View.java revision e965dee34135e7bce186408d1265a5cfd05a9fb1
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.ServiceManager; 52import android.os.SystemClock; 53import android.os.SystemProperties; 54import android.util.AttributeSet; 55import android.util.Log; 56import android.util.Pool; 57import android.util.Poolable; 58import android.util.PoolableManager; 59import android.util.Pools; 60import android.util.SparseArray; 61import android.view.ContextMenu.ContextMenuInfo; 62import android.view.accessibility.AccessibilityEvent; 63import android.view.accessibility.AccessibilityEventSource; 64import android.view.accessibility.AccessibilityManager; 65import android.view.animation.Animation; 66import android.view.animation.AnimationUtils; 67import android.view.inputmethod.EditorInfo; 68import android.view.inputmethod.InputConnection; 69import android.view.inputmethod.InputMethodManager; 70import android.widget.ScrollBarDrawable; 71 72import java.lang.ref.WeakReference; 73import java.lang.reflect.InvocationTargetException; 74import java.lang.reflect.Method; 75import java.util.ArrayList; 76import java.util.Arrays; 77import java.util.List; 78import java.util.WeakHashMap; 79 80/** 81 * <p> 82 * This class represents the basic building block for user interface components. A View 83 * occupies a rectangular area on the screen and is responsible for drawing and 84 * event handling. View is the base class for <em>widgets</em>, which are 85 * used to create interactive UI components (buttons, text fields, etc.). The 86 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 87 * are invisible containers that hold other Views (or other ViewGroups) and define 88 * their layout properties. 89 * </p> 90 * 91 * <div class="special"> 92 * <p>For an introduction to using this class to develop your 93 * application's user interface, read the Developer Guide documentation on 94 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 95 * include: 96 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 97 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 103 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 104 * </p> 105 * </div> 106 * 107 * <a name="Using"></a> 108 * <h3>Using Views</h3> 109 * <p> 110 * All of the views in a window are arranged in a single tree. You can add views 111 * either from code or by specifying a tree of views in one or more XML layout 112 * files. There are many specialized subclasses of views that act as controls or 113 * are capable of displaying text, images, or other content. 114 * </p> 115 * <p> 116 * Once you have created a tree of views, there are typically a few types of 117 * common operations you may wish to perform: 118 * <ul> 119 * <li><strong>Set properties:</strong> for example setting the text of a 120 * {@link android.widget.TextView}. The available properties and the methods 121 * that set them will vary among the different subclasses of views. Note that 122 * properties that are known at build time can be set in the XML layout 123 * files.</li> 124 * <li><strong>Set focus:</strong> The framework will handled moving focus in 125 * response to user input. To force focus to a specific view, call 126 * {@link #requestFocus}.</li> 127 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 128 * that will be notified when something interesting happens to the view. For 129 * example, all views will let you set a listener to be notified when the view 130 * gains or loses focus. You can register such a listener using 131 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 132 * specialized listeners. For example, a Button exposes a listener to notify 133 * clients when the button is clicked.</li> 134 * <li><strong>Set visibility:</strong> You can hide or show views using 135 * {@link #setVisibility}.</li> 136 * </ul> 137 * </p> 138 * <p><em> 139 * Note: The Android framework is responsible for measuring, laying out and 140 * drawing views. You should not call methods that perform these actions on 141 * views yourself unless you are actually implementing a 142 * {@link android.view.ViewGroup}. 143 * </em></p> 144 * 145 * <a name="Lifecycle"></a> 146 * <h3>Implementing a Custom View</h3> 147 * 148 * <p> 149 * To implement a custom view, you will usually begin by providing overrides for 150 * some of the standard methods that the framework calls on all views. You do 151 * not need to override all of these methods. In fact, you can start by just 152 * overriding {@link #onDraw(android.graphics.Canvas)}. 153 * <table border="2" width="85%" align="center" cellpadding="5"> 154 * <thead> 155 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 156 * </thead> 157 * 158 * <tbody> 159 * <tr> 160 * <td rowspan="2">Creation</td> 161 * <td>Constructors</td> 162 * <td>There is a form of the constructor that are called when the view 163 * is created from code and a form that is called when the view is 164 * inflated from a layout file. The second form should parse and apply 165 * any attributes defined in the layout file. 166 * </td> 167 * </tr> 168 * <tr> 169 * <td><code>{@link #onFinishInflate()}</code></td> 170 * <td>Called after a view and all of its children has been inflated 171 * from XML.</td> 172 * </tr> 173 * 174 * <tr> 175 * <td rowspan="3">Layout</td> 176 * <td><code>{@link #onMeasure}</code></td> 177 * <td>Called to determine the size requirements for this view and all 178 * of its children. 179 * </td> 180 * </tr> 181 * <tr> 182 * <td><code>{@link #onLayout}</code></td> 183 * <td>Called when this view should assign a size and position to all 184 * of its children. 185 * </td> 186 * </tr> 187 * <tr> 188 * <td><code>{@link #onSizeChanged}</code></td> 189 * <td>Called when the size of this view has changed. 190 * </td> 191 * </tr> 192 * 193 * <tr> 194 * <td>Drawing</td> 195 * <td><code>{@link #onDraw}</code></td> 196 * <td>Called when the view should render its content. 197 * </td> 198 * </tr> 199 * 200 * <tr> 201 * <td rowspan="4">Event processing</td> 202 * <td><code>{@link #onKeyDown}</code></td> 203 * <td>Called when a new key event occurs. 204 * </td> 205 * </tr> 206 * <tr> 207 * <td><code>{@link #onKeyUp}</code></td> 208 * <td>Called when a key up event occurs. 209 * </td> 210 * </tr> 211 * <tr> 212 * <td><code>{@link #onTrackballEvent}</code></td> 213 * <td>Called when a trackball motion event occurs. 214 * </td> 215 * </tr> 216 * <tr> 217 * <td><code>{@link #onTouchEvent}</code></td> 218 * <td>Called when a touch screen motion event occurs. 219 * </td> 220 * </tr> 221 * 222 * <tr> 223 * <td rowspan="2">Focus</td> 224 * <td><code>{@link #onFocusChanged}</code></td> 225 * <td>Called when the view gains or loses focus. 226 * </td> 227 * </tr> 228 * 229 * <tr> 230 * <td><code>{@link #onWindowFocusChanged}</code></td> 231 * <td>Called when the window containing the view gains or loses focus. 232 * </td> 233 * </tr> 234 * 235 * <tr> 236 * <td rowspan="3">Attaching</td> 237 * <td><code>{@link #onAttachedToWindow()}</code></td> 238 * <td>Called when the view is attached to a window. 239 * </td> 240 * </tr> 241 * 242 * <tr> 243 * <td><code>{@link #onDetachedFromWindow}</code></td> 244 * <td>Called when the view is detached from its window. 245 * </td> 246 * </tr> 247 * 248 * <tr> 249 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 250 * <td>Called when the visibility of the window containing the view 251 * has changed. 252 * </td> 253 * </tr> 254 * </tbody> 255 * 256 * </table> 257 * </p> 258 * 259 * <a name="IDs"></a> 260 * <h3>IDs</h3> 261 * Views may have an integer id associated with them. These ids are typically 262 * assigned in the layout XML files, and are used to find specific views within 263 * the view tree. A common pattern is to: 264 * <ul> 265 * <li>Define a Button in the layout file and assign it a unique ID. 266 * <pre> 267 * <Button 268 * android:id="@+id/my_button" 269 * android:layout_width="wrap_content" 270 * android:layout_height="wrap_content" 271 * android:text="@string/my_button_text"/> 272 * </pre></li> 273 * <li>From the onCreate method of an Activity, find the Button 274 * <pre class="prettyprint"> 275 * Button myButton = (Button) findViewById(R.id.my_button); 276 * </pre></li> 277 * </ul> 278 * <p> 279 * View IDs need not be unique throughout the tree, but it is good practice to 280 * ensure that they are at least unique within the part of the tree you are 281 * searching. 282 * </p> 283 * 284 * <a name="Position"></a> 285 * <h3>Position</h3> 286 * <p> 287 * The geometry of a view is that of a rectangle. A view has a location, 288 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 289 * two dimensions, expressed as a width and a height. The unit for location 290 * and dimensions is the pixel. 291 * </p> 292 * 293 * <p> 294 * It is possible to retrieve the location of a view by invoking the methods 295 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 296 * coordinate of the rectangle representing the view. The latter returns the 297 * top, or Y, coordinate of the rectangle representing the view. These methods 298 * both return the location of the view relative to its parent. For instance, 299 * when getLeft() returns 20, that means the view is located 20 pixels to the 300 * right of the left edge of its direct parent. 301 * </p> 302 * 303 * <p> 304 * In addition, several convenience methods are offered to avoid unnecessary 305 * computations, namely {@link #getRight()} and {@link #getBottom()}. 306 * These methods return the coordinates of the right and bottom edges of the 307 * rectangle representing the view. For instance, calling {@link #getRight()} 308 * is similar to the following computation: <code>getLeft() + getWidth()</code> 309 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 310 * </p> 311 * 312 * <a name="SizePaddingMargins"></a> 313 * <h3>Size, padding and margins</h3> 314 * <p> 315 * The size of a view is expressed with a width and a height. A view actually 316 * possess two pairs of width and height values. 317 * </p> 318 * 319 * <p> 320 * The first pair is known as <em>measured width</em> and 321 * <em>measured height</em>. These dimensions define how big a view wants to be 322 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 323 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 324 * and {@link #getMeasuredHeight()}. 325 * </p> 326 * 327 * <p> 328 * The second pair is simply known as <em>width</em> and <em>height</em>, or 329 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 330 * dimensions define the actual size of the view on screen, at drawing time and 331 * after layout. These values may, but do not have to, be different from the 332 * measured width and height. The width and height can be obtained by calling 333 * {@link #getWidth()} and {@link #getHeight()}. 334 * </p> 335 * 336 * <p> 337 * To measure its dimensions, a view takes into account its padding. The padding 338 * is expressed in pixels for the left, top, right and bottom parts of the view. 339 * Padding can be used to offset the content of the view by a specific amount of 340 * pixels. For instance, a left padding of 2 will push the view's content by 341 * 2 pixels to the right of the left edge. Padding can be set using the 342 * {@link #setPadding(int, int, int, int)} method and queried by calling 343 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 344 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 345 * </p> 346 * 347 * <p> 348 * Even though a view can define a padding, it does not provide any support for 349 * margins. However, view groups provide such a support. Refer to 350 * {@link android.view.ViewGroup} and 351 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 352 * </p> 353 * 354 * <a name="Layout"></a> 355 * <h3>Layout</h3> 356 * <p> 357 * Layout is a two pass process: a measure pass and a layout pass. The measuring 358 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 359 * of the view tree. Each view pushes dimension specifications down the tree 360 * during the recursion. At the end of the measure pass, every view has stored 361 * its measurements. The second pass happens in 362 * {@link #layout(int,int,int,int)} and is also top-down. During 363 * this pass each parent is responsible for positioning all of its children 364 * using the sizes computed in the measure pass. 365 * </p> 366 * 367 * <p> 368 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 369 * {@link #getMeasuredHeight()} values must be set, along with those for all of 370 * that view's descendants. A view's measured width and measured height values 371 * must respect the constraints imposed by the view's parents. This guarantees 372 * that at the end of the measure pass, all parents accept all of their 373 * children's measurements. A parent view may call measure() more than once on 374 * its children. For example, the parent may measure each child once with 375 * unspecified dimensions to find out how big they want to be, then call 376 * measure() on them again with actual numbers if the sum of all the children's 377 * unconstrained sizes is too big or too small. 378 * </p> 379 * 380 * <p> 381 * The measure pass uses two classes to communicate dimensions. The 382 * {@link MeasureSpec} class is used by views to tell their parents how they 383 * want to be measured and positioned. The base LayoutParams class just 384 * describes how big the view wants to be for both width and height. For each 385 * dimension, it can specify one of: 386 * <ul> 387 * <li> an exact number 388 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 389 * (minus padding) 390 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 391 * enclose its content (plus padding). 392 * </ul> 393 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 394 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 395 * an X and Y value. 396 * </p> 397 * 398 * <p> 399 * MeasureSpecs are used to push requirements down the tree from parent to 400 * child. A MeasureSpec can be in one of three modes: 401 * <ul> 402 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 403 * of a child view. For example, a LinearLayout may call measure() on its child 404 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 405 * tall the child view wants to be given a width of 240 pixels. 406 * <li>EXACTLY: This is used by the parent to impose an exact size on the 407 * child. The child must use this size, and guarantee that all of its 408 * descendants will fit within this size. 409 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 410 * child. The child must gurantee that it and all of its descendants will fit 411 * within this size. 412 * </ul> 413 * </p> 414 * 415 * <p> 416 * To intiate a layout, call {@link #requestLayout}. This method is typically 417 * called by a view on itself when it believes that is can no longer fit within 418 * its current bounds. 419 * </p> 420 * 421 * <a name="Drawing"></a> 422 * <h3>Drawing</h3> 423 * <p> 424 * Drawing is handled by walking the tree and rendering each view that 425 * intersects the the invalid region. Because the tree is traversed in-order, 426 * this means that parents will draw before (i.e., behind) their children, with 427 * siblings drawn in the order they appear in the tree. 428 * If you set a background drawable for a View, then the View will draw it for you 429 * before calling back to its <code>onDraw()</code> method. 430 * </p> 431 * 432 * <p> 433 * Note that the framework will not draw views that are not in the invalid region. 434 * </p> 435 * 436 * <p> 437 * To force a view to draw, call {@link #invalidate()}. 438 * </p> 439 * 440 * <a name="EventHandlingThreading"></a> 441 * <h3>Event Handling and Threading</h3> 442 * <p> 443 * The basic cycle of a view is as follows: 444 * <ol> 445 * <li>An event comes in and is dispatched to the appropriate view. The view 446 * handles the event and notifies any listeners.</li> 447 * <li>If in the course of processing the event, the view's bounds may need 448 * to be changed, the view will call {@link #requestLayout()}.</li> 449 * <li>Similarly, if in the course of processing the event the view's appearance 450 * may need to be changed, the view will call {@link #invalidate()}.</li> 451 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 452 * the framework will take care of measuring, laying out, and drawing the tree 453 * as appropriate.</li> 454 * </ol> 455 * </p> 456 * 457 * <p><em>Note: The entire view tree is single threaded. You must always be on 458 * the UI thread when calling any method on any view.</em> 459 * If you are doing work on other threads and want to update the state of a view 460 * from that thread, you should use a {@link Handler}. 461 * </p> 462 * 463 * <a name="FocusHandling"></a> 464 * <h3>Focus Handling</h3> 465 * <p> 466 * The framework will handle routine focus movement in response to user input. 467 * This includes changing the focus as views are removed or hidden, or as new 468 * views become available. Views indicate their willingness to take focus 469 * through the {@link #isFocusable} method. To change whether a view can take 470 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 471 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 472 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 473 * </p> 474 * <p> 475 * Focus movement is based on an algorithm which finds the nearest neighbor in a 476 * given direction. In rare cases, the default algorithm may not match the 477 * intended behavior of the developer. In these situations, you can provide 478 * explicit overrides by using these XML attributes in the layout file: 479 * <pre> 480 * nextFocusDown 481 * nextFocusLeft 482 * nextFocusRight 483 * nextFocusUp 484 * </pre> 485 * </p> 486 * 487 * 488 * <p> 489 * To get a particular view to take focus, call {@link #requestFocus()}. 490 * </p> 491 * 492 * <a name="TouchMode"></a> 493 * <h3>Touch Mode</h3> 494 * <p> 495 * When a user is navigating a user interface via directional keys such as a D-pad, it is 496 * necessary to give focus to actionable items such as buttons so the user can see 497 * what will take input. If the device has touch capabilities, however, and the user 498 * begins interacting with the interface by touching it, it is no longer necessary to 499 * always highlight, or give focus to, a particular view. This motivates a mode 500 * for interaction named 'touch mode'. 501 * </p> 502 * <p> 503 * For a touch capable device, once the user touches the screen, the device 504 * will enter touch mode. From this point onward, only views for which 505 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 506 * Other views that are touchable, like buttons, will not take focus when touched; they will 507 * only fire the on click listeners. 508 * </p> 509 * <p> 510 * Any time a user hits a directional key, such as a D-pad direction, the view device will 511 * exit touch mode, and find a view to take focus, so that the user may resume interacting 512 * with the user interface without touching the screen again. 513 * </p> 514 * <p> 515 * The touch mode state is maintained across {@link android.app.Activity}s. Call 516 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 517 * </p> 518 * 519 * <a name="Scrolling"></a> 520 * <h3>Scrolling</h3> 521 * <p> 522 * The framework provides basic support for views that wish to internally 523 * scroll their content. This includes keeping track of the X and Y scroll 524 * offset as well as mechanisms for drawing scrollbars. See 525 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 526 * {@link #awakenScrollBars()} for more details. 527 * </p> 528 * 529 * <a name="Tags"></a> 530 * <h3>Tags</h3> 531 * <p> 532 * Unlike IDs, tags are not used to identify views. Tags are essentially an 533 * extra piece of information that can be associated with a view. They are most 534 * often used as a convenience to store data related to views in the views 535 * themselves rather than by putting them in a separate structure. 536 * </p> 537 * 538 * <a name="Animation"></a> 539 * <h3>Animation</h3> 540 * <p> 541 * You can attach an {@link Animation} object to a view using 542 * {@link #setAnimation(Animation)} or 543 * {@link #startAnimation(Animation)}. The animation can alter the scale, 544 * rotation, translation and alpha of a view over time. If the animation is 545 * attached to a view that has children, the animation will affect the entire 546 * subtree rooted by that node. When an animation is started, the framework will 547 * take care of redrawing the appropriate views until the animation completes. 548 * </p> 549 * <p> 550 * Starting with Android 3.0, the preferred way of animating views is to use the 551 * {@link android.animation} package APIs. 552 * </p> 553 * 554 * <a name="Security"></a> 555 * <h3>Security</h3> 556 * <p> 557 * Sometimes it is essential that an application be able to verify that an action 558 * is being performed with the full knowledge and consent of the user, such as 559 * granting a permission request, making a purchase or clicking on an advertisement. 560 * Unfortunately, a malicious application could try to spoof the user into 561 * performing these actions, unaware, by concealing the intended purpose of the view. 562 * As a remedy, the framework offers a touch filtering mechanism that can be used to 563 * improve the security of views that provide access to sensitive functionality. 564 * </p><p> 565 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured} or set the 566 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 567 * will discard touches that are received whenever the view's window is obscured by 568 * another visible window. As a result, the view will not receive touches whenever a 569 * toast, dialog or other window appears above the view's window. 570 * </p><p> 571 * For more fine-grained control over security, consider overriding the 572 * {@link #onFilterTouchEventForSecurity} method to implement your own security policy. 573 * See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 574 * </p> 575 * 576 * @attr ref android.R.styleable#View_alpha 577 * @attr ref android.R.styleable#View_background 578 * @attr ref android.R.styleable#View_clickable 579 * @attr ref android.R.styleable#View_contentDescription 580 * @attr ref android.R.styleable#View_drawingCacheQuality 581 * @attr ref android.R.styleable#View_duplicateParentState 582 * @attr ref android.R.styleable#View_id 583 * @attr ref android.R.styleable#View_fadingEdge 584 * @attr ref android.R.styleable#View_fadingEdgeLength 585 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 586 * @attr ref android.R.styleable#View_fitsSystemWindows 587 * @attr ref android.R.styleable#View_isScrollContainer 588 * @attr ref android.R.styleable#View_focusable 589 * @attr ref android.R.styleable#View_focusableInTouchMode 590 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 591 * @attr ref android.R.styleable#View_keepScreenOn 592 * @attr ref android.R.styleable#View_layerType 593 * @attr ref android.R.styleable#View_longClickable 594 * @attr ref android.R.styleable#View_minHeight 595 * @attr ref android.R.styleable#View_minWidth 596 * @attr ref android.R.styleable#View_nextFocusDown 597 * @attr ref android.R.styleable#View_nextFocusLeft 598 * @attr ref android.R.styleable#View_nextFocusRight 599 * @attr ref android.R.styleable#View_nextFocusUp 600 * @attr ref android.R.styleable#View_onClick 601 * @attr ref android.R.styleable#View_padding 602 * @attr ref android.R.styleable#View_paddingBottom 603 * @attr ref android.R.styleable#View_paddingLeft 604 * @attr ref android.R.styleable#View_paddingRight 605 * @attr ref android.R.styleable#View_paddingTop 606 * @attr ref android.R.styleable#View_saveEnabled 607 * @attr ref android.R.styleable#View_rotation 608 * @attr ref android.R.styleable#View_rotationX 609 * @attr ref android.R.styleable#View_rotationY 610 * @attr ref android.R.styleable#View_scaleX 611 * @attr ref android.R.styleable#View_scaleY 612 * @attr ref android.R.styleable#View_scrollX 613 * @attr ref android.R.styleable#View_scrollY 614 * @attr ref android.R.styleable#View_scrollbarSize 615 * @attr ref android.R.styleable#View_scrollbarStyle 616 * @attr ref android.R.styleable#View_scrollbars 617 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 618 * @attr ref android.R.styleable#View_scrollbarFadeDuration 619 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 621 * @attr ref android.R.styleable#View_scrollbarThumbVertical 622 * @attr ref android.R.styleable#View_scrollbarTrackVertical 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 624 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 625 * @attr ref android.R.styleable#View_soundEffectsEnabled 626 * @attr ref android.R.styleable#View_tag 627 * @attr ref android.R.styleable#View_transformPivotX 628 * @attr ref android.R.styleable#View_transformPivotY 629 * @attr ref android.R.styleable#View_translationX 630 * @attr ref android.R.styleable#View_translationY 631 * @attr ref android.R.styleable#View_visibility 632 * 633 * @see android.view.ViewGroup 634 */ 635public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 636 private static final boolean DBG = false; 637 638 /** 639 * The logging tag used by this class with android.util.Log. 640 */ 641 protected static final String VIEW_LOG_TAG = "View"; 642 643 /** 644 * Used to mark a View that has no ID. 645 */ 646 public static final int NO_ID = -1; 647 648 /** 649 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 650 * calling setFlags. 651 */ 652 private static final int NOT_FOCUSABLE = 0x00000000; 653 654 /** 655 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 656 * setFlags. 657 */ 658 private static final int FOCUSABLE = 0x00000001; 659 660 /** 661 * Mask for use with setFlags indicating bits used for focus. 662 */ 663 private static final int FOCUSABLE_MASK = 0x00000001; 664 665 /** 666 * This view will adjust its padding to fit sytem windows (e.g. status bar) 667 */ 668 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 669 670 /** 671 * This view is visible. Use with {@link #setVisibility}. 672 */ 673 public static final int VISIBLE = 0x00000000; 674 675 /** 676 * This view is invisible, but it still takes up space for layout purposes. 677 * Use with {@link #setVisibility}. 678 */ 679 public static final int INVISIBLE = 0x00000004; 680 681 /** 682 * This view is invisible, and it doesn't take any space for layout 683 * purposes. Use with {@link #setVisibility}. 684 */ 685 public static final int GONE = 0x00000008; 686 687 /** 688 * Mask for use with setFlags indicating bits used for visibility. 689 * {@hide} 690 */ 691 static final int VISIBILITY_MASK = 0x0000000C; 692 693 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 694 695 /** 696 * This view is enabled. Intrepretation varies by subclass. 697 * Use with ENABLED_MASK when calling setFlags. 698 * {@hide} 699 */ 700 static final int ENABLED = 0x00000000; 701 702 /** 703 * This view is disabled. Intrepretation varies by subclass. 704 * Use with ENABLED_MASK when calling setFlags. 705 * {@hide} 706 */ 707 static final int DISABLED = 0x00000020; 708 709 /** 710 * Mask for use with setFlags indicating bits used for indicating whether 711 * this view is enabled 712 * {@hide} 713 */ 714 static final int ENABLED_MASK = 0x00000020; 715 716 /** 717 * This view won't draw. {@link #onDraw} won't be called and further 718 * optimizations 719 * will be performed. It is okay to have this flag set and a background. 720 * Use with DRAW_MASK when calling setFlags. 721 * {@hide} 722 */ 723 static final int WILL_NOT_DRAW = 0x00000080; 724 725 /** 726 * Mask for use with setFlags indicating bits used for indicating whether 727 * this view is will draw 728 * {@hide} 729 */ 730 static final int DRAW_MASK = 0x00000080; 731 732 /** 733 * <p>This view doesn't show scrollbars.</p> 734 * {@hide} 735 */ 736 static final int SCROLLBARS_NONE = 0x00000000; 737 738 /** 739 * <p>This view shows horizontal scrollbars.</p> 740 * {@hide} 741 */ 742 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 743 744 /** 745 * <p>This view shows vertical scrollbars.</p> 746 * {@hide} 747 */ 748 static final int SCROLLBARS_VERTICAL = 0x00000200; 749 750 /** 751 * <p>Mask for use with setFlags indicating bits used for indicating which 752 * scrollbars are enabled.</p> 753 * {@hide} 754 */ 755 static final int SCROLLBARS_MASK = 0x00000300; 756 757 /** 758 * Indicates that the view should filter touches when its window is obscured. 759 * Refer to the class comments for more information about this security feature. 760 * {@hide} 761 */ 762 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 763 764 // note flag value 0x00000800 is now available for next flags... 765 766 /** 767 * <p>This view doesn't show fading edges.</p> 768 * {@hide} 769 */ 770 static final int FADING_EDGE_NONE = 0x00000000; 771 772 /** 773 * <p>This view shows horizontal fading edges.</p> 774 * {@hide} 775 */ 776 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 777 778 /** 779 * <p>This view shows vertical fading edges.</p> 780 * {@hide} 781 */ 782 static final int FADING_EDGE_VERTICAL = 0x00002000; 783 784 /** 785 * <p>Mask for use with setFlags indicating bits used for indicating which 786 * fading edges are enabled.</p> 787 * {@hide} 788 */ 789 static final int FADING_EDGE_MASK = 0x00003000; 790 791 /** 792 * <p>Indicates this view can be clicked. When clickable, a View reacts 793 * to clicks by notifying the OnClickListener.<p> 794 * {@hide} 795 */ 796 static final int CLICKABLE = 0x00004000; 797 798 /** 799 * <p>Indicates this view is caching its drawing into a bitmap.</p> 800 * {@hide} 801 */ 802 static final int DRAWING_CACHE_ENABLED = 0x00008000; 803 804 /** 805 * <p>Indicates that no icicle should be saved for this view.<p> 806 * {@hide} 807 */ 808 static final int SAVE_DISABLED = 0x000010000; 809 810 /** 811 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 812 * property.</p> 813 * {@hide} 814 */ 815 static final int SAVE_DISABLED_MASK = 0x000010000; 816 817 /** 818 * <p>Indicates that no drawing cache should ever be created for this view.<p> 819 * {@hide} 820 */ 821 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 822 823 /** 824 * <p>Indicates this view can take / keep focus when int touch mode.</p> 825 * {@hide} 826 */ 827 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 828 829 /** 830 * <p>Enables low quality mode for the drawing cache.</p> 831 */ 832 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 833 834 /** 835 * <p>Enables high quality mode for the drawing cache.</p> 836 */ 837 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 838 839 /** 840 * <p>Enables automatic quality mode for the drawing cache.</p> 841 */ 842 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 843 844 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 845 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 846 }; 847 848 /** 849 * <p>Mask for use with setFlags indicating bits used for the cache 850 * quality property.</p> 851 * {@hide} 852 */ 853 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 854 855 /** 856 * <p> 857 * Indicates this view can be long clicked. When long clickable, a View 858 * reacts to long clicks by notifying the OnLongClickListener or showing a 859 * context menu. 860 * </p> 861 * {@hide} 862 */ 863 static final int LONG_CLICKABLE = 0x00200000; 864 865 /** 866 * <p>Indicates that this view gets its drawable states from its direct parent 867 * and ignores its original internal states.</p> 868 * 869 * @hide 870 */ 871 static final int DUPLICATE_PARENT_STATE = 0x00400000; 872 873 /** 874 * The scrollbar style to display the scrollbars inside the content area, 875 * without increasing the padding. The scrollbars will be overlaid with 876 * translucency on the view's content. 877 */ 878 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 879 880 /** 881 * The scrollbar style to display the scrollbars inside the padded area, 882 * increasing the padding of the view. The scrollbars will not overlap the 883 * content area of the view. 884 */ 885 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 886 887 /** 888 * The scrollbar style to display the scrollbars at the edge of the view, 889 * without increasing the padding. The scrollbars will be overlaid with 890 * translucency. 891 */ 892 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 893 894 /** 895 * The scrollbar style to display the scrollbars at the edge of the view, 896 * increasing the padding of the view. The scrollbars will only overlap the 897 * background, if any. 898 */ 899 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 900 901 /** 902 * Mask to check if the scrollbar style is overlay or inset. 903 * {@hide} 904 */ 905 static final int SCROLLBARS_INSET_MASK = 0x01000000; 906 907 /** 908 * Mask to check if the scrollbar style is inside or outside. 909 * {@hide} 910 */ 911 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 912 913 /** 914 * Mask for scrollbar style. 915 * {@hide} 916 */ 917 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 918 919 /** 920 * View flag indicating that the screen should remain on while the 921 * window containing this view is visible to the user. This effectively 922 * takes care of automatically setting the WindowManager's 923 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 924 */ 925 public static final int KEEP_SCREEN_ON = 0x04000000; 926 927 /** 928 * View flag indicating whether this view should have sound effects enabled 929 * for events such as clicking and touching. 930 */ 931 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 932 933 /** 934 * View flag indicating whether this view should have haptic feedback 935 * enabled for events such as long presses. 936 */ 937 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 938 939 /** 940 * <p>Indicates that the view hierarchy should stop saving state when 941 * it reaches this view. If state saving is initiated immediately at 942 * the view, it will be allowed. 943 * {@hide} 944 */ 945 static final int PARENT_SAVE_DISABLED = 0x20000000; 946 947 /** 948 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 949 * {@hide} 950 */ 951 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 952 953 /** 954 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 955 * should add all focusable Views regardless if they are focusable in touch mode. 956 */ 957 public static final int FOCUSABLES_ALL = 0x00000000; 958 959 /** 960 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 961 * should add only Views focusable in touch mode. 962 */ 963 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 964 965 /** 966 * Use with {@link #focusSearch}. Move focus to the previous selectable 967 * item. 968 */ 969 public static final int FOCUS_BACKWARD = 0x00000001; 970 971 /** 972 * Use with {@link #focusSearch}. Move focus to the next selectable 973 * item. 974 */ 975 public static final int FOCUS_FORWARD = 0x00000002; 976 977 /** 978 * Use with {@link #focusSearch}. Move focus to the left. 979 */ 980 public static final int FOCUS_LEFT = 0x00000011; 981 982 /** 983 * Use with {@link #focusSearch}. Move focus up. 984 */ 985 public static final int FOCUS_UP = 0x00000021; 986 987 /** 988 * Use with {@link #focusSearch}. Move focus to the right. 989 */ 990 public static final int FOCUS_RIGHT = 0x00000042; 991 992 /** 993 * Use with {@link #focusSearch}. Move focus down. 994 */ 995 public static final int FOCUS_DOWN = 0x00000082; 996 997 /** 998 * Bits of {@link #getMeasuredWidthAndState()} and 999 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1000 */ 1001 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1002 1003 /** 1004 * Bits of {@link #getMeasuredWidthAndState()} and 1005 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1006 */ 1007 public static final int MEASURED_STATE_MASK = 0xff000000; 1008 1009 /** 1010 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1011 * for functions that combine both width and height into a single int, 1012 * such as {@link #getMeasuredState()} and the childState argument of 1013 * {@link #resolveSizeAndState(int, int, int)}. 1014 */ 1015 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1016 1017 /** 1018 * Bit of {@link #getMeasuredWidthAndState()} and 1019 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1020 * is smaller that the space the view would like to have. 1021 */ 1022 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1023 1024 /** 1025 * Base View state sets 1026 */ 1027 // Singles 1028 /** 1029 * Indicates the view has no states set. States are used with 1030 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1031 * view depending on its state. 1032 * 1033 * @see android.graphics.drawable.Drawable 1034 * @see #getDrawableState() 1035 */ 1036 protected static final int[] EMPTY_STATE_SET; 1037 /** 1038 * Indicates the view is enabled. States are used with 1039 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1040 * view depending on its state. 1041 * 1042 * @see android.graphics.drawable.Drawable 1043 * @see #getDrawableState() 1044 */ 1045 protected static final int[] ENABLED_STATE_SET; 1046 /** 1047 * Indicates the view is focused. States are used with 1048 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1049 * view depending on its state. 1050 * 1051 * @see android.graphics.drawable.Drawable 1052 * @see #getDrawableState() 1053 */ 1054 protected static final int[] FOCUSED_STATE_SET; 1055 /** 1056 * Indicates the view is selected. States are used with 1057 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1058 * view depending on its state. 1059 * 1060 * @see android.graphics.drawable.Drawable 1061 * @see #getDrawableState() 1062 */ 1063 protected static final int[] SELECTED_STATE_SET; 1064 /** 1065 * Indicates the view is pressed. States are used with 1066 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1067 * view depending on its state. 1068 * 1069 * @see android.graphics.drawable.Drawable 1070 * @see #getDrawableState() 1071 * @hide 1072 */ 1073 protected static final int[] PRESSED_STATE_SET; 1074 /** 1075 * Indicates the view's window has focus. States are used with 1076 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1077 * view depending on its state. 1078 * 1079 * @see android.graphics.drawable.Drawable 1080 * @see #getDrawableState() 1081 */ 1082 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1083 // Doubles 1084 /** 1085 * Indicates the view is enabled and has the focus. 1086 * 1087 * @see #ENABLED_STATE_SET 1088 * @see #FOCUSED_STATE_SET 1089 */ 1090 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1091 /** 1092 * Indicates the view is enabled and selected. 1093 * 1094 * @see #ENABLED_STATE_SET 1095 * @see #SELECTED_STATE_SET 1096 */ 1097 protected static final int[] ENABLED_SELECTED_STATE_SET; 1098 /** 1099 * Indicates the view is enabled and that its window has focus. 1100 * 1101 * @see #ENABLED_STATE_SET 1102 * @see #WINDOW_FOCUSED_STATE_SET 1103 */ 1104 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1105 /** 1106 * Indicates the view is focused and selected. 1107 * 1108 * @see #FOCUSED_STATE_SET 1109 * @see #SELECTED_STATE_SET 1110 */ 1111 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1112 /** 1113 * Indicates the view has the focus and that its window has the focus. 1114 * 1115 * @see #FOCUSED_STATE_SET 1116 * @see #WINDOW_FOCUSED_STATE_SET 1117 */ 1118 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1119 /** 1120 * Indicates the view is selected and that its window has the focus. 1121 * 1122 * @see #SELECTED_STATE_SET 1123 * @see #WINDOW_FOCUSED_STATE_SET 1124 */ 1125 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1126 // Triples 1127 /** 1128 * Indicates the view is enabled, focused and selected. 1129 * 1130 * @see #ENABLED_STATE_SET 1131 * @see #FOCUSED_STATE_SET 1132 * @see #SELECTED_STATE_SET 1133 */ 1134 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1135 /** 1136 * Indicates the view is enabled, focused and its window has the focus. 1137 * 1138 * @see #ENABLED_STATE_SET 1139 * @see #FOCUSED_STATE_SET 1140 * @see #WINDOW_FOCUSED_STATE_SET 1141 */ 1142 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1143 /** 1144 * Indicates the view is enabled, selected and its window has the focus. 1145 * 1146 * @see #ENABLED_STATE_SET 1147 * @see #SELECTED_STATE_SET 1148 * @see #WINDOW_FOCUSED_STATE_SET 1149 */ 1150 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1151 /** 1152 * Indicates the view is focused, selected and its window has the focus. 1153 * 1154 * @see #FOCUSED_STATE_SET 1155 * @see #SELECTED_STATE_SET 1156 * @see #WINDOW_FOCUSED_STATE_SET 1157 */ 1158 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1159 /** 1160 * Indicates the view is enabled, focused, selected and its window 1161 * has the focus. 1162 * 1163 * @see #ENABLED_STATE_SET 1164 * @see #FOCUSED_STATE_SET 1165 * @see #SELECTED_STATE_SET 1166 * @see #WINDOW_FOCUSED_STATE_SET 1167 */ 1168 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1169 /** 1170 * Indicates the view is pressed and its window has the focus. 1171 * 1172 * @see #PRESSED_STATE_SET 1173 * @see #WINDOW_FOCUSED_STATE_SET 1174 */ 1175 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1176 /** 1177 * Indicates the view is pressed and selected. 1178 * 1179 * @see #PRESSED_STATE_SET 1180 * @see #SELECTED_STATE_SET 1181 */ 1182 protected static final int[] PRESSED_SELECTED_STATE_SET; 1183 /** 1184 * Indicates the view is pressed, selected and its window has the focus. 1185 * 1186 * @see #PRESSED_STATE_SET 1187 * @see #SELECTED_STATE_SET 1188 * @see #WINDOW_FOCUSED_STATE_SET 1189 */ 1190 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1191 /** 1192 * Indicates the view is pressed and focused. 1193 * 1194 * @see #PRESSED_STATE_SET 1195 * @see #FOCUSED_STATE_SET 1196 */ 1197 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1198 /** 1199 * Indicates the view is pressed, focused and its window has the focus. 1200 * 1201 * @see #PRESSED_STATE_SET 1202 * @see #FOCUSED_STATE_SET 1203 * @see #WINDOW_FOCUSED_STATE_SET 1204 */ 1205 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1206 /** 1207 * Indicates the view is pressed, focused and selected. 1208 * 1209 * @see #PRESSED_STATE_SET 1210 * @see #SELECTED_STATE_SET 1211 * @see #FOCUSED_STATE_SET 1212 */ 1213 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1214 /** 1215 * Indicates the view is pressed, focused, selected and its window has the focus. 1216 * 1217 * @see #PRESSED_STATE_SET 1218 * @see #FOCUSED_STATE_SET 1219 * @see #SELECTED_STATE_SET 1220 * @see #WINDOW_FOCUSED_STATE_SET 1221 */ 1222 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1223 /** 1224 * Indicates the view is pressed and enabled. 1225 * 1226 * @see #PRESSED_STATE_SET 1227 * @see #ENABLED_STATE_SET 1228 */ 1229 protected static final int[] PRESSED_ENABLED_STATE_SET; 1230 /** 1231 * Indicates the view is pressed, enabled and its window has the focus. 1232 * 1233 * @see #PRESSED_STATE_SET 1234 * @see #ENABLED_STATE_SET 1235 * @see #WINDOW_FOCUSED_STATE_SET 1236 */ 1237 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1238 /** 1239 * Indicates the view is pressed, enabled and selected. 1240 * 1241 * @see #PRESSED_STATE_SET 1242 * @see #ENABLED_STATE_SET 1243 * @see #SELECTED_STATE_SET 1244 */ 1245 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1246 /** 1247 * Indicates the view is pressed, enabled, selected and its window has the 1248 * focus. 1249 * 1250 * @see #PRESSED_STATE_SET 1251 * @see #ENABLED_STATE_SET 1252 * @see #SELECTED_STATE_SET 1253 * @see #WINDOW_FOCUSED_STATE_SET 1254 */ 1255 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1256 /** 1257 * Indicates the view is pressed, enabled and focused. 1258 * 1259 * @see #PRESSED_STATE_SET 1260 * @see #ENABLED_STATE_SET 1261 * @see #FOCUSED_STATE_SET 1262 */ 1263 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1264 /** 1265 * Indicates the view is pressed, enabled, focused and its window has the 1266 * focus. 1267 * 1268 * @see #PRESSED_STATE_SET 1269 * @see #ENABLED_STATE_SET 1270 * @see #FOCUSED_STATE_SET 1271 * @see #WINDOW_FOCUSED_STATE_SET 1272 */ 1273 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1274 /** 1275 * Indicates the view is pressed, enabled, focused and selected. 1276 * 1277 * @see #PRESSED_STATE_SET 1278 * @see #ENABLED_STATE_SET 1279 * @see #SELECTED_STATE_SET 1280 * @see #FOCUSED_STATE_SET 1281 */ 1282 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1283 /** 1284 * Indicates the view is pressed, enabled, focused, selected and its window 1285 * has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #ENABLED_STATE_SET 1289 * @see #SELECTED_STATE_SET 1290 * @see #FOCUSED_STATE_SET 1291 * @see #WINDOW_FOCUSED_STATE_SET 1292 */ 1293 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1294 1295 /** 1296 * The order here is very important to {@link #getDrawableState()} 1297 */ 1298 private static final int[][] VIEW_STATE_SETS; 1299 1300 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1301 static final int VIEW_STATE_SELECTED = 1 << 1; 1302 static final int VIEW_STATE_FOCUSED = 1 << 2; 1303 static final int VIEW_STATE_ENABLED = 1 << 3; 1304 static final int VIEW_STATE_PRESSED = 1 << 4; 1305 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1306 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1307 1308 static final int[] VIEW_STATE_IDS = new int[] { 1309 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1310 R.attr.state_selected, VIEW_STATE_SELECTED, 1311 R.attr.state_focused, VIEW_STATE_FOCUSED, 1312 R.attr.state_enabled, VIEW_STATE_ENABLED, 1313 R.attr.state_pressed, VIEW_STATE_PRESSED, 1314 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1315 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1316 }; 1317 1318 static { 1319 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1320 throw new IllegalStateException( 1321 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1322 } 1323 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1324 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1325 int viewState = R.styleable.ViewDrawableStates[i]; 1326 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1327 if (VIEW_STATE_IDS[j] == viewState) { 1328 orderedIds[i * 2] = viewState; 1329 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1330 } 1331 } 1332 } 1333 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1334 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1335 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1336 int numBits = Integer.bitCount(i); 1337 int[] set = new int[numBits]; 1338 int pos = 0; 1339 for (int j = 0; j < orderedIds.length; j += 2) { 1340 if ((i & orderedIds[j+1]) != 0) { 1341 set[pos++] = orderedIds[j]; 1342 } 1343 } 1344 VIEW_STATE_SETS[i] = set; 1345 } 1346 1347 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1348 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1349 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1350 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1351 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1352 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1353 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1354 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1355 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1356 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1357 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1358 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1359 | VIEW_STATE_FOCUSED]; 1360 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1361 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1362 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1363 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1364 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1365 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1366 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1367 | VIEW_STATE_ENABLED]; 1368 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1369 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1370 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1371 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1372 | VIEW_STATE_ENABLED]; 1373 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1374 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1375 | VIEW_STATE_ENABLED]; 1376 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1377 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1378 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1379 1380 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1381 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1382 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1383 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1384 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1385 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1386 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1387 | VIEW_STATE_PRESSED]; 1388 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1389 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1390 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1391 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1392 | VIEW_STATE_PRESSED]; 1393 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1394 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1395 | VIEW_STATE_PRESSED]; 1396 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1397 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1398 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1399 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1400 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1401 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1402 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1403 | VIEW_STATE_PRESSED]; 1404 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1405 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1406 | VIEW_STATE_PRESSED]; 1407 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1408 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1409 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1410 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1412 | VIEW_STATE_PRESSED]; 1413 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1415 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1416 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1418 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1419 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1420 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1421 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1422 | VIEW_STATE_PRESSED]; 1423 } 1424 1425 /** 1426 * Used by views that contain lists of items. This state indicates that 1427 * the view is showing the last item. 1428 * @hide 1429 */ 1430 protected static final int[] LAST_STATE_SET = {R.attr.state_last}; 1431 /** 1432 * Used by views that contain lists of items. This state indicates that 1433 * the view is showing the first item. 1434 * @hide 1435 */ 1436 protected static final int[] FIRST_STATE_SET = {R.attr.state_first}; 1437 /** 1438 * Used by views that contain lists of items. This state indicates that 1439 * the view is showing the middle item. 1440 * @hide 1441 */ 1442 protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle}; 1443 /** 1444 * Used by views that contain lists of items. This state indicates that 1445 * the view is showing only one item. 1446 * @hide 1447 */ 1448 protected static final int[] SINGLE_STATE_SET = {R.attr.state_single}; 1449 /** 1450 * Used by views that contain lists of items. This state indicates that 1451 * the view is pressed and showing the last item. 1452 * @hide 1453 */ 1454 protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed}; 1455 /** 1456 * Used by views that contain lists of items. This state indicates that 1457 * the view is pressed and showing the first item. 1458 * @hide 1459 */ 1460 protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed}; 1461 /** 1462 * Used by views that contain lists of items. This state indicates that 1463 * the view is pressed and showing the middle item. 1464 * @hide 1465 */ 1466 protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed}; 1467 /** 1468 * Used by views that contain lists of items. This state indicates that 1469 * the view is pressed and showing only one item. 1470 * @hide 1471 */ 1472 protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed}; 1473 1474 /** 1475 * Temporary Rect currently for use in setBackground(). This will probably 1476 * be extended in the future to hold our own class with more than just 1477 * a Rect. :) 1478 */ 1479 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1480 1481 /** 1482 * Map used to store views' tags. 1483 */ 1484 private static WeakHashMap<View, SparseArray<Object>> sTags; 1485 1486 /** 1487 * Lock used to access sTags. 1488 */ 1489 private static final Object sTagsLock = new Object(); 1490 1491 /** 1492 * The animation currently associated with this view. 1493 * @hide 1494 */ 1495 protected Animation mCurrentAnimation = null; 1496 1497 /** 1498 * Width as measured during measure pass. 1499 * {@hide} 1500 */ 1501 @ViewDebug.ExportedProperty(category = "measurement") 1502 /*package*/ int mMeasuredWidth; 1503 1504 /** 1505 * Height as measured during measure pass. 1506 * {@hide} 1507 */ 1508 @ViewDebug.ExportedProperty(category = "measurement") 1509 /*package*/ int mMeasuredHeight; 1510 1511 /** 1512 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1513 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1514 * its display list. This flag, used only when hw accelerated, allows us to clear the 1515 * flag while retaining this information until it's needed (at getDisplayList() time and 1516 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1517 * 1518 * {@hide} 1519 */ 1520 boolean mRecreateDisplayList = false; 1521 1522 /** 1523 * The view's identifier. 1524 * {@hide} 1525 * 1526 * @see #setId(int) 1527 * @see #getId() 1528 */ 1529 @ViewDebug.ExportedProperty(resolveId = true) 1530 int mID = NO_ID; 1531 1532 /** 1533 * The view's tag. 1534 * {@hide} 1535 * 1536 * @see #setTag(Object) 1537 * @see #getTag() 1538 */ 1539 protected Object mTag; 1540 1541 // for mPrivateFlags: 1542 /** {@hide} */ 1543 static final int WANTS_FOCUS = 0x00000001; 1544 /** {@hide} */ 1545 static final int FOCUSED = 0x00000002; 1546 /** {@hide} */ 1547 static final int SELECTED = 0x00000004; 1548 /** {@hide} */ 1549 static final int IS_ROOT_NAMESPACE = 0x00000008; 1550 /** {@hide} */ 1551 static final int HAS_BOUNDS = 0x00000010; 1552 /** {@hide} */ 1553 static final int DRAWN = 0x00000020; 1554 /** 1555 * When this flag is set, this view is running an animation on behalf of its 1556 * children and should therefore not cancel invalidate requests, even if they 1557 * lie outside of this view's bounds. 1558 * 1559 * {@hide} 1560 */ 1561 static final int DRAW_ANIMATION = 0x00000040; 1562 /** {@hide} */ 1563 static final int SKIP_DRAW = 0x00000080; 1564 /** {@hide} */ 1565 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1566 /** {@hide} */ 1567 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1568 /** {@hide} */ 1569 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1570 /** {@hide} */ 1571 static final int MEASURED_DIMENSION_SET = 0x00000800; 1572 /** {@hide} */ 1573 static final int FORCE_LAYOUT = 0x00001000; 1574 /** {@hide} */ 1575 static final int LAYOUT_REQUIRED = 0x00002000; 1576 1577 private static final int PRESSED = 0x00004000; 1578 1579 /** {@hide} */ 1580 static final int DRAWING_CACHE_VALID = 0x00008000; 1581 /** 1582 * Flag used to indicate that this view should be drawn once more (and only once 1583 * more) after its animation has completed. 1584 * {@hide} 1585 */ 1586 static final int ANIMATION_STARTED = 0x00010000; 1587 1588 private static final int SAVE_STATE_CALLED = 0x00020000; 1589 1590 /** 1591 * Indicates that the View returned true when onSetAlpha() was called and that 1592 * the alpha must be restored. 1593 * {@hide} 1594 */ 1595 static final int ALPHA_SET = 0x00040000; 1596 1597 /** 1598 * Set by {@link #setScrollContainer(boolean)}. 1599 */ 1600 static final int SCROLL_CONTAINER = 0x00080000; 1601 1602 /** 1603 * Set by {@link #setScrollContainer(boolean)}. 1604 */ 1605 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1606 1607 /** 1608 * View flag indicating whether this view was invalidated (fully or partially.) 1609 * 1610 * @hide 1611 */ 1612 static final int DIRTY = 0x00200000; 1613 1614 /** 1615 * View flag indicating whether this view was invalidated by an opaque 1616 * invalidate request. 1617 * 1618 * @hide 1619 */ 1620 static final int DIRTY_OPAQUE = 0x00400000; 1621 1622 /** 1623 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1624 * 1625 * @hide 1626 */ 1627 static final int DIRTY_MASK = 0x00600000; 1628 1629 /** 1630 * Indicates whether the background is opaque. 1631 * 1632 * @hide 1633 */ 1634 static final int OPAQUE_BACKGROUND = 0x00800000; 1635 1636 /** 1637 * Indicates whether the scrollbars are opaque. 1638 * 1639 * @hide 1640 */ 1641 static final int OPAQUE_SCROLLBARS = 0x01000000; 1642 1643 /** 1644 * Indicates whether the view is opaque. 1645 * 1646 * @hide 1647 */ 1648 static final int OPAQUE_MASK = 0x01800000; 1649 1650 /** 1651 * Indicates a prepressed state; 1652 * the short time between ACTION_DOWN and recognizing 1653 * a 'real' press. Prepressed is used to recognize quick taps 1654 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1655 * 1656 * @hide 1657 */ 1658 private static final int PREPRESSED = 0x02000000; 1659 1660 /** 1661 * Indicates whether the view is temporarily detached. 1662 * 1663 * @hide 1664 */ 1665 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1666 1667 /** 1668 * Indicates that we should awaken scroll bars once attached 1669 * 1670 * @hide 1671 */ 1672 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1673 1674 /** 1675 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1676 * for transform operations 1677 * 1678 * @hide 1679 */ 1680 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1681 1682 /** {@hide} */ 1683 static final int ACTIVATED = 0x40000000; 1684 1685 /** 1686 * Indicates that this view was specifically invalidated, not just dirtied because some 1687 * child view was invalidated. The flag is used to determine when we need to recreate 1688 * a view's display list (as opposed to just returning a reference to its existing 1689 * display list). 1690 * 1691 * @hide 1692 */ 1693 static final int INVALIDATED = 0x80000000; 1694 1695 /** 1696 * Always allow a user to over-scroll this view, provided it is a 1697 * view that can scroll. 1698 * 1699 * @see #getOverScrollMode() 1700 * @see #setOverScrollMode(int) 1701 */ 1702 public static final int OVER_SCROLL_ALWAYS = 0; 1703 1704 /** 1705 * Allow a user to over-scroll this view only if the content is large 1706 * enough to meaningfully scroll, provided it is a view that can scroll. 1707 * 1708 * @see #getOverScrollMode() 1709 * @see #setOverScrollMode(int) 1710 */ 1711 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1712 1713 /** 1714 * Never allow a user to over-scroll this view. 1715 * 1716 * @see #getOverScrollMode() 1717 * @see #setOverScrollMode(int) 1718 */ 1719 public static final int OVER_SCROLL_NEVER = 2; 1720 1721 /** 1722 * View has requested the status bar to be visible (the default). 1723 * 1724 * @see setSystemUiVisibility 1725 */ 1726 public static final int STATUS_BAR_VISIBLE = 0; 1727 1728 /** 1729 * View has requested the status bar to be visible (the default). 1730 * 1731 * @see setSystemUiVisibility 1732 */ 1733 public static final int STATUS_BAR_HIDDEN = 0x00000001; 1734 1735 /** 1736 * Controls the over-scroll mode for this view. 1737 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1738 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1739 * and {@link #OVER_SCROLL_NEVER}. 1740 */ 1741 private int mOverScrollMode; 1742 1743 /** 1744 * The parent this view is attached to. 1745 * {@hide} 1746 * 1747 * @see #getParent() 1748 */ 1749 protected ViewParent mParent; 1750 1751 /** 1752 * {@hide} 1753 */ 1754 AttachInfo mAttachInfo; 1755 1756 /** 1757 * {@hide} 1758 */ 1759 @ViewDebug.ExportedProperty(flagMapping = { 1760 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1761 name = "FORCE_LAYOUT"), 1762 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1763 name = "LAYOUT_REQUIRED"), 1764 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1765 name = "DRAWING_CACHE_INVALID", outputIf = false), 1766 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1767 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1768 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1769 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1770 }) 1771 int mPrivateFlags; 1772 1773 /** 1774 * This view's request for the visibility of the status bar. 1775 * @hide 1776 */ 1777 int mSystemUiVisibility; 1778 1779 /** 1780 * Count of how many windows this view has been attached to. 1781 */ 1782 int mWindowAttachCount; 1783 1784 /** 1785 * The layout parameters associated with this view and used by the parent 1786 * {@link android.view.ViewGroup} to determine how this view should be 1787 * laid out. 1788 * {@hide} 1789 */ 1790 protected ViewGroup.LayoutParams mLayoutParams; 1791 1792 /** 1793 * The view flags hold various views states. 1794 * {@hide} 1795 */ 1796 @ViewDebug.ExportedProperty 1797 int mViewFlags; 1798 1799 /** 1800 * The transform matrix for the View. This transform is calculated internally 1801 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1802 * is used by default. Do *not* use this variable directly; instead call 1803 * getMatrix(), which will automatically recalculate the matrix if necessary 1804 * to get the correct matrix based on the latest rotation and scale properties. 1805 */ 1806 private final Matrix mMatrix = new Matrix(); 1807 1808 /** 1809 * The transform matrix for the View. This transform is calculated internally 1810 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1811 * is used by default. Do *not* use this variable directly; instead call 1812 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1813 * to get the correct matrix based on the latest rotation and scale properties. 1814 */ 1815 private Matrix mInverseMatrix; 1816 1817 /** 1818 * An internal variable that tracks whether we need to recalculate the 1819 * transform matrix, based on whether the rotation or scaleX/Y properties 1820 * have changed since the matrix was last calculated. 1821 */ 1822 private boolean mMatrixDirty = false; 1823 1824 /** 1825 * An internal variable that tracks whether we need to recalculate the 1826 * transform matrix, based on whether the rotation or scaleX/Y properties 1827 * have changed since the matrix was last calculated. 1828 */ 1829 private boolean mInverseMatrixDirty = true; 1830 1831 /** 1832 * A variable that tracks whether we need to recalculate the 1833 * transform matrix, based on whether the rotation or scaleX/Y properties 1834 * have changed since the matrix was last calculated. This variable 1835 * is only valid after a call to updateMatrix() or to a function that 1836 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1837 */ 1838 private boolean mMatrixIsIdentity = true; 1839 1840 /** 1841 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1842 */ 1843 private Camera mCamera = null; 1844 1845 /** 1846 * This matrix is used when computing the matrix for 3D rotations. 1847 */ 1848 private Matrix matrix3D = null; 1849 1850 /** 1851 * These prev values are used to recalculate a centered pivot point when necessary. The 1852 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1853 * set), so thes values are only used then as well. 1854 */ 1855 private int mPrevWidth = -1; 1856 private int mPrevHeight = -1; 1857 1858 private boolean mLastIsOpaque; 1859 1860 /** 1861 * Convenience value to check for float values that are close enough to zero to be considered 1862 * zero. 1863 */ 1864 private static final float NONZERO_EPSILON = .001f; 1865 1866 /** 1867 * The degrees rotation around the vertical axis through the pivot point. 1868 */ 1869 @ViewDebug.ExportedProperty 1870 private float mRotationY = 0f; 1871 1872 /** 1873 * The degrees rotation around the horizontal axis through the pivot point. 1874 */ 1875 @ViewDebug.ExportedProperty 1876 private float mRotationX = 0f; 1877 1878 /** 1879 * The degrees rotation around the pivot point. 1880 */ 1881 @ViewDebug.ExportedProperty 1882 private float mRotation = 0f; 1883 1884 /** 1885 * The amount of translation of the object away from its left property (post-layout). 1886 */ 1887 @ViewDebug.ExportedProperty 1888 private float mTranslationX = 0f; 1889 1890 /** 1891 * The amount of translation of the object away from its top property (post-layout). 1892 */ 1893 @ViewDebug.ExportedProperty 1894 private float mTranslationY = 0f; 1895 1896 /** 1897 * The amount of scale in the x direction around the pivot point. A 1898 * value of 1 means no scaling is applied. 1899 */ 1900 @ViewDebug.ExportedProperty 1901 private float mScaleX = 1f; 1902 1903 /** 1904 * The amount of scale in the y direction around the pivot point. A 1905 * value of 1 means no scaling is applied. 1906 */ 1907 @ViewDebug.ExportedProperty 1908 private float mScaleY = 1f; 1909 1910 /** 1911 * The amount of scale in the x direction around the pivot point. A 1912 * value of 1 means no scaling is applied. 1913 */ 1914 @ViewDebug.ExportedProperty 1915 private float mPivotX = 0f; 1916 1917 /** 1918 * The amount of scale in the y direction around the pivot point. A 1919 * value of 1 means no scaling is applied. 1920 */ 1921 @ViewDebug.ExportedProperty 1922 private float mPivotY = 0f; 1923 1924 /** 1925 * The opacity of the View. This is a value from 0 to 1, where 0 means 1926 * completely transparent and 1 means completely opaque. 1927 */ 1928 @ViewDebug.ExportedProperty 1929 private float mAlpha = 1f; 1930 1931 /** 1932 * The distance in pixels from the left edge of this view's parent 1933 * to the left edge of this view. 1934 * {@hide} 1935 */ 1936 @ViewDebug.ExportedProperty(category = "layout") 1937 protected int mLeft; 1938 /** 1939 * The distance in pixels from the left edge of this view's parent 1940 * to the right edge of this view. 1941 * {@hide} 1942 */ 1943 @ViewDebug.ExportedProperty(category = "layout") 1944 protected int mRight; 1945 /** 1946 * The distance in pixels from the top edge of this view's parent 1947 * to the top edge of this view. 1948 * {@hide} 1949 */ 1950 @ViewDebug.ExportedProperty(category = "layout") 1951 protected int mTop; 1952 /** 1953 * The distance in pixels from the top edge of this view's parent 1954 * to the bottom edge of this view. 1955 * {@hide} 1956 */ 1957 @ViewDebug.ExportedProperty(category = "layout") 1958 protected int mBottom; 1959 1960 /** 1961 * The offset, in pixels, by which the content of this view is scrolled 1962 * horizontally. 1963 * {@hide} 1964 */ 1965 @ViewDebug.ExportedProperty(category = "scrolling") 1966 protected int mScrollX; 1967 /** 1968 * The offset, in pixels, by which the content of this view is scrolled 1969 * vertically. 1970 * {@hide} 1971 */ 1972 @ViewDebug.ExportedProperty(category = "scrolling") 1973 protected int mScrollY; 1974 1975 /** 1976 * The left padding in pixels, that is the distance in pixels between the 1977 * left edge of this view and the left edge of its content. 1978 * {@hide} 1979 */ 1980 @ViewDebug.ExportedProperty(category = "padding") 1981 protected int mPaddingLeft; 1982 /** 1983 * The right padding in pixels, that is the distance in pixels between the 1984 * right edge of this view and the right edge of its content. 1985 * {@hide} 1986 */ 1987 @ViewDebug.ExportedProperty(category = "padding") 1988 protected int mPaddingRight; 1989 /** 1990 * The top padding in pixels, that is the distance in pixels between the 1991 * top edge of this view and the top edge of its content. 1992 * {@hide} 1993 */ 1994 @ViewDebug.ExportedProperty(category = "padding") 1995 protected int mPaddingTop; 1996 /** 1997 * The bottom padding in pixels, that is the distance in pixels between the 1998 * bottom edge of this view and the bottom edge of its content. 1999 * {@hide} 2000 */ 2001 @ViewDebug.ExportedProperty(category = "padding") 2002 protected int mPaddingBottom; 2003 2004 /** 2005 * Briefly describes the view and is primarily used for accessibility support. 2006 */ 2007 private CharSequence mContentDescription; 2008 2009 /** 2010 * Cache the paddingRight set by the user to append to the scrollbar's size. 2011 */ 2012 @ViewDebug.ExportedProperty(category = "padding") 2013 int mUserPaddingRight; 2014 2015 /** 2016 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2017 */ 2018 @ViewDebug.ExportedProperty(category = "padding") 2019 int mUserPaddingBottom; 2020 2021 /** 2022 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2023 */ 2024 @ViewDebug.ExportedProperty(category = "padding") 2025 int mUserPaddingLeft; 2026 2027 /** 2028 * @hide 2029 */ 2030 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2031 /** 2032 * @hide 2033 */ 2034 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2035 2036 private Resources mResources = null; 2037 2038 private Drawable mBGDrawable; 2039 2040 private int mBackgroundResource; 2041 private boolean mBackgroundSizeChanged; 2042 2043 /** 2044 * Listener used to dispatch focus change events. 2045 * This field should be made private, so it is hidden from the SDK. 2046 * {@hide} 2047 */ 2048 protected OnFocusChangeListener mOnFocusChangeListener; 2049 2050 /** 2051 * Listeners for layout change events. 2052 */ 2053 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2054 2055 /** 2056 * Listener used to dispatch click events. 2057 * This field should be made private, so it is hidden from the SDK. 2058 * {@hide} 2059 */ 2060 protected OnClickListener mOnClickListener; 2061 2062 /** 2063 * Listener used to dispatch long click events. 2064 * This field should be made private, so it is hidden from the SDK. 2065 * {@hide} 2066 */ 2067 protected OnLongClickListener mOnLongClickListener; 2068 2069 /** 2070 * Listener used to build the context menu. 2071 * This field should be made private, so it is hidden from the SDK. 2072 * {@hide} 2073 */ 2074 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2075 2076 private OnKeyListener mOnKeyListener; 2077 2078 private OnTouchListener mOnTouchListener; 2079 2080 private OnDragListener mOnDragListener; 2081 2082 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2083 2084 /** 2085 * The application environment this view lives in. 2086 * This field should be made private, so it is hidden from the SDK. 2087 * {@hide} 2088 */ 2089 protected Context mContext; 2090 2091 private ScrollabilityCache mScrollCache; 2092 2093 private int[] mDrawableState = null; 2094 2095 private Bitmap mDrawingCache; 2096 private Bitmap mUnscaledDrawingCache; 2097 private DisplayList mDisplayList; 2098 private HardwareLayer mHardwareLayer; 2099 2100 /** 2101 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2102 * the user may specify which view to go to next. 2103 */ 2104 private int mNextFocusLeftId = View.NO_ID; 2105 2106 /** 2107 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2108 * the user may specify which view to go to next. 2109 */ 2110 private int mNextFocusRightId = View.NO_ID; 2111 2112 /** 2113 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2114 * the user may specify which view to go to next. 2115 */ 2116 private int mNextFocusUpId = View.NO_ID; 2117 2118 /** 2119 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2120 * the user may specify which view to go to next. 2121 */ 2122 private int mNextFocusDownId = View.NO_ID; 2123 2124 /** 2125 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2126 * the user may specify which view to go to next. 2127 */ 2128 int mNextFocusForwardId = View.NO_ID; 2129 2130 private CheckForLongPress mPendingCheckForLongPress; 2131 private CheckForTap mPendingCheckForTap = null; 2132 private PerformClick mPerformClick; 2133 2134 private UnsetPressedState mUnsetPressedState; 2135 2136 /** 2137 * Whether the long press's action has been invoked. The tap's action is invoked on the 2138 * up event while a long press is invoked as soon as the long press duration is reached, so 2139 * a long press could be performed before the tap is checked, in which case the tap's action 2140 * should not be invoked. 2141 */ 2142 private boolean mHasPerformedLongPress; 2143 2144 /** 2145 * The minimum height of the view. We'll try our best to have the height 2146 * of this view to at least this amount. 2147 */ 2148 @ViewDebug.ExportedProperty(category = "measurement") 2149 private int mMinHeight; 2150 2151 /** 2152 * The minimum width of the view. We'll try our best to have the width 2153 * of this view to at least this amount. 2154 */ 2155 @ViewDebug.ExportedProperty(category = "measurement") 2156 private int mMinWidth; 2157 2158 /** 2159 * The delegate to handle touch events that are physically in this view 2160 * but should be handled by another view. 2161 */ 2162 private TouchDelegate mTouchDelegate = null; 2163 2164 /** 2165 * Solid color to use as a background when creating the drawing cache. Enables 2166 * the cache to use 16 bit bitmaps instead of 32 bit. 2167 */ 2168 private int mDrawingCacheBackgroundColor = 0; 2169 2170 /** 2171 * Special tree observer used when mAttachInfo is null. 2172 */ 2173 private ViewTreeObserver mFloatingTreeObserver; 2174 2175 /** 2176 * Cache the touch slop from the context that created the view. 2177 */ 2178 private int mTouchSlop; 2179 2180 /** 2181 * Cache drag/drop state 2182 * 2183 */ 2184 boolean mCanAcceptDrop; 2185 2186 /** 2187 * Flag indicating that a drag can cross window boundaries 2188 * @hide 2189 */ 2190 public static final int DRAG_FLAG_GLOBAL = 1; 2191 2192 /** 2193 * Position of the vertical scroll bar. 2194 */ 2195 private int mVerticalScrollbarPosition; 2196 2197 /** 2198 * Position the scroll bar at the default position as determined by the system. 2199 */ 2200 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2201 2202 /** 2203 * Position the scroll bar along the left edge. 2204 */ 2205 public static final int SCROLLBAR_POSITION_LEFT = 1; 2206 2207 /** 2208 * Position the scroll bar along the right edge. 2209 */ 2210 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2211 2212 /** 2213 * Indicates that the view does not have a layer. 2214 * 2215 * @see #getLayerType() 2216 * @see #setLayerType(int, android.graphics.Paint) 2217 * @see #LAYER_TYPE_SOFTWARE 2218 * @see #LAYER_TYPE_HARDWARE 2219 */ 2220 public static final int LAYER_TYPE_NONE = 0; 2221 2222 /** 2223 * <p>Indicates that the view has a software layer. A software layer is backed 2224 * by a bitmap and causes the view to be rendered using Android's software 2225 * rendering pipeline, even if hardware acceleration is enabled.</p> 2226 * 2227 * <p>Software layers have various usages:</p> 2228 * <p>When the application is not using hardware acceleration, a software layer 2229 * is useful to apply a specific color filter and/or blending mode and/or 2230 * translucency to a view and all its children.</p> 2231 * <p>When the application is using hardware acceleration, a software layer 2232 * is useful to render drawing primitives not supported by the hardware 2233 * accelerated pipeline. It can also be used to cache a complex view tree 2234 * into a texture and reduce the complexity of drawing operations. For instance, 2235 * when animating a complex view tree with a translation, a software layer can 2236 * be used to render the view tree only once.</p> 2237 * <p>Software layers should be avoided when the affected view tree updates 2238 * often. Every update will require to re-render the software layer, which can 2239 * potentially be slow (particularly when hardware acceleration is turned on 2240 * since the layer will have to be uploaded into a hardware texture after every 2241 * update.)</p> 2242 * 2243 * @see #getLayerType() 2244 * @see #setLayerType(int, android.graphics.Paint) 2245 * @see #LAYER_TYPE_NONE 2246 * @see #LAYER_TYPE_HARDWARE 2247 */ 2248 public static final int LAYER_TYPE_SOFTWARE = 1; 2249 2250 /** 2251 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2252 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2253 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2254 * rendering pipeline, but only if hardware acceleration is turned on for the 2255 * view hierarchy. When hardware acceleration is turned off, hardware layers 2256 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2257 * 2258 * <p>A hardware layer is useful to apply a specific color filter and/or 2259 * blending mode and/or translucency to a view and all its children.</p> 2260 * <p>A hardware layer can be used to cache a complex view tree into a 2261 * texture and reduce the complexity of drawing operations. For instance, 2262 * when animating a complex view tree with a translation, a hardware layer can 2263 * be used to render the view tree only once.</p> 2264 * <p>A hardware layer can also be used to increase the rendering quality when 2265 * rotation transformations are applied on a view. It can also be used to 2266 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2267 * 2268 * @see #getLayerType() 2269 * @see #setLayerType(int, android.graphics.Paint) 2270 * @see #LAYER_TYPE_NONE 2271 * @see #LAYER_TYPE_SOFTWARE 2272 */ 2273 public static final int LAYER_TYPE_HARDWARE = 2; 2274 2275 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2276 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2277 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2278 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2279 }) 2280 int mLayerType = LAYER_TYPE_NONE; 2281 Paint mLayerPaint; 2282 2283 /** 2284 * Simple constructor to use when creating a view from code. 2285 * 2286 * @param context The Context the view is running in, through which it can 2287 * access the current theme, resources, etc. 2288 */ 2289 public View(Context context) { 2290 mContext = context; 2291 mResources = context != null ? context.getResources() : null; 2292 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2293 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2294 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2295 } 2296 2297 /** 2298 * Constructor that is called when inflating a view from XML. This is called 2299 * when a view is being constructed from an XML file, supplying attributes 2300 * that were specified in the XML file. This version uses a default style of 2301 * 0, so the only attribute values applied are those in the Context's Theme 2302 * and the given AttributeSet. 2303 * 2304 * <p> 2305 * The method onFinishInflate() will be called after all children have been 2306 * added. 2307 * 2308 * @param context The Context the view is running in, through which it can 2309 * access the current theme, resources, etc. 2310 * @param attrs The attributes of the XML tag that is inflating the view. 2311 * @see #View(Context, AttributeSet, int) 2312 */ 2313 public View(Context context, AttributeSet attrs) { 2314 this(context, attrs, 0); 2315 } 2316 2317 /** 2318 * Perform inflation from XML and apply a class-specific base style. This 2319 * constructor of View allows subclasses to use their own base style when 2320 * they are inflating. For example, a Button class's constructor would call 2321 * this version of the super class constructor and supply 2322 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2323 * the theme's button style to modify all of the base view attributes (in 2324 * particular its background) as well as the Button class's attributes. 2325 * 2326 * @param context The Context the view is running in, through which it can 2327 * access the current theme, resources, etc. 2328 * @param attrs The attributes of the XML tag that is inflating the view. 2329 * @param defStyle The default style to apply to this view. If 0, no style 2330 * will be applied (beyond what is included in the theme). This may 2331 * either be an attribute resource, whose value will be retrieved 2332 * from the current theme, or an explicit style resource. 2333 * @see #View(Context, AttributeSet) 2334 */ 2335 public View(Context context, AttributeSet attrs, int defStyle) { 2336 this(context); 2337 2338 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2339 defStyle, 0); 2340 2341 Drawable background = null; 2342 2343 int leftPadding = -1; 2344 int topPadding = -1; 2345 int rightPadding = -1; 2346 int bottomPadding = -1; 2347 2348 int padding = -1; 2349 2350 int viewFlagValues = 0; 2351 int viewFlagMasks = 0; 2352 2353 boolean setScrollContainer = false; 2354 2355 int x = 0; 2356 int y = 0; 2357 2358 float tx = 0; 2359 float ty = 0; 2360 float rotation = 0; 2361 float rotationX = 0; 2362 float rotationY = 0; 2363 float sx = 1f; 2364 float sy = 1f; 2365 boolean transformSet = false; 2366 2367 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2368 2369 int overScrollMode = mOverScrollMode; 2370 final int N = a.getIndexCount(); 2371 for (int i = 0; i < N; i++) { 2372 int attr = a.getIndex(i); 2373 switch (attr) { 2374 case com.android.internal.R.styleable.View_background: 2375 background = a.getDrawable(attr); 2376 break; 2377 case com.android.internal.R.styleable.View_padding: 2378 padding = a.getDimensionPixelSize(attr, -1); 2379 break; 2380 case com.android.internal.R.styleable.View_paddingLeft: 2381 leftPadding = a.getDimensionPixelSize(attr, -1); 2382 break; 2383 case com.android.internal.R.styleable.View_paddingTop: 2384 topPadding = a.getDimensionPixelSize(attr, -1); 2385 break; 2386 case com.android.internal.R.styleable.View_paddingRight: 2387 rightPadding = a.getDimensionPixelSize(attr, -1); 2388 break; 2389 case com.android.internal.R.styleable.View_paddingBottom: 2390 bottomPadding = a.getDimensionPixelSize(attr, -1); 2391 break; 2392 case com.android.internal.R.styleable.View_scrollX: 2393 x = a.getDimensionPixelOffset(attr, 0); 2394 break; 2395 case com.android.internal.R.styleable.View_scrollY: 2396 y = a.getDimensionPixelOffset(attr, 0); 2397 break; 2398 case com.android.internal.R.styleable.View_alpha: 2399 setAlpha(a.getFloat(attr, 1f)); 2400 break; 2401 case com.android.internal.R.styleable.View_transformPivotX: 2402 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2403 break; 2404 case com.android.internal.R.styleable.View_transformPivotY: 2405 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2406 break; 2407 case com.android.internal.R.styleable.View_translationX: 2408 tx = a.getDimensionPixelOffset(attr, 0); 2409 transformSet = true; 2410 break; 2411 case com.android.internal.R.styleable.View_translationY: 2412 ty = a.getDimensionPixelOffset(attr, 0); 2413 transformSet = true; 2414 break; 2415 case com.android.internal.R.styleable.View_rotation: 2416 rotation = a.getFloat(attr, 0); 2417 transformSet = true; 2418 break; 2419 case com.android.internal.R.styleable.View_rotationX: 2420 rotationX = a.getFloat(attr, 0); 2421 transformSet = true; 2422 break; 2423 case com.android.internal.R.styleable.View_rotationY: 2424 rotationY = a.getFloat(attr, 0); 2425 transformSet = true; 2426 break; 2427 case com.android.internal.R.styleable.View_scaleX: 2428 sx = a.getFloat(attr, 1f); 2429 transformSet = true; 2430 break; 2431 case com.android.internal.R.styleable.View_scaleY: 2432 sy = a.getFloat(attr, 1f); 2433 transformSet = true; 2434 break; 2435 case com.android.internal.R.styleable.View_id: 2436 mID = a.getResourceId(attr, NO_ID); 2437 break; 2438 case com.android.internal.R.styleable.View_tag: 2439 mTag = a.getText(attr); 2440 break; 2441 case com.android.internal.R.styleable.View_fitsSystemWindows: 2442 if (a.getBoolean(attr, false)) { 2443 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2444 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2445 } 2446 break; 2447 case com.android.internal.R.styleable.View_focusable: 2448 if (a.getBoolean(attr, false)) { 2449 viewFlagValues |= FOCUSABLE; 2450 viewFlagMasks |= FOCUSABLE_MASK; 2451 } 2452 break; 2453 case com.android.internal.R.styleable.View_focusableInTouchMode: 2454 if (a.getBoolean(attr, false)) { 2455 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2456 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2457 } 2458 break; 2459 case com.android.internal.R.styleable.View_clickable: 2460 if (a.getBoolean(attr, false)) { 2461 viewFlagValues |= CLICKABLE; 2462 viewFlagMasks |= CLICKABLE; 2463 } 2464 break; 2465 case com.android.internal.R.styleable.View_longClickable: 2466 if (a.getBoolean(attr, false)) { 2467 viewFlagValues |= LONG_CLICKABLE; 2468 viewFlagMasks |= LONG_CLICKABLE; 2469 } 2470 break; 2471 case com.android.internal.R.styleable.View_saveEnabled: 2472 if (!a.getBoolean(attr, true)) { 2473 viewFlagValues |= SAVE_DISABLED; 2474 viewFlagMasks |= SAVE_DISABLED_MASK; 2475 } 2476 break; 2477 case com.android.internal.R.styleable.View_duplicateParentState: 2478 if (a.getBoolean(attr, false)) { 2479 viewFlagValues |= DUPLICATE_PARENT_STATE; 2480 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2481 } 2482 break; 2483 case com.android.internal.R.styleable.View_visibility: 2484 final int visibility = a.getInt(attr, 0); 2485 if (visibility != 0) { 2486 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2487 viewFlagMasks |= VISIBILITY_MASK; 2488 } 2489 break; 2490 case com.android.internal.R.styleable.View_drawingCacheQuality: 2491 final int cacheQuality = a.getInt(attr, 0); 2492 if (cacheQuality != 0) { 2493 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2494 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2495 } 2496 break; 2497 case com.android.internal.R.styleable.View_contentDescription: 2498 mContentDescription = a.getString(attr); 2499 break; 2500 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2501 if (!a.getBoolean(attr, true)) { 2502 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2503 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2504 } 2505 break; 2506 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2507 if (!a.getBoolean(attr, true)) { 2508 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2509 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2510 } 2511 break; 2512 case R.styleable.View_scrollbars: 2513 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2514 if (scrollbars != SCROLLBARS_NONE) { 2515 viewFlagValues |= scrollbars; 2516 viewFlagMasks |= SCROLLBARS_MASK; 2517 initializeScrollbars(a); 2518 } 2519 break; 2520 case R.styleable.View_fadingEdge: 2521 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2522 if (fadingEdge != FADING_EDGE_NONE) { 2523 viewFlagValues |= fadingEdge; 2524 viewFlagMasks |= FADING_EDGE_MASK; 2525 initializeFadingEdge(a); 2526 } 2527 break; 2528 case R.styleable.View_scrollbarStyle: 2529 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2530 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2531 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2532 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2533 } 2534 break; 2535 case R.styleable.View_isScrollContainer: 2536 setScrollContainer = true; 2537 if (a.getBoolean(attr, false)) { 2538 setScrollContainer(true); 2539 } 2540 break; 2541 case com.android.internal.R.styleable.View_keepScreenOn: 2542 if (a.getBoolean(attr, false)) { 2543 viewFlagValues |= KEEP_SCREEN_ON; 2544 viewFlagMasks |= KEEP_SCREEN_ON; 2545 } 2546 break; 2547 case R.styleable.View_filterTouchesWhenObscured: 2548 if (a.getBoolean(attr, false)) { 2549 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2550 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2551 } 2552 break; 2553 case R.styleable.View_nextFocusLeft: 2554 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2555 break; 2556 case R.styleable.View_nextFocusRight: 2557 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2558 break; 2559 case R.styleable.View_nextFocusUp: 2560 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2561 break; 2562 case R.styleable.View_nextFocusDown: 2563 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2564 break; 2565 case R.styleable.View_nextFocusForward: 2566 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2567 break; 2568 case R.styleable.View_minWidth: 2569 mMinWidth = a.getDimensionPixelSize(attr, 0); 2570 break; 2571 case R.styleable.View_minHeight: 2572 mMinHeight = a.getDimensionPixelSize(attr, 0); 2573 break; 2574 case R.styleable.View_onClick: 2575 if (context.isRestricted()) { 2576 throw new IllegalStateException("The android:onClick attribute cannot " 2577 + "be used within a restricted context"); 2578 } 2579 2580 final String handlerName = a.getString(attr); 2581 if (handlerName != null) { 2582 setOnClickListener(new OnClickListener() { 2583 private Method mHandler; 2584 2585 public void onClick(View v) { 2586 if (mHandler == null) { 2587 try { 2588 mHandler = getContext().getClass().getMethod(handlerName, 2589 View.class); 2590 } catch (NoSuchMethodException e) { 2591 int id = getId(); 2592 String idText = id == NO_ID ? "" : " with id '" 2593 + getContext().getResources().getResourceEntryName( 2594 id) + "'"; 2595 throw new IllegalStateException("Could not find a method " + 2596 handlerName + "(View) in the activity " 2597 + getContext().getClass() + " for onClick handler" 2598 + " on view " + View.this.getClass() + idText, e); 2599 } 2600 } 2601 2602 try { 2603 mHandler.invoke(getContext(), View.this); 2604 } catch (IllegalAccessException e) { 2605 throw new IllegalStateException("Could not execute non " 2606 + "public method of the activity", e); 2607 } catch (InvocationTargetException e) { 2608 throw new IllegalStateException("Could not execute " 2609 + "method of the activity", e); 2610 } 2611 } 2612 }); 2613 } 2614 break; 2615 case R.styleable.View_overScrollMode: 2616 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2617 break; 2618 case R.styleable.View_verticalScrollbarPosition: 2619 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2620 break; 2621 case R.styleable.View_layerType: 2622 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2623 break; 2624 } 2625 } 2626 2627 setOverScrollMode(overScrollMode); 2628 2629 if (background != null) { 2630 setBackgroundDrawable(background); 2631 } 2632 2633 if (padding >= 0) { 2634 leftPadding = padding; 2635 topPadding = padding; 2636 rightPadding = padding; 2637 bottomPadding = padding; 2638 } 2639 2640 // If the user specified the padding (either with android:padding or 2641 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2642 // use the default padding or the padding from the background drawable 2643 // (stored at this point in mPadding*) 2644 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2645 topPadding >= 0 ? topPadding : mPaddingTop, 2646 rightPadding >= 0 ? rightPadding : mPaddingRight, 2647 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2648 2649 if (viewFlagMasks != 0) { 2650 setFlags(viewFlagValues, viewFlagMasks); 2651 } 2652 2653 // Needs to be called after mViewFlags is set 2654 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2655 recomputePadding(); 2656 } 2657 2658 if (x != 0 || y != 0) { 2659 scrollTo(x, y); 2660 } 2661 2662 if (transformSet) { 2663 setTranslationX(tx); 2664 setTranslationY(ty); 2665 setRotation(rotation); 2666 setRotationX(rotationX); 2667 setRotationY(rotationY); 2668 setScaleX(sx); 2669 setScaleY(sy); 2670 } 2671 2672 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2673 setScrollContainer(true); 2674 } 2675 2676 computeOpaqueFlags(); 2677 2678 a.recycle(); 2679 } 2680 2681 /** 2682 * Non-public constructor for use in testing 2683 */ 2684 View() { 2685 } 2686 2687 /** 2688 * <p> 2689 * Initializes the fading edges from a given set of styled attributes. This 2690 * method should be called by subclasses that need fading edges and when an 2691 * instance of these subclasses is created programmatically rather than 2692 * being inflated from XML. This method is automatically called when the XML 2693 * is inflated. 2694 * </p> 2695 * 2696 * @param a the styled attributes set to initialize the fading edges from 2697 */ 2698 protected void initializeFadingEdge(TypedArray a) { 2699 initScrollCache(); 2700 2701 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2702 R.styleable.View_fadingEdgeLength, 2703 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2704 } 2705 2706 /** 2707 * Returns the size of the vertical faded edges used to indicate that more 2708 * content in this view is visible. 2709 * 2710 * @return The size in pixels of the vertical faded edge or 0 if vertical 2711 * faded edges are not enabled for this view. 2712 * @attr ref android.R.styleable#View_fadingEdgeLength 2713 */ 2714 public int getVerticalFadingEdgeLength() { 2715 if (isVerticalFadingEdgeEnabled()) { 2716 ScrollabilityCache cache = mScrollCache; 2717 if (cache != null) { 2718 return cache.fadingEdgeLength; 2719 } 2720 } 2721 return 0; 2722 } 2723 2724 /** 2725 * Set the size of the faded edge used to indicate that more content in this 2726 * view is available. Will not change whether the fading edge is enabled; use 2727 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2728 * to enable the fading edge for the vertical or horizontal fading edges. 2729 * 2730 * @param length The size in pixels of the faded edge used to indicate that more 2731 * content in this view is visible. 2732 */ 2733 public void setFadingEdgeLength(int length) { 2734 initScrollCache(); 2735 mScrollCache.fadingEdgeLength = length; 2736 } 2737 2738 /** 2739 * Returns the size of the horizontal faded edges used to indicate that more 2740 * content in this view is visible. 2741 * 2742 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2743 * faded edges are not enabled for this view. 2744 * @attr ref android.R.styleable#View_fadingEdgeLength 2745 */ 2746 public int getHorizontalFadingEdgeLength() { 2747 if (isHorizontalFadingEdgeEnabled()) { 2748 ScrollabilityCache cache = mScrollCache; 2749 if (cache != null) { 2750 return cache.fadingEdgeLength; 2751 } 2752 } 2753 return 0; 2754 } 2755 2756 /** 2757 * Returns the width of the vertical scrollbar. 2758 * 2759 * @return The width in pixels of the vertical scrollbar or 0 if there 2760 * is no vertical scrollbar. 2761 */ 2762 public int getVerticalScrollbarWidth() { 2763 ScrollabilityCache cache = mScrollCache; 2764 if (cache != null) { 2765 ScrollBarDrawable scrollBar = cache.scrollBar; 2766 if (scrollBar != null) { 2767 int size = scrollBar.getSize(true); 2768 if (size <= 0) { 2769 size = cache.scrollBarSize; 2770 } 2771 return size; 2772 } 2773 return 0; 2774 } 2775 return 0; 2776 } 2777 2778 /** 2779 * Returns the height of the horizontal scrollbar. 2780 * 2781 * @return The height in pixels of the horizontal scrollbar or 0 if 2782 * there is no horizontal scrollbar. 2783 */ 2784 protected int getHorizontalScrollbarHeight() { 2785 ScrollabilityCache cache = mScrollCache; 2786 if (cache != null) { 2787 ScrollBarDrawable scrollBar = cache.scrollBar; 2788 if (scrollBar != null) { 2789 int size = scrollBar.getSize(false); 2790 if (size <= 0) { 2791 size = cache.scrollBarSize; 2792 } 2793 return size; 2794 } 2795 return 0; 2796 } 2797 return 0; 2798 } 2799 2800 /** 2801 * <p> 2802 * Initializes the scrollbars from a given set of styled attributes. This 2803 * method should be called by subclasses that need scrollbars and when an 2804 * instance of these subclasses is created programmatically rather than 2805 * being inflated from XML. This method is automatically called when the XML 2806 * is inflated. 2807 * </p> 2808 * 2809 * @param a the styled attributes set to initialize the scrollbars from 2810 */ 2811 protected void initializeScrollbars(TypedArray a) { 2812 initScrollCache(); 2813 2814 final ScrollabilityCache scrollabilityCache = mScrollCache; 2815 2816 if (scrollabilityCache.scrollBar == null) { 2817 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2818 } 2819 2820 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2821 2822 if (!fadeScrollbars) { 2823 scrollabilityCache.state = ScrollabilityCache.ON; 2824 } 2825 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2826 2827 2828 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2829 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2830 .getScrollBarFadeDuration()); 2831 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2832 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2833 ViewConfiguration.getScrollDefaultDelay()); 2834 2835 2836 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2837 com.android.internal.R.styleable.View_scrollbarSize, 2838 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2839 2840 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2841 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2842 2843 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2844 if (thumb != null) { 2845 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2846 } 2847 2848 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2849 false); 2850 if (alwaysDraw) { 2851 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2852 } 2853 2854 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2855 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2856 2857 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2858 if (thumb != null) { 2859 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2860 } 2861 2862 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2863 false); 2864 if (alwaysDraw) { 2865 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2866 } 2867 2868 // Re-apply user/background padding so that scrollbar(s) get added 2869 recomputePadding(); 2870 } 2871 2872 /** 2873 * <p> 2874 * Initalizes the scrollability cache if necessary. 2875 * </p> 2876 */ 2877 private void initScrollCache() { 2878 if (mScrollCache == null) { 2879 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2880 } 2881 } 2882 2883 /** 2884 * Set the position of the vertical scroll bar. Should be one of 2885 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 2886 * {@link #SCROLLBAR_POSITION_RIGHT}. 2887 * 2888 * @param position Where the vertical scroll bar should be positioned. 2889 */ 2890 public void setVerticalScrollbarPosition(int position) { 2891 if (mVerticalScrollbarPosition != position) { 2892 mVerticalScrollbarPosition = position; 2893 computeOpaqueFlags(); 2894 recomputePadding(); 2895 } 2896 } 2897 2898 /** 2899 * @return The position where the vertical scroll bar will show, if applicable. 2900 * @see #setVerticalScrollbarPosition(int) 2901 */ 2902 public int getVerticalScrollbarPosition() { 2903 return mVerticalScrollbarPosition; 2904 } 2905 2906 /** 2907 * Register a callback to be invoked when focus of this view changed. 2908 * 2909 * @param l The callback that will run. 2910 */ 2911 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2912 mOnFocusChangeListener = l; 2913 } 2914 2915 /** 2916 * Add a listener that will be called when the bounds of the view change due to 2917 * layout processing. 2918 * 2919 * @param listener The listener that will be called when layout bounds change. 2920 */ 2921 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 2922 if (mOnLayoutChangeListeners == null) { 2923 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 2924 } 2925 mOnLayoutChangeListeners.add(listener); 2926 } 2927 2928 /** 2929 * Remove a listener for layout changes. 2930 * 2931 * @param listener The listener for layout bounds change. 2932 */ 2933 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 2934 if (mOnLayoutChangeListeners == null) { 2935 return; 2936 } 2937 mOnLayoutChangeListeners.remove(listener); 2938 } 2939 2940 /** 2941 * Gets the current list of listeners for layout changes. 2942 */ 2943 public List<OnLayoutChangeListener> getOnLayoutChangeListeners() { 2944 return mOnLayoutChangeListeners; 2945 } 2946 2947 /** 2948 * Returns the focus-change callback registered for this view. 2949 * 2950 * @return The callback, or null if one is not registered. 2951 */ 2952 public OnFocusChangeListener getOnFocusChangeListener() { 2953 return mOnFocusChangeListener; 2954 } 2955 2956 /** 2957 * Register a callback to be invoked when this view is clicked. If this view is not 2958 * clickable, it becomes clickable. 2959 * 2960 * @param l The callback that will run 2961 * 2962 * @see #setClickable(boolean) 2963 */ 2964 public void setOnClickListener(OnClickListener l) { 2965 if (!isClickable()) { 2966 setClickable(true); 2967 } 2968 mOnClickListener = l; 2969 } 2970 2971 /** 2972 * Register a callback to be invoked when this view is clicked and held. If this view is not 2973 * long clickable, it becomes long clickable. 2974 * 2975 * @param l The callback that will run 2976 * 2977 * @see #setLongClickable(boolean) 2978 */ 2979 public void setOnLongClickListener(OnLongClickListener l) { 2980 if (!isLongClickable()) { 2981 setLongClickable(true); 2982 } 2983 mOnLongClickListener = l; 2984 } 2985 2986 /** 2987 * Register a callback to be invoked when the context menu for this view is 2988 * being built. If this view is not long clickable, it becomes long clickable. 2989 * 2990 * @param l The callback that will run 2991 * 2992 */ 2993 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 2994 if (!isLongClickable()) { 2995 setLongClickable(true); 2996 } 2997 mOnCreateContextMenuListener = l; 2998 } 2999 3000 /** 3001 * Call this view's OnClickListener, if it is defined. 3002 * 3003 * @return True there was an assigned OnClickListener that was called, false 3004 * otherwise is returned. 3005 */ 3006 public boolean performClick() { 3007 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3008 3009 if (mOnClickListener != null) { 3010 playSoundEffect(SoundEffectConstants.CLICK); 3011 mOnClickListener.onClick(this); 3012 return true; 3013 } 3014 3015 return false; 3016 } 3017 3018 /** 3019 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3020 * OnLongClickListener did not consume the event. 3021 * 3022 * @return True if one of the above receivers consumed the event, false otherwise. 3023 */ 3024 public boolean performLongClick() { 3025 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3026 3027 boolean handled = false; 3028 if (mOnLongClickListener != null) { 3029 handled = mOnLongClickListener.onLongClick(View.this); 3030 } 3031 if (!handled) { 3032 handled = showContextMenu(); 3033 } 3034 if (handled) { 3035 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3036 } 3037 return handled; 3038 } 3039 3040 /** 3041 * Bring up the context menu for this view. 3042 * 3043 * @return Whether a context menu was displayed. 3044 */ 3045 public boolean showContextMenu() { 3046 return getParent().showContextMenuForChild(this); 3047 } 3048 3049 /** 3050 * Start an action mode. 3051 * 3052 * @param callback Callback that will control the lifecycle of the action mode 3053 * @return The new action mode if it is started, null otherwise 3054 * 3055 * @see ActionMode 3056 */ 3057 public ActionMode startActionMode(ActionMode.Callback callback) { 3058 return getParent().startActionModeForChild(this, callback); 3059 } 3060 3061 /** 3062 * Register a callback to be invoked when a key is pressed in this view. 3063 * @param l the key listener to attach to this view 3064 */ 3065 public void setOnKeyListener(OnKeyListener l) { 3066 mOnKeyListener = l; 3067 } 3068 3069 /** 3070 * Register a callback to be invoked when a touch event is sent to this view. 3071 * @param l the touch listener to attach to this view 3072 */ 3073 public void setOnTouchListener(OnTouchListener l) { 3074 mOnTouchListener = l; 3075 } 3076 3077 /** 3078 * Register a callback to be invoked when a drag event is sent to this view. 3079 * @param l The drag listener to attach to this view 3080 */ 3081 public void setOnDragListener(OnDragListener l) { 3082 mOnDragListener = l; 3083 } 3084 3085 /** 3086 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 3087 * 3088 * Note: this does not check whether this {@link View} should get focus, it just 3089 * gives it focus no matter what. It should only be called internally by framework 3090 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3091 * 3092 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 3093 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 3094 * focus moved when requestFocus() is called. It may not always 3095 * apply, in which case use the default View.FOCUS_DOWN. 3096 * @param previouslyFocusedRect The rectangle of the view that had focus 3097 * prior in this View's coordinate system. 3098 */ 3099 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3100 if (DBG) { 3101 System.out.println(this + " requestFocus()"); 3102 } 3103 3104 if ((mPrivateFlags & FOCUSED) == 0) { 3105 mPrivateFlags |= FOCUSED; 3106 3107 if (mParent != null) { 3108 mParent.requestChildFocus(this, this); 3109 } 3110 3111 onFocusChanged(true, direction, previouslyFocusedRect); 3112 refreshDrawableState(); 3113 } 3114 } 3115 3116 /** 3117 * Request that a rectangle of this view be visible on the screen, 3118 * scrolling if necessary just enough. 3119 * 3120 * <p>A View should call this if it maintains some notion of which part 3121 * of its content is interesting. For example, a text editing view 3122 * should call this when its cursor moves. 3123 * 3124 * @param rectangle The rectangle. 3125 * @return Whether any parent scrolled. 3126 */ 3127 public boolean requestRectangleOnScreen(Rect rectangle) { 3128 return requestRectangleOnScreen(rectangle, false); 3129 } 3130 3131 /** 3132 * Request that a rectangle of this view be visible on the screen, 3133 * scrolling if necessary just enough. 3134 * 3135 * <p>A View should call this if it maintains some notion of which part 3136 * of its content is interesting. For example, a text editing view 3137 * should call this when its cursor moves. 3138 * 3139 * <p>When <code>immediate</code> is set to true, scrolling will not be 3140 * animated. 3141 * 3142 * @param rectangle The rectangle. 3143 * @param immediate True to forbid animated scrolling, false otherwise 3144 * @return Whether any parent scrolled. 3145 */ 3146 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3147 View child = this; 3148 ViewParent parent = mParent; 3149 boolean scrolled = false; 3150 while (parent != null) { 3151 scrolled |= parent.requestChildRectangleOnScreen(child, 3152 rectangle, immediate); 3153 3154 // offset rect so next call has the rectangle in the 3155 // coordinate system of its direct child. 3156 rectangle.offset(child.getLeft(), child.getTop()); 3157 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3158 3159 if (!(parent instanceof View)) { 3160 break; 3161 } 3162 3163 child = (View) parent; 3164 parent = child.getParent(); 3165 } 3166 return scrolled; 3167 } 3168 3169 /** 3170 * Called when this view wants to give up focus. This will cause 3171 * {@link #onFocusChanged} to be called. 3172 */ 3173 public void clearFocus() { 3174 if (DBG) { 3175 System.out.println(this + " clearFocus()"); 3176 } 3177 3178 if ((mPrivateFlags & FOCUSED) != 0) { 3179 mPrivateFlags &= ~FOCUSED; 3180 3181 if (mParent != null) { 3182 mParent.clearChildFocus(this); 3183 } 3184 3185 onFocusChanged(false, 0, null); 3186 refreshDrawableState(); 3187 } 3188 } 3189 3190 /** 3191 * Called to clear the focus of a view that is about to be removed. 3192 * Doesn't call clearChildFocus, which prevents this view from taking 3193 * focus again before it has been removed from the parent 3194 */ 3195 void clearFocusForRemoval() { 3196 if ((mPrivateFlags & FOCUSED) != 0) { 3197 mPrivateFlags &= ~FOCUSED; 3198 3199 onFocusChanged(false, 0, null); 3200 refreshDrawableState(); 3201 } 3202 } 3203 3204 /** 3205 * Called internally by the view system when a new view is getting focus. 3206 * This is what clears the old focus. 3207 */ 3208 void unFocus() { 3209 if (DBG) { 3210 System.out.println(this + " unFocus()"); 3211 } 3212 3213 if ((mPrivateFlags & FOCUSED) != 0) { 3214 mPrivateFlags &= ~FOCUSED; 3215 3216 onFocusChanged(false, 0, null); 3217 refreshDrawableState(); 3218 } 3219 } 3220 3221 /** 3222 * Returns true if this view has focus iteself, or is the ancestor of the 3223 * view that has focus. 3224 * 3225 * @return True if this view has or contains focus, false otherwise. 3226 */ 3227 @ViewDebug.ExportedProperty(category = "focus") 3228 public boolean hasFocus() { 3229 return (mPrivateFlags & FOCUSED) != 0; 3230 } 3231 3232 /** 3233 * Returns true if this view is focusable or if it contains a reachable View 3234 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3235 * is a View whose parents do not block descendants focus. 3236 * 3237 * Only {@link #VISIBLE} views are considered focusable. 3238 * 3239 * @return True if the view is focusable or if the view contains a focusable 3240 * View, false otherwise. 3241 * 3242 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3243 */ 3244 public boolean hasFocusable() { 3245 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3246 } 3247 3248 /** 3249 * Called by the view system when the focus state of this view changes. 3250 * When the focus change event is caused by directional navigation, direction 3251 * and previouslyFocusedRect provide insight into where the focus is coming from. 3252 * When overriding, be sure to call up through to the super class so that 3253 * the standard focus handling will occur. 3254 * 3255 * @param gainFocus True if the View has focus; false otherwise. 3256 * @param direction The direction focus has moved when requestFocus() 3257 * is called to give this view focus. Values are 3258 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3259 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3260 * It may not always apply, in which case use the default. 3261 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3262 * system, of the previously focused view. If applicable, this will be 3263 * passed in as finer grained information about where the focus is coming 3264 * from (in addition to direction). Will be <code>null</code> otherwise. 3265 */ 3266 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3267 if (gainFocus) { 3268 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3269 } 3270 3271 InputMethodManager imm = InputMethodManager.peekInstance(); 3272 if (!gainFocus) { 3273 if (isPressed()) { 3274 setPressed(false); 3275 } 3276 if (imm != null && mAttachInfo != null 3277 && mAttachInfo.mHasWindowFocus) { 3278 imm.focusOut(this); 3279 } 3280 onFocusLost(); 3281 } else if (imm != null && mAttachInfo != null 3282 && mAttachInfo.mHasWindowFocus) { 3283 imm.focusIn(this); 3284 } 3285 3286 invalidate(); 3287 if (mOnFocusChangeListener != null) { 3288 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3289 } 3290 3291 if (mAttachInfo != null) { 3292 mAttachInfo.mKeyDispatchState.reset(this); 3293 } 3294 } 3295 3296 /** 3297 * {@inheritDoc} 3298 */ 3299 public void sendAccessibilityEvent(int eventType) { 3300 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3301 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3302 } 3303 } 3304 3305 /** 3306 * {@inheritDoc} 3307 */ 3308 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3309 if (!isShown()) { 3310 return; 3311 } 3312 event.setClassName(getClass().getName()); 3313 event.setPackageName(getContext().getPackageName()); 3314 event.setEnabled(isEnabled()); 3315 event.setContentDescription(mContentDescription); 3316 3317 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3318 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3319 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3320 event.setItemCount(focusablesTempList.size()); 3321 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3322 focusablesTempList.clear(); 3323 } 3324 3325 dispatchPopulateAccessibilityEvent(event); 3326 3327 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 3328 } 3329 3330 /** 3331 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 3332 * to be populated. 3333 * 3334 * @param event The event. 3335 * 3336 * @return True if the event population was completed. 3337 */ 3338 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3339 return false; 3340 } 3341 3342 /** 3343 * Gets the {@link View} description. It briefly describes the view and is 3344 * primarily used for accessibility support. Set this property to enable 3345 * better accessibility support for your application. This is especially 3346 * true for views that do not have textual representation (For example, 3347 * ImageButton). 3348 * 3349 * @return The content descriptiopn. 3350 * 3351 * @attr ref android.R.styleable#View_contentDescription 3352 */ 3353 public CharSequence getContentDescription() { 3354 return mContentDescription; 3355 } 3356 3357 /** 3358 * Sets the {@link View} description. It briefly describes the view and is 3359 * primarily used for accessibility support. Set this property to enable 3360 * better accessibility support for your application. This is especially 3361 * true for views that do not have textual representation (For example, 3362 * ImageButton). 3363 * 3364 * @param contentDescription The content description. 3365 * 3366 * @attr ref android.R.styleable#View_contentDescription 3367 */ 3368 public void setContentDescription(CharSequence contentDescription) { 3369 mContentDescription = contentDescription; 3370 } 3371 3372 /** 3373 * Invoked whenever this view loses focus, either by losing window focus or by losing 3374 * focus within its window. This method can be used to clear any state tied to the 3375 * focus. For instance, if a button is held pressed with the trackball and the window 3376 * loses focus, this method can be used to cancel the press. 3377 * 3378 * Subclasses of View overriding this method should always call super.onFocusLost(). 3379 * 3380 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3381 * @see #onWindowFocusChanged(boolean) 3382 * 3383 * @hide pending API council approval 3384 */ 3385 protected void onFocusLost() { 3386 resetPressedState(); 3387 } 3388 3389 private void resetPressedState() { 3390 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3391 return; 3392 } 3393 3394 if (isPressed()) { 3395 setPressed(false); 3396 3397 if (!mHasPerformedLongPress) { 3398 removeLongPressCallback(); 3399 } 3400 } 3401 } 3402 3403 /** 3404 * Returns true if this view has focus 3405 * 3406 * @return True if this view has focus, false otherwise. 3407 */ 3408 @ViewDebug.ExportedProperty(category = "focus") 3409 public boolean isFocused() { 3410 return (mPrivateFlags & FOCUSED) != 0; 3411 } 3412 3413 /** 3414 * Find the view in the hierarchy rooted at this view that currently has 3415 * focus. 3416 * 3417 * @return The view that currently has focus, or null if no focused view can 3418 * be found. 3419 */ 3420 public View findFocus() { 3421 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3422 } 3423 3424 /** 3425 * Change whether this view is one of the set of scrollable containers in 3426 * its window. This will be used to determine whether the window can 3427 * resize or must pan when a soft input area is open -- scrollable 3428 * containers allow the window to use resize mode since the container 3429 * will appropriately shrink. 3430 */ 3431 public void setScrollContainer(boolean isScrollContainer) { 3432 if (isScrollContainer) { 3433 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3434 mAttachInfo.mScrollContainers.add(this); 3435 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3436 } 3437 mPrivateFlags |= SCROLL_CONTAINER; 3438 } else { 3439 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3440 mAttachInfo.mScrollContainers.remove(this); 3441 } 3442 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3443 } 3444 } 3445 3446 /** 3447 * Returns the quality of the drawing cache. 3448 * 3449 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3450 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3451 * 3452 * @see #setDrawingCacheQuality(int) 3453 * @see #setDrawingCacheEnabled(boolean) 3454 * @see #isDrawingCacheEnabled() 3455 * 3456 * @attr ref android.R.styleable#View_drawingCacheQuality 3457 */ 3458 public int getDrawingCacheQuality() { 3459 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3460 } 3461 3462 /** 3463 * Set the drawing cache quality of this view. This value is used only when the 3464 * drawing cache is enabled 3465 * 3466 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3467 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3468 * 3469 * @see #getDrawingCacheQuality() 3470 * @see #setDrawingCacheEnabled(boolean) 3471 * @see #isDrawingCacheEnabled() 3472 * 3473 * @attr ref android.R.styleable#View_drawingCacheQuality 3474 */ 3475 public void setDrawingCacheQuality(int quality) { 3476 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3477 } 3478 3479 /** 3480 * Returns whether the screen should remain on, corresponding to the current 3481 * value of {@link #KEEP_SCREEN_ON}. 3482 * 3483 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3484 * 3485 * @see #setKeepScreenOn(boolean) 3486 * 3487 * @attr ref android.R.styleable#View_keepScreenOn 3488 */ 3489 public boolean getKeepScreenOn() { 3490 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3491 } 3492 3493 /** 3494 * Controls whether the screen should remain on, modifying the 3495 * value of {@link #KEEP_SCREEN_ON}. 3496 * 3497 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3498 * 3499 * @see #getKeepScreenOn() 3500 * 3501 * @attr ref android.R.styleable#View_keepScreenOn 3502 */ 3503 public void setKeepScreenOn(boolean keepScreenOn) { 3504 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3505 } 3506 3507 /** 3508 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3509 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3510 * 3511 * @attr ref android.R.styleable#View_nextFocusLeft 3512 */ 3513 public int getNextFocusLeftId() { 3514 return mNextFocusLeftId; 3515 } 3516 3517 /** 3518 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3519 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3520 * decide automatically. 3521 * 3522 * @attr ref android.R.styleable#View_nextFocusLeft 3523 */ 3524 public void setNextFocusLeftId(int nextFocusLeftId) { 3525 mNextFocusLeftId = nextFocusLeftId; 3526 } 3527 3528 /** 3529 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3530 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3531 * 3532 * @attr ref android.R.styleable#View_nextFocusRight 3533 */ 3534 public int getNextFocusRightId() { 3535 return mNextFocusRightId; 3536 } 3537 3538 /** 3539 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3540 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3541 * decide automatically. 3542 * 3543 * @attr ref android.R.styleable#View_nextFocusRight 3544 */ 3545 public void setNextFocusRightId(int nextFocusRightId) { 3546 mNextFocusRightId = nextFocusRightId; 3547 } 3548 3549 /** 3550 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3551 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3552 * 3553 * @attr ref android.R.styleable#View_nextFocusUp 3554 */ 3555 public int getNextFocusUpId() { 3556 return mNextFocusUpId; 3557 } 3558 3559 /** 3560 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3561 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 3562 * decide automatically. 3563 * 3564 * @attr ref android.R.styleable#View_nextFocusUp 3565 */ 3566 public void setNextFocusUpId(int nextFocusUpId) { 3567 mNextFocusUpId = nextFocusUpId; 3568 } 3569 3570 /** 3571 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3572 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3573 * 3574 * @attr ref android.R.styleable#View_nextFocusDown 3575 */ 3576 public int getNextFocusDownId() { 3577 return mNextFocusDownId; 3578 } 3579 3580 /** 3581 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3582 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 3583 * decide automatically. 3584 * 3585 * @attr ref android.R.styleable#View_nextFocusDown 3586 */ 3587 public void setNextFocusDownId(int nextFocusDownId) { 3588 mNextFocusDownId = nextFocusDownId; 3589 } 3590 3591 /** 3592 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3593 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3594 * 3595 * @attr ref android.R.styleable#View_nextFocusForward 3596 */ 3597 public int getNextFocusForwardId() { 3598 return mNextFocusForwardId; 3599 } 3600 3601 /** 3602 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3603 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 3604 * decide automatically. 3605 * 3606 * @attr ref android.R.styleable#View_nextFocusForward 3607 */ 3608 public void setNextFocusForwardId(int nextFocusForwardId) { 3609 mNextFocusForwardId = nextFocusForwardId; 3610 } 3611 3612 /** 3613 * Returns the visibility of this view and all of its ancestors 3614 * 3615 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3616 */ 3617 public boolean isShown() { 3618 View current = this; 3619 //noinspection ConstantConditions 3620 do { 3621 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3622 return false; 3623 } 3624 ViewParent parent = current.mParent; 3625 if (parent == null) { 3626 return false; // We are not attached to the view root 3627 } 3628 if (!(parent instanceof View)) { 3629 return true; 3630 } 3631 current = (View) parent; 3632 } while (current != null); 3633 3634 return false; 3635 } 3636 3637 /** 3638 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3639 * is set 3640 * 3641 * @param insets Insets for system windows 3642 * 3643 * @return True if this view applied the insets, false otherwise 3644 */ 3645 protected boolean fitSystemWindows(Rect insets) { 3646 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3647 mPaddingLeft = insets.left; 3648 mPaddingTop = insets.top; 3649 mPaddingRight = insets.right; 3650 mPaddingBottom = insets.bottom; 3651 requestLayout(); 3652 return true; 3653 } 3654 return false; 3655 } 3656 3657 /** 3658 * Determine if this view has the FITS_SYSTEM_WINDOWS flag set. 3659 * @return True if window has FITS_SYSTEM_WINDOWS set 3660 * 3661 * @hide 3662 */ 3663 public boolean isFitsSystemWindowsFlagSet() { 3664 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 3665 } 3666 3667 /** 3668 * Returns the visibility status for this view. 3669 * 3670 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3671 * @attr ref android.R.styleable#View_visibility 3672 */ 3673 @ViewDebug.ExportedProperty(mapping = { 3674 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3675 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3676 @ViewDebug.IntToString(from = GONE, to = "GONE") 3677 }) 3678 public int getVisibility() { 3679 return mViewFlags & VISIBILITY_MASK; 3680 } 3681 3682 /** 3683 * Set the enabled state of this view. 3684 * 3685 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3686 * @attr ref android.R.styleable#View_visibility 3687 */ 3688 @RemotableViewMethod 3689 public void setVisibility(int visibility) { 3690 setFlags(visibility, VISIBILITY_MASK); 3691 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3692 } 3693 3694 /** 3695 * Returns the enabled status for this view. The interpretation of the 3696 * enabled state varies by subclass. 3697 * 3698 * @return True if this view is enabled, false otherwise. 3699 */ 3700 @ViewDebug.ExportedProperty 3701 public boolean isEnabled() { 3702 return (mViewFlags & ENABLED_MASK) == ENABLED; 3703 } 3704 3705 /** 3706 * Set the enabled state of this view. The interpretation of the enabled 3707 * state varies by subclass. 3708 * 3709 * @param enabled True if this view is enabled, false otherwise. 3710 */ 3711 @RemotableViewMethod 3712 public void setEnabled(boolean enabled) { 3713 if (enabled == isEnabled()) return; 3714 3715 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3716 3717 /* 3718 * The View most likely has to change its appearance, so refresh 3719 * the drawable state. 3720 */ 3721 refreshDrawableState(); 3722 3723 // Invalidate too, since the default behavior for views is to be 3724 // be drawn at 50% alpha rather than to change the drawable. 3725 invalidate(); 3726 } 3727 3728 /** 3729 * Set whether this view can receive the focus. 3730 * 3731 * Setting this to false will also ensure that this view is not focusable 3732 * in touch mode. 3733 * 3734 * @param focusable If true, this view can receive the focus. 3735 * 3736 * @see #setFocusableInTouchMode(boolean) 3737 * @attr ref android.R.styleable#View_focusable 3738 */ 3739 public void setFocusable(boolean focusable) { 3740 if (!focusable) { 3741 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3742 } 3743 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3744 } 3745 3746 /** 3747 * Set whether this view can receive focus while in touch mode. 3748 * 3749 * Setting this to true will also ensure that this view is focusable. 3750 * 3751 * @param focusableInTouchMode If true, this view can receive the focus while 3752 * in touch mode. 3753 * 3754 * @see #setFocusable(boolean) 3755 * @attr ref android.R.styleable#View_focusableInTouchMode 3756 */ 3757 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3758 // Focusable in touch mode should always be set before the focusable flag 3759 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3760 // which, in touch mode, will not successfully request focus on this view 3761 // because the focusable in touch mode flag is not set 3762 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3763 if (focusableInTouchMode) { 3764 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3765 } 3766 } 3767 3768 /** 3769 * Set whether this view should have sound effects enabled for events such as 3770 * clicking and touching. 3771 * 3772 * <p>You may wish to disable sound effects for a view if you already play sounds, 3773 * for instance, a dial key that plays dtmf tones. 3774 * 3775 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3776 * @see #isSoundEffectsEnabled() 3777 * @see #playSoundEffect(int) 3778 * @attr ref android.R.styleable#View_soundEffectsEnabled 3779 */ 3780 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3781 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3782 } 3783 3784 /** 3785 * @return whether this view should have sound effects enabled for events such as 3786 * clicking and touching. 3787 * 3788 * @see #setSoundEffectsEnabled(boolean) 3789 * @see #playSoundEffect(int) 3790 * @attr ref android.R.styleable#View_soundEffectsEnabled 3791 */ 3792 @ViewDebug.ExportedProperty 3793 public boolean isSoundEffectsEnabled() { 3794 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3795 } 3796 3797 /** 3798 * Set whether this view should have haptic feedback for events such as 3799 * long presses. 3800 * 3801 * <p>You may wish to disable haptic feedback if your view already controls 3802 * its own haptic feedback. 3803 * 3804 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3805 * @see #isHapticFeedbackEnabled() 3806 * @see #performHapticFeedback(int) 3807 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3808 */ 3809 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3810 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3811 } 3812 3813 /** 3814 * @return whether this view should have haptic feedback enabled for events 3815 * long presses. 3816 * 3817 * @see #setHapticFeedbackEnabled(boolean) 3818 * @see #performHapticFeedback(int) 3819 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3820 */ 3821 @ViewDebug.ExportedProperty 3822 public boolean isHapticFeedbackEnabled() { 3823 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3824 } 3825 3826 /** 3827 * If this view doesn't do any drawing on its own, set this flag to 3828 * allow further optimizations. By default, this flag is not set on 3829 * View, but could be set on some View subclasses such as ViewGroup. 3830 * 3831 * Typically, if you override {@link #onDraw} you should clear this flag. 3832 * 3833 * @param willNotDraw whether or not this View draw on its own 3834 */ 3835 public void setWillNotDraw(boolean willNotDraw) { 3836 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3837 } 3838 3839 /** 3840 * Returns whether or not this View draws on its own. 3841 * 3842 * @return true if this view has nothing to draw, false otherwise 3843 */ 3844 @ViewDebug.ExportedProperty(category = "drawing") 3845 public boolean willNotDraw() { 3846 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3847 } 3848 3849 /** 3850 * When a View's drawing cache is enabled, drawing is redirected to an 3851 * offscreen bitmap. Some views, like an ImageView, must be able to 3852 * bypass this mechanism if they already draw a single bitmap, to avoid 3853 * unnecessary usage of the memory. 3854 * 3855 * @param willNotCacheDrawing true if this view does not cache its 3856 * drawing, false otherwise 3857 */ 3858 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3859 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3860 } 3861 3862 /** 3863 * Returns whether or not this View can cache its drawing or not. 3864 * 3865 * @return true if this view does not cache its drawing, false otherwise 3866 */ 3867 @ViewDebug.ExportedProperty(category = "drawing") 3868 public boolean willNotCacheDrawing() { 3869 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3870 } 3871 3872 /** 3873 * Indicates whether this view reacts to click events or not. 3874 * 3875 * @return true if the view is clickable, false otherwise 3876 * 3877 * @see #setClickable(boolean) 3878 * @attr ref android.R.styleable#View_clickable 3879 */ 3880 @ViewDebug.ExportedProperty 3881 public boolean isClickable() { 3882 return (mViewFlags & CLICKABLE) == CLICKABLE; 3883 } 3884 3885 /** 3886 * Enables or disables click events for this view. When a view 3887 * is clickable it will change its state to "pressed" on every click. 3888 * Subclasses should set the view clickable to visually react to 3889 * user's clicks. 3890 * 3891 * @param clickable true to make the view clickable, false otherwise 3892 * 3893 * @see #isClickable() 3894 * @attr ref android.R.styleable#View_clickable 3895 */ 3896 public void setClickable(boolean clickable) { 3897 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3898 } 3899 3900 /** 3901 * Indicates whether this view reacts to long click events or not. 3902 * 3903 * @return true if the view is long clickable, false otherwise 3904 * 3905 * @see #setLongClickable(boolean) 3906 * @attr ref android.R.styleable#View_longClickable 3907 */ 3908 public boolean isLongClickable() { 3909 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 3910 } 3911 3912 /** 3913 * Enables or disables long click events for this view. When a view is long 3914 * clickable it reacts to the user holding down the button for a longer 3915 * duration than a tap. This event can either launch the listener or a 3916 * context menu. 3917 * 3918 * @param longClickable true to make the view long clickable, false otherwise 3919 * @see #isLongClickable() 3920 * @attr ref android.R.styleable#View_longClickable 3921 */ 3922 public void setLongClickable(boolean longClickable) { 3923 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 3924 } 3925 3926 /** 3927 * Sets the pressed state for this view. 3928 * 3929 * @see #isClickable() 3930 * @see #setClickable(boolean) 3931 * 3932 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 3933 * the View's internal state from a previously set "pressed" state. 3934 */ 3935 public void setPressed(boolean pressed) { 3936 if (pressed) { 3937 mPrivateFlags |= PRESSED; 3938 } else { 3939 mPrivateFlags &= ~PRESSED; 3940 } 3941 refreshDrawableState(); 3942 dispatchSetPressed(pressed); 3943 } 3944 3945 /** 3946 * Dispatch setPressed to all of this View's children. 3947 * 3948 * @see #setPressed(boolean) 3949 * 3950 * @param pressed The new pressed state 3951 */ 3952 protected void dispatchSetPressed(boolean pressed) { 3953 } 3954 3955 /** 3956 * Indicates whether the view is currently in pressed state. Unless 3957 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 3958 * the pressed state. 3959 * 3960 * @see #setPressed 3961 * @see #isClickable() 3962 * @see #setClickable(boolean) 3963 * 3964 * @return true if the view is currently pressed, false otherwise 3965 */ 3966 public boolean isPressed() { 3967 return (mPrivateFlags & PRESSED) == PRESSED; 3968 } 3969 3970 /** 3971 * Indicates whether this view will save its state (that is, 3972 * whether its {@link #onSaveInstanceState} method will be called). 3973 * 3974 * @return Returns true if the view state saving is enabled, else false. 3975 * 3976 * @see #setSaveEnabled(boolean) 3977 * @attr ref android.R.styleable#View_saveEnabled 3978 */ 3979 public boolean isSaveEnabled() { 3980 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 3981 } 3982 3983 /** 3984 * Controls whether the saving of this view's state is 3985 * enabled (that is, whether its {@link #onSaveInstanceState} method 3986 * will be called). Note that even if freezing is enabled, the 3987 * view still must have an id assigned to it (via {@link #setId setId()}) 3988 * for its state to be saved. This flag can only disable the 3989 * saving of this view; any child views may still have their state saved. 3990 * 3991 * @param enabled Set to false to <em>disable</em> state saving, or true 3992 * (the default) to allow it. 3993 * 3994 * @see #isSaveEnabled() 3995 * @see #setId(int) 3996 * @see #onSaveInstanceState() 3997 * @attr ref android.R.styleable#View_saveEnabled 3998 */ 3999 public void setSaveEnabled(boolean enabled) { 4000 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 4001 } 4002 4003 /** 4004 * Gets whether the framework should discard touches when the view's 4005 * window is obscured by another visible window. 4006 * Refer to the {@link View} security documentation for more details. 4007 * 4008 * @return True if touch filtering is enabled. 4009 * 4010 * @see #setFilterTouchesWhenObscured(boolean) 4011 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4012 */ 4013 @ViewDebug.ExportedProperty 4014 public boolean getFilterTouchesWhenObscured() { 4015 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4016 } 4017 4018 /** 4019 * Sets whether the framework should discard touches when the view's 4020 * window is obscured by another visible window. 4021 * Refer to the {@link View} security documentation for more details. 4022 * 4023 * @param enabled True if touch filtering should be enabled. 4024 * 4025 * @see #getFilterTouchesWhenObscured 4026 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4027 */ 4028 public void setFilterTouchesWhenObscured(boolean enabled) { 4029 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4030 FILTER_TOUCHES_WHEN_OBSCURED); 4031 } 4032 4033 /** 4034 * Indicates whether the entire hierarchy under this view will save its 4035 * state when a state saving traversal occurs from its parent. The default 4036 * is true; if false, these views will not be saved unless 4037 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4038 * 4039 * @return Returns true if the view state saving from parent is enabled, else false. 4040 * 4041 * @see #setSaveFromParentEnabled(boolean) 4042 */ 4043 public boolean isSaveFromParentEnabled() { 4044 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4045 } 4046 4047 /** 4048 * Controls whether the entire hierarchy under this view will save its 4049 * state when a state saving traversal occurs from its parent. The default 4050 * is true; if false, these views will not be saved unless 4051 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4052 * 4053 * @param enabled Set to false to <em>disable</em> state saving, or true 4054 * (the default) to allow it. 4055 * 4056 * @see #isSaveFromParentEnabled() 4057 * @see #setId(int) 4058 * @see #onSaveInstanceState() 4059 */ 4060 public void setSaveFromParentEnabled(boolean enabled) { 4061 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4062 } 4063 4064 4065 /** 4066 * Returns whether this View is able to take focus. 4067 * 4068 * @return True if this view can take focus, or false otherwise. 4069 * @attr ref android.R.styleable#View_focusable 4070 */ 4071 @ViewDebug.ExportedProperty(category = "focus") 4072 public final boolean isFocusable() { 4073 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4074 } 4075 4076 /** 4077 * When a view is focusable, it may not want to take focus when in touch mode. 4078 * For example, a button would like focus when the user is navigating via a D-pad 4079 * so that the user can click on it, but once the user starts touching the screen, 4080 * the button shouldn't take focus 4081 * @return Whether the view is focusable in touch mode. 4082 * @attr ref android.R.styleable#View_focusableInTouchMode 4083 */ 4084 @ViewDebug.ExportedProperty 4085 public final boolean isFocusableInTouchMode() { 4086 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4087 } 4088 4089 /** 4090 * Find the nearest view in the specified direction that can take focus. 4091 * This does not actually give focus to that view. 4092 * 4093 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4094 * 4095 * @return The nearest focusable in the specified direction, or null if none 4096 * can be found. 4097 */ 4098 public View focusSearch(int direction) { 4099 if (mParent != null) { 4100 return mParent.focusSearch(this, direction); 4101 } else { 4102 return null; 4103 } 4104 } 4105 4106 /** 4107 * This method is the last chance for the focused view and its ancestors to 4108 * respond to an arrow key. This is called when the focused view did not 4109 * consume the key internally, nor could the view system find a new view in 4110 * the requested direction to give focus to. 4111 * 4112 * @param focused The currently focused view. 4113 * @param direction The direction focus wants to move. One of FOCUS_UP, 4114 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4115 * @return True if the this view consumed this unhandled move. 4116 */ 4117 public boolean dispatchUnhandledMove(View focused, int direction) { 4118 return false; 4119 } 4120 4121 /** 4122 * If a user manually specified the next view id for a particular direction, 4123 * use the root to look up the view. 4124 * @param root The root view of the hierarchy containing this view. 4125 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4126 * or FOCUS_BACKWARD. 4127 * @return The user specified next view, or null if there is none. 4128 */ 4129 View findUserSetNextFocus(View root, int direction) { 4130 switch (direction) { 4131 case FOCUS_LEFT: 4132 if (mNextFocusLeftId == View.NO_ID) return null; 4133 return findViewShouldExist(root, mNextFocusLeftId); 4134 case FOCUS_RIGHT: 4135 if (mNextFocusRightId == View.NO_ID) return null; 4136 return findViewShouldExist(root, mNextFocusRightId); 4137 case FOCUS_UP: 4138 if (mNextFocusUpId == View.NO_ID) return null; 4139 return findViewShouldExist(root, mNextFocusUpId); 4140 case FOCUS_DOWN: 4141 if (mNextFocusDownId == View.NO_ID) return null; 4142 return findViewShouldExist(root, mNextFocusDownId); 4143 case FOCUS_FORWARD: 4144 if (mNextFocusForwardId == View.NO_ID) return null; 4145 return findViewShouldExist(root, mNextFocusForwardId); 4146 case FOCUS_BACKWARD: { 4147 final int id = mID; 4148 return root.findViewByPredicate(new Predicate<View>() { 4149 @Override 4150 public boolean apply(View t) { 4151 return t.mNextFocusForwardId == id; 4152 } 4153 }); 4154 } 4155 } 4156 return null; 4157 } 4158 4159 private static View findViewShouldExist(View root, int childViewId) { 4160 View result = root.findViewById(childViewId); 4161 if (result == null) { 4162 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4163 + "by user for id " + childViewId); 4164 } 4165 return result; 4166 } 4167 4168 /** 4169 * Find and return all focusable views that are descendants of this view, 4170 * possibly including this view if it is focusable itself. 4171 * 4172 * @param direction The direction of the focus 4173 * @return A list of focusable views 4174 */ 4175 public ArrayList<View> getFocusables(int direction) { 4176 ArrayList<View> result = new ArrayList<View>(24); 4177 addFocusables(result, direction); 4178 return result; 4179 } 4180 4181 /** 4182 * Add any focusable views that are descendants of this view (possibly 4183 * including this view if it is focusable itself) to views. If we are in touch mode, 4184 * only add views that are also focusable in touch mode. 4185 * 4186 * @param views Focusable views found so far 4187 * @param direction The direction of the focus 4188 */ 4189 public void addFocusables(ArrayList<View> views, int direction) { 4190 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4191 } 4192 4193 /** 4194 * Adds any focusable views that are descendants of this view (possibly 4195 * including this view if it is focusable itself) to views. This method 4196 * adds all focusable views regardless if we are in touch mode or 4197 * only views focusable in touch mode if we are in touch mode depending on 4198 * the focusable mode paramater. 4199 * 4200 * @param views Focusable views found so far or null if all we are interested is 4201 * the number of focusables. 4202 * @param direction The direction of the focus. 4203 * @param focusableMode The type of focusables to be added. 4204 * 4205 * @see #FOCUSABLES_ALL 4206 * @see #FOCUSABLES_TOUCH_MODE 4207 */ 4208 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4209 if (!isFocusable()) { 4210 return; 4211 } 4212 4213 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4214 isInTouchMode() && !isFocusableInTouchMode()) { 4215 return; 4216 } 4217 4218 if (views != null) { 4219 views.add(this); 4220 } 4221 } 4222 4223 /** 4224 * Find and return all touchable views that are descendants of this view, 4225 * possibly including this view if it is touchable itself. 4226 * 4227 * @return A list of touchable views 4228 */ 4229 public ArrayList<View> getTouchables() { 4230 ArrayList<View> result = new ArrayList<View>(); 4231 addTouchables(result); 4232 return result; 4233 } 4234 4235 /** 4236 * Add any touchable views that are descendants of this view (possibly 4237 * including this view if it is touchable itself) to views. 4238 * 4239 * @param views Touchable views found so far 4240 */ 4241 public void addTouchables(ArrayList<View> views) { 4242 final int viewFlags = mViewFlags; 4243 4244 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4245 && (viewFlags & ENABLED_MASK) == ENABLED) { 4246 views.add(this); 4247 } 4248 } 4249 4250 /** 4251 * Call this to try to give focus to a specific view or to one of its 4252 * descendants. 4253 * 4254 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4255 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4256 * while the device is in touch mode. 4257 * 4258 * See also {@link #focusSearch}, which is what you call to say that you 4259 * have focus, and you want your parent to look for the next one. 4260 * 4261 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4262 * {@link #FOCUS_DOWN} and <code>null</code>. 4263 * 4264 * @return Whether this view or one of its descendants actually took focus. 4265 */ 4266 public final boolean requestFocus() { 4267 return requestFocus(View.FOCUS_DOWN); 4268 } 4269 4270 4271 /** 4272 * Call this to try to give focus to a specific view or to one of its 4273 * descendants and give it a hint about what direction focus is heading. 4274 * 4275 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4276 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4277 * while the device is in touch mode. 4278 * 4279 * See also {@link #focusSearch}, which is what you call to say that you 4280 * have focus, and you want your parent to look for the next one. 4281 * 4282 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4283 * <code>null</code> set for the previously focused rectangle. 4284 * 4285 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4286 * @return Whether this view or one of its descendants actually took focus. 4287 */ 4288 public final boolean requestFocus(int direction) { 4289 return requestFocus(direction, null); 4290 } 4291 4292 /** 4293 * Call this to try to give focus to a specific view or to one of its descendants 4294 * and give it hints about the direction and a specific rectangle that the focus 4295 * is coming from. The rectangle can help give larger views a finer grained hint 4296 * about where focus is coming from, and therefore, where to show selection, or 4297 * forward focus change internally. 4298 * 4299 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4300 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4301 * while the device is in touch mode. 4302 * 4303 * A View will not take focus if it is not visible. 4304 * 4305 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 4306 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4307 * 4308 * See also {@link #focusSearch}, which is what you call to say that you 4309 * have focus, and you want your parent to look for the next one. 4310 * 4311 * You may wish to override this method if your custom {@link View} has an internal 4312 * {@link View} that it wishes to forward the request to. 4313 * 4314 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4315 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4316 * to give a finer grained hint about where focus is coming from. May be null 4317 * if there is no hint. 4318 * @return Whether this view or one of its descendants actually took focus. 4319 */ 4320 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4321 // need to be focusable 4322 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4323 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4324 return false; 4325 } 4326 4327 // need to be focusable in touch mode if in touch mode 4328 if (isInTouchMode() && 4329 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4330 return false; 4331 } 4332 4333 // need to not have any parents blocking us 4334 if (hasAncestorThatBlocksDescendantFocus()) { 4335 return false; 4336 } 4337 4338 handleFocusGainInternal(direction, previouslyFocusedRect); 4339 return true; 4340 } 4341 4342 /** Gets the ViewRoot, or null if not attached. */ 4343 /*package*/ ViewRoot getViewRoot() { 4344 View root = getRootView(); 4345 return root != null ? (ViewRoot)root.getParent() : null; 4346 } 4347 4348 /** 4349 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4350 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4351 * touch mode to request focus when they are touched. 4352 * 4353 * @return Whether this view or one of its descendants actually took focus. 4354 * 4355 * @see #isInTouchMode() 4356 * 4357 */ 4358 public final boolean requestFocusFromTouch() { 4359 // Leave touch mode if we need to 4360 if (isInTouchMode()) { 4361 ViewRoot viewRoot = getViewRoot(); 4362 if (viewRoot != null) { 4363 viewRoot.ensureTouchMode(false); 4364 } 4365 } 4366 return requestFocus(View.FOCUS_DOWN); 4367 } 4368 4369 /** 4370 * @return Whether any ancestor of this view blocks descendant focus. 4371 */ 4372 private boolean hasAncestorThatBlocksDescendantFocus() { 4373 ViewParent ancestor = mParent; 4374 while (ancestor instanceof ViewGroup) { 4375 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4376 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4377 return true; 4378 } else { 4379 ancestor = vgAncestor.getParent(); 4380 } 4381 } 4382 return false; 4383 } 4384 4385 /** 4386 * @hide 4387 */ 4388 public void dispatchStartTemporaryDetach() { 4389 onStartTemporaryDetach(); 4390 } 4391 4392 /** 4393 * This is called when a container is going to temporarily detach a child, with 4394 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4395 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4396 * {@link #onDetachedFromWindow()} when the container is done. 4397 */ 4398 public void onStartTemporaryDetach() { 4399 removeUnsetPressCallback(); 4400 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4401 } 4402 4403 /** 4404 * @hide 4405 */ 4406 public void dispatchFinishTemporaryDetach() { 4407 onFinishTemporaryDetach(); 4408 } 4409 4410 /** 4411 * Called after {@link #onStartTemporaryDetach} when the container is done 4412 * changing the view. 4413 */ 4414 public void onFinishTemporaryDetach() { 4415 } 4416 4417 /** 4418 * capture information of this view for later analysis: developement only 4419 * check dynamic switch to make sure we only dump view 4420 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4421 */ 4422 private static void captureViewInfo(String subTag, View v) { 4423 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4424 return; 4425 } 4426 ViewDebug.dumpCapturedView(subTag, v); 4427 } 4428 4429 /** 4430 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4431 * for this view's window. Returns null if the view is not currently attached 4432 * to the window. Normally you will not need to use this directly, but 4433 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4434 */ 4435 public KeyEvent.DispatcherState getKeyDispatcherState() { 4436 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4437 } 4438 4439 /** 4440 * Dispatch a key event before it is processed by any input method 4441 * associated with the view hierarchy. This can be used to intercept 4442 * key events in special situations before the IME consumes them; a 4443 * typical example would be handling the BACK key to update the application's 4444 * UI instead of allowing the IME to see it and close itself. 4445 * 4446 * @param event The key event to be dispatched. 4447 * @return True if the event was handled, false otherwise. 4448 */ 4449 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4450 return onKeyPreIme(event.getKeyCode(), event); 4451 } 4452 4453 /** 4454 * Dispatch a key event to the next view on the focus path. This path runs 4455 * from the top of the view tree down to the currently focused view. If this 4456 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4457 * the next node down the focus path. This method also fires any key 4458 * listeners. 4459 * 4460 * @param event The key event to be dispatched. 4461 * @return True if the event was handled, false otherwise. 4462 */ 4463 public boolean dispatchKeyEvent(KeyEvent event) { 4464 // If any attached key listener a first crack at the event. 4465 4466 //noinspection SimplifiableIfStatement,deprecation 4467 if (android.util.Config.LOGV) { 4468 captureViewInfo("captureViewKeyEvent", this); 4469 } 4470 4471 //noinspection SimplifiableIfStatement 4472 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4473 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4474 return true; 4475 } 4476 4477 return event.dispatch(this, mAttachInfo != null 4478 ? mAttachInfo.mKeyDispatchState : null, this); 4479 } 4480 4481 /** 4482 * Dispatches a key shortcut event. 4483 * 4484 * @param event The key event to be dispatched. 4485 * @return True if the event was handled by the view, false otherwise. 4486 */ 4487 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4488 return onKeyShortcut(event.getKeyCode(), event); 4489 } 4490 4491 /** 4492 * Pass the touch screen motion event down to the target view, or this 4493 * view if it is the target. 4494 * 4495 * @param event The motion event to be dispatched. 4496 * @return True if the event was handled by the view, false otherwise. 4497 */ 4498 public boolean dispatchTouchEvent(MotionEvent event) { 4499 if (!onFilterTouchEventForSecurity(event)) { 4500 return false; 4501 } 4502 4503 //noinspection SimplifiableIfStatement 4504 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4505 mOnTouchListener.onTouch(this, event)) { 4506 return true; 4507 } 4508 return onTouchEvent(event); 4509 } 4510 4511 /** 4512 * Filter the touch event to apply security policies. 4513 * 4514 * @param event The motion event to be filtered. 4515 * @return True if the event should be dispatched, false if the event should be dropped. 4516 * 4517 * @see #getFilterTouchesWhenObscured 4518 */ 4519 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4520 //noinspection RedundantIfStatement 4521 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4522 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4523 // Window is obscured, drop this touch. 4524 return false; 4525 } 4526 return true; 4527 } 4528 4529 /** 4530 * Pass a trackball motion event down to the focused view. 4531 * 4532 * @param event The motion event to be dispatched. 4533 * @return True if the event was handled by the view, false otherwise. 4534 */ 4535 public boolean dispatchTrackballEvent(MotionEvent event) { 4536 //Log.i("view", "view=" + this + ", " + event.toString()); 4537 return onTrackballEvent(event); 4538 } 4539 4540 /** 4541 * Pass a generic motion event down to the focused view. 4542 * 4543 * @param event The motion event to be dispatched. 4544 * @return True if the event was handled by the view, false otherwise. 4545 */ 4546 public boolean dispatchGenericMotionEvent(MotionEvent event) { 4547 return onGenericMotionEvent(event); 4548 } 4549 4550 /** 4551 * Called when the window containing this view gains or loses window focus. 4552 * ViewGroups should override to route to their children. 4553 * 4554 * @param hasFocus True if the window containing this view now has focus, 4555 * false otherwise. 4556 */ 4557 public void dispatchWindowFocusChanged(boolean hasFocus) { 4558 onWindowFocusChanged(hasFocus); 4559 } 4560 4561 /** 4562 * Called when the window containing this view gains or loses focus. Note 4563 * that this is separate from view focus: to receive key events, both 4564 * your view and its window must have focus. If a window is displayed 4565 * on top of yours that takes input focus, then your own window will lose 4566 * focus but the view focus will remain unchanged. 4567 * 4568 * @param hasWindowFocus True if the window containing this view now has 4569 * focus, false otherwise. 4570 */ 4571 public void onWindowFocusChanged(boolean hasWindowFocus) { 4572 InputMethodManager imm = InputMethodManager.peekInstance(); 4573 if (!hasWindowFocus) { 4574 if (isPressed()) { 4575 setPressed(false); 4576 } 4577 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4578 imm.focusOut(this); 4579 } 4580 removeLongPressCallback(); 4581 removeTapCallback(); 4582 onFocusLost(); 4583 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4584 imm.focusIn(this); 4585 } 4586 refreshDrawableState(); 4587 } 4588 4589 /** 4590 * Returns true if this view is in a window that currently has window focus. 4591 * Note that this is not the same as the view itself having focus. 4592 * 4593 * @return True if this view is in a window that currently has window focus. 4594 */ 4595 public boolean hasWindowFocus() { 4596 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4597 } 4598 4599 /** 4600 * Dispatch a view visibility change down the view hierarchy. 4601 * ViewGroups should override to route to their children. 4602 * @param changedView The view whose visibility changed. Could be 'this' or 4603 * an ancestor view. 4604 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4605 * {@link #INVISIBLE} or {@link #GONE}. 4606 */ 4607 protected void dispatchVisibilityChanged(View changedView, int visibility) { 4608 onVisibilityChanged(changedView, visibility); 4609 } 4610 4611 /** 4612 * Called when the visibility of the view or an ancestor of the view is changed. 4613 * @param changedView The view whose visibility changed. Could be 'this' or 4614 * an ancestor view. 4615 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4616 * {@link #INVISIBLE} or {@link #GONE}. 4617 */ 4618 protected void onVisibilityChanged(View changedView, int visibility) { 4619 if (visibility == VISIBLE) { 4620 if (mAttachInfo != null) { 4621 initialAwakenScrollBars(); 4622 } else { 4623 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4624 } 4625 } 4626 } 4627 4628 /** 4629 * Dispatch a hint about whether this view is displayed. For instance, when 4630 * a View moves out of the screen, it might receives a display hint indicating 4631 * the view is not displayed. Applications should not <em>rely</em> on this hint 4632 * as there is no guarantee that they will receive one. 4633 * 4634 * @param hint A hint about whether or not this view is displayed: 4635 * {@link #VISIBLE} or {@link #INVISIBLE}. 4636 */ 4637 public void dispatchDisplayHint(int hint) { 4638 onDisplayHint(hint); 4639 } 4640 4641 /** 4642 * Gives this view a hint about whether is displayed or not. For instance, when 4643 * a View moves out of the screen, it might receives a display hint indicating 4644 * the view is not displayed. Applications should not <em>rely</em> on this hint 4645 * as there is no guarantee that they will receive one. 4646 * 4647 * @param hint A hint about whether or not this view is displayed: 4648 * {@link #VISIBLE} or {@link #INVISIBLE}. 4649 */ 4650 protected void onDisplayHint(int hint) { 4651 } 4652 4653 /** 4654 * Dispatch a window visibility change down the view hierarchy. 4655 * ViewGroups should override to route to their children. 4656 * 4657 * @param visibility The new visibility of the window. 4658 * 4659 * @see #onWindowVisibilityChanged 4660 */ 4661 public void dispatchWindowVisibilityChanged(int visibility) { 4662 onWindowVisibilityChanged(visibility); 4663 } 4664 4665 /** 4666 * Called when the window containing has change its visibility 4667 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4668 * that this tells you whether or not your window is being made visible 4669 * to the window manager; this does <em>not</em> tell you whether or not 4670 * your window is obscured by other windows on the screen, even if it 4671 * is itself visible. 4672 * 4673 * @param visibility The new visibility of the window. 4674 */ 4675 protected void onWindowVisibilityChanged(int visibility) { 4676 if (visibility == VISIBLE) { 4677 initialAwakenScrollBars(); 4678 } 4679 } 4680 4681 /** 4682 * Returns the current visibility of the window this view is attached to 4683 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4684 * 4685 * @return Returns the current visibility of the view's window. 4686 */ 4687 public int getWindowVisibility() { 4688 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4689 } 4690 4691 /** 4692 * Retrieve the overall visible display size in which the window this view is 4693 * attached to has been positioned in. This takes into account screen 4694 * decorations above the window, for both cases where the window itself 4695 * is being position inside of them or the window is being placed under 4696 * then and covered insets are used for the window to position its content 4697 * inside. In effect, this tells you the available area where content can 4698 * be placed and remain visible to users. 4699 * 4700 * <p>This function requires an IPC back to the window manager to retrieve 4701 * the requested information, so should not be used in performance critical 4702 * code like drawing. 4703 * 4704 * @param outRect Filled in with the visible display frame. If the view 4705 * is not attached to a window, this is simply the raw display size. 4706 */ 4707 public void getWindowVisibleDisplayFrame(Rect outRect) { 4708 if (mAttachInfo != null) { 4709 try { 4710 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4711 } catch (RemoteException e) { 4712 return; 4713 } 4714 // XXX This is really broken, and probably all needs to be done 4715 // in the window manager, and we need to know more about whether 4716 // we want the area behind or in front of the IME. 4717 final Rect insets = mAttachInfo.mVisibleInsets; 4718 outRect.left += insets.left; 4719 outRect.top += insets.top; 4720 outRect.right -= insets.right; 4721 outRect.bottom -= insets.bottom; 4722 return; 4723 } 4724 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4725 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4726 } 4727 4728 /** 4729 * Dispatch a notification about a resource configuration change down 4730 * the view hierarchy. 4731 * ViewGroups should override to route to their children. 4732 * 4733 * @param newConfig The new resource configuration. 4734 * 4735 * @see #onConfigurationChanged 4736 */ 4737 public void dispatchConfigurationChanged(Configuration newConfig) { 4738 onConfigurationChanged(newConfig); 4739 } 4740 4741 /** 4742 * Called when the current configuration of the resources being used 4743 * by the application have changed. You can use this to decide when 4744 * to reload resources that can changed based on orientation and other 4745 * configuration characterstics. You only need to use this if you are 4746 * not relying on the normal {@link android.app.Activity} mechanism of 4747 * recreating the activity instance upon a configuration change. 4748 * 4749 * @param newConfig The new resource configuration. 4750 */ 4751 protected void onConfigurationChanged(Configuration newConfig) { 4752 } 4753 4754 /** 4755 * Private function to aggregate all per-view attributes in to the view 4756 * root. 4757 */ 4758 void dispatchCollectViewAttributes(int visibility) { 4759 performCollectViewAttributes(visibility); 4760 } 4761 4762 void performCollectViewAttributes(int visibility) { 4763 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 4764 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 4765 mAttachInfo.mKeepScreenOn = true; 4766 } 4767 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 4768 if (mOnSystemUiVisibilityChangeListener != null) { 4769 mAttachInfo.mHasSystemUiListeners = true; 4770 } 4771 } 4772 } 4773 4774 void needGlobalAttributesUpdate(boolean force) { 4775 final AttachInfo ai = mAttachInfo; 4776 if (ai != null) { 4777 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 4778 || ai.mHasSystemUiListeners) { 4779 ai.mRecomputeGlobalAttributes = true; 4780 } 4781 } 4782 } 4783 4784 /** 4785 * Returns whether the device is currently in touch mode. Touch mode is entered 4786 * once the user begins interacting with the device by touch, and affects various 4787 * things like whether focus is always visible to the user. 4788 * 4789 * @return Whether the device is in touch mode. 4790 */ 4791 @ViewDebug.ExportedProperty 4792 public boolean isInTouchMode() { 4793 if (mAttachInfo != null) { 4794 return mAttachInfo.mInTouchMode; 4795 } else { 4796 return ViewRoot.isInTouchMode(); 4797 } 4798 } 4799 4800 /** 4801 * Returns the context the view is running in, through which it can 4802 * access the current theme, resources, etc. 4803 * 4804 * @return The view's Context. 4805 */ 4806 @ViewDebug.CapturedViewProperty 4807 public final Context getContext() { 4808 return mContext; 4809 } 4810 4811 /** 4812 * Handle a key event before it is processed by any input method 4813 * associated with the view hierarchy. This can be used to intercept 4814 * key events in special situations before the IME consumes them; a 4815 * typical example would be handling the BACK key to update the application's 4816 * UI instead of allowing the IME to see it and close itself. 4817 * 4818 * @param keyCode The value in event.getKeyCode(). 4819 * @param event Description of the key event. 4820 * @return If you handled the event, return true. If you want to allow the 4821 * event to be handled by the next receiver, return false. 4822 */ 4823 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4824 return false; 4825 } 4826 4827 /** 4828 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 4829 * KeyEvent.Callback.onKeyDown()}: perform press of the view 4830 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4831 * is released, if the view is enabled and clickable. 4832 * 4833 * @param keyCode A key code that represents the button pressed, from 4834 * {@link android.view.KeyEvent}. 4835 * @param event The KeyEvent object that defines the button action. 4836 */ 4837 public boolean onKeyDown(int keyCode, KeyEvent event) { 4838 boolean result = false; 4839 4840 switch (keyCode) { 4841 case KeyEvent.KEYCODE_DPAD_CENTER: 4842 case KeyEvent.KEYCODE_ENTER: { 4843 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4844 return true; 4845 } 4846 // Long clickable items don't necessarily have to be clickable 4847 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4848 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4849 (event.getRepeatCount() == 0)) { 4850 setPressed(true); 4851 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4852 postCheckForLongClick(0); 4853 } 4854 return true; 4855 } 4856 break; 4857 } 4858 } 4859 return result; 4860 } 4861 4862 /** 4863 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4864 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4865 * the event). 4866 */ 4867 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 4868 return false; 4869 } 4870 4871 /** 4872 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 4873 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 4874 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 4875 * {@link KeyEvent#KEYCODE_ENTER} is released. 4876 * 4877 * @param keyCode A key code that represents the button pressed, from 4878 * {@link android.view.KeyEvent}. 4879 * @param event The KeyEvent object that defines the button action. 4880 */ 4881 public boolean onKeyUp(int keyCode, KeyEvent event) { 4882 boolean result = false; 4883 4884 switch (keyCode) { 4885 case KeyEvent.KEYCODE_DPAD_CENTER: 4886 case KeyEvent.KEYCODE_ENTER: { 4887 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4888 return true; 4889 } 4890 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 4891 setPressed(false); 4892 4893 if (!mHasPerformedLongPress) { 4894 // This is a tap, so remove the longpress check 4895 removeLongPressCallback(); 4896 4897 result = performClick(); 4898 } 4899 } 4900 break; 4901 } 4902 } 4903 return result; 4904 } 4905 4906 /** 4907 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4908 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 4909 * the event). 4910 * 4911 * @param keyCode A key code that represents the button pressed, from 4912 * {@link android.view.KeyEvent}. 4913 * @param repeatCount The number of times the action was made. 4914 * @param event The KeyEvent object that defines the button action. 4915 */ 4916 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 4917 return false; 4918 } 4919 4920 /** 4921 * Called on the focused view when a key shortcut event is not handled. 4922 * Override this method to implement local key shortcuts for the View. 4923 * Key shortcuts can also be implemented by setting the 4924 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 4925 * 4926 * @param keyCode The value in event.getKeyCode(). 4927 * @param event Description of the key event. 4928 * @return If you handled the event, return true. If you want to allow the 4929 * event to be handled by the next receiver, return false. 4930 */ 4931 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 4932 return false; 4933 } 4934 4935 /** 4936 * Check whether the called view is a text editor, in which case it 4937 * would make sense to automatically display a soft input window for 4938 * it. Subclasses should override this if they implement 4939 * {@link #onCreateInputConnection(EditorInfo)} to return true if 4940 * a call on that method would return a non-null InputConnection, and 4941 * they are really a first-class editor that the user would normally 4942 * start typing on when the go into a window containing your view. 4943 * 4944 * <p>The default implementation always returns false. This does 4945 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 4946 * will not be called or the user can not otherwise perform edits on your 4947 * view; it is just a hint to the system that this is not the primary 4948 * purpose of this view. 4949 * 4950 * @return Returns true if this view is a text editor, else false. 4951 */ 4952 public boolean onCheckIsTextEditor() { 4953 return false; 4954 } 4955 4956 /** 4957 * Create a new InputConnection for an InputMethod to interact 4958 * with the view. The default implementation returns null, since it doesn't 4959 * support input methods. You can override this to implement such support. 4960 * This is only needed for views that take focus and text input. 4961 * 4962 * <p>When implementing this, you probably also want to implement 4963 * {@link #onCheckIsTextEditor()} to indicate you will return a 4964 * non-null InputConnection. 4965 * 4966 * @param outAttrs Fill in with attribute information about the connection. 4967 */ 4968 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 4969 return null; 4970 } 4971 4972 /** 4973 * Called by the {@link android.view.inputmethod.InputMethodManager} 4974 * when a view who is not the current 4975 * input connection target is trying to make a call on the manager. The 4976 * default implementation returns false; you can override this to return 4977 * true for certain views if you are performing InputConnection proxying 4978 * to them. 4979 * @param view The View that is making the InputMethodManager call. 4980 * @return Return true to allow the call, false to reject. 4981 */ 4982 public boolean checkInputConnectionProxy(View view) { 4983 return false; 4984 } 4985 4986 /** 4987 * Show the context menu for this view. It is not safe to hold on to the 4988 * menu after returning from this method. 4989 * 4990 * You should normally not overload this method. Overload 4991 * {@link #onCreateContextMenu(ContextMenu)} or define an 4992 * {@link OnCreateContextMenuListener} to add items to the context menu. 4993 * 4994 * @param menu The context menu to populate 4995 */ 4996 public void createContextMenu(ContextMenu menu) { 4997 ContextMenuInfo menuInfo = getContextMenuInfo(); 4998 4999 // Sets the current menu info so all items added to menu will have 5000 // my extra info set. 5001 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 5002 5003 onCreateContextMenu(menu); 5004 if (mOnCreateContextMenuListener != null) { 5005 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 5006 } 5007 5008 // Clear the extra information so subsequent items that aren't mine don't 5009 // have my extra info. 5010 ((MenuBuilder)menu).setCurrentMenuInfo(null); 5011 5012 if (mParent != null) { 5013 mParent.createContextMenu(menu); 5014 } 5015 } 5016 5017 /** 5018 * Views should implement this if they have extra information to associate 5019 * with the context menu. The return result is supplied as a parameter to 5020 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 5021 * callback. 5022 * 5023 * @return Extra information about the item for which the context menu 5024 * should be shown. This information will vary across different 5025 * subclasses of View. 5026 */ 5027 protected ContextMenuInfo getContextMenuInfo() { 5028 return null; 5029 } 5030 5031 /** 5032 * Views should implement this if the view itself is going to add items to 5033 * the context menu. 5034 * 5035 * @param menu the context menu to populate 5036 */ 5037 protected void onCreateContextMenu(ContextMenu menu) { 5038 } 5039 5040 /** 5041 * Implement this method to handle trackball motion events. The 5042 * <em>relative</em> movement of the trackball since the last event 5043 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 5044 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 5045 * that a movement of 1 corresponds to the user pressing one DPAD key (so 5046 * they will often be fractional values, representing the more fine-grained 5047 * movement information available from a trackball). 5048 * 5049 * @param event The motion event. 5050 * @return True if the event was handled, false otherwise. 5051 */ 5052 public boolean onTrackballEvent(MotionEvent event) { 5053 return false; 5054 } 5055 5056 /** 5057 * Implement this method to handle generic motion events. 5058 * <p> 5059 * Generic motion events are dispatched to the focused view to describe 5060 * the motions of input devices such as joysticks. The 5061 * {@link MotionEvent#getSource() source} of the motion event specifies 5062 * the class of input that was received. Implementations of this method 5063 * must examine the bits in the source before processing the event. 5064 * The following code example shows how this is done. 5065 * </p> 5066 * <code> 5067 * public boolean onGenericMotionEvent(MotionEvent event) { 5068 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 5069 * float x = event.getX(); 5070 * float y = event.getY(); 5071 * // process the joystick motion 5072 * return true; 5073 * } 5074 * return super.onGenericMotionEvent(event); 5075 * } 5076 * </code> 5077 * 5078 * @param event The generic motion event being processed. 5079 * 5080 * @return Return true if you have consumed the event, false if you haven't. 5081 * The default implementation always returns false. 5082 */ 5083 public boolean onGenericMotionEvent(MotionEvent event) { 5084 return false; 5085 } 5086 5087 /** 5088 * Implement this method to handle touch screen motion events. 5089 * 5090 * @param event The motion event. 5091 * @return True if the event was handled, false otherwise. 5092 */ 5093 public boolean onTouchEvent(MotionEvent event) { 5094 final int viewFlags = mViewFlags; 5095 5096 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5097 // A disabled view that is clickable still consumes the touch 5098 // events, it just doesn't respond to them. 5099 return (((viewFlags & CLICKABLE) == CLICKABLE || 5100 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5101 } 5102 5103 if (mTouchDelegate != null) { 5104 if (mTouchDelegate.onTouchEvent(event)) { 5105 return true; 5106 } 5107 } 5108 5109 if (((viewFlags & CLICKABLE) == CLICKABLE || 5110 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5111 switch (event.getAction()) { 5112 case MotionEvent.ACTION_UP: 5113 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5114 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5115 // take focus if we don't have it already and we should in 5116 // touch mode. 5117 boolean focusTaken = false; 5118 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5119 focusTaken = requestFocus(); 5120 } 5121 5122 if (prepressed) { 5123 // The button is being released before we actually 5124 // showed it as pressed. Make it show the pressed 5125 // state now (before scheduling the click) to ensure 5126 // the user sees it. 5127 mPrivateFlags |= PRESSED; 5128 refreshDrawableState(); 5129 } 5130 5131 if (!mHasPerformedLongPress) { 5132 // This is a tap, so remove the longpress check 5133 removeLongPressCallback(); 5134 5135 // Only perform take click actions if we were in the pressed state 5136 if (!focusTaken) { 5137 // Use a Runnable and post this rather than calling 5138 // performClick directly. This lets other visual state 5139 // of the view update before click actions start. 5140 if (mPerformClick == null) { 5141 mPerformClick = new PerformClick(); 5142 } 5143 if (!post(mPerformClick)) { 5144 performClick(); 5145 } 5146 } 5147 } 5148 5149 if (mUnsetPressedState == null) { 5150 mUnsetPressedState = new UnsetPressedState(); 5151 } 5152 5153 if (prepressed) { 5154 postDelayed(mUnsetPressedState, 5155 ViewConfiguration.getPressedStateDuration()); 5156 } else if (!post(mUnsetPressedState)) { 5157 // If the post failed, unpress right now 5158 mUnsetPressedState.run(); 5159 } 5160 removeTapCallback(); 5161 } 5162 break; 5163 5164 case MotionEvent.ACTION_DOWN: 5165 if (mPendingCheckForTap == null) { 5166 mPendingCheckForTap = new CheckForTap(); 5167 } 5168 mPrivateFlags |= PREPRESSED; 5169 mHasPerformedLongPress = false; 5170 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5171 break; 5172 5173 case MotionEvent.ACTION_CANCEL: 5174 mPrivateFlags &= ~PRESSED; 5175 refreshDrawableState(); 5176 removeTapCallback(); 5177 break; 5178 5179 case MotionEvent.ACTION_MOVE: 5180 final int x = (int) event.getX(); 5181 final int y = (int) event.getY(); 5182 5183 // Be lenient about moving outside of buttons 5184 if (!pointInView(x, y, mTouchSlop)) { 5185 // Outside button 5186 removeTapCallback(); 5187 if ((mPrivateFlags & PRESSED) != 0) { 5188 // Remove any future long press/tap checks 5189 removeLongPressCallback(); 5190 5191 // Need to switch from pressed to not pressed 5192 mPrivateFlags &= ~PRESSED; 5193 refreshDrawableState(); 5194 } 5195 } 5196 break; 5197 } 5198 return true; 5199 } 5200 5201 return false; 5202 } 5203 5204 /** 5205 * Remove the longpress detection timer. 5206 */ 5207 private void removeLongPressCallback() { 5208 if (mPendingCheckForLongPress != null) { 5209 removeCallbacks(mPendingCheckForLongPress); 5210 } 5211 } 5212 5213 /** 5214 * Remove the pending click action 5215 */ 5216 private void removePerformClickCallback() { 5217 if (mPerformClick != null) { 5218 removeCallbacks(mPerformClick); 5219 } 5220 } 5221 5222 /** 5223 * Remove the prepress detection timer. 5224 */ 5225 private void removeUnsetPressCallback() { 5226 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5227 setPressed(false); 5228 removeCallbacks(mUnsetPressedState); 5229 } 5230 } 5231 5232 /** 5233 * Remove the tap detection timer. 5234 */ 5235 private void removeTapCallback() { 5236 if (mPendingCheckForTap != null) { 5237 mPrivateFlags &= ~PREPRESSED; 5238 removeCallbacks(mPendingCheckForTap); 5239 } 5240 } 5241 5242 /** 5243 * Cancels a pending long press. Your subclass can use this if you 5244 * want the context menu to come up if the user presses and holds 5245 * at the same place, but you don't want it to come up if they press 5246 * and then move around enough to cause scrolling. 5247 */ 5248 public void cancelLongPress() { 5249 removeLongPressCallback(); 5250 5251 /* 5252 * The prepressed state handled by the tap callback is a display 5253 * construct, but the tap callback will post a long press callback 5254 * less its own timeout. Remove it here. 5255 */ 5256 removeTapCallback(); 5257 } 5258 5259 /** 5260 * Sets the TouchDelegate for this View. 5261 */ 5262 public void setTouchDelegate(TouchDelegate delegate) { 5263 mTouchDelegate = delegate; 5264 } 5265 5266 /** 5267 * Gets the TouchDelegate for this View. 5268 */ 5269 public TouchDelegate getTouchDelegate() { 5270 return mTouchDelegate; 5271 } 5272 5273 /** 5274 * Set flags controlling behavior of this view. 5275 * 5276 * @param flags Constant indicating the value which should be set 5277 * @param mask Constant indicating the bit range that should be changed 5278 */ 5279 void setFlags(int flags, int mask) { 5280 int old = mViewFlags; 5281 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5282 5283 int changed = mViewFlags ^ old; 5284 if (changed == 0) { 5285 return; 5286 } 5287 int privateFlags = mPrivateFlags; 5288 5289 /* Check if the FOCUSABLE bit has changed */ 5290 if (((changed & FOCUSABLE_MASK) != 0) && 5291 ((privateFlags & HAS_BOUNDS) !=0)) { 5292 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5293 && ((privateFlags & FOCUSED) != 0)) { 5294 /* Give up focus if we are no longer focusable */ 5295 clearFocus(); 5296 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 5297 && ((privateFlags & FOCUSED) == 0)) { 5298 /* 5299 * Tell the view system that we are now available to take focus 5300 * if no one else already has it. 5301 */ 5302 if (mParent != null) mParent.focusableViewAvailable(this); 5303 } 5304 } 5305 5306 if ((flags & VISIBILITY_MASK) == VISIBLE) { 5307 if ((changed & VISIBILITY_MASK) != 0) { 5308 /* 5309 * If this view is becoming visible, set the DRAWN flag so that 5310 * the next invalidate() will not be skipped. 5311 */ 5312 mPrivateFlags |= DRAWN; 5313 5314 needGlobalAttributesUpdate(true); 5315 5316 // a view becoming visible is worth notifying the parent 5317 // about in case nothing has focus. even if this specific view 5318 // isn't focusable, it may contain something that is, so let 5319 // the root view try to give this focus if nothing else does. 5320 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 5321 mParent.focusableViewAvailable(this); 5322 } 5323 } 5324 } 5325 5326 /* Check if the GONE bit has changed */ 5327 if ((changed & GONE) != 0) { 5328 needGlobalAttributesUpdate(false); 5329 requestLayout(); 5330 invalidate(); 5331 5332 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 5333 if (hasFocus()) clearFocus(); 5334 destroyDrawingCache(); 5335 } 5336 if (mAttachInfo != null) { 5337 mAttachInfo.mViewVisibilityChanged = true; 5338 } 5339 } 5340 5341 /* Check if the VISIBLE bit has changed */ 5342 if ((changed & INVISIBLE) != 0) { 5343 needGlobalAttributesUpdate(false); 5344 invalidate(); 5345 5346 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 5347 // root view becoming invisible shouldn't clear focus 5348 if (getRootView() != this) { 5349 clearFocus(); 5350 } 5351 } 5352 if (mAttachInfo != null) { 5353 mAttachInfo.mViewVisibilityChanged = true; 5354 } 5355 } 5356 5357 if ((changed & VISIBILITY_MASK) != 0) { 5358 if (mParent instanceof ViewGroup) { 5359 ((ViewGroup)mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5360 ((View) mParent).invalidate(); 5361 } 5362 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5363 } 5364 5365 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 5366 destroyDrawingCache(); 5367 } 5368 5369 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 5370 destroyDrawingCache(); 5371 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5372 invalidateParentIfAccelerated(); 5373 } 5374 5375 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 5376 destroyDrawingCache(); 5377 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5378 } 5379 5380 if ((changed & DRAW_MASK) != 0) { 5381 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 5382 if (mBGDrawable != null) { 5383 mPrivateFlags &= ~SKIP_DRAW; 5384 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 5385 } else { 5386 mPrivateFlags |= SKIP_DRAW; 5387 } 5388 } else { 5389 mPrivateFlags &= ~SKIP_DRAW; 5390 } 5391 requestLayout(); 5392 invalidate(); 5393 } 5394 5395 if ((changed & KEEP_SCREEN_ON) != 0) { 5396 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 5397 mParent.recomputeViewAttributes(this); 5398 } 5399 } 5400 } 5401 5402 /** 5403 * Change the view's z order in the tree, so it's on top of other sibling 5404 * views 5405 */ 5406 public void bringToFront() { 5407 if (mParent != null) { 5408 mParent.bringChildToFront(this); 5409 } 5410 } 5411 5412 /** 5413 * This is called in response to an internal scroll in this view (i.e., the 5414 * view scrolled its own contents). This is typically as a result of 5415 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 5416 * called. 5417 * 5418 * @param l Current horizontal scroll origin. 5419 * @param t Current vertical scroll origin. 5420 * @param oldl Previous horizontal scroll origin. 5421 * @param oldt Previous vertical scroll origin. 5422 */ 5423 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 5424 mBackgroundSizeChanged = true; 5425 5426 final AttachInfo ai = mAttachInfo; 5427 if (ai != null) { 5428 ai.mViewScrollChanged = true; 5429 } 5430 } 5431 5432 /** 5433 * Interface definition for a callback to be invoked when the layout bounds of a view 5434 * changes due to layout processing. 5435 */ 5436 public interface OnLayoutChangeListener { 5437 /** 5438 * Called when the focus state of a view has changed. 5439 * 5440 * @param v The view whose state has changed. 5441 * @param left The new value of the view's left property. 5442 * @param top The new value of the view's top property. 5443 * @param right The new value of the view's right property. 5444 * @param bottom The new value of the view's bottom property. 5445 * @param oldLeft The previous value of the view's left property. 5446 * @param oldTop The previous value of the view's top property. 5447 * @param oldRight The previous value of the view's right property. 5448 * @param oldBottom The previous value of the view's bottom property. 5449 */ 5450 void onLayoutChange(View v, int left, int top, int right, int bottom, 5451 int oldLeft, int oldTop, int oldRight, int oldBottom); 5452 } 5453 5454 /** 5455 * This is called during layout when the size of this view has changed. If 5456 * you were just added to the view hierarchy, you're called with the old 5457 * values of 0. 5458 * 5459 * @param w Current width of this view. 5460 * @param h Current height of this view. 5461 * @param oldw Old width of this view. 5462 * @param oldh Old height of this view. 5463 */ 5464 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5465 } 5466 5467 /** 5468 * Called by draw to draw the child views. This may be overridden 5469 * by derived classes to gain control just before its children are drawn 5470 * (but after its own view has been drawn). 5471 * @param canvas the canvas on which to draw the view 5472 */ 5473 protected void dispatchDraw(Canvas canvas) { 5474 } 5475 5476 /** 5477 * Gets the parent of this view. Note that the parent is a 5478 * ViewParent and not necessarily a View. 5479 * 5480 * @return Parent of this view. 5481 */ 5482 public final ViewParent getParent() { 5483 return mParent; 5484 } 5485 5486 /** 5487 * Return the scrolled left position of this view. This is the left edge of 5488 * the displayed part of your view. You do not need to draw any pixels 5489 * farther left, since those are outside of the frame of your view on 5490 * screen. 5491 * 5492 * @return The left edge of the displayed part of your view, in pixels. 5493 */ 5494 public final int getScrollX() { 5495 return mScrollX; 5496 } 5497 5498 /** 5499 * Return the scrolled top position of this view. This is the top edge of 5500 * the displayed part of your view. You do not need to draw any pixels above 5501 * it, since those are outside of the frame of your view on screen. 5502 * 5503 * @return The top edge of the displayed part of your view, in pixels. 5504 */ 5505 public final int getScrollY() { 5506 return mScrollY; 5507 } 5508 5509 /** 5510 * Return the width of the your view. 5511 * 5512 * @return The width of your view, in pixels. 5513 */ 5514 @ViewDebug.ExportedProperty(category = "layout") 5515 public final int getWidth() { 5516 return mRight - mLeft; 5517 } 5518 5519 /** 5520 * Return the height of your view. 5521 * 5522 * @return The height of your view, in pixels. 5523 */ 5524 @ViewDebug.ExportedProperty(category = "layout") 5525 public final int getHeight() { 5526 return mBottom - mTop; 5527 } 5528 5529 /** 5530 * Return the visible drawing bounds of your view. Fills in the output 5531 * rectangle with the values from getScrollX(), getScrollY(), 5532 * getWidth(), and getHeight(). 5533 * 5534 * @param outRect The (scrolled) drawing bounds of the view. 5535 */ 5536 public void getDrawingRect(Rect outRect) { 5537 outRect.left = mScrollX; 5538 outRect.top = mScrollY; 5539 outRect.right = mScrollX + (mRight - mLeft); 5540 outRect.bottom = mScrollY + (mBottom - mTop); 5541 } 5542 5543 /** 5544 * Like {@link #getMeasuredWidthAndState()}, but only returns the 5545 * raw width component (that is the result is masked by 5546 * {@link #MEASURED_SIZE_MASK}). 5547 * 5548 * @return The raw measured width of this view. 5549 */ 5550 public final int getMeasuredWidth() { 5551 return mMeasuredWidth & MEASURED_SIZE_MASK; 5552 } 5553 5554 /** 5555 * Return the full width measurement information for this view as computed 5556 * by the most recent call to {@link #measure}. This result is a bit mask 5557 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5558 * This should be used during measurement and layout calculations only. Use 5559 * {@link #getWidth()} to see how wide a view is after layout. 5560 * 5561 * @return The measured width of this view as a bit mask. 5562 */ 5563 public final int getMeasuredWidthAndState() { 5564 return mMeasuredWidth; 5565 } 5566 5567 /** 5568 * Like {@link #getMeasuredHeightAndState()}, but only returns the 5569 * raw width component (that is the result is masked by 5570 * {@link #MEASURED_SIZE_MASK}). 5571 * 5572 * @return The raw measured height of this view. 5573 */ 5574 public final int getMeasuredHeight() { 5575 return mMeasuredHeight & MEASURED_SIZE_MASK; 5576 } 5577 5578 /** 5579 * Return the full height measurement information for this view as computed 5580 * by the most recent call to {@link #measure}. This result is a bit mask 5581 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5582 * This should be used during measurement and layout calculations only. Use 5583 * {@link #getHeight()} to see how wide a view is after layout. 5584 * 5585 * @return The measured width of this view as a bit mask. 5586 */ 5587 public final int getMeasuredHeightAndState() { 5588 return mMeasuredHeight; 5589 } 5590 5591 /** 5592 * Return only the state bits of {@link #getMeasuredWidthAndState()} 5593 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 5594 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 5595 * and the height component is at the shifted bits 5596 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 5597 */ 5598 public final int getMeasuredState() { 5599 return (mMeasuredWidth&MEASURED_STATE_MASK) 5600 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 5601 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 5602 } 5603 5604 /** 5605 * The transform matrix of this view, which is calculated based on the current 5606 * roation, scale, and pivot properties. 5607 * 5608 * @see #getRotation() 5609 * @see #getScaleX() 5610 * @see #getScaleY() 5611 * @see #getPivotX() 5612 * @see #getPivotY() 5613 * @return The current transform matrix for the view 5614 */ 5615 public Matrix getMatrix() { 5616 updateMatrix(); 5617 return mMatrix; 5618 } 5619 5620 /** 5621 * Utility function to determine if the value is far enough away from zero to be 5622 * considered non-zero. 5623 * @param value A floating point value to check for zero-ness 5624 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5625 */ 5626 private static boolean nonzero(float value) { 5627 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5628 } 5629 5630 /** 5631 * Returns true if the transform matrix is the identity matrix. 5632 * Recomputes the matrix if necessary. 5633 * 5634 * @return True if the transform matrix is the identity matrix, false otherwise. 5635 */ 5636 final boolean hasIdentityMatrix() { 5637 updateMatrix(); 5638 return mMatrixIsIdentity; 5639 } 5640 5641 /** 5642 * Recomputes the transform matrix if necessary. 5643 */ 5644 private void updateMatrix() { 5645 if (mMatrixDirty) { 5646 // transform-related properties have changed since the last time someone 5647 // asked for the matrix; recalculate it with the current values 5648 5649 // Figure out if we need to update the pivot point 5650 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5651 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 5652 mPrevWidth = mRight - mLeft; 5653 mPrevHeight = mBottom - mTop; 5654 mPivotX = mPrevWidth / 2f; 5655 mPivotY = mPrevHeight / 2f; 5656 } 5657 } 5658 mMatrix.reset(); 5659 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5660 mMatrix.setTranslate(mTranslationX, mTranslationY); 5661 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5662 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5663 } else { 5664 if (mCamera == null) { 5665 mCamera = new Camera(); 5666 matrix3D = new Matrix(); 5667 } 5668 mCamera.save(); 5669 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5670 mCamera.rotateX(mRotationX); 5671 mCamera.rotateY(mRotationY); 5672 mCamera.rotateZ(-mRotation); 5673 mCamera.getMatrix(matrix3D); 5674 matrix3D.preTranslate(-mPivotX, -mPivotY); 5675 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5676 mMatrix.postConcat(matrix3D); 5677 mCamera.restore(); 5678 } 5679 mMatrixDirty = false; 5680 mMatrixIsIdentity = mMatrix.isIdentity(); 5681 mInverseMatrixDirty = true; 5682 } 5683 } 5684 5685 /** 5686 * Utility method to retrieve the inverse of the current mMatrix property. 5687 * We cache the matrix to avoid recalculating it when transform properties 5688 * have not changed. 5689 * 5690 * @return The inverse of the current matrix of this view. 5691 */ 5692 final Matrix getInverseMatrix() { 5693 updateMatrix(); 5694 if (mInverseMatrixDirty) { 5695 if (mInverseMatrix == null) { 5696 mInverseMatrix = new Matrix(); 5697 } 5698 mMatrix.invert(mInverseMatrix); 5699 mInverseMatrixDirty = false; 5700 } 5701 return mInverseMatrix; 5702 } 5703 5704 /** 5705 * The degrees that the view is rotated around the pivot point. 5706 * 5707 * @see #getPivotX() 5708 * @see #getPivotY() 5709 * @return The degrees of rotation. 5710 */ 5711 public float getRotation() { 5712 return mRotation; 5713 } 5714 5715 /** 5716 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5717 * result in clockwise rotation. 5718 * 5719 * @param rotation The degrees of rotation. 5720 * @see #getPivotX() 5721 * @see #getPivotY() 5722 * 5723 * @attr ref android.R.styleable#View_rotation 5724 */ 5725 public void setRotation(float rotation) { 5726 if (mRotation != rotation) { 5727 // Double-invalidation is necessary to capture view's old and new areas 5728 invalidate(false); 5729 mRotation = rotation; 5730 mMatrixDirty = true; 5731 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5732 invalidate(false); 5733 invalidateParentIfAccelerated(); 5734 } 5735 } 5736 5737 /** 5738 * The degrees that the view is rotated around the vertical axis through the pivot point. 5739 * 5740 * @see #getPivotX() 5741 * @see #getPivotY() 5742 * @return The degrees of Y rotation. 5743 */ 5744 public float getRotationY() { 5745 return mRotationY; 5746 } 5747 5748 /** 5749 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5750 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5751 * down the y axis. 5752 * 5753 * @param rotationY The degrees of Y rotation. 5754 * @see #getPivotX() 5755 * @see #getPivotY() 5756 * 5757 * @attr ref android.R.styleable#View_rotationY 5758 */ 5759 public void setRotationY(float rotationY) { 5760 if (mRotationY != rotationY) { 5761 // Double-invalidation is necessary to capture view's old and new areas 5762 invalidate(false); 5763 mRotationY = rotationY; 5764 mMatrixDirty = true; 5765 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5766 invalidate(false); 5767 invalidateParentIfAccelerated(); 5768 } 5769 } 5770 5771 /** 5772 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5773 * 5774 * @see #getPivotX() 5775 * @see #getPivotY() 5776 * @return The degrees of X rotation. 5777 */ 5778 public float getRotationX() { 5779 return mRotationX; 5780 } 5781 5782 /** 5783 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 5784 * Increasing values result in clockwise rotation from the viewpoint of looking down the 5785 * x axis. 5786 * 5787 * @param rotationX The degrees of X rotation. 5788 * @see #getPivotX() 5789 * @see #getPivotY() 5790 * 5791 * @attr ref android.R.styleable#View_rotationX 5792 */ 5793 public void setRotationX(float rotationX) { 5794 if (mRotationX != rotationX) { 5795 // Double-invalidation is necessary to capture view's old and new areas 5796 invalidate(false); 5797 mRotationX = rotationX; 5798 mMatrixDirty = true; 5799 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5800 invalidate(false); 5801 invalidateParentIfAccelerated(); 5802 } 5803 } 5804 5805 /** 5806 * The amount that the view is scaled in x around the pivot point, as a proportion of 5807 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 5808 * 5809 * <p>By default, this is 1.0f. 5810 * 5811 * @see #getPivotX() 5812 * @see #getPivotY() 5813 * @return The scaling factor. 5814 */ 5815 public float getScaleX() { 5816 return mScaleX; 5817 } 5818 5819 /** 5820 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 5821 * the view's unscaled width. A value of 1 means that no scaling is applied. 5822 * 5823 * @param scaleX The scaling factor. 5824 * @see #getPivotX() 5825 * @see #getPivotY() 5826 * 5827 * @attr ref android.R.styleable#View_scaleX 5828 */ 5829 public void setScaleX(float scaleX) { 5830 if (mScaleX != scaleX) { 5831 // Double-invalidation is necessary to capture view's old and new areas 5832 invalidate(false); 5833 mScaleX = scaleX; 5834 mMatrixDirty = true; 5835 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5836 invalidate(false); 5837 invalidateParentIfAccelerated(); 5838 } 5839 } 5840 5841 /** 5842 * The amount that the view is scaled in y around the pivot point, as a proportion of 5843 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 5844 * 5845 * <p>By default, this is 1.0f. 5846 * 5847 * @see #getPivotX() 5848 * @see #getPivotY() 5849 * @return The scaling factor. 5850 */ 5851 public float getScaleY() { 5852 return mScaleY; 5853 } 5854 5855 /** 5856 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 5857 * the view's unscaled width. A value of 1 means that no scaling is applied. 5858 * 5859 * @param scaleY The scaling factor. 5860 * @see #getPivotX() 5861 * @see #getPivotY() 5862 * 5863 * @attr ref android.R.styleable#View_scaleY 5864 */ 5865 public void setScaleY(float scaleY) { 5866 if (mScaleY != scaleY) { 5867 // Double-invalidation is necessary to capture view's old and new areas 5868 invalidate(false); 5869 mScaleY = scaleY; 5870 mMatrixDirty = true; 5871 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5872 invalidate(false); 5873 invalidateParentIfAccelerated(); 5874 } 5875 } 5876 5877 /** 5878 * The x location of the point around which the view is {@link #setRotation(float) rotated} 5879 * and {@link #setScaleX(float) scaled}. 5880 * 5881 * @see #getRotation() 5882 * @see #getScaleX() 5883 * @see #getScaleY() 5884 * @see #getPivotY() 5885 * @return The x location of the pivot point. 5886 */ 5887 public float getPivotX() { 5888 return mPivotX; 5889 } 5890 5891 /** 5892 * Sets the x location of the point around which the view is 5893 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 5894 * By default, the pivot point is centered on the object. 5895 * Setting this property disables this behavior and causes the view to use only the 5896 * explicitly set pivotX and pivotY values. 5897 * 5898 * @param pivotX The x location of the pivot point. 5899 * @see #getRotation() 5900 * @see #getScaleX() 5901 * @see #getScaleY() 5902 * @see #getPivotY() 5903 * 5904 * @attr ref android.R.styleable#View_transformPivotX 5905 */ 5906 public void setPivotX(float pivotX) { 5907 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5908 if (mPivotX != pivotX) { 5909 // Double-invalidation is necessary to capture view's old and new areas 5910 invalidate(false); 5911 mPivotX = pivotX; 5912 mMatrixDirty = true; 5913 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5914 invalidate(false); 5915 invalidateParentIfAccelerated(); 5916 } 5917 } 5918 5919 /** 5920 * The y location of the point around which the view is {@link #setRotation(float) rotated} 5921 * and {@link #setScaleY(float) scaled}. 5922 * 5923 * @see #getRotation() 5924 * @see #getScaleX() 5925 * @see #getScaleY() 5926 * @see #getPivotY() 5927 * @return The y location of the pivot point. 5928 */ 5929 public float getPivotY() { 5930 return mPivotY; 5931 } 5932 5933 /** 5934 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 5935 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 5936 * Setting this property disables this behavior and causes the view to use only the 5937 * explicitly set pivotX and pivotY values. 5938 * 5939 * @param pivotY The y location of the pivot point. 5940 * @see #getRotation() 5941 * @see #getScaleX() 5942 * @see #getScaleY() 5943 * @see #getPivotY() 5944 * 5945 * @attr ref android.R.styleable#View_transformPivotY 5946 */ 5947 public void setPivotY(float pivotY) { 5948 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5949 if (mPivotY != pivotY) { 5950 // Double-invalidation is necessary to capture view's old and new areas 5951 invalidate(false); 5952 mPivotY = pivotY; 5953 mMatrixDirty = true; 5954 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5955 invalidate(false); 5956 invalidateParentIfAccelerated(); 5957 } 5958 } 5959 5960 /** 5961 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 5962 * completely transparent and 1 means the view is completely opaque. 5963 * 5964 * <p>By default this is 1.0f. 5965 * @return The opacity of the view. 5966 */ 5967 public float getAlpha() { 5968 return mAlpha; 5969 } 5970 5971 /** 5972 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 5973 * completely transparent and 1 means the view is completely opaque.</p> 5974 * 5975 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 5976 * responsible for applying the opacity itself. Otherwise, calling this method is 5977 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 5978 * setting a hardware layer.</p> 5979 * 5980 * @param alpha The opacity of the view. 5981 * 5982 * @see #setLayerType(int, android.graphics.Paint) 5983 * 5984 * @attr ref android.R.styleable#View_alpha 5985 */ 5986 public void setAlpha(float alpha) { 5987 mAlpha = alpha; 5988 if (onSetAlpha((int) (alpha * 255))) { 5989 mPrivateFlags |= ALPHA_SET; 5990 // subclass is handling alpha - don't optimize rendering cache invalidation 5991 invalidate(); 5992 } else { 5993 mPrivateFlags &= ~ALPHA_SET; 5994 invalidate(false); 5995 } 5996 invalidateParentIfAccelerated(); 5997 } 5998 5999 /** 6000 * Top position of this view relative to its parent. 6001 * 6002 * @return The top of this view, in pixels. 6003 */ 6004 @ViewDebug.CapturedViewProperty 6005 public final int getTop() { 6006 return mTop; 6007 } 6008 6009 /** 6010 * Sets the top position of this view relative to its parent. This method is meant to be called 6011 * by the layout system and should not generally be called otherwise, because the property 6012 * may be changed at any time by the layout. 6013 * 6014 * @param top The top of this view, in pixels. 6015 */ 6016 public final void setTop(int top) { 6017 if (top != mTop) { 6018 updateMatrix(); 6019 if (mMatrixIsIdentity) { 6020 final ViewParent p = mParent; 6021 if (p != null && mAttachInfo != null) { 6022 final Rect r = mAttachInfo.mTmpInvalRect; 6023 int minTop; 6024 int yLoc; 6025 if (top < mTop) { 6026 minTop = top; 6027 yLoc = top - mTop; 6028 } else { 6029 minTop = mTop; 6030 yLoc = 0; 6031 } 6032 r.set(0, yLoc, mRight - mLeft, mBottom - minTop); 6033 p.invalidateChild(this, r); 6034 } 6035 } else { 6036 // Double-invalidation is necessary to capture view's old and new areas 6037 invalidate(); 6038 } 6039 6040 int width = mRight - mLeft; 6041 int oldHeight = mBottom - mTop; 6042 6043 mTop = top; 6044 6045 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6046 6047 if (!mMatrixIsIdentity) { 6048 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6049 // A change in dimension means an auto-centered pivot point changes, too 6050 mMatrixDirty = true; 6051 } 6052 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6053 invalidate(); 6054 } 6055 mBackgroundSizeChanged = true; 6056 } 6057 } 6058 6059 /** 6060 * Bottom position of this view relative to its parent. 6061 * 6062 * @return The bottom of this view, in pixels. 6063 */ 6064 @ViewDebug.CapturedViewProperty 6065 public final int getBottom() { 6066 return mBottom; 6067 } 6068 6069 /** 6070 * True if this view has changed since the last time being drawn. 6071 * 6072 * @return The dirty state of this view. 6073 */ 6074 public boolean isDirty() { 6075 return (mPrivateFlags & DIRTY_MASK) != 0; 6076 } 6077 6078 /** 6079 * Sets the bottom position of this view relative to its parent. This method is meant to be 6080 * called by the layout system and should not generally be called otherwise, because the 6081 * property may be changed at any time by the layout. 6082 * 6083 * @param bottom The bottom of this view, in pixels. 6084 */ 6085 public final void setBottom(int bottom) { 6086 if (bottom != mBottom) { 6087 updateMatrix(); 6088 if (mMatrixIsIdentity) { 6089 final ViewParent p = mParent; 6090 if (p != null && mAttachInfo != null) { 6091 final Rect r = mAttachInfo.mTmpInvalRect; 6092 int maxBottom; 6093 if (bottom < mBottom) { 6094 maxBottom = mBottom; 6095 } else { 6096 maxBottom = bottom; 6097 } 6098 r.set(0, 0, mRight - mLeft, maxBottom - mTop); 6099 p.invalidateChild(this, r); 6100 } 6101 } else { 6102 // Double-invalidation is necessary to capture view's old and new areas 6103 invalidate(); 6104 } 6105 6106 int width = mRight - mLeft; 6107 int oldHeight = mBottom - mTop; 6108 6109 mBottom = bottom; 6110 6111 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6112 6113 if (!mMatrixIsIdentity) { 6114 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6115 // A change in dimension means an auto-centered pivot point changes, too 6116 mMatrixDirty = true; 6117 } 6118 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6119 invalidate(); 6120 } 6121 mBackgroundSizeChanged = true; 6122 } 6123 } 6124 6125 /** 6126 * Left position of this view relative to its parent. 6127 * 6128 * @return The left edge of this view, in pixels. 6129 */ 6130 @ViewDebug.CapturedViewProperty 6131 public final int getLeft() { 6132 return mLeft; 6133 } 6134 6135 /** 6136 * Sets the left position of this view relative to its parent. This method is meant to be called 6137 * by the layout system and should not generally be called otherwise, because the property 6138 * may be changed at any time by the layout. 6139 * 6140 * @param left The bottom of this view, in pixels. 6141 */ 6142 public final void setLeft(int left) { 6143 if (left != mLeft) { 6144 updateMatrix(); 6145 if (mMatrixIsIdentity) { 6146 final ViewParent p = mParent; 6147 if (p != null && mAttachInfo != null) { 6148 final Rect r = mAttachInfo.mTmpInvalRect; 6149 int minLeft; 6150 int xLoc; 6151 if (left < mLeft) { 6152 minLeft = left; 6153 xLoc = left - mLeft; 6154 } else { 6155 minLeft = mLeft; 6156 xLoc = 0; 6157 } 6158 r.set(xLoc, 0, mRight - minLeft, mBottom - mTop); 6159 p.invalidateChild(this, r); 6160 } 6161 } else { 6162 // Double-invalidation is necessary to capture view's old and new areas 6163 invalidate(); 6164 } 6165 6166 int oldWidth = mRight - mLeft; 6167 int height = mBottom - mTop; 6168 6169 mLeft = left; 6170 6171 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6172 6173 if (!mMatrixIsIdentity) { 6174 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6175 // A change in dimension means an auto-centered pivot point changes, too 6176 mMatrixDirty = true; 6177 } 6178 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6179 invalidate(); 6180 } 6181 mBackgroundSizeChanged = true; 6182 } 6183 } 6184 6185 /** 6186 * Right position of this view relative to its parent. 6187 * 6188 * @return The right edge of this view, in pixels. 6189 */ 6190 @ViewDebug.CapturedViewProperty 6191 public final int getRight() { 6192 return mRight; 6193 } 6194 6195 /** 6196 * Sets the right position of this view relative to its parent. This method is meant to be called 6197 * by the layout system and should not generally be called otherwise, because the property 6198 * may be changed at any time by the layout. 6199 * 6200 * @param right The bottom of this view, in pixels. 6201 */ 6202 public final void setRight(int right) { 6203 if (right != mRight) { 6204 updateMatrix(); 6205 if (mMatrixIsIdentity) { 6206 final ViewParent p = mParent; 6207 if (p != null && mAttachInfo != null) { 6208 final Rect r = mAttachInfo.mTmpInvalRect; 6209 int maxRight; 6210 if (right < mRight) { 6211 maxRight = mRight; 6212 } else { 6213 maxRight = right; 6214 } 6215 r.set(0, 0, maxRight - mLeft, mBottom - mTop); 6216 p.invalidateChild(this, r); 6217 } 6218 } else { 6219 // Double-invalidation is necessary to capture view's old and new areas 6220 invalidate(); 6221 } 6222 6223 int oldWidth = mRight - mLeft; 6224 int height = mBottom - mTop; 6225 6226 mRight = right; 6227 6228 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6229 6230 if (!mMatrixIsIdentity) { 6231 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6232 // A change in dimension means an auto-centered pivot point changes, too 6233 mMatrixDirty = true; 6234 } 6235 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6236 invalidate(); 6237 } 6238 mBackgroundSizeChanged = true; 6239 } 6240 } 6241 6242 /** 6243 * The visual x position of this view, in pixels. This is equivalent to the 6244 * {@link #setTranslationX(float) translationX} property plus the current 6245 * {@link #getLeft() left} property. 6246 * 6247 * @return The visual x position of this view, in pixels. 6248 */ 6249 public float getX() { 6250 return mLeft + mTranslationX; 6251 } 6252 6253 /** 6254 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 6255 * {@link #setTranslationX(float) translationX} property to be the difference between 6256 * the x value passed in and the current {@link #getLeft() left} property. 6257 * 6258 * @param x The visual x position of this view, in pixels. 6259 */ 6260 public void setX(float x) { 6261 setTranslationX(x - mLeft); 6262 } 6263 6264 /** 6265 * The visual y position of this view, in pixels. This is equivalent to the 6266 * {@link #setTranslationY(float) translationY} property plus the current 6267 * {@link #getTop() top} property. 6268 * 6269 * @return The visual y position of this view, in pixels. 6270 */ 6271 public float getY() { 6272 return mTop + mTranslationY; 6273 } 6274 6275 /** 6276 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 6277 * {@link #setTranslationY(float) translationY} property to be the difference between 6278 * the y value passed in and the current {@link #getTop() top} property. 6279 * 6280 * @param y The visual y position of this view, in pixels. 6281 */ 6282 public void setY(float y) { 6283 setTranslationY(y - mTop); 6284 } 6285 6286 6287 /** 6288 * The horizontal location of this view relative to its {@link #getLeft() left} position. 6289 * This position is post-layout, in addition to wherever the object's 6290 * layout placed it. 6291 * 6292 * @return The horizontal position of this view relative to its left position, in pixels. 6293 */ 6294 public float getTranslationX() { 6295 return mTranslationX; 6296 } 6297 6298 /** 6299 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 6300 * This effectively positions the object post-layout, in addition to wherever the object's 6301 * layout placed it. 6302 * 6303 * @param translationX The horizontal position of this view relative to its left position, 6304 * in pixels. 6305 * 6306 * @attr ref android.R.styleable#View_translationX 6307 */ 6308 public void setTranslationX(float translationX) { 6309 if (mTranslationX != translationX) { 6310 // Double-invalidation is necessary to capture view's old and new areas 6311 invalidate(false); 6312 mTranslationX = translationX; 6313 mMatrixDirty = true; 6314 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6315 invalidate(false); 6316 invalidateParentIfAccelerated(); 6317 } 6318 } 6319 6320 /** 6321 * The horizontal location of this view relative to its {@link #getTop() top} position. 6322 * This position is post-layout, in addition to wherever the object's 6323 * layout placed it. 6324 * 6325 * @return The vertical position of this view relative to its top position, 6326 * in pixels. 6327 */ 6328 public float getTranslationY() { 6329 return mTranslationY; 6330 } 6331 6332 /** 6333 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 6334 * This effectively positions the object post-layout, in addition to wherever the object's 6335 * layout placed it. 6336 * 6337 * @param translationY The vertical position of this view relative to its top position, 6338 * in pixels. 6339 * 6340 * @attr ref android.R.styleable#View_translationY 6341 */ 6342 public void setTranslationY(float translationY) { 6343 if (mTranslationY != translationY) { 6344 // Double-invalidation is necessary to capture view's old and new areas 6345 invalidate(false); 6346 mTranslationY = translationY; 6347 mMatrixDirty = true; 6348 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6349 invalidate(false); 6350 invalidateParentIfAccelerated(); 6351 } 6352 } 6353 6354 /** 6355 * Hit rectangle in parent's coordinates 6356 * 6357 * @param outRect The hit rectangle of the view. 6358 */ 6359 public void getHitRect(Rect outRect) { 6360 updateMatrix(); 6361 if (mMatrixIsIdentity || mAttachInfo == null) { 6362 outRect.set(mLeft, mTop, mRight, mBottom); 6363 } else { 6364 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 6365 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 6366 mMatrix.mapRect(tmpRect); 6367 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 6368 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 6369 } 6370 } 6371 6372 /** 6373 * Determines whether the given point, in local coordinates is inside the view. 6374 */ 6375 /*package*/ final boolean pointInView(float localX, float localY) { 6376 return localX >= 0 && localX < (mRight - mLeft) 6377 && localY >= 0 && localY < (mBottom - mTop); 6378 } 6379 6380 /** 6381 * Utility method to determine whether the given point, in local coordinates, 6382 * is inside the view, where the area of the view is expanded by the slop factor. 6383 * This method is called while processing touch-move events to determine if the event 6384 * is still within the view. 6385 */ 6386 private boolean pointInView(float localX, float localY, float slop) { 6387 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 6388 localY < ((mBottom - mTop) + slop); 6389 } 6390 6391 /** 6392 * When a view has focus and the user navigates away from it, the next view is searched for 6393 * starting from the rectangle filled in by this method. 6394 * 6395 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 6396 * view maintains some idea of internal selection, such as a cursor, or a selected row 6397 * or column, you should override this method and fill in a more specific rectangle. 6398 * 6399 * @param r The rectangle to fill in, in this view's coordinates. 6400 */ 6401 public void getFocusedRect(Rect r) { 6402 getDrawingRect(r); 6403 } 6404 6405 /** 6406 * If some part of this view is not clipped by any of its parents, then 6407 * return that area in r in global (root) coordinates. To convert r to local 6408 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 6409 * -globalOffset.y)) If the view is completely clipped or translated out, 6410 * return false. 6411 * 6412 * @param r If true is returned, r holds the global coordinates of the 6413 * visible portion of this view. 6414 * @param globalOffset If true is returned, globalOffset holds the dx,dy 6415 * between this view and its root. globalOffet may be null. 6416 * @return true if r is non-empty (i.e. part of the view is visible at the 6417 * root level. 6418 */ 6419 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 6420 int width = mRight - mLeft; 6421 int height = mBottom - mTop; 6422 if (width > 0 && height > 0) { 6423 r.set(0, 0, width, height); 6424 if (globalOffset != null) { 6425 globalOffset.set(-mScrollX, -mScrollY); 6426 } 6427 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 6428 } 6429 return false; 6430 } 6431 6432 public final boolean getGlobalVisibleRect(Rect r) { 6433 return getGlobalVisibleRect(r, null); 6434 } 6435 6436 public final boolean getLocalVisibleRect(Rect r) { 6437 Point offset = new Point(); 6438 if (getGlobalVisibleRect(r, offset)) { 6439 r.offset(-offset.x, -offset.y); // make r local 6440 return true; 6441 } 6442 return false; 6443 } 6444 6445 /** 6446 * Offset this view's vertical location by the specified number of pixels. 6447 * 6448 * @param offset the number of pixels to offset the view by 6449 */ 6450 public void offsetTopAndBottom(int offset) { 6451 if (offset != 0) { 6452 updateMatrix(); 6453 if (mMatrixIsIdentity) { 6454 final ViewParent p = mParent; 6455 if (p != null && mAttachInfo != null) { 6456 final Rect r = mAttachInfo.mTmpInvalRect; 6457 int minTop; 6458 int maxBottom; 6459 int yLoc; 6460 if (offset < 0) { 6461 minTop = mTop + offset; 6462 maxBottom = mBottom; 6463 yLoc = offset; 6464 } else { 6465 minTop = mTop; 6466 maxBottom = mBottom + offset; 6467 yLoc = 0; 6468 } 6469 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 6470 p.invalidateChild(this, r); 6471 } 6472 } else { 6473 invalidate(false); 6474 } 6475 6476 mTop += offset; 6477 mBottom += offset; 6478 6479 if (!mMatrixIsIdentity) { 6480 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6481 invalidate(false); 6482 } 6483 } 6484 } 6485 6486 /** 6487 * Offset this view's horizontal location by the specified amount of pixels. 6488 * 6489 * @param offset the numer of pixels to offset the view by 6490 */ 6491 public void offsetLeftAndRight(int offset) { 6492 if (offset != 0) { 6493 updateMatrix(); 6494 if (mMatrixIsIdentity) { 6495 final ViewParent p = mParent; 6496 if (p != null && mAttachInfo != null) { 6497 final Rect r = mAttachInfo.mTmpInvalRect; 6498 int minLeft; 6499 int maxRight; 6500 if (offset < 0) { 6501 minLeft = mLeft + offset; 6502 maxRight = mRight; 6503 } else { 6504 minLeft = mLeft; 6505 maxRight = mRight + offset; 6506 } 6507 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 6508 p.invalidateChild(this, r); 6509 } 6510 } else { 6511 invalidate(false); 6512 } 6513 6514 mLeft += offset; 6515 mRight += offset; 6516 6517 if (!mMatrixIsIdentity) { 6518 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6519 invalidate(false); 6520 } 6521 } 6522 } 6523 6524 /** 6525 * Get the LayoutParams associated with this view. All views should have 6526 * layout parameters. These supply parameters to the <i>parent</i> of this 6527 * view specifying how it should be arranged. There are many subclasses of 6528 * ViewGroup.LayoutParams, and these correspond to the different subclasses 6529 * of ViewGroup that are responsible for arranging their children. 6530 * @return The LayoutParams associated with this view 6531 */ 6532 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 6533 public ViewGroup.LayoutParams getLayoutParams() { 6534 return mLayoutParams; 6535 } 6536 6537 /** 6538 * Set the layout parameters associated with this view. These supply 6539 * parameters to the <i>parent</i> of this view specifying how it should be 6540 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 6541 * correspond to the different subclasses of ViewGroup that are responsible 6542 * for arranging their children. 6543 * 6544 * @param params the layout parameters for this view 6545 */ 6546 public void setLayoutParams(ViewGroup.LayoutParams params) { 6547 if (params == null) { 6548 throw new NullPointerException("params == null"); 6549 } 6550 mLayoutParams = params; 6551 requestLayout(); 6552 } 6553 6554 /** 6555 * Set the scrolled position of your view. This will cause a call to 6556 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6557 * invalidated. 6558 * @param x the x position to scroll to 6559 * @param y the y position to scroll to 6560 */ 6561 public void scrollTo(int x, int y) { 6562 if (mScrollX != x || mScrollY != y) { 6563 int oldX = mScrollX; 6564 int oldY = mScrollY; 6565 mScrollX = x; 6566 mScrollY = y; 6567 invalidateParentIfAccelerated(); 6568 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 6569 if (!awakenScrollBars()) { 6570 invalidate(); 6571 } 6572 } 6573 } 6574 6575 /** 6576 * Move the scrolled position of your view. This will cause a call to 6577 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6578 * invalidated. 6579 * @param x the amount of pixels to scroll by horizontally 6580 * @param y the amount of pixels to scroll by vertically 6581 */ 6582 public void scrollBy(int x, int y) { 6583 scrollTo(mScrollX + x, mScrollY + y); 6584 } 6585 6586 /** 6587 * <p>Trigger the scrollbars to draw. When invoked this method starts an 6588 * animation to fade the scrollbars out after a default delay. If a subclass 6589 * provides animated scrolling, the start delay should equal the duration 6590 * of the scrolling animation.</p> 6591 * 6592 * <p>The animation starts only if at least one of the scrollbars is 6593 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 6594 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6595 * this method returns true, and false otherwise. If the animation is 6596 * started, this method calls {@link #invalidate()}; in that case the 6597 * caller should not call {@link #invalidate()}.</p> 6598 * 6599 * <p>This method should be invoked every time a subclass directly updates 6600 * the scroll parameters.</p> 6601 * 6602 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6603 * and {@link #scrollTo(int, int)}.</p> 6604 * 6605 * @return true if the animation is played, false otherwise 6606 * 6607 * @see #awakenScrollBars(int) 6608 * @see #scrollBy(int, int) 6609 * @see #scrollTo(int, int) 6610 * @see #isHorizontalScrollBarEnabled() 6611 * @see #isVerticalScrollBarEnabled() 6612 * @see #setHorizontalScrollBarEnabled(boolean) 6613 * @see #setVerticalScrollBarEnabled(boolean) 6614 */ 6615 protected boolean awakenScrollBars() { 6616 return mScrollCache != null && 6617 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6618 } 6619 6620 /** 6621 * Trigger the scrollbars to draw. 6622 * This method differs from awakenScrollBars() only in its default duration. 6623 * initialAwakenScrollBars() will show the scroll bars for longer than 6624 * usual to give the user more of a chance to notice them. 6625 * 6626 * @return true if the animation is played, false otherwise. 6627 */ 6628 private boolean initialAwakenScrollBars() { 6629 return mScrollCache != null && 6630 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6631 } 6632 6633 /** 6634 * <p> 6635 * Trigger the scrollbars to draw. When invoked this method starts an 6636 * animation to fade the scrollbars out after a fixed delay. If a subclass 6637 * provides animated scrolling, the start delay should equal the duration of 6638 * the scrolling animation. 6639 * </p> 6640 * 6641 * <p> 6642 * The animation starts only if at least one of the scrollbars is enabled, 6643 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6644 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6645 * this method returns true, and false otherwise. If the animation is 6646 * started, this method calls {@link #invalidate()}; in that case the caller 6647 * should not call {@link #invalidate()}. 6648 * </p> 6649 * 6650 * <p> 6651 * This method should be invoked everytime a subclass directly updates the 6652 * scroll parameters. 6653 * </p> 6654 * 6655 * @param startDelay the delay, in milliseconds, after which the animation 6656 * should start; when the delay is 0, the animation starts 6657 * immediately 6658 * @return true if the animation is played, false otherwise 6659 * 6660 * @see #scrollBy(int, int) 6661 * @see #scrollTo(int, int) 6662 * @see #isHorizontalScrollBarEnabled() 6663 * @see #isVerticalScrollBarEnabled() 6664 * @see #setHorizontalScrollBarEnabled(boolean) 6665 * @see #setVerticalScrollBarEnabled(boolean) 6666 */ 6667 protected boolean awakenScrollBars(int startDelay) { 6668 return awakenScrollBars(startDelay, true); 6669 } 6670 6671 /** 6672 * <p> 6673 * Trigger the scrollbars to draw. When invoked this method starts an 6674 * animation to fade the scrollbars out after a fixed delay. If a subclass 6675 * provides animated scrolling, the start delay should equal the duration of 6676 * the scrolling animation. 6677 * </p> 6678 * 6679 * <p> 6680 * The animation starts only if at least one of the scrollbars is enabled, 6681 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6682 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6683 * this method returns true, and false otherwise. If the animation is 6684 * started, this method calls {@link #invalidate()} if the invalidate parameter 6685 * is set to true; in that case the caller 6686 * should not call {@link #invalidate()}. 6687 * </p> 6688 * 6689 * <p> 6690 * This method should be invoked everytime a subclass directly updates the 6691 * scroll parameters. 6692 * </p> 6693 * 6694 * @param startDelay the delay, in milliseconds, after which the animation 6695 * should start; when the delay is 0, the animation starts 6696 * immediately 6697 * 6698 * @param invalidate Wheter this method should call invalidate 6699 * 6700 * @return true if the animation is played, false otherwise 6701 * 6702 * @see #scrollBy(int, int) 6703 * @see #scrollTo(int, int) 6704 * @see #isHorizontalScrollBarEnabled() 6705 * @see #isVerticalScrollBarEnabled() 6706 * @see #setHorizontalScrollBarEnabled(boolean) 6707 * @see #setVerticalScrollBarEnabled(boolean) 6708 */ 6709 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 6710 final ScrollabilityCache scrollCache = mScrollCache; 6711 6712 if (scrollCache == null || !scrollCache.fadeScrollBars) { 6713 return false; 6714 } 6715 6716 if (scrollCache.scrollBar == null) { 6717 scrollCache.scrollBar = new ScrollBarDrawable(); 6718 } 6719 6720 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 6721 6722 if (invalidate) { 6723 // Invalidate to show the scrollbars 6724 invalidate(); 6725 } 6726 6727 if (scrollCache.state == ScrollabilityCache.OFF) { 6728 // FIXME: this is copied from WindowManagerService. 6729 // We should get this value from the system when it 6730 // is possible to do so. 6731 final int KEY_REPEAT_FIRST_DELAY = 750; 6732 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 6733 } 6734 6735 // Tell mScrollCache when we should start fading. This may 6736 // extend the fade start time if one was already scheduled 6737 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 6738 scrollCache.fadeStartTime = fadeStartTime; 6739 scrollCache.state = ScrollabilityCache.ON; 6740 6741 // Schedule our fader to run, unscheduling any old ones first 6742 if (mAttachInfo != null) { 6743 mAttachInfo.mHandler.removeCallbacks(scrollCache); 6744 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 6745 } 6746 6747 return true; 6748 } 6749 6750 return false; 6751 } 6752 6753 /** 6754 * Mark the the area defined by dirty as needing to be drawn. If the view is 6755 * visible, {@link #onDraw} will be called at some point in the future. 6756 * This must be called from a UI thread. To call from a non-UI thread, call 6757 * {@link #postInvalidate()}. 6758 * 6759 * WARNING: This method is destructive to dirty. 6760 * @param dirty the rectangle representing the bounds of the dirty region 6761 */ 6762 public void invalidate(Rect dirty) { 6763 if (ViewDebug.TRACE_HIERARCHY) { 6764 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6765 } 6766 6767 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6768 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 6769 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 6770 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6771 mPrivateFlags |= INVALIDATED; 6772 final ViewParent p = mParent; 6773 final AttachInfo ai = mAttachInfo; 6774 //noinspection PointlessBooleanExpression,ConstantConditions 6775 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 6776 if (p != null && ai != null && ai.mHardwareAccelerated) { 6777 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6778 // with a null dirty rect, which tells the ViewRoot to redraw everything 6779 p.invalidateChild(this, null); 6780 return; 6781 } 6782 } 6783 if (p != null && ai != null) { 6784 final int scrollX = mScrollX; 6785 final int scrollY = mScrollY; 6786 final Rect r = ai.mTmpInvalRect; 6787 r.set(dirty.left - scrollX, dirty.top - scrollY, 6788 dirty.right - scrollX, dirty.bottom - scrollY); 6789 mParent.invalidateChild(this, r); 6790 } 6791 } 6792 } 6793 6794 /** 6795 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 6796 * The coordinates of the dirty rect are relative to the view. 6797 * If the view is visible, {@link #onDraw} will be called at some point 6798 * in the future. This must be called from a UI thread. To call 6799 * from a non-UI thread, call {@link #postInvalidate()}. 6800 * @param l the left position of the dirty region 6801 * @param t the top position of the dirty region 6802 * @param r the right position of the dirty region 6803 * @param b the bottom position of the dirty region 6804 */ 6805 public void invalidate(int l, int t, int r, int b) { 6806 if (ViewDebug.TRACE_HIERARCHY) { 6807 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6808 } 6809 6810 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6811 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 6812 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 6813 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6814 mPrivateFlags |= INVALIDATED; 6815 final ViewParent p = mParent; 6816 final AttachInfo ai = mAttachInfo; 6817 //noinspection PointlessBooleanExpression,ConstantConditions 6818 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 6819 if (p != null && ai != null && ai.mHardwareAccelerated) { 6820 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6821 // with a null dirty rect, which tells the ViewRoot to redraw everything 6822 p.invalidateChild(this, null); 6823 return; 6824 } 6825 } 6826 if (p != null && ai != null && l < r && t < b) { 6827 final int scrollX = mScrollX; 6828 final int scrollY = mScrollY; 6829 final Rect tmpr = ai.mTmpInvalRect; 6830 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 6831 p.invalidateChild(this, tmpr); 6832 } 6833 } 6834 } 6835 6836 /** 6837 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 6838 * be called at some point in the future. This must be called from a 6839 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 6840 */ 6841 public void invalidate() { 6842 invalidate(true); 6843 } 6844 6845 /** 6846 * This is where the invalidate() work actually happens. A full invalidate() 6847 * causes the drawing cache to be invalidated, but this function can be called with 6848 * invalidateCache set to false to skip that invalidation step for cases that do not 6849 * need it (for example, a component that remains at the same dimensions with the same 6850 * content). 6851 * 6852 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 6853 * well. This is usually true for a full invalidate, but may be set to false if the 6854 * View's contents or dimensions have not changed. 6855 */ 6856 private void invalidate(boolean invalidateCache) { 6857 if (ViewDebug.TRACE_HIERARCHY) { 6858 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6859 } 6860 6861 boolean opaque = isOpaque(); 6862 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6863 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 6864 opaque != mLastIsOpaque || (mPrivateFlags & INVALIDATED) != INVALIDATED) { 6865 mLastIsOpaque = opaque; 6866 mPrivateFlags &= ~DRAWN; 6867 if (invalidateCache) { 6868 mPrivateFlags |= INVALIDATED; 6869 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6870 } 6871 final AttachInfo ai = mAttachInfo; 6872 final ViewParent p = mParent; 6873 //noinspection PointlessBooleanExpression,ConstantConditions 6874 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 6875 if (p != null && ai != null && ai.mHardwareAccelerated) { 6876 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6877 // with a null dirty rect, which tells the ViewRoot to redraw everything 6878 p.invalidateChild(this, null); 6879 return; 6880 } 6881 } 6882 6883 if (p != null && ai != null) { 6884 final Rect r = ai.mTmpInvalRect; 6885 r.set(0, 0, mRight - mLeft, mBottom - mTop); 6886 // Don't call invalidate -- we don't want to internally scroll 6887 // our own bounds 6888 p.invalidateChild(this, r); 6889 } 6890 } 6891 } 6892 6893 /** 6894 * Used to indicate that the parent of this view should be invalidated. This functionality 6895 * is used to force the parent to rebuild its display list (when hardware-accelerated), 6896 * which is necessary when various parent-managed properties of the view change, such as 6897 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. 6898 * 6899 * @hide 6900 */ 6901 protected void invalidateParentIfAccelerated() { 6902 if (isHardwareAccelerated() && mParent instanceof View) { 6903 ((View) mParent).invalidate(); 6904 } 6905 } 6906 6907 /** 6908 * Indicates whether this View is opaque. An opaque View guarantees that it will 6909 * draw all the pixels overlapping its bounds using a fully opaque color. 6910 * 6911 * Subclasses of View should override this method whenever possible to indicate 6912 * whether an instance is opaque. Opaque Views are treated in a special way by 6913 * the View hierarchy, possibly allowing it to perform optimizations during 6914 * invalidate/draw passes. 6915 * 6916 * @return True if this View is guaranteed to be fully opaque, false otherwise. 6917 */ 6918 @ViewDebug.ExportedProperty(category = "drawing") 6919 public boolean isOpaque() { 6920 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 6921 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 6922 } 6923 6924 /** 6925 * @hide 6926 */ 6927 protected void computeOpaqueFlags() { 6928 // Opaque if: 6929 // - Has a background 6930 // - Background is opaque 6931 // - Doesn't have scrollbars or scrollbars are inside overlay 6932 6933 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 6934 mPrivateFlags |= OPAQUE_BACKGROUND; 6935 } else { 6936 mPrivateFlags &= ~OPAQUE_BACKGROUND; 6937 } 6938 6939 final int flags = mViewFlags; 6940 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 6941 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 6942 mPrivateFlags |= OPAQUE_SCROLLBARS; 6943 } else { 6944 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 6945 } 6946 } 6947 6948 /** 6949 * @hide 6950 */ 6951 protected boolean hasOpaqueScrollbars() { 6952 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 6953 } 6954 6955 /** 6956 * @return A handler associated with the thread running the View. This 6957 * handler can be used to pump events in the UI events queue. 6958 */ 6959 public Handler getHandler() { 6960 if (mAttachInfo != null) { 6961 return mAttachInfo.mHandler; 6962 } 6963 return null; 6964 } 6965 6966 /** 6967 * Causes the Runnable to be added to the message queue. 6968 * The runnable will be run on the user interface thread. 6969 * 6970 * @param action The Runnable that will be executed. 6971 * 6972 * @return Returns true if the Runnable was successfully placed in to the 6973 * message queue. Returns false on failure, usually because the 6974 * looper processing the message queue is exiting. 6975 */ 6976 public boolean post(Runnable action) { 6977 Handler handler; 6978 if (mAttachInfo != null) { 6979 handler = mAttachInfo.mHandler; 6980 } else { 6981 // Assume that post will succeed later 6982 ViewRoot.getRunQueue().post(action); 6983 return true; 6984 } 6985 6986 return handler.post(action); 6987 } 6988 6989 /** 6990 * Causes the Runnable to be added to the message queue, to be run 6991 * after the specified amount of time elapses. 6992 * The runnable will be run on the user interface thread. 6993 * 6994 * @param action The Runnable that will be executed. 6995 * @param delayMillis The delay (in milliseconds) until the Runnable 6996 * will be executed. 6997 * 6998 * @return true if the Runnable was successfully placed in to the 6999 * message queue. Returns false on failure, usually because the 7000 * looper processing the message queue is exiting. Note that a 7001 * result of true does not mean the Runnable will be processed -- 7002 * if the looper is quit before the delivery time of the message 7003 * occurs then the message will be dropped. 7004 */ 7005 public boolean postDelayed(Runnable action, long delayMillis) { 7006 Handler handler; 7007 if (mAttachInfo != null) { 7008 handler = mAttachInfo.mHandler; 7009 } else { 7010 // Assume that post will succeed later 7011 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 7012 return true; 7013 } 7014 7015 return handler.postDelayed(action, delayMillis); 7016 } 7017 7018 /** 7019 * Removes the specified Runnable from the message queue. 7020 * 7021 * @param action The Runnable to remove from the message handling queue 7022 * 7023 * @return true if this view could ask the Handler to remove the Runnable, 7024 * false otherwise. When the returned value is true, the Runnable 7025 * may or may not have been actually removed from the message queue 7026 * (for instance, if the Runnable was not in the queue already.) 7027 */ 7028 public boolean removeCallbacks(Runnable action) { 7029 Handler handler; 7030 if (mAttachInfo != null) { 7031 handler = mAttachInfo.mHandler; 7032 } else { 7033 // Assume that post will succeed later 7034 ViewRoot.getRunQueue().removeCallbacks(action); 7035 return true; 7036 } 7037 7038 handler.removeCallbacks(action); 7039 return true; 7040 } 7041 7042 /** 7043 * Cause an invalidate to happen on a subsequent cycle through the event loop. 7044 * Use this to invalidate the View from a non-UI thread. 7045 * 7046 * @see #invalidate() 7047 */ 7048 public void postInvalidate() { 7049 postInvalidateDelayed(0); 7050 } 7051 7052 /** 7053 * Cause an invalidate of the specified area to happen on a subsequent cycle 7054 * through the event loop. Use this to invalidate the View from a non-UI thread. 7055 * 7056 * @param left The left coordinate of the rectangle to invalidate. 7057 * @param top The top coordinate of the rectangle to invalidate. 7058 * @param right The right coordinate of the rectangle to invalidate. 7059 * @param bottom The bottom coordinate of the rectangle to invalidate. 7060 * 7061 * @see #invalidate(int, int, int, int) 7062 * @see #invalidate(Rect) 7063 */ 7064 public void postInvalidate(int left, int top, int right, int bottom) { 7065 postInvalidateDelayed(0, left, top, right, bottom); 7066 } 7067 7068 /** 7069 * Cause an invalidate to happen on a subsequent cycle through the event 7070 * loop. Waits for the specified amount of time. 7071 * 7072 * @param delayMilliseconds the duration in milliseconds to delay the 7073 * invalidation by 7074 */ 7075 public void postInvalidateDelayed(long delayMilliseconds) { 7076 // We try only with the AttachInfo because there's no point in invalidating 7077 // if we are not attached to our window 7078 if (mAttachInfo != null) { 7079 Message msg = Message.obtain(); 7080 msg.what = AttachInfo.INVALIDATE_MSG; 7081 msg.obj = this; 7082 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 7083 } 7084 } 7085 7086 /** 7087 * Cause an invalidate of the specified area to happen on a subsequent cycle 7088 * through the event loop. Waits for the specified amount of time. 7089 * 7090 * @param delayMilliseconds the duration in milliseconds to delay the 7091 * invalidation by 7092 * @param left The left coordinate of the rectangle to invalidate. 7093 * @param top The top coordinate of the rectangle to invalidate. 7094 * @param right The right coordinate of the rectangle to invalidate. 7095 * @param bottom The bottom coordinate of the rectangle to invalidate. 7096 */ 7097 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 7098 int right, int bottom) { 7099 7100 // We try only with the AttachInfo because there's no point in invalidating 7101 // if we are not attached to our window 7102 if (mAttachInfo != null) { 7103 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 7104 info.target = this; 7105 info.left = left; 7106 info.top = top; 7107 info.right = right; 7108 info.bottom = bottom; 7109 7110 final Message msg = Message.obtain(); 7111 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 7112 msg.obj = info; 7113 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 7114 } 7115 } 7116 7117 /** 7118 * Called by a parent to request that a child update its values for mScrollX 7119 * and mScrollY if necessary. This will typically be done if the child is 7120 * animating a scroll using a {@link android.widget.Scroller Scroller} 7121 * object. 7122 */ 7123 public void computeScroll() { 7124 } 7125 7126 /** 7127 * <p>Indicate whether the horizontal edges are faded when the view is 7128 * scrolled horizontally.</p> 7129 * 7130 * @return true if the horizontal edges should are faded on scroll, false 7131 * otherwise 7132 * 7133 * @see #setHorizontalFadingEdgeEnabled(boolean) 7134 * @attr ref android.R.styleable#View_fadingEdge 7135 */ 7136 public boolean isHorizontalFadingEdgeEnabled() { 7137 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 7138 } 7139 7140 /** 7141 * <p>Define whether the horizontal edges should be faded when this view 7142 * is scrolled horizontally.</p> 7143 * 7144 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 7145 * be faded when the view is scrolled 7146 * horizontally 7147 * 7148 * @see #isHorizontalFadingEdgeEnabled() 7149 * @attr ref android.R.styleable#View_fadingEdge 7150 */ 7151 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 7152 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 7153 if (horizontalFadingEdgeEnabled) { 7154 initScrollCache(); 7155 } 7156 7157 mViewFlags ^= FADING_EDGE_HORIZONTAL; 7158 } 7159 } 7160 7161 /** 7162 * <p>Indicate whether the vertical edges are faded when the view is 7163 * scrolled horizontally.</p> 7164 * 7165 * @return true if the vertical edges should are faded on scroll, false 7166 * otherwise 7167 * 7168 * @see #setVerticalFadingEdgeEnabled(boolean) 7169 * @attr ref android.R.styleable#View_fadingEdge 7170 */ 7171 public boolean isVerticalFadingEdgeEnabled() { 7172 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 7173 } 7174 7175 /** 7176 * <p>Define whether the vertical edges should be faded when this view 7177 * is scrolled vertically.</p> 7178 * 7179 * @param verticalFadingEdgeEnabled true if the vertical edges should 7180 * be faded when the view is scrolled 7181 * vertically 7182 * 7183 * @see #isVerticalFadingEdgeEnabled() 7184 * @attr ref android.R.styleable#View_fadingEdge 7185 */ 7186 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 7187 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 7188 if (verticalFadingEdgeEnabled) { 7189 initScrollCache(); 7190 } 7191 7192 mViewFlags ^= FADING_EDGE_VERTICAL; 7193 } 7194 } 7195 7196 /** 7197 * Returns the strength, or intensity, of the top faded edge. The strength is 7198 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7199 * returns 0.0 or 1.0 but no value in between. 7200 * 7201 * Subclasses should override this method to provide a smoother fade transition 7202 * when scrolling occurs. 7203 * 7204 * @return the intensity of the top fade as a float between 0.0f and 1.0f 7205 */ 7206 protected float getTopFadingEdgeStrength() { 7207 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 7208 } 7209 7210 /** 7211 * Returns the strength, or intensity, of the bottom faded edge. The strength is 7212 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7213 * returns 0.0 or 1.0 but no value in between. 7214 * 7215 * Subclasses should override this method to provide a smoother fade transition 7216 * when scrolling occurs. 7217 * 7218 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 7219 */ 7220 protected float getBottomFadingEdgeStrength() { 7221 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 7222 computeVerticalScrollRange() ? 1.0f : 0.0f; 7223 } 7224 7225 /** 7226 * Returns the strength, or intensity, of the left faded edge. The strength is 7227 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7228 * returns 0.0 or 1.0 but no value in between. 7229 * 7230 * Subclasses should override this method to provide a smoother fade transition 7231 * when scrolling occurs. 7232 * 7233 * @return the intensity of the left fade as a float between 0.0f and 1.0f 7234 */ 7235 protected float getLeftFadingEdgeStrength() { 7236 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 7237 } 7238 7239 /** 7240 * Returns the strength, or intensity, of the right faded edge. The strength is 7241 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7242 * returns 0.0 or 1.0 but no value in between. 7243 * 7244 * Subclasses should override this method to provide a smoother fade transition 7245 * when scrolling occurs. 7246 * 7247 * @return the intensity of the right fade as a float between 0.0f and 1.0f 7248 */ 7249 protected float getRightFadingEdgeStrength() { 7250 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 7251 computeHorizontalScrollRange() ? 1.0f : 0.0f; 7252 } 7253 7254 /** 7255 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 7256 * scrollbar is not drawn by default.</p> 7257 * 7258 * @return true if the horizontal scrollbar should be painted, false 7259 * otherwise 7260 * 7261 * @see #setHorizontalScrollBarEnabled(boolean) 7262 */ 7263 public boolean isHorizontalScrollBarEnabled() { 7264 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7265 } 7266 7267 /** 7268 * <p>Define whether the horizontal scrollbar should be drawn or not. The 7269 * scrollbar is not drawn by default.</p> 7270 * 7271 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 7272 * be painted 7273 * 7274 * @see #isHorizontalScrollBarEnabled() 7275 */ 7276 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 7277 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 7278 mViewFlags ^= SCROLLBARS_HORIZONTAL; 7279 computeOpaqueFlags(); 7280 recomputePadding(); 7281 } 7282 } 7283 7284 /** 7285 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 7286 * scrollbar is not drawn by default.</p> 7287 * 7288 * @return true if the vertical scrollbar should be painted, false 7289 * otherwise 7290 * 7291 * @see #setVerticalScrollBarEnabled(boolean) 7292 */ 7293 public boolean isVerticalScrollBarEnabled() { 7294 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 7295 } 7296 7297 /** 7298 * <p>Define whether the vertical scrollbar should be drawn or not. The 7299 * scrollbar is not drawn by default.</p> 7300 * 7301 * @param verticalScrollBarEnabled true if the vertical scrollbar should 7302 * be painted 7303 * 7304 * @see #isVerticalScrollBarEnabled() 7305 */ 7306 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 7307 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 7308 mViewFlags ^= SCROLLBARS_VERTICAL; 7309 computeOpaqueFlags(); 7310 recomputePadding(); 7311 } 7312 } 7313 7314 /** 7315 * @hide 7316 */ 7317 protected void recomputePadding() { 7318 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 7319 } 7320 7321 /** 7322 * Define whether scrollbars will fade when the view is not scrolling. 7323 * 7324 * @param fadeScrollbars wheter to enable fading 7325 * 7326 */ 7327 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 7328 initScrollCache(); 7329 final ScrollabilityCache scrollabilityCache = mScrollCache; 7330 scrollabilityCache.fadeScrollBars = fadeScrollbars; 7331 if (fadeScrollbars) { 7332 scrollabilityCache.state = ScrollabilityCache.OFF; 7333 } else { 7334 scrollabilityCache.state = ScrollabilityCache.ON; 7335 } 7336 } 7337 7338 /** 7339 * 7340 * Returns true if scrollbars will fade when this view is not scrolling 7341 * 7342 * @return true if scrollbar fading is enabled 7343 */ 7344 public boolean isScrollbarFadingEnabled() { 7345 return mScrollCache != null && mScrollCache.fadeScrollBars; 7346 } 7347 7348 /** 7349 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 7350 * inset. When inset, they add to the padding of the view. And the scrollbars 7351 * can be drawn inside the padding area or on the edge of the view. For example, 7352 * if a view has a background drawable and you want to draw the scrollbars 7353 * inside the padding specified by the drawable, you can use 7354 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 7355 * appear at the edge of the view, ignoring the padding, then you can use 7356 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 7357 * @param style the style of the scrollbars. Should be one of 7358 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 7359 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 7360 * @see #SCROLLBARS_INSIDE_OVERLAY 7361 * @see #SCROLLBARS_INSIDE_INSET 7362 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7363 * @see #SCROLLBARS_OUTSIDE_INSET 7364 */ 7365 public void setScrollBarStyle(int style) { 7366 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 7367 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 7368 computeOpaqueFlags(); 7369 recomputePadding(); 7370 } 7371 } 7372 7373 /** 7374 * <p>Returns the current scrollbar style.</p> 7375 * @return the current scrollbar style 7376 * @see #SCROLLBARS_INSIDE_OVERLAY 7377 * @see #SCROLLBARS_INSIDE_INSET 7378 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7379 * @see #SCROLLBARS_OUTSIDE_INSET 7380 */ 7381 public int getScrollBarStyle() { 7382 return mViewFlags & SCROLLBARS_STYLE_MASK; 7383 } 7384 7385 /** 7386 * <p>Compute the horizontal range that the horizontal scrollbar 7387 * represents.</p> 7388 * 7389 * <p>The range is expressed in arbitrary units that must be the same as the 7390 * units used by {@link #computeHorizontalScrollExtent()} and 7391 * {@link #computeHorizontalScrollOffset()}.</p> 7392 * 7393 * <p>The default range is the drawing width of this view.</p> 7394 * 7395 * @return the total horizontal range represented by the horizontal 7396 * scrollbar 7397 * 7398 * @see #computeHorizontalScrollExtent() 7399 * @see #computeHorizontalScrollOffset() 7400 * @see android.widget.ScrollBarDrawable 7401 */ 7402 protected int computeHorizontalScrollRange() { 7403 return getWidth(); 7404 } 7405 7406 /** 7407 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 7408 * within the horizontal range. This value is used to compute the position 7409 * of the thumb within the scrollbar's track.</p> 7410 * 7411 * <p>The range is expressed in arbitrary units that must be the same as the 7412 * units used by {@link #computeHorizontalScrollRange()} and 7413 * {@link #computeHorizontalScrollExtent()}.</p> 7414 * 7415 * <p>The default offset is the scroll offset of this view.</p> 7416 * 7417 * @return the horizontal offset of the scrollbar's thumb 7418 * 7419 * @see #computeHorizontalScrollRange() 7420 * @see #computeHorizontalScrollExtent() 7421 * @see android.widget.ScrollBarDrawable 7422 */ 7423 protected int computeHorizontalScrollOffset() { 7424 return mScrollX; 7425 } 7426 7427 /** 7428 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 7429 * within the horizontal range. This value is used to compute the length 7430 * of the thumb within the scrollbar's track.</p> 7431 * 7432 * <p>The range is expressed in arbitrary units that must be the same as the 7433 * units used by {@link #computeHorizontalScrollRange()} and 7434 * {@link #computeHorizontalScrollOffset()}.</p> 7435 * 7436 * <p>The default extent is the drawing width of this view.</p> 7437 * 7438 * @return the horizontal extent of the scrollbar's thumb 7439 * 7440 * @see #computeHorizontalScrollRange() 7441 * @see #computeHorizontalScrollOffset() 7442 * @see android.widget.ScrollBarDrawable 7443 */ 7444 protected int computeHorizontalScrollExtent() { 7445 return getWidth(); 7446 } 7447 7448 /** 7449 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 7450 * 7451 * <p>The range is expressed in arbitrary units that must be the same as the 7452 * units used by {@link #computeVerticalScrollExtent()} and 7453 * {@link #computeVerticalScrollOffset()}.</p> 7454 * 7455 * @return the total vertical range represented by the vertical scrollbar 7456 * 7457 * <p>The default range is the drawing height of this view.</p> 7458 * 7459 * @see #computeVerticalScrollExtent() 7460 * @see #computeVerticalScrollOffset() 7461 * @see android.widget.ScrollBarDrawable 7462 */ 7463 protected int computeVerticalScrollRange() { 7464 return getHeight(); 7465 } 7466 7467 /** 7468 * <p>Compute the vertical offset of the vertical scrollbar's thumb 7469 * within the horizontal range. This value is used to compute the position 7470 * of the thumb within the scrollbar's track.</p> 7471 * 7472 * <p>The range is expressed in arbitrary units that must be the same as the 7473 * units used by {@link #computeVerticalScrollRange()} and 7474 * {@link #computeVerticalScrollExtent()}.</p> 7475 * 7476 * <p>The default offset is the scroll offset of this view.</p> 7477 * 7478 * @return the vertical offset of the scrollbar's thumb 7479 * 7480 * @see #computeVerticalScrollRange() 7481 * @see #computeVerticalScrollExtent() 7482 * @see android.widget.ScrollBarDrawable 7483 */ 7484 protected int computeVerticalScrollOffset() { 7485 return mScrollY; 7486 } 7487 7488 /** 7489 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 7490 * within the vertical range. This value is used to compute the length 7491 * of the thumb within the scrollbar's track.</p> 7492 * 7493 * <p>The range is expressed in arbitrary units that must be the same as the 7494 * units used by {@link #computeVerticalScrollRange()} and 7495 * {@link #computeVerticalScrollOffset()}.</p> 7496 * 7497 * <p>The default extent is the drawing height of this view.</p> 7498 * 7499 * @return the vertical extent of the scrollbar's thumb 7500 * 7501 * @see #computeVerticalScrollRange() 7502 * @see #computeVerticalScrollOffset() 7503 * @see android.widget.ScrollBarDrawable 7504 */ 7505 protected int computeVerticalScrollExtent() { 7506 return getHeight(); 7507 } 7508 7509 /** 7510 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 7511 * scrollbars are painted only if they have been awakened first.</p> 7512 * 7513 * @param canvas the canvas on which to draw the scrollbars 7514 * 7515 * @see #awakenScrollBars(int) 7516 */ 7517 protected final void onDrawScrollBars(Canvas canvas) { 7518 // scrollbars are drawn only when the animation is running 7519 final ScrollabilityCache cache = mScrollCache; 7520 if (cache != null) { 7521 7522 int state = cache.state; 7523 7524 if (state == ScrollabilityCache.OFF) { 7525 return; 7526 } 7527 7528 boolean invalidate = false; 7529 7530 if (state == ScrollabilityCache.FADING) { 7531 // We're fading -- get our fade interpolation 7532 if (cache.interpolatorValues == null) { 7533 cache.interpolatorValues = new float[1]; 7534 } 7535 7536 float[] values = cache.interpolatorValues; 7537 7538 // Stops the animation if we're done 7539 if (cache.scrollBarInterpolator.timeToValues(values) == 7540 Interpolator.Result.FREEZE_END) { 7541 cache.state = ScrollabilityCache.OFF; 7542 } else { 7543 cache.scrollBar.setAlpha(Math.round(values[0])); 7544 } 7545 7546 // This will make the scroll bars inval themselves after 7547 // drawing. We only want this when we're fading so that 7548 // we prevent excessive redraws 7549 invalidate = true; 7550 } else { 7551 // We're just on -- but we may have been fading before so 7552 // reset alpha 7553 cache.scrollBar.setAlpha(255); 7554 } 7555 7556 7557 final int viewFlags = mViewFlags; 7558 7559 final boolean drawHorizontalScrollBar = 7560 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7561 final boolean drawVerticalScrollBar = 7562 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 7563 && !isVerticalScrollBarHidden(); 7564 7565 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 7566 final int width = mRight - mLeft; 7567 final int height = mBottom - mTop; 7568 7569 final ScrollBarDrawable scrollBar = cache.scrollBar; 7570 int size = scrollBar.getSize(false); 7571 if (size <= 0) { 7572 size = cache.scrollBarSize; 7573 } 7574 7575 final int scrollX = mScrollX; 7576 final int scrollY = mScrollY; 7577 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 7578 7579 int left, top, right, bottom; 7580 7581 if (drawHorizontalScrollBar) { 7582 scrollBar.setParameters(computeHorizontalScrollRange(), 7583 computeHorizontalScrollOffset(), 7584 computeHorizontalScrollExtent(), false); 7585 final int verticalScrollBarGap = drawVerticalScrollBar ? 7586 getVerticalScrollbarWidth() : 0; 7587 top = scrollY + height - size - (mUserPaddingBottom & inside); 7588 left = scrollX + (mPaddingLeft & inside); 7589 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 7590 bottom = top + size; 7591 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 7592 if (invalidate) { 7593 invalidate(left, top, right, bottom); 7594 } 7595 } 7596 7597 if (drawVerticalScrollBar) { 7598 scrollBar.setParameters(computeVerticalScrollRange(), 7599 computeVerticalScrollOffset(), 7600 computeVerticalScrollExtent(), true); 7601 switch (mVerticalScrollbarPosition) { 7602 default: 7603 case SCROLLBAR_POSITION_DEFAULT: 7604 case SCROLLBAR_POSITION_RIGHT: 7605 left = scrollX + width - size - (mUserPaddingRight & inside); 7606 break; 7607 case SCROLLBAR_POSITION_LEFT: 7608 left = scrollX + (mUserPaddingLeft & inside); 7609 break; 7610 } 7611 top = scrollY + (mPaddingTop & inside); 7612 right = left + size; 7613 bottom = scrollY + height - (mUserPaddingBottom & inside); 7614 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 7615 if (invalidate) { 7616 invalidate(left, top, right, bottom); 7617 } 7618 } 7619 } 7620 } 7621 } 7622 7623 /** 7624 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 7625 * FastScroller is visible. 7626 * @return whether to temporarily hide the vertical scrollbar 7627 * @hide 7628 */ 7629 protected boolean isVerticalScrollBarHidden() { 7630 return false; 7631 } 7632 7633 /** 7634 * <p>Draw the horizontal scrollbar if 7635 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 7636 * 7637 * @param canvas the canvas on which to draw the scrollbar 7638 * @param scrollBar the scrollbar's drawable 7639 * 7640 * @see #isHorizontalScrollBarEnabled() 7641 * @see #computeHorizontalScrollRange() 7642 * @see #computeHorizontalScrollExtent() 7643 * @see #computeHorizontalScrollOffset() 7644 * @see android.widget.ScrollBarDrawable 7645 * @hide 7646 */ 7647 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 7648 int l, int t, int r, int b) { 7649 scrollBar.setBounds(l, t, r, b); 7650 scrollBar.draw(canvas); 7651 } 7652 7653 /** 7654 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 7655 * returns true.</p> 7656 * 7657 * @param canvas the canvas on which to draw the scrollbar 7658 * @param scrollBar the scrollbar's drawable 7659 * 7660 * @see #isVerticalScrollBarEnabled() 7661 * @see #computeVerticalScrollRange() 7662 * @see #computeVerticalScrollExtent() 7663 * @see #computeVerticalScrollOffset() 7664 * @see android.widget.ScrollBarDrawable 7665 * @hide 7666 */ 7667 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 7668 int l, int t, int r, int b) { 7669 scrollBar.setBounds(l, t, r, b); 7670 scrollBar.draw(canvas); 7671 } 7672 7673 /** 7674 * Implement this to do your drawing. 7675 * 7676 * @param canvas the canvas on which the background will be drawn 7677 */ 7678 protected void onDraw(Canvas canvas) { 7679 } 7680 7681 /* 7682 * Caller is responsible for calling requestLayout if necessary. 7683 * (This allows addViewInLayout to not request a new layout.) 7684 */ 7685 void assignParent(ViewParent parent) { 7686 if (mParent == null) { 7687 mParent = parent; 7688 } else if (parent == null) { 7689 mParent = null; 7690 } else { 7691 throw new RuntimeException("view " + this + " being added, but" 7692 + " it already has a parent"); 7693 } 7694 } 7695 7696 /** 7697 * This is called when the view is attached to a window. At this point it 7698 * has a Surface and will start drawing. Note that this function is 7699 * guaranteed to be called before {@link #onDraw}, however it may be called 7700 * any time before the first onDraw -- including before or after 7701 * {@link #onMeasure}. 7702 * 7703 * @see #onDetachedFromWindow() 7704 */ 7705 protected void onAttachedToWindow() { 7706 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 7707 mParent.requestTransparentRegion(this); 7708 } 7709 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 7710 initialAwakenScrollBars(); 7711 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 7712 } 7713 jumpDrawablesToCurrentState(); 7714 } 7715 7716 /** 7717 * This is called when the view is detached from a window. At this point it 7718 * no longer has a surface for drawing. 7719 * 7720 * @see #onAttachedToWindow() 7721 */ 7722 protected void onDetachedFromWindow() { 7723 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 7724 7725 removeUnsetPressCallback(); 7726 removeLongPressCallback(); 7727 removePerformClickCallback(); 7728 7729 destroyDrawingCache(); 7730 7731 if (mHardwareLayer != null) { 7732 mHardwareLayer.destroy(); 7733 mHardwareLayer = null; 7734 } 7735 7736 if (mDisplayList != null) { 7737 mDisplayList.invalidate(); 7738 } 7739 7740 if (mAttachInfo != null) { 7741 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 7742 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_RECT_MSG, this); 7743 } 7744 7745 mCurrentAnimation = null; 7746 } 7747 7748 /** 7749 * @return The number of times this view has been attached to a window 7750 */ 7751 protected int getWindowAttachCount() { 7752 return mWindowAttachCount; 7753 } 7754 7755 /** 7756 * Retrieve a unique token identifying the window this view is attached to. 7757 * @return Return the window's token for use in 7758 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 7759 */ 7760 public IBinder getWindowToken() { 7761 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 7762 } 7763 7764 /** 7765 * Retrieve a unique token identifying the top-level "real" window of 7766 * the window that this view is attached to. That is, this is like 7767 * {@link #getWindowToken}, except if the window this view in is a panel 7768 * window (attached to another containing window), then the token of 7769 * the containing window is returned instead. 7770 * 7771 * @return Returns the associated window token, either 7772 * {@link #getWindowToken()} or the containing window's token. 7773 */ 7774 public IBinder getApplicationWindowToken() { 7775 AttachInfo ai = mAttachInfo; 7776 if (ai != null) { 7777 IBinder appWindowToken = ai.mPanelParentWindowToken; 7778 if (appWindowToken == null) { 7779 appWindowToken = ai.mWindowToken; 7780 } 7781 return appWindowToken; 7782 } 7783 return null; 7784 } 7785 7786 /** 7787 * Retrieve private session object this view hierarchy is using to 7788 * communicate with the window manager. 7789 * @return the session object to communicate with the window manager 7790 */ 7791 /*package*/ IWindowSession getWindowSession() { 7792 return mAttachInfo != null ? mAttachInfo.mSession : null; 7793 } 7794 7795 /** 7796 * @param info the {@link android.view.View.AttachInfo} to associated with 7797 * this view 7798 */ 7799 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 7800 //System.out.println("Attached! " + this); 7801 mAttachInfo = info; 7802 mWindowAttachCount++; 7803 // We will need to evaluate the drawable state at least once. 7804 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 7805 if (mFloatingTreeObserver != null) { 7806 info.mTreeObserver.merge(mFloatingTreeObserver); 7807 mFloatingTreeObserver = null; 7808 } 7809 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 7810 mAttachInfo.mScrollContainers.add(this); 7811 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 7812 } 7813 performCollectViewAttributes(visibility); 7814 onAttachedToWindow(); 7815 int vis = info.mWindowVisibility; 7816 if (vis != GONE) { 7817 onWindowVisibilityChanged(vis); 7818 } 7819 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 7820 // If nobody has evaluated the drawable state yet, then do it now. 7821 refreshDrawableState(); 7822 } 7823 } 7824 7825 void dispatchDetachedFromWindow() { 7826 //System.out.println("Detached! " + this); 7827 AttachInfo info = mAttachInfo; 7828 if (info != null) { 7829 int vis = info.mWindowVisibility; 7830 if (vis != GONE) { 7831 onWindowVisibilityChanged(GONE); 7832 } 7833 } 7834 7835 onDetachedFromWindow(); 7836 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 7837 mAttachInfo.mScrollContainers.remove(this); 7838 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 7839 } 7840 mAttachInfo = null; 7841 } 7842 7843 /** 7844 * Store this view hierarchy's frozen state into the given container. 7845 * 7846 * @param container The SparseArray in which to save the view's state. 7847 * 7848 * @see #restoreHierarchyState 7849 * @see #dispatchSaveInstanceState 7850 * @see #onSaveInstanceState 7851 */ 7852 public void saveHierarchyState(SparseArray<Parcelable> container) { 7853 dispatchSaveInstanceState(container); 7854 } 7855 7856 /** 7857 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 7858 * May be overridden to modify how freezing happens to a view's children; for example, some 7859 * views may want to not store state for their children. 7860 * 7861 * @param container The SparseArray in which to save the view's state. 7862 * 7863 * @see #dispatchRestoreInstanceState 7864 * @see #saveHierarchyState 7865 * @see #onSaveInstanceState 7866 */ 7867 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 7868 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 7869 mPrivateFlags &= ~SAVE_STATE_CALLED; 7870 Parcelable state = onSaveInstanceState(); 7871 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7872 throw new IllegalStateException( 7873 "Derived class did not call super.onSaveInstanceState()"); 7874 } 7875 if (state != null) { 7876 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 7877 // + ": " + state); 7878 container.put(mID, state); 7879 } 7880 } 7881 } 7882 7883 /** 7884 * Hook allowing a view to generate a representation of its internal state 7885 * that can later be used to create a new instance with that same state. 7886 * This state should only contain information that is not persistent or can 7887 * not be reconstructed later. For example, you will never store your 7888 * current position on screen because that will be computed again when a 7889 * new instance of the view is placed in its view hierarchy. 7890 * <p> 7891 * Some examples of things you may store here: the current cursor position 7892 * in a text view (but usually not the text itself since that is stored in a 7893 * content provider or other persistent storage), the currently selected 7894 * item in a list view. 7895 * 7896 * @return Returns a Parcelable object containing the view's current dynamic 7897 * state, or null if there is nothing interesting to save. The 7898 * default implementation returns null. 7899 * @see #onRestoreInstanceState 7900 * @see #saveHierarchyState 7901 * @see #dispatchSaveInstanceState 7902 * @see #setSaveEnabled(boolean) 7903 */ 7904 protected Parcelable onSaveInstanceState() { 7905 mPrivateFlags |= SAVE_STATE_CALLED; 7906 return BaseSavedState.EMPTY_STATE; 7907 } 7908 7909 /** 7910 * Restore this view hierarchy's frozen state from the given container. 7911 * 7912 * @param container The SparseArray which holds previously frozen states. 7913 * 7914 * @see #saveHierarchyState 7915 * @see #dispatchRestoreInstanceState 7916 * @see #onRestoreInstanceState 7917 */ 7918 public void restoreHierarchyState(SparseArray<Parcelable> container) { 7919 dispatchRestoreInstanceState(container); 7920 } 7921 7922 /** 7923 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 7924 * children. May be overridden to modify how restoreing happens to a view's children; for 7925 * example, some views may want to not store state for their children. 7926 * 7927 * @param container The SparseArray which holds previously saved state. 7928 * 7929 * @see #dispatchSaveInstanceState 7930 * @see #restoreHierarchyState 7931 * @see #onRestoreInstanceState 7932 */ 7933 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 7934 if (mID != NO_ID) { 7935 Parcelable state = container.get(mID); 7936 if (state != null) { 7937 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 7938 // + ": " + state); 7939 mPrivateFlags &= ~SAVE_STATE_CALLED; 7940 onRestoreInstanceState(state); 7941 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7942 throw new IllegalStateException( 7943 "Derived class did not call super.onRestoreInstanceState()"); 7944 } 7945 } 7946 } 7947 } 7948 7949 /** 7950 * Hook allowing a view to re-apply a representation of its internal state that had previously 7951 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 7952 * null state. 7953 * 7954 * @param state The frozen state that had previously been returned by 7955 * {@link #onSaveInstanceState}. 7956 * 7957 * @see #onSaveInstanceState 7958 * @see #restoreHierarchyState 7959 * @see #dispatchRestoreInstanceState 7960 */ 7961 protected void onRestoreInstanceState(Parcelable state) { 7962 mPrivateFlags |= SAVE_STATE_CALLED; 7963 if (state != BaseSavedState.EMPTY_STATE && state != null) { 7964 throw new IllegalArgumentException("Wrong state class, expecting View State but " 7965 + "received " + state.getClass().toString() + " instead. This usually happens " 7966 + "when two views of different type have the same id in the same hierarchy. " 7967 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 7968 + "other views do not use the same id."); 7969 } 7970 } 7971 7972 /** 7973 * <p>Return the time at which the drawing of the view hierarchy started.</p> 7974 * 7975 * @return the drawing start time in milliseconds 7976 */ 7977 public long getDrawingTime() { 7978 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 7979 } 7980 7981 /** 7982 * <p>Enables or disables the duplication of the parent's state into this view. When 7983 * duplication is enabled, this view gets its drawable state from its parent rather 7984 * than from its own internal properties.</p> 7985 * 7986 * <p>Note: in the current implementation, setting this property to true after the 7987 * view was added to a ViewGroup might have no effect at all. This property should 7988 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 7989 * 7990 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 7991 * property is enabled, an exception will be thrown.</p> 7992 * 7993 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 7994 * parent, these states should not be affected by this method.</p> 7995 * 7996 * @param enabled True to enable duplication of the parent's drawable state, false 7997 * to disable it. 7998 * 7999 * @see #getDrawableState() 8000 * @see #isDuplicateParentStateEnabled() 8001 */ 8002 public void setDuplicateParentStateEnabled(boolean enabled) { 8003 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 8004 } 8005 8006 /** 8007 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 8008 * 8009 * @return True if this view's drawable state is duplicated from the parent, 8010 * false otherwise 8011 * 8012 * @see #getDrawableState() 8013 * @see #setDuplicateParentStateEnabled(boolean) 8014 */ 8015 public boolean isDuplicateParentStateEnabled() { 8016 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 8017 } 8018 8019 /** 8020 * <p>Specifies the type of layer backing this view. The layer can be 8021 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 8022 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 8023 * 8024 * <p>A layer is associated with an optional {@link android.graphics.Paint} 8025 * instance that controls how the layer is composed on screen. The following 8026 * properties of the paint are taken into account when composing the layer:</p> 8027 * <ul> 8028 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 8029 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 8030 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 8031 * </ul> 8032 * 8033 * <p>If this view has an alpha value set to < 1.0 by calling 8034 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 8035 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 8036 * equivalent to setting a hardware layer on this view and providing a paint with 8037 * the desired alpha value.<p> 8038 * 8039 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 8040 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 8041 * for more information on when and how to use layers.</p> 8042 * 8043 * @param layerType The ype of layer to use with this view, must be one of 8044 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 8045 * {@link #LAYER_TYPE_HARDWARE} 8046 * @param paint The paint used to compose the layer. This argument is optional 8047 * and can be null. It is ignored when the layer type is 8048 * {@link #LAYER_TYPE_NONE} 8049 * 8050 * @see #getLayerType() 8051 * @see #LAYER_TYPE_NONE 8052 * @see #LAYER_TYPE_SOFTWARE 8053 * @see #LAYER_TYPE_HARDWARE 8054 * @see #setAlpha(float) 8055 * 8056 * @attr ref android.R.styleable#View_layerType 8057 */ 8058 public void setLayerType(int layerType, Paint paint) { 8059 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 8060 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 8061 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 8062 } 8063 8064 if (layerType == mLayerType) { 8065 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 8066 mLayerPaint = paint == null ? new Paint() : paint; 8067 if (mParent instanceof ViewGroup) { 8068 ((ViewGroup) mParent).invalidate(); 8069 } 8070 invalidate(); 8071 } 8072 return; 8073 } 8074 8075 // Destroy any previous software drawing cache if needed 8076 switch (mLayerType) { 8077 case LAYER_TYPE_SOFTWARE: 8078 if (mDrawingCache != null) { 8079 mDrawingCache.recycle(); 8080 mDrawingCache = null; 8081 } 8082 8083 if (mUnscaledDrawingCache != null) { 8084 mUnscaledDrawingCache.recycle(); 8085 mUnscaledDrawingCache = null; 8086 } 8087 break; 8088 case LAYER_TYPE_HARDWARE: 8089 if (mHardwareLayer != null) { 8090 mHardwareLayer.destroy(); 8091 mHardwareLayer = null; 8092 } 8093 break; 8094 default: 8095 break; 8096 } 8097 8098 mLayerType = layerType; 8099 mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : (paint == null ? new Paint() : paint); 8100 8101 if (mParent instanceof ViewGroup) { 8102 ((ViewGroup) mParent).invalidate(); 8103 } 8104 invalidate(); 8105 } 8106 8107 /** 8108 * Indicates what type of layer is currently associated with this view. By default 8109 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 8110 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 8111 * for more information on the different types of layers. 8112 * 8113 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 8114 * {@link #LAYER_TYPE_HARDWARE} 8115 * 8116 * @see #setLayerType(int, android.graphics.Paint) 8117 * @see #LAYER_TYPE_NONE 8118 * @see #LAYER_TYPE_SOFTWARE 8119 * @see #LAYER_TYPE_HARDWARE 8120 */ 8121 public int getLayerType() { 8122 return mLayerType; 8123 } 8124 8125 /** 8126 * <p>Returns a hardware layer that can be used to draw this view again 8127 * without executing its draw method.</p> 8128 * 8129 * @return A HardwareLayer ready to render, or null if an error occurred. 8130 */ 8131 HardwareLayer getHardwareLayer(Canvas currentCanvas) { 8132 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8133 return null; 8134 } 8135 8136 final int width = mRight - mLeft; 8137 final int height = mBottom - mTop; 8138 8139 if (width == 0 || height == 0) { 8140 return null; 8141 } 8142 8143 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 8144 if (mHardwareLayer == null) { 8145 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 8146 width, height, isOpaque()); 8147 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 8148 mHardwareLayer.resize(width, height); 8149 } 8150 8151 final HardwareCanvas canvas = mHardwareLayer.start(mAttachInfo.mHardwareCanvas); 8152 try { 8153 canvas.setViewport(width, height); 8154 // TODO: We should pass the dirty rect 8155 canvas.onPreDraw(null); 8156 8157 computeScroll(); 8158 canvas.translate(-mScrollX, -mScrollY); 8159 8160 final int restoreCount = canvas.save(); 8161 8162 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8163 8164 // Fast path for layouts with no backgrounds 8165 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8166 mPrivateFlags &= ~DIRTY_MASK; 8167 dispatchDraw(canvas); 8168 } else { 8169 draw(canvas); 8170 } 8171 8172 canvas.restoreToCount(restoreCount); 8173 } finally { 8174 canvas.onPostDraw(); 8175 mHardwareLayer.end(mAttachInfo.mHardwareCanvas); 8176 } 8177 } 8178 8179 return mHardwareLayer; 8180 } 8181 8182 /** 8183 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 8184 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 8185 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 8186 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 8187 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 8188 * null.</p> 8189 * 8190 * <p>Enabling the drawing cache is similar to 8191 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 8192 * acceleration is turned off. When hardware acceleration is turned on, enabling the 8193 * drawing cache has no effect on rendering because the system uses a different mechanism 8194 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 8195 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 8196 * for information on how to enable software and hardware layers.</p> 8197 * 8198 * <p>This API can be used to manually generate 8199 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 8200 * {@link #getDrawingCache()}.</p> 8201 * 8202 * @param enabled true to enable the drawing cache, false otherwise 8203 * 8204 * @see #isDrawingCacheEnabled() 8205 * @see #getDrawingCache() 8206 * @see #buildDrawingCache() 8207 * @see #setLayerType(int, android.graphics.Paint) 8208 */ 8209 public void setDrawingCacheEnabled(boolean enabled) { 8210 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 8211 } 8212 8213 /** 8214 * <p>Indicates whether the drawing cache is enabled for this view.</p> 8215 * 8216 * @return true if the drawing cache is enabled 8217 * 8218 * @see #setDrawingCacheEnabled(boolean) 8219 * @see #getDrawingCache() 8220 */ 8221 @ViewDebug.ExportedProperty(category = "drawing") 8222 public boolean isDrawingCacheEnabled() { 8223 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 8224 } 8225 8226 /** 8227 * Debugging utility which recursively outputs the dirty state of a view and its 8228 * descendants. 8229 * 8230 * @hide 8231 */ 8232 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 8233 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 8234 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 8235 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 8236 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 8237 if (clear) { 8238 mPrivateFlags &= clearMask; 8239 } 8240 if (this instanceof ViewGroup) { 8241 ViewGroup parent = (ViewGroup) this; 8242 final int count = parent.getChildCount(); 8243 for (int i = 0; i < count; i++) { 8244 final View child = parent.getChildAt(i); 8245 child.outputDirtyFlags(indent + " ", clear, clearMask); 8246 } 8247 } 8248 } 8249 8250 /** 8251 * This method is used by ViewGroup to cause its children to restore or recreate their 8252 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 8253 * to recreate its own display list, which would happen if it went through the normal 8254 * draw/dispatchDraw mechanisms. 8255 * 8256 * @hide 8257 */ 8258 protected void dispatchGetDisplayList() {} 8259 8260 /** 8261 * <p>Returns a display list that can be used to draw this view again 8262 * without executing its draw method.</p> 8263 * 8264 * @return A DisplayList ready to replay, or null if caching is not enabled. 8265 * 8266 * @hide 8267 */ 8268 public DisplayList getDisplayList() { 8269 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8270 return null; 8271 } 8272 8273 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 8274 mDisplayList == null || !mDisplayList.isValid() || 8275 mRecreateDisplayList)) { 8276 // Don't need to recreate the display list, just need to tell our 8277 // children to restore/recreate theirs 8278 if (mDisplayList != null && mDisplayList.isValid() && 8279 !mRecreateDisplayList) { 8280 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8281 mPrivateFlags &= ~DIRTY_MASK; 8282 dispatchGetDisplayList(); 8283 8284 return mDisplayList; 8285 } 8286 8287 // If we got here, we're recreating it. Mark it as such to ensure that 8288 // we copy in child display lists into ours in drawChild() 8289 mRecreateDisplayList = true; 8290 8291 if (mDisplayList == null) { 8292 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(this); 8293 // If we're creating a new display list, make sure our parent gets invalidated 8294 // since they will need to recreate their display list to account for this 8295 // new child display list. 8296 invalidateParentIfAccelerated(); 8297 } 8298 8299 final HardwareCanvas canvas = mDisplayList.start(); 8300 try { 8301 int width = mRight - mLeft; 8302 int height = mBottom - mTop; 8303 8304 canvas.setViewport(width, height); 8305 // The dirty rect should always be null for a display list 8306 canvas.onPreDraw(null); 8307 8308 final int restoreCount = canvas.save(); 8309 8310 computeScroll(); 8311 canvas.translate(-mScrollX, -mScrollY); 8312 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8313 8314 // Fast path for layouts with no backgrounds 8315 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8316 mPrivateFlags &= ~DIRTY_MASK; 8317 dispatchDraw(canvas); 8318 } else { 8319 draw(canvas); 8320 } 8321 8322 canvas.restoreToCount(restoreCount); 8323 } finally { 8324 canvas.onPostDraw(); 8325 8326 mDisplayList.end(); 8327 } 8328 } 8329 8330 return mDisplayList; 8331 } 8332 8333 /** 8334 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 8335 * 8336 * @return A non-scaled bitmap representing this view or null if cache is disabled. 8337 * 8338 * @see #getDrawingCache(boolean) 8339 */ 8340 public Bitmap getDrawingCache() { 8341 return getDrawingCache(false); 8342 } 8343 8344 /** 8345 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 8346 * is null when caching is disabled. If caching is enabled and the cache is not ready, 8347 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 8348 * draw from the cache when the cache is enabled. To benefit from the cache, you must 8349 * request the drawing cache by calling this method and draw it on screen if the 8350 * returned bitmap is not null.</p> 8351 * 8352 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8353 * this method will create a bitmap of the same size as this view. Because this bitmap 8354 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8355 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8356 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8357 * size than the view. This implies that your application must be able to handle this 8358 * size.</p> 8359 * 8360 * @param autoScale Indicates whether the generated bitmap should be scaled based on 8361 * the current density of the screen when the application is in compatibility 8362 * mode. 8363 * 8364 * @return A bitmap representing this view or null if cache is disabled. 8365 * 8366 * @see #setDrawingCacheEnabled(boolean) 8367 * @see #isDrawingCacheEnabled() 8368 * @see #buildDrawingCache(boolean) 8369 * @see #destroyDrawingCache() 8370 */ 8371 public Bitmap getDrawingCache(boolean autoScale) { 8372 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8373 return null; 8374 } 8375 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 8376 buildDrawingCache(autoScale); 8377 } 8378 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 8379 } 8380 8381 /** 8382 * <p>Frees the resources used by the drawing cache. If you call 8383 * {@link #buildDrawingCache()} manually without calling 8384 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8385 * should cleanup the cache with this method afterwards.</p> 8386 * 8387 * @see #setDrawingCacheEnabled(boolean) 8388 * @see #buildDrawingCache() 8389 * @see #getDrawingCache() 8390 */ 8391 public void destroyDrawingCache() { 8392 if (mDrawingCache != null) { 8393 mDrawingCache.recycle(); 8394 mDrawingCache = null; 8395 } 8396 if (mUnscaledDrawingCache != null) { 8397 mUnscaledDrawingCache.recycle(); 8398 mUnscaledDrawingCache = null; 8399 } 8400 } 8401 8402 /** 8403 * Setting a solid background color for the drawing cache's bitmaps will improve 8404 * perfromance and memory usage. Note, though that this should only be used if this 8405 * view will always be drawn on top of a solid color. 8406 * 8407 * @param color The background color to use for the drawing cache's bitmap 8408 * 8409 * @see #setDrawingCacheEnabled(boolean) 8410 * @see #buildDrawingCache() 8411 * @see #getDrawingCache() 8412 */ 8413 public void setDrawingCacheBackgroundColor(int color) { 8414 if (color != mDrawingCacheBackgroundColor) { 8415 mDrawingCacheBackgroundColor = color; 8416 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8417 } 8418 } 8419 8420 /** 8421 * @see #setDrawingCacheBackgroundColor(int) 8422 * 8423 * @return The background color to used for the drawing cache's bitmap 8424 */ 8425 public int getDrawingCacheBackgroundColor() { 8426 return mDrawingCacheBackgroundColor; 8427 } 8428 8429 /** 8430 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 8431 * 8432 * @see #buildDrawingCache(boolean) 8433 */ 8434 public void buildDrawingCache() { 8435 buildDrawingCache(false); 8436 } 8437 8438 /** 8439 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 8440 * 8441 * <p>If you call {@link #buildDrawingCache()} manually without calling 8442 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8443 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 8444 * 8445 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8446 * this method will create a bitmap of the same size as this view. Because this bitmap 8447 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8448 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8449 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8450 * size than the view. This implies that your application must be able to handle this 8451 * size.</p> 8452 * 8453 * <p>You should avoid calling this method when hardware acceleration is enabled. If 8454 * you do not need the drawing cache bitmap, calling this method will increase memory 8455 * usage and cause the view to be rendered in software once, thus negatively impacting 8456 * performance.</p> 8457 * 8458 * @see #getDrawingCache() 8459 * @see #destroyDrawingCache() 8460 */ 8461 public void buildDrawingCache(boolean autoScale) { 8462 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 8463 mDrawingCache == null : mUnscaledDrawingCache == null)) { 8464 8465 if (ViewDebug.TRACE_HIERARCHY) { 8466 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 8467 } 8468 8469 int width = mRight - mLeft; 8470 int height = mBottom - mTop; 8471 8472 final AttachInfo attachInfo = mAttachInfo; 8473 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 8474 8475 if (autoScale && scalingRequired) { 8476 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 8477 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 8478 } 8479 8480 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 8481 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 8482 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 8483 8484 if (width <= 0 || height <= 0 || 8485 // Projected bitmap size in bytes 8486 (width * height * (opaque && !use32BitCache ? 2 : 4) > 8487 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 8488 destroyDrawingCache(); 8489 return; 8490 } 8491 8492 boolean clear = true; 8493 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 8494 8495 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 8496 Bitmap.Config quality; 8497 if (!opaque) { 8498 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 8499 case DRAWING_CACHE_QUALITY_AUTO: 8500 quality = Bitmap.Config.ARGB_8888; 8501 break; 8502 case DRAWING_CACHE_QUALITY_LOW: 8503 quality = Bitmap.Config.ARGB_4444; 8504 break; 8505 case DRAWING_CACHE_QUALITY_HIGH: 8506 quality = Bitmap.Config.ARGB_8888; 8507 break; 8508 default: 8509 quality = Bitmap.Config.ARGB_8888; 8510 break; 8511 } 8512 } else { 8513 // Optimization for translucent windows 8514 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 8515 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 8516 } 8517 8518 // Try to cleanup memory 8519 if (bitmap != null) bitmap.recycle(); 8520 8521 try { 8522 bitmap = Bitmap.createBitmap(width, height, quality); 8523 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8524 if (autoScale) { 8525 mDrawingCache = bitmap; 8526 } else { 8527 mUnscaledDrawingCache = bitmap; 8528 } 8529 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 8530 } catch (OutOfMemoryError e) { 8531 // If there is not enough memory to create the bitmap cache, just 8532 // ignore the issue as bitmap caches are not required to draw the 8533 // view hierarchy 8534 if (autoScale) { 8535 mDrawingCache = null; 8536 } else { 8537 mUnscaledDrawingCache = null; 8538 } 8539 return; 8540 } 8541 8542 clear = drawingCacheBackgroundColor != 0; 8543 } 8544 8545 Canvas canvas; 8546 if (attachInfo != null) { 8547 canvas = attachInfo.mCanvas; 8548 if (canvas == null) { 8549 canvas = new Canvas(); 8550 } 8551 canvas.setBitmap(bitmap); 8552 // Temporarily clobber the cached Canvas in case one of our children 8553 // is also using a drawing cache. Without this, the children would 8554 // steal the canvas by attaching their own bitmap to it and bad, bad 8555 // thing would happen (invisible views, corrupted drawings, etc.) 8556 attachInfo.mCanvas = null; 8557 } else { 8558 // This case should hopefully never or seldom happen 8559 canvas = new Canvas(bitmap); 8560 } 8561 8562 if (clear) { 8563 bitmap.eraseColor(drawingCacheBackgroundColor); 8564 } 8565 8566 computeScroll(); 8567 final int restoreCount = canvas.save(); 8568 8569 if (autoScale && scalingRequired) { 8570 final float scale = attachInfo.mApplicationScale; 8571 canvas.scale(scale, scale); 8572 } 8573 8574 canvas.translate(-mScrollX, -mScrollY); 8575 8576 mPrivateFlags |= DRAWN; 8577 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 8578 mLayerType != LAYER_TYPE_NONE) { 8579 mPrivateFlags |= DRAWING_CACHE_VALID; 8580 } 8581 8582 // Fast path for layouts with no backgrounds 8583 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8584 if (ViewDebug.TRACE_HIERARCHY) { 8585 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8586 } 8587 mPrivateFlags &= ~DIRTY_MASK; 8588 dispatchDraw(canvas); 8589 } else { 8590 draw(canvas); 8591 } 8592 8593 canvas.restoreToCount(restoreCount); 8594 8595 if (attachInfo != null) { 8596 // Restore the cached Canvas for our siblings 8597 attachInfo.mCanvas = canvas; 8598 } 8599 } 8600 } 8601 8602 /** 8603 * Create a snapshot of the view into a bitmap. We should probably make 8604 * some form of this public, but should think about the API. 8605 */ 8606 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 8607 int width = mRight - mLeft; 8608 int height = mBottom - mTop; 8609 8610 final AttachInfo attachInfo = mAttachInfo; 8611 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 8612 width = (int) ((width * scale) + 0.5f); 8613 height = (int) ((height * scale) + 0.5f); 8614 8615 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 8616 if (bitmap == null) { 8617 throw new OutOfMemoryError(); 8618 } 8619 8620 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8621 8622 Canvas canvas; 8623 if (attachInfo != null) { 8624 canvas = attachInfo.mCanvas; 8625 if (canvas == null) { 8626 canvas = new Canvas(); 8627 } 8628 canvas.setBitmap(bitmap); 8629 // Temporarily clobber the cached Canvas in case one of our children 8630 // is also using a drawing cache. Without this, the children would 8631 // steal the canvas by attaching their own bitmap to it and bad, bad 8632 // things would happen (invisible views, corrupted drawings, etc.) 8633 attachInfo.mCanvas = null; 8634 } else { 8635 // This case should hopefully never or seldom happen 8636 canvas = new Canvas(bitmap); 8637 } 8638 8639 if ((backgroundColor & 0xff000000) != 0) { 8640 bitmap.eraseColor(backgroundColor); 8641 } 8642 8643 computeScroll(); 8644 final int restoreCount = canvas.save(); 8645 canvas.scale(scale, scale); 8646 canvas.translate(-mScrollX, -mScrollY); 8647 8648 // Temporarily remove the dirty mask 8649 int flags = mPrivateFlags; 8650 mPrivateFlags &= ~DIRTY_MASK; 8651 8652 // Fast path for layouts with no backgrounds 8653 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8654 dispatchDraw(canvas); 8655 } else { 8656 draw(canvas); 8657 } 8658 8659 mPrivateFlags = flags; 8660 8661 canvas.restoreToCount(restoreCount); 8662 8663 if (attachInfo != null) { 8664 // Restore the cached Canvas for our siblings 8665 attachInfo.mCanvas = canvas; 8666 } 8667 8668 return bitmap; 8669 } 8670 8671 /** 8672 * Indicates whether this View is currently in edit mode. A View is usually 8673 * in edit mode when displayed within a developer tool. For instance, if 8674 * this View is being drawn by a visual user interface builder, this method 8675 * should return true. 8676 * 8677 * Subclasses should check the return value of this method to provide 8678 * different behaviors if their normal behavior might interfere with the 8679 * host environment. For instance: the class spawns a thread in its 8680 * constructor, the drawing code relies on device-specific features, etc. 8681 * 8682 * This method is usually checked in the drawing code of custom widgets. 8683 * 8684 * @return True if this View is in edit mode, false otherwise. 8685 */ 8686 public boolean isInEditMode() { 8687 return false; 8688 } 8689 8690 /** 8691 * If the View draws content inside its padding and enables fading edges, 8692 * it needs to support padding offsets. Padding offsets are added to the 8693 * fading edges to extend the length of the fade so that it covers pixels 8694 * drawn inside the padding. 8695 * 8696 * Subclasses of this class should override this method if they need 8697 * to draw content inside the padding. 8698 * 8699 * @return True if padding offset must be applied, false otherwise. 8700 * 8701 * @see #getLeftPaddingOffset() 8702 * @see #getRightPaddingOffset() 8703 * @see #getTopPaddingOffset() 8704 * @see #getBottomPaddingOffset() 8705 * 8706 * @since CURRENT 8707 */ 8708 protected boolean isPaddingOffsetRequired() { 8709 return false; 8710 } 8711 8712 /** 8713 * Amount by which to extend the left fading region. Called only when 8714 * {@link #isPaddingOffsetRequired()} returns true. 8715 * 8716 * @return The left padding offset in pixels. 8717 * 8718 * @see #isPaddingOffsetRequired() 8719 * 8720 * @since CURRENT 8721 */ 8722 protected int getLeftPaddingOffset() { 8723 return 0; 8724 } 8725 8726 /** 8727 * Amount by which to extend the right fading region. Called only when 8728 * {@link #isPaddingOffsetRequired()} returns true. 8729 * 8730 * @return The right padding offset in pixels. 8731 * 8732 * @see #isPaddingOffsetRequired() 8733 * 8734 * @since CURRENT 8735 */ 8736 protected int getRightPaddingOffset() { 8737 return 0; 8738 } 8739 8740 /** 8741 * Amount by which to extend the top fading region. Called only when 8742 * {@link #isPaddingOffsetRequired()} returns true. 8743 * 8744 * @return The top padding offset in pixels. 8745 * 8746 * @see #isPaddingOffsetRequired() 8747 * 8748 * @since CURRENT 8749 */ 8750 protected int getTopPaddingOffset() { 8751 return 0; 8752 } 8753 8754 /** 8755 * Amount by which to extend the bottom fading region. Called only when 8756 * {@link #isPaddingOffsetRequired()} returns true. 8757 * 8758 * @return The bottom padding offset in pixels. 8759 * 8760 * @see #isPaddingOffsetRequired() 8761 * 8762 * @since CURRENT 8763 */ 8764 protected int getBottomPaddingOffset() { 8765 return 0; 8766 } 8767 8768 /** 8769 * <p>Indicates whether this view is attached to an hardware accelerated 8770 * window or not.</p> 8771 * 8772 * <p>Even if this method returns true, it does not mean that every call 8773 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 8774 * accelerated {@link android.graphics.Canvas}. For instance, if this view 8775 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 8776 * window is hardware accelerated, 8777 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 8778 * return false, and this method will return true.</p> 8779 * 8780 * @return True if the view is attached to a window and the window is 8781 * hardware accelerated; false in any other case. 8782 */ 8783 public boolean isHardwareAccelerated() { 8784 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 8785 } 8786 8787 /** 8788 * Manually render this view (and all of its children) to the given Canvas. 8789 * The view must have already done a full layout before this function is 8790 * called. When implementing a view, implement {@link #onDraw} instead of 8791 * overriding this method. If you do need to override this method, call 8792 * the superclass version. 8793 * 8794 * @param canvas The Canvas to which the View is rendered. 8795 */ 8796 public void draw(Canvas canvas) { 8797 if (ViewDebug.TRACE_HIERARCHY) { 8798 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8799 } 8800 8801 final int privateFlags = mPrivateFlags; 8802 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 8803 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 8804 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 8805 8806 /* 8807 * Draw traversal performs several drawing steps which must be executed 8808 * in the appropriate order: 8809 * 8810 * 1. Draw the background 8811 * 2. If necessary, save the canvas' layers to prepare for fading 8812 * 3. Draw view's content 8813 * 4. Draw children 8814 * 5. If necessary, draw the fading edges and restore layers 8815 * 6. Draw decorations (scrollbars for instance) 8816 */ 8817 8818 // Step 1, draw the background, if needed 8819 int saveCount; 8820 8821 if (!dirtyOpaque) { 8822 final Drawable background = mBGDrawable; 8823 if (background != null) { 8824 final int scrollX = mScrollX; 8825 final int scrollY = mScrollY; 8826 8827 if (mBackgroundSizeChanged) { 8828 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 8829 mBackgroundSizeChanged = false; 8830 } 8831 8832 if ((scrollX | scrollY) == 0) { 8833 background.draw(canvas); 8834 } else { 8835 canvas.translate(scrollX, scrollY); 8836 background.draw(canvas); 8837 canvas.translate(-scrollX, -scrollY); 8838 } 8839 } 8840 } 8841 8842 // skip step 2 & 5 if possible (common case) 8843 final int viewFlags = mViewFlags; 8844 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 8845 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 8846 if (!verticalEdges && !horizontalEdges) { 8847 // Step 3, draw the content 8848 if (!dirtyOpaque) onDraw(canvas); 8849 8850 // Step 4, draw the children 8851 dispatchDraw(canvas); 8852 8853 // Step 6, draw decorations (scrollbars) 8854 onDrawScrollBars(canvas); 8855 8856 // we're done... 8857 return; 8858 } 8859 8860 /* 8861 * Here we do the full fledged routine... 8862 * (this is an uncommon case where speed matters less, 8863 * this is why we repeat some of the tests that have been 8864 * done above) 8865 */ 8866 8867 boolean drawTop = false; 8868 boolean drawBottom = false; 8869 boolean drawLeft = false; 8870 boolean drawRight = false; 8871 8872 float topFadeStrength = 0.0f; 8873 float bottomFadeStrength = 0.0f; 8874 float leftFadeStrength = 0.0f; 8875 float rightFadeStrength = 0.0f; 8876 8877 // Step 2, save the canvas' layers 8878 int paddingLeft = mPaddingLeft; 8879 int paddingTop = mPaddingTop; 8880 8881 final boolean offsetRequired = isPaddingOffsetRequired(); 8882 if (offsetRequired) { 8883 paddingLeft += getLeftPaddingOffset(); 8884 paddingTop += getTopPaddingOffset(); 8885 } 8886 8887 int left = mScrollX + paddingLeft; 8888 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 8889 int top = mScrollY + paddingTop; 8890 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 8891 8892 if (offsetRequired) { 8893 right += getRightPaddingOffset(); 8894 bottom += getBottomPaddingOffset(); 8895 } 8896 8897 final ScrollabilityCache scrollabilityCache = mScrollCache; 8898 int length = scrollabilityCache.fadingEdgeLength; 8899 8900 // clip the fade length if top and bottom fades overlap 8901 // overlapping fades produce odd-looking artifacts 8902 if (verticalEdges && (top + length > bottom - length)) { 8903 length = (bottom - top) / 2; 8904 } 8905 8906 // also clip horizontal fades if necessary 8907 if (horizontalEdges && (left + length > right - length)) { 8908 length = (right - left) / 2; 8909 } 8910 8911 if (verticalEdges) { 8912 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 8913 drawTop = topFadeStrength > 0.0f; 8914 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 8915 drawBottom = bottomFadeStrength > 0.0f; 8916 } 8917 8918 if (horizontalEdges) { 8919 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 8920 drawLeft = leftFadeStrength > 0.0f; 8921 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 8922 drawRight = rightFadeStrength > 0.0f; 8923 } 8924 8925 saveCount = canvas.getSaveCount(); 8926 8927 int solidColor = getSolidColor(); 8928 if (solidColor == 0) { 8929 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 8930 8931 if (drawTop) { 8932 canvas.saveLayer(left, top, right, top + length, null, flags); 8933 } 8934 8935 if (drawBottom) { 8936 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 8937 } 8938 8939 if (drawLeft) { 8940 canvas.saveLayer(left, top, left + length, bottom, null, flags); 8941 } 8942 8943 if (drawRight) { 8944 canvas.saveLayer(right - length, top, right, bottom, null, flags); 8945 } 8946 } else { 8947 scrollabilityCache.setFadeColor(solidColor); 8948 } 8949 8950 // Step 3, draw the content 8951 if (!dirtyOpaque) onDraw(canvas); 8952 8953 // Step 4, draw the children 8954 dispatchDraw(canvas); 8955 8956 // Step 5, draw the fade effect and restore layers 8957 final Paint p = scrollabilityCache.paint; 8958 final Matrix matrix = scrollabilityCache.matrix; 8959 final Shader fade = scrollabilityCache.shader; 8960 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 8961 8962 if (drawTop) { 8963 matrix.setScale(1, fadeHeight * topFadeStrength); 8964 matrix.postTranslate(left, top); 8965 fade.setLocalMatrix(matrix); 8966 canvas.drawRect(left, top, right, top + length, p); 8967 } 8968 8969 if (drawBottom) { 8970 matrix.setScale(1, fadeHeight * bottomFadeStrength); 8971 matrix.postRotate(180); 8972 matrix.postTranslate(left, bottom); 8973 fade.setLocalMatrix(matrix); 8974 canvas.drawRect(left, bottom - length, right, bottom, p); 8975 } 8976 8977 if (drawLeft) { 8978 matrix.setScale(1, fadeHeight * leftFadeStrength); 8979 matrix.postRotate(-90); 8980 matrix.postTranslate(left, top); 8981 fade.setLocalMatrix(matrix); 8982 canvas.drawRect(left, top, left + length, bottom, p); 8983 } 8984 8985 if (drawRight) { 8986 matrix.setScale(1, fadeHeight * rightFadeStrength); 8987 matrix.postRotate(90); 8988 matrix.postTranslate(right, top); 8989 fade.setLocalMatrix(matrix); 8990 canvas.drawRect(right - length, top, right, bottom, p); 8991 } 8992 8993 canvas.restoreToCount(saveCount); 8994 8995 // Step 6, draw decorations (scrollbars) 8996 onDrawScrollBars(canvas); 8997 } 8998 8999 /** 9000 * Override this if your view is known to always be drawn on top of a solid color background, 9001 * and needs to draw fading edges. Returning a non-zero color enables the view system to 9002 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 9003 * should be set to 0xFF. 9004 * 9005 * @see #setVerticalFadingEdgeEnabled 9006 * @see #setHorizontalFadingEdgeEnabled 9007 * 9008 * @return The known solid color background for this view, or 0 if the color may vary 9009 */ 9010 public int getSolidColor() { 9011 return 0; 9012 } 9013 9014 /** 9015 * Build a human readable string representation of the specified view flags. 9016 * 9017 * @param flags the view flags to convert to a string 9018 * @return a String representing the supplied flags 9019 */ 9020 private static String printFlags(int flags) { 9021 String output = ""; 9022 int numFlags = 0; 9023 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 9024 output += "TAKES_FOCUS"; 9025 numFlags++; 9026 } 9027 9028 switch (flags & VISIBILITY_MASK) { 9029 case INVISIBLE: 9030 if (numFlags > 0) { 9031 output += " "; 9032 } 9033 output += "INVISIBLE"; 9034 // USELESS HERE numFlags++; 9035 break; 9036 case GONE: 9037 if (numFlags > 0) { 9038 output += " "; 9039 } 9040 output += "GONE"; 9041 // USELESS HERE numFlags++; 9042 break; 9043 default: 9044 break; 9045 } 9046 return output; 9047 } 9048 9049 /** 9050 * Build a human readable string representation of the specified private 9051 * view flags. 9052 * 9053 * @param privateFlags the private view flags to convert to a string 9054 * @return a String representing the supplied flags 9055 */ 9056 private static String printPrivateFlags(int privateFlags) { 9057 String output = ""; 9058 int numFlags = 0; 9059 9060 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 9061 output += "WANTS_FOCUS"; 9062 numFlags++; 9063 } 9064 9065 if ((privateFlags & FOCUSED) == FOCUSED) { 9066 if (numFlags > 0) { 9067 output += " "; 9068 } 9069 output += "FOCUSED"; 9070 numFlags++; 9071 } 9072 9073 if ((privateFlags & SELECTED) == SELECTED) { 9074 if (numFlags > 0) { 9075 output += " "; 9076 } 9077 output += "SELECTED"; 9078 numFlags++; 9079 } 9080 9081 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 9082 if (numFlags > 0) { 9083 output += " "; 9084 } 9085 output += "IS_ROOT_NAMESPACE"; 9086 numFlags++; 9087 } 9088 9089 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 9090 if (numFlags > 0) { 9091 output += " "; 9092 } 9093 output += "HAS_BOUNDS"; 9094 numFlags++; 9095 } 9096 9097 if ((privateFlags & DRAWN) == DRAWN) { 9098 if (numFlags > 0) { 9099 output += " "; 9100 } 9101 output += "DRAWN"; 9102 // USELESS HERE numFlags++; 9103 } 9104 return output; 9105 } 9106 9107 /** 9108 * <p>Indicates whether or not this view's layout will be requested during 9109 * the next hierarchy layout pass.</p> 9110 * 9111 * @return true if the layout will be forced during next layout pass 9112 */ 9113 public boolean isLayoutRequested() { 9114 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 9115 } 9116 9117 /** 9118 * Assign a size and position to a view and all of its 9119 * descendants 9120 * 9121 * <p>This is the second phase of the layout mechanism. 9122 * (The first is measuring). In this phase, each parent calls 9123 * layout on all of its children to position them. 9124 * This is typically done using the child measurements 9125 * that were stored in the measure pass().</p> 9126 * 9127 * <p>Derived classes should not override this method. 9128 * Derived classes with children should override 9129 * onLayout. In that method, they should 9130 * call layout on each of their children.</p> 9131 * 9132 * @param l Left position, relative to parent 9133 * @param t Top position, relative to parent 9134 * @param r Right position, relative to parent 9135 * @param b Bottom position, relative to parent 9136 */ 9137 @SuppressWarnings({"unchecked"}) 9138 public void layout(int l, int t, int r, int b) { 9139 int oldL = mLeft; 9140 int oldT = mTop; 9141 int oldB = mBottom; 9142 int oldR = mRight; 9143 boolean changed = setFrame(l, t, r, b); 9144 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 9145 if (ViewDebug.TRACE_HIERARCHY) { 9146 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 9147 } 9148 9149 onLayout(changed, l, t, r, b); 9150 mPrivateFlags &= ~LAYOUT_REQUIRED; 9151 9152 if (mOnLayoutChangeListeners != null) { 9153 ArrayList<OnLayoutChangeListener> listenersCopy = 9154 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 9155 int numListeners = listenersCopy.size(); 9156 for (int i = 0; i < numListeners; ++i) { 9157 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 9158 } 9159 } 9160 } 9161 mPrivateFlags &= ~FORCE_LAYOUT; 9162 } 9163 9164 /** 9165 * Called from layout when this view should 9166 * assign a size and position to each of its children. 9167 * 9168 * Derived classes with children should override 9169 * this method and call layout on each of 9170 * their children. 9171 * @param changed This is a new size or position for this view 9172 * @param left Left position, relative to parent 9173 * @param top Top position, relative to parent 9174 * @param right Right position, relative to parent 9175 * @param bottom Bottom position, relative to parent 9176 */ 9177 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 9178 } 9179 9180 /** 9181 * Assign a size and position to this view. 9182 * 9183 * This is called from layout. 9184 * 9185 * @param left Left position, relative to parent 9186 * @param top Top position, relative to parent 9187 * @param right Right position, relative to parent 9188 * @param bottom Bottom position, relative to parent 9189 * @return true if the new size and position are different than the 9190 * previous ones 9191 * {@hide} 9192 */ 9193 protected boolean setFrame(int left, int top, int right, int bottom) { 9194 boolean changed = false; 9195 9196 if (DBG) { 9197 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 9198 + right + "," + bottom + ")"); 9199 } 9200 9201 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 9202 changed = true; 9203 9204 // Remember our drawn bit 9205 int drawn = mPrivateFlags & DRAWN; 9206 9207 // Invalidate our old position 9208 invalidate(); 9209 9210 9211 int oldWidth = mRight - mLeft; 9212 int oldHeight = mBottom - mTop; 9213 9214 mLeft = left; 9215 mTop = top; 9216 mRight = right; 9217 mBottom = bottom; 9218 9219 mPrivateFlags |= HAS_BOUNDS; 9220 9221 int newWidth = right - left; 9222 int newHeight = bottom - top; 9223 9224 if (newWidth != oldWidth || newHeight != oldHeight) { 9225 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9226 // A change in dimension means an auto-centered pivot point changes, too 9227 mMatrixDirty = true; 9228 } 9229 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 9230 } 9231 9232 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 9233 // If we are visible, force the DRAWN bit to on so that 9234 // this invalidate will go through (at least to our parent). 9235 // This is because someone may have invalidated this view 9236 // before this call to setFrame came in, thereby clearing 9237 // the DRAWN bit. 9238 mPrivateFlags |= DRAWN; 9239 invalidate(); 9240 } 9241 9242 // Reset drawn bit to original value (invalidate turns it off) 9243 mPrivateFlags |= drawn; 9244 9245 mBackgroundSizeChanged = true; 9246 } 9247 return changed; 9248 } 9249 9250 /** 9251 * Finalize inflating a view from XML. This is called as the last phase 9252 * of inflation, after all child views have been added. 9253 * 9254 * <p>Even if the subclass overrides onFinishInflate, they should always be 9255 * sure to call the super method, so that we get called. 9256 */ 9257 protected void onFinishInflate() { 9258 } 9259 9260 /** 9261 * Returns the resources associated with this view. 9262 * 9263 * @return Resources object. 9264 */ 9265 public Resources getResources() { 9266 return mResources; 9267 } 9268 9269 /** 9270 * Invalidates the specified Drawable. 9271 * 9272 * @param drawable the drawable to invalidate 9273 */ 9274 public void invalidateDrawable(Drawable drawable) { 9275 if (verifyDrawable(drawable)) { 9276 final Rect dirty = drawable.getBounds(); 9277 final int scrollX = mScrollX; 9278 final int scrollY = mScrollY; 9279 9280 invalidate(dirty.left + scrollX, dirty.top + scrollY, 9281 dirty.right + scrollX, dirty.bottom + scrollY); 9282 } 9283 } 9284 9285 /** 9286 * Schedules an action on a drawable to occur at a specified time. 9287 * 9288 * @param who the recipient of the action 9289 * @param what the action to run on the drawable 9290 * @param when the time at which the action must occur. Uses the 9291 * {@link SystemClock#uptimeMillis} timebase. 9292 */ 9293 public void scheduleDrawable(Drawable who, Runnable what, long when) { 9294 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9295 mAttachInfo.mHandler.postAtTime(what, who, when); 9296 } 9297 } 9298 9299 /** 9300 * Cancels a scheduled action on a drawable. 9301 * 9302 * @param who the recipient of the action 9303 * @param what the action to cancel 9304 */ 9305 public void unscheduleDrawable(Drawable who, Runnable what) { 9306 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9307 mAttachInfo.mHandler.removeCallbacks(what, who); 9308 } 9309 } 9310 9311 /** 9312 * Unschedule any events associated with the given Drawable. This can be 9313 * used when selecting a new Drawable into a view, so that the previous 9314 * one is completely unscheduled. 9315 * 9316 * @param who The Drawable to unschedule. 9317 * 9318 * @see #drawableStateChanged 9319 */ 9320 public void unscheduleDrawable(Drawable who) { 9321 if (mAttachInfo != null) { 9322 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 9323 } 9324 } 9325 9326 /** 9327 * If your view subclass is displaying its own Drawable objects, it should 9328 * override this function and return true for any Drawable it is 9329 * displaying. This allows animations for those drawables to be 9330 * scheduled. 9331 * 9332 * <p>Be sure to call through to the super class when overriding this 9333 * function. 9334 * 9335 * @param who The Drawable to verify. Return true if it is one you are 9336 * displaying, else return the result of calling through to the 9337 * super class. 9338 * 9339 * @return boolean If true than the Drawable is being displayed in the 9340 * view; else false and it is not allowed to animate. 9341 * 9342 * @see #unscheduleDrawable 9343 * @see #drawableStateChanged 9344 */ 9345 protected boolean verifyDrawable(Drawable who) { 9346 return who == mBGDrawable; 9347 } 9348 9349 /** 9350 * This function is called whenever the state of the view changes in such 9351 * a way that it impacts the state of drawables being shown. 9352 * 9353 * <p>Be sure to call through to the superclass when overriding this 9354 * function. 9355 * 9356 * @see Drawable#setState 9357 */ 9358 protected void drawableStateChanged() { 9359 Drawable d = mBGDrawable; 9360 if (d != null && d.isStateful()) { 9361 d.setState(getDrawableState()); 9362 } 9363 } 9364 9365 /** 9366 * Call this to force a view to update its drawable state. This will cause 9367 * drawableStateChanged to be called on this view. Views that are interested 9368 * in the new state should call getDrawableState. 9369 * 9370 * @see #drawableStateChanged 9371 * @see #getDrawableState 9372 */ 9373 public void refreshDrawableState() { 9374 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9375 drawableStateChanged(); 9376 9377 ViewParent parent = mParent; 9378 if (parent != null) { 9379 parent.childDrawableStateChanged(this); 9380 } 9381 } 9382 9383 /** 9384 * Return an array of resource IDs of the drawable states representing the 9385 * current state of the view. 9386 * 9387 * @return The current drawable state 9388 * 9389 * @see Drawable#setState 9390 * @see #drawableStateChanged 9391 * @see #onCreateDrawableState 9392 */ 9393 public final int[] getDrawableState() { 9394 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 9395 return mDrawableState; 9396 } else { 9397 mDrawableState = onCreateDrawableState(0); 9398 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 9399 return mDrawableState; 9400 } 9401 } 9402 9403 /** 9404 * Generate the new {@link android.graphics.drawable.Drawable} state for 9405 * this view. This is called by the view 9406 * system when the cached Drawable state is determined to be invalid. To 9407 * retrieve the current state, you should use {@link #getDrawableState}. 9408 * 9409 * @param extraSpace if non-zero, this is the number of extra entries you 9410 * would like in the returned array in which you can place your own 9411 * states. 9412 * 9413 * @return Returns an array holding the current {@link Drawable} state of 9414 * the view. 9415 * 9416 * @see #mergeDrawableStates 9417 */ 9418 protected int[] onCreateDrawableState(int extraSpace) { 9419 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 9420 mParent instanceof View) { 9421 return ((View) mParent).onCreateDrawableState(extraSpace); 9422 } 9423 9424 int[] drawableState; 9425 9426 int privateFlags = mPrivateFlags; 9427 9428 int viewStateIndex = 0; 9429 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 9430 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 9431 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 9432 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 9433 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 9434 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 9435 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested) { 9436 // This is set if HW acceleration is requested, even if the current 9437 // process doesn't allow it. This is just to allow app preview 9438 // windows to better match their app. 9439 viewStateIndex |= VIEW_STATE_ACCELERATED; 9440 } 9441 9442 drawableState = VIEW_STATE_SETS[viewStateIndex]; 9443 9444 //noinspection ConstantIfStatement 9445 if (false) { 9446 Log.i("View", "drawableStateIndex=" + viewStateIndex); 9447 Log.i("View", toString() 9448 + " pressed=" + ((privateFlags & PRESSED) != 0) 9449 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 9450 + " fo=" + hasFocus() 9451 + " sl=" + ((privateFlags & SELECTED) != 0) 9452 + " wf=" + hasWindowFocus() 9453 + ": " + Arrays.toString(drawableState)); 9454 } 9455 9456 if (extraSpace == 0) { 9457 return drawableState; 9458 } 9459 9460 final int[] fullState; 9461 if (drawableState != null) { 9462 fullState = new int[drawableState.length + extraSpace]; 9463 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 9464 } else { 9465 fullState = new int[extraSpace]; 9466 } 9467 9468 return fullState; 9469 } 9470 9471 /** 9472 * Merge your own state values in <var>additionalState</var> into the base 9473 * state values <var>baseState</var> that were returned by 9474 * {@link #onCreateDrawableState}. 9475 * 9476 * @param baseState The base state values returned by 9477 * {@link #onCreateDrawableState}, which will be modified to also hold your 9478 * own additional state values. 9479 * 9480 * @param additionalState The additional state values you would like 9481 * added to <var>baseState</var>; this array is not modified. 9482 * 9483 * @return As a convenience, the <var>baseState</var> array you originally 9484 * passed into the function is returned. 9485 * 9486 * @see #onCreateDrawableState 9487 */ 9488 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 9489 final int N = baseState.length; 9490 int i = N - 1; 9491 while (i >= 0 && baseState[i] == 0) { 9492 i--; 9493 } 9494 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 9495 return baseState; 9496 } 9497 9498 /** 9499 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 9500 * on all Drawable objects associated with this view. 9501 */ 9502 public void jumpDrawablesToCurrentState() { 9503 if (mBGDrawable != null) { 9504 mBGDrawable.jumpToCurrentState(); 9505 } 9506 } 9507 9508 /** 9509 * Sets the background color for this view. 9510 * @param color the color of the background 9511 */ 9512 @RemotableViewMethod 9513 public void setBackgroundColor(int color) { 9514 if (mBGDrawable instanceof ColorDrawable) { 9515 ((ColorDrawable) mBGDrawable).setColor(color); 9516 } else { 9517 setBackgroundDrawable(new ColorDrawable(color)); 9518 } 9519 } 9520 9521 /** 9522 * Set the background to a given resource. The resource should refer to 9523 * a Drawable object or 0 to remove the background. 9524 * @param resid The identifier of the resource. 9525 * @attr ref android.R.styleable#View_background 9526 */ 9527 @RemotableViewMethod 9528 public void setBackgroundResource(int resid) { 9529 if (resid != 0 && resid == mBackgroundResource) { 9530 return; 9531 } 9532 9533 Drawable d= null; 9534 if (resid != 0) { 9535 d = mResources.getDrawable(resid); 9536 } 9537 setBackgroundDrawable(d); 9538 9539 mBackgroundResource = resid; 9540 } 9541 9542 /** 9543 * Set the background to a given Drawable, or remove the background. If the 9544 * background has padding, this View's padding is set to the background's 9545 * padding. However, when a background is removed, this View's padding isn't 9546 * touched. If setting the padding is desired, please use 9547 * {@link #setPadding(int, int, int, int)}. 9548 * 9549 * @param d The Drawable to use as the background, or null to remove the 9550 * background 9551 */ 9552 public void setBackgroundDrawable(Drawable d) { 9553 boolean requestLayout = false; 9554 9555 mBackgroundResource = 0; 9556 9557 /* 9558 * Regardless of whether we're setting a new background or not, we want 9559 * to clear the previous drawable. 9560 */ 9561 if (mBGDrawable != null) { 9562 mBGDrawable.setCallback(null); 9563 unscheduleDrawable(mBGDrawable); 9564 } 9565 9566 if (d != null) { 9567 Rect padding = sThreadLocal.get(); 9568 if (padding == null) { 9569 padding = new Rect(); 9570 sThreadLocal.set(padding); 9571 } 9572 if (d.getPadding(padding)) { 9573 setPadding(padding.left, padding.top, padding.right, padding.bottom); 9574 } 9575 9576 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 9577 // if it has a different minimum size, we should layout again 9578 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 9579 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 9580 requestLayout = true; 9581 } 9582 9583 d.setCallback(this); 9584 if (d.isStateful()) { 9585 d.setState(getDrawableState()); 9586 } 9587 d.setVisible(getVisibility() == VISIBLE, false); 9588 mBGDrawable = d; 9589 9590 if ((mPrivateFlags & SKIP_DRAW) != 0) { 9591 mPrivateFlags &= ~SKIP_DRAW; 9592 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 9593 requestLayout = true; 9594 } 9595 } else { 9596 /* Remove the background */ 9597 mBGDrawable = null; 9598 9599 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 9600 /* 9601 * This view ONLY drew the background before and we're removing 9602 * the background, so now it won't draw anything 9603 * (hence we SKIP_DRAW) 9604 */ 9605 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 9606 mPrivateFlags |= SKIP_DRAW; 9607 } 9608 9609 /* 9610 * When the background is set, we try to apply its padding to this 9611 * View. When the background is removed, we don't touch this View's 9612 * padding. This is noted in the Javadocs. Hence, we don't need to 9613 * requestLayout(), the invalidate() below is sufficient. 9614 */ 9615 9616 // The old background's minimum size could have affected this 9617 // View's layout, so let's requestLayout 9618 requestLayout = true; 9619 } 9620 9621 computeOpaqueFlags(); 9622 9623 if (requestLayout) { 9624 requestLayout(); 9625 } 9626 9627 mBackgroundSizeChanged = true; 9628 invalidate(); 9629 } 9630 9631 /** 9632 * Gets the background drawable 9633 * @return The drawable used as the background for this view, if any. 9634 */ 9635 public Drawable getBackground() { 9636 return mBGDrawable; 9637 } 9638 9639 /** 9640 * Sets the padding. The view may add on the space required to display 9641 * the scrollbars, depending on the style and visibility of the scrollbars. 9642 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 9643 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 9644 * from the values set in this call. 9645 * 9646 * @attr ref android.R.styleable#View_padding 9647 * @attr ref android.R.styleable#View_paddingBottom 9648 * @attr ref android.R.styleable#View_paddingLeft 9649 * @attr ref android.R.styleable#View_paddingRight 9650 * @attr ref android.R.styleable#View_paddingTop 9651 * @param left the left padding in pixels 9652 * @param top the top padding in pixels 9653 * @param right the right padding in pixels 9654 * @param bottom the bottom padding in pixels 9655 */ 9656 public void setPadding(int left, int top, int right, int bottom) { 9657 boolean changed = false; 9658 9659 mUserPaddingLeft = left; 9660 mUserPaddingRight = right; 9661 mUserPaddingBottom = bottom; 9662 9663 final int viewFlags = mViewFlags; 9664 9665 // Common case is there are no scroll bars. 9666 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 9667 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 9668 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 9669 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 9670 ? 0 : getVerticalScrollbarWidth(); 9671 switch (mVerticalScrollbarPosition) { 9672 case SCROLLBAR_POSITION_DEFAULT: 9673 case SCROLLBAR_POSITION_RIGHT: 9674 right += offset; 9675 break; 9676 case SCROLLBAR_POSITION_LEFT: 9677 left += offset; 9678 break; 9679 } 9680 } 9681 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 9682 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 9683 ? 0 : getHorizontalScrollbarHeight(); 9684 } 9685 } 9686 9687 if (mPaddingLeft != left) { 9688 changed = true; 9689 mPaddingLeft = left; 9690 } 9691 if (mPaddingTop != top) { 9692 changed = true; 9693 mPaddingTop = top; 9694 } 9695 if (mPaddingRight != right) { 9696 changed = true; 9697 mPaddingRight = right; 9698 } 9699 if (mPaddingBottom != bottom) { 9700 changed = true; 9701 mPaddingBottom = bottom; 9702 } 9703 9704 if (changed) { 9705 requestLayout(); 9706 } 9707 } 9708 9709 /** 9710 * Returns the top padding of this view. 9711 * 9712 * @return the top padding in pixels 9713 */ 9714 public int getPaddingTop() { 9715 return mPaddingTop; 9716 } 9717 9718 /** 9719 * Returns the bottom padding of this view. If there are inset and enabled 9720 * scrollbars, this value may include the space required to display the 9721 * scrollbars as well. 9722 * 9723 * @return the bottom padding in pixels 9724 */ 9725 public int getPaddingBottom() { 9726 return mPaddingBottom; 9727 } 9728 9729 /** 9730 * Returns the left padding of this view. If there are inset and enabled 9731 * scrollbars, this value may include the space required to display the 9732 * scrollbars as well. 9733 * 9734 * @return the left padding in pixels 9735 */ 9736 public int getPaddingLeft() { 9737 return mPaddingLeft; 9738 } 9739 9740 /** 9741 * Returns the right padding of this view. If there are inset and enabled 9742 * scrollbars, this value may include the space required to display the 9743 * scrollbars as well. 9744 * 9745 * @return the right padding in pixels 9746 */ 9747 public int getPaddingRight() { 9748 return mPaddingRight; 9749 } 9750 9751 /** 9752 * Changes the selection state of this view. A view can be selected or not. 9753 * Note that selection is not the same as focus. Views are typically 9754 * selected in the context of an AdapterView like ListView or GridView; 9755 * the selected view is the view that is highlighted. 9756 * 9757 * @param selected true if the view must be selected, false otherwise 9758 */ 9759 public void setSelected(boolean selected) { 9760 if (((mPrivateFlags & SELECTED) != 0) != selected) { 9761 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 9762 if (!selected) resetPressedState(); 9763 invalidate(); 9764 refreshDrawableState(); 9765 dispatchSetSelected(selected); 9766 } 9767 } 9768 9769 /** 9770 * Dispatch setSelected to all of this View's children. 9771 * 9772 * @see #setSelected(boolean) 9773 * 9774 * @param selected The new selected state 9775 */ 9776 protected void dispatchSetSelected(boolean selected) { 9777 } 9778 9779 /** 9780 * Indicates the selection state of this view. 9781 * 9782 * @return true if the view is selected, false otherwise 9783 */ 9784 @ViewDebug.ExportedProperty 9785 public boolean isSelected() { 9786 return (mPrivateFlags & SELECTED) != 0; 9787 } 9788 9789 /** 9790 * Changes the activated state of this view. A view can be activated or not. 9791 * Note that activation is not the same as selection. Selection is 9792 * a transient property, representing the view (hierarchy) the user is 9793 * currently interacting with. Activation is a longer-term state that the 9794 * user can move views in and out of. For example, in a list view with 9795 * single or multiple selection enabled, the views in the current selection 9796 * set are activated. (Um, yeah, we are deeply sorry about the terminology 9797 * here.) The activated state is propagated down to children of the view it 9798 * is set on. 9799 * 9800 * @param activated true if the view must be activated, false otherwise 9801 */ 9802 public void setActivated(boolean activated) { 9803 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 9804 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 9805 invalidate(); 9806 refreshDrawableState(); 9807 dispatchSetActivated(activated); 9808 } 9809 } 9810 9811 /** 9812 * Dispatch setActivated to all of this View's children. 9813 * 9814 * @see #setActivated(boolean) 9815 * 9816 * @param activated The new activated state 9817 */ 9818 protected void dispatchSetActivated(boolean activated) { 9819 } 9820 9821 /** 9822 * Indicates the activation state of this view. 9823 * 9824 * @return true if the view is activated, false otherwise 9825 */ 9826 @ViewDebug.ExportedProperty 9827 public boolean isActivated() { 9828 return (mPrivateFlags & ACTIVATED) != 0; 9829 } 9830 9831 /** 9832 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 9833 * observer can be used to get notifications when global events, like 9834 * layout, happen. 9835 * 9836 * The returned ViewTreeObserver observer is not guaranteed to remain 9837 * valid for the lifetime of this View. If the caller of this method keeps 9838 * a long-lived reference to ViewTreeObserver, it should always check for 9839 * the return value of {@link ViewTreeObserver#isAlive()}. 9840 * 9841 * @return The ViewTreeObserver for this view's hierarchy. 9842 */ 9843 public ViewTreeObserver getViewTreeObserver() { 9844 if (mAttachInfo != null) { 9845 return mAttachInfo.mTreeObserver; 9846 } 9847 if (mFloatingTreeObserver == null) { 9848 mFloatingTreeObserver = new ViewTreeObserver(); 9849 } 9850 return mFloatingTreeObserver; 9851 } 9852 9853 /** 9854 * <p>Finds the topmost view in the current view hierarchy.</p> 9855 * 9856 * @return the topmost view containing this view 9857 */ 9858 public View getRootView() { 9859 if (mAttachInfo != null) { 9860 final View v = mAttachInfo.mRootView; 9861 if (v != null) { 9862 return v; 9863 } 9864 } 9865 9866 View parent = this; 9867 9868 while (parent.mParent != null && parent.mParent instanceof View) { 9869 parent = (View) parent.mParent; 9870 } 9871 9872 return parent; 9873 } 9874 9875 /** 9876 * <p>Computes the coordinates of this view on the screen. The argument 9877 * must be an array of two integers. After the method returns, the array 9878 * contains the x and y location in that order.</p> 9879 * 9880 * @param location an array of two integers in which to hold the coordinates 9881 */ 9882 public void getLocationOnScreen(int[] location) { 9883 getLocationInWindow(location); 9884 9885 final AttachInfo info = mAttachInfo; 9886 if (info != null) { 9887 location[0] += info.mWindowLeft; 9888 location[1] += info.mWindowTop; 9889 } 9890 } 9891 9892 /** 9893 * <p>Computes the coordinates of this view in its window. The argument 9894 * must be an array of two integers. After the method returns, the array 9895 * contains the x and y location in that order.</p> 9896 * 9897 * @param location an array of two integers in which to hold the coordinates 9898 */ 9899 public void getLocationInWindow(int[] location) { 9900 if (location == null || location.length < 2) { 9901 throw new IllegalArgumentException("location must be an array of " 9902 + "two integers"); 9903 } 9904 9905 location[0] = mLeft + (int) (mTranslationX + 0.5f); 9906 location[1] = mTop + (int) (mTranslationY + 0.5f); 9907 9908 ViewParent viewParent = mParent; 9909 while (viewParent instanceof View) { 9910 final View view = (View)viewParent; 9911 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 9912 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 9913 viewParent = view.mParent; 9914 } 9915 9916 if (viewParent instanceof ViewRoot) { 9917 // *cough* 9918 final ViewRoot vr = (ViewRoot)viewParent; 9919 location[1] -= vr.mCurScrollY; 9920 } 9921 } 9922 9923 /** 9924 * {@hide} 9925 * @param id the id of the view to be found 9926 * @return the view of the specified id, null if cannot be found 9927 */ 9928 protected View findViewTraversal(int id) { 9929 if (id == mID) { 9930 return this; 9931 } 9932 return null; 9933 } 9934 9935 /** 9936 * {@hide} 9937 * @param tag the tag of the view to be found 9938 * @return the view of specified tag, null if cannot be found 9939 */ 9940 protected View findViewWithTagTraversal(Object tag) { 9941 if (tag != null && tag.equals(mTag)) { 9942 return this; 9943 } 9944 return null; 9945 } 9946 9947 /** 9948 * {@hide} 9949 * @param predicate The predicate to evaluate. 9950 * @return The first view that matches the predicate or null. 9951 */ 9952 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 9953 if (predicate.apply(this)) { 9954 return this; 9955 } 9956 return null; 9957 } 9958 9959 /** 9960 * Look for a child view with the given id. If this view has the given 9961 * id, return this view. 9962 * 9963 * @param id The id to search for. 9964 * @return The view that has the given id in the hierarchy or null 9965 */ 9966 public final View findViewById(int id) { 9967 if (id < 0) { 9968 return null; 9969 } 9970 return findViewTraversal(id); 9971 } 9972 9973 /** 9974 * Look for a child view with the given tag. If this view has the given 9975 * tag, return this view. 9976 * 9977 * @param tag The tag to search for, using "tag.equals(getTag())". 9978 * @return The View that has the given tag in the hierarchy or null 9979 */ 9980 public final View findViewWithTag(Object tag) { 9981 if (tag == null) { 9982 return null; 9983 } 9984 return findViewWithTagTraversal(tag); 9985 } 9986 9987 /** 9988 * {@hide} 9989 * Look for a child view that matches the specified predicate. 9990 * If this view matches the predicate, return this view. 9991 * 9992 * @param predicate The predicate to evaluate. 9993 * @return The first view that matches the predicate or null. 9994 */ 9995 public final View findViewByPredicate(Predicate<View> predicate) { 9996 return findViewByPredicateTraversal(predicate); 9997 } 9998 9999 /** 10000 * Sets the identifier for this view. The identifier does not have to be 10001 * unique in this view's hierarchy. The identifier should be a positive 10002 * number. 10003 * 10004 * @see #NO_ID 10005 * @see #getId 10006 * @see #findViewById 10007 * 10008 * @param id a number used to identify the view 10009 * 10010 * @attr ref android.R.styleable#View_id 10011 */ 10012 public void setId(int id) { 10013 mID = id; 10014 } 10015 10016 /** 10017 * {@hide} 10018 * 10019 * @param isRoot true if the view belongs to the root namespace, false 10020 * otherwise 10021 */ 10022 public void setIsRootNamespace(boolean isRoot) { 10023 if (isRoot) { 10024 mPrivateFlags |= IS_ROOT_NAMESPACE; 10025 } else { 10026 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 10027 } 10028 } 10029 10030 /** 10031 * {@hide} 10032 * 10033 * @return true if the view belongs to the root namespace, false otherwise 10034 */ 10035 public boolean isRootNamespace() { 10036 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 10037 } 10038 10039 /** 10040 * Returns this view's identifier. 10041 * 10042 * @return a positive integer used to identify the view or {@link #NO_ID} 10043 * if the view has no ID 10044 * 10045 * @see #setId 10046 * @see #findViewById 10047 * @attr ref android.R.styleable#View_id 10048 */ 10049 @ViewDebug.CapturedViewProperty 10050 public int getId() { 10051 return mID; 10052 } 10053 10054 /** 10055 * Returns this view's tag. 10056 * 10057 * @return the Object stored in this view as a tag 10058 * 10059 * @see #setTag(Object) 10060 * @see #getTag(int) 10061 */ 10062 @ViewDebug.ExportedProperty 10063 public Object getTag() { 10064 return mTag; 10065 } 10066 10067 /** 10068 * Sets the tag associated with this view. A tag can be used to mark 10069 * a view in its hierarchy and does not have to be unique within the 10070 * hierarchy. Tags can also be used to store data within a view without 10071 * resorting to another data structure. 10072 * 10073 * @param tag an Object to tag the view with 10074 * 10075 * @see #getTag() 10076 * @see #setTag(int, Object) 10077 */ 10078 public void setTag(final Object tag) { 10079 mTag = tag; 10080 } 10081 10082 /** 10083 * Returns the tag associated with this view and the specified key. 10084 * 10085 * @param key The key identifying the tag 10086 * 10087 * @return the Object stored in this view as a tag 10088 * 10089 * @see #setTag(int, Object) 10090 * @see #getTag() 10091 */ 10092 public Object getTag(int key) { 10093 SparseArray<Object> tags = null; 10094 synchronized (sTagsLock) { 10095 if (sTags != null) { 10096 tags = sTags.get(this); 10097 } 10098 } 10099 10100 if (tags != null) return tags.get(key); 10101 return null; 10102 } 10103 10104 /** 10105 * Sets a tag associated with this view and a key. A tag can be used 10106 * to mark a view in its hierarchy and does not have to be unique within 10107 * the hierarchy. Tags can also be used to store data within a view 10108 * without resorting to another data structure. 10109 * 10110 * The specified key should be an id declared in the resources of the 10111 * application to ensure it is unique (see the <a 10112 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 10113 * Keys identified as belonging to 10114 * the Android framework or not associated with any package will cause 10115 * an {@link IllegalArgumentException} to be thrown. 10116 * 10117 * @param key The key identifying the tag 10118 * @param tag An Object to tag the view with 10119 * 10120 * @throws IllegalArgumentException If they specified key is not valid 10121 * 10122 * @see #setTag(Object) 10123 * @see #getTag(int) 10124 */ 10125 public void setTag(int key, final Object tag) { 10126 // If the package id is 0x00 or 0x01, it's either an undefined package 10127 // or a framework id 10128 if ((key >>> 24) < 2) { 10129 throw new IllegalArgumentException("The key must be an application-specific " 10130 + "resource id."); 10131 } 10132 10133 setTagInternal(this, key, tag); 10134 } 10135 10136 /** 10137 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 10138 * framework id. 10139 * 10140 * @hide 10141 */ 10142 public void setTagInternal(int key, Object tag) { 10143 if ((key >>> 24) != 0x1) { 10144 throw new IllegalArgumentException("The key must be a framework-specific " 10145 + "resource id."); 10146 } 10147 10148 setTagInternal(this, key, tag); 10149 } 10150 10151 private static void setTagInternal(View view, int key, Object tag) { 10152 SparseArray<Object> tags = null; 10153 synchronized (sTagsLock) { 10154 if (sTags == null) { 10155 sTags = new WeakHashMap<View, SparseArray<Object>>(); 10156 } else { 10157 tags = sTags.get(view); 10158 } 10159 } 10160 10161 if (tags == null) { 10162 tags = new SparseArray<Object>(2); 10163 synchronized (sTagsLock) { 10164 sTags.put(view, tags); 10165 } 10166 } 10167 10168 tags.put(key, tag); 10169 } 10170 10171 /** 10172 * @param consistency The type of consistency. See ViewDebug for more information. 10173 * 10174 * @hide 10175 */ 10176 protected boolean dispatchConsistencyCheck(int consistency) { 10177 return onConsistencyCheck(consistency); 10178 } 10179 10180 /** 10181 * Method that subclasses should implement to check their consistency. The type of 10182 * consistency check is indicated by the bit field passed as a parameter. 10183 * 10184 * @param consistency The type of consistency. See ViewDebug for more information. 10185 * 10186 * @throws IllegalStateException if the view is in an inconsistent state. 10187 * 10188 * @hide 10189 */ 10190 protected boolean onConsistencyCheck(int consistency) { 10191 boolean result = true; 10192 10193 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 10194 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 10195 10196 if (checkLayout) { 10197 if (getParent() == null) { 10198 result = false; 10199 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10200 "View " + this + " does not have a parent."); 10201 } 10202 10203 if (mAttachInfo == null) { 10204 result = false; 10205 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10206 "View " + this + " is not attached to a window."); 10207 } 10208 } 10209 10210 if (checkDrawing) { 10211 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 10212 // from their draw() method 10213 10214 if ((mPrivateFlags & DRAWN) != DRAWN && 10215 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 10216 result = false; 10217 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10218 "View " + this + " was invalidated but its drawing cache is valid."); 10219 } 10220 } 10221 10222 return result; 10223 } 10224 10225 /** 10226 * Prints information about this view in the log output, with the tag 10227 * {@link #VIEW_LOG_TAG}. 10228 * 10229 * @hide 10230 */ 10231 public void debug() { 10232 debug(0); 10233 } 10234 10235 /** 10236 * Prints information about this view in the log output, with the tag 10237 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 10238 * indentation defined by the <code>depth</code>. 10239 * 10240 * @param depth the indentation level 10241 * 10242 * @hide 10243 */ 10244 protected void debug(int depth) { 10245 String output = debugIndent(depth - 1); 10246 10247 output += "+ " + this; 10248 int id = getId(); 10249 if (id != -1) { 10250 output += " (id=" + id + ")"; 10251 } 10252 Object tag = getTag(); 10253 if (tag != null) { 10254 output += " (tag=" + tag + ")"; 10255 } 10256 Log.d(VIEW_LOG_TAG, output); 10257 10258 if ((mPrivateFlags & FOCUSED) != 0) { 10259 output = debugIndent(depth) + " FOCUSED"; 10260 Log.d(VIEW_LOG_TAG, output); 10261 } 10262 10263 output = debugIndent(depth); 10264 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 10265 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 10266 + "} "; 10267 Log.d(VIEW_LOG_TAG, output); 10268 10269 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 10270 || mPaddingBottom != 0) { 10271 output = debugIndent(depth); 10272 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 10273 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 10274 Log.d(VIEW_LOG_TAG, output); 10275 } 10276 10277 output = debugIndent(depth); 10278 output += "mMeasureWidth=" + mMeasuredWidth + 10279 " mMeasureHeight=" + mMeasuredHeight; 10280 Log.d(VIEW_LOG_TAG, output); 10281 10282 output = debugIndent(depth); 10283 if (mLayoutParams == null) { 10284 output += "BAD! no layout params"; 10285 } else { 10286 output = mLayoutParams.debug(output); 10287 } 10288 Log.d(VIEW_LOG_TAG, output); 10289 10290 output = debugIndent(depth); 10291 output += "flags={"; 10292 output += View.printFlags(mViewFlags); 10293 output += "}"; 10294 Log.d(VIEW_LOG_TAG, output); 10295 10296 output = debugIndent(depth); 10297 output += "privateFlags={"; 10298 output += View.printPrivateFlags(mPrivateFlags); 10299 output += "}"; 10300 Log.d(VIEW_LOG_TAG, output); 10301 } 10302 10303 /** 10304 * Creates an string of whitespaces used for indentation. 10305 * 10306 * @param depth the indentation level 10307 * @return a String containing (depth * 2 + 3) * 2 white spaces 10308 * 10309 * @hide 10310 */ 10311 protected static String debugIndent(int depth) { 10312 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 10313 for (int i = 0; i < (depth * 2) + 3; i++) { 10314 spaces.append(' ').append(' '); 10315 } 10316 return spaces.toString(); 10317 } 10318 10319 /** 10320 * <p>Return the offset of the widget's text baseline from the widget's top 10321 * boundary. If this widget does not support baseline alignment, this 10322 * method returns -1. </p> 10323 * 10324 * @return the offset of the baseline within the widget's bounds or -1 10325 * if baseline alignment is not supported 10326 */ 10327 @ViewDebug.ExportedProperty(category = "layout") 10328 public int getBaseline() { 10329 return -1; 10330 } 10331 10332 /** 10333 * Call this when something has changed which has invalidated the 10334 * layout of this view. This will schedule a layout pass of the view 10335 * tree. 10336 */ 10337 public void requestLayout() { 10338 if (ViewDebug.TRACE_HIERARCHY) { 10339 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 10340 } 10341 10342 mPrivateFlags |= FORCE_LAYOUT; 10343 mPrivateFlags |= INVALIDATED; 10344 10345 if (mParent != null && !mParent.isLayoutRequested()) { 10346 mParent.requestLayout(); 10347 } 10348 } 10349 10350 /** 10351 * Forces this view to be laid out during the next layout pass. 10352 * This method does not call requestLayout() or forceLayout() 10353 * on the parent. 10354 */ 10355 public void forceLayout() { 10356 mPrivateFlags |= FORCE_LAYOUT; 10357 mPrivateFlags |= INVALIDATED; 10358 } 10359 10360 /** 10361 * <p> 10362 * This is called to find out how big a view should be. The parent 10363 * supplies constraint information in the width and height parameters. 10364 * </p> 10365 * 10366 * <p> 10367 * The actual mesurement work of a view is performed in 10368 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 10369 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 10370 * </p> 10371 * 10372 * 10373 * @param widthMeasureSpec Horizontal space requirements as imposed by the 10374 * parent 10375 * @param heightMeasureSpec Vertical space requirements as imposed by the 10376 * parent 10377 * 10378 * @see #onMeasure(int, int) 10379 */ 10380 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 10381 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 10382 widthMeasureSpec != mOldWidthMeasureSpec || 10383 heightMeasureSpec != mOldHeightMeasureSpec) { 10384 10385 // first clears the measured dimension flag 10386 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 10387 10388 if (ViewDebug.TRACE_HIERARCHY) { 10389 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 10390 } 10391 10392 // measure ourselves, this should set the measured dimension flag back 10393 onMeasure(widthMeasureSpec, heightMeasureSpec); 10394 10395 // flag not set, setMeasuredDimension() was not invoked, we raise 10396 // an exception to warn the developer 10397 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 10398 throw new IllegalStateException("onMeasure() did not set the" 10399 + " measured dimension by calling" 10400 + " setMeasuredDimension()"); 10401 } 10402 10403 mPrivateFlags |= LAYOUT_REQUIRED; 10404 } 10405 10406 mOldWidthMeasureSpec = widthMeasureSpec; 10407 mOldHeightMeasureSpec = heightMeasureSpec; 10408 } 10409 10410 /** 10411 * <p> 10412 * Measure the view and its content to determine the measured width and the 10413 * measured height. This method is invoked by {@link #measure(int, int)} and 10414 * should be overriden by subclasses to provide accurate and efficient 10415 * measurement of their contents. 10416 * </p> 10417 * 10418 * <p> 10419 * <strong>CONTRACT:</strong> When overriding this method, you 10420 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 10421 * measured width and height of this view. Failure to do so will trigger an 10422 * <code>IllegalStateException</code>, thrown by 10423 * {@link #measure(int, int)}. Calling the superclass' 10424 * {@link #onMeasure(int, int)} is a valid use. 10425 * </p> 10426 * 10427 * <p> 10428 * The base class implementation of measure defaults to the background size, 10429 * unless a larger size is allowed by the MeasureSpec. Subclasses should 10430 * override {@link #onMeasure(int, int)} to provide better measurements of 10431 * their content. 10432 * </p> 10433 * 10434 * <p> 10435 * If this method is overridden, it is the subclass's responsibility to make 10436 * sure the measured height and width are at least the view's minimum height 10437 * and width ({@link #getSuggestedMinimumHeight()} and 10438 * {@link #getSuggestedMinimumWidth()}). 10439 * </p> 10440 * 10441 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 10442 * The requirements are encoded with 10443 * {@link android.view.View.MeasureSpec}. 10444 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 10445 * The requirements are encoded with 10446 * {@link android.view.View.MeasureSpec}. 10447 * 10448 * @see #getMeasuredWidth() 10449 * @see #getMeasuredHeight() 10450 * @see #setMeasuredDimension(int, int) 10451 * @see #getSuggestedMinimumHeight() 10452 * @see #getSuggestedMinimumWidth() 10453 * @see android.view.View.MeasureSpec#getMode(int) 10454 * @see android.view.View.MeasureSpec#getSize(int) 10455 */ 10456 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 10457 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 10458 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 10459 } 10460 10461 /** 10462 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 10463 * measured width and measured height. Failing to do so will trigger an 10464 * exception at measurement time.</p> 10465 * 10466 * @param measuredWidth The measured width of this view. May be a complex 10467 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10468 * {@link #MEASURED_STATE_TOO_SMALL}. 10469 * @param measuredHeight The measured height of this view. May be a complex 10470 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10471 * {@link #MEASURED_STATE_TOO_SMALL}. 10472 */ 10473 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 10474 mMeasuredWidth = measuredWidth; 10475 mMeasuredHeight = measuredHeight; 10476 10477 mPrivateFlags |= MEASURED_DIMENSION_SET; 10478 } 10479 10480 /** 10481 * Merge two states as returned by {@link #getMeasuredState()}. 10482 * @param curState The current state as returned from a view or the result 10483 * of combining multiple views. 10484 * @param newState The new view state to combine. 10485 * @return Returns a new integer reflecting the combination of the two 10486 * states. 10487 */ 10488 public static int combineMeasuredStates(int curState, int newState) { 10489 return curState | newState; 10490 } 10491 10492 /** 10493 * Version of {@link #resolveSizeAndState(int, int, int)} 10494 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 10495 */ 10496 public static int resolveSize(int size, int measureSpec) { 10497 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 10498 } 10499 10500 /** 10501 * Utility to reconcile a desired size and state, with constraints imposed 10502 * by a MeasureSpec. Will take the desired size, unless a different size 10503 * is imposed by the constraints. The returned value is a compound integer, 10504 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 10505 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 10506 * size is smaller than the size the view wants to be. 10507 * 10508 * @param size How big the view wants to be 10509 * @param measureSpec Constraints imposed by the parent 10510 * @return Size information bit mask as defined by 10511 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 10512 */ 10513 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 10514 int result = size; 10515 int specMode = MeasureSpec.getMode(measureSpec); 10516 int specSize = MeasureSpec.getSize(measureSpec); 10517 switch (specMode) { 10518 case MeasureSpec.UNSPECIFIED: 10519 result = size; 10520 break; 10521 case MeasureSpec.AT_MOST: 10522 if (specSize < size) { 10523 result = specSize | MEASURED_STATE_TOO_SMALL; 10524 } else { 10525 result = size; 10526 } 10527 break; 10528 case MeasureSpec.EXACTLY: 10529 result = specSize; 10530 break; 10531 } 10532 return result | (childMeasuredState&MEASURED_STATE_MASK); 10533 } 10534 10535 /** 10536 * Utility to return a default size. Uses the supplied size if the 10537 * MeasureSpec imposed no contraints. Will get larger if allowed 10538 * by the MeasureSpec. 10539 * 10540 * @param size Default size for this view 10541 * @param measureSpec Constraints imposed by the parent 10542 * @return The size this view should be. 10543 */ 10544 public static int getDefaultSize(int size, int measureSpec) { 10545 int result = size; 10546 int specMode = MeasureSpec.getMode(measureSpec); 10547 int specSize = MeasureSpec.getSize(measureSpec); 10548 10549 switch (specMode) { 10550 case MeasureSpec.UNSPECIFIED: 10551 result = size; 10552 break; 10553 case MeasureSpec.AT_MOST: 10554 case MeasureSpec.EXACTLY: 10555 result = specSize; 10556 break; 10557 } 10558 return result; 10559 } 10560 10561 /** 10562 * Returns the suggested minimum height that the view should use. This 10563 * returns the maximum of the view's minimum height 10564 * and the background's minimum height 10565 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 10566 * <p> 10567 * When being used in {@link #onMeasure(int, int)}, the caller should still 10568 * ensure the returned height is within the requirements of the parent. 10569 * 10570 * @return The suggested minimum height of the view. 10571 */ 10572 protected int getSuggestedMinimumHeight() { 10573 int suggestedMinHeight = mMinHeight; 10574 10575 if (mBGDrawable != null) { 10576 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 10577 if (suggestedMinHeight < bgMinHeight) { 10578 suggestedMinHeight = bgMinHeight; 10579 } 10580 } 10581 10582 return suggestedMinHeight; 10583 } 10584 10585 /** 10586 * Returns the suggested minimum width that the view should use. This 10587 * returns the maximum of the view's minimum width) 10588 * and the background's minimum width 10589 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 10590 * <p> 10591 * When being used in {@link #onMeasure(int, int)}, the caller should still 10592 * ensure the returned width is within the requirements of the parent. 10593 * 10594 * @return The suggested minimum width of the view. 10595 */ 10596 protected int getSuggestedMinimumWidth() { 10597 int suggestedMinWidth = mMinWidth; 10598 10599 if (mBGDrawable != null) { 10600 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 10601 if (suggestedMinWidth < bgMinWidth) { 10602 suggestedMinWidth = bgMinWidth; 10603 } 10604 } 10605 10606 return suggestedMinWidth; 10607 } 10608 10609 /** 10610 * Sets the minimum height of the view. It is not guaranteed the view will 10611 * be able to achieve this minimum height (for example, if its parent layout 10612 * constrains it with less available height). 10613 * 10614 * @param minHeight The minimum height the view will try to be. 10615 */ 10616 public void setMinimumHeight(int minHeight) { 10617 mMinHeight = minHeight; 10618 } 10619 10620 /** 10621 * Sets the minimum width of the view. It is not guaranteed the view will 10622 * be able to achieve this minimum width (for example, if its parent layout 10623 * constrains it with less available width). 10624 * 10625 * @param minWidth The minimum width the view will try to be. 10626 */ 10627 public void setMinimumWidth(int minWidth) { 10628 mMinWidth = minWidth; 10629 } 10630 10631 /** 10632 * Get the animation currently associated with this view. 10633 * 10634 * @return The animation that is currently playing or 10635 * scheduled to play for this view. 10636 */ 10637 public Animation getAnimation() { 10638 return mCurrentAnimation; 10639 } 10640 10641 /** 10642 * Start the specified animation now. 10643 * 10644 * @param animation the animation to start now 10645 */ 10646 public void startAnimation(Animation animation) { 10647 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 10648 setAnimation(animation); 10649 invalidate(); 10650 invalidateParentIfAccelerated(); 10651 } 10652 10653 /** 10654 * Cancels any animations for this view. 10655 */ 10656 public void clearAnimation() { 10657 if (mCurrentAnimation != null) { 10658 mCurrentAnimation.detach(); 10659 } 10660 mCurrentAnimation = null; 10661 invalidateParentIfAccelerated(); 10662 } 10663 10664 /** 10665 * Sets the next animation to play for this view. 10666 * If you want the animation to play immediately, use 10667 * startAnimation. This method provides allows fine-grained 10668 * control over the start time and invalidation, but you 10669 * must make sure that 1) the animation has a start time set, and 10670 * 2) the view will be invalidated when the animation is supposed to 10671 * start. 10672 * 10673 * @param animation The next animation, or null. 10674 */ 10675 public void setAnimation(Animation animation) { 10676 mCurrentAnimation = animation; 10677 if (animation != null) { 10678 animation.reset(); 10679 } 10680 } 10681 10682 /** 10683 * Invoked by a parent ViewGroup to notify the start of the animation 10684 * currently associated with this view. If you override this method, 10685 * always call super.onAnimationStart(); 10686 * 10687 * @see #setAnimation(android.view.animation.Animation) 10688 * @see #getAnimation() 10689 */ 10690 protected void onAnimationStart() { 10691 mPrivateFlags |= ANIMATION_STARTED; 10692 } 10693 10694 /** 10695 * Invoked by a parent ViewGroup to notify the end of the animation 10696 * currently associated with this view. If you override this method, 10697 * always call super.onAnimationEnd(); 10698 * 10699 * @see #setAnimation(android.view.animation.Animation) 10700 * @see #getAnimation() 10701 */ 10702 protected void onAnimationEnd() { 10703 mPrivateFlags &= ~ANIMATION_STARTED; 10704 } 10705 10706 /** 10707 * Invoked if there is a Transform that involves alpha. Subclass that can 10708 * draw themselves with the specified alpha should return true, and then 10709 * respect that alpha when their onDraw() is called. If this returns false 10710 * then the view may be redirected to draw into an offscreen buffer to 10711 * fulfill the request, which will look fine, but may be slower than if the 10712 * subclass handles it internally. The default implementation returns false. 10713 * 10714 * @param alpha The alpha (0..255) to apply to the view's drawing 10715 * @return true if the view can draw with the specified alpha. 10716 */ 10717 protected boolean onSetAlpha(int alpha) { 10718 return false; 10719 } 10720 10721 /** 10722 * This is used by the RootView to perform an optimization when 10723 * the view hierarchy contains one or several SurfaceView. 10724 * SurfaceView is always considered transparent, but its children are not, 10725 * therefore all View objects remove themselves from the global transparent 10726 * region (passed as a parameter to this function). 10727 * 10728 * @param region The transparent region for this ViewRoot (window). 10729 * 10730 * @return Returns true if the effective visibility of the view at this 10731 * point is opaque, regardless of the transparent region; returns false 10732 * if it is possible for underlying windows to be seen behind the view. 10733 * 10734 * {@hide} 10735 */ 10736 public boolean gatherTransparentRegion(Region region) { 10737 final AttachInfo attachInfo = mAttachInfo; 10738 if (region != null && attachInfo != null) { 10739 final int pflags = mPrivateFlags; 10740 if ((pflags & SKIP_DRAW) == 0) { 10741 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 10742 // remove it from the transparent region. 10743 final int[] location = attachInfo.mTransparentLocation; 10744 getLocationInWindow(location); 10745 region.op(location[0], location[1], location[0] + mRight - mLeft, 10746 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 10747 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 10748 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 10749 // exists, so we remove the background drawable's non-transparent 10750 // parts from this transparent region. 10751 applyDrawableToTransparentRegion(mBGDrawable, region); 10752 } 10753 } 10754 return true; 10755 } 10756 10757 /** 10758 * Play a sound effect for this view. 10759 * 10760 * <p>The framework will play sound effects for some built in actions, such as 10761 * clicking, but you may wish to play these effects in your widget, 10762 * for instance, for internal navigation. 10763 * 10764 * <p>The sound effect will only be played if sound effects are enabled by the user, and 10765 * {@link #isSoundEffectsEnabled()} is true. 10766 * 10767 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 10768 */ 10769 public void playSoundEffect(int soundConstant) { 10770 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 10771 return; 10772 } 10773 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 10774 } 10775 10776 /** 10777 * BZZZTT!!1! 10778 * 10779 * <p>Provide haptic feedback to the user for this view. 10780 * 10781 * <p>The framework will provide haptic feedback for some built in actions, 10782 * such as long presses, but you may wish to provide feedback for your 10783 * own widget. 10784 * 10785 * <p>The feedback will only be performed if 10786 * {@link #isHapticFeedbackEnabled()} is true. 10787 * 10788 * @param feedbackConstant One of the constants defined in 10789 * {@link HapticFeedbackConstants} 10790 */ 10791 public boolean performHapticFeedback(int feedbackConstant) { 10792 return performHapticFeedback(feedbackConstant, 0); 10793 } 10794 10795 /** 10796 * BZZZTT!!1! 10797 * 10798 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 10799 * 10800 * @param feedbackConstant One of the constants defined in 10801 * {@link HapticFeedbackConstants} 10802 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 10803 */ 10804 public boolean performHapticFeedback(int feedbackConstant, int flags) { 10805 if (mAttachInfo == null) { 10806 return false; 10807 } 10808 //noinspection SimplifiableIfStatement 10809 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 10810 && !isHapticFeedbackEnabled()) { 10811 return false; 10812 } 10813 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 10814 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 10815 } 10816 10817 /** 10818 * Request that the visibility of the status bar be changed. 10819 */ 10820 public void setSystemUiVisibility(int visibility) { 10821 if (visibility != mSystemUiVisibility) { 10822 mSystemUiVisibility = visibility; 10823 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 10824 mParent.recomputeViewAttributes(this); 10825 } 10826 } 10827 } 10828 10829 /** 10830 * Returns the status bar visibility that this view has requested. 10831 */ 10832 public int getSystemUiVisibility() { 10833 return mSystemUiVisibility; 10834 } 10835 10836 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 10837 mOnSystemUiVisibilityChangeListener = l; 10838 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 10839 mParent.recomputeViewAttributes(this); 10840 } 10841 } 10842 10843 /** 10844 */ 10845 public void dispatchSystemUiVisibilityChanged(int visibility) { 10846 if (mOnSystemUiVisibilityChangeListener != null) { 10847 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange(visibility); 10848 } 10849 } 10850 10851 /** 10852 * !!! TODO: real docs 10853 * 10854 * The base class implementation makes the shadow the same size and appearance 10855 * as the view itself, and positions it with its center at the touch point. 10856 */ 10857 public static class DragShadowBuilder { 10858 private final WeakReference<View> mView; 10859 10860 /** 10861 * Construct a shadow builder object for use with the given View object. The 10862 * default implementation will construct a drag shadow the same size and 10863 * appearance as the supplied View. 10864 * 10865 * @param view A view within the application's layout whose appearance 10866 * should be replicated as the drag shadow. 10867 */ 10868 public DragShadowBuilder(View view) { 10869 mView = new WeakReference<View>(view); 10870 } 10871 10872 /** 10873 * Construct a shadow builder object with no associated View. This 10874 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 10875 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 10876 * to supply the drag shadow's dimensions and appearance without 10877 * reference to any View object. 10878 */ 10879 public DragShadowBuilder() { 10880 mView = new WeakReference<View>(null); 10881 } 10882 10883 /** 10884 * Returns the View object that had been passed to the 10885 * {@link #View.DragShadowBuilder(View)} 10886 * constructor. If that View parameter was {@code null} or if the 10887 * {@link #View.DragShadowBuilder()} 10888 * constructor was used to instantiate the builder object, this method will return 10889 * null. 10890 * 10891 * @return The View object associate with this builder object. 10892 */ 10893 final public View getView() { 10894 return mView.get(); 10895 } 10896 10897 /** 10898 * Provide the draggable-shadow metrics for the operation: the dimensions of 10899 * the shadow image itself, and the point within that shadow that should 10900 * be centered under the touch location while dragging. 10901 * <p> 10902 * The default implementation sets the dimensions of the shadow to be the 10903 * same as the dimensions of the View object that had been supplied to the 10904 * {@link #View.DragShadowBuilder(View)} constructor 10905 * when the builder object was instantiated, and centers the shadow under the touch 10906 * point. 10907 * 10908 * @param shadowSize The application should set the {@code x} member of this 10909 * parameter to the desired shadow width, and the {@code y} member to 10910 * the desired height. 10911 * @param shadowTouchPoint The application should set this point to be the 10912 * location within the shadow that should track directly underneath 10913 * the touch point on the screen during a drag. 10914 */ 10915 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 10916 final View view = mView.get(); 10917 if (view != null) { 10918 shadowSize.set(view.getWidth(), view.getHeight()); 10919 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 10920 } else { 10921 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 10922 } 10923 } 10924 10925 /** 10926 * Draw the shadow image for the upcoming drag. The shadow canvas was 10927 * created with the dimensions supplied by the 10928 * {@link #onProvideShadowMetrics(Point, Point)} callback. 10929 * <p> 10930 * The default implementation replicates the appearance of the View object 10931 * that had been supplied to the 10932 * {@link #View.DragShadowBuilder(View)} 10933 * constructor when the builder object was instantiated. 10934 * 10935 * @param canvas 10936 */ 10937 public void onDrawShadow(Canvas canvas) { 10938 final View view = mView.get(); 10939 if (view != null) { 10940 view.draw(canvas); 10941 } else { 10942 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 10943 } 10944 } 10945 } 10946 10947 /** 10948 * Drag and drop. App calls startDrag(), then callbacks to the shadow builder's 10949 * {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} and 10950 * {@link DragShadowBuilder#onDrawShadow(Canvas)} methods happen, then the drag 10951 * operation is handed over to the OS. 10952 * !!! TODO: real docs 10953 * 10954 * @param data !!! TODO 10955 * @param shadowBuilder !!! TODO 10956 * @param myLocalState An arbitrary object that will be passed as part of every DragEvent 10957 * delivered to the calling application during the course of the current drag operation. 10958 * This object is private to the application that called startDrag(), and is not 10959 * visible to other applications. It provides a lightweight way for the application to 10960 * propagate information from the initiator to the recipient of a drag within its own 10961 * application; for example, to help disambiguate between 'copy' and 'move' semantics. 10962 * @param flags Flags affecting the drag operation. At present no flags are defined; 10963 * pass 0 for this parameter. 10964 * @return {@code true} if the drag operation was initiated successfully; {@code false} if 10965 * an error prevented the drag from taking place. 10966 */ 10967 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 10968 Object myLocalState, int flags) { 10969 if (ViewDebug.DEBUG_DRAG) { 10970 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 10971 } 10972 boolean okay = false; 10973 10974 Point shadowSize = new Point(); 10975 Point shadowTouchPoint = new Point(); 10976 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 10977 10978 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 10979 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 10980 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 10981 } 10982 10983 if (ViewDebug.DEBUG_DRAG) { 10984 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 10985 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 10986 } 10987 Surface surface = new Surface(); 10988 try { 10989 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 10990 flags, shadowSize.x, shadowSize.y, surface); 10991 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 10992 + " surface=" + surface); 10993 if (token != null) { 10994 Canvas canvas = surface.lockCanvas(null); 10995 try { 10996 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 10997 shadowBuilder.onDrawShadow(canvas); 10998 } finally { 10999 surface.unlockCanvasAndPost(canvas); 11000 } 11001 11002 final ViewRoot root = getViewRoot(); 11003 11004 // Cache the local state object for delivery with DragEvents 11005 root.setLocalDragState(myLocalState); 11006 11007 // repurpose 'shadowSize' for the last touch point 11008 root.getLastTouchPoint(shadowSize); 11009 11010 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 11011 shadowSize.x, shadowSize.y, 11012 shadowTouchPoint.x, shadowTouchPoint.y, data); 11013 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 11014 } 11015 } catch (Exception e) { 11016 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 11017 surface.destroy(); 11018 } 11019 11020 return okay; 11021 } 11022 11023 /** 11024 * Drag-and-drop event dispatch. The event.getAction() verb is one of the DragEvent 11025 * constants DRAG_STARTED_EVENT, DRAG_EVENT, DROP_EVENT, and DRAG_ENDED_EVENT. 11026 * 11027 * For DRAG_STARTED_EVENT, event.getClipDescription() describes the content 11028 * being dragged. onDragEvent() should return 'true' if the view can handle 11029 * a drop of that content. A view that returns 'false' here will receive no 11030 * further calls to onDragEvent() about the drag/drop operation. 11031 * 11032 * For DRAG_ENTERED, event.getClipDescription() describes the content being 11033 * dragged. This will be the same content description passed in the 11034 * DRAG_STARTED_EVENT invocation. 11035 * 11036 * For DRAG_EXITED, event.getClipDescription() describes the content being 11037 * dragged. This will be the same content description passed in the 11038 * DRAG_STARTED_EVENT invocation. The view should return to its approriate 11039 * drag-acceptance visual state. 11040 * 11041 * For DRAG_LOCATION_EVENT, event.getX() and event.getY() give the location in View 11042 * coordinates of the current drag point. The view must return 'true' if it 11043 * can accept a drop of the current drag content, false otherwise. 11044 * 11045 * For DROP_EVENT, event.getX() and event.getY() give the location of the drop 11046 * within the view; also, event.getClipData() returns the full data payload 11047 * being dropped. The view should return 'true' if it consumed the dropped 11048 * content, 'false' if it did not. 11049 * 11050 * For DRAG_ENDED_EVENT, the 'event' argument may be null. The view should return 11051 * to its normal visual state. 11052 */ 11053 public boolean onDragEvent(DragEvent event) { 11054 return false; 11055 } 11056 11057 /** 11058 * Views typically don't need to override dispatchDragEvent(); it just calls 11059 * onDragEvent(event) and passes the result up appropriately. 11060 */ 11061 public boolean dispatchDragEvent(DragEvent event) { 11062 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 11063 && mOnDragListener.onDrag(this, event)) { 11064 return true; 11065 } 11066 return onDragEvent(event); 11067 } 11068 11069 /** 11070 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 11071 * it is ever exposed at all. 11072 * @hide 11073 */ 11074 public void onCloseSystemDialogs(String reason) { 11075 } 11076 11077 /** 11078 * Given a Drawable whose bounds have been set to draw into this view, 11079 * update a Region being computed for {@link #gatherTransparentRegion} so 11080 * that any non-transparent parts of the Drawable are removed from the 11081 * given transparent region. 11082 * 11083 * @param dr The Drawable whose transparency is to be applied to the region. 11084 * @param region A Region holding the current transparency information, 11085 * where any parts of the region that are set are considered to be 11086 * transparent. On return, this region will be modified to have the 11087 * transparency information reduced by the corresponding parts of the 11088 * Drawable that are not transparent. 11089 * {@hide} 11090 */ 11091 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 11092 if (DBG) { 11093 Log.i("View", "Getting transparent region for: " + this); 11094 } 11095 final Region r = dr.getTransparentRegion(); 11096 final Rect db = dr.getBounds(); 11097 final AttachInfo attachInfo = mAttachInfo; 11098 if (r != null && attachInfo != null) { 11099 final int w = getRight()-getLeft(); 11100 final int h = getBottom()-getTop(); 11101 if (db.left > 0) { 11102 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 11103 r.op(0, 0, db.left, h, Region.Op.UNION); 11104 } 11105 if (db.right < w) { 11106 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 11107 r.op(db.right, 0, w, h, Region.Op.UNION); 11108 } 11109 if (db.top > 0) { 11110 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 11111 r.op(0, 0, w, db.top, Region.Op.UNION); 11112 } 11113 if (db.bottom < h) { 11114 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 11115 r.op(0, db.bottom, w, h, Region.Op.UNION); 11116 } 11117 final int[] location = attachInfo.mTransparentLocation; 11118 getLocationInWindow(location); 11119 r.translate(location[0], location[1]); 11120 region.op(r, Region.Op.INTERSECT); 11121 } else { 11122 region.op(db, Region.Op.DIFFERENCE); 11123 } 11124 } 11125 11126 private void postCheckForLongClick(int delayOffset) { 11127 mHasPerformedLongPress = false; 11128 11129 if (mPendingCheckForLongPress == null) { 11130 mPendingCheckForLongPress = new CheckForLongPress(); 11131 } 11132 mPendingCheckForLongPress.rememberWindowAttachCount(); 11133 postDelayed(mPendingCheckForLongPress, 11134 ViewConfiguration.getLongPressTimeout() - delayOffset); 11135 } 11136 11137 /** 11138 * Inflate a view from an XML resource. This convenience method wraps the {@link 11139 * LayoutInflater} class, which provides a full range of options for view inflation. 11140 * 11141 * @param context The Context object for your activity or application. 11142 * @param resource The resource ID to inflate 11143 * @param root A view group that will be the parent. Used to properly inflate the 11144 * layout_* parameters. 11145 * @see LayoutInflater 11146 */ 11147 public static View inflate(Context context, int resource, ViewGroup root) { 11148 LayoutInflater factory = LayoutInflater.from(context); 11149 return factory.inflate(resource, root); 11150 } 11151 11152 /** 11153 * Scroll the view with standard behavior for scrolling beyond the normal 11154 * content boundaries. Views that call this method should override 11155 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 11156 * results of an over-scroll operation. 11157 * 11158 * Views can use this method to handle any touch or fling-based scrolling. 11159 * 11160 * @param deltaX Change in X in pixels 11161 * @param deltaY Change in Y in pixels 11162 * @param scrollX Current X scroll value in pixels before applying deltaX 11163 * @param scrollY Current Y scroll value in pixels before applying deltaY 11164 * @param scrollRangeX Maximum content scroll range along the X axis 11165 * @param scrollRangeY Maximum content scroll range along the Y axis 11166 * @param maxOverScrollX Number of pixels to overscroll by in either direction 11167 * along the X axis. 11168 * @param maxOverScrollY Number of pixels to overscroll by in either direction 11169 * along the Y axis. 11170 * @param isTouchEvent true if this scroll operation is the result of a touch event. 11171 * @return true if scrolling was clamped to an over-scroll boundary along either 11172 * axis, false otherwise. 11173 */ 11174 protected boolean overScrollBy(int deltaX, int deltaY, 11175 int scrollX, int scrollY, 11176 int scrollRangeX, int scrollRangeY, 11177 int maxOverScrollX, int maxOverScrollY, 11178 boolean isTouchEvent) { 11179 final int overScrollMode = mOverScrollMode; 11180 final boolean canScrollHorizontal = 11181 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 11182 final boolean canScrollVertical = 11183 computeVerticalScrollRange() > computeVerticalScrollExtent(); 11184 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 11185 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 11186 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 11187 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 11188 11189 int newScrollX = scrollX + deltaX; 11190 if (!overScrollHorizontal) { 11191 maxOverScrollX = 0; 11192 } 11193 11194 int newScrollY = scrollY + deltaY; 11195 if (!overScrollVertical) { 11196 maxOverScrollY = 0; 11197 } 11198 11199 // Clamp values if at the limits and record 11200 final int left = -maxOverScrollX; 11201 final int right = maxOverScrollX + scrollRangeX; 11202 final int top = -maxOverScrollY; 11203 final int bottom = maxOverScrollY + scrollRangeY; 11204 11205 boolean clampedX = false; 11206 if (newScrollX > right) { 11207 newScrollX = right; 11208 clampedX = true; 11209 } else if (newScrollX < left) { 11210 newScrollX = left; 11211 clampedX = true; 11212 } 11213 11214 boolean clampedY = false; 11215 if (newScrollY > bottom) { 11216 newScrollY = bottom; 11217 clampedY = true; 11218 } else if (newScrollY < top) { 11219 newScrollY = top; 11220 clampedY = true; 11221 } 11222 11223 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 11224 11225 return clampedX || clampedY; 11226 } 11227 11228 /** 11229 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 11230 * respond to the results of an over-scroll operation. 11231 * 11232 * @param scrollX New X scroll value in pixels 11233 * @param scrollY New Y scroll value in pixels 11234 * @param clampedX True if scrollX was clamped to an over-scroll boundary 11235 * @param clampedY True if scrollY was clamped to an over-scroll boundary 11236 */ 11237 protected void onOverScrolled(int scrollX, int scrollY, 11238 boolean clampedX, boolean clampedY) { 11239 // Intentionally empty. 11240 } 11241 11242 /** 11243 * Returns the over-scroll mode for this view. The result will be 11244 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11245 * (allow over-scrolling only if the view content is larger than the container), 11246 * or {@link #OVER_SCROLL_NEVER}. 11247 * 11248 * @return This view's over-scroll mode. 11249 */ 11250 public int getOverScrollMode() { 11251 return mOverScrollMode; 11252 } 11253 11254 /** 11255 * Set the over-scroll mode for this view. Valid over-scroll modes are 11256 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11257 * (allow over-scrolling only if the view content is larger than the container), 11258 * or {@link #OVER_SCROLL_NEVER}. 11259 * 11260 * Setting the over-scroll mode of a view will have an effect only if the 11261 * view is capable of scrolling. 11262 * 11263 * @param overScrollMode The new over-scroll mode for this view. 11264 */ 11265 public void setOverScrollMode(int overScrollMode) { 11266 if (overScrollMode != OVER_SCROLL_ALWAYS && 11267 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 11268 overScrollMode != OVER_SCROLL_NEVER) { 11269 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 11270 } 11271 mOverScrollMode = overScrollMode; 11272 } 11273 11274 /** 11275 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 11276 * Each MeasureSpec represents a requirement for either the width or the height. 11277 * A MeasureSpec is comprised of a size and a mode. There are three possible 11278 * modes: 11279 * <dl> 11280 * <dt>UNSPECIFIED</dt> 11281 * <dd> 11282 * The parent has not imposed any constraint on the child. It can be whatever size 11283 * it wants. 11284 * </dd> 11285 * 11286 * <dt>EXACTLY</dt> 11287 * <dd> 11288 * The parent has determined an exact size for the child. The child is going to be 11289 * given those bounds regardless of how big it wants to be. 11290 * </dd> 11291 * 11292 * <dt>AT_MOST</dt> 11293 * <dd> 11294 * The child can be as large as it wants up to the specified size. 11295 * </dd> 11296 * </dl> 11297 * 11298 * MeasureSpecs are implemented as ints to reduce object allocation. This class 11299 * is provided to pack and unpack the <size, mode> tuple into the int. 11300 */ 11301 public static class MeasureSpec { 11302 private static final int MODE_SHIFT = 30; 11303 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 11304 11305 /** 11306 * Measure specification mode: The parent has not imposed any constraint 11307 * on the child. It can be whatever size it wants. 11308 */ 11309 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 11310 11311 /** 11312 * Measure specification mode: The parent has determined an exact size 11313 * for the child. The child is going to be given those bounds regardless 11314 * of how big it wants to be. 11315 */ 11316 public static final int EXACTLY = 1 << MODE_SHIFT; 11317 11318 /** 11319 * Measure specification mode: The child can be as large as it wants up 11320 * to the specified size. 11321 */ 11322 public static final int AT_MOST = 2 << MODE_SHIFT; 11323 11324 /** 11325 * Creates a measure specification based on the supplied size and mode. 11326 * 11327 * The mode must always be one of the following: 11328 * <ul> 11329 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 11330 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 11331 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 11332 * </ul> 11333 * 11334 * @param size the size of the measure specification 11335 * @param mode the mode of the measure specification 11336 * @return the measure specification based on size and mode 11337 */ 11338 public static int makeMeasureSpec(int size, int mode) { 11339 return size + mode; 11340 } 11341 11342 /** 11343 * Extracts the mode from the supplied measure specification. 11344 * 11345 * @param measureSpec the measure specification to extract the mode from 11346 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 11347 * {@link android.view.View.MeasureSpec#AT_MOST} or 11348 * {@link android.view.View.MeasureSpec#EXACTLY} 11349 */ 11350 public static int getMode(int measureSpec) { 11351 return (measureSpec & MODE_MASK); 11352 } 11353 11354 /** 11355 * Extracts the size from the supplied measure specification. 11356 * 11357 * @param measureSpec the measure specification to extract the size from 11358 * @return the size in pixels defined in the supplied measure specification 11359 */ 11360 public static int getSize(int measureSpec) { 11361 return (measureSpec & ~MODE_MASK); 11362 } 11363 11364 /** 11365 * Returns a String representation of the specified measure 11366 * specification. 11367 * 11368 * @param measureSpec the measure specification to convert to a String 11369 * @return a String with the following format: "MeasureSpec: MODE SIZE" 11370 */ 11371 public static String toString(int measureSpec) { 11372 int mode = getMode(measureSpec); 11373 int size = getSize(measureSpec); 11374 11375 StringBuilder sb = new StringBuilder("MeasureSpec: "); 11376 11377 if (mode == UNSPECIFIED) 11378 sb.append("UNSPECIFIED "); 11379 else if (mode == EXACTLY) 11380 sb.append("EXACTLY "); 11381 else if (mode == AT_MOST) 11382 sb.append("AT_MOST "); 11383 else 11384 sb.append(mode).append(" "); 11385 11386 sb.append(size); 11387 return sb.toString(); 11388 } 11389 } 11390 11391 class CheckForLongPress implements Runnable { 11392 11393 private int mOriginalWindowAttachCount; 11394 11395 public void run() { 11396 if (isPressed() && (mParent != null) 11397 && mOriginalWindowAttachCount == mWindowAttachCount) { 11398 if (performLongClick()) { 11399 mHasPerformedLongPress = true; 11400 } 11401 } 11402 } 11403 11404 public void rememberWindowAttachCount() { 11405 mOriginalWindowAttachCount = mWindowAttachCount; 11406 } 11407 } 11408 11409 private final class CheckForTap implements Runnable { 11410 public void run() { 11411 mPrivateFlags &= ~PREPRESSED; 11412 mPrivateFlags |= PRESSED; 11413 refreshDrawableState(); 11414 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 11415 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 11416 } 11417 } 11418 } 11419 11420 private final class PerformClick implements Runnable { 11421 public void run() { 11422 performClick(); 11423 } 11424 } 11425 11426 /** 11427 * Interface definition for a callback to be invoked when a key event is 11428 * dispatched to this view. The callback will be invoked before the key 11429 * event is given to the view. 11430 */ 11431 public interface OnKeyListener { 11432 /** 11433 * Called when a key is dispatched to a view. This allows listeners to 11434 * get a chance to respond before the target view. 11435 * 11436 * @param v The view the key has been dispatched to. 11437 * @param keyCode The code for the physical key that was pressed 11438 * @param event The KeyEvent object containing full information about 11439 * the event. 11440 * @return True if the listener has consumed the event, false otherwise. 11441 */ 11442 boolean onKey(View v, int keyCode, KeyEvent event); 11443 } 11444 11445 /** 11446 * Interface definition for a callback to be invoked when a touch event is 11447 * dispatched to this view. The callback will be invoked before the touch 11448 * event is given to the view. 11449 */ 11450 public interface OnTouchListener { 11451 /** 11452 * Called when a touch event is dispatched to a view. This allows listeners to 11453 * get a chance to respond before the target view. 11454 * 11455 * @param v The view the touch event has been dispatched to. 11456 * @param event The MotionEvent object containing full information about 11457 * the event. 11458 * @return True if the listener has consumed the event, false otherwise. 11459 */ 11460 boolean onTouch(View v, MotionEvent event); 11461 } 11462 11463 /** 11464 * Interface definition for a callback to be invoked when a view has been clicked and held. 11465 */ 11466 public interface OnLongClickListener { 11467 /** 11468 * Called when a view has been clicked and held. 11469 * 11470 * @param v The view that was clicked and held. 11471 * 11472 * @return true if the callback consumed the long click, false otherwise. 11473 */ 11474 boolean onLongClick(View v); 11475 } 11476 11477 /** 11478 * Interface definition for a callback to be invoked when a drag is being dispatched 11479 * to this view. The callback will be invoked before the hosting view's own 11480 * onDrag(event) method. If the listener wants to fall back to the hosting view's 11481 * onDrag(event) behavior, it should return 'false' from this callback. 11482 */ 11483 public interface OnDragListener { 11484 /** 11485 * Called when a drag event is dispatched to a view. This allows listeners 11486 * to get a chance to override base View behavior. 11487 * 11488 * @param v The view the drag has been dispatched to. 11489 * @param event The DragEvent object containing full information 11490 * about the event. 11491 * @return true if the listener consumed the DragEvent, false in order to fall 11492 * back to the view's default handling. 11493 */ 11494 boolean onDrag(View v, DragEvent event); 11495 } 11496 11497 /** 11498 * Interface definition for a callback to be invoked when the focus state of 11499 * a view changed. 11500 */ 11501 public interface OnFocusChangeListener { 11502 /** 11503 * Called when the focus state of a view has changed. 11504 * 11505 * @param v The view whose state has changed. 11506 * @param hasFocus The new focus state of v. 11507 */ 11508 void onFocusChange(View v, boolean hasFocus); 11509 } 11510 11511 /** 11512 * Interface definition for a callback to be invoked when a view is clicked. 11513 */ 11514 public interface OnClickListener { 11515 /** 11516 * Called when a view has been clicked. 11517 * 11518 * @param v The view that was clicked. 11519 */ 11520 void onClick(View v); 11521 } 11522 11523 /** 11524 * Interface definition for a callback to be invoked when the context menu 11525 * for this view is being built. 11526 */ 11527 public interface OnCreateContextMenuListener { 11528 /** 11529 * Called when the context menu for this view is being built. It is not 11530 * safe to hold onto the menu after this method returns. 11531 * 11532 * @param menu The context menu that is being built 11533 * @param v The view for which the context menu is being built 11534 * @param menuInfo Extra information about the item for which the 11535 * context menu should be shown. This information will vary 11536 * depending on the class of v. 11537 */ 11538 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 11539 } 11540 11541 /** 11542 * Interface definition for a callback to be invoked when the status bar changes 11543 * visibility. 11544 * 11545 * @see #setOnSystemUiVisibilityChangeListener 11546 */ 11547 public interface OnSystemUiVisibilityChangeListener { 11548 /** 11549 * Called when the status bar changes visibility because of a call to 11550 * {@link #setSystemUiVisibility}. 11551 * 11552 * @param visibility {@link #STATUS_BAR_VISIBLE} or {@link #STATUS_BAR_HIDDEN}. 11553 */ 11554 public void onSystemUiVisibilityChange(int visibility); 11555 } 11556 11557 private final class UnsetPressedState implements Runnable { 11558 public void run() { 11559 setPressed(false); 11560 } 11561 } 11562 11563 /** 11564 * Base class for derived classes that want to save and restore their own 11565 * state in {@link android.view.View#onSaveInstanceState()}. 11566 */ 11567 public static class BaseSavedState extends AbsSavedState { 11568 /** 11569 * Constructor used when reading from a parcel. Reads the state of the superclass. 11570 * 11571 * @param source 11572 */ 11573 public BaseSavedState(Parcel source) { 11574 super(source); 11575 } 11576 11577 /** 11578 * Constructor called by derived classes when creating their SavedState objects 11579 * 11580 * @param superState The state of the superclass of this view 11581 */ 11582 public BaseSavedState(Parcelable superState) { 11583 super(superState); 11584 } 11585 11586 public static final Parcelable.Creator<BaseSavedState> CREATOR = 11587 new Parcelable.Creator<BaseSavedState>() { 11588 public BaseSavedState createFromParcel(Parcel in) { 11589 return new BaseSavedState(in); 11590 } 11591 11592 public BaseSavedState[] newArray(int size) { 11593 return new BaseSavedState[size]; 11594 } 11595 }; 11596 } 11597 11598 /** 11599 * A set of information given to a view when it is attached to its parent 11600 * window. 11601 */ 11602 static class AttachInfo { 11603 interface Callbacks { 11604 void playSoundEffect(int effectId); 11605 boolean performHapticFeedback(int effectId, boolean always); 11606 } 11607 11608 /** 11609 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 11610 * to a Handler. This class contains the target (View) to invalidate and 11611 * the coordinates of the dirty rectangle. 11612 * 11613 * For performance purposes, this class also implements a pool of up to 11614 * POOL_LIMIT objects that get reused. This reduces memory allocations 11615 * whenever possible. 11616 */ 11617 static class InvalidateInfo implements Poolable<InvalidateInfo> { 11618 private static final int POOL_LIMIT = 10; 11619 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 11620 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 11621 public InvalidateInfo newInstance() { 11622 return new InvalidateInfo(); 11623 } 11624 11625 public void onAcquired(InvalidateInfo element) { 11626 } 11627 11628 public void onReleased(InvalidateInfo element) { 11629 } 11630 }, POOL_LIMIT) 11631 ); 11632 11633 private InvalidateInfo mNext; 11634 11635 View target; 11636 11637 int left; 11638 int top; 11639 int right; 11640 int bottom; 11641 11642 public void setNextPoolable(InvalidateInfo element) { 11643 mNext = element; 11644 } 11645 11646 public InvalidateInfo getNextPoolable() { 11647 return mNext; 11648 } 11649 11650 static InvalidateInfo acquire() { 11651 return sPool.acquire(); 11652 } 11653 11654 void release() { 11655 sPool.release(this); 11656 } 11657 } 11658 11659 final IWindowSession mSession; 11660 11661 final IWindow mWindow; 11662 11663 final IBinder mWindowToken; 11664 11665 final Callbacks mRootCallbacks; 11666 11667 Canvas mHardwareCanvas; 11668 11669 /** 11670 * The top view of the hierarchy. 11671 */ 11672 View mRootView; 11673 11674 IBinder mPanelParentWindowToken; 11675 Surface mSurface; 11676 11677 boolean mHardwareAccelerated; 11678 boolean mHardwareAccelerationRequested; 11679 HardwareRenderer mHardwareRenderer; 11680 11681 /** 11682 * Scale factor used by the compatibility mode 11683 */ 11684 float mApplicationScale; 11685 11686 /** 11687 * Indicates whether the application is in compatibility mode 11688 */ 11689 boolean mScalingRequired; 11690 11691 /** 11692 * Left position of this view's window 11693 */ 11694 int mWindowLeft; 11695 11696 /** 11697 * Top position of this view's window 11698 */ 11699 int mWindowTop; 11700 11701 /** 11702 * Indicates whether views need to use 32-bit drawing caches 11703 */ 11704 boolean mUse32BitDrawingCache; 11705 11706 /** 11707 * For windows that are full-screen but using insets to layout inside 11708 * of the screen decorations, these are the current insets for the 11709 * content of the window. 11710 */ 11711 final Rect mContentInsets = new Rect(); 11712 11713 /** 11714 * For windows that are full-screen but using insets to layout inside 11715 * of the screen decorations, these are the current insets for the 11716 * actual visible parts of the window. 11717 */ 11718 final Rect mVisibleInsets = new Rect(); 11719 11720 /** 11721 * The internal insets given by this window. This value is 11722 * supplied by the client (through 11723 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 11724 * be given to the window manager when changed to be used in laying 11725 * out windows behind it. 11726 */ 11727 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 11728 = new ViewTreeObserver.InternalInsetsInfo(); 11729 11730 /** 11731 * All views in the window's hierarchy that serve as scroll containers, 11732 * used to determine if the window can be resized or must be panned 11733 * to adjust for a soft input area. 11734 */ 11735 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 11736 11737 final KeyEvent.DispatcherState mKeyDispatchState 11738 = new KeyEvent.DispatcherState(); 11739 11740 /** 11741 * Indicates whether the view's window currently has the focus. 11742 */ 11743 boolean mHasWindowFocus; 11744 11745 /** 11746 * The current visibility of the window. 11747 */ 11748 int mWindowVisibility; 11749 11750 /** 11751 * Indicates the time at which drawing started to occur. 11752 */ 11753 long mDrawingTime; 11754 11755 /** 11756 * Indicates whether or not ignoring the DIRTY_MASK flags. 11757 */ 11758 boolean mIgnoreDirtyState; 11759 11760 /** 11761 * Indicates whether the view's window is currently in touch mode. 11762 */ 11763 boolean mInTouchMode; 11764 11765 /** 11766 * Indicates that ViewRoot should trigger a global layout change 11767 * the next time it performs a traversal 11768 */ 11769 boolean mRecomputeGlobalAttributes; 11770 11771 /** 11772 * Set during a traveral if any views want to keep the screen on. 11773 */ 11774 boolean mKeepScreenOn; 11775 11776 /** 11777 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 11778 */ 11779 int mSystemUiVisibility; 11780 11781 /** 11782 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 11783 * attached. 11784 */ 11785 boolean mHasSystemUiListeners; 11786 11787 /** 11788 * Set if the visibility of any views has changed. 11789 */ 11790 boolean mViewVisibilityChanged; 11791 11792 /** 11793 * Set to true if a view has been scrolled. 11794 */ 11795 boolean mViewScrollChanged; 11796 11797 /** 11798 * Global to the view hierarchy used as a temporary for dealing with 11799 * x/y points in the transparent region computations. 11800 */ 11801 final int[] mTransparentLocation = new int[2]; 11802 11803 /** 11804 * Global to the view hierarchy used as a temporary for dealing with 11805 * x/y points in the ViewGroup.invalidateChild implementation. 11806 */ 11807 final int[] mInvalidateChildLocation = new int[2]; 11808 11809 11810 /** 11811 * Global to the view hierarchy used as a temporary for dealing with 11812 * x/y location when view is transformed. 11813 */ 11814 final float[] mTmpTransformLocation = new float[2]; 11815 11816 /** 11817 * The view tree observer used to dispatch global events like 11818 * layout, pre-draw, touch mode change, etc. 11819 */ 11820 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 11821 11822 /** 11823 * A Canvas used by the view hierarchy to perform bitmap caching. 11824 */ 11825 Canvas mCanvas; 11826 11827 /** 11828 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 11829 * handler can be used to pump events in the UI events queue. 11830 */ 11831 final Handler mHandler; 11832 11833 /** 11834 * Identifier for messages requesting the view to be invalidated. 11835 * Such messages should be sent to {@link #mHandler}. 11836 */ 11837 static final int INVALIDATE_MSG = 0x1; 11838 11839 /** 11840 * Identifier for messages requesting the view to invalidate a region. 11841 * Such messages should be sent to {@link #mHandler}. 11842 */ 11843 static final int INVALIDATE_RECT_MSG = 0x2; 11844 11845 /** 11846 * Temporary for use in computing invalidate rectangles while 11847 * calling up the hierarchy. 11848 */ 11849 final Rect mTmpInvalRect = new Rect(); 11850 11851 /** 11852 * Temporary for use in computing hit areas with transformed views 11853 */ 11854 final RectF mTmpTransformRect = new RectF(); 11855 11856 /** 11857 * Temporary list for use in collecting focusable descendents of a view. 11858 */ 11859 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 11860 11861 /** 11862 * Creates a new set of attachment information with the specified 11863 * events handler and thread. 11864 * 11865 * @param handler the events handler the view must use 11866 */ 11867 AttachInfo(IWindowSession session, IWindow window, 11868 Handler handler, Callbacks effectPlayer) { 11869 mSession = session; 11870 mWindow = window; 11871 mWindowToken = window.asBinder(); 11872 mHandler = handler; 11873 mRootCallbacks = effectPlayer; 11874 } 11875 } 11876 11877 /** 11878 * <p>ScrollabilityCache holds various fields used by a View when scrolling 11879 * is supported. This avoids keeping too many unused fields in most 11880 * instances of View.</p> 11881 */ 11882 private static class ScrollabilityCache implements Runnable { 11883 11884 /** 11885 * Scrollbars are not visible 11886 */ 11887 public static final int OFF = 0; 11888 11889 /** 11890 * Scrollbars are visible 11891 */ 11892 public static final int ON = 1; 11893 11894 /** 11895 * Scrollbars are fading away 11896 */ 11897 public static final int FADING = 2; 11898 11899 public boolean fadeScrollBars; 11900 11901 public int fadingEdgeLength; 11902 public int scrollBarDefaultDelayBeforeFade; 11903 public int scrollBarFadeDuration; 11904 11905 public int scrollBarSize; 11906 public ScrollBarDrawable scrollBar; 11907 public float[] interpolatorValues; 11908 public View host; 11909 11910 public final Paint paint; 11911 public final Matrix matrix; 11912 public Shader shader; 11913 11914 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 11915 11916 private static final float[] OPAQUE = { 255 }; 11917 private static final float[] TRANSPARENT = { 0.0f }; 11918 11919 /** 11920 * When fading should start. This time moves into the future every time 11921 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 11922 */ 11923 public long fadeStartTime; 11924 11925 11926 /** 11927 * The current state of the scrollbars: ON, OFF, or FADING 11928 */ 11929 public int state = OFF; 11930 11931 private int mLastColor; 11932 11933 public ScrollabilityCache(ViewConfiguration configuration, View host) { 11934 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 11935 scrollBarSize = configuration.getScaledScrollBarSize(); 11936 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 11937 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 11938 11939 paint = new Paint(); 11940 matrix = new Matrix(); 11941 // use use a height of 1, and then wack the matrix each time we 11942 // actually use it. 11943 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 11944 11945 paint.setShader(shader); 11946 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 11947 this.host = host; 11948 } 11949 11950 public void setFadeColor(int color) { 11951 if (color != 0 && color != mLastColor) { 11952 mLastColor = color; 11953 color |= 0xFF000000; 11954 11955 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 11956 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 11957 11958 paint.setShader(shader); 11959 // Restore the default transfer mode (src_over) 11960 paint.setXfermode(null); 11961 } 11962 } 11963 11964 public void run() { 11965 long now = AnimationUtils.currentAnimationTimeMillis(); 11966 if (now >= fadeStartTime) { 11967 11968 // the animation fades the scrollbars out by changing 11969 // the opacity (alpha) from fully opaque to fully 11970 // transparent 11971 int nextFrame = (int) now; 11972 int framesCount = 0; 11973 11974 Interpolator interpolator = scrollBarInterpolator; 11975 11976 // Start opaque 11977 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 11978 11979 // End transparent 11980 nextFrame += scrollBarFadeDuration; 11981 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 11982 11983 state = FADING; 11984 11985 // Kick off the fade animation 11986 host.invalidate(); 11987 } 11988 } 11989 11990 } 11991} 11992