View.java revision 98029c825b9234e6b90721d910cc180885fcab1d
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.util.FloatProperty; 20import android.util.LocaleUtil; 21import android.util.Property; 22import com.android.internal.R; 23import com.android.internal.util.Predicate; 24import com.android.internal.view.menu.MenuBuilder; 25 26import android.content.ClipData; 27import android.content.Context; 28import android.content.res.Configuration; 29import android.content.res.Resources; 30import android.content.res.TypedArray; 31import android.graphics.Bitmap; 32import android.graphics.Camera; 33import android.graphics.Canvas; 34import android.graphics.Interpolator; 35import android.graphics.LinearGradient; 36import android.graphics.Matrix; 37import android.graphics.Paint; 38import android.graphics.PixelFormat; 39import android.graphics.Point; 40import android.graphics.PorterDuff; 41import android.graphics.PorterDuffXfermode; 42import android.graphics.Rect; 43import android.graphics.RectF; 44import android.graphics.Region; 45import android.graphics.Shader; 46import android.graphics.drawable.ColorDrawable; 47import android.graphics.drawable.Drawable; 48import android.os.Handler; 49import android.os.IBinder; 50import android.os.Message; 51import android.os.Parcel; 52import android.os.Parcelable; 53import android.os.RemoteException; 54import android.os.SystemClock; 55import android.util.AttributeSet; 56import android.util.Log; 57import android.util.Pool; 58import android.util.Poolable; 59import android.util.PoolableManager; 60import android.util.Pools; 61import android.util.SparseArray; 62import android.util.TypedValue; 63import android.view.ContextMenu.ContextMenuInfo; 64import android.view.accessibility.AccessibilityEvent; 65import android.view.accessibility.AccessibilityEventSource; 66import android.view.accessibility.AccessibilityManager; 67import android.view.accessibility.AccessibilityNodeInfo; 68import android.view.animation.Animation; 69import android.view.animation.AnimationUtils; 70import android.view.inputmethod.EditorInfo; 71import android.view.inputmethod.InputConnection; 72import android.view.inputmethod.InputMethodManager; 73import android.widget.ScrollBarDrawable; 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()} and {@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. Use with {@link #setVisibility(int)}. 676 */ 677 public static final int VISIBLE = 0x00000000; 678 679 /** 680 * This view is invisible, but it still takes up space for layout purposes. 681 * Use with {@link #setVisibility(int)}. 682 */ 683 public static final int INVISIBLE = 0x00000004; 684 685 /** 686 * This view is invisible, and it doesn't take any space for layout 687 * purposes. Use with {@link #setVisibility(int)}. 688 */ 689 public static final int GONE = 0x00000008; 690 691 /** 692 * Mask for use with setFlags indicating bits used for visibility. 693 * {@hide} 694 */ 695 static final int VISIBILITY_MASK = 0x0000000C; 696 697 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 698 699 /** 700 * This view is enabled. Intrepretation varies by subclass. 701 * Use with ENABLED_MASK when calling setFlags. 702 * {@hide} 703 */ 704 static final int ENABLED = 0x00000000; 705 706 /** 707 * This view is disabled. Intrepretation varies by subclass. 708 * Use with ENABLED_MASK when calling setFlags. 709 * {@hide} 710 */ 711 static final int DISABLED = 0x00000020; 712 713 /** 714 * Mask for use with setFlags indicating bits used for indicating whether 715 * this view is enabled 716 * {@hide} 717 */ 718 static final int ENABLED_MASK = 0x00000020; 719 720 /** 721 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 722 * called and further optimizations will be performed. It is okay to have 723 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 724 * {@hide} 725 */ 726 static final int WILL_NOT_DRAW = 0x00000080; 727 728 /** 729 * Mask for use with setFlags indicating bits used for indicating whether 730 * this view is will draw 731 * {@hide} 732 */ 733 static final int DRAW_MASK = 0x00000080; 734 735 /** 736 * <p>This view doesn't show scrollbars.</p> 737 * {@hide} 738 */ 739 static final int SCROLLBARS_NONE = 0x00000000; 740 741 /** 742 * <p>This view shows horizontal scrollbars.</p> 743 * {@hide} 744 */ 745 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 746 747 /** 748 * <p>This view shows vertical scrollbars.</p> 749 * {@hide} 750 */ 751 static final int SCROLLBARS_VERTICAL = 0x00000200; 752 753 /** 754 * <p>Mask for use with setFlags indicating bits used for indicating which 755 * scrollbars are enabled.</p> 756 * {@hide} 757 */ 758 static final int SCROLLBARS_MASK = 0x00000300; 759 760 /** 761 * Indicates that the view should filter touches when its window is obscured. 762 * Refer to the class comments for more information about this security feature. 763 * {@hide} 764 */ 765 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 766 767 // note flag value 0x00000800 is now available for next flags... 768 769 /** 770 * <p>This view doesn't show fading edges.</p> 771 * {@hide} 772 */ 773 static final int FADING_EDGE_NONE = 0x00000000; 774 775 /** 776 * <p>This view shows horizontal fading edges.</p> 777 * {@hide} 778 */ 779 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 780 781 /** 782 * <p>This view shows vertical fading edges.</p> 783 * {@hide} 784 */ 785 static final int FADING_EDGE_VERTICAL = 0x00002000; 786 787 /** 788 * <p>Mask for use with setFlags indicating bits used for indicating which 789 * fading edges are enabled.</p> 790 * {@hide} 791 */ 792 static final int FADING_EDGE_MASK = 0x00003000; 793 794 /** 795 * <p>Indicates this view can be clicked. When clickable, a View reacts 796 * to clicks by notifying the OnClickListener.<p> 797 * {@hide} 798 */ 799 static final int CLICKABLE = 0x00004000; 800 801 /** 802 * <p>Indicates this view is caching its drawing into a bitmap.</p> 803 * {@hide} 804 */ 805 static final int DRAWING_CACHE_ENABLED = 0x00008000; 806 807 /** 808 * <p>Indicates that no icicle should be saved for this view.<p> 809 * {@hide} 810 */ 811 static final int SAVE_DISABLED = 0x000010000; 812 813 /** 814 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 815 * property.</p> 816 * {@hide} 817 */ 818 static final int SAVE_DISABLED_MASK = 0x000010000; 819 820 /** 821 * <p>Indicates that no drawing cache should ever be created for this view.<p> 822 * {@hide} 823 */ 824 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 825 826 /** 827 * <p>Indicates this view can take / keep focus when int touch mode.</p> 828 * {@hide} 829 */ 830 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 831 832 /** 833 * <p>Enables low quality mode for the drawing cache.</p> 834 */ 835 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 836 837 /** 838 * <p>Enables high quality mode for the drawing cache.</p> 839 */ 840 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 841 842 /** 843 * <p>Enables automatic quality mode for the drawing cache.</p> 844 */ 845 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 846 847 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 848 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 849 }; 850 851 /** 852 * <p>Mask for use with setFlags indicating bits used for the cache 853 * quality property.</p> 854 * {@hide} 855 */ 856 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 857 858 /** 859 * <p> 860 * Indicates this view can be long clicked. When long clickable, a View 861 * reacts to long clicks by notifying the OnLongClickListener or showing a 862 * context menu. 863 * </p> 864 * {@hide} 865 */ 866 static final int LONG_CLICKABLE = 0x00200000; 867 868 /** 869 * <p>Indicates that this view gets its drawable states from its direct parent 870 * and ignores its original internal states.</p> 871 * 872 * @hide 873 */ 874 static final int DUPLICATE_PARENT_STATE = 0x00400000; 875 876 /** 877 * The scrollbar style to display the scrollbars inside the content area, 878 * without increasing the padding. The scrollbars will be overlaid with 879 * translucency on the view's content. 880 */ 881 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 882 883 /** 884 * The scrollbar style to display the scrollbars inside the padded area, 885 * increasing the padding of the view. The scrollbars will not overlap the 886 * content area of the view. 887 */ 888 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 889 890 /** 891 * The scrollbar style to display the scrollbars at the edge of the view, 892 * without increasing the padding. The scrollbars will be overlaid with 893 * translucency. 894 */ 895 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 896 897 /** 898 * The scrollbar style to display the scrollbars at the edge of the view, 899 * increasing the padding of the view. The scrollbars will only overlap the 900 * background, if any. 901 */ 902 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 903 904 /** 905 * Mask to check if the scrollbar style is overlay or inset. 906 * {@hide} 907 */ 908 static final int SCROLLBARS_INSET_MASK = 0x01000000; 909 910 /** 911 * Mask to check if the scrollbar style is inside or outside. 912 * {@hide} 913 */ 914 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 915 916 /** 917 * Mask for scrollbar style. 918 * {@hide} 919 */ 920 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 921 922 /** 923 * View flag indicating that the screen should remain on while the 924 * window containing this view is visible to the user. This effectively 925 * takes care of automatically setting the WindowManager's 926 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 927 */ 928 public static final int KEEP_SCREEN_ON = 0x04000000; 929 930 /** 931 * View flag indicating whether this view should have sound effects enabled 932 * for events such as clicking and touching. 933 */ 934 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 935 936 /** 937 * View flag indicating whether this view should have haptic feedback 938 * enabled for events such as long presses. 939 */ 940 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 941 942 /** 943 * <p>Indicates that the view hierarchy should stop saving state when 944 * it reaches this view. If state saving is initiated immediately at 945 * the view, it will be allowed. 946 * {@hide} 947 */ 948 static final int PARENT_SAVE_DISABLED = 0x20000000; 949 950 /** 951 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 952 * {@hide} 953 */ 954 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 955 956 /** 957 * Horizontal direction of this view is from Left to Right. 958 * Use with {@link #setLayoutDirection}. 959 * {@hide} 960 */ 961 public static final int LAYOUT_DIRECTION_LTR = 0x00000000; 962 963 /** 964 * Horizontal direction of this view is from Right to Left. 965 * Use with {@link #setLayoutDirection}. 966 * {@hide} 967 */ 968 public static final int LAYOUT_DIRECTION_RTL = 0x40000000; 969 970 /** 971 * Horizontal direction of this view is inherited from its parent. 972 * Use with {@link #setLayoutDirection}. 973 * {@hide} 974 */ 975 public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000; 976 977 /** 978 * Horizontal direction of this view is from deduced from the default language 979 * script for the locale. Use with {@link #setLayoutDirection}. 980 * {@hide} 981 */ 982 public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000; 983 984 /** 985 * Mask for use with setFlags indicating bits used for horizontalDirection. 986 * {@hide} 987 */ 988 static final int LAYOUT_DIRECTION_MASK = 0xC0000000; 989 990 /* 991 * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct 992 * flag value. 993 * {@hide} 994 */ 995 private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR, 996 LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE}; 997 998 /** 999 * Default horizontalDirection. 1000 * {@hide} 1001 */ 1002 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1003 1004 /** 1005 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1006 * should add all focusable Views regardless if they are focusable in touch mode. 1007 */ 1008 public static final int FOCUSABLES_ALL = 0x00000000; 1009 1010 /** 1011 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1012 * should add only Views focusable in touch mode. 1013 */ 1014 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1015 1016 /** 1017 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1018 * item. 1019 */ 1020 public static final int FOCUS_BACKWARD = 0x00000001; 1021 1022 /** 1023 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1024 * item. 1025 */ 1026 public static final int FOCUS_FORWARD = 0x00000002; 1027 1028 /** 1029 * Use with {@link #focusSearch(int)}. Move focus to the left. 1030 */ 1031 public static final int FOCUS_LEFT = 0x00000011; 1032 1033 /** 1034 * Use with {@link #focusSearch(int)}. Move focus up. 1035 */ 1036 public static final int FOCUS_UP = 0x00000021; 1037 1038 /** 1039 * Use with {@link #focusSearch(int)}. Move focus to the right. 1040 */ 1041 public static final int FOCUS_RIGHT = 0x00000042; 1042 1043 /** 1044 * Use with {@link #focusSearch(int)}. Move focus down. 1045 */ 1046 public static final int FOCUS_DOWN = 0x00000082; 1047 1048 /** 1049 * Bits of {@link #getMeasuredWidthAndState()} and 1050 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1051 */ 1052 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1053 1054 /** 1055 * Bits of {@link #getMeasuredWidthAndState()} and 1056 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1057 */ 1058 public static final int MEASURED_STATE_MASK = 0xff000000; 1059 1060 /** 1061 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1062 * for functions that combine both width and height into a single int, 1063 * such as {@link #getMeasuredState()} and the childState argument of 1064 * {@link #resolveSizeAndState(int, int, int)}. 1065 */ 1066 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1067 1068 /** 1069 * Bit of {@link #getMeasuredWidthAndState()} and 1070 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1071 * is smaller that the space the view would like to have. 1072 */ 1073 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1074 1075 /** 1076 * Base View state sets 1077 */ 1078 // Singles 1079 /** 1080 * Indicates the view has no states set. States are used with 1081 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1082 * view depending on its state. 1083 * 1084 * @see android.graphics.drawable.Drawable 1085 * @see #getDrawableState() 1086 */ 1087 protected static final int[] EMPTY_STATE_SET; 1088 /** 1089 * Indicates the view is enabled. States are used with 1090 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1091 * view depending on its state. 1092 * 1093 * @see android.graphics.drawable.Drawable 1094 * @see #getDrawableState() 1095 */ 1096 protected static final int[] ENABLED_STATE_SET; 1097 /** 1098 * Indicates the view is focused. States are used with 1099 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1100 * view depending on its state. 1101 * 1102 * @see android.graphics.drawable.Drawable 1103 * @see #getDrawableState() 1104 */ 1105 protected static final int[] FOCUSED_STATE_SET; 1106 /** 1107 * Indicates the view is selected. States are used with 1108 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1109 * view depending on its state. 1110 * 1111 * @see android.graphics.drawable.Drawable 1112 * @see #getDrawableState() 1113 */ 1114 protected static final int[] SELECTED_STATE_SET; 1115 /** 1116 * Indicates the view is pressed. States are used with 1117 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1118 * view depending on its state. 1119 * 1120 * @see android.graphics.drawable.Drawable 1121 * @see #getDrawableState() 1122 * @hide 1123 */ 1124 protected static final int[] PRESSED_STATE_SET; 1125 /** 1126 * Indicates the view's window has focus. States are used with 1127 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1128 * view depending on its state. 1129 * 1130 * @see android.graphics.drawable.Drawable 1131 * @see #getDrawableState() 1132 */ 1133 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1134 // Doubles 1135 /** 1136 * Indicates the view is enabled and has the focus. 1137 * 1138 * @see #ENABLED_STATE_SET 1139 * @see #FOCUSED_STATE_SET 1140 */ 1141 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1142 /** 1143 * Indicates the view is enabled and selected. 1144 * 1145 * @see #ENABLED_STATE_SET 1146 * @see #SELECTED_STATE_SET 1147 */ 1148 protected static final int[] ENABLED_SELECTED_STATE_SET; 1149 /** 1150 * Indicates the view is enabled and that its window has focus. 1151 * 1152 * @see #ENABLED_STATE_SET 1153 * @see #WINDOW_FOCUSED_STATE_SET 1154 */ 1155 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1156 /** 1157 * Indicates the view is focused and selected. 1158 * 1159 * @see #FOCUSED_STATE_SET 1160 * @see #SELECTED_STATE_SET 1161 */ 1162 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1163 /** 1164 * Indicates the view has the focus and that its window has the focus. 1165 * 1166 * @see #FOCUSED_STATE_SET 1167 * @see #WINDOW_FOCUSED_STATE_SET 1168 */ 1169 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1170 /** 1171 * Indicates the view is selected and that its window has the focus. 1172 * 1173 * @see #SELECTED_STATE_SET 1174 * @see #WINDOW_FOCUSED_STATE_SET 1175 */ 1176 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1177 // Triples 1178 /** 1179 * Indicates the view is enabled, focused and selected. 1180 * 1181 * @see #ENABLED_STATE_SET 1182 * @see #FOCUSED_STATE_SET 1183 * @see #SELECTED_STATE_SET 1184 */ 1185 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1186 /** 1187 * Indicates the view is enabled, focused and its window has the focus. 1188 * 1189 * @see #ENABLED_STATE_SET 1190 * @see #FOCUSED_STATE_SET 1191 * @see #WINDOW_FOCUSED_STATE_SET 1192 */ 1193 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1194 /** 1195 * Indicates the view is enabled, selected and its window has the focus. 1196 * 1197 * @see #ENABLED_STATE_SET 1198 * @see #SELECTED_STATE_SET 1199 * @see #WINDOW_FOCUSED_STATE_SET 1200 */ 1201 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1202 /** 1203 * Indicates the view is focused, selected and its window has the focus. 1204 * 1205 * @see #FOCUSED_STATE_SET 1206 * @see #SELECTED_STATE_SET 1207 * @see #WINDOW_FOCUSED_STATE_SET 1208 */ 1209 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1210 /** 1211 * Indicates the view is enabled, focused, selected and its window 1212 * has the focus. 1213 * 1214 * @see #ENABLED_STATE_SET 1215 * @see #FOCUSED_STATE_SET 1216 * @see #SELECTED_STATE_SET 1217 * @see #WINDOW_FOCUSED_STATE_SET 1218 */ 1219 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1220 /** 1221 * Indicates the view is pressed and its window has the focus. 1222 * 1223 * @see #PRESSED_STATE_SET 1224 * @see #WINDOW_FOCUSED_STATE_SET 1225 */ 1226 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1227 /** 1228 * Indicates the view is pressed and selected. 1229 * 1230 * @see #PRESSED_STATE_SET 1231 * @see #SELECTED_STATE_SET 1232 */ 1233 protected static final int[] PRESSED_SELECTED_STATE_SET; 1234 /** 1235 * Indicates the view is pressed, selected and its window has the focus. 1236 * 1237 * @see #PRESSED_STATE_SET 1238 * @see #SELECTED_STATE_SET 1239 * @see #WINDOW_FOCUSED_STATE_SET 1240 */ 1241 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1242 /** 1243 * Indicates the view is pressed and focused. 1244 * 1245 * @see #PRESSED_STATE_SET 1246 * @see #FOCUSED_STATE_SET 1247 */ 1248 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1249 /** 1250 * Indicates the view is pressed, focused and its window has the focus. 1251 * 1252 * @see #PRESSED_STATE_SET 1253 * @see #FOCUSED_STATE_SET 1254 * @see #WINDOW_FOCUSED_STATE_SET 1255 */ 1256 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1257 /** 1258 * Indicates the view is pressed, focused and selected. 1259 * 1260 * @see #PRESSED_STATE_SET 1261 * @see #SELECTED_STATE_SET 1262 * @see #FOCUSED_STATE_SET 1263 */ 1264 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1265 /** 1266 * Indicates the view is pressed, focused, selected and its window has the focus. 1267 * 1268 * @see #PRESSED_STATE_SET 1269 * @see #FOCUSED_STATE_SET 1270 * @see #SELECTED_STATE_SET 1271 * @see #WINDOW_FOCUSED_STATE_SET 1272 */ 1273 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1274 /** 1275 * Indicates the view is pressed and enabled. 1276 * 1277 * @see #PRESSED_STATE_SET 1278 * @see #ENABLED_STATE_SET 1279 */ 1280 protected static final int[] PRESSED_ENABLED_STATE_SET; 1281 /** 1282 * Indicates the view is pressed, enabled and its window has the focus. 1283 * 1284 * @see #PRESSED_STATE_SET 1285 * @see #ENABLED_STATE_SET 1286 * @see #WINDOW_FOCUSED_STATE_SET 1287 */ 1288 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1289 /** 1290 * Indicates the view is pressed, enabled and selected. 1291 * 1292 * @see #PRESSED_STATE_SET 1293 * @see #ENABLED_STATE_SET 1294 * @see #SELECTED_STATE_SET 1295 */ 1296 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1297 /** 1298 * Indicates the view is pressed, enabled, selected and its window has the 1299 * focus. 1300 * 1301 * @see #PRESSED_STATE_SET 1302 * @see #ENABLED_STATE_SET 1303 * @see #SELECTED_STATE_SET 1304 * @see #WINDOW_FOCUSED_STATE_SET 1305 */ 1306 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1307 /** 1308 * Indicates the view is pressed, enabled and focused. 1309 * 1310 * @see #PRESSED_STATE_SET 1311 * @see #ENABLED_STATE_SET 1312 * @see #FOCUSED_STATE_SET 1313 */ 1314 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1315 /** 1316 * Indicates the view is pressed, enabled, focused and its window has the 1317 * focus. 1318 * 1319 * @see #PRESSED_STATE_SET 1320 * @see #ENABLED_STATE_SET 1321 * @see #FOCUSED_STATE_SET 1322 * @see #WINDOW_FOCUSED_STATE_SET 1323 */ 1324 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1325 /** 1326 * Indicates the view is pressed, enabled, focused and selected. 1327 * 1328 * @see #PRESSED_STATE_SET 1329 * @see #ENABLED_STATE_SET 1330 * @see #SELECTED_STATE_SET 1331 * @see #FOCUSED_STATE_SET 1332 */ 1333 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1334 /** 1335 * Indicates the view is pressed, enabled, focused, selected and its window 1336 * has the focus. 1337 * 1338 * @see #PRESSED_STATE_SET 1339 * @see #ENABLED_STATE_SET 1340 * @see #SELECTED_STATE_SET 1341 * @see #FOCUSED_STATE_SET 1342 * @see #WINDOW_FOCUSED_STATE_SET 1343 */ 1344 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1345 1346 /** 1347 * The order here is very important to {@link #getDrawableState()} 1348 */ 1349 private static final int[][] VIEW_STATE_SETS; 1350 1351 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1352 static final int VIEW_STATE_SELECTED = 1 << 1; 1353 static final int VIEW_STATE_FOCUSED = 1 << 2; 1354 static final int VIEW_STATE_ENABLED = 1 << 3; 1355 static final int VIEW_STATE_PRESSED = 1 << 4; 1356 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1357 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1358 static final int VIEW_STATE_HOVERED = 1 << 7; 1359 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1360 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1361 1362 static final int[] VIEW_STATE_IDS = new int[] { 1363 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1364 R.attr.state_selected, VIEW_STATE_SELECTED, 1365 R.attr.state_focused, VIEW_STATE_FOCUSED, 1366 R.attr.state_enabled, VIEW_STATE_ENABLED, 1367 R.attr.state_pressed, VIEW_STATE_PRESSED, 1368 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1369 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1370 R.attr.state_hovered, VIEW_STATE_HOVERED, 1371 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1372 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1373 }; 1374 1375 static { 1376 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1377 throw new IllegalStateException( 1378 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1379 } 1380 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1381 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1382 int viewState = R.styleable.ViewDrawableStates[i]; 1383 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1384 if (VIEW_STATE_IDS[j] == viewState) { 1385 orderedIds[i * 2] = viewState; 1386 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1387 } 1388 } 1389 } 1390 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1391 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1392 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1393 int numBits = Integer.bitCount(i); 1394 int[] set = new int[numBits]; 1395 int pos = 0; 1396 for (int j = 0; j < orderedIds.length; j += 2) { 1397 if ((i & orderedIds[j+1]) != 0) { 1398 set[pos++] = orderedIds[j]; 1399 } 1400 } 1401 VIEW_STATE_SETS[i] = set; 1402 } 1403 1404 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1405 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1406 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1407 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1408 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1409 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1410 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1412 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1413 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1414 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1415 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1416 | VIEW_STATE_FOCUSED]; 1417 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1418 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1420 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1421 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1422 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1423 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1424 | VIEW_STATE_ENABLED]; 1425 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1426 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1427 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1428 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1429 | VIEW_STATE_ENABLED]; 1430 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1431 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1432 | VIEW_STATE_ENABLED]; 1433 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1434 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1435 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1436 1437 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1438 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1439 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1440 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1441 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1442 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1444 | VIEW_STATE_PRESSED]; 1445 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1446 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1447 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1448 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1449 | VIEW_STATE_PRESSED]; 1450 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1451 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1452 | VIEW_STATE_PRESSED]; 1453 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1454 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1455 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1456 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1457 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1458 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1459 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1460 | VIEW_STATE_PRESSED]; 1461 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1463 | VIEW_STATE_PRESSED]; 1464 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1465 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1466 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1467 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1468 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1469 | VIEW_STATE_PRESSED]; 1470 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1471 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1472 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1473 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1474 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1475 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1476 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1477 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1478 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1479 | VIEW_STATE_PRESSED]; 1480 } 1481 1482 /** 1483 * Temporary Rect currently for use in setBackground(). This will probably 1484 * be extended in the future to hold our own class with more than just 1485 * a Rect. :) 1486 */ 1487 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1488 1489 /** 1490 * Map used to store views' tags. 1491 */ 1492 private static WeakHashMap<View, SparseArray<Object>> sTags; 1493 1494 /** 1495 * Lock used to access sTags. 1496 */ 1497 private static final Object sTagsLock = new Object(); 1498 1499 /** 1500 * The next available accessiiblity id. 1501 */ 1502 private static int sNextAccessibilityViewId; 1503 1504 /** 1505 * The animation currently associated with this view. 1506 * @hide 1507 */ 1508 protected Animation mCurrentAnimation = null; 1509 1510 /** 1511 * Width as measured during measure pass. 1512 * {@hide} 1513 */ 1514 @ViewDebug.ExportedProperty(category = "measurement") 1515 int mMeasuredWidth; 1516 1517 /** 1518 * Height as measured during measure pass. 1519 * {@hide} 1520 */ 1521 @ViewDebug.ExportedProperty(category = "measurement") 1522 int mMeasuredHeight; 1523 1524 /** 1525 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1526 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1527 * its display list. This flag, used only when hw accelerated, allows us to clear the 1528 * flag while retaining this information until it's needed (at getDisplayList() time and 1529 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1530 * 1531 * {@hide} 1532 */ 1533 boolean mRecreateDisplayList = false; 1534 1535 /** 1536 * The view's identifier. 1537 * {@hide} 1538 * 1539 * @see #setId(int) 1540 * @see #getId() 1541 */ 1542 @ViewDebug.ExportedProperty(resolveId = true) 1543 int mID = NO_ID; 1544 1545 /** 1546 * The stable ID of this view for accessibility porposes. 1547 */ 1548 int mAccessibilityViewId = NO_ID; 1549 1550 /** 1551 * The view's tag. 1552 * {@hide} 1553 * 1554 * @see #setTag(Object) 1555 * @see #getTag() 1556 */ 1557 protected Object mTag; 1558 1559 // for mPrivateFlags: 1560 /** {@hide} */ 1561 static final int WANTS_FOCUS = 0x00000001; 1562 /** {@hide} */ 1563 static final int FOCUSED = 0x00000002; 1564 /** {@hide} */ 1565 static final int SELECTED = 0x00000004; 1566 /** {@hide} */ 1567 static final int IS_ROOT_NAMESPACE = 0x00000008; 1568 /** {@hide} */ 1569 static final int HAS_BOUNDS = 0x00000010; 1570 /** {@hide} */ 1571 static final int DRAWN = 0x00000020; 1572 /** 1573 * When this flag is set, this view is running an animation on behalf of its 1574 * children and should therefore not cancel invalidate requests, even if they 1575 * lie outside of this view's bounds. 1576 * 1577 * {@hide} 1578 */ 1579 static final int DRAW_ANIMATION = 0x00000040; 1580 /** {@hide} */ 1581 static final int SKIP_DRAW = 0x00000080; 1582 /** {@hide} */ 1583 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1584 /** {@hide} */ 1585 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1586 /** {@hide} */ 1587 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1588 /** {@hide} */ 1589 static final int MEASURED_DIMENSION_SET = 0x00000800; 1590 /** {@hide} */ 1591 static final int FORCE_LAYOUT = 0x00001000; 1592 /** {@hide} */ 1593 static final int LAYOUT_REQUIRED = 0x00002000; 1594 1595 private static final int PRESSED = 0x00004000; 1596 1597 /** {@hide} */ 1598 static final int DRAWING_CACHE_VALID = 0x00008000; 1599 /** 1600 * Flag used to indicate that this view should be drawn once more (and only once 1601 * more) after its animation has completed. 1602 * {@hide} 1603 */ 1604 static final int ANIMATION_STARTED = 0x00010000; 1605 1606 private static final int SAVE_STATE_CALLED = 0x00020000; 1607 1608 /** 1609 * Indicates that the View returned true when onSetAlpha() was called and that 1610 * the alpha must be restored. 1611 * {@hide} 1612 */ 1613 static final int ALPHA_SET = 0x00040000; 1614 1615 /** 1616 * Set by {@link #setScrollContainer(boolean)}. 1617 */ 1618 static final int SCROLL_CONTAINER = 0x00080000; 1619 1620 /** 1621 * Set by {@link #setScrollContainer(boolean)}. 1622 */ 1623 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1624 1625 /** 1626 * View flag indicating whether this view was invalidated (fully or partially.) 1627 * 1628 * @hide 1629 */ 1630 static final int DIRTY = 0x00200000; 1631 1632 /** 1633 * View flag indicating whether this view was invalidated by an opaque 1634 * invalidate request. 1635 * 1636 * @hide 1637 */ 1638 static final int DIRTY_OPAQUE = 0x00400000; 1639 1640 /** 1641 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1642 * 1643 * @hide 1644 */ 1645 static final int DIRTY_MASK = 0x00600000; 1646 1647 /** 1648 * Indicates whether the background is opaque. 1649 * 1650 * @hide 1651 */ 1652 static final int OPAQUE_BACKGROUND = 0x00800000; 1653 1654 /** 1655 * Indicates whether the scrollbars are opaque. 1656 * 1657 * @hide 1658 */ 1659 static final int OPAQUE_SCROLLBARS = 0x01000000; 1660 1661 /** 1662 * Indicates whether the view is opaque. 1663 * 1664 * @hide 1665 */ 1666 static final int OPAQUE_MASK = 0x01800000; 1667 1668 /** 1669 * Indicates a prepressed state; 1670 * the short time between ACTION_DOWN and recognizing 1671 * a 'real' press. Prepressed is used to recognize quick taps 1672 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1673 * 1674 * @hide 1675 */ 1676 private static final int PREPRESSED = 0x02000000; 1677 1678 /** 1679 * Indicates whether the view is temporarily detached. 1680 * 1681 * @hide 1682 */ 1683 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1684 1685 /** 1686 * Indicates that we should awaken scroll bars once attached 1687 * 1688 * @hide 1689 */ 1690 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1691 1692 /** 1693 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1694 * @hide 1695 */ 1696 private static final int HOVERED = 0x10000000; 1697 1698 /** 1699 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1700 * for transform operations 1701 * 1702 * @hide 1703 */ 1704 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1705 1706 /** {@hide} */ 1707 static final int ACTIVATED = 0x40000000; 1708 1709 /** 1710 * Indicates that this view was specifically invalidated, not just dirtied because some 1711 * child view was invalidated. The flag is used to determine when we need to recreate 1712 * a view's display list (as opposed to just returning a reference to its existing 1713 * display list). 1714 * 1715 * @hide 1716 */ 1717 static final int INVALIDATED = 0x80000000; 1718 1719 /* Masks for mPrivateFlags2 */ 1720 1721 /** 1722 * Indicates that this view has reported that it can accept the current drag's content. 1723 * Cleared when the drag operation concludes. 1724 * @hide 1725 */ 1726 static final int DRAG_CAN_ACCEPT = 0x00000001; 1727 1728 /** 1729 * Indicates that this view is currently directly under the drag location in a 1730 * drag-and-drop operation involving content that it can accept. Cleared when 1731 * the drag exits the view, or when the drag operation concludes. 1732 * @hide 1733 */ 1734 static final int DRAG_HOVERED = 0x00000002; 1735 1736 /** 1737 * Indicates whether the view is drawn in right-to-left direction. 1738 * 1739 * @hide 1740 */ 1741 static final int RESOLVED_LAYOUT_RTL = 0x00000004; 1742 1743 /* End of masks for mPrivateFlags2 */ 1744 1745 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1746 1747 /** 1748 * Always allow a user to over-scroll this view, provided it is a 1749 * view that can scroll. 1750 * 1751 * @see #getOverScrollMode() 1752 * @see #setOverScrollMode(int) 1753 */ 1754 public static final int OVER_SCROLL_ALWAYS = 0; 1755 1756 /** 1757 * Allow a user to over-scroll this view only if the content is large 1758 * enough to meaningfully scroll, provided it is a view that can scroll. 1759 * 1760 * @see #getOverScrollMode() 1761 * @see #setOverScrollMode(int) 1762 */ 1763 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1764 1765 /** 1766 * Never allow a user to over-scroll this view. 1767 * 1768 * @see #getOverScrollMode() 1769 * @see #setOverScrollMode(int) 1770 */ 1771 public static final int OVER_SCROLL_NEVER = 2; 1772 1773 /** 1774 * View has requested the status bar to be visible (the default). 1775 * 1776 * @see #setSystemUiVisibility(int) 1777 */ 1778 public static final int STATUS_BAR_VISIBLE = 0; 1779 1780 /** 1781 * View has requested the status bar to be hidden. 1782 * 1783 * @see #setSystemUiVisibility(int) 1784 */ 1785 public static final int STATUS_BAR_HIDDEN = 0x00000001; 1786 1787 /** 1788 * @hide 1789 * 1790 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1791 * out of the public fields to keep the undefined bits out of the developer's way. 1792 * 1793 * Flag to make the status bar not expandable. Unless you also 1794 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1795 */ 1796 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1797 1798 /** 1799 * @hide 1800 * 1801 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1802 * out of the public fields to keep the undefined bits out of the developer's way. 1803 * 1804 * Flag to hide notification icons and scrolling ticker text. 1805 */ 1806 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1807 1808 /** 1809 * @hide 1810 * 1811 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1812 * out of the public fields to keep the undefined bits out of the developer's way. 1813 * 1814 * Flag to disable incoming notification alerts. This will not block 1815 * icons, but it will block sound, vibrating and other visual or aural notifications. 1816 */ 1817 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1818 1819 /** 1820 * @hide 1821 * 1822 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1823 * out of the public fields to keep the undefined bits out of the developer's way. 1824 * 1825 * Flag to hide only the scrolling ticker. Note that 1826 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1827 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1828 */ 1829 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1830 1831 /** 1832 * @hide 1833 * 1834 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1835 * out of the public fields to keep the undefined bits out of the developer's way. 1836 * 1837 * Flag to hide the center system info area. 1838 */ 1839 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1840 1841 /** 1842 * @hide 1843 * 1844 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1845 * out of the public fields to keep the undefined bits out of the developer's way. 1846 * 1847 * Flag to hide only the navigation buttons. Don't use this 1848 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1849 * 1850 * THIS DOES NOT DISABLE THE BACK BUTTON 1851 */ 1852 public static final int STATUS_BAR_DISABLE_NAVIGATION = 0x00200000; 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 hide only the back button. Don't use this 1861 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1862 */ 1863 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 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 clock. You might use this if your activity has 1872 * its own clock making the status bar's clock redundant. 1873 */ 1874 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1875 1876 /** 1877 * @hide 1878 */ 1879 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = STATUS_BAR_HIDDEN; 1880 1881 /** 1882 * Controls the over-scroll mode for this view. 1883 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1884 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1885 * and {@link #OVER_SCROLL_NEVER}. 1886 */ 1887 private int mOverScrollMode; 1888 1889 /** 1890 * The parent this view is attached to. 1891 * {@hide} 1892 * 1893 * @see #getParent() 1894 */ 1895 protected ViewParent mParent; 1896 1897 /** 1898 * {@hide} 1899 */ 1900 AttachInfo mAttachInfo; 1901 1902 /** 1903 * {@hide} 1904 */ 1905 @ViewDebug.ExportedProperty(flagMapping = { 1906 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1907 name = "FORCE_LAYOUT"), 1908 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1909 name = "LAYOUT_REQUIRED"), 1910 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1911 name = "DRAWING_CACHE_INVALID", outputIf = false), 1912 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1913 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1914 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1915 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1916 }) 1917 int mPrivateFlags; 1918 int mPrivateFlags2; 1919 1920 /** 1921 * This view's request for the visibility of the status bar. 1922 * @hide 1923 */ 1924 @ViewDebug.ExportedProperty() 1925 int mSystemUiVisibility; 1926 1927 /** 1928 * Count of how many windows this view has been attached to. 1929 */ 1930 int mWindowAttachCount; 1931 1932 /** 1933 * The layout parameters associated with this view and used by the parent 1934 * {@link android.view.ViewGroup} to determine how this view should be 1935 * laid out. 1936 * {@hide} 1937 */ 1938 protected ViewGroup.LayoutParams mLayoutParams; 1939 1940 /** 1941 * The view flags hold various views states. 1942 * {@hide} 1943 */ 1944 @ViewDebug.ExportedProperty 1945 int mViewFlags; 1946 1947 /** 1948 * The transform matrix for the View. This transform is calculated internally 1949 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1950 * is used by default. Do *not* use this variable directly; instead call 1951 * getMatrix(), which will automatically recalculate the matrix if necessary 1952 * to get the correct matrix based on the latest rotation and scale properties. 1953 */ 1954 private final Matrix mMatrix = new Matrix(); 1955 1956 /** 1957 * The transform matrix for the View. This transform is calculated internally 1958 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1959 * is used by default. Do *not* use this variable directly; instead call 1960 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1961 * to get the correct matrix based on the latest rotation and scale properties. 1962 */ 1963 private Matrix mInverseMatrix; 1964 1965 /** 1966 * An internal variable that tracks whether we need to recalculate the 1967 * transform matrix, based on whether the rotation or scaleX/Y properties 1968 * have changed since the matrix was last calculated. 1969 */ 1970 boolean mMatrixDirty = false; 1971 1972 /** 1973 * An internal variable that tracks whether we need to recalculate the 1974 * transform matrix, based on whether the rotation or scaleX/Y properties 1975 * have changed since the matrix was last calculated. 1976 */ 1977 private boolean mInverseMatrixDirty = true; 1978 1979 /** 1980 * A variable that tracks whether we need to recalculate the 1981 * transform matrix, based on whether the rotation or scaleX/Y properties 1982 * have changed since the matrix was last calculated. This variable 1983 * is only valid after a call to updateMatrix() or to a function that 1984 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1985 */ 1986 private boolean mMatrixIsIdentity = true; 1987 1988 /** 1989 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1990 */ 1991 private Camera mCamera = null; 1992 1993 /** 1994 * This matrix is used when computing the matrix for 3D rotations. 1995 */ 1996 private Matrix matrix3D = null; 1997 1998 /** 1999 * These prev values are used to recalculate a centered pivot point when necessary. The 2000 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2001 * set), so thes values are only used then as well. 2002 */ 2003 private int mPrevWidth = -1; 2004 private int mPrevHeight = -1; 2005 2006 private boolean mLastIsOpaque; 2007 2008 /** 2009 * Convenience value to check for float values that are close enough to zero to be considered 2010 * zero. 2011 */ 2012 private static final float NONZERO_EPSILON = .001f; 2013 2014 /** 2015 * The degrees rotation around the vertical axis through the pivot point. 2016 */ 2017 @ViewDebug.ExportedProperty 2018 float mRotationY = 0f; 2019 2020 /** 2021 * The degrees rotation around the horizontal axis through the pivot point. 2022 */ 2023 @ViewDebug.ExportedProperty 2024 float mRotationX = 0f; 2025 2026 /** 2027 * The degrees rotation around the pivot point. 2028 */ 2029 @ViewDebug.ExportedProperty 2030 float mRotation = 0f; 2031 2032 /** 2033 * The amount of translation of the object away from its left property (post-layout). 2034 */ 2035 @ViewDebug.ExportedProperty 2036 float mTranslationX = 0f; 2037 2038 /** 2039 * The amount of translation of the object away from its top property (post-layout). 2040 */ 2041 @ViewDebug.ExportedProperty 2042 float mTranslationY = 0f; 2043 2044 /** 2045 * The amount of scale in the x direction around the pivot point. A 2046 * value of 1 means no scaling is applied. 2047 */ 2048 @ViewDebug.ExportedProperty 2049 float mScaleX = 1f; 2050 2051 /** 2052 * The amount of scale in the y direction around the pivot point. A 2053 * value of 1 means no scaling is applied. 2054 */ 2055 @ViewDebug.ExportedProperty 2056 float mScaleY = 1f; 2057 2058 /** 2059 * The amount of scale in the x direction around the pivot point. A 2060 * value of 1 means no scaling is applied. 2061 */ 2062 @ViewDebug.ExportedProperty 2063 float mPivotX = 0f; 2064 2065 /** 2066 * The amount of scale in the y direction around the pivot point. A 2067 * value of 1 means no scaling is applied. 2068 */ 2069 @ViewDebug.ExportedProperty 2070 float mPivotY = 0f; 2071 2072 /** 2073 * The opacity of the View. This is a value from 0 to 1, where 0 means 2074 * completely transparent and 1 means completely opaque. 2075 */ 2076 @ViewDebug.ExportedProperty 2077 float mAlpha = 1f; 2078 2079 /** 2080 * The distance in pixels from the left edge of this view's parent 2081 * to the left edge of this view. 2082 * {@hide} 2083 */ 2084 @ViewDebug.ExportedProperty(category = "layout") 2085 protected int mLeft; 2086 /** 2087 * The distance in pixels from the left edge of this view's parent 2088 * to the right edge of this view. 2089 * {@hide} 2090 */ 2091 @ViewDebug.ExportedProperty(category = "layout") 2092 protected int mRight; 2093 /** 2094 * The distance in pixels from the top edge of this view's parent 2095 * to the top edge of this view. 2096 * {@hide} 2097 */ 2098 @ViewDebug.ExportedProperty(category = "layout") 2099 protected int mTop; 2100 /** 2101 * The distance in pixels from the top edge of this view's parent 2102 * to the bottom edge of this view. 2103 * {@hide} 2104 */ 2105 @ViewDebug.ExportedProperty(category = "layout") 2106 protected int mBottom; 2107 2108 /** 2109 * The offset, in pixels, by which the content of this view is scrolled 2110 * horizontally. 2111 * {@hide} 2112 */ 2113 @ViewDebug.ExportedProperty(category = "scrolling") 2114 protected int mScrollX; 2115 /** 2116 * The offset, in pixels, by which the content of this view is scrolled 2117 * vertically. 2118 * {@hide} 2119 */ 2120 @ViewDebug.ExportedProperty(category = "scrolling") 2121 protected int mScrollY; 2122 2123 /** 2124 * The left padding in pixels, that is the distance in pixels between the 2125 * left edge of this view and the left edge of its content. 2126 * {@hide} 2127 */ 2128 @ViewDebug.ExportedProperty(category = "padding") 2129 protected int mPaddingLeft; 2130 /** 2131 * The right padding in pixels, that is the distance in pixels between the 2132 * right edge of this view and the right edge of its content. 2133 * {@hide} 2134 */ 2135 @ViewDebug.ExportedProperty(category = "padding") 2136 protected int mPaddingRight; 2137 /** 2138 * The top padding in pixels, that is the distance in pixels between the 2139 * top edge of this view and the top edge of its content. 2140 * {@hide} 2141 */ 2142 @ViewDebug.ExportedProperty(category = "padding") 2143 protected int mPaddingTop; 2144 /** 2145 * The bottom padding in pixels, that is the distance in pixels between the 2146 * bottom edge of this view and the bottom edge of its content. 2147 * {@hide} 2148 */ 2149 @ViewDebug.ExportedProperty(category = "padding") 2150 protected int mPaddingBottom; 2151 2152 /** 2153 * Briefly describes the view and is primarily used for accessibility support. 2154 */ 2155 private CharSequence mContentDescription; 2156 2157 /** 2158 * Cache the paddingRight set by the user to append to the scrollbar's size. 2159 */ 2160 @ViewDebug.ExportedProperty(category = "padding") 2161 int mUserPaddingRight; 2162 2163 /** 2164 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2165 */ 2166 @ViewDebug.ExportedProperty(category = "padding") 2167 int mUserPaddingBottom; 2168 2169 /** 2170 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2171 */ 2172 @ViewDebug.ExportedProperty(category = "padding") 2173 int mUserPaddingLeft; 2174 2175 /** 2176 * @hide 2177 */ 2178 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2179 /** 2180 * @hide 2181 */ 2182 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2183 2184 private Resources mResources = null; 2185 2186 private Drawable mBGDrawable; 2187 2188 private int mBackgroundResource; 2189 private boolean mBackgroundSizeChanged; 2190 2191 /** 2192 * Listener used to dispatch focus change events. 2193 * This field should be made private, so it is hidden from the SDK. 2194 * {@hide} 2195 */ 2196 protected OnFocusChangeListener mOnFocusChangeListener; 2197 2198 /** 2199 * Listeners for layout change events. 2200 */ 2201 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2202 2203 /** 2204 * Listeners for attach events. 2205 */ 2206 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2207 2208 /** 2209 * Listener used to dispatch click events. 2210 * This field should be made private, so it is hidden from the SDK. 2211 * {@hide} 2212 */ 2213 protected OnClickListener mOnClickListener; 2214 2215 /** 2216 * Listener used to dispatch long click events. 2217 * This field should be made private, so it is hidden from the SDK. 2218 * {@hide} 2219 */ 2220 protected OnLongClickListener mOnLongClickListener; 2221 2222 /** 2223 * Listener used to build the context menu. 2224 * This field should be made private, so it is hidden from the SDK. 2225 * {@hide} 2226 */ 2227 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2228 2229 private OnKeyListener mOnKeyListener; 2230 2231 private OnTouchListener mOnTouchListener; 2232 2233 private OnGenericMotionListener mOnGenericMotionListener; 2234 2235 private OnDragListener mOnDragListener; 2236 2237 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2238 2239 /** 2240 * The application environment this view lives in. 2241 * This field should be made private, so it is hidden from the SDK. 2242 * {@hide} 2243 */ 2244 protected Context mContext; 2245 2246 private ScrollabilityCache mScrollCache; 2247 2248 private int[] mDrawableState = null; 2249 2250 /** 2251 * Set to true when drawing cache is enabled and cannot be created. 2252 * 2253 * @hide 2254 */ 2255 public boolean mCachingFailed; 2256 2257 private Bitmap mDrawingCache; 2258 private Bitmap mUnscaledDrawingCache; 2259 private DisplayList mDisplayList; 2260 private HardwareLayer mHardwareLayer; 2261 2262 /** 2263 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2264 * the user may specify which view to go to next. 2265 */ 2266 private int mNextFocusLeftId = View.NO_ID; 2267 2268 /** 2269 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2270 * the user may specify which view to go to next. 2271 */ 2272 private int mNextFocusRightId = View.NO_ID; 2273 2274 /** 2275 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2276 * the user may specify which view to go to next. 2277 */ 2278 private int mNextFocusUpId = View.NO_ID; 2279 2280 /** 2281 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2282 * the user may specify which view to go to next. 2283 */ 2284 private int mNextFocusDownId = View.NO_ID; 2285 2286 /** 2287 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2288 * the user may specify which view to go to next. 2289 */ 2290 int mNextFocusForwardId = View.NO_ID; 2291 2292 private CheckForLongPress mPendingCheckForLongPress; 2293 private CheckForTap mPendingCheckForTap = null; 2294 private PerformClick mPerformClick; 2295 2296 private UnsetPressedState mUnsetPressedState; 2297 2298 /** 2299 * Whether the long press's action has been invoked. The tap's action is invoked on the 2300 * up event while a long press is invoked as soon as the long press duration is reached, so 2301 * a long press could be performed before the tap is checked, in which case the tap's action 2302 * should not be invoked. 2303 */ 2304 private boolean mHasPerformedLongPress; 2305 2306 /** 2307 * The minimum height of the view. We'll try our best to have the height 2308 * of this view to at least this amount. 2309 */ 2310 @ViewDebug.ExportedProperty(category = "measurement") 2311 private int mMinHeight; 2312 2313 /** 2314 * The minimum width of the view. We'll try our best to have the width 2315 * of this view to at least this amount. 2316 */ 2317 @ViewDebug.ExportedProperty(category = "measurement") 2318 private int mMinWidth; 2319 2320 /** 2321 * The delegate to handle touch events that are physically in this view 2322 * but should be handled by another view. 2323 */ 2324 private TouchDelegate mTouchDelegate = null; 2325 2326 /** 2327 * Solid color to use as a background when creating the drawing cache. Enables 2328 * the cache to use 16 bit bitmaps instead of 32 bit. 2329 */ 2330 private int mDrawingCacheBackgroundColor = 0; 2331 2332 /** 2333 * Special tree observer used when mAttachInfo is null. 2334 */ 2335 private ViewTreeObserver mFloatingTreeObserver; 2336 2337 /** 2338 * Cache the touch slop from the context that created the view. 2339 */ 2340 private int mTouchSlop; 2341 2342 /** 2343 * Object that handles automatic animation of view properties. 2344 */ 2345 private ViewPropertyAnimator mAnimator = null; 2346 2347 /** 2348 * Flag indicating that a drag can cross window boundaries. When 2349 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2350 * with this flag set, all visible applications will be able to participate 2351 * in the drag operation and receive the dragged content. 2352 * 2353 * @hide 2354 */ 2355 public static final int DRAG_FLAG_GLOBAL = 1; 2356 2357 /** 2358 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2359 */ 2360 private float mVerticalScrollFactor; 2361 2362 /** 2363 * Position of the vertical scroll bar. 2364 */ 2365 private int mVerticalScrollbarPosition; 2366 2367 /** 2368 * Position the scroll bar at the default position as determined by the system. 2369 */ 2370 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2371 2372 /** 2373 * Position the scroll bar along the left edge. 2374 */ 2375 public static final int SCROLLBAR_POSITION_LEFT = 1; 2376 2377 /** 2378 * Position the scroll bar along the right edge. 2379 */ 2380 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2381 2382 /** 2383 * Indicates that the view does not have a layer. 2384 * 2385 * @see #getLayerType() 2386 * @see #setLayerType(int, android.graphics.Paint) 2387 * @see #LAYER_TYPE_SOFTWARE 2388 * @see #LAYER_TYPE_HARDWARE 2389 */ 2390 public static final int LAYER_TYPE_NONE = 0; 2391 2392 /** 2393 * <p>Indicates that the view has a software layer. A software layer is backed 2394 * by a bitmap and causes the view to be rendered using Android's software 2395 * rendering pipeline, even if hardware acceleration is enabled.</p> 2396 * 2397 * <p>Software layers have various usages:</p> 2398 * <p>When the application is not using hardware acceleration, a software layer 2399 * is useful to apply a specific color filter and/or blending mode and/or 2400 * translucency to a view and all its children.</p> 2401 * <p>When the application is using hardware acceleration, a software layer 2402 * is useful to render drawing primitives not supported by the hardware 2403 * accelerated pipeline. It can also be used to cache a complex view tree 2404 * into a texture and reduce the complexity of drawing operations. For instance, 2405 * when animating a complex view tree with a translation, a software layer can 2406 * be used to render the view tree only once.</p> 2407 * <p>Software layers should be avoided when the affected view tree updates 2408 * often. Every update will require to re-render the software layer, which can 2409 * potentially be slow (particularly when hardware acceleration is turned on 2410 * since the layer will have to be uploaded into a hardware texture after every 2411 * update.)</p> 2412 * 2413 * @see #getLayerType() 2414 * @see #setLayerType(int, android.graphics.Paint) 2415 * @see #LAYER_TYPE_NONE 2416 * @see #LAYER_TYPE_HARDWARE 2417 */ 2418 public static final int LAYER_TYPE_SOFTWARE = 1; 2419 2420 /** 2421 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2422 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2423 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2424 * rendering pipeline, but only if hardware acceleration is turned on for the 2425 * view hierarchy. When hardware acceleration is turned off, hardware layers 2426 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2427 * 2428 * <p>A hardware layer is useful to apply a specific color filter and/or 2429 * blending mode and/or translucency to a view and all its children.</p> 2430 * <p>A hardware layer can be used to cache a complex view tree into a 2431 * texture and reduce the complexity of drawing operations. For instance, 2432 * when animating a complex view tree with a translation, a hardware layer can 2433 * be used to render the view tree only once.</p> 2434 * <p>A hardware layer can also be used to increase the rendering quality when 2435 * rotation transformations are applied on a view. It can also be used to 2436 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2437 * 2438 * @see #getLayerType() 2439 * @see #setLayerType(int, android.graphics.Paint) 2440 * @see #LAYER_TYPE_NONE 2441 * @see #LAYER_TYPE_SOFTWARE 2442 */ 2443 public static final int LAYER_TYPE_HARDWARE = 2; 2444 2445 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2446 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2447 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2448 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2449 }) 2450 int mLayerType = LAYER_TYPE_NONE; 2451 Paint mLayerPaint; 2452 Rect mLocalDirtyRect; 2453 2454 /** 2455 * Consistency verifier for debugging purposes. 2456 * @hide 2457 */ 2458 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2459 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2460 new InputEventConsistencyVerifier(this, 0) : null; 2461 2462 /** 2463 * Simple constructor to use when creating a view from code. 2464 * 2465 * @param context The Context the view is running in, through which it can 2466 * access the current theme, resources, etc. 2467 */ 2468 public View(Context context) { 2469 mContext = context; 2470 mResources = context != null ? context.getResources() : null; 2471 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT; 2472 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2473 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2474 } 2475 2476 /** 2477 * Constructor that is called when inflating a view from XML. This is called 2478 * when a view is being constructed from an XML file, supplying attributes 2479 * that were specified in the XML file. This version uses a default style of 2480 * 0, so the only attribute values applied are those in the Context's Theme 2481 * and the given AttributeSet. 2482 * 2483 * <p> 2484 * The method onFinishInflate() will be called after all children have been 2485 * added. 2486 * 2487 * @param context The Context the view is running in, through which it can 2488 * access the current theme, resources, etc. 2489 * @param attrs The attributes of the XML tag that is inflating the view. 2490 * @see #View(Context, AttributeSet, int) 2491 */ 2492 public View(Context context, AttributeSet attrs) { 2493 this(context, attrs, 0); 2494 } 2495 2496 /** 2497 * Perform inflation from XML and apply a class-specific base style. This 2498 * constructor of View allows subclasses to use their own base style when 2499 * they are inflating. For example, a Button class's constructor would call 2500 * this version of the super class constructor and supply 2501 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2502 * the theme's button style to modify all of the base view attributes (in 2503 * particular its background) as well as the Button class's attributes. 2504 * 2505 * @param context The Context the view is running in, through which it can 2506 * access the current theme, resources, etc. 2507 * @param attrs The attributes of the XML tag that is inflating the view. 2508 * @param defStyle The default style to apply to this view. If 0, no style 2509 * will be applied (beyond what is included in the theme). This may 2510 * either be an attribute resource, whose value will be retrieved 2511 * from the current theme, or an explicit style resource. 2512 * @see #View(Context, AttributeSet) 2513 */ 2514 public View(Context context, AttributeSet attrs, int defStyle) { 2515 this(context); 2516 2517 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2518 defStyle, 0); 2519 2520 Drawable background = null; 2521 2522 int leftPadding = -1; 2523 int topPadding = -1; 2524 int rightPadding = -1; 2525 int bottomPadding = -1; 2526 2527 int padding = -1; 2528 2529 int viewFlagValues = 0; 2530 int viewFlagMasks = 0; 2531 2532 boolean setScrollContainer = false; 2533 2534 int x = 0; 2535 int y = 0; 2536 2537 float tx = 0; 2538 float ty = 0; 2539 float rotation = 0; 2540 float rotationX = 0; 2541 float rotationY = 0; 2542 float sx = 1f; 2543 float sy = 1f; 2544 boolean transformSet = false; 2545 2546 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2547 2548 int overScrollMode = mOverScrollMode; 2549 final int N = a.getIndexCount(); 2550 for (int i = 0; i < N; i++) { 2551 int attr = a.getIndex(i); 2552 switch (attr) { 2553 case com.android.internal.R.styleable.View_background: 2554 background = a.getDrawable(attr); 2555 break; 2556 case com.android.internal.R.styleable.View_padding: 2557 padding = a.getDimensionPixelSize(attr, -1); 2558 break; 2559 case com.android.internal.R.styleable.View_paddingLeft: 2560 leftPadding = a.getDimensionPixelSize(attr, -1); 2561 break; 2562 case com.android.internal.R.styleable.View_paddingTop: 2563 topPadding = a.getDimensionPixelSize(attr, -1); 2564 break; 2565 case com.android.internal.R.styleable.View_paddingRight: 2566 rightPadding = a.getDimensionPixelSize(attr, -1); 2567 break; 2568 case com.android.internal.R.styleable.View_paddingBottom: 2569 bottomPadding = a.getDimensionPixelSize(attr, -1); 2570 break; 2571 case com.android.internal.R.styleable.View_scrollX: 2572 x = a.getDimensionPixelOffset(attr, 0); 2573 break; 2574 case com.android.internal.R.styleable.View_scrollY: 2575 y = a.getDimensionPixelOffset(attr, 0); 2576 break; 2577 case com.android.internal.R.styleable.View_alpha: 2578 setAlpha(a.getFloat(attr, 1f)); 2579 break; 2580 case com.android.internal.R.styleable.View_transformPivotX: 2581 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2582 break; 2583 case com.android.internal.R.styleable.View_transformPivotY: 2584 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2585 break; 2586 case com.android.internal.R.styleable.View_translationX: 2587 tx = a.getDimensionPixelOffset(attr, 0); 2588 transformSet = true; 2589 break; 2590 case com.android.internal.R.styleable.View_translationY: 2591 ty = a.getDimensionPixelOffset(attr, 0); 2592 transformSet = true; 2593 break; 2594 case com.android.internal.R.styleable.View_rotation: 2595 rotation = a.getFloat(attr, 0); 2596 transformSet = true; 2597 break; 2598 case com.android.internal.R.styleable.View_rotationX: 2599 rotationX = a.getFloat(attr, 0); 2600 transformSet = true; 2601 break; 2602 case com.android.internal.R.styleable.View_rotationY: 2603 rotationY = a.getFloat(attr, 0); 2604 transformSet = true; 2605 break; 2606 case com.android.internal.R.styleable.View_scaleX: 2607 sx = a.getFloat(attr, 1f); 2608 transformSet = true; 2609 break; 2610 case com.android.internal.R.styleable.View_scaleY: 2611 sy = a.getFloat(attr, 1f); 2612 transformSet = true; 2613 break; 2614 case com.android.internal.R.styleable.View_id: 2615 mID = a.getResourceId(attr, NO_ID); 2616 break; 2617 case com.android.internal.R.styleable.View_tag: 2618 mTag = a.getText(attr); 2619 break; 2620 case com.android.internal.R.styleable.View_fitsSystemWindows: 2621 if (a.getBoolean(attr, false)) { 2622 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2623 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2624 } 2625 break; 2626 case com.android.internal.R.styleable.View_focusable: 2627 if (a.getBoolean(attr, false)) { 2628 viewFlagValues |= FOCUSABLE; 2629 viewFlagMasks |= FOCUSABLE_MASK; 2630 } 2631 break; 2632 case com.android.internal.R.styleable.View_focusableInTouchMode: 2633 if (a.getBoolean(attr, false)) { 2634 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2635 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2636 } 2637 break; 2638 case com.android.internal.R.styleable.View_clickable: 2639 if (a.getBoolean(attr, false)) { 2640 viewFlagValues |= CLICKABLE; 2641 viewFlagMasks |= CLICKABLE; 2642 } 2643 break; 2644 case com.android.internal.R.styleable.View_longClickable: 2645 if (a.getBoolean(attr, false)) { 2646 viewFlagValues |= LONG_CLICKABLE; 2647 viewFlagMasks |= LONG_CLICKABLE; 2648 } 2649 break; 2650 case com.android.internal.R.styleable.View_saveEnabled: 2651 if (!a.getBoolean(attr, true)) { 2652 viewFlagValues |= SAVE_DISABLED; 2653 viewFlagMasks |= SAVE_DISABLED_MASK; 2654 } 2655 break; 2656 case com.android.internal.R.styleable.View_duplicateParentState: 2657 if (a.getBoolean(attr, false)) { 2658 viewFlagValues |= DUPLICATE_PARENT_STATE; 2659 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2660 } 2661 break; 2662 case com.android.internal.R.styleable.View_visibility: 2663 final int visibility = a.getInt(attr, 0); 2664 if (visibility != 0) { 2665 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2666 viewFlagMasks |= VISIBILITY_MASK; 2667 } 2668 break; 2669 case com.android.internal.R.styleable.View_layoutDirection: 2670 // Clear any HORIZONTAL_DIRECTION flag already set 2671 viewFlagValues &= ~LAYOUT_DIRECTION_MASK; 2672 // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute 2673 final int layoutDirection = a.getInt(attr, -1); 2674 if (layoutDirection != -1) { 2675 viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection]; 2676 } else { 2677 // Set to default (LAYOUT_DIRECTION_INHERIT) 2678 viewFlagValues |= LAYOUT_DIRECTION_DEFAULT; 2679 } 2680 viewFlagMasks |= LAYOUT_DIRECTION_MASK; 2681 break; 2682 case com.android.internal.R.styleable.View_drawingCacheQuality: 2683 final int cacheQuality = a.getInt(attr, 0); 2684 if (cacheQuality != 0) { 2685 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2686 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2687 } 2688 break; 2689 case com.android.internal.R.styleable.View_contentDescription: 2690 mContentDescription = a.getString(attr); 2691 break; 2692 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2693 if (!a.getBoolean(attr, true)) { 2694 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2695 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2696 } 2697 break; 2698 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2699 if (!a.getBoolean(attr, true)) { 2700 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2701 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2702 } 2703 break; 2704 case R.styleable.View_scrollbars: 2705 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2706 if (scrollbars != SCROLLBARS_NONE) { 2707 viewFlagValues |= scrollbars; 2708 viewFlagMasks |= SCROLLBARS_MASK; 2709 initializeScrollbars(a); 2710 } 2711 break; 2712 case R.styleable.View_fadingEdge: 2713 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2714 if (fadingEdge != FADING_EDGE_NONE) { 2715 viewFlagValues |= fadingEdge; 2716 viewFlagMasks |= FADING_EDGE_MASK; 2717 initializeFadingEdge(a); 2718 } 2719 break; 2720 case R.styleable.View_scrollbarStyle: 2721 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2722 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2723 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2724 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2725 } 2726 break; 2727 case R.styleable.View_isScrollContainer: 2728 setScrollContainer = true; 2729 if (a.getBoolean(attr, false)) { 2730 setScrollContainer(true); 2731 } 2732 break; 2733 case com.android.internal.R.styleable.View_keepScreenOn: 2734 if (a.getBoolean(attr, false)) { 2735 viewFlagValues |= KEEP_SCREEN_ON; 2736 viewFlagMasks |= KEEP_SCREEN_ON; 2737 } 2738 break; 2739 case R.styleable.View_filterTouchesWhenObscured: 2740 if (a.getBoolean(attr, false)) { 2741 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2742 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2743 } 2744 break; 2745 case R.styleable.View_nextFocusLeft: 2746 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2747 break; 2748 case R.styleable.View_nextFocusRight: 2749 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2750 break; 2751 case R.styleable.View_nextFocusUp: 2752 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2753 break; 2754 case R.styleable.View_nextFocusDown: 2755 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2756 break; 2757 case R.styleable.View_nextFocusForward: 2758 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2759 break; 2760 case R.styleable.View_minWidth: 2761 mMinWidth = a.getDimensionPixelSize(attr, 0); 2762 break; 2763 case R.styleable.View_minHeight: 2764 mMinHeight = a.getDimensionPixelSize(attr, 0); 2765 break; 2766 case R.styleable.View_onClick: 2767 if (context.isRestricted()) { 2768 throw new IllegalStateException("The android:onClick attribute cannot " 2769 + "be used within a restricted context"); 2770 } 2771 2772 final String handlerName = a.getString(attr); 2773 if (handlerName != null) { 2774 setOnClickListener(new OnClickListener() { 2775 private Method mHandler; 2776 2777 public void onClick(View v) { 2778 if (mHandler == null) { 2779 try { 2780 mHandler = getContext().getClass().getMethod(handlerName, 2781 View.class); 2782 } catch (NoSuchMethodException e) { 2783 int id = getId(); 2784 String idText = id == NO_ID ? "" : " with id '" 2785 + getContext().getResources().getResourceEntryName( 2786 id) + "'"; 2787 throw new IllegalStateException("Could not find a method " + 2788 handlerName + "(View) in the activity " 2789 + getContext().getClass() + " for onClick handler" 2790 + " on view " + View.this.getClass() + idText, e); 2791 } 2792 } 2793 2794 try { 2795 mHandler.invoke(getContext(), View.this); 2796 } catch (IllegalAccessException e) { 2797 throw new IllegalStateException("Could not execute non " 2798 + "public method of the activity", e); 2799 } catch (InvocationTargetException e) { 2800 throw new IllegalStateException("Could not execute " 2801 + "method of the activity", e); 2802 } 2803 } 2804 }); 2805 } 2806 break; 2807 case R.styleable.View_overScrollMode: 2808 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2809 break; 2810 case R.styleable.View_verticalScrollbarPosition: 2811 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2812 break; 2813 case R.styleable.View_layerType: 2814 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2815 break; 2816 } 2817 } 2818 2819 setOverScrollMode(overScrollMode); 2820 2821 if (background != null) { 2822 setBackgroundDrawable(background); 2823 } 2824 2825 if (padding >= 0) { 2826 leftPadding = padding; 2827 topPadding = padding; 2828 rightPadding = padding; 2829 bottomPadding = padding; 2830 } 2831 2832 // If the user specified the padding (either with android:padding or 2833 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2834 // use the default padding or the padding from the background drawable 2835 // (stored at this point in mPadding*) 2836 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2837 topPadding >= 0 ? topPadding : mPaddingTop, 2838 rightPadding >= 0 ? rightPadding : mPaddingRight, 2839 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2840 2841 if (viewFlagMasks != 0) { 2842 setFlags(viewFlagValues, viewFlagMasks); 2843 } 2844 2845 // Needs to be called after mViewFlags is set 2846 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2847 recomputePadding(); 2848 } 2849 2850 if (x != 0 || y != 0) { 2851 scrollTo(x, y); 2852 } 2853 2854 if (transformSet) { 2855 setTranslationX(tx); 2856 setTranslationY(ty); 2857 setRotation(rotation); 2858 setRotationX(rotationX); 2859 setRotationY(rotationY); 2860 setScaleX(sx); 2861 setScaleY(sy); 2862 } 2863 2864 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2865 setScrollContainer(true); 2866 } 2867 2868 computeOpaqueFlags(); 2869 2870 a.recycle(); 2871 } 2872 2873 /** 2874 * Non-public constructor for use in testing 2875 */ 2876 View() { 2877 } 2878 2879 /** 2880 * <p> 2881 * Initializes the fading edges from a given set of styled attributes. This 2882 * method should be called by subclasses that need fading edges and when an 2883 * instance of these subclasses is created programmatically rather than 2884 * being inflated from XML. This method is automatically called when the XML 2885 * is inflated. 2886 * </p> 2887 * 2888 * @param a the styled attributes set to initialize the fading edges from 2889 */ 2890 protected void initializeFadingEdge(TypedArray a) { 2891 initScrollCache(); 2892 2893 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2894 R.styleable.View_fadingEdgeLength, 2895 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2896 } 2897 2898 /** 2899 * Returns the size of the vertical faded edges used to indicate that more 2900 * content in this view is visible. 2901 * 2902 * @return The size in pixels of the vertical faded edge or 0 if vertical 2903 * faded edges are not enabled for this view. 2904 * @attr ref android.R.styleable#View_fadingEdgeLength 2905 */ 2906 public int getVerticalFadingEdgeLength() { 2907 if (isVerticalFadingEdgeEnabled()) { 2908 ScrollabilityCache cache = mScrollCache; 2909 if (cache != null) { 2910 return cache.fadingEdgeLength; 2911 } 2912 } 2913 return 0; 2914 } 2915 2916 /** 2917 * Set the size of the faded edge used to indicate that more content in this 2918 * view is available. Will not change whether the fading edge is enabled; use 2919 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 2920 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 2921 * for the vertical or horizontal fading edges. 2922 * 2923 * @param length The size in pixels of the faded edge used to indicate that more 2924 * content in this view is visible. 2925 */ 2926 public void setFadingEdgeLength(int length) { 2927 initScrollCache(); 2928 mScrollCache.fadingEdgeLength = length; 2929 } 2930 2931 /** 2932 * Returns the size of the horizontal faded edges used to indicate that more 2933 * content in this view is visible. 2934 * 2935 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2936 * faded edges are not enabled for this view. 2937 * @attr ref android.R.styleable#View_fadingEdgeLength 2938 */ 2939 public int getHorizontalFadingEdgeLength() { 2940 if (isHorizontalFadingEdgeEnabled()) { 2941 ScrollabilityCache cache = mScrollCache; 2942 if (cache != null) { 2943 return cache.fadingEdgeLength; 2944 } 2945 } 2946 return 0; 2947 } 2948 2949 /** 2950 * Returns the width of the vertical scrollbar. 2951 * 2952 * @return The width in pixels of the vertical scrollbar or 0 if there 2953 * is no vertical scrollbar. 2954 */ 2955 public int getVerticalScrollbarWidth() { 2956 ScrollabilityCache cache = mScrollCache; 2957 if (cache != null) { 2958 ScrollBarDrawable scrollBar = cache.scrollBar; 2959 if (scrollBar != null) { 2960 int size = scrollBar.getSize(true); 2961 if (size <= 0) { 2962 size = cache.scrollBarSize; 2963 } 2964 return size; 2965 } 2966 return 0; 2967 } 2968 return 0; 2969 } 2970 2971 /** 2972 * Returns the height of the horizontal scrollbar. 2973 * 2974 * @return The height in pixels of the horizontal scrollbar or 0 if 2975 * there is no horizontal scrollbar. 2976 */ 2977 protected int getHorizontalScrollbarHeight() { 2978 ScrollabilityCache cache = mScrollCache; 2979 if (cache != null) { 2980 ScrollBarDrawable scrollBar = cache.scrollBar; 2981 if (scrollBar != null) { 2982 int size = scrollBar.getSize(false); 2983 if (size <= 0) { 2984 size = cache.scrollBarSize; 2985 } 2986 return size; 2987 } 2988 return 0; 2989 } 2990 return 0; 2991 } 2992 2993 /** 2994 * <p> 2995 * Initializes the scrollbars from a given set of styled attributes. This 2996 * method should be called by subclasses that need scrollbars and when an 2997 * instance of these subclasses is created programmatically rather than 2998 * being inflated from XML. This method is automatically called when the XML 2999 * is inflated. 3000 * </p> 3001 * 3002 * @param a the styled attributes set to initialize the scrollbars from 3003 */ 3004 protected void initializeScrollbars(TypedArray a) { 3005 initScrollCache(); 3006 3007 final ScrollabilityCache scrollabilityCache = mScrollCache; 3008 3009 if (scrollabilityCache.scrollBar == null) { 3010 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3011 } 3012 3013 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3014 3015 if (!fadeScrollbars) { 3016 scrollabilityCache.state = ScrollabilityCache.ON; 3017 } 3018 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3019 3020 3021 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3022 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3023 .getScrollBarFadeDuration()); 3024 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3025 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3026 ViewConfiguration.getScrollDefaultDelay()); 3027 3028 3029 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3030 com.android.internal.R.styleable.View_scrollbarSize, 3031 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3032 3033 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3034 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3035 3036 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3037 if (thumb != null) { 3038 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3039 } 3040 3041 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3042 false); 3043 if (alwaysDraw) { 3044 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3045 } 3046 3047 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3048 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3049 3050 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3051 if (thumb != null) { 3052 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3053 } 3054 3055 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3056 false); 3057 if (alwaysDraw) { 3058 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3059 } 3060 3061 // Re-apply user/background padding so that scrollbar(s) get added 3062 recomputePadding(); 3063 } 3064 3065 /** 3066 * <p> 3067 * Initalizes the scrollability cache if necessary. 3068 * </p> 3069 */ 3070 private void initScrollCache() { 3071 if (mScrollCache == null) { 3072 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3073 } 3074 } 3075 3076 /** 3077 * Set the position of the vertical scroll bar. Should be one of 3078 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3079 * {@link #SCROLLBAR_POSITION_RIGHT}. 3080 * 3081 * @param position Where the vertical scroll bar should be positioned. 3082 */ 3083 public void setVerticalScrollbarPosition(int position) { 3084 if (mVerticalScrollbarPosition != position) { 3085 mVerticalScrollbarPosition = position; 3086 computeOpaqueFlags(); 3087 recomputePadding(); 3088 } 3089 } 3090 3091 /** 3092 * @return The position where the vertical scroll bar will show, if applicable. 3093 * @see #setVerticalScrollbarPosition(int) 3094 */ 3095 public int getVerticalScrollbarPosition() { 3096 return mVerticalScrollbarPosition; 3097 } 3098 3099 /** 3100 * Register a callback to be invoked when focus of this view changed. 3101 * 3102 * @param l The callback that will run. 3103 */ 3104 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3105 mOnFocusChangeListener = l; 3106 } 3107 3108 /** 3109 * Add a listener that will be called when the bounds of the view change due to 3110 * layout processing. 3111 * 3112 * @param listener The listener that will be called when layout bounds change. 3113 */ 3114 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3115 if (mOnLayoutChangeListeners == null) { 3116 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3117 } 3118 mOnLayoutChangeListeners.add(listener); 3119 } 3120 3121 /** 3122 * Remove a listener for layout changes. 3123 * 3124 * @param listener The listener for layout bounds change. 3125 */ 3126 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3127 if (mOnLayoutChangeListeners == null) { 3128 return; 3129 } 3130 mOnLayoutChangeListeners.remove(listener); 3131 } 3132 3133 /** 3134 * Add a listener for attach state changes. 3135 * 3136 * This listener will be called whenever this view is attached or detached 3137 * from a window. Remove the listener using 3138 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3139 * 3140 * @param listener Listener to attach 3141 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3142 */ 3143 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3144 if (mOnAttachStateChangeListeners == null) { 3145 mOnAttachStateChangeListeners = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3146 } 3147 mOnAttachStateChangeListeners.add(listener); 3148 } 3149 3150 /** 3151 * Remove a listener for attach state changes. The listener will receive no further 3152 * notification of window attach/detach events. 3153 * 3154 * @param listener Listener to remove 3155 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3156 */ 3157 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3158 if (mOnAttachStateChangeListeners == null) { 3159 return; 3160 } 3161 mOnAttachStateChangeListeners.remove(listener); 3162 } 3163 3164 /** 3165 * Returns the focus-change callback registered for this view. 3166 * 3167 * @return The callback, or null if one is not registered. 3168 */ 3169 public OnFocusChangeListener getOnFocusChangeListener() { 3170 return mOnFocusChangeListener; 3171 } 3172 3173 /** 3174 * Register a callback to be invoked when this view is clicked. If this view is not 3175 * clickable, it becomes clickable. 3176 * 3177 * @param l The callback that will run 3178 * 3179 * @see #setClickable(boolean) 3180 */ 3181 public void setOnClickListener(OnClickListener l) { 3182 if (!isClickable()) { 3183 setClickable(true); 3184 } 3185 mOnClickListener = l; 3186 } 3187 3188 /** 3189 * Register a callback to be invoked when this view is clicked and held. If this view is not 3190 * long clickable, it becomes long clickable. 3191 * 3192 * @param l The callback that will run 3193 * 3194 * @see #setLongClickable(boolean) 3195 */ 3196 public void setOnLongClickListener(OnLongClickListener l) { 3197 if (!isLongClickable()) { 3198 setLongClickable(true); 3199 } 3200 mOnLongClickListener = l; 3201 } 3202 3203 /** 3204 * Register a callback to be invoked when the context menu for this view is 3205 * being built. If this view is not long clickable, it becomes long clickable. 3206 * 3207 * @param l The callback that will run 3208 * 3209 */ 3210 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3211 if (!isLongClickable()) { 3212 setLongClickable(true); 3213 } 3214 mOnCreateContextMenuListener = l; 3215 } 3216 3217 /** 3218 * Call this view's OnClickListener, if it is defined. 3219 * 3220 * @return True there was an assigned OnClickListener that was called, false 3221 * otherwise is returned. 3222 */ 3223 public boolean performClick() { 3224 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3225 3226 if (mOnClickListener != null) { 3227 playSoundEffect(SoundEffectConstants.CLICK); 3228 mOnClickListener.onClick(this); 3229 return true; 3230 } 3231 3232 return false; 3233 } 3234 3235 /** 3236 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3237 * OnLongClickListener did not consume the event. 3238 * 3239 * @return True if one of the above receivers consumed the event, false otherwise. 3240 */ 3241 public boolean performLongClick() { 3242 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3243 3244 boolean handled = false; 3245 if (mOnLongClickListener != null) { 3246 handled = mOnLongClickListener.onLongClick(View.this); 3247 } 3248 if (!handled) { 3249 handled = showContextMenu(); 3250 } 3251 if (handled) { 3252 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3253 } 3254 return handled; 3255 } 3256 3257 /** 3258 * Performs button-related actions during a touch down event. 3259 * 3260 * @param event The event. 3261 * @return True if the down was consumed. 3262 * 3263 * @hide 3264 */ 3265 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3266 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3267 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3268 return true; 3269 } 3270 } 3271 return false; 3272 } 3273 3274 /** 3275 * Bring up the context menu for this view. 3276 * 3277 * @return Whether a context menu was displayed. 3278 */ 3279 public boolean showContextMenu() { 3280 return getParent().showContextMenuForChild(this); 3281 } 3282 3283 /** 3284 * Bring up the context menu for this view, referring to the item under the specified point. 3285 * 3286 * @param x The referenced x coordinate. 3287 * @param y The referenced y coordinate. 3288 * @param metaState The keyboard modifiers that were pressed. 3289 * @return Whether a context menu was displayed. 3290 * 3291 * @hide 3292 */ 3293 public boolean showContextMenu(float x, float y, int metaState) { 3294 return showContextMenu(); 3295 } 3296 3297 /** 3298 * Start an action mode. 3299 * 3300 * @param callback Callback that will control the lifecycle of the action mode 3301 * @return The new action mode if it is started, null otherwise 3302 * 3303 * @see ActionMode 3304 */ 3305 public ActionMode startActionMode(ActionMode.Callback callback) { 3306 return getParent().startActionModeForChild(this, callback); 3307 } 3308 3309 /** 3310 * Register a callback to be invoked when a key is pressed in this view. 3311 * @param l the key listener to attach to this view 3312 */ 3313 public void setOnKeyListener(OnKeyListener l) { 3314 mOnKeyListener = l; 3315 } 3316 3317 /** 3318 * Register a callback to be invoked when a touch event is sent to this view. 3319 * @param l the touch listener to attach to this view 3320 */ 3321 public void setOnTouchListener(OnTouchListener l) { 3322 mOnTouchListener = l; 3323 } 3324 3325 /** 3326 * Register a callback to be invoked when a generic motion event is sent to this view. 3327 * @param l the generic motion listener to attach to this view 3328 */ 3329 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3330 mOnGenericMotionListener = l; 3331 } 3332 3333 /** 3334 * Register a drag event listener callback object for this View. The parameter is 3335 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3336 * View, the system calls the 3337 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3338 * @param l An implementation of {@link android.view.View.OnDragListener}. 3339 */ 3340 public void setOnDragListener(OnDragListener l) { 3341 mOnDragListener = l; 3342 } 3343 3344 /** 3345 * Give this view focus. This will cause 3346 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3347 * 3348 * Note: this does not check whether this {@link View} should get focus, it just 3349 * gives it focus no matter what. It should only be called internally by framework 3350 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3351 * 3352 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3353 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3354 * focus moved when requestFocus() is called. It may not always 3355 * apply, in which case use the default View.FOCUS_DOWN. 3356 * @param previouslyFocusedRect The rectangle of the view that had focus 3357 * prior in this View's coordinate system. 3358 */ 3359 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3360 if (DBG) { 3361 System.out.println(this + " requestFocus()"); 3362 } 3363 3364 if ((mPrivateFlags & FOCUSED) == 0) { 3365 mPrivateFlags |= FOCUSED; 3366 3367 if (mParent != null) { 3368 mParent.requestChildFocus(this, this); 3369 } 3370 3371 onFocusChanged(true, direction, previouslyFocusedRect); 3372 refreshDrawableState(); 3373 } 3374 } 3375 3376 /** 3377 * Request that a rectangle of this view be visible on the screen, 3378 * scrolling if necessary just enough. 3379 * 3380 * <p>A View should call this if it maintains some notion of which part 3381 * of its content is interesting. For example, a text editing view 3382 * should call this when its cursor moves. 3383 * 3384 * @param rectangle The rectangle. 3385 * @return Whether any parent scrolled. 3386 */ 3387 public boolean requestRectangleOnScreen(Rect rectangle) { 3388 return requestRectangleOnScreen(rectangle, false); 3389 } 3390 3391 /** 3392 * Request that a rectangle of this view be visible on the screen, 3393 * scrolling if necessary just enough. 3394 * 3395 * <p>A View should call this if it maintains some notion of which part 3396 * of its content is interesting. For example, a text editing view 3397 * should call this when its cursor moves. 3398 * 3399 * <p>When <code>immediate</code> is set to true, scrolling will not be 3400 * animated. 3401 * 3402 * @param rectangle The rectangle. 3403 * @param immediate True to forbid animated scrolling, false otherwise 3404 * @return Whether any parent scrolled. 3405 */ 3406 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3407 View child = this; 3408 ViewParent parent = mParent; 3409 boolean scrolled = false; 3410 while (parent != null) { 3411 scrolled |= parent.requestChildRectangleOnScreen(child, 3412 rectangle, immediate); 3413 3414 // offset rect so next call has the rectangle in the 3415 // coordinate system of its direct child. 3416 rectangle.offset(child.getLeft(), child.getTop()); 3417 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3418 3419 if (!(parent instanceof View)) { 3420 break; 3421 } 3422 3423 child = (View) parent; 3424 parent = child.getParent(); 3425 } 3426 return scrolled; 3427 } 3428 3429 /** 3430 * Called when this view wants to give up focus. This will cause 3431 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3432 */ 3433 public void clearFocus() { 3434 if (DBG) { 3435 System.out.println(this + " clearFocus()"); 3436 } 3437 3438 if ((mPrivateFlags & FOCUSED) != 0) { 3439 mPrivateFlags &= ~FOCUSED; 3440 3441 if (mParent != null) { 3442 mParent.clearChildFocus(this); 3443 } 3444 3445 onFocusChanged(false, 0, null); 3446 refreshDrawableState(); 3447 } 3448 } 3449 3450 /** 3451 * Called to clear the focus of a view that is about to be removed. 3452 * Doesn't call clearChildFocus, which prevents this view from taking 3453 * focus again before it has been removed from the parent 3454 */ 3455 void clearFocusForRemoval() { 3456 if ((mPrivateFlags & FOCUSED) != 0) { 3457 mPrivateFlags &= ~FOCUSED; 3458 3459 onFocusChanged(false, 0, null); 3460 refreshDrawableState(); 3461 } 3462 } 3463 3464 /** 3465 * Called internally by the view system when a new view is getting focus. 3466 * This is what clears the old focus. 3467 */ 3468 void unFocus() { 3469 if (DBG) { 3470 System.out.println(this + " unFocus()"); 3471 } 3472 3473 if ((mPrivateFlags & FOCUSED) != 0) { 3474 mPrivateFlags &= ~FOCUSED; 3475 3476 onFocusChanged(false, 0, null); 3477 refreshDrawableState(); 3478 } 3479 } 3480 3481 /** 3482 * Returns true if this view has focus iteself, or is the ancestor of the 3483 * view that has focus. 3484 * 3485 * @return True if this view has or contains focus, false otherwise. 3486 */ 3487 @ViewDebug.ExportedProperty(category = "focus") 3488 public boolean hasFocus() { 3489 return (mPrivateFlags & FOCUSED) != 0; 3490 } 3491 3492 /** 3493 * Returns true if this view is focusable or if it contains a reachable View 3494 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3495 * is a View whose parents do not block descendants focus. 3496 * 3497 * Only {@link #VISIBLE} views are considered focusable. 3498 * 3499 * @return True if the view is focusable or if the view contains a focusable 3500 * View, false otherwise. 3501 * 3502 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3503 */ 3504 public boolean hasFocusable() { 3505 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3506 } 3507 3508 /** 3509 * Called by the view system when the focus state of this view changes. 3510 * When the focus change event is caused by directional navigation, direction 3511 * and previouslyFocusedRect provide insight into where the focus is coming from. 3512 * When overriding, be sure to call up through to the super class so that 3513 * the standard focus handling will occur. 3514 * 3515 * @param gainFocus True if the View has focus; false otherwise. 3516 * @param direction The direction focus has moved when requestFocus() 3517 * is called to give this view focus. Values are 3518 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3519 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3520 * It may not always apply, in which case use the default. 3521 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3522 * system, of the previously focused view. If applicable, this will be 3523 * passed in as finer grained information about where the focus is coming 3524 * from (in addition to direction). Will be <code>null</code> otherwise. 3525 */ 3526 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3527 if (gainFocus) { 3528 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3529 } 3530 3531 InputMethodManager imm = InputMethodManager.peekInstance(); 3532 if (!gainFocus) { 3533 if (isPressed()) { 3534 setPressed(false); 3535 } 3536 if (imm != null && mAttachInfo != null 3537 && mAttachInfo.mHasWindowFocus) { 3538 imm.focusOut(this); 3539 } 3540 onFocusLost(); 3541 } else if (imm != null && mAttachInfo != null 3542 && mAttachInfo.mHasWindowFocus) { 3543 imm.focusIn(this); 3544 } 3545 3546 invalidate(true); 3547 if (mOnFocusChangeListener != null) { 3548 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3549 } 3550 3551 if (mAttachInfo != null) { 3552 mAttachInfo.mKeyDispatchState.reset(this); 3553 } 3554 } 3555 3556 /** 3557 * Sends an accessibility event of the given type. If accessiiblity is 3558 * not enabled this method has no effect. The default implementation calls 3559 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3560 * to populate information about the event source (this View), then calls 3561 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3562 * populate the text content of the event source including its descendants, 3563 * and last calls 3564 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3565 * on its parent to resuest sending of the event to interested parties. 3566 * 3567 * @param eventType The type of the event to send. 3568 * 3569 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3570 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3571 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3572 */ 3573 public void sendAccessibilityEvent(int eventType) { 3574 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3575 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3576 } 3577 } 3578 3579 /** 3580 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3581 * takes as an argument an empty {@link AccessibilityEvent} and does not 3582 * perfrom a check whether accessibility is enabled. 3583 * 3584 * @param event The event to send. 3585 * 3586 * @see #sendAccessibilityEvent(int) 3587 */ 3588 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3589 if (!isShown()) { 3590 return; 3591 } 3592 onInitializeAccessibilityEvent(event); 3593 dispatchPopulateAccessibilityEvent(event); 3594 // In the beginning we called #isShown(), so we know that getParent() is not null. 3595 getParent().requestSendAccessibilityEvent(this, event); 3596 } 3597 3598 /** 3599 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 3600 * to its children for adding their text content to the event. Note that the 3601 * event text is populated in a separate dispatch path since we add to the 3602 * event not only the text of the source but also the text of all its descendants. 3603 * </p> 3604 * A typical implementation will call 3605 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 3606 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3607 * on each child. Override this method if custom population of the event text 3608 * content is required. 3609 * 3610 * @param event The event. 3611 * 3612 * @return True if the event population was completed. 3613 */ 3614 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3615 onPopulateAccessibilityEvent(event); 3616 return false; 3617 } 3618 3619 /** 3620 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3621 * giving a chance to this View to populate the accessibility event with its 3622 * text content. While the implementation is free to modify other event 3623 * attributes this should be performed in 3624 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 3625 * <p> 3626 * Example: Adding formatted date string to an accessibility event in addition 3627 * to the text added by the super implementation. 3628 * </p><p><pre><code> 3629 * public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3630 * super.onPopulateAccessibilityEvent(event); 3631 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 3632 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 3633 * mCurrentDate.getTimeInMillis(), flags); 3634 * event.getText().add(selectedDateUtterance); 3635 * } 3636 * </code></pre></p> 3637 * 3638 * @param event The accessibility event which to populate. 3639 * 3640 * @see #sendAccessibilityEvent(int) 3641 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3642 */ 3643 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3644 3645 } 3646 3647 /** 3648 * Initializes an {@link AccessibilityEvent} with information about the 3649 * the type of the event and this View which is the event source. In other 3650 * words, the source of an accessibility event is the view whose state 3651 * change triggered firing the event. 3652 * <p> 3653 * Example: Setting the password property of an event in addition 3654 * to properties set by the super implementation. 3655 * </p><p><pre><code> 3656 * public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3657 * super.onInitializeAccessibilityEvent(event); 3658 * event.setPassword(true); 3659 * } 3660 * </code></pre></p> 3661 * @param event The event to initialeze. 3662 * 3663 * @see #sendAccessibilityEvent(int) 3664 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3665 */ 3666 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3667 event.setSource(this); 3668 event.setClassName(getClass().getName()); 3669 event.setPackageName(getContext().getPackageName()); 3670 event.setEnabled(isEnabled()); 3671 event.setContentDescription(mContentDescription); 3672 3673 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3674 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3675 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3676 event.setItemCount(focusablesTempList.size()); 3677 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3678 focusablesTempList.clear(); 3679 } 3680 } 3681 3682 /** 3683 * Returns an {@link AccessibilityNodeInfo} representing this view from the 3684 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 3685 * This method is responsible for obtaining an accessibility node info from a 3686 * pool of reusable instances and calling 3687 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 3688 * initialize the former. 3689 * <p> 3690 * Note: The client is responsible for recycling the obtained instance by calling 3691 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 3692 * </p> 3693 * @return A populated {@link AccessibilityNodeInfo}. 3694 * 3695 * @see AccessibilityNodeInfo 3696 */ 3697 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 3698 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 3699 onInitializeAccessibilityNodeInfo(info); 3700 return info; 3701 } 3702 3703 /** 3704 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 3705 * The base implementation sets: 3706 * <ul> 3707 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 3708 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 3709 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 3710 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 3711 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 3712 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 3713 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 3714 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 3715 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 3716 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 3717 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 3718 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 3719 * </ul> 3720 * <p> 3721 * Subclasses should override this method, call the super implementation, 3722 * and set additional attributes. 3723 * </p> 3724 * @param info The instance to initialize. 3725 */ 3726 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 3727 Rect bounds = mAttachInfo.mTmpInvalRect; 3728 getDrawingRect(bounds); 3729 info.setBoundsInParent(bounds); 3730 3731 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 3732 getLocationOnScreen(locationOnScreen); 3733 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 3734 info.setBoundsInScreen(bounds); 3735 3736 ViewParent parent = getParent(); 3737 if (parent instanceof View) { 3738 View parentView = (View) parent; 3739 info.setParent(parentView); 3740 } 3741 3742 info.setPackageName(mContext.getPackageName()); 3743 info.setClassName(getClass().getName()); 3744 info.setContentDescription(getContentDescription()); 3745 3746 info.setEnabled(isEnabled()); 3747 info.setClickable(isClickable()); 3748 info.setFocusable(isFocusable()); 3749 info.setFocused(isFocused()); 3750 info.setSelected(isSelected()); 3751 info.setLongClickable(isLongClickable()); 3752 3753 // TODO: These make sense only if we are in an AdapterView but all 3754 // views can be selected. Maybe from accessiiblity perspective 3755 // we should report as selectable view in an AdapterView. 3756 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 3757 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 3758 3759 if (isFocusable()) { 3760 if (isFocused()) { 3761 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 3762 } else { 3763 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 3764 } 3765 } 3766 } 3767 3768 /** 3769 * Gets the unique identifier of this view on the screen for accessibility purposes. 3770 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 3771 * 3772 * @return The view accessibility id. 3773 * 3774 * @hide 3775 */ 3776 public int getAccessibilityViewId() { 3777 if (mAccessibilityViewId == NO_ID) { 3778 mAccessibilityViewId = sNextAccessibilityViewId++; 3779 } 3780 return mAccessibilityViewId; 3781 } 3782 3783 /** 3784 * Gets the unique identifier of the window in which this View reseides. 3785 * 3786 * @return The window accessibility id. 3787 * 3788 * @hide 3789 */ 3790 public int getAccessibilityWindowId() { 3791 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 3792 } 3793 3794 /** 3795 * Gets the {@link View} description. It briefly describes the view and is 3796 * primarily used for accessibility support. Set this property to enable 3797 * better accessibility support for your application. This is especially 3798 * true for views that do not have textual representation (For example, 3799 * ImageButton). 3800 * 3801 * @return The content descriptiopn. 3802 * 3803 * @attr ref android.R.styleable#View_contentDescription 3804 */ 3805 public CharSequence getContentDescription() { 3806 return mContentDescription; 3807 } 3808 3809 /** 3810 * Sets the {@link View} description. It briefly describes the view and is 3811 * primarily used for accessibility support. Set this property to enable 3812 * better accessibility support for your application. This is especially 3813 * true for views that do not have textual representation (For example, 3814 * ImageButton). 3815 * 3816 * @param contentDescription The content description. 3817 * 3818 * @attr ref android.R.styleable#View_contentDescription 3819 */ 3820 public void setContentDescription(CharSequence contentDescription) { 3821 mContentDescription = contentDescription; 3822 } 3823 3824 /** 3825 * Invoked whenever this view loses focus, either by losing window focus or by losing 3826 * focus within its window. This method can be used to clear any state tied to the 3827 * focus. For instance, if a button is held pressed with the trackball and the window 3828 * loses focus, this method can be used to cancel the press. 3829 * 3830 * Subclasses of View overriding this method should always call super.onFocusLost(). 3831 * 3832 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3833 * @see #onWindowFocusChanged(boolean) 3834 * 3835 * @hide pending API council approval 3836 */ 3837 protected void onFocusLost() { 3838 resetPressedState(); 3839 } 3840 3841 private void resetPressedState() { 3842 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3843 return; 3844 } 3845 3846 if (isPressed()) { 3847 setPressed(false); 3848 3849 if (!mHasPerformedLongPress) { 3850 removeLongPressCallback(); 3851 } 3852 } 3853 } 3854 3855 /** 3856 * Returns true if this view has focus 3857 * 3858 * @return True if this view has focus, false otherwise. 3859 */ 3860 @ViewDebug.ExportedProperty(category = "focus") 3861 public boolean isFocused() { 3862 return (mPrivateFlags & FOCUSED) != 0; 3863 } 3864 3865 /** 3866 * Find the view in the hierarchy rooted at this view that currently has 3867 * focus. 3868 * 3869 * @return The view that currently has focus, or null if no focused view can 3870 * be found. 3871 */ 3872 public View findFocus() { 3873 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3874 } 3875 3876 /** 3877 * Change whether this view is one of the set of scrollable containers in 3878 * its window. This will be used to determine whether the window can 3879 * resize or must pan when a soft input area is open -- scrollable 3880 * containers allow the window to use resize mode since the container 3881 * will appropriately shrink. 3882 */ 3883 public void setScrollContainer(boolean isScrollContainer) { 3884 if (isScrollContainer) { 3885 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3886 mAttachInfo.mScrollContainers.add(this); 3887 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3888 } 3889 mPrivateFlags |= SCROLL_CONTAINER; 3890 } else { 3891 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3892 mAttachInfo.mScrollContainers.remove(this); 3893 } 3894 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3895 } 3896 } 3897 3898 /** 3899 * Returns the quality of the drawing cache. 3900 * 3901 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3902 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3903 * 3904 * @see #setDrawingCacheQuality(int) 3905 * @see #setDrawingCacheEnabled(boolean) 3906 * @see #isDrawingCacheEnabled() 3907 * 3908 * @attr ref android.R.styleable#View_drawingCacheQuality 3909 */ 3910 public int getDrawingCacheQuality() { 3911 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3912 } 3913 3914 /** 3915 * Set the drawing cache quality of this view. This value is used only when the 3916 * drawing cache is enabled 3917 * 3918 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3919 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3920 * 3921 * @see #getDrawingCacheQuality() 3922 * @see #setDrawingCacheEnabled(boolean) 3923 * @see #isDrawingCacheEnabled() 3924 * 3925 * @attr ref android.R.styleable#View_drawingCacheQuality 3926 */ 3927 public void setDrawingCacheQuality(int quality) { 3928 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3929 } 3930 3931 /** 3932 * Returns whether the screen should remain on, corresponding to the current 3933 * value of {@link #KEEP_SCREEN_ON}. 3934 * 3935 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3936 * 3937 * @see #setKeepScreenOn(boolean) 3938 * 3939 * @attr ref android.R.styleable#View_keepScreenOn 3940 */ 3941 public boolean getKeepScreenOn() { 3942 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3943 } 3944 3945 /** 3946 * Controls whether the screen should remain on, modifying the 3947 * value of {@link #KEEP_SCREEN_ON}. 3948 * 3949 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3950 * 3951 * @see #getKeepScreenOn() 3952 * 3953 * @attr ref android.R.styleable#View_keepScreenOn 3954 */ 3955 public void setKeepScreenOn(boolean keepScreenOn) { 3956 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3957 } 3958 3959 /** 3960 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3961 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3962 * 3963 * @attr ref android.R.styleable#View_nextFocusLeft 3964 */ 3965 public int getNextFocusLeftId() { 3966 return mNextFocusLeftId; 3967 } 3968 3969 /** 3970 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3971 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3972 * decide automatically. 3973 * 3974 * @attr ref android.R.styleable#View_nextFocusLeft 3975 */ 3976 public void setNextFocusLeftId(int nextFocusLeftId) { 3977 mNextFocusLeftId = nextFocusLeftId; 3978 } 3979 3980 /** 3981 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3982 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3983 * 3984 * @attr ref android.R.styleable#View_nextFocusRight 3985 */ 3986 public int getNextFocusRightId() { 3987 return mNextFocusRightId; 3988 } 3989 3990 /** 3991 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3992 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3993 * decide automatically. 3994 * 3995 * @attr ref android.R.styleable#View_nextFocusRight 3996 */ 3997 public void setNextFocusRightId(int nextFocusRightId) { 3998 mNextFocusRightId = nextFocusRightId; 3999 } 4000 4001 /** 4002 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4003 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4004 * 4005 * @attr ref android.R.styleable#View_nextFocusUp 4006 */ 4007 public int getNextFocusUpId() { 4008 return mNextFocusUpId; 4009 } 4010 4011 /** 4012 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4013 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4014 * decide automatically. 4015 * 4016 * @attr ref android.R.styleable#View_nextFocusUp 4017 */ 4018 public void setNextFocusUpId(int nextFocusUpId) { 4019 mNextFocusUpId = nextFocusUpId; 4020 } 4021 4022 /** 4023 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4024 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4025 * 4026 * @attr ref android.R.styleable#View_nextFocusDown 4027 */ 4028 public int getNextFocusDownId() { 4029 return mNextFocusDownId; 4030 } 4031 4032 /** 4033 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4034 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4035 * decide automatically. 4036 * 4037 * @attr ref android.R.styleable#View_nextFocusDown 4038 */ 4039 public void setNextFocusDownId(int nextFocusDownId) { 4040 mNextFocusDownId = nextFocusDownId; 4041 } 4042 4043 /** 4044 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4045 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4046 * 4047 * @attr ref android.R.styleable#View_nextFocusForward 4048 */ 4049 public int getNextFocusForwardId() { 4050 return mNextFocusForwardId; 4051 } 4052 4053 /** 4054 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4055 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4056 * decide automatically. 4057 * 4058 * @attr ref android.R.styleable#View_nextFocusForward 4059 */ 4060 public void setNextFocusForwardId(int nextFocusForwardId) { 4061 mNextFocusForwardId = nextFocusForwardId; 4062 } 4063 4064 /** 4065 * Returns the visibility of this view and all of its ancestors 4066 * 4067 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4068 */ 4069 public boolean isShown() { 4070 View current = this; 4071 //noinspection ConstantConditions 4072 do { 4073 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4074 return false; 4075 } 4076 ViewParent parent = current.mParent; 4077 if (parent == null) { 4078 return false; // We are not attached to the view root 4079 } 4080 if (!(parent instanceof View)) { 4081 return true; 4082 } 4083 current = (View) parent; 4084 } while (current != null); 4085 4086 return false; 4087 } 4088 4089 /** 4090 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4091 * is set 4092 * 4093 * @param insets Insets for system windows 4094 * 4095 * @return True if this view applied the insets, false otherwise 4096 */ 4097 protected boolean fitSystemWindows(Rect insets) { 4098 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4099 mPaddingLeft = insets.left; 4100 mPaddingTop = insets.top; 4101 mPaddingRight = insets.right; 4102 mPaddingBottom = insets.bottom; 4103 requestLayout(); 4104 return true; 4105 } 4106 return false; 4107 } 4108 4109 /** 4110 * Returns the visibility status for this view. 4111 * 4112 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4113 * @attr ref android.R.styleable#View_visibility 4114 */ 4115 @ViewDebug.ExportedProperty(mapping = { 4116 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4117 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4118 @ViewDebug.IntToString(from = GONE, to = "GONE") 4119 }) 4120 public int getVisibility() { 4121 return mViewFlags & VISIBILITY_MASK; 4122 } 4123 4124 /** 4125 * Set the enabled state of this view. 4126 * 4127 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4128 * @attr ref android.R.styleable#View_visibility 4129 */ 4130 @RemotableViewMethod 4131 public void setVisibility(int visibility) { 4132 setFlags(visibility, VISIBILITY_MASK); 4133 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4134 } 4135 4136 /** 4137 * Returns the enabled status for this view. The interpretation of the 4138 * enabled state varies by subclass. 4139 * 4140 * @return True if this view is enabled, false otherwise. 4141 */ 4142 @ViewDebug.ExportedProperty 4143 public boolean isEnabled() { 4144 return (mViewFlags & ENABLED_MASK) == ENABLED; 4145 } 4146 4147 /** 4148 * Set the enabled state of this view. The interpretation of the enabled 4149 * state varies by subclass. 4150 * 4151 * @param enabled True if this view is enabled, false otherwise. 4152 */ 4153 @RemotableViewMethod 4154 public void setEnabled(boolean enabled) { 4155 if (enabled == isEnabled()) return; 4156 4157 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4158 4159 /* 4160 * The View most likely has to change its appearance, so refresh 4161 * the drawable state. 4162 */ 4163 refreshDrawableState(); 4164 4165 // Invalidate too, since the default behavior for views is to be 4166 // be drawn at 50% alpha rather than to change the drawable. 4167 invalidate(true); 4168 } 4169 4170 /** 4171 * Set whether this view can receive the focus. 4172 * 4173 * Setting this to false will also ensure that this view is not focusable 4174 * in touch mode. 4175 * 4176 * @param focusable If true, this view can receive the focus. 4177 * 4178 * @see #setFocusableInTouchMode(boolean) 4179 * @attr ref android.R.styleable#View_focusable 4180 */ 4181 public void setFocusable(boolean focusable) { 4182 if (!focusable) { 4183 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4184 } 4185 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4186 } 4187 4188 /** 4189 * Set whether this view can receive focus while in touch mode. 4190 * 4191 * Setting this to true will also ensure that this view is focusable. 4192 * 4193 * @param focusableInTouchMode If true, this view can receive the focus while 4194 * in touch mode. 4195 * 4196 * @see #setFocusable(boolean) 4197 * @attr ref android.R.styleable#View_focusableInTouchMode 4198 */ 4199 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4200 // Focusable in touch mode should always be set before the focusable flag 4201 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4202 // which, in touch mode, will not successfully request focus on this view 4203 // because the focusable in touch mode flag is not set 4204 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4205 if (focusableInTouchMode) { 4206 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4207 } 4208 } 4209 4210 /** 4211 * Set whether this view should have sound effects enabled for events such as 4212 * clicking and touching. 4213 * 4214 * <p>You may wish to disable sound effects for a view if you already play sounds, 4215 * for instance, a dial key that plays dtmf tones. 4216 * 4217 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4218 * @see #isSoundEffectsEnabled() 4219 * @see #playSoundEffect(int) 4220 * @attr ref android.R.styleable#View_soundEffectsEnabled 4221 */ 4222 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4223 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4224 } 4225 4226 /** 4227 * @return whether this view should have sound effects enabled for events such as 4228 * clicking and touching. 4229 * 4230 * @see #setSoundEffectsEnabled(boolean) 4231 * @see #playSoundEffect(int) 4232 * @attr ref android.R.styleable#View_soundEffectsEnabled 4233 */ 4234 @ViewDebug.ExportedProperty 4235 public boolean isSoundEffectsEnabled() { 4236 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4237 } 4238 4239 /** 4240 * Set whether this view should have haptic feedback for events such as 4241 * long presses. 4242 * 4243 * <p>You may wish to disable haptic feedback if your view already controls 4244 * its own haptic feedback. 4245 * 4246 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4247 * @see #isHapticFeedbackEnabled() 4248 * @see #performHapticFeedback(int) 4249 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4250 */ 4251 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4252 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4253 } 4254 4255 /** 4256 * @return whether this view should have haptic feedback enabled for events 4257 * long presses. 4258 * 4259 * @see #setHapticFeedbackEnabled(boolean) 4260 * @see #performHapticFeedback(int) 4261 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4262 */ 4263 @ViewDebug.ExportedProperty 4264 public boolean isHapticFeedbackEnabled() { 4265 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4266 } 4267 4268 /** 4269 * Returns the layout direction for this view. 4270 * 4271 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4272 * {@link #LAYOUT_DIRECTION_RTL}, 4273 * {@link #LAYOUT_DIRECTION_INHERIT} or 4274 * {@link #LAYOUT_DIRECTION_LOCALE}. 4275 * @attr ref android.R.styleable#View_layoutDirection 4276 * 4277 * @hide 4278 */ 4279 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4280 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4281 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4282 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4283 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4284 }) 4285 public int getLayoutDirection() { 4286 return mViewFlags & LAYOUT_DIRECTION_MASK; 4287 } 4288 4289 /** 4290 * Set the layout direction for this view. 4291 * 4292 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4293 * {@link #LAYOUT_DIRECTION_RTL}, 4294 * {@link #LAYOUT_DIRECTION_INHERIT} or 4295 * {@link #LAYOUT_DIRECTION_LOCALE}. 4296 * @attr ref android.R.styleable#View_layoutDirection 4297 * 4298 * @hide 4299 */ 4300 @RemotableViewMethod 4301 public void setLayoutDirection(int layoutDirection) { 4302 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4303 } 4304 4305 /** 4306 * Returns the resolved layout direction for this view. 4307 * 4308 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4309 * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL. 4310 * 4311 * @hide 4312 */ 4313 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4314 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4315 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4316 }) 4317 public int getResolvedLayoutDirection() { 4318 resolveLayoutDirection(); 4319 return ((mPrivateFlags2 & RESOLVED_LAYOUT_RTL) == RESOLVED_LAYOUT_RTL) ? 4320 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4321 } 4322 4323 /** 4324 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 4325 * layout attribute and/or the inherited value from the parent.</p> 4326 * 4327 * @return true if the layout is right-to-left. 4328 * 4329 * @hide 4330 */ 4331 @ViewDebug.ExportedProperty(category = "layout") 4332 public boolean isLayoutRtl() { 4333 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4334 } 4335 4336 /** 4337 * If this view doesn't do any drawing on its own, set this flag to 4338 * allow further optimizations. By default, this flag is not set on 4339 * View, but could be set on some View subclasses such as ViewGroup. 4340 * 4341 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4342 * you should clear this flag. 4343 * 4344 * @param willNotDraw whether or not this View draw on its own 4345 */ 4346 public void setWillNotDraw(boolean willNotDraw) { 4347 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4348 } 4349 4350 /** 4351 * Returns whether or not this View draws on its own. 4352 * 4353 * @return true if this view has nothing to draw, false otherwise 4354 */ 4355 @ViewDebug.ExportedProperty(category = "drawing") 4356 public boolean willNotDraw() { 4357 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4358 } 4359 4360 /** 4361 * When a View's drawing cache is enabled, drawing is redirected to an 4362 * offscreen bitmap. Some views, like an ImageView, must be able to 4363 * bypass this mechanism if they already draw a single bitmap, to avoid 4364 * unnecessary usage of the memory. 4365 * 4366 * @param willNotCacheDrawing true if this view does not cache its 4367 * drawing, false otherwise 4368 */ 4369 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 4370 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 4371 } 4372 4373 /** 4374 * Returns whether or not this View can cache its drawing or not. 4375 * 4376 * @return true if this view does not cache its drawing, false otherwise 4377 */ 4378 @ViewDebug.ExportedProperty(category = "drawing") 4379 public boolean willNotCacheDrawing() { 4380 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 4381 } 4382 4383 /** 4384 * Indicates whether this view reacts to click events or not. 4385 * 4386 * @return true if the view is clickable, false otherwise 4387 * 4388 * @see #setClickable(boolean) 4389 * @attr ref android.R.styleable#View_clickable 4390 */ 4391 @ViewDebug.ExportedProperty 4392 public boolean isClickable() { 4393 return (mViewFlags & CLICKABLE) == CLICKABLE; 4394 } 4395 4396 /** 4397 * Enables or disables click events for this view. When a view 4398 * is clickable it will change its state to "pressed" on every click. 4399 * Subclasses should set the view clickable to visually react to 4400 * user's clicks. 4401 * 4402 * @param clickable true to make the view clickable, false otherwise 4403 * 4404 * @see #isClickable() 4405 * @attr ref android.R.styleable#View_clickable 4406 */ 4407 public void setClickable(boolean clickable) { 4408 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 4409 } 4410 4411 /** 4412 * Indicates whether this view reacts to long click events or not. 4413 * 4414 * @return true if the view is long clickable, false otherwise 4415 * 4416 * @see #setLongClickable(boolean) 4417 * @attr ref android.R.styleable#View_longClickable 4418 */ 4419 public boolean isLongClickable() { 4420 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4421 } 4422 4423 /** 4424 * Enables or disables long click events for this view. When a view is long 4425 * clickable it reacts to the user holding down the button for a longer 4426 * duration than a tap. This event can either launch the listener or a 4427 * context menu. 4428 * 4429 * @param longClickable true to make the view long clickable, false otherwise 4430 * @see #isLongClickable() 4431 * @attr ref android.R.styleable#View_longClickable 4432 */ 4433 public void setLongClickable(boolean longClickable) { 4434 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4435 } 4436 4437 /** 4438 * Sets the pressed state for this view. 4439 * 4440 * @see #isClickable() 4441 * @see #setClickable(boolean) 4442 * 4443 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4444 * the View's internal state from a previously set "pressed" state. 4445 */ 4446 public void setPressed(boolean pressed) { 4447 if (pressed) { 4448 mPrivateFlags |= PRESSED; 4449 } else { 4450 mPrivateFlags &= ~PRESSED; 4451 } 4452 refreshDrawableState(); 4453 dispatchSetPressed(pressed); 4454 } 4455 4456 /** 4457 * Dispatch setPressed to all of this View's children. 4458 * 4459 * @see #setPressed(boolean) 4460 * 4461 * @param pressed The new pressed state 4462 */ 4463 protected void dispatchSetPressed(boolean pressed) { 4464 } 4465 4466 /** 4467 * Indicates whether the view is currently in pressed state. Unless 4468 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 4469 * the pressed state. 4470 * 4471 * @see #setPressed(boolean) 4472 * @see #isClickable() 4473 * @see #setClickable(boolean) 4474 * 4475 * @return true if the view is currently pressed, false otherwise 4476 */ 4477 public boolean isPressed() { 4478 return (mPrivateFlags & PRESSED) == PRESSED; 4479 } 4480 4481 /** 4482 * Indicates whether this view will save its state (that is, 4483 * whether its {@link #onSaveInstanceState} method will be called). 4484 * 4485 * @return Returns true if the view state saving is enabled, else false. 4486 * 4487 * @see #setSaveEnabled(boolean) 4488 * @attr ref android.R.styleable#View_saveEnabled 4489 */ 4490 public boolean isSaveEnabled() { 4491 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 4492 } 4493 4494 /** 4495 * Controls whether the saving of this view's state is 4496 * enabled (that is, whether its {@link #onSaveInstanceState} method 4497 * will be called). Note that even if freezing is enabled, the 4498 * view still must have an id assigned to it (via {@link #setId(int)}) 4499 * for its state to be saved. This flag can only disable the 4500 * saving of this view; any child views may still have their state saved. 4501 * 4502 * @param enabled Set to false to <em>disable</em> state saving, or true 4503 * (the default) to allow it. 4504 * 4505 * @see #isSaveEnabled() 4506 * @see #setId(int) 4507 * @see #onSaveInstanceState() 4508 * @attr ref android.R.styleable#View_saveEnabled 4509 */ 4510 public void setSaveEnabled(boolean enabled) { 4511 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 4512 } 4513 4514 /** 4515 * Gets whether the framework should discard touches when the view's 4516 * window is obscured by another visible window. 4517 * Refer to the {@link View} security documentation for more details. 4518 * 4519 * @return True if touch filtering is enabled. 4520 * 4521 * @see #setFilterTouchesWhenObscured(boolean) 4522 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4523 */ 4524 @ViewDebug.ExportedProperty 4525 public boolean getFilterTouchesWhenObscured() { 4526 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4527 } 4528 4529 /** 4530 * Sets whether the framework should discard touches when the view's 4531 * window is obscured by another visible window. 4532 * Refer to the {@link View} security documentation for more details. 4533 * 4534 * @param enabled True if touch filtering should be enabled. 4535 * 4536 * @see #getFilterTouchesWhenObscured 4537 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4538 */ 4539 public void setFilterTouchesWhenObscured(boolean enabled) { 4540 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4541 FILTER_TOUCHES_WHEN_OBSCURED); 4542 } 4543 4544 /** 4545 * Indicates whether the entire hierarchy under this view will save its 4546 * state when a state saving traversal occurs from its parent. The default 4547 * is true; if false, these views will not be saved unless 4548 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4549 * 4550 * @return Returns true if the view state saving from parent is enabled, else false. 4551 * 4552 * @see #setSaveFromParentEnabled(boolean) 4553 */ 4554 public boolean isSaveFromParentEnabled() { 4555 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4556 } 4557 4558 /** 4559 * Controls whether the entire hierarchy under this view will save its 4560 * state when a state saving traversal occurs from its parent. The default 4561 * is true; if false, these views will not be saved unless 4562 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4563 * 4564 * @param enabled Set to false to <em>disable</em> state saving, or true 4565 * (the default) to allow it. 4566 * 4567 * @see #isSaveFromParentEnabled() 4568 * @see #setId(int) 4569 * @see #onSaveInstanceState() 4570 */ 4571 public void setSaveFromParentEnabled(boolean enabled) { 4572 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4573 } 4574 4575 4576 /** 4577 * Returns whether this View is able to take focus. 4578 * 4579 * @return True if this view can take focus, or false otherwise. 4580 * @attr ref android.R.styleable#View_focusable 4581 */ 4582 @ViewDebug.ExportedProperty(category = "focus") 4583 public final boolean isFocusable() { 4584 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4585 } 4586 4587 /** 4588 * When a view is focusable, it may not want to take focus when in touch mode. 4589 * For example, a button would like focus when the user is navigating via a D-pad 4590 * so that the user can click on it, but once the user starts touching the screen, 4591 * the button shouldn't take focus 4592 * @return Whether the view is focusable in touch mode. 4593 * @attr ref android.R.styleable#View_focusableInTouchMode 4594 */ 4595 @ViewDebug.ExportedProperty 4596 public final boolean isFocusableInTouchMode() { 4597 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4598 } 4599 4600 /** 4601 * Find the nearest view in the specified direction that can take focus. 4602 * This does not actually give focus to that view. 4603 * 4604 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4605 * 4606 * @return The nearest focusable in the specified direction, or null if none 4607 * can be found. 4608 */ 4609 public View focusSearch(int direction) { 4610 if (mParent != null) { 4611 return mParent.focusSearch(this, direction); 4612 } else { 4613 return null; 4614 } 4615 } 4616 4617 /** 4618 * This method is the last chance for the focused view and its ancestors to 4619 * respond to an arrow key. This is called when the focused view did not 4620 * consume the key internally, nor could the view system find a new view in 4621 * the requested direction to give focus to. 4622 * 4623 * @param focused The currently focused view. 4624 * @param direction The direction focus wants to move. One of FOCUS_UP, 4625 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4626 * @return True if the this view consumed this unhandled move. 4627 */ 4628 public boolean dispatchUnhandledMove(View focused, int direction) { 4629 return false; 4630 } 4631 4632 /** 4633 * If a user manually specified the next view id for a particular direction, 4634 * use the root to look up the view. 4635 * @param root The root view of the hierarchy containing this view. 4636 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4637 * or FOCUS_BACKWARD. 4638 * @return The user specified next view, or null if there is none. 4639 */ 4640 View findUserSetNextFocus(View root, int direction) { 4641 switch (direction) { 4642 case FOCUS_LEFT: 4643 if (mNextFocusLeftId == View.NO_ID) return null; 4644 return findViewShouldExist(root, mNextFocusLeftId); 4645 case FOCUS_RIGHT: 4646 if (mNextFocusRightId == View.NO_ID) return null; 4647 return findViewShouldExist(root, mNextFocusRightId); 4648 case FOCUS_UP: 4649 if (mNextFocusUpId == View.NO_ID) return null; 4650 return findViewShouldExist(root, mNextFocusUpId); 4651 case FOCUS_DOWN: 4652 if (mNextFocusDownId == View.NO_ID) return null; 4653 return findViewShouldExist(root, mNextFocusDownId); 4654 case FOCUS_FORWARD: 4655 if (mNextFocusForwardId == View.NO_ID) return null; 4656 return findViewShouldExist(root, mNextFocusForwardId); 4657 case FOCUS_BACKWARD: { 4658 final int id = mID; 4659 return root.findViewByPredicate(new Predicate<View>() { 4660 @Override 4661 public boolean apply(View t) { 4662 return t.mNextFocusForwardId == id; 4663 } 4664 }); 4665 } 4666 } 4667 return null; 4668 } 4669 4670 private static View findViewShouldExist(View root, int childViewId) { 4671 View result = root.findViewById(childViewId); 4672 if (result == null) { 4673 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4674 + "by user for id " + childViewId); 4675 } 4676 return result; 4677 } 4678 4679 /** 4680 * Find and return all focusable views that are descendants of this view, 4681 * possibly including this view if it is focusable itself. 4682 * 4683 * @param direction The direction of the focus 4684 * @return A list of focusable views 4685 */ 4686 public ArrayList<View> getFocusables(int direction) { 4687 ArrayList<View> result = new ArrayList<View>(24); 4688 addFocusables(result, direction); 4689 return result; 4690 } 4691 4692 /** 4693 * Add any focusable views that are descendants of this view (possibly 4694 * including this view if it is focusable itself) to views. If we are in touch mode, 4695 * only add views that are also focusable in touch mode. 4696 * 4697 * @param views Focusable views found so far 4698 * @param direction The direction of the focus 4699 */ 4700 public void addFocusables(ArrayList<View> views, int direction) { 4701 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4702 } 4703 4704 /** 4705 * Adds any focusable views that are descendants of this view (possibly 4706 * including this view if it is focusable itself) to views. This method 4707 * adds all focusable views regardless if we are in touch mode or 4708 * only views focusable in touch mode if we are in touch mode depending on 4709 * the focusable mode paramater. 4710 * 4711 * @param views Focusable views found so far or null if all we are interested is 4712 * the number of focusables. 4713 * @param direction The direction of the focus. 4714 * @param focusableMode The type of focusables to be added. 4715 * 4716 * @see #FOCUSABLES_ALL 4717 * @see #FOCUSABLES_TOUCH_MODE 4718 */ 4719 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4720 if (!isFocusable()) { 4721 return; 4722 } 4723 4724 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4725 isInTouchMode() && !isFocusableInTouchMode()) { 4726 return; 4727 } 4728 4729 if (views != null) { 4730 views.add(this); 4731 } 4732 } 4733 4734 /** 4735 * Finds the Views that contain given text. The containment is case insensitive. 4736 * As View's text is considered any text content that View renders. 4737 * 4738 * @param outViews The output list of matching Views. 4739 * @param text The text to match against. 4740 */ 4741 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 4742 } 4743 4744 /** 4745 * Find and return all touchable views that are descendants of this view, 4746 * possibly including this view if it is touchable itself. 4747 * 4748 * @return A list of touchable views 4749 */ 4750 public ArrayList<View> getTouchables() { 4751 ArrayList<View> result = new ArrayList<View>(); 4752 addTouchables(result); 4753 return result; 4754 } 4755 4756 /** 4757 * Add any touchable views that are descendants of this view (possibly 4758 * including this view if it is touchable itself) to views. 4759 * 4760 * @param views Touchable views found so far 4761 */ 4762 public void addTouchables(ArrayList<View> views) { 4763 final int viewFlags = mViewFlags; 4764 4765 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4766 && (viewFlags & ENABLED_MASK) == ENABLED) { 4767 views.add(this); 4768 } 4769 } 4770 4771 /** 4772 * Call this to try to give focus to a specific view or to one of its 4773 * descendants. 4774 * 4775 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 4776 * false), or if it is focusable and it is not focusable in touch mode 4777 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 4778 * 4779 * See also {@link #focusSearch(int)}, which is what you call to say that you 4780 * have focus, and you want your parent to look for the next one. 4781 * 4782 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4783 * {@link #FOCUS_DOWN} and <code>null</code>. 4784 * 4785 * @return Whether this view or one of its descendants actually took focus. 4786 */ 4787 public final boolean requestFocus() { 4788 return requestFocus(View.FOCUS_DOWN); 4789 } 4790 4791 4792 /** 4793 * Call this to try to give focus to a specific view or to one of its 4794 * descendants and give it a hint about what direction focus is heading. 4795 * 4796 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 4797 * false), or if it is focusable and it is not focusable in touch mode 4798 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 4799 * 4800 * See also {@link #focusSearch(int)}, which is what you call to say that you 4801 * have focus, and you want your parent to look for the next one. 4802 * 4803 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4804 * <code>null</code> set for the previously focused rectangle. 4805 * 4806 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4807 * @return Whether this view or one of its descendants actually took focus. 4808 */ 4809 public final boolean requestFocus(int direction) { 4810 return requestFocus(direction, null); 4811 } 4812 4813 /** 4814 * Call this to try to give focus to a specific view or to one of its descendants 4815 * and give it hints about the direction and a specific rectangle that the focus 4816 * is coming from. The rectangle can help give larger views a finer grained hint 4817 * about where focus is coming from, and therefore, where to show selection, or 4818 * forward focus change internally. 4819 * 4820 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 4821 * false), or if it is focusable and it is not focusable in touch mode 4822 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 4823 * 4824 * A View will not take focus if it is not visible. 4825 * 4826 * A View will not take focus if one of its parents has 4827 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 4828 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4829 * 4830 * See also {@link #focusSearch(int)}, which is what you call to say that you 4831 * have focus, and you want your parent to look for the next one. 4832 * 4833 * You may wish to override this method if your custom {@link View} has an internal 4834 * {@link View} that it wishes to forward the request to. 4835 * 4836 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4837 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4838 * to give a finer grained hint about where focus is coming from. May be null 4839 * if there is no hint. 4840 * @return Whether this view or one of its descendants actually took focus. 4841 */ 4842 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4843 // need to be focusable 4844 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4845 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4846 return false; 4847 } 4848 4849 // need to be focusable in touch mode if in touch mode 4850 if (isInTouchMode() && 4851 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4852 return false; 4853 } 4854 4855 // need to not have any parents blocking us 4856 if (hasAncestorThatBlocksDescendantFocus()) { 4857 return false; 4858 } 4859 4860 handleFocusGainInternal(direction, previouslyFocusedRect); 4861 return true; 4862 } 4863 4864 /** Gets the ViewAncestor, or null if not attached. */ 4865 /*package*/ ViewAncestor getViewAncestor() { 4866 View root = getRootView(); 4867 return root != null ? (ViewAncestor)root.getParent() : null; 4868 } 4869 4870 /** 4871 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4872 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4873 * touch mode to request focus when they are touched. 4874 * 4875 * @return Whether this view or one of its descendants actually took focus. 4876 * 4877 * @see #isInTouchMode() 4878 * 4879 */ 4880 public final boolean requestFocusFromTouch() { 4881 // Leave touch mode if we need to 4882 if (isInTouchMode()) { 4883 ViewAncestor viewRoot = getViewAncestor(); 4884 if (viewRoot != null) { 4885 viewRoot.ensureTouchMode(false); 4886 } 4887 } 4888 return requestFocus(View.FOCUS_DOWN); 4889 } 4890 4891 /** 4892 * @return Whether any ancestor of this view blocks descendant focus. 4893 */ 4894 private boolean hasAncestorThatBlocksDescendantFocus() { 4895 ViewParent ancestor = mParent; 4896 while (ancestor instanceof ViewGroup) { 4897 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4898 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4899 return true; 4900 } else { 4901 ancestor = vgAncestor.getParent(); 4902 } 4903 } 4904 return false; 4905 } 4906 4907 /** 4908 * @hide 4909 */ 4910 public void dispatchStartTemporaryDetach() { 4911 onStartTemporaryDetach(); 4912 } 4913 4914 /** 4915 * This is called when a container is going to temporarily detach a child, with 4916 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4917 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4918 * {@link #onDetachedFromWindow()} when the container is done. 4919 */ 4920 public void onStartTemporaryDetach() { 4921 removeUnsetPressCallback(); 4922 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4923 } 4924 4925 /** 4926 * @hide 4927 */ 4928 public void dispatchFinishTemporaryDetach() { 4929 onFinishTemporaryDetach(); 4930 } 4931 4932 /** 4933 * Called after {@link #onStartTemporaryDetach} when the container is done 4934 * changing the view. 4935 */ 4936 public void onFinishTemporaryDetach() { 4937 } 4938 4939 /** 4940 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4941 * for this view's window. Returns null if the view is not currently attached 4942 * to the window. Normally you will not need to use this directly, but 4943 * just use the standard high-level event callbacks like 4944 * {@link #onKeyDown(int, KeyEvent)}. 4945 */ 4946 public KeyEvent.DispatcherState getKeyDispatcherState() { 4947 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4948 } 4949 4950 /** 4951 * Dispatch a key event before it is processed by any input method 4952 * associated with the view hierarchy. This can be used to intercept 4953 * key events in special situations before the IME consumes them; a 4954 * typical example would be handling the BACK key to update the application's 4955 * UI instead of allowing the IME to see it and close itself. 4956 * 4957 * @param event The key event to be dispatched. 4958 * @return True if the event was handled, false otherwise. 4959 */ 4960 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4961 return onKeyPreIme(event.getKeyCode(), event); 4962 } 4963 4964 /** 4965 * Dispatch a key event to the next view on the focus path. This path runs 4966 * from the top of the view tree down to the currently focused view. If this 4967 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4968 * the next node down the focus path. This method also fires any key 4969 * listeners. 4970 * 4971 * @param event The key event to be dispatched. 4972 * @return True if the event was handled, false otherwise. 4973 */ 4974 public boolean dispatchKeyEvent(KeyEvent event) { 4975 if (mInputEventConsistencyVerifier != null) { 4976 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 4977 } 4978 4979 // Give any attached key listener a first crack at the event. 4980 //noinspection SimplifiableIfStatement 4981 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4982 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4983 return true; 4984 } 4985 4986 if (event.dispatch(this, mAttachInfo != null 4987 ? mAttachInfo.mKeyDispatchState : null, this)) { 4988 return true; 4989 } 4990 4991 if (mInputEventConsistencyVerifier != null) { 4992 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 4993 } 4994 return false; 4995 } 4996 4997 /** 4998 * Dispatches a key shortcut event. 4999 * 5000 * @param event The key event to be dispatched. 5001 * @return True if the event was handled by the view, false otherwise. 5002 */ 5003 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5004 return onKeyShortcut(event.getKeyCode(), event); 5005 } 5006 5007 /** 5008 * Pass the touch screen motion event down to the target view, or this 5009 * view if it is the target. 5010 * 5011 * @param event The motion event to be dispatched. 5012 * @return True if the event was handled by the view, false otherwise. 5013 */ 5014 public boolean dispatchTouchEvent(MotionEvent event) { 5015 if (mInputEventConsistencyVerifier != null) { 5016 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5017 } 5018 5019 if (onFilterTouchEventForSecurity(event)) { 5020 //noinspection SimplifiableIfStatement 5021 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 5022 mOnTouchListener.onTouch(this, event)) { 5023 return true; 5024 } 5025 5026 if (onTouchEvent(event)) { 5027 return true; 5028 } 5029 } 5030 5031 if (mInputEventConsistencyVerifier != null) { 5032 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5033 } 5034 return false; 5035 } 5036 5037 /** 5038 * Filter the touch event to apply security policies. 5039 * 5040 * @param event The motion event to be filtered. 5041 * @return True if the event should be dispatched, false if the event should be dropped. 5042 * 5043 * @see #getFilterTouchesWhenObscured 5044 */ 5045 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5046 //noinspection RedundantIfStatement 5047 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5048 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5049 // Window is obscured, drop this touch. 5050 return false; 5051 } 5052 return true; 5053 } 5054 5055 /** 5056 * Pass a trackball motion event down to the focused view. 5057 * 5058 * @param event The motion event to be dispatched. 5059 * @return True if the event was handled by the view, false otherwise. 5060 */ 5061 public boolean dispatchTrackballEvent(MotionEvent event) { 5062 if (mInputEventConsistencyVerifier != null) { 5063 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5064 } 5065 5066 //Log.i("view", "view=" + this + ", " + event.toString()); 5067 if (onTrackballEvent(event)) { 5068 return true; 5069 } 5070 5071 if (mInputEventConsistencyVerifier != null) { 5072 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5073 } 5074 return false; 5075 } 5076 5077 /** 5078 * Dispatch a generic motion event. 5079 * <p> 5080 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5081 * are delivered to the view under the pointer. All other generic motion events are 5082 * delivered to the focused view. Hover events are handled specially and are delivered 5083 * to {@link #onHoverEvent(MotionEvent)}. 5084 * </p> 5085 * 5086 * @param event The motion event to be dispatched. 5087 * @return True if the event was handled by the view, false otherwise. 5088 */ 5089 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5090 if (mInputEventConsistencyVerifier != null) { 5091 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5092 } 5093 5094 final int source = event.getSource(); 5095 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5096 final int action = event.getAction(); 5097 if (action == MotionEvent.ACTION_HOVER_ENTER 5098 || action == MotionEvent.ACTION_HOVER_MOVE 5099 || action == MotionEvent.ACTION_HOVER_EXIT) { 5100 if (dispatchHoverEvent(event)) { 5101 return true; 5102 } 5103 } else if (dispatchGenericPointerEvent(event)) { 5104 return true; 5105 } 5106 } else if (dispatchGenericFocusedEvent(event)) { 5107 return true; 5108 } 5109 5110 //noinspection SimplifiableIfStatement 5111 if (mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5112 && mOnGenericMotionListener.onGenericMotion(this, event)) { 5113 return true; 5114 } 5115 5116 if (onGenericMotionEvent(event)) { 5117 return true; 5118 } 5119 5120 if (mInputEventConsistencyVerifier != null) { 5121 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5122 } 5123 return false; 5124 } 5125 5126 /** 5127 * Dispatch a hover event. 5128 * <p> 5129 * Do not call this method directly. 5130 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5131 * </p> 5132 * 5133 * @param event The motion event to be dispatched. 5134 * @return True if the event was handled by the view, false otherwise. 5135 * @hide 5136 */ 5137 protected boolean dispatchHoverEvent(MotionEvent event) { 5138 return onHoverEvent(event); 5139 } 5140 5141 /** 5142 * Dispatch a generic motion event to the view under the first pointer. 5143 * <p> 5144 * Do not call this method directly. 5145 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5146 * </p> 5147 * 5148 * @param event The motion event to be dispatched. 5149 * @return True if the event was handled by the view, false otherwise. 5150 * @hide 5151 */ 5152 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5153 return false; 5154 } 5155 5156 /** 5157 * Dispatch a generic motion event to the currently focused view. 5158 * <p> 5159 * Do not call this method directly. 5160 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5161 * </p> 5162 * 5163 * @param event The motion event to be dispatched. 5164 * @return True if the event was handled by the view, false otherwise. 5165 * @hide 5166 */ 5167 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5168 return false; 5169 } 5170 5171 /** 5172 * Dispatch a pointer event. 5173 * <p> 5174 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5175 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5176 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5177 * and should not be expected to handle other pointing device features. 5178 * </p> 5179 * 5180 * @param event The motion event to be dispatched. 5181 * @return True if the event was handled by the view, false otherwise. 5182 * @hide 5183 */ 5184 public final boolean dispatchPointerEvent(MotionEvent event) { 5185 if (event.isTouchEvent()) { 5186 return dispatchTouchEvent(event); 5187 } else { 5188 return dispatchGenericMotionEvent(event); 5189 } 5190 } 5191 5192 /** 5193 * Called when the window containing this view gains or loses window focus. 5194 * ViewGroups should override to route to their children. 5195 * 5196 * @param hasFocus True if the window containing this view now has focus, 5197 * false otherwise. 5198 */ 5199 public void dispatchWindowFocusChanged(boolean hasFocus) { 5200 onWindowFocusChanged(hasFocus); 5201 } 5202 5203 /** 5204 * Called when the window containing this view gains or loses focus. Note 5205 * that this is separate from view focus: to receive key events, both 5206 * your view and its window must have focus. If a window is displayed 5207 * on top of yours that takes input focus, then your own window will lose 5208 * focus but the view focus will remain unchanged. 5209 * 5210 * @param hasWindowFocus True if the window containing this view now has 5211 * focus, false otherwise. 5212 */ 5213 public void onWindowFocusChanged(boolean hasWindowFocus) { 5214 InputMethodManager imm = InputMethodManager.peekInstance(); 5215 if (!hasWindowFocus) { 5216 if (isPressed()) { 5217 setPressed(false); 5218 } 5219 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5220 imm.focusOut(this); 5221 } 5222 removeLongPressCallback(); 5223 removeTapCallback(); 5224 onFocusLost(); 5225 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5226 imm.focusIn(this); 5227 } 5228 refreshDrawableState(); 5229 } 5230 5231 /** 5232 * Returns true if this view is in a window that currently has window focus. 5233 * Note that this is not the same as the view itself having focus. 5234 * 5235 * @return True if this view is in a window that currently has window focus. 5236 */ 5237 public boolean hasWindowFocus() { 5238 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5239 } 5240 5241 /** 5242 * Dispatch a view visibility change down the view hierarchy. 5243 * ViewGroups should override to route to their children. 5244 * @param changedView The view whose visibility changed. Could be 'this' or 5245 * an ancestor view. 5246 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5247 * {@link #INVISIBLE} or {@link #GONE}. 5248 */ 5249 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5250 onVisibilityChanged(changedView, visibility); 5251 } 5252 5253 /** 5254 * Called when the visibility of the view or an ancestor of the view is changed. 5255 * @param changedView The view whose visibility changed. Could be 'this' or 5256 * an ancestor view. 5257 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5258 * {@link #INVISIBLE} or {@link #GONE}. 5259 */ 5260 protected void onVisibilityChanged(View changedView, int visibility) { 5261 if (visibility == VISIBLE) { 5262 if (mAttachInfo != null) { 5263 initialAwakenScrollBars(); 5264 } else { 5265 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5266 } 5267 } 5268 } 5269 5270 /** 5271 * Dispatch a hint about whether this view is displayed. For instance, when 5272 * a View moves out of the screen, it might receives a display hint indicating 5273 * the view is not displayed. Applications should not <em>rely</em> on this hint 5274 * as there is no guarantee that they will receive one. 5275 * 5276 * @param hint A hint about whether or not this view is displayed: 5277 * {@link #VISIBLE} or {@link #INVISIBLE}. 5278 */ 5279 public void dispatchDisplayHint(int hint) { 5280 onDisplayHint(hint); 5281 } 5282 5283 /** 5284 * Gives this view a hint about whether is displayed or not. For instance, when 5285 * a View moves out of the screen, it might receives a display hint indicating 5286 * the view is not displayed. Applications should not <em>rely</em> on this hint 5287 * as there is no guarantee that they will receive one. 5288 * 5289 * @param hint A hint about whether or not this view is displayed: 5290 * {@link #VISIBLE} or {@link #INVISIBLE}. 5291 */ 5292 protected void onDisplayHint(int hint) { 5293 } 5294 5295 /** 5296 * Dispatch a window visibility change down the view hierarchy. 5297 * ViewGroups should override to route to their children. 5298 * 5299 * @param visibility The new visibility of the window. 5300 * 5301 * @see #onWindowVisibilityChanged(int) 5302 */ 5303 public void dispatchWindowVisibilityChanged(int visibility) { 5304 onWindowVisibilityChanged(visibility); 5305 } 5306 5307 /** 5308 * Called when the window containing has change its visibility 5309 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5310 * that this tells you whether or not your window is being made visible 5311 * to the window manager; this does <em>not</em> tell you whether or not 5312 * your window is obscured by other windows on the screen, even if it 5313 * is itself visible. 5314 * 5315 * @param visibility The new visibility of the window. 5316 */ 5317 protected void onWindowVisibilityChanged(int visibility) { 5318 if (visibility == VISIBLE) { 5319 initialAwakenScrollBars(); 5320 } 5321 } 5322 5323 /** 5324 * Returns the current visibility of the window this view is attached to 5325 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 5326 * 5327 * @return Returns the current visibility of the view's window. 5328 */ 5329 public int getWindowVisibility() { 5330 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 5331 } 5332 5333 /** 5334 * Retrieve the overall visible display size in which the window this view is 5335 * attached to has been positioned in. This takes into account screen 5336 * decorations above the window, for both cases where the window itself 5337 * is being position inside of them or the window is being placed under 5338 * then and covered insets are used for the window to position its content 5339 * inside. In effect, this tells you the available area where content can 5340 * be placed and remain visible to users. 5341 * 5342 * <p>This function requires an IPC back to the window manager to retrieve 5343 * the requested information, so should not be used in performance critical 5344 * code like drawing. 5345 * 5346 * @param outRect Filled in with the visible display frame. If the view 5347 * is not attached to a window, this is simply the raw display size. 5348 */ 5349 public void getWindowVisibleDisplayFrame(Rect outRect) { 5350 if (mAttachInfo != null) { 5351 try { 5352 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 5353 } catch (RemoteException e) { 5354 return; 5355 } 5356 // XXX This is really broken, and probably all needs to be done 5357 // in the window manager, and we need to know more about whether 5358 // we want the area behind or in front of the IME. 5359 final Rect insets = mAttachInfo.mVisibleInsets; 5360 outRect.left += insets.left; 5361 outRect.top += insets.top; 5362 outRect.right -= insets.right; 5363 outRect.bottom -= insets.bottom; 5364 return; 5365 } 5366 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 5367 d.getRectSize(outRect); 5368 } 5369 5370 /** 5371 * Dispatch a notification about a resource configuration change down 5372 * the view hierarchy. 5373 * ViewGroups should override to route to their children. 5374 * 5375 * @param newConfig The new resource configuration. 5376 * 5377 * @see #onConfigurationChanged(android.content.res.Configuration) 5378 */ 5379 public void dispatchConfigurationChanged(Configuration newConfig) { 5380 onConfigurationChanged(newConfig); 5381 } 5382 5383 /** 5384 * Called when the current configuration of the resources being used 5385 * by the application have changed. You can use this to decide when 5386 * to reload resources that can changed based on orientation and other 5387 * configuration characterstics. You only need to use this if you are 5388 * not relying on the normal {@link android.app.Activity} mechanism of 5389 * recreating the activity instance upon a configuration change. 5390 * 5391 * @param newConfig The new resource configuration. 5392 */ 5393 protected void onConfigurationChanged(Configuration newConfig) { 5394 } 5395 5396 /** 5397 * Private function to aggregate all per-view attributes in to the view 5398 * root. 5399 */ 5400 void dispatchCollectViewAttributes(int visibility) { 5401 performCollectViewAttributes(visibility); 5402 } 5403 5404 void performCollectViewAttributes(int visibility) { 5405 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 5406 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 5407 mAttachInfo.mKeepScreenOn = true; 5408 } 5409 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 5410 if (mOnSystemUiVisibilityChangeListener != null) { 5411 mAttachInfo.mHasSystemUiListeners = true; 5412 } 5413 } 5414 } 5415 5416 void needGlobalAttributesUpdate(boolean force) { 5417 final AttachInfo ai = mAttachInfo; 5418 if (ai != null) { 5419 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 5420 || ai.mHasSystemUiListeners) { 5421 ai.mRecomputeGlobalAttributes = true; 5422 } 5423 } 5424 } 5425 5426 /** 5427 * Returns whether the device is currently in touch mode. Touch mode is entered 5428 * once the user begins interacting with the device by touch, and affects various 5429 * things like whether focus is always visible to the user. 5430 * 5431 * @return Whether the device is in touch mode. 5432 */ 5433 @ViewDebug.ExportedProperty 5434 public boolean isInTouchMode() { 5435 if (mAttachInfo != null) { 5436 return mAttachInfo.mInTouchMode; 5437 } else { 5438 return ViewAncestor.isInTouchMode(); 5439 } 5440 } 5441 5442 /** 5443 * Returns the context the view is running in, through which it can 5444 * access the current theme, resources, etc. 5445 * 5446 * @return The view's Context. 5447 */ 5448 @ViewDebug.CapturedViewProperty 5449 public final Context getContext() { 5450 return mContext; 5451 } 5452 5453 /** 5454 * Handle a key event before it is processed by any input method 5455 * associated with the view hierarchy. This can be used to intercept 5456 * key events in special situations before the IME consumes them; a 5457 * typical example would be handling the BACK key to update the application's 5458 * UI instead of allowing the IME to see it and close itself. 5459 * 5460 * @param keyCode The value in event.getKeyCode(). 5461 * @param event Description of the key event. 5462 * @return If you handled the event, return true. If you want to allow the 5463 * event to be handled by the next receiver, return false. 5464 */ 5465 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 5466 return false; 5467 } 5468 5469 /** 5470 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 5471 * KeyEvent.Callback.onKeyDown()}: perform press of the view 5472 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 5473 * is released, if the view is enabled and clickable. 5474 * 5475 * @param keyCode A key code that represents the button pressed, from 5476 * {@link android.view.KeyEvent}. 5477 * @param event The KeyEvent object that defines the button action. 5478 */ 5479 public boolean onKeyDown(int keyCode, KeyEvent event) { 5480 boolean result = false; 5481 5482 switch (keyCode) { 5483 case KeyEvent.KEYCODE_DPAD_CENTER: 5484 case KeyEvent.KEYCODE_ENTER: { 5485 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5486 return true; 5487 } 5488 // Long clickable items don't necessarily have to be clickable 5489 if (((mViewFlags & CLICKABLE) == CLICKABLE || 5490 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 5491 (event.getRepeatCount() == 0)) { 5492 setPressed(true); 5493 checkForLongClick(0); 5494 return true; 5495 } 5496 break; 5497 } 5498 } 5499 return result; 5500 } 5501 5502 /** 5503 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 5504 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 5505 * the event). 5506 */ 5507 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 5508 return false; 5509 } 5510 5511 /** 5512 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 5513 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 5514 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 5515 * {@link KeyEvent#KEYCODE_ENTER} is released. 5516 * 5517 * @param keyCode A key code that represents the button pressed, from 5518 * {@link android.view.KeyEvent}. 5519 * @param event The KeyEvent object that defines the button action. 5520 */ 5521 public boolean onKeyUp(int keyCode, KeyEvent event) { 5522 boolean result = false; 5523 5524 switch (keyCode) { 5525 case KeyEvent.KEYCODE_DPAD_CENTER: 5526 case KeyEvent.KEYCODE_ENTER: { 5527 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5528 return true; 5529 } 5530 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 5531 setPressed(false); 5532 5533 if (!mHasPerformedLongPress) { 5534 // This is a tap, so remove the longpress check 5535 removeLongPressCallback(); 5536 5537 result = performClick(); 5538 } 5539 } 5540 break; 5541 } 5542 } 5543 return result; 5544 } 5545 5546 /** 5547 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 5548 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 5549 * the event). 5550 * 5551 * @param keyCode A key code that represents the button pressed, from 5552 * {@link android.view.KeyEvent}. 5553 * @param repeatCount The number of times the action was made. 5554 * @param event The KeyEvent object that defines the button action. 5555 */ 5556 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 5557 return false; 5558 } 5559 5560 /** 5561 * Called on the focused view when a key shortcut event is not handled. 5562 * Override this method to implement local key shortcuts for the View. 5563 * Key shortcuts can also be implemented by setting the 5564 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 5565 * 5566 * @param keyCode The value in event.getKeyCode(). 5567 * @param event Description of the key event. 5568 * @return If you handled the event, return true. If you want to allow the 5569 * event to be handled by the next receiver, return false. 5570 */ 5571 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 5572 return false; 5573 } 5574 5575 /** 5576 * Check whether the called view is a text editor, in which case it 5577 * would make sense to automatically display a soft input window for 5578 * it. Subclasses should override this if they implement 5579 * {@link #onCreateInputConnection(EditorInfo)} to return true if 5580 * a call on that method would return a non-null InputConnection, and 5581 * they are really a first-class editor that the user would normally 5582 * start typing on when the go into a window containing your view. 5583 * 5584 * <p>The default implementation always returns false. This does 5585 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 5586 * will not be called or the user can not otherwise perform edits on your 5587 * view; it is just a hint to the system that this is not the primary 5588 * purpose of this view. 5589 * 5590 * @return Returns true if this view is a text editor, else false. 5591 */ 5592 public boolean onCheckIsTextEditor() { 5593 return false; 5594 } 5595 5596 /** 5597 * Create a new InputConnection for an InputMethod to interact 5598 * with the view. The default implementation returns null, since it doesn't 5599 * support input methods. You can override this to implement such support. 5600 * This is only needed for views that take focus and text input. 5601 * 5602 * <p>When implementing this, you probably also want to implement 5603 * {@link #onCheckIsTextEditor()} to indicate you will return a 5604 * non-null InputConnection. 5605 * 5606 * @param outAttrs Fill in with attribute information about the connection. 5607 */ 5608 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 5609 return null; 5610 } 5611 5612 /** 5613 * Called by the {@link android.view.inputmethod.InputMethodManager} 5614 * when a view who is not the current 5615 * input connection target is trying to make a call on the manager. The 5616 * default implementation returns false; you can override this to return 5617 * true for certain views if you are performing InputConnection proxying 5618 * to them. 5619 * @param view The View that is making the InputMethodManager call. 5620 * @return Return true to allow the call, false to reject. 5621 */ 5622 public boolean checkInputConnectionProxy(View view) { 5623 return false; 5624 } 5625 5626 /** 5627 * Show the context menu for this view. It is not safe to hold on to the 5628 * menu after returning from this method. 5629 * 5630 * You should normally not overload this method. Overload 5631 * {@link #onCreateContextMenu(ContextMenu)} or define an 5632 * {@link OnCreateContextMenuListener} to add items to the context menu. 5633 * 5634 * @param menu The context menu to populate 5635 */ 5636 public void createContextMenu(ContextMenu menu) { 5637 ContextMenuInfo menuInfo = getContextMenuInfo(); 5638 5639 // Sets the current menu info so all items added to menu will have 5640 // my extra info set. 5641 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 5642 5643 onCreateContextMenu(menu); 5644 if (mOnCreateContextMenuListener != null) { 5645 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 5646 } 5647 5648 // Clear the extra information so subsequent items that aren't mine don't 5649 // have my extra info. 5650 ((MenuBuilder)menu).setCurrentMenuInfo(null); 5651 5652 if (mParent != null) { 5653 mParent.createContextMenu(menu); 5654 } 5655 } 5656 5657 /** 5658 * Views should implement this if they have extra information to associate 5659 * with the context menu. The return result is supplied as a parameter to 5660 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 5661 * callback. 5662 * 5663 * @return Extra information about the item for which the context menu 5664 * should be shown. This information will vary across different 5665 * subclasses of View. 5666 */ 5667 protected ContextMenuInfo getContextMenuInfo() { 5668 return null; 5669 } 5670 5671 /** 5672 * Views should implement this if the view itself is going to add items to 5673 * the context menu. 5674 * 5675 * @param menu the context menu to populate 5676 */ 5677 protected void onCreateContextMenu(ContextMenu menu) { 5678 } 5679 5680 /** 5681 * Implement this method to handle trackball motion events. The 5682 * <em>relative</em> movement of the trackball since the last event 5683 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 5684 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 5685 * that a movement of 1 corresponds to the user pressing one DPAD key (so 5686 * they will often be fractional values, representing the more fine-grained 5687 * movement information available from a trackball). 5688 * 5689 * @param event The motion event. 5690 * @return True if the event was handled, false otherwise. 5691 */ 5692 public boolean onTrackballEvent(MotionEvent event) { 5693 return false; 5694 } 5695 5696 /** 5697 * Implement this method to handle generic motion events. 5698 * <p> 5699 * Generic motion events describe joystick movements, mouse hovers, track pad 5700 * touches, scroll wheel movements and other input events. The 5701 * {@link MotionEvent#getSource() source} of the motion event specifies 5702 * the class of input that was received. Implementations of this method 5703 * must examine the bits in the source before processing the event. 5704 * The following code example shows how this is done. 5705 * </p><p> 5706 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5707 * are delivered to the view under the pointer. All other generic motion events are 5708 * delivered to the focused view. 5709 * </p> 5710 * <code> 5711 * public boolean onGenericMotionEvent(MotionEvent event) { 5712 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 5713 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 5714 * // process the joystick movement... 5715 * return true; 5716 * } 5717 * } 5718 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5719 * switch (event.getAction()) { 5720 * case MotionEvent.ACTION_HOVER_MOVE: 5721 * // process the mouse hover movement... 5722 * return true; 5723 * case MotionEvent.ACTION_SCROLL: 5724 * // process the scroll wheel movement... 5725 * return true; 5726 * } 5727 * } 5728 * return super.onGenericMotionEvent(event); 5729 * } 5730 * </code> 5731 * 5732 * @param event The generic motion event being processed. 5733 * @return True if the event was handled, false otherwise. 5734 */ 5735 public boolean onGenericMotionEvent(MotionEvent event) { 5736 return false; 5737 } 5738 5739 /** 5740 * Implement this method to handle hover events. 5741 * <p> 5742 * Hover events are pointer events with action {@link MotionEvent#ACTION_HOVER_ENTER}, 5743 * {@link MotionEvent#ACTION_HOVER_MOVE}, or {@link MotionEvent#ACTION_HOVER_EXIT}. 5744 * </p><p> 5745 * The view receives hover enter as the pointer enters the bounds of the view and hover 5746 * exit as the pointer exits the bound of the view or just before the pointer goes down 5747 * (which implies that {@link #onTouchEvent(MotionEvent)} will be called soon). 5748 * </p><p> 5749 * If the view would like to handle the hover event itself and prevent its children 5750 * from receiving hover, it should return true from this method. If this method returns 5751 * true and a child has already received a hover enter event, the child will 5752 * automatically receive a hover exit event. 5753 * </p><p> 5754 * The default implementation sets the hovered state of the view if the view is 5755 * clickable. 5756 * </p> 5757 * 5758 * @param event The motion event that describes the hover. 5759 * @return True if this view handled the hover event and does not want its children 5760 * to receive the hover event. 5761 */ 5762 public boolean onHoverEvent(MotionEvent event) { 5763 switch (event.getAction()) { 5764 case MotionEvent.ACTION_HOVER_ENTER: 5765 setHovered(true); 5766 break; 5767 5768 case MotionEvent.ACTION_HOVER_EXIT: 5769 setHovered(false); 5770 break; 5771 } 5772 5773 return false; 5774 } 5775 5776 /** 5777 * Returns true if the view is currently hovered. 5778 * 5779 * @return True if the view is currently hovered. 5780 */ 5781 public boolean isHovered() { 5782 return (mPrivateFlags & HOVERED) != 0; 5783 } 5784 5785 /** 5786 * Sets whether the view is currently hovered. 5787 * 5788 * @param hovered True if the view is hovered. 5789 */ 5790 public void setHovered(boolean hovered) { 5791 if (hovered) { 5792 if ((mPrivateFlags & HOVERED) == 0) { 5793 mPrivateFlags |= HOVERED; 5794 refreshDrawableState(); 5795 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 5796 } 5797 } else { 5798 if ((mPrivateFlags & HOVERED) != 0) { 5799 mPrivateFlags &= ~HOVERED; 5800 refreshDrawableState(); 5801 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 5802 } 5803 } 5804 } 5805 5806 /** 5807 * Implement this method to handle touch screen motion events. 5808 * 5809 * @param event The motion event. 5810 * @return True if the event was handled, false otherwise. 5811 */ 5812 public boolean onTouchEvent(MotionEvent event) { 5813 final int viewFlags = mViewFlags; 5814 5815 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5816 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 5817 mPrivateFlags &= ~PRESSED; 5818 refreshDrawableState(); 5819 } 5820 // A disabled view that is clickable still consumes the touch 5821 // events, it just doesn't respond to them. 5822 return (((viewFlags & CLICKABLE) == CLICKABLE || 5823 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5824 } 5825 5826 if (mTouchDelegate != null) { 5827 if (mTouchDelegate.onTouchEvent(event)) { 5828 return true; 5829 } 5830 } 5831 5832 if (((viewFlags & CLICKABLE) == CLICKABLE || 5833 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5834 switch (event.getAction()) { 5835 case MotionEvent.ACTION_UP: 5836 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5837 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5838 // take focus if we don't have it already and we should in 5839 // touch mode. 5840 boolean focusTaken = false; 5841 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5842 focusTaken = requestFocus(); 5843 } 5844 5845 if (prepressed) { 5846 // The button is being released before we actually 5847 // showed it as pressed. Make it show the pressed 5848 // state now (before scheduling the click) to ensure 5849 // the user sees it. 5850 mPrivateFlags |= PRESSED; 5851 refreshDrawableState(); 5852 } 5853 5854 if (!mHasPerformedLongPress) { 5855 // This is a tap, so remove the longpress check 5856 removeLongPressCallback(); 5857 5858 // Only perform take click actions if we were in the pressed state 5859 if (!focusTaken) { 5860 // Use a Runnable and post this rather than calling 5861 // performClick directly. This lets other visual state 5862 // of the view update before click actions start. 5863 if (mPerformClick == null) { 5864 mPerformClick = new PerformClick(); 5865 } 5866 if (!post(mPerformClick)) { 5867 performClick(); 5868 } 5869 } 5870 } 5871 5872 if (mUnsetPressedState == null) { 5873 mUnsetPressedState = new UnsetPressedState(); 5874 } 5875 5876 if (prepressed) { 5877 postDelayed(mUnsetPressedState, 5878 ViewConfiguration.getPressedStateDuration()); 5879 } else if (!post(mUnsetPressedState)) { 5880 // If the post failed, unpress right now 5881 mUnsetPressedState.run(); 5882 } 5883 removeTapCallback(); 5884 } 5885 break; 5886 5887 case MotionEvent.ACTION_DOWN: 5888 mHasPerformedLongPress = false; 5889 5890 if (performButtonActionOnTouchDown(event)) { 5891 break; 5892 } 5893 5894 // Walk up the hierarchy to determine if we're inside a scrolling container. 5895 boolean isInScrollingContainer = false; 5896 ViewParent p = getParent(); 5897 while (p != null && p instanceof ViewGroup) { 5898 if (((ViewGroup) p).shouldDelayChildPressedState()) { 5899 isInScrollingContainer = true; 5900 break; 5901 } 5902 p = p.getParent(); 5903 } 5904 5905 // For views inside a scrolling container, delay the pressed feedback for 5906 // a short period in case this is a scroll. 5907 if (isInScrollingContainer) { 5908 mPrivateFlags |= PREPRESSED; 5909 if (mPendingCheckForTap == null) { 5910 mPendingCheckForTap = new CheckForTap(); 5911 } 5912 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5913 } else { 5914 // Not inside a scrolling container, so show the feedback right away 5915 mPrivateFlags |= PRESSED; 5916 refreshDrawableState(); 5917 checkForLongClick(0); 5918 } 5919 break; 5920 5921 case MotionEvent.ACTION_CANCEL: 5922 mPrivateFlags &= ~PRESSED; 5923 refreshDrawableState(); 5924 removeTapCallback(); 5925 break; 5926 5927 case MotionEvent.ACTION_MOVE: 5928 final int x = (int) event.getX(); 5929 final int y = (int) event.getY(); 5930 5931 // Be lenient about moving outside of buttons 5932 if (!pointInView(x, y, mTouchSlop)) { 5933 // Outside button 5934 removeTapCallback(); 5935 if ((mPrivateFlags & PRESSED) != 0) { 5936 // Remove any future long press/tap checks 5937 removeLongPressCallback(); 5938 5939 // Need to switch from pressed to not pressed 5940 mPrivateFlags &= ~PRESSED; 5941 refreshDrawableState(); 5942 } 5943 } 5944 break; 5945 } 5946 return true; 5947 } 5948 5949 return false; 5950 } 5951 5952 /** 5953 * Remove the longpress detection timer. 5954 */ 5955 private void removeLongPressCallback() { 5956 if (mPendingCheckForLongPress != null) { 5957 removeCallbacks(mPendingCheckForLongPress); 5958 } 5959 } 5960 5961 /** 5962 * Remove the pending click action 5963 */ 5964 private void removePerformClickCallback() { 5965 if (mPerformClick != null) { 5966 removeCallbacks(mPerformClick); 5967 } 5968 } 5969 5970 /** 5971 * Remove the prepress detection timer. 5972 */ 5973 private void removeUnsetPressCallback() { 5974 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5975 setPressed(false); 5976 removeCallbacks(mUnsetPressedState); 5977 } 5978 } 5979 5980 /** 5981 * Remove the tap detection timer. 5982 */ 5983 private void removeTapCallback() { 5984 if (mPendingCheckForTap != null) { 5985 mPrivateFlags &= ~PREPRESSED; 5986 removeCallbacks(mPendingCheckForTap); 5987 } 5988 } 5989 5990 /** 5991 * Cancels a pending long press. Your subclass can use this if you 5992 * want the context menu to come up if the user presses and holds 5993 * at the same place, but you don't want it to come up if they press 5994 * and then move around enough to cause scrolling. 5995 */ 5996 public void cancelLongPress() { 5997 removeLongPressCallback(); 5998 5999 /* 6000 * The prepressed state handled by the tap callback is a display 6001 * construct, but the tap callback will post a long press callback 6002 * less its own timeout. Remove it here. 6003 */ 6004 removeTapCallback(); 6005 } 6006 6007 /** 6008 * Sets the TouchDelegate for this View. 6009 */ 6010 public void setTouchDelegate(TouchDelegate delegate) { 6011 mTouchDelegate = delegate; 6012 } 6013 6014 /** 6015 * Gets the TouchDelegate for this View. 6016 */ 6017 public TouchDelegate getTouchDelegate() { 6018 return mTouchDelegate; 6019 } 6020 6021 /** 6022 * Set flags controlling behavior of this view. 6023 * 6024 * @param flags Constant indicating the value which should be set 6025 * @param mask Constant indicating the bit range that should be changed 6026 */ 6027 void setFlags(int flags, int mask) { 6028 int old = mViewFlags; 6029 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6030 6031 int changed = mViewFlags ^ old; 6032 if (changed == 0) { 6033 return; 6034 } 6035 int privateFlags = mPrivateFlags; 6036 6037 /* Check if the FOCUSABLE bit has changed */ 6038 if (((changed & FOCUSABLE_MASK) != 0) && 6039 ((privateFlags & HAS_BOUNDS) !=0)) { 6040 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6041 && ((privateFlags & FOCUSED) != 0)) { 6042 /* Give up focus if we are no longer focusable */ 6043 clearFocus(); 6044 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6045 && ((privateFlags & FOCUSED) == 0)) { 6046 /* 6047 * Tell the view system that we are now available to take focus 6048 * if no one else already has it. 6049 */ 6050 if (mParent != null) mParent.focusableViewAvailable(this); 6051 } 6052 } 6053 6054 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6055 if ((changed & VISIBILITY_MASK) != 0) { 6056 /* 6057 * If this view is becoming visible, set the DRAWN flag so that 6058 * the next invalidate() will not be skipped. 6059 */ 6060 mPrivateFlags |= DRAWN; 6061 6062 needGlobalAttributesUpdate(true); 6063 6064 // a view becoming visible is worth notifying the parent 6065 // about in case nothing has focus. even if this specific view 6066 // isn't focusable, it may contain something that is, so let 6067 // the root view try to give this focus if nothing else does. 6068 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6069 mParent.focusableViewAvailable(this); 6070 } 6071 } 6072 } 6073 6074 /* Check if the GONE bit has changed */ 6075 if ((changed & GONE) != 0) { 6076 needGlobalAttributesUpdate(false); 6077 requestLayout(); 6078 invalidate(true); 6079 6080 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6081 if (hasFocus()) clearFocus(); 6082 destroyDrawingCache(); 6083 } 6084 if (mAttachInfo != null) { 6085 mAttachInfo.mViewVisibilityChanged = true; 6086 } 6087 } 6088 6089 /* Check if the VISIBLE bit has changed */ 6090 if ((changed & INVISIBLE) != 0) { 6091 needGlobalAttributesUpdate(false); 6092 invalidate(true); 6093 6094 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6095 // root view becoming invisible shouldn't clear focus 6096 if (getRootView() != this) { 6097 clearFocus(); 6098 } 6099 } 6100 if (mAttachInfo != null) { 6101 mAttachInfo.mViewVisibilityChanged = true; 6102 } 6103 } 6104 6105 if ((changed & VISIBILITY_MASK) != 0) { 6106 if (mParent instanceof ViewGroup) { 6107 ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6108 ((View) mParent).invalidate(true); 6109 } 6110 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6111 } 6112 6113 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6114 destroyDrawingCache(); 6115 } 6116 6117 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6118 destroyDrawingCache(); 6119 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6120 invalidateParentCaches(); 6121 } 6122 6123 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6124 destroyDrawingCache(); 6125 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6126 } 6127 6128 if ((changed & DRAW_MASK) != 0) { 6129 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6130 if (mBGDrawable != null) { 6131 mPrivateFlags &= ~SKIP_DRAW; 6132 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6133 } else { 6134 mPrivateFlags |= SKIP_DRAW; 6135 } 6136 } else { 6137 mPrivateFlags &= ~SKIP_DRAW; 6138 } 6139 requestLayout(); 6140 invalidate(true); 6141 } 6142 6143 if ((changed & KEEP_SCREEN_ON) != 0) { 6144 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6145 mParent.recomputeViewAttributes(this); 6146 } 6147 } 6148 6149 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6150 requestLayout(); 6151 } 6152 } 6153 6154 /** 6155 * Change the view's z order in the tree, so it's on top of other sibling 6156 * views 6157 */ 6158 public void bringToFront() { 6159 if (mParent != null) { 6160 mParent.bringChildToFront(this); 6161 } 6162 } 6163 6164 /** 6165 * This is called in response to an internal scroll in this view (i.e., the 6166 * view scrolled its own contents). This is typically as a result of 6167 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6168 * called. 6169 * 6170 * @param l Current horizontal scroll origin. 6171 * @param t Current vertical scroll origin. 6172 * @param oldl Previous horizontal scroll origin. 6173 * @param oldt Previous vertical scroll origin. 6174 */ 6175 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6176 mBackgroundSizeChanged = true; 6177 6178 final AttachInfo ai = mAttachInfo; 6179 if (ai != null) { 6180 ai.mViewScrollChanged = true; 6181 } 6182 } 6183 6184 /** 6185 * Interface definition for a callback to be invoked when the layout bounds of a view 6186 * changes due to layout processing. 6187 */ 6188 public interface OnLayoutChangeListener { 6189 /** 6190 * Called when the focus state of a view has changed. 6191 * 6192 * @param v The view whose state has changed. 6193 * @param left The new value of the view's left property. 6194 * @param top The new value of the view's top property. 6195 * @param right The new value of the view's right property. 6196 * @param bottom The new value of the view's bottom property. 6197 * @param oldLeft The previous value of the view's left property. 6198 * @param oldTop The previous value of the view's top property. 6199 * @param oldRight The previous value of the view's right property. 6200 * @param oldBottom The previous value of the view's bottom property. 6201 */ 6202 void onLayoutChange(View v, int left, int top, int right, int bottom, 6203 int oldLeft, int oldTop, int oldRight, int oldBottom); 6204 } 6205 6206 /** 6207 * This is called during layout when the size of this view has changed. If 6208 * you were just added to the view hierarchy, you're called with the old 6209 * values of 0. 6210 * 6211 * @param w Current width of this view. 6212 * @param h Current height of this view. 6213 * @param oldw Old width of this view. 6214 * @param oldh Old height of this view. 6215 */ 6216 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 6217 } 6218 6219 /** 6220 * Called by draw to draw the child views. This may be overridden 6221 * by derived classes to gain control just before its children are drawn 6222 * (but after its own view has been drawn). 6223 * @param canvas the canvas on which to draw the view 6224 */ 6225 protected void dispatchDraw(Canvas canvas) { 6226 } 6227 6228 /** 6229 * Gets the parent of this view. Note that the parent is a 6230 * ViewParent and not necessarily a View. 6231 * 6232 * @return Parent of this view. 6233 */ 6234 public final ViewParent getParent() { 6235 return mParent; 6236 } 6237 6238 /** 6239 * Set the horizontal scrolled position of your view. This will cause a call to 6240 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6241 * invalidated. 6242 * @param value the x position to scroll to 6243 */ 6244 public void setScrollX(int value) { 6245 scrollTo(value, mScrollY); 6246 } 6247 6248 /** 6249 * Set the vertical scrolled position of your view. This will cause a call to 6250 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6251 * invalidated. 6252 * @param value the y position to scroll to 6253 */ 6254 public void setScrollY(int value) { 6255 scrollTo(mScrollX, value); 6256 } 6257 6258 /** 6259 * Return the scrolled left position of this view. This is the left edge of 6260 * the displayed part of your view. You do not need to draw any pixels 6261 * farther left, since those are outside of the frame of your view on 6262 * screen. 6263 * 6264 * @return The left edge of the displayed part of your view, in pixels. 6265 */ 6266 public final int getScrollX() { 6267 return mScrollX; 6268 } 6269 6270 /** 6271 * Return the scrolled top position of this view. This is the top edge of 6272 * the displayed part of your view. You do not need to draw any pixels above 6273 * it, since those are outside of the frame of your view on screen. 6274 * 6275 * @return The top edge of the displayed part of your view, in pixels. 6276 */ 6277 public final int getScrollY() { 6278 return mScrollY; 6279 } 6280 6281 /** 6282 * Return the width of the your view. 6283 * 6284 * @return The width of your view, in pixels. 6285 */ 6286 @ViewDebug.ExportedProperty(category = "layout") 6287 public final int getWidth() { 6288 return mRight - mLeft; 6289 } 6290 6291 /** 6292 * Return the height of your view. 6293 * 6294 * @return The height of your view, in pixels. 6295 */ 6296 @ViewDebug.ExportedProperty(category = "layout") 6297 public final int getHeight() { 6298 return mBottom - mTop; 6299 } 6300 6301 /** 6302 * Return the visible drawing bounds of your view. Fills in the output 6303 * rectangle with the values from getScrollX(), getScrollY(), 6304 * getWidth(), and getHeight(). 6305 * 6306 * @param outRect The (scrolled) drawing bounds of the view. 6307 */ 6308 public void getDrawingRect(Rect outRect) { 6309 outRect.left = mScrollX; 6310 outRect.top = mScrollY; 6311 outRect.right = mScrollX + (mRight - mLeft); 6312 outRect.bottom = mScrollY + (mBottom - mTop); 6313 } 6314 6315 /** 6316 * Like {@link #getMeasuredWidthAndState()}, but only returns the 6317 * raw width component (that is the result is masked by 6318 * {@link #MEASURED_SIZE_MASK}). 6319 * 6320 * @return The raw measured width of this view. 6321 */ 6322 public final int getMeasuredWidth() { 6323 return mMeasuredWidth & MEASURED_SIZE_MASK; 6324 } 6325 6326 /** 6327 * Return the full width measurement information for this view as computed 6328 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6329 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6330 * This should be used during measurement and layout calculations only. Use 6331 * {@link #getWidth()} to see how wide a view is after layout. 6332 * 6333 * @return The measured width of this view as a bit mask. 6334 */ 6335 public final int getMeasuredWidthAndState() { 6336 return mMeasuredWidth; 6337 } 6338 6339 /** 6340 * Like {@link #getMeasuredHeightAndState()}, but only returns the 6341 * raw width component (that is the result is masked by 6342 * {@link #MEASURED_SIZE_MASK}). 6343 * 6344 * @return The raw measured height of this view. 6345 */ 6346 public final int getMeasuredHeight() { 6347 return mMeasuredHeight & MEASURED_SIZE_MASK; 6348 } 6349 6350 /** 6351 * Return the full height measurement information for this view as computed 6352 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6353 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6354 * This should be used during measurement and layout calculations only. Use 6355 * {@link #getHeight()} to see how wide a view is after layout. 6356 * 6357 * @return The measured width of this view as a bit mask. 6358 */ 6359 public final int getMeasuredHeightAndState() { 6360 return mMeasuredHeight; 6361 } 6362 6363 /** 6364 * Return only the state bits of {@link #getMeasuredWidthAndState()} 6365 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 6366 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 6367 * and the height component is at the shifted bits 6368 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 6369 */ 6370 public final int getMeasuredState() { 6371 return (mMeasuredWidth&MEASURED_STATE_MASK) 6372 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 6373 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 6374 } 6375 6376 /** 6377 * The transform matrix of this view, which is calculated based on the current 6378 * roation, scale, and pivot properties. 6379 * 6380 * @see #getRotation() 6381 * @see #getScaleX() 6382 * @see #getScaleY() 6383 * @see #getPivotX() 6384 * @see #getPivotY() 6385 * @return The current transform matrix for the view 6386 */ 6387 public Matrix getMatrix() { 6388 updateMatrix(); 6389 return mMatrix; 6390 } 6391 6392 /** 6393 * Utility function to determine if the value is far enough away from zero to be 6394 * considered non-zero. 6395 * @param value A floating point value to check for zero-ness 6396 * @return whether the passed-in value is far enough away from zero to be considered non-zero 6397 */ 6398 private static boolean nonzero(float value) { 6399 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 6400 } 6401 6402 /** 6403 * Returns true if the transform matrix is the identity matrix. 6404 * Recomputes the matrix if necessary. 6405 * 6406 * @return True if the transform matrix is the identity matrix, false otherwise. 6407 */ 6408 final boolean hasIdentityMatrix() { 6409 updateMatrix(); 6410 return mMatrixIsIdentity; 6411 } 6412 6413 /** 6414 * Recomputes the transform matrix if necessary. 6415 */ 6416 private void updateMatrix() { 6417 if (mMatrixDirty) { 6418 // transform-related properties have changed since the last time someone 6419 // asked for the matrix; recalculate it with the current values 6420 6421 // Figure out if we need to update the pivot point 6422 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6423 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 6424 mPrevWidth = mRight - mLeft; 6425 mPrevHeight = mBottom - mTop; 6426 mPivotX = mPrevWidth / 2f; 6427 mPivotY = mPrevHeight / 2f; 6428 } 6429 } 6430 mMatrix.reset(); 6431 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 6432 mMatrix.setTranslate(mTranslationX, mTranslationY); 6433 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 6434 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6435 } else { 6436 if (mCamera == null) { 6437 mCamera = new Camera(); 6438 matrix3D = new Matrix(); 6439 } 6440 mCamera.save(); 6441 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6442 mCamera.rotate(mRotationX, mRotationY, -mRotation); 6443 mCamera.getMatrix(matrix3D); 6444 matrix3D.preTranslate(-mPivotX, -mPivotY); 6445 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 6446 mMatrix.postConcat(matrix3D); 6447 mCamera.restore(); 6448 } 6449 mMatrixDirty = false; 6450 mMatrixIsIdentity = mMatrix.isIdentity(); 6451 mInverseMatrixDirty = true; 6452 } 6453 } 6454 6455 /** 6456 * Utility method to retrieve the inverse of the current mMatrix property. 6457 * We cache the matrix to avoid recalculating it when transform properties 6458 * have not changed. 6459 * 6460 * @return The inverse of the current matrix of this view. 6461 */ 6462 final Matrix getInverseMatrix() { 6463 updateMatrix(); 6464 if (mInverseMatrixDirty) { 6465 if (mInverseMatrix == null) { 6466 mInverseMatrix = new Matrix(); 6467 } 6468 mMatrix.invert(mInverseMatrix); 6469 mInverseMatrixDirty = false; 6470 } 6471 return mInverseMatrix; 6472 } 6473 6474 /** 6475 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 6476 * views are drawn) from the camera to this view. The camera's distance 6477 * affects 3D transformations, for instance rotations around the X and Y 6478 * axis. If the rotationX or rotationY properties are changed and this view is 6479 * large (more than half the size of the screen), it is recommended to always 6480 * use a camera distance that's greater than the height (X axis rotation) or 6481 * the width (Y axis rotation) of this view.</p> 6482 * 6483 * <p>The distance of the camera from the view plane can have an affect on the 6484 * perspective distortion of the view when it is rotated around the x or y axis. 6485 * For example, a large distance will result in a large viewing angle, and there 6486 * will not be much perspective distortion of the view as it rotates. A short 6487 * distance may cause much more perspective distortion upon rotation, and can 6488 * also result in some drawing artifacts if the rotated view ends up partially 6489 * behind the camera (which is why the recommendation is to use a distance at 6490 * least as far as the size of the view, if the view is to be rotated.)</p> 6491 * 6492 * <p>The distance is expressed in "depth pixels." The default distance depends 6493 * on the screen density. For instance, on a medium density display, the 6494 * default distance is 1280. On a high density display, the default distance 6495 * is 1920.</p> 6496 * 6497 * <p>If you want to specify a distance that leads to visually consistent 6498 * results across various densities, use the following formula:</p> 6499 * <pre> 6500 * float scale = context.getResources().getDisplayMetrics().density; 6501 * view.setCameraDistance(distance * scale); 6502 * </pre> 6503 * 6504 * <p>The density scale factor of a high density display is 1.5, 6505 * and 1920 = 1280 * 1.5.</p> 6506 * 6507 * @param distance The distance in "depth pixels", if negative the opposite 6508 * value is used 6509 * 6510 * @see #setRotationX(float) 6511 * @see #setRotationY(float) 6512 */ 6513 public void setCameraDistance(float distance) { 6514 invalidateParentCaches(); 6515 invalidate(false); 6516 6517 final float dpi = mResources.getDisplayMetrics().densityDpi; 6518 if (mCamera == null) { 6519 mCamera = new Camera(); 6520 matrix3D = new Matrix(); 6521 } 6522 6523 mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 6524 mMatrixDirty = true; 6525 6526 invalidate(false); 6527 } 6528 6529 /** 6530 * The degrees that the view is rotated around the pivot point. 6531 * 6532 * @see #setRotation(float) 6533 * @see #getPivotX() 6534 * @see #getPivotY() 6535 * 6536 * @return The degrees of rotation. 6537 */ 6538 public float getRotation() { 6539 return mRotation; 6540 } 6541 6542 /** 6543 * Sets the degrees that the view is rotated around the pivot point. Increasing values 6544 * result in clockwise rotation. 6545 * 6546 * @param rotation The degrees of rotation. 6547 * 6548 * @see #getRotation() 6549 * @see #getPivotX() 6550 * @see #getPivotY() 6551 * @see #setRotationX(float) 6552 * @see #setRotationY(float) 6553 * 6554 * @attr ref android.R.styleable#View_rotation 6555 */ 6556 public void setRotation(float rotation) { 6557 if (mRotation != rotation) { 6558 invalidateParentCaches(); 6559 // Double-invalidation is necessary to capture view's old and new areas 6560 invalidate(false); 6561 mRotation = rotation; 6562 mMatrixDirty = true; 6563 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6564 invalidate(false); 6565 } 6566 } 6567 6568 /** 6569 * The degrees that the view is rotated around the vertical axis through the pivot point. 6570 * 6571 * @see #getPivotX() 6572 * @see #getPivotY() 6573 * @see #setRotationY(float) 6574 * 6575 * @return The degrees of Y rotation. 6576 */ 6577 public float getRotationY() { 6578 return mRotationY; 6579 } 6580 6581 /** 6582 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 6583 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 6584 * down the y axis. 6585 * 6586 * When rotating large views, it is recommended to adjust the camera distance 6587 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 6588 * 6589 * @param rotationY The degrees of Y rotation. 6590 * 6591 * @see #getRotationY() 6592 * @see #getPivotX() 6593 * @see #getPivotY() 6594 * @see #setRotation(float) 6595 * @see #setRotationX(float) 6596 * @see #setCameraDistance(float) 6597 * 6598 * @attr ref android.R.styleable#View_rotationY 6599 */ 6600 public void setRotationY(float rotationY) { 6601 if (mRotationY != rotationY) { 6602 invalidateParentCaches(); 6603 // Double-invalidation is necessary to capture view's old and new areas 6604 invalidate(false); 6605 mRotationY = rotationY; 6606 mMatrixDirty = true; 6607 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6608 invalidate(false); 6609 } 6610 } 6611 6612 /** 6613 * The degrees that the view is rotated around the horizontal axis through the pivot point. 6614 * 6615 * @see #getPivotX() 6616 * @see #getPivotY() 6617 * @see #setRotationX(float) 6618 * 6619 * @return The degrees of X rotation. 6620 */ 6621 public float getRotationX() { 6622 return mRotationX; 6623 } 6624 6625 /** 6626 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 6627 * Increasing values result in clockwise rotation from the viewpoint of looking down the 6628 * x axis. 6629 * 6630 * When rotating large views, it is recommended to adjust the camera distance 6631 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 6632 * 6633 * @param rotationX The degrees of X rotation. 6634 * 6635 * @see #getRotationX() 6636 * @see #getPivotX() 6637 * @see #getPivotY() 6638 * @see #setRotation(float) 6639 * @see #setRotationY(float) 6640 * @see #setCameraDistance(float) 6641 * 6642 * @attr ref android.R.styleable#View_rotationX 6643 */ 6644 public void setRotationX(float rotationX) { 6645 if (mRotationX != rotationX) { 6646 invalidateParentCaches(); 6647 // Double-invalidation is necessary to capture view's old and new areas 6648 invalidate(false); 6649 mRotationX = rotationX; 6650 mMatrixDirty = true; 6651 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6652 invalidate(false); 6653 } 6654 } 6655 6656 /** 6657 * The amount that the view is scaled in x around the pivot point, as a proportion of 6658 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 6659 * 6660 * <p>By default, this is 1.0f. 6661 * 6662 * @see #getPivotX() 6663 * @see #getPivotY() 6664 * @return The scaling factor. 6665 */ 6666 public float getScaleX() { 6667 return mScaleX; 6668 } 6669 6670 /** 6671 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 6672 * the view's unscaled width. A value of 1 means that no scaling is applied. 6673 * 6674 * @param scaleX The scaling factor. 6675 * @see #getPivotX() 6676 * @see #getPivotY() 6677 * 6678 * @attr ref android.R.styleable#View_scaleX 6679 */ 6680 public void setScaleX(float scaleX) { 6681 if (mScaleX != scaleX) { 6682 invalidateParentCaches(); 6683 // Double-invalidation is necessary to capture view's old and new areas 6684 invalidate(false); 6685 mScaleX = scaleX; 6686 mMatrixDirty = true; 6687 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6688 invalidate(false); 6689 } 6690 } 6691 6692 /** 6693 * The amount that the view is scaled in y around the pivot point, as a proportion of 6694 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 6695 * 6696 * <p>By default, this is 1.0f. 6697 * 6698 * @see #getPivotX() 6699 * @see #getPivotY() 6700 * @return The scaling factor. 6701 */ 6702 public float getScaleY() { 6703 return mScaleY; 6704 } 6705 6706 /** 6707 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 6708 * the view's unscaled width. A value of 1 means that no scaling is applied. 6709 * 6710 * @param scaleY The scaling factor. 6711 * @see #getPivotX() 6712 * @see #getPivotY() 6713 * 6714 * @attr ref android.R.styleable#View_scaleY 6715 */ 6716 public void setScaleY(float scaleY) { 6717 if (mScaleY != scaleY) { 6718 invalidateParentCaches(); 6719 // Double-invalidation is necessary to capture view's old and new areas 6720 invalidate(false); 6721 mScaleY = scaleY; 6722 mMatrixDirty = true; 6723 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6724 invalidate(false); 6725 } 6726 } 6727 6728 /** 6729 * The x location of the point around which the view is {@link #setRotation(float) rotated} 6730 * and {@link #setScaleX(float) scaled}. 6731 * 6732 * @see #getRotation() 6733 * @see #getScaleX() 6734 * @see #getScaleY() 6735 * @see #getPivotY() 6736 * @return The x location of the pivot point. 6737 */ 6738 public float getPivotX() { 6739 return mPivotX; 6740 } 6741 6742 /** 6743 * Sets the x location of the point around which the view is 6744 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 6745 * By default, the pivot point is centered on the object. 6746 * Setting this property disables this behavior and causes the view to use only the 6747 * explicitly set pivotX and pivotY values. 6748 * 6749 * @param pivotX The x location of the pivot point. 6750 * @see #getRotation() 6751 * @see #getScaleX() 6752 * @see #getScaleY() 6753 * @see #getPivotY() 6754 * 6755 * @attr ref android.R.styleable#View_transformPivotX 6756 */ 6757 public void setPivotX(float pivotX) { 6758 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 6759 if (mPivotX != pivotX) { 6760 invalidateParentCaches(); 6761 // Double-invalidation is necessary to capture view's old and new areas 6762 invalidate(false); 6763 mPivotX = pivotX; 6764 mMatrixDirty = true; 6765 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6766 invalidate(false); 6767 } 6768 } 6769 6770 /** 6771 * The y location of the point around which the view is {@link #setRotation(float) rotated} 6772 * and {@link #setScaleY(float) scaled}. 6773 * 6774 * @see #getRotation() 6775 * @see #getScaleX() 6776 * @see #getScaleY() 6777 * @see #getPivotY() 6778 * @return The y location of the pivot point. 6779 */ 6780 public float getPivotY() { 6781 return mPivotY; 6782 } 6783 6784 /** 6785 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 6786 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 6787 * Setting this property disables this behavior and causes the view to use only the 6788 * explicitly set pivotX and pivotY values. 6789 * 6790 * @param pivotY The y location of the pivot point. 6791 * @see #getRotation() 6792 * @see #getScaleX() 6793 * @see #getScaleY() 6794 * @see #getPivotY() 6795 * 6796 * @attr ref android.R.styleable#View_transformPivotY 6797 */ 6798 public void setPivotY(float pivotY) { 6799 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 6800 if (mPivotY != pivotY) { 6801 invalidateParentCaches(); 6802 // Double-invalidation is necessary to capture view's old and new areas 6803 invalidate(false); 6804 mPivotY = pivotY; 6805 mMatrixDirty = true; 6806 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6807 invalidate(false); 6808 } 6809 } 6810 6811 /** 6812 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 6813 * completely transparent and 1 means the view is completely opaque. 6814 * 6815 * <p>By default this is 1.0f. 6816 * @return The opacity of the view. 6817 */ 6818 public float getAlpha() { 6819 return mAlpha; 6820 } 6821 6822 /** 6823 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 6824 * completely transparent and 1 means the view is completely opaque.</p> 6825 * 6826 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 6827 * responsible for applying the opacity itself. Otherwise, calling this method is 6828 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 6829 * setting a hardware layer.</p> 6830 * 6831 * @param alpha The opacity of the view. 6832 * 6833 * @see #setLayerType(int, android.graphics.Paint) 6834 * 6835 * @attr ref android.R.styleable#View_alpha 6836 */ 6837 public void setAlpha(float alpha) { 6838 mAlpha = alpha; 6839 invalidateParentCaches(); 6840 if (onSetAlpha((int) (alpha * 255))) { 6841 mPrivateFlags |= ALPHA_SET; 6842 // subclass is handling alpha - don't optimize rendering cache invalidation 6843 invalidate(true); 6844 } else { 6845 mPrivateFlags &= ~ALPHA_SET; 6846 invalidate(false); 6847 } 6848 } 6849 6850 /** 6851 * Faster version of setAlpha() which performs the same steps except there are 6852 * no calls to invalidate(). The caller of this function should perform proper invalidation 6853 * on the parent and this object. The return value indicates whether the subclass handles 6854 * alpha (the return value for onSetAlpha()). 6855 * 6856 * @param alpha The new value for the alpha property 6857 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) 6858 */ 6859 boolean setAlphaNoInvalidation(float alpha) { 6860 mAlpha = alpha; 6861 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 6862 if (subclassHandlesAlpha) { 6863 mPrivateFlags |= ALPHA_SET; 6864 } else { 6865 mPrivateFlags &= ~ALPHA_SET; 6866 } 6867 return subclassHandlesAlpha; 6868 } 6869 6870 /** 6871 * Top position of this view relative to its parent. 6872 * 6873 * @return The top of this view, in pixels. 6874 */ 6875 @ViewDebug.CapturedViewProperty 6876 public final int getTop() { 6877 return mTop; 6878 } 6879 6880 /** 6881 * Sets the top position of this view relative to its parent. This method is meant to be called 6882 * by the layout system and should not generally be called otherwise, because the property 6883 * may be changed at any time by the layout. 6884 * 6885 * @param top The top of this view, in pixels. 6886 */ 6887 public final void setTop(int top) { 6888 if (top != mTop) { 6889 updateMatrix(); 6890 if (mMatrixIsIdentity) { 6891 if (mAttachInfo != null) { 6892 int minTop; 6893 int yLoc; 6894 if (top < mTop) { 6895 minTop = top; 6896 yLoc = top - mTop; 6897 } else { 6898 minTop = mTop; 6899 yLoc = 0; 6900 } 6901 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 6902 } 6903 } else { 6904 // Double-invalidation is necessary to capture view's old and new areas 6905 invalidate(true); 6906 } 6907 6908 int width = mRight - mLeft; 6909 int oldHeight = mBottom - mTop; 6910 6911 mTop = top; 6912 6913 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6914 6915 if (!mMatrixIsIdentity) { 6916 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6917 // A change in dimension means an auto-centered pivot point changes, too 6918 mMatrixDirty = true; 6919 } 6920 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6921 invalidate(true); 6922 } 6923 mBackgroundSizeChanged = true; 6924 invalidateParentIfNeeded(); 6925 } 6926 } 6927 6928 /** 6929 * Bottom position of this view relative to its parent. 6930 * 6931 * @return The bottom of this view, in pixels. 6932 */ 6933 @ViewDebug.CapturedViewProperty 6934 public final int getBottom() { 6935 return mBottom; 6936 } 6937 6938 /** 6939 * True if this view has changed since the last time being drawn. 6940 * 6941 * @return The dirty state of this view. 6942 */ 6943 public boolean isDirty() { 6944 return (mPrivateFlags & DIRTY_MASK) != 0; 6945 } 6946 6947 /** 6948 * Sets the bottom position of this view relative to its parent. This method is meant to be 6949 * called by the layout system and should not generally be called otherwise, because the 6950 * property may be changed at any time by the layout. 6951 * 6952 * @param bottom The bottom of this view, in pixels. 6953 */ 6954 public final void setBottom(int bottom) { 6955 if (bottom != mBottom) { 6956 updateMatrix(); 6957 if (mMatrixIsIdentity) { 6958 if (mAttachInfo != null) { 6959 int maxBottom; 6960 if (bottom < mBottom) { 6961 maxBottom = mBottom; 6962 } else { 6963 maxBottom = bottom; 6964 } 6965 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 6966 } 6967 } else { 6968 // Double-invalidation is necessary to capture view's old and new areas 6969 invalidate(true); 6970 } 6971 6972 int width = mRight - mLeft; 6973 int oldHeight = mBottom - mTop; 6974 6975 mBottom = bottom; 6976 6977 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6978 6979 if (!mMatrixIsIdentity) { 6980 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6981 // A change in dimension means an auto-centered pivot point changes, too 6982 mMatrixDirty = true; 6983 } 6984 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6985 invalidate(true); 6986 } 6987 mBackgroundSizeChanged = true; 6988 invalidateParentIfNeeded(); 6989 } 6990 } 6991 6992 /** 6993 * Left position of this view relative to its parent. 6994 * 6995 * @return The left edge of this view, in pixels. 6996 */ 6997 @ViewDebug.CapturedViewProperty 6998 public final int getLeft() { 6999 return mLeft; 7000 } 7001 7002 /** 7003 * Sets the left position of this view relative to its parent. This method is meant to be called 7004 * by the layout system and should not generally be called otherwise, because the property 7005 * may be changed at any time by the layout. 7006 * 7007 * @param left The bottom of this view, in pixels. 7008 */ 7009 public final void setLeft(int left) { 7010 if (left != mLeft) { 7011 updateMatrix(); 7012 if (mMatrixIsIdentity) { 7013 if (mAttachInfo != null) { 7014 int minLeft; 7015 int xLoc; 7016 if (left < mLeft) { 7017 minLeft = left; 7018 xLoc = left - mLeft; 7019 } else { 7020 minLeft = mLeft; 7021 xLoc = 0; 7022 } 7023 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7024 } 7025 } else { 7026 // Double-invalidation is necessary to capture view's old and new areas 7027 invalidate(true); 7028 } 7029 7030 int oldWidth = mRight - mLeft; 7031 int height = mBottom - mTop; 7032 7033 mLeft = left; 7034 7035 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7036 7037 if (!mMatrixIsIdentity) { 7038 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7039 // A change in dimension means an auto-centered pivot point changes, too 7040 mMatrixDirty = true; 7041 } 7042 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7043 invalidate(true); 7044 } 7045 mBackgroundSizeChanged = true; 7046 invalidateParentIfNeeded(); 7047 } 7048 } 7049 7050 /** 7051 * Right position of this view relative to its parent. 7052 * 7053 * @return The right edge of this view, in pixels. 7054 */ 7055 @ViewDebug.CapturedViewProperty 7056 public final int getRight() { 7057 return mRight; 7058 } 7059 7060 /** 7061 * Sets the right position of this view relative to its parent. This method is meant to be called 7062 * by the layout system and should not generally be called otherwise, because the property 7063 * may be changed at any time by the layout. 7064 * 7065 * @param right The bottom of this view, in pixels. 7066 */ 7067 public final void setRight(int right) { 7068 if (right != mRight) { 7069 updateMatrix(); 7070 if (mMatrixIsIdentity) { 7071 if (mAttachInfo != null) { 7072 int maxRight; 7073 if (right < mRight) { 7074 maxRight = mRight; 7075 } else { 7076 maxRight = right; 7077 } 7078 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7079 } 7080 } else { 7081 // Double-invalidation is necessary to capture view's old and new areas 7082 invalidate(true); 7083 } 7084 7085 int oldWidth = mRight - mLeft; 7086 int height = mBottom - mTop; 7087 7088 mRight = right; 7089 7090 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7091 7092 if (!mMatrixIsIdentity) { 7093 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7094 // A change in dimension means an auto-centered pivot point changes, too 7095 mMatrixDirty = true; 7096 } 7097 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7098 invalidate(true); 7099 } 7100 mBackgroundSizeChanged = true; 7101 invalidateParentIfNeeded(); 7102 } 7103 } 7104 7105 /** 7106 * The visual x position of this view, in pixels. This is equivalent to the 7107 * {@link #setTranslationX(float) translationX} property plus the current 7108 * {@link #getLeft() left} property. 7109 * 7110 * @return The visual x position of this view, in pixels. 7111 */ 7112 public float getX() { 7113 return mLeft + mTranslationX; 7114 } 7115 7116 /** 7117 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 7118 * {@link #setTranslationX(float) translationX} property to be the difference between 7119 * the x value passed in and the current {@link #getLeft() left} property. 7120 * 7121 * @param x The visual x position of this view, in pixels. 7122 */ 7123 public void setX(float x) { 7124 setTranslationX(x - mLeft); 7125 } 7126 7127 /** 7128 * The visual y position of this view, in pixels. This is equivalent to the 7129 * {@link #setTranslationY(float) translationY} property plus the current 7130 * {@link #getTop() top} property. 7131 * 7132 * @return The visual y position of this view, in pixels. 7133 */ 7134 public float getY() { 7135 return mTop + mTranslationY; 7136 } 7137 7138 /** 7139 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 7140 * {@link #setTranslationY(float) translationY} property to be the difference between 7141 * the y value passed in and the current {@link #getTop() top} property. 7142 * 7143 * @param y The visual y position of this view, in pixels. 7144 */ 7145 public void setY(float y) { 7146 setTranslationY(y - mTop); 7147 } 7148 7149 7150 /** 7151 * The horizontal location of this view relative to its {@link #getLeft() left} position. 7152 * This position is post-layout, in addition to wherever the object's 7153 * layout placed it. 7154 * 7155 * @return The horizontal position of this view relative to its left position, in pixels. 7156 */ 7157 public float getTranslationX() { 7158 return mTranslationX; 7159 } 7160 7161 /** 7162 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 7163 * This effectively positions the object post-layout, in addition to wherever the object's 7164 * layout placed it. 7165 * 7166 * @param translationX The horizontal position of this view relative to its left position, 7167 * in pixels. 7168 * 7169 * @attr ref android.R.styleable#View_translationX 7170 */ 7171 public void setTranslationX(float translationX) { 7172 if (mTranslationX != translationX) { 7173 invalidateParentCaches(); 7174 // Double-invalidation is necessary to capture view's old and new areas 7175 invalidate(false); 7176 mTranslationX = translationX; 7177 mMatrixDirty = true; 7178 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7179 invalidate(false); 7180 } 7181 } 7182 7183 /** 7184 * The horizontal location of this view relative to its {@link #getTop() top} position. 7185 * This position is post-layout, in addition to wherever the object's 7186 * layout placed it. 7187 * 7188 * @return The vertical position of this view relative to its top position, 7189 * in pixels. 7190 */ 7191 public float getTranslationY() { 7192 return mTranslationY; 7193 } 7194 7195 /** 7196 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 7197 * This effectively positions the object post-layout, in addition to wherever the object's 7198 * layout placed it. 7199 * 7200 * @param translationY The vertical position of this view relative to its top position, 7201 * in pixels. 7202 * 7203 * @attr ref android.R.styleable#View_translationY 7204 */ 7205 public void setTranslationY(float translationY) { 7206 if (mTranslationY != translationY) { 7207 invalidateParentCaches(); 7208 // Double-invalidation is necessary to capture view's old and new areas 7209 invalidate(false); 7210 mTranslationY = translationY; 7211 mMatrixDirty = true; 7212 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7213 invalidate(false); 7214 } 7215 } 7216 7217 /** 7218 * @hide 7219 */ 7220 public void setFastTranslationX(float x) { 7221 mTranslationX = x; 7222 mMatrixDirty = true; 7223 } 7224 7225 /** 7226 * @hide 7227 */ 7228 public void setFastTranslationY(float y) { 7229 mTranslationY = y; 7230 mMatrixDirty = true; 7231 } 7232 7233 /** 7234 * @hide 7235 */ 7236 public void setFastX(float x) { 7237 mTranslationX = x - mLeft; 7238 mMatrixDirty = true; 7239 } 7240 7241 /** 7242 * @hide 7243 */ 7244 public void setFastY(float y) { 7245 mTranslationY = y - mTop; 7246 mMatrixDirty = true; 7247 } 7248 7249 /** 7250 * @hide 7251 */ 7252 public void setFastScaleX(float x) { 7253 mScaleX = x; 7254 mMatrixDirty = true; 7255 } 7256 7257 /** 7258 * @hide 7259 */ 7260 public void setFastScaleY(float y) { 7261 mScaleY = y; 7262 mMatrixDirty = true; 7263 } 7264 7265 /** 7266 * @hide 7267 */ 7268 public void setFastAlpha(float alpha) { 7269 mAlpha = alpha; 7270 } 7271 7272 /** 7273 * @hide 7274 */ 7275 public void setFastRotationY(float y) { 7276 mRotationY = y; 7277 mMatrixDirty = true; 7278 } 7279 7280 /** 7281 * Hit rectangle in parent's coordinates 7282 * 7283 * @param outRect The hit rectangle of the view. 7284 */ 7285 public void getHitRect(Rect outRect) { 7286 updateMatrix(); 7287 if (mMatrixIsIdentity || mAttachInfo == null) { 7288 outRect.set(mLeft, mTop, mRight, mBottom); 7289 } else { 7290 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 7291 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 7292 mMatrix.mapRect(tmpRect); 7293 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 7294 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 7295 } 7296 } 7297 7298 /** 7299 * Determines whether the given point, in local coordinates is inside the view. 7300 */ 7301 /*package*/ final boolean pointInView(float localX, float localY) { 7302 return localX >= 0 && localX < (mRight - mLeft) 7303 && localY >= 0 && localY < (mBottom - mTop); 7304 } 7305 7306 /** 7307 * Utility method to determine whether the given point, in local coordinates, 7308 * is inside the view, where the area of the view is expanded by the slop factor. 7309 * This method is called while processing touch-move events to determine if the event 7310 * is still within the view. 7311 */ 7312 private boolean pointInView(float localX, float localY, float slop) { 7313 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 7314 localY < ((mBottom - mTop) + slop); 7315 } 7316 7317 /** 7318 * When a view has focus and the user navigates away from it, the next view is searched for 7319 * starting from the rectangle filled in by this method. 7320 * 7321 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 7322 * of the view. However, if your view maintains some idea of internal selection, 7323 * such as a cursor, or a selected row or column, you should override this method and 7324 * fill in a more specific rectangle. 7325 * 7326 * @param r The rectangle to fill in, in this view's coordinates. 7327 */ 7328 public void getFocusedRect(Rect r) { 7329 getDrawingRect(r); 7330 } 7331 7332 /** 7333 * If some part of this view is not clipped by any of its parents, then 7334 * return that area in r in global (root) coordinates. To convert r to local 7335 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 7336 * -globalOffset.y)) If the view is completely clipped or translated out, 7337 * return false. 7338 * 7339 * @param r If true is returned, r holds the global coordinates of the 7340 * visible portion of this view. 7341 * @param globalOffset If true is returned, globalOffset holds the dx,dy 7342 * between this view and its root. globalOffet may be null. 7343 * @return true if r is non-empty (i.e. part of the view is visible at the 7344 * root level. 7345 */ 7346 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 7347 int width = mRight - mLeft; 7348 int height = mBottom - mTop; 7349 if (width > 0 && height > 0) { 7350 r.set(0, 0, width, height); 7351 if (globalOffset != null) { 7352 globalOffset.set(-mScrollX, -mScrollY); 7353 } 7354 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 7355 } 7356 return false; 7357 } 7358 7359 public final boolean getGlobalVisibleRect(Rect r) { 7360 return getGlobalVisibleRect(r, null); 7361 } 7362 7363 public final boolean getLocalVisibleRect(Rect r) { 7364 Point offset = new Point(); 7365 if (getGlobalVisibleRect(r, offset)) { 7366 r.offset(-offset.x, -offset.y); // make r local 7367 return true; 7368 } 7369 return false; 7370 } 7371 7372 /** 7373 * Offset this view's vertical location by the specified number of pixels. 7374 * 7375 * @param offset the number of pixels to offset the view by 7376 */ 7377 public void offsetTopAndBottom(int offset) { 7378 if (offset != 0) { 7379 updateMatrix(); 7380 if (mMatrixIsIdentity) { 7381 final ViewParent p = mParent; 7382 if (p != null && mAttachInfo != null) { 7383 final Rect r = mAttachInfo.mTmpInvalRect; 7384 int minTop; 7385 int maxBottom; 7386 int yLoc; 7387 if (offset < 0) { 7388 minTop = mTop + offset; 7389 maxBottom = mBottom; 7390 yLoc = offset; 7391 } else { 7392 minTop = mTop; 7393 maxBottom = mBottom + offset; 7394 yLoc = 0; 7395 } 7396 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 7397 p.invalidateChild(this, r); 7398 } 7399 } else { 7400 invalidate(false); 7401 } 7402 7403 mTop += offset; 7404 mBottom += offset; 7405 7406 if (!mMatrixIsIdentity) { 7407 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7408 invalidate(false); 7409 } 7410 invalidateParentIfNeeded(); 7411 } 7412 } 7413 7414 /** 7415 * Offset this view's horizontal location by the specified amount of pixels. 7416 * 7417 * @param offset the numer of pixels to offset the view by 7418 */ 7419 public void offsetLeftAndRight(int offset) { 7420 if (offset != 0) { 7421 updateMatrix(); 7422 if (mMatrixIsIdentity) { 7423 final ViewParent p = mParent; 7424 if (p != null && mAttachInfo != null) { 7425 final Rect r = mAttachInfo.mTmpInvalRect; 7426 int minLeft; 7427 int maxRight; 7428 if (offset < 0) { 7429 minLeft = mLeft + offset; 7430 maxRight = mRight; 7431 } else { 7432 minLeft = mLeft; 7433 maxRight = mRight + offset; 7434 } 7435 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 7436 p.invalidateChild(this, r); 7437 } 7438 } else { 7439 invalidate(false); 7440 } 7441 7442 mLeft += offset; 7443 mRight += offset; 7444 7445 if (!mMatrixIsIdentity) { 7446 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7447 invalidate(false); 7448 } 7449 invalidateParentIfNeeded(); 7450 } 7451 } 7452 7453 /** 7454 * Get the LayoutParams associated with this view. All views should have 7455 * layout parameters. These supply parameters to the <i>parent</i> of this 7456 * view specifying how it should be arranged. There are many subclasses of 7457 * ViewGroup.LayoutParams, and these correspond to the different subclasses 7458 * of ViewGroup that are responsible for arranging their children. 7459 * 7460 * This method may return null if this View is not attached to a parent 7461 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 7462 * was not invoked successfully. When a View is attached to a parent 7463 * ViewGroup, this method must not return null. 7464 * 7465 * @return The LayoutParams associated with this view, or null if no 7466 * parameters have been set yet 7467 */ 7468 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 7469 public ViewGroup.LayoutParams getLayoutParams() { 7470 return mLayoutParams; 7471 } 7472 7473 /** 7474 * Set the layout parameters associated with this view. These supply 7475 * parameters to the <i>parent</i> of this view specifying how it should be 7476 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 7477 * correspond to the different subclasses of ViewGroup that are responsible 7478 * for arranging their children. 7479 * 7480 * @param params The layout parameters for this view, cannot be null 7481 */ 7482 public void setLayoutParams(ViewGroup.LayoutParams params) { 7483 if (params == null) { 7484 throw new NullPointerException("Layout parameters cannot be null"); 7485 } 7486 mLayoutParams = params; 7487 requestLayout(); 7488 } 7489 7490 /** 7491 * Set the scrolled position of your view. This will cause a call to 7492 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7493 * invalidated. 7494 * @param x the x position to scroll to 7495 * @param y the y position to scroll to 7496 */ 7497 public void scrollTo(int x, int y) { 7498 if (mScrollX != x || mScrollY != y) { 7499 int oldX = mScrollX; 7500 int oldY = mScrollY; 7501 mScrollX = x; 7502 mScrollY = y; 7503 invalidateParentCaches(); 7504 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 7505 if (!awakenScrollBars()) { 7506 invalidate(true); 7507 } 7508 } 7509 } 7510 7511 /** 7512 * Move the scrolled position of your view. This will cause a call to 7513 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7514 * invalidated. 7515 * @param x the amount of pixels to scroll by horizontally 7516 * @param y the amount of pixels to scroll by vertically 7517 */ 7518 public void scrollBy(int x, int y) { 7519 scrollTo(mScrollX + x, mScrollY + y); 7520 } 7521 7522 /** 7523 * <p>Trigger the scrollbars to draw. When invoked this method starts an 7524 * animation to fade the scrollbars out after a default delay. If a subclass 7525 * provides animated scrolling, the start delay should equal the duration 7526 * of the scrolling animation.</p> 7527 * 7528 * <p>The animation starts only if at least one of the scrollbars is 7529 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 7530 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7531 * this method returns true, and false otherwise. If the animation is 7532 * started, this method calls {@link #invalidate()}; in that case the 7533 * caller should not call {@link #invalidate()}.</p> 7534 * 7535 * <p>This method should be invoked every time a subclass directly updates 7536 * the scroll parameters.</p> 7537 * 7538 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 7539 * and {@link #scrollTo(int, int)}.</p> 7540 * 7541 * @return true if the animation is played, false otherwise 7542 * 7543 * @see #awakenScrollBars(int) 7544 * @see #scrollBy(int, int) 7545 * @see #scrollTo(int, int) 7546 * @see #isHorizontalScrollBarEnabled() 7547 * @see #isVerticalScrollBarEnabled() 7548 * @see #setHorizontalScrollBarEnabled(boolean) 7549 * @see #setVerticalScrollBarEnabled(boolean) 7550 */ 7551 protected boolean awakenScrollBars() { 7552 return mScrollCache != null && 7553 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 7554 } 7555 7556 /** 7557 * Trigger the scrollbars to draw. 7558 * This method differs from awakenScrollBars() only in its default duration. 7559 * initialAwakenScrollBars() will show the scroll bars for longer than 7560 * usual to give the user more of a chance to notice them. 7561 * 7562 * @return true if the animation is played, false otherwise. 7563 */ 7564 private boolean initialAwakenScrollBars() { 7565 return mScrollCache != null && 7566 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 7567 } 7568 7569 /** 7570 * <p> 7571 * Trigger the scrollbars to draw. When invoked this method starts an 7572 * animation to fade the scrollbars out after a fixed delay. If a subclass 7573 * provides animated scrolling, the start delay should equal the duration of 7574 * the scrolling animation. 7575 * </p> 7576 * 7577 * <p> 7578 * The animation starts only if at least one of the scrollbars is enabled, 7579 * as specified by {@link #isHorizontalScrollBarEnabled()} and 7580 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7581 * this method returns true, and false otherwise. If the animation is 7582 * started, this method calls {@link #invalidate()}; in that case the caller 7583 * should not call {@link #invalidate()}. 7584 * </p> 7585 * 7586 * <p> 7587 * This method should be invoked everytime a subclass directly updates the 7588 * scroll parameters. 7589 * </p> 7590 * 7591 * @param startDelay the delay, in milliseconds, after which the animation 7592 * should start; when the delay is 0, the animation starts 7593 * immediately 7594 * @return true if the animation is played, false otherwise 7595 * 7596 * @see #scrollBy(int, int) 7597 * @see #scrollTo(int, int) 7598 * @see #isHorizontalScrollBarEnabled() 7599 * @see #isVerticalScrollBarEnabled() 7600 * @see #setHorizontalScrollBarEnabled(boolean) 7601 * @see #setVerticalScrollBarEnabled(boolean) 7602 */ 7603 protected boolean awakenScrollBars(int startDelay) { 7604 return awakenScrollBars(startDelay, true); 7605 } 7606 7607 /** 7608 * <p> 7609 * Trigger the scrollbars to draw. When invoked this method starts an 7610 * animation to fade the scrollbars out after a fixed delay. If a subclass 7611 * provides animated scrolling, the start delay should equal the duration of 7612 * the scrolling animation. 7613 * </p> 7614 * 7615 * <p> 7616 * The animation starts only if at least one of the scrollbars is enabled, 7617 * as specified by {@link #isHorizontalScrollBarEnabled()} and 7618 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7619 * this method returns true, and false otherwise. If the animation is 7620 * started, this method calls {@link #invalidate()} if the invalidate parameter 7621 * is set to true; in that case the caller 7622 * should not call {@link #invalidate()}. 7623 * </p> 7624 * 7625 * <p> 7626 * This method should be invoked everytime a subclass directly updates the 7627 * scroll parameters. 7628 * </p> 7629 * 7630 * @param startDelay the delay, in milliseconds, after which the animation 7631 * should start; when the delay is 0, the animation starts 7632 * immediately 7633 * 7634 * @param invalidate Wheter this method should call invalidate 7635 * 7636 * @return true if the animation is played, false otherwise 7637 * 7638 * @see #scrollBy(int, int) 7639 * @see #scrollTo(int, int) 7640 * @see #isHorizontalScrollBarEnabled() 7641 * @see #isVerticalScrollBarEnabled() 7642 * @see #setHorizontalScrollBarEnabled(boolean) 7643 * @see #setVerticalScrollBarEnabled(boolean) 7644 */ 7645 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 7646 final ScrollabilityCache scrollCache = mScrollCache; 7647 7648 if (scrollCache == null || !scrollCache.fadeScrollBars) { 7649 return false; 7650 } 7651 7652 if (scrollCache.scrollBar == null) { 7653 scrollCache.scrollBar = new ScrollBarDrawable(); 7654 } 7655 7656 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 7657 7658 if (invalidate) { 7659 // Invalidate to show the scrollbars 7660 invalidate(true); 7661 } 7662 7663 if (scrollCache.state == ScrollabilityCache.OFF) { 7664 // FIXME: this is copied from WindowManagerService. 7665 // We should get this value from the system when it 7666 // is possible to do so. 7667 final int KEY_REPEAT_FIRST_DELAY = 750; 7668 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 7669 } 7670 7671 // Tell mScrollCache when we should start fading. This may 7672 // extend the fade start time if one was already scheduled 7673 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 7674 scrollCache.fadeStartTime = fadeStartTime; 7675 scrollCache.state = ScrollabilityCache.ON; 7676 7677 // Schedule our fader to run, unscheduling any old ones first 7678 if (mAttachInfo != null) { 7679 mAttachInfo.mHandler.removeCallbacks(scrollCache); 7680 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 7681 } 7682 7683 return true; 7684 } 7685 7686 return false; 7687 } 7688 7689 /** 7690 * Mark the the area defined by dirty as needing to be drawn. If the view is 7691 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 7692 * in the future. This must be called from a UI thread. To call from a non-UI 7693 * thread, call {@link #postInvalidate()}. 7694 * 7695 * WARNING: This method is destructive to dirty. 7696 * @param dirty the rectangle representing the bounds of the dirty region 7697 */ 7698 public void invalidate(Rect dirty) { 7699 if (ViewDebug.TRACE_HIERARCHY) { 7700 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 7701 } 7702 7703 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7704 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 7705 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 7706 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7707 mPrivateFlags |= INVALIDATED; 7708 final ViewParent p = mParent; 7709 final AttachInfo ai = mAttachInfo; 7710 //noinspection PointlessBooleanExpression,ConstantConditions 7711 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 7712 if (p != null && ai != null && ai.mHardwareAccelerated) { 7713 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 7714 // with a null dirty rect, which tells the ViewAncestor to redraw everything 7715 p.invalidateChild(this, null); 7716 return; 7717 } 7718 } 7719 if (p != null && ai != null) { 7720 final int scrollX = mScrollX; 7721 final int scrollY = mScrollY; 7722 final Rect r = ai.mTmpInvalRect; 7723 r.set(dirty.left - scrollX, dirty.top - scrollY, 7724 dirty.right - scrollX, dirty.bottom - scrollY); 7725 mParent.invalidateChild(this, r); 7726 } 7727 } 7728 } 7729 7730 /** 7731 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 7732 * The coordinates of the dirty rect are relative to the view. 7733 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 7734 * will be called at some point in the future. This must be called from 7735 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 7736 * @param l the left position of the dirty region 7737 * @param t the top position of the dirty region 7738 * @param r the right position of the dirty region 7739 * @param b the bottom position of the dirty region 7740 */ 7741 public void invalidate(int l, int t, int r, int b) { 7742 if (ViewDebug.TRACE_HIERARCHY) { 7743 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 7744 } 7745 7746 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7747 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 7748 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 7749 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7750 mPrivateFlags |= INVALIDATED; 7751 final ViewParent p = mParent; 7752 final AttachInfo ai = mAttachInfo; 7753 //noinspection PointlessBooleanExpression,ConstantConditions 7754 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 7755 if (p != null && ai != null && ai.mHardwareAccelerated) { 7756 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 7757 // with a null dirty rect, which tells the ViewAncestor to redraw everything 7758 p.invalidateChild(this, null); 7759 return; 7760 } 7761 } 7762 if (p != null && ai != null && l < r && t < b) { 7763 final int scrollX = mScrollX; 7764 final int scrollY = mScrollY; 7765 final Rect tmpr = ai.mTmpInvalRect; 7766 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 7767 p.invalidateChild(this, tmpr); 7768 } 7769 } 7770 } 7771 7772 /** 7773 * Invalidate the whole view. If the view is visible, 7774 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 7775 * the future. This must be called from a UI thread. To call from a non-UI thread, 7776 * call {@link #postInvalidate()}. 7777 */ 7778 public void invalidate() { 7779 invalidate(true); 7780 } 7781 7782 /** 7783 * This is where the invalidate() work actually happens. A full invalidate() 7784 * causes the drawing cache to be invalidated, but this function can be called with 7785 * invalidateCache set to false to skip that invalidation step for cases that do not 7786 * need it (for example, a component that remains at the same dimensions with the same 7787 * content). 7788 * 7789 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 7790 * well. This is usually true for a full invalidate, but may be set to false if the 7791 * View's contents or dimensions have not changed. 7792 */ 7793 void invalidate(boolean invalidateCache) { 7794 if (ViewDebug.TRACE_HIERARCHY) { 7795 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 7796 } 7797 7798 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7799 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 7800 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 7801 mLastIsOpaque = isOpaque(); 7802 mPrivateFlags &= ~DRAWN; 7803 if (invalidateCache) { 7804 mPrivateFlags |= INVALIDATED; 7805 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7806 } 7807 final AttachInfo ai = mAttachInfo; 7808 final ViewParent p = mParent; 7809 //noinspection PointlessBooleanExpression,ConstantConditions 7810 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 7811 if (p != null && ai != null && ai.mHardwareAccelerated) { 7812 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 7813 // with a null dirty rect, which tells the ViewAncestor to redraw everything 7814 p.invalidateChild(this, null); 7815 return; 7816 } 7817 } 7818 7819 if (p != null && ai != null) { 7820 final Rect r = ai.mTmpInvalRect; 7821 r.set(0, 0, mRight - mLeft, mBottom - mTop); 7822 // Don't call invalidate -- we don't want to internally scroll 7823 // our own bounds 7824 p.invalidateChild(this, r); 7825 } 7826 } 7827 } 7828 7829 /** 7830 * @hide 7831 */ 7832 public void fastInvalidate() { 7833 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7834 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 7835 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 7836 if (mParent instanceof View) { 7837 ((View) mParent).mPrivateFlags |= INVALIDATED; 7838 } 7839 mPrivateFlags &= ~DRAWN; 7840 mPrivateFlags |= INVALIDATED; 7841 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7842 if (mParent != null && mAttachInfo != null) { 7843 if (mAttachInfo.mHardwareAccelerated) { 7844 mParent.invalidateChild(this, null); 7845 } else { 7846 final Rect r = mAttachInfo.mTmpInvalRect; 7847 r.set(0, 0, mRight - mLeft, mBottom - mTop); 7848 // Don't call invalidate -- we don't want to internally scroll 7849 // our own bounds 7850 mParent.invalidateChild(this, r); 7851 } 7852 } 7853 } 7854 } 7855 7856 /** 7857 * Used to indicate that the parent of this view should clear its caches. This functionality 7858 * is used to force the parent to rebuild its display list (when hardware-accelerated), 7859 * which is necessary when various parent-managed properties of the view change, such as 7860 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 7861 * clears the parent caches and does not causes an invalidate event. 7862 * 7863 * @hide 7864 */ 7865 protected void invalidateParentCaches() { 7866 if (mParent instanceof View) { 7867 ((View) mParent).mPrivateFlags |= INVALIDATED; 7868 } 7869 } 7870 7871 /** 7872 * Used to indicate that the parent of this view should be invalidated. This functionality 7873 * is used to force the parent to rebuild its display list (when hardware-accelerated), 7874 * which is necessary when various parent-managed properties of the view change, such as 7875 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 7876 * an invalidation event to the parent. 7877 * 7878 * @hide 7879 */ 7880 protected void invalidateParentIfNeeded() { 7881 if (isHardwareAccelerated() && mParent instanceof View) { 7882 ((View) mParent).invalidate(true); 7883 } 7884 } 7885 7886 /** 7887 * Indicates whether this View is opaque. An opaque View guarantees that it will 7888 * draw all the pixels overlapping its bounds using a fully opaque color. 7889 * 7890 * Subclasses of View should override this method whenever possible to indicate 7891 * whether an instance is opaque. Opaque Views are treated in a special way by 7892 * the View hierarchy, possibly allowing it to perform optimizations during 7893 * invalidate/draw passes. 7894 * 7895 * @return True if this View is guaranteed to be fully opaque, false otherwise. 7896 */ 7897 @ViewDebug.ExportedProperty(category = "drawing") 7898 public boolean isOpaque() { 7899 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 7900 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 7901 } 7902 7903 /** 7904 * @hide 7905 */ 7906 protected void computeOpaqueFlags() { 7907 // Opaque if: 7908 // - Has a background 7909 // - Background is opaque 7910 // - Doesn't have scrollbars or scrollbars are inside overlay 7911 7912 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 7913 mPrivateFlags |= OPAQUE_BACKGROUND; 7914 } else { 7915 mPrivateFlags &= ~OPAQUE_BACKGROUND; 7916 } 7917 7918 final int flags = mViewFlags; 7919 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 7920 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 7921 mPrivateFlags |= OPAQUE_SCROLLBARS; 7922 } else { 7923 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 7924 } 7925 } 7926 7927 /** 7928 * @hide 7929 */ 7930 protected boolean hasOpaqueScrollbars() { 7931 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 7932 } 7933 7934 /** 7935 * @return A handler associated with the thread running the View. This 7936 * handler can be used to pump events in the UI events queue. 7937 */ 7938 public Handler getHandler() { 7939 if (mAttachInfo != null) { 7940 return mAttachInfo.mHandler; 7941 } 7942 return null; 7943 } 7944 7945 /** 7946 * Causes the Runnable to be added to the message queue. 7947 * The runnable will be run on the user interface thread. 7948 * 7949 * @param action The Runnable that will be executed. 7950 * 7951 * @return Returns true if the Runnable was successfully placed in to the 7952 * message queue. Returns false on failure, usually because the 7953 * looper processing the message queue is exiting. 7954 */ 7955 public boolean post(Runnable action) { 7956 Handler handler; 7957 AttachInfo attachInfo = mAttachInfo; 7958 if (attachInfo != null) { 7959 handler = attachInfo.mHandler; 7960 } else { 7961 // Assume that post will succeed later 7962 ViewAncestor.getRunQueue().post(action); 7963 return true; 7964 } 7965 7966 return handler.post(action); 7967 } 7968 7969 /** 7970 * Causes the Runnable to be added to the message queue, to be run 7971 * after the specified amount of time elapses. 7972 * The runnable will be run on the user interface thread. 7973 * 7974 * @param action The Runnable that will be executed. 7975 * @param delayMillis The delay (in milliseconds) until the Runnable 7976 * will be executed. 7977 * 7978 * @return true if the Runnable was successfully placed in to the 7979 * message queue. Returns false on failure, usually because the 7980 * looper processing the message queue is exiting. Note that a 7981 * result of true does not mean the Runnable will be processed -- 7982 * if the looper is quit before the delivery time of the message 7983 * occurs then the message will be dropped. 7984 */ 7985 public boolean postDelayed(Runnable action, long delayMillis) { 7986 Handler handler; 7987 AttachInfo attachInfo = mAttachInfo; 7988 if (attachInfo != null) { 7989 handler = attachInfo.mHandler; 7990 } else { 7991 // Assume that post will succeed later 7992 ViewAncestor.getRunQueue().postDelayed(action, delayMillis); 7993 return true; 7994 } 7995 7996 return handler.postDelayed(action, delayMillis); 7997 } 7998 7999 /** 8000 * Removes the specified Runnable from the message queue. 8001 * 8002 * @param action The Runnable to remove from the message handling queue 8003 * 8004 * @return true if this view could ask the Handler to remove the Runnable, 8005 * false otherwise. When the returned value is true, the Runnable 8006 * may or may not have been actually removed from the message queue 8007 * (for instance, if the Runnable was not in the queue already.) 8008 */ 8009 public boolean removeCallbacks(Runnable action) { 8010 Handler handler; 8011 AttachInfo attachInfo = mAttachInfo; 8012 if (attachInfo != null) { 8013 handler = attachInfo.mHandler; 8014 } else { 8015 // Assume that post will succeed later 8016 ViewAncestor.getRunQueue().removeCallbacks(action); 8017 return true; 8018 } 8019 8020 handler.removeCallbacks(action); 8021 return true; 8022 } 8023 8024 /** 8025 * Cause an invalidate to happen on a subsequent cycle through the event loop. 8026 * Use this to invalidate the View from a non-UI thread. 8027 * 8028 * @see #invalidate() 8029 */ 8030 public void postInvalidate() { 8031 postInvalidateDelayed(0); 8032 } 8033 8034 /** 8035 * Cause an invalidate of the specified area to happen on a subsequent cycle 8036 * through the event loop. Use this to invalidate the View from a non-UI thread. 8037 * 8038 * @param left The left coordinate of the rectangle to invalidate. 8039 * @param top The top coordinate of the rectangle to invalidate. 8040 * @param right The right coordinate of the rectangle to invalidate. 8041 * @param bottom The bottom coordinate of the rectangle to invalidate. 8042 * 8043 * @see #invalidate(int, int, int, int) 8044 * @see #invalidate(Rect) 8045 */ 8046 public void postInvalidate(int left, int top, int right, int bottom) { 8047 postInvalidateDelayed(0, left, top, right, bottom); 8048 } 8049 8050 /** 8051 * Cause an invalidate to happen on a subsequent cycle through the event 8052 * loop. Waits for the specified amount of time. 8053 * 8054 * @param delayMilliseconds the duration in milliseconds to delay the 8055 * invalidation by 8056 */ 8057 public void postInvalidateDelayed(long delayMilliseconds) { 8058 // We try only with the AttachInfo because there's no point in invalidating 8059 // if we are not attached to our window 8060 AttachInfo attachInfo = mAttachInfo; 8061 if (attachInfo != null) { 8062 Message msg = Message.obtain(); 8063 msg.what = AttachInfo.INVALIDATE_MSG; 8064 msg.obj = this; 8065 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8066 } 8067 } 8068 8069 /** 8070 * Cause an invalidate of the specified area to happen on a subsequent cycle 8071 * through the event loop. Waits for the specified amount of time. 8072 * 8073 * @param delayMilliseconds the duration in milliseconds to delay the 8074 * invalidation by 8075 * @param left The left coordinate of the rectangle to invalidate. 8076 * @param top The top coordinate of the rectangle to invalidate. 8077 * @param right The right coordinate of the rectangle to invalidate. 8078 * @param bottom The bottom coordinate of the rectangle to invalidate. 8079 */ 8080 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8081 int right, int bottom) { 8082 8083 // We try only with the AttachInfo because there's no point in invalidating 8084 // if we are not attached to our window 8085 AttachInfo attachInfo = mAttachInfo; 8086 if (attachInfo != null) { 8087 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8088 info.target = this; 8089 info.left = left; 8090 info.top = top; 8091 info.right = right; 8092 info.bottom = bottom; 8093 8094 final Message msg = Message.obtain(); 8095 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 8096 msg.obj = info; 8097 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8098 } 8099 } 8100 8101 /** 8102 * Called by a parent to request that a child update its values for mScrollX 8103 * and mScrollY if necessary. This will typically be done if the child is 8104 * animating a scroll using a {@link android.widget.Scroller Scroller} 8105 * object. 8106 */ 8107 public void computeScroll() { 8108 } 8109 8110 /** 8111 * <p>Indicate whether the horizontal edges are faded when the view is 8112 * scrolled horizontally.</p> 8113 * 8114 * @return true if the horizontal edges should are faded on scroll, false 8115 * otherwise 8116 * 8117 * @see #setHorizontalFadingEdgeEnabled(boolean) 8118 * @attr ref android.R.styleable#View_fadingEdge 8119 */ 8120 public boolean isHorizontalFadingEdgeEnabled() { 8121 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 8122 } 8123 8124 /** 8125 * <p>Define whether the horizontal edges should be faded when this view 8126 * is scrolled horizontally.</p> 8127 * 8128 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 8129 * be faded when the view is scrolled 8130 * horizontally 8131 * 8132 * @see #isHorizontalFadingEdgeEnabled() 8133 * @attr ref android.R.styleable#View_fadingEdge 8134 */ 8135 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 8136 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 8137 if (horizontalFadingEdgeEnabled) { 8138 initScrollCache(); 8139 } 8140 8141 mViewFlags ^= FADING_EDGE_HORIZONTAL; 8142 } 8143 } 8144 8145 /** 8146 * <p>Indicate whether the vertical edges are faded when the view is 8147 * scrolled horizontally.</p> 8148 * 8149 * @return true if the vertical edges should are faded on scroll, false 8150 * otherwise 8151 * 8152 * @see #setVerticalFadingEdgeEnabled(boolean) 8153 * @attr ref android.R.styleable#View_fadingEdge 8154 */ 8155 public boolean isVerticalFadingEdgeEnabled() { 8156 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 8157 } 8158 8159 /** 8160 * <p>Define whether the vertical edges should be faded when this view 8161 * is scrolled vertically.</p> 8162 * 8163 * @param verticalFadingEdgeEnabled true if the vertical edges should 8164 * be faded when the view is scrolled 8165 * vertically 8166 * 8167 * @see #isVerticalFadingEdgeEnabled() 8168 * @attr ref android.R.styleable#View_fadingEdge 8169 */ 8170 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 8171 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 8172 if (verticalFadingEdgeEnabled) { 8173 initScrollCache(); 8174 } 8175 8176 mViewFlags ^= FADING_EDGE_VERTICAL; 8177 } 8178 } 8179 8180 /** 8181 * Returns the strength, or intensity, of the top faded edge. The strength is 8182 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8183 * returns 0.0 or 1.0 but no value in between. 8184 * 8185 * Subclasses should override this method to provide a smoother fade transition 8186 * when scrolling occurs. 8187 * 8188 * @return the intensity of the top fade as a float between 0.0f and 1.0f 8189 */ 8190 protected float getTopFadingEdgeStrength() { 8191 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 8192 } 8193 8194 /** 8195 * Returns the strength, or intensity, of the bottom faded edge. The strength is 8196 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8197 * returns 0.0 or 1.0 but no value in between. 8198 * 8199 * Subclasses should override this method to provide a smoother fade transition 8200 * when scrolling occurs. 8201 * 8202 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 8203 */ 8204 protected float getBottomFadingEdgeStrength() { 8205 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 8206 computeVerticalScrollRange() ? 1.0f : 0.0f; 8207 } 8208 8209 /** 8210 * Returns the strength, or intensity, of the left faded edge. The strength is 8211 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8212 * returns 0.0 or 1.0 but no value in between. 8213 * 8214 * Subclasses should override this method to provide a smoother fade transition 8215 * when scrolling occurs. 8216 * 8217 * @return the intensity of the left fade as a float between 0.0f and 1.0f 8218 */ 8219 protected float getLeftFadingEdgeStrength() { 8220 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 8221 } 8222 8223 /** 8224 * Returns the strength, or intensity, of the right faded edge. The strength is 8225 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8226 * returns 0.0 or 1.0 but no value in between. 8227 * 8228 * Subclasses should override this method to provide a smoother fade transition 8229 * when scrolling occurs. 8230 * 8231 * @return the intensity of the right fade as a float between 0.0f and 1.0f 8232 */ 8233 protected float getRightFadingEdgeStrength() { 8234 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 8235 computeHorizontalScrollRange() ? 1.0f : 0.0f; 8236 } 8237 8238 /** 8239 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 8240 * scrollbar is not drawn by default.</p> 8241 * 8242 * @return true if the horizontal scrollbar should be painted, false 8243 * otherwise 8244 * 8245 * @see #setHorizontalScrollBarEnabled(boolean) 8246 */ 8247 public boolean isHorizontalScrollBarEnabled() { 8248 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 8249 } 8250 8251 /** 8252 * <p>Define whether the horizontal scrollbar should be drawn or not. The 8253 * scrollbar is not drawn by default.</p> 8254 * 8255 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 8256 * be painted 8257 * 8258 * @see #isHorizontalScrollBarEnabled() 8259 */ 8260 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 8261 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 8262 mViewFlags ^= SCROLLBARS_HORIZONTAL; 8263 computeOpaqueFlags(); 8264 recomputePadding(); 8265 } 8266 } 8267 8268 /** 8269 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 8270 * scrollbar is not drawn by default.</p> 8271 * 8272 * @return true if the vertical scrollbar should be painted, false 8273 * otherwise 8274 * 8275 * @see #setVerticalScrollBarEnabled(boolean) 8276 */ 8277 public boolean isVerticalScrollBarEnabled() { 8278 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 8279 } 8280 8281 /** 8282 * <p>Define whether the vertical scrollbar should be drawn or not. The 8283 * scrollbar is not drawn by default.</p> 8284 * 8285 * @param verticalScrollBarEnabled true if the vertical scrollbar should 8286 * be painted 8287 * 8288 * @see #isVerticalScrollBarEnabled() 8289 */ 8290 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 8291 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 8292 mViewFlags ^= SCROLLBARS_VERTICAL; 8293 computeOpaqueFlags(); 8294 recomputePadding(); 8295 } 8296 } 8297 8298 /** 8299 * @hide 8300 */ 8301 protected void recomputePadding() { 8302 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 8303 } 8304 8305 /** 8306 * Define whether scrollbars will fade when the view is not scrolling. 8307 * 8308 * @param fadeScrollbars wheter to enable fading 8309 * 8310 */ 8311 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 8312 initScrollCache(); 8313 final ScrollabilityCache scrollabilityCache = mScrollCache; 8314 scrollabilityCache.fadeScrollBars = fadeScrollbars; 8315 if (fadeScrollbars) { 8316 scrollabilityCache.state = ScrollabilityCache.OFF; 8317 } else { 8318 scrollabilityCache.state = ScrollabilityCache.ON; 8319 } 8320 } 8321 8322 /** 8323 * 8324 * Returns true if scrollbars will fade when this view is not scrolling 8325 * 8326 * @return true if scrollbar fading is enabled 8327 */ 8328 public boolean isScrollbarFadingEnabled() { 8329 return mScrollCache != null && mScrollCache.fadeScrollBars; 8330 } 8331 8332 /** 8333 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 8334 * inset. When inset, they add to the padding of the view. And the scrollbars 8335 * can be drawn inside the padding area or on the edge of the view. For example, 8336 * if a view has a background drawable and you want to draw the scrollbars 8337 * inside the padding specified by the drawable, you can use 8338 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 8339 * appear at the edge of the view, ignoring the padding, then you can use 8340 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 8341 * @param style the style of the scrollbars. Should be one of 8342 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 8343 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 8344 * @see #SCROLLBARS_INSIDE_OVERLAY 8345 * @see #SCROLLBARS_INSIDE_INSET 8346 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8347 * @see #SCROLLBARS_OUTSIDE_INSET 8348 */ 8349 public void setScrollBarStyle(int style) { 8350 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 8351 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 8352 computeOpaqueFlags(); 8353 recomputePadding(); 8354 } 8355 } 8356 8357 /** 8358 * <p>Returns the current scrollbar style.</p> 8359 * @return the current scrollbar style 8360 * @see #SCROLLBARS_INSIDE_OVERLAY 8361 * @see #SCROLLBARS_INSIDE_INSET 8362 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8363 * @see #SCROLLBARS_OUTSIDE_INSET 8364 */ 8365 public int getScrollBarStyle() { 8366 return mViewFlags & SCROLLBARS_STYLE_MASK; 8367 } 8368 8369 /** 8370 * <p>Compute the horizontal range that the horizontal scrollbar 8371 * represents.</p> 8372 * 8373 * <p>The range is expressed in arbitrary units that must be the same as the 8374 * units used by {@link #computeHorizontalScrollExtent()} and 8375 * {@link #computeHorizontalScrollOffset()}.</p> 8376 * 8377 * <p>The default range is the drawing width of this view.</p> 8378 * 8379 * @return the total horizontal range represented by the horizontal 8380 * scrollbar 8381 * 8382 * @see #computeHorizontalScrollExtent() 8383 * @see #computeHorizontalScrollOffset() 8384 * @see android.widget.ScrollBarDrawable 8385 */ 8386 protected int computeHorizontalScrollRange() { 8387 return getWidth(); 8388 } 8389 8390 /** 8391 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 8392 * within the horizontal range. This value is used to compute the position 8393 * of the thumb within the scrollbar's track.</p> 8394 * 8395 * <p>The range is expressed in arbitrary units that must be the same as the 8396 * units used by {@link #computeHorizontalScrollRange()} and 8397 * {@link #computeHorizontalScrollExtent()}.</p> 8398 * 8399 * <p>The default offset is the scroll offset of this view.</p> 8400 * 8401 * @return the horizontal offset of the scrollbar's thumb 8402 * 8403 * @see #computeHorizontalScrollRange() 8404 * @see #computeHorizontalScrollExtent() 8405 * @see android.widget.ScrollBarDrawable 8406 */ 8407 protected int computeHorizontalScrollOffset() { 8408 return mScrollX; 8409 } 8410 8411 /** 8412 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 8413 * within the horizontal range. This value is used to compute the length 8414 * of the thumb within the scrollbar's track.</p> 8415 * 8416 * <p>The range is expressed in arbitrary units that must be the same as the 8417 * units used by {@link #computeHorizontalScrollRange()} and 8418 * {@link #computeHorizontalScrollOffset()}.</p> 8419 * 8420 * <p>The default extent is the drawing width of this view.</p> 8421 * 8422 * @return the horizontal extent of the scrollbar's thumb 8423 * 8424 * @see #computeHorizontalScrollRange() 8425 * @see #computeHorizontalScrollOffset() 8426 * @see android.widget.ScrollBarDrawable 8427 */ 8428 protected int computeHorizontalScrollExtent() { 8429 return getWidth(); 8430 } 8431 8432 /** 8433 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 8434 * 8435 * <p>The range is expressed in arbitrary units that must be the same as the 8436 * units used by {@link #computeVerticalScrollExtent()} and 8437 * {@link #computeVerticalScrollOffset()}.</p> 8438 * 8439 * @return the total vertical range represented by the vertical scrollbar 8440 * 8441 * <p>The default range is the drawing height of this view.</p> 8442 * 8443 * @see #computeVerticalScrollExtent() 8444 * @see #computeVerticalScrollOffset() 8445 * @see android.widget.ScrollBarDrawable 8446 */ 8447 protected int computeVerticalScrollRange() { 8448 return getHeight(); 8449 } 8450 8451 /** 8452 * <p>Compute the vertical offset of the vertical scrollbar's thumb 8453 * within the horizontal range. This value is used to compute the position 8454 * of the thumb within the scrollbar's track.</p> 8455 * 8456 * <p>The range is expressed in arbitrary units that must be the same as the 8457 * units used by {@link #computeVerticalScrollRange()} and 8458 * {@link #computeVerticalScrollExtent()}.</p> 8459 * 8460 * <p>The default offset is the scroll offset of this view.</p> 8461 * 8462 * @return the vertical offset of the scrollbar's thumb 8463 * 8464 * @see #computeVerticalScrollRange() 8465 * @see #computeVerticalScrollExtent() 8466 * @see android.widget.ScrollBarDrawable 8467 */ 8468 protected int computeVerticalScrollOffset() { 8469 return mScrollY; 8470 } 8471 8472 /** 8473 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 8474 * within the vertical range. This value is used to compute the length 8475 * of the thumb within the scrollbar's track.</p> 8476 * 8477 * <p>The range is expressed in arbitrary units that must be the same as the 8478 * units used by {@link #computeVerticalScrollRange()} and 8479 * {@link #computeVerticalScrollOffset()}.</p> 8480 * 8481 * <p>The default extent is the drawing height of this view.</p> 8482 * 8483 * @return the vertical extent of the scrollbar's thumb 8484 * 8485 * @see #computeVerticalScrollRange() 8486 * @see #computeVerticalScrollOffset() 8487 * @see android.widget.ScrollBarDrawable 8488 */ 8489 protected int computeVerticalScrollExtent() { 8490 return getHeight(); 8491 } 8492 8493 /** 8494 * Check if this view can be scrolled horizontally in a certain direction. 8495 * 8496 * @param direction Negative to check scrolling left, positive to check scrolling right. 8497 * @return true if this view can be scrolled in the specified direction, false otherwise. 8498 */ 8499 public boolean canScrollHorizontally(int direction) { 8500 final int offset = computeHorizontalScrollOffset(); 8501 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 8502 if (range == 0) return false; 8503 if (direction < 0) { 8504 return offset > 0; 8505 } else { 8506 return offset < range - 1; 8507 } 8508 } 8509 8510 /** 8511 * Check if this view can be scrolled vertically in a certain direction. 8512 * 8513 * @param direction Negative to check scrolling up, positive to check scrolling down. 8514 * @return true if this view can be scrolled in the specified direction, false otherwise. 8515 */ 8516 public boolean canScrollVertically(int direction) { 8517 final int offset = computeVerticalScrollOffset(); 8518 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 8519 if (range == 0) return false; 8520 if (direction < 0) { 8521 return offset > 0; 8522 } else { 8523 return offset < range - 1; 8524 } 8525 } 8526 8527 /** 8528 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 8529 * scrollbars are painted only if they have been awakened first.</p> 8530 * 8531 * @param canvas the canvas on which to draw the scrollbars 8532 * 8533 * @see #awakenScrollBars(int) 8534 */ 8535 protected final void onDrawScrollBars(Canvas canvas) { 8536 // scrollbars are drawn only when the animation is running 8537 final ScrollabilityCache cache = mScrollCache; 8538 if (cache != null) { 8539 8540 int state = cache.state; 8541 8542 if (state == ScrollabilityCache.OFF) { 8543 return; 8544 } 8545 8546 boolean invalidate = false; 8547 8548 if (state == ScrollabilityCache.FADING) { 8549 // We're fading -- get our fade interpolation 8550 if (cache.interpolatorValues == null) { 8551 cache.interpolatorValues = new float[1]; 8552 } 8553 8554 float[] values = cache.interpolatorValues; 8555 8556 // Stops the animation if we're done 8557 if (cache.scrollBarInterpolator.timeToValues(values) == 8558 Interpolator.Result.FREEZE_END) { 8559 cache.state = ScrollabilityCache.OFF; 8560 } else { 8561 cache.scrollBar.setAlpha(Math.round(values[0])); 8562 } 8563 8564 // This will make the scroll bars inval themselves after 8565 // drawing. We only want this when we're fading so that 8566 // we prevent excessive redraws 8567 invalidate = true; 8568 } else { 8569 // We're just on -- but we may have been fading before so 8570 // reset alpha 8571 cache.scrollBar.setAlpha(255); 8572 } 8573 8574 8575 final int viewFlags = mViewFlags; 8576 8577 final boolean drawHorizontalScrollBar = 8578 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 8579 final boolean drawVerticalScrollBar = 8580 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 8581 && !isVerticalScrollBarHidden(); 8582 8583 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 8584 final int width = mRight - mLeft; 8585 final int height = mBottom - mTop; 8586 8587 final ScrollBarDrawable scrollBar = cache.scrollBar; 8588 8589 final int scrollX = mScrollX; 8590 final int scrollY = mScrollY; 8591 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 8592 8593 int left, top, right, bottom; 8594 8595 if (drawHorizontalScrollBar) { 8596 int size = scrollBar.getSize(false); 8597 if (size <= 0) { 8598 size = cache.scrollBarSize; 8599 } 8600 8601 scrollBar.setParameters(computeHorizontalScrollRange(), 8602 computeHorizontalScrollOffset(), 8603 computeHorizontalScrollExtent(), false); 8604 final int verticalScrollBarGap = drawVerticalScrollBar ? 8605 getVerticalScrollbarWidth() : 0; 8606 top = scrollY + height - size - (mUserPaddingBottom & inside); 8607 left = scrollX + (mPaddingLeft & inside); 8608 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 8609 bottom = top + size; 8610 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 8611 if (invalidate) { 8612 invalidate(left, top, right, bottom); 8613 } 8614 } 8615 8616 if (drawVerticalScrollBar) { 8617 int size = scrollBar.getSize(true); 8618 if (size <= 0) { 8619 size = cache.scrollBarSize; 8620 } 8621 8622 scrollBar.setParameters(computeVerticalScrollRange(), 8623 computeVerticalScrollOffset(), 8624 computeVerticalScrollExtent(), true); 8625 switch (mVerticalScrollbarPosition) { 8626 default: 8627 case SCROLLBAR_POSITION_DEFAULT: 8628 case SCROLLBAR_POSITION_RIGHT: 8629 left = scrollX + width - size - (mUserPaddingRight & inside); 8630 break; 8631 case SCROLLBAR_POSITION_LEFT: 8632 left = scrollX + (mUserPaddingLeft & inside); 8633 break; 8634 } 8635 top = scrollY + (mPaddingTop & inside); 8636 right = left + size; 8637 bottom = scrollY + height - (mUserPaddingBottom & inside); 8638 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 8639 if (invalidate) { 8640 invalidate(left, top, right, bottom); 8641 } 8642 } 8643 } 8644 } 8645 } 8646 8647 /** 8648 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 8649 * FastScroller is visible. 8650 * @return whether to temporarily hide the vertical scrollbar 8651 * @hide 8652 */ 8653 protected boolean isVerticalScrollBarHidden() { 8654 return false; 8655 } 8656 8657 /** 8658 * <p>Draw the horizontal scrollbar if 8659 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 8660 * 8661 * @param canvas the canvas on which to draw the scrollbar 8662 * @param scrollBar the scrollbar's drawable 8663 * 8664 * @see #isHorizontalScrollBarEnabled() 8665 * @see #computeHorizontalScrollRange() 8666 * @see #computeHorizontalScrollExtent() 8667 * @see #computeHorizontalScrollOffset() 8668 * @see android.widget.ScrollBarDrawable 8669 * @hide 8670 */ 8671 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 8672 int l, int t, int r, int b) { 8673 scrollBar.setBounds(l, t, r, b); 8674 scrollBar.draw(canvas); 8675 } 8676 8677 /** 8678 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 8679 * returns true.</p> 8680 * 8681 * @param canvas the canvas on which to draw the scrollbar 8682 * @param scrollBar the scrollbar's drawable 8683 * 8684 * @see #isVerticalScrollBarEnabled() 8685 * @see #computeVerticalScrollRange() 8686 * @see #computeVerticalScrollExtent() 8687 * @see #computeVerticalScrollOffset() 8688 * @see android.widget.ScrollBarDrawable 8689 * @hide 8690 */ 8691 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 8692 int l, int t, int r, int b) { 8693 scrollBar.setBounds(l, t, r, b); 8694 scrollBar.draw(canvas); 8695 } 8696 8697 /** 8698 * Implement this to do your drawing. 8699 * 8700 * @param canvas the canvas on which the background will be drawn 8701 */ 8702 protected void onDraw(Canvas canvas) { 8703 } 8704 8705 /* 8706 * Caller is responsible for calling requestLayout if necessary. 8707 * (This allows addViewInLayout to not request a new layout.) 8708 */ 8709 void assignParent(ViewParent parent) { 8710 if (mParent == null) { 8711 mParent = parent; 8712 } else if (parent == null) { 8713 mParent = null; 8714 } else { 8715 throw new RuntimeException("view " + this + " being added, but" 8716 + " it already has a parent"); 8717 } 8718 } 8719 8720 /** 8721 * This is called when the view is attached to a window. At this point it 8722 * has a Surface and will start drawing. Note that this function is 8723 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 8724 * however it may be called any time before the first onDraw -- including 8725 * before or after {@link #onMeasure(int, int)}. 8726 * 8727 * @see #onDetachedFromWindow() 8728 */ 8729 protected void onAttachedToWindow() { 8730 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 8731 mParent.requestTransparentRegion(this); 8732 } 8733 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 8734 initialAwakenScrollBars(); 8735 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 8736 } 8737 jumpDrawablesToCurrentState(); 8738 resolveLayoutDirection(); 8739 } 8740 8741 /** 8742 * Resolving the layout direction. LTR is set initially. 8743 * We are supposing here that the parent directionality will be resolved before its children. 8744 */ 8745 private void resolveLayoutDirection() { 8746 mPrivateFlags2 &= ~RESOLVED_LAYOUT_RTL; 8747 switch (getLayoutDirection()) { 8748 case LAYOUT_DIRECTION_INHERIT: 8749 // If this is root view, no need to look at parent's layout dir. 8750 if (mParent != null && 8751 mParent instanceof ViewGroup && 8752 ((ViewGroup) mParent).getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 8753 mPrivateFlags2 |= RESOLVED_LAYOUT_RTL; 8754 } 8755 break; 8756 case LAYOUT_DIRECTION_RTL: 8757 mPrivateFlags2 |= RESOLVED_LAYOUT_RTL; 8758 break; 8759 case LAYOUT_DIRECTION_LOCALE: 8760 if(isLayoutDirectionRtl(Locale.getDefault())) { 8761 mPrivateFlags2 |= RESOLVED_LAYOUT_RTL; 8762 } 8763 break; 8764 default: 8765 // Nothing to do, LTR by default 8766 } 8767 } 8768 8769 /** 8770 * Check if a Locale is corresponding to a RTL script. 8771 * 8772 * @param locale Locale to check 8773 * @return true if a Locale is corresponding to a RTL script. 8774 */ 8775 private static boolean isLayoutDirectionRtl(Locale locale) { 8776 return (LocaleUtil.TEXT_LAYOUT_DIRECTION_RTL_DO_NOT_USE == 8777 LocaleUtil.getLayoutDirectionFromLocale(locale)); 8778 } 8779 8780 /** 8781 * This is called when the view is detached from a window. At this point it 8782 * no longer has a surface for drawing. 8783 * 8784 * @see #onAttachedToWindow() 8785 */ 8786 protected void onDetachedFromWindow() { 8787 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 8788 8789 removeUnsetPressCallback(); 8790 removeLongPressCallback(); 8791 removePerformClickCallback(); 8792 8793 destroyDrawingCache(); 8794 8795 if (mHardwareLayer != null) { 8796 mHardwareLayer.destroy(); 8797 mHardwareLayer = null; 8798 } 8799 8800 if (mDisplayList != null) { 8801 mDisplayList.invalidate(); 8802 } 8803 8804 if (mAttachInfo != null) { 8805 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 8806 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_RECT_MSG, this); 8807 } 8808 8809 mCurrentAnimation = null; 8810 } 8811 8812 /** 8813 * @return The number of times this view has been attached to a window 8814 */ 8815 protected int getWindowAttachCount() { 8816 return mWindowAttachCount; 8817 } 8818 8819 /** 8820 * Retrieve a unique token identifying the window this view is attached to. 8821 * @return Return the window's token for use in 8822 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 8823 */ 8824 public IBinder getWindowToken() { 8825 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 8826 } 8827 8828 /** 8829 * Retrieve a unique token identifying the top-level "real" window of 8830 * the window that this view is attached to. That is, this is like 8831 * {@link #getWindowToken}, except if the window this view in is a panel 8832 * window (attached to another containing window), then the token of 8833 * the containing window is returned instead. 8834 * 8835 * @return Returns the associated window token, either 8836 * {@link #getWindowToken()} or the containing window's token. 8837 */ 8838 public IBinder getApplicationWindowToken() { 8839 AttachInfo ai = mAttachInfo; 8840 if (ai != null) { 8841 IBinder appWindowToken = ai.mPanelParentWindowToken; 8842 if (appWindowToken == null) { 8843 appWindowToken = ai.mWindowToken; 8844 } 8845 return appWindowToken; 8846 } 8847 return null; 8848 } 8849 8850 /** 8851 * Retrieve private session object this view hierarchy is using to 8852 * communicate with the window manager. 8853 * @return the session object to communicate with the window manager 8854 */ 8855 /*package*/ IWindowSession getWindowSession() { 8856 return mAttachInfo != null ? mAttachInfo.mSession : null; 8857 } 8858 8859 /** 8860 * @param info the {@link android.view.View.AttachInfo} to associated with 8861 * this view 8862 */ 8863 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 8864 //System.out.println("Attached! " + this); 8865 mAttachInfo = info; 8866 mWindowAttachCount++; 8867 // We will need to evaluate the drawable state at least once. 8868 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 8869 if (mFloatingTreeObserver != null) { 8870 info.mTreeObserver.merge(mFloatingTreeObserver); 8871 mFloatingTreeObserver = null; 8872 } 8873 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 8874 mAttachInfo.mScrollContainers.add(this); 8875 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 8876 } 8877 performCollectViewAttributes(visibility); 8878 onAttachedToWindow(); 8879 8880 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 8881 mOnAttachStateChangeListeners; 8882 if (listeners != null && listeners.size() > 0) { 8883 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 8884 // perform the dispatching. The iterator is a safe guard against listeners that 8885 // could mutate the list by calling the various add/remove methods. This prevents 8886 // the array from being modified while we iterate it. 8887 for (OnAttachStateChangeListener listener : listeners) { 8888 listener.onViewAttachedToWindow(this); 8889 } 8890 } 8891 8892 int vis = info.mWindowVisibility; 8893 if (vis != GONE) { 8894 onWindowVisibilityChanged(vis); 8895 } 8896 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 8897 // If nobody has evaluated the drawable state yet, then do it now. 8898 refreshDrawableState(); 8899 } 8900 } 8901 8902 void dispatchDetachedFromWindow() { 8903 AttachInfo info = mAttachInfo; 8904 if (info != null) { 8905 int vis = info.mWindowVisibility; 8906 if (vis != GONE) { 8907 onWindowVisibilityChanged(GONE); 8908 } 8909 } 8910 8911 onDetachedFromWindow(); 8912 8913 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 8914 mOnAttachStateChangeListeners; 8915 if (listeners != null && listeners.size() > 0) { 8916 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 8917 // perform the dispatching. The iterator is a safe guard against listeners that 8918 // could mutate the list by calling the various add/remove methods. This prevents 8919 // the array from being modified while we iterate it. 8920 for (OnAttachStateChangeListener listener : listeners) { 8921 listener.onViewDetachedFromWindow(this); 8922 } 8923 } 8924 8925 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 8926 mAttachInfo.mScrollContainers.remove(this); 8927 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 8928 } 8929 8930 mAttachInfo = null; 8931 } 8932 8933 /** 8934 * Store this view hierarchy's frozen state into the given container. 8935 * 8936 * @param container The SparseArray in which to save the view's state. 8937 * 8938 * @see #restoreHierarchyState(android.util.SparseArray) 8939 * @see #dispatchSaveInstanceState(android.util.SparseArray) 8940 * @see #onSaveInstanceState() 8941 */ 8942 public void saveHierarchyState(SparseArray<Parcelable> container) { 8943 dispatchSaveInstanceState(container); 8944 } 8945 8946 /** 8947 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 8948 * this view and its children. May be overridden to modify how freezing happens to a 8949 * view's children; for example, some views may want to not store state for their children. 8950 * 8951 * @param container The SparseArray in which to save the view's state. 8952 * 8953 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 8954 * @see #saveHierarchyState(android.util.SparseArray) 8955 * @see #onSaveInstanceState() 8956 */ 8957 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 8958 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 8959 mPrivateFlags &= ~SAVE_STATE_CALLED; 8960 Parcelable state = onSaveInstanceState(); 8961 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 8962 throw new IllegalStateException( 8963 "Derived class did not call super.onSaveInstanceState()"); 8964 } 8965 if (state != null) { 8966 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 8967 // + ": " + state); 8968 container.put(mID, state); 8969 } 8970 } 8971 } 8972 8973 /** 8974 * Hook allowing a view to generate a representation of its internal state 8975 * that can later be used to create a new instance with that same state. 8976 * This state should only contain information that is not persistent or can 8977 * not be reconstructed later. For example, you will never store your 8978 * current position on screen because that will be computed again when a 8979 * new instance of the view is placed in its view hierarchy. 8980 * <p> 8981 * Some examples of things you may store here: the current cursor position 8982 * in a text view (but usually not the text itself since that is stored in a 8983 * content provider or other persistent storage), the currently selected 8984 * item in a list view. 8985 * 8986 * @return Returns a Parcelable object containing the view's current dynamic 8987 * state, or null if there is nothing interesting to save. The 8988 * default implementation returns null. 8989 * @see #onRestoreInstanceState(android.os.Parcelable) 8990 * @see #saveHierarchyState(android.util.SparseArray) 8991 * @see #dispatchSaveInstanceState(android.util.SparseArray) 8992 * @see #setSaveEnabled(boolean) 8993 */ 8994 protected Parcelable onSaveInstanceState() { 8995 mPrivateFlags |= SAVE_STATE_CALLED; 8996 return BaseSavedState.EMPTY_STATE; 8997 } 8998 8999 /** 9000 * Restore this view hierarchy's frozen state from the given container. 9001 * 9002 * @param container The SparseArray which holds previously frozen states. 9003 * 9004 * @see #saveHierarchyState(android.util.SparseArray) 9005 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9006 * @see #onRestoreInstanceState(android.os.Parcelable) 9007 */ 9008 public void restoreHierarchyState(SparseArray<Parcelable> container) { 9009 dispatchRestoreInstanceState(container); 9010 } 9011 9012 /** 9013 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 9014 * state for this view and its children. May be overridden to modify how restoring 9015 * happens to a view's children; for example, some views may want to not store state 9016 * for their children. 9017 * 9018 * @param container The SparseArray which holds previously saved state. 9019 * 9020 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9021 * @see #restoreHierarchyState(android.util.SparseArray) 9022 * @see #onRestoreInstanceState(android.os.Parcelable) 9023 */ 9024 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 9025 if (mID != NO_ID) { 9026 Parcelable state = container.get(mID); 9027 if (state != null) { 9028 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 9029 // + ": " + state); 9030 mPrivateFlags &= ~SAVE_STATE_CALLED; 9031 onRestoreInstanceState(state); 9032 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9033 throw new IllegalStateException( 9034 "Derived class did not call super.onRestoreInstanceState()"); 9035 } 9036 } 9037 } 9038 } 9039 9040 /** 9041 * Hook allowing a view to re-apply a representation of its internal state that had previously 9042 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 9043 * null state. 9044 * 9045 * @param state The frozen state that had previously been returned by 9046 * {@link #onSaveInstanceState}. 9047 * 9048 * @see #onSaveInstanceState() 9049 * @see #restoreHierarchyState(android.util.SparseArray) 9050 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9051 */ 9052 protected void onRestoreInstanceState(Parcelable state) { 9053 mPrivateFlags |= SAVE_STATE_CALLED; 9054 if (state != BaseSavedState.EMPTY_STATE && state != null) { 9055 throw new IllegalArgumentException("Wrong state class, expecting View State but " 9056 + "received " + state.getClass().toString() + " instead. This usually happens " 9057 + "when two views of different type have the same id in the same hierarchy. " 9058 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 9059 + "other views do not use the same id."); 9060 } 9061 } 9062 9063 /** 9064 * <p>Return the time at which the drawing of the view hierarchy started.</p> 9065 * 9066 * @return the drawing start time in milliseconds 9067 */ 9068 public long getDrawingTime() { 9069 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 9070 } 9071 9072 /** 9073 * <p>Enables or disables the duplication of the parent's state into this view. When 9074 * duplication is enabled, this view gets its drawable state from its parent rather 9075 * than from its own internal properties.</p> 9076 * 9077 * <p>Note: in the current implementation, setting this property to true after the 9078 * view was added to a ViewGroup might have no effect at all. This property should 9079 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 9080 * 9081 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 9082 * property is enabled, an exception will be thrown.</p> 9083 * 9084 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 9085 * parent, these states should not be affected by this method.</p> 9086 * 9087 * @param enabled True to enable duplication of the parent's drawable state, false 9088 * to disable it. 9089 * 9090 * @see #getDrawableState() 9091 * @see #isDuplicateParentStateEnabled() 9092 */ 9093 public void setDuplicateParentStateEnabled(boolean enabled) { 9094 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 9095 } 9096 9097 /** 9098 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 9099 * 9100 * @return True if this view's drawable state is duplicated from the parent, 9101 * false otherwise 9102 * 9103 * @see #getDrawableState() 9104 * @see #setDuplicateParentStateEnabled(boolean) 9105 */ 9106 public boolean isDuplicateParentStateEnabled() { 9107 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 9108 } 9109 9110 /** 9111 * <p>Specifies the type of layer backing this view. The layer can be 9112 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 9113 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 9114 * 9115 * <p>A layer is associated with an optional {@link android.graphics.Paint} 9116 * instance that controls how the layer is composed on screen. The following 9117 * properties of the paint are taken into account when composing the layer:</p> 9118 * <ul> 9119 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 9120 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 9121 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 9122 * </ul> 9123 * 9124 * <p>If this view has an alpha value set to < 1.0 by calling 9125 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 9126 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 9127 * equivalent to setting a hardware layer on this view and providing a paint with 9128 * the desired alpha value.<p> 9129 * 9130 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 9131 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 9132 * for more information on when and how to use layers.</p> 9133 * 9134 * @param layerType The ype of layer to use with this view, must be one of 9135 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9136 * {@link #LAYER_TYPE_HARDWARE} 9137 * @param paint The paint used to compose the layer. This argument is optional 9138 * and can be null. It is ignored when the layer type is 9139 * {@link #LAYER_TYPE_NONE} 9140 * 9141 * @see #getLayerType() 9142 * @see #LAYER_TYPE_NONE 9143 * @see #LAYER_TYPE_SOFTWARE 9144 * @see #LAYER_TYPE_HARDWARE 9145 * @see #setAlpha(float) 9146 * 9147 * @attr ref android.R.styleable#View_layerType 9148 */ 9149 public void setLayerType(int layerType, Paint paint) { 9150 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 9151 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 9152 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 9153 } 9154 9155 if (layerType == mLayerType) { 9156 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 9157 mLayerPaint = paint == null ? new Paint() : paint; 9158 invalidateParentCaches(); 9159 invalidate(true); 9160 } 9161 return; 9162 } 9163 9164 // Destroy any previous software drawing cache if needed 9165 switch (mLayerType) { 9166 case LAYER_TYPE_HARDWARE: 9167 if (mHardwareLayer != null) { 9168 mHardwareLayer.destroy(); 9169 mHardwareLayer = null; 9170 } 9171 // fall through - unaccelerated views may use software layer mechanism instead 9172 case LAYER_TYPE_SOFTWARE: 9173 if (mDrawingCache != null) { 9174 mDrawingCache.recycle(); 9175 mDrawingCache = null; 9176 } 9177 9178 if (mUnscaledDrawingCache != null) { 9179 mUnscaledDrawingCache.recycle(); 9180 mUnscaledDrawingCache = null; 9181 } 9182 break; 9183 default: 9184 break; 9185 } 9186 9187 mLayerType = layerType; 9188 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 9189 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 9190 mLocalDirtyRect = layerDisabled ? null : new Rect(); 9191 9192 invalidateParentCaches(); 9193 invalidate(true); 9194 } 9195 9196 /** 9197 * Indicates what type of layer is currently associated with this view. By default 9198 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 9199 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 9200 * for more information on the different types of layers. 9201 * 9202 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9203 * {@link #LAYER_TYPE_HARDWARE} 9204 * 9205 * @see #setLayerType(int, android.graphics.Paint) 9206 * @see #buildLayer() 9207 * @see #LAYER_TYPE_NONE 9208 * @see #LAYER_TYPE_SOFTWARE 9209 * @see #LAYER_TYPE_HARDWARE 9210 */ 9211 public int getLayerType() { 9212 return mLayerType; 9213 } 9214 9215 /** 9216 * Forces this view's layer to be created and this view to be rendered 9217 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 9218 * invoking this method will have no effect. 9219 * 9220 * This method can for instance be used to render a view into its layer before 9221 * starting an animation. If this view is complex, rendering into the layer 9222 * before starting the animation will avoid skipping frames. 9223 * 9224 * @throws IllegalStateException If this view is not attached to a window 9225 * 9226 * @see #setLayerType(int, android.graphics.Paint) 9227 */ 9228 public void buildLayer() { 9229 if (mLayerType == LAYER_TYPE_NONE) return; 9230 9231 if (mAttachInfo == null) { 9232 throw new IllegalStateException("This view must be attached to a window first"); 9233 } 9234 9235 switch (mLayerType) { 9236 case LAYER_TYPE_HARDWARE: 9237 getHardwareLayer(); 9238 break; 9239 case LAYER_TYPE_SOFTWARE: 9240 buildDrawingCache(true); 9241 break; 9242 } 9243 } 9244 9245 /** 9246 * <p>Returns a hardware layer that can be used to draw this view again 9247 * without executing its draw method.</p> 9248 * 9249 * @return A HardwareLayer ready to render, or null if an error occurred. 9250 */ 9251 HardwareLayer getHardwareLayer() { 9252 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 9253 return null; 9254 } 9255 9256 final int width = mRight - mLeft; 9257 final int height = mBottom - mTop; 9258 9259 if (width == 0 || height == 0) { 9260 return null; 9261 } 9262 9263 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 9264 if (mHardwareLayer == null) { 9265 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 9266 width, height, isOpaque()); 9267 mLocalDirtyRect.setEmpty(); 9268 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 9269 mHardwareLayer.resize(width, height); 9270 mLocalDirtyRect.setEmpty(); 9271 } 9272 9273 HardwareCanvas currentCanvas = mAttachInfo.mHardwareCanvas; 9274 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 9275 mAttachInfo.mHardwareCanvas = canvas; 9276 try { 9277 canvas.setViewport(width, height); 9278 canvas.onPreDraw(mLocalDirtyRect); 9279 mLocalDirtyRect.setEmpty(); 9280 9281 final int restoreCount = canvas.save(); 9282 9283 computeScroll(); 9284 canvas.translate(-mScrollX, -mScrollY); 9285 9286 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9287 9288 // Fast path for layouts with no backgrounds 9289 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9290 mPrivateFlags &= ~DIRTY_MASK; 9291 dispatchDraw(canvas); 9292 } else { 9293 draw(canvas); 9294 } 9295 9296 canvas.restoreToCount(restoreCount); 9297 } finally { 9298 canvas.onPostDraw(); 9299 mHardwareLayer.end(currentCanvas); 9300 mAttachInfo.mHardwareCanvas = currentCanvas; 9301 } 9302 } 9303 9304 return mHardwareLayer; 9305 } 9306 9307 /** 9308 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 9309 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 9310 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 9311 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 9312 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 9313 * null.</p> 9314 * 9315 * <p>Enabling the drawing cache is similar to 9316 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 9317 * acceleration is turned off. When hardware acceleration is turned on, enabling the 9318 * drawing cache has no effect on rendering because the system uses a different mechanism 9319 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 9320 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 9321 * for information on how to enable software and hardware layers.</p> 9322 * 9323 * <p>This API can be used to manually generate 9324 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 9325 * {@link #getDrawingCache()}.</p> 9326 * 9327 * @param enabled true to enable the drawing cache, false otherwise 9328 * 9329 * @see #isDrawingCacheEnabled() 9330 * @see #getDrawingCache() 9331 * @see #buildDrawingCache() 9332 * @see #setLayerType(int, android.graphics.Paint) 9333 */ 9334 public void setDrawingCacheEnabled(boolean enabled) { 9335 mCachingFailed = false; 9336 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 9337 } 9338 9339 /** 9340 * <p>Indicates whether the drawing cache is enabled for this view.</p> 9341 * 9342 * @return true if the drawing cache is enabled 9343 * 9344 * @see #setDrawingCacheEnabled(boolean) 9345 * @see #getDrawingCache() 9346 */ 9347 @ViewDebug.ExportedProperty(category = "drawing") 9348 public boolean isDrawingCacheEnabled() { 9349 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 9350 } 9351 9352 /** 9353 * Debugging utility which recursively outputs the dirty state of a view and its 9354 * descendants. 9355 * 9356 * @hide 9357 */ 9358 @SuppressWarnings({"UnusedDeclaration"}) 9359 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 9360 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 9361 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 9362 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 9363 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 9364 if (clear) { 9365 mPrivateFlags &= clearMask; 9366 } 9367 if (this instanceof ViewGroup) { 9368 ViewGroup parent = (ViewGroup) this; 9369 final int count = parent.getChildCount(); 9370 for (int i = 0; i < count; i++) { 9371 final View child = parent.getChildAt(i); 9372 child.outputDirtyFlags(indent + " ", clear, clearMask); 9373 } 9374 } 9375 } 9376 9377 /** 9378 * This method is used by ViewGroup to cause its children to restore or recreate their 9379 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 9380 * to recreate its own display list, which would happen if it went through the normal 9381 * draw/dispatchDraw mechanisms. 9382 * 9383 * @hide 9384 */ 9385 protected void dispatchGetDisplayList() {} 9386 9387 /** 9388 * A view that is not attached or hardware accelerated cannot create a display list. 9389 * This method checks these conditions and returns the appropriate result. 9390 * 9391 * @return true if view has the ability to create a display list, false otherwise. 9392 * 9393 * @hide 9394 */ 9395 public boolean canHaveDisplayList() { 9396 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 9397 } 9398 9399 /** 9400 * <p>Returns a display list that can be used to draw this view again 9401 * without executing its draw method.</p> 9402 * 9403 * @return A DisplayList ready to replay, or null if caching is not enabled. 9404 * 9405 * @hide 9406 */ 9407 public DisplayList getDisplayList() { 9408 if (!canHaveDisplayList()) { 9409 return null; 9410 } 9411 9412 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 9413 mDisplayList == null || !mDisplayList.isValid() || 9414 mRecreateDisplayList)) { 9415 // Don't need to recreate the display list, just need to tell our 9416 // children to restore/recreate theirs 9417 if (mDisplayList != null && mDisplayList.isValid() && 9418 !mRecreateDisplayList) { 9419 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9420 mPrivateFlags &= ~DIRTY_MASK; 9421 dispatchGetDisplayList(); 9422 9423 return mDisplayList; 9424 } 9425 9426 // If we got here, we're recreating it. Mark it as such to ensure that 9427 // we copy in child display lists into ours in drawChild() 9428 mRecreateDisplayList = true; 9429 if (mDisplayList == null) { 9430 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(this); 9431 // If we're creating a new display list, make sure our parent gets invalidated 9432 // since they will need to recreate their display list to account for this 9433 // new child display list. 9434 invalidateParentCaches(); 9435 } 9436 9437 final HardwareCanvas canvas = mDisplayList.start(); 9438 try { 9439 int width = mRight - mLeft; 9440 int height = mBottom - mTop; 9441 9442 canvas.setViewport(width, height); 9443 // The dirty rect should always be null for a display list 9444 canvas.onPreDraw(null); 9445 9446 final int restoreCount = canvas.save(); 9447 9448 computeScroll(); 9449 canvas.translate(-mScrollX, -mScrollY); 9450 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9451 9452 // Fast path for layouts with no backgrounds 9453 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9454 mPrivateFlags &= ~DIRTY_MASK; 9455 dispatchDraw(canvas); 9456 } else { 9457 draw(canvas); 9458 } 9459 9460 canvas.restoreToCount(restoreCount); 9461 } finally { 9462 canvas.onPostDraw(); 9463 9464 mDisplayList.end(); 9465 } 9466 } else { 9467 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9468 mPrivateFlags &= ~DIRTY_MASK; 9469 } 9470 9471 return mDisplayList; 9472 } 9473 9474 /** 9475 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 9476 * 9477 * @return A non-scaled bitmap representing this view or null if cache is disabled. 9478 * 9479 * @see #getDrawingCache(boolean) 9480 */ 9481 public Bitmap getDrawingCache() { 9482 return getDrawingCache(false); 9483 } 9484 9485 /** 9486 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 9487 * is null when caching is disabled. If caching is enabled and the cache is not ready, 9488 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 9489 * draw from the cache when the cache is enabled. To benefit from the cache, you must 9490 * request the drawing cache by calling this method and draw it on screen if the 9491 * returned bitmap is not null.</p> 9492 * 9493 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 9494 * this method will create a bitmap of the same size as this view. Because this bitmap 9495 * will be drawn scaled by the parent ViewGroup, the result on screen might show 9496 * scaling artifacts. To avoid such artifacts, you should call this method by setting 9497 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 9498 * size than the view. This implies that your application must be able to handle this 9499 * size.</p> 9500 * 9501 * @param autoScale Indicates whether the generated bitmap should be scaled based on 9502 * the current density of the screen when the application is in compatibility 9503 * mode. 9504 * 9505 * @return A bitmap representing this view or null if cache is disabled. 9506 * 9507 * @see #setDrawingCacheEnabled(boolean) 9508 * @see #isDrawingCacheEnabled() 9509 * @see #buildDrawingCache(boolean) 9510 * @see #destroyDrawingCache() 9511 */ 9512 public Bitmap getDrawingCache(boolean autoScale) { 9513 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 9514 return null; 9515 } 9516 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 9517 buildDrawingCache(autoScale); 9518 } 9519 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 9520 } 9521 9522 /** 9523 * <p>Frees the resources used by the drawing cache. If you call 9524 * {@link #buildDrawingCache()} manually without calling 9525 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 9526 * should cleanup the cache with this method afterwards.</p> 9527 * 9528 * @see #setDrawingCacheEnabled(boolean) 9529 * @see #buildDrawingCache() 9530 * @see #getDrawingCache() 9531 */ 9532 public void destroyDrawingCache() { 9533 if (mDrawingCache != null) { 9534 mDrawingCache.recycle(); 9535 mDrawingCache = null; 9536 } 9537 if (mUnscaledDrawingCache != null) { 9538 mUnscaledDrawingCache.recycle(); 9539 mUnscaledDrawingCache = null; 9540 } 9541 } 9542 9543 /** 9544 * Setting a solid background color for the drawing cache's bitmaps will improve 9545 * perfromance and memory usage. Note, though that this should only be used if this 9546 * view will always be drawn on top of a solid color. 9547 * 9548 * @param color The background color to use for the drawing cache's bitmap 9549 * 9550 * @see #setDrawingCacheEnabled(boolean) 9551 * @see #buildDrawingCache() 9552 * @see #getDrawingCache() 9553 */ 9554 public void setDrawingCacheBackgroundColor(int color) { 9555 if (color != mDrawingCacheBackgroundColor) { 9556 mDrawingCacheBackgroundColor = color; 9557 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9558 } 9559 } 9560 9561 /** 9562 * @see #setDrawingCacheBackgroundColor(int) 9563 * 9564 * @return The background color to used for the drawing cache's bitmap 9565 */ 9566 public int getDrawingCacheBackgroundColor() { 9567 return mDrawingCacheBackgroundColor; 9568 } 9569 9570 /** 9571 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 9572 * 9573 * @see #buildDrawingCache(boolean) 9574 */ 9575 public void buildDrawingCache() { 9576 buildDrawingCache(false); 9577 } 9578 9579 /** 9580 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 9581 * 9582 * <p>If you call {@link #buildDrawingCache()} manually without calling 9583 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 9584 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 9585 * 9586 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 9587 * this method will create a bitmap of the same size as this view. Because this bitmap 9588 * will be drawn scaled by the parent ViewGroup, the result on screen might show 9589 * scaling artifacts. To avoid such artifacts, you should call this method by setting 9590 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 9591 * size than the view. This implies that your application must be able to handle this 9592 * size.</p> 9593 * 9594 * <p>You should avoid calling this method when hardware acceleration is enabled. If 9595 * you do not need the drawing cache bitmap, calling this method will increase memory 9596 * usage and cause the view to be rendered in software once, thus negatively impacting 9597 * performance.</p> 9598 * 9599 * @see #getDrawingCache() 9600 * @see #destroyDrawingCache() 9601 */ 9602 public void buildDrawingCache(boolean autoScale) { 9603 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 9604 mDrawingCache == null : mUnscaledDrawingCache == null)) { 9605 mCachingFailed = false; 9606 9607 if (ViewDebug.TRACE_HIERARCHY) { 9608 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 9609 } 9610 9611 int width = mRight - mLeft; 9612 int height = mBottom - mTop; 9613 9614 final AttachInfo attachInfo = mAttachInfo; 9615 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 9616 9617 if (autoScale && scalingRequired) { 9618 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 9619 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 9620 } 9621 9622 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 9623 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 9624 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 9625 9626 if (width <= 0 || height <= 0 || 9627 // Projected bitmap size in bytes 9628 (width * height * (opaque && !use32BitCache ? 2 : 4) > 9629 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 9630 destroyDrawingCache(); 9631 mCachingFailed = true; 9632 return; 9633 } 9634 9635 boolean clear = true; 9636 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 9637 9638 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 9639 Bitmap.Config quality; 9640 if (!opaque) { 9641 // Never pick ARGB_4444 because it looks awful 9642 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 9643 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 9644 case DRAWING_CACHE_QUALITY_AUTO: 9645 quality = Bitmap.Config.ARGB_8888; 9646 break; 9647 case DRAWING_CACHE_QUALITY_LOW: 9648 quality = Bitmap.Config.ARGB_8888; 9649 break; 9650 case DRAWING_CACHE_QUALITY_HIGH: 9651 quality = Bitmap.Config.ARGB_8888; 9652 break; 9653 default: 9654 quality = Bitmap.Config.ARGB_8888; 9655 break; 9656 } 9657 } else { 9658 // Optimization for translucent windows 9659 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 9660 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 9661 } 9662 9663 // Try to cleanup memory 9664 if (bitmap != null) bitmap.recycle(); 9665 9666 try { 9667 bitmap = Bitmap.createBitmap(width, height, quality); 9668 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 9669 if (autoScale) { 9670 mDrawingCache = bitmap; 9671 } else { 9672 mUnscaledDrawingCache = bitmap; 9673 } 9674 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 9675 } catch (OutOfMemoryError e) { 9676 // If there is not enough memory to create the bitmap cache, just 9677 // ignore the issue as bitmap caches are not required to draw the 9678 // view hierarchy 9679 if (autoScale) { 9680 mDrawingCache = null; 9681 } else { 9682 mUnscaledDrawingCache = null; 9683 } 9684 mCachingFailed = true; 9685 return; 9686 } 9687 9688 clear = drawingCacheBackgroundColor != 0; 9689 } 9690 9691 Canvas canvas; 9692 if (attachInfo != null) { 9693 canvas = attachInfo.mCanvas; 9694 if (canvas == null) { 9695 canvas = new Canvas(); 9696 } 9697 canvas.setBitmap(bitmap); 9698 // Temporarily clobber the cached Canvas in case one of our children 9699 // is also using a drawing cache. Without this, the children would 9700 // steal the canvas by attaching their own bitmap to it and bad, bad 9701 // thing would happen (invisible views, corrupted drawings, etc.) 9702 attachInfo.mCanvas = null; 9703 } else { 9704 // This case should hopefully never or seldom happen 9705 canvas = new Canvas(bitmap); 9706 } 9707 9708 if (clear) { 9709 bitmap.eraseColor(drawingCacheBackgroundColor); 9710 } 9711 9712 computeScroll(); 9713 final int restoreCount = canvas.save(); 9714 9715 if (autoScale && scalingRequired) { 9716 final float scale = attachInfo.mApplicationScale; 9717 canvas.scale(scale, scale); 9718 } 9719 9720 canvas.translate(-mScrollX, -mScrollY); 9721 9722 mPrivateFlags |= DRAWN; 9723 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 9724 mLayerType != LAYER_TYPE_NONE) { 9725 mPrivateFlags |= DRAWING_CACHE_VALID; 9726 } 9727 9728 // Fast path for layouts with no backgrounds 9729 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9730 if (ViewDebug.TRACE_HIERARCHY) { 9731 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 9732 } 9733 mPrivateFlags &= ~DIRTY_MASK; 9734 dispatchDraw(canvas); 9735 } else { 9736 draw(canvas); 9737 } 9738 9739 canvas.restoreToCount(restoreCount); 9740 9741 if (attachInfo != null) { 9742 // Restore the cached Canvas for our siblings 9743 attachInfo.mCanvas = canvas; 9744 } 9745 } 9746 } 9747 9748 /** 9749 * Create a snapshot of the view into a bitmap. We should probably make 9750 * some form of this public, but should think about the API. 9751 */ 9752 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 9753 int width = mRight - mLeft; 9754 int height = mBottom - mTop; 9755 9756 final AttachInfo attachInfo = mAttachInfo; 9757 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 9758 width = (int) ((width * scale) + 0.5f); 9759 height = (int) ((height * scale) + 0.5f); 9760 9761 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 9762 if (bitmap == null) { 9763 throw new OutOfMemoryError(); 9764 } 9765 9766 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 9767 9768 Canvas canvas; 9769 if (attachInfo != null) { 9770 canvas = attachInfo.mCanvas; 9771 if (canvas == null) { 9772 canvas = new Canvas(); 9773 } 9774 canvas.setBitmap(bitmap); 9775 // Temporarily clobber the cached Canvas in case one of our children 9776 // is also using a drawing cache. Without this, the children would 9777 // steal the canvas by attaching their own bitmap to it and bad, bad 9778 // things would happen (invisible views, corrupted drawings, etc.) 9779 attachInfo.mCanvas = null; 9780 } else { 9781 // This case should hopefully never or seldom happen 9782 canvas = new Canvas(bitmap); 9783 } 9784 9785 if ((backgroundColor & 0xff000000) != 0) { 9786 bitmap.eraseColor(backgroundColor); 9787 } 9788 9789 computeScroll(); 9790 final int restoreCount = canvas.save(); 9791 canvas.scale(scale, scale); 9792 canvas.translate(-mScrollX, -mScrollY); 9793 9794 // Temporarily remove the dirty mask 9795 int flags = mPrivateFlags; 9796 mPrivateFlags &= ~DIRTY_MASK; 9797 9798 // Fast path for layouts with no backgrounds 9799 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9800 dispatchDraw(canvas); 9801 } else { 9802 draw(canvas); 9803 } 9804 9805 mPrivateFlags = flags; 9806 9807 canvas.restoreToCount(restoreCount); 9808 9809 if (attachInfo != null) { 9810 // Restore the cached Canvas for our siblings 9811 attachInfo.mCanvas = canvas; 9812 } 9813 9814 return bitmap; 9815 } 9816 9817 /** 9818 * Indicates whether this View is currently in edit mode. A View is usually 9819 * in edit mode when displayed within a developer tool. For instance, if 9820 * this View is being drawn by a visual user interface builder, this method 9821 * should return true. 9822 * 9823 * Subclasses should check the return value of this method to provide 9824 * different behaviors if their normal behavior might interfere with the 9825 * host environment. For instance: the class spawns a thread in its 9826 * constructor, the drawing code relies on device-specific features, etc. 9827 * 9828 * This method is usually checked in the drawing code of custom widgets. 9829 * 9830 * @return True if this View is in edit mode, false otherwise. 9831 */ 9832 public boolean isInEditMode() { 9833 return false; 9834 } 9835 9836 /** 9837 * If the View draws content inside its padding and enables fading edges, 9838 * it needs to support padding offsets. Padding offsets are added to the 9839 * fading edges to extend the length of the fade so that it covers pixels 9840 * drawn inside the padding. 9841 * 9842 * Subclasses of this class should override this method if they need 9843 * to draw content inside the padding. 9844 * 9845 * @return True if padding offset must be applied, false otherwise. 9846 * 9847 * @see #getLeftPaddingOffset() 9848 * @see #getRightPaddingOffset() 9849 * @see #getTopPaddingOffset() 9850 * @see #getBottomPaddingOffset() 9851 * 9852 * @since CURRENT 9853 */ 9854 protected boolean isPaddingOffsetRequired() { 9855 return false; 9856 } 9857 9858 /** 9859 * Amount by which to extend the left fading region. Called only when 9860 * {@link #isPaddingOffsetRequired()} returns true. 9861 * 9862 * @return The left padding offset in pixels. 9863 * 9864 * @see #isPaddingOffsetRequired() 9865 * 9866 * @since CURRENT 9867 */ 9868 protected int getLeftPaddingOffset() { 9869 return 0; 9870 } 9871 9872 /** 9873 * Amount by which to extend the right fading region. Called only when 9874 * {@link #isPaddingOffsetRequired()} returns true. 9875 * 9876 * @return The right padding offset in pixels. 9877 * 9878 * @see #isPaddingOffsetRequired() 9879 * 9880 * @since CURRENT 9881 */ 9882 protected int getRightPaddingOffset() { 9883 return 0; 9884 } 9885 9886 /** 9887 * Amount by which to extend the top fading region. Called only when 9888 * {@link #isPaddingOffsetRequired()} returns true. 9889 * 9890 * @return The top padding offset in pixels. 9891 * 9892 * @see #isPaddingOffsetRequired() 9893 * 9894 * @since CURRENT 9895 */ 9896 protected int getTopPaddingOffset() { 9897 return 0; 9898 } 9899 9900 /** 9901 * Amount by which to extend the bottom fading region. Called only when 9902 * {@link #isPaddingOffsetRequired()} returns true. 9903 * 9904 * @return The bottom padding offset in pixels. 9905 * 9906 * @see #isPaddingOffsetRequired() 9907 * 9908 * @since CURRENT 9909 */ 9910 protected int getBottomPaddingOffset() { 9911 return 0; 9912 } 9913 9914 /** 9915 * <p>Indicates whether this view is attached to an hardware accelerated 9916 * window or not.</p> 9917 * 9918 * <p>Even if this method returns true, it does not mean that every call 9919 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 9920 * accelerated {@link android.graphics.Canvas}. For instance, if this view 9921 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 9922 * window is hardware accelerated, 9923 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 9924 * return false, and this method will return true.</p> 9925 * 9926 * @return True if the view is attached to a window and the window is 9927 * hardware accelerated; false in any other case. 9928 */ 9929 public boolean isHardwareAccelerated() { 9930 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 9931 } 9932 9933 /** 9934 * Manually render this view (and all of its children) to the given Canvas. 9935 * The view must have already done a full layout before this function is 9936 * called. When implementing a view, implement 9937 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 9938 * If you do need to override this method, call the superclass version. 9939 * 9940 * @param canvas The Canvas to which the View is rendered. 9941 */ 9942 public void draw(Canvas canvas) { 9943 if (ViewDebug.TRACE_HIERARCHY) { 9944 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 9945 } 9946 9947 final int privateFlags = mPrivateFlags; 9948 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 9949 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 9950 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 9951 9952 /* 9953 * Draw traversal performs several drawing steps which must be executed 9954 * in the appropriate order: 9955 * 9956 * 1. Draw the background 9957 * 2. If necessary, save the canvas' layers to prepare for fading 9958 * 3. Draw view's content 9959 * 4. Draw children 9960 * 5. If necessary, draw the fading edges and restore layers 9961 * 6. Draw decorations (scrollbars for instance) 9962 */ 9963 9964 // Step 1, draw the background, if needed 9965 int saveCount; 9966 9967 if (!dirtyOpaque) { 9968 final Drawable background = mBGDrawable; 9969 if (background != null) { 9970 final int scrollX = mScrollX; 9971 final int scrollY = mScrollY; 9972 9973 if (mBackgroundSizeChanged) { 9974 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 9975 mBackgroundSizeChanged = false; 9976 } 9977 9978 if ((scrollX | scrollY) == 0) { 9979 background.draw(canvas); 9980 } else { 9981 canvas.translate(scrollX, scrollY); 9982 background.draw(canvas); 9983 canvas.translate(-scrollX, -scrollY); 9984 } 9985 } 9986 } 9987 9988 // skip step 2 & 5 if possible (common case) 9989 final int viewFlags = mViewFlags; 9990 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 9991 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 9992 if (!verticalEdges && !horizontalEdges) { 9993 // Step 3, draw the content 9994 if (!dirtyOpaque) onDraw(canvas); 9995 9996 // Step 4, draw the children 9997 dispatchDraw(canvas); 9998 9999 // Step 6, draw decorations (scrollbars) 10000 onDrawScrollBars(canvas); 10001 10002 // we're done... 10003 return; 10004 } 10005 10006 /* 10007 * Here we do the full fledged routine... 10008 * (this is an uncommon case where speed matters less, 10009 * this is why we repeat some of the tests that have been 10010 * done above) 10011 */ 10012 10013 boolean drawTop = false; 10014 boolean drawBottom = false; 10015 boolean drawLeft = false; 10016 boolean drawRight = false; 10017 10018 float topFadeStrength = 0.0f; 10019 float bottomFadeStrength = 0.0f; 10020 float leftFadeStrength = 0.0f; 10021 float rightFadeStrength = 0.0f; 10022 10023 // Step 2, save the canvas' layers 10024 int paddingLeft = mPaddingLeft; 10025 int paddingTop = mPaddingTop; 10026 10027 final boolean offsetRequired = isPaddingOffsetRequired(); 10028 if (offsetRequired) { 10029 paddingLeft += getLeftPaddingOffset(); 10030 paddingTop += getTopPaddingOffset(); 10031 } 10032 10033 int left = mScrollX + paddingLeft; 10034 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 10035 int top = mScrollY + paddingTop; 10036 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 10037 10038 if (offsetRequired) { 10039 right += getRightPaddingOffset(); 10040 bottom += getBottomPaddingOffset(); 10041 } 10042 10043 final ScrollabilityCache scrollabilityCache = mScrollCache; 10044 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 10045 int length = (int) fadeHeight; 10046 10047 // clip the fade length if top and bottom fades overlap 10048 // overlapping fades produce odd-looking artifacts 10049 if (verticalEdges && (top + length > bottom - length)) { 10050 length = (bottom - top) / 2; 10051 } 10052 10053 // also clip horizontal fades if necessary 10054 if (horizontalEdges && (left + length > right - length)) { 10055 length = (right - left) / 2; 10056 } 10057 10058 if (verticalEdges) { 10059 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 10060 drawTop = topFadeStrength * fadeHeight > 1.0f; 10061 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 10062 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 10063 } 10064 10065 if (horizontalEdges) { 10066 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 10067 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 10068 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 10069 drawRight = rightFadeStrength * fadeHeight > 1.0f; 10070 } 10071 10072 saveCount = canvas.getSaveCount(); 10073 10074 int solidColor = getSolidColor(); 10075 if (solidColor == 0) { 10076 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 10077 10078 if (drawTop) { 10079 canvas.saveLayer(left, top, right, top + length, null, flags); 10080 } 10081 10082 if (drawBottom) { 10083 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 10084 } 10085 10086 if (drawLeft) { 10087 canvas.saveLayer(left, top, left + length, bottom, null, flags); 10088 } 10089 10090 if (drawRight) { 10091 canvas.saveLayer(right - length, top, right, bottom, null, flags); 10092 } 10093 } else { 10094 scrollabilityCache.setFadeColor(solidColor); 10095 } 10096 10097 // Step 3, draw the content 10098 if (!dirtyOpaque) onDraw(canvas); 10099 10100 // Step 4, draw the children 10101 dispatchDraw(canvas); 10102 10103 // Step 5, draw the fade effect and restore layers 10104 final Paint p = scrollabilityCache.paint; 10105 final Matrix matrix = scrollabilityCache.matrix; 10106 final Shader fade = scrollabilityCache.shader; 10107 10108 if (drawTop) { 10109 matrix.setScale(1, fadeHeight * topFadeStrength); 10110 matrix.postTranslate(left, top); 10111 fade.setLocalMatrix(matrix); 10112 canvas.drawRect(left, top, right, top + length, p); 10113 } 10114 10115 if (drawBottom) { 10116 matrix.setScale(1, fadeHeight * bottomFadeStrength); 10117 matrix.postRotate(180); 10118 matrix.postTranslate(left, bottom); 10119 fade.setLocalMatrix(matrix); 10120 canvas.drawRect(left, bottom - length, right, bottom, p); 10121 } 10122 10123 if (drawLeft) { 10124 matrix.setScale(1, fadeHeight * leftFadeStrength); 10125 matrix.postRotate(-90); 10126 matrix.postTranslate(left, top); 10127 fade.setLocalMatrix(matrix); 10128 canvas.drawRect(left, top, left + length, bottom, p); 10129 } 10130 10131 if (drawRight) { 10132 matrix.setScale(1, fadeHeight * rightFadeStrength); 10133 matrix.postRotate(90); 10134 matrix.postTranslate(right, top); 10135 fade.setLocalMatrix(matrix); 10136 canvas.drawRect(right - length, top, right, bottom, p); 10137 } 10138 10139 canvas.restoreToCount(saveCount); 10140 10141 // Step 6, draw decorations (scrollbars) 10142 onDrawScrollBars(canvas); 10143 } 10144 10145 /** 10146 * Override this if your view is known to always be drawn on top of a solid color background, 10147 * and needs to draw fading edges. Returning a non-zero color enables the view system to 10148 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 10149 * should be set to 0xFF. 10150 * 10151 * @see #setVerticalFadingEdgeEnabled(boolean) 10152 * @see #setHorizontalFadingEdgeEnabled(boolean) 10153 * 10154 * @return The known solid color background for this view, or 0 if the color may vary 10155 */ 10156 @ViewDebug.ExportedProperty(category = "drawing") 10157 public int getSolidColor() { 10158 return 0; 10159 } 10160 10161 /** 10162 * Build a human readable string representation of the specified view flags. 10163 * 10164 * @param flags the view flags to convert to a string 10165 * @return a String representing the supplied flags 10166 */ 10167 private static String printFlags(int flags) { 10168 String output = ""; 10169 int numFlags = 0; 10170 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 10171 output += "TAKES_FOCUS"; 10172 numFlags++; 10173 } 10174 10175 switch (flags & VISIBILITY_MASK) { 10176 case INVISIBLE: 10177 if (numFlags > 0) { 10178 output += " "; 10179 } 10180 output += "INVISIBLE"; 10181 // USELESS HERE numFlags++; 10182 break; 10183 case GONE: 10184 if (numFlags > 0) { 10185 output += " "; 10186 } 10187 output += "GONE"; 10188 // USELESS HERE numFlags++; 10189 break; 10190 default: 10191 break; 10192 } 10193 return output; 10194 } 10195 10196 /** 10197 * Build a human readable string representation of the specified private 10198 * view flags. 10199 * 10200 * @param privateFlags the private view flags to convert to a string 10201 * @return a String representing the supplied flags 10202 */ 10203 private static String printPrivateFlags(int privateFlags) { 10204 String output = ""; 10205 int numFlags = 0; 10206 10207 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 10208 output += "WANTS_FOCUS"; 10209 numFlags++; 10210 } 10211 10212 if ((privateFlags & FOCUSED) == FOCUSED) { 10213 if (numFlags > 0) { 10214 output += " "; 10215 } 10216 output += "FOCUSED"; 10217 numFlags++; 10218 } 10219 10220 if ((privateFlags & SELECTED) == SELECTED) { 10221 if (numFlags > 0) { 10222 output += " "; 10223 } 10224 output += "SELECTED"; 10225 numFlags++; 10226 } 10227 10228 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 10229 if (numFlags > 0) { 10230 output += " "; 10231 } 10232 output += "IS_ROOT_NAMESPACE"; 10233 numFlags++; 10234 } 10235 10236 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 10237 if (numFlags > 0) { 10238 output += " "; 10239 } 10240 output += "HAS_BOUNDS"; 10241 numFlags++; 10242 } 10243 10244 if ((privateFlags & DRAWN) == DRAWN) { 10245 if (numFlags > 0) { 10246 output += " "; 10247 } 10248 output += "DRAWN"; 10249 // USELESS HERE numFlags++; 10250 } 10251 return output; 10252 } 10253 10254 /** 10255 * <p>Indicates whether or not this view's layout will be requested during 10256 * the next hierarchy layout pass.</p> 10257 * 10258 * @return true if the layout will be forced during next layout pass 10259 */ 10260 public boolean isLayoutRequested() { 10261 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 10262 } 10263 10264 /** 10265 * Assign a size and position to a view and all of its 10266 * descendants 10267 * 10268 * <p>This is the second phase of the layout mechanism. 10269 * (The first is measuring). In this phase, each parent calls 10270 * layout on all of its children to position them. 10271 * This is typically done using the child measurements 10272 * that were stored in the measure pass().</p> 10273 * 10274 * <p>Derived classes should not override this method. 10275 * Derived classes with children should override 10276 * onLayout. In that method, they should 10277 * call layout on each of their children.</p> 10278 * 10279 * @param l Left position, relative to parent 10280 * @param t Top position, relative to parent 10281 * @param r Right position, relative to parent 10282 * @param b Bottom position, relative to parent 10283 */ 10284 @SuppressWarnings({"unchecked"}) 10285 public void layout(int l, int t, int r, int b) { 10286 int oldL = mLeft; 10287 int oldT = mTop; 10288 int oldB = mBottom; 10289 int oldR = mRight; 10290 boolean changed = setFrame(l, t, r, b); 10291 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 10292 if (ViewDebug.TRACE_HIERARCHY) { 10293 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 10294 } 10295 10296 onLayout(changed, l, t, r, b); 10297 mPrivateFlags &= ~LAYOUT_REQUIRED; 10298 10299 if (mOnLayoutChangeListeners != null) { 10300 ArrayList<OnLayoutChangeListener> listenersCopy = 10301 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 10302 int numListeners = listenersCopy.size(); 10303 for (int i = 0; i < numListeners; ++i) { 10304 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 10305 } 10306 } 10307 } 10308 mPrivateFlags &= ~FORCE_LAYOUT; 10309 } 10310 10311 /** 10312 * Called from layout when this view should 10313 * assign a size and position to each of its children. 10314 * 10315 * Derived classes with children should override 10316 * this method and call layout on each of 10317 * their children. 10318 * @param changed This is a new size or position for this view 10319 * @param left Left position, relative to parent 10320 * @param top Top position, relative to parent 10321 * @param right Right position, relative to parent 10322 * @param bottom Bottom position, relative to parent 10323 */ 10324 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 10325 } 10326 10327 /** 10328 * Assign a size and position to this view. 10329 * 10330 * This is called from layout. 10331 * 10332 * @param left Left position, relative to parent 10333 * @param top Top position, relative to parent 10334 * @param right Right position, relative to parent 10335 * @param bottom Bottom position, relative to parent 10336 * @return true if the new size and position are different than the 10337 * previous ones 10338 * {@hide} 10339 */ 10340 protected boolean setFrame(int left, int top, int right, int bottom) { 10341 boolean changed = false; 10342 10343 if (DBG) { 10344 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 10345 + right + "," + bottom + ")"); 10346 } 10347 10348 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 10349 changed = true; 10350 10351 // Remember our drawn bit 10352 int drawn = mPrivateFlags & DRAWN; 10353 10354 // Invalidate our old position 10355 invalidate(true); 10356 10357 10358 int oldWidth = mRight - mLeft; 10359 int oldHeight = mBottom - mTop; 10360 10361 mLeft = left; 10362 mTop = top; 10363 mRight = right; 10364 mBottom = bottom; 10365 10366 mPrivateFlags |= HAS_BOUNDS; 10367 10368 int newWidth = right - left; 10369 int newHeight = bottom - top; 10370 10371 if (newWidth != oldWidth || newHeight != oldHeight) { 10372 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 10373 // A change in dimension means an auto-centered pivot point changes, too 10374 mMatrixDirty = true; 10375 } 10376 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 10377 } 10378 10379 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 10380 // If we are visible, force the DRAWN bit to on so that 10381 // this invalidate will go through (at least to our parent). 10382 // This is because someone may have invalidated this view 10383 // before this call to setFrame came in, thereby clearing 10384 // the DRAWN bit. 10385 mPrivateFlags |= DRAWN; 10386 invalidate(true); 10387 // parent display list may need to be recreated based on a change in the bounds 10388 // of any child 10389 invalidateParentCaches(); 10390 } 10391 10392 // Reset drawn bit to original value (invalidate turns it off) 10393 mPrivateFlags |= drawn; 10394 10395 mBackgroundSizeChanged = true; 10396 } 10397 return changed; 10398 } 10399 10400 /** 10401 * Finalize inflating a view from XML. This is called as the last phase 10402 * of inflation, after all child views have been added. 10403 * 10404 * <p>Even if the subclass overrides onFinishInflate, they should always be 10405 * sure to call the super method, so that we get called. 10406 */ 10407 protected void onFinishInflate() { 10408 } 10409 10410 /** 10411 * Returns the resources associated with this view. 10412 * 10413 * @return Resources object. 10414 */ 10415 public Resources getResources() { 10416 return mResources; 10417 } 10418 10419 /** 10420 * Invalidates the specified Drawable. 10421 * 10422 * @param drawable the drawable to invalidate 10423 */ 10424 public void invalidateDrawable(Drawable drawable) { 10425 if (verifyDrawable(drawable)) { 10426 final Rect dirty = drawable.getBounds(); 10427 final int scrollX = mScrollX; 10428 final int scrollY = mScrollY; 10429 10430 invalidate(dirty.left + scrollX, dirty.top + scrollY, 10431 dirty.right + scrollX, dirty.bottom + scrollY); 10432 } 10433 } 10434 10435 /** 10436 * Schedules an action on a drawable to occur at a specified time. 10437 * 10438 * @param who the recipient of the action 10439 * @param what the action to run on the drawable 10440 * @param when the time at which the action must occur. Uses the 10441 * {@link SystemClock#uptimeMillis} timebase. 10442 */ 10443 public void scheduleDrawable(Drawable who, Runnable what, long when) { 10444 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 10445 mAttachInfo.mHandler.postAtTime(what, who, when); 10446 } 10447 } 10448 10449 /** 10450 * Cancels a scheduled action on a drawable. 10451 * 10452 * @param who the recipient of the action 10453 * @param what the action to cancel 10454 */ 10455 public void unscheduleDrawable(Drawable who, Runnable what) { 10456 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 10457 mAttachInfo.mHandler.removeCallbacks(what, who); 10458 } 10459 } 10460 10461 /** 10462 * Unschedule any events associated with the given Drawable. This can be 10463 * used when selecting a new Drawable into a view, so that the previous 10464 * one is completely unscheduled. 10465 * 10466 * @param who The Drawable to unschedule. 10467 * 10468 * @see #drawableStateChanged 10469 */ 10470 public void unscheduleDrawable(Drawable who) { 10471 if (mAttachInfo != null) { 10472 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 10473 } 10474 } 10475 10476 /** 10477 * Return the layout direction of a given Drawable. 10478 * 10479 * @param who the Drawable to query 10480 * 10481 * @hide 10482 */ 10483 public int getResolvedLayoutDirection(Drawable who) { 10484 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 10485 } 10486 10487 /** 10488 * If your view subclass is displaying its own Drawable objects, it should 10489 * override this function and return true for any Drawable it is 10490 * displaying. This allows animations for those drawables to be 10491 * scheduled. 10492 * 10493 * <p>Be sure to call through to the super class when overriding this 10494 * function. 10495 * 10496 * @param who The Drawable to verify. Return true if it is one you are 10497 * displaying, else return the result of calling through to the 10498 * super class. 10499 * 10500 * @return boolean If true than the Drawable is being displayed in the 10501 * view; else false and it is not allowed to animate. 10502 * 10503 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 10504 * @see #drawableStateChanged() 10505 */ 10506 protected boolean verifyDrawable(Drawable who) { 10507 return who == mBGDrawable; 10508 } 10509 10510 /** 10511 * This function is called whenever the state of the view changes in such 10512 * a way that it impacts the state of drawables being shown. 10513 * 10514 * <p>Be sure to call through to the superclass when overriding this 10515 * function. 10516 * 10517 * @see Drawable#setState(int[]) 10518 */ 10519 protected void drawableStateChanged() { 10520 Drawable d = mBGDrawable; 10521 if (d != null && d.isStateful()) { 10522 d.setState(getDrawableState()); 10523 } 10524 } 10525 10526 /** 10527 * Call this to force a view to update its drawable state. This will cause 10528 * drawableStateChanged to be called on this view. Views that are interested 10529 * in the new state should call getDrawableState. 10530 * 10531 * @see #drawableStateChanged 10532 * @see #getDrawableState 10533 */ 10534 public void refreshDrawableState() { 10535 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 10536 drawableStateChanged(); 10537 10538 ViewParent parent = mParent; 10539 if (parent != null) { 10540 parent.childDrawableStateChanged(this); 10541 } 10542 } 10543 10544 /** 10545 * Return an array of resource IDs of the drawable states representing the 10546 * current state of the view. 10547 * 10548 * @return The current drawable state 10549 * 10550 * @see Drawable#setState(int[]) 10551 * @see #drawableStateChanged() 10552 * @see #onCreateDrawableState(int) 10553 */ 10554 public final int[] getDrawableState() { 10555 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 10556 return mDrawableState; 10557 } else { 10558 mDrawableState = onCreateDrawableState(0); 10559 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 10560 return mDrawableState; 10561 } 10562 } 10563 10564 /** 10565 * Generate the new {@link android.graphics.drawable.Drawable} state for 10566 * this view. This is called by the view 10567 * system when the cached Drawable state is determined to be invalid. To 10568 * retrieve the current state, you should use {@link #getDrawableState}. 10569 * 10570 * @param extraSpace if non-zero, this is the number of extra entries you 10571 * would like in the returned array in which you can place your own 10572 * states. 10573 * 10574 * @return Returns an array holding the current {@link Drawable} state of 10575 * the view. 10576 * 10577 * @see #mergeDrawableStates(int[], int[]) 10578 */ 10579 protected int[] onCreateDrawableState(int extraSpace) { 10580 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 10581 mParent instanceof View) { 10582 return ((View) mParent).onCreateDrawableState(extraSpace); 10583 } 10584 10585 int[] drawableState; 10586 10587 int privateFlags = mPrivateFlags; 10588 10589 int viewStateIndex = 0; 10590 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 10591 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 10592 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 10593 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 10594 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 10595 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 10596 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 10597 HardwareRenderer.isAvailable()) { 10598 // This is set if HW acceleration is requested, even if the current 10599 // process doesn't allow it. This is just to allow app preview 10600 // windows to better match their app. 10601 viewStateIndex |= VIEW_STATE_ACCELERATED; 10602 } 10603 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 10604 10605 final int privateFlags2 = mPrivateFlags2; 10606 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 10607 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 10608 10609 drawableState = VIEW_STATE_SETS[viewStateIndex]; 10610 10611 //noinspection ConstantIfStatement 10612 if (false) { 10613 Log.i("View", "drawableStateIndex=" + viewStateIndex); 10614 Log.i("View", toString() 10615 + " pressed=" + ((privateFlags & PRESSED) != 0) 10616 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 10617 + " fo=" + hasFocus() 10618 + " sl=" + ((privateFlags & SELECTED) != 0) 10619 + " wf=" + hasWindowFocus() 10620 + ": " + Arrays.toString(drawableState)); 10621 } 10622 10623 if (extraSpace == 0) { 10624 return drawableState; 10625 } 10626 10627 final int[] fullState; 10628 if (drawableState != null) { 10629 fullState = new int[drawableState.length + extraSpace]; 10630 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 10631 } else { 10632 fullState = new int[extraSpace]; 10633 } 10634 10635 return fullState; 10636 } 10637 10638 /** 10639 * Merge your own state values in <var>additionalState</var> into the base 10640 * state values <var>baseState</var> that were returned by 10641 * {@link #onCreateDrawableState(int)}. 10642 * 10643 * @param baseState The base state values returned by 10644 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 10645 * own additional state values. 10646 * 10647 * @param additionalState The additional state values you would like 10648 * added to <var>baseState</var>; this array is not modified. 10649 * 10650 * @return As a convenience, the <var>baseState</var> array you originally 10651 * passed into the function is returned. 10652 * 10653 * @see #onCreateDrawableState(int) 10654 */ 10655 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 10656 final int N = baseState.length; 10657 int i = N - 1; 10658 while (i >= 0 && baseState[i] == 0) { 10659 i--; 10660 } 10661 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 10662 return baseState; 10663 } 10664 10665 /** 10666 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 10667 * on all Drawable objects associated with this view. 10668 */ 10669 public void jumpDrawablesToCurrentState() { 10670 if (mBGDrawable != null) { 10671 mBGDrawable.jumpToCurrentState(); 10672 } 10673 } 10674 10675 /** 10676 * Sets the background color for this view. 10677 * @param color the color of the background 10678 */ 10679 @RemotableViewMethod 10680 public void setBackgroundColor(int color) { 10681 if (mBGDrawable instanceof ColorDrawable) { 10682 ((ColorDrawable) mBGDrawable).setColor(color); 10683 } else { 10684 setBackgroundDrawable(new ColorDrawable(color)); 10685 } 10686 } 10687 10688 /** 10689 * Set the background to a given resource. The resource should refer to 10690 * a Drawable object or 0 to remove the background. 10691 * @param resid The identifier of the resource. 10692 * @attr ref android.R.styleable#View_background 10693 */ 10694 @RemotableViewMethod 10695 public void setBackgroundResource(int resid) { 10696 if (resid != 0 && resid == mBackgroundResource) { 10697 return; 10698 } 10699 10700 Drawable d= null; 10701 if (resid != 0) { 10702 d = mResources.getDrawable(resid); 10703 } 10704 setBackgroundDrawable(d); 10705 10706 mBackgroundResource = resid; 10707 } 10708 10709 /** 10710 * Set the background to a given Drawable, or remove the background. If the 10711 * background has padding, this View's padding is set to the background's 10712 * padding. However, when a background is removed, this View's padding isn't 10713 * touched. If setting the padding is desired, please use 10714 * {@link #setPadding(int, int, int, int)}. 10715 * 10716 * @param d The Drawable to use as the background, or null to remove the 10717 * background 10718 */ 10719 public void setBackgroundDrawable(Drawable d) { 10720 boolean requestLayout = false; 10721 10722 mBackgroundResource = 0; 10723 10724 /* 10725 * Regardless of whether we're setting a new background or not, we want 10726 * to clear the previous drawable. 10727 */ 10728 if (mBGDrawable != null) { 10729 mBGDrawable.setCallback(null); 10730 unscheduleDrawable(mBGDrawable); 10731 } 10732 10733 if (d != null) { 10734 Rect padding = sThreadLocal.get(); 10735 if (padding == null) { 10736 padding = new Rect(); 10737 sThreadLocal.set(padding); 10738 } 10739 if (d.getPadding(padding)) { 10740 setPadding(padding.left, padding.top, padding.right, padding.bottom); 10741 } 10742 10743 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 10744 // if it has a different minimum size, we should layout again 10745 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 10746 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 10747 requestLayout = true; 10748 } 10749 10750 d.setCallback(this); 10751 if (d.isStateful()) { 10752 d.setState(getDrawableState()); 10753 } 10754 d.setVisible(getVisibility() == VISIBLE, false); 10755 mBGDrawable = d; 10756 10757 if ((mPrivateFlags & SKIP_DRAW) != 0) { 10758 mPrivateFlags &= ~SKIP_DRAW; 10759 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 10760 requestLayout = true; 10761 } 10762 } else { 10763 /* Remove the background */ 10764 mBGDrawable = null; 10765 10766 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 10767 /* 10768 * This view ONLY drew the background before and we're removing 10769 * the background, so now it won't draw anything 10770 * (hence we SKIP_DRAW) 10771 */ 10772 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 10773 mPrivateFlags |= SKIP_DRAW; 10774 } 10775 10776 /* 10777 * When the background is set, we try to apply its padding to this 10778 * View. When the background is removed, we don't touch this View's 10779 * padding. This is noted in the Javadocs. Hence, we don't need to 10780 * requestLayout(), the invalidate() below is sufficient. 10781 */ 10782 10783 // The old background's minimum size could have affected this 10784 // View's layout, so let's requestLayout 10785 requestLayout = true; 10786 } 10787 10788 computeOpaqueFlags(); 10789 10790 if (requestLayout) { 10791 requestLayout(); 10792 } 10793 10794 mBackgroundSizeChanged = true; 10795 invalidate(true); 10796 } 10797 10798 /** 10799 * Gets the background drawable 10800 * @return The drawable used as the background for this view, if any. 10801 */ 10802 public Drawable getBackground() { 10803 return mBGDrawable; 10804 } 10805 10806 /** 10807 * Sets the padding. The view may add on the space required to display 10808 * the scrollbars, depending on the style and visibility of the scrollbars. 10809 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 10810 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 10811 * from the values set in this call. 10812 * 10813 * @attr ref android.R.styleable#View_padding 10814 * @attr ref android.R.styleable#View_paddingBottom 10815 * @attr ref android.R.styleable#View_paddingLeft 10816 * @attr ref android.R.styleable#View_paddingRight 10817 * @attr ref android.R.styleable#View_paddingTop 10818 * @param left the left padding in pixels 10819 * @param top the top padding in pixels 10820 * @param right the right padding in pixels 10821 * @param bottom the bottom padding in pixels 10822 */ 10823 public void setPadding(int left, int top, int right, int bottom) { 10824 boolean changed = false; 10825 10826 mUserPaddingLeft = left; 10827 mUserPaddingRight = right; 10828 mUserPaddingBottom = bottom; 10829 10830 final int viewFlags = mViewFlags; 10831 10832 // Common case is there are no scroll bars. 10833 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 10834 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 10835 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 10836 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 10837 ? 0 : getVerticalScrollbarWidth(); 10838 switch (mVerticalScrollbarPosition) { 10839 case SCROLLBAR_POSITION_DEFAULT: 10840 case SCROLLBAR_POSITION_RIGHT: 10841 right += offset; 10842 break; 10843 case SCROLLBAR_POSITION_LEFT: 10844 left += offset; 10845 break; 10846 } 10847 } 10848 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 10849 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 10850 ? 0 : getHorizontalScrollbarHeight(); 10851 } 10852 } 10853 10854 if (mPaddingLeft != left) { 10855 changed = true; 10856 mPaddingLeft = left; 10857 } 10858 if (mPaddingTop != top) { 10859 changed = true; 10860 mPaddingTop = top; 10861 } 10862 if (mPaddingRight != right) { 10863 changed = true; 10864 mPaddingRight = right; 10865 } 10866 if (mPaddingBottom != bottom) { 10867 changed = true; 10868 mPaddingBottom = bottom; 10869 } 10870 10871 if (changed) { 10872 requestLayout(); 10873 } 10874 } 10875 10876 /** 10877 * Returns the top padding of this view. 10878 * 10879 * @return the top padding in pixels 10880 */ 10881 public int getPaddingTop() { 10882 return mPaddingTop; 10883 } 10884 10885 /** 10886 * Returns the bottom padding of this view. If there are inset and enabled 10887 * scrollbars, this value may include the space required to display the 10888 * scrollbars as well. 10889 * 10890 * @return the bottom padding in pixels 10891 */ 10892 public int getPaddingBottom() { 10893 return mPaddingBottom; 10894 } 10895 10896 /** 10897 * Returns the left padding of this view. If there are inset and enabled 10898 * scrollbars, this value may include the space required to display the 10899 * scrollbars as well. 10900 * 10901 * @return the left padding in pixels 10902 */ 10903 public int getPaddingLeft() { 10904 return mPaddingLeft; 10905 } 10906 10907 /** 10908 * Returns the right padding of this view. If there are inset and enabled 10909 * scrollbars, this value may include the space required to display the 10910 * scrollbars as well. 10911 * 10912 * @return the right padding in pixels 10913 */ 10914 public int getPaddingRight() { 10915 return mPaddingRight; 10916 } 10917 10918 /** 10919 * Changes the selection state of this view. A view can be selected or not. 10920 * Note that selection is not the same as focus. Views are typically 10921 * selected in the context of an AdapterView like ListView or GridView; 10922 * the selected view is the view that is highlighted. 10923 * 10924 * @param selected true if the view must be selected, false otherwise 10925 */ 10926 public void setSelected(boolean selected) { 10927 if (((mPrivateFlags & SELECTED) != 0) != selected) { 10928 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 10929 if (!selected) resetPressedState(); 10930 invalidate(true); 10931 refreshDrawableState(); 10932 dispatchSetSelected(selected); 10933 } 10934 } 10935 10936 /** 10937 * Dispatch setSelected to all of this View's children. 10938 * 10939 * @see #setSelected(boolean) 10940 * 10941 * @param selected The new selected state 10942 */ 10943 protected void dispatchSetSelected(boolean selected) { 10944 } 10945 10946 /** 10947 * Indicates the selection state of this view. 10948 * 10949 * @return true if the view is selected, false otherwise 10950 */ 10951 @ViewDebug.ExportedProperty 10952 public boolean isSelected() { 10953 return (mPrivateFlags & SELECTED) != 0; 10954 } 10955 10956 /** 10957 * Changes the activated state of this view. A view can be activated or not. 10958 * Note that activation is not the same as selection. Selection is 10959 * a transient property, representing the view (hierarchy) the user is 10960 * currently interacting with. Activation is a longer-term state that the 10961 * user can move views in and out of. For example, in a list view with 10962 * single or multiple selection enabled, the views in the current selection 10963 * set are activated. (Um, yeah, we are deeply sorry about the terminology 10964 * here.) The activated state is propagated down to children of the view it 10965 * is set on. 10966 * 10967 * @param activated true if the view must be activated, false otherwise 10968 */ 10969 public void setActivated(boolean activated) { 10970 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 10971 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 10972 invalidate(true); 10973 refreshDrawableState(); 10974 dispatchSetActivated(activated); 10975 } 10976 } 10977 10978 /** 10979 * Dispatch setActivated to all of this View's children. 10980 * 10981 * @see #setActivated(boolean) 10982 * 10983 * @param activated The new activated state 10984 */ 10985 protected void dispatchSetActivated(boolean activated) { 10986 } 10987 10988 /** 10989 * Indicates the activation state of this view. 10990 * 10991 * @return true if the view is activated, false otherwise 10992 */ 10993 @ViewDebug.ExportedProperty 10994 public boolean isActivated() { 10995 return (mPrivateFlags & ACTIVATED) != 0; 10996 } 10997 10998 /** 10999 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 11000 * observer can be used to get notifications when global events, like 11001 * layout, happen. 11002 * 11003 * The returned ViewTreeObserver observer is not guaranteed to remain 11004 * valid for the lifetime of this View. If the caller of this method keeps 11005 * a long-lived reference to ViewTreeObserver, it should always check for 11006 * the return value of {@link ViewTreeObserver#isAlive()}. 11007 * 11008 * @return The ViewTreeObserver for this view's hierarchy. 11009 */ 11010 public ViewTreeObserver getViewTreeObserver() { 11011 if (mAttachInfo != null) { 11012 return mAttachInfo.mTreeObserver; 11013 } 11014 if (mFloatingTreeObserver == null) { 11015 mFloatingTreeObserver = new ViewTreeObserver(); 11016 } 11017 return mFloatingTreeObserver; 11018 } 11019 11020 /** 11021 * <p>Finds the topmost view in the current view hierarchy.</p> 11022 * 11023 * @return the topmost view containing this view 11024 */ 11025 public View getRootView() { 11026 if (mAttachInfo != null) { 11027 final View v = mAttachInfo.mRootView; 11028 if (v != null) { 11029 return v; 11030 } 11031 } 11032 11033 View parent = this; 11034 11035 while (parent.mParent != null && parent.mParent instanceof View) { 11036 parent = (View) parent.mParent; 11037 } 11038 11039 return parent; 11040 } 11041 11042 /** 11043 * <p>Computes the coordinates of this view on the screen. The argument 11044 * must be an array of two integers. After the method returns, the array 11045 * contains the x and y location in that order.</p> 11046 * 11047 * @param location an array of two integers in which to hold the coordinates 11048 */ 11049 public void getLocationOnScreen(int[] location) { 11050 getLocationInWindow(location); 11051 11052 final AttachInfo info = mAttachInfo; 11053 if (info != null) { 11054 location[0] += info.mWindowLeft; 11055 location[1] += info.mWindowTop; 11056 } 11057 } 11058 11059 /** 11060 * <p>Computes the coordinates of this view in its window. The argument 11061 * must be an array of two integers. After the method returns, the array 11062 * contains the x and y location in that order.</p> 11063 * 11064 * @param location an array of two integers in which to hold the coordinates 11065 */ 11066 public void getLocationInWindow(int[] location) { 11067 if (location == null || location.length < 2) { 11068 throw new IllegalArgumentException("location must be an array of " 11069 + "two integers"); 11070 } 11071 11072 location[0] = mLeft + (int) (mTranslationX + 0.5f); 11073 location[1] = mTop + (int) (mTranslationY + 0.5f); 11074 11075 ViewParent viewParent = mParent; 11076 while (viewParent instanceof View) { 11077 final View view = (View)viewParent; 11078 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 11079 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 11080 viewParent = view.mParent; 11081 } 11082 11083 if (viewParent instanceof ViewAncestor) { 11084 // *cough* 11085 final ViewAncestor vr = (ViewAncestor)viewParent; 11086 location[1] -= vr.mCurScrollY; 11087 } 11088 } 11089 11090 /** 11091 * {@hide} 11092 * @param id the id of the view to be found 11093 * @return the view of the specified id, null if cannot be found 11094 */ 11095 protected View findViewTraversal(int id) { 11096 if (id == mID) { 11097 return this; 11098 } 11099 return null; 11100 } 11101 11102 /** 11103 * {@hide} 11104 * @param tag the tag of the view to be found 11105 * @return the view of specified tag, null if cannot be found 11106 */ 11107 protected View findViewWithTagTraversal(Object tag) { 11108 if (tag != null && tag.equals(mTag)) { 11109 return this; 11110 } 11111 return null; 11112 } 11113 11114 /** 11115 * {@hide} 11116 * @param predicate The predicate to evaluate. 11117 * @return The first view that matches the predicate or null. 11118 */ 11119 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 11120 if (predicate.apply(this)) { 11121 return this; 11122 } 11123 return null; 11124 } 11125 11126 /** 11127 * Look for a child view with the given id. If this view has the given 11128 * id, return this view. 11129 * 11130 * @param id The id to search for. 11131 * @return The view that has the given id in the hierarchy or null 11132 */ 11133 public final View findViewById(int id) { 11134 if (id < 0) { 11135 return null; 11136 } 11137 return findViewTraversal(id); 11138 } 11139 11140 /** 11141 * Look for a child view with the given tag. If this view has the given 11142 * tag, return this view. 11143 * 11144 * @param tag The tag to search for, using "tag.equals(getTag())". 11145 * @return The View that has the given tag in the hierarchy or null 11146 */ 11147 public final View findViewWithTag(Object tag) { 11148 if (tag == null) { 11149 return null; 11150 } 11151 return findViewWithTagTraversal(tag); 11152 } 11153 11154 /** 11155 * {@hide} 11156 * Look for a child view that matches the specified predicate. 11157 * If this view matches the predicate, return this view. 11158 * 11159 * @param predicate The predicate to evaluate. 11160 * @return The first view that matches the predicate or null. 11161 */ 11162 public final View findViewByPredicate(Predicate<View> predicate) { 11163 return findViewByPredicateTraversal(predicate); 11164 } 11165 11166 /** 11167 * Sets the identifier for this view. The identifier does not have to be 11168 * unique in this view's hierarchy. The identifier should be a positive 11169 * number. 11170 * 11171 * @see #NO_ID 11172 * @see #getId() 11173 * @see #findViewById(int) 11174 * 11175 * @param id a number used to identify the view 11176 * 11177 * @attr ref android.R.styleable#View_id 11178 */ 11179 public void setId(int id) { 11180 mID = id; 11181 } 11182 11183 /** 11184 * {@hide} 11185 * 11186 * @param isRoot true if the view belongs to the root namespace, false 11187 * otherwise 11188 */ 11189 public void setIsRootNamespace(boolean isRoot) { 11190 if (isRoot) { 11191 mPrivateFlags |= IS_ROOT_NAMESPACE; 11192 } else { 11193 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 11194 } 11195 } 11196 11197 /** 11198 * {@hide} 11199 * 11200 * @return true if the view belongs to the root namespace, false otherwise 11201 */ 11202 public boolean isRootNamespace() { 11203 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 11204 } 11205 11206 /** 11207 * Returns this view's identifier. 11208 * 11209 * @return a positive integer used to identify the view or {@link #NO_ID} 11210 * if the view has no ID 11211 * 11212 * @see #setId(int) 11213 * @see #findViewById(int) 11214 * @attr ref android.R.styleable#View_id 11215 */ 11216 @ViewDebug.CapturedViewProperty 11217 public int getId() { 11218 return mID; 11219 } 11220 11221 /** 11222 * Returns this view's tag. 11223 * 11224 * @return the Object stored in this view as a tag 11225 * 11226 * @see #setTag(Object) 11227 * @see #getTag(int) 11228 */ 11229 @ViewDebug.ExportedProperty 11230 public Object getTag() { 11231 return mTag; 11232 } 11233 11234 /** 11235 * Sets the tag associated with this view. A tag can be used to mark 11236 * a view in its hierarchy and does not have to be unique within the 11237 * hierarchy. Tags can also be used to store data within a view without 11238 * resorting to another data structure. 11239 * 11240 * @param tag an Object to tag the view with 11241 * 11242 * @see #getTag() 11243 * @see #setTag(int, Object) 11244 */ 11245 public void setTag(final Object tag) { 11246 mTag = tag; 11247 } 11248 11249 /** 11250 * Returns the tag associated with this view and the specified key. 11251 * 11252 * @param key The key identifying the tag 11253 * 11254 * @return the Object stored in this view as a tag 11255 * 11256 * @see #setTag(int, Object) 11257 * @see #getTag() 11258 */ 11259 public Object getTag(int key) { 11260 SparseArray<Object> tags = null; 11261 synchronized (sTagsLock) { 11262 if (sTags != null) { 11263 tags = sTags.get(this); 11264 } 11265 } 11266 11267 if (tags != null) return tags.get(key); 11268 return null; 11269 } 11270 11271 /** 11272 * Sets a tag associated with this view and a key. A tag can be used 11273 * to mark a view in its hierarchy and does not have to be unique within 11274 * the hierarchy. Tags can also be used to store data within a view 11275 * without resorting to another data structure. 11276 * 11277 * The specified key should be an id declared in the resources of the 11278 * application to ensure it is unique (see the <a 11279 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 11280 * Keys identified as belonging to 11281 * the Android framework or not associated with any package will cause 11282 * an {@link IllegalArgumentException} to be thrown. 11283 * 11284 * @param key The key identifying the tag 11285 * @param tag An Object to tag the view with 11286 * 11287 * @throws IllegalArgumentException If they specified key is not valid 11288 * 11289 * @see #setTag(Object) 11290 * @see #getTag(int) 11291 */ 11292 public void setTag(int key, final Object tag) { 11293 // If the package id is 0x00 or 0x01, it's either an undefined package 11294 // or a framework id 11295 if ((key >>> 24) < 2) { 11296 throw new IllegalArgumentException("The key must be an application-specific " 11297 + "resource id."); 11298 } 11299 11300 setTagInternal(this, key, tag); 11301 } 11302 11303 /** 11304 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 11305 * framework id. 11306 * 11307 * @hide 11308 */ 11309 public void setTagInternal(int key, Object tag) { 11310 if ((key >>> 24) != 0x1) { 11311 throw new IllegalArgumentException("The key must be a framework-specific " 11312 + "resource id."); 11313 } 11314 11315 setTagInternal(this, key, tag); 11316 } 11317 11318 private static void setTagInternal(View view, int key, Object tag) { 11319 SparseArray<Object> tags = null; 11320 synchronized (sTagsLock) { 11321 if (sTags == null) { 11322 sTags = new WeakHashMap<View, SparseArray<Object>>(); 11323 } else { 11324 tags = sTags.get(view); 11325 } 11326 } 11327 11328 if (tags == null) { 11329 tags = new SparseArray<Object>(2); 11330 synchronized (sTagsLock) { 11331 sTags.put(view, tags); 11332 } 11333 } 11334 11335 tags.put(key, tag); 11336 } 11337 11338 /** 11339 * @param consistency The type of consistency. See ViewDebug for more information. 11340 * 11341 * @hide 11342 */ 11343 protected boolean dispatchConsistencyCheck(int consistency) { 11344 return onConsistencyCheck(consistency); 11345 } 11346 11347 /** 11348 * Method that subclasses should implement to check their consistency. The type of 11349 * consistency check is indicated by the bit field passed as a parameter. 11350 * 11351 * @param consistency The type of consistency. See ViewDebug for more information. 11352 * 11353 * @throws IllegalStateException if the view is in an inconsistent state. 11354 * 11355 * @hide 11356 */ 11357 protected boolean onConsistencyCheck(int consistency) { 11358 boolean result = true; 11359 11360 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 11361 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 11362 11363 if (checkLayout) { 11364 if (getParent() == null) { 11365 result = false; 11366 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 11367 "View " + this + " does not have a parent."); 11368 } 11369 11370 if (mAttachInfo == null) { 11371 result = false; 11372 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 11373 "View " + this + " is not attached to a window."); 11374 } 11375 } 11376 11377 if (checkDrawing) { 11378 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 11379 // from their draw() method 11380 11381 if ((mPrivateFlags & DRAWN) != DRAWN && 11382 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 11383 result = false; 11384 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 11385 "View " + this + " was invalidated but its drawing cache is valid."); 11386 } 11387 } 11388 11389 return result; 11390 } 11391 11392 /** 11393 * Prints information about this view in the log output, with the tag 11394 * {@link #VIEW_LOG_TAG}. 11395 * 11396 * @hide 11397 */ 11398 public void debug() { 11399 debug(0); 11400 } 11401 11402 /** 11403 * Prints information about this view in the log output, with the tag 11404 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 11405 * indentation defined by the <code>depth</code>. 11406 * 11407 * @param depth the indentation level 11408 * 11409 * @hide 11410 */ 11411 protected void debug(int depth) { 11412 String output = debugIndent(depth - 1); 11413 11414 output += "+ " + this; 11415 int id = getId(); 11416 if (id != -1) { 11417 output += " (id=" + id + ")"; 11418 } 11419 Object tag = getTag(); 11420 if (tag != null) { 11421 output += " (tag=" + tag + ")"; 11422 } 11423 Log.d(VIEW_LOG_TAG, output); 11424 11425 if ((mPrivateFlags & FOCUSED) != 0) { 11426 output = debugIndent(depth) + " FOCUSED"; 11427 Log.d(VIEW_LOG_TAG, output); 11428 } 11429 11430 output = debugIndent(depth); 11431 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 11432 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 11433 + "} "; 11434 Log.d(VIEW_LOG_TAG, output); 11435 11436 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 11437 || mPaddingBottom != 0) { 11438 output = debugIndent(depth); 11439 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 11440 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 11441 Log.d(VIEW_LOG_TAG, output); 11442 } 11443 11444 output = debugIndent(depth); 11445 output += "mMeasureWidth=" + mMeasuredWidth + 11446 " mMeasureHeight=" + mMeasuredHeight; 11447 Log.d(VIEW_LOG_TAG, output); 11448 11449 output = debugIndent(depth); 11450 if (mLayoutParams == null) { 11451 output += "BAD! no layout params"; 11452 } else { 11453 output = mLayoutParams.debug(output); 11454 } 11455 Log.d(VIEW_LOG_TAG, output); 11456 11457 output = debugIndent(depth); 11458 output += "flags={"; 11459 output += View.printFlags(mViewFlags); 11460 output += "}"; 11461 Log.d(VIEW_LOG_TAG, output); 11462 11463 output = debugIndent(depth); 11464 output += "privateFlags={"; 11465 output += View.printPrivateFlags(mPrivateFlags); 11466 output += "}"; 11467 Log.d(VIEW_LOG_TAG, output); 11468 } 11469 11470 /** 11471 * Creates an string of whitespaces used for indentation. 11472 * 11473 * @param depth the indentation level 11474 * @return a String containing (depth * 2 + 3) * 2 white spaces 11475 * 11476 * @hide 11477 */ 11478 protected static String debugIndent(int depth) { 11479 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 11480 for (int i = 0; i < (depth * 2) + 3; i++) { 11481 spaces.append(' ').append(' '); 11482 } 11483 return spaces.toString(); 11484 } 11485 11486 /** 11487 * <p>Return the offset of the widget's text baseline from the widget's top 11488 * boundary. If this widget does not support baseline alignment, this 11489 * method returns -1. </p> 11490 * 11491 * @return the offset of the baseline within the widget's bounds or -1 11492 * if baseline alignment is not supported 11493 */ 11494 @ViewDebug.ExportedProperty(category = "layout") 11495 public int getBaseline() { 11496 return -1; 11497 } 11498 11499 /** 11500 * Call this when something has changed which has invalidated the 11501 * layout of this view. This will schedule a layout pass of the view 11502 * tree. 11503 */ 11504 public void requestLayout() { 11505 if (ViewDebug.TRACE_HIERARCHY) { 11506 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 11507 } 11508 11509 mPrivateFlags |= FORCE_LAYOUT; 11510 mPrivateFlags |= INVALIDATED; 11511 11512 if (mParent != null && !mParent.isLayoutRequested()) { 11513 mParent.requestLayout(); 11514 } 11515 } 11516 11517 /** 11518 * Forces this view to be laid out during the next layout pass. 11519 * This method does not call requestLayout() or forceLayout() 11520 * on the parent. 11521 */ 11522 public void forceLayout() { 11523 mPrivateFlags |= FORCE_LAYOUT; 11524 mPrivateFlags |= INVALIDATED; 11525 } 11526 11527 /** 11528 * <p> 11529 * This is called to find out how big a view should be. The parent 11530 * supplies constraint information in the width and height parameters. 11531 * </p> 11532 * 11533 * <p> 11534 * The actual mesurement work of a view is performed in 11535 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 11536 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 11537 * </p> 11538 * 11539 * 11540 * @param widthMeasureSpec Horizontal space requirements as imposed by the 11541 * parent 11542 * @param heightMeasureSpec Vertical space requirements as imposed by the 11543 * parent 11544 * 11545 * @see #onMeasure(int, int) 11546 */ 11547 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 11548 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 11549 widthMeasureSpec != mOldWidthMeasureSpec || 11550 heightMeasureSpec != mOldHeightMeasureSpec) { 11551 11552 // first clears the measured dimension flag 11553 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 11554 11555 if (ViewDebug.TRACE_HIERARCHY) { 11556 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 11557 } 11558 11559 // measure ourselves, this should set the measured dimension flag back 11560 onMeasure(widthMeasureSpec, heightMeasureSpec); 11561 11562 // flag not set, setMeasuredDimension() was not invoked, we raise 11563 // an exception to warn the developer 11564 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 11565 throw new IllegalStateException("onMeasure() did not set the" 11566 + " measured dimension by calling" 11567 + " setMeasuredDimension()"); 11568 } 11569 11570 mPrivateFlags |= LAYOUT_REQUIRED; 11571 } 11572 11573 mOldWidthMeasureSpec = widthMeasureSpec; 11574 mOldHeightMeasureSpec = heightMeasureSpec; 11575 } 11576 11577 /** 11578 * <p> 11579 * Measure the view and its content to determine the measured width and the 11580 * measured height. This method is invoked by {@link #measure(int, int)} and 11581 * should be overriden by subclasses to provide accurate and efficient 11582 * measurement of their contents. 11583 * </p> 11584 * 11585 * <p> 11586 * <strong>CONTRACT:</strong> When overriding this method, you 11587 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 11588 * measured width and height of this view. Failure to do so will trigger an 11589 * <code>IllegalStateException</code>, thrown by 11590 * {@link #measure(int, int)}. Calling the superclass' 11591 * {@link #onMeasure(int, int)} is a valid use. 11592 * </p> 11593 * 11594 * <p> 11595 * The base class implementation of measure defaults to the background size, 11596 * unless a larger size is allowed by the MeasureSpec. Subclasses should 11597 * override {@link #onMeasure(int, int)} to provide better measurements of 11598 * their content. 11599 * </p> 11600 * 11601 * <p> 11602 * If this method is overridden, it is the subclass's responsibility to make 11603 * sure the measured height and width are at least the view's minimum height 11604 * and width ({@link #getSuggestedMinimumHeight()} and 11605 * {@link #getSuggestedMinimumWidth()}). 11606 * </p> 11607 * 11608 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 11609 * The requirements are encoded with 11610 * {@link android.view.View.MeasureSpec}. 11611 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 11612 * The requirements are encoded with 11613 * {@link android.view.View.MeasureSpec}. 11614 * 11615 * @see #getMeasuredWidth() 11616 * @see #getMeasuredHeight() 11617 * @see #setMeasuredDimension(int, int) 11618 * @see #getSuggestedMinimumHeight() 11619 * @see #getSuggestedMinimumWidth() 11620 * @see android.view.View.MeasureSpec#getMode(int) 11621 * @see android.view.View.MeasureSpec#getSize(int) 11622 */ 11623 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 11624 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 11625 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 11626 } 11627 11628 /** 11629 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 11630 * measured width and measured height. Failing to do so will trigger an 11631 * exception at measurement time.</p> 11632 * 11633 * @param measuredWidth The measured width of this view. May be a complex 11634 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 11635 * {@link #MEASURED_STATE_TOO_SMALL}. 11636 * @param measuredHeight The measured height of this view. May be a complex 11637 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 11638 * {@link #MEASURED_STATE_TOO_SMALL}. 11639 */ 11640 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 11641 mMeasuredWidth = measuredWidth; 11642 mMeasuredHeight = measuredHeight; 11643 11644 mPrivateFlags |= MEASURED_DIMENSION_SET; 11645 } 11646 11647 /** 11648 * Merge two states as returned by {@link #getMeasuredState()}. 11649 * @param curState The current state as returned from a view or the result 11650 * of combining multiple views. 11651 * @param newState The new view state to combine. 11652 * @return Returns a new integer reflecting the combination of the two 11653 * states. 11654 */ 11655 public static int combineMeasuredStates(int curState, int newState) { 11656 return curState | newState; 11657 } 11658 11659 /** 11660 * Version of {@link #resolveSizeAndState(int, int, int)} 11661 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 11662 */ 11663 public static int resolveSize(int size, int measureSpec) { 11664 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 11665 } 11666 11667 /** 11668 * Utility to reconcile a desired size and state, with constraints imposed 11669 * by a MeasureSpec. Will take the desired size, unless a different size 11670 * is imposed by the constraints. The returned value is a compound integer, 11671 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 11672 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 11673 * size is smaller than the size the view wants to be. 11674 * 11675 * @param size How big the view wants to be 11676 * @param measureSpec Constraints imposed by the parent 11677 * @return Size information bit mask as defined by 11678 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 11679 */ 11680 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 11681 int result = size; 11682 int specMode = MeasureSpec.getMode(measureSpec); 11683 int specSize = MeasureSpec.getSize(measureSpec); 11684 switch (specMode) { 11685 case MeasureSpec.UNSPECIFIED: 11686 result = size; 11687 break; 11688 case MeasureSpec.AT_MOST: 11689 if (specSize < size) { 11690 result = specSize | MEASURED_STATE_TOO_SMALL; 11691 } else { 11692 result = size; 11693 } 11694 break; 11695 case MeasureSpec.EXACTLY: 11696 result = specSize; 11697 break; 11698 } 11699 return result | (childMeasuredState&MEASURED_STATE_MASK); 11700 } 11701 11702 /** 11703 * Utility to return a default size. Uses the supplied size if the 11704 * MeasureSpec imposed no constraints. Will get larger if allowed 11705 * by the MeasureSpec. 11706 * 11707 * @param size Default size for this view 11708 * @param measureSpec Constraints imposed by the parent 11709 * @return The size this view should be. 11710 */ 11711 public static int getDefaultSize(int size, int measureSpec) { 11712 int result = size; 11713 int specMode = MeasureSpec.getMode(measureSpec); 11714 int specSize = MeasureSpec.getSize(measureSpec); 11715 11716 switch (specMode) { 11717 case MeasureSpec.UNSPECIFIED: 11718 result = size; 11719 break; 11720 case MeasureSpec.AT_MOST: 11721 case MeasureSpec.EXACTLY: 11722 result = specSize; 11723 break; 11724 } 11725 return result; 11726 } 11727 11728 /** 11729 * Returns the suggested minimum height that the view should use. This 11730 * returns the maximum of the view's minimum height 11731 * and the background's minimum height 11732 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 11733 * <p> 11734 * When being used in {@link #onMeasure(int, int)}, the caller should still 11735 * ensure the returned height is within the requirements of the parent. 11736 * 11737 * @return The suggested minimum height of the view. 11738 */ 11739 protected int getSuggestedMinimumHeight() { 11740 int suggestedMinHeight = mMinHeight; 11741 11742 if (mBGDrawable != null) { 11743 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 11744 if (suggestedMinHeight < bgMinHeight) { 11745 suggestedMinHeight = bgMinHeight; 11746 } 11747 } 11748 11749 return suggestedMinHeight; 11750 } 11751 11752 /** 11753 * Returns the suggested minimum width that the view should use. This 11754 * returns the maximum of the view's minimum width) 11755 * and the background's minimum width 11756 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 11757 * <p> 11758 * When being used in {@link #onMeasure(int, int)}, the caller should still 11759 * ensure the returned width is within the requirements of the parent. 11760 * 11761 * @return The suggested minimum width of the view. 11762 */ 11763 protected int getSuggestedMinimumWidth() { 11764 int suggestedMinWidth = mMinWidth; 11765 11766 if (mBGDrawable != null) { 11767 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 11768 if (suggestedMinWidth < bgMinWidth) { 11769 suggestedMinWidth = bgMinWidth; 11770 } 11771 } 11772 11773 return suggestedMinWidth; 11774 } 11775 11776 /** 11777 * Sets the minimum height of the view. It is not guaranteed the view will 11778 * be able to achieve this minimum height (for example, if its parent layout 11779 * constrains it with less available height). 11780 * 11781 * @param minHeight The minimum height the view will try to be. 11782 */ 11783 public void setMinimumHeight(int minHeight) { 11784 mMinHeight = minHeight; 11785 } 11786 11787 /** 11788 * Sets the minimum width of the view. It is not guaranteed the view will 11789 * be able to achieve this minimum width (for example, if its parent layout 11790 * constrains it with less available width). 11791 * 11792 * @param minWidth The minimum width the view will try to be. 11793 */ 11794 public void setMinimumWidth(int minWidth) { 11795 mMinWidth = minWidth; 11796 } 11797 11798 /** 11799 * Get the animation currently associated with this view. 11800 * 11801 * @return The animation that is currently playing or 11802 * scheduled to play for this view. 11803 */ 11804 public Animation getAnimation() { 11805 return mCurrentAnimation; 11806 } 11807 11808 /** 11809 * Start the specified animation now. 11810 * 11811 * @param animation the animation to start now 11812 */ 11813 public void startAnimation(Animation animation) { 11814 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 11815 setAnimation(animation); 11816 invalidateParentCaches(); 11817 invalidate(true); 11818 } 11819 11820 /** 11821 * Cancels any animations for this view. 11822 */ 11823 public void clearAnimation() { 11824 if (mCurrentAnimation != null) { 11825 mCurrentAnimation.detach(); 11826 } 11827 mCurrentAnimation = null; 11828 invalidateParentIfNeeded(); 11829 } 11830 11831 /** 11832 * Sets the next animation to play for this view. 11833 * If you want the animation to play immediately, use 11834 * startAnimation. This method provides allows fine-grained 11835 * control over the start time and invalidation, but you 11836 * must make sure that 1) the animation has a start time set, and 11837 * 2) the view will be invalidated when the animation is supposed to 11838 * start. 11839 * 11840 * @param animation The next animation, or null. 11841 */ 11842 public void setAnimation(Animation animation) { 11843 mCurrentAnimation = animation; 11844 if (animation != null) { 11845 animation.reset(); 11846 } 11847 } 11848 11849 /** 11850 * Invoked by a parent ViewGroup to notify the start of the animation 11851 * currently associated with this view. If you override this method, 11852 * always call super.onAnimationStart(); 11853 * 11854 * @see #setAnimation(android.view.animation.Animation) 11855 * @see #getAnimation() 11856 */ 11857 protected void onAnimationStart() { 11858 mPrivateFlags |= ANIMATION_STARTED; 11859 } 11860 11861 /** 11862 * Invoked by a parent ViewGroup to notify the end of the animation 11863 * currently associated with this view. If you override this method, 11864 * always call super.onAnimationEnd(); 11865 * 11866 * @see #setAnimation(android.view.animation.Animation) 11867 * @see #getAnimation() 11868 */ 11869 protected void onAnimationEnd() { 11870 mPrivateFlags &= ~ANIMATION_STARTED; 11871 } 11872 11873 /** 11874 * Invoked if there is a Transform that involves alpha. Subclass that can 11875 * draw themselves with the specified alpha should return true, and then 11876 * respect that alpha when their onDraw() is called. If this returns false 11877 * then the view may be redirected to draw into an offscreen buffer to 11878 * fulfill the request, which will look fine, but may be slower than if the 11879 * subclass handles it internally. The default implementation returns false. 11880 * 11881 * @param alpha The alpha (0..255) to apply to the view's drawing 11882 * @return true if the view can draw with the specified alpha. 11883 */ 11884 protected boolean onSetAlpha(int alpha) { 11885 return false; 11886 } 11887 11888 /** 11889 * This is used by the RootView to perform an optimization when 11890 * the view hierarchy contains one or several SurfaceView. 11891 * SurfaceView is always considered transparent, but its children are not, 11892 * therefore all View objects remove themselves from the global transparent 11893 * region (passed as a parameter to this function). 11894 * 11895 * @param region The transparent region for this ViewAncestor (window). 11896 * 11897 * @return Returns true if the effective visibility of the view at this 11898 * point is opaque, regardless of the transparent region; returns false 11899 * if it is possible for underlying windows to be seen behind the view. 11900 * 11901 * {@hide} 11902 */ 11903 public boolean gatherTransparentRegion(Region region) { 11904 final AttachInfo attachInfo = mAttachInfo; 11905 if (region != null && attachInfo != null) { 11906 final int pflags = mPrivateFlags; 11907 if ((pflags & SKIP_DRAW) == 0) { 11908 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 11909 // remove it from the transparent region. 11910 final int[] location = attachInfo.mTransparentLocation; 11911 getLocationInWindow(location); 11912 region.op(location[0], location[1], location[0] + mRight - mLeft, 11913 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 11914 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 11915 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 11916 // exists, so we remove the background drawable's non-transparent 11917 // parts from this transparent region. 11918 applyDrawableToTransparentRegion(mBGDrawable, region); 11919 } 11920 } 11921 return true; 11922 } 11923 11924 /** 11925 * Play a sound effect for this view. 11926 * 11927 * <p>The framework will play sound effects for some built in actions, such as 11928 * clicking, but you may wish to play these effects in your widget, 11929 * for instance, for internal navigation. 11930 * 11931 * <p>The sound effect will only be played if sound effects are enabled by the user, and 11932 * {@link #isSoundEffectsEnabled()} is true. 11933 * 11934 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 11935 */ 11936 public void playSoundEffect(int soundConstant) { 11937 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 11938 return; 11939 } 11940 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 11941 } 11942 11943 /** 11944 * BZZZTT!!1! 11945 * 11946 * <p>Provide haptic feedback to the user for this view. 11947 * 11948 * <p>The framework will provide haptic feedback for some built in actions, 11949 * such as long presses, but you may wish to provide feedback for your 11950 * own widget. 11951 * 11952 * <p>The feedback will only be performed if 11953 * {@link #isHapticFeedbackEnabled()} is true. 11954 * 11955 * @param feedbackConstant One of the constants defined in 11956 * {@link HapticFeedbackConstants} 11957 */ 11958 public boolean performHapticFeedback(int feedbackConstant) { 11959 return performHapticFeedback(feedbackConstant, 0); 11960 } 11961 11962 /** 11963 * BZZZTT!!1! 11964 * 11965 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 11966 * 11967 * @param feedbackConstant One of the constants defined in 11968 * {@link HapticFeedbackConstants} 11969 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 11970 */ 11971 public boolean performHapticFeedback(int feedbackConstant, int flags) { 11972 if (mAttachInfo == null) { 11973 return false; 11974 } 11975 //noinspection SimplifiableIfStatement 11976 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 11977 && !isHapticFeedbackEnabled()) { 11978 return false; 11979 } 11980 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 11981 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 11982 } 11983 11984 /** 11985 * Request that the visibility of the status bar be changed. 11986 * @param visibility Either {@link #STATUS_BAR_VISIBLE} or {@link #STATUS_BAR_HIDDEN}. 11987 */ 11988 public void setSystemUiVisibility(int visibility) { 11989 if (visibility != mSystemUiVisibility) { 11990 mSystemUiVisibility = visibility; 11991 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 11992 mParent.recomputeViewAttributes(this); 11993 } 11994 } 11995 } 11996 11997 /** 11998 * Returns the status bar visibility that this view has requested. 11999 * @return Either {@link #STATUS_BAR_VISIBLE} or {@link #STATUS_BAR_HIDDEN}. 12000 */ 12001 public int getSystemUiVisibility() { 12002 return mSystemUiVisibility; 12003 } 12004 12005 /** 12006 * Set a listener to receive callbacks when the visibility of the system bar changes. 12007 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 12008 */ 12009 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 12010 mOnSystemUiVisibilityChangeListener = l; 12011 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12012 mParent.recomputeViewAttributes(this); 12013 } 12014 } 12015 12016 /** 12017 */ 12018 public void dispatchSystemUiVisibilityChanged(int visibility) { 12019 if (mOnSystemUiVisibilityChangeListener != null) { 12020 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 12021 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 12022 } 12023 } 12024 12025 /** 12026 * Creates an image that the system displays during the drag and drop 12027 * operation. This is called a "drag shadow". The default implementation 12028 * for a DragShadowBuilder based on a View returns an image that has exactly the same 12029 * appearance as the given View. The default also positions the center of the drag shadow 12030 * directly under the touch point. If no View is provided (the constructor with no parameters 12031 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 12032 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 12033 * default is an invisible drag shadow. 12034 * <p> 12035 * You are not required to use the View you provide to the constructor as the basis of the 12036 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 12037 * anything you want as the drag shadow. 12038 * </p> 12039 * <p> 12040 * You pass a DragShadowBuilder object to the system when you start the drag. The system 12041 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 12042 * size and position of the drag shadow. It uses this data to construct a 12043 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 12044 * so that your application can draw the shadow image in the Canvas. 12045 * </p> 12046 */ 12047 public static class DragShadowBuilder { 12048 private final WeakReference<View> mView; 12049 12050 /** 12051 * Constructs a shadow image builder based on a View. By default, the resulting drag 12052 * shadow will have the same appearance and dimensions as the View, with the touch point 12053 * over the center of the View. 12054 * @param view A View. Any View in scope can be used. 12055 */ 12056 public DragShadowBuilder(View view) { 12057 mView = new WeakReference<View>(view); 12058 } 12059 12060 /** 12061 * Construct a shadow builder object with no associated View. This 12062 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 12063 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 12064 * to supply the drag shadow's dimensions and appearance without 12065 * reference to any View object. If they are not overridden, then the result is an 12066 * invisible drag shadow. 12067 */ 12068 public DragShadowBuilder() { 12069 mView = new WeakReference<View>(null); 12070 } 12071 12072 /** 12073 * Returns the View object that had been passed to the 12074 * {@link #View.DragShadowBuilder(View)} 12075 * constructor. If that View parameter was {@code null} or if the 12076 * {@link #View.DragShadowBuilder()} 12077 * constructor was used to instantiate the builder object, this method will return 12078 * null. 12079 * 12080 * @return The View object associate with this builder object. 12081 */ 12082 @SuppressWarnings({"JavadocReference"}) 12083 final public View getView() { 12084 return mView.get(); 12085 } 12086 12087 /** 12088 * Provides the metrics for the shadow image. These include the dimensions of 12089 * the shadow image, and the point within that shadow that should 12090 * be centered under the touch location while dragging. 12091 * <p> 12092 * The default implementation sets the dimensions of the shadow to be the 12093 * same as the dimensions of the View itself and centers the shadow under 12094 * the touch point. 12095 * </p> 12096 * 12097 * @param shadowSize A {@link android.graphics.Point} containing the width and height 12098 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 12099 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 12100 * image. 12101 * 12102 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 12103 * shadow image that should be underneath the touch point during the drag and drop 12104 * operation. Your application must set {@link android.graphics.Point#x} to the 12105 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 12106 */ 12107 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 12108 final View view = mView.get(); 12109 if (view != null) { 12110 shadowSize.set(view.getWidth(), view.getHeight()); 12111 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 12112 } else { 12113 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 12114 } 12115 } 12116 12117 /** 12118 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 12119 * based on the dimensions it received from the 12120 * {@link #onProvideShadowMetrics(Point, Point)} callback. 12121 * 12122 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 12123 */ 12124 public void onDrawShadow(Canvas canvas) { 12125 final View view = mView.get(); 12126 if (view != null) { 12127 view.draw(canvas); 12128 } else { 12129 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 12130 } 12131 } 12132 } 12133 12134 /** 12135 * Starts a drag and drop operation. When your application calls this method, it passes a 12136 * {@link android.view.View.DragShadowBuilder} object to the system. The 12137 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 12138 * to get metrics for the drag shadow, and then calls the object's 12139 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 12140 * <p> 12141 * Once the system has the drag shadow, it begins the drag and drop operation by sending 12142 * drag events to all the View objects in your application that are currently visible. It does 12143 * this either by calling the View object's drag listener (an implementation of 12144 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 12145 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 12146 * Both are passed a {@link android.view.DragEvent} object that has a 12147 * {@link android.view.DragEvent#getAction()} value of 12148 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 12149 * </p> 12150 * <p> 12151 * Your application can invoke startDrag() on any attached View object. The View object does not 12152 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 12153 * be related to the View the user selected for dragging. 12154 * </p> 12155 * @param data A {@link android.content.ClipData} object pointing to the data to be 12156 * transferred by the drag and drop operation. 12157 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 12158 * drag shadow. 12159 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 12160 * drop operation. This Object is put into every DragEvent object sent by the system during the 12161 * current drag. 12162 * <p> 12163 * myLocalState is a lightweight mechanism for the sending information from the dragged View 12164 * to the target Views. For example, it can contain flags that differentiate between a 12165 * a copy operation and a move operation. 12166 * </p> 12167 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 12168 * so the parameter should be set to 0. 12169 * @return {@code true} if the method completes successfully, or 12170 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 12171 * do a drag, and so no drag operation is in progress. 12172 */ 12173 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 12174 Object myLocalState, int flags) { 12175 if (ViewDebug.DEBUG_DRAG) { 12176 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 12177 } 12178 boolean okay = false; 12179 12180 Point shadowSize = new Point(); 12181 Point shadowTouchPoint = new Point(); 12182 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 12183 12184 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 12185 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 12186 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 12187 } 12188 12189 if (ViewDebug.DEBUG_DRAG) { 12190 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 12191 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 12192 } 12193 Surface surface = new Surface(); 12194 try { 12195 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 12196 flags, shadowSize.x, shadowSize.y, surface); 12197 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 12198 + " surface=" + surface); 12199 if (token != null) { 12200 Canvas canvas = surface.lockCanvas(null); 12201 try { 12202 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 12203 shadowBuilder.onDrawShadow(canvas); 12204 } finally { 12205 surface.unlockCanvasAndPost(canvas); 12206 } 12207 12208 final ViewAncestor root = getViewAncestor(); 12209 12210 // Cache the local state object for delivery with DragEvents 12211 root.setLocalDragState(myLocalState); 12212 12213 // repurpose 'shadowSize' for the last touch point 12214 root.getLastTouchPoint(shadowSize); 12215 12216 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 12217 shadowSize.x, shadowSize.y, 12218 shadowTouchPoint.x, shadowTouchPoint.y, data); 12219 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 12220 } 12221 } catch (Exception e) { 12222 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 12223 surface.destroy(); 12224 } 12225 12226 return okay; 12227 } 12228 12229 /** 12230 * Handles drag events sent by the system following a call to 12231 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 12232 *<p> 12233 * When the system calls this method, it passes a 12234 * {@link android.view.DragEvent} object. A call to 12235 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 12236 * in DragEvent. The method uses these to determine what is happening in the drag and drop 12237 * operation. 12238 * @param event The {@link android.view.DragEvent} sent by the system. 12239 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 12240 * in DragEvent, indicating the type of drag event represented by this object. 12241 * @return {@code true} if the method was successful, otherwise {@code false}. 12242 * <p> 12243 * The method should return {@code true} in response to an action type of 12244 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 12245 * operation. 12246 * </p> 12247 * <p> 12248 * The method should also return {@code true} in response to an action type of 12249 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 12250 * {@code false} if it didn't. 12251 * </p> 12252 */ 12253 public boolean onDragEvent(DragEvent event) { 12254 return false; 12255 } 12256 12257 /** 12258 * Detects if this View is enabled and has a drag event listener. 12259 * If both are true, then it calls the drag event listener with the 12260 * {@link android.view.DragEvent} it received. If the drag event listener returns 12261 * {@code true}, then dispatchDragEvent() returns {@code true}. 12262 * <p> 12263 * For all other cases, the method calls the 12264 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 12265 * method and returns its result. 12266 * </p> 12267 * <p> 12268 * This ensures that a drag event is always consumed, even if the View does not have a drag 12269 * event listener. However, if the View has a listener and the listener returns true, then 12270 * onDragEvent() is not called. 12271 * </p> 12272 */ 12273 public boolean dispatchDragEvent(DragEvent event) { 12274 //noinspection SimplifiableIfStatement 12275 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 12276 && mOnDragListener.onDrag(this, event)) { 12277 return true; 12278 } 12279 return onDragEvent(event); 12280 } 12281 12282 boolean canAcceptDrag() { 12283 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 12284 } 12285 12286 /** 12287 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 12288 * it is ever exposed at all. 12289 * @hide 12290 */ 12291 public void onCloseSystemDialogs(String reason) { 12292 } 12293 12294 /** 12295 * Given a Drawable whose bounds have been set to draw into this view, 12296 * update a Region being computed for 12297 * {@link #gatherTransparentRegion(android.graphics.Region)} so 12298 * that any non-transparent parts of the Drawable are removed from the 12299 * given transparent region. 12300 * 12301 * @param dr The Drawable whose transparency is to be applied to the region. 12302 * @param region A Region holding the current transparency information, 12303 * where any parts of the region that are set are considered to be 12304 * transparent. On return, this region will be modified to have the 12305 * transparency information reduced by the corresponding parts of the 12306 * Drawable that are not transparent. 12307 * {@hide} 12308 */ 12309 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 12310 if (DBG) { 12311 Log.i("View", "Getting transparent region for: " + this); 12312 } 12313 final Region r = dr.getTransparentRegion(); 12314 final Rect db = dr.getBounds(); 12315 final AttachInfo attachInfo = mAttachInfo; 12316 if (r != null && attachInfo != null) { 12317 final int w = getRight()-getLeft(); 12318 final int h = getBottom()-getTop(); 12319 if (db.left > 0) { 12320 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 12321 r.op(0, 0, db.left, h, Region.Op.UNION); 12322 } 12323 if (db.right < w) { 12324 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 12325 r.op(db.right, 0, w, h, Region.Op.UNION); 12326 } 12327 if (db.top > 0) { 12328 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 12329 r.op(0, 0, w, db.top, Region.Op.UNION); 12330 } 12331 if (db.bottom < h) { 12332 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 12333 r.op(0, db.bottom, w, h, Region.Op.UNION); 12334 } 12335 final int[] location = attachInfo.mTransparentLocation; 12336 getLocationInWindow(location); 12337 r.translate(location[0], location[1]); 12338 region.op(r, Region.Op.INTERSECT); 12339 } else { 12340 region.op(db, Region.Op.DIFFERENCE); 12341 } 12342 } 12343 12344 private void checkForLongClick(int delayOffset) { 12345 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 12346 mHasPerformedLongPress = false; 12347 12348 if (mPendingCheckForLongPress == null) { 12349 mPendingCheckForLongPress = new CheckForLongPress(); 12350 } 12351 mPendingCheckForLongPress.rememberWindowAttachCount(); 12352 postDelayed(mPendingCheckForLongPress, 12353 ViewConfiguration.getLongPressTimeout() - delayOffset); 12354 } 12355 } 12356 12357 /** 12358 * Inflate a view from an XML resource. This convenience method wraps the {@link 12359 * LayoutInflater} class, which provides a full range of options for view inflation. 12360 * 12361 * @param context The Context object for your activity or application. 12362 * @param resource The resource ID to inflate 12363 * @param root A view group that will be the parent. Used to properly inflate the 12364 * layout_* parameters. 12365 * @see LayoutInflater 12366 */ 12367 public static View inflate(Context context, int resource, ViewGroup root) { 12368 LayoutInflater factory = LayoutInflater.from(context); 12369 return factory.inflate(resource, root); 12370 } 12371 12372 /** 12373 * Scroll the view with standard behavior for scrolling beyond the normal 12374 * content boundaries. Views that call this method should override 12375 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 12376 * results of an over-scroll operation. 12377 * 12378 * Views can use this method to handle any touch or fling-based scrolling. 12379 * 12380 * @param deltaX Change in X in pixels 12381 * @param deltaY Change in Y in pixels 12382 * @param scrollX Current X scroll value in pixels before applying deltaX 12383 * @param scrollY Current Y scroll value in pixels before applying deltaY 12384 * @param scrollRangeX Maximum content scroll range along the X axis 12385 * @param scrollRangeY Maximum content scroll range along the Y axis 12386 * @param maxOverScrollX Number of pixels to overscroll by in either direction 12387 * along the X axis. 12388 * @param maxOverScrollY Number of pixels to overscroll by in either direction 12389 * along the Y axis. 12390 * @param isTouchEvent true if this scroll operation is the result of a touch event. 12391 * @return true if scrolling was clamped to an over-scroll boundary along either 12392 * axis, false otherwise. 12393 */ 12394 @SuppressWarnings({"UnusedParameters"}) 12395 protected boolean overScrollBy(int deltaX, int deltaY, 12396 int scrollX, int scrollY, 12397 int scrollRangeX, int scrollRangeY, 12398 int maxOverScrollX, int maxOverScrollY, 12399 boolean isTouchEvent) { 12400 final int overScrollMode = mOverScrollMode; 12401 final boolean canScrollHorizontal = 12402 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 12403 final boolean canScrollVertical = 12404 computeVerticalScrollRange() > computeVerticalScrollExtent(); 12405 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 12406 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 12407 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 12408 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 12409 12410 int newScrollX = scrollX + deltaX; 12411 if (!overScrollHorizontal) { 12412 maxOverScrollX = 0; 12413 } 12414 12415 int newScrollY = scrollY + deltaY; 12416 if (!overScrollVertical) { 12417 maxOverScrollY = 0; 12418 } 12419 12420 // Clamp values if at the limits and record 12421 final int left = -maxOverScrollX; 12422 final int right = maxOverScrollX + scrollRangeX; 12423 final int top = -maxOverScrollY; 12424 final int bottom = maxOverScrollY + scrollRangeY; 12425 12426 boolean clampedX = false; 12427 if (newScrollX > right) { 12428 newScrollX = right; 12429 clampedX = true; 12430 } else if (newScrollX < left) { 12431 newScrollX = left; 12432 clampedX = true; 12433 } 12434 12435 boolean clampedY = false; 12436 if (newScrollY > bottom) { 12437 newScrollY = bottom; 12438 clampedY = true; 12439 } else if (newScrollY < top) { 12440 newScrollY = top; 12441 clampedY = true; 12442 } 12443 12444 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 12445 12446 return clampedX || clampedY; 12447 } 12448 12449 /** 12450 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 12451 * respond to the results of an over-scroll operation. 12452 * 12453 * @param scrollX New X scroll value in pixels 12454 * @param scrollY New Y scroll value in pixels 12455 * @param clampedX True if scrollX was clamped to an over-scroll boundary 12456 * @param clampedY True if scrollY was clamped to an over-scroll boundary 12457 */ 12458 protected void onOverScrolled(int scrollX, int scrollY, 12459 boolean clampedX, boolean clampedY) { 12460 // Intentionally empty. 12461 } 12462 12463 /** 12464 * Returns the over-scroll mode for this view. The result will be 12465 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 12466 * (allow over-scrolling only if the view content is larger than the container), 12467 * or {@link #OVER_SCROLL_NEVER}. 12468 * 12469 * @return This view's over-scroll mode. 12470 */ 12471 public int getOverScrollMode() { 12472 return mOverScrollMode; 12473 } 12474 12475 /** 12476 * Set the over-scroll mode for this view. Valid over-scroll modes are 12477 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 12478 * (allow over-scrolling only if the view content is larger than the container), 12479 * or {@link #OVER_SCROLL_NEVER}. 12480 * 12481 * Setting the over-scroll mode of a view will have an effect only if the 12482 * view is capable of scrolling. 12483 * 12484 * @param overScrollMode The new over-scroll mode for this view. 12485 */ 12486 public void setOverScrollMode(int overScrollMode) { 12487 if (overScrollMode != OVER_SCROLL_ALWAYS && 12488 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 12489 overScrollMode != OVER_SCROLL_NEVER) { 12490 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 12491 } 12492 mOverScrollMode = overScrollMode; 12493 } 12494 12495 /** 12496 * Gets a scale factor that determines the distance the view should scroll 12497 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 12498 * @return The vertical scroll scale factor. 12499 * @hide 12500 */ 12501 protected float getVerticalScrollFactor() { 12502 if (mVerticalScrollFactor == 0) { 12503 TypedValue outValue = new TypedValue(); 12504 if (!mContext.getTheme().resolveAttribute( 12505 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 12506 throw new IllegalStateException( 12507 "Expected theme to define listPreferredItemHeight."); 12508 } 12509 mVerticalScrollFactor = outValue.getDimension( 12510 mContext.getResources().getDisplayMetrics()); 12511 } 12512 return mVerticalScrollFactor; 12513 } 12514 12515 /** 12516 * Gets a scale factor that determines the distance the view should scroll 12517 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 12518 * @return The horizontal scroll scale factor. 12519 * @hide 12520 */ 12521 protected float getHorizontalScrollFactor() { 12522 // TODO: Should use something else. 12523 return getVerticalScrollFactor(); 12524 } 12525 12526 // 12527 // Properties 12528 // 12529 /** 12530 * A Property wrapper around the <code>alpha</code> functionality handled by the 12531 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 12532 */ 12533 static Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 12534 @Override 12535 public void setValue(View object, float value) { 12536 object.setAlpha(value); 12537 } 12538 12539 @Override 12540 public Float get(View object) { 12541 return object.getAlpha(); 12542 } 12543 }; 12544 12545 /** 12546 * A Property wrapper around the <code>translationX</code> functionality handled by the 12547 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 12548 */ 12549 public static Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 12550 @Override 12551 public void setValue(View object, float value) { 12552 object.setTranslationX(value); 12553 } 12554 12555 @Override 12556 public Float get(View object) { 12557 return object.getTranslationX(); 12558 } 12559 }; 12560 12561 /** 12562 * A Property wrapper around the <code>translationY</code> functionality handled by the 12563 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 12564 */ 12565 public static Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 12566 @Override 12567 public void setValue(View object, float value) { 12568 object.setTranslationY(value); 12569 } 12570 12571 @Override 12572 public Float get(View object) { 12573 return object.getTranslationY(); 12574 } 12575 }; 12576 12577 /** 12578 * A Property wrapper around the <code>x</code> functionality handled by the 12579 * {@link View#setX(float)} and {@link View#getX()} methods. 12580 */ 12581 public static Property<View, Float> X = new FloatProperty<View>("x") { 12582 @Override 12583 public void setValue(View object, float value) { 12584 object.setX(value); 12585 } 12586 12587 @Override 12588 public Float get(View object) { 12589 return object.getX(); 12590 } 12591 }; 12592 12593 /** 12594 * A Property wrapper around the <code>y</code> functionality handled by the 12595 * {@link View#setY(float)} and {@link View#getY()} methods. 12596 */ 12597 public static Property<View, Float> Y = new FloatProperty<View>("y") { 12598 @Override 12599 public void setValue(View object, float value) { 12600 object.setY(value); 12601 } 12602 12603 @Override 12604 public Float get(View object) { 12605 return object.getY(); 12606 } 12607 }; 12608 12609 /** 12610 * A Property wrapper around the <code>rotation</code> functionality handled by the 12611 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 12612 */ 12613 public static Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 12614 @Override 12615 public void setValue(View object, float value) { 12616 object.setRotation(value); 12617 } 12618 12619 @Override 12620 public Float get(View object) { 12621 return object.getRotation(); 12622 } 12623 }; 12624 12625 /** 12626 * A Property wrapper around the <code>rotationX</code> functionality handled by the 12627 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 12628 */ 12629 public static Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 12630 @Override 12631 public void setValue(View object, float value) { 12632 object.setRotationX(value); 12633 } 12634 12635 @Override 12636 public Float get(View object) { 12637 return object.getRotationX(); 12638 } 12639 }; 12640 12641 /** 12642 * A Property wrapper around the <code>rotationY</code> functionality handled by the 12643 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 12644 */ 12645 public static Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 12646 @Override 12647 public void setValue(View object, float value) { 12648 object.setRotationY(value); 12649 } 12650 12651 @Override 12652 public Float get(View object) { 12653 return object.getRotationY(); 12654 } 12655 }; 12656 12657 /** 12658 * A Property wrapper around the <code>scaleX</code> functionality handled by the 12659 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 12660 */ 12661 public static Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 12662 @Override 12663 public void setValue(View object, float value) { 12664 object.setScaleX(value); 12665 } 12666 12667 @Override 12668 public Float get(View object) { 12669 return object.getScaleX(); 12670 } 12671 }; 12672 12673 /** 12674 * A Property wrapper around the <code>scaleY</code> functionality handled by the 12675 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 12676 */ 12677 public static Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 12678 @Override 12679 public void setValue(View object, float value) { 12680 object.setScaleY(value); 12681 } 12682 12683 @Override 12684 public Float get(View object) { 12685 return object.getScaleY(); 12686 } 12687 }; 12688 12689 /** 12690 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 12691 * Each MeasureSpec represents a requirement for either the width or the height. 12692 * A MeasureSpec is comprised of a size and a mode. There are three possible 12693 * modes: 12694 * <dl> 12695 * <dt>UNSPECIFIED</dt> 12696 * <dd> 12697 * The parent has not imposed any constraint on the child. It can be whatever size 12698 * it wants. 12699 * </dd> 12700 * 12701 * <dt>EXACTLY</dt> 12702 * <dd> 12703 * The parent has determined an exact size for the child. The child is going to be 12704 * given those bounds regardless of how big it wants to be. 12705 * </dd> 12706 * 12707 * <dt>AT_MOST</dt> 12708 * <dd> 12709 * The child can be as large as it wants up to the specified size. 12710 * </dd> 12711 * </dl> 12712 * 12713 * MeasureSpecs are implemented as ints to reduce object allocation. This class 12714 * is provided to pack and unpack the <size, mode> tuple into the int. 12715 */ 12716 public static class MeasureSpec { 12717 private static final int MODE_SHIFT = 30; 12718 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 12719 12720 /** 12721 * Measure specification mode: The parent has not imposed any constraint 12722 * on the child. It can be whatever size it wants. 12723 */ 12724 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 12725 12726 /** 12727 * Measure specification mode: The parent has determined an exact size 12728 * for the child. The child is going to be given those bounds regardless 12729 * of how big it wants to be. 12730 */ 12731 public static final int EXACTLY = 1 << MODE_SHIFT; 12732 12733 /** 12734 * Measure specification mode: The child can be as large as it wants up 12735 * to the specified size. 12736 */ 12737 public static final int AT_MOST = 2 << MODE_SHIFT; 12738 12739 /** 12740 * Creates a measure specification based on the supplied size and mode. 12741 * 12742 * The mode must always be one of the following: 12743 * <ul> 12744 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 12745 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 12746 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 12747 * </ul> 12748 * 12749 * @param size the size of the measure specification 12750 * @param mode the mode of the measure specification 12751 * @return the measure specification based on size and mode 12752 */ 12753 public static int makeMeasureSpec(int size, int mode) { 12754 return size + mode; 12755 } 12756 12757 /** 12758 * Extracts the mode from the supplied measure specification. 12759 * 12760 * @param measureSpec the measure specification to extract the mode from 12761 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 12762 * {@link android.view.View.MeasureSpec#AT_MOST} or 12763 * {@link android.view.View.MeasureSpec#EXACTLY} 12764 */ 12765 public static int getMode(int measureSpec) { 12766 return (measureSpec & MODE_MASK); 12767 } 12768 12769 /** 12770 * Extracts the size from the supplied measure specification. 12771 * 12772 * @param measureSpec the measure specification to extract the size from 12773 * @return the size in pixels defined in the supplied measure specification 12774 */ 12775 public static int getSize(int measureSpec) { 12776 return (measureSpec & ~MODE_MASK); 12777 } 12778 12779 /** 12780 * Returns a String representation of the specified measure 12781 * specification. 12782 * 12783 * @param measureSpec the measure specification to convert to a String 12784 * @return a String with the following format: "MeasureSpec: MODE SIZE" 12785 */ 12786 public static String toString(int measureSpec) { 12787 int mode = getMode(measureSpec); 12788 int size = getSize(measureSpec); 12789 12790 StringBuilder sb = new StringBuilder("MeasureSpec: "); 12791 12792 if (mode == UNSPECIFIED) 12793 sb.append("UNSPECIFIED "); 12794 else if (mode == EXACTLY) 12795 sb.append("EXACTLY "); 12796 else if (mode == AT_MOST) 12797 sb.append("AT_MOST "); 12798 else 12799 sb.append(mode).append(" "); 12800 12801 sb.append(size); 12802 return sb.toString(); 12803 } 12804 } 12805 12806 class CheckForLongPress implements Runnable { 12807 12808 private int mOriginalWindowAttachCount; 12809 12810 public void run() { 12811 if (isPressed() && (mParent != null) 12812 && mOriginalWindowAttachCount == mWindowAttachCount) { 12813 if (performLongClick()) { 12814 mHasPerformedLongPress = true; 12815 } 12816 } 12817 } 12818 12819 public void rememberWindowAttachCount() { 12820 mOriginalWindowAttachCount = mWindowAttachCount; 12821 } 12822 } 12823 12824 private final class CheckForTap implements Runnable { 12825 public void run() { 12826 mPrivateFlags &= ~PREPRESSED; 12827 mPrivateFlags |= PRESSED; 12828 refreshDrawableState(); 12829 checkForLongClick(ViewConfiguration.getTapTimeout()); 12830 } 12831 } 12832 12833 private final class PerformClick implements Runnable { 12834 public void run() { 12835 performClick(); 12836 } 12837 } 12838 12839 /** @hide */ 12840 public void hackTurnOffWindowResizeAnim(boolean off) { 12841 mAttachInfo.mTurnOffWindowResizeAnim = off; 12842 } 12843 12844 /** 12845 * This method returns a ViewPropertyAnimator object, which can be used to animate 12846 * specific properties on this View. 12847 * 12848 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 12849 */ 12850 public ViewPropertyAnimator animate() { 12851 if (mAnimator == null) { 12852 mAnimator = new ViewPropertyAnimator(this); 12853 } 12854 return mAnimator; 12855 } 12856 12857 /** 12858 * Interface definition for a callback to be invoked when a key event is 12859 * dispatched to this view. The callback will be invoked before the key 12860 * event is given to the view. 12861 */ 12862 public interface OnKeyListener { 12863 /** 12864 * Called when a key is dispatched to a view. This allows listeners to 12865 * get a chance to respond before the target view. 12866 * 12867 * @param v The view the key has been dispatched to. 12868 * @param keyCode The code for the physical key that was pressed 12869 * @param event The KeyEvent object containing full information about 12870 * the event. 12871 * @return True if the listener has consumed the event, false otherwise. 12872 */ 12873 boolean onKey(View v, int keyCode, KeyEvent event); 12874 } 12875 12876 /** 12877 * Interface definition for a callback to be invoked when a touch event is 12878 * dispatched to this view. The callback will be invoked before the touch 12879 * event is given to the view. 12880 */ 12881 public interface OnTouchListener { 12882 /** 12883 * Called when a touch event is dispatched to a view. This allows listeners to 12884 * get a chance to respond before the target view. 12885 * 12886 * @param v The view the touch event has been dispatched to. 12887 * @param event The MotionEvent object containing full information about 12888 * the event. 12889 * @return True if the listener has consumed the event, false otherwise. 12890 */ 12891 boolean onTouch(View v, MotionEvent event); 12892 } 12893 12894 /** 12895 * Interface definition for a callback to be invoked when a generic motion event is 12896 * dispatched to this view. The callback will be invoked before the generic motion 12897 * event is given to the view. 12898 */ 12899 public interface OnGenericMotionListener { 12900 /** 12901 * Called when a generic motion event is dispatched to a view. This allows listeners to 12902 * get a chance to respond before the target view. 12903 * 12904 * @param v The view the generic motion event has been dispatched to. 12905 * @param event The MotionEvent object containing full information about 12906 * the event. 12907 * @return True if the listener has consumed the event, false otherwise. 12908 */ 12909 boolean onGenericMotion(View v, MotionEvent event); 12910 } 12911 12912 /** 12913 * Interface definition for a callback to be invoked when a view has been clicked and held. 12914 */ 12915 public interface OnLongClickListener { 12916 /** 12917 * Called when a view has been clicked and held. 12918 * 12919 * @param v The view that was clicked and held. 12920 * 12921 * @return true if the callback consumed the long click, false otherwise. 12922 */ 12923 boolean onLongClick(View v); 12924 } 12925 12926 /** 12927 * Interface definition for a callback to be invoked when a drag is being dispatched 12928 * to this view. The callback will be invoked before the hosting view's own 12929 * onDrag(event) method. If the listener wants to fall back to the hosting view's 12930 * onDrag(event) behavior, it should return 'false' from this callback. 12931 */ 12932 public interface OnDragListener { 12933 /** 12934 * Called when a drag event is dispatched to a view. This allows listeners 12935 * to get a chance to override base View behavior. 12936 * 12937 * @param v The View that received the drag event. 12938 * @param event The {@link android.view.DragEvent} object for the drag event. 12939 * @return {@code true} if the drag event was handled successfully, or {@code false} 12940 * if the drag event was not handled. Note that {@code false} will trigger the View 12941 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 12942 */ 12943 boolean onDrag(View v, DragEvent event); 12944 } 12945 12946 /** 12947 * Interface definition for a callback to be invoked when the focus state of 12948 * a view changed. 12949 */ 12950 public interface OnFocusChangeListener { 12951 /** 12952 * Called when the focus state of a view has changed. 12953 * 12954 * @param v The view whose state has changed. 12955 * @param hasFocus The new focus state of v. 12956 */ 12957 void onFocusChange(View v, boolean hasFocus); 12958 } 12959 12960 /** 12961 * Interface definition for a callback to be invoked when a view is clicked. 12962 */ 12963 public interface OnClickListener { 12964 /** 12965 * Called when a view has been clicked. 12966 * 12967 * @param v The view that was clicked. 12968 */ 12969 void onClick(View v); 12970 } 12971 12972 /** 12973 * Interface definition for a callback to be invoked when the context menu 12974 * for this view is being built. 12975 */ 12976 public interface OnCreateContextMenuListener { 12977 /** 12978 * Called when the context menu for this view is being built. It is not 12979 * safe to hold onto the menu after this method returns. 12980 * 12981 * @param menu The context menu that is being built 12982 * @param v The view for which the context menu is being built 12983 * @param menuInfo Extra information about the item for which the 12984 * context menu should be shown. This information will vary 12985 * depending on the class of v. 12986 */ 12987 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 12988 } 12989 12990 /** 12991 * Interface definition for a callback to be invoked when the status bar changes 12992 * visibility. 12993 * 12994 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 12995 */ 12996 public interface OnSystemUiVisibilityChangeListener { 12997 /** 12998 * Called when the status bar changes visibility because of a call to 12999 * {@link View#setSystemUiVisibility(int)}. 13000 * 13001 * @param visibility {@link #STATUS_BAR_VISIBLE} or {@link #STATUS_BAR_HIDDEN}. 13002 */ 13003 public void onSystemUiVisibilityChange(int visibility); 13004 } 13005 13006 /** 13007 * Interface definition for a callback to be invoked when this view is attached 13008 * or detached from its window. 13009 */ 13010 public interface OnAttachStateChangeListener { 13011 /** 13012 * Called when the view is attached to a window. 13013 * @param v The view that was attached 13014 */ 13015 public void onViewAttachedToWindow(View v); 13016 /** 13017 * Called when the view is detached from a window. 13018 * @param v The view that was detached 13019 */ 13020 public void onViewDetachedFromWindow(View v); 13021 } 13022 13023 private final class UnsetPressedState implements Runnable { 13024 public void run() { 13025 setPressed(false); 13026 } 13027 } 13028 13029 /** 13030 * Base class for derived classes that want to save and restore their own 13031 * state in {@link android.view.View#onSaveInstanceState()}. 13032 */ 13033 public static class BaseSavedState extends AbsSavedState { 13034 /** 13035 * Constructor used when reading from a parcel. Reads the state of the superclass. 13036 * 13037 * @param source 13038 */ 13039 public BaseSavedState(Parcel source) { 13040 super(source); 13041 } 13042 13043 /** 13044 * Constructor called by derived classes when creating their SavedState objects 13045 * 13046 * @param superState The state of the superclass of this view 13047 */ 13048 public BaseSavedState(Parcelable superState) { 13049 super(superState); 13050 } 13051 13052 public static final Parcelable.Creator<BaseSavedState> CREATOR = 13053 new Parcelable.Creator<BaseSavedState>() { 13054 public BaseSavedState createFromParcel(Parcel in) { 13055 return new BaseSavedState(in); 13056 } 13057 13058 public BaseSavedState[] newArray(int size) { 13059 return new BaseSavedState[size]; 13060 } 13061 }; 13062 } 13063 13064 /** 13065 * A set of information given to a view when it is attached to its parent 13066 * window. 13067 */ 13068 static class AttachInfo { 13069 interface Callbacks { 13070 void playSoundEffect(int effectId); 13071 boolean performHapticFeedback(int effectId, boolean always); 13072 } 13073 13074 /** 13075 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 13076 * to a Handler. This class contains the target (View) to invalidate and 13077 * the coordinates of the dirty rectangle. 13078 * 13079 * For performance purposes, this class also implements a pool of up to 13080 * POOL_LIMIT objects that get reused. This reduces memory allocations 13081 * whenever possible. 13082 */ 13083 static class InvalidateInfo implements Poolable<InvalidateInfo> { 13084 private static final int POOL_LIMIT = 10; 13085 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 13086 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 13087 public InvalidateInfo newInstance() { 13088 return new InvalidateInfo(); 13089 } 13090 13091 public void onAcquired(InvalidateInfo element) { 13092 } 13093 13094 public void onReleased(InvalidateInfo element) { 13095 } 13096 }, POOL_LIMIT) 13097 ); 13098 13099 private InvalidateInfo mNext; 13100 private boolean mIsPooled; 13101 13102 View target; 13103 13104 int left; 13105 int top; 13106 int right; 13107 int bottom; 13108 13109 public void setNextPoolable(InvalidateInfo element) { 13110 mNext = element; 13111 } 13112 13113 public InvalidateInfo getNextPoolable() { 13114 return mNext; 13115 } 13116 13117 static InvalidateInfo acquire() { 13118 return sPool.acquire(); 13119 } 13120 13121 void release() { 13122 sPool.release(this); 13123 } 13124 13125 public boolean isPooled() { 13126 return mIsPooled; 13127 } 13128 13129 public void setPooled(boolean isPooled) { 13130 mIsPooled = isPooled; 13131 } 13132 } 13133 13134 final IWindowSession mSession; 13135 13136 final IWindow mWindow; 13137 13138 final IBinder mWindowToken; 13139 13140 final Callbacks mRootCallbacks; 13141 13142 HardwareCanvas mHardwareCanvas; 13143 13144 /** 13145 * The top view of the hierarchy. 13146 */ 13147 View mRootView; 13148 13149 IBinder mPanelParentWindowToken; 13150 Surface mSurface; 13151 13152 boolean mHardwareAccelerated; 13153 boolean mHardwareAccelerationRequested; 13154 HardwareRenderer mHardwareRenderer; 13155 13156 /** 13157 * Scale factor used by the compatibility mode 13158 */ 13159 float mApplicationScale; 13160 13161 /** 13162 * Indicates whether the application is in compatibility mode 13163 */ 13164 boolean mScalingRequired; 13165 13166 /** 13167 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 13168 */ 13169 boolean mTurnOffWindowResizeAnim; 13170 13171 /** 13172 * Left position of this view's window 13173 */ 13174 int mWindowLeft; 13175 13176 /** 13177 * Top position of this view's window 13178 */ 13179 int mWindowTop; 13180 13181 /** 13182 * Indicates whether views need to use 32-bit drawing caches 13183 */ 13184 boolean mUse32BitDrawingCache; 13185 13186 /** 13187 * For windows that are full-screen but using insets to layout inside 13188 * of the screen decorations, these are the current insets for the 13189 * content of the window. 13190 */ 13191 final Rect mContentInsets = new Rect(); 13192 13193 /** 13194 * For windows that are full-screen but using insets to layout inside 13195 * of the screen decorations, these are the current insets for the 13196 * actual visible parts of the window. 13197 */ 13198 final Rect mVisibleInsets = new Rect(); 13199 13200 /** 13201 * The internal insets given by this window. This value is 13202 * supplied by the client (through 13203 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 13204 * be given to the window manager when changed to be used in laying 13205 * out windows behind it. 13206 */ 13207 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 13208 = new ViewTreeObserver.InternalInsetsInfo(); 13209 13210 /** 13211 * All views in the window's hierarchy that serve as scroll containers, 13212 * used to determine if the window can be resized or must be panned 13213 * to adjust for a soft input area. 13214 */ 13215 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 13216 13217 final KeyEvent.DispatcherState mKeyDispatchState 13218 = new KeyEvent.DispatcherState(); 13219 13220 /** 13221 * Indicates whether the view's window currently has the focus. 13222 */ 13223 boolean mHasWindowFocus; 13224 13225 /** 13226 * The current visibility of the window. 13227 */ 13228 int mWindowVisibility; 13229 13230 /** 13231 * Indicates the time at which drawing started to occur. 13232 */ 13233 long mDrawingTime; 13234 13235 /** 13236 * Indicates whether or not ignoring the DIRTY_MASK flags. 13237 */ 13238 boolean mIgnoreDirtyState; 13239 13240 /** 13241 * Indicates whether the view's window is currently in touch mode. 13242 */ 13243 boolean mInTouchMode; 13244 13245 /** 13246 * Indicates that ViewAncestor should trigger a global layout change 13247 * the next time it performs a traversal 13248 */ 13249 boolean mRecomputeGlobalAttributes; 13250 13251 /** 13252 * Set during a traveral if any views want to keep the screen on. 13253 */ 13254 boolean mKeepScreenOn; 13255 13256 /** 13257 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 13258 */ 13259 int mSystemUiVisibility; 13260 13261 /** 13262 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 13263 * attached. 13264 */ 13265 boolean mHasSystemUiListeners; 13266 13267 /** 13268 * Set if the visibility of any views has changed. 13269 */ 13270 boolean mViewVisibilityChanged; 13271 13272 /** 13273 * Set to true if a view has been scrolled. 13274 */ 13275 boolean mViewScrollChanged; 13276 13277 /** 13278 * Global to the view hierarchy used as a temporary for dealing with 13279 * x/y points in the transparent region computations. 13280 */ 13281 final int[] mTransparentLocation = new int[2]; 13282 13283 /** 13284 * Global to the view hierarchy used as a temporary for dealing with 13285 * x/y points in the ViewGroup.invalidateChild implementation. 13286 */ 13287 final int[] mInvalidateChildLocation = new int[2]; 13288 13289 13290 /** 13291 * Global to the view hierarchy used as a temporary for dealing with 13292 * x/y location when view is transformed. 13293 */ 13294 final float[] mTmpTransformLocation = new float[2]; 13295 13296 /** 13297 * The view tree observer used to dispatch global events like 13298 * layout, pre-draw, touch mode change, etc. 13299 */ 13300 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 13301 13302 /** 13303 * A Canvas used by the view hierarchy to perform bitmap caching. 13304 */ 13305 Canvas mCanvas; 13306 13307 /** 13308 * A Handler supplied by a view's {@link android.view.ViewAncestor}. This 13309 * handler can be used to pump events in the UI events queue. 13310 */ 13311 final Handler mHandler; 13312 13313 /** 13314 * Identifier for messages requesting the view to be invalidated. 13315 * Such messages should be sent to {@link #mHandler}. 13316 */ 13317 static final int INVALIDATE_MSG = 0x1; 13318 13319 /** 13320 * Identifier for messages requesting the view to invalidate a region. 13321 * Such messages should be sent to {@link #mHandler}. 13322 */ 13323 static final int INVALIDATE_RECT_MSG = 0x2; 13324 13325 /** 13326 * Temporary for use in computing invalidate rectangles while 13327 * calling up the hierarchy. 13328 */ 13329 final Rect mTmpInvalRect = new Rect(); 13330 13331 /** 13332 * Temporary for use in computing hit areas with transformed views 13333 */ 13334 final RectF mTmpTransformRect = new RectF(); 13335 13336 /** 13337 * Temporary list for use in collecting focusable descendents of a view. 13338 */ 13339 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 13340 13341 /** 13342 * The id of the window for accessibility purposes. 13343 */ 13344 int mAccessibilityWindowId = View.NO_ID; 13345 13346 /** 13347 * Creates a new set of attachment information with the specified 13348 * events handler and thread. 13349 * 13350 * @param handler the events handler the view must use 13351 */ 13352 AttachInfo(IWindowSession session, IWindow window, 13353 Handler handler, Callbacks effectPlayer) { 13354 mSession = session; 13355 mWindow = window; 13356 mWindowToken = window.asBinder(); 13357 mHandler = handler; 13358 mRootCallbacks = effectPlayer; 13359 } 13360 } 13361 13362 /** 13363 * <p>ScrollabilityCache holds various fields used by a View when scrolling 13364 * is supported. This avoids keeping too many unused fields in most 13365 * instances of View.</p> 13366 */ 13367 private static class ScrollabilityCache implements Runnable { 13368 13369 /** 13370 * Scrollbars are not visible 13371 */ 13372 public static final int OFF = 0; 13373 13374 /** 13375 * Scrollbars are visible 13376 */ 13377 public static final int ON = 1; 13378 13379 /** 13380 * Scrollbars are fading away 13381 */ 13382 public static final int FADING = 2; 13383 13384 public boolean fadeScrollBars; 13385 13386 public int fadingEdgeLength; 13387 public int scrollBarDefaultDelayBeforeFade; 13388 public int scrollBarFadeDuration; 13389 13390 public int scrollBarSize; 13391 public ScrollBarDrawable scrollBar; 13392 public float[] interpolatorValues; 13393 public View host; 13394 13395 public final Paint paint; 13396 public final Matrix matrix; 13397 public Shader shader; 13398 13399 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 13400 13401 private static final float[] OPAQUE = { 255 }; 13402 private static final float[] TRANSPARENT = { 0.0f }; 13403 13404 /** 13405 * When fading should start. This time moves into the future every time 13406 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 13407 */ 13408 public long fadeStartTime; 13409 13410 13411 /** 13412 * The current state of the scrollbars: ON, OFF, or FADING 13413 */ 13414 public int state = OFF; 13415 13416 private int mLastColor; 13417 13418 public ScrollabilityCache(ViewConfiguration configuration, View host) { 13419 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 13420 scrollBarSize = configuration.getScaledScrollBarSize(); 13421 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 13422 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 13423 13424 paint = new Paint(); 13425 matrix = new Matrix(); 13426 // use use a height of 1, and then wack the matrix each time we 13427 // actually use it. 13428 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 13429 13430 paint.setShader(shader); 13431 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 13432 this.host = host; 13433 } 13434 13435 public void setFadeColor(int color) { 13436 if (color != 0 && color != mLastColor) { 13437 mLastColor = color; 13438 color |= 0xFF000000; 13439 13440 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 13441 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 13442 13443 paint.setShader(shader); 13444 // Restore the default transfer mode (src_over) 13445 paint.setXfermode(null); 13446 } 13447 } 13448 13449 public void run() { 13450 long now = AnimationUtils.currentAnimationTimeMillis(); 13451 if (now >= fadeStartTime) { 13452 13453 // the animation fades the scrollbars out by changing 13454 // the opacity (alpha) from fully opaque to fully 13455 // transparent 13456 int nextFrame = (int) now; 13457 int framesCount = 0; 13458 13459 Interpolator interpolator = scrollBarInterpolator; 13460 13461 // Start opaque 13462 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 13463 13464 // End transparent 13465 nextFrame += scrollBarFadeDuration; 13466 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 13467 13468 state = FADING; 13469 13470 // Kick off the fade animation 13471 host.invalidate(true); 13472 } 13473 } 13474 13475 } 13476} 13477