRight != right) { 11464 changed = true; 11465 mPaddingRight = right; 11466 } 11467 if (mPaddingBottom != bottom) { 11468 changed = true; 11469 mPaddingBottom = bottom; 11470 } 11471 11472 if (changed) { 11473 requestLayout(); 11474 } 11475 } 11476 11477 /** 11478 * Sets the relative padding. The view may add on the space required to display 11479 * the scrollbars, depending on the style and visibility of the scrollbars. 11480 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 11481 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 11482 * from the values set in this call. 11483 * 11484 * @attr ref android.R.styleable#View_padding 11485 * @attr ref android.R.styleable#View_paddingBottom 11486 * @attr ref android.R.styleable#View_paddingStart 11487 * @attr ref android.R.styleable#View_paddingEnd 11488 * @attr ref android.R.styleable#View_paddingTop 11489 * @param start the start padding in pixels 11490 * @param top the top padding in pixels 11491 * @param end the end padding in pixels 11492 * @param bottom the bottom padding in pixels 11493 * 11494 * @hide 11495 */ 11496 public void setPaddingRelative(int start, int top, int end, int bottom) { 11497 mUserPaddingRelative = true; 11498 11499 mUserPaddingStart = start; 11500 mUserPaddingEnd = end; 11501 11502 switch(getResolvedLayoutDirection()) { 11503 case LAYOUT_DIRECTION_RTL: 11504 setPadding(end, top, start, bottom); 11505 break; 11506 case LAYOUT_DIRECTION_LTR: 11507 default: 11508 setPadding(start, top, end, bottom); 11509 } 11510 } 11511 11512 /** 11513 * Returns the top padding of this view. 11514 * 11515 * @return the top padding in pixels 11516 */ 11517 public int getPaddingTop() { 11518 return mPaddingTop; 11519 } 11520 11521 /** 11522 * Returns the bottom padding of this view. If there are inset and enabled 11523 * scrollbars, this value may include the space required to display the 11524 * scrollbars as well. 11525 * 11526 * @return the bottom padding in pixels 11527 */ 11528 public int getPaddingBottom() { 11529 return mPaddingBottom; 11530 } 11531 11532 /** 11533 * Returns the left padding of this view. If there are inset and enabled 11534 * scrollbars, this value may include the space required to display the 11535 * scrollbars as well. 11536 * 11537 * @return the left padding in pixels 11538 */ 11539 public int getPaddingLeft() { 11540 return mPaddingLeft; 11541 } 11542 11543 /** 11544 * Returns the start padding of this view. If there are inset and enabled 11545 * scrollbars, this value may include the space required to display the 11546 * scrollbars as well. 11547 * 11548 * @return the start padding in pixels 11549 * 11550 * @hide 11551 */ 11552 public int getPaddingStart() { 11553 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11554 mPaddingRight : mPaddingLeft; 11555 } 11556 11557 /** 11558 * Returns the right padding of this view. If there are inset and enabled 11559 * scrollbars, this value may include the space required to display the 11560 * scrollbars as well. 11561 * 11562 * @return the right padding in pixels 11563 */ 11564 public int getPaddingRight() { 11565 return mPaddingRight; 11566 } 11567 11568 /** 11569 * Returns the end padding of this view. If there are inset and enabled 11570 * scrollbars, this value may include the space required to display the 11571 * scrollbars as well. 11572 * 11573 * @return the end padding in pixels 11574 * 11575 * @hide 11576 */ 11577 public int getPaddingEnd() { 11578 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11579 mPaddingLeft : mPaddingRight; 11580 } 11581 11582 /** 11583 * Return if the padding as been set thru relative values 11584 * {@link #setPaddingRelative(int, int, int, int)} or thru 11585 * @attr ref android.R.styleable#View_paddingStart or 11586 * @attr ref android.R.styleable#View_paddingEnd 11587 * 11588 * @return true if the padding is relative or false if it is not. 11589 * 11590 * @hide 11591 */ 11592 public boolean isPaddingRelative() { 11593 return mUserPaddingRelative; 11594 } 11595 11596 /** 11597 * Changes the selection state of this view. A view can be selected or not. 11598 * Note that selection is not the same as focus. Views are typically 11599 * selected in the context of an AdapterView like ListView or GridView; 11600 * the selected view is the view that is highlighted. 11601 * 11602 * @param selected true if the view must be selected, false otherwise 11603 */ 11604 public void setSelected(boolean selected) { 11605 if (((mPrivateFlags & SELECTED) != 0) != selected) { 11606 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 11607 if (!selected) resetPressedState(); 11608 invalidate(true); 11609 refreshDrawableState(); 11610 dispatchSetSelected(selected); 11611 } 11612 } 11613 11614 /** 11615 * Dispatch setSelected to all of this View's children. 11616 * 11617 * @see #setSelected(boolean) 11618 * 11619 * @param selected The new selected state 11620 */ 11621 protected void dispatchSetSelected(boolean selected) { 11622 } 11623 11624 /** 11625 * Indicates the selection state of this view. 11626 * 11627 * @return true if the view is selected, false otherwise 11628 */ 11629 @ViewDebug.ExportedProperty 11630 public boolean isSelected() { 11631 return (mPrivateFlags & SELECTED) != 0; 11632 } 11633 11634 /** 11635 * Changes the activated state of this view. A view can be activated or not. 11636 * Note that activation is not the same as selection. Selection is 11637 * a transient property, representing the view (hierarchy) the user is 11638 * currently interacting with. Activation is a longer-term state that the 11639 * user can move views in and out of. For example, in a list view with 11640 * single or multiple selection enabled, the views in the current selection 11641 * set are activated. (Um, yeah, we are deeply sorry about the terminology 11642 * here.) The activated state is propagated down to children of the view it 11643 * is set on. 11644 * 11645 * @param activated true if the view must be activated, false otherwise 11646 */ 11647 public void setActivated(boolean activated) { 11648 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 11649 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 11650 invalidate(true); 11651 refreshDrawableState(); 11652 dispatchSetActivated(activated); 11653 } 11654 } 11655 11656 /** 11657 * Dispatch setActivated to all of this View's children. 11658 * 11659 * @see #setActivated(boolean) 11660 * 11661 * @param activated The new activated state 11662 */ 11663 protected void dispatchSetActivated(boolean activated) { 11664 } 11665 11666 /** 11667 * Indicates the activation state of this view. 11668 * 11669 * @return true if the view is activated, false otherwise 11670 */ 11671 @ViewDebug.ExportedProperty 11672 public boolean isActivated() { 11673 return (mPrivateFlags & ACTIVATED) != 0; 11674 } 11675 11676 /** 11677 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 11678 * observer can be used to get notifications when global events, like 11679 * layout, happen. 11680 * 11681 * The returned ViewTreeObserver observer is not guaranteed to remain 11682 * valid for the lifetime of this View. If the caller of this method keeps 11683 * a long-lived reference to ViewTreeObserver, it should always check for 11684 * the return value of {@link ViewTreeObserver#isAlive()}. 11685 * 11686 * @return The ViewTreeObserver for this view's hierarchy. 11687 */ 11688 public ViewTreeObserver getViewTreeObserver() { 11689 if (mAttachInfo != null) { 11690 return mAttachInfo.mTreeObserver; 11691 } 11692 if (mFloatingTreeObserver == null) { 11693 mFloatingTreeObserver = new ViewTreeObserver(); 11694 } 11695 return mFloatingTreeObserver; 11696 } 11697 11698 /** 11699 * <p>Finds the topmost view in the current view hierarchy.</p> 11700 * 11701 * @return the topmost view containing this view 11702 */ 11703 public View getRootView() { 11704 if (mAttachInfo != null) { 11705 final View v = mAttachInfo.mRootView; 11706 if (v != null) { 11707 return v; 11708 } 11709 } 11710 11711 View parent = this; 11712 11713 while (parent.mParent != null && parent.mParent instanceof View) { 11714 parent = (View) parent.mParent; 11715 } 11716 11717 return parent; 11718 } 11719 11720 /** 11721 * <p>Computes the coordinates of this view on the screen. The argument 11722 * must be an array of two integers. After the method returns, the array 11723 * contains the x and y location in that order.</p> 11724 * 11725 * @param location an array of two integers in which to hold the coordinates 11726 */ 11727 public void getLocationOnScreen(int[] location) { 11728 getLocationInWindow(location); 11729 11730 final AttachInfo info = mAttachInfo; 11731 if (info != null) { 11732 location[0] += info.mWindowLeft; 11733 location[1] += info.mWindowTop; 11734 } 11735 } 11736 11737 /** 11738 * <p>Computes the coordinates of this view in its window. The argument 11739 * must be an array of two integers. After the method returns, the array 11740 * contains the x and y location in that order.</p> 11741 * 11742 * @param location an array of two integers in which to hold the coordinates 11743 */ 11744 public void getLocationInWindow(int[] location) { 11745 if (location == null || location.length < 2) { 11746 throw new IllegalArgumentException("location must be an array of " 11747 + "two integers"); 11748 } 11749 11750 location[0] = mLeft + (int) (mTranslationX + 0.5f); 11751 location[1] = mTop + (int) (mTranslationY + 0.5f); 11752 11753 ViewParent viewParent = mParent; 11754 while (viewParent instanceof View) { 11755 final View view = (View)viewParent; 11756 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 11757 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 11758 viewParent = view.mParent; 11759 } 11760 11761 if (viewParent instanceof ViewRootImpl) { 11762 // *cough* 11763 final ViewRootImpl vr = (ViewRootImpl)viewParent; 11764 location[1] -= vr.mCurScrollY; 11765 } 11766 } 11767 11768 /** 11769 * {@hide} 11770 * @param id the id of the view to be found 11771 * @return the view of the specified id, null if cannot be found 11772 */ 11773 protected View findViewTraversal(int id) { 11774 if (id == mID) { 11775 return this; 11776 } 11777 return null; 11778 } 11779 11780 /** 11781 * {@hide} 11782 * @param tag the tag of the view to be found 11783 * @return the view of specified tag, null if cannot be found 11784 */ 11785 protected View findViewWithTagTraversal(Object tag) { 11786 if (tag != null && tag.equals(mTag)) { 11787 return this; 11788 } 11789 return null; 11790 } 11791 11792 /** 11793 * {@hide} 11794 * @param predicate The predicate to evaluate. 11795 * @param childToSkip If not null, ignores this child during the recursive traversal. 11796 * @return The first view that matches the predicate or null. 11797 */ 11798 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 11799 if (predicate.apply(this)) { 11800 return this; 11801 } 11802 return null; 11803 } 11804 11805 /** 11806 * Look for a child view with the given id. If this view has the given 11807 * id, return this view. 11808 * 11809 * @param id The id to search for. 11810 * @return The view that has the given id in the hierarchy or null 11811 */ 11812 public final View findViewById(int id) { 11813 if (id < 0) { 11814 return null; 11815 } 11816 return findViewTraversal(id); 11817 } 11818 11819 /** 11820 * Look for a child view with the given tag. If this view has the given 11821 * tag, return this view. 11822 * 11823 * @param tag The tag to search for, using "tag.equals(getTag())". 11824 * @return The View that has the given tag in the hierarchy or null 11825 */ 11826 public final View findViewWithTag(Object tag) { 11827 if (tag == null) { 11828 return null; 11829 } 11830 return findViewWithTagTraversal(tag); 11831 } 11832 11833 /** 11834 * {@hide} 11835 * Look for a child view that matches the specified predicate. 11836 * If this view matches the predicate, return this view. 11837 * 11838 * @param predicate The predicate to evaluate. 11839 * @return The first view that matches the predicate or null. 11840 */ 11841 public final View findViewByPredicate(Predicate<View> predicate) { 11842 return findViewByPredicateTraversal(predicate, null); 11843 } 11844 11845 /** 11846 * {@hide} 11847 * Look for a child view that matches the specified predicate, 11848 * starting with the specified view and its descendents and then 11849 * recusively searching the ancestors and siblings of that view 11850 * until this view is reached. 11851 * 11852 * This method is useful in cases where the predicate does not match 11853 * a single unique view (perhaps multiple views use the same id) 11854 * and we are trying to find the view that is "closest" in scope to the 11855 * starting view. 11856 * 11857 * @param start The view to start from. 11858 * @param predicate The predicate to evaluate. 11859 * @return The first view that matches the predicate or null. 11860 */ 11861 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 11862 View childToSkip = null; 11863 for (;;) { 11864 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 11865 if (view != null || start == this) { 11866 return view; 11867 } 11868 11869 ViewParent parent = start.getParent(); 11870 if (parent == null || !(parent instanceof View)) { 11871 return null; 11872 } 11873 11874 childToSkip = start; 11875 start = (View) parent; 11876 } 11877 } 11878 11879 /** 11880 * Sets the identifier for this view. The identifier does not have to be 11881 * unique in this view's hierarchy. The identifier should be a positive 11882 * number. 11883 * 11884 * @see #NO_ID 11885 * @see #getId() 11886 * @see #findViewById(int) 11887 * 11888 * @param id a number used to identify the view 11889 * 11890 * @attr ref android.R.styleable#View_id 11891 */ 11892 public void setId(int id) { 11893 mID = id; 11894 } 11895 11896 /** 11897 * {@hide} 11898 * 11899 * @param isRoot true if the view belongs to the root namespace, false 11900 * otherwise 11901 */ 11902 public void setIsRootNamespace(boolean isRoot) { 11903 if (isRoot) { 11904 mPrivateFlags |= IS_ROOT_NAMESPACE; 11905 } else { 11906 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 11907 } 11908 } 11909 11910 /** 11911 * {@hide} 11912 * 11913 * @return true if the view belongs to the root namespace, false otherwise 11914 */ 11915 public boolean isRootNamespace() { 11916 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 11917 } 11918 11919 /** 11920 * Returns this view's identifier. 11921 * 11922 * @return a positive integer used to identify the view or {@link #NO_ID} 11923 * if the view has no ID 11924 * 11925 * @see #setId(int) 11926 * @see #findViewById(int) 11927 * @attr ref android.R.styleable#View_id 11928 */ 11929 @ViewDebug.CapturedViewProperty 11930 public int getId() { 11931 return mID; 11932 } 11933 11934 /** 11935 * Returns this view's tag. 11936 * 11937 * @return the Object stored in this view as a tag 11938 * 11939 * @see #setTag(Object) 11940 * @see #getTag(int) 11941 */ 11942 @ViewDebug.ExportedProperty 11943 public Object getTag() { 11944 return mTag; 11945 } 11946 11947 /** 11948 * Sets the tag associated with this view. A tag can be used to mark 11949 * a view in its hierarchy and does not have to be unique within the 11950 * hierarchy. Tags can also be used to store data within a view without 11951 * resorting to another data structure. 11952 * 11953 * @param tag an Object to tag the view with 11954 * 11955 * @see #getTag() 11956 * @see #setTag(int, Object) 11957 */ 11958 public void setTag(final Object tag) { 11959 mTag = tag; 11960 } 11961 11962 /** 11963 * Returns the tag associated with this view and the specified key. 11964 * 11965 * @param key The key identifying the tag 11966 * 11967 * @return the Object stored in this view as a tag 11968 * 11969 * @see #setTag(int, Object) 11970 * @see #getTag() 11971 */ 11972 public Object getTag(int key) { 11973 SparseArray<Object> tags = null; 11974 synchronized (sTagsLock) { 11975 if (sTags != null) { 11976 tags = sTags.get(this); 11977 } 11978 } 11979 11980 if (tags != null) return tags.get(key); 11981 return null; 11982 } 11983 11984 /** 11985 * Sets a tag associated with this view and a key. A tag can be used 11986 * to mark a view in its hierarchy and does not have to be unique within 11987 * the hierarchy. Tags can also be used to store data within a view 11988 * without resorting to another data structure. 11989 * 11990 * The specified key should be an id declared in the resources of the 11991 * application to ensure it is unique (see the <a 11992 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 11993 * Keys identified as belonging to 11994 * the Android framework or not associated with any package will cause 11995 * an {@link IllegalArgumentException} to be thrown. 11996 * 11997 * @param key The key identifying the tag 11998 * @param tag An Object to tag the view with 11999 * 12000 * @throws IllegalArgumentException If they specified key is not valid 12001 * 12002 * @see #setTag(Object) 12003 * @see #getTag(int) 12004 */ 12005 public void setTag(int key, final Object tag) { 12006 // If the package id is 0x00 or 0x01, it's either an undefined package 12007 // or a framework id 12008 if ((key >>> 24) < 2) { 12009 throw new IllegalArgumentException("The key must be an application-specific " 12010 + "resource id."); 12011 } 12012 12013 setTagInternal(this, key, tag); 12014 } 12015 12016 /** 12017 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 12018 * framework id. 12019 * 12020 * @hide 12021 */ 12022 public void setTagInternal(int key, Object tag) { 12023 if ((key >>> 24) != 0x1) { 12024 throw new IllegalArgumentException("The key must be a framework-specific " 12025 + "resource id."); 12026 } 12027 12028 setTagInternal(this, key, tag); 12029 } 12030 12031 private static void setTagInternal(View view, int key, Object tag) { 12032 SparseArray<Object> tags = null; 12033 synchronized (sTagsLock) { 12034 if (sTags == null) { 12035 sTags = new WeakHashMap<View, SparseArray<Object>>(); 12036 } else { 12037 tags = sTags.get(view); 12038 } 12039 } 12040 12041 if (tags == null) { 12042 tags = new SparseArray<Object>(2); 12043 synchronized (sTagsLock) { 12044 sTags.put(view, tags); 12045 } 12046 } 12047 12048 tags.put(key, tag); 12049 } 12050 12051 /** 12052 * @param consistency The type of consistency. See ViewDebug for more information. 12053 * 12054 * @hide 12055 */ 12056 protected boolean dispatchConsistencyCheck(int consistency) { 12057 return onConsistencyCheck(consistency); 12058 } 12059 12060 /** 12061 * Method that subclasses should implement to check their consistency. The type of 12062 * consistency check is indicated by the bit field passed as a parameter. 12063 * 12064 * @param consistency The type of consistency. See ViewDebug for more information. 12065 * 12066 * @throws IllegalStateException if the view is in an inconsistent state. 12067 * 12068 * @hide 12069 */ 12070 protected boolean onConsistencyCheck(int consistency) { 12071 boolean result = true; 12072 12073 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 12074 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 12075 12076 if (checkLayout) { 12077 if (getParent() == null) { 12078 result = false; 12079 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12080 "View " + this + " does not have a parent."); 12081 } 12082 12083 if (mAttachInfo == null) { 12084 result = false; 12085 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12086 "View " + this + " is not attached to a window."); 12087 } 12088 } 12089 12090 if (checkDrawing) { 12091 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 12092 // from their draw() method 12093 12094 if ((mPrivateFlags & DRAWN) != DRAWN && 12095 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 12096 result = false; 12097 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12098 "View " + this + " was invalidated but its drawing cache is valid."); 12099 } 12100 } 12101 12102 return result; 12103 } 12104 12105 /** 12106 * Prints information about this view in the log output, with the tag 12107 * {@link #VIEW_LOG_TAG}. 12108 * 12109 * @hide 12110 */ 12111 public void debug() { 12112 debug(0); 12113 } 12114 12115 /** 12116 * Prints information about this view in the log output, with the tag 12117 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 12118 * indentation defined by the <code>depth</code>. 12119 * 12120 * @param depth the indentation level 12121 * 12122 * @hide 12123 */ 12124 protected void debug(int depth) { 12125 String output = debugIndent(depth - 1); 12126 12127 output += "+ " + this; 12128 int id = getId(); 12129 if (id != -1) { 12130 output += " (id=" + id + ")"; 12131 } 12132 Object tag = getTag(); 12133 if (tag != null) { 12134 output += " (tag=" + tag + ")"; 12135 } 12136 Log.d(VIEW_LOG_TAG, output); 12137 12138 if ((mPrivateFlags & FOCUSED) != 0) { 12139 output = debugIndent(depth) + " FOCUSED"; 12140 Log.d(VIEW_LOG_TAG, output); 12141 } 12142 12143 output = debugIndent(depth); 12144 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 12145 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 12146 + "} "; 12147 Log.d(VIEW_LOG_TAG, output); 12148 12149 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 12150 || mPaddingBottom != 0) { 12151 output = debugIndent(depth); 12152 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 12153 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 12154 Log.d(VIEW_LOG_TAG, output); 12155 } 12156 12157 output = debugIndent(depth); 12158 output += "mMeasureWidth=" + mMeasuredWidth + 12159 " mMeasureHeight=" + mMeasuredHeight; 12160 Log.d(VIEW_LOG_TAG, output); 12161 12162 output = debugIndent(depth); 12163 if (mLayoutParams == null) { 12164 output += "BAD! no layout params"; 12165 } else { 12166 output = mLayoutParams.debug(output); 12167 } 12168 Log.d(VIEW_LOG_TAG, output); 12169 12170 output = debugIndent(depth); 12171 output += "flags={"; 12172 output += View.printFlags(mViewFlags); 12173 output += "}"; 12174 Log.d(VIEW_LOG_TAG, output); 12175 12176 output = debugIndent(depth); 12177 output += "privateFlags={"; 12178 output += View.printPrivateFlags(mPrivateFlags); 12179 output += "}"; 12180 Log.d(VIEW_LOG_TAG, output); 12181 } 12182 12183 /** 12184 * Creates an string of whitespaces used for indentation. 12185 * 12186 * @param depth the indentation level 12187 * @return a String containing (depth * 2 + 3) * 2 white spaces 12188 * 12189 * @hide 12190 */ 12191 protected static String debugIndent(int depth) { 12192 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 12193 for (int i = 0; i < (depth * 2) + 3; i++) { 12194 spaces.append(' ').append(' '); 12195 } 12196 return spaces.toString(); 12197 } 12198 12199 /** 12200 * <p>Return the offset of the widget's text baseline from the widget's top 12201 * boundary. If this widget does not support baseline alignment, this 12202 * method returns -1. </p> 12203 * 12204 * @return the offset of the baseline within the widget's bounds or -1 12205 * if baseline alignment is not supported 12206 */ 12207 @ViewDebug.ExportedProperty(category = "layout") 12208 public int getBaseline() { 12209 return -1; 12210 } 12211 12212 /** 12213 * Call this when something has changed which has invalidated the 12214 * layout of this view. This will schedule a layout pass of the view 12215 * tree. 12216 */ 12217 public void requestLayout() { 12218 if (ViewDebug.TRACE_HIERARCHY) { 12219 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 12220 } 12221 12222 mPrivateFlags |= FORCE_LAYOUT; 12223 mPrivateFlags |= INVALIDATED; 12224 12225 if (mParent != null) { 12226 if (mLayoutParams != null) { 12227 mLayoutParams.resolveWithDirection(getResolvedLayoutDirection()); 12228 } 12229 if (!mParent.isLayoutRequested()) { 12230 mParent.requestLayout(); 12231 } 12232 } 12233 } 12234 12235 /** 12236 * Forces this view to be laid out during the next layout pass. 12237 * This method does not call requestLayout() or forceLayout() 12238 * on the parent. 12239 */ 12240 public void forceLayout() { 12241 mPrivateFlags |= FORCE_LAYOUT; 12242 mPrivateFlags |= INVALIDATED; 12243 } 12244 12245 /** 12246 * <p> 12247 * This is called to find out how big a view should be. The parent 12248 * supplies constraint information in the width and height parameters. 12249 * </p> 12250 * 12251 * <p> 12252 * The actual mesurement work of a view is performed in 12253 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 12254 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 12255 * </p> 12256 * 12257 * 12258 * @param widthMeasureSpec Horizontal space requirements as imposed by the 12259 * parent 12260 * @param heightMeasureSpec Vertical space requirements as imposed by the 12261 * parent 12262 * 12263 * @see #onMeasure(int, int) 12264 */ 12265 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 12266 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 12267 widthMeasureSpec != mOldWidthMeasureSpec || 12268 heightMeasureSpec != mOldHeightMeasureSpec) { 12269 12270 // first clears the measured dimension flag 12271 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 12272 12273 if (ViewDebug.TRACE_HIERARCHY) { 12274 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 12275 } 12276 12277 // measure ourselves, this should set the measured dimension flag back 12278 onMeasure(widthMeasureSpec, heightMeasureSpec); 12279 12280 // flag not set, setMeasuredDimension() was not invoked, we raise 12281 // an exception to warn the developer 12282 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 12283 throw new IllegalStateException("onMeasure() did not set the" 12284 + " measured dimension by calling" 12285 + " setMeasuredDimension()"); 12286 } 12287 12288 mPrivateFlags |= LAYOUT_REQUIRED; 12289 } 12290 12291 mOldWidthMeasureSpec = widthMeasureSpec; 12292 mOldHeightMeasureSpec = heightMeasureSpec; 12293 } 12294 12295 /** 12296 * <p> 12297 * Measure the view and its content to determine the measured width and the 12298 * measured height. This method is invoked by {@link #measure(int, int)} and 12299 * should be overriden by subclasses to provide accurate and efficient 12300 * measurement of their contents. 12301 * </p> 12302 * 12303 * <p> 12304 * <strong>CONTRACT:</strong> When overriding this method, you 12305 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 12306 * measured width and height of this view. Failure to do so will trigger an 12307 * <code>IllegalStateException</code>, thrown by 12308 * {@link #measure(int, int)}. Calling the superclass' 12309 * {@link #onMeasure(int, int)} is a valid use. 12310 * </p> 12311 * 12312 * <p> 12313 * The base class implementation of measure defaults to the background size, 12314 * unless a larger size is allowed by the MeasureSpec. Subclasses should 12315 * override {@link #onMeasure(int, int)} to provide better measurements of 12316 * their content. 12317 * </p> 12318 * 12319 * <p> 12320 * If this method is overridden, it is the subclass's responsibility to make 12321 * sure the measured height and width are at least the view's minimum height 12322 * and width ({@link #getSuggestedMinimumHeight()} and 12323 * {@link #getSuggestedMinimumWidth()}). 12324 * </p> 12325 * 12326 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 12327 * The requirements are encoded with 12328 * {@link android.view.View.MeasureSpec}. 12329 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 12330 * The requirements are encoded with 12331 * {@link android.view.View.MeasureSpec}. 12332 * 12333 * @see #getMeasuredWidth() 12334 * @see #getMeasuredHeight() 12335 * @see #setMeasuredDimension(int, int) 12336 * @see #getSuggestedMinimumHeight() 12337 * @see #getSuggestedMinimumWidth() 12338 * @see android.view.View.MeasureSpec#getMode(int) 12339 * @see android.view.View.MeasureSpec#getSize(int) 12340 */ 12341 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 12342 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 12343 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 12344 } 12345 12346 /** 12347 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 12348 * measured width and measured height. Failing to do so will trigger an 12349 * exception at measurement time.</p> 12350 * 12351 * @param measuredWidth The measured width of this view. May be a complex 12352 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12353 * {@link #MEASURED_STATE_TOO_SMALL}. 12354 * @param measuredHeight The measured height of this view. May be a complex 12355 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12356 * {@link #MEASURED_STATE_TOO_SMALL}. 12357 */ 12358 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 12359 mMeasuredWidth = measuredWidth; 12360 mMeasuredHeight = measuredHeight; 12361 12362 mPrivateFlags |= MEASURED_DIMENSION_SET; 12363 } 12364 12365 /** 12366 * Merge two states as returned by {@link #getMeasuredState()}. 12367 * @param curState The current state as returned from a view or the result 12368 * of combining multiple views. 12369 * @param newState The new view state to combine. 12370 * @return Returns a new integer reflecting the combination of the two 12371 * states. 12372 */ 12373 public static int combineMeasuredStates(int curState, int newState) { 12374 return curState | newState; 12375 } 12376 12377 /** 12378 * Version of {@link #resolveSizeAndState(int, int, int)} 12379 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 12380 */ 12381 public static int resolveSize(int size, int measureSpec) { 12382 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 12383 } 12384 12385 /** 12386 * Utility to reconcile a desired size and state, with constraints imposed 12387 * by a MeasureSpec. Will take the desired size, unless a different size 12388 * is imposed by the constraints. The returned value is a compound integer, 12389 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 12390 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 12391 * size is smaller than the size the view wants to be. 12392 * 12393 * @param size How big the view wants to be 12394 * @param measureSpec Constraints imposed by the parent 12395 * @return Size information bit mask as defined by 12396 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 12397 */ 12398 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 12399 int result = size; 12400 int specMode = MeasureSpec.getMode(measureSpec); 12401 int specSize = MeasureSpec.getSize(measureSpec); 12402 switch (specMode) { 12403 case MeasureSpec.UNSPECIFIED: 12404 result = size; 12405 break; 12406 case MeasureSpec.AT_MOST: 12407 if (specSize < size) { 12408 result = specSize | MEASURED_STATE_TOO_SMALL; 12409 } else { 12410 result = size; 12411 } 12412 break; 12413 case MeasureSpec.EXACTLY: 12414 result = specSize; 12415 break; 12416 } 12417 return result | (childMeasuredState&MEASURED_STATE_MASK); 12418 } 12419 12420 /** 12421 * Utility to return a default size. Uses the supplied size if the 12422 * MeasureSpec imposed no constraints. Will get larger if allowed 12423 * by the MeasureSpec. 12424 * 12425 * @param size Default size for this view 12426 * @param measureSpec Constraints imposed by the parent 12427 * @return The size this view should be. 12428 */ 12429 public static int getDefaultSize(int size, int measureSpec) { 12430 int result = size; 12431 int specMode = MeasureSpec.getMode(measureSpec); 12432 int specSize = MeasureSpec.getSize(measureSpec); 12433 12434 switch (specMode) { 12435 case MeasureSpec.UNSPECIFIED: 12436 result = size; 12437 break; 12438 case MeasureSpec.AT_MOST: 12439 case MeasureSpec.EXACTLY: 12440 result = specSize; 12441 break; 12442 } 12443 return result; 12444 } 12445 12446 /** 12447 * Returns the suggested minimum height that the view should use. This 12448 * returns the maximum of the view's minimum height 12449 * and the background's minimum height 12450 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 12451 * <p> 12452 * When being used in {@link #onMeasure(int, int)}, the caller should still 12453 * ensure the returned height is within the requirements of the parent. 12454 * 12455 * @return The suggested minimum height of the view. 12456 */ 12457 protected int getSuggestedMinimumHeight() { 12458 int suggestedMinHeight = mMinHeight; 12459 12460 if (mBGDrawable != null) { 12461 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 12462 if (suggestedMinHeight < bgMinHeight) { 12463 suggestedMinHeight = bgMinHeight; 12464 } 12465 } 12466 12467 return suggestedMinHeight; 12468 } 12469 12470 /** 12471 * Returns the suggested minimum width that the view should use. This 12472 * returns the maximum of the view's minimum width) 12473 * and the background's minimum width 12474 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 12475 * <p> 12476 * When being used in {@link #onMeasure(int, int)}, the caller should still 12477 * ensure the returned width is within the requirements of the parent. 12478 * 12479 * @return The suggested minimum width of the view. 12480 */ 12481 protected int getSuggestedMinimumWidth() { 12482 int suggestedMinWidth = mMinWidth; 12483 12484 if (mBGDrawable != null) { 12485 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 12486 if (suggestedMinWidth < bgMinWidth) { 12487 suggestedMinWidth = bgMinWidth; 12488 } 12489 } 12490 12491 return suggestedMinWidth; 12492 } 12493 12494 /** 12495 * Sets the minimum height of the view. It is not guaranteed the view will 12496 * be able to achieve this minimum height (for example, if its parent layout 12497 * constrains it with less available height). 12498 * 12499 * @param minHeight The minimum height the view will try to be. 12500 */ 12501 public void setMinimumHeight(int minHeight) { 12502 mMinHeight = minHeight; 12503 } 12504 12505 /** 12506 * Sets the minimum width of the view. It is not guaranteed the view will 12507 * be able to achieve this minimum width (for example, if its parent layout 12508 * constrains it with less available width). 12509 * 12510 * @param minWidth The minimum width the view will try to be. 12511 */ 12512 public void setMinimumWidth(int minWidth) { 12513 mMinWidth = minWidth; 12514 } 12515 12516 /** 12517 * Get the animation currently associated with this view. 12518 * 12519 * @return The animation that is currently playing or 12520 * scheduled to play for this view. 12521 */ 12522 public Animation getAnimation() { 12523 return mCurrentAnimation; 12524 } 12525 12526 /** 12527 * Start the specified animation now. 12528 * 12529 * @param animation the animation to start now 12530 */ 12531 public void startAnimation(Animation animation) { 12532 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 12533 setAnimation(animation); 12534 invalidateParentCaches(); 12535 invalidate(true); 12536 } 12537 12538 /** 12539 * Cancels any animations for this view. 12540 */ 12541 public void clearAnimation() { 12542 if (mCurrentAnimation != null) { 12543 mCurrentAnimation.detach(); 12544 } 12545 mCurrentAnimation = null; 12546 invalidateParentIfNeeded(); 12547 } 12548 12549 /** 12550 * Sets the next animation to play for this view. 12551 * If you want the animation to play immediately, use 12552 * startAnimation. This method provides allows fine-grained 12553 * control over the start time and invalidation, but you 12554 * must make sure that 1) the animation has a start time set, and 12555 * 2) the view will be invalidated when the animation is supposed to 12556 * start. 12557 * 12558 * @param animation The next animation, or null. 12559 */ 12560 public void setAnimation(Animation animation) { 12561 mCurrentAnimation = animation; 12562 if (animation != null) { 12563 animation.reset(); 12564 } 12565 } 12566 12567 /** 12568 * Invoked by a parent ViewGroup to notify the start of the animation 12569 * currently associated with this view. If you override this method, 12570 * always call super.onAnimationStart(); 12571 * 12572 * @see #setAnimation(android.view.animation.Animation) 12573 * @see #getAnimation() 12574 */ 12575 protected void onAnimationStart() { 12576 mPrivateFlags |= ANIMATION_STARTED; 12577 } 12578 12579 /** 12580 * Invoked by a parent ViewGroup to notify the end of the animation 12581 * currently associated with this view. If you override this method, 12582 * always call super.onAnimationEnd(); 12583 * 12584 * @see #setAnimation(android.view.animation.Animation) 12585 * @see #getAnimation() 12586 */ 12587 protected void onAnimationEnd() { 12588 mPrivateFlags &= ~ANIMATION_STARTED; 12589 } 12590 12591 /** 12592 * Invoked if there is a Transform that involves alpha. Subclass that can 12593 * draw themselves with the specified alpha should return true, and then 12594 * respect that alpha when their onDraw() is called. If this returns false 12595 * then the view may be redirected to draw into an offscreen buffer to 12596 * fulfill the request, which will look fine, but may be slower than if the 12597 * subclass handles it internally. The default implementation returns false. 12598 * 12599 * @param alpha The alpha (0..255) to apply to the view's drawing 12600 * @return true if the view can draw with the specified alpha. 12601 */ 12602 protected boolean onSetAlpha(int alpha) { 12603 return false; 12604 } 12605 12606 /** 12607 * This is used by the RootView to perform an optimization when 12608 * the view hierarchy contains one or several SurfaceView. 12609 * SurfaceView is always considered transparent, but its children are not, 12610 * therefore all View objects remove themselves from the global transparent 12611 * region (passed as a parameter to this function). 12612 * 12613 * @param region The transparent region for this ViewAncestor (window). 12614 * 12615 * @return Returns true if the effective visibility of the view at this 12616 * point is opaque, regardless of the transparent region; returns false 12617 * if it is possible for underlying windows to be seen behind the view. 12618 * 12619 * {@hide} 12620 */ 12621 public boolean gatherTransparentRegion(Region region) { 12622 final AttachInfo attachInfo = mAttachInfo; 12623 if (region != null && attachInfo != null) { 12624 final int pflags = mPrivateFlags; 12625 if ((pflags & SKIP_DRAW) == 0) { 12626 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 12627 // remove it from the transparent region. 12628 final int[] location = attachInfo.mTransparentLocation; 12629 getLocationInWindow(location); 12630 region.op(location[0], location[1], location[0] + mRight - mLeft, 12631 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 12632 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 12633 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 12634 // exists, so we remove the background drawable's non-transparent 12635 // parts from this transparent region. 12636 applyDrawableToTransparentRegion(mBGDrawable, region); 12637 } 12638 } 12639 return true; 12640 } 12641 12642 /** 12643 * Play a sound effect for this view. 12644 * 12645 * <p>The framework will play sound effects for some built in actions, such as 12646 * clicking, but you may wish to play these effects in your widget, 12647 * for instance, for internal navigation. 12648 * 12649 * <p>The sound effect will only be played if sound effects are enabled by the user, and 12650 * {@link #isSoundEffectsEnabled()} is true. 12651 * 12652 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 12653 */ 12654 public void playSoundEffect(int soundConstant) { 12655 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 12656 return; 12657 } 12658 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 12659 } 12660 12661 /** 12662 * BZZZTT!!1! 12663 * 12664 * <p>Provide haptic feedback to the user for this view. 12665 * 12666 * <p>The framework will provide haptic feedback for some built in actions, 12667 * such as long presses, but you may wish to provide feedback for your 12668 * own widget. 12669 * 12670 * <p>The feedback will only be performed if 12671 * {@link #isHapticFeedbackEnabled()} is true. 12672 * 12673 * @param feedbackConstant One of the constants defined in 12674 * {@link HapticFeedbackConstants} 12675 */ 12676 public boolean performHapticFeedback(int feedbackConstant) { 12677 return performHapticFeedback(feedbackConstant, 0); 12678 } 12679 12680 /** 12681 * BZZZTT!!1! 12682 * 12683 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 12684 * 12685 * @param feedbackConstant One of the constants defined in 12686 * {@link HapticFeedbackConstants} 12687 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 12688 */ 12689 public boolean performHapticFeedback(int feedbackConstant, int flags) { 12690 if (mAttachInfo == null) { 12691 return false; 12692 } 12693 //noinspection SimplifiableIfStatement 12694 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 12695 && !isHapticFeedbackEnabled()) { 12696 return false; 12697 } 12698 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 12699 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 12700 } 12701 12702 /** 12703 * Request that the visibility of the status bar be changed. 12704 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 12705 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 12706 * 12707 * This value will be re-applied immediately, even if the flags have not changed, so a view may 12708 * easily reassert a particular SystemUiVisibility condition even if the system UI itself has 12709 * since countermanded the original request. 12710 */ 12711 public void setSystemUiVisibility(int visibility) { 12712 mSystemUiVisibility = visibility; 12713 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12714 mParent.recomputeViewAttributes(this); 12715 } 12716 } 12717 12718 /** 12719 * Returns the status bar visibility that this view has requested. 12720 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 12721 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 12722 */ 12723 public int getSystemUiVisibility() { 12724 return mSystemUiVisibility; 12725 } 12726 12727 /** 12728 * Set a listener to receive callbacks when the visibility of the system bar changes. 12729 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 12730 */ 12731 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 12732 mOnSystemUiVisibilityChangeListener = l; 12733 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12734 mParent.recomputeViewAttributes(this); 12735 } 12736 } 12737 12738 /** 12739 */ 12740 public void dispatchSystemUiVisibilityChanged(int visibility) { 12741 if (mOnSystemUiVisibilityChangeListener != null) { 12742 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 12743 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 12744 } 12745 } 12746 12747 /** 12748 * Creates an image that the system displays during the drag and drop 12749 * operation. This is called a "drag shadow". The default implementation 12750 * for a DragShadowBuilder based on a View returns an image that has exactly the same 12751 * appearance as the given View. The default also positions the center of the drag shadow 12752 * directly under the touch point. If no View is provided (the constructor with no parameters 12753 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 12754 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 12755 * default is an invisible drag shadow. 12756 * <p> 12757 * You are not required to use the View you provide to the constructor as the basis of the 12758 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 12759 * anything you want as the drag shadow. 12760 * </p> 12761 * <p> 12762 * You pass a DragShadowBuilder object to the system when you start the drag. The system 12763 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 12764 * size and position of the drag shadow. It uses this data to construct a 12765 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 12766 * so that your application can draw the shadow image in the Canvas. 12767 * </p> 12768 */ 12769 public static class DragShadowBuilder { 12770 private final WeakReference<View> mView; 12771 12772 /** 12773 * Constructs a shadow image builder based on a View. By default, the resulting drag 12774 * shadow will have the same appearance and dimensions as the View, with the touch point 12775 * over the center of the View. 12776 * @param view A View. Any View in scope can be used. 12777 */ 12778 public DragShadowBuilder(View view) { 12779 mView = new WeakReference<View>(view); 12780 } 12781 12782 /** 12783 * Construct a shadow builder object with no associated View. This 12784 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 12785 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 12786 * to supply the drag shadow's dimensions and appearance without 12787 * reference to any View object. If they are not overridden, then the result is an 12788 * invisible drag shadow. 12789 */ 12790 public DragShadowBuilder() { 12791 mView = new WeakReference<View>(null); 12792 } 12793 12794 /** 12795 * Returns the View object that had been passed to the 12796 * {@link #View.DragShadowBuilder(View)} 12797 * constructor. If that View parameter was {@code null} or if the 12798 * {@link #View.DragShadowBuilder()} 12799 * constructor was used to instantiate the builder object, this method will return 12800 * null. 12801 * 12802 * @return The View object associate with this builder object. 12803 */ 12804 @SuppressWarnings({"JavadocReference"}) 12805 final public View getView() { 12806 return mView.get(); 12807 } 12808 12809 /** 12810 * Provides the metrics for the shadow image. These include the dimensions of 12811 * the shadow image, and the point within that shadow that should 12812 * be centered under the touch location while dragging. 12813 * <p> 12814 * The default implementation sets the dimensions of the shadow to be the 12815 * same as the dimensions of the View itself and centers the shadow under 12816 * the touch point. 12817 * </p> 12818 * 12819 * @param shadowSize A {@link android.graphics.Point} containing the width and height 12820 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 12821 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 12822 * image. 12823 * 12824 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 12825 * shadow image that should be underneath the touch point during the drag and drop 12826 * operation. Your application must set {@link android.graphics.Point#x} to the 12827 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 12828 */ 12829 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 12830 final View view = mView.get(); 12831 if (view != null) { 12832 shadowSize.set(view.getWidth(), view.getHeight()); 12833 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 12834 } else { 12835 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 12836 } 12837 } 12838 12839 /** 12840 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 12841 * based on the dimensions it received from the 12842 * {@link #onProvideShadowMetrics(Point, Point)} callback. 12843 * 12844 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 12845 */ 12846 public void onDrawShadow(Canvas canvas) { 12847 final View view = mView.get(); 12848 if (view != null) { 12849 view.draw(canvas); 12850 } else { 12851 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 12852 } 12853 } 12854 } 12855 12856 /** 12857 * Starts a drag and drop operation. When your application calls this method, it passes a 12858 * {@link android.view.View.DragShadowBuilder} object to the system. The 12859 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 12860 * to get metrics for the drag shadow, and then calls the object's 12861 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 12862 * <p> 12863 * Once the system has the drag shadow, it begins the drag and drop operation by sending 12864 * drag events to all the View objects in your application that are currently visible. It does 12865 * this either by calling the View object's drag listener (an implementation of 12866 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 12867 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 12868 * Both are passed a {@link android.view.DragEvent} object that has a 12869 * {@link android.view.DragEvent#getAction()} value of 12870 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 12871 * </p> 12872 * <p> 12873 * Your application can invoke startDrag() on any attached View object. The View object does not 12874 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 12875 * be related to the View the user selected for dragging. 12876 * </p> 12877 * @param data A {@link android.content.ClipData} object pointing to the data to be 12878 * transferred by the drag and drop operation. 12879 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 12880 * drag shadow. 12881 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 12882 * drop operation. This Object is put into every DragEvent object sent by the system during the 12883 * current drag. 12884 * <p> 12885 * myLocalState is a lightweight mechanism for the sending information from the dragged View 12886 * to the target Views. For example, it can contain flags that differentiate between a 12887 * a copy operation and a move operation. 12888 * </p> 12889 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 12890 * so the parameter should be set to 0. 12891 * @return {@code true} if the method completes successfully, or 12892 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 12893 * do a drag, and so no drag operation is in progress. 12894 */ 12895 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 12896 Object myLocalState, int flags) { 12897 if (ViewDebug.DEBUG_DRAG) { 12898 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 12899 } 12900 boolean okay = false; 12901 12902 Point shadowSize = new Point(); 12903 Point shadowTouchPoint = new Point(); 12904 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 12905 12906 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 12907 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 12908 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 12909 } 12910 12911 if (ViewDebug.DEBUG_DRAG) { 12912 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 12913 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 12914 } 12915 Surface surface = new Surface(); 12916 try { 12917 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 12918 flags, shadowSize.x, shadowSize.y, surface); 12919 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 12920 + " surface=" + surface); 12921 if (token != null) { 12922 Canvas canvas = surface.lockCanvas(null); 12923 try { 12924 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 12925 shadowBuilder.onDrawShadow(canvas); 12926 } finally { 12927 surface.unlockCanvasAndPost(canvas); 12928 } 12929 12930 final ViewRootImpl root = getViewRootImpl(); 12931 12932 // Cache the local state object for delivery with DragEvents 12933 root.setLocalDragState(myLocalState); 12934 12935 // repurpose 'shadowSize' for the last touch point 12936 root.getLastTouchPoint(shadowSize); 12937 12938 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 12939 shadowSize.x, shadowSize.y, 12940 shadowTouchPoint.x, shadowTouchPoint.y, data); 12941 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 12942 } 12943 } catch (Exception e) { 12944 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 12945 surface.destroy(); 12946 } 12947 12948 return okay; 12949 } 12950 12951 /** 12952 * Handles drag events sent by the system following a call to 12953 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 12954 *<p> 12955 * When the system calls this method, it passes a 12956 * {@link android.view.DragEvent} object. A call to 12957 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 12958 * in DragEvent. The method uses these to determine what is happening in the drag and drop 12959 * operation. 12960 * @param event The {@link android.view.DragEvent} sent by the system. 12961 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 12962 * in DragEvent, indicating the type of drag event represented by this object. 12963 * @return {@code true} if the method was successful, otherwise {@code false}. 12964 * <p> 12965 * The method should return {@code true} in response to an action type of 12966 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 12967 * operation. 12968 * </p> 12969 * <p> 12970 * The method should also return {@code true} in response to an action type of 12971 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 12972 * {@code false} if it didn't. 12973 * </p> 12974 */ 12975 public boolean onDragEvent(DragEvent event) { 12976 return false; 12977 } 12978 12979 /** 12980 * Detects if this View is enabled and has a drag event listener. 12981 * If both are true, then it calls the drag event listener with the 12982 * {@link android.view.DragEvent} it received. If the drag event listener returns 12983 * {@code true}, then dispatchDragEvent() returns {@code true}. 12984 * <p> 12985 * For all other cases, the method calls the 12986 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 12987 * method and returns its result. 12988 * </p> 12989 * <p> 12990 * This ensures that a drag event is always consumed, even if the View does not have a drag 12991 * event listener. However, if the View has a listener and the listener returns true, then 12992 * onDragEvent() is not called. 12993 * </p> 12994 */ 12995 public boolean dispatchDragEvent(DragEvent event) { 12996 //noinspection SimplifiableIfStatement 12997 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 12998 && mOnDragListener.onDrag(this, event)) { 12999 return true; 13000 } 13001 return onDragEvent(event); 13002 } 13003 13004 boolean canAcceptDrag() { 13005 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 13006 } 13007 13008 /** 13009 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 13010 * it is ever exposed at all. 13011 * @hide 13012 */ 13013 public void onCloseSystemDialogs(String reason) { 13014 } 13015 13016 /** 13017 * Given a Drawable whose bounds have been set to draw into this view, 13018 * update a Region being computed for 13019 * {@link #gatherTransparentRegion(android.graphics.Region)} so 13020 * that any non-transparent parts of the Drawable are removed from the 13021 * given transparent region. 13022 * 13023 * @param dr The Drawable whose transparency is to be applied to the region. 13024 * @param region A Region holding the current transparency information, 13025 * where any parts of the region that are set are considered to be 13026 * transparent. On return, this region will be modified to have the 13027 * transparency information reduced by the corresponding parts of the 13028 * Drawable that are not transparent. 13029 * {@hide} 13030 */ 13031 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 13032 if (DBG) { 13033 Log.i("View", "Getting transparent region for: " + this); 13034 } 13035 final Region r = dr.getTransparentRegion(); 13036 final Rect db = dr.getBounds(); 13037 final AttachInfo attachInfo = mAttachInfo; 13038 if (r != null && attachInfo != null) { 13039 final int w = getRight()-getLeft(); 13040 final int h = getBottom()-getTop(); 13041 if (db.left > 0) { 13042 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 13043 r.op(0, 0, db.left, h, Region.Op.UNION); 13044 } 13045 if (db.right < w) { 13046 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 13047 r.op(db.right, 0, w, h, Region.Op.UNION); 13048 } 13049 if (db.top > 0) { 13050 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 13051 r.op(0, 0, w, db.top, Region.Op.UNION); 13052 } 13053 if (db.bottom < h) { 13054 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 13055 r.op(0, db.bottom, w, h, Region.Op.UNION); 13056 } 13057 final int[] location = attachInfo.mTransparentLocation; 13058 getLocationInWindow(location); 13059 r.translate(location[0], location[1]); 13060 region.op(r, Region.Op.INTERSECT); 13061 } else { 13062 region.op(db, Region.Op.DIFFERENCE); 13063 } 13064 } 13065 13066 private void checkForLongClick(int delayOffset) { 13067 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 13068 mHasPerformedLongPress = false; 13069 13070 if (mPendingCheckForLongPress == null) { 13071 mPendingCheckForLongPress = new CheckForLongPress(); 13072 } 13073 mPendingCheckForLongPress.rememberWindowAttachCount(); 13074 postDelayed(mPendingCheckForLongPress, 13075 ViewConfiguration.getLongPressTimeout() - delayOffset); 13076 } 13077 } 13078 13079 /** 13080 * Inflate a view from an XML resource. This convenience method wraps the {@link 13081 * LayoutInflater} class, which provides a full range of options for view inflation. 13082 * 13083 * @param context The Context object for your activity or application. 13084 * @param resource The resource ID to inflate 13085 * @param root A view group that will be the parent. Used to properly inflate the 13086 * layout_* parameters. 13087 * @see LayoutInflater 13088 */ 13089 public static View inflate(Context context, int resource, ViewGroup root) { 13090 LayoutInflater factory = LayoutInflater.from(context); 13091 return factory.inflate(resource, root); 13092 } 13093 13094 /** 13095 * Scroll the view with standard behavior for scrolling beyond the normal 13096 * content boundaries. Views that call this method should override 13097 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 13098 * results of an over-scroll operation. 13099 * 13100 * Views can use this method to handle any touch or fling-based scrolling. 13101 * 13102 * @param deltaX Change in X in pixels 13103 * @param deltaY Change in Y in pixels 13104 * @param scrollX Current X scroll value in pixels before applying deltaX 13105 * @param scrollY Current Y scroll value in pixels before applying deltaY 13106 * @param scrollRangeX Maximum content scroll range along the X axis 13107 * @param scrollRangeY Maximum content scroll range along the Y axis 13108 * @param maxOverScrollX Number of pixels to overscroll by in either direction 13109 * along the X axis. 13110 * @param maxOverScrollY Number of pixels to overscroll by in either direction 13111 * along the Y axis. 13112 * @param isTouchEvent true if this scroll operation is the result of a touch event. 13113 * @return true if scrolling was clamped to an over-scroll boundary along either 13114 * axis, false otherwise. 13115 */ 13116 @SuppressWarnings({"UnusedParameters"}) 13117 protected boolean overScrollBy(int deltaX, int deltaY, 13118 int scrollX, int scrollY, 13119 int scrollRangeX, int scrollRangeY, 13120 int maxOverScrollX, int maxOverScrollY, 13121 boolean isTouchEvent) { 13122 final int overScrollMode = mOverScrollMode; 13123 final boolean canScrollHorizontal = 13124 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 13125 final boolean canScrollVertical = 13126 computeVerticalScrollRange() > computeVerticalScrollExtent(); 13127 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 13128 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 13129 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 13130 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 13131 13132 int newScrollX = scrollX + deltaX; 13133 if (!overScrollHorizontal) { 13134 maxOverScrollX = 0; 13135 } 13136 13137 int newScrollY = scrollY + deltaY; 13138 if (!overScrollVertical) { 13139 maxOverScrollY = 0; 13140 } 13141 13142 // Clamp values if at the limits and record 13143 final int left = -maxOverScrollX; 13144 final int right = maxOverScrollX + scrollRangeX; 13145 final int top = -maxOverScrollY; 13146 final int bottom = maxOverScrollY + scrollRangeY; 13147 13148 boolean clampedX = false; 13149 if (newScrollX > right) { 13150 newScrollX = right; 13151 clampedX = true; 13152 } else if (newScrollX < left) { 13153 newScrollX = left; 13154 clampedX = true; 13155 } 13156 13157 boolean clampedY = false; 13158 if (newScrollY > bottom) { 13159 newScrollY = bottom; 13160 clampedY = true; 13161 } else if (newScrollY < top) { 13162 newScrollY = top; 13163 clampedY = true; 13164 } 13165 13166 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 13167 13168 return clampedX || clampedY; 13169 } 13170 13171 /** 13172 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 13173 * respond to the results of an over-scroll operation. 13174 * 13175 * @param scrollX New X scroll value in pixels 13176 * @param scrollY New Y scroll value in pixels 13177 * @param clampedX True if scrollX was clamped to an over-scroll boundary 13178 * @param clampedY True if scrollY was clamped to an over-scroll boundary 13179 */ 13180 protected void onOverScrolled(int scrollX, int scrollY, 13181 boolean clampedX, boolean clampedY) { 13182 // Intentionally empty. 13183 } 13184 13185 /** 13186 * Returns the over-scroll mode for this view. The result will be 13187 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13188 * (allow over-scrolling only if the view content is larger than the container), 13189 * or {@link #OVER_SCROLL_NEVER}. 13190 * 13191 * @return This view's over-scroll mode. 13192 */ 13193 public int getOverScrollMode() { 13194 return mOverScrollMode; 13195 } 13196 13197 /** 13198 * Set the over-scroll mode for this view. Valid over-scroll modes are 13199 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13200 * (allow over-scrolling only if the view content is larger than the container), 13201 * or {@link #OVER_SCROLL_NEVER}. 13202 * 13203 * Setting the over-scroll mode of a view will have an effect only if the 13204 * view is capable of scrolling. 13205 * 13206 * @param overScrollMode The new over-scroll mode for this view. 13207 */ 13208 public void setOverScrollMode(int overScrollMode) { 13209 if (overScrollMode != OVER_SCROLL_ALWAYS && 13210 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 13211 overScrollMode != OVER_SCROLL_NEVER) { 13212 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 13213 } 13214 mOverScrollMode = overScrollMode; 13215 } 13216 13217 /** 13218 * Gets a scale factor that determines the distance the view should scroll 13219 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 13220 * @return The vertical scroll scale factor. 13221 * @hide 13222 */ 13223 protected float getVerticalScrollFactor() { 13224 if (mVerticalScrollFactor == 0) { 13225 TypedValue outValue = new TypedValue(); 13226 if (!mContext.getTheme().resolveAttribute( 13227 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 13228 throw new IllegalStateException( 13229 "Expected theme to define listPreferredItemHeight."); 13230 } 13231 mVerticalScrollFactor = outValue.getDimension( 13232 mContext.getResources().getDisplayMetrics()); 13233 } 13234 return mVerticalScrollFactor; 13235 } 13236 13237 /** 13238 * Gets a scale factor that determines the distance the view should scroll 13239 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 13240 * @return The horizontal scroll scale factor. 13241 * @hide 13242 */ 13243 protected float getHorizontalScrollFactor() { 13244 // TODO: Should use something else. 13245 return getVerticalScrollFactor(); 13246 } 13247 13248 /** 13249 * Return the value specifying the text direction or policy that was set with 13250 * {@link #setTextDirection(int)}. 13251 * 13252 * @return the defined text direction. It can be one of: 13253 * 13254 * {@link #TEXT_DIRECTION_INHERIT}, 13255 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13256 * {@link #TEXT_DIRECTION_ANY_RTL}, 13257 * {@link #TEXT_DIRECTION_LTR}, 13258 * {@link #TEXT_DIRECTION_RTL}, 13259 * 13260 * @hide 13261 */ 13262 public int getTextDirection() { 13263 return mTextDirection; 13264 } 13265 13266 /** 13267 * Set the text direction. 13268 * 13269 * @param textDirection the direction to set. Should be one of: 13270 * 13271 * {@link #TEXT_DIRECTION_INHERIT}, 13272 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13273 * {@link #TEXT_DIRECTION_ANY_RTL}, 13274 * {@link #TEXT_DIRECTION_LTR}, 13275 * {@link #TEXT_DIRECTION_RTL}, 13276 * 13277 * @hide 13278 */ 13279 public void setTextDirection(int textDirection) { 13280 if (textDirection != mTextDirection) { 13281 mTextDirection = textDirection; 13282 resetResolvedTextDirection(); 13283 requestLayout(); 13284 } 13285 } 13286 13287 /** 13288 * Return the resolved text direction. 13289 * 13290 * @return the resolved text direction. Return one of: 13291 * 13292 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13293 * {@link #TEXT_DIRECTION_ANY_RTL}, 13294 * {@link #TEXT_DIRECTION_LTR}, 13295 * {@link #TEXT_DIRECTION_RTL}, 13296 * 13297 * @hide 13298 */ 13299 public int getResolvedTextDirection() { 13300 if (mResolvedTextDirection == TEXT_DIRECTION_INHERIT) { 13301 resolveTextDirection(); 13302 } 13303 return mResolvedTextDirection; 13304 } 13305 13306 /** 13307 * Resolve the text direction. 13308 * 13309 * @hide 13310 */ 13311 protected void resolveTextDirection() { 13312 if (mTextDirection != TEXT_DIRECTION_INHERIT) { 13313 mResolvedTextDirection = mTextDirection; 13314 return; 13315 } 13316 if (mParent != null && mParent instanceof ViewGroup) { 13317 mResolvedTextDirection = ((ViewGroup) mParent).getResolvedTextDirection(); 13318 return; 13319 } 13320 mResolvedTextDirection = TEXT_DIRECTION_FIRST_STRONG; 13321 } 13322 13323 /** 13324 * Reset resolved text direction. Will be resolved during a call to getResolvedTextDirection(). 13325 * 13326 * @hide 13327 */ 13328 protected void resetResolvedTextDirection() { 13329 mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 13330 } 13331 13332 // 13333 // Properties 13334 // 13335 /** 13336 * A Property wrapper around the <code>alpha</code> functionality handled by the 13337 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 13338 */ 13339 public static Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 13340 @Override 13341 public void setValue(View object, float value) { 13342 object.setAlpha(value); 13343 } 13344 13345 @Override 13346 public Float get(View object) { 13347 return object.getAlpha(); 13348 } 13349 }; 13350 13351 /** 13352 * A Property wrapper around the <code>translationX</code> functionality handled by the 13353 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 13354 */ 13355 public static Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 13356 @Override 13357 public void setValue(View object, float value) { 13358 object.setTranslationX(value); 13359 } 13360 13361 @Override 13362 public Float get(View object) { 13363 return object.getTranslationX(); 13364 } 13365 }; 13366 13367 /** 13368 * A Property wrapper around the <code>translationY</code> functionality handled by the 13369 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 13370 */ 13371 public static Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 13372 @Override 13373 public void setValue(View object, float value) { 13374 object.setTranslationY(value); 13375 } 13376 13377 @Override 13378 public Float get(View object) { 13379 return object.getTranslationY(); 13380 } 13381 }; 13382 13383 /** 13384 * A Property wrapper around the <code>x</code> functionality handled by the 13385 * {@link View#setX(float)} and {@link View#getX()} methods. 13386 */ 13387 public static Property<View, Float> X = new FloatProperty<View>("x") { 13388 @Override 13389 public void setValue(View object, float value) { 13390 object.setX(value); 13391 } 13392 13393 @Override 13394 public Float get(View object) { 13395 return object.getX(); 13396 } 13397 }; 13398 13399 /** 13400 * A Property wrapper around the <code>y</code> functionality handled by the 13401 * {@link View#setY(float)} and {@link View#getY()} methods. 13402 */ 13403 public static Property<View, Float> Y = new FloatProperty<View>("y") { 13404 @Override 13405 public void setValue(View object, float value) { 13406 object.setY(value); 13407 } 13408 13409 @Override 13410 public Float get(View object) { 13411 return object.getY(); 13412 } 13413 }; 13414 13415 /** 13416 * A Property wrapper around the <code>rotation</code> functionality handled by the 13417 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 13418 */ 13419 public static Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 13420 @Override 13421 public void setValue(View object, float value) { 13422 object.setRotation(value); 13423 } 13424 13425 @Override 13426 public Float get(View object) { 13427 return object.getRotation(); 13428 } 13429 }; 13430 13431 /** 13432 * A Property wrapper around the <code>rotationX</code> functionality handled by the 13433 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 13434 */ 13435 public static Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 13436 @Override 13437 public void setValue(View object, float value) { 13438 object.setRotationX(value); 13439 } 13440 13441 @Override 13442 public Float get(View object) { 13443 return object.getRotationX(); 13444 } 13445 }; 13446 13447 /** 13448 * A Property wrapper around the <code>rotationY</code> functionality handled by the 13449 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 13450 */ 13451 public static Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 13452 @Override 13453 public void setValue(View object, float value) { 13454 object.setRotationY(value); 13455 } 13456 13457 @Override 13458 public Float get(View object) { 13459 return object.getRotationY(); 13460 } 13461 }; 13462 13463 /** 13464 * A Property wrapper around the <code>scaleX</code> functionality handled by the 13465 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 13466 */ 13467 public static Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 13468 @Override 13469 public void setValue(View object, float value) { 13470 object.setScaleX(value); 13471 } 13472 13473 @Override 13474 public Float get(View object) { 13475 return object.getScaleX(); 13476 } 13477 }; 13478 13479 /** 13480 * A Property wrapper around the <code>scaleY</code> functionality handled by the 13481 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 13482 */ 13483 public static Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 13484 @Override 13485 public void setValue(View object, float value) { 13486 object.setScaleY(value); 13487 } 13488 13489 @Override 13490 public Float get(View object) { 13491 return object.getScaleY(); 13492 } 13493 }; 13494 13495 /** 13496 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 13497 * Each MeasureSpec represents a requirement for either the width or the height. 13498 * A MeasureSpec is comprised of a size and a mode. There are three possible 13499 * modes: 13500 * <dl> 13501 * <dt>UNSPECIFIED</dt> 13502 * <dd> 13503 * The parent has not imposed any constraint on the child. It can be whatever size 13504 * it wants. 13505 * </dd> 13506 * 13507 * <dt>EXACTLY</dt> 13508 * <dd> 13509 * The parent has determined an exact size for the child. The child is going to be 13510 * given those bounds regardless of how big it wants to be. 13511 * </dd> 13512 * 13513 * <dt>AT_MOST</dt> 13514 * <dd> 13515 * The child can be as large as it wants up to the specified size. 13516 * </dd> 13517 * </dl> 13518 * 13519 * MeasureSpecs are implemented as ints to reduce object allocation. This class 13520 * is provided to pack and unpack the <size, mode> tuple into the int. 13521 */ 13522 public static class MeasureSpec { 13523 private static final int MODE_SHIFT = 30; 13524 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 13525 13526 /** 13527 * Measure specification mode: The parent has not imposed any constraint 13528 * on the child. It can be whatever size it wants. 13529 */ 13530 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 13531 13532 /** 13533 * Measure specification mode: The parent has determined an exact size 13534 * for the child. The child is going to be given those bounds regardless 13535 * of how big it wants to be. 13536 */ 13537 public static final int EXACTLY = 1 << MODE_SHIFT; 13538 13539 /** 13540 * Measure specification mode: The child can be as large as it wants up 13541 * to the specified size. 13542 */ 13543 public static final int AT_MOST = 2 << MODE_SHIFT; 13544 13545 /** 13546 * Creates a measure specification based on the supplied size and mode. 13547 * 13548 * The mode must always be one of the following: 13549 * <ul> 13550 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 13551 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 13552 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 13553 * </ul> 13554 * 13555 * @param size the size of the measure specification 13556 * @param mode the mode of the measure specification 13557 * @return the measure specification based on size and mode 13558 */ 13559 public static int makeMeasureSpec(int size, int mode) { 13560 return size + mode; 13561 } 13562 13563 /** 13564 * Extracts the mode from the supplied measure specification. 13565 * 13566 * @param measureSpec the measure specification to extract the mode from 13567 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 13568 * {@link android.view.View.MeasureSpec#AT_MOST} or 13569 * {@link android.view.View.MeasureSpec#EXACTLY} 13570 */ 13571 public static int getMode(int measureSpec) { 13572 return (measureSpec & MODE_MASK); 13573 } 13574 13575 /** 13576 * Extracts the size from the supplied measure specification. 13577 * 13578 * @param measureSpec the measure specification to extract the size from 13579 * @return the size in pixels defined in the supplied measure specification 13580 */ 13581 public static int getSize(int measureSpec) { 13582 return (measureSpec & ~MODE_MASK); 13583 } 13584 13585 /** 13586 * Returns a String representation of the specified measure 13587 * specification. 13588 * 13589 * @param measureSpec the measure specification to convert to a String 13590 * @return a String with the following format: "MeasureSpec: MODE SIZE" 13591 */ 13592 public static String toString(int measureSpec) { 13593 int mode = getMode(measureSpec); 13594 int size = getSize(measureSpec); 13595 13596 StringBuilder sb = new StringBuilder("MeasureSpec: "); 13597 13598 if (mode == UNSPECIFIED) 13599 sb.append("UNSPECIFIED "); 13600 else if (mode == EXACTLY) 13601 sb.append("EXACTLY "); 13602 else if (mode == AT_MOST) 13603 sb.append("AT_MOST "); 13604 else 13605 sb.append(mode).append(" "); 13606 13607 sb.append(size); 13608 return sb.toString(); 13609 } 13610 } 13611 13612 class CheckForLongPress implements Runnable { 13613 13614 private int mOriginalWindowAttachCount; 13615 13616 public void run() { 13617 if (isPressed() && (mParent != null) 13618 && mOriginalWindowAttachCount == mWindowAttachCount) { 13619 if (performLongClick()) { 13620 mHasPerformedLongPress = true; 13621 } 13622 } 13623 } 13624 13625 public void rememberWindowAttachCount() { 13626 mOriginalWindowAttachCount = mWindowAttachCount; 13627 } 13628 } 13629 13630 private final class CheckForTap implements Runnable { 13631 public void run() { 13632 mPrivateFlags &= ~PREPRESSED; 13633 mPrivateFlags |= PRESSED; 13634 refreshDrawableState(); 13635 checkForLongClick(ViewConfiguration.getTapTimeout()); 13636 } 13637 } 13638 13639 private final class PerformClick implements Runnable { 13640 public void run() { 13641 performClick(); 13642 } 13643 } 13644 13645 /** @hide */ 13646 public void hackTurnOffWindowResizeAnim(boolean off) { 13647 mAttachInfo.mTurnOffWindowResizeAnim = off; 13648 } 13649 13650 /** 13651 * This method returns a ViewPropertyAnimator object, which can be used to animate 13652 * specific properties on this View. 13653 * 13654 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 13655 */ 13656 public ViewPropertyAnimator animate() { 13657 if (mAnimator == null) { 13658 mAnimator = new ViewPropertyAnimator(this); 13659 } 13660 return mAnimator; 13661 } 13662 13663 /** 13664 * Interface definition for a callback to be invoked when a key event is 13665 * dispatched to this view. The callback will be invoked before the key 13666 * event is given to the view. 13667 */ 13668 public interface OnKeyListener { 13669 /** 13670 * Called when a key is dispatched to a view. This allows listeners to 13671 * get a chance to respond before the target view. 13672 * 13673 * @param v The view the key has been dispatched to. 13674 * @param keyCode The code for the physical key that was pressed 13675 * @param event The KeyEvent object containing full information about 13676 * the event. 13677 * @return True if the listener has consumed the event, false otherwise. 13678 */ 13679 boolean onKey(View v, int keyCode, KeyEvent event); 13680 } 13681 13682 /** 13683 * Interface definition for a callback to be invoked when a touch event is 13684 * dispatched to this view. The callback will be invoked before the touch 13685 * event is given to the view. 13686 */ 13687 public interface OnTouchListener { 13688 /** 13689 * Called when a touch event is dispatched to a view. This allows listeners to 13690 * get a chance to respond before the target view. 13691 * 13692 * @param v The view the touch event has been dispatched to. 13693 * @param event The MotionEvent object containing full information about 13694 * the event. 13695 * @return True if the listener has consumed the event, false otherwise. 13696 */ 13697 boolean onTouch(View v, MotionEvent event); 13698 } 13699 13700 /** 13701 * Interface definition for a callback to be invoked when a hover event is 13702 * dispatched to this view. The callback will be invoked before the hover 13703 * event is given to the view. 13704 */ 13705 public interface OnHoverListener { 13706 /** 13707 * Called when a hover event is dispatched to a view. This allows listeners to 13708 * get a chance to respond before the target view. 13709 * 13710 * @param v The view the hover event has been dispatched to. 13711 * @param event The MotionEvent object containing full information about 13712 * the event. 13713 * @return True if the listener has consumed the event, false otherwise. 13714 */ 13715 boolean onHover(View v, MotionEvent event); 13716 } 13717 13718 /** 13719 * Interface definition for a callback to be invoked when a generic motion event is 13720 * dispatched to this view. The callback will be invoked before the generic motion 13721 * event is given to the view. 13722 */ 13723 public interface OnGenericMotionListener { 13724 /** 13725 * Called when a generic motion event is dispatched to a view. This allows listeners to 13726 * get a chance to respond before the target view. 13727 * 13728 * @param v The view the generic motion event has been dispatched to. 13729 * @param event The MotionEvent object containing full information about 13730 * the event. 13731 * @return True if the listener has consumed the event, false otherwise. 13732 */ 13733 boolean onGenericMotion(View v, MotionEvent event); 13734 } 13735 13736 /** 13737 * Interface definition for a callback to be invoked when a view has been clicked and held. 13738 */ 13739 public interface OnLongClickListener { 13740 /** 13741 * Called when a view has been clicked and held. 13742 * 13743 * @param v The view that was clicked and held. 13744 * 13745 * @return true if the callback consumed the long click, false otherwise. 13746 */ 13747 boolean onLongClick(View v); 13748 } 13749 13750 /** 13751 * Interface definition for a callback to be invoked when a drag is being dispatched 13752 * to this view. The callback will be invoked before the hosting view's own 13753 * onDrag(event) method. If the listener wants to fall back to the hosting view's 13754 * onDrag(event) behavior, it should return 'false' from this callback. 13755 */ 13756 public interface OnDragListener { 13757 /** 13758 * Called when a drag event is dispatched to a view. This allows listeners 13759 * to get a chance to override base View behavior. 13760 * 13761 * @param v The View that received the drag event. 13762 * @param event The {@link android.view.DragEvent} object for the drag event. 13763 * @return {@code true} if the drag event was handled successfully, or {@code false} 13764 * if the drag event was not handled. Note that {@code false} will trigger the View 13765 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 13766 */ 13767 boolean onDrag(View v, DragEvent event); 13768 } 13769 13770 /** 13771 * Interface definition for a callback to be invoked when the focus state of 13772 * a view changed. 13773 */ 13774 public interface OnFocusChangeListener { 13775 /** 13776 * Called when the focus state of a view has changed. 13777 * 13778 * @param v The view whose state has changed. 13779 * @param hasFocus The new focus state of v. 13780 */ 13781 void onFocusChange(View v, boolean hasFocus); 13782 } 13783 13784 /** 13785 * Interface definition for a callback to be invoked when a view is clicked. 13786 */ 13787 public interface OnClickListener { 13788 /** 13789 * Called when a view has been clicked. 13790 * 13791 * @param v The view that was clicked. 13792 */ 13793 void onClick(View v); 13794 } 13795 13796 /** 13797 * Interface definition for a callback to be invoked when the context menu 13798 * for this view is being built. 13799 */ 13800 public interface OnCreateContextMenuListener { 13801 /** 13802 * Called when the context menu for this view is being built. It is not 13803 * safe to hold onto the menu after this method returns. 13804 * 13805 * @param menu The context menu that is being built 13806 * @param v The view for which the context menu is being built 13807 * @param menuInfo Extra information about the item for which the 13808 * context menu should be shown. This information will vary 13809 * depending on the class of v. 13810 */ 13811 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 13812 } 13813 13814 /** 13815 * Interface definition for a callback to be invoked when the status bar changes 13816 * visibility. 13817 * 13818 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 13819 */ 13820 public interface OnSystemUiVisibilityChangeListener { 13821 /** 13822 * Called when the status bar changes visibility because of a call to 13823 * {@link View#setSystemUiVisibility(int)}. 13824 * 13825 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13826 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13827 */ 13828 public void onSystemUiVisibilityChange(int visibility); 13829 } 13830 13831 /** 13832 * Interface definition for a callback to be invoked when this view is attached 13833 * or detached from its window. 13834 */ 13835 public interface OnAttachStateChangeListener { 13836 /** 13837 * Called when the view is attached to a window. 13838 * @param v The view that was attached 13839 */ 13840 public void onViewAttachedToWindow(View v); 13841 /** 13842 * Called when the view is detached from a window. 13843 * @param v The view that was detached 13844 */ 13845 public void onViewDetachedFromWindow(View v); 13846 } 13847 13848 private final class UnsetPressedState implements Runnable { 13849 public void run() { 13850 setPressed(false); 13851 } 13852 } 13853 13854 /** 13855 * Base class for derived classes that want to save and restore their own 13856 * state in {@link android.view.View#onSaveInstanceState()}. 13857 */ 13858 public static class BaseSavedState extends AbsSavedState { 13859 /** 13860 * Constructor used when reading from a parcel. Reads the state of the superclass. 13861 * 13862 * @param source 13863 */ 13864 public BaseSavedState(Parcel source) { 13865 super(source); 13866 } 13867 13868 /** 13869 * Constructor called by derived classes when creating their SavedState objects 13870 * 13871 * @param superState The state of the superclass of this view 13872 */ 13873 public BaseSavedState(Parcelable superState) { 13874 super(superState); 13875 } 13876 13877 public static final Parcelable.Creator<BaseSavedState> CREATOR = 13878 new Parcelable.Creator<BaseSavedState>() { 13879 public BaseSavedState createFromParcel(Parcel in) { 13880 return new BaseSavedState(in); 13881 } 13882 13883 public BaseSavedState[] newArray(int size) { 13884 return new BaseSavedState[size]; 13885 } 13886 }; 13887 } 13888 13889 /** 13890 * A set of information given to a view when it is attached to its parent 13891 * window. 13892 */ 13893 static class AttachInfo { 13894 interface Callbacks { 13895 void playSoundEffect(int effectId); 13896 boolean performHapticFeedback(int effectId, boolean always); 13897 } 13898 13899 /** 13900 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 13901 * to a Handler. This class contains the target (View) to invalidate and 13902 * the coordinates of the dirty rectangle. 13903 * 13904 * For performance purposes, this class also implements a pool of up to 13905 * POOL_LIMIT objects that get reused. This reduces memory allocations 13906 * whenever possible. 13907 */ 13908 static class InvalidateInfo implements Poolable<InvalidateInfo> { 13909 private static final int POOL_LIMIT = 10; 13910 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 13911 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 13912 public InvalidateInfo newInstance() { 13913 return new InvalidateInfo(); 13914 } 13915 13916 public void onAcquired(InvalidateInfo element) { 13917 } 13918 13919 public void onReleased(InvalidateInfo element) { 13920 element.target = null; 13921 } 13922 }, POOL_LIMIT) 13923 ); 13924 13925 private InvalidateInfo mNext; 13926 private boolean mIsPooled; 13927 13928 View target; 13929 13930 int left; 13931 int top; 13932 int right; 13933 int bottom; 13934 13935 public void setNextPoolable(InvalidateInfo element) { 13936 mNext = element; 13937 } 13938 13939 public InvalidateInfo getNextPoolable() { 13940 return mNext; 13941 } 13942 13943 static InvalidateInfo acquire() { 13944 return sPool.acquire(); 13945 } 13946 13947 void release() { 13948 sPool.release(this); 13949 } 13950 13951 public boolean isPooled() { 13952 return mIsPooled; 13953 } 13954 13955 public void setPooled(boolean isPooled) { 13956 mIsPooled = isPooled; 13957 } 13958 } 13959 13960 final IWindowSession mSession; 13961 13962 final IWindow mWindow; 13963 13964 final IBinder mWindowToken; 13965 13966 final Callbacks mRootCallbacks; 13967 13968 HardwareCanvas mHardwareCanvas; 13969 13970 /** 13971 * The top view of the hierarchy. 13972 */ 13973 View mRootView; 13974 13975 IBinder mPanelParentWindowToken; 13976 Surface mSurface; 13977 13978 boolean mHardwareAccelerated; 13979 boolean mHardwareAccelerationRequested; 13980 HardwareRenderer mHardwareRenderer; 13981 13982 /** 13983 * Scale factor used by the compatibility mode 13984 */ 13985 float mApplicationScale; 13986 13987 /** 13988 * Indicates whether the application is in compatibility mode 13989 */ 13990 boolean mScalingRequired; 13991 13992 /** 13993 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 13994 */ 13995 boolean mTurnOffWindowResizeAnim; 13996 13997 /** 13998 * Left position of this view's window 13999 */ 14000 int mWindowLeft; 14001 14002 /** 14003 * Top position of this view's window 14004 */ 14005 int mWindowTop; 14006 14007 /** 14008 * Indicates whether views need to use 32-bit drawing caches 14009 */ 14010 boolean mUse32BitDrawingCache; 14011 14012 /** 14013 * For windows that are full-screen but using insets to layout inside 14014 * of the screen decorations, these are the current insets for the 14015 * content of the window. 14016 */ 14017 final Rect mContentInsets = new Rect(); 14018 14019 /** 14020 * For windows that are full-screen but using insets to layout inside 14021 * of the screen decorations, these are the current insets for the 14022 * actual visible parts of the window. 14023 */ 14024 final Rect mVisibleInsets = new Rect(); 14025 14026 /** 14027 * The internal insets given by this window. This value is 14028 * supplied by the client (through 14029 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 14030 * be given to the window manager when changed to be used in laying 14031 * out windows behind it. 14032 */ 14033 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 14034 = new ViewTreeObserver.InternalInsetsInfo(); 14035 14036 /** 14037 * All views in the window's hierarchy that serve as scroll containers, 14038 * used to determine if the window can be resized or must be panned 14039 * to adjust for a soft input area. 14040 */ 14041 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 14042 14043 final KeyEvent.DispatcherState mKeyDispatchState 14044 = new KeyEvent.DispatcherState(); 14045 14046 /** 14047 * Indicates whether the view's window currently has the focus. 14048 */ 14049 boolean mHasWindowFocus; 14050 14051 /** 14052 * The current visibility of the window. 14053 */ 14054 int mWindowVisibility; 14055 14056 /** 14057 * Indicates the time at which drawing started to occur. 14058 */ 14059 long mDrawingTime; 14060 14061 /** 14062 * Indicates whether or not ignoring the DIRTY_MASK flags. 14063 */ 14064 boolean mIgnoreDirtyState; 14065 14066 /** 14067 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 14068 * to avoid clearing that flag prematurely. 14069 */ 14070 boolean mSetIgnoreDirtyState = false; 14071 14072 /** 14073 * Indicates whether the view's window is currently in touch mode. 14074 */ 14075 boolean mInTouchMode; 14076 14077 /** 14078 * Indicates that ViewAncestor should trigger a global layout change 14079 * the next time it performs a traversal 14080 */ 14081 boolean mRecomputeGlobalAttributes; 14082 14083 /** 14084 * Set during a traveral if any views want to keep the screen on. 14085 */ 14086 boolean mKeepScreenOn; 14087 14088 /** 14089 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 14090 */ 14091 int mSystemUiVisibility; 14092 14093 /** 14094 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 14095 * attached. 14096 */ 14097 boolean mHasSystemUiListeners; 14098 14099 /** 14100 * Set if the visibility of any views has changed. 14101 */ 14102 boolean mViewVisibilityChanged; 14103 14104 /** 14105 * Set to true if a view has been scrolled. 14106 */ 14107 boolean mViewScrollChanged; 14108 14109 /** 14110 * Global to the view hierarchy used as a temporary for dealing with 14111 * x/y points in the transparent region computations. 14112 */ 14113 final int[] mTransparentLocation = new int[2]; 14114 14115 /** 14116 * Global to the view hierarchy used as a temporary for dealing with 14117 * x/y points in the ViewGroup.invalidateChild implementation. 14118 */ 14119 final int[] mInvalidateChildLocation = new int[2]; 14120 14121 14122 /** 14123 * Global to the view hierarchy used as a temporary for dealing with 14124 * x/y location when view is transformed. 14125 */ 14126 final float[] mTmpTransformLocation = new float[2]; 14127 14128 /** 14129 * The view tree observer used to dispatch global events like 14130 * layout, pre-draw, touch mode change, etc. 14131 */ 14132 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 14133 14134 /** 14135 * A Canvas used by the view hierarchy to perform bitmap caching. 14136 */ 14137 Canvas mCanvas; 14138 14139 /** 14140 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 14141 * handler can be used to pump events in the UI events queue. 14142 */ 14143 final Handler mHandler; 14144 14145 /** 14146 * Identifier for messages requesting the view to be invalidated. 14147 * Such messages should be sent to {@link #mHandler}. 14148 */ 14149 static final int INVALIDATE_MSG = 0x1; 14150 14151 /** 14152 * Identifier for messages requesting the view to invalidate a region. 14153 * Such messages should be sent to {@link #mHandler}. 14154 */ 14155 static final int INVALIDATE_RECT_MSG = 0x2; 14156 14157 /** 14158 * Temporary for use in computing invalidate rectangles while 14159 * calling up the hierarchy. 14160 */ 14161 final Rect mTmpInvalRect = new Rect(); 14162 14163 /** 14164 * Temporary for use in computing hit areas with transformed views 14165 */ 14166 final RectF mTmpTransformRect = new RectF(); 14167 14168 /** 14169 * Temporary list for use in collecting focusable descendents of a view. 14170 */ 14171 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 14172 14173 /** 14174 * The id of the window for accessibility purposes. 14175 */ 14176 int mAccessibilityWindowId = View.NO_ID; 14177 14178 /** 14179 * Creates a new set of attachment information with the specified 14180 * events handler and thread. 14181 * 14182 * @param handler the events handler the view must use 14183 */ 14184 AttachInfo(IWindowSession session, IWindow window, 14185 Handler handler, Callbacks effectPlayer) { 14186 mSession = session; 14187 mWindow = window; 14188 mWindowToken = window.asBinder(); 14189 mHandler = handler; 14190 mRootCallbacks = effectPlayer; 14191 } 14192 } 14193 14194 /** 14195 * <p>ScrollabilityCache holds various fields used by a View when scrolling 14196 * is supported. This avoids keeping too many unused fields in most 14197 * instances of View.</p> 14198 */ 14199 private static class ScrollabilityCache implements Runnable { 14200 14201 /** 14202 * Scrollbars are not visible 14203 */ 14204 public static final int OFF = 0; 14205 14206 /** 14207 * Scrollbars are visible 14208 */ 14209 public static final int ON = 1; 14210 14211 /** 14212 * Scrollbars are fading away 14213 */ 14214 public static final int FADING = 2; 14215 14216 public boolean fadeScrollBars; 14217 14218 public int fadingEdgeLength; 14219 public int scrollBarDefaultDelayBeforeFade; 14220 public int scrollBarFadeDuration; 14221 14222 public int scrollBarSize; 14223 public ScrollBarDrawable scrollBar; 14224 public float[] interpolatorValues; 14225 public View host; 14226 14227 public final Paint paint; 14228 public final Matrix matrix; 14229 public Shader shader; 14230 14231 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 14232 14233 private static final float[] OPAQUE = { 255 }; 14234 private static final float[] TRANSPARENT = { 0.0f }; 14235 14236 /** 14237 * When fading should start. This time moves into the future every time 14238 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 14239 */ 14240 public long fadeStartTime; 14241 14242 14243 /** 14244 * The current state of the scrollbars: ON, OFF, or FADING 14245 */ 14246 public int state = OFF; 14247 14248 private int mLastColor; 14249 14250 public ScrollabilityCache(ViewConfiguration configuration, View host) { 14251 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 14252 scrollBarSize = configuration.getScaledScrollBarSize(); 14253 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 14254 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 14255 14256 paint = new Paint(); 14257 matrix = new Matrix(); 14258 // use use a height of 1, and then wack the matrix each time we 14259 // actually use it. 14260 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 14261 14262 paint.setShader(shader); 14263 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 14264 this.host = host; 14265 } 14266 14267 public void setFadeColor(int color) { 14268 if (color != 0 && color != mLastColor) { 14269 mLastColor = color; 14270 color |= 0xFF000000; 14271 14272 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 14273 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 14274 14275 paint.setShader(shader); 14276 // Restore the default transfer mode (src_over) 14277 paint.setXfermode(null); 14278 } 14279 } 14280 14281 public void run() { 14282 long now = AnimationUtils.currentAnimationTimeMillis(); 14283 if (now >= fadeStartTime) { 14284 14285 // the animation fades the scrollbars out by changing 14286 // the opacity (alpha) from fully opaque to fully 14287 // transparent 14288 int nextFrame = (int) now; 14289 int framesCount = 0; 14290 14291 Interpolator interpolator = scrollBarInterpolator; 14292 14293 // Start opaque 14294 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 14295 14296 // End transparent 14297 nextFrame += scrollBarFadeDuration; 14298 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 14299 14300 state = FADING; 14301 14302 // Kick off the fade animation 14303 host.invalidate(true); 14304 } 14305 } 14306 } 14307 14308 /** 14309 * Resuable callback for sending 14310 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 14311 */ 14312 private class SendViewScrolledAccessibilityEvent implements Runnable { 14313 public volatile boolean mIsPending; 14314 14315 public void run() { 14316 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 14317 mIsPending = false; 14318 } 14319 } 14320} 14321