View.java revision c46f7ffa9079f3ae8a5204e7519ed7a1250116d0
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 com.android.internal.R; 20import com.android.internal.util.Predicate; 21import com.android.internal.view.menu.MenuBuilder; 22 23import android.content.ClipData; 24import android.content.Context; 25import android.content.res.Configuration; 26import android.content.res.Resources; 27import android.content.res.TypedArray; 28import android.graphics.Bitmap; 29import android.graphics.Camera; 30import android.graphics.Canvas; 31import android.graphics.Interpolator; 32import android.graphics.LinearGradient; 33import android.graphics.Matrix; 34import android.graphics.Paint; 35import android.graphics.PixelFormat; 36import android.graphics.Point; 37import android.graphics.PorterDuff; 38import android.graphics.PorterDuffXfermode; 39import android.graphics.Rect; 40import android.graphics.RectF; 41import android.graphics.Region; 42import android.graphics.Shader; 43import android.graphics.drawable.ColorDrawable; 44import android.graphics.drawable.Drawable; 45import android.os.Handler; 46import android.os.IBinder; 47import android.os.Message; 48import android.os.Parcel; 49import android.os.Parcelable; 50import android.os.RemoteException; 51import android.os.SystemClock; 52import android.util.AttributeSet; 53import android.util.Log; 54import android.util.Pool; 55import android.util.Poolable; 56import android.util.PoolableManager; 57import android.util.Pools; 58import android.util.SparseArray; 59import android.util.TypedValue; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.accessibility.AccessibilityEvent; 62import android.view.accessibility.AccessibilityEventSource; 63import android.view.accessibility.AccessibilityManager; 64import android.view.accessibility.AccessibilityNodeInfo; 65import android.view.animation.Animation; 66import android.view.animation.AnimationUtils; 67import android.view.inputmethod.EditorInfo; 68import android.view.inputmethod.InputConnection; 69import android.view.inputmethod.InputMethodManager; 70import android.widget.ScrollBarDrawable; 71 72import java.lang.ref.WeakReference; 73import java.lang.reflect.InvocationTargetException; 74import java.lang.reflect.Method; 75import java.util.ArrayList; 76import java.util.Arrays; 77import java.util.WeakHashMap; 78import java.util.concurrent.CopyOnWriteArrayList; 79 80/** 81 * <p> 82 * This class represents the basic building block for user interface components. A View 83 * occupies a rectangular area on the screen and is responsible for drawing and 84 * event handling. View is the base class for <em>widgets</em>, which are 85 * used to create interactive UI components (buttons, text fields, etc.). The 86 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 87 * are invisible containers that hold other Views (or other ViewGroups) and define 88 * their layout properties. 89 * </p> 90 * 91 * <div class="special"> 92 * <p>For an introduction to using this class to develop your 93 * application's user interface, read the Developer Guide documentation on 94 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 95 * include: 96 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 97 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 103 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 104 * </p> 105 * </div> 106 * 107 * <a name="Using"></a> 108 * <h3>Using Views</h3> 109 * <p> 110 * All of the views in a window are arranged in a single tree. You can add views 111 * either from code or by specifying a tree of views in one or more XML layout 112 * files. There are many specialized subclasses of views that act as controls or 113 * are capable of displaying text, images, or other content. 114 * </p> 115 * <p> 116 * Once you have created a tree of views, there are typically a few types of 117 * common operations you may wish to perform: 118 * <ul> 119 * <li><strong>Set properties:</strong> for example setting the text of a 120 * {@link android.widget.TextView}. The available properties and the methods 121 * that set them will vary among the different subclasses of views. Note that 122 * properties that are known at build time can be set in the XML layout 123 * files.</li> 124 * <li><strong>Set focus:</strong> The framework will handled moving focus in 125 * response to user input. To force focus to a specific view, call 126 * {@link #requestFocus}.</li> 127 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 128 * that will be notified when something interesting happens to the view. For 129 * example, all views will let you set a listener to be notified when the view 130 * gains or loses focus. You can register such a listener using 131 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 132 * Other view subclasses offer more specialized listeners. For example, a Button 133 * exposes a listener to notify clients when the button is clicked.</li> 134 * <li><strong>Set visibility:</strong> You can hide or show views using 135 * {@link #setVisibility(int)}.</li> 136 * </ul> 137 * </p> 138 * <p><em> 139 * Note: The Android framework is responsible for measuring, laying out and 140 * drawing views. You should not call methods that perform these actions on 141 * views yourself unless you are actually implementing a 142 * {@link android.view.ViewGroup}. 143 * </em></p> 144 * 145 * <a name="Lifecycle"></a> 146 * <h3>Implementing a Custom View</h3> 147 * 148 * <p> 149 * To implement a custom view, you will usually begin by providing overrides for 150 * some of the standard methods that the framework calls on all views. You do 151 * not need to override all of these methods. In fact, you can start by just 152 * overriding {@link #onDraw(android.graphics.Canvas)}. 153 * <table border="2" width="85%" align="center" cellpadding="5"> 154 * <thead> 155 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 156 * </thead> 157 * 158 * <tbody> 159 * <tr> 160 * <td rowspan="2">Creation</td> 161 * <td>Constructors</td> 162 * <td>There is a form of the constructor that are called when the view 163 * is created from code and a form that is called when the view is 164 * inflated from a layout file. The second form should parse and apply 165 * any attributes defined in the layout file. 166 * </td> 167 * </tr> 168 * <tr> 169 * <td><code>{@link #onFinishInflate()}</code></td> 170 * <td>Called after a view and all of its children has been inflated 171 * from XML.</td> 172 * </tr> 173 * 174 * <tr> 175 * <td rowspan="3">Layout</td> 176 * <td><code>{@link #onMeasure(int, int)}</code></td> 177 * <td>Called to determine the size requirements for this view and all 178 * of its children. 179 * </td> 180 * </tr> 181 * <tr> 182 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 183 * <td>Called when this view should assign a size and position to all 184 * of its children. 185 * </td> 186 * </tr> 187 * <tr> 188 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 189 * <td>Called when the size of this view has changed. 190 * </td> 191 * </tr> 192 * 193 * <tr> 194 * <td>Drawing</td> 195 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 196 * <td>Called when the view should render its content. 197 * </td> 198 * </tr> 199 * 200 * <tr> 201 * <td rowspan="4">Event processing</td> 202 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 203 * <td>Called when a new key event occurs. 204 * </td> 205 * </tr> 206 * <tr> 207 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 208 * <td>Called when a key up event occurs. 209 * </td> 210 * </tr> 211 * <tr> 212 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 213 * <td>Called when a trackball motion event occurs. 214 * </td> 215 * </tr> 216 * <tr> 217 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 218 * <td>Called when a touch screen motion event occurs. 219 * </td> 220 * </tr> 221 * 222 * <tr> 223 * <td rowspan="2">Focus</td> 224 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 225 * <td>Called when the view gains or loses focus. 226 * </td> 227 * </tr> 228 * 229 * <tr> 230 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 231 * <td>Called when the window containing the view gains or loses focus. 232 * </td> 233 * </tr> 234 * 235 * <tr> 236 * <td rowspan="3">Attaching</td> 237 * <td><code>{@link #onAttachedToWindow()}</code></td> 238 * <td>Called when the view is attached to a window. 239 * </td> 240 * </tr> 241 * 242 * <tr> 243 * <td><code>{@link #onDetachedFromWindow}</code></td> 244 * <td>Called when the view is detached from its window. 245 * </td> 246 * </tr> 247 * 248 * <tr> 249 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 250 * <td>Called when the visibility of the window containing the view 251 * has changed. 252 * </td> 253 * </tr> 254 * </tbody> 255 * 256 * </table> 257 * </p> 258 * 259 * <a name="IDs"></a> 260 * <h3>IDs</h3> 261 * Views may have an integer id associated with them. These ids are typically 262 * assigned in the layout XML files, and are used to find specific views within 263 * the view tree. A common pattern is to: 264 * <ul> 265 * <li>Define a Button in the layout file and assign it a unique ID. 266 * <pre> 267 * <Button 268 * android:id="@+id/my_button" 269 * android:layout_width="wrap_content" 270 * android:layout_height="wrap_content" 271 * android:text="@string/my_button_text"/> 272 * </pre></li> 273 * <li>From the onCreate method of an Activity, find the Button 274 * <pre class="prettyprint"> 275 * Button myButton = (Button) findViewById(R.id.my_button); 276 * </pre></li> 277 * </ul> 278 * <p> 279 * View IDs need not be unique throughout the tree, but it is good practice to 280 * ensure that they are at least unique within the part of the tree you are 281 * searching. 282 * </p> 283 * 284 * <a name="Position"></a> 285 * <h3>Position</h3> 286 * <p> 287 * The geometry of a view is that of a rectangle. A view has a location, 288 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 289 * two dimensions, expressed as a width and a height. The unit for location 290 * and dimensions is the pixel. 291 * </p> 292 * 293 * <p> 294 * It is possible to retrieve the location of a view by invoking the methods 295 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 296 * coordinate of the rectangle representing the view. The latter returns the 297 * top, or Y, coordinate of the rectangle representing the view. These methods 298 * both return the location of the view relative to its parent. For instance, 299 * when getLeft() returns 20, that means the view is located 20 pixels to the 300 * right of the left edge of its direct parent. 301 * </p> 302 * 303 * <p> 304 * In addition, several convenience methods are offered to avoid unnecessary 305 * computations, namely {@link #getRight()} and {@link #getBottom()}. 306 * These methods return the coordinates of the right and bottom edges of the 307 * rectangle representing the view. For instance, calling {@link #getRight()} 308 * is similar to the following computation: <code>getLeft() + getWidth()</code> 309 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 310 * </p> 311 * 312 * <a name="SizePaddingMargins"></a> 313 * <h3>Size, padding and margins</h3> 314 * <p> 315 * The size of a view is expressed with a width and a height. A view actually 316 * possess two pairs of width and height values. 317 * </p> 318 * 319 * <p> 320 * The first pair is known as <em>measured width</em> and 321 * <em>measured height</em>. These dimensions define how big a view wants to be 322 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 323 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 324 * and {@link #getMeasuredHeight()}. 325 * </p> 326 * 327 * <p> 328 * The second pair is simply known as <em>width</em> and <em>height</em>, or 329 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 330 * dimensions define the actual size of the view on screen, at drawing time and 331 * after layout. These values may, but do not have to, be different from the 332 * measured width and height. The width and height can be obtained by calling 333 * {@link #getWidth()} and {@link #getHeight()}. 334 * </p> 335 * 336 * <p> 337 * To measure its dimensions, a view takes into account its padding. The padding 338 * is expressed in pixels for the left, top, right and bottom parts of the view. 339 * Padding can be used to offset the content of the view by a specific amount of 340 * pixels. For instance, a left padding of 2 will push the view's content by 341 * 2 pixels to the right of the left edge. Padding can be set using the 342 * {@link #setPadding(int, int, int, int)} method and queried by calling 343 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 344 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 345 * </p> 346 * 347 * <p> 348 * Even though a view can define a padding, it does not provide any support for 349 * margins. However, view groups provide such a support. Refer to 350 * {@link android.view.ViewGroup} and 351 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 352 * </p> 353 * 354 * <a name="Layout"></a> 355 * <h3>Layout</h3> 356 * <p> 357 * Layout is a two pass process: a measure pass and a layout pass. The measuring 358 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 359 * of the view tree. Each view pushes dimension specifications down the tree 360 * during the recursion. At the end of the measure pass, every view has stored 361 * its measurements. The second pass happens in 362 * {@link #layout(int,int,int,int)} and is also top-down. During 363 * this pass each parent is responsible for positioning all of its children 364 * using the sizes computed in the measure pass. 365 * </p> 366 * 367 * <p> 368 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 369 * {@link #getMeasuredHeight()} values must be set, along with those for all of 370 * that view's descendants. A view's measured width and measured height values 371 * must respect the constraints imposed by the view's parents. This guarantees 372 * that at the end of the measure pass, all parents accept all of their 373 * children's measurements. A parent view may call measure() more than once on 374 * its children. For example, the parent may measure each child once with 375 * unspecified dimensions to find out how big they want to be, then call 376 * measure() on them again with actual numbers if the sum of all the children's 377 * unconstrained sizes is too big or too small. 378 * </p> 379 * 380 * <p> 381 * The measure pass uses two classes to communicate dimensions. The 382 * {@link MeasureSpec} class is used by views to tell their parents how they 383 * want to be measured and positioned. The base LayoutParams class just 384 * describes how big the view wants to be for both width and height. For each 385 * dimension, it can specify one of: 386 * <ul> 387 * <li> an exact number 388 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 389 * (minus padding) 390 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 391 * enclose its content (plus padding). 392 * </ul> 393 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 394 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 395 * an X and Y value. 396 * </p> 397 * 398 * <p> 399 * MeasureSpecs are used to push requirements down the tree from parent to 400 * child. A MeasureSpec can be in one of three modes: 401 * <ul> 402 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 403 * of a child view. For example, a LinearLayout may call measure() on its child 404 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 405 * tall the child view wants to be given a width of 240 pixels. 406 * <li>EXACTLY: This is used by the parent to impose an exact size on the 407 * child. The child must use this size, and guarantee that all of its 408 * descendants will fit within this size. 409 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 410 * child. The child must gurantee that it and all of its descendants will fit 411 * within this size. 412 * </ul> 413 * </p> 414 * 415 * <p> 416 * To intiate a layout, call {@link #requestLayout}. This method is typically 417 * called by a view on itself when it believes that is can no longer fit within 418 * its current bounds. 419 * </p> 420 * 421 * <a name="Drawing"></a> 422 * <h3>Drawing</h3> 423 * <p> 424 * Drawing is handled by walking the tree and rendering each view that 425 * intersects the the invalid region. Because the tree is traversed in-order, 426 * this means that parents will draw before (i.e., behind) their children, with 427 * siblings drawn in the order they appear in the tree. 428 * If you set a background drawable for a View, then the View will draw it for you 429 * before calling back to its <code>onDraw()</code> method. 430 * </p> 431 * 432 * <p> 433 * Note that the framework will not draw views that are not in the invalid region. 434 * </p> 435 * 436 * <p> 437 * To force a view to draw, call {@link #invalidate()}. 438 * </p> 439 * 440 * <a name="EventHandlingThreading"></a> 441 * <h3>Event Handling and Threading</h3> 442 * <p> 443 * The basic cycle of a view is as follows: 444 * <ol> 445 * <li>An event comes in and is dispatched to the appropriate view. The view 446 * handles the event and notifies any listeners.</li> 447 * <li>If in the course of processing the event, the view's bounds may need 448 * to be changed, the view will call {@link #requestLayout()}.</li> 449 * <li>Similarly, if in the course of processing the event the view's appearance 450 * may need to be changed, the view will call {@link #invalidate()}.</li> 451 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 452 * the framework will take care of measuring, laying out, and drawing the tree 453 * as appropriate.</li> 454 * </ol> 455 * </p> 456 * 457 * <p><em>Note: The entire view tree is single threaded. You must always be on 458 * the UI thread when calling any method on any view.</em> 459 * If you are doing work on other threads and want to update the state of a view 460 * from that thread, you should use a {@link Handler}. 461 * </p> 462 * 463 * <a name="FocusHandling"></a> 464 * <h3>Focus Handling</h3> 465 * <p> 466 * The framework will handle routine focus movement in response to user input. 467 * This includes changing the focus as views are removed or hidden, or as new 468 * views become available. Views indicate their willingness to take focus 469 * through the {@link #isFocusable} method. To change whether a view can take 470 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 471 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 472 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 473 * </p> 474 * <p> 475 * Focus movement is based on an algorithm which finds the nearest neighbor in a 476 * given direction. In rare cases, the default algorithm may not match the 477 * intended behavior of the developer. In these situations, you can provide 478 * explicit overrides by using these XML attributes in the layout file: 479 * <pre> 480 * nextFocusDown 481 * nextFocusLeft 482 * nextFocusRight 483 * nextFocusUp 484 * </pre> 485 * </p> 486 * 487 * 488 * <p> 489 * To get a particular view to take focus, call {@link #requestFocus()}. 490 * </p> 491 * 492 * <a name="TouchMode"></a> 493 * <h3>Touch Mode</h3> 494 * <p> 495 * When a user is navigating a user interface via directional keys such as a D-pad, it is 496 * necessary to give focus to actionable items such as buttons so the user can see 497 * what will take input. If the device has touch capabilities, however, and the user 498 * begins interacting with the interface by touching it, it is no longer necessary to 499 * always highlight, or give focus to, a particular view. This motivates a mode 500 * for interaction named 'touch mode'. 501 * </p> 502 * <p> 503 * For a touch capable device, once the user touches the screen, the device 504 * will enter touch mode. From this point onward, only views for which 505 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 506 * Other views that are touchable, like buttons, will not take focus when touched; they will 507 * only fire the on click listeners. 508 * </p> 509 * <p> 510 * Any time a user hits a directional key, such as a D-pad direction, the view device will 511 * exit touch mode, and find a view to take focus, so that the user may resume interacting 512 * with the user interface without touching the screen again. 513 * </p> 514 * <p> 515 * The touch mode state is maintained across {@link android.app.Activity}s. Call 516 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 517 * </p> 518 * 519 * <a name="Scrolling"></a> 520 * <h3>Scrolling</h3> 521 * <p> 522 * The framework provides basic support for views that wish to internally 523 * scroll their content. This includes keeping track of the X and Y scroll 524 * offset as well as mechanisms for drawing scrollbars. See 525 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 526 * {@link #awakenScrollBars()} for more details. 527 * </p> 528 * 529 * <a name="Tags"></a> 530 * <h3>Tags</h3> 531 * <p> 532 * Unlike IDs, tags are not used to identify views. Tags are essentially an 533 * extra piece of information that can be associated with a view. They are most 534 * often used as a convenience to store data related to views in the views 535 * themselves rather than by putting them in a separate structure. 536 * </p> 537 * 538 * <a name="Animation"></a> 539 * <h3>Animation</h3> 540 * <p> 541 * You can attach an {@link Animation} object to a view using 542 * {@link #setAnimation(Animation)} or 543 * {@link #startAnimation(Animation)}. The animation can alter the scale, 544 * rotation, translation and alpha of a view over time. If the animation is 545 * attached to a view that has children, the animation will affect the entire 546 * subtree rooted by that node. When an animation is started, the framework will 547 * take care of redrawing the appropriate views until the animation completes. 548 * </p> 549 * <p> 550 * Starting with Android 3.0, the preferred way of animating views is to use the 551 * {@link android.animation} package APIs. 552 * </p> 553 * 554 * <a name="Security"></a> 555 * <h3>Security</h3> 556 * <p> 557 * Sometimes it is essential that an application be able to verify that an action 558 * is being performed with the full knowledge and consent of the user, such as 559 * granting a permission request, making a purchase or clicking on an advertisement. 560 * Unfortunately, a malicious application could try to spoof the user into 561 * performing these actions, unaware, by concealing the intended purpose of the view. 562 * As a remedy, the framework offers a touch filtering mechanism that can be used to 563 * improve the security of views that provide access to sensitive functionality. 564 * </p><p> 565 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 566 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 567 * will discard touches that are received whenever the view's window is obscured by 568 * another visible window. As a result, the view will not receive touches whenever a 569 * toast, dialog or other window appears above the view's window. 570 * </p><p> 571 * For more fine-grained control over security, consider overriding the 572 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 573 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 574 * </p> 575 * 576 * @attr ref android.R.styleable#View_alpha 577 * @attr ref android.R.styleable#View_background 578 * @attr ref android.R.styleable#View_clickable 579 * @attr ref android.R.styleable#View_contentDescription 580 * @attr ref android.R.styleable#View_drawingCacheQuality 581 * @attr ref android.R.styleable#View_duplicateParentState 582 * @attr ref android.R.styleable#View_id 583 * @attr ref android.R.styleable#View_fadingEdge 584 * @attr ref android.R.styleable#View_fadingEdgeLength 585 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 586 * @attr ref android.R.styleable#View_fitsSystemWindows 587 * @attr ref android.R.styleable#View_isScrollContainer 588 * @attr ref android.R.styleable#View_focusable 589 * @attr ref android.R.styleable#View_focusableInTouchMode 590 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 591 * @attr ref android.R.styleable#View_keepScreenOn 592 * @attr ref android.R.styleable#View_layerType 593 * @attr ref android.R.styleable#View_longClickable 594 * @attr ref android.R.styleable#View_minHeight 595 * @attr ref android.R.styleable#View_minWidth 596 * @attr ref android.R.styleable#View_nextFocusDown 597 * @attr ref android.R.styleable#View_nextFocusLeft 598 * @attr ref android.R.styleable#View_nextFocusRight 599 * @attr ref android.R.styleable#View_nextFocusUp 600 * @attr ref android.R.styleable#View_onClick 601 * @attr ref android.R.styleable#View_padding 602 * @attr ref android.R.styleable#View_paddingBottom 603 * @attr ref android.R.styleable#View_paddingLeft 604 * @attr ref android.R.styleable#View_paddingRight 605 * @attr ref android.R.styleable#View_paddingTop 606 * @attr ref android.R.styleable#View_saveEnabled 607 * @attr ref android.R.styleable#View_rotation 608 * @attr ref android.R.styleable#View_rotationX 609 * @attr ref android.R.styleable#View_rotationY 610 * @attr ref android.R.styleable#View_scaleX 611 * @attr ref android.R.styleable#View_scaleY 612 * @attr ref android.R.styleable#View_scrollX 613 * @attr ref android.R.styleable#View_scrollY 614 * @attr ref android.R.styleable#View_scrollbarSize 615 * @attr ref android.R.styleable#View_scrollbarStyle 616 * @attr ref android.R.styleable#View_scrollbars 617 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 618 * @attr ref android.R.styleable#View_scrollbarFadeDuration 619 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 621 * @attr ref android.R.styleable#View_scrollbarThumbVertical 622 * @attr ref android.R.styleable#View_scrollbarTrackVertical 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 624 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 625 * @attr ref android.R.styleable#View_soundEffectsEnabled 626 * @attr ref android.R.styleable#View_tag 627 * @attr ref android.R.styleable#View_transformPivotX 628 * @attr ref android.R.styleable#View_transformPivotY 629 * @attr ref android.R.styleable#View_translationX 630 * @attr ref android.R.styleable#View_translationY 631 * @attr ref android.R.styleable#View_visibility 632 * 633 * @see android.view.ViewGroup 634 */ 635public class View implements Drawable.Callback2, KeyEvent.Callback, AccessibilityEventSource { 636 private static final boolean DBG = false; 637 638 /** 639 * The logging tag used by this class with android.util.Log. 640 */ 641 protected static final String VIEW_LOG_TAG = "View"; 642 643 /** 644 * Used to mark a View that has no ID. 645 */ 646 public static final int NO_ID = -1; 647 648 /** 649 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 650 * calling setFlags. 651 */ 652 private static final int NOT_FOCUSABLE = 0x00000000; 653 654 /** 655 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 656 * setFlags. 657 */ 658 private static final int FOCUSABLE = 0x00000001; 659 660 /** 661 * Mask for use with setFlags indicating bits used for focus. 662 */ 663 private static final int FOCUSABLE_MASK = 0x00000001; 664 665 /** 666 * This view will adjust its padding to fit sytem windows (e.g. status bar) 667 */ 668 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 669 670 /** 671 * This view is visible. Use with {@link #setVisibility(int)}. 672 */ 673 public static final int VISIBLE = 0x00000000; 674 675 /** 676 * This view is invisible, but it still takes up space for layout purposes. 677 * Use with {@link #setVisibility(int)}. 678 */ 679 public static final int INVISIBLE = 0x00000004; 680 681 /** 682 * This view is invisible, and it doesn't take any space for layout 683 * purposes. Use with {@link #setVisibility(int)}. 684 */ 685 public static final int GONE = 0x00000008; 686 687 /** 688 * Mask for use with setFlags indicating bits used for visibility. 689 * {@hide} 690 */ 691 static final int VISIBILITY_MASK = 0x0000000C; 692 693 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 694 695 /** 696 * This view is enabled. Intrepretation varies by subclass. 697 * Use with ENABLED_MASK when calling setFlags. 698 * {@hide} 699 */ 700 static final int ENABLED = 0x00000000; 701 702 /** 703 * This view is disabled. Intrepretation varies by subclass. 704 * Use with ENABLED_MASK when calling setFlags. 705 * {@hide} 706 */ 707 static final int DISABLED = 0x00000020; 708 709 /** 710 * Mask for use with setFlags indicating bits used for indicating whether 711 * this view is enabled 712 * {@hide} 713 */ 714 static final int ENABLED_MASK = 0x00000020; 715 716 /** 717 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 718 * called and further optimizations will be performed. It is okay to have 719 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 720 * {@hide} 721 */ 722 static final int WILL_NOT_DRAW = 0x00000080; 723 724 /** 725 * Mask for use with setFlags indicating bits used for indicating whether 726 * this view is will draw 727 * {@hide} 728 */ 729 static final int DRAW_MASK = 0x00000080; 730 731 /** 732 * <p>This view doesn't show scrollbars.</p> 733 * {@hide} 734 */ 735 static final int SCROLLBARS_NONE = 0x00000000; 736 737 /** 738 * <p>This view shows horizontal scrollbars.</p> 739 * {@hide} 740 */ 741 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 742 743 /** 744 * <p>This view shows vertical scrollbars.</p> 745 * {@hide} 746 */ 747 static final int SCROLLBARS_VERTICAL = 0x00000200; 748 749 /** 750 * <p>Mask for use with setFlags indicating bits used for indicating which 751 * scrollbars are enabled.</p> 752 * {@hide} 753 */ 754 static final int SCROLLBARS_MASK = 0x00000300; 755 756 /** 757 * Indicates that the view should filter touches when its window is obscured. 758 * Refer to the class comments for more information about this security feature. 759 * {@hide} 760 */ 761 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 762 763 // note flag value 0x00000800 is now available for next flags... 764 765 /** 766 * <p>This view doesn't show fading edges.</p> 767 * {@hide} 768 */ 769 static final int FADING_EDGE_NONE = 0x00000000; 770 771 /** 772 * <p>This view shows horizontal fading edges.</p> 773 * {@hide} 774 */ 775 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 776 777 /** 778 * <p>This view shows vertical fading edges.</p> 779 * {@hide} 780 */ 781 static final int FADING_EDGE_VERTICAL = 0x00002000; 782 783 /** 784 * <p>Mask for use with setFlags indicating bits used for indicating which 785 * fading edges are enabled.</p> 786 * {@hide} 787 */ 788 static final int FADING_EDGE_MASK = 0x00003000; 789 790 /** 791 * <p>Indicates this view can be clicked. When clickable, a View reacts 792 * to clicks by notifying the OnClickListener.<p> 793 * {@hide} 794 */ 795 static final int CLICKABLE = 0x00004000; 796 797 /** 798 * <p>Indicates this view is caching its drawing into a bitmap.</p> 799 * {@hide} 800 */ 801 static final int DRAWING_CACHE_ENABLED = 0x00008000; 802 803 /** 804 * <p>Indicates that no icicle should be saved for this view.<p> 805 * {@hide} 806 */ 807 static final int SAVE_DISABLED = 0x000010000; 808 809 /** 810 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 811 * property.</p> 812 * {@hide} 813 */ 814 static final int SAVE_DISABLED_MASK = 0x000010000; 815 816 /** 817 * <p>Indicates that no drawing cache should ever be created for this view.<p> 818 * {@hide} 819 */ 820 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 821 822 /** 823 * <p>Indicates this view can take / keep focus when int touch mode.</p> 824 * {@hide} 825 */ 826 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 827 828 /** 829 * <p>Enables low quality mode for the drawing cache.</p> 830 */ 831 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 832 833 /** 834 * <p>Enables high quality mode for the drawing cache.</p> 835 */ 836 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 837 838 /** 839 * <p>Enables automatic quality mode for the drawing cache.</p> 840 */ 841 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 842 843 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 844 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 845 }; 846 847 /** 848 * <p>Mask for use with setFlags indicating bits used for the cache 849 * quality property.</p> 850 * {@hide} 851 */ 852 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 853 854 /** 855 * <p> 856 * Indicates this view can be long clicked. When long clickable, a View 857 * reacts to long clicks by notifying the OnLongClickListener or showing a 858 * context menu. 859 * </p> 860 * {@hide} 861 */ 862 static final int LONG_CLICKABLE = 0x00200000; 863 864 /** 865 * <p>Indicates that this view gets its drawable states from its direct parent 866 * and ignores its original internal states.</p> 867 * 868 * @hide 869 */ 870 static final int DUPLICATE_PARENT_STATE = 0x00400000; 871 872 /** 873 * The scrollbar style to display the scrollbars inside the content area, 874 * without increasing the padding. The scrollbars will be overlaid with 875 * translucency on the view's content. 876 */ 877 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 878 879 /** 880 * The scrollbar style to display the scrollbars inside the padded area, 881 * increasing the padding of the view. The scrollbars will not overlap the 882 * content area of the view. 883 */ 884 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 885 886 /** 887 * The scrollbar style to display the scrollbars at the edge of the view, 888 * without increasing the padding. The scrollbars will be overlaid with 889 * translucency. 890 */ 891 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 892 893 /** 894 * The scrollbar style to display the scrollbars at the edge of the view, 895 * increasing the padding of the view. The scrollbars will only overlap the 896 * background, if any. 897 */ 898 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 899 900 /** 901 * Mask to check if the scrollbar style is overlay or inset. 902 * {@hide} 903 */ 904 static final int SCROLLBARS_INSET_MASK = 0x01000000; 905 906 /** 907 * Mask to check if the scrollbar style is inside or outside. 908 * {@hide} 909 */ 910 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 911 912 /** 913 * Mask for scrollbar style. 914 * {@hide} 915 */ 916 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 917 918 /** 919 * View flag indicating that the screen should remain on while the 920 * window containing this view is visible to the user. This effectively 921 * takes care of automatically setting the WindowManager's 922 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 923 */ 924 public static final int KEEP_SCREEN_ON = 0x04000000; 925 926 /** 927 * View flag indicating whether this view should have sound effects enabled 928 * for events such as clicking and touching. 929 */ 930 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 931 932 /** 933 * View flag indicating whether this view should have haptic feedback 934 * enabled for events such as long presses. 935 */ 936 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 937 938 /** 939 * <p>Indicates that the view hierarchy should stop saving state when 940 * it reaches this view. If state saving is initiated immediately at 941 * the view, it will be allowed. 942 * {@hide} 943 */ 944 static final int PARENT_SAVE_DISABLED = 0x20000000; 945 946 /** 947 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 948 * {@hide} 949 */ 950 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 951 952 /** 953 * Horizontal direction of this view is from Left to Right. 954 * Use with {@link #setLayoutDirection}. 955 * {@hide} 956 */ 957 public static final int LAYOUT_DIRECTION_LTR = 0x00000000; 958 959 /** 960 * Horizontal direction of this view is from Right to Left. 961 * Use with {@link #setLayoutDirection}. 962 * {@hide} 963 */ 964 public static final int LAYOUT_DIRECTION_RTL = 0x40000000; 965 966 /** 967 * Horizontal direction of this view is inherited from its parent. 968 * Use with {@link #setLayoutDirection}. 969 * {@hide} 970 */ 971 public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000; 972 973 /** 974 * Horizontal direction of this view is from deduced from the default language 975 * script for the locale. Use with {@link #setLayoutDirection}. 976 * {@hide} 977 */ 978 public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000; 979 980 /** 981 * Mask for use with setFlags indicating bits used for horizontalDirection. 982 * {@hide} 983 */ 984 static final int LAYOUT_DIRECTION_MASK = 0xC0000000; 985 986 /* 987 * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct 988 * flag value. 989 * {@hide} 990 */ 991 private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR, 992 LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE}; 993 994 /** 995 * Default horizontalDirection. 996 * {@hide} 997 */ 998 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 999 1000 /** 1001 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1002 * should add all focusable Views regardless if they are focusable in touch mode. 1003 */ 1004 public static final int FOCUSABLES_ALL = 0x00000000; 1005 1006 /** 1007 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1008 * should add only Views focusable in touch mode. 1009 */ 1010 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1011 1012 /** 1013 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1014 * item. 1015 */ 1016 public static final int FOCUS_BACKWARD = 0x00000001; 1017 1018 /** 1019 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1020 * item. 1021 */ 1022 public static final int FOCUS_FORWARD = 0x00000002; 1023 1024 /** 1025 * Use with {@link #focusSearch(int)}. Move focus to the left. 1026 */ 1027 public static final int FOCUS_LEFT = 0x00000011; 1028 1029 /** 1030 * Use with {@link #focusSearch(int)}. Move focus up. 1031 */ 1032 public static final int FOCUS_UP = 0x00000021; 1033 1034 /** 1035 * Use with {@link #focusSearch(int)}. Move focus to the right. 1036 */ 1037 public static final int FOCUS_RIGHT = 0x00000042; 1038 1039 /** 1040 * Use with {@link #focusSearch(int)}. Move focus down. 1041 */ 1042 public static final int FOCUS_DOWN = 0x00000082; 1043 1044 /** 1045 * Bits of {@link #getMeasuredWidthAndState()} and 1046 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1047 */ 1048 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1049 1050 /** 1051 * Bits of {@link #getMeasuredWidthAndState()} and 1052 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1053 */ 1054 public static final int MEASURED_STATE_MASK = 0xff000000; 1055 1056 /** 1057 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1058 * for functions that combine both width and height into a single int, 1059 * such as {@link #getMeasuredState()} and the childState argument of 1060 * {@link #resolveSizeAndState(int, int, int)}. 1061 */ 1062 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1063 1064 /** 1065 * Bit of {@link #getMeasuredWidthAndState()} and 1066 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1067 * is smaller that the space the view would like to have. 1068 */ 1069 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1070 1071 /** 1072 * Base View state sets 1073 */ 1074 // Singles 1075 /** 1076 * Indicates the view has no states set. States are used with 1077 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1078 * view depending on its state. 1079 * 1080 * @see android.graphics.drawable.Drawable 1081 * @see #getDrawableState() 1082 */ 1083 protected static final int[] EMPTY_STATE_SET; 1084 /** 1085 * Indicates the view is enabled. 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[] ENABLED_STATE_SET; 1093 /** 1094 * Indicates the view is focused. 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[] FOCUSED_STATE_SET; 1102 /** 1103 * Indicates the view is selected. 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[] SELECTED_STATE_SET; 1111 /** 1112 * Indicates the view is pressed. 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 * @hide 1119 */ 1120 protected static final int[] PRESSED_STATE_SET; 1121 /** 1122 * Indicates the view's window has focus. States are used with 1123 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1124 * view depending on its state. 1125 * 1126 * @see android.graphics.drawable.Drawable 1127 * @see #getDrawableState() 1128 */ 1129 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1130 // Doubles 1131 /** 1132 * Indicates the view is enabled and has the focus. 1133 * 1134 * @see #ENABLED_STATE_SET 1135 * @see #FOCUSED_STATE_SET 1136 */ 1137 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1138 /** 1139 * Indicates the view is enabled and selected. 1140 * 1141 * @see #ENABLED_STATE_SET 1142 * @see #SELECTED_STATE_SET 1143 */ 1144 protected static final int[] ENABLED_SELECTED_STATE_SET; 1145 /** 1146 * Indicates the view is enabled and that its window has focus. 1147 * 1148 * @see #ENABLED_STATE_SET 1149 * @see #WINDOW_FOCUSED_STATE_SET 1150 */ 1151 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1152 /** 1153 * Indicates the view is focused and selected. 1154 * 1155 * @see #FOCUSED_STATE_SET 1156 * @see #SELECTED_STATE_SET 1157 */ 1158 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1159 /** 1160 * Indicates the view has the focus and that its window has the focus. 1161 * 1162 * @see #FOCUSED_STATE_SET 1163 * @see #WINDOW_FOCUSED_STATE_SET 1164 */ 1165 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1166 /** 1167 * Indicates the view is selected and that its window has the focus. 1168 * 1169 * @see #SELECTED_STATE_SET 1170 * @see #WINDOW_FOCUSED_STATE_SET 1171 */ 1172 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1173 // Triples 1174 /** 1175 * Indicates the view is enabled, focused and selected. 1176 * 1177 * @see #ENABLED_STATE_SET 1178 * @see #FOCUSED_STATE_SET 1179 * @see #SELECTED_STATE_SET 1180 */ 1181 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1182 /** 1183 * Indicates the view is enabled, focused and its window has the focus. 1184 * 1185 * @see #ENABLED_STATE_SET 1186 * @see #FOCUSED_STATE_SET 1187 * @see #WINDOW_FOCUSED_STATE_SET 1188 */ 1189 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1190 /** 1191 * Indicates the view is enabled, selected and its window has the focus. 1192 * 1193 * @see #ENABLED_STATE_SET 1194 * @see #SELECTED_STATE_SET 1195 * @see #WINDOW_FOCUSED_STATE_SET 1196 */ 1197 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1198 /** 1199 * Indicates the view is focused, selected and its window has the focus. 1200 * 1201 * @see #FOCUSED_STATE_SET 1202 * @see #SELECTED_STATE_SET 1203 * @see #WINDOW_FOCUSED_STATE_SET 1204 */ 1205 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1206 /** 1207 * Indicates the view is enabled, focused, selected and its window 1208 * has the focus. 1209 * 1210 * @see #ENABLED_STATE_SET 1211 * @see #FOCUSED_STATE_SET 1212 * @see #SELECTED_STATE_SET 1213 * @see #WINDOW_FOCUSED_STATE_SET 1214 */ 1215 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1216 /** 1217 * Indicates the view is pressed and its window has the focus. 1218 * 1219 * @see #PRESSED_STATE_SET 1220 * @see #WINDOW_FOCUSED_STATE_SET 1221 */ 1222 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1223 /** 1224 * Indicates the view is pressed and selected. 1225 * 1226 * @see #PRESSED_STATE_SET 1227 * @see #SELECTED_STATE_SET 1228 */ 1229 protected static final int[] PRESSED_SELECTED_STATE_SET; 1230 /** 1231 * Indicates the view is pressed, selected and its window has the focus. 1232 * 1233 * @see #PRESSED_STATE_SET 1234 * @see #SELECTED_STATE_SET 1235 * @see #WINDOW_FOCUSED_STATE_SET 1236 */ 1237 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1238 /** 1239 * Indicates the view is pressed and focused. 1240 * 1241 * @see #PRESSED_STATE_SET 1242 * @see #FOCUSED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed, focused and its window has the focus. 1247 * 1248 * @see #PRESSED_STATE_SET 1249 * @see #FOCUSED_STATE_SET 1250 * @see #WINDOW_FOCUSED_STATE_SET 1251 */ 1252 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1253 /** 1254 * Indicates the view is pressed, focused and selected. 1255 * 1256 * @see #PRESSED_STATE_SET 1257 * @see #SELECTED_STATE_SET 1258 * @see #FOCUSED_STATE_SET 1259 */ 1260 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1261 /** 1262 * Indicates the view is pressed, focused, selected and its window has the focus. 1263 * 1264 * @see #PRESSED_STATE_SET 1265 * @see #FOCUSED_STATE_SET 1266 * @see #SELECTED_STATE_SET 1267 * @see #WINDOW_FOCUSED_STATE_SET 1268 */ 1269 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1270 /** 1271 * Indicates the view is pressed and enabled. 1272 * 1273 * @see #PRESSED_STATE_SET 1274 * @see #ENABLED_STATE_SET 1275 */ 1276 protected static final int[] PRESSED_ENABLED_STATE_SET; 1277 /** 1278 * Indicates the view is pressed, enabled and its window has the focus. 1279 * 1280 * @see #PRESSED_STATE_SET 1281 * @see #ENABLED_STATE_SET 1282 * @see #WINDOW_FOCUSED_STATE_SET 1283 */ 1284 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1285 /** 1286 * Indicates the view is pressed, enabled and selected. 1287 * 1288 * @see #PRESSED_STATE_SET 1289 * @see #ENABLED_STATE_SET 1290 * @see #SELECTED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1293 /** 1294 * Indicates the view is pressed, enabled, selected and its window has the 1295 * focus. 1296 * 1297 * @see #PRESSED_STATE_SET 1298 * @see #ENABLED_STATE_SET 1299 * @see #SELECTED_STATE_SET 1300 * @see #WINDOW_FOCUSED_STATE_SET 1301 */ 1302 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1303 /** 1304 * Indicates the view is pressed, enabled and focused. 1305 * 1306 * @see #PRESSED_STATE_SET 1307 * @see #ENABLED_STATE_SET 1308 * @see #FOCUSED_STATE_SET 1309 */ 1310 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1311 /** 1312 * Indicates the view is pressed, enabled, focused and its window has the 1313 * focus. 1314 * 1315 * @see #PRESSED_STATE_SET 1316 * @see #ENABLED_STATE_SET 1317 * @see #FOCUSED_STATE_SET 1318 * @see #WINDOW_FOCUSED_STATE_SET 1319 */ 1320 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1321 /** 1322 * Indicates the view is pressed, enabled, focused and selected. 1323 * 1324 * @see #PRESSED_STATE_SET 1325 * @see #ENABLED_STATE_SET 1326 * @see #SELECTED_STATE_SET 1327 * @see #FOCUSED_STATE_SET 1328 */ 1329 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1330 /** 1331 * Indicates the view is pressed, enabled, focused, selected and its window 1332 * has the focus. 1333 * 1334 * @see #PRESSED_STATE_SET 1335 * @see #ENABLED_STATE_SET 1336 * @see #SELECTED_STATE_SET 1337 * @see #FOCUSED_STATE_SET 1338 * @see #WINDOW_FOCUSED_STATE_SET 1339 */ 1340 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1341 1342 /** 1343 * The order here is very important to {@link #getDrawableState()} 1344 */ 1345 private static final int[][] VIEW_STATE_SETS; 1346 1347 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1348 static final int VIEW_STATE_SELECTED = 1 << 1; 1349 static final int VIEW_STATE_FOCUSED = 1 << 2; 1350 static final int VIEW_STATE_ENABLED = 1 << 3; 1351 static final int VIEW_STATE_PRESSED = 1 << 4; 1352 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1353 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1354 static final int VIEW_STATE_HOVERED = 1 << 7; 1355 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1356 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1357 1358 static final int[] VIEW_STATE_IDS = new int[] { 1359 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1360 R.attr.state_selected, VIEW_STATE_SELECTED, 1361 R.attr.state_focused, VIEW_STATE_FOCUSED, 1362 R.attr.state_enabled, VIEW_STATE_ENABLED, 1363 R.attr.state_pressed, VIEW_STATE_PRESSED, 1364 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1365 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1366 R.attr.state_hovered, VIEW_STATE_HOVERED, 1367 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1368 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1369 }; 1370 1371 static { 1372 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1373 throw new IllegalStateException( 1374 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1375 } 1376 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1377 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1378 int viewState = R.styleable.ViewDrawableStates[i]; 1379 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1380 if (VIEW_STATE_IDS[j] == viewState) { 1381 orderedIds[i * 2] = viewState; 1382 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1383 } 1384 } 1385 } 1386 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1387 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1388 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1389 int numBits = Integer.bitCount(i); 1390 int[] set = new int[numBits]; 1391 int pos = 0; 1392 for (int j = 0; j < orderedIds.length; j += 2) { 1393 if ((i & orderedIds[j+1]) != 0) { 1394 set[pos++] = orderedIds[j]; 1395 } 1396 } 1397 VIEW_STATE_SETS[i] = set; 1398 } 1399 1400 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1401 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1402 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1403 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1404 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1405 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1406 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1407 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1408 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1409 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1410 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1412 | VIEW_STATE_FOCUSED]; 1413 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1414 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1415 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1416 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1418 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_ENABLED]; 1421 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1422 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1423 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1424 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1425 | VIEW_STATE_ENABLED]; 1426 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1427 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1428 | VIEW_STATE_ENABLED]; 1429 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1430 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1431 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1432 1433 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1434 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1435 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1436 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1437 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1438 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1439 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1440 | VIEW_STATE_PRESSED]; 1441 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1442 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1443 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1445 | VIEW_STATE_PRESSED]; 1446 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1448 | VIEW_STATE_PRESSED]; 1449 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1451 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1452 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1453 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1454 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1456 | VIEW_STATE_PRESSED]; 1457 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1459 | VIEW_STATE_PRESSED]; 1460 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1462 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1463 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1464 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1465 | VIEW_STATE_PRESSED]; 1466 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1467 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1468 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1469 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1470 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1471 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1472 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1473 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1474 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1475 | VIEW_STATE_PRESSED]; 1476 } 1477 1478 /** 1479 * Temporary Rect currently for use in setBackground(). This will probably 1480 * be extended in the future to hold our own class with more than just 1481 * a Rect. :) 1482 */ 1483 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1484 1485 /** 1486 * Map used to store views' tags. 1487 */ 1488 private static WeakHashMap<View, SparseArray<Object>> sTags; 1489 1490 /** 1491 * Lock used to access sTags. 1492 */ 1493 private static final Object sTagsLock = new Object(); 1494 1495 /** 1496 * The next available accessiiblity id. 1497 */ 1498 private static int sNextAccessibilityViewId; 1499 1500 /** 1501 * The animation currently associated with this view. 1502 * @hide 1503 */ 1504 protected Animation mCurrentAnimation = null; 1505 1506 /** 1507 * Width as measured during measure pass. 1508 * {@hide} 1509 */ 1510 @ViewDebug.ExportedProperty(category = "measurement") 1511 int mMeasuredWidth; 1512 1513 /** 1514 * Height as measured during measure pass. 1515 * {@hide} 1516 */ 1517 @ViewDebug.ExportedProperty(category = "measurement") 1518 int mMeasuredHeight; 1519 1520 /** 1521 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1522 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1523 * its display list. This flag, used only when hw accelerated, allows us to clear the 1524 * flag while retaining this information until it's needed (at getDisplayList() time and 1525 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1526 * 1527 * {@hide} 1528 */ 1529 boolean mRecreateDisplayList = false; 1530 1531 /** 1532 * The view's identifier. 1533 * {@hide} 1534 * 1535 * @see #setId(int) 1536 * @see #getId() 1537 */ 1538 @ViewDebug.ExportedProperty(resolveId = true) 1539 int mID = NO_ID; 1540 1541 /** 1542 * The stable ID of this view for accessibility porposes. 1543 */ 1544 int mAccessibilityViewId = NO_ID; 1545 1546 /** 1547 * The view's tag. 1548 * {@hide} 1549 * 1550 * @see #setTag(Object) 1551 * @see #getTag() 1552 */ 1553 protected Object mTag; 1554 1555 // for mPrivateFlags: 1556 /** {@hide} */ 1557 static final int WANTS_FOCUS = 0x00000001; 1558 /** {@hide} */ 1559 static final int FOCUSED = 0x00000002; 1560 /** {@hide} */ 1561 static final int SELECTED = 0x00000004; 1562 /** {@hide} */ 1563 static final int IS_ROOT_NAMESPACE = 0x00000008; 1564 /** {@hide} */ 1565 static final int HAS_BOUNDS = 0x00000010; 1566 /** {@hide} */ 1567 static final int DRAWN = 0x00000020; 1568 /** 1569 * When this flag is set, this view is running an animation on behalf of its 1570 * children and should therefore not cancel invalidate requests, even if they 1571 * lie outside of this view's bounds. 1572 * 1573 * {@hide} 1574 */ 1575 static final int DRAW_ANIMATION = 0x00000040; 1576 /** {@hide} */ 1577 static final int SKIP_DRAW = 0x00000080; 1578 /** {@hide} */ 1579 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1580 /** {@hide} */ 1581 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1582 /** {@hide} */ 1583 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1584 /** {@hide} */ 1585 static final int MEASURED_DIMENSION_SET = 0x00000800; 1586 /** {@hide} */ 1587 static final int FORCE_LAYOUT = 0x00001000; 1588 /** {@hide} */ 1589 static final int LAYOUT_REQUIRED = 0x00002000; 1590 1591 private static final int PRESSED = 0x00004000; 1592 1593 /** {@hide} */ 1594 static final int DRAWING_CACHE_VALID = 0x00008000; 1595 /** 1596 * Flag used to indicate that this view should be drawn once more (and only once 1597 * more) after its animation has completed. 1598 * {@hide} 1599 */ 1600 static final int ANIMATION_STARTED = 0x00010000; 1601 1602 private static final int SAVE_STATE_CALLED = 0x00020000; 1603 1604 /** 1605 * Indicates that the View returned true when onSetAlpha() was called and that 1606 * the alpha must be restored. 1607 * {@hide} 1608 */ 1609 static final int ALPHA_SET = 0x00040000; 1610 1611 /** 1612 * Set by {@link #setScrollContainer(boolean)}. 1613 */ 1614 static final int SCROLL_CONTAINER = 0x00080000; 1615 1616 /** 1617 * Set by {@link #setScrollContainer(boolean)}. 1618 */ 1619 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1620 1621 /** 1622 * View flag indicating whether this view was invalidated (fully or partially.) 1623 * 1624 * @hide 1625 */ 1626 static final int DIRTY = 0x00200000; 1627 1628 /** 1629 * View flag indicating whether this view was invalidated by an opaque 1630 * invalidate request. 1631 * 1632 * @hide 1633 */ 1634 static final int DIRTY_OPAQUE = 0x00400000; 1635 1636 /** 1637 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1638 * 1639 * @hide 1640 */ 1641 static final int DIRTY_MASK = 0x00600000; 1642 1643 /** 1644 * Indicates whether the background is opaque. 1645 * 1646 * @hide 1647 */ 1648 static final int OPAQUE_BACKGROUND = 0x00800000; 1649 1650 /** 1651 * Indicates whether the scrollbars are opaque. 1652 * 1653 * @hide 1654 */ 1655 static final int OPAQUE_SCROLLBARS = 0x01000000; 1656 1657 /** 1658 * Indicates whether the view is opaque. 1659 * 1660 * @hide 1661 */ 1662 static final int OPAQUE_MASK = 0x01800000; 1663 1664 /** 1665 * Indicates a prepressed state; 1666 * the short time between ACTION_DOWN and recognizing 1667 * a 'real' press. Prepressed is used to recognize quick taps 1668 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1669 * 1670 * @hide 1671 */ 1672 private static final int PREPRESSED = 0x02000000; 1673 1674 /** 1675 * Indicates whether the view is temporarily detached. 1676 * 1677 * @hide 1678 */ 1679 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1680 1681 /** 1682 * Indicates that we should awaken scroll bars once attached 1683 * 1684 * @hide 1685 */ 1686 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1687 1688 /** 1689 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1690 * @hide 1691 */ 1692 private static final int HOVERED = 0x10000000; 1693 1694 /** 1695 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1696 * for transform operations 1697 * 1698 * @hide 1699 */ 1700 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1701 1702 /** {@hide} */ 1703 static final int ACTIVATED = 0x40000000; 1704 1705 /** 1706 * Indicates that this view was specifically invalidated, not just dirtied because some 1707 * child view was invalidated. The flag is used to determine when we need to recreate 1708 * a view's display list (as opposed to just returning a reference to its existing 1709 * display list). 1710 * 1711 * @hide 1712 */ 1713 static final int INVALIDATED = 0x80000000; 1714 1715 /* Masks for mPrivateFlags2 */ 1716 1717 /** 1718 * Indicates that this view has reported that it can accept the current drag's content. 1719 * Cleared when the drag operation concludes. 1720 * @hide 1721 */ 1722 static final int DRAG_CAN_ACCEPT = 0x00000001; 1723 1724 /** 1725 * Indicates that this view is currently directly under the drag location in a 1726 * drag-and-drop operation involving content that it can accept. Cleared when 1727 * the drag exits the view, or when the drag operation concludes. 1728 * @hide 1729 */ 1730 static final int DRAG_HOVERED = 0x00000002; 1731 1732 /** 1733 * Indicates whether the view is drawn in right-to-left direction. 1734 * 1735 * @hide 1736 */ 1737 static final int RESOLVED_LAYOUT_RTL = 0x00000004; 1738 1739 /* End of masks for mPrivateFlags2 */ 1740 1741 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1742 1743 /** 1744 * Always allow a user to over-scroll this view, provided it is a 1745 * view that can scroll. 1746 * 1747 * @see #getOverScrollMode() 1748 * @see #setOverScrollMode(int) 1749 */ 1750 public static final int OVER_SCROLL_ALWAYS = 0; 1751 1752 /** 1753 * Allow a user to over-scroll this view only if the content is large 1754 * enough to meaningfully scroll, provided it is a view that can scroll. 1755 * 1756 * @see #getOverScrollMode() 1757 * @see #setOverScrollMode(int) 1758 */ 1759 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1760 1761 /** 1762 * Never allow a user to over-scroll this view. 1763 * 1764 * @see #getOverScrollMode() 1765 * @see #setOverScrollMode(int) 1766 */ 1767 public static final int OVER_SCROLL_NEVER = 2; 1768 1769 /** 1770 * View has requested the status bar to be visible (the default). 1771 * 1772 * @see #setSystemUiVisibility(int) 1773 */ 1774 public static final int STATUS_BAR_VISIBLE = 0; 1775 1776 /** 1777 * View has requested the status bar to be hidden. 1778 * 1779 * @see #setSystemUiVisibility(int) 1780 */ 1781 public static final int STATUS_BAR_HIDDEN = 0x00000001; 1782 1783 /** 1784 * @hide 1785 * 1786 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1787 * out of the public fields to keep the undefined bits out of the developer's way. 1788 * 1789 * Flag to make the status bar not expandable. Unless you also 1790 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1791 */ 1792 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1793 1794 /** 1795 * @hide 1796 * 1797 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1798 * out of the public fields to keep the undefined bits out of the developer's way. 1799 * 1800 * Flag to hide notification icons and scrolling ticker text. 1801 */ 1802 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1803 1804 /** 1805 * @hide 1806 * 1807 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1808 * out of the public fields to keep the undefined bits out of the developer's way. 1809 * 1810 * Flag to disable incoming notification alerts. This will not block 1811 * icons, but it will block sound, vibrating and other visual or aural notifications. 1812 */ 1813 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1814 1815 /** 1816 * @hide 1817 * 1818 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1819 * out of the public fields to keep the undefined bits out of the developer's way. 1820 * 1821 * Flag to hide only the scrolling ticker. Note that 1822 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1823 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1824 */ 1825 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1826 1827 /** 1828 * @hide 1829 * 1830 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1831 * out of the public fields to keep the undefined bits out of the developer's way. 1832 * 1833 * Flag to hide the center system info area. 1834 */ 1835 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1836 1837 /** 1838 * @hide 1839 * 1840 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1841 * out of the public fields to keep the undefined bits out of the developer's way. 1842 * 1843 * Flag to hide only the navigation buttons. Don't use this 1844 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1845 * 1846 * THIS DOES NOT DISABLE THE BACK BUTTON 1847 */ 1848 public static final int STATUS_BAR_DISABLE_NAVIGATION = 0x00200000; 1849 1850 /** 1851 * @hide 1852 * 1853 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1854 * out of the public fields to keep the undefined bits out of the developer's way. 1855 * 1856 * Flag to hide only the back button. Don't use this 1857 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1858 */ 1859 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1860 1861 /** 1862 * @hide 1863 * 1864 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1865 * out of the public fields to keep the undefined bits out of the developer's way. 1866 * 1867 * Flag to hide only the clock. You might use this if your activity has 1868 * its own clock making the status bar's clock redundant. 1869 */ 1870 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1871 1872 /** 1873 * @hide 1874 */ 1875 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = STATUS_BAR_HIDDEN; 1876 1877 /** 1878 * Controls the over-scroll mode for this view. 1879 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1880 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1881 * and {@link #OVER_SCROLL_NEVER}. 1882 */ 1883 private int mOverScrollMode; 1884 1885 /** 1886 * The parent this view is attached to. 1887 * {@hide} 1888 * 1889 * @see #getParent() 1890 */ 1891 protected ViewParent mParent; 1892 1893 /** 1894 * {@hide} 1895 */ 1896 AttachInfo mAttachInfo; 1897 1898 /** 1899 * {@hide} 1900 */ 1901 @ViewDebug.ExportedProperty(flagMapping = { 1902 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1903 name = "FORCE_LAYOUT"), 1904 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1905 name = "LAYOUT_REQUIRED"), 1906 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1907 name = "DRAWING_CACHE_INVALID", outputIf = false), 1908 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1909 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1910 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1911 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1912 }) 1913 int mPrivateFlags; 1914 int mPrivateFlags2; 1915 1916 /** 1917 * This view's request for the visibility of the status bar. 1918 * @hide 1919 */ 1920 @ViewDebug.ExportedProperty() 1921 int mSystemUiVisibility; 1922 1923 /** 1924 * Count of how many windows this view has been attached to. 1925 */ 1926 int mWindowAttachCount; 1927 1928 /** 1929 * The layout parameters associated with this view and used by the parent 1930 * {@link android.view.ViewGroup} to determine how this view should be 1931 * laid out. 1932 * {@hide} 1933 */ 1934 protected ViewGroup.LayoutParams mLayoutParams; 1935 1936 /** 1937 * The view flags hold various views states. 1938 * {@hide} 1939 */ 1940 @ViewDebug.ExportedProperty 1941 int mViewFlags; 1942 1943 /** 1944 * The transform matrix for the View. This transform is calculated internally 1945 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1946 * is used by default. Do *not* use this variable directly; instead call 1947 * getMatrix(), which will automatically recalculate the matrix if necessary 1948 * to get the correct matrix based on the latest rotation and scale properties. 1949 */ 1950 private final Matrix mMatrix = new Matrix(); 1951 1952 /** 1953 * The transform matrix for the View. This transform is calculated internally 1954 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1955 * is used by default. Do *not* use this variable directly; instead call 1956 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1957 * to get the correct matrix based on the latest rotation and scale properties. 1958 */ 1959 private Matrix mInverseMatrix; 1960 1961 /** 1962 * An internal variable that tracks whether we need to recalculate the 1963 * transform matrix, based on whether the rotation or scaleX/Y properties 1964 * have changed since the matrix was last calculated. 1965 */ 1966 boolean mMatrixDirty = false; 1967 1968 /** 1969 * An internal variable that tracks whether we need to recalculate the 1970 * transform matrix, based on whether the rotation or scaleX/Y properties 1971 * have changed since the matrix was last calculated. 1972 */ 1973 private boolean mInverseMatrixDirty = true; 1974 1975 /** 1976 * A variable that tracks whether we need to recalculate the 1977 * transform matrix, based on whether the rotation or scaleX/Y properties 1978 * have changed since the matrix was last calculated. This variable 1979 * is only valid after a call to updateMatrix() or to a function that 1980 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1981 */ 1982 private boolean mMatrixIsIdentity = true; 1983 1984 /** 1985 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1986 */ 1987 private Camera mCamera = null; 1988 1989 /** 1990 * This matrix is used when computing the matrix for 3D rotations. 1991 */ 1992 private Matrix matrix3D = null; 1993 1994 /** 1995 * These prev values are used to recalculate a centered pivot point when necessary. The 1996 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1997 * set), so thes values are only used then as well. 1998 */ 1999 private int mPrevWidth = -1; 2000 private int mPrevHeight = -1; 2001 2002 private boolean mLastIsOpaque; 2003 2004 /** 2005 * Convenience value to check for float values that are close enough to zero to be considered 2006 * zero. 2007 */ 2008 private static final float NONZERO_EPSILON = .001f; 2009 2010 /** 2011 * The degrees rotation around the vertical axis through the pivot point. 2012 */ 2013 @ViewDebug.ExportedProperty 2014 float mRotationY = 0f; 2015 2016 /** 2017 * The degrees rotation around the horizontal axis through the pivot point. 2018 */ 2019 @ViewDebug.ExportedProperty 2020 float mRotationX = 0f; 2021 2022 /** 2023 * The degrees rotation around the pivot point. 2024 */ 2025 @ViewDebug.ExportedProperty 2026 float mRotation = 0f; 2027 2028 /** 2029 * The amount of translation of the object away from its left property (post-layout). 2030 */ 2031 @ViewDebug.ExportedProperty 2032 float mTranslationX = 0f; 2033 2034 /** 2035 * The amount of translation of the object away from its top property (post-layout). 2036 */ 2037 @ViewDebug.ExportedProperty 2038 float mTranslationY = 0f; 2039 2040 /** 2041 * The amount of scale in the x direction around the pivot point. A 2042 * value of 1 means no scaling is applied. 2043 */ 2044 @ViewDebug.ExportedProperty 2045 float mScaleX = 1f; 2046 2047 /** 2048 * The amount of scale in the y direction around the pivot point. A 2049 * value of 1 means no scaling is applied. 2050 */ 2051 @ViewDebug.ExportedProperty 2052 float mScaleY = 1f; 2053 2054 /** 2055 * The amount of scale in the x direction around the pivot point. A 2056 * value of 1 means no scaling is applied. 2057 */ 2058 @ViewDebug.ExportedProperty 2059 float mPivotX = 0f; 2060 2061 /** 2062 * The amount of scale in the y direction around the pivot point. A 2063 * value of 1 means no scaling is applied. 2064 */ 2065 @ViewDebug.ExportedProperty 2066 float mPivotY = 0f; 2067 2068 /** 2069 * The opacity of the View. This is a value from 0 to 1, where 0 means 2070 * completely transparent and 1 means completely opaque. 2071 */ 2072 @ViewDebug.ExportedProperty 2073 float mAlpha = 1f; 2074 2075 /** 2076 * The distance in pixels from the left edge of this view's parent 2077 * to the left edge of this view. 2078 * {@hide} 2079 */ 2080 @ViewDebug.ExportedProperty(category = "layout") 2081 protected int mLeft; 2082 /** 2083 * The distance in pixels from the left edge of this view's parent 2084 * to the right edge of this view. 2085 * {@hide} 2086 */ 2087 @ViewDebug.ExportedProperty(category = "layout") 2088 protected int mRight; 2089 /** 2090 * The distance in pixels from the top edge of this view's parent 2091 * to the top edge of this view. 2092 * {@hide} 2093 */ 2094 @ViewDebug.ExportedProperty(category = "layout") 2095 protected int mTop; 2096 /** 2097 * The distance in pixels from the top edge of this view's parent 2098 * to the bottom edge of this view. 2099 * {@hide} 2100 */ 2101 @ViewDebug.ExportedProperty(category = "layout") 2102 protected int mBottom; 2103 2104 /** 2105 * The offset, in pixels, by which the content of this view is scrolled 2106 * horizontally. 2107 * {@hide} 2108 */ 2109 @ViewDebug.ExportedProperty(category = "scrolling") 2110 protected int mScrollX; 2111 /** 2112 * The offset, in pixels, by which the content of this view is scrolled 2113 * vertically. 2114 * {@hide} 2115 */ 2116 @ViewDebug.ExportedProperty(category = "scrolling") 2117 protected int mScrollY; 2118 2119 /** 2120 * The left padding in pixels, that is the distance in pixels between the 2121 * left edge of this view and the left edge of its content. 2122 * {@hide} 2123 */ 2124 @ViewDebug.ExportedProperty(category = "padding") 2125 protected int mPaddingLeft; 2126 /** 2127 * The right padding in pixels, that is the distance in pixels between the 2128 * right edge of this view and the right edge of its content. 2129 * {@hide} 2130 */ 2131 @ViewDebug.ExportedProperty(category = "padding") 2132 protected int mPaddingRight; 2133 /** 2134 * The top padding in pixels, that is the distance in pixels between the 2135 * top edge of this view and the top edge of its content. 2136 * {@hide} 2137 */ 2138 @ViewDebug.ExportedProperty(category = "padding") 2139 protected int mPaddingTop; 2140 /** 2141 * The bottom padding in pixels, that is the distance in pixels between the 2142 * bottom edge of this view and the bottom edge of its content. 2143 * {@hide} 2144 */ 2145 @ViewDebug.ExportedProperty(category = "padding") 2146 protected int mPaddingBottom; 2147 2148 /** 2149 * Briefly describes the view and is primarily used for accessibility support. 2150 */ 2151 private CharSequence mContentDescription; 2152 2153 /** 2154 * Cache the paddingRight set by the user to append to the scrollbar's size. 2155 */ 2156 @ViewDebug.ExportedProperty(category = "padding") 2157 int mUserPaddingRight; 2158 2159 /** 2160 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2161 */ 2162 @ViewDebug.ExportedProperty(category = "padding") 2163 int mUserPaddingBottom; 2164 2165 /** 2166 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2167 */ 2168 @ViewDebug.ExportedProperty(category = "padding") 2169 int mUserPaddingLeft; 2170 2171 /** 2172 * @hide 2173 */ 2174 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2175 /** 2176 * @hide 2177 */ 2178 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2179 2180 private Resources mResources = null; 2181 2182 private Drawable mBGDrawable; 2183 2184 private int mBackgroundResource; 2185 private boolean mBackgroundSizeChanged; 2186 2187 /** 2188 * Listener used to dispatch focus change events. 2189 * This field should be made private, so it is hidden from the SDK. 2190 * {@hide} 2191 */ 2192 protected OnFocusChangeListener mOnFocusChangeListener; 2193 2194 /** 2195 * Listeners for layout change events. 2196 */ 2197 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2198 2199 /** 2200 * Listeners for attach events. 2201 */ 2202 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2203 2204 /** 2205 * Listener used to dispatch click events. 2206 * This field should be made private, so it is hidden from the SDK. 2207 * {@hide} 2208 */ 2209 protected OnClickListener mOnClickListener; 2210 2211 /** 2212 * Listener used to dispatch long click events. 2213 * This field should be made private, so it is hidden from the SDK. 2214 * {@hide} 2215 */ 2216 protected OnLongClickListener mOnLongClickListener; 2217 2218 /** 2219 * Listener used to build the context menu. 2220 * This field should be made private, so it is hidden from the SDK. 2221 * {@hide} 2222 */ 2223 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2224 2225 private OnKeyListener mOnKeyListener; 2226 2227 private OnTouchListener mOnTouchListener; 2228 2229 private OnGenericMotionListener mOnGenericMotionListener; 2230 2231 private OnDragListener mOnDragListener; 2232 2233 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2234 2235 /** 2236 * The application environment this view lives in. 2237 * This field should be made private, so it is hidden from the SDK. 2238 * {@hide} 2239 */ 2240 protected Context mContext; 2241 2242 private ScrollabilityCache mScrollCache; 2243 2244 private int[] mDrawableState = null; 2245 2246 /** 2247 * Set to true when drawing cache is enabled and cannot be created. 2248 * 2249 * @hide 2250 */ 2251 public boolean mCachingFailed; 2252 2253 private Bitmap mDrawingCache; 2254 private Bitmap mUnscaledDrawingCache; 2255 private DisplayList mDisplayList; 2256 private HardwareLayer mHardwareLayer; 2257 2258 /** 2259 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2260 * the user may specify which view to go to next. 2261 */ 2262 private int mNextFocusLeftId = View.NO_ID; 2263 2264 /** 2265 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2266 * the user may specify which view to go to next. 2267 */ 2268 private int mNextFocusRightId = View.NO_ID; 2269 2270 /** 2271 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2272 * the user may specify which view to go to next. 2273 */ 2274 private int mNextFocusUpId = View.NO_ID; 2275 2276 /** 2277 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2278 * the user may specify which view to go to next. 2279 */ 2280 private int mNextFocusDownId = View.NO_ID; 2281 2282 /** 2283 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2284 * the user may specify which view to go to next. 2285 */ 2286 int mNextFocusForwardId = View.NO_ID; 2287 2288 private CheckForLongPress mPendingCheckForLongPress; 2289 private CheckForTap mPendingCheckForTap = null; 2290 private PerformClick mPerformClick; 2291 2292 private UnsetPressedState mUnsetPressedState; 2293 2294 /** 2295 * Whether the long press's action has been invoked. The tap's action is invoked on the 2296 * up event while a long press is invoked as soon as the long press duration is reached, so 2297 * a long press could be performed before the tap is checked, in which case the tap's action 2298 * should not be invoked. 2299 */ 2300 private boolean mHasPerformedLongPress; 2301 2302 /** 2303 * The minimum height of the view. We'll try our best to have the height 2304 * of this view to at least this amount. 2305 */ 2306 @ViewDebug.ExportedProperty(category = "measurement") 2307 private int mMinHeight; 2308 2309 /** 2310 * The minimum width of the view. We'll try our best to have the width 2311 * of this view to at least this amount. 2312 */ 2313 @ViewDebug.ExportedProperty(category = "measurement") 2314 private int mMinWidth; 2315 2316 /** 2317 * The delegate to handle touch events that are physically in this view 2318 * but should be handled by another view. 2319 */ 2320 private TouchDelegate mTouchDelegate = null; 2321 2322 /** 2323 * Solid color to use as a background when creating the drawing cache. Enables 2324 * the cache to use 16 bit bitmaps instead of 32 bit. 2325 */ 2326 private int mDrawingCacheBackgroundColor = 0; 2327 2328 /** 2329 * Special tree observer used when mAttachInfo is null. 2330 */ 2331 private ViewTreeObserver mFloatingTreeObserver; 2332 2333 /** 2334 * Cache the touch slop from the context that created the view. 2335 */ 2336 private int mTouchSlop; 2337 2338 /** 2339 * Object that handles automatic animation of view properties. 2340 */ 2341 private ViewPropertyAnimator mAnimator = null; 2342 2343 /** 2344 * Flag indicating that a drag can cross window boundaries. When 2345 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2346 * with this flag set, all visible applications will be able to participate 2347 * in the drag operation and receive the dragged content. 2348 * 2349 * @hide 2350 */ 2351 public static final int DRAG_FLAG_GLOBAL = 1; 2352 2353 /** 2354 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2355 */ 2356 private float mVerticalScrollFactor; 2357 2358 /** 2359 * Position of the vertical scroll bar. 2360 */ 2361 private int mVerticalScrollbarPosition; 2362 2363 /** 2364 * Position the scroll bar at the default position as determined by the system. 2365 */ 2366 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2367 2368 /** 2369 * Position the scroll bar along the left edge. 2370 */ 2371 public static final int SCROLLBAR_POSITION_LEFT = 1; 2372 2373 /** 2374 * Position the scroll bar along the right edge. 2375 */ 2376 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2377 2378 /** 2379 * Indicates that the view does not have a layer. 2380 * 2381 * @see #getLayerType() 2382 * @see #setLayerType(int, android.graphics.Paint) 2383 * @see #LAYER_TYPE_SOFTWARE 2384 * @see #LAYER_TYPE_HARDWARE 2385 */ 2386 public static final int LAYER_TYPE_NONE = 0; 2387 2388 /** 2389 * <p>Indicates that the view has a software layer. A software layer is backed 2390 * by a bitmap and causes the view to be rendered using Android's software 2391 * rendering pipeline, even if hardware acceleration is enabled.</p> 2392 * 2393 * <p>Software layers have various usages:</p> 2394 * <p>When the application is not using hardware acceleration, a software layer 2395 * is useful to apply a specific color filter and/or blending mode and/or 2396 * translucency to a view and all its children.</p> 2397 * <p>When the application is using hardware acceleration, a software layer 2398 * is useful to render drawing primitives not supported by the hardware 2399 * accelerated pipeline. It can also be used to cache a complex view tree 2400 * into a texture and reduce the complexity of drawing operations. For instance, 2401 * when animating a complex view tree with a translation, a software layer can 2402 * be used to render the view tree only once.</p> 2403 * <p>Software layers should be avoided when the affected view tree updates 2404 * often. Every update will require to re-render the software layer, which can 2405 * potentially be slow (particularly when hardware acceleration is turned on 2406 * since the layer will have to be uploaded into a hardware texture after every 2407 * update.)</p> 2408 * 2409 * @see #getLayerType() 2410 * @see #setLayerType(int, android.graphics.Paint) 2411 * @see #LAYER_TYPE_NONE 2412 * @see #LAYER_TYPE_HARDWARE 2413 */ 2414 public static final int LAYER_TYPE_SOFTWARE = 1; 2415 2416 /** 2417 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2418 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2419 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2420 * rendering pipeline, but only if hardware acceleration is turned on for the 2421 * view hierarchy. When hardware acceleration is turned off, hardware layers 2422 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2423 * 2424 * <p>A hardware layer is useful to apply a specific color filter and/or 2425 * blending mode and/or translucency to a view and all its children.</p> 2426 * <p>A hardware layer can be used to cache a complex view tree into a 2427 * texture and reduce the complexity of drawing operations. For instance, 2428 * when animating a complex view tree with a translation, a hardware layer can 2429 * be used to render the view tree only once.</p> 2430 * <p>A hardware layer can also be used to increase the rendering quality when 2431 * rotation transformations are applied on a view. It can also be used to 2432 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2433 * 2434 * @see #getLayerType() 2435 * @see #setLayerType(int, android.graphics.Paint) 2436 * @see #LAYER_TYPE_NONE 2437 * @see #LAYER_TYPE_SOFTWARE 2438 */ 2439 public static final int LAYER_TYPE_HARDWARE = 2; 2440 2441 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2442 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2443 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2444 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2445 }) 2446 int mLayerType = LAYER_TYPE_NONE; 2447 Paint mLayerPaint; 2448 Rect mLocalDirtyRect; 2449 2450 /** 2451 * Consistency verifier for debugging purposes. 2452 * @hide 2453 */ 2454 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2455 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2456 new InputEventConsistencyVerifier(this, 0) : null; 2457 2458 /** 2459 * Simple constructor to use when creating a view from code. 2460 * 2461 * @param context The Context the view is running in, through which it can 2462 * access the current theme, resources, etc. 2463 */ 2464 public View(Context context) { 2465 mContext = context; 2466 mResources = context != null ? context.getResources() : null; 2467 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT; 2468 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2469 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2470 } 2471 2472 /** 2473 * Constructor that is called when inflating a view from XML. This is called 2474 * when a view is being constructed from an XML file, supplying attributes 2475 * that were specified in the XML file. This version uses a default style of 2476 * 0, so the only attribute values applied are those in the Context's Theme 2477 * and the given AttributeSet. 2478 * 2479 * <p> 2480 * The method onFinishInflate() will be called after all children have been 2481 * added. 2482 * 2483 * @param context The Context the view is running in, through which it can 2484 * access the current theme, resources, etc. 2485 * @param attrs The attributes of the XML tag that is inflating the view. 2486 * @see #View(Context, AttributeSet, int) 2487 */ 2488 public View(Context context, AttributeSet attrs) { 2489 this(context, attrs, 0); 2490 } 2491 2492 /** 2493 * Perform inflation from XML and apply a class-specific base style. This 2494 * constructor of View allows subclasses to use their own base style when 2495 * they are inflating. For example, a Button class's constructor would call 2496 * this version of the super class constructor and supply 2497 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2498 * the theme's button style to modify all of the base view attributes (in 2499 * particular its background) as well as the Button class's attributes. 2500 * 2501 * @param context The Context the view is running in, through which it can 2502 * access the current theme, resources, etc. 2503 * @param attrs The attributes of the XML tag that is inflating the view. 2504 * @param defStyle The default style to apply to this view. If 0, no style 2505 * will be applied (beyond what is included in the theme). This may 2506 * either be an attribute resource, whose value will be retrieved 2507 * from the current theme, or an explicit style resource. 2508 * @see #View(Context, AttributeSet) 2509 */ 2510 public View(Context context, AttributeSet attrs, int defStyle) { 2511 this(context); 2512 2513 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2514 defStyle, 0); 2515 2516 Drawable background = null; 2517 2518 int leftPadding = -1; 2519 int topPadding = -1; 2520 int rightPadding = -1; 2521 int bottomPadding = -1; 2522 2523 int padding = -1; 2524 2525 int viewFlagValues = 0; 2526 int viewFlagMasks = 0; 2527 2528 boolean setScrollContainer = false; 2529 2530 int x = 0; 2531 int y = 0; 2532 2533 float tx = 0; 2534 float ty = 0; 2535 float rotation = 0; 2536 float rotationX = 0; 2537 float rotationY = 0; 2538 float sx = 1f; 2539 float sy = 1f; 2540 boolean transformSet = false; 2541 2542 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2543 2544 int overScrollMode = mOverScrollMode; 2545 final int N = a.getIndexCount(); 2546 for (int i = 0; i < N; i++) { 2547 int attr = a.getIndex(i); 2548 switch (attr) { 2549 case com.android.internal.R.styleable.View_background: 2550 background = a.getDrawable(attr); 2551 break; 2552 case com.android.internal.R.styleable.View_padding: 2553 padding = a.getDimensionPixelSize(attr, -1); 2554 break; 2555 case com.android.internal.R.styleable.View_paddingLeft: 2556 leftPadding = a.getDimensionPixelSize(attr, -1); 2557 break; 2558 case com.android.internal.R.styleable.View_paddingTop: 2559 topPadding = a.getDimensionPixelSize(attr, -1); 2560 break; 2561 case com.android.internal.R.styleable.View_paddingRight: 2562 rightPadding = a.getDimensionPixelSize(attr, -1); 2563 break; 2564 case com.android.internal.R.styleable.View_paddingBottom: 2565 bottomPadding = a.getDimensionPixelSize(attr, -1); 2566 break; 2567 case com.android.internal.R.styleable.View_scrollX: 2568 x = a.getDimensionPixelOffset(attr, 0); 2569 break; 2570 case com.android.internal.R.styleable.View_scrollY: 2571 y = a.getDimensionPixelOffset(attr, 0); 2572 break; 2573 case com.android.internal.R.styleable.View_alpha: 2574 setAlpha(a.getFloat(attr, 1f)); 2575 break; 2576 case com.android.internal.R.styleable.View_transformPivotX: 2577 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2578 break; 2579 case com.android.internal.R.styleable.View_transformPivotY: 2580 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2581 break; 2582 case com.android.internal.R.styleable.View_translationX: 2583 tx = a.getDimensionPixelOffset(attr, 0); 2584 transformSet = true; 2585 break; 2586 case com.android.internal.R.styleable.View_translationY: 2587 ty = a.getDimensionPixelOffset(attr, 0); 2588 transformSet = true; 2589 break; 2590 case com.android.internal.R.styleable.View_rotation: 2591 rotation = a.getFloat(attr, 0); 2592 transformSet = true; 2593 break; 2594 case com.android.internal.R.styleable.View_rotationX: 2595 rotationX = a.getFloat(attr, 0); 2596 transformSet = true; 2597 break; 2598 case com.android.internal.R.styleable.View_rotationY: 2599 rotationY = a.getFloat(attr, 0); 2600 transformSet = true; 2601 break; 2602 case com.android.internal.R.styleable.View_scaleX: 2603 sx = a.getFloat(attr, 1f); 2604 transformSet = true; 2605 break; 2606 case com.android.internal.R.styleable.View_scaleY: 2607 sy = a.getFloat(attr, 1f); 2608 transformSet = true; 2609 break; 2610 case com.android.internal.R.styleable.View_id: 2611 mID = a.getResourceId(attr, NO_ID); 2612 break; 2613 case com.android.internal.R.styleable.View_tag: 2614 mTag = a.getText(attr); 2615 break; 2616 case com.android.internal.R.styleable.View_fitsSystemWindows: 2617 if (a.getBoolean(attr, false)) { 2618 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2619 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2620 } 2621 break; 2622 case com.android.internal.R.styleable.View_focusable: 2623 if (a.getBoolean(attr, false)) { 2624 viewFlagValues |= FOCUSABLE; 2625 viewFlagMasks |= FOCUSABLE_MASK; 2626 } 2627 break; 2628 case com.android.internal.R.styleable.View_focusableInTouchMode: 2629 if (a.getBoolean(attr, false)) { 2630 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2631 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2632 } 2633 break; 2634 case com.android.internal.R.styleable.View_clickable: 2635 if (a.getBoolean(attr, false)) { 2636 viewFlagValues |= CLICKABLE; 2637 viewFlagMasks |= CLICKABLE; 2638 } 2639 break; 2640 case com.android.internal.R.styleable.View_longClickable: 2641 if (a.getBoolean(attr, false)) { 2642 viewFlagValues |= LONG_CLICKABLE; 2643 viewFlagMasks |= LONG_CLICKABLE; 2644 } 2645 break; 2646 case com.android.internal.R.styleable.View_saveEnabled: 2647 if (!a.getBoolean(attr, true)) { 2648 viewFlagValues |= SAVE_DISABLED; 2649 viewFlagMasks |= SAVE_DISABLED_MASK; 2650 } 2651 break; 2652 case com.android.internal.R.styleable.View_duplicateParentState: 2653 if (a.getBoolean(attr, false)) { 2654 viewFlagValues |= DUPLICATE_PARENT_STATE; 2655 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2656 } 2657 break; 2658 case com.android.internal.R.styleable.View_visibility: 2659 final int visibility = a.getInt(attr, 0); 2660 if (visibility != 0) { 2661 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2662 viewFlagMasks |= VISIBILITY_MASK; 2663 } 2664 break; 2665 case com.android.internal.R.styleable.View_layoutDirection: 2666 // Clear any HORIZONTAL_DIRECTION flag already set 2667 viewFlagValues &= ~LAYOUT_DIRECTION_MASK; 2668 // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute 2669 final int layoutDirection = a.getInt(attr, -1); 2670 if (layoutDirection != -1) { 2671 viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection]; 2672 } else { 2673 // Set to default (LAYOUT_DIRECTION_INHERIT) 2674 viewFlagValues |= LAYOUT_DIRECTION_DEFAULT; 2675 } 2676 viewFlagMasks |= LAYOUT_DIRECTION_MASK; 2677 break; 2678 case com.android.internal.R.styleable.View_drawingCacheQuality: 2679 final int cacheQuality = a.getInt(attr, 0); 2680 if (cacheQuality != 0) { 2681 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2682 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2683 } 2684 break; 2685 case com.android.internal.R.styleable.View_contentDescription: 2686 mContentDescription = a.getString(attr); 2687 break; 2688 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2689 if (!a.getBoolean(attr, true)) { 2690 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2691 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2692 } 2693 break; 2694 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2695 if (!a.getBoolean(attr, true)) { 2696 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2697 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2698 } 2699 break; 2700 case R.styleable.View_scrollbars: 2701 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2702 if (scrollbars != SCROLLBARS_NONE) { 2703 viewFlagValues |= scrollbars; 2704 viewFlagMasks |= SCROLLBARS_MASK; 2705 initializeScrollbars(a); 2706 } 2707 break; 2708 case R.styleable.View_fadingEdge: 2709 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2710 if (fadingEdge != FADING_EDGE_NONE) { 2711 viewFlagValues |= fadingEdge; 2712 viewFlagMasks |= FADING_EDGE_MASK; 2713 initializeFadingEdge(a); 2714 } 2715 break; 2716 case R.styleable.View_scrollbarStyle: 2717 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2718 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2719 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2720 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2721 } 2722 break; 2723 case R.styleable.View_isScrollContainer: 2724 setScrollContainer = true; 2725 if (a.getBoolean(attr, false)) { 2726 setScrollContainer(true); 2727 } 2728 break; 2729 case com.android.internal.R.styleable.View_keepScreenOn: 2730 if (a.getBoolean(attr, false)) { 2731 viewFlagValues |= KEEP_SCREEN_ON; 2732 viewFlagMasks |= KEEP_SCREEN_ON; 2733 } 2734 break; 2735 case R.styleable.View_filterTouchesWhenObscured: 2736 if (a.getBoolean(attr, false)) { 2737 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2738 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2739 } 2740 break; 2741 case R.styleable.View_nextFocusLeft: 2742 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2743 break; 2744 case R.styleable.View_nextFocusRight: 2745 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2746 break; 2747 case R.styleable.View_nextFocusUp: 2748 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2749 break; 2750 case R.styleable.View_nextFocusDown: 2751 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2752 break; 2753 case R.styleable.View_nextFocusForward: 2754 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2755 break; 2756 case R.styleable.View_minWidth: 2757 mMinWidth = a.getDimensionPixelSize(attr, 0); 2758 break; 2759 case R.styleable.View_minHeight: 2760 mMinHeight = a.getDimensionPixelSize(attr, 0); 2761 break; 2762 case R.styleable.View_onClick: 2763 if (context.isRestricted()) { 2764 throw new IllegalStateException("The android:onClick attribute cannot " 2765 + "be used within a restricted context"); 2766 } 2767 2768 final String handlerName = a.getString(attr); 2769 if (handlerName != null) { 2770 setOnClickListener(new OnClickListener() { 2771 private Method mHandler; 2772 2773 public void onClick(View v) { 2774 if (mHandler == null) { 2775 try { 2776 mHandler = getContext().getClass().getMethod(handlerName, 2777 View.class); 2778 } catch (NoSuchMethodException e) { 2779 int id = getId(); 2780 String idText = id == NO_ID ? "" : " with id '" 2781 + getContext().getResources().getResourceEntryName( 2782 id) + "'"; 2783 throw new IllegalStateException("Could not find a method " + 2784 handlerName + "(View) in the activity " 2785 + getContext().getClass() + " for onClick handler" 2786 + " on view " + View.this.getClass() + idText, e); 2787 } 2788 } 2789 2790 try { 2791 mHandler.invoke(getContext(), View.this); 2792 } catch (IllegalAccessException e) { 2793 throw new IllegalStateException("Could not execute non " 2794 + "public method of the activity", e); 2795 } catch (InvocationTargetException e) { 2796 throw new IllegalStateException("Could not execute " 2797 + "method of the activity", e); 2798 } 2799 } 2800 }); 2801 } 2802 break; 2803 case R.styleable.View_overScrollMode: 2804 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2805 break; 2806 case R.styleable.View_verticalScrollbarPosition: 2807 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2808 break; 2809 case R.styleable.View_layerType: 2810 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2811 break; 2812 } 2813 } 2814 2815 setOverScrollMode(overScrollMode); 2816 2817 if (background != null) { 2818 setBackgroundDrawable(background); 2819 } 2820 2821 if (padding >= 0) { 2822 leftPadding = padding; 2823 topPadding = padding; 2824 rightPadding = padding; 2825 bottomPadding = padding; 2826 } 2827 2828 // If the user specified the padding (either with android:padding or 2829 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2830 // use the default padding or the padding from the background drawable 2831 // (stored at this point in mPadding*) 2832 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2833 topPadding >= 0 ? topPadding : mPaddingTop, 2834 rightPadding >= 0 ? rightPadding : mPaddingRight, 2835 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2836 2837 if (viewFlagMasks != 0) { 2838 setFlags(viewFlagValues, viewFlagMasks); 2839 } 2840 2841 // Needs to be called after mViewFlags is set 2842 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2843 recomputePadding(); 2844 } 2845 2846 if (x != 0 || y != 0) { 2847 scrollTo(x, y); 2848 } 2849 2850 if (transformSet) { 2851 setTranslationX(tx); 2852 setTranslationY(ty); 2853 setRotation(rotation); 2854 setRotationX(rotationX); 2855 setRotationY(rotationY); 2856 setScaleX(sx); 2857 setScaleY(sy); 2858 } 2859 2860 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2861 setScrollContainer(true); 2862 } 2863 2864 computeOpaqueFlags(); 2865 2866 a.recycle(); 2867 } 2868 2869 /** 2870 * Non-public constructor for use in testing 2871 */ 2872 View() { 2873 } 2874 2875 /** 2876 * <p> 2877 * Initializes the fading edges from a given set of styled attributes. This 2878 * method should be called by subclasses that need fading edges and when an 2879 * instance of these subclasses is created programmatically rather than 2880 * being inflated from XML. This method is automatically called when the XML 2881 * is inflated. 2882 * </p> 2883 * 2884 * @param a the styled attributes set to initialize the fading edges from 2885 */ 2886 protected void initializeFadingEdge(TypedArray a) { 2887 initScrollCache(); 2888 2889 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2890 R.styleable.View_fadingEdgeLength, 2891 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2892 } 2893 2894 /** 2895 * Returns the size of the vertical faded edges used to indicate that more 2896 * content in this view is visible. 2897 * 2898 * @return The size in pixels of the vertical faded edge or 0 if vertical 2899 * faded edges are not enabled for this view. 2900 * @attr ref android.R.styleable#View_fadingEdgeLength 2901 */ 2902 public int getVerticalFadingEdgeLength() { 2903 if (isVerticalFadingEdgeEnabled()) { 2904 ScrollabilityCache cache = mScrollCache; 2905 if (cache != null) { 2906 return cache.fadingEdgeLength; 2907 } 2908 } 2909 return 0; 2910 } 2911 2912 /** 2913 * Set the size of the faded edge used to indicate that more content in this 2914 * view is available. Will not change whether the fading edge is enabled; use 2915 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 2916 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 2917 * for the vertical or horizontal fading edges. 2918 * 2919 * @param length The size in pixels of the faded edge used to indicate that more 2920 * content in this view is visible. 2921 */ 2922 public void setFadingEdgeLength(int length) { 2923 initScrollCache(); 2924 mScrollCache.fadingEdgeLength = length; 2925 } 2926 2927 /** 2928 * Returns the size of the horizontal faded edges used to indicate that more 2929 * content in this view is visible. 2930 * 2931 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2932 * faded edges are not enabled for this view. 2933 * @attr ref android.R.styleable#View_fadingEdgeLength 2934 */ 2935 public int getHorizontalFadingEdgeLength() { 2936 if (isHorizontalFadingEdgeEnabled()) { 2937 ScrollabilityCache cache = mScrollCache; 2938 if (cache != null) { 2939 return cache.fadingEdgeLength; 2940 } 2941 } 2942 return 0; 2943 } 2944 2945 /** 2946 * Returns the width of the vertical scrollbar. 2947 * 2948 * @return The width in pixels of the vertical scrollbar or 0 if there 2949 * is no vertical scrollbar. 2950 */ 2951 public int getVerticalScrollbarWidth() { 2952 ScrollabilityCache cache = mScrollCache; 2953 if (cache != null) { 2954 ScrollBarDrawable scrollBar = cache.scrollBar; 2955 if (scrollBar != null) { 2956 int size = scrollBar.getSize(true); 2957 if (size <= 0) { 2958 size = cache.scrollBarSize; 2959 } 2960 return size; 2961 } 2962 return 0; 2963 } 2964 return 0; 2965 } 2966 2967 /** 2968 * Returns the height of the horizontal scrollbar. 2969 * 2970 * @return The height in pixels of the horizontal scrollbar or 0 if 2971 * there is no horizontal scrollbar. 2972 */ 2973 protected int getHorizontalScrollbarHeight() { 2974 ScrollabilityCache cache = mScrollCache; 2975 if (cache != null) { 2976 ScrollBarDrawable scrollBar = cache.scrollBar; 2977 if (scrollBar != null) { 2978 int size = scrollBar.getSize(false); 2979 if (size <= 0) { 2980 size = cache.scrollBarSize; 2981 } 2982 return size; 2983 } 2984 return 0; 2985 } 2986 return 0; 2987 } 2988 2989 /** 2990 * <p> 2991 * Initializes the scrollbars from a given set of styled attributes. This 2992 * method should be called by subclasses that need scrollbars and when an 2993 * instance of these subclasses is created programmatically rather than 2994 * being inflated from XML. This method is automatically called when the XML 2995 * is inflated. 2996 * </p> 2997 * 2998 * @param a the styled attributes set to initialize the scrollbars from 2999 */ 3000 protected void initializeScrollbars(TypedArray a) { 3001 initScrollCache(); 3002 3003 final ScrollabilityCache scrollabilityCache = mScrollCache; 3004 3005 if (scrollabilityCache.scrollBar == null) { 3006 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3007 } 3008 3009 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3010 3011 if (!fadeScrollbars) { 3012 scrollabilityCache.state = ScrollabilityCache.ON; 3013 } 3014 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3015 3016 3017 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3018 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3019 .getScrollBarFadeDuration()); 3020 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3021 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3022 ViewConfiguration.getScrollDefaultDelay()); 3023 3024 3025 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3026 com.android.internal.R.styleable.View_scrollbarSize, 3027 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3028 3029 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3030 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3031 3032 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3033 if (thumb != null) { 3034 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3035 } 3036 3037 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3038 false); 3039 if (alwaysDraw) { 3040 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3041 } 3042 3043 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3044 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3045 3046 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3047 if (thumb != null) { 3048 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3049 } 3050 3051 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3052 false); 3053 if (alwaysDraw) { 3054 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3055 } 3056 3057 // Re-apply user/background padding so that scrollbar(s) get added 3058 recomputePadding(); 3059 } 3060 3061 /** 3062 * <p> 3063 * Initalizes the scrollability cache if necessary. 3064 * </p> 3065 */ 3066 private void initScrollCache() { 3067 if (mScrollCache == null) { 3068 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3069 } 3070 } 3071 3072 /** 3073 * Set the position of the vertical scroll bar. Should be one of 3074 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3075 * {@link #SCROLLBAR_POSITION_RIGHT}. 3076 * 3077 * @param position Where the vertical scroll bar should be positioned. 3078 */ 3079 public void setVerticalScrollbarPosition(int position) { 3080 if (mVerticalScrollbarPosition != position) { 3081 mVerticalScrollbarPosition = position; 3082 computeOpaqueFlags(); 3083 recomputePadding(); 3084 } 3085 } 3086 3087 /** 3088 * @return The position where the vertical scroll bar will show, if applicable. 3089 * @see #setVerticalScrollbarPosition(int) 3090 */ 3091 public int getVerticalScrollbarPosition() { 3092 return mVerticalScrollbarPosition; 3093 } 3094 3095 /** 3096 * Register a callback to be invoked when focus of this view changed. 3097 * 3098 * @param l The callback that will run. 3099 */ 3100 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3101 mOnFocusChangeListener = l; 3102 } 3103 3104 /** 3105 * Add a listener that will be called when the bounds of the view change due to 3106 * layout processing. 3107 * 3108 * @param listener The listener that will be called when layout bounds change. 3109 */ 3110 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3111 if (mOnLayoutChangeListeners == null) { 3112 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3113 } 3114 mOnLayoutChangeListeners.add(listener); 3115 } 3116 3117 /** 3118 * Remove a listener for layout changes. 3119 * 3120 * @param listener The listener for layout bounds change. 3121 */ 3122 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3123 if (mOnLayoutChangeListeners == null) { 3124 return; 3125 } 3126 mOnLayoutChangeListeners.remove(listener); 3127 } 3128 3129 /** 3130 * Add a listener for attach state changes. 3131 * 3132 * This listener will be called whenever this view is attached or detached 3133 * from a window. Remove the listener using 3134 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3135 * 3136 * @param listener Listener to attach 3137 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3138 */ 3139 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3140 if (mOnAttachStateChangeListeners == null) { 3141 mOnAttachStateChangeListeners = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3142 } 3143 mOnAttachStateChangeListeners.add(listener); 3144 } 3145 3146 /** 3147 * Remove a listener for attach state changes. The listener will receive no further 3148 * notification of window attach/detach events. 3149 * 3150 * @param listener Listener to remove 3151 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3152 */ 3153 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3154 if (mOnAttachStateChangeListeners == null) { 3155 return; 3156 } 3157 mOnAttachStateChangeListeners.remove(listener); 3158 } 3159 3160 /** 3161 * Returns the focus-change callback registered for this view. 3162 * 3163 * @return The callback, or null if one is not registered. 3164 */ 3165 public OnFocusChangeListener getOnFocusChangeListener() { 3166 return mOnFocusChangeListener; 3167 } 3168 3169 /** 3170 * Register a callback to be invoked when this view is clicked. If this view is not 3171 * clickable, it becomes clickable. 3172 * 3173 * @param l The callback that will run 3174 * 3175 * @see #setClickable(boolean) 3176 */ 3177 public void setOnClickListener(OnClickListener l) { 3178 if (!isClickable()) { 3179 setClickable(true); 3180 } 3181 mOnClickListener = l; 3182 } 3183 3184 /** 3185 * Register a callback to be invoked when this view is clicked and held. If this view is not 3186 * long clickable, it becomes long clickable. 3187 * 3188 * @param l The callback that will run 3189 * 3190 * @see #setLongClickable(boolean) 3191 */ 3192 public void setOnLongClickListener(OnLongClickListener l) { 3193 if (!isLongClickable()) { 3194 setLongClickable(true); 3195 } 3196 mOnLongClickListener = l; 3197 } 3198 3199 /** 3200 * Register a callback to be invoked when the context menu for this view is 3201 * being built. If this view is not long clickable, it becomes long clickable. 3202 * 3203 * @param l The callback that will run 3204 * 3205 */ 3206 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3207 if (!isLongClickable()) { 3208 setLongClickable(true); 3209 } 3210 mOnCreateContextMenuListener = l; 3211 } 3212 3213 /** 3214 * Call this view's OnClickListener, if it is defined. 3215 * 3216 * @return True there was an assigned OnClickListener that was called, false 3217 * otherwise is returned. 3218 */ 3219 public boolean performClick() { 3220 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3221 3222 if (mOnClickListener != null) { 3223 playSoundEffect(SoundEffectConstants.CLICK); 3224 mOnClickListener.onClick(this); 3225 return true; 3226 } 3227 3228 return false; 3229 } 3230 3231 /** 3232 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3233 * OnLongClickListener did not consume the event. 3234 * 3235 * @return True if one of the above receivers consumed the event, false otherwise. 3236 */ 3237 public boolean performLongClick() { 3238 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3239 3240 boolean handled = false; 3241 if (mOnLongClickListener != null) { 3242 handled = mOnLongClickListener.onLongClick(View.this); 3243 } 3244 if (!handled) { 3245 handled = showContextMenu(); 3246 } 3247 if (handled) { 3248 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3249 } 3250 return handled; 3251 } 3252 3253 /** 3254 * Performs button-related actions during a touch down event. 3255 * 3256 * @param event The event. 3257 * @return True if the down was consumed. 3258 * 3259 * @hide 3260 */ 3261 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3262 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3263 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3264 return true; 3265 } 3266 } 3267 return false; 3268 } 3269 3270 /** 3271 * Bring up the context menu for this view. 3272 * 3273 * @return Whether a context menu was displayed. 3274 */ 3275 public boolean showContextMenu() { 3276 return getParent().showContextMenuForChild(this); 3277 } 3278 3279 /** 3280 * Bring up the context menu for this view, referring to the item under the specified point. 3281 * 3282 * @param x The referenced x coordinate. 3283 * @param y The referenced y coordinate. 3284 * @param metaState The keyboard modifiers that were pressed. 3285 * @return Whether a context menu was displayed. 3286 * 3287 * @hide 3288 */ 3289 public boolean showContextMenu(float x, float y, int metaState) { 3290 return showContextMenu(); 3291 } 3292 3293 /** 3294 * Start an action mode. 3295 * 3296 * @param callback Callback that will control the lifecycle of the action mode 3297 * @return The new action mode if it is started, null otherwise 3298 * 3299 * @see ActionMode 3300 */ 3301 public ActionMode startActionMode(ActionMode.Callback callback) { 3302 return getParent().startActionModeForChild(this, callback); 3303 } 3304 3305 /** 3306 * Register a callback to be invoked when a key is pressed in this view. 3307 * @param l the key listener to attach to this view 3308 */ 3309 public void setOnKeyListener(OnKeyListener l) { 3310 mOnKeyListener = l; 3311 } 3312 3313 /** 3314 * Register a callback to be invoked when a touch event is sent to this view. 3315 * @param l the touch listener to attach to this view 3316 */ 3317 public void setOnTouchListener(OnTouchListener l) { 3318 mOnTouchListener = l; 3319 } 3320 3321 /** 3322 * Register a callback to be invoked when a generic motion event is sent to this view. 3323 * @param l the generic motion listener to attach to this view 3324 */ 3325 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3326 mOnGenericMotionListener = l; 3327 } 3328 3329 /** 3330 * Register a drag event listener callback object for this View. The parameter is 3331 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3332 * View, the system calls the 3333 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3334 * @param l An implementation of {@link android.view.View.OnDragListener}. 3335 */ 3336 public void setOnDragListener(OnDragListener l) { 3337 mOnDragListener = l; 3338 } 3339 3340 /** 3341 * Give this view focus. This will cause 3342 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3343 * 3344 * Note: this does not check whether this {@link View} should get focus, it just 3345 * gives it focus no matter what. It should only be called internally by framework 3346 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3347 * 3348 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3349 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3350 * focus moved when requestFocus() is called. It may not always 3351 * apply, in which case use the default View.FOCUS_DOWN. 3352 * @param previouslyFocusedRect The rectangle of the view that had focus 3353 * prior in this View's coordinate system. 3354 */ 3355 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3356 if (DBG) { 3357 System.out.println(this + " requestFocus()"); 3358 } 3359 3360 if ((mPrivateFlags & FOCUSED) == 0) { 3361 mPrivateFlags |= FOCUSED; 3362 3363 if (mParent != null) { 3364 mParent.requestChildFocus(this, this); 3365 } 3366 3367 onFocusChanged(true, direction, previouslyFocusedRect); 3368 refreshDrawableState(); 3369 } 3370 } 3371 3372 /** 3373 * Request that a rectangle of this view be visible on the screen, 3374 * scrolling if necessary just enough. 3375 * 3376 * <p>A View should call this if it maintains some notion of which part 3377 * of its content is interesting. For example, a text editing view 3378 * should call this when its cursor moves. 3379 * 3380 * @param rectangle The rectangle. 3381 * @return Whether any parent scrolled. 3382 */ 3383 public boolean requestRectangleOnScreen(Rect rectangle) { 3384 return requestRectangleOnScreen(rectangle, false); 3385 } 3386 3387 /** 3388 * Request that a rectangle of this view be visible on the screen, 3389 * scrolling if necessary just enough. 3390 * 3391 * <p>A View should call this if it maintains some notion of which part 3392 * of its content is interesting. For example, a text editing view 3393 * should call this when its cursor moves. 3394 * 3395 * <p>When <code>immediate</code> is set to true, scrolling will not be 3396 * animated. 3397 * 3398 * @param rectangle The rectangle. 3399 * @param immediate True to forbid animated scrolling, false otherwise 3400 * @return Whether any parent scrolled. 3401 */ 3402 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3403 View child = this; 3404 ViewParent parent = mParent; 3405 boolean scrolled = false; 3406 while (parent != null) { 3407 scrolled |= parent.requestChildRectangleOnScreen(child, 3408 rectangle, immediate); 3409 3410 // offset rect so next call has the rectangle in the 3411 // coordinate system of its direct child. 3412 rectangle.offset(child.getLeft(), child.getTop()); 3413 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3414 3415 if (!(parent instanceof View)) { 3416 break; 3417 } 3418 3419 child = (View) parent; 3420 parent = child.getParent(); 3421 } 3422 return scrolled; 3423 } 3424 3425 /** 3426 * Called when this view wants to give up focus. This will cause 3427 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3428 */ 3429 public void clearFocus() { 3430 if (DBG) { 3431 System.out.println(this + " clearFocus()"); 3432 } 3433 3434 if ((mPrivateFlags & FOCUSED) != 0) { 3435 mPrivateFlags &= ~FOCUSED; 3436 3437 if (mParent != null) { 3438 mParent.clearChildFocus(this); 3439 } 3440 3441 onFocusChanged(false, 0, null); 3442 refreshDrawableState(); 3443 } 3444 } 3445 3446 /** 3447 * Called to clear the focus of a view that is about to be removed. 3448 * Doesn't call clearChildFocus, which prevents this view from taking 3449 * focus again before it has been removed from the parent 3450 */ 3451 void clearFocusForRemoval() { 3452 if ((mPrivateFlags & FOCUSED) != 0) { 3453 mPrivateFlags &= ~FOCUSED; 3454 3455 onFocusChanged(false, 0, null); 3456 refreshDrawableState(); 3457 } 3458 } 3459 3460 /** 3461 * Called internally by the view system when a new view is getting focus. 3462 * This is what clears the old focus. 3463 */ 3464 void unFocus() { 3465 if (DBG) { 3466 System.out.println(this + " unFocus()"); 3467 } 3468 3469 if ((mPrivateFlags & FOCUSED) != 0) { 3470 mPrivateFlags &= ~FOCUSED; 3471 3472 onFocusChanged(false, 0, null); 3473 refreshDrawableState(); 3474 } 3475 } 3476 3477 /** 3478 * Returns true if this view has focus iteself, or is the ancestor of the 3479 * view that has focus. 3480 * 3481 * @return True if this view has or contains focus, false otherwise. 3482 */ 3483 @ViewDebug.ExportedProperty(category = "focus") 3484 public boolean hasFocus() { 3485 return (mPrivateFlags & FOCUSED) != 0; 3486 } 3487 3488 /** 3489 * Returns true if this view is focusable or if it contains a reachable View 3490 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3491 * is a View whose parents do not block descendants focus. 3492 * 3493 * Only {@link #VISIBLE} views are considered focusable. 3494 * 3495 * @return True if the view is focusable or if the view contains a focusable 3496 * View, false otherwise. 3497 * 3498 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3499 */ 3500 public boolean hasFocusable() { 3501 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3502 } 3503 3504 /** 3505 * Called by the view system when the focus state of this view changes. 3506 * When the focus change event is caused by directional navigation, direction 3507 * and previouslyFocusedRect provide insight into where the focus is coming from. 3508 * When overriding, be sure to call up through to the super class so that 3509 * the standard focus handling will occur. 3510 * 3511 * @param gainFocus True if the View has focus; false otherwise. 3512 * @param direction The direction focus has moved when requestFocus() 3513 * is called to give this view focus. Values are 3514 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3515 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3516 * It may not always apply, in which case use the default. 3517 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3518 * system, of the previously focused view. If applicable, this will be 3519 * passed in as finer grained information about where the focus is coming 3520 * from (in addition to direction). Will be <code>null</code> otherwise. 3521 */ 3522 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3523 if (gainFocus) { 3524 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3525 } 3526 3527 InputMethodManager imm = InputMethodManager.peekInstance(); 3528 if (!gainFocus) { 3529 if (isPressed()) { 3530 setPressed(false); 3531 } 3532 if (imm != null && mAttachInfo != null 3533 && mAttachInfo.mHasWindowFocus) { 3534 imm.focusOut(this); 3535 } 3536 onFocusLost(); 3537 } else if (imm != null && mAttachInfo != null 3538 && mAttachInfo.mHasWindowFocus) { 3539 imm.focusIn(this); 3540 } 3541 3542 invalidate(true); 3543 if (mOnFocusChangeListener != null) { 3544 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3545 } 3546 3547 if (mAttachInfo != null) { 3548 mAttachInfo.mKeyDispatchState.reset(this); 3549 } 3550 } 3551 3552 /** 3553 * Sends an accessibility event of the given type. If accessiiblity is 3554 * not enabled this method has no effect. The default implementation calls 3555 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3556 * to populate information about the event source (this View), then calls 3557 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3558 * populate the text content of the event source including its descendants, 3559 * and last calls 3560 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3561 * on its parent to resuest sending of the event to interested parties. 3562 * 3563 * @param eventType The type of the event to send. 3564 * 3565 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3566 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3567 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3568 */ 3569 public void sendAccessibilityEvent(int eventType) { 3570 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3571 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3572 } 3573 } 3574 3575 /** 3576 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3577 * takes as an argument an empty {@link AccessibilityEvent} and does not 3578 * perfrom a check whether accessibility is enabled. 3579 * 3580 * @param event The event to send. 3581 * 3582 * @see #sendAccessibilityEvent(int) 3583 */ 3584 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3585 if (!isShown()) { 3586 return; 3587 } 3588 onInitializeAccessibilityEvent(event); 3589 dispatchPopulateAccessibilityEvent(event); 3590 // In the beginning we called #isShown(), so we know that getParent() is not null. 3591 getParent().requestSendAccessibilityEvent(this, event); 3592 } 3593 3594 /** 3595 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 3596 * to its children for adding their text content to the event. Note that the 3597 * event text is populated in a separate dispatch path since we add to the 3598 * event not only the text of the source but also the text of all its descendants. 3599 * </p> 3600 * A typical implementation will call 3601 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 3602 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3603 * on each child. Override this method if custom population of the event text 3604 * content is required. 3605 * 3606 * @param event The event. 3607 * 3608 * @return True if the event population was completed. 3609 */ 3610 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3611 onPopulateAccessibilityEvent(event); 3612 return false; 3613 } 3614 3615 /** 3616 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3617 * giving a chance to this View to populate the accessibility event with its 3618 * text content. While the implementation is free to modify other event 3619 * attributes this should be performed in 3620 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 3621 * <p> 3622 * Example: Adding formatted date string to an accessibility event in addition 3623 * to the text added by the super implementation. 3624 * </p><p><pre><code> 3625 * public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3626 * super.onPopulateAccessibilityEvent(event); 3627 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 3628 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 3629 * mCurrentDate.getTimeInMillis(), flags); 3630 * event.getText().add(selectedDateUtterance); 3631 * } 3632 * </code></pre></p> 3633 * 3634 * @param event The accessibility event which to populate. 3635 * 3636 * @see #sendAccessibilityEvent(int) 3637 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3638 */ 3639 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3640 3641 } 3642 3643 /** 3644 * Initializes an {@link AccessibilityEvent} with information about the 3645 * the type of the event and this View which is the event source. In other 3646 * words, the source of an accessibility event is the view whose state 3647 * change triggered firing the event. 3648 * <p> 3649 * Example: Setting the password property of an event in addition 3650 * to properties set by the super implementation. 3651 * </p><p><pre><code> 3652 * public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3653 * super.onInitializeAccessibilityEvent(event); 3654 * event.setPassword(true); 3655 * } 3656 * </code></pre></p> 3657 * @param event The event to initialeze. 3658 * 3659 * @see #sendAccessibilityEvent(int) 3660 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3661 */ 3662 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3663 event.setSource(this); 3664 event.setClassName(getClass().getName()); 3665 event.setPackageName(getContext().getPackageName()); 3666 event.setEnabled(isEnabled()); 3667 event.setContentDescription(mContentDescription); 3668 3669 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3670 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3671 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3672 event.setItemCount(focusablesTempList.size()); 3673 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3674 focusablesTempList.clear(); 3675 } 3676 } 3677 3678 /** 3679 * Returns an {@link AccessibilityNodeInfo} representing this view from the 3680 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 3681 * This method is responsible for obtaining an accessibility node info from a 3682 * pool of reusable instances and calling 3683 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 3684 * initialize the former. 3685 * <p> 3686 * Note: The client is responsible for recycling the obtained instance by calling 3687 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 3688 * </p> 3689 * @return A populated {@link AccessibilityNodeInfo}. 3690 * 3691 * @see AccessibilityNodeInfo 3692 */ 3693 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 3694 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 3695 onInitializeAccessibilityNodeInfo(info); 3696 return info; 3697 } 3698 3699 /** 3700 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 3701 * The base implementation sets: 3702 * <ul> 3703 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 3704 * <li>{@link AccessibilityNodeInfo#setBounds(Rect)},</li> 3705 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 3706 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 3707 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 3708 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 3709 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 3710 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 3711 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 3712 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 3713 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 3714 * </ul> 3715 * <p> 3716 * Subclasses should override this method, call the super implementation, 3717 * and set additional attributes. 3718 * </p> 3719 * @param info The instance to initialize. 3720 */ 3721 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 3722 Rect bounds = mAttachInfo.mTmpInvalRect; 3723 getDrawingRect(bounds); 3724 info.setBounds(bounds); 3725 3726 ViewParent parent = getParent(); 3727 if (parent instanceof View) { 3728 View parentView = (View) parent; 3729 info.setParent(parentView); 3730 } 3731 3732 info.setPackageName(mContext.getPackageName()); 3733 info.setClassName(getClass().getName()); 3734 info.setContentDescription(getContentDescription()); 3735 3736 info.setEnabled(isEnabled()); 3737 info.setClickable(isClickable()); 3738 info.setFocusable(isFocusable()); 3739 info.setFocused(isFocused()); 3740 info.setSelected(isSelected()); 3741 info.setLongClickable(isLongClickable()); 3742 3743 // TODO: These make sense only if we are in an AdapterView but all 3744 // views can be selected. Maybe from accessiiblity perspective 3745 // we should report as selectable view in an AdapterView. 3746 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 3747 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 3748 3749 if (isFocusable()) { 3750 if (isFocused()) { 3751 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 3752 } else { 3753 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 3754 } 3755 } 3756 } 3757 3758 /** 3759 * Gets the unique identifier of this view on the screen for accessibility purposes. 3760 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 3761 * 3762 * @return The view accessibility id. 3763 * 3764 * @hide 3765 */ 3766 public int getAccessibilityViewId() { 3767 if (mAccessibilityViewId == NO_ID) { 3768 mAccessibilityViewId = sNextAccessibilityViewId++; 3769 } 3770 return mAccessibilityViewId; 3771 } 3772 3773 /** 3774 * Gets the unique identifier of the window in which this View reseides. 3775 * 3776 * @return The window accessibility id. 3777 * 3778 * @hide 3779 */ 3780 public int getAccessibilityWindowId() { 3781 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 3782 } 3783 3784 /** 3785 * Gets the {@link View} description. It briefly describes the view and is 3786 * primarily used for accessibility support. Set this property to enable 3787 * better accessibility support for your application. This is especially 3788 * true for views that do not have textual representation (For example, 3789 * ImageButton). 3790 * 3791 * @return The content descriptiopn. 3792 * 3793 * @attr ref android.R.styleable#View_contentDescription 3794 */ 3795 public CharSequence getContentDescription() { 3796 return mContentDescription; 3797 } 3798 3799 /** 3800 * Sets the {@link View} description. It briefly describes the view and is 3801 * primarily used for accessibility support. Set this property to enable 3802 * better accessibility support for your application. This is especially 3803 * true for views that do not have textual representation (For example, 3804 * ImageButton). 3805 * 3806 * @param contentDescription The content description. 3807 * 3808 * @attr ref android.R.styleable#View_contentDescription 3809 */ 3810 public void setContentDescription(CharSequence contentDescription) { 3811 mContentDescription = contentDescription; 3812 } 3813 3814 /** 3815 * Invoked whenever this view loses focus, either by losing window focus or by losing 3816 * focus within its window. This method can be used to clear any state tied to the 3817 * focus. For instance, if a button is held pressed with the trackball and the window 3818 * loses focus, this method can be used to cancel the press. 3819 * 3820 * Subclasses of View overriding this method should always call super.onFocusLost(). 3821 * 3822 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3823 * @see #onWindowFocusChanged(boolean) 3824 * 3825 * @hide pending API council approval 3826 */ 3827 protected void onFocusLost() { 3828 resetPressedState(); 3829 } 3830 3831 private void resetPressedState() { 3832 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3833 return; 3834 } 3835 3836 if (isPressed()) { 3837 setPressed(false); 3838 3839 if (!mHasPerformedLongPress) { 3840 removeLongPressCallback(); 3841 } 3842 } 3843 } 3844 3845 /** 3846 * Returns true if this view has focus 3847 * 3848 * @return True if this view has focus, false otherwise. 3849 */ 3850 @ViewDebug.ExportedProperty(category = "focus") 3851 public boolean isFocused() { 3852 return (mPrivateFlags & FOCUSED) != 0; 3853 } 3854 3855 /** 3856 * Find the view in the hierarchy rooted at this view that currently has 3857 * focus. 3858 * 3859 * @return The view that currently has focus, or null if no focused view can 3860 * be found. 3861 */ 3862 public View findFocus() { 3863 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3864 } 3865 3866 /** 3867 * Change whether this view is one of the set of scrollable containers in 3868 * its window. This will be used to determine whether the window can 3869 * resize or must pan when a soft input area is open -- scrollable 3870 * containers allow the window to use resize mode since the container 3871 * will appropriately shrink. 3872 */ 3873 public void setScrollContainer(boolean isScrollContainer) { 3874 if (isScrollContainer) { 3875 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3876 mAttachInfo.mScrollContainers.add(this); 3877 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3878 } 3879 mPrivateFlags |= SCROLL_CONTAINER; 3880 } else { 3881 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3882 mAttachInfo.mScrollContainers.remove(this); 3883 } 3884 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3885 } 3886 } 3887 3888 /** 3889 * Returns the quality of the drawing cache. 3890 * 3891 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3892 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3893 * 3894 * @see #setDrawingCacheQuality(int) 3895 * @see #setDrawingCacheEnabled(boolean) 3896 * @see #isDrawingCacheEnabled() 3897 * 3898 * @attr ref android.R.styleable#View_drawingCacheQuality 3899 */ 3900 public int getDrawingCacheQuality() { 3901 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3902 } 3903 3904 /** 3905 * Set the drawing cache quality of this view. This value is used only when the 3906 * drawing cache is enabled 3907 * 3908 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3909 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3910 * 3911 * @see #getDrawingCacheQuality() 3912 * @see #setDrawingCacheEnabled(boolean) 3913 * @see #isDrawingCacheEnabled() 3914 * 3915 * @attr ref android.R.styleable#View_drawingCacheQuality 3916 */ 3917 public void setDrawingCacheQuality(int quality) { 3918 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3919 } 3920 3921 /** 3922 * Returns whether the screen should remain on, corresponding to the current 3923 * value of {@link #KEEP_SCREEN_ON}. 3924 * 3925 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3926 * 3927 * @see #setKeepScreenOn(boolean) 3928 * 3929 * @attr ref android.R.styleable#View_keepScreenOn 3930 */ 3931 public boolean getKeepScreenOn() { 3932 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3933 } 3934 3935 /** 3936 * Controls whether the screen should remain on, modifying the 3937 * value of {@link #KEEP_SCREEN_ON}. 3938 * 3939 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3940 * 3941 * @see #getKeepScreenOn() 3942 * 3943 * @attr ref android.R.styleable#View_keepScreenOn 3944 */ 3945 public void setKeepScreenOn(boolean keepScreenOn) { 3946 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3947 } 3948 3949 /** 3950 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3951 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3952 * 3953 * @attr ref android.R.styleable#View_nextFocusLeft 3954 */ 3955 public int getNextFocusLeftId() { 3956 return mNextFocusLeftId; 3957 } 3958 3959 /** 3960 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3961 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3962 * decide automatically. 3963 * 3964 * @attr ref android.R.styleable#View_nextFocusLeft 3965 */ 3966 public void setNextFocusLeftId(int nextFocusLeftId) { 3967 mNextFocusLeftId = nextFocusLeftId; 3968 } 3969 3970 /** 3971 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3972 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3973 * 3974 * @attr ref android.R.styleable#View_nextFocusRight 3975 */ 3976 public int getNextFocusRightId() { 3977 return mNextFocusRightId; 3978 } 3979 3980 /** 3981 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3982 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3983 * decide automatically. 3984 * 3985 * @attr ref android.R.styleable#View_nextFocusRight 3986 */ 3987 public void setNextFocusRightId(int nextFocusRightId) { 3988 mNextFocusRightId = nextFocusRightId; 3989 } 3990 3991 /** 3992 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3993 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3994 * 3995 * @attr ref android.R.styleable#View_nextFocusUp 3996 */ 3997 public int getNextFocusUpId() { 3998 return mNextFocusUpId; 3999 } 4000 4001 /** 4002 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4003 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4004 * decide automatically. 4005 * 4006 * @attr ref android.R.styleable#View_nextFocusUp 4007 */ 4008 public void setNextFocusUpId(int nextFocusUpId) { 4009 mNextFocusUpId = nextFocusUpId; 4010 } 4011 4012 /** 4013 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4014 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4015 * 4016 * @attr ref android.R.styleable#View_nextFocusDown 4017 */ 4018 public int getNextFocusDownId() { 4019 return mNextFocusDownId; 4020 } 4021 4022 /** 4023 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4024 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4025 * decide automatically. 4026 * 4027 * @attr ref android.R.styleable#View_nextFocusDown 4028 */ 4029 public void setNextFocusDownId(int nextFocusDownId) { 4030 mNextFocusDownId = nextFocusDownId; 4031 } 4032 4033 /** 4034 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4035 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4036 * 4037 * @attr ref android.R.styleable#View_nextFocusForward 4038 */ 4039 public int getNextFocusForwardId() { 4040 return mNextFocusForwardId; 4041 } 4042 4043 /** 4044 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4045 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4046 * decide automatically. 4047 * 4048 * @attr ref android.R.styleable#View_nextFocusForward 4049 */ 4050 public void setNextFocusForwardId(int nextFocusForwardId) { 4051 mNextFocusForwardId = nextFocusForwardId; 4052 } 4053 4054 /** 4055 * Returns the visibility of this view and all of its ancestors 4056 * 4057 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4058 */ 4059 public boolean isShown() { 4060 View current = this; 4061 //noinspection ConstantConditions 4062 do { 4063 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4064 return false; 4065 } 4066 ViewParent parent = current.mParent; 4067 if (parent == null) { 4068 return false; // We are not attached to the view root 4069 } 4070 if (!(parent instanceof View)) { 4071 return true; 4072 } 4073 current = (View) parent; 4074 } while (current != null); 4075 4076 return false; 4077 } 4078 4079 /** 4080 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4081 * is set 4082 * 4083 * @param insets Insets for system windows 4084 * 4085 * @return True if this view applied the insets, false otherwise 4086 */ 4087 protected boolean fitSystemWindows(Rect insets) { 4088 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4089 mPaddingLeft = insets.left; 4090 mPaddingTop = insets.top; 4091 mPaddingRight = insets.right; 4092 mPaddingBottom = insets.bottom; 4093 requestLayout(); 4094 return true; 4095 } 4096 return false; 4097 } 4098 4099 /** 4100 * Returns the visibility status for this view. 4101 * 4102 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4103 * @attr ref android.R.styleable#View_visibility 4104 */ 4105 @ViewDebug.ExportedProperty(mapping = { 4106 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4107 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4108 @ViewDebug.IntToString(from = GONE, to = "GONE") 4109 }) 4110 public int getVisibility() { 4111 return mViewFlags & VISIBILITY_MASK; 4112 } 4113 4114 /** 4115 * Set the enabled state of this view. 4116 * 4117 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4118 * @attr ref android.R.styleable#View_visibility 4119 */ 4120 @RemotableViewMethod 4121 public void setVisibility(int visibility) { 4122 setFlags(visibility, VISIBILITY_MASK); 4123 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4124 } 4125 4126 /** 4127 * Returns the enabled status for this view. The interpretation of the 4128 * enabled state varies by subclass. 4129 * 4130 * @return True if this view is enabled, false otherwise. 4131 */ 4132 @ViewDebug.ExportedProperty 4133 public boolean isEnabled() { 4134 return (mViewFlags & ENABLED_MASK) == ENABLED; 4135 } 4136 4137 /** 4138 * Set the enabled state of this view. The interpretation of the enabled 4139 * state varies by subclass. 4140 * 4141 * @param enabled True if this view is enabled, false otherwise. 4142 */ 4143 @RemotableViewMethod 4144 public void setEnabled(boolean enabled) { 4145 if (enabled == isEnabled()) return; 4146 4147 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4148 4149 /* 4150 * The View most likely has to change its appearance, so refresh 4151 * the drawable state. 4152 */ 4153 refreshDrawableState(); 4154 4155 // Invalidate too, since the default behavior for views is to be 4156 // be drawn at 50% alpha rather than to change the drawable. 4157 invalidate(true); 4158 } 4159 4160 /** 4161 * Set whether this view can receive the focus. 4162 * 4163 * Setting this to false will also ensure that this view is not focusable 4164 * in touch mode. 4165 * 4166 * @param focusable If true, this view can receive the focus. 4167 * 4168 * @see #setFocusableInTouchMode(boolean) 4169 * @attr ref android.R.styleable#View_focusable 4170 */ 4171 public void setFocusable(boolean focusable) { 4172 if (!focusable) { 4173 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4174 } 4175 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4176 } 4177 4178 /** 4179 * Set whether this view can receive focus while in touch mode. 4180 * 4181 * Setting this to true will also ensure that this view is focusable. 4182 * 4183 * @param focusableInTouchMode If true, this view can receive the focus while 4184 * in touch mode. 4185 * 4186 * @see #setFocusable(boolean) 4187 * @attr ref android.R.styleable#View_focusableInTouchMode 4188 */ 4189 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4190 // Focusable in touch mode should always be set before the focusable flag 4191 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4192 // which, in touch mode, will not successfully request focus on this view 4193 // because the focusable in touch mode flag is not set 4194 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4195 if (focusableInTouchMode) { 4196 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4197 } 4198 } 4199 4200 /** 4201 * Set whether this view should have sound effects enabled for events such as 4202 * clicking and touching. 4203 * 4204 * <p>You may wish to disable sound effects for a view if you already play sounds, 4205 * for instance, a dial key that plays dtmf tones. 4206 * 4207 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4208 * @see #isSoundEffectsEnabled() 4209 * @see #playSoundEffect(int) 4210 * @attr ref android.R.styleable#View_soundEffectsEnabled 4211 */ 4212 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4213 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4214 } 4215 4216 /** 4217 * @return whether this view should have sound effects enabled for events such as 4218 * clicking and touching. 4219 * 4220 * @see #setSoundEffectsEnabled(boolean) 4221 * @see #playSoundEffect(int) 4222 * @attr ref android.R.styleable#View_soundEffectsEnabled 4223 */ 4224 @ViewDebug.ExportedProperty 4225 public boolean isSoundEffectsEnabled() { 4226 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4227 } 4228 4229 /** 4230 * Set whether this view should have haptic feedback for events such as 4231 * long presses. 4232 * 4233 * <p>You may wish to disable haptic feedback if your view already controls 4234 * its own haptic feedback. 4235 * 4236 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4237 * @see #isHapticFeedbackEnabled() 4238 * @see #performHapticFeedback(int) 4239 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4240 */ 4241 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4242 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4243 } 4244 4245 /** 4246 * @return whether this view should have haptic feedback enabled for events 4247 * long presses. 4248 * 4249 * @see #setHapticFeedbackEnabled(boolean) 4250 * @see #performHapticFeedback(int) 4251 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4252 */ 4253 @ViewDebug.ExportedProperty 4254 public boolean isHapticFeedbackEnabled() { 4255 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4256 } 4257 4258 /** 4259 * Returns the layout direction for this view. 4260 * 4261 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4262 * {@link #LAYOUT_DIRECTION_RTL}, 4263 * {@link #LAYOUT_DIRECTION_INHERIT} or 4264 * {@link #LAYOUT_DIRECTION_LOCALE}. 4265 * @attr ref android.R.styleable#View_layoutDirection 4266 * @hide 4267 */ 4268 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4269 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4270 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4271 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4272 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4273 }) 4274 public int getLayoutDirection() { 4275 return mViewFlags & LAYOUT_DIRECTION_MASK; 4276 } 4277 4278 /** 4279 * Set the layout direction for this view. 4280 * 4281 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4282 * {@link #LAYOUT_DIRECTION_RTL}, 4283 * {@link #LAYOUT_DIRECTION_INHERIT} or 4284 * {@link #LAYOUT_DIRECTION_LOCALE}. 4285 * @attr ref android.R.styleable#View_layoutDirection 4286 * @hide 4287 */ 4288 @RemotableViewMethod 4289 public void setLayoutDirection(int layoutDirection) { 4290 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4291 } 4292 4293 /** 4294 * If this view doesn't do any drawing on its own, set this flag to 4295 * allow further optimizations. By default, this flag is not set on 4296 * View, but could be set on some View subclasses such as ViewGroup. 4297 * 4298 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4299 * you should clear this flag. 4300 * 4301 * @param willNotDraw whether or not this View draw on its own 4302 */ 4303 public void setWillNotDraw(boolean willNotDraw) { 4304 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4305 } 4306 4307 /** 4308 * Returns whether or not this View draws on its own. 4309 * 4310 * @return true if this view has nothing to draw, false otherwise 4311 */ 4312 @ViewDebug.ExportedProperty(category = "drawing") 4313 public boolean willNotDraw() { 4314 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4315 } 4316 4317 /** 4318 * When a View's drawing cache is enabled, drawing is redirected to an 4319 * offscreen bitmap. Some views, like an ImageView, must be able to 4320 * bypass this mechanism if they already draw a single bitmap, to avoid 4321 * unnecessary usage of the memory. 4322 * 4323 * @param willNotCacheDrawing true if this view does not cache its 4324 * drawing, false otherwise 4325 */ 4326 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 4327 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 4328 } 4329 4330 /** 4331 * Returns whether or not this View can cache its drawing or not. 4332 * 4333 * @return true if this view does not cache its drawing, false otherwise 4334 */ 4335 @ViewDebug.ExportedProperty(category = "drawing") 4336 public boolean willNotCacheDrawing() { 4337 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 4338 } 4339 4340 /** 4341 * Indicates whether this view reacts to click events or not. 4342 * 4343 * @return true if the view is clickable, false otherwise 4344 * 4345 * @see #setClickable(boolean) 4346 * @attr ref android.R.styleable#View_clickable 4347 */ 4348 @ViewDebug.ExportedProperty 4349 public boolean isClickable() { 4350 return (mViewFlags & CLICKABLE) == CLICKABLE; 4351 } 4352 4353 /** 4354 * Enables or disables click events for this view. When a view 4355 * is clickable it will change its state to "pressed" on every click. 4356 * Subclasses should set the view clickable to visually react to 4357 * user's clicks. 4358 * 4359 * @param clickable true to make the view clickable, false otherwise 4360 * 4361 * @see #isClickable() 4362 * @attr ref android.R.styleable#View_clickable 4363 */ 4364 public void setClickable(boolean clickable) { 4365 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 4366 } 4367 4368 /** 4369 * Indicates whether this view reacts to long click events or not. 4370 * 4371 * @return true if the view is long clickable, false otherwise 4372 * 4373 * @see #setLongClickable(boolean) 4374 * @attr ref android.R.styleable#View_longClickable 4375 */ 4376 public boolean isLongClickable() { 4377 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4378 } 4379 4380 /** 4381 * Enables or disables long click events for this view. When a view is long 4382 * clickable it reacts to the user holding down the button for a longer 4383 * duration than a tap. This event can either launch the listener or a 4384 * context menu. 4385 * 4386 * @param longClickable true to make the view long clickable, false otherwise 4387 * @see #isLongClickable() 4388 * @attr ref android.R.styleable#View_longClickable 4389 */ 4390 public void setLongClickable(boolean longClickable) { 4391 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4392 } 4393 4394 /** 4395 * Sets the pressed state for this view. 4396 * 4397 * @see #isClickable() 4398 * @see #setClickable(boolean) 4399 * 4400 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4401 * the View's internal state from a previously set "pressed" state. 4402 */ 4403 public void setPressed(boolean pressed) { 4404 if (pressed) { 4405 mPrivateFlags |= PRESSED; 4406 } else { 4407 mPrivateFlags &= ~PRESSED; 4408 } 4409 refreshDrawableState(); 4410 dispatchSetPressed(pressed); 4411 } 4412 4413 /** 4414 * Dispatch setPressed to all of this View's children. 4415 * 4416 * @see #setPressed(boolean) 4417 * 4418 * @param pressed The new pressed state 4419 */ 4420 protected void dispatchSetPressed(boolean pressed) { 4421 } 4422 4423 /** 4424 * Indicates whether the view is currently in pressed state. Unless 4425 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 4426 * the pressed state. 4427 * 4428 * @see #setPressed(boolean) 4429 * @see #isClickable() 4430 * @see #setClickable(boolean) 4431 * 4432 * @return true if the view is currently pressed, false otherwise 4433 */ 4434 public boolean isPressed() { 4435 return (mPrivateFlags & PRESSED) == PRESSED; 4436 } 4437 4438 /** 4439 * Indicates whether this view will save its state (that is, 4440 * whether its {@link #onSaveInstanceState} method will be called). 4441 * 4442 * @return Returns true if the view state saving is enabled, else false. 4443 * 4444 * @see #setSaveEnabled(boolean) 4445 * @attr ref android.R.styleable#View_saveEnabled 4446 */ 4447 public boolean isSaveEnabled() { 4448 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 4449 } 4450 4451 /** 4452 * Controls whether the saving of this view's state is 4453 * enabled (that is, whether its {@link #onSaveInstanceState} method 4454 * will be called). Note that even if freezing is enabled, the 4455 * view still must have an id assigned to it (via {@link #setId(int)}) 4456 * for its state to be saved. This flag can only disable the 4457 * saving of this view; any child views may still have their state saved. 4458 * 4459 * @param enabled Set to false to <em>disable</em> state saving, or true 4460 * (the default) to allow it. 4461 * 4462 * @see #isSaveEnabled() 4463 * @see #setId(int) 4464 * @see #onSaveInstanceState() 4465 * @attr ref android.R.styleable#View_saveEnabled 4466 */ 4467 public void setSaveEnabled(boolean enabled) { 4468 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 4469 } 4470 4471 /** 4472 * Gets whether the framework should discard touches when the view's 4473 * window is obscured by another visible window. 4474 * Refer to the {@link View} security documentation for more details. 4475 * 4476 * @return True if touch filtering is enabled. 4477 * 4478 * @see #setFilterTouchesWhenObscured(boolean) 4479 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4480 */ 4481 @ViewDebug.ExportedProperty 4482 public boolean getFilterTouchesWhenObscured() { 4483 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4484 } 4485 4486 /** 4487 * Sets whether the framework should discard touches when the view's 4488 * window is obscured by another visible window. 4489 * Refer to the {@link View} security documentation for more details. 4490 * 4491 * @param enabled True if touch filtering should be enabled. 4492 * 4493 * @see #getFilterTouchesWhenObscured 4494 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4495 */ 4496 public void setFilterTouchesWhenObscured(boolean enabled) { 4497 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4498 FILTER_TOUCHES_WHEN_OBSCURED); 4499 } 4500 4501 /** 4502 * Indicates whether the entire hierarchy under this view will save its 4503 * state when a state saving traversal occurs from its parent. The default 4504 * is true; if false, these views will not be saved unless 4505 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4506 * 4507 * @return Returns true if the view state saving from parent is enabled, else false. 4508 * 4509 * @see #setSaveFromParentEnabled(boolean) 4510 */ 4511 public boolean isSaveFromParentEnabled() { 4512 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4513 } 4514 4515 /** 4516 * Controls whether the entire hierarchy under this view will save its 4517 * state when a state saving traversal occurs from its parent. The default 4518 * is true; if false, these views will not be saved unless 4519 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4520 * 4521 * @param enabled Set to false to <em>disable</em> state saving, or true 4522 * (the default) to allow it. 4523 * 4524 * @see #isSaveFromParentEnabled() 4525 * @see #setId(int) 4526 * @see #onSaveInstanceState() 4527 */ 4528 public void setSaveFromParentEnabled(boolean enabled) { 4529 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4530 } 4531 4532 4533 /** 4534 * Returns whether this View is able to take focus. 4535 * 4536 * @return True if this view can take focus, or false otherwise. 4537 * @attr ref android.R.styleable#View_focusable 4538 */ 4539 @ViewDebug.ExportedProperty(category = "focus") 4540 public final boolean isFocusable() { 4541 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4542 } 4543 4544 /** 4545 * When a view is focusable, it may not want to take focus when in touch mode. 4546 * For example, a button would like focus when the user is navigating via a D-pad 4547 * so that the user can click on it, but once the user starts touching the screen, 4548 * the button shouldn't take focus 4549 * @return Whether the view is focusable in touch mode. 4550 * @attr ref android.R.styleable#View_focusableInTouchMode 4551 */ 4552 @ViewDebug.ExportedProperty 4553 public final boolean isFocusableInTouchMode() { 4554 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4555 } 4556 4557 /** 4558 * Find the nearest view in the specified direction that can take focus. 4559 * This does not actually give focus to that view. 4560 * 4561 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4562 * 4563 * @return The nearest focusable in the specified direction, or null if none 4564 * can be found. 4565 */ 4566 public View focusSearch(int direction) { 4567 if (mParent != null) { 4568 return mParent.focusSearch(this, direction); 4569 } else { 4570 return null; 4571 } 4572 } 4573 4574 /** 4575 * This method is the last chance for the focused view and its ancestors to 4576 * respond to an arrow key. This is called when the focused view did not 4577 * consume the key internally, nor could the view system find a new view in 4578 * the requested direction to give focus to. 4579 * 4580 * @param focused The currently focused view. 4581 * @param direction The direction focus wants to move. One of FOCUS_UP, 4582 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4583 * @return True if the this view consumed this unhandled move. 4584 */ 4585 public boolean dispatchUnhandledMove(View focused, int direction) { 4586 return false; 4587 } 4588 4589 /** 4590 * If a user manually specified the next view id for a particular direction, 4591 * use the root to look up the view. 4592 * @param root The root view of the hierarchy containing this view. 4593 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4594 * or FOCUS_BACKWARD. 4595 * @return The user specified next view, or null if there is none. 4596 */ 4597 View findUserSetNextFocus(View root, int direction) { 4598 switch (direction) { 4599 case FOCUS_LEFT: 4600 if (mNextFocusLeftId == View.NO_ID) return null; 4601 return findViewShouldExist(root, mNextFocusLeftId); 4602 case FOCUS_RIGHT: 4603 if (mNextFocusRightId == View.NO_ID) return null; 4604 return findViewShouldExist(root, mNextFocusRightId); 4605 case FOCUS_UP: 4606 if (mNextFocusUpId == View.NO_ID) return null; 4607 return findViewShouldExist(root, mNextFocusUpId); 4608 case FOCUS_DOWN: 4609 if (mNextFocusDownId == View.NO_ID) return null; 4610 return findViewShouldExist(root, mNextFocusDownId); 4611 case FOCUS_FORWARD: 4612 if (mNextFocusForwardId == View.NO_ID) return null; 4613 return findViewShouldExist(root, mNextFocusForwardId); 4614 case FOCUS_BACKWARD: { 4615 final int id = mID; 4616 return root.findViewByPredicate(new Predicate<View>() { 4617 @Override 4618 public boolean apply(View t) { 4619 return t.mNextFocusForwardId == id; 4620 } 4621 }); 4622 } 4623 } 4624 return null; 4625 } 4626 4627 private static View findViewShouldExist(View root, int childViewId) { 4628 View result = root.findViewById(childViewId); 4629 if (result == null) { 4630 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4631 + "by user for id " + childViewId); 4632 } 4633 return result; 4634 } 4635 4636 /** 4637 * Find and return all focusable views that are descendants of this view, 4638 * possibly including this view if it is focusable itself. 4639 * 4640 * @param direction The direction of the focus 4641 * @return A list of focusable views 4642 */ 4643 public ArrayList<View> getFocusables(int direction) { 4644 ArrayList<View> result = new ArrayList<View>(24); 4645 addFocusables(result, direction); 4646 return result; 4647 } 4648 4649 /** 4650 * Add any focusable views that are descendants of this view (possibly 4651 * including this view if it is focusable itself) to views. If we are in touch mode, 4652 * only add views that are also focusable in touch mode. 4653 * 4654 * @param views Focusable views found so far 4655 * @param direction The direction of the focus 4656 */ 4657 public void addFocusables(ArrayList<View> views, int direction) { 4658 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4659 } 4660 4661 /** 4662 * Adds any focusable views that are descendants of this view (possibly 4663 * including this view if it is focusable itself) to views. This method 4664 * adds all focusable views regardless if we are in touch mode or 4665 * only views focusable in touch mode if we are in touch mode depending on 4666 * the focusable mode paramater. 4667 * 4668 * @param views Focusable views found so far or null if all we are interested is 4669 * the number of focusables. 4670 * @param direction The direction of the focus. 4671 * @param focusableMode The type of focusables to be added. 4672 * 4673 * @see #FOCUSABLES_ALL 4674 * @see #FOCUSABLES_TOUCH_MODE 4675 */ 4676 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4677 if (!isFocusable()) { 4678 return; 4679 } 4680 4681 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4682 isInTouchMode() && !isFocusableInTouchMode()) { 4683 return; 4684 } 4685 4686 if (views != null) { 4687 views.add(this); 4688 } 4689 } 4690 4691 /** 4692 * Finds the Views that contain given text. The containment is case insensitive. 4693 * As View's text is considered any text content that View renders. 4694 * 4695 * @param outViews The output list of matching Views. 4696 * @param text The text to match against. 4697 */ 4698 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 4699 } 4700 4701 /** 4702 * Find and return all touchable views that are descendants of this view, 4703 * possibly including this view if it is touchable itself. 4704 * 4705 * @return A list of touchable views 4706 */ 4707 public ArrayList<View> getTouchables() { 4708 ArrayList<View> result = new ArrayList<View>(); 4709 addTouchables(result); 4710 return result; 4711 } 4712 4713 /** 4714 * Add any touchable views that are descendants of this view (possibly 4715 * including this view if it is touchable itself) to views. 4716 * 4717 * @param views Touchable views found so far 4718 */ 4719 public void addTouchables(ArrayList<View> views) { 4720 final int viewFlags = mViewFlags; 4721 4722 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4723 && (viewFlags & ENABLED_MASK) == ENABLED) { 4724 views.add(this); 4725 } 4726 } 4727 4728 /** 4729 * Call this to try to give focus to a specific view or to one of its 4730 * descendants. 4731 * 4732 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 4733 * false), or if it is focusable and it is not focusable in touch mode 4734 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 4735 * 4736 * See also {@link #focusSearch(int)}, which is what you call to say that you 4737 * have focus, and you want your parent to look for the next one. 4738 * 4739 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4740 * {@link #FOCUS_DOWN} and <code>null</code>. 4741 * 4742 * @return Whether this view or one of its descendants actually took focus. 4743 */ 4744 public final boolean requestFocus() { 4745 return requestFocus(View.FOCUS_DOWN); 4746 } 4747 4748 4749 /** 4750 * Call this to try to give focus to a specific view or to one of its 4751 * descendants and give it a hint about what direction focus is heading. 4752 * 4753 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 4754 * false), or if it is focusable and it is not focusable in touch mode 4755 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 4756 * 4757 * See also {@link #focusSearch(int)}, which is what you call to say that you 4758 * have focus, and you want your parent to look for the next one. 4759 * 4760 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4761 * <code>null</code> set for the previously focused rectangle. 4762 * 4763 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4764 * @return Whether this view or one of its descendants actually took focus. 4765 */ 4766 public final boolean requestFocus(int direction) { 4767 return requestFocus(direction, null); 4768 } 4769 4770 /** 4771 * Call this to try to give focus to a specific view or to one of its descendants 4772 * and give it hints about the direction and a specific rectangle that the focus 4773 * is coming from. The rectangle can help give larger views a finer grained hint 4774 * about where focus is coming from, and therefore, where to show selection, or 4775 * forward focus change internally. 4776 * 4777 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 4778 * false), or if it is focusable and it is not focusable in touch mode 4779 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 4780 * 4781 * A View will not take focus if it is not visible. 4782 * 4783 * A View will not take focus if one of its parents has 4784 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 4785 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4786 * 4787 * See also {@link #focusSearch(int)}, which is what you call to say that you 4788 * have focus, and you want your parent to look for the next one. 4789 * 4790 * You may wish to override this method if your custom {@link View} has an internal 4791 * {@link View} that it wishes to forward the request to. 4792 * 4793 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4794 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4795 * to give a finer grained hint about where focus is coming from. May be null 4796 * if there is no hint. 4797 * @return Whether this view or one of its descendants actually took focus. 4798 */ 4799 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4800 // need to be focusable 4801 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4802 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4803 return false; 4804 } 4805 4806 // need to be focusable in touch mode if in touch mode 4807 if (isInTouchMode() && 4808 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4809 return false; 4810 } 4811 4812 // need to not have any parents blocking us 4813 if (hasAncestorThatBlocksDescendantFocus()) { 4814 return false; 4815 } 4816 4817 handleFocusGainInternal(direction, previouslyFocusedRect); 4818 return true; 4819 } 4820 4821 /** Gets the ViewAncestor, or null if not attached. */ 4822 /*package*/ ViewAncestor getViewAncestor() { 4823 View root = getRootView(); 4824 return root != null ? (ViewAncestor)root.getParent() : null; 4825 } 4826 4827 /** 4828 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4829 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4830 * touch mode to request focus when they are touched. 4831 * 4832 * @return Whether this view or one of its descendants actually took focus. 4833 * 4834 * @see #isInTouchMode() 4835 * 4836 */ 4837 public final boolean requestFocusFromTouch() { 4838 // Leave touch mode if we need to 4839 if (isInTouchMode()) { 4840 ViewAncestor viewRoot = getViewAncestor(); 4841 if (viewRoot != null) { 4842 viewRoot.ensureTouchMode(false); 4843 } 4844 } 4845 return requestFocus(View.FOCUS_DOWN); 4846 } 4847 4848 /** 4849 * @return Whether any ancestor of this view blocks descendant focus. 4850 */ 4851 private boolean hasAncestorThatBlocksDescendantFocus() { 4852 ViewParent ancestor = mParent; 4853 while (ancestor instanceof ViewGroup) { 4854 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4855 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4856 return true; 4857 } else { 4858 ancestor = vgAncestor.getParent(); 4859 } 4860 } 4861 return false; 4862 } 4863 4864 /** 4865 * @hide 4866 */ 4867 public void dispatchStartTemporaryDetach() { 4868 onStartTemporaryDetach(); 4869 } 4870 4871 /** 4872 * This is called when a container is going to temporarily detach a child, with 4873 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4874 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4875 * {@link #onDetachedFromWindow()} when the container is done. 4876 */ 4877 public void onStartTemporaryDetach() { 4878 removeUnsetPressCallback(); 4879 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4880 } 4881 4882 /** 4883 * @hide 4884 */ 4885 public void dispatchFinishTemporaryDetach() { 4886 onFinishTemporaryDetach(); 4887 } 4888 4889 /** 4890 * Called after {@link #onStartTemporaryDetach} when the container is done 4891 * changing the view. 4892 */ 4893 public void onFinishTemporaryDetach() { 4894 } 4895 4896 /** 4897 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4898 * for this view's window. Returns null if the view is not currently attached 4899 * to the window. Normally you will not need to use this directly, but 4900 * just use the standard high-level event callbacks like 4901 * {@link #onKeyDown(int, KeyEvent)}. 4902 */ 4903 public KeyEvent.DispatcherState getKeyDispatcherState() { 4904 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4905 } 4906 4907 /** 4908 * Dispatch a key event before it is processed by any input method 4909 * associated with the view hierarchy. This can be used to intercept 4910 * key events in special situations before the IME consumes them; a 4911 * typical example would be handling the BACK key to update the application's 4912 * UI instead of allowing the IME to see it and close itself. 4913 * 4914 * @param event The key event to be dispatched. 4915 * @return True if the event was handled, false otherwise. 4916 */ 4917 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4918 return onKeyPreIme(event.getKeyCode(), event); 4919 } 4920 4921 /** 4922 * Dispatch a key event to the next view on the focus path. This path runs 4923 * from the top of the view tree down to the currently focused view. If this 4924 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4925 * the next node down the focus path. This method also fires any key 4926 * listeners. 4927 * 4928 * @param event The key event to be dispatched. 4929 * @return True if the event was handled, false otherwise. 4930 */ 4931 public boolean dispatchKeyEvent(KeyEvent event) { 4932 if (mInputEventConsistencyVerifier != null) { 4933 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 4934 } 4935 4936 // Give any attached key listener a first crack at the event. 4937 //noinspection SimplifiableIfStatement 4938 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4939 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4940 return true; 4941 } 4942 4943 if (event.dispatch(this, mAttachInfo != null 4944 ? mAttachInfo.mKeyDispatchState : null, this)) { 4945 return true; 4946 } 4947 4948 if (mInputEventConsistencyVerifier != null) { 4949 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 4950 } 4951 return false; 4952 } 4953 4954 /** 4955 * Dispatches a key shortcut event. 4956 * 4957 * @param event The key event to be dispatched. 4958 * @return True if the event was handled by the view, false otherwise. 4959 */ 4960 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4961 return onKeyShortcut(event.getKeyCode(), event); 4962 } 4963 4964 /** 4965 * Pass the touch screen motion event down to the target view, or this 4966 * view if it is the target. 4967 * 4968 * @param event The motion event to be dispatched. 4969 * @return True if the event was handled by the view, false otherwise. 4970 */ 4971 public boolean dispatchTouchEvent(MotionEvent event) { 4972 if (mInputEventConsistencyVerifier != null) { 4973 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 4974 } 4975 4976 if (onFilterTouchEventForSecurity(event)) { 4977 //noinspection SimplifiableIfStatement 4978 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4979 mOnTouchListener.onTouch(this, event)) { 4980 return true; 4981 } 4982 4983 if (onTouchEvent(event)) { 4984 return true; 4985 } 4986 } 4987 4988 if (mInputEventConsistencyVerifier != null) { 4989 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 4990 } 4991 return false; 4992 } 4993 4994 /** 4995 * Filter the touch event to apply security policies. 4996 * 4997 * @param event The motion event to be filtered. 4998 * @return True if the event should be dispatched, false if the event should be dropped. 4999 * 5000 * @see #getFilterTouchesWhenObscured 5001 */ 5002 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5003 //noinspection RedundantIfStatement 5004 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5005 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5006 // Window is obscured, drop this touch. 5007 return false; 5008 } 5009 return true; 5010 } 5011 5012 /** 5013 * Pass a trackball motion event down to the focused view. 5014 * 5015 * @param event The motion event to be dispatched. 5016 * @return True if the event was handled by the view, false otherwise. 5017 */ 5018 public boolean dispatchTrackballEvent(MotionEvent event) { 5019 if (mInputEventConsistencyVerifier != null) { 5020 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5021 } 5022 5023 //Log.i("view", "view=" + this + ", " + event.toString()); 5024 if (onTrackballEvent(event)) { 5025 return true; 5026 } 5027 5028 if (mInputEventConsistencyVerifier != null) { 5029 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5030 } 5031 return false; 5032 } 5033 5034 /** 5035 * Dispatch a generic motion event. 5036 * <p> 5037 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5038 * are delivered to the view under the pointer. All other generic motion events are 5039 * delivered to the focused view. Hover events are handled specially and are delivered 5040 * to {@link #onHoverEvent(MotionEvent)}. 5041 * </p> 5042 * 5043 * @param event The motion event to be dispatched. 5044 * @return True if the event was handled by the view, false otherwise. 5045 */ 5046 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5047 if (mInputEventConsistencyVerifier != null) { 5048 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5049 } 5050 5051 final int source = event.getSource(); 5052 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5053 final int action = event.getAction(); 5054 if (action == MotionEvent.ACTION_HOVER_ENTER 5055 || action == MotionEvent.ACTION_HOVER_MOVE 5056 || action == MotionEvent.ACTION_HOVER_EXIT) { 5057 if (dispatchHoverEvent(event)) { 5058 return true; 5059 } 5060 } else if (dispatchGenericPointerEvent(event)) { 5061 return true; 5062 } 5063 } else if (dispatchGenericFocusedEvent(event)) { 5064 return true; 5065 } 5066 5067 //noinspection SimplifiableIfStatement 5068 if (mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5069 && mOnGenericMotionListener.onGenericMotion(this, event)) { 5070 return true; 5071 } 5072 5073 if (onGenericMotionEvent(event)) { 5074 return true; 5075 } 5076 5077 if (mInputEventConsistencyVerifier != null) { 5078 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5079 } 5080 return false; 5081 } 5082 5083 /** 5084 * Dispatch a hover event. 5085 * <p> 5086 * Do not call this method directly. 5087 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5088 * </p> 5089 * 5090 * @param event The motion event to be dispatched. 5091 * @return True if the event was handled by the view, false otherwise. 5092 * @hide 5093 */ 5094 protected boolean dispatchHoverEvent(MotionEvent event) { 5095 return onHoverEvent(event); 5096 } 5097 5098 /** 5099 * Dispatch a generic motion event to the view under the first pointer. 5100 * <p> 5101 * Do not call this method directly. 5102 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5103 * </p> 5104 * 5105 * @param event The motion event to be dispatched. 5106 * @return True if the event was handled by the view, false otherwise. 5107 * @hide 5108 */ 5109 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5110 return false; 5111 } 5112 5113 /** 5114 * Dispatch a generic motion event to the currently focused view. 5115 * <p> 5116 * Do not call this method directly. 5117 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5118 * </p> 5119 * 5120 * @param event The motion event to be dispatched. 5121 * @return True if the event was handled by the view, false otherwise. 5122 * @hide 5123 */ 5124 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5125 return false; 5126 } 5127 5128 /** 5129 * Dispatch a pointer event. 5130 * <p> 5131 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5132 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5133 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5134 * and should not be expected to handle other pointing device features. 5135 * </p> 5136 * 5137 * @param event The motion event to be dispatched. 5138 * @return True if the event was handled by the view, false otherwise. 5139 * @hide 5140 */ 5141 public final boolean dispatchPointerEvent(MotionEvent event) { 5142 if (event.isTouchEvent()) { 5143 return dispatchTouchEvent(event); 5144 } else { 5145 return dispatchGenericMotionEvent(event); 5146 } 5147 } 5148 5149 /** 5150 * Called when the window containing this view gains or loses window focus. 5151 * ViewGroups should override to route to their children. 5152 * 5153 * @param hasFocus True if the window containing this view now has focus, 5154 * false otherwise. 5155 */ 5156 public void dispatchWindowFocusChanged(boolean hasFocus) { 5157 onWindowFocusChanged(hasFocus); 5158 } 5159 5160 /** 5161 * Called when the window containing this view gains or loses focus. Note 5162 * that this is separate from view focus: to receive key events, both 5163 * your view and its window must have focus. If a window is displayed 5164 * on top of yours that takes input focus, then your own window will lose 5165 * focus but the view focus will remain unchanged. 5166 * 5167 * @param hasWindowFocus True if the window containing this view now has 5168 * focus, false otherwise. 5169 */ 5170 public void onWindowFocusChanged(boolean hasWindowFocus) { 5171 InputMethodManager imm = InputMethodManager.peekInstance(); 5172 if (!hasWindowFocus) { 5173 if (isPressed()) { 5174 setPressed(false); 5175 } 5176 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5177 imm.focusOut(this); 5178 } 5179 removeLongPressCallback(); 5180 removeTapCallback(); 5181 onFocusLost(); 5182 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5183 imm.focusIn(this); 5184 } 5185 refreshDrawableState(); 5186 } 5187 5188 /** 5189 * Returns true if this view is in a window that currently has window focus. 5190 * Note that this is not the same as the view itself having focus. 5191 * 5192 * @return True if this view is in a window that currently has window focus. 5193 */ 5194 public boolean hasWindowFocus() { 5195 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5196 } 5197 5198 /** 5199 * Dispatch a view visibility change down the view hierarchy. 5200 * ViewGroups should override to route to their children. 5201 * @param changedView The view whose visibility changed. Could be 'this' or 5202 * an ancestor view. 5203 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5204 * {@link #INVISIBLE} or {@link #GONE}. 5205 */ 5206 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5207 onVisibilityChanged(changedView, visibility); 5208 } 5209 5210 /** 5211 * Called when the visibility of the view or an ancestor of the view is changed. 5212 * @param changedView The view whose visibility changed. Could be 'this' or 5213 * an ancestor view. 5214 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5215 * {@link #INVISIBLE} or {@link #GONE}. 5216 */ 5217 protected void onVisibilityChanged(View changedView, int visibility) { 5218 if (visibility == VISIBLE) { 5219 if (mAttachInfo != null) { 5220 initialAwakenScrollBars(); 5221 } else { 5222 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5223 } 5224 } 5225 } 5226 5227 /** 5228 * Dispatch a hint about whether this view is displayed. For instance, when 5229 * a View moves out of the screen, it might receives a display hint indicating 5230 * the view is not displayed. Applications should not <em>rely</em> on this hint 5231 * as there is no guarantee that they will receive one. 5232 * 5233 * @param hint A hint about whether or not this view is displayed: 5234 * {@link #VISIBLE} or {@link #INVISIBLE}. 5235 */ 5236 public void dispatchDisplayHint(int hint) { 5237 onDisplayHint(hint); 5238 } 5239 5240 /** 5241 * Gives this view a hint about whether is displayed or not. For instance, when 5242 * a View moves out of the screen, it might receives a display hint indicating 5243 * the view is not displayed. Applications should not <em>rely</em> on this hint 5244 * as there is no guarantee that they will receive one. 5245 * 5246 * @param hint A hint about whether or not this view is displayed: 5247 * {@link #VISIBLE} or {@link #INVISIBLE}. 5248 */ 5249 protected void onDisplayHint(int hint) { 5250 } 5251 5252 /** 5253 * Dispatch a window visibility change down the view hierarchy. 5254 * ViewGroups should override to route to their children. 5255 * 5256 * @param visibility The new visibility of the window. 5257 * 5258 * @see #onWindowVisibilityChanged(int) 5259 */ 5260 public void dispatchWindowVisibilityChanged(int visibility) { 5261 onWindowVisibilityChanged(visibility); 5262 } 5263 5264 /** 5265 * Called when the window containing has change its visibility 5266 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5267 * that this tells you whether or not your window is being made visible 5268 * to the window manager; this does <em>not</em> tell you whether or not 5269 * your window is obscured by other windows on the screen, even if it 5270 * is itself visible. 5271 * 5272 * @param visibility The new visibility of the window. 5273 */ 5274 protected void onWindowVisibilityChanged(int visibility) { 5275 if (visibility == VISIBLE) { 5276 initialAwakenScrollBars(); 5277 } 5278 } 5279 5280 /** 5281 * Returns the current visibility of the window this view is attached to 5282 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 5283 * 5284 * @return Returns the current visibility of the view's window. 5285 */ 5286 public int getWindowVisibility() { 5287 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 5288 } 5289 5290 /** 5291 * Retrieve the overall visible display size in which the window this view is 5292 * attached to has been positioned in. This takes into account screen 5293 * decorations above the window, for both cases where the window itself 5294 * is being position inside of them or the window is being placed under 5295 * then and covered insets are used for the window to position its content 5296 * inside. In effect, this tells you the available area where content can 5297 * be placed and remain visible to users. 5298 * 5299 * <p>This function requires an IPC back to the window manager to retrieve 5300 * the requested information, so should not be used in performance critical 5301 * code like drawing. 5302 * 5303 * @param outRect Filled in with the visible display frame. If the view 5304 * is not attached to a window, this is simply the raw display size. 5305 */ 5306 public void getWindowVisibleDisplayFrame(Rect outRect) { 5307 if (mAttachInfo != null) { 5308 try { 5309 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 5310 } catch (RemoteException e) { 5311 return; 5312 } 5313 // XXX This is really broken, and probably all needs to be done 5314 // in the window manager, and we need to know more about whether 5315 // we want the area behind or in front of the IME. 5316 final Rect insets = mAttachInfo.mVisibleInsets; 5317 outRect.left += insets.left; 5318 outRect.top += insets.top; 5319 outRect.right -= insets.right; 5320 outRect.bottom -= insets.bottom; 5321 return; 5322 } 5323 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 5324 d.getRectSize(outRect); 5325 } 5326 5327 /** 5328 * Dispatch a notification about a resource configuration change down 5329 * the view hierarchy. 5330 * ViewGroups should override to route to their children. 5331 * 5332 * @param newConfig The new resource configuration. 5333 * 5334 * @see #onConfigurationChanged(android.content.res.Configuration) 5335 */ 5336 public void dispatchConfigurationChanged(Configuration newConfig) { 5337 onConfigurationChanged(newConfig); 5338 } 5339 5340 /** 5341 * Called when the current configuration of the resources being used 5342 * by the application have changed. You can use this to decide when 5343 * to reload resources that can changed based on orientation and other 5344 * configuration characterstics. You only need to use this if you are 5345 * not relying on the normal {@link android.app.Activity} mechanism of 5346 * recreating the activity instance upon a configuration change. 5347 * 5348 * @param newConfig The new resource configuration. 5349 */ 5350 protected void onConfigurationChanged(Configuration newConfig) { 5351 } 5352 5353 /** 5354 * Private function to aggregate all per-view attributes in to the view 5355 * root. 5356 */ 5357 void dispatchCollectViewAttributes(int visibility) { 5358 performCollectViewAttributes(visibility); 5359 } 5360 5361 void performCollectViewAttributes(int visibility) { 5362 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 5363 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 5364 mAttachInfo.mKeepScreenOn = true; 5365 } 5366 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 5367 if (mOnSystemUiVisibilityChangeListener != null) { 5368 mAttachInfo.mHasSystemUiListeners = true; 5369 } 5370 } 5371 } 5372 5373 void needGlobalAttributesUpdate(boolean force) { 5374 final AttachInfo ai = mAttachInfo; 5375 if (ai != null) { 5376 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 5377 || ai.mHasSystemUiListeners) { 5378 ai.mRecomputeGlobalAttributes = true; 5379 } 5380 } 5381 } 5382 5383 /** 5384 * Returns whether the device is currently in touch mode. Touch mode is entered 5385 * once the user begins interacting with the device by touch, and affects various 5386 * things like whether focus is always visible to the user. 5387 * 5388 * @return Whether the device is in touch mode. 5389 */ 5390 @ViewDebug.ExportedProperty 5391 public boolean isInTouchMode() { 5392 if (mAttachInfo != null) { 5393 return mAttachInfo.mInTouchMode; 5394 } else { 5395 return ViewAncestor.isInTouchMode(); 5396 } 5397 } 5398 5399 /** 5400 * Returns the context the view is running in, through which it can 5401 * access the current theme, resources, etc. 5402 * 5403 * @return The view's Context. 5404 */ 5405 @ViewDebug.CapturedViewProperty 5406 public final Context getContext() { 5407 return mContext; 5408 } 5409 5410 /** 5411 * Handle a key event before it is processed by any input method 5412 * associated with the view hierarchy. This can be used to intercept 5413 * key events in special situations before the IME consumes them; a 5414 * typical example would be handling the BACK key to update the application's 5415 * UI instead of allowing the IME to see it and close itself. 5416 * 5417 * @param keyCode The value in event.getKeyCode(). 5418 * @param event Description of the key event. 5419 * @return If you handled the event, return true. If you want to allow the 5420 * event to be handled by the next receiver, return false. 5421 */ 5422 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 5423 return false; 5424 } 5425 5426 /** 5427 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 5428 * KeyEvent.Callback.onKeyDown()}: perform press of the view 5429 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 5430 * is released, if the view is enabled and clickable. 5431 * 5432 * @param keyCode A key code that represents the button pressed, from 5433 * {@link android.view.KeyEvent}. 5434 * @param event The KeyEvent object that defines the button action. 5435 */ 5436 public boolean onKeyDown(int keyCode, KeyEvent event) { 5437 boolean result = false; 5438 5439 switch (keyCode) { 5440 case KeyEvent.KEYCODE_DPAD_CENTER: 5441 case KeyEvent.KEYCODE_ENTER: { 5442 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5443 return true; 5444 } 5445 // Long clickable items don't necessarily have to be clickable 5446 if (((mViewFlags & CLICKABLE) == CLICKABLE || 5447 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 5448 (event.getRepeatCount() == 0)) { 5449 setPressed(true); 5450 checkForLongClick(0); 5451 return true; 5452 } 5453 break; 5454 } 5455 } 5456 return result; 5457 } 5458 5459 /** 5460 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 5461 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 5462 * the event). 5463 */ 5464 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 5465 return false; 5466 } 5467 5468 /** 5469 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 5470 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 5471 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 5472 * {@link KeyEvent#KEYCODE_ENTER} is released. 5473 * 5474 * @param keyCode A key code that represents the button pressed, from 5475 * {@link android.view.KeyEvent}. 5476 * @param event The KeyEvent object that defines the button action. 5477 */ 5478 public boolean onKeyUp(int keyCode, KeyEvent event) { 5479 boolean result = false; 5480 5481 switch (keyCode) { 5482 case KeyEvent.KEYCODE_DPAD_CENTER: 5483 case KeyEvent.KEYCODE_ENTER: { 5484 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5485 return true; 5486 } 5487 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 5488 setPressed(false); 5489 5490 if (!mHasPerformedLongPress) { 5491 // This is a tap, so remove the longpress check 5492 removeLongPressCallback(); 5493 5494 result = performClick(); 5495 } 5496 } 5497 break; 5498 } 5499 } 5500 return result; 5501 } 5502 5503 /** 5504 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 5505 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 5506 * the event). 5507 * 5508 * @param keyCode A key code that represents the button pressed, from 5509 * {@link android.view.KeyEvent}. 5510 * @param repeatCount The number of times the action was made. 5511 * @param event The KeyEvent object that defines the button action. 5512 */ 5513 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 5514 return false; 5515 } 5516 5517 /** 5518 * Called on the focused view when a key shortcut event is not handled. 5519 * Override this method to implement local key shortcuts for the View. 5520 * Key shortcuts can also be implemented by setting the 5521 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 5522 * 5523 * @param keyCode The value in event.getKeyCode(). 5524 * @param event Description of the key event. 5525 * @return If you handled the event, return true. If you want to allow the 5526 * event to be handled by the next receiver, return false. 5527 */ 5528 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 5529 return false; 5530 } 5531 5532 /** 5533 * Check whether the called view is a text editor, in which case it 5534 * would make sense to automatically display a soft input window for 5535 * it. Subclasses should override this if they implement 5536 * {@link #onCreateInputConnection(EditorInfo)} to return true if 5537 * a call on that method would return a non-null InputConnection, and 5538 * they are really a first-class editor that the user would normally 5539 * start typing on when the go into a window containing your view. 5540 * 5541 * <p>The default implementation always returns false. This does 5542 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 5543 * will not be called or the user can not otherwise perform edits on your 5544 * view; it is just a hint to the system that this is not the primary 5545 * purpose of this view. 5546 * 5547 * @return Returns true if this view is a text editor, else false. 5548 */ 5549 public boolean onCheckIsTextEditor() { 5550 return false; 5551 } 5552 5553 /** 5554 * Create a new InputConnection for an InputMethod to interact 5555 * with the view. The default implementation returns null, since it doesn't 5556 * support input methods. You can override this to implement such support. 5557 * This is only needed for views that take focus and text input. 5558 * 5559 * <p>When implementing this, you probably also want to implement 5560 * {@link #onCheckIsTextEditor()} to indicate you will return a 5561 * non-null InputConnection. 5562 * 5563 * @param outAttrs Fill in with attribute information about the connection. 5564 */ 5565 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 5566 return null; 5567 } 5568 5569 /** 5570 * Called by the {@link android.view.inputmethod.InputMethodManager} 5571 * when a view who is not the current 5572 * input connection target is trying to make a call on the manager. The 5573 * default implementation returns false; you can override this to return 5574 * true for certain views if you are performing InputConnection proxying 5575 * to them. 5576 * @param view The View that is making the InputMethodManager call. 5577 * @return Return true to allow the call, false to reject. 5578 */ 5579 public boolean checkInputConnectionProxy(View view) { 5580 return false; 5581 } 5582 5583 /** 5584 * Show the context menu for this view. It is not safe to hold on to the 5585 * menu after returning from this method. 5586 * 5587 * You should normally not overload this method. Overload 5588 * {@link #onCreateContextMenu(ContextMenu)} or define an 5589 * {@link OnCreateContextMenuListener} to add items to the context menu. 5590 * 5591 * @param menu The context menu to populate 5592 */ 5593 public void createContextMenu(ContextMenu menu) { 5594 ContextMenuInfo menuInfo = getContextMenuInfo(); 5595 5596 // Sets the current menu info so all items added to menu will have 5597 // my extra info set. 5598 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 5599 5600 onCreateContextMenu(menu); 5601 if (mOnCreateContextMenuListener != null) { 5602 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 5603 } 5604 5605 // Clear the extra information so subsequent items that aren't mine don't 5606 // have my extra info. 5607 ((MenuBuilder)menu).setCurrentMenuInfo(null); 5608 5609 if (mParent != null) { 5610 mParent.createContextMenu(menu); 5611 } 5612 } 5613 5614 /** 5615 * Views should implement this if they have extra information to associate 5616 * with the context menu. The return result is supplied as a parameter to 5617 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 5618 * callback. 5619 * 5620 * @return Extra information about the item for which the context menu 5621 * should be shown. This information will vary across different 5622 * subclasses of View. 5623 */ 5624 protected ContextMenuInfo getContextMenuInfo() { 5625 return null; 5626 } 5627 5628 /** 5629 * Views should implement this if the view itself is going to add items to 5630 * the context menu. 5631 * 5632 * @param menu the context menu to populate 5633 */ 5634 protected void onCreateContextMenu(ContextMenu menu) { 5635 } 5636 5637 /** 5638 * Implement this method to handle trackball motion events. The 5639 * <em>relative</em> movement of the trackball since the last event 5640 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 5641 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 5642 * that a movement of 1 corresponds to the user pressing one DPAD key (so 5643 * they will often be fractional values, representing the more fine-grained 5644 * movement information available from a trackball). 5645 * 5646 * @param event The motion event. 5647 * @return True if the event was handled, false otherwise. 5648 */ 5649 public boolean onTrackballEvent(MotionEvent event) { 5650 return false; 5651 } 5652 5653 /** 5654 * Implement this method to handle generic motion events. 5655 * <p> 5656 * Generic motion events describe joystick movements, mouse hovers, track pad 5657 * touches, scroll wheel movements and other input events. The 5658 * {@link MotionEvent#getSource() source} of the motion event specifies 5659 * the class of input that was received. Implementations of this method 5660 * must examine the bits in the source before processing the event. 5661 * The following code example shows how this is done. 5662 * </p><p> 5663 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5664 * are delivered to the view under the pointer. All other generic motion events are 5665 * delivered to the focused view. 5666 * </p> 5667 * <code> 5668 * public boolean onGenericMotionEvent(MotionEvent event) { 5669 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 5670 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 5671 * // process the joystick movement... 5672 * return true; 5673 * } 5674 * } 5675 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5676 * switch (event.getAction()) { 5677 * case MotionEvent.ACTION_HOVER_MOVE: 5678 * // process the mouse hover movement... 5679 * return true; 5680 * case MotionEvent.ACTION_SCROLL: 5681 * // process the scroll wheel movement... 5682 * return true; 5683 * } 5684 * } 5685 * return super.onGenericMotionEvent(event); 5686 * } 5687 * </code> 5688 * 5689 * @param event The generic motion event being processed. 5690 * @return True if the event was handled, false otherwise. 5691 */ 5692 public boolean onGenericMotionEvent(MotionEvent event) { 5693 return false; 5694 } 5695 5696 /** 5697 * Implement this method to handle hover events. 5698 * <p> 5699 * Hover events are pointer events with action {@link MotionEvent#ACTION_HOVER_ENTER}, 5700 * {@link MotionEvent#ACTION_HOVER_MOVE}, or {@link MotionEvent#ACTION_HOVER_EXIT}. 5701 * </p><p> 5702 * The view receives hover enter as the pointer enters the bounds of the view and hover 5703 * exit as the pointer exits the bound of the view or just before the pointer goes down 5704 * (which implies that {@link #onTouchEvent(MotionEvent)} will be called soon). 5705 * </p><p> 5706 * If the view would like to handle the hover event itself and prevent its children 5707 * from receiving hover, it should return true from this method. If this method returns 5708 * true and a child has already received a hover enter event, the child will 5709 * automatically receive a hover exit event. 5710 * </p><p> 5711 * The default implementation sets the hovered state of the view if the view is 5712 * clickable. 5713 * </p> 5714 * 5715 * @param event The motion event that describes the hover. 5716 * @return True if this view handled the hover event and does not want its children 5717 * to receive the hover event. 5718 */ 5719 public boolean onHoverEvent(MotionEvent event) { 5720 switch (event.getAction()) { 5721 case MotionEvent.ACTION_HOVER_ENTER: 5722 setHovered(true); 5723 break; 5724 5725 case MotionEvent.ACTION_HOVER_EXIT: 5726 setHovered(false); 5727 break; 5728 } 5729 5730 return false; 5731 } 5732 5733 /** 5734 * Returns true if the view is currently hovered. 5735 * 5736 * @return True if the view is currently hovered. 5737 */ 5738 public boolean isHovered() { 5739 return (mPrivateFlags & HOVERED) != 0; 5740 } 5741 5742 /** 5743 * Sets whether the view is currently hovered. 5744 * 5745 * @param hovered True if the view is hovered. 5746 */ 5747 public void setHovered(boolean hovered) { 5748 if (hovered) { 5749 if ((mPrivateFlags & HOVERED) == 0) { 5750 mPrivateFlags |= HOVERED; 5751 refreshDrawableState(); 5752 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 5753 } 5754 } else { 5755 if ((mPrivateFlags & HOVERED) != 0) { 5756 mPrivateFlags &= ~HOVERED; 5757 refreshDrawableState(); 5758 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 5759 } 5760 } 5761 } 5762 5763 /** 5764 * Implement this method to handle touch screen motion events. 5765 * 5766 * @param event The motion event. 5767 * @return True if the event was handled, false otherwise. 5768 */ 5769 public boolean onTouchEvent(MotionEvent event) { 5770 final int viewFlags = mViewFlags; 5771 5772 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5773 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 5774 mPrivateFlags &= ~PRESSED; 5775 refreshDrawableState(); 5776 } 5777 // A disabled view that is clickable still consumes the touch 5778 // events, it just doesn't respond to them. 5779 return (((viewFlags & CLICKABLE) == CLICKABLE || 5780 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5781 } 5782 5783 if (mTouchDelegate != null) { 5784 if (mTouchDelegate.onTouchEvent(event)) { 5785 return true; 5786 } 5787 } 5788 5789 if (((viewFlags & CLICKABLE) == CLICKABLE || 5790 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5791 switch (event.getAction()) { 5792 case MotionEvent.ACTION_UP: 5793 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5794 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5795 // take focus if we don't have it already and we should in 5796 // touch mode. 5797 boolean focusTaken = false; 5798 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5799 focusTaken = requestFocus(); 5800 } 5801 5802 if (prepressed) { 5803 // The button is being released before we actually 5804 // showed it as pressed. Make it show the pressed 5805 // state now (before scheduling the click) to ensure 5806 // the user sees it. 5807 mPrivateFlags |= PRESSED; 5808 refreshDrawableState(); 5809 } 5810 5811 if (!mHasPerformedLongPress) { 5812 // This is a tap, so remove the longpress check 5813 removeLongPressCallback(); 5814 5815 // Only perform take click actions if we were in the pressed state 5816 if (!focusTaken) { 5817 // Use a Runnable and post this rather than calling 5818 // performClick directly. This lets other visual state 5819 // of the view update before click actions start. 5820 if (mPerformClick == null) { 5821 mPerformClick = new PerformClick(); 5822 } 5823 if (!post(mPerformClick)) { 5824 performClick(); 5825 } 5826 } 5827 } 5828 5829 if (mUnsetPressedState == null) { 5830 mUnsetPressedState = new UnsetPressedState(); 5831 } 5832 5833 if (prepressed) { 5834 postDelayed(mUnsetPressedState, 5835 ViewConfiguration.getPressedStateDuration()); 5836 } else if (!post(mUnsetPressedState)) { 5837 // If the post failed, unpress right now 5838 mUnsetPressedState.run(); 5839 } 5840 removeTapCallback(); 5841 } 5842 break; 5843 5844 case MotionEvent.ACTION_DOWN: 5845 mHasPerformedLongPress = false; 5846 5847 if (performButtonActionOnTouchDown(event)) { 5848 break; 5849 } 5850 5851 // Walk up the hierarchy to determine if we're inside a scrolling container. 5852 boolean isInScrollingContainer = false; 5853 ViewParent p = getParent(); 5854 while (p != null && p instanceof ViewGroup) { 5855 if (((ViewGroup) p).shouldDelayChildPressedState()) { 5856 isInScrollingContainer = true; 5857 break; 5858 } 5859 p = p.getParent(); 5860 } 5861 5862 // For views inside a scrolling container, delay the pressed feedback for 5863 // a short period in case this is a scroll. 5864 if (isInScrollingContainer) { 5865 mPrivateFlags |= PREPRESSED; 5866 if (mPendingCheckForTap == null) { 5867 mPendingCheckForTap = new CheckForTap(); 5868 } 5869 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5870 } else { 5871 // Not inside a scrolling container, so show the feedback right away 5872 mPrivateFlags |= PRESSED; 5873 refreshDrawableState(); 5874 checkForLongClick(0); 5875 } 5876 break; 5877 5878 case MotionEvent.ACTION_CANCEL: 5879 mPrivateFlags &= ~PRESSED; 5880 refreshDrawableState(); 5881 removeTapCallback(); 5882 break; 5883 5884 case MotionEvent.ACTION_MOVE: 5885 final int x = (int) event.getX(); 5886 final int y = (int) event.getY(); 5887 5888 // Be lenient about moving outside of buttons 5889 if (!pointInView(x, y, mTouchSlop)) { 5890 // Outside button 5891 removeTapCallback(); 5892 if ((mPrivateFlags & PRESSED) != 0) { 5893 // Remove any future long press/tap checks 5894 removeLongPressCallback(); 5895 5896 // Need to switch from pressed to not pressed 5897 mPrivateFlags &= ~PRESSED; 5898 refreshDrawableState(); 5899 } 5900 } 5901 break; 5902 } 5903 return true; 5904 } 5905 5906 return false; 5907 } 5908 5909 /** 5910 * Remove the longpress detection timer. 5911 */ 5912 private void removeLongPressCallback() { 5913 if (mPendingCheckForLongPress != null) { 5914 removeCallbacks(mPendingCheckForLongPress); 5915 } 5916 } 5917 5918 /** 5919 * Remove the pending click action 5920 */ 5921 private void removePerformClickCallback() { 5922 if (mPerformClick != null) { 5923 removeCallbacks(mPerformClick); 5924 } 5925 } 5926 5927 /** 5928 * Remove the prepress detection timer. 5929 */ 5930 private void removeUnsetPressCallback() { 5931 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5932 setPressed(false); 5933 removeCallbacks(mUnsetPressedState); 5934 } 5935 } 5936 5937 /** 5938 * Remove the tap detection timer. 5939 */ 5940 private void removeTapCallback() { 5941 if (mPendingCheckForTap != null) { 5942 mPrivateFlags &= ~PREPRESSED; 5943 removeCallbacks(mPendingCheckForTap); 5944 } 5945 } 5946 5947 /** 5948 * Cancels a pending long press. Your subclass can use this if you 5949 * want the context menu to come up if the user presses and holds 5950 * at the same place, but you don't want it to come up if they press 5951 * and then move around enough to cause scrolling. 5952 */ 5953 public void cancelLongPress() { 5954 removeLongPressCallback(); 5955 5956 /* 5957 * The prepressed state handled by the tap callback is a display 5958 * construct, but the tap callback will post a long press callback 5959 * less its own timeout. Remove it here. 5960 */ 5961 removeTapCallback(); 5962 } 5963 5964 /** 5965 * Sets the TouchDelegate for this View. 5966 */ 5967 public void setTouchDelegate(TouchDelegate delegate) { 5968 mTouchDelegate = delegate; 5969 } 5970 5971 /** 5972 * Gets the TouchDelegate for this View. 5973 */ 5974 public TouchDelegate getTouchDelegate() { 5975 return mTouchDelegate; 5976 } 5977 5978 /** 5979 * Set flags controlling behavior of this view. 5980 * 5981 * @param flags Constant indicating the value which should be set 5982 * @param mask Constant indicating the bit range that should be changed 5983 */ 5984 void setFlags(int flags, int mask) { 5985 int old = mViewFlags; 5986 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5987 5988 int changed = mViewFlags ^ old; 5989 if (changed == 0) { 5990 return; 5991 } 5992 int privateFlags = mPrivateFlags; 5993 5994 /* Check if the FOCUSABLE bit has changed */ 5995 if (((changed & FOCUSABLE_MASK) != 0) && 5996 ((privateFlags & HAS_BOUNDS) !=0)) { 5997 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5998 && ((privateFlags & FOCUSED) != 0)) { 5999 /* Give up focus if we are no longer focusable */ 6000 clearFocus(); 6001 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6002 && ((privateFlags & FOCUSED) == 0)) { 6003 /* 6004 * Tell the view system that we are now available to take focus 6005 * if no one else already has it. 6006 */ 6007 if (mParent != null) mParent.focusableViewAvailable(this); 6008 } 6009 } 6010 6011 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6012 if ((changed & VISIBILITY_MASK) != 0) { 6013 /* 6014 * If this view is becoming visible, set the DRAWN flag so that 6015 * the next invalidate() will not be skipped. 6016 */ 6017 mPrivateFlags |= DRAWN; 6018 6019 needGlobalAttributesUpdate(true); 6020 6021 // a view becoming visible is worth notifying the parent 6022 // about in case nothing has focus. even if this specific view 6023 // isn't focusable, it may contain something that is, so let 6024 // the root view try to give this focus if nothing else does. 6025 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6026 mParent.focusableViewAvailable(this); 6027 } 6028 } 6029 } 6030 6031 /* Check if the GONE bit has changed */ 6032 if ((changed & GONE) != 0) { 6033 needGlobalAttributesUpdate(false); 6034 requestLayout(); 6035 invalidate(true); 6036 6037 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6038 if (hasFocus()) clearFocus(); 6039 destroyDrawingCache(); 6040 } 6041 if (mAttachInfo != null) { 6042 mAttachInfo.mViewVisibilityChanged = true; 6043 } 6044 } 6045 6046 /* Check if the VISIBLE bit has changed */ 6047 if ((changed & INVISIBLE) != 0) { 6048 needGlobalAttributesUpdate(false); 6049 invalidate(true); 6050 6051 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6052 // root view becoming invisible shouldn't clear focus 6053 if (getRootView() != this) { 6054 clearFocus(); 6055 } 6056 } 6057 if (mAttachInfo != null) { 6058 mAttachInfo.mViewVisibilityChanged = true; 6059 } 6060 } 6061 6062 if ((changed & VISIBILITY_MASK) != 0) { 6063 if (mParent instanceof ViewGroup) { 6064 ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6065 ((View) mParent).invalidate(true); 6066 } 6067 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6068 } 6069 6070 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6071 destroyDrawingCache(); 6072 } 6073 6074 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6075 destroyDrawingCache(); 6076 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6077 invalidateParentCaches(); 6078 } 6079 6080 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6081 destroyDrawingCache(); 6082 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6083 } 6084 6085 if ((changed & DRAW_MASK) != 0) { 6086 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6087 if (mBGDrawable != null) { 6088 mPrivateFlags &= ~SKIP_DRAW; 6089 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6090 } else { 6091 mPrivateFlags |= SKIP_DRAW; 6092 } 6093 } else { 6094 mPrivateFlags &= ~SKIP_DRAW; 6095 } 6096 requestLayout(); 6097 invalidate(true); 6098 } 6099 6100 if ((changed & KEEP_SCREEN_ON) != 0) { 6101 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6102 mParent.recomputeViewAttributes(this); 6103 } 6104 } 6105 6106 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6107 requestLayout(); 6108 } 6109 } 6110 6111 /** 6112 * Change the view's z order in the tree, so it's on top of other sibling 6113 * views 6114 */ 6115 public void bringToFront() { 6116 if (mParent != null) { 6117 mParent.bringChildToFront(this); 6118 } 6119 } 6120 6121 /** 6122 * This is called in response to an internal scroll in this view (i.e., the 6123 * view scrolled its own contents). This is typically as a result of 6124 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6125 * called. 6126 * 6127 * @param l Current horizontal scroll origin. 6128 * @param t Current vertical scroll origin. 6129 * @param oldl Previous horizontal scroll origin. 6130 * @param oldt Previous vertical scroll origin. 6131 */ 6132 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6133 mBackgroundSizeChanged = true; 6134 6135 final AttachInfo ai = mAttachInfo; 6136 if (ai != null) { 6137 ai.mViewScrollChanged = true; 6138 } 6139 } 6140 6141 /** 6142 * Interface definition for a callback to be invoked when the layout bounds of a view 6143 * changes due to layout processing. 6144 */ 6145 public interface OnLayoutChangeListener { 6146 /** 6147 * Called when the focus state of a view has changed. 6148 * 6149 * @param v The view whose state has changed. 6150 * @param left The new value of the view's left property. 6151 * @param top The new value of the view's top property. 6152 * @param right The new value of the view's right property. 6153 * @param bottom The new value of the view's bottom property. 6154 * @param oldLeft The previous value of the view's left property. 6155 * @param oldTop The previous value of the view's top property. 6156 * @param oldRight The previous value of the view's right property. 6157 * @param oldBottom The previous value of the view's bottom property. 6158 */ 6159 void onLayoutChange(View v, int left, int top, int right, int bottom, 6160 int oldLeft, int oldTop, int oldRight, int oldBottom); 6161 } 6162 6163 /** 6164 * This is called during layout when the size of this view has changed. If 6165 * you were just added to the view hierarchy, you're called with the old 6166 * values of 0. 6167 * 6168 * @param w Current width of this view. 6169 * @param h Current height of this view. 6170 * @param oldw Old width of this view. 6171 * @param oldh Old height of this view. 6172 */ 6173 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 6174 } 6175 6176 /** 6177 * Called by draw to draw the child views. This may be overridden 6178 * by derived classes to gain control just before its children are drawn 6179 * (but after its own view has been drawn). 6180 * @param canvas the canvas on which to draw the view 6181 */ 6182 protected void dispatchDraw(Canvas canvas) { 6183 } 6184 6185 /** 6186 * Gets the parent of this view. Note that the parent is a 6187 * ViewParent and not necessarily a View. 6188 * 6189 * @return Parent of this view. 6190 */ 6191 public final ViewParent getParent() { 6192 return mParent; 6193 } 6194 6195 /** 6196 * Set the horizontal scrolled position of your view. This will cause a call to 6197 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6198 * invalidated. 6199 * @param value the x position to scroll to 6200 */ 6201 public void setScrollX(int value) { 6202 scrollTo(value, mScrollY); 6203 } 6204 6205 /** 6206 * Set the vertical scrolled position of your view. This will cause a call to 6207 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6208 * invalidated. 6209 * @param value the y position to scroll to 6210 */ 6211 public void setScrollY(int value) { 6212 scrollTo(mScrollX, value); 6213 } 6214 6215 /** 6216 * Return the scrolled left position of this view. This is the left edge of 6217 * the displayed part of your view. You do not need to draw any pixels 6218 * farther left, since those are outside of the frame of your view on 6219 * screen. 6220 * 6221 * @return The left edge of the displayed part of your view, in pixels. 6222 */ 6223 public final int getScrollX() { 6224 return mScrollX; 6225 } 6226 6227 /** 6228 * Return the scrolled top position of this view. This is the top edge of 6229 * the displayed part of your view. You do not need to draw any pixels above 6230 * it, since those are outside of the frame of your view on screen. 6231 * 6232 * @return The top edge of the displayed part of your view, in pixels. 6233 */ 6234 public final int getScrollY() { 6235 return mScrollY; 6236 } 6237 6238 /** 6239 * Return the width of the your view. 6240 * 6241 * @return The width of your view, in pixels. 6242 */ 6243 @ViewDebug.ExportedProperty(category = "layout") 6244 public final int getWidth() { 6245 return mRight - mLeft; 6246 } 6247 6248 /** 6249 * Return the height of your view. 6250 * 6251 * @return The height of your view, in pixels. 6252 */ 6253 @ViewDebug.ExportedProperty(category = "layout") 6254 public final int getHeight() { 6255 return mBottom - mTop; 6256 } 6257 6258 /** 6259 * Return the visible drawing bounds of your view. Fills in the output 6260 * rectangle with the values from getScrollX(), getScrollY(), 6261 * getWidth(), and getHeight(). 6262 * 6263 * @param outRect The (scrolled) drawing bounds of the view. 6264 */ 6265 public void getDrawingRect(Rect outRect) { 6266 outRect.left = mScrollX; 6267 outRect.top = mScrollY; 6268 outRect.right = mScrollX + (mRight - mLeft); 6269 outRect.bottom = mScrollY + (mBottom - mTop); 6270 } 6271 6272 /** 6273 * Like {@link #getMeasuredWidthAndState()}, but only returns the 6274 * raw width component (that is the result is masked by 6275 * {@link #MEASURED_SIZE_MASK}). 6276 * 6277 * @return The raw measured width of this view. 6278 */ 6279 public final int getMeasuredWidth() { 6280 return mMeasuredWidth & MEASURED_SIZE_MASK; 6281 } 6282 6283 /** 6284 * Return the full width measurement information for this view as computed 6285 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6286 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6287 * This should be used during measurement and layout calculations only. Use 6288 * {@link #getWidth()} to see how wide a view is after layout. 6289 * 6290 * @return The measured width of this view as a bit mask. 6291 */ 6292 public final int getMeasuredWidthAndState() { 6293 return mMeasuredWidth; 6294 } 6295 6296 /** 6297 * Like {@link #getMeasuredHeightAndState()}, but only returns the 6298 * raw width component (that is the result is masked by 6299 * {@link #MEASURED_SIZE_MASK}). 6300 * 6301 * @return The raw measured height of this view. 6302 */ 6303 public final int getMeasuredHeight() { 6304 return mMeasuredHeight & MEASURED_SIZE_MASK; 6305 } 6306 6307 /** 6308 * Return the full height measurement information for this view as computed 6309 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6310 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6311 * This should be used during measurement and layout calculations only. Use 6312 * {@link #getHeight()} to see how wide a view is after layout. 6313 * 6314 * @return The measured width of this view as a bit mask. 6315 */ 6316 public final int getMeasuredHeightAndState() { 6317 return mMeasuredHeight; 6318 } 6319 6320 /** 6321 * Return only the state bits of {@link #getMeasuredWidthAndState()} 6322 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 6323 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 6324 * and the height component is at the shifted bits 6325 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 6326 */ 6327 public final int getMeasuredState() { 6328 return (mMeasuredWidth&MEASURED_STATE_MASK) 6329 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 6330 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 6331 } 6332 6333 /** 6334 * The transform matrix of this view, which is calculated based on the current 6335 * roation, scale, and pivot properties. 6336 * 6337 * @see #getRotation() 6338 * @see #getScaleX() 6339 * @see #getScaleY() 6340 * @see #getPivotX() 6341 * @see #getPivotY() 6342 * @return The current transform matrix for the view 6343 */ 6344 public Matrix getMatrix() { 6345 updateMatrix(); 6346 return mMatrix; 6347 } 6348 6349 /** 6350 * Utility function to determine if the value is far enough away from zero to be 6351 * considered non-zero. 6352 * @param value A floating point value to check for zero-ness 6353 * @return whether the passed-in value is far enough away from zero to be considered non-zero 6354 */ 6355 private static boolean nonzero(float value) { 6356 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 6357 } 6358 6359 /** 6360 * Returns true if the transform matrix is the identity matrix. 6361 * Recomputes the matrix if necessary. 6362 * 6363 * @return True if the transform matrix is the identity matrix, false otherwise. 6364 */ 6365 final boolean hasIdentityMatrix() { 6366 updateMatrix(); 6367 return mMatrixIsIdentity; 6368 } 6369 6370 /** 6371 * Recomputes the transform matrix if necessary. 6372 */ 6373 private void updateMatrix() { 6374 if (mMatrixDirty) { 6375 // transform-related properties have changed since the last time someone 6376 // asked for the matrix; recalculate it with the current values 6377 6378 // Figure out if we need to update the pivot point 6379 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6380 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 6381 mPrevWidth = mRight - mLeft; 6382 mPrevHeight = mBottom - mTop; 6383 mPivotX = mPrevWidth / 2f; 6384 mPivotY = mPrevHeight / 2f; 6385 } 6386 } 6387 mMatrix.reset(); 6388 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 6389 mMatrix.setTranslate(mTranslationX, mTranslationY); 6390 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 6391 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6392 } else { 6393 if (mCamera == null) { 6394 mCamera = new Camera(); 6395 matrix3D = new Matrix(); 6396 } 6397 mCamera.save(); 6398 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6399 mCamera.rotate(mRotationX, mRotationY, -mRotation); 6400 mCamera.getMatrix(matrix3D); 6401 matrix3D.preTranslate(-mPivotX, -mPivotY); 6402 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 6403 mMatrix.postConcat(matrix3D); 6404 mCamera.restore(); 6405 } 6406 mMatrixDirty = false; 6407 mMatrixIsIdentity = mMatrix.isIdentity(); 6408 mInverseMatrixDirty = true; 6409 } 6410 } 6411 6412 /** 6413 * Utility method to retrieve the inverse of the current mMatrix property. 6414 * We cache the matrix to avoid recalculating it when transform properties 6415 * have not changed. 6416 * 6417 * @return The inverse of the current matrix of this view. 6418 */ 6419 final Matrix getInverseMatrix() { 6420 updateMatrix(); 6421 if (mInverseMatrixDirty) { 6422 if (mInverseMatrix == null) { 6423 mInverseMatrix = new Matrix(); 6424 } 6425 mMatrix.invert(mInverseMatrix); 6426 mInverseMatrixDirty = false; 6427 } 6428 return mInverseMatrix; 6429 } 6430 6431 /** 6432 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 6433 * views are drawn) from the camera to this view. The camera's distance 6434 * affects 3D transformations, for instance rotations around the X and Y 6435 * axis. If the rotationX or rotationY properties are changed and this view is 6436 * large (more than half the size of the screen), it is recommended to always 6437 * use a camera distance that's greater than the height (X axis rotation) or 6438 * the width (Y axis rotation) of this view.</p> 6439 * 6440 * <p>The distance of the camera from the view plane can have an affect on the 6441 * perspective distortion of the view when it is rotated around the x or y axis. 6442 * For example, a large distance will result in a large viewing angle, and there 6443 * will not be much perspective distortion of the view as it rotates. A short 6444 * distance may cause much more perspective distortion upon rotation, and can 6445 * also result in some drawing artifacts if the rotated view ends up partially 6446 * behind the camera (which is why the recommendation is to use a distance at 6447 * least as far as the size of the view, if the view is to be rotated.)</p> 6448 * 6449 * <p>The distance is expressed in "depth pixels." The default distance depends 6450 * on the screen density. For instance, on a medium density display, the 6451 * default distance is 1280. On a high density display, the default distance 6452 * is 1920.</p> 6453 * 6454 * <p>If you want to specify a distance that leads to visually consistent 6455 * results across various densities, use the following formula:</p> 6456 * <pre> 6457 * float scale = context.getResources().getDisplayMetrics().density; 6458 * view.setCameraDistance(distance * scale); 6459 * </pre> 6460 * 6461 * <p>The density scale factor of a high density display is 1.5, 6462 * and 1920 = 1280 * 1.5.</p> 6463 * 6464 * @param distance The distance in "depth pixels", if negative the opposite 6465 * value is used 6466 * 6467 * @see #setRotationX(float) 6468 * @see #setRotationY(float) 6469 */ 6470 public void setCameraDistance(float distance) { 6471 invalidateParentCaches(); 6472 invalidate(false); 6473 6474 final float dpi = mResources.getDisplayMetrics().densityDpi; 6475 if (mCamera == null) { 6476 mCamera = new Camera(); 6477 matrix3D = new Matrix(); 6478 } 6479 6480 mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 6481 mMatrixDirty = true; 6482 6483 invalidate(false); 6484 } 6485 6486 /** 6487 * The degrees that the view is rotated around the pivot point. 6488 * 6489 * @see #setRotation(float) 6490 * @see #getPivotX() 6491 * @see #getPivotY() 6492 * 6493 * @return The degrees of rotation. 6494 */ 6495 public float getRotation() { 6496 return mRotation; 6497 } 6498 6499 /** 6500 * Sets the degrees that the view is rotated around the pivot point. Increasing values 6501 * result in clockwise rotation. 6502 * 6503 * @param rotation The degrees of rotation. 6504 * 6505 * @see #getRotation() 6506 * @see #getPivotX() 6507 * @see #getPivotY() 6508 * @see #setRotationX(float) 6509 * @see #setRotationY(float) 6510 * 6511 * @attr ref android.R.styleable#View_rotation 6512 */ 6513 public void setRotation(float rotation) { 6514 if (mRotation != rotation) { 6515 invalidateParentCaches(); 6516 // Double-invalidation is necessary to capture view's old and new areas 6517 invalidate(false); 6518 mRotation = rotation; 6519 mMatrixDirty = true; 6520 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6521 invalidate(false); 6522 } 6523 } 6524 6525 /** 6526 * The degrees that the view is rotated around the vertical axis through the pivot point. 6527 * 6528 * @see #getPivotX() 6529 * @see #getPivotY() 6530 * @see #setRotationY(float) 6531 * 6532 * @return The degrees of Y rotation. 6533 */ 6534 public float getRotationY() { 6535 return mRotationY; 6536 } 6537 6538 /** 6539 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 6540 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 6541 * down the y axis. 6542 * 6543 * When rotating large views, it is recommended to adjust the camera distance 6544 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 6545 * 6546 * @param rotationY The degrees of Y rotation. 6547 * 6548 * @see #getRotationY() 6549 * @see #getPivotX() 6550 * @see #getPivotY() 6551 * @see #setRotation(float) 6552 * @see #setRotationX(float) 6553 * @see #setCameraDistance(float) 6554 * 6555 * @attr ref android.R.styleable#View_rotationY 6556 */ 6557 public void setRotationY(float rotationY) { 6558 if (mRotationY != rotationY) { 6559 invalidateParentCaches(); 6560 // Double-invalidation is necessary to capture view's old and new areas 6561 invalidate(false); 6562 mRotationY = rotationY; 6563 mMatrixDirty = true; 6564 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6565 invalidate(false); 6566 } 6567 } 6568 6569 /** 6570 * The degrees that the view is rotated around the horizontal axis through the pivot point. 6571 * 6572 * @see #getPivotX() 6573 * @see #getPivotY() 6574 * @see #setRotationX(float) 6575 * 6576 * @return The degrees of X rotation. 6577 */ 6578 public float getRotationX() { 6579 return mRotationX; 6580 } 6581 6582 /** 6583 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 6584 * Increasing values result in clockwise rotation from the viewpoint of looking down the 6585 * x axis. 6586 * 6587 * When rotating large views, it is recommended to adjust the camera distance 6588 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 6589 * 6590 * @param rotationX The degrees of X rotation. 6591 * 6592 * @see #getRotationX() 6593 * @see #getPivotX() 6594 * @see #getPivotY() 6595 * @see #setRotation(float) 6596 * @see #setRotationY(float) 6597 * @see #setCameraDistance(float) 6598 * 6599 * @attr ref android.R.styleable#View_rotationX 6600 */ 6601 public void setRotationX(float rotationX) { 6602 if (mRotationX != rotationX) { 6603 invalidateParentCaches(); 6604 // Double-invalidation is necessary to capture view's old and new areas 6605 invalidate(false); 6606 mRotationX = rotationX; 6607 mMatrixDirty = true; 6608 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6609 invalidate(false); 6610 } 6611 } 6612 6613 /** 6614 * The amount that the view is scaled in x around the pivot point, as a proportion of 6615 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 6616 * 6617 * <p>By default, this is 1.0f. 6618 * 6619 * @see #getPivotX() 6620 * @see #getPivotY() 6621 * @return The scaling factor. 6622 */ 6623 public float getScaleX() { 6624 return mScaleX; 6625 } 6626 6627 /** 6628 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 6629 * the view's unscaled width. A value of 1 means that no scaling is applied. 6630 * 6631 * @param scaleX The scaling factor. 6632 * @see #getPivotX() 6633 * @see #getPivotY() 6634 * 6635 * @attr ref android.R.styleable#View_scaleX 6636 */ 6637 public void setScaleX(float scaleX) { 6638 if (mScaleX != scaleX) { 6639 invalidateParentCaches(); 6640 // Double-invalidation is necessary to capture view's old and new areas 6641 invalidate(false); 6642 mScaleX = scaleX; 6643 mMatrixDirty = true; 6644 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6645 invalidate(false); 6646 } 6647 } 6648 6649 /** 6650 * The amount that the view is scaled in y around the pivot point, as a proportion of 6651 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 6652 * 6653 * <p>By default, this is 1.0f. 6654 * 6655 * @see #getPivotX() 6656 * @see #getPivotY() 6657 * @return The scaling factor. 6658 */ 6659 public float getScaleY() { 6660 return mScaleY; 6661 } 6662 6663 /** 6664 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 6665 * the view's unscaled width. A value of 1 means that no scaling is applied. 6666 * 6667 * @param scaleY The scaling factor. 6668 * @see #getPivotX() 6669 * @see #getPivotY() 6670 * 6671 * @attr ref android.R.styleable#View_scaleY 6672 */ 6673 public void setScaleY(float scaleY) { 6674 if (mScaleY != scaleY) { 6675 invalidateParentCaches(); 6676 // Double-invalidation is necessary to capture view's old and new areas 6677 invalidate(false); 6678 mScaleY = scaleY; 6679 mMatrixDirty = true; 6680 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6681 invalidate(false); 6682 } 6683 } 6684 6685 /** 6686 * The x location of the point around which the view is {@link #setRotation(float) rotated} 6687 * and {@link #setScaleX(float) scaled}. 6688 * 6689 * @see #getRotation() 6690 * @see #getScaleX() 6691 * @see #getScaleY() 6692 * @see #getPivotY() 6693 * @return The x location of the pivot point. 6694 */ 6695 public float getPivotX() { 6696 return mPivotX; 6697 } 6698 6699 /** 6700 * Sets the x location of the point around which the view is 6701 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 6702 * By default, the pivot point is centered on the object. 6703 * Setting this property disables this behavior and causes the view to use only the 6704 * explicitly set pivotX and pivotY values. 6705 * 6706 * @param pivotX The x location of the pivot point. 6707 * @see #getRotation() 6708 * @see #getScaleX() 6709 * @see #getScaleY() 6710 * @see #getPivotY() 6711 * 6712 * @attr ref android.R.styleable#View_transformPivotX 6713 */ 6714 public void setPivotX(float pivotX) { 6715 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 6716 if (mPivotX != pivotX) { 6717 invalidateParentCaches(); 6718 // Double-invalidation is necessary to capture view's old and new areas 6719 invalidate(false); 6720 mPivotX = pivotX; 6721 mMatrixDirty = true; 6722 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6723 invalidate(false); 6724 } 6725 } 6726 6727 /** 6728 * The y location of the point around which the view is {@link #setRotation(float) rotated} 6729 * and {@link #setScaleY(float) scaled}. 6730 * 6731 * @see #getRotation() 6732 * @see #getScaleX() 6733 * @see #getScaleY() 6734 * @see #getPivotY() 6735 * @return The y location of the pivot point. 6736 */ 6737 public float getPivotY() { 6738 return mPivotY; 6739 } 6740 6741 /** 6742 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 6743 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 6744 * Setting this property disables this behavior and causes the view to use only the 6745 * explicitly set pivotX and pivotY values. 6746 * 6747 * @param pivotY The y location of the pivot point. 6748 * @see #getRotation() 6749 * @see #getScaleX() 6750 * @see #getScaleY() 6751 * @see #getPivotY() 6752 * 6753 * @attr ref android.R.styleable#View_transformPivotY 6754 */ 6755 public void setPivotY(float pivotY) { 6756 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 6757 if (mPivotY != pivotY) { 6758 invalidateParentCaches(); 6759 // Double-invalidation is necessary to capture view's old and new areas 6760 invalidate(false); 6761 mPivotY = pivotY; 6762 mMatrixDirty = true; 6763 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6764 invalidate(false); 6765 } 6766 } 6767 6768 /** 6769 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 6770 * completely transparent and 1 means the view is completely opaque. 6771 * 6772 * <p>By default this is 1.0f. 6773 * @return The opacity of the view. 6774 */ 6775 public float getAlpha() { 6776 return mAlpha; 6777 } 6778 6779 /** 6780 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 6781 * completely transparent and 1 means the view is completely opaque.</p> 6782 * 6783 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 6784 * responsible for applying the opacity itself. Otherwise, calling this method is 6785 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 6786 * setting a hardware layer.</p> 6787 * 6788 * @param alpha The opacity of the view. 6789 * 6790 * @see #setLayerType(int, android.graphics.Paint) 6791 * 6792 * @attr ref android.R.styleable#View_alpha 6793 */ 6794 public void setAlpha(float alpha) { 6795 mAlpha = alpha; 6796 invalidateParentCaches(); 6797 if (onSetAlpha((int) (alpha * 255))) { 6798 mPrivateFlags |= ALPHA_SET; 6799 // subclass is handling alpha - don't optimize rendering cache invalidation 6800 invalidate(true); 6801 } else { 6802 mPrivateFlags &= ~ALPHA_SET; 6803 invalidate(false); 6804 } 6805 } 6806 6807 /** 6808 * Faster version of setAlpha() which performs the same steps except there are 6809 * no calls to invalidate(). The caller of this function should perform proper invalidation 6810 * on the parent and this object. The return value indicates whether the subclass handles 6811 * alpha (the return value for onSetAlpha()). 6812 * 6813 * @param alpha The new value for the alpha property 6814 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) 6815 */ 6816 boolean setAlphaNoInvalidation(float alpha) { 6817 mAlpha = alpha; 6818 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 6819 if (subclassHandlesAlpha) { 6820 mPrivateFlags |= ALPHA_SET; 6821 } else { 6822 mPrivateFlags &= ~ALPHA_SET; 6823 } 6824 return subclassHandlesAlpha; 6825 } 6826 6827 /** 6828 * Top position of this view relative to its parent. 6829 * 6830 * @return The top of this view, in pixels. 6831 */ 6832 @ViewDebug.CapturedViewProperty 6833 public final int getTop() { 6834 return mTop; 6835 } 6836 6837 /** 6838 * Sets the top position of this view relative to its parent. This method is meant to be called 6839 * by the layout system and should not generally be called otherwise, because the property 6840 * may be changed at any time by the layout. 6841 * 6842 * @param top The top of this view, in pixels. 6843 */ 6844 public final void setTop(int top) { 6845 if (top != mTop) { 6846 updateMatrix(); 6847 if (mMatrixIsIdentity) { 6848 if (mAttachInfo != null) { 6849 int minTop; 6850 int yLoc; 6851 if (top < mTop) { 6852 minTop = top; 6853 yLoc = top - mTop; 6854 } else { 6855 minTop = mTop; 6856 yLoc = 0; 6857 } 6858 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 6859 } 6860 } else { 6861 // Double-invalidation is necessary to capture view's old and new areas 6862 invalidate(true); 6863 } 6864 6865 int width = mRight - mLeft; 6866 int oldHeight = mBottom - mTop; 6867 6868 mTop = top; 6869 6870 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6871 6872 if (!mMatrixIsIdentity) { 6873 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6874 // A change in dimension means an auto-centered pivot point changes, too 6875 mMatrixDirty = true; 6876 } 6877 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6878 invalidate(true); 6879 } 6880 mBackgroundSizeChanged = true; 6881 invalidateParentIfNeeded(); 6882 } 6883 } 6884 6885 /** 6886 * Bottom position of this view relative to its parent. 6887 * 6888 * @return The bottom of this view, in pixels. 6889 */ 6890 @ViewDebug.CapturedViewProperty 6891 public final int getBottom() { 6892 return mBottom; 6893 } 6894 6895 /** 6896 * True if this view has changed since the last time being drawn. 6897 * 6898 * @return The dirty state of this view. 6899 */ 6900 public boolean isDirty() { 6901 return (mPrivateFlags & DIRTY_MASK) != 0; 6902 } 6903 6904 /** 6905 * Sets the bottom position of this view relative to its parent. This method is meant to be 6906 * called by the layout system and should not generally be called otherwise, because the 6907 * property may be changed at any time by the layout. 6908 * 6909 * @param bottom The bottom of this view, in pixels. 6910 */ 6911 public final void setBottom(int bottom) { 6912 if (bottom != mBottom) { 6913 updateMatrix(); 6914 if (mMatrixIsIdentity) { 6915 if (mAttachInfo != null) { 6916 int maxBottom; 6917 if (bottom < mBottom) { 6918 maxBottom = mBottom; 6919 } else { 6920 maxBottom = bottom; 6921 } 6922 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 6923 } 6924 } else { 6925 // Double-invalidation is necessary to capture view's old and new areas 6926 invalidate(true); 6927 } 6928 6929 int width = mRight - mLeft; 6930 int oldHeight = mBottom - mTop; 6931 6932 mBottom = bottom; 6933 6934 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6935 6936 if (!mMatrixIsIdentity) { 6937 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6938 // A change in dimension means an auto-centered pivot point changes, too 6939 mMatrixDirty = true; 6940 } 6941 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6942 invalidate(true); 6943 } 6944 mBackgroundSizeChanged = true; 6945 invalidateParentIfNeeded(); 6946 } 6947 } 6948 6949 /** 6950 * Left position of this view relative to its parent. 6951 * 6952 * @return The left edge of this view, in pixels. 6953 */ 6954 @ViewDebug.CapturedViewProperty 6955 public final int getLeft() { 6956 return mLeft; 6957 } 6958 6959 /** 6960 * Sets the left position of this view relative to its parent. This method is meant to be called 6961 * by the layout system and should not generally be called otherwise, because the property 6962 * may be changed at any time by the layout. 6963 * 6964 * @param left The bottom of this view, in pixels. 6965 */ 6966 public final void setLeft(int left) { 6967 if (left != mLeft) { 6968 updateMatrix(); 6969 if (mMatrixIsIdentity) { 6970 if (mAttachInfo != null) { 6971 int minLeft; 6972 int xLoc; 6973 if (left < mLeft) { 6974 minLeft = left; 6975 xLoc = left - mLeft; 6976 } else { 6977 minLeft = mLeft; 6978 xLoc = 0; 6979 } 6980 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 6981 } 6982 } else { 6983 // Double-invalidation is necessary to capture view's old and new areas 6984 invalidate(true); 6985 } 6986 6987 int oldWidth = mRight - mLeft; 6988 int height = mBottom - mTop; 6989 6990 mLeft = left; 6991 6992 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6993 6994 if (!mMatrixIsIdentity) { 6995 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6996 // A change in dimension means an auto-centered pivot point changes, too 6997 mMatrixDirty = true; 6998 } 6999 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7000 invalidate(true); 7001 } 7002 mBackgroundSizeChanged = true; 7003 invalidateParentIfNeeded(); 7004 } 7005 } 7006 7007 /** 7008 * Right position of this view relative to its parent. 7009 * 7010 * @return The right edge of this view, in pixels. 7011 */ 7012 @ViewDebug.CapturedViewProperty 7013 public final int getRight() { 7014 return mRight; 7015 } 7016 7017 /** 7018 * Sets the right position of this view relative to its parent. This method is meant to be called 7019 * by the layout system and should not generally be called otherwise, because the property 7020 * may be changed at any time by the layout. 7021 * 7022 * @param right The bottom of this view, in pixels. 7023 */ 7024 public final void setRight(int right) { 7025 if (right != mRight) { 7026 updateMatrix(); 7027 if (mMatrixIsIdentity) { 7028 if (mAttachInfo != null) { 7029 int maxRight; 7030 if (right < mRight) { 7031 maxRight = mRight; 7032 } else { 7033 maxRight = right; 7034 } 7035 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7036 } 7037 } else { 7038 // Double-invalidation is necessary to capture view's old and new areas 7039 invalidate(true); 7040 } 7041 7042 int oldWidth = mRight - mLeft; 7043 int height = mBottom - mTop; 7044 7045 mRight = right; 7046 7047 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7048 7049 if (!mMatrixIsIdentity) { 7050 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7051 // A change in dimension means an auto-centered pivot point changes, too 7052 mMatrixDirty = true; 7053 } 7054 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7055 invalidate(true); 7056 } 7057 mBackgroundSizeChanged = true; 7058 invalidateParentIfNeeded(); 7059 } 7060 } 7061 7062 /** 7063 * The visual x position of this view, in pixels. This is equivalent to the 7064 * {@link #setTranslationX(float) translationX} property plus the current 7065 * {@link #getLeft() left} property. 7066 * 7067 * @return The visual x position of this view, in pixels. 7068 */ 7069 public float getX() { 7070 return mLeft + mTranslationX; 7071 } 7072 7073 /** 7074 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 7075 * {@link #setTranslationX(float) translationX} property to be the difference between 7076 * the x value passed in and the current {@link #getLeft() left} property. 7077 * 7078 * @param x The visual x position of this view, in pixels. 7079 */ 7080 public void setX(float x) { 7081 setTranslationX(x - mLeft); 7082 } 7083 7084 /** 7085 * The visual y position of this view, in pixels. This is equivalent to the 7086 * {@link #setTranslationY(float) translationY} property plus the current 7087 * {@link #getTop() top} property. 7088 * 7089 * @return The visual y position of this view, in pixels. 7090 */ 7091 public float getY() { 7092 return mTop + mTranslationY; 7093 } 7094 7095 /** 7096 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 7097 * {@link #setTranslationY(float) translationY} property to be the difference between 7098 * the y value passed in and the current {@link #getTop() top} property. 7099 * 7100 * @param y The visual y position of this view, in pixels. 7101 */ 7102 public void setY(float y) { 7103 setTranslationY(y - mTop); 7104 } 7105 7106 7107 /** 7108 * The horizontal location of this view relative to its {@link #getLeft() left} position. 7109 * This position is post-layout, in addition to wherever the object's 7110 * layout placed it. 7111 * 7112 * @return The horizontal position of this view relative to its left position, in pixels. 7113 */ 7114 public float getTranslationX() { 7115 return mTranslationX; 7116 } 7117 7118 /** 7119 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 7120 * This effectively positions the object post-layout, in addition to wherever the object's 7121 * layout placed it. 7122 * 7123 * @param translationX The horizontal position of this view relative to its left position, 7124 * in pixels. 7125 * 7126 * @attr ref android.R.styleable#View_translationX 7127 */ 7128 public void setTranslationX(float translationX) { 7129 if (mTranslationX != translationX) { 7130 invalidateParentCaches(); 7131 // Double-invalidation is necessary to capture view's old and new areas 7132 invalidate(false); 7133 mTranslationX = translationX; 7134 mMatrixDirty = true; 7135 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7136 invalidate(false); 7137 } 7138 } 7139 7140 /** 7141 * The horizontal location of this view relative to its {@link #getTop() top} position. 7142 * This position is post-layout, in addition to wherever the object's 7143 * layout placed it. 7144 * 7145 * @return The vertical position of this view relative to its top position, 7146 * in pixels. 7147 */ 7148 public float getTranslationY() { 7149 return mTranslationY; 7150 } 7151 7152 /** 7153 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 7154 * This effectively positions the object post-layout, in addition to wherever the object's 7155 * layout placed it. 7156 * 7157 * @param translationY The vertical position of this view relative to its top position, 7158 * in pixels. 7159 * 7160 * @attr ref android.R.styleable#View_translationY 7161 */ 7162 public void setTranslationY(float translationY) { 7163 if (mTranslationY != translationY) { 7164 invalidateParentCaches(); 7165 // Double-invalidation is necessary to capture view's old and new areas 7166 invalidate(false); 7167 mTranslationY = translationY; 7168 mMatrixDirty = true; 7169 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7170 invalidate(false); 7171 } 7172 } 7173 7174 /** 7175 * @hide 7176 */ 7177 public void setFastTranslationX(float x) { 7178 mTranslationX = x; 7179 mMatrixDirty = true; 7180 } 7181 7182 /** 7183 * @hide 7184 */ 7185 public void setFastTranslationY(float y) { 7186 mTranslationY = y; 7187 mMatrixDirty = true; 7188 } 7189 7190 /** 7191 * @hide 7192 */ 7193 public void setFastX(float x) { 7194 mTranslationX = x - mLeft; 7195 mMatrixDirty = true; 7196 } 7197 7198 /** 7199 * @hide 7200 */ 7201 public void setFastY(float y) { 7202 mTranslationY = y - mTop; 7203 mMatrixDirty = true; 7204 } 7205 7206 /** 7207 * @hide 7208 */ 7209 public void setFastScaleX(float x) { 7210 mScaleX = x; 7211 mMatrixDirty = true; 7212 } 7213 7214 /** 7215 * @hide 7216 */ 7217 public void setFastScaleY(float y) { 7218 mScaleY = y; 7219 mMatrixDirty = true; 7220 } 7221 7222 /** 7223 * @hide 7224 */ 7225 public void setFastAlpha(float alpha) { 7226 mAlpha = alpha; 7227 } 7228 7229 /** 7230 * @hide 7231 */ 7232 public void setFastRotationY(float y) { 7233 mRotationY = y; 7234 mMatrixDirty = true; 7235 } 7236 7237 /** 7238 * Hit rectangle in parent's coordinates 7239 * 7240 * @param outRect The hit rectangle of the view. 7241 */ 7242 public void getHitRect(Rect outRect) { 7243 updateMatrix(); 7244 if (mMatrixIsIdentity || mAttachInfo == null) { 7245 outRect.set(mLeft, mTop, mRight, mBottom); 7246 } else { 7247 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 7248 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 7249 mMatrix.mapRect(tmpRect); 7250 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 7251 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 7252 } 7253 } 7254 7255 /** 7256 * Determines whether the given point, in local coordinates is inside the view. 7257 */ 7258 /*package*/ final boolean pointInView(float localX, float localY) { 7259 return localX >= 0 && localX < (mRight - mLeft) 7260 && localY >= 0 && localY < (mBottom - mTop); 7261 } 7262 7263 /** 7264 * Utility method to determine whether the given point, in local coordinates, 7265 * is inside the view, where the area of the view is expanded by the slop factor. 7266 * This method is called while processing touch-move events to determine if the event 7267 * is still within the view. 7268 */ 7269 private boolean pointInView(float localX, float localY, float slop) { 7270 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 7271 localY < ((mBottom - mTop) + slop); 7272 } 7273 7274 /** 7275 * When a view has focus and the user navigates away from it, the next view is searched for 7276 * starting from the rectangle filled in by this method. 7277 * 7278 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 7279 * of the view. However, if your view maintains some idea of internal selection, 7280 * such as a cursor, or a selected row or column, you should override this method and 7281 * fill in a more specific rectangle. 7282 * 7283 * @param r The rectangle to fill in, in this view's coordinates. 7284 */ 7285 public void getFocusedRect(Rect r) { 7286 getDrawingRect(r); 7287 } 7288 7289 /** 7290 * If some part of this view is not clipped by any of its parents, then 7291 * return that area in r in global (root) coordinates. To convert r to local 7292 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 7293 * -globalOffset.y)) If the view is completely clipped or translated out, 7294 * return false. 7295 * 7296 * @param r If true is returned, r holds the global coordinates of the 7297 * visible portion of this view. 7298 * @param globalOffset If true is returned, globalOffset holds the dx,dy 7299 * between this view and its root. globalOffet may be null. 7300 * @return true if r is non-empty (i.e. part of the view is visible at the 7301 * root level. 7302 */ 7303 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 7304 int width = mRight - mLeft; 7305 int height = mBottom - mTop; 7306 if (width > 0 && height > 0) { 7307 r.set(0, 0, width, height); 7308 if (globalOffset != null) { 7309 globalOffset.set(-mScrollX, -mScrollY); 7310 } 7311 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 7312 } 7313 return false; 7314 } 7315 7316 public final boolean getGlobalVisibleRect(Rect r) { 7317 return getGlobalVisibleRect(r, null); 7318 } 7319 7320 public final boolean getLocalVisibleRect(Rect r) { 7321 Point offset = new Point(); 7322 if (getGlobalVisibleRect(r, offset)) { 7323 r.offset(-offset.x, -offset.y); // make r local 7324 return true; 7325 } 7326 return false; 7327 } 7328 7329 /** 7330 * Offset this view's vertical location by the specified number of pixels. 7331 * 7332 * @param offset the number of pixels to offset the view by 7333 */ 7334 public void offsetTopAndBottom(int offset) { 7335 if (offset != 0) { 7336 updateMatrix(); 7337 if (mMatrixIsIdentity) { 7338 final ViewParent p = mParent; 7339 if (p != null && mAttachInfo != null) { 7340 final Rect r = mAttachInfo.mTmpInvalRect; 7341 int minTop; 7342 int maxBottom; 7343 int yLoc; 7344 if (offset < 0) { 7345 minTop = mTop + offset; 7346 maxBottom = mBottom; 7347 yLoc = offset; 7348 } else { 7349 minTop = mTop; 7350 maxBottom = mBottom + offset; 7351 yLoc = 0; 7352 } 7353 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 7354 p.invalidateChild(this, r); 7355 } 7356 } else { 7357 invalidate(false); 7358 } 7359 7360 mTop += offset; 7361 mBottom += offset; 7362 7363 if (!mMatrixIsIdentity) { 7364 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7365 invalidate(false); 7366 } 7367 invalidateParentIfNeeded(); 7368 } 7369 } 7370 7371 /** 7372 * Offset this view's horizontal location by the specified amount of pixels. 7373 * 7374 * @param offset the numer of pixels to offset the view by 7375 */ 7376 public void offsetLeftAndRight(int offset) { 7377 if (offset != 0) { 7378 updateMatrix(); 7379 if (mMatrixIsIdentity) { 7380 final ViewParent p = mParent; 7381 if (p != null && mAttachInfo != null) { 7382 final Rect r = mAttachInfo.mTmpInvalRect; 7383 int minLeft; 7384 int maxRight; 7385 if (offset < 0) { 7386 minLeft = mLeft + offset; 7387 maxRight = mRight; 7388 } else { 7389 minLeft = mLeft; 7390 maxRight = mRight + offset; 7391 } 7392 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 7393 p.invalidateChild(this, r); 7394 } 7395 } else { 7396 invalidate(false); 7397 } 7398 7399 mLeft += offset; 7400 mRight += offset; 7401 7402 if (!mMatrixIsIdentity) { 7403 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7404 invalidate(false); 7405 } 7406 invalidateParentIfNeeded(); 7407 } 7408 } 7409 7410 /** 7411 * Get the LayoutParams associated with this view. All views should have 7412 * layout parameters. These supply parameters to the <i>parent</i> of this 7413 * view specifying how it should be arranged. There are many subclasses of 7414 * ViewGroup.LayoutParams, and these correspond to the different subclasses 7415 * of ViewGroup that are responsible for arranging their children. 7416 * 7417 * This method may return null if this View is not attached to a parent 7418 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 7419 * was not invoked successfully. When a View is attached to a parent 7420 * ViewGroup, this method must not return null. 7421 * 7422 * @return The LayoutParams associated with this view, or null if no 7423 * parameters have been set yet 7424 */ 7425 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 7426 public ViewGroup.LayoutParams getLayoutParams() { 7427 return mLayoutParams; 7428 } 7429 7430 /** 7431 * Set the layout parameters associated with this view. These supply 7432 * parameters to the <i>parent</i> of this view specifying how it should be 7433 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 7434 * correspond to the different subclasses of ViewGroup that are responsible 7435 * for arranging their children. 7436 * 7437 * @param params The layout parameters for this view, cannot be null 7438 */ 7439 public void setLayoutParams(ViewGroup.LayoutParams params) { 7440 if (params == null) { 7441 throw new NullPointerException("Layout parameters cannot be null"); 7442 } 7443 mLayoutParams = params; 7444 requestLayout(); 7445 } 7446 7447 /** 7448 * Set the scrolled position of your view. This will cause a call to 7449 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7450 * invalidated. 7451 * @param x the x position to scroll to 7452 * @param y the y position to scroll to 7453 */ 7454 public void scrollTo(int x, int y) { 7455 if (mScrollX != x || mScrollY != y) { 7456 int oldX = mScrollX; 7457 int oldY = mScrollY; 7458 mScrollX = x; 7459 mScrollY = y; 7460 invalidateParentCaches(); 7461 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 7462 if (!awakenScrollBars()) { 7463 invalidate(true); 7464 } 7465 } 7466 } 7467 7468 /** 7469 * Move the scrolled position of your view. This will cause a call to 7470 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7471 * invalidated. 7472 * @param x the amount of pixels to scroll by horizontally 7473 * @param y the amount of pixels to scroll by vertically 7474 */ 7475 public void scrollBy(int x, int y) { 7476 scrollTo(mScrollX + x, mScrollY + y); 7477 } 7478 7479 /** 7480 * <p>Trigger the scrollbars to draw. When invoked this method starts an 7481 * animation to fade the scrollbars out after a default delay. If a subclass 7482 * provides animated scrolling, the start delay should equal the duration 7483 * of the scrolling animation.</p> 7484 * 7485 * <p>The animation starts only if at least one of the scrollbars is 7486 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 7487 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7488 * this method returns true, and false otherwise. If the animation is 7489 * started, this method calls {@link #invalidate()}; in that case the 7490 * caller should not call {@link #invalidate()}.</p> 7491 * 7492 * <p>This method should be invoked every time a subclass directly updates 7493 * the scroll parameters.</p> 7494 * 7495 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 7496 * and {@link #scrollTo(int, int)}.</p> 7497 * 7498 * @return true if the animation is played, false otherwise 7499 * 7500 * @see #awakenScrollBars(int) 7501 * @see #scrollBy(int, int) 7502 * @see #scrollTo(int, int) 7503 * @see #isHorizontalScrollBarEnabled() 7504 * @see #isVerticalScrollBarEnabled() 7505 * @see #setHorizontalScrollBarEnabled(boolean) 7506 * @see #setVerticalScrollBarEnabled(boolean) 7507 */ 7508 protected boolean awakenScrollBars() { 7509 return mScrollCache != null && 7510 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 7511 } 7512 7513 /** 7514 * Trigger the scrollbars to draw. 7515 * This method differs from awakenScrollBars() only in its default duration. 7516 * initialAwakenScrollBars() will show the scroll bars for longer than 7517 * usual to give the user more of a chance to notice them. 7518 * 7519 * @return true if the animation is played, false otherwise. 7520 */ 7521 private boolean initialAwakenScrollBars() { 7522 return mScrollCache != null && 7523 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 7524 } 7525 7526 /** 7527 * <p> 7528 * Trigger the scrollbars to draw. When invoked this method starts an 7529 * animation to fade the scrollbars out after a fixed delay. If a subclass 7530 * provides animated scrolling, the start delay should equal the duration of 7531 * the scrolling animation. 7532 * </p> 7533 * 7534 * <p> 7535 * The animation starts only if at least one of the scrollbars is enabled, 7536 * as specified by {@link #isHorizontalScrollBarEnabled()} and 7537 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7538 * this method returns true, and false otherwise. If the animation is 7539 * started, this method calls {@link #invalidate()}; in that case the caller 7540 * should not call {@link #invalidate()}. 7541 * </p> 7542 * 7543 * <p> 7544 * This method should be invoked everytime a subclass directly updates the 7545 * scroll parameters. 7546 * </p> 7547 * 7548 * @param startDelay the delay, in milliseconds, after which the animation 7549 * should start; when the delay is 0, the animation starts 7550 * immediately 7551 * @return true if the animation is played, false otherwise 7552 * 7553 * @see #scrollBy(int, int) 7554 * @see #scrollTo(int, int) 7555 * @see #isHorizontalScrollBarEnabled() 7556 * @see #isVerticalScrollBarEnabled() 7557 * @see #setHorizontalScrollBarEnabled(boolean) 7558 * @see #setVerticalScrollBarEnabled(boolean) 7559 */ 7560 protected boolean awakenScrollBars(int startDelay) { 7561 return awakenScrollBars(startDelay, true); 7562 } 7563 7564 /** 7565 * <p> 7566 * Trigger the scrollbars to draw. When invoked this method starts an 7567 * animation to fade the scrollbars out after a fixed delay. If a subclass 7568 * provides animated scrolling, the start delay should equal the duration of 7569 * the scrolling animation. 7570 * </p> 7571 * 7572 * <p> 7573 * The animation starts only if at least one of the scrollbars is enabled, 7574 * as specified by {@link #isHorizontalScrollBarEnabled()} and 7575 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7576 * this method returns true, and false otherwise. If the animation is 7577 * started, this method calls {@link #invalidate()} if the invalidate parameter 7578 * is set to true; in that case the caller 7579 * should not call {@link #invalidate()}. 7580 * </p> 7581 * 7582 * <p> 7583 * This method should be invoked everytime a subclass directly updates the 7584 * scroll parameters. 7585 * </p> 7586 * 7587 * @param startDelay the delay, in milliseconds, after which the animation 7588 * should start; when the delay is 0, the animation starts 7589 * immediately 7590 * 7591 * @param invalidate Wheter this method should call invalidate 7592 * 7593 * @return true if the animation is played, false otherwise 7594 * 7595 * @see #scrollBy(int, int) 7596 * @see #scrollTo(int, int) 7597 * @see #isHorizontalScrollBarEnabled() 7598 * @see #isVerticalScrollBarEnabled() 7599 * @see #setHorizontalScrollBarEnabled(boolean) 7600 * @see #setVerticalScrollBarEnabled(boolean) 7601 */ 7602 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 7603 final ScrollabilityCache scrollCache = mScrollCache; 7604 7605 if (scrollCache == null || !scrollCache.fadeScrollBars) { 7606 return false; 7607 } 7608 7609 if (scrollCache.scrollBar == null) { 7610 scrollCache.scrollBar = new ScrollBarDrawable(); 7611 } 7612 7613 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 7614 7615 if (invalidate) { 7616 // Invalidate to show the scrollbars 7617 invalidate(true); 7618 } 7619 7620 if (scrollCache.state == ScrollabilityCache.OFF) { 7621 // FIXME: this is copied from WindowManagerService. 7622 // We should get this value from the system when it 7623 // is possible to do so. 7624 final int KEY_REPEAT_FIRST_DELAY = 750; 7625 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 7626 } 7627 7628 // Tell mScrollCache when we should start fading. This may 7629 // extend the fade start time if one was already scheduled 7630 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 7631 scrollCache.fadeStartTime = fadeStartTime; 7632 scrollCache.state = ScrollabilityCache.ON; 7633 7634 // Schedule our fader to run, unscheduling any old ones first 7635 if (mAttachInfo != null) { 7636 mAttachInfo.mHandler.removeCallbacks(scrollCache); 7637 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 7638 } 7639 7640 return true; 7641 } 7642 7643 return false; 7644 } 7645 7646 /** 7647 * Mark the the area defined by dirty as needing to be drawn. If the view is 7648 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 7649 * in the future. This must be called from a UI thread. To call from a non-UI 7650 * thread, call {@link #postInvalidate()}. 7651 * 7652 * WARNING: This method is destructive to dirty. 7653 * @param dirty the rectangle representing the bounds of the dirty region 7654 */ 7655 public void invalidate(Rect dirty) { 7656 if (ViewDebug.TRACE_HIERARCHY) { 7657 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 7658 } 7659 7660 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7661 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 7662 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 7663 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7664 mPrivateFlags |= INVALIDATED; 7665 final ViewParent p = mParent; 7666 final AttachInfo ai = mAttachInfo; 7667 //noinspection PointlessBooleanExpression,ConstantConditions 7668 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 7669 if (p != null && ai != null && ai.mHardwareAccelerated) { 7670 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 7671 // with a null dirty rect, which tells the ViewAncestor to redraw everything 7672 p.invalidateChild(this, null); 7673 return; 7674 } 7675 } 7676 if (p != null && ai != null) { 7677 final int scrollX = mScrollX; 7678 final int scrollY = mScrollY; 7679 final Rect r = ai.mTmpInvalRect; 7680 r.set(dirty.left - scrollX, dirty.top - scrollY, 7681 dirty.right - scrollX, dirty.bottom - scrollY); 7682 mParent.invalidateChild(this, r); 7683 } 7684 } 7685 } 7686 7687 /** 7688 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 7689 * The coordinates of the dirty rect are relative to the view. 7690 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 7691 * will be called at some point in the future. This must be called from 7692 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 7693 * @param l the left position of the dirty region 7694 * @param t the top position of the dirty region 7695 * @param r the right position of the dirty region 7696 * @param b the bottom position of the dirty region 7697 */ 7698 public void invalidate(int l, int t, int r, int b) { 7699 if (ViewDebug.TRACE_HIERARCHY) { 7700 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 7701 } 7702 7703 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7704 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 7705 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 7706 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7707 mPrivateFlags |= INVALIDATED; 7708 final ViewParent p = mParent; 7709 final AttachInfo ai = mAttachInfo; 7710 //noinspection PointlessBooleanExpression,ConstantConditions 7711 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 7712 if (p != null && ai != null && ai.mHardwareAccelerated) { 7713 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 7714 // with a null dirty rect, which tells the ViewAncestor to redraw everything 7715 p.invalidateChild(this, null); 7716 return; 7717 } 7718 } 7719 if (p != null && ai != null && l < r && t < b) { 7720 final int scrollX = mScrollX; 7721 final int scrollY = mScrollY; 7722 final Rect tmpr = ai.mTmpInvalRect; 7723 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 7724 p.invalidateChild(this, tmpr); 7725 } 7726 } 7727 } 7728 7729 /** 7730 * Invalidate the whole view. If the view is visible, 7731 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 7732 * the future. This must be called from a UI thread. To call from a non-UI thread, 7733 * call {@link #postInvalidate()}. 7734 */ 7735 public void invalidate() { 7736 invalidate(true); 7737 } 7738 7739 /** 7740 * This is where the invalidate() work actually happens. A full invalidate() 7741 * causes the drawing cache to be invalidated, but this function can be called with 7742 * invalidateCache set to false to skip that invalidation step for cases that do not 7743 * need it (for example, a component that remains at the same dimensions with the same 7744 * content). 7745 * 7746 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 7747 * well. This is usually true for a full invalidate, but may be set to false if the 7748 * View's contents or dimensions have not changed. 7749 */ 7750 void invalidate(boolean invalidateCache) { 7751 if (ViewDebug.TRACE_HIERARCHY) { 7752 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 7753 } 7754 7755 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7756 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 7757 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 7758 mLastIsOpaque = isOpaque(); 7759 mPrivateFlags &= ~DRAWN; 7760 if (invalidateCache) { 7761 mPrivateFlags |= INVALIDATED; 7762 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7763 } 7764 final AttachInfo ai = mAttachInfo; 7765 final ViewParent p = mParent; 7766 //noinspection PointlessBooleanExpression,ConstantConditions 7767 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 7768 if (p != null && ai != null && ai.mHardwareAccelerated) { 7769 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 7770 // with a null dirty rect, which tells the ViewAncestor to redraw everything 7771 p.invalidateChild(this, null); 7772 return; 7773 } 7774 } 7775 7776 if (p != null && ai != null) { 7777 final Rect r = ai.mTmpInvalRect; 7778 r.set(0, 0, mRight - mLeft, mBottom - mTop); 7779 // Don't call invalidate -- we don't want to internally scroll 7780 // our own bounds 7781 p.invalidateChild(this, r); 7782 } 7783 } 7784 } 7785 7786 /** 7787 * @hide 7788 */ 7789 public void fastInvalidate() { 7790 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7791 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 7792 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 7793 if (mParent instanceof View) { 7794 ((View) mParent).mPrivateFlags |= INVALIDATED; 7795 } 7796 mPrivateFlags &= ~DRAWN; 7797 mPrivateFlags |= INVALIDATED; 7798 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7799 if (mParent != null && mAttachInfo != null) { 7800 if (mAttachInfo.mHardwareAccelerated) { 7801 mParent.invalidateChild(this, null); 7802 } else { 7803 final Rect r = mAttachInfo.mTmpInvalRect; 7804 r.set(0, 0, mRight - mLeft, mBottom - mTop); 7805 // Don't call invalidate -- we don't want to internally scroll 7806 // our own bounds 7807 mParent.invalidateChild(this, r); 7808 } 7809 } 7810 } 7811 } 7812 7813 /** 7814 * Used to indicate that the parent of this view should clear its caches. This functionality 7815 * is used to force the parent to rebuild its display list (when hardware-accelerated), 7816 * which is necessary when various parent-managed properties of the view change, such as 7817 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 7818 * clears the parent caches and does not causes an invalidate event. 7819 * 7820 * @hide 7821 */ 7822 protected void invalidateParentCaches() { 7823 if (mParent instanceof View) { 7824 ((View) mParent).mPrivateFlags |= INVALIDATED; 7825 } 7826 } 7827 7828 /** 7829 * Used to indicate that the parent of this view should be invalidated. This functionality 7830 * is used to force the parent to rebuild its display list (when hardware-accelerated), 7831 * which is necessary when various parent-managed properties of the view change, such as 7832 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 7833 * an invalidation event to the parent. 7834 * 7835 * @hide 7836 */ 7837 protected void invalidateParentIfNeeded() { 7838 if (isHardwareAccelerated() && mParent instanceof View) { 7839 ((View) mParent).invalidate(true); 7840 } 7841 } 7842 7843 /** 7844 * Indicates whether this View is opaque. An opaque View guarantees that it will 7845 * draw all the pixels overlapping its bounds using a fully opaque color. 7846 * 7847 * Subclasses of View should override this method whenever possible to indicate 7848 * whether an instance is opaque. Opaque Views are treated in a special way by 7849 * the View hierarchy, possibly allowing it to perform optimizations during 7850 * invalidate/draw passes. 7851 * 7852 * @return True if this View is guaranteed to be fully opaque, false otherwise. 7853 */ 7854 @ViewDebug.ExportedProperty(category = "drawing") 7855 public boolean isOpaque() { 7856 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 7857 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 7858 } 7859 7860 /** 7861 * @hide 7862 */ 7863 protected void computeOpaqueFlags() { 7864 // Opaque if: 7865 // - Has a background 7866 // - Background is opaque 7867 // - Doesn't have scrollbars or scrollbars are inside overlay 7868 7869 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 7870 mPrivateFlags |= OPAQUE_BACKGROUND; 7871 } else { 7872 mPrivateFlags &= ~OPAQUE_BACKGROUND; 7873 } 7874 7875 final int flags = mViewFlags; 7876 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 7877 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 7878 mPrivateFlags |= OPAQUE_SCROLLBARS; 7879 } else { 7880 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 7881 } 7882 } 7883 7884 /** 7885 * @hide 7886 */ 7887 protected boolean hasOpaqueScrollbars() { 7888 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 7889 } 7890 7891 /** 7892 * @return A handler associated with the thread running the View. This 7893 * handler can be used to pump events in the UI events queue. 7894 */ 7895 public Handler getHandler() { 7896 if (mAttachInfo != null) { 7897 return mAttachInfo.mHandler; 7898 } 7899 return null; 7900 } 7901 7902 /** 7903 * Causes the Runnable to be added to the message queue. 7904 * The runnable will be run on the user interface thread. 7905 * 7906 * @param action The Runnable that will be executed. 7907 * 7908 * @return Returns true if the Runnable was successfully placed in to the 7909 * message queue. Returns false on failure, usually because the 7910 * looper processing the message queue is exiting. 7911 */ 7912 public boolean post(Runnable action) { 7913 Handler handler; 7914 AttachInfo attachInfo = mAttachInfo; 7915 if (attachInfo != null) { 7916 handler = attachInfo.mHandler; 7917 } else { 7918 // Assume that post will succeed later 7919 ViewAncestor.getRunQueue().post(action); 7920 return true; 7921 } 7922 7923 return handler.post(action); 7924 } 7925 7926 /** 7927 * Causes the Runnable to be added to the message queue, to be run 7928 * after the specified amount of time elapses. 7929 * The runnable will be run on the user interface thread. 7930 * 7931 * @param action The Runnable that will be executed. 7932 * @param delayMillis The delay (in milliseconds) until the Runnable 7933 * will be executed. 7934 * 7935 * @return true if the Runnable was successfully placed in to the 7936 * message queue. Returns false on failure, usually because the 7937 * looper processing the message queue is exiting. Note that a 7938 * result of true does not mean the Runnable will be processed -- 7939 * if the looper is quit before the delivery time of the message 7940 * occurs then the message will be dropped. 7941 */ 7942 public boolean postDelayed(Runnable action, long delayMillis) { 7943 Handler handler; 7944 AttachInfo attachInfo = mAttachInfo; 7945 if (attachInfo != null) { 7946 handler = attachInfo.mHandler; 7947 } else { 7948 // Assume that post will succeed later 7949 ViewAncestor.getRunQueue().postDelayed(action, delayMillis); 7950 return true; 7951 } 7952 7953 return handler.postDelayed(action, delayMillis); 7954 } 7955 7956 /** 7957 * Removes the specified Runnable from the message queue. 7958 * 7959 * @param action The Runnable to remove from the message handling queue 7960 * 7961 * @return true if this view could ask the Handler to remove the Runnable, 7962 * false otherwise. When the returned value is true, the Runnable 7963 * may or may not have been actually removed from the message queue 7964 * (for instance, if the Runnable was not in the queue already.) 7965 */ 7966 public boolean removeCallbacks(Runnable action) { 7967 Handler handler; 7968 AttachInfo attachInfo = mAttachInfo; 7969 if (attachInfo != null) { 7970 handler = attachInfo.mHandler; 7971 } else { 7972 // Assume that post will succeed later 7973 ViewAncestor.getRunQueue().removeCallbacks(action); 7974 return true; 7975 } 7976 7977 handler.removeCallbacks(action); 7978 return true; 7979 } 7980 7981 /** 7982 * Cause an invalidate to happen on a subsequent cycle through the event loop. 7983 * Use this to invalidate the View from a non-UI thread. 7984 * 7985 * @see #invalidate() 7986 */ 7987 public void postInvalidate() { 7988 postInvalidateDelayed(0); 7989 } 7990 7991 /** 7992 * Cause an invalidate of the specified area to happen on a subsequent cycle 7993 * through the event loop. Use this to invalidate the View from a non-UI thread. 7994 * 7995 * @param left The left coordinate of the rectangle to invalidate. 7996 * @param top The top coordinate of the rectangle to invalidate. 7997 * @param right The right coordinate of the rectangle to invalidate. 7998 * @param bottom The bottom coordinate of the rectangle to invalidate. 7999 * 8000 * @see #invalidate(int, int, int, int) 8001 * @see #invalidate(Rect) 8002 */ 8003 public void postInvalidate(int left, int top, int right, int bottom) { 8004 postInvalidateDelayed(0, left, top, right, bottom); 8005 } 8006 8007 /** 8008 * Cause an invalidate to happen on a subsequent cycle through the event 8009 * loop. Waits for the specified amount of time. 8010 * 8011 * @param delayMilliseconds the duration in milliseconds to delay the 8012 * invalidation by 8013 */ 8014 public void postInvalidateDelayed(long delayMilliseconds) { 8015 // We try only with the AttachInfo because there's no point in invalidating 8016 // if we are not attached to our window 8017 AttachInfo attachInfo = mAttachInfo; 8018 if (attachInfo != null) { 8019 Message msg = Message.obtain(); 8020 msg.what = AttachInfo.INVALIDATE_MSG; 8021 msg.obj = this; 8022 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8023 } 8024 } 8025 8026 /** 8027 * Cause an invalidate of the specified area to happen on a subsequent cycle 8028 * through the event loop. Waits for the specified amount of time. 8029 * 8030 * @param delayMilliseconds the duration in milliseconds to delay the 8031 * invalidation by 8032 * @param left The left coordinate of the rectangle to invalidate. 8033 * @param top The top coordinate of the rectangle to invalidate. 8034 * @param right The right coordinate of the rectangle to invalidate. 8035 * @param bottom The bottom coordinate of the rectangle to invalidate. 8036 */ 8037 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8038 int right, int bottom) { 8039 8040 // We try only with the AttachInfo because there's no point in invalidating 8041 // if we are not attached to our window 8042 AttachInfo attachInfo = mAttachInfo; 8043 if (attachInfo != null) { 8044 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8045 info.target = this; 8046 info.left = left; 8047 info.top = top; 8048 info.right = right; 8049 info.bottom = bottom; 8050 8051 final Message msg = Message.obtain(); 8052 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 8053 msg.obj = info; 8054 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8055 } 8056 } 8057 8058 /** 8059 * Called by a parent to request that a child update its values for mScrollX 8060 * and mScrollY if necessary. This will typically be done if the child is 8061 * animating a scroll using a {@link android.widget.Scroller Scroller} 8062 * object. 8063 */ 8064 public void computeScroll() { 8065 } 8066 8067 /** 8068 * <p>Indicate whether the horizontal edges are faded when the view is 8069 * scrolled horizontally.</p> 8070 * 8071 * @return true if the horizontal edges should are faded on scroll, false 8072 * otherwise 8073 * 8074 * @see #setHorizontalFadingEdgeEnabled(boolean) 8075 * @attr ref android.R.styleable#View_fadingEdge 8076 */ 8077 public boolean isHorizontalFadingEdgeEnabled() { 8078 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 8079 } 8080 8081 /** 8082 * <p>Define whether the horizontal edges should be faded when this view 8083 * is scrolled horizontally.</p> 8084 * 8085 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 8086 * be faded when the view is scrolled 8087 * horizontally 8088 * 8089 * @see #isHorizontalFadingEdgeEnabled() 8090 * @attr ref android.R.styleable#View_fadingEdge 8091 */ 8092 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 8093 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 8094 if (horizontalFadingEdgeEnabled) { 8095 initScrollCache(); 8096 } 8097 8098 mViewFlags ^= FADING_EDGE_HORIZONTAL; 8099 } 8100 } 8101 8102 /** 8103 * <p>Indicate whether the vertical edges are faded when the view is 8104 * scrolled horizontally.</p> 8105 * 8106 * @return true if the vertical edges should are faded on scroll, false 8107 * otherwise 8108 * 8109 * @see #setVerticalFadingEdgeEnabled(boolean) 8110 * @attr ref android.R.styleable#View_fadingEdge 8111 */ 8112 public boolean isVerticalFadingEdgeEnabled() { 8113 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 8114 } 8115 8116 /** 8117 * <p>Define whether the vertical edges should be faded when this view 8118 * is scrolled vertically.</p> 8119 * 8120 * @param verticalFadingEdgeEnabled true if the vertical edges should 8121 * be faded when the view is scrolled 8122 * vertically 8123 * 8124 * @see #isVerticalFadingEdgeEnabled() 8125 * @attr ref android.R.styleable#View_fadingEdge 8126 */ 8127 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 8128 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 8129 if (verticalFadingEdgeEnabled) { 8130 initScrollCache(); 8131 } 8132 8133 mViewFlags ^= FADING_EDGE_VERTICAL; 8134 } 8135 } 8136 8137 /** 8138 * Returns the strength, or intensity, of the top faded edge. The strength is 8139 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8140 * returns 0.0 or 1.0 but no value in between. 8141 * 8142 * Subclasses should override this method to provide a smoother fade transition 8143 * when scrolling occurs. 8144 * 8145 * @return the intensity of the top fade as a float between 0.0f and 1.0f 8146 */ 8147 protected float getTopFadingEdgeStrength() { 8148 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 8149 } 8150 8151 /** 8152 * Returns the strength, or intensity, of the bottom faded edge. The strength is 8153 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8154 * returns 0.0 or 1.0 but no value in between. 8155 * 8156 * Subclasses should override this method to provide a smoother fade transition 8157 * when scrolling occurs. 8158 * 8159 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 8160 */ 8161 protected float getBottomFadingEdgeStrength() { 8162 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 8163 computeVerticalScrollRange() ? 1.0f : 0.0f; 8164 } 8165 8166 /** 8167 * Returns the strength, or intensity, of the left faded edge. The strength is 8168 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8169 * returns 0.0 or 1.0 but no value in between. 8170 * 8171 * Subclasses should override this method to provide a smoother fade transition 8172 * when scrolling occurs. 8173 * 8174 * @return the intensity of the left fade as a float between 0.0f and 1.0f 8175 */ 8176 protected float getLeftFadingEdgeStrength() { 8177 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 8178 } 8179 8180 /** 8181 * Returns the strength, or intensity, of the right faded edge. The strength is 8182 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8183 * returns 0.0 or 1.0 but no value in between. 8184 * 8185 * Subclasses should override this method to provide a smoother fade transition 8186 * when scrolling occurs. 8187 * 8188 * @return the intensity of the right fade as a float between 0.0f and 1.0f 8189 */ 8190 protected float getRightFadingEdgeStrength() { 8191 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 8192 computeHorizontalScrollRange() ? 1.0f : 0.0f; 8193 } 8194 8195 /** 8196 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 8197 * scrollbar is not drawn by default.</p> 8198 * 8199 * @return true if the horizontal scrollbar should be painted, false 8200 * otherwise 8201 * 8202 * @see #setHorizontalScrollBarEnabled(boolean) 8203 */ 8204 public boolean isHorizontalScrollBarEnabled() { 8205 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 8206 } 8207 8208 /** 8209 * <p>Define whether the horizontal scrollbar should be drawn or not. The 8210 * scrollbar is not drawn by default.</p> 8211 * 8212 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 8213 * be painted 8214 * 8215 * @see #isHorizontalScrollBarEnabled() 8216 */ 8217 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 8218 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 8219 mViewFlags ^= SCROLLBARS_HORIZONTAL; 8220 computeOpaqueFlags(); 8221 recomputePadding(); 8222 } 8223 } 8224 8225 /** 8226 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 8227 * scrollbar is not drawn by default.</p> 8228 * 8229 * @return true if the vertical scrollbar should be painted, false 8230 * otherwise 8231 * 8232 * @see #setVerticalScrollBarEnabled(boolean) 8233 */ 8234 public boolean isVerticalScrollBarEnabled() { 8235 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 8236 } 8237 8238 /** 8239 * <p>Define whether the vertical scrollbar should be drawn or not. The 8240 * scrollbar is not drawn by default.</p> 8241 * 8242 * @param verticalScrollBarEnabled true if the vertical scrollbar should 8243 * be painted 8244 * 8245 * @see #isVerticalScrollBarEnabled() 8246 */ 8247 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 8248 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 8249 mViewFlags ^= SCROLLBARS_VERTICAL; 8250 computeOpaqueFlags(); 8251 recomputePadding(); 8252 } 8253 } 8254 8255 /** 8256 * @hide 8257 */ 8258 protected void recomputePadding() { 8259 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 8260 } 8261 8262 /** 8263 * Define whether scrollbars will fade when the view is not scrolling. 8264 * 8265 * @param fadeScrollbars wheter to enable fading 8266 * 8267 */ 8268 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 8269 initScrollCache(); 8270 final ScrollabilityCache scrollabilityCache = mScrollCache; 8271 scrollabilityCache.fadeScrollBars = fadeScrollbars; 8272 if (fadeScrollbars) { 8273 scrollabilityCache.state = ScrollabilityCache.OFF; 8274 } else { 8275 scrollabilityCache.state = ScrollabilityCache.ON; 8276 } 8277 } 8278 8279 /** 8280 * 8281 * Returns true if scrollbars will fade when this view is not scrolling 8282 * 8283 * @return true if scrollbar fading is enabled 8284 */ 8285 public boolean isScrollbarFadingEnabled() { 8286 return mScrollCache != null && mScrollCache.fadeScrollBars; 8287 } 8288 8289 /** 8290 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 8291 * inset. When inset, they add to the padding of the view. And the scrollbars 8292 * can be drawn inside the padding area or on the edge of the view. For example, 8293 * if a view has a background drawable and you want to draw the scrollbars 8294 * inside the padding specified by the drawable, you can use 8295 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 8296 * appear at the edge of the view, ignoring the padding, then you can use 8297 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 8298 * @param style the style of the scrollbars. Should be one of 8299 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 8300 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 8301 * @see #SCROLLBARS_INSIDE_OVERLAY 8302 * @see #SCROLLBARS_INSIDE_INSET 8303 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8304 * @see #SCROLLBARS_OUTSIDE_INSET 8305 */ 8306 public void setScrollBarStyle(int style) { 8307 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 8308 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 8309 computeOpaqueFlags(); 8310 recomputePadding(); 8311 } 8312 } 8313 8314 /** 8315 * <p>Returns the current scrollbar style.</p> 8316 * @return the current scrollbar style 8317 * @see #SCROLLBARS_INSIDE_OVERLAY 8318 * @see #SCROLLBARS_INSIDE_INSET 8319 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8320 * @see #SCROLLBARS_OUTSIDE_INSET 8321 */ 8322 public int getScrollBarStyle() { 8323 return mViewFlags & SCROLLBARS_STYLE_MASK; 8324 } 8325 8326 /** 8327 * <p>Compute the horizontal range that the horizontal scrollbar 8328 * represents.</p> 8329 * 8330 * <p>The range is expressed in arbitrary units that must be the same as the 8331 * units used by {@link #computeHorizontalScrollExtent()} and 8332 * {@link #computeHorizontalScrollOffset()}.</p> 8333 * 8334 * <p>The default range is the drawing width of this view.</p> 8335 * 8336 * @return the total horizontal range represented by the horizontal 8337 * scrollbar 8338 * 8339 * @see #computeHorizontalScrollExtent() 8340 * @see #computeHorizontalScrollOffset() 8341 * @see android.widget.ScrollBarDrawable 8342 */ 8343 protected int computeHorizontalScrollRange() { 8344 return getWidth(); 8345 } 8346 8347 /** 8348 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 8349 * within the horizontal range. This value is used to compute the position 8350 * of the thumb within the scrollbar's track.</p> 8351 * 8352 * <p>The range is expressed in arbitrary units that must be the same as the 8353 * units used by {@link #computeHorizontalScrollRange()} and 8354 * {@link #computeHorizontalScrollExtent()}.</p> 8355 * 8356 * <p>The default offset is the scroll offset of this view.</p> 8357 * 8358 * @return the horizontal offset of the scrollbar's thumb 8359 * 8360 * @see #computeHorizontalScrollRange() 8361 * @see #computeHorizontalScrollExtent() 8362 * @see android.widget.ScrollBarDrawable 8363 */ 8364 protected int computeHorizontalScrollOffset() { 8365 return mScrollX; 8366 } 8367 8368 /** 8369 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 8370 * within the horizontal range. This value is used to compute the length 8371 * of the thumb within the scrollbar's track.</p> 8372 * 8373 * <p>The range is expressed in arbitrary units that must be the same as the 8374 * units used by {@link #computeHorizontalScrollRange()} and 8375 * {@link #computeHorizontalScrollOffset()}.</p> 8376 * 8377 * <p>The default extent is the drawing width of this view.</p> 8378 * 8379 * @return the horizontal extent of the scrollbar's thumb 8380 * 8381 * @see #computeHorizontalScrollRange() 8382 * @see #computeHorizontalScrollOffset() 8383 * @see android.widget.ScrollBarDrawable 8384 */ 8385 protected int computeHorizontalScrollExtent() { 8386 return getWidth(); 8387 } 8388 8389 /** 8390 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 8391 * 8392 * <p>The range is expressed in arbitrary units that must be the same as the 8393 * units used by {@link #computeVerticalScrollExtent()} and 8394 * {@link #computeVerticalScrollOffset()}.</p> 8395 * 8396 * @return the total vertical range represented by the vertical scrollbar 8397 * 8398 * <p>The default range is the drawing height of this view.</p> 8399 * 8400 * @see #computeVerticalScrollExtent() 8401 * @see #computeVerticalScrollOffset() 8402 * @see android.widget.ScrollBarDrawable 8403 */ 8404 protected int computeVerticalScrollRange() { 8405 return getHeight(); 8406 } 8407 8408 /** 8409 * <p>Compute the vertical offset of the vertical scrollbar's thumb 8410 * within the horizontal range. This value is used to compute the position 8411 * of the thumb within the scrollbar's track.</p> 8412 * 8413 * <p>The range is expressed in arbitrary units that must be the same as the 8414 * units used by {@link #computeVerticalScrollRange()} and 8415 * {@link #computeVerticalScrollExtent()}.</p> 8416 * 8417 * <p>The default offset is the scroll offset of this view.</p> 8418 * 8419 * @return the vertical offset of the scrollbar's thumb 8420 * 8421 * @see #computeVerticalScrollRange() 8422 * @see #computeVerticalScrollExtent() 8423 * @see android.widget.ScrollBarDrawable 8424 */ 8425 protected int computeVerticalScrollOffset() { 8426 return mScrollY; 8427 } 8428 8429 /** 8430 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 8431 * within the vertical range. This value is used to compute the length 8432 * of the thumb within the scrollbar's track.</p> 8433 * 8434 * <p>The range is expressed in arbitrary units that must be the same as the 8435 * units used by {@link #computeVerticalScrollRange()} and 8436 * {@link #computeVerticalScrollOffset()}.</p> 8437 * 8438 * <p>The default extent is the drawing height of this view.</p> 8439 * 8440 * @return the vertical extent of the scrollbar's thumb 8441 * 8442 * @see #computeVerticalScrollRange() 8443 * @see #computeVerticalScrollOffset() 8444 * @see android.widget.ScrollBarDrawable 8445 */ 8446 protected int computeVerticalScrollExtent() { 8447 return getHeight(); 8448 } 8449 8450 /** 8451 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 8452 * scrollbars are painted only if they have been awakened first.</p> 8453 * 8454 * @param canvas the canvas on which to draw the scrollbars 8455 * 8456 * @see #awakenScrollBars(int) 8457 */ 8458 protected final void onDrawScrollBars(Canvas canvas) { 8459 // scrollbars are drawn only when the animation is running 8460 final ScrollabilityCache cache = mScrollCache; 8461 if (cache != null) { 8462 8463 int state = cache.state; 8464 8465 if (state == ScrollabilityCache.OFF) { 8466 return; 8467 } 8468 8469 boolean invalidate = false; 8470 8471 if (state == ScrollabilityCache.FADING) { 8472 // We're fading -- get our fade interpolation 8473 if (cache.interpolatorValues == null) { 8474 cache.interpolatorValues = new float[1]; 8475 } 8476 8477 float[] values = cache.interpolatorValues; 8478 8479 // Stops the animation if we're done 8480 if (cache.scrollBarInterpolator.timeToValues(values) == 8481 Interpolator.Result.FREEZE_END) { 8482 cache.state = ScrollabilityCache.OFF; 8483 } else { 8484 cache.scrollBar.setAlpha(Math.round(values[0])); 8485 } 8486 8487 // This will make the scroll bars inval themselves after 8488 // drawing. We only want this when we're fading so that 8489 // we prevent excessive redraws 8490 invalidate = true; 8491 } else { 8492 // We're just on -- but we may have been fading before so 8493 // reset alpha 8494 cache.scrollBar.setAlpha(255); 8495 } 8496 8497 8498 final int viewFlags = mViewFlags; 8499 8500 final boolean drawHorizontalScrollBar = 8501 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 8502 final boolean drawVerticalScrollBar = 8503 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 8504 && !isVerticalScrollBarHidden(); 8505 8506 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 8507 final int width = mRight - mLeft; 8508 final int height = mBottom - mTop; 8509 8510 final ScrollBarDrawable scrollBar = cache.scrollBar; 8511 8512 final int scrollX = mScrollX; 8513 final int scrollY = mScrollY; 8514 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 8515 8516 int left, top, right, bottom; 8517 8518 if (drawHorizontalScrollBar) { 8519 int size = scrollBar.getSize(false); 8520 if (size <= 0) { 8521 size = cache.scrollBarSize; 8522 } 8523 8524 scrollBar.setParameters(computeHorizontalScrollRange(), 8525 computeHorizontalScrollOffset(), 8526 computeHorizontalScrollExtent(), false); 8527 final int verticalScrollBarGap = drawVerticalScrollBar ? 8528 getVerticalScrollbarWidth() : 0; 8529 top = scrollY + height - size - (mUserPaddingBottom & inside); 8530 left = scrollX + (mPaddingLeft & inside); 8531 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 8532 bottom = top + size; 8533 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 8534 if (invalidate) { 8535 invalidate(left, top, right, bottom); 8536 } 8537 } 8538 8539 if (drawVerticalScrollBar) { 8540 int size = scrollBar.getSize(true); 8541 if (size <= 0) { 8542 size = cache.scrollBarSize; 8543 } 8544 8545 scrollBar.setParameters(computeVerticalScrollRange(), 8546 computeVerticalScrollOffset(), 8547 computeVerticalScrollExtent(), true); 8548 switch (mVerticalScrollbarPosition) { 8549 default: 8550 case SCROLLBAR_POSITION_DEFAULT: 8551 case SCROLLBAR_POSITION_RIGHT: 8552 left = scrollX + width - size - (mUserPaddingRight & inside); 8553 break; 8554 case SCROLLBAR_POSITION_LEFT: 8555 left = scrollX + (mUserPaddingLeft & inside); 8556 break; 8557 } 8558 top = scrollY + (mPaddingTop & inside); 8559 right = left + size; 8560 bottom = scrollY + height - (mUserPaddingBottom & inside); 8561 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 8562 if (invalidate) { 8563 invalidate(left, top, right, bottom); 8564 } 8565 } 8566 } 8567 } 8568 } 8569 8570 /** 8571 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 8572 * FastScroller is visible. 8573 * @return whether to temporarily hide the vertical scrollbar 8574 * @hide 8575 */ 8576 protected boolean isVerticalScrollBarHidden() { 8577 return false; 8578 } 8579 8580 /** 8581 * <p>Draw the horizontal scrollbar if 8582 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 8583 * 8584 * @param canvas the canvas on which to draw the scrollbar 8585 * @param scrollBar the scrollbar's drawable 8586 * 8587 * @see #isHorizontalScrollBarEnabled() 8588 * @see #computeHorizontalScrollRange() 8589 * @see #computeHorizontalScrollExtent() 8590 * @see #computeHorizontalScrollOffset() 8591 * @see android.widget.ScrollBarDrawable 8592 * @hide 8593 */ 8594 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 8595 int l, int t, int r, int b) { 8596 scrollBar.setBounds(l, t, r, b); 8597 scrollBar.draw(canvas); 8598 } 8599 8600 /** 8601 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 8602 * returns true.</p> 8603 * 8604 * @param canvas the canvas on which to draw the scrollbar 8605 * @param scrollBar the scrollbar's drawable 8606 * 8607 * @see #isVerticalScrollBarEnabled() 8608 * @see #computeVerticalScrollRange() 8609 * @see #computeVerticalScrollExtent() 8610 * @see #computeVerticalScrollOffset() 8611 * @see android.widget.ScrollBarDrawable 8612 * @hide 8613 */ 8614 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 8615 int l, int t, int r, int b) { 8616 scrollBar.setBounds(l, t, r, b); 8617 scrollBar.draw(canvas); 8618 } 8619 8620 /** 8621 * Implement this to do your drawing. 8622 * 8623 * @param canvas the canvas on which the background will be drawn 8624 */ 8625 protected void onDraw(Canvas canvas) { 8626 } 8627 8628 /* 8629 * Caller is responsible for calling requestLayout if necessary. 8630 * (This allows addViewInLayout to not request a new layout.) 8631 */ 8632 void assignParent(ViewParent parent) { 8633 if (mParent == null) { 8634 mParent = parent; 8635 } else if (parent == null) { 8636 mParent = null; 8637 } else { 8638 throw new RuntimeException("view " + this + " being added, but" 8639 + " it already has a parent"); 8640 } 8641 } 8642 8643 /** 8644 * This is called when the view is attached to a window. At this point it 8645 * has a Surface and will start drawing. Note that this function is 8646 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 8647 * however it may be called any time before the first onDraw -- including 8648 * before or after {@link #onMeasure(int, int)}. 8649 * 8650 * @see #onDetachedFromWindow() 8651 */ 8652 protected void onAttachedToWindow() { 8653 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 8654 mParent.requestTransparentRegion(this); 8655 } 8656 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 8657 initialAwakenScrollBars(); 8658 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 8659 } 8660 jumpDrawablesToCurrentState(); 8661 resolveLayoutDirection(); 8662 } 8663 8664 /** 8665 * Resolving the layout direction. LTR is set initially. 8666 * We are supposing here that the parent directionality will be resolved before its children 8667 */ 8668 private void resolveLayoutDirection() { 8669 mPrivateFlags2 &= ~RESOLVED_LAYOUT_RTL; 8670 switch (getLayoutDirection()) { 8671 case LAYOUT_DIRECTION_INHERIT: 8672 // If this is root view, no need to look at parent's layout dir. 8673 if (mParent != null && mParent instanceof ViewGroup && 8674 ((ViewGroup) mParent).isLayoutRtl()) { 8675 mPrivateFlags2 |= RESOLVED_LAYOUT_RTL; 8676 } 8677 break; 8678 case LAYOUT_DIRECTION_RTL: 8679 mPrivateFlags2 |= RESOLVED_LAYOUT_RTL; 8680 break; 8681 } 8682 } 8683 8684 /** 8685 * This is called when the view is detached from a window. At this point it 8686 * no longer has a surface for drawing. 8687 * 8688 * @see #onAttachedToWindow() 8689 */ 8690 protected void onDetachedFromWindow() { 8691 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 8692 8693 removeUnsetPressCallback(); 8694 removeLongPressCallback(); 8695 removePerformClickCallback(); 8696 8697 destroyDrawingCache(); 8698 8699 if (mHardwareLayer != null) { 8700 mHardwareLayer.destroy(); 8701 mHardwareLayer = null; 8702 } 8703 8704 if (mDisplayList != null) { 8705 mDisplayList.invalidate(); 8706 } 8707 8708 if (mAttachInfo != null) { 8709 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 8710 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_RECT_MSG, this); 8711 } 8712 8713 mCurrentAnimation = null; 8714 } 8715 8716 /** 8717 * @return The number of times this view has been attached to a window 8718 */ 8719 protected int getWindowAttachCount() { 8720 return mWindowAttachCount; 8721 } 8722 8723 /** 8724 * Retrieve a unique token identifying the window this view is attached to. 8725 * @return Return the window's token for use in 8726 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 8727 */ 8728 public IBinder getWindowToken() { 8729 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 8730 } 8731 8732 /** 8733 * Retrieve a unique token identifying the top-level "real" window of 8734 * the window that this view is attached to. That is, this is like 8735 * {@link #getWindowToken}, except if the window this view in is a panel 8736 * window (attached to another containing window), then the token of 8737 * the containing window is returned instead. 8738 * 8739 * @return Returns the associated window token, either 8740 * {@link #getWindowToken()} or the containing window's token. 8741 */ 8742 public IBinder getApplicationWindowToken() { 8743 AttachInfo ai = mAttachInfo; 8744 if (ai != null) { 8745 IBinder appWindowToken = ai.mPanelParentWindowToken; 8746 if (appWindowToken == null) { 8747 appWindowToken = ai.mWindowToken; 8748 } 8749 return appWindowToken; 8750 } 8751 return null; 8752 } 8753 8754 /** 8755 * Retrieve private session object this view hierarchy is using to 8756 * communicate with the window manager. 8757 * @return the session object to communicate with the window manager 8758 */ 8759 /*package*/ IWindowSession getWindowSession() { 8760 return mAttachInfo != null ? mAttachInfo.mSession : null; 8761 } 8762 8763 /** 8764 * @param info the {@link android.view.View.AttachInfo} to associated with 8765 * this view 8766 */ 8767 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 8768 //System.out.println("Attached! " + this); 8769 mAttachInfo = info; 8770 mWindowAttachCount++; 8771 // We will need to evaluate the drawable state at least once. 8772 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 8773 if (mFloatingTreeObserver != null) { 8774 info.mTreeObserver.merge(mFloatingTreeObserver); 8775 mFloatingTreeObserver = null; 8776 } 8777 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 8778 mAttachInfo.mScrollContainers.add(this); 8779 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 8780 } 8781 performCollectViewAttributes(visibility); 8782 onAttachedToWindow(); 8783 8784 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 8785 mOnAttachStateChangeListeners; 8786 if (listeners != null && listeners.size() > 0) { 8787 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 8788 // perform the dispatching. The iterator is a safe guard against listeners that 8789 // could mutate the list by calling the various add/remove methods. This prevents 8790 // the array from being modified while we iterate it. 8791 for (OnAttachStateChangeListener listener : listeners) { 8792 listener.onViewAttachedToWindow(this); 8793 } 8794 } 8795 8796 int vis = info.mWindowVisibility; 8797 if (vis != GONE) { 8798 onWindowVisibilityChanged(vis); 8799 } 8800 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 8801 // If nobody has evaluated the drawable state yet, then do it now. 8802 refreshDrawableState(); 8803 } 8804 } 8805 8806 void dispatchDetachedFromWindow() { 8807 AttachInfo info = mAttachInfo; 8808 if (info != null) { 8809 int vis = info.mWindowVisibility; 8810 if (vis != GONE) { 8811 onWindowVisibilityChanged(GONE); 8812 } 8813 } 8814 8815 onDetachedFromWindow(); 8816 8817 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 8818 mOnAttachStateChangeListeners; 8819 if (listeners != null && listeners.size() > 0) { 8820 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 8821 // perform the dispatching. The iterator is a safe guard against listeners that 8822 // could mutate the list by calling the various add/remove methods. This prevents 8823 // the array from being modified while we iterate it. 8824 for (OnAttachStateChangeListener listener : listeners) { 8825 listener.onViewDetachedFromWindow(this); 8826 } 8827 } 8828 8829 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 8830 mAttachInfo.mScrollContainers.remove(this); 8831 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 8832 } 8833 8834 mAttachInfo = null; 8835 } 8836 8837 /** 8838 * Store this view hierarchy's frozen state into the given container. 8839 * 8840 * @param container The SparseArray in which to save the view's state. 8841 * 8842 * @see #restoreHierarchyState(android.util.SparseArray) 8843 * @see #dispatchSaveInstanceState(android.util.SparseArray) 8844 * @see #onSaveInstanceState() 8845 */ 8846 public void saveHierarchyState(SparseArray<Parcelable> container) { 8847 dispatchSaveInstanceState(container); 8848 } 8849 8850 /** 8851 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 8852 * this view and its children. May be overridden to modify how freezing happens to a 8853 * view's children; for example, some views may want to not store state for their children. 8854 * 8855 * @param container The SparseArray in which to save the view's state. 8856 * 8857 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 8858 * @see #saveHierarchyState(android.util.SparseArray) 8859 * @see #onSaveInstanceState() 8860 */ 8861 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 8862 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 8863 mPrivateFlags &= ~SAVE_STATE_CALLED; 8864 Parcelable state = onSaveInstanceState(); 8865 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 8866 throw new IllegalStateException( 8867 "Derived class did not call super.onSaveInstanceState()"); 8868 } 8869 if (state != null) { 8870 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 8871 // + ": " + state); 8872 container.put(mID, state); 8873 } 8874 } 8875 } 8876 8877 /** 8878 * Hook allowing a view to generate a representation of its internal state 8879 * that can later be used to create a new instance with that same state. 8880 * This state should only contain information that is not persistent or can 8881 * not be reconstructed later. For example, you will never store your 8882 * current position on screen because that will be computed again when a 8883 * new instance of the view is placed in its view hierarchy. 8884 * <p> 8885 * Some examples of things you may store here: the current cursor position 8886 * in a text view (but usually not the text itself since that is stored in a 8887 * content provider or other persistent storage), the currently selected 8888 * item in a list view. 8889 * 8890 * @return Returns a Parcelable object containing the view's current dynamic 8891 * state, or null if there is nothing interesting to save. The 8892 * default implementation returns null. 8893 * @see #onRestoreInstanceState(android.os.Parcelable) 8894 * @see #saveHierarchyState(android.util.SparseArray) 8895 * @see #dispatchSaveInstanceState(android.util.SparseArray) 8896 * @see #setSaveEnabled(boolean) 8897 */ 8898 protected Parcelable onSaveInstanceState() { 8899 mPrivateFlags |= SAVE_STATE_CALLED; 8900 return BaseSavedState.EMPTY_STATE; 8901 } 8902 8903 /** 8904 * Restore this view hierarchy's frozen state from the given container. 8905 * 8906 * @param container The SparseArray which holds previously frozen states. 8907 * 8908 * @see #saveHierarchyState(android.util.SparseArray) 8909 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 8910 * @see #onRestoreInstanceState(android.os.Parcelable) 8911 */ 8912 public void restoreHierarchyState(SparseArray<Parcelable> container) { 8913 dispatchRestoreInstanceState(container); 8914 } 8915 8916 /** 8917 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 8918 * state for this view and its children. May be overridden to modify how restoring 8919 * happens to a view's children; for example, some views may want to not store state 8920 * for their children. 8921 * 8922 * @param container The SparseArray which holds previously saved state. 8923 * 8924 * @see #dispatchSaveInstanceState(android.util.SparseArray) 8925 * @see #restoreHierarchyState(android.util.SparseArray) 8926 * @see #onRestoreInstanceState(android.os.Parcelable) 8927 */ 8928 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 8929 if (mID != NO_ID) { 8930 Parcelable state = container.get(mID); 8931 if (state != null) { 8932 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 8933 // + ": " + state); 8934 mPrivateFlags &= ~SAVE_STATE_CALLED; 8935 onRestoreInstanceState(state); 8936 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 8937 throw new IllegalStateException( 8938 "Derived class did not call super.onRestoreInstanceState()"); 8939 } 8940 } 8941 } 8942 } 8943 8944 /** 8945 * Hook allowing a view to re-apply a representation of its internal state that had previously 8946 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 8947 * null state. 8948 * 8949 * @param state The frozen state that had previously been returned by 8950 * {@link #onSaveInstanceState}. 8951 * 8952 * @see #onSaveInstanceState() 8953 * @see #restoreHierarchyState(android.util.SparseArray) 8954 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 8955 */ 8956 protected void onRestoreInstanceState(Parcelable state) { 8957 mPrivateFlags |= SAVE_STATE_CALLED; 8958 if (state != BaseSavedState.EMPTY_STATE && state != null) { 8959 throw new IllegalArgumentException("Wrong state class, expecting View State but " 8960 + "received " + state.getClass().toString() + " instead. This usually happens " 8961 + "when two views of different type have the same id in the same hierarchy. " 8962 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 8963 + "other views do not use the same id."); 8964 } 8965 } 8966 8967 /** 8968 * <p>Return the time at which the drawing of the view hierarchy started.</p> 8969 * 8970 * @return the drawing start time in milliseconds 8971 */ 8972 public long getDrawingTime() { 8973 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 8974 } 8975 8976 /** 8977 * <p>Enables or disables the duplication of the parent's state into this view. When 8978 * duplication is enabled, this view gets its drawable state from its parent rather 8979 * than from its own internal properties.</p> 8980 * 8981 * <p>Note: in the current implementation, setting this property to true after the 8982 * view was added to a ViewGroup might have no effect at all. This property should 8983 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 8984 * 8985 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 8986 * property is enabled, an exception will be thrown.</p> 8987 * 8988 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 8989 * parent, these states should not be affected by this method.</p> 8990 * 8991 * @param enabled True to enable duplication of the parent's drawable state, false 8992 * to disable it. 8993 * 8994 * @see #getDrawableState() 8995 * @see #isDuplicateParentStateEnabled() 8996 */ 8997 public void setDuplicateParentStateEnabled(boolean enabled) { 8998 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 8999 } 9000 9001 /** 9002 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 9003 * 9004 * @return True if this view's drawable state is duplicated from the parent, 9005 * false otherwise 9006 * 9007 * @see #getDrawableState() 9008 * @see #setDuplicateParentStateEnabled(boolean) 9009 */ 9010 public boolean isDuplicateParentStateEnabled() { 9011 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 9012 } 9013 9014 /** 9015 * <p>Specifies the type of layer backing this view. The layer can be 9016 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 9017 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 9018 * 9019 * <p>A layer is associated with an optional {@link android.graphics.Paint} 9020 * instance that controls how the layer is composed on screen. The following 9021 * properties of the paint are taken into account when composing the layer:</p> 9022 * <ul> 9023 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 9024 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 9025 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 9026 * </ul> 9027 * 9028 * <p>If this view has an alpha value set to < 1.0 by calling 9029 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 9030 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 9031 * equivalent to setting a hardware layer on this view and providing a paint with 9032 * the desired alpha value.<p> 9033 * 9034 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 9035 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 9036 * for more information on when and how to use layers.</p> 9037 * 9038 * @param layerType The ype of layer to use with this view, must be one of 9039 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9040 * {@link #LAYER_TYPE_HARDWARE} 9041 * @param paint The paint used to compose the layer. This argument is optional 9042 * and can be null. It is ignored when the layer type is 9043 * {@link #LAYER_TYPE_NONE} 9044 * 9045 * @see #getLayerType() 9046 * @see #LAYER_TYPE_NONE 9047 * @see #LAYER_TYPE_SOFTWARE 9048 * @see #LAYER_TYPE_HARDWARE 9049 * @see #setAlpha(float) 9050 * 9051 * @attr ref android.R.styleable#View_layerType 9052 */ 9053 public void setLayerType(int layerType, Paint paint) { 9054 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 9055 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 9056 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 9057 } 9058 9059 if (layerType == mLayerType) { 9060 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 9061 mLayerPaint = paint == null ? new Paint() : paint; 9062 invalidateParentCaches(); 9063 invalidate(true); 9064 } 9065 return; 9066 } 9067 9068 // Destroy any previous software drawing cache if needed 9069 switch (mLayerType) { 9070 case LAYER_TYPE_HARDWARE: 9071 if (mHardwareLayer != null) { 9072 mHardwareLayer.destroy(); 9073 mHardwareLayer = null; 9074 } 9075 // fall through - unaccelerated views may use software layer mechanism instead 9076 case LAYER_TYPE_SOFTWARE: 9077 if (mDrawingCache != null) { 9078 mDrawingCache.recycle(); 9079 mDrawingCache = null; 9080 } 9081 9082 if (mUnscaledDrawingCache != null) { 9083 mUnscaledDrawingCache.recycle(); 9084 mUnscaledDrawingCache = null; 9085 } 9086 break; 9087 default: 9088 break; 9089 } 9090 9091 mLayerType = layerType; 9092 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 9093 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 9094 mLocalDirtyRect = layerDisabled ? null : new Rect(); 9095 9096 invalidateParentCaches(); 9097 invalidate(true); 9098 } 9099 9100 /** 9101 * Indicates what type of layer is currently associated with this view. By default 9102 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 9103 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 9104 * for more information on the different types of layers. 9105 * 9106 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9107 * {@link #LAYER_TYPE_HARDWARE} 9108 * 9109 * @see #setLayerType(int, android.graphics.Paint) 9110 * @see #buildLayer() 9111 * @see #LAYER_TYPE_NONE 9112 * @see #LAYER_TYPE_SOFTWARE 9113 * @see #LAYER_TYPE_HARDWARE 9114 */ 9115 public int getLayerType() { 9116 return mLayerType; 9117 } 9118 9119 /** 9120 * Forces this view's layer to be created and this view to be rendered 9121 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 9122 * invoking this method will have no effect. 9123 * 9124 * This method can for instance be used to render a view into its layer before 9125 * starting an animation. If this view is complex, rendering into the layer 9126 * before starting the animation will avoid skipping frames. 9127 * 9128 * @throws IllegalStateException If this view is not attached to a window 9129 * 9130 * @see #setLayerType(int, android.graphics.Paint) 9131 */ 9132 public void buildLayer() { 9133 if (mLayerType == LAYER_TYPE_NONE) return; 9134 9135 if (mAttachInfo == null) { 9136 throw new IllegalStateException("This view must be attached to a window first"); 9137 } 9138 9139 switch (mLayerType) { 9140 case LAYER_TYPE_HARDWARE: 9141 getHardwareLayer(); 9142 break; 9143 case LAYER_TYPE_SOFTWARE: 9144 buildDrawingCache(true); 9145 break; 9146 } 9147 } 9148 9149 /** 9150 * <p>Returns a hardware layer that can be used to draw this view again 9151 * without executing its draw method.</p> 9152 * 9153 * @return A HardwareLayer ready to render, or null if an error occurred. 9154 */ 9155 HardwareLayer getHardwareLayer() { 9156 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 9157 return null; 9158 } 9159 9160 final int width = mRight - mLeft; 9161 final int height = mBottom - mTop; 9162 9163 if (width == 0 || height == 0) { 9164 return null; 9165 } 9166 9167 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 9168 if (mHardwareLayer == null) { 9169 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 9170 width, height, isOpaque()); 9171 mLocalDirtyRect.setEmpty(); 9172 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 9173 mHardwareLayer.resize(width, height); 9174 mLocalDirtyRect.setEmpty(); 9175 } 9176 9177 Canvas currentCanvas = mAttachInfo.mHardwareCanvas; 9178 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 9179 mAttachInfo.mHardwareCanvas = canvas; 9180 try { 9181 canvas.setViewport(width, height); 9182 canvas.onPreDraw(mLocalDirtyRect); 9183 mLocalDirtyRect.setEmpty(); 9184 9185 final int restoreCount = canvas.save(); 9186 9187 computeScroll(); 9188 canvas.translate(-mScrollX, -mScrollY); 9189 9190 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9191 9192 // Fast path for layouts with no backgrounds 9193 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9194 mPrivateFlags &= ~DIRTY_MASK; 9195 dispatchDraw(canvas); 9196 } else { 9197 draw(canvas); 9198 } 9199 9200 canvas.restoreToCount(restoreCount); 9201 } finally { 9202 canvas.onPostDraw(); 9203 mHardwareLayer.end(currentCanvas); 9204 mAttachInfo.mHardwareCanvas = currentCanvas; 9205 } 9206 } 9207 9208 return mHardwareLayer; 9209 } 9210 9211 /** 9212 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 9213 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 9214 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 9215 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 9216 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 9217 * null.</p> 9218 * 9219 * <p>Enabling the drawing cache is similar to 9220 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 9221 * acceleration is turned off. When hardware acceleration is turned on, enabling the 9222 * drawing cache has no effect on rendering because the system uses a different mechanism 9223 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 9224 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 9225 * for information on how to enable software and hardware layers.</p> 9226 * 9227 * <p>This API can be used to manually generate 9228 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 9229 * {@link #getDrawingCache()}.</p> 9230 * 9231 * @param enabled true to enable the drawing cache, false otherwise 9232 * 9233 * @see #isDrawingCacheEnabled() 9234 * @see #getDrawingCache() 9235 * @see #buildDrawingCache() 9236 * @see #setLayerType(int, android.graphics.Paint) 9237 */ 9238 public void setDrawingCacheEnabled(boolean enabled) { 9239 mCachingFailed = false; 9240 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 9241 } 9242 9243 /** 9244 * <p>Indicates whether the drawing cache is enabled for this view.</p> 9245 * 9246 * @return true if the drawing cache is enabled 9247 * 9248 * @see #setDrawingCacheEnabled(boolean) 9249 * @see #getDrawingCache() 9250 */ 9251 @ViewDebug.ExportedProperty(category = "drawing") 9252 public boolean isDrawingCacheEnabled() { 9253 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 9254 } 9255 9256 /** 9257 * Debugging utility which recursively outputs the dirty state of a view and its 9258 * descendants. 9259 * 9260 * @hide 9261 */ 9262 @SuppressWarnings({"UnusedDeclaration"}) 9263 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 9264 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 9265 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 9266 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 9267 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 9268 if (clear) { 9269 mPrivateFlags &= clearMask; 9270 } 9271 if (this instanceof ViewGroup) { 9272 ViewGroup parent = (ViewGroup) this; 9273 final int count = parent.getChildCount(); 9274 for (int i = 0; i < count; i++) { 9275 final View child = parent.getChildAt(i); 9276 child.outputDirtyFlags(indent + " ", clear, clearMask); 9277 } 9278 } 9279 } 9280 9281 /** 9282 * This method is used by ViewGroup to cause its children to restore or recreate their 9283 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 9284 * to recreate its own display list, which would happen if it went through the normal 9285 * draw/dispatchDraw mechanisms. 9286 * 9287 * @hide 9288 */ 9289 protected void dispatchGetDisplayList() {} 9290 9291 /** 9292 * A view that is not attached or hardware accelerated cannot create a display list. 9293 * This method checks these conditions and returns the appropriate result. 9294 * 9295 * @return true if view has the ability to create a display list, false otherwise. 9296 * 9297 * @hide 9298 */ 9299 public boolean canHaveDisplayList() { 9300 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 9301 } 9302 9303 /** 9304 * <p>Returns a display list that can be used to draw this view again 9305 * without executing its draw method.</p> 9306 * 9307 * @return A DisplayList ready to replay, or null if caching is not enabled. 9308 * 9309 * @hide 9310 */ 9311 public DisplayList getDisplayList() { 9312 if (!canHaveDisplayList()) { 9313 return null; 9314 } 9315 9316 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 9317 mDisplayList == null || !mDisplayList.isValid() || 9318 mRecreateDisplayList)) { 9319 // Don't need to recreate the display list, just need to tell our 9320 // children to restore/recreate theirs 9321 if (mDisplayList != null && mDisplayList.isValid() && 9322 !mRecreateDisplayList) { 9323 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9324 mPrivateFlags &= ~DIRTY_MASK; 9325 dispatchGetDisplayList(); 9326 9327 return mDisplayList; 9328 } 9329 9330 // If we got here, we're recreating it. Mark it as such to ensure that 9331 // we copy in child display lists into ours in drawChild() 9332 mRecreateDisplayList = true; 9333 if (mDisplayList == null) { 9334 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(this); 9335 // If we're creating a new display list, make sure our parent gets invalidated 9336 // since they will need to recreate their display list to account for this 9337 // new child display list. 9338 invalidateParentCaches(); 9339 } 9340 9341 final HardwareCanvas canvas = mDisplayList.start(); 9342 try { 9343 int width = mRight - mLeft; 9344 int height = mBottom - mTop; 9345 9346 canvas.setViewport(width, height); 9347 // The dirty rect should always be null for a display list 9348 canvas.onPreDraw(null); 9349 9350 final int restoreCount = canvas.save(); 9351 9352 computeScroll(); 9353 canvas.translate(-mScrollX, -mScrollY); 9354 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9355 9356 // Fast path for layouts with no backgrounds 9357 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9358 mPrivateFlags &= ~DIRTY_MASK; 9359 dispatchDraw(canvas); 9360 } else { 9361 draw(canvas); 9362 } 9363 9364 canvas.restoreToCount(restoreCount); 9365 } finally { 9366 canvas.onPostDraw(); 9367 9368 mDisplayList.end(); 9369 } 9370 } else { 9371 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9372 mPrivateFlags &= ~DIRTY_MASK; 9373 } 9374 9375 return mDisplayList; 9376 } 9377 9378 /** 9379 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 9380 * 9381 * @return A non-scaled bitmap representing this view or null if cache is disabled. 9382 * 9383 * @see #getDrawingCache(boolean) 9384 */ 9385 public Bitmap getDrawingCache() { 9386 return getDrawingCache(false); 9387 } 9388 9389 /** 9390 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 9391 * is null when caching is disabled. If caching is enabled and the cache is not ready, 9392 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 9393 * draw from the cache when the cache is enabled. To benefit from the cache, you must 9394 * request the drawing cache by calling this method and draw it on screen if the 9395 * returned bitmap is not null.</p> 9396 * 9397 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 9398 * this method will create a bitmap of the same size as this view. Because this bitmap 9399 * will be drawn scaled by the parent ViewGroup, the result on screen might show 9400 * scaling artifacts. To avoid such artifacts, you should call this method by setting 9401 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 9402 * size than the view. This implies that your application must be able to handle this 9403 * size.</p> 9404 * 9405 * @param autoScale Indicates whether the generated bitmap should be scaled based on 9406 * the current density of the screen when the application is in compatibility 9407 * mode. 9408 * 9409 * @return A bitmap representing this view or null if cache is disabled. 9410 * 9411 * @see #setDrawingCacheEnabled(boolean) 9412 * @see #isDrawingCacheEnabled() 9413 * @see #buildDrawingCache(boolean) 9414 * @see #destroyDrawingCache() 9415 */ 9416 public Bitmap getDrawingCache(boolean autoScale) { 9417 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 9418 return null; 9419 } 9420 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 9421 buildDrawingCache(autoScale); 9422 } 9423 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 9424 } 9425 9426 /** 9427 * <p>Frees the resources used by the drawing cache. If you call 9428 * {@link #buildDrawingCache()} manually without calling 9429 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 9430 * should cleanup the cache with this method afterwards.</p> 9431 * 9432 * @see #setDrawingCacheEnabled(boolean) 9433 * @see #buildDrawingCache() 9434 * @see #getDrawingCache() 9435 */ 9436 public void destroyDrawingCache() { 9437 if (mDrawingCache != null) { 9438 mDrawingCache.recycle(); 9439 mDrawingCache = null; 9440 } 9441 if (mUnscaledDrawingCache != null) { 9442 mUnscaledDrawingCache.recycle(); 9443 mUnscaledDrawingCache = null; 9444 } 9445 } 9446 9447 /** 9448 * Setting a solid background color for the drawing cache's bitmaps will improve 9449 * perfromance and memory usage. Note, though that this should only be used if this 9450 * view will always be drawn on top of a solid color. 9451 * 9452 * @param color The background color to use for the drawing cache's bitmap 9453 * 9454 * @see #setDrawingCacheEnabled(boolean) 9455 * @see #buildDrawingCache() 9456 * @see #getDrawingCache() 9457 */ 9458 public void setDrawingCacheBackgroundColor(int color) { 9459 if (color != mDrawingCacheBackgroundColor) { 9460 mDrawingCacheBackgroundColor = color; 9461 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9462 } 9463 } 9464 9465 /** 9466 * @see #setDrawingCacheBackgroundColor(int) 9467 * 9468 * @return The background color to used for the drawing cache's bitmap 9469 */ 9470 public int getDrawingCacheBackgroundColor() { 9471 return mDrawingCacheBackgroundColor; 9472 } 9473 9474 /** 9475 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 9476 * 9477 * @see #buildDrawingCache(boolean) 9478 */ 9479 public void buildDrawingCache() { 9480 buildDrawingCache(false); 9481 } 9482 9483 /** 9484 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 9485 * 9486 * <p>If you call {@link #buildDrawingCache()} manually without calling 9487 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 9488 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 9489 * 9490 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 9491 * this method will create a bitmap of the same size as this view. Because this bitmap 9492 * will be drawn scaled by the parent ViewGroup, the result on screen might show 9493 * scaling artifacts. To avoid such artifacts, you should call this method by setting 9494 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 9495 * size than the view. This implies that your application must be able to handle this 9496 * size.</p> 9497 * 9498 * <p>You should avoid calling this method when hardware acceleration is enabled. If 9499 * you do not need the drawing cache bitmap, calling this method will increase memory 9500 * usage and cause the view to be rendered in software once, thus negatively impacting 9501 * performance.</p> 9502 * 9503 * @see #getDrawingCache() 9504 * @see #destroyDrawingCache() 9505 */ 9506 public void buildDrawingCache(boolean autoScale) { 9507 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 9508 mDrawingCache == null : mUnscaledDrawingCache == null)) { 9509 mCachingFailed = false; 9510 9511 if (ViewDebug.TRACE_HIERARCHY) { 9512 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 9513 } 9514 9515 int width = mRight - mLeft; 9516 int height = mBottom - mTop; 9517 9518 final AttachInfo attachInfo = mAttachInfo; 9519 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 9520 9521 if (autoScale && scalingRequired) { 9522 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 9523 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 9524 } 9525 9526 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 9527 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 9528 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 9529 9530 if (width <= 0 || height <= 0 || 9531 // Projected bitmap size in bytes 9532 (width * height * (opaque && !use32BitCache ? 2 : 4) > 9533 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 9534 destroyDrawingCache(); 9535 mCachingFailed = true; 9536 return; 9537 } 9538 9539 boolean clear = true; 9540 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 9541 9542 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 9543 Bitmap.Config quality; 9544 if (!opaque) { 9545 // Never pick ARGB_4444 because it looks awful 9546 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 9547 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 9548 case DRAWING_CACHE_QUALITY_AUTO: 9549 quality = Bitmap.Config.ARGB_8888; 9550 break; 9551 case DRAWING_CACHE_QUALITY_LOW: 9552 quality = Bitmap.Config.ARGB_8888; 9553 break; 9554 case DRAWING_CACHE_QUALITY_HIGH: 9555 quality = Bitmap.Config.ARGB_8888; 9556 break; 9557 default: 9558 quality = Bitmap.Config.ARGB_8888; 9559 break; 9560 } 9561 } else { 9562 // Optimization for translucent windows 9563 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 9564 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 9565 } 9566 9567 // Try to cleanup memory 9568 if (bitmap != null) bitmap.recycle(); 9569 9570 try { 9571 bitmap = Bitmap.createBitmap(width, height, quality); 9572 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 9573 if (autoScale) { 9574 mDrawingCache = bitmap; 9575 } else { 9576 mUnscaledDrawingCache = bitmap; 9577 } 9578 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 9579 } catch (OutOfMemoryError e) { 9580 // If there is not enough memory to create the bitmap cache, just 9581 // ignore the issue as bitmap caches are not required to draw the 9582 // view hierarchy 9583 if (autoScale) { 9584 mDrawingCache = null; 9585 } else { 9586 mUnscaledDrawingCache = null; 9587 } 9588 mCachingFailed = true; 9589 return; 9590 } 9591 9592 clear = drawingCacheBackgroundColor != 0; 9593 } 9594 9595 Canvas canvas; 9596 if (attachInfo != null) { 9597 canvas = attachInfo.mCanvas; 9598 if (canvas == null) { 9599 canvas = new Canvas(); 9600 } 9601 canvas.setBitmap(bitmap); 9602 // Temporarily clobber the cached Canvas in case one of our children 9603 // is also using a drawing cache. Without this, the children would 9604 // steal the canvas by attaching their own bitmap to it and bad, bad 9605 // thing would happen (invisible views, corrupted drawings, etc.) 9606 attachInfo.mCanvas = null; 9607 } else { 9608 // This case should hopefully never or seldom happen 9609 canvas = new Canvas(bitmap); 9610 } 9611 9612 if (clear) { 9613 bitmap.eraseColor(drawingCacheBackgroundColor); 9614 } 9615 9616 computeScroll(); 9617 final int restoreCount = canvas.save(); 9618 9619 if (autoScale && scalingRequired) { 9620 final float scale = attachInfo.mApplicationScale; 9621 canvas.scale(scale, scale); 9622 } 9623 9624 canvas.translate(-mScrollX, -mScrollY); 9625 9626 mPrivateFlags |= DRAWN; 9627 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 9628 mLayerType != LAYER_TYPE_NONE) { 9629 mPrivateFlags |= DRAWING_CACHE_VALID; 9630 } 9631 9632 // Fast path for layouts with no backgrounds 9633 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9634 if (ViewDebug.TRACE_HIERARCHY) { 9635 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 9636 } 9637 mPrivateFlags &= ~DIRTY_MASK; 9638 dispatchDraw(canvas); 9639 } else { 9640 draw(canvas); 9641 } 9642 9643 canvas.restoreToCount(restoreCount); 9644 9645 if (attachInfo != null) { 9646 // Restore the cached Canvas for our siblings 9647 attachInfo.mCanvas = canvas; 9648 } 9649 } 9650 } 9651 9652 /** 9653 * Create a snapshot of the view into a bitmap. We should probably make 9654 * some form of this public, but should think about the API. 9655 */ 9656 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 9657 int width = mRight - mLeft; 9658 int height = mBottom - mTop; 9659 9660 final AttachInfo attachInfo = mAttachInfo; 9661 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 9662 width = (int) ((width * scale) + 0.5f); 9663 height = (int) ((height * scale) + 0.5f); 9664 9665 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 9666 if (bitmap == null) { 9667 throw new OutOfMemoryError(); 9668 } 9669 9670 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 9671 9672 Canvas canvas; 9673 if (attachInfo != null) { 9674 canvas = attachInfo.mCanvas; 9675 if (canvas == null) { 9676 canvas = new Canvas(); 9677 } 9678 canvas.setBitmap(bitmap); 9679 // Temporarily clobber the cached Canvas in case one of our children 9680 // is also using a drawing cache. Without this, the children would 9681 // steal the canvas by attaching their own bitmap to it and bad, bad 9682 // things would happen (invisible views, corrupted drawings, etc.) 9683 attachInfo.mCanvas = null; 9684 } else { 9685 // This case should hopefully never or seldom happen 9686 canvas = new Canvas(bitmap); 9687 } 9688 9689 if ((backgroundColor & 0xff000000) != 0) { 9690 bitmap.eraseColor(backgroundColor); 9691 } 9692 9693 computeScroll(); 9694 final int restoreCount = canvas.save(); 9695 canvas.scale(scale, scale); 9696 canvas.translate(-mScrollX, -mScrollY); 9697 9698 // Temporarily remove the dirty mask 9699 int flags = mPrivateFlags; 9700 mPrivateFlags &= ~DIRTY_MASK; 9701 9702 // Fast path for layouts with no backgrounds 9703 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9704 dispatchDraw(canvas); 9705 } else { 9706 draw(canvas); 9707 } 9708 9709 mPrivateFlags = flags; 9710 9711 canvas.restoreToCount(restoreCount); 9712 9713 if (attachInfo != null) { 9714 // Restore the cached Canvas for our siblings 9715 attachInfo.mCanvas = canvas; 9716 } 9717 9718 return bitmap; 9719 } 9720 9721 /** 9722 * Indicates whether this View is currently in edit mode. A View is usually 9723 * in edit mode when displayed within a developer tool. For instance, if 9724 * this View is being drawn by a visual user interface builder, this method 9725 * should return true. 9726 * 9727 * Subclasses should check the return value of this method to provide 9728 * different behaviors if their normal behavior might interfere with the 9729 * host environment. For instance: the class spawns a thread in its 9730 * constructor, the drawing code relies on device-specific features, etc. 9731 * 9732 * This method is usually checked in the drawing code of custom widgets. 9733 * 9734 * @return True if this View is in edit mode, false otherwise. 9735 */ 9736 public boolean isInEditMode() { 9737 return false; 9738 } 9739 9740 /** 9741 * If the View draws content inside its padding and enables fading edges, 9742 * it needs to support padding offsets. Padding offsets are added to the 9743 * fading edges to extend the length of the fade so that it covers pixels 9744 * drawn inside the padding. 9745 * 9746 * Subclasses of this class should override this method if they need 9747 * to draw content inside the padding. 9748 * 9749 * @return True if padding offset must be applied, false otherwise. 9750 * 9751 * @see #getLeftPaddingOffset() 9752 * @see #getRightPaddingOffset() 9753 * @see #getTopPaddingOffset() 9754 * @see #getBottomPaddingOffset() 9755 * 9756 * @since CURRENT 9757 */ 9758 protected boolean isPaddingOffsetRequired() { 9759 return false; 9760 } 9761 9762 /** 9763 * Amount by which to extend the left fading region. Called only when 9764 * {@link #isPaddingOffsetRequired()} returns true. 9765 * 9766 * @return The left padding offset in pixels. 9767 * 9768 * @see #isPaddingOffsetRequired() 9769 * 9770 * @since CURRENT 9771 */ 9772 protected int getLeftPaddingOffset() { 9773 return 0; 9774 } 9775 9776 /** 9777 * Amount by which to extend the right fading region. Called only when 9778 * {@link #isPaddingOffsetRequired()} returns true. 9779 * 9780 * @return The right padding offset in pixels. 9781 * 9782 * @see #isPaddingOffsetRequired() 9783 * 9784 * @since CURRENT 9785 */ 9786 protected int getRightPaddingOffset() { 9787 return 0; 9788 } 9789 9790 /** 9791 * Amount by which to extend the top fading region. Called only when 9792 * {@link #isPaddingOffsetRequired()} returns true. 9793 * 9794 * @return The top padding offset in pixels. 9795 * 9796 * @see #isPaddingOffsetRequired() 9797 * 9798 * @since CURRENT 9799 */ 9800 protected int getTopPaddingOffset() { 9801 return 0; 9802 } 9803 9804 /** 9805 * Amount by which to extend the bottom fading region. Called only when 9806 * {@link #isPaddingOffsetRequired()} returns true. 9807 * 9808 * @return The bottom padding offset in pixels. 9809 * 9810 * @see #isPaddingOffsetRequired() 9811 * 9812 * @since CURRENT 9813 */ 9814 protected int getBottomPaddingOffset() { 9815 return 0; 9816 } 9817 9818 /** 9819 * <p>Indicates whether this view is attached to an hardware accelerated 9820 * window or not.</p> 9821 * 9822 * <p>Even if this method returns true, it does not mean that every call 9823 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 9824 * accelerated {@link android.graphics.Canvas}. For instance, if this view 9825 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 9826 * window is hardware accelerated, 9827 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 9828 * return false, and this method will return true.</p> 9829 * 9830 * @return True if the view is attached to a window and the window is 9831 * hardware accelerated; false in any other case. 9832 */ 9833 public boolean isHardwareAccelerated() { 9834 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 9835 } 9836 9837 /** 9838 * Manually render this view (and all of its children) to the given Canvas. 9839 * The view must have already done a full layout before this function is 9840 * called. When implementing a view, implement 9841 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 9842 * If you do need to override this method, call the superclass version. 9843 * 9844 * @param canvas The Canvas to which the View is rendered. 9845 */ 9846 public void draw(Canvas canvas) { 9847 if (ViewDebug.TRACE_HIERARCHY) { 9848 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 9849 } 9850 9851 final int privateFlags = mPrivateFlags; 9852 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 9853 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 9854 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 9855 9856 /* 9857 * Draw traversal performs several drawing steps which must be executed 9858 * in the appropriate order: 9859 * 9860 * 1. Draw the background 9861 * 2. If necessary, save the canvas' layers to prepare for fading 9862 * 3. Draw view's content 9863 * 4. Draw children 9864 * 5. If necessary, draw the fading edges and restore layers 9865 * 6. Draw decorations (scrollbars for instance) 9866 */ 9867 9868 // Step 1, draw the background, if needed 9869 int saveCount; 9870 9871 if (!dirtyOpaque) { 9872 final Drawable background = mBGDrawable; 9873 if (background != null) { 9874 final int scrollX = mScrollX; 9875 final int scrollY = mScrollY; 9876 9877 if (mBackgroundSizeChanged) { 9878 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 9879 mBackgroundSizeChanged = false; 9880 } 9881 9882 if ((scrollX | scrollY) == 0) { 9883 background.draw(canvas); 9884 } else { 9885 canvas.translate(scrollX, scrollY); 9886 background.draw(canvas); 9887 canvas.translate(-scrollX, -scrollY); 9888 } 9889 } 9890 } 9891 9892 // skip step 2 & 5 if possible (common case) 9893 final int viewFlags = mViewFlags; 9894 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 9895 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 9896 if (!verticalEdges && !horizontalEdges) { 9897 // Step 3, draw the content 9898 if (!dirtyOpaque) onDraw(canvas); 9899 9900 // Step 4, draw the children 9901 dispatchDraw(canvas); 9902 9903 // Step 6, draw decorations (scrollbars) 9904 onDrawScrollBars(canvas); 9905 9906 // we're done... 9907 return; 9908 } 9909 9910 /* 9911 * Here we do the full fledged routine... 9912 * (this is an uncommon case where speed matters less, 9913 * this is why we repeat some of the tests that have been 9914 * done above) 9915 */ 9916 9917 boolean drawTop = false; 9918 boolean drawBottom = false; 9919 boolean drawLeft = false; 9920 boolean drawRight = false; 9921 9922 float topFadeStrength = 0.0f; 9923 float bottomFadeStrength = 0.0f; 9924 float leftFadeStrength = 0.0f; 9925 float rightFadeStrength = 0.0f; 9926 9927 // Step 2, save the canvas' layers 9928 int paddingLeft = mPaddingLeft; 9929 int paddingTop = mPaddingTop; 9930 9931 final boolean offsetRequired = isPaddingOffsetRequired(); 9932 if (offsetRequired) { 9933 paddingLeft += getLeftPaddingOffset(); 9934 paddingTop += getTopPaddingOffset(); 9935 } 9936 9937 int left = mScrollX + paddingLeft; 9938 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 9939 int top = mScrollY + paddingTop; 9940 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 9941 9942 if (offsetRequired) { 9943 right += getRightPaddingOffset(); 9944 bottom += getBottomPaddingOffset(); 9945 } 9946 9947 final ScrollabilityCache scrollabilityCache = mScrollCache; 9948 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 9949 int length = (int) fadeHeight; 9950 9951 // clip the fade length if top and bottom fades overlap 9952 // overlapping fades produce odd-looking artifacts 9953 if (verticalEdges && (top + length > bottom - length)) { 9954 length = (bottom - top) / 2; 9955 } 9956 9957 // also clip horizontal fades if necessary 9958 if (horizontalEdges && (left + length > right - length)) { 9959 length = (right - left) / 2; 9960 } 9961 9962 if (verticalEdges) { 9963 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 9964 drawTop = topFadeStrength * fadeHeight > 1.0f; 9965 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 9966 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 9967 } 9968 9969 if (horizontalEdges) { 9970 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 9971 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 9972 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 9973 drawRight = rightFadeStrength * fadeHeight > 1.0f; 9974 } 9975 9976 saveCount = canvas.getSaveCount(); 9977 9978 int solidColor = getSolidColor(); 9979 if (solidColor == 0) { 9980 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 9981 9982 if (drawTop) { 9983 canvas.saveLayer(left, top, right, top + length, null, flags); 9984 } 9985 9986 if (drawBottom) { 9987 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 9988 } 9989 9990 if (drawLeft) { 9991 canvas.saveLayer(left, top, left + length, bottom, null, flags); 9992 } 9993 9994 if (drawRight) { 9995 canvas.saveLayer(right - length, top, right, bottom, null, flags); 9996 } 9997 } else { 9998 scrollabilityCache.setFadeColor(solidColor); 9999 } 10000 10001 // Step 3, draw the content 10002 if (!dirtyOpaque) onDraw(canvas); 10003 10004 // Step 4, draw the children 10005 dispatchDraw(canvas); 10006 10007 // Step 5, draw the fade effect and restore layers 10008 final Paint p = scrollabilityCache.paint; 10009 final Matrix matrix = scrollabilityCache.matrix; 10010 final Shader fade = scrollabilityCache.shader; 10011 10012 if (drawTop) { 10013 matrix.setScale(1, fadeHeight * topFadeStrength); 10014 matrix.postTranslate(left, top); 10015 fade.setLocalMatrix(matrix); 10016 canvas.drawRect(left, top, right, top + length, p); 10017 } 10018 10019 if (drawBottom) { 10020 matrix.setScale(1, fadeHeight * bottomFadeStrength); 10021 matrix.postRotate(180); 10022 matrix.postTranslate(left, bottom); 10023 fade.setLocalMatrix(matrix); 10024 canvas.drawRect(left, bottom - length, right, bottom, p); 10025 } 10026 10027 if (drawLeft) { 10028 matrix.setScale(1, fadeHeight * leftFadeStrength); 10029 matrix.postRotate(-90); 10030 matrix.postTranslate(left, top); 10031 fade.setLocalMatrix(matrix); 10032 canvas.drawRect(left, top, left + length, bottom, p); 10033 } 10034 10035 if (drawRight) { 10036 matrix.setScale(1, fadeHeight * rightFadeStrength); 10037 matrix.postRotate(90); 10038 matrix.postTranslate(right, top); 10039 fade.setLocalMatrix(matrix); 10040 canvas.drawRect(right - length, top, right, bottom, p); 10041 } 10042 10043 canvas.restoreToCount(saveCount); 10044 10045 // Step 6, draw decorations (scrollbars) 10046 onDrawScrollBars(canvas); 10047 } 10048 10049 /** 10050 * Override this if your view is known to always be drawn on top of a solid color background, 10051 * and needs to draw fading edges. Returning a non-zero color enables the view system to 10052 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 10053 * should be set to 0xFF. 10054 * 10055 * @see #setVerticalFadingEdgeEnabled(boolean) 10056 * @see #setHorizontalFadingEdgeEnabled(boolean) 10057 * 10058 * @return The known solid color background for this view, or 0 if the color may vary 10059 */ 10060 @ViewDebug.ExportedProperty(category = "drawing") 10061 public int getSolidColor() { 10062 return 0; 10063 } 10064 10065 /** 10066 * Build a human readable string representation of the specified view flags. 10067 * 10068 * @param flags the view flags to convert to a string 10069 * @return a String representing the supplied flags 10070 */ 10071 private static String printFlags(int flags) { 10072 String output = ""; 10073 int numFlags = 0; 10074 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 10075 output += "TAKES_FOCUS"; 10076 numFlags++; 10077 } 10078 10079 switch (flags & VISIBILITY_MASK) { 10080 case INVISIBLE: 10081 if (numFlags > 0) { 10082 output += " "; 10083 } 10084 output += "INVISIBLE"; 10085 // USELESS HERE numFlags++; 10086 break; 10087 case GONE: 10088 if (numFlags > 0) { 10089 output += " "; 10090 } 10091 output += "GONE"; 10092 // USELESS HERE numFlags++; 10093 break; 10094 default: 10095 break; 10096 } 10097 return output; 10098 } 10099 10100 /** 10101 * Build a human readable string representation of the specified private 10102 * view flags. 10103 * 10104 * @param privateFlags the private view flags to convert to a string 10105 * @return a String representing the supplied flags 10106 */ 10107 private static String printPrivateFlags(int privateFlags) { 10108 String output = ""; 10109 int numFlags = 0; 10110 10111 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 10112 output += "WANTS_FOCUS"; 10113 numFlags++; 10114 } 10115 10116 if ((privateFlags & FOCUSED) == FOCUSED) { 10117 if (numFlags > 0) { 10118 output += " "; 10119 } 10120 output += "FOCUSED"; 10121 numFlags++; 10122 } 10123 10124 if ((privateFlags & SELECTED) == SELECTED) { 10125 if (numFlags > 0) { 10126 output += " "; 10127 } 10128 output += "SELECTED"; 10129 numFlags++; 10130 } 10131 10132 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 10133 if (numFlags > 0) { 10134 output += " "; 10135 } 10136 output += "IS_ROOT_NAMESPACE"; 10137 numFlags++; 10138 } 10139 10140 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 10141 if (numFlags > 0) { 10142 output += " "; 10143 } 10144 output += "HAS_BOUNDS"; 10145 numFlags++; 10146 } 10147 10148 if ((privateFlags & DRAWN) == DRAWN) { 10149 if (numFlags > 0) { 10150 output += " "; 10151 } 10152 output += "DRAWN"; 10153 // USELESS HERE numFlags++; 10154 } 10155 return output; 10156 } 10157 10158 /** 10159 * <p>Indicates whether or not this view's layout will be requested during 10160 * the next hierarchy layout pass.</p> 10161 * 10162 * @return true if the layout will be forced during next layout pass 10163 */ 10164 public boolean isLayoutRequested() { 10165 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 10166 } 10167 10168 /** 10169 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 10170 * layout attribute and/or the inherited value from the parent.</p> 10171 * 10172 * @return true if the layout is right-to-left. 10173 */ 10174 @ViewDebug.ExportedProperty(category = "layout") 10175 public boolean isLayoutRtl() { 10176 return (mPrivateFlags2 & RESOLVED_LAYOUT_RTL) == RESOLVED_LAYOUT_RTL; 10177 } 10178 10179 /** 10180 * Assign a size and position to a view and all of its 10181 * descendants 10182 * 10183 * <p>This is the second phase of the layout mechanism. 10184 * (The first is measuring). In this phase, each parent calls 10185 * layout on all of its children to position them. 10186 * This is typically done using the child measurements 10187 * that were stored in the measure pass().</p> 10188 * 10189 * <p>Derived classes should not override this method. 10190 * Derived classes with children should override 10191 * onLayout. In that method, they should 10192 * call layout on each of their children.</p> 10193 * 10194 * @param l Left position, relative to parent 10195 * @param t Top position, relative to parent 10196 * @param r Right position, relative to parent 10197 * @param b Bottom position, relative to parent 10198 */ 10199 @SuppressWarnings({"unchecked"}) 10200 public void layout(int l, int t, int r, int b) { 10201 int oldL = mLeft; 10202 int oldT = mTop; 10203 int oldB = mBottom; 10204 int oldR = mRight; 10205 boolean changed = setFrame(l, t, r, b); 10206 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 10207 if (ViewDebug.TRACE_HIERARCHY) { 10208 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 10209 } 10210 10211 onLayout(changed, l, t, r, b); 10212 mPrivateFlags &= ~LAYOUT_REQUIRED; 10213 10214 if (mOnLayoutChangeListeners != null) { 10215 ArrayList<OnLayoutChangeListener> listenersCopy = 10216 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 10217 int numListeners = listenersCopy.size(); 10218 for (int i = 0; i < numListeners; ++i) { 10219 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 10220 } 10221 } 10222 } 10223 mPrivateFlags &= ~FORCE_LAYOUT; 10224 } 10225 10226 /** 10227 * Called from layout when this view should 10228 * assign a size and position to each of its children. 10229 * 10230 * Derived classes with children should override 10231 * this method and call layout on each of 10232 * their children. 10233 * @param changed This is a new size or position for this view 10234 * @param left Left position, relative to parent 10235 * @param top Top position, relative to parent 10236 * @param right Right position, relative to parent 10237 * @param bottom Bottom position, relative to parent 10238 */ 10239 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 10240 } 10241 10242 /** 10243 * Assign a size and position to this view. 10244 * 10245 * This is called from layout. 10246 * 10247 * @param left Left position, relative to parent 10248 * @param top Top position, relative to parent 10249 * @param right Right position, relative to parent 10250 * @param bottom Bottom position, relative to parent 10251 * @return true if the new size and position are different than the 10252 * previous ones 10253 * {@hide} 10254 */ 10255 protected boolean setFrame(int left, int top, int right, int bottom) { 10256 boolean changed = false; 10257 10258 if (DBG) { 10259 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 10260 + right + "," + bottom + ")"); 10261 } 10262 10263 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 10264 changed = true; 10265 10266 // Remember our drawn bit 10267 int drawn = mPrivateFlags & DRAWN; 10268 10269 // Invalidate our old position 10270 invalidate(true); 10271 10272 10273 int oldWidth = mRight - mLeft; 10274 int oldHeight = mBottom - mTop; 10275 10276 mLeft = left; 10277 mTop = top; 10278 mRight = right; 10279 mBottom = bottom; 10280 10281 mPrivateFlags |= HAS_BOUNDS; 10282 10283 int newWidth = right - left; 10284 int newHeight = bottom - top; 10285 10286 if (newWidth != oldWidth || newHeight != oldHeight) { 10287 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 10288 // A change in dimension means an auto-centered pivot point changes, too 10289 mMatrixDirty = true; 10290 } 10291 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 10292 } 10293 10294 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 10295 // If we are visible, force the DRAWN bit to on so that 10296 // this invalidate will go through (at least to our parent). 10297 // This is because someone may have invalidated this view 10298 // before this call to setFrame came in, thereby clearing 10299 // the DRAWN bit. 10300 mPrivateFlags |= DRAWN; 10301 invalidate(true); 10302 // parent display list may need to be recreated based on a change in the bounds 10303 // of any child 10304 invalidateParentCaches(); 10305 } 10306 10307 // Reset drawn bit to original value (invalidate turns it off) 10308 mPrivateFlags |= drawn; 10309 10310 mBackgroundSizeChanged = true; 10311 } 10312 return changed; 10313 } 10314 10315 /** 10316 * Finalize inflating a view from XML. This is called as the last phase 10317 * of inflation, after all child views have been added. 10318 * 10319 * <p>Even if the subclass overrides onFinishInflate, they should always be 10320 * sure to call the super method, so that we get called. 10321 */ 10322 protected void onFinishInflate() { 10323 } 10324 10325 /** 10326 * Returns the resources associated with this view. 10327 * 10328 * @return Resources object. 10329 */ 10330 public Resources getResources() { 10331 return mResources; 10332 } 10333 10334 /** 10335 * Invalidates the specified Drawable. 10336 * 10337 * @param drawable the drawable to invalidate 10338 */ 10339 public void invalidateDrawable(Drawable drawable) { 10340 if (verifyDrawable(drawable)) { 10341 final Rect dirty = drawable.getBounds(); 10342 final int scrollX = mScrollX; 10343 final int scrollY = mScrollY; 10344 10345 invalidate(dirty.left + scrollX, dirty.top + scrollY, 10346 dirty.right + scrollX, dirty.bottom + scrollY); 10347 } 10348 } 10349 10350 /** 10351 * Schedules an action on a drawable to occur at a specified time. 10352 * 10353 * @param who the recipient of the action 10354 * @param what the action to run on the drawable 10355 * @param when the time at which the action must occur. Uses the 10356 * {@link SystemClock#uptimeMillis} timebase. 10357 */ 10358 public void scheduleDrawable(Drawable who, Runnable what, long when) { 10359 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 10360 mAttachInfo.mHandler.postAtTime(what, who, when); 10361 } 10362 } 10363 10364 /** 10365 * Cancels a scheduled action on a drawable. 10366 * 10367 * @param who the recipient of the action 10368 * @param what the action to cancel 10369 */ 10370 public void unscheduleDrawable(Drawable who, Runnable what) { 10371 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 10372 mAttachInfo.mHandler.removeCallbacks(what, who); 10373 } 10374 } 10375 10376 /** 10377 * Unschedule any events associated with the given Drawable. This can be 10378 * used when selecting a new Drawable into a view, so that the previous 10379 * one is completely unscheduled. 10380 * 10381 * @param who The Drawable to unschedule. 10382 * 10383 * @see #drawableStateChanged 10384 */ 10385 public void unscheduleDrawable(Drawable who) { 10386 if (mAttachInfo != null) { 10387 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 10388 } 10389 } 10390 10391 /** 10392 * Check if a given Drawable is in RTL layout direction. 10393 * 10394 * @param who the recipient of the action 10395 */ 10396 public boolean isLayoutRtl(Drawable who) { 10397 return (who == mBGDrawable) && isLayoutRtl(); 10398 } 10399 10400 /** 10401 * If your view subclass is displaying its own Drawable objects, it should 10402 * override this function and return true for any Drawable it is 10403 * displaying. This allows animations for those drawables to be 10404 * scheduled. 10405 * 10406 * <p>Be sure to call through to the super class when overriding this 10407 * function. 10408 * 10409 * @param who The Drawable to verify. Return true if it is one you are 10410 * displaying, else return the result of calling through to the 10411 * super class. 10412 * 10413 * @return boolean If true than the Drawable is being displayed in the 10414 * view; else false and it is not allowed to animate. 10415 * 10416 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 10417 * @see #drawableStateChanged() 10418 */ 10419 protected boolean verifyDrawable(Drawable who) { 10420 return who == mBGDrawable; 10421 } 10422 10423 /** 10424 * This function is called whenever the state of the view changes in such 10425 * a way that it impacts the state of drawables being shown. 10426 * 10427 * <p>Be sure to call through to the superclass when overriding this 10428 * function. 10429 * 10430 * @see Drawable#setState(int[]) 10431 */ 10432 protected void drawableStateChanged() { 10433 Drawable d = mBGDrawable; 10434 if (d != null && d.isStateful()) { 10435 d.setState(getDrawableState()); 10436 } 10437 } 10438 10439 /** 10440 * Call this to force a view to update its drawable state. This will cause 10441 * drawableStateChanged to be called on this view. Views that are interested 10442 * in the new state should call getDrawableState. 10443 * 10444 * @see #drawableStateChanged 10445 * @see #getDrawableState 10446 */ 10447 public void refreshDrawableState() { 10448 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 10449 drawableStateChanged(); 10450 10451 ViewParent parent = mParent; 10452 if (parent != null) { 10453 parent.childDrawableStateChanged(this); 10454 } 10455 } 10456 10457 /** 10458 * Return an array of resource IDs of the drawable states representing the 10459 * current state of the view. 10460 * 10461 * @return The current drawable state 10462 * 10463 * @see Drawable#setState(int[]) 10464 * @see #drawableStateChanged() 10465 * @see #onCreateDrawableState(int) 10466 */ 10467 public final int[] getDrawableState() { 10468 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 10469 return mDrawableState; 10470 } else { 10471 mDrawableState = onCreateDrawableState(0); 10472 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 10473 return mDrawableState; 10474 } 10475 } 10476 10477 /** 10478 * Generate the new {@link android.graphics.drawable.Drawable} state for 10479 * this view. This is called by the view 10480 * system when the cached Drawable state is determined to be invalid. To 10481 * retrieve the current state, you should use {@link #getDrawableState}. 10482 * 10483 * @param extraSpace if non-zero, this is the number of extra entries you 10484 * would like in the returned array in which you can place your own 10485 * states. 10486 * 10487 * @return Returns an array holding the current {@link Drawable} state of 10488 * the view. 10489 * 10490 * @see #mergeDrawableStates(int[], int[]) 10491 */ 10492 protected int[] onCreateDrawableState(int extraSpace) { 10493 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 10494 mParent instanceof View) { 10495 return ((View) mParent).onCreateDrawableState(extraSpace); 10496 } 10497 10498 int[] drawableState; 10499 10500 int privateFlags = mPrivateFlags; 10501 10502 int viewStateIndex = 0; 10503 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 10504 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 10505 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 10506 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 10507 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 10508 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 10509 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 10510 HardwareRenderer.isAvailable()) { 10511 // This is set if HW acceleration is requested, even if the current 10512 // process doesn't allow it. This is just to allow app preview 10513 // windows to better match their app. 10514 viewStateIndex |= VIEW_STATE_ACCELERATED; 10515 } 10516 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 10517 10518 final int privateFlags2 = mPrivateFlags2; 10519 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 10520 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 10521 10522 drawableState = VIEW_STATE_SETS[viewStateIndex]; 10523 10524 //noinspection ConstantIfStatement 10525 if (false) { 10526 Log.i("View", "drawableStateIndex=" + viewStateIndex); 10527 Log.i("View", toString() 10528 + " pressed=" + ((privateFlags & PRESSED) != 0) 10529 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 10530 + " fo=" + hasFocus() 10531 + " sl=" + ((privateFlags & SELECTED) != 0) 10532 + " wf=" + hasWindowFocus() 10533 + ": " + Arrays.toString(drawableState)); 10534 } 10535 10536 if (extraSpace == 0) { 10537 return drawableState; 10538 } 10539 10540 final int[] fullState; 10541 if (drawableState != null) { 10542 fullState = new int[drawableState.length + extraSpace]; 10543 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 10544 } else { 10545 fullState = new int[extraSpace]; 10546 } 10547 10548 return fullState; 10549 } 10550 10551 /** 10552 * Merge your own state values in <var>additionalState</var> into the base 10553 * state values <var>baseState</var> that were returned by 10554 * {@link #onCreateDrawableState(int)}. 10555 * 10556 * @param baseState The base state values returned by 10557 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 10558 * own additional state values. 10559 * 10560 * @param additionalState The additional state values you would like 10561 * added to <var>baseState</var>; this array is not modified. 10562 * 10563 * @return As a convenience, the <var>baseState</var> array you originally 10564 * passed into the function is returned. 10565 * 10566 * @see #onCreateDrawableState(int) 10567 */ 10568 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 10569 final int N = baseState.length; 10570 int i = N - 1; 10571 while (i >= 0 && baseState[i] == 0) { 10572 i--; 10573 } 10574 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 10575 return baseState; 10576 } 10577 10578 /** 10579 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 10580 * on all Drawable objects associated with this view. 10581 */ 10582 public void jumpDrawablesToCurrentState() { 10583 if (mBGDrawable != null) { 10584 mBGDrawable.jumpToCurrentState(); 10585 } 10586 } 10587 10588 /** 10589 * Sets the background color for this view. 10590 * @param color the color of the background 10591 */ 10592 @RemotableViewMethod 10593 public void setBackgroundColor(int color) { 10594 if (mBGDrawable instanceof ColorDrawable) { 10595 ((ColorDrawable) mBGDrawable).setColor(color); 10596 } else { 10597 setBackgroundDrawable(new ColorDrawable(color)); 10598 } 10599 } 10600 10601 /** 10602 * Set the background to a given resource. The resource should refer to 10603 * a Drawable object or 0 to remove the background. 10604 * @param resid The identifier of the resource. 10605 * @attr ref android.R.styleable#View_background 10606 */ 10607 @RemotableViewMethod 10608 public void setBackgroundResource(int resid) { 10609 if (resid != 0 && resid == mBackgroundResource) { 10610 return; 10611 } 10612 10613 Drawable d= null; 10614 if (resid != 0) { 10615 d = mResources.getDrawable(resid); 10616 } 10617 setBackgroundDrawable(d); 10618 10619 mBackgroundResource = resid; 10620 } 10621 10622 /** 10623 * Set the background to a given Drawable, or remove the background. If the 10624 * background has padding, this View's padding is set to the background's 10625 * padding. However, when a background is removed, this View's padding isn't 10626 * touched. If setting the padding is desired, please use 10627 * {@link #setPadding(int, int, int, int)}. 10628 * 10629 * @param d The Drawable to use as the background, or null to remove the 10630 * background 10631 */ 10632 public void setBackgroundDrawable(Drawable d) { 10633 boolean requestLayout = false; 10634 10635 mBackgroundResource = 0; 10636 10637 /* 10638 * Regardless of whether we're setting a new background or not, we want 10639 * to clear the previous drawable. 10640 */ 10641 if (mBGDrawable != null) { 10642 mBGDrawable.setCallback(null); 10643 unscheduleDrawable(mBGDrawable); 10644 } 10645 10646 if (d != null) { 10647 Rect padding = sThreadLocal.get(); 10648 if (padding == null) { 10649 padding = new Rect(); 10650 sThreadLocal.set(padding); 10651 } 10652 if (d.getPadding(padding)) { 10653 setPadding(padding.left, padding.top, padding.right, padding.bottom); 10654 } 10655 10656 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 10657 // if it has a different minimum size, we should layout again 10658 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 10659 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 10660 requestLayout = true; 10661 } 10662 10663 d.setCallback(this); 10664 if (d.isStateful()) { 10665 d.setState(getDrawableState()); 10666 } 10667 d.setVisible(getVisibility() == VISIBLE, false); 10668 mBGDrawable = d; 10669 10670 if ((mPrivateFlags & SKIP_DRAW) != 0) { 10671 mPrivateFlags &= ~SKIP_DRAW; 10672 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 10673 requestLayout = true; 10674 } 10675 } else { 10676 /* Remove the background */ 10677 mBGDrawable = null; 10678 10679 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 10680 /* 10681 * This view ONLY drew the background before and we're removing 10682 * the background, so now it won't draw anything 10683 * (hence we SKIP_DRAW) 10684 */ 10685 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 10686 mPrivateFlags |= SKIP_DRAW; 10687 } 10688 10689 /* 10690 * When the background is set, we try to apply its padding to this 10691 * View. When the background is removed, we don't touch this View's 10692 * padding. This is noted in the Javadocs. Hence, we don't need to 10693 * requestLayout(), the invalidate() below is sufficient. 10694 */ 10695 10696 // The old background's minimum size could have affected this 10697 // View's layout, so let's requestLayout 10698 requestLayout = true; 10699 } 10700 10701 computeOpaqueFlags(); 10702 10703 if (requestLayout) { 10704 requestLayout(); 10705 } 10706 10707 mBackgroundSizeChanged = true; 10708 invalidate(true); 10709 } 10710 10711 /** 10712 * Gets the background drawable 10713 * @return The drawable used as the background for this view, if any. 10714 */ 10715 public Drawable getBackground() { 10716 return mBGDrawable; 10717 } 10718 10719 /** 10720 * Sets the padding. The view may add on the space required to display 10721 * the scrollbars, depending on the style and visibility of the scrollbars. 10722 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 10723 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 10724 * from the values set in this call. 10725 * 10726 * @attr ref android.R.styleable#View_padding 10727 * @attr ref android.R.styleable#View_paddingBottom 10728 * @attr ref android.R.styleable#View_paddingLeft 10729 * @attr ref android.R.styleable#View_paddingRight 10730 * @attr ref android.R.styleable#View_paddingTop 10731 * @param left the left padding in pixels 10732 * @param top the top padding in pixels 10733 * @param right the right padding in pixels 10734 * @param bottom the bottom padding in pixels 10735 */ 10736 public void setPadding(int left, int top, int right, int bottom) { 10737 boolean changed = false; 10738 10739 mUserPaddingLeft = left; 10740 mUserPaddingRight = right; 10741 mUserPaddingBottom = bottom; 10742 10743 final int viewFlags = mViewFlags; 10744 10745 // Common case is there are no scroll bars. 10746 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 10747 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 10748 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 10749 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 10750 ? 0 : getVerticalScrollbarWidth(); 10751 switch (mVerticalScrollbarPosition) { 10752 case SCROLLBAR_POSITION_DEFAULT: 10753 case SCROLLBAR_POSITION_RIGHT: 10754 right += offset; 10755 break; 10756 case SCROLLBAR_POSITION_LEFT: 10757 left += offset; 10758 break; 10759 } 10760 } 10761 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 10762 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 10763 ? 0 : getHorizontalScrollbarHeight(); 10764 } 10765 } 10766 10767 if (mPaddingLeft != left) { 10768 changed = true; 10769 mPaddingLeft = left; 10770 } 10771 if (mPaddingTop != top) { 10772 changed = true; 10773 mPaddingTop = top; 10774 } 10775 if (mPaddingRight != right) { 10776 changed = true; 10777 mPaddingRight = right; 10778 } 10779 if (mPaddingBottom != bottom) { 10780 changed = true; 10781 mPaddingBottom = bottom; 10782 } 10783 10784 if (changed) { 10785 requestLayout(); 10786 } 10787 } 10788 10789 /** 10790 * Returns the top padding of this view. 10791 * 10792 * @return the top padding in pixels 10793 */ 10794 public int getPaddingTop() { 10795 return mPaddingTop; 10796 } 10797 10798 /** 10799 * Returns the bottom padding of this view. If there are inset and enabled 10800 * scrollbars, this value may include the space required to display the 10801 * scrollbars as well. 10802 * 10803 * @return the bottom padding in pixels 10804 */ 10805 public int getPaddingBottom() { 10806 return mPaddingBottom; 10807 } 10808 10809 /** 10810 * Returns the left padding of this view. If there are inset and enabled 10811 * scrollbars, this value may include the space required to display the 10812 * scrollbars as well. 10813 * 10814 * @return the left padding in pixels 10815 */ 10816 public int getPaddingLeft() { 10817 return mPaddingLeft; 10818 } 10819 10820 /** 10821 * Returns the right padding of this view. If there are inset and enabled 10822 * scrollbars, this value may include the space required to display the 10823 * scrollbars as well. 10824 * 10825 * @return the right padding in pixels 10826 */ 10827 public int getPaddingRight() { 10828 return mPaddingRight; 10829 } 10830 10831 /** 10832 * Changes the selection state of this view. A view can be selected or not. 10833 * Note that selection is not the same as focus. Views are typically 10834 * selected in the context of an AdapterView like ListView or GridView; 10835 * the selected view is the view that is highlighted. 10836 * 10837 * @param selected true if the view must be selected, false otherwise 10838 */ 10839 public void setSelected(boolean selected) { 10840 if (((mPrivateFlags & SELECTED) != 0) != selected) { 10841 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 10842 if (!selected) resetPressedState(); 10843 invalidate(true); 10844 refreshDrawableState(); 10845 dispatchSetSelected(selected); 10846 } 10847 } 10848 10849 /** 10850 * Dispatch setSelected to all of this View's children. 10851 * 10852 * @see #setSelected(boolean) 10853 * 10854 * @param selected The new selected state 10855 */ 10856 protected void dispatchSetSelected(boolean selected) { 10857 } 10858 10859 /** 10860 * Indicates the selection state of this view. 10861 * 10862 * @return true if the view is selected, false otherwise 10863 */ 10864 @ViewDebug.ExportedProperty 10865 public boolean isSelected() { 10866 return (mPrivateFlags & SELECTED) != 0; 10867 } 10868 10869 /** 10870 * Changes the activated state of this view. A view can be activated or not. 10871 * Note that activation is not the same as selection. Selection is 10872 * a transient property, representing the view (hierarchy) the user is 10873 * currently interacting with. Activation is a longer-term state that the 10874 * user can move views in and out of. For example, in a list view with 10875 * single or multiple selection enabled, the views in the current selection 10876 * set are activated. (Um, yeah, we are deeply sorry about the terminology 10877 * here.) The activated state is propagated down to children of the view it 10878 * is set on. 10879 * 10880 * @param activated true if the view must be activated, false otherwise 10881 */ 10882 public void setActivated(boolean activated) { 10883 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 10884 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 10885 invalidate(true); 10886 refreshDrawableState(); 10887 dispatchSetActivated(activated); 10888 } 10889 } 10890 10891 /** 10892 * Dispatch setActivated to all of this View's children. 10893 * 10894 * @see #setActivated(boolean) 10895 * 10896 * @param activated The new activated state 10897 */ 10898 protected void dispatchSetActivated(boolean activated) { 10899 } 10900 10901 /** 10902 * Indicates the activation state of this view. 10903 * 10904 * @return true if the view is activated, false otherwise 10905 */ 10906 @ViewDebug.ExportedProperty 10907 public boolean isActivated() { 10908 return (mPrivateFlags & ACTIVATED) != 0; 10909 } 10910 10911 /** 10912 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 10913 * observer can be used to get notifications when global events, like 10914 * layout, happen. 10915 * 10916 * The returned ViewTreeObserver observer is not guaranteed to remain 10917 * valid for the lifetime of this View. If the caller of this method keeps 10918 * a long-lived reference to ViewTreeObserver, it should always check for 10919 * the return value of {@link ViewTreeObserver#isAlive()}. 10920 * 10921 * @return The ViewTreeObserver for this view's hierarchy. 10922 */ 10923 public ViewTreeObserver getViewTreeObserver() { 10924 if (mAttachInfo != null) { 10925 return mAttachInfo.mTreeObserver; 10926 } 10927 if (mFloatingTreeObserver == null) { 10928 mFloatingTreeObserver = new ViewTreeObserver(); 10929 } 10930 return mFloatingTreeObserver; 10931 } 10932 10933 /** 10934 * <p>Finds the topmost view in the current view hierarchy.</p> 10935 * 10936 * @return the topmost view containing this view 10937 */ 10938 public View getRootView() { 10939 if (mAttachInfo != null) { 10940 final View v = mAttachInfo.mRootView; 10941 if (v != null) { 10942 return v; 10943 } 10944 } 10945 10946 View parent = this; 10947 10948 while (parent.mParent != null && parent.mParent instanceof View) { 10949 parent = (View) parent.mParent; 10950 } 10951 10952 return parent; 10953 } 10954 10955 /** 10956 * <p>Computes the coordinates of this view on the screen. The argument 10957 * must be an array of two integers. After the method returns, the array 10958 * contains the x and y location in that order.</p> 10959 * 10960 * @param location an array of two integers in which to hold the coordinates 10961 */ 10962 public void getLocationOnScreen(int[] location) { 10963 getLocationInWindow(location); 10964 10965 final AttachInfo info = mAttachInfo; 10966 if (info != null) { 10967 location[0] += info.mWindowLeft; 10968 location[1] += info.mWindowTop; 10969 } 10970 } 10971 10972 /** 10973 * <p>Computes the coordinates of this view in its window. The argument 10974 * must be an array of two integers. After the method returns, the array 10975 * contains the x and y location in that order.</p> 10976 * 10977 * @param location an array of two integers in which to hold the coordinates 10978 */ 10979 public void getLocationInWindow(int[] location) { 10980 if (location == null || location.length < 2) { 10981 throw new IllegalArgumentException("location must be an array of " 10982 + "two integers"); 10983 } 10984 10985 location[0] = mLeft + (int) (mTranslationX + 0.5f); 10986 location[1] = mTop + (int) (mTranslationY + 0.5f); 10987 10988 ViewParent viewParent = mParent; 10989 while (viewParent instanceof View) { 10990 final View view = (View)viewParent; 10991 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 10992 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 10993 viewParent = view.mParent; 10994 } 10995 10996 if (viewParent instanceof ViewAncestor) { 10997 // *cough* 10998 final ViewAncestor vr = (ViewAncestor)viewParent; 10999 location[1] -= vr.mCurScrollY; 11000 } 11001 } 11002 11003 /** 11004 * {@hide} 11005 * @param id the id of the view to be found 11006 * @return the view of the specified id, null if cannot be found 11007 */ 11008 protected View findViewTraversal(int id) { 11009 if (id == mID) { 11010 return this; 11011 } 11012 return null; 11013 } 11014 11015 /** 11016 * {@hide} 11017 * @param tag the tag of the view to be found 11018 * @return the view of specified tag, null if cannot be found 11019 */ 11020 protected View findViewWithTagTraversal(Object tag) { 11021 if (tag != null && tag.equals(mTag)) { 11022 return this; 11023 } 11024 return null; 11025 } 11026 11027 /** 11028 * {@hide} 11029 * @param predicate The predicate to evaluate. 11030 * @return The first view that matches the predicate or null. 11031 */ 11032 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 11033 if (predicate.apply(this)) { 11034 return this; 11035 } 11036 return null; 11037 } 11038 11039 /** 11040 * Look for a child view with the given id. If this view has the given 11041 * id, return this view. 11042 * 11043 * @param id The id to search for. 11044 * @return The view that has the given id in the hierarchy or null 11045 */ 11046 public final View findViewById(int id) { 11047 if (id < 0) { 11048 return null; 11049 } 11050 return findViewTraversal(id); 11051 } 11052 11053 /** 11054 * Look for a child view with the given tag. If this view has the given 11055 * tag, return this view. 11056 * 11057 * @param tag The tag to search for, using "tag.equals(getTag())". 11058 * @return The View that has the given tag in the hierarchy or null 11059 */ 11060 public final View findViewWithTag(Object tag) { 11061 if (tag == null) { 11062 return null; 11063 } 11064 return findViewWithTagTraversal(tag); 11065 } 11066 11067 /** 11068 * {@hide} 11069 * Look for a child view that matches the specified predicate. 11070 * If this view matches the predicate, return this view. 11071 * 11072 * @param predicate The predicate to evaluate. 11073 * @return The first view that matches the predicate or null. 11074 */ 11075 public final View findViewByPredicate(Predicate<View> predicate) { 11076 return findViewByPredicateTraversal(predicate); 11077 } 11078 11079 /** 11080 * Sets the identifier for this view. The identifier does not have to be 11081 * unique in this view's hierarchy. The identifier should be a positive 11082 * number. 11083 * 11084 * @see #NO_ID 11085 * @see #getId() 11086 * @see #findViewById(int) 11087 * 11088 * @param id a number used to identify the view 11089 * 11090 * @attr ref android.R.styleable#View_id 11091 */ 11092 public void setId(int id) { 11093 mID = id; 11094 } 11095 11096 /** 11097 * {@hide} 11098 * 11099 * @param isRoot true if the view belongs to the root namespace, false 11100 * otherwise 11101 */ 11102 public void setIsRootNamespace(boolean isRoot) { 11103 if (isRoot) { 11104 mPrivateFlags |= IS_ROOT_NAMESPACE; 11105 } else { 11106 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 11107 } 11108 } 11109 11110 /** 11111 * {@hide} 11112 * 11113 * @return true if the view belongs to the root namespace, false otherwise 11114 */ 11115 public boolean isRootNamespace() { 11116 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 11117 } 11118 11119 /** 11120 * Returns this view's identifier. 11121 * 11122 * @return a positive integer used to identify the view or {@link #NO_ID} 11123 * if the view has no ID 11124 * 11125 * @see #setId(int) 11126 * @see #findViewById(int) 11127 * @attr ref android.R.styleable#View_id 11128 */ 11129 @ViewDebug.CapturedViewProperty 11130 public int getId() { 11131 return mID; 11132 } 11133 11134 /** 11135 * Returns this view's tag. 11136 * 11137 * @return the Object stored in this view as a tag 11138 * 11139 * @see #setTag(Object) 11140 * @see #getTag(int) 11141 */ 11142 @ViewDebug.ExportedProperty 11143 public Object getTag() { 11144 return mTag; 11145 } 11146 11147 /** 11148 * Sets the tag associated with this view. A tag can be used to mark 11149 * a view in its hierarchy and does not have to be unique within the 11150 * hierarchy. Tags can also be used to store data within a view without 11151 * resorting to another data structure. 11152 * 11153 * @param tag an Object to tag the view with 11154 * 11155 * @see #getTag() 11156 * @see #setTag(int, Object) 11157 */ 11158 public void setTag(final Object tag) { 11159 mTag = tag; 11160 } 11161 11162 /** 11163 * Returns the tag associated with this view and the specified key. 11164 * 11165 * @param key The key identifying the tag 11166 * 11167 * @return the Object stored in this view as a tag 11168 * 11169 * @see #setTag(int, Object) 11170 * @see #getTag() 11171 */ 11172 public Object getTag(int key) { 11173 SparseArray<Object> tags = null; 11174 synchronized (sTagsLock) { 11175 if (sTags != null) { 11176 tags = sTags.get(this); 11177 } 11178 } 11179 11180 if (tags != null) return tags.get(key); 11181 return null; 11182 } 11183 11184 /** 11185 * Sets a tag associated with this view and a key. A tag can be used 11186 * to mark a view in its hierarchy and does not have to be unique within 11187 * the hierarchy. Tags can also be used to store data within a view 11188 * without resorting to another data structure. 11189 * 11190 * The specified key should be an id declared in the resources of the 11191 * application to ensure it is unique (see the <a 11192 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 11193 * Keys identified as belonging to 11194 * the Android framework or not associated with any package will cause 11195 * an {@link IllegalArgumentException} to be thrown. 11196 * 11197 * @param key The key identifying the tag 11198 * @param tag An Object to tag the view with 11199 * 11200 * @throws IllegalArgumentException If they specified key is not valid 11201 * 11202 * @see #setTag(Object) 11203 * @see #getTag(int) 11204 */ 11205 public void setTag(int key, final Object tag) { 11206 // If the package id is 0x00 or 0x01, it's either an undefined package 11207 // or a framework id 11208 if ((key >>> 24) < 2) { 11209 throw new IllegalArgumentException("The key must be an application-specific " 11210 + "resource id."); 11211 } 11212 11213 setTagInternal(this, key, tag); 11214 } 11215 11216 /** 11217 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 11218 * framework id. 11219 * 11220 * @hide 11221 */ 11222 public void setTagInternal(int key, Object tag) { 11223 if ((key >>> 24) != 0x1) { 11224 throw new IllegalArgumentException("The key must be a framework-specific " 11225 + "resource id."); 11226 } 11227 11228 setTagInternal(this, key, tag); 11229 } 11230 11231 private static void setTagInternal(View view, int key, Object tag) { 11232 SparseArray<Object> tags = null; 11233 synchronized (sTagsLock) { 11234 if (sTags == null) { 11235 sTags = new WeakHashMap<View, SparseArray<Object>>(); 11236 } else { 11237 tags = sTags.get(view); 11238 } 11239 } 11240 11241 if (tags == null) { 11242 tags = new SparseArray<Object>(2); 11243 synchronized (sTagsLock) { 11244 sTags.put(view, tags); 11245 } 11246 } 11247 11248 tags.put(key, tag); 11249 } 11250 11251 /** 11252 * @param consistency The type of consistency. See ViewDebug for more information. 11253 * 11254 * @hide 11255 */ 11256 protected boolean dispatchConsistencyCheck(int consistency) { 11257 return onConsistencyCheck(consistency); 11258 } 11259 11260 /** 11261 * Method that subclasses should implement to check their consistency. The type of 11262 * consistency check is indicated by the bit field passed as a parameter. 11263 * 11264 * @param consistency The type of consistency. See ViewDebug for more information. 11265 * 11266 * @throws IllegalStateException if the view is in an inconsistent state. 11267 * 11268 * @hide 11269 */ 11270 protected boolean onConsistencyCheck(int consistency) { 11271 boolean result = true; 11272 11273 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 11274 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 11275 11276 if (checkLayout) { 11277 if (getParent() == null) { 11278 result = false; 11279 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 11280 "View " + this + " does not have a parent."); 11281 } 11282 11283 if (mAttachInfo == null) { 11284 result = false; 11285 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 11286 "View " + this + " is not attached to a window."); 11287 } 11288 } 11289 11290 if (checkDrawing) { 11291 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 11292 // from their draw() method 11293 11294 if ((mPrivateFlags & DRAWN) != DRAWN && 11295 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 11296 result = false; 11297 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 11298 "View " + this + " was invalidated but its drawing cache is valid."); 11299 } 11300 } 11301 11302 return result; 11303 } 11304 11305 /** 11306 * Prints information about this view in the log output, with the tag 11307 * {@link #VIEW_LOG_TAG}. 11308 * 11309 * @hide 11310 */ 11311 public void debug() { 11312 debug(0); 11313 } 11314 11315 /** 11316 * Prints information about this view in the log output, with the tag 11317 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 11318 * indentation defined by the <code>depth</code>. 11319 * 11320 * @param depth the indentation level 11321 * 11322 * @hide 11323 */ 11324 protected void debug(int depth) { 11325 String output = debugIndent(depth - 1); 11326 11327 output += "+ " + this; 11328 int id = getId(); 11329 if (id != -1) { 11330 output += " (id=" + id + ")"; 11331 } 11332 Object tag = getTag(); 11333 if (tag != null) { 11334 output += " (tag=" + tag + ")"; 11335 } 11336 Log.d(VIEW_LOG_TAG, output); 11337 11338 if ((mPrivateFlags & FOCUSED) != 0) { 11339 output = debugIndent(depth) + " FOCUSED"; 11340 Log.d(VIEW_LOG_TAG, output); 11341 } 11342 11343 output = debugIndent(depth); 11344 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 11345 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 11346 + "} "; 11347 Log.d(VIEW_LOG_TAG, output); 11348 11349 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 11350 || mPaddingBottom != 0) { 11351 output = debugIndent(depth); 11352 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 11353 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 11354 Log.d(VIEW_LOG_TAG, output); 11355 } 11356 11357 output = debugIndent(depth); 11358 output += "mMeasureWidth=" + mMeasuredWidth + 11359 " mMeasureHeight=" + mMeasuredHeight; 11360 Log.d(VIEW_LOG_TAG, output); 11361 11362 output = debugIndent(depth); 11363 if (mLayoutParams == null) { 11364 output += "BAD! no layout params"; 11365 } else { 11366 output = mLayoutParams.debug(output); 11367 } 11368 Log.d(VIEW_LOG_TAG, output); 11369 11370 output = debugIndent(depth); 11371 output += "flags={"; 11372 output += View.printFlags(mViewFlags); 11373 output += "}"; 11374 Log.d(VIEW_LOG_TAG, output); 11375 11376 output = debugIndent(depth); 11377 output += "privateFlags={"; 11378 output += View.printPrivateFlags(mPrivateFlags); 11379 output += "}"; 11380 Log.d(VIEW_LOG_TAG, output); 11381 } 11382 11383 /** 11384 * Creates an string of whitespaces used for indentation. 11385 * 11386 * @param depth the indentation level 11387 * @return a String containing (depth * 2 + 3) * 2 white spaces 11388 * 11389 * @hide 11390 */ 11391 protected static String debugIndent(int depth) { 11392 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 11393 for (int i = 0; i < (depth * 2) + 3; i++) { 11394 spaces.append(' ').append(' '); 11395 } 11396 return spaces.toString(); 11397 } 11398 11399 /** 11400 * <p>Return the offset of the widget's text baseline from the widget's top 11401 * boundary. If this widget does not support baseline alignment, this 11402 * method returns -1. </p> 11403 * 11404 * @return the offset of the baseline within the widget's bounds or -1 11405 * if baseline alignment is not supported 11406 */ 11407 @ViewDebug.ExportedProperty(category = "layout") 11408 public int getBaseline() { 11409 return -1; 11410 } 11411 11412 /** 11413 * Call this when something has changed which has invalidated the 11414 * layout of this view. This will schedule a layout pass of the view 11415 * tree. 11416 */ 11417 public void requestLayout() { 11418 if (ViewDebug.TRACE_HIERARCHY) { 11419 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 11420 } 11421 11422 mPrivateFlags |= FORCE_LAYOUT; 11423 mPrivateFlags |= INVALIDATED; 11424 11425 if (mParent != null && !mParent.isLayoutRequested()) { 11426 mParent.requestLayout(); 11427 } 11428 } 11429 11430 /** 11431 * Forces this view to be laid out during the next layout pass. 11432 * This method does not call requestLayout() or forceLayout() 11433 * on the parent. 11434 */ 11435 public void forceLayout() { 11436 mPrivateFlags |= FORCE_LAYOUT; 11437 mPrivateFlags |= INVALIDATED; 11438 } 11439 11440 /** 11441 * <p> 11442 * This is called to find out how big a view should be. The parent 11443 * supplies constraint information in the width and height parameters. 11444 * </p> 11445 * 11446 * <p> 11447 * The actual mesurement work of a view is performed in 11448 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 11449 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 11450 * </p> 11451 * 11452 * 11453 * @param widthMeasureSpec Horizontal space requirements as imposed by the 11454 * parent 11455 * @param heightMeasureSpec Vertical space requirements as imposed by the 11456 * parent 11457 * 11458 * @see #onMeasure(int, int) 11459 */ 11460 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 11461 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 11462 widthMeasureSpec != mOldWidthMeasureSpec || 11463 heightMeasureSpec != mOldHeightMeasureSpec) { 11464 11465 // first clears the measured dimension flag 11466 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 11467 11468 if (ViewDebug.TRACE_HIERARCHY) { 11469 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 11470 } 11471 11472 // measure ourselves, this should set the measured dimension flag back 11473 onMeasure(widthMeasureSpec, heightMeasureSpec); 11474 11475 // flag not set, setMeasuredDimension() was not invoked, we raise 11476 // an exception to warn the developer 11477 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 11478 throw new IllegalStateException("onMeasure() did not set the" 11479 + " measured dimension by calling" 11480 + " setMeasuredDimension()"); 11481 } 11482 11483 mPrivateFlags |= LAYOUT_REQUIRED; 11484 } 11485 11486 mOldWidthMeasureSpec = widthMeasureSpec; 11487 mOldHeightMeasureSpec = heightMeasureSpec; 11488 } 11489 11490 /** 11491 * <p> 11492 * Measure the view and its content to determine the measured width and the 11493 * measured height. This method is invoked by {@link #measure(int, int)} and 11494 * should be overriden by subclasses to provide accurate and efficient 11495 * measurement of their contents. 11496 * </p> 11497 * 11498 * <p> 11499 * <strong>CONTRACT:</strong> When overriding this method, you 11500 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 11501 * measured width and height of this view. Failure to do so will trigger an 11502 * <code>IllegalStateException</code>, thrown by 11503 * {@link #measure(int, int)}. Calling the superclass' 11504 * {@link #onMeasure(int, int)} is a valid use. 11505 * </p> 11506 * 11507 * <p> 11508 * The base class implementation of measure defaults to the background size, 11509 * unless a larger size is allowed by the MeasureSpec. Subclasses should 11510 * override {@link #onMeasure(int, int)} to provide better measurements of 11511 * their content. 11512 * </p> 11513 * 11514 * <p> 11515 * If this method is overridden, it is the subclass's responsibility to make 11516 * sure the measured height and width are at least the view's minimum height 11517 * and width ({@link #getSuggestedMinimumHeight()} and 11518 * {@link #getSuggestedMinimumWidth()}). 11519 * </p> 11520 * 11521 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 11522 * The requirements are encoded with 11523 * {@link android.view.View.MeasureSpec}. 11524 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 11525 * The requirements are encoded with 11526 * {@link android.view.View.MeasureSpec}. 11527 * 11528 * @see #getMeasuredWidth() 11529 * @see #getMeasuredHeight() 11530 * @see #setMeasuredDimension(int, int) 11531 * @see #getSuggestedMinimumHeight() 11532 * @see #getSuggestedMinimumWidth() 11533 * @see android.view.View.MeasureSpec#getMode(int) 11534 * @see android.view.View.MeasureSpec#getSize(int) 11535 */ 11536 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 11537 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 11538 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 11539 } 11540 11541 /** 11542 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 11543 * measured width and measured height. Failing to do so will trigger an 11544 * exception at measurement time.</p> 11545 * 11546 * @param measuredWidth The measured width of this view. May be a complex 11547 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 11548 * {@link #MEASURED_STATE_TOO_SMALL}. 11549 * @param measuredHeight The measured height of this view. May be a complex 11550 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 11551 * {@link #MEASURED_STATE_TOO_SMALL}. 11552 */ 11553 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 11554 mMeasuredWidth = measuredWidth; 11555 mMeasuredHeight = measuredHeight; 11556 11557 mPrivateFlags |= MEASURED_DIMENSION_SET; 11558 } 11559 11560 /** 11561 * Merge two states as returned by {@link #getMeasuredState()}. 11562 * @param curState The current state as returned from a view or the result 11563 * of combining multiple views. 11564 * @param newState The new view state to combine. 11565 * @return Returns a new integer reflecting the combination of the two 11566 * states. 11567 */ 11568 public static int combineMeasuredStates(int curState, int newState) { 11569 return curState | newState; 11570 } 11571 11572 /** 11573 * Version of {@link #resolveSizeAndState(int, int, int)} 11574 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 11575 */ 11576 public static int resolveSize(int size, int measureSpec) { 11577 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 11578 } 11579 11580 /** 11581 * Utility to reconcile a desired size and state, with constraints imposed 11582 * by a MeasureSpec. Will take the desired size, unless a different size 11583 * is imposed by the constraints. The returned value is a compound integer, 11584 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 11585 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 11586 * size is smaller than the size the view wants to be. 11587 * 11588 * @param size How big the view wants to be 11589 * @param measureSpec Constraints imposed by the parent 11590 * @return Size information bit mask as defined by 11591 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 11592 */ 11593 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 11594 int result = size; 11595 int specMode = MeasureSpec.getMode(measureSpec); 11596 int specSize = MeasureSpec.getSize(measureSpec); 11597 switch (specMode) { 11598 case MeasureSpec.UNSPECIFIED: 11599 result = size; 11600 break; 11601 case MeasureSpec.AT_MOST: 11602 if (specSize < size) { 11603 result = specSize | MEASURED_STATE_TOO_SMALL; 11604 } else { 11605 result = size; 11606 } 11607 break; 11608 case MeasureSpec.EXACTLY: 11609 result = specSize; 11610 break; 11611 } 11612 return result | (childMeasuredState&MEASURED_STATE_MASK); 11613 } 11614 11615 /** 11616 * Utility to return a default size. Uses the supplied size if the 11617 * MeasureSpec imposed no contraints. Will get larger if allowed 11618 * by the MeasureSpec. 11619 * 11620 * @param size Default size for this view 11621 * @param measureSpec Constraints imposed by the parent 11622 * @return The size this view should be. 11623 */ 11624 public static int getDefaultSize(int size, int measureSpec) { 11625 int result = size; 11626 int specMode = MeasureSpec.getMode(measureSpec); 11627 int specSize = MeasureSpec.getSize(measureSpec); 11628 11629 switch (specMode) { 11630 case MeasureSpec.UNSPECIFIED: 11631 result = size; 11632 break; 11633 case MeasureSpec.AT_MOST: 11634 case MeasureSpec.EXACTLY: 11635 result = specSize; 11636 break; 11637 } 11638 return result; 11639 } 11640 11641 /** 11642 * Returns the suggested minimum height that the view should use. This 11643 * returns the maximum of the view's minimum height 11644 * and the background's minimum height 11645 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 11646 * <p> 11647 * When being used in {@link #onMeasure(int, int)}, the caller should still 11648 * ensure the returned height is within the requirements of the parent. 11649 * 11650 * @return The suggested minimum height of the view. 11651 */ 11652 protected int getSuggestedMinimumHeight() { 11653 int suggestedMinHeight = mMinHeight; 11654 11655 if (mBGDrawable != null) { 11656 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 11657 if (suggestedMinHeight < bgMinHeight) { 11658 suggestedMinHeight = bgMinHeight; 11659 } 11660 } 11661 11662 return suggestedMinHeight; 11663 } 11664 11665 /** 11666 * Returns the suggested minimum width that the view should use. This 11667 * returns the maximum of the view's minimum width) 11668 * and the background's minimum width 11669 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 11670 * <p> 11671 * When being used in {@link #onMeasure(int, int)}, the caller should still 11672 * ensure the returned width is within the requirements of the parent. 11673 * 11674 * @return The suggested minimum width of the view. 11675 */ 11676 protected int getSuggestedMinimumWidth() { 11677 int suggestedMinWidth = mMinWidth; 11678 11679 if (mBGDrawable != null) { 11680 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 11681 if (suggestedMinWidth < bgMinWidth) { 11682 suggestedMinWidth = bgMinWidth; 11683 } 11684 } 11685 11686 return suggestedMinWidth; 11687 } 11688 11689 /** 11690 * Sets the minimum height of the view. It is not guaranteed the view will 11691 * be able to achieve this minimum height (for example, if its parent layout 11692 * constrains it with less available height). 11693 * 11694 * @param minHeight The minimum height the view will try to be. 11695 */ 11696 public void setMinimumHeight(int minHeight) { 11697 mMinHeight = minHeight; 11698 } 11699 11700 /** 11701 * Sets the minimum width of the view. It is not guaranteed the view will 11702 * be able to achieve this minimum width (for example, if its parent layout 11703 * constrains it with less available width). 11704 * 11705 * @param minWidth The minimum width the view will try to be. 11706 */ 11707 public void setMinimumWidth(int minWidth) { 11708 mMinWidth = minWidth; 11709 } 11710 11711 /** 11712 * Get the animation currently associated with this view. 11713 * 11714 * @return The animation that is currently playing or 11715 * scheduled to play for this view. 11716 */ 11717 public Animation getAnimation() { 11718 return mCurrentAnimation; 11719 } 11720 11721 /** 11722 * Start the specified animation now. 11723 * 11724 * @param animation the animation to start now 11725 */ 11726 public void startAnimation(Animation animation) { 11727 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 11728 setAnimation(animation); 11729 invalidateParentCaches(); 11730 invalidate(true); 11731 } 11732 11733 /** 11734 * Cancels any animations for this view. 11735 */ 11736 public void clearAnimation() { 11737 if (mCurrentAnimation != null) { 11738 mCurrentAnimation.detach(); 11739 } 11740 mCurrentAnimation = null; 11741 invalidateParentIfNeeded(); 11742 } 11743 11744 /** 11745 * Sets the next animation to play for this view. 11746 * If you want the animation to play immediately, use 11747 * startAnimation. This method provides allows fine-grained 11748 * control over the start time and invalidation, but you 11749 * must make sure that 1) the animation has a start time set, and 11750 * 2) the view will be invalidated when the animation is supposed to 11751 * start. 11752 * 11753 * @param animation The next animation, or null. 11754 */ 11755 public void setAnimation(Animation animation) { 11756 mCurrentAnimation = animation; 11757 if (animation != null) { 11758 animation.reset(); 11759 } 11760 } 11761 11762 /** 11763 * Invoked by a parent ViewGroup to notify the start of the animation 11764 * currently associated with this view. If you override this method, 11765 * always call super.onAnimationStart(); 11766 * 11767 * @see #setAnimation(android.view.animation.Animation) 11768 * @see #getAnimation() 11769 */ 11770 protected void onAnimationStart() { 11771 mPrivateFlags |= ANIMATION_STARTED; 11772 } 11773 11774 /** 11775 * Invoked by a parent ViewGroup to notify the end of the animation 11776 * currently associated with this view. If you override this method, 11777 * always call super.onAnimationEnd(); 11778 * 11779 * @see #setAnimation(android.view.animation.Animation) 11780 * @see #getAnimation() 11781 */ 11782 protected void onAnimationEnd() { 11783 mPrivateFlags &= ~ANIMATION_STARTED; 11784 } 11785 11786 /** 11787 * Invoked if there is a Transform that involves alpha. Subclass that can 11788 * draw themselves with the specified alpha should return true, and then 11789 * respect that alpha when their onDraw() is called. If this returns false 11790 * then the view may be redirected to draw into an offscreen buffer to 11791 * fulfill the request, which will look fine, but may be slower than if the 11792 * subclass handles it internally. The default implementation returns false. 11793 * 11794 * @param alpha The alpha (0..255) to apply to the view's drawing 11795 * @return true if the view can draw with the specified alpha. 11796 */ 11797 protected boolean onSetAlpha(int alpha) { 11798 return false; 11799 } 11800 11801 /** 11802 * This is used by the RootView to perform an optimization when 11803 * the view hierarchy contains one or several SurfaceView. 11804 * SurfaceView is always considered transparent, but its children are not, 11805 * therefore all View objects remove themselves from the global transparent 11806 * region (passed as a parameter to this function). 11807 * 11808 * @param region The transparent region for this ViewAncestor (window). 11809 * 11810 * @return Returns true if the effective visibility of the view at this 11811 * point is opaque, regardless of the transparent region; returns false 11812 * if it is possible for underlying windows to be seen behind the view. 11813 * 11814 * {@hide} 11815 */ 11816 public boolean gatherTransparentRegion(Region region) { 11817 final AttachInfo attachInfo = mAttachInfo; 11818 if (region != null && attachInfo != null) { 11819 final int pflags = mPrivateFlags; 11820 if ((pflags & SKIP_DRAW) == 0) { 11821 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 11822 // remove it from the transparent region. 11823 final int[] location = attachInfo.mTransparentLocation; 11824 getLocationInWindow(location); 11825 region.op(location[0], location[1], location[0] + mRight - mLeft, 11826 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 11827 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 11828 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 11829 // exists, so we remove the background drawable's non-transparent 11830 // parts from this transparent region. 11831 applyDrawableToTransparentRegion(mBGDrawable, region); 11832 } 11833 } 11834 return true; 11835 } 11836 11837 /** 11838 * Play a sound effect for this view. 11839 * 11840 * <p>The framework will play sound effects for some built in actions, such as 11841 * clicking, but you may wish to play these effects in your widget, 11842 * for instance, for internal navigation. 11843 * 11844 * <p>The sound effect will only be played if sound effects are enabled by the user, and 11845 * {@link #isSoundEffectsEnabled()} is true. 11846 * 11847 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 11848 */ 11849 public void playSoundEffect(int soundConstant) { 11850 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 11851 return; 11852 } 11853 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 11854 } 11855 11856 /** 11857 * BZZZTT!!1! 11858 * 11859 * <p>Provide haptic feedback to the user for this view. 11860 * 11861 * <p>The framework will provide haptic feedback for some built in actions, 11862 * such as long presses, but you may wish to provide feedback for your 11863 * own widget. 11864 * 11865 * <p>The feedback will only be performed if 11866 * {@link #isHapticFeedbackEnabled()} is true. 11867 * 11868 * @param feedbackConstant One of the constants defined in 11869 * {@link HapticFeedbackConstants} 11870 */ 11871 public boolean performHapticFeedback(int feedbackConstant) { 11872 return performHapticFeedback(feedbackConstant, 0); 11873 } 11874 11875 /** 11876 * BZZZTT!!1! 11877 * 11878 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 11879 * 11880 * @param feedbackConstant One of the constants defined in 11881 * {@link HapticFeedbackConstants} 11882 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 11883 */ 11884 public boolean performHapticFeedback(int feedbackConstant, int flags) { 11885 if (mAttachInfo == null) { 11886 return false; 11887 } 11888 //noinspection SimplifiableIfStatement 11889 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 11890 && !isHapticFeedbackEnabled()) { 11891 return false; 11892 } 11893 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 11894 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 11895 } 11896 11897 /** 11898 * Request that the visibility of the status bar be changed. 11899 * @param visibility Either {@link #STATUS_BAR_VISIBLE} or {@link #STATUS_BAR_HIDDEN}. 11900 */ 11901 public void setSystemUiVisibility(int visibility) { 11902 if (visibility != mSystemUiVisibility) { 11903 mSystemUiVisibility = visibility; 11904 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 11905 mParent.recomputeViewAttributes(this); 11906 } 11907 } 11908 } 11909 11910 /** 11911 * Returns the status bar visibility that this view has requested. 11912 * @return Either {@link #STATUS_BAR_VISIBLE} or {@link #STATUS_BAR_HIDDEN}. 11913 */ 11914 public int getSystemUiVisibility() { 11915 return mSystemUiVisibility; 11916 } 11917 11918 /** 11919 * Set a listener to receive callbacks when the visibility of the system bar changes. 11920 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 11921 */ 11922 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 11923 mOnSystemUiVisibilityChangeListener = l; 11924 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 11925 mParent.recomputeViewAttributes(this); 11926 } 11927 } 11928 11929 /** 11930 */ 11931 public void dispatchSystemUiVisibilityChanged(int visibility) { 11932 if (mOnSystemUiVisibilityChangeListener != null) { 11933 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 11934 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 11935 } 11936 } 11937 11938 /** 11939 * Creates an image that the system displays during the drag and drop 11940 * operation. This is called a "drag shadow". The default implementation 11941 * for a DragShadowBuilder based on a View returns an image that has exactly the same 11942 * appearance as the given View. The default also positions the center of the drag shadow 11943 * directly under the touch point. If no View is provided (the constructor with no parameters 11944 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 11945 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 11946 * default is an invisible drag shadow. 11947 * <p> 11948 * You are not required to use the View you provide to the constructor as the basis of the 11949 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 11950 * anything you want as the drag shadow. 11951 * </p> 11952 * <p> 11953 * You pass a DragShadowBuilder object to the system when you start the drag. The system 11954 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 11955 * size and position of the drag shadow. It uses this data to construct a 11956 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 11957 * so that your application can draw the shadow image in the Canvas. 11958 * </p> 11959 */ 11960 public static class DragShadowBuilder { 11961 private final WeakReference<View> mView; 11962 11963 /** 11964 * Constructs a shadow image builder based on a View. By default, the resulting drag 11965 * shadow will have the same appearance and dimensions as the View, with the touch point 11966 * over the center of the View. 11967 * @param view A View. Any View in scope can be used. 11968 */ 11969 public DragShadowBuilder(View view) { 11970 mView = new WeakReference<View>(view); 11971 } 11972 11973 /** 11974 * Construct a shadow builder object with no associated View. This 11975 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 11976 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 11977 * to supply the drag shadow's dimensions and appearance without 11978 * reference to any View object. If they are not overridden, then the result is an 11979 * invisible drag shadow. 11980 */ 11981 public DragShadowBuilder() { 11982 mView = new WeakReference<View>(null); 11983 } 11984 11985 /** 11986 * Returns the View object that had been passed to the 11987 * {@link #View.DragShadowBuilder(View)} 11988 * constructor. If that View parameter was {@code null} or if the 11989 * {@link #View.DragShadowBuilder()} 11990 * constructor was used to instantiate the builder object, this method will return 11991 * null. 11992 * 11993 * @return The View object associate with this builder object. 11994 */ 11995 @SuppressWarnings({"JavadocReference"}) 11996 final public View getView() { 11997 return mView.get(); 11998 } 11999 12000 /** 12001 * Provides the metrics for the shadow image. These include the dimensions of 12002 * the shadow image, and the point within that shadow that should 12003 * be centered under the touch location while dragging. 12004 * <p> 12005 * The default implementation sets the dimensions of the shadow to be the 12006 * same as the dimensions of the View itself and centers the shadow under 12007 * the touch point. 12008 * </p> 12009 * 12010 * @param shadowSize A {@link android.graphics.Point} containing the width and height 12011 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 12012 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 12013 * image. 12014 * 12015 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 12016 * shadow image that should be underneath the touch point during the drag and drop 12017 * operation. Your application must set {@link android.graphics.Point#x} to the 12018 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 12019 */ 12020 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 12021 final View view = mView.get(); 12022 if (view != null) { 12023 shadowSize.set(view.getWidth(), view.getHeight()); 12024 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 12025 } else { 12026 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 12027 } 12028 } 12029 12030 /** 12031 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 12032 * based on the dimensions it received from the 12033 * {@link #onProvideShadowMetrics(Point, Point)} callback. 12034 * 12035 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 12036 */ 12037 public void onDrawShadow(Canvas canvas) { 12038 final View view = mView.get(); 12039 if (view != null) { 12040 view.draw(canvas); 12041 } else { 12042 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 12043 } 12044 } 12045 } 12046 12047 /** 12048 * Starts a drag and drop operation. When your application calls this method, it passes a 12049 * {@link android.view.View.DragShadowBuilder} object to the system. The 12050 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 12051 * to get metrics for the drag shadow, and then calls the object's 12052 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 12053 * <p> 12054 * Once the system has the drag shadow, it begins the drag and drop operation by sending 12055 * drag events to all the View objects in your application that are currently visible. It does 12056 * this either by calling the View object's drag listener (an implementation of 12057 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 12058 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 12059 * Both are passed a {@link android.view.DragEvent} object that has a 12060 * {@link android.view.DragEvent#getAction()} value of 12061 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 12062 * </p> 12063 * <p> 12064 * Your application can invoke startDrag() on any attached View object. The View object does not 12065 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 12066 * be related to the View the user selected for dragging. 12067 * </p> 12068 * @param data A {@link android.content.ClipData} object pointing to the data to be 12069 * transferred by the drag and drop operation. 12070 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 12071 * drag shadow. 12072 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 12073 * drop operation. This Object is put into every DragEvent object sent by the system during the 12074 * current drag. 12075 * <p> 12076 * myLocalState is a lightweight mechanism for the sending information from the dragged View 12077 * to the target Views. For example, it can contain flags that differentiate between a 12078 * a copy operation and a move operation. 12079 * </p> 12080 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 12081 * so the parameter should be set to 0. 12082 * @return {@code true} if the method completes successfully, or 12083 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 12084 * do a drag, and so no drag operation is in progress. 12085 */ 12086 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 12087 Object myLocalState, int flags) { 12088 if (ViewDebug.DEBUG_DRAG) { 12089 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 12090 } 12091 boolean okay = false; 12092 12093 Point shadowSize = new Point(); 12094 Point shadowTouchPoint = new Point(); 12095 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 12096 12097 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 12098 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 12099 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 12100 } 12101 12102 if (ViewDebug.DEBUG_DRAG) { 12103 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 12104 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 12105 } 12106 Surface surface = new Surface(); 12107 try { 12108 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 12109 flags, shadowSize.x, shadowSize.y, surface); 12110 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 12111 + " surface=" + surface); 12112 if (token != null) { 12113 Canvas canvas = surface.lockCanvas(null); 12114 try { 12115 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 12116 shadowBuilder.onDrawShadow(canvas); 12117 } finally { 12118 surface.unlockCanvasAndPost(canvas); 12119 } 12120 12121 final ViewAncestor root = getViewAncestor(); 12122 12123 // Cache the local state object for delivery with DragEvents 12124 root.setLocalDragState(myLocalState); 12125 12126 // repurpose 'shadowSize' for the last touch point 12127 root.getLastTouchPoint(shadowSize); 12128 12129 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 12130 shadowSize.x, shadowSize.y, 12131 shadowTouchPoint.x, shadowTouchPoint.y, data); 12132 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 12133 } 12134 } catch (Exception e) { 12135 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 12136 surface.destroy(); 12137 } 12138 12139 return okay; 12140 } 12141 12142 /** 12143 * Handles drag events sent by the system following a call to 12144 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 12145 *<p> 12146 * When the system calls this method, it passes a 12147 * {@link android.view.DragEvent} object. A call to 12148 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 12149 * in DragEvent. The method uses these to determine what is happening in the drag and drop 12150 * operation. 12151 * @param event The {@link android.view.DragEvent} sent by the system. 12152 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 12153 * in DragEvent, indicating the type of drag event represented by this object. 12154 * @return {@code true} if the method was successful, otherwise {@code false}. 12155 * <p> 12156 * The method should return {@code true} in response to an action type of 12157 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 12158 * operation. 12159 * </p> 12160 * <p> 12161 * The method should also return {@code true} in response to an action type of 12162 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 12163 * {@code false} if it didn't. 12164 * </p> 12165 */ 12166 public boolean onDragEvent(DragEvent event) { 12167 return false; 12168 } 12169 12170 /** 12171 * Detects if this View is enabled and has a drag event listener. 12172 * If both are true, then it calls the drag event listener with the 12173 * {@link android.view.DragEvent} it received. If the drag event listener returns 12174 * {@code true}, then dispatchDragEvent() returns {@code true}. 12175 * <p> 12176 * For all other cases, the method calls the 12177 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 12178 * method and returns its result. 12179 * </p> 12180 * <p> 12181 * This ensures that a drag event is always consumed, even if the View does not have a drag 12182 * event listener. However, if the View has a listener and the listener returns true, then 12183 * onDragEvent() is not called. 12184 * </p> 12185 */ 12186 public boolean dispatchDragEvent(DragEvent event) { 12187 //noinspection SimplifiableIfStatement 12188 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 12189 && mOnDragListener.onDrag(this, event)) { 12190 return true; 12191 } 12192 return onDragEvent(event); 12193 } 12194 12195 boolean canAcceptDrag() { 12196 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 12197 } 12198 12199 /** 12200 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 12201 * it is ever exposed at all. 12202 * @hide 12203 */ 12204 public void onCloseSystemDialogs(String reason) { 12205 } 12206 12207 /** 12208 * Given a Drawable whose bounds have been set to draw into this view, 12209 * update a Region being computed for 12210 * {@link #gatherTransparentRegion(android.graphics.Region)} so 12211 * that any non-transparent parts of the Drawable are removed from the 12212 * given transparent region. 12213 * 12214 * @param dr The Drawable whose transparency is to be applied to the region. 12215 * @param region A Region holding the current transparency information, 12216 * where any parts of the region that are set are considered to be 12217 * transparent. On return, this region will be modified to have the 12218 * transparency information reduced by the corresponding parts of the 12219 * Drawable that are not transparent. 12220 * {@hide} 12221 */ 12222 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 12223 if (DBG) { 12224 Log.i("View", "Getting transparent region for: " + this); 12225 } 12226 final Region r = dr.getTransparentRegion(); 12227 final Rect db = dr.getBounds(); 12228 final AttachInfo attachInfo = mAttachInfo; 12229 if (r != null && attachInfo != null) { 12230 final int w = getRight()-getLeft(); 12231 final int h = getBottom()-getTop(); 12232 if (db.left > 0) { 12233 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 12234 r.op(0, 0, db.left, h, Region.Op.UNION); 12235 } 12236 if (db.right < w) { 12237 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 12238 r.op(db.right, 0, w, h, Region.Op.UNION); 12239 } 12240 if (db.top > 0) { 12241 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 12242 r.op(0, 0, w, db.top, Region.Op.UNION); 12243 } 12244 if (db.bottom < h) { 12245 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 12246 r.op(0, db.bottom, w, h, Region.Op.UNION); 12247 } 12248 final int[] location = attachInfo.mTransparentLocation; 12249 getLocationInWindow(location); 12250 r.translate(location[0], location[1]); 12251 region.op(r, Region.Op.INTERSECT); 12252 } else { 12253 region.op(db, Region.Op.DIFFERENCE); 12254 } 12255 } 12256 12257 private void checkForLongClick(int delayOffset) { 12258 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 12259 mHasPerformedLongPress = false; 12260 12261 if (mPendingCheckForLongPress == null) { 12262 mPendingCheckForLongPress = new CheckForLongPress(); 12263 } 12264 mPendingCheckForLongPress.rememberWindowAttachCount(); 12265 postDelayed(mPendingCheckForLongPress, 12266 ViewConfiguration.getLongPressTimeout() - delayOffset); 12267 } 12268 } 12269 12270 /** 12271 * Inflate a view from an XML resource. This convenience method wraps the {@link 12272 * LayoutInflater} class, which provides a full range of options for view inflation. 12273 * 12274 * @param context The Context object for your activity or application. 12275 * @param resource The resource ID to inflate 12276 * @param root A view group that will be the parent. Used to properly inflate the 12277 * layout_* parameters. 12278 * @see LayoutInflater 12279 */ 12280 public static View inflate(Context context, int resource, ViewGroup root) { 12281 LayoutInflater factory = LayoutInflater.from(context); 12282 return factory.inflate(resource, root); 12283 } 12284 12285 /** 12286 * Scroll the view with standard behavior for scrolling beyond the normal 12287 * content boundaries. Views that call this method should override 12288 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 12289 * results of an over-scroll operation. 12290 * 12291 * Views can use this method to handle any touch or fling-based scrolling. 12292 * 12293 * @param deltaX Change in X in pixels 12294 * @param deltaY Change in Y in pixels 12295 * @param scrollX Current X scroll value in pixels before applying deltaX 12296 * @param scrollY Current Y scroll value in pixels before applying deltaY 12297 * @param scrollRangeX Maximum content scroll range along the X axis 12298 * @param scrollRangeY Maximum content scroll range along the Y axis 12299 * @param maxOverScrollX Number of pixels to overscroll by in either direction 12300 * along the X axis. 12301 * @param maxOverScrollY Number of pixels to overscroll by in either direction 12302 * along the Y axis. 12303 * @param isTouchEvent true if this scroll operation is the result of a touch event. 12304 * @return true if scrolling was clamped to an over-scroll boundary along either 12305 * axis, false otherwise. 12306 */ 12307 @SuppressWarnings({"UnusedParameters"}) 12308 protected boolean overScrollBy(int deltaX, int deltaY, 12309 int scrollX, int scrollY, 12310 int scrollRangeX, int scrollRangeY, 12311 int maxOverScrollX, int maxOverScrollY, 12312 boolean isTouchEvent) { 12313 final int overScrollMode = mOverScrollMode; 12314 final boolean canScrollHorizontal = 12315 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 12316 final boolean canScrollVertical = 12317 computeVerticalScrollRange() > computeVerticalScrollExtent(); 12318 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 12319 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 12320 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 12321 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 12322 12323 int newScrollX = scrollX + deltaX; 12324 if (!overScrollHorizontal) { 12325 maxOverScrollX = 0; 12326 } 12327 12328 int newScrollY = scrollY + deltaY; 12329 if (!overScrollVertical) { 12330 maxOverScrollY = 0; 12331 } 12332 12333 // Clamp values if at the limits and record 12334 final int left = -maxOverScrollX; 12335 final int right = maxOverScrollX + scrollRangeX; 12336 final int top = -maxOverScrollY; 12337 final int bottom = maxOverScrollY + scrollRangeY; 12338 12339 boolean clampedX = false; 12340 if (newScrollX > right) { 12341 newScrollX = right; 12342 clampedX = true; 12343 } else if (newScrollX < left) { 12344 newScrollX = left; 12345 clampedX = true; 12346 } 12347 12348 boolean clampedY = false; 12349 if (newScrollY > bottom) { 12350 newScrollY = bottom; 12351 clampedY = true; 12352 } else if (newScrollY < top) { 12353 newScrollY = top; 12354 clampedY = true; 12355 } 12356 12357 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 12358 12359 return clampedX || clampedY; 12360 } 12361 12362 /** 12363 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 12364 * respond to the results of an over-scroll operation. 12365 * 12366 * @param scrollX New X scroll value in pixels 12367 * @param scrollY New Y scroll value in pixels 12368 * @param clampedX True if scrollX was clamped to an over-scroll boundary 12369 * @param clampedY True if scrollY was clamped to an over-scroll boundary 12370 */ 12371 protected void onOverScrolled(int scrollX, int scrollY, 12372 boolean clampedX, boolean clampedY) { 12373 // Intentionally empty. 12374 } 12375 12376 /** 12377 * Returns the over-scroll mode for this view. The result will be 12378 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 12379 * (allow over-scrolling only if the view content is larger than the container), 12380 * or {@link #OVER_SCROLL_NEVER}. 12381 * 12382 * @return This view's over-scroll mode. 12383 */ 12384 public int getOverScrollMode() { 12385 return mOverScrollMode; 12386 } 12387 12388 /** 12389 * Set the over-scroll mode for this view. Valid over-scroll modes are 12390 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 12391 * (allow over-scrolling only if the view content is larger than the container), 12392 * or {@link #OVER_SCROLL_NEVER}. 12393 * 12394 * Setting the over-scroll mode of a view will have an effect only if the 12395 * view is capable of scrolling. 12396 * 12397 * @param overScrollMode The new over-scroll mode for this view. 12398 */ 12399 public void setOverScrollMode(int overScrollMode) { 12400 if (overScrollMode != OVER_SCROLL_ALWAYS && 12401 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 12402 overScrollMode != OVER_SCROLL_NEVER) { 12403 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 12404 } 12405 mOverScrollMode = overScrollMode; 12406 } 12407 12408 /** 12409 * Gets a scale factor that determines the distance the view should scroll 12410 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 12411 * @return The vertical scroll scale factor. 12412 * @hide 12413 */ 12414 protected float getVerticalScrollFactor() { 12415 if (mVerticalScrollFactor == 0) { 12416 TypedValue outValue = new TypedValue(); 12417 if (!mContext.getTheme().resolveAttribute( 12418 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 12419 throw new IllegalStateException( 12420 "Expected theme to define listPreferredItemHeight."); 12421 } 12422 mVerticalScrollFactor = outValue.getDimension( 12423 mContext.getResources().getDisplayMetrics()); 12424 } 12425 return mVerticalScrollFactor; 12426 } 12427 12428 /** 12429 * Gets a scale factor that determines the distance the view should scroll 12430 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 12431 * @return The horizontal scroll scale factor. 12432 * @hide 12433 */ 12434 protected float getHorizontalScrollFactor() { 12435 // TODO: Should use something else. 12436 return getVerticalScrollFactor(); 12437 } 12438 12439 /** 12440 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 12441 * Each MeasureSpec represents a requirement for either the width or the height. 12442 * A MeasureSpec is comprised of a size and a mode. There are three possible 12443 * modes: 12444 * <dl> 12445 * <dt>UNSPECIFIED</dt> 12446 * <dd> 12447 * The parent has not imposed any constraint on the child. It can be whatever size 12448 * it wants. 12449 * </dd> 12450 * 12451 * <dt>EXACTLY</dt> 12452 * <dd> 12453 * The parent has determined an exact size for the child. The child is going to be 12454 * given those bounds regardless of how big it wants to be. 12455 * </dd> 12456 * 12457 * <dt>AT_MOST</dt> 12458 * <dd> 12459 * The child can be as large as it wants up to the specified size. 12460 * </dd> 12461 * </dl> 12462 * 12463 * MeasureSpecs are implemented as ints to reduce object allocation. This class 12464 * is provided to pack and unpack the <size, mode> tuple into the int. 12465 */ 12466 public static class MeasureSpec { 12467 private static final int MODE_SHIFT = 30; 12468 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 12469 12470 /** 12471 * Measure specification mode: The parent has not imposed any constraint 12472 * on the child. It can be whatever size it wants. 12473 */ 12474 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 12475 12476 /** 12477 * Measure specification mode: The parent has determined an exact size 12478 * for the child. The child is going to be given those bounds regardless 12479 * of how big it wants to be. 12480 */ 12481 public static final int EXACTLY = 1 << MODE_SHIFT; 12482 12483 /** 12484 * Measure specification mode: The child can be as large as it wants up 12485 * to the specified size. 12486 */ 12487 public static final int AT_MOST = 2 << MODE_SHIFT; 12488 12489 /** 12490 * Creates a measure specification based on the supplied size and mode. 12491 * 12492 * The mode must always be one of the following: 12493 * <ul> 12494 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 12495 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 12496 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 12497 * </ul> 12498 * 12499 * @param size the size of the measure specification 12500 * @param mode the mode of the measure specification 12501 * @return the measure specification based on size and mode 12502 */ 12503 public static int makeMeasureSpec(int size, int mode) { 12504 return size + mode; 12505 } 12506 12507 /** 12508 * Extracts the mode from the supplied measure specification. 12509 * 12510 * @param measureSpec the measure specification to extract the mode from 12511 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 12512 * {@link android.view.View.MeasureSpec#AT_MOST} or 12513 * {@link android.view.View.MeasureSpec#EXACTLY} 12514 */ 12515 public static int getMode(int measureSpec) { 12516 return (measureSpec & MODE_MASK); 12517 } 12518 12519 /** 12520 * Extracts the size from the supplied measure specification. 12521 * 12522 * @param measureSpec the measure specification to extract the size from 12523 * @return the size in pixels defined in the supplied measure specification 12524 */ 12525 public static int getSize(int measureSpec) { 12526 return (measureSpec & ~MODE_MASK); 12527 } 12528 12529 /** 12530 * Returns a String representation of the specified measure 12531 * specification. 12532 * 12533 * @param measureSpec the measure specification to convert to a String 12534 * @return a String with the following format: "MeasureSpec: MODE SIZE" 12535 */ 12536 public static String toString(int measureSpec) { 12537 int mode = getMode(measureSpec); 12538 int size = getSize(measureSpec); 12539 12540 StringBuilder sb = new StringBuilder("MeasureSpec: "); 12541 12542 if (mode == UNSPECIFIED) 12543 sb.append("UNSPECIFIED "); 12544 else if (mode == EXACTLY) 12545 sb.append("EXACTLY "); 12546 else if (mode == AT_MOST) 12547 sb.append("AT_MOST "); 12548 else 12549 sb.append(mode).append(" "); 12550 12551 sb.append(size); 12552 return sb.toString(); 12553 } 12554 } 12555 12556 class CheckForLongPress implements Runnable { 12557 12558 private int mOriginalWindowAttachCount; 12559 12560 public void run() { 12561 if (isPressed() && (mParent != null) 12562 && mOriginalWindowAttachCount == mWindowAttachCount) { 12563 if (performLongClick()) { 12564 mHasPerformedLongPress = true; 12565 } 12566 } 12567 } 12568 12569 public void rememberWindowAttachCount() { 12570 mOriginalWindowAttachCount = mWindowAttachCount; 12571 } 12572 } 12573 12574 private final class CheckForTap implements Runnable { 12575 public void run() { 12576 mPrivateFlags &= ~PREPRESSED; 12577 mPrivateFlags |= PRESSED; 12578 refreshDrawableState(); 12579 checkForLongClick(ViewConfiguration.getTapTimeout()); 12580 } 12581 } 12582 12583 private final class PerformClick implements Runnable { 12584 public void run() { 12585 performClick(); 12586 } 12587 } 12588 12589 /** @hide */ 12590 public void hackTurnOffWindowResizeAnim(boolean off) { 12591 mAttachInfo.mTurnOffWindowResizeAnim = off; 12592 } 12593 12594 /** 12595 * This method returns a ViewPropertyAnimator object, which can be used to animate 12596 * specific properties on this View. 12597 * 12598 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 12599 */ 12600 public ViewPropertyAnimator animate() { 12601 if (mAnimator == null) { 12602 mAnimator = new ViewPropertyAnimator(this); 12603 } 12604 return mAnimator; 12605 } 12606 12607 /** 12608 * Interface definition for a callback to be invoked when a key event is 12609 * dispatched to this view. The callback will be invoked before the key 12610 * event is given to the view. 12611 */ 12612 public interface OnKeyListener { 12613 /** 12614 * Called when a key is dispatched to a view. This allows listeners to 12615 * get a chance to respond before the target view. 12616 * 12617 * @param v The view the key has been dispatched to. 12618 * @param keyCode The code for the physical key that was pressed 12619 * @param event The KeyEvent object containing full information about 12620 * the event. 12621 * @return True if the listener has consumed the event, false otherwise. 12622 */ 12623 boolean onKey(View v, int keyCode, KeyEvent event); 12624 } 12625 12626 /** 12627 * Interface definition for a callback to be invoked when a touch event is 12628 * dispatched to this view. The callback will be invoked before the touch 12629 * event is given to the view. 12630 */ 12631 public interface OnTouchListener { 12632 /** 12633 * Called when a touch event is dispatched to a view. This allows listeners to 12634 * get a chance to respond before the target view. 12635 * 12636 * @param v The view the touch event has been dispatched to. 12637 * @param event The MotionEvent object containing full information about 12638 * the event. 12639 * @return True if the listener has consumed the event, false otherwise. 12640 */ 12641 boolean onTouch(View v, MotionEvent event); 12642 } 12643 12644 /** 12645 * Interface definition for a callback to be invoked when a generic motion event is 12646 * dispatched to this view. The callback will be invoked before the generic motion 12647 * event is given to the view. 12648 */ 12649 public interface OnGenericMotionListener { 12650 /** 12651 * Called when a generic motion event is dispatched to a view. This allows listeners to 12652 * get a chance to respond before the target view. 12653 * 12654 * @param v The view the generic motion event has been dispatched to. 12655 * @param event The MotionEvent object containing full information about 12656 * the event. 12657 * @return True if the listener has consumed the event, false otherwise. 12658 */ 12659 boolean onGenericMotion(View v, MotionEvent event); 12660 } 12661 12662 /** 12663 * Interface definition for a callback to be invoked when a view has been clicked and held. 12664 */ 12665 public interface OnLongClickListener { 12666 /** 12667 * Called when a view has been clicked and held. 12668 * 12669 * @param v The view that was clicked and held. 12670 * 12671 * @return true if the callback consumed the long click, false otherwise. 12672 */ 12673 boolean onLongClick(View v); 12674 } 12675 12676 /** 12677 * Interface definition for a callback to be invoked when a drag is being dispatched 12678 * to this view. The callback will be invoked before the hosting view's own 12679 * onDrag(event) method. If the listener wants to fall back to the hosting view's 12680 * onDrag(event) behavior, it should return 'false' from this callback. 12681 */ 12682 public interface OnDragListener { 12683 /** 12684 * Called when a drag event is dispatched to a view. This allows listeners 12685 * to get a chance to override base View behavior. 12686 * 12687 * @param v The View that received the drag event. 12688 * @param event The {@link android.view.DragEvent} object for the drag event. 12689 * @return {@code true} if the drag event was handled successfully, or {@code false} 12690 * if the drag event was not handled. Note that {@code false} will trigger the View 12691 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 12692 */ 12693 boolean onDrag(View v, DragEvent event); 12694 } 12695 12696 /** 12697 * Interface definition for a callback to be invoked when the focus state of 12698 * a view changed. 12699 */ 12700 public interface OnFocusChangeListener { 12701 /** 12702 * Called when the focus state of a view has changed. 12703 * 12704 * @param v The view whose state has changed. 12705 * @param hasFocus The new focus state of v. 12706 */ 12707 void onFocusChange(View v, boolean hasFocus); 12708 } 12709 12710 /** 12711 * Interface definition for a callback to be invoked when a view is clicked. 12712 */ 12713 public interface OnClickListener { 12714 /** 12715 * Called when a view has been clicked. 12716 * 12717 * @param v The view that was clicked. 12718 */ 12719 void onClick(View v); 12720 } 12721 12722 /** 12723 * Interface definition for a callback to be invoked when the context menu 12724 * for this view is being built. 12725 */ 12726 public interface OnCreateContextMenuListener { 12727 /** 12728 * Called when the context menu for this view is being built. It is not 12729 * safe to hold onto the menu after this method returns. 12730 * 12731 * @param menu The context menu that is being built 12732 * @param v The view for which the context menu is being built 12733 * @param menuInfo Extra information about the item for which the 12734 * context menu should be shown. This information will vary 12735 * depending on the class of v. 12736 */ 12737 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 12738 } 12739 12740 /** 12741 * Interface definition for a callback to be invoked when the status bar changes 12742 * visibility. 12743 * 12744 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 12745 */ 12746 public interface OnSystemUiVisibilityChangeListener { 12747 /** 12748 * Called when the status bar changes visibility because of a call to 12749 * {@link View#setSystemUiVisibility(int)}. 12750 * 12751 * @param visibility {@link #STATUS_BAR_VISIBLE} or {@link #STATUS_BAR_HIDDEN}. 12752 */ 12753 public void onSystemUiVisibilityChange(int visibility); 12754 } 12755 12756 /** 12757 * Interface definition for a callback to be invoked when this view is attached 12758 * or detached from its window. 12759 */ 12760 public interface OnAttachStateChangeListener { 12761 /** 12762 * Called when the view is attached to a window. 12763 * @param v The view that was attached 12764 */ 12765 public void onViewAttachedToWindow(View v); 12766 /** 12767 * Called when the view is detached from a window. 12768 * @param v The view that was detached 12769 */ 12770 public void onViewDetachedFromWindow(View v); 12771 } 12772 12773 private final class UnsetPressedState implements Runnable { 12774 public void run() { 12775 setPressed(false); 12776 } 12777 } 12778 12779 /** 12780 * Base class for derived classes that want to save and restore their own 12781 * state in {@link android.view.View#onSaveInstanceState()}. 12782 */ 12783 public static class BaseSavedState extends AbsSavedState { 12784 /** 12785 * Constructor used when reading from a parcel. Reads the state of the superclass. 12786 * 12787 * @param source 12788 */ 12789 public BaseSavedState(Parcel source) { 12790 super(source); 12791 } 12792 12793 /** 12794 * Constructor called by derived classes when creating their SavedState objects 12795 * 12796 * @param superState The state of the superclass of this view 12797 */ 12798 public BaseSavedState(Parcelable superState) { 12799 super(superState); 12800 } 12801 12802 public static final Parcelable.Creator<BaseSavedState> CREATOR = 12803 new Parcelable.Creator<BaseSavedState>() { 12804 public BaseSavedState createFromParcel(Parcel in) { 12805 return new BaseSavedState(in); 12806 } 12807 12808 public BaseSavedState[] newArray(int size) { 12809 return new BaseSavedState[size]; 12810 } 12811 }; 12812 } 12813 12814 /** 12815 * A set of information given to a view when it is attached to its parent 12816 * window. 12817 */ 12818 static class AttachInfo { 12819 interface Callbacks { 12820 void playSoundEffect(int effectId); 12821 boolean performHapticFeedback(int effectId, boolean always); 12822 } 12823 12824 /** 12825 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 12826 * to a Handler. This class contains the target (View) to invalidate and 12827 * the coordinates of the dirty rectangle. 12828 * 12829 * For performance purposes, this class also implements a pool of up to 12830 * POOL_LIMIT objects that get reused. This reduces memory allocations 12831 * whenever possible. 12832 */ 12833 static class InvalidateInfo implements Poolable<InvalidateInfo> { 12834 private static final int POOL_LIMIT = 10; 12835 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 12836 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 12837 public InvalidateInfo newInstance() { 12838 return new InvalidateInfo(); 12839 } 12840 12841 public void onAcquired(InvalidateInfo element) { 12842 } 12843 12844 public void onReleased(InvalidateInfo element) { 12845 } 12846 }, POOL_LIMIT) 12847 ); 12848 12849 private InvalidateInfo mNext; 12850 private boolean mIsPooled; 12851 12852 View target; 12853 12854 int left; 12855 int top; 12856 int right; 12857 int bottom; 12858 12859 public void setNextPoolable(InvalidateInfo element) { 12860 mNext = element; 12861 } 12862 12863 public InvalidateInfo getNextPoolable() { 12864 return mNext; 12865 } 12866 12867 static InvalidateInfo acquire() { 12868 return sPool.acquire(); 12869 } 12870 12871 void release() { 12872 sPool.release(this); 12873 } 12874 12875 public boolean isPooled() { 12876 return mIsPooled; 12877 } 12878 12879 public void setPooled(boolean isPooled) { 12880 mIsPooled = isPooled; 12881 } 12882 } 12883 12884 final IWindowSession mSession; 12885 12886 final IWindow mWindow; 12887 12888 final IBinder mWindowToken; 12889 12890 final Callbacks mRootCallbacks; 12891 12892 Canvas mHardwareCanvas; 12893 12894 /** 12895 * The top view of the hierarchy. 12896 */ 12897 View mRootView; 12898 12899 IBinder mPanelParentWindowToken; 12900 Surface mSurface; 12901 12902 boolean mHardwareAccelerated; 12903 boolean mHardwareAccelerationRequested; 12904 HardwareRenderer mHardwareRenderer; 12905 12906 /** 12907 * Scale factor used by the compatibility mode 12908 */ 12909 float mApplicationScale; 12910 12911 /** 12912 * Indicates whether the application is in compatibility mode 12913 */ 12914 boolean mScalingRequired; 12915 12916 /** 12917 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 12918 */ 12919 boolean mTurnOffWindowResizeAnim; 12920 12921 /** 12922 * Left position of this view's window 12923 */ 12924 int mWindowLeft; 12925 12926 /** 12927 * Top position of this view's window 12928 */ 12929 int mWindowTop; 12930 12931 /** 12932 * Indicates whether views need to use 32-bit drawing caches 12933 */ 12934 boolean mUse32BitDrawingCache; 12935 12936 /** 12937 * For windows that are full-screen but using insets to layout inside 12938 * of the screen decorations, these are the current insets for the 12939 * content of the window. 12940 */ 12941 final Rect mContentInsets = new Rect(); 12942 12943 /** 12944 * For windows that are full-screen but using insets to layout inside 12945 * of the screen decorations, these are the current insets for the 12946 * actual visible parts of the window. 12947 */ 12948 final Rect mVisibleInsets = new Rect(); 12949 12950 /** 12951 * The internal insets given by this window. This value is 12952 * supplied by the client (through 12953 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 12954 * be given to the window manager when changed to be used in laying 12955 * out windows behind it. 12956 */ 12957 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 12958 = new ViewTreeObserver.InternalInsetsInfo(); 12959 12960 /** 12961 * All views in the window's hierarchy that serve as scroll containers, 12962 * used to determine if the window can be resized or must be panned 12963 * to adjust for a soft input area. 12964 */ 12965 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 12966 12967 final KeyEvent.DispatcherState mKeyDispatchState 12968 = new KeyEvent.DispatcherState(); 12969 12970 /** 12971 * Indicates whether the view's window currently has the focus. 12972 */ 12973 boolean mHasWindowFocus; 12974 12975 /** 12976 * The current visibility of the window. 12977 */ 12978 int mWindowVisibility; 12979 12980 /** 12981 * Indicates the time at which drawing started to occur. 12982 */ 12983 long mDrawingTime; 12984 12985 /** 12986 * Indicates whether or not ignoring the DIRTY_MASK flags. 12987 */ 12988 boolean mIgnoreDirtyState; 12989 12990 /** 12991 * Indicates whether the view's window is currently in touch mode. 12992 */ 12993 boolean mInTouchMode; 12994 12995 /** 12996 * Indicates that ViewAncestor should trigger a global layout change 12997 * the next time it performs a traversal 12998 */ 12999 boolean mRecomputeGlobalAttributes; 13000 13001 /** 13002 * Set during a traveral if any views want to keep the screen on. 13003 */ 13004 boolean mKeepScreenOn; 13005 13006 /** 13007 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 13008 */ 13009 int mSystemUiVisibility; 13010 13011 /** 13012 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 13013 * attached. 13014 */ 13015 boolean mHasSystemUiListeners; 13016 13017 /** 13018 * Set if the visibility of any views has changed. 13019 */ 13020 boolean mViewVisibilityChanged; 13021 13022 /** 13023 * Set to true if a view has been scrolled. 13024 */ 13025 boolean mViewScrollChanged; 13026 13027 /** 13028 * Global to the view hierarchy used as a temporary for dealing with 13029 * x/y points in the transparent region computations. 13030 */ 13031 final int[] mTransparentLocation = new int[2]; 13032 13033 /** 13034 * Global to the view hierarchy used as a temporary for dealing with 13035 * x/y points in the ViewGroup.invalidateChild implementation. 13036 */ 13037 final int[] mInvalidateChildLocation = new int[2]; 13038 13039 13040 /** 13041 * Global to the view hierarchy used as a temporary for dealing with 13042 * x/y location when view is transformed. 13043 */ 13044 final float[] mTmpTransformLocation = new float[2]; 13045 13046 /** 13047 * The view tree observer used to dispatch global events like 13048 * layout, pre-draw, touch mode change, etc. 13049 */ 13050 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 13051 13052 /** 13053 * A Canvas used by the view hierarchy to perform bitmap caching. 13054 */ 13055 Canvas mCanvas; 13056 13057 /** 13058 * A Handler supplied by a view's {@link android.view.ViewAncestor}. This 13059 * handler can be used to pump events in the UI events queue. 13060 */ 13061 final Handler mHandler; 13062 13063 /** 13064 * Identifier for messages requesting the view to be invalidated. 13065 * Such messages should be sent to {@link #mHandler}. 13066 */ 13067 static final int INVALIDATE_MSG = 0x1; 13068 13069 /** 13070 * Identifier for messages requesting the view to invalidate a region. 13071 * Such messages should be sent to {@link #mHandler}. 13072 */ 13073 static final int INVALIDATE_RECT_MSG = 0x2; 13074 13075 /** 13076 * Temporary for use in computing invalidate rectangles while 13077 * calling up the hierarchy. 13078 */ 13079 final Rect mTmpInvalRect = new Rect(); 13080 13081 /** 13082 * Temporary for use in computing hit areas with transformed views 13083 */ 13084 final RectF mTmpTransformRect = new RectF(); 13085 13086 /** 13087 * Temporary list for use in collecting focusable descendents of a view. 13088 */ 13089 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 13090 13091 /** 13092 * The id of the window for accessibility purposes. 13093 */ 13094 int mAccessibilityWindowId = View.NO_ID; 13095 13096 /** 13097 * Creates a new set of attachment information with the specified 13098 * events handler and thread. 13099 * 13100 * @param handler the events handler the view must use 13101 */ 13102 AttachInfo(IWindowSession session, IWindow window, 13103 Handler handler, Callbacks effectPlayer) { 13104 mSession = session; 13105 mWindow = window; 13106 mWindowToken = window.asBinder(); 13107 mHandler = handler; 13108 mRootCallbacks = effectPlayer; 13109 } 13110 } 13111 13112 /** 13113 * <p>ScrollabilityCache holds various fields used by a View when scrolling 13114 * is supported. This avoids keeping too many unused fields in most 13115 * instances of View.</p> 13116 */ 13117 private static class ScrollabilityCache implements Runnable { 13118 13119 /** 13120 * Scrollbars are not visible 13121 */ 13122 public static final int OFF = 0; 13123 13124 /** 13125 * Scrollbars are visible 13126 */ 13127 public static final int ON = 1; 13128 13129 /** 13130 * Scrollbars are fading away 13131 */ 13132 public static final int FADING = 2; 13133 13134 public boolean fadeScrollBars; 13135 13136 public int fadingEdgeLength; 13137 public int scrollBarDefaultDelayBeforeFade; 13138 public int scrollBarFadeDuration; 13139 13140 public int scrollBarSize; 13141 public ScrollBarDrawable scrollBar; 13142 public float[] interpolatorValues; 13143 public View host; 13144 13145 public final Paint paint; 13146 public final Matrix matrix; 13147 public Shader shader; 13148 13149 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 13150 13151 private static final float[] OPAQUE = { 255 }; 13152 private static final float[] TRANSPARENT = { 0.0f }; 13153 13154 /** 13155 * When fading should start. This time moves into the future every time 13156 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 13157 */ 13158 public long fadeStartTime; 13159 13160 13161 /** 13162 * The current state of the scrollbars: ON, OFF, or FADING 13163 */ 13164 public int state = OFF; 13165 13166 private int mLastColor; 13167 13168 public ScrollabilityCache(ViewConfiguration configuration, View host) { 13169 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 13170 scrollBarSize = configuration.getScaledScrollBarSize(); 13171 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 13172 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 13173 13174 paint = new Paint(); 13175 matrix = new Matrix(); 13176 // use use a height of 1, and then wack the matrix each time we 13177 // actually use it. 13178 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 13179 13180 paint.setShader(shader); 13181 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 13182 this.host = host; 13183 } 13184 13185 public void setFadeColor(int color) { 13186 if (color != 0 && color != mLastColor) { 13187 mLastColor = color; 13188 color |= 0xFF000000; 13189 13190 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 13191 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 13192 13193 paint.setShader(shader); 13194 // Restore the default transfer mode (src_over) 13195 paint.setXfermode(null); 13196 } 13197 } 13198 13199 public void run() { 13200 long now = AnimationUtils.currentAnimationTimeMillis(); 13201 if (now >= fadeStartTime) { 13202 13203 // the animation fades the scrollbars out by changing 13204 // the opacity (alpha) from fully opaque to fully 13205 // transparent 13206 int nextFrame = (int) now; 13207 int framesCount = 0; 13208 13209 Interpolator interpolator = scrollBarInterpolator; 13210 13211 // Start opaque 13212 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 13213 13214 // End transparent 13215 nextFrame += scrollBarFadeDuration; 13216 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 13217 13218 state = FADING; 13219 13220 // Kick off the fade animation 13221 host.invalidate(true); 13222 } 13223 } 13224 13225 } 13226} 13227