View.java revision f1ae10640fe152b56465e7e7184731226f95b0dd
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import com.android.internal.R; 20import com.android.internal.util.Predicate; 21import com.android.internal.view.menu.MenuBuilder; 22 23import android.content.ClipData; 24import android.content.Context; 25import android.content.res.Configuration; 26import android.content.res.Resources; 27import android.content.res.TypedArray; 28import android.graphics.Bitmap; 29import android.graphics.Camera; 30import android.graphics.Canvas; 31import android.graphics.Interpolator; 32import android.graphics.LinearGradient; 33import android.graphics.Matrix; 34import android.graphics.Paint; 35import android.graphics.PixelFormat; 36import android.graphics.Point; 37import android.graphics.PorterDuff; 38import android.graphics.PorterDuffXfermode; 39import android.graphics.Rect; 40import android.graphics.RectF; 41import android.graphics.Region; 42import android.graphics.Shader; 43import android.graphics.drawable.ColorDrawable; 44import android.graphics.drawable.Drawable; 45import android.os.Handler; 46import android.os.IBinder; 47import android.os.Message; 48import android.os.Parcel; 49import android.os.Parcelable; 50import android.os.RemoteException; 51import android.os.SystemClock; 52import android.os.SystemProperties; 53import android.util.AttributeSet; 54import android.util.Log; 55import android.util.Pool; 56import android.util.Poolable; 57import android.util.PoolableManager; 58import android.util.Pools; 59import android.util.SparseArray; 60import android.util.TypedValue; 61import android.view.ContextMenu.ContextMenuInfo; 62import android.view.View.MeasureSpec; 63import android.view.accessibility.AccessibilityEvent; 64import android.view.accessibility.AccessibilityEventSource; 65import android.view.accessibility.AccessibilityManager; 66import android.view.animation.Animation; 67import android.view.animation.AnimationUtils; 68import android.view.inputmethod.EditorInfo; 69import android.view.inputmethod.InputConnection; 70import android.view.inputmethod.InputMethodManager; 71import android.widget.ScrollBarDrawable; 72 73import java.lang.ref.WeakReference; 74import java.lang.reflect.InvocationTargetException; 75import java.lang.reflect.Method; 76import java.util.ArrayList; 77import java.util.Arrays; 78import java.util.WeakHashMap; 79import java.util.concurrent.CopyOnWriteArrayList; 80 81/** 82 * <p> 83 * This class represents the basic building block for user interface components. A View 84 * occupies a rectangular area on the screen and is responsible for drawing and 85 * event handling. View is the base class for <em>widgets</em>, which are 86 * used to create interactive UI components (buttons, text fields, etc.). The 87 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 88 * are invisible containers that hold other Views (or other ViewGroups) and define 89 * their layout properties. 90 * </p> 91 * 92 * <div class="special"> 93 * <p>For an introduction to using this class to develop your 94 * application's user interface, read the Developer Guide documentation on 95 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 96 * include: 97 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 103 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 104 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 105 * </p> 106 * </div> 107 * 108 * <a name="Using"></a> 109 * <h3>Using Views</h3> 110 * <p> 111 * All of the views in a window are arranged in a single tree. You can add views 112 * either from code or by specifying a tree of views in one or more XML layout 113 * files. There are many specialized subclasses of views that act as controls or 114 * are capable of displaying text, images, or other content. 115 * </p> 116 * <p> 117 * Once you have created a tree of views, there are typically a few types of 118 * common operations you may wish to perform: 119 * <ul> 120 * <li><strong>Set properties:</strong> for example setting the text of a 121 * {@link android.widget.TextView}. The available properties and the methods 122 * that set them will vary among the different subclasses of views. Note that 123 * properties that are known at build time can be set in the XML layout 124 * files.</li> 125 * <li><strong>Set focus:</strong> The framework will handled moving focus in 126 * response to user input. To force focus to a specific view, call 127 * {@link #requestFocus}.</li> 128 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 129 * that will be notified when something interesting happens to the view. For 130 * example, all views will let you set a listener to be notified when the view 131 * gains or loses focus. You can register such a listener using 132 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 133 * specialized listeners. For example, a Button exposes a listener to notify 134 * clients when the button is clicked.</li> 135 * <li><strong>Set visibility:</strong> You can hide or show views using 136 * {@link #setVisibility}.</li> 137 * </ul> 138 * </p> 139 * <p><em> 140 * Note: The Android framework is responsible for measuring, laying out and 141 * drawing views. You should not call methods that perform these actions on 142 * views yourself unless you are actually implementing a 143 * {@link android.view.ViewGroup}. 144 * </em></p> 145 * 146 * <a name="Lifecycle"></a> 147 * <h3>Implementing a Custom View</h3> 148 * 149 * <p> 150 * To implement a custom view, you will usually begin by providing overrides for 151 * some of the standard methods that the framework calls on all views. You do 152 * not need to override all of these methods. In fact, you can start by just 153 * overriding {@link #onDraw(android.graphics.Canvas)}. 154 * <table border="2" width="85%" align="center" cellpadding="5"> 155 * <thead> 156 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 157 * </thead> 158 * 159 * <tbody> 160 * <tr> 161 * <td rowspan="2">Creation</td> 162 * <td>Constructors</td> 163 * <td>There is a form of the constructor that are called when the view 164 * is created from code and a form that is called when the view is 165 * inflated from a layout file. The second form should parse and apply 166 * any attributes defined in the layout file. 167 * </td> 168 * </tr> 169 * <tr> 170 * <td><code>{@link #onFinishInflate()}</code></td> 171 * <td>Called after a view and all of its children has been inflated 172 * from XML.</td> 173 * </tr> 174 * 175 * <tr> 176 * <td rowspan="3">Layout</td> 177 * <td><code>{@link #onMeasure}</code></td> 178 * <td>Called to determine the size requirements for this view and all 179 * of its children. 180 * </td> 181 * </tr> 182 * <tr> 183 * <td><code>{@link #onLayout}</code></td> 184 * <td>Called when this view should assign a size and position to all 185 * of its children. 186 * </td> 187 * </tr> 188 * <tr> 189 * <td><code>{@link #onSizeChanged}</code></td> 190 * <td>Called when the size of this view has changed. 191 * </td> 192 * </tr> 193 * 194 * <tr> 195 * <td>Drawing</td> 196 * <td><code>{@link #onDraw}</code></td> 197 * <td>Called when the view should render its content. 198 * </td> 199 * </tr> 200 * 201 * <tr> 202 * <td rowspan="4">Event processing</td> 203 * <td><code>{@link #onKeyDown}</code></td> 204 * <td>Called when a new key event occurs. 205 * </td> 206 * </tr> 207 * <tr> 208 * <td><code>{@link #onKeyUp}</code></td> 209 * <td>Called when a key up event occurs. 210 * </td> 211 * </tr> 212 * <tr> 213 * <td><code>{@link #onTrackballEvent}</code></td> 214 * <td>Called when a trackball motion event occurs. 215 * </td> 216 * </tr> 217 * <tr> 218 * <td><code>{@link #onTouchEvent}</code></td> 219 * <td>Called when a touch screen motion event occurs. 220 * </td> 221 * </tr> 222 * 223 * <tr> 224 * <td rowspan="2">Focus</td> 225 * <td><code>{@link #onFocusChanged}</code></td> 226 * <td>Called when the view gains or loses focus. 227 * </td> 228 * </tr> 229 * 230 * <tr> 231 * <td><code>{@link #onWindowFocusChanged}</code></td> 232 * <td>Called when the window containing the view gains or loses focus. 233 * </td> 234 * </tr> 235 * 236 * <tr> 237 * <td rowspan="3">Attaching</td> 238 * <td><code>{@link #onAttachedToWindow()}</code></td> 239 * <td>Called when the view is attached to a window. 240 * </td> 241 * </tr> 242 * 243 * <tr> 244 * <td><code>{@link #onDetachedFromWindow}</code></td> 245 * <td>Called when the view is detached from its window. 246 * </td> 247 * </tr> 248 * 249 * <tr> 250 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 251 * <td>Called when the visibility of the window containing the view 252 * has changed. 253 * </td> 254 * </tr> 255 * </tbody> 256 * 257 * </table> 258 * </p> 259 * 260 * <a name="IDs"></a> 261 * <h3>IDs</h3> 262 * Views may have an integer id associated with them. These ids are typically 263 * assigned in the layout XML files, and are used to find specific views within 264 * the view tree. A common pattern is to: 265 * <ul> 266 * <li>Define a Button in the layout file and assign it a unique ID. 267 * <pre> 268 * <Button 269 * android:id="@+id/my_button" 270 * android:layout_width="wrap_content" 271 * android:layout_height="wrap_content" 272 * android:text="@string/my_button_text"/> 273 * </pre></li> 274 * <li>From the onCreate method of an Activity, find the Button 275 * <pre class="prettyprint"> 276 * Button myButton = (Button) findViewById(R.id.my_button); 277 * </pre></li> 278 * </ul> 279 * <p> 280 * View IDs need not be unique throughout the tree, but it is good practice to 281 * ensure that they are at least unique within the part of the tree you are 282 * searching. 283 * </p> 284 * 285 * <a name="Position"></a> 286 * <h3>Position</h3> 287 * <p> 288 * The geometry of a view is that of a rectangle. A view has a location, 289 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 290 * two dimensions, expressed as a width and a height. The unit for location 291 * and dimensions is the pixel. 292 * </p> 293 * 294 * <p> 295 * It is possible to retrieve the location of a view by invoking the methods 296 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 297 * coordinate of the rectangle representing the view. The latter returns the 298 * top, or Y, coordinate of the rectangle representing the view. These methods 299 * both return the location of the view relative to its parent. For instance, 300 * when getLeft() returns 20, that means the view is located 20 pixels to the 301 * right of the left edge of its direct parent. 302 * </p> 303 * 304 * <p> 305 * In addition, several convenience methods are offered to avoid unnecessary 306 * computations, namely {@link #getRight()} and {@link #getBottom()}. 307 * These methods return the coordinates of the right and bottom edges of the 308 * rectangle representing the view. For instance, calling {@link #getRight()} 309 * is similar to the following computation: <code>getLeft() + getWidth()</code> 310 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 311 * </p> 312 * 313 * <a name="SizePaddingMargins"></a> 314 * <h3>Size, padding and margins</h3> 315 * <p> 316 * The size of a view is expressed with a width and a height. A view actually 317 * possess two pairs of width and height values. 318 * </p> 319 * 320 * <p> 321 * The first pair is known as <em>measured width</em> and 322 * <em>measured height</em>. These dimensions define how big a view wants to be 323 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 324 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 325 * and {@link #getMeasuredHeight()}. 326 * </p> 327 * 328 * <p> 329 * The second pair is simply known as <em>width</em> and <em>height</em>, or 330 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 331 * dimensions define the actual size of the view on screen, at drawing time and 332 * after layout. These values may, but do not have to, be different from the 333 * measured width and height. The width and height can be obtained by calling 334 * {@link #getWidth()} and {@link #getHeight()}. 335 * </p> 336 * 337 * <p> 338 * To measure its dimensions, a view takes into account its padding. The padding 339 * is expressed in pixels for the left, top, right and bottom parts of the view. 340 * Padding can be used to offset the content of the view by a specific amount of 341 * pixels. For instance, a left padding of 2 will push the view's content by 342 * 2 pixels to the right of the left edge. Padding can be set using the 343 * {@link #setPadding(int, int, int, int)} method and queried by calling 344 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 345 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 346 * </p> 347 * 348 * <p> 349 * Even though a view can define a padding, it does not provide any support for 350 * margins. However, view groups provide such a support. Refer to 351 * {@link android.view.ViewGroup} and 352 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 353 * </p> 354 * 355 * <a name="Layout"></a> 356 * <h3>Layout</h3> 357 * <p> 358 * Layout is a two pass process: a measure pass and a layout pass. The measuring 359 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 360 * of the view tree. Each view pushes dimension specifications down the tree 361 * during the recursion. At the end of the measure pass, every view has stored 362 * its measurements. The second pass happens in 363 * {@link #layout(int,int,int,int)} and is also top-down. During 364 * this pass each parent is responsible for positioning all of its children 365 * using the sizes computed in the measure pass. 366 * </p> 367 * 368 * <p> 369 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 370 * {@link #getMeasuredHeight()} values must be set, along with those for all of 371 * that view's descendants. A view's measured width and measured height values 372 * must respect the constraints imposed by the view's parents. This guarantees 373 * that at the end of the measure pass, all parents accept all of their 374 * children's measurements. A parent view may call measure() more than once on 375 * its children. For example, the parent may measure each child once with 376 * unspecified dimensions to find out how big they want to be, then call 377 * measure() on them again with actual numbers if the sum of all the children's 378 * unconstrained sizes is too big or too small. 379 * </p> 380 * 381 * <p> 382 * The measure pass uses two classes to communicate dimensions. The 383 * {@link MeasureSpec} class is used by views to tell their parents how they 384 * want to be measured and positioned. The base LayoutParams class just 385 * describes how big the view wants to be for both width and height. For each 386 * dimension, it can specify one of: 387 * <ul> 388 * <li> an exact number 389 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 390 * (minus padding) 391 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 392 * enclose its content (plus padding). 393 * </ul> 394 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 395 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 396 * an X and Y value. 397 * </p> 398 * 399 * <p> 400 * MeasureSpecs are used to push requirements down the tree from parent to 401 * child. A MeasureSpec can be in one of three modes: 402 * <ul> 403 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 404 * of a child view. For example, a LinearLayout may call measure() on its child 405 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 406 * tall the child view wants to be given a width of 240 pixels. 407 * <li>EXACTLY: This is used by the parent to impose an exact size on the 408 * child. The child must use this size, and guarantee that all of its 409 * descendants will fit within this size. 410 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 411 * child. The child must gurantee that it and all of its descendants will fit 412 * within this size. 413 * </ul> 414 * </p> 415 * 416 * <p> 417 * To intiate a layout, call {@link #requestLayout}. This method is typically 418 * called by a view on itself when it believes that is can no longer fit within 419 * its current bounds. 420 * </p> 421 * 422 * <a name="Drawing"></a> 423 * <h3>Drawing</h3> 424 * <p> 425 * Drawing is handled by walking the tree and rendering each view that 426 * intersects the the invalid region. Because the tree is traversed in-order, 427 * this means that parents will draw before (i.e., behind) their children, with 428 * siblings drawn in the order they appear in the tree. 429 * If you set a background drawable for a View, then the View will draw it for you 430 * before calling back to its <code>onDraw()</code> method. 431 * </p> 432 * 433 * <p> 434 * Note that the framework will not draw views that are not in the invalid region. 435 * </p> 436 * 437 * <p> 438 * To force a view to draw, call {@link #invalidate()}. 439 * </p> 440 * 441 * <a name="EventHandlingThreading"></a> 442 * <h3>Event Handling and Threading</h3> 443 * <p> 444 * The basic cycle of a view is as follows: 445 * <ol> 446 * <li>An event comes in and is dispatched to the appropriate view. The view 447 * handles the event and notifies any listeners.</li> 448 * <li>If in the course of processing the event, the view's bounds may need 449 * to be changed, the view will call {@link #requestLayout()}.</li> 450 * <li>Similarly, if in the course of processing the event the view's appearance 451 * may need to be changed, the view will call {@link #invalidate()}.</li> 452 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 453 * the framework will take care of measuring, laying out, and drawing the tree 454 * as appropriate.</li> 455 * </ol> 456 * </p> 457 * 458 * <p><em>Note: The entire view tree is single threaded. You must always be on 459 * the UI thread when calling any method on any view.</em> 460 * If you are doing work on other threads and want to update the state of a view 461 * from that thread, you should use a {@link Handler}. 462 * </p> 463 * 464 * <a name="FocusHandling"></a> 465 * <h3>Focus Handling</h3> 466 * <p> 467 * The framework will handle routine focus movement in response to user input. 468 * This includes changing the focus as views are removed or hidden, or as new 469 * views become available. Views indicate their willingness to take focus 470 * through the {@link #isFocusable} method. To change whether a view can take 471 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 472 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 473 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 474 * </p> 475 * <p> 476 * Focus movement is based on an algorithm which finds the nearest neighbor in a 477 * given direction. In rare cases, the default algorithm may not match the 478 * intended behavior of the developer. In these situations, you can provide 479 * explicit overrides by using these XML attributes in the layout file: 480 * <pre> 481 * nextFocusDown 482 * nextFocusLeft 483 * nextFocusRight 484 * nextFocusUp 485 * </pre> 486 * </p> 487 * 488 * 489 * <p> 490 * To get a particular view to take focus, call {@link #requestFocus()}. 491 * </p> 492 * 493 * <a name="TouchMode"></a> 494 * <h3>Touch Mode</h3> 495 * <p> 496 * When a user is navigating a user interface via directional keys such as a D-pad, it is 497 * necessary to give focus to actionable items such as buttons so the user can see 498 * what will take input. If the device has touch capabilities, however, and the user 499 * begins interacting with the interface by touching it, it is no longer necessary to 500 * always highlight, or give focus to, a particular view. This motivates a mode 501 * for interaction named 'touch mode'. 502 * </p> 503 * <p> 504 * For a touch capable device, once the user touches the screen, the device 505 * will enter touch mode. From this point onward, only views for which 506 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 507 * Other views that are touchable, like buttons, will not take focus when touched; they will 508 * only fire the on click listeners. 509 * </p> 510 * <p> 511 * Any time a user hits a directional key, such as a D-pad direction, the view device will 512 * exit touch mode, and find a view to take focus, so that the user may resume interacting 513 * with the user interface without touching the screen again. 514 * </p> 515 * <p> 516 * The touch mode state is maintained across {@link android.app.Activity}s. Call 517 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 518 * </p> 519 * 520 * <a name="Scrolling"></a> 521 * <h3>Scrolling</h3> 522 * <p> 523 * The framework provides basic support for views that wish to internally 524 * scroll their content. This includes keeping track of the X and Y scroll 525 * offset as well as mechanisms for drawing scrollbars. See 526 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 527 * {@link #awakenScrollBars()} for more details. 528 * </p> 529 * 530 * <a name="Tags"></a> 531 * <h3>Tags</h3> 532 * <p> 533 * Unlike IDs, tags are not used to identify views. Tags are essentially an 534 * extra piece of information that can be associated with a view. They are most 535 * often used as a convenience to store data related to views in the views 536 * themselves rather than by putting them in a separate structure. 537 * </p> 538 * 539 * <a name="Animation"></a> 540 * <h3>Animation</h3> 541 * <p> 542 * You can attach an {@link Animation} object to a view using 543 * {@link #setAnimation(Animation)} or 544 * {@link #startAnimation(Animation)}. The animation can alter the scale, 545 * rotation, translation and alpha of a view over time. If the animation is 546 * attached to a view that has children, the animation will affect the entire 547 * subtree rooted by that node. When an animation is started, the framework will 548 * take care of redrawing the appropriate views until the animation completes. 549 * </p> 550 * <p> 551 * Starting with Android 3.0, the preferred way of animating views is to use the 552 * {@link android.animation} package APIs. 553 * </p> 554 * 555 * <a name="Security"></a> 556 * <h3>Security</h3> 557 * <p> 558 * Sometimes it is essential that an application be able to verify that an action 559 * is being performed with the full knowledge and consent of the user, such as 560 * granting a permission request, making a purchase or clicking on an advertisement. 561 * Unfortunately, a malicious application could try to spoof the user into 562 * performing these actions, unaware, by concealing the intended purpose of the view. 563 * As a remedy, the framework offers a touch filtering mechanism that can be used to 564 * improve the security of views that provide access to sensitive functionality. 565 * </p><p> 566 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured} or set the 567 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 568 * will discard touches that are received whenever the view's window is obscured by 569 * another visible window. As a result, the view will not receive touches whenever a 570 * toast, dialog or other window appears above the view's window. 571 * </p><p> 572 * For more fine-grained control over security, consider overriding the 573 * {@link #onFilterTouchEventForSecurity} method to implement your own security policy. 574 * See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 575 * </p> 576 * 577 * @attr ref android.R.styleable#View_alpha 578 * @attr ref android.R.styleable#View_background 579 * @attr ref android.R.styleable#View_clickable 580 * @attr ref android.R.styleable#View_contentDescription 581 * @attr ref android.R.styleable#View_drawingCacheQuality 582 * @attr ref android.R.styleable#View_duplicateParentState 583 * @attr ref android.R.styleable#View_id 584 * @attr ref android.R.styleable#View_fadingEdge 585 * @attr ref android.R.styleable#View_fadingEdgeLength 586 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 587 * @attr ref android.R.styleable#View_fitsSystemWindows 588 * @attr ref android.R.styleable#View_isScrollContainer 589 * @attr ref android.R.styleable#View_focusable 590 * @attr ref android.R.styleable#View_focusableInTouchMode 591 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 592 * @attr ref android.R.styleable#View_keepScreenOn 593 * @attr ref android.R.styleable#View_layerType 594 * @attr ref android.R.styleable#View_longClickable 595 * @attr ref android.R.styleable#View_minHeight 596 * @attr ref android.R.styleable#View_minWidth 597 * @attr ref android.R.styleable#View_nextFocusDown 598 * @attr ref android.R.styleable#View_nextFocusLeft 599 * @attr ref android.R.styleable#View_nextFocusRight 600 * @attr ref android.R.styleable#View_nextFocusUp 601 * @attr ref android.R.styleable#View_onClick 602 * @attr ref android.R.styleable#View_padding 603 * @attr ref android.R.styleable#View_paddingBottom 604 * @attr ref android.R.styleable#View_paddingLeft 605 * @attr ref android.R.styleable#View_paddingRight 606 * @attr ref android.R.styleable#View_paddingTop 607 * @attr ref android.R.styleable#View_saveEnabled 608 * @attr ref android.R.styleable#View_rotation 609 * @attr ref android.R.styleable#View_rotationX 610 * @attr ref android.R.styleable#View_rotationY 611 * @attr ref android.R.styleable#View_scaleX 612 * @attr ref android.R.styleable#View_scaleY 613 * @attr ref android.R.styleable#View_scrollX 614 * @attr ref android.R.styleable#View_scrollY 615 * @attr ref android.R.styleable#View_scrollbarSize 616 * @attr ref android.R.styleable#View_scrollbarStyle 617 * @attr ref android.R.styleable#View_scrollbars 618 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 619 * @attr ref android.R.styleable#View_scrollbarFadeDuration 620 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 621 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 622 * @attr ref android.R.styleable#View_scrollbarThumbVertical 623 * @attr ref android.R.styleable#View_scrollbarTrackVertical 624 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 625 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 626 * @attr ref android.R.styleable#View_soundEffectsEnabled 627 * @attr ref android.R.styleable#View_tag 628 * @attr ref android.R.styleable#View_transformPivotX 629 * @attr ref android.R.styleable#View_transformPivotY 630 * @attr ref android.R.styleable#View_translationX 631 * @attr ref android.R.styleable#View_translationY 632 * @attr ref android.R.styleable#View_visibility 633 * 634 * @see android.view.ViewGroup 635 */ 636public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 637 private static final boolean DBG = false; 638 639 /** 640 * The logging tag used by this class with android.util.Log. 641 */ 642 protected static final String VIEW_LOG_TAG = "View"; 643 644 /** 645 * Used to mark a View that has no ID. 646 */ 647 public static final int NO_ID = -1; 648 649 /** 650 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 651 * calling setFlags. 652 */ 653 private static final int NOT_FOCUSABLE = 0x00000000; 654 655 /** 656 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 657 * setFlags. 658 */ 659 private static final int FOCUSABLE = 0x00000001; 660 661 /** 662 * Mask for use with setFlags indicating bits used for focus. 663 */ 664 private static final int FOCUSABLE_MASK = 0x00000001; 665 666 /** 667 * This view will adjust its padding to fit sytem windows (e.g. status bar) 668 */ 669 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 670 671 /** 672 * This view is visible. Use with {@link #setVisibility}. 673 */ 674 public static final int VISIBLE = 0x00000000; 675 676 /** 677 * This view is invisible, but it still takes up space for layout purposes. 678 * Use with {@link #setVisibility}. 679 */ 680 public static final int INVISIBLE = 0x00000004; 681 682 /** 683 * This view is invisible, and it doesn't take any space for layout 684 * purposes. Use with {@link #setVisibility}. 685 */ 686 public static final int GONE = 0x00000008; 687 688 /** 689 * Mask for use with setFlags indicating bits used for visibility. 690 * {@hide} 691 */ 692 static final int VISIBILITY_MASK = 0x0000000C; 693 694 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 695 696 /** 697 * This view is enabled. Intrepretation varies by subclass. 698 * Use with ENABLED_MASK when calling setFlags. 699 * {@hide} 700 */ 701 static final int ENABLED = 0x00000000; 702 703 /** 704 * This view is disabled. Intrepretation varies by subclass. 705 * Use with ENABLED_MASK when calling setFlags. 706 * {@hide} 707 */ 708 static final int DISABLED = 0x00000020; 709 710 /** 711 * Mask for use with setFlags indicating bits used for indicating whether 712 * this view is enabled 713 * {@hide} 714 */ 715 static final int ENABLED_MASK = 0x00000020; 716 717 /** 718 * This view won't draw. {@link #onDraw} won't be called and further 719 * optimizations 720 * will be performed. It is okay to have this flag set and a background. 721 * Use with DRAW_MASK when calling setFlags. 722 * {@hide} 723 */ 724 static final int WILL_NOT_DRAW = 0x00000080; 725 726 /** 727 * Mask for use with setFlags indicating bits used for indicating whether 728 * this view is will draw 729 * {@hide} 730 */ 731 static final int DRAW_MASK = 0x00000080; 732 733 /** 734 * <p>This view doesn't show scrollbars.</p> 735 * {@hide} 736 */ 737 static final int SCROLLBARS_NONE = 0x00000000; 738 739 /** 740 * <p>This view shows horizontal scrollbars.</p> 741 * {@hide} 742 */ 743 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 744 745 /** 746 * <p>This view shows vertical scrollbars.</p> 747 * {@hide} 748 */ 749 static final int SCROLLBARS_VERTICAL = 0x00000200; 750 751 /** 752 * <p>Mask for use with setFlags indicating bits used for indicating which 753 * scrollbars are enabled.</p> 754 * {@hide} 755 */ 756 static final int SCROLLBARS_MASK = 0x00000300; 757 758 /** 759 * Indicates that the view should filter touches when its window is obscured. 760 * Refer to the class comments for more information about this security feature. 761 * {@hide} 762 */ 763 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 764 765 // note flag value 0x00000800 is now available for next flags... 766 767 /** 768 * <p>This view doesn't show fading edges.</p> 769 * {@hide} 770 */ 771 static final int FADING_EDGE_NONE = 0x00000000; 772 773 /** 774 * <p>This view shows horizontal fading edges.</p> 775 * {@hide} 776 */ 777 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 778 779 /** 780 * <p>This view shows vertical fading edges.</p> 781 * {@hide} 782 */ 783 static final int FADING_EDGE_VERTICAL = 0x00002000; 784 785 /** 786 * <p>Mask for use with setFlags indicating bits used for indicating which 787 * fading edges are enabled.</p> 788 * {@hide} 789 */ 790 static final int FADING_EDGE_MASK = 0x00003000; 791 792 /** 793 * <p>Indicates this view can be clicked. When clickable, a View reacts 794 * to clicks by notifying the OnClickListener.<p> 795 * {@hide} 796 */ 797 static final int CLICKABLE = 0x00004000; 798 799 /** 800 * <p>Indicates this view is caching its drawing into a bitmap.</p> 801 * {@hide} 802 */ 803 static final int DRAWING_CACHE_ENABLED = 0x00008000; 804 805 /** 806 * <p>Indicates that no icicle should be saved for this view.<p> 807 * {@hide} 808 */ 809 static final int SAVE_DISABLED = 0x000010000; 810 811 /** 812 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 813 * property.</p> 814 * {@hide} 815 */ 816 static final int SAVE_DISABLED_MASK = 0x000010000; 817 818 /** 819 * <p>Indicates that no drawing cache should ever be created for this view.<p> 820 * {@hide} 821 */ 822 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 823 824 /** 825 * <p>Indicates this view can take / keep focus when int touch mode.</p> 826 * {@hide} 827 */ 828 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 829 830 /** 831 * <p>Enables low quality mode for the drawing cache.</p> 832 */ 833 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 834 835 /** 836 * <p>Enables high quality mode for the drawing cache.</p> 837 */ 838 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 839 840 /** 841 * <p>Enables automatic quality mode for the drawing cache.</p> 842 */ 843 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 844 845 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 846 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 847 }; 848 849 /** 850 * <p>Mask for use with setFlags indicating bits used for the cache 851 * quality property.</p> 852 * {@hide} 853 */ 854 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 855 856 /** 857 * <p> 858 * Indicates this view can be long clicked. When long clickable, a View 859 * reacts to long clicks by notifying the OnLongClickListener or showing a 860 * context menu. 861 * </p> 862 * {@hide} 863 */ 864 static final int LONG_CLICKABLE = 0x00200000; 865 866 /** 867 * <p>Indicates that this view gets its drawable states from its direct parent 868 * and ignores its original internal states.</p> 869 * 870 * @hide 871 */ 872 static final int DUPLICATE_PARENT_STATE = 0x00400000; 873 874 /** 875 * The scrollbar style to display the scrollbars inside the content area, 876 * without increasing the padding. The scrollbars will be overlaid with 877 * translucency on the view's content. 878 */ 879 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 880 881 /** 882 * The scrollbar style to display the scrollbars inside the padded area, 883 * increasing the padding of the view. The scrollbars will not overlap the 884 * content area of the view. 885 */ 886 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 887 888 /** 889 * The scrollbar style to display the scrollbars at the edge of the view, 890 * without increasing the padding. The scrollbars will be overlaid with 891 * translucency. 892 */ 893 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 894 895 /** 896 * The scrollbar style to display the scrollbars at the edge of the view, 897 * increasing the padding of the view. The scrollbars will only overlap the 898 * background, if any. 899 */ 900 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 901 902 /** 903 * Mask to check if the scrollbar style is overlay or inset. 904 * {@hide} 905 */ 906 static final int SCROLLBARS_INSET_MASK = 0x01000000; 907 908 /** 909 * Mask to check if the scrollbar style is inside or outside. 910 * {@hide} 911 */ 912 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 913 914 /** 915 * Mask for scrollbar style. 916 * {@hide} 917 */ 918 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 919 920 /** 921 * View flag indicating that the screen should remain on while the 922 * window containing this view is visible to the user. This effectively 923 * takes care of automatically setting the WindowManager's 924 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 925 */ 926 public static final int KEEP_SCREEN_ON = 0x04000000; 927 928 /** 929 * View flag indicating whether this view should have sound effects enabled 930 * for events such as clicking and touching. 931 */ 932 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 933 934 /** 935 * View flag indicating whether this view should have haptic feedback 936 * enabled for events such as long presses. 937 */ 938 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 939 940 /** 941 * <p>Indicates that the view hierarchy should stop saving state when 942 * it reaches this view. If state saving is initiated immediately at 943 * the view, it will be allowed. 944 * {@hide} 945 */ 946 static final int PARENT_SAVE_DISABLED = 0x20000000; 947 948 /** 949 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 950 * {@hide} 951 */ 952 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 953 954 /** 955 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 956 * should add all focusable Views regardless if they are focusable in touch mode. 957 */ 958 public static final int FOCUSABLES_ALL = 0x00000000; 959 960 /** 961 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 962 * should add only Views focusable in touch mode. 963 */ 964 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 965 966 /** 967 * Use with {@link #focusSearch}. Move focus to the previous selectable 968 * item. 969 */ 970 public static final int FOCUS_BACKWARD = 0x00000001; 971 972 /** 973 * Use with {@link #focusSearch}. Move focus to the next selectable 974 * item. 975 */ 976 public static final int FOCUS_FORWARD = 0x00000002; 977 978 /** 979 * Use with {@link #focusSearch}. Move focus to the left. 980 */ 981 public static final int FOCUS_LEFT = 0x00000011; 982 983 /** 984 * Use with {@link #focusSearch}. Move focus up. 985 */ 986 public static final int FOCUS_UP = 0x00000021; 987 988 /** 989 * Use with {@link #focusSearch}. Move focus to the right. 990 */ 991 public static final int FOCUS_RIGHT = 0x00000042; 992 993 /** 994 * Use with {@link #focusSearch}. Move focus down. 995 */ 996 public static final int FOCUS_DOWN = 0x00000082; 997 998 /** 999 * Bits of {@link #getMeasuredWidthAndState()} and 1000 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1001 */ 1002 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1003 1004 /** 1005 * Bits of {@link #getMeasuredWidthAndState()} and 1006 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1007 */ 1008 public static final int MEASURED_STATE_MASK = 0xff000000; 1009 1010 /** 1011 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1012 * for functions that combine both width and height into a single int, 1013 * such as {@link #getMeasuredState()} and the childState argument of 1014 * {@link #resolveSizeAndState(int, int, int)}. 1015 */ 1016 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1017 1018 /** 1019 * Bit of {@link #getMeasuredWidthAndState()} and 1020 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1021 * is smaller that the space the view would like to have. 1022 */ 1023 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1024 1025 /** 1026 * Base View state sets 1027 */ 1028 // Singles 1029 /** 1030 * Indicates the view has no states set. States are used with 1031 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1032 * view depending on its state. 1033 * 1034 * @see android.graphics.drawable.Drawable 1035 * @see #getDrawableState() 1036 */ 1037 protected static final int[] EMPTY_STATE_SET; 1038 /** 1039 * Indicates the view is enabled. States are used with 1040 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1041 * view depending on its state. 1042 * 1043 * @see android.graphics.drawable.Drawable 1044 * @see #getDrawableState() 1045 */ 1046 protected static final int[] ENABLED_STATE_SET; 1047 /** 1048 * Indicates the view is focused. States are used with 1049 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1050 * view depending on its state. 1051 * 1052 * @see android.graphics.drawable.Drawable 1053 * @see #getDrawableState() 1054 */ 1055 protected static final int[] FOCUSED_STATE_SET; 1056 /** 1057 * Indicates the view is selected. States are used with 1058 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1059 * view depending on its state. 1060 * 1061 * @see android.graphics.drawable.Drawable 1062 * @see #getDrawableState() 1063 */ 1064 protected static final int[] SELECTED_STATE_SET; 1065 /** 1066 * Indicates the view is pressed. States are used with 1067 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1068 * view depending on its state. 1069 * 1070 * @see android.graphics.drawable.Drawable 1071 * @see #getDrawableState() 1072 * @hide 1073 */ 1074 protected static final int[] PRESSED_STATE_SET; 1075 /** 1076 * Indicates the view's window has focus. States are used with 1077 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1078 * view depending on its state. 1079 * 1080 * @see android.graphics.drawable.Drawable 1081 * @see #getDrawableState() 1082 */ 1083 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1084 // Doubles 1085 /** 1086 * Indicates the view is enabled and has the focus. 1087 * 1088 * @see #ENABLED_STATE_SET 1089 * @see #FOCUSED_STATE_SET 1090 */ 1091 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1092 /** 1093 * Indicates the view is enabled and selected. 1094 * 1095 * @see #ENABLED_STATE_SET 1096 * @see #SELECTED_STATE_SET 1097 */ 1098 protected static final int[] ENABLED_SELECTED_STATE_SET; 1099 /** 1100 * Indicates the view is enabled and that its window has focus. 1101 * 1102 * @see #ENABLED_STATE_SET 1103 * @see #WINDOW_FOCUSED_STATE_SET 1104 */ 1105 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1106 /** 1107 * Indicates the view is focused and selected. 1108 * 1109 * @see #FOCUSED_STATE_SET 1110 * @see #SELECTED_STATE_SET 1111 */ 1112 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1113 /** 1114 * Indicates the view has the focus and that its window has the focus. 1115 * 1116 * @see #FOCUSED_STATE_SET 1117 * @see #WINDOW_FOCUSED_STATE_SET 1118 */ 1119 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1120 /** 1121 * Indicates the view is selected and that its window has the focus. 1122 * 1123 * @see #SELECTED_STATE_SET 1124 * @see #WINDOW_FOCUSED_STATE_SET 1125 */ 1126 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1127 // Triples 1128 /** 1129 * Indicates the view is enabled, focused and selected. 1130 * 1131 * @see #ENABLED_STATE_SET 1132 * @see #FOCUSED_STATE_SET 1133 * @see #SELECTED_STATE_SET 1134 */ 1135 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1136 /** 1137 * Indicates the view is enabled, focused and its window has the focus. 1138 * 1139 * @see #ENABLED_STATE_SET 1140 * @see #FOCUSED_STATE_SET 1141 * @see #WINDOW_FOCUSED_STATE_SET 1142 */ 1143 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1144 /** 1145 * Indicates the view is enabled, selected and its window has the focus. 1146 * 1147 * @see #ENABLED_STATE_SET 1148 * @see #SELECTED_STATE_SET 1149 * @see #WINDOW_FOCUSED_STATE_SET 1150 */ 1151 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1152 /** 1153 * Indicates the view is focused, selected and its window has the focus. 1154 * 1155 * @see #FOCUSED_STATE_SET 1156 * @see #SELECTED_STATE_SET 1157 * @see #WINDOW_FOCUSED_STATE_SET 1158 */ 1159 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1160 /** 1161 * Indicates the view is enabled, focused, selected and its window 1162 * has the focus. 1163 * 1164 * @see #ENABLED_STATE_SET 1165 * @see #FOCUSED_STATE_SET 1166 * @see #SELECTED_STATE_SET 1167 * @see #WINDOW_FOCUSED_STATE_SET 1168 */ 1169 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1170 /** 1171 * Indicates the view is pressed and its window has the focus. 1172 * 1173 * @see #PRESSED_STATE_SET 1174 * @see #WINDOW_FOCUSED_STATE_SET 1175 */ 1176 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1177 /** 1178 * Indicates the view is pressed and selected. 1179 * 1180 * @see #PRESSED_STATE_SET 1181 * @see #SELECTED_STATE_SET 1182 */ 1183 protected static final int[] PRESSED_SELECTED_STATE_SET; 1184 /** 1185 * Indicates the view is pressed, selected and its window has the focus. 1186 * 1187 * @see #PRESSED_STATE_SET 1188 * @see #SELECTED_STATE_SET 1189 * @see #WINDOW_FOCUSED_STATE_SET 1190 */ 1191 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1192 /** 1193 * Indicates the view is pressed and focused. 1194 * 1195 * @see #PRESSED_STATE_SET 1196 * @see #FOCUSED_STATE_SET 1197 */ 1198 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1199 /** 1200 * Indicates the view is pressed, focused and its window has the focus. 1201 * 1202 * @see #PRESSED_STATE_SET 1203 * @see #FOCUSED_STATE_SET 1204 * @see #WINDOW_FOCUSED_STATE_SET 1205 */ 1206 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1207 /** 1208 * Indicates the view is pressed, focused and selected. 1209 * 1210 * @see #PRESSED_STATE_SET 1211 * @see #SELECTED_STATE_SET 1212 * @see #FOCUSED_STATE_SET 1213 */ 1214 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1215 /** 1216 * Indicates the view is pressed, focused, selected and its window has the focus. 1217 * 1218 * @see #PRESSED_STATE_SET 1219 * @see #FOCUSED_STATE_SET 1220 * @see #SELECTED_STATE_SET 1221 * @see #WINDOW_FOCUSED_STATE_SET 1222 */ 1223 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1224 /** 1225 * Indicates the view is pressed and enabled. 1226 * 1227 * @see #PRESSED_STATE_SET 1228 * @see #ENABLED_STATE_SET 1229 */ 1230 protected static final int[] PRESSED_ENABLED_STATE_SET; 1231 /** 1232 * Indicates the view is pressed, enabled and its window has the focus. 1233 * 1234 * @see #PRESSED_STATE_SET 1235 * @see #ENABLED_STATE_SET 1236 * @see #WINDOW_FOCUSED_STATE_SET 1237 */ 1238 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1239 /** 1240 * Indicates the view is pressed, enabled and selected. 1241 * 1242 * @see #PRESSED_STATE_SET 1243 * @see #ENABLED_STATE_SET 1244 * @see #SELECTED_STATE_SET 1245 */ 1246 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1247 /** 1248 * Indicates the view is pressed, enabled, selected and its window has the 1249 * focus. 1250 * 1251 * @see #PRESSED_STATE_SET 1252 * @see #ENABLED_STATE_SET 1253 * @see #SELECTED_STATE_SET 1254 * @see #WINDOW_FOCUSED_STATE_SET 1255 */ 1256 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1257 /** 1258 * Indicates the view is pressed, enabled and focused. 1259 * 1260 * @see #PRESSED_STATE_SET 1261 * @see #ENABLED_STATE_SET 1262 * @see #FOCUSED_STATE_SET 1263 */ 1264 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1265 /** 1266 * Indicates the view is pressed, enabled, focused and its window has the 1267 * focus. 1268 * 1269 * @see #PRESSED_STATE_SET 1270 * @see #ENABLED_STATE_SET 1271 * @see #FOCUSED_STATE_SET 1272 * @see #WINDOW_FOCUSED_STATE_SET 1273 */ 1274 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1275 /** 1276 * Indicates the view is pressed, enabled, focused and selected. 1277 * 1278 * @see #PRESSED_STATE_SET 1279 * @see #ENABLED_STATE_SET 1280 * @see #SELECTED_STATE_SET 1281 * @see #FOCUSED_STATE_SET 1282 */ 1283 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1284 /** 1285 * Indicates the view is pressed, enabled, focused, selected and its window 1286 * has the focus. 1287 * 1288 * @see #PRESSED_STATE_SET 1289 * @see #ENABLED_STATE_SET 1290 * @see #SELECTED_STATE_SET 1291 * @see #FOCUSED_STATE_SET 1292 * @see #WINDOW_FOCUSED_STATE_SET 1293 */ 1294 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1295 1296 /** 1297 * The order here is very important to {@link #getDrawableState()} 1298 */ 1299 private static final int[][] VIEW_STATE_SETS; 1300 1301 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1302 static final int VIEW_STATE_SELECTED = 1 << 1; 1303 static final int VIEW_STATE_FOCUSED = 1 << 2; 1304 static final int VIEW_STATE_ENABLED = 1 << 3; 1305 static final int VIEW_STATE_PRESSED = 1 << 4; 1306 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1307 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1308 1309 static final int[] VIEW_STATE_IDS = new int[] { 1310 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1311 R.attr.state_selected, VIEW_STATE_SELECTED, 1312 R.attr.state_focused, VIEW_STATE_FOCUSED, 1313 R.attr.state_enabled, VIEW_STATE_ENABLED, 1314 R.attr.state_pressed, VIEW_STATE_PRESSED, 1315 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1316 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1317 }; 1318 1319 static { 1320 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1321 throw new IllegalStateException( 1322 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1323 } 1324 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1325 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1326 int viewState = R.styleable.ViewDrawableStates[i]; 1327 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1328 if (VIEW_STATE_IDS[j] == viewState) { 1329 orderedIds[i * 2] = viewState; 1330 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1331 } 1332 } 1333 } 1334 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1335 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1336 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1337 int numBits = Integer.bitCount(i); 1338 int[] set = new int[numBits]; 1339 int pos = 0; 1340 for (int j = 0; j < orderedIds.length; j += 2) { 1341 if ((i & orderedIds[j+1]) != 0) { 1342 set[pos++] = orderedIds[j]; 1343 } 1344 } 1345 VIEW_STATE_SETS[i] = set; 1346 } 1347 1348 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1349 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1350 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1351 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1352 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1353 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1354 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1355 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1356 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1357 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1358 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1359 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1360 | VIEW_STATE_FOCUSED]; 1361 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1362 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1363 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1364 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1365 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1366 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1367 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1368 | VIEW_STATE_ENABLED]; 1369 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1370 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1371 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1372 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1373 | VIEW_STATE_ENABLED]; 1374 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1375 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1376 | VIEW_STATE_ENABLED]; 1377 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1378 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1379 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1380 1381 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1382 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1383 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1384 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1385 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1386 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1387 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1388 | VIEW_STATE_PRESSED]; 1389 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1390 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1391 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1392 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1393 | VIEW_STATE_PRESSED]; 1394 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1395 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1396 | VIEW_STATE_PRESSED]; 1397 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1398 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1399 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1400 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1401 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1402 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1403 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1404 | VIEW_STATE_PRESSED]; 1405 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1406 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1407 | VIEW_STATE_PRESSED]; 1408 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1409 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1410 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1411 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1412 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1413 | VIEW_STATE_PRESSED]; 1414 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1415 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1416 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1417 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1418 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1419 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1420 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1421 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1422 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1423 | VIEW_STATE_PRESSED]; 1424 } 1425 1426 /** 1427 * Temporary Rect currently for use in setBackground(). This will probably 1428 * be extended in the future to hold our own class with more than just 1429 * a Rect. :) 1430 */ 1431 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1432 1433 /** 1434 * Map used to store views' tags. 1435 */ 1436 private static WeakHashMap<View, SparseArray<Object>> sTags; 1437 1438 /** 1439 * Lock used to access sTags. 1440 */ 1441 private static final Object sTagsLock = new Object(); 1442 1443 /** 1444 * The animation currently associated with this view. 1445 * @hide 1446 */ 1447 protected Animation mCurrentAnimation = null; 1448 1449 /** 1450 * Width as measured during measure pass. 1451 * {@hide} 1452 */ 1453 @ViewDebug.ExportedProperty(category = "measurement") 1454 int mMeasuredWidth; 1455 1456 /** 1457 * Height as measured during measure pass. 1458 * {@hide} 1459 */ 1460 @ViewDebug.ExportedProperty(category = "measurement") 1461 int mMeasuredHeight; 1462 1463 /** 1464 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1465 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1466 * its display list. This flag, used only when hw accelerated, allows us to clear the 1467 * flag while retaining this information until it's needed (at getDisplayList() time and 1468 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1469 * 1470 * {@hide} 1471 */ 1472 boolean mRecreateDisplayList = false; 1473 1474 /** 1475 * The view's identifier. 1476 * {@hide} 1477 * 1478 * @see #setId(int) 1479 * @see #getId() 1480 */ 1481 @ViewDebug.ExportedProperty(resolveId = true) 1482 int mID = NO_ID; 1483 1484 /** 1485 * The view's tag. 1486 * {@hide} 1487 * 1488 * @see #setTag(Object) 1489 * @see #getTag() 1490 */ 1491 protected Object mTag; 1492 1493 // for mPrivateFlags: 1494 /** {@hide} */ 1495 static final int WANTS_FOCUS = 0x00000001; 1496 /** {@hide} */ 1497 static final int FOCUSED = 0x00000002; 1498 /** {@hide} */ 1499 static final int SELECTED = 0x00000004; 1500 /** {@hide} */ 1501 static final int IS_ROOT_NAMESPACE = 0x00000008; 1502 /** {@hide} */ 1503 static final int HAS_BOUNDS = 0x00000010; 1504 /** {@hide} */ 1505 static final int DRAWN = 0x00000020; 1506 /** 1507 * When this flag is set, this view is running an animation on behalf of its 1508 * children and should therefore not cancel invalidate requests, even if they 1509 * lie outside of this view's bounds. 1510 * 1511 * {@hide} 1512 */ 1513 static final int DRAW_ANIMATION = 0x00000040; 1514 /** {@hide} */ 1515 static final int SKIP_DRAW = 0x00000080; 1516 /** {@hide} */ 1517 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1518 /** {@hide} */ 1519 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1520 /** {@hide} */ 1521 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1522 /** {@hide} */ 1523 static final int MEASURED_DIMENSION_SET = 0x00000800; 1524 /** {@hide} */ 1525 static final int FORCE_LAYOUT = 0x00001000; 1526 /** {@hide} */ 1527 static final int LAYOUT_REQUIRED = 0x00002000; 1528 1529 private static final int PRESSED = 0x00004000; 1530 1531 /** {@hide} */ 1532 static final int DRAWING_CACHE_VALID = 0x00008000; 1533 /** 1534 * Flag used to indicate that this view should be drawn once more (and only once 1535 * more) after its animation has completed. 1536 * {@hide} 1537 */ 1538 static final int ANIMATION_STARTED = 0x00010000; 1539 1540 private static final int SAVE_STATE_CALLED = 0x00020000; 1541 1542 /** 1543 * Indicates that the View returned true when onSetAlpha() was called and that 1544 * the alpha must be restored. 1545 * {@hide} 1546 */ 1547 static final int ALPHA_SET = 0x00040000; 1548 1549 /** 1550 * Set by {@link #setScrollContainer(boolean)}. 1551 */ 1552 static final int SCROLL_CONTAINER = 0x00080000; 1553 1554 /** 1555 * Set by {@link #setScrollContainer(boolean)}. 1556 */ 1557 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1558 1559 /** 1560 * View flag indicating whether this view was invalidated (fully or partially.) 1561 * 1562 * @hide 1563 */ 1564 static final int DIRTY = 0x00200000; 1565 1566 /** 1567 * View flag indicating whether this view was invalidated by an opaque 1568 * invalidate request. 1569 * 1570 * @hide 1571 */ 1572 static final int DIRTY_OPAQUE = 0x00400000; 1573 1574 /** 1575 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1576 * 1577 * @hide 1578 */ 1579 static final int DIRTY_MASK = 0x00600000; 1580 1581 /** 1582 * Indicates whether the background is opaque. 1583 * 1584 * @hide 1585 */ 1586 static final int OPAQUE_BACKGROUND = 0x00800000; 1587 1588 /** 1589 * Indicates whether the scrollbars are opaque. 1590 * 1591 * @hide 1592 */ 1593 static final int OPAQUE_SCROLLBARS = 0x01000000; 1594 1595 /** 1596 * Indicates whether the view is opaque. 1597 * 1598 * @hide 1599 */ 1600 static final int OPAQUE_MASK = 0x01800000; 1601 1602 /** 1603 * Indicates a prepressed state; 1604 * the short time between ACTION_DOWN and recognizing 1605 * a 'real' press. Prepressed is used to recognize quick taps 1606 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1607 * 1608 * @hide 1609 */ 1610 private static final int PREPRESSED = 0x02000000; 1611 1612 /** 1613 * Indicates whether the view is temporarily detached. 1614 * 1615 * @hide 1616 */ 1617 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1618 1619 /** 1620 * Indicates that we should awaken scroll bars once attached 1621 * 1622 * @hide 1623 */ 1624 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1625 1626 /** 1627 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1628 * for transform operations 1629 * 1630 * @hide 1631 */ 1632 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1633 1634 /** {@hide} */ 1635 static final int ACTIVATED = 0x40000000; 1636 1637 /** 1638 * Indicates that this view was specifically invalidated, not just dirtied because some 1639 * child view was invalidated. The flag is used to determine when we need to recreate 1640 * a view's display list (as opposed to just returning a reference to its existing 1641 * display list). 1642 * 1643 * @hide 1644 */ 1645 static final int INVALIDATED = 0x80000000; 1646 1647 /** 1648 * Always allow a user to over-scroll this view, provided it is a 1649 * view that can scroll. 1650 * 1651 * @see #getOverScrollMode() 1652 * @see #setOverScrollMode(int) 1653 */ 1654 public static final int OVER_SCROLL_ALWAYS = 0; 1655 1656 /** 1657 * Allow a user to over-scroll this view only if the content is large 1658 * enough to meaningfully scroll, provided it is a view that can scroll. 1659 * 1660 * @see #getOverScrollMode() 1661 * @see #setOverScrollMode(int) 1662 */ 1663 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1664 1665 /** 1666 * Never allow a user to over-scroll this view. 1667 * 1668 * @see #getOverScrollMode() 1669 * @see #setOverScrollMode(int) 1670 */ 1671 public static final int OVER_SCROLL_NEVER = 2; 1672 1673 /** 1674 * View has requested the status bar to be visible (the default). 1675 * 1676 * @see #setSystemUiVisibility(int) 1677 */ 1678 public static final int STATUS_BAR_VISIBLE = 0; 1679 1680 /** 1681 * View has requested the status bar to be visible (the default). 1682 * 1683 * @see #setSystemUiVisibility(int) 1684 */ 1685 public static final int STATUS_BAR_HIDDEN = 0x00000001; 1686 1687 /** 1688 * @hide 1689 * 1690 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1691 * out of the public fields to keep the undefined bits out of the developer's way. 1692 * 1693 * Flag to make the status bar not expandable. Unless you also 1694 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1695 */ 1696 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1697 1698 /** 1699 * @hide 1700 * 1701 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1702 * out of the public fields to keep the undefined bits out of the developer's way. 1703 * 1704 * Flag to hide notification icons and scrolling ticker text. 1705 */ 1706 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1707 1708 /** 1709 * @hide 1710 * 1711 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1712 * out of the public fields to keep the undefined bits out of the developer's way. 1713 * 1714 * Flag to disable incoming notification alerts. This will not block 1715 * icons, but it will block sound, vibrating and other visual or aural notifications. 1716 */ 1717 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1718 1719 /** 1720 * @hide 1721 * 1722 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1723 * out of the public fields to keep the undefined bits out of the developer's way. 1724 * 1725 * Flag to hide only the scrolling ticker. Note that 1726 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1727 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1728 */ 1729 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1730 1731 /** 1732 * @hide 1733 * 1734 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1735 * out of the public fields to keep the undefined bits out of the developer's way. 1736 * 1737 * Flag to hide the center system info area. 1738 */ 1739 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1740 1741 /** 1742 * @hide 1743 * 1744 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1745 * out of the public fields to keep the undefined bits out of the developer's way. 1746 * 1747 * Flag to hide only the navigation buttons. Don't use this 1748 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1749 * 1750 * THIS DOES NOT DISABLE THE BACK BUTTON 1751 */ 1752 public static final int STATUS_BAR_DISABLE_NAVIGATION = 0x00200000; 1753 1754 /** 1755 * @hide 1756 * 1757 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1758 * out of the public fields to keep the undefined bits out of the developer's way. 1759 * 1760 * Flag to hide only the back button. Don't use this 1761 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1762 */ 1763 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1764 1765 /** 1766 * @hide 1767 * 1768 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1769 * out of the public fields to keep the undefined bits out of the developer's way. 1770 * 1771 * Flag to hide only the clock. You might use this if your activity has 1772 * its own clock making the status bar's clock redundant. 1773 */ 1774 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1775 1776 /** 1777 * @hide 1778 */ 1779 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = STATUS_BAR_HIDDEN; 1780 1781 /** 1782 * Controls the over-scroll mode for this view. 1783 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1784 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1785 * and {@link #OVER_SCROLL_NEVER}. 1786 */ 1787 private int mOverScrollMode; 1788 1789 /** 1790 * The parent this view is attached to. 1791 * {@hide} 1792 * 1793 * @see #getParent() 1794 */ 1795 protected ViewParent mParent; 1796 1797 /** 1798 * {@hide} 1799 */ 1800 AttachInfo mAttachInfo; 1801 1802 /** 1803 * {@hide} 1804 */ 1805 @ViewDebug.ExportedProperty(flagMapping = { 1806 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1807 name = "FORCE_LAYOUT"), 1808 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1809 name = "LAYOUT_REQUIRED"), 1810 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1811 name = "DRAWING_CACHE_INVALID", outputIf = false), 1812 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1813 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1814 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1815 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1816 }) 1817 int mPrivateFlags; 1818 1819 /** 1820 * This view's request for the visibility of the status bar. 1821 * @hide 1822 */ 1823 @ViewDebug.ExportedProperty() 1824 int mSystemUiVisibility; 1825 1826 /** 1827 * Count of how many windows this view has been attached to. 1828 */ 1829 int mWindowAttachCount; 1830 1831 /** 1832 * The layout parameters associated with this view and used by the parent 1833 * {@link android.view.ViewGroup} to determine how this view should be 1834 * laid out. 1835 * {@hide} 1836 */ 1837 protected ViewGroup.LayoutParams mLayoutParams; 1838 1839 /** 1840 * The view flags hold various views states. 1841 * {@hide} 1842 */ 1843 @ViewDebug.ExportedProperty 1844 int mViewFlags; 1845 1846 /** 1847 * The transform matrix for the View. This transform is calculated internally 1848 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1849 * is used by default. Do *not* use this variable directly; instead call 1850 * getMatrix(), which will automatically recalculate the matrix if necessary 1851 * to get the correct matrix based on the latest rotation and scale properties. 1852 */ 1853 private final Matrix mMatrix = new Matrix(); 1854 1855 /** 1856 * The transform matrix for the View. This transform is calculated internally 1857 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1858 * is used by default. Do *not* use this variable directly; instead call 1859 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1860 * to get the correct matrix based on the latest rotation and scale properties. 1861 */ 1862 private Matrix mInverseMatrix; 1863 1864 /** 1865 * An internal variable that tracks whether we need to recalculate the 1866 * transform matrix, based on whether the rotation or scaleX/Y properties 1867 * have changed since the matrix was last calculated. 1868 */ 1869 boolean mMatrixDirty = false; 1870 1871 /** 1872 * An internal variable that tracks whether we need to recalculate the 1873 * transform matrix, based on whether the rotation or scaleX/Y properties 1874 * have changed since the matrix was last calculated. 1875 */ 1876 private boolean mInverseMatrixDirty = true; 1877 1878 /** 1879 * A variable that tracks whether we need to recalculate the 1880 * transform matrix, based on whether the rotation or scaleX/Y properties 1881 * have changed since the matrix was last calculated. This variable 1882 * is only valid after a call to updateMatrix() or to a function that 1883 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1884 */ 1885 private boolean mMatrixIsIdentity = true; 1886 1887 /** 1888 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1889 */ 1890 private Camera mCamera = null; 1891 1892 /** 1893 * This matrix is used when computing the matrix for 3D rotations. 1894 */ 1895 private Matrix matrix3D = null; 1896 1897 /** 1898 * These prev values are used to recalculate a centered pivot point when necessary. The 1899 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1900 * set), so thes values are only used then as well. 1901 */ 1902 private int mPrevWidth = -1; 1903 private int mPrevHeight = -1; 1904 1905 private boolean mLastIsOpaque; 1906 1907 /** 1908 * Convenience value to check for float values that are close enough to zero to be considered 1909 * zero. 1910 */ 1911 private static final float NONZERO_EPSILON = .001f; 1912 1913 /** 1914 * The degrees rotation around the vertical axis through the pivot point. 1915 */ 1916 @ViewDebug.ExportedProperty 1917 float mRotationY = 0f; 1918 1919 /** 1920 * The degrees rotation around the horizontal axis through the pivot point. 1921 */ 1922 @ViewDebug.ExportedProperty 1923 float mRotationX = 0f; 1924 1925 /** 1926 * The degrees rotation around the pivot point. 1927 */ 1928 @ViewDebug.ExportedProperty 1929 float mRotation = 0f; 1930 1931 /** 1932 * The amount of translation of the object away from its left property (post-layout). 1933 */ 1934 @ViewDebug.ExportedProperty 1935 float mTranslationX = 0f; 1936 1937 /** 1938 * The amount of translation of the object away from its top property (post-layout). 1939 */ 1940 @ViewDebug.ExportedProperty 1941 float mTranslationY = 0f; 1942 1943 /** 1944 * The amount of scale in the x direction around the pivot point. A 1945 * value of 1 means no scaling is applied. 1946 */ 1947 @ViewDebug.ExportedProperty 1948 float mScaleX = 1f; 1949 1950 /** 1951 * The amount of scale in the y direction around the pivot point. A 1952 * value of 1 means no scaling is applied. 1953 */ 1954 @ViewDebug.ExportedProperty 1955 float mScaleY = 1f; 1956 1957 /** 1958 * The amount of scale in the x direction around the pivot point. A 1959 * value of 1 means no scaling is applied. 1960 */ 1961 @ViewDebug.ExportedProperty 1962 float mPivotX = 0f; 1963 1964 /** 1965 * The amount of scale in the y direction around the pivot point. A 1966 * value of 1 means no scaling is applied. 1967 */ 1968 @ViewDebug.ExportedProperty 1969 float mPivotY = 0f; 1970 1971 /** 1972 * The opacity of the View. This is a value from 0 to 1, where 0 means 1973 * completely transparent and 1 means completely opaque. 1974 */ 1975 @ViewDebug.ExportedProperty 1976 float mAlpha = 1f; 1977 1978 /** 1979 * The distance in pixels from the left edge of this view's parent 1980 * to the left edge of this view. 1981 * {@hide} 1982 */ 1983 @ViewDebug.ExportedProperty(category = "layout") 1984 protected int mLeft; 1985 /** 1986 * The distance in pixels from the left edge of this view's parent 1987 * to the right edge of this view. 1988 * {@hide} 1989 */ 1990 @ViewDebug.ExportedProperty(category = "layout") 1991 protected int mRight; 1992 /** 1993 * The distance in pixels from the top edge of this view's parent 1994 * to the top edge of this view. 1995 * {@hide} 1996 */ 1997 @ViewDebug.ExportedProperty(category = "layout") 1998 protected int mTop; 1999 /** 2000 * The distance in pixels from the top edge of this view's parent 2001 * to the bottom edge of this view. 2002 * {@hide} 2003 */ 2004 @ViewDebug.ExportedProperty(category = "layout") 2005 protected int mBottom; 2006 2007 /** 2008 * The offset, in pixels, by which the content of this view is scrolled 2009 * horizontally. 2010 * {@hide} 2011 */ 2012 @ViewDebug.ExportedProperty(category = "scrolling") 2013 protected int mScrollX; 2014 /** 2015 * The offset, in pixels, by which the content of this view is scrolled 2016 * vertically. 2017 * {@hide} 2018 */ 2019 @ViewDebug.ExportedProperty(category = "scrolling") 2020 protected int mScrollY; 2021 2022 /** 2023 * The left padding in pixels, that is the distance in pixels between the 2024 * left edge of this view and the left edge of its content. 2025 * {@hide} 2026 */ 2027 @ViewDebug.ExportedProperty(category = "padding") 2028 protected int mPaddingLeft; 2029 /** 2030 * The right padding in pixels, that is the distance in pixels between the 2031 * right edge of this view and the right edge of its content. 2032 * {@hide} 2033 */ 2034 @ViewDebug.ExportedProperty(category = "padding") 2035 protected int mPaddingRight; 2036 /** 2037 * The top padding in pixels, that is the distance in pixels between the 2038 * top edge of this view and the top edge of its content. 2039 * {@hide} 2040 */ 2041 @ViewDebug.ExportedProperty(category = "padding") 2042 protected int mPaddingTop; 2043 /** 2044 * The bottom padding in pixels, that is the distance in pixels between the 2045 * bottom edge of this view and the bottom edge of its content. 2046 * {@hide} 2047 */ 2048 @ViewDebug.ExportedProperty(category = "padding") 2049 protected int mPaddingBottom; 2050 2051 /** 2052 * Briefly describes the view and is primarily used for accessibility support. 2053 */ 2054 private CharSequence mContentDescription; 2055 2056 /** 2057 * Cache the paddingRight set by the user to append to the scrollbar's size. 2058 */ 2059 @ViewDebug.ExportedProperty(category = "padding") 2060 int mUserPaddingRight; 2061 2062 /** 2063 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2064 */ 2065 @ViewDebug.ExportedProperty(category = "padding") 2066 int mUserPaddingBottom; 2067 2068 /** 2069 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2070 */ 2071 @ViewDebug.ExportedProperty(category = "padding") 2072 int mUserPaddingLeft; 2073 2074 /** 2075 * @hide 2076 */ 2077 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2078 /** 2079 * @hide 2080 */ 2081 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2082 2083 private Resources mResources = null; 2084 2085 private Drawable mBGDrawable; 2086 2087 private int mBackgroundResource; 2088 private boolean mBackgroundSizeChanged; 2089 2090 /** 2091 * Listener used to dispatch focus change events. 2092 * This field should be made private, so it is hidden from the SDK. 2093 * {@hide} 2094 */ 2095 protected OnFocusChangeListener mOnFocusChangeListener; 2096 2097 /** 2098 * Listeners for layout change events. 2099 */ 2100 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2101 2102 /** 2103 * Listeners for attach events. 2104 */ 2105 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2106 2107 /** 2108 * Listener used to dispatch click events. 2109 * This field should be made private, so it is hidden from the SDK. 2110 * {@hide} 2111 */ 2112 protected OnClickListener mOnClickListener; 2113 2114 /** 2115 * Listener used to dispatch long click events. 2116 * This field should be made private, so it is hidden from the SDK. 2117 * {@hide} 2118 */ 2119 protected OnLongClickListener mOnLongClickListener; 2120 2121 /** 2122 * Listener used to build the context menu. 2123 * This field should be made private, so it is hidden from the SDK. 2124 * {@hide} 2125 */ 2126 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2127 2128 private OnKeyListener mOnKeyListener; 2129 2130 private OnTouchListener mOnTouchListener; 2131 2132 private OnGenericMotionListener mOnGenericMotionListener; 2133 2134 private OnDragListener mOnDragListener; 2135 2136 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2137 2138 /** 2139 * The application environment this view lives in. 2140 * This field should be made private, so it is hidden from the SDK. 2141 * {@hide} 2142 */ 2143 protected Context mContext; 2144 2145 private ScrollabilityCache mScrollCache; 2146 2147 private int[] mDrawableState = null; 2148 2149 /** 2150 * Set to true when drawing cache is enabled and cannot be created. 2151 * 2152 * @hide 2153 */ 2154 public boolean mCachingFailed; 2155 2156 private Bitmap mDrawingCache; 2157 private Bitmap mUnscaledDrawingCache; 2158 private DisplayList mDisplayList; 2159 private HardwareLayer mHardwareLayer; 2160 2161 /** 2162 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2163 * the user may specify which view to go to next. 2164 */ 2165 private int mNextFocusLeftId = View.NO_ID; 2166 2167 /** 2168 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2169 * the user may specify which view to go to next. 2170 */ 2171 private int mNextFocusRightId = View.NO_ID; 2172 2173 /** 2174 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2175 * the user may specify which view to go to next. 2176 */ 2177 private int mNextFocusUpId = View.NO_ID; 2178 2179 /** 2180 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2181 * the user may specify which view to go to next. 2182 */ 2183 private int mNextFocusDownId = View.NO_ID; 2184 2185 /** 2186 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2187 * the user may specify which view to go to next. 2188 */ 2189 int mNextFocusForwardId = View.NO_ID; 2190 2191 private CheckForLongPress mPendingCheckForLongPress; 2192 private CheckForTap mPendingCheckForTap = null; 2193 private PerformClick mPerformClick; 2194 2195 private UnsetPressedState mUnsetPressedState; 2196 2197 /** 2198 * Whether the long press's action has been invoked. The tap's action is invoked on the 2199 * up event while a long press is invoked as soon as the long press duration is reached, so 2200 * a long press could be performed before the tap is checked, in which case the tap's action 2201 * should not be invoked. 2202 */ 2203 private boolean mHasPerformedLongPress; 2204 2205 /** 2206 * The minimum height of the view. We'll try our best to have the height 2207 * of this view to at least this amount. 2208 */ 2209 @ViewDebug.ExportedProperty(category = "measurement") 2210 private int mMinHeight; 2211 2212 /** 2213 * The minimum width of the view. We'll try our best to have the width 2214 * of this view to at least this amount. 2215 */ 2216 @ViewDebug.ExportedProperty(category = "measurement") 2217 private int mMinWidth; 2218 2219 /** 2220 * The delegate to handle touch events that are physically in this view 2221 * but should be handled by another view. 2222 */ 2223 private TouchDelegate mTouchDelegate = null; 2224 2225 /** 2226 * Solid color to use as a background when creating the drawing cache. Enables 2227 * the cache to use 16 bit bitmaps instead of 32 bit. 2228 */ 2229 private int mDrawingCacheBackgroundColor = 0; 2230 2231 /** 2232 * Special tree observer used when mAttachInfo is null. 2233 */ 2234 private ViewTreeObserver mFloatingTreeObserver; 2235 2236 /** 2237 * Cache the touch slop from the context that created the view. 2238 */ 2239 private int mTouchSlop; 2240 2241 /** 2242 * Object that handles automatic animation of view properties. 2243 */ 2244 private ViewPropertyAnimator mAnimator = null; 2245 2246 /** 2247 * Cache drag/drop state 2248 * 2249 */ 2250 boolean mCanAcceptDrop; 2251 2252 /** 2253 * Flag indicating that a drag can cross window boundaries. When 2254 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2255 * with this flag set, all visible applications will be able to participate 2256 * in the drag operation and receive the dragged content. 2257 * 2258 * @hide 2259 */ 2260 public static final int DRAG_FLAG_GLOBAL = 1; 2261 2262 /** 2263 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2264 */ 2265 private float mVerticalScrollFactor; 2266 2267 /** 2268 * Position of the vertical scroll bar. 2269 */ 2270 private int mVerticalScrollbarPosition; 2271 2272 /** 2273 * Position the scroll bar at the default position as determined by the system. 2274 */ 2275 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2276 2277 /** 2278 * Position the scroll bar along the left edge. 2279 */ 2280 public static final int SCROLLBAR_POSITION_LEFT = 1; 2281 2282 /** 2283 * Position the scroll bar along the right edge. 2284 */ 2285 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2286 2287 /** 2288 * Indicates that the view does not have a layer. 2289 * 2290 * @see #getLayerType() 2291 * @see #setLayerType(int, android.graphics.Paint) 2292 * @see #LAYER_TYPE_SOFTWARE 2293 * @see #LAYER_TYPE_HARDWARE 2294 */ 2295 public static final int LAYER_TYPE_NONE = 0; 2296 2297 /** 2298 * <p>Indicates that the view has a software layer. A software layer is backed 2299 * by a bitmap and causes the view to be rendered using Android's software 2300 * rendering pipeline, even if hardware acceleration is enabled.</p> 2301 * 2302 * <p>Software layers have various usages:</p> 2303 * <p>When the application is not using hardware acceleration, a software layer 2304 * is useful to apply a specific color filter and/or blending mode and/or 2305 * translucency to a view and all its children.</p> 2306 * <p>When the application is using hardware acceleration, a software layer 2307 * is useful to render drawing primitives not supported by the hardware 2308 * accelerated pipeline. It can also be used to cache a complex view tree 2309 * into a texture and reduce the complexity of drawing operations. For instance, 2310 * when animating a complex view tree with a translation, a software layer can 2311 * be used to render the view tree only once.</p> 2312 * <p>Software layers should be avoided when the affected view tree updates 2313 * often. Every update will require to re-render the software layer, which can 2314 * potentially be slow (particularly when hardware acceleration is turned on 2315 * since the layer will have to be uploaded into a hardware texture after every 2316 * update.)</p> 2317 * 2318 * @see #getLayerType() 2319 * @see #setLayerType(int, android.graphics.Paint) 2320 * @see #LAYER_TYPE_NONE 2321 * @see #LAYER_TYPE_HARDWARE 2322 */ 2323 public static final int LAYER_TYPE_SOFTWARE = 1; 2324 2325 /** 2326 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2327 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2328 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2329 * rendering pipeline, but only if hardware acceleration is turned on for the 2330 * view hierarchy. When hardware acceleration is turned off, hardware layers 2331 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2332 * 2333 * <p>A hardware layer is useful to apply a specific color filter and/or 2334 * blending mode and/or translucency to a view and all its children.</p> 2335 * <p>A hardware layer can be used to cache a complex view tree into a 2336 * texture and reduce the complexity of drawing operations. For instance, 2337 * when animating a complex view tree with a translation, a hardware layer can 2338 * be used to render the view tree only once.</p> 2339 * <p>A hardware layer can also be used to increase the rendering quality when 2340 * rotation transformations are applied on a view. It can also be used to 2341 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2342 * 2343 * @see #getLayerType() 2344 * @see #setLayerType(int, android.graphics.Paint) 2345 * @see #LAYER_TYPE_NONE 2346 * @see #LAYER_TYPE_SOFTWARE 2347 */ 2348 public static final int LAYER_TYPE_HARDWARE = 2; 2349 2350 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2351 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2352 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2353 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2354 }) 2355 int mLayerType = LAYER_TYPE_NONE; 2356 Paint mLayerPaint; 2357 Rect mLocalDirtyRect; 2358 2359 /** 2360 * Simple constructor to use when creating a view from code. 2361 * 2362 * @param context The Context the view is running in, through which it can 2363 * access the current theme, resources, etc. 2364 */ 2365 public View(Context context) { 2366 mContext = context; 2367 mResources = context != null ? context.getResources() : null; 2368 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2369 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2370 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2371 } 2372 2373 /** 2374 * Constructor that is called when inflating a view from XML. This is called 2375 * when a view is being constructed from an XML file, supplying attributes 2376 * that were specified in the XML file. This version uses a default style of 2377 * 0, so the only attribute values applied are those in the Context's Theme 2378 * and the given AttributeSet. 2379 * 2380 * <p> 2381 * The method onFinishInflate() will be called after all children have been 2382 * added. 2383 * 2384 * @param context The Context the view is running in, through which it can 2385 * access the current theme, resources, etc. 2386 * @param attrs The attributes of the XML tag that is inflating the view. 2387 * @see #View(Context, AttributeSet, int) 2388 */ 2389 public View(Context context, AttributeSet attrs) { 2390 this(context, attrs, 0); 2391 } 2392 2393 /** 2394 * Perform inflation from XML and apply a class-specific base style. This 2395 * constructor of View allows subclasses to use their own base style when 2396 * they are inflating. For example, a Button class's constructor would call 2397 * this version of the super class constructor and supply 2398 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2399 * the theme's button style to modify all of the base view attributes (in 2400 * particular its background) as well as the Button class's attributes. 2401 * 2402 * @param context The Context the view is running in, through which it can 2403 * access the current theme, resources, etc. 2404 * @param attrs The attributes of the XML tag that is inflating the view. 2405 * @param defStyle The default style to apply to this view. If 0, no style 2406 * will be applied (beyond what is included in the theme). This may 2407 * either be an attribute resource, whose value will be retrieved 2408 * from the current theme, or an explicit style resource. 2409 * @see #View(Context, AttributeSet) 2410 */ 2411 public View(Context context, AttributeSet attrs, int defStyle) { 2412 this(context); 2413 2414 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2415 defStyle, 0); 2416 2417 Drawable background = null; 2418 2419 int leftPadding = -1; 2420 int topPadding = -1; 2421 int rightPadding = -1; 2422 int bottomPadding = -1; 2423 2424 int padding = -1; 2425 2426 int viewFlagValues = 0; 2427 int viewFlagMasks = 0; 2428 2429 boolean setScrollContainer = false; 2430 2431 int x = 0; 2432 int y = 0; 2433 2434 float tx = 0; 2435 float ty = 0; 2436 float rotation = 0; 2437 float rotationX = 0; 2438 float rotationY = 0; 2439 float sx = 1f; 2440 float sy = 1f; 2441 boolean transformSet = false; 2442 2443 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2444 2445 int overScrollMode = mOverScrollMode; 2446 final int N = a.getIndexCount(); 2447 for (int i = 0; i < N; i++) { 2448 int attr = a.getIndex(i); 2449 switch (attr) { 2450 case com.android.internal.R.styleable.View_background: 2451 background = a.getDrawable(attr); 2452 break; 2453 case com.android.internal.R.styleable.View_padding: 2454 padding = a.getDimensionPixelSize(attr, -1); 2455 break; 2456 case com.android.internal.R.styleable.View_paddingLeft: 2457 leftPadding = a.getDimensionPixelSize(attr, -1); 2458 break; 2459 case com.android.internal.R.styleable.View_paddingTop: 2460 topPadding = a.getDimensionPixelSize(attr, -1); 2461 break; 2462 case com.android.internal.R.styleable.View_paddingRight: 2463 rightPadding = a.getDimensionPixelSize(attr, -1); 2464 break; 2465 case com.android.internal.R.styleable.View_paddingBottom: 2466 bottomPadding = a.getDimensionPixelSize(attr, -1); 2467 break; 2468 case com.android.internal.R.styleable.View_scrollX: 2469 x = a.getDimensionPixelOffset(attr, 0); 2470 break; 2471 case com.android.internal.R.styleable.View_scrollY: 2472 y = a.getDimensionPixelOffset(attr, 0); 2473 break; 2474 case com.android.internal.R.styleable.View_alpha: 2475 setAlpha(a.getFloat(attr, 1f)); 2476 break; 2477 case com.android.internal.R.styleable.View_transformPivotX: 2478 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2479 break; 2480 case com.android.internal.R.styleable.View_transformPivotY: 2481 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2482 break; 2483 case com.android.internal.R.styleable.View_translationX: 2484 tx = a.getDimensionPixelOffset(attr, 0); 2485 transformSet = true; 2486 break; 2487 case com.android.internal.R.styleable.View_translationY: 2488 ty = a.getDimensionPixelOffset(attr, 0); 2489 transformSet = true; 2490 break; 2491 case com.android.internal.R.styleable.View_rotation: 2492 rotation = a.getFloat(attr, 0); 2493 transformSet = true; 2494 break; 2495 case com.android.internal.R.styleable.View_rotationX: 2496 rotationX = a.getFloat(attr, 0); 2497 transformSet = true; 2498 break; 2499 case com.android.internal.R.styleable.View_rotationY: 2500 rotationY = a.getFloat(attr, 0); 2501 transformSet = true; 2502 break; 2503 case com.android.internal.R.styleable.View_scaleX: 2504 sx = a.getFloat(attr, 1f); 2505 transformSet = true; 2506 break; 2507 case com.android.internal.R.styleable.View_scaleY: 2508 sy = a.getFloat(attr, 1f); 2509 transformSet = true; 2510 break; 2511 case com.android.internal.R.styleable.View_id: 2512 mID = a.getResourceId(attr, NO_ID); 2513 break; 2514 case com.android.internal.R.styleable.View_tag: 2515 mTag = a.getText(attr); 2516 break; 2517 case com.android.internal.R.styleable.View_fitsSystemWindows: 2518 if (a.getBoolean(attr, false)) { 2519 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2520 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2521 } 2522 break; 2523 case com.android.internal.R.styleable.View_focusable: 2524 if (a.getBoolean(attr, false)) { 2525 viewFlagValues |= FOCUSABLE; 2526 viewFlagMasks |= FOCUSABLE_MASK; 2527 } 2528 break; 2529 case com.android.internal.R.styleable.View_focusableInTouchMode: 2530 if (a.getBoolean(attr, false)) { 2531 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2532 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2533 } 2534 break; 2535 case com.android.internal.R.styleable.View_clickable: 2536 if (a.getBoolean(attr, false)) { 2537 viewFlagValues |= CLICKABLE; 2538 viewFlagMasks |= CLICKABLE; 2539 } 2540 break; 2541 case com.android.internal.R.styleable.View_longClickable: 2542 if (a.getBoolean(attr, false)) { 2543 viewFlagValues |= LONG_CLICKABLE; 2544 viewFlagMasks |= LONG_CLICKABLE; 2545 } 2546 break; 2547 case com.android.internal.R.styleable.View_saveEnabled: 2548 if (!a.getBoolean(attr, true)) { 2549 viewFlagValues |= SAVE_DISABLED; 2550 viewFlagMasks |= SAVE_DISABLED_MASK; 2551 } 2552 break; 2553 case com.android.internal.R.styleable.View_duplicateParentState: 2554 if (a.getBoolean(attr, false)) { 2555 viewFlagValues |= DUPLICATE_PARENT_STATE; 2556 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2557 } 2558 break; 2559 case com.android.internal.R.styleable.View_visibility: 2560 final int visibility = a.getInt(attr, 0); 2561 if (visibility != 0) { 2562 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2563 viewFlagMasks |= VISIBILITY_MASK; 2564 } 2565 break; 2566 case com.android.internal.R.styleable.View_drawingCacheQuality: 2567 final int cacheQuality = a.getInt(attr, 0); 2568 if (cacheQuality != 0) { 2569 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2570 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2571 } 2572 break; 2573 case com.android.internal.R.styleable.View_contentDescription: 2574 mContentDescription = a.getString(attr); 2575 break; 2576 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2577 if (!a.getBoolean(attr, true)) { 2578 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2579 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2580 } 2581 break; 2582 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2583 if (!a.getBoolean(attr, true)) { 2584 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2585 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2586 } 2587 break; 2588 case R.styleable.View_scrollbars: 2589 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2590 if (scrollbars != SCROLLBARS_NONE) { 2591 viewFlagValues |= scrollbars; 2592 viewFlagMasks |= SCROLLBARS_MASK; 2593 initializeScrollbars(a); 2594 } 2595 break; 2596 case R.styleable.View_fadingEdge: 2597 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2598 if (fadingEdge != FADING_EDGE_NONE) { 2599 viewFlagValues |= fadingEdge; 2600 viewFlagMasks |= FADING_EDGE_MASK; 2601 initializeFadingEdge(a); 2602 } 2603 break; 2604 case R.styleable.View_scrollbarStyle: 2605 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2606 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2607 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2608 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2609 } 2610 break; 2611 case R.styleable.View_isScrollContainer: 2612 setScrollContainer = true; 2613 if (a.getBoolean(attr, false)) { 2614 setScrollContainer(true); 2615 } 2616 break; 2617 case com.android.internal.R.styleable.View_keepScreenOn: 2618 if (a.getBoolean(attr, false)) { 2619 viewFlagValues |= KEEP_SCREEN_ON; 2620 viewFlagMasks |= KEEP_SCREEN_ON; 2621 } 2622 break; 2623 case R.styleable.View_filterTouchesWhenObscured: 2624 if (a.getBoolean(attr, false)) { 2625 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2626 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2627 } 2628 break; 2629 case R.styleable.View_nextFocusLeft: 2630 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2631 break; 2632 case R.styleable.View_nextFocusRight: 2633 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2634 break; 2635 case R.styleable.View_nextFocusUp: 2636 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2637 break; 2638 case R.styleable.View_nextFocusDown: 2639 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2640 break; 2641 case R.styleable.View_nextFocusForward: 2642 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2643 break; 2644 case R.styleable.View_minWidth: 2645 mMinWidth = a.getDimensionPixelSize(attr, 0); 2646 break; 2647 case R.styleable.View_minHeight: 2648 mMinHeight = a.getDimensionPixelSize(attr, 0); 2649 break; 2650 case R.styleable.View_onClick: 2651 if (context.isRestricted()) { 2652 throw new IllegalStateException("The android:onClick attribute cannot " 2653 + "be used within a restricted context"); 2654 } 2655 2656 final String handlerName = a.getString(attr); 2657 if (handlerName != null) { 2658 setOnClickListener(new OnClickListener() { 2659 private Method mHandler; 2660 2661 public void onClick(View v) { 2662 if (mHandler == null) { 2663 try { 2664 mHandler = getContext().getClass().getMethod(handlerName, 2665 View.class); 2666 } catch (NoSuchMethodException e) { 2667 int id = getId(); 2668 String idText = id == NO_ID ? "" : " with id '" 2669 + getContext().getResources().getResourceEntryName( 2670 id) + "'"; 2671 throw new IllegalStateException("Could not find a method " + 2672 handlerName + "(View) in the activity " 2673 + getContext().getClass() + " for onClick handler" 2674 + " on view " + View.this.getClass() + idText, e); 2675 } 2676 } 2677 2678 try { 2679 mHandler.invoke(getContext(), View.this); 2680 } catch (IllegalAccessException e) { 2681 throw new IllegalStateException("Could not execute non " 2682 + "public method of the activity", e); 2683 } catch (InvocationTargetException e) { 2684 throw new IllegalStateException("Could not execute " 2685 + "method of the activity", e); 2686 } 2687 } 2688 }); 2689 } 2690 break; 2691 case R.styleable.View_overScrollMode: 2692 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2693 break; 2694 case R.styleable.View_verticalScrollbarPosition: 2695 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2696 break; 2697 case R.styleable.View_layerType: 2698 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2699 break; 2700 } 2701 } 2702 2703 setOverScrollMode(overScrollMode); 2704 2705 if (background != null) { 2706 setBackgroundDrawable(background); 2707 } 2708 2709 if (padding >= 0) { 2710 leftPadding = padding; 2711 topPadding = padding; 2712 rightPadding = padding; 2713 bottomPadding = padding; 2714 } 2715 2716 // If the user specified the padding (either with android:padding or 2717 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2718 // use the default padding or the padding from the background drawable 2719 // (stored at this point in mPadding*) 2720 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2721 topPadding >= 0 ? topPadding : mPaddingTop, 2722 rightPadding >= 0 ? rightPadding : mPaddingRight, 2723 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2724 2725 if (viewFlagMasks != 0) { 2726 setFlags(viewFlagValues, viewFlagMasks); 2727 } 2728 2729 // Needs to be called after mViewFlags is set 2730 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2731 recomputePadding(); 2732 } 2733 2734 if (x != 0 || y != 0) { 2735 scrollTo(x, y); 2736 } 2737 2738 if (transformSet) { 2739 setTranslationX(tx); 2740 setTranslationY(ty); 2741 setRotation(rotation); 2742 setRotationX(rotationX); 2743 setRotationY(rotationY); 2744 setScaleX(sx); 2745 setScaleY(sy); 2746 } 2747 2748 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2749 setScrollContainer(true); 2750 } 2751 2752 computeOpaqueFlags(); 2753 2754 a.recycle(); 2755 } 2756 2757 /** 2758 * Non-public constructor for use in testing 2759 */ 2760 View() { 2761 } 2762 2763 /** 2764 * <p> 2765 * Initializes the fading edges from a given set of styled attributes. This 2766 * method should be called by subclasses that need fading edges and when an 2767 * instance of these subclasses is created programmatically rather than 2768 * being inflated from XML. This method is automatically called when the XML 2769 * is inflated. 2770 * </p> 2771 * 2772 * @param a the styled attributes set to initialize the fading edges from 2773 */ 2774 protected void initializeFadingEdge(TypedArray a) { 2775 initScrollCache(); 2776 2777 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2778 R.styleable.View_fadingEdgeLength, 2779 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2780 } 2781 2782 /** 2783 * Returns the size of the vertical faded edges used to indicate that more 2784 * content in this view is visible. 2785 * 2786 * @return The size in pixels of the vertical faded edge or 0 if vertical 2787 * faded edges are not enabled for this view. 2788 * @attr ref android.R.styleable#View_fadingEdgeLength 2789 */ 2790 public int getVerticalFadingEdgeLength() { 2791 if (isVerticalFadingEdgeEnabled()) { 2792 ScrollabilityCache cache = mScrollCache; 2793 if (cache != null) { 2794 return cache.fadingEdgeLength; 2795 } 2796 } 2797 return 0; 2798 } 2799 2800 /** 2801 * Set the size of the faded edge used to indicate that more content in this 2802 * view is available. Will not change whether the fading edge is enabled; use 2803 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2804 * to enable the fading edge for the vertical or horizontal fading edges. 2805 * 2806 * @param length The size in pixels of the faded edge used to indicate that more 2807 * content in this view is visible. 2808 */ 2809 public void setFadingEdgeLength(int length) { 2810 initScrollCache(); 2811 mScrollCache.fadingEdgeLength = length; 2812 } 2813 2814 /** 2815 * Returns the size of the horizontal faded edges used to indicate that more 2816 * content in this view is visible. 2817 * 2818 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2819 * faded edges are not enabled for this view. 2820 * @attr ref android.R.styleable#View_fadingEdgeLength 2821 */ 2822 public int getHorizontalFadingEdgeLength() { 2823 if (isHorizontalFadingEdgeEnabled()) { 2824 ScrollabilityCache cache = mScrollCache; 2825 if (cache != null) { 2826 return cache.fadingEdgeLength; 2827 } 2828 } 2829 return 0; 2830 } 2831 2832 /** 2833 * Returns the width of the vertical scrollbar. 2834 * 2835 * @return The width in pixels of the vertical scrollbar or 0 if there 2836 * is no vertical scrollbar. 2837 */ 2838 public int getVerticalScrollbarWidth() { 2839 ScrollabilityCache cache = mScrollCache; 2840 if (cache != null) { 2841 ScrollBarDrawable scrollBar = cache.scrollBar; 2842 if (scrollBar != null) { 2843 int size = scrollBar.getSize(true); 2844 if (size <= 0) { 2845 size = cache.scrollBarSize; 2846 } 2847 return size; 2848 } 2849 return 0; 2850 } 2851 return 0; 2852 } 2853 2854 /** 2855 * Returns the height of the horizontal scrollbar. 2856 * 2857 * @return The height in pixels of the horizontal scrollbar or 0 if 2858 * there is no horizontal scrollbar. 2859 */ 2860 protected int getHorizontalScrollbarHeight() { 2861 ScrollabilityCache cache = mScrollCache; 2862 if (cache != null) { 2863 ScrollBarDrawable scrollBar = cache.scrollBar; 2864 if (scrollBar != null) { 2865 int size = scrollBar.getSize(false); 2866 if (size <= 0) { 2867 size = cache.scrollBarSize; 2868 } 2869 return size; 2870 } 2871 return 0; 2872 } 2873 return 0; 2874 } 2875 2876 /** 2877 * <p> 2878 * Initializes the scrollbars from a given set of styled attributes. This 2879 * method should be called by subclasses that need scrollbars and when an 2880 * instance of these subclasses is created programmatically rather than 2881 * being inflated from XML. This method is automatically called when the XML 2882 * is inflated. 2883 * </p> 2884 * 2885 * @param a the styled attributes set to initialize the scrollbars from 2886 */ 2887 protected void initializeScrollbars(TypedArray a) { 2888 initScrollCache(); 2889 2890 final ScrollabilityCache scrollabilityCache = mScrollCache; 2891 2892 if (scrollabilityCache.scrollBar == null) { 2893 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2894 } 2895 2896 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2897 2898 if (!fadeScrollbars) { 2899 scrollabilityCache.state = ScrollabilityCache.ON; 2900 } 2901 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2902 2903 2904 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2905 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2906 .getScrollBarFadeDuration()); 2907 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2908 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2909 ViewConfiguration.getScrollDefaultDelay()); 2910 2911 2912 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2913 com.android.internal.R.styleable.View_scrollbarSize, 2914 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2915 2916 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2917 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2918 2919 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2920 if (thumb != null) { 2921 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2922 } 2923 2924 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2925 false); 2926 if (alwaysDraw) { 2927 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2928 } 2929 2930 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2931 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2932 2933 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2934 if (thumb != null) { 2935 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2936 } 2937 2938 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2939 false); 2940 if (alwaysDraw) { 2941 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2942 } 2943 2944 // Re-apply user/background padding so that scrollbar(s) get added 2945 recomputePadding(); 2946 } 2947 2948 /** 2949 * <p> 2950 * Initalizes the scrollability cache if necessary. 2951 * </p> 2952 */ 2953 private void initScrollCache() { 2954 if (mScrollCache == null) { 2955 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2956 } 2957 } 2958 2959 /** 2960 * Set the position of the vertical scroll bar. Should be one of 2961 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 2962 * {@link #SCROLLBAR_POSITION_RIGHT}. 2963 * 2964 * @param position Where the vertical scroll bar should be positioned. 2965 */ 2966 public void setVerticalScrollbarPosition(int position) { 2967 if (mVerticalScrollbarPosition != position) { 2968 mVerticalScrollbarPosition = position; 2969 computeOpaqueFlags(); 2970 recomputePadding(); 2971 } 2972 } 2973 2974 /** 2975 * @return The position where the vertical scroll bar will show, if applicable. 2976 * @see #setVerticalScrollbarPosition(int) 2977 */ 2978 public int getVerticalScrollbarPosition() { 2979 return mVerticalScrollbarPosition; 2980 } 2981 2982 /** 2983 * Register a callback to be invoked when focus of this view changed. 2984 * 2985 * @param l The callback that will run. 2986 */ 2987 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2988 mOnFocusChangeListener = l; 2989 } 2990 2991 /** 2992 * Add a listener that will be called when the bounds of the view change due to 2993 * layout processing. 2994 * 2995 * @param listener The listener that will be called when layout bounds change. 2996 */ 2997 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 2998 if (mOnLayoutChangeListeners == null) { 2999 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3000 } 3001 mOnLayoutChangeListeners.add(listener); 3002 } 3003 3004 /** 3005 * Remove a listener for layout changes. 3006 * 3007 * @param listener The listener for layout bounds change. 3008 */ 3009 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3010 if (mOnLayoutChangeListeners == null) { 3011 return; 3012 } 3013 mOnLayoutChangeListeners.remove(listener); 3014 } 3015 3016 /** 3017 * Add a listener for attach state changes. 3018 * 3019 * This listener will be called whenever this view is attached or detached 3020 * from a window. Remove the listener using 3021 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3022 * 3023 * @param listener Listener to attach 3024 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3025 */ 3026 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3027 if (mOnAttachStateChangeListeners == null) { 3028 mOnAttachStateChangeListeners = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3029 } 3030 mOnAttachStateChangeListeners.add(listener); 3031 } 3032 3033 /** 3034 * Remove a listener for attach state changes. The listener will receive no further 3035 * notification of window attach/detach events. 3036 * 3037 * @param listener Listener to remove 3038 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3039 */ 3040 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3041 if (mOnAttachStateChangeListeners == null) { 3042 return; 3043 } 3044 mOnAttachStateChangeListeners.remove(listener); 3045 } 3046 3047 /** 3048 * Returns the focus-change callback registered for this view. 3049 * 3050 * @return The callback, or null if one is not registered. 3051 */ 3052 public OnFocusChangeListener getOnFocusChangeListener() { 3053 return mOnFocusChangeListener; 3054 } 3055 3056 /** 3057 * Register a callback to be invoked when this view is clicked. If this view is not 3058 * clickable, it becomes clickable. 3059 * 3060 * @param l The callback that will run 3061 * 3062 * @see #setClickable(boolean) 3063 */ 3064 public void setOnClickListener(OnClickListener l) { 3065 if (!isClickable()) { 3066 setClickable(true); 3067 } 3068 mOnClickListener = l; 3069 } 3070 3071 /** 3072 * Register a callback to be invoked when this view is clicked and held. If this view is not 3073 * long clickable, it becomes long clickable. 3074 * 3075 * @param l The callback that will run 3076 * 3077 * @see #setLongClickable(boolean) 3078 */ 3079 public void setOnLongClickListener(OnLongClickListener l) { 3080 if (!isLongClickable()) { 3081 setLongClickable(true); 3082 } 3083 mOnLongClickListener = l; 3084 } 3085 3086 /** 3087 * Register a callback to be invoked when the context menu for this view is 3088 * being built. If this view is not long clickable, it becomes long clickable. 3089 * 3090 * @param l The callback that will run 3091 * 3092 */ 3093 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3094 if (!isLongClickable()) { 3095 setLongClickable(true); 3096 } 3097 mOnCreateContextMenuListener = l; 3098 } 3099 3100 /** 3101 * Call this view's OnClickListener, if it is defined. 3102 * 3103 * @return True there was an assigned OnClickListener that was called, false 3104 * otherwise is returned. 3105 */ 3106 public boolean performClick() { 3107 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3108 3109 if (mOnClickListener != null) { 3110 playSoundEffect(SoundEffectConstants.CLICK); 3111 mOnClickListener.onClick(this); 3112 return true; 3113 } 3114 3115 return false; 3116 } 3117 3118 /** 3119 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3120 * OnLongClickListener did not consume the event. 3121 * 3122 * @return True if one of the above receivers consumed the event, false otherwise. 3123 */ 3124 public boolean performLongClick() { 3125 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3126 3127 boolean handled = false; 3128 if (mOnLongClickListener != null) { 3129 handled = mOnLongClickListener.onLongClick(View.this); 3130 } 3131 if (!handled) { 3132 handled = showContextMenu(); 3133 } 3134 if (handled) { 3135 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3136 } 3137 return handled; 3138 } 3139 3140 /** 3141 * Bring up the context menu for this view. 3142 * 3143 * @return Whether a context menu was displayed. 3144 */ 3145 public boolean showContextMenu() { 3146 return getParent().showContextMenuForChild(this); 3147 } 3148 3149 /** 3150 * Start an action mode. 3151 * 3152 * @param callback Callback that will control the lifecycle of the action mode 3153 * @return The new action mode if it is started, null otherwise 3154 * 3155 * @see ActionMode 3156 */ 3157 public ActionMode startActionMode(ActionMode.Callback callback) { 3158 return getParent().startActionModeForChild(this, callback); 3159 } 3160 3161 /** 3162 * Register a callback to be invoked when a key is pressed in this view. 3163 * @param l the key listener to attach to this view 3164 */ 3165 public void setOnKeyListener(OnKeyListener l) { 3166 mOnKeyListener = l; 3167 } 3168 3169 /** 3170 * Register a callback to be invoked when a touch event is sent to this view. 3171 * @param l the touch listener to attach to this view 3172 */ 3173 public void setOnTouchListener(OnTouchListener l) { 3174 mOnTouchListener = l; 3175 } 3176 3177 /** 3178 * Register a callback to be invoked when a generic motion event is sent to this view. 3179 * @param l the generic motion listener to attach to this view 3180 */ 3181 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3182 mOnGenericMotionListener = l; 3183 } 3184 3185 /** 3186 * Register a drag event listener callback object for this View. The parameter is 3187 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3188 * View, the system calls the 3189 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3190 * @param l An implementation of {@link android.view.View.OnDragListener}. 3191 */ 3192 public void setOnDragListener(OnDragListener l) { 3193 mOnDragListener = l; 3194 } 3195 3196 /** 3197 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 3198 * 3199 * Note: this does not check whether this {@link View} should get focus, it just 3200 * gives it focus no matter what. It should only be called internally by framework 3201 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3202 * 3203 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3204 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3205 * focus moved when requestFocus() is called. It may not always 3206 * apply, in which case use the default View.FOCUS_DOWN. 3207 * @param previouslyFocusedRect The rectangle of the view that had focus 3208 * prior in this View's coordinate system. 3209 */ 3210 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3211 if (DBG) { 3212 System.out.println(this + " requestFocus()"); 3213 } 3214 3215 if ((mPrivateFlags & FOCUSED) == 0) { 3216 mPrivateFlags |= FOCUSED; 3217 3218 if (mParent != null) { 3219 mParent.requestChildFocus(this, this); 3220 } 3221 3222 onFocusChanged(true, direction, previouslyFocusedRect); 3223 refreshDrawableState(); 3224 } 3225 } 3226 3227 /** 3228 * Request that a rectangle of this view be visible on the screen, 3229 * scrolling if necessary just enough. 3230 * 3231 * <p>A View should call this if it maintains some notion of which part 3232 * of its content is interesting. For example, a text editing view 3233 * should call this when its cursor moves. 3234 * 3235 * @param rectangle The rectangle. 3236 * @return Whether any parent scrolled. 3237 */ 3238 public boolean requestRectangleOnScreen(Rect rectangle) { 3239 return requestRectangleOnScreen(rectangle, false); 3240 } 3241 3242 /** 3243 * Request that a rectangle of this view be visible on the screen, 3244 * scrolling if necessary just enough. 3245 * 3246 * <p>A View should call this if it maintains some notion of which part 3247 * of its content is interesting. For example, a text editing view 3248 * should call this when its cursor moves. 3249 * 3250 * <p>When <code>immediate</code> is set to true, scrolling will not be 3251 * animated. 3252 * 3253 * @param rectangle The rectangle. 3254 * @param immediate True to forbid animated scrolling, false otherwise 3255 * @return Whether any parent scrolled. 3256 */ 3257 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3258 View child = this; 3259 ViewParent parent = mParent; 3260 boolean scrolled = false; 3261 while (parent != null) { 3262 scrolled |= parent.requestChildRectangleOnScreen(child, 3263 rectangle, immediate); 3264 3265 // offset rect so next call has the rectangle in the 3266 // coordinate system of its direct child. 3267 rectangle.offset(child.getLeft(), child.getTop()); 3268 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3269 3270 if (!(parent instanceof View)) { 3271 break; 3272 } 3273 3274 child = (View) parent; 3275 parent = child.getParent(); 3276 } 3277 return scrolled; 3278 } 3279 3280 /** 3281 * Called when this view wants to give up focus. This will cause 3282 * {@link #onFocusChanged} to be called. 3283 */ 3284 public void clearFocus() { 3285 if (DBG) { 3286 System.out.println(this + " clearFocus()"); 3287 } 3288 3289 if ((mPrivateFlags & FOCUSED) != 0) { 3290 mPrivateFlags &= ~FOCUSED; 3291 3292 if (mParent != null) { 3293 mParent.clearChildFocus(this); 3294 } 3295 3296 onFocusChanged(false, 0, null); 3297 refreshDrawableState(); 3298 } 3299 } 3300 3301 /** 3302 * Called to clear the focus of a view that is about to be removed. 3303 * Doesn't call clearChildFocus, which prevents this view from taking 3304 * focus again before it has been removed from the parent 3305 */ 3306 void clearFocusForRemoval() { 3307 if ((mPrivateFlags & FOCUSED) != 0) { 3308 mPrivateFlags &= ~FOCUSED; 3309 3310 onFocusChanged(false, 0, null); 3311 refreshDrawableState(); 3312 } 3313 } 3314 3315 /** 3316 * Called internally by the view system when a new view is getting focus. 3317 * This is what clears the old focus. 3318 */ 3319 void unFocus() { 3320 if (DBG) { 3321 System.out.println(this + " unFocus()"); 3322 } 3323 3324 if ((mPrivateFlags & FOCUSED) != 0) { 3325 mPrivateFlags &= ~FOCUSED; 3326 3327 onFocusChanged(false, 0, null); 3328 refreshDrawableState(); 3329 } 3330 } 3331 3332 /** 3333 * Returns true if this view has focus iteself, or is the ancestor of the 3334 * view that has focus. 3335 * 3336 * @return True if this view has or contains focus, false otherwise. 3337 */ 3338 @ViewDebug.ExportedProperty(category = "focus") 3339 public boolean hasFocus() { 3340 return (mPrivateFlags & FOCUSED) != 0; 3341 } 3342 3343 /** 3344 * Returns true if this view is focusable or if it contains a reachable View 3345 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3346 * is a View whose parents do not block descendants focus. 3347 * 3348 * Only {@link #VISIBLE} views are considered focusable. 3349 * 3350 * @return True if the view is focusable or if the view contains a focusable 3351 * View, false otherwise. 3352 * 3353 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3354 */ 3355 public boolean hasFocusable() { 3356 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3357 } 3358 3359 /** 3360 * Called by the view system when the focus state of this view changes. 3361 * When the focus change event is caused by directional navigation, direction 3362 * and previouslyFocusedRect provide insight into where the focus is coming from. 3363 * When overriding, be sure to call up through to the super class so that 3364 * the standard focus handling will occur. 3365 * 3366 * @param gainFocus True if the View has focus; false otherwise. 3367 * @param direction The direction focus has moved when requestFocus() 3368 * is called to give this view focus. Values are 3369 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3370 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3371 * It may not always apply, in which case use the default. 3372 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3373 * system, of the previously focused view. If applicable, this will be 3374 * passed in as finer grained information about where the focus is coming 3375 * from (in addition to direction). Will be <code>null</code> otherwise. 3376 */ 3377 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3378 if (gainFocus) { 3379 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3380 } 3381 3382 InputMethodManager imm = InputMethodManager.peekInstance(); 3383 if (!gainFocus) { 3384 if (isPressed()) { 3385 setPressed(false); 3386 } 3387 if (imm != null && mAttachInfo != null 3388 && mAttachInfo.mHasWindowFocus) { 3389 imm.focusOut(this); 3390 } 3391 onFocusLost(); 3392 } else if (imm != null && mAttachInfo != null 3393 && mAttachInfo.mHasWindowFocus) { 3394 imm.focusIn(this); 3395 } 3396 3397 invalidate(true); 3398 if (mOnFocusChangeListener != null) { 3399 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3400 } 3401 3402 if (mAttachInfo != null) { 3403 mAttachInfo.mKeyDispatchState.reset(this); 3404 } 3405 } 3406 3407 /** 3408 * {@inheritDoc} 3409 */ 3410 public void sendAccessibilityEvent(int eventType) { 3411 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3412 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3413 } 3414 } 3415 3416 /** 3417 * {@inheritDoc} 3418 */ 3419 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3420 if (!isShown()) { 3421 return; 3422 } 3423 event.setClassName(getClass().getName()); 3424 event.setPackageName(getContext().getPackageName()); 3425 event.setEnabled(isEnabled()); 3426 event.setContentDescription(mContentDescription); 3427 3428 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3429 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3430 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3431 event.setItemCount(focusablesTempList.size()); 3432 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3433 focusablesTempList.clear(); 3434 } 3435 3436 dispatchPopulateAccessibilityEvent(event); 3437 3438 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 3439 } 3440 3441 /** 3442 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 3443 * to be populated. 3444 * 3445 * @param event The event. 3446 * 3447 * @return True if the event population was completed. 3448 */ 3449 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3450 return false; 3451 } 3452 3453 /** 3454 * Gets the {@link View} description. It briefly describes the view and is 3455 * primarily used for accessibility support. Set this property to enable 3456 * better accessibility support for your application. This is especially 3457 * true for views that do not have textual representation (For example, 3458 * ImageButton). 3459 * 3460 * @return The content descriptiopn. 3461 * 3462 * @attr ref android.R.styleable#View_contentDescription 3463 */ 3464 public CharSequence getContentDescription() { 3465 return mContentDescription; 3466 } 3467 3468 /** 3469 * Sets the {@link View} description. It briefly describes the view and is 3470 * primarily used for accessibility support. Set this property to enable 3471 * better accessibility support for your application. This is especially 3472 * true for views that do not have textual representation (For example, 3473 * ImageButton). 3474 * 3475 * @param contentDescription The content description. 3476 * 3477 * @attr ref android.R.styleable#View_contentDescription 3478 */ 3479 public void setContentDescription(CharSequence contentDescription) { 3480 mContentDescription = contentDescription; 3481 } 3482 3483 /** 3484 * Invoked whenever this view loses focus, either by losing window focus or by losing 3485 * focus within its window. This method can be used to clear any state tied to the 3486 * focus. For instance, if a button is held pressed with the trackball and the window 3487 * loses focus, this method can be used to cancel the press. 3488 * 3489 * Subclasses of View overriding this method should always call super.onFocusLost(). 3490 * 3491 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3492 * @see #onWindowFocusChanged(boolean) 3493 * 3494 * @hide pending API council approval 3495 */ 3496 protected void onFocusLost() { 3497 resetPressedState(); 3498 } 3499 3500 private void resetPressedState() { 3501 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3502 return; 3503 } 3504 3505 if (isPressed()) { 3506 setPressed(false); 3507 3508 if (!mHasPerformedLongPress) { 3509 removeLongPressCallback(); 3510 } 3511 } 3512 } 3513 3514 /** 3515 * Returns true if this view has focus 3516 * 3517 * @return True if this view has focus, false otherwise. 3518 */ 3519 @ViewDebug.ExportedProperty(category = "focus") 3520 public boolean isFocused() { 3521 return (mPrivateFlags & FOCUSED) != 0; 3522 } 3523 3524 /** 3525 * Find the view in the hierarchy rooted at this view that currently has 3526 * focus. 3527 * 3528 * @return The view that currently has focus, or null if no focused view can 3529 * be found. 3530 */ 3531 public View findFocus() { 3532 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3533 } 3534 3535 /** 3536 * Change whether this view is one of the set of scrollable containers in 3537 * its window. This will be used to determine whether the window can 3538 * resize or must pan when a soft input area is open -- scrollable 3539 * containers allow the window to use resize mode since the container 3540 * will appropriately shrink. 3541 */ 3542 public void setScrollContainer(boolean isScrollContainer) { 3543 if (isScrollContainer) { 3544 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3545 mAttachInfo.mScrollContainers.add(this); 3546 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3547 } 3548 mPrivateFlags |= SCROLL_CONTAINER; 3549 } else { 3550 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3551 mAttachInfo.mScrollContainers.remove(this); 3552 } 3553 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3554 } 3555 } 3556 3557 /** 3558 * Returns the quality of the drawing cache. 3559 * 3560 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3561 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3562 * 3563 * @see #setDrawingCacheQuality(int) 3564 * @see #setDrawingCacheEnabled(boolean) 3565 * @see #isDrawingCacheEnabled() 3566 * 3567 * @attr ref android.R.styleable#View_drawingCacheQuality 3568 */ 3569 public int getDrawingCacheQuality() { 3570 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3571 } 3572 3573 /** 3574 * Set the drawing cache quality of this view. This value is used only when the 3575 * drawing cache is enabled 3576 * 3577 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3578 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3579 * 3580 * @see #getDrawingCacheQuality() 3581 * @see #setDrawingCacheEnabled(boolean) 3582 * @see #isDrawingCacheEnabled() 3583 * 3584 * @attr ref android.R.styleable#View_drawingCacheQuality 3585 */ 3586 public void setDrawingCacheQuality(int quality) { 3587 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3588 } 3589 3590 /** 3591 * Returns whether the screen should remain on, corresponding to the current 3592 * value of {@link #KEEP_SCREEN_ON}. 3593 * 3594 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3595 * 3596 * @see #setKeepScreenOn(boolean) 3597 * 3598 * @attr ref android.R.styleable#View_keepScreenOn 3599 */ 3600 public boolean getKeepScreenOn() { 3601 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3602 } 3603 3604 /** 3605 * Controls whether the screen should remain on, modifying the 3606 * value of {@link #KEEP_SCREEN_ON}. 3607 * 3608 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3609 * 3610 * @see #getKeepScreenOn() 3611 * 3612 * @attr ref android.R.styleable#View_keepScreenOn 3613 */ 3614 public void setKeepScreenOn(boolean keepScreenOn) { 3615 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3616 } 3617 3618 /** 3619 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3620 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3621 * 3622 * @attr ref android.R.styleable#View_nextFocusLeft 3623 */ 3624 public int getNextFocusLeftId() { 3625 return mNextFocusLeftId; 3626 } 3627 3628 /** 3629 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3630 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3631 * decide automatically. 3632 * 3633 * @attr ref android.R.styleable#View_nextFocusLeft 3634 */ 3635 public void setNextFocusLeftId(int nextFocusLeftId) { 3636 mNextFocusLeftId = nextFocusLeftId; 3637 } 3638 3639 /** 3640 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3641 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3642 * 3643 * @attr ref android.R.styleable#View_nextFocusRight 3644 */ 3645 public int getNextFocusRightId() { 3646 return mNextFocusRightId; 3647 } 3648 3649 /** 3650 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3651 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3652 * decide automatically. 3653 * 3654 * @attr ref android.R.styleable#View_nextFocusRight 3655 */ 3656 public void setNextFocusRightId(int nextFocusRightId) { 3657 mNextFocusRightId = nextFocusRightId; 3658 } 3659 3660 /** 3661 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3662 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3663 * 3664 * @attr ref android.R.styleable#View_nextFocusUp 3665 */ 3666 public int getNextFocusUpId() { 3667 return mNextFocusUpId; 3668 } 3669 3670 /** 3671 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3672 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 3673 * decide automatically. 3674 * 3675 * @attr ref android.R.styleable#View_nextFocusUp 3676 */ 3677 public void setNextFocusUpId(int nextFocusUpId) { 3678 mNextFocusUpId = nextFocusUpId; 3679 } 3680 3681 /** 3682 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3683 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3684 * 3685 * @attr ref android.R.styleable#View_nextFocusDown 3686 */ 3687 public int getNextFocusDownId() { 3688 return mNextFocusDownId; 3689 } 3690 3691 /** 3692 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3693 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 3694 * decide automatically. 3695 * 3696 * @attr ref android.R.styleable#View_nextFocusDown 3697 */ 3698 public void setNextFocusDownId(int nextFocusDownId) { 3699 mNextFocusDownId = nextFocusDownId; 3700 } 3701 3702 /** 3703 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3704 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3705 * 3706 * @attr ref android.R.styleable#View_nextFocusForward 3707 */ 3708 public int getNextFocusForwardId() { 3709 return mNextFocusForwardId; 3710 } 3711 3712 /** 3713 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3714 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 3715 * decide automatically. 3716 * 3717 * @attr ref android.R.styleable#View_nextFocusForward 3718 */ 3719 public void setNextFocusForwardId(int nextFocusForwardId) { 3720 mNextFocusForwardId = nextFocusForwardId; 3721 } 3722 3723 /** 3724 * Returns the visibility of this view and all of its ancestors 3725 * 3726 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3727 */ 3728 public boolean isShown() { 3729 View current = this; 3730 //noinspection ConstantConditions 3731 do { 3732 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3733 return false; 3734 } 3735 ViewParent parent = current.mParent; 3736 if (parent == null) { 3737 return false; // We are not attached to the view root 3738 } 3739 if (!(parent instanceof View)) { 3740 return true; 3741 } 3742 current = (View) parent; 3743 } while (current != null); 3744 3745 return false; 3746 } 3747 3748 /** 3749 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3750 * is set 3751 * 3752 * @param insets Insets for system windows 3753 * 3754 * @return True if this view applied the insets, false otherwise 3755 */ 3756 protected boolean fitSystemWindows(Rect insets) { 3757 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3758 mPaddingLeft = insets.left; 3759 mPaddingTop = insets.top; 3760 mPaddingRight = insets.right; 3761 mPaddingBottom = insets.bottom; 3762 requestLayout(); 3763 return true; 3764 } 3765 return false; 3766 } 3767 3768 /** 3769 * Returns the visibility status for this view. 3770 * 3771 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3772 * @attr ref android.R.styleable#View_visibility 3773 */ 3774 @ViewDebug.ExportedProperty(mapping = { 3775 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3776 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3777 @ViewDebug.IntToString(from = GONE, to = "GONE") 3778 }) 3779 public int getVisibility() { 3780 return mViewFlags & VISIBILITY_MASK; 3781 } 3782 3783 /** 3784 * Set the enabled state of this view. 3785 * 3786 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3787 * @attr ref android.R.styleable#View_visibility 3788 */ 3789 @RemotableViewMethod 3790 public void setVisibility(int visibility) { 3791 setFlags(visibility, VISIBILITY_MASK); 3792 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3793 } 3794 3795 /** 3796 * Returns the enabled status for this view. The interpretation of the 3797 * enabled state varies by subclass. 3798 * 3799 * @return True if this view is enabled, false otherwise. 3800 */ 3801 @ViewDebug.ExportedProperty 3802 public boolean isEnabled() { 3803 return (mViewFlags & ENABLED_MASK) == ENABLED; 3804 } 3805 3806 /** 3807 * Set the enabled state of this view. The interpretation of the enabled 3808 * state varies by subclass. 3809 * 3810 * @param enabled True if this view is enabled, false otherwise. 3811 */ 3812 @RemotableViewMethod 3813 public void setEnabled(boolean enabled) { 3814 if (enabled == isEnabled()) return; 3815 3816 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3817 3818 /* 3819 * The View most likely has to change its appearance, so refresh 3820 * the drawable state. 3821 */ 3822 refreshDrawableState(); 3823 3824 // Invalidate too, since the default behavior for views is to be 3825 // be drawn at 50% alpha rather than to change the drawable. 3826 invalidate(true); 3827 } 3828 3829 /** 3830 * Set whether this view can receive the focus. 3831 * 3832 * Setting this to false will also ensure that this view is not focusable 3833 * in touch mode. 3834 * 3835 * @param focusable If true, this view can receive the focus. 3836 * 3837 * @see #setFocusableInTouchMode(boolean) 3838 * @attr ref android.R.styleable#View_focusable 3839 */ 3840 public void setFocusable(boolean focusable) { 3841 if (!focusable) { 3842 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3843 } 3844 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3845 } 3846 3847 /** 3848 * Set whether this view can receive focus while in touch mode. 3849 * 3850 * Setting this to true will also ensure that this view is focusable. 3851 * 3852 * @param focusableInTouchMode If true, this view can receive the focus while 3853 * in touch mode. 3854 * 3855 * @see #setFocusable(boolean) 3856 * @attr ref android.R.styleable#View_focusableInTouchMode 3857 */ 3858 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3859 // Focusable in touch mode should always be set before the focusable flag 3860 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3861 // which, in touch mode, will not successfully request focus on this view 3862 // because the focusable in touch mode flag is not set 3863 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3864 if (focusableInTouchMode) { 3865 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3866 } 3867 } 3868 3869 /** 3870 * Set whether this view should have sound effects enabled for events such as 3871 * clicking and touching. 3872 * 3873 * <p>You may wish to disable sound effects for a view if you already play sounds, 3874 * for instance, a dial key that plays dtmf tones. 3875 * 3876 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3877 * @see #isSoundEffectsEnabled() 3878 * @see #playSoundEffect(int) 3879 * @attr ref android.R.styleable#View_soundEffectsEnabled 3880 */ 3881 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3882 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3883 } 3884 3885 /** 3886 * @return whether this view should have sound effects enabled for events such as 3887 * clicking and touching. 3888 * 3889 * @see #setSoundEffectsEnabled(boolean) 3890 * @see #playSoundEffect(int) 3891 * @attr ref android.R.styleable#View_soundEffectsEnabled 3892 */ 3893 @ViewDebug.ExportedProperty 3894 public boolean isSoundEffectsEnabled() { 3895 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3896 } 3897 3898 /** 3899 * Set whether this view should have haptic feedback for events such as 3900 * long presses. 3901 * 3902 * <p>You may wish to disable haptic feedback if your view already controls 3903 * its own haptic feedback. 3904 * 3905 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3906 * @see #isHapticFeedbackEnabled() 3907 * @see #performHapticFeedback(int) 3908 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3909 */ 3910 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3911 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3912 } 3913 3914 /** 3915 * @return whether this view should have haptic feedback enabled for events 3916 * long presses. 3917 * 3918 * @see #setHapticFeedbackEnabled(boolean) 3919 * @see #performHapticFeedback(int) 3920 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3921 */ 3922 @ViewDebug.ExportedProperty 3923 public boolean isHapticFeedbackEnabled() { 3924 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3925 } 3926 3927 /** 3928 * If this view doesn't do any drawing on its own, set this flag to 3929 * allow further optimizations. By default, this flag is not set on 3930 * View, but could be set on some View subclasses such as ViewGroup. 3931 * 3932 * Typically, if you override {@link #onDraw} you should clear this flag. 3933 * 3934 * @param willNotDraw whether or not this View draw on its own 3935 */ 3936 public void setWillNotDraw(boolean willNotDraw) { 3937 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3938 } 3939 3940 /** 3941 * Returns whether or not this View draws on its own. 3942 * 3943 * @return true if this view has nothing to draw, false otherwise 3944 */ 3945 @ViewDebug.ExportedProperty(category = "drawing") 3946 public boolean willNotDraw() { 3947 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3948 } 3949 3950 /** 3951 * When a View's drawing cache is enabled, drawing is redirected to an 3952 * offscreen bitmap. Some views, like an ImageView, must be able to 3953 * bypass this mechanism if they already draw a single bitmap, to avoid 3954 * unnecessary usage of the memory. 3955 * 3956 * @param willNotCacheDrawing true if this view does not cache its 3957 * drawing, false otherwise 3958 */ 3959 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3960 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3961 } 3962 3963 /** 3964 * Returns whether or not this View can cache its drawing or not. 3965 * 3966 * @return true if this view does not cache its drawing, false otherwise 3967 */ 3968 @ViewDebug.ExportedProperty(category = "drawing") 3969 public boolean willNotCacheDrawing() { 3970 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3971 } 3972 3973 /** 3974 * Indicates whether this view reacts to click events or not. 3975 * 3976 * @return true if the view is clickable, false otherwise 3977 * 3978 * @see #setClickable(boolean) 3979 * @attr ref android.R.styleable#View_clickable 3980 */ 3981 @ViewDebug.ExportedProperty 3982 public boolean isClickable() { 3983 return (mViewFlags & CLICKABLE) == CLICKABLE; 3984 } 3985 3986 /** 3987 * Enables or disables click events for this view. When a view 3988 * is clickable it will change its state to "pressed" on every click. 3989 * Subclasses should set the view clickable to visually react to 3990 * user's clicks. 3991 * 3992 * @param clickable true to make the view clickable, false otherwise 3993 * 3994 * @see #isClickable() 3995 * @attr ref android.R.styleable#View_clickable 3996 */ 3997 public void setClickable(boolean clickable) { 3998 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3999 } 4000 4001 /** 4002 * Indicates whether this view reacts to long click events or not. 4003 * 4004 * @return true if the view is long clickable, false otherwise 4005 * 4006 * @see #setLongClickable(boolean) 4007 * @attr ref android.R.styleable#View_longClickable 4008 */ 4009 public boolean isLongClickable() { 4010 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4011 } 4012 4013 /** 4014 * Enables or disables long click events for this view. When a view is long 4015 * clickable it reacts to the user holding down the button for a longer 4016 * duration than a tap. This event can either launch the listener or a 4017 * context menu. 4018 * 4019 * @param longClickable true to make the view long clickable, false otherwise 4020 * @see #isLongClickable() 4021 * @attr ref android.R.styleable#View_longClickable 4022 */ 4023 public void setLongClickable(boolean longClickable) { 4024 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4025 } 4026 4027 /** 4028 * Sets the pressed state for this view. 4029 * 4030 * @see #isClickable() 4031 * @see #setClickable(boolean) 4032 * 4033 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4034 * the View's internal state from a previously set "pressed" state. 4035 */ 4036 public void setPressed(boolean pressed) { 4037 if (pressed) { 4038 mPrivateFlags |= PRESSED; 4039 } else { 4040 mPrivateFlags &= ~PRESSED; 4041 } 4042 refreshDrawableState(); 4043 dispatchSetPressed(pressed); 4044 } 4045 4046 /** 4047 * Dispatch setPressed to all of this View's children. 4048 * 4049 * @see #setPressed(boolean) 4050 * 4051 * @param pressed The new pressed state 4052 */ 4053 protected void dispatchSetPressed(boolean pressed) { 4054 } 4055 4056 /** 4057 * Indicates whether the view is currently in pressed state. Unless 4058 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 4059 * the pressed state. 4060 * 4061 * @see #setPressed 4062 * @see #isClickable() 4063 * @see #setClickable(boolean) 4064 * 4065 * @return true if the view is currently pressed, false otherwise 4066 */ 4067 public boolean isPressed() { 4068 return (mPrivateFlags & PRESSED) == PRESSED; 4069 } 4070 4071 /** 4072 * Indicates whether this view will save its state (that is, 4073 * whether its {@link #onSaveInstanceState} method will be called). 4074 * 4075 * @return Returns true if the view state saving is enabled, else false. 4076 * 4077 * @see #setSaveEnabled(boolean) 4078 * @attr ref android.R.styleable#View_saveEnabled 4079 */ 4080 public boolean isSaveEnabled() { 4081 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 4082 } 4083 4084 /** 4085 * Controls whether the saving of this view's state is 4086 * enabled (that is, whether its {@link #onSaveInstanceState} method 4087 * will be called). Note that even if freezing is enabled, the 4088 * view still must have an id assigned to it (via {@link #setId setId()}) 4089 * for its state to be saved. This flag can only disable the 4090 * saving of this view; any child views may still have their state saved. 4091 * 4092 * @param enabled Set to false to <em>disable</em> state saving, or true 4093 * (the default) to allow it. 4094 * 4095 * @see #isSaveEnabled() 4096 * @see #setId(int) 4097 * @see #onSaveInstanceState() 4098 * @attr ref android.R.styleable#View_saveEnabled 4099 */ 4100 public void setSaveEnabled(boolean enabled) { 4101 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 4102 } 4103 4104 /** 4105 * Gets whether the framework should discard touches when the view's 4106 * window is obscured by another visible window. 4107 * Refer to the {@link View} security documentation for more details. 4108 * 4109 * @return True if touch filtering is enabled. 4110 * 4111 * @see #setFilterTouchesWhenObscured(boolean) 4112 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4113 */ 4114 @ViewDebug.ExportedProperty 4115 public boolean getFilterTouchesWhenObscured() { 4116 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4117 } 4118 4119 /** 4120 * Sets whether the framework should discard touches when the view's 4121 * window is obscured by another visible window. 4122 * Refer to the {@link View} security documentation for more details. 4123 * 4124 * @param enabled True if touch filtering should be enabled. 4125 * 4126 * @see #getFilterTouchesWhenObscured 4127 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4128 */ 4129 public void setFilterTouchesWhenObscured(boolean enabled) { 4130 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4131 FILTER_TOUCHES_WHEN_OBSCURED); 4132 } 4133 4134 /** 4135 * Indicates whether the entire hierarchy under this view will save its 4136 * state when a state saving traversal occurs from its parent. The default 4137 * is true; if false, these views will not be saved unless 4138 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4139 * 4140 * @return Returns true if the view state saving from parent is enabled, else false. 4141 * 4142 * @see #setSaveFromParentEnabled(boolean) 4143 */ 4144 public boolean isSaveFromParentEnabled() { 4145 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4146 } 4147 4148 /** 4149 * Controls whether the entire hierarchy under this view will save its 4150 * state when a state saving traversal occurs from its parent. The default 4151 * is true; if false, these views will not be saved unless 4152 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4153 * 4154 * @param enabled Set to false to <em>disable</em> state saving, or true 4155 * (the default) to allow it. 4156 * 4157 * @see #isSaveFromParentEnabled() 4158 * @see #setId(int) 4159 * @see #onSaveInstanceState() 4160 */ 4161 public void setSaveFromParentEnabled(boolean enabled) { 4162 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4163 } 4164 4165 4166 /** 4167 * Returns whether this View is able to take focus. 4168 * 4169 * @return True if this view can take focus, or false otherwise. 4170 * @attr ref android.R.styleable#View_focusable 4171 */ 4172 @ViewDebug.ExportedProperty(category = "focus") 4173 public final boolean isFocusable() { 4174 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4175 } 4176 4177 /** 4178 * When a view is focusable, it may not want to take focus when in touch mode. 4179 * For example, a button would like focus when the user is navigating via a D-pad 4180 * so that the user can click on it, but once the user starts touching the screen, 4181 * the button shouldn't take focus 4182 * @return Whether the view is focusable in touch mode. 4183 * @attr ref android.R.styleable#View_focusableInTouchMode 4184 */ 4185 @ViewDebug.ExportedProperty 4186 public final boolean isFocusableInTouchMode() { 4187 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4188 } 4189 4190 /** 4191 * Find the nearest view in the specified direction that can take focus. 4192 * This does not actually give focus to that view. 4193 * 4194 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4195 * 4196 * @return The nearest focusable in the specified direction, or null if none 4197 * can be found. 4198 */ 4199 public View focusSearch(int direction) { 4200 if (mParent != null) { 4201 return mParent.focusSearch(this, direction); 4202 } else { 4203 return null; 4204 } 4205 } 4206 4207 /** 4208 * This method is the last chance for the focused view and its ancestors to 4209 * respond to an arrow key. This is called when the focused view did not 4210 * consume the key internally, nor could the view system find a new view in 4211 * the requested direction to give focus to. 4212 * 4213 * @param focused The currently focused view. 4214 * @param direction The direction focus wants to move. One of FOCUS_UP, 4215 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4216 * @return True if the this view consumed this unhandled move. 4217 */ 4218 public boolean dispatchUnhandledMove(View focused, int direction) { 4219 return false; 4220 } 4221 4222 /** 4223 * If a user manually specified the next view id for a particular direction, 4224 * use the root to look up the view. 4225 * @param root The root view of the hierarchy containing this view. 4226 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4227 * or FOCUS_BACKWARD. 4228 * @return The user specified next view, or null if there is none. 4229 */ 4230 View findUserSetNextFocus(View root, int direction) { 4231 switch (direction) { 4232 case FOCUS_LEFT: 4233 if (mNextFocusLeftId == View.NO_ID) return null; 4234 return findViewShouldExist(root, mNextFocusLeftId); 4235 case FOCUS_RIGHT: 4236 if (mNextFocusRightId == View.NO_ID) return null; 4237 return findViewShouldExist(root, mNextFocusRightId); 4238 case FOCUS_UP: 4239 if (mNextFocusUpId == View.NO_ID) return null; 4240 return findViewShouldExist(root, mNextFocusUpId); 4241 case FOCUS_DOWN: 4242 if (mNextFocusDownId == View.NO_ID) return null; 4243 return findViewShouldExist(root, mNextFocusDownId); 4244 case FOCUS_FORWARD: 4245 if (mNextFocusForwardId == View.NO_ID) return null; 4246 return findViewShouldExist(root, mNextFocusForwardId); 4247 case FOCUS_BACKWARD: { 4248 final int id = mID; 4249 return root.findViewByPredicate(new Predicate<View>() { 4250 @Override 4251 public boolean apply(View t) { 4252 return t.mNextFocusForwardId == id; 4253 } 4254 }); 4255 } 4256 } 4257 return null; 4258 } 4259 4260 private static View findViewShouldExist(View root, int childViewId) { 4261 View result = root.findViewById(childViewId); 4262 if (result == null) { 4263 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4264 + "by user for id " + childViewId); 4265 } 4266 return result; 4267 } 4268 4269 /** 4270 * Find and return all focusable views that are descendants of this view, 4271 * possibly including this view if it is focusable itself. 4272 * 4273 * @param direction The direction of the focus 4274 * @return A list of focusable views 4275 */ 4276 public ArrayList<View> getFocusables(int direction) { 4277 ArrayList<View> result = new ArrayList<View>(24); 4278 addFocusables(result, direction); 4279 return result; 4280 } 4281 4282 /** 4283 * Add any focusable views that are descendants of this view (possibly 4284 * including this view if it is focusable itself) to views. If we are in touch mode, 4285 * only add views that are also focusable in touch mode. 4286 * 4287 * @param views Focusable views found so far 4288 * @param direction The direction of the focus 4289 */ 4290 public void addFocusables(ArrayList<View> views, int direction) { 4291 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4292 } 4293 4294 /** 4295 * Adds any focusable views that are descendants of this view (possibly 4296 * including this view if it is focusable itself) to views. This method 4297 * adds all focusable views regardless if we are in touch mode or 4298 * only views focusable in touch mode if we are in touch mode depending on 4299 * the focusable mode paramater. 4300 * 4301 * @param views Focusable views found so far or null if all we are interested is 4302 * the number of focusables. 4303 * @param direction The direction of the focus. 4304 * @param focusableMode The type of focusables to be added. 4305 * 4306 * @see #FOCUSABLES_ALL 4307 * @see #FOCUSABLES_TOUCH_MODE 4308 */ 4309 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4310 if (!isFocusable()) { 4311 return; 4312 } 4313 4314 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4315 isInTouchMode() && !isFocusableInTouchMode()) { 4316 return; 4317 } 4318 4319 if (views != null) { 4320 views.add(this); 4321 } 4322 } 4323 4324 /** 4325 * Find and return all touchable views that are descendants of this view, 4326 * possibly including this view if it is touchable itself. 4327 * 4328 * @return A list of touchable views 4329 */ 4330 public ArrayList<View> getTouchables() { 4331 ArrayList<View> result = new ArrayList<View>(); 4332 addTouchables(result); 4333 return result; 4334 } 4335 4336 /** 4337 * Add any touchable views that are descendants of this view (possibly 4338 * including this view if it is touchable itself) to views. 4339 * 4340 * @param views Touchable views found so far 4341 */ 4342 public void addTouchables(ArrayList<View> views) { 4343 final int viewFlags = mViewFlags; 4344 4345 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4346 && (viewFlags & ENABLED_MASK) == ENABLED) { 4347 views.add(this); 4348 } 4349 } 4350 4351 /** 4352 * Call this to try to give focus to a specific view or to one of its 4353 * descendants. 4354 * 4355 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 4356 * false), or if it is focusable and it is not focusable in touch mode 4357 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 4358 * 4359 * See also {@link #focusSearch}, which is what you call to say that you 4360 * have focus, and you want your parent to look for the next one. 4361 * 4362 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4363 * {@link #FOCUS_DOWN} and <code>null</code>. 4364 * 4365 * @return Whether this view or one of its descendants actually took focus. 4366 */ 4367 public final boolean requestFocus() { 4368 return requestFocus(View.FOCUS_DOWN); 4369 } 4370 4371 4372 /** 4373 * Call this to try to give focus to a specific view or to one of its 4374 * descendants and give it a hint about what direction focus is heading. 4375 * 4376 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 4377 * false), or if it is focusable and it is not focusable in touch mode 4378 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 4379 * 4380 * See also {@link #focusSearch}, which is what you call to say that you 4381 * have focus, and you want your parent to look for the next one. 4382 * 4383 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4384 * <code>null</code> set for the previously focused rectangle. 4385 * 4386 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4387 * @return Whether this view or one of its descendants actually took focus. 4388 */ 4389 public final boolean requestFocus(int direction) { 4390 return requestFocus(direction, null); 4391 } 4392 4393 /** 4394 * Call this to try to give focus to a specific view or to one of its descendants 4395 * and give it hints about the direction and a specific rectangle that the focus 4396 * is coming from. The rectangle can help give larger views a finer grained hint 4397 * about where focus is coming from, and therefore, where to show selection, or 4398 * forward focus change internally. 4399 * 4400 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 4401 * false), or if it is focusable and it is not focusable in touch mode 4402 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 4403 * 4404 * A View will not take focus if it is not visible. 4405 * 4406 * A View will not take focus if one of its parents has 4407 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 4408 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4409 * 4410 * See also {@link #focusSearch}, which is what you call to say that you 4411 * have focus, and you want your parent to look for the next one. 4412 * 4413 * You may wish to override this method if your custom {@link View} has an internal 4414 * {@link View} that it wishes to forward the request to. 4415 * 4416 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4417 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4418 * to give a finer grained hint about where focus is coming from. May be null 4419 * if there is no hint. 4420 * @return Whether this view or one of its descendants actually took focus. 4421 */ 4422 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4423 // need to be focusable 4424 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4425 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4426 return false; 4427 } 4428 4429 // need to be focusable in touch mode if in touch mode 4430 if (isInTouchMode() && 4431 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4432 return false; 4433 } 4434 4435 // need to not have any parents blocking us 4436 if (hasAncestorThatBlocksDescendantFocus()) { 4437 return false; 4438 } 4439 4440 handleFocusGainInternal(direction, previouslyFocusedRect); 4441 return true; 4442 } 4443 4444 /** Gets the ViewRoot, or null if not attached. */ 4445 /*package*/ ViewRoot getViewRoot() { 4446 View root = getRootView(); 4447 return root != null ? (ViewRoot)root.getParent() : null; 4448 } 4449 4450 /** 4451 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4452 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4453 * touch mode to request focus when they are touched. 4454 * 4455 * @return Whether this view or one of its descendants actually took focus. 4456 * 4457 * @see #isInTouchMode() 4458 * 4459 */ 4460 public final boolean requestFocusFromTouch() { 4461 // Leave touch mode if we need to 4462 if (isInTouchMode()) { 4463 ViewRoot viewRoot = getViewRoot(); 4464 if (viewRoot != null) { 4465 viewRoot.ensureTouchMode(false); 4466 } 4467 } 4468 return requestFocus(View.FOCUS_DOWN); 4469 } 4470 4471 /** 4472 * @return Whether any ancestor of this view blocks descendant focus. 4473 */ 4474 private boolean hasAncestorThatBlocksDescendantFocus() { 4475 ViewParent ancestor = mParent; 4476 while (ancestor instanceof ViewGroup) { 4477 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4478 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4479 return true; 4480 } else { 4481 ancestor = vgAncestor.getParent(); 4482 } 4483 } 4484 return false; 4485 } 4486 4487 /** 4488 * @hide 4489 */ 4490 public void dispatchStartTemporaryDetach() { 4491 onStartTemporaryDetach(); 4492 } 4493 4494 /** 4495 * This is called when a container is going to temporarily detach a child, with 4496 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4497 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4498 * {@link #onDetachedFromWindow()} when the container is done. 4499 */ 4500 public void onStartTemporaryDetach() { 4501 removeUnsetPressCallback(); 4502 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4503 } 4504 4505 /** 4506 * @hide 4507 */ 4508 public void dispatchFinishTemporaryDetach() { 4509 onFinishTemporaryDetach(); 4510 } 4511 4512 /** 4513 * Called after {@link #onStartTemporaryDetach} when the container is done 4514 * changing the view. 4515 */ 4516 public void onFinishTemporaryDetach() { 4517 } 4518 4519 /** 4520 * capture information of this view for later analysis: developement only 4521 * check dynamic switch to make sure we only dump view 4522 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4523 */ 4524 private static void captureViewInfo(String subTag, View v) { 4525 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4526 return; 4527 } 4528 ViewDebug.dumpCapturedView(subTag, v); 4529 } 4530 4531 /** 4532 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4533 * for this view's window. Returns null if the view is not currently attached 4534 * to the window. Normally you will not need to use this directly, but 4535 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4536 */ 4537 public KeyEvent.DispatcherState getKeyDispatcherState() { 4538 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4539 } 4540 4541 /** 4542 * Dispatch a key event before it is processed by any input method 4543 * associated with the view hierarchy. This can be used to intercept 4544 * key events in special situations before the IME consumes them; a 4545 * typical example would be handling the BACK key to update the application's 4546 * UI instead of allowing the IME to see it and close itself. 4547 * 4548 * @param event The key event to be dispatched. 4549 * @return True if the event was handled, false otherwise. 4550 */ 4551 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4552 return onKeyPreIme(event.getKeyCode(), event); 4553 } 4554 4555 /** 4556 * Dispatch a key event to the next view on the focus path. This path runs 4557 * from the top of the view tree down to the currently focused view. If this 4558 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4559 * the next node down the focus path. This method also fires any key 4560 * listeners. 4561 * 4562 * @param event The key event to be dispatched. 4563 * @return True if the event was handled, false otherwise. 4564 */ 4565 public boolean dispatchKeyEvent(KeyEvent event) { 4566 // If any attached key listener a first crack at the event. 4567 4568 //noinspection SimplifiableIfStatement,deprecation 4569 if (android.util.Config.LOGV) { 4570 captureViewInfo("captureViewKeyEvent", this); 4571 } 4572 4573 //noinspection SimplifiableIfStatement 4574 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4575 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4576 return true; 4577 } 4578 4579 return event.dispatch(this, mAttachInfo != null 4580 ? mAttachInfo.mKeyDispatchState : null, this); 4581 } 4582 4583 /** 4584 * Dispatches a key shortcut event. 4585 * 4586 * @param event The key event to be dispatched. 4587 * @return True if the event was handled by the view, false otherwise. 4588 */ 4589 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4590 return onKeyShortcut(event.getKeyCode(), event); 4591 } 4592 4593 /** 4594 * Pass the touch screen motion event down to the target view, or this 4595 * view if it is the target. 4596 * 4597 * @param event The motion event to be dispatched. 4598 * @return True if the event was handled by the view, false otherwise. 4599 */ 4600 public boolean dispatchTouchEvent(MotionEvent event) { 4601 if (!onFilterTouchEventForSecurity(event)) { 4602 return false; 4603 } 4604 4605 //noinspection SimplifiableIfStatement 4606 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4607 mOnTouchListener.onTouch(this, event)) { 4608 return true; 4609 } 4610 return onTouchEvent(event); 4611 } 4612 4613 /** 4614 * Filter the touch event to apply security policies. 4615 * 4616 * @param event The motion event to be filtered. 4617 * @return True if the event should be dispatched, false if the event should be dropped. 4618 * 4619 * @see #getFilterTouchesWhenObscured 4620 */ 4621 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4622 //noinspection RedundantIfStatement 4623 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4624 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4625 // Window is obscured, drop this touch. 4626 return false; 4627 } 4628 return true; 4629 } 4630 4631 /** 4632 * Pass a trackball motion event down to the focused view. 4633 * 4634 * @param event The motion event to be dispatched. 4635 * @return True if the event was handled by the view, false otherwise. 4636 */ 4637 public boolean dispatchTrackballEvent(MotionEvent event) { 4638 //Log.i("view", "view=" + this + ", " + event.toString()); 4639 return onTrackballEvent(event); 4640 } 4641 4642 /** 4643 * Dispatch a generic motion event. 4644 * <p> 4645 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 4646 * are delivered to the view under the pointer. All other generic motion events are 4647 * delivered to the focused view. 4648 * </p> 4649 * 4650 * @param event The motion event to be dispatched. 4651 * @return True if the event was handled by the view, false otherwise. 4652 */ 4653 public boolean dispatchGenericMotionEvent(MotionEvent event) { 4654 if (mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4655 && mOnGenericMotionListener.onGenericMotion(this, event)) { 4656 return true; 4657 } 4658 4659 return onGenericMotionEvent(event); 4660 } 4661 4662 /** 4663 * Dispatch a pointer event. 4664 * <p> 4665 * Dispatches touch related pointer events to {@link #onTouchEvent} and all 4666 * other events to {@link #onGenericMotionEvent}. This separation of concerns 4667 * reinforces the invariant that {@link #onTouchEvent} is really about touches 4668 * and should not be expected to handle other pointing device features. 4669 * </p> 4670 * 4671 * @param event The motion event to be dispatched. 4672 * @return True if the event was handled by the view, false otherwise. 4673 * @hide 4674 */ 4675 public final boolean dispatchPointerEvent(MotionEvent event) { 4676 if (event.isTouchEvent()) { 4677 return dispatchTouchEvent(event); 4678 } else { 4679 return dispatchGenericMotionEvent(event); 4680 } 4681 } 4682 4683 /** 4684 * Called when the window containing this view gains or loses window focus. 4685 * ViewGroups should override to route to their children. 4686 * 4687 * @param hasFocus True if the window containing this view now has focus, 4688 * false otherwise. 4689 */ 4690 public void dispatchWindowFocusChanged(boolean hasFocus) { 4691 onWindowFocusChanged(hasFocus); 4692 } 4693 4694 /** 4695 * Called when the window containing this view gains or loses focus. Note 4696 * that this is separate from view focus: to receive key events, both 4697 * your view and its window must have focus. If a window is displayed 4698 * on top of yours that takes input focus, then your own window will lose 4699 * focus but the view focus will remain unchanged. 4700 * 4701 * @param hasWindowFocus True if the window containing this view now has 4702 * focus, false otherwise. 4703 */ 4704 public void onWindowFocusChanged(boolean hasWindowFocus) { 4705 InputMethodManager imm = InputMethodManager.peekInstance(); 4706 if (!hasWindowFocus) { 4707 if (isPressed()) { 4708 setPressed(false); 4709 } 4710 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4711 imm.focusOut(this); 4712 } 4713 removeLongPressCallback(); 4714 removeTapCallback(); 4715 onFocusLost(); 4716 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4717 imm.focusIn(this); 4718 } 4719 refreshDrawableState(); 4720 } 4721 4722 /** 4723 * Returns true if this view is in a window that currently has window focus. 4724 * Note that this is not the same as the view itself having focus. 4725 * 4726 * @return True if this view is in a window that currently has window focus. 4727 */ 4728 public boolean hasWindowFocus() { 4729 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4730 } 4731 4732 /** 4733 * Dispatch a view visibility change down the view hierarchy. 4734 * ViewGroups should override to route to their children. 4735 * @param changedView The view whose visibility changed. Could be 'this' or 4736 * an ancestor view. 4737 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4738 * {@link #INVISIBLE} or {@link #GONE}. 4739 */ 4740 protected void dispatchVisibilityChanged(View changedView, int visibility) { 4741 onVisibilityChanged(changedView, visibility); 4742 } 4743 4744 /** 4745 * Called when the visibility of the view or an ancestor of the view is changed. 4746 * @param changedView The view whose visibility changed. Could be 'this' or 4747 * an ancestor view. 4748 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4749 * {@link #INVISIBLE} or {@link #GONE}. 4750 */ 4751 protected void onVisibilityChanged(View changedView, int visibility) { 4752 if (visibility == VISIBLE) { 4753 if (mAttachInfo != null) { 4754 initialAwakenScrollBars(); 4755 } else { 4756 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4757 } 4758 } 4759 } 4760 4761 /** 4762 * Dispatch a hint about whether this view is displayed. For instance, when 4763 * a View moves out of the screen, it might receives a display hint indicating 4764 * the view is not displayed. Applications should not <em>rely</em> on this hint 4765 * as there is no guarantee that they will receive one. 4766 * 4767 * @param hint A hint about whether or not this view is displayed: 4768 * {@link #VISIBLE} or {@link #INVISIBLE}. 4769 */ 4770 public void dispatchDisplayHint(int hint) { 4771 onDisplayHint(hint); 4772 } 4773 4774 /** 4775 * Gives this view a hint about whether is displayed or not. For instance, when 4776 * a View moves out of the screen, it might receives a display hint indicating 4777 * the view is not displayed. Applications should not <em>rely</em> on this hint 4778 * as there is no guarantee that they will receive one. 4779 * 4780 * @param hint A hint about whether or not this view is displayed: 4781 * {@link #VISIBLE} or {@link #INVISIBLE}. 4782 */ 4783 protected void onDisplayHint(int hint) { 4784 } 4785 4786 /** 4787 * Dispatch a window visibility change down the view hierarchy. 4788 * ViewGroups should override to route to their children. 4789 * 4790 * @param visibility The new visibility of the window. 4791 * 4792 * @see #onWindowVisibilityChanged 4793 */ 4794 public void dispatchWindowVisibilityChanged(int visibility) { 4795 onWindowVisibilityChanged(visibility); 4796 } 4797 4798 /** 4799 * Called when the window containing has change its visibility 4800 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4801 * that this tells you whether or not your window is being made visible 4802 * to the window manager; this does <em>not</em> tell you whether or not 4803 * your window is obscured by other windows on the screen, even if it 4804 * is itself visible. 4805 * 4806 * @param visibility The new visibility of the window. 4807 */ 4808 protected void onWindowVisibilityChanged(int visibility) { 4809 if (visibility == VISIBLE) { 4810 initialAwakenScrollBars(); 4811 } 4812 } 4813 4814 /** 4815 * Returns the current visibility of the window this view is attached to 4816 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4817 * 4818 * @return Returns the current visibility of the view's window. 4819 */ 4820 public int getWindowVisibility() { 4821 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4822 } 4823 4824 /** 4825 * Retrieve the overall visible display size in which the window this view is 4826 * attached to has been positioned in. This takes into account screen 4827 * decorations above the window, for both cases where the window itself 4828 * is being position inside of them or the window is being placed under 4829 * then and covered insets are used for the window to position its content 4830 * inside. In effect, this tells you the available area where content can 4831 * be placed and remain visible to users. 4832 * 4833 * <p>This function requires an IPC back to the window manager to retrieve 4834 * the requested information, so should not be used in performance critical 4835 * code like drawing. 4836 * 4837 * @param outRect Filled in with the visible display frame. If the view 4838 * is not attached to a window, this is simply the raw display size. 4839 */ 4840 public void getWindowVisibleDisplayFrame(Rect outRect) { 4841 if (mAttachInfo != null) { 4842 try { 4843 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4844 } catch (RemoteException e) { 4845 return; 4846 } 4847 // XXX This is really broken, and probably all needs to be done 4848 // in the window manager, and we need to know more about whether 4849 // we want the area behind or in front of the IME. 4850 final Rect insets = mAttachInfo.mVisibleInsets; 4851 outRect.left += insets.left; 4852 outRect.top += insets.top; 4853 outRect.right -= insets.right; 4854 outRect.bottom -= insets.bottom; 4855 return; 4856 } 4857 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4858 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4859 } 4860 4861 /** 4862 * Dispatch a notification about a resource configuration change down 4863 * the view hierarchy. 4864 * ViewGroups should override to route to their children. 4865 * 4866 * @param newConfig The new resource configuration. 4867 * 4868 * @see #onConfigurationChanged 4869 */ 4870 public void dispatchConfigurationChanged(Configuration newConfig) { 4871 onConfigurationChanged(newConfig); 4872 } 4873 4874 /** 4875 * Called when the current configuration of the resources being used 4876 * by the application have changed. You can use this to decide when 4877 * to reload resources that can changed based on orientation and other 4878 * configuration characterstics. You only need to use this if you are 4879 * not relying on the normal {@link android.app.Activity} mechanism of 4880 * recreating the activity instance upon a configuration change. 4881 * 4882 * @param newConfig The new resource configuration. 4883 */ 4884 protected void onConfigurationChanged(Configuration newConfig) { 4885 } 4886 4887 /** 4888 * Private function to aggregate all per-view attributes in to the view 4889 * root. 4890 */ 4891 void dispatchCollectViewAttributes(int visibility) { 4892 performCollectViewAttributes(visibility); 4893 } 4894 4895 void performCollectViewAttributes(int visibility) { 4896 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 4897 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 4898 mAttachInfo.mKeepScreenOn = true; 4899 } 4900 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 4901 if (mOnSystemUiVisibilityChangeListener != null) { 4902 mAttachInfo.mHasSystemUiListeners = true; 4903 } 4904 } 4905 } 4906 4907 void needGlobalAttributesUpdate(boolean force) { 4908 final AttachInfo ai = mAttachInfo; 4909 if (ai != null) { 4910 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 4911 || ai.mHasSystemUiListeners) { 4912 ai.mRecomputeGlobalAttributes = true; 4913 } 4914 } 4915 } 4916 4917 /** 4918 * Returns whether the device is currently in touch mode. Touch mode is entered 4919 * once the user begins interacting with the device by touch, and affects various 4920 * things like whether focus is always visible to the user. 4921 * 4922 * @return Whether the device is in touch mode. 4923 */ 4924 @ViewDebug.ExportedProperty 4925 public boolean isInTouchMode() { 4926 if (mAttachInfo != null) { 4927 return mAttachInfo.mInTouchMode; 4928 } else { 4929 return ViewRoot.isInTouchMode(); 4930 } 4931 } 4932 4933 /** 4934 * Returns the context the view is running in, through which it can 4935 * access the current theme, resources, etc. 4936 * 4937 * @return The view's Context. 4938 */ 4939 @ViewDebug.CapturedViewProperty 4940 public final Context getContext() { 4941 return mContext; 4942 } 4943 4944 /** 4945 * Handle a key event before it is processed by any input method 4946 * associated with the view hierarchy. This can be used to intercept 4947 * key events in special situations before the IME consumes them; a 4948 * typical example would be handling the BACK key to update the application's 4949 * UI instead of allowing the IME to see it and close itself. 4950 * 4951 * @param keyCode The value in event.getKeyCode(). 4952 * @param event Description of the key event. 4953 * @return If you handled the event, return true. If you want to allow the 4954 * event to be handled by the next receiver, return false. 4955 */ 4956 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4957 return false; 4958 } 4959 4960 /** 4961 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 4962 * KeyEvent.Callback.onKeyDown()}: perform press of the view 4963 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4964 * is released, if the view is enabled and clickable. 4965 * 4966 * @param keyCode A key code that represents the button pressed, from 4967 * {@link android.view.KeyEvent}. 4968 * @param event The KeyEvent object that defines the button action. 4969 */ 4970 public boolean onKeyDown(int keyCode, KeyEvent event) { 4971 boolean result = false; 4972 4973 switch (keyCode) { 4974 case KeyEvent.KEYCODE_DPAD_CENTER: 4975 case KeyEvent.KEYCODE_ENTER: { 4976 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4977 return true; 4978 } 4979 // Long clickable items don't necessarily have to be clickable 4980 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4981 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4982 (event.getRepeatCount() == 0)) { 4983 setPressed(true); 4984 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4985 postCheckForLongClick(0); 4986 } 4987 return true; 4988 } 4989 break; 4990 } 4991 } 4992 return result; 4993 } 4994 4995 /** 4996 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4997 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4998 * the event). 4999 */ 5000 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 5001 return false; 5002 } 5003 5004 /** 5005 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 5006 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 5007 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 5008 * {@link KeyEvent#KEYCODE_ENTER} is released. 5009 * 5010 * @param keyCode A key code that represents the button pressed, from 5011 * {@link android.view.KeyEvent}. 5012 * @param event The KeyEvent object that defines the button action. 5013 */ 5014 public boolean onKeyUp(int keyCode, KeyEvent event) { 5015 boolean result = false; 5016 5017 switch (keyCode) { 5018 case KeyEvent.KEYCODE_DPAD_CENTER: 5019 case KeyEvent.KEYCODE_ENTER: { 5020 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5021 return true; 5022 } 5023 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 5024 setPressed(false); 5025 5026 if (!mHasPerformedLongPress) { 5027 // This is a tap, so remove the longpress check 5028 removeLongPressCallback(); 5029 5030 result = performClick(); 5031 } 5032 } 5033 break; 5034 } 5035 } 5036 return result; 5037 } 5038 5039 /** 5040 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 5041 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 5042 * the event). 5043 * 5044 * @param keyCode A key code that represents the button pressed, from 5045 * {@link android.view.KeyEvent}. 5046 * @param repeatCount The number of times the action was made. 5047 * @param event The KeyEvent object that defines the button action. 5048 */ 5049 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 5050 return false; 5051 } 5052 5053 /** 5054 * Called on the focused view when a key shortcut event is not handled. 5055 * Override this method to implement local key shortcuts for the View. 5056 * Key shortcuts can also be implemented by setting the 5057 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 5058 * 5059 * @param keyCode The value in event.getKeyCode(). 5060 * @param event Description of the key event. 5061 * @return If you handled the event, return true. If you want to allow the 5062 * event to be handled by the next receiver, return false. 5063 */ 5064 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 5065 return false; 5066 } 5067 5068 /** 5069 * Check whether the called view is a text editor, in which case it 5070 * would make sense to automatically display a soft input window for 5071 * it. Subclasses should override this if they implement 5072 * {@link #onCreateInputConnection(EditorInfo)} to return true if 5073 * a call on that method would return a non-null InputConnection, and 5074 * they are really a first-class editor that the user would normally 5075 * start typing on when the go into a window containing your view. 5076 * 5077 * <p>The default implementation always returns false. This does 5078 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 5079 * will not be called or the user can not otherwise perform edits on your 5080 * view; it is just a hint to the system that this is not the primary 5081 * purpose of this view. 5082 * 5083 * @return Returns true if this view is a text editor, else false. 5084 */ 5085 public boolean onCheckIsTextEditor() { 5086 return false; 5087 } 5088 5089 /** 5090 * Create a new InputConnection for an InputMethod to interact 5091 * with the view. The default implementation returns null, since it doesn't 5092 * support input methods. You can override this to implement such support. 5093 * This is only needed for views that take focus and text input. 5094 * 5095 * <p>When implementing this, you probably also want to implement 5096 * {@link #onCheckIsTextEditor()} to indicate you will return a 5097 * non-null InputConnection. 5098 * 5099 * @param outAttrs Fill in with attribute information about the connection. 5100 */ 5101 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 5102 return null; 5103 } 5104 5105 /** 5106 * Called by the {@link android.view.inputmethod.InputMethodManager} 5107 * when a view who is not the current 5108 * input connection target is trying to make a call on the manager. The 5109 * default implementation returns false; you can override this to return 5110 * true for certain views if you are performing InputConnection proxying 5111 * to them. 5112 * @param view The View that is making the InputMethodManager call. 5113 * @return Return true to allow the call, false to reject. 5114 */ 5115 public boolean checkInputConnectionProxy(View view) { 5116 return false; 5117 } 5118 5119 /** 5120 * Show the context menu for this view. It is not safe to hold on to the 5121 * menu after returning from this method. 5122 * 5123 * You should normally not overload this method. Overload 5124 * {@link #onCreateContextMenu(ContextMenu)} or define an 5125 * {@link OnCreateContextMenuListener} to add items to the context menu. 5126 * 5127 * @param menu The context menu to populate 5128 */ 5129 public void createContextMenu(ContextMenu menu) { 5130 ContextMenuInfo menuInfo = getContextMenuInfo(); 5131 5132 // Sets the current menu info so all items added to menu will have 5133 // my extra info set. 5134 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 5135 5136 onCreateContextMenu(menu); 5137 if (mOnCreateContextMenuListener != null) { 5138 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 5139 } 5140 5141 // Clear the extra information so subsequent items that aren't mine don't 5142 // have my extra info. 5143 ((MenuBuilder)menu).setCurrentMenuInfo(null); 5144 5145 if (mParent != null) { 5146 mParent.createContextMenu(menu); 5147 } 5148 } 5149 5150 /** 5151 * Views should implement this if they have extra information to associate 5152 * with the context menu. The return result is supplied as a parameter to 5153 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 5154 * callback. 5155 * 5156 * @return Extra information about the item for which the context menu 5157 * should be shown. This information will vary across different 5158 * subclasses of View. 5159 */ 5160 protected ContextMenuInfo getContextMenuInfo() { 5161 return null; 5162 } 5163 5164 /** 5165 * Views should implement this if the view itself is going to add items to 5166 * the context menu. 5167 * 5168 * @param menu the context menu to populate 5169 */ 5170 protected void onCreateContextMenu(ContextMenu menu) { 5171 } 5172 5173 /** 5174 * Implement this method to handle trackball motion events. The 5175 * <em>relative</em> movement of the trackball since the last event 5176 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 5177 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 5178 * that a movement of 1 corresponds to the user pressing one DPAD key (so 5179 * they will often be fractional values, representing the more fine-grained 5180 * movement information available from a trackball). 5181 * 5182 * @param event The motion event. 5183 * @return True if the event was handled, false otherwise. 5184 */ 5185 public boolean onTrackballEvent(MotionEvent event) { 5186 return false; 5187 } 5188 5189 /** 5190 * Implement this method to handle generic motion events. 5191 * <p> 5192 * Generic motion events describe joystick movements, mouse hovers, track pad 5193 * touches, scroll wheel movements and other input events. The 5194 * {@link MotionEvent#getSource() source} of the motion event specifies 5195 * the class of input that was received. Implementations of this method 5196 * must examine the bits in the source before processing the event. 5197 * The following code example shows how this is done. 5198 * </p><p> 5199 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5200 * are delivered to the view under the pointer. All other generic motion events are 5201 * delivered to the focused view. 5202 * </p> 5203 * <code> 5204 * public boolean onGenericMotionEvent(MotionEvent event) { 5205 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 5206 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 5207 * // process the joystick movement... 5208 * return true; 5209 * } 5210 * } 5211 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5212 * switch (event.getAction()) { 5213 * case MotionEvent.ACTION_HOVER_MOVE: 5214 * // process the mouse hover movement... 5215 * return true; 5216 * case MotionEvent.ACTION_SCROLL: 5217 * // process the scroll wheel movement... 5218 * return true; 5219 * } 5220 * } 5221 * return super.onGenericMotionEvent(event); 5222 * } 5223 * </code> 5224 * 5225 * @param event The generic motion event being processed. 5226 * 5227 * @return Return true if you have consumed the event, false if you haven't. 5228 * The default implementation always returns false. 5229 */ 5230 public boolean onGenericMotionEvent(MotionEvent event) { 5231 return false; 5232 } 5233 5234 /** 5235 * Implement this method to handle touch screen motion events. 5236 * 5237 * @param event The motion event. 5238 * @return True if the event was handled, false otherwise. 5239 */ 5240 public boolean onTouchEvent(MotionEvent event) { 5241 final int viewFlags = mViewFlags; 5242 5243 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5244 // A disabled view that is clickable still consumes the touch 5245 // events, it just doesn't respond to them. 5246 return (((viewFlags & CLICKABLE) == CLICKABLE || 5247 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5248 } 5249 5250 if (mTouchDelegate != null) { 5251 if (mTouchDelegate.onTouchEvent(event)) { 5252 return true; 5253 } 5254 } 5255 5256 if (((viewFlags & CLICKABLE) == CLICKABLE || 5257 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5258 switch (event.getAction()) { 5259 case MotionEvent.ACTION_UP: 5260 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5261 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5262 // take focus if we don't have it already and we should in 5263 // touch mode. 5264 boolean focusTaken = false; 5265 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5266 focusTaken = requestFocus(); 5267 } 5268 5269 if (prepressed) { 5270 // The button is being released before we actually 5271 // showed it as pressed. Make it show the pressed 5272 // state now (before scheduling the click) to ensure 5273 // the user sees it. 5274 mPrivateFlags |= PRESSED; 5275 refreshDrawableState(); 5276 } 5277 5278 if (!mHasPerformedLongPress) { 5279 // This is a tap, so remove the longpress check 5280 removeLongPressCallback(); 5281 5282 // Only perform take click actions if we were in the pressed state 5283 if (!focusTaken) { 5284 // Use a Runnable and post this rather than calling 5285 // performClick directly. This lets other visual state 5286 // of the view update before click actions start. 5287 if (mPerformClick == null) { 5288 mPerformClick = new PerformClick(); 5289 } 5290 if (!post(mPerformClick)) { 5291 performClick(); 5292 } 5293 } 5294 } 5295 5296 if (mUnsetPressedState == null) { 5297 mUnsetPressedState = new UnsetPressedState(); 5298 } 5299 5300 if (prepressed) { 5301 postDelayed(mUnsetPressedState, 5302 ViewConfiguration.getPressedStateDuration()); 5303 } else if (!post(mUnsetPressedState)) { 5304 // If the post failed, unpress right now 5305 mUnsetPressedState.run(); 5306 } 5307 removeTapCallback(); 5308 } 5309 break; 5310 5311 case MotionEvent.ACTION_DOWN: 5312 if (mPendingCheckForTap == null) { 5313 mPendingCheckForTap = new CheckForTap(); 5314 } 5315 mPrivateFlags |= PREPRESSED; 5316 mHasPerformedLongPress = false; 5317 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5318 break; 5319 5320 case MotionEvent.ACTION_CANCEL: 5321 mPrivateFlags &= ~PRESSED; 5322 refreshDrawableState(); 5323 removeTapCallback(); 5324 break; 5325 5326 case MotionEvent.ACTION_MOVE: 5327 final int x = (int) event.getX(); 5328 final int y = (int) event.getY(); 5329 5330 // Be lenient about moving outside of buttons 5331 if (!pointInView(x, y, mTouchSlop)) { 5332 // Outside button 5333 removeTapCallback(); 5334 if ((mPrivateFlags & PRESSED) != 0) { 5335 // Remove any future long press/tap checks 5336 removeLongPressCallback(); 5337 5338 // Need to switch from pressed to not pressed 5339 mPrivateFlags &= ~PRESSED; 5340 refreshDrawableState(); 5341 } 5342 } 5343 break; 5344 } 5345 return true; 5346 } 5347 5348 return false; 5349 } 5350 5351 /** 5352 * Remove the longpress detection timer. 5353 */ 5354 private void removeLongPressCallback() { 5355 if (mPendingCheckForLongPress != null) { 5356 removeCallbacks(mPendingCheckForLongPress); 5357 } 5358 } 5359 5360 /** 5361 * Remove the pending click action 5362 */ 5363 private void removePerformClickCallback() { 5364 if (mPerformClick != null) { 5365 removeCallbacks(mPerformClick); 5366 } 5367 } 5368 5369 /** 5370 * Remove the prepress detection timer. 5371 */ 5372 private void removeUnsetPressCallback() { 5373 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5374 setPressed(false); 5375 removeCallbacks(mUnsetPressedState); 5376 } 5377 } 5378 5379 /** 5380 * Remove the tap detection timer. 5381 */ 5382 private void removeTapCallback() { 5383 if (mPendingCheckForTap != null) { 5384 mPrivateFlags &= ~PREPRESSED; 5385 removeCallbacks(mPendingCheckForTap); 5386 } 5387 } 5388 5389 /** 5390 * Cancels a pending long press. Your subclass can use this if you 5391 * want the context menu to come up if the user presses and holds 5392 * at the same place, but you don't want it to come up if they press 5393 * and then move around enough to cause scrolling. 5394 */ 5395 public void cancelLongPress() { 5396 removeLongPressCallback(); 5397 5398 /* 5399 * The prepressed state handled by the tap callback is a display 5400 * construct, but the tap callback will post a long press callback 5401 * less its own timeout. Remove it here. 5402 */ 5403 removeTapCallback(); 5404 } 5405 5406 /** 5407 * Sets the TouchDelegate for this View. 5408 */ 5409 public void setTouchDelegate(TouchDelegate delegate) { 5410 mTouchDelegate = delegate; 5411 } 5412 5413 /** 5414 * Gets the TouchDelegate for this View. 5415 */ 5416 public TouchDelegate getTouchDelegate() { 5417 return mTouchDelegate; 5418 } 5419 5420 /** 5421 * Set flags controlling behavior of this view. 5422 * 5423 * @param flags Constant indicating the value which should be set 5424 * @param mask Constant indicating the bit range that should be changed 5425 */ 5426 void setFlags(int flags, int mask) { 5427 int old = mViewFlags; 5428 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5429 5430 int changed = mViewFlags ^ old; 5431 if (changed == 0) { 5432 return; 5433 } 5434 int privateFlags = mPrivateFlags; 5435 5436 /* Check if the FOCUSABLE bit has changed */ 5437 if (((changed & FOCUSABLE_MASK) != 0) && 5438 ((privateFlags & HAS_BOUNDS) !=0)) { 5439 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5440 && ((privateFlags & FOCUSED) != 0)) { 5441 /* Give up focus if we are no longer focusable */ 5442 clearFocus(); 5443 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 5444 && ((privateFlags & FOCUSED) == 0)) { 5445 /* 5446 * Tell the view system that we are now available to take focus 5447 * if no one else already has it. 5448 */ 5449 if (mParent != null) mParent.focusableViewAvailable(this); 5450 } 5451 } 5452 5453 if ((flags & VISIBILITY_MASK) == VISIBLE) { 5454 if ((changed & VISIBILITY_MASK) != 0) { 5455 /* 5456 * If this view is becoming visible, set the DRAWN flag so that 5457 * the next invalidate() will not be skipped. 5458 */ 5459 mPrivateFlags |= DRAWN; 5460 5461 needGlobalAttributesUpdate(true); 5462 5463 // a view becoming visible is worth notifying the parent 5464 // about in case nothing has focus. even if this specific view 5465 // isn't focusable, it may contain something that is, so let 5466 // the root view try to give this focus if nothing else does. 5467 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 5468 mParent.focusableViewAvailable(this); 5469 } 5470 } 5471 } 5472 5473 /* Check if the GONE bit has changed */ 5474 if ((changed & GONE) != 0) { 5475 needGlobalAttributesUpdate(false); 5476 requestLayout(); 5477 invalidate(true); 5478 5479 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 5480 if (hasFocus()) clearFocus(); 5481 destroyDrawingCache(); 5482 } 5483 if (mAttachInfo != null) { 5484 mAttachInfo.mViewVisibilityChanged = true; 5485 } 5486 } 5487 5488 /* Check if the VISIBLE bit has changed */ 5489 if ((changed & INVISIBLE) != 0) { 5490 needGlobalAttributesUpdate(false); 5491 invalidate(true); 5492 5493 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 5494 // root view becoming invisible shouldn't clear focus 5495 if (getRootView() != this) { 5496 clearFocus(); 5497 } 5498 } 5499 if (mAttachInfo != null) { 5500 mAttachInfo.mViewVisibilityChanged = true; 5501 } 5502 } 5503 5504 if ((changed & VISIBILITY_MASK) != 0) { 5505 if (mParent instanceof ViewGroup) { 5506 ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5507 ((View) mParent).invalidate(true); 5508 } 5509 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5510 } 5511 5512 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 5513 destroyDrawingCache(); 5514 } 5515 5516 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 5517 destroyDrawingCache(); 5518 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5519 invalidateParentCaches(); 5520 } 5521 5522 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 5523 destroyDrawingCache(); 5524 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5525 } 5526 5527 if ((changed & DRAW_MASK) != 0) { 5528 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 5529 if (mBGDrawable != null) { 5530 mPrivateFlags &= ~SKIP_DRAW; 5531 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 5532 } else { 5533 mPrivateFlags |= SKIP_DRAW; 5534 } 5535 } else { 5536 mPrivateFlags &= ~SKIP_DRAW; 5537 } 5538 requestLayout(); 5539 invalidate(true); 5540 } 5541 5542 if ((changed & KEEP_SCREEN_ON) != 0) { 5543 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 5544 mParent.recomputeViewAttributes(this); 5545 } 5546 } 5547 } 5548 5549 /** 5550 * Change the view's z order in the tree, so it's on top of other sibling 5551 * views 5552 */ 5553 public void bringToFront() { 5554 if (mParent != null) { 5555 mParent.bringChildToFront(this); 5556 } 5557 } 5558 5559 /** 5560 * This is called in response to an internal scroll in this view (i.e., the 5561 * view scrolled its own contents). This is typically as a result of 5562 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 5563 * called. 5564 * 5565 * @param l Current horizontal scroll origin. 5566 * @param t Current vertical scroll origin. 5567 * @param oldl Previous horizontal scroll origin. 5568 * @param oldt Previous vertical scroll origin. 5569 */ 5570 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 5571 mBackgroundSizeChanged = true; 5572 5573 final AttachInfo ai = mAttachInfo; 5574 if (ai != null) { 5575 ai.mViewScrollChanged = true; 5576 } 5577 } 5578 5579 /** 5580 * Interface definition for a callback to be invoked when the layout bounds of a view 5581 * changes due to layout processing. 5582 */ 5583 public interface OnLayoutChangeListener { 5584 /** 5585 * Called when the focus state of a view has changed. 5586 * 5587 * @param v The view whose state has changed. 5588 * @param left The new value of the view's left property. 5589 * @param top The new value of the view's top property. 5590 * @param right The new value of the view's right property. 5591 * @param bottom The new value of the view's bottom property. 5592 * @param oldLeft The previous value of the view's left property. 5593 * @param oldTop The previous value of the view's top property. 5594 * @param oldRight The previous value of the view's right property. 5595 * @param oldBottom The previous value of the view's bottom property. 5596 */ 5597 void onLayoutChange(View v, int left, int top, int right, int bottom, 5598 int oldLeft, int oldTop, int oldRight, int oldBottom); 5599 } 5600 5601 /** 5602 * This is called during layout when the size of this view has changed. If 5603 * you were just added to the view hierarchy, you're called with the old 5604 * values of 0. 5605 * 5606 * @param w Current width of this view. 5607 * @param h Current height of this view. 5608 * @param oldw Old width of this view. 5609 * @param oldh Old height of this view. 5610 */ 5611 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5612 } 5613 5614 /** 5615 * Called by draw to draw the child views. This may be overridden 5616 * by derived classes to gain control just before its children are drawn 5617 * (but after its own view has been drawn). 5618 * @param canvas the canvas on which to draw the view 5619 */ 5620 protected void dispatchDraw(Canvas canvas) { 5621 } 5622 5623 /** 5624 * Gets the parent of this view. Note that the parent is a 5625 * ViewParent and not necessarily a View. 5626 * 5627 * @return Parent of this view. 5628 */ 5629 public final ViewParent getParent() { 5630 return mParent; 5631 } 5632 5633 /** 5634 * Return the scrolled left position of this view. This is the left edge of 5635 * the displayed part of your view. You do not need to draw any pixels 5636 * farther left, since those are outside of the frame of your view on 5637 * screen. 5638 * 5639 * @return The left edge of the displayed part of your view, in pixels. 5640 */ 5641 public final int getScrollX() { 5642 return mScrollX; 5643 } 5644 5645 /** 5646 * Return the scrolled top position of this view. This is the top edge of 5647 * the displayed part of your view. You do not need to draw any pixels above 5648 * it, since those are outside of the frame of your view on screen. 5649 * 5650 * @return The top edge of the displayed part of your view, in pixels. 5651 */ 5652 public final int getScrollY() { 5653 return mScrollY; 5654 } 5655 5656 /** 5657 * Return the width of the your view. 5658 * 5659 * @return The width of your view, in pixels. 5660 */ 5661 @ViewDebug.ExportedProperty(category = "layout") 5662 public final int getWidth() { 5663 return mRight - mLeft; 5664 } 5665 5666 /** 5667 * Return the height of your view. 5668 * 5669 * @return The height of your view, in pixels. 5670 */ 5671 @ViewDebug.ExportedProperty(category = "layout") 5672 public final int getHeight() { 5673 return mBottom - mTop; 5674 } 5675 5676 /** 5677 * Return the visible drawing bounds of your view. Fills in the output 5678 * rectangle with the values from getScrollX(), getScrollY(), 5679 * getWidth(), and getHeight(). 5680 * 5681 * @param outRect The (scrolled) drawing bounds of the view. 5682 */ 5683 public void getDrawingRect(Rect outRect) { 5684 outRect.left = mScrollX; 5685 outRect.top = mScrollY; 5686 outRect.right = mScrollX + (mRight - mLeft); 5687 outRect.bottom = mScrollY + (mBottom - mTop); 5688 } 5689 5690 /** 5691 * Like {@link #getMeasuredWidthAndState()}, but only returns the 5692 * raw width component (that is the result is masked by 5693 * {@link #MEASURED_SIZE_MASK}). 5694 * 5695 * @return The raw measured width of this view. 5696 */ 5697 public final int getMeasuredWidth() { 5698 return mMeasuredWidth & MEASURED_SIZE_MASK; 5699 } 5700 5701 /** 5702 * Return the full width measurement information for this view as computed 5703 * by the most recent call to {@link #measure}. This result is a bit mask 5704 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5705 * This should be used during measurement and layout calculations only. Use 5706 * {@link #getWidth()} to see how wide a view is after layout. 5707 * 5708 * @return The measured width of this view as a bit mask. 5709 */ 5710 public final int getMeasuredWidthAndState() { 5711 return mMeasuredWidth; 5712 } 5713 5714 /** 5715 * Like {@link #getMeasuredHeightAndState()}, but only returns the 5716 * raw width component (that is the result is masked by 5717 * {@link #MEASURED_SIZE_MASK}). 5718 * 5719 * @return The raw measured height of this view. 5720 */ 5721 public final int getMeasuredHeight() { 5722 return mMeasuredHeight & MEASURED_SIZE_MASK; 5723 } 5724 5725 /** 5726 * Return the full height measurement information for this view as computed 5727 * by the most recent call to {@link #measure}. This result is a bit mask 5728 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5729 * This should be used during measurement and layout calculations only. Use 5730 * {@link #getHeight()} to see how wide a view is after layout. 5731 * 5732 * @return The measured width of this view as a bit mask. 5733 */ 5734 public final int getMeasuredHeightAndState() { 5735 return mMeasuredHeight; 5736 } 5737 5738 /** 5739 * Return only the state bits of {@link #getMeasuredWidthAndState()} 5740 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 5741 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 5742 * and the height component is at the shifted bits 5743 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 5744 */ 5745 public final int getMeasuredState() { 5746 return (mMeasuredWidth&MEASURED_STATE_MASK) 5747 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 5748 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 5749 } 5750 5751 /** 5752 * The transform matrix of this view, which is calculated based on the current 5753 * roation, scale, and pivot properties. 5754 * 5755 * @see #getRotation() 5756 * @see #getScaleX() 5757 * @see #getScaleY() 5758 * @see #getPivotX() 5759 * @see #getPivotY() 5760 * @return The current transform matrix for the view 5761 */ 5762 public Matrix getMatrix() { 5763 updateMatrix(); 5764 return mMatrix; 5765 } 5766 5767 /** 5768 * Utility function to determine if the value is far enough away from zero to be 5769 * considered non-zero. 5770 * @param value A floating point value to check for zero-ness 5771 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5772 */ 5773 private static boolean nonzero(float value) { 5774 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5775 } 5776 5777 /** 5778 * Returns true if the transform matrix is the identity matrix. 5779 * Recomputes the matrix if necessary. 5780 * 5781 * @return True if the transform matrix is the identity matrix, false otherwise. 5782 */ 5783 final boolean hasIdentityMatrix() { 5784 updateMatrix(); 5785 return mMatrixIsIdentity; 5786 } 5787 5788 /** 5789 * Recomputes the transform matrix if necessary. 5790 */ 5791 private void updateMatrix() { 5792 if (mMatrixDirty) { 5793 // transform-related properties have changed since the last time someone 5794 // asked for the matrix; recalculate it with the current values 5795 5796 // Figure out if we need to update the pivot point 5797 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5798 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 5799 mPrevWidth = mRight - mLeft; 5800 mPrevHeight = mBottom - mTop; 5801 mPivotX = mPrevWidth / 2f; 5802 mPivotY = mPrevHeight / 2f; 5803 } 5804 } 5805 mMatrix.reset(); 5806 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5807 mMatrix.setTranslate(mTranslationX, mTranslationY); 5808 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5809 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5810 } else { 5811 if (mCamera == null) { 5812 mCamera = new Camera(); 5813 matrix3D = new Matrix(); 5814 } 5815 mCamera.save(); 5816 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5817 mCamera.rotate(mRotationX, mRotationY, -mRotation); 5818 mCamera.getMatrix(matrix3D); 5819 matrix3D.preTranslate(-mPivotX, -mPivotY); 5820 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5821 mMatrix.postConcat(matrix3D); 5822 mCamera.restore(); 5823 } 5824 mMatrixDirty = false; 5825 mMatrixIsIdentity = mMatrix.isIdentity(); 5826 mInverseMatrixDirty = true; 5827 } 5828 } 5829 5830 /** 5831 * Utility method to retrieve the inverse of the current mMatrix property. 5832 * We cache the matrix to avoid recalculating it when transform properties 5833 * have not changed. 5834 * 5835 * @return The inverse of the current matrix of this view. 5836 */ 5837 final Matrix getInverseMatrix() { 5838 updateMatrix(); 5839 if (mInverseMatrixDirty) { 5840 if (mInverseMatrix == null) { 5841 mInverseMatrix = new Matrix(); 5842 } 5843 mMatrix.invert(mInverseMatrix); 5844 mInverseMatrixDirty = false; 5845 } 5846 return mInverseMatrix; 5847 } 5848 5849 /** 5850 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 5851 * views are drawn) from the camera to this view. The camera's distance 5852 * affects 3D transformations, for instance rotations around the X and Y 5853 * axis. If the rotationX or rotationY properties are changed and this view is 5854 * large (more than half the size of the screen), it is recommended to always 5855 * use a camera distance that's greater than the height (X axis rotation) or 5856 * the width (Y axis rotation) of this view.</p> 5857 * 5858 * <p>The distance of the camera from the view plane can have an affect on the 5859 * perspective distortion of the view when it is rotated around the x or y axis. 5860 * For example, a large distance will result in a large viewing angle, and there 5861 * will not be much perspective distortion of the view as it rotates. A short 5862 * distance may cause much more perspective distortion upon rotation, and can 5863 * also result in some drawing artifacts if the rotated view ends up partially 5864 * behind the camera (which is why the recommendation is to use a distance at 5865 * least as far as the size of the view, if the view is to be rotated.)</p> 5866 * 5867 * <p>The distance is expressed in "depth pixels." The default distance depends 5868 * on the screen density. For instance, on a medium density display, the 5869 * default distance is 1280. On a high density display, the default distance 5870 * is 1920.</p> 5871 * 5872 * <p>If you want to specify a distance that leads to visually consistent 5873 * results across various densities, use the following formula:</p> 5874 * <pre> 5875 * float scale = context.getResources().getDisplayMetrics().density; 5876 * view.setCameraDistance(distance * scale); 5877 * </pre> 5878 * 5879 * <p>The density scale factor of a high density display is 1.5, 5880 * and 1920 = 1280 * 1.5.</p> 5881 * 5882 * @param distance The distance in "depth pixels", if negative the opposite 5883 * value is used 5884 * 5885 * @see #setRotationX(float) 5886 * @see #setRotationY(float) 5887 */ 5888 public void setCameraDistance(float distance) { 5889 invalidateParentCaches(); 5890 invalidate(false); 5891 5892 final float dpi = mResources.getDisplayMetrics().densityDpi; 5893 if (mCamera == null) { 5894 mCamera = new Camera(); 5895 matrix3D = new Matrix(); 5896 } 5897 5898 mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 5899 mMatrixDirty = true; 5900 5901 invalidate(false); 5902 } 5903 5904 /** 5905 * The degrees that the view is rotated around the pivot point. 5906 * 5907 * @see #setRotation(float) 5908 * @see #getPivotX() 5909 * @see #getPivotY() 5910 * 5911 * @return The degrees of rotation. 5912 */ 5913 public float getRotation() { 5914 return mRotation; 5915 } 5916 5917 /** 5918 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5919 * result in clockwise rotation. 5920 * 5921 * @param rotation The degrees of rotation. 5922 * 5923 * @see #getRotation() 5924 * @see #getPivotX() 5925 * @see #getPivotY() 5926 * @see #setRotationX(float) 5927 * @see #setRotationY(float) 5928 * 5929 * @attr ref android.R.styleable#View_rotation 5930 */ 5931 public void setRotation(float rotation) { 5932 if (mRotation != rotation) { 5933 invalidateParentCaches(); 5934 // Double-invalidation is necessary to capture view's old and new areas 5935 invalidate(false); 5936 mRotation = rotation; 5937 mMatrixDirty = true; 5938 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5939 invalidate(false); 5940 } 5941 } 5942 5943 /** 5944 * The degrees that the view is rotated around the vertical axis through the pivot point. 5945 * 5946 * @see #getPivotX() 5947 * @see #getPivotY() 5948 * @see #setRotationY(float) 5949 * 5950 * @return The degrees of Y rotation. 5951 */ 5952 public float getRotationY() { 5953 return mRotationY; 5954 } 5955 5956 /** 5957 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5958 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5959 * down the y axis. 5960 * 5961 * When rotating large views, it is recommended to adjust the camera distance 5962 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 5963 * 5964 * @param rotationY The degrees of Y rotation. 5965 * 5966 * @see #getRotationY() 5967 * @see #getPivotX() 5968 * @see #getPivotY() 5969 * @see #setRotation(float) 5970 * @see #setRotationX(float) 5971 * @see #setCameraDistance(float) 5972 * 5973 * @attr ref android.R.styleable#View_rotationY 5974 */ 5975 public void setRotationY(float rotationY) { 5976 if (mRotationY != rotationY) { 5977 invalidateParentCaches(); 5978 // Double-invalidation is necessary to capture view's old and new areas 5979 invalidate(false); 5980 mRotationY = rotationY; 5981 mMatrixDirty = true; 5982 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5983 invalidate(false); 5984 } 5985 } 5986 5987 /** 5988 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5989 * 5990 * @see #getPivotX() 5991 * @see #getPivotY() 5992 * @see #setRotationX(float) 5993 * 5994 * @return The degrees of X rotation. 5995 */ 5996 public float getRotationX() { 5997 return mRotationX; 5998 } 5999 6000 /** 6001 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 6002 * Increasing values result in clockwise rotation from the viewpoint of looking down the 6003 * x axis. 6004 * 6005 * When rotating large views, it is recommended to adjust the camera distance 6006 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 6007 * 6008 * @param rotationX The degrees of X rotation. 6009 * 6010 * @see #getRotationX() 6011 * @see #getPivotX() 6012 * @see #getPivotY() 6013 * @see #setRotation(float) 6014 * @see #setRotationY(float) 6015 * @see #setCameraDistance(float) 6016 * 6017 * @attr ref android.R.styleable#View_rotationX 6018 */ 6019 public void setRotationX(float rotationX) { 6020 if (mRotationX != rotationX) { 6021 invalidateParentCaches(); 6022 // Double-invalidation is necessary to capture view's old and new areas 6023 invalidate(false); 6024 mRotationX = rotationX; 6025 mMatrixDirty = true; 6026 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6027 invalidate(false); 6028 } 6029 } 6030 6031 /** 6032 * The amount that the view is scaled in x around the pivot point, as a proportion of 6033 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 6034 * 6035 * <p>By default, this is 1.0f. 6036 * 6037 * @see #getPivotX() 6038 * @see #getPivotY() 6039 * @return The scaling factor. 6040 */ 6041 public float getScaleX() { 6042 return mScaleX; 6043 } 6044 6045 /** 6046 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 6047 * the view's unscaled width. A value of 1 means that no scaling is applied. 6048 * 6049 * @param scaleX The scaling factor. 6050 * @see #getPivotX() 6051 * @see #getPivotY() 6052 * 6053 * @attr ref android.R.styleable#View_scaleX 6054 */ 6055 public void setScaleX(float scaleX) { 6056 if (mScaleX != scaleX) { 6057 invalidateParentCaches(); 6058 // Double-invalidation is necessary to capture view's old and new areas 6059 invalidate(false); 6060 mScaleX = scaleX; 6061 mMatrixDirty = true; 6062 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6063 invalidate(false); 6064 } 6065 } 6066 6067 /** 6068 * The amount that the view is scaled in y around the pivot point, as a proportion of 6069 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 6070 * 6071 * <p>By default, this is 1.0f. 6072 * 6073 * @see #getPivotX() 6074 * @see #getPivotY() 6075 * @return The scaling factor. 6076 */ 6077 public float getScaleY() { 6078 return mScaleY; 6079 } 6080 6081 /** 6082 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 6083 * the view's unscaled width. A value of 1 means that no scaling is applied. 6084 * 6085 * @param scaleY The scaling factor. 6086 * @see #getPivotX() 6087 * @see #getPivotY() 6088 * 6089 * @attr ref android.R.styleable#View_scaleY 6090 */ 6091 public void setScaleY(float scaleY) { 6092 if (mScaleY != scaleY) { 6093 invalidateParentCaches(); 6094 // Double-invalidation is necessary to capture view's old and new areas 6095 invalidate(false); 6096 mScaleY = scaleY; 6097 mMatrixDirty = true; 6098 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6099 invalidate(false); 6100 } 6101 } 6102 6103 /** 6104 * The x location of the point around which the view is {@link #setRotation(float) rotated} 6105 * and {@link #setScaleX(float) scaled}. 6106 * 6107 * @see #getRotation() 6108 * @see #getScaleX() 6109 * @see #getScaleY() 6110 * @see #getPivotY() 6111 * @return The x location of the pivot point. 6112 */ 6113 public float getPivotX() { 6114 return mPivotX; 6115 } 6116 6117 /** 6118 * Sets the x location of the point around which the view is 6119 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 6120 * By default, the pivot point is centered on the object. 6121 * Setting this property disables this behavior and causes the view to use only the 6122 * explicitly set pivotX and pivotY values. 6123 * 6124 * @param pivotX The x location of the pivot point. 6125 * @see #getRotation() 6126 * @see #getScaleX() 6127 * @see #getScaleY() 6128 * @see #getPivotY() 6129 * 6130 * @attr ref android.R.styleable#View_transformPivotX 6131 */ 6132 public void setPivotX(float pivotX) { 6133 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 6134 if (mPivotX != pivotX) { 6135 invalidateParentCaches(); 6136 // Double-invalidation is necessary to capture view's old and new areas 6137 invalidate(false); 6138 mPivotX = pivotX; 6139 mMatrixDirty = true; 6140 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6141 invalidate(false); 6142 } 6143 } 6144 6145 /** 6146 * The y location of the point around which the view is {@link #setRotation(float) rotated} 6147 * and {@link #setScaleY(float) scaled}. 6148 * 6149 * @see #getRotation() 6150 * @see #getScaleX() 6151 * @see #getScaleY() 6152 * @see #getPivotY() 6153 * @return The y location of the pivot point. 6154 */ 6155 public float getPivotY() { 6156 return mPivotY; 6157 } 6158 6159 /** 6160 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 6161 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 6162 * Setting this property disables this behavior and causes the view to use only the 6163 * explicitly set pivotX and pivotY values. 6164 * 6165 * @param pivotY The y location of the pivot point. 6166 * @see #getRotation() 6167 * @see #getScaleX() 6168 * @see #getScaleY() 6169 * @see #getPivotY() 6170 * 6171 * @attr ref android.R.styleable#View_transformPivotY 6172 */ 6173 public void setPivotY(float pivotY) { 6174 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 6175 if (mPivotY != pivotY) { 6176 invalidateParentCaches(); 6177 // Double-invalidation is necessary to capture view's old and new areas 6178 invalidate(false); 6179 mPivotY = pivotY; 6180 mMatrixDirty = true; 6181 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6182 invalidate(false); 6183 } 6184 } 6185 6186 /** 6187 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 6188 * completely transparent and 1 means the view is completely opaque. 6189 * 6190 * <p>By default this is 1.0f. 6191 * @return The opacity of the view. 6192 */ 6193 public float getAlpha() { 6194 return mAlpha; 6195 } 6196 6197 /** 6198 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 6199 * completely transparent and 1 means the view is completely opaque.</p> 6200 * 6201 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 6202 * responsible for applying the opacity itself. Otherwise, calling this method is 6203 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 6204 * setting a hardware layer.</p> 6205 * 6206 * @param alpha The opacity of the view. 6207 * 6208 * @see #setLayerType(int, android.graphics.Paint) 6209 * 6210 * @attr ref android.R.styleable#View_alpha 6211 */ 6212 public void setAlpha(float alpha) { 6213 mAlpha = alpha; 6214 invalidateParentCaches(); 6215 if (onSetAlpha((int) (alpha * 255))) { 6216 mPrivateFlags |= ALPHA_SET; 6217 // subclass is handling alpha - don't optimize rendering cache invalidation 6218 invalidate(true); 6219 } else { 6220 mPrivateFlags &= ~ALPHA_SET; 6221 invalidate(false); 6222 } 6223 } 6224 6225 /** 6226 * Faster version of setAlpha() which performs the same steps except there are 6227 * no calls to invalidate(). The caller of this function should perform proper invalidation 6228 * on the parent and this object. The return value indicates whether the subclass handles 6229 * alpha (the return value for onSetAlpha()). 6230 * 6231 * @param alpha The new value for the alpha property 6232 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) 6233 */ 6234 boolean setAlphaNoInvalidation(float alpha) { 6235 mAlpha = alpha; 6236 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 6237 if (subclassHandlesAlpha) { 6238 mPrivateFlags |= ALPHA_SET; 6239 } else { 6240 mPrivateFlags &= ~ALPHA_SET; 6241 } 6242 return subclassHandlesAlpha; 6243 } 6244 6245 /** 6246 * Top position of this view relative to its parent. 6247 * 6248 * @return The top of this view, in pixels. 6249 */ 6250 @ViewDebug.CapturedViewProperty 6251 public final int getTop() { 6252 return mTop; 6253 } 6254 6255 /** 6256 * Sets the top position of this view relative to its parent. This method is meant to be called 6257 * by the layout system and should not generally be called otherwise, because the property 6258 * may be changed at any time by the layout. 6259 * 6260 * @param top The top of this view, in pixels. 6261 */ 6262 public final void setTop(int top) { 6263 if (top != mTop) { 6264 updateMatrix(); 6265 if (mMatrixIsIdentity) { 6266 if (mAttachInfo != null) { 6267 int minTop; 6268 int yLoc; 6269 if (top < mTop) { 6270 minTop = top; 6271 yLoc = top - mTop; 6272 } else { 6273 minTop = mTop; 6274 yLoc = 0; 6275 } 6276 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 6277 } 6278 } else { 6279 // Double-invalidation is necessary to capture view's old and new areas 6280 invalidate(true); 6281 } 6282 6283 int width = mRight - mLeft; 6284 int oldHeight = mBottom - mTop; 6285 6286 mTop = top; 6287 6288 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6289 6290 if (!mMatrixIsIdentity) { 6291 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6292 // A change in dimension means an auto-centered pivot point changes, too 6293 mMatrixDirty = true; 6294 } 6295 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6296 invalidate(true); 6297 } 6298 mBackgroundSizeChanged = true; 6299 invalidateParentIfNeeded(); 6300 } 6301 } 6302 6303 /** 6304 * Bottom position of this view relative to its parent. 6305 * 6306 * @return The bottom of this view, in pixels. 6307 */ 6308 @ViewDebug.CapturedViewProperty 6309 public final int getBottom() { 6310 return mBottom; 6311 } 6312 6313 /** 6314 * True if this view has changed since the last time being drawn. 6315 * 6316 * @return The dirty state of this view. 6317 */ 6318 public boolean isDirty() { 6319 return (mPrivateFlags & DIRTY_MASK) != 0; 6320 } 6321 6322 /** 6323 * Sets the bottom position of this view relative to its parent. This method is meant to be 6324 * called by the layout system and should not generally be called otherwise, because the 6325 * property may be changed at any time by the layout. 6326 * 6327 * @param bottom The bottom of this view, in pixels. 6328 */ 6329 public final void setBottom(int bottom) { 6330 if (bottom != mBottom) { 6331 updateMatrix(); 6332 if (mMatrixIsIdentity) { 6333 if (mAttachInfo != null) { 6334 int maxBottom; 6335 if (bottom < mBottom) { 6336 maxBottom = mBottom; 6337 } else { 6338 maxBottom = bottom; 6339 } 6340 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 6341 } 6342 } else { 6343 // Double-invalidation is necessary to capture view's old and new areas 6344 invalidate(true); 6345 } 6346 6347 int width = mRight - mLeft; 6348 int oldHeight = mBottom - mTop; 6349 6350 mBottom = bottom; 6351 6352 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6353 6354 if (!mMatrixIsIdentity) { 6355 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6356 // A change in dimension means an auto-centered pivot point changes, too 6357 mMatrixDirty = true; 6358 } 6359 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6360 invalidate(true); 6361 } 6362 mBackgroundSizeChanged = true; 6363 invalidateParentIfNeeded(); 6364 } 6365 } 6366 6367 /** 6368 * Left position of this view relative to its parent. 6369 * 6370 * @return The left edge of this view, in pixels. 6371 */ 6372 @ViewDebug.CapturedViewProperty 6373 public final int getLeft() { 6374 return mLeft; 6375 } 6376 6377 /** 6378 * Sets the left position of this view relative to its parent. This method is meant to be called 6379 * by the layout system and should not generally be called otherwise, because the property 6380 * may be changed at any time by the layout. 6381 * 6382 * @param left The bottom of this view, in pixels. 6383 */ 6384 public final void setLeft(int left) { 6385 if (left != mLeft) { 6386 updateMatrix(); 6387 if (mMatrixIsIdentity) { 6388 if (mAttachInfo != null) { 6389 int minLeft; 6390 int xLoc; 6391 if (left < mLeft) { 6392 minLeft = left; 6393 xLoc = left - mLeft; 6394 } else { 6395 minLeft = mLeft; 6396 xLoc = 0; 6397 } 6398 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 6399 } 6400 } else { 6401 // Double-invalidation is necessary to capture view's old and new areas 6402 invalidate(true); 6403 } 6404 6405 int oldWidth = mRight - mLeft; 6406 int height = mBottom - mTop; 6407 6408 mLeft = left; 6409 6410 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6411 6412 if (!mMatrixIsIdentity) { 6413 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6414 // A change in dimension means an auto-centered pivot point changes, too 6415 mMatrixDirty = true; 6416 } 6417 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6418 invalidate(true); 6419 } 6420 mBackgroundSizeChanged = true; 6421 invalidateParentIfNeeded(); 6422 } 6423 } 6424 6425 /** 6426 * Right position of this view relative to its parent. 6427 * 6428 * @return The right edge of this view, in pixels. 6429 */ 6430 @ViewDebug.CapturedViewProperty 6431 public final int getRight() { 6432 return mRight; 6433 } 6434 6435 /** 6436 * Sets the right position of this view relative to its parent. This method is meant to be called 6437 * by the layout system and should not generally be called otherwise, because the property 6438 * may be changed at any time by the layout. 6439 * 6440 * @param right The bottom of this view, in pixels. 6441 */ 6442 public final void setRight(int right) { 6443 if (right != mRight) { 6444 updateMatrix(); 6445 if (mMatrixIsIdentity) { 6446 if (mAttachInfo != null) { 6447 int maxRight; 6448 if (right < mRight) { 6449 maxRight = mRight; 6450 } else { 6451 maxRight = right; 6452 } 6453 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 6454 } 6455 } else { 6456 // Double-invalidation is necessary to capture view's old and new areas 6457 invalidate(true); 6458 } 6459 6460 int oldWidth = mRight - mLeft; 6461 int height = mBottom - mTop; 6462 6463 mRight = right; 6464 6465 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6466 6467 if (!mMatrixIsIdentity) { 6468 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6469 // A change in dimension means an auto-centered pivot point changes, too 6470 mMatrixDirty = true; 6471 } 6472 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6473 invalidate(true); 6474 } 6475 mBackgroundSizeChanged = true; 6476 invalidateParentIfNeeded(); 6477 } 6478 } 6479 6480 /** 6481 * The visual x position of this view, in pixels. This is equivalent to the 6482 * {@link #setTranslationX(float) translationX} property plus the current 6483 * {@link #getLeft() left} property. 6484 * 6485 * @return The visual x position of this view, in pixels. 6486 */ 6487 public float getX() { 6488 return mLeft + mTranslationX; 6489 } 6490 6491 /** 6492 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 6493 * {@link #setTranslationX(float) translationX} property to be the difference between 6494 * the x value passed in and the current {@link #getLeft() left} property. 6495 * 6496 * @param x The visual x position of this view, in pixels. 6497 */ 6498 public void setX(float x) { 6499 setTranslationX(x - mLeft); 6500 } 6501 6502 /** 6503 * The visual y position of this view, in pixels. This is equivalent to the 6504 * {@link #setTranslationY(float) translationY} property plus the current 6505 * {@link #getTop() top} property. 6506 * 6507 * @return The visual y position of this view, in pixels. 6508 */ 6509 public float getY() { 6510 return mTop + mTranslationY; 6511 } 6512 6513 /** 6514 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 6515 * {@link #setTranslationY(float) translationY} property to be the difference between 6516 * the y value passed in and the current {@link #getTop() top} property. 6517 * 6518 * @param y The visual y position of this view, in pixels. 6519 */ 6520 public void setY(float y) { 6521 setTranslationY(y - mTop); 6522 } 6523 6524 6525 /** 6526 * The horizontal location of this view relative to its {@link #getLeft() left} position. 6527 * This position is post-layout, in addition to wherever the object's 6528 * layout placed it. 6529 * 6530 * @return The horizontal position of this view relative to its left position, in pixels. 6531 */ 6532 public float getTranslationX() { 6533 return mTranslationX; 6534 } 6535 6536 /** 6537 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 6538 * This effectively positions the object post-layout, in addition to wherever the object's 6539 * layout placed it. 6540 * 6541 * @param translationX The horizontal position of this view relative to its left position, 6542 * in pixels. 6543 * 6544 * @attr ref android.R.styleable#View_translationX 6545 */ 6546 public void setTranslationX(float translationX) { 6547 if (mTranslationX != translationX) { 6548 invalidateParentCaches(); 6549 // Double-invalidation is necessary to capture view's old and new areas 6550 invalidate(false); 6551 mTranslationX = translationX; 6552 mMatrixDirty = true; 6553 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6554 invalidate(false); 6555 } 6556 } 6557 6558 /** 6559 * The horizontal location of this view relative to its {@link #getTop() top} position. 6560 * This position is post-layout, in addition to wherever the object's 6561 * layout placed it. 6562 * 6563 * @return The vertical position of this view relative to its top position, 6564 * in pixels. 6565 */ 6566 public float getTranslationY() { 6567 return mTranslationY; 6568 } 6569 6570 /** 6571 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 6572 * This effectively positions the object post-layout, in addition to wherever the object's 6573 * layout placed it. 6574 * 6575 * @param translationY The vertical position of this view relative to its top position, 6576 * in pixels. 6577 * 6578 * @attr ref android.R.styleable#View_translationY 6579 */ 6580 public void setTranslationY(float translationY) { 6581 if (mTranslationY != translationY) { 6582 invalidateParentCaches(); 6583 // Double-invalidation is necessary to capture view's old and new areas 6584 invalidate(false); 6585 mTranslationY = translationY; 6586 mMatrixDirty = true; 6587 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6588 invalidate(false); 6589 } 6590 } 6591 6592 /** 6593 * @hide 6594 */ 6595 public void setFastTranslationX(float x) { 6596 mTranslationX = x; 6597 mMatrixDirty = true; 6598 } 6599 6600 /** 6601 * @hide 6602 */ 6603 public void setFastTranslationY(float y) { 6604 mTranslationY = y; 6605 mMatrixDirty = true; 6606 } 6607 6608 /** 6609 * @hide 6610 */ 6611 public void setFastX(float x) { 6612 mTranslationX = x - mLeft; 6613 mMatrixDirty = true; 6614 } 6615 6616 /** 6617 * @hide 6618 */ 6619 public void setFastY(float y) { 6620 mTranslationY = y - mTop; 6621 mMatrixDirty = true; 6622 } 6623 6624 /** 6625 * @hide 6626 */ 6627 public void setFastScaleX(float x) { 6628 mScaleX = x; 6629 mMatrixDirty = true; 6630 } 6631 6632 /** 6633 * @hide 6634 */ 6635 public void setFastScaleY(float y) { 6636 mScaleY = y; 6637 mMatrixDirty = true; 6638 } 6639 6640 /** 6641 * @hide 6642 */ 6643 public void setFastAlpha(float alpha) { 6644 mAlpha = alpha; 6645 } 6646 6647 /** 6648 * @hide 6649 */ 6650 public void setFastRotationY(float y) { 6651 mRotationY = y; 6652 mMatrixDirty = true; 6653 } 6654 6655 /** 6656 * Hit rectangle in parent's coordinates 6657 * 6658 * @param outRect The hit rectangle of the view. 6659 */ 6660 public void getHitRect(Rect outRect) { 6661 updateMatrix(); 6662 if (mMatrixIsIdentity || mAttachInfo == null) { 6663 outRect.set(mLeft, mTop, mRight, mBottom); 6664 } else { 6665 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 6666 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 6667 mMatrix.mapRect(tmpRect); 6668 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 6669 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 6670 } 6671 } 6672 6673 /** 6674 * Determines whether the given point, in local coordinates is inside the view. 6675 */ 6676 /*package*/ final boolean pointInView(float localX, float localY) { 6677 return localX >= 0 && localX < (mRight - mLeft) 6678 && localY >= 0 && localY < (mBottom - mTop); 6679 } 6680 6681 /** 6682 * Utility method to determine whether the given point, in local coordinates, 6683 * is inside the view, where the area of the view is expanded by the slop factor. 6684 * This method is called while processing touch-move events to determine if the event 6685 * is still within the view. 6686 */ 6687 private boolean pointInView(float localX, float localY, float slop) { 6688 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 6689 localY < ((mBottom - mTop) + slop); 6690 } 6691 6692 /** 6693 * When a view has focus and the user navigates away from it, the next view is searched for 6694 * starting from the rectangle filled in by this method. 6695 * 6696 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 6697 * view maintains some idea of internal selection, such as a cursor, or a selected row 6698 * or column, you should override this method and fill in a more specific rectangle. 6699 * 6700 * @param r The rectangle to fill in, in this view's coordinates. 6701 */ 6702 public void getFocusedRect(Rect r) { 6703 getDrawingRect(r); 6704 } 6705 6706 /** 6707 * If some part of this view is not clipped by any of its parents, then 6708 * return that area in r in global (root) coordinates. To convert r to local 6709 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 6710 * -globalOffset.y)) If the view is completely clipped or translated out, 6711 * return false. 6712 * 6713 * @param r If true is returned, r holds the global coordinates of the 6714 * visible portion of this view. 6715 * @param globalOffset If true is returned, globalOffset holds the dx,dy 6716 * between this view and its root. globalOffet may be null. 6717 * @return true if r is non-empty (i.e. part of the view is visible at the 6718 * root level. 6719 */ 6720 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 6721 int width = mRight - mLeft; 6722 int height = mBottom - mTop; 6723 if (width > 0 && height > 0) { 6724 r.set(0, 0, width, height); 6725 if (globalOffset != null) { 6726 globalOffset.set(-mScrollX, -mScrollY); 6727 } 6728 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 6729 } 6730 return false; 6731 } 6732 6733 public final boolean getGlobalVisibleRect(Rect r) { 6734 return getGlobalVisibleRect(r, null); 6735 } 6736 6737 public final boolean getLocalVisibleRect(Rect r) { 6738 Point offset = new Point(); 6739 if (getGlobalVisibleRect(r, offset)) { 6740 r.offset(-offset.x, -offset.y); // make r local 6741 return true; 6742 } 6743 return false; 6744 } 6745 6746 /** 6747 * Offset this view's vertical location by the specified number of pixels. 6748 * 6749 * @param offset the number of pixels to offset the view by 6750 */ 6751 public void offsetTopAndBottom(int offset) { 6752 if (offset != 0) { 6753 updateMatrix(); 6754 if (mMatrixIsIdentity) { 6755 final ViewParent p = mParent; 6756 if (p != null && mAttachInfo != null) { 6757 final Rect r = mAttachInfo.mTmpInvalRect; 6758 int minTop; 6759 int maxBottom; 6760 int yLoc; 6761 if (offset < 0) { 6762 minTop = mTop + offset; 6763 maxBottom = mBottom; 6764 yLoc = offset; 6765 } else { 6766 minTop = mTop; 6767 maxBottom = mBottom + offset; 6768 yLoc = 0; 6769 } 6770 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 6771 p.invalidateChild(this, r); 6772 } 6773 } else { 6774 invalidate(false); 6775 } 6776 6777 mTop += offset; 6778 mBottom += offset; 6779 6780 if (!mMatrixIsIdentity) { 6781 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6782 invalidate(false); 6783 } 6784 invalidateParentIfNeeded(); 6785 } 6786 } 6787 6788 /** 6789 * Offset this view's horizontal location by the specified amount of pixels. 6790 * 6791 * @param offset the numer of pixels to offset the view by 6792 */ 6793 public void offsetLeftAndRight(int offset) { 6794 if (offset != 0) { 6795 updateMatrix(); 6796 if (mMatrixIsIdentity) { 6797 final ViewParent p = mParent; 6798 if (p != null && mAttachInfo != null) { 6799 final Rect r = mAttachInfo.mTmpInvalRect; 6800 int minLeft; 6801 int maxRight; 6802 if (offset < 0) { 6803 minLeft = mLeft + offset; 6804 maxRight = mRight; 6805 } else { 6806 minLeft = mLeft; 6807 maxRight = mRight + offset; 6808 } 6809 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 6810 p.invalidateChild(this, r); 6811 } 6812 } else { 6813 invalidate(false); 6814 } 6815 6816 mLeft += offset; 6817 mRight += offset; 6818 6819 if (!mMatrixIsIdentity) { 6820 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6821 invalidate(false); 6822 } 6823 invalidateParentIfNeeded(); 6824 } 6825 } 6826 6827 /** 6828 * Get the LayoutParams associated with this view. All views should have 6829 * layout parameters. These supply parameters to the <i>parent</i> of this 6830 * view specifying how it should be arranged. There are many subclasses of 6831 * ViewGroup.LayoutParams, and these correspond to the different subclasses 6832 * of ViewGroup that are responsible for arranging their children. 6833 * 6834 * This method may return null if this View is not attached to a parent 6835 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 6836 * was not invoked successfully. When a View is attached to a parent 6837 * ViewGroup, this method must not return null. 6838 * 6839 * @return The LayoutParams associated with this view, or null if no 6840 * parameters have been set yet 6841 */ 6842 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 6843 public ViewGroup.LayoutParams getLayoutParams() { 6844 return mLayoutParams; 6845 } 6846 6847 /** 6848 * Set the layout parameters associated with this view. These supply 6849 * parameters to the <i>parent</i> of this view specifying how it should be 6850 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 6851 * correspond to the different subclasses of ViewGroup that are responsible 6852 * for arranging their children. 6853 * 6854 * @param params The layout parameters for this view, cannot be null 6855 */ 6856 public void setLayoutParams(ViewGroup.LayoutParams params) { 6857 if (params == null) { 6858 throw new NullPointerException("Layout parameters cannot be null"); 6859 } 6860 mLayoutParams = params; 6861 requestLayout(); 6862 } 6863 6864 /** 6865 * Set the scrolled position of your view. This will cause a call to 6866 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6867 * invalidated. 6868 * @param x the x position to scroll to 6869 * @param y the y position to scroll to 6870 */ 6871 public void scrollTo(int x, int y) { 6872 if (mScrollX != x || mScrollY != y) { 6873 int oldX = mScrollX; 6874 int oldY = mScrollY; 6875 mScrollX = x; 6876 mScrollY = y; 6877 invalidateParentCaches(); 6878 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 6879 if (!awakenScrollBars()) { 6880 invalidate(true); 6881 } 6882 } 6883 } 6884 6885 /** 6886 * Move the scrolled position of your view. This will cause a call to 6887 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6888 * invalidated. 6889 * @param x the amount of pixels to scroll by horizontally 6890 * @param y the amount of pixels to scroll by vertically 6891 */ 6892 public void scrollBy(int x, int y) { 6893 scrollTo(mScrollX + x, mScrollY + y); 6894 } 6895 6896 /** 6897 * <p>Trigger the scrollbars to draw. When invoked this method starts an 6898 * animation to fade the scrollbars out after a default delay. If a subclass 6899 * provides animated scrolling, the start delay should equal the duration 6900 * of the scrolling animation.</p> 6901 * 6902 * <p>The animation starts only if at least one of the scrollbars is 6903 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 6904 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6905 * this method returns true, and false otherwise. If the animation is 6906 * started, this method calls {@link #invalidate()}; in that case the 6907 * caller should not call {@link #invalidate()}.</p> 6908 * 6909 * <p>This method should be invoked every time a subclass directly updates 6910 * the scroll parameters.</p> 6911 * 6912 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6913 * and {@link #scrollTo(int, int)}.</p> 6914 * 6915 * @return true if the animation is played, false otherwise 6916 * 6917 * @see #awakenScrollBars(int) 6918 * @see #scrollBy(int, int) 6919 * @see #scrollTo(int, int) 6920 * @see #isHorizontalScrollBarEnabled() 6921 * @see #isVerticalScrollBarEnabled() 6922 * @see #setHorizontalScrollBarEnabled(boolean) 6923 * @see #setVerticalScrollBarEnabled(boolean) 6924 */ 6925 protected boolean awakenScrollBars() { 6926 return mScrollCache != null && 6927 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6928 } 6929 6930 /** 6931 * Trigger the scrollbars to draw. 6932 * This method differs from awakenScrollBars() only in its default duration. 6933 * initialAwakenScrollBars() will show the scroll bars for longer than 6934 * usual to give the user more of a chance to notice them. 6935 * 6936 * @return true if the animation is played, false otherwise. 6937 */ 6938 private boolean initialAwakenScrollBars() { 6939 return mScrollCache != null && 6940 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6941 } 6942 6943 /** 6944 * <p> 6945 * Trigger the scrollbars to draw. When invoked this method starts an 6946 * animation to fade the scrollbars out after a fixed delay. If a subclass 6947 * provides animated scrolling, the start delay should equal the duration of 6948 * the scrolling animation. 6949 * </p> 6950 * 6951 * <p> 6952 * The animation starts only if at least one of the scrollbars is enabled, 6953 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6954 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6955 * this method returns true, and false otherwise. If the animation is 6956 * started, this method calls {@link #invalidate()}; in that case the caller 6957 * should not call {@link #invalidate()}. 6958 * </p> 6959 * 6960 * <p> 6961 * This method should be invoked everytime a subclass directly updates the 6962 * scroll parameters. 6963 * </p> 6964 * 6965 * @param startDelay the delay, in milliseconds, after which the animation 6966 * should start; when the delay is 0, the animation starts 6967 * immediately 6968 * @return true if the animation is played, false otherwise 6969 * 6970 * @see #scrollBy(int, int) 6971 * @see #scrollTo(int, int) 6972 * @see #isHorizontalScrollBarEnabled() 6973 * @see #isVerticalScrollBarEnabled() 6974 * @see #setHorizontalScrollBarEnabled(boolean) 6975 * @see #setVerticalScrollBarEnabled(boolean) 6976 */ 6977 protected boolean awakenScrollBars(int startDelay) { 6978 return awakenScrollBars(startDelay, true); 6979 } 6980 6981 /** 6982 * <p> 6983 * Trigger the scrollbars to draw. When invoked this method starts an 6984 * animation to fade the scrollbars out after a fixed delay. If a subclass 6985 * provides animated scrolling, the start delay should equal the duration of 6986 * the scrolling animation. 6987 * </p> 6988 * 6989 * <p> 6990 * The animation starts only if at least one of the scrollbars is enabled, 6991 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6992 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6993 * this method returns true, and false otherwise. If the animation is 6994 * started, this method calls {@link #invalidate()} if the invalidate parameter 6995 * is set to true; in that case the caller 6996 * should not call {@link #invalidate()}. 6997 * </p> 6998 * 6999 * <p> 7000 * This method should be invoked everytime a subclass directly updates the 7001 * scroll parameters. 7002 * </p> 7003 * 7004 * @param startDelay the delay, in milliseconds, after which the animation 7005 * should start; when the delay is 0, the animation starts 7006 * immediately 7007 * 7008 * @param invalidate Wheter this method should call invalidate 7009 * 7010 * @return true if the animation is played, false otherwise 7011 * 7012 * @see #scrollBy(int, int) 7013 * @see #scrollTo(int, int) 7014 * @see #isHorizontalScrollBarEnabled() 7015 * @see #isVerticalScrollBarEnabled() 7016 * @see #setHorizontalScrollBarEnabled(boolean) 7017 * @see #setVerticalScrollBarEnabled(boolean) 7018 */ 7019 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 7020 final ScrollabilityCache scrollCache = mScrollCache; 7021 7022 if (scrollCache == null || !scrollCache.fadeScrollBars) { 7023 return false; 7024 } 7025 7026 if (scrollCache.scrollBar == null) { 7027 scrollCache.scrollBar = new ScrollBarDrawable(); 7028 } 7029 7030 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 7031 7032 if (invalidate) { 7033 // Invalidate to show the scrollbars 7034 invalidate(true); 7035 } 7036 7037 if (scrollCache.state == ScrollabilityCache.OFF) { 7038 // FIXME: this is copied from WindowManagerService. 7039 // We should get this value from the system when it 7040 // is possible to do so. 7041 final int KEY_REPEAT_FIRST_DELAY = 750; 7042 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 7043 } 7044 7045 // Tell mScrollCache when we should start fading. This may 7046 // extend the fade start time if one was already scheduled 7047 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 7048 scrollCache.fadeStartTime = fadeStartTime; 7049 scrollCache.state = ScrollabilityCache.ON; 7050 7051 // Schedule our fader to run, unscheduling any old ones first 7052 if (mAttachInfo != null) { 7053 mAttachInfo.mHandler.removeCallbacks(scrollCache); 7054 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 7055 } 7056 7057 return true; 7058 } 7059 7060 return false; 7061 } 7062 7063 /** 7064 * Mark the the area defined by dirty as needing to be drawn. If the view is 7065 * visible, {@link #onDraw} will be called at some point in the future. 7066 * This must be called from a UI thread. To call from a non-UI thread, call 7067 * {@link #postInvalidate()}. 7068 * 7069 * WARNING: This method is destructive to dirty. 7070 * @param dirty the rectangle representing the bounds of the dirty region 7071 */ 7072 public void invalidate(Rect dirty) { 7073 if (ViewDebug.TRACE_HIERARCHY) { 7074 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 7075 } 7076 7077 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7078 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 7079 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 7080 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7081 mPrivateFlags |= INVALIDATED; 7082 final ViewParent p = mParent; 7083 final AttachInfo ai = mAttachInfo; 7084 //noinspection PointlessBooleanExpression,ConstantConditions 7085 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 7086 if (p != null && ai != null && ai.mHardwareAccelerated) { 7087 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 7088 // with a null dirty rect, which tells the ViewRoot to redraw everything 7089 p.invalidateChild(this, null); 7090 return; 7091 } 7092 } 7093 if (p != null && ai != null) { 7094 final int scrollX = mScrollX; 7095 final int scrollY = mScrollY; 7096 final Rect r = ai.mTmpInvalRect; 7097 r.set(dirty.left - scrollX, dirty.top - scrollY, 7098 dirty.right - scrollX, dirty.bottom - scrollY); 7099 mParent.invalidateChild(this, r); 7100 } 7101 } 7102 } 7103 7104 /** 7105 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 7106 * The coordinates of the dirty rect are relative to the view. 7107 * If the view is visible, {@link #onDraw} will be called at some point 7108 * in the future. This must be called from a UI thread. To call 7109 * from a non-UI thread, call {@link #postInvalidate()}. 7110 * @param l the left position of the dirty region 7111 * @param t the top position of the dirty region 7112 * @param r the right position of the dirty region 7113 * @param b the bottom position of the dirty region 7114 */ 7115 public void invalidate(int l, int t, int r, int b) { 7116 if (ViewDebug.TRACE_HIERARCHY) { 7117 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 7118 } 7119 7120 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7121 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 7122 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 7123 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7124 mPrivateFlags |= INVALIDATED; 7125 final ViewParent p = mParent; 7126 final AttachInfo ai = mAttachInfo; 7127 //noinspection PointlessBooleanExpression,ConstantConditions 7128 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 7129 if (p != null && ai != null && ai.mHardwareAccelerated) { 7130 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 7131 // with a null dirty rect, which tells the ViewRoot to redraw everything 7132 p.invalidateChild(this, null); 7133 return; 7134 } 7135 } 7136 if (p != null && ai != null && l < r && t < b) { 7137 final int scrollX = mScrollX; 7138 final int scrollY = mScrollY; 7139 final Rect tmpr = ai.mTmpInvalRect; 7140 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 7141 p.invalidateChild(this, tmpr); 7142 } 7143 } 7144 } 7145 7146 /** 7147 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 7148 * be called at some point in the future. This must be called from a 7149 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 7150 */ 7151 public void invalidate() { 7152 invalidate(true); 7153 } 7154 7155 /** 7156 * This is where the invalidate() work actually happens. A full invalidate() 7157 * causes the drawing cache to be invalidated, but this function can be called with 7158 * invalidateCache set to false to skip that invalidation step for cases that do not 7159 * need it (for example, a component that remains at the same dimensions with the same 7160 * content). 7161 * 7162 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 7163 * well. This is usually true for a full invalidate, but may be set to false if the 7164 * View's contents or dimensions have not changed. 7165 */ 7166 void invalidate(boolean invalidateCache) { 7167 if (ViewDebug.TRACE_HIERARCHY) { 7168 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 7169 } 7170 7171 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7172 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 7173 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 7174 mLastIsOpaque = isOpaque(); 7175 mPrivateFlags &= ~DRAWN; 7176 if (invalidateCache) { 7177 mPrivateFlags |= INVALIDATED; 7178 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7179 } 7180 final AttachInfo ai = mAttachInfo; 7181 final ViewParent p = mParent; 7182 //noinspection PointlessBooleanExpression,ConstantConditions 7183 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 7184 if (p != null && ai != null && ai.mHardwareAccelerated) { 7185 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 7186 // with a null dirty rect, which tells the ViewRoot to redraw everything 7187 p.invalidateChild(this, null); 7188 return; 7189 } 7190 } 7191 7192 if (p != null && ai != null) { 7193 final Rect r = ai.mTmpInvalRect; 7194 r.set(0, 0, mRight - mLeft, mBottom - mTop); 7195 // Don't call invalidate -- we don't want to internally scroll 7196 // our own bounds 7197 p.invalidateChild(this, r); 7198 } 7199 } 7200 } 7201 7202 /** 7203 * @hide 7204 */ 7205 public void fastInvalidate() { 7206 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 7207 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 7208 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 7209 if (mParent instanceof View) { 7210 ((View) mParent).mPrivateFlags |= INVALIDATED; 7211 } 7212 mPrivateFlags &= ~DRAWN; 7213 mPrivateFlags |= INVALIDATED; 7214 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7215 if (mParent != null && mAttachInfo != null && mAttachInfo.mHardwareAccelerated) { 7216 mParent.invalidateChild(this, null); 7217 } 7218 } 7219 } 7220 7221 /** 7222 * Used to indicate that the parent of this view should clear its caches. This functionality 7223 * is used to force the parent to rebuild its display list (when hardware-accelerated), 7224 * which is necessary when various parent-managed properties of the view change, such as 7225 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 7226 * clears the parent caches and does not causes an invalidate event. 7227 * 7228 * @hide 7229 */ 7230 protected void invalidateParentCaches() { 7231 if (mParent instanceof View) { 7232 ((View) mParent).mPrivateFlags |= INVALIDATED; 7233 } 7234 } 7235 7236 /** 7237 * Used to indicate that the parent of this view should be invalidated. This functionality 7238 * is used to force the parent to rebuild its display list (when hardware-accelerated), 7239 * which is necessary when various parent-managed properties of the view change, such as 7240 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 7241 * an invalidation event to the parent. 7242 * 7243 * @hide 7244 */ 7245 protected void invalidateParentIfNeeded() { 7246 if (isHardwareAccelerated() && mParent instanceof View) { 7247 ((View) mParent).invalidate(true); 7248 } 7249 } 7250 7251 /** 7252 * Indicates whether this View is opaque. An opaque View guarantees that it will 7253 * draw all the pixels overlapping its bounds using a fully opaque color. 7254 * 7255 * Subclasses of View should override this method whenever possible to indicate 7256 * whether an instance is opaque. Opaque Views are treated in a special way by 7257 * the View hierarchy, possibly allowing it to perform optimizations during 7258 * invalidate/draw passes. 7259 * 7260 * @return True if this View is guaranteed to be fully opaque, false otherwise. 7261 */ 7262 @ViewDebug.ExportedProperty(category = "drawing") 7263 public boolean isOpaque() { 7264 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 7265 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 7266 } 7267 7268 /** 7269 * @hide 7270 */ 7271 protected void computeOpaqueFlags() { 7272 // Opaque if: 7273 // - Has a background 7274 // - Background is opaque 7275 // - Doesn't have scrollbars or scrollbars are inside overlay 7276 7277 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 7278 mPrivateFlags |= OPAQUE_BACKGROUND; 7279 } else { 7280 mPrivateFlags &= ~OPAQUE_BACKGROUND; 7281 } 7282 7283 final int flags = mViewFlags; 7284 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 7285 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 7286 mPrivateFlags |= OPAQUE_SCROLLBARS; 7287 } else { 7288 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 7289 } 7290 } 7291 7292 /** 7293 * @hide 7294 */ 7295 protected boolean hasOpaqueScrollbars() { 7296 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 7297 } 7298 7299 /** 7300 * @return A handler associated with the thread running the View. This 7301 * handler can be used to pump events in the UI events queue. 7302 */ 7303 public Handler getHandler() { 7304 if (mAttachInfo != null) { 7305 return mAttachInfo.mHandler; 7306 } 7307 return null; 7308 } 7309 7310 /** 7311 * Causes the Runnable to be added to the message queue. 7312 * The runnable will be run on the user interface thread. 7313 * 7314 * @param action The Runnable that will be executed. 7315 * 7316 * @return Returns true if the Runnable was successfully placed in to the 7317 * message queue. Returns false on failure, usually because the 7318 * looper processing the message queue is exiting. 7319 */ 7320 public boolean post(Runnable action) { 7321 Handler handler; 7322 if (mAttachInfo != null) { 7323 handler = mAttachInfo.mHandler; 7324 } else { 7325 // Assume that post will succeed later 7326 ViewRoot.getRunQueue().post(action); 7327 return true; 7328 } 7329 7330 return handler.post(action); 7331 } 7332 7333 /** 7334 * Causes the Runnable to be added to the message queue, to be run 7335 * after the specified amount of time elapses. 7336 * The runnable will be run on the user interface thread. 7337 * 7338 * @param action The Runnable that will be executed. 7339 * @param delayMillis The delay (in milliseconds) until the Runnable 7340 * will be executed. 7341 * 7342 * @return true if the Runnable was successfully placed in to the 7343 * message queue. Returns false on failure, usually because the 7344 * looper processing the message queue is exiting. Note that a 7345 * result of true does not mean the Runnable will be processed -- 7346 * if the looper is quit before the delivery time of the message 7347 * occurs then the message will be dropped. 7348 */ 7349 public boolean postDelayed(Runnable action, long delayMillis) { 7350 Handler handler; 7351 if (mAttachInfo != null) { 7352 handler = mAttachInfo.mHandler; 7353 } else { 7354 // Assume that post will succeed later 7355 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 7356 return true; 7357 } 7358 7359 return handler.postDelayed(action, delayMillis); 7360 } 7361 7362 /** 7363 * Removes the specified Runnable from the message queue. 7364 * 7365 * @param action The Runnable to remove from the message handling queue 7366 * 7367 * @return true if this view could ask the Handler to remove the Runnable, 7368 * false otherwise. When the returned value is true, the Runnable 7369 * may or may not have been actually removed from the message queue 7370 * (for instance, if the Runnable was not in the queue already.) 7371 */ 7372 public boolean removeCallbacks(Runnable action) { 7373 Handler handler; 7374 if (mAttachInfo != null) { 7375 handler = mAttachInfo.mHandler; 7376 } else { 7377 // Assume that post will succeed later 7378 ViewRoot.getRunQueue().removeCallbacks(action); 7379 return true; 7380 } 7381 7382 handler.removeCallbacks(action); 7383 return true; 7384 } 7385 7386 /** 7387 * Cause an invalidate to happen on a subsequent cycle through the event loop. 7388 * Use this to invalidate the View from a non-UI thread. 7389 * 7390 * @see #invalidate() 7391 */ 7392 public void postInvalidate() { 7393 postInvalidateDelayed(0); 7394 } 7395 7396 /** 7397 * Cause an invalidate of the specified area to happen on a subsequent cycle 7398 * through the event loop. Use this to invalidate the View from a non-UI thread. 7399 * 7400 * @param left The left coordinate of the rectangle to invalidate. 7401 * @param top The top coordinate of the rectangle to invalidate. 7402 * @param right The right coordinate of the rectangle to invalidate. 7403 * @param bottom The bottom coordinate of the rectangle to invalidate. 7404 * 7405 * @see #invalidate(int, int, int, int) 7406 * @see #invalidate(Rect) 7407 */ 7408 public void postInvalidate(int left, int top, int right, int bottom) { 7409 postInvalidateDelayed(0, left, top, right, bottom); 7410 } 7411 7412 /** 7413 * Cause an invalidate to happen on a subsequent cycle through the event 7414 * loop. Waits for the specified amount of time. 7415 * 7416 * @param delayMilliseconds the duration in milliseconds to delay the 7417 * invalidation by 7418 */ 7419 public void postInvalidateDelayed(long delayMilliseconds) { 7420 // We try only with the AttachInfo because there's no point in invalidating 7421 // if we are not attached to our window 7422 if (mAttachInfo != null) { 7423 Message msg = Message.obtain(); 7424 msg.what = AttachInfo.INVALIDATE_MSG; 7425 msg.obj = this; 7426 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 7427 } 7428 } 7429 7430 /** 7431 * Cause an invalidate of the specified area to happen on a subsequent cycle 7432 * through the event loop. Waits for the specified amount of time. 7433 * 7434 * @param delayMilliseconds the duration in milliseconds to delay the 7435 * invalidation by 7436 * @param left The left coordinate of the rectangle to invalidate. 7437 * @param top The top coordinate of the rectangle to invalidate. 7438 * @param right The right coordinate of the rectangle to invalidate. 7439 * @param bottom The bottom coordinate of the rectangle to invalidate. 7440 */ 7441 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 7442 int right, int bottom) { 7443 7444 // We try only with the AttachInfo because there's no point in invalidating 7445 // if we are not attached to our window 7446 if (mAttachInfo != null) { 7447 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 7448 info.target = this; 7449 info.left = left; 7450 info.top = top; 7451 info.right = right; 7452 info.bottom = bottom; 7453 7454 final Message msg = Message.obtain(); 7455 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 7456 msg.obj = info; 7457 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 7458 } 7459 } 7460 7461 /** 7462 * Called by a parent to request that a child update its values for mScrollX 7463 * and mScrollY if necessary. This will typically be done if the child is 7464 * animating a scroll using a {@link android.widget.Scroller Scroller} 7465 * object. 7466 */ 7467 public void computeScroll() { 7468 } 7469 7470 /** 7471 * <p>Indicate whether the horizontal edges are faded when the view is 7472 * scrolled horizontally.</p> 7473 * 7474 * @return true if the horizontal edges should are faded on scroll, false 7475 * otherwise 7476 * 7477 * @see #setHorizontalFadingEdgeEnabled(boolean) 7478 * @attr ref android.R.styleable#View_fadingEdge 7479 */ 7480 public boolean isHorizontalFadingEdgeEnabled() { 7481 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 7482 } 7483 7484 /** 7485 * <p>Define whether the horizontal edges should be faded when this view 7486 * is scrolled horizontally.</p> 7487 * 7488 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 7489 * be faded when the view is scrolled 7490 * horizontally 7491 * 7492 * @see #isHorizontalFadingEdgeEnabled() 7493 * @attr ref android.R.styleable#View_fadingEdge 7494 */ 7495 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 7496 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 7497 if (horizontalFadingEdgeEnabled) { 7498 initScrollCache(); 7499 } 7500 7501 mViewFlags ^= FADING_EDGE_HORIZONTAL; 7502 } 7503 } 7504 7505 /** 7506 * <p>Indicate whether the vertical edges are faded when the view is 7507 * scrolled horizontally.</p> 7508 * 7509 * @return true if the vertical edges should are faded on scroll, false 7510 * otherwise 7511 * 7512 * @see #setVerticalFadingEdgeEnabled(boolean) 7513 * @attr ref android.R.styleable#View_fadingEdge 7514 */ 7515 public boolean isVerticalFadingEdgeEnabled() { 7516 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 7517 } 7518 7519 /** 7520 * <p>Define whether the vertical edges should be faded when this view 7521 * is scrolled vertically.</p> 7522 * 7523 * @param verticalFadingEdgeEnabled true if the vertical edges should 7524 * be faded when the view is scrolled 7525 * vertically 7526 * 7527 * @see #isVerticalFadingEdgeEnabled() 7528 * @attr ref android.R.styleable#View_fadingEdge 7529 */ 7530 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 7531 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 7532 if (verticalFadingEdgeEnabled) { 7533 initScrollCache(); 7534 } 7535 7536 mViewFlags ^= FADING_EDGE_VERTICAL; 7537 } 7538 } 7539 7540 /** 7541 * Returns the strength, or intensity, of the top faded edge. The strength is 7542 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7543 * returns 0.0 or 1.0 but no value in between. 7544 * 7545 * Subclasses should override this method to provide a smoother fade transition 7546 * when scrolling occurs. 7547 * 7548 * @return the intensity of the top fade as a float between 0.0f and 1.0f 7549 */ 7550 protected float getTopFadingEdgeStrength() { 7551 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 7552 } 7553 7554 /** 7555 * Returns the strength, or intensity, of the bottom faded edge. The strength is 7556 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7557 * returns 0.0 or 1.0 but no value in between. 7558 * 7559 * Subclasses should override this method to provide a smoother fade transition 7560 * when scrolling occurs. 7561 * 7562 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 7563 */ 7564 protected float getBottomFadingEdgeStrength() { 7565 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 7566 computeVerticalScrollRange() ? 1.0f : 0.0f; 7567 } 7568 7569 /** 7570 * Returns the strength, or intensity, of the left faded edge. The strength is 7571 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7572 * returns 0.0 or 1.0 but no value in between. 7573 * 7574 * Subclasses should override this method to provide a smoother fade transition 7575 * when scrolling occurs. 7576 * 7577 * @return the intensity of the left fade as a float between 0.0f and 1.0f 7578 */ 7579 protected float getLeftFadingEdgeStrength() { 7580 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 7581 } 7582 7583 /** 7584 * Returns the strength, or intensity, of the right faded edge. The strength is 7585 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7586 * returns 0.0 or 1.0 but no value in between. 7587 * 7588 * Subclasses should override this method to provide a smoother fade transition 7589 * when scrolling occurs. 7590 * 7591 * @return the intensity of the right fade as a float between 0.0f and 1.0f 7592 */ 7593 protected float getRightFadingEdgeStrength() { 7594 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 7595 computeHorizontalScrollRange() ? 1.0f : 0.0f; 7596 } 7597 7598 /** 7599 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 7600 * scrollbar is not drawn by default.</p> 7601 * 7602 * @return true if the horizontal scrollbar should be painted, false 7603 * otherwise 7604 * 7605 * @see #setHorizontalScrollBarEnabled(boolean) 7606 */ 7607 public boolean isHorizontalScrollBarEnabled() { 7608 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7609 } 7610 7611 /** 7612 * <p>Define whether the horizontal scrollbar should be drawn or not. The 7613 * scrollbar is not drawn by default.</p> 7614 * 7615 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 7616 * be painted 7617 * 7618 * @see #isHorizontalScrollBarEnabled() 7619 */ 7620 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 7621 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 7622 mViewFlags ^= SCROLLBARS_HORIZONTAL; 7623 computeOpaqueFlags(); 7624 recomputePadding(); 7625 } 7626 } 7627 7628 /** 7629 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 7630 * scrollbar is not drawn by default.</p> 7631 * 7632 * @return true if the vertical scrollbar should be painted, false 7633 * otherwise 7634 * 7635 * @see #setVerticalScrollBarEnabled(boolean) 7636 */ 7637 public boolean isVerticalScrollBarEnabled() { 7638 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 7639 } 7640 7641 /** 7642 * <p>Define whether the vertical scrollbar should be drawn or not. The 7643 * scrollbar is not drawn by default.</p> 7644 * 7645 * @param verticalScrollBarEnabled true if the vertical scrollbar should 7646 * be painted 7647 * 7648 * @see #isVerticalScrollBarEnabled() 7649 */ 7650 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 7651 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 7652 mViewFlags ^= SCROLLBARS_VERTICAL; 7653 computeOpaqueFlags(); 7654 recomputePadding(); 7655 } 7656 } 7657 7658 /** 7659 * @hide 7660 */ 7661 protected void recomputePadding() { 7662 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 7663 } 7664 7665 /** 7666 * Define whether scrollbars will fade when the view is not scrolling. 7667 * 7668 * @param fadeScrollbars wheter to enable fading 7669 * 7670 */ 7671 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 7672 initScrollCache(); 7673 final ScrollabilityCache scrollabilityCache = mScrollCache; 7674 scrollabilityCache.fadeScrollBars = fadeScrollbars; 7675 if (fadeScrollbars) { 7676 scrollabilityCache.state = ScrollabilityCache.OFF; 7677 } else { 7678 scrollabilityCache.state = ScrollabilityCache.ON; 7679 } 7680 } 7681 7682 /** 7683 * 7684 * Returns true if scrollbars will fade when this view is not scrolling 7685 * 7686 * @return true if scrollbar fading is enabled 7687 */ 7688 public boolean isScrollbarFadingEnabled() { 7689 return mScrollCache != null && mScrollCache.fadeScrollBars; 7690 } 7691 7692 /** 7693 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 7694 * inset. When inset, they add to the padding of the view. And the scrollbars 7695 * can be drawn inside the padding area or on the edge of the view. For example, 7696 * if a view has a background drawable and you want to draw the scrollbars 7697 * inside the padding specified by the drawable, you can use 7698 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 7699 * appear at the edge of the view, ignoring the padding, then you can use 7700 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 7701 * @param style the style of the scrollbars. Should be one of 7702 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 7703 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 7704 * @see #SCROLLBARS_INSIDE_OVERLAY 7705 * @see #SCROLLBARS_INSIDE_INSET 7706 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7707 * @see #SCROLLBARS_OUTSIDE_INSET 7708 */ 7709 public void setScrollBarStyle(int style) { 7710 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 7711 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 7712 computeOpaqueFlags(); 7713 recomputePadding(); 7714 } 7715 } 7716 7717 /** 7718 * <p>Returns the current scrollbar style.</p> 7719 * @return the current scrollbar style 7720 * @see #SCROLLBARS_INSIDE_OVERLAY 7721 * @see #SCROLLBARS_INSIDE_INSET 7722 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7723 * @see #SCROLLBARS_OUTSIDE_INSET 7724 */ 7725 public int getScrollBarStyle() { 7726 return mViewFlags & SCROLLBARS_STYLE_MASK; 7727 } 7728 7729 /** 7730 * <p>Compute the horizontal range that the horizontal scrollbar 7731 * represents.</p> 7732 * 7733 * <p>The range is expressed in arbitrary units that must be the same as the 7734 * units used by {@link #computeHorizontalScrollExtent()} and 7735 * {@link #computeHorizontalScrollOffset()}.</p> 7736 * 7737 * <p>The default range is the drawing width of this view.</p> 7738 * 7739 * @return the total horizontal range represented by the horizontal 7740 * scrollbar 7741 * 7742 * @see #computeHorizontalScrollExtent() 7743 * @see #computeHorizontalScrollOffset() 7744 * @see android.widget.ScrollBarDrawable 7745 */ 7746 protected int computeHorizontalScrollRange() { 7747 return getWidth(); 7748 } 7749 7750 /** 7751 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 7752 * within the horizontal range. This value is used to compute the position 7753 * of the thumb within the scrollbar's track.</p> 7754 * 7755 * <p>The range is expressed in arbitrary units that must be the same as the 7756 * units used by {@link #computeHorizontalScrollRange()} and 7757 * {@link #computeHorizontalScrollExtent()}.</p> 7758 * 7759 * <p>The default offset is the scroll offset of this view.</p> 7760 * 7761 * @return the horizontal offset of the scrollbar's thumb 7762 * 7763 * @see #computeHorizontalScrollRange() 7764 * @see #computeHorizontalScrollExtent() 7765 * @see android.widget.ScrollBarDrawable 7766 */ 7767 protected int computeHorizontalScrollOffset() { 7768 return mScrollX; 7769 } 7770 7771 /** 7772 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 7773 * within the horizontal range. This value is used to compute the length 7774 * of the thumb within the scrollbar's track.</p> 7775 * 7776 * <p>The range is expressed in arbitrary units that must be the same as the 7777 * units used by {@link #computeHorizontalScrollRange()} and 7778 * {@link #computeHorizontalScrollOffset()}.</p> 7779 * 7780 * <p>The default extent is the drawing width of this view.</p> 7781 * 7782 * @return the horizontal extent of the scrollbar's thumb 7783 * 7784 * @see #computeHorizontalScrollRange() 7785 * @see #computeHorizontalScrollOffset() 7786 * @see android.widget.ScrollBarDrawable 7787 */ 7788 protected int computeHorizontalScrollExtent() { 7789 return getWidth(); 7790 } 7791 7792 /** 7793 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 7794 * 7795 * <p>The range is expressed in arbitrary units that must be the same as the 7796 * units used by {@link #computeVerticalScrollExtent()} and 7797 * {@link #computeVerticalScrollOffset()}.</p> 7798 * 7799 * @return the total vertical range represented by the vertical scrollbar 7800 * 7801 * <p>The default range is the drawing height of this view.</p> 7802 * 7803 * @see #computeVerticalScrollExtent() 7804 * @see #computeVerticalScrollOffset() 7805 * @see android.widget.ScrollBarDrawable 7806 */ 7807 protected int computeVerticalScrollRange() { 7808 return getHeight(); 7809 } 7810 7811 /** 7812 * <p>Compute the vertical offset of the vertical scrollbar's thumb 7813 * within the horizontal range. This value is used to compute the position 7814 * of the thumb within the scrollbar's track.</p> 7815 * 7816 * <p>The range is expressed in arbitrary units that must be the same as the 7817 * units used by {@link #computeVerticalScrollRange()} and 7818 * {@link #computeVerticalScrollExtent()}.</p> 7819 * 7820 * <p>The default offset is the scroll offset of this view.</p> 7821 * 7822 * @return the vertical offset of the scrollbar's thumb 7823 * 7824 * @see #computeVerticalScrollRange() 7825 * @see #computeVerticalScrollExtent() 7826 * @see android.widget.ScrollBarDrawable 7827 */ 7828 protected int computeVerticalScrollOffset() { 7829 return mScrollY; 7830 } 7831 7832 /** 7833 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 7834 * within the vertical range. This value is used to compute the length 7835 * of the thumb within the scrollbar's track.</p> 7836 * 7837 * <p>The range is expressed in arbitrary units that must be the same as the 7838 * units used by {@link #computeVerticalScrollRange()} and 7839 * {@link #computeVerticalScrollOffset()}.</p> 7840 * 7841 * <p>The default extent is the drawing height of this view.</p> 7842 * 7843 * @return the vertical extent of the scrollbar's thumb 7844 * 7845 * @see #computeVerticalScrollRange() 7846 * @see #computeVerticalScrollOffset() 7847 * @see android.widget.ScrollBarDrawable 7848 */ 7849 protected int computeVerticalScrollExtent() { 7850 return getHeight(); 7851 } 7852 7853 /** 7854 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 7855 * scrollbars are painted only if they have been awakened first.</p> 7856 * 7857 * @param canvas the canvas on which to draw the scrollbars 7858 * 7859 * @see #awakenScrollBars(int) 7860 */ 7861 protected final void onDrawScrollBars(Canvas canvas) { 7862 // scrollbars are drawn only when the animation is running 7863 final ScrollabilityCache cache = mScrollCache; 7864 if (cache != null) { 7865 7866 int state = cache.state; 7867 7868 if (state == ScrollabilityCache.OFF) { 7869 return; 7870 } 7871 7872 boolean invalidate = false; 7873 7874 if (state == ScrollabilityCache.FADING) { 7875 // We're fading -- get our fade interpolation 7876 if (cache.interpolatorValues == null) { 7877 cache.interpolatorValues = new float[1]; 7878 } 7879 7880 float[] values = cache.interpolatorValues; 7881 7882 // Stops the animation if we're done 7883 if (cache.scrollBarInterpolator.timeToValues(values) == 7884 Interpolator.Result.FREEZE_END) { 7885 cache.state = ScrollabilityCache.OFF; 7886 } else { 7887 cache.scrollBar.setAlpha(Math.round(values[0])); 7888 } 7889 7890 // This will make the scroll bars inval themselves after 7891 // drawing. We only want this when we're fading so that 7892 // we prevent excessive redraws 7893 invalidate = true; 7894 } else { 7895 // We're just on -- but we may have been fading before so 7896 // reset alpha 7897 cache.scrollBar.setAlpha(255); 7898 } 7899 7900 7901 final int viewFlags = mViewFlags; 7902 7903 final boolean drawHorizontalScrollBar = 7904 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7905 final boolean drawVerticalScrollBar = 7906 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 7907 && !isVerticalScrollBarHidden(); 7908 7909 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 7910 final int width = mRight - mLeft; 7911 final int height = mBottom - mTop; 7912 7913 final ScrollBarDrawable scrollBar = cache.scrollBar; 7914 7915 final int scrollX = mScrollX; 7916 final int scrollY = mScrollY; 7917 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 7918 7919 int left, top, right, bottom; 7920 7921 if (drawHorizontalScrollBar) { 7922 int size = scrollBar.getSize(false); 7923 if (size <= 0) { 7924 size = cache.scrollBarSize; 7925 } 7926 7927 scrollBar.setParameters(computeHorizontalScrollRange(), 7928 computeHorizontalScrollOffset(), 7929 computeHorizontalScrollExtent(), false); 7930 final int verticalScrollBarGap = drawVerticalScrollBar ? 7931 getVerticalScrollbarWidth() : 0; 7932 top = scrollY + height - size - (mUserPaddingBottom & inside); 7933 left = scrollX + (mPaddingLeft & inside); 7934 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 7935 bottom = top + size; 7936 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 7937 if (invalidate) { 7938 invalidate(left, top, right, bottom); 7939 } 7940 } 7941 7942 if (drawVerticalScrollBar) { 7943 int size = scrollBar.getSize(true); 7944 if (size <= 0) { 7945 size = cache.scrollBarSize; 7946 } 7947 7948 scrollBar.setParameters(computeVerticalScrollRange(), 7949 computeVerticalScrollOffset(), 7950 computeVerticalScrollExtent(), true); 7951 switch (mVerticalScrollbarPosition) { 7952 default: 7953 case SCROLLBAR_POSITION_DEFAULT: 7954 case SCROLLBAR_POSITION_RIGHT: 7955 left = scrollX + width - size - (mUserPaddingRight & inside); 7956 break; 7957 case SCROLLBAR_POSITION_LEFT: 7958 left = scrollX + (mUserPaddingLeft & inside); 7959 break; 7960 } 7961 top = scrollY + (mPaddingTop & inside); 7962 right = left + size; 7963 bottom = scrollY + height - (mUserPaddingBottom & inside); 7964 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 7965 if (invalidate) { 7966 invalidate(left, top, right, bottom); 7967 } 7968 } 7969 } 7970 } 7971 } 7972 7973 /** 7974 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 7975 * FastScroller is visible. 7976 * @return whether to temporarily hide the vertical scrollbar 7977 * @hide 7978 */ 7979 protected boolean isVerticalScrollBarHidden() { 7980 return false; 7981 } 7982 7983 /** 7984 * <p>Draw the horizontal scrollbar if 7985 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 7986 * 7987 * @param canvas the canvas on which to draw the scrollbar 7988 * @param scrollBar the scrollbar's drawable 7989 * 7990 * @see #isHorizontalScrollBarEnabled() 7991 * @see #computeHorizontalScrollRange() 7992 * @see #computeHorizontalScrollExtent() 7993 * @see #computeHorizontalScrollOffset() 7994 * @see android.widget.ScrollBarDrawable 7995 * @hide 7996 */ 7997 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 7998 int l, int t, int r, int b) { 7999 scrollBar.setBounds(l, t, r, b); 8000 scrollBar.draw(canvas); 8001 } 8002 8003 /** 8004 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 8005 * returns true.</p> 8006 * 8007 * @param canvas the canvas on which to draw the scrollbar 8008 * @param scrollBar the scrollbar's drawable 8009 * 8010 * @see #isVerticalScrollBarEnabled() 8011 * @see #computeVerticalScrollRange() 8012 * @see #computeVerticalScrollExtent() 8013 * @see #computeVerticalScrollOffset() 8014 * @see android.widget.ScrollBarDrawable 8015 * @hide 8016 */ 8017 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 8018 int l, int t, int r, int b) { 8019 scrollBar.setBounds(l, t, r, b); 8020 scrollBar.draw(canvas); 8021 } 8022 8023 /** 8024 * Implement this to do your drawing. 8025 * 8026 * @param canvas the canvas on which the background will be drawn 8027 */ 8028 protected void onDraw(Canvas canvas) { 8029 } 8030 8031 /* 8032 * Caller is responsible for calling requestLayout if necessary. 8033 * (This allows addViewInLayout to not request a new layout.) 8034 */ 8035 void assignParent(ViewParent parent) { 8036 if (mParent == null) { 8037 mParent = parent; 8038 } else if (parent == null) { 8039 mParent = null; 8040 } else { 8041 throw new RuntimeException("view " + this + " being added, but" 8042 + " it already has a parent"); 8043 } 8044 } 8045 8046 /** 8047 * This is called when the view is attached to a window. At this point it 8048 * has a Surface and will start drawing. Note that this function is 8049 * guaranteed to be called before {@link #onDraw}, however it may be called 8050 * any time before the first onDraw -- including before or after 8051 * {@link #onMeasure}. 8052 * 8053 * @see #onDetachedFromWindow() 8054 */ 8055 protected void onAttachedToWindow() { 8056 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 8057 mParent.requestTransparentRegion(this); 8058 } 8059 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 8060 initialAwakenScrollBars(); 8061 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 8062 } 8063 jumpDrawablesToCurrentState(); 8064 } 8065 8066 /** 8067 * This is called when the view is detached from a window. At this point it 8068 * no longer has a surface for drawing. 8069 * 8070 * @see #onAttachedToWindow() 8071 */ 8072 protected void onDetachedFromWindow() { 8073 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 8074 8075 removeUnsetPressCallback(); 8076 removeLongPressCallback(); 8077 removePerformClickCallback(); 8078 8079 destroyDrawingCache(); 8080 8081 if (mHardwareLayer != null) { 8082 mHardwareLayer.destroy(); 8083 mHardwareLayer = null; 8084 } 8085 8086 if (mDisplayList != null) { 8087 mDisplayList.invalidate(); 8088 } 8089 8090 if (mAttachInfo != null) { 8091 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 8092 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_RECT_MSG, this); 8093 } 8094 8095 mCurrentAnimation = null; 8096 } 8097 8098 /** 8099 * @return The number of times this view has been attached to a window 8100 */ 8101 protected int getWindowAttachCount() { 8102 return mWindowAttachCount; 8103 } 8104 8105 /** 8106 * Retrieve a unique token identifying the window this view is attached to. 8107 * @return Return the window's token for use in 8108 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 8109 */ 8110 public IBinder getWindowToken() { 8111 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 8112 } 8113 8114 /** 8115 * Retrieve a unique token identifying the top-level "real" window of 8116 * the window that this view is attached to. That is, this is like 8117 * {@link #getWindowToken}, except if the window this view in is a panel 8118 * window (attached to another containing window), then the token of 8119 * the containing window is returned instead. 8120 * 8121 * @return Returns the associated window token, either 8122 * {@link #getWindowToken()} or the containing window's token. 8123 */ 8124 public IBinder getApplicationWindowToken() { 8125 AttachInfo ai = mAttachInfo; 8126 if (ai != null) { 8127 IBinder appWindowToken = ai.mPanelParentWindowToken; 8128 if (appWindowToken == null) { 8129 appWindowToken = ai.mWindowToken; 8130 } 8131 return appWindowToken; 8132 } 8133 return null; 8134 } 8135 8136 /** 8137 * Retrieve private session object this view hierarchy is using to 8138 * communicate with the window manager. 8139 * @return the session object to communicate with the window manager 8140 */ 8141 /*package*/ IWindowSession getWindowSession() { 8142 return mAttachInfo != null ? mAttachInfo.mSession : null; 8143 } 8144 8145 /** 8146 * @param info the {@link android.view.View.AttachInfo} to associated with 8147 * this view 8148 */ 8149 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 8150 //System.out.println("Attached! " + this); 8151 mAttachInfo = info; 8152 mWindowAttachCount++; 8153 // We will need to evaluate the drawable state at least once. 8154 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 8155 if (mFloatingTreeObserver != null) { 8156 info.mTreeObserver.merge(mFloatingTreeObserver); 8157 mFloatingTreeObserver = null; 8158 } 8159 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 8160 mAttachInfo.mScrollContainers.add(this); 8161 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 8162 } 8163 performCollectViewAttributes(visibility); 8164 onAttachedToWindow(); 8165 8166 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 8167 mOnAttachStateChangeListeners; 8168 if (listeners != null && listeners.size() > 0) { 8169 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 8170 // perform the dispatching. The iterator is a safe guard against listeners that 8171 // could mutate the list by calling the various add/remove methods. This prevents 8172 // the array from being modified while we iterate it. 8173 for (OnAttachStateChangeListener listener : listeners) { 8174 listener.onViewAttachedToWindow(this); 8175 } 8176 } 8177 8178 int vis = info.mWindowVisibility; 8179 if (vis != GONE) { 8180 onWindowVisibilityChanged(vis); 8181 } 8182 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 8183 // If nobody has evaluated the drawable state yet, then do it now. 8184 refreshDrawableState(); 8185 } 8186 } 8187 8188 void dispatchDetachedFromWindow() { 8189 AttachInfo info = mAttachInfo; 8190 if (info != null) { 8191 int vis = info.mWindowVisibility; 8192 if (vis != GONE) { 8193 onWindowVisibilityChanged(GONE); 8194 } 8195 } 8196 8197 onDetachedFromWindow(); 8198 8199 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 8200 mOnAttachStateChangeListeners; 8201 if (listeners != null && listeners.size() > 0) { 8202 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 8203 // perform the dispatching. The iterator is a safe guard against listeners that 8204 // could mutate the list by calling the various add/remove methods. This prevents 8205 // the array from being modified while we iterate it. 8206 for (OnAttachStateChangeListener listener : listeners) { 8207 listener.onViewDetachedFromWindow(this); 8208 } 8209 } 8210 8211 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 8212 mAttachInfo.mScrollContainers.remove(this); 8213 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 8214 } 8215 8216 mAttachInfo = null; 8217 } 8218 8219 /** 8220 * Store this view hierarchy's frozen state into the given container. 8221 * 8222 * @param container The SparseArray in which to save the view's state. 8223 * 8224 * @see #restoreHierarchyState 8225 * @see #dispatchSaveInstanceState 8226 * @see #onSaveInstanceState 8227 */ 8228 public void saveHierarchyState(SparseArray<Parcelable> container) { 8229 dispatchSaveInstanceState(container); 8230 } 8231 8232 /** 8233 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 8234 * May be overridden to modify how freezing happens to a view's children; for example, some 8235 * views may want to not store state for their children. 8236 * 8237 * @param container The SparseArray in which to save the view's state. 8238 * 8239 * @see #dispatchRestoreInstanceState 8240 * @see #saveHierarchyState 8241 * @see #onSaveInstanceState 8242 */ 8243 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 8244 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 8245 mPrivateFlags &= ~SAVE_STATE_CALLED; 8246 Parcelable state = onSaveInstanceState(); 8247 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 8248 throw new IllegalStateException( 8249 "Derived class did not call super.onSaveInstanceState()"); 8250 } 8251 if (state != null) { 8252 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 8253 // + ": " + state); 8254 container.put(mID, state); 8255 } 8256 } 8257 } 8258 8259 /** 8260 * Hook allowing a view to generate a representation of its internal state 8261 * that can later be used to create a new instance with that same state. 8262 * This state should only contain information that is not persistent or can 8263 * not be reconstructed later. For example, you will never store your 8264 * current position on screen because that will be computed again when a 8265 * new instance of the view is placed in its view hierarchy. 8266 * <p> 8267 * Some examples of things you may store here: the current cursor position 8268 * in a text view (but usually not the text itself since that is stored in a 8269 * content provider or other persistent storage), the currently selected 8270 * item in a list view. 8271 * 8272 * @return Returns a Parcelable object containing the view's current dynamic 8273 * state, or null if there is nothing interesting to save. The 8274 * default implementation returns null. 8275 * @see #onRestoreInstanceState 8276 * @see #saveHierarchyState 8277 * @see #dispatchSaveInstanceState 8278 * @see #setSaveEnabled(boolean) 8279 */ 8280 protected Parcelable onSaveInstanceState() { 8281 mPrivateFlags |= SAVE_STATE_CALLED; 8282 return BaseSavedState.EMPTY_STATE; 8283 } 8284 8285 /** 8286 * Restore this view hierarchy's frozen state from the given container. 8287 * 8288 * @param container The SparseArray which holds previously frozen states. 8289 * 8290 * @see #saveHierarchyState 8291 * @see #dispatchRestoreInstanceState 8292 * @see #onRestoreInstanceState 8293 */ 8294 public void restoreHierarchyState(SparseArray<Parcelable> container) { 8295 dispatchRestoreInstanceState(container); 8296 } 8297 8298 /** 8299 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 8300 * children. May be overridden to modify how restoreing happens to a view's children; for 8301 * example, some views may want to not store state for their children. 8302 * 8303 * @param container The SparseArray which holds previously saved state. 8304 * 8305 * @see #dispatchSaveInstanceState 8306 * @see #restoreHierarchyState 8307 * @see #onRestoreInstanceState 8308 */ 8309 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 8310 if (mID != NO_ID) { 8311 Parcelable state = container.get(mID); 8312 if (state != null) { 8313 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 8314 // + ": " + state); 8315 mPrivateFlags &= ~SAVE_STATE_CALLED; 8316 onRestoreInstanceState(state); 8317 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 8318 throw new IllegalStateException( 8319 "Derived class did not call super.onRestoreInstanceState()"); 8320 } 8321 } 8322 } 8323 } 8324 8325 /** 8326 * Hook allowing a view to re-apply a representation of its internal state that had previously 8327 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 8328 * null state. 8329 * 8330 * @param state The frozen state that had previously been returned by 8331 * {@link #onSaveInstanceState}. 8332 * 8333 * @see #onSaveInstanceState 8334 * @see #restoreHierarchyState 8335 * @see #dispatchRestoreInstanceState 8336 */ 8337 protected void onRestoreInstanceState(Parcelable state) { 8338 mPrivateFlags |= SAVE_STATE_CALLED; 8339 if (state != BaseSavedState.EMPTY_STATE && state != null) { 8340 throw new IllegalArgumentException("Wrong state class, expecting View State but " 8341 + "received " + state.getClass().toString() + " instead. This usually happens " 8342 + "when two views of different type have the same id in the same hierarchy. " 8343 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 8344 + "other views do not use the same id."); 8345 } 8346 } 8347 8348 /** 8349 * <p>Return the time at which the drawing of the view hierarchy started.</p> 8350 * 8351 * @return the drawing start time in milliseconds 8352 */ 8353 public long getDrawingTime() { 8354 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 8355 } 8356 8357 /** 8358 * <p>Enables or disables the duplication of the parent's state into this view. When 8359 * duplication is enabled, this view gets its drawable state from its parent rather 8360 * than from its own internal properties.</p> 8361 * 8362 * <p>Note: in the current implementation, setting this property to true after the 8363 * view was added to a ViewGroup might have no effect at all. This property should 8364 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 8365 * 8366 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 8367 * property is enabled, an exception will be thrown.</p> 8368 * 8369 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 8370 * parent, these states should not be affected by this method.</p> 8371 * 8372 * @param enabled True to enable duplication of the parent's drawable state, false 8373 * to disable it. 8374 * 8375 * @see #getDrawableState() 8376 * @see #isDuplicateParentStateEnabled() 8377 */ 8378 public void setDuplicateParentStateEnabled(boolean enabled) { 8379 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 8380 } 8381 8382 /** 8383 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 8384 * 8385 * @return True if this view's drawable state is duplicated from the parent, 8386 * false otherwise 8387 * 8388 * @see #getDrawableState() 8389 * @see #setDuplicateParentStateEnabled(boolean) 8390 */ 8391 public boolean isDuplicateParentStateEnabled() { 8392 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 8393 } 8394 8395 /** 8396 * <p>Specifies the type of layer backing this view. The layer can be 8397 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 8398 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 8399 * 8400 * <p>A layer is associated with an optional {@link android.graphics.Paint} 8401 * instance that controls how the layer is composed on screen. The following 8402 * properties of the paint are taken into account when composing the layer:</p> 8403 * <ul> 8404 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 8405 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 8406 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 8407 * </ul> 8408 * 8409 * <p>If this view has an alpha value set to < 1.0 by calling 8410 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 8411 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 8412 * equivalent to setting a hardware layer on this view and providing a paint with 8413 * the desired alpha value.<p> 8414 * 8415 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 8416 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 8417 * for more information on when and how to use layers.</p> 8418 * 8419 * @param layerType The ype of layer to use with this view, must be one of 8420 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 8421 * {@link #LAYER_TYPE_HARDWARE} 8422 * @param paint The paint used to compose the layer. This argument is optional 8423 * and can be null. It is ignored when the layer type is 8424 * {@link #LAYER_TYPE_NONE} 8425 * 8426 * @see #getLayerType() 8427 * @see #LAYER_TYPE_NONE 8428 * @see #LAYER_TYPE_SOFTWARE 8429 * @see #LAYER_TYPE_HARDWARE 8430 * @see #setAlpha(float) 8431 * 8432 * @attr ref android.R.styleable#View_layerType 8433 */ 8434 public void setLayerType(int layerType, Paint paint) { 8435 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 8436 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 8437 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 8438 } 8439 8440 if (layerType == mLayerType) { 8441 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 8442 mLayerPaint = paint == null ? new Paint() : paint; 8443 invalidateParentCaches(); 8444 invalidate(true); 8445 } 8446 return; 8447 } 8448 8449 // Destroy any previous software drawing cache if needed 8450 switch (mLayerType) { 8451 case LAYER_TYPE_SOFTWARE: 8452 if (mDrawingCache != null) { 8453 mDrawingCache.recycle(); 8454 mDrawingCache = null; 8455 } 8456 8457 if (mUnscaledDrawingCache != null) { 8458 mUnscaledDrawingCache.recycle(); 8459 mUnscaledDrawingCache = null; 8460 } 8461 break; 8462 case LAYER_TYPE_HARDWARE: 8463 if (mHardwareLayer != null) { 8464 mHardwareLayer.destroy(); 8465 mHardwareLayer = null; 8466 } 8467 break; 8468 default: 8469 break; 8470 } 8471 8472 mLayerType = layerType; 8473 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 8474 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 8475 mLocalDirtyRect = layerDisabled ? null : new Rect(); 8476 8477 invalidateParentCaches(); 8478 invalidate(true); 8479 } 8480 8481 /** 8482 * Indicates what type of layer is currently associated with this view. By default 8483 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 8484 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 8485 * for more information on the different types of layers. 8486 * 8487 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 8488 * {@link #LAYER_TYPE_HARDWARE} 8489 * 8490 * @see #setLayerType(int, android.graphics.Paint) 8491 * @see #buildLayer() 8492 * @see #LAYER_TYPE_NONE 8493 * @see #LAYER_TYPE_SOFTWARE 8494 * @see #LAYER_TYPE_HARDWARE 8495 */ 8496 public int getLayerType() { 8497 return mLayerType; 8498 } 8499 8500 /** 8501 * Forces this view's layer to be created and this view to be rendered 8502 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 8503 * invoking this method will have no effect. 8504 * 8505 * This method can for instance be used to render a view into its layer before 8506 * starting an animation. If this view is complex, rendering into the layer 8507 * before starting the animation will avoid skipping frames. 8508 * 8509 * @throws IllegalStateException If this view is not attached to a window 8510 * 8511 * @see #setLayerType(int, android.graphics.Paint) 8512 */ 8513 public void buildLayer() { 8514 if (mLayerType == LAYER_TYPE_NONE) return; 8515 8516 if (mAttachInfo == null) { 8517 throw new IllegalStateException("This view must be attached to a window first"); 8518 } 8519 8520 switch (mLayerType) { 8521 case LAYER_TYPE_HARDWARE: 8522 getHardwareLayer(); 8523 break; 8524 case LAYER_TYPE_SOFTWARE: 8525 buildDrawingCache(true); 8526 break; 8527 } 8528 } 8529 8530 /** 8531 * <p>Returns a hardware layer that can be used to draw this view again 8532 * without executing its draw method.</p> 8533 * 8534 * @return A HardwareLayer ready to render, or null if an error occurred. 8535 */ 8536 HardwareLayer getHardwareLayer() { 8537 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8538 return null; 8539 } 8540 8541 final int width = mRight - mLeft; 8542 final int height = mBottom - mTop; 8543 8544 if (width == 0 || height == 0) { 8545 return null; 8546 } 8547 8548 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 8549 if (mHardwareLayer == null) { 8550 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 8551 width, height, isOpaque()); 8552 mLocalDirtyRect.setEmpty(); 8553 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 8554 mHardwareLayer.resize(width, height); 8555 mLocalDirtyRect.setEmpty(); 8556 } 8557 8558 Canvas currentCanvas = mAttachInfo.mHardwareCanvas; 8559 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 8560 mAttachInfo.mHardwareCanvas = canvas; 8561 try { 8562 canvas.setViewport(width, height); 8563 canvas.onPreDraw(mLocalDirtyRect); 8564 mLocalDirtyRect.setEmpty(); 8565 8566 final int restoreCount = canvas.save(); 8567 8568 computeScroll(); 8569 canvas.translate(-mScrollX, -mScrollY); 8570 8571 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8572 8573 // Fast path for layouts with no backgrounds 8574 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8575 mPrivateFlags &= ~DIRTY_MASK; 8576 dispatchDraw(canvas); 8577 } else { 8578 draw(canvas); 8579 } 8580 8581 canvas.restoreToCount(restoreCount); 8582 } finally { 8583 canvas.onPostDraw(); 8584 mHardwareLayer.end(currentCanvas); 8585 mAttachInfo.mHardwareCanvas = currentCanvas; 8586 } 8587 } 8588 8589 return mHardwareLayer; 8590 } 8591 8592 /** 8593 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 8594 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 8595 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 8596 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 8597 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 8598 * null.</p> 8599 * 8600 * <p>Enabling the drawing cache is similar to 8601 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 8602 * acceleration is turned off. When hardware acceleration is turned on, enabling the 8603 * drawing cache has no effect on rendering because the system uses a different mechanism 8604 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 8605 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 8606 * for information on how to enable software and hardware layers.</p> 8607 * 8608 * <p>This API can be used to manually generate 8609 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 8610 * {@link #getDrawingCache()}.</p> 8611 * 8612 * @param enabled true to enable the drawing cache, false otherwise 8613 * 8614 * @see #isDrawingCacheEnabled() 8615 * @see #getDrawingCache() 8616 * @see #buildDrawingCache() 8617 * @see #setLayerType(int, android.graphics.Paint) 8618 */ 8619 public void setDrawingCacheEnabled(boolean enabled) { 8620 mCachingFailed = false; 8621 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 8622 } 8623 8624 /** 8625 * <p>Indicates whether the drawing cache is enabled for this view.</p> 8626 * 8627 * @return true if the drawing cache is enabled 8628 * 8629 * @see #setDrawingCacheEnabled(boolean) 8630 * @see #getDrawingCache() 8631 */ 8632 @ViewDebug.ExportedProperty(category = "drawing") 8633 public boolean isDrawingCacheEnabled() { 8634 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 8635 } 8636 8637 /** 8638 * Debugging utility which recursively outputs the dirty state of a view and its 8639 * descendants. 8640 * 8641 * @hide 8642 */ 8643 @SuppressWarnings({"UnusedDeclaration"}) 8644 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 8645 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 8646 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 8647 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 8648 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 8649 if (clear) { 8650 mPrivateFlags &= clearMask; 8651 } 8652 if (this instanceof ViewGroup) { 8653 ViewGroup parent = (ViewGroup) this; 8654 final int count = parent.getChildCount(); 8655 for (int i = 0; i < count; i++) { 8656 final View child = parent.getChildAt(i); 8657 child.outputDirtyFlags(indent + " ", clear, clearMask); 8658 } 8659 } 8660 } 8661 8662 /** 8663 * This method is used by ViewGroup to cause its children to restore or recreate their 8664 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 8665 * to recreate its own display list, which would happen if it went through the normal 8666 * draw/dispatchDraw mechanisms. 8667 * 8668 * @hide 8669 */ 8670 protected void dispatchGetDisplayList() {} 8671 8672 /** 8673 * A view that is not attached or hardware accelerated cannot create a display list. 8674 * This method checks these conditions and returns the appropriate result. 8675 * 8676 * @return true if view has the ability to create a display list, false otherwise. 8677 * 8678 * @hide 8679 */ 8680 public boolean canHaveDisplayList() { 8681 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 8682 } 8683 8684 /** 8685 * <p>Returns a display list that can be used to draw this view again 8686 * without executing its draw method.</p> 8687 * 8688 * @return A DisplayList ready to replay, or null if caching is not enabled. 8689 * 8690 * @hide 8691 */ 8692 public DisplayList getDisplayList() { 8693 if (!canHaveDisplayList()) { 8694 return null; 8695 } 8696 8697 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 8698 mDisplayList == null || !mDisplayList.isValid() || 8699 mRecreateDisplayList)) { 8700 // Don't need to recreate the display list, just need to tell our 8701 // children to restore/recreate theirs 8702 if (mDisplayList != null && mDisplayList.isValid() && 8703 !mRecreateDisplayList) { 8704 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8705 mPrivateFlags &= ~DIRTY_MASK; 8706 dispatchGetDisplayList(); 8707 8708 return mDisplayList; 8709 } 8710 8711 // If we got here, we're recreating it. Mark it as such to ensure that 8712 // we copy in child display lists into ours in drawChild() 8713 mRecreateDisplayList = true; 8714 if (mDisplayList == null) { 8715 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(this); 8716 // If we're creating a new display list, make sure our parent gets invalidated 8717 // since they will need to recreate their display list to account for this 8718 // new child display list. 8719 invalidateParentCaches(); 8720 } 8721 8722 final HardwareCanvas canvas = mDisplayList.start(); 8723 try { 8724 int width = mRight - mLeft; 8725 int height = mBottom - mTop; 8726 8727 canvas.setViewport(width, height); 8728 // The dirty rect should always be null for a display list 8729 canvas.onPreDraw(null); 8730 8731 final int restoreCount = canvas.save(); 8732 8733 computeScroll(); 8734 canvas.translate(-mScrollX, -mScrollY); 8735 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8736 8737 // Fast path for layouts with no backgrounds 8738 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8739 mPrivateFlags &= ~DIRTY_MASK; 8740 dispatchDraw(canvas); 8741 } else { 8742 draw(canvas); 8743 } 8744 8745 canvas.restoreToCount(restoreCount); 8746 } finally { 8747 canvas.onPostDraw(); 8748 8749 mDisplayList.end(); 8750 } 8751 } else { 8752 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8753 mPrivateFlags &= ~DIRTY_MASK; 8754 } 8755 8756 return mDisplayList; 8757 } 8758 8759 /** 8760 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 8761 * 8762 * @return A non-scaled bitmap representing this view or null if cache is disabled. 8763 * 8764 * @see #getDrawingCache(boolean) 8765 */ 8766 public Bitmap getDrawingCache() { 8767 return getDrawingCache(false); 8768 } 8769 8770 /** 8771 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 8772 * is null when caching is disabled. If caching is enabled and the cache is not ready, 8773 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 8774 * draw from the cache when the cache is enabled. To benefit from the cache, you must 8775 * request the drawing cache by calling this method and draw it on screen if the 8776 * returned bitmap is not null.</p> 8777 * 8778 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8779 * this method will create a bitmap of the same size as this view. Because this bitmap 8780 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8781 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8782 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8783 * size than the view. This implies that your application must be able to handle this 8784 * size.</p> 8785 * 8786 * @param autoScale Indicates whether the generated bitmap should be scaled based on 8787 * the current density of the screen when the application is in compatibility 8788 * mode. 8789 * 8790 * @return A bitmap representing this view or null if cache is disabled. 8791 * 8792 * @see #setDrawingCacheEnabled(boolean) 8793 * @see #isDrawingCacheEnabled() 8794 * @see #buildDrawingCache(boolean) 8795 * @see #destroyDrawingCache() 8796 */ 8797 public Bitmap getDrawingCache(boolean autoScale) { 8798 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8799 return null; 8800 } 8801 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 8802 buildDrawingCache(autoScale); 8803 } 8804 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 8805 } 8806 8807 /** 8808 * <p>Frees the resources used by the drawing cache. If you call 8809 * {@link #buildDrawingCache()} manually without calling 8810 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8811 * should cleanup the cache with this method afterwards.</p> 8812 * 8813 * @see #setDrawingCacheEnabled(boolean) 8814 * @see #buildDrawingCache() 8815 * @see #getDrawingCache() 8816 */ 8817 public void destroyDrawingCache() { 8818 if (mDrawingCache != null) { 8819 mDrawingCache.recycle(); 8820 mDrawingCache = null; 8821 } 8822 if (mUnscaledDrawingCache != null) { 8823 mUnscaledDrawingCache.recycle(); 8824 mUnscaledDrawingCache = null; 8825 } 8826 } 8827 8828 /** 8829 * Setting a solid background color for the drawing cache's bitmaps will improve 8830 * perfromance and memory usage. Note, though that this should only be used if this 8831 * view will always be drawn on top of a solid color. 8832 * 8833 * @param color The background color to use for the drawing cache's bitmap 8834 * 8835 * @see #setDrawingCacheEnabled(boolean) 8836 * @see #buildDrawingCache() 8837 * @see #getDrawingCache() 8838 */ 8839 public void setDrawingCacheBackgroundColor(int color) { 8840 if (color != mDrawingCacheBackgroundColor) { 8841 mDrawingCacheBackgroundColor = color; 8842 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8843 } 8844 } 8845 8846 /** 8847 * @see #setDrawingCacheBackgroundColor(int) 8848 * 8849 * @return The background color to used for the drawing cache's bitmap 8850 */ 8851 public int getDrawingCacheBackgroundColor() { 8852 return mDrawingCacheBackgroundColor; 8853 } 8854 8855 /** 8856 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 8857 * 8858 * @see #buildDrawingCache(boolean) 8859 */ 8860 public void buildDrawingCache() { 8861 buildDrawingCache(false); 8862 } 8863 8864 /** 8865 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 8866 * 8867 * <p>If you call {@link #buildDrawingCache()} manually without calling 8868 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8869 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 8870 * 8871 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8872 * this method will create a bitmap of the same size as this view. Because this bitmap 8873 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8874 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8875 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8876 * size than the view. This implies that your application must be able to handle this 8877 * size.</p> 8878 * 8879 * <p>You should avoid calling this method when hardware acceleration is enabled. If 8880 * you do not need the drawing cache bitmap, calling this method will increase memory 8881 * usage and cause the view to be rendered in software once, thus negatively impacting 8882 * performance.</p> 8883 * 8884 * @see #getDrawingCache() 8885 * @see #destroyDrawingCache() 8886 */ 8887 public void buildDrawingCache(boolean autoScale) { 8888 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 8889 mDrawingCache == null : mUnscaledDrawingCache == null)) { 8890 mCachingFailed = false; 8891 8892 if (ViewDebug.TRACE_HIERARCHY) { 8893 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 8894 } 8895 8896 int width = mRight - mLeft; 8897 int height = mBottom - mTop; 8898 8899 final AttachInfo attachInfo = mAttachInfo; 8900 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 8901 8902 if (autoScale && scalingRequired) { 8903 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 8904 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 8905 } 8906 8907 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 8908 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 8909 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 8910 8911 if (width <= 0 || height <= 0 || 8912 // Projected bitmap size in bytes 8913 (width * height * (opaque && !use32BitCache ? 2 : 4) > 8914 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 8915 destroyDrawingCache(); 8916 mCachingFailed = true; 8917 return; 8918 } 8919 8920 boolean clear = true; 8921 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 8922 8923 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 8924 Bitmap.Config quality; 8925 if (!opaque) { 8926 // Never pick ARGB_4444 because it looks awful 8927 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 8928 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 8929 case DRAWING_CACHE_QUALITY_AUTO: 8930 quality = Bitmap.Config.ARGB_8888; 8931 break; 8932 case DRAWING_CACHE_QUALITY_LOW: 8933 quality = Bitmap.Config.ARGB_8888; 8934 break; 8935 case DRAWING_CACHE_QUALITY_HIGH: 8936 quality = Bitmap.Config.ARGB_8888; 8937 break; 8938 default: 8939 quality = Bitmap.Config.ARGB_8888; 8940 break; 8941 } 8942 } else { 8943 // Optimization for translucent windows 8944 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 8945 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 8946 } 8947 8948 // Try to cleanup memory 8949 if (bitmap != null) bitmap.recycle(); 8950 8951 try { 8952 bitmap = Bitmap.createBitmap(width, height, quality); 8953 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8954 if (autoScale) { 8955 mDrawingCache = bitmap; 8956 } else { 8957 mUnscaledDrawingCache = bitmap; 8958 } 8959 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 8960 } catch (OutOfMemoryError e) { 8961 // If there is not enough memory to create the bitmap cache, just 8962 // ignore the issue as bitmap caches are not required to draw the 8963 // view hierarchy 8964 if (autoScale) { 8965 mDrawingCache = null; 8966 } else { 8967 mUnscaledDrawingCache = null; 8968 } 8969 mCachingFailed = true; 8970 return; 8971 } 8972 8973 clear = drawingCacheBackgroundColor != 0; 8974 } 8975 8976 Canvas canvas; 8977 if (attachInfo != null) { 8978 canvas = attachInfo.mCanvas; 8979 if (canvas == null) { 8980 canvas = new Canvas(); 8981 } 8982 canvas.setBitmap(bitmap); 8983 // Temporarily clobber the cached Canvas in case one of our children 8984 // is also using a drawing cache. Without this, the children would 8985 // steal the canvas by attaching their own bitmap to it and bad, bad 8986 // thing would happen (invisible views, corrupted drawings, etc.) 8987 attachInfo.mCanvas = null; 8988 } else { 8989 // This case should hopefully never or seldom happen 8990 canvas = new Canvas(bitmap); 8991 } 8992 8993 if (clear) { 8994 bitmap.eraseColor(drawingCacheBackgroundColor); 8995 } 8996 8997 computeScroll(); 8998 final int restoreCount = canvas.save(); 8999 9000 if (autoScale && scalingRequired) { 9001 final float scale = attachInfo.mApplicationScale; 9002 canvas.scale(scale, scale); 9003 } 9004 9005 canvas.translate(-mScrollX, -mScrollY); 9006 9007 mPrivateFlags |= DRAWN; 9008 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 9009 mLayerType != LAYER_TYPE_NONE) { 9010 mPrivateFlags |= DRAWING_CACHE_VALID; 9011 } 9012 9013 // Fast path for layouts with no backgrounds 9014 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9015 if (ViewDebug.TRACE_HIERARCHY) { 9016 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 9017 } 9018 mPrivateFlags &= ~DIRTY_MASK; 9019 dispatchDraw(canvas); 9020 } else { 9021 draw(canvas); 9022 } 9023 9024 canvas.restoreToCount(restoreCount); 9025 9026 if (attachInfo != null) { 9027 // Restore the cached Canvas for our siblings 9028 attachInfo.mCanvas = canvas; 9029 } 9030 } 9031 } 9032 9033 /** 9034 * Create a snapshot of the view into a bitmap. We should probably make 9035 * some form of this public, but should think about the API. 9036 */ 9037 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 9038 int width = mRight - mLeft; 9039 int height = mBottom - mTop; 9040 9041 final AttachInfo attachInfo = mAttachInfo; 9042 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 9043 width = (int) ((width * scale) + 0.5f); 9044 height = (int) ((height * scale) + 0.5f); 9045 9046 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 9047 if (bitmap == null) { 9048 throw new OutOfMemoryError(); 9049 } 9050 9051 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 9052 9053 Canvas canvas; 9054 if (attachInfo != null) { 9055 canvas = attachInfo.mCanvas; 9056 if (canvas == null) { 9057 canvas = new Canvas(); 9058 } 9059 canvas.setBitmap(bitmap); 9060 // Temporarily clobber the cached Canvas in case one of our children 9061 // is also using a drawing cache. Without this, the children would 9062 // steal the canvas by attaching their own bitmap to it and bad, bad 9063 // things would happen (invisible views, corrupted drawings, etc.) 9064 attachInfo.mCanvas = null; 9065 } else { 9066 // This case should hopefully never or seldom happen 9067 canvas = new Canvas(bitmap); 9068 } 9069 9070 if ((backgroundColor & 0xff000000) != 0) { 9071 bitmap.eraseColor(backgroundColor); 9072 } 9073 9074 computeScroll(); 9075 final int restoreCount = canvas.save(); 9076 canvas.scale(scale, scale); 9077 canvas.translate(-mScrollX, -mScrollY); 9078 9079 // Temporarily remove the dirty mask 9080 int flags = mPrivateFlags; 9081 mPrivateFlags &= ~DIRTY_MASK; 9082 9083 // Fast path for layouts with no backgrounds 9084 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9085 dispatchDraw(canvas); 9086 } else { 9087 draw(canvas); 9088 } 9089 9090 mPrivateFlags = flags; 9091 9092 canvas.restoreToCount(restoreCount); 9093 9094 if (attachInfo != null) { 9095 // Restore the cached Canvas for our siblings 9096 attachInfo.mCanvas = canvas; 9097 } 9098 9099 return bitmap; 9100 } 9101 9102 /** 9103 * Indicates whether this View is currently in edit mode. A View is usually 9104 * in edit mode when displayed within a developer tool. For instance, if 9105 * this View is being drawn by a visual user interface builder, this method 9106 * should return true. 9107 * 9108 * Subclasses should check the return value of this method to provide 9109 * different behaviors if their normal behavior might interfere with the 9110 * host environment. For instance: the class spawns a thread in its 9111 * constructor, the drawing code relies on device-specific features, etc. 9112 * 9113 * This method is usually checked in the drawing code of custom widgets. 9114 * 9115 * @return True if this View is in edit mode, false otherwise. 9116 */ 9117 public boolean isInEditMode() { 9118 return false; 9119 } 9120 9121 /** 9122 * If the View draws content inside its padding and enables fading edges, 9123 * it needs to support padding offsets. Padding offsets are added to the 9124 * fading edges to extend the length of the fade so that it covers pixels 9125 * drawn inside the padding. 9126 * 9127 * Subclasses of this class should override this method if they need 9128 * to draw content inside the padding. 9129 * 9130 * @return True if padding offset must be applied, false otherwise. 9131 * 9132 * @see #getLeftPaddingOffset() 9133 * @see #getRightPaddingOffset() 9134 * @see #getTopPaddingOffset() 9135 * @see #getBottomPaddingOffset() 9136 * 9137 * @since CURRENT 9138 */ 9139 protected boolean isPaddingOffsetRequired() { 9140 return false; 9141 } 9142 9143 /** 9144 * Amount by which to extend the left fading region. Called only when 9145 * {@link #isPaddingOffsetRequired()} returns true. 9146 * 9147 * @return The left padding offset in pixels. 9148 * 9149 * @see #isPaddingOffsetRequired() 9150 * 9151 * @since CURRENT 9152 */ 9153 protected int getLeftPaddingOffset() { 9154 return 0; 9155 } 9156 9157 /** 9158 * Amount by which to extend the right fading region. Called only when 9159 * {@link #isPaddingOffsetRequired()} returns true. 9160 * 9161 * @return The right padding offset in pixels. 9162 * 9163 * @see #isPaddingOffsetRequired() 9164 * 9165 * @since CURRENT 9166 */ 9167 protected int getRightPaddingOffset() { 9168 return 0; 9169 } 9170 9171 /** 9172 * Amount by which to extend the top fading region. Called only when 9173 * {@link #isPaddingOffsetRequired()} returns true. 9174 * 9175 * @return The top padding offset in pixels. 9176 * 9177 * @see #isPaddingOffsetRequired() 9178 * 9179 * @since CURRENT 9180 */ 9181 protected int getTopPaddingOffset() { 9182 return 0; 9183 } 9184 9185 /** 9186 * Amount by which to extend the bottom fading region. Called only when 9187 * {@link #isPaddingOffsetRequired()} returns true. 9188 * 9189 * @return The bottom padding offset in pixels. 9190 * 9191 * @see #isPaddingOffsetRequired() 9192 * 9193 * @since CURRENT 9194 */ 9195 protected int getBottomPaddingOffset() { 9196 return 0; 9197 } 9198 9199 /** 9200 * <p>Indicates whether this view is attached to an hardware accelerated 9201 * window or not.</p> 9202 * 9203 * <p>Even if this method returns true, it does not mean that every call 9204 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 9205 * accelerated {@link android.graphics.Canvas}. For instance, if this view 9206 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 9207 * window is hardware accelerated, 9208 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 9209 * return false, and this method will return true.</p> 9210 * 9211 * @return True if the view is attached to a window and the window is 9212 * hardware accelerated; false in any other case. 9213 */ 9214 public boolean isHardwareAccelerated() { 9215 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 9216 } 9217 9218 /** 9219 * Manually render this view (and all of its children) to the given Canvas. 9220 * The view must have already done a full layout before this function is 9221 * called. When implementing a view, implement {@link #onDraw} instead of 9222 * overriding this method. If you do need to override this method, call 9223 * the superclass version. 9224 * 9225 * @param canvas The Canvas to which the View is rendered. 9226 */ 9227 public void draw(Canvas canvas) { 9228 if (ViewDebug.TRACE_HIERARCHY) { 9229 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 9230 } 9231 9232 final int privateFlags = mPrivateFlags; 9233 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 9234 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 9235 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 9236 9237 /* 9238 * Draw traversal performs several drawing steps which must be executed 9239 * in the appropriate order: 9240 * 9241 * 1. Draw the background 9242 * 2. If necessary, save the canvas' layers to prepare for fading 9243 * 3. Draw view's content 9244 * 4. Draw children 9245 * 5. If necessary, draw the fading edges and restore layers 9246 * 6. Draw decorations (scrollbars for instance) 9247 */ 9248 9249 // Step 1, draw the background, if needed 9250 int saveCount; 9251 9252 if (!dirtyOpaque) { 9253 final Drawable background = mBGDrawable; 9254 if (background != null) { 9255 final int scrollX = mScrollX; 9256 final int scrollY = mScrollY; 9257 9258 if (mBackgroundSizeChanged) { 9259 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 9260 mBackgroundSizeChanged = false; 9261 } 9262 9263 if ((scrollX | scrollY) == 0) { 9264 background.draw(canvas); 9265 } else { 9266 canvas.translate(scrollX, scrollY); 9267 background.draw(canvas); 9268 canvas.translate(-scrollX, -scrollY); 9269 } 9270 } 9271 } 9272 9273 // skip step 2 & 5 if possible (common case) 9274 final int viewFlags = mViewFlags; 9275 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 9276 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 9277 if (!verticalEdges && !horizontalEdges) { 9278 // Step 3, draw the content 9279 if (!dirtyOpaque) onDraw(canvas); 9280 9281 // Step 4, draw the children 9282 dispatchDraw(canvas); 9283 9284 // Step 6, draw decorations (scrollbars) 9285 onDrawScrollBars(canvas); 9286 9287 // we're done... 9288 return; 9289 } 9290 9291 /* 9292 * Here we do the full fledged routine... 9293 * (this is an uncommon case where speed matters less, 9294 * this is why we repeat some of the tests that have been 9295 * done above) 9296 */ 9297 9298 boolean drawTop = false; 9299 boolean drawBottom = false; 9300 boolean drawLeft = false; 9301 boolean drawRight = false; 9302 9303 float topFadeStrength = 0.0f; 9304 float bottomFadeStrength = 0.0f; 9305 float leftFadeStrength = 0.0f; 9306 float rightFadeStrength = 0.0f; 9307 9308 // Step 2, save the canvas' layers 9309 int paddingLeft = mPaddingLeft; 9310 int paddingTop = mPaddingTop; 9311 9312 final boolean offsetRequired = isPaddingOffsetRequired(); 9313 if (offsetRequired) { 9314 paddingLeft += getLeftPaddingOffset(); 9315 paddingTop += getTopPaddingOffset(); 9316 } 9317 9318 int left = mScrollX + paddingLeft; 9319 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 9320 int top = mScrollY + paddingTop; 9321 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 9322 9323 if (offsetRequired) { 9324 right += getRightPaddingOffset(); 9325 bottom += getBottomPaddingOffset(); 9326 } 9327 9328 final ScrollabilityCache scrollabilityCache = mScrollCache; 9329 int length = scrollabilityCache.fadingEdgeLength; 9330 9331 // clip the fade length if top and bottom fades overlap 9332 // overlapping fades produce odd-looking artifacts 9333 if (verticalEdges && (top + length > bottom - length)) { 9334 length = (bottom - top) / 2; 9335 } 9336 9337 // also clip horizontal fades if necessary 9338 if (horizontalEdges && (left + length > right - length)) { 9339 length = (right - left) / 2; 9340 } 9341 9342 if (verticalEdges) { 9343 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 9344 drawTop = topFadeStrength > 0.0f; 9345 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 9346 drawBottom = bottomFadeStrength > 0.0f; 9347 } 9348 9349 if (horizontalEdges) { 9350 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 9351 drawLeft = leftFadeStrength > 0.0f; 9352 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 9353 drawRight = rightFadeStrength > 0.0f; 9354 } 9355 9356 saveCount = canvas.getSaveCount(); 9357 9358 int solidColor = getSolidColor(); 9359 if (solidColor == 0) { 9360 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 9361 9362 if (drawTop) { 9363 canvas.saveLayer(left, top, right, top + length, null, flags); 9364 } 9365 9366 if (drawBottom) { 9367 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 9368 } 9369 9370 if (drawLeft) { 9371 canvas.saveLayer(left, top, left + length, bottom, null, flags); 9372 } 9373 9374 if (drawRight) { 9375 canvas.saveLayer(right - length, top, right, bottom, null, flags); 9376 } 9377 } else { 9378 scrollabilityCache.setFadeColor(solidColor); 9379 } 9380 9381 // Step 3, draw the content 9382 if (!dirtyOpaque) onDraw(canvas); 9383 9384 // Step 4, draw the children 9385 dispatchDraw(canvas); 9386 9387 // Step 5, draw the fade effect and restore layers 9388 final Paint p = scrollabilityCache.paint; 9389 final Matrix matrix = scrollabilityCache.matrix; 9390 final Shader fade = scrollabilityCache.shader; 9391 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 9392 9393 if (drawTop) { 9394 matrix.setScale(1, fadeHeight * topFadeStrength); 9395 matrix.postTranslate(left, top); 9396 fade.setLocalMatrix(matrix); 9397 canvas.drawRect(left, top, right, top + length, p); 9398 } 9399 9400 if (drawBottom) { 9401 matrix.setScale(1, fadeHeight * bottomFadeStrength); 9402 matrix.postRotate(180); 9403 matrix.postTranslate(left, bottom); 9404 fade.setLocalMatrix(matrix); 9405 canvas.drawRect(left, bottom - length, right, bottom, p); 9406 } 9407 9408 if (drawLeft) { 9409 matrix.setScale(1, fadeHeight * leftFadeStrength); 9410 matrix.postRotate(-90); 9411 matrix.postTranslate(left, top); 9412 fade.setLocalMatrix(matrix); 9413 canvas.drawRect(left, top, left + length, bottom, p); 9414 } 9415 9416 if (drawRight) { 9417 matrix.setScale(1, fadeHeight * rightFadeStrength); 9418 matrix.postRotate(90); 9419 matrix.postTranslate(right, top); 9420 fade.setLocalMatrix(matrix); 9421 canvas.drawRect(right - length, top, right, bottom, p); 9422 } 9423 9424 canvas.restoreToCount(saveCount); 9425 9426 // Step 6, draw decorations (scrollbars) 9427 onDrawScrollBars(canvas); 9428 } 9429 9430 /** 9431 * Override this if your view is known to always be drawn on top of a solid color background, 9432 * and needs to draw fading edges. Returning a non-zero color enables the view system to 9433 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 9434 * should be set to 0xFF. 9435 * 9436 * @see #setVerticalFadingEdgeEnabled 9437 * @see #setHorizontalFadingEdgeEnabled 9438 * 9439 * @return The known solid color background for this view, or 0 if the color may vary 9440 */ 9441 public int getSolidColor() { 9442 return 0; 9443 } 9444 9445 /** 9446 * Build a human readable string representation of the specified view flags. 9447 * 9448 * @param flags the view flags to convert to a string 9449 * @return a String representing the supplied flags 9450 */ 9451 private static String printFlags(int flags) { 9452 String output = ""; 9453 int numFlags = 0; 9454 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 9455 output += "TAKES_FOCUS"; 9456 numFlags++; 9457 } 9458 9459 switch (flags & VISIBILITY_MASK) { 9460 case INVISIBLE: 9461 if (numFlags > 0) { 9462 output += " "; 9463 } 9464 output += "INVISIBLE"; 9465 // USELESS HERE numFlags++; 9466 break; 9467 case GONE: 9468 if (numFlags > 0) { 9469 output += " "; 9470 } 9471 output += "GONE"; 9472 // USELESS HERE numFlags++; 9473 break; 9474 default: 9475 break; 9476 } 9477 return output; 9478 } 9479 9480 /** 9481 * Build a human readable string representation of the specified private 9482 * view flags. 9483 * 9484 * @param privateFlags the private view flags to convert to a string 9485 * @return a String representing the supplied flags 9486 */ 9487 private static String printPrivateFlags(int privateFlags) { 9488 String output = ""; 9489 int numFlags = 0; 9490 9491 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 9492 output += "WANTS_FOCUS"; 9493 numFlags++; 9494 } 9495 9496 if ((privateFlags & FOCUSED) == FOCUSED) { 9497 if (numFlags > 0) { 9498 output += " "; 9499 } 9500 output += "FOCUSED"; 9501 numFlags++; 9502 } 9503 9504 if ((privateFlags & SELECTED) == SELECTED) { 9505 if (numFlags > 0) { 9506 output += " "; 9507 } 9508 output += "SELECTED"; 9509 numFlags++; 9510 } 9511 9512 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 9513 if (numFlags > 0) { 9514 output += " "; 9515 } 9516 output += "IS_ROOT_NAMESPACE"; 9517 numFlags++; 9518 } 9519 9520 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 9521 if (numFlags > 0) { 9522 output += " "; 9523 } 9524 output += "HAS_BOUNDS"; 9525 numFlags++; 9526 } 9527 9528 if ((privateFlags & DRAWN) == DRAWN) { 9529 if (numFlags > 0) { 9530 output += " "; 9531 } 9532 output += "DRAWN"; 9533 // USELESS HERE numFlags++; 9534 } 9535 return output; 9536 } 9537 9538 /** 9539 * <p>Indicates whether or not this view's layout will be requested during 9540 * the next hierarchy layout pass.</p> 9541 * 9542 * @return true if the layout will be forced during next layout pass 9543 */ 9544 public boolean isLayoutRequested() { 9545 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 9546 } 9547 9548 /** 9549 * Assign a size and position to a view and all of its 9550 * descendants 9551 * 9552 * <p>This is the second phase of the layout mechanism. 9553 * (The first is measuring). In this phase, each parent calls 9554 * layout on all of its children to position them. 9555 * This is typically done using the child measurements 9556 * that were stored in the measure pass().</p> 9557 * 9558 * <p>Derived classes should not override this method. 9559 * Derived classes with children should override 9560 * onLayout. In that method, they should 9561 * call layout on each of their children.</p> 9562 * 9563 * @param l Left position, relative to parent 9564 * @param t Top position, relative to parent 9565 * @param r Right position, relative to parent 9566 * @param b Bottom position, relative to parent 9567 */ 9568 @SuppressWarnings({"unchecked"}) 9569 public void layout(int l, int t, int r, int b) { 9570 int oldL = mLeft; 9571 int oldT = mTop; 9572 int oldB = mBottom; 9573 int oldR = mRight; 9574 boolean changed = setFrame(l, t, r, b); 9575 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 9576 if (ViewDebug.TRACE_HIERARCHY) { 9577 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 9578 } 9579 9580 onLayout(changed, l, t, r, b); 9581 mPrivateFlags &= ~LAYOUT_REQUIRED; 9582 9583 if (mOnLayoutChangeListeners != null) { 9584 ArrayList<OnLayoutChangeListener> listenersCopy = 9585 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 9586 int numListeners = listenersCopy.size(); 9587 for (int i = 0; i < numListeners; ++i) { 9588 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 9589 } 9590 } 9591 } 9592 mPrivateFlags &= ~FORCE_LAYOUT; 9593 } 9594 9595 /** 9596 * Called from layout when this view should 9597 * assign a size and position to each of its children. 9598 * 9599 * Derived classes with children should override 9600 * this method and call layout on each of 9601 * their children. 9602 * @param changed This is a new size or position for this view 9603 * @param left Left position, relative to parent 9604 * @param top Top position, relative to parent 9605 * @param right Right position, relative to parent 9606 * @param bottom Bottom position, relative to parent 9607 */ 9608 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 9609 } 9610 9611 /** 9612 * Assign a size and position to this view. 9613 * 9614 * This is called from layout. 9615 * 9616 * @param left Left position, relative to parent 9617 * @param top Top position, relative to parent 9618 * @param right Right position, relative to parent 9619 * @param bottom Bottom position, relative to parent 9620 * @return true if the new size and position are different than the 9621 * previous ones 9622 * {@hide} 9623 */ 9624 protected boolean setFrame(int left, int top, int right, int bottom) { 9625 boolean changed = false; 9626 9627 if (DBG) { 9628 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 9629 + right + "," + bottom + ")"); 9630 } 9631 9632 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 9633 changed = true; 9634 9635 // Remember our drawn bit 9636 int drawn = mPrivateFlags & DRAWN; 9637 9638 // Invalidate our old position 9639 invalidate(true); 9640 9641 9642 int oldWidth = mRight - mLeft; 9643 int oldHeight = mBottom - mTop; 9644 9645 mLeft = left; 9646 mTop = top; 9647 mRight = right; 9648 mBottom = bottom; 9649 9650 mPrivateFlags |= HAS_BOUNDS; 9651 9652 int newWidth = right - left; 9653 int newHeight = bottom - top; 9654 9655 if (newWidth != oldWidth || newHeight != oldHeight) { 9656 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9657 // A change in dimension means an auto-centered pivot point changes, too 9658 mMatrixDirty = true; 9659 } 9660 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 9661 } 9662 9663 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 9664 // If we are visible, force the DRAWN bit to on so that 9665 // this invalidate will go through (at least to our parent). 9666 // This is because someone may have invalidated this view 9667 // before this call to setFrame came in, thereby clearing 9668 // the DRAWN bit. 9669 mPrivateFlags |= DRAWN; 9670 invalidate(true); 9671 // parent display list may need to be recreated based on a change in the bounds 9672 // of any child 9673 invalidateParentCaches(); 9674 } 9675 9676 // Reset drawn bit to original value (invalidate turns it off) 9677 mPrivateFlags |= drawn; 9678 9679 mBackgroundSizeChanged = true; 9680 } 9681 return changed; 9682 } 9683 9684 /** 9685 * Finalize inflating a view from XML. This is called as the last phase 9686 * of inflation, after all child views have been added. 9687 * 9688 * <p>Even if the subclass overrides onFinishInflate, they should always be 9689 * sure to call the super method, so that we get called. 9690 */ 9691 protected void onFinishInflate() { 9692 } 9693 9694 /** 9695 * Returns the resources associated with this view. 9696 * 9697 * @return Resources object. 9698 */ 9699 public Resources getResources() { 9700 return mResources; 9701 } 9702 9703 /** 9704 * Invalidates the specified Drawable. 9705 * 9706 * @param drawable the drawable to invalidate 9707 */ 9708 public void invalidateDrawable(Drawable drawable) { 9709 if (verifyDrawable(drawable)) { 9710 final Rect dirty = drawable.getBounds(); 9711 final int scrollX = mScrollX; 9712 final int scrollY = mScrollY; 9713 9714 invalidate(dirty.left + scrollX, dirty.top + scrollY, 9715 dirty.right + scrollX, dirty.bottom + scrollY); 9716 } 9717 } 9718 9719 /** 9720 * Schedules an action on a drawable to occur at a specified time. 9721 * 9722 * @param who the recipient of the action 9723 * @param what the action to run on the drawable 9724 * @param when the time at which the action must occur. Uses the 9725 * {@link SystemClock#uptimeMillis} timebase. 9726 */ 9727 public void scheduleDrawable(Drawable who, Runnable what, long when) { 9728 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9729 mAttachInfo.mHandler.postAtTime(what, who, when); 9730 } 9731 } 9732 9733 /** 9734 * Cancels a scheduled action on a drawable. 9735 * 9736 * @param who the recipient of the action 9737 * @param what the action to cancel 9738 */ 9739 public void unscheduleDrawable(Drawable who, Runnable what) { 9740 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9741 mAttachInfo.mHandler.removeCallbacks(what, who); 9742 } 9743 } 9744 9745 /** 9746 * Unschedule any events associated with the given Drawable. This can be 9747 * used when selecting a new Drawable into a view, so that the previous 9748 * one is completely unscheduled. 9749 * 9750 * @param who The Drawable to unschedule. 9751 * 9752 * @see #drawableStateChanged 9753 */ 9754 public void unscheduleDrawable(Drawable who) { 9755 if (mAttachInfo != null) { 9756 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 9757 } 9758 } 9759 9760 /** 9761 * If your view subclass is displaying its own Drawable objects, it should 9762 * override this function and return true for any Drawable it is 9763 * displaying. This allows animations for those drawables to be 9764 * scheduled. 9765 * 9766 * <p>Be sure to call through to the super class when overriding this 9767 * function. 9768 * 9769 * @param who The Drawable to verify. Return true if it is one you are 9770 * displaying, else return the result of calling through to the 9771 * super class. 9772 * 9773 * @return boolean If true than the Drawable is being displayed in the 9774 * view; else false and it is not allowed to animate. 9775 * 9776 * @see #unscheduleDrawable 9777 * @see #drawableStateChanged 9778 */ 9779 protected boolean verifyDrawable(Drawable who) { 9780 return who == mBGDrawable; 9781 } 9782 9783 /** 9784 * This function is called whenever the state of the view changes in such 9785 * a way that it impacts the state of drawables being shown. 9786 * 9787 * <p>Be sure to call through to the superclass when overriding this 9788 * function. 9789 * 9790 * @see Drawable#setState 9791 */ 9792 protected void drawableStateChanged() { 9793 Drawable d = mBGDrawable; 9794 if (d != null && d.isStateful()) { 9795 d.setState(getDrawableState()); 9796 } 9797 } 9798 9799 /** 9800 * Call this to force a view to update its drawable state. This will cause 9801 * drawableStateChanged to be called on this view. Views that are interested 9802 * in the new state should call getDrawableState. 9803 * 9804 * @see #drawableStateChanged 9805 * @see #getDrawableState 9806 */ 9807 public void refreshDrawableState() { 9808 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9809 drawableStateChanged(); 9810 9811 ViewParent parent = mParent; 9812 if (parent != null) { 9813 parent.childDrawableStateChanged(this); 9814 } 9815 } 9816 9817 /** 9818 * Return an array of resource IDs of the drawable states representing the 9819 * current state of the view. 9820 * 9821 * @return The current drawable state 9822 * 9823 * @see Drawable#setState 9824 * @see #drawableStateChanged 9825 * @see #onCreateDrawableState 9826 */ 9827 public final int[] getDrawableState() { 9828 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 9829 return mDrawableState; 9830 } else { 9831 mDrawableState = onCreateDrawableState(0); 9832 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 9833 return mDrawableState; 9834 } 9835 } 9836 9837 /** 9838 * Generate the new {@link android.graphics.drawable.Drawable} state for 9839 * this view. This is called by the view 9840 * system when the cached Drawable state is determined to be invalid. To 9841 * retrieve the current state, you should use {@link #getDrawableState}. 9842 * 9843 * @param extraSpace if non-zero, this is the number of extra entries you 9844 * would like in the returned array in which you can place your own 9845 * states. 9846 * 9847 * @return Returns an array holding the current {@link Drawable} state of 9848 * the view. 9849 * 9850 * @see #mergeDrawableStates 9851 */ 9852 protected int[] onCreateDrawableState(int extraSpace) { 9853 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 9854 mParent instanceof View) { 9855 return ((View) mParent).onCreateDrawableState(extraSpace); 9856 } 9857 9858 int[] drawableState; 9859 9860 int privateFlags = mPrivateFlags; 9861 9862 int viewStateIndex = 0; 9863 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 9864 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 9865 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 9866 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 9867 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 9868 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 9869 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested) { 9870 // This is set if HW acceleration is requested, even if the current 9871 // process doesn't allow it. This is just to allow app preview 9872 // windows to better match their app. 9873 viewStateIndex |= VIEW_STATE_ACCELERATED; 9874 } 9875 9876 drawableState = VIEW_STATE_SETS[viewStateIndex]; 9877 9878 //noinspection ConstantIfStatement 9879 if (false) { 9880 Log.i("View", "drawableStateIndex=" + viewStateIndex); 9881 Log.i("View", toString() 9882 + " pressed=" + ((privateFlags & PRESSED) != 0) 9883 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 9884 + " fo=" + hasFocus() 9885 + " sl=" + ((privateFlags & SELECTED) != 0) 9886 + " wf=" + hasWindowFocus() 9887 + ": " + Arrays.toString(drawableState)); 9888 } 9889 9890 if (extraSpace == 0) { 9891 return drawableState; 9892 } 9893 9894 final int[] fullState; 9895 if (drawableState != null) { 9896 fullState = new int[drawableState.length + extraSpace]; 9897 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 9898 } else { 9899 fullState = new int[extraSpace]; 9900 } 9901 9902 return fullState; 9903 } 9904 9905 /** 9906 * Merge your own state values in <var>additionalState</var> into the base 9907 * state values <var>baseState</var> that were returned by 9908 * {@link #onCreateDrawableState}. 9909 * 9910 * @param baseState The base state values returned by 9911 * {@link #onCreateDrawableState}, which will be modified to also hold your 9912 * own additional state values. 9913 * 9914 * @param additionalState The additional state values you would like 9915 * added to <var>baseState</var>; this array is not modified. 9916 * 9917 * @return As a convenience, the <var>baseState</var> array you originally 9918 * passed into the function is returned. 9919 * 9920 * @see #onCreateDrawableState 9921 */ 9922 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 9923 final int N = baseState.length; 9924 int i = N - 1; 9925 while (i >= 0 && baseState[i] == 0) { 9926 i--; 9927 } 9928 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 9929 return baseState; 9930 } 9931 9932 /** 9933 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 9934 * on all Drawable objects associated with this view. 9935 */ 9936 public void jumpDrawablesToCurrentState() { 9937 if (mBGDrawable != null) { 9938 mBGDrawable.jumpToCurrentState(); 9939 } 9940 } 9941 9942 /** 9943 * Sets the background color for this view. 9944 * @param color the color of the background 9945 */ 9946 @RemotableViewMethod 9947 public void setBackgroundColor(int color) { 9948 if (mBGDrawable instanceof ColorDrawable) { 9949 ((ColorDrawable) mBGDrawable).setColor(color); 9950 } else { 9951 setBackgroundDrawable(new ColorDrawable(color)); 9952 } 9953 } 9954 9955 /** 9956 * Set the background to a given resource. The resource should refer to 9957 * a Drawable object or 0 to remove the background. 9958 * @param resid The identifier of the resource. 9959 * @attr ref android.R.styleable#View_background 9960 */ 9961 @RemotableViewMethod 9962 public void setBackgroundResource(int resid) { 9963 if (resid != 0 && resid == mBackgroundResource) { 9964 return; 9965 } 9966 9967 Drawable d= null; 9968 if (resid != 0) { 9969 d = mResources.getDrawable(resid); 9970 } 9971 setBackgroundDrawable(d); 9972 9973 mBackgroundResource = resid; 9974 } 9975 9976 /** 9977 * Set the background to a given Drawable, or remove the background. If the 9978 * background has padding, this View's padding is set to the background's 9979 * padding. However, when a background is removed, this View's padding isn't 9980 * touched. If setting the padding is desired, please use 9981 * {@link #setPadding(int, int, int, int)}. 9982 * 9983 * @param d The Drawable to use as the background, or null to remove the 9984 * background 9985 */ 9986 public void setBackgroundDrawable(Drawable d) { 9987 boolean requestLayout = false; 9988 9989 mBackgroundResource = 0; 9990 9991 /* 9992 * Regardless of whether we're setting a new background or not, we want 9993 * to clear the previous drawable. 9994 */ 9995 if (mBGDrawable != null) { 9996 mBGDrawable.setCallback(null); 9997 unscheduleDrawable(mBGDrawable); 9998 } 9999 10000 if (d != null) { 10001 Rect padding = sThreadLocal.get(); 10002 if (padding == null) { 10003 padding = new Rect(); 10004 sThreadLocal.set(padding); 10005 } 10006 if (d.getPadding(padding)) { 10007 setPadding(padding.left, padding.top, padding.right, padding.bottom); 10008 } 10009 10010 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 10011 // if it has a different minimum size, we should layout again 10012 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 10013 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 10014 requestLayout = true; 10015 } 10016 10017 d.setCallback(this); 10018 if (d.isStateful()) { 10019 d.setState(getDrawableState()); 10020 } 10021 d.setVisible(getVisibility() == VISIBLE, false); 10022 mBGDrawable = d; 10023 10024 if ((mPrivateFlags & SKIP_DRAW) != 0) { 10025 mPrivateFlags &= ~SKIP_DRAW; 10026 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 10027 requestLayout = true; 10028 } 10029 } else { 10030 /* Remove the background */ 10031 mBGDrawable = null; 10032 10033 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 10034 /* 10035 * This view ONLY drew the background before and we're removing 10036 * the background, so now it won't draw anything 10037 * (hence we SKIP_DRAW) 10038 */ 10039 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 10040 mPrivateFlags |= SKIP_DRAW; 10041 } 10042 10043 /* 10044 * When the background is set, we try to apply its padding to this 10045 * View. When the background is removed, we don't touch this View's 10046 * padding. This is noted in the Javadocs. Hence, we don't need to 10047 * requestLayout(), the invalidate() below is sufficient. 10048 */ 10049 10050 // The old background's minimum size could have affected this 10051 // View's layout, so let's requestLayout 10052 requestLayout = true; 10053 } 10054 10055 computeOpaqueFlags(); 10056 10057 if (requestLayout) { 10058 requestLayout(); 10059 } 10060 10061 mBackgroundSizeChanged = true; 10062 invalidate(true); 10063 } 10064 10065 /** 10066 * Gets the background drawable 10067 * @return The drawable used as the background for this view, if any. 10068 */ 10069 public Drawable getBackground() { 10070 return mBGDrawable; 10071 } 10072 10073 /** 10074 * Sets the padding. The view may add on the space required to display 10075 * the scrollbars, depending on the style and visibility of the scrollbars. 10076 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 10077 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 10078 * from the values set in this call. 10079 * 10080 * @attr ref android.R.styleable#View_padding 10081 * @attr ref android.R.styleable#View_paddingBottom 10082 * @attr ref android.R.styleable#View_paddingLeft 10083 * @attr ref android.R.styleable#View_paddingRight 10084 * @attr ref android.R.styleable#View_paddingTop 10085 * @param left the left padding in pixels 10086 * @param top the top padding in pixels 10087 * @param right the right padding in pixels 10088 * @param bottom the bottom padding in pixels 10089 */ 10090 public void setPadding(int left, int top, int right, int bottom) { 10091 boolean changed = false; 10092 10093 mUserPaddingLeft = left; 10094 mUserPaddingRight = right; 10095 mUserPaddingBottom = bottom; 10096 10097 final int viewFlags = mViewFlags; 10098 10099 // Common case is there are no scroll bars. 10100 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 10101 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 10102 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 10103 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 10104 ? 0 : getVerticalScrollbarWidth(); 10105 switch (mVerticalScrollbarPosition) { 10106 case SCROLLBAR_POSITION_DEFAULT: 10107 case SCROLLBAR_POSITION_RIGHT: 10108 right += offset; 10109 break; 10110 case SCROLLBAR_POSITION_LEFT: 10111 left += offset; 10112 break; 10113 } 10114 } 10115 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 10116 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 10117 ? 0 : getHorizontalScrollbarHeight(); 10118 } 10119 } 10120 10121 if (mPaddingLeft != left) { 10122 changed = true; 10123 mPaddingLeft = left; 10124 } 10125 if (mPaddingTop != top) { 10126 changed = true; 10127 mPaddingTop = top; 10128 } 10129 if (mPaddingRight != right) { 10130 changed = true; 10131 mPaddingRight = right; 10132 } 10133 if (mPaddingBottom != bottom) { 10134 changed = true; 10135 mPaddingBottom = bottom; 10136 } 10137 10138 if (changed) { 10139 requestLayout(); 10140 } 10141 } 10142 10143 /** 10144 * Returns the top padding of this view. 10145 * 10146 * @return the top padding in pixels 10147 */ 10148 public int getPaddingTop() { 10149 return mPaddingTop; 10150 } 10151 10152 /** 10153 * Returns the bottom padding of this view. If there are inset and enabled 10154 * scrollbars, this value may include the space required to display the 10155 * scrollbars as well. 10156 * 10157 * @return the bottom padding in pixels 10158 */ 10159 public int getPaddingBottom() { 10160 return mPaddingBottom; 10161 } 10162 10163 /** 10164 * Returns the left padding of this view. If there are inset and enabled 10165 * scrollbars, this value may include the space required to display the 10166 * scrollbars as well. 10167 * 10168 * @return the left padding in pixels 10169 */ 10170 public int getPaddingLeft() { 10171 return mPaddingLeft; 10172 } 10173 10174 /** 10175 * Returns the right padding of this view. If there are inset and enabled 10176 * scrollbars, this value may include the space required to display the 10177 * scrollbars as well. 10178 * 10179 * @return the right padding in pixels 10180 */ 10181 public int getPaddingRight() { 10182 return mPaddingRight; 10183 } 10184 10185 /** 10186 * Changes the selection state of this view. A view can be selected or not. 10187 * Note that selection is not the same as focus. Views are typically 10188 * selected in the context of an AdapterView like ListView or GridView; 10189 * the selected view is the view that is highlighted. 10190 * 10191 * @param selected true if the view must be selected, false otherwise 10192 */ 10193 public void setSelected(boolean selected) { 10194 if (((mPrivateFlags & SELECTED) != 0) != selected) { 10195 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 10196 if (!selected) resetPressedState(); 10197 invalidate(true); 10198 refreshDrawableState(); 10199 dispatchSetSelected(selected); 10200 } 10201 } 10202 10203 /** 10204 * Dispatch setSelected to all of this View's children. 10205 * 10206 * @see #setSelected(boolean) 10207 * 10208 * @param selected The new selected state 10209 */ 10210 protected void dispatchSetSelected(boolean selected) { 10211 } 10212 10213 /** 10214 * Indicates the selection state of this view. 10215 * 10216 * @return true if the view is selected, false otherwise 10217 */ 10218 @ViewDebug.ExportedProperty 10219 public boolean isSelected() { 10220 return (mPrivateFlags & SELECTED) != 0; 10221 } 10222 10223 /** 10224 * Changes the activated state of this view. A view can be activated or not. 10225 * Note that activation is not the same as selection. Selection is 10226 * a transient property, representing the view (hierarchy) the user is 10227 * currently interacting with. Activation is a longer-term state that the 10228 * user can move views in and out of. For example, in a list view with 10229 * single or multiple selection enabled, the views in the current selection 10230 * set are activated. (Um, yeah, we are deeply sorry about the terminology 10231 * here.) The activated state is propagated down to children of the view it 10232 * is set on. 10233 * 10234 * @param activated true if the view must be activated, false otherwise 10235 */ 10236 public void setActivated(boolean activated) { 10237 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 10238 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 10239 invalidate(true); 10240 refreshDrawableState(); 10241 dispatchSetActivated(activated); 10242 } 10243 } 10244 10245 /** 10246 * Dispatch setActivated to all of this View's children. 10247 * 10248 * @see #setActivated(boolean) 10249 * 10250 * @param activated The new activated state 10251 */ 10252 protected void dispatchSetActivated(boolean activated) { 10253 } 10254 10255 /** 10256 * Indicates the activation state of this view. 10257 * 10258 * @return true if the view is activated, false otherwise 10259 */ 10260 @ViewDebug.ExportedProperty 10261 public boolean isActivated() { 10262 return (mPrivateFlags & ACTIVATED) != 0; 10263 } 10264 10265 /** 10266 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 10267 * observer can be used to get notifications when global events, like 10268 * layout, happen. 10269 * 10270 * The returned ViewTreeObserver observer is not guaranteed to remain 10271 * valid for the lifetime of this View. If the caller of this method keeps 10272 * a long-lived reference to ViewTreeObserver, it should always check for 10273 * the return value of {@link ViewTreeObserver#isAlive()}. 10274 * 10275 * @return The ViewTreeObserver for this view's hierarchy. 10276 */ 10277 public ViewTreeObserver getViewTreeObserver() { 10278 if (mAttachInfo != null) { 10279 return mAttachInfo.mTreeObserver; 10280 } 10281 if (mFloatingTreeObserver == null) { 10282 mFloatingTreeObserver = new ViewTreeObserver(); 10283 } 10284 return mFloatingTreeObserver; 10285 } 10286 10287 /** 10288 * <p>Finds the topmost view in the current view hierarchy.</p> 10289 * 10290 * @return the topmost view containing this view 10291 */ 10292 public View getRootView() { 10293 if (mAttachInfo != null) { 10294 final View v = mAttachInfo.mRootView; 10295 if (v != null) { 10296 return v; 10297 } 10298 } 10299 10300 View parent = this; 10301 10302 while (parent.mParent != null && parent.mParent instanceof View) { 10303 parent = (View) parent.mParent; 10304 } 10305 10306 return parent; 10307 } 10308 10309 /** 10310 * <p>Computes the coordinates of this view on the screen. The argument 10311 * must be an array of two integers. After the method returns, the array 10312 * contains the x and y location in that order.</p> 10313 * 10314 * @param location an array of two integers in which to hold the coordinates 10315 */ 10316 public void getLocationOnScreen(int[] location) { 10317 getLocationInWindow(location); 10318 10319 final AttachInfo info = mAttachInfo; 10320 if (info != null) { 10321 location[0] += info.mWindowLeft; 10322 location[1] += info.mWindowTop; 10323 } 10324 } 10325 10326 /** 10327 * <p>Computes the coordinates of this view in its window. The argument 10328 * must be an array of two integers. After the method returns, the array 10329 * contains the x and y location in that order.</p> 10330 * 10331 * @param location an array of two integers in which to hold the coordinates 10332 */ 10333 public void getLocationInWindow(int[] location) { 10334 if (location == null || location.length < 2) { 10335 throw new IllegalArgumentException("location must be an array of " 10336 + "two integers"); 10337 } 10338 10339 location[0] = mLeft + (int) (mTranslationX + 0.5f); 10340 location[1] = mTop + (int) (mTranslationY + 0.5f); 10341 10342 ViewParent viewParent = mParent; 10343 while (viewParent instanceof View) { 10344 final View view = (View)viewParent; 10345 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 10346 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 10347 viewParent = view.mParent; 10348 } 10349 10350 if (viewParent instanceof ViewRoot) { 10351 // *cough* 10352 final ViewRoot vr = (ViewRoot)viewParent; 10353 location[1] -= vr.mCurScrollY; 10354 } 10355 } 10356 10357 /** 10358 * {@hide} 10359 * @param id the id of the view to be found 10360 * @return the view of the specified id, null if cannot be found 10361 */ 10362 protected View findViewTraversal(int id) { 10363 if (id == mID) { 10364 return this; 10365 } 10366 return null; 10367 } 10368 10369 /** 10370 * {@hide} 10371 * @param tag the tag of the view to be found 10372 * @return the view of specified tag, null if cannot be found 10373 */ 10374 protected View findViewWithTagTraversal(Object tag) { 10375 if (tag != null && tag.equals(mTag)) { 10376 return this; 10377 } 10378 return null; 10379 } 10380 10381 /** 10382 * {@hide} 10383 * @param predicate The predicate to evaluate. 10384 * @return The first view that matches the predicate or null. 10385 */ 10386 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 10387 if (predicate.apply(this)) { 10388 return this; 10389 } 10390 return null; 10391 } 10392 10393 /** 10394 * Look for a child view with the given id. If this view has the given 10395 * id, return this view. 10396 * 10397 * @param id The id to search for. 10398 * @return The view that has the given id in the hierarchy or null 10399 */ 10400 public final View findViewById(int id) { 10401 if (id < 0) { 10402 return null; 10403 } 10404 return findViewTraversal(id); 10405 } 10406 10407 /** 10408 * Look for a child view with the given tag. If this view has the given 10409 * tag, return this view. 10410 * 10411 * @param tag The tag to search for, using "tag.equals(getTag())". 10412 * @return The View that has the given tag in the hierarchy or null 10413 */ 10414 public final View findViewWithTag(Object tag) { 10415 if (tag == null) { 10416 return null; 10417 } 10418 return findViewWithTagTraversal(tag); 10419 } 10420 10421 /** 10422 * {@hide} 10423 * Look for a child view that matches the specified predicate. 10424 * If this view matches the predicate, return this view. 10425 * 10426 * @param predicate The predicate to evaluate. 10427 * @return The first view that matches the predicate or null. 10428 */ 10429 public final View findViewByPredicate(Predicate<View> predicate) { 10430 return findViewByPredicateTraversal(predicate); 10431 } 10432 10433 /** 10434 * Sets the identifier for this view. The identifier does not have to be 10435 * unique in this view's hierarchy. The identifier should be a positive 10436 * number. 10437 * 10438 * @see #NO_ID 10439 * @see #getId 10440 * @see #findViewById 10441 * 10442 * @param id a number used to identify the view 10443 * 10444 * @attr ref android.R.styleable#View_id 10445 */ 10446 public void setId(int id) { 10447 mID = id; 10448 } 10449 10450 /** 10451 * {@hide} 10452 * 10453 * @param isRoot true if the view belongs to the root namespace, false 10454 * otherwise 10455 */ 10456 public void setIsRootNamespace(boolean isRoot) { 10457 if (isRoot) { 10458 mPrivateFlags |= IS_ROOT_NAMESPACE; 10459 } else { 10460 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 10461 } 10462 } 10463 10464 /** 10465 * {@hide} 10466 * 10467 * @return true if the view belongs to the root namespace, false otherwise 10468 */ 10469 public boolean isRootNamespace() { 10470 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 10471 } 10472 10473 /** 10474 * Returns this view's identifier. 10475 * 10476 * @return a positive integer used to identify the view or {@link #NO_ID} 10477 * if the view has no ID 10478 * 10479 * @see #setId 10480 * @see #findViewById 10481 * @attr ref android.R.styleable#View_id 10482 */ 10483 @ViewDebug.CapturedViewProperty 10484 public int getId() { 10485 return mID; 10486 } 10487 10488 /** 10489 * Returns this view's tag. 10490 * 10491 * @return the Object stored in this view as a tag 10492 * 10493 * @see #setTag(Object) 10494 * @see #getTag(int) 10495 */ 10496 @ViewDebug.ExportedProperty 10497 public Object getTag() { 10498 return mTag; 10499 } 10500 10501 /** 10502 * Sets the tag associated with this view. A tag can be used to mark 10503 * a view in its hierarchy and does not have to be unique within the 10504 * hierarchy. Tags can also be used to store data within a view without 10505 * resorting to another data structure. 10506 * 10507 * @param tag an Object to tag the view with 10508 * 10509 * @see #getTag() 10510 * @see #setTag(int, Object) 10511 */ 10512 public void setTag(final Object tag) { 10513 mTag = tag; 10514 } 10515 10516 /** 10517 * Returns the tag associated with this view and the specified key. 10518 * 10519 * @param key The key identifying the tag 10520 * 10521 * @return the Object stored in this view as a tag 10522 * 10523 * @see #setTag(int, Object) 10524 * @see #getTag() 10525 */ 10526 public Object getTag(int key) { 10527 SparseArray<Object> tags = null; 10528 synchronized (sTagsLock) { 10529 if (sTags != null) { 10530 tags = sTags.get(this); 10531 } 10532 } 10533 10534 if (tags != null) return tags.get(key); 10535 return null; 10536 } 10537 10538 /** 10539 * Sets a tag associated with this view and a key. A tag can be used 10540 * to mark a view in its hierarchy and does not have to be unique within 10541 * the hierarchy. Tags can also be used to store data within a view 10542 * without resorting to another data structure. 10543 * 10544 * The specified key should be an id declared in the resources of the 10545 * application to ensure it is unique (see the <a 10546 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 10547 * Keys identified as belonging to 10548 * the Android framework or not associated with any package will cause 10549 * an {@link IllegalArgumentException} to be thrown. 10550 * 10551 * @param key The key identifying the tag 10552 * @param tag An Object to tag the view with 10553 * 10554 * @throws IllegalArgumentException If they specified key is not valid 10555 * 10556 * @see #setTag(Object) 10557 * @see #getTag(int) 10558 */ 10559 public void setTag(int key, final Object tag) { 10560 // If the package id is 0x00 or 0x01, it's either an undefined package 10561 // or a framework id 10562 if ((key >>> 24) < 2) { 10563 throw new IllegalArgumentException("The key must be an application-specific " 10564 + "resource id."); 10565 } 10566 10567 setTagInternal(this, key, tag); 10568 } 10569 10570 /** 10571 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 10572 * framework id. 10573 * 10574 * @hide 10575 */ 10576 public void setTagInternal(int key, Object tag) { 10577 if ((key >>> 24) != 0x1) { 10578 throw new IllegalArgumentException("The key must be a framework-specific " 10579 + "resource id."); 10580 } 10581 10582 setTagInternal(this, key, tag); 10583 } 10584 10585 private static void setTagInternal(View view, int key, Object tag) { 10586 SparseArray<Object> tags = null; 10587 synchronized (sTagsLock) { 10588 if (sTags == null) { 10589 sTags = new WeakHashMap<View, SparseArray<Object>>(); 10590 } else { 10591 tags = sTags.get(view); 10592 } 10593 } 10594 10595 if (tags == null) { 10596 tags = new SparseArray<Object>(2); 10597 synchronized (sTagsLock) { 10598 sTags.put(view, tags); 10599 } 10600 } 10601 10602 tags.put(key, tag); 10603 } 10604 10605 /** 10606 * @param consistency The type of consistency. See ViewDebug for more information. 10607 * 10608 * @hide 10609 */ 10610 protected boolean dispatchConsistencyCheck(int consistency) { 10611 return onConsistencyCheck(consistency); 10612 } 10613 10614 /** 10615 * Method that subclasses should implement to check their consistency. The type of 10616 * consistency check is indicated by the bit field passed as a parameter. 10617 * 10618 * @param consistency The type of consistency. See ViewDebug for more information. 10619 * 10620 * @throws IllegalStateException if the view is in an inconsistent state. 10621 * 10622 * @hide 10623 */ 10624 protected boolean onConsistencyCheck(int consistency) { 10625 boolean result = true; 10626 10627 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 10628 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 10629 10630 if (checkLayout) { 10631 if (getParent() == null) { 10632 result = false; 10633 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10634 "View " + this + " does not have a parent."); 10635 } 10636 10637 if (mAttachInfo == null) { 10638 result = false; 10639 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10640 "View " + this + " is not attached to a window."); 10641 } 10642 } 10643 10644 if (checkDrawing) { 10645 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 10646 // from their draw() method 10647 10648 if ((mPrivateFlags & DRAWN) != DRAWN && 10649 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 10650 result = false; 10651 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10652 "View " + this + " was invalidated but its drawing cache is valid."); 10653 } 10654 } 10655 10656 return result; 10657 } 10658 10659 /** 10660 * Prints information about this view in the log output, with the tag 10661 * {@link #VIEW_LOG_TAG}. 10662 * 10663 * @hide 10664 */ 10665 public void debug() { 10666 debug(0); 10667 } 10668 10669 /** 10670 * Prints information about this view in the log output, with the tag 10671 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 10672 * indentation defined by the <code>depth</code>. 10673 * 10674 * @param depth the indentation level 10675 * 10676 * @hide 10677 */ 10678 protected void debug(int depth) { 10679 String output = debugIndent(depth - 1); 10680 10681 output += "+ " + this; 10682 int id = getId(); 10683 if (id != -1) { 10684 output += " (id=" + id + ")"; 10685 } 10686 Object tag = getTag(); 10687 if (tag != null) { 10688 output += " (tag=" + tag + ")"; 10689 } 10690 Log.d(VIEW_LOG_TAG, output); 10691 10692 if ((mPrivateFlags & FOCUSED) != 0) { 10693 output = debugIndent(depth) + " FOCUSED"; 10694 Log.d(VIEW_LOG_TAG, output); 10695 } 10696 10697 output = debugIndent(depth); 10698 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 10699 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 10700 + "} "; 10701 Log.d(VIEW_LOG_TAG, output); 10702 10703 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 10704 || mPaddingBottom != 0) { 10705 output = debugIndent(depth); 10706 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 10707 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 10708 Log.d(VIEW_LOG_TAG, output); 10709 } 10710 10711 output = debugIndent(depth); 10712 output += "mMeasureWidth=" + mMeasuredWidth + 10713 " mMeasureHeight=" + mMeasuredHeight; 10714 Log.d(VIEW_LOG_TAG, output); 10715 10716 output = debugIndent(depth); 10717 if (mLayoutParams == null) { 10718 output += "BAD! no layout params"; 10719 } else { 10720 output = mLayoutParams.debug(output); 10721 } 10722 Log.d(VIEW_LOG_TAG, output); 10723 10724 output = debugIndent(depth); 10725 output += "flags={"; 10726 output += View.printFlags(mViewFlags); 10727 output += "}"; 10728 Log.d(VIEW_LOG_TAG, output); 10729 10730 output = debugIndent(depth); 10731 output += "privateFlags={"; 10732 output += View.printPrivateFlags(mPrivateFlags); 10733 output += "}"; 10734 Log.d(VIEW_LOG_TAG, output); 10735 } 10736 10737 /** 10738 * Creates an string of whitespaces used for indentation. 10739 * 10740 * @param depth the indentation level 10741 * @return a String containing (depth * 2 + 3) * 2 white spaces 10742 * 10743 * @hide 10744 */ 10745 protected static String debugIndent(int depth) { 10746 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 10747 for (int i = 0; i < (depth * 2) + 3; i++) { 10748 spaces.append(' ').append(' '); 10749 } 10750 return spaces.toString(); 10751 } 10752 10753 /** 10754 * <p>Return the offset of the widget's text baseline from the widget's top 10755 * boundary. If this widget does not support baseline alignment, this 10756 * method returns -1. </p> 10757 * 10758 * @return the offset of the baseline within the widget's bounds or -1 10759 * if baseline alignment is not supported 10760 */ 10761 @ViewDebug.ExportedProperty(category = "layout") 10762 public int getBaseline() { 10763 return -1; 10764 } 10765 10766 /** 10767 * Call this when something has changed which has invalidated the 10768 * layout of this view. This will schedule a layout pass of the view 10769 * tree. 10770 */ 10771 public void requestLayout() { 10772 if (ViewDebug.TRACE_HIERARCHY) { 10773 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 10774 } 10775 10776 mPrivateFlags |= FORCE_LAYOUT; 10777 mPrivateFlags |= INVALIDATED; 10778 10779 if (mParent != null && !mParent.isLayoutRequested()) { 10780 mParent.requestLayout(); 10781 } 10782 } 10783 10784 /** 10785 * Forces this view to be laid out during the next layout pass. 10786 * This method does not call requestLayout() or forceLayout() 10787 * on the parent. 10788 */ 10789 public void forceLayout() { 10790 mPrivateFlags |= FORCE_LAYOUT; 10791 mPrivateFlags |= INVALIDATED; 10792 } 10793 10794 /** 10795 * <p> 10796 * This is called to find out how big a view should be. The parent 10797 * supplies constraint information in the width and height parameters. 10798 * </p> 10799 * 10800 * <p> 10801 * The actual mesurement work of a view is performed in 10802 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 10803 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 10804 * </p> 10805 * 10806 * 10807 * @param widthMeasureSpec Horizontal space requirements as imposed by the 10808 * parent 10809 * @param heightMeasureSpec Vertical space requirements as imposed by the 10810 * parent 10811 * 10812 * @see #onMeasure(int, int) 10813 */ 10814 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 10815 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 10816 widthMeasureSpec != mOldWidthMeasureSpec || 10817 heightMeasureSpec != mOldHeightMeasureSpec) { 10818 10819 // first clears the measured dimension flag 10820 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 10821 10822 if (ViewDebug.TRACE_HIERARCHY) { 10823 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 10824 } 10825 10826 // measure ourselves, this should set the measured dimension flag back 10827 onMeasure(widthMeasureSpec, heightMeasureSpec); 10828 10829 // flag not set, setMeasuredDimension() was not invoked, we raise 10830 // an exception to warn the developer 10831 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 10832 throw new IllegalStateException("onMeasure() did not set the" 10833 + " measured dimension by calling" 10834 + " setMeasuredDimension()"); 10835 } 10836 10837 mPrivateFlags |= LAYOUT_REQUIRED; 10838 } 10839 10840 mOldWidthMeasureSpec = widthMeasureSpec; 10841 mOldHeightMeasureSpec = heightMeasureSpec; 10842 } 10843 10844 /** 10845 * <p> 10846 * Measure the view and its content to determine the measured width and the 10847 * measured height. This method is invoked by {@link #measure(int, int)} and 10848 * should be overriden by subclasses to provide accurate and efficient 10849 * measurement of their contents. 10850 * </p> 10851 * 10852 * <p> 10853 * <strong>CONTRACT:</strong> When overriding this method, you 10854 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 10855 * measured width and height of this view. Failure to do so will trigger an 10856 * <code>IllegalStateException</code>, thrown by 10857 * {@link #measure(int, int)}. Calling the superclass' 10858 * {@link #onMeasure(int, int)} is a valid use. 10859 * </p> 10860 * 10861 * <p> 10862 * The base class implementation of measure defaults to the background size, 10863 * unless a larger size is allowed by the MeasureSpec. Subclasses should 10864 * override {@link #onMeasure(int, int)} to provide better measurements of 10865 * their content. 10866 * </p> 10867 * 10868 * <p> 10869 * If this method is overridden, it is the subclass's responsibility to make 10870 * sure the measured height and width are at least the view's minimum height 10871 * and width ({@link #getSuggestedMinimumHeight()} and 10872 * {@link #getSuggestedMinimumWidth()}). 10873 * </p> 10874 * 10875 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 10876 * The requirements are encoded with 10877 * {@link android.view.View.MeasureSpec}. 10878 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 10879 * The requirements are encoded with 10880 * {@link android.view.View.MeasureSpec}. 10881 * 10882 * @see #getMeasuredWidth() 10883 * @see #getMeasuredHeight() 10884 * @see #setMeasuredDimension(int, int) 10885 * @see #getSuggestedMinimumHeight() 10886 * @see #getSuggestedMinimumWidth() 10887 * @see android.view.View.MeasureSpec#getMode(int) 10888 * @see android.view.View.MeasureSpec#getSize(int) 10889 */ 10890 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 10891 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 10892 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 10893 } 10894 10895 /** 10896 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 10897 * measured width and measured height. Failing to do so will trigger an 10898 * exception at measurement time.</p> 10899 * 10900 * @param measuredWidth The measured width of this view. May be a complex 10901 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10902 * {@link #MEASURED_STATE_TOO_SMALL}. 10903 * @param measuredHeight The measured height of this view. May be a complex 10904 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10905 * {@link #MEASURED_STATE_TOO_SMALL}. 10906 */ 10907 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 10908 mMeasuredWidth = measuredWidth; 10909 mMeasuredHeight = measuredHeight; 10910 10911 mPrivateFlags |= MEASURED_DIMENSION_SET; 10912 } 10913 10914 /** 10915 * Merge two states as returned by {@link #getMeasuredState()}. 10916 * @param curState The current state as returned from a view or the result 10917 * of combining multiple views. 10918 * @param newState The new view state to combine. 10919 * @return Returns a new integer reflecting the combination of the two 10920 * states. 10921 */ 10922 public static int combineMeasuredStates(int curState, int newState) { 10923 return curState | newState; 10924 } 10925 10926 /** 10927 * Version of {@link #resolveSizeAndState(int, int, int)} 10928 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 10929 */ 10930 public static int resolveSize(int size, int measureSpec) { 10931 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 10932 } 10933 10934 /** 10935 * Utility to reconcile a desired size and state, with constraints imposed 10936 * by a MeasureSpec. Will take the desired size, unless a different size 10937 * is imposed by the constraints. The returned value is a compound integer, 10938 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 10939 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 10940 * size is smaller than the size the view wants to be. 10941 * 10942 * @param size How big the view wants to be 10943 * @param measureSpec Constraints imposed by the parent 10944 * @return Size information bit mask as defined by 10945 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 10946 */ 10947 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 10948 int result = size; 10949 int specMode = MeasureSpec.getMode(measureSpec); 10950 int specSize = MeasureSpec.getSize(measureSpec); 10951 switch (specMode) { 10952 case MeasureSpec.UNSPECIFIED: 10953 result = size; 10954 break; 10955 case MeasureSpec.AT_MOST: 10956 if (specSize < size) { 10957 result = specSize | MEASURED_STATE_TOO_SMALL; 10958 } else { 10959 result = size; 10960 } 10961 break; 10962 case MeasureSpec.EXACTLY: 10963 result = specSize; 10964 break; 10965 } 10966 return result | (childMeasuredState&MEASURED_STATE_MASK); 10967 } 10968 10969 /** 10970 * Utility to return a default size. Uses the supplied size if the 10971 * MeasureSpec imposed no contraints. Will get larger if allowed 10972 * by the MeasureSpec. 10973 * 10974 * @param size Default size for this view 10975 * @param measureSpec Constraints imposed by the parent 10976 * @return The size this view should be. 10977 */ 10978 public static int getDefaultSize(int size, int measureSpec) { 10979 int result = size; 10980 int specMode = MeasureSpec.getMode(measureSpec); 10981 int specSize = MeasureSpec.getSize(measureSpec); 10982 10983 switch (specMode) { 10984 case MeasureSpec.UNSPECIFIED: 10985 result = size; 10986 break; 10987 case MeasureSpec.AT_MOST: 10988 case MeasureSpec.EXACTLY: 10989 result = specSize; 10990 break; 10991 } 10992 return result; 10993 } 10994 10995 /** 10996 * Returns the suggested minimum height that the view should use. This 10997 * returns the maximum of the view's minimum height 10998 * and the background's minimum height 10999 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 11000 * <p> 11001 * When being used in {@link #onMeasure(int, int)}, the caller should still 11002 * ensure the returned height is within the requirements of the parent. 11003 * 11004 * @return The suggested minimum height of the view. 11005 */ 11006 protected int getSuggestedMinimumHeight() { 11007 int suggestedMinHeight = mMinHeight; 11008 11009 if (mBGDrawable != null) { 11010 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 11011 if (suggestedMinHeight < bgMinHeight) { 11012 suggestedMinHeight = bgMinHeight; 11013 } 11014 } 11015 11016 return suggestedMinHeight; 11017 } 11018 11019 /** 11020 * Returns the suggested minimum width that the view should use. This 11021 * returns the maximum of the view's minimum width) 11022 * and the background's minimum width 11023 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 11024 * <p> 11025 * When being used in {@link #onMeasure(int, int)}, the caller should still 11026 * ensure the returned width is within the requirements of the parent. 11027 * 11028 * @return The suggested minimum width of the view. 11029 */ 11030 protected int getSuggestedMinimumWidth() { 11031 int suggestedMinWidth = mMinWidth; 11032 11033 if (mBGDrawable != null) { 11034 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 11035 if (suggestedMinWidth < bgMinWidth) { 11036 suggestedMinWidth = bgMinWidth; 11037 } 11038 } 11039 11040 return suggestedMinWidth; 11041 } 11042 11043 /** 11044 * Sets the minimum height of the view. It is not guaranteed the view will 11045 * be able to achieve this minimum height (for example, if its parent layout 11046 * constrains it with less available height). 11047 * 11048 * @param minHeight The minimum height the view will try to be. 11049 */ 11050 public void setMinimumHeight(int minHeight) { 11051 mMinHeight = minHeight; 11052 } 11053 11054 /** 11055 * Sets the minimum width of the view. It is not guaranteed the view will 11056 * be able to achieve this minimum width (for example, if its parent layout 11057 * constrains it with less available width). 11058 * 11059 * @param minWidth The minimum width the view will try to be. 11060 */ 11061 public void setMinimumWidth(int minWidth) { 11062 mMinWidth = minWidth; 11063 } 11064 11065 /** 11066 * Get the animation currently associated with this view. 11067 * 11068 * @return The animation that is currently playing or 11069 * scheduled to play for this view. 11070 */ 11071 public Animation getAnimation() { 11072 return mCurrentAnimation; 11073 } 11074 11075 /** 11076 * Start the specified animation now. 11077 * 11078 * @param animation the animation to start now 11079 */ 11080 public void startAnimation(Animation animation) { 11081 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 11082 setAnimation(animation); 11083 invalidateParentCaches(); 11084 invalidate(true); 11085 } 11086 11087 /** 11088 * Cancels any animations for this view. 11089 */ 11090 public void clearAnimation() { 11091 if (mCurrentAnimation != null) { 11092 mCurrentAnimation.detach(); 11093 } 11094 mCurrentAnimation = null; 11095 invalidateParentIfNeeded(); 11096 } 11097 11098 /** 11099 * Sets the next animation to play for this view. 11100 * If you want the animation to play immediately, use 11101 * startAnimation. This method provides allows fine-grained 11102 * control over the start time and invalidation, but you 11103 * must make sure that 1) the animation has a start time set, and 11104 * 2) the view will be invalidated when the animation is supposed to 11105 * start. 11106 * 11107 * @param animation The next animation, or null. 11108 */ 11109 public void setAnimation(Animation animation) { 11110 mCurrentAnimation = animation; 11111 if (animation != null) { 11112 animation.reset(); 11113 } 11114 } 11115 11116 /** 11117 * Invoked by a parent ViewGroup to notify the start of the animation 11118 * currently associated with this view. If you override this method, 11119 * always call super.onAnimationStart(); 11120 * 11121 * @see #setAnimation(android.view.animation.Animation) 11122 * @see #getAnimation() 11123 */ 11124 protected void onAnimationStart() { 11125 mPrivateFlags |= ANIMATION_STARTED; 11126 } 11127 11128 /** 11129 * Invoked by a parent ViewGroup to notify the end of the animation 11130 * currently associated with this view. If you override this method, 11131 * always call super.onAnimationEnd(); 11132 * 11133 * @see #setAnimation(android.view.animation.Animation) 11134 * @see #getAnimation() 11135 */ 11136 protected void onAnimationEnd() { 11137 mPrivateFlags &= ~ANIMATION_STARTED; 11138 } 11139 11140 /** 11141 * Invoked if there is a Transform that involves alpha. Subclass that can 11142 * draw themselves with the specified alpha should return true, and then 11143 * respect that alpha when their onDraw() is called. If this returns false 11144 * then the view may be redirected to draw into an offscreen buffer to 11145 * fulfill the request, which will look fine, but may be slower than if the 11146 * subclass handles it internally. The default implementation returns false. 11147 * 11148 * @param alpha The alpha (0..255) to apply to the view's drawing 11149 * @return true if the view can draw with the specified alpha. 11150 */ 11151 protected boolean onSetAlpha(int alpha) { 11152 return false; 11153 } 11154 11155 /** 11156 * This is used by the RootView to perform an optimization when 11157 * the view hierarchy contains one or several SurfaceView. 11158 * SurfaceView is always considered transparent, but its children are not, 11159 * therefore all View objects remove themselves from the global transparent 11160 * region (passed as a parameter to this function). 11161 * 11162 * @param region The transparent region for this ViewRoot (window). 11163 * 11164 * @return Returns true if the effective visibility of the view at this 11165 * point is opaque, regardless of the transparent region; returns false 11166 * if it is possible for underlying windows to be seen behind the view. 11167 * 11168 * {@hide} 11169 */ 11170 public boolean gatherTransparentRegion(Region region) { 11171 final AttachInfo attachInfo = mAttachInfo; 11172 if (region != null && attachInfo != null) { 11173 final int pflags = mPrivateFlags; 11174 if ((pflags & SKIP_DRAW) == 0) { 11175 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 11176 // remove it from the transparent region. 11177 final int[] location = attachInfo.mTransparentLocation; 11178 getLocationInWindow(location); 11179 region.op(location[0], location[1], location[0] + mRight - mLeft, 11180 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 11181 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 11182 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 11183 // exists, so we remove the background drawable's non-transparent 11184 // parts from this transparent region. 11185 applyDrawableToTransparentRegion(mBGDrawable, region); 11186 } 11187 } 11188 return true; 11189 } 11190 11191 /** 11192 * Play a sound effect for this view. 11193 * 11194 * <p>The framework will play sound effects for some built in actions, such as 11195 * clicking, but you may wish to play these effects in your widget, 11196 * for instance, for internal navigation. 11197 * 11198 * <p>The sound effect will only be played if sound effects are enabled by the user, and 11199 * {@link #isSoundEffectsEnabled()} is true. 11200 * 11201 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 11202 */ 11203 public void playSoundEffect(int soundConstant) { 11204 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 11205 return; 11206 } 11207 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 11208 } 11209 11210 /** 11211 * BZZZTT!!1! 11212 * 11213 * <p>Provide haptic feedback to the user for this view. 11214 * 11215 * <p>The framework will provide haptic feedback for some built in actions, 11216 * such as long presses, but you may wish to provide feedback for your 11217 * own widget. 11218 * 11219 * <p>The feedback will only be performed if 11220 * {@link #isHapticFeedbackEnabled()} is true. 11221 * 11222 * @param feedbackConstant One of the constants defined in 11223 * {@link HapticFeedbackConstants} 11224 */ 11225 public boolean performHapticFeedback(int feedbackConstant) { 11226 return performHapticFeedback(feedbackConstant, 0); 11227 } 11228 11229 /** 11230 * BZZZTT!!1! 11231 * 11232 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 11233 * 11234 * @param feedbackConstant One of the constants defined in 11235 * {@link HapticFeedbackConstants} 11236 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 11237 */ 11238 public boolean performHapticFeedback(int feedbackConstant, int flags) { 11239 if (mAttachInfo == null) { 11240 return false; 11241 } 11242 //noinspection SimplifiableIfStatement 11243 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 11244 && !isHapticFeedbackEnabled()) { 11245 return false; 11246 } 11247 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 11248 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 11249 } 11250 11251 /** 11252 * Request that the visibility of the status bar be changed. 11253 */ 11254 public void setSystemUiVisibility(int visibility) { 11255 if (visibility != mSystemUiVisibility) { 11256 mSystemUiVisibility = visibility; 11257 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 11258 mParent.recomputeViewAttributes(this); 11259 } 11260 } 11261 } 11262 11263 /** 11264 * Returns the status bar visibility that this view has requested. 11265 */ 11266 public int getSystemUiVisibility() { 11267 return mSystemUiVisibility; 11268 } 11269 11270 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 11271 mOnSystemUiVisibilityChangeListener = l; 11272 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 11273 mParent.recomputeViewAttributes(this); 11274 } 11275 } 11276 11277 /** 11278 */ 11279 public void dispatchSystemUiVisibilityChanged(int visibility) { 11280 if (mOnSystemUiVisibilityChangeListener != null) { 11281 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 11282 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 11283 } 11284 } 11285 11286 /** 11287 * Creates an image that the system displays during the drag and drop 11288 * operation. This is called a "drag shadow". The default implementation 11289 * for a DragShadowBuilder based on a View returns an image that has exactly the same 11290 * appearance as the given View. The default also positions the center of the drag shadow 11291 * directly under the touch point. If no View is provided (the constructor with no parameters 11292 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 11293 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 11294 * default is an invisible drag shadow. 11295 * <p> 11296 * You are not required to use the View you provide to the constructor as the basis of the 11297 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 11298 * anything you want as the drag shadow. 11299 * </p> 11300 * <p> 11301 * You pass a DragShadowBuilder object to the system when you start the drag. The system 11302 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 11303 * size and position of the drag shadow. It uses this data to construct a 11304 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 11305 * so that your application can draw the shadow image in the Canvas. 11306 * </p> 11307 */ 11308 public static class DragShadowBuilder { 11309 private final WeakReference<View> mView; 11310 11311 /** 11312 * Constructs a shadow image builder based on a View. By default, the resulting drag 11313 * shadow will have the same appearance and dimensions as the View, with the touch point 11314 * over the center of the View. 11315 * @param view A View. Any View in scope can be used. 11316 */ 11317 public DragShadowBuilder(View view) { 11318 mView = new WeakReference<View>(view); 11319 } 11320 11321 /** 11322 * Construct a shadow builder object with no associated View. This 11323 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 11324 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 11325 * to supply the drag shadow's dimensions and appearance without 11326 * reference to any View object. If they are not overridden, then the result is an 11327 * invisible drag shadow. 11328 */ 11329 public DragShadowBuilder() { 11330 mView = new WeakReference<View>(null); 11331 } 11332 11333 /** 11334 * Returns the View object that had been passed to the 11335 * {@link #View.DragShadowBuilder(View)} 11336 * constructor. If that View parameter was {@code null} or if the 11337 * {@link #View.DragShadowBuilder()} 11338 * constructor was used to instantiate the builder object, this method will return 11339 * null. 11340 * 11341 * @return The View object associate with this builder object. 11342 */ 11343 final public View getView() { 11344 return mView.get(); 11345 } 11346 11347 /** 11348 * Provides the metrics for the shadow image. These include the dimensions of 11349 * the shadow image, and the point within that shadow that should 11350 * be centered under the touch location while dragging. 11351 * <p> 11352 * The default implementation sets the dimensions of the shadow to be the 11353 * same as the dimensions of the View itself and centers the shadow under 11354 * the touch point. 11355 * </p> 11356 * 11357 * @param shadowSize A {@link android.graphics.Point} containing the width and height 11358 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 11359 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 11360 * image. 11361 * 11362 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 11363 * shadow image that should be underneath the touch point during the drag and drop 11364 * operation. Your application must set {@link android.graphics.Point#x} to the 11365 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 11366 */ 11367 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 11368 final View view = mView.get(); 11369 if (view != null) { 11370 shadowSize.set(view.getWidth(), view.getHeight()); 11371 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 11372 } else { 11373 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 11374 } 11375 } 11376 11377 /** 11378 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 11379 * based on the dimensions it received from the 11380 * {@link #onProvideShadowMetrics(Point, Point)} callback. 11381 * 11382 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 11383 */ 11384 public void onDrawShadow(Canvas canvas) { 11385 final View view = mView.get(); 11386 if (view != null) { 11387 view.draw(canvas); 11388 } else { 11389 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 11390 } 11391 } 11392 } 11393 11394 /** 11395 * Starts a drag and drop operation. When your application calls this method, it passes a 11396 * {@link android.view.View.DragShadowBuilder} object to the system. The 11397 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 11398 * to get metrics for the drag shadow, and then calls the object's 11399 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 11400 * <p> 11401 * Once the system has the drag shadow, it begins the drag and drop operation by sending 11402 * drag events to all the View objects in your application that are currently visible. It does 11403 * this either by calling the View object's drag listener (an implementation of 11404 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 11405 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 11406 * Both are passed a {@link android.view.DragEvent} object that has a 11407 * {@link android.view.DragEvent#getAction()} value of 11408 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 11409 * </p> 11410 * <p> 11411 * Your application can invoke startDrag() on any attached View object. The View object does not 11412 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 11413 * be related to the View the user selected for dragging. 11414 * </p> 11415 * @param data A {@link android.content.ClipData} object pointing to the data to be 11416 * transferred by the drag and drop operation. 11417 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 11418 * drag shadow. 11419 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 11420 * drop operation. This Object is put into every DragEvent object sent by the system during the 11421 * current drag. 11422 * <p> 11423 * myLocalState is a lightweight mechanism for the sending information from the dragged View 11424 * to the target Views. For example, it can contain flags that differentiate between a 11425 * a copy operation and a move operation. 11426 * </p> 11427 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 11428 * so the parameter should be set to 0. 11429 * @return {@code true} if the method completes successfully, or 11430 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 11431 * do a drag, and so no drag operation is in progress. 11432 */ 11433 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 11434 Object myLocalState, int flags) { 11435 if (ViewDebug.DEBUG_DRAG) { 11436 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 11437 } 11438 boolean okay = false; 11439 11440 Point shadowSize = new Point(); 11441 Point shadowTouchPoint = new Point(); 11442 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 11443 11444 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 11445 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 11446 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 11447 } 11448 11449 if (ViewDebug.DEBUG_DRAG) { 11450 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 11451 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 11452 } 11453 Surface surface = new Surface(); 11454 try { 11455 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 11456 flags, shadowSize.x, shadowSize.y, surface); 11457 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 11458 + " surface=" + surface); 11459 if (token != null) { 11460 Canvas canvas = surface.lockCanvas(null); 11461 try { 11462 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 11463 shadowBuilder.onDrawShadow(canvas); 11464 } finally { 11465 surface.unlockCanvasAndPost(canvas); 11466 } 11467 11468 final ViewRoot root = getViewRoot(); 11469 11470 // Cache the local state object for delivery with DragEvents 11471 root.setLocalDragState(myLocalState); 11472 11473 // repurpose 'shadowSize' for the last touch point 11474 root.getLastTouchPoint(shadowSize); 11475 11476 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 11477 shadowSize.x, shadowSize.y, 11478 shadowTouchPoint.x, shadowTouchPoint.y, data); 11479 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 11480 } 11481 } catch (Exception e) { 11482 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 11483 surface.destroy(); 11484 } 11485 11486 return okay; 11487 } 11488 11489 /** 11490 * Handles drag events sent by the system following a call to 11491 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 11492 *<p> 11493 * When the system calls this method, it passes a 11494 * {@link android.view.DragEvent} object. A call to 11495 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 11496 * in DragEvent. The method uses these to determine what is happening in the drag and drop 11497 * operation. 11498 * @param event The {@link android.view.DragEvent} sent by the system. 11499 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 11500 * in DragEvent, indicating the type of drag event represented by this object. 11501 * @return {@code true} if the method was successful, otherwise {@code false}. 11502 * <p> 11503 * The method should return {@code true} in response to an action type of 11504 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 11505 * operation. 11506 * </p> 11507 * <p> 11508 * The method should also return {@code true} in response to an action type of 11509 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 11510 * {@code false} if it didn't. 11511 * </p> 11512 */ 11513 public boolean onDragEvent(DragEvent event) { 11514 return false; 11515 } 11516 11517 /** 11518 * Detects if this View is enabled and has a drag event listener. 11519 * If both are true, then it calls the drag event listener with the 11520 * {@link android.view.DragEvent} it received. If the drag event listener returns 11521 * {@code true}, then dispatchDragEvent() returns {@code true}. 11522 * <p> 11523 * For all other cases, the method calls the 11524 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 11525 * method and returns its result. 11526 * </p> 11527 * <p> 11528 * This ensures that a drag event is always consumed, even if the View does not have a drag 11529 * event listener. However, if the View has a listener and the listener returns true, then 11530 * onDragEvent() is not called. 11531 * </p> 11532 */ 11533 public boolean dispatchDragEvent(DragEvent event) { 11534 //noinspection SimplifiableIfStatement 11535 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 11536 && mOnDragListener.onDrag(this, event)) { 11537 return true; 11538 } 11539 return onDragEvent(event); 11540 } 11541 11542 /** 11543 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 11544 * it is ever exposed at all. 11545 * @hide 11546 */ 11547 public void onCloseSystemDialogs(String reason) { 11548 } 11549 11550 /** 11551 * Given a Drawable whose bounds have been set to draw into this view, 11552 * update a Region being computed for {@link #gatherTransparentRegion} so 11553 * that any non-transparent parts of the Drawable are removed from the 11554 * given transparent region. 11555 * 11556 * @param dr The Drawable whose transparency is to be applied to the region. 11557 * @param region A Region holding the current transparency information, 11558 * where any parts of the region that are set are considered to be 11559 * transparent. On return, this region will be modified to have the 11560 * transparency information reduced by the corresponding parts of the 11561 * Drawable that are not transparent. 11562 * {@hide} 11563 */ 11564 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 11565 if (DBG) { 11566 Log.i("View", "Getting transparent region for: " + this); 11567 } 11568 final Region r = dr.getTransparentRegion(); 11569 final Rect db = dr.getBounds(); 11570 final AttachInfo attachInfo = mAttachInfo; 11571 if (r != null && attachInfo != null) { 11572 final int w = getRight()-getLeft(); 11573 final int h = getBottom()-getTop(); 11574 if (db.left > 0) { 11575 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 11576 r.op(0, 0, db.left, h, Region.Op.UNION); 11577 } 11578 if (db.right < w) { 11579 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 11580 r.op(db.right, 0, w, h, Region.Op.UNION); 11581 } 11582 if (db.top > 0) { 11583 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 11584 r.op(0, 0, w, db.top, Region.Op.UNION); 11585 } 11586 if (db.bottom < h) { 11587 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 11588 r.op(0, db.bottom, w, h, Region.Op.UNION); 11589 } 11590 final int[] location = attachInfo.mTransparentLocation; 11591 getLocationInWindow(location); 11592 r.translate(location[0], location[1]); 11593 region.op(r, Region.Op.INTERSECT); 11594 } else { 11595 region.op(db, Region.Op.DIFFERENCE); 11596 } 11597 } 11598 11599 private void postCheckForLongClick(int delayOffset) { 11600 mHasPerformedLongPress = false; 11601 11602 if (mPendingCheckForLongPress == null) { 11603 mPendingCheckForLongPress = new CheckForLongPress(); 11604 } 11605 mPendingCheckForLongPress.rememberWindowAttachCount(); 11606 postDelayed(mPendingCheckForLongPress, 11607 ViewConfiguration.getLongPressTimeout() - delayOffset); 11608 } 11609 11610 /** 11611 * Inflate a view from an XML resource. This convenience method wraps the {@link 11612 * LayoutInflater} class, which provides a full range of options for view inflation. 11613 * 11614 * @param context The Context object for your activity or application. 11615 * @param resource The resource ID to inflate 11616 * @param root A view group that will be the parent. Used to properly inflate the 11617 * layout_* parameters. 11618 * @see LayoutInflater 11619 */ 11620 public static View inflate(Context context, int resource, ViewGroup root) { 11621 LayoutInflater factory = LayoutInflater.from(context); 11622 return factory.inflate(resource, root); 11623 } 11624 11625 /** 11626 * Scroll the view with standard behavior for scrolling beyond the normal 11627 * content boundaries. Views that call this method should override 11628 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 11629 * results of an over-scroll operation. 11630 * 11631 * Views can use this method to handle any touch or fling-based scrolling. 11632 * 11633 * @param deltaX Change in X in pixels 11634 * @param deltaY Change in Y in pixels 11635 * @param scrollX Current X scroll value in pixels before applying deltaX 11636 * @param scrollY Current Y scroll value in pixels before applying deltaY 11637 * @param scrollRangeX Maximum content scroll range along the X axis 11638 * @param scrollRangeY Maximum content scroll range along the Y axis 11639 * @param maxOverScrollX Number of pixels to overscroll by in either direction 11640 * along the X axis. 11641 * @param maxOverScrollY Number of pixels to overscroll by in either direction 11642 * along the Y axis. 11643 * @param isTouchEvent true if this scroll operation is the result of a touch event. 11644 * @return true if scrolling was clamped to an over-scroll boundary along either 11645 * axis, false otherwise. 11646 */ 11647 protected boolean overScrollBy(int deltaX, int deltaY, 11648 int scrollX, int scrollY, 11649 int scrollRangeX, int scrollRangeY, 11650 int maxOverScrollX, int maxOverScrollY, 11651 boolean isTouchEvent) { 11652 final int overScrollMode = mOverScrollMode; 11653 final boolean canScrollHorizontal = 11654 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 11655 final boolean canScrollVertical = 11656 computeVerticalScrollRange() > computeVerticalScrollExtent(); 11657 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 11658 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 11659 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 11660 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 11661 11662 int newScrollX = scrollX + deltaX; 11663 if (!overScrollHorizontal) { 11664 maxOverScrollX = 0; 11665 } 11666 11667 int newScrollY = scrollY + deltaY; 11668 if (!overScrollVertical) { 11669 maxOverScrollY = 0; 11670 } 11671 11672 // Clamp values if at the limits and record 11673 final int left = -maxOverScrollX; 11674 final int right = maxOverScrollX + scrollRangeX; 11675 final int top = -maxOverScrollY; 11676 final int bottom = maxOverScrollY + scrollRangeY; 11677 11678 boolean clampedX = false; 11679 if (newScrollX > right) { 11680 newScrollX = right; 11681 clampedX = true; 11682 } else if (newScrollX < left) { 11683 newScrollX = left; 11684 clampedX = true; 11685 } 11686 11687 boolean clampedY = false; 11688 if (newScrollY > bottom) { 11689 newScrollY = bottom; 11690 clampedY = true; 11691 } else if (newScrollY < top) { 11692 newScrollY = top; 11693 clampedY = true; 11694 } 11695 11696 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 11697 11698 return clampedX || clampedY; 11699 } 11700 11701 /** 11702 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 11703 * respond to the results of an over-scroll operation. 11704 * 11705 * @param scrollX New X scroll value in pixels 11706 * @param scrollY New Y scroll value in pixels 11707 * @param clampedX True if scrollX was clamped to an over-scroll boundary 11708 * @param clampedY True if scrollY was clamped to an over-scroll boundary 11709 */ 11710 protected void onOverScrolled(int scrollX, int scrollY, 11711 boolean clampedX, boolean clampedY) { 11712 // Intentionally empty. 11713 } 11714 11715 /** 11716 * Returns the over-scroll mode for this view. The result will be 11717 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11718 * (allow over-scrolling only if the view content is larger than the container), 11719 * or {@link #OVER_SCROLL_NEVER}. 11720 * 11721 * @return This view's over-scroll mode. 11722 */ 11723 public int getOverScrollMode() { 11724 return mOverScrollMode; 11725 } 11726 11727 /** 11728 * Set the over-scroll mode for this view. Valid over-scroll modes are 11729 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11730 * (allow over-scrolling only if the view content is larger than the container), 11731 * or {@link #OVER_SCROLL_NEVER}. 11732 * 11733 * Setting the over-scroll mode of a view will have an effect only if the 11734 * view is capable of scrolling. 11735 * 11736 * @param overScrollMode The new over-scroll mode for this view. 11737 */ 11738 public void setOverScrollMode(int overScrollMode) { 11739 if (overScrollMode != OVER_SCROLL_ALWAYS && 11740 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 11741 overScrollMode != OVER_SCROLL_NEVER) { 11742 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 11743 } 11744 mOverScrollMode = overScrollMode; 11745 } 11746 11747 /** 11748 * Gets a scale factor that determines the distance the view should scroll 11749 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 11750 * @return The vertical scroll scale factor. 11751 * @hide 11752 */ 11753 protected float getVerticalScrollFactor() { 11754 if (mVerticalScrollFactor == 0) { 11755 TypedValue outValue = new TypedValue(); 11756 if (!mContext.getTheme().resolveAttribute( 11757 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 11758 throw new IllegalStateException( 11759 "Expected theme to define listPreferredItemHeight."); 11760 } 11761 mVerticalScrollFactor = outValue.getDimension( 11762 mContext.getResources().getDisplayMetrics()); 11763 } 11764 return mVerticalScrollFactor; 11765 } 11766 11767 /** 11768 * Gets a scale factor that determines the distance the view should scroll 11769 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 11770 * @return The horizontal scroll scale factor. 11771 * @hide 11772 */ 11773 protected float getHorizontalScrollFactor() { 11774 // TODO: Should use something else. 11775 return getVerticalScrollFactor(); 11776 } 11777 11778 /** 11779 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 11780 * Each MeasureSpec represents a requirement for either the width or the height. 11781 * A MeasureSpec is comprised of a size and a mode. There are three possible 11782 * modes: 11783 * <dl> 11784 * <dt>UNSPECIFIED</dt> 11785 * <dd> 11786 * The parent has not imposed any constraint on the child. It can be whatever size 11787 * it wants. 11788 * </dd> 11789 * 11790 * <dt>EXACTLY</dt> 11791 * <dd> 11792 * The parent has determined an exact size for the child. The child is going to be 11793 * given those bounds regardless of how big it wants to be. 11794 * </dd> 11795 * 11796 * <dt>AT_MOST</dt> 11797 * <dd> 11798 * The child can be as large as it wants up to the specified size. 11799 * </dd> 11800 * </dl> 11801 * 11802 * MeasureSpecs are implemented as ints to reduce object allocation. This class 11803 * is provided to pack and unpack the <size, mode> tuple into the int. 11804 */ 11805 public static class MeasureSpec { 11806 private static final int MODE_SHIFT = 30; 11807 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 11808 11809 /** 11810 * Measure specification mode: The parent has not imposed any constraint 11811 * on the child. It can be whatever size it wants. 11812 */ 11813 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 11814 11815 /** 11816 * Measure specification mode: The parent has determined an exact size 11817 * for the child. The child is going to be given those bounds regardless 11818 * of how big it wants to be. 11819 */ 11820 public static final int EXACTLY = 1 << MODE_SHIFT; 11821 11822 /** 11823 * Measure specification mode: The child can be as large as it wants up 11824 * to the specified size. 11825 */ 11826 public static final int AT_MOST = 2 << MODE_SHIFT; 11827 11828 /** 11829 * Creates a measure specification based on the supplied size and mode. 11830 * 11831 * The mode must always be one of the following: 11832 * <ul> 11833 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 11834 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 11835 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 11836 * </ul> 11837 * 11838 * @param size the size of the measure specification 11839 * @param mode the mode of the measure specification 11840 * @return the measure specification based on size and mode 11841 */ 11842 public static int makeMeasureSpec(int size, int mode) { 11843 return size + mode; 11844 } 11845 11846 /** 11847 * Extracts the mode from the supplied measure specification. 11848 * 11849 * @param measureSpec the measure specification to extract the mode from 11850 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 11851 * {@link android.view.View.MeasureSpec#AT_MOST} or 11852 * {@link android.view.View.MeasureSpec#EXACTLY} 11853 */ 11854 public static int getMode(int measureSpec) { 11855 return (measureSpec & MODE_MASK); 11856 } 11857 11858 /** 11859 * Extracts the size from the supplied measure specification. 11860 * 11861 * @param measureSpec the measure specification to extract the size from 11862 * @return the size in pixels defined in the supplied measure specification 11863 */ 11864 public static int getSize(int measureSpec) { 11865 return (measureSpec & ~MODE_MASK); 11866 } 11867 11868 /** 11869 * Returns a String representation of the specified measure 11870 * specification. 11871 * 11872 * @param measureSpec the measure specification to convert to a String 11873 * @return a String with the following format: "MeasureSpec: MODE SIZE" 11874 */ 11875 public static String toString(int measureSpec) { 11876 int mode = getMode(measureSpec); 11877 int size = getSize(measureSpec); 11878 11879 StringBuilder sb = new StringBuilder("MeasureSpec: "); 11880 11881 if (mode == UNSPECIFIED) 11882 sb.append("UNSPECIFIED "); 11883 else if (mode == EXACTLY) 11884 sb.append("EXACTLY "); 11885 else if (mode == AT_MOST) 11886 sb.append("AT_MOST "); 11887 else 11888 sb.append(mode).append(" "); 11889 11890 sb.append(size); 11891 return sb.toString(); 11892 } 11893 } 11894 11895 class CheckForLongPress implements Runnable { 11896 11897 private int mOriginalWindowAttachCount; 11898 11899 public void run() { 11900 if (isPressed() && (mParent != null) 11901 && mOriginalWindowAttachCount == mWindowAttachCount) { 11902 if (performLongClick()) { 11903 mHasPerformedLongPress = true; 11904 } 11905 } 11906 } 11907 11908 public void rememberWindowAttachCount() { 11909 mOriginalWindowAttachCount = mWindowAttachCount; 11910 } 11911 } 11912 11913 private final class CheckForTap implements Runnable { 11914 public void run() { 11915 mPrivateFlags &= ~PREPRESSED; 11916 mPrivateFlags |= PRESSED; 11917 refreshDrawableState(); 11918 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 11919 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 11920 } 11921 } 11922 } 11923 11924 private final class PerformClick implements Runnable { 11925 public void run() { 11926 performClick(); 11927 } 11928 } 11929 11930 /** @hide */ 11931 public void hackTurnOffWindowResizeAnim(boolean off) { 11932 mAttachInfo.mTurnOffWindowResizeAnim = off; 11933 } 11934 11935 /** 11936 * This method returns a ViewPropertyAnimator object, which can be used to animate 11937 * specific properties on this View. 11938 * 11939 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 11940 */ 11941 public ViewPropertyAnimator animate() { 11942 if (mAnimator == null) { 11943 mAnimator = new ViewPropertyAnimator(this); 11944 } 11945 return mAnimator; 11946 } 11947 11948 /** 11949 * Interface definition for a callback to be invoked when a key event is 11950 * dispatched to this view. The callback will be invoked before the key 11951 * event is given to the view. 11952 */ 11953 public interface OnKeyListener { 11954 /** 11955 * Called when a key is dispatched to a view. This allows listeners to 11956 * get a chance to respond before the target view. 11957 * 11958 * @param v The view the key has been dispatched to. 11959 * @param keyCode The code for the physical key that was pressed 11960 * @param event The KeyEvent object containing full information about 11961 * the event. 11962 * @return True if the listener has consumed the event, false otherwise. 11963 */ 11964 boolean onKey(View v, int keyCode, KeyEvent event); 11965 } 11966 11967 /** 11968 * Interface definition for a callback to be invoked when a touch event is 11969 * dispatched to this view. The callback will be invoked before the touch 11970 * event is given to the view. 11971 */ 11972 public interface OnTouchListener { 11973 /** 11974 * Called when a touch event is dispatched to a view. This allows listeners to 11975 * get a chance to respond before the target view. 11976 * 11977 * @param v The view the touch event has been dispatched to. 11978 * @param event The MotionEvent object containing full information about 11979 * the event. 11980 * @return True if the listener has consumed the event, false otherwise. 11981 */ 11982 boolean onTouch(View v, MotionEvent event); 11983 } 11984 11985 /** 11986 * Interface definition for a callback to be invoked when a generic motion event is 11987 * dispatched to this view. The callback will be invoked before the generic motion 11988 * event is given to the view. 11989 */ 11990 public interface OnGenericMotionListener { 11991 /** 11992 * Called when a generic motion event is dispatched to a view. This allows listeners to 11993 * get a chance to respond before the target view. 11994 * 11995 * @param v The view the generic motion event has been dispatched to. 11996 * @param event The MotionEvent object containing full information about 11997 * the event. 11998 * @return True if the listener has consumed the event, false otherwise. 11999 */ 12000 boolean onGenericMotion(View v, MotionEvent event); 12001 } 12002 12003 /** 12004 * Interface definition for a callback to be invoked when a view has been clicked and held. 12005 */ 12006 public interface OnLongClickListener { 12007 /** 12008 * Called when a view has been clicked and held. 12009 * 12010 * @param v The view that was clicked and held. 12011 * 12012 * @return true if the callback consumed the long click, false otherwise. 12013 */ 12014 boolean onLongClick(View v); 12015 } 12016 12017 /** 12018 * Interface definition for a callback to be invoked when a drag is being dispatched 12019 * to this view. The callback will be invoked before the hosting view's own 12020 * onDrag(event) method. If the listener wants to fall back to the hosting view's 12021 * onDrag(event) behavior, it should return 'false' from this callback. 12022 */ 12023 public interface OnDragListener { 12024 /** 12025 * Called when a drag event is dispatched to a view. This allows listeners 12026 * to get a chance to override base View behavior. 12027 * 12028 * @param v The View that received the drag event. 12029 * @param event The {@link android.view.DragEvent} object for the drag event. 12030 * @return {@code true} if the drag event was handled successfully, or {@code false} 12031 * if the drag event was not handled. Note that {@code false} will trigger the View 12032 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 12033 */ 12034 boolean onDrag(View v, DragEvent event); 12035 } 12036 12037 /** 12038 * Interface definition for a callback to be invoked when the focus state of 12039 * a view changed. 12040 */ 12041 public interface OnFocusChangeListener { 12042 /** 12043 * Called when the focus state of a view has changed. 12044 * 12045 * @param v The view whose state has changed. 12046 * @param hasFocus The new focus state of v. 12047 */ 12048 void onFocusChange(View v, boolean hasFocus); 12049 } 12050 12051 /** 12052 * Interface definition for a callback to be invoked when a view is clicked. 12053 */ 12054 public interface OnClickListener { 12055 /** 12056 * Called when a view has been clicked. 12057 * 12058 * @param v The view that was clicked. 12059 */ 12060 void onClick(View v); 12061 } 12062 12063 /** 12064 * Interface definition for a callback to be invoked when the context menu 12065 * for this view is being built. 12066 */ 12067 public interface OnCreateContextMenuListener { 12068 /** 12069 * Called when the context menu for this view is being built. It is not 12070 * safe to hold onto the menu after this method returns. 12071 * 12072 * @param menu The context menu that is being built 12073 * @param v The view for which the context menu is being built 12074 * @param menuInfo Extra information about the item for which the 12075 * context menu should be shown. This information will vary 12076 * depending on the class of v. 12077 */ 12078 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 12079 } 12080 12081 /** 12082 * Interface definition for a callback to be invoked when the status bar changes 12083 * visibility. 12084 * 12085 * @see #setOnSystemUiVisibilityChangeListener 12086 */ 12087 public interface OnSystemUiVisibilityChangeListener { 12088 /** 12089 * Called when the status bar changes visibility because of a call to 12090 * {@link #setSystemUiVisibility}. 12091 * 12092 * @param visibility {@link #STATUS_BAR_VISIBLE} or {@link #STATUS_BAR_HIDDEN}. 12093 */ 12094 public void onSystemUiVisibilityChange(int visibility); 12095 } 12096 12097 /** 12098 * Interface definition for a callback to be invoked when this view is attached 12099 * or detached from its window. 12100 */ 12101 public interface OnAttachStateChangeListener { 12102 /** 12103 * Called when the view is attached to a window. 12104 * @param v The view that was attached 12105 */ 12106 public void onViewAttachedToWindow(View v); 12107 /** 12108 * Called when the view is detached from a window. 12109 * @param v The view that was detached 12110 */ 12111 public void onViewDetachedFromWindow(View v); 12112 } 12113 12114 private final class UnsetPressedState implements Runnable { 12115 public void run() { 12116 setPressed(false); 12117 } 12118 } 12119 12120 /** 12121 * Base class for derived classes that want to save and restore their own 12122 * state in {@link android.view.View#onSaveInstanceState()}. 12123 */ 12124 public static class BaseSavedState extends AbsSavedState { 12125 /** 12126 * Constructor used when reading from a parcel. Reads the state of the superclass. 12127 * 12128 * @param source 12129 */ 12130 public BaseSavedState(Parcel source) { 12131 super(source); 12132 } 12133 12134 /** 12135 * Constructor called by derived classes when creating their SavedState objects 12136 * 12137 * @param superState The state of the superclass of this view 12138 */ 12139 public BaseSavedState(Parcelable superState) { 12140 super(superState); 12141 } 12142 12143 public static final Parcelable.Creator<BaseSavedState> CREATOR = 12144 new Parcelable.Creator<BaseSavedState>() { 12145 public BaseSavedState createFromParcel(Parcel in) { 12146 return new BaseSavedState(in); 12147 } 12148 12149 public BaseSavedState[] newArray(int size) { 12150 return new BaseSavedState[size]; 12151 } 12152 }; 12153 } 12154 12155 /** 12156 * A set of information given to a view when it is attached to its parent 12157 * window. 12158 */ 12159 static class AttachInfo { 12160 interface Callbacks { 12161 void playSoundEffect(int effectId); 12162 boolean performHapticFeedback(int effectId, boolean always); 12163 } 12164 12165 /** 12166 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 12167 * to a Handler. This class contains the target (View) to invalidate and 12168 * the coordinates of the dirty rectangle. 12169 * 12170 * For performance purposes, this class also implements a pool of up to 12171 * POOL_LIMIT objects that get reused. This reduces memory allocations 12172 * whenever possible. 12173 */ 12174 static class InvalidateInfo implements Poolable<InvalidateInfo> { 12175 private static final int POOL_LIMIT = 10; 12176 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 12177 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 12178 public InvalidateInfo newInstance() { 12179 return new InvalidateInfo(); 12180 } 12181 12182 public void onAcquired(InvalidateInfo element) { 12183 } 12184 12185 public void onReleased(InvalidateInfo element) { 12186 } 12187 }, POOL_LIMIT) 12188 ); 12189 12190 private InvalidateInfo mNext; 12191 12192 View target; 12193 12194 int left; 12195 int top; 12196 int right; 12197 int bottom; 12198 12199 public void setNextPoolable(InvalidateInfo element) { 12200 mNext = element; 12201 } 12202 12203 public InvalidateInfo getNextPoolable() { 12204 return mNext; 12205 } 12206 12207 static InvalidateInfo acquire() { 12208 return sPool.acquire(); 12209 } 12210 12211 void release() { 12212 sPool.release(this); 12213 } 12214 } 12215 12216 final IWindowSession mSession; 12217 12218 final IWindow mWindow; 12219 12220 final IBinder mWindowToken; 12221 12222 final Callbacks mRootCallbacks; 12223 12224 Canvas mHardwareCanvas; 12225 12226 /** 12227 * The top view of the hierarchy. 12228 */ 12229 View mRootView; 12230 12231 IBinder mPanelParentWindowToken; 12232 Surface mSurface; 12233 12234 boolean mHardwareAccelerated; 12235 boolean mHardwareAccelerationRequested; 12236 HardwareRenderer mHardwareRenderer; 12237 12238 /** 12239 * Scale factor used by the compatibility mode 12240 */ 12241 float mApplicationScale; 12242 12243 /** 12244 * Indicates whether the application is in compatibility mode 12245 */ 12246 boolean mScalingRequired; 12247 12248 /** 12249 * If set, ViewRoot doesn't use its lame animation for when the window resizes. 12250 */ 12251 boolean mTurnOffWindowResizeAnim; 12252 12253 /** 12254 * Left position of this view's window 12255 */ 12256 int mWindowLeft; 12257 12258 /** 12259 * Top position of this view's window 12260 */ 12261 int mWindowTop; 12262 12263 /** 12264 * Indicates whether views need to use 32-bit drawing caches 12265 */ 12266 boolean mUse32BitDrawingCache; 12267 12268 /** 12269 * For windows that are full-screen but using insets to layout inside 12270 * of the screen decorations, these are the current insets for the 12271 * content of the window. 12272 */ 12273 final Rect mContentInsets = new Rect(); 12274 12275 /** 12276 * For windows that are full-screen but using insets to layout inside 12277 * of the screen decorations, these are the current insets for the 12278 * actual visible parts of the window. 12279 */ 12280 final Rect mVisibleInsets = new Rect(); 12281 12282 /** 12283 * The internal insets given by this window. This value is 12284 * supplied by the client (through 12285 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 12286 * be given to the window manager when changed to be used in laying 12287 * out windows behind it. 12288 */ 12289 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 12290 = new ViewTreeObserver.InternalInsetsInfo(); 12291 12292 /** 12293 * All views in the window's hierarchy that serve as scroll containers, 12294 * used to determine if the window can be resized or must be panned 12295 * to adjust for a soft input area. 12296 */ 12297 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 12298 12299 final KeyEvent.DispatcherState mKeyDispatchState 12300 = new KeyEvent.DispatcherState(); 12301 12302 /** 12303 * Indicates whether the view's window currently has the focus. 12304 */ 12305 boolean mHasWindowFocus; 12306 12307 /** 12308 * The current visibility of the window. 12309 */ 12310 int mWindowVisibility; 12311 12312 /** 12313 * Indicates the time at which drawing started to occur. 12314 */ 12315 long mDrawingTime; 12316 12317 /** 12318 * Indicates whether or not ignoring the DIRTY_MASK flags. 12319 */ 12320 boolean mIgnoreDirtyState; 12321 12322 /** 12323 * Indicates whether the view's window is currently in touch mode. 12324 */ 12325 boolean mInTouchMode; 12326 12327 /** 12328 * Indicates that ViewRoot should trigger a global layout change 12329 * the next time it performs a traversal 12330 */ 12331 boolean mRecomputeGlobalAttributes; 12332 12333 /** 12334 * Set during a traveral if any views want to keep the screen on. 12335 */ 12336 boolean mKeepScreenOn; 12337 12338 /** 12339 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 12340 */ 12341 int mSystemUiVisibility; 12342 12343 /** 12344 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 12345 * attached. 12346 */ 12347 boolean mHasSystemUiListeners; 12348 12349 /** 12350 * Set if the visibility of any views has changed. 12351 */ 12352 boolean mViewVisibilityChanged; 12353 12354 /** 12355 * Set to true if a view has been scrolled. 12356 */ 12357 boolean mViewScrollChanged; 12358 12359 /** 12360 * Global to the view hierarchy used as a temporary for dealing with 12361 * x/y points in the transparent region computations. 12362 */ 12363 final int[] mTransparentLocation = new int[2]; 12364 12365 /** 12366 * Global to the view hierarchy used as a temporary for dealing with 12367 * x/y points in the ViewGroup.invalidateChild implementation. 12368 */ 12369 final int[] mInvalidateChildLocation = new int[2]; 12370 12371 12372 /** 12373 * Global to the view hierarchy used as a temporary for dealing with 12374 * x/y location when view is transformed. 12375 */ 12376 final float[] mTmpTransformLocation = new float[2]; 12377 12378 /** 12379 * The view tree observer used to dispatch global events like 12380 * layout, pre-draw, touch mode change, etc. 12381 */ 12382 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 12383 12384 /** 12385 * A Canvas used by the view hierarchy to perform bitmap caching. 12386 */ 12387 Canvas mCanvas; 12388 12389 /** 12390 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 12391 * handler can be used to pump events in the UI events queue. 12392 */ 12393 final Handler mHandler; 12394 12395 /** 12396 * Identifier for messages requesting the view to be invalidated. 12397 * Such messages should be sent to {@link #mHandler}. 12398 */ 12399 static final int INVALIDATE_MSG = 0x1; 12400 12401 /** 12402 * Identifier for messages requesting the view to invalidate a region. 12403 * Such messages should be sent to {@link #mHandler}. 12404 */ 12405 static final int INVALIDATE_RECT_MSG = 0x2; 12406 12407 /** 12408 * Temporary for use in computing invalidate rectangles while 12409 * calling up the hierarchy. 12410 */ 12411 final Rect mTmpInvalRect = new Rect(); 12412 12413 /** 12414 * Temporary for use in computing hit areas with transformed views 12415 */ 12416 final RectF mTmpTransformRect = new RectF(); 12417 12418 /** 12419 * Temporary list for use in collecting focusable descendents of a view. 12420 */ 12421 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 12422 12423 /** 12424 * Creates a new set of attachment information with the specified 12425 * events handler and thread. 12426 * 12427 * @param handler the events handler the view must use 12428 */ 12429 AttachInfo(IWindowSession session, IWindow window, 12430 Handler handler, Callbacks effectPlayer) { 12431 mSession = session; 12432 mWindow = window; 12433 mWindowToken = window.asBinder(); 12434 mHandler = handler; 12435 mRootCallbacks = effectPlayer; 12436 } 12437 } 12438 12439 /** 12440 * <p>ScrollabilityCache holds various fields used by a View when scrolling 12441 * is supported. This avoids keeping too many unused fields in most 12442 * instances of View.</p> 12443 */ 12444 private static class ScrollabilityCache implements Runnable { 12445 12446 /** 12447 * Scrollbars are not visible 12448 */ 12449 public static final int OFF = 0; 12450 12451 /** 12452 * Scrollbars are visible 12453 */ 12454 public static final int ON = 1; 12455 12456 /** 12457 * Scrollbars are fading away 12458 */ 12459 public static final int FADING = 2; 12460 12461 public boolean fadeScrollBars; 12462 12463 public int fadingEdgeLength; 12464 public int scrollBarDefaultDelayBeforeFade; 12465 public int scrollBarFadeDuration; 12466 12467 public int scrollBarSize; 12468 public ScrollBarDrawable scrollBar; 12469 public float[] interpolatorValues; 12470 public View host; 12471 12472 public final Paint paint; 12473 public final Matrix matrix; 12474 public Shader shader; 12475 12476 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 12477 12478 private static final float[] OPAQUE = { 255 }; 12479 private static final float[] TRANSPARENT = { 0.0f }; 12480 12481 /** 12482 * When fading should start. This time moves into the future every time 12483 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 12484 */ 12485 public long fadeStartTime; 12486 12487 12488 /** 12489 * The current state of the scrollbars: ON, OFF, or FADING 12490 */ 12491 public int state = OFF; 12492 12493 private int mLastColor; 12494 12495 public ScrollabilityCache(ViewConfiguration configuration, View host) { 12496 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 12497 scrollBarSize = configuration.getScaledScrollBarSize(); 12498 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 12499 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 12500 12501 paint = new Paint(); 12502 matrix = new Matrix(); 12503 // use use a height of 1, and then wack the matrix each time we 12504 // actually use it. 12505 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 12506 12507 paint.setShader(shader); 12508 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 12509 this.host = host; 12510 } 12511 12512 public void setFadeColor(int color) { 12513 if (color != 0 && color != mLastColor) { 12514 mLastColor = color; 12515 color |= 0xFF000000; 12516 12517 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 12518 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 12519 12520 paint.setShader(shader); 12521 // Restore the default transfer mode (src_over) 12522 paint.setXfermode(null); 12523 } 12524 } 12525 12526 public void run() { 12527 long now = AnimationUtils.currentAnimationTimeMillis(); 12528 if (now >= fadeStartTime) { 12529 12530 // the animation fades the scrollbars out by changing 12531 // the opacity (alpha) from fully opaque to fully 12532 // transparent 12533 int nextFrame = (int) now; 12534 int framesCount = 0; 12535 12536 Interpolator interpolator = scrollBarInterpolator; 12537 12538 // Start opaque 12539 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 12540 12541 // End transparent 12542 nextFrame += scrollBarFadeDuration; 12543 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 12544 12545 state = FADING; 12546 12547 // Kick off the fade animation 12548 host.invalidate(true); 12549 } 12550 } 12551 12552 } 12553} 12554