View.java revision 596ba2fa791db7ae671bd79c346b54a7ea2f8113
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.view.ContextMenu.ContextMenuInfo; 61import android.view.accessibility.AccessibilityEvent; 62import android.view.accessibility.AccessibilityEventSource; 63import android.view.accessibility.AccessibilityManager; 64import android.view.animation.Animation; 65import android.view.animation.AnimationUtils; 66import android.view.inputmethod.EditorInfo; 67import android.view.inputmethod.InputConnection; 68import android.view.inputmethod.InputMethodManager; 69import android.widget.ScrollBarDrawable; 70 71import java.lang.ref.WeakReference; 72import java.lang.reflect.InvocationTargetException; 73import java.lang.reflect.Method; 74import java.util.ArrayList; 75import java.util.Arrays; 76import java.util.List; 77import java.util.WeakHashMap; 78 79/** 80 * <p> 81 * This class represents the basic building block for user interface components. A View 82 * occupies a rectangular area on the screen and is responsible for drawing and 83 * event handling. View is the base class for <em>widgets</em>, which are 84 * used to create interactive UI components (buttons, text fields, etc.). The 85 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 86 * are invisible containers that hold other Views (or other ViewGroups) and define 87 * their layout properties. 88 * </p> 89 * 90 * <div class="special"> 91 * <p>For an introduction to using this class to develop your 92 * application's user interface, read the Developer Guide documentation on 93 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 94 * include: 95 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 96 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 97 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 103 * </p> 104 * </div> 105 * 106 * <a name="Using"></a> 107 * <h3>Using Views</h3> 108 * <p> 109 * All of the views in a window are arranged in a single tree. You can add views 110 * either from code or by specifying a tree of views in one or more XML layout 111 * files. There are many specialized subclasses of views that act as controls or 112 * are capable of displaying text, images, or other content. 113 * </p> 114 * <p> 115 * Once you have created a tree of views, there are typically a few types of 116 * common operations you may wish to perform: 117 * <ul> 118 * <li><strong>Set properties:</strong> for example setting the text of a 119 * {@link android.widget.TextView}. The available properties and the methods 120 * that set them will vary among the different subclasses of views. Note that 121 * properties that are known at build time can be set in the XML layout 122 * files.</li> 123 * <li><strong>Set focus:</strong> The framework will handled moving focus in 124 * response to user input. To force focus to a specific view, call 125 * {@link #requestFocus}.</li> 126 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 127 * that will be notified when something interesting happens to the view. For 128 * example, all views will let you set a listener to be notified when the view 129 * gains or loses focus. You can register such a listener using 130 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 131 * specialized listeners. For example, a Button exposes a listener to notify 132 * clients when the button is clicked.</li> 133 * <li><strong>Set visibility:</strong> You can hide or show views using 134 * {@link #setVisibility}.</li> 135 * </ul> 136 * </p> 137 * <p><em> 138 * Note: The Android framework is responsible for measuring, laying out and 139 * drawing views. You should not call methods that perform these actions on 140 * views yourself unless you are actually implementing a 141 * {@link android.view.ViewGroup}. 142 * </em></p> 143 * 144 * <a name="Lifecycle"></a> 145 * <h3>Implementing a Custom View</h3> 146 * 147 * <p> 148 * To implement a custom view, you will usually begin by providing overrides for 149 * some of the standard methods that the framework calls on all views. You do 150 * not need to override all of these methods. In fact, you can start by just 151 * overriding {@link #onDraw(android.graphics.Canvas)}. 152 * <table border="2" width="85%" align="center" cellpadding="5"> 153 * <thead> 154 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 155 * </thead> 156 * 157 * <tbody> 158 * <tr> 159 * <td rowspan="2">Creation</td> 160 * <td>Constructors</td> 161 * <td>There is a form of the constructor that are called when the view 162 * is created from code and a form that is called when the view is 163 * inflated from a layout file. The second form should parse and apply 164 * any attributes defined in the layout file. 165 * </td> 166 * </tr> 167 * <tr> 168 * <td><code>{@link #onFinishInflate()}</code></td> 169 * <td>Called after a view and all of its children has been inflated 170 * from XML.</td> 171 * </tr> 172 * 173 * <tr> 174 * <td rowspan="3">Layout</td> 175 * <td><code>{@link #onMeasure}</code></td> 176 * <td>Called to determine the size requirements for this view and all 177 * of its children. 178 * </td> 179 * </tr> 180 * <tr> 181 * <td><code>{@link #onLayout}</code></td> 182 * <td>Called when this view should assign a size and position to all 183 * of its children. 184 * </td> 185 * </tr> 186 * <tr> 187 * <td><code>{@link #onSizeChanged}</code></td> 188 * <td>Called when the size of this view has changed. 189 * </td> 190 * </tr> 191 * 192 * <tr> 193 * <td>Drawing</td> 194 * <td><code>{@link #onDraw}</code></td> 195 * <td>Called when the view should render its content. 196 * </td> 197 * </tr> 198 * 199 * <tr> 200 * <td rowspan="4">Event processing</td> 201 * <td><code>{@link #onKeyDown}</code></td> 202 * <td>Called when a new key event occurs. 203 * </td> 204 * </tr> 205 * <tr> 206 * <td><code>{@link #onKeyUp}</code></td> 207 * <td>Called when a key up event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onTrackballEvent}</code></td> 212 * <td>Called when a trackball motion event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTouchEvent}</code></td> 217 * <td>Called when a touch screen motion event occurs. 218 * </td> 219 * </tr> 220 * 221 * <tr> 222 * <td rowspan="2">Focus</td> 223 * <td><code>{@link #onFocusChanged}</code></td> 224 * <td>Called when the view gains or loses focus. 225 * </td> 226 * </tr> 227 * 228 * <tr> 229 * <td><code>{@link #onWindowFocusChanged}</code></td> 230 * <td>Called when the window containing the view gains or loses focus. 231 * </td> 232 * </tr> 233 * 234 * <tr> 235 * <td rowspan="3">Attaching</td> 236 * <td><code>{@link #onAttachedToWindow()}</code></td> 237 * <td>Called when the view is attached to a window. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td><code>{@link #onDetachedFromWindow}</code></td> 243 * <td>Called when the view is detached from its window. 244 * </td> 245 * </tr> 246 * 247 * <tr> 248 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 249 * <td>Called when the visibility of the window containing the view 250 * has changed. 251 * </td> 252 * </tr> 253 * </tbody> 254 * 255 * </table> 256 * </p> 257 * 258 * <a name="IDs"></a> 259 * <h3>IDs</h3> 260 * Views may have an integer id associated with them. These ids are typically 261 * assigned in the layout XML files, and are used to find specific views within 262 * the view tree. A common pattern is to: 263 * <ul> 264 * <li>Define a Button in the layout file and assign it a unique ID. 265 * <pre> 266 * <Button 267 * android:id="@+id/my_button" 268 * android:layout_width="wrap_content" 269 * android:layout_height="wrap_content" 270 * android:text="@string/my_button_text"/> 271 * </pre></li> 272 * <li>From the onCreate method of an Activity, find the Button 273 * <pre class="prettyprint"> 274 * Button myButton = (Button) findViewById(R.id.my_button); 275 * </pre></li> 276 * </ul> 277 * <p> 278 * View IDs need not be unique throughout the tree, but it is good practice to 279 * ensure that they are at least unique within the part of the tree you are 280 * searching. 281 * </p> 282 * 283 * <a name="Position"></a> 284 * <h3>Position</h3> 285 * <p> 286 * The geometry of a view is that of a rectangle. A view has a location, 287 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 288 * two dimensions, expressed as a width and a height. The unit for location 289 * and dimensions is the pixel. 290 * </p> 291 * 292 * <p> 293 * It is possible to retrieve the location of a view by invoking the methods 294 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 295 * coordinate of the rectangle representing the view. The latter returns the 296 * top, or Y, coordinate of the rectangle representing the view. These methods 297 * both return the location of the view relative to its parent. For instance, 298 * when getLeft() returns 20, that means the view is located 20 pixels to the 299 * right of the left edge of its direct parent. 300 * </p> 301 * 302 * <p> 303 * In addition, several convenience methods are offered to avoid unnecessary 304 * computations, namely {@link #getRight()} and {@link #getBottom()}. 305 * These methods return the coordinates of the right and bottom edges of the 306 * rectangle representing the view. For instance, calling {@link #getRight()} 307 * is similar to the following computation: <code>getLeft() + getWidth()</code> 308 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 309 * </p> 310 * 311 * <a name="SizePaddingMargins"></a> 312 * <h3>Size, padding and margins</h3> 313 * <p> 314 * The size of a view is expressed with a width and a height. A view actually 315 * possess two pairs of width and height values. 316 * </p> 317 * 318 * <p> 319 * The first pair is known as <em>measured width</em> and 320 * <em>measured height</em>. These dimensions define how big a view wants to be 321 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 322 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 323 * and {@link #getMeasuredHeight()}. 324 * </p> 325 * 326 * <p> 327 * The second pair is simply known as <em>width</em> and <em>height</em>, or 328 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 329 * dimensions define the actual size of the view on screen, at drawing time and 330 * after layout. These values may, but do not have to, be different from the 331 * measured width and height. The width and height can be obtained by calling 332 * {@link #getWidth()} and {@link #getHeight()}. 333 * </p> 334 * 335 * <p> 336 * To measure its dimensions, a view takes into account its padding. The padding 337 * is expressed in pixels for the left, top, right and bottom parts of the view. 338 * Padding can be used to offset the content of the view by a specific amount of 339 * pixels. For instance, a left padding of 2 will push the view's content by 340 * 2 pixels to the right of the left edge. Padding can be set using the 341 * {@link #setPadding(int, int, int, int)} method and queried by calling 342 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 343 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 344 * </p> 345 * 346 * <p> 347 * Even though a view can define a padding, it does not provide any support for 348 * margins. However, view groups provide such a support. Refer to 349 * {@link android.view.ViewGroup} and 350 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 351 * </p> 352 * 353 * <a name="Layout"></a> 354 * <h3>Layout</h3> 355 * <p> 356 * Layout is a two pass process: a measure pass and a layout pass. The measuring 357 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 358 * of the view tree. Each view pushes dimension specifications down the tree 359 * during the recursion. At the end of the measure pass, every view has stored 360 * its measurements. The second pass happens in 361 * {@link #layout(int,int,int,int)} and is also top-down. During 362 * this pass each parent is responsible for positioning all of its children 363 * using the sizes computed in the measure pass. 364 * </p> 365 * 366 * <p> 367 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 368 * {@link #getMeasuredHeight()} values must be set, along with those for all of 369 * that view's descendants. A view's measured width and measured height values 370 * must respect the constraints imposed by the view's parents. This guarantees 371 * that at the end of the measure pass, all parents accept all of their 372 * children's measurements. A parent view may call measure() more than once on 373 * its children. For example, the parent may measure each child once with 374 * unspecified dimensions to find out how big they want to be, then call 375 * measure() on them again with actual numbers if the sum of all the children's 376 * unconstrained sizes is too big or too small. 377 * </p> 378 * 379 * <p> 380 * The measure pass uses two classes to communicate dimensions. The 381 * {@link MeasureSpec} class is used by views to tell their parents how they 382 * want to be measured and positioned. The base LayoutParams class just 383 * describes how big the view wants to be for both width and height. For each 384 * dimension, it can specify one of: 385 * <ul> 386 * <li> an exact number 387 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 388 * (minus padding) 389 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 390 * enclose its content (plus padding). 391 * </ul> 392 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 393 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 394 * an X and Y value. 395 * </p> 396 * 397 * <p> 398 * MeasureSpecs are used to push requirements down the tree from parent to 399 * child. A MeasureSpec can be in one of three modes: 400 * <ul> 401 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 402 * of a child view. For example, a LinearLayout may call measure() on its child 403 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 404 * tall the child view wants to be given a width of 240 pixels. 405 * <li>EXACTLY: This is used by the parent to impose an exact size on the 406 * child. The child must use this size, and guarantee that all of its 407 * descendants will fit within this size. 408 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 409 * child. The child must gurantee that it and all of its descendants will fit 410 * within this size. 411 * </ul> 412 * </p> 413 * 414 * <p> 415 * To intiate a layout, call {@link #requestLayout}. This method is typically 416 * called by a view on itself when it believes that is can no longer fit within 417 * its current bounds. 418 * </p> 419 * 420 * <a name="Drawing"></a> 421 * <h3>Drawing</h3> 422 * <p> 423 * Drawing is handled by walking the tree and rendering each view that 424 * intersects the the invalid region. Because the tree is traversed in-order, 425 * this means that parents will draw before (i.e., behind) their children, with 426 * siblings drawn in the order they appear in the tree. 427 * If you set a background drawable for a View, then the View will draw it for you 428 * before calling back to its <code>onDraw()</code> method. 429 * </p> 430 * 431 * <p> 432 * Note that the framework will not draw views that are not in the invalid region. 433 * </p> 434 * 435 * <p> 436 * To force a view to draw, call {@link #invalidate()}. 437 * </p> 438 * 439 * <a name="EventHandlingThreading"></a> 440 * <h3>Event Handling and Threading</h3> 441 * <p> 442 * The basic cycle of a view is as follows: 443 * <ol> 444 * <li>An event comes in and is dispatched to the appropriate view. The view 445 * handles the event and notifies any listeners.</li> 446 * <li>If in the course of processing the event, the view's bounds may need 447 * to be changed, the view will call {@link #requestLayout()}.</li> 448 * <li>Similarly, if in the course of processing the event the view's appearance 449 * may need to be changed, the view will call {@link #invalidate()}.</li> 450 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 451 * the framework will take care of measuring, laying out, and drawing the tree 452 * as appropriate.</li> 453 * </ol> 454 * </p> 455 * 456 * <p><em>Note: The entire view tree is single threaded. You must always be on 457 * the UI thread when calling any method on any view.</em> 458 * If you are doing work on other threads and want to update the state of a view 459 * from that thread, you should use a {@link Handler}. 460 * </p> 461 * 462 * <a name="FocusHandling"></a> 463 * <h3>Focus Handling</h3> 464 * <p> 465 * The framework will handle routine focus movement in response to user input. 466 * This includes changing the focus as views are removed or hidden, or as new 467 * views become available. Views indicate their willingness to take focus 468 * through the {@link #isFocusable} method. To change whether a view can take 469 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 470 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 471 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 472 * </p> 473 * <p> 474 * Focus movement is based on an algorithm which finds the nearest neighbor in a 475 * given direction. In rare cases, the default algorithm may not match the 476 * intended behavior of the developer. In these situations, you can provide 477 * explicit overrides by using these XML attributes in the layout file: 478 * <pre> 479 * nextFocusDown 480 * nextFocusLeft 481 * nextFocusRight 482 * nextFocusUp 483 * </pre> 484 * </p> 485 * 486 * 487 * <p> 488 * To get a particular view to take focus, call {@link #requestFocus()}. 489 * </p> 490 * 491 * <a name="TouchMode"></a> 492 * <h3>Touch Mode</h3> 493 * <p> 494 * When a user is navigating a user interface via directional keys such as a D-pad, it is 495 * necessary to give focus to actionable items such as buttons so the user can see 496 * what will take input. If the device has touch capabilities, however, and the user 497 * begins interacting with the interface by touching it, it is no longer necessary to 498 * always highlight, or give focus to, a particular view. This motivates a mode 499 * for interaction named 'touch mode'. 500 * </p> 501 * <p> 502 * For a touch capable device, once the user touches the screen, the device 503 * will enter touch mode. From this point onward, only views for which 504 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 505 * Other views that are touchable, like buttons, will not take focus when touched; they will 506 * only fire the on click listeners. 507 * </p> 508 * <p> 509 * Any time a user hits a directional key, such as a D-pad direction, the view device will 510 * exit touch mode, and find a view to take focus, so that the user may resume interacting 511 * with the user interface without touching the screen again. 512 * </p> 513 * <p> 514 * The touch mode state is maintained across {@link android.app.Activity}s. Call 515 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 516 * </p> 517 * 518 * <a name="Scrolling"></a> 519 * <h3>Scrolling</h3> 520 * <p> 521 * The framework provides basic support for views that wish to internally 522 * scroll their content. This includes keeping track of the X and Y scroll 523 * offset as well as mechanisms for drawing scrollbars. See 524 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 525 * {@link #awakenScrollBars()} for more details. 526 * </p> 527 * 528 * <a name="Tags"></a> 529 * <h3>Tags</h3> 530 * <p> 531 * Unlike IDs, tags are not used to identify views. Tags are essentially an 532 * extra piece of information that can be associated with a view. They are most 533 * often used as a convenience to store data related to views in the views 534 * themselves rather than by putting them in a separate structure. 535 * </p> 536 * 537 * <a name="Animation"></a> 538 * <h3>Animation</h3> 539 * <p> 540 * You can attach an {@link Animation} object to a view using 541 * {@link #setAnimation(Animation)} or 542 * {@link #startAnimation(Animation)}. The animation can alter the scale, 543 * rotation, translation and alpha of a view over time. If the animation is 544 * attached to a view that has children, the animation will affect the entire 545 * subtree rooted by that node. When an animation is started, the framework will 546 * take care of redrawing the appropriate views until the animation completes. 547 * </p> 548 * <p> 549 * Starting with Android 3.0, the preferred way of animating views is to use the 550 * {@link android.animation} package APIs. 551 * </p> 552 * 553 * <a name="Security"></a> 554 * <h3>Security</h3> 555 * <p> 556 * Sometimes it is essential that an application be able to verify that an action 557 * is being performed with the full knowledge and consent of the user, such as 558 * granting a permission request, making a purchase or clicking on an advertisement. 559 * Unfortunately, a malicious application could try to spoof the user into 560 * performing these actions, unaware, by concealing the intended purpose of the view. 561 * As a remedy, the framework offers a touch filtering mechanism that can be used to 562 * improve the security of views that provide access to sensitive functionality. 563 * </p><p> 564 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured} or set the 565 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 566 * will discard touches that are received whenever the view's window is obscured by 567 * another visible window. As a result, the view will not receive touches whenever a 568 * toast, dialog or other window appears above the view's window. 569 * </p><p> 570 * For more fine-grained control over security, consider overriding the 571 * {@link #onFilterTouchEventForSecurity} method to implement your own security policy. 572 * See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 573 * </p> 574 * 575 * @attr ref android.R.styleable#View_alpha 576 * @attr ref android.R.styleable#View_background 577 * @attr ref android.R.styleable#View_clickable 578 * @attr ref android.R.styleable#View_contentDescription 579 * @attr ref android.R.styleable#View_drawingCacheQuality 580 * @attr ref android.R.styleable#View_duplicateParentState 581 * @attr ref android.R.styleable#View_id 582 * @attr ref android.R.styleable#View_fadingEdge 583 * @attr ref android.R.styleable#View_fadingEdgeLength 584 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 585 * @attr ref android.R.styleable#View_fitsSystemWindows 586 * @attr ref android.R.styleable#View_isScrollContainer 587 * @attr ref android.R.styleable#View_focusable 588 * @attr ref android.R.styleable#View_focusableInTouchMode 589 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 590 * @attr ref android.R.styleable#View_keepScreenOn 591 * @attr ref android.R.styleable#View_layerType 592 * @attr ref android.R.styleable#View_longClickable 593 * @attr ref android.R.styleable#View_minHeight 594 * @attr ref android.R.styleable#View_minWidth 595 * @attr ref android.R.styleable#View_nextFocusDown 596 * @attr ref android.R.styleable#View_nextFocusLeft 597 * @attr ref android.R.styleable#View_nextFocusRight 598 * @attr ref android.R.styleable#View_nextFocusUp 599 * @attr ref android.R.styleable#View_onClick 600 * @attr ref android.R.styleable#View_padding 601 * @attr ref android.R.styleable#View_paddingBottom 602 * @attr ref android.R.styleable#View_paddingLeft 603 * @attr ref android.R.styleable#View_paddingRight 604 * @attr ref android.R.styleable#View_paddingTop 605 * @attr ref android.R.styleable#View_saveEnabled 606 * @attr ref android.R.styleable#View_rotation 607 * @attr ref android.R.styleable#View_rotationX 608 * @attr ref android.R.styleable#View_rotationY 609 * @attr ref android.R.styleable#View_scaleX 610 * @attr ref android.R.styleable#View_scaleY 611 * @attr ref android.R.styleable#View_scrollX 612 * @attr ref android.R.styleable#View_scrollY 613 * @attr ref android.R.styleable#View_scrollbarSize 614 * @attr ref android.R.styleable#View_scrollbarStyle 615 * @attr ref android.R.styleable#View_scrollbars 616 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 617 * @attr ref android.R.styleable#View_scrollbarFadeDuration 618 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 619 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbVertical 621 * @attr ref android.R.styleable#View_scrollbarTrackVertical 622 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 624 * @attr ref android.R.styleable#View_soundEffectsEnabled 625 * @attr ref android.R.styleable#View_tag 626 * @attr ref android.R.styleable#View_transformPivotX 627 * @attr ref android.R.styleable#View_transformPivotY 628 * @attr ref android.R.styleable#View_translationX 629 * @attr ref android.R.styleable#View_translationY 630 * @attr ref android.R.styleable#View_visibility 631 * 632 * @see android.view.ViewGroup 633 */ 634public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 635 private static final boolean DBG = false; 636 637 /** 638 * The logging tag used by this class with android.util.Log. 639 */ 640 protected static final String VIEW_LOG_TAG = "View"; 641 642 /** 643 * Used to mark a View that has no ID. 644 */ 645 public static final int NO_ID = -1; 646 647 /** 648 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 649 * calling setFlags. 650 */ 651 private static final int NOT_FOCUSABLE = 0x00000000; 652 653 /** 654 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 655 * setFlags. 656 */ 657 private static final int FOCUSABLE = 0x00000001; 658 659 /** 660 * Mask for use with setFlags indicating bits used for focus. 661 */ 662 private static final int FOCUSABLE_MASK = 0x00000001; 663 664 /** 665 * This view will adjust its padding to fit sytem windows (e.g. status bar) 666 */ 667 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 668 669 /** 670 * This view is visible. Use with {@link #setVisibility}. 671 */ 672 public static final int VISIBLE = 0x00000000; 673 674 /** 675 * This view is invisible, but it still takes up space for layout purposes. 676 * Use with {@link #setVisibility}. 677 */ 678 public static final int INVISIBLE = 0x00000004; 679 680 /** 681 * This view is invisible, and it doesn't take any space for layout 682 * purposes. Use with {@link #setVisibility}. 683 */ 684 public static final int GONE = 0x00000008; 685 686 /** 687 * Mask for use with setFlags indicating bits used for visibility. 688 * {@hide} 689 */ 690 static final int VISIBILITY_MASK = 0x0000000C; 691 692 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 693 694 /** 695 * This view is enabled. Intrepretation varies by subclass. 696 * Use with ENABLED_MASK when calling setFlags. 697 * {@hide} 698 */ 699 static final int ENABLED = 0x00000000; 700 701 /** 702 * This view is disabled. Intrepretation varies by subclass. 703 * Use with ENABLED_MASK when calling setFlags. 704 * {@hide} 705 */ 706 static final int DISABLED = 0x00000020; 707 708 /** 709 * Mask for use with setFlags indicating bits used for indicating whether 710 * this view is enabled 711 * {@hide} 712 */ 713 static final int ENABLED_MASK = 0x00000020; 714 715 /** 716 * This view won't draw. {@link #onDraw} won't be called and further 717 * optimizations 718 * will be performed. It is okay to have this flag set and a background. 719 * Use with DRAW_MASK when calling setFlags. 720 * {@hide} 721 */ 722 static final int WILL_NOT_DRAW = 0x00000080; 723 724 /** 725 * Mask for use with setFlags indicating bits used for indicating whether 726 * this view is will draw 727 * {@hide} 728 */ 729 static final int DRAW_MASK = 0x00000080; 730 731 /** 732 * <p>This view doesn't show scrollbars.</p> 733 * {@hide} 734 */ 735 static final int SCROLLBARS_NONE = 0x00000000; 736 737 /** 738 * <p>This view shows horizontal scrollbars.</p> 739 * {@hide} 740 */ 741 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 742 743 /** 744 * <p>This view shows vertical scrollbars.</p> 745 * {@hide} 746 */ 747 static final int SCROLLBARS_VERTICAL = 0x00000200; 748 749 /** 750 * <p>Mask for use with setFlags indicating bits used for indicating which 751 * scrollbars are enabled.</p> 752 * {@hide} 753 */ 754 static final int SCROLLBARS_MASK = 0x00000300; 755 756 /** 757 * Indicates that the view should filter touches when its window is obscured. 758 * Refer to the class comments for more information about this security feature. 759 * {@hide} 760 */ 761 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 762 763 // note flag value 0x00000800 is now available for next flags... 764 765 /** 766 * <p>This view doesn't show fading edges.</p> 767 * {@hide} 768 */ 769 static final int FADING_EDGE_NONE = 0x00000000; 770 771 /** 772 * <p>This view shows horizontal fading edges.</p> 773 * {@hide} 774 */ 775 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 776 777 /** 778 * <p>This view shows vertical fading edges.</p> 779 * {@hide} 780 */ 781 static final int FADING_EDGE_VERTICAL = 0x00002000; 782 783 /** 784 * <p>Mask for use with setFlags indicating bits used for indicating which 785 * fading edges are enabled.</p> 786 * {@hide} 787 */ 788 static final int FADING_EDGE_MASK = 0x00003000; 789 790 /** 791 * <p>Indicates this view can be clicked. When clickable, a View reacts 792 * to clicks by notifying the OnClickListener.<p> 793 * {@hide} 794 */ 795 static final int CLICKABLE = 0x00004000; 796 797 /** 798 * <p>Indicates this view is caching its drawing into a bitmap.</p> 799 * {@hide} 800 */ 801 static final int DRAWING_CACHE_ENABLED = 0x00008000; 802 803 /** 804 * <p>Indicates that no icicle should be saved for this view.<p> 805 * {@hide} 806 */ 807 static final int SAVE_DISABLED = 0x000010000; 808 809 /** 810 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 811 * property.</p> 812 * {@hide} 813 */ 814 static final int SAVE_DISABLED_MASK = 0x000010000; 815 816 /** 817 * <p>Indicates that no drawing cache should ever be created for this view.<p> 818 * {@hide} 819 */ 820 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 821 822 /** 823 * <p>Indicates this view can take / keep focus when int touch mode.</p> 824 * {@hide} 825 */ 826 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 827 828 /** 829 * <p>Enables low quality mode for the drawing cache.</p> 830 */ 831 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 832 833 /** 834 * <p>Enables high quality mode for the drawing cache.</p> 835 */ 836 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 837 838 /** 839 * <p>Enables automatic quality mode for the drawing cache.</p> 840 */ 841 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 842 843 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 844 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 845 }; 846 847 /** 848 * <p>Mask for use with setFlags indicating bits used for the cache 849 * quality property.</p> 850 * {@hide} 851 */ 852 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 853 854 /** 855 * <p> 856 * Indicates this view can be long clicked. When long clickable, a View 857 * reacts to long clicks by notifying the OnLongClickListener or showing a 858 * context menu. 859 * </p> 860 * {@hide} 861 */ 862 static final int LONG_CLICKABLE = 0x00200000; 863 864 /** 865 * <p>Indicates that this view gets its drawable states from its direct parent 866 * and ignores its original internal states.</p> 867 * 868 * @hide 869 */ 870 static final int DUPLICATE_PARENT_STATE = 0x00400000; 871 872 /** 873 * The scrollbar style to display the scrollbars inside the content area, 874 * without increasing the padding. The scrollbars will be overlaid with 875 * translucency on the view's content. 876 */ 877 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 878 879 /** 880 * The scrollbar style to display the scrollbars inside the padded area, 881 * increasing the padding of the view. The scrollbars will not overlap the 882 * content area of the view. 883 */ 884 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 885 886 /** 887 * The scrollbar style to display the scrollbars at the edge of the view, 888 * without increasing the padding. The scrollbars will be overlaid with 889 * translucency. 890 */ 891 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 892 893 /** 894 * The scrollbar style to display the scrollbars at the edge of the view, 895 * increasing the padding of the view. The scrollbars will only overlap the 896 * background, if any. 897 */ 898 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 899 900 /** 901 * Mask to check if the scrollbar style is overlay or inset. 902 * {@hide} 903 */ 904 static final int SCROLLBARS_INSET_MASK = 0x01000000; 905 906 /** 907 * Mask to check if the scrollbar style is inside or outside. 908 * {@hide} 909 */ 910 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 911 912 /** 913 * Mask for scrollbar style. 914 * {@hide} 915 */ 916 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 917 918 /** 919 * View flag indicating that the screen should remain on while the 920 * window containing this view is visible to the user. This effectively 921 * takes care of automatically setting the WindowManager's 922 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 923 */ 924 public static final int KEEP_SCREEN_ON = 0x04000000; 925 926 /** 927 * View flag indicating whether this view should have sound effects enabled 928 * for events such as clicking and touching. 929 */ 930 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 931 932 /** 933 * View flag indicating whether this view should have haptic feedback 934 * enabled for events such as long presses. 935 */ 936 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 937 938 /** 939 * <p>Indicates that the view hierarchy should stop saving state when 940 * it reaches this view. If state saving is initiated immediately at 941 * the view, it will be allowed. 942 * {@hide} 943 */ 944 static final int PARENT_SAVE_DISABLED = 0x20000000; 945 946 /** 947 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 948 * {@hide} 949 */ 950 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 951 952 /** 953 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 954 * should add all focusable Views regardless if they are focusable in touch mode. 955 */ 956 public static final int FOCUSABLES_ALL = 0x00000000; 957 958 /** 959 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 960 * should add only Views focusable in touch mode. 961 */ 962 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 963 964 /** 965 * Use with {@link #focusSearch}. Move focus to the previous selectable 966 * item. 967 */ 968 public static final int FOCUS_BACKWARD = 0x00000001; 969 970 /** 971 * Use with {@link #focusSearch}. Move focus to the next selectable 972 * item. 973 */ 974 public static final int FOCUS_FORWARD = 0x00000002; 975 976 /** 977 * Use with {@link #focusSearch}. Move focus to the left. 978 */ 979 public static final int FOCUS_LEFT = 0x00000011; 980 981 /** 982 * Use with {@link #focusSearch}. Move focus up. 983 */ 984 public static final int FOCUS_UP = 0x00000021; 985 986 /** 987 * Use with {@link #focusSearch}. Move focus to the right. 988 */ 989 public static final int FOCUS_RIGHT = 0x00000042; 990 991 /** 992 * Use with {@link #focusSearch}. Move focus down. 993 */ 994 public static final int FOCUS_DOWN = 0x00000082; 995 996 /** 997 * Bits of {@link #getMeasuredWidthAndState()} and 998 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 999 */ 1000 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1001 1002 /** 1003 * Bits of {@link #getMeasuredWidthAndState()} and 1004 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1005 */ 1006 public static final int MEASURED_STATE_MASK = 0xff000000; 1007 1008 /** 1009 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1010 * for functions that combine both width and height into a single int, 1011 * such as {@link #getMeasuredState()} and the childState argument of 1012 * {@link #resolveSizeAndState(int, int, int)}. 1013 */ 1014 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1015 1016 /** 1017 * Bit of {@link #getMeasuredWidthAndState()} and 1018 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1019 * is smaller that the space the view would like to have. 1020 */ 1021 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1022 1023 /** 1024 * Base View state sets 1025 */ 1026 // Singles 1027 /** 1028 * Indicates the view has no states set. States are used with 1029 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1030 * view depending on its state. 1031 * 1032 * @see android.graphics.drawable.Drawable 1033 * @see #getDrawableState() 1034 */ 1035 protected static final int[] EMPTY_STATE_SET; 1036 /** 1037 * Indicates the view is enabled. States are used with 1038 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1039 * view depending on its state. 1040 * 1041 * @see android.graphics.drawable.Drawable 1042 * @see #getDrawableState() 1043 */ 1044 protected static final int[] ENABLED_STATE_SET; 1045 /** 1046 * Indicates the view is focused. States are used with 1047 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1048 * view depending on its state. 1049 * 1050 * @see android.graphics.drawable.Drawable 1051 * @see #getDrawableState() 1052 */ 1053 protected static final int[] FOCUSED_STATE_SET; 1054 /** 1055 * Indicates the view is selected. States are used with 1056 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1057 * view depending on its state. 1058 * 1059 * @see android.graphics.drawable.Drawable 1060 * @see #getDrawableState() 1061 */ 1062 protected static final int[] SELECTED_STATE_SET; 1063 /** 1064 * Indicates the view is pressed. States are used with 1065 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1066 * view depending on its state. 1067 * 1068 * @see android.graphics.drawable.Drawable 1069 * @see #getDrawableState() 1070 * @hide 1071 */ 1072 protected static final int[] PRESSED_STATE_SET; 1073 /** 1074 * Indicates the view's window has focus. States are used with 1075 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1076 * view depending on its state. 1077 * 1078 * @see android.graphics.drawable.Drawable 1079 * @see #getDrawableState() 1080 */ 1081 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1082 // Doubles 1083 /** 1084 * Indicates the view is enabled and has the focus. 1085 * 1086 * @see #ENABLED_STATE_SET 1087 * @see #FOCUSED_STATE_SET 1088 */ 1089 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1090 /** 1091 * Indicates the view is enabled and selected. 1092 * 1093 * @see #ENABLED_STATE_SET 1094 * @see #SELECTED_STATE_SET 1095 */ 1096 protected static final int[] ENABLED_SELECTED_STATE_SET; 1097 /** 1098 * Indicates the view is enabled and that its window has focus. 1099 * 1100 * @see #ENABLED_STATE_SET 1101 * @see #WINDOW_FOCUSED_STATE_SET 1102 */ 1103 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1104 /** 1105 * Indicates the view is focused and selected. 1106 * 1107 * @see #FOCUSED_STATE_SET 1108 * @see #SELECTED_STATE_SET 1109 */ 1110 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1111 /** 1112 * Indicates the view has the focus and that its window has the focus. 1113 * 1114 * @see #FOCUSED_STATE_SET 1115 * @see #WINDOW_FOCUSED_STATE_SET 1116 */ 1117 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1118 /** 1119 * Indicates the view is selected and that its window has the focus. 1120 * 1121 * @see #SELECTED_STATE_SET 1122 * @see #WINDOW_FOCUSED_STATE_SET 1123 */ 1124 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1125 // Triples 1126 /** 1127 * Indicates the view is enabled, focused and selected. 1128 * 1129 * @see #ENABLED_STATE_SET 1130 * @see #FOCUSED_STATE_SET 1131 * @see #SELECTED_STATE_SET 1132 */ 1133 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1134 /** 1135 * Indicates the view is enabled, focused and its window has the focus. 1136 * 1137 * @see #ENABLED_STATE_SET 1138 * @see #FOCUSED_STATE_SET 1139 * @see #WINDOW_FOCUSED_STATE_SET 1140 */ 1141 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1142 /** 1143 * Indicates the view is enabled, selected and its window has the focus. 1144 * 1145 * @see #ENABLED_STATE_SET 1146 * @see #SELECTED_STATE_SET 1147 * @see #WINDOW_FOCUSED_STATE_SET 1148 */ 1149 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1150 /** 1151 * Indicates the view is focused, selected and its window has the focus. 1152 * 1153 * @see #FOCUSED_STATE_SET 1154 * @see #SELECTED_STATE_SET 1155 * @see #WINDOW_FOCUSED_STATE_SET 1156 */ 1157 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1158 /** 1159 * Indicates the view is enabled, focused, selected and its window 1160 * has the focus. 1161 * 1162 * @see #ENABLED_STATE_SET 1163 * @see #FOCUSED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 * @see #WINDOW_FOCUSED_STATE_SET 1166 */ 1167 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1168 /** 1169 * Indicates the view is pressed and its window has the focus. 1170 * 1171 * @see #PRESSED_STATE_SET 1172 * @see #WINDOW_FOCUSED_STATE_SET 1173 */ 1174 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1175 /** 1176 * Indicates the view is pressed and selected. 1177 * 1178 * @see #PRESSED_STATE_SET 1179 * @see #SELECTED_STATE_SET 1180 */ 1181 protected static final int[] PRESSED_SELECTED_STATE_SET; 1182 /** 1183 * Indicates the view is pressed, selected and its window has the focus. 1184 * 1185 * @see #PRESSED_STATE_SET 1186 * @see #SELECTED_STATE_SET 1187 * @see #WINDOW_FOCUSED_STATE_SET 1188 */ 1189 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1190 /** 1191 * Indicates the view is pressed and focused. 1192 * 1193 * @see #PRESSED_STATE_SET 1194 * @see #FOCUSED_STATE_SET 1195 */ 1196 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1197 /** 1198 * Indicates the view is pressed, focused and its window has the focus. 1199 * 1200 * @see #PRESSED_STATE_SET 1201 * @see #FOCUSED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is pressed, focused and selected. 1207 * 1208 * @see #PRESSED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1213 /** 1214 * Indicates the view is pressed, focused, selected and its window has the focus. 1215 * 1216 * @see #PRESSED_STATE_SET 1217 * @see #FOCUSED_STATE_SET 1218 * @see #SELECTED_STATE_SET 1219 * @see #WINDOW_FOCUSED_STATE_SET 1220 */ 1221 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1222 /** 1223 * Indicates the view is pressed and enabled. 1224 * 1225 * @see #PRESSED_STATE_SET 1226 * @see #ENABLED_STATE_SET 1227 */ 1228 protected static final int[] PRESSED_ENABLED_STATE_SET; 1229 /** 1230 * Indicates the view is pressed, enabled and its window has the focus. 1231 * 1232 * @see #PRESSED_STATE_SET 1233 * @see #ENABLED_STATE_SET 1234 * @see #WINDOW_FOCUSED_STATE_SET 1235 */ 1236 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1237 /** 1238 * Indicates the view is pressed, enabled and selected. 1239 * 1240 * @see #PRESSED_STATE_SET 1241 * @see #ENABLED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed, enabled, selected and its window has the 1247 * focus. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #ENABLED_STATE_SET 1251 * @see #SELECTED_STATE_SET 1252 * @see #WINDOW_FOCUSED_STATE_SET 1253 */ 1254 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1255 /** 1256 * Indicates the view is pressed, enabled and focused. 1257 * 1258 * @see #PRESSED_STATE_SET 1259 * @see #ENABLED_STATE_SET 1260 * @see #FOCUSED_STATE_SET 1261 */ 1262 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1263 /** 1264 * Indicates the view is pressed, enabled, focused and its window has the 1265 * focus. 1266 * 1267 * @see #PRESSED_STATE_SET 1268 * @see #ENABLED_STATE_SET 1269 * @see #FOCUSED_STATE_SET 1270 * @see #WINDOW_FOCUSED_STATE_SET 1271 */ 1272 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1273 /** 1274 * Indicates the view is pressed, enabled, focused and selected. 1275 * 1276 * @see #PRESSED_STATE_SET 1277 * @see #ENABLED_STATE_SET 1278 * @see #SELECTED_STATE_SET 1279 * @see #FOCUSED_STATE_SET 1280 */ 1281 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1282 /** 1283 * Indicates the view is pressed, enabled, focused, selected and its window 1284 * has the focus. 1285 * 1286 * @see #PRESSED_STATE_SET 1287 * @see #ENABLED_STATE_SET 1288 * @see #SELECTED_STATE_SET 1289 * @see #FOCUSED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1293 1294 /** 1295 * The order here is very important to {@link #getDrawableState()} 1296 */ 1297 private static final int[][] VIEW_STATE_SETS; 1298 1299 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1300 static final int VIEW_STATE_SELECTED = 1 << 1; 1301 static final int VIEW_STATE_FOCUSED = 1 << 2; 1302 static final int VIEW_STATE_ENABLED = 1 << 3; 1303 static final int VIEW_STATE_PRESSED = 1 << 4; 1304 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1305 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1306 1307 static final int[] VIEW_STATE_IDS = new int[] { 1308 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1309 R.attr.state_selected, VIEW_STATE_SELECTED, 1310 R.attr.state_focused, VIEW_STATE_FOCUSED, 1311 R.attr.state_enabled, VIEW_STATE_ENABLED, 1312 R.attr.state_pressed, VIEW_STATE_PRESSED, 1313 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1314 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1315 }; 1316 1317 static { 1318 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1319 throw new IllegalStateException( 1320 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1321 } 1322 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1323 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1324 int viewState = R.styleable.ViewDrawableStates[i]; 1325 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1326 if (VIEW_STATE_IDS[j] == viewState) { 1327 orderedIds[i * 2] = viewState; 1328 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1329 } 1330 } 1331 } 1332 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1333 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1334 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1335 int numBits = Integer.bitCount(i); 1336 int[] set = new int[numBits]; 1337 int pos = 0; 1338 for (int j = 0; j < orderedIds.length; j += 2) { 1339 if ((i & orderedIds[j+1]) != 0) { 1340 set[pos++] = orderedIds[j]; 1341 } 1342 } 1343 VIEW_STATE_SETS[i] = set; 1344 } 1345 1346 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1347 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1348 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1349 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1350 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1351 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1352 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1353 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1354 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1355 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1356 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1357 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1358 | VIEW_STATE_FOCUSED]; 1359 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1360 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1361 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1362 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1363 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1364 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1365 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1366 | VIEW_STATE_ENABLED]; 1367 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1368 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1369 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1370 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1371 | VIEW_STATE_ENABLED]; 1372 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1373 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1374 | VIEW_STATE_ENABLED]; 1375 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1376 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1377 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1378 1379 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1380 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1381 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1382 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1383 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1384 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1385 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1386 | VIEW_STATE_PRESSED]; 1387 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1388 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1389 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1390 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1391 | VIEW_STATE_PRESSED]; 1392 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1393 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1394 | VIEW_STATE_PRESSED]; 1395 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1396 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1397 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1398 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1399 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1400 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1401 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1402 | VIEW_STATE_PRESSED]; 1403 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1404 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1405 | VIEW_STATE_PRESSED]; 1406 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1407 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1408 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1409 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1410 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1411 | VIEW_STATE_PRESSED]; 1412 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1413 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1414 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1415 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1417 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1418 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1421 | VIEW_STATE_PRESSED]; 1422 } 1423 1424 /** 1425 * Used by views that contain lists of items. This state indicates that 1426 * the view is showing the last item. 1427 * @hide 1428 */ 1429 protected static final int[] LAST_STATE_SET = {R.attr.state_last}; 1430 /** 1431 * Used by views that contain lists of items. This state indicates that 1432 * the view is showing the first item. 1433 * @hide 1434 */ 1435 protected static final int[] FIRST_STATE_SET = {R.attr.state_first}; 1436 /** 1437 * Used by views that contain lists of items. This state indicates that 1438 * the view is showing the middle item. 1439 * @hide 1440 */ 1441 protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle}; 1442 /** 1443 * Used by views that contain lists of items. This state indicates that 1444 * the view is showing only one item. 1445 * @hide 1446 */ 1447 protected static final int[] SINGLE_STATE_SET = {R.attr.state_single}; 1448 /** 1449 * Used by views that contain lists of items. This state indicates that 1450 * the view is pressed and showing the last item. 1451 * @hide 1452 */ 1453 protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed}; 1454 /** 1455 * Used by views that contain lists of items. This state indicates that 1456 * the view is pressed and showing the first item. 1457 * @hide 1458 */ 1459 protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed}; 1460 /** 1461 * Used by views that contain lists of items. This state indicates that 1462 * the view is pressed and showing the middle item. 1463 * @hide 1464 */ 1465 protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed}; 1466 /** 1467 * Used by views that contain lists of items. This state indicates that 1468 * the view is pressed and showing only one item. 1469 * @hide 1470 */ 1471 protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed}; 1472 1473 /** 1474 * Temporary Rect currently for use in setBackground(). This will probably 1475 * be extended in the future to hold our own class with more than just 1476 * a Rect. :) 1477 */ 1478 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1479 1480 /** 1481 * Map used to store views' tags. 1482 */ 1483 private static WeakHashMap<View, SparseArray<Object>> sTags; 1484 1485 /** 1486 * Lock used to access sTags. 1487 */ 1488 private static final Object sTagsLock = new Object(); 1489 1490 /** 1491 * The animation currently associated with this view. 1492 * @hide 1493 */ 1494 protected Animation mCurrentAnimation = null; 1495 1496 /** 1497 * Width as measured during measure pass. 1498 * {@hide} 1499 */ 1500 @ViewDebug.ExportedProperty(category = "measurement") 1501 /*package*/ int mMeasuredWidth; 1502 1503 /** 1504 * Height as measured during measure pass. 1505 * {@hide} 1506 */ 1507 @ViewDebug.ExportedProperty(category = "measurement") 1508 /*package*/ int mMeasuredHeight; 1509 1510 /** 1511 * The view's identifier. 1512 * {@hide} 1513 * 1514 * @see #setId(int) 1515 * @see #getId() 1516 */ 1517 @ViewDebug.ExportedProperty(resolveId = true) 1518 int mID = NO_ID; 1519 1520 /** 1521 * The view's tag. 1522 * {@hide} 1523 * 1524 * @see #setTag(Object) 1525 * @see #getTag() 1526 */ 1527 protected Object mTag; 1528 1529 // for mPrivateFlags: 1530 /** {@hide} */ 1531 static final int WANTS_FOCUS = 0x00000001; 1532 /** {@hide} */ 1533 static final int FOCUSED = 0x00000002; 1534 /** {@hide} */ 1535 static final int SELECTED = 0x00000004; 1536 /** {@hide} */ 1537 static final int IS_ROOT_NAMESPACE = 0x00000008; 1538 /** {@hide} */ 1539 static final int HAS_BOUNDS = 0x00000010; 1540 /** {@hide} */ 1541 static final int DRAWN = 0x00000020; 1542 /** 1543 * When this flag is set, this view is running an animation on behalf of its 1544 * children and should therefore not cancel invalidate requests, even if they 1545 * lie outside of this view's bounds. 1546 * 1547 * {@hide} 1548 */ 1549 static final int DRAW_ANIMATION = 0x00000040; 1550 /** {@hide} */ 1551 static final int SKIP_DRAW = 0x00000080; 1552 /** {@hide} */ 1553 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1554 /** {@hide} */ 1555 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1556 /** {@hide} */ 1557 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1558 /** {@hide} */ 1559 static final int MEASURED_DIMENSION_SET = 0x00000800; 1560 /** {@hide} */ 1561 static final int FORCE_LAYOUT = 0x00001000; 1562 /** {@hide} */ 1563 static final int LAYOUT_REQUIRED = 0x00002000; 1564 1565 private static final int PRESSED = 0x00004000; 1566 1567 /** {@hide} */ 1568 static final int DRAWING_CACHE_VALID = 0x00008000; 1569 /** 1570 * Flag used to indicate that this view should be drawn once more (and only once 1571 * more) after its animation has completed. 1572 * {@hide} 1573 */ 1574 static final int ANIMATION_STARTED = 0x00010000; 1575 1576 private static final int SAVE_STATE_CALLED = 0x00020000; 1577 1578 /** 1579 * Indicates that the View returned true when onSetAlpha() was called and that 1580 * the alpha must be restored. 1581 * {@hide} 1582 */ 1583 static final int ALPHA_SET = 0x00040000; 1584 1585 /** 1586 * Set by {@link #setScrollContainer(boolean)}. 1587 */ 1588 static final int SCROLL_CONTAINER = 0x00080000; 1589 1590 /** 1591 * Set by {@link #setScrollContainer(boolean)}. 1592 */ 1593 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1594 1595 /** 1596 * View flag indicating whether this view was invalidated (fully or partially.) 1597 * 1598 * @hide 1599 */ 1600 static final int DIRTY = 0x00200000; 1601 1602 /** 1603 * View flag indicating whether this view was invalidated by an opaque 1604 * invalidate request. 1605 * 1606 * @hide 1607 */ 1608 static final int DIRTY_OPAQUE = 0x00400000; 1609 1610 /** 1611 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1612 * 1613 * @hide 1614 */ 1615 static final int DIRTY_MASK = 0x00600000; 1616 1617 /** 1618 * Indicates whether the background is opaque. 1619 * 1620 * @hide 1621 */ 1622 static final int OPAQUE_BACKGROUND = 0x00800000; 1623 1624 /** 1625 * Indicates whether the scrollbars are opaque. 1626 * 1627 * @hide 1628 */ 1629 static final int OPAQUE_SCROLLBARS = 0x01000000; 1630 1631 /** 1632 * Indicates whether the view is opaque. 1633 * 1634 * @hide 1635 */ 1636 static final int OPAQUE_MASK = 0x01800000; 1637 1638 /** 1639 * Indicates a prepressed state; 1640 * the short time between ACTION_DOWN and recognizing 1641 * a 'real' press. Prepressed is used to recognize quick taps 1642 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1643 * 1644 * @hide 1645 */ 1646 private static final int PREPRESSED = 0x02000000; 1647 1648 /** 1649 * Indicates whether the view is temporarily detached. 1650 * 1651 * @hide 1652 */ 1653 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1654 1655 /** 1656 * Indicates that we should awaken scroll bars once attached 1657 * 1658 * @hide 1659 */ 1660 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1661 1662 /** 1663 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1664 * for transform operations 1665 * 1666 * @hide 1667 */ 1668 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1669 1670 /** {@hide} */ 1671 static final int ACTIVATED = 0x40000000; 1672 1673 /** 1674 * Always allow a user to over-scroll this view, provided it is a 1675 * view that can scroll. 1676 * 1677 * @see #getOverScrollMode() 1678 * @see #setOverScrollMode(int) 1679 */ 1680 public static final int OVER_SCROLL_ALWAYS = 0; 1681 1682 /** 1683 * Allow a user to over-scroll this view only if the content is large 1684 * enough to meaningfully scroll, provided it is a view that can scroll. 1685 * 1686 * @see #getOverScrollMode() 1687 * @see #setOverScrollMode(int) 1688 */ 1689 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1690 1691 /** 1692 * Never allow a user to over-scroll this view. 1693 * 1694 * @see #getOverScrollMode() 1695 * @see #setOverScrollMode(int) 1696 */ 1697 public static final int OVER_SCROLL_NEVER = 2; 1698 1699 /** 1700 * Controls the over-scroll mode for this view. 1701 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1702 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1703 * and {@link #OVER_SCROLL_NEVER}. 1704 */ 1705 private int mOverScrollMode; 1706 1707 /** 1708 * The parent this view is attached to. 1709 * {@hide} 1710 * 1711 * @see #getParent() 1712 */ 1713 protected ViewParent mParent; 1714 1715 /** 1716 * {@hide} 1717 */ 1718 AttachInfo mAttachInfo; 1719 1720 /** 1721 * {@hide} 1722 */ 1723 @ViewDebug.ExportedProperty(flagMapping = { 1724 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1725 name = "FORCE_LAYOUT"), 1726 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1727 name = "LAYOUT_REQUIRED"), 1728 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1729 name = "DRAWING_CACHE_INVALID", outputIf = false), 1730 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1731 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1732 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1733 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1734 }) 1735 int mPrivateFlags; 1736 1737 /** 1738 * Count of how many windows this view has been attached to. 1739 */ 1740 int mWindowAttachCount; 1741 1742 /** 1743 * The layout parameters associated with this view and used by the parent 1744 * {@link android.view.ViewGroup} to determine how this view should be 1745 * laid out. 1746 * {@hide} 1747 */ 1748 protected ViewGroup.LayoutParams mLayoutParams; 1749 1750 /** 1751 * The view flags hold various views states. 1752 * {@hide} 1753 */ 1754 @ViewDebug.ExportedProperty 1755 int mViewFlags; 1756 1757 /** 1758 * The transform matrix for the View. This transform is calculated internally 1759 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1760 * is used by default. Do *not* use this variable directly; instead call 1761 * getMatrix(), which will automatically recalculate the matrix if necessary 1762 * to get the correct matrix based on the latest rotation and scale properties. 1763 */ 1764 private final Matrix mMatrix = new Matrix(); 1765 1766 /** 1767 * The transform matrix for the View. This transform is calculated internally 1768 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1769 * is used by default. Do *not* use this variable directly; instead call 1770 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1771 * to get the correct matrix based on the latest rotation and scale properties. 1772 */ 1773 private Matrix mInverseMatrix; 1774 1775 /** 1776 * An internal variable that tracks whether we need to recalculate the 1777 * transform matrix, based on whether the rotation or scaleX/Y properties 1778 * have changed since the matrix was last calculated. 1779 */ 1780 private boolean mMatrixDirty = false; 1781 1782 /** 1783 * An internal variable that tracks whether we need to recalculate the 1784 * transform matrix, based on whether the rotation or scaleX/Y properties 1785 * have changed since the matrix was last calculated. 1786 */ 1787 private boolean mInverseMatrixDirty = true; 1788 1789 /** 1790 * A variable that tracks whether we need to recalculate the 1791 * transform matrix, based on whether the rotation or scaleX/Y properties 1792 * have changed since the matrix was last calculated. This variable 1793 * is only valid after a call to updateMatrix() or to a function that 1794 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1795 */ 1796 private boolean mMatrixIsIdentity = true; 1797 1798 /** 1799 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1800 */ 1801 private Camera mCamera = null; 1802 1803 /** 1804 * This matrix is used when computing the matrix for 3D rotations. 1805 */ 1806 private Matrix matrix3D = null; 1807 1808 /** 1809 * These prev values are used to recalculate a centered pivot point when necessary. The 1810 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1811 * set), so thes values are only used then as well. 1812 */ 1813 private int mPrevWidth = -1; 1814 private int mPrevHeight = -1; 1815 1816 private boolean mLastIsOpaque; 1817 1818 /** 1819 * Convenience value to check for float values that are close enough to zero to be considered 1820 * zero. 1821 */ 1822 private static final float NONZERO_EPSILON = .001f; 1823 1824 /** 1825 * The degrees rotation around the vertical axis through the pivot point. 1826 */ 1827 @ViewDebug.ExportedProperty 1828 private float mRotationY = 0f; 1829 1830 /** 1831 * The degrees rotation around the horizontal axis through the pivot point. 1832 */ 1833 @ViewDebug.ExportedProperty 1834 private float mRotationX = 0f; 1835 1836 /** 1837 * The degrees rotation around the pivot point. 1838 */ 1839 @ViewDebug.ExportedProperty 1840 private float mRotation = 0f; 1841 1842 /** 1843 * The amount of translation of the object away from its left property (post-layout). 1844 */ 1845 @ViewDebug.ExportedProperty 1846 private float mTranslationX = 0f; 1847 1848 /** 1849 * The amount of translation of the object away from its top property (post-layout). 1850 */ 1851 @ViewDebug.ExportedProperty 1852 private float mTranslationY = 0f; 1853 1854 /** 1855 * The amount of scale in the x direction around the pivot point. A 1856 * value of 1 means no scaling is applied. 1857 */ 1858 @ViewDebug.ExportedProperty 1859 private float mScaleX = 1f; 1860 1861 /** 1862 * The amount of scale in the y direction around the pivot point. A 1863 * value of 1 means no scaling is applied. 1864 */ 1865 @ViewDebug.ExportedProperty 1866 private float mScaleY = 1f; 1867 1868 /** 1869 * The amount of scale in the x direction around the pivot point. A 1870 * value of 1 means no scaling is applied. 1871 */ 1872 @ViewDebug.ExportedProperty 1873 private float mPivotX = 0f; 1874 1875 /** 1876 * The amount of scale in the y direction around the pivot point. A 1877 * value of 1 means no scaling is applied. 1878 */ 1879 @ViewDebug.ExportedProperty 1880 private float mPivotY = 0f; 1881 1882 /** 1883 * The opacity of the View. This is a value from 0 to 1, where 0 means 1884 * completely transparent and 1 means completely opaque. 1885 */ 1886 @ViewDebug.ExportedProperty 1887 private float mAlpha = 1f; 1888 1889 /** 1890 * The distance in pixels from the left edge of this view's parent 1891 * to the left edge of this view. 1892 * {@hide} 1893 */ 1894 @ViewDebug.ExportedProperty(category = "layout") 1895 protected int mLeft; 1896 /** 1897 * The distance in pixels from the left edge of this view's parent 1898 * to the right edge of this view. 1899 * {@hide} 1900 */ 1901 @ViewDebug.ExportedProperty(category = "layout") 1902 protected int mRight; 1903 /** 1904 * The distance in pixels from the top edge of this view's parent 1905 * to the top edge of this view. 1906 * {@hide} 1907 */ 1908 @ViewDebug.ExportedProperty(category = "layout") 1909 protected int mTop; 1910 /** 1911 * The distance in pixels from the top edge of this view's parent 1912 * to the bottom edge of this view. 1913 * {@hide} 1914 */ 1915 @ViewDebug.ExportedProperty(category = "layout") 1916 protected int mBottom; 1917 1918 /** 1919 * The offset, in pixels, by which the content of this view is scrolled 1920 * horizontally. 1921 * {@hide} 1922 */ 1923 @ViewDebug.ExportedProperty(category = "scrolling") 1924 protected int mScrollX; 1925 /** 1926 * The offset, in pixels, by which the content of this view is scrolled 1927 * vertically. 1928 * {@hide} 1929 */ 1930 @ViewDebug.ExportedProperty(category = "scrolling") 1931 protected int mScrollY; 1932 1933 /** 1934 * The left padding in pixels, that is the distance in pixels between the 1935 * left edge of this view and the left edge of its content. 1936 * {@hide} 1937 */ 1938 @ViewDebug.ExportedProperty(category = "padding") 1939 protected int mPaddingLeft; 1940 /** 1941 * The right padding in pixels, that is the distance in pixels between the 1942 * right edge of this view and the right edge of its content. 1943 * {@hide} 1944 */ 1945 @ViewDebug.ExportedProperty(category = "padding") 1946 protected int mPaddingRight; 1947 /** 1948 * The top padding in pixels, that is the distance in pixels between the 1949 * top edge of this view and the top edge of its content. 1950 * {@hide} 1951 */ 1952 @ViewDebug.ExportedProperty(category = "padding") 1953 protected int mPaddingTop; 1954 /** 1955 * The bottom padding in pixels, that is the distance in pixels between the 1956 * bottom edge of this view and the bottom edge of its content. 1957 * {@hide} 1958 */ 1959 @ViewDebug.ExportedProperty(category = "padding") 1960 protected int mPaddingBottom; 1961 1962 /** 1963 * Briefly describes the view and is primarily used for accessibility support. 1964 */ 1965 private CharSequence mContentDescription; 1966 1967 /** 1968 * Cache the paddingRight set by the user to append to the scrollbar's size. 1969 */ 1970 @ViewDebug.ExportedProperty(category = "padding") 1971 int mUserPaddingRight; 1972 1973 /** 1974 * Cache the paddingBottom set by the user to append to the scrollbar's size. 1975 */ 1976 @ViewDebug.ExportedProperty(category = "padding") 1977 int mUserPaddingBottom; 1978 1979 /** 1980 * Cache the paddingLeft set by the user to append to the scrollbar's size. 1981 */ 1982 @ViewDebug.ExportedProperty(category = "padding") 1983 int mUserPaddingLeft; 1984 1985 /** 1986 * @hide 1987 */ 1988 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 1989 /** 1990 * @hide 1991 */ 1992 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 1993 1994 private Resources mResources = null; 1995 1996 private Drawable mBGDrawable; 1997 1998 private int mBackgroundResource; 1999 private boolean mBackgroundSizeChanged; 2000 2001 /** 2002 * Listener used to dispatch focus change events. 2003 * This field should be made private, so it is hidden from the SDK. 2004 * {@hide} 2005 */ 2006 protected OnFocusChangeListener mOnFocusChangeListener; 2007 2008 /** 2009 * Listeners for layout change events. 2010 */ 2011 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2012 2013 /** 2014 * Listener used to dispatch click events. 2015 * This field should be made private, so it is hidden from the SDK. 2016 * {@hide} 2017 */ 2018 protected OnClickListener mOnClickListener; 2019 2020 /** 2021 * Listener used to dispatch long click events. 2022 * This field should be made private, so it is hidden from the SDK. 2023 * {@hide} 2024 */ 2025 protected OnLongClickListener mOnLongClickListener; 2026 2027 /** 2028 * Listener used to build the context menu. 2029 * This field should be made private, so it is hidden from the SDK. 2030 * {@hide} 2031 */ 2032 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2033 2034 private OnKeyListener mOnKeyListener; 2035 2036 private OnTouchListener mOnTouchListener; 2037 2038 private OnDragListener mOnDragListener; 2039 2040 /** 2041 * The application environment this view lives in. 2042 * This field should be made private, so it is hidden from the SDK. 2043 * {@hide} 2044 */ 2045 protected Context mContext; 2046 2047 private ScrollabilityCache mScrollCache; 2048 2049 private int[] mDrawableState = null; 2050 2051 private Bitmap mDrawingCache; 2052 private Bitmap mUnscaledDrawingCache; 2053 private DisplayList mDisplayList; 2054 private HardwareLayer mHardwareLayer; 2055 2056 /** 2057 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2058 * the user may specify which view to go to next. 2059 */ 2060 private int mNextFocusLeftId = View.NO_ID; 2061 2062 /** 2063 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2064 * the user may specify which view to go to next. 2065 */ 2066 private int mNextFocusRightId = View.NO_ID; 2067 2068 /** 2069 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2070 * the user may specify which view to go to next. 2071 */ 2072 private int mNextFocusUpId = View.NO_ID; 2073 2074 /** 2075 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2076 * the user may specify which view to go to next. 2077 */ 2078 private int mNextFocusDownId = View.NO_ID; 2079 2080 /** 2081 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2082 * the user may specify which view to go to next. 2083 */ 2084 int mNextFocusForwardId = View.NO_ID; 2085 2086 private CheckForLongPress mPendingCheckForLongPress; 2087 private CheckForTap mPendingCheckForTap = null; 2088 private PerformClick mPerformClick; 2089 2090 private UnsetPressedState mUnsetPressedState; 2091 2092 /** 2093 * Whether the long press's action has been invoked. The tap's action is invoked on the 2094 * up event while a long press is invoked as soon as the long press duration is reached, so 2095 * a long press could be performed before the tap is checked, in which case the tap's action 2096 * should not be invoked. 2097 */ 2098 private boolean mHasPerformedLongPress; 2099 2100 /** 2101 * The minimum height of the view. We'll try our best to have the height 2102 * of this view to at least this amount. 2103 */ 2104 @ViewDebug.ExportedProperty(category = "measurement") 2105 private int mMinHeight; 2106 2107 /** 2108 * The minimum width of the view. We'll try our best to have the width 2109 * of this view to at least this amount. 2110 */ 2111 @ViewDebug.ExportedProperty(category = "measurement") 2112 private int mMinWidth; 2113 2114 /** 2115 * The delegate to handle touch events that are physically in this view 2116 * but should be handled by another view. 2117 */ 2118 private TouchDelegate mTouchDelegate = null; 2119 2120 /** 2121 * Solid color to use as a background when creating the drawing cache. Enables 2122 * the cache to use 16 bit bitmaps instead of 32 bit. 2123 */ 2124 private int mDrawingCacheBackgroundColor = 0; 2125 2126 /** 2127 * Special tree observer used when mAttachInfo is null. 2128 */ 2129 private ViewTreeObserver mFloatingTreeObserver; 2130 2131 /** 2132 * Cache the touch slop from the context that created the view. 2133 */ 2134 private int mTouchSlop; 2135 2136 /** 2137 * Cache drag/drop state 2138 * 2139 */ 2140 boolean mCanAcceptDrop; 2141 2142 /** 2143 * Flag indicating that a drag can cross window boundaries 2144 * @hide 2145 */ 2146 public static final int DRAG_FLAG_GLOBAL = 1; 2147 2148 /** 2149 * Position of the vertical scroll bar. 2150 */ 2151 private int mVerticalScrollbarPosition; 2152 2153 /** 2154 * Position the scroll bar at the default position as determined by the system. 2155 */ 2156 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2157 2158 /** 2159 * Position the scroll bar along the left edge. 2160 */ 2161 public static final int SCROLLBAR_POSITION_LEFT = 1; 2162 2163 /** 2164 * Position the scroll bar along the right edge. 2165 */ 2166 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2167 2168 /** 2169 * Indicates that the view does not have a layer. 2170 * 2171 * @see #getLayerType() 2172 * @see #setLayerType(int, android.graphics.Paint) 2173 * @see #LAYER_TYPE_SOFTWARE 2174 * @see #LAYER_TYPE_HARDWARE 2175 */ 2176 public static final int LAYER_TYPE_NONE = 0; 2177 2178 /** 2179 * <p>Indicates that the view has a software layer. A software layer is backed 2180 * by a bitmap and causes the view to be rendered using Android's software 2181 * rendering pipeline, even if hardware acceleration is enabled.</p> 2182 * 2183 * <p>Software layers have various usages:</p> 2184 * <p>When the application is not using hardware acceleration, a software layer 2185 * is useful to apply a specific color filter and/or blending mode and/or 2186 * translucency to a view and all its children.</p> 2187 * <p>When the application is using hardware acceleration, a software layer 2188 * is useful to render drawing primitives not supported by the hardware 2189 * accelerated pipeline. It can also be used to cache a complex view tree 2190 * into a texture and reduce the complexity of drawing operations. For instance, 2191 * when animating a complex view tree with a translation, a software layer can 2192 * be used to render the view tree only once.</p> 2193 * <p>Software layers should be avoided when the affected view tree updates 2194 * often. Every update will require to re-render the software layer, which can 2195 * potentially be slow (particularly when hardware acceleration is turned on 2196 * since the layer will have to be uploaded into a hardware texture after every 2197 * update.)</p> 2198 * 2199 * @see #getLayerType() 2200 * @see #setLayerType(int, android.graphics.Paint) 2201 * @see #LAYER_TYPE_NONE 2202 * @see #LAYER_TYPE_HARDWARE 2203 */ 2204 public static final int LAYER_TYPE_SOFTWARE = 1; 2205 2206 /** 2207 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2208 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2209 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2210 * rendering pipeline, but only if hardware acceleration is turned on for the 2211 * view hierarchy. When hardware acceleration is turned off, hardware layers 2212 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2213 * 2214 * <p>A hardware layer is useful to apply a specific color filter and/or 2215 * blending mode and/or translucency to a view and all its children.</p> 2216 * <p>A hardware layer can be used to cache a complex view tree into a 2217 * texture and reduce the complexity of drawing operations. For instance, 2218 * when animating a complex view tree with a translation, a hardware layer can 2219 * be used to render the view tree only once.</p> 2220 * <p>A hardware layer can also be used to increase the rendering quality when 2221 * rotation transformations are applied on a view. It can also be used to 2222 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2223 * 2224 * @see #getLayerType() 2225 * @see #setLayerType(int, android.graphics.Paint) 2226 * @see #LAYER_TYPE_NONE 2227 * @see #LAYER_TYPE_SOFTWARE 2228 */ 2229 public static final int LAYER_TYPE_HARDWARE = 2; 2230 2231 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2232 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2233 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2234 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2235 }) 2236 int mLayerType = LAYER_TYPE_NONE; 2237 Paint mLayerPaint; 2238 2239 /** 2240 * Simple constructor to use when creating a view from code. 2241 * 2242 * @param context The Context the view is running in, through which it can 2243 * access the current theme, resources, etc. 2244 */ 2245 public View(Context context) { 2246 mContext = context; 2247 mResources = context != null ? context.getResources() : null; 2248 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2249 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2250 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2251 } 2252 2253 /** 2254 * Constructor that is called when inflating a view from XML. This is called 2255 * when a view is being constructed from an XML file, supplying attributes 2256 * that were specified in the XML file. This version uses a default style of 2257 * 0, so the only attribute values applied are those in the Context's Theme 2258 * and the given AttributeSet. 2259 * 2260 * <p> 2261 * The method onFinishInflate() will be called after all children have been 2262 * added. 2263 * 2264 * @param context The Context the view is running in, through which it can 2265 * access the current theme, resources, etc. 2266 * @param attrs The attributes of the XML tag that is inflating the view. 2267 * @see #View(Context, AttributeSet, int) 2268 */ 2269 public View(Context context, AttributeSet attrs) { 2270 this(context, attrs, 0); 2271 } 2272 2273 /** 2274 * Perform inflation from XML and apply a class-specific base style. This 2275 * constructor of View allows subclasses to use their own base style when 2276 * they are inflating. For example, a Button class's constructor would call 2277 * this version of the super class constructor and supply 2278 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2279 * the theme's button style to modify all of the base view attributes (in 2280 * particular its background) as well as the Button class's attributes. 2281 * 2282 * @param context The Context the view is running in, through which it can 2283 * access the current theme, resources, etc. 2284 * @param attrs The attributes of the XML tag that is inflating the view. 2285 * @param defStyle The default style to apply to this view. If 0, no style 2286 * will be applied (beyond what is included in the theme). This may 2287 * either be an attribute resource, whose value will be retrieved 2288 * from the current theme, or an explicit style resource. 2289 * @see #View(Context, AttributeSet) 2290 */ 2291 public View(Context context, AttributeSet attrs, int defStyle) { 2292 this(context); 2293 2294 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2295 defStyle, 0); 2296 2297 Drawable background = null; 2298 2299 int leftPadding = -1; 2300 int topPadding = -1; 2301 int rightPadding = -1; 2302 int bottomPadding = -1; 2303 2304 int padding = -1; 2305 2306 int viewFlagValues = 0; 2307 int viewFlagMasks = 0; 2308 2309 boolean setScrollContainer = false; 2310 2311 int x = 0; 2312 int y = 0; 2313 2314 float tx = 0; 2315 float ty = 0; 2316 float rotation = 0; 2317 float rotationX = 0; 2318 float rotationY = 0; 2319 float sx = 1f; 2320 float sy = 1f; 2321 boolean transformSet = false; 2322 2323 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2324 2325 int overScrollMode = mOverScrollMode; 2326 final int N = a.getIndexCount(); 2327 for (int i = 0; i < N; i++) { 2328 int attr = a.getIndex(i); 2329 switch (attr) { 2330 case com.android.internal.R.styleable.View_background: 2331 background = a.getDrawable(attr); 2332 break; 2333 case com.android.internal.R.styleable.View_padding: 2334 padding = a.getDimensionPixelSize(attr, -1); 2335 break; 2336 case com.android.internal.R.styleable.View_paddingLeft: 2337 leftPadding = a.getDimensionPixelSize(attr, -1); 2338 break; 2339 case com.android.internal.R.styleable.View_paddingTop: 2340 topPadding = a.getDimensionPixelSize(attr, -1); 2341 break; 2342 case com.android.internal.R.styleable.View_paddingRight: 2343 rightPadding = a.getDimensionPixelSize(attr, -1); 2344 break; 2345 case com.android.internal.R.styleable.View_paddingBottom: 2346 bottomPadding = a.getDimensionPixelSize(attr, -1); 2347 break; 2348 case com.android.internal.R.styleable.View_scrollX: 2349 x = a.getDimensionPixelOffset(attr, 0); 2350 break; 2351 case com.android.internal.R.styleable.View_scrollY: 2352 y = a.getDimensionPixelOffset(attr, 0); 2353 break; 2354 case com.android.internal.R.styleable.View_alpha: 2355 setAlpha(a.getFloat(attr, 1f)); 2356 break; 2357 case com.android.internal.R.styleable.View_transformPivotX: 2358 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2359 break; 2360 case com.android.internal.R.styleable.View_transformPivotY: 2361 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2362 break; 2363 case com.android.internal.R.styleable.View_translationX: 2364 tx = a.getDimensionPixelOffset(attr, 0); 2365 transformSet = true; 2366 break; 2367 case com.android.internal.R.styleable.View_translationY: 2368 ty = a.getDimensionPixelOffset(attr, 0); 2369 transformSet = true; 2370 break; 2371 case com.android.internal.R.styleable.View_rotation: 2372 rotation = a.getFloat(attr, 0); 2373 transformSet = true; 2374 break; 2375 case com.android.internal.R.styleable.View_rotationX: 2376 rotationX = a.getFloat(attr, 0); 2377 transformSet = true; 2378 break; 2379 case com.android.internal.R.styleable.View_rotationY: 2380 rotationY = a.getFloat(attr, 0); 2381 transformSet = true; 2382 break; 2383 case com.android.internal.R.styleable.View_scaleX: 2384 sx = a.getFloat(attr, 1f); 2385 transformSet = true; 2386 break; 2387 case com.android.internal.R.styleable.View_scaleY: 2388 sy = a.getFloat(attr, 1f); 2389 transformSet = true; 2390 break; 2391 case com.android.internal.R.styleable.View_id: 2392 mID = a.getResourceId(attr, NO_ID); 2393 break; 2394 case com.android.internal.R.styleable.View_tag: 2395 mTag = a.getText(attr); 2396 break; 2397 case com.android.internal.R.styleable.View_fitsSystemWindows: 2398 if (a.getBoolean(attr, false)) { 2399 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2400 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2401 } 2402 break; 2403 case com.android.internal.R.styleable.View_focusable: 2404 if (a.getBoolean(attr, false)) { 2405 viewFlagValues |= FOCUSABLE; 2406 viewFlagMasks |= FOCUSABLE_MASK; 2407 } 2408 break; 2409 case com.android.internal.R.styleable.View_focusableInTouchMode: 2410 if (a.getBoolean(attr, false)) { 2411 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2412 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2413 } 2414 break; 2415 case com.android.internal.R.styleable.View_clickable: 2416 if (a.getBoolean(attr, false)) { 2417 viewFlagValues |= CLICKABLE; 2418 viewFlagMasks |= CLICKABLE; 2419 } 2420 break; 2421 case com.android.internal.R.styleable.View_longClickable: 2422 if (a.getBoolean(attr, false)) { 2423 viewFlagValues |= LONG_CLICKABLE; 2424 viewFlagMasks |= LONG_CLICKABLE; 2425 } 2426 break; 2427 case com.android.internal.R.styleable.View_saveEnabled: 2428 if (!a.getBoolean(attr, true)) { 2429 viewFlagValues |= SAVE_DISABLED; 2430 viewFlagMasks |= SAVE_DISABLED_MASK; 2431 } 2432 break; 2433 case com.android.internal.R.styleable.View_duplicateParentState: 2434 if (a.getBoolean(attr, false)) { 2435 viewFlagValues |= DUPLICATE_PARENT_STATE; 2436 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2437 } 2438 break; 2439 case com.android.internal.R.styleable.View_visibility: 2440 final int visibility = a.getInt(attr, 0); 2441 if (visibility != 0) { 2442 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2443 viewFlagMasks |= VISIBILITY_MASK; 2444 } 2445 break; 2446 case com.android.internal.R.styleable.View_drawingCacheQuality: 2447 final int cacheQuality = a.getInt(attr, 0); 2448 if (cacheQuality != 0) { 2449 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2450 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2451 } 2452 break; 2453 case com.android.internal.R.styleable.View_contentDescription: 2454 mContentDescription = a.getString(attr); 2455 break; 2456 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2457 if (!a.getBoolean(attr, true)) { 2458 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2459 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2460 } 2461 break; 2462 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2463 if (!a.getBoolean(attr, true)) { 2464 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2465 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2466 } 2467 break; 2468 case R.styleable.View_scrollbars: 2469 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2470 if (scrollbars != SCROLLBARS_NONE) { 2471 viewFlagValues |= scrollbars; 2472 viewFlagMasks |= SCROLLBARS_MASK; 2473 initializeScrollbars(a); 2474 } 2475 break; 2476 case R.styleable.View_fadingEdge: 2477 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2478 if (fadingEdge != FADING_EDGE_NONE) { 2479 viewFlagValues |= fadingEdge; 2480 viewFlagMasks |= FADING_EDGE_MASK; 2481 initializeFadingEdge(a); 2482 } 2483 break; 2484 case R.styleable.View_scrollbarStyle: 2485 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2486 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2487 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2488 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2489 } 2490 break; 2491 case R.styleable.View_isScrollContainer: 2492 setScrollContainer = true; 2493 if (a.getBoolean(attr, false)) { 2494 setScrollContainer(true); 2495 } 2496 break; 2497 case com.android.internal.R.styleable.View_keepScreenOn: 2498 if (a.getBoolean(attr, false)) { 2499 viewFlagValues |= KEEP_SCREEN_ON; 2500 viewFlagMasks |= KEEP_SCREEN_ON; 2501 } 2502 break; 2503 case R.styleable.View_filterTouchesWhenObscured: 2504 if (a.getBoolean(attr, false)) { 2505 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2506 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2507 } 2508 break; 2509 case R.styleable.View_nextFocusLeft: 2510 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2511 break; 2512 case R.styleable.View_nextFocusRight: 2513 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2514 break; 2515 case R.styleable.View_nextFocusUp: 2516 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2517 break; 2518 case R.styleable.View_nextFocusDown: 2519 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2520 break; 2521 case R.styleable.View_nextFocusForward: 2522 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2523 break; 2524 case R.styleable.View_minWidth: 2525 mMinWidth = a.getDimensionPixelSize(attr, 0); 2526 break; 2527 case R.styleable.View_minHeight: 2528 mMinHeight = a.getDimensionPixelSize(attr, 0); 2529 break; 2530 case R.styleable.View_onClick: 2531 if (context.isRestricted()) { 2532 throw new IllegalStateException("The android:onClick attribute cannot " 2533 + "be used within a restricted context"); 2534 } 2535 2536 final String handlerName = a.getString(attr); 2537 if (handlerName != null) { 2538 setOnClickListener(new OnClickListener() { 2539 private Method mHandler; 2540 2541 public void onClick(View v) { 2542 if (mHandler == null) { 2543 try { 2544 mHandler = getContext().getClass().getMethod(handlerName, 2545 View.class); 2546 } catch (NoSuchMethodException e) { 2547 int id = getId(); 2548 String idText = id == NO_ID ? "" : " with id '" 2549 + getContext().getResources().getResourceEntryName( 2550 id) + "'"; 2551 throw new IllegalStateException("Could not find a method " + 2552 handlerName + "(View) in the activity " 2553 + getContext().getClass() + " for onClick handler" 2554 + " on view " + View.this.getClass() + idText, e); 2555 } 2556 } 2557 2558 try { 2559 mHandler.invoke(getContext(), View.this); 2560 } catch (IllegalAccessException e) { 2561 throw new IllegalStateException("Could not execute non " 2562 + "public method of the activity", e); 2563 } catch (InvocationTargetException e) { 2564 throw new IllegalStateException("Could not execute " 2565 + "method of the activity", e); 2566 } 2567 } 2568 }); 2569 } 2570 break; 2571 case R.styleable.View_overScrollMode: 2572 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2573 break; 2574 case R.styleable.View_verticalScrollbarPosition: 2575 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2576 break; 2577 case R.styleable.View_layerType: 2578 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2579 break; 2580 } 2581 } 2582 2583 setOverScrollMode(overScrollMode); 2584 2585 if (background != null) { 2586 setBackgroundDrawable(background); 2587 } 2588 2589 if (padding >= 0) { 2590 leftPadding = padding; 2591 topPadding = padding; 2592 rightPadding = padding; 2593 bottomPadding = padding; 2594 } 2595 2596 // If the user specified the padding (either with android:padding or 2597 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2598 // use the default padding or the padding from the background drawable 2599 // (stored at this point in mPadding*) 2600 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2601 topPadding >= 0 ? topPadding : mPaddingTop, 2602 rightPadding >= 0 ? rightPadding : mPaddingRight, 2603 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2604 2605 if (viewFlagMasks != 0) { 2606 setFlags(viewFlagValues, viewFlagMasks); 2607 } 2608 2609 // Needs to be called after mViewFlags is set 2610 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2611 recomputePadding(); 2612 } 2613 2614 if (x != 0 || y != 0) { 2615 scrollTo(x, y); 2616 } 2617 2618 if (transformSet) { 2619 setTranslationX(tx); 2620 setTranslationY(ty); 2621 setRotation(rotation); 2622 setRotationX(rotationX); 2623 setRotationY(rotationY); 2624 setScaleX(sx); 2625 setScaleY(sy); 2626 } 2627 2628 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2629 setScrollContainer(true); 2630 } 2631 2632 computeOpaqueFlags(); 2633 2634 a.recycle(); 2635 } 2636 2637 /** 2638 * Non-public constructor for use in testing 2639 */ 2640 View() { 2641 } 2642 2643 /** 2644 * <p> 2645 * Initializes the fading edges from a given set of styled attributes. This 2646 * method should be called by subclasses that need fading edges and when an 2647 * instance of these subclasses is created programmatically rather than 2648 * being inflated from XML. This method is automatically called when the XML 2649 * is inflated. 2650 * </p> 2651 * 2652 * @param a the styled attributes set to initialize the fading edges from 2653 */ 2654 protected void initializeFadingEdge(TypedArray a) { 2655 initScrollCache(); 2656 2657 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2658 R.styleable.View_fadingEdgeLength, 2659 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2660 } 2661 2662 /** 2663 * Returns the size of the vertical faded edges used to indicate that more 2664 * content in this view is visible. 2665 * 2666 * @return The size in pixels of the vertical faded edge or 0 if vertical 2667 * faded edges are not enabled for this view. 2668 * @attr ref android.R.styleable#View_fadingEdgeLength 2669 */ 2670 public int getVerticalFadingEdgeLength() { 2671 if (isVerticalFadingEdgeEnabled()) { 2672 ScrollabilityCache cache = mScrollCache; 2673 if (cache != null) { 2674 return cache.fadingEdgeLength; 2675 } 2676 } 2677 return 0; 2678 } 2679 2680 /** 2681 * Set the size of the faded edge used to indicate that more content in this 2682 * view is available. Will not change whether the fading edge is enabled; use 2683 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2684 * to enable the fading edge for the vertical or horizontal fading edges. 2685 * 2686 * @param length The size in pixels of the faded edge used to indicate that more 2687 * content in this view is visible. 2688 */ 2689 public void setFadingEdgeLength(int length) { 2690 initScrollCache(); 2691 mScrollCache.fadingEdgeLength = length; 2692 } 2693 2694 /** 2695 * Returns the size of the horizontal faded edges used to indicate that more 2696 * content in this view is visible. 2697 * 2698 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2699 * faded edges are not enabled for this view. 2700 * @attr ref android.R.styleable#View_fadingEdgeLength 2701 */ 2702 public int getHorizontalFadingEdgeLength() { 2703 if (isHorizontalFadingEdgeEnabled()) { 2704 ScrollabilityCache cache = mScrollCache; 2705 if (cache != null) { 2706 return cache.fadingEdgeLength; 2707 } 2708 } 2709 return 0; 2710 } 2711 2712 /** 2713 * Returns the width of the vertical scrollbar. 2714 * 2715 * @return The width in pixels of the vertical scrollbar or 0 if there 2716 * is no vertical scrollbar. 2717 */ 2718 public int getVerticalScrollbarWidth() { 2719 ScrollabilityCache cache = mScrollCache; 2720 if (cache != null) { 2721 ScrollBarDrawable scrollBar = cache.scrollBar; 2722 if (scrollBar != null) { 2723 int size = scrollBar.getSize(true); 2724 if (size <= 0) { 2725 size = cache.scrollBarSize; 2726 } 2727 return size; 2728 } 2729 return 0; 2730 } 2731 return 0; 2732 } 2733 2734 /** 2735 * Returns the height of the horizontal scrollbar. 2736 * 2737 * @return The height in pixels of the horizontal scrollbar or 0 if 2738 * there is no horizontal scrollbar. 2739 */ 2740 protected int getHorizontalScrollbarHeight() { 2741 ScrollabilityCache cache = mScrollCache; 2742 if (cache != null) { 2743 ScrollBarDrawable scrollBar = cache.scrollBar; 2744 if (scrollBar != null) { 2745 int size = scrollBar.getSize(false); 2746 if (size <= 0) { 2747 size = cache.scrollBarSize; 2748 } 2749 return size; 2750 } 2751 return 0; 2752 } 2753 return 0; 2754 } 2755 2756 /** 2757 * <p> 2758 * Initializes the scrollbars from a given set of styled attributes. This 2759 * method should be called by subclasses that need scrollbars and when an 2760 * instance of these subclasses is created programmatically rather than 2761 * being inflated from XML. This method is automatically called when the XML 2762 * is inflated. 2763 * </p> 2764 * 2765 * @param a the styled attributes set to initialize the scrollbars from 2766 */ 2767 protected void initializeScrollbars(TypedArray a) { 2768 initScrollCache(); 2769 2770 final ScrollabilityCache scrollabilityCache = mScrollCache; 2771 2772 if (scrollabilityCache.scrollBar == null) { 2773 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2774 } 2775 2776 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2777 2778 if (!fadeScrollbars) { 2779 scrollabilityCache.state = ScrollabilityCache.ON; 2780 } 2781 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2782 2783 2784 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2785 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2786 .getScrollBarFadeDuration()); 2787 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2788 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2789 ViewConfiguration.getScrollDefaultDelay()); 2790 2791 2792 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2793 com.android.internal.R.styleable.View_scrollbarSize, 2794 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2795 2796 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2797 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2798 2799 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2800 if (thumb != null) { 2801 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2802 } 2803 2804 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2805 false); 2806 if (alwaysDraw) { 2807 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2808 } 2809 2810 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2811 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2812 2813 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2814 if (thumb != null) { 2815 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2816 } 2817 2818 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2819 false); 2820 if (alwaysDraw) { 2821 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2822 } 2823 2824 // Re-apply user/background padding so that scrollbar(s) get added 2825 recomputePadding(); 2826 } 2827 2828 /** 2829 * <p> 2830 * Initalizes the scrollability cache if necessary. 2831 * </p> 2832 */ 2833 private void initScrollCache() { 2834 if (mScrollCache == null) { 2835 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2836 } 2837 } 2838 2839 /** 2840 * Set the position of the vertical scroll bar. Should be one of 2841 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 2842 * {@link #SCROLLBAR_POSITION_RIGHT}. 2843 * 2844 * @param position Where the vertical scroll bar should be positioned. 2845 */ 2846 public void setVerticalScrollbarPosition(int position) { 2847 if (mVerticalScrollbarPosition != position) { 2848 mVerticalScrollbarPosition = position; 2849 computeOpaqueFlags(); 2850 recomputePadding(); 2851 } 2852 } 2853 2854 /** 2855 * @return The position where the vertical scroll bar will show, if applicable. 2856 * @see #setVerticalScrollbarPosition(int) 2857 */ 2858 public int getVerticalScrollbarPosition() { 2859 return mVerticalScrollbarPosition; 2860 } 2861 2862 /** 2863 * Register a callback to be invoked when focus of this view changed. 2864 * 2865 * @param l The callback that will run. 2866 */ 2867 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2868 mOnFocusChangeListener = l; 2869 } 2870 2871 /** 2872 * Add a listener that will be called when the bounds of the view change due to 2873 * layout processing. 2874 * 2875 * @param listener The listener that will be called when layout bounds change. 2876 */ 2877 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 2878 if (mOnLayoutChangeListeners == null) { 2879 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 2880 } 2881 mOnLayoutChangeListeners.add(listener); 2882 } 2883 2884 /** 2885 * Remove a listener for layout changes. 2886 * 2887 * @param listener The listener for layout bounds change. 2888 */ 2889 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 2890 if (mOnLayoutChangeListeners == null) { 2891 return; 2892 } 2893 mOnLayoutChangeListeners.remove(listener); 2894 } 2895 2896 /** 2897 * Gets the current list of listeners for layout changes. 2898 */ 2899 public List<OnLayoutChangeListener> getOnLayoutChangeListeners() { 2900 return mOnLayoutChangeListeners; 2901 } 2902 2903 /** 2904 * Returns the focus-change callback registered for this view. 2905 * 2906 * @return The callback, or null if one is not registered. 2907 */ 2908 public OnFocusChangeListener getOnFocusChangeListener() { 2909 return mOnFocusChangeListener; 2910 } 2911 2912 /** 2913 * Register a callback to be invoked when this view is clicked. If this view is not 2914 * clickable, it becomes clickable. 2915 * 2916 * @param l The callback that will run 2917 * 2918 * @see #setClickable(boolean) 2919 */ 2920 public void setOnClickListener(OnClickListener l) { 2921 if (!isClickable()) { 2922 setClickable(true); 2923 } 2924 mOnClickListener = l; 2925 } 2926 2927 /** 2928 * Register a callback to be invoked when this view is clicked and held. If this view is not 2929 * long clickable, it becomes long clickable. 2930 * 2931 * @param l The callback that will run 2932 * 2933 * @see #setLongClickable(boolean) 2934 */ 2935 public void setOnLongClickListener(OnLongClickListener l) { 2936 if (!isLongClickable()) { 2937 setLongClickable(true); 2938 } 2939 mOnLongClickListener = l; 2940 } 2941 2942 /** 2943 * Register a callback to be invoked when the context menu for this view is 2944 * being built. If this view is not long clickable, it becomes long clickable. 2945 * 2946 * @param l The callback that will run 2947 * 2948 */ 2949 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 2950 if (!isLongClickable()) { 2951 setLongClickable(true); 2952 } 2953 mOnCreateContextMenuListener = l; 2954 } 2955 2956 /** 2957 * Call this view's OnClickListener, if it is defined. 2958 * 2959 * @return True there was an assigned OnClickListener that was called, false 2960 * otherwise is returned. 2961 */ 2962 public boolean performClick() { 2963 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 2964 2965 if (mOnClickListener != null) { 2966 playSoundEffect(SoundEffectConstants.CLICK); 2967 mOnClickListener.onClick(this); 2968 return true; 2969 } 2970 2971 return false; 2972 } 2973 2974 /** 2975 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 2976 * OnLongClickListener did not consume the event. 2977 * 2978 * @return True if one of the above receivers consumed the event, false otherwise. 2979 */ 2980 public boolean performLongClick() { 2981 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 2982 2983 boolean handled = false; 2984 if (mOnLongClickListener != null) { 2985 handled = mOnLongClickListener.onLongClick(View.this); 2986 } 2987 if (!handled) { 2988 handled = showContextMenu(); 2989 } 2990 if (handled) { 2991 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 2992 } 2993 return handled; 2994 } 2995 2996 /** 2997 * Bring up the context menu for this view. 2998 * 2999 * @return Whether a context menu was displayed. 3000 */ 3001 public boolean showContextMenu() { 3002 return getParent().showContextMenuForChild(this); 3003 } 3004 3005 /** 3006 * Start an action mode. 3007 * 3008 * @param callback Callback that will control the lifecycle of the action mode 3009 * @return The new action mode if it is started, null otherwise 3010 * 3011 * @see ActionMode 3012 */ 3013 public ActionMode startActionMode(ActionMode.Callback callback) { 3014 return getParent().startActionModeForChild(this, callback); 3015 } 3016 3017 /** 3018 * Register a callback to be invoked when a key is pressed in this view. 3019 * @param l the key listener to attach to this view 3020 */ 3021 public void setOnKeyListener(OnKeyListener l) { 3022 mOnKeyListener = l; 3023 } 3024 3025 /** 3026 * Register a callback to be invoked when a touch event is sent to this view. 3027 * @param l the touch listener to attach to this view 3028 */ 3029 public void setOnTouchListener(OnTouchListener l) { 3030 mOnTouchListener = l; 3031 } 3032 3033 /** 3034 * Register a callback to be invoked when a drag event is sent to this view. 3035 * @param l The drag listener to attach to this view 3036 */ 3037 public void setOnDragListener(OnDragListener l) { 3038 mOnDragListener = l; 3039 } 3040 3041 /** 3042 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 3043 * 3044 * Note: this does not check whether this {@link View} should get focus, it just 3045 * gives it focus no matter what. It should only be called internally by framework 3046 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3047 * 3048 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 3049 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 3050 * focus moved when requestFocus() is called. It may not always 3051 * apply, in which case use the default View.FOCUS_DOWN. 3052 * @param previouslyFocusedRect The rectangle of the view that had focus 3053 * prior in this View's coordinate system. 3054 */ 3055 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3056 if (DBG) { 3057 System.out.println(this + " requestFocus()"); 3058 } 3059 3060 if ((mPrivateFlags & FOCUSED) == 0) { 3061 mPrivateFlags |= FOCUSED; 3062 3063 if (mParent != null) { 3064 mParent.requestChildFocus(this, this); 3065 } 3066 3067 onFocusChanged(true, direction, previouslyFocusedRect); 3068 refreshDrawableState(); 3069 } 3070 } 3071 3072 /** 3073 * Request that a rectangle of this view be visible on the screen, 3074 * scrolling if necessary just enough. 3075 * 3076 * <p>A View should call this if it maintains some notion of which part 3077 * of its content is interesting. For example, a text editing view 3078 * should call this when its cursor moves. 3079 * 3080 * @param rectangle The rectangle. 3081 * @return Whether any parent scrolled. 3082 */ 3083 public boolean requestRectangleOnScreen(Rect rectangle) { 3084 return requestRectangleOnScreen(rectangle, false); 3085 } 3086 3087 /** 3088 * Request that a rectangle of this view be visible on the screen, 3089 * scrolling if necessary just enough. 3090 * 3091 * <p>A View should call this if it maintains some notion of which part 3092 * of its content is interesting. For example, a text editing view 3093 * should call this when its cursor moves. 3094 * 3095 * <p>When <code>immediate</code> is set to true, scrolling will not be 3096 * animated. 3097 * 3098 * @param rectangle The rectangle. 3099 * @param immediate True to forbid animated scrolling, false otherwise 3100 * @return Whether any parent scrolled. 3101 */ 3102 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3103 View child = this; 3104 ViewParent parent = mParent; 3105 boolean scrolled = false; 3106 while (parent != null) { 3107 scrolled |= parent.requestChildRectangleOnScreen(child, 3108 rectangle, immediate); 3109 3110 // offset rect so next call has the rectangle in the 3111 // coordinate system of its direct child. 3112 rectangle.offset(child.getLeft(), child.getTop()); 3113 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3114 3115 if (!(parent instanceof View)) { 3116 break; 3117 } 3118 3119 child = (View) parent; 3120 parent = child.getParent(); 3121 } 3122 return scrolled; 3123 } 3124 3125 /** 3126 * Called when this view wants to give up focus. This will cause 3127 * {@link #onFocusChanged} to be called. 3128 */ 3129 public void clearFocus() { 3130 if (DBG) { 3131 System.out.println(this + " clearFocus()"); 3132 } 3133 3134 if ((mPrivateFlags & FOCUSED) != 0) { 3135 mPrivateFlags &= ~FOCUSED; 3136 3137 if (mParent != null) { 3138 mParent.clearChildFocus(this); 3139 } 3140 3141 onFocusChanged(false, 0, null); 3142 refreshDrawableState(); 3143 } 3144 } 3145 3146 /** 3147 * Called to clear the focus of a view that is about to be removed. 3148 * Doesn't call clearChildFocus, which prevents this view from taking 3149 * focus again before it has been removed from the parent 3150 */ 3151 void clearFocusForRemoval() { 3152 if ((mPrivateFlags & FOCUSED) != 0) { 3153 mPrivateFlags &= ~FOCUSED; 3154 3155 onFocusChanged(false, 0, null); 3156 refreshDrawableState(); 3157 } 3158 } 3159 3160 /** 3161 * Called internally by the view system when a new view is getting focus. 3162 * This is what clears the old focus. 3163 */ 3164 void unFocus() { 3165 if (DBG) { 3166 System.out.println(this + " unFocus()"); 3167 } 3168 3169 if ((mPrivateFlags & FOCUSED) != 0) { 3170 mPrivateFlags &= ~FOCUSED; 3171 3172 onFocusChanged(false, 0, null); 3173 refreshDrawableState(); 3174 } 3175 } 3176 3177 /** 3178 * Returns true if this view has focus iteself, or is the ancestor of the 3179 * view that has focus. 3180 * 3181 * @return True if this view has or contains focus, false otherwise. 3182 */ 3183 @ViewDebug.ExportedProperty(category = "focus") 3184 public boolean hasFocus() { 3185 return (mPrivateFlags & FOCUSED) != 0; 3186 } 3187 3188 /** 3189 * Returns true if this view is focusable or if it contains a reachable View 3190 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3191 * is a View whose parents do not block descendants focus. 3192 * 3193 * Only {@link #VISIBLE} views are considered focusable. 3194 * 3195 * @return True if the view is focusable or if the view contains a focusable 3196 * View, false otherwise. 3197 * 3198 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3199 */ 3200 public boolean hasFocusable() { 3201 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3202 } 3203 3204 /** 3205 * Called by the view system when the focus state of this view changes. 3206 * When the focus change event is caused by directional navigation, direction 3207 * and previouslyFocusedRect provide insight into where the focus is coming from. 3208 * When overriding, be sure to call up through to the super class so that 3209 * the standard focus handling will occur. 3210 * 3211 * @param gainFocus True if the View has focus; false otherwise. 3212 * @param direction The direction focus has moved when requestFocus() 3213 * is called to give this view focus. Values are 3214 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3215 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3216 * It may not always apply, in which case use the default. 3217 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3218 * system, of the previously focused view. If applicable, this will be 3219 * passed in as finer grained information about where the focus is coming 3220 * from (in addition to direction). Will be <code>null</code> otherwise. 3221 */ 3222 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3223 if (gainFocus) { 3224 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3225 } 3226 3227 InputMethodManager imm = InputMethodManager.peekInstance(); 3228 if (!gainFocus) { 3229 if (isPressed()) { 3230 setPressed(false); 3231 } 3232 if (imm != null && mAttachInfo != null 3233 && mAttachInfo.mHasWindowFocus) { 3234 imm.focusOut(this); 3235 } 3236 onFocusLost(); 3237 } else if (imm != null && mAttachInfo != null 3238 && mAttachInfo.mHasWindowFocus) { 3239 imm.focusIn(this); 3240 } 3241 3242 invalidate(); 3243 if (mOnFocusChangeListener != null) { 3244 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3245 } 3246 3247 if (mAttachInfo != null) { 3248 mAttachInfo.mKeyDispatchState.reset(this); 3249 } 3250 } 3251 3252 /** 3253 * {@inheritDoc} 3254 */ 3255 public void sendAccessibilityEvent(int eventType) { 3256 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3257 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3258 } 3259 } 3260 3261 /** 3262 * {@inheritDoc} 3263 */ 3264 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3265 if (!isShown()) { 3266 return; 3267 } 3268 event.setClassName(getClass().getName()); 3269 event.setPackageName(getContext().getPackageName()); 3270 event.setEnabled(isEnabled()); 3271 event.setContentDescription(mContentDescription); 3272 3273 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3274 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3275 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3276 event.setItemCount(focusablesTempList.size()); 3277 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3278 focusablesTempList.clear(); 3279 } 3280 3281 dispatchPopulateAccessibilityEvent(event); 3282 3283 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 3284 } 3285 3286 /** 3287 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 3288 * to be populated. 3289 * 3290 * @param event The event. 3291 * 3292 * @return True if the event population was completed. 3293 */ 3294 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3295 return false; 3296 } 3297 3298 /** 3299 * Gets the {@link View} description. It briefly describes the view and is 3300 * primarily used for accessibility support. Set this property to enable 3301 * better accessibility support for your application. This is especially 3302 * true for views that do not have textual representation (For example, 3303 * ImageButton). 3304 * 3305 * @return The content descriptiopn. 3306 * 3307 * @attr ref android.R.styleable#View_contentDescription 3308 */ 3309 public CharSequence getContentDescription() { 3310 return mContentDescription; 3311 } 3312 3313 /** 3314 * Sets the {@link View} description. It briefly describes the view and is 3315 * primarily used for accessibility support. Set this property to enable 3316 * better accessibility support for your application. This is especially 3317 * true for views that do not have textual representation (For example, 3318 * ImageButton). 3319 * 3320 * @param contentDescription The content description. 3321 * 3322 * @attr ref android.R.styleable#View_contentDescription 3323 */ 3324 public void setContentDescription(CharSequence contentDescription) { 3325 mContentDescription = contentDescription; 3326 } 3327 3328 /** 3329 * Invoked whenever this view loses focus, either by losing window focus or by losing 3330 * focus within its window. This method can be used to clear any state tied to the 3331 * focus. For instance, if a button is held pressed with the trackball and the window 3332 * loses focus, this method can be used to cancel the press. 3333 * 3334 * Subclasses of View overriding this method should always call super.onFocusLost(). 3335 * 3336 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3337 * @see #onWindowFocusChanged(boolean) 3338 * 3339 * @hide pending API council approval 3340 */ 3341 protected void onFocusLost() { 3342 resetPressedState(); 3343 } 3344 3345 private void resetPressedState() { 3346 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3347 return; 3348 } 3349 3350 if (isPressed()) { 3351 setPressed(false); 3352 3353 if (!mHasPerformedLongPress) { 3354 removeLongPressCallback(); 3355 } 3356 } 3357 } 3358 3359 /** 3360 * Returns true if this view has focus 3361 * 3362 * @return True if this view has focus, false otherwise. 3363 */ 3364 @ViewDebug.ExportedProperty(category = "focus") 3365 public boolean isFocused() { 3366 return (mPrivateFlags & FOCUSED) != 0; 3367 } 3368 3369 /** 3370 * Find the view in the hierarchy rooted at this view that currently has 3371 * focus. 3372 * 3373 * @return The view that currently has focus, or null if no focused view can 3374 * be found. 3375 */ 3376 public View findFocus() { 3377 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3378 } 3379 3380 /** 3381 * Change whether this view is one of the set of scrollable containers in 3382 * its window. This will be used to determine whether the window can 3383 * resize or must pan when a soft input area is open -- scrollable 3384 * containers allow the window to use resize mode since the container 3385 * will appropriately shrink. 3386 */ 3387 public void setScrollContainer(boolean isScrollContainer) { 3388 if (isScrollContainer) { 3389 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3390 mAttachInfo.mScrollContainers.add(this); 3391 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3392 } 3393 mPrivateFlags |= SCROLL_CONTAINER; 3394 } else { 3395 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3396 mAttachInfo.mScrollContainers.remove(this); 3397 } 3398 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3399 } 3400 } 3401 3402 /** 3403 * Returns the quality of the drawing cache. 3404 * 3405 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3406 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3407 * 3408 * @see #setDrawingCacheQuality(int) 3409 * @see #setDrawingCacheEnabled(boolean) 3410 * @see #isDrawingCacheEnabled() 3411 * 3412 * @attr ref android.R.styleable#View_drawingCacheQuality 3413 */ 3414 public int getDrawingCacheQuality() { 3415 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3416 } 3417 3418 /** 3419 * Set the drawing cache quality of this view. This value is used only when the 3420 * drawing cache is enabled 3421 * 3422 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3423 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3424 * 3425 * @see #getDrawingCacheQuality() 3426 * @see #setDrawingCacheEnabled(boolean) 3427 * @see #isDrawingCacheEnabled() 3428 * 3429 * @attr ref android.R.styleable#View_drawingCacheQuality 3430 */ 3431 public void setDrawingCacheQuality(int quality) { 3432 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3433 } 3434 3435 /** 3436 * Returns whether the screen should remain on, corresponding to the current 3437 * value of {@link #KEEP_SCREEN_ON}. 3438 * 3439 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3440 * 3441 * @see #setKeepScreenOn(boolean) 3442 * 3443 * @attr ref android.R.styleable#View_keepScreenOn 3444 */ 3445 public boolean getKeepScreenOn() { 3446 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3447 } 3448 3449 /** 3450 * Controls whether the screen should remain on, modifying the 3451 * value of {@link #KEEP_SCREEN_ON}. 3452 * 3453 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3454 * 3455 * @see #getKeepScreenOn() 3456 * 3457 * @attr ref android.R.styleable#View_keepScreenOn 3458 */ 3459 public void setKeepScreenOn(boolean keepScreenOn) { 3460 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3461 } 3462 3463 /** 3464 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3465 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3466 * 3467 * @attr ref android.R.styleable#View_nextFocusLeft 3468 */ 3469 public int getNextFocusLeftId() { 3470 return mNextFocusLeftId; 3471 } 3472 3473 /** 3474 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3475 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3476 * decide automatically. 3477 * 3478 * @attr ref android.R.styleable#View_nextFocusLeft 3479 */ 3480 public void setNextFocusLeftId(int nextFocusLeftId) { 3481 mNextFocusLeftId = nextFocusLeftId; 3482 } 3483 3484 /** 3485 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3486 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3487 * 3488 * @attr ref android.R.styleable#View_nextFocusRight 3489 */ 3490 public int getNextFocusRightId() { 3491 return mNextFocusRightId; 3492 } 3493 3494 /** 3495 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3496 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3497 * decide automatically. 3498 * 3499 * @attr ref android.R.styleable#View_nextFocusRight 3500 */ 3501 public void setNextFocusRightId(int nextFocusRightId) { 3502 mNextFocusRightId = nextFocusRightId; 3503 } 3504 3505 /** 3506 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3507 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3508 * 3509 * @attr ref android.R.styleable#View_nextFocusUp 3510 */ 3511 public int getNextFocusUpId() { 3512 return mNextFocusUpId; 3513 } 3514 3515 /** 3516 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3517 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 3518 * decide automatically. 3519 * 3520 * @attr ref android.R.styleable#View_nextFocusUp 3521 */ 3522 public void setNextFocusUpId(int nextFocusUpId) { 3523 mNextFocusUpId = nextFocusUpId; 3524 } 3525 3526 /** 3527 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3528 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3529 * 3530 * @attr ref android.R.styleable#View_nextFocusDown 3531 */ 3532 public int getNextFocusDownId() { 3533 return mNextFocusDownId; 3534 } 3535 3536 /** 3537 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3538 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 3539 * decide automatically. 3540 * 3541 * @attr ref android.R.styleable#View_nextFocusDown 3542 */ 3543 public void setNextFocusDownId(int nextFocusDownId) { 3544 mNextFocusDownId = nextFocusDownId; 3545 } 3546 3547 /** 3548 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3549 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3550 * 3551 * @attr ref android.R.styleable#View_nextFocusForward 3552 */ 3553 public int getNextFocusForwardId() { 3554 return mNextFocusForwardId; 3555 } 3556 3557 /** 3558 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3559 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 3560 * decide automatically. 3561 * 3562 * @attr ref android.R.styleable#View_nextFocusForward 3563 */ 3564 public void setNextFocusForwardId(int nextFocusForwardId) { 3565 mNextFocusForwardId = nextFocusForwardId; 3566 } 3567 3568 /** 3569 * Returns the visibility of this view and all of its ancestors 3570 * 3571 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3572 */ 3573 public boolean isShown() { 3574 View current = this; 3575 //noinspection ConstantConditions 3576 do { 3577 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3578 return false; 3579 } 3580 ViewParent parent = current.mParent; 3581 if (parent == null) { 3582 return false; // We are not attached to the view root 3583 } 3584 if (!(parent instanceof View)) { 3585 return true; 3586 } 3587 current = (View) parent; 3588 } while (current != null); 3589 3590 return false; 3591 } 3592 3593 /** 3594 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3595 * is set 3596 * 3597 * @param insets Insets for system windows 3598 * 3599 * @return True if this view applied the insets, false otherwise 3600 */ 3601 protected boolean fitSystemWindows(Rect insets) { 3602 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3603 mPaddingLeft = insets.left; 3604 mPaddingTop = insets.top; 3605 mPaddingRight = insets.right; 3606 mPaddingBottom = insets.bottom; 3607 requestLayout(); 3608 return true; 3609 } 3610 return false; 3611 } 3612 3613 /** 3614 * Determine if this view has the FITS_SYSTEM_WINDOWS flag set. 3615 * @return True if window has FITS_SYSTEM_WINDOWS set 3616 * 3617 * @hide 3618 */ 3619 public boolean isFitsSystemWindowsFlagSet() { 3620 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 3621 } 3622 3623 /** 3624 * Returns the visibility status for this view. 3625 * 3626 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3627 * @attr ref android.R.styleable#View_visibility 3628 */ 3629 @ViewDebug.ExportedProperty(mapping = { 3630 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3631 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3632 @ViewDebug.IntToString(from = GONE, to = "GONE") 3633 }) 3634 public int getVisibility() { 3635 return mViewFlags & VISIBILITY_MASK; 3636 } 3637 3638 /** 3639 * Set the enabled state of this view. 3640 * 3641 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3642 * @attr ref android.R.styleable#View_visibility 3643 */ 3644 @RemotableViewMethod 3645 public void setVisibility(int visibility) { 3646 setFlags(visibility, VISIBILITY_MASK); 3647 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3648 } 3649 3650 /** 3651 * Returns the enabled status for this view. The interpretation of the 3652 * enabled state varies by subclass. 3653 * 3654 * @return True if this view is enabled, false otherwise. 3655 */ 3656 @ViewDebug.ExportedProperty 3657 public boolean isEnabled() { 3658 return (mViewFlags & ENABLED_MASK) == ENABLED; 3659 } 3660 3661 /** 3662 * Set the enabled state of this view. The interpretation of the enabled 3663 * state varies by subclass. 3664 * 3665 * @param enabled True if this view is enabled, false otherwise. 3666 */ 3667 @RemotableViewMethod 3668 public void setEnabled(boolean enabled) { 3669 if (enabled == isEnabled()) return; 3670 3671 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3672 3673 /* 3674 * The View most likely has to change its appearance, so refresh 3675 * the drawable state. 3676 */ 3677 refreshDrawableState(); 3678 3679 // Invalidate too, since the default behavior for views is to be 3680 // be drawn at 50% alpha rather than to change the drawable. 3681 invalidate(); 3682 } 3683 3684 /** 3685 * Set whether this view can receive the focus. 3686 * 3687 * Setting this to false will also ensure that this view is not focusable 3688 * in touch mode. 3689 * 3690 * @param focusable If true, this view can receive the focus. 3691 * 3692 * @see #setFocusableInTouchMode(boolean) 3693 * @attr ref android.R.styleable#View_focusable 3694 */ 3695 public void setFocusable(boolean focusable) { 3696 if (!focusable) { 3697 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3698 } 3699 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3700 } 3701 3702 /** 3703 * Set whether this view can receive focus while in touch mode. 3704 * 3705 * Setting this to true will also ensure that this view is focusable. 3706 * 3707 * @param focusableInTouchMode If true, this view can receive the focus while 3708 * in touch mode. 3709 * 3710 * @see #setFocusable(boolean) 3711 * @attr ref android.R.styleable#View_focusableInTouchMode 3712 */ 3713 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3714 // Focusable in touch mode should always be set before the focusable flag 3715 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3716 // which, in touch mode, will not successfully request focus on this view 3717 // because the focusable in touch mode flag is not set 3718 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3719 if (focusableInTouchMode) { 3720 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3721 } 3722 } 3723 3724 /** 3725 * Set whether this view should have sound effects enabled for events such as 3726 * clicking and touching. 3727 * 3728 * <p>You may wish to disable sound effects for a view if you already play sounds, 3729 * for instance, a dial key that plays dtmf tones. 3730 * 3731 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3732 * @see #isSoundEffectsEnabled() 3733 * @see #playSoundEffect(int) 3734 * @attr ref android.R.styleable#View_soundEffectsEnabled 3735 */ 3736 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3737 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3738 } 3739 3740 /** 3741 * @return whether this view should have sound effects enabled for events such as 3742 * clicking and touching. 3743 * 3744 * @see #setSoundEffectsEnabled(boolean) 3745 * @see #playSoundEffect(int) 3746 * @attr ref android.R.styleable#View_soundEffectsEnabled 3747 */ 3748 @ViewDebug.ExportedProperty 3749 public boolean isSoundEffectsEnabled() { 3750 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3751 } 3752 3753 /** 3754 * Set whether this view should have haptic feedback for events such as 3755 * long presses. 3756 * 3757 * <p>You may wish to disable haptic feedback if your view already controls 3758 * its own haptic feedback. 3759 * 3760 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3761 * @see #isHapticFeedbackEnabled() 3762 * @see #performHapticFeedback(int) 3763 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3764 */ 3765 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3766 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3767 } 3768 3769 /** 3770 * @return whether this view should have haptic feedback enabled for events 3771 * long presses. 3772 * 3773 * @see #setHapticFeedbackEnabled(boolean) 3774 * @see #performHapticFeedback(int) 3775 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3776 */ 3777 @ViewDebug.ExportedProperty 3778 public boolean isHapticFeedbackEnabled() { 3779 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3780 } 3781 3782 /** 3783 * If this view doesn't do any drawing on its own, set this flag to 3784 * allow further optimizations. By default, this flag is not set on 3785 * View, but could be set on some View subclasses such as ViewGroup. 3786 * 3787 * Typically, if you override {@link #onDraw} you should clear this flag. 3788 * 3789 * @param willNotDraw whether or not this View draw on its own 3790 */ 3791 public void setWillNotDraw(boolean willNotDraw) { 3792 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3793 } 3794 3795 /** 3796 * Returns whether or not this View draws on its own. 3797 * 3798 * @return true if this view has nothing to draw, false otherwise 3799 */ 3800 @ViewDebug.ExportedProperty(category = "drawing") 3801 public boolean willNotDraw() { 3802 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3803 } 3804 3805 /** 3806 * When a View's drawing cache is enabled, drawing is redirected to an 3807 * offscreen bitmap. Some views, like an ImageView, must be able to 3808 * bypass this mechanism if they already draw a single bitmap, to avoid 3809 * unnecessary usage of the memory. 3810 * 3811 * @param willNotCacheDrawing true if this view does not cache its 3812 * drawing, false otherwise 3813 */ 3814 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3815 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3816 } 3817 3818 /** 3819 * Returns whether or not this View can cache its drawing or not. 3820 * 3821 * @return true if this view does not cache its drawing, false otherwise 3822 */ 3823 @ViewDebug.ExportedProperty(category = "drawing") 3824 public boolean willNotCacheDrawing() { 3825 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3826 } 3827 3828 /** 3829 * Indicates whether this view reacts to click events or not. 3830 * 3831 * @return true if the view is clickable, false otherwise 3832 * 3833 * @see #setClickable(boolean) 3834 * @attr ref android.R.styleable#View_clickable 3835 */ 3836 @ViewDebug.ExportedProperty 3837 public boolean isClickable() { 3838 return (mViewFlags & CLICKABLE) == CLICKABLE; 3839 } 3840 3841 /** 3842 * Enables or disables click events for this view. When a view 3843 * is clickable it will change its state to "pressed" on every click. 3844 * Subclasses should set the view clickable to visually react to 3845 * user's clicks. 3846 * 3847 * @param clickable true to make the view clickable, false otherwise 3848 * 3849 * @see #isClickable() 3850 * @attr ref android.R.styleable#View_clickable 3851 */ 3852 public void setClickable(boolean clickable) { 3853 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3854 } 3855 3856 /** 3857 * Indicates whether this view reacts to long click events or not. 3858 * 3859 * @return true if the view is long clickable, false otherwise 3860 * 3861 * @see #setLongClickable(boolean) 3862 * @attr ref android.R.styleable#View_longClickable 3863 */ 3864 public boolean isLongClickable() { 3865 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 3866 } 3867 3868 /** 3869 * Enables or disables long click events for this view. When a view is long 3870 * clickable it reacts to the user holding down the button for a longer 3871 * duration than a tap. This event can either launch the listener or a 3872 * context menu. 3873 * 3874 * @param longClickable true to make the view long clickable, false otherwise 3875 * @see #isLongClickable() 3876 * @attr ref android.R.styleable#View_longClickable 3877 */ 3878 public void setLongClickable(boolean longClickable) { 3879 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 3880 } 3881 3882 /** 3883 * Sets the pressed state for this view. 3884 * 3885 * @see #isClickable() 3886 * @see #setClickable(boolean) 3887 * 3888 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 3889 * the View's internal state from a previously set "pressed" state. 3890 */ 3891 public void setPressed(boolean pressed) { 3892 if (pressed) { 3893 mPrivateFlags |= PRESSED; 3894 } else { 3895 mPrivateFlags &= ~PRESSED; 3896 } 3897 refreshDrawableState(); 3898 dispatchSetPressed(pressed); 3899 } 3900 3901 /** 3902 * Dispatch setPressed to all of this View's children. 3903 * 3904 * @see #setPressed(boolean) 3905 * 3906 * @param pressed The new pressed state 3907 */ 3908 protected void dispatchSetPressed(boolean pressed) { 3909 } 3910 3911 /** 3912 * Indicates whether the view is currently in pressed state. Unless 3913 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 3914 * the pressed state. 3915 * 3916 * @see #setPressed 3917 * @see #isClickable() 3918 * @see #setClickable(boolean) 3919 * 3920 * @return true if the view is currently pressed, false otherwise 3921 */ 3922 public boolean isPressed() { 3923 return (mPrivateFlags & PRESSED) == PRESSED; 3924 } 3925 3926 /** 3927 * Indicates whether this view will save its state (that is, 3928 * whether its {@link #onSaveInstanceState} method will be called). 3929 * 3930 * @return Returns true if the view state saving is enabled, else false. 3931 * 3932 * @see #setSaveEnabled(boolean) 3933 * @attr ref android.R.styleable#View_saveEnabled 3934 */ 3935 public boolean isSaveEnabled() { 3936 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 3937 } 3938 3939 /** 3940 * Controls whether the saving of this view's state is 3941 * enabled (that is, whether its {@link #onSaveInstanceState} method 3942 * will be called). Note that even if freezing is enabled, the 3943 * view still must have an id assigned to it (via {@link #setId setId()}) 3944 * for its state to be saved. This flag can only disable the 3945 * saving of this view; any child views may still have their state saved. 3946 * 3947 * @param enabled Set to false to <em>disable</em> state saving, or true 3948 * (the default) to allow it. 3949 * 3950 * @see #isSaveEnabled() 3951 * @see #setId(int) 3952 * @see #onSaveInstanceState() 3953 * @attr ref android.R.styleable#View_saveEnabled 3954 */ 3955 public void setSaveEnabled(boolean enabled) { 3956 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 3957 } 3958 3959 /** 3960 * Gets whether the framework should discard touches when the view's 3961 * window is obscured by another visible window. 3962 * Refer to the {@link View} security documentation for more details. 3963 * 3964 * @return True if touch filtering is enabled. 3965 * 3966 * @see #setFilterTouchesWhenObscured(boolean) 3967 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3968 */ 3969 @ViewDebug.ExportedProperty 3970 public boolean getFilterTouchesWhenObscured() { 3971 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 3972 } 3973 3974 /** 3975 * Sets whether the framework should discard touches when the view's 3976 * window is obscured by another visible window. 3977 * Refer to the {@link View} security documentation for more details. 3978 * 3979 * @param enabled True if touch filtering should be enabled. 3980 * 3981 * @see #getFilterTouchesWhenObscured 3982 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3983 */ 3984 public void setFilterTouchesWhenObscured(boolean enabled) { 3985 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 3986 FILTER_TOUCHES_WHEN_OBSCURED); 3987 } 3988 3989 /** 3990 * Indicates whether the entire hierarchy under this view will save its 3991 * state when a state saving traversal occurs from its parent. The default 3992 * is true; if false, these views will not be saved unless 3993 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 3994 * 3995 * @return Returns true if the view state saving from parent is enabled, else false. 3996 * 3997 * @see #setSaveFromParentEnabled(boolean) 3998 */ 3999 public boolean isSaveFromParentEnabled() { 4000 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4001 } 4002 4003 /** 4004 * Controls whether the entire hierarchy under this view will save its 4005 * state when a state saving traversal occurs from its parent. The default 4006 * is true; if false, these views will not be saved unless 4007 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4008 * 4009 * @param enabled Set to false to <em>disable</em> state saving, or true 4010 * (the default) to allow it. 4011 * 4012 * @see #isSaveFromParentEnabled() 4013 * @see #setId(int) 4014 * @see #onSaveInstanceState() 4015 */ 4016 public void setSaveFromParentEnabled(boolean enabled) { 4017 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4018 } 4019 4020 4021 /** 4022 * Returns whether this View is able to take focus. 4023 * 4024 * @return True if this view can take focus, or false otherwise. 4025 * @attr ref android.R.styleable#View_focusable 4026 */ 4027 @ViewDebug.ExportedProperty(category = "focus") 4028 public final boolean isFocusable() { 4029 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4030 } 4031 4032 /** 4033 * When a view is focusable, it may not want to take focus when in touch mode. 4034 * For example, a button would like focus when the user is navigating via a D-pad 4035 * so that the user can click on it, but once the user starts touching the screen, 4036 * the button shouldn't take focus 4037 * @return Whether the view is focusable in touch mode. 4038 * @attr ref android.R.styleable#View_focusableInTouchMode 4039 */ 4040 @ViewDebug.ExportedProperty 4041 public final boolean isFocusableInTouchMode() { 4042 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4043 } 4044 4045 /** 4046 * Find the nearest view in the specified direction that can take focus. 4047 * This does not actually give focus to that view. 4048 * 4049 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4050 * 4051 * @return The nearest focusable in the specified direction, or null if none 4052 * can be found. 4053 */ 4054 public View focusSearch(int direction) { 4055 if (mParent != null) { 4056 return mParent.focusSearch(this, direction); 4057 } else { 4058 return null; 4059 } 4060 } 4061 4062 /** 4063 * This method is the last chance for the focused view and its ancestors to 4064 * respond to an arrow key. This is called when the focused view did not 4065 * consume the key internally, nor could the view system find a new view in 4066 * the requested direction to give focus to. 4067 * 4068 * @param focused The currently focused view. 4069 * @param direction The direction focus wants to move. One of FOCUS_UP, 4070 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4071 * @return True if the this view consumed this unhandled move. 4072 */ 4073 public boolean dispatchUnhandledMove(View focused, int direction) { 4074 return false; 4075 } 4076 4077 /** 4078 * If a user manually specified the next view id for a particular direction, 4079 * use the root to look up the view. 4080 * @param root The root view of the hierarchy containing this view. 4081 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4082 * or FOCUS_BACKWARD. 4083 * @return The user specified next view, or null if there is none. 4084 */ 4085 View findUserSetNextFocus(View root, int direction) { 4086 switch (direction) { 4087 case FOCUS_LEFT: 4088 if (mNextFocusLeftId == View.NO_ID) return null; 4089 return findViewShouldExist(root, mNextFocusLeftId); 4090 case FOCUS_RIGHT: 4091 if (mNextFocusRightId == View.NO_ID) return null; 4092 return findViewShouldExist(root, mNextFocusRightId); 4093 case FOCUS_UP: 4094 if (mNextFocusUpId == View.NO_ID) return null; 4095 return findViewShouldExist(root, mNextFocusUpId); 4096 case FOCUS_DOWN: 4097 if (mNextFocusDownId == View.NO_ID) return null; 4098 return findViewShouldExist(root, mNextFocusDownId); 4099 case FOCUS_FORWARD: 4100 if (mNextFocusForwardId == View.NO_ID) return null; 4101 return findViewShouldExist(root, mNextFocusForwardId); 4102 case FOCUS_BACKWARD: { 4103 final int id = mID; 4104 return root.findViewByPredicate(new Predicate<View>() { 4105 @Override 4106 public boolean apply(View t) { 4107 return t.mNextFocusForwardId == id; 4108 } 4109 }); 4110 } 4111 } 4112 return null; 4113 } 4114 4115 private static View findViewShouldExist(View root, int childViewId) { 4116 View result = root.findViewById(childViewId); 4117 if (result == null) { 4118 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4119 + "by user for id " + childViewId); 4120 } 4121 return result; 4122 } 4123 4124 /** 4125 * Find and return all focusable views that are descendants of this view, 4126 * possibly including this view if it is focusable itself. 4127 * 4128 * @param direction The direction of the focus 4129 * @return A list of focusable views 4130 */ 4131 public ArrayList<View> getFocusables(int direction) { 4132 ArrayList<View> result = new ArrayList<View>(24); 4133 addFocusables(result, direction); 4134 return result; 4135 } 4136 4137 /** 4138 * Add any focusable views that are descendants of this view (possibly 4139 * including this view if it is focusable itself) to views. If we are in touch mode, 4140 * only add views that are also focusable in touch mode. 4141 * 4142 * @param views Focusable views found so far 4143 * @param direction The direction of the focus 4144 */ 4145 public void addFocusables(ArrayList<View> views, int direction) { 4146 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4147 } 4148 4149 /** 4150 * Adds any focusable views that are descendants of this view (possibly 4151 * including this view if it is focusable itself) to views. This method 4152 * adds all focusable views regardless if we are in touch mode or 4153 * only views focusable in touch mode if we are in touch mode depending on 4154 * the focusable mode paramater. 4155 * 4156 * @param views Focusable views found so far or null if all we are interested is 4157 * the number of focusables. 4158 * @param direction The direction of the focus. 4159 * @param focusableMode The type of focusables to be added. 4160 * 4161 * @see #FOCUSABLES_ALL 4162 * @see #FOCUSABLES_TOUCH_MODE 4163 */ 4164 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4165 if (!isFocusable()) { 4166 return; 4167 } 4168 4169 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4170 isInTouchMode() && !isFocusableInTouchMode()) { 4171 return; 4172 } 4173 4174 if (views != null) { 4175 views.add(this); 4176 } 4177 } 4178 4179 /** 4180 * Find and return all touchable views that are descendants of this view, 4181 * possibly including this view if it is touchable itself. 4182 * 4183 * @return A list of touchable views 4184 */ 4185 public ArrayList<View> getTouchables() { 4186 ArrayList<View> result = new ArrayList<View>(); 4187 addTouchables(result); 4188 return result; 4189 } 4190 4191 /** 4192 * Add any touchable views that are descendants of this view (possibly 4193 * including this view if it is touchable itself) to views. 4194 * 4195 * @param views Touchable views found so far 4196 */ 4197 public void addTouchables(ArrayList<View> views) { 4198 final int viewFlags = mViewFlags; 4199 4200 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4201 && (viewFlags & ENABLED_MASK) == ENABLED) { 4202 views.add(this); 4203 } 4204 } 4205 4206 /** 4207 * Call this to try to give focus to a specific view or to one of its 4208 * descendants. 4209 * 4210 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4211 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4212 * while the device is in touch mode. 4213 * 4214 * See also {@link #focusSearch}, which is what you call to say that you 4215 * have focus, and you want your parent to look for the next one. 4216 * 4217 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4218 * {@link #FOCUS_DOWN} and <code>null</code>. 4219 * 4220 * @return Whether this view or one of its descendants actually took focus. 4221 */ 4222 public final boolean requestFocus() { 4223 return requestFocus(View.FOCUS_DOWN); 4224 } 4225 4226 4227 /** 4228 * Call this to try to give focus to a specific view or to one of its 4229 * descendants and give it a hint about what direction focus is heading. 4230 * 4231 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4232 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4233 * while the device is in touch mode. 4234 * 4235 * See also {@link #focusSearch}, which is what you call to say that you 4236 * have focus, and you want your parent to look for the next one. 4237 * 4238 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4239 * <code>null</code> set for the previously focused rectangle. 4240 * 4241 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4242 * @return Whether this view or one of its descendants actually took focus. 4243 */ 4244 public final boolean requestFocus(int direction) { 4245 return requestFocus(direction, null); 4246 } 4247 4248 /** 4249 * Call this to try to give focus to a specific view or to one of its descendants 4250 * and give it hints about the direction and a specific rectangle that the focus 4251 * is coming from. The rectangle can help give larger views a finer grained hint 4252 * about where focus is coming from, and therefore, where to show selection, or 4253 * forward focus change internally. 4254 * 4255 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4256 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4257 * while the device is in touch mode. 4258 * 4259 * A View will not take focus if it is not visible. 4260 * 4261 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 4262 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4263 * 4264 * See also {@link #focusSearch}, which is what you call to say that you 4265 * have focus, and you want your parent to look for the next one. 4266 * 4267 * You may wish to override this method if your custom {@link View} has an internal 4268 * {@link View} that it wishes to forward the request to. 4269 * 4270 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4271 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4272 * to give a finer grained hint about where focus is coming from. May be null 4273 * if there is no hint. 4274 * @return Whether this view or one of its descendants actually took focus. 4275 */ 4276 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4277 // need to be focusable 4278 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4279 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4280 return false; 4281 } 4282 4283 // need to be focusable in touch mode if in touch mode 4284 if (isInTouchMode() && 4285 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4286 return false; 4287 } 4288 4289 // need to not have any parents blocking us 4290 if (hasAncestorThatBlocksDescendantFocus()) { 4291 return false; 4292 } 4293 4294 handleFocusGainInternal(direction, previouslyFocusedRect); 4295 return true; 4296 } 4297 4298 /** Gets the ViewRoot, or null if not attached. */ 4299 /*package*/ ViewRoot getViewRoot() { 4300 View root = getRootView(); 4301 return root != null ? (ViewRoot)root.getParent() : null; 4302 } 4303 4304 /** 4305 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4306 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4307 * touch mode to request focus when they are touched. 4308 * 4309 * @return Whether this view or one of its descendants actually took focus. 4310 * 4311 * @see #isInTouchMode() 4312 * 4313 */ 4314 public final boolean requestFocusFromTouch() { 4315 // Leave touch mode if we need to 4316 if (isInTouchMode()) { 4317 ViewRoot viewRoot = getViewRoot(); 4318 if (viewRoot != null) { 4319 viewRoot.ensureTouchMode(false); 4320 } 4321 } 4322 return requestFocus(View.FOCUS_DOWN); 4323 } 4324 4325 /** 4326 * @return Whether any ancestor of this view blocks descendant focus. 4327 */ 4328 private boolean hasAncestorThatBlocksDescendantFocus() { 4329 ViewParent ancestor = mParent; 4330 while (ancestor instanceof ViewGroup) { 4331 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4332 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4333 return true; 4334 } else { 4335 ancestor = vgAncestor.getParent(); 4336 } 4337 } 4338 return false; 4339 } 4340 4341 /** 4342 * @hide 4343 */ 4344 public void dispatchStartTemporaryDetach() { 4345 onStartTemporaryDetach(); 4346 } 4347 4348 /** 4349 * This is called when a container is going to temporarily detach a child, with 4350 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4351 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4352 * {@link #onDetachedFromWindow()} when the container is done. 4353 */ 4354 public void onStartTemporaryDetach() { 4355 removeUnsetPressCallback(); 4356 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4357 } 4358 4359 /** 4360 * @hide 4361 */ 4362 public void dispatchFinishTemporaryDetach() { 4363 onFinishTemporaryDetach(); 4364 } 4365 4366 /** 4367 * Called after {@link #onStartTemporaryDetach} when the container is done 4368 * changing the view. 4369 */ 4370 public void onFinishTemporaryDetach() { 4371 } 4372 4373 /** 4374 * capture information of this view for later analysis: developement only 4375 * check dynamic switch to make sure we only dump view 4376 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4377 */ 4378 private static void captureViewInfo(String subTag, View v) { 4379 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4380 return; 4381 } 4382 ViewDebug.dumpCapturedView(subTag, v); 4383 } 4384 4385 /** 4386 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4387 * for this view's window. Returns null if the view is not currently attached 4388 * to the window. Normally you will not need to use this directly, but 4389 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4390 */ 4391 public KeyEvent.DispatcherState getKeyDispatcherState() { 4392 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4393 } 4394 4395 /** 4396 * Dispatch a key event before it is processed by any input method 4397 * associated with the view hierarchy. This can be used to intercept 4398 * key events in special situations before the IME consumes them; a 4399 * typical example would be handling the BACK key to update the application's 4400 * UI instead of allowing the IME to see it and close itself. 4401 * 4402 * @param event The key event to be dispatched. 4403 * @return True if the event was handled, false otherwise. 4404 */ 4405 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4406 return onKeyPreIme(event.getKeyCode(), event); 4407 } 4408 4409 /** 4410 * Dispatch a key event to the next view on the focus path. This path runs 4411 * from the top of the view tree down to the currently focused view. If this 4412 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4413 * the next node down the focus path. This method also fires any key 4414 * listeners. 4415 * 4416 * @param event The key event to be dispatched. 4417 * @return True if the event was handled, false otherwise. 4418 */ 4419 public boolean dispatchKeyEvent(KeyEvent event) { 4420 // If any attached key listener a first crack at the event. 4421 4422 //noinspection SimplifiableIfStatement,deprecation 4423 if (android.util.Config.LOGV) { 4424 captureViewInfo("captureViewKeyEvent", this); 4425 } 4426 4427 //noinspection SimplifiableIfStatement 4428 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4429 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4430 return true; 4431 } 4432 4433 return event.dispatch(this, mAttachInfo != null 4434 ? mAttachInfo.mKeyDispatchState : null, this); 4435 } 4436 4437 /** 4438 * Dispatches a key shortcut event. 4439 * 4440 * @param event The key event to be dispatched. 4441 * @return True if the event was handled by the view, false otherwise. 4442 */ 4443 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4444 return onKeyShortcut(event.getKeyCode(), event); 4445 } 4446 4447 /** 4448 * Pass the touch screen motion event down to the target view, or this 4449 * view if it is the target. 4450 * 4451 * @param event The motion event to be dispatched. 4452 * @return True if the event was handled by the view, false otherwise. 4453 */ 4454 public boolean dispatchTouchEvent(MotionEvent event) { 4455 if (!onFilterTouchEventForSecurity(event)) { 4456 return false; 4457 } 4458 4459 //noinspection SimplifiableIfStatement 4460 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4461 mOnTouchListener.onTouch(this, event)) { 4462 return true; 4463 } 4464 return onTouchEvent(event); 4465 } 4466 4467 /** 4468 * Filter the touch event to apply security policies. 4469 * 4470 * @param event The motion event to be filtered. 4471 * @return True if the event should be dispatched, false if the event should be dropped. 4472 * 4473 * @see #getFilterTouchesWhenObscured 4474 */ 4475 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4476 //noinspection RedundantIfStatement 4477 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4478 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4479 // Window is obscured, drop this touch. 4480 return false; 4481 } 4482 return true; 4483 } 4484 4485 /** 4486 * Pass a trackball motion event down to the focused view. 4487 * 4488 * @param event The motion event to be dispatched. 4489 * @return True if the event was handled by the view, false otherwise. 4490 */ 4491 public boolean dispatchTrackballEvent(MotionEvent event) { 4492 //Log.i("view", "view=" + this + ", " + event.toString()); 4493 return onTrackballEvent(event); 4494 } 4495 4496 /** 4497 * Called when the window containing this view gains or loses window focus. 4498 * ViewGroups should override to route to their children. 4499 * 4500 * @param hasFocus True if the window containing this view now has focus, 4501 * false otherwise. 4502 */ 4503 public void dispatchWindowFocusChanged(boolean hasFocus) { 4504 onWindowFocusChanged(hasFocus); 4505 } 4506 4507 /** 4508 * Called when the window containing this view gains or loses focus. Note 4509 * that this is separate from view focus: to receive key events, both 4510 * your view and its window must have focus. If a window is displayed 4511 * on top of yours that takes input focus, then your own window will lose 4512 * focus but the view focus will remain unchanged. 4513 * 4514 * @param hasWindowFocus True if the window containing this view now has 4515 * focus, false otherwise. 4516 */ 4517 public void onWindowFocusChanged(boolean hasWindowFocus) { 4518 InputMethodManager imm = InputMethodManager.peekInstance(); 4519 if (!hasWindowFocus) { 4520 if (isPressed()) { 4521 setPressed(false); 4522 } 4523 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4524 imm.focusOut(this); 4525 } 4526 removeLongPressCallback(); 4527 removeTapCallback(); 4528 onFocusLost(); 4529 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4530 imm.focusIn(this); 4531 } 4532 refreshDrawableState(); 4533 } 4534 4535 /** 4536 * Returns true if this view is in a window that currently has window focus. 4537 * Note that this is not the same as the view itself having focus. 4538 * 4539 * @return True if this view is in a window that currently has window focus. 4540 */ 4541 public boolean hasWindowFocus() { 4542 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4543 } 4544 4545 /** 4546 * Dispatch a view visibility change down the view hierarchy. 4547 * ViewGroups should override to route to their children. 4548 * @param changedView The view whose visibility changed. Could be 'this' or 4549 * an ancestor view. 4550 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4551 * {@link #INVISIBLE} or {@link #GONE}. 4552 */ 4553 protected void dispatchVisibilityChanged(View changedView, int visibility) { 4554 onVisibilityChanged(changedView, visibility); 4555 } 4556 4557 /** 4558 * Called when the visibility of the view or an ancestor of the view is changed. 4559 * @param changedView The view whose visibility changed. Could be 'this' or 4560 * an ancestor view. 4561 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4562 * {@link #INVISIBLE} or {@link #GONE}. 4563 */ 4564 protected void onVisibilityChanged(View changedView, int visibility) { 4565 if (visibility == VISIBLE) { 4566 if (mAttachInfo != null) { 4567 initialAwakenScrollBars(); 4568 } else { 4569 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4570 } 4571 } 4572 } 4573 4574 /** 4575 * Dispatch a hint about whether this view is displayed. For instance, when 4576 * a View moves out of the screen, it might receives a display hint indicating 4577 * the view is not displayed. Applications should not <em>rely</em> on this hint 4578 * as there is no guarantee that they will receive one. 4579 * 4580 * @param hint A hint about whether or not this view is displayed: 4581 * {@link #VISIBLE} or {@link #INVISIBLE}. 4582 */ 4583 public void dispatchDisplayHint(int hint) { 4584 onDisplayHint(hint); 4585 } 4586 4587 /** 4588 * Gives this view a hint about whether is displayed or not. For instance, when 4589 * a View moves out of the screen, it might receives a display hint indicating 4590 * the view is not displayed. Applications should not <em>rely</em> on this hint 4591 * as there is no guarantee that they will receive one. 4592 * 4593 * @param hint A hint about whether or not this view is displayed: 4594 * {@link #VISIBLE} or {@link #INVISIBLE}. 4595 */ 4596 protected void onDisplayHint(int hint) { 4597 } 4598 4599 /** 4600 * Dispatch a window visibility change down the view hierarchy. 4601 * ViewGroups should override to route to their children. 4602 * 4603 * @param visibility The new visibility of the window. 4604 * 4605 * @see #onWindowVisibilityChanged 4606 */ 4607 public void dispatchWindowVisibilityChanged(int visibility) { 4608 onWindowVisibilityChanged(visibility); 4609 } 4610 4611 /** 4612 * Called when the window containing has change its visibility 4613 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4614 * that this tells you whether or not your window is being made visible 4615 * to the window manager; this does <em>not</em> tell you whether or not 4616 * your window is obscured by other windows on the screen, even if it 4617 * is itself visible. 4618 * 4619 * @param visibility The new visibility of the window. 4620 */ 4621 protected void onWindowVisibilityChanged(int visibility) { 4622 if (visibility == VISIBLE) { 4623 initialAwakenScrollBars(); 4624 } 4625 } 4626 4627 /** 4628 * Returns the current visibility of the window this view is attached to 4629 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4630 * 4631 * @return Returns the current visibility of the view's window. 4632 */ 4633 public int getWindowVisibility() { 4634 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4635 } 4636 4637 /** 4638 * Retrieve the overall visible display size in which the window this view is 4639 * attached to has been positioned in. This takes into account screen 4640 * decorations above the window, for both cases where the window itself 4641 * is being position inside of them or the window is being placed under 4642 * then and covered insets are used for the window to position its content 4643 * inside. In effect, this tells you the available area where content can 4644 * be placed and remain visible to users. 4645 * 4646 * <p>This function requires an IPC back to the window manager to retrieve 4647 * the requested information, so should not be used in performance critical 4648 * code like drawing. 4649 * 4650 * @param outRect Filled in with the visible display frame. If the view 4651 * is not attached to a window, this is simply the raw display size. 4652 */ 4653 public void getWindowVisibleDisplayFrame(Rect outRect) { 4654 if (mAttachInfo != null) { 4655 try { 4656 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4657 } catch (RemoteException e) { 4658 return; 4659 } 4660 // XXX This is really broken, and probably all needs to be done 4661 // in the window manager, and we need to know more about whether 4662 // we want the area behind or in front of the IME. 4663 final Rect insets = mAttachInfo.mVisibleInsets; 4664 outRect.left += insets.left; 4665 outRect.top += insets.top; 4666 outRect.right -= insets.right; 4667 outRect.bottom -= insets.bottom; 4668 return; 4669 } 4670 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4671 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4672 } 4673 4674 /** 4675 * Dispatch a notification about a resource configuration change down 4676 * the view hierarchy. 4677 * ViewGroups should override to route to their children. 4678 * 4679 * @param newConfig The new resource configuration. 4680 * 4681 * @see #onConfigurationChanged 4682 */ 4683 public void dispatchConfigurationChanged(Configuration newConfig) { 4684 onConfigurationChanged(newConfig); 4685 } 4686 4687 /** 4688 * Called when the current configuration of the resources being used 4689 * by the application have changed. You can use this to decide when 4690 * to reload resources that can changed based on orientation and other 4691 * configuration characterstics. You only need to use this if you are 4692 * not relying on the normal {@link android.app.Activity} mechanism of 4693 * recreating the activity instance upon a configuration change. 4694 * 4695 * @param newConfig The new resource configuration. 4696 */ 4697 protected void onConfigurationChanged(Configuration newConfig) { 4698 } 4699 4700 /** 4701 * Private function to aggregate all per-view attributes in to the view 4702 * root. 4703 */ 4704 void dispatchCollectViewAttributes(int visibility) { 4705 performCollectViewAttributes(visibility); 4706 } 4707 4708 void performCollectViewAttributes(int visibility) { 4709 //noinspection PointlessBitwiseExpression 4710 if (((visibility | mViewFlags) & (VISIBILITY_MASK | KEEP_SCREEN_ON)) 4711 == (VISIBLE | KEEP_SCREEN_ON)) { 4712 mAttachInfo.mKeepScreenOn = true; 4713 } 4714 } 4715 4716 void needGlobalAttributesUpdate(boolean force) { 4717 AttachInfo ai = mAttachInfo; 4718 if (ai != null) { 4719 if (ai.mKeepScreenOn || force) { 4720 ai.mRecomputeGlobalAttributes = true; 4721 } 4722 } 4723 } 4724 4725 /** 4726 * Returns whether the device is currently in touch mode. Touch mode is entered 4727 * once the user begins interacting with the device by touch, and affects various 4728 * things like whether focus is always visible to the user. 4729 * 4730 * @return Whether the device is in touch mode. 4731 */ 4732 @ViewDebug.ExportedProperty 4733 public boolean isInTouchMode() { 4734 if (mAttachInfo != null) { 4735 return mAttachInfo.mInTouchMode; 4736 } else { 4737 return ViewRoot.isInTouchMode(); 4738 } 4739 } 4740 4741 /** 4742 * Returns the context the view is running in, through which it can 4743 * access the current theme, resources, etc. 4744 * 4745 * @return The view's Context. 4746 */ 4747 @ViewDebug.CapturedViewProperty 4748 public final Context getContext() { 4749 return mContext; 4750 } 4751 4752 /** 4753 * Handle a key event before it is processed by any input method 4754 * associated with the view hierarchy. This can be used to intercept 4755 * key events in special situations before the IME consumes them; a 4756 * typical example would be handling the BACK key to update the application's 4757 * UI instead of allowing the IME to see it and close itself. 4758 * 4759 * @param keyCode The value in event.getKeyCode(). 4760 * @param event Description of the key event. 4761 * @return If you handled the event, return true. If you want to allow the 4762 * event to be handled by the next receiver, return false. 4763 */ 4764 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4765 return false; 4766 } 4767 4768 /** 4769 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 4770 * KeyEvent.Callback.onKeyDown()}: perform press of the view 4771 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4772 * is released, if the view is enabled and clickable. 4773 * 4774 * @param keyCode A key code that represents the button pressed, from 4775 * {@link android.view.KeyEvent}. 4776 * @param event The KeyEvent object that defines the button action. 4777 */ 4778 public boolean onKeyDown(int keyCode, KeyEvent event) { 4779 boolean result = false; 4780 4781 switch (keyCode) { 4782 case KeyEvent.KEYCODE_DPAD_CENTER: 4783 case KeyEvent.KEYCODE_ENTER: { 4784 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4785 return true; 4786 } 4787 // Long clickable items don't necessarily have to be clickable 4788 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4789 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4790 (event.getRepeatCount() == 0)) { 4791 setPressed(true); 4792 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4793 postCheckForLongClick(0); 4794 } 4795 return true; 4796 } 4797 break; 4798 } 4799 } 4800 return result; 4801 } 4802 4803 /** 4804 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4805 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4806 * the event). 4807 */ 4808 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 4809 return false; 4810 } 4811 4812 /** 4813 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 4814 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 4815 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 4816 * {@link KeyEvent#KEYCODE_ENTER} is released. 4817 * 4818 * @param keyCode A key code that represents the button pressed, from 4819 * {@link android.view.KeyEvent}. 4820 * @param event The KeyEvent object that defines the button action. 4821 */ 4822 public boolean onKeyUp(int keyCode, KeyEvent event) { 4823 boolean result = false; 4824 4825 switch (keyCode) { 4826 case KeyEvent.KEYCODE_DPAD_CENTER: 4827 case KeyEvent.KEYCODE_ENTER: { 4828 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4829 return true; 4830 } 4831 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 4832 setPressed(false); 4833 4834 if (!mHasPerformedLongPress) { 4835 // This is a tap, so remove the longpress check 4836 removeLongPressCallback(); 4837 4838 result = performClick(); 4839 } 4840 } 4841 break; 4842 } 4843 } 4844 return result; 4845 } 4846 4847 /** 4848 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4849 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 4850 * the event). 4851 * 4852 * @param keyCode A key code that represents the button pressed, from 4853 * {@link android.view.KeyEvent}. 4854 * @param repeatCount The number of times the action was made. 4855 * @param event The KeyEvent object that defines the button action. 4856 */ 4857 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 4858 return false; 4859 } 4860 4861 /** 4862 * Called on the focused view when a key shortcut event is not handled. 4863 * Override this method to implement local key shortcuts for the View. 4864 * Key shortcuts can also be implemented by setting the 4865 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 4866 * 4867 * @param keyCode The value in event.getKeyCode(). 4868 * @param event Description of the key event. 4869 * @return If you handled the event, return true. If you want to allow the 4870 * event to be handled by the next receiver, return false. 4871 */ 4872 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 4873 return false; 4874 } 4875 4876 /** 4877 * Check whether the called view is a text editor, in which case it 4878 * would make sense to automatically display a soft input window for 4879 * it. Subclasses should override this if they implement 4880 * {@link #onCreateInputConnection(EditorInfo)} to return true if 4881 * a call on that method would return a non-null InputConnection, and 4882 * they are really a first-class editor that the user would normally 4883 * start typing on when the go into a window containing your view. 4884 * 4885 * <p>The default implementation always returns false. This does 4886 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 4887 * will not be called or the user can not otherwise perform edits on your 4888 * view; it is just a hint to the system that this is not the primary 4889 * purpose of this view. 4890 * 4891 * @return Returns true if this view is a text editor, else false. 4892 */ 4893 public boolean onCheckIsTextEditor() { 4894 return false; 4895 } 4896 4897 /** 4898 * Create a new InputConnection for an InputMethod to interact 4899 * with the view. The default implementation returns null, since it doesn't 4900 * support input methods. You can override this to implement such support. 4901 * This is only needed for views that take focus and text input. 4902 * 4903 * <p>When implementing this, you probably also want to implement 4904 * {@link #onCheckIsTextEditor()} to indicate you will return a 4905 * non-null InputConnection. 4906 * 4907 * @param outAttrs Fill in with attribute information about the connection. 4908 */ 4909 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 4910 return null; 4911 } 4912 4913 /** 4914 * Called by the {@link android.view.inputmethod.InputMethodManager} 4915 * when a view who is not the current 4916 * input connection target is trying to make a call on the manager. The 4917 * default implementation returns false; you can override this to return 4918 * true for certain views if you are performing InputConnection proxying 4919 * to them. 4920 * @param view The View that is making the InputMethodManager call. 4921 * @return Return true to allow the call, false to reject. 4922 */ 4923 public boolean checkInputConnectionProxy(View view) { 4924 return false; 4925 } 4926 4927 /** 4928 * Show the context menu for this view. It is not safe to hold on to the 4929 * menu after returning from this method. 4930 * 4931 * You should normally not overload this method. Overload 4932 * {@link #onCreateContextMenu(ContextMenu)} or define an 4933 * {@link OnCreateContextMenuListener} to add items to the context menu. 4934 * 4935 * @param menu The context menu to populate 4936 */ 4937 public void createContextMenu(ContextMenu menu) { 4938 ContextMenuInfo menuInfo = getContextMenuInfo(); 4939 4940 // Sets the current menu info so all items added to menu will have 4941 // my extra info set. 4942 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 4943 4944 onCreateContextMenu(menu); 4945 if (mOnCreateContextMenuListener != null) { 4946 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 4947 } 4948 4949 // Clear the extra information so subsequent items that aren't mine don't 4950 // have my extra info. 4951 ((MenuBuilder)menu).setCurrentMenuInfo(null); 4952 4953 if (mParent != null) { 4954 mParent.createContextMenu(menu); 4955 } 4956 } 4957 4958 /** 4959 * Views should implement this if they have extra information to associate 4960 * with the context menu. The return result is supplied as a parameter to 4961 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 4962 * callback. 4963 * 4964 * @return Extra information about the item for which the context menu 4965 * should be shown. This information will vary across different 4966 * subclasses of View. 4967 */ 4968 protected ContextMenuInfo getContextMenuInfo() { 4969 return null; 4970 } 4971 4972 /** 4973 * Views should implement this if the view itself is going to add items to 4974 * the context menu. 4975 * 4976 * @param menu the context menu to populate 4977 */ 4978 protected void onCreateContextMenu(ContextMenu menu) { 4979 } 4980 4981 /** 4982 * Implement this method to handle trackball motion events. The 4983 * <em>relative</em> movement of the trackball since the last event 4984 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 4985 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 4986 * that a movement of 1 corresponds to the user pressing one DPAD key (so 4987 * they will often be fractional values, representing the more fine-grained 4988 * movement information available from a trackball). 4989 * 4990 * @param event The motion event. 4991 * @return True if the event was handled, false otherwise. 4992 */ 4993 public boolean onTrackballEvent(MotionEvent event) { 4994 return false; 4995 } 4996 4997 /** 4998 * Implement this method to handle touch screen motion events. 4999 * 5000 * @param event The motion event. 5001 * @return True if the event was handled, false otherwise. 5002 */ 5003 public boolean onTouchEvent(MotionEvent event) { 5004 final int viewFlags = mViewFlags; 5005 5006 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5007 // A disabled view that is clickable still consumes the touch 5008 // events, it just doesn't respond to them. 5009 return (((viewFlags & CLICKABLE) == CLICKABLE || 5010 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5011 } 5012 5013 if (mTouchDelegate != null) { 5014 if (mTouchDelegate.onTouchEvent(event)) { 5015 return true; 5016 } 5017 } 5018 5019 if (((viewFlags & CLICKABLE) == CLICKABLE || 5020 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5021 switch (event.getAction()) { 5022 case MotionEvent.ACTION_UP: 5023 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5024 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5025 // take focus if we don't have it already and we should in 5026 // touch mode. 5027 boolean focusTaken = false; 5028 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5029 focusTaken = requestFocus(); 5030 } 5031 5032 if (prepressed) { 5033 // The button is being released before we actually 5034 // showed it as pressed. Make it show the pressed 5035 // state now (before scheduling the click) to ensure 5036 // the user sees it. 5037 mPrivateFlags |= PRESSED; 5038 refreshDrawableState(); 5039 } 5040 5041 if (!mHasPerformedLongPress) { 5042 // This is a tap, so remove the longpress check 5043 removeLongPressCallback(); 5044 5045 // Only perform take click actions if we were in the pressed state 5046 if (!focusTaken) { 5047 // Use a Runnable and post this rather than calling 5048 // performClick directly. This lets other visual state 5049 // of the view update before click actions start. 5050 if (mPerformClick == null) { 5051 mPerformClick = new PerformClick(); 5052 } 5053 if (!post(mPerformClick)) { 5054 performClick(); 5055 } 5056 } 5057 } 5058 5059 if (mUnsetPressedState == null) { 5060 mUnsetPressedState = new UnsetPressedState(); 5061 } 5062 5063 if (prepressed) { 5064 postDelayed(mUnsetPressedState, 5065 ViewConfiguration.getPressedStateDuration()); 5066 } else if (!post(mUnsetPressedState)) { 5067 // If the post failed, unpress right now 5068 mUnsetPressedState.run(); 5069 } 5070 removeTapCallback(); 5071 } 5072 break; 5073 5074 case MotionEvent.ACTION_DOWN: 5075 if (mPendingCheckForTap == null) { 5076 mPendingCheckForTap = new CheckForTap(); 5077 } 5078 mPrivateFlags |= PREPRESSED; 5079 mHasPerformedLongPress = false; 5080 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5081 break; 5082 5083 case MotionEvent.ACTION_CANCEL: 5084 mPrivateFlags &= ~PRESSED; 5085 refreshDrawableState(); 5086 removeTapCallback(); 5087 break; 5088 5089 case MotionEvent.ACTION_MOVE: 5090 final int x = (int) event.getX(); 5091 final int y = (int) event.getY(); 5092 5093 // Be lenient about moving outside of buttons 5094 if (!pointInView(x, y, mTouchSlop)) { 5095 // Outside button 5096 removeTapCallback(); 5097 if ((mPrivateFlags & PRESSED) != 0) { 5098 // Remove any future long press/tap checks 5099 removeLongPressCallback(); 5100 5101 // Need to switch from pressed to not pressed 5102 mPrivateFlags &= ~PRESSED; 5103 refreshDrawableState(); 5104 } 5105 } 5106 break; 5107 } 5108 return true; 5109 } 5110 5111 return false; 5112 } 5113 5114 /** 5115 * Remove the longpress detection timer. 5116 */ 5117 private void removeLongPressCallback() { 5118 if (mPendingCheckForLongPress != null) { 5119 removeCallbacks(mPendingCheckForLongPress); 5120 } 5121 } 5122 5123 /** 5124 * Remove the pending click action 5125 */ 5126 private void removePerformClickCallback() { 5127 if (mPerformClick != null) { 5128 removeCallbacks(mPerformClick); 5129 } 5130 } 5131 5132 /** 5133 * Remove the prepress detection timer. 5134 */ 5135 private void removeUnsetPressCallback() { 5136 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5137 setPressed(false); 5138 removeCallbacks(mUnsetPressedState); 5139 } 5140 } 5141 5142 /** 5143 * Remove the tap detection timer. 5144 */ 5145 private void removeTapCallback() { 5146 if (mPendingCheckForTap != null) { 5147 mPrivateFlags &= ~PREPRESSED; 5148 removeCallbacks(mPendingCheckForTap); 5149 } 5150 } 5151 5152 /** 5153 * Cancels a pending long press. Your subclass can use this if you 5154 * want the context menu to come up if the user presses and holds 5155 * at the same place, but you don't want it to come up if they press 5156 * and then move around enough to cause scrolling. 5157 */ 5158 public void cancelLongPress() { 5159 removeLongPressCallback(); 5160 5161 /* 5162 * The prepressed state handled by the tap callback is a display 5163 * construct, but the tap callback will post a long press callback 5164 * less its own timeout. Remove it here. 5165 */ 5166 removeTapCallback(); 5167 } 5168 5169 /** 5170 * Sets the TouchDelegate for this View. 5171 */ 5172 public void setTouchDelegate(TouchDelegate delegate) { 5173 mTouchDelegate = delegate; 5174 } 5175 5176 /** 5177 * Gets the TouchDelegate for this View. 5178 */ 5179 public TouchDelegate getTouchDelegate() { 5180 return mTouchDelegate; 5181 } 5182 5183 /** 5184 * Set flags controlling behavior of this view. 5185 * 5186 * @param flags Constant indicating the value which should be set 5187 * @param mask Constant indicating the bit range that should be changed 5188 */ 5189 void setFlags(int flags, int mask) { 5190 int old = mViewFlags; 5191 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5192 5193 int changed = mViewFlags ^ old; 5194 if (changed == 0) { 5195 return; 5196 } 5197 int privateFlags = mPrivateFlags; 5198 5199 /* Check if the FOCUSABLE bit has changed */ 5200 if (((changed & FOCUSABLE_MASK) != 0) && 5201 ((privateFlags & HAS_BOUNDS) !=0)) { 5202 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5203 && ((privateFlags & FOCUSED) != 0)) { 5204 /* Give up focus if we are no longer focusable */ 5205 clearFocus(); 5206 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 5207 && ((privateFlags & FOCUSED) == 0)) { 5208 /* 5209 * Tell the view system that we are now available to take focus 5210 * if no one else already has it. 5211 */ 5212 if (mParent != null) mParent.focusableViewAvailable(this); 5213 } 5214 } 5215 5216 if ((flags & VISIBILITY_MASK) == VISIBLE) { 5217 if ((changed & VISIBILITY_MASK) != 0) { 5218 /* 5219 * If this view is becoming visible, set the DRAWN flag so that 5220 * the next invalidate() will not be skipped. 5221 */ 5222 mPrivateFlags |= DRAWN; 5223 5224 needGlobalAttributesUpdate(true); 5225 5226 // a view becoming visible is worth notifying the parent 5227 // about in case nothing has focus. even if this specific view 5228 // isn't focusable, it may contain something that is, so let 5229 // the root view try to give this focus if nothing else does. 5230 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 5231 mParent.focusableViewAvailable(this); 5232 } 5233 } 5234 } 5235 5236 /* Check if the GONE bit has changed */ 5237 if ((changed & GONE) != 0) { 5238 needGlobalAttributesUpdate(false); 5239 requestLayout(); 5240 invalidate(); 5241 5242 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 5243 if (hasFocus()) clearFocus(); 5244 destroyDrawingCache(); 5245 } 5246 if (mAttachInfo != null) { 5247 mAttachInfo.mViewVisibilityChanged = true; 5248 } 5249 } 5250 5251 /* Check if the VISIBLE bit has changed */ 5252 if ((changed & INVISIBLE) != 0) { 5253 needGlobalAttributesUpdate(false); 5254 invalidate(); 5255 5256 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 5257 // root view becoming invisible shouldn't clear focus 5258 if (getRootView() != this) { 5259 clearFocus(); 5260 } 5261 } 5262 if (mAttachInfo != null) { 5263 mAttachInfo.mViewVisibilityChanged = true; 5264 } 5265 } 5266 5267 if ((changed & VISIBILITY_MASK) != 0) { 5268 if (mParent instanceof ViewGroup) { 5269 ((ViewGroup)mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5270 } 5271 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5272 } 5273 5274 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 5275 destroyDrawingCache(); 5276 } 5277 5278 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 5279 destroyDrawingCache(); 5280 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5281 } 5282 5283 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 5284 destroyDrawingCache(); 5285 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5286 } 5287 5288 if ((changed & DRAW_MASK) != 0) { 5289 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 5290 if (mBGDrawable != null) { 5291 mPrivateFlags &= ~SKIP_DRAW; 5292 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 5293 } else { 5294 mPrivateFlags |= SKIP_DRAW; 5295 } 5296 } else { 5297 mPrivateFlags &= ~SKIP_DRAW; 5298 } 5299 requestLayout(); 5300 invalidate(); 5301 } 5302 5303 if ((changed & KEEP_SCREEN_ON) != 0) { 5304 if (mParent != null) { 5305 mParent.recomputeViewAttributes(this); 5306 } 5307 } 5308 } 5309 5310 /** 5311 * Change the view's z order in the tree, so it's on top of other sibling 5312 * views 5313 */ 5314 public void bringToFront() { 5315 if (mParent != null) { 5316 mParent.bringChildToFront(this); 5317 } 5318 } 5319 5320 /** 5321 * This is called in response to an internal scroll in this view (i.e., the 5322 * view scrolled its own contents). This is typically as a result of 5323 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 5324 * called. 5325 * 5326 * @param l Current horizontal scroll origin. 5327 * @param t Current vertical scroll origin. 5328 * @param oldl Previous horizontal scroll origin. 5329 * @param oldt Previous vertical scroll origin. 5330 */ 5331 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 5332 mBackgroundSizeChanged = true; 5333 5334 final AttachInfo ai = mAttachInfo; 5335 if (ai != null) { 5336 ai.mViewScrollChanged = true; 5337 } 5338 } 5339 5340 /** 5341 * Interface definition for a callback to be invoked when the layout bounds of a view 5342 * changes due to layout processing. 5343 */ 5344 public interface OnLayoutChangeListener { 5345 /** 5346 * Called when the focus state of a view has changed. 5347 * 5348 * @param v The view whose state has changed. 5349 * @param left The new value of the view's left property. 5350 * @param top The new value of the view's top property. 5351 * @param right The new value of the view's right property. 5352 * @param bottom The new value of the view's bottom property. 5353 * @param oldLeft The previous value of the view's left property. 5354 * @param oldTop The previous value of the view's top property. 5355 * @param oldRight The previous value of the view's right property. 5356 * @param oldBottom The previous value of the view's bottom property. 5357 */ 5358 void onLayoutChange(View v, int left, int top, int right, int bottom, 5359 int oldLeft, int oldTop, int oldRight, int oldBottom); 5360 } 5361 5362 /** 5363 * This is called during layout when the size of this view has changed. If 5364 * you were just added to the view hierarchy, you're called with the old 5365 * values of 0. 5366 * 5367 * @param w Current width of this view. 5368 * @param h Current height of this view. 5369 * @param oldw Old width of this view. 5370 * @param oldh Old height of this view. 5371 */ 5372 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5373 } 5374 5375 /** 5376 * Called by draw to draw the child views. This may be overridden 5377 * by derived classes to gain control just before its children are drawn 5378 * (but after its own view has been drawn). 5379 * @param canvas the canvas on which to draw the view 5380 */ 5381 protected void dispatchDraw(Canvas canvas) { 5382 } 5383 5384 /** 5385 * Gets the parent of this view. Note that the parent is a 5386 * ViewParent and not necessarily a View. 5387 * 5388 * @return Parent of this view. 5389 */ 5390 public final ViewParent getParent() { 5391 return mParent; 5392 } 5393 5394 /** 5395 * Return the scrolled left position of this view. This is the left edge of 5396 * the displayed part of your view. You do not need to draw any pixels 5397 * farther left, since those are outside of the frame of your view on 5398 * screen. 5399 * 5400 * @return The left edge of the displayed part of your view, in pixels. 5401 */ 5402 public final int getScrollX() { 5403 return mScrollX; 5404 } 5405 5406 /** 5407 * Return the scrolled top position of this view. This is the top edge of 5408 * the displayed part of your view. You do not need to draw any pixels above 5409 * it, since those are outside of the frame of your view on screen. 5410 * 5411 * @return The top edge of the displayed part of your view, in pixels. 5412 */ 5413 public final int getScrollY() { 5414 return mScrollY; 5415 } 5416 5417 /** 5418 * Return the width of the your view. 5419 * 5420 * @return The width of your view, in pixels. 5421 */ 5422 @ViewDebug.ExportedProperty(category = "layout") 5423 public final int getWidth() { 5424 return mRight - mLeft; 5425 } 5426 5427 /** 5428 * Return the height of your view. 5429 * 5430 * @return The height of your view, in pixels. 5431 */ 5432 @ViewDebug.ExportedProperty(category = "layout") 5433 public final int getHeight() { 5434 return mBottom - mTop; 5435 } 5436 5437 /** 5438 * Return the visible drawing bounds of your view. Fills in the output 5439 * rectangle with the values from getScrollX(), getScrollY(), 5440 * getWidth(), and getHeight(). 5441 * 5442 * @param outRect The (scrolled) drawing bounds of the view. 5443 */ 5444 public void getDrawingRect(Rect outRect) { 5445 outRect.left = mScrollX; 5446 outRect.top = mScrollY; 5447 outRect.right = mScrollX + (mRight - mLeft); 5448 outRect.bottom = mScrollY + (mBottom - mTop); 5449 } 5450 5451 /** 5452 * Like {@link #getMeasuredWidthAndState()}, but only returns the 5453 * raw width component (that is the result is masked by 5454 * {@link #MEASURED_SIZE_MASK}). 5455 * 5456 * @return The raw measured width of this view. 5457 */ 5458 public final int getMeasuredWidth() { 5459 return mMeasuredWidth & MEASURED_SIZE_MASK; 5460 } 5461 5462 /** 5463 * Return the full width measurement information for this view as computed 5464 * by the most recent call to {@link #measure}. This result is a bit mask 5465 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5466 * This should be used during measurement and layout calculations only. Use 5467 * {@link #getWidth()} to see how wide a view is after layout. 5468 * 5469 * @return The measured width of this view as a bit mask. 5470 */ 5471 public final int getMeasuredWidthAndState() { 5472 return mMeasuredWidth; 5473 } 5474 5475 /** 5476 * Like {@link #getMeasuredHeightAndState()}, but only returns the 5477 * raw width component (that is the result is masked by 5478 * {@link #MEASURED_SIZE_MASK}). 5479 * 5480 * @return The raw measured height of this view. 5481 */ 5482 public final int getMeasuredHeight() { 5483 return mMeasuredHeight & MEASURED_SIZE_MASK; 5484 } 5485 5486 /** 5487 * Return the full height measurement information for this view as computed 5488 * by the most recent call to {@link #measure}. This result is a bit mask 5489 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5490 * This should be used during measurement and layout calculations only. Use 5491 * {@link #getHeight()} to see how wide a view is after layout. 5492 * 5493 * @return The measured width of this view as a bit mask. 5494 */ 5495 public final int getMeasuredHeightAndState() { 5496 return mMeasuredHeight; 5497 } 5498 5499 /** 5500 * Return only the state bits of {@link #getMeasuredWidthAndState()} 5501 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 5502 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 5503 * and the height component is at the shifted bits 5504 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 5505 */ 5506 public final int getMeasuredState() { 5507 return (mMeasuredWidth&MEASURED_STATE_MASK) 5508 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 5509 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 5510 } 5511 5512 /** 5513 * The transform matrix of this view, which is calculated based on the current 5514 * roation, scale, and pivot properties. 5515 * 5516 * @see #getRotation() 5517 * @see #getScaleX() 5518 * @see #getScaleY() 5519 * @see #getPivotX() 5520 * @see #getPivotY() 5521 * @return The current transform matrix for the view 5522 */ 5523 public Matrix getMatrix() { 5524 updateMatrix(); 5525 return mMatrix; 5526 } 5527 5528 /** 5529 * Utility function to determine if the value is far enough away from zero to be 5530 * considered non-zero. 5531 * @param value A floating point value to check for zero-ness 5532 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5533 */ 5534 private static boolean nonzero(float value) { 5535 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5536 } 5537 5538 /** 5539 * Returns true if the transform matrix is the identity matrix. 5540 * Recomputes the matrix if necessary. 5541 * 5542 * @return True if the transform matrix is the identity matrix, false otherwise. 5543 */ 5544 final boolean hasIdentityMatrix() { 5545 updateMatrix(); 5546 return mMatrixIsIdentity; 5547 } 5548 5549 /** 5550 * Recomputes the transform matrix if necessary. 5551 */ 5552 private void updateMatrix() { 5553 if (mMatrixDirty) { 5554 // transform-related properties have changed since the last time someone 5555 // asked for the matrix; recalculate it with the current values 5556 5557 // Figure out if we need to update the pivot point 5558 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5559 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 5560 mPrevWidth = mRight - mLeft; 5561 mPrevHeight = mBottom - mTop; 5562 mPivotX = mPrevWidth / 2f; 5563 mPivotY = mPrevHeight / 2f; 5564 } 5565 } 5566 mMatrix.reset(); 5567 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5568 mMatrix.setTranslate(mTranslationX, mTranslationY); 5569 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5570 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5571 } else { 5572 if (mCamera == null) { 5573 mCamera = new Camera(); 5574 matrix3D = new Matrix(); 5575 } 5576 mCamera.save(); 5577 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5578 mCamera.rotateX(mRotationX); 5579 mCamera.rotateY(mRotationY); 5580 mCamera.rotateZ(-mRotation); 5581 mCamera.getMatrix(matrix3D); 5582 matrix3D.preTranslate(-mPivotX, -mPivotY); 5583 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5584 mMatrix.postConcat(matrix3D); 5585 mCamera.restore(); 5586 } 5587 mMatrixDirty = false; 5588 mMatrixIsIdentity = mMatrix.isIdentity(); 5589 mInverseMatrixDirty = true; 5590 } 5591 } 5592 5593 /** 5594 * Utility method to retrieve the inverse of the current mMatrix property. 5595 * We cache the matrix to avoid recalculating it when transform properties 5596 * have not changed. 5597 * 5598 * @return The inverse of the current matrix of this view. 5599 */ 5600 final Matrix getInverseMatrix() { 5601 updateMatrix(); 5602 if (mInverseMatrixDirty) { 5603 if (mInverseMatrix == null) { 5604 mInverseMatrix = new Matrix(); 5605 } 5606 mMatrix.invert(mInverseMatrix); 5607 mInverseMatrixDirty = false; 5608 } 5609 return mInverseMatrix; 5610 } 5611 5612 /** 5613 * The degrees that the view is rotated around the pivot point. 5614 * 5615 * @see #getPivotX() 5616 * @see #getPivotY() 5617 * @return The degrees of rotation. 5618 */ 5619 public float getRotation() { 5620 return mRotation; 5621 } 5622 5623 /** 5624 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5625 * result in clockwise rotation. 5626 * 5627 * @param rotation The degrees of rotation. 5628 * @see #getPivotX() 5629 * @see #getPivotY() 5630 * 5631 * @attr ref android.R.styleable#View_rotation 5632 */ 5633 public void setRotation(float rotation) { 5634 if (mRotation != rotation) { 5635 // Double-invalidation is necessary to capture view's old and new areas 5636 invalidate(false); 5637 mRotation = rotation; 5638 mMatrixDirty = true; 5639 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5640 invalidate(false); 5641 } 5642 } 5643 5644 /** 5645 * The degrees that the view is rotated around the vertical axis through the pivot point. 5646 * 5647 * @see #getPivotX() 5648 * @see #getPivotY() 5649 * @return The degrees of Y rotation. 5650 */ 5651 public float getRotationY() { 5652 return mRotationY; 5653 } 5654 5655 /** 5656 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5657 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5658 * down the y axis. 5659 * 5660 * @param rotationY The degrees of Y rotation. 5661 * @see #getPivotX() 5662 * @see #getPivotY() 5663 * 5664 * @attr ref android.R.styleable#View_rotationY 5665 */ 5666 public void setRotationY(float rotationY) { 5667 if (mRotationY != rotationY) { 5668 // Double-invalidation is necessary to capture view's old and new areas 5669 invalidate(false); 5670 mRotationY = rotationY; 5671 mMatrixDirty = true; 5672 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5673 invalidate(false); 5674 } 5675 } 5676 5677 /** 5678 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5679 * 5680 * @see #getPivotX() 5681 * @see #getPivotY() 5682 * @return The degrees of X rotation. 5683 */ 5684 public float getRotationX() { 5685 return mRotationX; 5686 } 5687 5688 /** 5689 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 5690 * Increasing values result in clockwise rotation from the viewpoint of looking down the 5691 * x axis. 5692 * 5693 * @param rotationX The degrees of X rotation. 5694 * @see #getPivotX() 5695 * @see #getPivotY() 5696 * 5697 * @attr ref android.R.styleable#View_rotationX 5698 */ 5699 public void setRotationX(float rotationX) { 5700 if (mRotationX != rotationX) { 5701 // Double-invalidation is necessary to capture view's old and new areas 5702 invalidate(false); 5703 mRotationX = rotationX; 5704 mMatrixDirty = true; 5705 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5706 invalidate(false); 5707 } 5708 } 5709 5710 /** 5711 * The amount that the view is scaled in x around the pivot point, as a proportion of 5712 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 5713 * 5714 * <p>By default, this is 1.0f. 5715 * 5716 * @see #getPivotX() 5717 * @see #getPivotY() 5718 * @return The scaling factor. 5719 */ 5720 public float getScaleX() { 5721 return mScaleX; 5722 } 5723 5724 /** 5725 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 5726 * the view's unscaled width. A value of 1 means that no scaling is applied. 5727 * 5728 * @param scaleX The scaling factor. 5729 * @see #getPivotX() 5730 * @see #getPivotY() 5731 * 5732 * @attr ref android.R.styleable#View_scaleX 5733 */ 5734 public void setScaleX(float scaleX) { 5735 if (mScaleX != scaleX) { 5736 // Double-invalidation is necessary to capture view's old and new areas 5737 invalidate(false); 5738 mScaleX = scaleX; 5739 mMatrixDirty = true; 5740 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5741 invalidate(false); 5742 } 5743 } 5744 5745 /** 5746 * The amount that the view is scaled in y around the pivot point, as a proportion of 5747 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 5748 * 5749 * <p>By default, this is 1.0f. 5750 * 5751 * @see #getPivotX() 5752 * @see #getPivotY() 5753 * @return The scaling factor. 5754 */ 5755 public float getScaleY() { 5756 return mScaleY; 5757 } 5758 5759 /** 5760 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 5761 * the view's unscaled width. A value of 1 means that no scaling is applied. 5762 * 5763 * @param scaleY The scaling factor. 5764 * @see #getPivotX() 5765 * @see #getPivotY() 5766 * 5767 * @attr ref android.R.styleable#View_scaleY 5768 */ 5769 public void setScaleY(float scaleY) { 5770 if (mScaleY != scaleY) { 5771 // Double-invalidation is necessary to capture view's old and new areas 5772 invalidate(false); 5773 mScaleY = scaleY; 5774 mMatrixDirty = true; 5775 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5776 invalidate(false); 5777 } 5778 } 5779 5780 /** 5781 * The x location of the point around which the view is {@link #setRotation(float) rotated} 5782 * and {@link #setScaleX(float) scaled}. 5783 * 5784 * @see #getRotation() 5785 * @see #getScaleX() 5786 * @see #getScaleY() 5787 * @see #getPivotY() 5788 * @return The x location of the pivot point. 5789 */ 5790 public float getPivotX() { 5791 return mPivotX; 5792 } 5793 5794 /** 5795 * Sets the x location of the point around which the view is 5796 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 5797 * By default, the pivot point is centered on the object. 5798 * Setting this property disables this behavior and causes the view to use only the 5799 * explicitly set pivotX and pivotY values. 5800 * 5801 * @param pivotX The x location of the pivot point. 5802 * @see #getRotation() 5803 * @see #getScaleX() 5804 * @see #getScaleY() 5805 * @see #getPivotY() 5806 * 5807 * @attr ref android.R.styleable#View_transformPivotX 5808 */ 5809 public void setPivotX(float pivotX) { 5810 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5811 if (mPivotX != pivotX) { 5812 // Double-invalidation is necessary to capture view's old and new areas 5813 invalidate(false); 5814 mPivotX = pivotX; 5815 mMatrixDirty = true; 5816 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5817 invalidate(false); 5818 } 5819 } 5820 5821 /** 5822 * The y location of the point around which the view is {@link #setRotation(float) rotated} 5823 * and {@link #setScaleY(float) scaled}. 5824 * 5825 * @see #getRotation() 5826 * @see #getScaleX() 5827 * @see #getScaleY() 5828 * @see #getPivotY() 5829 * @return The y location of the pivot point. 5830 */ 5831 public float getPivotY() { 5832 return mPivotY; 5833 } 5834 5835 /** 5836 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 5837 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 5838 * Setting this property disables this behavior and causes the view to use only the 5839 * explicitly set pivotX and pivotY values. 5840 * 5841 * @param pivotY The y location of the pivot point. 5842 * @see #getRotation() 5843 * @see #getScaleX() 5844 * @see #getScaleY() 5845 * @see #getPivotY() 5846 * 5847 * @attr ref android.R.styleable#View_transformPivotY 5848 */ 5849 public void setPivotY(float pivotY) { 5850 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5851 if (mPivotY != pivotY) { 5852 // Double-invalidation is necessary to capture view's old and new areas 5853 invalidate(false); 5854 mPivotY = pivotY; 5855 mMatrixDirty = true; 5856 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5857 invalidate(false); 5858 } 5859 } 5860 5861 /** 5862 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 5863 * completely transparent and 1 means the view is completely opaque. 5864 * 5865 * <p>By default this is 1.0f. 5866 * @return The opacity of the view. 5867 */ 5868 public float getAlpha() { 5869 return mAlpha; 5870 } 5871 5872 /** 5873 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 5874 * completely transparent and 1 means the view is completely opaque.</p> 5875 * 5876 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 5877 * responsible for applying the opacity itself. Otherwise, calling this method is 5878 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 5879 * setting a hardware layer.</p> 5880 * 5881 * @param alpha The opacity of the view. 5882 * 5883 * @see #setLayerType(int, android.graphics.Paint) 5884 * 5885 * @attr ref android.R.styleable#View_alpha 5886 */ 5887 public void setAlpha(float alpha) { 5888 mAlpha = alpha; 5889 if (onSetAlpha((int) (alpha * 255))) { 5890 mPrivateFlags |= ALPHA_SET; 5891 // subclass is handling alpha - don't optimize rendering cache invalidation 5892 invalidate(); 5893 } else { 5894 mPrivateFlags &= ~ALPHA_SET; 5895 invalidate(false); 5896 } 5897 } 5898 5899 /** 5900 * Top position of this view relative to its parent. 5901 * 5902 * @return The top of this view, in pixels. 5903 */ 5904 @ViewDebug.CapturedViewProperty 5905 public final int getTop() { 5906 return mTop; 5907 } 5908 5909 /** 5910 * Sets the top position of this view relative to its parent. This method is meant to be called 5911 * by the layout system and should not generally be called otherwise, because the property 5912 * may be changed at any time by the layout. 5913 * 5914 * @param top The top of this view, in pixels. 5915 */ 5916 public final void setTop(int top) { 5917 if (top != mTop) { 5918 updateMatrix(); 5919 if (mMatrixIsIdentity) { 5920 final ViewParent p = mParent; 5921 if (p != null && mAttachInfo != null) { 5922 final Rect r = mAttachInfo.mTmpInvalRect; 5923 int minTop; 5924 int yLoc; 5925 if (top < mTop) { 5926 minTop = top; 5927 yLoc = top - mTop; 5928 } else { 5929 minTop = mTop; 5930 yLoc = 0; 5931 } 5932 r.set(0, yLoc, mRight - mLeft, mBottom - minTop); 5933 p.invalidateChild(this, r); 5934 } 5935 } else { 5936 // Double-invalidation is necessary to capture view's old and new areas 5937 invalidate(); 5938 } 5939 5940 int width = mRight - mLeft; 5941 int oldHeight = mBottom - mTop; 5942 5943 mTop = top; 5944 5945 onSizeChanged(width, mBottom - mTop, width, oldHeight); 5946 5947 if (!mMatrixIsIdentity) { 5948 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5949 // A change in dimension means an auto-centered pivot point changes, too 5950 mMatrixDirty = true; 5951 } 5952 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5953 invalidate(); 5954 } 5955 mBackgroundSizeChanged = true; 5956 } 5957 } 5958 5959 /** 5960 * Bottom position of this view relative to its parent. 5961 * 5962 * @return The bottom of this view, in pixels. 5963 */ 5964 @ViewDebug.CapturedViewProperty 5965 public final int getBottom() { 5966 return mBottom; 5967 } 5968 5969 /** 5970 * True if this view has changed since the last time being drawn. 5971 * 5972 * @return The dirty state of this view. 5973 */ 5974 public boolean isDirty() { 5975 return (mPrivateFlags & DIRTY_MASK) != 0; 5976 } 5977 5978 /** 5979 * Sets the bottom position of this view relative to its parent. This method is meant to be 5980 * called by the layout system and should not generally be called otherwise, because the 5981 * property may be changed at any time by the layout. 5982 * 5983 * @param bottom The bottom of this view, in pixels. 5984 */ 5985 public final void setBottom(int bottom) { 5986 if (bottom != mBottom) { 5987 updateMatrix(); 5988 if (mMatrixIsIdentity) { 5989 final ViewParent p = mParent; 5990 if (p != null && mAttachInfo != null) { 5991 final Rect r = mAttachInfo.mTmpInvalRect; 5992 int maxBottom; 5993 if (bottom < mBottom) { 5994 maxBottom = mBottom; 5995 } else { 5996 maxBottom = bottom; 5997 } 5998 r.set(0, 0, mRight - mLeft, maxBottom - mTop); 5999 p.invalidateChild(this, r); 6000 } 6001 } else { 6002 // Double-invalidation is necessary to capture view's old and new areas 6003 invalidate(); 6004 } 6005 6006 int width = mRight - mLeft; 6007 int oldHeight = mBottom - mTop; 6008 6009 mBottom = bottom; 6010 6011 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6012 6013 if (!mMatrixIsIdentity) { 6014 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6015 // A change in dimension means an auto-centered pivot point changes, too 6016 mMatrixDirty = true; 6017 } 6018 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6019 invalidate(); 6020 } 6021 mBackgroundSizeChanged = true; 6022 } 6023 } 6024 6025 /** 6026 * Left position of this view relative to its parent. 6027 * 6028 * @return The left edge of this view, in pixels. 6029 */ 6030 @ViewDebug.CapturedViewProperty 6031 public final int getLeft() { 6032 return mLeft; 6033 } 6034 6035 /** 6036 * Sets the left position of this view relative to its parent. This method is meant to be called 6037 * by the layout system and should not generally be called otherwise, because the property 6038 * may be changed at any time by the layout. 6039 * 6040 * @param left The bottom of this view, in pixels. 6041 */ 6042 public final void setLeft(int left) { 6043 if (left != mLeft) { 6044 updateMatrix(); 6045 if (mMatrixIsIdentity) { 6046 final ViewParent p = mParent; 6047 if (p != null && mAttachInfo != null) { 6048 final Rect r = mAttachInfo.mTmpInvalRect; 6049 int minLeft; 6050 int xLoc; 6051 if (left < mLeft) { 6052 minLeft = left; 6053 xLoc = left - mLeft; 6054 } else { 6055 minLeft = mLeft; 6056 xLoc = 0; 6057 } 6058 r.set(xLoc, 0, mRight - minLeft, mBottom - mTop); 6059 p.invalidateChild(this, r); 6060 } 6061 } else { 6062 // Double-invalidation is necessary to capture view's old and new areas 6063 invalidate(); 6064 } 6065 6066 int oldWidth = mRight - mLeft; 6067 int height = mBottom - mTop; 6068 6069 mLeft = left; 6070 6071 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6072 6073 if (!mMatrixIsIdentity) { 6074 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6075 // A change in dimension means an auto-centered pivot point changes, too 6076 mMatrixDirty = true; 6077 } 6078 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6079 invalidate(); 6080 } 6081 mBackgroundSizeChanged = true; 6082 } 6083 } 6084 6085 /** 6086 * Right position of this view relative to its parent. 6087 * 6088 * @return The right edge of this view, in pixels. 6089 */ 6090 @ViewDebug.CapturedViewProperty 6091 public final int getRight() { 6092 return mRight; 6093 } 6094 6095 /** 6096 * Sets the right position of this view relative to its parent. This method is meant to be called 6097 * by the layout system and should not generally be called otherwise, because the property 6098 * may be changed at any time by the layout. 6099 * 6100 * @param right The bottom of this view, in pixels. 6101 */ 6102 public final void setRight(int right) { 6103 if (right != mRight) { 6104 updateMatrix(); 6105 if (mMatrixIsIdentity) { 6106 final ViewParent p = mParent; 6107 if (p != null && mAttachInfo != null) { 6108 final Rect r = mAttachInfo.mTmpInvalRect; 6109 int maxRight; 6110 if (right < mRight) { 6111 maxRight = mRight; 6112 } else { 6113 maxRight = right; 6114 } 6115 r.set(0, 0, maxRight - mLeft, mBottom - mTop); 6116 p.invalidateChild(this, r); 6117 } 6118 } else { 6119 // Double-invalidation is necessary to capture view's old and new areas 6120 invalidate(); 6121 } 6122 6123 int oldWidth = mRight - mLeft; 6124 int height = mBottom - mTop; 6125 6126 mRight = right; 6127 6128 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6129 6130 if (!mMatrixIsIdentity) { 6131 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6132 // A change in dimension means an auto-centered pivot point changes, too 6133 mMatrixDirty = true; 6134 } 6135 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6136 invalidate(); 6137 } 6138 mBackgroundSizeChanged = true; 6139 } 6140 } 6141 6142 /** 6143 * The visual x position of this view, in pixels. This is equivalent to the 6144 * {@link #setTranslationX(float) translationX} property plus the current 6145 * {@link #getLeft() left} property. 6146 * 6147 * @return The visual x position of this view, in pixels. 6148 */ 6149 public float getX() { 6150 return mLeft + mTranslationX; 6151 } 6152 6153 /** 6154 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 6155 * {@link #setTranslationX(float) translationX} property to be the difference between 6156 * the x value passed in and the current {@link #getLeft() left} property. 6157 * 6158 * @param x The visual x position of this view, in pixels. 6159 */ 6160 public void setX(float x) { 6161 setTranslationX(x - mLeft); 6162 } 6163 6164 /** 6165 * The visual y position of this view, in pixels. This is equivalent to the 6166 * {@link #setTranslationY(float) translationY} property plus the current 6167 * {@link #getTop() top} property. 6168 * 6169 * @return The visual y position of this view, in pixels. 6170 */ 6171 public float getY() { 6172 return mTop + mTranslationY; 6173 } 6174 6175 /** 6176 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 6177 * {@link #setTranslationY(float) translationY} property to be the difference between 6178 * the y value passed in and the current {@link #getTop() top} property. 6179 * 6180 * @param y The visual y position of this view, in pixels. 6181 */ 6182 public void setY(float y) { 6183 setTranslationY(y - mTop); 6184 } 6185 6186 6187 /** 6188 * The horizontal location of this view relative to its {@link #getLeft() left} position. 6189 * This position is post-layout, in addition to wherever the object's 6190 * layout placed it. 6191 * 6192 * @return The horizontal position of this view relative to its left position, in pixels. 6193 */ 6194 public float getTranslationX() { 6195 return mTranslationX; 6196 } 6197 6198 /** 6199 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 6200 * This effectively positions the object post-layout, in addition to wherever the object's 6201 * layout placed it. 6202 * 6203 * @param translationX The horizontal position of this view relative to its left position, 6204 * in pixels. 6205 * 6206 * @attr ref android.R.styleable#View_translationX 6207 */ 6208 public void setTranslationX(float translationX) { 6209 if (mTranslationX != translationX) { 6210 // Double-invalidation is necessary to capture view's old and new areas 6211 invalidate(false); 6212 mTranslationX = translationX; 6213 mMatrixDirty = true; 6214 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6215 invalidate(false); 6216 } 6217 } 6218 6219 /** 6220 * The horizontal location of this view relative to its {@link #getTop() top} position. 6221 * This position is post-layout, in addition to wherever the object's 6222 * layout placed it. 6223 * 6224 * @return The vertical position of this view relative to its top position, 6225 * in pixels. 6226 */ 6227 public float getTranslationY() { 6228 return mTranslationY; 6229 } 6230 6231 /** 6232 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 6233 * This effectively positions the object post-layout, in addition to wherever the object's 6234 * layout placed it. 6235 * 6236 * @param translationY The vertical position of this view relative to its top position, 6237 * in pixels. 6238 * 6239 * @attr ref android.R.styleable#View_translationY 6240 */ 6241 public void setTranslationY(float translationY) { 6242 if (mTranslationY != translationY) { 6243 // Double-invalidation is necessary to capture view's old and new areas 6244 invalidate(false); 6245 mTranslationY = translationY; 6246 mMatrixDirty = true; 6247 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6248 invalidate(false); 6249 } 6250 } 6251 6252 /** 6253 * Hit rectangle in parent's coordinates 6254 * 6255 * @param outRect The hit rectangle of the view. 6256 */ 6257 public void getHitRect(Rect outRect) { 6258 updateMatrix(); 6259 if (mMatrixIsIdentity || mAttachInfo == null) { 6260 outRect.set(mLeft, mTop, mRight, mBottom); 6261 } else { 6262 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 6263 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 6264 mMatrix.mapRect(tmpRect); 6265 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 6266 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 6267 } 6268 } 6269 6270 /** 6271 * Determines whether the given point, in local coordinates is inside the view. 6272 */ 6273 /*package*/ final boolean pointInView(float localX, float localY) { 6274 return localX >= 0 && localX < (mRight - mLeft) 6275 && localY >= 0 && localY < (mBottom - mTop); 6276 } 6277 6278 /** 6279 * Utility method to determine whether the given point, in local coordinates, 6280 * is inside the view, where the area of the view is expanded by the slop factor. 6281 * This method is called while processing touch-move events to determine if the event 6282 * is still within the view. 6283 */ 6284 private boolean pointInView(float localX, float localY, float slop) { 6285 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 6286 localY < ((mBottom - mTop) + slop); 6287 } 6288 6289 /** 6290 * When a view has focus and the user navigates away from it, the next view is searched for 6291 * starting from the rectangle filled in by this method. 6292 * 6293 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 6294 * view maintains some idea of internal selection, such as a cursor, or a selected row 6295 * or column, you should override this method and fill in a more specific rectangle. 6296 * 6297 * @param r The rectangle to fill in, in this view's coordinates. 6298 */ 6299 public void getFocusedRect(Rect r) { 6300 getDrawingRect(r); 6301 } 6302 6303 /** 6304 * If some part of this view is not clipped by any of its parents, then 6305 * return that area in r in global (root) coordinates. To convert r to local 6306 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 6307 * -globalOffset.y)) If the view is completely clipped or translated out, 6308 * return false. 6309 * 6310 * @param r If true is returned, r holds the global coordinates of the 6311 * visible portion of this view. 6312 * @param globalOffset If true is returned, globalOffset holds the dx,dy 6313 * between this view and its root. globalOffet may be null. 6314 * @return true if r is non-empty (i.e. part of the view is visible at the 6315 * root level. 6316 */ 6317 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 6318 int width = mRight - mLeft; 6319 int height = mBottom - mTop; 6320 if (width > 0 && height > 0) { 6321 r.set(0, 0, width, height); 6322 if (globalOffset != null) { 6323 globalOffset.set(-mScrollX, -mScrollY); 6324 } 6325 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 6326 } 6327 return false; 6328 } 6329 6330 public final boolean getGlobalVisibleRect(Rect r) { 6331 return getGlobalVisibleRect(r, null); 6332 } 6333 6334 public final boolean getLocalVisibleRect(Rect r) { 6335 Point offset = new Point(); 6336 if (getGlobalVisibleRect(r, offset)) { 6337 r.offset(-offset.x, -offset.y); // make r local 6338 return true; 6339 } 6340 return false; 6341 } 6342 6343 /** 6344 * Offset this view's vertical location by the specified number of pixels. 6345 * 6346 * @param offset the number of pixels to offset the view by 6347 */ 6348 public void offsetTopAndBottom(int offset) { 6349 if (offset != 0) { 6350 updateMatrix(); 6351 if (mMatrixIsIdentity) { 6352 final ViewParent p = mParent; 6353 if (p != null && mAttachInfo != null) { 6354 final Rect r = mAttachInfo.mTmpInvalRect; 6355 int minTop; 6356 int maxBottom; 6357 int yLoc; 6358 if (offset < 0) { 6359 minTop = mTop + offset; 6360 maxBottom = mBottom; 6361 yLoc = offset; 6362 } else { 6363 minTop = mTop; 6364 maxBottom = mBottom + offset; 6365 yLoc = 0; 6366 } 6367 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 6368 p.invalidateChild(this, r); 6369 } 6370 } else { 6371 invalidate(false); 6372 } 6373 6374 mTop += offset; 6375 mBottom += offset; 6376 6377 if (!mMatrixIsIdentity) { 6378 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6379 invalidate(false); 6380 } 6381 } 6382 } 6383 6384 /** 6385 * Offset this view's horizontal location by the specified amount of pixels. 6386 * 6387 * @param offset the numer of pixels to offset the view by 6388 */ 6389 public void offsetLeftAndRight(int offset) { 6390 if (offset != 0) { 6391 updateMatrix(); 6392 if (mMatrixIsIdentity) { 6393 final ViewParent p = mParent; 6394 if (p != null && mAttachInfo != null) { 6395 final Rect r = mAttachInfo.mTmpInvalRect; 6396 int minLeft; 6397 int maxRight; 6398 if (offset < 0) { 6399 minLeft = mLeft + offset; 6400 maxRight = mRight; 6401 } else { 6402 minLeft = mLeft; 6403 maxRight = mRight + offset; 6404 } 6405 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 6406 p.invalidateChild(this, r); 6407 } 6408 } else { 6409 invalidate(false); 6410 } 6411 6412 mLeft += offset; 6413 mRight += offset; 6414 6415 if (!mMatrixIsIdentity) { 6416 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6417 invalidate(false); 6418 } 6419 } 6420 } 6421 6422 /** 6423 * Get the LayoutParams associated with this view. All views should have 6424 * layout parameters. These supply parameters to the <i>parent</i> of this 6425 * view specifying how it should be arranged. There are many subclasses of 6426 * ViewGroup.LayoutParams, and these correspond to the different subclasses 6427 * of ViewGroup that are responsible for arranging their children. 6428 * @return The LayoutParams associated with this view 6429 */ 6430 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 6431 public ViewGroup.LayoutParams getLayoutParams() { 6432 return mLayoutParams; 6433 } 6434 6435 /** 6436 * Set the layout parameters associated with this view. These supply 6437 * parameters to the <i>parent</i> of this view specifying how it should be 6438 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 6439 * correspond to the different subclasses of ViewGroup that are responsible 6440 * for arranging their children. 6441 * 6442 * @param params the layout parameters for this view 6443 */ 6444 public void setLayoutParams(ViewGroup.LayoutParams params) { 6445 if (params == null) { 6446 throw new NullPointerException("params == null"); 6447 } 6448 mLayoutParams = params; 6449 requestLayout(); 6450 } 6451 6452 /** 6453 * Set the scrolled position of your view. This will cause a call to 6454 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6455 * invalidated. 6456 * @param x the x position to scroll to 6457 * @param y the y position to scroll to 6458 */ 6459 public void scrollTo(int x, int y) { 6460 if (mScrollX != x || mScrollY != y) { 6461 int oldX = mScrollX; 6462 int oldY = mScrollY; 6463 mScrollX = x; 6464 mScrollY = y; 6465 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 6466 if (!awakenScrollBars()) { 6467 invalidate(); 6468 } 6469 } 6470 } 6471 6472 /** 6473 * Move the scrolled position of your view. This will cause a call to 6474 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6475 * invalidated. 6476 * @param x the amount of pixels to scroll by horizontally 6477 * @param y the amount of pixels to scroll by vertically 6478 */ 6479 public void scrollBy(int x, int y) { 6480 scrollTo(mScrollX + x, mScrollY + y); 6481 } 6482 6483 /** 6484 * <p>Trigger the scrollbars to draw. When invoked this method starts an 6485 * animation to fade the scrollbars out after a default delay. If a subclass 6486 * provides animated scrolling, the start delay should equal the duration 6487 * of the scrolling animation.</p> 6488 * 6489 * <p>The animation starts only if at least one of the scrollbars is 6490 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 6491 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6492 * this method returns true, and false otherwise. If the animation is 6493 * started, this method calls {@link #invalidate()}; in that case the 6494 * caller should not call {@link #invalidate()}.</p> 6495 * 6496 * <p>This method should be invoked every time a subclass directly updates 6497 * the scroll parameters.</p> 6498 * 6499 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6500 * and {@link #scrollTo(int, int)}.</p> 6501 * 6502 * @return true if the animation is played, false otherwise 6503 * 6504 * @see #awakenScrollBars(int) 6505 * @see #scrollBy(int, int) 6506 * @see #scrollTo(int, int) 6507 * @see #isHorizontalScrollBarEnabled() 6508 * @see #isVerticalScrollBarEnabled() 6509 * @see #setHorizontalScrollBarEnabled(boolean) 6510 * @see #setVerticalScrollBarEnabled(boolean) 6511 */ 6512 protected boolean awakenScrollBars() { 6513 return mScrollCache != null && 6514 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6515 } 6516 6517 /** 6518 * Trigger the scrollbars to draw. 6519 * This method differs from awakenScrollBars() only in its default duration. 6520 * initialAwakenScrollBars() will show the scroll bars for longer than 6521 * usual to give the user more of a chance to notice them. 6522 * 6523 * @return true if the animation is played, false otherwise. 6524 */ 6525 private boolean initialAwakenScrollBars() { 6526 return mScrollCache != null && 6527 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6528 } 6529 6530 /** 6531 * <p> 6532 * Trigger the scrollbars to draw. When invoked this method starts an 6533 * animation to fade the scrollbars out after a fixed delay. If a subclass 6534 * provides animated scrolling, the start delay should equal the duration of 6535 * the scrolling animation. 6536 * </p> 6537 * 6538 * <p> 6539 * The animation starts only if at least one of the scrollbars is enabled, 6540 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6541 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6542 * this method returns true, and false otherwise. If the animation is 6543 * started, this method calls {@link #invalidate()}; in that case the caller 6544 * should not call {@link #invalidate()}. 6545 * </p> 6546 * 6547 * <p> 6548 * This method should be invoked everytime a subclass directly updates the 6549 * scroll parameters. 6550 * </p> 6551 * 6552 * @param startDelay the delay, in milliseconds, after which the animation 6553 * should start; when the delay is 0, the animation starts 6554 * immediately 6555 * @return true if the animation is played, false otherwise 6556 * 6557 * @see #scrollBy(int, int) 6558 * @see #scrollTo(int, int) 6559 * @see #isHorizontalScrollBarEnabled() 6560 * @see #isVerticalScrollBarEnabled() 6561 * @see #setHorizontalScrollBarEnabled(boolean) 6562 * @see #setVerticalScrollBarEnabled(boolean) 6563 */ 6564 protected boolean awakenScrollBars(int startDelay) { 6565 return awakenScrollBars(startDelay, true); 6566 } 6567 6568 /** 6569 * <p> 6570 * Trigger the scrollbars to draw. When invoked this method starts an 6571 * animation to fade the scrollbars out after a fixed delay. If a subclass 6572 * provides animated scrolling, the start delay should equal the duration of 6573 * the scrolling animation. 6574 * </p> 6575 * 6576 * <p> 6577 * The animation starts only if at least one of the scrollbars is enabled, 6578 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6579 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6580 * this method returns true, and false otherwise. If the animation is 6581 * started, this method calls {@link #invalidate()} if the invalidate parameter 6582 * is set to true; in that case the caller 6583 * should not call {@link #invalidate()}. 6584 * </p> 6585 * 6586 * <p> 6587 * This method should be invoked everytime a subclass directly updates the 6588 * scroll parameters. 6589 * </p> 6590 * 6591 * @param startDelay the delay, in milliseconds, after which the animation 6592 * should start; when the delay is 0, the animation starts 6593 * immediately 6594 * 6595 * @param invalidate Wheter this method should call invalidate 6596 * 6597 * @return true if the animation is played, false otherwise 6598 * 6599 * @see #scrollBy(int, int) 6600 * @see #scrollTo(int, int) 6601 * @see #isHorizontalScrollBarEnabled() 6602 * @see #isVerticalScrollBarEnabled() 6603 * @see #setHorizontalScrollBarEnabled(boolean) 6604 * @see #setVerticalScrollBarEnabled(boolean) 6605 */ 6606 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 6607 final ScrollabilityCache scrollCache = mScrollCache; 6608 6609 if (scrollCache == null || !scrollCache.fadeScrollBars) { 6610 return false; 6611 } 6612 6613 if (scrollCache.scrollBar == null) { 6614 scrollCache.scrollBar = new ScrollBarDrawable(); 6615 } 6616 6617 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 6618 6619 if (invalidate) { 6620 // Invalidate to show the scrollbars 6621 invalidate(); 6622 } 6623 6624 if (scrollCache.state == ScrollabilityCache.OFF) { 6625 // FIXME: this is copied from WindowManagerService. 6626 // We should get this value from the system when it 6627 // is possible to do so. 6628 final int KEY_REPEAT_FIRST_DELAY = 750; 6629 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 6630 } 6631 6632 // Tell mScrollCache when we should start fading. This may 6633 // extend the fade start time if one was already scheduled 6634 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 6635 scrollCache.fadeStartTime = fadeStartTime; 6636 scrollCache.state = ScrollabilityCache.ON; 6637 6638 // Schedule our fader to run, unscheduling any old ones first 6639 if (mAttachInfo != null) { 6640 mAttachInfo.mHandler.removeCallbacks(scrollCache); 6641 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 6642 } 6643 6644 return true; 6645 } 6646 6647 return false; 6648 } 6649 6650 /** 6651 * Mark the the area defined by dirty as needing to be drawn. If the view is 6652 * visible, {@link #onDraw} will be called at some point in the future. 6653 * This must be called from a UI thread. To call from a non-UI thread, call 6654 * {@link #postInvalidate()}. 6655 * 6656 * WARNING: This method is destructive to dirty. 6657 * @param dirty the rectangle representing the bounds of the dirty region 6658 */ 6659 public void invalidate(Rect dirty) { 6660 if (ViewDebug.TRACE_HIERARCHY) { 6661 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6662 } 6663 6664 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6665 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6666 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6667 final ViewParent p = mParent; 6668 final AttachInfo ai = mAttachInfo; 6669 if (p != null && ai != null && ai.mHardwareAccelerated) { 6670 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6671 // with a null dirty rect, which tells the ViewRoot to redraw everything 6672 p.invalidateChild(this, null); 6673 return; 6674 } 6675 if (p != null && ai != null) { 6676 final int scrollX = mScrollX; 6677 final int scrollY = mScrollY; 6678 final Rect r = ai.mTmpInvalRect; 6679 r.set(dirty.left - scrollX, dirty.top - scrollY, 6680 dirty.right - scrollX, dirty.bottom - scrollY); 6681 mParent.invalidateChild(this, r); 6682 } 6683 } 6684 } 6685 6686 /** 6687 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 6688 * The coordinates of the dirty rect are relative to the view. 6689 * If the view is visible, {@link #onDraw} will be called at some point 6690 * in the future. This must be called from a UI thread. To call 6691 * from a non-UI thread, call {@link #postInvalidate()}. 6692 * @param l the left position of the dirty region 6693 * @param t the top position of the dirty region 6694 * @param r the right position of the dirty region 6695 * @param b the bottom position of the dirty region 6696 */ 6697 public void invalidate(int l, int t, int r, int b) { 6698 if (ViewDebug.TRACE_HIERARCHY) { 6699 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6700 } 6701 6702 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6703 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6704 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6705 final ViewParent p = mParent; 6706 final AttachInfo ai = mAttachInfo; 6707 if (p != null && ai != null && ai.mHardwareAccelerated) { 6708 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6709 // with a null dirty rect, which tells the ViewRoot to redraw everything 6710 p.invalidateChild(this, null); 6711 return; 6712 } 6713 if (p != null && ai != null && l < r && t < b) { 6714 final int scrollX = mScrollX; 6715 final int scrollY = mScrollY; 6716 final Rect tmpr = ai.mTmpInvalRect; 6717 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 6718 p.invalidateChild(this, tmpr); 6719 } 6720 } 6721 } 6722 6723 /** 6724 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 6725 * be called at some point in the future. This must be called from a 6726 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 6727 */ 6728 public void invalidate() { 6729 invalidate(true); 6730 } 6731 6732 /** 6733 * This is where the invalidate() work actually happens. A full invalidate() 6734 * causes the drawing cache to be invalidated, but this function can be called with 6735 * invalidateCache set to false to skip that invalidation step for cases that do not 6736 * need it (for example, a component that remains at the same dimensions with the same 6737 * content). 6738 * 6739 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 6740 * well. This is usually true for a full invalidate, but may be set to false if the 6741 * View's contents or dimensions have not changed. 6742 */ 6743 private void invalidate(boolean invalidateCache) { 6744 if (ViewDebug.TRACE_HIERARCHY) { 6745 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6746 } 6747 6748 boolean opaque = isOpaque(); 6749 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6750 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 6751 opaque != mLastIsOpaque) { 6752 mLastIsOpaque = opaque; 6753 mPrivateFlags &= ~DRAWN; 6754 if (invalidateCache) { 6755 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6756 } 6757 final AttachInfo ai = mAttachInfo; 6758 final ViewParent p = mParent; 6759 if (p != null && ai != null && ai.mHardwareAccelerated) { 6760 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6761 // with a null dirty rect, which tells the ViewRoot to redraw everything 6762 p.invalidateChild(this, null); 6763 return; 6764 } 6765 6766 if (p != null && ai != null) { 6767 final Rect r = ai.mTmpInvalRect; 6768 r.set(0, 0, mRight - mLeft, mBottom - mTop); 6769 // Don't call invalidate -- we don't want to internally scroll 6770 // our own bounds 6771 p.invalidateChild(this, r); 6772 } 6773 } 6774 } 6775 6776 /** 6777 * Indicates whether this View is opaque. An opaque View guarantees that it will 6778 * draw all the pixels overlapping its bounds using a fully opaque color. 6779 * 6780 * Subclasses of View should override this method whenever possible to indicate 6781 * whether an instance is opaque. Opaque Views are treated in a special way by 6782 * the View hierarchy, possibly allowing it to perform optimizations during 6783 * invalidate/draw passes. 6784 * 6785 * @return True if this View is guaranteed to be fully opaque, false otherwise. 6786 */ 6787 @ViewDebug.ExportedProperty(category = "drawing") 6788 public boolean isOpaque() { 6789 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 6790 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 6791 } 6792 6793 /** 6794 * @hide 6795 */ 6796 protected void computeOpaqueFlags() { 6797 // Opaque if: 6798 // - Has a background 6799 // - Background is opaque 6800 // - Doesn't have scrollbars or scrollbars are inside overlay 6801 6802 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 6803 mPrivateFlags |= OPAQUE_BACKGROUND; 6804 } else { 6805 mPrivateFlags &= ~OPAQUE_BACKGROUND; 6806 } 6807 6808 final int flags = mViewFlags; 6809 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 6810 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 6811 mPrivateFlags |= OPAQUE_SCROLLBARS; 6812 } else { 6813 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 6814 } 6815 } 6816 6817 /** 6818 * @hide 6819 */ 6820 protected boolean hasOpaqueScrollbars() { 6821 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 6822 } 6823 6824 /** 6825 * @return A handler associated with the thread running the View. This 6826 * handler can be used to pump events in the UI events queue. 6827 */ 6828 public Handler getHandler() { 6829 if (mAttachInfo != null) { 6830 return mAttachInfo.mHandler; 6831 } 6832 return null; 6833 } 6834 6835 /** 6836 * Causes the Runnable to be added to the message queue. 6837 * The runnable will be run on the user interface thread. 6838 * 6839 * @param action The Runnable that will be executed. 6840 * 6841 * @return Returns true if the Runnable was successfully placed in to the 6842 * message queue. Returns false on failure, usually because the 6843 * looper processing the message queue is exiting. 6844 */ 6845 public boolean post(Runnable action) { 6846 Handler handler; 6847 if (mAttachInfo != null) { 6848 handler = mAttachInfo.mHandler; 6849 } else { 6850 // Assume that post will succeed later 6851 ViewRoot.getRunQueue().post(action); 6852 return true; 6853 } 6854 6855 return handler.post(action); 6856 } 6857 6858 /** 6859 * Causes the Runnable to be added to the message queue, to be run 6860 * after the specified amount of time elapses. 6861 * The runnable will be run on the user interface thread. 6862 * 6863 * @param action The Runnable that will be executed. 6864 * @param delayMillis The delay (in milliseconds) until the Runnable 6865 * will be executed. 6866 * 6867 * @return true if the Runnable was successfully placed in to the 6868 * message queue. Returns false on failure, usually because the 6869 * looper processing the message queue is exiting. Note that a 6870 * result of true does not mean the Runnable will be processed -- 6871 * if the looper is quit before the delivery time of the message 6872 * occurs then the message will be dropped. 6873 */ 6874 public boolean postDelayed(Runnable action, long delayMillis) { 6875 Handler handler; 6876 if (mAttachInfo != null) { 6877 handler = mAttachInfo.mHandler; 6878 } else { 6879 // Assume that post will succeed later 6880 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 6881 return true; 6882 } 6883 6884 return handler.postDelayed(action, delayMillis); 6885 } 6886 6887 /** 6888 * Removes the specified Runnable from the message queue. 6889 * 6890 * @param action The Runnable to remove from the message handling queue 6891 * 6892 * @return true if this view could ask the Handler to remove the Runnable, 6893 * false otherwise. When the returned value is true, the Runnable 6894 * may or may not have been actually removed from the message queue 6895 * (for instance, if the Runnable was not in the queue already.) 6896 */ 6897 public boolean removeCallbacks(Runnable action) { 6898 Handler handler; 6899 if (mAttachInfo != null) { 6900 handler = mAttachInfo.mHandler; 6901 } else { 6902 // Assume that post will succeed later 6903 ViewRoot.getRunQueue().removeCallbacks(action); 6904 return true; 6905 } 6906 6907 handler.removeCallbacks(action); 6908 return true; 6909 } 6910 6911 /** 6912 * Cause an invalidate to happen on a subsequent cycle through the event loop. 6913 * Use this to invalidate the View from a non-UI thread. 6914 * 6915 * @see #invalidate() 6916 */ 6917 public void postInvalidate() { 6918 postInvalidateDelayed(0); 6919 } 6920 6921 /** 6922 * Cause an invalidate of the specified area to happen on a subsequent cycle 6923 * through the event loop. Use this to invalidate the View from a non-UI thread. 6924 * 6925 * @param left The left coordinate of the rectangle to invalidate. 6926 * @param top The top coordinate of the rectangle to invalidate. 6927 * @param right The right coordinate of the rectangle to invalidate. 6928 * @param bottom The bottom coordinate of the rectangle to invalidate. 6929 * 6930 * @see #invalidate(int, int, int, int) 6931 * @see #invalidate(Rect) 6932 */ 6933 public void postInvalidate(int left, int top, int right, int bottom) { 6934 postInvalidateDelayed(0, left, top, right, bottom); 6935 } 6936 6937 /** 6938 * Cause an invalidate to happen on a subsequent cycle through the event 6939 * loop. Waits for the specified amount of time. 6940 * 6941 * @param delayMilliseconds the duration in milliseconds to delay the 6942 * invalidation by 6943 */ 6944 public void postInvalidateDelayed(long delayMilliseconds) { 6945 // We try only with the AttachInfo because there's no point in invalidating 6946 // if we are not attached to our window 6947 if (mAttachInfo != null) { 6948 Message msg = Message.obtain(); 6949 msg.what = AttachInfo.INVALIDATE_MSG; 6950 msg.obj = this; 6951 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6952 } 6953 } 6954 6955 /** 6956 * Cause an invalidate of the specified area to happen on a subsequent cycle 6957 * through the event loop. Waits for the specified amount of time. 6958 * 6959 * @param delayMilliseconds the duration in milliseconds to delay the 6960 * invalidation by 6961 * @param left The left coordinate of the rectangle to invalidate. 6962 * @param top The top coordinate of the rectangle to invalidate. 6963 * @param right The right coordinate of the rectangle to invalidate. 6964 * @param bottom The bottom coordinate of the rectangle to invalidate. 6965 */ 6966 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 6967 int right, int bottom) { 6968 6969 // We try only with the AttachInfo because there's no point in invalidating 6970 // if we are not attached to our window 6971 if (mAttachInfo != null) { 6972 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 6973 info.target = this; 6974 info.left = left; 6975 info.top = top; 6976 info.right = right; 6977 info.bottom = bottom; 6978 6979 final Message msg = Message.obtain(); 6980 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 6981 msg.obj = info; 6982 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6983 } 6984 } 6985 6986 /** 6987 * Called by a parent to request that a child update its values for mScrollX 6988 * and mScrollY if necessary. This will typically be done if the child is 6989 * animating a scroll using a {@link android.widget.Scroller Scroller} 6990 * object. 6991 */ 6992 public void computeScroll() { 6993 } 6994 6995 /** 6996 * <p>Indicate whether the horizontal edges are faded when the view is 6997 * scrolled horizontally.</p> 6998 * 6999 * @return true if the horizontal edges should are faded on scroll, false 7000 * otherwise 7001 * 7002 * @see #setHorizontalFadingEdgeEnabled(boolean) 7003 * @attr ref android.R.styleable#View_fadingEdge 7004 */ 7005 public boolean isHorizontalFadingEdgeEnabled() { 7006 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 7007 } 7008 7009 /** 7010 * <p>Define whether the horizontal edges should be faded when this view 7011 * is scrolled horizontally.</p> 7012 * 7013 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 7014 * be faded when the view is scrolled 7015 * horizontally 7016 * 7017 * @see #isHorizontalFadingEdgeEnabled() 7018 * @attr ref android.R.styleable#View_fadingEdge 7019 */ 7020 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 7021 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 7022 if (horizontalFadingEdgeEnabled) { 7023 initScrollCache(); 7024 } 7025 7026 mViewFlags ^= FADING_EDGE_HORIZONTAL; 7027 } 7028 } 7029 7030 /** 7031 * <p>Indicate whether the vertical edges are faded when the view is 7032 * scrolled horizontally.</p> 7033 * 7034 * @return true if the vertical edges should are faded on scroll, false 7035 * otherwise 7036 * 7037 * @see #setVerticalFadingEdgeEnabled(boolean) 7038 * @attr ref android.R.styleable#View_fadingEdge 7039 */ 7040 public boolean isVerticalFadingEdgeEnabled() { 7041 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 7042 } 7043 7044 /** 7045 * <p>Define whether the vertical edges should be faded when this view 7046 * is scrolled vertically.</p> 7047 * 7048 * @param verticalFadingEdgeEnabled true if the vertical edges should 7049 * be faded when the view is scrolled 7050 * vertically 7051 * 7052 * @see #isVerticalFadingEdgeEnabled() 7053 * @attr ref android.R.styleable#View_fadingEdge 7054 */ 7055 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 7056 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 7057 if (verticalFadingEdgeEnabled) { 7058 initScrollCache(); 7059 } 7060 7061 mViewFlags ^= FADING_EDGE_VERTICAL; 7062 } 7063 } 7064 7065 /** 7066 * Returns the strength, or intensity, of the top faded edge. The strength is 7067 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7068 * returns 0.0 or 1.0 but no value in between. 7069 * 7070 * Subclasses should override this method to provide a smoother fade transition 7071 * when scrolling occurs. 7072 * 7073 * @return the intensity of the top fade as a float between 0.0f and 1.0f 7074 */ 7075 protected float getTopFadingEdgeStrength() { 7076 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 7077 } 7078 7079 /** 7080 * Returns the strength, or intensity, of the bottom faded edge. The strength is 7081 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7082 * returns 0.0 or 1.0 but no value in between. 7083 * 7084 * Subclasses should override this method to provide a smoother fade transition 7085 * when scrolling occurs. 7086 * 7087 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 7088 */ 7089 protected float getBottomFadingEdgeStrength() { 7090 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 7091 computeVerticalScrollRange() ? 1.0f : 0.0f; 7092 } 7093 7094 /** 7095 * Returns the strength, or intensity, of the left faded edge. The strength is 7096 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7097 * returns 0.0 or 1.0 but no value in between. 7098 * 7099 * Subclasses should override this method to provide a smoother fade transition 7100 * when scrolling occurs. 7101 * 7102 * @return the intensity of the left fade as a float between 0.0f and 1.0f 7103 */ 7104 protected float getLeftFadingEdgeStrength() { 7105 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 7106 } 7107 7108 /** 7109 * Returns the strength, or intensity, of the right faded edge. The strength is 7110 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7111 * returns 0.0 or 1.0 but no value in between. 7112 * 7113 * Subclasses should override this method to provide a smoother fade transition 7114 * when scrolling occurs. 7115 * 7116 * @return the intensity of the right fade as a float between 0.0f and 1.0f 7117 */ 7118 protected float getRightFadingEdgeStrength() { 7119 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 7120 computeHorizontalScrollRange() ? 1.0f : 0.0f; 7121 } 7122 7123 /** 7124 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 7125 * scrollbar is not drawn by default.</p> 7126 * 7127 * @return true if the horizontal scrollbar should be painted, false 7128 * otherwise 7129 * 7130 * @see #setHorizontalScrollBarEnabled(boolean) 7131 */ 7132 public boolean isHorizontalScrollBarEnabled() { 7133 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7134 } 7135 7136 /** 7137 * <p>Define whether the horizontal scrollbar should be drawn or not. The 7138 * scrollbar is not drawn by default.</p> 7139 * 7140 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 7141 * be painted 7142 * 7143 * @see #isHorizontalScrollBarEnabled() 7144 */ 7145 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 7146 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 7147 mViewFlags ^= SCROLLBARS_HORIZONTAL; 7148 computeOpaqueFlags(); 7149 recomputePadding(); 7150 } 7151 } 7152 7153 /** 7154 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 7155 * scrollbar is not drawn by default.</p> 7156 * 7157 * @return true if the vertical scrollbar should be painted, false 7158 * otherwise 7159 * 7160 * @see #setVerticalScrollBarEnabled(boolean) 7161 */ 7162 public boolean isVerticalScrollBarEnabled() { 7163 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 7164 } 7165 7166 /** 7167 * <p>Define whether the vertical scrollbar should be drawn or not. The 7168 * scrollbar is not drawn by default.</p> 7169 * 7170 * @param verticalScrollBarEnabled true if the vertical scrollbar should 7171 * be painted 7172 * 7173 * @see #isVerticalScrollBarEnabled() 7174 */ 7175 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 7176 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 7177 mViewFlags ^= SCROLLBARS_VERTICAL; 7178 computeOpaqueFlags(); 7179 recomputePadding(); 7180 } 7181 } 7182 7183 /** 7184 * @hide 7185 */ 7186 protected void recomputePadding() { 7187 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 7188 } 7189 7190 /** 7191 * Define whether scrollbars will fade when the view is not scrolling. 7192 * 7193 * @param fadeScrollbars wheter to enable fading 7194 * 7195 */ 7196 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 7197 initScrollCache(); 7198 final ScrollabilityCache scrollabilityCache = mScrollCache; 7199 scrollabilityCache.fadeScrollBars = fadeScrollbars; 7200 if (fadeScrollbars) { 7201 scrollabilityCache.state = ScrollabilityCache.OFF; 7202 } else { 7203 scrollabilityCache.state = ScrollabilityCache.ON; 7204 } 7205 } 7206 7207 /** 7208 * 7209 * Returns true if scrollbars will fade when this view is not scrolling 7210 * 7211 * @return true if scrollbar fading is enabled 7212 */ 7213 public boolean isScrollbarFadingEnabled() { 7214 return mScrollCache != null && mScrollCache.fadeScrollBars; 7215 } 7216 7217 /** 7218 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 7219 * inset. When inset, they add to the padding of the view. And the scrollbars 7220 * can be drawn inside the padding area or on the edge of the view. For example, 7221 * if a view has a background drawable and you want to draw the scrollbars 7222 * inside the padding specified by the drawable, you can use 7223 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 7224 * appear at the edge of the view, ignoring the padding, then you can use 7225 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 7226 * @param style the style of the scrollbars. Should be one of 7227 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 7228 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 7229 * @see #SCROLLBARS_INSIDE_OVERLAY 7230 * @see #SCROLLBARS_INSIDE_INSET 7231 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7232 * @see #SCROLLBARS_OUTSIDE_INSET 7233 */ 7234 public void setScrollBarStyle(int style) { 7235 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 7236 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 7237 computeOpaqueFlags(); 7238 recomputePadding(); 7239 } 7240 } 7241 7242 /** 7243 * <p>Returns the current scrollbar style.</p> 7244 * @return the current scrollbar style 7245 * @see #SCROLLBARS_INSIDE_OVERLAY 7246 * @see #SCROLLBARS_INSIDE_INSET 7247 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7248 * @see #SCROLLBARS_OUTSIDE_INSET 7249 */ 7250 public int getScrollBarStyle() { 7251 return mViewFlags & SCROLLBARS_STYLE_MASK; 7252 } 7253 7254 /** 7255 * <p>Compute the horizontal range that the horizontal scrollbar 7256 * represents.</p> 7257 * 7258 * <p>The range is expressed in arbitrary units that must be the same as the 7259 * units used by {@link #computeHorizontalScrollExtent()} and 7260 * {@link #computeHorizontalScrollOffset()}.</p> 7261 * 7262 * <p>The default range is the drawing width of this view.</p> 7263 * 7264 * @return the total horizontal range represented by the horizontal 7265 * scrollbar 7266 * 7267 * @see #computeHorizontalScrollExtent() 7268 * @see #computeHorizontalScrollOffset() 7269 * @see android.widget.ScrollBarDrawable 7270 */ 7271 protected int computeHorizontalScrollRange() { 7272 return getWidth(); 7273 } 7274 7275 /** 7276 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 7277 * within the horizontal range. This value is used to compute the position 7278 * of the thumb within the scrollbar's track.</p> 7279 * 7280 * <p>The range is expressed in arbitrary units that must be the same as the 7281 * units used by {@link #computeHorizontalScrollRange()} and 7282 * {@link #computeHorizontalScrollExtent()}.</p> 7283 * 7284 * <p>The default offset is the scroll offset of this view.</p> 7285 * 7286 * @return the horizontal offset of the scrollbar's thumb 7287 * 7288 * @see #computeHorizontalScrollRange() 7289 * @see #computeHorizontalScrollExtent() 7290 * @see android.widget.ScrollBarDrawable 7291 */ 7292 protected int computeHorizontalScrollOffset() { 7293 return mScrollX; 7294 } 7295 7296 /** 7297 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 7298 * within the horizontal range. This value is used to compute the length 7299 * of the thumb within the scrollbar's track.</p> 7300 * 7301 * <p>The range is expressed in arbitrary units that must be the same as the 7302 * units used by {@link #computeHorizontalScrollRange()} and 7303 * {@link #computeHorizontalScrollOffset()}.</p> 7304 * 7305 * <p>The default extent is the drawing width of this view.</p> 7306 * 7307 * @return the horizontal extent of the scrollbar's thumb 7308 * 7309 * @see #computeHorizontalScrollRange() 7310 * @see #computeHorizontalScrollOffset() 7311 * @see android.widget.ScrollBarDrawable 7312 */ 7313 protected int computeHorizontalScrollExtent() { 7314 return getWidth(); 7315 } 7316 7317 /** 7318 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 7319 * 7320 * <p>The range is expressed in arbitrary units that must be the same as the 7321 * units used by {@link #computeVerticalScrollExtent()} and 7322 * {@link #computeVerticalScrollOffset()}.</p> 7323 * 7324 * @return the total vertical range represented by the vertical scrollbar 7325 * 7326 * <p>The default range is the drawing height of this view.</p> 7327 * 7328 * @see #computeVerticalScrollExtent() 7329 * @see #computeVerticalScrollOffset() 7330 * @see android.widget.ScrollBarDrawable 7331 */ 7332 protected int computeVerticalScrollRange() { 7333 return getHeight(); 7334 } 7335 7336 /** 7337 * <p>Compute the vertical offset of the vertical scrollbar's thumb 7338 * within the horizontal range. This value is used to compute the position 7339 * of the thumb within the scrollbar's track.</p> 7340 * 7341 * <p>The range is expressed in arbitrary units that must be the same as the 7342 * units used by {@link #computeVerticalScrollRange()} and 7343 * {@link #computeVerticalScrollExtent()}.</p> 7344 * 7345 * <p>The default offset is the scroll offset of this view.</p> 7346 * 7347 * @return the vertical offset of the scrollbar's thumb 7348 * 7349 * @see #computeVerticalScrollRange() 7350 * @see #computeVerticalScrollExtent() 7351 * @see android.widget.ScrollBarDrawable 7352 */ 7353 protected int computeVerticalScrollOffset() { 7354 return mScrollY; 7355 } 7356 7357 /** 7358 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 7359 * within the vertical range. This value is used to compute the length 7360 * of the thumb within the scrollbar's track.</p> 7361 * 7362 * <p>The range is expressed in arbitrary units that must be the same as the 7363 * units used by {@link #computeVerticalScrollRange()} and 7364 * {@link #computeVerticalScrollOffset()}.</p> 7365 * 7366 * <p>The default extent is the drawing height of this view.</p> 7367 * 7368 * @return the vertical extent of the scrollbar's thumb 7369 * 7370 * @see #computeVerticalScrollRange() 7371 * @see #computeVerticalScrollOffset() 7372 * @see android.widget.ScrollBarDrawable 7373 */ 7374 protected int computeVerticalScrollExtent() { 7375 return getHeight(); 7376 } 7377 7378 /** 7379 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 7380 * scrollbars are painted only if they have been awakened first.</p> 7381 * 7382 * @param canvas the canvas on which to draw the scrollbars 7383 * 7384 * @see #awakenScrollBars(int) 7385 */ 7386 protected final void onDrawScrollBars(Canvas canvas) { 7387 // scrollbars are drawn only when the animation is running 7388 final ScrollabilityCache cache = mScrollCache; 7389 if (cache != null) { 7390 7391 int state = cache.state; 7392 7393 if (state == ScrollabilityCache.OFF) { 7394 return; 7395 } 7396 7397 boolean invalidate = false; 7398 7399 if (state == ScrollabilityCache.FADING) { 7400 // We're fading -- get our fade interpolation 7401 if (cache.interpolatorValues == null) { 7402 cache.interpolatorValues = new float[1]; 7403 } 7404 7405 float[] values = cache.interpolatorValues; 7406 7407 // Stops the animation if we're done 7408 if (cache.scrollBarInterpolator.timeToValues(values) == 7409 Interpolator.Result.FREEZE_END) { 7410 cache.state = ScrollabilityCache.OFF; 7411 } else { 7412 cache.scrollBar.setAlpha(Math.round(values[0])); 7413 } 7414 7415 // This will make the scroll bars inval themselves after 7416 // drawing. We only want this when we're fading so that 7417 // we prevent excessive redraws 7418 invalidate = true; 7419 } else { 7420 // We're just on -- but we may have been fading before so 7421 // reset alpha 7422 cache.scrollBar.setAlpha(255); 7423 } 7424 7425 7426 final int viewFlags = mViewFlags; 7427 7428 final boolean drawHorizontalScrollBar = 7429 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7430 final boolean drawVerticalScrollBar = 7431 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 7432 && !isVerticalScrollBarHidden(); 7433 7434 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 7435 final int width = mRight - mLeft; 7436 final int height = mBottom - mTop; 7437 7438 final ScrollBarDrawable scrollBar = cache.scrollBar; 7439 int size = scrollBar.getSize(false); 7440 if (size <= 0) { 7441 size = cache.scrollBarSize; 7442 } 7443 7444 final int scrollX = mScrollX; 7445 final int scrollY = mScrollY; 7446 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 7447 7448 int left, top, right, bottom; 7449 7450 if (drawHorizontalScrollBar) { 7451 scrollBar.setParameters(computeHorizontalScrollRange(), 7452 computeHorizontalScrollOffset(), 7453 computeHorizontalScrollExtent(), false); 7454 final int verticalScrollBarGap = drawVerticalScrollBar ? 7455 getVerticalScrollbarWidth() : 0; 7456 top = scrollY + height - size - (mUserPaddingBottom & inside); 7457 left = scrollX + (mPaddingLeft & inside); 7458 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 7459 bottom = top + size; 7460 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 7461 if (invalidate) { 7462 invalidate(left, top, right, bottom); 7463 } 7464 } 7465 7466 if (drawVerticalScrollBar) { 7467 scrollBar.setParameters(computeVerticalScrollRange(), 7468 computeVerticalScrollOffset(), 7469 computeVerticalScrollExtent(), true); 7470 switch (mVerticalScrollbarPosition) { 7471 default: 7472 case SCROLLBAR_POSITION_DEFAULT: 7473 case SCROLLBAR_POSITION_RIGHT: 7474 left = scrollX + width - size - (mUserPaddingRight & inside); 7475 break; 7476 case SCROLLBAR_POSITION_LEFT: 7477 left = scrollX + (mUserPaddingLeft & inside); 7478 break; 7479 } 7480 top = scrollY + (mPaddingTop & inside); 7481 right = left + size; 7482 bottom = scrollY + height - (mUserPaddingBottom & inside); 7483 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 7484 if (invalidate) { 7485 invalidate(left, top, right, bottom); 7486 } 7487 } 7488 } 7489 } 7490 } 7491 7492 /** 7493 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 7494 * FastScroller is visible. 7495 * @return whether to temporarily hide the vertical scrollbar 7496 * @hide 7497 */ 7498 protected boolean isVerticalScrollBarHidden() { 7499 return false; 7500 } 7501 7502 /** 7503 * <p>Draw the horizontal scrollbar if 7504 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 7505 * 7506 * @param canvas the canvas on which to draw the scrollbar 7507 * @param scrollBar the scrollbar's drawable 7508 * 7509 * @see #isHorizontalScrollBarEnabled() 7510 * @see #computeHorizontalScrollRange() 7511 * @see #computeHorizontalScrollExtent() 7512 * @see #computeHorizontalScrollOffset() 7513 * @see android.widget.ScrollBarDrawable 7514 * @hide 7515 */ 7516 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 7517 int l, int t, int r, int b) { 7518 scrollBar.setBounds(l, t, r, b); 7519 scrollBar.draw(canvas); 7520 } 7521 7522 /** 7523 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 7524 * returns true.</p> 7525 * 7526 * @param canvas the canvas on which to draw the scrollbar 7527 * @param scrollBar the scrollbar's drawable 7528 * 7529 * @see #isVerticalScrollBarEnabled() 7530 * @see #computeVerticalScrollRange() 7531 * @see #computeVerticalScrollExtent() 7532 * @see #computeVerticalScrollOffset() 7533 * @see android.widget.ScrollBarDrawable 7534 * @hide 7535 */ 7536 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 7537 int l, int t, int r, int b) { 7538 scrollBar.setBounds(l, t, r, b); 7539 scrollBar.draw(canvas); 7540 } 7541 7542 /** 7543 * Implement this to do your drawing. 7544 * 7545 * @param canvas the canvas on which the background will be drawn 7546 */ 7547 protected void onDraw(Canvas canvas) { 7548 } 7549 7550 /* 7551 * Caller is responsible for calling requestLayout if necessary. 7552 * (This allows addViewInLayout to not request a new layout.) 7553 */ 7554 void assignParent(ViewParent parent) { 7555 if (mParent == null) { 7556 mParent = parent; 7557 } else if (parent == null) { 7558 mParent = null; 7559 } else { 7560 throw new RuntimeException("view " + this + " being added, but" 7561 + " it already has a parent"); 7562 } 7563 } 7564 7565 /** 7566 * This is called when the view is attached to a window. At this point it 7567 * has a Surface and will start drawing. Note that this function is 7568 * guaranteed to be called before {@link #onDraw}, however it may be called 7569 * any time before the first onDraw -- including before or after 7570 * {@link #onMeasure}. 7571 * 7572 * @see #onDetachedFromWindow() 7573 */ 7574 protected void onAttachedToWindow() { 7575 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 7576 mParent.requestTransparentRegion(this); 7577 } 7578 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 7579 initialAwakenScrollBars(); 7580 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 7581 } 7582 jumpDrawablesToCurrentState(); 7583 } 7584 7585 /** 7586 * This is called when the view is detached from a window. At this point it 7587 * no longer has a surface for drawing. 7588 * 7589 * @see #onAttachedToWindow() 7590 */ 7591 protected void onDetachedFromWindow() { 7592 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 7593 7594 removeUnsetPressCallback(); 7595 removeLongPressCallback(); 7596 removePerformClickCallback(); 7597 7598 destroyDrawingCache(); 7599 7600 if (mHardwareLayer != null) { 7601 mHardwareLayer.destroy(); 7602 mHardwareLayer = null; 7603 } 7604 7605 if (mAttachInfo != null) { 7606 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 7607 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_RECT_MSG, this); 7608 } 7609 7610 mCurrentAnimation = null; 7611 } 7612 7613 /** 7614 * @return The number of times this view has been attached to a window 7615 */ 7616 protected int getWindowAttachCount() { 7617 return mWindowAttachCount; 7618 } 7619 7620 /** 7621 * Retrieve a unique token identifying the window this view is attached to. 7622 * @return Return the window's token for use in 7623 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 7624 */ 7625 public IBinder getWindowToken() { 7626 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 7627 } 7628 7629 /** 7630 * Retrieve a unique token identifying the top-level "real" window of 7631 * the window that this view is attached to. That is, this is like 7632 * {@link #getWindowToken}, except if the window this view in is a panel 7633 * window (attached to another containing window), then the token of 7634 * the containing window is returned instead. 7635 * 7636 * @return Returns the associated window token, either 7637 * {@link #getWindowToken()} or the containing window's token. 7638 */ 7639 public IBinder getApplicationWindowToken() { 7640 AttachInfo ai = mAttachInfo; 7641 if (ai != null) { 7642 IBinder appWindowToken = ai.mPanelParentWindowToken; 7643 if (appWindowToken == null) { 7644 appWindowToken = ai.mWindowToken; 7645 } 7646 return appWindowToken; 7647 } 7648 return null; 7649 } 7650 7651 /** 7652 * Retrieve private session object this view hierarchy is using to 7653 * communicate with the window manager. 7654 * @return the session object to communicate with the window manager 7655 */ 7656 /*package*/ IWindowSession getWindowSession() { 7657 return mAttachInfo != null ? mAttachInfo.mSession : null; 7658 } 7659 7660 /** 7661 * @param info the {@link android.view.View.AttachInfo} to associated with 7662 * this view 7663 */ 7664 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 7665 //System.out.println("Attached! " + this); 7666 mAttachInfo = info; 7667 mWindowAttachCount++; 7668 // We will need to evaluate the drawable state at least once. 7669 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 7670 if (mFloatingTreeObserver != null) { 7671 info.mTreeObserver.merge(mFloatingTreeObserver); 7672 mFloatingTreeObserver = null; 7673 } 7674 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 7675 mAttachInfo.mScrollContainers.add(this); 7676 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 7677 } 7678 performCollectViewAttributes(visibility); 7679 onAttachedToWindow(); 7680 int vis = info.mWindowVisibility; 7681 if (vis != GONE) { 7682 onWindowVisibilityChanged(vis); 7683 } 7684 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 7685 // If nobody has evaluated the drawable state yet, then do it now. 7686 refreshDrawableState(); 7687 } 7688 } 7689 7690 void dispatchDetachedFromWindow() { 7691 //System.out.println("Detached! " + this); 7692 AttachInfo info = mAttachInfo; 7693 if (info != null) { 7694 int vis = info.mWindowVisibility; 7695 if (vis != GONE) { 7696 onWindowVisibilityChanged(GONE); 7697 } 7698 } 7699 7700 onDetachedFromWindow(); 7701 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 7702 mAttachInfo.mScrollContainers.remove(this); 7703 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 7704 } 7705 mAttachInfo = null; 7706 } 7707 7708 /** 7709 * Store this view hierarchy's frozen state into the given container. 7710 * 7711 * @param container The SparseArray in which to save the view's state. 7712 * 7713 * @see #restoreHierarchyState 7714 * @see #dispatchSaveInstanceState 7715 * @see #onSaveInstanceState 7716 */ 7717 public void saveHierarchyState(SparseArray<Parcelable> container) { 7718 dispatchSaveInstanceState(container); 7719 } 7720 7721 /** 7722 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 7723 * May be overridden to modify how freezing happens to a view's children; for example, some 7724 * views may want to not store state for their children. 7725 * 7726 * @param container The SparseArray in which to save the view's state. 7727 * 7728 * @see #dispatchRestoreInstanceState 7729 * @see #saveHierarchyState 7730 * @see #onSaveInstanceState 7731 */ 7732 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 7733 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 7734 mPrivateFlags &= ~SAVE_STATE_CALLED; 7735 Parcelable state = onSaveInstanceState(); 7736 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7737 throw new IllegalStateException( 7738 "Derived class did not call super.onSaveInstanceState()"); 7739 } 7740 if (state != null) { 7741 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 7742 // + ": " + state); 7743 container.put(mID, state); 7744 } 7745 } 7746 } 7747 7748 /** 7749 * Hook allowing a view to generate a representation of its internal state 7750 * that can later be used to create a new instance with that same state. 7751 * This state should only contain information that is not persistent or can 7752 * not be reconstructed later. For example, you will never store your 7753 * current position on screen because that will be computed again when a 7754 * new instance of the view is placed in its view hierarchy. 7755 * <p> 7756 * Some examples of things you may store here: the current cursor position 7757 * in a text view (but usually not the text itself since that is stored in a 7758 * content provider or other persistent storage), the currently selected 7759 * item in a list view. 7760 * 7761 * @return Returns a Parcelable object containing the view's current dynamic 7762 * state, or null if there is nothing interesting to save. The 7763 * default implementation returns null. 7764 * @see #onRestoreInstanceState 7765 * @see #saveHierarchyState 7766 * @see #dispatchSaveInstanceState 7767 * @see #setSaveEnabled(boolean) 7768 */ 7769 protected Parcelable onSaveInstanceState() { 7770 mPrivateFlags |= SAVE_STATE_CALLED; 7771 return BaseSavedState.EMPTY_STATE; 7772 } 7773 7774 /** 7775 * Restore this view hierarchy's frozen state from the given container. 7776 * 7777 * @param container The SparseArray which holds previously frozen states. 7778 * 7779 * @see #saveHierarchyState 7780 * @see #dispatchRestoreInstanceState 7781 * @see #onRestoreInstanceState 7782 */ 7783 public void restoreHierarchyState(SparseArray<Parcelable> container) { 7784 dispatchRestoreInstanceState(container); 7785 } 7786 7787 /** 7788 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 7789 * children. May be overridden to modify how restoreing happens to a view's children; for 7790 * example, some views may want to not store state for their children. 7791 * 7792 * @param container The SparseArray which holds previously saved state. 7793 * 7794 * @see #dispatchSaveInstanceState 7795 * @see #restoreHierarchyState 7796 * @see #onRestoreInstanceState 7797 */ 7798 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 7799 if (mID != NO_ID) { 7800 Parcelable state = container.get(mID); 7801 if (state != null) { 7802 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 7803 // + ": " + state); 7804 mPrivateFlags &= ~SAVE_STATE_CALLED; 7805 onRestoreInstanceState(state); 7806 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7807 throw new IllegalStateException( 7808 "Derived class did not call super.onRestoreInstanceState()"); 7809 } 7810 } 7811 } 7812 } 7813 7814 /** 7815 * Hook allowing a view to re-apply a representation of its internal state that had previously 7816 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 7817 * null state. 7818 * 7819 * @param state The frozen state that had previously been returned by 7820 * {@link #onSaveInstanceState}. 7821 * 7822 * @see #onSaveInstanceState 7823 * @see #restoreHierarchyState 7824 * @see #dispatchRestoreInstanceState 7825 */ 7826 protected void onRestoreInstanceState(Parcelable state) { 7827 mPrivateFlags |= SAVE_STATE_CALLED; 7828 if (state != BaseSavedState.EMPTY_STATE && state != null) { 7829 throw new IllegalArgumentException("Wrong state class, expecting View State but " 7830 + "received " + state.getClass().toString() + " instead. This usually happens " 7831 + "when two views of different type have the same id in the same hierarchy. " 7832 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 7833 + "other views do not use the same id."); 7834 } 7835 } 7836 7837 /** 7838 * <p>Return the time at which the drawing of the view hierarchy started.</p> 7839 * 7840 * @return the drawing start time in milliseconds 7841 */ 7842 public long getDrawingTime() { 7843 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 7844 } 7845 7846 /** 7847 * <p>Enables or disables the duplication of the parent's state into this view. When 7848 * duplication is enabled, this view gets its drawable state from its parent rather 7849 * than from its own internal properties.</p> 7850 * 7851 * <p>Note: in the current implementation, setting this property to true after the 7852 * view was added to a ViewGroup might have no effect at all. This property should 7853 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 7854 * 7855 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 7856 * property is enabled, an exception will be thrown.</p> 7857 * 7858 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 7859 * parent, these states should not be affected by this method.</p> 7860 * 7861 * @param enabled True to enable duplication of the parent's drawable state, false 7862 * to disable it. 7863 * 7864 * @see #getDrawableState() 7865 * @see #isDuplicateParentStateEnabled() 7866 */ 7867 public void setDuplicateParentStateEnabled(boolean enabled) { 7868 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 7869 } 7870 7871 /** 7872 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 7873 * 7874 * @return True if this view's drawable state is duplicated from the parent, 7875 * false otherwise 7876 * 7877 * @see #getDrawableState() 7878 * @see #setDuplicateParentStateEnabled(boolean) 7879 */ 7880 public boolean isDuplicateParentStateEnabled() { 7881 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 7882 } 7883 7884 /** 7885 * <p>Specifies the type of layer backing this view. The layer can be 7886 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 7887 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 7888 * 7889 * <p>A layer is associated with an optional {@link android.graphics.Paint} 7890 * instance that controls how the layer is composed on screen. The following 7891 * properties of the paint are taken into account when composing the layer:</p> 7892 * <ul> 7893 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 7894 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 7895 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 7896 * </ul> 7897 * 7898 * <p>If this view has an alpha value set to < 1.0 by calling 7899 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 7900 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 7901 * equivalent to setting a hardware layer on this view and providing a paint with 7902 * the desired alpha value.<p> 7903 * 7904 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 7905 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 7906 * for more information on when and how to use layers.</p> 7907 * 7908 * @param layerType The ype of layer to use with this view, must be one of 7909 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7910 * {@link #LAYER_TYPE_HARDWARE} 7911 * @param paint The paint used to compose the layer. This argument is optional 7912 * and can be null. It is ignored when the layer type is 7913 * {@link #LAYER_TYPE_NONE} 7914 * 7915 * @see #getLayerType() 7916 * @see #LAYER_TYPE_NONE 7917 * @see #LAYER_TYPE_SOFTWARE 7918 * @see #LAYER_TYPE_HARDWARE 7919 * @see #setAlpha(float) 7920 * 7921 * @attr ref android.R.styleable#View_layerType 7922 */ 7923 public void setLayerType(int layerType, Paint paint) { 7924 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 7925 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 7926 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 7927 } 7928 7929 if (layerType == mLayerType) { 7930 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 7931 mLayerPaint = paint == null ? new Paint() : paint; 7932 if (mParent instanceof ViewGroup) { 7933 ((ViewGroup) mParent).invalidate(); 7934 } 7935 invalidate(); 7936 } 7937 return; 7938 } 7939 7940 // Destroy any previous software drawing cache if needed 7941 switch (mLayerType) { 7942 case LAYER_TYPE_SOFTWARE: 7943 if (mDrawingCache != null) { 7944 mDrawingCache.recycle(); 7945 mDrawingCache = null; 7946 } 7947 7948 if (mUnscaledDrawingCache != null) { 7949 mUnscaledDrawingCache.recycle(); 7950 mUnscaledDrawingCache = null; 7951 } 7952 break; 7953 case LAYER_TYPE_HARDWARE: 7954 if (mHardwareLayer != null) { 7955 mHardwareLayer.destroy(); 7956 mHardwareLayer = null; 7957 } 7958 break; 7959 default: 7960 break; 7961 } 7962 7963 mLayerType = layerType; 7964 mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : (paint == null ? new Paint() : paint); 7965 7966 if (mParent instanceof ViewGroup) { 7967 ((ViewGroup) mParent).invalidate(); 7968 } 7969 invalidate(); 7970 } 7971 7972 /** 7973 * Indicates what type of layer is currently associated with this view. By default 7974 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 7975 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 7976 * for more information on the different types of layers. 7977 * 7978 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7979 * {@link #LAYER_TYPE_HARDWARE} 7980 * 7981 * @see #setLayerType(int, android.graphics.Paint) 7982 * @see #LAYER_TYPE_NONE 7983 * @see #LAYER_TYPE_SOFTWARE 7984 * @see #LAYER_TYPE_HARDWARE 7985 */ 7986 public int getLayerType() { 7987 return mLayerType; 7988 } 7989 7990 /** 7991 * <p>Returns a hardware layer that can be used to draw this view again 7992 * without executing its draw method.</p> 7993 * 7994 * @return A HardwareLayer ready to render, or null if an error occurred. 7995 */ 7996 HardwareLayer getHardwareLayer(Canvas currentCanvas) { 7997 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 7998 return null; 7999 } 8000 8001 final int width = mRight - mLeft; 8002 final int height = mBottom - mTop; 8003 8004 if (width == 0 || height == 0) { 8005 return null; 8006 } 8007 8008 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 8009 if (mHardwareLayer == null) { 8010 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 8011 width, height, isOpaque()); 8012 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 8013 mHardwareLayer.resize(width, height); 8014 } 8015 8016 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 8017 try { 8018 canvas.setViewport(width, height); 8019 canvas.onPreDraw(); 8020 8021 computeScroll(); 8022 canvas.translate(-mScrollX, -mScrollY); 8023 8024 final int restoreCount = canvas.save(); 8025 8026 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8027 8028 // Fast path for layouts with no backgrounds 8029 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8030 mPrivateFlags &= ~DIRTY_MASK; 8031 dispatchDraw(canvas); 8032 } else { 8033 draw(canvas); 8034 } 8035 8036 canvas.restoreToCount(restoreCount); 8037 } finally { 8038 canvas.onPostDraw(); 8039 mHardwareLayer.end(currentCanvas); 8040 } 8041 } 8042 8043 return mHardwareLayer; 8044 } 8045 8046 /** 8047 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 8048 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 8049 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 8050 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 8051 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 8052 * null.</p> 8053 * 8054 * <p>Enabling the drawing cache is similar to 8055 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 8056 * acceleration is turned off. When hardware acceleration is turned on enabling the 8057 * drawing cache has either no effect or the cache used at drawing time is not a bitmap. 8058 * This API can however be used to manually generate a bitmap copy of this view.</p> 8059 * 8060 * @param enabled true to enable the drawing cache, false otherwise 8061 * 8062 * @see #isDrawingCacheEnabled() 8063 * @see #getDrawingCache() 8064 * @see #buildDrawingCache() 8065 * @see #setLayerType(int, android.graphics.Paint) 8066 */ 8067 public void setDrawingCacheEnabled(boolean enabled) { 8068 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 8069 } 8070 8071 /** 8072 * <p>Indicates whether the drawing cache is enabled for this view.</p> 8073 * 8074 * @return true if the drawing cache is enabled 8075 * 8076 * @see #setDrawingCacheEnabled(boolean) 8077 * @see #getDrawingCache() 8078 */ 8079 @ViewDebug.ExportedProperty(category = "drawing") 8080 public boolean isDrawingCacheEnabled() { 8081 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 8082 } 8083 8084 /** 8085 * <p>Returns a display list that can be used to draw this view again 8086 * without executing its draw method.</p> 8087 * 8088 * @return A DisplayList ready to replay, or null if caching is not enabled. 8089 */ 8090 DisplayList getDisplayList() { 8091 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8092 return null; 8093 } 8094 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8095 return null; 8096 } 8097 8098 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED && 8099 ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 8100 mDisplayList == null || !mDisplayList.isValid())) { 8101 8102 if (mDisplayList == null) { 8103 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 8104 } 8105 8106 final HardwareCanvas canvas = mDisplayList.start(); 8107 try { 8108 int width = mRight - mLeft; 8109 int height = mBottom - mTop; 8110 8111 canvas.setViewport(width, height); 8112 canvas.onPreDraw(); 8113 8114 final int restoreCount = canvas.save(); 8115 8116 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8117 8118 // Fast path for layouts with no backgrounds 8119 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8120 mPrivateFlags &= ~DIRTY_MASK; 8121 dispatchDraw(canvas); 8122 } else { 8123 draw(canvas); 8124 } 8125 8126 canvas.restoreToCount(restoreCount); 8127 } finally { 8128 canvas.onPostDraw(); 8129 8130 mDisplayList.end(); 8131 } 8132 } 8133 8134 return mDisplayList; 8135 } 8136 8137 /** 8138 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 8139 * 8140 * @return A non-scaled bitmap representing this view or null if cache is disabled. 8141 * 8142 * @see #getDrawingCache(boolean) 8143 */ 8144 public Bitmap getDrawingCache() { 8145 return getDrawingCache(false); 8146 } 8147 8148 /** 8149 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 8150 * is null when caching is disabled. If caching is enabled and the cache is not ready, 8151 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 8152 * draw from the cache when the cache is enabled. To benefit from the cache, you must 8153 * request the drawing cache by calling this method and draw it on screen if the 8154 * returned bitmap is not null.</p> 8155 * 8156 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8157 * this method will create a bitmap of the same size as this view. Because this bitmap 8158 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8159 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8160 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8161 * size than the view. This implies that your application must be able to handle this 8162 * size.</p> 8163 * 8164 * @param autoScale Indicates whether the generated bitmap should be scaled based on 8165 * the current density of the screen when the application is in compatibility 8166 * mode. 8167 * 8168 * @return A bitmap representing this view or null if cache is disabled. 8169 * 8170 * @see #setDrawingCacheEnabled(boolean) 8171 * @see #isDrawingCacheEnabled() 8172 * @see #buildDrawingCache(boolean) 8173 * @see #destroyDrawingCache() 8174 */ 8175 public Bitmap getDrawingCache(boolean autoScale) { 8176 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8177 return null; 8178 } 8179 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 8180 buildDrawingCache(autoScale); 8181 } 8182 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 8183 } 8184 8185 /** 8186 * <p>Frees the resources used by the drawing cache. If you call 8187 * {@link #buildDrawingCache()} manually without calling 8188 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8189 * should cleanup the cache with this method afterwards.</p> 8190 * 8191 * @see #setDrawingCacheEnabled(boolean) 8192 * @see #buildDrawingCache() 8193 * @see #getDrawingCache() 8194 */ 8195 public void destroyDrawingCache() { 8196 if (mDrawingCache != null) { 8197 mDrawingCache.recycle(); 8198 mDrawingCache = null; 8199 } 8200 if (mUnscaledDrawingCache != null) { 8201 mUnscaledDrawingCache.recycle(); 8202 mUnscaledDrawingCache = null; 8203 } 8204 if (mDisplayList != null) { 8205 mDisplayList.invalidate(); 8206 } 8207 } 8208 8209 /** 8210 * Setting a solid background color for the drawing cache's bitmaps will improve 8211 * perfromance and memory usage. Note, though that this should only be used if this 8212 * view will always be drawn on top of a solid color. 8213 * 8214 * @param color The background color to use for the drawing cache's bitmap 8215 * 8216 * @see #setDrawingCacheEnabled(boolean) 8217 * @see #buildDrawingCache() 8218 * @see #getDrawingCache() 8219 */ 8220 public void setDrawingCacheBackgroundColor(int color) { 8221 if (color != mDrawingCacheBackgroundColor) { 8222 mDrawingCacheBackgroundColor = color; 8223 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8224 } 8225 } 8226 8227 /** 8228 * @see #setDrawingCacheBackgroundColor(int) 8229 * 8230 * @return The background color to used for the drawing cache's bitmap 8231 */ 8232 public int getDrawingCacheBackgroundColor() { 8233 return mDrawingCacheBackgroundColor; 8234 } 8235 8236 /** 8237 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 8238 * 8239 * @see #buildDrawingCache(boolean) 8240 */ 8241 public void buildDrawingCache() { 8242 buildDrawingCache(false); 8243 } 8244 8245 /** 8246 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 8247 * 8248 * <p>If you call {@link #buildDrawingCache()} manually without calling 8249 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8250 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 8251 * 8252 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8253 * this method will create a bitmap of the same size as this view. Because this bitmap 8254 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8255 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8256 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8257 * size than the view. This implies that your application must be able to handle this 8258 * size.</p> 8259 * 8260 * <p>You should avoid calling this method when hardware acceleration is enabled. If 8261 * you do not need the drawing cache bitmap, calling this method will increase memory 8262 * usage and cause the view to be rendered in software once, thus negatively impacting 8263 * performance.</p> 8264 * 8265 * @see #getDrawingCache() 8266 * @see #destroyDrawingCache() 8267 */ 8268 public void buildDrawingCache(boolean autoScale) { 8269 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 8270 mDrawingCache == null : mUnscaledDrawingCache == null)) { 8271 8272 if (ViewDebug.TRACE_HIERARCHY) { 8273 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 8274 } 8275 8276 int width = mRight - mLeft; 8277 int height = mBottom - mTop; 8278 8279 final AttachInfo attachInfo = mAttachInfo; 8280 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 8281 8282 if (autoScale && scalingRequired) { 8283 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 8284 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 8285 } 8286 8287 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 8288 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 8289 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 8290 8291 if (width <= 0 || height <= 0 || 8292 // Projected bitmap size in bytes 8293 (width * height * (opaque && !use32BitCache ? 2 : 4) > 8294 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 8295 destroyDrawingCache(); 8296 return; 8297 } 8298 8299 boolean clear = true; 8300 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 8301 8302 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 8303 Bitmap.Config quality; 8304 if (!opaque) { 8305 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 8306 case DRAWING_CACHE_QUALITY_AUTO: 8307 quality = Bitmap.Config.ARGB_8888; 8308 break; 8309 case DRAWING_CACHE_QUALITY_LOW: 8310 quality = Bitmap.Config.ARGB_4444; 8311 break; 8312 case DRAWING_CACHE_QUALITY_HIGH: 8313 quality = Bitmap.Config.ARGB_8888; 8314 break; 8315 default: 8316 quality = Bitmap.Config.ARGB_8888; 8317 break; 8318 } 8319 } else { 8320 // Optimization for translucent windows 8321 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 8322 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 8323 } 8324 8325 // Try to cleanup memory 8326 if (bitmap != null) bitmap.recycle(); 8327 8328 try { 8329 bitmap = Bitmap.createBitmap(width, height, quality); 8330 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8331 if (autoScale) { 8332 mDrawingCache = bitmap; 8333 } else { 8334 mUnscaledDrawingCache = bitmap; 8335 } 8336 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 8337 } catch (OutOfMemoryError e) { 8338 // If there is not enough memory to create the bitmap cache, just 8339 // ignore the issue as bitmap caches are not required to draw the 8340 // view hierarchy 8341 if (autoScale) { 8342 mDrawingCache = null; 8343 } else { 8344 mUnscaledDrawingCache = null; 8345 } 8346 return; 8347 } 8348 8349 clear = drawingCacheBackgroundColor != 0; 8350 } 8351 8352 Canvas canvas; 8353 if (attachInfo != null) { 8354 canvas = attachInfo.mCanvas; 8355 if (canvas == null) { 8356 canvas = new Canvas(); 8357 } 8358 canvas.setBitmap(bitmap); 8359 // Temporarily clobber the cached Canvas in case one of our children 8360 // is also using a drawing cache. Without this, the children would 8361 // steal the canvas by attaching their own bitmap to it and bad, bad 8362 // thing would happen (invisible views, corrupted drawings, etc.) 8363 attachInfo.mCanvas = null; 8364 } else { 8365 // This case should hopefully never or seldom happen 8366 canvas = new Canvas(bitmap); 8367 } 8368 8369 if (clear) { 8370 bitmap.eraseColor(drawingCacheBackgroundColor); 8371 } 8372 8373 computeScroll(); 8374 final int restoreCount = canvas.save(); 8375 8376 if (autoScale && scalingRequired) { 8377 final float scale = attachInfo.mApplicationScale; 8378 canvas.scale(scale, scale); 8379 } 8380 8381 canvas.translate(-mScrollX, -mScrollY); 8382 8383 mPrivateFlags |= DRAWN; 8384 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 8385 mLayerType != LAYER_TYPE_NONE) { 8386 mPrivateFlags |= DRAWING_CACHE_VALID; 8387 } 8388 8389 // Fast path for layouts with no backgrounds 8390 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8391 if (ViewDebug.TRACE_HIERARCHY) { 8392 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8393 } 8394 mPrivateFlags &= ~DIRTY_MASK; 8395 dispatchDraw(canvas); 8396 } else { 8397 draw(canvas); 8398 } 8399 8400 canvas.restoreToCount(restoreCount); 8401 8402 if (attachInfo != null) { 8403 // Restore the cached Canvas for our siblings 8404 attachInfo.mCanvas = canvas; 8405 } 8406 } 8407 } 8408 8409 /** 8410 * Create a snapshot of the view into a bitmap. We should probably make 8411 * some form of this public, but should think about the API. 8412 */ 8413 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 8414 int width = mRight - mLeft; 8415 int height = mBottom - mTop; 8416 8417 final AttachInfo attachInfo = mAttachInfo; 8418 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 8419 width = (int) ((width * scale) + 0.5f); 8420 height = (int) ((height * scale) + 0.5f); 8421 8422 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 8423 if (bitmap == null) { 8424 throw new OutOfMemoryError(); 8425 } 8426 8427 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8428 8429 Canvas canvas; 8430 if (attachInfo != null) { 8431 canvas = attachInfo.mCanvas; 8432 if (canvas == null) { 8433 canvas = new Canvas(); 8434 } 8435 canvas.setBitmap(bitmap); 8436 // Temporarily clobber the cached Canvas in case one of our children 8437 // is also using a drawing cache. Without this, the children would 8438 // steal the canvas by attaching their own bitmap to it and bad, bad 8439 // things would happen (invisible views, corrupted drawings, etc.) 8440 attachInfo.mCanvas = null; 8441 } else { 8442 // This case should hopefully never or seldom happen 8443 canvas = new Canvas(bitmap); 8444 } 8445 8446 if ((backgroundColor & 0xff000000) != 0) { 8447 bitmap.eraseColor(backgroundColor); 8448 } 8449 8450 computeScroll(); 8451 final int restoreCount = canvas.save(); 8452 canvas.scale(scale, scale); 8453 canvas.translate(-mScrollX, -mScrollY); 8454 8455 // Temporarily remove the dirty mask 8456 int flags = mPrivateFlags; 8457 mPrivateFlags &= ~DIRTY_MASK; 8458 8459 // Fast path for layouts with no backgrounds 8460 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8461 dispatchDraw(canvas); 8462 } else { 8463 draw(canvas); 8464 } 8465 8466 mPrivateFlags = flags; 8467 8468 canvas.restoreToCount(restoreCount); 8469 8470 if (attachInfo != null) { 8471 // Restore the cached Canvas for our siblings 8472 attachInfo.mCanvas = canvas; 8473 } 8474 8475 return bitmap; 8476 } 8477 8478 /** 8479 * Indicates whether this View is currently in edit mode. A View is usually 8480 * in edit mode when displayed within a developer tool. For instance, if 8481 * this View is being drawn by a visual user interface builder, this method 8482 * should return true. 8483 * 8484 * Subclasses should check the return value of this method to provide 8485 * different behaviors if their normal behavior might interfere with the 8486 * host environment. For instance: the class spawns a thread in its 8487 * constructor, the drawing code relies on device-specific features, etc. 8488 * 8489 * This method is usually checked in the drawing code of custom widgets. 8490 * 8491 * @return True if this View is in edit mode, false otherwise. 8492 */ 8493 public boolean isInEditMode() { 8494 return false; 8495 } 8496 8497 /** 8498 * If the View draws content inside its padding and enables fading edges, 8499 * it needs to support padding offsets. Padding offsets are added to the 8500 * fading edges to extend the length of the fade so that it covers pixels 8501 * drawn inside the padding. 8502 * 8503 * Subclasses of this class should override this method if they need 8504 * to draw content inside the padding. 8505 * 8506 * @return True if padding offset must be applied, false otherwise. 8507 * 8508 * @see #getLeftPaddingOffset() 8509 * @see #getRightPaddingOffset() 8510 * @see #getTopPaddingOffset() 8511 * @see #getBottomPaddingOffset() 8512 * 8513 * @since CURRENT 8514 */ 8515 protected boolean isPaddingOffsetRequired() { 8516 return false; 8517 } 8518 8519 /** 8520 * Amount by which to extend the left fading region. Called only when 8521 * {@link #isPaddingOffsetRequired()} returns true. 8522 * 8523 * @return The left padding offset in pixels. 8524 * 8525 * @see #isPaddingOffsetRequired() 8526 * 8527 * @since CURRENT 8528 */ 8529 protected int getLeftPaddingOffset() { 8530 return 0; 8531 } 8532 8533 /** 8534 * Amount by which to extend the right fading region. Called only when 8535 * {@link #isPaddingOffsetRequired()} returns true. 8536 * 8537 * @return The right padding offset in pixels. 8538 * 8539 * @see #isPaddingOffsetRequired() 8540 * 8541 * @since CURRENT 8542 */ 8543 protected int getRightPaddingOffset() { 8544 return 0; 8545 } 8546 8547 /** 8548 * Amount by which to extend the top fading region. Called only when 8549 * {@link #isPaddingOffsetRequired()} returns true. 8550 * 8551 * @return The top padding offset in pixels. 8552 * 8553 * @see #isPaddingOffsetRequired() 8554 * 8555 * @since CURRENT 8556 */ 8557 protected int getTopPaddingOffset() { 8558 return 0; 8559 } 8560 8561 /** 8562 * Amount by which to extend the bottom fading region. Called only when 8563 * {@link #isPaddingOffsetRequired()} returns true. 8564 * 8565 * @return The bottom padding offset in pixels. 8566 * 8567 * @see #isPaddingOffsetRequired() 8568 * 8569 * @since CURRENT 8570 */ 8571 protected int getBottomPaddingOffset() { 8572 return 0; 8573 } 8574 8575 /** 8576 * <p>Indicates whether this view is attached to an hardware accelerated 8577 * window or not.</p> 8578 * 8579 * <p>Even if this method returns true, it does not mean that every call 8580 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 8581 * accelerated {@link android.graphics.Canvas}. For instance, if this view 8582 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 8583 * window is hardware accelerated, 8584 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 8585 * return false, and this method will return true.</p> 8586 * 8587 * @return True if the view is attached to a window and the window is 8588 * hardware accelerated; false in any other case. 8589 */ 8590 public boolean isHardwareAccelerated() { 8591 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 8592 } 8593 8594 /** 8595 * Manually render this view (and all of its children) to the given Canvas. 8596 * The view must have already done a full layout before this function is 8597 * called. When implementing a view, implement {@link #onDraw} instead of 8598 * overriding this method. If you do need to override this method, call 8599 * the superclass version. 8600 * 8601 * @param canvas The Canvas to which the View is rendered. 8602 */ 8603 public void draw(Canvas canvas) { 8604 if (ViewDebug.TRACE_HIERARCHY) { 8605 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8606 } 8607 8608 final int privateFlags = mPrivateFlags; 8609 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 8610 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 8611 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 8612 8613 /* 8614 * Draw traversal performs several drawing steps which must be executed 8615 * in the appropriate order: 8616 * 8617 * 1. Draw the background 8618 * 2. If necessary, save the canvas' layers to prepare for fading 8619 * 3. Draw view's content 8620 * 4. Draw children 8621 * 5. If necessary, draw the fading edges and restore layers 8622 * 6. Draw decorations (scrollbars for instance) 8623 */ 8624 8625 // Step 1, draw the background, if needed 8626 int saveCount; 8627 8628 if (!dirtyOpaque) { 8629 final Drawable background = mBGDrawable; 8630 if (background != null) { 8631 final int scrollX = mScrollX; 8632 final int scrollY = mScrollY; 8633 8634 if (mBackgroundSizeChanged) { 8635 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 8636 mBackgroundSizeChanged = false; 8637 } 8638 8639 if ((scrollX | scrollY) == 0) { 8640 background.draw(canvas); 8641 } else { 8642 canvas.translate(scrollX, scrollY); 8643 background.draw(canvas); 8644 canvas.translate(-scrollX, -scrollY); 8645 } 8646 } 8647 } 8648 8649 // skip step 2 & 5 if possible (common case) 8650 final int viewFlags = mViewFlags; 8651 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 8652 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 8653 if (!verticalEdges && !horizontalEdges) { 8654 // Step 3, draw the content 8655 if (!dirtyOpaque) onDraw(canvas); 8656 8657 // Step 4, draw the children 8658 dispatchDraw(canvas); 8659 8660 // Step 6, draw decorations (scrollbars) 8661 onDrawScrollBars(canvas); 8662 8663 // we're done... 8664 return; 8665 } 8666 8667 /* 8668 * Here we do the full fledged routine... 8669 * (this is an uncommon case where speed matters less, 8670 * this is why we repeat some of the tests that have been 8671 * done above) 8672 */ 8673 8674 boolean drawTop = false; 8675 boolean drawBottom = false; 8676 boolean drawLeft = false; 8677 boolean drawRight = false; 8678 8679 float topFadeStrength = 0.0f; 8680 float bottomFadeStrength = 0.0f; 8681 float leftFadeStrength = 0.0f; 8682 float rightFadeStrength = 0.0f; 8683 8684 // Step 2, save the canvas' layers 8685 int paddingLeft = mPaddingLeft; 8686 int paddingTop = mPaddingTop; 8687 8688 final boolean offsetRequired = isPaddingOffsetRequired(); 8689 if (offsetRequired) { 8690 paddingLeft += getLeftPaddingOffset(); 8691 paddingTop += getTopPaddingOffset(); 8692 } 8693 8694 int left = mScrollX + paddingLeft; 8695 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 8696 int top = mScrollY + paddingTop; 8697 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 8698 8699 if (offsetRequired) { 8700 right += getRightPaddingOffset(); 8701 bottom += getBottomPaddingOffset(); 8702 } 8703 8704 final ScrollabilityCache scrollabilityCache = mScrollCache; 8705 int length = scrollabilityCache.fadingEdgeLength; 8706 8707 // clip the fade length if top and bottom fades overlap 8708 // overlapping fades produce odd-looking artifacts 8709 if (verticalEdges && (top + length > bottom - length)) { 8710 length = (bottom - top) / 2; 8711 } 8712 8713 // also clip horizontal fades if necessary 8714 if (horizontalEdges && (left + length > right - length)) { 8715 length = (right - left) / 2; 8716 } 8717 8718 if (verticalEdges) { 8719 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 8720 drawTop = topFadeStrength > 0.0f; 8721 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 8722 drawBottom = bottomFadeStrength > 0.0f; 8723 } 8724 8725 if (horizontalEdges) { 8726 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 8727 drawLeft = leftFadeStrength > 0.0f; 8728 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 8729 drawRight = rightFadeStrength > 0.0f; 8730 } 8731 8732 saveCount = canvas.getSaveCount(); 8733 8734 int solidColor = getSolidColor(); 8735 if (solidColor == 0) { 8736 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 8737 8738 if (drawTop) { 8739 canvas.saveLayer(left, top, right, top + length, null, flags); 8740 } 8741 8742 if (drawBottom) { 8743 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 8744 } 8745 8746 if (drawLeft) { 8747 canvas.saveLayer(left, top, left + length, bottom, null, flags); 8748 } 8749 8750 if (drawRight) { 8751 canvas.saveLayer(right - length, top, right, bottom, null, flags); 8752 } 8753 } else { 8754 scrollabilityCache.setFadeColor(solidColor); 8755 } 8756 8757 // Step 3, draw the content 8758 if (!dirtyOpaque) onDraw(canvas); 8759 8760 // Step 4, draw the children 8761 dispatchDraw(canvas); 8762 8763 // Step 5, draw the fade effect and restore layers 8764 final Paint p = scrollabilityCache.paint; 8765 final Matrix matrix = scrollabilityCache.matrix; 8766 final Shader fade = scrollabilityCache.shader; 8767 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 8768 8769 if (drawTop) { 8770 matrix.setScale(1, fadeHeight * topFadeStrength); 8771 matrix.postTranslate(left, top); 8772 fade.setLocalMatrix(matrix); 8773 canvas.drawRect(left, top, right, top + length, p); 8774 } 8775 8776 if (drawBottom) { 8777 matrix.setScale(1, fadeHeight * bottomFadeStrength); 8778 matrix.postRotate(180); 8779 matrix.postTranslate(left, bottom); 8780 fade.setLocalMatrix(matrix); 8781 canvas.drawRect(left, bottom - length, right, bottom, p); 8782 } 8783 8784 if (drawLeft) { 8785 matrix.setScale(1, fadeHeight * leftFadeStrength); 8786 matrix.postRotate(-90); 8787 matrix.postTranslate(left, top); 8788 fade.setLocalMatrix(matrix); 8789 canvas.drawRect(left, top, left + length, bottom, p); 8790 } 8791 8792 if (drawRight) { 8793 matrix.setScale(1, fadeHeight * rightFadeStrength); 8794 matrix.postRotate(90); 8795 matrix.postTranslate(right, top); 8796 fade.setLocalMatrix(matrix); 8797 canvas.drawRect(right - length, top, right, bottom, p); 8798 } 8799 8800 canvas.restoreToCount(saveCount); 8801 8802 // Step 6, draw decorations (scrollbars) 8803 onDrawScrollBars(canvas); 8804 } 8805 8806 /** 8807 * Override this if your view is known to always be drawn on top of a solid color background, 8808 * and needs to draw fading edges. Returning a non-zero color enables the view system to 8809 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 8810 * should be set to 0xFF. 8811 * 8812 * @see #setVerticalFadingEdgeEnabled 8813 * @see #setHorizontalFadingEdgeEnabled 8814 * 8815 * @return The known solid color background for this view, or 0 if the color may vary 8816 */ 8817 public int getSolidColor() { 8818 return 0; 8819 } 8820 8821 /** 8822 * Build a human readable string representation of the specified view flags. 8823 * 8824 * @param flags the view flags to convert to a string 8825 * @return a String representing the supplied flags 8826 */ 8827 private static String printFlags(int flags) { 8828 String output = ""; 8829 int numFlags = 0; 8830 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 8831 output += "TAKES_FOCUS"; 8832 numFlags++; 8833 } 8834 8835 switch (flags & VISIBILITY_MASK) { 8836 case INVISIBLE: 8837 if (numFlags > 0) { 8838 output += " "; 8839 } 8840 output += "INVISIBLE"; 8841 // USELESS HERE numFlags++; 8842 break; 8843 case GONE: 8844 if (numFlags > 0) { 8845 output += " "; 8846 } 8847 output += "GONE"; 8848 // USELESS HERE numFlags++; 8849 break; 8850 default: 8851 break; 8852 } 8853 return output; 8854 } 8855 8856 /** 8857 * Build a human readable string representation of the specified private 8858 * view flags. 8859 * 8860 * @param privateFlags the private view flags to convert to a string 8861 * @return a String representing the supplied flags 8862 */ 8863 private static String printPrivateFlags(int privateFlags) { 8864 String output = ""; 8865 int numFlags = 0; 8866 8867 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 8868 output += "WANTS_FOCUS"; 8869 numFlags++; 8870 } 8871 8872 if ((privateFlags & FOCUSED) == FOCUSED) { 8873 if (numFlags > 0) { 8874 output += " "; 8875 } 8876 output += "FOCUSED"; 8877 numFlags++; 8878 } 8879 8880 if ((privateFlags & SELECTED) == SELECTED) { 8881 if (numFlags > 0) { 8882 output += " "; 8883 } 8884 output += "SELECTED"; 8885 numFlags++; 8886 } 8887 8888 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 8889 if (numFlags > 0) { 8890 output += " "; 8891 } 8892 output += "IS_ROOT_NAMESPACE"; 8893 numFlags++; 8894 } 8895 8896 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 8897 if (numFlags > 0) { 8898 output += " "; 8899 } 8900 output += "HAS_BOUNDS"; 8901 numFlags++; 8902 } 8903 8904 if ((privateFlags & DRAWN) == DRAWN) { 8905 if (numFlags > 0) { 8906 output += " "; 8907 } 8908 output += "DRAWN"; 8909 // USELESS HERE numFlags++; 8910 } 8911 return output; 8912 } 8913 8914 /** 8915 * <p>Indicates whether or not this view's layout will be requested during 8916 * the next hierarchy layout pass.</p> 8917 * 8918 * @return true if the layout will be forced during next layout pass 8919 */ 8920 public boolean isLayoutRequested() { 8921 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 8922 } 8923 8924 /** 8925 * Assign a size and position to a view and all of its 8926 * descendants 8927 * 8928 * <p>This is the second phase of the layout mechanism. 8929 * (The first is measuring). In this phase, each parent calls 8930 * layout on all of its children to position them. 8931 * This is typically done using the child measurements 8932 * that were stored in the measure pass().</p> 8933 * 8934 * <p>Derived classes should not override this method. 8935 * Derived classes with children should override 8936 * onLayout. In that method, they should 8937 * call layout on each of their children.</p> 8938 * 8939 * @param l Left position, relative to parent 8940 * @param t Top position, relative to parent 8941 * @param r Right position, relative to parent 8942 * @param b Bottom position, relative to parent 8943 */ 8944 @SuppressWarnings({"unchecked"}) 8945 public void layout(int l, int t, int r, int b) { 8946 int oldL = mLeft; 8947 int oldT = mTop; 8948 int oldB = mBottom; 8949 int oldR = mRight; 8950 boolean changed = setFrame(l, t, r, b); 8951 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 8952 if (ViewDebug.TRACE_HIERARCHY) { 8953 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 8954 } 8955 8956 onLayout(changed, l, t, r, b); 8957 mPrivateFlags &= ~LAYOUT_REQUIRED; 8958 8959 if (mOnLayoutChangeListeners != null) { 8960 ArrayList<OnLayoutChangeListener> listenersCopy = 8961 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 8962 int numListeners = listenersCopy.size(); 8963 for (int i = 0; i < numListeners; ++i) { 8964 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 8965 } 8966 } 8967 } 8968 mPrivateFlags &= ~FORCE_LAYOUT; 8969 } 8970 8971 /** 8972 * Called from layout when this view should 8973 * assign a size and position to each of its children. 8974 * 8975 * Derived classes with children should override 8976 * this method and call layout on each of 8977 * their children. 8978 * @param changed This is a new size or position for this view 8979 * @param left Left position, relative to parent 8980 * @param top Top position, relative to parent 8981 * @param right Right position, relative to parent 8982 * @param bottom Bottom position, relative to parent 8983 */ 8984 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 8985 } 8986 8987 /** 8988 * Assign a size and position to this view. 8989 * 8990 * This is called from layout. 8991 * 8992 * @param left Left position, relative to parent 8993 * @param top Top position, relative to parent 8994 * @param right Right position, relative to parent 8995 * @param bottom Bottom position, relative to parent 8996 * @return true if the new size and position are different than the 8997 * previous ones 8998 * {@hide} 8999 */ 9000 protected boolean setFrame(int left, int top, int right, int bottom) { 9001 boolean changed = false; 9002 9003 if (DBG) { 9004 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 9005 + right + "," + bottom + ")"); 9006 } 9007 9008 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 9009 changed = true; 9010 9011 // Remember our drawn bit 9012 int drawn = mPrivateFlags & DRAWN; 9013 9014 // Invalidate our old position 9015 invalidate(); 9016 9017 9018 int oldWidth = mRight - mLeft; 9019 int oldHeight = mBottom - mTop; 9020 9021 mLeft = left; 9022 mTop = top; 9023 mRight = right; 9024 mBottom = bottom; 9025 9026 mPrivateFlags |= HAS_BOUNDS; 9027 9028 int newWidth = right - left; 9029 int newHeight = bottom - top; 9030 9031 if (newWidth != oldWidth || newHeight != oldHeight) { 9032 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9033 // A change in dimension means an auto-centered pivot point changes, too 9034 mMatrixDirty = true; 9035 } 9036 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 9037 } 9038 9039 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 9040 // If we are visible, force the DRAWN bit to on so that 9041 // this invalidate will go through (at least to our parent). 9042 // This is because someone may have invalidated this view 9043 // before this call to setFrame came in, thereby clearing 9044 // the DRAWN bit. 9045 mPrivateFlags |= DRAWN; 9046 invalidate(); 9047 } 9048 9049 // Reset drawn bit to original value (invalidate turns it off) 9050 mPrivateFlags |= drawn; 9051 9052 mBackgroundSizeChanged = true; 9053 } 9054 return changed; 9055 } 9056 9057 /** 9058 * Finalize inflating a view from XML. This is called as the last phase 9059 * of inflation, after all child views have been added. 9060 * 9061 * <p>Even if the subclass overrides onFinishInflate, they should always be 9062 * sure to call the super method, so that we get called. 9063 */ 9064 protected void onFinishInflate() { 9065 } 9066 9067 /** 9068 * Returns the resources associated with this view. 9069 * 9070 * @return Resources object. 9071 */ 9072 public Resources getResources() { 9073 return mResources; 9074 } 9075 9076 /** 9077 * Invalidates the specified Drawable. 9078 * 9079 * @param drawable the drawable to invalidate 9080 */ 9081 public void invalidateDrawable(Drawable drawable) { 9082 if (verifyDrawable(drawable)) { 9083 final Rect dirty = drawable.getBounds(); 9084 final int scrollX = mScrollX; 9085 final int scrollY = mScrollY; 9086 9087 invalidate(dirty.left + scrollX, dirty.top + scrollY, 9088 dirty.right + scrollX, dirty.bottom + scrollY); 9089 } 9090 } 9091 9092 /** 9093 * Schedules an action on a drawable to occur at a specified time. 9094 * 9095 * @param who the recipient of the action 9096 * @param what the action to run on the drawable 9097 * @param when the time at which the action must occur. Uses the 9098 * {@link SystemClock#uptimeMillis} timebase. 9099 */ 9100 public void scheduleDrawable(Drawable who, Runnable what, long when) { 9101 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9102 mAttachInfo.mHandler.postAtTime(what, who, when); 9103 } 9104 } 9105 9106 /** 9107 * Cancels a scheduled action on a drawable. 9108 * 9109 * @param who the recipient of the action 9110 * @param what the action to cancel 9111 */ 9112 public void unscheduleDrawable(Drawable who, Runnable what) { 9113 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9114 mAttachInfo.mHandler.removeCallbacks(what, who); 9115 } 9116 } 9117 9118 /** 9119 * Unschedule any events associated with the given Drawable. This can be 9120 * used when selecting a new Drawable into a view, so that the previous 9121 * one is completely unscheduled. 9122 * 9123 * @param who The Drawable to unschedule. 9124 * 9125 * @see #drawableStateChanged 9126 */ 9127 public void unscheduleDrawable(Drawable who) { 9128 if (mAttachInfo != null) { 9129 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 9130 } 9131 } 9132 9133 /** 9134 * If your view subclass is displaying its own Drawable objects, it should 9135 * override this function and return true for any Drawable it is 9136 * displaying. This allows animations for those drawables to be 9137 * scheduled. 9138 * 9139 * <p>Be sure to call through to the super class when overriding this 9140 * function. 9141 * 9142 * @param who The Drawable to verify. Return true if it is one you are 9143 * displaying, else return the result of calling through to the 9144 * super class. 9145 * 9146 * @return boolean If true than the Drawable is being displayed in the 9147 * view; else false and it is not allowed to animate. 9148 * 9149 * @see #unscheduleDrawable 9150 * @see #drawableStateChanged 9151 */ 9152 protected boolean verifyDrawable(Drawable who) { 9153 return who == mBGDrawable; 9154 } 9155 9156 /** 9157 * This function is called whenever the state of the view changes in such 9158 * a way that it impacts the state of drawables being shown. 9159 * 9160 * <p>Be sure to call through to the superclass when overriding this 9161 * function. 9162 * 9163 * @see Drawable#setState 9164 */ 9165 protected void drawableStateChanged() { 9166 Drawable d = mBGDrawable; 9167 if (d != null && d.isStateful()) { 9168 d.setState(getDrawableState()); 9169 } 9170 } 9171 9172 /** 9173 * Call this to force a view to update its drawable state. This will cause 9174 * drawableStateChanged to be called on this view. Views that are interested 9175 * in the new state should call getDrawableState. 9176 * 9177 * @see #drawableStateChanged 9178 * @see #getDrawableState 9179 */ 9180 public void refreshDrawableState() { 9181 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9182 drawableStateChanged(); 9183 9184 ViewParent parent = mParent; 9185 if (parent != null) { 9186 parent.childDrawableStateChanged(this); 9187 } 9188 } 9189 9190 /** 9191 * Return an array of resource IDs of the drawable states representing the 9192 * current state of the view. 9193 * 9194 * @return The current drawable state 9195 * 9196 * @see Drawable#setState 9197 * @see #drawableStateChanged 9198 * @see #onCreateDrawableState 9199 */ 9200 public final int[] getDrawableState() { 9201 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 9202 return mDrawableState; 9203 } else { 9204 mDrawableState = onCreateDrawableState(0); 9205 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 9206 return mDrawableState; 9207 } 9208 } 9209 9210 /** 9211 * Generate the new {@link android.graphics.drawable.Drawable} state for 9212 * this view. This is called by the view 9213 * system when the cached Drawable state is determined to be invalid. To 9214 * retrieve the current state, you should use {@link #getDrawableState}. 9215 * 9216 * @param extraSpace if non-zero, this is the number of extra entries you 9217 * would like in the returned array in which you can place your own 9218 * states. 9219 * 9220 * @return Returns an array holding the current {@link Drawable} state of 9221 * the view. 9222 * 9223 * @see #mergeDrawableStates 9224 */ 9225 protected int[] onCreateDrawableState(int extraSpace) { 9226 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 9227 mParent instanceof View) { 9228 return ((View) mParent).onCreateDrawableState(extraSpace); 9229 } 9230 9231 int[] drawableState; 9232 9233 int privateFlags = mPrivateFlags; 9234 9235 int viewStateIndex = 0; 9236 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 9237 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 9238 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 9239 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 9240 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 9241 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 9242 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested) { 9243 // This is set if HW acceleration is requested, even if the current 9244 // process doesn't allow it. This is just to allow app preview 9245 // windows to better match their app. 9246 viewStateIndex |= VIEW_STATE_ACCELERATED; 9247 } 9248 9249 drawableState = VIEW_STATE_SETS[viewStateIndex]; 9250 9251 //noinspection ConstantIfStatement 9252 if (false) { 9253 Log.i("View", "drawableStateIndex=" + viewStateIndex); 9254 Log.i("View", toString() 9255 + " pressed=" + ((privateFlags & PRESSED) != 0) 9256 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 9257 + " fo=" + hasFocus() 9258 + " sl=" + ((privateFlags & SELECTED) != 0) 9259 + " wf=" + hasWindowFocus() 9260 + ": " + Arrays.toString(drawableState)); 9261 } 9262 9263 if (extraSpace == 0) { 9264 return drawableState; 9265 } 9266 9267 final int[] fullState; 9268 if (drawableState != null) { 9269 fullState = new int[drawableState.length + extraSpace]; 9270 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 9271 } else { 9272 fullState = new int[extraSpace]; 9273 } 9274 9275 return fullState; 9276 } 9277 9278 /** 9279 * Merge your own state values in <var>additionalState</var> into the base 9280 * state values <var>baseState</var> that were returned by 9281 * {@link #onCreateDrawableState}. 9282 * 9283 * @param baseState The base state values returned by 9284 * {@link #onCreateDrawableState}, which will be modified to also hold your 9285 * own additional state values. 9286 * 9287 * @param additionalState The additional state values you would like 9288 * added to <var>baseState</var>; this array is not modified. 9289 * 9290 * @return As a convenience, the <var>baseState</var> array you originally 9291 * passed into the function is returned. 9292 * 9293 * @see #onCreateDrawableState 9294 */ 9295 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 9296 final int N = baseState.length; 9297 int i = N - 1; 9298 while (i >= 0 && baseState[i] == 0) { 9299 i--; 9300 } 9301 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 9302 return baseState; 9303 } 9304 9305 /** 9306 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 9307 * on all Drawable objects associated with this view. 9308 */ 9309 public void jumpDrawablesToCurrentState() { 9310 if (mBGDrawable != null) { 9311 mBGDrawable.jumpToCurrentState(); 9312 } 9313 } 9314 9315 /** 9316 * Sets the background color for this view. 9317 * @param color the color of the background 9318 */ 9319 @RemotableViewMethod 9320 public void setBackgroundColor(int color) { 9321 if (mBGDrawable instanceof ColorDrawable) { 9322 ((ColorDrawable) mBGDrawable).setColor(color); 9323 } else { 9324 setBackgroundDrawable(new ColorDrawable(color)); 9325 } 9326 } 9327 9328 /** 9329 * Set the background to a given resource. The resource should refer to 9330 * a Drawable object or 0 to remove the background. 9331 * @param resid The identifier of the resource. 9332 * @attr ref android.R.styleable#View_background 9333 */ 9334 @RemotableViewMethod 9335 public void setBackgroundResource(int resid) { 9336 if (resid != 0 && resid == mBackgroundResource) { 9337 return; 9338 } 9339 9340 Drawable d= null; 9341 if (resid != 0) { 9342 d = mResources.getDrawable(resid); 9343 } 9344 setBackgroundDrawable(d); 9345 9346 mBackgroundResource = resid; 9347 } 9348 9349 /** 9350 * Set the background to a given Drawable, or remove the background. If the 9351 * background has padding, this View's padding is set to the background's 9352 * padding. However, when a background is removed, this View's padding isn't 9353 * touched. If setting the padding is desired, please use 9354 * {@link #setPadding(int, int, int, int)}. 9355 * 9356 * @param d The Drawable to use as the background, or null to remove the 9357 * background 9358 */ 9359 public void setBackgroundDrawable(Drawable d) { 9360 boolean requestLayout = false; 9361 9362 mBackgroundResource = 0; 9363 9364 /* 9365 * Regardless of whether we're setting a new background or not, we want 9366 * to clear the previous drawable. 9367 */ 9368 if (mBGDrawable != null) { 9369 mBGDrawable.setCallback(null); 9370 unscheduleDrawable(mBGDrawable); 9371 } 9372 9373 if (d != null) { 9374 Rect padding = sThreadLocal.get(); 9375 if (padding == null) { 9376 padding = new Rect(); 9377 sThreadLocal.set(padding); 9378 } 9379 if (d.getPadding(padding)) { 9380 setPadding(padding.left, padding.top, padding.right, padding.bottom); 9381 } 9382 9383 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 9384 // if it has a different minimum size, we should layout again 9385 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 9386 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 9387 requestLayout = true; 9388 } 9389 9390 d.setCallback(this); 9391 if (d.isStateful()) { 9392 d.setState(getDrawableState()); 9393 } 9394 d.setVisible(getVisibility() == VISIBLE, false); 9395 mBGDrawable = d; 9396 9397 if ((mPrivateFlags & SKIP_DRAW) != 0) { 9398 mPrivateFlags &= ~SKIP_DRAW; 9399 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 9400 requestLayout = true; 9401 } 9402 } else { 9403 /* Remove the background */ 9404 mBGDrawable = null; 9405 9406 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 9407 /* 9408 * This view ONLY drew the background before and we're removing 9409 * the background, so now it won't draw anything 9410 * (hence we SKIP_DRAW) 9411 */ 9412 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 9413 mPrivateFlags |= SKIP_DRAW; 9414 } 9415 9416 /* 9417 * When the background is set, we try to apply its padding to this 9418 * View. When the background is removed, we don't touch this View's 9419 * padding. This is noted in the Javadocs. Hence, we don't need to 9420 * requestLayout(), the invalidate() below is sufficient. 9421 */ 9422 9423 // The old background's minimum size could have affected this 9424 // View's layout, so let's requestLayout 9425 requestLayout = true; 9426 } 9427 9428 computeOpaqueFlags(); 9429 9430 if (requestLayout) { 9431 requestLayout(); 9432 } 9433 9434 mBackgroundSizeChanged = true; 9435 invalidate(); 9436 } 9437 9438 /** 9439 * Gets the background drawable 9440 * @return The drawable used as the background for this view, if any. 9441 */ 9442 public Drawable getBackground() { 9443 return mBGDrawable; 9444 } 9445 9446 /** 9447 * Sets the padding. The view may add on the space required to display 9448 * the scrollbars, depending on the style and visibility of the scrollbars. 9449 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 9450 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 9451 * from the values set in this call. 9452 * 9453 * @attr ref android.R.styleable#View_padding 9454 * @attr ref android.R.styleable#View_paddingBottom 9455 * @attr ref android.R.styleable#View_paddingLeft 9456 * @attr ref android.R.styleable#View_paddingRight 9457 * @attr ref android.R.styleable#View_paddingTop 9458 * @param left the left padding in pixels 9459 * @param top the top padding in pixels 9460 * @param right the right padding in pixels 9461 * @param bottom the bottom padding in pixels 9462 */ 9463 public void setPadding(int left, int top, int right, int bottom) { 9464 boolean changed = false; 9465 9466 mUserPaddingLeft = left; 9467 mUserPaddingRight = right; 9468 mUserPaddingBottom = bottom; 9469 9470 final int viewFlags = mViewFlags; 9471 9472 // Common case is there are no scroll bars. 9473 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 9474 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 9475 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 9476 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 9477 ? 0 : getVerticalScrollbarWidth(); 9478 switch (mVerticalScrollbarPosition) { 9479 case SCROLLBAR_POSITION_DEFAULT: 9480 case SCROLLBAR_POSITION_RIGHT: 9481 right += offset; 9482 break; 9483 case SCROLLBAR_POSITION_LEFT: 9484 left += offset; 9485 break; 9486 } 9487 } 9488 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 9489 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 9490 ? 0 : getHorizontalScrollbarHeight(); 9491 } 9492 } 9493 9494 if (mPaddingLeft != left) { 9495 changed = true; 9496 mPaddingLeft = left; 9497 } 9498 if (mPaddingTop != top) { 9499 changed = true; 9500 mPaddingTop = top; 9501 } 9502 if (mPaddingRight != right) { 9503 changed = true; 9504 mPaddingRight = right; 9505 } 9506 if (mPaddingBottom != bottom) { 9507 changed = true; 9508 mPaddingBottom = bottom; 9509 } 9510 9511 if (changed) { 9512 requestLayout(); 9513 } 9514 } 9515 9516 /** 9517 * Returns the top padding of this view. 9518 * 9519 * @return the top padding in pixels 9520 */ 9521 public int getPaddingTop() { 9522 return mPaddingTop; 9523 } 9524 9525 /** 9526 * Returns the bottom padding of this view. If there are inset and enabled 9527 * scrollbars, this value may include the space required to display the 9528 * scrollbars as well. 9529 * 9530 * @return the bottom padding in pixels 9531 */ 9532 public int getPaddingBottom() { 9533 return mPaddingBottom; 9534 } 9535 9536 /** 9537 * Returns the left padding of this view. If there are inset and enabled 9538 * scrollbars, this value may include the space required to display the 9539 * scrollbars as well. 9540 * 9541 * @return the left padding in pixels 9542 */ 9543 public int getPaddingLeft() { 9544 return mPaddingLeft; 9545 } 9546 9547 /** 9548 * Returns the right padding of this view. If there are inset and enabled 9549 * scrollbars, this value may include the space required to display the 9550 * scrollbars as well. 9551 * 9552 * @return the right padding in pixels 9553 */ 9554 public int getPaddingRight() { 9555 return mPaddingRight; 9556 } 9557 9558 /** 9559 * Changes the selection state of this view. A view can be selected or not. 9560 * Note that selection is not the same as focus. Views are typically 9561 * selected in the context of an AdapterView like ListView or GridView; 9562 * the selected view is the view that is highlighted. 9563 * 9564 * @param selected true if the view must be selected, false otherwise 9565 */ 9566 public void setSelected(boolean selected) { 9567 if (((mPrivateFlags & SELECTED) != 0) != selected) { 9568 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 9569 if (!selected) resetPressedState(); 9570 invalidate(); 9571 refreshDrawableState(); 9572 dispatchSetSelected(selected); 9573 } 9574 } 9575 9576 /** 9577 * Dispatch setSelected to all of this View's children. 9578 * 9579 * @see #setSelected(boolean) 9580 * 9581 * @param selected The new selected state 9582 */ 9583 protected void dispatchSetSelected(boolean selected) { 9584 } 9585 9586 /** 9587 * Indicates the selection state of this view. 9588 * 9589 * @return true if the view is selected, false otherwise 9590 */ 9591 @ViewDebug.ExportedProperty 9592 public boolean isSelected() { 9593 return (mPrivateFlags & SELECTED) != 0; 9594 } 9595 9596 /** 9597 * Changes the activated state of this view. A view can be activated or not. 9598 * Note that activation is not the same as selection. Selection is 9599 * a transient property, representing the view (hierarchy) the user is 9600 * currently interacting with. Activation is a longer-term state that the 9601 * user can move views in and out of. For example, in a list view with 9602 * single or multiple selection enabled, the views in the current selection 9603 * set are activated. (Um, yeah, we are deeply sorry about the terminology 9604 * here.) The activated state is propagated down to children of the view it 9605 * is set on. 9606 * 9607 * @param activated true if the view must be activated, false otherwise 9608 */ 9609 public void setActivated(boolean activated) { 9610 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 9611 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 9612 invalidate(); 9613 refreshDrawableState(); 9614 dispatchSetActivated(activated); 9615 } 9616 } 9617 9618 /** 9619 * Dispatch setActivated to all of this View's children. 9620 * 9621 * @see #setActivated(boolean) 9622 * 9623 * @param activated The new activated state 9624 */ 9625 protected void dispatchSetActivated(boolean activated) { 9626 } 9627 9628 /** 9629 * Indicates the activation state of this view. 9630 * 9631 * @return true if the view is activated, false otherwise 9632 */ 9633 @ViewDebug.ExportedProperty 9634 public boolean isActivated() { 9635 return (mPrivateFlags & ACTIVATED) != 0; 9636 } 9637 9638 /** 9639 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 9640 * observer can be used to get notifications when global events, like 9641 * layout, happen. 9642 * 9643 * The returned ViewTreeObserver observer is not guaranteed to remain 9644 * valid for the lifetime of this View. If the caller of this method keeps 9645 * a long-lived reference to ViewTreeObserver, it should always check for 9646 * the return value of {@link ViewTreeObserver#isAlive()}. 9647 * 9648 * @return The ViewTreeObserver for this view's hierarchy. 9649 */ 9650 public ViewTreeObserver getViewTreeObserver() { 9651 if (mAttachInfo != null) { 9652 return mAttachInfo.mTreeObserver; 9653 } 9654 if (mFloatingTreeObserver == null) { 9655 mFloatingTreeObserver = new ViewTreeObserver(); 9656 } 9657 return mFloatingTreeObserver; 9658 } 9659 9660 /** 9661 * <p>Finds the topmost view in the current view hierarchy.</p> 9662 * 9663 * @return the topmost view containing this view 9664 */ 9665 public View getRootView() { 9666 if (mAttachInfo != null) { 9667 final View v = mAttachInfo.mRootView; 9668 if (v != null) { 9669 return v; 9670 } 9671 } 9672 9673 View parent = this; 9674 9675 while (parent.mParent != null && parent.mParent instanceof View) { 9676 parent = (View) parent.mParent; 9677 } 9678 9679 return parent; 9680 } 9681 9682 /** 9683 * <p>Computes the coordinates of this view on the screen. The argument 9684 * must be an array of two integers. After the method returns, the array 9685 * contains the x and y location in that order.</p> 9686 * 9687 * @param location an array of two integers in which to hold the coordinates 9688 */ 9689 public void getLocationOnScreen(int[] location) { 9690 getLocationInWindow(location); 9691 9692 final AttachInfo info = mAttachInfo; 9693 if (info != null) { 9694 location[0] += info.mWindowLeft; 9695 location[1] += info.mWindowTop; 9696 } 9697 } 9698 9699 /** 9700 * <p>Computes the coordinates of this view in its window. The argument 9701 * must be an array of two integers. After the method returns, the array 9702 * contains the x and y location in that order.</p> 9703 * 9704 * @param location an array of two integers in which to hold the coordinates 9705 */ 9706 public void getLocationInWindow(int[] location) { 9707 if (location == null || location.length < 2) { 9708 throw new IllegalArgumentException("location must be an array of " 9709 + "two integers"); 9710 } 9711 9712 location[0] = mLeft + (int) (mTranslationX + 0.5f); 9713 location[1] = mTop + (int) (mTranslationY + 0.5f); 9714 9715 ViewParent viewParent = mParent; 9716 while (viewParent instanceof View) { 9717 final View view = (View)viewParent; 9718 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 9719 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 9720 viewParent = view.mParent; 9721 } 9722 9723 if (viewParent instanceof ViewRoot) { 9724 // *cough* 9725 final ViewRoot vr = (ViewRoot)viewParent; 9726 location[1] -= vr.mCurScrollY; 9727 } 9728 } 9729 9730 /** 9731 * {@hide} 9732 * @param id the id of the view to be found 9733 * @return the view of the specified id, null if cannot be found 9734 */ 9735 protected View findViewTraversal(int id) { 9736 if (id == mID) { 9737 return this; 9738 } 9739 return null; 9740 } 9741 9742 /** 9743 * {@hide} 9744 * @param tag the tag of the view to be found 9745 * @return the view of specified tag, null if cannot be found 9746 */ 9747 protected View findViewWithTagTraversal(Object tag) { 9748 if (tag != null && tag.equals(mTag)) { 9749 return this; 9750 } 9751 return null; 9752 } 9753 9754 /** 9755 * {@hide} 9756 * @param predicate The predicate to evaluate. 9757 * @return The first view that matches the predicate or null. 9758 */ 9759 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 9760 if (predicate.apply(this)) { 9761 return this; 9762 } 9763 return null; 9764 } 9765 9766 /** 9767 * Look for a child view with the given id. If this view has the given 9768 * id, return this view. 9769 * 9770 * @param id The id to search for. 9771 * @return The view that has the given id in the hierarchy or null 9772 */ 9773 public final View findViewById(int id) { 9774 if (id < 0) { 9775 return null; 9776 } 9777 return findViewTraversal(id); 9778 } 9779 9780 /** 9781 * Look for a child view with the given tag. If this view has the given 9782 * tag, return this view. 9783 * 9784 * @param tag The tag to search for, using "tag.equals(getTag())". 9785 * @return The View that has the given tag in the hierarchy or null 9786 */ 9787 public final View findViewWithTag(Object tag) { 9788 if (tag == null) { 9789 return null; 9790 } 9791 return findViewWithTagTraversal(tag); 9792 } 9793 9794 /** 9795 * {@hide} 9796 * Look for a child view that matches the specified predicate. 9797 * If this view matches the predicate, return this view. 9798 * 9799 * @param predicate The predicate to evaluate. 9800 * @return The first view that matches the predicate or null. 9801 */ 9802 public final View findViewByPredicate(Predicate<View> predicate) { 9803 return findViewByPredicateTraversal(predicate); 9804 } 9805 9806 /** 9807 * Sets the identifier for this view. The identifier does not have to be 9808 * unique in this view's hierarchy. The identifier should be a positive 9809 * number. 9810 * 9811 * @see #NO_ID 9812 * @see #getId 9813 * @see #findViewById 9814 * 9815 * @param id a number used to identify the view 9816 * 9817 * @attr ref android.R.styleable#View_id 9818 */ 9819 public void setId(int id) { 9820 mID = id; 9821 } 9822 9823 /** 9824 * {@hide} 9825 * 9826 * @param isRoot true if the view belongs to the root namespace, false 9827 * otherwise 9828 */ 9829 public void setIsRootNamespace(boolean isRoot) { 9830 if (isRoot) { 9831 mPrivateFlags |= IS_ROOT_NAMESPACE; 9832 } else { 9833 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 9834 } 9835 } 9836 9837 /** 9838 * {@hide} 9839 * 9840 * @return true if the view belongs to the root namespace, false otherwise 9841 */ 9842 public boolean isRootNamespace() { 9843 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 9844 } 9845 9846 /** 9847 * Returns this view's identifier. 9848 * 9849 * @return a positive integer used to identify the view or {@link #NO_ID} 9850 * if the view has no ID 9851 * 9852 * @see #setId 9853 * @see #findViewById 9854 * @attr ref android.R.styleable#View_id 9855 */ 9856 @ViewDebug.CapturedViewProperty 9857 public int getId() { 9858 return mID; 9859 } 9860 9861 /** 9862 * Returns this view's tag. 9863 * 9864 * @return the Object stored in this view as a tag 9865 * 9866 * @see #setTag(Object) 9867 * @see #getTag(int) 9868 */ 9869 @ViewDebug.ExportedProperty 9870 public Object getTag() { 9871 return mTag; 9872 } 9873 9874 /** 9875 * Sets the tag associated with this view. A tag can be used to mark 9876 * a view in its hierarchy and does not have to be unique within the 9877 * hierarchy. Tags can also be used to store data within a view without 9878 * resorting to another data structure. 9879 * 9880 * @param tag an Object to tag the view with 9881 * 9882 * @see #getTag() 9883 * @see #setTag(int, Object) 9884 */ 9885 public void setTag(final Object tag) { 9886 mTag = tag; 9887 } 9888 9889 /** 9890 * Returns the tag associated with this view and the specified key. 9891 * 9892 * @param key The key identifying the tag 9893 * 9894 * @return the Object stored in this view as a tag 9895 * 9896 * @see #setTag(int, Object) 9897 * @see #getTag() 9898 */ 9899 public Object getTag(int key) { 9900 SparseArray<Object> tags = null; 9901 synchronized (sTagsLock) { 9902 if (sTags != null) { 9903 tags = sTags.get(this); 9904 } 9905 } 9906 9907 if (tags != null) return tags.get(key); 9908 return null; 9909 } 9910 9911 /** 9912 * Sets a tag associated with this view and a key. A tag can be used 9913 * to mark a view in its hierarchy and does not have to be unique within 9914 * the hierarchy. Tags can also be used to store data within a view 9915 * without resorting to another data structure. 9916 * 9917 * The specified key should be an id declared in the resources of the 9918 * application to ensure it is unique (see the <a 9919 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 9920 * Keys identified as belonging to 9921 * the Android framework or not associated with any package will cause 9922 * an {@link IllegalArgumentException} to be thrown. 9923 * 9924 * @param key The key identifying the tag 9925 * @param tag An Object to tag the view with 9926 * 9927 * @throws IllegalArgumentException If they specified key is not valid 9928 * 9929 * @see #setTag(Object) 9930 * @see #getTag(int) 9931 */ 9932 public void setTag(int key, final Object tag) { 9933 // If the package id is 0x00 or 0x01, it's either an undefined package 9934 // or a framework id 9935 if ((key >>> 24) < 2) { 9936 throw new IllegalArgumentException("The key must be an application-specific " 9937 + "resource id."); 9938 } 9939 9940 setTagInternal(this, key, tag); 9941 } 9942 9943 /** 9944 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 9945 * framework id. 9946 * 9947 * @hide 9948 */ 9949 public void setTagInternal(int key, Object tag) { 9950 if ((key >>> 24) != 0x1) { 9951 throw new IllegalArgumentException("The key must be a framework-specific " 9952 + "resource id."); 9953 } 9954 9955 setTagInternal(this, key, tag); 9956 } 9957 9958 private static void setTagInternal(View view, int key, Object tag) { 9959 SparseArray<Object> tags = null; 9960 synchronized (sTagsLock) { 9961 if (sTags == null) { 9962 sTags = new WeakHashMap<View, SparseArray<Object>>(); 9963 } else { 9964 tags = sTags.get(view); 9965 } 9966 } 9967 9968 if (tags == null) { 9969 tags = new SparseArray<Object>(2); 9970 synchronized (sTagsLock) { 9971 sTags.put(view, tags); 9972 } 9973 } 9974 9975 tags.put(key, tag); 9976 } 9977 9978 /** 9979 * @param consistency The type of consistency. See ViewDebug for more information. 9980 * 9981 * @hide 9982 */ 9983 protected boolean dispatchConsistencyCheck(int consistency) { 9984 return onConsistencyCheck(consistency); 9985 } 9986 9987 /** 9988 * Method that subclasses should implement to check their consistency. The type of 9989 * consistency check is indicated by the bit field passed as a parameter. 9990 * 9991 * @param consistency The type of consistency. See ViewDebug for more information. 9992 * 9993 * @throws IllegalStateException if the view is in an inconsistent state. 9994 * 9995 * @hide 9996 */ 9997 protected boolean onConsistencyCheck(int consistency) { 9998 boolean result = true; 9999 10000 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 10001 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 10002 10003 if (checkLayout) { 10004 if (getParent() == null) { 10005 result = false; 10006 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10007 "View " + this + " does not have a parent."); 10008 } 10009 10010 if (mAttachInfo == null) { 10011 result = false; 10012 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10013 "View " + this + " is not attached to a window."); 10014 } 10015 } 10016 10017 if (checkDrawing) { 10018 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 10019 // from their draw() method 10020 10021 if ((mPrivateFlags & DRAWN) != DRAWN && 10022 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 10023 result = false; 10024 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10025 "View " + this + " was invalidated but its drawing cache is valid."); 10026 } 10027 } 10028 10029 return result; 10030 } 10031 10032 /** 10033 * Prints information about this view in the log output, with the tag 10034 * {@link #VIEW_LOG_TAG}. 10035 * 10036 * @hide 10037 */ 10038 public void debug() { 10039 debug(0); 10040 } 10041 10042 /** 10043 * Prints information about this view in the log output, with the tag 10044 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 10045 * indentation defined by the <code>depth</code>. 10046 * 10047 * @param depth the indentation level 10048 * 10049 * @hide 10050 */ 10051 protected void debug(int depth) { 10052 String output = debugIndent(depth - 1); 10053 10054 output += "+ " + this; 10055 int id = getId(); 10056 if (id != -1) { 10057 output += " (id=" + id + ")"; 10058 } 10059 Object tag = getTag(); 10060 if (tag != null) { 10061 output += " (tag=" + tag + ")"; 10062 } 10063 Log.d(VIEW_LOG_TAG, output); 10064 10065 if ((mPrivateFlags & FOCUSED) != 0) { 10066 output = debugIndent(depth) + " FOCUSED"; 10067 Log.d(VIEW_LOG_TAG, output); 10068 } 10069 10070 output = debugIndent(depth); 10071 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 10072 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 10073 + "} "; 10074 Log.d(VIEW_LOG_TAG, output); 10075 10076 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 10077 || mPaddingBottom != 0) { 10078 output = debugIndent(depth); 10079 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 10080 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 10081 Log.d(VIEW_LOG_TAG, output); 10082 } 10083 10084 output = debugIndent(depth); 10085 output += "mMeasureWidth=" + mMeasuredWidth + 10086 " mMeasureHeight=" + mMeasuredHeight; 10087 Log.d(VIEW_LOG_TAG, output); 10088 10089 output = debugIndent(depth); 10090 if (mLayoutParams == null) { 10091 output += "BAD! no layout params"; 10092 } else { 10093 output = mLayoutParams.debug(output); 10094 } 10095 Log.d(VIEW_LOG_TAG, output); 10096 10097 output = debugIndent(depth); 10098 output += "flags={"; 10099 output += View.printFlags(mViewFlags); 10100 output += "}"; 10101 Log.d(VIEW_LOG_TAG, output); 10102 10103 output = debugIndent(depth); 10104 output += "privateFlags={"; 10105 output += View.printPrivateFlags(mPrivateFlags); 10106 output += "}"; 10107 Log.d(VIEW_LOG_TAG, output); 10108 } 10109 10110 /** 10111 * Creates an string of whitespaces used for indentation. 10112 * 10113 * @param depth the indentation level 10114 * @return a String containing (depth * 2 + 3) * 2 white spaces 10115 * 10116 * @hide 10117 */ 10118 protected static String debugIndent(int depth) { 10119 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 10120 for (int i = 0; i < (depth * 2) + 3; i++) { 10121 spaces.append(' ').append(' '); 10122 } 10123 return spaces.toString(); 10124 } 10125 10126 /** 10127 * <p>Return the offset of the widget's text baseline from the widget's top 10128 * boundary. If this widget does not support baseline alignment, this 10129 * method returns -1. </p> 10130 * 10131 * @return the offset of the baseline within the widget's bounds or -1 10132 * if baseline alignment is not supported 10133 */ 10134 @ViewDebug.ExportedProperty(category = "layout") 10135 public int getBaseline() { 10136 return -1; 10137 } 10138 10139 /** 10140 * Call this when something has changed which has invalidated the 10141 * layout of this view. This will schedule a layout pass of the view 10142 * tree. 10143 */ 10144 public void requestLayout() { 10145 if (ViewDebug.TRACE_HIERARCHY) { 10146 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 10147 } 10148 10149 mPrivateFlags |= FORCE_LAYOUT; 10150 10151 if (mParent != null && !mParent.isLayoutRequested()) { 10152 mParent.requestLayout(); 10153 } 10154 } 10155 10156 /** 10157 * Forces this view to be laid out during the next layout pass. 10158 * This method does not call requestLayout() or forceLayout() 10159 * on the parent. 10160 */ 10161 public void forceLayout() { 10162 mPrivateFlags |= FORCE_LAYOUT; 10163 } 10164 10165 /** 10166 * <p> 10167 * This is called to find out how big a view should be. The parent 10168 * supplies constraint information in the width and height parameters. 10169 * </p> 10170 * 10171 * <p> 10172 * The actual mesurement work of a view is performed in 10173 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 10174 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 10175 * </p> 10176 * 10177 * 10178 * @param widthMeasureSpec Horizontal space requirements as imposed by the 10179 * parent 10180 * @param heightMeasureSpec Vertical space requirements as imposed by the 10181 * parent 10182 * 10183 * @see #onMeasure(int, int) 10184 */ 10185 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 10186 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 10187 widthMeasureSpec != mOldWidthMeasureSpec || 10188 heightMeasureSpec != mOldHeightMeasureSpec) { 10189 10190 // first clears the measured dimension flag 10191 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 10192 10193 if (ViewDebug.TRACE_HIERARCHY) { 10194 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 10195 } 10196 10197 // measure ourselves, this should set the measured dimension flag back 10198 onMeasure(widthMeasureSpec, heightMeasureSpec); 10199 10200 // flag not set, setMeasuredDimension() was not invoked, we raise 10201 // an exception to warn the developer 10202 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 10203 throw new IllegalStateException("onMeasure() did not set the" 10204 + " measured dimension by calling" 10205 + " setMeasuredDimension()"); 10206 } 10207 10208 mPrivateFlags |= LAYOUT_REQUIRED; 10209 } 10210 10211 mOldWidthMeasureSpec = widthMeasureSpec; 10212 mOldHeightMeasureSpec = heightMeasureSpec; 10213 } 10214 10215 /** 10216 * <p> 10217 * Measure the view and its content to determine the measured width and the 10218 * measured height. This method is invoked by {@link #measure(int, int)} and 10219 * should be overriden by subclasses to provide accurate and efficient 10220 * measurement of their contents. 10221 * </p> 10222 * 10223 * <p> 10224 * <strong>CONTRACT:</strong> When overriding this method, you 10225 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 10226 * measured width and height of this view. Failure to do so will trigger an 10227 * <code>IllegalStateException</code>, thrown by 10228 * {@link #measure(int, int)}. Calling the superclass' 10229 * {@link #onMeasure(int, int)} is a valid use. 10230 * </p> 10231 * 10232 * <p> 10233 * The base class implementation of measure defaults to the background size, 10234 * unless a larger size is allowed by the MeasureSpec. Subclasses should 10235 * override {@link #onMeasure(int, int)} to provide better measurements of 10236 * their content. 10237 * </p> 10238 * 10239 * <p> 10240 * If this method is overridden, it is the subclass's responsibility to make 10241 * sure the measured height and width are at least the view's minimum height 10242 * and width ({@link #getSuggestedMinimumHeight()} and 10243 * {@link #getSuggestedMinimumWidth()}). 10244 * </p> 10245 * 10246 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 10247 * The requirements are encoded with 10248 * {@link android.view.View.MeasureSpec}. 10249 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 10250 * The requirements are encoded with 10251 * {@link android.view.View.MeasureSpec}. 10252 * 10253 * @see #getMeasuredWidth() 10254 * @see #getMeasuredHeight() 10255 * @see #setMeasuredDimension(int, int) 10256 * @see #getSuggestedMinimumHeight() 10257 * @see #getSuggestedMinimumWidth() 10258 * @see android.view.View.MeasureSpec#getMode(int) 10259 * @see android.view.View.MeasureSpec#getSize(int) 10260 */ 10261 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 10262 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 10263 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 10264 } 10265 10266 /** 10267 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 10268 * measured width and measured height. Failing to do so will trigger an 10269 * exception at measurement time.</p> 10270 * 10271 * @param measuredWidth The measured width of this view. May be a complex 10272 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10273 * {@link #MEASURED_STATE_TOO_SMALL}. 10274 * @param measuredHeight The measured height of this view. May be a complex 10275 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10276 * {@link #MEASURED_STATE_TOO_SMALL}. 10277 */ 10278 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 10279 mMeasuredWidth = measuredWidth; 10280 mMeasuredHeight = measuredHeight; 10281 10282 mPrivateFlags |= MEASURED_DIMENSION_SET; 10283 } 10284 10285 /** 10286 * Merge two states as returned by {@link #getMeasuredState()}. 10287 * @param curState The current state as returned from a view or the result 10288 * of combining multiple views. 10289 * @param newState The new view state to combine. 10290 * @return Returns a new integer reflecting the combination of the two 10291 * states. 10292 */ 10293 public static int combineMeasuredStates(int curState, int newState) { 10294 return curState | newState; 10295 } 10296 10297 /** 10298 * Version of {@link #resolveSizeAndState(int, int, int)} 10299 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 10300 */ 10301 public static int resolveSize(int size, int measureSpec) { 10302 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 10303 } 10304 10305 /** 10306 * Utility to reconcile a desired size and state, with constraints imposed 10307 * by a MeasureSpec. Will take the desired size, unless a different size 10308 * is imposed by the constraints. The returned value is a compound integer, 10309 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 10310 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 10311 * size is smaller than the size the view wants to be. 10312 * 10313 * @param size How big the view wants to be 10314 * @param measureSpec Constraints imposed by the parent 10315 * @return Size information bit mask as defined by 10316 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 10317 */ 10318 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 10319 int result = size; 10320 int specMode = MeasureSpec.getMode(measureSpec); 10321 int specSize = MeasureSpec.getSize(measureSpec); 10322 switch (specMode) { 10323 case MeasureSpec.UNSPECIFIED: 10324 result = size; 10325 break; 10326 case MeasureSpec.AT_MOST: 10327 if (specSize < size) { 10328 result = specSize | MEASURED_STATE_TOO_SMALL; 10329 } else { 10330 result = size; 10331 } 10332 break; 10333 case MeasureSpec.EXACTLY: 10334 result = specSize; 10335 break; 10336 } 10337 return result | (childMeasuredState&MEASURED_STATE_MASK); 10338 } 10339 10340 /** 10341 * Utility to return a default size. Uses the supplied size if the 10342 * MeasureSpec imposed no contraints. Will get larger if allowed 10343 * by the MeasureSpec. 10344 * 10345 * @param size Default size for this view 10346 * @param measureSpec Constraints imposed by the parent 10347 * @return The size this view should be. 10348 */ 10349 public static int getDefaultSize(int size, int measureSpec) { 10350 int result = size; 10351 int specMode = MeasureSpec.getMode(measureSpec); 10352 int specSize = MeasureSpec.getSize(measureSpec); 10353 10354 switch (specMode) { 10355 case MeasureSpec.UNSPECIFIED: 10356 result = size; 10357 break; 10358 case MeasureSpec.AT_MOST: 10359 case MeasureSpec.EXACTLY: 10360 result = specSize; 10361 break; 10362 } 10363 return result; 10364 } 10365 10366 /** 10367 * Returns the suggested minimum height that the view should use. This 10368 * returns the maximum of the view's minimum height 10369 * and the background's minimum height 10370 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 10371 * <p> 10372 * When being used in {@link #onMeasure(int, int)}, the caller should still 10373 * ensure the returned height is within the requirements of the parent. 10374 * 10375 * @return The suggested minimum height of the view. 10376 */ 10377 protected int getSuggestedMinimumHeight() { 10378 int suggestedMinHeight = mMinHeight; 10379 10380 if (mBGDrawable != null) { 10381 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 10382 if (suggestedMinHeight < bgMinHeight) { 10383 suggestedMinHeight = bgMinHeight; 10384 } 10385 } 10386 10387 return suggestedMinHeight; 10388 } 10389 10390 /** 10391 * Returns the suggested minimum width that the view should use. This 10392 * returns the maximum of the view's minimum width) 10393 * and the background's minimum width 10394 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 10395 * <p> 10396 * When being used in {@link #onMeasure(int, int)}, the caller should still 10397 * ensure the returned width is within the requirements of the parent. 10398 * 10399 * @return The suggested minimum width of the view. 10400 */ 10401 protected int getSuggestedMinimumWidth() { 10402 int suggestedMinWidth = mMinWidth; 10403 10404 if (mBGDrawable != null) { 10405 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 10406 if (suggestedMinWidth < bgMinWidth) { 10407 suggestedMinWidth = bgMinWidth; 10408 } 10409 } 10410 10411 return suggestedMinWidth; 10412 } 10413 10414 /** 10415 * Sets the minimum height of the view. It is not guaranteed the view will 10416 * be able to achieve this minimum height (for example, if its parent layout 10417 * constrains it with less available height). 10418 * 10419 * @param minHeight The minimum height the view will try to be. 10420 */ 10421 public void setMinimumHeight(int minHeight) { 10422 mMinHeight = minHeight; 10423 } 10424 10425 /** 10426 * Sets the minimum width of the view. It is not guaranteed the view will 10427 * be able to achieve this minimum width (for example, if its parent layout 10428 * constrains it with less available width). 10429 * 10430 * @param minWidth The minimum width the view will try to be. 10431 */ 10432 public void setMinimumWidth(int minWidth) { 10433 mMinWidth = minWidth; 10434 } 10435 10436 /** 10437 * Get the animation currently associated with this view. 10438 * 10439 * @return The animation that is currently playing or 10440 * scheduled to play for this view. 10441 */ 10442 public Animation getAnimation() { 10443 return mCurrentAnimation; 10444 } 10445 10446 /** 10447 * Start the specified animation now. 10448 * 10449 * @param animation the animation to start now 10450 */ 10451 public void startAnimation(Animation animation) { 10452 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 10453 setAnimation(animation); 10454 invalidate(); 10455 } 10456 10457 /** 10458 * Cancels any animations for this view. 10459 */ 10460 public void clearAnimation() { 10461 if (mCurrentAnimation != null) { 10462 mCurrentAnimation.detach(); 10463 } 10464 mCurrentAnimation = null; 10465 } 10466 10467 /** 10468 * Sets the next animation to play for this view. 10469 * If you want the animation to play immediately, use 10470 * startAnimation. This method provides allows fine-grained 10471 * control over the start time and invalidation, but you 10472 * must make sure that 1) the animation has a start time set, and 10473 * 2) the view will be invalidated when the animation is supposed to 10474 * start. 10475 * 10476 * @param animation The next animation, or null. 10477 */ 10478 public void setAnimation(Animation animation) { 10479 mCurrentAnimation = animation; 10480 if (animation != null) { 10481 animation.reset(); 10482 } 10483 } 10484 10485 /** 10486 * Invoked by a parent ViewGroup to notify the start of the animation 10487 * currently associated with this view. If you override this method, 10488 * always call super.onAnimationStart(); 10489 * 10490 * @see #setAnimation(android.view.animation.Animation) 10491 * @see #getAnimation() 10492 */ 10493 protected void onAnimationStart() { 10494 mPrivateFlags |= ANIMATION_STARTED; 10495 } 10496 10497 /** 10498 * Invoked by a parent ViewGroup to notify the end of the animation 10499 * currently associated with this view. If you override this method, 10500 * always call super.onAnimationEnd(); 10501 * 10502 * @see #setAnimation(android.view.animation.Animation) 10503 * @see #getAnimation() 10504 */ 10505 protected void onAnimationEnd() { 10506 mPrivateFlags &= ~ANIMATION_STARTED; 10507 } 10508 10509 /** 10510 * Invoked if there is a Transform that involves alpha. Subclass that can 10511 * draw themselves with the specified alpha should return true, and then 10512 * respect that alpha when their onDraw() is called. If this returns false 10513 * then the view may be redirected to draw into an offscreen buffer to 10514 * fulfill the request, which will look fine, but may be slower than if the 10515 * subclass handles it internally. The default implementation returns false. 10516 * 10517 * @param alpha The alpha (0..255) to apply to the view's drawing 10518 * @return true if the view can draw with the specified alpha. 10519 */ 10520 protected boolean onSetAlpha(int alpha) { 10521 return false; 10522 } 10523 10524 /** 10525 * This is used by the RootView to perform an optimization when 10526 * the view hierarchy contains one or several SurfaceView. 10527 * SurfaceView is always considered transparent, but its children are not, 10528 * therefore all View objects remove themselves from the global transparent 10529 * region (passed as a parameter to this function). 10530 * 10531 * @param region The transparent region for this ViewRoot (window). 10532 * 10533 * @return Returns true if the effective visibility of the view at this 10534 * point is opaque, regardless of the transparent region; returns false 10535 * if it is possible for underlying windows to be seen behind the view. 10536 * 10537 * {@hide} 10538 */ 10539 public boolean gatherTransparentRegion(Region region) { 10540 final AttachInfo attachInfo = mAttachInfo; 10541 if (region != null && attachInfo != null) { 10542 final int pflags = mPrivateFlags; 10543 if ((pflags & SKIP_DRAW) == 0) { 10544 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 10545 // remove it from the transparent region. 10546 final int[] location = attachInfo.mTransparentLocation; 10547 getLocationInWindow(location); 10548 region.op(location[0], location[1], location[0] + mRight - mLeft, 10549 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 10550 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 10551 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 10552 // exists, so we remove the background drawable's non-transparent 10553 // parts from this transparent region. 10554 applyDrawableToTransparentRegion(mBGDrawable, region); 10555 } 10556 } 10557 return true; 10558 } 10559 10560 /** 10561 * Play a sound effect for this view. 10562 * 10563 * <p>The framework will play sound effects for some built in actions, such as 10564 * clicking, but you may wish to play these effects in your widget, 10565 * for instance, for internal navigation. 10566 * 10567 * <p>The sound effect will only be played if sound effects are enabled by the user, and 10568 * {@link #isSoundEffectsEnabled()} is true. 10569 * 10570 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 10571 */ 10572 public void playSoundEffect(int soundConstant) { 10573 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 10574 return; 10575 } 10576 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 10577 } 10578 10579 /** 10580 * BZZZTT!!1! 10581 * 10582 * <p>Provide haptic feedback to the user for this view. 10583 * 10584 * <p>The framework will provide haptic feedback for some built in actions, 10585 * such as long presses, but you may wish to provide feedback for your 10586 * own widget. 10587 * 10588 * <p>The feedback will only be performed if 10589 * {@link #isHapticFeedbackEnabled()} is true. 10590 * 10591 * @param feedbackConstant One of the constants defined in 10592 * {@link HapticFeedbackConstants} 10593 */ 10594 public boolean performHapticFeedback(int feedbackConstant) { 10595 return performHapticFeedback(feedbackConstant, 0); 10596 } 10597 10598 /** 10599 * BZZZTT!!1! 10600 * 10601 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 10602 * 10603 * @param feedbackConstant One of the constants defined in 10604 * {@link HapticFeedbackConstants} 10605 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 10606 */ 10607 public boolean performHapticFeedback(int feedbackConstant, int flags) { 10608 if (mAttachInfo == null) { 10609 return false; 10610 } 10611 //noinspection SimplifiableIfStatement 10612 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 10613 && !isHapticFeedbackEnabled()) { 10614 return false; 10615 } 10616 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 10617 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 10618 } 10619 10620 /** 10621 * !!! TODO: real docs 10622 * 10623 * The base class implementation makes the shadow the same size and appearance 10624 * as the view itself, and positions it with its center at the touch point. 10625 */ 10626 public static class DragShadowBuilder { 10627 private final WeakReference<View> mView; 10628 10629 /** 10630 * Construct a shadow builder object for use with the given View object. The 10631 * default implementation will construct a drag shadow the same size and 10632 * appearance as the supplied View. 10633 * 10634 * @param view A view within the application's layout whose appearance 10635 * should be replicated as the drag shadow. 10636 */ 10637 public DragShadowBuilder(View view) { 10638 mView = new WeakReference<View>(view); 10639 } 10640 10641 /** 10642 * Construct a shadow builder object with no associated View. This 10643 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 10644 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 10645 * to supply the drag shadow's dimensions and appearance without 10646 * reference to any View object. 10647 */ 10648 public DragShadowBuilder() { 10649 mView = new WeakReference<View>(null); 10650 } 10651 10652 /** 10653 * Returns the View object that had been passed to the 10654 * {@link #View.DragShadowBuilder(View)} 10655 * constructor. If that View parameter was {@code null} or if the 10656 * {@link #View.DragShadowBuilder()} 10657 * constructor was used to instantiate the builder object, this method will return 10658 * null. 10659 * 10660 * @return The View object associate with this builder object. 10661 */ 10662 final public View getView() { 10663 return mView.get(); 10664 } 10665 10666 /** 10667 * Provide the draggable-shadow metrics for the operation: the dimensions of 10668 * the shadow image itself, and the point within that shadow that should 10669 * be centered under the touch location while dragging. 10670 * <p> 10671 * The default implementation sets the dimensions of the shadow to be the 10672 * same as the dimensions of the View object that had been supplied to the 10673 * {@link #View.DragShadowBuilder(View)} constructor 10674 * when the builder object was instantiated, and centers the shadow under the touch 10675 * point. 10676 * 10677 * @param shadowSize The application should set the {@code x} member of this 10678 * parameter to the desired shadow width, and the {@code y} member to 10679 * the desired height. 10680 * @param shadowTouchPoint The application should set this point to be the 10681 * location within the shadow that should track directly underneath 10682 * the touch point on the screen during a drag. 10683 */ 10684 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 10685 final View view = mView.get(); 10686 if (view != null) { 10687 shadowSize.set(view.getWidth(), view.getHeight()); 10688 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 10689 } else { 10690 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 10691 } 10692 } 10693 10694 /** 10695 * Draw the shadow image for the upcoming drag. The shadow canvas was 10696 * created with the dimensions supplied by the 10697 * {@link #onProvideShadowMetrics(Point, Point)} callback. 10698 * <p> 10699 * The default implementation replicates the appearance of the View object 10700 * that had been supplied to the 10701 * {@link #View.DragShadowBuilder(View)} 10702 * constructor when the builder object was instantiated. 10703 * 10704 * @param canvas 10705 */ 10706 public void onDrawShadow(Canvas canvas) { 10707 final View view = mView.get(); 10708 if (view != null) { 10709 view.draw(canvas); 10710 } else { 10711 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 10712 } 10713 } 10714 } 10715 10716 /** 10717 * Drag and drop. App calls startDrag(), then callbacks to the shadow builder's 10718 * {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} and 10719 * {@link DragShadowBuilder#onDrawShadow(Canvas)} methods happen, then the drag 10720 * operation is handed over to the OS. 10721 * !!! TODO: real docs 10722 * 10723 * @param data !!! TODO 10724 * @param shadowBuilder !!! TODO 10725 * @param myLocalState An arbitrary object that will be passed as part of every DragEvent 10726 * delivered to the calling application during the course of the current drag operation. 10727 * This object is private to the application that called startDrag(), and is not 10728 * visible to other applications. It provides a lightweight way for the application to 10729 * propagate information from the initiator to the recipient of a drag within its own 10730 * application; for example, to help disambiguate between 'copy' and 'move' semantics. 10731 * @param flags Flags affecting the drag operation. At present no flags are defined; 10732 * pass 0 for this parameter. 10733 * @return {@code true} if the drag operation was initiated successfully; {@code false} if 10734 * an error prevented the drag from taking place. 10735 */ 10736 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 10737 Object myLocalState, int flags) { 10738 if (ViewDebug.DEBUG_DRAG) { 10739 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 10740 } 10741 boolean okay = false; 10742 10743 Point shadowSize = new Point(); 10744 Point shadowTouchPoint = new Point(); 10745 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 10746 10747 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 10748 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 10749 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 10750 } 10751 10752 if (ViewDebug.DEBUG_DRAG) { 10753 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 10754 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 10755 } 10756 Surface surface = new Surface(); 10757 try { 10758 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 10759 flags, shadowSize.x, shadowSize.y, surface); 10760 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 10761 + " surface=" + surface); 10762 if (token != null) { 10763 Canvas canvas = surface.lockCanvas(null); 10764 try { 10765 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 10766 shadowBuilder.onDrawShadow(canvas); 10767 } finally { 10768 surface.unlockCanvasAndPost(canvas); 10769 } 10770 10771 final ViewRoot root = getViewRoot(); 10772 10773 // Cache the local state object for delivery with DragEvents 10774 root.setLocalDragState(myLocalState); 10775 10776 // repurpose 'shadowSize' for the last touch point 10777 root.getLastTouchPoint(shadowSize); 10778 10779 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 10780 shadowSize.x, shadowSize.y, 10781 shadowTouchPoint.x, shadowTouchPoint.y, data); 10782 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 10783 } 10784 } catch (Exception e) { 10785 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 10786 surface.destroy(); 10787 } 10788 10789 return okay; 10790 } 10791 10792 /** 10793 * Drag-and-drop event dispatch. The event.getAction() verb is one of the DragEvent 10794 * constants DRAG_STARTED_EVENT, DRAG_EVENT, DROP_EVENT, and DRAG_ENDED_EVENT. 10795 * 10796 * For DRAG_STARTED_EVENT, event.getClipDescription() describes the content 10797 * being dragged. onDragEvent() should return 'true' if the view can handle 10798 * a drop of that content. A view that returns 'false' here will receive no 10799 * further calls to onDragEvent() about the drag/drop operation. 10800 * 10801 * For DRAG_ENTERED, event.getClipDescription() describes the content being 10802 * dragged. This will be the same content description passed in the 10803 * DRAG_STARTED_EVENT invocation. 10804 * 10805 * For DRAG_EXITED, event.getClipDescription() describes the content being 10806 * dragged. This will be the same content description passed in the 10807 * DRAG_STARTED_EVENT invocation. The view should return to its approriate 10808 * drag-acceptance visual state. 10809 * 10810 * For DRAG_LOCATION_EVENT, event.getX() and event.getY() give the location in View 10811 * coordinates of the current drag point. The view must return 'true' if it 10812 * can accept a drop of the current drag content, false otherwise. 10813 * 10814 * For DROP_EVENT, event.getX() and event.getY() give the location of the drop 10815 * within the view; also, event.getClipData() returns the full data payload 10816 * being dropped. The view should return 'true' if it consumed the dropped 10817 * content, 'false' if it did not. 10818 * 10819 * For DRAG_ENDED_EVENT, the 'event' argument may be null. The view should return 10820 * to its normal visual state. 10821 */ 10822 public boolean onDragEvent(DragEvent event) { 10823 return false; 10824 } 10825 10826 /** 10827 * Views typically don't need to override dispatchDragEvent(); it just calls 10828 * onDragEvent(event) and passes the result up appropriately. 10829 */ 10830 public boolean dispatchDragEvent(DragEvent event) { 10831 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 10832 && mOnDragListener.onDrag(this, event)) { 10833 return true; 10834 } 10835 return onDragEvent(event); 10836 } 10837 10838 /** 10839 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 10840 * it is ever exposed at all. 10841 * @hide 10842 */ 10843 public void onCloseSystemDialogs(String reason) { 10844 } 10845 10846 /** 10847 * Given a Drawable whose bounds have been set to draw into this view, 10848 * update a Region being computed for {@link #gatherTransparentRegion} so 10849 * that any non-transparent parts of the Drawable are removed from the 10850 * given transparent region. 10851 * 10852 * @param dr The Drawable whose transparency is to be applied to the region. 10853 * @param region A Region holding the current transparency information, 10854 * where any parts of the region that are set are considered to be 10855 * transparent. On return, this region will be modified to have the 10856 * transparency information reduced by the corresponding parts of the 10857 * Drawable that are not transparent. 10858 * {@hide} 10859 */ 10860 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 10861 if (DBG) { 10862 Log.i("View", "Getting transparent region for: " + this); 10863 } 10864 final Region r = dr.getTransparentRegion(); 10865 final Rect db = dr.getBounds(); 10866 final AttachInfo attachInfo = mAttachInfo; 10867 if (r != null && attachInfo != null) { 10868 final int w = getRight()-getLeft(); 10869 final int h = getBottom()-getTop(); 10870 if (db.left > 0) { 10871 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 10872 r.op(0, 0, db.left, h, Region.Op.UNION); 10873 } 10874 if (db.right < w) { 10875 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 10876 r.op(db.right, 0, w, h, Region.Op.UNION); 10877 } 10878 if (db.top > 0) { 10879 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 10880 r.op(0, 0, w, db.top, Region.Op.UNION); 10881 } 10882 if (db.bottom < h) { 10883 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 10884 r.op(0, db.bottom, w, h, Region.Op.UNION); 10885 } 10886 final int[] location = attachInfo.mTransparentLocation; 10887 getLocationInWindow(location); 10888 r.translate(location[0], location[1]); 10889 region.op(r, Region.Op.INTERSECT); 10890 } else { 10891 region.op(db, Region.Op.DIFFERENCE); 10892 } 10893 } 10894 10895 private void postCheckForLongClick(int delayOffset) { 10896 mHasPerformedLongPress = false; 10897 10898 if (mPendingCheckForLongPress == null) { 10899 mPendingCheckForLongPress = new CheckForLongPress(); 10900 } 10901 mPendingCheckForLongPress.rememberWindowAttachCount(); 10902 postDelayed(mPendingCheckForLongPress, 10903 ViewConfiguration.getLongPressTimeout() - delayOffset); 10904 } 10905 10906 /** 10907 * Inflate a view from an XML resource. This convenience method wraps the {@link 10908 * LayoutInflater} class, which provides a full range of options for view inflation. 10909 * 10910 * @param context The Context object for your activity or application. 10911 * @param resource The resource ID to inflate 10912 * @param root A view group that will be the parent. Used to properly inflate the 10913 * layout_* parameters. 10914 * @see LayoutInflater 10915 */ 10916 public static View inflate(Context context, int resource, ViewGroup root) { 10917 LayoutInflater factory = LayoutInflater.from(context); 10918 return factory.inflate(resource, root); 10919 } 10920 10921 /** 10922 * Scroll the view with standard behavior for scrolling beyond the normal 10923 * content boundaries. Views that call this method should override 10924 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 10925 * results of an over-scroll operation. 10926 * 10927 * Views can use this method to handle any touch or fling-based scrolling. 10928 * 10929 * @param deltaX Change in X in pixels 10930 * @param deltaY Change in Y in pixels 10931 * @param scrollX Current X scroll value in pixels before applying deltaX 10932 * @param scrollY Current Y scroll value in pixels before applying deltaY 10933 * @param scrollRangeX Maximum content scroll range along the X axis 10934 * @param scrollRangeY Maximum content scroll range along the Y axis 10935 * @param maxOverScrollX Number of pixels to overscroll by in either direction 10936 * along the X axis. 10937 * @param maxOverScrollY Number of pixels to overscroll by in either direction 10938 * along the Y axis. 10939 * @param isTouchEvent true if this scroll operation is the result of a touch event. 10940 * @return true if scrolling was clamped to an over-scroll boundary along either 10941 * axis, false otherwise. 10942 */ 10943 protected boolean overScrollBy(int deltaX, int deltaY, 10944 int scrollX, int scrollY, 10945 int scrollRangeX, int scrollRangeY, 10946 int maxOverScrollX, int maxOverScrollY, 10947 boolean isTouchEvent) { 10948 final int overScrollMode = mOverScrollMode; 10949 final boolean canScrollHorizontal = 10950 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 10951 final boolean canScrollVertical = 10952 computeVerticalScrollRange() > computeVerticalScrollExtent(); 10953 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 10954 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 10955 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 10956 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 10957 10958 int newScrollX = scrollX + deltaX; 10959 if (!overScrollHorizontal) { 10960 maxOverScrollX = 0; 10961 } 10962 10963 int newScrollY = scrollY + deltaY; 10964 if (!overScrollVertical) { 10965 maxOverScrollY = 0; 10966 } 10967 10968 // Clamp values if at the limits and record 10969 final int left = -maxOverScrollX; 10970 final int right = maxOverScrollX + scrollRangeX; 10971 final int top = -maxOverScrollY; 10972 final int bottom = maxOverScrollY + scrollRangeY; 10973 10974 boolean clampedX = false; 10975 if (newScrollX > right) { 10976 newScrollX = right; 10977 clampedX = true; 10978 } else if (newScrollX < left) { 10979 newScrollX = left; 10980 clampedX = true; 10981 } 10982 10983 boolean clampedY = false; 10984 if (newScrollY > bottom) { 10985 newScrollY = bottom; 10986 clampedY = true; 10987 } else if (newScrollY < top) { 10988 newScrollY = top; 10989 clampedY = true; 10990 } 10991 10992 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 10993 10994 return clampedX || clampedY; 10995 } 10996 10997 /** 10998 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 10999 * respond to the results of an over-scroll operation. 11000 * 11001 * @param scrollX New X scroll value in pixels 11002 * @param scrollY New Y scroll value in pixels 11003 * @param clampedX True if scrollX was clamped to an over-scroll boundary 11004 * @param clampedY True if scrollY was clamped to an over-scroll boundary 11005 */ 11006 protected void onOverScrolled(int scrollX, int scrollY, 11007 boolean clampedX, boolean clampedY) { 11008 // Intentionally empty. 11009 } 11010 11011 /** 11012 * Returns the over-scroll mode for this view. The result will be 11013 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11014 * (allow over-scrolling only if the view content is larger than the container), 11015 * or {@link #OVER_SCROLL_NEVER}. 11016 * 11017 * @return This view's over-scroll mode. 11018 */ 11019 public int getOverScrollMode() { 11020 return mOverScrollMode; 11021 } 11022 11023 /** 11024 * Set the over-scroll mode for this view. Valid over-scroll modes are 11025 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11026 * (allow over-scrolling only if the view content is larger than the container), 11027 * or {@link #OVER_SCROLL_NEVER}. 11028 * 11029 * Setting the over-scroll mode of a view will have an effect only if the 11030 * view is capable of scrolling. 11031 * 11032 * @param overScrollMode The new over-scroll mode for this view. 11033 */ 11034 public void setOverScrollMode(int overScrollMode) { 11035 if (overScrollMode != OVER_SCROLL_ALWAYS && 11036 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 11037 overScrollMode != OVER_SCROLL_NEVER) { 11038 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 11039 } 11040 mOverScrollMode = overScrollMode; 11041 } 11042 11043 /** 11044 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 11045 * Each MeasureSpec represents a requirement for either the width or the height. 11046 * A MeasureSpec is comprised of a size and a mode. There are three possible 11047 * modes: 11048 * <dl> 11049 * <dt>UNSPECIFIED</dt> 11050 * <dd> 11051 * The parent has not imposed any constraint on the child. It can be whatever size 11052 * it wants. 11053 * </dd> 11054 * 11055 * <dt>EXACTLY</dt> 11056 * <dd> 11057 * The parent has determined an exact size for the child. The child is going to be 11058 * given those bounds regardless of how big it wants to be. 11059 * </dd> 11060 * 11061 * <dt>AT_MOST</dt> 11062 * <dd> 11063 * The child can be as large as it wants up to the specified size. 11064 * </dd> 11065 * </dl> 11066 * 11067 * MeasureSpecs are implemented as ints to reduce object allocation. This class 11068 * is provided to pack and unpack the <size, mode> tuple into the int. 11069 */ 11070 public static class MeasureSpec { 11071 private static final int MODE_SHIFT = 30; 11072 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 11073 11074 /** 11075 * Measure specification mode: The parent has not imposed any constraint 11076 * on the child. It can be whatever size it wants. 11077 */ 11078 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 11079 11080 /** 11081 * Measure specification mode: The parent has determined an exact size 11082 * for the child. The child is going to be given those bounds regardless 11083 * of how big it wants to be. 11084 */ 11085 public static final int EXACTLY = 1 << MODE_SHIFT; 11086 11087 /** 11088 * Measure specification mode: The child can be as large as it wants up 11089 * to the specified size. 11090 */ 11091 public static final int AT_MOST = 2 << MODE_SHIFT; 11092 11093 /** 11094 * Creates a measure specification based on the supplied size and mode. 11095 * 11096 * The mode must always be one of the following: 11097 * <ul> 11098 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 11099 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 11100 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 11101 * </ul> 11102 * 11103 * @param size the size of the measure specification 11104 * @param mode the mode of the measure specification 11105 * @return the measure specification based on size and mode 11106 */ 11107 public static int makeMeasureSpec(int size, int mode) { 11108 return size + mode; 11109 } 11110 11111 /** 11112 * Extracts the mode from the supplied measure specification. 11113 * 11114 * @param measureSpec the measure specification to extract the mode from 11115 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 11116 * {@link android.view.View.MeasureSpec#AT_MOST} or 11117 * {@link android.view.View.MeasureSpec#EXACTLY} 11118 */ 11119 public static int getMode(int measureSpec) { 11120 return (measureSpec & MODE_MASK); 11121 } 11122 11123 /** 11124 * Extracts the size from the supplied measure specification. 11125 * 11126 * @param measureSpec the measure specification to extract the size from 11127 * @return the size in pixels defined in the supplied measure specification 11128 */ 11129 public static int getSize(int measureSpec) { 11130 return (measureSpec & ~MODE_MASK); 11131 } 11132 11133 /** 11134 * Returns a String representation of the specified measure 11135 * specification. 11136 * 11137 * @param measureSpec the measure specification to convert to a String 11138 * @return a String with the following format: "MeasureSpec: MODE SIZE" 11139 */ 11140 public static String toString(int measureSpec) { 11141 int mode = getMode(measureSpec); 11142 int size = getSize(measureSpec); 11143 11144 StringBuilder sb = new StringBuilder("MeasureSpec: "); 11145 11146 if (mode == UNSPECIFIED) 11147 sb.append("UNSPECIFIED "); 11148 else if (mode == EXACTLY) 11149 sb.append("EXACTLY "); 11150 else if (mode == AT_MOST) 11151 sb.append("AT_MOST "); 11152 else 11153 sb.append(mode).append(" "); 11154 11155 sb.append(size); 11156 return sb.toString(); 11157 } 11158 } 11159 11160 class CheckForLongPress implements Runnable { 11161 11162 private int mOriginalWindowAttachCount; 11163 11164 public void run() { 11165 if (isPressed() && (mParent != null) 11166 && mOriginalWindowAttachCount == mWindowAttachCount) { 11167 if (performLongClick()) { 11168 mHasPerformedLongPress = true; 11169 } 11170 } 11171 } 11172 11173 public void rememberWindowAttachCount() { 11174 mOriginalWindowAttachCount = mWindowAttachCount; 11175 } 11176 } 11177 11178 private final class CheckForTap implements Runnable { 11179 public void run() { 11180 mPrivateFlags &= ~PREPRESSED; 11181 mPrivateFlags |= PRESSED; 11182 refreshDrawableState(); 11183 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 11184 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 11185 } 11186 } 11187 } 11188 11189 private final class PerformClick implements Runnable { 11190 public void run() { 11191 performClick(); 11192 } 11193 } 11194 11195 /** 11196 * Interface definition for a callback to be invoked when a key event is 11197 * dispatched to this view. The callback will be invoked before the key 11198 * event is given to the view. 11199 */ 11200 public interface OnKeyListener { 11201 /** 11202 * Called when a key is dispatched to a view. This allows listeners to 11203 * get a chance to respond before the target view. 11204 * 11205 * @param v The view the key has been dispatched to. 11206 * @param keyCode The code for the physical key that was pressed 11207 * @param event The KeyEvent object containing full information about 11208 * the event. 11209 * @return True if the listener has consumed the event, false otherwise. 11210 */ 11211 boolean onKey(View v, int keyCode, KeyEvent event); 11212 } 11213 11214 /** 11215 * Interface definition for a callback to be invoked when a touch event is 11216 * dispatched to this view. The callback will be invoked before the touch 11217 * event is given to the view. 11218 */ 11219 public interface OnTouchListener { 11220 /** 11221 * Called when a touch event is dispatched to a view. This allows listeners to 11222 * get a chance to respond before the target view. 11223 * 11224 * @param v The view the touch event has been dispatched to. 11225 * @param event The MotionEvent object containing full information about 11226 * the event. 11227 * @return True if the listener has consumed the event, false otherwise. 11228 */ 11229 boolean onTouch(View v, MotionEvent event); 11230 } 11231 11232 /** 11233 * Interface definition for a callback to be invoked when a view has been clicked and held. 11234 */ 11235 public interface OnLongClickListener { 11236 /** 11237 * Called when a view has been clicked and held. 11238 * 11239 * @param v The view that was clicked and held. 11240 * 11241 * @return true if the callback consumed the long click, false otherwise. 11242 */ 11243 boolean onLongClick(View v); 11244 } 11245 11246 /** 11247 * Interface definition for a callback to be invoked when a drag is being dispatched 11248 * to this view. The callback will be invoked before the hosting view's own 11249 * onDrag(event) method. If the listener wants to fall back to the hosting view's 11250 * onDrag(event) behavior, it should return 'false' from this callback. 11251 */ 11252 public interface OnDragListener { 11253 /** 11254 * Called when a drag event is dispatched to a view. This allows listeners 11255 * to get a chance to override base View behavior. 11256 * 11257 * @param v The view the drag has been dispatched to. 11258 * @param event The DragEvent object containing full information 11259 * about the event. 11260 * @return true if the listener consumed the DragEvent, false in order to fall 11261 * back to the view's default handling. 11262 */ 11263 boolean onDrag(View v, DragEvent event); 11264 } 11265 11266 /** 11267 * Interface definition for a callback to be invoked when the focus state of 11268 * a view changed. 11269 */ 11270 public interface OnFocusChangeListener { 11271 /** 11272 * Called when the focus state of a view has changed. 11273 * 11274 * @param v The view whose state has changed. 11275 * @param hasFocus The new focus state of v. 11276 */ 11277 void onFocusChange(View v, boolean hasFocus); 11278 } 11279 11280 /** 11281 * Interface definition for a callback to be invoked when a view is clicked. 11282 */ 11283 public interface OnClickListener { 11284 /** 11285 * Called when a view has been clicked. 11286 * 11287 * @param v The view that was clicked. 11288 */ 11289 void onClick(View v); 11290 } 11291 11292 /** 11293 * Interface definition for a callback to be invoked when the context menu 11294 * for this view is being built. 11295 */ 11296 public interface OnCreateContextMenuListener { 11297 /** 11298 * Called when the context menu for this view is being built. It is not 11299 * safe to hold onto the menu after this method returns. 11300 * 11301 * @param menu The context menu that is being built 11302 * @param v The view for which the context menu is being built 11303 * @param menuInfo Extra information about the item for which the 11304 * context menu should be shown. This information will vary 11305 * depending on the class of v. 11306 */ 11307 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 11308 } 11309 11310 private final class UnsetPressedState implements Runnable { 11311 public void run() { 11312 setPressed(false); 11313 } 11314 } 11315 11316 /** 11317 * Base class for derived classes that want to save and restore their own 11318 * state in {@link android.view.View#onSaveInstanceState()}. 11319 */ 11320 public static class BaseSavedState extends AbsSavedState { 11321 /** 11322 * Constructor used when reading from a parcel. Reads the state of the superclass. 11323 * 11324 * @param source 11325 */ 11326 public BaseSavedState(Parcel source) { 11327 super(source); 11328 } 11329 11330 /** 11331 * Constructor called by derived classes when creating their SavedState objects 11332 * 11333 * @param superState The state of the superclass of this view 11334 */ 11335 public BaseSavedState(Parcelable superState) { 11336 super(superState); 11337 } 11338 11339 public static final Parcelable.Creator<BaseSavedState> CREATOR = 11340 new Parcelable.Creator<BaseSavedState>() { 11341 public BaseSavedState createFromParcel(Parcel in) { 11342 return new BaseSavedState(in); 11343 } 11344 11345 public BaseSavedState[] newArray(int size) { 11346 return new BaseSavedState[size]; 11347 } 11348 }; 11349 } 11350 11351 /** 11352 * A set of information given to a view when it is attached to its parent 11353 * window. 11354 */ 11355 static class AttachInfo { 11356 interface Callbacks { 11357 void playSoundEffect(int effectId); 11358 boolean performHapticFeedback(int effectId, boolean always); 11359 } 11360 11361 /** 11362 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 11363 * to a Handler. This class contains the target (View) to invalidate and 11364 * the coordinates of the dirty rectangle. 11365 * 11366 * For performance purposes, this class also implements a pool of up to 11367 * POOL_LIMIT objects that get reused. This reduces memory allocations 11368 * whenever possible. 11369 */ 11370 static class InvalidateInfo implements Poolable<InvalidateInfo> { 11371 private static final int POOL_LIMIT = 10; 11372 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 11373 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 11374 public InvalidateInfo newInstance() { 11375 return new InvalidateInfo(); 11376 } 11377 11378 public void onAcquired(InvalidateInfo element) { 11379 } 11380 11381 public void onReleased(InvalidateInfo element) { 11382 } 11383 }, POOL_LIMIT) 11384 ); 11385 11386 private InvalidateInfo mNext; 11387 11388 View target; 11389 11390 int left; 11391 int top; 11392 int right; 11393 int bottom; 11394 11395 public void setNextPoolable(InvalidateInfo element) { 11396 mNext = element; 11397 } 11398 11399 public InvalidateInfo getNextPoolable() { 11400 return mNext; 11401 } 11402 11403 static InvalidateInfo acquire() { 11404 return sPool.acquire(); 11405 } 11406 11407 void release() { 11408 sPool.release(this); 11409 } 11410 } 11411 11412 final IWindowSession mSession; 11413 11414 final IWindow mWindow; 11415 11416 final IBinder mWindowToken; 11417 11418 final Callbacks mRootCallbacks; 11419 11420 /** 11421 * The top view of the hierarchy. 11422 */ 11423 View mRootView; 11424 11425 IBinder mPanelParentWindowToken; 11426 Surface mSurface; 11427 11428 boolean mHardwareAccelerated; 11429 boolean mHardwareAccelerationRequested; 11430 HardwareRenderer mHardwareRenderer; 11431 11432 /** 11433 * Scale factor used by the compatibility mode 11434 */ 11435 float mApplicationScale; 11436 11437 /** 11438 * Indicates whether the application is in compatibility mode 11439 */ 11440 boolean mScalingRequired; 11441 11442 /** 11443 * Left position of this view's window 11444 */ 11445 int mWindowLeft; 11446 11447 /** 11448 * Top position of this view's window 11449 */ 11450 int mWindowTop; 11451 11452 /** 11453 * Indicates whether views need to use 32-bit drawing caches 11454 */ 11455 boolean mUse32BitDrawingCache; 11456 11457 /** 11458 * For windows that are full-screen but using insets to layout inside 11459 * of the screen decorations, these are the current insets for the 11460 * content of the window. 11461 */ 11462 final Rect mContentInsets = new Rect(); 11463 11464 /** 11465 * For windows that are full-screen but using insets to layout inside 11466 * of the screen decorations, these are the current insets for the 11467 * actual visible parts of the window. 11468 */ 11469 final Rect mVisibleInsets = new Rect(); 11470 11471 /** 11472 * The internal insets given by this window. This value is 11473 * supplied by the client (through 11474 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 11475 * be given to the window manager when changed to be used in laying 11476 * out windows behind it. 11477 */ 11478 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 11479 = new ViewTreeObserver.InternalInsetsInfo(); 11480 11481 /** 11482 * All views in the window's hierarchy that serve as scroll containers, 11483 * used to determine if the window can be resized or must be panned 11484 * to adjust for a soft input area. 11485 */ 11486 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 11487 11488 final KeyEvent.DispatcherState mKeyDispatchState 11489 = new KeyEvent.DispatcherState(); 11490 11491 /** 11492 * Indicates whether the view's window currently has the focus. 11493 */ 11494 boolean mHasWindowFocus; 11495 11496 /** 11497 * The current visibility of the window. 11498 */ 11499 int mWindowVisibility; 11500 11501 /** 11502 * Indicates the time at which drawing started to occur. 11503 */ 11504 long mDrawingTime; 11505 11506 /** 11507 * Indicates whether or not ignoring the DIRTY_MASK flags. 11508 */ 11509 boolean mIgnoreDirtyState; 11510 11511 /** 11512 * Indicates whether the view's window is currently in touch mode. 11513 */ 11514 boolean mInTouchMode; 11515 11516 /** 11517 * Indicates that ViewRoot should trigger a global layout change 11518 * the next time it performs a traversal 11519 */ 11520 boolean mRecomputeGlobalAttributes; 11521 11522 /** 11523 * Set during a traveral if any views want to keep the screen on. 11524 */ 11525 boolean mKeepScreenOn; 11526 11527 /** 11528 * Set if the visibility of any views has changed. 11529 */ 11530 boolean mViewVisibilityChanged; 11531 11532 /** 11533 * Set to true if a view has been scrolled. 11534 */ 11535 boolean mViewScrollChanged; 11536 11537 /** 11538 * Global to the view hierarchy used as a temporary for dealing with 11539 * x/y points in the transparent region computations. 11540 */ 11541 final int[] mTransparentLocation = new int[2]; 11542 11543 /** 11544 * Global to the view hierarchy used as a temporary for dealing with 11545 * x/y points in the ViewGroup.invalidateChild implementation. 11546 */ 11547 final int[] mInvalidateChildLocation = new int[2]; 11548 11549 11550 /** 11551 * Global to the view hierarchy used as a temporary for dealing with 11552 * x/y location when view is transformed. 11553 */ 11554 final float[] mTmpTransformLocation = new float[2]; 11555 11556 /** 11557 * The view tree observer used to dispatch global events like 11558 * layout, pre-draw, touch mode change, etc. 11559 */ 11560 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 11561 11562 /** 11563 * A Canvas used by the view hierarchy to perform bitmap caching. 11564 */ 11565 Canvas mCanvas; 11566 11567 /** 11568 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 11569 * handler can be used to pump events in the UI events queue. 11570 */ 11571 final Handler mHandler; 11572 11573 /** 11574 * Identifier for messages requesting the view to be invalidated. 11575 * Such messages should be sent to {@link #mHandler}. 11576 */ 11577 static final int INVALIDATE_MSG = 0x1; 11578 11579 /** 11580 * Identifier for messages requesting the view to invalidate a region. 11581 * Such messages should be sent to {@link #mHandler}. 11582 */ 11583 static final int INVALIDATE_RECT_MSG = 0x2; 11584 11585 /** 11586 * Temporary for use in computing invalidate rectangles while 11587 * calling up the hierarchy. 11588 */ 11589 final Rect mTmpInvalRect = new Rect(); 11590 11591 /** 11592 * Temporary for use in computing hit areas with transformed views 11593 */ 11594 final RectF mTmpTransformRect = new RectF(); 11595 11596 /** 11597 * Temporary list for use in collecting focusable descendents of a view. 11598 */ 11599 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 11600 11601 /** 11602 * Creates a new set of attachment information with the specified 11603 * events handler and thread. 11604 * 11605 * @param handler the events handler the view must use 11606 */ 11607 AttachInfo(IWindowSession session, IWindow window, 11608 Handler handler, Callbacks effectPlayer) { 11609 mSession = session; 11610 mWindow = window; 11611 mWindowToken = window.asBinder(); 11612 mHandler = handler; 11613 mRootCallbacks = effectPlayer; 11614 } 11615 } 11616 11617 /** 11618 * <p>ScrollabilityCache holds various fields used by a View when scrolling 11619 * is supported. This avoids keeping too many unused fields in most 11620 * instances of View.</p> 11621 */ 11622 private static class ScrollabilityCache implements Runnable { 11623 11624 /** 11625 * Scrollbars are not visible 11626 */ 11627 public static final int OFF = 0; 11628 11629 /** 11630 * Scrollbars are visible 11631 */ 11632 public static final int ON = 1; 11633 11634 /** 11635 * Scrollbars are fading away 11636 */ 11637 public static final int FADING = 2; 11638 11639 public boolean fadeScrollBars; 11640 11641 public int fadingEdgeLength; 11642 public int scrollBarDefaultDelayBeforeFade; 11643 public int scrollBarFadeDuration; 11644 11645 public int scrollBarSize; 11646 public ScrollBarDrawable scrollBar; 11647 public float[] interpolatorValues; 11648 public View host; 11649 11650 public final Paint paint; 11651 public final Matrix matrix; 11652 public Shader shader; 11653 11654 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 11655 11656 private static final float[] OPAQUE = { 255 }; 11657 private static final float[] TRANSPARENT = { 0.0f }; 11658 11659 /** 11660 * When fading should start. This time moves into the future every time 11661 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 11662 */ 11663 public long fadeStartTime; 11664 11665 11666 /** 11667 * The current state of the scrollbars: ON, OFF, or FADING 11668 */ 11669 public int state = OFF; 11670 11671 private int mLastColor; 11672 11673 public ScrollabilityCache(ViewConfiguration configuration, View host) { 11674 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 11675 scrollBarSize = configuration.getScaledScrollBarSize(); 11676 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 11677 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 11678 11679 paint = new Paint(); 11680 matrix = new Matrix(); 11681 // use use a height of 1, and then wack the matrix each time we 11682 // actually use it. 11683 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 11684 11685 paint.setShader(shader); 11686 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 11687 this.host = host; 11688 } 11689 11690 public void setFadeColor(int color) { 11691 if (color != 0 && color != mLastColor) { 11692 mLastColor = color; 11693 color |= 0xFF000000; 11694 11695 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 11696 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 11697 11698 paint.setShader(shader); 11699 // Restore the default transfer mode (src_over) 11700 paint.setXfermode(null); 11701 } 11702 } 11703 11704 public void run() { 11705 long now = AnimationUtils.currentAnimationTimeMillis(); 11706 if (now >= fadeStartTime) { 11707 11708 // the animation fades the scrollbars out by changing 11709 // the opacity (alpha) from fully opaque to fully 11710 // transparent 11711 int nextFrame = (int) now; 11712 int framesCount = 0; 11713 11714 Interpolator interpolator = scrollBarInterpolator; 11715 11716 // Start opaque 11717 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 11718 11719 // End transparent 11720 nextFrame += scrollBarFadeDuration; 11721 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 11722 11723 state = FADING; 11724 11725 // Kick off the fade animation 11726 host.invalidate(); 11727 } 11728 } 11729 11730 } 11731} 11732