View.java revision 3cb8b638c49b767354b62d853067ae8290ff7e80
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 /** 1817 * Convenience value to check for float values that are close enough to zero to be considered 1818 * zero. 1819 */ 1820 private static final float NONZERO_EPSILON = .001f; 1821 1822 /** 1823 * The degrees rotation around the vertical axis through the pivot point. 1824 */ 1825 @ViewDebug.ExportedProperty 1826 private float mRotationY = 0f; 1827 1828 /** 1829 * The degrees rotation around the horizontal axis through the pivot point. 1830 */ 1831 @ViewDebug.ExportedProperty 1832 private float mRotationX = 0f; 1833 1834 /** 1835 * The degrees rotation around the pivot point. 1836 */ 1837 @ViewDebug.ExportedProperty 1838 private float mRotation = 0f; 1839 1840 /** 1841 * The amount of translation of the object away from its left property (post-layout). 1842 */ 1843 @ViewDebug.ExportedProperty 1844 private float mTranslationX = 0f; 1845 1846 /** 1847 * The amount of translation of the object away from its top property (post-layout). 1848 */ 1849 @ViewDebug.ExportedProperty 1850 private float mTranslationY = 0f; 1851 1852 /** 1853 * The amount of scale in the x direction around the pivot point. A 1854 * value of 1 means no scaling is applied. 1855 */ 1856 @ViewDebug.ExportedProperty 1857 private float mScaleX = 1f; 1858 1859 /** 1860 * The amount of scale in the y direction around the pivot point. A 1861 * value of 1 means no scaling is applied. 1862 */ 1863 @ViewDebug.ExportedProperty 1864 private float mScaleY = 1f; 1865 1866 /** 1867 * The amount of scale in the x direction around the pivot point. A 1868 * value of 1 means no scaling is applied. 1869 */ 1870 @ViewDebug.ExportedProperty 1871 private float mPivotX = 0f; 1872 1873 /** 1874 * The amount of scale in the y direction around the pivot point. A 1875 * value of 1 means no scaling is applied. 1876 */ 1877 @ViewDebug.ExportedProperty 1878 private float mPivotY = 0f; 1879 1880 /** 1881 * The opacity of the View. This is a value from 0 to 1, where 0 means 1882 * completely transparent and 1 means completely opaque. 1883 */ 1884 @ViewDebug.ExportedProperty 1885 private float mAlpha = 1f; 1886 1887 /** 1888 * The distance in pixels from the left edge of this view's parent 1889 * to the left edge of this view. 1890 * {@hide} 1891 */ 1892 @ViewDebug.ExportedProperty(category = "layout") 1893 protected int mLeft; 1894 /** 1895 * The distance in pixels from the left edge of this view's parent 1896 * to the right edge of this view. 1897 * {@hide} 1898 */ 1899 @ViewDebug.ExportedProperty(category = "layout") 1900 protected int mRight; 1901 /** 1902 * The distance in pixels from the top edge of this view's parent 1903 * to the top edge of this view. 1904 * {@hide} 1905 */ 1906 @ViewDebug.ExportedProperty(category = "layout") 1907 protected int mTop; 1908 /** 1909 * The distance in pixels from the top edge of this view's parent 1910 * to the bottom edge of this view. 1911 * {@hide} 1912 */ 1913 @ViewDebug.ExportedProperty(category = "layout") 1914 protected int mBottom; 1915 1916 /** 1917 * The offset, in pixels, by which the content of this view is scrolled 1918 * horizontally. 1919 * {@hide} 1920 */ 1921 @ViewDebug.ExportedProperty(category = "scrolling") 1922 protected int mScrollX; 1923 /** 1924 * The offset, in pixels, by which the content of this view is scrolled 1925 * vertically. 1926 * {@hide} 1927 */ 1928 @ViewDebug.ExportedProperty(category = "scrolling") 1929 protected int mScrollY; 1930 1931 /** 1932 * The left padding in pixels, that is the distance in pixels between the 1933 * left edge of this view and the left edge of its content. 1934 * {@hide} 1935 */ 1936 @ViewDebug.ExportedProperty(category = "padding") 1937 protected int mPaddingLeft; 1938 /** 1939 * The right padding in pixels, that is the distance in pixels between the 1940 * right edge of this view and the right edge of its content. 1941 * {@hide} 1942 */ 1943 @ViewDebug.ExportedProperty(category = "padding") 1944 protected int mPaddingRight; 1945 /** 1946 * The top padding in pixels, that is the distance in pixels between the 1947 * top edge of this view and the top edge of its content. 1948 * {@hide} 1949 */ 1950 @ViewDebug.ExportedProperty(category = "padding") 1951 protected int mPaddingTop; 1952 /** 1953 * The bottom padding in pixels, that is the distance in pixels between the 1954 * bottom edge of this view and the bottom edge of its content. 1955 * {@hide} 1956 */ 1957 @ViewDebug.ExportedProperty(category = "padding") 1958 protected int mPaddingBottom; 1959 1960 /** 1961 * Briefly describes the view and is primarily used for accessibility support. 1962 */ 1963 private CharSequence mContentDescription; 1964 1965 /** 1966 * Cache the paddingRight set by the user to append to the scrollbar's size. 1967 */ 1968 @ViewDebug.ExportedProperty(category = "padding") 1969 int mUserPaddingRight; 1970 1971 /** 1972 * Cache the paddingBottom set by the user to append to the scrollbar's size. 1973 */ 1974 @ViewDebug.ExportedProperty(category = "padding") 1975 int mUserPaddingBottom; 1976 1977 /** 1978 * Cache the paddingLeft set by the user to append to the scrollbar's size. 1979 */ 1980 @ViewDebug.ExportedProperty(category = "padding") 1981 int mUserPaddingLeft; 1982 1983 /** 1984 * @hide 1985 */ 1986 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 1987 /** 1988 * @hide 1989 */ 1990 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 1991 1992 private Resources mResources = null; 1993 1994 private Drawable mBGDrawable; 1995 1996 private int mBackgroundResource; 1997 private boolean mBackgroundSizeChanged; 1998 1999 /** 2000 * Listener used to dispatch focus change events. 2001 * This field should be made private, so it is hidden from the SDK. 2002 * {@hide} 2003 */ 2004 protected OnFocusChangeListener mOnFocusChangeListener; 2005 2006 /** 2007 * Listeners for layout change events. 2008 */ 2009 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2010 2011 /** 2012 * Listener used to dispatch click events. 2013 * This field should be made private, so it is hidden from the SDK. 2014 * {@hide} 2015 */ 2016 protected OnClickListener mOnClickListener; 2017 2018 /** 2019 * Listener used to dispatch long click events. 2020 * This field should be made private, so it is hidden from the SDK. 2021 * {@hide} 2022 */ 2023 protected OnLongClickListener mOnLongClickListener; 2024 2025 /** 2026 * Listener used to build the context menu. 2027 * This field should be made private, so it is hidden from the SDK. 2028 * {@hide} 2029 */ 2030 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2031 2032 private OnKeyListener mOnKeyListener; 2033 2034 private OnTouchListener mOnTouchListener; 2035 2036 private OnDragListener mOnDragListener; 2037 2038 /** 2039 * The application environment this view lives in. 2040 * This field should be made private, so it is hidden from the SDK. 2041 * {@hide} 2042 */ 2043 protected Context mContext; 2044 2045 private ScrollabilityCache mScrollCache; 2046 2047 private int[] mDrawableState = null; 2048 2049 private Bitmap mDrawingCache; 2050 private Bitmap mUnscaledDrawingCache; 2051 private DisplayList mDisplayList; 2052 private HardwareLayer mHardwareLayer; 2053 2054 /** 2055 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2056 * the user may specify which view to go to next. 2057 */ 2058 private int mNextFocusLeftId = View.NO_ID; 2059 2060 /** 2061 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2062 * the user may specify which view to go to next. 2063 */ 2064 private int mNextFocusRightId = View.NO_ID; 2065 2066 /** 2067 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2068 * the user may specify which view to go to next. 2069 */ 2070 private int mNextFocusUpId = View.NO_ID; 2071 2072 /** 2073 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2074 * the user may specify which view to go to next. 2075 */ 2076 private int mNextFocusDownId = View.NO_ID; 2077 2078 /** 2079 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2080 * the user may specify which view to go to next. 2081 */ 2082 int mNextFocusForwardId = View.NO_ID; 2083 2084 private CheckForLongPress mPendingCheckForLongPress; 2085 private CheckForTap mPendingCheckForTap = null; 2086 private PerformClick mPerformClick; 2087 2088 private UnsetPressedState mUnsetPressedState; 2089 2090 /** 2091 * Whether the long press's action has been invoked. The tap's action is invoked on the 2092 * up event while a long press is invoked as soon as the long press duration is reached, so 2093 * a long press could be performed before the tap is checked, in which case the tap's action 2094 * should not be invoked. 2095 */ 2096 private boolean mHasPerformedLongPress; 2097 2098 /** 2099 * The minimum height of the view. We'll try our best to have the height 2100 * of this view to at least this amount. 2101 */ 2102 @ViewDebug.ExportedProperty(category = "measurement") 2103 private int mMinHeight; 2104 2105 /** 2106 * The minimum width of the view. We'll try our best to have the width 2107 * of this view to at least this amount. 2108 */ 2109 @ViewDebug.ExportedProperty(category = "measurement") 2110 private int mMinWidth; 2111 2112 /** 2113 * The delegate to handle touch events that are physically in this view 2114 * but should be handled by another view. 2115 */ 2116 private TouchDelegate mTouchDelegate = null; 2117 2118 /** 2119 * Solid color to use as a background when creating the drawing cache. Enables 2120 * the cache to use 16 bit bitmaps instead of 32 bit. 2121 */ 2122 private int mDrawingCacheBackgroundColor = 0; 2123 2124 /** 2125 * Special tree observer used when mAttachInfo is null. 2126 */ 2127 private ViewTreeObserver mFloatingTreeObserver; 2128 2129 /** 2130 * Cache the touch slop from the context that created the view. 2131 */ 2132 private int mTouchSlop; 2133 2134 /** 2135 * Cache drag/drop state 2136 * 2137 */ 2138 boolean mCanAcceptDrop; 2139 2140 /** 2141 * Flag indicating that a drag can cross window boundaries 2142 * @hide 2143 */ 2144 public static final int DRAG_FLAG_GLOBAL = 1; 2145 2146 /** 2147 * Position of the vertical scroll bar. 2148 */ 2149 private int mVerticalScrollbarPosition; 2150 2151 /** 2152 * Position the scroll bar at the default position as determined by the system. 2153 */ 2154 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2155 2156 /** 2157 * Position the scroll bar along the left edge. 2158 */ 2159 public static final int SCROLLBAR_POSITION_LEFT = 1; 2160 2161 /** 2162 * Position the scroll bar along the right edge. 2163 */ 2164 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2165 2166 /** 2167 * Indicates that the view does not have a layer. 2168 * 2169 * @see #getLayerType() 2170 * @see #setLayerType(int, android.graphics.Paint) 2171 * @see #LAYER_TYPE_SOFTWARE 2172 * @see #LAYER_TYPE_HARDWARE 2173 */ 2174 public static final int LAYER_TYPE_NONE = 0; 2175 2176 /** 2177 * <p>Indicates that the view has a software layer. A software layer is backed 2178 * by a bitmap and causes the view to be rendered using Android's software 2179 * rendering pipeline, even if hardware acceleration is enabled.</p> 2180 * 2181 * <p>Software layers have various usages:</p> 2182 * <p>When the application is not using hardware acceleration, a software layer 2183 * is useful to apply a specific color filter and/or blending mode and/or 2184 * translucency to a view and all its children.</p> 2185 * <p>When the application is using hardware acceleration, a software layer 2186 * is useful to render drawing primitives not supported by the hardware 2187 * accelerated pipeline. It can also be used to cache a complex view tree 2188 * into a texture and reduce the complexity of drawing operations. For instance, 2189 * when animating a complex view tree with a translation, a software layer can 2190 * be used to render the view tree only once.</p> 2191 * <p>Software layers should be avoided when the affected view tree updates 2192 * often. Every update will require to re-render the software layer, which can 2193 * potentially be slow (particularly when hardware acceleration is turned on 2194 * since the layer will have to be uploaded into a hardware texture after every 2195 * update.)</p> 2196 * 2197 * @see #getLayerType() 2198 * @see #setLayerType(int, android.graphics.Paint) 2199 * @see #LAYER_TYPE_NONE 2200 * @see #LAYER_TYPE_HARDWARE 2201 */ 2202 public static final int LAYER_TYPE_SOFTWARE = 1; 2203 2204 /** 2205 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2206 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2207 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2208 * rendering pipeline, but only if hardware acceleration is turned on for the 2209 * view hierarchy. When hardware acceleration is turned off, hardware layers 2210 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2211 * 2212 * <p>A hardware layer is useful to apply a specific color filter and/or 2213 * blending mode and/or translucency to a view and all its children.</p> 2214 * <p>A hardware layer can be used to cache a complex view tree into a 2215 * texture and reduce the complexity of drawing operations. For instance, 2216 * when animating a complex view tree with a translation, a hardware layer can 2217 * be used to render the view tree only once.</p> 2218 * <p>A hardware layer can also be used to increase the rendering quality when 2219 * rotation transformations are applied on a view. It can also be used to 2220 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2221 * 2222 * @see #getLayerType() 2223 * @see #setLayerType(int, android.graphics.Paint) 2224 * @see #LAYER_TYPE_NONE 2225 * @see #LAYER_TYPE_SOFTWARE 2226 */ 2227 public static final int LAYER_TYPE_HARDWARE = 2; 2228 2229 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2230 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2231 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2232 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2233 }) 2234 int mLayerType = LAYER_TYPE_NONE; 2235 Paint mLayerPaint; 2236 2237 /** 2238 * Simple constructor to use when creating a view from code. 2239 * 2240 * @param context The Context the view is running in, through which it can 2241 * access the current theme, resources, etc. 2242 */ 2243 public View(Context context) { 2244 mContext = context; 2245 mResources = context != null ? context.getResources() : null; 2246 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2247 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2248 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2249 } 2250 2251 /** 2252 * Constructor that is called when inflating a view from XML. This is called 2253 * when a view is being constructed from an XML file, supplying attributes 2254 * that were specified in the XML file. This version uses a default style of 2255 * 0, so the only attribute values applied are those in the Context's Theme 2256 * and the given AttributeSet. 2257 * 2258 * <p> 2259 * The method onFinishInflate() will be called after all children have been 2260 * added. 2261 * 2262 * @param context The Context the view is running in, through which it can 2263 * access the current theme, resources, etc. 2264 * @param attrs The attributes of the XML tag that is inflating the view. 2265 * @see #View(Context, AttributeSet, int) 2266 */ 2267 public View(Context context, AttributeSet attrs) { 2268 this(context, attrs, 0); 2269 } 2270 2271 /** 2272 * Perform inflation from XML and apply a class-specific base style. This 2273 * constructor of View allows subclasses to use their own base style when 2274 * they are inflating. For example, a Button class's constructor would call 2275 * this version of the super class constructor and supply 2276 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2277 * the theme's button style to modify all of the base view attributes (in 2278 * particular its background) as well as the Button class's attributes. 2279 * 2280 * @param context The Context the view is running in, through which it can 2281 * access the current theme, resources, etc. 2282 * @param attrs The attributes of the XML tag that is inflating the view. 2283 * @param defStyle The default style to apply to this view. If 0, no style 2284 * will be applied (beyond what is included in the theme). This may 2285 * either be an attribute resource, whose value will be retrieved 2286 * from the current theme, or an explicit style resource. 2287 * @see #View(Context, AttributeSet) 2288 */ 2289 public View(Context context, AttributeSet attrs, int defStyle) { 2290 this(context); 2291 2292 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2293 defStyle, 0); 2294 2295 Drawable background = null; 2296 2297 int leftPadding = -1; 2298 int topPadding = -1; 2299 int rightPadding = -1; 2300 int bottomPadding = -1; 2301 2302 int padding = -1; 2303 2304 int viewFlagValues = 0; 2305 int viewFlagMasks = 0; 2306 2307 boolean setScrollContainer = false; 2308 2309 int x = 0; 2310 int y = 0; 2311 2312 float tx = 0; 2313 float ty = 0; 2314 float rotation = 0; 2315 float rotationX = 0; 2316 float rotationY = 0; 2317 float sx = 1f; 2318 float sy = 1f; 2319 boolean transformSet = false; 2320 2321 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2322 2323 int overScrollMode = mOverScrollMode; 2324 final int N = a.getIndexCount(); 2325 for (int i = 0; i < N; i++) { 2326 int attr = a.getIndex(i); 2327 switch (attr) { 2328 case com.android.internal.R.styleable.View_background: 2329 background = a.getDrawable(attr); 2330 break; 2331 case com.android.internal.R.styleable.View_padding: 2332 padding = a.getDimensionPixelSize(attr, -1); 2333 break; 2334 case com.android.internal.R.styleable.View_paddingLeft: 2335 leftPadding = a.getDimensionPixelSize(attr, -1); 2336 break; 2337 case com.android.internal.R.styleable.View_paddingTop: 2338 topPadding = a.getDimensionPixelSize(attr, -1); 2339 break; 2340 case com.android.internal.R.styleable.View_paddingRight: 2341 rightPadding = a.getDimensionPixelSize(attr, -1); 2342 break; 2343 case com.android.internal.R.styleable.View_paddingBottom: 2344 bottomPadding = a.getDimensionPixelSize(attr, -1); 2345 break; 2346 case com.android.internal.R.styleable.View_scrollX: 2347 x = a.getDimensionPixelOffset(attr, 0); 2348 break; 2349 case com.android.internal.R.styleable.View_scrollY: 2350 y = a.getDimensionPixelOffset(attr, 0); 2351 break; 2352 case com.android.internal.R.styleable.View_alpha: 2353 setAlpha(a.getFloat(attr, 1f)); 2354 break; 2355 case com.android.internal.R.styleable.View_transformPivotX: 2356 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2357 break; 2358 case com.android.internal.R.styleable.View_transformPivotY: 2359 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2360 break; 2361 case com.android.internal.R.styleable.View_translationX: 2362 tx = a.getDimensionPixelOffset(attr, 0); 2363 transformSet = true; 2364 break; 2365 case com.android.internal.R.styleable.View_translationY: 2366 ty = a.getDimensionPixelOffset(attr, 0); 2367 transformSet = true; 2368 break; 2369 case com.android.internal.R.styleable.View_rotation: 2370 rotation = a.getFloat(attr, 0); 2371 transformSet = true; 2372 break; 2373 case com.android.internal.R.styleable.View_rotationX: 2374 rotationX = a.getFloat(attr, 0); 2375 transformSet = true; 2376 break; 2377 case com.android.internal.R.styleable.View_rotationY: 2378 rotationY = a.getFloat(attr, 0); 2379 transformSet = true; 2380 break; 2381 case com.android.internal.R.styleable.View_scaleX: 2382 sx = a.getFloat(attr, 1f); 2383 transformSet = true; 2384 break; 2385 case com.android.internal.R.styleable.View_scaleY: 2386 sy = a.getFloat(attr, 1f); 2387 transformSet = true; 2388 break; 2389 case com.android.internal.R.styleable.View_id: 2390 mID = a.getResourceId(attr, NO_ID); 2391 break; 2392 case com.android.internal.R.styleable.View_tag: 2393 mTag = a.getText(attr); 2394 break; 2395 case com.android.internal.R.styleable.View_fitsSystemWindows: 2396 if (a.getBoolean(attr, false)) { 2397 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2398 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2399 } 2400 break; 2401 case com.android.internal.R.styleable.View_focusable: 2402 if (a.getBoolean(attr, false)) { 2403 viewFlagValues |= FOCUSABLE; 2404 viewFlagMasks |= FOCUSABLE_MASK; 2405 } 2406 break; 2407 case com.android.internal.R.styleable.View_focusableInTouchMode: 2408 if (a.getBoolean(attr, false)) { 2409 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2410 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2411 } 2412 break; 2413 case com.android.internal.R.styleable.View_clickable: 2414 if (a.getBoolean(attr, false)) { 2415 viewFlagValues |= CLICKABLE; 2416 viewFlagMasks |= CLICKABLE; 2417 } 2418 break; 2419 case com.android.internal.R.styleable.View_longClickable: 2420 if (a.getBoolean(attr, false)) { 2421 viewFlagValues |= LONG_CLICKABLE; 2422 viewFlagMasks |= LONG_CLICKABLE; 2423 } 2424 break; 2425 case com.android.internal.R.styleable.View_saveEnabled: 2426 if (!a.getBoolean(attr, true)) { 2427 viewFlagValues |= SAVE_DISABLED; 2428 viewFlagMasks |= SAVE_DISABLED_MASK; 2429 } 2430 break; 2431 case com.android.internal.R.styleable.View_duplicateParentState: 2432 if (a.getBoolean(attr, false)) { 2433 viewFlagValues |= DUPLICATE_PARENT_STATE; 2434 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2435 } 2436 break; 2437 case com.android.internal.R.styleable.View_visibility: 2438 final int visibility = a.getInt(attr, 0); 2439 if (visibility != 0) { 2440 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2441 viewFlagMasks |= VISIBILITY_MASK; 2442 } 2443 break; 2444 case com.android.internal.R.styleable.View_drawingCacheQuality: 2445 final int cacheQuality = a.getInt(attr, 0); 2446 if (cacheQuality != 0) { 2447 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2448 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2449 } 2450 break; 2451 case com.android.internal.R.styleable.View_contentDescription: 2452 mContentDescription = a.getString(attr); 2453 break; 2454 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2455 if (!a.getBoolean(attr, true)) { 2456 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2457 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2458 } 2459 break; 2460 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2461 if (!a.getBoolean(attr, true)) { 2462 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2463 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2464 } 2465 break; 2466 case R.styleable.View_scrollbars: 2467 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2468 if (scrollbars != SCROLLBARS_NONE) { 2469 viewFlagValues |= scrollbars; 2470 viewFlagMasks |= SCROLLBARS_MASK; 2471 initializeScrollbars(a); 2472 } 2473 break; 2474 case R.styleable.View_fadingEdge: 2475 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2476 if (fadingEdge != FADING_EDGE_NONE) { 2477 viewFlagValues |= fadingEdge; 2478 viewFlagMasks |= FADING_EDGE_MASK; 2479 initializeFadingEdge(a); 2480 } 2481 break; 2482 case R.styleable.View_scrollbarStyle: 2483 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2484 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2485 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2486 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2487 } 2488 break; 2489 case R.styleable.View_isScrollContainer: 2490 setScrollContainer = true; 2491 if (a.getBoolean(attr, false)) { 2492 setScrollContainer(true); 2493 } 2494 break; 2495 case com.android.internal.R.styleable.View_keepScreenOn: 2496 if (a.getBoolean(attr, false)) { 2497 viewFlagValues |= KEEP_SCREEN_ON; 2498 viewFlagMasks |= KEEP_SCREEN_ON; 2499 } 2500 break; 2501 case R.styleable.View_filterTouchesWhenObscured: 2502 if (a.getBoolean(attr, false)) { 2503 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2504 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2505 } 2506 break; 2507 case R.styleable.View_nextFocusLeft: 2508 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2509 break; 2510 case R.styleable.View_nextFocusRight: 2511 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2512 break; 2513 case R.styleable.View_nextFocusUp: 2514 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2515 break; 2516 case R.styleable.View_nextFocusDown: 2517 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2518 break; 2519 case R.styleable.View_nextFocusForward: 2520 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2521 break; 2522 case R.styleable.View_minWidth: 2523 mMinWidth = a.getDimensionPixelSize(attr, 0); 2524 break; 2525 case R.styleable.View_minHeight: 2526 mMinHeight = a.getDimensionPixelSize(attr, 0); 2527 break; 2528 case R.styleable.View_onClick: 2529 if (context.isRestricted()) { 2530 throw new IllegalStateException("The android:onClick attribute cannot " 2531 + "be used within a restricted context"); 2532 } 2533 2534 final String handlerName = a.getString(attr); 2535 if (handlerName != null) { 2536 setOnClickListener(new OnClickListener() { 2537 private Method mHandler; 2538 2539 public void onClick(View v) { 2540 if (mHandler == null) { 2541 try { 2542 mHandler = getContext().getClass().getMethod(handlerName, 2543 View.class); 2544 } catch (NoSuchMethodException e) { 2545 int id = getId(); 2546 String idText = id == NO_ID ? "" : " with id '" 2547 + getContext().getResources().getResourceEntryName( 2548 id) + "'"; 2549 throw new IllegalStateException("Could not find a method " + 2550 handlerName + "(View) in the activity " 2551 + getContext().getClass() + " for onClick handler" 2552 + " on view " + View.this.getClass() + idText, e); 2553 } 2554 } 2555 2556 try { 2557 mHandler.invoke(getContext(), View.this); 2558 } catch (IllegalAccessException e) { 2559 throw new IllegalStateException("Could not execute non " 2560 + "public method of the activity", e); 2561 } catch (InvocationTargetException e) { 2562 throw new IllegalStateException("Could not execute " 2563 + "method of the activity", e); 2564 } 2565 } 2566 }); 2567 } 2568 break; 2569 case R.styleable.View_overScrollMode: 2570 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2571 break; 2572 case R.styleable.View_verticalScrollbarPosition: 2573 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2574 break; 2575 case R.styleable.View_layerType: 2576 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2577 break; 2578 } 2579 } 2580 2581 setOverScrollMode(overScrollMode); 2582 2583 if (background != null) { 2584 setBackgroundDrawable(background); 2585 } 2586 2587 if (padding >= 0) { 2588 leftPadding = padding; 2589 topPadding = padding; 2590 rightPadding = padding; 2591 bottomPadding = padding; 2592 } 2593 2594 // If the user specified the padding (either with android:padding or 2595 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2596 // use the default padding or the padding from the background drawable 2597 // (stored at this point in mPadding*) 2598 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2599 topPadding >= 0 ? topPadding : mPaddingTop, 2600 rightPadding >= 0 ? rightPadding : mPaddingRight, 2601 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2602 2603 if (viewFlagMasks != 0) { 2604 setFlags(viewFlagValues, viewFlagMasks); 2605 } 2606 2607 // Needs to be called after mViewFlags is set 2608 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2609 recomputePadding(); 2610 } 2611 2612 if (x != 0 || y != 0) { 2613 scrollTo(x, y); 2614 } 2615 2616 if (transformSet) { 2617 setTranslationX(tx); 2618 setTranslationY(ty); 2619 setRotation(rotation); 2620 setRotationX(rotationX); 2621 setRotationY(rotationY); 2622 setScaleX(sx); 2623 setScaleY(sy); 2624 } 2625 2626 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2627 setScrollContainer(true); 2628 } 2629 2630 computeOpaqueFlags(); 2631 2632 a.recycle(); 2633 } 2634 2635 /** 2636 * Non-public constructor for use in testing 2637 */ 2638 View() { 2639 } 2640 2641 /** 2642 * <p> 2643 * Initializes the fading edges from a given set of styled attributes. This 2644 * method should be called by subclasses that need fading edges and when an 2645 * instance of these subclasses is created programmatically rather than 2646 * being inflated from XML. This method is automatically called when the XML 2647 * is inflated. 2648 * </p> 2649 * 2650 * @param a the styled attributes set to initialize the fading edges from 2651 */ 2652 protected void initializeFadingEdge(TypedArray a) { 2653 initScrollCache(); 2654 2655 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2656 R.styleable.View_fadingEdgeLength, 2657 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2658 } 2659 2660 /** 2661 * Returns the size of the vertical faded edges used to indicate that more 2662 * content in this view is visible. 2663 * 2664 * @return The size in pixels of the vertical faded edge or 0 if vertical 2665 * faded edges are not enabled for this view. 2666 * @attr ref android.R.styleable#View_fadingEdgeLength 2667 */ 2668 public int getVerticalFadingEdgeLength() { 2669 if (isVerticalFadingEdgeEnabled()) { 2670 ScrollabilityCache cache = mScrollCache; 2671 if (cache != null) { 2672 return cache.fadingEdgeLength; 2673 } 2674 } 2675 return 0; 2676 } 2677 2678 /** 2679 * Set the size of the faded edge used to indicate that more content in this 2680 * view is available. Will not change whether the fading edge is enabled; use 2681 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2682 * to enable the fading edge for the vertical or horizontal fading edges. 2683 * 2684 * @param length The size in pixels of the faded edge used to indicate that more 2685 * content in this view is visible. 2686 */ 2687 public void setFadingEdgeLength(int length) { 2688 initScrollCache(); 2689 mScrollCache.fadingEdgeLength = length; 2690 } 2691 2692 /** 2693 * Returns the size of the horizontal faded edges used to indicate that more 2694 * content in this view is visible. 2695 * 2696 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2697 * faded edges are not enabled for this view. 2698 * @attr ref android.R.styleable#View_fadingEdgeLength 2699 */ 2700 public int getHorizontalFadingEdgeLength() { 2701 if (isHorizontalFadingEdgeEnabled()) { 2702 ScrollabilityCache cache = mScrollCache; 2703 if (cache != null) { 2704 return cache.fadingEdgeLength; 2705 } 2706 } 2707 return 0; 2708 } 2709 2710 /** 2711 * Returns the width of the vertical scrollbar. 2712 * 2713 * @return The width in pixels of the vertical scrollbar or 0 if there 2714 * is no vertical scrollbar. 2715 */ 2716 public int getVerticalScrollbarWidth() { 2717 ScrollabilityCache cache = mScrollCache; 2718 if (cache != null) { 2719 ScrollBarDrawable scrollBar = cache.scrollBar; 2720 if (scrollBar != null) { 2721 int size = scrollBar.getSize(true); 2722 if (size <= 0) { 2723 size = cache.scrollBarSize; 2724 } 2725 return size; 2726 } 2727 return 0; 2728 } 2729 return 0; 2730 } 2731 2732 /** 2733 * Returns the height of the horizontal scrollbar. 2734 * 2735 * @return The height in pixels of the horizontal scrollbar or 0 if 2736 * there is no horizontal scrollbar. 2737 */ 2738 protected int getHorizontalScrollbarHeight() { 2739 ScrollabilityCache cache = mScrollCache; 2740 if (cache != null) { 2741 ScrollBarDrawable scrollBar = cache.scrollBar; 2742 if (scrollBar != null) { 2743 int size = scrollBar.getSize(false); 2744 if (size <= 0) { 2745 size = cache.scrollBarSize; 2746 } 2747 return size; 2748 } 2749 return 0; 2750 } 2751 return 0; 2752 } 2753 2754 /** 2755 * <p> 2756 * Initializes the scrollbars from a given set of styled attributes. This 2757 * method should be called by subclasses that need scrollbars and when an 2758 * instance of these subclasses is created programmatically rather than 2759 * being inflated from XML. This method is automatically called when the XML 2760 * is inflated. 2761 * </p> 2762 * 2763 * @param a the styled attributes set to initialize the scrollbars from 2764 */ 2765 protected void initializeScrollbars(TypedArray a) { 2766 initScrollCache(); 2767 2768 final ScrollabilityCache scrollabilityCache = mScrollCache; 2769 2770 if (scrollabilityCache.scrollBar == null) { 2771 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2772 } 2773 2774 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2775 2776 if (!fadeScrollbars) { 2777 scrollabilityCache.state = ScrollabilityCache.ON; 2778 } 2779 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2780 2781 2782 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2783 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2784 .getScrollBarFadeDuration()); 2785 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2786 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2787 ViewConfiguration.getScrollDefaultDelay()); 2788 2789 2790 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2791 com.android.internal.R.styleable.View_scrollbarSize, 2792 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2793 2794 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2795 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2796 2797 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2798 if (thumb != null) { 2799 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2800 } 2801 2802 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2803 false); 2804 if (alwaysDraw) { 2805 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2806 } 2807 2808 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2809 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2810 2811 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2812 if (thumb != null) { 2813 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2814 } 2815 2816 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2817 false); 2818 if (alwaysDraw) { 2819 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2820 } 2821 2822 // Re-apply user/background padding so that scrollbar(s) get added 2823 recomputePadding(); 2824 } 2825 2826 /** 2827 * <p> 2828 * Initalizes the scrollability cache if necessary. 2829 * </p> 2830 */ 2831 private void initScrollCache() { 2832 if (mScrollCache == null) { 2833 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2834 } 2835 } 2836 2837 /** 2838 * Set the position of the vertical scroll bar. Should be one of 2839 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 2840 * {@link #SCROLLBAR_POSITION_RIGHT}. 2841 * 2842 * @param position Where the vertical scroll bar should be positioned. 2843 */ 2844 public void setVerticalScrollbarPosition(int position) { 2845 if (mVerticalScrollbarPosition != position) { 2846 mVerticalScrollbarPosition = position; 2847 computeOpaqueFlags(); 2848 recomputePadding(); 2849 } 2850 } 2851 2852 /** 2853 * @return The position where the vertical scroll bar will show, if applicable. 2854 * @see #setVerticalScrollbarPosition(int) 2855 */ 2856 public int getVerticalScrollbarPosition() { 2857 return mVerticalScrollbarPosition; 2858 } 2859 2860 /** 2861 * Register a callback to be invoked when focus of this view changed. 2862 * 2863 * @param l The callback that will run. 2864 */ 2865 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2866 mOnFocusChangeListener = l; 2867 } 2868 2869 /** 2870 * Add a listener that will be called when the bounds of the view change due to 2871 * layout processing. 2872 * 2873 * @param listener The listener that will be called when layout bounds change. 2874 */ 2875 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 2876 if (mOnLayoutChangeListeners == null) { 2877 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 2878 } 2879 mOnLayoutChangeListeners.add(listener); 2880 } 2881 2882 /** 2883 * Remove a listener for layout changes. 2884 * 2885 * @param listener The listener for layout bounds change. 2886 */ 2887 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 2888 if (mOnLayoutChangeListeners == null) { 2889 return; 2890 } 2891 mOnLayoutChangeListeners.remove(listener); 2892 } 2893 2894 /** 2895 * Gets the current list of listeners for layout changes. 2896 */ 2897 public List<OnLayoutChangeListener> getOnLayoutChangeListeners() { 2898 return mOnLayoutChangeListeners; 2899 } 2900 2901 /** 2902 * Returns the focus-change callback registered for this view. 2903 * 2904 * @return The callback, or null if one is not registered. 2905 */ 2906 public OnFocusChangeListener getOnFocusChangeListener() { 2907 return mOnFocusChangeListener; 2908 } 2909 2910 /** 2911 * Register a callback to be invoked when this view is clicked. If this view is not 2912 * clickable, it becomes clickable. 2913 * 2914 * @param l The callback that will run 2915 * 2916 * @see #setClickable(boolean) 2917 */ 2918 public void setOnClickListener(OnClickListener l) { 2919 if (!isClickable()) { 2920 setClickable(true); 2921 } 2922 mOnClickListener = l; 2923 } 2924 2925 /** 2926 * Register a callback to be invoked when this view is clicked and held. If this view is not 2927 * long clickable, it becomes long clickable. 2928 * 2929 * @param l The callback that will run 2930 * 2931 * @see #setLongClickable(boolean) 2932 */ 2933 public void setOnLongClickListener(OnLongClickListener l) { 2934 if (!isLongClickable()) { 2935 setLongClickable(true); 2936 } 2937 mOnLongClickListener = l; 2938 } 2939 2940 /** 2941 * Register a callback to be invoked when the context menu for this view is 2942 * being built. If this view is not long clickable, it becomes long clickable. 2943 * 2944 * @param l The callback that will run 2945 * 2946 */ 2947 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 2948 if (!isLongClickable()) { 2949 setLongClickable(true); 2950 } 2951 mOnCreateContextMenuListener = l; 2952 } 2953 2954 /** 2955 * Call this view's OnClickListener, if it is defined. 2956 * 2957 * @return True there was an assigned OnClickListener that was called, false 2958 * otherwise is returned. 2959 */ 2960 public boolean performClick() { 2961 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 2962 2963 if (mOnClickListener != null) { 2964 playSoundEffect(SoundEffectConstants.CLICK); 2965 mOnClickListener.onClick(this); 2966 return true; 2967 } 2968 2969 return false; 2970 } 2971 2972 /** 2973 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 2974 * OnLongClickListener did not consume the event. 2975 * 2976 * @return True if one of the above receivers consumed the event, false otherwise. 2977 */ 2978 public boolean performLongClick() { 2979 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 2980 2981 boolean handled = false; 2982 if (mOnLongClickListener != null) { 2983 handled = mOnLongClickListener.onLongClick(View.this); 2984 } 2985 if (!handled) { 2986 handled = showContextMenu(); 2987 } 2988 if (handled) { 2989 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 2990 } 2991 return handled; 2992 } 2993 2994 /** 2995 * Bring up the context menu for this view. 2996 * 2997 * @return Whether a context menu was displayed. 2998 */ 2999 public boolean showContextMenu() { 3000 return getParent().showContextMenuForChild(this); 3001 } 3002 3003 /** 3004 * Start an action mode. 3005 * 3006 * @param callback Callback that will control the lifecycle of the action mode 3007 * @return The new action mode if it is started, null otherwise 3008 * 3009 * @see ActionMode 3010 */ 3011 public ActionMode startActionMode(ActionMode.Callback callback) { 3012 return getParent().startActionModeForChild(this, callback); 3013 } 3014 3015 /** 3016 * Register a callback to be invoked when a key is pressed in this view. 3017 * @param l the key listener to attach to this view 3018 */ 3019 public void setOnKeyListener(OnKeyListener l) { 3020 mOnKeyListener = l; 3021 } 3022 3023 /** 3024 * Register a callback to be invoked when a touch event is sent to this view. 3025 * @param l the touch listener to attach to this view 3026 */ 3027 public void setOnTouchListener(OnTouchListener l) { 3028 mOnTouchListener = l; 3029 } 3030 3031 /** 3032 * Register a callback to be invoked when a drag event is sent to this view. 3033 * @param l The drag listener to attach to this view 3034 */ 3035 public void setOnDragListener(OnDragListener l) { 3036 mOnDragListener = l; 3037 } 3038 3039 /** 3040 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 3041 * 3042 * Note: this does not check whether this {@link View} should get focus, it just 3043 * gives it focus no matter what. It should only be called internally by framework 3044 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3045 * 3046 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 3047 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 3048 * focus moved when requestFocus() is called. It may not always 3049 * apply, in which case use the default View.FOCUS_DOWN. 3050 * @param previouslyFocusedRect The rectangle of the view that had focus 3051 * prior in this View's coordinate system. 3052 */ 3053 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3054 if (DBG) { 3055 System.out.println(this + " requestFocus()"); 3056 } 3057 3058 if ((mPrivateFlags & FOCUSED) == 0) { 3059 mPrivateFlags |= FOCUSED; 3060 3061 if (mParent != null) { 3062 mParent.requestChildFocus(this, this); 3063 } 3064 3065 onFocusChanged(true, direction, previouslyFocusedRect); 3066 refreshDrawableState(); 3067 } 3068 } 3069 3070 /** 3071 * Request that a rectangle of this view be visible on the screen, 3072 * scrolling if necessary just enough. 3073 * 3074 * <p>A View should call this if it maintains some notion of which part 3075 * of its content is interesting. For example, a text editing view 3076 * should call this when its cursor moves. 3077 * 3078 * @param rectangle The rectangle. 3079 * @return Whether any parent scrolled. 3080 */ 3081 public boolean requestRectangleOnScreen(Rect rectangle) { 3082 return requestRectangleOnScreen(rectangle, false); 3083 } 3084 3085 /** 3086 * Request that a rectangle of this view be visible on the screen, 3087 * scrolling if necessary just enough. 3088 * 3089 * <p>A View should call this if it maintains some notion of which part 3090 * of its content is interesting. For example, a text editing view 3091 * should call this when its cursor moves. 3092 * 3093 * <p>When <code>immediate</code> is set to true, scrolling will not be 3094 * animated. 3095 * 3096 * @param rectangle The rectangle. 3097 * @param immediate True to forbid animated scrolling, false otherwise 3098 * @return Whether any parent scrolled. 3099 */ 3100 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3101 View child = this; 3102 ViewParent parent = mParent; 3103 boolean scrolled = false; 3104 while (parent != null) { 3105 scrolled |= parent.requestChildRectangleOnScreen(child, 3106 rectangle, immediate); 3107 3108 // offset rect so next call has the rectangle in the 3109 // coordinate system of its direct child. 3110 rectangle.offset(child.getLeft(), child.getTop()); 3111 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3112 3113 if (!(parent instanceof View)) { 3114 break; 3115 } 3116 3117 child = (View) parent; 3118 parent = child.getParent(); 3119 } 3120 return scrolled; 3121 } 3122 3123 /** 3124 * Called when this view wants to give up focus. This will cause 3125 * {@link #onFocusChanged} to be called. 3126 */ 3127 public void clearFocus() { 3128 if (DBG) { 3129 System.out.println(this + " clearFocus()"); 3130 } 3131 3132 if ((mPrivateFlags & FOCUSED) != 0) { 3133 mPrivateFlags &= ~FOCUSED; 3134 3135 if (mParent != null) { 3136 mParent.clearChildFocus(this); 3137 } 3138 3139 onFocusChanged(false, 0, null); 3140 refreshDrawableState(); 3141 } 3142 } 3143 3144 /** 3145 * Called to clear the focus of a view that is about to be removed. 3146 * Doesn't call clearChildFocus, which prevents this view from taking 3147 * focus again before it has been removed from the parent 3148 */ 3149 void clearFocusForRemoval() { 3150 if ((mPrivateFlags & FOCUSED) != 0) { 3151 mPrivateFlags &= ~FOCUSED; 3152 3153 onFocusChanged(false, 0, null); 3154 refreshDrawableState(); 3155 } 3156 } 3157 3158 /** 3159 * Called internally by the view system when a new view is getting focus. 3160 * This is what clears the old focus. 3161 */ 3162 void unFocus() { 3163 if (DBG) { 3164 System.out.println(this + " unFocus()"); 3165 } 3166 3167 if ((mPrivateFlags & FOCUSED) != 0) { 3168 mPrivateFlags &= ~FOCUSED; 3169 3170 onFocusChanged(false, 0, null); 3171 refreshDrawableState(); 3172 } 3173 } 3174 3175 /** 3176 * Returns true if this view has focus iteself, or is the ancestor of the 3177 * view that has focus. 3178 * 3179 * @return True if this view has or contains focus, false otherwise. 3180 */ 3181 @ViewDebug.ExportedProperty(category = "focus") 3182 public boolean hasFocus() { 3183 return (mPrivateFlags & FOCUSED) != 0; 3184 } 3185 3186 /** 3187 * Returns true if this view is focusable or if it contains a reachable View 3188 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3189 * is a View whose parents do not block descendants focus. 3190 * 3191 * Only {@link #VISIBLE} views are considered focusable. 3192 * 3193 * @return True if the view is focusable or if the view contains a focusable 3194 * View, false otherwise. 3195 * 3196 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3197 */ 3198 public boolean hasFocusable() { 3199 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3200 } 3201 3202 /** 3203 * Called by the view system when the focus state of this view changes. 3204 * When the focus change event is caused by directional navigation, direction 3205 * and previouslyFocusedRect provide insight into where the focus is coming from. 3206 * When overriding, be sure to call up through to the super class so that 3207 * the standard focus handling will occur. 3208 * 3209 * @param gainFocus True if the View has focus; false otherwise. 3210 * @param direction The direction focus has moved when requestFocus() 3211 * is called to give this view focus. Values are 3212 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3213 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3214 * It may not always apply, in which case use the default. 3215 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3216 * system, of the previously focused view. If applicable, this will be 3217 * passed in as finer grained information about where the focus is coming 3218 * from (in addition to direction). Will be <code>null</code> otherwise. 3219 */ 3220 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3221 if (gainFocus) { 3222 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3223 } 3224 3225 InputMethodManager imm = InputMethodManager.peekInstance(); 3226 if (!gainFocus) { 3227 if (isPressed()) { 3228 setPressed(false); 3229 } 3230 if (imm != null && mAttachInfo != null 3231 && mAttachInfo.mHasWindowFocus) { 3232 imm.focusOut(this); 3233 } 3234 onFocusLost(); 3235 } else if (imm != null && mAttachInfo != null 3236 && mAttachInfo.mHasWindowFocus) { 3237 imm.focusIn(this); 3238 } 3239 3240 invalidate(); 3241 if (mOnFocusChangeListener != null) { 3242 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3243 } 3244 3245 if (mAttachInfo != null) { 3246 mAttachInfo.mKeyDispatchState.reset(this); 3247 } 3248 } 3249 3250 /** 3251 * {@inheritDoc} 3252 */ 3253 public void sendAccessibilityEvent(int eventType) { 3254 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3255 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3256 } 3257 } 3258 3259 /** 3260 * {@inheritDoc} 3261 */ 3262 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3263 if (!isShown()) { 3264 return; 3265 } 3266 event.setClassName(getClass().getName()); 3267 event.setPackageName(getContext().getPackageName()); 3268 event.setEnabled(isEnabled()); 3269 event.setContentDescription(mContentDescription); 3270 3271 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3272 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3273 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3274 event.setItemCount(focusablesTempList.size()); 3275 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3276 focusablesTempList.clear(); 3277 } 3278 3279 dispatchPopulateAccessibilityEvent(event); 3280 3281 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 3282 } 3283 3284 /** 3285 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 3286 * to be populated. 3287 * 3288 * @param event The event. 3289 * 3290 * @return True if the event population was completed. 3291 */ 3292 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3293 return false; 3294 } 3295 3296 /** 3297 * Gets the {@link View} description. It briefly describes the view and is 3298 * primarily used for accessibility support. Set this property to enable 3299 * better accessibility support for your application. This is especially 3300 * true for views that do not have textual representation (For example, 3301 * ImageButton). 3302 * 3303 * @return The content descriptiopn. 3304 * 3305 * @attr ref android.R.styleable#View_contentDescription 3306 */ 3307 public CharSequence getContentDescription() { 3308 return mContentDescription; 3309 } 3310 3311 /** 3312 * Sets the {@link View} description. It briefly describes the view and is 3313 * primarily used for accessibility support. Set this property to enable 3314 * better accessibility support for your application. This is especially 3315 * true for views that do not have textual representation (For example, 3316 * ImageButton). 3317 * 3318 * @param contentDescription The content description. 3319 * 3320 * @attr ref android.R.styleable#View_contentDescription 3321 */ 3322 public void setContentDescription(CharSequence contentDescription) { 3323 mContentDescription = contentDescription; 3324 } 3325 3326 /** 3327 * Invoked whenever this view loses focus, either by losing window focus or by losing 3328 * focus within its window. This method can be used to clear any state tied to the 3329 * focus. For instance, if a button is held pressed with the trackball and the window 3330 * loses focus, this method can be used to cancel the press. 3331 * 3332 * Subclasses of View overriding this method should always call super.onFocusLost(). 3333 * 3334 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3335 * @see #onWindowFocusChanged(boolean) 3336 * 3337 * @hide pending API council approval 3338 */ 3339 protected void onFocusLost() { 3340 resetPressedState(); 3341 } 3342 3343 private void resetPressedState() { 3344 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3345 return; 3346 } 3347 3348 if (isPressed()) { 3349 setPressed(false); 3350 3351 if (!mHasPerformedLongPress) { 3352 removeLongPressCallback(); 3353 } 3354 } 3355 } 3356 3357 /** 3358 * Returns true if this view has focus 3359 * 3360 * @return True if this view has focus, false otherwise. 3361 */ 3362 @ViewDebug.ExportedProperty(category = "focus") 3363 public boolean isFocused() { 3364 return (mPrivateFlags & FOCUSED) != 0; 3365 } 3366 3367 /** 3368 * Find the view in the hierarchy rooted at this view that currently has 3369 * focus. 3370 * 3371 * @return The view that currently has focus, or null if no focused view can 3372 * be found. 3373 */ 3374 public View findFocus() { 3375 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3376 } 3377 3378 /** 3379 * Change whether this view is one of the set of scrollable containers in 3380 * its window. This will be used to determine whether the window can 3381 * resize or must pan when a soft input area is open -- scrollable 3382 * containers allow the window to use resize mode since the container 3383 * will appropriately shrink. 3384 */ 3385 public void setScrollContainer(boolean isScrollContainer) { 3386 if (isScrollContainer) { 3387 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3388 mAttachInfo.mScrollContainers.add(this); 3389 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3390 } 3391 mPrivateFlags |= SCROLL_CONTAINER; 3392 } else { 3393 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3394 mAttachInfo.mScrollContainers.remove(this); 3395 } 3396 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3397 } 3398 } 3399 3400 /** 3401 * Returns the quality of the drawing cache. 3402 * 3403 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3404 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3405 * 3406 * @see #setDrawingCacheQuality(int) 3407 * @see #setDrawingCacheEnabled(boolean) 3408 * @see #isDrawingCacheEnabled() 3409 * 3410 * @attr ref android.R.styleable#View_drawingCacheQuality 3411 */ 3412 public int getDrawingCacheQuality() { 3413 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3414 } 3415 3416 /** 3417 * Set the drawing cache quality of this view. This value is used only when the 3418 * drawing cache is enabled 3419 * 3420 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3421 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3422 * 3423 * @see #getDrawingCacheQuality() 3424 * @see #setDrawingCacheEnabled(boolean) 3425 * @see #isDrawingCacheEnabled() 3426 * 3427 * @attr ref android.R.styleable#View_drawingCacheQuality 3428 */ 3429 public void setDrawingCacheQuality(int quality) { 3430 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3431 } 3432 3433 /** 3434 * Returns whether the screen should remain on, corresponding to the current 3435 * value of {@link #KEEP_SCREEN_ON}. 3436 * 3437 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3438 * 3439 * @see #setKeepScreenOn(boolean) 3440 * 3441 * @attr ref android.R.styleable#View_keepScreenOn 3442 */ 3443 public boolean getKeepScreenOn() { 3444 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3445 } 3446 3447 /** 3448 * Controls whether the screen should remain on, modifying the 3449 * value of {@link #KEEP_SCREEN_ON}. 3450 * 3451 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3452 * 3453 * @see #getKeepScreenOn() 3454 * 3455 * @attr ref android.R.styleable#View_keepScreenOn 3456 */ 3457 public void setKeepScreenOn(boolean keepScreenOn) { 3458 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3459 } 3460 3461 /** 3462 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3463 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3464 * 3465 * @attr ref android.R.styleable#View_nextFocusLeft 3466 */ 3467 public int getNextFocusLeftId() { 3468 return mNextFocusLeftId; 3469 } 3470 3471 /** 3472 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3473 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3474 * decide automatically. 3475 * 3476 * @attr ref android.R.styleable#View_nextFocusLeft 3477 */ 3478 public void setNextFocusLeftId(int nextFocusLeftId) { 3479 mNextFocusLeftId = nextFocusLeftId; 3480 } 3481 3482 /** 3483 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3484 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3485 * 3486 * @attr ref android.R.styleable#View_nextFocusRight 3487 */ 3488 public int getNextFocusRightId() { 3489 return mNextFocusRightId; 3490 } 3491 3492 /** 3493 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3494 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3495 * decide automatically. 3496 * 3497 * @attr ref android.R.styleable#View_nextFocusRight 3498 */ 3499 public void setNextFocusRightId(int nextFocusRightId) { 3500 mNextFocusRightId = nextFocusRightId; 3501 } 3502 3503 /** 3504 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3505 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3506 * 3507 * @attr ref android.R.styleable#View_nextFocusUp 3508 */ 3509 public int getNextFocusUpId() { 3510 return mNextFocusUpId; 3511 } 3512 3513 /** 3514 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3515 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 3516 * decide automatically. 3517 * 3518 * @attr ref android.R.styleable#View_nextFocusUp 3519 */ 3520 public void setNextFocusUpId(int nextFocusUpId) { 3521 mNextFocusUpId = nextFocusUpId; 3522 } 3523 3524 /** 3525 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3526 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3527 * 3528 * @attr ref android.R.styleable#View_nextFocusDown 3529 */ 3530 public int getNextFocusDownId() { 3531 return mNextFocusDownId; 3532 } 3533 3534 /** 3535 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3536 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 3537 * decide automatically. 3538 * 3539 * @attr ref android.R.styleable#View_nextFocusDown 3540 */ 3541 public void setNextFocusDownId(int nextFocusDownId) { 3542 mNextFocusDownId = nextFocusDownId; 3543 } 3544 3545 /** 3546 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3547 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3548 * 3549 * @attr ref android.R.styleable#View_nextFocusForward 3550 */ 3551 public int getNextFocusForwardId() { 3552 return mNextFocusForwardId; 3553 } 3554 3555 /** 3556 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3557 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 3558 * decide automatically. 3559 * 3560 * @attr ref android.R.styleable#View_nextFocusForward 3561 */ 3562 public void setNextFocusForwardId(int nextFocusForwardId) { 3563 mNextFocusForwardId = nextFocusForwardId; 3564 } 3565 3566 /** 3567 * Returns the visibility of this view and all of its ancestors 3568 * 3569 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3570 */ 3571 public boolean isShown() { 3572 View current = this; 3573 //noinspection ConstantConditions 3574 do { 3575 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3576 return false; 3577 } 3578 ViewParent parent = current.mParent; 3579 if (parent == null) { 3580 return false; // We are not attached to the view root 3581 } 3582 if (!(parent instanceof View)) { 3583 return true; 3584 } 3585 current = (View) parent; 3586 } while (current != null); 3587 3588 return false; 3589 } 3590 3591 /** 3592 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3593 * is set 3594 * 3595 * @param insets Insets for system windows 3596 * 3597 * @return True if this view applied the insets, false otherwise 3598 */ 3599 protected boolean fitSystemWindows(Rect insets) { 3600 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3601 mPaddingLeft = insets.left; 3602 mPaddingTop = insets.top; 3603 mPaddingRight = insets.right; 3604 mPaddingBottom = insets.bottom; 3605 requestLayout(); 3606 return true; 3607 } 3608 return false; 3609 } 3610 3611 /** 3612 * Determine if this view has the FITS_SYSTEM_WINDOWS flag set. 3613 * @return True if window has FITS_SYSTEM_WINDOWS set 3614 * 3615 * @hide 3616 */ 3617 public boolean isFitsSystemWindowsFlagSet() { 3618 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 3619 } 3620 3621 /** 3622 * Returns the visibility status for this view. 3623 * 3624 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3625 * @attr ref android.R.styleable#View_visibility 3626 */ 3627 @ViewDebug.ExportedProperty(mapping = { 3628 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3629 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3630 @ViewDebug.IntToString(from = GONE, to = "GONE") 3631 }) 3632 public int getVisibility() { 3633 return mViewFlags & VISIBILITY_MASK; 3634 } 3635 3636 /** 3637 * Set the enabled state of this view. 3638 * 3639 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3640 * @attr ref android.R.styleable#View_visibility 3641 */ 3642 @RemotableViewMethod 3643 public void setVisibility(int visibility) { 3644 setFlags(visibility, VISIBILITY_MASK); 3645 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3646 } 3647 3648 /** 3649 * Returns the enabled status for this view. The interpretation of the 3650 * enabled state varies by subclass. 3651 * 3652 * @return True if this view is enabled, false otherwise. 3653 */ 3654 @ViewDebug.ExportedProperty 3655 public boolean isEnabled() { 3656 return (mViewFlags & ENABLED_MASK) == ENABLED; 3657 } 3658 3659 /** 3660 * Set the enabled state of this view. The interpretation of the enabled 3661 * state varies by subclass. 3662 * 3663 * @param enabled True if this view is enabled, false otherwise. 3664 */ 3665 @RemotableViewMethod 3666 public void setEnabled(boolean enabled) { 3667 if (enabled == isEnabled()) return; 3668 3669 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3670 3671 /* 3672 * The View most likely has to change its appearance, so refresh 3673 * the drawable state. 3674 */ 3675 refreshDrawableState(); 3676 3677 // Invalidate too, since the default behavior for views is to be 3678 // be drawn at 50% alpha rather than to change the drawable. 3679 invalidate(); 3680 } 3681 3682 /** 3683 * Set whether this view can receive the focus. 3684 * 3685 * Setting this to false will also ensure that this view is not focusable 3686 * in touch mode. 3687 * 3688 * @param focusable If true, this view can receive the focus. 3689 * 3690 * @see #setFocusableInTouchMode(boolean) 3691 * @attr ref android.R.styleable#View_focusable 3692 */ 3693 public void setFocusable(boolean focusable) { 3694 if (!focusable) { 3695 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3696 } 3697 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3698 } 3699 3700 /** 3701 * Set whether this view can receive focus while in touch mode. 3702 * 3703 * Setting this to true will also ensure that this view is focusable. 3704 * 3705 * @param focusableInTouchMode If true, this view can receive the focus while 3706 * in touch mode. 3707 * 3708 * @see #setFocusable(boolean) 3709 * @attr ref android.R.styleable#View_focusableInTouchMode 3710 */ 3711 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3712 // Focusable in touch mode should always be set before the focusable flag 3713 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3714 // which, in touch mode, will not successfully request focus on this view 3715 // because the focusable in touch mode flag is not set 3716 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3717 if (focusableInTouchMode) { 3718 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3719 } 3720 } 3721 3722 /** 3723 * Set whether this view should have sound effects enabled for events such as 3724 * clicking and touching. 3725 * 3726 * <p>You may wish to disable sound effects for a view if you already play sounds, 3727 * for instance, a dial key that plays dtmf tones. 3728 * 3729 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3730 * @see #isSoundEffectsEnabled() 3731 * @see #playSoundEffect(int) 3732 * @attr ref android.R.styleable#View_soundEffectsEnabled 3733 */ 3734 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3735 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3736 } 3737 3738 /** 3739 * @return whether this view should have sound effects enabled for events such as 3740 * clicking and touching. 3741 * 3742 * @see #setSoundEffectsEnabled(boolean) 3743 * @see #playSoundEffect(int) 3744 * @attr ref android.R.styleable#View_soundEffectsEnabled 3745 */ 3746 @ViewDebug.ExportedProperty 3747 public boolean isSoundEffectsEnabled() { 3748 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3749 } 3750 3751 /** 3752 * Set whether this view should have haptic feedback for events such as 3753 * long presses. 3754 * 3755 * <p>You may wish to disable haptic feedback if your view already controls 3756 * its own haptic feedback. 3757 * 3758 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3759 * @see #isHapticFeedbackEnabled() 3760 * @see #performHapticFeedback(int) 3761 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3762 */ 3763 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3764 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3765 } 3766 3767 /** 3768 * @return whether this view should have haptic feedback enabled for events 3769 * long presses. 3770 * 3771 * @see #setHapticFeedbackEnabled(boolean) 3772 * @see #performHapticFeedback(int) 3773 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3774 */ 3775 @ViewDebug.ExportedProperty 3776 public boolean isHapticFeedbackEnabled() { 3777 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3778 } 3779 3780 /** 3781 * If this view doesn't do any drawing on its own, set this flag to 3782 * allow further optimizations. By default, this flag is not set on 3783 * View, but could be set on some View subclasses such as ViewGroup. 3784 * 3785 * Typically, if you override {@link #onDraw} you should clear this flag. 3786 * 3787 * @param willNotDraw whether or not this View draw on its own 3788 */ 3789 public void setWillNotDraw(boolean willNotDraw) { 3790 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3791 } 3792 3793 /** 3794 * Returns whether or not this View draws on its own. 3795 * 3796 * @return true if this view has nothing to draw, false otherwise 3797 */ 3798 @ViewDebug.ExportedProperty(category = "drawing") 3799 public boolean willNotDraw() { 3800 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3801 } 3802 3803 /** 3804 * When a View's drawing cache is enabled, drawing is redirected to an 3805 * offscreen bitmap. Some views, like an ImageView, must be able to 3806 * bypass this mechanism if they already draw a single bitmap, to avoid 3807 * unnecessary usage of the memory. 3808 * 3809 * @param willNotCacheDrawing true if this view does not cache its 3810 * drawing, false otherwise 3811 */ 3812 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3813 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3814 } 3815 3816 /** 3817 * Returns whether or not this View can cache its drawing or not. 3818 * 3819 * @return true if this view does not cache its drawing, false otherwise 3820 */ 3821 @ViewDebug.ExportedProperty(category = "drawing") 3822 public boolean willNotCacheDrawing() { 3823 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3824 } 3825 3826 /** 3827 * Indicates whether this view reacts to click events or not. 3828 * 3829 * @return true if the view is clickable, false otherwise 3830 * 3831 * @see #setClickable(boolean) 3832 * @attr ref android.R.styleable#View_clickable 3833 */ 3834 @ViewDebug.ExportedProperty 3835 public boolean isClickable() { 3836 return (mViewFlags & CLICKABLE) == CLICKABLE; 3837 } 3838 3839 /** 3840 * Enables or disables click events for this view. When a view 3841 * is clickable it will change its state to "pressed" on every click. 3842 * Subclasses should set the view clickable to visually react to 3843 * user's clicks. 3844 * 3845 * @param clickable true to make the view clickable, false otherwise 3846 * 3847 * @see #isClickable() 3848 * @attr ref android.R.styleable#View_clickable 3849 */ 3850 public void setClickable(boolean clickable) { 3851 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3852 } 3853 3854 /** 3855 * Indicates whether this view reacts to long click events or not. 3856 * 3857 * @return true if the view is long clickable, false otherwise 3858 * 3859 * @see #setLongClickable(boolean) 3860 * @attr ref android.R.styleable#View_longClickable 3861 */ 3862 public boolean isLongClickable() { 3863 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 3864 } 3865 3866 /** 3867 * Enables or disables long click events for this view. When a view is long 3868 * clickable it reacts to the user holding down the button for a longer 3869 * duration than a tap. This event can either launch the listener or a 3870 * context menu. 3871 * 3872 * @param longClickable true to make the view long clickable, false otherwise 3873 * @see #isLongClickable() 3874 * @attr ref android.R.styleable#View_longClickable 3875 */ 3876 public void setLongClickable(boolean longClickable) { 3877 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 3878 } 3879 3880 /** 3881 * Sets the pressed state for this view. 3882 * 3883 * @see #isClickable() 3884 * @see #setClickable(boolean) 3885 * 3886 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 3887 * the View's internal state from a previously set "pressed" state. 3888 */ 3889 public void setPressed(boolean pressed) { 3890 if (pressed) { 3891 mPrivateFlags |= PRESSED; 3892 } else { 3893 mPrivateFlags &= ~PRESSED; 3894 } 3895 refreshDrawableState(); 3896 dispatchSetPressed(pressed); 3897 } 3898 3899 /** 3900 * Dispatch setPressed to all of this View's children. 3901 * 3902 * @see #setPressed(boolean) 3903 * 3904 * @param pressed The new pressed state 3905 */ 3906 protected void dispatchSetPressed(boolean pressed) { 3907 } 3908 3909 /** 3910 * Indicates whether the view is currently in pressed state. Unless 3911 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 3912 * the pressed state. 3913 * 3914 * @see #setPressed 3915 * @see #isClickable() 3916 * @see #setClickable(boolean) 3917 * 3918 * @return true if the view is currently pressed, false otherwise 3919 */ 3920 public boolean isPressed() { 3921 return (mPrivateFlags & PRESSED) == PRESSED; 3922 } 3923 3924 /** 3925 * Indicates whether this view will save its state (that is, 3926 * whether its {@link #onSaveInstanceState} method will be called). 3927 * 3928 * @return Returns true if the view state saving is enabled, else false. 3929 * 3930 * @see #setSaveEnabled(boolean) 3931 * @attr ref android.R.styleable#View_saveEnabled 3932 */ 3933 public boolean isSaveEnabled() { 3934 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 3935 } 3936 3937 /** 3938 * Controls whether the saving of this view's state is 3939 * enabled (that is, whether its {@link #onSaveInstanceState} method 3940 * will be called). Note that even if freezing is enabled, the 3941 * view still must have an id assigned to it (via {@link #setId setId()}) 3942 * for its state to be saved. This flag can only disable the 3943 * saving of this view; any child views may still have their state saved. 3944 * 3945 * @param enabled Set to false to <em>disable</em> state saving, or true 3946 * (the default) to allow it. 3947 * 3948 * @see #isSaveEnabled() 3949 * @see #setId(int) 3950 * @see #onSaveInstanceState() 3951 * @attr ref android.R.styleable#View_saveEnabled 3952 */ 3953 public void setSaveEnabled(boolean enabled) { 3954 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 3955 } 3956 3957 /** 3958 * Gets whether the framework should discard touches when the view's 3959 * window is obscured by another visible window. 3960 * Refer to the {@link View} security documentation for more details. 3961 * 3962 * @return True if touch filtering is enabled. 3963 * 3964 * @see #setFilterTouchesWhenObscured(boolean) 3965 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3966 */ 3967 @ViewDebug.ExportedProperty 3968 public boolean getFilterTouchesWhenObscured() { 3969 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 3970 } 3971 3972 /** 3973 * Sets whether the framework should discard touches when the view's 3974 * window is obscured by another visible window. 3975 * Refer to the {@link View} security documentation for more details. 3976 * 3977 * @param enabled True if touch filtering should be enabled. 3978 * 3979 * @see #getFilterTouchesWhenObscured 3980 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3981 */ 3982 public void setFilterTouchesWhenObscured(boolean enabled) { 3983 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 3984 FILTER_TOUCHES_WHEN_OBSCURED); 3985 } 3986 3987 /** 3988 * Indicates whether the entire hierarchy under this view will save its 3989 * state when a state saving traversal occurs from its parent. The default 3990 * is true; if false, these views will not be saved unless 3991 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 3992 * 3993 * @return Returns true if the view state saving from parent is enabled, else false. 3994 * 3995 * @see #setSaveFromParentEnabled(boolean) 3996 */ 3997 public boolean isSaveFromParentEnabled() { 3998 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 3999 } 4000 4001 /** 4002 * Controls whether the entire hierarchy under this view will save its 4003 * state when a state saving traversal occurs from its parent. The default 4004 * is true; if false, these views will not be saved unless 4005 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4006 * 4007 * @param enabled Set to false to <em>disable</em> state saving, or true 4008 * (the default) to allow it. 4009 * 4010 * @see #isSaveFromParentEnabled() 4011 * @see #setId(int) 4012 * @see #onSaveInstanceState() 4013 */ 4014 public void setSaveFromParentEnabled(boolean enabled) { 4015 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4016 } 4017 4018 4019 /** 4020 * Returns whether this View is able to take focus. 4021 * 4022 * @return True if this view can take focus, or false otherwise. 4023 * @attr ref android.R.styleable#View_focusable 4024 */ 4025 @ViewDebug.ExportedProperty(category = "focus") 4026 public final boolean isFocusable() { 4027 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4028 } 4029 4030 /** 4031 * When a view is focusable, it may not want to take focus when in touch mode. 4032 * For example, a button would like focus when the user is navigating via a D-pad 4033 * so that the user can click on it, but once the user starts touching the screen, 4034 * the button shouldn't take focus 4035 * @return Whether the view is focusable in touch mode. 4036 * @attr ref android.R.styleable#View_focusableInTouchMode 4037 */ 4038 @ViewDebug.ExportedProperty 4039 public final boolean isFocusableInTouchMode() { 4040 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4041 } 4042 4043 /** 4044 * Find the nearest view in the specified direction that can take focus. 4045 * This does not actually give focus to that view. 4046 * 4047 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4048 * 4049 * @return The nearest focusable in the specified direction, or null if none 4050 * can be found. 4051 */ 4052 public View focusSearch(int direction) { 4053 if (mParent != null) { 4054 return mParent.focusSearch(this, direction); 4055 } else { 4056 return null; 4057 } 4058 } 4059 4060 /** 4061 * This method is the last chance for the focused view and its ancestors to 4062 * respond to an arrow key. This is called when the focused view did not 4063 * consume the key internally, nor could the view system find a new view in 4064 * the requested direction to give focus to. 4065 * 4066 * @param focused The currently focused view. 4067 * @param direction The direction focus wants to move. One of FOCUS_UP, 4068 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4069 * @return True if the this view consumed this unhandled move. 4070 */ 4071 public boolean dispatchUnhandledMove(View focused, int direction) { 4072 return false; 4073 } 4074 4075 /** 4076 * If a user manually specified the next view id for a particular direction, 4077 * use the root to look up the view. 4078 * @param root The root view of the hierarchy containing this view. 4079 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4080 * or FOCUS_BACKWARD. 4081 * @return The user specified next view, or null if there is none. 4082 */ 4083 View findUserSetNextFocus(View root, int direction) { 4084 switch (direction) { 4085 case FOCUS_LEFT: 4086 if (mNextFocusLeftId == View.NO_ID) return null; 4087 return findViewShouldExist(root, mNextFocusLeftId); 4088 case FOCUS_RIGHT: 4089 if (mNextFocusRightId == View.NO_ID) return null; 4090 return findViewShouldExist(root, mNextFocusRightId); 4091 case FOCUS_UP: 4092 if (mNextFocusUpId == View.NO_ID) return null; 4093 return findViewShouldExist(root, mNextFocusUpId); 4094 case FOCUS_DOWN: 4095 if (mNextFocusDownId == View.NO_ID) return null; 4096 return findViewShouldExist(root, mNextFocusDownId); 4097 case FOCUS_FORWARD: 4098 if (mNextFocusForwardId == View.NO_ID) return null; 4099 return findViewShouldExist(root, mNextFocusForwardId); 4100 case FOCUS_BACKWARD: { 4101 final int id = mID; 4102 return root.findViewByPredicate(new Predicate<View>() { 4103 @Override 4104 public boolean apply(View t) { 4105 return t.mNextFocusForwardId == id; 4106 } 4107 }); 4108 } 4109 } 4110 return null; 4111 } 4112 4113 private static View findViewShouldExist(View root, int childViewId) { 4114 View result = root.findViewById(childViewId); 4115 if (result == null) { 4116 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4117 + "by user for id " + childViewId); 4118 } 4119 return result; 4120 } 4121 4122 /** 4123 * Find and return all focusable views that are descendants of this view, 4124 * possibly including this view if it is focusable itself. 4125 * 4126 * @param direction The direction of the focus 4127 * @return A list of focusable views 4128 */ 4129 public ArrayList<View> getFocusables(int direction) { 4130 ArrayList<View> result = new ArrayList<View>(24); 4131 addFocusables(result, direction); 4132 return result; 4133 } 4134 4135 /** 4136 * Add any focusable views that are descendants of this view (possibly 4137 * including this view if it is focusable itself) to views. If we are in touch mode, 4138 * only add views that are also focusable in touch mode. 4139 * 4140 * @param views Focusable views found so far 4141 * @param direction The direction of the focus 4142 */ 4143 public void addFocusables(ArrayList<View> views, int direction) { 4144 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4145 } 4146 4147 /** 4148 * Adds any focusable views that are descendants of this view (possibly 4149 * including this view if it is focusable itself) to views. This method 4150 * adds all focusable views regardless if we are in touch mode or 4151 * only views focusable in touch mode if we are in touch mode depending on 4152 * the focusable mode paramater. 4153 * 4154 * @param views Focusable views found so far or null if all we are interested is 4155 * the number of focusables. 4156 * @param direction The direction of the focus. 4157 * @param focusableMode The type of focusables to be added. 4158 * 4159 * @see #FOCUSABLES_ALL 4160 * @see #FOCUSABLES_TOUCH_MODE 4161 */ 4162 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4163 if (!isFocusable()) { 4164 return; 4165 } 4166 4167 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4168 isInTouchMode() && !isFocusableInTouchMode()) { 4169 return; 4170 } 4171 4172 if (views != null) { 4173 views.add(this); 4174 } 4175 } 4176 4177 /** 4178 * Find and return all touchable views that are descendants of this view, 4179 * possibly including this view if it is touchable itself. 4180 * 4181 * @return A list of touchable views 4182 */ 4183 public ArrayList<View> getTouchables() { 4184 ArrayList<View> result = new ArrayList<View>(); 4185 addTouchables(result); 4186 return result; 4187 } 4188 4189 /** 4190 * Add any touchable views that are descendants of this view (possibly 4191 * including this view if it is touchable itself) to views. 4192 * 4193 * @param views Touchable views found so far 4194 */ 4195 public void addTouchables(ArrayList<View> views) { 4196 final int viewFlags = mViewFlags; 4197 4198 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4199 && (viewFlags & ENABLED_MASK) == ENABLED) { 4200 views.add(this); 4201 } 4202 } 4203 4204 /** 4205 * Call this to try to give focus to a specific view or to one of its 4206 * descendants. 4207 * 4208 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4209 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4210 * while the device is in touch mode. 4211 * 4212 * See also {@link #focusSearch}, which is what you call to say that you 4213 * have focus, and you want your parent to look for the next one. 4214 * 4215 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4216 * {@link #FOCUS_DOWN} and <code>null</code>. 4217 * 4218 * @return Whether this view or one of its descendants actually took focus. 4219 */ 4220 public final boolean requestFocus() { 4221 return requestFocus(View.FOCUS_DOWN); 4222 } 4223 4224 4225 /** 4226 * Call this to try to give focus to a specific view or to one of its 4227 * descendants and give it a hint about what direction focus is heading. 4228 * 4229 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4230 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4231 * while the device is in touch mode. 4232 * 4233 * See also {@link #focusSearch}, which is what you call to say that you 4234 * have focus, and you want your parent to look for the next one. 4235 * 4236 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4237 * <code>null</code> set for the previously focused rectangle. 4238 * 4239 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4240 * @return Whether this view or one of its descendants actually took focus. 4241 */ 4242 public final boolean requestFocus(int direction) { 4243 return requestFocus(direction, null); 4244 } 4245 4246 /** 4247 * Call this to try to give focus to a specific view or to one of its descendants 4248 * and give it hints about the direction and a specific rectangle that the focus 4249 * is coming from. The rectangle can help give larger views a finer grained hint 4250 * about where focus is coming from, and therefore, where to show selection, or 4251 * forward focus change internally. 4252 * 4253 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4254 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4255 * while the device is in touch mode. 4256 * 4257 * A View will not take focus if it is not visible. 4258 * 4259 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 4260 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4261 * 4262 * See also {@link #focusSearch}, which is what you call to say that you 4263 * have focus, and you want your parent to look for the next one. 4264 * 4265 * You may wish to override this method if your custom {@link View} has an internal 4266 * {@link View} that it wishes to forward the request to. 4267 * 4268 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4269 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4270 * to give a finer grained hint about where focus is coming from. May be null 4271 * if there is no hint. 4272 * @return Whether this view or one of its descendants actually took focus. 4273 */ 4274 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4275 // need to be focusable 4276 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4277 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4278 return false; 4279 } 4280 4281 // need to be focusable in touch mode if in touch mode 4282 if (isInTouchMode() && 4283 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4284 return false; 4285 } 4286 4287 // need to not have any parents blocking us 4288 if (hasAncestorThatBlocksDescendantFocus()) { 4289 return false; 4290 } 4291 4292 handleFocusGainInternal(direction, previouslyFocusedRect); 4293 return true; 4294 } 4295 4296 /** Gets the ViewRoot, or null if not attached. */ 4297 /*package*/ ViewRoot getViewRoot() { 4298 View root = getRootView(); 4299 return root != null ? (ViewRoot)root.getParent() : null; 4300 } 4301 4302 /** 4303 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4304 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4305 * touch mode to request focus when they are touched. 4306 * 4307 * @return Whether this view or one of its descendants actually took focus. 4308 * 4309 * @see #isInTouchMode() 4310 * 4311 */ 4312 public final boolean requestFocusFromTouch() { 4313 // Leave touch mode if we need to 4314 if (isInTouchMode()) { 4315 ViewRoot viewRoot = getViewRoot(); 4316 if (viewRoot != null) { 4317 viewRoot.ensureTouchMode(false); 4318 } 4319 } 4320 return requestFocus(View.FOCUS_DOWN); 4321 } 4322 4323 /** 4324 * @return Whether any ancestor of this view blocks descendant focus. 4325 */ 4326 private boolean hasAncestorThatBlocksDescendantFocus() { 4327 ViewParent ancestor = mParent; 4328 while (ancestor instanceof ViewGroup) { 4329 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4330 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4331 return true; 4332 } else { 4333 ancestor = vgAncestor.getParent(); 4334 } 4335 } 4336 return false; 4337 } 4338 4339 /** 4340 * @hide 4341 */ 4342 public void dispatchStartTemporaryDetach() { 4343 onStartTemporaryDetach(); 4344 } 4345 4346 /** 4347 * This is called when a container is going to temporarily detach a child, with 4348 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4349 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4350 * {@link #onDetachedFromWindow()} when the container is done. 4351 */ 4352 public void onStartTemporaryDetach() { 4353 removeUnsetPressCallback(); 4354 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4355 } 4356 4357 /** 4358 * @hide 4359 */ 4360 public void dispatchFinishTemporaryDetach() { 4361 onFinishTemporaryDetach(); 4362 } 4363 4364 /** 4365 * Called after {@link #onStartTemporaryDetach} when the container is done 4366 * changing the view. 4367 */ 4368 public void onFinishTemporaryDetach() { 4369 } 4370 4371 /** 4372 * capture information of this view for later analysis: developement only 4373 * check dynamic switch to make sure we only dump view 4374 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4375 */ 4376 private static void captureViewInfo(String subTag, View v) { 4377 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4378 return; 4379 } 4380 ViewDebug.dumpCapturedView(subTag, v); 4381 } 4382 4383 /** 4384 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4385 * for this view's window. Returns null if the view is not currently attached 4386 * to the window. Normally you will not need to use this directly, but 4387 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4388 */ 4389 public KeyEvent.DispatcherState getKeyDispatcherState() { 4390 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4391 } 4392 4393 /** 4394 * Dispatch a key event before it is processed by any input method 4395 * associated with the view hierarchy. This can be used to intercept 4396 * key events in special situations before the IME consumes them; a 4397 * typical example would be handling the BACK key to update the application's 4398 * UI instead of allowing the IME to see it and close itself. 4399 * 4400 * @param event The key event to be dispatched. 4401 * @return True if the event was handled, false otherwise. 4402 */ 4403 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4404 return onKeyPreIme(event.getKeyCode(), event); 4405 } 4406 4407 /** 4408 * Dispatch a key event to the next view on the focus path. This path runs 4409 * from the top of the view tree down to the currently focused view. If this 4410 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4411 * the next node down the focus path. This method also fires any key 4412 * listeners. 4413 * 4414 * @param event The key event to be dispatched. 4415 * @return True if the event was handled, false otherwise. 4416 */ 4417 public boolean dispatchKeyEvent(KeyEvent event) { 4418 // If any attached key listener a first crack at the event. 4419 4420 //noinspection SimplifiableIfStatement,deprecation 4421 if (android.util.Config.LOGV) { 4422 captureViewInfo("captureViewKeyEvent", this); 4423 } 4424 4425 //noinspection SimplifiableIfStatement 4426 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4427 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4428 return true; 4429 } 4430 4431 return event.dispatch(this, mAttachInfo != null 4432 ? mAttachInfo.mKeyDispatchState : null, this); 4433 } 4434 4435 /** 4436 * Dispatches a key shortcut event. 4437 * 4438 * @param event The key event to be dispatched. 4439 * @return True if the event was handled by the view, false otherwise. 4440 */ 4441 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4442 return onKeyShortcut(event.getKeyCode(), event); 4443 } 4444 4445 /** 4446 * Pass the touch screen motion event down to the target view, or this 4447 * view if it is the target. 4448 * 4449 * @param event The motion event to be dispatched. 4450 * @return True if the event was handled by the view, false otherwise. 4451 */ 4452 public boolean dispatchTouchEvent(MotionEvent event) { 4453 if (!onFilterTouchEventForSecurity(event)) { 4454 return false; 4455 } 4456 4457 //noinspection SimplifiableIfStatement 4458 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4459 mOnTouchListener.onTouch(this, event)) { 4460 return true; 4461 } 4462 return onTouchEvent(event); 4463 } 4464 4465 /** 4466 * Filter the touch event to apply security policies. 4467 * 4468 * @param event The motion event to be filtered. 4469 * @return True if the event should be dispatched, false if the event should be dropped. 4470 * 4471 * @see #getFilterTouchesWhenObscured 4472 */ 4473 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4474 //noinspection RedundantIfStatement 4475 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4476 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4477 // Window is obscured, drop this touch. 4478 return false; 4479 } 4480 return true; 4481 } 4482 4483 /** 4484 * Pass a trackball motion event down to the focused view. 4485 * 4486 * @param event The motion event to be dispatched. 4487 * @return True if the event was handled by the view, false otherwise. 4488 */ 4489 public boolean dispatchTrackballEvent(MotionEvent event) { 4490 //Log.i("view", "view=" + this + ", " + event.toString()); 4491 return onTrackballEvent(event); 4492 } 4493 4494 /** 4495 * Called when the window containing this view gains or loses window focus. 4496 * ViewGroups should override to route to their children. 4497 * 4498 * @param hasFocus True if the window containing this view now has focus, 4499 * false otherwise. 4500 */ 4501 public void dispatchWindowFocusChanged(boolean hasFocus) { 4502 onWindowFocusChanged(hasFocus); 4503 } 4504 4505 /** 4506 * Called when the window containing this view gains or loses focus. Note 4507 * that this is separate from view focus: to receive key events, both 4508 * your view and its window must have focus. If a window is displayed 4509 * on top of yours that takes input focus, then your own window will lose 4510 * focus but the view focus will remain unchanged. 4511 * 4512 * @param hasWindowFocus True if the window containing this view now has 4513 * focus, false otherwise. 4514 */ 4515 public void onWindowFocusChanged(boolean hasWindowFocus) { 4516 InputMethodManager imm = InputMethodManager.peekInstance(); 4517 if (!hasWindowFocus) { 4518 if (isPressed()) { 4519 setPressed(false); 4520 } 4521 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4522 imm.focusOut(this); 4523 } 4524 removeLongPressCallback(); 4525 removeTapCallback(); 4526 onFocusLost(); 4527 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4528 imm.focusIn(this); 4529 } 4530 refreshDrawableState(); 4531 } 4532 4533 /** 4534 * Returns true if this view is in a window that currently has window focus. 4535 * Note that this is not the same as the view itself having focus. 4536 * 4537 * @return True if this view is in a window that currently has window focus. 4538 */ 4539 public boolean hasWindowFocus() { 4540 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4541 } 4542 4543 /** 4544 * Dispatch a view visibility change down the view hierarchy. 4545 * ViewGroups should override to route to their children. 4546 * @param changedView The view whose visibility changed. Could be 'this' or 4547 * an ancestor view. 4548 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4549 * {@link #INVISIBLE} or {@link #GONE}. 4550 */ 4551 protected void dispatchVisibilityChanged(View changedView, int visibility) { 4552 onVisibilityChanged(changedView, visibility); 4553 } 4554 4555 /** 4556 * Called when the visibility of the view or an ancestor of the view is changed. 4557 * @param changedView The view whose visibility changed. Could be 'this' or 4558 * an ancestor view. 4559 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4560 * {@link #INVISIBLE} or {@link #GONE}. 4561 */ 4562 protected void onVisibilityChanged(View changedView, int visibility) { 4563 if (visibility == VISIBLE) { 4564 if (mAttachInfo != null) { 4565 initialAwakenScrollBars(); 4566 } else { 4567 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4568 } 4569 } 4570 } 4571 4572 /** 4573 * Dispatch a hint about whether this view is displayed. For instance, when 4574 * a View moves out of the screen, it might receives a display hint indicating 4575 * the view is not displayed. Applications should not <em>rely</em> on this hint 4576 * as there is no guarantee that they will receive one. 4577 * 4578 * @param hint A hint about whether or not this view is displayed: 4579 * {@link #VISIBLE} or {@link #INVISIBLE}. 4580 */ 4581 public void dispatchDisplayHint(int hint) { 4582 onDisplayHint(hint); 4583 } 4584 4585 /** 4586 * Gives this view a hint about whether is displayed or not. For instance, when 4587 * a View moves out of the screen, it might receives a display hint indicating 4588 * the view is not displayed. Applications should not <em>rely</em> on this hint 4589 * as there is no guarantee that they will receive one. 4590 * 4591 * @param hint A hint about whether or not this view is displayed: 4592 * {@link #VISIBLE} or {@link #INVISIBLE}. 4593 */ 4594 protected void onDisplayHint(int hint) { 4595 } 4596 4597 /** 4598 * Dispatch a window visibility change down the view hierarchy. 4599 * ViewGroups should override to route to their children. 4600 * 4601 * @param visibility The new visibility of the window. 4602 * 4603 * @see #onWindowVisibilityChanged 4604 */ 4605 public void dispatchWindowVisibilityChanged(int visibility) { 4606 onWindowVisibilityChanged(visibility); 4607 } 4608 4609 /** 4610 * Called when the window containing has change its visibility 4611 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4612 * that this tells you whether or not your window is being made visible 4613 * to the window manager; this does <em>not</em> tell you whether or not 4614 * your window is obscured by other windows on the screen, even if it 4615 * is itself visible. 4616 * 4617 * @param visibility The new visibility of the window. 4618 */ 4619 protected void onWindowVisibilityChanged(int visibility) { 4620 if (visibility == VISIBLE) { 4621 initialAwakenScrollBars(); 4622 } 4623 } 4624 4625 /** 4626 * Returns the current visibility of the window this view is attached to 4627 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4628 * 4629 * @return Returns the current visibility of the view's window. 4630 */ 4631 public int getWindowVisibility() { 4632 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4633 } 4634 4635 /** 4636 * Retrieve the overall visible display size in which the window this view is 4637 * attached to has been positioned in. This takes into account screen 4638 * decorations above the window, for both cases where the window itself 4639 * is being position inside of them or the window is being placed under 4640 * then and covered insets are used for the window to position its content 4641 * inside. In effect, this tells you the available area where content can 4642 * be placed and remain visible to users. 4643 * 4644 * <p>This function requires an IPC back to the window manager to retrieve 4645 * the requested information, so should not be used in performance critical 4646 * code like drawing. 4647 * 4648 * @param outRect Filled in with the visible display frame. If the view 4649 * is not attached to a window, this is simply the raw display size. 4650 */ 4651 public void getWindowVisibleDisplayFrame(Rect outRect) { 4652 if (mAttachInfo != null) { 4653 try { 4654 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4655 } catch (RemoteException e) { 4656 return; 4657 } 4658 // XXX This is really broken, and probably all needs to be done 4659 // in the window manager, and we need to know more about whether 4660 // we want the area behind or in front of the IME. 4661 final Rect insets = mAttachInfo.mVisibleInsets; 4662 outRect.left += insets.left; 4663 outRect.top += insets.top; 4664 outRect.right -= insets.right; 4665 outRect.bottom -= insets.bottom; 4666 return; 4667 } 4668 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4669 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4670 } 4671 4672 /** 4673 * Dispatch a notification about a resource configuration change down 4674 * the view hierarchy. 4675 * ViewGroups should override to route to their children. 4676 * 4677 * @param newConfig The new resource configuration. 4678 * 4679 * @see #onConfigurationChanged 4680 */ 4681 public void dispatchConfigurationChanged(Configuration newConfig) { 4682 onConfigurationChanged(newConfig); 4683 } 4684 4685 /** 4686 * Called when the current configuration of the resources being used 4687 * by the application have changed. You can use this to decide when 4688 * to reload resources that can changed based on orientation and other 4689 * configuration characterstics. You only need to use this if you are 4690 * not relying on the normal {@link android.app.Activity} mechanism of 4691 * recreating the activity instance upon a configuration change. 4692 * 4693 * @param newConfig The new resource configuration. 4694 */ 4695 protected void onConfigurationChanged(Configuration newConfig) { 4696 } 4697 4698 /** 4699 * Private function to aggregate all per-view attributes in to the view 4700 * root. 4701 */ 4702 void dispatchCollectViewAttributes(int visibility) { 4703 performCollectViewAttributes(visibility); 4704 } 4705 4706 void performCollectViewAttributes(int visibility) { 4707 //noinspection PointlessBitwiseExpression 4708 if (((visibility | mViewFlags) & (VISIBILITY_MASK | KEEP_SCREEN_ON)) 4709 == (VISIBLE | KEEP_SCREEN_ON)) { 4710 mAttachInfo.mKeepScreenOn = true; 4711 } 4712 } 4713 4714 void needGlobalAttributesUpdate(boolean force) { 4715 AttachInfo ai = mAttachInfo; 4716 if (ai != null) { 4717 if (ai.mKeepScreenOn || force) { 4718 ai.mRecomputeGlobalAttributes = true; 4719 } 4720 } 4721 } 4722 4723 /** 4724 * Returns whether the device is currently in touch mode. Touch mode is entered 4725 * once the user begins interacting with the device by touch, and affects various 4726 * things like whether focus is always visible to the user. 4727 * 4728 * @return Whether the device is in touch mode. 4729 */ 4730 @ViewDebug.ExportedProperty 4731 public boolean isInTouchMode() { 4732 if (mAttachInfo != null) { 4733 return mAttachInfo.mInTouchMode; 4734 } else { 4735 return ViewRoot.isInTouchMode(); 4736 } 4737 } 4738 4739 /** 4740 * Returns the context the view is running in, through which it can 4741 * access the current theme, resources, etc. 4742 * 4743 * @return The view's Context. 4744 */ 4745 @ViewDebug.CapturedViewProperty 4746 public final Context getContext() { 4747 return mContext; 4748 } 4749 4750 /** 4751 * Handle a key event before it is processed by any input method 4752 * associated with the view hierarchy. This can be used to intercept 4753 * key events in special situations before the IME consumes them; a 4754 * typical example would be handling the BACK key to update the application's 4755 * UI instead of allowing the IME to see it and close itself. 4756 * 4757 * @param keyCode The value in event.getKeyCode(). 4758 * @param event Description of the key event. 4759 * @return If you handled the event, return true. If you want to allow the 4760 * event to be handled by the next receiver, return false. 4761 */ 4762 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4763 return false; 4764 } 4765 4766 /** 4767 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 4768 * KeyEvent.Callback.onKeyDown()}: perform press of the view 4769 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4770 * is released, if the view is enabled and clickable. 4771 * 4772 * @param keyCode A key code that represents the button pressed, from 4773 * {@link android.view.KeyEvent}. 4774 * @param event The KeyEvent object that defines the button action. 4775 */ 4776 public boolean onKeyDown(int keyCode, KeyEvent event) { 4777 boolean result = false; 4778 4779 switch (keyCode) { 4780 case KeyEvent.KEYCODE_DPAD_CENTER: 4781 case KeyEvent.KEYCODE_ENTER: { 4782 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4783 return true; 4784 } 4785 // Long clickable items don't necessarily have to be clickable 4786 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4787 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4788 (event.getRepeatCount() == 0)) { 4789 setPressed(true); 4790 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4791 postCheckForLongClick(0); 4792 } 4793 return true; 4794 } 4795 break; 4796 } 4797 } 4798 return result; 4799 } 4800 4801 /** 4802 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4803 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4804 * the event). 4805 */ 4806 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 4807 return false; 4808 } 4809 4810 /** 4811 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 4812 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 4813 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 4814 * {@link KeyEvent#KEYCODE_ENTER} is released. 4815 * 4816 * @param keyCode A key code that represents the button pressed, from 4817 * {@link android.view.KeyEvent}. 4818 * @param event The KeyEvent object that defines the button action. 4819 */ 4820 public boolean onKeyUp(int keyCode, KeyEvent event) { 4821 boolean result = false; 4822 4823 switch (keyCode) { 4824 case KeyEvent.KEYCODE_DPAD_CENTER: 4825 case KeyEvent.KEYCODE_ENTER: { 4826 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4827 return true; 4828 } 4829 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 4830 setPressed(false); 4831 4832 if (!mHasPerformedLongPress) { 4833 // This is a tap, so remove the longpress check 4834 removeLongPressCallback(); 4835 4836 result = performClick(); 4837 } 4838 } 4839 break; 4840 } 4841 } 4842 return result; 4843 } 4844 4845 /** 4846 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4847 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 4848 * the event). 4849 * 4850 * @param keyCode A key code that represents the button pressed, from 4851 * {@link android.view.KeyEvent}. 4852 * @param repeatCount The number of times the action was made. 4853 * @param event The KeyEvent object that defines the button action. 4854 */ 4855 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 4856 return false; 4857 } 4858 4859 /** 4860 * Called on the focused view when a key shortcut event is not handled. 4861 * Override this method to implement local key shortcuts for the View. 4862 * Key shortcuts can also be implemented by setting the 4863 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 4864 * 4865 * @param keyCode The value in event.getKeyCode(). 4866 * @param event Description of the key event. 4867 * @return If you handled the event, return true. If you want to allow the 4868 * event to be handled by the next receiver, return false. 4869 */ 4870 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 4871 return false; 4872 } 4873 4874 /** 4875 * Check whether the called view is a text editor, in which case it 4876 * would make sense to automatically display a soft input window for 4877 * it. Subclasses should override this if they implement 4878 * {@link #onCreateInputConnection(EditorInfo)} to return true if 4879 * a call on that method would return a non-null InputConnection, and 4880 * they are really a first-class editor that the user would normally 4881 * start typing on when the go into a window containing your view. 4882 * 4883 * <p>The default implementation always returns false. This does 4884 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 4885 * will not be called or the user can not otherwise perform edits on your 4886 * view; it is just a hint to the system that this is not the primary 4887 * purpose of this view. 4888 * 4889 * @return Returns true if this view is a text editor, else false. 4890 */ 4891 public boolean onCheckIsTextEditor() { 4892 return false; 4893 } 4894 4895 /** 4896 * Create a new InputConnection for an InputMethod to interact 4897 * with the view. The default implementation returns null, since it doesn't 4898 * support input methods. You can override this to implement such support. 4899 * This is only needed for views that take focus and text input. 4900 * 4901 * <p>When implementing this, you probably also want to implement 4902 * {@link #onCheckIsTextEditor()} to indicate you will return a 4903 * non-null InputConnection. 4904 * 4905 * @param outAttrs Fill in with attribute information about the connection. 4906 */ 4907 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 4908 return null; 4909 } 4910 4911 /** 4912 * Called by the {@link android.view.inputmethod.InputMethodManager} 4913 * when a view who is not the current 4914 * input connection target is trying to make a call on the manager. The 4915 * default implementation returns false; you can override this to return 4916 * true for certain views if you are performing InputConnection proxying 4917 * to them. 4918 * @param view The View that is making the InputMethodManager call. 4919 * @return Return true to allow the call, false to reject. 4920 */ 4921 public boolean checkInputConnectionProxy(View view) { 4922 return false; 4923 } 4924 4925 /** 4926 * Show the context menu for this view. It is not safe to hold on to the 4927 * menu after returning from this method. 4928 * 4929 * You should normally not overload this method. Overload 4930 * {@link #onCreateContextMenu(ContextMenu)} or define an 4931 * {@link OnCreateContextMenuListener} to add items to the context menu. 4932 * 4933 * @param menu The context menu to populate 4934 */ 4935 public void createContextMenu(ContextMenu menu) { 4936 ContextMenuInfo menuInfo = getContextMenuInfo(); 4937 4938 // Sets the current menu info so all items added to menu will have 4939 // my extra info set. 4940 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 4941 4942 onCreateContextMenu(menu); 4943 if (mOnCreateContextMenuListener != null) { 4944 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 4945 } 4946 4947 // Clear the extra information so subsequent items that aren't mine don't 4948 // have my extra info. 4949 ((MenuBuilder)menu).setCurrentMenuInfo(null); 4950 4951 if (mParent != null) { 4952 mParent.createContextMenu(menu); 4953 } 4954 } 4955 4956 /** 4957 * Views should implement this if they have extra information to associate 4958 * with the context menu. The return result is supplied as a parameter to 4959 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 4960 * callback. 4961 * 4962 * @return Extra information about the item for which the context menu 4963 * should be shown. This information will vary across different 4964 * subclasses of View. 4965 */ 4966 protected ContextMenuInfo getContextMenuInfo() { 4967 return null; 4968 } 4969 4970 /** 4971 * Views should implement this if the view itself is going to add items to 4972 * the context menu. 4973 * 4974 * @param menu the context menu to populate 4975 */ 4976 protected void onCreateContextMenu(ContextMenu menu) { 4977 } 4978 4979 /** 4980 * Implement this method to handle trackball motion events. The 4981 * <em>relative</em> movement of the trackball since the last event 4982 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 4983 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 4984 * that a movement of 1 corresponds to the user pressing one DPAD key (so 4985 * they will often be fractional values, representing the more fine-grained 4986 * movement information available from a trackball). 4987 * 4988 * @param event The motion event. 4989 * @return True if the event was handled, false otherwise. 4990 */ 4991 public boolean onTrackballEvent(MotionEvent event) { 4992 return false; 4993 } 4994 4995 /** 4996 * Implement this method to handle touch screen motion events. 4997 * 4998 * @param event The motion event. 4999 * @return True if the event was handled, false otherwise. 5000 */ 5001 public boolean onTouchEvent(MotionEvent event) { 5002 final int viewFlags = mViewFlags; 5003 5004 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5005 // A disabled view that is clickable still consumes the touch 5006 // events, it just doesn't respond to them. 5007 return (((viewFlags & CLICKABLE) == CLICKABLE || 5008 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5009 } 5010 5011 if (mTouchDelegate != null) { 5012 if (mTouchDelegate.onTouchEvent(event)) { 5013 return true; 5014 } 5015 } 5016 5017 if (((viewFlags & CLICKABLE) == CLICKABLE || 5018 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5019 switch (event.getAction()) { 5020 case MotionEvent.ACTION_UP: 5021 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5022 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5023 // take focus if we don't have it already and we should in 5024 // touch mode. 5025 boolean focusTaken = false; 5026 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5027 focusTaken = requestFocus(); 5028 } 5029 5030 if (prepressed) { 5031 // The button is being released before we actually 5032 // showed it as pressed. Make it show the pressed 5033 // state now (before scheduling the click) to ensure 5034 // the user sees it. 5035 mPrivateFlags |= PRESSED; 5036 refreshDrawableState(); 5037 } 5038 5039 if (!mHasPerformedLongPress) { 5040 // This is a tap, so remove the longpress check 5041 removeLongPressCallback(); 5042 5043 // Only perform take click actions if we were in the pressed state 5044 if (!focusTaken) { 5045 // Use a Runnable and post this rather than calling 5046 // performClick directly. This lets other visual state 5047 // of the view update before click actions start. 5048 if (mPerformClick == null) { 5049 mPerformClick = new PerformClick(); 5050 } 5051 if (!post(mPerformClick)) { 5052 performClick(); 5053 } 5054 } 5055 } 5056 5057 if (mUnsetPressedState == null) { 5058 mUnsetPressedState = new UnsetPressedState(); 5059 } 5060 5061 if (prepressed) { 5062 postDelayed(mUnsetPressedState, 5063 ViewConfiguration.getPressedStateDuration()); 5064 } else if (!post(mUnsetPressedState)) { 5065 // If the post failed, unpress right now 5066 mUnsetPressedState.run(); 5067 } 5068 removeTapCallback(); 5069 } 5070 break; 5071 5072 case MotionEvent.ACTION_DOWN: 5073 if (mPendingCheckForTap == null) { 5074 mPendingCheckForTap = new CheckForTap(); 5075 } 5076 mPrivateFlags |= PREPRESSED; 5077 mHasPerformedLongPress = false; 5078 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5079 break; 5080 5081 case MotionEvent.ACTION_CANCEL: 5082 mPrivateFlags &= ~PRESSED; 5083 refreshDrawableState(); 5084 removeTapCallback(); 5085 break; 5086 5087 case MotionEvent.ACTION_MOVE: 5088 final int x = (int) event.getX(); 5089 final int y = (int) event.getY(); 5090 5091 // Be lenient about moving outside of buttons 5092 if (!pointInView(x, y, mTouchSlop)) { 5093 // Outside button 5094 removeTapCallback(); 5095 if ((mPrivateFlags & PRESSED) != 0) { 5096 // Remove any future long press/tap checks 5097 removeLongPressCallback(); 5098 5099 // Need to switch from pressed to not pressed 5100 mPrivateFlags &= ~PRESSED; 5101 refreshDrawableState(); 5102 } 5103 } 5104 break; 5105 } 5106 return true; 5107 } 5108 5109 return false; 5110 } 5111 5112 /** 5113 * Remove the longpress detection timer. 5114 */ 5115 private void removeLongPressCallback() { 5116 if (mPendingCheckForLongPress != null) { 5117 removeCallbacks(mPendingCheckForLongPress); 5118 } 5119 } 5120 5121 /** 5122 * Remove the pending click action 5123 */ 5124 private void removePerformClickCallback() { 5125 if (mPerformClick != null) { 5126 removeCallbacks(mPerformClick); 5127 } 5128 } 5129 5130 /** 5131 * Remove the prepress detection timer. 5132 */ 5133 private void removeUnsetPressCallback() { 5134 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5135 setPressed(false); 5136 removeCallbacks(mUnsetPressedState); 5137 } 5138 } 5139 5140 /** 5141 * Remove the tap detection timer. 5142 */ 5143 private void removeTapCallback() { 5144 if (mPendingCheckForTap != null) { 5145 mPrivateFlags &= ~PREPRESSED; 5146 removeCallbacks(mPendingCheckForTap); 5147 } 5148 } 5149 5150 /** 5151 * Cancels a pending long press. Your subclass can use this if you 5152 * want the context menu to come up if the user presses and holds 5153 * at the same place, but you don't want it to come up if they press 5154 * and then move around enough to cause scrolling. 5155 */ 5156 public void cancelLongPress() { 5157 removeLongPressCallback(); 5158 5159 /* 5160 * The prepressed state handled by the tap callback is a display 5161 * construct, but the tap callback will post a long press callback 5162 * less its own timeout. Remove it here. 5163 */ 5164 removeTapCallback(); 5165 } 5166 5167 /** 5168 * Sets the TouchDelegate for this View. 5169 */ 5170 public void setTouchDelegate(TouchDelegate delegate) { 5171 mTouchDelegate = delegate; 5172 } 5173 5174 /** 5175 * Gets the TouchDelegate for this View. 5176 */ 5177 public TouchDelegate getTouchDelegate() { 5178 return mTouchDelegate; 5179 } 5180 5181 /** 5182 * Set flags controlling behavior of this view. 5183 * 5184 * @param flags Constant indicating the value which should be set 5185 * @param mask Constant indicating the bit range that should be changed 5186 */ 5187 void setFlags(int flags, int mask) { 5188 int old = mViewFlags; 5189 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5190 5191 int changed = mViewFlags ^ old; 5192 if (changed == 0) { 5193 return; 5194 } 5195 int privateFlags = mPrivateFlags; 5196 5197 /* Check if the FOCUSABLE bit has changed */ 5198 if (((changed & FOCUSABLE_MASK) != 0) && 5199 ((privateFlags & HAS_BOUNDS) !=0)) { 5200 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5201 && ((privateFlags & FOCUSED) != 0)) { 5202 /* Give up focus if we are no longer focusable */ 5203 clearFocus(); 5204 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 5205 && ((privateFlags & FOCUSED) == 0)) { 5206 /* 5207 * Tell the view system that we are now available to take focus 5208 * if no one else already has it. 5209 */ 5210 if (mParent != null) mParent.focusableViewAvailable(this); 5211 } 5212 } 5213 5214 if ((flags & VISIBILITY_MASK) == VISIBLE) { 5215 if ((changed & VISIBILITY_MASK) != 0) { 5216 /* 5217 * If this view is becoming visible, set the DRAWN flag so that 5218 * the next invalidate() will not be skipped. 5219 */ 5220 mPrivateFlags |= DRAWN; 5221 5222 needGlobalAttributesUpdate(true); 5223 5224 // a view becoming visible is worth notifying the parent 5225 // about in case nothing has focus. even if this specific view 5226 // isn't focusable, it may contain something that is, so let 5227 // the root view try to give this focus if nothing else does. 5228 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 5229 mParent.focusableViewAvailable(this); 5230 } 5231 } 5232 } 5233 5234 /* Check if the GONE bit has changed */ 5235 if ((changed & GONE) != 0) { 5236 needGlobalAttributesUpdate(false); 5237 requestLayout(); 5238 invalidate(); 5239 5240 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 5241 if (hasFocus()) clearFocus(); 5242 destroyDrawingCache(); 5243 } 5244 if (mAttachInfo != null) { 5245 mAttachInfo.mViewVisibilityChanged = true; 5246 } 5247 } 5248 5249 /* Check if the VISIBLE bit has changed */ 5250 if ((changed & INVISIBLE) != 0) { 5251 needGlobalAttributesUpdate(false); 5252 invalidate(); 5253 5254 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 5255 // root view becoming invisible shouldn't clear focus 5256 if (getRootView() != this) { 5257 clearFocus(); 5258 } 5259 } 5260 if (mAttachInfo != null) { 5261 mAttachInfo.mViewVisibilityChanged = true; 5262 } 5263 } 5264 5265 if ((changed & VISIBILITY_MASK) != 0) { 5266 if (mParent instanceof ViewGroup) { 5267 ((ViewGroup)mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5268 } 5269 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5270 } 5271 5272 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 5273 destroyDrawingCache(); 5274 } 5275 5276 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 5277 destroyDrawingCache(); 5278 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5279 } 5280 5281 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 5282 destroyDrawingCache(); 5283 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5284 } 5285 5286 if ((changed & DRAW_MASK) != 0) { 5287 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 5288 if (mBGDrawable != null) { 5289 mPrivateFlags &= ~SKIP_DRAW; 5290 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 5291 } else { 5292 mPrivateFlags |= SKIP_DRAW; 5293 } 5294 } else { 5295 mPrivateFlags &= ~SKIP_DRAW; 5296 } 5297 requestLayout(); 5298 invalidate(); 5299 } 5300 5301 if ((changed & KEEP_SCREEN_ON) != 0) { 5302 if (mParent != null) { 5303 mParent.recomputeViewAttributes(this); 5304 } 5305 } 5306 } 5307 5308 /** 5309 * Change the view's z order in the tree, so it's on top of other sibling 5310 * views 5311 */ 5312 public void bringToFront() { 5313 if (mParent != null) { 5314 mParent.bringChildToFront(this); 5315 } 5316 } 5317 5318 /** 5319 * This is called in response to an internal scroll in this view (i.e., the 5320 * view scrolled its own contents). This is typically as a result of 5321 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 5322 * called. 5323 * 5324 * @param l Current horizontal scroll origin. 5325 * @param t Current vertical scroll origin. 5326 * @param oldl Previous horizontal scroll origin. 5327 * @param oldt Previous vertical scroll origin. 5328 */ 5329 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 5330 mBackgroundSizeChanged = true; 5331 5332 final AttachInfo ai = mAttachInfo; 5333 if (ai != null) { 5334 ai.mViewScrollChanged = true; 5335 } 5336 } 5337 5338 /** 5339 * Interface definition for a callback to be invoked when the layout bounds of a view 5340 * changes due to layout processing. 5341 */ 5342 public interface OnLayoutChangeListener { 5343 /** 5344 * Called when the focus state of a view has changed. 5345 * 5346 * @param v The view whose state has changed. 5347 * @param left The new value of the view's left property. 5348 * @param top The new value of the view's top property. 5349 * @param right The new value of the view's right property. 5350 * @param bottom The new value of the view's bottom property. 5351 * @param oldLeft The previous value of the view's left property. 5352 * @param oldTop The previous value of the view's top property. 5353 * @param oldRight The previous value of the view's right property. 5354 * @param oldBottom The previous value of the view's bottom property. 5355 */ 5356 void onLayoutChange(View v, int left, int top, int right, int bottom, 5357 int oldLeft, int oldTop, int oldRight, int oldBottom); 5358 } 5359 5360 /** 5361 * This is called during layout when the size of this view has changed. If 5362 * you were just added to the view hierarchy, you're called with the old 5363 * values of 0. 5364 * 5365 * @param w Current width of this view. 5366 * @param h Current height of this view. 5367 * @param oldw Old width of this view. 5368 * @param oldh Old height of this view. 5369 */ 5370 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5371 } 5372 5373 /** 5374 * Called by draw to draw the child views. This may be overridden 5375 * by derived classes to gain control just before its children are drawn 5376 * (but after its own view has been drawn). 5377 * @param canvas the canvas on which to draw the view 5378 */ 5379 protected void dispatchDraw(Canvas canvas) { 5380 } 5381 5382 /** 5383 * Gets the parent of this view. Note that the parent is a 5384 * ViewParent and not necessarily a View. 5385 * 5386 * @return Parent of this view. 5387 */ 5388 public final ViewParent getParent() { 5389 return mParent; 5390 } 5391 5392 /** 5393 * Return the scrolled left position of this view. This is the left edge of 5394 * the displayed part of your view. You do not need to draw any pixels 5395 * farther left, since those are outside of the frame of your view on 5396 * screen. 5397 * 5398 * @return The left edge of the displayed part of your view, in pixels. 5399 */ 5400 public final int getScrollX() { 5401 return mScrollX; 5402 } 5403 5404 /** 5405 * Return the scrolled top position of this view. This is the top edge of 5406 * the displayed part of your view. You do not need to draw any pixels above 5407 * it, since those are outside of the frame of your view on screen. 5408 * 5409 * @return The top edge of the displayed part of your view, in pixels. 5410 */ 5411 public final int getScrollY() { 5412 return mScrollY; 5413 } 5414 5415 /** 5416 * Return the width of the your view. 5417 * 5418 * @return The width of your view, in pixels. 5419 */ 5420 @ViewDebug.ExportedProperty(category = "layout") 5421 public final int getWidth() { 5422 return mRight - mLeft; 5423 } 5424 5425 /** 5426 * Return the height of your view. 5427 * 5428 * @return The height of your view, in pixels. 5429 */ 5430 @ViewDebug.ExportedProperty(category = "layout") 5431 public final int getHeight() { 5432 return mBottom - mTop; 5433 } 5434 5435 /** 5436 * Return the visible drawing bounds of your view. Fills in the output 5437 * rectangle with the values from getScrollX(), getScrollY(), 5438 * getWidth(), and getHeight(). 5439 * 5440 * @param outRect The (scrolled) drawing bounds of the view. 5441 */ 5442 public void getDrawingRect(Rect outRect) { 5443 outRect.left = mScrollX; 5444 outRect.top = mScrollY; 5445 outRect.right = mScrollX + (mRight - mLeft); 5446 outRect.bottom = mScrollY + (mBottom - mTop); 5447 } 5448 5449 /** 5450 * Like {@link #getMeasuredWidthAndState()}, but only returns the 5451 * raw width component (that is the result is masked by 5452 * {@link #MEASURED_SIZE_MASK}). 5453 * 5454 * @return The raw measured width of this view. 5455 */ 5456 public final int getMeasuredWidth() { 5457 return mMeasuredWidth & MEASURED_SIZE_MASK; 5458 } 5459 5460 /** 5461 * Return the full width measurement information for this view as computed 5462 * by the most recent call to {@link #measure}. This result is a bit mask 5463 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5464 * This should be used during measurement and layout calculations only. Use 5465 * {@link #getWidth()} to see how wide a view is after layout. 5466 * 5467 * @return The measured width of this view as a bit mask. 5468 */ 5469 public final int getMeasuredWidthAndState() { 5470 return mMeasuredWidth; 5471 } 5472 5473 /** 5474 * Like {@link #getMeasuredHeightAndState()}, but only returns the 5475 * raw width component (that is the result is masked by 5476 * {@link #MEASURED_SIZE_MASK}). 5477 * 5478 * @return The raw measured height of this view. 5479 */ 5480 public final int getMeasuredHeight() { 5481 return mMeasuredHeight & MEASURED_SIZE_MASK; 5482 } 5483 5484 /** 5485 * Return the full height measurement information for this view as computed 5486 * by the most recent call to {@link #measure}. This result is a bit mask 5487 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5488 * This should be used during measurement and layout calculations only. Use 5489 * {@link #getHeight()} to see how wide a view is after layout. 5490 * 5491 * @return The measured width of this view as a bit mask. 5492 */ 5493 public final int getMeasuredHeightAndState() { 5494 return mMeasuredHeight; 5495 } 5496 5497 /** 5498 * Return only the state bits of {@link #getMeasuredWidthAndState()} 5499 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 5500 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 5501 * and the height component is at the shifted bits 5502 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 5503 */ 5504 public final int getMeasuredState() { 5505 return (mMeasuredWidth&MEASURED_STATE_MASK) 5506 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 5507 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 5508 } 5509 5510 /** 5511 * The transform matrix of this view, which is calculated based on the current 5512 * roation, scale, and pivot properties. 5513 * 5514 * @see #getRotation() 5515 * @see #getScaleX() 5516 * @see #getScaleY() 5517 * @see #getPivotX() 5518 * @see #getPivotY() 5519 * @return The current transform matrix for the view 5520 */ 5521 public Matrix getMatrix() { 5522 updateMatrix(); 5523 return mMatrix; 5524 } 5525 5526 /** 5527 * Utility function to determine if the value is far enough away from zero to be 5528 * considered non-zero. 5529 * @param value A floating point value to check for zero-ness 5530 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5531 */ 5532 private static boolean nonzero(float value) { 5533 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5534 } 5535 5536 /** 5537 * Returns true if the transform matrix is the identity matrix. 5538 * Recomputes the matrix if necessary. 5539 * 5540 * @return True if the transform matrix is the identity matrix, false otherwise. 5541 */ 5542 final boolean hasIdentityMatrix() { 5543 updateMatrix(); 5544 return mMatrixIsIdentity; 5545 } 5546 5547 /** 5548 * Recomputes the transform matrix if necessary. 5549 */ 5550 private void updateMatrix() { 5551 if (mMatrixDirty) { 5552 // transform-related properties have changed since the last time someone 5553 // asked for the matrix; recalculate it with the current values 5554 5555 // Figure out if we need to update the pivot point 5556 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5557 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 5558 mPrevWidth = mRight - mLeft; 5559 mPrevHeight = mBottom - mTop; 5560 mPivotX = mPrevWidth / 2f; 5561 mPivotY = mPrevHeight / 2f; 5562 } 5563 } 5564 mMatrix.reset(); 5565 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5566 mMatrix.setTranslate(mTranslationX, mTranslationY); 5567 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5568 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5569 } else { 5570 if (mCamera == null) { 5571 mCamera = new Camera(); 5572 matrix3D = new Matrix(); 5573 } 5574 mCamera.save(); 5575 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5576 mCamera.rotateX(mRotationX); 5577 mCamera.rotateY(mRotationY); 5578 mCamera.rotateZ(-mRotation); 5579 mCamera.getMatrix(matrix3D); 5580 matrix3D.preTranslate(-mPivotX, -mPivotY); 5581 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5582 mMatrix.postConcat(matrix3D); 5583 mCamera.restore(); 5584 } 5585 mMatrixDirty = false; 5586 mMatrixIsIdentity = mMatrix.isIdentity(); 5587 mInverseMatrixDirty = true; 5588 } 5589 } 5590 5591 /** 5592 * Utility method to retrieve the inverse of the current mMatrix property. 5593 * We cache the matrix to avoid recalculating it when transform properties 5594 * have not changed. 5595 * 5596 * @return The inverse of the current matrix of this view. 5597 */ 5598 final Matrix getInverseMatrix() { 5599 updateMatrix(); 5600 if (mInverseMatrixDirty) { 5601 if (mInverseMatrix == null) { 5602 mInverseMatrix = new Matrix(); 5603 } 5604 mMatrix.invert(mInverseMatrix); 5605 mInverseMatrixDirty = false; 5606 } 5607 return mInverseMatrix; 5608 } 5609 5610 /** 5611 * The degrees that the view is rotated around the pivot point. 5612 * 5613 * @see #getPivotX() 5614 * @see #getPivotY() 5615 * @return The degrees of rotation. 5616 */ 5617 public float getRotation() { 5618 return mRotation; 5619 } 5620 5621 /** 5622 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5623 * result in clockwise rotation. 5624 * 5625 * @param rotation The degrees of rotation. 5626 * @see #getPivotX() 5627 * @see #getPivotY() 5628 * 5629 * @attr ref android.R.styleable#View_rotation 5630 */ 5631 public void setRotation(float rotation) { 5632 if (mRotation != rotation) { 5633 // Double-invalidation is necessary to capture view's old and new areas 5634 invalidate(false); 5635 mRotation = rotation; 5636 mMatrixDirty = true; 5637 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5638 invalidate(false); 5639 } 5640 } 5641 5642 /** 5643 * The degrees that the view is rotated around the vertical axis through the pivot point. 5644 * 5645 * @see #getPivotX() 5646 * @see #getPivotY() 5647 * @return The degrees of Y rotation. 5648 */ 5649 public float getRotationY() { 5650 return mRotationY; 5651 } 5652 5653 /** 5654 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5655 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5656 * down the y axis. 5657 * 5658 * @param rotationY The degrees of Y rotation. 5659 * @see #getPivotX() 5660 * @see #getPivotY() 5661 * 5662 * @attr ref android.R.styleable#View_rotationY 5663 */ 5664 public void setRotationY(float rotationY) { 5665 if (mRotationY != rotationY) { 5666 // Double-invalidation is necessary to capture view's old and new areas 5667 invalidate(false); 5668 mRotationY = rotationY; 5669 mMatrixDirty = true; 5670 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5671 invalidate(false); 5672 } 5673 } 5674 5675 /** 5676 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5677 * 5678 * @see #getPivotX() 5679 * @see #getPivotY() 5680 * @return The degrees of X rotation. 5681 */ 5682 public float getRotationX() { 5683 return mRotationX; 5684 } 5685 5686 /** 5687 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 5688 * Increasing values result in clockwise rotation from the viewpoint of looking down the 5689 * x axis. 5690 * 5691 * @param rotationX The degrees of X rotation. 5692 * @see #getPivotX() 5693 * @see #getPivotY() 5694 * 5695 * @attr ref android.R.styleable#View_rotationX 5696 */ 5697 public void setRotationX(float rotationX) { 5698 if (mRotationX != rotationX) { 5699 // Double-invalidation is necessary to capture view's old and new areas 5700 invalidate(false); 5701 mRotationX = rotationX; 5702 mMatrixDirty = true; 5703 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5704 invalidate(false); 5705 } 5706 } 5707 5708 /** 5709 * The amount that the view is scaled in x around the pivot point, as a proportion of 5710 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 5711 * 5712 * <p>By default, this is 1.0f. 5713 * 5714 * @see #getPivotX() 5715 * @see #getPivotY() 5716 * @return The scaling factor. 5717 */ 5718 public float getScaleX() { 5719 return mScaleX; 5720 } 5721 5722 /** 5723 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 5724 * the view's unscaled width. A value of 1 means that no scaling is applied. 5725 * 5726 * @param scaleX The scaling factor. 5727 * @see #getPivotX() 5728 * @see #getPivotY() 5729 * 5730 * @attr ref android.R.styleable#View_scaleX 5731 */ 5732 public void setScaleX(float scaleX) { 5733 if (mScaleX != scaleX) { 5734 // Double-invalidation is necessary to capture view's old and new areas 5735 invalidate(false); 5736 mScaleX = scaleX; 5737 mMatrixDirty = true; 5738 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5739 invalidate(false); 5740 } 5741 } 5742 5743 /** 5744 * The amount that the view is scaled in y around the pivot point, as a proportion of 5745 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 5746 * 5747 * <p>By default, this is 1.0f. 5748 * 5749 * @see #getPivotX() 5750 * @see #getPivotY() 5751 * @return The scaling factor. 5752 */ 5753 public float getScaleY() { 5754 return mScaleY; 5755 } 5756 5757 /** 5758 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 5759 * the view's unscaled width. A value of 1 means that no scaling is applied. 5760 * 5761 * @param scaleY The scaling factor. 5762 * @see #getPivotX() 5763 * @see #getPivotY() 5764 * 5765 * @attr ref android.R.styleable#View_scaleY 5766 */ 5767 public void setScaleY(float scaleY) { 5768 if (mScaleY != scaleY) { 5769 // Double-invalidation is necessary to capture view's old and new areas 5770 invalidate(false); 5771 mScaleY = scaleY; 5772 mMatrixDirty = true; 5773 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5774 invalidate(false); 5775 } 5776 } 5777 5778 /** 5779 * The x location of the point around which the view is {@link #setRotation(float) rotated} 5780 * and {@link #setScaleX(float) scaled}. 5781 * 5782 * @see #getRotation() 5783 * @see #getScaleX() 5784 * @see #getScaleY() 5785 * @see #getPivotY() 5786 * @return The x location of the pivot point. 5787 */ 5788 public float getPivotX() { 5789 return mPivotX; 5790 } 5791 5792 /** 5793 * Sets the x location of the point around which the view is 5794 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 5795 * By default, the pivot point is centered on the object. 5796 * Setting this property disables this behavior and causes the view to use only the 5797 * explicitly set pivotX and pivotY values. 5798 * 5799 * @param pivotX The x location of the pivot point. 5800 * @see #getRotation() 5801 * @see #getScaleX() 5802 * @see #getScaleY() 5803 * @see #getPivotY() 5804 * 5805 * @attr ref android.R.styleable#View_transformPivotX 5806 */ 5807 public void setPivotX(float pivotX) { 5808 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5809 if (mPivotX != pivotX) { 5810 // Double-invalidation is necessary to capture view's old and new areas 5811 invalidate(false); 5812 mPivotX = pivotX; 5813 mMatrixDirty = true; 5814 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5815 invalidate(false); 5816 } 5817 } 5818 5819 /** 5820 * The y location of the point around which the view is {@link #setRotation(float) rotated} 5821 * and {@link #setScaleY(float) scaled}. 5822 * 5823 * @see #getRotation() 5824 * @see #getScaleX() 5825 * @see #getScaleY() 5826 * @see #getPivotY() 5827 * @return The y location of the pivot point. 5828 */ 5829 public float getPivotY() { 5830 return mPivotY; 5831 } 5832 5833 /** 5834 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 5835 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 5836 * Setting this property disables this behavior and causes the view to use only the 5837 * explicitly set pivotX and pivotY values. 5838 * 5839 * @param pivotY The y location of the pivot point. 5840 * @see #getRotation() 5841 * @see #getScaleX() 5842 * @see #getScaleY() 5843 * @see #getPivotY() 5844 * 5845 * @attr ref android.R.styleable#View_transformPivotY 5846 */ 5847 public void setPivotY(float pivotY) { 5848 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5849 if (mPivotY != pivotY) { 5850 // Double-invalidation is necessary to capture view's old and new areas 5851 invalidate(false); 5852 mPivotY = pivotY; 5853 mMatrixDirty = true; 5854 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5855 invalidate(false); 5856 } 5857 } 5858 5859 /** 5860 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 5861 * completely transparent and 1 means the view is completely opaque. 5862 * 5863 * <p>By default this is 1.0f. 5864 * @return The opacity of the view. 5865 */ 5866 public float getAlpha() { 5867 return mAlpha; 5868 } 5869 5870 /** 5871 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 5872 * completely transparent and 1 means the view is completely opaque.</p> 5873 * 5874 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 5875 * responsible for applying the opacity itself. Otherwise, calling this method is 5876 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 5877 * setting a hardware layer.</p> 5878 * 5879 * @param alpha The opacity of the view. 5880 * 5881 * @see #setLayerType(int, android.graphics.Paint) 5882 * 5883 * @attr ref android.R.styleable#View_alpha 5884 */ 5885 public void setAlpha(float alpha) { 5886 mAlpha = alpha; 5887 if (onSetAlpha((int) (alpha * 255))) { 5888 mPrivateFlags |= ALPHA_SET; 5889 // subclass is handling alpha - don't optimize rendering cache invalidation 5890 invalidate(); 5891 } else { 5892 mPrivateFlags &= ~ALPHA_SET; 5893 invalidate(false); 5894 } 5895 } 5896 5897 /** 5898 * Top position of this view relative to its parent. 5899 * 5900 * @return The top of this view, in pixels. 5901 */ 5902 @ViewDebug.CapturedViewProperty 5903 public final int getTop() { 5904 return mTop; 5905 } 5906 5907 /** 5908 * Sets the top position of this view relative to its parent. This method is meant to be called 5909 * by the layout system and should not generally be called otherwise, because the property 5910 * may be changed at any time by the layout. 5911 * 5912 * @param top The top of this view, in pixels. 5913 */ 5914 public final void setTop(int top) { 5915 if (top != mTop) { 5916 updateMatrix(); 5917 if (mMatrixIsIdentity) { 5918 final ViewParent p = mParent; 5919 if (p != null && mAttachInfo != null) { 5920 final Rect r = mAttachInfo.mTmpInvalRect; 5921 int minTop; 5922 int yLoc; 5923 if (top < mTop) { 5924 minTop = top; 5925 yLoc = top - mTop; 5926 } else { 5927 minTop = mTop; 5928 yLoc = 0; 5929 } 5930 r.set(0, yLoc, mRight - mLeft, mBottom - minTop); 5931 p.invalidateChild(this, r); 5932 } 5933 } else { 5934 // Double-invalidation is necessary to capture view's old and new areas 5935 invalidate(); 5936 } 5937 5938 int width = mRight - mLeft; 5939 int oldHeight = mBottom - mTop; 5940 5941 mTop = top; 5942 5943 onSizeChanged(width, mBottom - mTop, width, oldHeight); 5944 5945 if (!mMatrixIsIdentity) { 5946 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5947 // A change in dimension means an auto-centered pivot point changes, too 5948 mMatrixDirty = true; 5949 } 5950 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5951 invalidate(); 5952 } 5953 mBackgroundSizeChanged = true; 5954 } 5955 } 5956 5957 /** 5958 * Bottom position of this view relative to its parent. 5959 * 5960 * @return The bottom of this view, in pixels. 5961 */ 5962 @ViewDebug.CapturedViewProperty 5963 public final int getBottom() { 5964 return mBottom; 5965 } 5966 5967 /** 5968 * True if this view has changed since the last time being drawn. 5969 * 5970 * @return The dirty state of this view. 5971 */ 5972 public boolean isDirty() { 5973 return (mPrivateFlags & DIRTY_MASK) != 0; 5974 } 5975 5976 /** 5977 * Sets the bottom position of this view relative to its parent. This method is meant to be 5978 * called by the layout system and should not generally be called otherwise, because the 5979 * property may be changed at any time by the layout. 5980 * 5981 * @param bottom The bottom of this view, in pixels. 5982 */ 5983 public final void setBottom(int bottom) { 5984 if (bottom != mBottom) { 5985 updateMatrix(); 5986 if (mMatrixIsIdentity) { 5987 final ViewParent p = mParent; 5988 if (p != null && mAttachInfo != null) { 5989 final Rect r = mAttachInfo.mTmpInvalRect; 5990 int maxBottom; 5991 if (bottom < mBottom) { 5992 maxBottom = mBottom; 5993 } else { 5994 maxBottom = bottom; 5995 } 5996 r.set(0, 0, mRight - mLeft, maxBottom - mTop); 5997 p.invalidateChild(this, r); 5998 } 5999 } else { 6000 // Double-invalidation is necessary to capture view's old and new areas 6001 invalidate(); 6002 } 6003 6004 int width = mRight - mLeft; 6005 int oldHeight = mBottom - mTop; 6006 6007 mBottom = bottom; 6008 6009 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6010 6011 if (!mMatrixIsIdentity) { 6012 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6013 // A change in dimension means an auto-centered pivot point changes, too 6014 mMatrixDirty = true; 6015 } 6016 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6017 invalidate(); 6018 } 6019 mBackgroundSizeChanged = true; 6020 } 6021 } 6022 6023 /** 6024 * Left position of this view relative to its parent. 6025 * 6026 * @return The left edge of this view, in pixels. 6027 */ 6028 @ViewDebug.CapturedViewProperty 6029 public final int getLeft() { 6030 return mLeft; 6031 } 6032 6033 /** 6034 * Sets the left position of this view relative to its parent. This method is meant to be called 6035 * by the layout system and should not generally be called otherwise, because the property 6036 * may be changed at any time by the layout. 6037 * 6038 * @param left The bottom of this view, in pixels. 6039 */ 6040 public final void setLeft(int left) { 6041 if (left != mLeft) { 6042 updateMatrix(); 6043 if (mMatrixIsIdentity) { 6044 final ViewParent p = mParent; 6045 if (p != null && mAttachInfo != null) { 6046 final Rect r = mAttachInfo.mTmpInvalRect; 6047 int minLeft; 6048 int xLoc; 6049 if (left < mLeft) { 6050 minLeft = left; 6051 xLoc = left - mLeft; 6052 } else { 6053 minLeft = mLeft; 6054 xLoc = 0; 6055 } 6056 r.set(xLoc, 0, mRight - minLeft, mBottom - mTop); 6057 p.invalidateChild(this, r); 6058 } 6059 } else { 6060 // Double-invalidation is necessary to capture view's old and new areas 6061 invalidate(); 6062 } 6063 6064 int oldWidth = mRight - mLeft; 6065 int height = mBottom - mTop; 6066 6067 mLeft = left; 6068 6069 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6070 6071 if (!mMatrixIsIdentity) { 6072 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6073 // A change in dimension means an auto-centered pivot point changes, too 6074 mMatrixDirty = true; 6075 } 6076 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6077 invalidate(); 6078 } 6079 mBackgroundSizeChanged = true; 6080 } 6081 } 6082 6083 /** 6084 * Right position of this view relative to its parent. 6085 * 6086 * @return The right edge of this view, in pixels. 6087 */ 6088 @ViewDebug.CapturedViewProperty 6089 public final int getRight() { 6090 return mRight; 6091 } 6092 6093 /** 6094 * Sets the right position of this view relative to its parent. This method is meant to be called 6095 * by the layout system and should not generally be called otherwise, because the property 6096 * may be changed at any time by the layout. 6097 * 6098 * @param right The bottom of this view, in pixels. 6099 */ 6100 public final void setRight(int right) { 6101 if (right != mRight) { 6102 updateMatrix(); 6103 if (mMatrixIsIdentity) { 6104 final ViewParent p = mParent; 6105 if (p != null && mAttachInfo != null) { 6106 final Rect r = mAttachInfo.mTmpInvalRect; 6107 int maxRight; 6108 if (right < mRight) { 6109 maxRight = mRight; 6110 } else { 6111 maxRight = right; 6112 } 6113 r.set(0, 0, maxRight - mLeft, mBottom - mTop); 6114 p.invalidateChild(this, r); 6115 } 6116 } else { 6117 // Double-invalidation is necessary to capture view's old and new areas 6118 invalidate(); 6119 } 6120 6121 int oldWidth = mRight - mLeft; 6122 int height = mBottom - mTop; 6123 6124 mRight = right; 6125 6126 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6127 6128 if (!mMatrixIsIdentity) { 6129 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6130 // A change in dimension means an auto-centered pivot point changes, too 6131 mMatrixDirty = true; 6132 } 6133 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6134 invalidate(); 6135 } 6136 mBackgroundSizeChanged = true; 6137 } 6138 } 6139 6140 /** 6141 * The visual x position of this view, in pixels. This is equivalent to the 6142 * {@link #setTranslationX(float) translationX} property plus the current 6143 * {@link #getLeft() left} property. 6144 * 6145 * @return The visual x position of this view, in pixels. 6146 */ 6147 public float getX() { 6148 return mLeft + mTranslationX; 6149 } 6150 6151 /** 6152 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 6153 * {@link #setTranslationX(float) translationX} property to be the difference between 6154 * the x value passed in and the current {@link #getLeft() left} property. 6155 * 6156 * @param x The visual x position of this view, in pixels. 6157 */ 6158 public void setX(float x) { 6159 setTranslationX(x - mLeft); 6160 } 6161 6162 /** 6163 * The visual y position of this view, in pixels. This is equivalent to the 6164 * {@link #setTranslationY(float) translationY} property plus the current 6165 * {@link #getTop() top} property. 6166 * 6167 * @return The visual y position of this view, in pixels. 6168 */ 6169 public float getY() { 6170 return mTop + mTranslationY; 6171 } 6172 6173 /** 6174 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 6175 * {@link #setTranslationY(float) translationY} property to be the difference between 6176 * the y value passed in and the current {@link #getTop() top} property. 6177 * 6178 * @param y The visual y position of this view, in pixels. 6179 */ 6180 public void setY(float y) { 6181 setTranslationY(y - mTop); 6182 } 6183 6184 6185 /** 6186 * The horizontal location of this view relative to its {@link #getLeft() left} position. 6187 * This position is post-layout, in addition to wherever the object's 6188 * layout placed it. 6189 * 6190 * @return The horizontal position of this view relative to its left position, in pixels. 6191 */ 6192 public float getTranslationX() { 6193 return mTranslationX; 6194 } 6195 6196 /** 6197 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 6198 * This effectively positions the object post-layout, in addition to wherever the object's 6199 * layout placed it. 6200 * 6201 * @param translationX The horizontal position of this view relative to its left position, 6202 * in pixels. 6203 * 6204 * @attr ref android.R.styleable#View_translationX 6205 */ 6206 public void setTranslationX(float translationX) { 6207 if (mTranslationX != translationX) { 6208 // Double-invalidation is necessary to capture view's old and new areas 6209 invalidate(false); 6210 mTranslationX = translationX; 6211 mMatrixDirty = true; 6212 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6213 invalidate(false); 6214 } 6215 } 6216 6217 /** 6218 * The horizontal location of this view relative to its {@link #getTop() top} position. 6219 * This position is post-layout, in addition to wherever the object's 6220 * layout placed it. 6221 * 6222 * @return The vertical position of this view relative to its top position, 6223 * in pixels. 6224 */ 6225 public float getTranslationY() { 6226 return mTranslationY; 6227 } 6228 6229 /** 6230 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 6231 * This effectively positions the object post-layout, in addition to wherever the object's 6232 * layout placed it. 6233 * 6234 * @param translationY The vertical position of this view relative to its top position, 6235 * in pixels. 6236 * 6237 * @attr ref android.R.styleable#View_translationY 6238 */ 6239 public void setTranslationY(float translationY) { 6240 if (mTranslationY != translationY) { 6241 // Double-invalidation is necessary to capture view's old and new areas 6242 invalidate(false); 6243 mTranslationY = translationY; 6244 mMatrixDirty = true; 6245 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6246 invalidate(false); 6247 } 6248 } 6249 6250 /** 6251 * Hit rectangle in parent's coordinates 6252 * 6253 * @param outRect The hit rectangle of the view. 6254 */ 6255 public void getHitRect(Rect outRect) { 6256 updateMatrix(); 6257 if (mMatrixIsIdentity || mAttachInfo == null) { 6258 outRect.set(mLeft, mTop, mRight, mBottom); 6259 } else { 6260 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 6261 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 6262 mMatrix.mapRect(tmpRect); 6263 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 6264 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 6265 } 6266 } 6267 6268 /** 6269 * Determines whether the given point, in local coordinates is inside the view. 6270 */ 6271 /*package*/ final boolean pointInView(float localX, float localY) { 6272 return localX >= 0 && localX < (mRight - mLeft) 6273 && localY >= 0 && localY < (mBottom - mTop); 6274 } 6275 6276 /** 6277 * Utility method to determine whether the given point, in local coordinates, 6278 * is inside the view, where the area of the view is expanded by the slop factor. 6279 * This method is called while processing touch-move events to determine if the event 6280 * is still within the view. 6281 */ 6282 private boolean pointInView(float localX, float localY, float slop) { 6283 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 6284 localY < ((mBottom - mTop) + slop); 6285 } 6286 6287 /** 6288 * When a view has focus and the user navigates away from it, the next view is searched for 6289 * starting from the rectangle filled in by this method. 6290 * 6291 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 6292 * view maintains some idea of internal selection, such as a cursor, or a selected row 6293 * or column, you should override this method and fill in a more specific rectangle. 6294 * 6295 * @param r The rectangle to fill in, in this view's coordinates. 6296 */ 6297 public void getFocusedRect(Rect r) { 6298 getDrawingRect(r); 6299 } 6300 6301 /** 6302 * If some part of this view is not clipped by any of its parents, then 6303 * return that area in r in global (root) coordinates. To convert r to local 6304 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 6305 * -globalOffset.y)) If the view is completely clipped or translated out, 6306 * return false. 6307 * 6308 * @param r If true is returned, r holds the global coordinates of the 6309 * visible portion of this view. 6310 * @param globalOffset If true is returned, globalOffset holds the dx,dy 6311 * between this view and its root. globalOffet may be null. 6312 * @return true if r is non-empty (i.e. part of the view is visible at the 6313 * root level. 6314 */ 6315 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 6316 int width = mRight - mLeft; 6317 int height = mBottom - mTop; 6318 if (width > 0 && height > 0) { 6319 r.set(0, 0, width, height); 6320 if (globalOffset != null) { 6321 globalOffset.set(-mScrollX, -mScrollY); 6322 } 6323 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 6324 } 6325 return false; 6326 } 6327 6328 public final boolean getGlobalVisibleRect(Rect r) { 6329 return getGlobalVisibleRect(r, null); 6330 } 6331 6332 public final boolean getLocalVisibleRect(Rect r) { 6333 Point offset = new Point(); 6334 if (getGlobalVisibleRect(r, offset)) { 6335 r.offset(-offset.x, -offset.y); // make r local 6336 return true; 6337 } 6338 return false; 6339 } 6340 6341 /** 6342 * Offset this view's vertical location by the specified number of pixels. 6343 * 6344 * @param offset the number of pixels to offset the view by 6345 */ 6346 public void offsetTopAndBottom(int offset) { 6347 if (offset != 0) { 6348 updateMatrix(); 6349 if (mMatrixIsIdentity) { 6350 final ViewParent p = mParent; 6351 if (p != null && mAttachInfo != null) { 6352 final Rect r = mAttachInfo.mTmpInvalRect; 6353 int minTop; 6354 int maxBottom; 6355 int yLoc; 6356 if (offset < 0) { 6357 minTop = mTop + offset; 6358 maxBottom = mBottom; 6359 yLoc = offset; 6360 } else { 6361 minTop = mTop; 6362 maxBottom = mBottom + offset; 6363 yLoc = 0; 6364 } 6365 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 6366 p.invalidateChild(this, r); 6367 } 6368 } else { 6369 invalidate(false); 6370 } 6371 6372 mTop += offset; 6373 mBottom += offset; 6374 6375 if (!mMatrixIsIdentity) { 6376 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6377 invalidate(false); 6378 } 6379 } 6380 } 6381 6382 /** 6383 * Offset this view's horizontal location by the specified amount of pixels. 6384 * 6385 * @param offset the numer of pixels to offset the view by 6386 */ 6387 public void offsetLeftAndRight(int offset) { 6388 if (offset != 0) { 6389 updateMatrix(); 6390 if (mMatrixIsIdentity) { 6391 final ViewParent p = mParent; 6392 if (p != null && mAttachInfo != null) { 6393 final Rect r = mAttachInfo.mTmpInvalRect; 6394 int minLeft; 6395 int maxRight; 6396 if (offset < 0) { 6397 minLeft = mLeft + offset; 6398 maxRight = mRight; 6399 } else { 6400 minLeft = mLeft; 6401 maxRight = mRight + offset; 6402 } 6403 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 6404 p.invalidateChild(this, r); 6405 } 6406 } else { 6407 invalidate(false); 6408 } 6409 6410 mLeft += offset; 6411 mRight += offset; 6412 6413 if (!mMatrixIsIdentity) { 6414 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6415 invalidate(false); 6416 } 6417 } 6418 } 6419 6420 /** 6421 * Get the LayoutParams associated with this view. All views should have 6422 * layout parameters. These supply parameters to the <i>parent</i> of this 6423 * view specifying how it should be arranged. There are many subclasses of 6424 * ViewGroup.LayoutParams, and these correspond to the different subclasses 6425 * of ViewGroup that are responsible for arranging their children. 6426 * @return The LayoutParams associated with this view 6427 */ 6428 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 6429 public ViewGroup.LayoutParams getLayoutParams() { 6430 return mLayoutParams; 6431 } 6432 6433 /** 6434 * Set the layout parameters associated with this view. These supply 6435 * parameters to the <i>parent</i> of this view specifying how it should be 6436 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 6437 * correspond to the different subclasses of ViewGroup that are responsible 6438 * for arranging their children. 6439 * 6440 * @param params the layout parameters for this view 6441 */ 6442 public void setLayoutParams(ViewGroup.LayoutParams params) { 6443 if (params == null) { 6444 throw new NullPointerException("params == null"); 6445 } 6446 mLayoutParams = params; 6447 requestLayout(); 6448 } 6449 6450 /** 6451 * Set the scrolled position of your view. This will cause a call to 6452 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6453 * invalidated. 6454 * @param x the x position to scroll to 6455 * @param y the y position to scroll to 6456 */ 6457 public void scrollTo(int x, int y) { 6458 if (mScrollX != x || mScrollY != y) { 6459 int oldX = mScrollX; 6460 int oldY = mScrollY; 6461 mScrollX = x; 6462 mScrollY = y; 6463 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 6464 if (!awakenScrollBars()) { 6465 invalidate(); 6466 } 6467 } 6468 } 6469 6470 /** 6471 * Move the scrolled position of your view. This will cause a call to 6472 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6473 * invalidated. 6474 * @param x the amount of pixels to scroll by horizontally 6475 * @param y the amount of pixels to scroll by vertically 6476 */ 6477 public void scrollBy(int x, int y) { 6478 scrollTo(mScrollX + x, mScrollY + y); 6479 } 6480 6481 /** 6482 * <p>Trigger the scrollbars to draw. When invoked this method starts an 6483 * animation to fade the scrollbars out after a default delay. If a subclass 6484 * provides animated scrolling, the start delay should equal the duration 6485 * of the scrolling animation.</p> 6486 * 6487 * <p>The animation starts only if at least one of the scrollbars is 6488 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 6489 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6490 * this method returns true, and false otherwise. If the animation is 6491 * started, this method calls {@link #invalidate()}; in that case the 6492 * caller should not call {@link #invalidate()}.</p> 6493 * 6494 * <p>This method should be invoked every time a subclass directly updates 6495 * the scroll parameters.</p> 6496 * 6497 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6498 * and {@link #scrollTo(int, int)}.</p> 6499 * 6500 * @return true if the animation is played, false otherwise 6501 * 6502 * @see #awakenScrollBars(int) 6503 * @see #scrollBy(int, int) 6504 * @see #scrollTo(int, int) 6505 * @see #isHorizontalScrollBarEnabled() 6506 * @see #isVerticalScrollBarEnabled() 6507 * @see #setHorizontalScrollBarEnabled(boolean) 6508 * @see #setVerticalScrollBarEnabled(boolean) 6509 */ 6510 protected boolean awakenScrollBars() { 6511 return mScrollCache != null && 6512 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6513 } 6514 6515 /** 6516 * Trigger the scrollbars to draw. 6517 * This method differs from awakenScrollBars() only in its default duration. 6518 * initialAwakenScrollBars() will show the scroll bars for longer than 6519 * usual to give the user more of a chance to notice them. 6520 * 6521 * @return true if the animation is played, false otherwise. 6522 */ 6523 private boolean initialAwakenScrollBars() { 6524 return mScrollCache != null && 6525 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6526 } 6527 6528 /** 6529 * <p> 6530 * Trigger the scrollbars to draw. When invoked this method starts an 6531 * animation to fade the scrollbars out after a fixed delay. If a subclass 6532 * provides animated scrolling, the start delay should equal the duration of 6533 * the scrolling animation. 6534 * </p> 6535 * 6536 * <p> 6537 * The animation starts only if at least one of the scrollbars is enabled, 6538 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6539 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6540 * this method returns true, and false otherwise. If the animation is 6541 * started, this method calls {@link #invalidate()}; in that case the caller 6542 * should not call {@link #invalidate()}. 6543 * </p> 6544 * 6545 * <p> 6546 * This method should be invoked everytime a subclass directly updates the 6547 * scroll parameters. 6548 * </p> 6549 * 6550 * @param startDelay the delay, in milliseconds, after which the animation 6551 * should start; when the delay is 0, the animation starts 6552 * immediately 6553 * @return true if the animation is played, false otherwise 6554 * 6555 * @see #scrollBy(int, int) 6556 * @see #scrollTo(int, int) 6557 * @see #isHorizontalScrollBarEnabled() 6558 * @see #isVerticalScrollBarEnabled() 6559 * @see #setHorizontalScrollBarEnabled(boolean) 6560 * @see #setVerticalScrollBarEnabled(boolean) 6561 */ 6562 protected boolean awakenScrollBars(int startDelay) { 6563 return awakenScrollBars(startDelay, true); 6564 } 6565 6566 /** 6567 * <p> 6568 * Trigger the scrollbars to draw. When invoked this method starts an 6569 * animation to fade the scrollbars out after a fixed delay. If a subclass 6570 * provides animated scrolling, the start delay should equal the duration of 6571 * the scrolling animation. 6572 * </p> 6573 * 6574 * <p> 6575 * The animation starts only if at least one of the scrollbars is enabled, 6576 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6577 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6578 * this method returns true, and false otherwise. If the animation is 6579 * started, this method calls {@link #invalidate()} if the invalidate parameter 6580 * is set to true; in that case the caller 6581 * should not call {@link #invalidate()}. 6582 * </p> 6583 * 6584 * <p> 6585 * This method should be invoked everytime a subclass directly updates the 6586 * scroll parameters. 6587 * </p> 6588 * 6589 * @param startDelay the delay, in milliseconds, after which the animation 6590 * should start; when the delay is 0, the animation starts 6591 * immediately 6592 * 6593 * @param invalidate Wheter this method should call invalidate 6594 * 6595 * @return true if the animation is played, false otherwise 6596 * 6597 * @see #scrollBy(int, int) 6598 * @see #scrollTo(int, int) 6599 * @see #isHorizontalScrollBarEnabled() 6600 * @see #isVerticalScrollBarEnabled() 6601 * @see #setHorizontalScrollBarEnabled(boolean) 6602 * @see #setVerticalScrollBarEnabled(boolean) 6603 */ 6604 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 6605 final ScrollabilityCache scrollCache = mScrollCache; 6606 6607 if (scrollCache == null || !scrollCache.fadeScrollBars) { 6608 return false; 6609 } 6610 6611 if (scrollCache.scrollBar == null) { 6612 scrollCache.scrollBar = new ScrollBarDrawable(); 6613 } 6614 6615 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 6616 6617 if (invalidate) { 6618 // Invalidate to show the scrollbars 6619 invalidate(); 6620 } 6621 6622 if (scrollCache.state == ScrollabilityCache.OFF) { 6623 // FIXME: this is copied from WindowManagerService. 6624 // We should get this value from the system when it 6625 // is possible to do so. 6626 final int KEY_REPEAT_FIRST_DELAY = 750; 6627 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 6628 } 6629 6630 // Tell mScrollCache when we should start fading. This may 6631 // extend the fade start time if one was already scheduled 6632 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 6633 scrollCache.fadeStartTime = fadeStartTime; 6634 scrollCache.state = ScrollabilityCache.ON; 6635 6636 // Schedule our fader to run, unscheduling any old ones first 6637 if (mAttachInfo != null) { 6638 mAttachInfo.mHandler.removeCallbacks(scrollCache); 6639 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 6640 } 6641 6642 return true; 6643 } 6644 6645 return false; 6646 } 6647 6648 /** 6649 * Mark the the area defined by dirty as needing to be drawn. If the view is 6650 * visible, {@link #onDraw} will be called at some point in the future. 6651 * This must be called from a UI thread. To call from a non-UI thread, call 6652 * {@link #postInvalidate()}. 6653 * 6654 * WARNING: This method is destructive to dirty. 6655 * @param dirty the rectangle representing the bounds of the dirty region 6656 */ 6657 public void invalidate(Rect dirty) { 6658 if (ViewDebug.TRACE_HIERARCHY) { 6659 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6660 } 6661 6662 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6663 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6664 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6665 final ViewParent p = mParent; 6666 final AttachInfo ai = mAttachInfo; 6667 if (p != null && ai != null && ai.mHardwareAccelerated) { 6668 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6669 // with a null dirty rect, which tells the ViewRoot to redraw everything 6670 p.invalidateChild(this, null); 6671 return; 6672 } 6673 if (p != null && ai != null) { 6674 final int scrollX = mScrollX; 6675 final int scrollY = mScrollY; 6676 final Rect r = ai.mTmpInvalRect; 6677 r.set(dirty.left - scrollX, dirty.top - scrollY, 6678 dirty.right - scrollX, dirty.bottom - scrollY); 6679 mParent.invalidateChild(this, r); 6680 } 6681 } 6682 } 6683 6684 /** 6685 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 6686 * The coordinates of the dirty rect are relative to the view. 6687 * If the view is visible, {@link #onDraw} will be called at some point 6688 * in the future. This must be called from a UI thread. To call 6689 * from a non-UI thread, call {@link #postInvalidate()}. 6690 * @param l the left position of the dirty region 6691 * @param t the top position of the dirty region 6692 * @param r the right position of the dirty region 6693 * @param b the bottom position of the dirty region 6694 */ 6695 public void invalidate(int l, int t, int r, int b) { 6696 if (ViewDebug.TRACE_HIERARCHY) { 6697 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6698 } 6699 6700 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6701 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6702 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6703 final ViewParent p = mParent; 6704 final AttachInfo ai = mAttachInfo; 6705 if (p != null && ai != null && ai.mHardwareAccelerated) { 6706 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6707 // with a null dirty rect, which tells the ViewRoot to redraw everything 6708 p.invalidateChild(this, null); 6709 return; 6710 } 6711 if (p != null && ai != null && l < r && t < b) { 6712 final int scrollX = mScrollX; 6713 final int scrollY = mScrollY; 6714 final Rect tmpr = ai.mTmpInvalRect; 6715 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 6716 p.invalidateChild(this, tmpr); 6717 } 6718 } 6719 } 6720 6721 /** 6722 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 6723 * be called at some point in the future. This must be called from a 6724 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 6725 */ 6726 public void invalidate() { 6727 invalidate(true); 6728 } 6729 6730 /** 6731 * This is where the invalidate() work actually happens. A full invalidate() 6732 * causes the drawing cache to be invalidated, but this function can be called with 6733 * invalidateCache set to false to skip that invalidation step for cases that do not 6734 * need it (for example, a component that remains at the same dimensions with the same 6735 * content). 6736 * 6737 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 6738 * well. This is usually true for a full invalidate, but may be set to false if the 6739 * View's contents or dimensions have not changed. 6740 */ 6741 private void invalidate(boolean invalidateCache) { 6742 if (ViewDebug.TRACE_HIERARCHY) { 6743 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6744 } 6745 6746 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6747 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID)) { 6748 mPrivateFlags &= ~DRAWN; 6749 if (invalidateCache) { 6750 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6751 } 6752 final AttachInfo ai = mAttachInfo; 6753 final ViewParent p = mParent; 6754 if (p != null && ai != null && ai.mHardwareAccelerated) { 6755 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6756 // with a null dirty rect, which tells the ViewRoot to redraw everything 6757 p.invalidateChild(this, null); 6758 return; 6759 } 6760 6761 if (p != null && ai != null) { 6762 final Rect r = ai.mTmpInvalRect; 6763 r.set(0, 0, mRight - mLeft, mBottom - mTop); 6764 // Don't call invalidate -- we don't want to internally scroll 6765 // our own bounds 6766 p.invalidateChild(this, r); 6767 } 6768 } 6769 } 6770 6771 /** 6772 * Indicates whether this View is opaque. An opaque View guarantees that it will 6773 * draw all the pixels overlapping its bounds using a fully opaque color. 6774 * 6775 * Subclasses of View should override this method whenever possible to indicate 6776 * whether an instance is opaque. Opaque Views are treated in a special way by 6777 * the View hierarchy, possibly allowing it to perform optimizations during 6778 * invalidate/draw passes. 6779 * 6780 * @return True if this View is guaranteed to be fully opaque, false otherwise. 6781 */ 6782 @ViewDebug.ExportedProperty(category = "drawing") 6783 public boolean isOpaque() { 6784 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 6785 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 6786 } 6787 6788 /** 6789 * @hide 6790 */ 6791 protected void computeOpaqueFlags() { 6792 // Opaque if: 6793 // - Has a background 6794 // - Background is opaque 6795 // - Doesn't have scrollbars or scrollbars are inside overlay 6796 6797 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 6798 mPrivateFlags |= OPAQUE_BACKGROUND; 6799 } else { 6800 mPrivateFlags &= ~OPAQUE_BACKGROUND; 6801 } 6802 6803 final int flags = mViewFlags; 6804 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 6805 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 6806 mPrivateFlags |= OPAQUE_SCROLLBARS; 6807 } else { 6808 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 6809 } 6810 } 6811 6812 /** 6813 * @hide 6814 */ 6815 protected boolean hasOpaqueScrollbars() { 6816 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 6817 } 6818 6819 /** 6820 * @return A handler associated with the thread running the View. This 6821 * handler can be used to pump events in the UI events queue. 6822 */ 6823 public Handler getHandler() { 6824 if (mAttachInfo != null) { 6825 return mAttachInfo.mHandler; 6826 } 6827 return null; 6828 } 6829 6830 /** 6831 * Causes the Runnable to be added to the message queue. 6832 * The runnable will be run on the user interface thread. 6833 * 6834 * @param action The Runnable that will be executed. 6835 * 6836 * @return Returns true if the Runnable was successfully placed in to the 6837 * message queue. Returns false on failure, usually because the 6838 * looper processing the message queue is exiting. 6839 */ 6840 public boolean post(Runnable action) { 6841 Handler handler; 6842 if (mAttachInfo != null) { 6843 handler = mAttachInfo.mHandler; 6844 } else { 6845 // Assume that post will succeed later 6846 ViewRoot.getRunQueue().post(action); 6847 return true; 6848 } 6849 6850 return handler.post(action); 6851 } 6852 6853 /** 6854 * Causes the Runnable to be added to the message queue, to be run 6855 * after the specified amount of time elapses. 6856 * The runnable will be run on the user interface thread. 6857 * 6858 * @param action The Runnable that will be executed. 6859 * @param delayMillis The delay (in milliseconds) until the Runnable 6860 * will be executed. 6861 * 6862 * @return true if the Runnable was successfully placed in to the 6863 * message queue. Returns false on failure, usually because the 6864 * looper processing the message queue is exiting. Note that a 6865 * result of true does not mean the Runnable will be processed -- 6866 * if the looper is quit before the delivery time of the message 6867 * occurs then the message will be dropped. 6868 */ 6869 public boolean postDelayed(Runnable action, long delayMillis) { 6870 Handler handler; 6871 if (mAttachInfo != null) { 6872 handler = mAttachInfo.mHandler; 6873 } else { 6874 // Assume that post will succeed later 6875 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 6876 return true; 6877 } 6878 6879 return handler.postDelayed(action, delayMillis); 6880 } 6881 6882 /** 6883 * Removes the specified Runnable from the message queue. 6884 * 6885 * @param action The Runnable to remove from the message handling queue 6886 * 6887 * @return true if this view could ask the Handler to remove the Runnable, 6888 * false otherwise. When the returned value is true, the Runnable 6889 * may or may not have been actually removed from the message queue 6890 * (for instance, if the Runnable was not in the queue already.) 6891 */ 6892 public boolean removeCallbacks(Runnable action) { 6893 Handler handler; 6894 if (mAttachInfo != null) { 6895 handler = mAttachInfo.mHandler; 6896 } else { 6897 // Assume that post will succeed later 6898 ViewRoot.getRunQueue().removeCallbacks(action); 6899 return true; 6900 } 6901 6902 handler.removeCallbacks(action); 6903 return true; 6904 } 6905 6906 /** 6907 * Cause an invalidate to happen on a subsequent cycle through the event loop. 6908 * Use this to invalidate the View from a non-UI thread. 6909 * 6910 * @see #invalidate() 6911 */ 6912 public void postInvalidate() { 6913 postInvalidateDelayed(0); 6914 } 6915 6916 /** 6917 * Cause an invalidate of the specified area to happen on a subsequent cycle 6918 * through the event loop. Use this to invalidate the View from a non-UI thread. 6919 * 6920 * @param left The left coordinate of the rectangle to invalidate. 6921 * @param top The top coordinate of the rectangle to invalidate. 6922 * @param right The right coordinate of the rectangle to invalidate. 6923 * @param bottom The bottom coordinate of the rectangle to invalidate. 6924 * 6925 * @see #invalidate(int, int, int, int) 6926 * @see #invalidate(Rect) 6927 */ 6928 public void postInvalidate(int left, int top, int right, int bottom) { 6929 postInvalidateDelayed(0, left, top, right, bottom); 6930 } 6931 6932 /** 6933 * Cause an invalidate to happen on a subsequent cycle through the event 6934 * loop. Waits for the specified amount of time. 6935 * 6936 * @param delayMilliseconds the duration in milliseconds to delay the 6937 * invalidation by 6938 */ 6939 public void postInvalidateDelayed(long delayMilliseconds) { 6940 // We try only with the AttachInfo because there's no point in invalidating 6941 // if we are not attached to our window 6942 if (mAttachInfo != null) { 6943 Message msg = Message.obtain(); 6944 msg.what = AttachInfo.INVALIDATE_MSG; 6945 msg.obj = this; 6946 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6947 } 6948 } 6949 6950 /** 6951 * Cause an invalidate of the specified area to happen on a subsequent cycle 6952 * through the event loop. Waits for the specified amount of time. 6953 * 6954 * @param delayMilliseconds the duration in milliseconds to delay the 6955 * invalidation by 6956 * @param left The left coordinate of the rectangle to invalidate. 6957 * @param top The top coordinate of the rectangle to invalidate. 6958 * @param right The right coordinate of the rectangle to invalidate. 6959 * @param bottom The bottom coordinate of the rectangle to invalidate. 6960 */ 6961 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 6962 int right, int bottom) { 6963 6964 // We try only with the AttachInfo because there's no point in invalidating 6965 // if we are not attached to our window 6966 if (mAttachInfo != null) { 6967 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 6968 info.target = this; 6969 info.left = left; 6970 info.top = top; 6971 info.right = right; 6972 info.bottom = bottom; 6973 6974 final Message msg = Message.obtain(); 6975 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 6976 msg.obj = info; 6977 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6978 } 6979 } 6980 6981 /** 6982 * Called by a parent to request that a child update its values for mScrollX 6983 * and mScrollY if necessary. This will typically be done if the child is 6984 * animating a scroll using a {@link android.widget.Scroller Scroller} 6985 * object. 6986 */ 6987 public void computeScroll() { 6988 } 6989 6990 /** 6991 * <p>Indicate whether the horizontal edges are faded when the view is 6992 * scrolled horizontally.</p> 6993 * 6994 * @return true if the horizontal edges should are faded on scroll, false 6995 * otherwise 6996 * 6997 * @see #setHorizontalFadingEdgeEnabled(boolean) 6998 * @attr ref android.R.styleable#View_fadingEdge 6999 */ 7000 public boolean isHorizontalFadingEdgeEnabled() { 7001 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 7002 } 7003 7004 /** 7005 * <p>Define whether the horizontal edges should be faded when this view 7006 * is scrolled horizontally.</p> 7007 * 7008 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 7009 * be faded when the view is scrolled 7010 * horizontally 7011 * 7012 * @see #isHorizontalFadingEdgeEnabled() 7013 * @attr ref android.R.styleable#View_fadingEdge 7014 */ 7015 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 7016 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 7017 if (horizontalFadingEdgeEnabled) { 7018 initScrollCache(); 7019 } 7020 7021 mViewFlags ^= FADING_EDGE_HORIZONTAL; 7022 } 7023 } 7024 7025 /** 7026 * <p>Indicate whether the vertical edges are faded when the view is 7027 * scrolled horizontally.</p> 7028 * 7029 * @return true if the vertical edges should are faded on scroll, false 7030 * otherwise 7031 * 7032 * @see #setVerticalFadingEdgeEnabled(boolean) 7033 * @attr ref android.R.styleable#View_fadingEdge 7034 */ 7035 public boolean isVerticalFadingEdgeEnabled() { 7036 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 7037 } 7038 7039 /** 7040 * <p>Define whether the vertical edges should be faded when this view 7041 * is scrolled vertically.</p> 7042 * 7043 * @param verticalFadingEdgeEnabled true if the vertical edges should 7044 * be faded when the view is scrolled 7045 * vertically 7046 * 7047 * @see #isVerticalFadingEdgeEnabled() 7048 * @attr ref android.R.styleable#View_fadingEdge 7049 */ 7050 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 7051 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 7052 if (verticalFadingEdgeEnabled) { 7053 initScrollCache(); 7054 } 7055 7056 mViewFlags ^= FADING_EDGE_VERTICAL; 7057 } 7058 } 7059 7060 /** 7061 * Returns the strength, or intensity, of the top faded edge. The strength is 7062 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7063 * returns 0.0 or 1.0 but no value in between. 7064 * 7065 * Subclasses should override this method to provide a smoother fade transition 7066 * when scrolling occurs. 7067 * 7068 * @return the intensity of the top fade as a float between 0.0f and 1.0f 7069 */ 7070 protected float getTopFadingEdgeStrength() { 7071 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 7072 } 7073 7074 /** 7075 * Returns the strength, or intensity, of the bottom faded edge. The strength is 7076 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7077 * returns 0.0 or 1.0 but no value in between. 7078 * 7079 * Subclasses should override this method to provide a smoother fade transition 7080 * when scrolling occurs. 7081 * 7082 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 7083 */ 7084 protected float getBottomFadingEdgeStrength() { 7085 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 7086 computeVerticalScrollRange() ? 1.0f : 0.0f; 7087 } 7088 7089 /** 7090 * Returns the strength, or intensity, of the left faded edge. The strength is 7091 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7092 * returns 0.0 or 1.0 but no value in between. 7093 * 7094 * Subclasses should override this method to provide a smoother fade transition 7095 * when scrolling occurs. 7096 * 7097 * @return the intensity of the left fade as a float between 0.0f and 1.0f 7098 */ 7099 protected float getLeftFadingEdgeStrength() { 7100 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 7101 } 7102 7103 /** 7104 * Returns the strength, or intensity, of the right faded edge. The strength is 7105 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7106 * returns 0.0 or 1.0 but no value in between. 7107 * 7108 * Subclasses should override this method to provide a smoother fade transition 7109 * when scrolling occurs. 7110 * 7111 * @return the intensity of the right fade as a float between 0.0f and 1.0f 7112 */ 7113 protected float getRightFadingEdgeStrength() { 7114 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 7115 computeHorizontalScrollRange() ? 1.0f : 0.0f; 7116 } 7117 7118 /** 7119 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 7120 * scrollbar is not drawn by default.</p> 7121 * 7122 * @return true if the horizontal scrollbar should be painted, false 7123 * otherwise 7124 * 7125 * @see #setHorizontalScrollBarEnabled(boolean) 7126 */ 7127 public boolean isHorizontalScrollBarEnabled() { 7128 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7129 } 7130 7131 /** 7132 * <p>Define whether the horizontal scrollbar should be drawn or not. The 7133 * scrollbar is not drawn by default.</p> 7134 * 7135 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 7136 * be painted 7137 * 7138 * @see #isHorizontalScrollBarEnabled() 7139 */ 7140 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 7141 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 7142 mViewFlags ^= SCROLLBARS_HORIZONTAL; 7143 computeOpaqueFlags(); 7144 recomputePadding(); 7145 } 7146 } 7147 7148 /** 7149 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 7150 * scrollbar is not drawn by default.</p> 7151 * 7152 * @return true if the vertical scrollbar should be painted, false 7153 * otherwise 7154 * 7155 * @see #setVerticalScrollBarEnabled(boolean) 7156 */ 7157 public boolean isVerticalScrollBarEnabled() { 7158 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 7159 } 7160 7161 /** 7162 * <p>Define whether the vertical scrollbar should be drawn or not. The 7163 * scrollbar is not drawn by default.</p> 7164 * 7165 * @param verticalScrollBarEnabled true if the vertical scrollbar should 7166 * be painted 7167 * 7168 * @see #isVerticalScrollBarEnabled() 7169 */ 7170 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 7171 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 7172 mViewFlags ^= SCROLLBARS_VERTICAL; 7173 computeOpaqueFlags(); 7174 recomputePadding(); 7175 } 7176 } 7177 7178 /** 7179 * @hide 7180 */ 7181 protected void recomputePadding() { 7182 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 7183 } 7184 7185 /** 7186 * Define whether scrollbars will fade when the view is not scrolling. 7187 * 7188 * @param fadeScrollbars wheter to enable fading 7189 * 7190 */ 7191 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 7192 initScrollCache(); 7193 final ScrollabilityCache scrollabilityCache = mScrollCache; 7194 scrollabilityCache.fadeScrollBars = fadeScrollbars; 7195 if (fadeScrollbars) { 7196 scrollabilityCache.state = ScrollabilityCache.OFF; 7197 } else { 7198 scrollabilityCache.state = ScrollabilityCache.ON; 7199 } 7200 } 7201 7202 /** 7203 * 7204 * Returns true if scrollbars will fade when this view is not scrolling 7205 * 7206 * @return true if scrollbar fading is enabled 7207 */ 7208 public boolean isScrollbarFadingEnabled() { 7209 return mScrollCache != null && mScrollCache.fadeScrollBars; 7210 } 7211 7212 /** 7213 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 7214 * inset. When inset, they add to the padding of the view. And the scrollbars 7215 * can be drawn inside the padding area or on the edge of the view. For example, 7216 * if a view has a background drawable and you want to draw the scrollbars 7217 * inside the padding specified by the drawable, you can use 7218 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 7219 * appear at the edge of the view, ignoring the padding, then you can use 7220 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 7221 * @param style the style of the scrollbars. Should be one of 7222 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 7223 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 7224 * @see #SCROLLBARS_INSIDE_OVERLAY 7225 * @see #SCROLLBARS_INSIDE_INSET 7226 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7227 * @see #SCROLLBARS_OUTSIDE_INSET 7228 */ 7229 public void setScrollBarStyle(int style) { 7230 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 7231 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 7232 computeOpaqueFlags(); 7233 recomputePadding(); 7234 } 7235 } 7236 7237 /** 7238 * <p>Returns the current scrollbar style.</p> 7239 * @return the current scrollbar style 7240 * @see #SCROLLBARS_INSIDE_OVERLAY 7241 * @see #SCROLLBARS_INSIDE_INSET 7242 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7243 * @see #SCROLLBARS_OUTSIDE_INSET 7244 */ 7245 public int getScrollBarStyle() { 7246 return mViewFlags & SCROLLBARS_STYLE_MASK; 7247 } 7248 7249 /** 7250 * <p>Compute the horizontal range that the horizontal scrollbar 7251 * represents.</p> 7252 * 7253 * <p>The range is expressed in arbitrary units that must be the same as the 7254 * units used by {@link #computeHorizontalScrollExtent()} and 7255 * {@link #computeHorizontalScrollOffset()}.</p> 7256 * 7257 * <p>The default range is the drawing width of this view.</p> 7258 * 7259 * @return the total horizontal range represented by the horizontal 7260 * scrollbar 7261 * 7262 * @see #computeHorizontalScrollExtent() 7263 * @see #computeHorizontalScrollOffset() 7264 * @see android.widget.ScrollBarDrawable 7265 */ 7266 protected int computeHorizontalScrollRange() { 7267 return getWidth(); 7268 } 7269 7270 /** 7271 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 7272 * within the horizontal range. This value is used to compute the position 7273 * of the thumb within the scrollbar's track.</p> 7274 * 7275 * <p>The range is expressed in arbitrary units that must be the same as the 7276 * units used by {@link #computeHorizontalScrollRange()} and 7277 * {@link #computeHorizontalScrollExtent()}.</p> 7278 * 7279 * <p>The default offset is the scroll offset of this view.</p> 7280 * 7281 * @return the horizontal offset of the scrollbar's thumb 7282 * 7283 * @see #computeHorizontalScrollRange() 7284 * @see #computeHorizontalScrollExtent() 7285 * @see android.widget.ScrollBarDrawable 7286 */ 7287 protected int computeHorizontalScrollOffset() { 7288 return mScrollX; 7289 } 7290 7291 /** 7292 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 7293 * within the horizontal range. This value is used to compute the length 7294 * of the thumb within the scrollbar's track.</p> 7295 * 7296 * <p>The range is expressed in arbitrary units that must be the same as the 7297 * units used by {@link #computeHorizontalScrollRange()} and 7298 * {@link #computeHorizontalScrollOffset()}.</p> 7299 * 7300 * <p>The default extent is the drawing width of this view.</p> 7301 * 7302 * @return the horizontal extent of the scrollbar's thumb 7303 * 7304 * @see #computeHorizontalScrollRange() 7305 * @see #computeHorizontalScrollOffset() 7306 * @see android.widget.ScrollBarDrawable 7307 */ 7308 protected int computeHorizontalScrollExtent() { 7309 return getWidth(); 7310 } 7311 7312 /** 7313 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 7314 * 7315 * <p>The range is expressed in arbitrary units that must be the same as the 7316 * units used by {@link #computeVerticalScrollExtent()} and 7317 * {@link #computeVerticalScrollOffset()}.</p> 7318 * 7319 * @return the total vertical range represented by the vertical scrollbar 7320 * 7321 * <p>The default range is the drawing height of this view.</p> 7322 * 7323 * @see #computeVerticalScrollExtent() 7324 * @see #computeVerticalScrollOffset() 7325 * @see android.widget.ScrollBarDrawable 7326 */ 7327 protected int computeVerticalScrollRange() { 7328 return getHeight(); 7329 } 7330 7331 /** 7332 * <p>Compute the vertical offset of the vertical scrollbar's thumb 7333 * within the horizontal range. This value is used to compute the position 7334 * of the thumb within the scrollbar's track.</p> 7335 * 7336 * <p>The range is expressed in arbitrary units that must be the same as the 7337 * units used by {@link #computeVerticalScrollRange()} and 7338 * {@link #computeVerticalScrollExtent()}.</p> 7339 * 7340 * <p>The default offset is the scroll offset of this view.</p> 7341 * 7342 * @return the vertical offset of the scrollbar's thumb 7343 * 7344 * @see #computeVerticalScrollRange() 7345 * @see #computeVerticalScrollExtent() 7346 * @see android.widget.ScrollBarDrawable 7347 */ 7348 protected int computeVerticalScrollOffset() { 7349 return mScrollY; 7350 } 7351 7352 /** 7353 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 7354 * within the vertical range. This value is used to compute the length 7355 * of the thumb within the scrollbar's track.</p> 7356 * 7357 * <p>The range is expressed in arbitrary units that must be the same as the 7358 * units used by {@link #computeVerticalScrollRange()} and 7359 * {@link #computeVerticalScrollOffset()}.</p> 7360 * 7361 * <p>The default extent is the drawing height of this view.</p> 7362 * 7363 * @return the vertical extent of the scrollbar's thumb 7364 * 7365 * @see #computeVerticalScrollRange() 7366 * @see #computeVerticalScrollOffset() 7367 * @see android.widget.ScrollBarDrawable 7368 */ 7369 protected int computeVerticalScrollExtent() { 7370 return getHeight(); 7371 } 7372 7373 /** 7374 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 7375 * scrollbars are painted only if they have been awakened first.</p> 7376 * 7377 * @param canvas the canvas on which to draw the scrollbars 7378 * 7379 * @see #awakenScrollBars(int) 7380 */ 7381 protected final void onDrawScrollBars(Canvas canvas) { 7382 // scrollbars are drawn only when the animation is running 7383 final ScrollabilityCache cache = mScrollCache; 7384 if (cache != null) { 7385 7386 int state = cache.state; 7387 7388 if (state == ScrollabilityCache.OFF) { 7389 return; 7390 } 7391 7392 boolean invalidate = false; 7393 7394 if (state == ScrollabilityCache.FADING) { 7395 // We're fading -- get our fade interpolation 7396 if (cache.interpolatorValues == null) { 7397 cache.interpolatorValues = new float[1]; 7398 } 7399 7400 float[] values = cache.interpolatorValues; 7401 7402 // Stops the animation if we're done 7403 if (cache.scrollBarInterpolator.timeToValues(values) == 7404 Interpolator.Result.FREEZE_END) { 7405 cache.state = ScrollabilityCache.OFF; 7406 } else { 7407 cache.scrollBar.setAlpha(Math.round(values[0])); 7408 } 7409 7410 // This will make the scroll bars inval themselves after 7411 // drawing. We only want this when we're fading so that 7412 // we prevent excessive redraws 7413 invalidate = true; 7414 } else { 7415 // We're just on -- but we may have been fading before so 7416 // reset alpha 7417 cache.scrollBar.setAlpha(255); 7418 } 7419 7420 7421 final int viewFlags = mViewFlags; 7422 7423 final boolean drawHorizontalScrollBar = 7424 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7425 final boolean drawVerticalScrollBar = 7426 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 7427 && !isVerticalScrollBarHidden(); 7428 7429 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 7430 final int width = mRight - mLeft; 7431 final int height = mBottom - mTop; 7432 7433 final ScrollBarDrawable scrollBar = cache.scrollBar; 7434 int size = scrollBar.getSize(false); 7435 if (size <= 0) { 7436 size = cache.scrollBarSize; 7437 } 7438 7439 final int scrollX = mScrollX; 7440 final int scrollY = mScrollY; 7441 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 7442 7443 int left, top, right, bottom; 7444 7445 if (drawHorizontalScrollBar) { 7446 scrollBar.setParameters(computeHorizontalScrollRange(), 7447 computeHorizontalScrollOffset(), 7448 computeHorizontalScrollExtent(), false); 7449 final int verticalScrollBarGap = drawVerticalScrollBar ? 7450 getVerticalScrollbarWidth() : 0; 7451 top = scrollY + height - size - (mUserPaddingBottom & inside); 7452 left = scrollX + (mPaddingLeft & inside); 7453 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 7454 bottom = top + size; 7455 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 7456 if (invalidate) { 7457 invalidate(left, top, right, bottom); 7458 } 7459 } 7460 7461 if (drawVerticalScrollBar) { 7462 scrollBar.setParameters(computeVerticalScrollRange(), 7463 computeVerticalScrollOffset(), 7464 computeVerticalScrollExtent(), true); 7465 switch (mVerticalScrollbarPosition) { 7466 default: 7467 case SCROLLBAR_POSITION_DEFAULT: 7468 case SCROLLBAR_POSITION_RIGHT: 7469 left = scrollX + width - size - (mUserPaddingRight & inside); 7470 break; 7471 case SCROLLBAR_POSITION_LEFT: 7472 left = scrollX + (mUserPaddingLeft & inside); 7473 break; 7474 } 7475 top = scrollY + (mPaddingTop & inside); 7476 right = left + size; 7477 bottom = scrollY + height - (mUserPaddingBottom & inside); 7478 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 7479 if (invalidate) { 7480 invalidate(left, top, right, bottom); 7481 } 7482 } 7483 } 7484 } 7485 } 7486 7487 /** 7488 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 7489 * FastScroller is visible. 7490 * @return whether to temporarily hide the vertical scrollbar 7491 * @hide 7492 */ 7493 protected boolean isVerticalScrollBarHidden() { 7494 return false; 7495 } 7496 7497 /** 7498 * <p>Draw the horizontal scrollbar if 7499 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 7500 * 7501 * @param canvas the canvas on which to draw the scrollbar 7502 * @param scrollBar the scrollbar's drawable 7503 * 7504 * @see #isHorizontalScrollBarEnabled() 7505 * @see #computeHorizontalScrollRange() 7506 * @see #computeHorizontalScrollExtent() 7507 * @see #computeHorizontalScrollOffset() 7508 * @see android.widget.ScrollBarDrawable 7509 * @hide 7510 */ 7511 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 7512 int l, int t, int r, int b) { 7513 scrollBar.setBounds(l, t, r, b); 7514 scrollBar.draw(canvas); 7515 } 7516 7517 /** 7518 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 7519 * returns true.</p> 7520 * 7521 * @param canvas the canvas on which to draw the scrollbar 7522 * @param scrollBar the scrollbar's drawable 7523 * 7524 * @see #isVerticalScrollBarEnabled() 7525 * @see #computeVerticalScrollRange() 7526 * @see #computeVerticalScrollExtent() 7527 * @see #computeVerticalScrollOffset() 7528 * @see android.widget.ScrollBarDrawable 7529 * @hide 7530 */ 7531 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 7532 int l, int t, int r, int b) { 7533 scrollBar.setBounds(l, t, r, b); 7534 scrollBar.draw(canvas); 7535 } 7536 7537 /** 7538 * Implement this to do your drawing. 7539 * 7540 * @param canvas the canvas on which the background will be drawn 7541 */ 7542 protected void onDraw(Canvas canvas) { 7543 } 7544 7545 /* 7546 * Caller is responsible for calling requestLayout if necessary. 7547 * (This allows addViewInLayout to not request a new layout.) 7548 */ 7549 void assignParent(ViewParent parent) { 7550 if (mParent == null) { 7551 mParent = parent; 7552 } else if (parent == null) { 7553 mParent = null; 7554 } else { 7555 throw new RuntimeException("view " + this + " being added, but" 7556 + " it already has a parent"); 7557 } 7558 } 7559 7560 /** 7561 * This is called when the view is attached to a window. At this point it 7562 * has a Surface and will start drawing. Note that this function is 7563 * guaranteed to be called before {@link #onDraw}, however it may be called 7564 * any time before the first onDraw -- including before or after 7565 * {@link #onMeasure}. 7566 * 7567 * @see #onDetachedFromWindow() 7568 */ 7569 protected void onAttachedToWindow() { 7570 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 7571 mParent.requestTransparentRegion(this); 7572 } 7573 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 7574 initialAwakenScrollBars(); 7575 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 7576 } 7577 jumpDrawablesToCurrentState(); 7578 } 7579 7580 /** 7581 * This is called when the view is detached from a window. At this point it 7582 * no longer has a surface for drawing. 7583 * 7584 * @see #onAttachedToWindow() 7585 */ 7586 protected void onDetachedFromWindow() { 7587 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 7588 7589 removeUnsetPressCallback(); 7590 removeLongPressCallback(); 7591 removePerformClickCallback(); 7592 7593 destroyDrawingCache(); 7594 7595 if (mHardwareLayer != null) { 7596 mHardwareLayer.destroy(); 7597 mHardwareLayer = null; 7598 } 7599 7600 if (mAttachInfo != null) { 7601 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 7602 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_RECT_MSG, this); 7603 } 7604 7605 mCurrentAnimation = null; 7606 } 7607 7608 /** 7609 * @return The number of times this view has been attached to a window 7610 */ 7611 protected int getWindowAttachCount() { 7612 return mWindowAttachCount; 7613 } 7614 7615 /** 7616 * Retrieve a unique token identifying the window this view is attached to. 7617 * @return Return the window's token for use in 7618 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 7619 */ 7620 public IBinder getWindowToken() { 7621 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 7622 } 7623 7624 /** 7625 * Retrieve a unique token identifying the top-level "real" window of 7626 * the window that this view is attached to. That is, this is like 7627 * {@link #getWindowToken}, except if the window this view in is a panel 7628 * window (attached to another containing window), then the token of 7629 * the containing window is returned instead. 7630 * 7631 * @return Returns the associated window token, either 7632 * {@link #getWindowToken()} or the containing window's token. 7633 */ 7634 public IBinder getApplicationWindowToken() { 7635 AttachInfo ai = mAttachInfo; 7636 if (ai != null) { 7637 IBinder appWindowToken = ai.mPanelParentWindowToken; 7638 if (appWindowToken == null) { 7639 appWindowToken = ai.mWindowToken; 7640 } 7641 return appWindowToken; 7642 } 7643 return null; 7644 } 7645 7646 /** 7647 * Retrieve private session object this view hierarchy is using to 7648 * communicate with the window manager. 7649 * @return the session object to communicate with the window manager 7650 */ 7651 /*package*/ IWindowSession getWindowSession() { 7652 return mAttachInfo != null ? mAttachInfo.mSession : null; 7653 } 7654 7655 /** 7656 * @param info the {@link android.view.View.AttachInfo} to associated with 7657 * this view 7658 */ 7659 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 7660 //System.out.println("Attached! " + this); 7661 mAttachInfo = info; 7662 mWindowAttachCount++; 7663 // We will need to evaluate the drawable state at least once. 7664 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 7665 if (mFloatingTreeObserver != null) { 7666 info.mTreeObserver.merge(mFloatingTreeObserver); 7667 mFloatingTreeObserver = null; 7668 } 7669 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 7670 mAttachInfo.mScrollContainers.add(this); 7671 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 7672 } 7673 performCollectViewAttributes(visibility); 7674 onAttachedToWindow(); 7675 int vis = info.mWindowVisibility; 7676 if (vis != GONE) { 7677 onWindowVisibilityChanged(vis); 7678 } 7679 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 7680 // If nobody has evaluated the drawable state yet, then do it now. 7681 refreshDrawableState(); 7682 } 7683 } 7684 7685 void dispatchDetachedFromWindow() { 7686 //System.out.println("Detached! " + this); 7687 AttachInfo info = mAttachInfo; 7688 if (info != null) { 7689 int vis = info.mWindowVisibility; 7690 if (vis != GONE) { 7691 onWindowVisibilityChanged(GONE); 7692 } 7693 } 7694 7695 onDetachedFromWindow(); 7696 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 7697 mAttachInfo.mScrollContainers.remove(this); 7698 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 7699 } 7700 mAttachInfo = null; 7701 } 7702 7703 /** 7704 * Store this view hierarchy's frozen state into the given container. 7705 * 7706 * @param container The SparseArray in which to save the view's state. 7707 * 7708 * @see #restoreHierarchyState 7709 * @see #dispatchSaveInstanceState 7710 * @see #onSaveInstanceState 7711 */ 7712 public void saveHierarchyState(SparseArray<Parcelable> container) { 7713 dispatchSaveInstanceState(container); 7714 } 7715 7716 /** 7717 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 7718 * May be overridden to modify how freezing happens to a view's children; for example, some 7719 * views may want to not store state for their children. 7720 * 7721 * @param container The SparseArray in which to save the view's state. 7722 * 7723 * @see #dispatchRestoreInstanceState 7724 * @see #saveHierarchyState 7725 * @see #onSaveInstanceState 7726 */ 7727 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 7728 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 7729 mPrivateFlags &= ~SAVE_STATE_CALLED; 7730 Parcelable state = onSaveInstanceState(); 7731 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7732 throw new IllegalStateException( 7733 "Derived class did not call super.onSaveInstanceState()"); 7734 } 7735 if (state != null) { 7736 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 7737 // + ": " + state); 7738 container.put(mID, state); 7739 } 7740 } 7741 } 7742 7743 /** 7744 * Hook allowing a view to generate a representation of its internal state 7745 * that can later be used to create a new instance with that same state. 7746 * This state should only contain information that is not persistent or can 7747 * not be reconstructed later. For example, you will never store your 7748 * current position on screen because that will be computed again when a 7749 * new instance of the view is placed in its view hierarchy. 7750 * <p> 7751 * Some examples of things you may store here: the current cursor position 7752 * in a text view (but usually not the text itself since that is stored in a 7753 * content provider or other persistent storage), the currently selected 7754 * item in a list view. 7755 * 7756 * @return Returns a Parcelable object containing the view's current dynamic 7757 * state, or null if there is nothing interesting to save. The 7758 * default implementation returns null. 7759 * @see #onRestoreInstanceState 7760 * @see #saveHierarchyState 7761 * @see #dispatchSaveInstanceState 7762 * @see #setSaveEnabled(boolean) 7763 */ 7764 protected Parcelable onSaveInstanceState() { 7765 mPrivateFlags |= SAVE_STATE_CALLED; 7766 return BaseSavedState.EMPTY_STATE; 7767 } 7768 7769 /** 7770 * Restore this view hierarchy's frozen state from the given container. 7771 * 7772 * @param container The SparseArray which holds previously frozen states. 7773 * 7774 * @see #saveHierarchyState 7775 * @see #dispatchRestoreInstanceState 7776 * @see #onRestoreInstanceState 7777 */ 7778 public void restoreHierarchyState(SparseArray<Parcelable> container) { 7779 dispatchRestoreInstanceState(container); 7780 } 7781 7782 /** 7783 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 7784 * children. May be overridden to modify how restoreing happens to a view's children; for 7785 * example, some views may want to not store state for their children. 7786 * 7787 * @param container The SparseArray which holds previously saved state. 7788 * 7789 * @see #dispatchSaveInstanceState 7790 * @see #restoreHierarchyState 7791 * @see #onRestoreInstanceState 7792 */ 7793 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 7794 if (mID != NO_ID) { 7795 Parcelable state = container.get(mID); 7796 if (state != null) { 7797 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 7798 // + ": " + state); 7799 mPrivateFlags &= ~SAVE_STATE_CALLED; 7800 onRestoreInstanceState(state); 7801 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7802 throw new IllegalStateException( 7803 "Derived class did not call super.onRestoreInstanceState()"); 7804 } 7805 } 7806 } 7807 } 7808 7809 /** 7810 * Hook allowing a view to re-apply a representation of its internal state that had previously 7811 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 7812 * null state. 7813 * 7814 * @param state The frozen state that had previously been returned by 7815 * {@link #onSaveInstanceState}. 7816 * 7817 * @see #onSaveInstanceState 7818 * @see #restoreHierarchyState 7819 * @see #dispatchRestoreInstanceState 7820 */ 7821 protected void onRestoreInstanceState(Parcelable state) { 7822 mPrivateFlags |= SAVE_STATE_CALLED; 7823 if (state != BaseSavedState.EMPTY_STATE && state != null) { 7824 throw new IllegalArgumentException("Wrong state class, expecting View State but " 7825 + "received " + state.getClass().toString() + " instead. This usually happens " 7826 + "when two views of different type have the same id in the same hierarchy. " 7827 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 7828 + "other views do not use the same id."); 7829 } 7830 } 7831 7832 /** 7833 * <p>Return the time at which the drawing of the view hierarchy started.</p> 7834 * 7835 * @return the drawing start time in milliseconds 7836 */ 7837 public long getDrawingTime() { 7838 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 7839 } 7840 7841 /** 7842 * <p>Enables or disables the duplication of the parent's state into this view. When 7843 * duplication is enabled, this view gets its drawable state from its parent rather 7844 * than from its own internal properties.</p> 7845 * 7846 * <p>Note: in the current implementation, setting this property to true after the 7847 * view was added to a ViewGroup might have no effect at all. This property should 7848 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 7849 * 7850 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 7851 * property is enabled, an exception will be thrown.</p> 7852 * 7853 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 7854 * parent, these states should not be affected by this method.</p> 7855 * 7856 * @param enabled True to enable duplication of the parent's drawable state, false 7857 * to disable it. 7858 * 7859 * @see #getDrawableState() 7860 * @see #isDuplicateParentStateEnabled() 7861 */ 7862 public void setDuplicateParentStateEnabled(boolean enabled) { 7863 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 7864 } 7865 7866 /** 7867 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 7868 * 7869 * @return True if this view's drawable state is duplicated from the parent, 7870 * false otherwise 7871 * 7872 * @see #getDrawableState() 7873 * @see #setDuplicateParentStateEnabled(boolean) 7874 */ 7875 public boolean isDuplicateParentStateEnabled() { 7876 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 7877 } 7878 7879 /** 7880 * <p>Specifies the type of layer backing this view. The layer can be 7881 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 7882 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 7883 * 7884 * <p>A layer is associated with an optional {@link android.graphics.Paint} 7885 * instance that controls how the layer is composed on screen. The following 7886 * properties of the paint are taken into account when composing the layer:</p> 7887 * <ul> 7888 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 7889 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 7890 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 7891 * </ul> 7892 * 7893 * <p>If this view has an alpha value set to < 1.0 by calling 7894 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 7895 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 7896 * equivalent to setting a hardware layer on this view and providing a paint with 7897 * the desired alpha value.<p> 7898 * 7899 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 7900 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 7901 * for more information on when and how to use layers.</p> 7902 * 7903 * @param layerType The ype of layer to use with this view, must be one of 7904 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7905 * {@link #LAYER_TYPE_HARDWARE} 7906 * @param paint The paint used to compose the layer. This argument is optional 7907 * and can be null. It is ignored when the layer type is 7908 * {@link #LAYER_TYPE_NONE} 7909 * 7910 * @see #getLayerType() 7911 * @see #LAYER_TYPE_NONE 7912 * @see #LAYER_TYPE_SOFTWARE 7913 * @see #LAYER_TYPE_HARDWARE 7914 * @see #setAlpha(float) 7915 * 7916 * @attr ref android.R.styleable#View_layerType 7917 */ 7918 public void setLayerType(int layerType, Paint paint) { 7919 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 7920 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 7921 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 7922 } 7923 7924 if (layerType == mLayerType) { 7925 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 7926 mLayerPaint = paint == null ? new Paint() : paint; 7927 if (mParent instanceof ViewGroup) { 7928 ((ViewGroup) mParent).invalidate(); 7929 } 7930 invalidate(); 7931 } 7932 return; 7933 } 7934 7935 // Destroy any previous software drawing cache if needed 7936 switch (mLayerType) { 7937 case LAYER_TYPE_SOFTWARE: 7938 if (mDrawingCache != null) { 7939 mDrawingCache.recycle(); 7940 mDrawingCache = null; 7941 } 7942 7943 if (mUnscaledDrawingCache != null) { 7944 mUnscaledDrawingCache.recycle(); 7945 mUnscaledDrawingCache = null; 7946 } 7947 break; 7948 case LAYER_TYPE_HARDWARE: 7949 if (mHardwareLayer != null) { 7950 mHardwareLayer.destroy(); 7951 mHardwareLayer = null; 7952 } 7953 break; 7954 default: 7955 break; 7956 } 7957 7958 mLayerType = layerType; 7959 mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : (paint == null ? new Paint() : paint); 7960 7961 if (mParent instanceof ViewGroup) { 7962 ((ViewGroup) mParent).invalidate(); 7963 } 7964 invalidate(); 7965 } 7966 7967 /** 7968 * Indicates what type of layer is currently associated with this view. By default 7969 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 7970 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 7971 * for more information on the different types of layers. 7972 * 7973 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7974 * {@link #LAYER_TYPE_HARDWARE} 7975 * 7976 * @see #setLayerType(int, android.graphics.Paint) 7977 * @see #LAYER_TYPE_NONE 7978 * @see #LAYER_TYPE_SOFTWARE 7979 * @see #LAYER_TYPE_HARDWARE 7980 */ 7981 public int getLayerType() { 7982 return mLayerType; 7983 } 7984 7985 /** 7986 * <p>Returns a hardware layer that can be used to draw this view again 7987 * without executing its draw method.</p> 7988 * 7989 * @return A HardwareLayer ready to render, or null if an error occurred. 7990 */ 7991 HardwareLayer getHardwareLayer(Canvas currentCanvas) { 7992 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 7993 return null; 7994 } 7995 7996 final int width = mRight - mLeft; 7997 final int height = mBottom - mTop; 7998 7999 if (width == 0 || height == 0) { 8000 return null; 8001 } 8002 8003 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 8004 if (mHardwareLayer == null) { 8005 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 8006 width, height, isOpaque()); 8007 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 8008 mHardwareLayer.resize(width, height); 8009 } 8010 8011 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 8012 try { 8013 canvas.setViewport(width, height); 8014 canvas.onPreDraw(); 8015 8016 computeScroll(); 8017 canvas.translate(-mScrollX, -mScrollY); 8018 8019 final int restoreCount = canvas.save(); 8020 8021 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8022 8023 // Fast path for layouts with no backgrounds 8024 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8025 mPrivateFlags &= ~DIRTY_MASK; 8026 dispatchDraw(canvas); 8027 } else { 8028 draw(canvas); 8029 } 8030 8031 canvas.restoreToCount(restoreCount); 8032 } finally { 8033 canvas.onPostDraw(); 8034 mHardwareLayer.end(currentCanvas); 8035 } 8036 } 8037 8038 return mHardwareLayer; 8039 } 8040 8041 /** 8042 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 8043 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 8044 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 8045 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 8046 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 8047 * null.</p> 8048 * 8049 * <p>Enabling the drawing cache is similar to 8050 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 8051 * acceleration is turned off. When hardware acceleration is turned on enabling the 8052 * drawing cache has either no effect or the cache used at drawing time is not a bitmap. 8053 * This API can however be used to manually generate a bitmap copy of this view.</p> 8054 * 8055 * @param enabled true to enable the drawing cache, false otherwise 8056 * 8057 * @see #isDrawingCacheEnabled() 8058 * @see #getDrawingCache() 8059 * @see #buildDrawingCache() 8060 * @see #setLayerType(int, android.graphics.Paint) 8061 */ 8062 public void setDrawingCacheEnabled(boolean enabled) { 8063 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 8064 } 8065 8066 /** 8067 * <p>Indicates whether the drawing cache is enabled for this view.</p> 8068 * 8069 * @return true if the drawing cache is enabled 8070 * 8071 * @see #setDrawingCacheEnabled(boolean) 8072 * @see #getDrawingCache() 8073 */ 8074 @ViewDebug.ExportedProperty(category = "drawing") 8075 public boolean isDrawingCacheEnabled() { 8076 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 8077 } 8078 8079 /** 8080 * <p>Returns a display list that can be used to draw this view again 8081 * without executing its draw method.</p> 8082 * 8083 * @return A DisplayList ready to replay, or null if caching is not enabled. 8084 */ 8085 DisplayList getDisplayList() { 8086 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8087 return null; 8088 } 8089 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8090 return null; 8091 } 8092 8093 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED && 8094 ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 8095 mDisplayList == null || !mDisplayList.isValid())) { 8096 8097 if (mDisplayList == null) { 8098 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 8099 } 8100 8101 final HardwareCanvas canvas = mDisplayList.start(); 8102 try { 8103 int width = mRight - mLeft; 8104 int height = mBottom - mTop; 8105 8106 canvas.setViewport(width, height); 8107 canvas.onPreDraw(); 8108 8109 final int restoreCount = canvas.save(); 8110 8111 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8112 8113 // Fast path for layouts with no backgrounds 8114 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8115 mPrivateFlags &= ~DIRTY_MASK; 8116 dispatchDraw(canvas); 8117 } else { 8118 draw(canvas); 8119 } 8120 8121 canvas.restoreToCount(restoreCount); 8122 } finally { 8123 canvas.onPostDraw(); 8124 8125 mDisplayList.end(); 8126 } 8127 } 8128 8129 return mDisplayList; 8130 } 8131 8132 /** 8133 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 8134 * 8135 * @return A non-scaled bitmap representing this view or null if cache is disabled. 8136 * 8137 * @see #getDrawingCache(boolean) 8138 */ 8139 public Bitmap getDrawingCache() { 8140 return getDrawingCache(false); 8141 } 8142 8143 /** 8144 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 8145 * is null when caching is disabled. If caching is enabled and the cache is not ready, 8146 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 8147 * draw from the cache when the cache is enabled. To benefit from the cache, you must 8148 * request the drawing cache by calling this method and draw it on screen if the 8149 * returned bitmap is not null.</p> 8150 * 8151 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8152 * this method will create a bitmap of the same size as this view. Because this bitmap 8153 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8154 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8155 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8156 * size than the view. This implies that your application must be able to handle this 8157 * size.</p> 8158 * 8159 * @param autoScale Indicates whether the generated bitmap should be scaled based on 8160 * the current density of the screen when the application is in compatibility 8161 * mode. 8162 * 8163 * @return A bitmap representing this view or null if cache is disabled. 8164 * 8165 * @see #setDrawingCacheEnabled(boolean) 8166 * @see #isDrawingCacheEnabled() 8167 * @see #buildDrawingCache(boolean) 8168 * @see #destroyDrawingCache() 8169 */ 8170 public Bitmap getDrawingCache(boolean autoScale) { 8171 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8172 return null; 8173 } 8174 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 8175 buildDrawingCache(autoScale); 8176 } 8177 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 8178 } 8179 8180 /** 8181 * <p>Frees the resources used by the drawing cache. If you call 8182 * {@link #buildDrawingCache()} manually without calling 8183 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8184 * should cleanup the cache with this method afterwards.</p> 8185 * 8186 * @see #setDrawingCacheEnabled(boolean) 8187 * @see #buildDrawingCache() 8188 * @see #getDrawingCache() 8189 */ 8190 public void destroyDrawingCache() { 8191 if (mDrawingCache != null) { 8192 mDrawingCache.recycle(); 8193 mDrawingCache = null; 8194 } 8195 if (mUnscaledDrawingCache != null) { 8196 mUnscaledDrawingCache.recycle(); 8197 mUnscaledDrawingCache = null; 8198 } 8199 if (mDisplayList != null) { 8200 mDisplayList.invalidate(); 8201 } 8202 } 8203 8204 /** 8205 * Setting a solid background color for the drawing cache's bitmaps will improve 8206 * perfromance and memory usage. Note, though that this should only be used if this 8207 * view will always be drawn on top of a solid color. 8208 * 8209 * @param color The background color to use for the drawing cache's bitmap 8210 * 8211 * @see #setDrawingCacheEnabled(boolean) 8212 * @see #buildDrawingCache() 8213 * @see #getDrawingCache() 8214 */ 8215 public void setDrawingCacheBackgroundColor(int color) { 8216 if (color != mDrawingCacheBackgroundColor) { 8217 mDrawingCacheBackgroundColor = color; 8218 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8219 } 8220 } 8221 8222 /** 8223 * @see #setDrawingCacheBackgroundColor(int) 8224 * 8225 * @return The background color to used for the drawing cache's bitmap 8226 */ 8227 public int getDrawingCacheBackgroundColor() { 8228 return mDrawingCacheBackgroundColor; 8229 } 8230 8231 /** 8232 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 8233 * 8234 * @see #buildDrawingCache(boolean) 8235 */ 8236 public void buildDrawingCache() { 8237 buildDrawingCache(false); 8238 } 8239 8240 /** 8241 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 8242 * 8243 * <p>If you call {@link #buildDrawingCache()} manually without calling 8244 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8245 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 8246 * 8247 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8248 * this method will create a bitmap of the same size as this view. Because this bitmap 8249 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8250 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8251 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8252 * size than the view. This implies that your application must be able to handle this 8253 * size.</p> 8254 * 8255 * <p>You should avoid calling this method when hardware acceleration is enabled. If 8256 * you do not need the drawing cache bitmap, calling this method will increase memory 8257 * usage and cause the view to be rendered in software once, thus negatively impacting 8258 * performance.</p> 8259 * 8260 * @see #getDrawingCache() 8261 * @see #destroyDrawingCache() 8262 */ 8263 public void buildDrawingCache(boolean autoScale) { 8264 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 8265 mDrawingCache == null : mUnscaledDrawingCache == null)) { 8266 8267 if (ViewDebug.TRACE_HIERARCHY) { 8268 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 8269 } 8270 8271 int width = mRight - mLeft; 8272 int height = mBottom - mTop; 8273 8274 final AttachInfo attachInfo = mAttachInfo; 8275 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 8276 8277 if (autoScale && scalingRequired) { 8278 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 8279 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 8280 } 8281 8282 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 8283 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 8284 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 8285 8286 if (width <= 0 || height <= 0 || 8287 // Projected bitmap size in bytes 8288 (width * height * (opaque && !use32BitCache ? 2 : 4) > 8289 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 8290 destroyDrawingCache(); 8291 return; 8292 } 8293 8294 boolean clear = true; 8295 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 8296 8297 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 8298 Bitmap.Config quality; 8299 if (!opaque) { 8300 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 8301 case DRAWING_CACHE_QUALITY_AUTO: 8302 quality = Bitmap.Config.ARGB_8888; 8303 break; 8304 case DRAWING_CACHE_QUALITY_LOW: 8305 quality = Bitmap.Config.ARGB_4444; 8306 break; 8307 case DRAWING_CACHE_QUALITY_HIGH: 8308 quality = Bitmap.Config.ARGB_8888; 8309 break; 8310 default: 8311 quality = Bitmap.Config.ARGB_8888; 8312 break; 8313 } 8314 } else { 8315 // Optimization for translucent windows 8316 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 8317 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 8318 } 8319 8320 // Try to cleanup memory 8321 if (bitmap != null) bitmap.recycle(); 8322 8323 try { 8324 bitmap = Bitmap.createBitmap(width, height, quality); 8325 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8326 if (autoScale) { 8327 mDrawingCache = bitmap; 8328 } else { 8329 mUnscaledDrawingCache = bitmap; 8330 } 8331 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 8332 } catch (OutOfMemoryError e) { 8333 // If there is not enough memory to create the bitmap cache, just 8334 // ignore the issue as bitmap caches are not required to draw the 8335 // view hierarchy 8336 if (autoScale) { 8337 mDrawingCache = null; 8338 } else { 8339 mUnscaledDrawingCache = null; 8340 } 8341 return; 8342 } 8343 8344 clear = drawingCacheBackgroundColor != 0; 8345 } 8346 8347 Canvas canvas; 8348 if (attachInfo != null) { 8349 canvas = attachInfo.mCanvas; 8350 if (canvas == null) { 8351 canvas = new Canvas(); 8352 } 8353 canvas.setBitmap(bitmap); 8354 // Temporarily clobber the cached Canvas in case one of our children 8355 // is also using a drawing cache. Without this, the children would 8356 // steal the canvas by attaching their own bitmap to it and bad, bad 8357 // thing would happen (invisible views, corrupted drawings, etc.) 8358 attachInfo.mCanvas = null; 8359 } else { 8360 // This case should hopefully never or seldom happen 8361 canvas = new Canvas(bitmap); 8362 } 8363 8364 if (clear) { 8365 bitmap.eraseColor(drawingCacheBackgroundColor); 8366 } 8367 8368 computeScroll(); 8369 final int restoreCount = canvas.save(); 8370 8371 if (autoScale && scalingRequired) { 8372 final float scale = attachInfo.mApplicationScale; 8373 canvas.scale(scale, scale); 8374 } 8375 8376 canvas.translate(-mScrollX, -mScrollY); 8377 8378 mPrivateFlags |= DRAWN; 8379 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 8380 mLayerType != LAYER_TYPE_NONE) { 8381 mPrivateFlags |= DRAWING_CACHE_VALID; 8382 } 8383 8384 // Fast path for layouts with no backgrounds 8385 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8386 if (ViewDebug.TRACE_HIERARCHY) { 8387 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8388 } 8389 mPrivateFlags &= ~DIRTY_MASK; 8390 dispatchDraw(canvas); 8391 } else { 8392 draw(canvas); 8393 } 8394 8395 canvas.restoreToCount(restoreCount); 8396 8397 if (attachInfo != null) { 8398 // Restore the cached Canvas for our siblings 8399 attachInfo.mCanvas = canvas; 8400 } 8401 } 8402 } 8403 8404 /** 8405 * Create a snapshot of the view into a bitmap. We should probably make 8406 * some form of this public, but should think about the API. 8407 */ 8408 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 8409 int width = mRight - mLeft; 8410 int height = mBottom - mTop; 8411 8412 final AttachInfo attachInfo = mAttachInfo; 8413 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 8414 width = (int) ((width * scale) + 0.5f); 8415 height = (int) ((height * scale) + 0.5f); 8416 8417 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 8418 if (bitmap == null) { 8419 throw new OutOfMemoryError(); 8420 } 8421 8422 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8423 8424 Canvas canvas; 8425 if (attachInfo != null) { 8426 canvas = attachInfo.mCanvas; 8427 if (canvas == null) { 8428 canvas = new Canvas(); 8429 } 8430 canvas.setBitmap(bitmap); 8431 // Temporarily clobber the cached Canvas in case one of our children 8432 // is also using a drawing cache. Without this, the children would 8433 // steal the canvas by attaching their own bitmap to it and bad, bad 8434 // things would happen (invisible views, corrupted drawings, etc.) 8435 attachInfo.mCanvas = null; 8436 } else { 8437 // This case should hopefully never or seldom happen 8438 canvas = new Canvas(bitmap); 8439 } 8440 8441 if ((backgroundColor & 0xff000000) != 0) { 8442 bitmap.eraseColor(backgroundColor); 8443 } 8444 8445 computeScroll(); 8446 final int restoreCount = canvas.save(); 8447 canvas.scale(scale, scale); 8448 canvas.translate(-mScrollX, -mScrollY); 8449 8450 // Temporarily remove the dirty mask 8451 int flags = mPrivateFlags; 8452 mPrivateFlags &= ~DIRTY_MASK; 8453 8454 // Fast path for layouts with no backgrounds 8455 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8456 dispatchDraw(canvas); 8457 } else { 8458 draw(canvas); 8459 } 8460 8461 mPrivateFlags = flags; 8462 8463 canvas.restoreToCount(restoreCount); 8464 8465 if (attachInfo != null) { 8466 // Restore the cached Canvas for our siblings 8467 attachInfo.mCanvas = canvas; 8468 } 8469 8470 return bitmap; 8471 } 8472 8473 /** 8474 * Indicates whether this View is currently in edit mode. A View is usually 8475 * in edit mode when displayed within a developer tool. For instance, if 8476 * this View is being drawn by a visual user interface builder, this method 8477 * should return true. 8478 * 8479 * Subclasses should check the return value of this method to provide 8480 * different behaviors if their normal behavior might interfere with the 8481 * host environment. For instance: the class spawns a thread in its 8482 * constructor, the drawing code relies on device-specific features, etc. 8483 * 8484 * This method is usually checked in the drawing code of custom widgets. 8485 * 8486 * @return True if this View is in edit mode, false otherwise. 8487 */ 8488 public boolean isInEditMode() { 8489 return false; 8490 } 8491 8492 /** 8493 * If the View draws content inside its padding and enables fading edges, 8494 * it needs to support padding offsets. Padding offsets are added to the 8495 * fading edges to extend the length of the fade so that it covers pixels 8496 * drawn inside the padding. 8497 * 8498 * Subclasses of this class should override this method if they need 8499 * to draw content inside the padding. 8500 * 8501 * @return True if padding offset must be applied, false otherwise. 8502 * 8503 * @see #getLeftPaddingOffset() 8504 * @see #getRightPaddingOffset() 8505 * @see #getTopPaddingOffset() 8506 * @see #getBottomPaddingOffset() 8507 * 8508 * @since CURRENT 8509 */ 8510 protected boolean isPaddingOffsetRequired() { 8511 return false; 8512 } 8513 8514 /** 8515 * Amount by which to extend the left fading region. Called only when 8516 * {@link #isPaddingOffsetRequired()} returns true. 8517 * 8518 * @return The left padding offset in pixels. 8519 * 8520 * @see #isPaddingOffsetRequired() 8521 * 8522 * @since CURRENT 8523 */ 8524 protected int getLeftPaddingOffset() { 8525 return 0; 8526 } 8527 8528 /** 8529 * Amount by which to extend the right fading region. Called only when 8530 * {@link #isPaddingOffsetRequired()} returns true. 8531 * 8532 * @return The right padding offset in pixels. 8533 * 8534 * @see #isPaddingOffsetRequired() 8535 * 8536 * @since CURRENT 8537 */ 8538 protected int getRightPaddingOffset() { 8539 return 0; 8540 } 8541 8542 /** 8543 * Amount by which to extend the top fading region. Called only when 8544 * {@link #isPaddingOffsetRequired()} returns true. 8545 * 8546 * @return The top padding offset in pixels. 8547 * 8548 * @see #isPaddingOffsetRequired() 8549 * 8550 * @since CURRENT 8551 */ 8552 protected int getTopPaddingOffset() { 8553 return 0; 8554 } 8555 8556 /** 8557 * Amount by which to extend the bottom fading region. Called only when 8558 * {@link #isPaddingOffsetRequired()} returns true. 8559 * 8560 * @return The bottom padding offset in pixels. 8561 * 8562 * @see #isPaddingOffsetRequired() 8563 * 8564 * @since CURRENT 8565 */ 8566 protected int getBottomPaddingOffset() { 8567 return 0; 8568 } 8569 8570 /** 8571 * <p>Indicates whether this view is attached to an hardware accelerated 8572 * window or not.</p> 8573 * 8574 * <p>Even if this method returns true, it does not mean that every call 8575 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 8576 * accelerated {@link android.graphics.Canvas}. For instance, if this view 8577 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 8578 * window is hardware accelerated, 8579 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 8580 * return false, and this method will return true.</p> 8581 * 8582 * @return True if the view is attached to a window and the window is 8583 * hardware accelerated; false in any other case. 8584 */ 8585 public boolean isHardwareAccelerated() { 8586 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 8587 } 8588 8589 /** 8590 * Manually render this view (and all of its children) to the given Canvas. 8591 * The view must have already done a full layout before this function is 8592 * called. When implementing a view, implement {@link #onDraw} instead of 8593 * overriding this method. If you do need to override this method, call 8594 * the superclass version. 8595 * 8596 * @param canvas The Canvas to which the View is rendered. 8597 */ 8598 public void draw(Canvas canvas) { 8599 if (ViewDebug.TRACE_HIERARCHY) { 8600 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8601 } 8602 8603 final int privateFlags = mPrivateFlags; 8604 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 8605 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 8606 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 8607 8608 /* 8609 * Draw traversal performs several drawing steps which must be executed 8610 * in the appropriate order: 8611 * 8612 * 1. Draw the background 8613 * 2. If necessary, save the canvas' layers to prepare for fading 8614 * 3. Draw view's content 8615 * 4. Draw children 8616 * 5. If necessary, draw the fading edges and restore layers 8617 * 6. Draw decorations (scrollbars for instance) 8618 */ 8619 8620 // Step 1, draw the background, if needed 8621 int saveCount; 8622 8623 if (!dirtyOpaque) { 8624 final Drawable background = mBGDrawable; 8625 if (background != null) { 8626 final int scrollX = mScrollX; 8627 final int scrollY = mScrollY; 8628 8629 if (mBackgroundSizeChanged) { 8630 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 8631 mBackgroundSizeChanged = false; 8632 } 8633 8634 if ((scrollX | scrollY) == 0) { 8635 background.draw(canvas); 8636 } else { 8637 canvas.translate(scrollX, scrollY); 8638 background.draw(canvas); 8639 canvas.translate(-scrollX, -scrollY); 8640 } 8641 } 8642 } 8643 8644 // skip step 2 & 5 if possible (common case) 8645 final int viewFlags = mViewFlags; 8646 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 8647 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 8648 if (!verticalEdges && !horizontalEdges) { 8649 // Step 3, draw the content 8650 if (!dirtyOpaque) onDraw(canvas); 8651 8652 // Step 4, draw the children 8653 dispatchDraw(canvas); 8654 8655 // Step 6, draw decorations (scrollbars) 8656 onDrawScrollBars(canvas); 8657 8658 // we're done... 8659 return; 8660 } 8661 8662 /* 8663 * Here we do the full fledged routine... 8664 * (this is an uncommon case where speed matters less, 8665 * this is why we repeat some of the tests that have been 8666 * done above) 8667 */ 8668 8669 boolean drawTop = false; 8670 boolean drawBottom = false; 8671 boolean drawLeft = false; 8672 boolean drawRight = false; 8673 8674 float topFadeStrength = 0.0f; 8675 float bottomFadeStrength = 0.0f; 8676 float leftFadeStrength = 0.0f; 8677 float rightFadeStrength = 0.0f; 8678 8679 // Step 2, save the canvas' layers 8680 int paddingLeft = mPaddingLeft; 8681 int paddingTop = mPaddingTop; 8682 8683 final boolean offsetRequired = isPaddingOffsetRequired(); 8684 if (offsetRequired) { 8685 paddingLeft += getLeftPaddingOffset(); 8686 paddingTop += getTopPaddingOffset(); 8687 } 8688 8689 int left = mScrollX + paddingLeft; 8690 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 8691 int top = mScrollY + paddingTop; 8692 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 8693 8694 if (offsetRequired) { 8695 right += getRightPaddingOffset(); 8696 bottom += getBottomPaddingOffset(); 8697 } 8698 8699 final ScrollabilityCache scrollabilityCache = mScrollCache; 8700 int length = scrollabilityCache.fadingEdgeLength; 8701 8702 // clip the fade length if top and bottom fades overlap 8703 // overlapping fades produce odd-looking artifacts 8704 if (verticalEdges && (top + length > bottom - length)) { 8705 length = (bottom - top) / 2; 8706 } 8707 8708 // also clip horizontal fades if necessary 8709 if (horizontalEdges && (left + length > right - length)) { 8710 length = (right - left) / 2; 8711 } 8712 8713 if (verticalEdges) { 8714 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 8715 drawTop = topFadeStrength > 0.0f; 8716 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 8717 drawBottom = bottomFadeStrength > 0.0f; 8718 } 8719 8720 if (horizontalEdges) { 8721 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 8722 drawLeft = leftFadeStrength > 0.0f; 8723 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 8724 drawRight = rightFadeStrength > 0.0f; 8725 } 8726 8727 saveCount = canvas.getSaveCount(); 8728 8729 int solidColor = getSolidColor(); 8730 if (solidColor == 0) { 8731 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 8732 8733 if (drawTop) { 8734 canvas.saveLayer(left, top, right, top + length, null, flags); 8735 } 8736 8737 if (drawBottom) { 8738 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 8739 } 8740 8741 if (drawLeft) { 8742 canvas.saveLayer(left, top, left + length, bottom, null, flags); 8743 } 8744 8745 if (drawRight) { 8746 canvas.saveLayer(right - length, top, right, bottom, null, flags); 8747 } 8748 } else { 8749 scrollabilityCache.setFadeColor(solidColor); 8750 } 8751 8752 // Step 3, draw the content 8753 if (!dirtyOpaque) onDraw(canvas); 8754 8755 // Step 4, draw the children 8756 dispatchDraw(canvas); 8757 8758 // Step 5, draw the fade effect and restore layers 8759 final Paint p = scrollabilityCache.paint; 8760 final Matrix matrix = scrollabilityCache.matrix; 8761 final Shader fade = scrollabilityCache.shader; 8762 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 8763 8764 if (drawTop) { 8765 matrix.setScale(1, fadeHeight * topFadeStrength); 8766 matrix.postTranslate(left, top); 8767 fade.setLocalMatrix(matrix); 8768 canvas.drawRect(left, top, right, top + length, p); 8769 } 8770 8771 if (drawBottom) { 8772 matrix.setScale(1, fadeHeight * bottomFadeStrength); 8773 matrix.postRotate(180); 8774 matrix.postTranslate(left, bottom); 8775 fade.setLocalMatrix(matrix); 8776 canvas.drawRect(left, bottom - length, right, bottom, p); 8777 } 8778 8779 if (drawLeft) { 8780 matrix.setScale(1, fadeHeight * leftFadeStrength); 8781 matrix.postRotate(-90); 8782 matrix.postTranslate(left, top); 8783 fade.setLocalMatrix(matrix); 8784 canvas.drawRect(left, top, left + length, bottom, p); 8785 } 8786 8787 if (drawRight) { 8788 matrix.setScale(1, fadeHeight * rightFadeStrength); 8789 matrix.postRotate(90); 8790 matrix.postTranslate(right, top); 8791 fade.setLocalMatrix(matrix); 8792 canvas.drawRect(right - length, top, right, bottom, p); 8793 } 8794 8795 canvas.restoreToCount(saveCount); 8796 8797 // Step 6, draw decorations (scrollbars) 8798 onDrawScrollBars(canvas); 8799 } 8800 8801 /** 8802 * Override this if your view is known to always be drawn on top of a solid color background, 8803 * and needs to draw fading edges. Returning a non-zero color enables the view system to 8804 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 8805 * should be set to 0xFF. 8806 * 8807 * @see #setVerticalFadingEdgeEnabled 8808 * @see #setHorizontalFadingEdgeEnabled 8809 * 8810 * @return The known solid color background for this view, or 0 if the color may vary 8811 */ 8812 public int getSolidColor() { 8813 return 0; 8814 } 8815 8816 /** 8817 * Build a human readable string representation of the specified view flags. 8818 * 8819 * @param flags the view flags to convert to a string 8820 * @return a String representing the supplied flags 8821 */ 8822 private static String printFlags(int flags) { 8823 String output = ""; 8824 int numFlags = 0; 8825 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 8826 output += "TAKES_FOCUS"; 8827 numFlags++; 8828 } 8829 8830 switch (flags & VISIBILITY_MASK) { 8831 case INVISIBLE: 8832 if (numFlags > 0) { 8833 output += " "; 8834 } 8835 output += "INVISIBLE"; 8836 // USELESS HERE numFlags++; 8837 break; 8838 case GONE: 8839 if (numFlags > 0) { 8840 output += " "; 8841 } 8842 output += "GONE"; 8843 // USELESS HERE numFlags++; 8844 break; 8845 default: 8846 break; 8847 } 8848 return output; 8849 } 8850 8851 /** 8852 * Build a human readable string representation of the specified private 8853 * view flags. 8854 * 8855 * @param privateFlags the private view flags to convert to a string 8856 * @return a String representing the supplied flags 8857 */ 8858 private static String printPrivateFlags(int privateFlags) { 8859 String output = ""; 8860 int numFlags = 0; 8861 8862 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 8863 output += "WANTS_FOCUS"; 8864 numFlags++; 8865 } 8866 8867 if ((privateFlags & FOCUSED) == FOCUSED) { 8868 if (numFlags > 0) { 8869 output += " "; 8870 } 8871 output += "FOCUSED"; 8872 numFlags++; 8873 } 8874 8875 if ((privateFlags & SELECTED) == SELECTED) { 8876 if (numFlags > 0) { 8877 output += " "; 8878 } 8879 output += "SELECTED"; 8880 numFlags++; 8881 } 8882 8883 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 8884 if (numFlags > 0) { 8885 output += " "; 8886 } 8887 output += "IS_ROOT_NAMESPACE"; 8888 numFlags++; 8889 } 8890 8891 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 8892 if (numFlags > 0) { 8893 output += " "; 8894 } 8895 output += "HAS_BOUNDS"; 8896 numFlags++; 8897 } 8898 8899 if ((privateFlags & DRAWN) == DRAWN) { 8900 if (numFlags > 0) { 8901 output += " "; 8902 } 8903 output += "DRAWN"; 8904 // USELESS HERE numFlags++; 8905 } 8906 return output; 8907 } 8908 8909 /** 8910 * <p>Indicates whether or not this view's layout will be requested during 8911 * the next hierarchy layout pass.</p> 8912 * 8913 * @return true if the layout will be forced during next layout pass 8914 */ 8915 public boolean isLayoutRequested() { 8916 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 8917 } 8918 8919 /** 8920 * Assign a size and position to a view and all of its 8921 * descendants 8922 * 8923 * <p>This is the second phase of the layout mechanism. 8924 * (The first is measuring). In this phase, each parent calls 8925 * layout on all of its children to position them. 8926 * This is typically done using the child measurements 8927 * that were stored in the measure pass().</p> 8928 * 8929 * <p>Derived classes should not override this method. 8930 * Derived classes with children should override 8931 * onLayout. In that method, they should 8932 * call layout on each of their children.</p> 8933 * 8934 * @param l Left position, relative to parent 8935 * @param t Top position, relative to parent 8936 * @param r Right position, relative to parent 8937 * @param b Bottom position, relative to parent 8938 */ 8939 @SuppressWarnings({"unchecked"}) 8940 public void layout(int l, int t, int r, int b) { 8941 int oldL = mLeft; 8942 int oldT = mTop; 8943 int oldB = mBottom; 8944 int oldR = mRight; 8945 boolean changed = setFrame(l, t, r, b); 8946 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 8947 if (ViewDebug.TRACE_HIERARCHY) { 8948 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 8949 } 8950 8951 onLayout(changed, l, t, r, b); 8952 mPrivateFlags &= ~LAYOUT_REQUIRED; 8953 8954 if (mOnLayoutChangeListeners != null) { 8955 ArrayList<OnLayoutChangeListener> listenersCopy = 8956 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 8957 int numListeners = listenersCopy.size(); 8958 for (int i = 0; i < numListeners; ++i) { 8959 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 8960 } 8961 } 8962 } 8963 mPrivateFlags &= ~FORCE_LAYOUT; 8964 } 8965 8966 /** 8967 * Called from layout when this view should 8968 * assign a size and position to each of its children. 8969 * 8970 * Derived classes with children should override 8971 * this method and call layout on each of 8972 * their children. 8973 * @param changed This is a new size or position for this view 8974 * @param left Left position, relative to parent 8975 * @param top Top position, relative to parent 8976 * @param right Right position, relative to parent 8977 * @param bottom Bottom position, relative to parent 8978 */ 8979 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 8980 } 8981 8982 /** 8983 * Assign a size and position to this view. 8984 * 8985 * This is called from layout. 8986 * 8987 * @param left Left position, relative to parent 8988 * @param top Top position, relative to parent 8989 * @param right Right position, relative to parent 8990 * @param bottom Bottom position, relative to parent 8991 * @return true if the new size and position are different than the 8992 * previous ones 8993 * {@hide} 8994 */ 8995 protected boolean setFrame(int left, int top, int right, int bottom) { 8996 boolean changed = false; 8997 8998 if (DBG) { 8999 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 9000 + right + "," + bottom + ")"); 9001 } 9002 9003 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 9004 changed = true; 9005 9006 // Remember our drawn bit 9007 int drawn = mPrivateFlags & DRAWN; 9008 9009 // Invalidate our old position 9010 invalidate(); 9011 9012 9013 int oldWidth = mRight - mLeft; 9014 int oldHeight = mBottom - mTop; 9015 9016 mLeft = left; 9017 mTop = top; 9018 mRight = right; 9019 mBottom = bottom; 9020 9021 mPrivateFlags |= HAS_BOUNDS; 9022 9023 int newWidth = right - left; 9024 int newHeight = bottom - top; 9025 9026 if (newWidth != oldWidth || newHeight != oldHeight) { 9027 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9028 // A change in dimension means an auto-centered pivot point changes, too 9029 mMatrixDirty = true; 9030 } 9031 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 9032 } 9033 9034 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 9035 // If we are visible, force the DRAWN bit to on so that 9036 // this invalidate will go through (at least to our parent). 9037 // This is because someone may have invalidated this view 9038 // before this call to setFrame came in, thereby clearing 9039 // the DRAWN bit. 9040 mPrivateFlags |= DRAWN; 9041 invalidate(); 9042 } 9043 9044 // Reset drawn bit to original value (invalidate turns it off) 9045 mPrivateFlags |= drawn; 9046 9047 mBackgroundSizeChanged = true; 9048 } 9049 return changed; 9050 } 9051 9052 /** 9053 * Finalize inflating a view from XML. This is called as the last phase 9054 * of inflation, after all child views have been added. 9055 * 9056 * <p>Even if the subclass overrides onFinishInflate, they should always be 9057 * sure to call the super method, so that we get called. 9058 */ 9059 protected void onFinishInflate() { 9060 } 9061 9062 /** 9063 * Returns the resources associated with this view. 9064 * 9065 * @return Resources object. 9066 */ 9067 public Resources getResources() { 9068 return mResources; 9069 } 9070 9071 /** 9072 * Invalidates the specified Drawable. 9073 * 9074 * @param drawable the drawable to invalidate 9075 */ 9076 public void invalidateDrawable(Drawable drawable) { 9077 if (verifyDrawable(drawable)) { 9078 final Rect dirty = drawable.getBounds(); 9079 final int scrollX = mScrollX; 9080 final int scrollY = mScrollY; 9081 9082 invalidate(dirty.left + scrollX, dirty.top + scrollY, 9083 dirty.right + scrollX, dirty.bottom + scrollY); 9084 } 9085 } 9086 9087 /** 9088 * Schedules an action on a drawable to occur at a specified time. 9089 * 9090 * @param who the recipient of the action 9091 * @param what the action to run on the drawable 9092 * @param when the time at which the action must occur. Uses the 9093 * {@link SystemClock#uptimeMillis} timebase. 9094 */ 9095 public void scheduleDrawable(Drawable who, Runnable what, long when) { 9096 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9097 mAttachInfo.mHandler.postAtTime(what, who, when); 9098 } 9099 } 9100 9101 /** 9102 * Cancels a scheduled action on a drawable. 9103 * 9104 * @param who the recipient of the action 9105 * @param what the action to cancel 9106 */ 9107 public void unscheduleDrawable(Drawable who, Runnable what) { 9108 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9109 mAttachInfo.mHandler.removeCallbacks(what, who); 9110 } 9111 } 9112 9113 /** 9114 * Unschedule any events associated with the given Drawable. This can be 9115 * used when selecting a new Drawable into a view, so that the previous 9116 * one is completely unscheduled. 9117 * 9118 * @param who The Drawable to unschedule. 9119 * 9120 * @see #drawableStateChanged 9121 */ 9122 public void unscheduleDrawable(Drawable who) { 9123 if (mAttachInfo != null) { 9124 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 9125 } 9126 } 9127 9128 /** 9129 * If your view subclass is displaying its own Drawable objects, it should 9130 * override this function and return true for any Drawable it is 9131 * displaying. This allows animations for those drawables to be 9132 * scheduled. 9133 * 9134 * <p>Be sure to call through to the super class when overriding this 9135 * function. 9136 * 9137 * @param who The Drawable to verify. Return true if it is one you are 9138 * displaying, else return the result of calling through to the 9139 * super class. 9140 * 9141 * @return boolean If true than the Drawable is being displayed in the 9142 * view; else false and it is not allowed to animate. 9143 * 9144 * @see #unscheduleDrawable 9145 * @see #drawableStateChanged 9146 */ 9147 protected boolean verifyDrawable(Drawable who) { 9148 return who == mBGDrawable; 9149 } 9150 9151 /** 9152 * This function is called whenever the state of the view changes in such 9153 * a way that it impacts the state of drawables being shown. 9154 * 9155 * <p>Be sure to call through to the superclass when overriding this 9156 * function. 9157 * 9158 * @see Drawable#setState 9159 */ 9160 protected void drawableStateChanged() { 9161 Drawable d = mBGDrawable; 9162 if (d != null && d.isStateful()) { 9163 d.setState(getDrawableState()); 9164 } 9165 } 9166 9167 /** 9168 * Call this to force a view to update its drawable state. This will cause 9169 * drawableStateChanged to be called on this view. Views that are interested 9170 * in the new state should call getDrawableState. 9171 * 9172 * @see #drawableStateChanged 9173 * @see #getDrawableState 9174 */ 9175 public void refreshDrawableState() { 9176 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9177 drawableStateChanged(); 9178 9179 ViewParent parent = mParent; 9180 if (parent != null) { 9181 parent.childDrawableStateChanged(this); 9182 } 9183 } 9184 9185 /** 9186 * Return an array of resource IDs of the drawable states representing the 9187 * current state of the view. 9188 * 9189 * @return The current drawable state 9190 * 9191 * @see Drawable#setState 9192 * @see #drawableStateChanged 9193 * @see #onCreateDrawableState 9194 */ 9195 public final int[] getDrawableState() { 9196 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 9197 return mDrawableState; 9198 } else { 9199 mDrawableState = onCreateDrawableState(0); 9200 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 9201 return mDrawableState; 9202 } 9203 } 9204 9205 /** 9206 * Generate the new {@link android.graphics.drawable.Drawable} state for 9207 * this view. This is called by the view 9208 * system when the cached Drawable state is determined to be invalid. To 9209 * retrieve the current state, you should use {@link #getDrawableState}. 9210 * 9211 * @param extraSpace if non-zero, this is the number of extra entries you 9212 * would like in the returned array in which you can place your own 9213 * states. 9214 * 9215 * @return Returns an array holding the current {@link Drawable} state of 9216 * the view. 9217 * 9218 * @see #mergeDrawableStates 9219 */ 9220 protected int[] onCreateDrawableState(int extraSpace) { 9221 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 9222 mParent instanceof View) { 9223 return ((View) mParent).onCreateDrawableState(extraSpace); 9224 } 9225 9226 int[] drawableState; 9227 9228 int privateFlags = mPrivateFlags; 9229 9230 int viewStateIndex = 0; 9231 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 9232 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 9233 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 9234 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 9235 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 9236 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 9237 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested) { 9238 // This is set if HW acceleration is requested, even if the current 9239 // process doesn't allow it. This is just to allow app preview 9240 // windows to better match their app. 9241 viewStateIndex |= VIEW_STATE_ACCELERATED; 9242 } 9243 9244 drawableState = VIEW_STATE_SETS[viewStateIndex]; 9245 9246 //noinspection ConstantIfStatement 9247 if (false) { 9248 Log.i("View", "drawableStateIndex=" + viewStateIndex); 9249 Log.i("View", toString() 9250 + " pressed=" + ((privateFlags & PRESSED) != 0) 9251 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 9252 + " fo=" + hasFocus() 9253 + " sl=" + ((privateFlags & SELECTED) != 0) 9254 + " wf=" + hasWindowFocus() 9255 + ": " + Arrays.toString(drawableState)); 9256 } 9257 9258 if (extraSpace == 0) { 9259 return drawableState; 9260 } 9261 9262 final int[] fullState; 9263 if (drawableState != null) { 9264 fullState = new int[drawableState.length + extraSpace]; 9265 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 9266 } else { 9267 fullState = new int[extraSpace]; 9268 } 9269 9270 return fullState; 9271 } 9272 9273 /** 9274 * Merge your own state values in <var>additionalState</var> into the base 9275 * state values <var>baseState</var> that were returned by 9276 * {@link #onCreateDrawableState}. 9277 * 9278 * @param baseState The base state values returned by 9279 * {@link #onCreateDrawableState}, which will be modified to also hold your 9280 * own additional state values. 9281 * 9282 * @param additionalState The additional state values you would like 9283 * added to <var>baseState</var>; this array is not modified. 9284 * 9285 * @return As a convenience, the <var>baseState</var> array you originally 9286 * passed into the function is returned. 9287 * 9288 * @see #onCreateDrawableState 9289 */ 9290 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 9291 final int N = baseState.length; 9292 int i = N - 1; 9293 while (i >= 0 && baseState[i] == 0) { 9294 i--; 9295 } 9296 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 9297 return baseState; 9298 } 9299 9300 /** 9301 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 9302 * on all Drawable objects associated with this view. 9303 */ 9304 public void jumpDrawablesToCurrentState() { 9305 if (mBGDrawable != null) { 9306 mBGDrawable.jumpToCurrentState(); 9307 } 9308 } 9309 9310 /** 9311 * Sets the background color for this view. 9312 * @param color the color of the background 9313 */ 9314 @RemotableViewMethod 9315 public void setBackgroundColor(int color) { 9316 if (mBGDrawable instanceof ColorDrawable) { 9317 ((ColorDrawable) mBGDrawable).setColor(color); 9318 } else { 9319 setBackgroundDrawable(new ColorDrawable(color)); 9320 } 9321 } 9322 9323 /** 9324 * Set the background to a given resource. The resource should refer to 9325 * a Drawable object or 0 to remove the background. 9326 * @param resid The identifier of the resource. 9327 * @attr ref android.R.styleable#View_background 9328 */ 9329 @RemotableViewMethod 9330 public void setBackgroundResource(int resid) { 9331 if (resid != 0 && resid == mBackgroundResource) { 9332 return; 9333 } 9334 9335 Drawable d= null; 9336 if (resid != 0) { 9337 d = mResources.getDrawable(resid); 9338 } 9339 setBackgroundDrawable(d); 9340 9341 mBackgroundResource = resid; 9342 } 9343 9344 /** 9345 * Set the background to a given Drawable, or remove the background. If the 9346 * background has padding, this View's padding is set to the background's 9347 * padding. However, when a background is removed, this View's padding isn't 9348 * touched. If setting the padding is desired, please use 9349 * {@link #setPadding(int, int, int, int)}. 9350 * 9351 * @param d The Drawable to use as the background, or null to remove the 9352 * background 9353 */ 9354 public void setBackgroundDrawable(Drawable d) { 9355 boolean requestLayout = false; 9356 9357 mBackgroundResource = 0; 9358 9359 /* 9360 * Regardless of whether we're setting a new background or not, we want 9361 * to clear the previous drawable. 9362 */ 9363 if (mBGDrawable != null) { 9364 mBGDrawable.setCallback(null); 9365 unscheduleDrawable(mBGDrawable); 9366 } 9367 9368 if (d != null) { 9369 Rect padding = sThreadLocal.get(); 9370 if (padding == null) { 9371 padding = new Rect(); 9372 sThreadLocal.set(padding); 9373 } 9374 if (d.getPadding(padding)) { 9375 setPadding(padding.left, padding.top, padding.right, padding.bottom); 9376 } 9377 9378 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 9379 // if it has a different minimum size, we should layout again 9380 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 9381 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 9382 requestLayout = true; 9383 } 9384 9385 d.setCallback(this); 9386 if (d.isStateful()) { 9387 d.setState(getDrawableState()); 9388 } 9389 d.setVisible(getVisibility() == VISIBLE, false); 9390 mBGDrawable = d; 9391 9392 if ((mPrivateFlags & SKIP_DRAW) != 0) { 9393 mPrivateFlags &= ~SKIP_DRAW; 9394 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 9395 requestLayout = true; 9396 } 9397 } else { 9398 /* Remove the background */ 9399 mBGDrawable = null; 9400 9401 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 9402 /* 9403 * This view ONLY drew the background before and we're removing 9404 * the background, so now it won't draw anything 9405 * (hence we SKIP_DRAW) 9406 */ 9407 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 9408 mPrivateFlags |= SKIP_DRAW; 9409 } 9410 9411 /* 9412 * When the background is set, we try to apply its padding to this 9413 * View. When the background is removed, we don't touch this View's 9414 * padding. This is noted in the Javadocs. Hence, we don't need to 9415 * requestLayout(), the invalidate() below is sufficient. 9416 */ 9417 9418 // The old background's minimum size could have affected this 9419 // View's layout, so let's requestLayout 9420 requestLayout = true; 9421 } 9422 9423 computeOpaqueFlags(); 9424 9425 if (requestLayout) { 9426 requestLayout(); 9427 } 9428 9429 mBackgroundSizeChanged = true; 9430 invalidate(); 9431 } 9432 9433 /** 9434 * Gets the background drawable 9435 * @return The drawable used as the background for this view, if any. 9436 */ 9437 public Drawable getBackground() { 9438 return mBGDrawable; 9439 } 9440 9441 /** 9442 * Sets the padding. The view may add on the space required to display 9443 * the scrollbars, depending on the style and visibility of the scrollbars. 9444 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 9445 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 9446 * from the values set in this call. 9447 * 9448 * @attr ref android.R.styleable#View_padding 9449 * @attr ref android.R.styleable#View_paddingBottom 9450 * @attr ref android.R.styleable#View_paddingLeft 9451 * @attr ref android.R.styleable#View_paddingRight 9452 * @attr ref android.R.styleable#View_paddingTop 9453 * @param left the left padding in pixels 9454 * @param top the top padding in pixels 9455 * @param right the right padding in pixels 9456 * @param bottom the bottom padding in pixels 9457 */ 9458 public void setPadding(int left, int top, int right, int bottom) { 9459 boolean changed = false; 9460 9461 mUserPaddingLeft = left; 9462 mUserPaddingRight = right; 9463 mUserPaddingBottom = bottom; 9464 9465 final int viewFlags = mViewFlags; 9466 9467 // Common case is there are no scroll bars. 9468 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 9469 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 9470 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 9471 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 9472 ? 0 : getVerticalScrollbarWidth(); 9473 switch (mVerticalScrollbarPosition) { 9474 case SCROLLBAR_POSITION_DEFAULT: 9475 case SCROLLBAR_POSITION_RIGHT: 9476 right += offset; 9477 break; 9478 case SCROLLBAR_POSITION_LEFT: 9479 left += offset; 9480 break; 9481 } 9482 } 9483 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 9484 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 9485 ? 0 : getHorizontalScrollbarHeight(); 9486 } 9487 } 9488 9489 if (mPaddingLeft != left) { 9490 changed = true; 9491 mPaddingLeft = left; 9492 } 9493 if (mPaddingTop != top) { 9494 changed = true; 9495 mPaddingTop = top; 9496 } 9497 if (mPaddingRight != right) { 9498 changed = true; 9499 mPaddingRight = right; 9500 } 9501 if (mPaddingBottom != bottom) { 9502 changed = true; 9503 mPaddingBottom = bottom; 9504 } 9505 9506 if (changed) { 9507 requestLayout(); 9508 } 9509 } 9510 9511 /** 9512 * Returns the top padding of this view. 9513 * 9514 * @return the top padding in pixels 9515 */ 9516 public int getPaddingTop() { 9517 return mPaddingTop; 9518 } 9519 9520 /** 9521 * Returns the bottom padding of this view. If there are inset and enabled 9522 * scrollbars, this value may include the space required to display the 9523 * scrollbars as well. 9524 * 9525 * @return the bottom padding in pixels 9526 */ 9527 public int getPaddingBottom() { 9528 return mPaddingBottom; 9529 } 9530 9531 /** 9532 * Returns the left padding of this view. If there are inset and enabled 9533 * scrollbars, this value may include the space required to display the 9534 * scrollbars as well. 9535 * 9536 * @return the left padding in pixels 9537 */ 9538 public int getPaddingLeft() { 9539 return mPaddingLeft; 9540 } 9541 9542 /** 9543 * Returns the right padding of this view. If there are inset and enabled 9544 * scrollbars, this value may include the space required to display the 9545 * scrollbars as well. 9546 * 9547 * @return the right padding in pixels 9548 */ 9549 public int getPaddingRight() { 9550 return mPaddingRight; 9551 } 9552 9553 /** 9554 * Changes the selection state of this view. A view can be selected or not. 9555 * Note that selection is not the same as focus. Views are typically 9556 * selected in the context of an AdapterView like ListView or GridView; 9557 * the selected view is the view that is highlighted. 9558 * 9559 * @param selected true if the view must be selected, false otherwise 9560 */ 9561 public void setSelected(boolean selected) { 9562 if (((mPrivateFlags & SELECTED) != 0) != selected) { 9563 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 9564 if (!selected) resetPressedState(); 9565 invalidate(); 9566 refreshDrawableState(); 9567 dispatchSetSelected(selected); 9568 } 9569 } 9570 9571 /** 9572 * Dispatch setSelected to all of this View's children. 9573 * 9574 * @see #setSelected(boolean) 9575 * 9576 * @param selected The new selected state 9577 */ 9578 protected void dispatchSetSelected(boolean selected) { 9579 } 9580 9581 /** 9582 * Indicates the selection state of this view. 9583 * 9584 * @return true if the view is selected, false otherwise 9585 */ 9586 @ViewDebug.ExportedProperty 9587 public boolean isSelected() { 9588 return (mPrivateFlags & SELECTED) != 0; 9589 } 9590 9591 /** 9592 * Changes the activated state of this view. A view can be activated or not. 9593 * Note that activation is not the same as selection. Selection is 9594 * a transient property, representing the view (hierarchy) the user is 9595 * currently interacting with. Activation is a longer-term state that the 9596 * user can move views in and out of. For example, in a list view with 9597 * single or multiple selection enabled, the views in the current selection 9598 * set are activated. (Um, yeah, we are deeply sorry about the terminology 9599 * here.) The activated state is propagated down to children of the view it 9600 * is set on. 9601 * 9602 * @param activated true if the view must be activated, false otherwise 9603 */ 9604 public void setActivated(boolean activated) { 9605 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 9606 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 9607 invalidate(); 9608 refreshDrawableState(); 9609 dispatchSetActivated(activated); 9610 } 9611 } 9612 9613 /** 9614 * Dispatch setActivated to all of this View's children. 9615 * 9616 * @see #setActivated(boolean) 9617 * 9618 * @param activated The new activated state 9619 */ 9620 protected void dispatchSetActivated(boolean activated) { 9621 } 9622 9623 /** 9624 * Indicates the activation state of this view. 9625 * 9626 * @return true if the view is activated, false otherwise 9627 */ 9628 @ViewDebug.ExportedProperty 9629 public boolean isActivated() { 9630 return (mPrivateFlags & ACTIVATED) != 0; 9631 } 9632 9633 /** 9634 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 9635 * observer can be used to get notifications when global events, like 9636 * layout, happen. 9637 * 9638 * The returned ViewTreeObserver observer is not guaranteed to remain 9639 * valid for the lifetime of this View. If the caller of this method keeps 9640 * a long-lived reference to ViewTreeObserver, it should always check for 9641 * the return value of {@link ViewTreeObserver#isAlive()}. 9642 * 9643 * @return The ViewTreeObserver for this view's hierarchy. 9644 */ 9645 public ViewTreeObserver getViewTreeObserver() { 9646 if (mAttachInfo != null) { 9647 return mAttachInfo.mTreeObserver; 9648 } 9649 if (mFloatingTreeObserver == null) { 9650 mFloatingTreeObserver = new ViewTreeObserver(); 9651 } 9652 return mFloatingTreeObserver; 9653 } 9654 9655 /** 9656 * <p>Finds the topmost view in the current view hierarchy.</p> 9657 * 9658 * @return the topmost view containing this view 9659 */ 9660 public View getRootView() { 9661 if (mAttachInfo != null) { 9662 final View v = mAttachInfo.mRootView; 9663 if (v != null) { 9664 return v; 9665 } 9666 } 9667 9668 View parent = this; 9669 9670 while (parent.mParent != null && parent.mParent instanceof View) { 9671 parent = (View) parent.mParent; 9672 } 9673 9674 return parent; 9675 } 9676 9677 /** 9678 * <p>Computes the coordinates of this view on the screen. The argument 9679 * must be an array of two integers. After the method returns, the array 9680 * contains the x and y location in that order.</p> 9681 * 9682 * @param location an array of two integers in which to hold the coordinates 9683 */ 9684 public void getLocationOnScreen(int[] location) { 9685 getLocationInWindow(location); 9686 9687 final AttachInfo info = mAttachInfo; 9688 if (info != null) { 9689 location[0] += info.mWindowLeft; 9690 location[1] += info.mWindowTop; 9691 } 9692 } 9693 9694 /** 9695 * <p>Computes the coordinates of this view in its window. The argument 9696 * must be an array of two integers. After the method returns, the array 9697 * contains the x and y location in that order.</p> 9698 * 9699 * @param location an array of two integers in which to hold the coordinates 9700 */ 9701 public void getLocationInWindow(int[] location) { 9702 if (location == null || location.length < 2) { 9703 throw new IllegalArgumentException("location must be an array of " 9704 + "two integers"); 9705 } 9706 9707 location[0] = mLeft + (int) (mTranslationX + 0.5f); 9708 location[1] = mTop + (int) (mTranslationY + 0.5f); 9709 9710 ViewParent viewParent = mParent; 9711 while (viewParent instanceof View) { 9712 final View view = (View)viewParent; 9713 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 9714 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 9715 viewParent = view.mParent; 9716 } 9717 9718 if (viewParent instanceof ViewRoot) { 9719 // *cough* 9720 final ViewRoot vr = (ViewRoot)viewParent; 9721 location[1] -= vr.mCurScrollY; 9722 } 9723 } 9724 9725 /** 9726 * {@hide} 9727 * @param id the id of the view to be found 9728 * @return the view of the specified id, null if cannot be found 9729 */ 9730 protected View findViewTraversal(int id) { 9731 if (id == mID) { 9732 return this; 9733 } 9734 return null; 9735 } 9736 9737 /** 9738 * {@hide} 9739 * @param tag the tag of the view to be found 9740 * @return the view of specified tag, null if cannot be found 9741 */ 9742 protected View findViewWithTagTraversal(Object tag) { 9743 if (tag != null && tag.equals(mTag)) { 9744 return this; 9745 } 9746 return null; 9747 } 9748 9749 /** 9750 * {@hide} 9751 * @param predicate The predicate to evaluate. 9752 * @return The first view that matches the predicate or null. 9753 */ 9754 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 9755 if (predicate.apply(this)) { 9756 return this; 9757 } 9758 return null; 9759 } 9760 9761 /** 9762 * Look for a child view with the given id. If this view has the given 9763 * id, return this view. 9764 * 9765 * @param id The id to search for. 9766 * @return The view that has the given id in the hierarchy or null 9767 */ 9768 public final View findViewById(int id) { 9769 if (id < 0) { 9770 return null; 9771 } 9772 return findViewTraversal(id); 9773 } 9774 9775 /** 9776 * Look for a child view with the given tag. If this view has the given 9777 * tag, return this view. 9778 * 9779 * @param tag The tag to search for, using "tag.equals(getTag())". 9780 * @return The View that has the given tag in the hierarchy or null 9781 */ 9782 public final View findViewWithTag(Object tag) { 9783 if (tag == null) { 9784 return null; 9785 } 9786 return findViewWithTagTraversal(tag); 9787 } 9788 9789 /** 9790 * {@hide} 9791 * Look for a child view that matches the specified predicate. 9792 * If this view matches the predicate, return this view. 9793 * 9794 * @param predicate The predicate to evaluate. 9795 * @return The first view that matches the predicate or null. 9796 */ 9797 public final View findViewByPredicate(Predicate<View> predicate) { 9798 return findViewByPredicateTraversal(predicate); 9799 } 9800 9801 /** 9802 * Sets the identifier for this view. The identifier does not have to be 9803 * unique in this view's hierarchy. The identifier should be a positive 9804 * number. 9805 * 9806 * @see #NO_ID 9807 * @see #getId 9808 * @see #findViewById 9809 * 9810 * @param id a number used to identify the view 9811 * 9812 * @attr ref android.R.styleable#View_id 9813 */ 9814 public void setId(int id) { 9815 mID = id; 9816 } 9817 9818 /** 9819 * {@hide} 9820 * 9821 * @param isRoot true if the view belongs to the root namespace, false 9822 * otherwise 9823 */ 9824 public void setIsRootNamespace(boolean isRoot) { 9825 if (isRoot) { 9826 mPrivateFlags |= IS_ROOT_NAMESPACE; 9827 } else { 9828 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 9829 } 9830 } 9831 9832 /** 9833 * {@hide} 9834 * 9835 * @return true if the view belongs to the root namespace, false otherwise 9836 */ 9837 public boolean isRootNamespace() { 9838 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 9839 } 9840 9841 /** 9842 * Returns this view's identifier. 9843 * 9844 * @return a positive integer used to identify the view or {@link #NO_ID} 9845 * if the view has no ID 9846 * 9847 * @see #setId 9848 * @see #findViewById 9849 * @attr ref android.R.styleable#View_id 9850 */ 9851 @ViewDebug.CapturedViewProperty 9852 public int getId() { 9853 return mID; 9854 } 9855 9856 /** 9857 * Returns this view's tag. 9858 * 9859 * @return the Object stored in this view as a tag 9860 * 9861 * @see #setTag(Object) 9862 * @see #getTag(int) 9863 */ 9864 @ViewDebug.ExportedProperty 9865 public Object getTag() { 9866 return mTag; 9867 } 9868 9869 /** 9870 * Sets the tag associated with this view. A tag can be used to mark 9871 * a view in its hierarchy and does not have to be unique within the 9872 * hierarchy. Tags can also be used to store data within a view without 9873 * resorting to another data structure. 9874 * 9875 * @param tag an Object to tag the view with 9876 * 9877 * @see #getTag() 9878 * @see #setTag(int, Object) 9879 */ 9880 public void setTag(final Object tag) { 9881 mTag = tag; 9882 } 9883 9884 /** 9885 * Returns the tag associated with this view and the specified key. 9886 * 9887 * @param key The key identifying the tag 9888 * 9889 * @return the Object stored in this view as a tag 9890 * 9891 * @see #setTag(int, Object) 9892 * @see #getTag() 9893 */ 9894 public Object getTag(int key) { 9895 SparseArray<Object> tags = null; 9896 synchronized (sTagsLock) { 9897 if (sTags != null) { 9898 tags = sTags.get(this); 9899 } 9900 } 9901 9902 if (tags != null) return tags.get(key); 9903 return null; 9904 } 9905 9906 /** 9907 * Sets a tag associated with this view and a key. A tag can be used 9908 * to mark a view in its hierarchy and does not have to be unique within 9909 * the hierarchy. Tags can also be used to store data within a view 9910 * without resorting to another data structure. 9911 * 9912 * The specified key should be an id declared in the resources of the 9913 * application to ensure it is unique (see the <a 9914 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 9915 * Keys identified as belonging to 9916 * the Android framework or not associated with any package will cause 9917 * an {@link IllegalArgumentException} to be thrown. 9918 * 9919 * @param key The key identifying the tag 9920 * @param tag An Object to tag the view with 9921 * 9922 * @throws IllegalArgumentException If they specified key is not valid 9923 * 9924 * @see #setTag(Object) 9925 * @see #getTag(int) 9926 */ 9927 public void setTag(int key, final Object tag) { 9928 // If the package id is 0x00 or 0x01, it's either an undefined package 9929 // or a framework id 9930 if ((key >>> 24) < 2) { 9931 throw new IllegalArgumentException("The key must be an application-specific " 9932 + "resource id."); 9933 } 9934 9935 setTagInternal(this, key, tag); 9936 } 9937 9938 /** 9939 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 9940 * framework id. 9941 * 9942 * @hide 9943 */ 9944 public void setTagInternal(int key, Object tag) { 9945 if ((key >>> 24) != 0x1) { 9946 throw new IllegalArgumentException("The key must be a framework-specific " 9947 + "resource id."); 9948 } 9949 9950 setTagInternal(this, key, tag); 9951 } 9952 9953 private static void setTagInternal(View view, int key, Object tag) { 9954 SparseArray<Object> tags = null; 9955 synchronized (sTagsLock) { 9956 if (sTags == null) { 9957 sTags = new WeakHashMap<View, SparseArray<Object>>(); 9958 } else { 9959 tags = sTags.get(view); 9960 } 9961 } 9962 9963 if (tags == null) { 9964 tags = new SparseArray<Object>(2); 9965 synchronized (sTagsLock) { 9966 sTags.put(view, tags); 9967 } 9968 } 9969 9970 tags.put(key, tag); 9971 } 9972 9973 /** 9974 * @param consistency The type of consistency. See ViewDebug for more information. 9975 * 9976 * @hide 9977 */ 9978 protected boolean dispatchConsistencyCheck(int consistency) { 9979 return onConsistencyCheck(consistency); 9980 } 9981 9982 /** 9983 * Method that subclasses should implement to check their consistency. The type of 9984 * consistency check is indicated by the bit field passed as a parameter. 9985 * 9986 * @param consistency The type of consistency. See ViewDebug for more information. 9987 * 9988 * @throws IllegalStateException if the view is in an inconsistent state. 9989 * 9990 * @hide 9991 */ 9992 protected boolean onConsistencyCheck(int consistency) { 9993 boolean result = true; 9994 9995 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 9996 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 9997 9998 if (checkLayout) { 9999 if (getParent() == null) { 10000 result = false; 10001 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10002 "View " + this + " does not have a parent."); 10003 } 10004 10005 if (mAttachInfo == null) { 10006 result = false; 10007 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10008 "View " + this + " is not attached to a window."); 10009 } 10010 } 10011 10012 if (checkDrawing) { 10013 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 10014 // from their draw() method 10015 10016 if ((mPrivateFlags & DRAWN) != DRAWN && 10017 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 10018 result = false; 10019 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10020 "View " + this + " was invalidated but its drawing cache is valid."); 10021 } 10022 } 10023 10024 return result; 10025 } 10026 10027 /** 10028 * Prints information about this view in the log output, with the tag 10029 * {@link #VIEW_LOG_TAG}. 10030 * 10031 * @hide 10032 */ 10033 public void debug() { 10034 debug(0); 10035 } 10036 10037 /** 10038 * Prints information about this view in the log output, with the tag 10039 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 10040 * indentation defined by the <code>depth</code>. 10041 * 10042 * @param depth the indentation level 10043 * 10044 * @hide 10045 */ 10046 protected void debug(int depth) { 10047 String output = debugIndent(depth - 1); 10048 10049 output += "+ " + this; 10050 int id = getId(); 10051 if (id != -1) { 10052 output += " (id=" + id + ")"; 10053 } 10054 Object tag = getTag(); 10055 if (tag != null) { 10056 output += " (tag=" + tag + ")"; 10057 } 10058 Log.d(VIEW_LOG_TAG, output); 10059 10060 if ((mPrivateFlags & FOCUSED) != 0) { 10061 output = debugIndent(depth) + " FOCUSED"; 10062 Log.d(VIEW_LOG_TAG, output); 10063 } 10064 10065 output = debugIndent(depth); 10066 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 10067 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 10068 + "} "; 10069 Log.d(VIEW_LOG_TAG, output); 10070 10071 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 10072 || mPaddingBottom != 0) { 10073 output = debugIndent(depth); 10074 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 10075 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 10076 Log.d(VIEW_LOG_TAG, output); 10077 } 10078 10079 output = debugIndent(depth); 10080 output += "mMeasureWidth=" + mMeasuredWidth + 10081 " mMeasureHeight=" + mMeasuredHeight; 10082 Log.d(VIEW_LOG_TAG, output); 10083 10084 output = debugIndent(depth); 10085 if (mLayoutParams == null) { 10086 output += "BAD! no layout params"; 10087 } else { 10088 output = mLayoutParams.debug(output); 10089 } 10090 Log.d(VIEW_LOG_TAG, output); 10091 10092 output = debugIndent(depth); 10093 output += "flags={"; 10094 output += View.printFlags(mViewFlags); 10095 output += "}"; 10096 Log.d(VIEW_LOG_TAG, output); 10097 10098 output = debugIndent(depth); 10099 output += "privateFlags={"; 10100 output += View.printPrivateFlags(mPrivateFlags); 10101 output += "}"; 10102 Log.d(VIEW_LOG_TAG, output); 10103 } 10104 10105 /** 10106 * Creates an string of whitespaces used for indentation. 10107 * 10108 * @param depth the indentation level 10109 * @return a String containing (depth * 2 + 3) * 2 white spaces 10110 * 10111 * @hide 10112 */ 10113 protected static String debugIndent(int depth) { 10114 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 10115 for (int i = 0; i < (depth * 2) + 3; i++) { 10116 spaces.append(' ').append(' '); 10117 } 10118 return spaces.toString(); 10119 } 10120 10121 /** 10122 * <p>Return the offset of the widget's text baseline from the widget's top 10123 * boundary. If this widget does not support baseline alignment, this 10124 * method returns -1. </p> 10125 * 10126 * @return the offset of the baseline within the widget's bounds or -1 10127 * if baseline alignment is not supported 10128 */ 10129 @ViewDebug.ExportedProperty(category = "layout") 10130 public int getBaseline() { 10131 return -1; 10132 } 10133 10134 /** 10135 * Call this when something has changed which has invalidated the 10136 * layout of this view. This will schedule a layout pass of the view 10137 * tree. 10138 */ 10139 public void requestLayout() { 10140 if (ViewDebug.TRACE_HIERARCHY) { 10141 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 10142 } 10143 10144 mPrivateFlags |= FORCE_LAYOUT; 10145 10146 if (mParent != null && !mParent.isLayoutRequested()) { 10147 mParent.requestLayout(); 10148 } 10149 } 10150 10151 /** 10152 * Forces this view to be laid out during the next layout pass. 10153 * This method does not call requestLayout() or forceLayout() 10154 * on the parent. 10155 */ 10156 public void forceLayout() { 10157 mPrivateFlags |= FORCE_LAYOUT; 10158 } 10159 10160 /** 10161 * <p> 10162 * This is called to find out how big a view should be. The parent 10163 * supplies constraint information in the width and height parameters. 10164 * </p> 10165 * 10166 * <p> 10167 * The actual mesurement work of a view is performed in 10168 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 10169 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 10170 * </p> 10171 * 10172 * 10173 * @param widthMeasureSpec Horizontal space requirements as imposed by the 10174 * parent 10175 * @param heightMeasureSpec Vertical space requirements as imposed by the 10176 * parent 10177 * 10178 * @see #onMeasure(int, int) 10179 */ 10180 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 10181 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 10182 widthMeasureSpec != mOldWidthMeasureSpec || 10183 heightMeasureSpec != mOldHeightMeasureSpec) { 10184 10185 // first clears the measured dimension flag 10186 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 10187 10188 if (ViewDebug.TRACE_HIERARCHY) { 10189 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 10190 } 10191 10192 // measure ourselves, this should set the measured dimension flag back 10193 onMeasure(widthMeasureSpec, heightMeasureSpec); 10194 10195 // flag not set, setMeasuredDimension() was not invoked, we raise 10196 // an exception to warn the developer 10197 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 10198 throw new IllegalStateException("onMeasure() did not set the" 10199 + " measured dimension by calling" 10200 + " setMeasuredDimension()"); 10201 } 10202 10203 mPrivateFlags |= LAYOUT_REQUIRED; 10204 } 10205 10206 mOldWidthMeasureSpec = widthMeasureSpec; 10207 mOldHeightMeasureSpec = heightMeasureSpec; 10208 } 10209 10210 /** 10211 * <p> 10212 * Measure the view and its content to determine the measured width and the 10213 * measured height. This method is invoked by {@link #measure(int, int)} and 10214 * should be overriden by subclasses to provide accurate and efficient 10215 * measurement of their contents. 10216 * </p> 10217 * 10218 * <p> 10219 * <strong>CONTRACT:</strong> When overriding this method, you 10220 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 10221 * measured width and height of this view. Failure to do so will trigger an 10222 * <code>IllegalStateException</code>, thrown by 10223 * {@link #measure(int, int)}. Calling the superclass' 10224 * {@link #onMeasure(int, int)} is a valid use. 10225 * </p> 10226 * 10227 * <p> 10228 * The base class implementation of measure defaults to the background size, 10229 * unless a larger size is allowed by the MeasureSpec. Subclasses should 10230 * override {@link #onMeasure(int, int)} to provide better measurements of 10231 * their content. 10232 * </p> 10233 * 10234 * <p> 10235 * If this method is overridden, it is the subclass's responsibility to make 10236 * sure the measured height and width are at least the view's minimum height 10237 * and width ({@link #getSuggestedMinimumHeight()} and 10238 * {@link #getSuggestedMinimumWidth()}). 10239 * </p> 10240 * 10241 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 10242 * The requirements are encoded with 10243 * {@link android.view.View.MeasureSpec}. 10244 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 10245 * The requirements are encoded with 10246 * {@link android.view.View.MeasureSpec}. 10247 * 10248 * @see #getMeasuredWidth() 10249 * @see #getMeasuredHeight() 10250 * @see #setMeasuredDimension(int, int) 10251 * @see #getSuggestedMinimumHeight() 10252 * @see #getSuggestedMinimumWidth() 10253 * @see android.view.View.MeasureSpec#getMode(int) 10254 * @see android.view.View.MeasureSpec#getSize(int) 10255 */ 10256 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 10257 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 10258 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 10259 } 10260 10261 /** 10262 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 10263 * measured width and measured height. Failing to do so will trigger an 10264 * exception at measurement time.</p> 10265 * 10266 * @param measuredWidth The measured width of this view. May be a complex 10267 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10268 * {@link #MEASURED_STATE_TOO_SMALL}. 10269 * @param measuredHeight The measured height of this view. May be a complex 10270 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10271 * {@link #MEASURED_STATE_TOO_SMALL}. 10272 */ 10273 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 10274 mMeasuredWidth = measuredWidth; 10275 mMeasuredHeight = measuredHeight; 10276 10277 mPrivateFlags |= MEASURED_DIMENSION_SET; 10278 } 10279 10280 /** 10281 * Merge two states as returned by {@link #getMeasuredState()}. 10282 * @param curState The current state as returned from a view or the result 10283 * of combining multiple views. 10284 * @param newState The new view state to combine. 10285 * @return Returns a new integer reflecting the combination of the two 10286 * states. 10287 */ 10288 public static int combineMeasuredStates(int curState, int newState) { 10289 return curState | newState; 10290 } 10291 10292 /** 10293 * Version of {@link #resolveSizeAndState(int, int, int)} 10294 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 10295 */ 10296 public static int resolveSize(int size, int measureSpec) { 10297 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 10298 } 10299 10300 /** 10301 * Utility to reconcile a desired size and state, with constraints imposed 10302 * by a MeasureSpec. Will take the desired size, unless a different size 10303 * is imposed by the constraints. The returned value is a compound integer, 10304 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 10305 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 10306 * size is smaller than the size the view wants to be. 10307 * 10308 * @param size How big the view wants to be 10309 * @param measureSpec Constraints imposed by the parent 10310 * @return Size information bit mask as defined by 10311 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 10312 */ 10313 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 10314 int result = size; 10315 int specMode = MeasureSpec.getMode(measureSpec); 10316 int specSize = MeasureSpec.getSize(measureSpec); 10317 switch (specMode) { 10318 case MeasureSpec.UNSPECIFIED: 10319 result = size; 10320 break; 10321 case MeasureSpec.AT_MOST: 10322 if (specSize < size) { 10323 result = specSize | MEASURED_STATE_TOO_SMALL; 10324 } else { 10325 result = size; 10326 } 10327 break; 10328 case MeasureSpec.EXACTLY: 10329 result = specSize; 10330 break; 10331 } 10332 return result | (childMeasuredState&MEASURED_STATE_MASK); 10333 } 10334 10335 /** 10336 * Utility to return a default size. Uses the supplied size if the 10337 * MeasureSpec imposed no contraints. Will get larger if allowed 10338 * by the MeasureSpec. 10339 * 10340 * @param size Default size for this view 10341 * @param measureSpec Constraints imposed by the parent 10342 * @return The size this view should be. 10343 */ 10344 public static int getDefaultSize(int size, int measureSpec) { 10345 int result = size; 10346 int specMode = MeasureSpec.getMode(measureSpec); 10347 int specSize = MeasureSpec.getSize(measureSpec); 10348 10349 switch (specMode) { 10350 case MeasureSpec.UNSPECIFIED: 10351 result = size; 10352 break; 10353 case MeasureSpec.AT_MOST: 10354 case MeasureSpec.EXACTLY: 10355 result = specSize; 10356 break; 10357 } 10358 return result; 10359 } 10360 10361 /** 10362 * Returns the suggested minimum height that the view should use. This 10363 * returns the maximum of the view's minimum height 10364 * and the background's minimum height 10365 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 10366 * <p> 10367 * When being used in {@link #onMeasure(int, int)}, the caller should still 10368 * ensure the returned height is within the requirements of the parent. 10369 * 10370 * @return The suggested minimum height of the view. 10371 */ 10372 protected int getSuggestedMinimumHeight() { 10373 int suggestedMinHeight = mMinHeight; 10374 10375 if (mBGDrawable != null) { 10376 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 10377 if (suggestedMinHeight < bgMinHeight) { 10378 suggestedMinHeight = bgMinHeight; 10379 } 10380 } 10381 10382 return suggestedMinHeight; 10383 } 10384 10385 /** 10386 * Returns the suggested minimum width that the view should use. This 10387 * returns the maximum of the view's minimum width) 10388 * and the background's minimum width 10389 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 10390 * <p> 10391 * When being used in {@link #onMeasure(int, int)}, the caller should still 10392 * ensure the returned width is within the requirements of the parent. 10393 * 10394 * @return The suggested minimum width of the view. 10395 */ 10396 protected int getSuggestedMinimumWidth() { 10397 int suggestedMinWidth = mMinWidth; 10398 10399 if (mBGDrawable != null) { 10400 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 10401 if (suggestedMinWidth < bgMinWidth) { 10402 suggestedMinWidth = bgMinWidth; 10403 } 10404 } 10405 10406 return suggestedMinWidth; 10407 } 10408 10409 /** 10410 * Sets the minimum height of the view. It is not guaranteed the view will 10411 * be able to achieve this minimum height (for example, if its parent layout 10412 * constrains it with less available height). 10413 * 10414 * @param minHeight The minimum height the view will try to be. 10415 */ 10416 public void setMinimumHeight(int minHeight) { 10417 mMinHeight = minHeight; 10418 } 10419 10420 /** 10421 * Sets the minimum width of the view. It is not guaranteed the view will 10422 * be able to achieve this minimum width (for example, if its parent layout 10423 * constrains it with less available width). 10424 * 10425 * @param minWidth The minimum width the view will try to be. 10426 */ 10427 public void setMinimumWidth(int minWidth) { 10428 mMinWidth = minWidth; 10429 } 10430 10431 /** 10432 * Get the animation currently associated with this view. 10433 * 10434 * @return The animation that is currently playing or 10435 * scheduled to play for this view. 10436 */ 10437 public Animation getAnimation() { 10438 return mCurrentAnimation; 10439 } 10440 10441 /** 10442 * Start the specified animation now. 10443 * 10444 * @param animation the animation to start now 10445 */ 10446 public void startAnimation(Animation animation) { 10447 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 10448 setAnimation(animation); 10449 invalidate(); 10450 } 10451 10452 /** 10453 * Cancels any animations for this view. 10454 */ 10455 public void clearAnimation() { 10456 if (mCurrentAnimation != null) { 10457 mCurrentAnimation.detach(); 10458 } 10459 mCurrentAnimation = null; 10460 } 10461 10462 /** 10463 * Sets the next animation to play for this view. 10464 * If you want the animation to play immediately, use 10465 * startAnimation. This method provides allows fine-grained 10466 * control over the start time and invalidation, but you 10467 * must make sure that 1) the animation has a start time set, and 10468 * 2) the view will be invalidated when the animation is supposed to 10469 * start. 10470 * 10471 * @param animation The next animation, or null. 10472 */ 10473 public void setAnimation(Animation animation) { 10474 mCurrentAnimation = animation; 10475 if (animation != null) { 10476 animation.reset(); 10477 } 10478 } 10479 10480 /** 10481 * Invoked by a parent ViewGroup to notify the start of the animation 10482 * currently associated with this view. If you override this method, 10483 * always call super.onAnimationStart(); 10484 * 10485 * @see #setAnimation(android.view.animation.Animation) 10486 * @see #getAnimation() 10487 */ 10488 protected void onAnimationStart() { 10489 mPrivateFlags |= ANIMATION_STARTED; 10490 } 10491 10492 /** 10493 * Invoked by a parent ViewGroup to notify the end of the animation 10494 * currently associated with this view. If you override this method, 10495 * always call super.onAnimationEnd(); 10496 * 10497 * @see #setAnimation(android.view.animation.Animation) 10498 * @see #getAnimation() 10499 */ 10500 protected void onAnimationEnd() { 10501 mPrivateFlags &= ~ANIMATION_STARTED; 10502 } 10503 10504 /** 10505 * Invoked if there is a Transform that involves alpha. Subclass that can 10506 * draw themselves with the specified alpha should return true, and then 10507 * respect that alpha when their onDraw() is called. If this returns false 10508 * then the view may be redirected to draw into an offscreen buffer to 10509 * fulfill the request, which will look fine, but may be slower than if the 10510 * subclass handles it internally. The default implementation returns false. 10511 * 10512 * @param alpha The alpha (0..255) to apply to the view's drawing 10513 * @return true if the view can draw with the specified alpha. 10514 */ 10515 protected boolean onSetAlpha(int alpha) { 10516 return false; 10517 } 10518 10519 /** 10520 * This is used by the RootView to perform an optimization when 10521 * the view hierarchy contains one or several SurfaceView. 10522 * SurfaceView is always considered transparent, but its children are not, 10523 * therefore all View objects remove themselves from the global transparent 10524 * region (passed as a parameter to this function). 10525 * 10526 * @param region The transparent region for this ViewRoot (window). 10527 * 10528 * @return Returns true if the effective visibility of the view at this 10529 * point is opaque, regardless of the transparent region; returns false 10530 * if it is possible for underlying windows to be seen behind the view. 10531 * 10532 * {@hide} 10533 */ 10534 public boolean gatherTransparentRegion(Region region) { 10535 final AttachInfo attachInfo = mAttachInfo; 10536 if (region != null && attachInfo != null) { 10537 final int pflags = mPrivateFlags; 10538 if ((pflags & SKIP_DRAW) == 0) { 10539 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 10540 // remove it from the transparent region. 10541 final int[] location = attachInfo.mTransparentLocation; 10542 getLocationInWindow(location); 10543 region.op(location[0], location[1], location[0] + mRight - mLeft, 10544 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 10545 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 10546 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 10547 // exists, so we remove the background drawable's non-transparent 10548 // parts from this transparent region. 10549 applyDrawableToTransparentRegion(mBGDrawable, region); 10550 } 10551 } 10552 return true; 10553 } 10554 10555 /** 10556 * Play a sound effect for this view. 10557 * 10558 * <p>The framework will play sound effects for some built in actions, such as 10559 * clicking, but you may wish to play these effects in your widget, 10560 * for instance, for internal navigation. 10561 * 10562 * <p>The sound effect will only be played if sound effects are enabled by the user, and 10563 * {@link #isSoundEffectsEnabled()} is true. 10564 * 10565 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 10566 */ 10567 public void playSoundEffect(int soundConstant) { 10568 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 10569 return; 10570 } 10571 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 10572 } 10573 10574 /** 10575 * BZZZTT!!1! 10576 * 10577 * <p>Provide haptic feedback to the user for this view. 10578 * 10579 * <p>The framework will provide haptic feedback for some built in actions, 10580 * such as long presses, but you may wish to provide feedback for your 10581 * own widget. 10582 * 10583 * <p>The feedback will only be performed if 10584 * {@link #isHapticFeedbackEnabled()} is true. 10585 * 10586 * @param feedbackConstant One of the constants defined in 10587 * {@link HapticFeedbackConstants} 10588 */ 10589 public boolean performHapticFeedback(int feedbackConstant) { 10590 return performHapticFeedback(feedbackConstant, 0); 10591 } 10592 10593 /** 10594 * BZZZTT!!1! 10595 * 10596 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 10597 * 10598 * @param feedbackConstant One of the constants defined in 10599 * {@link HapticFeedbackConstants} 10600 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 10601 */ 10602 public boolean performHapticFeedback(int feedbackConstant, int flags) { 10603 if (mAttachInfo == null) { 10604 return false; 10605 } 10606 //noinspection SimplifiableIfStatement 10607 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 10608 && !isHapticFeedbackEnabled()) { 10609 return false; 10610 } 10611 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 10612 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 10613 } 10614 10615 /** 10616 * !!! TODO: real docs 10617 * 10618 * The base class implementation makes the shadow the same size and appearance 10619 * as the view itself, and positions it with its center at the touch point. 10620 */ 10621 public static class DragShadowBuilder { 10622 private final WeakReference<View> mView; 10623 10624 /** 10625 * Construct a shadow builder object for use with the given View object. The 10626 * default implementation will construct a drag shadow the same size and 10627 * appearance as the supplied View. 10628 * 10629 * @param view A view within the application's layout whose appearance 10630 * should be replicated as the drag shadow. 10631 */ 10632 public DragShadowBuilder(View view) { 10633 mView = new WeakReference<View>(view); 10634 } 10635 10636 /** 10637 * Construct a shadow builder object with no associated View. This 10638 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 10639 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 10640 * to supply the drag shadow's dimensions and appearance without 10641 * reference to any View object. 10642 */ 10643 public DragShadowBuilder() { 10644 mView = new WeakReference<View>(null); 10645 } 10646 10647 /** 10648 * Returns the View object that had been passed to the 10649 * {@link #View.DragShadowBuilder(View)} 10650 * constructor. If that View parameter was {@code null} or if the 10651 * {@link #View.DragShadowBuilder()} 10652 * constructor was used to instantiate the builder object, this method will return 10653 * null. 10654 * 10655 * @return The View object associate with this builder object. 10656 */ 10657 final public View getView() { 10658 return mView.get(); 10659 } 10660 10661 /** 10662 * Provide the draggable-shadow metrics for the operation: the dimensions of 10663 * the shadow image itself, and the point within that shadow that should 10664 * be centered under the touch location while dragging. 10665 * <p> 10666 * The default implementation sets the dimensions of the shadow to be the 10667 * same as the dimensions of the View object that had been supplied to the 10668 * {@link #View.DragShadowBuilder(View)} constructor 10669 * when the builder object was instantiated, and centers the shadow under the touch 10670 * point. 10671 * 10672 * @param shadowSize The application should set the {@code x} member of this 10673 * parameter to the desired shadow width, and the {@code y} member to 10674 * the desired height. 10675 * @param shadowTouchPoint The application should set this point to be the 10676 * location within the shadow that should track directly underneath 10677 * the touch point on the screen during a drag. 10678 */ 10679 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 10680 final View view = mView.get(); 10681 if (view != null) { 10682 shadowSize.set(view.getWidth(), view.getHeight()); 10683 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 10684 } else { 10685 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 10686 } 10687 } 10688 10689 /** 10690 * Draw the shadow image for the upcoming drag. The shadow canvas was 10691 * created with the dimensions supplied by the 10692 * {@link #onProvideShadowMetrics(Point, Point)} callback. 10693 * <p> 10694 * The default implementation replicates the appearance of the View object 10695 * that had been supplied to the 10696 * {@link #View.DragShadowBuilder(View)} 10697 * constructor when the builder object was instantiated. 10698 * 10699 * @param canvas 10700 */ 10701 public void onDrawShadow(Canvas canvas) { 10702 final View view = mView.get(); 10703 if (view != null) { 10704 view.draw(canvas); 10705 } else { 10706 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 10707 } 10708 } 10709 } 10710 10711 /** 10712 * Drag and drop. App calls startDrag(), then callbacks to the shadow builder's 10713 * {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} and 10714 * {@link DragShadowBuilder#onDrawShadow(Canvas)} methods happen, then the drag 10715 * operation is handed over to the OS. 10716 * !!! TODO: real docs 10717 * 10718 * @param data !!! TODO 10719 * @param shadowBuilder !!! TODO 10720 * @param myLocalState An arbitrary object that will be passed as part of every DragEvent 10721 * delivered to the calling application during the course of the current drag operation. 10722 * This object is private to the application that called startDrag(), and is not 10723 * visible to other applications. It provides a lightweight way for the application to 10724 * propagate information from the initiator to the recipient of a drag within its own 10725 * application; for example, to help disambiguate between 'copy' and 'move' semantics. 10726 * @param flags Flags affecting the drag operation. At present no flags are defined; 10727 * pass 0 for this parameter. 10728 * @return {@code true} if the drag operation was initiated successfully; {@code false} if 10729 * an error prevented the drag from taking place. 10730 */ 10731 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 10732 Object myLocalState, int flags) { 10733 if (ViewDebug.DEBUG_DRAG) { 10734 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 10735 } 10736 boolean okay = false; 10737 10738 Point shadowSize = new Point(); 10739 Point shadowTouchPoint = new Point(); 10740 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 10741 10742 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 10743 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 10744 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 10745 } 10746 10747 if (ViewDebug.DEBUG_DRAG) { 10748 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 10749 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 10750 } 10751 Surface surface = new Surface(); 10752 try { 10753 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 10754 flags, shadowSize.x, shadowSize.y, surface); 10755 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 10756 + " surface=" + surface); 10757 if (token != null) { 10758 Canvas canvas = surface.lockCanvas(null); 10759 try { 10760 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 10761 shadowBuilder.onDrawShadow(canvas); 10762 } finally { 10763 surface.unlockCanvasAndPost(canvas); 10764 } 10765 10766 final ViewRoot root = getViewRoot(); 10767 10768 // Cache the local state object for delivery with DragEvents 10769 root.setLocalDragState(myLocalState); 10770 10771 // repurpose 'shadowSize' for the last touch point 10772 root.getLastTouchPoint(shadowSize); 10773 10774 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 10775 shadowSize.x, shadowSize.y, 10776 shadowTouchPoint.x, shadowTouchPoint.y, data); 10777 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 10778 } 10779 } catch (Exception e) { 10780 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 10781 surface.destroy(); 10782 } 10783 10784 return okay; 10785 } 10786 10787 /** 10788 * Drag-and-drop event dispatch. The event.getAction() verb is one of the DragEvent 10789 * constants DRAG_STARTED_EVENT, DRAG_EVENT, DROP_EVENT, and DRAG_ENDED_EVENT. 10790 * 10791 * For DRAG_STARTED_EVENT, event.getClipDescription() describes the content 10792 * being dragged. onDragEvent() should return 'true' if the view can handle 10793 * a drop of that content. A view that returns 'false' here will receive no 10794 * further calls to onDragEvent() about the drag/drop operation. 10795 * 10796 * For DRAG_ENTERED, event.getClipDescription() describes the content being 10797 * dragged. This will be the same content description passed in the 10798 * DRAG_STARTED_EVENT invocation. 10799 * 10800 * For DRAG_EXITED, event.getClipDescription() describes the content being 10801 * dragged. This will be the same content description passed in the 10802 * DRAG_STARTED_EVENT invocation. The view should return to its approriate 10803 * drag-acceptance visual state. 10804 * 10805 * For DRAG_LOCATION_EVENT, event.getX() and event.getY() give the location in View 10806 * coordinates of the current drag point. The view must return 'true' if it 10807 * can accept a drop of the current drag content, false otherwise. 10808 * 10809 * For DROP_EVENT, event.getX() and event.getY() give the location of the drop 10810 * within the view; also, event.getClipData() returns the full data payload 10811 * being dropped. The view should return 'true' if it consumed the dropped 10812 * content, 'false' if it did not. 10813 * 10814 * For DRAG_ENDED_EVENT, the 'event' argument may be null. The view should return 10815 * to its normal visual state. 10816 */ 10817 public boolean onDragEvent(DragEvent event) { 10818 return false; 10819 } 10820 10821 /** 10822 * Views typically don't need to override dispatchDragEvent(); it just calls 10823 * onDragEvent(event) and passes the result up appropriately. 10824 */ 10825 public boolean dispatchDragEvent(DragEvent event) { 10826 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 10827 && mOnDragListener.onDrag(this, event)) { 10828 return true; 10829 } 10830 return onDragEvent(event); 10831 } 10832 10833 /** 10834 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 10835 * it is ever exposed at all. 10836 * @hide 10837 */ 10838 public void onCloseSystemDialogs(String reason) { 10839 } 10840 10841 /** 10842 * Given a Drawable whose bounds have been set to draw into this view, 10843 * update a Region being computed for {@link #gatherTransparentRegion} so 10844 * that any non-transparent parts of the Drawable are removed from the 10845 * given transparent region. 10846 * 10847 * @param dr The Drawable whose transparency is to be applied to the region. 10848 * @param region A Region holding the current transparency information, 10849 * where any parts of the region that are set are considered to be 10850 * transparent. On return, this region will be modified to have the 10851 * transparency information reduced by the corresponding parts of the 10852 * Drawable that are not transparent. 10853 * {@hide} 10854 */ 10855 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 10856 if (DBG) { 10857 Log.i("View", "Getting transparent region for: " + this); 10858 } 10859 final Region r = dr.getTransparentRegion(); 10860 final Rect db = dr.getBounds(); 10861 final AttachInfo attachInfo = mAttachInfo; 10862 if (r != null && attachInfo != null) { 10863 final int w = getRight()-getLeft(); 10864 final int h = getBottom()-getTop(); 10865 if (db.left > 0) { 10866 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 10867 r.op(0, 0, db.left, h, Region.Op.UNION); 10868 } 10869 if (db.right < w) { 10870 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 10871 r.op(db.right, 0, w, h, Region.Op.UNION); 10872 } 10873 if (db.top > 0) { 10874 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 10875 r.op(0, 0, w, db.top, Region.Op.UNION); 10876 } 10877 if (db.bottom < h) { 10878 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 10879 r.op(0, db.bottom, w, h, Region.Op.UNION); 10880 } 10881 final int[] location = attachInfo.mTransparentLocation; 10882 getLocationInWindow(location); 10883 r.translate(location[0], location[1]); 10884 region.op(r, Region.Op.INTERSECT); 10885 } else { 10886 region.op(db, Region.Op.DIFFERENCE); 10887 } 10888 } 10889 10890 private void postCheckForLongClick(int delayOffset) { 10891 mHasPerformedLongPress = false; 10892 10893 if (mPendingCheckForLongPress == null) { 10894 mPendingCheckForLongPress = new CheckForLongPress(); 10895 } 10896 mPendingCheckForLongPress.rememberWindowAttachCount(); 10897 postDelayed(mPendingCheckForLongPress, 10898 ViewConfiguration.getLongPressTimeout() - delayOffset); 10899 } 10900 10901 /** 10902 * Inflate a view from an XML resource. This convenience method wraps the {@link 10903 * LayoutInflater} class, which provides a full range of options for view inflation. 10904 * 10905 * @param context The Context object for your activity or application. 10906 * @param resource The resource ID to inflate 10907 * @param root A view group that will be the parent. Used to properly inflate the 10908 * layout_* parameters. 10909 * @see LayoutInflater 10910 */ 10911 public static View inflate(Context context, int resource, ViewGroup root) { 10912 LayoutInflater factory = LayoutInflater.from(context); 10913 return factory.inflate(resource, root); 10914 } 10915 10916 /** 10917 * Scroll the view with standard behavior for scrolling beyond the normal 10918 * content boundaries. Views that call this method should override 10919 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 10920 * results of an over-scroll operation. 10921 * 10922 * Views can use this method to handle any touch or fling-based scrolling. 10923 * 10924 * @param deltaX Change in X in pixels 10925 * @param deltaY Change in Y in pixels 10926 * @param scrollX Current X scroll value in pixels before applying deltaX 10927 * @param scrollY Current Y scroll value in pixels before applying deltaY 10928 * @param scrollRangeX Maximum content scroll range along the X axis 10929 * @param scrollRangeY Maximum content scroll range along the Y axis 10930 * @param maxOverScrollX Number of pixels to overscroll by in either direction 10931 * along the X axis. 10932 * @param maxOverScrollY Number of pixels to overscroll by in either direction 10933 * along the Y axis. 10934 * @param isTouchEvent true if this scroll operation is the result of a touch event. 10935 * @return true if scrolling was clamped to an over-scroll boundary along either 10936 * axis, false otherwise. 10937 */ 10938 protected boolean overScrollBy(int deltaX, int deltaY, 10939 int scrollX, int scrollY, 10940 int scrollRangeX, int scrollRangeY, 10941 int maxOverScrollX, int maxOverScrollY, 10942 boolean isTouchEvent) { 10943 final int overScrollMode = mOverScrollMode; 10944 final boolean canScrollHorizontal = 10945 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 10946 final boolean canScrollVertical = 10947 computeVerticalScrollRange() > computeVerticalScrollExtent(); 10948 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 10949 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 10950 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 10951 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 10952 10953 int newScrollX = scrollX + deltaX; 10954 if (!overScrollHorizontal) { 10955 maxOverScrollX = 0; 10956 } 10957 10958 int newScrollY = scrollY + deltaY; 10959 if (!overScrollVertical) { 10960 maxOverScrollY = 0; 10961 } 10962 10963 // Clamp values if at the limits and record 10964 final int left = -maxOverScrollX; 10965 final int right = maxOverScrollX + scrollRangeX; 10966 final int top = -maxOverScrollY; 10967 final int bottom = maxOverScrollY + scrollRangeY; 10968 10969 boolean clampedX = false; 10970 if (newScrollX > right) { 10971 newScrollX = right; 10972 clampedX = true; 10973 } else if (newScrollX < left) { 10974 newScrollX = left; 10975 clampedX = true; 10976 } 10977 10978 boolean clampedY = false; 10979 if (newScrollY > bottom) { 10980 newScrollY = bottom; 10981 clampedY = true; 10982 } else if (newScrollY < top) { 10983 newScrollY = top; 10984 clampedY = true; 10985 } 10986 10987 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 10988 10989 return clampedX || clampedY; 10990 } 10991 10992 /** 10993 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 10994 * respond to the results of an over-scroll operation. 10995 * 10996 * @param scrollX New X scroll value in pixels 10997 * @param scrollY New Y scroll value in pixels 10998 * @param clampedX True if scrollX was clamped to an over-scroll boundary 10999 * @param clampedY True if scrollY was clamped to an over-scroll boundary 11000 */ 11001 protected void onOverScrolled(int scrollX, int scrollY, 11002 boolean clampedX, boolean clampedY) { 11003 // Intentionally empty. 11004 } 11005 11006 /** 11007 * Returns the over-scroll mode for this view. The result will be 11008 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11009 * (allow over-scrolling only if the view content is larger than the container), 11010 * or {@link #OVER_SCROLL_NEVER}. 11011 * 11012 * @return This view's over-scroll mode. 11013 */ 11014 public int getOverScrollMode() { 11015 return mOverScrollMode; 11016 } 11017 11018 /** 11019 * Set the over-scroll mode for this view. Valid over-scroll modes are 11020 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11021 * (allow over-scrolling only if the view content is larger than the container), 11022 * or {@link #OVER_SCROLL_NEVER}. 11023 * 11024 * Setting the over-scroll mode of a view will have an effect only if the 11025 * view is capable of scrolling. 11026 * 11027 * @param overScrollMode The new over-scroll mode for this view. 11028 */ 11029 public void setOverScrollMode(int overScrollMode) { 11030 if (overScrollMode != OVER_SCROLL_ALWAYS && 11031 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 11032 overScrollMode != OVER_SCROLL_NEVER) { 11033 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 11034 } 11035 mOverScrollMode = overScrollMode; 11036 } 11037 11038 /** 11039 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 11040 * Each MeasureSpec represents a requirement for either the width or the height. 11041 * A MeasureSpec is comprised of a size and a mode. There are three possible 11042 * modes: 11043 * <dl> 11044 * <dt>UNSPECIFIED</dt> 11045 * <dd> 11046 * The parent has not imposed any constraint on the child. It can be whatever size 11047 * it wants. 11048 * </dd> 11049 * 11050 * <dt>EXACTLY</dt> 11051 * <dd> 11052 * The parent has determined an exact size for the child. The child is going to be 11053 * given those bounds regardless of how big it wants to be. 11054 * </dd> 11055 * 11056 * <dt>AT_MOST</dt> 11057 * <dd> 11058 * The child can be as large as it wants up to the specified size. 11059 * </dd> 11060 * </dl> 11061 * 11062 * MeasureSpecs are implemented as ints to reduce object allocation. This class 11063 * is provided to pack and unpack the <size, mode> tuple into the int. 11064 */ 11065 public static class MeasureSpec { 11066 private static final int MODE_SHIFT = 30; 11067 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 11068 11069 /** 11070 * Measure specification mode: The parent has not imposed any constraint 11071 * on the child. It can be whatever size it wants. 11072 */ 11073 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 11074 11075 /** 11076 * Measure specification mode: The parent has determined an exact size 11077 * for the child. The child is going to be given those bounds regardless 11078 * of how big it wants to be. 11079 */ 11080 public static final int EXACTLY = 1 << MODE_SHIFT; 11081 11082 /** 11083 * Measure specification mode: The child can be as large as it wants up 11084 * to the specified size. 11085 */ 11086 public static final int AT_MOST = 2 << MODE_SHIFT; 11087 11088 /** 11089 * Creates a measure specification based on the supplied size and mode. 11090 * 11091 * The mode must always be one of the following: 11092 * <ul> 11093 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 11094 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 11095 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 11096 * </ul> 11097 * 11098 * @param size the size of the measure specification 11099 * @param mode the mode of the measure specification 11100 * @return the measure specification based on size and mode 11101 */ 11102 public static int makeMeasureSpec(int size, int mode) { 11103 return size + mode; 11104 } 11105 11106 /** 11107 * Extracts the mode from the supplied measure specification. 11108 * 11109 * @param measureSpec the measure specification to extract the mode from 11110 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 11111 * {@link android.view.View.MeasureSpec#AT_MOST} or 11112 * {@link android.view.View.MeasureSpec#EXACTLY} 11113 */ 11114 public static int getMode(int measureSpec) { 11115 return (measureSpec & MODE_MASK); 11116 } 11117 11118 /** 11119 * Extracts the size from the supplied measure specification. 11120 * 11121 * @param measureSpec the measure specification to extract the size from 11122 * @return the size in pixels defined in the supplied measure specification 11123 */ 11124 public static int getSize(int measureSpec) { 11125 return (measureSpec & ~MODE_MASK); 11126 } 11127 11128 /** 11129 * Returns a String representation of the specified measure 11130 * specification. 11131 * 11132 * @param measureSpec the measure specification to convert to a String 11133 * @return a String with the following format: "MeasureSpec: MODE SIZE" 11134 */ 11135 public static String toString(int measureSpec) { 11136 int mode = getMode(measureSpec); 11137 int size = getSize(measureSpec); 11138 11139 StringBuilder sb = new StringBuilder("MeasureSpec: "); 11140 11141 if (mode == UNSPECIFIED) 11142 sb.append("UNSPECIFIED "); 11143 else if (mode == EXACTLY) 11144 sb.append("EXACTLY "); 11145 else if (mode == AT_MOST) 11146 sb.append("AT_MOST "); 11147 else 11148 sb.append(mode).append(" "); 11149 11150 sb.append(size); 11151 return sb.toString(); 11152 } 11153 } 11154 11155 class CheckForLongPress implements Runnable { 11156 11157 private int mOriginalWindowAttachCount; 11158 11159 public void run() { 11160 if (isPressed() && (mParent != null) 11161 && mOriginalWindowAttachCount == mWindowAttachCount) { 11162 if (performLongClick()) { 11163 mHasPerformedLongPress = true; 11164 } 11165 } 11166 } 11167 11168 public void rememberWindowAttachCount() { 11169 mOriginalWindowAttachCount = mWindowAttachCount; 11170 } 11171 } 11172 11173 private final class CheckForTap implements Runnable { 11174 public void run() { 11175 mPrivateFlags &= ~PREPRESSED; 11176 mPrivateFlags |= PRESSED; 11177 refreshDrawableState(); 11178 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 11179 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 11180 } 11181 } 11182 } 11183 11184 private final class PerformClick implements Runnable { 11185 public void run() { 11186 performClick(); 11187 } 11188 } 11189 11190 /** 11191 * Interface definition for a callback to be invoked when a key event is 11192 * dispatched to this view. The callback will be invoked before the key 11193 * event is given to the view. 11194 */ 11195 public interface OnKeyListener { 11196 /** 11197 * Called when a key is dispatched to a view. This allows listeners to 11198 * get a chance to respond before the target view. 11199 * 11200 * @param v The view the key has been dispatched to. 11201 * @param keyCode The code for the physical key that was pressed 11202 * @param event The KeyEvent object containing full information about 11203 * the event. 11204 * @return True if the listener has consumed the event, false otherwise. 11205 */ 11206 boolean onKey(View v, int keyCode, KeyEvent event); 11207 } 11208 11209 /** 11210 * Interface definition for a callback to be invoked when a touch event is 11211 * dispatched to this view. The callback will be invoked before the touch 11212 * event is given to the view. 11213 */ 11214 public interface OnTouchListener { 11215 /** 11216 * Called when a touch event is dispatched to a view. This allows listeners to 11217 * get a chance to respond before the target view. 11218 * 11219 * @param v The view the touch event has been dispatched to. 11220 * @param event The MotionEvent object containing full information about 11221 * the event. 11222 * @return True if the listener has consumed the event, false otherwise. 11223 */ 11224 boolean onTouch(View v, MotionEvent event); 11225 } 11226 11227 /** 11228 * Interface definition for a callback to be invoked when a view has been clicked and held. 11229 */ 11230 public interface OnLongClickListener { 11231 /** 11232 * Called when a view has been clicked and held. 11233 * 11234 * @param v The view that was clicked and held. 11235 * 11236 * @return true if the callback consumed the long click, false otherwise. 11237 */ 11238 boolean onLongClick(View v); 11239 } 11240 11241 /** 11242 * Interface definition for a callback to be invoked when a drag is being dispatched 11243 * to this view. The callback will be invoked before the hosting view's own 11244 * onDrag(event) method. If the listener wants to fall back to the hosting view's 11245 * onDrag(event) behavior, it should return 'false' from this callback. 11246 */ 11247 public interface OnDragListener { 11248 /** 11249 * Called when a drag event is dispatched to a view. This allows listeners 11250 * to get a chance to override base View behavior. 11251 * 11252 * @param v The view the drag has been dispatched to. 11253 * @param event The DragEvent object containing full information 11254 * about the event. 11255 * @return true if the listener consumed the DragEvent, false in order to fall 11256 * back to the view's default handling. 11257 */ 11258 boolean onDrag(View v, DragEvent event); 11259 } 11260 11261 /** 11262 * Interface definition for a callback to be invoked when the focus state of 11263 * a view changed. 11264 */ 11265 public interface OnFocusChangeListener { 11266 /** 11267 * Called when the focus state of a view has changed. 11268 * 11269 * @param v The view whose state has changed. 11270 * @param hasFocus The new focus state of v. 11271 */ 11272 void onFocusChange(View v, boolean hasFocus); 11273 } 11274 11275 /** 11276 * Interface definition for a callback to be invoked when a view is clicked. 11277 */ 11278 public interface OnClickListener { 11279 /** 11280 * Called when a view has been clicked. 11281 * 11282 * @param v The view that was clicked. 11283 */ 11284 void onClick(View v); 11285 } 11286 11287 /** 11288 * Interface definition for a callback to be invoked when the context menu 11289 * for this view is being built. 11290 */ 11291 public interface OnCreateContextMenuListener { 11292 /** 11293 * Called when the context menu for this view is being built. It is not 11294 * safe to hold onto the menu after this method returns. 11295 * 11296 * @param menu The context menu that is being built 11297 * @param v The view for which the context menu is being built 11298 * @param menuInfo Extra information about the item for which the 11299 * context menu should be shown. This information will vary 11300 * depending on the class of v. 11301 */ 11302 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 11303 } 11304 11305 private final class UnsetPressedState implements Runnable { 11306 public void run() { 11307 setPressed(false); 11308 } 11309 } 11310 11311 /** 11312 * Base class for derived classes that want to save and restore their own 11313 * state in {@link android.view.View#onSaveInstanceState()}. 11314 */ 11315 public static class BaseSavedState extends AbsSavedState { 11316 /** 11317 * Constructor used when reading from a parcel. Reads the state of the superclass. 11318 * 11319 * @param source 11320 */ 11321 public BaseSavedState(Parcel source) { 11322 super(source); 11323 } 11324 11325 /** 11326 * Constructor called by derived classes when creating their SavedState objects 11327 * 11328 * @param superState The state of the superclass of this view 11329 */ 11330 public BaseSavedState(Parcelable superState) { 11331 super(superState); 11332 } 11333 11334 public static final Parcelable.Creator<BaseSavedState> CREATOR = 11335 new Parcelable.Creator<BaseSavedState>() { 11336 public BaseSavedState createFromParcel(Parcel in) { 11337 return new BaseSavedState(in); 11338 } 11339 11340 public BaseSavedState[] newArray(int size) { 11341 return new BaseSavedState[size]; 11342 } 11343 }; 11344 } 11345 11346 /** 11347 * A set of information given to a view when it is attached to its parent 11348 * window. 11349 */ 11350 static class AttachInfo { 11351 interface Callbacks { 11352 void playSoundEffect(int effectId); 11353 boolean performHapticFeedback(int effectId, boolean always); 11354 } 11355 11356 /** 11357 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 11358 * to a Handler. This class contains the target (View) to invalidate and 11359 * the coordinates of the dirty rectangle. 11360 * 11361 * For performance purposes, this class also implements a pool of up to 11362 * POOL_LIMIT objects that get reused. This reduces memory allocations 11363 * whenever possible. 11364 */ 11365 static class InvalidateInfo implements Poolable<InvalidateInfo> { 11366 private static final int POOL_LIMIT = 10; 11367 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 11368 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 11369 public InvalidateInfo newInstance() { 11370 return new InvalidateInfo(); 11371 } 11372 11373 public void onAcquired(InvalidateInfo element) { 11374 } 11375 11376 public void onReleased(InvalidateInfo element) { 11377 } 11378 }, POOL_LIMIT) 11379 ); 11380 11381 private InvalidateInfo mNext; 11382 11383 View target; 11384 11385 int left; 11386 int top; 11387 int right; 11388 int bottom; 11389 11390 public void setNextPoolable(InvalidateInfo element) { 11391 mNext = element; 11392 } 11393 11394 public InvalidateInfo getNextPoolable() { 11395 return mNext; 11396 } 11397 11398 static InvalidateInfo acquire() { 11399 return sPool.acquire(); 11400 } 11401 11402 void release() { 11403 sPool.release(this); 11404 } 11405 } 11406 11407 final IWindowSession mSession; 11408 11409 final IWindow mWindow; 11410 11411 final IBinder mWindowToken; 11412 11413 final Callbacks mRootCallbacks; 11414 11415 /** 11416 * The top view of the hierarchy. 11417 */ 11418 View mRootView; 11419 11420 IBinder mPanelParentWindowToken; 11421 Surface mSurface; 11422 11423 boolean mHardwareAccelerated; 11424 boolean mHardwareAccelerationRequested; 11425 HardwareRenderer mHardwareRenderer; 11426 11427 /** 11428 * Scale factor used by the compatibility mode 11429 */ 11430 float mApplicationScale; 11431 11432 /** 11433 * Indicates whether the application is in compatibility mode 11434 */ 11435 boolean mScalingRequired; 11436 11437 /** 11438 * Left position of this view's window 11439 */ 11440 int mWindowLeft; 11441 11442 /** 11443 * Top position of this view's window 11444 */ 11445 int mWindowTop; 11446 11447 /** 11448 * Indicates whether views need to use 32-bit drawing caches 11449 */ 11450 boolean mUse32BitDrawingCache; 11451 11452 /** 11453 * For windows that are full-screen but using insets to layout inside 11454 * of the screen decorations, these are the current insets for the 11455 * content of the window. 11456 */ 11457 final Rect mContentInsets = new Rect(); 11458 11459 /** 11460 * For windows that are full-screen but using insets to layout inside 11461 * of the screen decorations, these are the current insets for the 11462 * actual visible parts of the window. 11463 */ 11464 final Rect mVisibleInsets = new Rect(); 11465 11466 /** 11467 * The internal insets given by this window. This value is 11468 * supplied by the client (through 11469 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 11470 * be given to the window manager when changed to be used in laying 11471 * out windows behind it. 11472 */ 11473 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 11474 = new ViewTreeObserver.InternalInsetsInfo(); 11475 11476 /** 11477 * All views in the window's hierarchy that serve as scroll containers, 11478 * used to determine if the window can be resized or must be panned 11479 * to adjust for a soft input area. 11480 */ 11481 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 11482 11483 final KeyEvent.DispatcherState mKeyDispatchState 11484 = new KeyEvent.DispatcherState(); 11485 11486 /** 11487 * Indicates whether the view's window currently has the focus. 11488 */ 11489 boolean mHasWindowFocus; 11490 11491 /** 11492 * The current visibility of the window. 11493 */ 11494 int mWindowVisibility; 11495 11496 /** 11497 * Indicates the time at which drawing started to occur. 11498 */ 11499 long mDrawingTime; 11500 11501 /** 11502 * Indicates whether or not ignoring the DIRTY_MASK flags. 11503 */ 11504 boolean mIgnoreDirtyState; 11505 11506 /** 11507 * Indicates whether the view's window is currently in touch mode. 11508 */ 11509 boolean mInTouchMode; 11510 11511 /** 11512 * Indicates that ViewRoot should trigger a global layout change 11513 * the next time it performs a traversal 11514 */ 11515 boolean mRecomputeGlobalAttributes; 11516 11517 /** 11518 * Set during a traveral if any views want to keep the screen on. 11519 */ 11520 boolean mKeepScreenOn; 11521 11522 /** 11523 * Set if the visibility of any views has changed. 11524 */ 11525 boolean mViewVisibilityChanged; 11526 11527 /** 11528 * Set to true if a view has been scrolled. 11529 */ 11530 boolean mViewScrollChanged; 11531 11532 /** 11533 * Global to the view hierarchy used as a temporary for dealing with 11534 * x/y points in the transparent region computations. 11535 */ 11536 final int[] mTransparentLocation = new int[2]; 11537 11538 /** 11539 * Global to the view hierarchy used as a temporary for dealing with 11540 * x/y points in the ViewGroup.invalidateChild implementation. 11541 */ 11542 final int[] mInvalidateChildLocation = new int[2]; 11543 11544 11545 /** 11546 * Global to the view hierarchy used as a temporary for dealing with 11547 * x/y location when view is transformed. 11548 */ 11549 final float[] mTmpTransformLocation = new float[2]; 11550 11551 /** 11552 * The view tree observer used to dispatch global events like 11553 * layout, pre-draw, touch mode change, etc. 11554 */ 11555 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 11556 11557 /** 11558 * A Canvas used by the view hierarchy to perform bitmap caching. 11559 */ 11560 Canvas mCanvas; 11561 11562 /** 11563 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 11564 * handler can be used to pump events in the UI events queue. 11565 */ 11566 final Handler mHandler; 11567 11568 /** 11569 * Identifier for messages requesting the view to be invalidated. 11570 * Such messages should be sent to {@link #mHandler}. 11571 */ 11572 static final int INVALIDATE_MSG = 0x1; 11573 11574 /** 11575 * Identifier for messages requesting the view to invalidate a region. 11576 * Such messages should be sent to {@link #mHandler}. 11577 */ 11578 static final int INVALIDATE_RECT_MSG = 0x2; 11579 11580 /** 11581 * Temporary for use in computing invalidate rectangles while 11582 * calling up the hierarchy. 11583 */ 11584 final Rect mTmpInvalRect = new Rect(); 11585 11586 /** 11587 * Temporary for use in computing hit areas with transformed views 11588 */ 11589 final RectF mTmpTransformRect = new RectF(); 11590 11591 /** 11592 * Temporary list for use in collecting focusable descendents of a view. 11593 */ 11594 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 11595 11596 /** 11597 * Creates a new set of attachment information with the specified 11598 * events handler and thread. 11599 * 11600 * @param handler the events handler the view must use 11601 */ 11602 AttachInfo(IWindowSession session, IWindow window, 11603 Handler handler, Callbacks effectPlayer) { 11604 mSession = session; 11605 mWindow = window; 11606 mWindowToken = window.asBinder(); 11607 mHandler = handler; 11608 mRootCallbacks = effectPlayer; 11609 } 11610 } 11611 11612 /** 11613 * <p>ScrollabilityCache holds various fields used by a View when scrolling 11614 * is supported. This avoids keeping too many unused fields in most 11615 * instances of View.</p> 11616 */ 11617 private static class ScrollabilityCache implements Runnable { 11618 11619 /** 11620 * Scrollbars are not visible 11621 */ 11622 public static final int OFF = 0; 11623 11624 /** 11625 * Scrollbars are visible 11626 */ 11627 public static final int ON = 1; 11628 11629 /** 11630 * Scrollbars are fading away 11631 */ 11632 public static final int FADING = 2; 11633 11634 public boolean fadeScrollBars; 11635 11636 public int fadingEdgeLength; 11637 public int scrollBarDefaultDelayBeforeFade; 11638 public int scrollBarFadeDuration; 11639 11640 public int scrollBarSize; 11641 public ScrollBarDrawable scrollBar; 11642 public float[] interpolatorValues; 11643 public View host; 11644 11645 public final Paint paint; 11646 public final Matrix matrix; 11647 public Shader shader; 11648 11649 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 11650 11651 private static final float[] OPAQUE = { 255 }; 11652 private static final float[] TRANSPARENT = { 0.0f }; 11653 11654 /** 11655 * When fading should start. This time moves into the future every time 11656 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 11657 */ 11658 public long fadeStartTime; 11659 11660 11661 /** 11662 * The current state of the scrollbars: ON, OFF, or FADING 11663 */ 11664 public int state = OFF; 11665 11666 private int mLastColor; 11667 11668 public ScrollabilityCache(ViewConfiguration configuration, View host) { 11669 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 11670 scrollBarSize = configuration.getScaledScrollBarSize(); 11671 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 11672 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 11673 11674 paint = new Paint(); 11675 matrix = new Matrix(); 11676 // use use a height of 1, and then wack the matrix each time we 11677 // actually use it. 11678 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 11679 11680 paint.setShader(shader); 11681 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 11682 this.host = host; 11683 } 11684 11685 public void setFadeColor(int color) { 11686 if (color != 0 && color != mLastColor) { 11687 mLastColor = color; 11688 color |= 0xFF000000; 11689 11690 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 11691 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 11692 11693 paint.setShader(shader); 11694 // Restore the default transfer mode (src_over) 11695 paint.setXfermode(null); 11696 } 11697 } 11698 11699 public void run() { 11700 long now = AnimationUtils.currentAnimationTimeMillis(); 11701 if (now >= fadeStartTime) { 11702 11703 // the animation fades the scrollbars out by changing 11704 // the opacity (alpha) from fully opaque to fully 11705 // transparent 11706 int nextFrame = (int) now; 11707 int framesCount = 0; 11708 11709 Interpolator interpolator = scrollBarInterpolator; 11710 11711 // Start opaque 11712 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 11713 11714 // End transparent 11715 nextFrame += scrollBarFadeDuration; 11716 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 11717 11718 state = FADING; 11719 11720 // Kick off the fade animation 11721 host.invalidate(); 11722 } 11723 } 11724 11725 } 11726} 11727