View.java revision c529d8d8c709aed9c9e6d87af3ce2eb4c73da4bf
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Interpolator; 28import android.graphics.LinearGradient; 29import android.graphics.Matrix; 30import android.graphics.Paint; 31import android.graphics.PixelFormat; 32import android.graphics.Point; 33import android.graphics.PorterDuff; 34import android.graphics.PorterDuffXfermode; 35import android.graphics.Rect; 36import android.graphics.RectF; 37import android.graphics.Region; 38import android.graphics.Shader; 39import android.graphics.drawable.ColorDrawable; 40import android.graphics.drawable.Drawable; 41import android.os.Handler; 42import android.os.IBinder; 43import android.os.Message; 44import android.os.Parcel; 45import android.os.Parcelable; 46import android.os.RemoteException; 47import android.os.SystemClock; 48import android.util.AttributeSet; 49import android.util.FloatProperty; 50import android.util.LocaleUtil; 51import android.util.Log; 52import android.util.Pool; 53import android.util.Poolable; 54import android.util.PoolableManager; 55import android.util.Pools; 56import android.util.Property; 57import android.util.SparseArray; 58import android.util.TypedValue; 59import android.view.ContextMenu.ContextMenuInfo; 60import android.view.accessibility.AccessibilityEvent; 61import android.view.accessibility.AccessibilityEventSource; 62import android.view.accessibility.AccessibilityManager; 63import android.view.accessibility.AccessibilityNodeInfo; 64import android.view.animation.Animation; 65import android.view.animation.AnimationUtils; 66import android.view.inputmethod.EditorInfo; 67import android.view.inputmethod.InputConnection; 68import android.view.inputmethod.InputMethodManager; 69import android.widget.ScrollBarDrawable; 70 71import com.android.internal.R; 72import com.android.internal.util.Predicate; 73import com.android.internal.view.menu.MenuBuilder; 74 75import java.lang.ref.WeakReference; 76import java.lang.reflect.InvocationTargetException; 77import java.lang.reflect.Method; 78import java.util.ArrayList; 79import java.util.Arrays; 80import java.util.Locale; 81import java.util.WeakHashMap; 82import java.util.concurrent.CopyOnWriteArrayList; 83 84/** 85 * <p> 86 * This class represents the basic building block for user interface components. A View 87 * occupies a rectangular area on the screen and is responsible for drawing and 88 * event handling. View is the base class for <em>widgets</em>, which are 89 * used to create interactive UI components (buttons, text fields, etc.). The 90 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 91 * are invisible containers that hold other Views (or other ViewGroups) and define 92 * their layout properties. 93 * </p> 94 * 95 * <div class="special"> 96 * <p>For an introduction to using this class to develop your 97 * application's user interface, read the Developer Guide documentation on 98 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 99 * include: 100 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 103 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 104 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 105 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 106 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 107 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 108 * </p> 109 * </div> 110 * 111 * <a name="Using"></a> 112 * <h3>Using Views</h3> 113 * <p> 114 * All of the views in a window are arranged in a single tree. You can add views 115 * either from code or by specifying a tree of views in one or more XML layout 116 * files. There are many specialized subclasses of views that act as controls or 117 * are capable of displaying text, images, or other content. 118 * </p> 119 * <p> 120 * Once you have created a tree of views, there are typically a few types of 121 * common operations you may wish to perform: 122 * <ul> 123 * <li><strong>Set properties:</strong> for example setting the text of a 124 * {@link android.widget.TextView}. The available properties and the methods 125 * that set them will vary among the different subclasses of views. Note that 126 * properties that are known at build time can be set in the XML layout 127 * files.</li> 128 * <li><strong>Set focus:</strong> The framework will handled moving focus in 129 * response to user input. To force focus to a specific view, call 130 * {@link #requestFocus}.</li> 131 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 132 * that will be notified when something interesting happens to the view. For 133 * example, all views will let you set a listener to be notified when the view 134 * gains or loses focus. You can register such a listener using 135 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 136 * Other view subclasses offer more specialized listeners. For example, a Button 137 * exposes a listener to notify clients when the button is clicked.</li> 138 * <li><strong>Set visibility:</strong> You can hide or show views using 139 * {@link #setVisibility(int)}.</li> 140 * </ul> 141 * </p> 142 * <p><em> 143 * Note: The Android framework is responsible for measuring, laying out and 144 * drawing views. You should not call methods that perform these actions on 145 * views yourself unless you are actually implementing a 146 * {@link android.view.ViewGroup}. 147 * </em></p> 148 * 149 * <a name="Lifecycle"></a> 150 * <h3>Implementing a Custom View</h3> 151 * 152 * <p> 153 * To implement a custom view, you will usually begin by providing overrides for 154 * some of the standard methods that the framework calls on all views. You do 155 * not need to override all of these methods. In fact, you can start by just 156 * overriding {@link #onDraw(android.graphics.Canvas)}. 157 * <table border="2" width="85%" align="center" cellpadding="5"> 158 * <thead> 159 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 160 * </thead> 161 * 162 * <tbody> 163 * <tr> 164 * <td rowspan="2">Creation</td> 165 * <td>Constructors</td> 166 * <td>There is a form of the constructor that are called when the view 167 * is created from code and a form that is called when the view is 168 * inflated from a layout file. The second form should parse and apply 169 * any attributes defined in the layout file. 170 * </td> 171 * </tr> 172 * <tr> 173 * <td><code>{@link #onFinishInflate()}</code></td> 174 * <td>Called after a view and all of its children has been inflated 175 * from XML.</td> 176 * </tr> 177 * 178 * <tr> 179 * <td rowspan="3">Layout</td> 180 * <td><code>{@link #onMeasure(int, int)}</code></td> 181 * <td>Called to determine the size requirements for this view and all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 187 * <td>Called when this view should assign a size and position to all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 193 * <td>Called when the size of this view has changed. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td>Drawing</td> 199 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 200 * <td>Called when the view should render its content. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td rowspan="4">Event processing</td> 206 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 207 * <td>Called when a new key event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 212 * <td>Called when a key up event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 217 * <td>Called when a trackball motion event occurs. 218 * </td> 219 * </tr> 220 * <tr> 221 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 222 * <td>Called when a touch screen motion event occurs. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td rowspan="2">Focus</td> 228 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 229 * <td>Called when the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 235 * <td>Called when the window containing the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td rowspan="3">Attaching</td> 241 * <td><code>{@link #onAttachedToWindow()}</code></td> 242 * <td>Called when the view is attached to a window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onDetachedFromWindow}</code></td> 248 * <td>Called when the view is detached from its window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 254 * <td>Called when the visibility of the window containing the view 255 * has changed. 256 * </td> 257 * </tr> 258 * </tbody> 259 * 260 * </table> 261 * </p> 262 * 263 * <a name="IDs"></a> 264 * <h3>IDs</h3> 265 * Views may have an integer id associated with them. These ids are typically 266 * assigned in the layout XML files, and are used to find specific views within 267 * the view tree. A common pattern is to: 268 * <ul> 269 * <li>Define a Button in the layout file and assign it a unique ID. 270 * <pre> 271 * <Button 272 * android:id="@+id/my_button" 273 * android:layout_width="wrap_content" 274 * android:layout_height="wrap_content" 275 * android:text="@string/my_button_text"/> 276 * </pre></li> 277 * <li>From the onCreate method of an Activity, find the Button 278 * <pre class="prettyprint"> 279 * Button myButton = (Button) findViewById(R.id.my_button); 280 * </pre></li> 281 * </ul> 282 * <p> 283 * View IDs need not be unique throughout the tree, but it is good practice to 284 * ensure that they are at least unique within the part of the tree you are 285 * searching. 286 * </p> 287 * 288 * <a name="Position"></a> 289 * <h3>Position</h3> 290 * <p> 291 * The geometry of a view is that of a rectangle. A view has a location, 292 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 293 * two dimensions, expressed as a width and a height. The unit for location 294 * and dimensions is the pixel. 295 * </p> 296 * 297 * <p> 298 * It is possible to retrieve the location of a view by invoking the methods 299 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 300 * coordinate of the rectangle representing the view. The latter returns the 301 * top, or Y, coordinate of the rectangle representing the view. These methods 302 * both return the location of the view relative to its parent. For instance, 303 * when getLeft() returns 20, that means the view is located 20 pixels to the 304 * right of the left edge of its direct parent. 305 * </p> 306 * 307 * <p> 308 * In addition, several convenience methods are offered to avoid unnecessary 309 * computations, namely {@link #getRight()} and {@link #getBottom()}. 310 * These methods return the coordinates of the right and bottom edges of the 311 * rectangle representing the view. For instance, calling {@link #getRight()} 312 * is similar to the following computation: <code>getLeft() + getWidth()</code> 313 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 314 * </p> 315 * 316 * <a name="SizePaddingMargins"></a> 317 * <h3>Size, padding and margins</h3> 318 * <p> 319 * The size of a view is expressed with a width and a height. A view actually 320 * possess two pairs of width and height values. 321 * </p> 322 * 323 * <p> 324 * The first pair is known as <em>measured width</em> and 325 * <em>measured height</em>. These dimensions define how big a view wants to be 326 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 327 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 328 * and {@link #getMeasuredHeight()}. 329 * </p> 330 * 331 * <p> 332 * The second pair is simply known as <em>width</em> and <em>height</em>, or 333 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 334 * dimensions define the actual size of the view on screen, at drawing time and 335 * after layout. These values may, but do not have to, be different from the 336 * measured width and height. The width and height can be obtained by calling 337 * {@link #getWidth()} and {@link #getHeight()}. 338 * </p> 339 * 340 * <p> 341 * To measure its dimensions, a view takes into account its padding. The padding 342 * is expressed in pixels for the left, top, right and bottom parts of the view. 343 * Padding can be used to offset the content of the view by a specific amount of 344 * pixels. For instance, a left padding of 2 will push the view's content by 345 * 2 pixels to the right of the left edge. Padding can be set using the 346 * {@link #setPadding(int, int, int, int)} method and queried by calling 347 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 348 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}. 349 * </p> 350 * 351 * <p> 352 * Even though a view can define a padding, it does not provide any support for 353 * margins. However, view groups provide such a support. Refer to 354 * {@link android.view.ViewGroup} and 355 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 356 * </p> 357 * 358 * <a name="Layout"></a> 359 * <h3>Layout</h3> 360 * <p> 361 * Layout is a two pass process: a measure pass and a layout pass. The measuring 362 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 363 * of the view tree. Each view pushes dimension specifications down the tree 364 * during the recursion. At the end of the measure pass, every view has stored 365 * its measurements. The second pass happens in 366 * {@link #layout(int,int,int,int)} and is also top-down. During 367 * this pass each parent is responsible for positioning all of its children 368 * using the sizes computed in the measure pass. 369 * </p> 370 * 371 * <p> 372 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 373 * {@link #getMeasuredHeight()} values must be set, along with those for all of 374 * that view's descendants. A view's measured width and measured height values 375 * must respect the constraints imposed by the view's parents. This guarantees 376 * that at the end of the measure pass, all parents accept all of their 377 * children's measurements. A parent view may call measure() more than once on 378 * its children. For example, the parent may measure each child once with 379 * unspecified dimensions to find out how big they want to be, then call 380 * measure() on them again with actual numbers if the sum of all the children's 381 * unconstrained sizes is too big or too small. 382 * </p> 383 * 384 * <p> 385 * The measure pass uses two classes to communicate dimensions. The 386 * {@link MeasureSpec} class is used by views to tell their parents how they 387 * want to be measured and positioned. The base LayoutParams class just 388 * describes how big the view wants to be for both width and height. For each 389 * dimension, it can specify one of: 390 * <ul> 391 * <li> an exact number 392 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 393 * (minus padding) 394 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 395 * enclose its content (plus padding). 396 * </ul> 397 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 398 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 399 * an X and Y value. 400 * </p> 401 * 402 * <p> 403 * MeasureSpecs are used to push requirements down the tree from parent to 404 * child. A MeasureSpec can be in one of three modes: 405 * <ul> 406 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 407 * of a child view. For example, a LinearLayout may call measure() on its child 408 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 409 * tall the child view wants to be given a width of 240 pixels. 410 * <li>EXACTLY: This is used by the parent to impose an exact size on the 411 * child. The child must use this size, and guarantee that all of its 412 * descendants will fit within this size. 413 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 414 * child. The child must gurantee that it and all of its descendants will fit 415 * within this size. 416 * </ul> 417 * </p> 418 * 419 * <p> 420 * To intiate a layout, call {@link #requestLayout}. This method is typically 421 * called by a view on itself when it believes that is can no longer fit within 422 * its current bounds. 423 * </p> 424 * 425 * <a name="Drawing"></a> 426 * <h3>Drawing</h3> 427 * <p> 428 * Drawing is handled by walking the tree and rendering each view that 429 * intersects the the invalid region. Because the tree is traversed in-order, 430 * this means that parents will draw before (i.e., behind) their children, with 431 * siblings drawn in the order they appear in the tree. 432 * If you set a background drawable for a View, then the View will draw it for you 433 * before calling back to its <code>onDraw()</code> method. 434 * </p> 435 * 436 * <p> 437 * Note that the framework will not draw views that are not in the invalid region. 438 * </p> 439 * 440 * <p> 441 * To force a view to draw, call {@link #invalidate()}. 442 * </p> 443 * 444 * <a name="EventHandlingThreading"></a> 445 * <h3>Event Handling and Threading</h3> 446 * <p> 447 * The basic cycle of a view is as follows: 448 * <ol> 449 * <li>An event comes in and is dispatched to the appropriate view. The view 450 * handles the event and notifies any listeners.</li> 451 * <li>If in the course of processing the event, the view's bounds may need 452 * to be changed, the view will call {@link #requestLayout()}.</li> 453 * <li>Similarly, if in the course of processing the event the view's appearance 454 * may need to be changed, the view will call {@link #invalidate()}.</li> 455 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 456 * the framework will take care of measuring, laying out, and drawing the tree 457 * as appropriate.</li> 458 * </ol> 459 * </p> 460 * 461 * <p><em>Note: The entire view tree is single threaded. You must always be on 462 * the UI thread when calling any method on any view.</em> 463 * If you are doing work on other threads and want to update the state of a view 464 * from that thread, you should use a {@link Handler}. 465 * </p> 466 * 467 * <a name="FocusHandling"></a> 468 * <h3>Focus Handling</h3> 469 * <p> 470 * The framework will handle routine focus movement in response to user input. 471 * This includes changing the focus as views are removed or hidden, or as new 472 * views become available. Views indicate their willingness to take focus 473 * through the {@link #isFocusable} method. To change whether a view can take 474 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 475 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 476 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 477 * </p> 478 * <p> 479 * Focus movement is based on an algorithm which finds the nearest neighbor in a 480 * given direction. In rare cases, the default algorithm may not match the 481 * intended behavior of the developer. In these situations, you can provide 482 * explicit overrides by using these XML attributes in the layout file: 483 * <pre> 484 * nextFocusDown 485 * nextFocusLeft 486 * nextFocusRight 487 * nextFocusUp 488 * </pre> 489 * </p> 490 * 491 * 492 * <p> 493 * To get a particular view to take focus, call {@link #requestFocus()}. 494 * </p> 495 * 496 * <a name="TouchMode"></a> 497 * <h3>Touch Mode</h3> 498 * <p> 499 * When a user is navigating a user interface via directional keys such as a D-pad, it is 500 * necessary to give focus to actionable items such as buttons so the user can see 501 * what will take input. If the device has touch capabilities, however, and the user 502 * begins interacting with the interface by touching it, it is no longer necessary to 503 * always highlight, or give focus to, a particular view. This motivates a mode 504 * for interaction named 'touch mode'. 505 * </p> 506 * <p> 507 * For a touch capable device, once the user touches the screen, the device 508 * will enter touch mode. From this point onward, only views for which 509 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 510 * Other views that are touchable, like buttons, will not take focus when touched; they will 511 * only fire the on click listeners. 512 * </p> 513 * <p> 514 * Any time a user hits a directional key, such as a D-pad direction, the view device will 515 * exit touch mode, and find a view to take focus, so that the user may resume interacting 516 * with the user interface without touching the screen again. 517 * </p> 518 * <p> 519 * The touch mode state is maintained across {@link android.app.Activity}s. Call 520 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 521 * </p> 522 * 523 * <a name="Scrolling"></a> 524 * <h3>Scrolling</h3> 525 * <p> 526 * The framework provides basic support for views that wish to internally 527 * scroll their content. This includes keeping track of the X and Y scroll 528 * offset as well as mechanisms for drawing scrollbars. See 529 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 530 * {@link #awakenScrollBars()} for more details. 531 * </p> 532 * 533 * <a name="Tags"></a> 534 * <h3>Tags</h3> 535 * <p> 536 * Unlike IDs, tags are not used to identify views. Tags are essentially an 537 * extra piece of information that can be associated with a view. They are most 538 * often used as a convenience to store data related to views in the views 539 * themselves rather than by putting them in a separate structure. 540 * </p> 541 * 542 * <a name="Animation"></a> 543 * <h3>Animation</h3> 544 * <p> 545 * You can attach an {@link Animation} object to a view using 546 * {@link #setAnimation(Animation)} or 547 * {@link #startAnimation(Animation)}. The animation can alter the scale, 548 * rotation, translation and alpha of a view over time. If the animation is 549 * attached to a view that has children, the animation will affect the entire 550 * subtree rooted by that node. When an animation is started, the framework will 551 * take care of redrawing the appropriate views until the animation completes. 552 * </p> 553 * <p> 554 * Starting with Android 3.0, the preferred way of animating views is to use the 555 * {@link android.animation} package APIs. 556 * </p> 557 * 558 * <a name="Security"></a> 559 * <h3>Security</h3> 560 * <p> 561 * Sometimes it is essential that an application be able to verify that an action 562 * is being performed with the full knowledge and consent of the user, such as 563 * granting a permission request, making a purchase or clicking on an advertisement. 564 * Unfortunately, a malicious application could try to spoof the user into 565 * performing these actions, unaware, by concealing the intended purpose of the view. 566 * As a remedy, the framework offers a touch filtering mechanism that can be used to 567 * improve the security of views that provide access to sensitive functionality. 568 * </p><p> 569 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 570 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 571 * will discard touches that are received whenever the view's window is obscured by 572 * another visible window. As a result, the view will not receive touches whenever a 573 * toast, dialog or other window appears above the view's window. 574 * </p><p> 575 * For more fine-grained control over security, consider overriding the 576 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 577 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 578 * </p> 579 * 580 * @attr ref android.R.styleable#View_alpha 581 * @attr ref android.R.styleable#View_background 582 * @attr ref android.R.styleable#View_clickable 583 * @attr ref android.R.styleable#View_contentDescription 584 * @attr ref android.R.styleable#View_drawingCacheQuality 585 * @attr ref android.R.styleable#View_duplicateParentState 586 * @attr ref android.R.styleable#View_id 587 * @attr ref android.R.styleable#View_fadingEdge 588 * @attr ref android.R.styleable#View_fadingEdgeLength 589 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 590 * @attr ref android.R.styleable#View_fitsSystemWindows 591 * @attr ref android.R.styleable#View_isScrollContainer 592 * @attr ref android.R.styleable#View_focusable 593 * @attr ref android.R.styleable#View_focusableInTouchMode 594 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 595 * @attr ref android.R.styleable#View_keepScreenOn 596 * @attr ref android.R.styleable#View_layerType 597 * @attr ref android.R.styleable#View_longClickable 598 * @attr ref android.R.styleable#View_minHeight 599 * @attr ref android.R.styleable#View_minWidth 600 * @attr ref android.R.styleable#View_nextFocusDown 601 * @attr ref android.R.styleable#View_nextFocusLeft 602 * @attr ref android.R.styleable#View_nextFocusRight 603 * @attr ref android.R.styleable#View_nextFocusUp 604 * @attr ref android.R.styleable#View_onClick 605 * @attr ref android.R.styleable#View_padding 606 * @attr ref android.R.styleable#View_paddingBottom 607 * @attr ref android.R.styleable#View_paddingLeft 608 * @attr ref android.R.styleable#View_paddingRight 609 * @attr ref android.R.styleable#View_paddingTop 610 * @attr ref android.R.styleable#View_saveEnabled 611 * @attr ref android.R.styleable#View_rotation 612 * @attr ref android.R.styleable#View_rotationX 613 * @attr ref android.R.styleable#View_rotationY 614 * @attr ref android.R.styleable#View_scaleX 615 * @attr ref android.R.styleable#View_scaleY 616 * @attr ref android.R.styleable#View_scrollX 617 * @attr ref android.R.styleable#View_scrollY 618 * @attr ref android.R.styleable#View_scrollbarSize 619 * @attr ref android.R.styleable#View_scrollbarStyle 620 * @attr ref android.R.styleable#View_scrollbars 621 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 622 * @attr ref android.R.styleable#View_scrollbarFadeDuration 623 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 624 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 625 * @attr ref android.R.styleable#View_scrollbarThumbVertical 626 * @attr ref android.R.styleable#View_scrollbarTrackVertical 627 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 628 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 629 * @attr ref android.R.styleable#View_soundEffectsEnabled 630 * @attr ref android.R.styleable#View_tag 631 * @attr ref android.R.styleable#View_transformPivotX 632 * @attr ref android.R.styleable#View_transformPivotY 633 * @attr ref android.R.styleable#View_translationX 634 * @attr ref android.R.styleable#View_translationY 635 * @attr ref android.R.styleable#View_visibility 636 * 637 * @see android.view.ViewGroup 638 */ 639public class View implements Drawable.Callback2, KeyEvent.Callback, AccessibilityEventSource { 640 private static final boolean DBG = false; 641 642 /** 643 * The logging tag used by this class with android.util.Log. 644 */ 645 protected static final String VIEW_LOG_TAG = "View"; 646 647 /** 648 * Used to mark a View that has no ID. 649 */ 650 public static final int NO_ID = -1; 651 652 /** 653 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 654 * calling setFlags. 655 */ 656 private static final int NOT_FOCUSABLE = 0x00000000; 657 658 /** 659 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 660 * setFlags. 661 */ 662 private static final int FOCUSABLE = 0x00000001; 663 664 /** 665 * Mask for use with setFlags indicating bits used for focus. 666 */ 667 private static final int FOCUSABLE_MASK = 0x00000001; 668 669 /** 670 * This view will adjust its padding to fit sytem windows (e.g. status bar) 671 */ 672 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 673 674 /** 675 * This view is visible. 676 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 677 * android:visibility}. 678 */ 679 public static final int VISIBLE = 0x00000000; 680 681 /** 682 * This view is invisible, but it still takes up space for layout purposes. 683 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 684 * android:visibility}. 685 */ 686 public static final int INVISIBLE = 0x00000004; 687 688 /** 689 * This view is invisible, and it doesn't take any space for layout 690 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 691 * android:visibility}. 692 */ 693 public static final int GONE = 0x00000008; 694 695 /** 696 * Mask for use with setFlags indicating bits used for visibility. 697 * {@hide} 698 */ 699 static final int VISIBILITY_MASK = 0x0000000C; 700 701 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 702 703 /** 704 * This view is enabled. Intrepretation varies by subclass. 705 * Use with ENABLED_MASK when calling setFlags. 706 * {@hide} 707 */ 708 static final int ENABLED = 0x00000000; 709 710 /** 711 * This view is disabled. Intrepretation varies by subclass. 712 * Use with ENABLED_MASK when calling setFlags. 713 * {@hide} 714 */ 715 static final int DISABLED = 0x00000020; 716 717 /** 718 * Mask for use with setFlags indicating bits used for indicating whether 719 * this view is enabled 720 * {@hide} 721 */ 722 static final int ENABLED_MASK = 0x00000020; 723 724 /** 725 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 726 * called and further optimizations will be performed. It is okay to have 727 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 728 * {@hide} 729 */ 730 static final int WILL_NOT_DRAW = 0x00000080; 731 732 /** 733 * Mask for use with setFlags indicating bits used for indicating whether 734 * this view is will draw 735 * {@hide} 736 */ 737 static final int DRAW_MASK = 0x00000080; 738 739 /** 740 * <p>This view doesn't show scrollbars.</p> 741 * {@hide} 742 */ 743 static final int SCROLLBARS_NONE = 0x00000000; 744 745 /** 746 * <p>This view shows horizontal scrollbars.</p> 747 * {@hide} 748 */ 749 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 750 751 /** 752 * <p>This view shows vertical scrollbars.</p> 753 * {@hide} 754 */ 755 static final int SCROLLBARS_VERTICAL = 0x00000200; 756 757 /** 758 * <p>Mask for use with setFlags indicating bits used for indicating which 759 * scrollbars are enabled.</p> 760 * {@hide} 761 */ 762 static final int SCROLLBARS_MASK = 0x00000300; 763 764 /** 765 * Indicates that the view should filter touches when its window is obscured. 766 * Refer to the class comments for more information about this security feature. 767 * {@hide} 768 */ 769 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 770 771 // note flag value 0x00000800 is now available for next flags... 772 773 /** 774 * <p>This view doesn't show fading edges.</p> 775 * {@hide} 776 */ 777 static final int FADING_EDGE_NONE = 0x00000000; 778 779 /** 780 * <p>This view shows horizontal fading edges.</p> 781 * {@hide} 782 */ 783 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 784 785 /** 786 * <p>This view shows vertical fading edges.</p> 787 * {@hide} 788 */ 789 static final int FADING_EDGE_VERTICAL = 0x00002000; 790 791 /** 792 * <p>Mask for use with setFlags indicating bits used for indicating which 793 * fading edges are enabled.</p> 794 * {@hide} 795 */ 796 static final int FADING_EDGE_MASK = 0x00003000; 797 798 /** 799 * <p>Indicates this view can be clicked. When clickable, a View reacts 800 * to clicks by notifying the OnClickListener.<p> 801 * {@hide} 802 */ 803 static final int CLICKABLE = 0x00004000; 804 805 /** 806 * <p>Indicates this view is caching its drawing into a bitmap.</p> 807 * {@hide} 808 */ 809 static final int DRAWING_CACHE_ENABLED = 0x00008000; 810 811 /** 812 * <p>Indicates that no icicle should be saved for this view.<p> 813 * {@hide} 814 */ 815 static final int SAVE_DISABLED = 0x000010000; 816 817 /** 818 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 819 * property.</p> 820 * {@hide} 821 */ 822 static final int SAVE_DISABLED_MASK = 0x000010000; 823 824 /** 825 * <p>Indicates that no drawing cache should ever be created for this view.<p> 826 * {@hide} 827 */ 828 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 829 830 /** 831 * <p>Indicates this view can take / keep focus when int touch mode.</p> 832 * {@hide} 833 */ 834 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 835 836 /** 837 * <p>Enables low quality mode for the drawing cache.</p> 838 */ 839 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 840 841 /** 842 * <p>Enables high quality mode for the drawing cache.</p> 843 */ 844 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 845 846 /** 847 * <p>Enables automatic quality mode for the drawing cache.</p> 848 */ 849 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 850 851 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 852 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 853 }; 854 855 /** 856 * <p>Mask for use with setFlags indicating bits used for the cache 857 * quality property.</p> 858 * {@hide} 859 */ 860 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 861 862 /** 863 * <p> 864 * Indicates this view can be long clicked. When long clickable, a View 865 * reacts to long clicks by notifying the OnLongClickListener or showing a 866 * context menu. 867 * </p> 868 * {@hide} 869 */ 870 static final int LONG_CLICKABLE = 0x00200000; 871 872 /** 873 * <p>Indicates that this view gets its drawable states from its direct parent 874 * and ignores its original internal states.</p> 875 * 876 * @hide 877 */ 878 static final int DUPLICATE_PARENT_STATE = 0x00400000; 879 880 /** 881 * The scrollbar style to display the scrollbars inside the content area, 882 * without increasing the padding. The scrollbars will be overlaid with 883 * translucency on the view's content. 884 */ 885 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 886 887 /** 888 * The scrollbar style to display the scrollbars inside the padded area, 889 * increasing the padding of the view. The scrollbars will not overlap the 890 * content area of the view. 891 */ 892 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 893 894 /** 895 * The scrollbar style to display the scrollbars at the edge of the view, 896 * without increasing the padding. The scrollbars will be overlaid with 897 * translucency. 898 */ 899 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 900 901 /** 902 * The scrollbar style to display the scrollbars at the edge of the view, 903 * increasing the padding of the view. The scrollbars will only overlap the 904 * background, if any. 905 */ 906 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 907 908 /** 909 * Mask to check if the scrollbar style is overlay or inset. 910 * {@hide} 911 */ 912 static final int SCROLLBARS_INSET_MASK = 0x01000000; 913 914 /** 915 * Mask to check if the scrollbar style is inside or outside. 916 * {@hide} 917 */ 918 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 919 920 /** 921 * Mask for scrollbar style. 922 * {@hide} 923 */ 924 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 925 926 /** 927 * View flag indicating that the screen should remain on while the 928 * window containing this view is visible to the user. This effectively 929 * takes care of automatically setting the WindowManager's 930 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 931 */ 932 public static final int KEEP_SCREEN_ON = 0x04000000; 933 934 /** 935 * View flag indicating whether this view should have sound effects enabled 936 * for events such as clicking and touching. 937 */ 938 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 939 940 /** 941 * View flag indicating whether this view should have haptic feedback 942 * enabled for events such as long presses. 943 */ 944 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 945 946 /** 947 * <p>Indicates that the view hierarchy should stop saving state when 948 * it reaches this view. If state saving is initiated immediately at 949 * the view, it will be allowed. 950 * {@hide} 951 */ 952 static final int PARENT_SAVE_DISABLED = 0x20000000; 953 954 /** 955 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 956 * {@hide} 957 */ 958 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 959 960 /** 961 * Horizontal direction of this view is from Left to Right. 962 * Use with {@link #setLayoutDirection}. 963 * {@hide} 964 */ 965 public static final int LAYOUT_DIRECTION_LTR = 0x00000000; 966 967 /** 968 * Horizontal direction of this view is from Right to Left. 969 * Use with {@link #setLayoutDirection}. 970 * {@hide} 971 */ 972 public static final int LAYOUT_DIRECTION_RTL = 0x40000000; 973 974 /** 975 * Horizontal direction of this view is inherited from its parent. 976 * Use with {@link #setLayoutDirection}. 977 * {@hide} 978 */ 979 public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000; 980 981 /** 982 * Horizontal direction of this view is from deduced from the default language 983 * script for the locale. Use with {@link #setLayoutDirection}. 984 * {@hide} 985 */ 986 public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000; 987 988 /** 989 * Mask for use with setFlags indicating bits used for horizontalDirection. 990 * {@hide} 991 */ 992 static final int LAYOUT_DIRECTION_MASK = 0xC0000000; 993 994 /* 995 * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct 996 * flag value. 997 * {@hide} 998 */ 999 private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR, 1000 LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE}; 1001 1002 /** 1003 * Default horizontalDirection. 1004 * {@hide} 1005 */ 1006 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1007 1008 /** 1009 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1010 * should add all focusable Views regardless if they are focusable in touch mode. 1011 */ 1012 public static final int FOCUSABLES_ALL = 0x00000000; 1013 1014 /** 1015 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1016 * should add only Views focusable in touch mode. 1017 */ 1018 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1019 1020 /** 1021 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1022 * item. 1023 */ 1024 public static final int FOCUS_BACKWARD = 0x00000001; 1025 1026 /** 1027 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1028 * item. 1029 */ 1030 public static final int FOCUS_FORWARD = 0x00000002; 1031 1032 /** 1033 * Use with {@link #focusSearch(int)}. Move focus to the left. 1034 */ 1035 public static final int FOCUS_LEFT = 0x00000011; 1036 1037 /** 1038 * Use with {@link #focusSearch(int)}. Move focus up. 1039 */ 1040 public static final int FOCUS_UP = 0x00000021; 1041 1042 /** 1043 * Use with {@link #focusSearch(int)}. Move focus to the right. 1044 */ 1045 public static final int FOCUS_RIGHT = 0x00000042; 1046 1047 /** 1048 * Use with {@link #focusSearch(int)}. Move focus down. 1049 */ 1050 public static final int FOCUS_DOWN = 0x00000082; 1051 1052 /** 1053 * Bits of {@link #getMeasuredWidthAndState()} and 1054 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1055 */ 1056 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1057 1058 /** 1059 * Bits of {@link #getMeasuredWidthAndState()} and 1060 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1061 */ 1062 public static final int MEASURED_STATE_MASK = 0xff000000; 1063 1064 /** 1065 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1066 * for functions that combine both width and height into a single int, 1067 * such as {@link #getMeasuredState()} and the childState argument of 1068 * {@link #resolveSizeAndState(int, int, int)}. 1069 */ 1070 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1071 1072 /** 1073 * Bit of {@link #getMeasuredWidthAndState()} and 1074 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1075 * is smaller that the space the view would like to have. 1076 */ 1077 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1078 1079 /** 1080 * Base View state sets 1081 */ 1082 // Singles 1083 /** 1084 * Indicates the view has no states set. States are used with 1085 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1086 * view depending on its state. 1087 * 1088 * @see android.graphics.drawable.Drawable 1089 * @see #getDrawableState() 1090 */ 1091 protected static final int[] EMPTY_STATE_SET; 1092 /** 1093 * Indicates the view is enabled. States are used with 1094 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1095 * view depending on its state. 1096 * 1097 * @see android.graphics.drawable.Drawable 1098 * @see #getDrawableState() 1099 */ 1100 protected static final int[] ENABLED_STATE_SET; 1101 /** 1102 * Indicates the view is focused. States are used with 1103 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1104 * view depending on its state. 1105 * 1106 * @see android.graphics.drawable.Drawable 1107 * @see #getDrawableState() 1108 */ 1109 protected static final int[] FOCUSED_STATE_SET; 1110 /** 1111 * Indicates the view is selected. States are used with 1112 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1113 * view depending on its state. 1114 * 1115 * @see android.graphics.drawable.Drawable 1116 * @see #getDrawableState() 1117 */ 1118 protected static final int[] SELECTED_STATE_SET; 1119 /** 1120 * Indicates the view is pressed. States are used with 1121 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1122 * view depending on its state. 1123 * 1124 * @see android.graphics.drawable.Drawable 1125 * @see #getDrawableState() 1126 * @hide 1127 */ 1128 protected static final int[] PRESSED_STATE_SET; 1129 /** 1130 * Indicates the view's window has focus. States are used with 1131 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1132 * view depending on its state. 1133 * 1134 * @see android.graphics.drawable.Drawable 1135 * @see #getDrawableState() 1136 */ 1137 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1138 // Doubles 1139 /** 1140 * Indicates the view is enabled and has the focus. 1141 * 1142 * @see #ENABLED_STATE_SET 1143 * @see #FOCUSED_STATE_SET 1144 */ 1145 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1146 /** 1147 * Indicates the view is enabled and selected. 1148 * 1149 * @see #ENABLED_STATE_SET 1150 * @see #SELECTED_STATE_SET 1151 */ 1152 protected static final int[] ENABLED_SELECTED_STATE_SET; 1153 /** 1154 * Indicates the view is enabled and that its window has focus. 1155 * 1156 * @see #ENABLED_STATE_SET 1157 * @see #WINDOW_FOCUSED_STATE_SET 1158 */ 1159 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1160 /** 1161 * Indicates the view is focused and selected. 1162 * 1163 * @see #FOCUSED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 */ 1166 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1167 /** 1168 * Indicates the view has the focus and that its window has the focus. 1169 * 1170 * @see #FOCUSED_STATE_SET 1171 * @see #WINDOW_FOCUSED_STATE_SET 1172 */ 1173 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1174 /** 1175 * Indicates the view is selected and that its window has the focus. 1176 * 1177 * @see #SELECTED_STATE_SET 1178 * @see #WINDOW_FOCUSED_STATE_SET 1179 */ 1180 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1181 // Triples 1182 /** 1183 * Indicates the view is enabled, focused and selected. 1184 * 1185 * @see #ENABLED_STATE_SET 1186 * @see #FOCUSED_STATE_SET 1187 * @see #SELECTED_STATE_SET 1188 */ 1189 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1190 /** 1191 * Indicates the view is enabled, focused and its window has the focus. 1192 * 1193 * @see #ENABLED_STATE_SET 1194 * @see #FOCUSED_STATE_SET 1195 * @see #WINDOW_FOCUSED_STATE_SET 1196 */ 1197 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1198 /** 1199 * Indicates the view is enabled, selected and its window has the focus. 1200 * 1201 * @see #ENABLED_STATE_SET 1202 * @see #SELECTED_STATE_SET 1203 * @see #WINDOW_FOCUSED_STATE_SET 1204 */ 1205 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1206 /** 1207 * Indicates the view is focused, selected and its window has the focus. 1208 * 1209 * @see #FOCUSED_STATE_SET 1210 * @see #SELECTED_STATE_SET 1211 * @see #WINDOW_FOCUSED_STATE_SET 1212 */ 1213 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1214 /** 1215 * Indicates the view is enabled, focused, selected and its window 1216 * has the focus. 1217 * 1218 * @see #ENABLED_STATE_SET 1219 * @see #FOCUSED_STATE_SET 1220 * @see #SELECTED_STATE_SET 1221 * @see #WINDOW_FOCUSED_STATE_SET 1222 */ 1223 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1224 /** 1225 * Indicates the view is pressed and its window has the focus. 1226 * 1227 * @see #PRESSED_STATE_SET 1228 * @see #WINDOW_FOCUSED_STATE_SET 1229 */ 1230 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1231 /** 1232 * Indicates the view is pressed and selected. 1233 * 1234 * @see #PRESSED_STATE_SET 1235 * @see #SELECTED_STATE_SET 1236 */ 1237 protected static final int[] PRESSED_SELECTED_STATE_SET; 1238 /** 1239 * Indicates the view is pressed, selected and its window has the focus. 1240 * 1241 * @see #PRESSED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 * @see #WINDOW_FOCUSED_STATE_SET 1244 */ 1245 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1246 /** 1247 * Indicates the view is pressed and focused. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #FOCUSED_STATE_SET 1251 */ 1252 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1253 /** 1254 * Indicates the view is pressed, focused and its window has the focus. 1255 * 1256 * @see #PRESSED_STATE_SET 1257 * @see #FOCUSED_STATE_SET 1258 * @see #WINDOW_FOCUSED_STATE_SET 1259 */ 1260 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1261 /** 1262 * Indicates the view is pressed, focused and selected. 1263 * 1264 * @see #PRESSED_STATE_SET 1265 * @see #SELECTED_STATE_SET 1266 * @see #FOCUSED_STATE_SET 1267 */ 1268 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1269 /** 1270 * Indicates the view is pressed, focused, selected and its window has the focus. 1271 * 1272 * @see #PRESSED_STATE_SET 1273 * @see #FOCUSED_STATE_SET 1274 * @see #SELECTED_STATE_SET 1275 * @see #WINDOW_FOCUSED_STATE_SET 1276 */ 1277 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1278 /** 1279 * Indicates the view is pressed and enabled. 1280 * 1281 * @see #PRESSED_STATE_SET 1282 * @see #ENABLED_STATE_SET 1283 */ 1284 protected static final int[] PRESSED_ENABLED_STATE_SET; 1285 /** 1286 * Indicates the view is pressed, enabled and its window has the focus. 1287 * 1288 * @see #PRESSED_STATE_SET 1289 * @see #ENABLED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1293 /** 1294 * Indicates the view is pressed, enabled and selected. 1295 * 1296 * @see #PRESSED_STATE_SET 1297 * @see #ENABLED_STATE_SET 1298 * @see #SELECTED_STATE_SET 1299 */ 1300 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1301 /** 1302 * Indicates the view is pressed, enabled, selected and its window has the 1303 * focus. 1304 * 1305 * @see #PRESSED_STATE_SET 1306 * @see #ENABLED_STATE_SET 1307 * @see #SELECTED_STATE_SET 1308 * @see #WINDOW_FOCUSED_STATE_SET 1309 */ 1310 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1311 /** 1312 * Indicates the view is pressed, enabled and focused. 1313 * 1314 * @see #PRESSED_STATE_SET 1315 * @see #ENABLED_STATE_SET 1316 * @see #FOCUSED_STATE_SET 1317 */ 1318 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1319 /** 1320 * Indicates the view is pressed, enabled, focused and its window has the 1321 * focus. 1322 * 1323 * @see #PRESSED_STATE_SET 1324 * @see #ENABLED_STATE_SET 1325 * @see #FOCUSED_STATE_SET 1326 * @see #WINDOW_FOCUSED_STATE_SET 1327 */ 1328 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1329 /** 1330 * Indicates the view is pressed, enabled, focused and selected. 1331 * 1332 * @see #PRESSED_STATE_SET 1333 * @see #ENABLED_STATE_SET 1334 * @see #SELECTED_STATE_SET 1335 * @see #FOCUSED_STATE_SET 1336 */ 1337 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1338 /** 1339 * Indicates the view is pressed, enabled, focused, selected and its window 1340 * has the focus. 1341 * 1342 * @see #PRESSED_STATE_SET 1343 * @see #ENABLED_STATE_SET 1344 * @see #SELECTED_STATE_SET 1345 * @see #FOCUSED_STATE_SET 1346 * @see #WINDOW_FOCUSED_STATE_SET 1347 */ 1348 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1349 1350 /** 1351 * The order here is very important to {@link #getDrawableState()} 1352 */ 1353 private static final int[][] VIEW_STATE_SETS; 1354 1355 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1356 static final int VIEW_STATE_SELECTED = 1 << 1; 1357 static final int VIEW_STATE_FOCUSED = 1 << 2; 1358 static final int VIEW_STATE_ENABLED = 1 << 3; 1359 static final int VIEW_STATE_PRESSED = 1 << 4; 1360 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1361 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1362 static final int VIEW_STATE_HOVERED = 1 << 7; 1363 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1364 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1365 1366 static final int[] VIEW_STATE_IDS = new int[] { 1367 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1368 R.attr.state_selected, VIEW_STATE_SELECTED, 1369 R.attr.state_focused, VIEW_STATE_FOCUSED, 1370 R.attr.state_enabled, VIEW_STATE_ENABLED, 1371 R.attr.state_pressed, VIEW_STATE_PRESSED, 1372 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1373 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1374 R.attr.state_hovered, VIEW_STATE_HOVERED, 1375 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1376 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1377 }; 1378 1379 static { 1380 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1381 throw new IllegalStateException( 1382 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1383 } 1384 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1385 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1386 int viewState = R.styleable.ViewDrawableStates[i]; 1387 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1388 if (VIEW_STATE_IDS[j] == viewState) { 1389 orderedIds[i * 2] = viewState; 1390 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1391 } 1392 } 1393 } 1394 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1395 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1396 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1397 int numBits = Integer.bitCount(i); 1398 int[] set = new int[numBits]; 1399 int pos = 0; 1400 for (int j = 0; j < orderedIds.length; j += 2) { 1401 if ((i & orderedIds[j+1]) != 0) { 1402 set[pos++] = orderedIds[j]; 1403 } 1404 } 1405 VIEW_STATE_SETS[i] = set; 1406 } 1407 1408 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1409 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1410 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1411 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1412 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1413 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1414 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1415 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1416 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1418 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_FOCUSED]; 1421 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1422 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1423 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1424 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1425 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1426 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1427 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1428 | VIEW_STATE_ENABLED]; 1429 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1430 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1431 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1432 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1433 | VIEW_STATE_ENABLED]; 1434 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1435 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1436 | VIEW_STATE_ENABLED]; 1437 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1438 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1439 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1440 1441 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1442 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1444 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1445 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1446 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1448 | VIEW_STATE_PRESSED]; 1449 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1451 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1453 | VIEW_STATE_PRESSED]; 1454 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1456 | VIEW_STATE_PRESSED]; 1457 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1459 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1460 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1462 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1464 | VIEW_STATE_PRESSED]; 1465 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1467 | VIEW_STATE_PRESSED]; 1468 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1470 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1471 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1472 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1473 | VIEW_STATE_PRESSED]; 1474 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1476 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1477 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1479 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1480 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1482 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1483 | VIEW_STATE_PRESSED]; 1484 } 1485 1486 /** 1487 * Temporary Rect currently for use in setBackground(). This will probably 1488 * be extended in the future to hold our own class with more than just 1489 * a Rect. :) 1490 */ 1491 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1492 1493 /** 1494 * Map used to store views' tags. 1495 */ 1496 private static WeakHashMap<View, SparseArray<Object>> sTags; 1497 1498 /** 1499 * Lock used to access sTags. 1500 */ 1501 private static final Object sTagsLock = new Object(); 1502 1503 /** 1504 * The next available accessiiblity id. 1505 */ 1506 private static int sNextAccessibilityViewId; 1507 1508 /** 1509 * The animation currently associated with this view. 1510 * @hide 1511 */ 1512 protected Animation mCurrentAnimation = null; 1513 1514 /** 1515 * Width as measured during measure pass. 1516 * {@hide} 1517 */ 1518 @ViewDebug.ExportedProperty(category = "measurement") 1519 int mMeasuredWidth; 1520 1521 /** 1522 * Height as measured during measure pass. 1523 * {@hide} 1524 */ 1525 @ViewDebug.ExportedProperty(category = "measurement") 1526 int mMeasuredHeight; 1527 1528 /** 1529 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1530 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1531 * its display list. This flag, used only when hw accelerated, allows us to clear the 1532 * flag while retaining this information until it's needed (at getDisplayList() time and 1533 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1534 * 1535 * {@hide} 1536 */ 1537 boolean mRecreateDisplayList = false; 1538 1539 /** 1540 * The view's identifier. 1541 * {@hide} 1542 * 1543 * @see #setId(int) 1544 * @see #getId() 1545 */ 1546 @ViewDebug.ExportedProperty(resolveId = true) 1547 int mID = NO_ID; 1548 1549 /** 1550 * The stable ID of this view for accessibility porposes. 1551 */ 1552 int mAccessibilityViewId = NO_ID; 1553 1554 /** 1555 * The view's tag. 1556 * {@hide} 1557 * 1558 * @see #setTag(Object) 1559 * @see #getTag() 1560 */ 1561 protected Object mTag; 1562 1563 // for mPrivateFlags: 1564 /** {@hide} */ 1565 static final int WANTS_FOCUS = 0x00000001; 1566 /** {@hide} */ 1567 static final int FOCUSED = 0x00000002; 1568 /** {@hide} */ 1569 static final int SELECTED = 0x00000004; 1570 /** {@hide} */ 1571 static final int IS_ROOT_NAMESPACE = 0x00000008; 1572 /** {@hide} */ 1573 static final int HAS_BOUNDS = 0x00000010; 1574 /** {@hide} */ 1575 static final int DRAWN = 0x00000020; 1576 /** 1577 * When this flag is set, this view is running an animation on behalf of its 1578 * children and should therefore not cancel invalidate requests, even if they 1579 * lie outside of this view's bounds. 1580 * 1581 * {@hide} 1582 */ 1583 static final int DRAW_ANIMATION = 0x00000040; 1584 /** {@hide} */ 1585 static final int SKIP_DRAW = 0x00000080; 1586 /** {@hide} */ 1587 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1588 /** {@hide} */ 1589 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1590 /** {@hide} */ 1591 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1592 /** {@hide} */ 1593 static final int MEASURED_DIMENSION_SET = 0x00000800; 1594 /** {@hide} */ 1595 static final int FORCE_LAYOUT = 0x00001000; 1596 /** {@hide} */ 1597 static final int LAYOUT_REQUIRED = 0x00002000; 1598 1599 private static final int PRESSED = 0x00004000; 1600 1601 /** {@hide} */ 1602 static final int DRAWING_CACHE_VALID = 0x00008000; 1603 /** 1604 * Flag used to indicate that this view should be drawn once more (and only once 1605 * more) after its animation has completed. 1606 * {@hide} 1607 */ 1608 static final int ANIMATION_STARTED = 0x00010000; 1609 1610 private static final int SAVE_STATE_CALLED = 0x00020000; 1611 1612 /** 1613 * Indicates that the View returned true when onSetAlpha() was called and that 1614 * the alpha must be restored. 1615 * {@hide} 1616 */ 1617 static final int ALPHA_SET = 0x00040000; 1618 1619 /** 1620 * Set by {@link #setScrollContainer(boolean)}. 1621 */ 1622 static final int SCROLL_CONTAINER = 0x00080000; 1623 1624 /** 1625 * Set by {@link #setScrollContainer(boolean)}. 1626 */ 1627 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1628 1629 /** 1630 * View flag indicating whether this view was invalidated (fully or partially.) 1631 * 1632 * @hide 1633 */ 1634 static final int DIRTY = 0x00200000; 1635 1636 /** 1637 * View flag indicating whether this view was invalidated by an opaque 1638 * invalidate request. 1639 * 1640 * @hide 1641 */ 1642 static final int DIRTY_OPAQUE = 0x00400000; 1643 1644 /** 1645 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1646 * 1647 * @hide 1648 */ 1649 static final int DIRTY_MASK = 0x00600000; 1650 1651 /** 1652 * Indicates whether the background is opaque. 1653 * 1654 * @hide 1655 */ 1656 static final int OPAQUE_BACKGROUND = 0x00800000; 1657 1658 /** 1659 * Indicates whether the scrollbars are opaque. 1660 * 1661 * @hide 1662 */ 1663 static final int OPAQUE_SCROLLBARS = 0x01000000; 1664 1665 /** 1666 * Indicates whether the view is opaque. 1667 * 1668 * @hide 1669 */ 1670 static final int OPAQUE_MASK = 0x01800000; 1671 1672 /** 1673 * Indicates a prepressed state; 1674 * the short time between ACTION_DOWN and recognizing 1675 * a 'real' press. Prepressed is used to recognize quick taps 1676 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1677 * 1678 * @hide 1679 */ 1680 private static final int PREPRESSED = 0x02000000; 1681 1682 /** 1683 * Indicates whether the view is temporarily detached. 1684 * 1685 * @hide 1686 */ 1687 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1688 1689 /** 1690 * Indicates that we should awaken scroll bars once attached 1691 * 1692 * @hide 1693 */ 1694 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1695 1696 /** 1697 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1698 * @hide 1699 */ 1700 private static final int HOVERED = 0x10000000; 1701 1702 /** 1703 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1704 * for transform operations 1705 * 1706 * @hide 1707 */ 1708 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1709 1710 /** {@hide} */ 1711 static final int ACTIVATED = 0x40000000; 1712 1713 /** 1714 * Indicates that this view was specifically invalidated, not just dirtied because some 1715 * child view was invalidated. The flag is used to determine when we need to recreate 1716 * a view's display list (as opposed to just returning a reference to its existing 1717 * display list). 1718 * 1719 * @hide 1720 */ 1721 static final int INVALIDATED = 0x80000000; 1722 1723 /* Masks for mPrivateFlags2 */ 1724 1725 /** 1726 * Indicates that this view has reported that it can accept the current drag's content. 1727 * Cleared when the drag operation concludes. 1728 * @hide 1729 */ 1730 static final int DRAG_CAN_ACCEPT = 0x00000001; 1731 1732 /** 1733 * Indicates that this view is currently directly under the drag location in a 1734 * drag-and-drop operation involving content that it can accept. Cleared when 1735 * the drag exits the view, or when the drag operation concludes. 1736 * @hide 1737 */ 1738 static final int DRAG_HOVERED = 0x00000002; 1739 1740 /** 1741 * Indicates whether the view layout direction has been resolved and drawn to the 1742 * right-to-left direction. 1743 * 1744 * @hide 1745 */ 1746 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 0x00000004; 1747 1748 /** 1749 * Indicates whether the view layout direction has been resolved. 1750 * 1751 * @hide 1752 */ 1753 static final int LAYOUT_DIRECTION_RESOLVED = 0x00000008; 1754 1755 1756 /* End of masks for mPrivateFlags2 */ 1757 1758 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1759 1760 /** 1761 * Always allow a user to over-scroll this view, provided it is a 1762 * view that can scroll. 1763 * 1764 * @see #getOverScrollMode() 1765 * @see #setOverScrollMode(int) 1766 */ 1767 public static final int OVER_SCROLL_ALWAYS = 0; 1768 1769 /** 1770 * Allow a user to over-scroll this view only if the content is large 1771 * enough to meaningfully scroll, provided it is a view that can scroll. 1772 * 1773 * @see #getOverScrollMode() 1774 * @see #setOverScrollMode(int) 1775 */ 1776 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1777 1778 /** 1779 * Never allow a user to over-scroll this view. 1780 * 1781 * @see #getOverScrollMode() 1782 * @see #setOverScrollMode(int) 1783 */ 1784 public static final int OVER_SCROLL_NEVER = 2; 1785 1786 /** 1787 * View has requested the system UI (status bar) to be visible (the default). 1788 * 1789 * @see #setSystemUiVisibility(int) 1790 */ 1791 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 1792 1793 /** 1794 * View has requested the system UI to enter an unobtrusive "low profile" mode. 1795 * 1796 * This is for use in games, book readers, video players, or any other "immersive" application 1797 * where the usual system chrome is deemed too distracting. 1798 * 1799 * In low profile mode, the status bar and/or navigation icons may dim. 1800 * 1801 * @see #setSystemUiVisibility(int) 1802 */ 1803 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 1804 1805 /** 1806 * View has requested that the system navigation be temporarily hidden. 1807 * 1808 * This is an even less obtrusive state than that called for by 1809 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 1810 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 1811 * those to disappear. This is useful (in conjunction with the 1812 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 1813 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 1814 * window flags) for displaying content using every last pixel on the display. 1815 * 1816 * There is a limitation: because navigation controls are so important, the least user 1817 * interaction will cause them to reappear immediately. 1818 * 1819 * @see #setSystemUiVisibility(int) 1820 */ 1821 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 1822 1823 /** 1824 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 1825 */ 1826 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 1827 1828 /** 1829 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 1830 */ 1831 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 1832 1833 /** 1834 * @hide 1835 * 1836 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1837 * out of the public fields to keep the undefined bits out of the developer's way. 1838 * 1839 * Flag to make the status bar not expandable. Unless you also 1840 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1841 */ 1842 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1843 1844 /** 1845 * @hide 1846 * 1847 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1848 * out of the public fields to keep the undefined bits out of the developer's way. 1849 * 1850 * Flag to hide notification icons and scrolling ticker text. 1851 */ 1852 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1853 1854 /** 1855 * @hide 1856 * 1857 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1858 * out of the public fields to keep the undefined bits out of the developer's way. 1859 * 1860 * Flag to disable incoming notification alerts. This will not block 1861 * icons, but it will block sound, vibrating and other visual or aural notifications. 1862 */ 1863 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1864 1865 /** 1866 * @hide 1867 * 1868 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1869 * out of the public fields to keep the undefined bits out of the developer's way. 1870 * 1871 * Flag to hide only the scrolling ticker. Note that 1872 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1873 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1874 */ 1875 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1876 1877 /** 1878 * @hide 1879 * 1880 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1881 * out of the public fields to keep the undefined bits out of the developer's way. 1882 * 1883 * Flag to hide the center system info area. 1884 */ 1885 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1886 1887 /** 1888 * @hide 1889 * 1890 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1891 * out of the public fields to keep the undefined bits out of the developer's way. 1892 * 1893 * Flag to hide only the navigation buttons. Don't use this 1894 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1895 * 1896 * THIS DOES NOT DISABLE THE BACK BUTTON 1897 */ 1898 public static final int STATUS_BAR_DISABLE_NAVIGATION = 0x00200000; 1899 1900 /** 1901 * @hide 1902 * 1903 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1904 * out of the public fields to keep the undefined bits out of the developer's way. 1905 * 1906 * Flag to hide only the back button. Don't use this 1907 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1908 */ 1909 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1910 1911 /** 1912 * @hide 1913 * 1914 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1915 * out of the public fields to keep the undefined bits out of the developer's way. 1916 * 1917 * Flag to hide only the clock. You might use this if your activity has 1918 * its own clock making the status bar's clock redundant. 1919 */ 1920 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1921 1922 /** 1923 * @hide 1924 */ 1925 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 1926 1927 /** 1928 * Controls the over-scroll mode for this view. 1929 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1930 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1931 * and {@link #OVER_SCROLL_NEVER}. 1932 */ 1933 private int mOverScrollMode; 1934 1935 /** 1936 * The parent this view is attached to. 1937 * {@hide} 1938 * 1939 * @see #getParent() 1940 */ 1941 protected ViewParent mParent; 1942 1943 /** 1944 * {@hide} 1945 */ 1946 AttachInfo mAttachInfo; 1947 1948 /** 1949 * {@hide} 1950 */ 1951 @ViewDebug.ExportedProperty(flagMapping = { 1952 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1953 name = "FORCE_LAYOUT"), 1954 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1955 name = "LAYOUT_REQUIRED"), 1956 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1957 name = "DRAWING_CACHE_INVALID", outputIf = false), 1958 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1959 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1960 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1961 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1962 }) 1963 int mPrivateFlags; 1964 int mPrivateFlags2; 1965 1966 /** 1967 * This view's request for the visibility of the status bar. 1968 * @hide 1969 */ 1970 @ViewDebug.ExportedProperty(flagMapping = { 1971 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 1972 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 1973 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 1974 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 1975 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 1976 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 1977 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 1978 equals = SYSTEM_UI_FLAG_VISIBLE, 1979 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 1980 }) 1981 int mSystemUiVisibility; 1982 1983 /** 1984 * Count of how many windows this view has been attached to. 1985 */ 1986 int mWindowAttachCount; 1987 1988 /** 1989 * The layout parameters associated with this view and used by the parent 1990 * {@link android.view.ViewGroup} to determine how this view should be 1991 * laid out. 1992 * {@hide} 1993 */ 1994 protected ViewGroup.LayoutParams mLayoutParams; 1995 1996 /** 1997 * The view flags hold various views states. 1998 * {@hide} 1999 */ 2000 @ViewDebug.ExportedProperty 2001 int mViewFlags; 2002 2003 /** 2004 * The transform matrix for the View. This transform is calculated internally 2005 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2006 * is used by default. Do *not* use this variable directly; instead call 2007 * getMatrix(), which will automatically recalculate the matrix if necessary 2008 * to get the correct matrix based on the latest rotation and scale properties. 2009 */ 2010 private final Matrix mMatrix = new Matrix(); 2011 2012 /** 2013 * The transform matrix for the View. This transform is calculated internally 2014 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2015 * is used by default. Do *not* use this variable directly; instead call 2016 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2017 * to get the correct matrix based on the latest rotation and scale properties. 2018 */ 2019 private Matrix mInverseMatrix; 2020 2021 /** 2022 * An internal variable that tracks whether we need to recalculate the 2023 * transform matrix, based on whether the rotation or scaleX/Y properties 2024 * have changed since the matrix was last calculated. 2025 */ 2026 boolean mMatrixDirty = false; 2027 2028 /** 2029 * An internal variable that tracks whether we need to recalculate the 2030 * transform matrix, based on whether the rotation or scaleX/Y properties 2031 * have changed since the matrix was last calculated. 2032 */ 2033 private boolean mInverseMatrixDirty = true; 2034 2035 /** 2036 * A variable that tracks whether we need to recalculate the 2037 * transform matrix, based on whether the rotation or scaleX/Y properties 2038 * have changed since the matrix was last calculated. This variable 2039 * is only valid after a call to updateMatrix() or to a function that 2040 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2041 */ 2042 private boolean mMatrixIsIdentity = true; 2043 2044 /** 2045 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2046 */ 2047 private Camera mCamera = null; 2048 2049 /** 2050 * This matrix is used when computing the matrix for 3D rotations. 2051 */ 2052 private Matrix matrix3D = null; 2053 2054 /** 2055 * These prev values are used to recalculate a centered pivot point when necessary. The 2056 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2057 * set), so thes values are only used then as well. 2058 */ 2059 private int mPrevWidth = -1; 2060 private int mPrevHeight = -1; 2061 2062 private boolean mLastIsOpaque; 2063 2064 /** 2065 * Convenience value to check for float values that are close enough to zero to be considered 2066 * zero. 2067 */ 2068 private static final float NONZERO_EPSILON = .001f; 2069 2070 /** 2071 * The degrees rotation around the vertical axis through the pivot point. 2072 */ 2073 @ViewDebug.ExportedProperty 2074 float mRotationY = 0f; 2075 2076 /** 2077 * The degrees rotation around the horizontal axis through the pivot point. 2078 */ 2079 @ViewDebug.ExportedProperty 2080 float mRotationX = 0f; 2081 2082 /** 2083 * The degrees rotation around the pivot point. 2084 */ 2085 @ViewDebug.ExportedProperty 2086 float mRotation = 0f; 2087 2088 /** 2089 * The amount of translation of the object away from its left property (post-layout). 2090 */ 2091 @ViewDebug.ExportedProperty 2092 float mTranslationX = 0f; 2093 2094 /** 2095 * The amount of translation of the object away from its top property (post-layout). 2096 */ 2097 @ViewDebug.ExportedProperty 2098 float mTranslationY = 0f; 2099 2100 /** 2101 * The amount of scale in the x direction around the pivot point. A 2102 * value of 1 means no scaling is applied. 2103 */ 2104 @ViewDebug.ExportedProperty 2105 float mScaleX = 1f; 2106 2107 /** 2108 * The amount of scale in the y direction around the pivot point. A 2109 * value of 1 means no scaling is applied. 2110 */ 2111 @ViewDebug.ExportedProperty 2112 float mScaleY = 1f; 2113 2114 /** 2115 * The amount of scale in the x direction around the pivot point. A 2116 * value of 1 means no scaling is applied. 2117 */ 2118 @ViewDebug.ExportedProperty 2119 float mPivotX = 0f; 2120 2121 /** 2122 * The amount of scale in the y direction around the pivot point. A 2123 * value of 1 means no scaling is applied. 2124 */ 2125 @ViewDebug.ExportedProperty 2126 float mPivotY = 0f; 2127 2128 /** 2129 * The opacity of the View. This is a value from 0 to 1, where 0 means 2130 * completely transparent and 1 means completely opaque. 2131 */ 2132 @ViewDebug.ExportedProperty 2133 float mAlpha = 1f; 2134 2135 /** 2136 * The distance in pixels from the left edge of this view's parent 2137 * to the left edge of this view. 2138 * {@hide} 2139 */ 2140 @ViewDebug.ExportedProperty(category = "layout") 2141 protected int mLeft; 2142 /** 2143 * The distance in pixels from the left edge of this view's parent 2144 * to the right edge of this view. 2145 * {@hide} 2146 */ 2147 @ViewDebug.ExportedProperty(category = "layout") 2148 protected int mRight; 2149 /** 2150 * The distance in pixels from the top edge of this view's parent 2151 * to the top edge of this view. 2152 * {@hide} 2153 */ 2154 @ViewDebug.ExportedProperty(category = "layout") 2155 protected int mTop; 2156 /** 2157 * The distance in pixels from the top edge of this view's parent 2158 * to the bottom edge of this view. 2159 * {@hide} 2160 */ 2161 @ViewDebug.ExportedProperty(category = "layout") 2162 protected int mBottom; 2163 2164 /** 2165 * The offset, in pixels, by which the content of this view is scrolled 2166 * horizontally. 2167 * {@hide} 2168 */ 2169 @ViewDebug.ExportedProperty(category = "scrolling") 2170 protected int mScrollX; 2171 /** 2172 * The offset, in pixels, by which the content of this view is scrolled 2173 * vertically. 2174 * {@hide} 2175 */ 2176 @ViewDebug.ExportedProperty(category = "scrolling") 2177 protected int mScrollY; 2178 2179 /** 2180 * The left padding in pixels, that is the distance in pixels between the 2181 * left edge of this view and the left edge of its content. 2182 * {@hide} 2183 */ 2184 @ViewDebug.ExportedProperty(category = "padding") 2185 protected int mPaddingLeft; 2186 /** 2187 * The right padding in pixels, that is the distance in pixels between the 2188 * right edge of this view and the right edge of its content. 2189 * {@hide} 2190 */ 2191 @ViewDebug.ExportedProperty(category = "padding") 2192 protected int mPaddingRight; 2193 /** 2194 * The top padding in pixels, that is the distance in pixels between the 2195 * top edge of this view and the top edge of its content. 2196 * {@hide} 2197 */ 2198 @ViewDebug.ExportedProperty(category = "padding") 2199 protected int mPaddingTop; 2200 /** 2201 * The bottom padding in pixels, that is the distance in pixels between the 2202 * bottom edge of this view and the bottom edge of its content. 2203 * {@hide} 2204 */ 2205 @ViewDebug.ExportedProperty(category = "padding") 2206 protected int mPaddingBottom; 2207 2208 /** 2209 * Briefly describes the view and is primarily used for accessibility support. 2210 */ 2211 private CharSequence mContentDescription; 2212 2213 /** 2214 * Cache the paddingRight set by the user to append to the scrollbar's size. 2215 * 2216 * @hide 2217 */ 2218 @ViewDebug.ExportedProperty(category = "padding") 2219 protected int mUserPaddingRight; 2220 2221 /** 2222 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2223 * 2224 * @hide 2225 */ 2226 @ViewDebug.ExportedProperty(category = "padding") 2227 protected int mUserPaddingBottom; 2228 2229 /** 2230 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2231 * 2232 * @hide 2233 */ 2234 @ViewDebug.ExportedProperty(category = "padding") 2235 protected int mUserPaddingLeft; 2236 2237 /** 2238 * Cache if the user padding is relative. 2239 * 2240 */ 2241 @ViewDebug.ExportedProperty(category = "padding") 2242 boolean mUserPaddingRelative; 2243 2244 /** 2245 * Cache the paddingStart set by the user to append to the scrollbar's size. 2246 * 2247 */ 2248 @ViewDebug.ExportedProperty(category = "padding") 2249 int mUserPaddingStart; 2250 2251 /** 2252 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2253 * 2254 */ 2255 @ViewDebug.ExportedProperty(category = "padding") 2256 int mUserPaddingEnd; 2257 2258 /** 2259 * @hide 2260 */ 2261 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2262 /** 2263 * @hide 2264 */ 2265 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2266 2267 private Resources mResources = null; 2268 2269 private Drawable mBGDrawable; 2270 2271 private int mBackgroundResource; 2272 private boolean mBackgroundSizeChanged; 2273 2274 /** 2275 * Listener used to dispatch focus change events. 2276 * This field should be made private, so it is hidden from the SDK. 2277 * {@hide} 2278 */ 2279 protected OnFocusChangeListener mOnFocusChangeListener; 2280 2281 /** 2282 * Listeners for layout change events. 2283 */ 2284 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2285 2286 /** 2287 * Listeners for attach events. 2288 */ 2289 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2290 2291 /** 2292 * Listener used to dispatch click events. 2293 * This field should be made private, so it is hidden from the SDK. 2294 * {@hide} 2295 */ 2296 protected OnClickListener mOnClickListener; 2297 2298 /** 2299 * Listener used to dispatch long click events. 2300 * This field should be made private, so it is hidden from the SDK. 2301 * {@hide} 2302 */ 2303 protected OnLongClickListener mOnLongClickListener; 2304 2305 /** 2306 * Listener used to build the context menu. 2307 * This field should be made private, so it is hidden from the SDK. 2308 * {@hide} 2309 */ 2310 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2311 2312 private OnKeyListener mOnKeyListener; 2313 2314 private OnTouchListener mOnTouchListener; 2315 2316 private OnHoverListener mOnHoverListener; 2317 2318 private OnGenericMotionListener mOnGenericMotionListener; 2319 2320 private OnDragListener mOnDragListener; 2321 2322 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2323 2324 /** 2325 * The application environment this view lives in. 2326 * This field should be made private, so it is hidden from the SDK. 2327 * {@hide} 2328 */ 2329 protected Context mContext; 2330 2331 private ScrollabilityCache mScrollCache; 2332 2333 private int[] mDrawableState = null; 2334 2335 /** 2336 * Set to true when drawing cache is enabled and cannot be created. 2337 * 2338 * @hide 2339 */ 2340 public boolean mCachingFailed; 2341 2342 private Bitmap mDrawingCache; 2343 private Bitmap mUnscaledDrawingCache; 2344 private HardwareLayer mHardwareLayer; 2345 DisplayList mDisplayList; 2346 2347 /** 2348 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2349 * the user may specify which view to go to next. 2350 */ 2351 private int mNextFocusLeftId = View.NO_ID; 2352 2353 /** 2354 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2355 * the user may specify which view to go to next. 2356 */ 2357 private int mNextFocusRightId = View.NO_ID; 2358 2359 /** 2360 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2361 * the user may specify which view to go to next. 2362 */ 2363 private int mNextFocusUpId = View.NO_ID; 2364 2365 /** 2366 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2367 * the user may specify which view to go to next. 2368 */ 2369 private int mNextFocusDownId = View.NO_ID; 2370 2371 /** 2372 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2373 * the user may specify which view to go to next. 2374 */ 2375 int mNextFocusForwardId = View.NO_ID; 2376 2377 private CheckForLongPress mPendingCheckForLongPress; 2378 private CheckForTap mPendingCheckForTap = null; 2379 private PerformClick mPerformClick; 2380 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2381 2382 private UnsetPressedState mUnsetPressedState; 2383 2384 /** 2385 * Whether the long press's action has been invoked. The tap's action is invoked on the 2386 * up event while a long press is invoked as soon as the long press duration is reached, so 2387 * a long press could be performed before the tap is checked, in which case the tap's action 2388 * should not be invoked. 2389 */ 2390 private boolean mHasPerformedLongPress; 2391 2392 /** 2393 * The minimum height of the view. We'll try our best to have the height 2394 * of this view to at least this amount. 2395 */ 2396 @ViewDebug.ExportedProperty(category = "measurement") 2397 private int mMinHeight; 2398 2399 /** 2400 * The minimum width of the view. We'll try our best to have the width 2401 * of this view to at least this amount. 2402 */ 2403 @ViewDebug.ExportedProperty(category = "measurement") 2404 private int mMinWidth; 2405 2406 /** 2407 * The delegate to handle touch events that are physically in this view 2408 * but should be handled by another view. 2409 */ 2410 private TouchDelegate mTouchDelegate = null; 2411 2412 /** 2413 * Solid color to use as a background when creating the drawing cache. Enables 2414 * the cache to use 16 bit bitmaps instead of 32 bit. 2415 */ 2416 private int mDrawingCacheBackgroundColor = 0; 2417 2418 /** 2419 * Special tree observer used when mAttachInfo is null. 2420 */ 2421 private ViewTreeObserver mFloatingTreeObserver; 2422 2423 /** 2424 * Cache the touch slop from the context that created the view. 2425 */ 2426 private int mTouchSlop; 2427 2428 /** 2429 * Object that handles automatic animation of view properties. 2430 */ 2431 private ViewPropertyAnimator mAnimator = null; 2432 2433 /** 2434 * Flag indicating that a drag can cross window boundaries. When 2435 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2436 * with this flag set, all visible applications will be able to participate 2437 * in the drag operation and receive the dragged content. 2438 * 2439 * @hide 2440 */ 2441 public static final int DRAG_FLAG_GLOBAL = 1; 2442 2443 /** 2444 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2445 */ 2446 private float mVerticalScrollFactor; 2447 2448 /** 2449 * Position of the vertical scroll bar. 2450 */ 2451 private int mVerticalScrollbarPosition; 2452 2453 /** 2454 * Position the scroll bar at the default position as determined by the system. 2455 */ 2456 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2457 2458 /** 2459 * Position the scroll bar along the left edge. 2460 */ 2461 public static final int SCROLLBAR_POSITION_LEFT = 1; 2462 2463 /** 2464 * Position the scroll bar along the right edge. 2465 */ 2466 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2467 2468 /** 2469 * Indicates that the view does not have a layer. 2470 * 2471 * @see #getLayerType() 2472 * @see #setLayerType(int, android.graphics.Paint) 2473 * @see #LAYER_TYPE_SOFTWARE 2474 * @see #LAYER_TYPE_HARDWARE 2475 */ 2476 public static final int LAYER_TYPE_NONE = 0; 2477 2478 /** 2479 * <p>Indicates that the view has a software layer. A software layer is backed 2480 * by a bitmap and causes the view to be rendered using Android's software 2481 * rendering pipeline, even if hardware acceleration is enabled.</p> 2482 * 2483 * <p>Software layers have various usages:</p> 2484 * <p>When the application is not using hardware acceleration, a software layer 2485 * is useful to apply a specific color filter and/or blending mode and/or 2486 * translucency to a view and all its children.</p> 2487 * <p>When the application is using hardware acceleration, a software layer 2488 * is useful to render drawing primitives not supported by the hardware 2489 * accelerated pipeline. It can also be used to cache a complex view tree 2490 * into a texture and reduce the complexity of drawing operations. For instance, 2491 * when animating a complex view tree with a translation, a software layer can 2492 * be used to render the view tree only once.</p> 2493 * <p>Software layers should be avoided when the affected view tree updates 2494 * often. Every update will require to re-render the software layer, which can 2495 * potentially be slow (particularly when hardware acceleration is turned on 2496 * since the layer will have to be uploaded into a hardware texture after every 2497 * update.)</p> 2498 * 2499 * @see #getLayerType() 2500 * @see #setLayerType(int, android.graphics.Paint) 2501 * @see #LAYER_TYPE_NONE 2502 * @see #LAYER_TYPE_HARDWARE 2503 */ 2504 public static final int LAYER_TYPE_SOFTWARE = 1; 2505 2506 /** 2507 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2508 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2509 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2510 * rendering pipeline, but only if hardware acceleration is turned on for the 2511 * view hierarchy. When hardware acceleration is turned off, hardware layers 2512 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2513 * 2514 * <p>A hardware layer is useful to apply a specific color filter and/or 2515 * blending mode and/or translucency to a view and all its children.</p> 2516 * <p>A hardware layer can be used to cache a complex view tree into a 2517 * texture and reduce the complexity of drawing operations. For instance, 2518 * when animating a complex view tree with a translation, a hardware layer can 2519 * be used to render the view tree only once.</p> 2520 * <p>A hardware layer can also be used to increase the rendering quality when 2521 * rotation transformations are applied on a view. It can also be used to 2522 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2523 * 2524 * @see #getLayerType() 2525 * @see #setLayerType(int, android.graphics.Paint) 2526 * @see #LAYER_TYPE_NONE 2527 * @see #LAYER_TYPE_SOFTWARE 2528 */ 2529 public static final int LAYER_TYPE_HARDWARE = 2; 2530 2531 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2532 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2533 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2534 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2535 }) 2536 int mLayerType = LAYER_TYPE_NONE; 2537 Paint mLayerPaint; 2538 Rect mLocalDirtyRect; 2539 2540 /** 2541 * Set to true when the view is sending hover accessibility events because it 2542 * is the innermost hovered view. 2543 */ 2544 private boolean mSendingHoverAccessibilityEvents; 2545 2546 /** 2547 * Text direction is inherited thru {@link ViewGroup} 2548 * @hide 2549 */ 2550 public static final int TEXT_DIRECTION_INHERIT = 0; 2551 2552 /** 2553 * Text direction is using "first strong algorithm". The first strong directional character 2554 * determines the paragraph direction. If there is no strong directional character, the 2555 * paragraph direction is the view's resolved ayout direction. 2556 * 2557 * @hide 2558 */ 2559 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 2560 2561 /** 2562 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 2563 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 2564 * If there are neither, the paragraph direction is the view's resolved layout direction. 2565 * 2566 * @hide 2567 */ 2568 public static final int TEXT_DIRECTION_ANY_RTL = 2; 2569 2570 /** 2571 * Text direction is the same as the one held by a 60% majority of the characters. If there is 2572 * no majority then the paragraph direction is the resolved layout direction of the View. 2573 * 2574 * @hide 2575 */ 2576 public static final int TEXT_DIRECTION_CHAR_COUNT = 3; 2577 2578 /** 2579 * Text direction is forced to LTR. 2580 * 2581 * @hide 2582 */ 2583 public static final int TEXT_DIRECTION_LTR = 4; 2584 2585 /** 2586 * Text direction is forced to RTL. 2587 * 2588 * @hide 2589 */ 2590 public static final int TEXT_DIRECTION_RTL = 5; 2591 2592 /** 2593 * Default text direction is inherited 2594 */ 2595 protected static int DEFAULT_TEXT_DIRECTION = TEXT_DIRECTION_INHERIT; 2596 2597 /** 2598 * The text direction that has been defined by {@link #setTextDirection(int)}. 2599 * 2600 * {@hide} 2601 */ 2602 @ViewDebug.ExportedProperty(category = "text", mapping = { 2603 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2604 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2605 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2606 @ViewDebug.IntToString(from = TEXT_DIRECTION_CHAR_COUNT, to = "CHAR_COUNT"), 2607 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2608 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL") 2609 }) 2610 private int mTextDirection = DEFAULT_TEXT_DIRECTION; 2611 2612 /** 2613 * The resolved text direction. This needs resolution if the value is 2614 * TEXT_DIRECTION_INHERIT. The resolution matches mTextDirection if that is 2615 * not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds up the parent 2616 * chain of the view. 2617 * 2618 * {@hide} 2619 */ 2620 @ViewDebug.ExportedProperty(category = "text", mapping = { 2621 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2622 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2623 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2624 @ViewDebug.IntToString(from = TEXT_DIRECTION_CHAR_COUNT, to = "CHAR_COUNT"), 2625 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2626 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL") 2627 }) 2628 private int mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 2629 2630 /** 2631 * Consistency verifier for debugging purposes. 2632 * @hide 2633 */ 2634 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2635 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2636 new InputEventConsistencyVerifier(this, 0) : null; 2637 2638 /** 2639 * Simple constructor to use when creating a view from code. 2640 * 2641 * @param context The Context the view is running in, through which it can 2642 * access the current theme, resources, etc. 2643 */ 2644 public View(Context context) { 2645 mContext = context; 2646 mResources = context != null ? context.getResources() : null; 2647 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT; 2648 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2649 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2650 mUserPaddingStart = -1; 2651 mUserPaddingEnd = -1; 2652 mUserPaddingRelative = false; 2653 } 2654 2655 /** 2656 * Constructor that is called when inflating a view from XML. This is called 2657 * when a view is being constructed from an XML file, supplying attributes 2658 * that were specified in the XML file. This version uses a default style of 2659 * 0, so the only attribute values applied are those in the Context's Theme 2660 * and the given AttributeSet. 2661 * 2662 * <p> 2663 * The method onFinishInflate() will be called after all children have been 2664 * added. 2665 * 2666 * @param context The Context the view is running in, through which it can 2667 * access the current theme, resources, etc. 2668 * @param attrs The attributes of the XML tag that is inflating the view. 2669 * @see #View(Context, AttributeSet, int) 2670 */ 2671 public View(Context context, AttributeSet attrs) { 2672 this(context, attrs, 0); 2673 } 2674 2675 /** 2676 * Perform inflation from XML and apply a class-specific base style. This 2677 * constructor of View allows subclasses to use their own base style when 2678 * they are inflating. For example, a Button class's constructor would call 2679 * this version of the super class constructor and supply 2680 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2681 * the theme's button style to modify all of the base view attributes (in 2682 * particular its background) as well as the Button class's attributes. 2683 * 2684 * @param context The Context the view is running in, through which it can 2685 * access the current theme, resources, etc. 2686 * @param attrs The attributes of the XML tag that is inflating the view. 2687 * @param defStyle The default style to apply to this view. If 0, no style 2688 * will be applied (beyond what is included in the theme). This may 2689 * either be an attribute resource, whose value will be retrieved 2690 * from the current theme, or an explicit style resource. 2691 * @see #View(Context, AttributeSet) 2692 */ 2693 public View(Context context, AttributeSet attrs, int defStyle) { 2694 this(context); 2695 2696 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2697 defStyle, 0); 2698 2699 Drawable background = null; 2700 2701 int leftPadding = -1; 2702 int topPadding = -1; 2703 int rightPadding = -1; 2704 int bottomPadding = -1; 2705 int startPadding = -1; 2706 int endPadding = -1; 2707 2708 int padding = -1; 2709 2710 int viewFlagValues = 0; 2711 int viewFlagMasks = 0; 2712 2713 boolean setScrollContainer = false; 2714 2715 int x = 0; 2716 int y = 0; 2717 2718 float tx = 0; 2719 float ty = 0; 2720 float rotation = 0; 2721 float rotationX = 0; 2722 float rotationY = 0; 2723 float sx = 1f; 2724 float sy = 1f; 2725 boolean transformSet = false; 2726 2727 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2728 2729 int overScrollMode = mOverScrollMode; 2730 final int N = a.getIndexCount(); 2731 for (int i = 0; i < N; i++) { 2732 int attr = a.getIndex(i); 2733 switch (attr) { 2734 case com.android.internal.R.styleable.View_background: 2735 background = a.getDrawable(attr); 2736 break; 2737 case com.android.internal.R.styleable.View_padding: 2738 padding = a.getDimensionPixelSize(attr, -1); 2739 break; 2740 case com.android.internal.R.styleable.View_paddingLeft: 2741 leftPadding = a.getDimensionPixelSize(attr, -1); 2742 break; 2743 case com.android.internal.R.styleable.View_paddingTop: 2744 topPadding = a.getDimensionPixelSize(attr, -1); 2745 break; 2746 case com.android.internal.R.styleable.View_paddingRight: 2747 rightPadding = a.getDimensionPixelSize(attr, -1); 2748 break; 2749 case com.android.internal.R.styleable.View_paddingBottom: 2750 bottomPadding = a.getDimensionPixelSize(attr, -1); 2751 break; 2752 case com.android.internal.R.styleable.View_paddingStart: 2753 startPadding = a.getDimensionPixelSize(attr, -1); 2754 break; 2755 case com.android.internal.R.styleable.View_paddingEnd: 2756 endPadding = a.getDimensionPixelSize(attr, -1); 2757 break; 2758 case com.android.internal.R.styleable.View_scrollX: 2759 x = a.getDimensionPixelOffset(attr, 0); 2760 break; 2761 case com.android.internal.R.styleable.View_scrollY: 2762 y = a.getDimensionPixelOffset(attr, 0); 2763 break; 2764 case com.android.internal.R.styleable.View_alpha: 2765 setAlpha(a.getFloat(attr, 1f)); 2766 break; 2767 case com.android.internal.R.styleable.View_transformPivotX: 2768 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2769 break; 2770 case com.android.internal.R.styleable.View_transformPivotY: 2771 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2772 break; 2773 case com.android.internal.R.styleable.View_translationX: 2774 tx = a.getDimensionPixelOffset(attr, 0); 2775 transformSet = true; 2776 break; 2777 case com.android.internal.R.styleable.View_translationY: 2778 ty = a.getDimensionPixelOffset(attr, 0); 2779 transformSet = true; 2780 break; 2781 case com.android.internal.R.styleable.View_rotation: 2782 rotation = a.getFloat(attr, 0); 2783 transformSet = true; 2784 break; 2785 case com.android.internal.R.styleable.View_rotationX: 2786 rotationX = a.getFloat(attr, 0); 2787 transformSet = true; 2788 break; 2789 case com.android.internal.R.styleable.View_rotationY: 2790 rotationY = a.getFloat(attr, 0); 2791 transformSet = true; 2792 break; 2793 case com.android.internal.R.styleable.View_scaleX: 2794 sx = a.getFloat(attr, 1f); 2795 transformSet = true; 2796 break; 2797 case com.android.internal.R.styleable.View_scaleY: 2798 sy = a.getFloat(attr, 1f); 2799 transformSet = true; 2800 break; 2801 case com.android.internal.R.styleable.View_id: 2802 mID = a.getResourceId(attr, NO_ID); 2803 break; 2804 case com.android.internal.R.styleable.View_tag: 2805 mTag = a.getText(attr); 2806 break; 2807 case com.android.internal.R.styleable.View_fitsSystemWindows: 2808 if (a.getBoolean(attr, false)) { 2809 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2810 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2811 } 2812 break; 2813 case com.android.internal.R.styleable.View_focusable: 2814 if (a.getBoolean(attr, false)) { 2815 viewFlagValues |= FOCUSABLE; 2816 viewFlagMasks |= FOCUSABLE_MASK; 2817 } 2818 break; 2819 case com.android.internal.R.styleable.View_focusableInTouchMode: 2820 if (a.getBoolean(attr, false)) { 2821 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2822 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2823 } 2824 break; 2825 case com.android.internal.R.styleable.View_clickable: 2826 if (a.getBoolean(attr, false)) { 2827 viewFlagValues |= CLICKABLE; 2828 viewFlagMasks |= CLICKABLE; 2829 } 2830 break; 2831 case com.android.internal.R.styleable.View_longClickable: 2832 if (a.getBoolean(attr, false)) { 2833 viewFlagValues |= LONG_CLICKABLE; 2834 viewFlagMasks |= LONG_CLICKABLE; 2835 } 2836 break; 2837 case com.android.internal.R.styleable.View_saveEnabled: 2838 if (!a.getBoolean(attr, true)) { 2839 viewFlagValues |= SAVE_DISABLED; 2840 viewFlagMasks |= SAVE_DISABLED_MASK; 2841 } 2842 break; 2843 case com.android.internal.R.styleable.View_duplicateParentState: 2844 if (a.getBoolean(attr, false)) { 2845 viewFlagValues |= DUPLICATE_PARENT_STATE; 2846 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2847 } 2848 break; 2849 case com.android.internal.R.styleable.View_visibility: 2850 final int visibility = a.getInt(attr, 0); 2851 if (visibility != 0) { 2852 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2853 viewFlagMasks |= VISIBILITY_MASK; 2854 } 2855 break; 2856 case com.android.internal.R.styleable.View_layoutDirection: 2857 // Clear any HORIZONTAL_DIRECTION flag already set 2858 viewFlagValues &= ~LAYOUT_DIRECTION_MASK; 2859 // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute 2860 final int layoutDirection = a.getInt(attr, -1); 2861 if (layoutDirection != -1) { 2862 viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection]; 2863 } else { 2864 // Set to default (LAYOUT_DIRECTION_INHERIT) 2865 viewFlagValues |= LAYOUT_DIRECTION_DEFAULT; 2866 } 2867 viewFlagMasks |= LAYOUT_DIRECTION_MASK; 2868 break; 2869 case com.android.internal.R.styleable.View_drawingCacheQuality: 2870 final int cacheQuality = a.getInt(attr, 0); 2871 if (cacheQuality != 0) { 2872 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2873 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2874 } 2875 break; 2876 case com.android.internal.R.styleable.View_contentDescription: 2877 mContentDescription = a.getString(attr); 2878 break; 2879 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2880 if (!a.getBoolean(attr, true)) { 2881 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2882 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2883 } 2884 break; 2885 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2886 if (!a.getBoolean(attr, true)) { 2887 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2888 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2889 } 2890 break; 2891 case R.styleable.View_scrollbars: 2892 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2893 if (scrollbars != SCROLLBARS_NONE) { 2894 viewFlagValues |= scrollbars; 2895 viewFlagMasks |= SCROLLBARS_MASK; 2896 initializeScrollbars(a); 2897 } 2898 break; 2899 case R.styleable.View_fadingEdge: 2900 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2901 if (fadingEdge != FADING_EDGE_NONE) { 2902 viewFlagValues |= fadingEdge; 2903 viewFlagMasks |= FADING_EDGE_MASK; 2904 initializeFadingEdge(a); 2905 } 2906 break; 2907 case R.styleable.View_scrollbarStyle: 2908 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2909 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2910 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2911 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2912 } 2913 break; 2914 case R.styleable.View_isScrollContainer: 2915 setScrollContainer = true; 2916 if (a.getBoolean(attr, false)) { 2917 setScrollContainer(true); 2918 } 2919 break; 2920 case com.android.internal.R.styleable.View_keepScreenOn: 2921 if (a.getBoolean(attr, false)) { 2922 viewFlagValues |= KEEP_SCREEN_ON; 2923 viewFlagMasks |= KEEP_SCREEN_ON; 2924 } 2925 break; 2926 case R.styleable.View_filterTouchesWhenObscured: 2927 if (a.getBoolean(attr, false)) { 2928 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2929 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2930 } 2931 break; 2932 case R.styleable.View_nextFocusLeft: 2933 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2934 break; 2935 case R.styleable.View_nextFocusRight: 2936 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2937 break; 2938 case R.styleable.View_nextFocusUp: 2939 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2940 break; 2941 case R.styleable.View_nextFocusDown: 2942 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2943 break; 2944 case R.styleable.View_nextFocusForward: 2945 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2946 break; 2947 case R.styleable.View_minWidth: 2948 mMinWidth = a.getDimensionPixelSize(attr, 0); 2949 break; 2950 case R.styleable.View_minHeight: 2951 mMinHeight = a.getDimensionPixelSize(attr, 0); 2952 break; 2953 case R.styleable.View_onClick: 2954 if (context.isRestricted()) { 2955 throw new IllegalStateException("The android:onClick attribute cannot " 2956 + "be used within a restricted context"); 2957 } 2958 2959 final String handlerName = a.getString(attr); 2960 if (handlerName != null) { 2961 setOnClickListener(new OnClickListener() { 2962 private Method mHandler; 2963 2964 public void onClick(View v) { 2965 if (mHandler == null) { 2966 try { 2967 mHandler = getContext().getClass().getMethod(handlerName, 2968 View.class); 2969 } catch (NoSuchMethodException e) { 2970 int id = getId(); 2971 String idText = id == NO_ID ? "" : " with id '" 2972 + getContext().getResources().getResourceEntryName( 2973 id) + "'"; 2974 throw new IllegalStateException("Could not find a method " + 2975 handlerName + "(View) in the activity " 2976 + getContext().getClass() + " for onClick handler" 2977 + " on view " + View.this.getClass() + idText, e); 2978 } 2979 } 2980 2981 try { 2982 mHandler.invoke(getContext(), View.this); 2983 } catch (IllegalAccessException e) { 2984 throw new IllegalStateException("Could not execute non " 2985 + "public method of the activity", e); 2986 } catch (InvocationTargetException e) { 2987 throw new IllegalStateException("Could not execute " 2988 + "method of the activity", e); 2989 } 2990 } 2991 }); 2992 } 2993 break; 2994 case R.styleable.View_overScrollMode: 2995 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2996 break; 2997 case R.styleable.View_verticalScrollbarPosition: 2998 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2999 break; 3000 case R.styleable.View_layerType: 3001 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3002 break; 3003 case R.styleable.View_textDirection: 3004 mTextDirection = a.getInt(attr, DEFAULT_TEXT_DIRECTION); 3005 break; 3006 } 3007 } 3008 3009 setOverScrollMode(overScrollMode); 3010 3011 if (background != null) { 3012 setBackgroundDrawable(background); 3013 } 3014 3015 mUserPaddingRelative = (startPadding >= 0 || endPadding >= 0); 3016 3017 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3018 // layout direction). Those cached values will be used later during padding resolution. 3019 mUserPaddingStart = startPadding; 3020 mUserPaddingEnd = endPadding; 3021 3022 if (padding >= 0) { 3023 leftPadding = padding; 3024 topPadding = padding; 3025 rightPadding = padding; 3026 bottomPadding = padding; 3027 } 3028 3029 // If the user specified the padding (either with android:padding or 3030 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3031 // use the default padding or the padding from the background drawable 3032 // (stored at this point in mPadding*) 3033 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3034 topPadding >= 0 ? topPadding : mPaddingTop, 3035 rightPadding >= 0 ? rightPadding : mPaddingRight, 3036 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3037 3038 if (viewFlagMasks != 0) { 3039 setFlags(viewFlagValues, viewFlagMasks); 3040 } 3041 3042 // Needs to be called after mViewFlags is set 3043 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3044 recomputePadding(); 3045 } 3046 3047 if (x != 0 || y != 0) { 3048 scrollTo(x, y); 3049 } 3050 3051 if (transformSet) { 3052 setTranslationX(tx); 3053 setTranslationY(ty); 3054 setRotation(rotation); 3055 setRotationX(rotationX); 3056 setRotationY(rotationY); 3057 setScaleX(sx); 3058 setScaleY(sy); 3059 } 3060 3061 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3062 setScrollContainer(true); 3063 } 3064 3065 computeOpaqueFlags(); 3066 3067 a.recycle(); 3068 } 3069 3070 /** 3071 * Non-public constructor for use in testing 3072 */ 3073 View() { 3074 } 3075 3076 /** 3077 * <p> 3078 * Initializes the fading edges from a given set of styled attributes. This 3079 * method should be called by subclasses that need fading edges and when an 3080 * instance of these subclasses is created programmatically rather than 3081 * being inflated from XML. This method is automatically called when the XML 3082 * is inflated. 3083 * </p> 3084 * 3085 * @param a the styled attributes set to initialize the fading edges from 3086 */ 3087 protected void initializeFadingEdge(TypedArray a) { 3088 initScrollCache(); 3089 3090 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3091 R.styleable.View_fadingEdgeLength, 3092 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3093 } 3094 3095 /** 3096 * Returns the size of the vertical faded edges used to indicate that more 3097 * content in this view is visible. 3098 * 3099 * @return The size in pixels of the vertical faded edge or 0 if vertical 3100 * faded edges are not enabled for this view. 3101 * @attr ref android.R.styleable#View_fadingEdgeLength 3102 */ 3103 public int getVerticalFadingEdgeLength() { 3104 if (isVerticalFadingEdgeEnabled()) { 3105 ScrollabilityCache cache = mScrollCache; 3106 if (cache != null) { 3107 return cache.fadingEdgeLength; 3108 } 3109 } 3110 return 0; 3111 } 3112 3113 /** 3114 * Set the size of the faded edge used to indicate that more content in this 3115 * view is available. Will not change whether the fading edge is enabled; use 3116 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3117 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3118 * for the vertical or horizontal fading edges. 3119 * 3120 * @param length The size in pixels of the faded edge used to indicate that more 3121 * content in this view is visible. 3122 */ 3123 public void setFadingEdgeLength(int length) { 3124 initScrollCache(); 3125 mScrollCache.fadingEdgeLength = length; 3126 } 3127 3128 /** 3129 * Returns the size of the horizontal faded edges used to indicate that more 3130 * content in this view is visible. 3131 * 3132 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3133 * faded edges are not enabled for this view. 3134 * @attr ref android.R.styleable#View_fadingEdgeLength 3135 */ 3136 public int getHorizontalFadingEdgeLength() { 3137 if (isHorizontalFadingEdgeEnabled()) { 3138 ScrollabilityCache cache = mScrollCache; 3139 if (cache != null) { 3140 return cache.fadingEdgeLength; 3141 } 3142 } 3143 return 0; 3144 } 3145 3146 /** 3147 * Returns the width of the vertical scrollbar. 3148 * 3149 * @return The width in pixels of the vertical scrollbar or 0 if there 3150 * is no vertical scrollbar. 3151 */ 3152 public int getVerticalScrollbarWidth() { 3153 ScrollabilityCache cache = mScrollCache; 3154 if (cache != null) { 3155 ScrollBarDrawable scrollBar = cache.scrollBar; 3156 if (scrollBar != null) { 3157 int size = scrollBar.getSize(true); 3158 if (size <= 0) { 3159 size = cache.scrollBarSize; 3160 } 3161 return size; 3162 } 3163 return 0; 3164 } 3165 return 0; 3166 } 3167 3168 /** 3169 * Returns the height of the horizontal scrollbar. 3170 * 3171 * @return The height in pixels of the horizontal scrollbar or 0 if 3172 * there is no horizontal scrollbar. 3173 */ 3174 protected int getHorizontalScrollbarHeight() { 3175 ScrollabilityCache cache = mScrollCache; 3176 if (cache != null) { 3177 ScrollBarDrawable scrollBar = cache.scrollBar; 3178 if (scrollBar != null) { 3179 int size = scrollBar.getSize(false); 3180 if (size <= 0) { 3181 size = cache.scrollBarSize; 3182 } 3183 return size; 3184 } 3185 return 0; 3186 } 3187 return 0; 3188 } 3189 3190 /** 3191 * <p> 3192 * Initializes the scrollbars from a given set of styled attributes. This 3193 * method should be called by subclasses that need scrollbars and when an 3194 * instance of these subclasses is created programmatically rather than 3195 * being inflated from XML. This method is automatically called when the XML 3196 * is inflated. 3197 * </p> 3198 * 3199 * @param a the styled attributes set to initialize the scrollbars from 3200 */ 3201 protected void initializeScrollbars(TypedArray a) { 3202 initScrollCache(); 3203 3204 final ScrollabilityCache scrollabilityCache = mScrollCache; 3205 3206 if (scrollabilityCache.scrollBar == null) { 3207 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3208 } 3209 3210 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3211 3212 if (!fadeScrollbars) { 3213 scrollabilityCache.state = ScrollabilityCache.ON; 3214 } 3215 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3216 3217 3218 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3219 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3220 .getScrollBarFadeDuration()); 3221 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3222 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3223 ViewConfiguration.getScrollDefaultDelay()); 3224 3225 3226 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3227 com.android.internal.R.styleable.View_scrollbarSize, 3228 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3229 3230 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3231 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3232 3233 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3234 if (thumb != null) { 3235 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3236 } 3237 3238 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3239 false); 3240 if (alwaysDraw) { 3241 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3242 } 3243 3244 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3245 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3246 3247 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3248 if (thumb != null) { 3249 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3250 } 3251 3252 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3253 false); 3254 if (alwaysDraw) { 3255 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3256 } 3257 3258 // Re-apply user/background padding so that scrollbar(s) get added 3259 resolvePadding(); 3260 } 3261 3262 /** 3263 * <p> 3264 * Initalizes the scrollability cache if necessary. 3265 * </p> 3266 */ 3267 private void initScrollCache() { 3268 if (mScrollCache == null) { 3269 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3270 } 3271 } 3272 3273 /** 3274 * Set the position of the vertical scroll bar. Should be one of 3275 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3276 * {@link #SCROLLBAR_POSITION_RIGHT}. 3277 * 3278 * @param position Where the vertical scroll bar should be positioned. 3279 */ 3280 public void setVerticalScrollbarPosition(int position) { 3281 if (mVerticalScrollbarPosition != position) { 3282 mVerticalScrollbarPosition = position; 3283 computeOpaqueFlags(); 3284 resolvePadding(); 3285 } 3286 } 3287 3288 /** 3289 * @return The position where the vertical scroll bar will show, if applicable. 3290 * @see #setVerticalScrollbarPosition(int) 3291 */ 3292 public int getVerticalScrollbarPosition() { 3293 return mVerticalScrollbarPosition; 3294 } 3295 3296 /** 3297 * Register a callback to be invoked when focus of this view changed. 3298 * 3299 * @param l The callback that will run. 3300 */ 3301 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3302 mOnFocusChangeListener = l; 3303 } 3304 3305 /** 3306 * Add a listener that will be called when the bounds of the view change due to 3307 * layout processing. 3308 * 3309 * @param listener The listener that will be called when layout bounds change. 3310 */ 3311 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3312 if (mOnLayoutChangeListeners == null) { 3313 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3314 } 3315 mOnLayoutChangeListeners.add(listener); 3316 } 3317 3318 /** 3319 * Remove a listener for layout changes. 3320 * 3321 * @param listener The listener for layout bounds change. 3322 */ 3323 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3324 if (mOnLayoutChangeListeners == null) { 3325 return; 3326 } 3327 mOnLayoutChangeListeners.remove(listener); 3328 } 3329 3330 /** 3331 * Add a listener for attach state changes. 3332 * 3333 * This listener will be called whenever this view is attached or detached 3334 * from a window. Remove the listener using 3335 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3336 * 3337 * @param listener Listener to attach 3338 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3339 */ 3340 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3341 if (mOnAttachStateChangeListeners == null) { 3342 mOnAttachStateChangeListeners = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3343 } 3344 mOnAttachStateChangeListeners.add(listener); 3345 } 3346 3347 /** 3348 * Remove a listener for attach state changes. The listener will receive no further 3349 * notification of window attach/detach events. 3350 * 3351 * @param listener Listener to remove 3352 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3353 */ 3354 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3355 if (mOnAttachStateChangeListeners == null) { 3356 return; 3357 } 3358 mOnAttachStateChangeListeners.remove(listener); 3359 } 3360 3361 /** 3362 * Returns the focus-change callback registered for this view. 3363 * 3364 * @return The callback, or null if one is not registered. 3365 */ 3366 public OnFocusChangeListener getOnFocusChangeListener() { 3367 return mOnFocusChangeListener; 3368 } 3369 3370 /** 3371 * Register a callback to be invoked when this view is clicked. If this view is not 3372 * clickable, it becomes clickable. 3373 * 3374 * @param l The callback that will run 3375 * 3376 * @see #setClickable(boolean) 3377 */ 3378 public void setOnClickListener(OnClickListener l) { 3379 if (!isClickable()) { 3380 setClickable(true); 3381 } 3382 mOnClickListener = l; 3383 } 3384 3385 /** 3386 * Register a callback to be invoked when this view is clicked and held. If this view is not 3387 * long clickable, it becomes long clickable. 3388 * 3389 * @param l The callback that will run 3390 * 3391 * @see #setLongClickable(boolean) 3392 */ 3393 public void setOnLongClickListener(OnLongClickListener l) { 3394 if (!isLongClickable()) { 3395 setLongClickable(true); 3396 } 3397 mOnLongClickListener = l; 3398 } 3399 3400 /** 3401 * Register a callback to be invoked when the context menu for this view is 3402 * being built. If this view is not long clickable, it becomes long clickable. 3403 * 3404 * @param l The callback that will run 3405 * 3406 */ 3407 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3408 if (!isLongClickable()) { 3409 setLongClickable(true); 3410 } 3411 mOnCreateContextMenuListener = l; 3412 } 3413 3414 /** 3415 * Call this view's OnClickListener, if it is defined. 3416 * 3417 * @return True there was an assigned OnClickListener that was called, false 3418 * otherwise is returned. 3419 */ 3420 public boolean performClick() { 3421 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3422 3423 if (mOnClickListener != null) { 3424 playSoundEffect(SoundEffectConstants.CLICK); 3425 mOnClickListener.onClick(this); 3426 return true; 3427 } 3428 3429 return false; 3430 } 3431 3432 /** 3433 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3434 * OnLongClickListener did not consume the event. 3435 * 3436 * @return True if one of the above receivers consumed the event, false otherwise. 3437 */ 3438 public boolean performLongClick() { 3439 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3440 3441 boolean handled = false; 3442 if (mOnLongClickListener != null) { 3443 handled = mOnLongClickListener.onLongClick(View.this); 3444 } 3445 if (!handled) { 3446 handled = showContextMenu(); 3447 } 3448 if (handled) { 3449 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3450 } 3451 return handled; 3452 } 3453 3454 /** 3455 * Performs button-related actions during a touch down event. 3456 * 3457 * @param event The event. 3458 * @return True if the down was consumed. 3459 * 3460 * @hide 3461 */ 3462 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3463 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3464 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3465 return true; 3466 } 3467 } 3468 return false; 3469 } 3470 3471 /** 3472 * Bring up the context menu for this view. 3473 * 3474 * @return Whether a context menu was displayed. 3475 */ 3476 public boolean showContextMenu() { 3477 return getParent().showContextMenuForChild(this); 3478 } 3479 3480 /** 3481 * Bring up the context menu for this view, referring to the item under the specified point. 3482 * 3483 * @param x The referenced x coordinate. 3484 * @param y The referenced y coordinate. 3485 * @param metaState The keyboard modifiers that were pressed. 3486 * @return Whether a context menu was displayed. 3487 * 3488 * @hide 3489 */ 3490 public boolean showContextMenu(float x, float y, int metaState) { 3491 return showContextMenu(); 3492 } 3493 3494 /** 3495 * Start an action mode. 3496 * 3497 * @param callback Callback that will control the lifecycle of the action mode 3498 * @return The new action mode if it is started, null otherwise 3499 * 3500 * @see ActionMode 3501 */ 3502 public ActionMode startActionMode(ActionMode.Callback callback) { 3503 return getParent().startActionModeForChild(this, callback); 3504 } 3505 3506 /** 3507 * Register a callback to be invoked when a key is pressed in this view. 3508 * @param l the key listener to attach to this view 3509 */ 3510 public void setOnKeyListener(OnKeyListener l) { 3511 mOnKeyListener = l; 3512 } 3513 3514 /** 3515 * Register a callback to be invoked when a touch event is sent to this view. 3516 * @param l the touch listener to attach to this view 3517 */ 3518 public void setOnTouchListener(OnTouchListener l) { 3519 mOnTouchListener = l; 3520 } 3521 3522 /** 3523 * Register a callback to be invoked when a generic motion event is sent to this view. 3524 * @param l the generic motion listener to attach to this view 3525 */ 3526 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3527 mOnGenericMotionListener = l; 3528 } 3529 3530 /** 3531 * Register a callback to be invoked when a hover event is sent to this view. 3532 * @param l the hover listener to attach to this view 3533 */ 3534 public void setOnHoverListener(OnHoverListener l) { 3535 mOnHoverListener = l; 3536 } 3537 3538 /** 3539 * Register a drag event listener callback object for this View. The parameter is 3540 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3541 * View, the system calls the 3542 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3543 * @param l An implementation of {@link android.view.View.OnDragListener}. 3544 */ 3545 public void setOnDragListener(OnDragListener l) { 3546 mOnDragListener = l; 3547 } 3548 3549 /** 3550 * Give this view focus. This will cause 3551 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3552 * 3553 * Note: this does not check whether this {@link View} should get focus, it just 3554 * gives it focus no matter what. It should only be called internally by framework 3555 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3556 * 3557 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3558 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3559 * focus moved when requestFocus() is called. It may not always 3560 * apply, in which case use the default View.FOCUS_DOWN. 3561 * @param previouslyFocusedRect The rectangle of the view that had focus 3562 * prior in this View's coordinate system. 3563 */ 3564 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3565 if (DBG) { 3566 System.out.println(this + " requestFocus()"); 3567 } 3568 3569 if ((mPrivateFlags & FOCUSED) == 0) { 3570 mPrivateFlags |= FOCUSED; 3571 3572 if (mParent != null) { 3573 mParent.requestChildFocus(this, this); 3574 } 3575 3576 onFocusChanged(true, direction, previouslyFocusedRect); 3577 refreshDrawableState(); 3578 } 3579 } 3580 3581 /** 3582 * Request that a rectangle of this view be visible on the screen, 3583 * scrolling if necessary just enough. 3584 * 3585 * <p>A View should call this if it maintains some notion of which part 3586 * of its content is interesting. For example, a text editing view 3587 * should call this when its cursor moves. 3588 * 3589 * @param rectangle The rectangle. 3590 * @return Whether any parent scrolled. 3591 */ 3592 public boolean requestRectangleOnScreen(Rect rectangle) { 3593 return requestRectangleOnScreen(rectangle, false); 3594 } 3595 3596 /** 3597 * Request that a rectangle of this view be visible on the screen, 3598 * scrolling if necessary just enough. 3599 * 3600 * <p>A View should call this if it maintains some notion of which part 3601 * of its content is interesting. For example, a text editing view 3602 * should call this when its cursor moves. 3603 * 3604 * <p>When <code>immediate</code> is set to true, scrolling will not be 3605 * animated. 3606 * 3607 * @param rectangle The rectangle. 3608 * @param immediate True to forbid animated scrolling, false otherwise 3609 * @return Whether any parent scrolled. 3610 */ 3611 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3612 View child = this; 3613 ViewParent parent = mParent; 3614 boolean scrolled = false; 3615 while (parent != null) { 3616 scrolled |= parent.requestChildRectangleOnScreen(child, 3617 rectangle, immediate); 3618 3619 // offset rect so next call has the rectangle in the 3620 // coordinate system of its direct child. 3621 rectangle.offset(child.getLeft(), child.getTop()); 3622 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3623 3624 if (!(parent instanceof View)) { 3625 break; 3626 } 3627 3628 child = (View) parent; 3629 parent = child.getParent(); 3630 } 3631 return scrolled; 3632 } 3633 3634 /** 3635 * Called when this view wants to give up focus. This will cause 3636 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3637 */ 3638 public void clearFocus() { 3639 if (DBG) { 3640 System.out.println(this + " clearFocus()"); 3641 } 3642 3643 if ((mPrivateFlags & FOCUSED) != 0) { 3644 mPrivateFlags &= ~FOCUSED; 3645 3646 if (mParent != null) { 3647 mParent.clearChildFocus(this); 3648 } 3649 3650 onFocusChanged(false, 0, null); 3651 refreshDrawableState(); 3652 } 3653 } 3654 3655 /** 3656 * Called to clear the focus of a view that is about to be removed. 3657 * Doesn't call clearChildFocus, which prevents this view from taking 3658 * focus again before it has been removed from the parent 3659 */ 3660 void clearFocusForRemoval() { 3661 if ((mPrivateFlags & FOCUSED) != 0) { 3662 mPrivateFlags &= ~FOCUSED; 3663 3664 onFocusChanged(false, 0, null); 3665 refreshDrawableState(); 3666 } 3667 } 3668 3669 /** 3670 * Called internally by the view system when a new view is getting focus. 3671 * This is what clears the old focus. 3672 */ 3673 void unFocus() { 3674 if (DBG) { 3675 System.out.println(this + " unFocus()"); 3676 } 3677 3678 if ((mPrivateFlags & FOCUSED) != 0) { 3679 mPrivateFlags &= ~FOCUSED; 3680 3681 onFocusChanged(false, 0, null); 3682 refreshDrawableState(); 3683 } 3684 } 3685 3686 /** 3687 * Returns true if this view has focus iteself, or is the ancestor of the 3688 * view that has focus. 3689 * 3690 * @return True if this view has or contains focus, false otherwise. 3691 */ 3692 @ViewDebug.ExportedProperty(category = "focus") 3693 public boolean hasFocus() { 3694 return (mPrivateFlags & FOCUSED) != 0; 3695 } 3696 3697 /** 3698 * Returns true if this view is focusable or if it contains a reachable View 3699 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3700 * is a View whose parents do not block descendants focus. 3701 * 3702 * Only {@link #VISIBLE} views are considered focusable. 3703 * 3704 * @return True if the view is focusable or if the view contains a focusable 3705 * View, false otherwise. 3706 * 3707 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3708 */ 3709 public boolean hasFocusable() { 3710 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3711 } 3712 3713 /** 3714 * Called by the view system when the focus state of this view changes. 3715 * When the focus change event is caused by directional navigation, direction 3716 * and previouslyFocusedRect provide insight into where the focus is coming from. 3717 * When overriding, be sure to call up through to the super class so that 3718 * the standard focus handling will occur. 3719 * 3720 * @param gainFocus True if the View has focus; false otherwise. 3721 * @param direction The direction focus has moved when requestFocus() 3722 * is called to give this view focus. Values are 3723 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3724 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3725 * It may not always apply, in which case use the default. 3726 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3727 * system, of the previously focused view. If applicable, this will be 3728 * passed in as finer grained information about where the focus is coming 3729 * from (in addition to direction). Will be <code>null</code> otherwise. 3730 */ 3731 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3732 if (gainFocus) { 3733 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3734 } 3735 3736 InputMethodManager imm = InputMethodManager.peekInstance(); 3737 if (!gainFocus) { 3738 if (isPressed()) { 3739 setPressed(false); 3740 } 3741 if (imm != null && mAttachInfo != null 3742 && mAttachInfo.mHasWindowFocus) { 3743 imm.focusOut(this); 3744 } 3745 onFocusLost(); 3746 } else if (imm != null && mAttachInfo != null 3747 && mAttachInfo.mHasWindowFocus) { 3748 imm.focusIn(this); 3749 } 3750 3751 invalidate(true); 3752 if (mOnFocusChangeListener != null) { 3753 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3754 } 3755 3756 if (mAttachInfo != null) { 3757 mAttachInfo.mKeyDispatchState.reset(this); 3758 } 3759 } 3760 3761 /** 3762 * Sends an accessibility event of the given type. If accessiiblity is 3763 * not enabled this method has no effect. The default implementation calls 3764 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3765 * to populate information about the event source (this View), then calls 3766 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3767 * populate the text content of the event source including its descendants, 3768 * and last calls 3769 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3770 * on its parent to resuest sending of the event to interested parties. 3771 * 3772 * @param eventType The type of the event to send. 3773 * 3774 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3775 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3776 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3777 */ 3778 public void sendAccessibilityEvent(int eventType) { 3779 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3780 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3781 } 3782 } 3783 3784 /** 3785 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3786 * takes as an argument an empty {@link AccessibilityEvent} and does not 3787 * perfrom a check whether accessibility is enabled. 3788 * 3789 * @param event The event to send. 3790 * 3791 * @see #sendAccessibilityEvent(int) 3792 */ 3793 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3794 if (!isShown()) { 3795 return; 3796 } 3797 onInitializeAccessibilityEvent(event); 3798 dispatchPopulateAccessibilityEvent(event); 3799 // In the beginning we called #isShown(), so we know that getParent() is not null. 3800 getParent().requestSendAccessibilityEvent(this, event); 3801 } 3802 3803 /** 3804 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 3805 * to its children for adding their text content to the event. Note that the 3806 * event text is populated in a separate dispatch path since we add to the 3807 * event not only the text of the source but also the text of all its descendants. 3808 * </p> 3809 * A typical implementation will call 3810 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 3811 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3812 * on each child. Override this method if custom population of the event text 3813 * content is required. 3814 * 3815 * @param event The event. 3816 * 3817 * @return True if the event population was completed. 3818 */ 3819 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3820 onPopulateAccessibilityEvent(event); 3821 return false; 3822 } 3823 3824 /** 3825 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3826 * giving a chance to this View to populate the accessibility event with its 3827 * text content. While the implementation is free to modify other event 3828 * attributes this should be performed in 3829 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 3830 * <p> 3831 * Example: Adding formatted date string to an accessibility event in addition 3832 * to the text added by the super implementation. 3833 * </p><p><pre><code> 3834 * public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3835 * super.onPopulateAccessibilityEvent(event); 3836 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 3837 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 3838 * mCurrentDate.getTimeInMillis(), flags); 3839 * event.getText().add(selectedDateUtterance); 3840 * } 3841 * </code></pre></p> 3842 * 3843 * @param event The accessibility event which to populate. 3844 * 3845 * @see #sendAccessibilityEvent(int) 3846 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3847 */ 3848 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3849 } 3850 3851 /** 3852 * Initializes an {@link AccessibilityEvent} with information about the 3853 * the type of the event and this View which is the event source. In other 3854 * words, the source of an accessibility event is the view whose state 3855 * change triggered firing the event. 3856 * <p> 3857 * Example: Setting the password property of an event in addition 3858 * to properties set by the super implementation. 3859 * </p><p><pre><code> 3860 * public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3861 * super.onInitializeAccessibilityEvent(event); 3862 * event.setPassword(true); 3863 * } 3864 * </code></pre></p> 3865 * @param event The event to initialeze. 3866 * 3867 * @see #sendAccessibilityEvent(int) 3868 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3869 */ 3870 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3871 event.setSource(this); 3872 event.setClassName(getClass().getName()); 3873 event.setPackageName(getContext().getPackageName()); 3874 event.setEnabled(isEnabled()); 3875 event.setContentDescription(mContentDescription); 3876 3877 final int eventType = event.getEventType(); 3878 switch (eventType) { 3879 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 3880 if (mAttachInfo != null) { 3881 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3882 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 3883 FOCUSABLES_ALL); 3884 event.setItemCount(focusablesTempList.size()); 3885 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3886 focusablesTempList.clear(); 3887 } 3888 } break; 3889 case AccessibilityEvent.TYPE_VIEW_SCROLLED: { 3890 event.setScrollX(mScrollX); 3891 event.setScrollY(mScrollY); 3892 event.setItemCount(getHeight()); 3893 } break; 3894 } 3895 } 3896 3897 /** 3898 * Returns an {@link AccessibilityNodeInfo} representing this view from the 3899 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 3900 * This method is responsible for obtaining an accessibility node info from a 3901 * pool of reusable instances and calling 3902 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 3903 * initialize the former. 3904 * <p> 3905 * Note: The client is responsible for recycling the obtained instance by calling 3906 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 3907 * </p> 3908 * @return A populated {@link AccessibilityNodeInfo}. 3909 * 3910 * @see AccessibilityNodeInfo 3911 */ 3912 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 3913 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 3914 onInitializeAccessibilityNodeInfo(info); 3915 return info; 3916 } 3917 3918 /** 3919 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 3920 * The base implementation sets: 3921 * <ul> 3922 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 3923 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 3924 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 3925 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 3926 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 3927 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 3928 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 3929 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 3930 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 3931 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 3932 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 3933 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 3934 * </ul> 3935 * <p> 3936 * Subclasses should override this method, call the super implementation, 3937 * and set additional attributes. 3938 * </p> 3939 * @param info The instance to initialize. 3940 */ 3941 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 3942 Rect bounds = mAttachInfo.mTmpInvalRect; 3943 getDrawingRect(bounds); 3944 info.setBoundsInParent(bounds); 3945 3946 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 3947 getLocationOnScreen(locationOnScreen); 3948 bounds.offsetTo(0, 0); 3949 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 3950 info.setBoundsInScreen(bounds); 3951 3952 ViewParent parent = getParent(); 3953 if (parent instanceof View) { 3954 View parentView = (View) parent; 3955 info.setParent(parentView); 3956 } 3957 3958 info.setPackageName(mContext.getPackageName()); 3959 info.setClassName(getClass().getName()); 3960 info.setContentDescription(getContentDescription()); 3961 3962 info.setEnabled(isEnabled()); 3963 info.setClickable(isClickable()); 3964 info.setFocusable(isFocusable()); 3965 info.setFocused(isFocused()); 3966 info.setSelected(isSelected()); 3967 info.setLongClickable(isLongClickable()); 3968 3969 // TODO: These make sense only if we are in an AdapterView but all 3970 // views can be selected. Maybe from accessiiblity perspective 3971 // we should report as selectable view in an AdapterView. 3972 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 3973 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 3974 3975 if (isFocusable()) { 3976 if (isFocused()) { 3977 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 3978 } else { 3979 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 3980 } 3981 } 3982 } 3983 3984 /** 3985 * Gets the unique identifier of this view on the screen for accessibility purposes. 3986 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 3987 * 3988 * @return The view accessibility id. 3989 * 3990 * @hide 3991 */ 3992 public int getAccessibilityViewId() { 3993 if (mAccessibilityViewId == NO_ID) { 3994 mAccessibilityViewId = sNextAccessibilityViewId++; 3995 } 3996 return mAccessibilityViewId; 3997 } 3998 3999 /** 4000 * Gets the unique identifier of the window in which this View reseides. 4001 * 4002 * @return The window accessibility id. 4003 * 4004 * @hide 4005 */ 4006 public int getAccessibilityWindowId() { 4007 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4008 } 4009 4010 /** 4011 * Gets the {@link View} description. It briefly describes the view and is 4012 * primarily used for accessibility support. Set this property to enable 4013 * better accessibility support for your application. This is especially 4014 * true for views that do not have textual representation (For example, 4015 * ImageButton). 4016 * 4017 * @return The content descriptiopn. 4018 * 4019 * @attr ref android.R.styleable#View_contentDescription 4020 */ 4021 public CharSequence getContentDescription() { 4022 return mContentDescription; 4023 } 4024 4025 /** 4026 * Sets the {@link View} description. It briefly describes the view and is 4027 * primarily used for accessibility support. Set this property to enable 4028 * better accessibility support for your application. This is especially 4029 * true for views that do not have textual representation (For example, 4030 * ImageButton). 4031 * 4032 * @param contentDescription The content description. 4033 * 4034 * @attr ref android.R.styleable#View_contentDescription 4035 */ 4036 public void setContentDescription(CharSequence contentDescription) { 4037 mContentDescription = contentDescription; 4038 } 4039 4040 /** 4041 * Invoked whenever this view loses focus, either by losing window focus or by losing 4042 * focus within its window. This method can be used to clear any state tied to the 4043 * focus. For instance, if a button is held pressed with the trackball and the window 4044 * loses focus, this method can be used to cancel the press. 4045 * 4046 * Subclasses of View overriding this method should always call super.onFocusLost(). 4047 * 4048 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4049 * @see #onWindowFocusChanged(boolean) 4050 * 4051 * @hide pending API council approval 4052 */ 4053 protected void onFocusLost() { 4054 resetPressedState(); 4055 } 4056 4057 private void resetPressedState() { 4058 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4059 return; 4060 } 4061 4062 if (isPressed()) { 4063 setPressed(false); 4064 4065 if (!mHasPerformedLongPress) { 4066 removeLongPressCallback(); 4067 } 4068 } 4069 } 4070 4071 /** 4072 * Returns true if this view has focus 4073 * 4074 * @return True if this view has focus, false otherwise. 4075 */ 4076 @ViewDebug.ExportedProperty(category = "focus") 4077 public boolean isFocused() { 4078 return (mPrivateFlags & FOCUSED) != 0; 4079 } 4080 4081 /** 4082 * Find the view in the hierarchy rooted at this view that currently has 4083 * focus. 4084 * 4085 * @return The view that currently has focus, or null if no focused view can 4086 * be found. 4087 */ 4088 public View findFocus() { 4089 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4090 } 4091 4092 /** 4093 * Change whether this view is one of the set of scrollable containers in 4094 * its window. This will be used to determine whether the window can 4095 * resize or must pan when a soft input area is open -- scrollable 4096 * containers allow the window to use resize mode since the container 4097 * will appropriately shrink. 4098 */ 4099 public void setScrollContainer(boolean isScrollContainer) { 4100 if (isScrollContainer) { 4101 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4102 mAttachInfo.mScrollContainers.add(this); 4103 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4104 } 4105 mPrivateFlags |= SCROLL_CONTAINER; 4106 } else { 4107 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4108 mAttachInfo.mScrollContainers.remove(this); 4109 } 4110 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4111 } 4112 } 4113 4114 /** 4115 * Returns the quality of the drawing cache. 4116 * 4117 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4118 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4119 * 4120 * @see #setDrawingCacheQuality(int) 4121 * @see #setDrawingCacheEnabled(boolean) 4122 * @see #isDrawingCacheEnabled() 4123 * 4124 * @attr ref android.R.styleable#View_drawingCacheQuality 4125 */ 4126 public int getDrawingCacheQuality() { 4127 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4128 } 4129 4130 /** 4131 * Set the drawing cache quality of this view. This value is used only when the 4132 * drawing cache is enabled 4133 * 4134 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4135 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4136 * 4137 * @see #getDrawingCacheQuality() 4138 * @see #setDrawingCacheEnabled(boolean) 4139 * @see #isDrawingCacheEnabled() 4140 * 4141 * @attr ref android.R.styleable#View_drawingCacheQuality 4142 */ 4143 public void setDrawingCacheQuality(int quality) { 4144 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4145 } 4146 4147 /** 4148 * Returns whether the screen should remain on, corresponding to the current 4149 * value of {@link #KEEP_SCREEN_ON}. 4150 * 4151 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4152 * 4153 * @see #setKeepScreenOn(boolean) 4154 * 4155 * @attr ref android.R.styleable#View_keepScreenOn 4156 */ 4157 public boolean getKeepScreenOn() { 4158 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4159 } 4160 4161 /** 4162 * Controls whether the screen should remain on, modifying the 4163 * value of {@link #KEEP_SCREEN_ON}. 4164 * 4165 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4166 * 4167 * @see #getKeepScreenOn() 4168 * 4169 * @attr ref android.R.styleable#View_keepScreenOn 4170 */ 4171 public void setKeepScreenOn(boolean keepScreenOn) { 4172 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4173 } 4174 4175 /** 4176 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4177 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4178 * 4179 * @attr ref android.R.styleable#View_nextFocusLeft 4180 */ 4181 public int getNextFocusLeftId() { 4182 return mNextFocusLeftId; 4183 } 4184 4185 /** 4186 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4187 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4188 * decide automatically. 4189 * 4190 * @attr ref android.R.styleable#View_nextFocusLeft 4191 */ 4192 public void setNextFocusLeftId(int nextFocusLeftId) { 4193 mNextFocusLeftId = nextFocusLeftId; 4194 } 4195 4196 /** 4197 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4198 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4199 * 4200 * @attr ref android.R.styleable#View_nextFocusRight 4201 */ 4202 public int getNextFocusRightId() { 4203 return mNextFocusRightId; 4204 } 4205 4206 /** 4207 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4208 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4209 * decide automatically. 4210 * 4211 * @attr ref android.R.styleable#View_nextFocusRight 4212 */ 4213 public void setNextFocusRightId(int nextFocusRightId) { 4214 mNextFocusRightId = nextFocusRightId; 4215 } 4216 4217 /** 4218 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4219 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4220 * 4221 * @attr ref android.R.styleable#View_nextFocusUp 4222 */ 4223 public int getNextFocusUpId() { 4224 return mNextFocusUpId; 4225 } 4226 4227 /** 4228 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4229 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4230 * decide automatically. 4231 * 4232 * @attr ref android.R.styleable#View_nextFocusUp 4233 */ 4234 public void setNextFocusUpId(int nextFocusUpId) { 4235 mNextFocusUpId = nextFocusUpId; 4236 } 4237 4238 /** 4239 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4240 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4241 * 4242 * @attr ref android.R.styleable#View_nextFocusDown 4243 */ 4244 public int getNextFocusDownId() { 4245 return mNextFocusDownId; 4246 } 4247 4248 /** 4249 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4250 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4251 * decide automatically. 4252 * 4253 * @attr ref android.R.styleable#View_nextFocusDown 4254 */ 4255 public void setNextFocusDownId(int nextFocusDownId) { 4256 mNextFocusDownId = nextFocusDownId; 4257 } 4258 4259 /** 4260 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4261 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4262 * 4263 * @attr ref android.R.styleable#View_nextFocusForward 4264 */ 4265 public int getNextFocusForwardId() { 4266 return mNextFocusForwardId; 4267 } 4268 4269 /** 4270 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4271 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4272 * decide automatically. 4273 * 4274 * @attr ref android.R.styleable#View_nextFocusForward 4275 */ 4276 public void setNextFocusForwardId(int nextFocusForwardId) { 4277 mNextFocusForwardId = nextFocusForwardId; 4278 } 4279 4280 /** 4281 * Returns the visibility of this view and all of its ancestors 4282 * 4283 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4284 */ 4285 public boolean isShown() { 4286 View current = this; 4287 //noinspection ConstantConditions 4288 do { 4289 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4290 return false; 4291 } 4292 ViewParent parent = current.mParent; 4293 if (parent == null) { 4294 return false; // We are not attached to the view root 4295 } 4296 if (!(parent instanceof View)) { 4297 return true; 4298 } 4299 current = (View) parent; 4300 } while (current != null); 4301 4302 return false; 4303 } 4304 4305 /** 4306 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4307 * is set 4308 * 4309 * @param insets Insets for system windows 4310 * 4311 * @return True if this view applied the insets, false otherwise 4312 */ 4313 protected boolean fitSystemWindows(Rect insets) { 4314 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4315 mPaddingLeft = insets.left; 4316 mPaddingTop = insets.top; 4317 mPaddingRight = insets.right; 4318 mPaddingBottom = insets.bottom; 4319 requestLayout(); 4320 return true; 4321 } 4322 return false; 4323 } 4324 4325 /** 4326 * Set whether or not this view should account for system screen decorations 4327 * such as the status bar and inset its content. This allows this view to be 4328 * positioned in absolute screen coordinates and remain visible to the user. 4329 * 4330 * <p>This should only be used by top-level window decor views. 4331 * 4332 * @param fitSystemWindows true to inset content for system screen decorations, false for 4333 * default behavior. 4334 * 4335 * @attr ref android.R.styleable#View_fitsSystemWindows 4336 */ 4337 public void setFitsSystemWindows(boolean fitSystemWindows) { 4338 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 4339 } 4340 4341 /** 4342 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 4343 * will account for system screen decorations such as the status bar and inset its 4344 * content. This allows the view to be positioned in absolute screen coordinates 4345 * and remain visible to the user. 4346 * 4347 * @return true if this view will adjust its content bounds for system screen decorations. 4348 * 4349 * @attr ref android.R.styleable#View_fitsSystemWindows 4350 */ 4351 public boolean fitsSystemWindows() { 4352 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 4353 } 4354 4355 /** 4356 * Returns the visibility status for this view. 4357 * 4358 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4359 * @attr ref android.R.styleable#View_visibility 4360 */ 4361 @ViewDebug.ExportedProperty(mapping = { 4362 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4363 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4364 @ViewDebug.IntToString(from = GONE, to = "GONE") 4365 }) 4366 public int getVisibility() { 4367 return mViewFlags & VISIBILITY_MASK; 4368 } 4369 4370 /** 4371 * Set the enabled state of this view. 4372 * 4373 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4374 * @attr ref android.R.styleable#View_visibility 4375 */ 4376 @RemotableViewMethod 4377 public void setVisibility(int visibility) { 4378 setFlags(visibility, VISIBILITY_MASK); 4379 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4380 } 4381 4382 /** 4383 * Returns the enabled status for this view. The interpretation of the 4384 * enabled state varies by subclass. 4385 * 4386 * @return True if this view is enabled, false otherwise. 4387 */ 4388 @ViewDebug.ExportedProperty 4389 public boolean isEnabled() { 4390 return (mViewFlags & ENABLED_MASK) == ENABLED; 4391 } 4392 4393 /** 4394 * Set the enabled state of this view. The interpretation of the enabled 4395 * state varies by subclass. 4396 * 4397 * @param enabled True if this view is enabled, false otherwise. 4398 */ 4399 @RemotableViewMethod 4400 public void setEnabled(boolean enabled) { 4401 if (enabled == isEnabled()) return; 4402 4403 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4404 4405 /* 4406 * The View most likely has to change its appearance, so refresh 4407 * the drawable state. 4408 */ 4409 refreshDrawableState(); 4410 4411 // Invalidate too, since the default behavior for views is to be 4412 // be drawn at 50% alpha rather than to change the drawable. 4413 invalidate(true); 4414 } 4415 4416 /** 4417 * Set whether this view can receive the focus. 4418 * 4419 * Setting this to false will also ensure that this view is not focusable 4420 * in touch mode. 4421 * 4422 * @param focusable If true, this view can receive the focus. 4423 * 4424 * @see #setFocusableInTouchMode(boolean) 4425 * @attr ref android.R.styleable#View_focusable 4426 */ 4427 public void setFocusable(boolean focusable) { 4428 if (!focusable) { 4429 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4430 } 4431 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4432 } 4433 4434 /** 4435 * Set whether this view can receive focus while in touch mode. 4436 * 4437 * Setting this to true will also ensure that this view is focusable. 4438 * 4439 * @param focusableInTouchMode If true, this view can receive the focus while 4440 * in touch mode. 4441 * 4442 * @see #setFocusable(boolean) 4443 * @attr ref android.R.styleable#View_focusableInTouchMode 4444 */ 4445 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4446 // Focusable in touch mode should always be set before the focusable flag 4447 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4448 // which, in touch mode, will not successfully request focus on this view 4449 // because the focusable in touch mode flag is not set 4450 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4451 if (focusableInTouchMode) { 4452 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4453 } 4454 } 4455 4456 /** 4457 * Set whether this view should have sound effects enabled for events such as 4458 * clicking and touching. 4459 * 4460 * <p>You may wish to disable sound effects for a view if you already play sounds, 4461 * for instance, a dial key that plays dtmf tones. 4462 * 4463 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4464 * @see #isSoundEffectsEnabled() 4465 * @see #playSoundEffect(int) 4466 * @attr ref android.R.styleable#View_soundEffectsEnabled 4467 */ 4468 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4469 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4470 } 4471 4472 /** 4473 * @return whether this view should have sound effects enabled for events such as 4474 * clicking and touching. 4475 * 4476 * @see #setSoundEffectsEnabled(boolean) 4477 * @see #playSoundEffect(int) 4478 * @attr ref android.R.styleable#View_soundEffectsEnabled 4479 */ 4480 @ViewDebug.ExportedProperty 4481 public boolean isSoundEffectsEnabled() { 4482 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4483 } 4484 4485 /** 4486 * Set whether this view should have haptic feedback for events such as 4487 * long presses. 4488 * 4489 * <p>You may wish to disable haptic feedback if your view already controls 4490 * its own haptic feedback. 4491 * 4492 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4493 * @see #isHapticFeedbackEnabled() 4494 * @see #performHapticFeedback(int) 4495 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4496 */ 4497 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4498 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4499 } 4500 4501 /** 4502 * @return whether this view should have haptic feedback enabled for events 4503 * long presses. 4504 * 4505 * @see #setHapticFeedbackEnabled(boolean) 4506 * @see #performHapticFeedback(int) 4507 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4508 */ 4509 @ViewDebug.ExportedProperty 4510 public boolean isHapticFeedbackEnabled() { 4511 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4512 } 4513 4514 /** 4515 * Returns the layout direction for this view. 4516 * 4517 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4518 * {@link #LAYOUT_DIRECTION_RTL}, 4519 * {@link #LAYOUT_DIRECTION_INHERIT} or 4520 * {@link #LAYOUT_DIRECTION_LOCALE}. 4521 * @attr ref android.R.styleable#View_layoutDirection 4522 * 4523 * @hide 4524 */ 4525 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4526 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4527 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4528 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4529 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4530 }) 4531 public int getLayoutDirection() { 4532 return mViewFlags & LAYOUT_DIRECTION_MASK; 4533 } 4534 4535 /** 4536 * Set the layout direction for this view. This will propagate a reset of layout direction 4537 * resolution to the view's children and resolve layout direction for this view. 4538 * 4539 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4540 * {@link #LAYOUT_DIRECTION_RTL}, 4541 * {@link #LAYOUT_DIRECTION_INHERIT} or 4542 * {@link #LAYOUT_DIRECTION_LOCALE}. 4543 * 4544 * @attr ref android.R.styleable#View_layoutDirection 4545 * 4546 * @hide 4547 */ 4548 @RemotableViewMethod 4549 public void setLayoutDirection(int layoutDirection) { 4550 if (getLayoutDirection() != layoutDirection) { 4551 resetResolvedLayoutDirection(); 4552 // Setting the flag will also request a layout. 4553 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4554 } 4555 } 4556 4557 /** 4558 * Returns the resolved layout direction for this view. 4559 * 4560 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4561 * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL. 4562 * 4563 * @hide 4564 */ 4565 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4566 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4567 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4568 }) 4569 public int getResolvedLayoutDirection() { 4570 resolveLayoutDirectionIfNeeded(); 4571 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 4572 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4573 } 4574 4575 /** 4576 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 4577 * layout attribute and/or the inherited value from the parent.</p> 4578 * 4579 * @return true if the layout is right-to-left. 4580 * 4581 * @hide 4582 */ 4583 @ViewDebug.ExportedProperty(category = "layout") 4584 public boolean isLayoutRtl() { 4585 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4586 } 4587 4588 /** 4589 * If this view doesn't do any drawing on its own, set this flag to 4590 * allow further optimizations. By default, this flag is not set on 4591 * View, but could be set on some View subclasses such as ViewGroup. 4592 * 4593 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4594 * you should clear this flag. 4595 * 4596 * @param willNotDraw whether or not this View draw on its own 4597 */ 4598 public void setWillNotDraw(boolean willNotDraw) { 4599 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4600 } 4601 4602 /** 4603 * Returns whether or not this View draws on its own. 4604 * 4605 * @return true if this view has nothing to draw, false otherwise 4606 */ 4607 @ViewDebug.ExportedProperty(category = "drawing") 4608 public boolean willNotDraw() { 4609 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4610 } 4611 4612 /** 4613 * When a View's drawing cache is enabled, drawing is redirected to an 4614 * offscreen bitmap. Some views, like an ImageView, must be able to 4615 * bypass this mechanism if they already draw a single bitmap, to avoid 4616 * unnecessary usage of the memory. 4617 * 4618 * @param willNotCacheDrawing true if this view does not cache its 4619 * drawing, false otherwise 4620 */ 4621 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 4622 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 4623 } 4624 4625 /** 4626 * Returns whether or not this View can cache its drawing or not. 4627 * 4628 * @return true if this view does not cache its drawing, false otherwise 4629 */ 4630 @ViewDebug.ExportedProperty(category = "drawing") 4631 public boolean willNotCacheDrawing() { 4632 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 4633 } 4634 4635 /** 4636 * Indicates whether this view reacts to click events or not. 4637 * 4638 * @return true if the view is clickable, false otherwise 4639 * 4640 * @see #setClickable(boolean) 4641 * @attr ref android.R.styleable#View_clickable 4642 */ 4643 @ViewDebug.ExportedProperty 4644 public boolean isClickable() { 4645 return (mViewFlags & CLICKABLE) == CLICKABLE; 4646 } 4647 4648 /** 4649 * Enables or disables click events for this view. When a view 4650 * is clickable it will change its state to "pressed" on every click. 4651 * Subclasses should set the view clickable to visually react to 4652 * user's clicks. 4653 * 4654 * @param clickable true to make the view clickable, false otherwise 4655 * 4656 * @see #isClickable() 4657 * @attr ref android.R.styleable#View_clickable 4658 */ 4659 public void setClickable(boolean clickable) { 4660 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 4661 } 4662 4663 /** 4664 * Indicates whether this view reacts to long click events or not. 4665 * 4666 * @return true if the view is long clickable, false otherwise 4667 * 4668 * @see #setLongClickable(boolean) 4669 * @attr ref android.R.styleable#View_longClickable 4670 */ 4671 public boolean isLongClickable() { 4672 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4673 } 4674 4675 /** 4676 * Enables or disables long click events for this view. When a view is long 4677 * clickable it reacts to the user holding down the button for a longer 4678 * duration than a tap. This event can either launch the listener or a 4679 * context menu. 4680 * 4681 * @param longClickable true to make the view long clickable, false otherwise 4682 * @see #isLongClickable() 4683 * @attr ref android.R.styleable#View_longClickable 4684 */ 4685 public void setLongClickable(boolean longClickable) { 4686 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4687 } 4688 4689 /** 4690 * Sets the pressed state for this view. 4691 * 4692 * @see #isClickable() 4693 * @see #setClickable(boolean) 4694 * 4695 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4696 * the View's internal state from a previously set "pressed" state. 4697 */ 4698 public void setPressed(boolean pressed) { 4699 if (pressed) { 4700 mPrivateFlags |= PRESSED; 4701 } else { 4702 mPrivateFlags &= ~PRESSED; 4703 } 4704 refreshDrawableState(); 4705 dispatchSetPressed(pressed); 4706 } 4707 4708 /** 4709 * Dispatch setPressed to all of this View's children. 4710 * 4711 * @see #setPressed(boolean) 4712 * 4713 * @param pressed The new pressed state 4714 */ 4715 protected void dispatchSetPressed(boolean pressed) { 4716 } 4717 4718 /** 4719 * Indicates whether the view is currently in pressed state. Unless 4720 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 4721 * the pressed state. 4722 * 4723 * @see #setPressed(boolean) 4724 * @see #isClickable() 4725 * @see #setClickable(boolean) 4726 * 4727 * @return true if the view is currently pressed, false otherwise 4728 */ 4729 public boolean isPressed() { 4730 return (mPrivateFlags & PRESSED) == PRESSED; 4731 } 4732 4733 /** 4734 * Indicates whether this view will save its state (that is, 4735 * whether its {@link #onSaveInstanceState} method will be called). 4736 * 4737 * @return Returns true if the view state saving is enabled, else false. 4738 * 4739 * @see #setSaveEnabled(boolean) 4740 * @attr ref android.R.styleable#View_saveEnabled 4741 */ 4742 public boolean isSaveEnabled() { 4743 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 4744 } 4745 4746 /** 4747 * Controls whether the saving of this view's state is 4748 * enabled (that is, whether its {@link #onSaveInstanceState} method 4749 * will be called). Note that even if freezing is enabled, the 4750 * view still must have an id assigned to it (via {@link #setId(int)}) 4751 * for its state to be saved. This flag can only disable the 4752 * saving of this view; any child views may still have their state saved. 4753 * 4754 * @param enabled Set to false to <em>disable</em> state saving, or true 4755 * (the default) to allow it. 4756 * 4757 * @see #isSaveEnabled() 4758 * @see #setId(int) 4759 * @see #onSaveInstanceState() 4760 * @attr ref android.R.styleable#View_saveEnabled 4761 */ 4762 public void setSaveEnabled(boolean enabled) { 4763 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 4764 } 4765 4766 /** 4767 * Gets whether the framework should discard touches when the view's 4768 * window is obscured by another visible window. 4769 * Refer to the {@link View} security documentation for more details. 4770 * 4771 * @return True if touch filtering is enabled. 4772 * 4773 * @see #setFilterTouchesWhenObscured(boolean) 4774 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4775 */ 4776 @ViewDebug.ExportedProperty 4777 public boolean getFilterTouchesWhenObscured() { 4778 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4779 } 4780 4781 /** 4782 * Sets whether the framework should discard touches when the view's 4783 * window is obscured by another visible window. 4784 * Refer to the {@link View} security documentation for more details. 4785 * 4786 * @param enabled True if touch filtering should be enabled. 4787 * 4788 * @see #getFilterTouchesWhenObscured 4789 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4790 */ 4791 public void setFilterTouchesWhenObscured(boolean enabled) { 4792 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4793 FILTER_TOUCHES_WHEN_OBSCURED); 4794 } 4795 4796 /** 4797 * Indicates whether the entire hierarchy under this view will save its 4798 * state when a state saving traversal occurs from its parent. The default 4799 * is true; if false, these views will not be saved unless 4800 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4801 * 4802 * @return Returns true if the view state saving from parent is enabled, else false. 4803 * 4804 * @see #setSaveFromParentEnabled(boolean) 4805 */ 4806 public boolean isSaveFromParentEnabled() { 4807 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4808 } 4809 4810 /** 4811 * Controls whether the entire hierarchy under this view will save its 4812 * state when a state saving traversal occurs from its parent. The default 4813 * is true; if false, these views will not be saved unless 4814 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4815 * 4816 * @param enabled Set to false to <em>disable</em> state saving, or true 4817 * (the default) to allow it. 4818 * 4819 * @see #isSaveFromParentEnabled() 4820 * @see #setId(int) 4821 * @see #onSaveInstanceState() 4822 */ 4823 public void setSaveFromParentEnabled(boolean enabled) { 4824 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4825 } 4826 4827 4828 /** 4829 * Returns whether this View is able to take focus. 4830 * 4831 * @return True if this view can take focus, or false otherwise. 4832 * @attr ref android.R.styleable#View_focusable 4833 */ 4834 @ViewDebug.ExportedProperty(category = "focus") 4835 public final boolean isFocusable() { 4836 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4837 } 4838 4839 /** 4840 * When a view is focusable, it may not want to take focus when in touch mode. 4841 * For example, a button would like focus when the user is navigating via a D-pad 4842 * so that the user can click on it, but once the user starts touching the screen, 4843 * the button shouldn't take focus 4844 * @return Whether the view is focusable in touch mode. 4845 * @attr ref android.R.styleable#View_focusableInTouchMode 4846 */ 4847 @ViewDebug.ExportedProperty 4848 public final boolean isFocusableInTouchMode() { 4849 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4850 } 4851 4852 /** 4853 * Find the nearest view in the specified direction that can take focus. 4854 * This does not actually give focus to that view. 4855 * 4856 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4857 * 4858 * @return The nearest focusable in the specified direction, or null if none 4859 * can be found. 4860 */ 4861 public View focusSearch(int direction) { 4862 if (mParent != null) { 4863 return mParent.focusSearch(this, direction); 4864 } else { 4865 return null; 4866 } 4867 } 4868 4869 /** 4870 * This method is the last chance for the focused view and its ancestors to 4871 * respond to an arrow key. This is called when the focused view did not 4872 * consume the key internally, nor could the view system find a new view in 4873 * the requested direction to give focus to. 4874 * 4875 * @param focused The currently focused view. 4876 * @param direction The direction focus wants to move. One of FOCUS_UP, 4877 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4878 * @return True if the this view consumed this unhandled move. 4879 */ 4880 public boolean dispatchUnhandledMove(View focused, int direction) { 4881 return false; 4882 } 4883 4884 /** 4885 * If a user manually specified the next view id for a particular direction, 4886 * use the root to look up the view. 4887 * @param root The root view of the hierarchy containing this view. 4888 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4889 * or FOCUS_BACKWARD. 4890 * @return The user specified next view, or null if there is none. 4891 */ 4892 View findUserSetNextFocus(View root, int direction) { 4893 switch (direction) { 4894 case FOCUS_LEFT: 4895 if (mNextFocusLeftId == View.NO_ID) return null; 4896 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 4897 case FOCUS_RIGHT: 4898 if (mNextFocusRightId == View.NO_ID) return null; 4899 return findViewInsideOutShouldExist(root, mNextFocusRightId); 4900 case FOCUS_UP: 4901 if (mNextFocusUpId == View.NO_ID) return null; 4902 return findViewInsideOutShouldExist(root, mNextFocusUpId); 4903 case FOCUS_DOWN: 4904 if (mNextFocusDownId == View.NO_ID) return null; 4905 return findViewInsideOutShouldExist(root, mNextFocusDownId); 4906 case FOCUS_FORWARD: 4907 if (mNextFocusForwardId == View.NO_ID) return null; 4908 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 4909 case FOCUS_BACKWARD: { 4910 final int id = mID; 4911 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 4912 @Override 4913 public boolean apply(View t) { 4914 return t.mNextFocusForwardId == id; 4915 } 4916 }); 4917 } 4918 } 4919 return null; 4920 } 4921 4922 private View findViewInsideOutShouldExist(View root, final int childViewId) { 4923 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 4924 @Override 4925 public boolean apply(View t) { 4926 return t.mID == childViewId; 4927 } 4928 }); 4929 4930 if (result == null) { 4931 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4932 + "by user for id " + childViewId); 4933 } 4934 return result; 4935 } 4936 4937 /** 4938 * Find and return all focusable views that are descendants of this view, 4939 * possibly including this view if it is focusable itself. 4940 * 4941 * @param direction The direction of the focus 4942 * @return A list of focusable views 4943 */ 4944 public ArrayList<View> getFocusables(int direction) { 4945 ArrayList<View> result = new ArrayList<View>(24); 4946 addFocusables(result, direction); 4947 return result; 4948 } 4949 4950 /** 4951 * Add any focusable views that are descendants of this view (possibly 4952 * including this view if it is focusable itself) to views. If we are in touch mode, 4953 * only add views that are also focusable in touch mode. 4954 * 4955 * @param views Focusable views found so far 4956 * @param direction The direction of the focus 4957 */ 4958 public void addFocusables(ArrayList<View> views, int direction) { 4959 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4960 } 4961 4962 /** 4963 * Adds any focusable views that are descendants of this view (possibly 4964 * including this view if it is focusable itself) to views. This method 4965 * adds all focusable views regardless if we are in touch mode or 4966 * only views focusable in touch mode if we are in touch mode depending on 4967 * the focusable mode paramater. 4968 * 4969 * @param views Focusable views found so far or null if all we are interested is 4970 * the number of focusables. 4971 * @param direction The direction of the focus. 4972 * @param focusableMode The type of focusables to be added. 4973 * 4974 * @see #FOCUSABLES_ALL 4975 * @see #FOCUSABLES_TOUCH_MODE 4976 */ 4977 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4978 if (!isFocusable()) { 4979 return; 4980 } 4981 4982 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4983 isInTouchMode() && !isFocusableInTouchMode()) { 4984 return; 4985 } 4986 4987 if (views != null) { 4988 views.add(this); 4989 } 4990 } 4991 4992 /** 4993 * Finds the Views that contain given text. The containment is case insensitive. 4994 * As View's text is considered any text content that View renders. 4995 * 4996 * @param outViews The output list of matching Views. 4997 * @param text The text to match against. 4998 */ 4999 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 5000 } 5001 5002 /** 5003 * Find and return all touchable views that are descendants of this view, 5004 * possibly including this view if it is touchable itself. 5005 * 5006 * @return A list of touchable views 5007 */ 5008 public ArrayList<View> getTouchables() { 5009 ArrayList<View> result = new ArrayList<View>(); 5010 addTouchables(result); 5011 return result; 5012 } 5013 5014 /** 5015 * Add any touchable views that are descendants of this view (possibly 5016 * including this view if it is touchable itself) to views. 5017 * 5018 * @param views Touchable views found so far 5019 */ 5020 public void addTouchables(ArrayList<View> views) { 5021 final int viewFlags = mViewFlags; 5022 5023 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5024 && (viewFlags & ENABLED_MASK) == ENABLED) { 5025 views.add(this); 5026 } 5027 } 5028 5029 /** 5030 * Call this to try to give focus to a specific view or to one of its 5031 * descendants. 5032 * 5033 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5034 * false), or if it is focusable and it is not focusable in touch mode 5035 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5036 * 5037 * See also {@link #focusSearch(int)}, which is what you call to say that you 5038 * have focus, and you want your parent to look for the next one. 5039 * 5040 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 5041 * {@link #FOCUS_DOWN} and <code>null</code>. 5042 * 5043 * @return Whether this view or one of its descendants actually took focus. 5044 */ 5045 public final boolean requestFocus() { 5046 return requestFocus(View.FOCUS_DOWN); 5047 } 5048 5049 5050 /** 5051 * Call this to try to give focus to a specific view or to one of its 5052 * descendants and give it a hint about what direction focus is heading. 5053 * 5054 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5055 * false), or if it is focusable and it is not focusable in touch mode 5056 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5057 * 5058 * See also {@link #focusSearch(int)}, which is what you call to say that you 5059 * have focus, and you want your parent to look for the next one. 5060 * 5061 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 5062 * <code>null</code> set for the previously focused rectangle. 5063 * 5064 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5065 * @return Whether this view or one of its descendants actually took focus. 5066 */ 5067 public final boolean requestFocus(int direction) { 5068 return requestFocus(direction, null); 5069 } 5070 5071 /** 5072 * Call this to try to give focus to a specific view or to one of its descendants 5073 * and give it hints about the direction and a specific rectangle that the focus 5074 * is coming from. The rectangle can help give larger views a finer grained hint 5075 * about where focus is coming from, and therefore, where to show selection, or 5076 * forward focus change internally. 5077 * 5078 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5079 * false), or if it is focusable and it is not focusable in touch mode 5080 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5081 * 5082 * A View will not take focus if it is not visible. 5083 * 5084 * A View will not take focus if one of its parents has 5085 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 5086 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 5087 * 5088 * See also {@link #focusSearch(int)}, which is what you call to say that you 5089 * have focus, and you want your parent to look for the next one. 5090 * 5091 * You may wish to override this method if your custom {@link View} has an internal 5092 * {@link View} that it wishes to forward the request to. 5093 * 5094 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5095 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 5096 * to give a finer grained hint about where focus is coming from. May be null 5097 * if there is no hint. 5098 * @return Whether this view or one of its descendants actually took focus. 5099 */ 5100 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 5101 // need to be focusable 5102 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 5103 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5104 return false; 5105 } 5106 5107 // need to be focusable in touch mode if in touch mode 5108 if (isInTouchMode() && 5109 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 5110 return false; 5111 } 5112 5113 // need to not have any parents blocking us 5114 if (hasAncestorThatBlocksDescendantFocus()) { 5115 return false; 5116 } 5117 5118 handleFocusGainInternal(direction, previouslyFocusedRect); 5119 return true; 5120 } 5121 5122 /** Gets the ViewAncestor, or null if not attached. */ 5123 /*package*/ ViewRootImpl getViewRootImpl() { 5124 View root = getRootView(); 5125 return root != null ? (ViewRootImpl)root.getParent() : null; 5126 } 5127 5128 /** 5129 * Call this to try to give focus to a specific view or to one of its descendants. This is a 5130 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 5131 * touch mode to request focus when they are touched. 5132 * 5133 * @return Whether this view or one of its descendants actually took focus. 5134 * 5135 * @see #isInTouchMode() 5136 * 5137 */ 5138 public final boolean requestFocusFromTouch() { 5139 // Leave touch mode if we need to 5140 if (isInTouchMode()) { 5141 ViewRootImpl viewRoot = getViewRootImpl(); 5142 if (viewRoot != null) { 5143 viewRoot.ensureTouchMode(false); 5144 } 5145 } 5146 return requestFocus(View.FOCUS_DOWN); 5147 } 5148 5149 /** 5150 * @return Whether any ancestor of this view blocks descendant focus. 5151 */ 5152 private boolean hasAncestorThatBlocksDescendantFocus() { 5153 ViewParent ancestor = mParent; 5154 while (ancestor instanceof ViewGroup) { 5155 final ViewGroup vgAncestor = (ViewGroup) ancestor; 5156 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 5157 return true; 5158 } else { 5159 ancestor = vgAncestor.getParent(); 5160 } 5161 } 5162 return false; 5163 } 5164 5165 /** 5166 * @hide 5167 */ 5168 public void dispatchStartTemporaryDetach() { 5169 onStartTemporaryDetach(); 5170 } 5171 5172 /** 5173 * This is called when a container is going to temporarily detach a child, with 5174 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 5175 * It will either be followed by {@link #onFinishTemporaryDetach()} or 5176 * {@link #onDetachedFromWindow()} when the container is done. 5177 */ 5178 public void onStartTemporaryDetach() { 5179 removeUnsetPressCallback(); 5180 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 5181 } 5182 5183 /** 5184 * @hide 5185 */ 5186 public void dispatchFinishTemporaryDetach() { 5187 onFinishTemporaryDetach(); 5188 } 5189 5190 /** 5191 * Called after {@link #onStartTemporaryDetach} when the container is done 5192 * changing the view. 5193 */ 5194 public void onFinishTemporaryDetach() { 5195 } 5196 5197 /** 5198 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 5199 * for this view's window. Returns null if the view is not currently attached 5200 * to the window. Normally you will not need to use this directly, but 5201 * just use the standard high-level event callbacks like 5202 * {@link #onKeyDown(int, KeyEvent)}. 5203 */ 5204 public KeyEvent.DispatcherState getKeyDispatcherState() { 5205 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 5206 } 5207 5208 /** 5209 * Dispatch a key event before it is processed by any input method 5210 * associated with the view hierarchy. This can be used to intercept 5211 * key events in special situations before the IME consumes them; a 5212 * typical example would be handling the BACK key to update the application's 5213 * UI instead of allowing the IME to see it and close itself. 5214 * 5215 * @param event The key event to be dispatched. 5216 * @return True if the event was handled, false otherwise. 5217 */ 5218 public boolean dispatchKeyEventPreIme(KeyEvent event) { 5219 return onKeyPreIme(event.getKeyCode(), event); 5220 } 5221 5222 /** 5223 * Dispatch a key event to the next view on the focus path. This path runs 5224 * from the top of the view tree down to the currently focused view. If this 5225 * view has focus, it will dispatch to itself. Otherwise it will dispatch 5226 * the next node down the focus path. This method also fires any key 5227 * listeners. 5228 * 5229 * @param event The key event to be dispatched. 5230 * @return True if the event was handled, false otherwise. 5231 */ 5232 public boolean dispatchKeyEvent(KeyEvent event) { 5233 if (mInputEventConsistencyVerifier != null) { 5234 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 5235 } 5236 5237 // Give any attached key listener a first crack at the event. 5238 //noinspection SimplifiableIfStatement 5239 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5240 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 5241 return true; 5242 } 5243 5244 if (event.dispatch(this, mAttachInfo != null 5245 ? mAttachInfo.mKeyDispatchState : null, this)) { 5246 return true; 5247 } 5248 5249 if (mInputEventConsistencyVerifier != null) { 5250 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5251 } 5252 return false; 5253 } 5254 5255 /** 5256 * Dispatches a key shortcut event. 5257 * 5258 * @param event The key event to be dispatched. 5259 * @return True if the event was handled by the view, false otherwise. 5260 */ 5261 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5262 return onKeyShortcut(event.getKeyCode(), event); 5263 } 5264 5265 /** 5266 * Pass the touch screen motion event down to the target view, or this 5267 * view if it is the target. 5268 * 5269 * @param event The motion event to be dispatched. 5270 * @return True if the event was handled by the view, false otherwise. 5271 */ 5272 public boolean dispatchTouchEvent(MotionEvent event) { 5273 if (mInputEventConsistencyVerifier != null) { 5274 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5275 } 5276 5277 if (onFilterTouchEventForSecurity(event)) { 5278 //noinspection SimplifiableIfStatement 5279 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 5280 mOnTouchListener.onTouch(this, event)) { 5281 return true; 5282 } 5283 5284 if (onTouchEvent(event)) { 5285 return true; 5286 } 5287 } 5288 5289 if (mInputEventConsistencyVerifier != null) { 5290 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5291 } 5292 return false; 5293 } 5294 5295 /** 5296 * Filter the touch event to apply security policies. 5297 * 5298 * @param event The motion event to be filtered. 5299 * @return True if the event should be dispatched, false if the event should be dropped. 5300 * 5301 * @see #getFilterTouchesWhenObscured 5302 */ 5303 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5304 //noinspection RedundantIfStatement 5305 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5306 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5307 // Window is obscured, drop this touch. 5308 return false; 5309 } 5310 return true; 5311 } 5312 5313 /** 5314 * Pass a trackball motion event down to the focused view. 5315 * 5316 * @param event The motion event to be dispatched. 5317 * @return True if the event was handled by the view, false otherwise. 5318 */ 5319 public boolean dispatchTrackballEvent(MotionEvent event) { 5320 if (mInputEventConsistencyVerifier != null) { 5321 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5322 } 5323 5324 return onTrackballEvent(event); 5325 } 5326 5327 /** 5328 * Dispatch a generic motion event. 5329 * <p> 5330 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5331 * are delivered to the view under the pointer. All other generic motion events are 5332 * delivered to the focused view. Hover events are handled specially and are delivered 5333 * to {@link #onHoverEvent(MotionEvent)}. 5334 * </p> 5335 * 5336 * @param event The motion event to be dispatched. 5337 * @return True if the event was handled by the view, false otherwise. 5338 */ 5339 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5340 if (mInputEventConsistencyVerifier != null) { 5341 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5342 } 5343 5344 final int source = event.getSource(); 5345 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5346 final int action = event.getAction(); 5347 if (action == MotionEvent.ACTION_HOVER_ENTER 5348 || action == MotionEvent.ACTION_HOVER_MOVE 5349 || action == MotionEvent.ACTION_HOVER_EXIT) { 5350 if (dispatchHoverEvent(event)) { 5351 return true; 5352 } 5353 } else if (dispatchGenericPointerEvent(event)) { 5354 return true; 5355 } 5356 } else if (dispatchGenericFocusedEvent(event)) { 5357 return true; 5358 } 5359 5360 if (dispatchGenericMotionEventInternal(event)) { 5361 return true; 5362 } 5363 5364 if (mInputEventConsistencyVerifier != null) { 5365 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5366 } 5367 return false; 5368 } 5369 5370 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 5371 //noinspection SimplifiableIfStatement 5372 if (mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5373 && mOnGenericMotionListener.onGenericMotion(this, event)) { 5374 return true; 5375 } 5376 5377 if (onGenericMotionEvent(event)) { 5378 return true; 5379 } 5380 5381 if (mInputEventConsistencyVerifier != null) { 5382 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5383 } 5384 return false; 5385 } 5386 5387 /** 5388 * Dispatch a hover event. 5389 * <p> 5390 * Do not call this method directly. 5391 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5392 * </p> 5393 * 5394 * @param event The motion event to be dispatched. 5395 * @return True if the event was handled by the view, false otherwise. 5396 */ 5397 protected boolean dispatchHoverEvent(MotionEvent event) { 5398 //noinspection SimplifiableIfStatement 5399 if (mOnHoverListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5400 && mOnHoverListener.onHover(this, event)) { 5401 return true; 5402 } 5403 5404 return onHoverEvent(event); 5405 } 5406 5407 /** 5408 * Returns true if the view has a child to which it has recently sent 5409 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 5410 * it does not have a hovered child, then it must be the innermost hovered view. 5411 * @hide 5412 */ 5413 protected boolean hasHoveredChild() { 5414 return false; 5415 } 5416 5417 /** 5418 * Dispatch a generic motion event to the view under the first pointer. 5419 * <p> 5420 * Do not call this method directly. 5421 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5422 * </p> 5423 * 5424 * @param event The motion event to be dispatched. 5425 * @return True if the event was handled by the view, false otherwise. 5426 */ 5427 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5428 return false; 5429 } 5430 5431 /** 5432 * Dispatch a generic motion event to the currently focused view. 5433 * <p> 5434 * Do not call this method directly. 5435 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5436 * </p> 5437 * 5438 * @param event The motion event to be dispatched. 5439 * @return True if the event was handled by the view, false otherwise. 5440 */ 5441 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5442 return false; 5443 } 5444 5445 /** 5446 * Dispatch a pointer event. 5447 * <p> 5448 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5449 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5450 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5451 * and should not be expected to handle other pointing device features. 5452 * </p> 5453 * 5454 * @param event The motion event to be dispatched. 5455 * @return True if the event was handled by the view, false otherwise. 5456 * @hide 5457 */ 5458 public final boolean dispatchPointerEvent(MotionEvent event) { 5459 if (event.isTouchEvent()) { 5460 return dispatchTouchEvent(event); 5461 } else { 5462 return dispatchGenericMotionEvent(event); 5463 } 5464 } 5465 5466 /** 5467 * Called when the window containing this view gains or loses window focus. 5468 * ViewGroups should override to route to their children. 5469 * 5470 * @param hasFocus True if the window containing this view now has focus, 5471 * false otherwise. 5472 */ 5473 public void dispatchWindowFocusChanged(boolean hasFocus) { 5474 onWindowFocusChanged(hasFocus); 5475 } 5476 5477 /** 5478 * Called when the window containing this view gains or loses focus. Note 5479 * that this is separate from view focus: to receive key events, both 5480 * your view and its window must have focus. If a window is displayed 5481 * on top of yours that takes input focus, then your own window will lose 5482 * focus but the view focus will remain unchanged. 5483 * 5484 * @param hasWindowFocus True if the window containing this view now has 5485 * focus, false otherwise. 5486 */ 5487 public void onWindowFocusChanged(boolean hasWindowFocus) { 5488 InputMethodManager imm = InputMethodManager.peekInstance(); 5489 if (!hasWindowFocus) { 5490 if (isPressed()) { 5491 setPressed(false); 5492 } 5493 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5494 imm.focusOut(this); 5495 } 5496 removeLongPressCallback(); 5497 removeTapCallback(); 5498 onFocusLost(); 5499 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5500 imm.focusIn(this); 5501 } 5502 refreshDrawableState(); 5503 } 5504 5505 /** 5506 * Returns true if this view is in a window that currently has window focus. 5507 * Note that this is not the same as the view itself having focus. 5508 * 5509 * @return True if this view is in a window that currently has window focus. 5510 */ 5511 public boolean hasWindowFocus() { 5512 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5513 } 5514 5515 /** 5516 * Dispatch a view visibility change down the view hierarchy. 5517 * ViewGroups should override to route to their children. 5518 * @param changedView The view whose visibility changed. Could be 'this' or 5519 * an ancestor view. 5520 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5521 * {@link #INVISIBLE} or {@link #GONE}. 5522 */ 5523 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5524 onVisibilityChanged(changedView, visibility); 5525 } 5526 5527 /** 5528 * Called when the visibility of the view or an ancestor of the view is changed. 5529 * @param changedView The view whose visibility changed. Could be 'this' or 5530 * an ancestor view. 5531 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5532 * {@link #INVISIBLE} or {@link #GONE}. 5533 */ 5534 protected void onVisibilityChanged(View changedView, int visibility) { 5535 if (visibility == VISIBLE) { 5536 if (mAttachInfo != null) { 5537 initialAwakenScrollBars(); 5538 } else { 5539 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5540 } 5541 } 5542 } 5543 5544 /** 5545 * Dispatch a hint about whether this view is displayed. For instance, when 5546 * a View moves out of the screen, it might receives a display hint indicating 5547 * the view is not displayed. Applications should not <em>rely</em> on this hint 5548 * as there is no guarantee that they will receive one. 5549 * 5550 * @param hint A hint about whether or not this view is displayed: 5551 * {@link #VISIBLE} or {@link #INVISIBLE}. 5552 */ 5553 public void dispatchDisplayHint(int hint) { 5554 onDisplayHint(hint); 5555 } 5556 5557 /** 5558 * Gives this view a hint about whether is displayed or not. For instance, when 5559 * a View moves out of the screen, it might receives a display hint indicating 5560 * the view is not displayed. Applications should not <em>rely</em> on this hint 5561 * as there is no guarantee that they will receive one. 5562 * 5563 * @param hint A hint about whether or not this view is displayed: 5564 * {@link #VISIBLE} or {@link #INVISIBLE}. 5565 */ 5566 protected void onDisplayHint(int hint) { 5567 } 5568 5569 /** 5570 * Dispatch a window visibility change down the view hierarchy. 5571 * ViewGroups should override to route to their children. 5572 * 5573 * @param visibility The new visibility of the window. 5574 * 5575 * @see #onWindowVisibilityChanged(int) 5576 */ 5577 public void dispatchWindowVisibilityChanged(int visibility) { 5578 onWindowVisibilityChanged(visibility); 5579 } 5580 5581 /** 5582 * Called when the window containing has change its visibility 5583 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5584 * that this tells you whether or not your window is being made visible 5585 * to the window manager; this does <em>not</em> tell you whether or not 5586 * your window is obscured by other windows on the screen, even if it 5587 * is itself visible. 5588 * 5589 * @param visibility The new visibility of the window. 5590 */ 5591 protected void onWindowVisibilityChanged(int visibility) { 5592 if (visibility == VISIBLE) { 5593 initialAwakenScrollBars(); 5594 } 5595 } 5596 5597 /** 5598 * Returns the current visibility of the window this view is attached to 5599 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 5600 * 5601 * @return Returns the current visibility of the view's window. 5602 */ 5603 public int getWindowVisibility() { 5604 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 5605 } 5606 5607 /** 5608 * Retrieve the overall visible display size in which the window this view is 5609 * attached to has been positioned in. This takes into account screen 5610 * decorations above the window, for both cases where the window itself 5611 * is being position inside of them or the window is being placed under 5612 * then and covered insets are used for the window to position its content 5613 * inside. In effect, this tells you the available area where content can 5614 * be placed and remain visible to users. 5615 * 5616 * <p>This function requires an IPC back to the window manager to retrieve 5617 * the requested information, so should not be used in performance critical 5618 * code like drawing. 5619 * 5620 * @param outRect Filled in with the visible display frame. If the view 5621 * is not attached to a window, this is simply the raw display size. 5622 */ 5623 public void getWindowVisibleDisplayFrame(Rect outRect) { 5624 if (mAttachInfo != null) { 5625 try { 5626 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 5627 } catch (RemoteException e) { 5628 return; 5629 } 5630 // XXX This is really broken, and probably all needs to be done 5631 // in the window manager, and we need to know more about whether 5632 // we want the area behind or in front of the IME. 5633 final Rect insets = mAttachInfo.mVisibleInsets; 5634 outRect.left += insets.left; 5635 outRect.top += insets.top; 5636 outRect.right -= insets.right; 5637 outRect.bottom -= insets.bottom; 5638 return; 5639 } 5640 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 5641 d.getRectSize(outRect); 5642 } 5643 5644 /** 5645 * Dispatch a notification about a resource configuration change down 5646 * the view hierarchy. 5647 * ViewGroups should override to route to their children. 5648 * 5649 * @param newConfig The new resource configuration. 5650 * 5651 * @see #onConfigurationChanged(android.content.res.Configuration) 5652 */ 5653 public void dispatchConfigurationChanged(Configuration newConfig) { 5654 onConfigurationChanged(newConfig); 5655 } 5656 5657 /** 5658 * Called when the current configuration of the resources being used 5659 * by the application have changed. You can use this to decide when 5660 * to reload resources that can changed based on orientation and other 5661 * configuration characterstics. You only need to use this if you are 5662 * not relying on the normal {@link android.app.Activity} mechanism of 5663 * recreating the activity instance upon a configuration change. 5664 * 5665 * @param newConfig The new resource configuration. 5666 */ 5667 protected void onConfigurationChanged(Configuration newConfig) { 5668 } 5669 5670 /** 5671 * Private function to aggregate all per-view attributes in to the view 5672 * root. 5673 */ 5674 void dispatchCollectViewAttributes(int visibility) { 5675 performCollectViewAttributes(visibility); 5676 } 5677 5678 void performCollectViewAttributes(int visibility) { 5679 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 5680 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 5681 mAttachInfo.mKeepScreenOn = true; 5682 } 5683 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 5684 if (mOnSystemUiVisibilityChangeListener != null) { 5685 mAttachInfo.mHasSystemUiListeners = true; 5686 } 5687 } 5688 } 5689 5690 void needGlobalAttributesUpdate(boolean force) { 5691 final AttachInfo ai = mAttachInfo; 5692 if (ai != null) { 5693 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 5694 || ai.mHasSystemUiListeners) { 5695 ai.mRecomputeGlobalAttributes = true; 5696 } 5697 } 5698 } 5699 5700 /** 5701 * Returns whether the device is currently in touch mode. Touch mode is entered 5702 * once the user begins interacting with the device by touch, and affects various 5703 * things like whether focus is always visible to the user. 5704 * 5705 * @return Whether the device is in touch mode. 5706 */ 5707 @ViewDebug.ExportedProperty 5708 public boolean isInTouchMode() { 5709 if (mAttachInfo != null) { 5710 return mAttachInfo.mInTouchMode; 5711 } else { 5712 return ViewRootImpl.isInTouchMode(); 5713 } 5714 } 5715 5716 /** 5717 * Returns the context the view is running in, through which it can 5718 * access the current theme, resources, etc. 5719 * 5720 * @return The view's Context. 5721 */ 5722 @ViewDebug.CapturedViewProperty 5723 public final Context getContext() { 5724 return mContext; 5725 } 5726 5727 /** 5728 * Handle a key event before it is processed by any input method 5729 * associated with the view hierarchy. This can be used to intercept 5730 * key events in special situations before the IME consumes them; a 5731 * typical example would be handling the BACK key to update the application's 5732 * UI instead of allowing the IME to see it and close itself. 5733 * 5734 * @param keyCode The value in event.getKeyCode(). 5735 * @param event Description of the key event. 5736 * @return If you handled the event, return true. If you want to allow the 5737 * event to be handled by the next receiver, return false. 5738 */ 5739 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 5740 return false; 5741 } 5742 5743 /** 5744 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 5745 * KeyEvent.Callback.onKeyDown()}: perform press of the view 5746 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 5747 * is released, if the view is enabled and clickable. 5748 * 5749 * @param keyCode A key code that represents the button pressed, from 5750 * {@link android.view.KeyEvent}. 5751 * @param event The KeyEvent object that defines the button action. 5752 */ 5753 public boolean onKeyDown(int keyCode, KeyEvent event) { 5754 boolean result = false; 5755 5756 switch (keyCode) { 5757 case KeyEvent.KEYCODE_DPAD_CENTER: 5758 case KeyEvent.KEYCODE_ENTER: { 5759 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5760 return true; 5761 } 5762 // Long clickable items don't necessarily have to be clickable 5763 if (((mViewFlags & CLICKABLE) == CLICKABLE || 5764 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 5765 (event.getRepeatCount() == 0)) { 5766 setPressed(true); 5767 checkForLongClick(0); 5768 return true; 5769 } 5770 break; 5771 } 5772 } 5773 return result; 5774 } 5775 5776 /** 5777 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 5778 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 5779 * the event). 5780 */ 5781 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 5782 return false; 5783 } 5784 5785 /** 5786 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 5787 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 5788 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 5789 * {@link KeyEvent#KEYCODE_ENTER} is released. 5790 * 5791 * @param keyCode A key code that represents the button pressed, from 5792 * {@link android.view.KeyEvent}. 5793 * @param event The KeyEvent object that defines the button action. 5794 */ 5795 public boolean onKeyUp(int keyCode, KeyEvent event) { 5796 boolean result = false; 5797 5798 switch (keyCode) { 5799 case KeyEvent.KEYCODE_DPAD_CENTER: 5800 case KeyEvent.KEYCODE_ENTER: { 5801 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5802 return true; 5803 } 5804 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 5805 setPressed(false); 5806 5807 if (!mHasPerformedLongPress) { 5808 // This is a tap, so remove the longpress check 5809 removeLongPressCallback(); 5810 5811 result = performClick(); 5812 } 5813 } 5814 break; 5815 } 5816 } 5817 return result; 5818 } 5819 5820 /** 5821 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 5822 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 5823 * the event). 5824 * 5825 * @param keyCode A key code that represents the button pressed, from 5826 * {@link android.view.KeyEvent}. 5827 * @param repeatCount The number of times the action was made. 5828 * @param event The KeyEvent object that defines the button action. 5829 */ 5830 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 5831 return false; 5832 } 5833 5834 /** 5835 * Called on the focused view when a key shortcut event is not handled. 5836 * Override this method to implement local key shortcuts for the View. 5837 * Key shortcuts can also be implemented by setting the 5838 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 5839 * 5840 * @param keyCode The value in event.getKeyCode(). 5841 * @param event Description of the key event. 5842 * @return If you handled the event, return true. If you want to allow the 5843 * event to be handled by the next receiver, return false. 5844 */ 5845 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 5846 return false; 5847 } 5848 5849 /** 5850 * Check whether the called view is a text editor, in which case it 5851 * would make sense to automatically display a soft input window for 5852 * it. Subclasses should override this if they implement 5853 * {@link #onCreateInputConnection(EditorInfo)} to return true if 5854 * a call on that method would return a non-null InputConnection, and 5855 * they are really a first-class editor that the user would normally 5856 * start typing on when the go into a window containing your view. 5857 * 5858 * <p>The default implementation always returns false. This does 5859 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 5860 * will not be called or the user can not otherwise perform edits on your 5861 * view; it is just a hint to the system that this is not the primary 5862 * purpose of this view. 5863 * 5864 * @return Returns true if this view is a text editor, else false. 5865 */ 5866 public boolean onCheckIsTextEditor() { 5867 return false; 5868 } 5869 5870 /** 5871 * Create a new InputConnection for an InputMethod to interact 5872 * with the view. The default implementation returns null, since it doesn't 5873 * support input methods. You can override this to implement such support. 5874 * This is only needed for views that take focus and text input. 5875 * 5876 * <p>When implementing this, you probably also want to implement 5877 * {@link #onCheckIsTextEditor()} to indicate you will return a 5878 * non-null InputConnection. 5879 * 5880 * @param outAttrs Fill in with attribute information about the connection. 5881 */ 5882 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 5883 return null; 5884 } 5885 5886 /** 5887 * Called by the {@link android.view.inputmethod.InputMethodManager} 5888 * when a view who is not the current 5889 * input connection target is trying to make a call on the manager. The 5890 * default implementation returns false; you can override this to return 5891 * true for certain views if you are performing InputConnection proxying 5892 * to them. 5893 * @param view The View that is making the InputMethodManager call. 5894 * @return Return true to allow the call, false to reject. 5895 */ 5896 public boolean checkInputConnectionProxy(View view) { 5897 return false; 5898 } 5899 5900 /** 5901 * Show the context menu for this view. It is not safe to hold on to the 5902 * menu after returning from this method. 5903 * 5904 * You should normally not overload this method. Overload 5905 * {@link #onCreateContextMenu(ContextMenu)} or define an 5906 * {@link OnCreateContextMenuListener} to add items to the context menu. 5907 * 5908 * @param menu The context menu to populate 5909 */ 5910 public void createContextMenu(ContextMenu menu) { 5911 ContextMenuInfo menuInfo = getContextMenuInfo(); 5912 5913 // Sets the current menu info so all items added to menu will have 5914 // my extra info set. 5915 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 5916 5917 onCreateContextMenu(menu); 5918 if (mOnCreateContextMenuListener != null) { 5919 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 5920 } 5921 5922 // Clear the extra information so subsequent items that aren't mine don't 5923 // have my extra info. 5924 ((MenuBuilder)menu).setCurrentMenuInfo(null); 5925 5926 if (mParent != null) { 5927 mParent.createContextMenu(menu); 5928 } 5929 } 5930 5931 /** 5932 * Views should implement this if they have extra information to associate 5933 * with the context menu. The return result is supplied as a parameter to 5934 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 5935 * callback. 5936 * 5937 * @return Extra information about the item for which the context menu 5938 * should be shown. This information will vary across different 5939 * subclasses of View. 5940 */ 5941 protected ContextMenuInfo getContextMenuInfo() { 5942 return null; 5943 } 5944 5945 /** 5946 * Views should implement this if the view itself is going to add items to 5947 * the context menu. 5948 * 5949 * @param menu the context menu to populate 5950 */ 5951 protected void onCreateContextMenu(ContextMenu menu) { 5952 } 5953 5954 /** 5955 * Implement this method to handle trackball motion events. The 5956 * <em>relative</em> movement of the trackball since the last event 5957 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 5958 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 5959 * that a movement of 1 corresponds to the user pressing one DPAD key (so 5960 * they will often be fractional values, representing the more fine-grained 5961 * movement information available from a trackball). 5962 * 5963 * @param event The motion event. 5964 * @return True if the event was handled, false otherwise. 5965 */ 5966 public boolean onTrackballEvent(MotionEvent event) { 5967 return false; 5968 } 5969 5970 /** 5971 * Implement this method to handle generic motion events. 5972 * <p> 5973 * Generic motion events describe joystick movements, mouse hovers, track pad 5974 * touches, scroll wheel movements and other input events. The 5975 * {@link MotionEvent#getSource() source} of the motion event specifies 5976 * the class of input that was received. Implementations of this method 5977 * must examine the bits in the source before processing the event. 5978 * The following code example shows how this is done. 5979 * </p><p> 5980 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5981 * are delivered to the view under the pointer. All other generic motion events are 5982 * delivered to the focused view. 5983 * </p> 5984 * <code> 5985 * public boolean onGenericMotionEvent(MotionEvent event) { 5986 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 5987 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 5988 * // process the joystick movement... 5989 * return true; 5990 * } 5991 * } 5992 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5993 * switch (event.getAction()) { 5994 * case MotionEvent.ACTION_HOVER_MOVE: 5995 * // process the mouse hover movement... 5996 * return true; 5997 * case MotionEvent.ACTION_SCROLL: 5998 * // process the scroll wheel movement... 5999 * return true; 6000 * } 6001 * } 6002 * return super.onGenericMotionEvent(event); 6003 * } 6004 * </code> 6005 * 6006 * @param event The generic motion event being processed. 6007 * @return True if the event was handled, false otherwise. 6008 */ 6009 public boolean onGenericMotionEvent(MotionEvent event) { 6010 return false; 6011 } 6012 6013 /** 6014 * Implement this method to handle hover events. 6015 * <p> 6016 * This method is called whenever a pointer is hovering into, over, or out of the 6017 * bounds of a view and the view is not currently being touched. 6018 * Hover events are represented as pointer events with action 6019 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 6020 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 6021 * </p> 6022 * <ul> 6023 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 6024 * when the pointer enters the bounds of the view.</li> 6025 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 6026 * when the pointer has already entered the bounds of the view and has moved.</li> 6027 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 6028 * when the pointer has exited the bounds of the view or when the pointer is 6029 * about to go down due to a button click, tap, or similar user action that 6030 * causes the view to be touched.</li> 6031 * </ul> 6032 * <p> 6033 * The view should implement this method to return true to indicate that it is 6034 * handling the hover event, such as by changing its drawable state. 6035 * </p><p> 6036 * The default implementation calls {@link #setHovered} to update the hovered state 6037 * of the view when a hover enter or hover exit event is received, if the view 6038 * is enabled and is clickable. The default implementation also sends hover 6039 * accessibility events. 6040 * </p> 6041 * 6042 * @param event The motion event that describes the hover. 6043 * @return True if the view handled the hover event. 6044 * 6045 * @see #isHovered 6046 * @see #setHovered 6047 * @see #onHoverChanged 6048 */ 6049 public boolean onHoverEvent(MotionEvent event) { 6050 // The root view may receive hover (or touch) events that are outside the bounds of 6051 // the window. This code ensures that we only send accessibility events for 6052 // hovers that are actually within the bounds of the root view. 6053 final int action = event.getAction(); 6054 if (!mSendingHoverAccessibilityEvents) { 6055 if ((action == MotionEvent.ACTION_HOVER_ENTER 6056 || action == MotionEvent.ACTION_HOVER_MOVE) 6057 && !hasHoveredChild() 6058 && pointInView(event.getX(), event.getY())) { 6059 mSendingHoverAccessibilityEvents = true; 6060 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 6061 } 6062 } else { 6063 if (action == MotionEvent.ACTION_HOVER_EXIT 6064 || (action == MotionEvent.ACTION_HOVER_MOVE 6065 && !pointInView(event.getX(), event.getY()))) { 6066 mSendingHoverAccessibilityEvents = false; 6067 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 6068 } 6069 } 6070 6071 if (isHoverable()) { 6072 switch (action) { 6073 case MotionEvent.ACTION_HOVER_ENTER: 6074 setHovered(true); 6075 break; 6076 case MotionEvent.ACTION_HOVER_EXIT: 6077 setHovered(false); 6078 break; 6079 } 6080 6081 // Dispatch the event to onGenericMotionEvent before returning true. 6082 // This is to provide compatibility with existing applications that 6083 // handled HOVER_MOVE events in onGenericMotionEvent and that would 6084 // break because of the new default handling for hoverable views 6085 // in onHoverEvent. 6086 // Note that onGenericMotionEvent will be called by default when 6087 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 6088 dispatchGenericMotionEventInternal(event); 6089 return true; 6090 } 6091 return false; 6092 } 6093 6094 /** 6095 * Returns true if the view should handle {@link #onHoverEvent} 6096 * by calling {@link #setHovered} to change its hovered state. 6097 * 6098 * @return True if the view is hoverable. 6099 */ 6100 private boolean isHoverable() { 6101 final int viewFlags = mViewFlags; 6102 //noinspection SimplifiableIfStatement 6103 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6104 return false; 6105 } 6106 6107 return (viewFlags & CLICKABLE) == CLICKABLE 6108 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6109 } 6110 6111 /** 6112 * Returns true if the view is currently hovered. 6113 * 6114 * @return True if the view is currently hovered. 6115 * 6116 * @see #setHovered 6117 * @see #onHoverChanged 6118 */ 6119 @ViewDebug.ExportedProperty 6120 public boolean isHovered() { 6121 return (mPrivateFlags & HOVERED) != 0; 6122 } 6123 6124 /** 6125 * Sets whether the view is currently hovered. 6126 * <p> 6127 * Calling this method also changes the drawable state of the view. This 6128 * enables the view to react to hover by using different drawable resources 6129 * to change its appearance. 6130 * </p><p> 6131 * The {@link #onHoverChanged} method is called when the hovered state changes. 6132 * </p> 6133 * 6134 * @param hovered True if the view is hovered. 6135 * 6136 * @see #isHovered 6137 * @see #onHoverChanged 6138 */ 6139 public void setHovered(boolean hovered) { 6140 if (hovered) { 6141 if ((mPrivateFlags & HOVERED) == 0) { 6142 mPrivateFlags |= HOVERED; 6143 refreshDrawableState(); 6144 onHoverChanged(true); 6145 } 6146 } else { 6147 if ((mPrivateFlags & HOVERED) != 0) { 6148 mPrivateFlags &= ~HOVERED; 6149 refreshDrawableState(); 6150 onHoverChanged(false); 6151 } 6152 } 6153 } 6154 6155 /** 6156 * Implement this method to handle hover state changes. 6157 * <p> 6158 * This method is called whenever the hover state changes as a result of a 6159 * call to {@link #setHovered}. 6160 * </p> 6161 * 6162 * @param hovered The current hover state, as returned by {@link #isHovered}. 6163 * 6164 * @see #isHovered 6165 * @see #setHovered 6166 */ 6167 public void onHoverChanged(boolean hovered) { 6168 } 6169 6170 /** 6171 * Implement this method to handle touch screen motion events. 6172 * 6173 * @param event The motion event. 6174 * @return True if the event was handled, false otherwise. 6175 */ 6176 public boolean onTouchEvent(MotionEvent event) { 6177 final int viewFlags = mViewFlags; 6178 6179 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6180 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 6181 mPrivateFlags &= ~PRESSED; 6182 refreshDrawableState(); 6183 } 6184 // A disabled view that is clickable still consumes the touch 6185 // events, it just doesn't respond to them. 6186 return (((viewFlags & CLICKABLE) == CLICKABLE || 6187 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 6188 } 6189 6190 if (mTouchDelegate != null) { 6191 if (mTouchDelegate.onTouchEvent(event)) { 6192 return true; 6193 } 6194 } 6195 6196 if (((viewFlags & CLICKABLE) == CLICKABLE || 6197 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 6198 switch (event.getAction()) { 6199 case MotionEvent.ACTION_UP: 6200 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 6201 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 6202 // take focus if we don't have it already and we should in 6203 // touch mode. 6204 boolean focusTaken = false; 6205 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 6206 focusTaken = requestFocus(); 6207 } 6208 6209 if (prepressed) { 6210 // The button is being released before we actually 6211 // showed it as pressed. Make it show the pressed 6212 // state now (before scheduling the click) to ensure 6213 // the user sees it. 6214 mPrivateFlags |= PRESSED; 6215 refreshDrawableState(); 6216 } 6217 6218 if (!mHasPerformedLongPress) { 6219 // This is a tap, so remove the longpress check 6220 removeLongPressCallback(); 6221 6222 // Only perform take click actions if we were in the pressed state 6223 if (!focusTaken) { 6224 // Use a Runnable and post this rather than calling 6225 // performClick directly. This lets other visual state 6226 // of the view update before click actions start. 6227 if (mPerformClick == null) { 6228 mPerformClick = new PerformClick(); 6229 } 6230 if (!post(mPerformClick)) { 6231 performClick(); 6232 } 6233 } 6234 } 6235 6236 if (mUnsetPressedState == null) { 6237 mUnsetPressedState = new UnsetPressedState(); 6238 } 6239 6240 if (prepressed) { 6241 postDelayed(mUnsetPressedState, 6242 ViewConfiguration.getPressedStateDuration()); 6243 } else if (!post(mUnsetPressedState)) { 6244 // If the post failed, unpress right now 6245 mUnsetPressedState.run(); 6246 } 6247 removeTapCallback(); 6248 } 6249 break; 6250 6251 case MotionEvent.ACTION_DOWN: 6252 mHasPerformedLongPress = false; 6253 6254 if (performButtonActionOnTouchDown(event)) { 6255 break; 6256 } 6257 6258 // Walk up the hierarchy to determine if we're inside a scrolling container. 6259 boolean isInScrollingContainer = isInScrollingContainer(); 6260 6261 // For views inside a scrolling container, delay the pressed feedback for 6262 // a short period in case this is a scroll. 6263 if (isInScrollingContainer) { 6264 mPrivateFlags |= PREPRESSED; 6265 if (mPendingCheckForTap == null) { 6266 mPendingCheckForTap = new CheckForTap(); 6267 } 6268 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 6269 } else { 6270 // Not inside a scrolling container, so show the feedback right away 6271 mPrivateFlags |= PRESSED; 6272 refreshDrawableState(); 6273 checkForLongClick(0); 6274 } 6275 break; 6276 6277 case MotionEvent.ACTION_CANCEL: 6278 mPrivateFlags &= ~PRESSED; 6279 refreshDrawableState(); 6280 removeTapCallback(); 6281 break; 6282 6283 case MotionEvent.ACTION_MOVE: 6284 final int x = (int) event.getX(); 6285 final int y = (int) event.getY(); 6286 6287 // Be lenient about moving outside of buttons 6288 if (!pointInView(x, y, mTouchSlop)) { 6289 // Outside button 6290 removeTapCallback(); 6291 if ((mPrivateFlags & PRESSED) != 0) { 6292 // Remove any future long press/tap checks 6293 removeLongPressCallback(); 6294 6295 // Need to switch from pressed to not pressed 6296 mPrivateFlags &= ~PRESSED; 6297 refreshDrawableState(); 6298 } 6299 } 6300 break; 6301 } 6302 return true; 6303 } 6304 6305 return false; 6306 } 6307 6308 /** 6309 * @hide 6310 */ 6311 public boolean isInScrollingContainer() { 6312 ViewParent p = getParent(); 6313 while (p != null && p instanceof ViewGroup) { 6314 if (((ViewGroup) p).shouldDelayChildPressedState()) { 6315 return true; 6316 } 6317 p = p.getParent(); 6318 } 6319 return false; 6320 } 6321 6322 /** 6323 * Remove the longpress detection timer. 6324 */ 6325 private void removeLongPressCallback() { 6326 if (mPendingCheckForLongPress != null) { 6327 removeCallbacks(mPendingCheckForLongPress); 6328 } 6329 } 6330 6331 /** 6332 * Remove the pending click action 6333 */ 6334 private void removePerformClickCallback() { 6335 if (mPerformClick != null) { 6336 removeCallbacks(mPerformClick); 6337 } 6338 } 6339 6340 /** 6341 * Remove the prepress detection timer. 6342 */ 6343 private void removeUnsetPressCallback() { 6344 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 6345 setPressed(false); 6346 removeCallbacks(mUnsetPressedState); 6347 } 6348 } 6349 6350 /** 6351 * Remove the tap detection timer. 6352 */ 6353 private void removeTapCallback() { 6354 if (mPendingCheckForTap != null) { 6355 mPrivateFlags &= ~PREPRESSED; 6356 removeCallbacks(mPendingCheckForTap); 6357 } 6358 } 6359 6360 /** 6361 * Cancels a pending long press. Your subclass can use this if you 6362 * want the context menu to come up if the user presses and holds 6363 * at the same place, but you don't want it to come up if they press 6364 * and then move around enough to cause scrolling. 6365 */ 6366 public void cancelLongPress() { 6367 removeLongPressCallback(); 6368 6369 /* 6370 * The prepressed state handled by the tap callback is a display 6371 * construct, but the tap callback will post a long press callback 6372 * less its own timeout. Remove it here. 6373 */ 6374 removeTapCallback(); 6375 } 6376 6377 /** 6378 * Remove the pending callback for sending a 6379 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 6380 */ 6381 private void removeSendViewScrolledAccessibilityEventCallback() { 6382 if (mSendViewScrolledAccessibilityEvent != null) { 6383 removeCallbacks(mSendViewScrolledAccessibilityEvent); 6384 } 6385 } 6386 6387 /** 6388 * Sets the TouchDelegate for this View. 6389 */ 6390 public void setTouchDelegate(TouchDelegate delegate) { 6391 mTouchDelegate = delegate; 6392 } 6393 6394 /** 6395 * Gets the TouchDelegate for this View. 6396 */ 6397 public TouchDelegate getTouchDelegate() { 6398 return mTouchDelegate; 6399 } 6400 6401 /** 6402 * Set flags controlling behavior of this view. 6403 * 6404 * @param flags Constant indicating the value which should be set 6405 * @param mask Constant indicating the bit range that should be changed 6406 */ 6407 void setFlags(int flags, int mask) { 6408 int old = mViewFlags; 6409 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6410 6411 int changed = mViewFlags ^ old; 6412 if (changed == 0) { 6413 return; 6414 } 6415 int privateFlags = mPrivateFlags; 6416 6417 /* Check if the FOCUSABLE bit has changed */ 6418 if (((changed & FOCUSABLE_MASK) != 0) && 6419 ((privateFlags & HAS_BOUNDS) !=0)) { 6420 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6421 && ((privateFlags & FOCUSED) != 0)) { 6422 /* Give up focus if we are no longer focusable */ 6423 clearFocus(); 6424 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6425 && ((privateFlags & FOCUSED) == 0)) { 6426 /* 6427 * Tell the view system that we are now available to take focus 6428 * if no one else already has it. 6429 */ 6430 if (mParent != null) mParent.focusableViewAvailable(this); 6431 } 6432 } 6433 6434 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6435 if ((changed & VISIBILITY_MASK) != 0) { 6436 /* 6437 * If this view is becoming visible, invalidate it in case it changed while 6438 * it was not visible. Marking it drawn ensures that the invalidation will 6439 * go through. 6440 */ 6441 mPrivateFlags |= DRAWN; 6442 invalidate(true); 6443 6444 needGlobalAttributesUpdate(true); 6445 6446 // a view becoming visible is worth notifying the parent 6447 // about in case nothing has focus. even if this specific view 6448 // isn't focusable, it may contain something that is, so let 6449 // the root view try to give this focus if nothing else does. 6450 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6451 mParent.focusableViewAvailable(this); 6452 } 6453 } 6454 } 6455 6456 /* Check if the GONE bit has changed */ 6457 if ((changed & GONE) != 0) { 6458 needGlobalAttributesUpdate(false); 6459 requestLayout(); 6460 6461 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6462 if (hasFocus()) clearFocus(); 6463 destroyDrawingCache(); 6464 if (mParent instanceof View) { 6465 // GONE views noop invalidation, so invalidate the parent 6466 ((View) mParent).invalidate(true); 6467 } 6468 // Mark the view drawn to ensure that it gets invalidated properly the next 6469 // time it is visible and gets invalidated 6470 mPrivateFlags |= DRAWN; 6471 } 6472 if (mAttachInfo != null) { 6473 mAttachInfo.mViewVisibilityChanged = true; 6474 } 6475 } 6476 6477 /* Check if the VISIBLE bit has changed */ 6478 if ((changed & INVISIBLE) != 0) { 6479 needGlobalAttributesUpdate(false); 6480 /* 6481 * If this view is becoming invisible, set the DRAWN flag so that 6482 * the next invalidate() will not be skipped. 6483 */ 6484 mPrivateFlags |= DRAWN; 6485 6486 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6487 // root view becoming invisible shouldn't clear focus 6488 if (getRootView() != this) { 6489 clearFocus(); 6490 } 6491 } 6492 if (mAttachInfo != null) { 6493 mAttachInfo.mViewVisibilityChanged = true; 6494 } 6495 } 6496 6497 if ((changed & VISIBILITY_MASK) != 0) { 6498 if (mParent instanceof ViewGroup) { 6499 ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6500 ((View) mParent).invalidate(true); 6501 } else if (mParent != null) { 6502 mParent.invalidateChild(this, null); 6503 } 6504 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6505 } 6506 6507 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6508 destroyDrawingCache(); 6509 } 6510 6511 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6512 destroyDrawingCache(); 6513 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6514 invalidateParentCaches(); 6515 } 6516 6517 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6518 destroyDrawingCache(); 6519 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6520 } 6521 6522 if ((changed & DRAW_MASK) != 0) { 6523 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6524 if (mBGDrawable != null) { 6525 mPrivateFlags &= ~SKIP_DRAW; 6526 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6527 } else { 6528 mPrivateFlags |= SKIP_DRAW; 6529 } 6530 } else { 6531 mPrivateFlags &= ~SKIP_DRAW; 6532 } 6533 requestLayout(); 6534 invalidate(true); 6535 } 6536 6537 if ((changed & KEEP_SCREEN_ON) != 0) { 6538 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6539 mParent.recomputeViewAttributes(this); 6540 } 6541 } 6542 6543 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6544 requestLayout(); 6545 } 6546 } 6547 6548 /** 6549 * Change the view's z order in the tree, so it's on top of other sibling 6550 * views 6551 */ 6552 public void bringToFront() { 6553 if (mParent != null) { 6554 mParent.bringChildToFront(this); 6555 } 6556 } 6557 6558 /** 6559 * This is called in response to an internal scroll in this view (i.e., the 6560 * view scrolled its own contents). This is typically as a result of 6561 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6562 * called. 6563 * 6564 * @param l Current horizontal scroll origin. 6565 * @param t Current vertical scroll origin. 6566 * @param oldl Previous horizontal scroll origin. 6567 * @param oldt Previous vertical scroll origin. 6568 */ 6569 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6570 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 6571 postSendViewScrolledAccessibilityEventCallback(); 6572 } 6573 6574 mBackgroundSizeChanged = true; 6575 6576 final AttachInfo ai = mAttachInfo; 6577 if (ai != null) { 6578 ai.mViewScrollChanged = true; 6579 } 6580 } 6581 6582 /** 6583 * Interface definition for a callback to be invoked when the layout bounds of a view 6584 * changes due to layout processing. 6585 */ 6586 public interface OnLayoutChangeListener { 6587 /** 6588 * Called when the focus state of a view has changed. 6589 * 6590 * @param v The view whose state has changed. 6591 * @param left The new value of the view's left property. 6592 * @param top The new value of the view's top property. 6593 * @param right The new value of the view's right property. 6594 * @param bottom The new value of the view's bottom property. 6595 * @param oldLeft The previous value of the view's left property. 6596 * @param oldTop The previous value of the view's top property. 6597 * @param oldRight The previous value of the view's right property. 6598 * @param oldBottom The previous value of the view's bottom property. 6599 */ 6600 void onLayoutChange(View v, int left, int top, int right, int bottom, 6601 int oldLeft, int oldTop, int oldRight, int oldBottom); 6602 } 6603 6604 /** 6605 * This is called during layout when the size of this view has changed. If 6606 * you were just added to the view hierarchy, you're called with the old 6607 * values of 0. 6608 * 6609 * @param w Current width of this view. 6610 * @param h Current height of this view. 6611 * @param oldw Old width of this view. 6612 * @param oldh Old height of this view. 6613 */ 6614 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 6615 } 6616 6617 /** 6618 * Called by draw to draw the child views. This may be overridden 6619 * by derived classes to gain control just before its children are drawn 6620 * (but after its own view has been drawn). 6621 * @param canvas the canvas on which to draw the view 6622 */ 6623 protected void dispatchDraw(Canvas canvas) { 6624 } 6625 6626 /** 6627 * Gets the parent of this view. Note that the parent is a 6628 * ViewParent and not necessarily a View. 6629 * 6630 * @return Parent of this view. 6631 */ 6632 public final ViewParent getParent() { 6633 return mParent; 6634 } 6635 6636 /** 6637 * Set the horizontal scrolled position of your view. This will cause a call to 6638 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6639 * invalidated. 6640 * @param value the x position to scroll to 6641 */ 6642 public void setScrollX(int value) { 6643 scrollTo(value, mScrollY); 6644 } 6645 6646 /** 6647 * Set the vertical scrolled position of your view. This will cause a call to 6648 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6649 * invalidated. 6650 * @param value the y position to scroll to 6651 */ 6652 public void setScrollY(int value) { 6653 scrollTo(mScrollX, value); 6654 } 6655 6656 /** 6657 * Return the scrolled left position of this view. This is the left edge of 6658 * the displayed part of your view. You do not need to draw any pixels 6659 * farther left, since those are outside of the frame of your view on 6660 * screen. 6661 * 6662 * @return The left edge of the displayed part of your view, in pixels. 6663 */ 6664 public final int getScrollX() { 6665 return mScrollX; 6666 } 6667 6668 /** 6669 * Return the scrolled top position of this view. This is the top edge of 6670 * the displayed part of your view. You do not need to draw any pixels above 6671 * it, since those are outside of the frame of your view on screen. 6672 * 6673 * @return The top edge of the displayed part of your view, in pixels. 6674 */ 6675 public final int getScrollY() { 6676 return mScrollY; 6677 } 6678 6679 /** 6680 * Return the width of the your view. 6681 * 6682 * @return The width of your view, in pixels. 6683 */ 6684 @ViewDebug.ExportedProperty(category = "layout") 6685 public final int getWidth() { 6686 return mRight - mLeft; 6687 } 6688 6689 /** 6690 * Return the height of your view. 6691 * 6692 * @return The height of your view, in pixels. 6693 */ 6694 @ViewDebug.ExportedProperty(category = "layout") 6695 public final int getHeight() { 6696 return mBottom - mTop; 6697 } 6698 6699 /** 6700 * Return the visible drawing bounds of your view. Fills in the output 6701 * rectangle with the values from getScrollX(), getScrollY(), 6702 * getWidth(), and getHeight(). 6703 * 6704 * @param outRect The (scrolled) drawing bounds of the view. 6705 */ 6706 public void getDrawingRect(Rect outRect) { 6707 outRect.left = mScrollX; 6708 outRect.top = mScrollY; 6709 outRect.right = mScrollX + (mRight - mLeft); 6710 outRect.bottom = mScrollY + (mBottom - mTop); 6711 } 6712 6713 /** 6714 * Like {@link #getMeasuredWidthAndState()}, but only returns the 6715 * raw width component (that is the result is masked by 6716 * {@link #MEASURED_SIZE_MASK}). 6717 * 6718 * @return The raw measured width of this view. 6719 */ 6720 public final int getMeasuredWidth() { 6721 return mMeasuredWidth & MEASURED_SIZE_MASK; 6722 } 6723 6724 /** 6725 * Return the full width measurement information for this view as computed 6726 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6727 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6728 * This should be used during measurement and layout calculations only. Use 6729 * {@link #getWidth()} to see how wide a view is after layout. 6730 * 6731 * @return The measured width of this view as a bit mask. 6732 */ 6733 public final int getMeasuredWidthAndState() { 6734 return mMeasuredWidth; 6735 } 6736 6737 /** 6738 * Like {@link #getMeasuredHeightAndState()}, but only returns the 6739 * raw width component (that is the result is masked by 6740 * {@link #MEASURED_SIZE_MASK}). 6741 * 6742 * @return The raw measured height of this view. 6743 */ 6744 public final int getMeasuredHeight() { 6745 return mMeasuredHeight & MEASURED_SIZE_MASK; 6746 } 6747 6748 /** 6749 * Return the full height measurement information for this view as computed 6750 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6751 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6752 * This should be used during measurement and layout calculations only. Use 6753 * {@link #getHeight()} to see how wide a view is after layout. 6754 * 6755 * @return The measured width of this view as a bit mask. 6756 */ 6757 public final int getMeasuredHeightAndState() { 6758 return mMeasuredHeight; 6759 } 6760 6761 /** 6762 * Return only the state bits of {@link #getMeasuredWidthAndState()} 6763 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 6764 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 6765 * and the height component is at the shifted bits 6766 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 6767 */ 6768 public final int getMeasuredState() { 6769 return (mMeasuredWidth&MEASURED_STATE_MASK) 6770 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 6771 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 6772 } 6773 6774 /** 6775 * The transform matrix of this view, which is calculated based on the current 6776 * roation, scale, and pivot properties. 6777 * 6778 * @see #getRotation() 6779 * @see #getScaleX() 6780 * @see #getScaleY() 6781 * @see #getPivotX() 6782 * @see #getPivotY() 6783 * @return The current transform matrix for the view 6784 */ 6785 public Matrix getMatrix() { 6786 updateMatrix(); 6787 return mMatrix; 6788 } 6789 6790 /** 6791 * Utility function to determine if the value is far enough away from zero to be 6792 * considered non-zero. 6793 * @param value A floating point value to check for zero-ness 6794 * @return whether the passed-in value is far enough away from zero to be considered non-zero 6795 */ 6796 private static boolean nonzero(float value) { 6797 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 6798 } 6799 6800 /** 6801 * Returns true if the transform matrix is the identity matrix. 6802 * Recomputes the matrix if necessary. 6803 * 6804 * @return True if the transform matrix is the identity matrix, false otherwise. 6805 */ 6806 final boolean hasIdentityMatrix() { 6807 updateMatrix(); 6808 return mMatrixIsIdentity; 6809 } 6810 6811 /** 6812 * Recomputes the transform matrix if necessary. 6813 */ 6814 private void updateMatrix() { 6815 if (mMatrixDirty) { 6816 // transform-related properties have changed since the last time someone 6817 // asked for the matrix; recalculate it with the current values 6818 6819 // Figure out if we need to update the pivot point 6820 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6821 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 6822 mPrevWidth = mRight - mLeft; 6823 mPrevHeight = mBottom - mTop; 6824 mPivotX = mPrevWidth / 2f; 6825 mPivotY = mPrevHeight / 2f; 6826 } 6827 } 6828 mMatrix.reset(); 6829 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 6830 mMatrix.setTranslate(mTranslationX, mTranslationY); 6831 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 6832 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6833 } else { 6834 if (mCamera == null) { 6835 mCamera = new Camera(); 6836 matrix3D = new Matrix(); 6837 } 6838 mCamera.save(); 6839 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6840 mCamera.rotate(mRotationX, mRotationY, -mRotation); 6841 mCamera.getMatrix(matrix3D); 6842 matrix3D.preTranslate(-mPivotX, -mPivotY); 6843 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 6844 mMatrix.postConcat(matrix3D); 6845 mCamera.restore(); 6846 } 6847 mMatrixDirty = false; 6848 mMatrixIsIdentity = mMatrix.isIdentity(); 6849 mInverseMatrixDirty = true; 6850 } 6851 } 6852 6853 /** 6854 * Utility method to retrieve the inverse of the current mMatrix property. 6855 * We cache the matrix to avoid recalculating it when transform properties 6856 * have not changed. 6857 * 6858 * @return The inverse of the current matrix of this view. 6859 */ 6860 final Matrix getInverseMatrix() { 6861 updateMatrix(); 6862 if (mInverseMatrixDirty) { 6863 if (mInverseMatrix == null) { 6864 mInverseMatrix = new Matrix(); 6865 } 6866 mMatrix.invert(mInverseMatrix); 6867 mInverseMatrixDirty = false; 6868 } 6869 return mInverseMatrix; 6870 } 6871 6872 /** 6873 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 6874 * views are drawn) from the camera to this view. The camera's distance 6875 * affects 3D transformations, for instance rotations around the X and Y 6876 * axis. If the rotationX or rotationY properties are changed and this view is 6877 * large (more than half the size of the screen), it is recommended to always 6878 * use a camera distance that's greater than the height (X axis rotation) or 6879 * the width (Y axis rotation) of this view.</p> 6880 * 6881 * <p>The distance of the camera from the view plane can have an affect on the 6882 * perspective distortion of the view when it is rotated around the x or y axis. 6883 * For example, a large distance will result in a large viewing angle, and there 6884 * will not be much perspective distortion of the view as it rotates. A short 6885 * distance may cause much more perspective distortion upon rotation, and can 6886 * also result in some drawing artifacts if the rotated view ends up partially 6887 * behind the camera (which is why the recommendation is to use a distance at 6888 * least as far as the size of the view, if the view is to be rotated.)</p> 6889 * 6890 * <p>The distance is expressed in "depth pixels." The default distance depends 6891 * on the screen density. For instance, on a medium density display, the 6892 * default distance is 1280. On a high density display, the default distance 6893 * is 1920.</p> 6894 * 6895 * <p>If you want to specify a distance that leads to visually consistent 6896 * results across various densities, use the following formula:</p> 6897 * <pre> 6898 * float scale = context.getResources().getDisplayMetrics().density; 6899 * view.setCameraDistance(distance * scale); 6900 * </pre> 6901 * 6902 * <p>The density scale factor of a high density display is 1.5, 6903 * and 1920 = 1280 * 1.5.</p> 6904 * 6905 * @param distance The distance in "depth pixels", if negative the opposite 6906 * value is used 6907 * 6908 * @see #setRotationX(float) 6909 * @see #setRotationY(float) 6910 */ 6911 public void setCameraDistance(float distance) { 6912 invalidateParentCaches(); 6913 invalidate(false); 6914 6915 final float dpi = mResources.getDisplayMetrics().densityDpi; 6916 if (mCamera == null) { 6917 mCamera = new Camera(); 6918 matrix3D = new Matrix(); 6919 } 6920 6921 mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 6922 mMatrixDirty = true; 6923 6924 invalidate(false); 6925 } 6926 6927 /** 6928 * The degrees that the view is rotated around the pivot point. 6929 * 6930 * @see #setRotation(float) 6931 * @see #getPivotX() 6932 * @see #getPivotY() 6933 * 6934 * @return The degrees of rotation. 6935 */ 6936 public float getRotation() { 6937 return mRotation; 6938 } 6939 6940 /** 6941 * Sets the degrees that the view is rotated around the pivot point. Increasing values 6942 * result in clockwise rotation. 6943 * 6944 * @param rotation The degrees of rotation. 6945 * 6946 * @see #getRotation() 6947 * @see #getPivotX() 6948 * @see #getPivotY() 6949 * @see #setRotationX(float) 6950 * @see #setRotationY(float) 6951 * 6952 * @attr ref android.R.styleable#View_rotation 6953 */ 6954 public void setRotation(float rotation) { 6955 if (mRotation != rotation) { 6956 invalidateParentCaches(); 6957 // Double-invalidation is necessary to capture view's old and new areas 6958 invalidate(false); 6959 mRotation = rotation; 6960 mMatrixDirty = true; 6961 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6962 invalidate(false); 6963 } 6964 } 6965 6966 /** 6967 * The degrees that the view is rotated around the vertical axis through the pivot point. 6968 * 6969 * @see #getPivotX() 6970 * @see #getPivotY() 6971 * @see #setRotationY(float) 6972 * 6973 * @return The degrees of Y rotation. 6974 */ 6975 public float getRotationY() { 6976 return mRotationY; 6977 } 6978 6979 /** 6980 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 6981 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 6982 * down the y axis. 6983 * 6984 * When rotating large views, it is recommended to adjust the camera distance 6985 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 6986 * 6987 * @param rotationY The degrees of Y rotation. 6988 * 6989 * @see #getRotationY() 6990 * @see #getPivotX() 6991 * @see #getPivotY() 6992 * @see #setRotation(float) 6993 * @see #setRotationX(float) 6994 * @see #setCameraDistance(float) 6995 * 6996 * @attr ref android.R.styleable#View_rotationY 6997 */ 6998 public void setRotationY(float rotationY) { 6999 if (mRotationY != rotationY) { 7000 invalidateParentCaches(); 7001 // Double-invalidation is necessary to capture view's old and new areas 7002 invalidate(false); 7003 mRotationY = rotationY; 7004 mMatrixDirty = true; 7005 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7006 invalidate(false); 7007 } 7008 } 7009 7010 /** 7011 * The degrees that the view is rotated around the horizontal axis through the pivot point. 7012 * 7013 * @see #getPivotX() 7014 * @see #getPivotY() 7015 * @see #setRotationX(float) 7016 * 7017 * @return The degrees of X rotation. 7018 */ 7019 public float getRotationX() { 7020 return mRotationX; 7021 } 7022 7023 /** 7024 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 7025 * Increasing values result in clockwise rotation from the viewpoint of looking down the 7026 * x axis. 7027 * 7028 * When rotating large views, it is recommended to adjust the camera distance 7029 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7030 * 7031 * @param rotationX The degrees of X rotation. 7032 * 7033 * @see #getRotationX() 7034 * @see #getPivotX() 7035 * @see #getPivotY() 7036 * @see #setRotation(float) 7037 * @see #setRotationY(float) 7038 * @see #setCameraDistance(float) 7039 * 7040 * @attr ref android.R.styleable#View_rotationX 7041 */ 7042 public void setRotationX(float rotationX) { 7043 if (mRotationX != rotationX) { 7044 invalidateParentCaches(); 7045 // Double-invalidation is necessary to capture view's old and new areas 7046 invalidate(false); 7047 mRotationX = rotationX; 7048 mMatrixDirty = true; 7049 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7050 invalidate(false); 7051 } 7052 } 7053 7054 /** 7055 * The amount that the view is scaled in x around the pivot point, as a proportion of 7056 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 7057 * 7058 * <p>By default, this is 1.0f. 7059 * 7060 * @see #getPivotX() 7061 * @see #getPivotY() 7062 * @return The scaling factor. 7063 */ 7064 public float getScaleX() { 7065 return mScaleX; 7066 } 7067 7068 /** 7069 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 7070 * the view's unscaled width. A value of 1 means that no scaling is applied. 7071 * 7072 * @param scaleX The scaling factor. 7073 * @see #getPivotX() 7074 * @see #getPivotY() 7075 * 7076 * @attr ref android.R.styleable#View_scaleX 7077 */ 7078 public void setScaleX(float scaleX) { 7079 if (mScaleX != scaleX) { 7080 invalidateParentCaches(); 7081 // Double-invalidation is necessary to capture view's old and new areas 7082 invalidate(false); 7083 mScaleX = scaleX; 7084 mMatrixDirty = true; 7085 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7086 invalidate(false); 7087 } 7088 } 7089 7090 /** 7091 * The amount that the view is scaled in y around the pivot point, as a proportion of 7092 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 7093 * 7094 * <p>By default, this is 1.0f. 7095 * 7096 * @see #getPivotX() 7097 * @see #getPivotY() 7098 * @return The scaling factor. 7099 */ 7100 public float getScaleY() { 7101 return mScaleY; 7102 } 7103 7104 /** 7105 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 7106 * the view's unscaled width. A value of 1 means that no scaling is applied. 7107 * 7108 * @param scaleY The scaling factor. 7109 * @see #getPivotX() 7110 * @see #getPivotY() 7111 * 7112 * @attr ref android.R.styleable#View_scaleY 7113 */ 7114 public void setScaleY(float scaleY) { 7115 if (mScaleY != scaleY) { 7116 invalidateParentCaches(); 7117 // Double-invalidation is necessary to capture view's old and new areas 7118 invalidate(false); 7119 mScaleY = scaleY; 7120 mMatrixDirty = true; 7121 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7122 invalidate(false); 7123 } 7124 } 7125 7126 /** 7127 * The x location of the point around which the view is {@link #setRotation(float) rotated} 7128 * and {@link #setScaleX(float) scaled}. 7129 * 7130 * @see #getRotation() 7131 * @see #getScaleX() 7132 * @see #getScaleY() 7133 * @see #getPivotY() 7134 * @return The x location of the pivot point. 7135 */ 7136 public float getPivotX() { 7137 return mPivotX; 7138 } 7139 7140 /** 7141 * Sets the x location of the point around which the view is 7142 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 7143 * By default, the pivot point is centered on the object. 7144 * Setting this property disables this behavior and causes the view to use only the 7145 * explicitly set pivotX and pivotY values. 7146 * 7147 * @param pivotX The x location of the pivot point. 7148 * @see #getRotation() 7149 * @see #getScaleX() 7150 * @see #getScaleY() 7151 * @see #getPivotY() 7152 * 7153 * @attr ref android.R.styleable#View_transformPivotX 7154 */ 7155 public void setPivotX(float pivotX) { 7156 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7157 if (mPivotX != pivotX) { 7158 invalidateParentCaches(); 7159 // Double-invalidation is necessary to capture view's old and new areas 7160 invalidate(false); 7161 mPivotX = pivotX; 7162 mMatrixDirty = true; 7163 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7164 invalidate(false); 7165 } 7166 } 7167 7168 /** 7169 * The y location of the point around which the view is {@link #setRotation(float) rotated} 7170 * and {@link #setScaleY(float) scaled}. 7171 * 7172 * @see #getRotation() 7173 * @see #getScaleX() 7174 * @see #getScaleY() 7175 * @see #getPivotY() 7176 * @return The y location of the pivot point. 7177 */ 7178 public float getPivotY() { 7179 return mPivotY; 7180 } 7181 7182 /** 7183 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 7184 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 7185 * Setting this property disables this behavior and causes the view to use only the 7186 * explicitly set pivotX and pivotY values. 7187 * 7188 * @param pivotY The y location of the pivot point. 7189 * @see #getRotation() 7190 * @see #getScaleX() 7191 * @see #getScaleY() 7192 * @see #getPivotY() 7193 * 7194 * @attr ref android.R.styleable#View_transformPivotY 7195 */ 7196 public void setPivotY(float pivotY) { 7197 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7198 if (mPivotY != pivotY) { 7199 invalidateParentCaches(); 7200 // Double-invalidation is necessary to capture view's old and new areas 7201 invalidate(false); 7202 mPivotY = pivotY; 7203 mMatrixDirty = true; 7204 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7205 invalidate(false); 7206 } 7207 } 7208 7209 /** 7210 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 7211 * completely transparent and 1 means the view is completely opaque. 7212 * 7213 * <p>By default this is 1.0f. 7214 * @return The opacity of the view. 7215 */ 7216 public float getAlpha() { 7217 return mAlpha; 7218 } 7219 7220 /** 7221 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 7222 * completely transparent and 1 means the view is completely opaque.</p> 7223 * 7224 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 7225 * responsible for applying the opacity itself. Otherwise, calling this method is 7226 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 7227 * setting a hardware layer.</p> 7228 * 7229 * @param alpha The opacity of the view. 7230 * 7231 * @see #setLayerType(int, android.graphics.Paint) 7232 * 7233 * @attr ref android.R.styleable#View_alpha 7234 */ 7235 public void setAlpha(float alpha) { 7236 mAlpha = alpha; 7237 invalidateParentCaches(); 7238 if (onSetAlpha((int) (alpha * 255))) { 7239 mPrivateFlags |= ALPHA_SET; 7240 // subclass is handling alpha - don't optimize rendering cache invalidation 7241 invalidate(true); 7242 } else { 7243 mPrivateFlags &= ~ALPHA_SET; 7244 invalidate(false); 7245 } 7246 } 7247 7248 /** 7249 * Faster version of setAlpha() which performs the same steps except there are 7250 * no calls to invalidate(). The caller of this function should perform proper invalidation 7251 * on the parent and this object. The return value indicates whether the subclass handles 7252 * alpha (the return value for onSetAlpha()). 7253 * 7254 * @param alpha The new value for the alpha property 7255 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) 7256 */ 7257 boolean setAlphaNoInvalidation(float alpha) { 7258 mAlpha = alpha; 7259 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 7260 if (subclassHandlesAlpha) { 7261 mPrivateFlags |= ALPHA_SET; 7262 } else { 7263 mPrivateFlags &= ~ALPHA_SET; 7264 } 7265 return subclassHandlesAlpha; 7266 } 7267 7268 /** 7269 * Top position of this view relative to its parent. 7270 * 7271 * @return The top of this view, in pixels. 7272 */ 7273 @ViewDebug.CapturedViewProperty 7274 public final int getTop() { 7275 return mTop; 7276 } 7277 7278 /** 7279 * Sets the top position of this view relative to its parent. This method is meant to be called 7280 * by the layout system and should not generally be called otherwise, because the property 7281 * may be changed at any time by the layout. 7282 * 7283 * @param top The top of this view, in pixels. 7284 */ 7285 public final void setTop(int top) { 7286 if (top != mTop) { 7287 updateMatrix(); 7288 if (mMatrixIsIdentity) { 7289 if (mAttachInfo != null) { 7290 int minTop; 7291 int yLoc; 7292 if (top < mTop) { 7293 minTop = top; 7294 yLoc = top - mTop; 7295 } else { 7296 minTop = mTop; 7297 yLoc = 0; 7298 } 7299 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 7300 } 7301 } else { 7302 // Double-invalidation is necessary to capture view's old and new areas 7303 invalidate(true); 7304 } 7305 7306 int width = mRight - mLeft; 7307 int oldHeight = mBottom - mTop; 7308 7309 mTop = top; 7310 7311 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7312 7313 if (!mMatrixIsIdentity) { 7314 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7315 // A change in dimension means an auto-centered pivot point changes, too 7316 mMatrixDirty = true; 7317 } 7318 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7319 invalidate(true); 7320 } 7321 mBackgroundSizeChanged = true; 7322 invalidateParentIfNeeded(); 7323 } 7324 } 7325 7326 /** 7327 * Bottom position of this view relative to its parent. 7328 * 7329 * @return The bottom of this view, in pixels. 7330 */ 7331 @ViewDebug.CapturedViewProperty 7332 public final int getBottom() { 7333 return mBottom; 7334 } 7335 7336 /** 7337 * True if this view has changed since the last time being drawn. 7338 * 7339 * @return The dirty state of this view. 7340 */ 7341 public boolean isDirty() { 7342 return (mPrivateFlags & DIRTY_MASK) != 0; 7343 } 7344 7345 /** 7346 * Sets the bottom position of this view relative to its parent. This method is meant to be 7347 * called by the layout system and should not generally be called otherwise, because the 7348 * property may be changed at any time by the layout. 7349 * 7350 * @param bottom The bottom of this view, in pixels. 7351 */ 7352 public final void setBottom(int bottom) { 7353 if (bottom != mBottom) { 7354 updateMatrix(); 7355 if (mMatrixIsIdentity) { 7356 if (mAttachInfo != null) { 7357 int maxBottom; 7358 if (bottom < mBottom) { 7359 maxBottom = mBottom; 7360 } else { 7361 maxBottom = bottom; 7362 } 7363 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 7364 } 7365 } else { 7366 // Double-invalidation is necessary to capture view's old and new areas 7367 invalidate(true); 7368 } 7369 7370 int width = mRight - mLeft; 7371 int oldHeight = mBottom - mTop; 7372 7373 mBottom = bottom; 7374 7375 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7376 7377 if (!mMatrixIsIdentity) { 7378 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7379 // A change in dimension means an auto-centered pivot point changes, too 7380 mMatrixDirty = true; 7381 } 7382 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7383 invalidate(true); 7384 } 7385 mBackgroundSizeChanged = true; 7386 invalidateParentIfNeeded(); 7387 } 7388 } 7389 7390 /** 7391 * Left position of this view relative to its parent. 7392 * 7393 * @return The left edge of this view, in pixels. 7394 */ 7395 @ViewDebug.CapturedViewProperty 7396 public final int getLeft() { 7397 return mLeft; 7398 } 7399 7400 /** 7401 * Sets the left position of this view relative to its parent. This method is meant to be called 7402 * by the layout system and should not generally be called otherwise, because the property 7403 * may be changed at any time by the layout. 7404 * 7405 * @param left The bottom of this view, in pixels. 7406 */ 7407 public final void setLeft(int left) { 7408 if (left != mLeft) { 7409 updateMatrix(); 7410 if (mMatrixIsIdentity) { 7411 if (mAttachInfo != null) { 7412 int minLeft; 7413 int xLoc; 7414 if (left < mLeft) { 7415 minLeft = left; 7416 xLoc = left - mLeft; 7417 } else { 7418 minLeft = mLeft; 7419 xLoc = 0; 7420 } 7421 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7422 } 7423 } else { 7424 // Double-invalidation is necessary to capture view's old and new areas 7425 invalidate(true); 7426 } 7427 7428 int oldWidth = mRight - mLeft; 7429 int height = mBottom - mTop; 7430 7431 mLeft = left; 7432 7433 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7434 7435 if (!mMatrixIsIdentity) { 7436 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7437 // A change in dimension means an auto-centered pivot point changes, too 7438 mMatrixDirty = true; 7439 } 7440 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7441 invalidate(true); 7442 } 7443 mBackgroundSizeChanged = true; 7444 invalidateParentIfNeeded(); 7445 } 7446 } 7447 7448 /** 7449 * Right position of this view relative to its parent. 7450 * 7451 * @return The right edge of this view, in pixels. 7452 */ 7453 @ViewDebug.CapturedViewProperty 7454 public final int getRight() { 7455 return mRight; 7456 } 7457 7458 /** 7459 * Sets the right position of this view relative to its parent. This method is meant to be called 7460 * by the layout system and should not generally be called otherwise, because the property 7461 * may be changed at any time by the layout. 7462 * 7463 * @param right The bottom of this view, in pixels. 7464 */ 7465 public final void setRight(int right) { 7466 if (right != mRight) { 7467 updateMatrix(); 7468 if (mMatrixIsIdentity) { 7469 if (mAttachInfo != null) { 7470 int maxRight; 7471 if (right < mRight) { 7472 maxRight = mRight; 7473 } else { 7474 maxRight = right; 7475 } 7476 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7477 } 7478 } else { 7479 // Double-invalidation is necessary to capture view's old and new areas 7480 invalidate(true); 7481 } 7482 7483 int oldWidth = mRight - mLeft; 7484 int height = mBottom - mTop; 7485 7486 mRight = right; 7487 7488 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7489 7490 if (!mMatrixIsIdentity) { 7491 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7492 // A change in dimension means an auto-centered pivot point changes, too 7493 mMatrixDirty = true; 7494 } 7495 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7496 invalidate(true); 7497 } 7498 mBackgroundSizeChanged = true; 7499 invalidateParentIfNeeded(); 7500 } 7501 } 7502 7503 /** 7504 * The visual x position of this view, in pixels. This is equivalent to the 7505 * {@link #setTranslationX(float) translationX} property plus the current 7506 * {@link #getLeft() left} property. 7507 * 7508 * @return The visual x position of this view, in pixels. 7509 */ 7510 public float getX() { 7511 return mLeft + mTranslationX; 7512 } 7513 7514 /** 7515 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 7516 * {@link #setTranslationX(float) translationX} property to be the difference between 7517 * the x value passed in and the current {@link #getLeft() left} property. 7518 * 7519 * @param x The visual x position of this view, in pixels. 7520 */ 7521 public void setX(float x) { 7522 setTranslationX(x - mLeft); 7523 } 7524 7525 /** 7526 * The visual y position of this view, in pixels. This is equivalent to the 7527 * {@link #setTranslationY(float) translationY} property plus the current 7528 * {@link #getTop() top} property. 7529 * 7530 * @return The visual y position of this view, in pixels. 7531 */ 7532 public float getY() { 7533 return mTop + mTranslationY; 7534 } 7535 7536 /** 7537 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 7538 * {@link #setTranslationY(float) translationY} property to be the difference between 7539 * the y value passed in and the current {@link #getTop() top} property. 7540 * 7541 * @param y The visual y position of this view, in pixels. 7542 */ 7543 public void setY(float y) { 7544 setTranslationY(y - mTop); 7545 } 7546 7547 7548 /** 7549 * The horizontal location of this view relative to its {@link #getLeft() left} position. 7550 * This position is post-layout, in addition to wherever the object's 7551 * layout placed it. 7552 * 7553 * @return The horizontal position of this view relative to its left position, in pixels. 7554 */ 7555 public float getTranslationX() { 7556 return mTranslationX; 7557 } 7558 7559 /** 7560 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 7561 * This effectively positions the object post-layout, in addition to wherever the object's 7562 * layout placed it. 7563 * 7564 * @param translationX The horizontal position of this view relative to its left position, 7565 * in pixels. 7566 * 7567 * @attr ref android.R.styleable#View_translationX 7568 */ 7569 public void setTranslationX(float translationX) { 7570 if (mTranslationX != translationX) { 7571 invalidateParentCaches(); 7572 // Double-invalidation is necessary to capture view's old and new areas 7573 invalidate(false); 7574 mTranslationX = translationX; 7575 mMatrixDirty = true; 7576 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7577 invalidate(false); 7578 } 7579 } 7580 7581 /** 7582 * The horizontal location of this view relative to its {@link #getTop() top} position. 7583 * This position is post-layout, in addition to wherever the object's 7584 * layout placed it. 7585 * 7586 * @return The vertical position of this view relative to its top position, 7587 * in pixels. 7588 */ 7589 public float getTranslationY() { 7590 return mTranslationY; 7591 } 7592 7593 /** 7594 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 7595 * This effectively positions the object post-layout, in addition to wherever the object's 7596 * layout placed it. 7597 * 7598 * @param translationY The vertical position of this view relative to its top position, 7599 * in pixels. 7600 * 7601 * @attr ref android.R.styleable#View_translationY 7602 */ 7603 public void setTranslationY(float translationY) { 7604 if (mTranslationY != translationY) { 7605 invalidateParentCaches(); 7606 // Double-invalidation is necessary to capture view's old and new areas 7607 invalidate(false); 7608 mTranslationY = translationY; 7609 mMatrixDirty = true; 7610 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7611 invalidate(false); 7612 } 7613 } 7614 7615 /** 7616 * @hide 7617 */ 7618 public void setFastTranslationX(float x) { 7619 mTranslationX = x; 7620 mMatrixDirty = true; 7621 } 7622 7623 /** 7624 * @hide 7625 */ 7626 public void setFastTranslationY(float y) { 7627 mTranslationY = y; 7628 mMatrixDirty = true; 7629 } 7630 7631 /** 7632 * @hide 7633 */ 7634 public void setFastX(float x) { 7635 mTranslationX = x - mLeft; 7636 mMatrixDirty = true; 7637 } 7638 7639 /** 7640 * @hide 7641 */ 7642 public void setFastY(float y) { 7643 mTranslationY = y - mTop; 7644 mMatrixDirty = true; 7645 } 7646 7647 /** 7648 * @hide 7649 */ 7650 public void setFastScaleX(float x) { 7651 mScaleX = x; 7652 mMatrixDirty = true; 7653 } 7654 7655 /** 7656 * @hide 7657 */ 7658 public void setFastScaleY(float y) { 7659 mScaleY = y; 7660 mMatrixDirty = true; 7661 } 7662 7663 /** 7664 * @hide 7665 */ 7666 public void setFastAlpha(float alpha) { 7667 mAlpha = alpha; 7668 } 7669 7670 /** 7671 * @hide 7672 */ 7673 public void setFastRotationY(float y) { 7674 mRotationY = y; 7675 mMatrixDirty = true; 7676 } 7677 7678 /** 7679 * Hit rectangle in parent's coordinates 7680 * 7681 * @param outRect The hit rectangle of the view. 7682 */ 7683 public void getHitRect(Rect outRect) { 7684 updateMatrix(); 7685 if (mMatrixIsIdentity || mAttachInfo == null) { 7686 outRect.set(mLeft, mTop, mRight, mBottom); 7687 } else { 7688 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 7689 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 7690 mMatrix.mapRect(tmpRect); 7691 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 7692 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 7693 } 7694 } 7695 7696 /** 7697 * Determines whether the given point, in local coordinates is inside the view. 7698 */ 7699 /*package*/ final boolean pointInView(float localX, float localY) { 7700 return localX >= 0 && localX < (mRight - mLeft) 7701 && localY >= 0 && localY < (mBottom - mTop); 7702 } 7703 7704 /** 7705 * Utility method to determine whether the given point, in local coordinates, 7706 * is inside the view, where the area of the view is expanded by the slop factor. 7707 * This method is called while processing touch-move events to determine if the event 7708 * is still within the view. 7709 */ 7710 private boolean pointInView(float localX, float localY, float slop) { 7711 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 7712 localY < ((mBottom - mTop) + slop); 7713 } 7714 7715 /** 7716 * When a view has focus and the user navigates away from it, the next view is searched for 7717 * starting from the rectangle filled in by this method. 7718 * 7719 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 7720 * of the view. However, if your view maintains some idea of internal selection, 7721 * such as a cursor, or a selected row or column, you should override this method and 7722 * fill in a more specific rectangle. 7723 * 7724 * @param r The rectangle to fill in, in this view's coordinates. 7725 */ 7726 public void getFocusedRect(Rect r) { 7727 getDrawingRect(r); 7728 } 7729 7730 /** 7731 * If some part of this view is not clipped by any of its parents, then 7732 * return that area in r in global (root) coordinates. To convert r to local 7733 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 7734 * -globalOffset.y)) If the view is completely clipped or translated out, 7735 * return false. 7736 * 7737 * @param r If true is returned, r holds the global coordinates of the 7738 * visible portion of this view. 7739 * @param globalOffset If true is returned, globalOffset holds the dx,dy 7740 * between this view and its root. globalOffet may be null. 7741 * @return true if r is non-empty (i.e. part of the view is visible at the 7742 * root level. 7743 */ 7744 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 7745 int width = mRight - mLeft; 7746 int height = mBottom - mTop; 7747 if (width > 0 && height > 0) { 7748 r.set(0, 0, width, height); 7749 if (globalOffset != null) { 7750 globalOffset.set(-mScrollX, -mScrollY); 7751 } 7752 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 7753 } 7754 return false; 7755 } 7756 7757 public final boolean getGlobalVisibleRect(Rect r) { 7758 return getGlobalVisibleRect(r, null); 7759 } 7760 7761 public final boolean getLocalVisibleRect(Rect r) { 7762 Point offset = new Point(); 7763 if (getGlobalVisibleRect(r, offset)) { 7764 r.offset(-offset.x, -offset.y); // make r local 7765 return true; 7766 } 7767 return false; 7768 } 7769 7770 /** 7771 * Offset this view's vertical location by the specified number of pixels. 7772 * 7773 * @param offset the number of pixels to offset the view by 7774 */ 7775 public void offsetTopAndBottom(int offset) { 7776 if (offset != 0) { 7777 updateMatrix(); 7778 if (mMatrixIsIdentity) { 7779 final ViewParent p = mParent; 7780 if (p != null && mAttachInfo != null) { 7781 final Rect r = mAttachInfo.mTmpInvalRect; 7782 int minTop; 7783 int maxBottom; 7784 int yLoc; 7785 if (offset < 0) { 7786 minTop = mTop + offset; 7787 maxBottom = mBottom; 7788 yLoc = offset; 7789 } else { 7790 minTop = mTop; 7791 maxBottom = mBottom + offset; 7792 yLoc = 0; 7793 } 7794 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 7795 p.invalidateChild(this, r); 7796 } 7797 } else { 7798 invalidate(false); 7799 } 7800 7801 mTop += offset; 7802 mBottom += offset; 7803 7804 if (!mMatrixIsIdentity) { 7805 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7806 invalidate(false); 7807 } 7808 invalidateParentIfNeeded(); 7809 } 7810 } 7811 7812 /** 7813 * Offset this view's horizontal location by the specified amount of pixels. 7814 * 7815 * @param offset the numer of pixels to offset the view by 7816 */ 7817 public void offsetLeftAndRight(int offset) { 7818 if (offset != 0) { 7819 updateMatrix(); 7820 if (mMatrixIsIdentity) { 7821 final ViewParent p = mParent; 7822 if (p != null && mAttachInfo != null) { 7823 final Rect r = mAttachInfo.mTmpInvalRect; 7824 int minLeft; 7825 int maxRight; 7826 if (offset < 0) { 7827 minLeft = mLeft + offset; 7828 maxRight = mRight; 7829 } else { 7830 minLeft = mLeft; 7831 maxRight = mRight + offset; 7832 } 7833 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 7834 p.invalidateChild(this, r); 7835 } 7836 } else { 7837 invalidate(false); 7838 } 7839 7840 mLeft += offset; 7841 mRight += offset; 7842 7843 if (!mMatrixIsIdentity) { 7844 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7845 invalidate(false); 7846 } 7847 invalidateParentIfNeeded(); 7848 } 7849 } 7850 7851 /** 7852 * Get the LayoutParams associated with this view. All views should have 7853 * layout parameters. These supply parameters to the <i>parent</i> of this 7854 * view specifying how it should be arranged. There are many subclasses of 7855 * ViewGroup.LayoutParams, and these correspond to the different subclasses 7856 * of ViewGroup that are responsible for arranging their children. 7857 * 7858 * This method may return null if this View is not attached to a parent 7859 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 7860 * was not invoked successfully. When a View is attached to a parent 7861 * ViewGroup, this method must not return null. 7862 * 7863 * @return The LayoutParams associated with this view, or null if no 7864 * parameters have been set yet 7865 */ 7866 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 7867 public ViewGroup.LayoutParams getLayoutParams() { 7868 return mLayoutParams; 7869 } 7870 7871 /** 7872 * Set the layout parameters associated with this view. These supply 7873 * parameters to the <i>parent</i> of this view specifying how it should be 7874 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 7875 * correspond to the different subclasses of ViewGroup that are responsible 7876 * for arranging their children. 7877 * 7878 * @param params The layout parameters for this view, cannot be null 7879 */ 7880 public void setLayoutParams(ViewGroup.LayoutParams params) { 7881 if (params == null) { 7882 throw new NullPointerException("Layout parameters cannot be null"); 7883 } 7884 mLayoutParams = params; 7885 requestLayout(); 7886 } 7887 7888 /** 7889 * Set the scrolled position of your view. This will cause a call to 7890 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7891 * invalidated. 7892 * @param x the x position to scroll to 7893 * @param y the y position to scroll to 7894 */ 7895 public void scrollTo(int x, int y) { 7896 if (mScrollX != x || mScrollY != y) { 7897 int oldX = mScrollX; 7898 int oldY = mScrollY; 7899 mScrollX = x; 7900 mScrollY = y; 7901 invalidateParentCaches(); 7902 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 7903 if (!awakenScrollBars()) { 7904 invalidate(true); 7905 } 7906 } 7907 } 7908 7909 /** 7910 * Move the scrolled position of your view. This will cause a call to 7911 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7912 * invalidated. 7913 * @param x the amount of pixels to scroll by horizontally 7914 * @param y the amount of pixels to scroll by vertically 7915 */ 7916 public void scrollBy(int x, int y) { 7917 scrollTo(mScrollX + x, mScrollY + y); 7918 } 7919 7920 /** 7921 * <p>Trigger the scrollbars to draw. When invoked this method starts an 7922 * animation to fade the scrollbars out after a default delay. If a subclass 7923 * provides animated scrolling, the start delay should equal the duration 7924 * of the scrolling animation.</p> 7925 * 7926 * <p>The animation starts only if at least one of the scrollbars is 7927 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 7928 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7929 * this method returns true, and false otherwise. If the animation is 7930 * started, this method calls {@link #invalidate()}; in that case the 7931 * caller should not call {@link #invalidate()}.</p> 7932 * 7933 * <p>This method should be invoked every time a subclass directly updates 7934 * the scroll parameters.</p> 7935 * 7936 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 7937 * and {@link #scrollTo(int, int)}.</p> 7938 * 7939 * @return true if the animation is played, false otherwise 7940 * 7941 * @see #awakenScrollBars(int) 7942 * @see #scrollBy(int, int) 7943 * @see #scrollTo(int, int) 7944 * @see #isHorizontalScrollBarEnabled() 7945 * @see #isVerticalScrollBarEnabled() 7946 * @see #setHorizontalScrollBarEnabled(boolean) 7947 * @see #setVerticalScrollBarEnabled(boolean) 7948 */ 7949 protected boolean awakenScrollBars() { 7950 return mScrollCache != null && 7951 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 7952 } 7953 7954 /** 7955 * Trigger the scrollbars to draw. 7956 * This method differs from awakenScrollBars() only in its default duration. 7957 * initialAwakenScrollBars() will show the scroll bars for longer than 7958 * usual to give the user more of a chance to notice them. 7959 * 7960 * @return true if the animation is played, false otherwise. 7961 */ 7962 private boolean initialAwakenScrollBars() { 7963 return mScrollCache != null && 7964 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 7965 } 7966 7967 /** 7968 * <p> 7969 * Trigger the scrollbars to draw. When invoked this method starts an 7970 * animation to fade the scrollbars out after a fixed delay. If a subclass 7971 * provides animated scrolling, the start delay should equal the duration of 7972 * the scrolling animation. 7973 * </p> 7974 * 7975 * <p> 7976 * The animation starts only if at least one of the scrollbars is enabled, 7977 * as specified by {@link #isHorizontalScrollBarEnabled()} and 7978 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7979 * this method returns true, and false otherwise. If the animation is 7980 * started, this method calls {@link #invalidate()}; in that case the caller 7981 * should not call {@link #invalidate()}. 7982 * </p> 7983 * 7984 * <p> 7985 * This method should be invoked everytime a subclass directly updates the 7986 * scroll parameters. 7987 * </p> 7988 * 7989 * @param startDelay the delay, in milliseconds, after which the animation 7990 * should start; when the delay is 0, the animation starts 7991 * immediately 7992 * @return true if the animation is played, false otherwise 7993 * 7994 * @see #scrollBy(int, int) 7995 * @see #scrollTo(int, int) 7996 * @see #isHorizontalScrollBarEnabled() 7997 * @see #isVerticalScrollBarEnabled() 7998 * @see #setHorizontalScrollBarEnabled(boolean) 7999 * @see #setVerticalScrollBarEnabled(boolean) 8000 */ 8001 protected boolean awakenScrollBars(int startDelay) { 8002 return awakenScrollBars(startDelay, true); 8003 } 8004 8005 /** 8006 * <p> 8007 * Trigger the scrollbars to draw. When invoked this method starts an 8008 * animation to fade the scrollbars out after a fixed delay. If a subclass 8009 * provides animated scrolling, the start delay should equal the duration of 8010 * the scrolling animation. 8011 * </p> 8012 * 8013 * <p> 8014 * The animation starts only if at least one of the scrollbars is enabled, 8015 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8016 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8017 * this method returns true, and false otherwise. If the animation is 8018 * started, this method calls {@link #invalidate()} if the invalidate parameter 8019 * is set to true; in that case the caller 8020 * should not call {@link #invalidate()}. 8021 * </p> 8022 * 8023 * <p> 8024 * This method should be invoked everytime a subclass directly updates the 8025 * scroll parameters. 8026 * </p> 8027 * 8028 * @param startDelay the delay, in milliseconds, after which the animation 8029 * should start; when the delay is 0, the animation starts 8030 * immediately 8031 * 8032 * @param invalidate Wheter this method should call invalidate 8033 * 8034 * @return true if the animation is played, false otherwise 8035 * 8036 * @see #scrollBy(int, int) 8037 * @see #scrollTo(int, int) 8038 * @see #isHorizontalScrollBarEnabled() 8039 * @see #isVerticalScrollBarEnabled() 8040 * @see #setHorizontalScrollBarEnabled(boolean) 8041 * @see #setVerticalScrollBarEnabled(boolean) 8042 */ 8043 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 8044 final ScrollabilityCache scrollCache = mScrollCache; 8045 8046 if (scrollCache == null || !scrollCache.fadeScrollBars) { 8047 return false; 8048 } 8049 8050 if (scrollCache.scrollBar == null) { 8051 scrollCache.scrollBar = new ScrollBarDrawable(); 8052 } 8053 8054 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 8055 8056 if (invalidate) { 8057 // Invalidate to show the scrollbars 8058 invalidate(true); 8059 } 8060 8061 if (scrollCache.state == ScrollabilityCache.OFF) { 8062 // FIXME: this is copied from WindowManagerService. 8063 // We should get this value from the system when it 8064 // is possible to do so. 8065 final int KEY_REPEAT_FIRST_DELAY = 750; 8066 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 8067 } 8068 8069 // Tell mScrollCache when we should start fading. This may 8070 // extend the fade start time if one was already scheduled 8071 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 8072 scrollCache.fadeStartTime = fadeStartTime; 8073 scrollCache.state = ScrollabilityCache.ON; 8074 8075 // Schedule our fader to run, unscheduling any old ones first 8076 if (mAttachInfo != null) { 8077 mAttachInfo.mHandler.removeCallbacks(scrollCache); 8078 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 8079 } 8080 8081 return true; 8082 } 8083 8084 return false; 8085 } 8086 8087 /** 8088 * Do not invalidate views which are not visible and which are not running an animation. They 8089 * will not get drawn and they should not set dirty flags as if they will be drawn 8090 */ 8091 private boolean skipInvalidate() { 8092 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 8093 (!(mParent instanceof ViewGroup) || 8094 !((ViewGroup) mParent).isViewTransitioning(this)); 8095 } 8096 /** 8097 * Mark the the area defined by dirty as needing to be drawn. If the view is 8098 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 8099 * in the future. This must be called from a UI thread. To call from a non-UI 8100 * thread, call {@link #postInvalidate()}. 8101 * 8102 * WARNING: This method is destructive to dirty. 8103 * @param dirty the rectangle representing the bounds of the dirty region 8104 */ 8105 public void invalidate(Rect dirty) { 8106 if (ViewDebug.TRACE_HIERARCHY) { 8107 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8108 } 8109 8110 if (skipInvalidate()) { 8111 return; 8112 } 8113 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8114 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8115 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8116 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8117 mPrivateFlags |= INVALIDATED; 8118 final ViewParent p = mParent; 8119 final AttachInfo ai = mAttachInfo; 8120 //noinspection PointlessBooleanExpression,ConstantConditions 8121 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8122 if (p != null && ai != null && ai.mHardwareAccelerated) { 8123 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8124 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8125 p.invalidateChild(this, null); 8126 return; 8127 } 8128 } 8129 if (p != null && ai != null) { 8130 final int scrollX = mScrollX; 8131 final int scrollY = mScrollY; 8132 final Rect r = ai.mTmpInvalRect; 8133 r.set(dirty.left - scrollX, dirty.top - scrollY, 8134 dirty.right - scrollX, dirty.bottom - scrollY); 8135 mParent.invalidateChild(this, r); 8136 } 8137 } 8138 } 8139 8140 /** 8141 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 8142 * The coordinates of the dirty rect are relative to the view. 8143 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 8144 * will be called at some point in the future. This must be called from 8145 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 8146 * @param l the left position of the dirty region 8147 * @param t the top position of the dirty region 8148 * @param r the right position of the dirty region 8149 * @param b the bottom position of the dirty region 8150 */ 8151 public void invalidate(int l, int t, int r, int b) { 8152 if (ViewDebug.TRACE_HIERARCHY) { 8153 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8154 } 8155 8156 if (skipInvalidate()) { 8157 return; 8158 } 8159 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8160 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8161 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8162 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8163 mPrivateFlags |= INVALIDATED; 8164 final ViewParent p = mParent; 8165 final AttachInfo ai = mAttachInfo; 8166 //noinspection PointlessBooleanExpression,ConstantConditions 8167 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8168 if (p != null && ai != null && ai.mHardwareAccelerated) { 8169 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8170 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8171 p.invalidateChild(this, null); 8172 return; 8173 } 8174 } 8175 if (p != null && ai != null && l < r && t < b) { 8176 final int scrollX = mScrollX; 8177 final int scrollY = mScrollY; 8178 final Rect tmpr = ai.mTmpInvalRect; 8179 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 8180 p.invalidateChild(this, tmpr); 8181 } 8182 } 8183 } 8184 8185 /** 8186 * Invalidate the whole view. If the view is visible, 8187 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 8188 * the future. This must be called from a UI thread. To call from a non-UI thread, 8189 * call {@link #postInvalidate()}. 8190 */ 8191 public void invalidate() { 8192 invalidate(true); 8193 } 8194 8195 /** 8196 * This is where the invalidate() work actually happens. A full invalidate() 8197 * causes the drawing cache to be invalidated, but this function can be called with 8198 * invalidateCache set to false to skip that invalidation step for cases that do not 8199 * need it (for example, a component that remains at the same dimensions with the same 8200 * content). 8201 * 8202 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 8203 * well. This is usually true for a full invalidate, but may be set to false if the 8204 * View's contents or dimensions have not changed. 8205 */ 8206 void invalidate(boolean invalidateCache) { 8207 if (ViewDebug.TRACE_HIERARCHY) { 8208 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8209 } 8210 8211 if (skipInvalidate()) { 8212 return; 8213 } 8214 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8215 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 8216 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 8217 mLastIsOpaque = isOpaque(); 8218 mPrivateFlags &= ~DRAWN; 8219 if (invalidateCache) { 8220 mPrivateFlags |= INVALIDATED; 8221 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8222 } 8223 final AttachInfo ai = mAttachInfo; 8224 final ViewParent p = mParent; 8225 //noinspection PointlessBooleanExpression,ConstantConditions 8226 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8227 if (p != null && ai != null && ai.mHardwareAccelerated) { 8228 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8229 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8230 p.invalidateChild(this, null); 8231 return; 8232 } 8233 } 8234 8235 if (p != null && ai != null) { 8236 final Rect r = ai.mTmpInvalRect; 8237 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8238 // Don't call invalidate -- we don't want to internally scroll 8239 // our own bounds 8240 p.invalidateChild(this, r); 8241 } 8242 } 8243 } 8244 8245 /** 8246 * @hide 8247 */ 8248 public void fastInvalidate() { 8249 if (skipInvalidate()) { 8250 return; 8251 } 8252 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8253 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8254 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8255 if (mParent instanceof View) { 8256 ((View) mParent).mPrivateFlags |= INVALIDATED; 8257 } 8258 mPrivateFlags &= ~DRAWN; 8259 mPrivateFlags |= INVALIDATED; 8260 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8261 if (mParent != null && mAttachInfo != null) { 8262 if (mAttachInfo.mHardwareAccelerated) { 8263 mParent.invalidateChild(this, null); 8264 } else { 8265 final Rect r = mAttachInfo.mTmpInvalRect; 8266 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8267 // Don't call invalidate -- we don't want to internally scroll 8268 // our own bounds 8269 mParent.invalidateChild(this, r); 8270 } 8271 } 8272 } 8273 } 8274 8275 /** 8276 * Used to indicate that the parent of this view should clear its caches. This functionality 8277 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8278 * which is necessary when various parent-managed properties of the view change, such as 8279 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 8280 * clears the parent caches and does not causes an invalidate event. 8281 * 8282 * @hide 8283 */ 8284 protected void invalidateParentCaches() { 8285 if (mParent instanceof View) { 8286 ((View) mParent).mPrivateFlags |= INVALIDATED; 8287 } 8288 } 8289 8290 /** 8291 * Used to indicate that the parent of this view should be invalidated. This functionality 8292 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8293 * which is necessary when various parent-managed properties of the view change, such as 8294 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 8295 * an invalidation event to the parent. 8296 * 8297 * @hide 8298 */ 8299 protected void invalidateParentIfNeeded() { 8300 if (isHardwareAccelerated() && mParent instanceof View) { 8301 ((View) mParent).invalidate(true); 8302 } 8303 } 8304 8305 /** 8306 * Indicates whether this View is opaque. An opaque View guarantees that it will 8307 * draw all the pixels overlapping its bounds using a fully opaque color. 8308 * 8309 * Subclasses of View should override this method whenever possible to indicate 8310 * whether an instance is opaque. Opaque Views are treated in a special way by 8311 * the View hierarchy, possibly allowing it to perform optimizations during 8312 * invalidate/draw passes. 8313 * 8314 * @return True if this View is guaranteed to be fully opaque, false otherwise. 8315 */ 8316 @ViewDebug.ExportedProperty(category = "drawing") 8317 public boolean isOpaque() { 8318 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 8319 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 8320 } 8321 8322 /** 8323 * @hide 8324 */ 8325 protected void computeOpaqueFlags() { 8326 // Opaque if: 8327 // - Has a background 8328 // - Background is opaque 8329 // - Doesn't have scrollbars or scrollbars are inside overlay 8330 8331 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 8332 mPrivateFlags |= OPAQUE_BACKGROUND; 8333 } else { 8334 mPrivateFlags &= ~OPAQUE_BACKGROUND; 8335 } 8336 8337 final int flags = mViewFlags; 8338 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 8339 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 8340 mPrivateFlags |= OPAQUE_SCROLLBARS; 8341 } else { 8342 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 8343 } 8344 } 8345 8346 /** 8347 * @hide 8348 */ 8349 protected boolean hasOpaqueScrollbars() { 8350 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 8351 } 8352 8353 /** 8354 * @return A handler associated with the thread running the View. This 8355 * handler can be used to pump events in the UI events queue. 8356 */ 8357 public Handler getHandler() { 8358 if (mAttachInfo != null) { 8359 return mAttachInfo.mHandler; 8360 } 8361 return null; 8362 } 8363 8364 /** 8365 * <p>Causes the Runnable to be added to the message queue. 8366 * The runnable will be run on the user interface thread.</p> 8367 * 8368 * <p>This method can be invoked from outside of the UI thread 8369 * only when this View is attached to a window.</p> 8370 * 8371 * @param action The Runnable that will be executed. 8372 * 8373 * @return Returns true if the Runnable was successfully placed in to the 8374 * message queue. Returns false on failure, usually because the 8375 * looper processing the message queue is exiting. 8376 */ 8377 public boolean post(Runnable action) { 8378 Handler handler; 8379 AttachInfo attachInfo = mAttachInfo; 8380 if (attachInfo != null) { 8381 handler = attachInfo.mHandler; 8382 } else { 8383 // Assume that post will succeed later 8384 ViewRootImpl.getRunQueue().post(action); 8385 return true; 8386 } 8387 8388 return handler.post(action); 8389 } 8390 8391 /** 8392 * <p>Causes the Runnable to be added to the message queue, to be run 8393 * after the specified amount of time elapses. 8394 * The runnable will be run on the user interface thread.</p> 8395 * 8396 * <p>This method can be invoked from outside of the UI thread 8397 * only when this View is attached to a window.</p> 8398 * 8399 * @param action The Runnable that will be executed. 8400 * @param delayMillis The delay (in milliseconds) until the Runnable 8401 * will be executed. 8402 * 8403 * @return true if the Runnable was successfully placed in to the 8404 * message queue. Returns false on failure, usually because the 8405 * looper processing the message queue is exiting. Note that a 8406 * result of true does not mean the Runnable will be processed -- 8407 * if the looper is quit before the delivery time of the message 8408 * occurs then the message will be dropped. 8409 */ 8410 public boolean postDelayed(Runnable action, long delayMillis) { 8411 Handler handler; 8412 AttachInfo attachInfo = mAttachInfo; 8413 if (attachInfo != null) { 8414 handler = attachInfo.mHandler; 8415 } else { 8416 // Assume that post will succeed later 8417 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8418 return true; 8419 } 8420 8421 return handler.postDelayed(action, delayMillis); 8422 } 8423 8424 /** 8425 * <p>Removes the specified Runnable from the message queue.</p> 8426 * 8427 * <p>This method can be invoked from outside of the UI thread 8428 * only when this View is attached to a window.</p> 8429 * 8430 * @param action The Runnable to remove from the message handling queue 8431 * 8432 * @return true if this view could ask the Handler to remove the Runnable, 8433 * false otherwise. When the returned value is true, the Runnable 8434 * may or may not have been actually removed from the message queue 8435 * (for instance, if the Runnable was not in the queue already.) 8436 */ 8437 public boolean removeCallbacks(Runnable action) { 8438 Handler handler; 8439 AttachInfo attachInfo = mAttachInfo; 8440 if (attachInfo != null) { 8441 handler = attachInfo.mHandler; 8442 } else { 8443 // Assume that post will succeed later 8444 ViewRootImpl.getRunQueue().removeCallbacks(action); 8445 return true; 8446 } 8447 8448 handler.removeCallbacks(action); 8449 return true; 8450 } 8451 8452 /** 8453 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 8454 * Use this to invalidate the View from a non-UI thread.</p> 8455 * 8456 * <p>This method can be invoked from outside of the UI thread 8457 * only when this View is attached to a window.</p> 8458 * 8459 * @see #invalidate() 8460 */ 8461 public void postInvalidate() { 8462 postInvalidateDelayed(0); 8463 } 8464 8465 /** 8466 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8467 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 8468 * 8469 * <p>This method can be invoked from outside of the UI thread 8470 * only when this View is attached to a window.</p> 8471 * 8472 * @param left The left coordinate of the rectangle to invalidate. 8473 * @param top The top coordinate of the rectangle to invalidate. 8474 * @param right The right coordinate of the rectangle to invalidate. 8475 * @param bottom The bottom coordinate of the rectangle to invalidate. 8476 * 8477 * @see #invalidate(int, int, int, int) 8478 * @see #invalidate(Rect) 8479 */ 8480 public void postInvalidate(int left, int top, int right, int bottom) { 8481 postInvalidateDelayed(0, left, top, right, bottom); 8482 } 8483 8484 /** 8485 * <p>Cause an invalidate to happen on a subsequent cycle through the event 8486 * loop. Waits for the specified amount of time.</p> 8487 * 8488 * <p>This method can be invoked from outside of the UI thread 8489 * only when this View is attached to a window.</p> 8490 * 8491 * @param delayMilliseconds the duration in milliseconds to delay the 8492 * invalidation by 8493 */ 8494 public void postInvalidateDelayed(long delayMilliseconds) { 8495 // We try only with the AttachInfo because there's no point in invalidating 8496 // if we are not attached to our window 8497 AttachInfo attachInfo = mAttachInfo; 8498 if (attachInfo != null) { 8499 Message msg = Message.obtain(); 8500 msg.what = AttachInfo.INVALIDATE_MSG; 8501 msg.obj = this; 8502 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8503 } 8504 } 8505 8506 /** 8507 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8508 * through the event loop. Waits for the specified amount of time.</p> 8509 * 8510 * <p>This method can be invoked from outside of the UI thread 8511 * only when this View is attached to a window.</p> 8512 * 8513 * @param delayMilliseconds the duration in milliseconds to delay the 8514 * invalidation by 8515 * @param left The left coordinate of the rectangle to invalidate. 8516 * @param top The top coordinate of the rectangle to invalidate. 8517 * @param right The right coordinate of the rectangle to invalidate. 8518 * @param bottom The bottom coordinate of the rectangle to invalidate. 8519 */ 8520 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8521 int right, int bottom) { 8522 8523 // We try only with the AttachInfo because there's no point in invalidating 8524 // if we are not attached to our window 8525 AttachInfo attachInfo = mAttachInfo; 8526 if (attachInfo != null) { 8527 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8528 info.target = this; 8529 info.left = left; 8530 info.top = top; 8531 info.right = right; 8532 info.bottom = bottom; 8533 8534 final Message msg = Message.obtain(); 8535 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 8536 msg.obj = info; 8537 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8538 } 8539 } 8540 8541 /** 8542 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 8543 * This event is sent at most once every 8544 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 8545 */ 8546 private void postSendViewScrolledAccessibilityEventCallback() { 8547 if (mSendViewScrolledAccessibilityEvent == null) { 8548 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 8549 } 8550 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 8551 mSendViewScrolledAccessibilityEvent.mIsPending = true; 8552 postDelayed(mSendViewScrolledAccessibilityEvent, 8553 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 8554 } 8555 } 8556 8557 /** 8558 * Called by a parent to request that a child update its values for mScrollX 8559 * and mScrollY if necessary. This will typically be done if the child is 8560 * animating a scroll using a {@link android.widget.Scroller Scroller} 8561 * object. 8562 */ 8563 public void computeScroll() { 8564 } 8565 8566 /** 8567 * <p>Indicate whether the horizontal edges are faded when the view is 8568 * scrolled horizontally.</p> 8569 * 8570 * @return true if the horizontal edges should are faded on scroll, false 8571 * otherwise 8572 * 8573 * @see #setHorizontalFadingEdgeEnabled(boolean) 8574 * @attr ref android.R.styleable#View_fadingEdge 8575 */ 8576 public boolean isHorizontalFadingEdgeEnabled() { 8577 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 8578 } 8579 8580 /** 8581 * <p>Define whether the horizontal edges should be faded when this view 8582 * is scrolled horizontally.</p> 8583 * 8584 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 8585 * be faded when the view is scrolled 8586 * horizontally 8587 * 8588 * @see #isHorizontalFadingEdgeEnabled() 8589 * @attr ref android.R.styleable#View_fadingEdge 8590 */ 8591 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 8592 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 8593 if (horizontalFadingEdgeEnabled) { 8594 initScrollCache(); 8595 } 8596 8597 mViewFlags ^= FADING_EDGE_HORIZONTAL; 8598 } 8599 } 8600 8601 /** 8602 * <p>Indicate whether the vertical edges are faded when the view is 8603 * scrolled horizontally.</p> 8604 * 8605 * @return true if the vertical edges should are faded on scroll, false 8606 * otherwise 8607 * 8608 * @see #setVerticalFadingEdgeEnabled(boolean) 8609 * @attr ref android.R.styleable#View_fadingEdge 8610 */ 8611 public boolean isVerticalFadingEdgeEnabled() { 8612 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 8613 } 8614 8615 /** 8616 * <p>Define whether the vertical edges should be faded when this view 8617 * is scrolled vertically.</p> 8618 * 8619 * @param verticalFadingEdgeEnabled true if the vertical edges should 8620 * be faded when the view is scrolled 8621 * vertically 8622 * 8623 * @see #isVerticalFadingEdgeEnabled() 8624 * @attr ref android.R.styleable#View_fadingEdge 8625 */ 8626 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 8627 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 8628 if (verticalFadingEdgeEnabled) { 8629 initScrollCache(); 8630 } 8631 8632 mViewFlags ^= FADING_EDGE_VERTICAL; 8633 } 8634 } 8635 8636 /** 8637 * Returns the strength, or intensity, of the top faded edge. The strength is 8638 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8639 * returns 0.0 or 1.0 but no value in between. 8640 * 8641 * Subclasses should override this method to provide a smoother fade transition 8642 * when scrolling occurs. 8643 * 8644 * @return the intensity of the top fade as a float between 0.0f and 1.0f 8645 */ 8646 protected float getTopFadingEdgeStrength() { 8647 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 8648 } 8649 8650 /** 8651 * Returns the strength, or intensity, of the bottom faded edge. The strength is 8652 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8653 * returns 0.0 or 1.0 but no value in between. 8654 * 8655 * Subclasses should override this method to provide a smoother fade transition 8656 * when scrolling occurs. 8657 * 8658 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 8659 */ 8660 protected float getBottomFadingEdgeStrength() { 8661 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 8662 computeVerticalScrollRange() ? 1.0f : 0.0f; 8663 } 8664 8665 /** 8666 * Returns the strength, or intensity, of the left faded edge. The strength is 8667 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8668 * returns 0.0 or 1.0 but no value in between. 8669 * 8670 * Subclasses should override this method to provide a smoother fade transition 8671 * when scrolling occurs. 8672 * 8673 * @return the intensity of the left fade as a float between 0.0f and 1.0f 8674 */ 8675 protected float getLeftFadingEdgeStrength() { 8676 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 8677 } 8678 8679 /** 8680 * Returns the strength, or intensity, of the right faded edge. The strength is 8681 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8682 * returns 0.0 or 1.0 but no value in between. 8683 * 8684 * Subclasses should override this method to provide a smoother fade transition 8685 * when scrolling occurs. 8686 * 8687 * @return the intensity of the right fade as a float between 0.0f and 1.0f 8688 */ 8689 protected float getRightFadingEdgeStrength() { 8690 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 8691 computeHorizontalScrollRange() ? 1.0f : 0.0f; 8692 } 8693 8694 /** 8695 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 8696 * scrollbar is not drawn by default.</p> 8697 * 8698 * @return true if the horizontal scrollbar should be painted, false 8699 * otherwise 8700 * 8701 * @see #setHorizontalScrollBarEnabled(boolean) 8702 */ 8703 public boolean isHorizontalScrollBarEnabled() { 8704 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 8705 } 8706 8707 /** 8708 * <p>Define whether the horizontal scrollbar should be drawn or not. The 8709 * scrollbar is not drawn by default.</p> 8710 * 8711 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 8712 * be painted 8713 * 8714 * @see #isHorizontalScrollBarEnabled() 8715 */ 8716 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 8717 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 8718 mViewFlags ^= SCROLLBARS_HORIZONTAL; 8719 computeOpaqueFlags(); 8720 resolvePadding(); 8721 } 8722 } 8723 8724 /** 8725 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 8726 * scrollbar is not drawn by default.</p> 8727 * 8728 * @return true if the vertical scrollbar should be painted, false 8729 * otherwise 8730 * 8731 * @see #setVerticalScrollBarEnabled(boolean) 8732 */ 8733 public boolean isVerticalScrollBarEnabled() { 8734 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 8735 } 8736 8737 /** 8738 * <p>Define whether the vertical scrollbar should be drawn or not. The 8739 * scrollbar is not drawn by default.</p> 8740 * 8741 * @param verticalScrollBarEnabled true if the vertical scrollbar should 8742 * be painted 8743 * 8744 * @see #isVerticalScrollBarEnabled() 8745 */ 8746 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 8747 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 8748 mViewFlags ^= SCROLLBARS_VERTICAL; 8749 computeOpaqueFlags(); 8750 resolvePadding(); 8751 } 8752 } 8753 8754 /** 8755 * @hide 8756 */ 8757 protected void recomputePadding() { 8758 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 8759 } 8760 8761 /** 8762 * Define whether scrollbars will fade when the view is not scrolling. 8763 * 8764 * @param fadeScrollbars wheter to enable fading 8765 * 8766 */ 8767 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 8768 initScrollCache(); 8769 final ScrollabilityCache scrollabilityCache = mScrollCache; 8770 scrollabilityCache.fadeScrollBars = fadeScrollbars; 8771 if (fadeScrollbars) { 8772 scrollabilityCache.state = ScrollabilityCache.OFF; 8773 } else { 8774 scrollabilityCache.state = ScrollabilityCache.ON; 8775 } 8776 } 8777 8778 /** 8779 * 8780 * Returns true if scrollbars will fade when this view is not scrolling 8781 * 8782 * @return true if scrollbar fading is enabled 8783 */ 8784 public boolean isScrollbarFadingEnabled() { 8785 return mScrollCache != null && mScrollCache.fadeScrollBars; 8786 } 8787 8788 /** 8789 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 8790 * inset. When inset, they add to the padding of the view. And the scrollbars 8791 * can be drawn inside the padding area or on the edge of the view. For example, 8792 * if a view has a background drawable and you want to draw the scrollbars 8793 * inside the padding specified by the drawable, you can use 8794 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 8795 * appear at the edge of the view, ignoring the padding, then you can use 8796 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 8797 * @param style the style of the scrollbars. Should be one of 8798 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 8799 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 8800 * @see #SCROLLBARS_INSIDE_OVERLAY 8801 * @see #SCROLLBARS_INSIDE_INSET 8802 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8803 * @see #SCROLLBARS_OUTSIDE_INSET 8804 */ 8805 public void setScrollBarStyle(int style) { 8806 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 8807 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 8808 computeOpaqueFlags(); 8809 resolvePadding(); 8810 } 8811 } 8812 8813 /** 8814 * <p>Returns the current scrollbar style.</p> 8815 * @return the current scrollbar style 8816 * @see #SCROLLBARS_INSIDE_OVERLAY 8817 * @see #SCROLLBARS_INSIDE_INSET 8818 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8819 * @see #SCROLLBARS_OUTSIDE_INSET 8820 */ 8821 @ViewDebug.ExportedProperty(mapping = { 8822 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 8823 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 8824 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 8825 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 8826 }) 8827 public int getScrollBarStyle() { 8828 return mViewFlags & SCROLLBARS_STYLE_MASK; 8829 } 8830 8831 /** 8832 * <p>Compute the horizontal range that the horizontal scrollbar 8833 * represents.</p> 8834 * 8835 * <p>The range is expressed in arbitrary units that must be the same as the 8836 * units used by {@link #computeHorizontalScrollExtent()} and 8837 * {@link #computeHorizontalScrollOffset()}.</p> 8838 * 8839 * <p>The default range is the drawing width of this view.</p> 8840 * 8841 * @return the total horizontal range represented by the horizontal 8842 * scrollbar 8843 * 8844 * @see #computeHorizontalScrollExtent() 8845 * @see #computeHorizontalScrollOffset() 8846 * @see android.widget.ScrollBarDrawable 8847 */ 8848 protected int computeHorizontalScrollRange() { 8849 return getWidth(); 8850 } 8851 8852 /** 8853 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 8854 * within the horizontal range. This value is used to compute the position 8855 * of the thumb within the scrollbar's track.</p> 8856 * 8857 * <p>The range is expressed in arbitrary units that must be the same as the 8858 * units used by {@link #computeHorizontalScrollRange()} and 8859 * {@link #computeHorizontalScrollExtent()}.</p> 8860 * 8861 * <p>The default offset is the scroll offset of this view.</p> 8862 * 8863 * @return the horizontal offset of the scrollbar's thumb 8864 * 8865 * @see #computeHorizontalScrollRange() 8866 * @see #computeHorizontalScrollExtent() 8867 * @see android.widget.ScrollBarDrawable 8868 */ 8869 protected int computeHorizontalScrollOffset() { 8870 return mScrollX; 8871 } 8872 8873 /** 8874 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 8875 * within the horizontal range. This value is used to compute the length 8876 * of the thumb within the scrollbar's track.</p> 8877 * 8878 * <p>The range is expressed in arbitrary units that must be the same as the 8879 * units used by {@link #computeHorizontalScrollRange()} and 8880 * {@link #computeHorizontalScrollOffset()}.</p> 8881 * 8882 * <p>The default extent is the drawing width of this view.</p> 8883 * 8884 * @return the horizontal extent of the scrollbar's thumb 8885 * 8886 * @see #computeHorizontalScrollRange() 8887 * @see #computeHorizontalScrollOffset() 8888 * @see android.widget.ScrollBarDrawable 8889 */ 8890 protected int computeHorizontalScrollExtent() { 8891 return getWidth(); 8892 } 8893 8894 /** 8895 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 8896 * 8897 * <p>The range is expressed in arbitrary units that must be the same as the 8898 * units used by {@link #computeVerticalScrollExtent()} and 8899 * {@link #computeVerticalScrollOffset()}.</p> 8900 * 8901 * @return the total vertical range represented by the vertical scrollbar 8902 * 8903 * <p>The default range is the drawing height of this view.</p> 8904 * 8905 * @see #computeVerticalScrollExtent() 8906 * @see #computeVerticalScrollOffset() 8907 * @see android.widget.ScrollBarDrawable 8908 */ 8909 protected int computeVerticalScrollRange() { 8910 return getHeight(); 8911 } 8912 8913 /** 8914 * <p>Compute the vertical offset of the vertical scrollbar's thumb 8915 * within the horizontal range. This value is used to compute the position 8916 * of the thumb within the scrollbar's track.</p> 8917 * 8918 * <p>The range is expressed in arbitrary units that must be the same as the 8919 * units used by {@link #computeVerticalScrollRange()} and 8920 * {@link #computeVerticalScrollExtent()}.</p> 8921 * 8922 * <p>The default offset is the scroll offset of this view.</p> 8923 * 8924 * @return the vertical offset of the scrollbar's thumb 8925 * 8926 * @see #computeVerticalScrollRange() 8927 * @see #computeVerticalScrollExtent() 8928 * @see android.widget.ScrollBarDrawable 8929 */ 8930 protected int computeVerticalScrollOffset() { 8931 return mScrollY; 8932 } 8933 8934 /** 8935 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 8936 * within the vertical range. This value is used to compute the length 8937 * of the thumb within the scrollbar's track.</p> 8938 * 8939 * <p>The range is expressed in arbitrary units that must be the same as the 8940 * units used by {@link #computeVerticalScrollRange()} and 8941 * {@link #computeVerticalScrollOffset()}.</p> 8942 * 8943 * <p>The default extent is the drawing height of this view.</p> 8944 * 8945 * @return the vertical extent of the scrollbar's thumb 8946 * 8947 * @see #computeVerticalScrollRange() 8948 * @see #computeVerticalScrollOffset() 8949 * @see android.widget.ScrollBarDrawable 8950 */ 8951 protected int computeVerticalScrollExtent() { 8952 return getHeight(); 8953 } 8954 8955 /** 8956 * Check if this view can be scrolled horizontally in a certain direction. 8957 * 8958 * @param direction Negative to check scrolling left, positive to check scrolling right. 8959 * @return true if this view can be scrolled in the specified direction, false otherwise. 8960 */ 8961 public boolean canScrollHorizontally(int direction) { 8962 final int offset = computeHorizontalScrollOffset(); 8963 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 8964 if (range == 0) return false; 8965 if (direction < 0) { 8966 return offset > 0; 8967 } else { 8968 return offset < range - 1; 8969 } 8970 } 8971 8972 /** 8973 * Check if this view can be scrolled vertically in a certain direction. 8974 * 8975 * @param direction Negative to check scrolling up, positive to check scrolling down. 8976 * @return true if this view can be scrolled in the specified direction, false otherwise. 8977 */ 8978 public boolean canScrollVertically(int direction) { 8979 final int offset = computeVerticalScrollOffset(); 8980 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 8981 if (range == 0) return false; 8982 if (direction < 0) { 8983 return offset > 0; 8984 } else { 8985 return offset < range - 1; 8986 } 8987 } 8988 8989 /** 8990 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 8991 * scrollbars are painted only if they have been awakened first.</p> 8992 * 8993 * @param canvas the canvas on which to draw the scrollbars 8994 * 8995 * @see #awakenScrollBars(int) 8996 */ 8997 protected final void onDrawScrollBars(Canvas canvas) { 8998 // scrollbars are drawn only when the animation is running 8999 final ScrollabilityCache cache = mScrollCache; 9000 if (cache != null) { 9001 9002 int state = cache.state; 9003 9004 if (state == ScrollabilityCache.OFF) { 9005 return; 9006 } 9007 9008 boolean invalidate = false; 9009 9010 if (state == ScrollabilityCache.FADING) { 9011 // We're fading -- get our fade interpolation 9012 if (cache.interpolatorValues == null) { 9013 cache.interpolatorValues = new float[1]; 9014 } 9015 9016 float[] values = cache.interpolatorValues; 9017 9018 // Stops the animation if we're done 9019 if (cache.scrollBarInterpolator.timeToValues(values) == 9020 Interpolator.Result.FREEZE_END) { 9021 cache.state = ScrollabilityCache.OFF; 9022 } else { 9023 cache.scrollBar.setAlpha(Math.round(values[0])); 9024 } 9025 9026 // This will make the scroll bars inval themselves after 9027 // drawing. We only want this when we're fading so that 9028 // we prevent excessive redraws 9029 invalidate = true; 9030 } else { 9031 // We're just on -- but we may have been fading before so 9032 // reset alpha 9033 cache.scrollBar.setAlpha(255); 9034 } 9035 9036 9037 final int viewFlags = mViewFlags; 9038 9039 final boolean drawHorizontalScrollBar = 9040 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9041 final boolean drawVerticalScrollBar = 9042 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 9043 && !isVerticalScrollBarHidden(); 9044 9045 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 9046 final int width = mRight - mLeft; 9047 final int height = mBottom - mTop; 9048 9049 final ScrollBarDrawable scrollBar = cache.scrollBar; 9050 9051 final int scrollX = mScrollX; 9052 final int scrollY = mScrollY; 9053 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 9054 9055 int left, top, right, bottom; 9056 9057 if (drawHorizontalScrollBar) { 9058 int size = scrollBar.getSize(false); 9059 if (size <= 0) { 9060 size = cache.scrollBarSize; 9061 } 9062 9063 scrollBar.setParameters(computeHorizontalScrollRange(), 9064 computeHorizontalScrollOffset(), 9065 computeHorizontalScrollExtent(), false); 9066 final int verticalScrollBarGap = drawVerticalScrollBar ? 9067 getVerticalScrollbarWidth() : 0; 9068 top = scrollY + height - size - (mUserPaddingBottom & inside); 9069 left = scrollX + (mPaddingLeft & inside); 9070 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 9071 bottom = top + size; 9072 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 9073 if (invalidate) { 9074 invalidate(left, top, right, bottom); 9075 } 9076 } 9077 9078 if (drawVerticalScrollBar) { 9079 int size = scrollBar.getSize(true); 9080 if (size <= 0) { 9081 size = cache.scrollBarSize; 9082 } 9083 9084 scrollBar.setParameters(computeVerticalScrollRange(), 9085 computeVerticalScrollOffset(), 9086 computeVerticalScrollExtent(), true); 9087 switch (mVerticalScrollbarPosition) { 9088 default: 9089 case SCROLLBAR_POSITION_DEFAULT: 9090 case SCROLLBAR_POSITION_RIGHT: 9091 left = scrollX + width - size - (mUserPaddingRight & inside); 9092 break; 9093 case SCROLLBAR_POSITION_LEFT: 9094 left = scrollX + (mUserPaddingLeft & inside); 9095 break; 9096 } 9097 top = scrollY + (mPaddingTop & inside); 9098 right = left + size; 9099 bottom = scrollY + height - (mUserPaddingBottom & inside); 9100 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 9101 if (invalidate) { 9102 invalidate(left, top, right, bottom); 9103 } 9104 } 9105 } 9106 } 9107 } 9108 9109 /** 9110 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 9111 * FastScroller is visible. 9112 * @return whether to temporarily hide the vertical scrollbar 9113 * @hide 9114 */ 9115 protected boolean isVerticalScrollBarHidden() { 9116 return false; 9117 } 9118 9119 /** 9120 * <p>Draw the horizontal scrollbar if 9121 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 9122 * 9123 * @param canvas the canvas on which to draw the scrollbar 9124 * @param scrollBar the scrollbar's drawable 9125 * 9126 * @see #isHorizontalScrollBarEnabled() 9127 * @see #computeHorizontalScrollRange() 9128 * @see #computeHorizontalScrollExtent() 9129 * @see #computeHorizontalScrollOffset() 9130 * @see android.widget.ScrollBarDrawable 9131 * @hide 9132 */ 9133 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 9134 int l, int t, int r, int b) { 9135 scrollBar.setBounds(l, t, r, b); 9136 scrollBar.draw(canvas); 9137 } 9138 9139 /** 9140 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 9141 * returns true.</p> 9142 * 9143 * @param canvas the canvas on which to draw the scrollbar 9144 * @param scrollBar the scrollbar's drawable 9145 * 9146 * @see #isVerticalScrollBarEnabled() 9147 * @see #computeVerticalScrollRange() 9148 * @see #computeVerticalScrollExtent() 9149 * @see #computeVerticalScrollOffset() 9150 * @see android.widget.ScrollBarDrawable 9151 * @hide 9152 */ 9153 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 9154 int l, int t, int r, int b) { 9155 scrollBar.setBounds(l, t, r, b); 9156 scrollBar.draw(canvas); 9157 } 9158 9159 /** 9160 * Implement this to do your drawing. 9161 * 9162 * @param canvas the canvas on which the background will be drawn 9163 */ 9164 protected void onDraw(Canvas canvas) { 9165 } 9166 9167 /* 9168 * Caller is responsible for calling requestLayout if necessary. 9169 * (This allows addViewInLayout to not request a new layout.) 9170 */ 9171 void assignParent(ViewParent parent) { 9172 if (mParent == null) { 9173 mParent = parent; 9174 } else if (parent == null) { 9175 mParent = null; 9176 } else { 9177 throw new RuntimeException("view " + this + " being added, but" 9178 + " it already has a parent"); 9179 } 9180 } 9181 9182 /** 9183 * This is called when the view is attached to a window. At this point it 9184 * has a Surface and will start drawing. Note that this function is 9185 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 9186 * however it may be called any time before the first onDraw -- including 9187 * before or after {@link #onMeasure(int, int)}. 9188 * 9189 * @see #onDetachedFromWindow() 9190 */ 9191 protected void onAttachedToWindow() { 9192 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 9193 mParent.requestTransparentRegion(this); 9194 } 9195 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 9196 initialAwakenScrollBars(); 9197 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 9198 } 9199 jumpDrawablesToCurrentState(); 9200 // Order is important here: LayoutDirection MUST be resolved before Padding 9201 // and TextDirection 9202 resolveLayoutDirectionIfNeeded(); 9203 resolvePadding(); 9204 resolveTextDirection(); 9205 if (isFocused()) { 9206 InputMethodManager imm = InputMethodManager.peekInstance(); 9207 imm.focusIn(this); 9208 } 9209 } 9210 9211 /** 9212 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 9213 * that the parent directionality can and will be resolved before its children. 9214 */ 9215 private void resolveLayoutDirectionIfNeeded() { 9216 // Do not resolve if it is not needed 9217 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return; 9218 9219 // Clear any previous layout direction resolution 9220 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_RTL; 9221 9222 // Reset also TextDirection as a change into LayoutDirection may impact the selected 9223 // TextDirectionHeuristic 9224 resetResolvedTextDirection(); 9225 9226 // Set resolved depending on layout direction 9227 switch (getLayoutDirection()) { 9228 case LAYOUT_DIRECTION_INHERIT: 9229 // We cannot do the resolution if there is no parent 9230 if (mParent == null) return; 9231 9232 // If this is root view, no need to look at parent's layout dir. 9233 if (mParent instanceof ViewGroup) { 9234 ViewGroup viewGroup = ((ViewGroup) mParent); 9235 9236 // Check if the parent view group can resolve 9237 if (! viewGroup.canResolveLayoutDirection()) { 9238 return; 9239 } 9240 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 9241 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9242 } 9243 } 9244 break; 9245 case LAYOUT_DIRECTION_RTL: 9246 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9247 break; 9248 case LAYOUT_DIRECTION_LOCALE: 9249 if(isLayoutDirectionRtl(Locale.getDefault())) { 9250 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9251 } 9252 break; 9253 default: 9254 // Nothing to do, LTR by default 9255 } 9256 9257 // Set to resolved 9258 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 9259 } 9260 9261 /** 9262 * @hide 9263 */ 9264 protected void resolvePadding() { 9265 // If the user specified the absolute padding (either with android:padding or 9266 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 9267 // use the default padding or the padding from the background drawable 9268 // (stored at this point in mPadding*) 9269 switch (getResolvedLayoutDirection()) { 9270 case LAYOUT_DIRECTION_RTL: 9271 // Start user padding override Right user padding. Otherwise, if Right user 9272 // padding is not defined, use the default Right padding. If Right user padding 9273 // is defined, just use it. 9274 if (mUserPaddingStart >= 0) { 9275 mUserPaddingRight = mUserPaddingStart; 9276 } else if (mUserPaddingRight < 0) { 9277 mUserPaddingRight = mPaddingRight; 9278 } 9279 if (mUserPaddingEnd >= 0) { 9280 mUserPaddingLeft = mUserPaddingEnd; 9281 } else if (mUserPaddingLeft < 0) { 9282 mUserPaddingLeft = mPaddingLeft; 9283 } 9284 break; 9285 case LAYOUT_DIRECTION_LTR: 9286 default: 9287 // Start user padding override Left user padding. Otherwise, if Left user 9288 // padding is not defined, use the default left padding. If Left user padding 9289 // is defined, just use it. 9290 if (mUserPaddingStart >= 0) { 9291 mUserPaddingLeft = mUserPaddingStart; 9292 } else if (mUserPaddingLeft < 0) { 9293 mUserPaddingLeft = mPaddingLeft; 9294 } 9295 if (mUserPaddingEnd >= 0) { 9296 mUserPaddingRight = mUserPaddingEnd; 9297 } else if (mUserPaddingRight < 0) { 9298 mUserPaddingRight = mPaddingRight; 9299 } 9300 } 9301 9302 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 9303 9304 recomputePadding(); 9305 } 9306 9307 protected boolean canResolveLayoutDirection() { 9308 switch (getLayoutDirection()) { 9309 case LAYOUT_DIRECTION_INHERIT: 9310 return (mParent != null); 9311 default: 9312 return true; 9313 } 9314 } 9315 9316 /** 9317 * Reset the resolved layout direction. 9318 * 9319 * Subclasses need to override this method to clear cached information that depends on the 9320 * resolved layout direction, or to inform child views that inherit their layout direction. 9321 * Overrides must also call the superclass implementation at the start of their implementation. 9322 * 9323 * @hide 9324 */ 9325 protected void resetResolvedLayoutDirection() { 9326 // Reset the current View resolution 9327 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED; 9328 } 9329 9330 /** 9331 * Check if a Locale is corresponding to a RTL script. 9332 * 9333 * @param locale Locale to check 9334 * @return true if a Locale is corresponding to a RTL script. 9335 */ 9336 protected static boolean isLayoutDirectionRtl(Locale locale) { 9337 return (LocaleUtil.TEXT_LAYOUT_DIRECTION_RTL_DO_NOT_USE == 9338 LocaleUtil.getLayoutDirectionFromLocale(locale)); 9339 } 9340 9341 /** 9342 * This is called when the view is detached from a window. At this point it 9343 * no longer has a surface for drawing. 9344 * 9345 * @see #onAttachedToWindow() 9346 */ 9347 protected void onDetachedFromWindow() { 9348 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 9349 9350 removeUnsetPressCallback(); 9351 removeLongPressCallback(); 9352 removePerformClickCallback(); 9353 removeSendViewScrolledAccessibilityEventCallback(); 9354 9355 destroyDrawingCache(); 9356 9357 destroyLayer(); 9358 9359 if (mDisplayList != null) { 9360 mDisplayList.invalidate(); 9361 } 9362 9363 if (mAttachInfo != null) { 9364 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 9365 } 9366 9367 mCurrentAnimation = null; 9368 9369 resetResolvedLayoutDirection(); 9370 resetResolvedTextDirection(); 9371 } 9372 9373 /** 9374 * @return The number of times this view has been attached to a window 9375 */ 9376 protected int getWindowAttachCount() { 9377 return mWindowAttachCount; 9378 } 9379 9380 /** 9381 * Retrieve a unique token identifying the window this view is attached to. 9382 * @return Return the window's token for use in 9383 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 9384 */ 9385 public IBinder getWindowToken() { 9386 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 9387 } 9388 9389 /** 9390 * Retrieve a unique token identifying the top-level "real" window of 9391 * the window that this view is attached to. That is, this is like 9392 * {@link #getWindowToken}, except if the window this view in is a panel 9393 * window (attached to another containing window), then the token of 9394 * the containing window is returned instead. 9395 * 9396 * @return Returns the associated window token, either 9397 * {@link #getWindowToken()} or the containing window's token. 9398 */ 9399 public IBinder getApplicationWindowToken() { 9400 AttachInfo ai = mAttachInfo; 9401 if (ai != null) { 9402 IBinder appWindowToken = ai.mPanelParentWindowToken; 9403 if (appWindowToken == null) { 9404 appWindowToken = ai.mWindowToken; 9405 } 9406 return appWindowToken; 9407 } 9408 return null; 9409 } 9410 9411 /** 9412 * Retrieve private session object this view hierarchy is using to 9413 * communicate with the window manager. 9414 * @return the session object to communicate with the window manager 9415 */ 9416 /*package*/ IWindowSession getWindowSession() { 9417 return mAttachInfo != null ? mAttachInfo.mSession : null; 9418 } 9419 9420 /** 9421 * @param info the {@link android.view.View.AttachInfo} to associated with 9422 * this view 9423 */ 9424 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 9425 //System.out.println("Attached! " + this); 9426 mAttachInfo = info; 9427 mWindowAttachCount++; 9428 // We will need to evaluate the drawable state at least once. 9429 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9430 if (mFloatingTreeObserver != null) { 9431 info.mTreeObserver.merge(mFloatingTreeObserver); 9432 mFloatingTreeObserver = null; 9433 } 9434 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 9435 mAttachInfo.mScrollContainers.add(this); 9436 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 9437 } 9438 performCollectViewAttributes(visibility); 9439 onAttachedToWindow(); 9440 9441 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9442 mOnAttachStateChangeListeners; 9443 if (listeners != null && listeners.size() > 0) { 9444 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9445 // perform the dispatching. The iterator is a safe guard against listeners that 9446 // could mutate the list by calling the various add/remove methods. This prevents 9447 // the array from being modified while we iterate it. 9448 for (OnAttachStateChangeListener listener : listeners) { 9449 listener.onViewAttachedToWindow(this); 9450 } 9451 } 9452 9453 int vis = info.mWindowVisibility; 9454 if (vis != GONE) { 9455 onWindowVisibilityChanged(vis); 9456 } 9457 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 9458 // If nobody has evaluated the drawable state yet, then do it now. 9459 refreshDrawableState(); 9460 } 9461 } 9462 9463 void dispatchDetachedFromWindow() { 9464 AttachInfo info = mAttachInfo; 9465 if (info != null) { 9466 int vis = info.mWindowVisibility; 9467 if (vis != GONE) { 9468 onWindowVisibilityChanged(GONE); 9469 } 9470 } 9471 9472 onDetachedFromWindow(); 9473 9474 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9475 mOnAttachStateChangeListeners; 9476 if (listeners != null && listeners.size() > 0) { 9477 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9478 // perform the dispatching. The iterator is a safe guard against listeners that 9479 // could mutate the list by calling the various add/remove methods. This prevents 9480 // the array from being modified while we iterate it. 9481 for (OnAttachStateChangeListener listener : listeners) { 9482 listener.onViewDetachedFromWindow(this); 9483 } 9484 } 9485 9486 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 9487 mAttachInfo.mScrollContainers.remove(this); 9488 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 9489 } 9490 9491 mAttachInfo = null; 9492 } 9493 9494 /** 9495 * Store this view hierarchy's frozen state into the given container. 9496 * 9497 * @param container The SparseArray in which to save the view's state. 9498 * 9499 * @see #restoreHierarchyState(android.util.SparseArray) 9500 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9501 * @see #onSaveInstanceState() 9502 */ 9503 public void saveHierarchyState(SparseArray<Parcelable> container) { 9504 dispatchSaveInstanceState(container); 9505 } 9506 9507 /** 9508 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 9509 * this view and its children. May be overridden to modify how freezing happens to a 9510 * view's children; for example, some views may want to not store state for their children. 9511 * 9512 * @param container The SparseArray in which to save the view's state. 9513 * 9514 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9515 * @see #saveHierarchyState(android.util.SparseArray) 9516 * @see #onSaveInstanceState() 9517 */ 9518 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 9519 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 9520 mPrivateFlags &= ~SAVE_STATE_CALLED; 9521 Parcelable state = onSaveInstanceState(); 9522 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9523 throw new IllegalStateException( 9524 "Derived class did not call super.onSaveInstanceState()"); 9525 } 9526 if (state != null) { 9527 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 9528 // + ": " + state); 9529 container.put(mID, state); 9530 } 9531 } 9532 } 9533 9534 /** 9535 * Hook allowing a view to generate a representation of its internal state 9536 * that can later be used to create a new instance with that same state. 9537 * This state should only contain information that is not persistent or can 9538 * not be reconstructed later. For example, you will never store your 9539 * current position on screen because that will be computed again when a 9540 * new instance of the view is placed in its view hierarchy. 9541 * <p> 9542 * Some examples of things you may store here: the current cursor position 9543 * in a text view (but usually not the text itself since that is stored in a 9544 * content provider or other persistent storage), the currently selected 9545 * item in a list view. 9546 * 9547 * @return Returns a Parcelable object containing the view's current dynamic 9548 * state, or null if there is nothing interesting to save. The 9549 * default implementation returns null. 9550 * @see #onRestoreInstanceState(android.os.Parcelable) 9551 * @see #saveHierarchyState(android.util.SparseArray) 9552 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9553 * @see #setSaveEnabled(boolean) 9554 */ 9555 protected Parcelable onSaveInstanceState() { 9556 mPrivateFlags |= SAVE_STATE_CALLED; 9557 return BaseSavedState.EMPTY_STATE; 9558 } 9559 9560 /** 9561 * Restore this view hierarchy's frozen state from the given container. 9562 * 9563 * @param container The SparseArray which holds previously frozen states. 9564 * 9565 * @see #saveHierarchyState(android.util.SparseArray) 9566 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9567 * @see #onRestoreInstanceState(android.os.Parcelable) 9568 */ 9569 public void restoreHierarchyState(SparseArray<Parcelable> container) { 9570 dispatchRestoreInstanceState(container); 9571 } 9572 9573 /** 9574 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 9575 * state for this view and its children. May be overridden to modify how restoring 9576 * happens to a view's children; for example, some views may want to not store state 9577 * for their children. 9578 * 9579 * @param container The SparseArray which holds previously saved state. 9580 * 9581 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9582 * @see #restoreHierarchyState(android.util.SparseArray) 9583 * @see #onRestoreInstanceState(android.os.Parcelable) 9584 */ 9585 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 9586 if (mID != NO_ID) { 9587 Parcelable state = container.get(mID); 9588 if (state != null) { 9589 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 9590 // + ": " + state); 9591 mPrivateFlags &= ~SAVE_STATE_CALLED; 9592 onRestoreInstanceState(state); 9593 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9594 throw new IllegalStateException( 9595 "Derived class did not call super.onRestoreInstanceState()"); 9596 } 9597 } 9598 } 9599 } 9600 9601 /** 9602 * Hook allowing a view to re-apply a representation of its internal state that had previously 9603 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 9604 * null state. 9605 * 9606 * @param state The frozen state that had previously been returned by 9607 * {@link #onSaveInstanceState}. 9608 * 9609 * @see #onSaveInstanceState() 9610 * @see #restoreHierarchyState(android.util.SparseArray) 9611 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9612 */ 9613 protected void onRestoreInstanceState(Parcelable state) { 9614 mPrivateFlags |= SAVE_STATE_CALLED; 9615 if (state != BaseSavedState.EMPTY_STATE && state != null) { 9616 throw new IllegalArgumentException("Wrong state class, expecting View State but " 9617 + "received " + state.getClass().toString() + " instead. This usually happens " 9618 + "when two views of different type have the same id in the same hierarchy. " 9619 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 9620 + "other views do not use the same id."); 9621 } 9622 } 9623 9624 /** 9625 * <p>Return the time at which the drawing of the view hierarchy started.</p> 9626 * 9627 * @return the drawing start time in milliseconds 9628 */ 9629 public long getDrawingTime() { 9630 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 9631 } 9632 9633 /** 9634 * <p>Enables or disables the duplication of the parent's state into this view. When 9635 * duplication is enabled, this view gets its drawable state from its parent rather 9636 * than from its own internal properties.</p> 9637 * 9638 * <p>Note: in the current implementation, setting this property to true after the 9639 * view was added to a ViewGroup might have no effect at all. This property should 9640 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 9641 * 9642 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 9643 * property is enabled, an exception will be thrown.</p> 9644 * 9645 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 9646 * parent, these states should not be affected by this method.</p> 9647 * 9648 * @param enabled True to enable duplication of the parent's drawable state, false 9649 * to disable it. 9650 * 9651 * @see #getDrawableState() 9652 * @see #isDuplicateParentStateEnabled() 9653 */ 9654 public void setDuplicateParentStateEnabled(boolean enabled) { 9655 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 9656 } 9657 9658 /** 9659 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 9660 * 9661 * @return True if this view's drawable state is duplicated from the parent, 9662 * false otherwise 9663 * 9664 * @see #getDrawableState() 9665 * @see #setDuplicateParentStateEnabled(boolean) 9666 */ 9667 public boolean isDuplicateParentStateEnabled() { 9668 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 9669 } 9670 9671 /** 9672 * <p>Specifies the type of layer backing this view. The layer can be 9673 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 9674 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 9675 * 9676 * <p>A layer is associated with an optional {@link android.graphics.Paint} 9677 * instance that controls how the layer is composed on screen. The following 9678 * properties of the paint are taken into account when composing the layer:</p> 9679 * <ul> 9680 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 9681 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 9682 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 9683 * </ul> 9684 * 9685 * <p>If this view has an alpha value set to < 1.0 by calling 9686 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 9687 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 9688 * equivalent to setting a hardware layer on this view and providing a paint with 9689 * the desired alpha value.<p> 9690 * 9691 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 9692 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 9693 * for more information on when and how to use layers.</p> 9694 * 9695 * @param layerType The ype of layer to use with this view, must be one of 9696 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9697 * {@link #LAYER_TYPE_HARDWARE} 9698 * @param paint The paint used to compose the layer. This argument is optional 9699 * and can be null. It is ignored when the layer type is 9700 * {@link #LAYER_TYPE_NONE} 9701 * 9702 * @see #getLayerType() 9703 * @see #LAYER_TYPE_NONE 9704 * @see #LAYER_TYPE_SOFTWARE 9705 * @see #LAYER_TYPE_HARDWARE 9706 * @see #setAlpha(float) 9707 * 9708 * @attr ref android.R.styleable#View_layerType 9709 */ 9710 public void setLayerType(int layerType, Paint paint) { 9711 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 9712 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 9713 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 9714 } 9715 9716 if (layerType == mLayerType) { 9717 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 9718 mLayerPaint = paint == null ? new Paint() : paint; 9719 invalidateParentCaches(); 9720 invalidate(true); 9721 } 9722 return; 9723 } 9724 9725 // Destroy any previous software drawing cache if needed 9726 switch (mLayerType) { 9727 case LAYER_TYPE_HARDWARE: 9728 destroyLayer(); 9729 // fall through - unaccelerated views may use software layer mechanism instead 9730 case LAYER_TYPE_SOFTWARE: 9731 destroyDrawingCache(); 9732 break; 9733 default: 9734 break; 9735 } 9736 9737 mLayerType = layerType; 9738 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 9739 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 9740 mLocalDirtyRect = layerDisabled ? null : new Rect(); 9741 9742 invalidateParentCaches(); 9743 invalidate(true); 9744 } 9745 9746 /** 9747 * Indicates what type of layer is currently associated with this view. By default 9748 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 9749 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 9750 * for more information on the different types of layers. 9751 * 9752 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9753 * {@link #LAYER_TYPE_HARDWARE} 9754 * 9755 * @see #setLayerType(int, android.graphics.Paint) 9756 * @see #buildLayer() 9757 * @see #LAYER_TYPE_NONE 9758 * @see #LAYER_TYPE_SOFTWARE 9759 * @see #LAYER_TYPE_HARDWARE 9760 */ 9761 public int getLayerType() { 9762 return mLayerType; 9763 } 9764 9765 /** 9766 * Forces this view's layer to be created and this view to be rendered 9767 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 9768 * invoking this method will have no effect. 9769 * 9770 * This method can for instance be used to render a view into its layer before 9771 * starting an animation. If this view is complex, rendering into the layer 9772 * before starting the animation will avoid skipping frames. 9773 * 9774 * @throws IllegalStateException If this view is not attached to a window 9775 * 9776 * @see #setLayerType(int, android.graphics.Paint) 9777 */ 9778 public void buildLayer() { 9779 if (mLayerType == LAYER_TYPE_NONE) return; 9780 9781 if (mAttachInfo == null) { 9782 throw new IllegalStateException("This view must be attached to a window first"); 9783 } 9784 9785 switch (mLayerType) { 9786 case LAYER_TYPE_HARDWARE: 9787 getHardwareLayer(); 9788 break; 9789 case LAYER_TYPE_SOFTWARE: 9790 buildDrawingCache(true); 9791 break; 9792 } 9793 } 9794 9795 /** 9796 * <p>Returns a hardware layer that can be used to draw this view again 9797 * without executing its draw method.</p> 9798 * 9799 * @return A HardwareLayer ready to render, or null if an error occurred. 9800 */ 9801 HardwareLayer getHardwareLayer() { 9802 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 9803 !mAttachInfo.mHardwareRenderer.isEnabled()) { 9804 return null; 9805 } 9806 9807 final int width = mRight - mLeft; 9808 final int height = mBottom - mTop; 9809 9810 if (width == 0 || height == 0) { 9811 return null; 9812 } 9813 9814 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 9815 if (mHardwareLayer == null) { 9816 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 9817 width, height, isOpaque()); 9818 mLocalDirtyRect.setEmpty(); 9819 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 9820 mHardwareLayer.resize(width, height); 9821 mLocalDirtyRect.setEmpty(); 9822 } 9823 9824 HardwareCanvas currentCanvas = mAttachInfo.mHardwareCanvas; 9825 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 9826 mAttachInfo.mHardwareCanvas = canvas; 9827 try { 9828 canvas.setViewport(width, height); 9829 canvas.onPreDraw(mLocalDirtyRect); 9830 mLocalDirtyRect.setEmpty(); 9831 9832 final int restoreCount = canvas.save(); 9833 9834 computeScroll(); 9835 canvas.translate(-mScrollX, -mScrollY); 9836 9837 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9838 9839 // Fast path for layouts with no backgrounds 9840 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9841 mPrivateFlags &= ~DIRTY_MASK; 9842 dispatchDraw(canvas); 9843 } else { 9844 draw(canvas); 9845 } 9846 9847 canvas.restoreToCount(restoreCount); 9848 } finally { 9849 canvas.onPostDraw(); 9850 mHardwareLayer.end(currentCanvas); 9851 mAttachInfo.mHardwareCanvas = currentCanvas; 9852 } 9853 } 9854 9855 return mHardwareLayer; 9856 } 9857 9858 boolean destroyLayer() { 9859 if (mHardwareLayer != null) { 9860 mHardwareLayer.destroy(); 9861 mHardwareLayer = null; 9862 return true; 9863 } 9864 return false; 9865 } 9866 9867 /** 9868 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 9869 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 9870 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 9871 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 9872 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 9873 * null.</p> 9874 * 9875 * <p>Enabling the drawing cache is similar to 9876 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 9877 * acceleration is turned off. When hardware acceleration is turned on, enabling the 9878 * drawing cache has no effect on rendering because the system uses a different mechanism 9879 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 9880 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 9881 * for information on how to enable software and hardware layers.</p> 9882 * 9883 * <p>This API can be used to manually generate 9884 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 9885 * {@link #getDrawingCache()}.</p> 9886 * 9887 * @param enabled true to enable the drawing cache, false otherwise 9888 * 9889 * @see #isDrawingCacheEnabled() 9890 * @see #getDrawingCache() 9891 * @see #buildDrawingCache() 9892 * @see #setLayerType(int, android.graphics.Paint) 9893 */ 9894 public void setDrawingCacheEnabled(boolean enabled) { 9895 mCachingFailed = false; 9896 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 9897 } 9898 9899 /** 9900 * <p>Indicates whether the drawing cache is enabled for this view.</p> 9901 * 9902 * @return true if the drawing cache is enabled 9903 * 9904 * @see #setDrawingCacheEnabled(boolean) 9905 * @see #getDrawingCache() 9906 */ 9907 @ViewDebug.ExportedProperty(category = "drawing") 9908 public boolean isDrawingCacheEnabled() { 9909 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 9910 } 9911 9912 /** 9913 * Debugging utility which recursively outputs the dirty state of a view and its 9914 * descendants. 9915 * 9916 * @hide 9917 */ 9918 @SuppressWarnings({"UnusedDeclaration"}) 9919 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 9920 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 9921 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 9922 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 9923 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 9924 if (clear) { 9925 mPrivateFlags &= clearMask; 9926 } 9927 if (this instanceof ViewGroup) { 9928 ViewGroup parent = (ViewGroup) this; 9929 final int count = parent.getChildCount(); 9930 for (int i = 0; i < count; i++) { 9931 final View child = parent.getChildAt(i); 9932 child.outputDirtyFlags(indent + " ", clear, clearMask); 9933 } 9934 } 9935 } 9936 9937 /** 9938 * This method is used by ViewGroup to cause its children to restore or recreate their 9939 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 9940 * to recreate its own display list, which would happen if it went through the normal 9941 * draw/dispatchDraw mechanisms. 9942 * 9943 * @hide 9944 */ 9945 protected void dispatchGetDisplayList() {} 9946 9947 /** 9948 * A view that is not attached or hardware accelerated cannot create a display list. 9949 * This method checks these conditions and returns the appropriate result. 9950 * 9951 * @return true if view has the ability to create a display list, false otherwise. 9952 * 9953 * @hide 9954 */ 9955 public boolean canHaveDisplayList() { 9956 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 9957 } 9958 9959 /** 9960 * <p>Returns a display list that can be used to draw this view again 9961 * without executing its draw method.</p> 9962 * 9963 * @return A DisplayList ready to replay, or null if caching is not enabled. 9964 * 9965 * @hide 9966 */ 9967 public DisplayList getDisplayList() { 9968 if (!canHaveDisplayList()) { 9969 return null; 9970 } 9971 9972 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 9973 mDisplayList == null || !mDisplayList.isValid() || 9974 mRecreateDisplayList)) { 9975 // Don't need to recreate the display list, just need to tell our 9976 // children to restore/recreate theirs 9977 if (mDisplayList != null && mDisplayList.isValid() && 9978 !mRecreateDisplayList) { 9979 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9980 mPrivateFlags &= ~DIRTY_MASK; 9981 dispatchGetDisplayList(); 9982 9983 return mDisplayList; 9984 } 9985 9986 // If we got here, we're recreating it. Mark it as such to ensure that 9987 // we copy in child display lists into ours in drawChild() 9988 mRecreateDisplayList = true; 9989 if (mDisplayList == null) { 9990 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 9991 // If we're creating a new display list, make sure our parent gets invalidated 9992 // since they will need to recreate their display list to account for this 9993 // new child display list. 9994 invalidateParentCaches(); 9995 } 9996 9997 final HardwareCanvas canvas = mDisplayList.start(); 9998 try { 9999 int width = mRight - mLeft; 10000 int height = mBottom - mTop; 10001 10002 canvas.setViewport(width, height); 10003 // The dirty rect should always be null for a display list 10004 canvas.onPreDraw(null); 10005 10006 computeScroll(); 10007 canvas.translate(-mScrollX, -mScrollY); 10008 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10009 mPrivateFlags &= ~DIRTY_MASK; 10010 10011 // Fast path for layouts with no backgrounds 10012 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10013 dispatchDraw(canvas); 10014 } else { 10015 draw(canvas); 10016 } 10017 } finally { 10018 canvas.onPostDraw(); 10019 10020 mDisplayList.end(); 10021 } 10022 } else { 10023 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10024 mPrivateFlags &= ~DIRTY_MASK; 10025 } 10026 10027 return mDisplayList; 10028 } 10029 10030 /** 10031 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 10032 * 10033 * @return A non-scaled bitmap representing this view or null if cache is disabled. 10034 * 10035 * @see #getDrawingCache(boolean) 10036 */ 10037 public Bitmap getDrawingCache() { 10038 return getDrawingCache(false); 10039 } 10040 10041 /** 10042 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 10043 * is null when caching is disabled. If caching is enabled and the cache is not ready, 10044 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 10045 * draw from the cache when the cache is enabled. To benefit from the cache, you must 10046 * request the drawing cache by calling this method and draw it on screen if the 10047 * returned bitmap is not null.</p> 10048 * 10049 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10050 * this method will create a bitmap of the same size as this view. Because this bitmap 10051 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10052 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10053 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10054 * size than the view. This implies that your application must be able to handle this 10055 * size.</p> 10056 * 10057 * @param autoScale Indicates whether the generated bitmap should be scaled based on 10058 * the current density of the screen when the application is in compatibility 10059 * mode. 10060 * 10061 * @return A bitmap representing this view or null if cache is disabled. 10062 * 10063 * @see #setDrawingCacheEnabled(boolean) 10064 * @see #isDrawingCacheEnabled() 10065 * @see #buildDrawingCache(boolean) 10066 * @see #destroyDrawingCache() 10067 */ 10068 public Bitmap getDrawingCache(boolean autoScale) { 10069 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 10070 return null; 10071 } 10072 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 10073 buildDrawingCache(autoScale); 10074 } 10075 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 10076 } 10077 10078 /** 10079 * <p>Frees the resources used by the drawing cache. If you call 10080 * {@link #buildDrawingCache()} manually without calling 10081 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10082 * should cleanup the cache with this method afterwards.</p> 10083 * 10084 * @see #setDrawingCacheEnabled(boolean) 10085 * @see #buildDrawingCache() 10086 * @see #getDrawingCache() 10087 */ 10088 public void destroyDrawingCache() { 10089 if (mDrawingCache != null) { 10090 mDrawingCache.recycle(); 10091 mDrawingCache = null; 10092 } 10093 if (mUnscaledDrawingCache != null) { 10094 mUnscaledDrawingCache.recycle(); 10095 mUnscaledDrawingCache = null; 10096 } 10097 } 10098 10099 /** 10100 * Setting a solid background color for the drawing cache's bitmaps will improve 10101 * perfromance and memory usage. Note, though that this should only be used if this 10102 * view will always be drawn on top of a solid color. 10103 * 10104 * @param color The background color to use for the drawing cache's bitmap 10105 * 10106 * @see #setDrawingCacheEnabled(boolean) 10107 * @see #buildDrawingCache() 10108 * @see #getDrawingCache() 10109 */ 10110 public void setDrawingCacheBackgroundColor(int color) { 10111 if (color != mDrawingCacheBackgroundColor) { 10112 mDrawingCacheBackgroundColor = color; 10113 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10114 } 10115 } 10116 10117 /** 10118 * @see #setDrawingCacheBackgroundColor(int) 10119 * 10120 * @return The background color to used for the drawing cache's bitmap 10121 */ 10122 public int getDrawingCacheBackgroundColor() { 10123 return mDrawingCacheBackgroundColor; 10124 } 10125 10126 /** 10127 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 10128 * 10129 * @see #buildDrawingCache(boolean) 10130 */ 10131 public void buildDrawingCache() { 10132 buildDrawingCache(false); 10133 } 10134 10135 /** 10136 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 10137 * 10138 * <p>If you call {@link #buildDrawingCache()} manually without calling 10139 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10140 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 10141 * 10142 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10143 * this method will create a bitmap of the same size as this view. Because this bitmap 10144 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10145 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10146 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10147 * size than the view. This implies that your application must be able to handle this 10148 * size.</p> 10149 * 10150 * <p>You should avoid calling this method when hardware acceleration is enabled. If 10151 * you do not need the drawing cache bitmap, calling this method will increase memory 10152 * usage and cause the view to be rendered in software once, thus negatively impacting 10153 * performance.</p> 10154 * 10155 * @see #getDrawingCache() 10156 * @see #destroyDrawingCache() 10157 */ 10158 public void buildDrawingCache(boolean autoScale) { 10159 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 10160 mDrawingCache == null : mUnscaledDrawingCache == null)) { 10161 mCachingFailed = false; 10162 10163 if (ViewDebug.TRACE_HIERARCHY) { 10164 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 10165 } 10166 10167 int width = mRight - mLeft; 10168 int height = mBottom - mTop; 10169 10170 final AttachInfo attachInfo = mAttachInfo; 10171 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 10172 10173 if (autoScale && scalingRequired) { 10174 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 10175 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 10176 } 10177 10178 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 10179 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 10180 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 10181 10182 if (width <= 0 || height <= 0 || 10183 // Projected bitmap size in bytes 10184 (width * height * (opaque && !use32BitCache ? 2 : 4) > 10185 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 10186 destroyDrawingCache(); 10187 mCachingFailed = true; 10188 return; 10189 } 10190 10191 boolean clear = true; 10192 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 10193 10194 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 10195 Bitmap.Config quality; 10196 if (!opaque) { 10197 // Never pick ARGB_4444 because it looks awful 10198 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 10199 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 10200 case DRAWING_CACHE_QUALITY_AUTO: 10201 quality = Bitmap.Config.ARGB_8888; 10202 break; 10203 case DRAWING_CACHE_QUALITY_LOW: 10204 quality = Bitmap.Config.ARGB_8888; 10205 break; 10206 case DRAWING_CACHE_QUALITY_HIGH: 10207 quality = Bitmap.Config.ARGB_8888; 10208 break; 10209 default: 10210 quality = Bitmap.Config.ARGB_8888; 10211 break; 10212 } 10213 } else { 10214 // Optimization for translucent windows 10215 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 10216 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 10217 } 10218 10219 // Try to cleanup memory 10220 if (bitmap != null) bitmap.recycle(); 10221 10222 try { 10223 bitmap = Bitmap.createBitmap(width, height, quality); 10224 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10225 if (autoScale) { 10226 mDrawingCache = bitmap; 10227 } else { 10228 mUnscaledDrawingCache = bitmap; 10229 } 10230 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 10231 } catch (OutOfMemoryError e) { 10232 // If there is not enough memory to create the bitmap cache, just 10233 // ignore the issue as bitmap caches are not required to draw the 10234 // view hierarchy 10235 if (autoScale) { 10236 mDrawingCache = null; 10237 } else { 10238 mUnscaledDrawingCache = null; 10239 } 10240 mCachingFailed = true; 10241 return; 10242 } 10243 10244 clear = drawingCacheBackgroundColor != 0; 10245 } 10246 10247 Canvas canvas; 10248 if (attachInfo != null) { 10249 canvas = attachInfo.mCanvas; 10250 if (canvas == null) { 10251 canvas = new Canvas(); 10252 } 10253 canvas.setBitmap(bitmap); 10254 // Temporarily clobber the cached Canvas in case one of our children 10255 // is also using a drawing cache. Without this, the children would 10256 // steal the canvas by attaching their own bitmap to it and bad, bad 10257 // thing would happen (invisible views, corrupted drawings, etc.) 10258 attachInfo.mCanvas = null; 10259 } else { 10260 // This case should hopefully never or seldom happen 10261 canvas = new Canvas(bitmap); 10262 } 10263 10264 if (clear) { 10265 bitmap.eraseColor(drawingCacheBackgroundColor); 10266 } 10267 10268 computeScroll(); 10269 final int restoreCount = canvas.save(); 10270 10271 if (autoScale && scalingRequired) { 10272 final float scale = attachInfo.mApplicationScale; 10273 canvas.scale(scale, scale); 10274 } 10275 10276 canvas.translate(-mScrollX, -mScrollY); 10277 10278 mPrivateFlags |= DRAWN; 10279 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 10280 mLayerType != LAYER_TYPE_NONE) { 10281 mPrivateFlags |= DRAWING_CACHE_VALID; 10282 } 10283 10284 // Fast path for layouts with no backgrounds 10285 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10286 if (ViewDebug.TRACE_HIERARCHY) { 10287 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10288 } 10289 mPrivateFlags &= ~DIRTY_MASK; 10290 dispatchDraw(canvas); 10291 } else { 10292 draw(canvas); 10293 } 10294 10295 canvas.restoreToCount(restoreCount); 10296 canvas.setBitmap(null); 10297 10298 if (attachInfo != null) { 10299 // Restore the cached Canvas for our siblings 10300 attachInfo.mCanvas = canvas; 10301 } 10302 } 10303 } 10304 10305 /** 10306 * Create a snapshot of the view into a bitmap. We should probably make 10307 * some form of this public, but should think about the API. 10308 */ 10309 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 10310 int width = mRight - mLeft; 10311 int height = mBottom - mTop; 10312 10313 final AttachInfo attachInfo = mAttachInfo; 10314 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 10315 width = (int) ((width * scale) + 0.5f); 10316 height = (int) ((height * scale) + 0.5f); 10317 10318 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 10319 if (bitmap == null) { 10320 throw new OutOfMemoryError(); 10321 } 10322 10323 Resources resources = getResources(); 10324 if (resources != null) { 10325 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 10326 } 10327 10328 Canvas canvas; 10329 if (attachInfo != null) { 10330 canvas = attachInfo.mCanvas; 10331 if (canvas == null) { 10332 canvas = new Canvas(); 10333 } 10334 canvas.setBitmap(bitmap); 10335 // Temporarily clobber the cached Canvas in case one of our children 10336 // is also using a drawing cache. Without this, the children would 10337 // steal the canvas by attaching their own bitmap to it and bad, bad 10338 // things would happen (invisible views, corrupted drawings, etc.) 10339 attachInfo.mCanvas = null; 10340 } else { 10341 // This case should hopefully never or seldom happen 10342 canvas = new Canvas(bitmap); 10343 } 10344 10345 if ((backgroundColor & 0xff000000) != 0) { 10346 bitmap.eraseColor(backgroundColor); 10347 } 10348 10349 computeScroll(); 10350 final int restoreCount = canvas.save(); 10351 canvas.scale(scale, scale); 10352 canvas.translate(-mScrollX, -mScrollY); 10353 10354 // Temporarily remove the dirty mask 10355 int flags = mPrivateFlags; 10356 mPrivateFlags &= ~DIRTY_MASK; 10357 10358 // Fast path for layouts with no backgrounds 10359 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10360 dispatchDraw(canvas); 10361 } else { 10362 draw(canvas); 10363 } 10364 10365 mPrivateFlags = flags; 10366 10367 canvas.restoreToCount(restoreCount); 10368 canvas.setBitmap(null); 10369 10370 if (attachInfo != null) { 10371 // Restore the cached Canvas for our siblings 10372 attachInfo.mCanvas = canvas; 10373 } 10374 10375 return bitmap; 10376 } 10377 10378 /** 10379 * Indicates whether this View is currently in edit mode. A View is usually 10380 * in edit mode when displayed within a developer tool. For instance, if 10381 * this View is being drawn by a visual user interface builder, this method 10382 * should return true. 10383 * 10384 * Subclasses should check the return value of this method to provide 10385 * different behaviors if their normal behavior might interfere with the 10386 * host environment. For instance: the class spawns a thread in its 10387 * constructor, the drawing code relies on device-specific features, etc. 10388 * 10389 * This method is usually checked in the drawing code of custom widgets. 10390 * 10391 * @return True if this View is in edit mode, false otherwise. 10392 */ 10393 public boolean isInEditMode() { 10394 return false; 10395 } 10396 10397 /** 10398 * If the View draws content inside its padding and enables fading edges, 10399 * it needs to support padding offsets. Padding offsets are added to the 10400 * fading edges to extend the length of the fade so that it covers pixels 10401 * drawn inside the padding. 10402 * 10403 * Subclasses of this class should override this method if they need 10404 * to draw content inside the padding. 10405 * 10406 * @return True if padding offset must be applied, false otherwise. 10407 * 10408 * @see #getLeftPaddingOffset() 10409 * @see #getRightPaddingOffset() 10410 * @see #getTopPaddingOffset() 10411 * @see #getBottomPaddingOffset() 10412 * 10413 * @since CURRENT 10414 */ 10415 protected boolean isPaddingOffsetRequired() { 10416 return false; 10417 } 10418 10419 /** 10420 * Amount by which to extend the left fading region. Called only when 10421 * {@link #isPaddingOffsetRequired()} returns true. 10422 * 10423 * @return The left padding offset in pixels. 10424 * 10425 * @see #isPaddingOffsetRequired() 10426 * 10427 * @since CURRENT 10428 */ 10429 protected int getLeftPaddingOffset() { 10430 return 0; 10431 } 10432 10433 /** 10434 * Amount by which to extend the right fading region. Called only when 10435 * {@link #isPaddingOffsetRequired()} returns true. 10436 * 10437 * @return The right padding offset in pixels. 10438 * 10439 * @see #isPaddingOffsetRequired() 10440 * 10441 * @since CURRENT 10442 */ 10443 protected int getRightPaddingOffset() { 10444 return 0; 10445 } 10446 10447 /** 10448 * Amount by which to extend the top fading region. Called only when 10449 * {@link #isPaddingOffsetRequired()} returns true. 10450 * 10451 * @return The top padding offset in pixels. 10452 * 10453 * @see #isPaddingOffsetRequired() 10454 * 10455 * @since CURRENT 10456 */ 10457 protected int getTopPaddingOffset() { 10458 return 0; 10459 } 10460 10461 /** 10462 * Amount by which to extend the bottom fading region. Called only when 10463 * {@link #isPaddingOffsetRequired()} returns true. 10464 * 10465 * @return The bottom padding offset in pixels. 10466 * 10467 * @see #isPaddingOffsetRequired() 10468 * 10469 * @since CURRENT 10470 */ 10471 protected int getBottomPaddingOffset() { 10472 return 0; 10473 } 10474 10475 /** 10476 * @hide 10477 * @param offsetRequired 10478 */ 10479 protected int getFadeTop(boolean offsetRequired) { 10480 int top = mPaddingTop; 10481 if (offsetRequired) top += getTopPaddingOffset(); 10482 return top; 10483 } 10484 10485 /** 10486 * @hide 10487 * @param offsetRequired 10488 */ 10489 protected int getFadeHeight(boolean offsetRequired) { 10490 int padding = mPaddingTop; 10491 if (offsetRequired) padding += getTopPaddingOffset(); 10492 return mBottom - mTop - mPaddingBottom - padding; 10493 } 10494 10495 /** 10496 * <p>Indicates whether this view is attached to an hardware accelerated 10497 * window or not.</p> 10498 * 10499 * <p>Even if this method returns true, it does not mean that every call 10500 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 10501 * accelerated {@link android.graphics.Canvas}. For instance, if this view 10502 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 10503 * window is hardware accelerated, 10504 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 10505 * return false, and this method will return true.</p> 10506 * 10507 * @return True if the view is attached to a window and the window is 10508 * hardware accelerated; false in any other case. 10509 */ 10510 public boolean isHardwareAccelerated() { 10511 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 10512 } 10513 10514 /** 10515 * Manually render this view (and all of its children) to the given Canvas. 10516 * The view must have already done a full layout before this function is 10517 * called. When implementing a view, implement 10518 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 10519 * If you do need to override this method, call the superclass version. 10520 * 10521 * @param canvas The Canvas to which the View is rendered. 10522 */ 10523 public void draw(Canvas canvas) { 10524 if (ViewDebug.TRACE_HIERARCHY) { 10525 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10526 } 10527 10528 final int privateFlags = mPrivateFlags; 10529 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 10530 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 10531 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 10532 10533 /* 10534 * Draw traversal performs several drawing steps which must be executed 10535 * in the appropriate order: 10536 * 10537 * 1. Draw the background 10538 * 2. If necessary, save the canvas' layers to prepare for fading 10539 * 3. Draw view's content 10540 * 4. Draw children 10541 * 5. If necessary, draw the fading edges and restore layers 10542 * 6. Draw decorations (scrollbars for instance) 10543 */ 10544 10545 // Step 1, draw the background, if needed 10546 int saveCount; 10547 10548 if (!dirtyOpaque) { 10549 final Drawable background = mBGDrawable; 10550 if (background != null) { 10551 final int scrollX = mScrollX; 10552 final int scrollY = mScrollY; 10553 10554 if (mBackgroundSizeChanged) { 10555 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 10556 mBackgroundSizeChanged = false; 10557 } 10558 10559 if ((scrollX | scrollY) == 0) { 10560 background.draw(canvas); 10561 } else { 10562 canvas.translate(scrollX, scrollY); 10563 background.draw(canvas); 10564 canvas.translate(-scrollX, -scrollY); 10565 } 10566 } 10567 } 10568 10569 // skip step 2 & 5 if possible (common case) 10570 final int viewFlags = mViewFlags; 10571 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 10572 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 10573 if (!verticalEdges && !horizontalEdges) { 10574 // Step 3, draw the content 10575 if (!dirtyOpaque) onDraw(canvas); 10576 10577 // Step 4, draw the children 10578 dispatchDraw(canvas); 10579 10580 // Step 6, draw decorations (scrollbars) 10581 onDrawScrollBars(canvas); 10582 10583 // we're done... 10584 return; 10585 } 10586 10587 /* 10588 * Here we do the full fledged routine... 10589 * (this is an uncommon case where speed matters less, 10590 * this is why we repeat some of the tests that have been 10591 * done above) 10592 */ 10593 10594 boolean drawTop = false; 10595 boolean drawBottom = false; 10596 boolean drawLeft = false; 10597 boolean drawRight = false; 10598 10599 float topFadeStrength = 0.0f; 10600 float bottomFadeStrength = 0.0f; 10601 float leftFadeStrength = 0.0f; 10602 float rightFadeStrength = 0.0f; 10603 10604 // Step 2, save the canvas' layers 10605 int paddingLeft = mPaddingLeft; 10606 10607 final boolean offsetRequired = isPaddingOffsetRequired(); 10608 if (offsetRequired) { 10609 paddingLeft += getLeftPaddingOffset(); 10610 } 10611 10612 int left = mScrollX + paddingLeft; 10613 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 10614 int top = mScrollY + getFadeTop(offsetRequired); 10615 int bottom = top + getFadeHeight(offsetRequired); 10616 10617 if (offsetRequired) { 10618 right += getRightPaddingOffset(); 10619 bottom += getBottomPaddingOffset(); 10620 } 10621 10622 final ScrollabilityCache scrollabilityCache = mScrollCache; 10623 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 10624 int length = (int) fadeHeight; 10625 10626 // clip the fade length if top and bottom fades overlap 10627 // overlapping fades produce odd-looking artifacts 10628 if (verticalEdges && (top + length > bottom - length)) { 10629 length = (bottom - top) / 2; 10630 } 10631 10632 // also clip horizontal fades if necessary 10633 if (horizontalEdges && (left + length > right - length)) { 10634 length = (right - left) / 2; 10635 } 10636 10637 if (verticalEdges) { 10638 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 10639 drawTop = topFadeStrength * fadeHeight > 1.0f; 10640 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 10641 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 10642 } 10643 10644 if (horizontalEdges) { 10645 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 10646 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 10647 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 10648 drawRight = rightFadeStrength * fadeHeight > 1.0f; 10649 } 10650 10651 saveCount = canvas.getSaveCount(); 10652 10653 int solidColor = getSolidColor(); 10654 if (solidColor == 0) { 10655 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 10656 10657 if (drawTop) { 10658 canvas.saveLayer(left, top, right, top + length, null, flags); 10659 } 10660 10661 if (drawBottom) { 10662 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 10663 } 10664 10665 if (drawLeft) { 10666 canvas.saveLayer(left, top, left + length, bottom, null, flags); 10667 } 10668 10669 if (drawRight) { 10670 canvas.saveLayer(right - length, top, right, bottom, null, flags); 10671 } 10672 } else { 10673 scrollabilityCache.setFadeColor(solidColor); 10674 } 10675 10676 // Step 3, draw the content 10677 if (!dirtyOpaque) onDraw(canvas); 10678 10679 // Step 4, draw the children 10680 dispatchDraw(canvas); 10681 10682 // Step 5, draw the fade effect and restore layers 10683 final Paint p = scrollabilityCache.paint; 10684 final Matrix matrix = scrollabilityCache.matrix; 10685 final Shader fade = scrollabilityCache.shader; 10686 10687 if (drawTop) { 10688 matrix.setScale(1, fadeHeight * topFadeStrength); 10689 matrix.postTranslate(left, top); 10690 fade.setLocalMatrix(matrix); 10691 canvas.drawRect(left, top, right, top + length, p); 10692 } 10693 10694 if (drawBottom) { 10695 matrix.setScale(1, fadeHeight * bottomFadeStrength); 10696 matrix.postRotate(180); 10697 matrix.postTranslate(left, bottom); 10698 fade.setLocalMatrix(matrix); 10699 canvas.drawRect(left, bottom - length, right, bottom, p); 10700 } 10701 10702 if (drawLeft) { 10703 matrix.setScale(1, fadeHeight * leftFadeStrength); 10704 matrix.postRotate(-90); 10705 matrix.postTranslate(left, top); 10706 fade.setLocalMatrix(matrix); 10707 canvas.drawRect(left, top, left + length, bottom, p); 10708 } 10709 10710 if (drawRight) { 10711 matrix.setScale(1, fadeHeight * rightFadeStrength); 10712 matrix.postRotate(90); 10713 matrix.postTranslate(right, top); 10714 fade.setLocalMatrix(matrix); 10715 canvas.drawRect(right - length, top, right, bottom, p); 10716 } 10717 10718 canvas.restoreToCount(saveCount); 10719 10720 // Step 6, draw decorations (scrollbars) 10721 onDrawScrollBars(canvas); 10722 } 10723 10724 /** 10725 * Override this if your view is known to always be drawn on top of a solid color background, 10726 * and needs to draw fading edges. Returning a non-zero color enables the view system to 10727 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 10728 * should be set to 0xFF. 10729 * 10730 * @see #setVerticalFadingEdgeEnabled(boolean) 10731 * @see #setHorizontalFadingEdgeEnabled(boolean) 10732 * 10733 * @return The known solid color background for this view, or 0 if the color may vary 10734 */ 10735 @ViewDebug.ExportedProperty(category = "drawing") 10736 public int getSolidColor() { 10737 return 0; 10738 } 10739 10740 /** 10741 * Build a human readable string representation of the specified view flags. 10742 * 10743 * @param flags the view flags to convert to a string 10744 * @return a String representing the supplied flags 10745 */ 10746 private static String printFlags(int flags) { 10747 String output = ""; 10748 int numFlags = 0; 10749 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 10750 output += "TAKES_FOCUS"; 10751 numFlags++; 10752 } 10753 10754 switch (flags & VISIBILITY_MASK) { 10755 case INVISIBLE: 10756 if (numFlags > 0) { 10757 output += " "; 10758 } 10759 output += "INVISIBLE"; 10760 // USELESS HERE numFlags++; 10761 break; 10762 case GONE: 10763 if (numFlags > 0) { 10764 output += " "; 10765 } 10766 output += "GONE"; 10767 // USELESS HERE numFlags++; 10768 break; 10769 default: 10770 break; 10771 } 10772 return output; 10773 } 10774 10775 /** 10776 * Build a human readable string representation of the specified private 10777 * view flags. 10778 * 10779 * @param privateFlags the private view flags to convert to a string 10780 * @return a String representing the supplied flags 10781 */ 10782 private static String printPrivateFlags(int privateFlags) { 10783 String output = ""; 10784 int numFlags = 0; 10785 10786 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 10787 output += "WANTS_FOCUS"; 10788 numFlags++; 10789 } 10790 10791 if ((privateFlags & FOCUSED) == FOCUSED) { 10792 if (numFlags > 0) { 10793 output += " "; 10794 } 10795 output += "FOCUSED"; 10796 numFlags++; 10797 } 10798 10799 if ((privateFlags & SELECTED) == SELECTED) { 10800 if (numFlags > 0) { 10801 output += " "; 10802 } 10803 output += "SELECTED"; 10804 numFlags++; 10805 } 10806 10807 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 10808 if (numFlags > 0) { 10809 output += " "; 10810 } 10811 output += "IS_ROOT_NAMESPACE"; 10812 numFlags++; 10813 } 10814 10815 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 10816 if (numFlags > 0) { 10817 output += " "; 10818 } 10819 output += "HAS_BOUNDS"; 10820 numFlags++; 10821 } 10822 10823 if ((privateFlags & DRAWN) == DRAWN) { 10824 if (numFlags > 0) { 10825 output += " "; 10826 } 10827 output += "DRAWN"; 10828 // USELESS HERE numFlags++; 10829 } 10830 return output; 10831 } 10832 10833 /** 10834 * <p>Indicates whether or not this view's layout will be requested during 10835 * the next hierarchy layout pass.</p> 10836 * 10837 * @return true if the layout will be forced during next layout pass 10838 */ 10839 public boolean isLayoutRequested() { 10840 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 10841 } 10842 10843 /** 10844 * Assign a size and position to a view and all of its 10845 * descendants 10846 * 10847 * <p>This is the second phase of the layout mechanism. 10848 * (The first is measuring). In this phase, each parent calls 10849 * layout on all of its children to position them. 10850 * This is typically done using the child measurements 10851 * that were stored in the measure pass().</p> 10852 * 10853 * <p>Derived classes should not override this method. 10854 * Derived classes with children should override 10855 * onLayout. In that method, they should 10856 * call layout on each of their children.</p> 10857 * 10858 * @param l Left position, relative to parent 10859 * @param t Top position, relative to parent 10860 * @param r Right position, relative to parent 10861 * @param b Bottom position, relative to parent 10862 */ 10863 @SuppressWarnings({"unchecked"}) 10864 public void layout(int l, int t, int r, int b) { 10865 int oldL = mLeft; 10866 int oldT = mTop; 10867 int oldB = mBottom; 10868 int oldR = mRight; 10869 boolean changed = setFrame(l, t, r, b); 10870 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 10871 if (ViewDebug.TRACE_HIERARCHY) { 10872 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 10873 } 10874 10875 onLayout(changed, l, t, r, b); 10876 mPrivateFlags &= ~LAYOUT_REQUIRED; 10877 10878 if (mOnLayoutChangeListeners != null) { 10879 ArrayList<OnLayoutChangeListener> listenersCopy = 10880 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 10881 int numListeners = listenersCopy.size(); 10882 for (int i = 0; i < numListeners; ++i) { 10883 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 10884 } 10885 } 10886 } 10887 mPrivateFlags &= ~FORCE_LAYOUT; 10888 } 10889 10890 /** 10891 * Called from layout when this view should 10892 * assign a size and position to each of its children. 10893 * 10894 * Derived classes with children should override 10895 * this method and call layout on each of 10896 * their children. 10897 * @param changed This is a new size or position for this view 10898 * @param left Left position, relative to parent 10899 * @param top Top position, relative to parent 10900 * @param right Right position, relative to parent 10901 * @param bottom Bottom position, relative to parent 10902 */ 10903 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 10904 } 10905 10906 /** 10907 * Assign a size and position to this view. 10908 * 10909 * This is called from layout. 10910 * 10911 * @param left Left position, relative to parent 10912 * @param top Top position, relative to parent 10913 * @param right Right position, relative to parent 10914 * @param bottom Bottom position, relative to parent 10915 * @return true if the new size and position are different than the 10916 * previous ones 10917 * {@hide} 10918 */ 10919 protected boolean setFrame(int left, int top, int right, int bottom) { 10920 boolean changed = false; 10921 10922 if (DBG) { 10923 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 10924 + right + "," + bottom + ")"); 10925 } 10926 10927 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 10928 changed = true; 10929 10930 // Remember our drawn bit 10931 int drawn = mPrivateFlags & DRAWN; 10932 10933 int oldWidth = mRight - mLeft; 10934 int oldHeight = mBottom - mTop; 10935 int newWidth = right - left; 10936 int newHeight = bottom - top; 10937 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 10938 10939 // Invalidate our old position 10940 invalidate(sizeChanged); 10941 10942 mLeft = left; 10943 mTop = top; 10944 mRight = right; 10945 mBottom = bottom; 10946 10947 mPrivateFlags |= HAS_BOUNDS; 10948 10949 10950 if (sizeChanged) { 10951 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 10952 // A change in dimension means an auto-centered pivot point changes, too 10953 mMatrixDirty = true; 10954 } 10955 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 10956 } 10957 10958 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 10959 // If we are visible, force the DRAWN bit to on so that 10960 // this invalidate will go through (at least to our parent). 10961 // This is because someone may have invalidated this view 10962 // before this call to setFrame came in, thereby clearing 10963 // the DRAWN bit. 10964 mPrivateFlags |= DRAWN; 10965 invalidate(sizeChanged); 10966 // parent display list may need to be recreated based on a change in the bounds 10967 // of any child 10968 invalidateParentCaches(); 10969 } 10970 10971 // Reset drawn bit to original value (invalidate turns it off) 10972 mPrivateFlags |= drawn; 10973 10974 mBackgroundSizeChanged = true; 10975 } 10976 return changed; 10977 } 10978 10979 /** 10980 * Finalize inflating a view from XML. This is called as the last phase 10981 * of inflation, after all child views have been added. 10982 * 10983 * <p>Even if the subclass overrides onFinishInflate, they should always be 10984 * sure to call the super method, so that we get called. 10985 */ 10986 protected void onFinishInflate() { 10987 } 10988 10989 /** 10990 * Returns the resources associated with this view. 10991 * 10992 * @return Resources object. 10993 */ 10994 public Resources getResources() { 10995 return mResources; 10996 } 10997 10998 /** 10999 * Invalidates the specified Drawable. 11000 * 11001 * @param drawable the drawable to invalidate 11002 */ 11003 public void invalidateDrawable(Drawable drawable) { 11004 if (verifyDrawable(drawable)) { 11005 final Rect dirty = drawable.getBounds(); 11006 final int scrollX = mScrollX; 11007 final int scrollY = mScrollY; 11008 11009 invalidate(dirty.left + scrollX, dirty.top + scrollY, 11010 dirty.right + scrollX, dirty.bottom + scrollY); 11011 } 11012 } 11013 11014 /** 11015 * Schedules an action on a drawable to occur at a specified time. 11016 * 11017 * @param who the recipient of the action 11018 * @param what the action to run on the drawable 11019 * @param when the time at which the action must occur. Uses the 11020 * {@link SystemClock#uptimeMillis} timebase. 11021 */ 11022 public void scheduleDrawable(Drawable who, Runnable what, long when) { 11023 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 11024 mAttachInfo.mHandler.postAtTime(what, who, when); 11025 } 11026 } 11027 11028 /** 11029 * Cancels a scheduled action on a drawable. 11030 * 11031 * @param who the recipient of the action 11032 * @param what the action to cancel 11033 */ 11034 public void unscheduleDrawable(Drawable who, Runnable what) { 11035 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 11036 mAttachInfo.mHandler.removeCallbacks(what, who); 11037 } 11038 } 11039 11040 /** 11041 * Unschedule any events associated with the given Drawable. This can be 11042 * used when selecting a new Drawable into a view, so that the previous 11043 * one is completely unscheduled. 11044 * 11045 * @param who The Drawable to unschedule. 11046 * 11047 * @see #drawableStateChanged 11048 */ 11049 public void unscheduleDrawable(Drawable who) { 11050 if (mAttachInfo != null) { 11051 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 11052 } 11053 } 11054 11055 /** 11056 * Return the layout direction of a given Drawable. 11057 * 11058 * @param who the Drawable to query 11059 * 11060 * @hide 11061 */ 11062 public int getResolvedLayoutDirection(Drawable who) { 11063 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 11064 } 11065 11066 /** 11067 * If your view subclass is displaying its own Drawable objects, it should 11068 * override this function and return true for any Drawable it is 11069 * displaying. This allows animations for those drawables to be 11070 * scheduled. 11071 * 11072 * <p>Be sure to call through to the super class when overriding this 11073 * function. 11074 * 11075 * @param who The Drawable to verify. Return true if it is one you are 11076 * displaying, else return the result of calling through to the 11077 * super class. 11078 * 11079 * @return boolean If true than the Drawable is being displayed in the 11080 * view; else false and it is not allowed to animate. 11081 * 11082 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 11083 * @see #drawableStateChanged() 11084 */ 11085 protected boolean verifyDrawable(Drawable who) { 11086 return who == mBGDrawable; 11087 } 11088 11089 /** 11090 * This function is called whenever the state of the view changes in such 11091 * a way that it impacts the state of drawables being shown. 11092 * 11093 * <p>Be sure to call through to the superclass when overriding this 11094 * function. 11095 * 11096 * @see Drawable#setState(int[]) 11097 */ 11098 protected void drawableStateChanged() { 11099 Drawable d = mBGDrawable; 11100 if (d != null && d.isStateful()) { 11101 d.setState(getDrawableState()); 11102 } 11103 } 11104 11105 /** 11106 * Call this to force a view to update its drawable state. This will cause 11107 * drawableStateChanged to be called on this view. Views that are interested 11108 * in the new state should call getDrawableState. 11109 * 11110 * @see #drawableStateChanged 11111 * @see #getDrawableState 11112 */ 11113 public void refreshDrawableState() { 11114 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11115 drawableStateChanged(); 11116 11117 ViewParent parent = mParent; 11118 if (parent != null) { 11119 parent.childDrawableStateChanged(this); 11120 } 11121 } 11122 11123 /** 11124 * Return an array of resource IDs of the drawable states representing the 11125 * current state of the view. 11126 * 11127 * @return The current drawable state 11128 * 11129 * @see Drawable#setState(int[]) 11130 * @see #drawableStateChanged() 11131 * @see #onCreateDrawableState(int) 11132 */ 11133 public final int[] getDrawableState() { 11134 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 11135 return mDrawableState; 11136 } else { 11137 mDrawableState = onCreateDrawableState(0); 11138 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 11139 return mDrawableState; 11140 } 11141 } 11142 11143 /** 11144 * Generate the new {@link android.graphics.drawable.Drawable} state for 11145 * this view. This is called by the view 11146 * system when the cached Drawable state is determined to be invalid. To 11147 * retrieve the current state, you should use {@link #getDrawableState}. 11148 * 11149 * @param extraSpace if non-zero, this is the number of extra entries you 11150 * would like in the returned array in which you can place your own 11151 * states. 11152 * 11153 * @return Returns an array holding the current {@link Drawable} state of 11154 * the view. 11155 * 11156 * @see #mergeDrawableStates(int[], int[]) 11157 */ 11158 protected int[] onCreateDrawableState(int extraSpace) { 11159 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 11160 mParent instanceof View) { 11161 return ((View) mParent).onCreateDrawableState(extraSpace); 11162 } 11163 11164 int[] drawableState; 11165 11166 int privateFlags = mPrivateFlags; 11167 11168 int viewStateIndex = 0; 11169 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 11170 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 11171 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 11172 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 11173 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 11174 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 11175 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 11176 HardwareRenderer.isAvailable()) { 11177 // This is set if HW acceleration is requested, even if the current 11178 // process doesn't allow it. This is just to allow app preview 11179 // windows to better match their app. 11180 viewStateIndex |= VIEW_STATE_ACCELERATED; 11181 } 11182 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 11183 11184 final int privateFlags2 = mPrivateFlags2; 11185 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 11186 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 11187 11188 drawableState = VIEW_STATE_SETS[viewStateIndex]; 11189 11190 //noinspection ConstantIfStatement 11191 if (false) { 11192 Log.i("View", "drawableStateIndex=" + viewStateIndex); 11193 Log.i("View", toString() 11194 + " pressed=" + ((privateFlags & PRESSED) != 0) 11195 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 11196 + " fo=" + hasFocus() 11197 + " sl=" + ((privateFlags & SELECTED) != 0) 11198 + " wf=" + hasWindowFocus() 11199 + ": " + Arrays.toString(drawableState)); 11200 } 11201 11202 if (extraSpace == 0) { 11203 return drawableState; 11204 } 11205 11206 final int[] fullState; 11207 if (drawableState != null) { 11208 fullState = new int[drawableState.length + extraSpace]; 11209 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 11210 } else { 11211 fullState = new int[extraSpace]; 11212 } 11213 11214 return fullState; 11215 } 11216 11217 /** 11218 * Merge your own state values in <var>additionalState</var> into the base 11219 * state values <var>baseState</var> that were returned by 11220 * {@link #onCreateDrawableState(int)}. 11221 * 11222 * @param baseState The base state values returned by 11223 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 11224 * own additional state values. 11225 * 11226 * @param additionalState The additional state values you would like 11227 * added to <var>baseState</var>; this array is not modified. 11228 * 11229 * @return As a convenience, the <var>baseState</var> array you originally 11230 * passed into the function is returned. 11231 * 11232 * @see #onCreateDrawableState(int) 11233 */ 11234 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 11235 final int N = baseState.length; 11236 int i = N - 1; 11237 while (i >= 0 && baseState[i] == 0) { 11238 i--; 11239 } 11240 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 11241 return baseState; 11242 } 11243 11244 /** 11245 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 11246 * on all Drawable objects associated with this view. 11247 */ 11248 public void jumpDrawablesToCurrentState() { 11249 if (mBGDrawable != null) { 11250 mBGDrawable.jumpToCurrentState(); 11251 } 11252 } 11253 11254 /** 11255 * Sets the background color for this view. 11256 * @param color the color of the background 11257 */ 11258 @RemotableViewMethod 11259 public void setBackgroundColor(int color) { 11260 if (mBGDrawable instanceof ColorDrawable) { 11261 ((ColorDrawable) mBGDrawable).setColor(color); 11262 } else { 11263 setBackgroundDrawable(new ColorDrawable(color)); 11264 } 11265 } 11266 11267 /** 11268 * Set the background to a given resource. The resource should refer to 11269 * a Drawable object or 0 to remove the background. 11270 * @param resid The identifier of the resource. 11271 * @attr ref android.R.styleable#View_background 11272 */ 11273 @RemotableViewMethod 11274 public void setBackgroundResource(int resid) { 11275 if (resid != 0 && resid == mBackgroundResource) { 11276 return; 11277 } 11278 11279 Drawable d= null; 11280 if (resid != 0) { 11281 d = mResources.getDrawable(resid); 11282 } 11283 setBackgroundDrawable(d); 11284 11285 mBackgroundResource = resid; 11286 } 11287 11288 /** 11289 * Set the background to a given Drawable, or remove the background. If the 11290 * background has padding, this View's padding is set to the background's 11291 * padding. However, when a background is removed, this View's padding isn't 11292 * touched. If setting the padding is desired, please use 11293 * {@link #setPadding(int, int, int, int)}. 11294 * 11295 * @param d The Drawable to use as the background, or null to remove the 11296 * background 11297 */ 11298 public void setBackgroundDrawable(Drawable d) { 11299 if (d == mBGDrawable) { 11300 return; 11301 } 11302 11303 boolean requestLayout = false; 11304 11305 mBackgroundResource = 0; 11306 11307 /* 11308 * Regardless of whether we're setting a new background or not, we want 11309 * to clear the previous drawable. 11310 */ 11311 if (mBGDrawable != null) { 11312 mBGDrawable.setCallback(null); 11313 unscheduleDrawable(mBGDrawable); 11314 } 11315 11316 if (d != null) { 11317 Rect padding = sThreadLocal.get(); 11318 if (padding == null) { 11319 padding = new Rect(); 11320 sThreadLocal.set(padding); 11321 } 11322 if (d.getPadding(padding)) { 11323 switch (d.getResolvedLayoutDirectionSelf()) { 11324 case LAYOUT_DIRECTION_RTL: 11325 setPadding(padding.right, padding.top, padding.left, padding.bottom); 11326 break; 11327 case LAYOUT_DIRECTION_LTR: 11328 default: 11329 setPadding(padding.left, padding.top, padding.right, padding.bottom); 11330 } 11331 } 11332 11333 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 11334 // if it has a different minimum size, we should layout again 11335 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 11336 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 11337 requestLayout = true; 11338 } 11339 11340 d.setCallback(this); 11341 if (d.isStateful()) { 11342 d.setState(getDrawableState()); 11343 } 11344 d.setVisible(getVisibility() == VISIBLE, false); 11345 mBGDrawable = d; 11346 11347 if ((mPrivateFlags & SKIP_DRAW) != 0) { 11348 mPrivateFlags &= ~SKIP_DRAW; 11349 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 11350 requestLayout = true; 11351 } 11352 } else { 11353 /* Remove the background */ 11354 mBGDrawable = null; 11355 11356 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 11357 /* 11358 * This view ONLY drew the background before and we're removing 11359 * the background, so now it won't draw anything 11360 * (hence we SKIP_DRAW) 11361 */ 11362 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 11363 mPrivateFlags |= SKIP_DRAW; 11364 } 11365 11366 /* 11367 * When the background is set, we try to apply its padding to this 11368 * View. When the background is removed, we don't touch this View's 11369 * padding. This is noted in the Javadocs. Hence, we don't need to 11370 * requestLayout(), the invalidate() below is sufficient. 11371 */ 11372 11373 // The old background's minimum size could have affected this 11374 // View's layout, so let's requestLayout 11375 requestLayout = true; 11376 } 11377 11378 computeOpaqueFlags(); 11379 11380 if (requestLayout) { 11381 requestLayout(); 11382 } 11383 11384 mBackgroundSizeChanged = true; 11385 invalidate(true); 11386 } 11387 11388 /** 11389 * Gets the background drawable 11390 * @return The drawable used as the background for this view, if any. 11391 */ 11392 public Drawable getBackground() { 11393 return mBGDrawable; 11394 } 11395 11396 /** 11397 * Sets the padding. The view may add on the space required to display 11398 * the scrollbars, depending on the style and visibility of the scrollbars. 11399 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 11400 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 11401 * from the values set in this call. 11402 * 11403 * @attr ref android.R.styleable#View_padding 11404 * @attr ref android.R.styleable#View_paddingBottom 11405 * @attr ref android.R.styleable#View_paddingLeft 11406 * @attr ref android.R.styleable#View_paddingRight 11407 * @attr ref android.R.styleable#View_paddingTop 11408 * @param left the left padding in pixels 11409 * @param top the top padding in pixels 11410 * @param right the right padding in pixels 11411 * @param bottom the bottom padding in pixels 11412 */ 11413 public void setPadding(int left, int top, int right, int bottom) { 11414 boolean changed = false; 11415 11416 mUserPaddingRelative = false; 11417 11418 mUserPaddingLeft = left; 11419 mUserPaddingRight = right; 11420 mUserPaddingBottom = bottom; 11421 11422 final int viewFlags = mViewFlags; 11423 11424 // Common case is there are no scroll bars. 11425 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 11426 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 11427 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 11428 ? 0 : getVerticalScrollbarWidth(); 11429 switch (mVerticalScrollbarPosition) { 11430 case SCROLLBAR_POSITION_DEFAULT: 11431 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11432 left += offset; 11433 } else { 11434 right += offset; 11435 } 11436 break; 11437 case SCROLLBAR_POSITION_RIGHT: 11438 right += offset; 11439 break; 11440 case SCROLLBAR_POSITION_LEFT: 11441 left += offset; 11442 break; 11443 } 11444 } 11445 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 11446 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 11447 ? 0 : getHorizontalScrollbarHeight(); 11448 } 11449 } 11450 11451 if (mPaddingLeft != left) { 11452 changed = true; 11453 mPaddingLeft = left; 11454 } 11455 if (mPaddingTop != top) { 11456 changed = true; 11457 mPaddingTop = top; 11458 } 11459 if (mPaddingRight != right) { 11460 changed = true; 11461 mPaddingRight = right; 11462 } 11463 if (mPaddingBottom != bottom) { 11464 changed = true; 11465 mPaddingBottom = bottom; 11466 } 11467 11468 if (changed) { 11469 requestLayout(); 11470 } 11471 } 11472 11473 /** 11474 * Sets the relative padding. The view may add on the space required to display 11475 * the scrollbars, depending on the style and visibility of the scrollbars. 11476 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 11477 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 11478 * from the values set in this call. 11479 * 11480 * @attr ref android.R.styleable#View_padding 11481 * @attr ref android.R.styleable#View_paddingBottom 11482 * @attr ref android.R.styleable#View_paddingStart 11483 * @attr ref android.R.styleable#View_paddingEnd 11484 * @attr ref android.R.styleable#View_paddingTop 11485 * @param start the start padding in pixels 11486 * @param top the top padding in pixels 11487 * @param end the end padding in pixels 11488 * @param bottom the bottom padding in pixels 11489 * 11490 * @hide 11491 */ 11492 public void setPaddingRelative(int start, int top, int end, int bottom) { 11493 mUserPaddingRelative = true; 11494 11495 mUserPaddingStart = start; 11496 mUserPaddingEnd = end; 11497 11498 switch(getResolvedLayoutDirection()) { 11499 case LAYOUT_DIRECTION_RTL: 11500 setPadding(end, top, start, bottom); 11501 break; 11502 case LAYOUT_DIRECTION_LTR: 11503 default: 11504 setPadding(start, top, end, bottom); 11505 } 11506 } 11507 11508 /** 11509 * Returns the top padding of this view. 11510 * 11511 * @return the top padding in pixels 11512 */ 11513 public int getPaddingTop() { 11514 return mPaddingTop; 11515 } 11516 11517 /** 11518 * Returns the bottom padding of this view. If there are inset and enabled 11519 * scrollbars, this value may include the space required to display the 11520 * scrollbars as well. 11521 * 11522 * @return the bottom padding in pixels 11523 */ 11524 public int getPaddingBottom() { 11525 return mPaddingBottom; 11526 } 11527 11528 /** 11529 * Returns the left padding of this view. If there are inset and enabled 11530 * scrollbars, this value may include the space required to display the 11531 * scrollbars as well. 11532 * 11533 * @return the left padding in pixels 11534 */ 11535 public int getPaddingLeft() { 11536 return mPaddingLeft; 11537 } 11538 11539 /** 11540 * Returns the start padding of this view. If there are inset and enabled 11541 * scrollbars, this value may include the space required to display the 11542 * scrollbars as well. 11543 * 11544 * @return the start padding in pixels 11545 * 11546 * @hide 11547 */ 11548 public int getPaddingStart() { 11549 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11550 mPaddingRight : mPaddingLeft; 11551 } 11552 11553 /** 11554 * Returns the right padding of this view. If there are inset and enabled 11555 * scrollbars, this value may include the space required to display the 11556 * scrollbars as well. 11557 * 11558 * @return the right padding in pixels 11559 */ 11560 public int getPaddingRight() { 11561 return mPaddingRight; 11562 } 11563 11564 /** 11565 * Returns the end padding of this view. If there are inset and enabled 11566 * scrollbars, this value may include the space required to display the 11567 * scrollbars as well. 11568 * 11569 * @return the end padding in pixels 11570 * 11571 * @hide 11572 */ 11573 public int getPaddingEnd() { 11574 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11575 mPaddingLeft : mPaddingRight; 11576 } 11577 11578 /** 11579 * Return if the padding as been set thru relative values 11580 * {@link #setPaddingRelative(int, int, int, int)} or thru 11581 * @attr ref android.R.styleable#View_paddingStart or 11582 * @attr ref android.R.styleable#View_paddingEnd 11583 * 11584 * @return true if the padding is relative or false if it is not. 11585 * 11586 * @hide 11587 */ 11588 public boolean isPaddingRelative() { 11589 return mUserPaddingRelative; 11590 } 11591 11592 /** 11593 * Changes the selection state of this view. A view can be selected or not. 11594 * Note that selection is not the same as focus. Views are typically 11595 * selected in the context of an AdapterView like ListView or GridView; 11596 * the selected view is the view that is highlighted. 11597 * 11598 * @param selected true if the view must be selected, false otherwise 11599 */ 11600 public void setSelected(boolean selected) { 11601 if (((mPrivateFlags & SELECTED) != 0) != selected) { 11602 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 11603 if (!selected) resetPressedState(); 11604 invalidate(true); 11605 refreshDrawableState(); 11606 dispatchSetSelected(selected); 11607 } 11608 } 11609 11610 /** 11611 * Dispatch setSelected to all of this View's children. 11612 * 11613 * @see #setSelected(boolean) 11614 * 11615 * @param selected The new selected state 11616 */ 11617 protected void dispatchSetSelected(boolean selected) { 11618 } 11619 11620 /** 11621 * Indicates the selection state of this view. 11622 * 11623 * @return true if the view is selected, false otherwise 11624 */ 11625 @ViewDebug.ExportedProperty 11626 public boolean isSelected() { 11627 return (mPrivateFlags & SELECTED) != 0; 11628 } 11629 11630 /** 11631 * Changes the activated state of this view. A view can be activated or not. 11632 * Note that activation is not the same as selection. Selection is 11633 * a transient property, representing the view (hierarchy) the user is 11634 * currently interacting with. Activation is a longer-term state that the 11635 * user can move views in and out of. For example, in a list view with 11636 * single or multiple selection enabled, the views in the current selection 11637 * set are activated. (Um, yeah, we are deeply sorry about the terminology 11638 * here.) The activated state is propagated down to children of the view it 11639 * is set on. 11640 * 11641 * @param activated true if the view must be activated, false otherwise 11642 */ 11643 public void setActivated(boolean activated) { 11644 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 11645 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 11646 invalidate(true); 11647 refreshDrawableState(); 11648 dispatchSetActivated(activated); 11649 } 11650 } 11651 11652 /** 11653 * Dispatch setActivated to all of this View's children. 11654 * 11655 * @see #setActivated(boolean) 11656 * 11657 * @param activated The new activated state 11658 */ 11659 protected void dispatchSetActivated(boolean activated) { 11660 } 11661 11662 /** 11663 * Indicates the activation state of this view. 11664 * 11665 * @return true if the view is activated, false otherwise 11666 */ 11667 @ViewDebug.ExportedProperty 11668 public boolean isActivated() { 11669 return (mPrivateFlags & ACTIVATED) != 0; 11670 } 11671 11672 /** 11673 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 11674 * observer can be used to get notifications when global events, like 11675 * layout, happen. 11676 * 11677 * The returned ViewTreeObserver observer is not guaranteed to remain 11678 * valid for the lifetime of this View. If the caller of this method keeps 11679 * a long-lived reference to ViewTreeObserver, it should always check for 11680 * the return value of {@link ViewTreeObserver#isAlive()}. 11681 * 11682 * @return The ViewTreeObserver for this view's hierarchy. 11683 */ 11684 public ViewTreeObserver getViewTreeObserver() { 11685 if (mAttachInfo != null) { 11686 return mAttachInfo.mTreeObserver; 11687 } 11688 if (mFloatingTreeObserver == null) { 11689 mFloatingTreeObserver = new ViewTreeObserver(); 11690 } 11691 return mFloatingTreeObserver; 11692 } 11693 11694 /** 11695 * <p>Finds the topmost view in the current view hierarchy.</p> 11696 * 11697 * @return the topmost view containing this view 11698 */ 11699 public View getRootView() { 11700 if (mAttachInfo != null) { 11701 final View v = mAttachInfo.mRootView; 11702 if (v != null) { 11703 return v; 11704 } 11705 } 11706 11707 View parent = this; 11708 11709 while (parent.mParent != null && parent.mParent instanceof View) { 11710 parent = (View) parent.mParent; 11711 } 11712 11713 return parent; 11714 } 11715 11716 /** 11717 * <p>Computes the coordinates of this view on the screen. The argument 11718 * must be an array of two integers. After the method returns, the array 11719 * contains the x and y location in that order.</p> 11720 * 11721 * @param location an array of two integers in which to hold the coordinates 11722 */ 11723 public void getLocationOnScreen(int[] location) { 11724 getLocationInWindow(location); 11725 11726 final AttachInfo info = mAttachInfo; 11727 if (info != null) { 11728 location[0] += info.mWindowLeft; 11729 location[1] += info.mWindowTop; 11730 } 11731 } 11732 11733 /** 11734 * <p>Computes the coordinates of this view in its window. The argument 11735 * must be an array of two integers. After the method returns, the array 11736 * contains the x and y location in that order.</p> 11737 * 11738 * @param location an array of two integers in which to hold the coordinates 11739 */ 11740 public void getLocationInWindow(int[] location) { 11741 if (location == null || location.length < 2) { 11742 throw new IllegalArgumentException("location must be an array of " 11743 + "two integers"); 11744 } 11745 11746 location[0] = mLeft + (int) (mTranslationX + 0.5f); 11747 location[1] = mTop + (int) (mTranslationY + 0.5f); 11748 11749 ViewParent viewParent = mParent; 11750 while (viewParent instanceof View) { 11751 final View view = (View)viewParent; 11752 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 11753 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 11754 viewParent = view.mParent; 11755 } 11756 11757 if (viewParent instanceof ViewRootImpl) { 11758 // *cough* 11759 final ViewRootImpl vr = (ViewRootImpl)viewParent; 11760 location[1] -= vr.mCurScrollY; 11761 } 11762 } 11763 11764 /** 11765 * {@hide} 11766 * @param id the id of the view to be found 11767 * @return the view of the specified id, null if cannot be found 11768 */ 11769 protected View findViewTraversal(int id) { 11770 if (id == mID) { 11771 return this; 11772 } 11773 return null; 11774 } 11775 11776 /** 11777 * {@hide} 11778 * @param tag the tag of the view to be found 11779 * @return the view of specified tag, null if cannot be found 11780 */ 11781 protected View findViewWithTagTraversal(Object tag) { 11782 if (tag != null && tag.equals(mTag)) { 11783 return this; 11784 } 11785 return null; 11786 } 11787 11788 /** 11789 * {@hide} 11790 * @param predicate The predicate to evaluate. 11791 * @param childToSkip If not null, ignores this child during the recursive traversal. 11792 * @return The first view that matches the predicate or null. 11793 */ 11794 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 11795 if (predicate.apply(this)) { 11796 return this; 11797 } 11798 return null; 11799 } 11800 11801 /** 11802 * Look for a child view with the given id. If this view has the given 11803 * id, return this view. 11804 * 11805 * @param id The id to search for. 11806 * @return The view that has the given id in the hierarchy or null 11807 */ 11808 public final View findViewById(int id) { 11809 if (id < 0) { 11810 return null; 11811 } 11812 return findViewTraversal(id); 11813 } 11814 11815 /** 11816 * Look for a child view with the given tag. If this view has the given 11817 * tag, return this view. 11818 * 11819 * @param tag The tag to search for, using "tag.equals(getTag())". 11820 * @return The View that has the given tag in the hierarchy or null 11821 */ 11822 public final View findViewWithTag(Object tag) { 11823 if (tag == null) { 11824 return null; 11825 } 11826 return findViewWithTagTraversal(tag); 11827 } 11828 11829 /** 11830 * {@hide} 11831 * Look for a child view that matches the specified predicate. 11832 * If this view matches the predicate, return this view. 11833 * 11834 * @param predicate The predicate to evaluate. 11835 * @return The first view that matches the predicate or null. 11836 */ 11837 public final View findViewByPredicate(Predicate<View> predicate) { 11838 return findViewByPredicateTraversal(predicate, null); 11839 } 11840 11841 /** 11842 * {@hide} 11843 * Look for a child view that matches the specified predicate, 11844 * starting with the specified view and its descendents and then 11845 * recusively searching the ancestors and siblings of that view 11846 * until this view is reached. 11847 * 11848 * This method is useful in cases where the predicate does not match 11849 * a single unique view (perhaps multiple views use the same id) 11850 * and we are trying to find the view that is "closest" in scope to the 11851 * starting view. 11852 * 11853 * @param start The view to start from. 11854 * @param predicate The predicate to evaluate. 11855 * @return The first view that matches the predicate or null. 11856 */ 11857 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 11858 View childToSkip = null; 11859 for (;;) { 11860 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 11861 if (view != null || start == this) { 11862 return view; 11863 } 11864 11865 ViewParent parent = start.getParent(); 11866 if (parent == null || !(parent instanceof View)) { 11867 return null; 11868 } 11869 11870 childToSkip = start; 11871 start = (View) parent; 11872 } 11873 } 11874 11875 /** 11876 * Sets the identifier for this view. The identifier does not have to be 11877 * unique in this view's hierarchy. The identifier should be a positive 11878 * number. 11879 * 11880 * @see #NO_ID 11881 * @see #getId() 11882 * @see #findViewById(int) 11883 * 11884 * @param id a number used to identify the view 11885 * 11886 * @attr ref android.R.styleable#View_id 11887 */ 11888 public void setId(int id) { 11889 mID = id; 11890 } 11891 11892 /** 11893 * {@hide} 11894 * 11895 * @param isRoot true if the view belongs to the root namespace, false 11896 * otherwise 11897 */ 11898 public void setIsRootNamespace(boolean isRoot) { 11899 if (isRoot) { 11900 mPrivateFlags |= IS_ROOT_NAMESPACE; 11901 } else { 11902 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 11903 } 11904 } 11905 11906 /** 11907 * {@hide} 11908 * 11909 * @return true if the view belongs to the root namespace, false otherwise 11910 */ 11911 public boolean isRootNamespace() { 11912 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 11913 } 11914 11915 /** 11916 * Returns this view's identifier. 11917 * 11918 * @return a positive integer used to identify the view or {@link #NO_ID} 11919 * if the view has no ID 11920 * 11921 * @see #setId(int) 11922 * @see #findViewById(int) 11923 * @attr ref android.R.styleable#View_id 11924 */ 11925 @ViewDebug.CapturedViewProperty 11926 public int getId() { 11927 return mID; 11928 } 11929 11930 /** 11931 * Returns this view's tag. 11932 * 11933 * @return the Object stored in this view as a tag 11934 * 11935 * @see #setTag(Object) 11936 * @see #getTag(int) 11937 */ 11938 @ViewDebug.ExportedProperty 11939 public Object getTag() { 11940 return mTag; 11941 } 11942 11943 /** 11944 * Sets the tag associated with this view. A tag can be used to mark 11945 * a view in its hierarchy and does not have to be unique within the 11946 * hierarchy. Tags can also be used to store data within a view without 11947 * resorting to another data structure. 11948 * 11949 * @param tag an Object to tag the view with 11950 * 11951 * @see #getTag() 11952 * @see #setTag(int, Object) 11953 */ 11954 public void setTag(final Object tag) { 11955 mTag = tag; 11956 } 11957 11958 /** 11959 * Returns the tag associated with this view and the specified key. 11960 * 11961 * @param key The key identifying the tag 11962 * 11963 * @return the Object stored in this view as a tag 11964 * 11965 * @see #setTag(int, Object) 11966 * @see #getTag() 11967 */ 11968 public Object getTag(int key) { 11969 SparseArray<Object> tags = null; 11970 synchronized (sTagsLock) { 11971 if (sTags != null) { 11972 tags = sTags.get(this); 11973 } 11974 } 11975 11976 if (tags != null) return tags.get(key); 11977 return null; 11978 } 11979 11980 /** 11981 * Sets a tag associated with this view and a key. A tag can be used 11982 * to mark a view in its hierarchy and does not have to be unique within 11983 * the hierarchy. Tags can also be used to store data within a view 11984 * without resorting to another data structure. 11985 * 11986 * The specified key should be an id declared in the resources of the 11987 * application to ensure it is unique (see the <a 11988 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 11989 * Keys identified as belonging to 11990 * the Android framework or not associated with any package will cause 11991 * an {@link IllegalArgumentException} to be thrown. 11992 * 11993 * @param key The key identifying the tag 11994 * @param tag An Object to tag the view with 11995 * 11996 * @throws IllegalArgumentException If they specified key is not valid 11997 * 11998 * @see #setTag(Object) 11999 * @see #getTag(int) 12000 */ 12001 public void setTag(int key, final Object tag) { 12002 // If the package id is 0x00 or 0x01, it's either an undefined package 12003 // or a framework id 12004 if ((key >>> 24) < 2) { 12005 throw new IllegalArgumentException("The key must be an application-specific " 12006 + "resource id."); 12007 } 12008 12009 setTagInternal(this, key, tag); 12010 } 12011 12012 /** 12013 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 12014 * framework id. 12015 * 12016 * @hide 12017 */ 12018 public void setTagInternal(int key, Object tag) { 12019 if ((key >>> 24) != 0x1) { 12020 throw new IllegalArgumentException("The key must be a framework-specific " 12021 + "resource id."); 12022 } 12023 12024 setTagInternal(this, key, tag); 12025 } 12026 12027 private static void setTagInternal(View view, int key, Object tag) { 12028 SparseArray<Object> tags = null; 12029 synchronized (sTagsLock) { 12030 if (sTags == null) { 12031 sTags = new WeakHashMap<View, SparseArray<Object>>(); 12032 } else { 12033 tags = sTags.get(view); 12034 } 12035 } 12036 12037 if (tags == null) { 12038 tags = new SparseArray<Object>(2); 12039 synchronized (sTagsLock) { 12040 sTags.put(view, tags); 12041 } 12042 } 12043 12044 tags.put(key, tag); 12045 } 12046 12047 /** 12048 * @param consistency The type of consistency. See ViewDebug for more information. 12049 * 12050 * @hide 12051 */ 12052 protected boolean dispatchConsistencyCheck(int consistency) { 12053 return onConsistencyCheck(consistency); 12054 } 12055 12056 /** 12057 * Method that subclasses should implement to check their consistency. The type of 12058 * consistency check is indicated by the bit field passed as a parameter. 12059 * 12060 * @param consistency The type of consistency. See ViewDebug for more information. 12061 * 12062 * @throws IllegalStateException if the view is in an inconsistent state. 12063 * 12064 * @hide 12065 */ 12066 protected boolean onConsistencyCheck(int consistency) { 12067 boolean result = true; 12068 12069 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 12070 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 12071 12072 if (checkLayout) { 12073 if (getParent() == null) { 12074 result = false; 12075 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12076 "View " + this + " does not have a parent."); 12077 } 12078 12079 if (mAttachInfo == null) { 12080 result = false; 12081 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12082 "View " + this + " is not attached to a window."); 12083 } 12084 } 12085 12086 if (checkDrawing) { 12087 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 12088 // from their draw() method 12089 12090 if ((mPrivateFlags & DRAWN) != DRAWN && 12091 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 12092 result = false; 12093 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12094 "View " + this + " was invalidated but its drawing cache is valid."); 12095 } 12096 } 12097 12098 return result; 12099 } 12100 12101 /** 12102 * Prints information about this view in the log output, with the tag 12103 * {@link #VIEW_LOG_TAG}. 12104 * 12105 * @hide 12106 */ 12107 public void debug() { 12108 debug(0); 12109 } 12110 12111 /** 12112 * Prints information about this view in the log output, with the tag 12113 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 12114 * indentation defined by the <code>depth</code>. 12115 * 12116 * @param depth the indentation level 12117 * 12118 * @hide 12119 */ 12120 protected void debug(int depth) { 12121 String output = debugIndent(depth - 1); 12122 12123 output += "+ " + this; 12124 int id = getId(); 12125 if (id != -1) { 12126 output += " (id=" + id + ")"; 12127 } 12128 Object tag = getTag(); 12129 if (tag != null) { 12130 output += " (tag=" + tag + ")"; 12131 } 12132 Log.d(VIEW_LOG_TAG, output); 12133 12134 if ((mPrivateFlags & FOCUSED) != 0) { 12135 output = debugIndent(depth) + " FOCUSED"; 12136 Log.d(VIEW_LOG_TAG, output); 12137 } 12138 12139 output = debugIndent(depth); 12140 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 12141 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 12142 + "} "; 12143 Log.d(VIEW_LOG_TAG, output); 12144 12145 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 12146 || mPaddingBottom != 0) { 12147 output = debugIndent(depth); 12148 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 12149 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 12150 Log.d(VIEW_LOG_TAG, output); 12151 } 12152 12153 output = debugIndent(depth); 12154 output += "mMeasureWidth=" + mMeasuredWidth + 12155 " mMeasureHeight=" + mMeasuredHeight; 12156 Log.d(VIEW_LOG_TAG, output); 12157 12158 output = debugIndent(depth); 12159 if (mLayoutParams == null) { 12160 output += "BAD! no layout params"; 12161 } else { 12162 output = mLayoutParams.debug(output); 12163 } 12164 Log.d(VIEW_LOG_TAG, output); 12165 12166 output = debugIndent(depth); 12167 output += "flags={"; 12168 output += View.printFlags(mViewFlags); 12169 output += "}"; 12170 Log.d(VIEW_LOG_TAG, output); 12171 12172 output = debugIndent(depth); 12173 output += "privateFlags={"; 12174 output += View.printPrivateFlags(mPrivateFlags); 12175 output += "}"; 12176 Log.d(VIEW_LOG_TAG, output); 12177 } 12178 12179 /** 12180 * Creates an string of whitespaces used for indentation. 12181 * 12182 * @param depth the indentation level 12183 * @return a String containing (depth * 2 + 3) * 2 white spaces 12184 * 12185 * @hide 12186 */ 12187 protected static String debugIndent(int depth) { 12188 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 12189 for (int i = 0; i < (depth * 2) + 3; i++) { 12190 spaces.append(' ').append(' '); 12191 } 12192 return spaces.toString(); 12193 } 12194 12195 /** 12196 * <p>Return the offset of the widget's text baseline from the widget's top 12197 * boundary. If this widget does not support baseline alignment, this 12198 * method returns -1. </p> 12199 * 12200 * @return the offset of the baseline within the widget's bounds or -1 12201 * if baseline alignment is not supported 12202 */ 12203 @ViewDebug.ExportedProperty(category = "layout") 12204 public int getBaseline() { 12205 return -1; 12206 } 12207 12208 /** 12209 * Call this when something has changed which has invalidated the 12210 * layout of this view. This will schedule a layout pass of the view 12211 * tree. 12212 */ 12213 public void requestLayout() { 12214 if (ViewDebug.TRACE_HIERARCHY) { 12215 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 12216 } 12217 12218 mPrivateFlags |= FORCE_LAYOUT; 12219 mPrivateFlags |= INVALIDATED; 12220 12221 if (mParent != null) { 12222 if (mLayoutParams != null) { 12223 mLayoutParams.resolveWithDirection(getResolvedLayoutDirection()); 12224 } 12225 if (!mParent.isLayoutRequested()) { 12226 mParent.requestLayout(); 12227 } 12228 } 12229 } 12230 12231 /** 12232 * Forces this view to be laid out during the next layout pass. 12233 * This method does not call requestLayout() or forceLayout() 12234 * on the parent. 12235 */ 12236 public void forceLayout() { 12237 mPrivateFlags |= FORCE_LAYOUT; 12238 mPrivateFlags |= INVALIDATED; 12239 } 12240 12241 /** 12242 * <p> 12243 * This is called to find out how big a view should be. The parent 12244 * supplies constraint information in the width and height parameters. 12245 * </p> 12246 * 12247 * <p> 12248 * The actual mesurement work of a view is performed in 12249 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 12250 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 12251 * </p> 12252 * 12253 * 12254 * @param widthMeasureSpec Horizontal space requirements as imposed by the 12255 * parent 12256 * @param heightMeasureSpec Vertical space requirements as imposed by the 12257 * parent 12258 * 12259 * @see #onMeasure(int, int) 12260 */ 12261 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 12262 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 12263 widthMeasureSpec != mOldWidthMeasureSpec || 12264 heightMeasureSpec != mOldHeightMeasureSpec) { 12265 12266 // first clears the measured dimension flag 12267 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 12268 12269 if (ViewDebug.TRACE_HIERARCHY) { 12270 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 12271 } 12272 12273 // measure ourselves, this should set the measured dimension flag back 12274 onMeasure(widthMeasureSpec, heightMeasureSpec); 12275 12276 // flag not set, setMeasuredDimension() was not invoked, we raise 12277 // an exception to warn the developer 12278 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 12279 throw new IllegalStateException("onMeasure() did not set the" 12280 + " measured dimension by calling" 12281 + " setMeasuredDimension()"); 12282 } 12283 12284 mPrivateFlags |= LAYOUT_REQUIRED; 12285 } 12286 12287 mOldWidthMeasureSpec = widthMeasureSpec; 12288 mOldHeightMeasureSpec = heightMeasureSpec; 12289 } 12290 12291 /** 12292 * <p> 12293 * Measure the view and its content to determine the measured width and the 12294 * measured height. This method is invoked by {@link #measure(int, int)} and 12295 * should be overriden by subclasses to provide accurate and efficient 12296 * measurement of their contents. 12297 * </p> 12298 * 12299 * <p> 12300 * <strong>CONTRACT:</strong> When overriding this method, you 12301 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 12302 * measured width and height of this view. Failure to do so will trigger an 12303 * <code>IllegalStateException</code>, thrown by 12304 * {@link #measure(int, int)}. Calling the superclass' 12305 * {@link #onMeasure(int, int)} is a valid use. 12306 * </p> 12307 * 12308 * <p> 12309 * The base class implementation of measure defaults to the background size, 12310 * unless a larger size is allowed by the MeasureSpec. Subclasses should 12311 * override {@link #onMeasure(int, int)} to provide better measurements of 12312 * their content. 12313 * </p> 12314 * 12315 * <p> 12316 * If this method is overridden, it is the subclass's responsibility to make 12317 * sure the measured height and width are at least the view's minimum height 12318 * and width ({@link #getSuggestedMinimumHeight()} and 12319 * {@link #getSuggestedMinimumWidth()}). 12320 * </p> 12321 * 12322 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 12323 * The requirements are encoded with 12324 * {@link android.view.View.MeasureSpec}. 12325 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 12326 * The requirements are encoded with 12327 * {@link android.view.View.MeasureSpec}. 12328 * 12329 * @see #getMeasuredWidth() 12330 * @see #getMeasuredHeight() 12331 * @see #setMeasuredDimension(int, int) 12332 * @see #getSuggestedMinimumHeight() 12333 * @see #getSuggestedMinimumWidth() 12334 * @see android.view.View.MeasureSpec#getMode(int) 12335 * @see android.view.View.MeasureSpec#getSize(int) 12336 */ 12337 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 12338 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 12339 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 12340 } 12341 12342 /** 12343 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 12344 * measured width and measured height. Failing to do so will trigger an 12345 * exception at measurement time.</p> 12346 * 12347 * @param measuredWidth The measured width of this view. May be a complex 12348 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12349 * {@link #MEASURED_STATE_TOO_SMALL}. 12350 * @param measuredHeight The measured height of this view. May be a complex 12351 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12352 * {@link #MEASURED_STATE_TOO_SMALL}. 12353 */ 12354 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 12355 mMeasuredWidth = measuredWidth; 12356 mMeasuredHeight = measuredHeight; 12357 12358 mPrivateFlags |= MEASURED_DIMENSION_SET; 12359 } 12360 12361 /** 12362 * Merge two states as returned by {@link #getMeasuredState()}. 12363 * @param curState The current state as returned from a view or the result 12364 * of combining multiple views. 12365 * @param newState The new view state to combine. 12366 * @return Returns a new integer reflecting the combination of the two 12367 * states. 12368 */ 12369 public static int combineMeasuredStates(int curState, int newState) { 12370 return curState | newState; 12371 } 12372 12373 /** 12374 * Version of {@link #resolveSizeAndState(int, int, int)} 12375 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 12376 */ 12377 public static int resolveSize(int size, int measureSpec) { 12378 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 12379 } 12380 12381 /** 12382 * Utility to reconcile a desired size and state, with constraints imposed 12383 * by a MeasureSpec. Will take the desired size, unless a different size 12384 * is imposed by the constraints. The returned value is a compound integer, 12385 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 12386 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 12387 * size is smaller than the size the view wants to be. 12388 * 12389 * @param size How big the view wants to be 12390 * @param measureSpec Constraints imposed by the parent 12391 * @return Size information bit mask as defined by 12392 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 12393 */ 12394 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 12395 int result = size; 12396 int specMode = MeasureSpec.getMode(measureSpec); 12397 int specSize = MeasureSpec.getSize(measureSpec); 12398 switch (specMode) { 12399 case MeasureSpec.UNSPECIFIED: 12400 result = size; 12401 break; 12402 case MeasureSpec.AT_MOST: 12403 if (specSize < size) { 12404 result = specSize | MEASURED_STATE_TOO_SMALL; 12405 } else { 12406 result = size; 12407 } 12408 break; 12409 case MeasureSpec.EXACTLY: 12410 result = specSize; 12411 break; 12412 } 12413 return result | (childMeasuredState&MEASURED_STATE_MASK); 12414 } 12415 12416 /** 12417 * Utility to return a default size. Uses the supplied size if the 12418 * MeasureSpec imposed no constraints. Will get larger if allowed 12419 * by the MeasureSpec. 12420 * 12421 * @param size Default size for this view 12422 * @param measureSpec Constraints imposed by the parent 12423 * @return The size this view should be. 12424 */ 12425 public static int getDefaultSize(int size, int measureSpec) { 12426 int result = size; 12427 int specMode = MeasureSpec.getMode(measureSpec); 12428 int specSize = MeasureSpec.getSize(measureSpec); 12429 12430 switch (specMode) { 12431 case MeasureSpec.UNSPECIFIED: 12432 result = size; 12433 break; 12434 case MeasureSpec.AT_MOST: 12435 case MeasureSpec.EXACTLY: 12436 result = specSize; 12437 break; 12438 } 12439 return result; 12440 } 12441 12442 /** 12443 * Returns the suggested minimum height that the view should use. This 12444 * returns the maximum of the view's minimum height 12445 * and the background's minimum height 12446 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 12447 * <p> 12448 * When being used in {@link #onMeasure(int, int)}, the caller should still 12449 * ensure the returned height is within the requirements of the parent. 12450 * 12451 * @return The suggested minimum height of the view. 12452 */ 12453 protected int getSuggestedMinimumHeight() { 12454 int suggestedMinHeight = mMinHeight; 12455 12456 if (mBGDrawable != null) { 12457 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 12458 if (suggestedMinHeight < bgMinHeight) { 12459 suggestedMinHeight = bgMinHeight; 12460 } 12461 } 12462 12463 return suggestedMinHeight; 12464 } 12465 12466 /** 12467 * Returns the suggested minimum width that the view should use. This 12468 * returns the maximum of the view's minimum width) 12469 * and the background's minimum width 12470 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 12471 * <p> 12472 * When being used in {@link #onMeasure(int, int)}, the caller should still 12473 * ensure the returned width is within the requirements of the parent. 12474 * 12475 * @return The suggested minimum width of the view. 12476 */ 12477 protected int getSuggestedMinimumWidth() { 12478 int suggestedMinWidth = mMinWidth; 12479 12480 if (mBGDrawable != null) { 12481 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 12482 if (suggestedMinWidth < bgMinWidth) { 12483 suggestedMinWidth = bgMinWidth; 12484 } 12485 } 12486 12487 return suggestedMinWidth; 12488 } 12489 12490 /** 12491 * Sets the minimum height of the view. It is not guaranteed the view will 12492 * be able to achieve this minimum height (for example, if its parent layout 12493 * constrains it with less available height). 12494 * 12495 * @param minHeight The minimum height the view will try to be. 12496 */ 12497 public void setMinimumHeight(int minHeight) { 12498 mMinHeight = minHeight; 12499 } 12500 12501 /** 12502 * Sets the minimum width of the view. It is not guaranteed the view will 12503 * be able to achieve this minimum width (for example, if its parent layout 12504 * constrains it with less available width). 12505 * 12506 * @param minWidth The minimum width the view will try to be. 12507 */ 12508 public void setMinimumWidth(int minWidth) { 12509 mMinWidth = minWidth; 12510 } 12511 12512 /** 12513 * Get the animation currently associated with this view. 12514 * 12515 * @return The animation that is currently playing or 12516 * scheduled to play for this view. 12517 */ 12518 public Animation getAnimation() { 12519 return mCurrentAnimation; 12520 } 12521 12522 /** 12523 * Start the specified animation now. 12524 * 12525 * @param animation the animation to start now 12526 */ 12527 public void startAnimation(Animation animation) { 12528 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 12529 setAnimation(animation); 12530 invalidateParentCaches(); 12531 invalidate(true); 12532 } 12533 12534 /** 12535 * Cancels any animations for this view. 12536 */ 12537 public void clearAnimation() { 12538 if (mCurrentAnimation != null) { 12539 mCurrentAnimation.detach(); 12540 } 12541 mCurrentAnimation = null; 12542 invalidateParentIfNeeded(); 12543 } 12544 12545 /** 12546 * Sets the next animation to play for this view. 12547 * If you want the animation to play immediately, use 12548 * startAnimation. This method provides allows fine-grained 12549 * control over the start time and invalidation, but you 12550 * must make sure that 1) the animation has a start time set, and 12551 * 2) the view will be invalidated when the animation is supposed to 12552 * start. 12553 * 12554 * @param animation The next animation, or null. 12555 */ 12556 public void setAnimation(Animation animation) { 12557 mCurrentAnimation = animation; 12558 if (animation != null) { 12559 animation.reset(); 12560 } 12561 } 12562 12563 /** 12564 * Invoked by a parent ViewGroup to notify the start of the animation 12565 * currently associated with this view. If you override this method, 12566 * always call super.onAnimationStart(); 12567 * 12568 * @see #setAnimation(android.view.animation.Animation) 12569 * @see #getAnimation() 12570 */ 12571 protected void onAnimationStart() { 12572 mPrivateFlags |= ANIMATION_STARTED; 12573 } 12574 12575 /** 12576 * Invoked by a parent ViewGroup to notify the end of the animation 12577 * currently associated with this view. If you override this method, 12578 * always call super.onAnimationEnd(); 12579 * 12580 * @see #setAnimation(android.view.animation.Animation) 12581 * @see #getAnimation() 12582 */ 12583 protected void onAnimationEnd() { 12584 mPrivateFlags &= ~ANIMATION_STARTED; 12585 } 12586 12587 /** 12588 * Invoked if there is a Transform that involves alpha. Subclass that can 12589 * draw themselves with the specified alpha should return true, and then 12590 * respect that alpha when their onDraw() is called. If this returns false 12591 * then the view may be redirected to draw into an offscreen buffer to 12592 * fulfill the request, which will look fine, but may be slower than if the 12593 * subclass handles it internally. The default implementation returns false. 12594 * 12595 * @param alpha The alpha (0..255) to apply to the view's drawing 12596 * @return true if the view can draw with the specified alpha. 12597 */ 12598 protected boolean onSetAlpha(int alpha) { 12599 return false; 12600 } 12601 12602 /** 12603 * This is used by the RootView to perform an optimization when 12604 * the view hierarchy contains one or several SurfaceView. 12605 * SurfaceView is always considered transparent, but its children are not, 12606 * therefore all View objects remove themselves from the global transparent 12607 * region (passed as a parameter to this function). 12608 * 12609 * @param region The transparent region for this ViewAncestor (window). 12610 * 12611 * @return Returns true if the effective visibility of the view at this 12612 * point is opaque, regardless of the transparent region; returns false 12613 * if it is possible for underlying windows to be seen behind the view. 12614 * 12615 * {@hide} 12616 */ 12617 public boolean gatherTransparentRegion(Region region) { 12618 final AttachInfo attachInfo = mAttachInfo; 12619 if (region != null && attachInfo != null) { 12620 final int pflags = mPrivateFlags; 12621 if ((pflags & SKIP_DRAW) == 0) { 12622 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 12623 // remove it from the transparent region. 12624 final int[] location = attachInfo.mTransparentLocation; 12625 getLocationInWindow(location); 12626 region.op(location[0], location[1], location[0] + mRight - mLeft, 12627 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 12628 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 12629 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 12630 // exists, so we remove the background drawable's non-transparent 12631 // parts from this transparent region. 12632 applyDrawableToTransparentRegion(mBGDrawable, region); 12633 } 12634 } 12635 return true; 12636 } 12637 12638 /** 12639 * Play a sound effect for this view. 12640 * 12641 * <p>The framework will play sound effects for some built in actions, such as 12642 * clicking, but you may wish to play these effects in your widget, 12643 * for instance, for internal navigation. 12644 * 12645 * <p>The sound effect will only be played if sound effects are enabled by the user, and 12646 * {@link #isSoundEffectsEnabled()} is true. 12647 * 12648 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 12649 */ 12650 public void playSoundEffect(int soundConstant) { 12651 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 12652 return; 12653 } 12654 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 12655 } 12656 12657 /** 12658 * BZZZTT!!1! 12659 * 12660 * <p>Provide haptic feedback to the user for this view. 12661 * 12662 * <p>The framework will provide haptic feedback for some built in actions, 12663 * such as long presses, but you may wish to provide feedback for your 12664 * own widget. 12665 * 12666 * <p>The feedback will only be performed if 12667 * {@link #isHapticFeedbackEnabled()} is true. 12668 * 12669 * @param feedbackConstant One of the constants defined in 12670 * {@link HapticFeedbackConstants} 12671 */ 12672 public boolean performHapticFeedback(int feedbackConstant) { 12673 return performHapticFeedback(feedbackConstant, 0); 12674 } 12675 12676 /** 12677 * BZZZTT!!1! 12678 * 12679 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 12680 * 12681 * @param feedbackConstant One of the constants defined in 12682 * {@link HapticFeedbackConstants} 12683 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 12684 */ 12685 public boolean performHapticFeedback(int feedbackConstant, int flags) { 12686 if (mAttachInfo == null) { 12687 return false; 12688 } 12689 //noinspection SimplifiableIfStatement 12690 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 12691 && !isHapticFeedbackEnabled()) { 12692 return false; 12693 } 12694 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 12695 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 12696 } 12697 12698 /** 12699 * Request that the visibility of the status bar be changed. 12700 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 12701 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 12702 * 12703 * This value will be re-applied immediately, even if the flags have not changed, so a view may 12704 * easily reassert a particular SystemUiVisibility condition even if the system UI itself has 12705 * since countermanded the original request. 12706 */ 12707 public void setSystemUiVisibility(int visibility) { 12708 mSystemUiVisibility = visibility; 12709 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12710 mParent.recomputeViewAttributes(this); 12711 } 12712 } 12713 12714 /** 12715 * Returns the status bar visibility that this view has requested. 12716 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 12717 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 12718 */ 12719 public int getSystemUiVisibility() { 12720 return mSystemUiVisibility; 12721 } 12722 12723 /** 12724 * Set a listener to receive callbacks when the visibility of the system bar changes. 12725 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 12726 */ 12727 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 12728 mOnSystemUiVisibilityChangeListener = l; 12729 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12730 mParent.recomputeViewAttributes(this); 12731 } 12732 } 12733 12734 /** 12735 */ 12736 public void dispatchSystemUiVisibilityChanged(int visibility) { 12737 if (mOnSystemUiVisibilityChangeListener != null) { 12738 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 12739 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 12740 } 12741 } 12742 12743 /** 12744 * Creates an image that the system displays during the drag and drop 12745 * operation. This is called a "drag shadow". The default implementation 12746 * for a DragShadowBuilder based on a View returns an image that has exactly the same 12747 * appearance as the given View. The default also positions the center of the drag shadow 12748 * directly under the touch point. If no View is provided (the constructor with no parameters 12749 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 12750 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 12751 * default is an invisible drag shadow. 12752 * <p> 12753 * You are not required to use the View you provide to the constructor as the basis of the 12754 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 12755 * anything you want as the drag shadow. 12756 * </p> 12757 * <p> 12758 * You pass a DragShadowBuilder object to the system when you start the drag. The system 12759 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 12760 * size and position of the drag shadow. It uses this data to construct a 12761 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 12762 * so that your application can draw the shadow image in the Canvas. 12763 * </p> 12764 */ 12765 public static class DragShadowBuilder { 12766 private final WeakReference<View> mView; 12767 12768 /** 12769 * Constructs a shadow image builder based on a View. By default, the resulting drag 12770 * shadow will have the same appearance and dimensions as the View, with the touch point 12771 * over the center of the View. 12772 * @param view A View. Any View in scope can be used. 12773 */ 12774 public DragShadowBuilder(View view) { 12775 mView = new WeakReference<View>(view); 12776 } 12777 12778 /** 12779 * Construct a shadow builder object with no associated View. This 12780 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 12781 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 12782 * to supply the drag shadow's dimensions and appearance without 12783 * reference to any View object. If they are not overridden, then the result is an 12784 * invisible drag shadow. 12785 */ 12786 public DragShadowBuilder() { 12787 mView = new WeakReference<View>(null); 12788 } 12789 12790 /** 12791 * Returns the View object that had been passed to the 12792 * {@link #View.DragShadowBuilder(View)} 12793 * constructor. If that View parameter was {@code null} or if the 12794 * {@link #View.DragShadowBuilder()} 12795 * constructor was used to instantiate the builder object, this method will return 12796 * null. 12797 * 12798 * @return The View object associate with this builder object. 12799 */ 12800 @SuppressWarnings({"JavadocReference"}) 12801 final public View getView() { 12802 return mView.get(); 12803 } 12804 12805 /** 12806 * Provides the metrics for the shadow image. These include the dimensions of 12807 * the shadow image, and the point within that shadow that should 12808 * be centered under the touch location while dragging. 12809 * <p> 12810 * The default implementation sets the dimensions of the shadow to be the 12811 * same as the dimensions of the View itself and centers the shadow under 12812 * the touch point. 12813 * </p> 12814 * 12815 * @param shadowSize A {@link android.graphics.Point} containing the width and height 12816 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 12817 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 12818 * image. 12819 * 12820 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 12821 * shadow image that should be underneath the touch point during the drag and drop 12822 * operation. Your application must set {@link android.graphics.Point#x} to the 12823 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 12824 */ 12825 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 12826 final View view = mView.get(); 12827 if (view != null) { 12828 shadowSize.set(view.getWidth(), view.getHeight()); 12829 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 12830 } else { 12831 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 12832 } 12833 } 12834 12835 /** 12836 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 12837 * based on the dimensions it received from the 12838 * {@link #onProvideShadowMetrics(Point, Point)} callback. 12839 * 12840 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 12841 */ 12842 public void onDrawShadow(Canvas canvas) { 12843 final View view = mView.get(); 12844 if (view != null) { 12845 view.draw(canvas); 12846 } else { 12847 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 12848 } 12849 } 12850 } 12851 12852 /** 12853 * Starts a drag and drop operation. When your application calls this method, it passes a 12854 * {@link android.view.View.DragShadowBuilder} object to the system. The 12855 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 12856 * to get metrics for the drag shadow, and then calls the object's 12857 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 12858 * <p> 12859 * Once the system has the drag shadow, it begins the drag and drop operation by sending 12860 * drag events to all the View objects in your application that are currently visible. It does 12861 * this either by calling the View object's drag listener (an implementation of 12862 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 12863 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 12864 * Both are passed a {@link android.view.DragEvent} object that has a 12865 * {@link android.view.DragEvent#getAction()} value of 12866 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 12867 * </p> 12868 * <p> 12869 * Your application can invoke startDrag() on any attached View object. The View object does not 12870 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 12871 * be related to the View the user selected for dragging. 12872 * </p> 12873 * @param data A {@link android.content.ClipData} object pointing to the data to be 12874 * transferred by the drag and drop operation. 12875 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 12876 * drag shadow. 12877 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 12878 * drop operation. This Object is put into every DragEvent object sent by the system during the 12879 * current drag. 12880 * <p> 12881 * myLocalState is a lightweight mechanism for the sending information from the dragged View 12882 * to the target Views. For example, it can contain flags that differentiate between a 12883 * a copy operation and a move operation. 12884 * </p> 12885 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 12886 * so the parameter should be set to 0. 12887 * @return {@code true} if the method completes successfully, or 12888 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 12889 * do a drag, and so no drag operation is in progress. 12890 */ 12891 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 12892 Object myLocalState, int flags) { 12893 if (ViewDebug.DEBUG_DRAG) { 12894 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 12895 } 12896 boolean okay = false; 12897 12898 Point shadowSize = new Point(); 12899 Point shadowTouchPoint = new Point(); 12900 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 12901 12902 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 12903 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 12904 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 12905 } 12906 12907 if (ViewDebug.DEBUG_DRAG) { 12908 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 12909 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 12910 } 12911 Surface surface = new Surface(); 12912 try { 12913 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 12914 flags, shadowSize.x, shadowSize.y, surface); 12915 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 12916 + " surface=" + surface); 12917 if (token != null) { 12918 Canvas canvas = surface.lockCanvas(null); 12919 try { 12920 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 12921 shadowBuilder.onDrawShadow(canvas); 12922 } finally { 12923 surface.unlockCanvasAndPost(canvas); 12924 } 12925 12926 final ViewRootImpl root = getViewRootImpl(); 12927 12928 // Cache the local state object for delivery with DragEvents 12929 root.setLocalDragState(myLocalState); 12930 12931 // repurpose 'shadowSize' for the last touch point 12932 root.getLastTouchPoint(shadowSize); 12933 12934 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 12935 shadowSize.x, shadowSize.y, 12936 shadowTouchPoint.x, shadowTouchPoint.y, data); 12937 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 12938 } 12939 } catch (Exception e) { 12940 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 12941 surface.destroy(); 12942 } 12943 12944 return okay; 12945 } 12946 12947 /** 12948 * Handles drag events sent by the system following a call to 12949 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 12950 *<p> 12951 * When the system calls this method, it passes a 12952 * {@link android.view.DragEvent} object. A call to 12953 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 12954 * in DragEvent. The method uses these to determine what is happening in the drag and drop 12955 * operation. 12956 * @param event The {@link android.view.DragEvent} sent by the system. 12957 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 12958 * in DragEvent, indicating the type of drag event represented by this object. 12959 * @return {@code true} if the method was successful, otherwise {@code false}. 12960 * <p> 12961 * The method should return {@code true} in response to an action type of 12962 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 12963 * operation. 12964 * </p> 12965 * <p> 12966 * The method should also return {@code true} in response to an action type of 12967 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 12968 * {@code false} if it didn't. 12969 * </p> 12970 */ 12971 public boolean onDragEvent(DragEvent event) { 12972 return false; 12973 } 12974 12975 /** 12976 * Detects if this View is enabled and has a drag event listener. 12977 * If both are true, then it calls the drag event listener with the 12978 * {@link android.view.DragEvent} it received. If the drag event listener returns 12979 * {@code true}, then dispatchDragEvent() returns {@code true}. 12980 * <p> 12981 * For all other cases, the method calls the 12982 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 12983 * method and returns its result. 12984 * </p> 12985 * <p> 12986 * This ensures that a drag event is always consumed, even if the View does not have a drag 12987 * event listener. However, if the View has a listener and the listener returns true, then 12988 * onDragEvent() is not called. 12989 * </p> 12990 */ 12991 public boolean dispatchDragEvent(DragEvent event) { 12992 //noinspection SimplifiableIfStatement 12993 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 12994 && mOnDragListener.onDrag(this, event)) { 12995 return true; 12996 } 12997 return onDragEvent(event); 12998 } 12999 13000 boolean canAcceptDrag() { 13001 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 13002 } 13003 13004 /** 13005 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 13006 * it is ever exposed at all. 13007 * @hide 13008 */ 13009 public void onCloseSystemDialogs(String reason) { 13010 } 13011 13012 /** 13013 * Given a Drawable whose bounds have been set to draw into this view, 13014 * update a Region being computed for 13015 * {@link #gatherTransparentRegion(android.graphics.Region)} so 13016 * that any non-transparent parts of the Drawable are removed from the 13017 * given transparent region. 13018 * 13019 * @param dr The Drawable whose transparency is to be applied to the region. 13020 * @param region A Region holding the current transparency information, 13021 * where any parts of the region that are set are considered to be 13022 * transparent. On return, this region will be modified to have the 13023 * transparency information reduced by the corresponding parts of the 13024 * Drawable that are not transparent. 13025 * {@hide} 13026 */ 13027 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 13028 if (DBG) { 13029 Log.i("View", "Getting transparent region for: " + this); 13030 } 13031 final Region r = dr.getTransparentRegion(); 13032 final Rect db = dr.getBounds(); 13033 final AttachInfo attachInfo = mAttachInfo; 13034 if (r != null && attachInfo != null) { 13035 final int w = getRight()-getLeft(); 13036 final int h = getBottom()-getTop(); 13037 if (db.left > 0) { 13038 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 13039 r.op(0, 0, db.left, h, Region.Op.UNION); 13040 } 13041 if (db.right < w) { 13042 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 13043 r.op(db.right, 0, w, h, Region.Op.UNION); 13044 } 13045 if (db.top > 0) { 13046 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 13047 r.op(0, 0, w, db.top, Region.Op.UNION); 13048 } 13049 if (db.bottom < h) { 13050 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 13051 r.op(0, db.bottom, w, h, Region.Op.UNION); 13052 } 13053 final int[] location = attachInfo.mTransparentLocation; 13054 getLocationInWindow(location); 13055 r.translate(location[0], location[1]); 13056 region.op(r, Region.Op.INTERSECT); 13057 } else { 13058 region.op(db, Region.Op.DIFFERENCE); 13059 } 13060 } 13061 13062 private void checkForLongClick(int delayOffset) { 13063 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 13064 mHasPerformedLongPress = false; 13065 13066 if (mPendingCheckForLongPress == null) { 13067 mPendingCheckForLongPress = new CheckForLongPress(); 13068 } 13069 mPendingCheckForLongPress.rememberWindowAttachCount(); 13070 postDelayed(mPendingCheckForLongPress, 13071 ViewConfiguration.getLongPressTimeout() - delayOffset); 13072 } 13073 } 13074 13075 /** 13076 * Inflate a view from an XML resource. This convenience method wraps the {@link 13077 * LayoutInflater} class, which provides a full range of options for view inflation. 13078 * 13079 * @param context The Context object for your activity or application. 13080 * @param resource The resource ID to inflate 13081 * @param root A view group that will be the parent. Used to properly inflate the 13082 * layout_* parameters. 13083 * @see LayoutInflater 13084 */ 13085 public static View inflate(Context context, int resource, ViewGroup root) { 13086 LayoutInflater factory = LayoutInflater.from(context); 13087 return factory.inflate(resource, root); 13088 } 13089 13090 /** 13091 * Scroll the view with standard behavior for scrolling beyond the normal 13092 * content boundaries. Views that call this method should override 13093 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 13094 * results of an over-scroll operation. 13095 * 13096 * Views can use this method to handle any touch or fling-based scrolling. 13097 * 13098 * @param deltaX Change in X in pixels 13099 * @param deltaY Change in Y in pixels 13100 * @param scrollX Current X scroll value in pixels before applying deltaX 13101 * @param scrollY Current Y scroll value in pixels before applying deltaY 13102 * @param scrollRangeX Maximum content scroll range along the X axis 13103 * @param scrollRangeY Maximum content scroll range along the Y axis 13104 * @param maxOverScrollX Number of pixels to overscroll by in either direction 13105 * along the X axis. 13106 * @param maxOverScrollY Number of pixels to overscroll by in either direction 13107 * along the Y axis. 13108 * @param isTouchEvent true if this scroll operation is the result of a touch event. 13109 * @return true if scrolling was clamped to an over-scroll boundary along either 13110 * axis, false otherwise. 13111 */ 13112 @SuppressWarnings({"UnusedParameters"}) 13113 protected boolean overScrollBy(int deltaX, int deltaY, 13114 int scrollX, int scrollY, 13115 int scrollRangeX, int scrollRangeY, 13116 int maxOverScrollX, int maxOverScrollY, 13117 boolean isTouchEvent) { 13118 final int overScrollMode = mOverScrollMode; 13119 final boolean canScrollHorizontal = 13120 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 13121 final boolean canScrollVertical = 13122 computeVerticalScrollRange() > computeVerticalScrollExtent(); 13123 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 13124 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 13125 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 13126 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 13127 13128 int newScrollX = scrollX + deltaX; 13129 if (!overScrollHorizontal) { 13130 maxOverScrollX = 0; 13131 } 13132 13133 int newScrollY = scrollY + deltaY; 13134 if (!overScrollVertical) { 13135 maxOverScrollY = 0; 13136 } 13137 13138 // Clamp values if at the limits and record 13139 final int left = -maxOverScrollX; 13140 final int right = maxOverScrollX + scrollRangeX; 13141 final int top = -maxOverScrollY; 13142 final int bottom = maxOverScrollY + scrollRangeY; 13143 13144 boolean clampedX = false; 13145 if (newScrollX > right) { 13146 newScrollX = right; 13147 clampedX = true; 13148 } else if (newScrollX < left) { 13149 newScrollX = left; 13150 clampedX = true; 13151 } 13152 13153 boolean clampedY = false; 13154 if (newScrollY > bottom) { 13155 newScrollY = bottom; 13156 clampedY = true; 13157 } else if (newScrollY < top) { 13158 newScrollY = top; 13159 clampedY = true; 13160 } 13161 13162 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 13163 13164 return clampedX || clampedY; 13165 } 13166 13167 /** 13168 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 13169 * respond to the results of an over-scroll operation. 13170 * 13171 * @param scrollX New X scroll value in pixels 13172 * @param scrollY New Y scroll value in pixels 13173 * @param clampedX True if scrollX was clamped to an over-scroll boundary 13174 * @param clampedY True if scrollY was clamped to an over-scroll boundary 13175 */ 13176 protected void onOverScrolled(int scrollX, int scrollY, 13177 boolean clampedX, boolean clampedY) { 13178 // Intentionally empty. 13179 } 13180 13181 /** 13182 * Returns the over-scroll mode for this view. The result will be 13183 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13184 * (allow over-scrolling only if the view content is larger than the container), 13185 * or {@link #OVER_SCROLL_NEVER}. 13186 * 13187 * @return This view's over-scroll mode. 13188 */ 13189 public int getOverScrollMode() { 13190 return mOverScrollMode; 13191 } 13192 13193 /** 13194 * Set the over-scroll mode for this view. Valid over-scroll modes are 13195 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13196 * (allow over-scrolling only if the view content is larger than the container), 13197 * or {@link #OVER_SCROLL_NEVER}. 13198 * 13199 * Setting the over-scroll mode of a view will have an effect only if the 13200 * view is capable of scrolling. 13201 * 13202 * @param overScrollMode The new over-scroll mode for this view. 13203 */ 13204 public void setOverScrollMode(int overScrollMode) { 13205 if (overScrollMode != OVER_SCROLL_ALWAYS && 13206 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 13207 overScrollMode != OVER_SCROLL_NEVER) { 13208 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 13209 } 13210 mOverScrollMode = overScrollMode; 13211 } 13212 13213 /** 13214 * Gets a scale factor that determines the distance the view should scroll 13215 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 13216 * @return The vertical scroll scale factor. 13217 * @hide 13218 */ 13219 protected float getVerticalScrollFactor() { 13220 if (mVerticalScrollFactor == 0) { 13221 TypedValue outValue = new TypedValue(); 13222 if (!mContext.getTheme().resolveAttribute( 13223 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 13224 throw new IllegalStateException( 13225 "Expected theme to define listPreferredItemHeight."); 13226 } 13227 mVerticalScrollFactor = outValue.getDimension( 13228 mContext.getResources().getDisplayMetrics()); 13229 } 13230 return mVerticalScrollFactor; 13231 } 13232 13233 /** 13234 * Gets a scale factor that determines the distance the view should scroll 13235 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 13236 * @return The horizontal scroll scale factor. 13237 * @hide 13238 */ 13239 protected float getHorizontalScrollFactor() { 13240 // TODO: Should use something else. 13241 return getVerticalScrollFactor(); 13242 } 13243 13244 /** 13245 * Return the value specifying the text direction or policy that was set with 13246 * {@link #setTextDirection(int)}. 13247 * 13248 * @return the defined text direction. It can be one of: 13249 * 13250 * {@link #TEXT_DIRECTION_INHERIT}, 13251 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13252 * {@link #TEXT_DIRECTION_ANY_RTL}, 13253 * {@link #TEXT_DIRECTION_CHAR_COUNT}, 13254 * {@link #TEXT_DIRECTION_LTR}, 13255 * {@link #TEXT_DIRECTION_RTL}, 13256 * 13257 * @hide 13258 */ 13259 public int getTextDirection() { 13260 return mTextDirection; 13261 } 13262 13263 /** 13264 * Set the text direction. 13265 * 13266 * @param textDirection the direction to set. Should be one of: 13267 * 13268 * {@link #TEXT_DIRECTION_INHERIT}, 13269 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13270 * {@link #TEXT_DIRECTION_ANY_RTL}, 13271 * {@link #TEXT_DIRECTION_CHAR_COUNT}, 13272 * {@link #TEXT_DIRECTION_LTR}, 13273 * {@link #TEXT_DIRECTION_RTL}, 13274 * 13275 * @hide 13276 */ 13277 public void setTextDirection(int textDirection) { 13278 if (textDirection != mTextDirection) { 13279 mTextDirection = textDirection; 13280 resetResolvedTextDirection(); 13281 requestLayout(); 13282 } 13283 } 13284 13285 /** 13286 * Return the resolved text direction. 13287 * 13288 * @return the resolved text direction. Return one of: 13289 * 13290 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13291 * {@link #TEXT_DIRECTION_ANY_RTL}, 13292 * {@link #TEXT_DIRECTION_CHAR_COUNT}, 13293 * {@link #TEXT_DIRECTION_LTR}, 13294 * {@link #TEXT_DIRECTION_RTL}, 13295 * 13296 * @hide 13297 */ 13298 public int getResolvedTextDirection() { 13299 if (mResolvedTextDirection == TEXT_DIRECTION_INHERIT) { 13300 resolveTextDirection(); 13301 } 13302 return mResolvedTextDirection; 13303 } 13304 13305 /** 13306 * Resolve the text direction. 13307 */ 13308 protected void resolveTextDirection() { 13309 if (mTextDirection != TEXT_DIRECTION_INHERIT) { 13310 mResolvedTextDirection = mTextDirection; 13311 return; 13312 } 13313 if (mParent != null && mParent instanceof ViewGroup) { 13314 mResolvedTextDirection = ((ViewGroup) mParent).getResolvedTextDirection(); 13315 return; 13316 } 13317 mResolvedTextDirection = TEXT_DIRECTION_FIRST_STRONG; 13318 } 13319 13320 /** 13321 * Reset resolved text direction. Will be resolved during a call to getResolvedTextDirection(). 13322 */ 13323 protected void resetResolvedTextDirection() { 13324 mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 13325 } 13326 13327 // 13328 // Properties 13329 // 13330 /** 13331 * A Property wrapper around the <code>alpha</code> functionality handled by the 13332 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 13333 */ 13334 public static Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 13335 @Override 13336 public void setValue(View object, float value) { 13337 object.setAlpha(value); 13338 } 13339 13340 @Override 13341 public Float get(View object) { 13342 return object.getAlpha(); 13343 } 13344 }; 13345 13346 /** 13347 * A Property wrapper around the <code>translationX</code> functionality handled by the 13348 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 13349 */ 13350 public static Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 13351 @Override 13352 public void setValue(View object, float value) { 13353 object.setTranslationX(value); 13354 } 13355 13356 @Override 13357 public Float get(View object) { 13358 return object.getTranslationX(); 13359 } 13360 }; 13361 13362 /** 13363 * A Property wrapper around the <code>translationY</code> functionality handled by the 13364 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 13365 */ 13366 public static Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 13367 @Override 13368 public void setValue(View object, float value) { 13369 object.setTranslationY(value); 13370 } 13371 13372 @Override 13373 public Float get(View object) { 13374 return object.getTranslationY(); 13375 } 13376 }; 13377 13378 /** 13379 * A Property wrapper around the <code>x</code> functionality handled by the 13380 * {@link View#setX(float)} and {@link View#getX()} methods. 13381 */ 13382 public static Property<View, Float> X = new FloatProperty<View>("x") { 13383 @Override 13384 public void setValue(View object, float value) { 13385 object.setX(value); 13386 } 13387 13388 @Override 13389 public Float get(View object) { 13390 return object.getX(); 13391 } 13392 }; 13393 13394 /** 13395 * A Property wrapper around the <code>y</code> functionality handled by the 13396 * {@link View#setY(float)} and {@link View#getY()} methods. 13397 */ 13398 public static Property<View, Float> Y = new FloatProperty<View>("y") { 13399 @Override 13400 public void setValue(View object, float value) { 13401 object.setY(value); 13402 } 13403 13404 @Override 13405 public Float get(View object) { 13406 return object.getY(); 13407 } 13408 }; 13409 13410 /** 13411 * A Property wrapper around the <code>rotation</code> functionality handled by the 13412 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 13413 */ 13414 public static Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 13415 @Override 13416 public void setValue(View object, float value) { 13417 object.setRotation(value); 13418 } 13419 13420 @Override 13421 public Float get(View object) { 13422 return object.getRotation(); 13423 } 13424 }; 13425 13426 /** 13427 * A Property wrapper around the <code>rotationX</code> functionality handled by the 13428 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 13429 */ 13430 public static Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 13431 @Override 13432 public void setValue(View object, float value) { 13433 object.setRotationX(value); 13434 } 13435 13436 @Override 13437 public Float get(View object) { 13438 return object.getRotationX(); 13439 } 13440 }; 13441 13442 /** 13443 * A Property wrapper around the <code>rotationY</code> functionality handled by the 13444 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 13445 */ 13446 public static Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 13447 @Override 13448 public void setValue(View object, float value) { 13449 object.setRotationY(value); 13450 } 13451 13452 @Override 13453 public Float get(View object) { 13454 return object.getRotationY(); 13455 } 13456 }; 13457 13458 /** 13459 * A Property wrapper around the <code>scaleX</code> functionality handled by the 13460 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 13461 */ 13462 public static Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 13463 @Override 13464 public void setValue(View object, float value) { 13465 object.setScaleX(value); 13466 } 13467 13468 @Override 13469 public Float get(View object) { 13470 return object.getScaleX(); 13471 } 13472 }; 13473 13474 /** 13475 * A Property wrapper around the <code>scaleY</code> functionality handled by the 13476 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 13477 */ 13478 public static Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 13479 @Override 13480 public void setValue(View object, float value) { 13481 object.setScaleY(value); 13482 } 13483 13484 @Override 13485 public Float get(View object) { 13486 return object.getScaleY(); 13487 } 13488 }; 13489 13490 /** 13491 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 13492 * Each MeasureSpec represents a requirement for either the width or the height. 13493 * A MeasureSpec is comprised of a size and a mode. There are three possible 13494 * modes: 13495 * <dl> 13496 * <dt>UNSPECIFIED</dt> 13497 * <dd> 13498 * The parent has not imposed any constraint on the child. It can be whatever size 13499 * it wants. 13500 * </dd> 13501 * 13502 * <dt>EXACTLY</dt> 13503 * <dd> 13504 * The parent has determined an exact size for the child. The child is going to be 13505 * given those bounds regardless of how big it wants to be. 13506 * </dd> 13507 * 13508 * <dt>AT_MOST</dt> 13509 * <dd> 13510 * The child can be as large as it wants up to the specified size. 13511 * </dd> 13512 * </dl> 13513 * 13514 * MeasureSpecs are implemented as ints to reduce object allocation. This class 13515 * is provided to pack and unpack the <size, mode> tuple into the int. 13516 */ 13517 public static class MeasureSpec { 13518 private static final int MODE_SHIFT = 30; 13519 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 13520 13521 /** 13522 * Measure specification mode: The parent has not imposed any constraint 13523 * on the child. It can be whatever size it wants. 13524 */ 13525 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 13526 13527 /** 13528 * Measure specification mode: The parent has determined an exact size 13529 * for the child. The child is going to be given those bounds regardless 13530 * of how big it wants to be. 13531 */ 13532 public static final int EXACTLY = 1 << MODE_SHIFT; 13533 13534 /** 13535 * Measure specification mode: The child can be as large as it wants up 13536 * to the specified size. 13537 */ 13538 public static final int AT_MOST = 2 << MODE_SHIFT; 13539 13540 /** 13541 * Creates a measure specification based on the supplied size and mode. 13542 * 13543 * The mode must always be one of the following: 13544 * <ul> 13545 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 13546 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 13547 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 13548 * </ul> 13549 * 13550 * @param size the size of the measure specification 13551 * @param mode the mode of the measure specification 13552 * @return the measure specification based on size and mode 13553 */ 13554 public static int makeMeasureSpec(int size, int mode) { 13555 return size + mode; 13556 } 13557 13558 /** 13559 * Extracts the mode from the supplied measure specification. 13560 * 13561 * @param measureSpec the measure specification to extract the mode from 13562 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 13563 * {@link android.view.View.MeasureSpec#AT_MOST} or 13564 * {@link android.view.View.MeasureSpec#EXACTLY} 13565 */ 13566 public static int getMode(int measureSpec) { 13567 return (measureSpec & MODE_MASK); 13568 } 13569 13570 /** 13571 * Extracts the size from the supplied measure specification. 13572 * 13573 * @param measureSpec the measure specification to extract the size from 13574 * @return the size in pixels defined in the supplied measure specification 13575 */ 13576 public static int getSize(int measureSpec) { 13577 return (measureSpec & ~MODE_MASK); 13578 } 13579 13580 /** 13581 * Returns a String representation of the specified measure 13582 * specification. 13583 * 13584 * @param measureSpec the measure specification to convert to a String 13585 * @return a String with the following format: "MeasureSpec: MODE SIZE" 13586 */ 13587 public static String toString(int measureSpec) { 13588 int mode = getMode(measureSpec); 13589 int size = getSize(measureSpec); 13590 13591 StringBuilder sb = new StringBuilder("MeasureSpec: "); 13592 13593 if (mode == UNSPECIFIED) 13594 sb.append("UNSPECIFIED "); 13595 else if (mode == EXACTLY) 13596 sb.append("EXACTLY "); 13597 else if (mode == AT_MOST) 13598 sb.append("AT_MOST "); 13599 else 13600 sb.append(mode).append(" "); 13601 13602 sb.append(size); 13603 return sb.toString(); 13604 } 13605 } 13606 13607 class CheckForLongPress implements Runnable { 13608 13609 private int mOriginalWindowAttachCount; 13610 13611 public void run() { 13612 if (isPressed() && (mParent != null) 13613 && mOriginalWindowAttachCount == mWindowAttachCount) { 13614 if (performLongClick()) { 13615 mHasPerformedLongPress = true; 13616 } 13617 } 13618 } 13619 13620 public void rememberWindowAttachCount() { 13621 mOriginalWindowAttachCount = mWindowAttachCount; 13622 } 13623 } 13624 13625 private final class CheckForTap implements Runnable { 13626 public void run() { 13627 mPrivateFlags &= ~PREPRESSED; 13628 mPrivateFlags |= PRESSED; 13629 refreshDrawableState(); 13630 checkForLongClick(ViewConfiguration.getTapTimeout()); 13631 } 13632 } 13633 13634 private final class PerformClick implements Runnable { 13635 public void run() { 13636 performClick(); 13637 } 13638 } 13639 13640 /** @hide */ 13641 public void hackTurnOffWindowResizeAnim(boolean off) { 13642 mAttachInfo.mTurnOffWindowResizeAnim = off; 13643 } 13644 13645 /** 13646 * This method returns a ViewPropertyAnimator object, which can be used to animate 13647 * specific properties on this View. 13648 * 13649 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 13650 */ 13651 public ViewPropertyAnimator animate() { 13652 if (mAnimator == null) { 13653 mAnimator = new ViewPropertyAnimator(this); 13654 } 13655 return mAnimator; 13656 } 13657 13658 /** 13659 * Interface definition for a callback to be invoked when a key event is 13660 * dispatched to this view. The callback will be invoked before the key 13661 * event is given to the view. 13662 */ 13663 public interface OnKeyListener { 13664 /** 13665 * Called when a key is dispatched to a view. This allows listeners to 13666 * get a chance to respond before the target view. 13667 * 13668 * @param v The view the key has been dispatched to. 13669 * @param keyCode The code for the physical key that was pressed 13670 * @param event The KeyEvent object containing full information about 13671 * the event. 13672 * @return True if the listener has consumed the event, false otherwise. 13673 */ 13674 boolean onKey(View v, int keyCode, KeyEvent event); 13675 } 13676 13677 /** 13678 * Interface definition for a callback to be invoked when a touch event is 13679 * dispatched to this view. The callback will be invoked before the touch 13680 * event is given to the view. 13681 */ 13682 public interface OnTouchListener { 13683 /** 13684 * Called when a touch event is dispatched to a view. This allows listeners to 13685 * get a chance to respond before the target view. 13686 * 13687 * @param v The view the touch event has been dispatched to. 13688 * @param event The MotionEvent object containing full information about 13689 * the event. 13690 * @return True if the listener has consumed the event, false otherwise. 13691 */ 13692 boolean onTouch(View v, MotionEvent event); 13693 } 13694 13695 /** 13696 * Interface definition for a callback to be invoked when a hover event is 13697 * dispatched to this view. The callback will be invoked before the hover 13698 * event is given to the view. 13699 */ 13700 public interface OnHoverListener { 13701 /** 13702 * Called when a hover event is dispatched to a view. This allows listeners to 13703 * get a chance to respond before the target view. 13704 * 13705 * @param v The view the hover event has been dispatched to. 13706 * @param event The MotionEvent object containing full information about 13707 * the event. 13708 * @return True if the listener has consumed the event, false otherwise. 13709 */ 13710 boolean onHover(View v, MotionEvent event); 13711 } 13712 13713 /** 13714 * Interface definition for a callback to be invoked when a generic motion event is 13715 * dispatched to this view. The callback will be invoked before the generic motion 13716 * event is given to the view. 13717 */ 13718 public interface OnGenericMotionListener { 13719 /** 13720 * Called when a generic motion event is dispatched to a view. This allows listeners to 13721 * get a chance to respond before the target view. 13722 * 13723 * @param v The view the generic motion event has been dispatched to. 13724 * @param event The MotionEvent object containing full information about 13725 * the event. 13726 * @return True if the listener has consumed the event, false otherwise. 13727 */ 13728 boolean onGenericMotion(View v, MotionEvent event); 13729 } 13730 13731 /** 13732 * Interface definition for a callback to be invoked when a view has been clicked and held. 13733 */ 13734 public interface OnLongClickListener { 13735 /** 13736 * Called when a view has been clicked and held. 13737 * 13738 * @param v The view that was clicked and held. 13739 * 13740 * @return true if the callback consumed the long click, false otherwise. 13741 */ 13742 boolean onLongClick(View v); 13743 } 13744 13745 /** 13746 * Interface definition for a callback to be invoked when a drag is being dispatched 13747 * to this view. The callback will be invoked before the hosting view's own 13748 * onDrag(event) method. If the listener wants to fall back to the hosting view's 13749 * onDrag(event) behavior, it should return 'false' from this callback. 13750 */ 13751 public interface OnDragListener { 13752 /** 13753 * Called when a drag event is dispatched to a view. This allows listeners 13754 * to get a chance to override base View behavior. 13755 * 13756 * @param v The View that received the drag event. 13757 * @param event The {@link android.view.DragEvent} object for the drag event. 13758 * @return {@code true} if the drag event was handled successfully, or {@code false} 13759 * if the drag event was not handled. Note that {@code false} will trigger the View 13760 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 13761 */ 13762 boolean onDrag(View v, DragEvent event); 13763 } 13764 13765 /** 13766 * Interface definition for a callback to be invoked when the focus state of 13767 * a view changed. 13768 */ 13769 public interface OnFocusChangeListener { 13770 /** 13771 * Called when the focus state of a view has changed. 13772 * 13773 * @param v The view whose state has changed. 13774 * @param hasFocus The new focus state of v. 13775 */ 13776 void onFocusChange(View v, boolean hasFocus); 13777 } 13778 13779 /** 13780 * Interface definition for a callback to be invoked when a view is clicked. 13781 */ 13782 public interface OnClickListener { 13783 /** 13784 * Called when a view has been clicked. 13785 * 13786 * @param v The view that was clicked. 13787 */ 13788 void onClick(View v); 13789 } 13790 13791 /** 13792 * Interface definition for a callback to be invoked when the context menu 13793 * for this view is being built. 13794 */ 13795 public interface OnCreateContextMenuListener { 13796 /** 13797 * Called when the context menu for this view is being built. It is not 13798 * safe to hold onto the menu after this method returns. 13799 * 13800 * @param menu The context menu that is being built 13801 * @param v The view for which the context menu is being built 13802 * @param menuInfo Extra information about the item for which the 13803 * context menu should be shown. This information will vary 13804 * depending on the class of v. 13805 */ 13806 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 13807 } 13808 13809 /** 13810 * Interface definition for a callback to be invoked when the status bar changes 13811 * visibility. 13812 * 13813 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 13814 */ 13815 public interface OnSystemUiVisibilityChangeListener { 13816 /** 13817 * Called when the status bar changes visibility because of a call to 13818 * {@link View#setSystemUiVisibility(int)}. 13819 * 13820 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13821 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13822 */ 13823 public void onSystemUiVisibilityChange(int visibility); 13824 } 13825 13826 /** 13827 * Interface definition for a callback to be invoked when this view is attached 13828 * or detached from its window. 13829 */ 13830 public interface OnAttachStateChangeListener { 13831 /** 13832 * Called when the view is attached to a window. 13833 * @param v The view that was attached 13834 */ 13835 public void onViewAttachedToWindow(View v); 13836 /** 13837 * Called when the view is detached from a window. 13838 * @param v The view that was detached 13839 */ 13840 public void onViewDetachedFromWindow(View v); 13841 } 13842 13843 private final class UnsetPressedState implements Runnable { 13844 public void run() { 13845 setPressed(false); 13846 } 13847 } 13848 13849 /** 13850 * Base class for derived classes that want to save and restore their own 13851 * state in {@link android.view.View#onSaveInstanceState()}. 13852 */ 13853 public static class BaseSavedState extends AbsSavedState { 13854 /** 13855 * Constructor used when reading from a parcel. Reads the state of the superclass. 13856 * 13857 * @param source 13858 */ 13859 public BaseSavedState(Parcel source) { 13860 super(source); 13861 } 13862 13863 /** 13864 * Constructor called by derived classes when creating their SavedState objects 13865 * 13866 * @param superState The state of the superclass of this view 13867 */ 13868 public BaseSavedState(Parcelable superState) { 13869 super(superState); 13870 } 13871 13872 public static final Parcelable.Creator<BaseSavedState> CREATOR = 13873 new Parcelable.Creator<BaseSavedState>() { 13874 public BaseSavedState createFromParcel(Parcel in) { 13875 return new BaseSavedState(in); 13876 } 13877 13878 public BaseSavedState[] newArray(int size) { 13879 return new BaseSavedState[size]; 13880 } 13881 }; 13882 } 13883 13884 /** 13885 * A set of information given to a view when it is attached to its parent 13886 * window. 13887 */ 13888 static class AttachInfo { 13889 interface Callbacks { 13890 void playSoundEffect(int effectId); 13891 boolean performHapticFeedback(int effectId, boolean always); 13892 } 13893 13894 /** 13895 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 13896 * to a Handler. This class contains the target (View) to invalidate and 13897 * the coordinates of the dirty rectangle. 13898 * 13899 * For performance purposes, this class also implements a pool of up to 13900 * POOL_LIMIT objects that get reused. This reduces memory allocations 13901 * whenever possible. 13902 */ 13903 static class InvalidateInfo implements Poolable<InvalidateInfo> { 13904 private static final int POOL_LIMIT = 10; 13905 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 13906 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 13907 public InvalidateInfo newInstance() { 13908 return new InvalidateInfo(); 13909 } 13910 13911 public void onAcquired(InvalidateInfo element) { 13912 } 13913 13914 public void onReleased(InvalidateInfo element) { 13915 element.target = null; 13916 } 13917 }, POOL_LIMIT) 13918 ); 13919 13920 private InvalidateInfo mNext; 13921 private boolean mIsPooled; 13922 13923 View target; 13924 13925 int left; 13926 int top; 13927 int right; 13928 int bottom; 13929 13930 public void setNextPoolable(InvalidateInfo element) { 13931 mNext = element; 13932 } 13933 13934 public InvalidateInfo getNextPoolable() { 13935 return mNext; 13936 } 13937 13938 static InvalidateInfo acquire() { 13939 return sPool.acquire(); 13940 } 13941 13942 void release() { 13943 sPool.release(this); 13944 } 13945 13946 public boolean isPooled() { 13947 return mIsPooled; 13948 } 13949 13950 public void setPooled(boolean isPooled) { 13951 mIsPooled = isPooled; 13952 } 13953 } 13954 13955 final IWindowSession mSession; 13956 13957 final IWindow mWindow; 13958 13959 final IBinder mWindowToken; 13960 13961 final Callbacks mRootCallbacks; 13962 13963 HardwareCanvas mHardwareCanvas; 13964 13965 /** 13966 * The top view of the hierarchy. 13967 */ 13968 View mRootView; 13969 13970 IBinder mPanelParentWindowToken; 13971 Surface mSurface; 13972 13973 boolean mHardwareAccelerated; 13974 boolean mHardwareAccelerationRequested; 13975 HardwareRenderer mHardwareRenderer; 13976 13977 /** 13978 * Scale factor used by the compatibility mode 13979 */ 13980 float mApplicationScale; 13981 13982 /** 13983 * Indicates whether the application is in compatibility mode 13984 */ 13985 boolean mScalingRequired; 13986 13987 /** 13988 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 13989 */ 13990 boolean mTurnOffWindowResizeAnim; 13991 13992 /** 13993 * Left position of this view's window 13994 */ 13995 int mWindowLeft; 13996 13997 /** 13998 * Top position of this view's window 13999 */ 14000 int mWindowTop; 14001 14002 /** 14003 * Indicates whether views need to use 32-bit drawing caches 14004 */ 14005 boolean mUse32BitDrawingCache; 14006 14007 /** 14008 * For windows that are full-screen but using insets to layout inside 14009 * of the screen decorations, these are the current insets for the 14010 * content of the window. 14011 */ 14012 final Rect mContentInsets = new Rect(); 14013 14014 /** 14015 * For windows that are full-screen but using insets to layout inside 14016 * of the screen decorations, these are the current insets for the 14017 * actual visible parts of the window. 14018 */ 14019 final Rect mVisibleInsets = new Rect(); 14020 14021 /** 14022 * The internal insets given by this window. This value is 14023 * supplied by the client (through 14024 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 14025 * be given to the window manager when changed to be used in laying 14026 * out windows behind it. 14027 */ 14028 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 14029 = new ViewTreeObserver.InternalInsetsInfo(); 14030 14031 /** 14032 * All views in the window's hierarchy that serve as scroll containers, 14033 * used to determine if the window can be resized or must be panned 14034 * to adjust for a soft input area. 14035 */ 14036 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 14037 14038 final KeyEvent.DispatcherState mKeyDispatchState 14039 = new KeyEvent.DispatcherState(); 14040 14041 /** 14042 * Indicates whether the view's window currently has the focus. 14043 */ 14044 boolean mHasWindowFocus; 14045 14046 /** 14047 * The current visibility of the window. 14048 */ 14049 int mWindowVisibility; 14050 14051 /** 14052 * Indicates the time at which drawing started to occur. 14053 */ 14054 long mDrawingTime; 14055 14056 /** 14057 * Indicates whether or not ignoring the DIRTY_MASK flags. 14058 */ 14059 boolean mIgnoreDirtyState; 14060 14061 /** 14062 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 14063 * to avoid clearing that flag prematurely. 14064 */ 14065 boolean mSetIgnoreDirtyState = false; 14066 14067 /** 14068 * Indicates whether the view's window is currently in touch mode. 14069 */ 14070 boolean mInTouchMode; 14071 14072 /** 14073 * Indicates that ViewAncestor should trigger a global layout change 14074 * the next time it performs a traversal 14075 */ 14076 boolean mRecomputeGlobalAttributes; 14077 14078 /** 14079 * Set during a traveral if any views want to keep the screen on. 14080 */ 14081 boolean mKeepScreenOn; 14082 14083 /** 14084 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 14085 */ 14086 int mSystemUiVisibility; 14087 14088 /** 14089 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 14090 * attached. 14091 */ 14092 boolean mHasSystemUiListeners; 14093 14094 /** 14095 * Set if the visibility of any views has changed. 14096 */ 14097 boolean mViewVisibilityChanged; 14098 14099 /** 14100 * Set to true if a view has been scrolled. 14101 */ 14102 boolean mViewScrollChanged; 14103 14104 /** 14105 * Global to the view hierarchy used as a temporary for dealing with 14106 * x/y points in the transparent region computations. 14107 */ 14108 final int[] mTransparentLocation = new int[2]; 14109 14110 /** 14111 * Global to the view hierarchy used as a temporary for dealing with 14112 * x/y points in the ViewGroup.invalidateChild implementation. 14113 */ 14114 final int[] mInvalidateChildLocation = new int[2]; 14115 14116 14117 /** 14118 * Global to the view hierarchy used as a temporary for dealing with 14119 * x/y location when view is transformed. 14120 */ 14121 final float[] mTmpTransformLocation = new float[2]; 14122 14123 /** 14124 * The view tree observer used to dispatch global events like 14125 * layout, pre-draw, touch mode change, etc. 14126 */ 14127 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 14128 14129 /** 14130 * A Canvas used by the view hierarchy to perform bitmap caching. 14131 */ 14132 Canvas mCanvas; 14133 14134 /** 14135 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 14136 * handler can be used to pump events in the UI events queue. 14137 */ 14138 final Handler mHandler; 14139 14140 /** 14141 * Identifier for messages requesting the view to be invalidated. 14142 * Such messages should be sent to {@link #mHandler}. 14143 */ 14144 static final int INVALIDATE_MSG = 0x1; 14145 14146 /** 14147 * Identifier for messages requesting the view to invalidate a region. 14148 * Such messages should be sent to {@link #mHandler}. 14149 */ 14150 static final int INVALIDATE_RECT_MSG = 0x2; 14151 14152 /** 14153 * Temporary for use in computing invalidate rectangles while 14154 * calling up the hierarchy. 14155 */ 14156 final Rect mTmpInvalRect = new Rect(); 14157 14158 /** 14159 * Temporary for use in computing hit areas with transformed views 14160 */ 14161 final RectF mTmpTransformRect = new RectF(); 14162 14163 /** 14164 * Temporary list for use in collecting focusable descendents of a view. 14165 */ 14166 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 14167 14168 /** 14169 * The id of the window for accessibility purposes. 14170 */ 14171 int mAccessibilityWindowId = View.NO_ID; 14172 14173 /** 14174 * Creates a new set of attachment information with the specified 14175 * events handler and thread. 14176 * 14177 * @param handler the events handler the view must use 14178 */ 14179 AttachInfo(IWindowSession session, IWindow window, 14180 Handler handler, Callbacks effectPlayer) { 14181 mSession = session; 14182 mWindow = window; 14183 mWindowToken = window.asBinder(); 14184 mHandler = handler; 14185 mRootCallbacks = effectPlayer; 14186 } 14187 } 14188 14189 /** 14190 * <p>ScrollabilityCache holds various fields used by a View when scrolling 14191 * is supported. This avoids keeping too many unused fields in most 14192 * instances of View.</p> 14193 */ 14194 private static class ScrollabilityCache implements Runnable { 14195 14196 /** 14197 * Scrollbars are not visible 14198 */ 14199 public static final int OFF = 0; 14200 14201 /** 14202 * Scrollbars are visible 14203 */ 14204 public static final int ON = 1; 14205 14206 /** 14207 * Scrollbars are fading away 14208 */ 14209 public static final int FADING = 2; 14210 14211 public boolean fadeScrollBars; 14212 14213 public int fadingEdgeLength; 14214 public int scrollBarDefaultDelayBeforeFade; 14215 public int scrollBarFadeDuration; 14216 14217 public int scrollBarSize; 14218 public ScrollBarDrawable scrollBar; 14219 public float[] interpolatorValues; 14220 public View host; 14221 14222 public final Paint paint; 14223 public final Matrix matrix; 14224 public Shader shader; 14225 14226 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 14227 14228 private static final float[] OPAQUE = { 255 }; 14229 private static final float[] TRANSPARENT = { 0.0f }; 14230 14231 /** 14232 * When fading should start. This time moves into the future every time 14233 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 14234 */ 14235 public long fadeStartTime; 14236 14237 14238 /** 14239 * The current state of the scrollbars: ON, OFF, or FADING 14240 */ 14241 public int state = OFF; 14242 14243 private int mLastColor; 14244 14245 public ScrollabilityCache(ViewConfiguration configuration, View host) { 14246 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 14247 scrollBarSize = configuration.getScaledScrollBarSize(); 14248 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 14249 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 14250 14251 paint = new Paint(); 14252 matrix = new Matrix(); 14253 // use use a height of 1, and then wack the matrix each time we 14254 // actually use it. 14255 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 14256 14257 paint.setShader(shader); 14258 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 14259 this.host = host; 14260 } 14261 14262 public void setFadeColor(int color) { 14263 if (color != 0 && color != mLastColor) { 14264 mLastColor = color; 14265 color |= 0xFF000000; 14266 14267 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 14268 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 14269 14270 paint.setShader(shader); 14271 // Restore the default transfer mode (src_over) 14272 paint.setXfermode(null); 14273 } 14274 } 14275 14276 public void run() { 14277 long now = AnimationUtils.currentAnimationTimeMillis(); 14278 if (now >= fadeStartTime) { 14279 14280 // the animation fades the scrollbars out by changing 14281 // the opacity (alpha) from fully opaque to fully 14282 // transparent 14283 int nextFrame = (int) now; 14284 int framesCount = 0; 14285 14286 Interpolator interpolator = scrollBarInterpolator; 14287 14288 // Start opaque 14289 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 14290 14291 // End transparent 14292 nextFrame += scrollBarFadeDuration; 14293 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 14294 14295 state = FADING; 14296 14297 // Kick off the fade animation 14298 host.invalidate(true); 14299 } 14300 } 14301 } 14302 14303 /** 14304 * Resuable callback for sending 14305 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 14306 */ 14307 private class SendViewScrolledAccessibilityEvent implements Runnable { 14308 public volatile boolean mIsPending; 14309 14310 public void run() { 14311 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 14312 mIsPending = false; 14313 } 14314 } 14315} 14316