View.java revision 82782446cd0ea26604fcbd22d4b7e3608f32136d
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import com.android.internal.R; 20import com.android.internal.util.Predicate; 21import com.android.internal.view.menu.MenuBuilder; 22 23import android.content.ClipData; 24import android.content.Context; 25import android.content.res.Configuration; 26import android.content.res.Resources; 27import android.content.res.TypedArray; 28import android.graphics.Bitmap; 29import android.graphics.Camera; 30import android.graphics.Canvas; 31import android.graphics.Interpolator; 32import android.graphics.LinearGradient; 33import android.graphics.Matrix; 34import android.graphics.Paint; 35import android.graphics.PixelFormat; 36import android.graphics.Point; 37import android.graphics.PorterDuff; 38import android.graphics.PorterDuffXfermode; 39import android.graphics.Rect; 40import android.graphics.RectF; 41import android.graphics.Region; 42import android.graphics.Shader; 43import android.graphics.drawable.ColorDrawable; 44import android.graphics.drawable.Drawable; 45import android.os.Handler; 46import android.os.IBinder; 47import android.os.Message; 48import android.os.Parcel; 49import android.os.Parcelable; 50import android.os.RemoteException; 51import android.os.SystemClock; 52import android.os.SystemProperties; 53import android.util.AttributeSet; 54import android.util.Log; 55import android.util.Pool; 56import android.util.Poolable; 57import android.util.PoolableManager; 58import android.util.Pools; 59import android.util.SparseArray; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.accessibility.AccessibilityEvent; 62import android.view.accessibility.AccessibilityEventSource; 63import android.view.accessibility.AccessibilityManager; 64import android.view.animation.Animation; 65import android.view.animation.AnimationUtils; 66import android.view.inputmethod.EditorInfo; 67import android.view.inputmethod.InputConnection; 68import android.view.inputmethod.InputMethodManager; 69import android.widget.ScrollBarDrawable; 70 71import java.lang.ref.WeakReference; 72import java.lang.reflect.InvocationTargetException; 73import java.lang.reflect.Method; 74import java.util.ArrayList; 75import java.util.Arrays; 76import java.util.List; 77import java.util.WeakHashMap; 78 79/** 80 * <p> 81 * This class represents the basic building block for user interface components. A View 82 * occupies a rectangular area on the screen and is responsible for drawing and 83 * event handling. View is the base class for <em>widgets</em>, which are 84 * used to create interactive UI components (buttons, text fields, etc.). The 85 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 86 * are invisible containers that hold other Views (or other ViewGroups) and define 87 * their layout properties. 88 * </p> 89 * 90 * <div class="special"> 91 * <p>For an introduction to using this class to develop your 92 * application's user interface, read the Developer Guide documentation on 93 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 94 * include: 95 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 96 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 97 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 103 * </p> 104 * </div> 105 * 106 * <a name="Using"></a> 107 * <h3>Using Views</h3> 108 * <p> 109 * All of the views in a window are arranged in a single tree. You can add views 110 * either from code or by specifying a tree of views in one or more XML layout 111 * files. There are many specialized subclasses of views that act as controls or 112 * are capable of displaying text, images, or other content. 113 * </p> 114 * <p> 115 * Once you have created a tree of views, there are typically a few types of 116 * common operations you may wish to perform: 117 * <ul> 118 * <li><strong>Set properties:</strong> for example setting the text of a 119 * {@link android.widget.TextView}. The available properties and the methods 120 * that set them will vary among the different subclasses of views. Note that 121 * properties that are known at build time can be set in the XML layout 122 * files.</li> 123 * <li><strong>Set focus:</strong> The framework will handled moving focus in 124 * response to user input. To force focus to a specific view, call 125 * {@link #requestFocus}.</li> 126 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 127 * that will be notified when something interesting happens to the view. For 128 * example, all views will let you set a listener to be notified when the view 129 * gains or loses focus. You can register such a listener using 130 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 131 * specialized listeners. For example, a Button exposes a listener to notify 132 * clients when the button is clicked.</li> 133 * <li><strong>Set visibility:</strong> You can hide or show views using 134 * {@link #setVisibility}.</li> 135 * </ul> 136 * </p> 137 * <p><em> 138 * Note: The Android framework is responsible for measuring, laying out and 139 * drawing views. You should not call methods that perform these actions on 140 * views yourself unless you are actually implementing a 141 * {@link android.view.ViewGroup}. 142 * </em></p> 143 * 144 * <a name="Lifecycle"></a> 145 * <h3>Implementing a Custom View</h3> 146 * 147 * <p> 148 * To implement a custom view, you will usually begin by providing overrides for 149 * some of the standard methods that the framework calls on all views. You do 150 * not need to override all of these methods. In fact, you can start by just 151 * overriding {@link #onDraw(android.graphics.Canvas)}. 152 * <table border="2" width="85%" align="center" cellpadding="5"> 153 * <thead> 154 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 155 * </thead> 156 * 157 * <tbody> 158 * <tr> 159 * <td rowspan="2">Creation</td> 160 * <td>Constructors</td> 161 * <td>There is a form of the constructor that are called when the view 162 * is created from code and a form that is called when the view is 163 * inflated from a layout file. The second form should parse and apply 164 * any attributes defined in the layout file. 165 * </td> 166 * </tr> 167 * <tr> 168 * <td><code>{@link #onFinishInflate()}</code></td> 169 * <td>Called after a view and all of its children has been inflated 170 * from XML.</td> 171 * </tr> 172 * 173 * <tr> 174 * <td rowspan="3">Layout</td> 175 * <td><code>{@link #onMeasure}</code></td> 176 * <td>Called to determine the size requirements for this view and all 177 * of its children. 178 * </td> 179 * </tr> 180 * <tr> 181 * <td><code>{@link #onLayout}</code></td> 182 * <td>Called when this view should assign a size and position to all 183 * of its children. 184 * </td> 185 * </tr> 186 * <tr> 187 * <td><code>{@link #onSizeChanged}</code></td> 188 * <td>Called when the size of this view has changed. 189 * </td> 190 * </tr> 191 * 192 * <tr> 193 * <td>Drawing</td> 194 * <td><code>{@link #onDraw}</code></td> 195 * <td>Called when the view should render its content. 196 * </td> 197 * </tr> 198 * 199 * <tr> 200 * <td rowspan="4">Event processing</td> 201 * <td><code>{@link #onKeyDown}</code></td> 202 * <td>Called when a new key event occurs. 203 * </td> 204 * </tr> 205 * <tr> 206 * <td><code>{@link #onKeyUp}</code></td> 207 * <td>Called when a key up event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onTrackballEvent}</code></td> 212 * <td>Called when a trackball motion event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTouchEvent}</code></td> 217 * <td>Called when a touch screen motion event occurs. 218 * </td> 219 * </tr> 220 * 221 * <tr> 222 * <td rowspan="2">Focus</td> 223 * <td><code>{@link #onFocusChanged}</code></td> 224 * <td>Called when the view gains or loses focus. 225 * </td> 226 * </tr> 227 * 228 * <tr> 229 * <td><code>{@link #onWindowFocusChanged}</code></td> 230 * <td>Called when the window containing the view gains or loses focus. 231 * </td> 232 * </tr> 233 * 234 * <tr> 235 * <td rowspan="3">Attaching</td> 236 * <td><code>{@link #onAttachedToWindow()}</code></td> 237 * <td>Called when the view is attached to a window. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td><code>{@link #onDetachedFromWindow}</code></td> 243 * <td>Called when the view is detached from its window. 244 * </td> 245 * </tr> 246 * 247 * <tr> 248 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 249 * <td>Called when the visibility of the window containing the view 250 * has changed. 251 * </td> 252 * </tr> 253 * </tbody> 254 * 255 * </table> 256 * </p> 257 * 258 * <a name="IDs"></a> 259 * <h3>IDs</h3> 260 * Views may have an integer id associated with them. These ids are typically 261 * assigned in the layout XML files, and are used to find specific views within 262 * the view tree. A common pattern is to: 263 * <ul> 264 * <li>Define a Button in the layout file and assign it a unique ID. 265 * <pre> 266 * <Button 267 * android:id="@+id/my_button" 268 * android:layout_width="wrap_content" 269 * android:layout_height="wrap_content" 270 * android:text="@string/my_button_text"/> 271 * </pre></li> 272 * <li>From the onCreate method of an Activity, find the Button 273 * <pre class="prettyprint"> 274 * Button myButton = (Button) findViewById(R.id.my_button); 275 * </pre></li> 276 * </ul> 277 * <p> 278 * View IDs need not be unique throughout the tree, but it is good practice to 279 * ensure that they are at least unique within the part of the tree you are 280 * searching. 281 * </p> 282 * 283 * <a name="Position"></a> 284 * <h3>Position</h3> 285 * <p> 286 * The geometry of a view is that of a rectangle. A view has a location, 287 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 288 * two dimensions, expressed as a width and a height. The unit for location 289 * and dimensions is the pixel. 290 * </p> 291 * 292 * <p> 293 * It is possible to retrieve the location of a view by invoking the methods 294 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 295 * coordinate of the rectangle representing the view. The latter returns the 296 * top, or Y, coordinate of the rectangle representing the view. These methods 297 * both return the location of the view relative to its parent. For instance, 298 * when getLeft() returns 20, that means the view is located 20 pixels to the 299 * right of the left edge of its direct parent. 300 * </p> 301 * 302 * <p> 303 * In addition, several convenience methods are offered to avoid unnecessary 304 * computations, namely {@link #getRight()} and {@link #getBottom()}. 305 * These methods return the coordinates of the right and bottom edges of the 306 * rectangle representing the view. For instance, calling {@link #getRight()} 307 * is similar to the following computation: <code>getLeft() + getWidth()</code> 308 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 309 * </p> 310 * 311 * <a name="SizePaddingMargins"></a> 312 * <h3>Size, padding and margins</h3> 313 * <p> 314 * The size of a view is expressed with a width and a height. A view actually 315 * possess two pairs of width and height values. 316 * </p> 317 * 318 * <p> 319 * The first pair is known as <em>measured width</em> and 320 * <em>measured height</em>. These dimensions define how big a view wants to be 321 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 322 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 323 * and {@link #getMeasuredHeight()}. 324 * </p> 325 * 326 * <p> 327 * The second pair is simply known as <em>width</em> and <em>height</em>, or 328 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 329 * dimensions define the actual size of the view on screen, at drawing time and 330 * after layout. These values may, but do not have to, be different from the 331 * measured width and height. The width and height can be obtained by calling 332 * {@link #getWidth()} and {@link #getHeight()}. 333 * </p> 334 * 335 * <p> 336 * To measure its dimensions, a view takes into account its padding. The padding 337 * is expressed in pixels for the left, top, right and bottom parts of the view. 338 * Padding can be used to offset the content of the view by a specific amount of 339 * pixels. For instance, a left padding of 2 will push the view's content by 340 * 2 pixels to the right of the left edge. Padding can be set using the 341 * {@link #setPadding(int, int, int, int)} method and queried by calling 342 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 343 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 344 * </p> 345 * 346 * <p> 347 * Even though a view can define a padding, it does not provide any support for 348 * margins. However, view groups provide such a support. Refer to 349 * {@link android.view.ViewGroup} and 350 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 351 * </p> 352 * 353 * <a name="Layout"></a> 354 * <h3>Layout</h3> 355 * <p> 356 * Layout is a two pass process: a measure pass and a layout pass. The measuring 357 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 358 * of the view tree. Each view pushes dimension specifications down the tree 359 * during the recursion. At the end of the measure pass, every view has stored 360 * its measurements. The second pass happens in 361 * {@link #layout(int,int,int,int)} and is also top-down. During 362 * this pass each parent is responsible for positioning all of its children 363 * using the sizes computed in the measure pass. 364 * </p> 365 * 366 * <p> 367 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 368 * {@link #getMeasuredHeight()} values must be set, along with those for all of 369 * that view's descendants. A view's measured width and measured height values 370 * must respect the constraints imposed by the view's parents. This guarantees 371 * that at the end of the measure pass, all parents accept all of their 372 * children's measurements. A parent view may call measure() more than once on 373 * its children. For example, the parent may measure each child once with 374 * unspecified dimensions to find out how big they want to be, then call 375 * measure() on them again with actual numbers if the sum of all the children's 376 * unconstrained sizes is too big or too small. 377 * </p> 378 * 379 * <p> 380 * The measure pass uses two classes to communicate dimensions. The 381 * {@link MeasureSpec} class is used by views to tell their parents how they 382 * want to be measured and positioned. The base LayoutParams class just 383 * describes how big the view wants to be for both width and height. For each 384 * dimension, it can specify one of: 385 * <ul> 386 * <li> an exact number 387 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 388 * (minus padding) 389 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 390 * enclose its content (plus padding). 391 * </ul> 392 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 393 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 394 * an X and Y value. 395 * </p> 396 * 397 * <p> 398 * MeasureSpecs are used to push requirements down the tree from parent to 399 * child. A MeasureSpec can be in one of three modes: 400 * <ul> 401 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 402 * of a child view. For example, a LinearLayout may call measure() on its child 403 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 404 * tall the child view wants to be given a width of 240 pixels. 405 * <li>EXACTLY: This is used by the parent to impose an exact size on the 406 * child. The child must use this size, and guarantee that all of its 407 * descendants will fit within this size. 408 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 409 * child. The child must gurantee that it and all of its descendants will fit 410 * within this size. 411 * </ul> 412 * </p> 413 * 414 * <p> 415 * To intiate a layout, call {@link #requestLayout}. This method is typically 416 * called by a view on itself when it believes that is can no longer fit within 417 * its current bounds. 418 * </p> 419 * 420 * <a name="Drawing"></a> 421 * <h3>Drawing</h3> 422 * <p> 423 * Drawing is handled by walking the tree and rendering each view that 424 * intersects the the invalid region. Because the tree is traversed in-order, 425 * this means that parents will draw before (i.e., behind) their children, with 426 * siblings drawn in the order they appear in the tree. 427 * If you set a background drawable for a View, then the View will draw it for you 428 * before calling back to its <code>onDraw()</code> method. 429 * </p> 430 * 431 * <p> 432 * Note that the framework will not draw views that are not in the invalid region. 433 * </p> 434 * 435 * <p> 436 * To force a view to draw, call {@link #invalidate()}. 437 * </p> 438 * 439 * <a name="EventHandlingThreading"></a> 440 * <h3>Event Handling and Threading</h3> 441 * <p> 442 * The basic cycle of a view is as follows: 443 * <ol> 444 * <li>An event comes in and is dispatched to the appropriate view. The view 445 * handles the event and notifies any listeners.</li> 446 * <li>If in the course of processing the event, the view's bounds may need 447 * to be changed, the view will call {@link #requestLayout()}.</li> 448 * <li>Similarly, if in the course of processing the event the view's appearance 449 * may need to be changed, the view will call {@link #invalidate()}.</li> 450 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 451 * the framework will take care of measuring, laying out, and drawing the tree 452 * as appropriate.</li> 453 * </ol> 454 * </p> 455 * 456 * <p><em>Note: The entire view tree is single threaded. You must always be on 457 * the UI thread when calling any method on any view.</em> 458 * If you are doing work on other threads and want to update the state of a view 459 * from that thread, you should use a {@link Handler}. 460 * </p> 461 * 462 * <a name="FocusHandling"></a> 463 * <h3>Focus Handling</h3> 464 * <p> 465 * The framework will handle routine focus movement in response to user input. 466 * This includes changing the focus as views are removed or hidden, or as new 467 * views become available. Views indicate their willingness to take focus 468 * through the {@link #isFocusable} method. To change whether a view can take 469 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 470 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 471 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 472 * </p> 473 * <p> 474 * Focus movement is based on an algorithm which finds the nearest neighbor in a 475 * given direction. In rare cases, the default algorithm may not match the 476 * intended behavior of the developer. In these situations, you can provide 477 * explicit overrides by using these XML attributes in the layout file: 478 * <pre> 479 * nextFocusDown 480 * nextFocusLeft 481 * nextFocusRight 482 * nextFocusUp 483 * </pre> 484 * </p> 485 * 486 * 487 * <p> 488 * To get a particular view to take focus, call {@link #requestFocus()}. 489 * </p> 490 * 491 * <a name="TouchMode"></a> 492 * <h3>Touch Mode</h3> 493 * <p> 494 * When a user is navigating a user interface via directional keys such as a D-pad, it is 495 * necessary to give focus to actionable items such as buttons so the user can see 496 * what will take input. If the device has touch capabilities, however, and the user 497 * begins interacting with the interface by touching it, it is no longer necessary to 498 * always highlight, or give focus to, a particular view. This motivates a mode 499 * for interaction named 'touch mode'. 500 * </p> 501 * <p> 502 * For a touch capable device, once the user touches the screen, the device 503 * will enter touch mode. From this point onward, only views for which 504 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 505 * Other views that are touchable, like buttons, will not take focus when touched; they will 506 * only fire the on click listeners. 507 * </p> 508 * <p> 509 * Any time a user hits a directional key, such as a D-pad direction, the view device will 510 * exit touch mode, and find a view to take focus, so that the user may resume interacting 511 * with the user interface without touching the screen again. 512 * </p> 513 * <p> 514 * The touch mode state is maintained across {@link android.app.Activity}s. Call 515 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 516 * </p> 517 * 518 * <a name="Scrolling"></a> 519 * <h3>Scrolling</h3> 520 * <p> 521 * The framework provides basic support for views that wish to internally 522 * scroll their content. This includes keeping track of the X and Y scroll 523 * offset as well as mechanisms for drawing scrollbars. See 524 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 525 * {@link #awakenScrollBars()} for more details. 526 * </p> 527 * 528 * <a name="Tags"></a> 529 * <h3>Tags</h3> 530 * <p> 531 * Unlike IDs, tags are not used to identify views. Tags are essentially an 532 * extra piece of information that can be associated with a view. They are most 533 * often used as a convenience to store data related to views in the views 534 * themselves rather than by putting them in a separate structure. 535 * </p> 536 * 537 * <a name="Animation"></a> 538 * <h3>Animation</h3> 539 * <p> 540 * You can attach an {@link Animation} object to a view using 541 * {@link #setAnimation(Animation)} or 542 * {@link #startAnimation(Animation)}. The animation can alter the scale, 543 * rotation, translation and alpha of a view over time. If the animation is 544 * attached to a view that has children, the animation will affect the entire 545 * subtree rooted by that node. When an animation is started, the framework will 546 * take care of redrawing the appropriate views until the animation completes. 547 * </p> 548 * <p> 549 * Starting with Android 3.0, the preferred way of animating views is to use the 550 * {@link android.animation} package APIs. 551 * </p> 552 * 553 * <a name="Security"></a> 554 * <h3>Security</h3> 555 * <p> 556 * Sometimes it is essential that an application be able to verify that an action 557 * is being performed with the full knowledge and consent of the user, such as 558 * granting a permission request, making a purchase or clicking on an advertisement. 559 * Unfortunately, a malicious application could try to spoof the user into 560 * performing these actions, unaware, by concealing the intended purpose of the view. 561 * As a remedy, the framework offers a touch filtering mechanism that can be used to 562 * improve the security of views that provide access to sensitive functionality. 563 * </p><p> 564 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured} or set the 565 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 566 * will discard touches that are received whenever the view's window is obscured by 567 * another visible window. As a result, the view will not receive touches whenever a 568 * toast, dialog or other window appears above the view's window. 569 * </p><p> 570 * For more fine-grained control over security, consider overriding the 571 * {@link #onFilterTouchEventForSecurity} method to implement your own security policy. 572 * See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 573 * </p> 574 * 575 * @attr ref android.R.styleable#View_alpha 576 * @attr ref android.R.styleable#View_background 577 * @attr ref android.R.styleable#View_clickable 578 * @attr ref android.R.styleable#View_contentDescription 579 * @attr ref android.R.styleable#View_drawingCacheQuality 580 * @attr ref android.R.styleable#View_duplicateParentState 581 * @attr ref android.R.styleable#View_id 582 * @attr ref android.R.styleable#View_fadingEdge 583 * @attr ref android.R.styleable#View_fadingEdgeLength 584 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 585 * @attr ref android.R.styleable#View_fitsSystemWindows 586 * @attr ref android.R.styleable#View_isScrollContainer 587 * @attr ref android.R.styleable#View_focusable 588 * @attr ref android.R.styleable#View_focusableInTouchMode 589 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 590 * @attr ref android.R.styleable#View_keepScreenOn 591 * @attr ref android.R.styleable#View_layerType 592 * @attr ref android.R.styleable#View_longClickable 593 * @attr ref android.R.styleable#View_minHeight 594 * @attr ref android.R.styleable#View_minWidth 595 * @attr ref android.R.styleable#View_nextFocusDown 596 * @attr ref android.R.styleable#View_nextFocusLeft 597 * @attr ref android.R.styleable#View_nextFocusRight 598 * @attr ref android.R.styleable#View_nextFocusUp 599 * @attr ref android.R.styleable#View_onClick 600 * @attr ref android.R.styleable#View_padding 601 * @attr ref android.R.styleable#View_paddingBottom 602 * @attr ref android.R.styleable#View_paddingLeft 603 * @attr ref android.R.styleable#View_paddingRight 604 * @attr ref android.R.styleable#View_paddingTop 605 * @attr ref android.R.styleable#View_saveEnabled 606 * @attr ref android.R.styleable#View_rotation 607 * @attr ref android.R.styleable#View_rotationX 608 * @attr ref android.R.styleable#View_rotationY 609 * @attr ref android.R.styleable#View_scaleX 610 * @attr ref android.R.styleable#View_scaleY 611 * @attr ref android.R.styleable#View_scrollX 612 * @attr ref android.R.styleable#View_scrollY 613 * @attr ref android.R.styleable#View_scrollbarSize 614 * @attr ref android.R.styleable#View_scrollbarStyle 615 * @attr ref android.R.styleable#View_scrollbars 616 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 617 * @attr ref android.R.styleable#View_scrollbarFadeDuration 618 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 619 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbVertical 621 * @attr ref android.R.styleable#View_scrollbarTrackVertical 622 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 624 * @attr ref android.R.styleable#View_soundEffectsEnabled 625 * @attr ref android.R.styleable#View_tag 626 * @attr ref android.R.styleable#View_transformPivotX 627 * @attr ref android.R.styleable#View_transformPivotY 628 * @attr ref android.R.styleable#View_translationX 629 * @attr ref android.R.styleable#View_translationY 630 * @attr ref android.R.styleable#View_visibility 631 * 632 * @see android.view.ViewGroup 633 */ 634public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 635 private static final boolean DBG = false; 636 637 /** 638 * The logging tag used by this class with android.util.Log. 639 */ 640 protected static final String VIEW_LOG_TAG = "View"; 641 642 /** 643 * Used to mark a View that has no ID. 644 */ 645 public static final int NO_ID = -1; 646 647 /** 648 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 649 * calling setFlags. 650 */ 651 private static final int NOT_FOCUSABLE = 0x00000000; 652 653 /** 654 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 655 * setFlags. 656 */ 657 private static final int FOCUSABLE = 0x00000001; 658 659 /** 660 * Mask for use with setFlags indicating bits used for focus. 661 */ 662 private static final int FOCUSABLE_MASK = 0x00000001; 663 664 /** 665 * This view will adjust its padding to fit sytem windows (e.g. status bar) 666 */ 667 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 668 669 /** 670 * This view is visible. Use with {@link #setVisibility}. 671 */ 672 public static final int VISIBLE = 0x00000000; 673 674 /** 675 * This view is invisible, but it still takes up space for layout purposes. 676 * Use with {@link #setVisibility}. 677 */ 678 public static final int INVISIBLE = 0x00000004; 679 680 /** 681 * This view is invisible, and it doesn't take any space for layout 682 * purposes. Use with {@link #setVisibility}. 683 */ 684 public static final int GONE = 0x00000008; 685 686 /** 687 * Mask for use with setFlags indicating bits used for visibility. 688 * {@hide} 689 */ 690 static final int VISIBILITY_MASK = 0x0000000C; 691 692 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 693 694 /** 695 * This view is enabled. Intrepretation varies by subclass. 696 * Use with ENABLED_MASK when calling setFlags. 697 * {@hide} 698 */ 699 static final int ENABLED = 0x00000000; 700 701 /** 702 * This view is disabled. Intrepretation varies by subclass. 703 * Use with ENABLED_MASK when calling setFlags. 704 * {@hide} 705 */ 706 static final int DISABLED = 0x00000020; 707 708 /** 709 * Mask for use with setFlags indicating bits used for indicating whether 710 * this view is enabled 711 * {@hide} 712 */ 713 static final int ENABLED_MASK = 0x00000020; 714 715 /** 716 * This view won't draw. {@link #onDraw} won't be called and further 717 * optimizations 718 * will be performed. It is okay to have this flag set and a background. 719 * Use with DRAW_MASK when calling setFlags. 720 * {@hide} 721 */ 722 static final int WILL_NOT_DRAW = 0x00000080; 723 724 /** 725 * Mask for use with setFlags indicating bits used for indicating whether 726 * this view is will draw 727 * {@hide} 728 */ 729 static final int DRAW_MASK = 0x00000080; 730 731 /** 732 * <p>This view doesn't show scrollbars.</p> 733 * {@hide} 734 */ 735 static final int SCROLLBARS_NONE = 0x00000000; 736 737 /** 738 * <p>This view shows horizontal scrollbars.</p> 739 * {@hide} 740 */ 741 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 742 743 /** 744 * <p>This view shows vertical scrollbars.</p> 745 * {@hide} 746 */ 747 static final int SCROLLBARS_VERTICAL = 0x00000200; 748 749 /** 750 * <p>Mask for use with setFlags indicating bits used for indicating which 751 * scrollbars are enabled.</p> 752 * {@hide} 753 */ 754 static final int SCROLLBARS_MASK = 0x00000300; 755 756 /** 757 * Indicates that the view should filter touches when its window is obscured. 758 * Refer to the class comments for more information about this security feature. 759 * {@hide} 760 */ 761 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 762 763 // note flag value 0x00000800 is now available for next flags... 764 765 /** 766 * <p>This view doesn't show fading edges.</p> 767 * {@hide} 768 */ 769 static final int FADING_EDGE_NONE = 0x00000000; 770 771 /** 772 * <p>This view shows horizontal fading edges.</p> 773 * {@hide} 774 */ 775 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 776 777 /** 778 * <p>This view shows vertical fading edges.</p> 779 * {@hide} 780 */ 781 static final int FADING_EDGE_VERTICAL = 0x00002000; 782 783 /** 784 * <p>Mask for use with setFlags indicating bits used for indicating which 785 * fading edges are enabled.</p> 786 * {@hide} 787 */ 788 static final int FADING_EDGE_MASK = 0x00003000; 789 790 /** 791 * <p>Indicates this view can be clicked. When clickable, a View reacts 792 * to clicks by notifying the OnClickListener.<p> 793 * {@hide} 794 */ 795 static final int CLICKABLE = 0x00004000; 796 797 /** 798 * <p>Indicates this view is caching its drawing into a bitmap.</p> 799 * {@hide} 800 */ 801 static final int DRAWING_CACHE_ENABLED = 0x00008000; 802 803 /** 804 * <p>Indicates that no icicle should be saved for this view.<p> 805 * {@hide} 806 */ 807 static final int SAVE_DISABLED = 0x000010000; 808 809 /** 810 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 811 * property.</p> 812 * {@hide} 813 */ 814 static final int SAVE_DISABLED_MASK = 0x000010000; 815 816 /** 817 * <p>Indicates that no drawing cache should ever be created for this view.<p> 818 * {@hide} 819 */ 820 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 821 822 /** 823 * <p>Indicates this view can take / keep focus when int touch mode.</p> 824 * {@hide} 825 */ 826 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 827 828 /** 829 * <p>Enables low quality mode for the drawing cache.</p> 830 */ 831 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 832 833 /** 834 * <p>Enables high quality mode for the drawing cache.</p> 835 */ 836 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 837 838 /** 839 * <p>Enables automatic quality mode for the drawing cache.</p> 840 */ 841 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 842 843 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 844 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 845 }; 846 847 /** 848 * <p>Mask for use with setFlags indicating bits used for the cache 849 * quality property.</p> 850 * {@hide} 851 */ 852 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 853 854 /** 855 * <p> 856 * Indicates this view can be long clicked. When long clickable, a View 857 * reacts to long clicks by notifying the OnLongClickListener or showing a 858 * context menu. 859 * </p> 860 * {@hide} 861 */ 862 static final int LONG_CLICKABLE = 0x00200000; 863 864 /** 865 * <p>Indicates that this view gets its drawable states from its direct parent 866 * and ignores its original internal states.</p> 867 * 868 * @hide 869 */ 870 static final int DUPLICATE_PARENT_STATE = 0x00400000; 871 872 /** 873 * The scrollbar style to display the scrollbars inside the content area, 874 * without increasing the padding. The scrollbars will be overlaid with 875 * translucency on the view's content. 876 */ 877 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 878 879 /** 880 * The scrollbar style to display the scrollbars inside the padded area, 881 * increasing the padding of the view. The scrollbars will not overlap the 882 * content area of the view. 883 */ 884 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 885 886 /** 887 * The scrollbar style to display the scrollbars at the edge of the view, 888 * without increasing the padding. The scrollbars will be overlaid with 889 * translucency. 890 */ 891 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 892 893 /** 894 * The scrollbar style to display the scrollbars at the edge of the view, 895 * increasing the padding of the view. The scrollbars will only overlap the 896 * background, if any. 897 */ 898 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 899 900 /** 901 * Mask to check if the scrollbar style is overlay or inset. 902 * {@hide} 903 */ 904 static final int SCROLLBARS_INSET_MASK = 0x01000000; 905 906 /** 907 * Mask to check if the scrollbar style is inside or outside. 908 * {@hide} 909 */ 910 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 911 912 /** 913 * Mask for scrollbar style. 914 * {@hide} 915 */ 916 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 917 918 /** 919 * View flag indicating that the screen should remain on while the 920 * window containing this view is visible to the user. This effectively 921 * takes care of automatically setting the WindowManager's 922 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 923 */ 924 public static final int KEEP_SCREEN_ON = 0x04000000; 925 926 /** 927 * View flag indicating whether this view should have sound effects enabled 928 * for events such as clicking and touching. 929 */ 930 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 931 932 /** 933 * View flag indicating whether this view should have haptic feedback 934 * enabled for events such as long presses. 935 */ 936 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 937 938 /** 939 * <p>Indicates that the view hierarchy should stop saving state when 940 * it reaches this view. If state saving is initiated immediately at 941 * the view, it will be allowed. 942 * {@hide} 943 */ 944 static final int PARENT_SAVE_DISABLED = 0x20000000; 945 946 /** 947 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 948 * {@hide} 949 */ 950 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 951 952 /** 953 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 954 * should add all focusable Views regardless if they are focusable in touch mode. 955 */ 956 public static final int FOCUSABLES_ALL = 0x00000000; 957 958 /** 959 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 960 * should add only Views focusable in touch mode. 961 */ 962 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 963 964 /** 965 * Use with {@link #focusSearch}. Move focus to the previous selectable 966 * item. 967 */ 968 public static final int FOCUS_BACKWARD = 0x00000001; 969 970 /** 971 * Use with {@link #focusSearch}. Move focus to the next selectable 972 * item. 973 */ 974 public static final int FOCUS_FORWARD = 0x00000002; 975 976 /** 977 * Use with {@link #focusSearch}. Move focus to the left. 978 */ 979 public static final int FOCUS_LEFT = 0x00000011; 980 981 /** 982 * Use with {@link #focusSearch}. Move focus up. 983 */ 984 public static final int FOCUS_UP = 0x00000021; 985 986 /** 987 * Use with {@link #focusSearch}. Move focus to the right. 988 */ 989 public static final int FOCUS_RIGHT = 0x00000042; 990 991 /** 992 * Use with {@link #focusSearch}. Move focus down. 993 */ 994 public static final int FOCUS_DOWN = 0x00000082; 995 996 /** 997 * Bits of {@link #getMeasuredWidthAndState()} and 998 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 999 */ 1000 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1001 1002 /** 1003 * Bits of {@link #getMeasuredWidthAndState()} and 1004 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1005 */ 1006 public static final int MEASURED_STATE_MASK = 0xff000000; 1007 1008 /** 1009 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1010 * for functions that combine both width and height into a single int, 1011 * such as {@link #getMeasuredState()} and the childState argument of 1012 * {@link #resolveSizeAndState(int, int, int)}. 1013 */ 1014 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1015 1016 /** 1017 * Bit of {@link #getMeasuredWidthAndState()} and 1018 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1019 * is smaller that the space the view would like to have. 1020 */ 1021 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1022 1023 /** 1024 * Base View state sets 1025 */ 1026 // Singles 1027 /** 1028 * Indicates the view has no states set. States are used with 1029 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1030 * view depending on its state. 1031 * 1032 * @see android.graphics.drawable.Drawable 1033 * @see #getDrawableState() 1034 */ 1035 protected static final int[] EMPTY_STATE_SET; 1036 /** 1037 * Indicates the view is enabled. States are used with 1038 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1039 * view depending on its state. 1040 * 1041 * @see android.graphics.drawable.Drawable 1042 * @see #getDrawableState() 1043 */ 1044 protected static final int[] ENABLED_STATE_SET; 1045 /** 1046 * Indicates the view is focused. States are used with 1047 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1048 * view depending on its state. 1049 * 1050 * @see android.graphics.drawable.Drawable 1051 * @see #getDrawableState() 1052 */ 1053 protected static final int[] FOCUSED_STATE_SET; 1054 /** 1055 * Indicates the view is selected. States are used with 1056 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1057 * view depending on its state. 1058 * 1059 * @see android.graphics.drawable.Drawable 1060 * @see #getDrawableState() 1061 */ 1062 protected static final int[] SELECTED_STATE_SET; 1063 /** 1064 * Indicates the view is pressed. States are used with 1065 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1066 * view depending on its state. 1067 * 1068 * @see android.graphics.drawable.Drawable 1069 * @see #getDrawableState() 1070 * @hide 1071 */ 1072 protected static final int[] PRESSED_STATE_SET; 1073 /** 1074 * Indicates the view's window has focus. States are used with 1075 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1076 * view depending on its state. 1077 * 1078 * @see android.graphics.drawable.Drawable 1079 * @see #getDrawableState() 1080 */ 1081 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1082 // Doubles 1083 /** 1084 * Indicates the view is enabled and has the focus. 1085 * 1086 * @see #ENABLED_STATE_SET 1087 * @see #FOCUSED_STATE_SET 1088 */ 1089 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1090 /** 1091 * Indicates the view is enabled and selected. 1092 * 1093 * @see #ENABLED_STATE_SET 1094 * @see #SELECTED_STATE_SET 1095 */ 1096 protected static final int[] ENABLED_SELECTED_STATE_SET; 1097 /** 1098 * Indicates the view is enabled and that its window has focus. 1099 * 1100 * @see #ENABLED_STATE_SET 1101 * @see #WINDOW_FOCUSED_STATE_SET 1102 */ 1103 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1104 /** 1105 * Indicates the view is focused and selected. 1106 * 1107 * @see #FOCUSED_STATE_SET 1108 * @see #SELECTED_STATE_SET 1109 */ 1110 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1111 /** 1112 * Indicates the view has the focus and that its window has the focus. 1113 * 1114 * @see #FOCUSED_STATE_SET 1115 * @see #WINDOW_FOCUSED_STATE_SET 1116 */ 1117 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1118 /** 1119 * Indicates the view is selected and that its window has the focus. 1120 * 1121 * @see #SELECTED_STATE_SET 1122 * @see #WINDOW_FOCUSED_STATE_SET 1123 */ 1124 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1125 // Triples 1126 /** 1127 * Indicates the view is enabled, focused and selected. 1128 * 1129 * @see #ENABLED_STATE_SET 1130 * @see #FOCUSED_STATE_SET 1131 * @see #SELECTED_STATE_SET 1132 */ 1133 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1134 /** 1135 * Indicates the view is enabled, focused and its window has the focus. 1136 * 1137 * @see #ENABLED_STATE_SET 1138 * @see #FOCUSED_STATE_SET 1139 * @see #WINDOW_FOCUSED_STATE_SET 1140 */ 1141 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1142 /** 1143 * Indicates the view is enabled, selected and its window has the focus. 1144 * 1145 * @see #ENABLED_STATE_SET 1146 * @see #SELECTED_STATE_SET 1147 * @see #WINDOW_FOCUSED_STATE_SET 1148 */ 1149 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1150 /** 1151 * Indicates the view is focused, selected and its window has the focus. 1152 * 1153 * @see #FOCUSED_STATE_SET 1154 * @see #SELECTED_STATE_SET 1155 * @see #WINDOW_FOCUSED_STATE_SET 1156 */ 1157 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1158 /** 1159 * Indicates the view is enabled, focused, selected and its window 1160 * has the focus. 1161 * 1162 * @see #ENABLED_STATE_SET 1163 * @see #FOCUSED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 * @see #WINDOW_FOCUSED_STATE_SET 1166 */ 1167 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1168 /** 1169 * Indicates the view is pressed and its window has the focus. 1170 * 1171 * @see #PRESSED_STATE_SET 1172 * @see #WINDOW_FOCUSED_STATE_SET 1173 */ 1174 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1175 /** 1176 * Indicates the view is pressed and selected. 1177 * 1178 * @see #PRESSED_STATE_SET 1179 * @see #SELECTED_STATE_SET 1180 */ 1181 protected static final int[] PRESSED_SELECTED_STATE_SET; 1182 /** 1183 * Indicates the view is pressed, selected and its window has the focus. 1184 * 1185 * @see #PRESSED_STATE_SET 1186 * @see #SELECTED_STATE_SET 1187 * @see #WINDOW_FOCUSED_STATE_SET 1188 */ 1189 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1190 /** 1191 * Indicates the view is pressed and focused. 1192 * 1193 * @see #PRESSED_STATE_SET 1194 * @see #FOCUSED_STATE_SET 1195 */ 1196 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1197 /** 1198 * Indicates the view is pressed, focused and its window has the focus. 1199 * 1200 * @see #PRESSED_STATE_SET 1201 * @see #FOCUSED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is pressed, focused and selected. 1207 * 1208 * @see #PRESSED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1213 /** 1214 * Indicates the view is pressed, focused, selected and its window has the focus. 1215 * 1216 * @see #PRESSED_STATE_SET 1217 * @see #FOCUSED_STATE_SET 1218 * @see #SELECTED_STATE_SET 1219 * @see #WINDOW_FOCUSED_STATE_SET 1220 */ 1221 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1222 /** 1223 * Indicates the view is pressed and enabled. 1224 * 1225 * @see #PRESSED_STATE_SET 1226 * @see #ENABLED_STATE_SET 1227 */ 1228 protected static final int[] PRESSED_ENABLED_STATE_SET; 1229 /** 1230 * Indicates the view is pressed, enabled and its window has the focus. 1231 * 1232 * @see #PRESSED_STATE_SET 1233 * @see #ENABLED_STATE_SET 1234 * @see #WINDOW_FOCUSED_STATE_SET 1235 */ 1236 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1237 /** 1238 * Indicates the view is pressed, enabled and selected. 1239 * 1240 * @see #PRESSED_STATE_SET 1241 * @see #ENABLED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed, enabled, selected and its window has the 1247 * focus. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #ENABLED_STATE_SET 1251 * @see #SELECTED_STATE_SET 1252 * @see #WINDOW_FOCUSED_STATE_SET 1253 */ 1254 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1255 /** 1256 * Indicates the view is pressed, enabled and focused. 1257 * 1258 * @see #PRESSED_STATE_SET 1259 * @see #ENABLED_STATE_SET 1260 * @see #FOCUSED_STATE_SET 1261 */ 1262 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1263 /** 1264 * Indicates the view is pressed, enabled, focused and its window has the 1265 * focus. 1266 * 1267 * @see #PRESSED_STATE_SET 1268 * @see #ENABLED_STATE_SET 1269 * @see #FOCUSED_STATE_SET 1270 * @see #WINDOW_FOCUSED_STATE_SET 1271 */ 1272 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1273 /** 1274 * Indicates the view is pressed, enabled, focused and selected. 1275 * 1276 * @see #PRESSED_STATE_SET 1277 * @see #ENABLED_STATE_SET 1278 * @see #SELECTED_STATE_SET 1279 * @see #FOCUSED_STATE_SET 1280 */ 1281 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1282 /** 1283 * Indicates the view is pressed, enabled, focused, selected and its window 1284 * has the focus. 1285 * 1286 * @see #PRESSED_STATE_SET 1287 * @see #ENABLED_STATE_SET 1288 * @see #SELECTED_STATE_SET 1289 * @see #FOCUSED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1293 1294 /** 1295 * The order here is very important to {@link #getDrawableState()} 1296 */ 1297 private static final int[][] VIEW_STATE_SETS; 1298 1299 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1300 static final int VIEW_STATE_SELECTED = 1 << 1; 1301 static final int VIEW_STATE_FOCUSED = 1 << 2; 1302 static final int VIEW_STATE_ENABLED = 1 << 3; 1303 static final int VIEW_STATE_PRESSED = 1 << 4; 1304 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1305 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1306 1307 static final int[] VIEW_STATE_IDS = new int[] { 1308 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1309 R.attr.state_selected, VIEW_STATE_SELECTED, 1310 R.attr.state_focused, VIEW_STATE_FOCUSED, 1311 R.attr.state_enabled, VIEW_STATE_ENABLED, 1312 R.attr.state_pressed, VIEW_STATE_PRESSED, 1313 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1314 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1315 }; 1316 1317 static { 1318 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1319 throw new IllegalStateException( 1320 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1321 } 1322 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1323 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1324 int viewState = R.styleable.ViewDrawableStates[i]; 1325 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1326 if (VIEW_STATE_IDS[j] == viewState) { 1327 orderedIds[i * 2] = viewState; 1328 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1329 } 1330 } 1331 } 1332 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1333 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1334 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1335 int numBits = Integer.bitCount(i); 1336 int[] set = new int[numBits]; 1337 int pos = 0; 1338 for (int j = 0; j < orderedIds.length; j += 2) { 1339 if ((i & orderedIds[j+1]) != 0) { 1340 set[pos++] = orderedIds[j]; 1341 } 1342 } 1343 VIEW_STATE_SETS[i] = set; 1344 } 1345 1346 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1347 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1348 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1349 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1350 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1351 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1352 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1353 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1354 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1355 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1356 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1357 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1358 | VIEW_STATE_FOCUSED]; 1359 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1360 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1361 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1362 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1363 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1364 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1365 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1366 | VIEW_STATE_ENABLED]; 1367 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1368 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1369 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1370 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1371 | VIEW_STATE_ENABLED]; 1372 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1373 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1374 | VIEW_STATE_ENABLED]; 1375 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1376 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1377 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1378 1379 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1380 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1381 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1382 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1383 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1384 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1385 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1386 | VIEW_STATE_PRESSED]; 1387 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1388 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1389 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1390 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1391 | VIEW_STATE_PRESSED]; 1392 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1393 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1394 | VIEW_STATE_PRESSED]; 1395 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1396 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1397 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1398 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1399 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1400 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1401 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1402 | VIEW_STATE_PRESSED]; 1403 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1404 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1405 | VIEW_STATE_PRESSED]; 1406 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1407 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1408 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1409 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1410 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1411 | VIEW_STATE_PRESSED]; 1412 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1413 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1414 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1415 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1417 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1418 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1421 | VIEW_STATE_PRESSED]; 1422 } 1423 1424 /** 1425 * Used by views that contain lists of items. This state indicates that 1426 * the view is showing the last item. 1427 * @hide 1428 */ 1429 protected static final int[] LAST_STATE_SET = {R.attr.state_last}; 1430 /** 1431 * Used by views that contain lists of items. This state indicates that 1432 * the view is showing the first item. 1433 * @hide 1434 */ 1435 protected static final int[] FIRST_STATE_SET = {R.attr.state_first}; 1436 /** 1437 * Used by views that contain lists of items. This state indicates that 1438 * the view is showing the middle item. 1439 * @hide 1440 */ 1441 protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle}; 1442 /** 1443 * Used by views that contain lists of items. This state indicates that 1444 * the view is showing only one item. 1445 * @hide 1446 */ 1447 protected static final int[] SINGLE_STATE_SET = {R.attr.state_single}; 1448 /** 1449 * Used by views that contain lists of items. This state indicates that 1450 * the view is pressed and showing the last item. 1451 * @hide 1452 */ 1453 protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed}; 1454 /** 1455 * Used by views that contain lists of items. This state indicates that 1456 * the view is pressed and showing the first item. 1457 * @hide 1458 */ 1459 protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed}; 1460 /** 1461 * Used by views that contain lists of items. This state indicates that 1462 * the view is pressed and showing the middle item. 1463 * @hide 1464 */ 1465 protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed}; 1466 /** 1467 * Used by views that contain lists of items. This state indicates that 1468 * the view is pressed and showing only one item. 1469 * @hide 1470 */ 1471 protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed}; 1472 1473 /** 1474 * Temporary Rect currently for use in setBackground(). This will probably 1475 * be extended in the future to hold our own class with more than just 1476 * a Rect. :) 1477 */ 1478 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1479 1480 /** 1481 * Map used to store views' tags. 1482 */ 1483 private static WeakHashMap<View, SparseArray<Object>> sTags; 1484 1485 /** 1486 * Lock used to access sTags. 1487 */ 1488 private static final Object sTagsLock = new Object(); 1489 1490 /** 1491 * The animation currently associated with this view. 1492 * @hide 1493 */ 1494 protected Animation mCurrentAnimation = null; 1495 1496 /** 1497 * Width as measured during measure pass. 1498 * {@hide} 1499 */ 1500 @ViewDebug.ExportedProperty(category = "measurement") 1501 /*package*/ int mMeasuredWidth; 1502 1503 /** 1504 * Height as measured during measure pass. 1505 * {@hide} 1506 */ 1507 @ViewDebug.ExportedProperty(category = "measurement") 1508 /*package*/ int mMeasuredHeight; 1509 1510 /** 1511 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1512 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1513 * its display list. This flag, used only when hw accelerated, allows us to clear the 1514 * flag while retaining this information until it's needed (at getDisplayList() time and 1515 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1516 * 1517 * {@hide} 1518 */ 1519 boolean mRecreateDisplayList = false; 1520 1521 /** 1522 * The view's identifier. 1523 * {@hide} 1524 * 1525 * @see #setId(int) 1526 * @see #getId() 1527 */ 1528 @ViewDebug.ExportedProperty(resolveId = true) 1529 int mID = NO_ID; 1530 1531 /** 1532 * The view's tag. 1533 * {@hide} 1534 * 1535 * @see #setTag(Object) 1536 * @see #getTag() 1537 */ 1538 protected Object mTag; 1539 1540 // for mPrivateFlags: 1541 /** {@hide} */ 1542 static final int WANTS_FOCUS = 0x00000001; 1543 /** {@hide} */ 1544 static final int FOCUSED = 0x00000002; 1545 /** {@hide} */ 1546 static final int SELECTED = 0x00000004; 1547 /** {@hide} */ 1548 static final int IS_ROOT_NAMESPACE = 0x00000008; 1549 /** {@hide} */ 1550 static final int HAS_BOUNDS = 0x00000010; 1551 /** {@hide} */ 1552 static final int DRAWN = 0x00000020; 1553 /** 1554 * When this flag is set, this view is running an animation on behalf of its 1555 * children and should therefore not cancel invalidate requests, even if they 1556 * lie outside of this view's bounds. 1557 * 1558 * {@hide} 1559 */ 1560 static final int DRAW_ANIMATION = 0x00000040; 1561 /** {@hide} */ 1562 static final int SKIP_DRAW = 0x00000080; 1563 /** {@hide} */ 1564 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1565 /** {@hide} */ 1566 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1567 /** {@hide} */ 1568 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1569 /** {@hide} */ 1570 static final int MEASURED_DIMENSION_SET = 0x00000800; 1571 /** {@hide} */ 1572 static final int FORCE_LAYOUT = 0x00001000; 1573 /** {@hide} */ 1574 static final int LAYOUT_REQUIRED = 0x00002000; 1575 1576 private static final int PRESSED = 0x00004000; 1577 1578 /** {@hide} */ 1579 static final int DRAWING_CACHE_VALID = 0x00008000; 1580 /** 1581 * Flag used to indicate that this view should be drawn once more (and only once 1582 * more) after its animation has completed. 1583 * {@hide} 1584 */ 1585 static final int ANIMATION_STARTED = 0x00010000; 1586 1587 private static final int SAVE_STATE_CALLED = 0x00020000; 1588 1589 /** 1590 * Indicates that the View returned true when onSetAlpha() was called and that 1591 * the alpha must be restored. 1592 * {@hide} 1593 */ 1594 static final int ALPHA_SET = 0x00040000; 1595 1596 /** 1597 * Set by {@link #setScrollContainer(boolean)}. 1598 */ 1599 static final int SCROLL_CONTAINER = 0x00080000; 1600 1601 /** 1602 * Set by {@link #setScrollContainer(boolean)}. 1603 */ 1604 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1605 1606 /** 1607 * View flag indicating whether this view was invalidated (fully or partially.) 1608 * 1609 * @hide 1610 */ 1611 static final int DIRTY = 0x00200000; 1612 1613 /** 1614 * View flag indicating whether this view was invalidated by an opaque 1615 * invalidate request. 1616 * 1617 * @hide 1618 */ 1619 static final int DIRTY_OPAQUE = 0x00400000; 1620 1621 /** 1622 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1623 * 1624 * @hide 1625 */ 1626 static final int DIRTY_MASK = 0x00600000; 1627 1628 /** 1629 * Indicates whether the background is opaque. 1630 * 1631 * @hide 1632 */ 1633 static final int OPAQUE_BACKGROUND = 0x00800000; 1634 1635 /** 1636 * Indicates whether the scrollbars are opaque. 1637 * 1638 * @hide 1639 */ 1640 static final int OPAQUE_SCROLLBARS = 0x01000000; 1641 1642 /** 1643 * Indicates whether the view is opaque. 1644 * 1645 * @hide 1646 */ 1647 static final int OPAQUE_MASK = 0x01800000; 1648 1649 /** 1650 * Indicates a prepressed state; 1651 * the short time between ACTION_DOWN and recognizing 1652 * a 'real' press. Prepressed is used to recognize quick taps 1653 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1654 * 1655 * @hide 1656 */ 1657 private static final int PREPRESSED = 0x02000000; 1658 1659 /** 1660 * Indicates whether the view is temporarily detached. 1661 * 1662 * @hide 1663 */ 1664 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1665 1666 /** 1667 * Indicates that we should awaken scroll bars once attached 1668 * 1669 * @hide 1670 */ 1671 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1672 1673 /** 1674 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1675 * for transform operations 1676 * 1677 * @hide 1678 */ 1679 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1680 1681 /** {@hide} */ 1682 static final int ACTIVATED = 0x40000000; 1683 1684 /** 1685 * Indicates that this view was specifically invalidated, not just dirtied because some 1686 * child view was invalidated. The flag is used to determine when we need to recreate 1687 * a view's display list (as opposed to just returning a reference to its existing 1688 * display list). 1689 * 1690 * @hide 1691 */ 1692 static final int INVALIDATED = 0x80000000; 1693 1694 /** 1695 * Always allow a user to over-scroll this view, provided it is a 1696 * view that can scroll. 1697 * 1698 * @see #getOverScrollMode() 1699 * @see #setOverScrollMode(int) 1700 */ 1701 public static final int OVER_SCROLL_ALWAYS = 0; 1702 1703 /** 1704 * Allow a user to over-scroll this view only if the content is large 1705 * enough to meaningfully scroll, provided it is a view that can scroll. 1706 * 1707 * @see #getOverScrollMode() 1708 * @see #setOverScrollMode(int) 1709 */ 1710 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1711 1712 /** 1713 * Never allow a user to over-scroll this view. 1714 * 1715 * @see #getOverScrollMode() 1716 * @see #setOverScrollMode(int) 1717 */ 1718 public static final int OVER_SCROLL_NEVER = 2; 1719 1720 /** 1721 * View has requested the status bar to be visible (the default). 1722 * 1723 * @see #setSystemUiVisibility(int) 1724 */ 1725 public static final int STATUS_BAR_VISIBLE = 0; 1726 1727 /** 1728 * View has requested the status bar to be visible (the default). 1729 * 1730 * @see #setSystemUiVisibility(int) 1731 */ 1732 public static final int STATUS_BAR_HIDDEN = 0x00000001; 1733 1734 /** 1735 * Controls the over-scroll mode for this view. 1736 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1737 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1738 * and {@link #OVER_SCROLL_NEVER}. 1739 */ 1740 private int mOverScrollMode; 1741 1742 /** 1743 * The parent this view is attached to. 1744 * {@hide} 1745 * 1746 * @see #getParent() 1747 */ 1748 protected ViewParent mParent; 1749 1750 /** 1751 * {@hide} 1752 */ 1753 AttachInfo mAttachInfo; 1754 1755 /** 1756 * {@hide} 1757 */ 1758 @ViewDebug.ExportedProperty(flagMapping = { 1759 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1760 name = "FORCE_LAYOUT"), 1761 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1762 name = "LAYOUT_REQUIRED"), 1763 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1764 name = "DRAWING_CACHE_INVALID", outputIf = false), 1765 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1766 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1767 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1768 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1769 }) 1770 int mPrivateFlags; 1771 1772 /** 1773 * This view's request for the visibility of the status bar. 1774 * @hide 1775 */ 1776 int mSystemUiVisibility; 1777 1778 /** 1779 * Count of how many windows this view has been attached to. 1780 */ 1781 int mWindowAttachCount; 1782 1783 /** 1784 * The layout parameters associated with this view and used by the parent 1785 * {@link android.view.ViewGroup} to determine how this view should be 1786 * laid out. 1787 * {@hide} 1788 */ 1789 protected ViewGroup.LayoutParams mLayoutParams; 1790 1791 /** 1792 * The view flags hold various views states. 1793 * {@hide} 1794 */ 1795 @ViewDebug.ExportedProperty 1796 int mViewFlags; 1797 1798 /** 1799 * The transform matrix for the View. This transform is calculated internally 1800 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1801 * is used by default. Do *not* use this variable directly; instead call 1802 * getMatrix(), which will automatically recalculate the matrix if necessary 1803 * to get the correct matrix based on the latest rotation and scale properties. 1804 */ 1805 private final Matrix mMatrix = new Matrix(); 1806 1807 /** 1808 * The transform matrix for the View. This transform is calculated internally 1809 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1810 * is used by default. Do *not* use this variable directly; instead call 1811 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1812 * to get the correct matrix based on the latest rotation and scale properties. 1813 */ 1814 private Matrix mInverseMatrix; 1815 1816 /** 1817 * An internal variable that tracks whether we need to recalculate the 1818 * transform matrix, based on whether the rotation or scaleX/Y properties 1819 * have changed since the matrix was last calculated. 1820 */ 1821 private boolean mMatrixDirty = false; 1822 1823 /** 1824 * An internal variable that tracks whether we need to recalculate the 1825 * transform matrix, based on whether the rotation or scaleX/Y properties 1826 * have changed since the matrix was last calculated. 1827 */ 1828 private boolean mInverseMatrixDirty = true; 1829 1830 /** 1831 * A variable that tracks whether we need to recalculate the 1832 * transform matrix, based on whether the rotation or scaleX/Y properties 1833 * have changed since the matrix was last calculated. This variable 1834 * is only valid after a call to updateMatrix() or to a function that 1835 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1836 */ 1837 private boolean mMatrixIsIdentity = true; 1838 1839 /** 1840 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1841 */ 1842 private Camera mCamera = null; 1843 1844 /** 1845 * This matrix is used when computing the matrix for 3D rotations. 1846 */ 1847 private Matrix matrix3D = null; 1848 1849 /** 1850 * These prev values are used to recalculate a centered pivot point when necessary. The 1851 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1852 * set), so thes values are only used then as well. 1853 */ 1854 private int mPrevWidth = -1; 1855 private int mPrevHeight = -1; 1856 1857 private boolean mLastIsOpaque; 1858 1859 /** 1860 * Convenience value to check for float values that are close enough to zero to be considered 1861 * zero. 1862 */ 1863 private static final float NONZERO_EPSILON = .001f; 1864 1865 /** 1866 * The degrees rotation around the vertical axis through the pivot point. 1867 */ 1868 @ViewDebug.ExportedProperty 1869 private float mRotationY = 0f; 1870 1871 /** 1872 * The degrees rotation around the horizontal axis through the pivot point. 1873 */ 1874 @ViewDebug.ExportedProperty 1875 private float mRotationX = 0f; 1876 1877 /** 1878 * The degrees rotation around the pivot point. 1879 */ 1880 @ViewDebug.ExportedProperty 1881 private float mRotation = 0f; 1882 1883 /** 1884 * The amount of translation of the object away from its left property (post-layout). 1885 */ 1886 @ViewDebug.ExportedProperty 1887 private float mTranslationX = 0f; 1888 1889 /** 1890 * The amount of translation of the object away from its top property (post-layout). 1891 */ 1892 @ViewDebug.ExportedProperty 1893 private float mTranslationY = 0f; 1894 1895 /** 1896 * The amount of scale in the x direction around the pivot point. A 1897 * value of 1 means no scaling is applied. 1898 */ 1899 @ViewDebug.ExportedProperty 1900 private float mScaleX = 1f; 1901 1902 /** 1903 * The amount of scale in the y direction around the pivot point. A 1904 * value of 1 means no scaling is applied. 1905 */ 1906 @ViewDebug.ExportedProperty 1907 private float mScaleY = 1f; 1908 1909 /** 1910 * The amount of scale in the x direction around the pivot point. A 1911 * value of 1 means no scaling is applied. 1912 */ 1913 @ViewDebug.ExportedProperty 1914 private float mPivotX = 0f; 1915 1916 /** 1917 * The amount of scale in the y direction around the pivot point. A 1918 * value of 1 means no scaling is applied. 1919 */ 1920 @ViewDebug.ExportedProperty 1921 private float mPivotY = 0f; 1922 1923 /** 1924 * The opacity of the View. This is a value from 0 to 1, where 0 means 1925 * completely transparent and 1 means completely opaque. 1926 */ 1927 @ViewDebug.ExportedProperty 1928 private float mAlpha = 1f; 1929 1930 /** 1931 * The distance in pixels from the left edge of this view's parent 1932 * to the left edge of this view. 1933 * {@hide} 1934 */ 1935 @ViewDebug.ExportedProperty(category = "layout") 1936 protected int mLeft; 1937 /** 1938 * The distance in pixels from the left edge of this view's parent 1939 * to the right edge of this view. 1940 * {@hide} 1941 */ 1942 @ViewDebug.ExportedProperty(category = "layout") 1943 protected int mRight; 1944 /** 1945 * The distance in pixels from the top edge of this view's parent 1946 * to the top edge of this view. 1947 * {@hide} 1948 */ 1949 @ViewDebug.ExportedProperty(category = "layout") 1950 protected int mTop; 1951 /** 1952 * The distance in pixels from the top edge of this view's parent 1953 * to the bottom edge of this view. 1954 * {@hide} 1955 */ 1956 @ViewDebug.ExportedProperty(category = "layout") 1957 protected int mBottom; 1958 1959 /** 1960 * The offset, in pixels, by which the content of this view is scrolled 1961 * horizontally. 1962 * {@hide} 1963 */ 1964 @ViewDebug.ExportedProperty(category = "scrolling") 1965 protected int mScrollX; 1966 /** 1967 * The offset, in pixels, by which the content of this view is scrolled 1968 * vertically. 1969 * {@hide} 1970 */ 1971 @ViewDebug.ExportedProperty(category = "scrolling") 1972 protected int mScrollY; 1973 1974 /** 1975 * The left padding in pixels, that is the distance in pixels between the 1976 * left edge of this view and the left edge of its content. 1977 * {@hide} 1978 */ 1979 @ViewDebug.ExportedProperty(category = "padding") 1980 protected int mPaddingLeft; 1981 /** 1982 * The right padding in pixels, that is the distance in pixels between the 1983 * right edge of this view and the right edge of its content. 1984 * {@hide} 1985 */ 1986 @ViewDebug.ExportedProperty(category = "padding") 1987 protected int mPaddingRight; 1988 /** 1989 * The top padding in pixels, that is the distance in pixels between the 1990 * top edge of this view and the top edge of its content. 1991 * {@hide} 1992 */ 1993 @ViewDebug.ExportedProperty(category = "padding") 1994 protected int mPaddingTop; 1995 /** 1996 * The bottom padding in pixels, that is the distance in pixels between the 1997 * bottom edge of this view and the bottom edge of its content. 1998 * {@hide} 1999 */ 2000 @ViewDebug.ExportedProperty(category = "padding") 2001 protected int mPaddingBottom; 2002 2003 /** 2004 * Briefly describes the view and is primarily used for accessibility support. 2005 */ 2006 private CharSequence mContentDescription; 2007 2008 /** 2009 * Cache the paddingRight set by the user to append to the scrollbar's size. 2010 */ 2011 @ViewDebug.ExportedProperty(category = "padding") 2012 int mUserPaddingRight; 2013 2014 /** 2015 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2016 */ 2017 @ViewDebug.ExportedProperty(category = "padding") 2018 int mUserPaddingBottom; 2019 2020 /** 2021 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2022 */ 2023 @ViewDebug.ExportedProperty(category = "padding") 2024 int mUserPaddingLeft; 2025 2026 /** 2027 * @hide 2028 */ 2029 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2030 /** 2031 * @hide 2032 */ 2033 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2034 2035 private Resources mResources = null; 2036 2037 private Drawable mBGDrawable; 2038 2039 private int mBackgroundResource; 2040 private boolean mBackgroundSizeChanged; 2041 2042 /** 2043 * Listener used to dispatch focus change events. 2044 * This field should be made private, so it is hidden from the SDK. 2045 * {@hide} 2046 */ 2047 protected OnFocusChangeListener mOnFocusChangeListener; 2048 2049 /** 2050 * Listeners for layout change events. 2051 */ 2052 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2053 2054 /** 2055 * Listener used to dispatch click events. 2056 * This field should be made private, so it is hidden from the SDK. 2057 * {@hide} 2058 */ 2059 protected OnClickListener mOnClickListener; 2060 2061 /** 2062 * Listener used to dispatch long click events. 2063 * This field should be made private, so it is hidden from the SDK. 2064 * {@hide} 2065 */ 2066 protected OnLongClickListener mOnLongClickListener; 2067 2068 /** 2069 * Listener used to build the context menu. 2070 * This field should be made private, so it is hidden from the SDK. 2071 * {@hide} 2072 */ 2073 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2074 2075 private OnKeyListener mOnKeyListener; 2076 2077 private OnTouchListener mOnTouchListener; 2078 2079 private OnDragListener mOnDragListener; 2080 2081 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2082 2083 /** 2084 * The application environment this view lives in. 2085 * This field should be made private, so it is hidden from the SDK. 2086 * {@hide} 2087 */ 2088 protected Context mContext; 2089 2090 private ScrollabilityCache mScrollCache; 2091 2092 private int[] mDrawableState = null; 2093 2094 private Bitmap mDrawingCache; 2095 private Bitmap mUnscaledDrawingCache; 2096 private DisplayList mDisplayList; 2097 private HardwareLayer mHardwareLayer; 2098 2099 /** 2100 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2101 * the user may specify which view to go to next. 2102 */ 2103 private int mNextFocusLeftId = View.NO_ID; 2104 2105 /** 2106 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2107 * the user may specify which view to go to next. 2108 */ 2109 private int mNextFocusRightId = View.NO_ID; 2110 2111 /** 2112 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2113 * the user may specify which view to go to next. 2114 */ 2115 private int mNextFocusUpId = View.NO_ID; 2116 2117 /** 2118 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2119 * the user may specify which view to go to next. 2120 */ 2121 private int mNextFocusDownId = View.NO_ID; 2122 2123 /** 2124 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2125 * the user may specify which view to go to next. 2126 */ 2127 int mNextFocusForwardId = View.NO_ID; 2128 2129 private CheckForLongPress mPendingCheckForLongPress; 2130 private CheckForTap mPendingCheckForTap = null; 2131 private PerformClick mPerformClick; 2132 2133 private UnsetPressedState mUnsetPressedState; 2134 2135 /** 2136 * Whether the long press's action has been invoked. The tap's action is invoked on the 2137 * up event while a long press is invoked as soon as the long press duration is reached, so 2138 * a long press could be performed before the tap is checked, in which case the tap's action 2139 * should not be invoked. 2140 */ 2141 private boolean mHasPerformedLongPress; 2142 2143 /** 2144 * The minimum height of the view. We'll try our best to have the height 2145 * of this view to at least this amount. 2146 */ 2147 @ViewDebug.ExportedProperty(category = "measurement") 2148 private int mMinHeight; 2149 2150 /** 2151 * The minimum width of the view. We'll try our best to have the width 2152 * of this view to at least this amount. 2153 */ 2154 @ViewDebug.ExportedProperty(category = "measurement") 2155 private int mMinWidth; 2156 2157 /** 2158 * The delegate to handle touch events that are physically in this view 2159 * but should be handled by another view. 2160 */ 2161 private TouchDelegate mTouchDelegate = null; 2162 2163 /** 2164 * Solid color to use as a background when creating the drawing cache. Enables 2165 * the cache to use 16 bit bitmaps instead of 32 bit. 2166 */ 2167 private int mDrawingCacheBackgroundColor = 0; 2168 2169 /** 2170 * Special tree observer used when mAttachInfo is null. 2171 */ 2172 private ViewTreeObserver mFloatingTreeObserver; 2173 2174 /** 2175 * Cache the touch slop from the context that created the view. 2176 */ 2177 private int mTouchSlop; 2178 2179 /** 2180 * Cache drag/drop state 2181 * 2182 */ 2183 boolean mCanAcceptDrop; 2184 2185 /** 2186 * Flag indicating that a drag can cross window boundaries 2187 * @hide 2188 */ 2189 public static final int DRAG_FLAG_GLOBAL = 1; 2190 2191 /** 2192 * Position of the vertical scroll bar. 2193 */ 2194 private int mVerticalScrollbarPosition; 2195 2196 /** 2197 * Position the scroll bar at the default position as determined by the system. 2198 */ 2199 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2200 2201 /** 2202 * Position the scroll bar along the left edge. 2203 */ 2204 public static final int SCROLLBAR_POSITION_LEFT = 1; 2205 2206 /** 2207 * Position the scroll bar along the right edge. 2208 */ 2209 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2210 2211 /** 2212 * Indicates that the view does not have a layer. 2213 * 2214 * @see #getLayerType() 2215 * @see #setLayerType(int, android.graphics.Paint) 2216 * @see #LAYER_TYPE_SOFTWARE 2217 * @see #LAYER_TYPE_HARDWARE 2218 */ 2219 public static final int LAYER_TYPE_NONE = 0; 2220 2221 /** 2222 * <p>Indicates that the view has a software layer. A software layer is backed 2223 * by a bitmap and causes the view to be rendered using Android's software 2224 * rendering pipeline, even if hardware acceleration is enabled.</p> 2225 * 2226 * <p>Software layers have various usages:</p> 2227 * <p>When the application is not using hardware acceleration, a software layer 2228 * is useful to apply a specific color filter and/or blending mode and/or 2229 * translucency to a view and all its children.</p> 2230 * <p>When the application is using hardware acceleration, a software layer 2231 * is useful to render drawing primitives not supported by the hardware 2232 * accelerated pipeline. It can also be used to cache a complex view tree 2233 * into a texture and reduce the complexity of drawing operations. For instance, 2234 * when animating a complex view tree with a translation, a software layer can 2235 * be used to render the view tree only once.</p> 2236 * <p>Software layers should be avoided when the affected view tree updates 2237 * often. Every update will require to re-render the software layer, which can 2238 * potentially be slow (particularly when hardware acceleration is turned on 2239 * since the layer will have to be uploaded into a hardware texture after every 2240 * update.)</p> 2241 * 2242 * @see #getLayerType() 2243 * @see #setLayerType(int, android.graphics.Paint) 2244 * @see #LAYER_TYPE_NONE 2245 * @see #LAYER_TYPE_HARDWARE 2246 */ 2247 public static final int LAYER_TYPE_SOFTWARE = 1; 2248 2249 /** 2250 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2251 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2252 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2253 * rendering pipeline, but only if hardware acceleration is turned on for the 2254 * view hierarchy. When hardware acceleration is turned off, hardware layers 2255 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2256 * 2257 * <p>A hardware layer is useful to apply a specific color filter and/or 2258 * blending mode and/or translucency to a view and all its children.</p> 2259 * <p>A hardware layer can be used to cache a complex view tree into a 2260 * texture and reduce the complexity of drawing operations. For instance, 2261 * when animating a complex view tree with a translation, a hardware layer can 2262 * be used to render the view tree only once.</p> 2263 * <p>A hardware layer can also be used to increase the rendering quality when 2264 * rotation transformations are applied on a view. It can also be used to 2265 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2266 * 2267 * @see #getLayerType() 2268 * @see #setLayerType(int, android.graphics.Paint) 2269 * @see #LAYER_TYPE_NONE 2270 * @see #LAYER_TYPE_SOFTWARE 2271 */ 2272 public static final int LAYER_TYPE_HARDWARE = 2; 2273 2274 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2275 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2276 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2277 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2278 }) 2279 int mLayerType = LAYER_TYPE_NONE; 2280 Paint mLayerPaint; 2281 2282 /** 2283 * Simple constructor to use when creating a view from code. 2284 * 2285 * @param context The Context the view is running in, through which it can 2286 * access the current theme, resources, etc. 2287 */ 2288 public View(Context context) { 2289 mContext = context; 2290 mResources = context != null ? context.getResources() : null; 2291 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2292 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2293 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2294 } 2295 2296 /** 2297 * Constructor that is called when inflating a view from XML. This is called 2298 * when a view is being constructed from an XML file, supplying attributes 2299 * that were specified in the XML file. This version uses a default style of 2300 * 0, so the only attribute values applied are those in the Context's Theme 2301 * and the given AttributeSet. 2302 * 2303 * <p> 2304 * The method onFinishInflate() will be called after all children have been 2305 * added. 2306 * 2307 * @param context The Context the view is running in, through which it can 2308 * access the current theme, resources, etc. 2309 * @param attrs The attributes of the XML tag that is inflating the view. 2310 * @see #View(Context, AttributeSet, int) 2311 */ 2312 public View(Context context, AttributeSet attrs) { 2313 this(context, attrs, 0); 2314 } 2315 2316 /** 2317 * Perform inflation from XML and apply a class-specific base style. This 2318 * constructor of View allows subclasses to use their own base style when 2319 * they are inflating. For example, a Button class's constructor would call 2320 * this version of the super class constructor and supply 2321 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2322 * the theme's button style to modify all of the base view attributes (in 2323 * particular its background) as well as the Button class's attributes. 2324 * 2325 * @param context The Context the view is running in, through which it can 2326 * access the current theme, resources, etc. 2327 * @param attrs The attributes of the XML tag that is inflating the view. 2328 * @param defStyle The default style to apply to this view. If 0, no style 2329 * will be applied (beyond what is included in the theme). This may 2330 * either be an attribute resource, whose value will be retrieved 2331 * from the current theme, or an explicit style resource. 2332 * @see #View(Context, AttributeSet) 2333 */ 2334 public View(Context context, AttributeSet attrs, int defStyle) { 2335 this(context); 2336 2337 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2338 defStyle, 0); 2339 2340 Drawable background = null; 2341 2342 int leftPadding = -1; 2343 int topPadding = -1; 2344 int rightPadding = -1; 2345 int bottomPadding = -1; 2346 2347 int padding = -1; 2348 2349 int viewFlagValues = 0; 2350 int viewFlagMasks = 0; 2351 2352 boolean setScrollContainer = false; 2353 2354 int x = 0; 2355 int y = 0; 2356 2357 float tx = 0; 2358 float ty = 0; 2359 float rotation = 0; 2360 float rotationX = 0; 2361 float rotationY = 0; 2362 float sx = 1f; 2363 float sy = 1f; 2364 boolean transformSet = false; 2365 2366 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2367 2368 int overScrollMode = mOverScrollMode; 2369 final int N = a.getIndexCount(); 2370 for (int i = 0; i < N; i++) { 2371 int attr = a.getIndex(i); 2372 switch (attr) { 2373 case com.android.internal.R.styleable.View_background: 2374 background = a.getDrawable(attr); 2375 break; 2376 case com.android.internal.R.styleable.View_padding: 2377 padding = a.getDimensionPixelSize(attr, -1); 2378 break; 2379 case com.android.internal.R.styleable.View_paddingLeft: 2380 leftPadding = a.getDimensionPixelSize(attr, -1); 2381 break; 2382 case com.android.internal.R.styleable.View_paddingTop: 2383 topPadding = a.getDimensionPixelSize(attr, -1); 2384 break; 2385 case com.android.internal.R.styleable.View_paddingRight: 2386 rightPadding = a.getDimensionPixelSize(attr, -1); 2387 break; 2388 case com.android.internal.R.styleable.View_paddingBottom: 2389 bottomPadding = a.getDimensionPixelSize(attr, -1); 2390 break; 2391 case com.android.internal.R.styleable.View_scrollX: 2392 x = a.getDimensionPixelOffset(attr, 0); 2393 break; 2394 case com.android.internal.R.styleable.View_scrollY: 2395 y = a.getDimensionPixelOffset(attr, 0); 2396 break; 2397 case com.android.internal.R.styleable.View_alpha: 2398 setAlpha(a.getFloat(attr, 1f)); 2399 break; 2400 case com.android.internal.R.styleable.View_transformPivotX: 2401 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2402 break; 2403 case com.android.internal.R.styleable.View_transformPivotY: 2404 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2405 break; 2406 case com.android.internal.R.styleable.View_translationX: 2407 tx = a.getDimensionPixelOffset(attr, 0); 2408 transformSet = true; 2409 break; 2410 case com.android.internal.R.styleable.View_translationY: 2411 ty = a.getDimensionPixelOffset(attr, 0); 2412 transformSet = true; 2413 break; 2414 case com.android.internal.R.styleable.View_rotation: 2415 rotation = a.getFloat(attr, 0); 2416 transformSet = true; 2417 break; 2418 case com.android.internal.R.styleable.View_rotationX: 2419 rotationX = a.getFloat(attr, 0); 2420 transformSet = true; 2421 break; 2422 case com.android.internal.R.styleable.View_rotationY: 2423 rotationY = a.getFloat(attr, 0); 2424 transformSet = true; 2425 break; 2426 case com.android.internal.R.styleable.View_scaleX: 2427 sx = a.getFloat(attr, 1f); 2428 transformSet = true; 2429 break; 2430 case com.android.internal.R.styleable.View_scaleY: 2431 sy = a.getFloat(attr, 1f); 2432 transformSet = true; 2433 break; 2434 case com.android.internal.R.styleable.View_id: 2435 mID = a.getResourceId(attr, NO_ID); 2436 break; 2437 case com.android.internal.R.styleable.View_tag: 2438 mTag = a.getText(attr); 2439 break; 2440 case com.android.internal.R.styleable.View_fitsSystemWindows: 2441 if (a.getBoolean(attr, false)) { 2442 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2443 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2444 } 2445 break; 2446 case com.android.internal.R.styleable.View_focusable: 2447 if (a.getBoolean(attr, false)) { 2448 viewFlagValues |= FOCUSABLE; 2449 viewFlagMasks |= FOCUSABLE_MASK; 2450 } 2451 break; 2452 case com.android.internal.R.styleable.View_focusableInTouchMode: 2453 if (a.getBoolean(attr, false)) { 2454 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2455 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2456 } 2457 break; 2458 case com.android.internal.R.styleable.View_clickable: 2459 if (a.getBoolean(attr, false)) { 2460 viewFlagValues |= CLICKABLE; 2461 viewFlagMasks |= CLICKABLE; 2462 } 2463 break; 2464 case com.android.internal.R.styleable.View_longClickable: 2465 if (a.getBoolean(attr, false)) { 2466 viewFlagValues |= LONG_CLICKABLE; 2467 viewFlagMasks |= LONG_CLICKABLE; 2468 } 2469 break; 2470 case com.android.internal.R.styleable.View_saveEnabled: 2471 if (!a.getBoolean(attr, true)) { 2472 viewFlagValues |= SAVE_DISABLED; 2473 viewFlagMasks |= SAVE_DISABLED_MASK; 2474 } 2475 break; 2476 case com.android.internal.R.styleable.View_duplicateParentState: 2477 if (a.getBoolean(attr, false)) { 2478 viewFlagValues |= DUPLICATE_PARENT_STATE; 2479 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2480 } 2481 break; 2482 case com.android.internal.R.styleable.View_visibility: 2483 final int visibility = a.getInt(attr, 0); 2484 if (visibility != 0) { 2485 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2486 viewFlagMasks |= VISIBILITY_MASK; 2487 } 2488 break; 2489 case com.android.internal.R.styleable.View_drawingCacheQuality: 2490 final int cacheQuality = a.getInt(attr, 0); 2491 if (cacheQuality != 0) { 2492 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2493 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2494 } 2495 break; 2496 case com.android.internal.R.styleable.View_contentDescription: 2497 mContentDescription = a.getString(attr); 2498 break; 2499 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2500 if (!a.getBoolean(attr, true)) { 2501 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2502 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2503 } 2504 break; 2505 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2506 if (!a.getBoolean(attr, true)) { 2507 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2508 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2509 } 2510 break; 2511 case R.styleable.View_scrollbars: 2512 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2513 if (scrollbars != SCROLLBARS_NONE) { 2514 viewFlagValues |= scrollbars; 2515 viewFlagMasks |= SCROLLBARS_MASK; 2516 initializeScrollbars(a); 2517 } 2518 break; 2519 case R.styleable.View_fadingEdge: 2520 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2521 if (fadingEdge != FADING_EDGE_NONE) { 2522 viewFlagValues |= fadingEdge; 2523 viewFlagMasks |= FADING_EDGE_MASK; 2524 initializeFadingEdge(a); 2525 } 2526 break; 2527 case R.styleable.View_scrollbarStyle: 2528 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2529 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2530 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2531 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2532 } 2533 break; 2534 case R.styleable.View_isScrollContainer: 2535 setScrollContainer = true; 2536 if (a.getBoolean(attr, false)) { 2537 setScrollContainer(true); 2538 } 2539 break; 2540 case com.android.internal.R.styleable.View_keepScreenOn: 2541 if (a.getBoolean(attr, false)) { 2542 viewFlagValues |= KEEP_SCREEN_ON; 2543 viewFlagMasks |= KEEP_SCREEN_ON; 2544 } 2545 break; 2546 case R.styleable.View_filterTouchesWhenObscured: 2547 if (a.getBoolean(attr, false)) { 2548 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2549 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2550 } 2551 break; 2552 case R.styleable.View_nextFocusLeft: 2553 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2554 break; 2555 case R.styleable.View_nextFocusRight: 2556 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2557 break; 2558 case R.styleable.View_nextFocusUp: 2559 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2560 break; 2561 case R.styleable.View_nextFocusDown: 2562 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2563 break; 2564 case R.styleable.View_nextFocusForward: 2565 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2566 break; 2567 case R.styleable.View_minWidth: 2568 mMinWidth = a.getDimensionPixelSize(attr, 0); 2569 break; 2570 case R.styleable.View_minHeight: 2571 mMinHeight = a.getDimensionPixelSize(attr, 0); 2572 break; 2573 case R.styleable.View_onClick: 2574 if (context.isRestricted()) { 2575 throw new IllegalStateException("The android:onClick attribute cannot " 2576 + "be used within a restricted context"); 2577 } 2578 2579 final String handlerName = a.getString(attr); 2580 if (handlerName != null) { 2581 setOnClickListener(new OnClickListener() { 2582 private Method mHandler; 2583 2584 public void onClick(View v) { 2585 if (mHandler == null) { 2586 try { 2587 mHandler = getContext().getClass().getMethod(handlerName, 2588 View.class); 2589 } catch (NoSuchMethodException e) { 2590 int id = getId(); 2591 String idText = id == NO_ID ? "" : " with id '" 2592 + getContext().getResources().getResourceEntryName( 2593 id) + "'"; 2594 throw new IllegalStateException("Could not find a method " + 2595 handlerName + "(View) in the activity " 2596 + getContext().getClass() + " for onClick handler" 2597 + " on view " + View.this.getClass() + idText, e); 2598 } 2599 } 2600 2601 try { 2602 mHandler.invoke(getContext(), View.this); 2603 } catch (IllegalAccessException e) { 2604 throw new IllegalStateException("Could not execute non " 2605 + "public method of the activity", e); 2606 } catch (InvocationTargetException e) { 2607 throw new IllegalStateException("Could not execute " 2608 + "method of the activity", e); 2609 } 2610 } 2611 }); 2612 } 2613 break; 2614 case R.styleable.View_overScrollMode: 2615 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2616 break; 2617 case R.styleable.View_verticalScrollbarPosition: 2618 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2619 break; 2620 case R.styleable.View_layerType: 2621 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2622 break; 2623 } 2624 } 2625 2626 setOverScrollMode(overScrollMode); 2627 2628 if (background != null) { 2629 setBackgroundDrawable(background); 2630 } 2631 2632 if (padding >= 0) { 2633 leftPadding = padding; 2634 topPadding = padding; 2635 rightPadding = padding; 2636 bottomPadding = padding; 2637 } 2638 2639 // If the user specified the padding (either with android:padding or 2640 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2641 // use the default padding or the padding from the background drawable 2642 // (stored at this point in mPadding*) 2643 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2644 topPadding >= 0 ? topPadding : mPaddingTop, 2645 rightPadding >= 0 ? rightPadding : mPaddingRight, 2646 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2647 2648 if (viewFlagMasks != 0) { 2649 setFlags(viewFlagValues, viewFlagMasks); 2650 } 2651 2652 // Needs to be called after mViewFlags is set 2653 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2654 recomputePadding(); 2655 } 2656 2657 if (x != 0 || y != 0) { 2658 scrollTo(x, y); 2659 } 2660 2661 if (transformSet) { 2662 setTranslationX(tx); 2663 setTranslationY(ty); 2664 setRotation(rotation); 2665 setRotationX(rotationX); 2666 setRotationY(rotationY); 2667 setScaleX(sx); 2668 setScaleY(sy); 2669 } 2670 2671 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2672 setScrollContainer(true); 2673 } 2674 2675 computeOpaqueFlags(); 2676 2677 a.recycle(); 2678 } 2679 2680 /** 2681 * Non-public constructor for use in testing 2682 */ 2683 View() { 2684 } 2685 2686 /** 2687 * <p> 2688 * Initializes the fading edges from a given set of styled attributes. This 2689 * method should be called by subclasses that need fading edges and when an 2690 * instance of these subclasses is created programmatically rather than 2691 * being inflated from XML. This method is automatically called when the XML 2692 * is inflated. 2693 * </p> 2694 * 2695 * @param a the styled attributes set to initialize the fading edges from 2696 */ 2697 protected void initializeFadingEdge(TypedArray a) { 2698 initScrollCache(); 2699 2700 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2701 R.styleable.View_fadingEdgeLength, 2702 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2703 } 2704 2705 /** 2706 * Returns the size of the vertical faded edges used to indicate that more 2707 * content in this view is visible. 2708 * 2709 * @return The size in pixels of the vertical faded edge or 0 if vertical 2710 * faded edges are not enabled for this view. 2711 * @attr ref android.R.styleable#View_fadingEdgeLength 2712 */ 2713 public int getVerticalFadingEdgeLength() { 2714 if (isVerticalFadingEdgeEnabled()) { 2715 ScrollabilityCache cache = mScrollCache; 2716 if (cache != null) { 2717 return cache.fadingEdgeLength; 2718 } 2719 } 2720 return 0; 2721 } 2722 2723 /** 2724 * Set the size of the faded edge used to indicate that more content in this 2725 * view is available. Will not change whether the fading edge is enabled; use 2726 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2727 * to enable the fading edge for the vertical or horizontal fading edges. 2728 * 2729 * @param length The size in pixels of the faded edge used to indicate that more 2730 * content in this view is visible. 2731 */ 2732 public void setFadingEdgeLength(int length) { 2733 initScrollCache(); 2734 mScrollCache.fadingEdgeLength = length; 2735 } 2736 2737 /** 2738 * Returns the size of the horizontal faded edges used to indicate that more 2739 * content in this view is visible. 2740 * 2741 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2742 * faded edges are not enabled for this view. 2743 * @attr ref android.R.styleable#View_fadingEdgeLength 2744 */ 2745 public int getHorizontalFadingEdgeLength() { 2746 if (isHorizontalFadingEdgeEnabled()) { 2747 ScrollabilityCache cache = mScrollCache; 2748 if (cache != null) { 2749 return cache.fadingEdgeLength; 2750 } 2751 } 2752 return 0; 2753 } 2754 2755 /** 2756 * Returns the width of the vertical scrollbar. 2757 * 2758 * @return The width in pixels of the vertical scrollbar or 0 if there 2759 * is no vertical scrollbar. 2760 */ 2761 public int getVerticalScrollbarWidth() { 2762 ScrollabilityCache cache = mScrollCache; 2763 if (cache != null) { 2764 ScrollBarDrawable scrollBar = cache.scrollBar; 2765 if (scrollBar != null) { 2766 int size = scrollBar.getSize(true); 2767 if (size <= 0) { 2768 size = cache.scrollBarSize; 2769 } 2770 return size; 2771 } 2772 return 0; 2773 } 2774 return 0; 2775 } 2776 2777 /** 2778 * Returns the height of the horizontal scrollbar. 2779 * 2780 * @return The height in pixels of the horizontal scrollbar or 0 if 2781 * there is no horizontal scrollbar. 2782 */ 2783 protected int getHorizontalScrollbarHeight() { 2784 ScrollabilityCache cache = mScrollCache; 2785 if (cache != null) { 2786 ScrollBarDrawable scrollBar = cache.scrollBar; 2787 if (scrollBar != null) { 2788 int size = scrollBar.getSize(false); 2789 if (size <= 0) { 2790 size = cache.scrollBarSize; 2791 } 2792 return size; 2793 } 2794 return 0; 2795 } 2796 return 0; 2797 } 2798 2799 /** 2800 * <p> 2801 * Initializes the scrollbars from a given set of styled attributes. This 2802 * method should be called by subclasses that need scrollbars and when an 2803 * instance of these subclasses is created programmatically rather than 2804 * being inflated from XML. This method is automatically called when the XML 2805 * is inflated. 2806 * </p> 2807 * 2808 * @param a the styled attributes set to initialize the scrollbars from 2809 */ 2810 protected void initializeScrollbars(TypedArray a) { 2811 initScrollCache(); 2812 2813 final ScrollabilityCache scrollabilityCache = mScrollCache; 2814 2815 if (scrollabilityCache.scrollBar == null) { 2816 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2817 } 2818 2819 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2820 2821 if (!fadeScrollbars) { 2822 scrollabilityCache.state = ScrollabilityCache.ON; 2823 } 2824 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2825 2826 2827 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2828 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2829 .getScrollBarFadeDuration()); 2830 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2831 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2832 ViewConfiguration.getScrollDefaultDelay()); 2833 2834 2835 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2836 com.android.internal.R.styleable.View_scrollbarSize, 2837 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2838 2839 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2840 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2841 2842 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2843 if (thumb != null) { 2844 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2845 } 2846 2847 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2848 false); 2849 if (alwaysDraw) { 2850 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2851 } 2852 2853 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2854 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2855 2856 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2857 if (thumb != null) { 2858 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2859 } 2860 2861 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2862 false); 2863 if (alwaysDraw) { 2864 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2865 } 2866 2867 // Re-apply user/background padding so that scrollbar(s) get added 2868 recomputePadding(); 2869 } 2870 2871 /** 2872 * <p> 2873 * Initalizes the scrollability cache if necessary. 2874 * </p> 2875 */ 2876 private void initScrollCache() { 2877 if (mScrollCache == null) { 2878 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2879 } 2880 } 2881 2882 /** 2883 * Set the position of the vertical scroll bar. Should be one of 2884 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 2885 * {@link #SCROLLBAR_POSITION_RIGHT}. 2886 * 2887 * @param position Where the vertical scroll bar should be positioned. 2888 */ 2889 public void setVerticalScrollbarPosition(int position) { 2890 if (mVerticalScrollbarPosition != position) { 2891 mVerticalScrollbarPosition = position; 2892 computeOpaqueFlags(); 2893 recomputePadding(); 2894 } 2895 } 2896 2897 /** 2898 * @return The position where the vertical scroll bar will show, if applicable. 2899 * @see #setVerticalScrollbarPosition(int) 2900 */ 2901 public int getVerticalScrollbarPosition() { 2902 return mVerticalScrollbarPosition; 2903 } 2904 2905 /** 2906 * Register a callback to be invoked when focus of this view changed. 2907 * 2908 * @param l The callback that will run. 2909 */ 2910 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2911 mOnFocusChangeListener = l; 2912 } 2913 2914 /** 2915 * Add a listener that will be called when the bounds of the view change due to 2916 * layout processing. 2917 * 2918 * @param listener The listener that will be called when layout bounds change. 2919 */ 2920 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 2921 if (mOnLayoutChangeListeners == null) { 2922 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 2923 } 2924 mOnLayoutChangeListeners.add(listener); 2925 } 2926 2927 /** 2928 * Remove a listener for layout changes. 2929 * 2930 * @param listener The listener for layout bounds change. 2931 */ 2932 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 2933 if (mOnLayoutChangeListeners == null) { 2934 return; 2935 } 2936 mOnLayoutChangeListeners.remove(listener); 2937 } 2938 2939 /** 2940 * Returns the focus-change callback registered for this view. 2941 * 2942 * @return The callback, or null if one is not registered. 2943 */ 2944 public OnFocusChangeListener getOnFocusChangeListener() { 2945 return mOnFocusChangeListener; 2946 } 2947 2948 /** 2949 * Register a callback to be invoked when this view is clicked. If this view is not 2950 * clickable, it becomes clickable. 2951 * 2952 * @param l The callback that will run 2953 * 2954 * @see #setClickable(boolean) 2955 */ 2956 public void setOnClickListener(OnClickListener l) { 2957 if (!isClickable()) { 2958 setClickable(true); 2959 } 2960 mOnClickListener = l; 2961 } 2962 2963 /** 2964 * Register a callback to be invoked when this view is clicked and held. If this view is not 2965 * long clickable, it becomes long clickable. 2966 * 2967 * @param l The callback that will run 2968 * 2969 * @see #setLongClickable(boolean) 2970 */ 2971 public void setOnLongClickListener(OnLongClickListener l) { 2972 if (!isLongClickable()) { 2973 setLongClickable(true); 2974 } 2975 mOnLongClickListener = l; 2976 } 2977 2978 /** 2979 * Register a callback to be invoked when the context menu for this view is 2980 * being built. If this view is not long clickable, it becomes long clickable. 2981 * 2982 * @param l The callback that will run 2983 * 2984 */ 2985 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 2986 if (!isLongClickable()) { 2987 setLongClickable(true); 2988 } 2989 mOnCreateContextMenuListener = l; 2990 } 2991 2992 /** 2993 * Call this view's OnClickListener, if it is defined. 2994 * 2995 * @return True there was an assigned OnClickListener that was called, false 2996 * otherwise is returned. 2997 */ 2998 public boolean performClick() { 2999 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3000 3001 if (mOnClickListener != null) { 3002 playSoundEffect(SoundEffectConstants.CLICK); 3003 mOnClickListener.onClick(this); 3004 return true; 3005 } 3006 3007 return false; 3008 } 3009 3010 /** 3011 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3012 * OnLongClickListener did not consume the event. 3013 * 3014 * @return True if one of the above receivers consumed the event, false otherwise. 3015 */ 3016 public boolean performLongClick() { 3017 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3018 3019 boolean handled = false; 3020 if (mOnLongClickListener != null) { 3021 handled = mOnLongClickListener.onLongClick(View.this); 3022 } 3023 if (!handled) { 3024 handled = showContextMenu(); 3025 } 3026 if (handled) { 3027 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3028 } 3029 return handled; 3030 } 3031 3032 /** 3033 * Bring up the context menu for this view. 3034 * 3035 * @return Whether a context menu was displayed. 3036 */ 3037 public boolean showContextMenu() { 3038 return getParent().showContextMenuForChild(this); 3039 } 3040 3041 /** 3042 * Start an action mode. 3043 * 3044 * @param callback Callback that will control the lifecycle of the action mode 3045 * @return The new action mode if it is started, null otherwise 3046 * 3047 * @see ActionMode 3048 */ 3049 public ActionMode startActionMode(ActionMode.Callback callback) { 3050 return getParent().startActionModeForChild(this, callback); 3051 } 3052 3053 /** 3054 * Register a callback to be invoked when a key is pressed in this view. 3055 * @param l the key listener to attach to this view 3056 */ 3057 public void setOnKeyListener(OnKeyListener l) { 3058 mOnKeyListener = l; 3059 } 3060 3061 /** 3062 * Register a callback to be invoked when a touch event is sent to this view. 3063 * @param l the touch listener to attach to this view 3064 */ 3065 public void setOnTouchListener(OnTouchListener l) { 3066 mOnTouchListener = l; 3067 } 3068 3069 /** 3070 * Register a callback to be invoked when a drag event is sent to this view. 3071 * @param l The drag listener to attach to this view 3072 */ 3073 public void setOnDragListener(OnDragListener l) { 3074 mOnDragListener = l; 3075 } 3076 3077 /** 3078 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 3079 * 3080 * Note: this does not check whether this {@link View} should get focus, it just 3081 * gives it focus no matter what. It should only be called internally by framework 3082 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3083 * 3084 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 3085 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 3086 * focus moved when requestFocus() is called. It may not always 3087 * apply, in which case use the default View.FOCUS_DOWN. 3088 * @param previouslyFocusedRect The rectangle of the view that had focus 3089 * prior in this View's coordinate system. 3090 */ 3091 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3092 if (DBG) { 3093 System.out.println(this + " requestFocus()"); 3094 } 3095 3096 if ((mPrivateFlags & FOCUSED) == 0) { 3097 mPrivateFlags |= FOCUSED; 3098 3099 if (mParent != null) { 3100 mParent.requestChildFocus(this, this); 3101 } 3102 3103 onFocusChanged(true, direction, previouslyFocusedRect); 3104 refreshDrawableState(); 3105 } 3106 } 3107 3108 /** 3109 * Request that a rectangle of this view be visible on the screen, 3110 * scrolling if necessary just enough. 3111 * 3112 * <p>A View should call this if it maintains some notion of which part 3113 * of its content is interesting. For example, a text editing view 3114 * should call this when its cursor moves. 3115 * 3116 * @param rectangle The rectangle. 3117 * @return Whether any parent scrolled. 3118 */ 3119 public boolean requestRectangleOnScreen(Rect rectangle) { 3120 return requestRectangleOnScreen(rectangle, false); 3121 } 3122 3123 /** 3124 * Request that a rectangle of this view be visible on the screen, 3125 * scrolling if necessary just enough. 3126 * 3127 * <p>A View should call this if it maintains some notion of which part 3128 * of its content is interesting. For example, a text editing view 3129 * should call this when its cursor moves. 3130 * 3131 * <p>When <code>immediate</code> is set to true, scrolling will not be 3132 * animated. 3133 * 3134 * @param rectangle The rectangle. 3135 * @param immediate True to forbid animated scrolling, false otherwise 3136 * @return Whether any parent scrolled. 3137 */ 3138 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3139 View child = this; 3140 ViewParent parent = mParent; 3141 boolean scrolled = false; 3142 while (parent != null) { 3143 scrolled |= parent.requestChildRectangleOnScreen(child, 3144 rectangle, immediate); 3145 3146 // offset rect so next call has the rectangle in the 3147 // coordinate system of its direct child. 3148 rectangle.offset(child.getLeft(), child.getTop()); 3149 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3150 3151 if (!(parent instanceof View)) { 3152 break; 3153 } 3154 3155 child = (View) parent; 3156 parent = child.getParent(); 3157 } 3158 return scrolled; 3159 } 3160 3161 /** 3162 * Called when this view wants to give up focus. This will cause 3163 * {@link #onFocusChanged} to be called. 3164 */ 3165 public void clearFocus() { 3166 if (DBG) { 3167 System.out.println(this + " clearFocus()"); 3168 } 3169 3170 if ((mPrivateFlags & FOCUSED) != 0) { 3171 mPrivateFlags &= ~FOCUSED; 3172 3173 if (mParent != null) { 3174 mParent.clearChildFocus(this); 3175 } 3176 3177 onFocusChanged(false, 0, null); 3178 refreshDrawableState(); 3179 } 3180 } 3181 3182 /** 3183 * Called to clear the focus of a view that is about to be removed. 3184 * Doesn't call clearChildFocus, which prevents this view from taking 3185 * focus again before it has been removed from the parent 3186 */ 3187 void clearFocusForRemoval() { 3188 if ((mPrivateFlags & FOCUSED) != 0) { 3189 mPrivateFlags &= ~FOCUSED; 3190 3191 onFocusChanged(false, 0, null); 3192 refreshDrawableState(); 3193 } 3194 } 3195 3196 /** 3197 * Called internally by the view system when a new view is getting focus. 3198 * This is what clears the old focus. 3199 */ 3200 void unFocus() { 3201 if (DBG) { 3202 System.out.println(this + " unFocus()"); 3203 } 3204 3205 if ((mPrivateFlags & FOCUSED) != 0) { 3206 mPrivateFlags &= ~FOCUSED; 3207 3208 onFocusChanged(false, 0, null); 3209 refreshDrawableState(); 3210 } 3211 } 3212 3213 /** 3214 * Returns true if this view has focus iteself, or is the ancestor of the 3215 * view that has focus. 3216 * 3217 * @return True if this view has or contains focus, false otherwise. 3218 */ 3219 @ViewDebug.ExportedProperty(category = "focus") 3220 public boolean hasFocus() { 3221 return (mPrivateFlags & FOCUSED) != 0; 3222 } 3223 3224 /** 3225 * Returns true if this view is focusable or if it contains a reachable View 3226 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3227 * is a View whose parents do not block descendants focus. 3228 * 3229 * Only {@link #VISIBLE} views are considered focusable. 3230 * 3231 * @return True if the view is focusable or if the view contains a focusable 3232 * View, false otherwise. 3233 * 3234 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3235 */ 3236 public boolean hasFocusable() { 3237 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3238 } 3239 3240 /** 3241 * Called by the view system when the focus state of this view changes. 3242 * When the focus change event is caused by directional navigation, direction 3243 * and previouslyFocusedRect provide insight into where the focus is coming from. 3244 * When overriding, be sure to call up through to the super class so that 3245 * the standard focus handling will occur. 3246 * 3247 * @param gainFocus True if the View has focus; false otherwise. 3248 * @param direction The direction focus has moved when requestFocus() 3249 * is called to give this view focus. Values are 3250 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3251 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3252 * It may not always apply, in which case use the default. 3253 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3254 * system, of the previously focused view. If applicable, this will be 3255 * passed in as finer grained information about where the focus is coming 3256 * from (in addition to direction). Will be <code>null</code> otherwise. 3257 */ 3258 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3259 if (gainFocus) { 3260 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3261 } 3262 3263 InputMethodManager imm = InputMethodManager.peekInstance(); 3264 if (!gainFocus) { 3265 if (isPressed()) { 3266 setPressed(false); 3267 } 3268 if (imm != null && mAttachInfo != null 3269 && mAttachInfo.mHasWindowFocus) { 3270 imm.focusOut(this); 3271 } 3272 onFocusLost(); 3273 } else if (imm != null && mAttachInfo != null 3274 && mAttachInfo.mHasWindowFocus) { 3275 imm.focusIn(this); 3276 } 3277 3278 invalidate(true); 3279 if (mOnFocusChangeListener != null) { 3280 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3281 } 3282 3283 if (mAttachInfo != null) { 3284 mAttachInfo.mKeyDispatchState.reset(this); 3285 } 3286 } 3287 3288 /** 3289 * {@inheritDoc} 3290 */ 3291 public void sendAccessibilityEvent(int eventType) { 3292 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3293 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3294 } 3295 } 3296 3297 /** 3298 * {@inheritDoc} 3299 */ 3300 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3301 if (!isShown()) { 3302 return; 3303 } 3304 event.setClassName(getClass().getName()); 3305 event.setPackageName(getContext().getPackageName()); 3306 event.setEnabled(isEnabled()); 3307 event.setContentDescription(mContentDescription); 3308 3309 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3310 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3311 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3312 event.setItemCount(focusablesTempList.size()); 3313 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3314 focusablesTempList.clear(); 3315 } 3316 3317 dispatchPopulateAccessibilityEvent(event); 3318 3319 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 3320 } 3321 3322 /** 3323 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 3324 * to be populated. 3325 * 3326 * @param event The event. 3327 * 3328 * @return True if the event population was completed. 3329 */ 3330 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3331 return false; 3332 } 3333 3334 /** 3335 * Gets the {@link View} description. It briefly describes the view and is 3336 * primarily used for accessibility support. Set this property to enable 3337 * better accessibility support for your application. This is especially 3338 * true for views that do not have textual representation (For example, 3339 * ImageButton). 3340 * 3341 * @return The content descriptiopn. 3342 * 3343 * @attr ref android.R.styleable#View_contentDescription 3344 */ 3345 public CharSequence getContentDescription() { 3346 return mContentDescription; 3347 } 3348 3349 /** 3350 * Sets the {@link View} description. It briefly describes the view and is 3351 * primarily used for accessibility support. Set this property to enable 3352 * better accessibility support for your application. This is especially 3353 * true for views that do not have textual representation (For example, 3354 * ImageButton). 3355 * 3356 * @param contentDescription The content description. 3357 * 3358 * @attr ref android.R.styleable#View_contentDescription 3359 */ 3360 public void setContentDescription(CharSequence contentDescription) { 3361 mContentDescription = contentDescription; 3362 } 3363 3364 /** 3365 * Invoked whenever this view loses focus, either by losing window focus or by losing 3366 * focus within its window. This method can be used to clear any state tied to the 3367 * focus. For instance, if a button is held pressed with the trackball and the window 3368 * loses focus, this method can be used to cancel the press. 3369 * 3370 * Subclasses of View overriding this method should always call super.onFocusLost(). 3371 * 3372 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3373 * @see #onWindowFocusChanged(boolean) 3374 * 3375 * @hide pending API council approval 3376 */ 3377 protected void onFocusLost() { 3378 resetPressedState(); 3379 } 3380 3381 private void resetPressedState() { 3382 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3383 return; 3384 } 3385 3386 if (isPressed()) { 3387 setPressed(false); 3388 3389 if (!mHasPerformedLongPress) { 3390 removeLongPressCallback(); 3391 } 3392 } 3393 } 3394 3395 /** 3396 * Returns true if this view has focus 3397 * 3398 * @return True if this view has focus, false otherwise. 3399 */ 3400 @ViewDebug.ExportedProperty(category = "focus") 3401 public boolean isFocused() { 3402 return (mPrivateFlags & FOCUSED) != 0; 3403 } 3404 3405 /** 3406 * Find the view in the hierarchy rooted at this view that currently has 3407 * focus. 3408 * 3409 * @return The view that currently has focus, or null if no focused view can 3410 * be found. 3411 */ 3412 public View findFocus() { 3413 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3414 } 3415 3416 /** 3417 * Change whether this view is one of the set of scrollable containers in 3418 * its window. This will be used to determine whether the window can 3419 * resize or must pan when a soft input area is open -- scrollable 3420 * containers allow the window to use resize mode since the container 3421 * will appropriately shrink. 3422 */ 3423 public void setScrollContainer(boolean isScrollContainer) { 3424 if (isScrollContainer) { 3425 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3426 mAttachInfo.mScrollContainers.add(this); 3427 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3428 } 3429 mPrivateFlags |= SCROLL_CONTAINER; 3430 } else { 3431 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3432 mAttachInfo.mScrollContainers.remove(this); 3433 } 3434 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3435 } 3436 } 3437 3438 /** 3439 * Returns the quality of the drawing cache. 3440 * 3441 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3442 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3443 * 3444 * @see #setDrawingCacheQuality(int) 3445 * @see #setDrawingCacheEnabled(boolean) 3446 * @see #isDrawingCacheEnabled() 3447 * 3448 * @attr ref android.R.styleable#View_drawingCacheQuality 3449 */ 3450 public int getDrawingCacheQuality() { 3451 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3452 } 3453 3454 /** 3455 * Set the drawing cache quality of this view. This value is used only when the 3456 * drawing cache is enabled 3457 * 3458 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3459 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3460 * 3461 * @see #getDrawingCacheQuality() 3462 * @see #setDrawingCacheEnabled(boolean) 3463 * @see #isDrawingCacheEnabled() 3464 * 3465 * @attr ref android.R.styleable#View_drawingCacheQuality 3466 */ 3467 public void setDrawingCacheQuality(int quality) { 3468 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3469 } 3470 3471 /** 3472 * Returns whether the screen should remain on, corresponding to the current 3473 * value of {@link #KEEP_SCREEN_ON}. 3474 * 3475 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3476 * 3477 * @see #setKeepScreenOn(boolean) 3478 * 3479 * @attr ref android.R.styleable#View_keepScreenOn 3480 */ 3481 public boolean getKeepScreenOn() { 3482 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3483 } 3484 3485 /** 3486 * Controls whether the screen should remain on, modifying the 3487 * value of {@link #KEEP_SCREEN_ON}. 3488 * 3489 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3490 * 3491 * @see #getKeepScreenOn() 3492 * 3493 * @attr ref android.R.styleable#View_keepScreenOn 3494 */ 3495 public void setKeepScreenOn(boolean keepScreenOn) { 3496 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3497 } 3498 3499 /** 3500 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3501 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3502 * 3503 * @attr ref android.R.styleable#View_nextFocusLeft 3504 */ 3505 public int getNextFocusLeftId() { 3506 return mNextFocusLeftId; 3507 } 3508 3509 /** 3510 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3511 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3512 * decide automatically. 3513 * 3514 * @attr ref android.R.styleable#View_nextFocusLeft 3515 */ 3516 public void setNextFocusLeftId(int nextFocusLeftId) { 3517 mNextFocusLeftId = nextFocusLeftId; 3518 } 3519 3520 /** 3521 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3522 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3523 * 3524 * @attr ref android.R.styleable#View_nextFocusRight 3525 */ 3526 public int getNextFocusRightId() { 3527 return mNextFocusRightId; 3528 } 3529 3530 /** 3531 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3532 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3533 * decide automatically. 3534 * 3535 * @attr ref android.R.styleable#View_nextFocusRight 3536 */ 3537 public void setNextFocusRightId(int nextFocusRightId) { 3538 mNextFocusRightId = nextFocusRightId; 3539 } 3540 3541 /** 3542 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3543 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3544 * 3545 * @attr ref android.R.styleable#View_nextFocusUp 3546 */ 3547 public int getNextFocusUpId() { 3548 return mNextFocusUpId; 3549 } 3550 3551 /** 3552 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3553 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 3554 * decide automatically. 3555 * 3556 * @attr ref android.R.styleable#View_nextFocusUp 3557 */ 3558 public void setNextFocusUpId(int nextFocusUpId) { 3559 mNextFocusUpId = nextFocusUpId; 3560 } 3561 3562 /** 3563 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3564 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3565 * 3566 * @attr ref android.R.styleable#View_nextFocusDown 3567 */ 3568 public int getNextFocusDownId() { 3569 return mNextFocusDownId; 3570 } 3571 3572 /** 3573 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3574 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 3575 * decide automatically. 3576 * 3577 * @attr ref android.R.styleable#View_nextFocusDown 3578 */ 3579 public void setNextFocusDownId(int nextFocusDownId) { 3580 mNextFocusDownId = nextFocusDownId; 3581 } 3582 3583 /** 3584 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3585 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3586 * 3587 * @attr ref android.R.styleable#View_nextFocusForward 3588 */ 3589 public int getNextFocusForwardId() { 3590 return mNextFocusForwardId; 3591 } 3592 3593 /** 3594 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3595 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 3596 * decide automatically. 3597 * 3598 * @attr ref android.R.styleable#View_nextFocusForward 3599 */ 3600 public void setNextFocusForwardId(int nextFocusForwardId) { 3601 mNextFocusForwardId = nextFocusForwardId; 3602 } 3603 3604 /** 3605 * Returns the visibility of this view and all of its ancestors 3606 * 3607 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3608 */ 3609 public boolean isShown() { 3610 View current = this; 3611 //noinspection ConstantConditions 3612 do { 3613 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3614 return false; 3615 } 3616 ViewParent parent = current.mParent; 3617 if (parent == null) { 3618 return false; // We are not attached to the view root 3619 } 3620 if (!(parent instanceof View)) { 3621 return true; 3622 } 3623 current = (View) parent; 3624 } while (current != null); 3625 3626 return false; 3627 } 3628 3629 /** 3630 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3631 * is set 3632 * 3633 * @param insets Insets for system windows 3634 * 3635 * @return True if this view applied the insets, false otherwise 3636 */ 3637 protected boolean fitSystemWindows(Rect insets) { 3638 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3639 mPaddingLeft = insets.left; 3640 mPaddingTop = insets.top; 3641 mPaddingRight = insets.right; 3642 mPaddingBottom = insets.bottom; 3643 requestLayout(); 3644 return true; 3645 } 3646 return false; 3647 } 3648 3649 /** 3650 * Determine if this view has the FITS_SYSTEM_WINDOWS flag set. 3651 * @return True if window has FITS_SYSTEM_WINDOWS set 3652 * 3653 * @hide 3654 */ 3655 public boolean isFitsSystemWindowsFlagSet() { 3656 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 3657 } 3658 3659 /** 3660 * Returns the visibility status for this view. 3661 * 3662 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3663 * @attr ref android.R.styleable#View_visibility 3664 */ 3665 @ViewDebug.ExportedProperty(mapping = { 3666 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3667 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3668 @ViewDebug.IntToString(from = GONE, to = "GONE") 3669 }) 3670 public int getVisibility() { 3671 return mViewFlags & VISIBILITY_MASK; 3672 } 3673 3674 /** 3675 * Set the enabled state of this view. 3676 * 3677 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3678 * @attr ref android.R.styleable#View_visibility 3679 */ 3680 @RemotableViewMethod 3681 public void setVisibility(int visibility) { 3682 setFlags(visibility, VISIBILITY_MASK); 3683 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3684 } 3685 3686 /** 3687 * Returns the enabled status for this view. The interpretation of the 3688 * enabled state varies by subclass. 3689 * 3690 * @return True if this view is enabled, false otherwise. 3691 */ 3692 @ViewDebug.ExportedProperty 3693 public boolean isEnabled() { 3694 return (mViewFlags & ENABLED_MASK) == ENABLED; 3695 } 3696 3697 /** 3698 * Set the enabled state of this view. The interpretation of the enabled 3699 * state varies by subclass. 3700 * 3701 * @param enabled True if this view is enabled, false otherwise. 3702 */ 3703 @RemotableViewMethod 3704 public void setEnabled(boolean enabled) { 3705 if (enabled == isEnabled()) return; 3706 3707 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3708 3709 /* 3710 * The View most likely has to change its appearance, so refresh 3711 * the drawable state. 3712 */ 3713 refreshDrawableState(); 3714 3715 // Invalidate too, since the default behavior for views is to be 3716 // be drawn at 50% alpha rather than to change the drawable. 3717 invalidate(true); 3718 } 3719 3720 /** 3721 * Set whether this view can receive the focus. 3722 * 3723 * Setting this to false will also ensure that this view is not focusable 3724 * in touch mode. 3725 * 3726 * @param focusable If true, this view can receive the focus. 3727 * 3728 * @see #setFocusableInTouchMode(boolean) 3729 * @attr ref android.R.styleable#View_focusable 3730 */ 3731 public void setFocusable(boolean focusable) { 3732 if (!focusable) { 3733 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3734 } 3735 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3736 } 3737 3738 /** 3739 * Set whether this view can receive focus while in touch mode. 3740 * 3741 * Setting this to true will also ensure that this view is focusable. 3742 * 3743 * @param focusableInTouchMode If true, this view can receive the focus while 3744 * in touch mode. 3745 * 3746 * @see #setFocusable(boolean) 3747 * @attr ref android.R.styleable#View_focusableInTouchMode 3748 */ 3749 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3750 // Focusable in touch mode should always be set before the focusable flag 3751 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3752 // which, in touch mode, will not successfully request focus on this view 3753 // because the focusable in touch mode flag is not set 3754 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3755 if (focusableInTouchMode) { 3756 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3757 } 3758 } 3759 3760 /** 3761 * Set whether this view should have sound effects enabled for events such as 3762 * clicking and touching. 3763 * 3764 * <p>You may wish to disable sound effects for a view if you already play sounds, 3765 * for instance, a dial key that plays dtmf tones. 3766 * 3767 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3768 * @see #isSoundEffectsEnabled() 3769 * @see #playSoundEffect(int) 3770 * @attr ref android.R.styleable#View_soundEffectsEnabled 3771 */ 3772 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3773 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3774 } 3775 3776 /** 3777 * @return whether this view should have sound effects enabled for events such as 3778 * clicking and touching. 3779 * 3780 * @see #setSoundEffectsEnabled(boolean) 3781 * @see #playSoundEffect(int) 3782 * @attr ref android.R.styleable#View_soundEffectsEnabled 3783 */ 3784 @ViewDebug.ExportedProperty 3785 public boolean isSoundEffectsEnabled() { 3786 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3787 } 3788 3789 /** 3790 * Set whether this view should have haptic feedback for events such as 3791 * long presses. 3792 * 3793 * <p>You may wish to disable haptic feedback if your view already controls 3794 * its own haptic feedback. 3795 * 3796 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3797 * @see #isHapticFeedbackEnabled() 3798 * @see #performHapticFeedback(int) 3799 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3800 */ 3801 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3802 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3803 } 3804 3805 /** 3806 * @return whether this view should have haptic feedback enabled for events 3807 * long presses. 3808 * 3809 * @see #setHapticFeedbackEnabled(boolean) 3810 * @see #performHapticFeedback(int) 3811 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3812 */ 3813 @ViewDebug.ExportedProperty 3814 public boolean isHapticFeedbackEnabled() { 3815 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3816 } 3817 3818 /** 3819 * If this view doesn't do any drawing on its own, set this flag to 3820 * allow further optimizations. By default, this flag is not set on 3821 * View, but could be set on some View subclasses such as ViewGroup. 3822 * 3823 * Typically, if you override {@link #onDraw} you should clear this flag. 3824 * 3825 * @param willNotDraw whether or not this View draw on its own 3826 */ 3827 public void setWillNotDraw(boolean willNotDraw) { 3828 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3829 } 3830 3831 /** 3832 * Returns whether or not this View draws on its own. 3833 * 3834 * @return true if this view has nothing to draw, false otherwise 3835 */ 3836 @ViewDebug.ExportedProperty(category = "drawing") 3837 public boolean willNotDraw() { 3838 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3839 } 3840 3841 /** 3842 * When a View's drawing cache is enabled, drawing is redirected to an 3843 * offscreen bitmap. Some views, like an ImageView, must be able to 3844 * bypass this mechanism if they already draw a single bitmap, to avoid 3845 * unnecessary usage of the memory. 3846 * 3847 * @param willNotCacheDrawing true if this view does not cache its 3848 * drawing, false otherwise 3849 */ 3850 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3851 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3852 } 3853 3854 /** 3855 * Returns whether or not this View can cache its drawing or not. 3856 * 3857 * @return true if this view does not cache its drawing, false otherwise 3858 */ 3859 @ViewDebug.ExportedProperty(category = "drawing") 3860 public boolean willNotCacheDrawing() { 3861 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3862 } 3863 3864 /** 3865 * Indicates whether this view reacts to click events or not. 3866 * 3867 * @return true if the view is clickable, false otherwise 3868 * 3869 * @see #setClickable(boolean) 3870 * @attr ref android.R.styleable#View_clickable 3871 */ 3872 @ViewDebug.ExportedProperty 3873 public boolean isClickable() { 3874 return (mViewFlags & CLICKABLE) == CLICKABLE; 3875 } 3876 3877 /** 3878 * Enables or disables click events for this view. When a view 3879 * is clickable it will change its state to "pressed" on every click. 3880 * Subclasses should set the view clickable to visually react to 3881 * user's clicks. 3882 * 3883 * @param clickable true to make the view clickable, false otherwise 3884 * 3885 * @see #isClickable() 3886 * @attr ref android.R.styleable#View_clickable 3887 */ 3888 public void setClickable(boolean clickable) { 3889 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3890 } 3891 3892 /** 3893 * Indicates whether this view reacts to long click events or not. 3894 * 3895 * @return true if the view is long clickable, false otherwise 3896 * 3897 * @see #setLongClickable(boolean) 3898 * @attr ref android.R.styleable#View_longClickable 3899 */ 3900 public boolean isLongClickable() { 3901 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 3902 } 3903 3904 /** 3905 * Enables or disables long click events for this view. When a view is long 3906 * clickable it reacts to the user holding down the button for a longer 3907 * duration than a tap. This event can either launch the listener or a 3908 * context menu. 3909 * 3910 * @param longClickable true to make the view long clickable, false otherwise 3911 * @see #isLongClickable() 3912 * @attr ref android.R.styleable#View_longClickable 3913 */ 3914 public void setLongClickable(boolean longClickable) { 3915 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 3916 } 3917 3918 /** 3919 * Sets the pressed state for this view. 3920 * 3921 * @see #isClickable() 3922 * @see #setClickable(boolean) 3923 * 3924 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 3925 * the View's internal state from a previously set "pressed" state. 3926 */ 3927 public void setPressed(boolean pressed) { 3928 if (pressed) { 3929 mPrivateFlags |= PRESSED; 3930 } else { 3931 mPrivateFlags &= ~PRESSED; 3932 } 3933 refreshDrawableState(); 3934 dispatchSetPressed(pressed); 3935 } 3936 3937 /** 3938 * Dispatch setPressed to all of this View's children. 3939 * 3940 * @see #setPressed(boolean) 3941 * 3942 * @param pressed The new pressed state 3943 */ 3944 protected void dispatchSetPressed(boolean pressed) { 3945 } 3946 3947 /** 3948 * Indicates whether the view is currently in pressed state. Unless 3949 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 3950 * the pressed state. 3951 * 3952 * @see #setPressed 3953 * @see #isClickable() 3954 * @see #setClickable(boolean) 3955 * 3956 * @return true if the view is currently pressed, false otherwise 3957 */ 3958 public boolean isPressed() { 3959 return (mPrivateFlags & PRESSED) == PRESSED; 3960 } 3961 3962 /** 3963 * Indicates whether this view will save its state (that is, 3964 * whether its {@link #onSaveInstanceState} method will be called). 3965 * 3966 * @return Returns true if the view state saving is enabled, else false. 3967 * 3968 * @see #setSaveEnabled(boolean) 3969 * @attr ref android.R.styleable#View_saveEnabled 3970 */ 3971 public boolean isSaveEnabled() { 3972 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 3973 } 3974 3975 /** 3976 * Controls whether the saving of this view's state is 3977 * enabled (that is, whether its {@link #onSaveInstanceState} method 3978 * will be called). Note that even if freezing is enabled, the 3979 * view still must have an id assigned to it (via {@link #setId setId()}) 3980 * for its state to be saved. This flag can only disable the 3981 * saving of this view; any child views may still have their state saved. 3982 * 3983 * @param enabled Set to false to <em>disable</em> state saving, or true 3984 * (the default) to allow it. 3985 * 3986 * @see #isSaveEnabled() 3987 * @see #setId(int) 3988 * @see #onSaveInstanceState() 3989 * @attr ref android.R.styleable#View_saveEnabled 3990 */ 3991 public void setSaveEnabled(boolean enabled) { 3992 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 3993 } 3994 3995 /** 3996 * Gets whether the framework should discard touches when the view's 3997 * window is obscured by another visible window. 3998 * Refer to the {@link View} security documentation for more details. 3999 * 4000 * @return True if touch filtering is enabled. 4001 * 4002 * @see #setFilterTouchesWhenObscured(boolean) 4003 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4004 */ 4005 @ViewDebug.ExportedProperty 4006 public boolean getFilterTouchesWhenObscured() { 4007 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4008 } 4009 4010 /** 4011 * Sets whether the framework should discard touches when the view's 4012 * window is obscured by another visible window. 4013 * Refer to the {@link View} security documentation for more details. 4014 * 4015 * @param enabled True if touch filtering should be enabled. 4016 * 4017 * @see #getFilterTouchesWhenObscured 4018 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4019 */ 4020 public void setFilterTouchesWhenObscured(boolean enabled) { 4021 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4022 FILTER_TOUCHES_WHEN_OBSCURED); 4023 } 4024 4025 /** 4026 * Indicates whether the entire hierarchy under this view will save its 4027 * state when a state saving traversal occurs from its parent. The default 4028 * is true; if false, these views will not be saved unless 4029 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4030 * 4031 * @return Returns true if the view state saving from parent is enabled, else false. 4032 * 4033 * @see #setSaveFromParentEnabled(boolean) 4034 */ 4035 public boolean isSaveFromParentEnabled() { 4036 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4037 } 4038 4039 /** 4040 * Controls whether the entire hierarchy under this view will save its 4041 * state when a state saving traversal occurs from its parent. The default 4042 * is true; if false, these views will not be saved unless 4043 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4044 * 4045 * @param enabled Set to false to <em>disable</em> state saving, or true 4046 * (the default) to allow it. 4047 * 4048 * @see #isSaveFromParentEnabled() 4049 * @see #setId(int) 4050 * @see #onSaveInstanceState() 4051 */ 4052 public void setSaveFromParentEnabled(boolean enabled) { 4053 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4054 } 4055 4056 4057 /** 4058 * Returns whether this View is able to take focus. 4059 * 4060 * @return True if this view can take focus, or false otherwise. 4061 * @attr ref android.R.styleable#View_focusable 4062 */ 4063 @ViewDebug.ExportedProperty(category = "focus") 4064 public final boolean isFocusable() { 4065 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4066 } 4067 4068 /** 4069 * When a view is focusable, it may not want to take focus when in touch mode. 4070 * For example, a button would like focus when the user is navigating via a D-pad 4071 * so that the user can click on it, but once the user starts touching the screen, 4072 * the button shouldn't take focus 4073 * @return Whether the view is focusable in touch mode. 4074 * @attr ref android.R.styleable#View_focusableInTouchMode 4075 */ 4076 @ViewDebug.ExportedProperty 4077 public final boolean isFocusableInTouchMode() { 4078 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4079 } 4080 4081 /** 4082 * Find the nearest view in the specified direction that can take focus. 4083 * This does not actually give focus to that view. 4084 * 4085 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4086 * 4087 * @return The nearest focusable in the specified direction, or null if none 4088 * can be found. 4089 */ 4090 public View focusSearch(int direction) { 4091 if (mParent != null) { 4092 return mParent.focusSearch(this, direction); 4093 } else { 4094 return null; 4095 } 4096 } 4097 4098 /** 4099 * This method is the last chance for the focused view and its ancestors to 4100 * respond to an arrow key. This is called when the focused view did not 4101 * consume the key internally, nor could the view system find a new view in 4102 * the requested direction to give focus to. 4103 * 4104 * @param focused The currently focused view. 4105 * @param direction The direction focus wants to move. One of FOCUS_UP, 4106 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4107 * @return True if the this view consumed this unhandled move. 4108 */ 4109 public boolean dispatchUnhandledMove(View focused, int direction) { 4110 return false; 4111 } 4112 4113 /** 4114 * If a user manually specified the next view id for a particular direction, 4115 * use the root to look up the view. 4116 * @param root The root view of the hierarchy containing this view. 4117 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4118 * or FOCUS_BACKWARD. 4119 * @return The user specified next view, or null if there is none. 4120 */ 4121 View findUserSetNextFocus(View root, int direction) { 4122 switch (direction) { 4123 case FOCUS_LEFT: 4124 if (mNextFocusLeftId == View.NO_ID) return null; 4125 return findViewShouldExist(root, mNextFocusLeftId); 4126 case FOCUS_RIGHT: 4127 if (mNextFocusRightId == View.NO_ID) return null; 4128 return findViewShouldExist(root, mNextFocusRightId); 4129 case FOCUS_UP: 4130 if (mNextFocusUpId == View.NO_ID) return null; 4131 return findViewShouldExist(root, mNextFocusUpId); 4132 case FOCUS_DOWN: 4133 if (mNextFocusDownId == View.NO_ID) return null; 4134 return findViewShouldExist(root, mNextFocusDownId); 4135 case FOCUS_FORWARD: 4136 if (mNextFocusForwardId == View.NO_ID) return null; 4137 return findViewShouldExist(root, mNextFocusForwardId); 4138 case FOCUS_BACKWARD: { 4139 final int id = mID; 4140 return root.findViewByPredicate(new Predicate<View>() { 4141 @Override 4142 public boolean apply(View t) { 4143 return t.mNextFocusForwardId == id; 4144 } 4145 }); 4146 } 4147 } 4148 return null; 4149 } 4150 4151 private static View findViewShouldExist(View root, int childViewId) { 4152 View result = root.findViewById(childViewId); 4153 if (result == null) { 4154 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4155 + "by user for id " + childViewId); 4156 } 4157 return result; 4158 } 4159 4160 /** 4161 * Find and return all focusable views that are descendants of this view, 4162 * possibly including this view if it is focusable itself. 4163 * 4164 * @param direction The direction of the focus 4165 * @return A list of focusable views 4166 */ 4167 public ArrayList<View> getFocusables(int direction) { 4168 ArrayList<View> result = new ArrayList<View>(24); 4169 addFocusables(result, direction); 4170 return result; 4171 } 4172 4173 /** 4174 * Add any focusable views that are descendants of this view (possibly 4175 * including this view if it is focusable itself) to views. If we are in touch mode, 4176 * only add views that are also focusable in touch mode. 4177 * 4178 * @param views Focusable views found so far 4179 * @param direction The direction of the focus 4180 */ 4181 public void addFocusables(ArrayList<View> views, int direction) { 4182 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4183 } 4184 4185 /** 4186 * Adds any focusable views that are descendants of this view (possibly 4187 * including this view if it is focusable itself) to views. This method 4188 * adds all focusable views regardless if we are in touch mode or 4189 * only views focusable in touch mode if we are in touch mode depending on 4190 * the focusable mode paramater. 4191 * 4192 * @param views Focusable views found so far or null if all we are interested is 4193 * the number of focusables. 4194 * @param direction The direction of the focus. 4195 * @param focusableMode The type of focusables to be added. 4196 * 4197 * @see #FOCUSABLES_ALL 4198 * @see #FOCUSABLES_TOUCH_MODE 4199 */ 4200 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4201 if (!isFocusable()) { 4202 return; 4203 } 4204 4205 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4206 isInTouchMode() && !isFocusableInTouchMode()) { 4207 return; 4208 } 4209 4210 if (views != null) { 4211 views.add(this); 4212 } 4213 } 4214 4215 /** 4216 * Find and return all touchable views that are descendants of this view, 4217 * possibly including this view if it is touchable itself. 4218 * 4219 * @return A list of touchable views 4220 */ 4221 public ArrayList<View> getTouchables() { 4222 ArrayList<View> result = new ArrayList<View>(); 4223 addTouchables(result); 4224 return result; 4225 } 4226 4227 /** 4228 * Add any touchable views that are descendants of this view (possibly 4229 * including this view if it is touchable itself) to views. 4230 * 4231 * @param views Touchable views found so far 4232 */ 4233 public void addTouchables(ArrayList<View> views) { 4234 final int viewFlags = mViewFlags; 4235 4236 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4237 && (viewFlags & ENABLED_MASK) == ENABLED) { 4238 views.add(this); 4239 } 4240 } 4241 4242 /** 4243 * Call this to try to give focus to a specific view or to one of its 4244 * descendants. 4245 * 4246 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4247 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4248 * while the device is in touch mode. 4249 * 4250 * See also {@link #focusSearch}, which is what you call to say that you 4251 * have focus, and you want your parent to look for the next one. 4252 * 4253 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4254 * {@link #FOCUS_DOWN} and <code>null</code>. 4255 * 4256 * @return Whether this view or one of its descendants actually took focus. 4257 */ 4258 public final boolean requestFocus() { 4259 return requestFocus(View.FOCUS_DOWN); 4260 } 4261 4262 4263 /** 4264 * Call this to try to give focus to a specific view or to one of its 4265 * descendants and give it a hint about what direction focus is heading. 4266 * 4267 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4268 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4269 * while the device is in touch mode. 4270 * 4271 * See also {@link #focusSearch}, which is what you call to say that you 4272 * have focus, and you want your parent to look for the next one. 4273 * 4274 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4275 * <code>null</code> set for the previously focused rectangle. 4276 * 4277 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4278 * @return Whether this view or one of its descendants actually took focus. 4279 */ 4280 public final boolean requestFocus(int direction) { 4281 return requestFocus(direction, null); 4282 } 4283 4284 /** 4285 * Call this to try to give focus to a specific view or to one of its descendants 4286 * and give it hints about the direction and a specific rectangle that the focus 4287 * is coming from. The rectangle can help give larger views a finer grained hint 4288 * about where focus is coming from, and therefore, where to show selection, or 4289 * forward focus change internally. 4290 * 4291 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4292 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4293 * while the device is in touch mode. 4294 * 4295 * A View will not take focus if it is not visible. 4296 * 4297 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 4298 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4299 * 4300 * See also {@link #focusSearch}, which is what you call to say that you 4301 * have focus, and you want your parent to look for the next one. 4302 * 4303 * You may wish to override this method if your custom {@link View} has an internal 4304 * {@link View} that it wishes to forward the request to. 4305 * 4306 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4307 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4308 * to give a finer grained hint about where focus is coming from. May be null 4309 * if there is no hint. 4310 * @return Whether this view or one of its descendants actually took focus. 4311 */ 4312 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4313 // need to be focusable 4314 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4315 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4316 return false; 4317 } 4318 4319 // need to be focusable in touch mode if in touch mode 4320 if (isInTouchMode() && 4321 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4322 return false; 4323 } 4324 4325 // need to not have any parents blocking us 4326 if (hasAncestorThatBlocksDescendantFocus()) { 4327 return false; 4328 } 4329 4330 handleFocusGainInternal(direction, previouslyFocusedRect); 4331 return true; 4332 } 4333 4334 /** Gets the ViewRoot, or null if not attached. */ 4335 /*package*/ ViewRoot getViewRoot() { 4336 View root = getRootView(); 4337 return root != null ? (ViewRoot)root.getParent() : null; 4338 } 4339 4340 /** 4341 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4342 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4343 * touch mode to request focus when they are touched. 4344 * 4345 * @return Whether this view or one of its descendants actually took focus. 4346 * 4347 * @see #isInTouchMode() 4348 * 4349 */ 4350 public final boolean requestFocusFromTouch() { 4351 // Leave touch mode if we need to 4352 if (isInTouchMode()) { 4353 ViewRoot viewRoot = getViewRoot(); 4354 if (viewRoot != null) { 4355 viewRoot.ensureTouchMode(false); 4356 } 4357 } 4358 return requestFocus(View.FOCUS_DOWN); 4359 } 4360 4361 /** 4362 * @return Whether any ancestor of this view blocks descendant focus. 4363 */ 4364 private boolean hasAncestorThatBlocksDescendantFocus() { 4365 ViewParent ancestor = mParent; 4366 while (ancestor instanceof ViewGroup) { 4367 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4368 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4369 return true; 4370 } else { 4371 ancestor = vgAncestor.getParent(); 4372 } 4373 } 4374 return false; 4375 } 4376 4377 /** 4378 * @hide 4379 */ 4380 public void dispatchStartTemporaryDetach() { 4381 onStartTemporaryDetach(); 4382 } 4383 4384 /** 4385 * This is called when a container is going to temporarily detach a child, with 4386 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4387 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4388 * {@link #onDetachedFromWindow()} when the container is done. 4389 */ 4390 public void onStartTemporaryDetach() { 4391 removeUnsetPressCallback(); 4392 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4393 } 4394 4395 /** 4396 * @hide 4397 */ 4398 public void dispatchFinishTemporaryDetach() { 4399 onFinishTemporaryDetach(); 4400 } 4401 4402 /** 4403 * Called after {@link #onStartTemporaryDetach} when the container is done 4404 * changing the view. 4405 */ 4406 public void onFinishTemporaryDetach() { 4407 } 4408 4409 /** 4410 * capture information of this view for later analysis: developement only 4411 * check dynamic switch to make sure we only dump view 4412 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4413 */ 4414 private static void captureViewInfo(String subTag, View v) { 4415 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4416 return; 4417 } 4418 ViewDebug.dumpCapturedView(subTag, v); 4419 } 4420 4421 /** 4422 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4423 * for this view's window. Returns null if the view is not currently attached 4424 * to the window. Normally you will not need to use this directly, but 4425 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4426 */ 4427 public KeyEvent.DispatcherState getKeyDispatcherState() { 4428 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4429 } 4430 4431 /** 4432 * Dispatch a key event before it is processed by any input method 4433 * associated with the view hierarchy. This can be used to intercept 4434 * key events in special situations before the IME consumes them; a 4435 * typical example would be handling the BACK key to update the application's 4436 * UI instead of allowing the IME to see it and close itself. 4437 * 4438 * @param event The key event to be dispatched. 4439 * @return True if the event was handled, false otherwise. 4440 */ 4441 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4442 return onKeyPreIme(event.getKeyCode(), event); 4443 } 4444 4445 /** 4446 * Dispatch a key event to the next view on the focus path. This path runs 4447 * from the top of the view tree down to the currently focused view. If this 4448 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4449 * the next node down the focus path. This method also fires any key 4450 * listeners. 4451 * 4452 * @param event The key event to be dispatched. 4453 * @return True if the event was handled, false otherwise. 4454 */ 4455 public boolean dispatchKeyEvent(KeyEvent event) { 4456 // If any attached key listener a first crack at the event. 4457 4458 //noinspection SimplifiableIfStatement,deprecation 4459 if (android.util.Config.LOGV) { 4460 captureViewInfo("captureViewKeyEvent", this); 4461 } 4462 4463 //noinspection SimplifiableIfStatement 4464 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4465 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4466 return true; 4467 } 4468 4469 return event.dispatch(this, mAttachInfo != null 4470 ? mAttachInfo.mKeyDispatchState : null, this); 4471 } 4472 4473 /** 4474 * Dispatches a key shortcut event. 4475 * 4476 * @param event The key event to be dispatched. 4477 * @return True if the event was handled by the view, false otherwise. 4478 */ 4479 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4480 return onKeyShortcut(event.getKeyCode(), event); 4481 } 4482 4483 /** 4484 * Pass the touch screen motion event down to the target view, or this 4485 * view if it is the target. 4486 * 4487 * @param event The motion event to be dispatched. 4488 * @return True if the event was handled by the view, false otherwise. 4489 */ 4490 public boolean dispatchTouchEvent(MotionEvent event) { 4491 if (!onFilterTouchEventForSecurity(event)) { 4492 return false; 4493 } 4494 4495 //noinspection SimplifiableIfStatement 4496 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4497 mOnTouchListener.onTouch(this, event)) { 4498 return true; 4499 } 4500 return onTouchEvent(event); 4501 } 4502 4503 /** 4504 * Filter the touch event to apply security policies. 4505 * 4506 * @param event The motion event to be filtered. 4507 * @return True if the event should be dispatched, false if the event should be dropped. 4508 * 4509 * @see #getFilterTouchesWhenObscured 4510 */ 4511 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4512 //noinspection RedundantIfStatement 4513 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4514 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4515 // Window is obscured, drop this touch. 4516 return false; 4517 } 4518 return true; 4519 } 4520 4521 /** 4522 * Pass a trackball motion event down to the focused view. 4523 * 4524 * @param event The motion event to be dispatched. 4525 * @return True if the event was handled by the view, false otherwise. 4526 */ 4527 public boolean dispatchTrackballEvent(MotionEvent event) { 4528 //Log.i("view", "view=" + this + ", " + event.toString()); 4529 return onTrackballEvent(event); 4530 } 4531 4532 /** 4533 * Pass a generic motion event down to the focused view. 4534 * 4535 * @param event The motion event to be dispatched. 4536 * @return True if the event was handled by the view, false otherwise. 4537 */ 4538 public boolean dispatchGenericMotionEvent(MotionEvent event) { 4539 return onGenericMotionEvent(event); 4540 } 4541 4542 /** 4543 * Called when the window containing this view gains or loses window focus. 4544 * ViewGroups should override to route to their children. 4545 * 4546 * @param hasFocus True if the window containing this view now has focus, 4547 * false otherwise. 4548 */ 4549 public void dispatchWindowFocusChanged(boolean hasFocus) { 4550 onWindowFocusChanged(hasFocus); 4551 } 4552 4553 /** 4554 * Called when the window containing this view gains or loses focus. Note 4555 * that this is separate from view focus: to receive key events, both 4556 * your view and its window must have focus. If a window is displayed 4557 * on top of yours that takes input focus, then your own window will lose 4558 * focus but the view focus will remain unchanged. 4559 * 4560 * @param hasWindowFocus True if the window containing this view now has 4561 * focus, false otherwise. 4562 */ 4563 public void onWindowFocusChanged(boolean hasWindowFocus) { 4564 InputMethodManager imm = InputMethodManager.peekInstance(); 4565 if (!hasWindowFocus) { 4566 if (isPressed()) { 4567 setPressed(false); 4568 } 4569 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4570 imm.focusOut(this); 4571 } 4572 removeLongPressCallback(); 4573 removeTapCallback(); 4574 onFocusLost(); 4575 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4576 imm.focusIn(this); 4577 } 4578 refreshDrawableState(); 4579 } 4580 4581 /** 4582 * Returns true if this view is in a window that currently has window focus. 4583 * Note that this is not the same as the view itself having focus. 4584 * 4585 * @return True if this view is in a window that currently has window focus. 4586 */ 4587 public boolean hasWindowFocus() { 4588 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4589 } 4590 4591 /** 4592 * Dispatch a view visibility change down the view hierarchy. 4593 * ViewGroups should override to route to their children. 4594 * @param changedView The view whose visibility changed. Could be 'this' or 4595 * an ancestor view. 4596 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4597 * {@link #INVISIBLE} or {@link #GONE}. 4598 */ 4599 protected void dispatchVisibilityChanged(View changedView, int visibility) { 4600 onVisibilityChanged(changedView, visibility); 4601 } 4602 4603 /** 4604 * Called when the visibility of the view or an ancestor of the view is changed. 4605 * @param changedView The view whose visibility changed. Could be 'this' or 4606 * an ancestor view. 4607 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4608 * {@link #INVISIBLE} or {@link #GONE}. 4609 */ 4610 protected void onVisibilityChanged(View changedView, int visibility) { 4611 if (visibility == VISIBLE) { 4612 if (mAttachInfo != null) { 4613 initialAwakenScrollBars(); 4614 } else { 4615 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4616 } 4617 } 4618 } 4619 4620 /** 4621 * Dispatch a hint about whether this view is displayed. For instance, when 4622 * a View moves out of the screen, it might receives a display hint indicating 4623 * the view is not displayed. Applications should not <em>rely</em> on this hint 4624 * as there is no guarantee that they will receive one. 4625 * 4626 * @param hint A hint about whether or not this view is displayed: 4627 * {@link #VISIBLE} or {@link #INVISIBLE}. 4628 */ 4629 public void dispatchDisplayHint(int hint) { 4630 onDisplayHint(hint); 4631 } 4632 4633 /** 4634 * Gives this view a hint about whether is displayed or not. For instance, when 4635 * a View moves out of the screen, it might receives a display hint indicating 4636 * the view is not displayed. Applications should not <em>rely</em> on this hint 4637 * as there is no guarantee that they will receive one. 4638 * 4639 * @param hint A hint about whether or not this view is displayed: 4640 * {@link #VISIBLE} or {@link #INVISIBLE}. 4641 */ 4642 protected void onDisplayHint(int hint) { 4643 } 4644 4645 /** 4646 * Dispatch a window visibility change down the view hierarchy. 4647 * ViewGroups should override to route to their children. 4648 * 4649 * @param visibility The new visibility of the window. 4650 * 4651 * @see #onWindowVisibilityChanged 4652 */ 4653 public void dispatchWindowVisibilityChanged(int visibility) { 4654 onWindowVisibilityChanged(visibility); 4655 } 4656 4657 /** 4658 * Called when the window containing has change its visibility 4659 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4660 * that this tells you whether or not your window is being made visible 4661 * to the window manager; this does <em>not</em> tell you whether or not 4662 * your window is obscured by other windows on the screen, even if it 4663 * is itself visible. 4664 * 4665 * @param visibility The new visibility of the window. 4666 */ 4667 protected void onWindowVisibilityChanged(int visibility) { 4668 if (visibility == VISIBLE) { 4669 initialAwakenScrollBars(); 4670 } 4671 } 4672 4673 /** 4674 * Returns the current visibility of the window this view is attached to 4675 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4676 * 4677 * @return Returns the current visibility of the view's window. 4678 */ 4679 public int getWindowVisibility() { 4680 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4681 } 4682 4683 /** 4684 * Retrieve the overall visible display size in which the window this view is 4685 * attached to has been positioned in. This takes into account screen 4686 * decorations above the window, for both cases where the window itself 4687 * is being position inside of them or the window is being placed under 4688 * then and covered insets are used for the window to position its content 4689 * inside. In effect, this tells you the available area where content can 4690 * be placed and remain visible to users. 4691 * 4692 * <p>This function requires an IPC back to the window manager to retrieve 4693 * the requested information, so should not be used in performance critical 4694 * code like drawing. 4695 * 4696 * @param outRect Filled in with the visible display frame. If the view 4697 * is not attached to a window, this is simply the raw display size. 4698 */ 4699 public void getWindowVisibleDisplayFrame(Rect outRect) { 4700 if (mAttachInfo != null) { 4701 try { 4702 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4703 } catch (RemoteException e) { 4704 return; 4705 } 4706 // XXX This is really broken, and probably all needs to be done 4707 // in the window manager, and we need to know more about whether 4708 // we want the area behind or in front of the IME. 4709 final Rect insets = mAttachInfo.mVisibleInsets; 4710 outRect.left += insets.left; 4711 outRect.top += insets.top; 4712 outRect.right -= insets.right; 4713 outRect.bottom -= insets.bottom; 4714 return; 4715 } 4716 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4717 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4718 } 4719 4720 /** 4721 * Dispatch a notification about a resource configuration change down 4722 * the view hierarchy. 4723 * ViewGroups should override to route to their children. 4724 * 4725 * @param newConfig The new resource configuration. 4726 * 4727 * @see #onConfigurationChanged 4728 */ 4729 public void dispatchConfigurationChanged(Configuration newConfig) { 4730 onConfigurationChanged(newConfig); 4731 } 4732 4733 /** 4734 * Called when the current configuration of the resources being used 4735 * by the application have changed. You can use this to decide when 4736 * to reload resources that can changed based on orientation and other 4737 * configuration characterstics. You only need to use this if you are 4738 * not relying on the normal {@link android.app.Activity} mechanism of 4739 * recreating the activity instance upon a configuration change. 4740 * 4741 * @param newConfig The new resource configuration. 4742 */ 4743 protected void onConfigurationChanged(Configuration newConfig) { 4744 } 4745 4746 /** 4747 * Private function to aggregate all per-view attributes in to the view 4748 * root. 4749 */ 4750 void dispatchCollectViewAttributes(int visibility) { 4751 performCollectViewAttributes(visibility); 4752 } 4753 4754 void performCollectViewAttributes(int visibility) { 4755 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 4756 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 4757 mAttachInfo.mKeepScreenOn = true; 4758 } 4759 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 4760 if (mOnSystemUiVisibilityChangeListener != null) { 4761 mAttachInfo.mHasSystemUiListeners = true; 4762 } 4763 } 4764 } 4765 4766 void needGlobalAttributesUpdate(boolean force) { 4767 final AttachInfo ai = mAttachInfo; 4768 if (ai != null) { 4769 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 4770 || ai.mHasSystemUiListeners) { 4771 ai.mRecomputeGlobalAttributes = true; 4772 } 4773 } 4774 } 4775 4776 /** 4777 * Returns whether the device is currently in touch mode. Touch mode is entered 4778 * once the user begins interacting with the device by touch, and affects various 4779 * things like whether focus is always visible to the user. 4780 * 4781 * @return Whether the device is in touch mode. 4782 */ 4783 @ViewDebug.ExportedProperty 4784 public boolean isInTouchMode() { 4785 if (mAttachInfo != null) { 4786 return mAttachInfo.mInTouchMode; 4787 } else { 4788 return ViewRoot.isInTouchMode(); 4789 } 4790 } 4791 4792 /** 4793 * Returns the context the view is running in, through which it can 4794 * access the current theme, resources, etc. 4795 * 4796 * @return The view's Context. 4797 */ 4798 @ViewDebug.CapturedViewProperty 4799 public final Context getContext() { 4800 return mContext; 4801 } 4802 4803 /** 4804 * Handle a key event before it is processed by any input method 4805 * associated with the view hierarchy. This can be used to intercept 4806 * key events in special situations before the IME consumes them; a 4807 * typical example would be handling the BACK key to update the application's 4808 * UI instead of allowing the IME to see it and close itself. 4809 * 4810 * @param keyCode The value in event.getKeyCode(). 4811 * @param event Description of the key event. 4812 * @return If you handled the event, return true. If you want to allow the 4813 * event to be handled by the next receiver, return false. 4814 */ 4815 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4816 return false; 4817 } 4818 4819 /** 4820 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 4821 * KeyEvent.Callback.onKeyDown()}: perform press of the view 4822 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4823 * is released, if the view is enabled and clickable. 4824 * 4825 * @param keyCode A key code that represents the button pressed, from 4826 * {@link android.view.KeyEvent}. 4827 * @param event The KeyEvent object that defines the button action. 4828 */ 4829 public boolean onKeyDown(int keyCode, KeyEvent event) { 4830 boolean result = false; 4831 4832 switch (keyCode) { 4833 case KeyEvent.KEYCODE_DPAD_CENTER: 4834 case KeyEvent.KEYCODE_ENTER: { 4835 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4836 return true; 4837 } 4838 // Long clickable items don't necessarily have to be clickable 4839 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4840 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4841 (event.getRepeatCount() == 0)) { 4842 setPressed(true); 4843 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4844 postCheckForLongClick(0); 4845 } 4846 return true; 4847 } 4848 break; 4849 } 4850 } 4851 return result; 4852 } 4853 4854 /** 4855 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4856 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4857 * the event). 4858 */ 4859 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 4860 return false; 4861 } 4862 4863 /** 4864 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 4865 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 4866 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 4867 * {@link KeyEvent#KEYCODE_ENTER} is released. 4868 * 4869 * @param keyCode A key code that represents the button pressed, from 4870 * {@link android.view.KeyEvent}. 4871 * @param event The KeyEvent object that defines the button action. 4872 */ 4873 public boolean onKeyUp(int keyCode, KeyEvent event) { 4874 boolean result = false; 4875 4876 switch (keyCode) { 4877 case KeyEvent.KEYCODE_DPAD_CENTER: 4878 case KeyEvent.KEYCODE_ENTER: { 4879 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4880 return true; 4881 } 4882 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 4883 setPressed(false); 4884 4885 if (!mHasPerformedLongPress) { 4886 // This is a tap, so remove the longpress check 4887 removeLongPressCallback(); 4888 4889 result = performClick(); 4890 } 4891 } 4892 break; 4893 } 4894 } 4895 return result; 4896 } 4897 4898 /** 4899 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4900 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 4901 * the event). 4902 * 4903 * @param keyCode A key code that represents the button pressed, from 4904 * {@link android.view.KeyEvent}. 4905 * @param repeatCount The number of times the action was made. 4906 * @param event The KeyEvent object that defines the button action. 4907 */ 4908 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 4909 return false; 4910 } 4911 4912 /** 4913 * Called on the focused view when a key shortcut event is not handled. 4914 * Override this method to implement local key shortcuts for the View. 4915 * Key shortcuts can also be implemented by setting the 4916 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 4917 * 4918 * @param keyCode The value in event.getKeyCode(). 4919 * @param event Description of the key event. 4920 * @return If you handled the event, return true. If you want to allow the 4921 * event to be handled by the next receiver, return false. 4922 */ 4923 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 4924 return false; 4925 } 4926 4927 /** 4928 * Check whether the called view is a text editor, in which case it 4929 * would make sense to automatically display a soft input window for 4930 * it. Subclasses should override this if they implement 4931 * {@link #onCreateInputConnection(EditorInfo)} to return true if 4932 * a call on that method would return a non-null InputConnection, and 4933 * they are really a first-class editor that the user would normally 4934 * start typing on when the go into a window containing your view. 4935 * 4936 * <p>The default implementation always returns false. This does 4937 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 4938 * will not be called or the user can not otherwise perform edits on your 4939 * view; it is just a hint to the system that this is not the primary 4940 * purpose of this view. 4941 * 4942 * @return Returns true if this view is a text editor, else false. 4943 */ 4944 public boolean onCheckIsTextEditor() { 4945 return false; 4946 } 4947 4948 /** 4949 * Create a new InputConnection for an InputMethod to interact 4950 * with the view. The default implementation returns null, since it doesn't 4951 * support input methods. You can override this to implement such support. 4952 * This is only needed for views that take focus and text input. 4953 * 4954 * <p>When implementing this, you probably also want to implement 4955 * {@link #onCheckIsTextEditor()} to indicate you will return a 4956 * non-null InputConnection. 4957 * 4958 * @param outAttrs Fill in with attribute information about the connection. 4959 */ 4960 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 4961 return null; 4962 } 4963 4964 /** 4965 * Called by the {@link android.view.inputmethod.InputMethodManager} 4966 * when a view who is not the current 4967 * input connection target is trying to make a call on the manager. The 4968 * default implementation returns false; you can override this to return 4969 * true for certain views if you are performing InputConnection proxying 4970 * to them. 4971 * @param view The View that is making the InputMethodManager call. 4972 * @return Return true to allow the call, false to reject. 4973 */ 4974 public boolean checkInputConnectionProxy(View view) { 4975 return false; 4976 } 4977 4978 /** 4979 * Show the context menu for this view. It is not safe to hold on to the 4980 * menu after returning from this method. 4981 * 4982 * You should normally not overload this method. Overload 4983 * {@link #onCreateContextMenu(ContextMenu)} or define an 4984 * {@link OnCreateContextMenuListener} to add items to the context menu. 4985 * 4986 * @param menu The context menu to populate 4987 */ 4988 public void createContextMenu(ContextMenu menu) { 4989 ContextMenuInfo menuInfo = getContextMenuInfo(); 4990 4991 // Sets the current menu info so all items added to menu will have 4992 // my extra info set. 4993 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 4994 4995 onCreateContextMenu(menu); 4996 if (mOnCreateContextMenuListener != null) { 4997 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 4998 } 4999 5000 // Clear the extra information so subsequent items that aren't mine don't 5001 // have my extra info. 5002 ((MenuBuilder)menu).setCurrentMenuInfo(null); 5003 5004 if (mParent != null) { 5005 mParent.createContextMenu(menu); 5006 } 5007 } 5008 5009 /** 5010 * Views should implement this if they have extra information to associate 5011 * with the context menu. The return result is supplied as a parameter to 5012 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 5013 * callback. 5014 * 5015 * @return Extra information about the item for which the context menu 5016 * should be shown. This information will vary across different 5017 * subclasses of View. 5018 */ 5019 protected ContextMenuInfo getContextMenuInfo() { 5020 return null; 5021 } 5022 5023 /** 5024 * Views should implement this if the view itself is going to add items to 5025 * the context menu. 5026 * 5027 * @param menu the context menu to populate 5028 */ 5029 protected void onCreateContextMenu(ContextMenu menu) { 5030 } 5031 5032 /** 5033 * Implement this method to handle trackball motion events. The 5034 * <em>relative</em> movement of the trackball since the last event 5035 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 5036 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 5037 * that a movement of 1 corresponds to the user pressing one DPAD key (so 5038 * they will often be fractional values, representing the more fine-grained 5039 * movement information available from a trackball). 5040 * 5041 * @param event The motion event. 5042 * @return True if the event was handled, false otherwise. 5043 */ 5044 public boolean onTrackballEvent(MotionEvent event) { 5045 return false; 5046 } 5047 5048 /** 5049 * Implement this method to handle generic motion events. 5050 * <p> 5051 * Generic motion events are dispatched to the focused view to describe 5052 * the motions of input devices such as joysticks. The 5053 * {@link MotionEvent#getSource() source} of the motion event specifies 5054 * the class of input that was received. Implementations of this method 5055 * must examine the bits in the source before processing the event. 5056 * The following code example shows how this is done. 5057 * </p> 5058 * <code> 5059 * public boolean onGenericMotionEvent(MotionEvent event) { 5060 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 5061 * float x = event.getX(); 5062 * float y = event.getY(); 5063 * // process the joystick motion 5064 * return true; 5065 * } 5066 * return super.onGenericMotionEvent(event); 5067 * } 5068 * </code> 5069 * 5070 * @param event The generic motion event being processed. 5071 * 5072 * @return Return true if you have consumed the event, false if you haven't. 5073 * The default implementation always returns false. 5074 */ 5075 public boolean onGenericMotionEvent(MotionEvent event) { 5076 return false; 5077 } 5078 5079 /** 5080 * Implement this method to handle touch screen motion events. 5081 * 5082 * @param event The motion event. 5083 * @return True if the event was handled, false otherwise. 5084 */ 5085 public boolean onTouchEvent(MotionEvent event) { 5086 final int viewFlags = mViewFlags; 5087 5088 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5089 // A disabled view that is clickable still consumes the touch 5090 // events, it just doesn't respond to them. 5091 return (((viewFlags & CLICKABLE) == CLICKABLE || 5092 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5093 } 5094 5095 if (mTouchDelegate != null) { 5096 if (mTouchDelegate.onTouchEvent(event)) { 5097 return true; 5098 } 5099 } 5100 5101 if (((viewFlags & CLICKABLE) == CLICKABLE || 5102 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5103 switch (event.getAction()) { 5104 case MotionEvent.ACTION_UP: 5105 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5106 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5107 // take focus if we don't have it already and we should in 5108 // touch mode. 5109 boolean focusTaken = false; 5110 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5111 focusTaken = requestFocus(); 5112 } 5113 5114 if (prepressed) { 5115 // The button is being released before we actually 5116 // showed it as pressed. Make it show the pressed 5117 // state now (before scheduling the click) to ensure 5118 // the user sees it. 5119 mPrivateFlags |= PRESSED; 5120 refreshDrawableState(); 5121 } 5122 5123 if (!mHasPerformedLongPress) { 5124 // This is a tap, so remove the longpress check 5125 removeLongPressCallback(); 5126 5127 // Only perform take click actions if we were in the pressed state 5128 if (!focusTaken) { 5129 // Use a Runnable and post this rather than calling 5130 // performClick directly. This lets other visual state 5131 // of the view update before click actions start. 5132 if (mPerformClick == null) { 5133 mPerformClick = new PerformClick(); 5134 } 5135 if (!post(mPerformClick)) { 5136 performClick(); 5137 } 5138 } 5139 } 5140 5141 if (mUnsetPressedState == null) { 5142 mUnsetPressedState = new UnsetPressedState(); 5143 } 5144 5145 if (prepressed) { 5146 postDelayed(mUnsetPressedState, 5147 ViewConfiguration.getPressedStateDuration()); 5148 } else if (!post(mUnsetPressedState)) { 5149 // If the post failed, unpress right now 5150 mUnsetPressedState.run(); 5151 } 5152 removeTapCallback(); 5153 } 5154 break; 5155 5156 case MotionEvent.ACTION_DOWN: 5157 if (mPendingCheckForTap == null) { 5158 mPendingCheckForTap = new CheckForTap(); 5159 } 5160 mPrivateFlags |= PREPRESSED; 5161 mHasPerformedLongPress = false; 5162 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5163 break; 5164 5165 case MotionEvent.ACTION_CANCEL: 5166 mPrivateFlags &= ~PRESSED; 5167 refreshDrawableState(); 5168 removeTapCallback(); 5169 break; 5170 5171 case MotionEvent.ACTION_MOVE: 5172 final int x = (int) event.getX(); 5173 final int y = (int) event.getY(); 5174 5175 // Be lenient about moving outside of buttons 5176 if (!pointInView(x, y, mTouchSlop)) { 5177 // Outside button 5178 removeTapCallback(); 5179 if ((mPrivateFlags & PRESSED) != 0) { 5180 // Remove any future long press/tap checks 5181 removeLongPressCallback(); 5182 5183 // Need to switch from pressed to not pressed 5184 mPrivateFlags &= ~PRESSED; 5185 refreshDrawableState(); 5186 } 5187 } 5188 break; 5189 } 5190 return true; 5191 } 5192 5193 return false; 5194 } 5195 5196 /** 5197 * Remove the longpress detection timer. 5198 */ 5199 private void removeLongPressCallback() { 5200 if (mPendingCheckForLongPress != null) { 5201 removeCallbacks(mPendingCheckForLongPress); 5202 } 5203 } 5204 5205 /** 5206 * Remove the pending click action 5207 */ 5208 private void removePerformClickCallback() { 5209 if (mPerformClick != null) { 5210 removeCallbacks(mPerformClick); 5211 } 5212 } 5213 5214 /** 5215 * Remove the prepress detection timer. 5216 */ 5217 private void removeUnsetPressCallback() { 5218 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5219 setPressed(false); 5220 removeCallbacks(mUnsetPressedState); 5221 } 5222 } 5223 5224 /** 5225 * Remove the tap detection timer. 5226 */ 5227 private void removeTapCallback() { 5228 if (mPendingCheckForTap != null) { 5229 mPrivateFlags &= ~PREPRESSED; 5230 removeCallbacks(mPendingCheckForTap); 5231 } 5232 } 5233 5234 /** 5235 * Cancels a pending long press. Your subclass can use this if you 5236 * want the context menu to come up if the user presses and holds 5237 * at the same place, but you don't want it to come up if they press 5238 * and then move around enough to cause scrolling. 5239 */ 5240 public void cancelLongPress() { 5241 removeLongPressCallback(); 5242 5243 /* 5244 * The prepressed state handled by the tap callback is a display 5245 * construct, but the tap callback will post a long press callback 5246 * less its own timeout. Remove it here. 5247 */ 5248 removeTapCallback(); 5249 } 5250 5251 /** 5252 * Sets the TouchDelegate for this View. 5253 */ 5254 public void setTouchDelegate(TouchDelegate delegate) { 5255 mTouchDelegate = delegate; 5256 } 5257 5258 /** 5259 * Gets the TouchDelegate for this View. 5260 */ 5261 public TouchDelegate getTouchDelegate() { 5262 return mTouchDelegate; 5263 } 5264 5265 /** 5266 * Set flags controlling behavior of this view. 5267 * 5268 * @param flags Constant indicating the value which should be set 5269 * @param mask Constant indicating the bit range that should be changed 5270 */ 5271 void setFlags(int flags, int mask) { 5272 int old = mViewFlags; 5273 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5274 5275 int changed = mViewFlags ^ old; 5276 if (changed == 0) { 5277 return; 5278 } 5279 int privateFlags = mPrivateFlags; 5280 5281 /* Check if the FOCUSABLE bit has changed */ 5282 if (((changed & FOCUSABLE_MASK) != 0) && 5283 ((privateFlags & HAS_BOUNDS) !=0)) { 5284 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5285 && ((privateFlags & FOCUSED) != 0)) { 5286 /* Give up focus if we are no longer focusable */ 5287 clearFocus(); 5288 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 5289 && ((privateFlags & FOCUSED) == 0)) { 5290 /* 5291 * Tell the view system that we are now available to take focus 5292 * if no one else already has it. 5293 */ 5294 if (mParent != null) mParent.focusableViewAvailable(this); 5295 } 5296 } 5297 5298 if ((flags & VISIBILITY_MASK) == VISIBLE) { 5299 if ((changed & VISIBILITY_MASK) != 0) { 5300 /* 5301 * If this view is becoming visible, set the DRAWN flag so that 5302 * the next invalidate() will not be skipped. 5303 */ 5304 mPrivateFlags |= DRAWN; 5305 5306 needGlobalAttributesUpdate(true); 5307 5308 // a view becoming visible is worth notifying the parent 5309 // about in case nothing has focus. even if this specific view 5310 // isn't focusable, it may contain something that is, so let 5311 // the root view try to give this focus if nothing else does. 5312 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 5313 mParent.focusableViewAvailable(this); 5314 } 5315 } 5316 } 5317 5318 /* Check if the GONE bit has changed */ 5319 if ((changed & GONE) != 0) { 5320 needGlobalAttributesUpdate(false); 5321 requestLayout(); 5322 invalidate(true); 5323 5324 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 5325 if (hasFocus()) clearFocus(); 5326 destroyDrawingCache(); 5327 } 5328 if (mAttachInfo != null) { 5329 mAttachInfo.mViewVisibilityChanged = true; 5330 } 5331 } 5332 5333 /* Check if the VISIBLE bit has changed */ 5334 if ((changed & INVISIBLE) != 0) { 5335 needGlobalAttributesUpdate(false); 5336 invalidate(true); 5337 5338 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 5339 // root view becoming invisible shouldn't clear focus 5340 if (getRootView() != this) { 5341 clearFocus(); 5342 } 5343 } 5344 if (mAttachInfo != null) { 5345 mAttachInfo.mViewVisibilityChanged = true; 5346 } 5347 } 5348 5349 if ((changed & VISIBILITY_MASK) != 0) { 5350 if (mParent instanceof ViewGroup) { 5351 ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5352 ((View) mParent).invalidate(true); 5353 } 5354 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5355 } 5356 5357 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 5358 destroyDrawingCache(); 5359 } 5360 5361 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 5362 destroyDrawingCache(); 5363 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5364 invalidateParentCaches(); 5365 } 5366 5367 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 5368 destroyDrawingCache(); 5369 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5370 } 5371 5372 if ((changed & DRAW_MASK) != 0) { 5373 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 5374 if (mBGDrawable != null) { 5375 mPrivateFlags &= ~SKIP_DRAW; 5376 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 5377 } else { 5378 mPrivateFlags |= SKIP_DRAW; 5379 } 5380 } else { 5381 mPrivateFlags &= ~SKIP_DRAW; 5382 } 5383 requestLayout(); 5384 invalidate(true); 5385 } 5386 5387 if ((changed & KEEP_SCREEN_ON) != 0) { 5388 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 5389 mParent.recomputeViewAttributes(this); 5390 } 5391 } 5392 } 5393 5394 /** 5395 * Change the view's z order in the tree, so it's on top of other sibling 5396 * views 5397 */ 5398 public void bringToFront() { 5399 if (mParent != null) { 5400 mParent.bringChildToFront(this); 5401 } 5402 } 5403 5404 /** 5405 * This is called in response to an internal scroll in this view (i.e., the 5406 * view scrolled its own contents). This is typically as a result of 5407 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 5408 * called. 5409 * 5410 * @param l Current horizontal scroll origin. 5411 * @param t Current vertical scroll origin. 5412 * @param oldl Previous horizontal scroll origin. 5413 * @param oldt Previous vertical scroll origin. 5414 */ 5415 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 5416 mBackgroundSizeChanged = true; 5417 5418 final AttachInfo ai = mAttachInfo; 5419 if (ai != null) { 5420 ai.mViewScrollChanged = true; 5421 } 5422 } 5423 5424 /** 5425 * Interface definition for a callback to be invoked when the layout bounds of a view 5426 * changes due to layout processing. 5427 */ 5428 public interface OnLayoutChangeListener { 5429 /** 5430 * Called when the focus state of a view has changed. 5431 * 5432 * @param v The view whose state has changed. 5433 * @param left The new value of the view's left property. 5434 * @param top The new value of the view's top property. 5435 * @param right The new value of the view's right property. 5436 * @param bottom The new value of the view's bottom property. 5437 * @param oldLeft The previous value of the view's left property. 5438 * @param oldTop The previous value of the view's top property. 5439 * @param oldRight The previous value of the view's right property. 5440 * @param oldBottom The previous value of the view's bottom property. 5441 */ 5442 void onLayoutChange(View v, int left, int top, int right, int bottom, 5443 int oldLeft, int oldTop, int oldRight, int oldBottom); 5444 } 5445 5446 /** 5447 * This is called during layout when the size of this view has changed. If 5448 * you were just added to the view hierarchy, you're called with the old 5449 * values of 0. 5450 * 5451 * @param w Current width of this view. 5452 * @param h Current height of this view. 5453 * @param oldw Old width of this view. 5454 * @param oldh Old height of this view. 5455 */ 5456 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5457 } 5458 5459 /** 5460 * Called by draw to draw the child views. This may be overridden 5461 * by derived classes to gain control just before its children are drawn 5462 * (but after its own view has been drawn). 5463 * @param canvas the canvas on which to draw the view 5464 */ 5465 protected void dispatchDraw(Canvas canvas) { 5466 } 5467 5468 /** 5469 * Gets the parent of this view. Note that the parent is a 5470 * ViewParent and not necessarily a View. 5471 * 5472 * @return Parent of this view. 5473 */ 5474 public final ViewParent getParent() { 5475 return mParent; 5476 } 5477 5478 /** 5479 * Return the scrolled left position of this view. This is the left edge of 5480 * the displayed part of your view. You do not need to draw any pixels 5481 * farther left, since those are outside of the frame of your view on 5482 * screen. 5483 * 5484 * @return The left edge of the displayed part of your view, in pixels. 5485 */ 5486 public final int getScrollX() { 5487 return mScrollX; 5488 } 5489 5490 /** 5491 * Return the scrolled top position of this view. This is the top edge of 5492 * the displayed part of your view. You do not need to draw any pixels above 5493 * it, since those are outside of the frame of your view on screen. 5494 * 5495 * @return The top edge of the displayed part of your view, in pixels. 5496 */ 5497 public final int getScrollY() { 5498 return mScrollY; 5499 } 5500 5501 /** 5502 * Return the width of the your view. 5503 * 5504 * @return The width of your view, in pixels. 5505 */ 5506 @ViewDebug.ExportedProperty(category = "layout") 5507 public final int getWidth() { 5508 return mRight - mLeft; 5509 } 5510 5511 /** 5512 * Return the height of your view. 5513 * 5514 * @return The height of your view, in pixels. 5515 */ 5516 @ViewDebug.ExportedProperty(category = "layout") 5517 public final int getHeight() { 5518 return mBottom - mTop; 5519 } 5520 5521 /** 5522 * Return the visible drawing bounds of your view. Fills in the output 5523 * rectangle with the values from getScrollX(), getScrollY(), 5524 * getWidth(), and getHeight(). 5525 * 5526 * @param outRect The (scrolled) drawing bounds of the view. 5527 */ 5528 public void getDrawingRect(Rect outRect) { 5529 outRect.left = mScrollX; 5530 outRect.top = mScrollY; 5531 outRect.right = mScrollX + (mRight - mLeft); 5532 outRect.bottom = mScrollY + (mBottom - mTop); 5533 } 5534 5535 /** 5536 * Like {@link #getMeasuredWidthAndState()}, but only returns the 5537 * raw width component (that is the result is masked by 5538 * {@link #MEASURED_SIZE_MASK}). 5539 * 5540 * @return The raw measured width of this view. 5541 */ 5542 public final int getMeasuredWidth() { 5543 return mMeasuredWidth & MEASURED_SIZE_MASK; 5544 } 5545 5546 /** 5547 * Return the full width measurement information for this view as computed 5548 * by the most recent call to {@link #measure}. This result is a bit mask 5549 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5550 * This should be used during measurement and layout calculations only. Use 5551 * {@link #getWidth()} to see how wide a view is after layout. 5552 * 5553 * @return The measured width of this view as a bit mask. 5554 */ 5555 public final int getMeasuredWidthAndState() { 5556 return mMeasuredWidth; 5557 } 5558 5559 /** 5560 * Like {@link #getMeasuredHeightAndState()}, but only returns the 5561 * raw width component (that is the result is masked by 5562 * {@link #MEASURED_SIZE_MASK}). 5563 * 5564 * @return The raw measured height of this view. 5565 */ 5566 public final int getMeasuredHeight() { 5567 return mMeasuredHeight & MEASURED_SIZE_MASK; 5568 } 5569 5570 /** 5571 * Return the full height measurement information for this view as computed 5572 * by the most recent call to {@link #measure}. This result is a bit mask 5573 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5574 * This should be used during measurement and layout calculations only. Use 5575 * {@link #getHeight()} to see how wide a view is after layout. 5576 * 5577 * @return The measured width of this view as a bit mask. 5578 */ 5579 public final int getMeasuredHeightAndState() { 5580 return mMeasuredHeight; 5581 } 5582 5583 /** 5584 * Return only the state bits of {@link #getMeasuredWidthAndState()} 5585 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 5586 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 5587 * and the height component is at the shifted bits 5588 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 5589 */ 5590 public final int getMeasuredState() { 5591 return (mMeasuredWidth&MEASURED_STATE_MASK) 5592 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 5593 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 5594 } 5595 5596 /** 5597 * The transform matrix of this view, which is calculated based on the current 5598 * roation, scale, and pivot properties. 5599 * 5600 * @see #getRotation() 5601 * @see #getScaleX() 5602 * @see #getScaleY() 5603 * @see #getPivotX() 5604 * @see #getPivotY() 5605 * @return The current transform matrix for the view 5606 */ 5607 public Matrix getMatrix() { 5608 updateMatrix(); 5609 return mMatrix; 5610 } 5611 5612 /** 5613 * Utility function to determine if the value is far enough away from zero to be 5614 * considered non-zero. 5615 * @param value A floating point value to check for zero-ness 5616 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5617 */ 5618 private static boolean nonzero(float value) { 5619 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5620 } 5621 5622 /** 5623 * Returns true if the transform matrix is the identity matrix. 5624 * Recomputes the matrix if necessary. 5625 * 5626 * @return True if the transform matrix is the identity matrix, false otherwise. 5627 */ 5628 final boolean hasIdentityMatrix() { 5629 updateMatrix(); 5630 return mMatrixIsIdentity; 5631 } 5632 5633 /** 5634 * Recomputes the transform matrix if necessary. 5635 */ 5636 private void updateMatrix() { 5637 if (mMatrixDirty) { 5638 // transform-related properties have changed since the last time someone 5639 // asked for the matrix; recalculate it with the current values 5640 5641 // Figure out if we need to update the pivot point 5642 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5643 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 5644 mPrevWidth = mRight - mLeft; 5645 mPrevHeight = mBottom - mTop; 5646 mPivotX = mPrevWidth / 2f; 5647 mPivotY = mPrevHeight / 2f; 5648 } 5649 } 5650 mMatrix.reset(); 5651 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5652 mMatrix.setTranslate(mTranslationX, mTranslationY); 5653 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5654 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5655 } else { 5656 if (mCamera == null) { 5657 mCamera = new Camera(); 5658 matrix3D = new Matrix(); 5659 } 5660 mCamera.save(); 5661 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5662 mCamera.rotateX(mRotationX); 5663 mCamera.rotateY(mRotationY); 5664 mCamera.rotateZ(-mRotation); 5665 mCamera.getMatrix(matrix3D); 5666 matrix3D.preTranslate(-mPivotX, -mPivotY); 5667 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5668 mMatrix.postConcat(matrix3D); 5669 mCamera.restore(); 5670 } 5671 mMatrixDirty = false; 5672 mMatrixIsIdentity = mMatrix.isIdentity(); 5673 mInverseMatrixDirty = true; 5674 } 5675 } 5676 5677 /** 5678 * Utility method to retrieve the inverse of the current mMatrix property. 5679 * We cache the matrix to avoid recalculating it when transform properties 5680 * have not changed. 5681 * 5682 * @return The inverse of the current matrix of this view. 5683 */ 5684 final Matrix getInverseMatrix() { 5685 updateMatrix(); 5686 if (mInverseMatrixDirty) { 5687 if (mInverseMatrix == null) { 5688 mInverseMatrix = new Matrix(); 5689 } 5690 mMatrix.invert(mInverseMatrix); 5691 mInverseMatrixDirty = false; 5692 } 5693 return mInverseMatrix; 5694 } 5695 5696 /** 5697 * The degrees that the view is rotated around the pivot point. 5698 * 5699 * @see #getPivotX() 5700 * @see #getPivotY() 5701 * @return The degrees of rotation. 5702 */ 5703 public float getRotation() { 5704 return mRotation; 5705 } 5706 5707 /** 5708 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5709 * result in clockwise rotation. 5710 * 5711 * @param rotation The degrees of rotation. 5712 * @see #getPivotX() 5713 * @see #getPivotY() 5714 * 5715 * @attr ref android.R.styleable#View_rotation 5716 */ 5717 public void setRotation(float rotation) { 5718 if (mRotation != rotation) { 5719 invalidateParentCaches(); 5720 // Double-invalidation is necessary to capture view's old and new areas 5721 invalidate(false); 5722 mRotation = rotation; 5723 mMatrixDirty = true; 5724 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5725 invalidate(false); 5726 } 5727 } 5728 5729 /** 5730 * The degrees that the view is rotated around the vertical axis through the pivot point. 5731 * 5732 * @see #getPivotX() 5733 * @see #getPivotY() 5734 * @return The degrees of Y rotation. 5735 */ 5736 public float getRotationY() { 5737 return mRotationY; 5738 } 5739 5740 /** 5741 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5742 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5743 * down the y axis. 5744 * 5745 * @param rotationY The degrees of Y rotation. 5746 * @see #getPivotX() 5747 * @see #getPivotY() 5748 * 5749 * @attr ref android.R.styleable#View_rotationY 5750 */ 5751 public void setRotationY(float rotationY) { 5752 if (mRotationY != rotationY) { 5753 invalidateParentCaches(); 5754 // Double-invalidation is necessary to capture view's old and new areas 5755 invalidate(false); 5756 mRotationY = rotationY; 5757 mMatrixDirty = true; 5758 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5759 invalidate(false); 5760 } 5761 } 5762 5763 /** 5764 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5765 * 5766 * @see #getPivotX() 5767 * @see #getPivotY() 5768 * @return The degrees of X rotation. 5769 */ 5770 public float getRotationX() { 5771 return mRotationX; 5772 } 5773 5774 /** 5775 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 5776 * Increasing values result in clockwise rotation from the viewpoint of looking down the 5777 * x axis. 5778 * 5779 * @param rotationX The degrees of X rotation. 5780 * @see #getPivotX() 5781 * @see #getPivotY() 5782 * 5783 * @attr ref android.R.styleable#View_rotationX 5784 */ 5785 public void setRotationX(float rotationX) { 5786 if (mRotationX != rotationX) { 5787 invalidateParentCaches(); 5788 // Double-invalidation is necessary to capture view's old and new areas 5789 invalidate(false); 5790 mRotationX = rotationX; 5791 mMatrixDirty = true; 5792 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5793 invalidate(false); 5794 } 5795 } 5796 5797 /** 5798 * The amount that the view is scaled in x around the pivot point, as a proportion of 5799 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 5800 * 5801 * <p>By default, this is 1.0f. 5802 * 5803 * @see #getPivotX() 5804 * @see #getPivotY() 5805 * @return The scaling factor. 5806 */ 5807 public float getScaleX() { 5808 return mScaleX; 5809 } 5810 5811 /** 5812 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 5813 * the view's unscaled width. A value of 1 means that no scaling is applied. 5814 * 5815 * @param scaleX The scaling factor. 5816 * @see #getPivotX() 5817 * @see #getPivotY() 5818 * 5819 * @attr ref android.R.styleable#View_scaleX 5820 */ 5821 public void setScaleX(float scaleX) { 5822 if (mScaleX != scaleX) { 5823 invalidateParentCaches(); 5824 // Double-invalidation is necessary to capture view's old and new areas 5825 invalidate(false); 5826 mScaleX = scaleX; 5827 mMatrixDirty = true; 5828 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5829 invalidate(false); 5830 } 5831 } 5832 5833 /** 5834 * The amount that the view is scaled in y around the pivot point, as a proportion of 5835 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 5836 * 5837 * <p>By default, this is 1.0f. 5838 * 5839 * @see #getPivotX() 5840 * @see #getPivotY() 5841 * @return The scaling factor. 5842 */ 5843 public float getScaleY() { 5844 return mScaleY; 5845 } 5846 5847 /** 5848 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 5849 * the view's unscaled width. A value of 1 means that no scaling is applied. 5850 * 5851 * @param scaleY The scaling factor. 5852 * @see #getPivotX() 5853 * @see #getPivotY() 5854 * 5855 * @attr ref android.R.styleable#View_scaleY 5856 */ 5857 public void setScaleY(float scaleY) { 5858 if (mScaleY != scaleY) { 5859 invalidateParentCaches(); 5860 // Double-invalidation is necessary to capture view's old and new areas 5861 invalidate(false); 5862 mScaleY = scaleY; 5863 mMatrixDirty = true; 5864 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5865 invalidate(false); 5866 } 5867 } 5868 5869 /** 5870 * The x location of the point around which the view is {@link #setRotation(float) rotated} 5871 * and {@link #setScaleX(float) scaled}. 5872 * 5873 * @see #getRotation() 5874 * @see #getScaleX() 5875 * @see #getScaleY() 5876 * @see #getPivotY() 5877 * @return The x location of the pivot point. 5878 */ 5879 public float getPivotX() { 5880 return mPivotX; 5881 } 5882 5883 /** 5884 * Sets the x location of the point around which the view is 5885 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 5886 * By default, the pivot point is centered on the object. 5887 * Setting this property disables this behavior and causes the view to use only the 5888 * explicitly set pivotX and pivotY values. 5889 * 5890 * @param pivotX The x location of the pivot point. 5891 * @see #getRotation() 5892 * @see #getScaleX() 5893 * @see #getScaleY() 5894 * @see #getPivotY() 5895 * 5896 * @attr ref android.R.styleable#View_transformPivotX 5897 */ 5898 public void setPivotX(float pivotX) { 5899 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5900 if (mPivotX != pivotX) { 5901 invalidateParentCaches(); 5902 // Double-invalidation is necessary to capture view's old and new areas 5903 invalidate(false); 5904 mPivotX = pivotX; 5905 mMatrixDirty = true; 5906 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5907 invalidate(false); 5908 } 5909 } 5910 5911 /** 5912 * The y location of the point around which the view is {@link #setRotation(float) rotated} 5913 * and {@link #setScaleY(float) scaled}. 5914 * 5915 * @see #getRotation() 5916 * @see #getScaleX() 5917 * @see #getScaleY() 5918 * @see #getPivotY() 5919 * @return The y location of the pivot point. 5920 */ 5921 public float getPivotY() { 5922 return mPivotY; 5923 } 5924 5925 /** 5926 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 5927 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 5928 * Setting this property disables this behavior and causes the view to use only the 5929 * explicitly set pivotX and pivotY values. 5930 * 5931 * @param pivotY The y location of the pivot point. 5932 * @see #getRotation() 5933 * @see #getScaleX() 5934 * @see #getScaleY() 5935 * @see #getPivotY() 5936 * 5937 * @attr ref android.R.styleable#View_transformPivotY 5938 */ 5939 public void setPivotY(float pivotY) { 5940 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5941 if (mPivotY != pivotY) { 5942 invalidateParentCaches(); 5943 // Double-invalidation is necessary to capture view's old and new areas 5944 invalidate(false); 5945 mPivotY = pivotY; 5946 mMatrixDirty = true; 5947 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5948 invalidate(false); 5949 } 5950 } 5951 5952 /** 5953 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 5954 * completely transparent and 1 means the view is completely opaque. 5955 * 5956 * <p>By default this is 1.0f. 5957 * @return The opacity of the view. 5958 */ 5959 public float getAlpha() { 5960 return mAlpha; 5961 } 5962 5963 /** 5964 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 5965 * completely transparent and 1 means the view is completely opaque.</p> 5966 * 5967 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 5968 * responsible for applying the opacity itself. Otherwise, calling this method is 5969 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 5970 * setting a hardware layer.</p> 5971 * 5972 * @param alpha The opacity of the view. 5973 * 5974 * @see #setLayerType(int, android.graphics.Paint) 5975 * 5976 * @attr ref android.R.styleable#View_alpha 5977 */ 5978 public void setAlpha(float alpha) { 5979 mAlpha = alpha; 5980 invalidateParentCaches(); 5981 if (onSetAlpha((int) (alpha * 255))) { 5982 mPrivateFlags |= ALPHA_SET; 5983 // subclass is handling alpha - don't optimize rendering cache invalidation 5984 invalidate(true); 5985 } else { 5986 mPrivateFlags &= ~ALPHA_SET; 5987 invalidate(false); 5988 } 5989 } 5990 5991 /** 5992 * Top position of this view relative to its parent. 5993 * 5994 * @return The top of this view, in pixels. 5995 */ 5996 @ViewDebug.CapturedViewProperty 5997 public final int getTop() { 5998 return mTop; 5999 } 6000 6001 /** 6002 * Sets the top position of this view relative to its parent. This method is meant to be called 6003 * by the layout system and should not generally be called otherwise, because the property 6004 * may be changed at any time by the layout. 6005 * 6006 * @param top The top of this view, in pixels. 6007 */ 6008 public final void setTop(int top) { 6009 if (top != mTop) { 6010 updateMatrix(); 6011 if (mMatrixIsIdentity) { 6012 final ViewParent p = mParent; 6013 if (p != null && mAttachInfo != null) { 6014 final Rect r = mAttachInfo.mTmpInvalRect; 6015 int minTop; 6016 int yLoc; 6017 if (top < mTop) { 6018 minTop = top; 6019 yLoc = top - mTop; 6020 } else { 6021 minTop = mTop; 6022 yLoc = 0; 6023 } 6024 r.set(0, yLoc, mRight - mLeft, mBottom - minTop); 6025 p.invalidateChild(this, r); 6026 } 6027 } else { 6028 // Double-invalidation is necessary to capture view's old and new areas 6029 invalidate(true); 6030 } 6031 6032 int width = mRight - mLeft; 6033 int oldHeight = mBottom - mTop; 6034 6035 mTop = top; 6036 6037 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6038 6039 if (!mMatrixIsIdentity) { 6040 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6041 // A change in dimension means an auto-centered pivot point changes, too 6042 mMatrixDirty = true; 6043 } 6044 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6045 invalidate(true); 6046 } 6047 mBackgroundSizeChanged = true; 6048 invalidateParentIfNeeded(); 6049 } 6050 } 6051 6052 /** 6053 * Bottom position of this view relative to its parent. 6054 * 6055 * @return The bottom of this view, in pixels. 6056 */ 6057 @ViewDebug.CapturedViewProperty 6058 public final int getBottom() { 6059 return mBottom; 6060 } 6061 6062 /** 6063 * True if this view has changed since the last time being drawn. 6064 * 6065 * @return The dirty state of this view. 6066 */ 6067 public boolean isDirty() { 6068 return (mPrivateFlags & DIRTY_MASK) != 0; 6069 } 6070 6071 /** 6072 * Sets the bottom position of this view relative to its parent. This method is meant to be 6073 * called by the layout system and should not generally be called otherwise, because the 6074 * property may be changed at any time by the layout. 6075 * 6076 * @param bottom The bottom of this view, in pixels. 6077 */ 6078 public final void setBottom(int bottom) { 6079 if (bottom != mBottom) { 6080 updateMatrix(); 6081 if (mMatrixIsIdentity) { 6082 final ViewParent p = mParent; 6083 if (p != null && mAttachInfo != null) { 6084 final Rect r = mAttachInfo.mTmpInvalRect; 6085 int maxBottom; 6086 if (bottom < mBottom) { 6087 maxBottom = mBottom; 6088 } else { 6089 maxBottom = bottom; 6090 } 6091 r.set(0, 0, mRight - mLeft, maxBottom - mTop); 6092 p.invalidateChild(this, r); 6093 } 6094 } else { 6095 // Double-invalidation is necessary to capture view's old and new areas 6096 invalidate(true); 6097 } 6098 6099 int width = mRight - mLeft; 6100 int oldHeight = mBottom - mTop; 6101 6102 mBottom = bottom; 6103 6104 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6105 6106 if (!mMatrixIsIdentity) { 6107 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6108 // A change in dimension means an auto-centered pivot point changes, too 6109 mMatrixDirty = true; 6110 } 6111 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6112 invalidate(true); 6113 } 6114 mBackgroundSizeChanged = true; 6115 invalidateParentIfNeeded(); 6116 } 6117 } 6118 6119 /** 6120 * Left position of this view relative to its parent. 6121 * 6122 * @return The left edge of this view, in pixels. 6123 */ 6124 @ViewDebug.CapturedViewProperty 6125 public final int getLeft() { 6126 return mLeft; 6127 } 6128 6129 /** 6130 * Sets the left position of this view relative to its parent. This method is meant to be called 6131 * by the layout system and should not generally be called otherwise, because the property 6132 * may be changed at any time by the layout. 6133 * 6134 * @param left The bottom of this view, in pixels. 6135 */ 6136 public final void setLeft(int left) { 6137 if (left != mLeft) { 6138 updateMatrix(); 6139 if (mMatrixIsIdentity) { 6140 final ViewParent p = mParent; 6141 if (p != null && mAttachInfo != null) { 6142 final Rect r = mAttachInfo.mTmpInvalRect; 6143 int minLeft; 6144 int xLoc; 6145 if (left < mLeft) { 6146 minLeft = left; 6147 xLoc = left - mLeft; 6148 } else { 6149 minLeft = mLeft; 6150 xLoc = 0; 6151 } 6152 r.set(xLoc, 0, mRight - minLeft, mBottom - mTop); 6153 p.invalidateChild(this, r); 6154 } 6155 } else { 6156 // Double-invalidation is necessary to capture view's old and new areas 6157 invalidate(true); 6158 } 6159 6160 int oldWidth = mRight - mLeft; 6161 int height = mBottom - mTop; 6162 6163 mLeft = left; 6164 6165 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6166 6167 if (!mMatrixIsIdentity) { 6168 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6169 // A change in dimension means an auto-centered pivot point changes, too 6170 mMatrixDirty = true; 6171 } 6172 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6173 invalidate(true); 6174 } 6175 mBackgroundSizeChanged = true; 6176 invalidateParentIfNeeded(); 6177 } 6178 } 6179 6180 /** 6181 * Right position of this view relative to its parent. 6182 * 6183 * @return The right edge of this view, in pixels. 6184 */ 6185 @ViewDebug.CapturedViewProperty 6186 public final int getRight() { 6187 return mRight; 6188 } 6189 6190 /** 6191 * Sets the right position of this view relative to its parent. This method is meant to be called 6192 * by the layout system and should not generally be called otherwise, because the property 6193 * may be changed at any time by the layout. 6194 * 6195 * @param right The bottom of this view, in pixels. 6196 */ 6197 public final void setRight(int right) { 6198 if (right != mRight) { 6199 updateMatrix(); 6200 if (mMatrixIsIdentity) { 6201 final ViewParent p = mParent; 6202 if (p != null && mAttachInfo != null) { 6203 final Rect r = mAttachInfo.mTmpInvalRect; 6204 int maxRight; 6205 if (right < mRight) { 6206 maxRight = mRight; 6207 } else { 6208 maxRight = right; 6209 } 6210 r.set(0, 0, maxRight - mLeft, mBottom - mTop); 6211 p.invalidateChild(this, r); 6212 } 6213 } else { 6214 // Double-invalidation is necessary to capture view's old and new areas 6215 invalidate(true); 6216 } 6217 6218 int oldWidth = mRight - mLeft; 6219 int height = mBottom - mTop; 6220 6221 mRight = right; 6222 6223 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6224 6225 if (!mMatrixIsIdentity) { 6226 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6227 // A change in dimension means an auto-centered pivot point changes, too 6228 mMatrixDirty = true; 6229 } 6230 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6231 invalidate(true); 6232 } 6233 mBackgroundSizeChanged = true; 6234 invalidateParentIfNeeded(); 6235 } 6236 } 6237 6238 /** 6239 * The visual x position of this view, in pixels. This is equivalent to the 6240 * {@link #setTranslationX(float) translationX} property plus the current 6241 * {@link #getLeft() left} property. 6242 * 6243 * @return The visual x position of this view, in pixels. 6244 */ 6245 public float getX() { 6246 return mLeft + mTranslationX; 6247 } 6248 6249 /** 6250 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 6251 * {@link #setTranslationX(float) translationX} property to be the difference between 6252 * the x value passed in and the current {@link #getLeft() left} property. 6253 * 6254 * @param x The visual x position of this view, in pixels. 6255 */ 6256 public void setX(float x) { 6257 setTranslationX(x - mLeft); 6258 } 6259 6260 /** 6261 * The visual y position of this view, in pixels. This is equivalent to the 6262 * {@link #setTranslationY(float) translationY} property plus the current 6263 * {@link #getTop() top} property. 6264 * 6265 * @return The visual y position of this view, in pixels. 6266 */ 6267 public float getY() { 6268 return mTop + mTranslationY; 6269 } 6270 6271 /** 6272 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 6273 * {@link #setTranslationY(float) translationY} property to be the difference between 6274 * the y value passed in and the current {@link #getTop() top} property. 6275 * 6276 * @param y The visual y position of this view, in pixels. 6277 */ 6278 public void setY(float y) { 6279 setTranslationY(y - mTop); 6280 } 6281 6282 6283 /** 6284 * The horizontal location of this view relative to its {@link #getLeft() left} position. 6285 * This position is post-layout, in addition to wherever the object's 6286 * layout placed it. 6287 * 6288 * @return The horizontal position of this view relative to its left position, in pixels. 6289 */ 6290 public float getTranslationX() { 6291 return mTranslationX; 6292 } 6293 6294 /** 6295 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 6296 * This effectively positions the object post-layout, in addition to wherever the object's 6297 * layout placed it. 6298 * 6299 * @param translationX The horizontal position of this view relative to its left position, 6300 * in pixels. 6301 * 6302 * @attr ref android.R.styleable#View_translationX 6303 */ 6304 public void setTranslationX(float translationX) { 6305 if (mTranslationX != translationX) { 6306 invalidateParentCaches(); 6307 // Double-invalidation is necessary to capture view's old and new areas 6308 invalidate(false); 6309 mTranslationX = translationX; 6310 mMatrixDirty = true; 6311 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6312 invalidate(false); 6313 } 6314 } 6315 6316 /** 6317 * The horizontal location of this view relative to its {@link #getTop() top} position. 6318 * This position is post-layout, in addition to wherever the object's 6319 * layout placed it. 6320 * 6321 * @return The vertical position of this view relative to its top position, 6322 * in pixels. 6323 */ 6324 public float getTranslationY() { 6325 return mTranslationY; 6326 } 6327 6328 /** 6329 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 6330 * This effectively positions the object post-layout, in addition to wherever the object's 6331 * layout placed it. 6332 * 6333 * @param translationY The vertical position of this view relative to its top position, 6334 * in pixels. 6335 * 6336 * @attr ref android.R.styleable#View_translationY 6337 */ 6338 public void setTranslationY(float translationY) { 6339 if (mTranslationY != translationY) { 6340 invalidateParentCaches(); 6341 // Double-invalidation is necessary to capture view's old and new areas 6342 invalidate(false); 6343 mTranslationY = translationY; 6344 mMatrixDirty = true; 6345 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6346 invalidate(false); 6347 } 6348 } 6349 6350 /** 6351 * Hit rectangle in parent's coordinates 6352 * 6353 * @param outRect The hit rectangle of the view. 6354 */ 6355 public void getHitRect(Rect outRect) { 6356 updateMatrix(); 6357 if (mMatrixIsIdentity || mAttachInfo == null) { 6358 outRect.set(mLeft, mTop, mRight, mBottom); 6359 } else { 6360 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 6361 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 6362 mMatrix.mapRect(tmpRect); 6363 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 6364 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 6365 } 6366 } 6367 6368 /** 6369 * Determines whether the given point, in local coordinates is inside the view. 6370 */ 6371 /*package*/ final boolean pointInView(float localX, float localY) { 6372 return localX >= 0 && localX < (mRight - mLeft) 6373 && localY >= 0 && localY < (mBottom - mTop); 6374 } 6375 6376 /** 6377 * Utility method to determine whether the given point, in local coordinates, 6378 * is inside the view, where the area of the view is expanded by the slop factor. 6379 * This method is called while processing touch-move events to determine if the event 6380 * is still within the view. 6381 */ 6382 private boolean pointInView(float localX, float localY, float slop) { 6383 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 6384 localY < ((mBottom - mTop) + slop); 6385 } 6386 6387 /** 6388 * When a view has focus and the user navigates away from it, the next view is searched for 6389 * starting from the rectangle filled in by this method. 6390 * 6391 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 6392 * view maintains some idea of internal selection, such as a cursor, or a selected row 6393 * or column, you should override this method and fill in a more specific rectangle. 6394 * 6395 * @param r The rectangle to fill in, in this view's coordinates. 6396 */ 6397 public void getFocusedRect(Rect r) { 6398 getDrawingRect(r); 6399 } 6400 6401 /** 6402 * If some part of this view is not clipped by any of its parents, then 6403 * return that area in r in global (root) coordinates. To convert r to local 6404 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 6405 * -globalOffset.y)) If the view is completely clipped or translated out, 6406 * return false. 6407 * 6408 * @param r If true is returned, r holds the global coordinates of the 6409 * visible portion of this view. 6410 * @param globalOffset If true is returned, globalOffset holds the dx,dy 6411 * between this view and its root. globalOffet may be null. 6412 * @return true if r is non-empty (i.e. part of the view is visible at the 6413 * root level. 6414 */ 6415 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 6416 int width = mRight - mLeft; 6417 int height = mBottom - mTop; 6418 if (width > 0 && height > 0) { 6419 r.set(0, 0, width, height); 6420 if (globalOffset != null) { 6421 globalOffset.set(-mScrollX, -mScrollY); 6422 } 6423 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 6424 } 6425 return false; 6426 } 6427 6428 public final boolean getGlobalVisibleRect(Rect r) { 6429 return getGlobalVisibleRect(r, null); 6430 } 6431 6432 public final boolean getLocalVisibleRect(Rect r) { 6433 Point offset = new Point(); 6434 if (getGlobalVisibleRect(r, offset)) { 6435 r.offset(-offset.x, -offset.y); // make r local 6436 return true; 6437 } 6438 return false; 6439 } 6440 6441 /** 6442 * Offset this view's vertical location by the specified number of pixels. 6443 * 6444 * @param offset the number of pixels to offset the view by 6445 */ 6446 public void offsetTopAndBottom(int offset) { 6447 if (offset != 0) { 6448 updateMatrix(); 6449 if (mMatrixIsIdentity) { 6450 final ViewParent p = mParent; 6451 if (p != null && mAttachInfo != null) { 6452 final Rect r = mAttachInfo.mTmpInvalRect; 6453 int minTop; 6454 int maxBottom; 6455 int yLoc; 6456 if (offset < 0) { 6457 minTop = mTop + offset; 6458 maxBottom = mBottom; 6459 yLoc = offset; 6460 } else { 6461 minTop = mTop; 6462 maxBottom = mBottom + offset; 6463 yLoc = 0; 6464 } 6465 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 6466 p.invalidateChild(this, r); 6467 } 6468 } else { 6469 invalidate(false); 6470 } 6471 6472 mTop += offset; 6473 mBottom += offset; 6474 6475 if (!mMatrixIsIdentity) { 6476 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6477 invalidate(false); 6478 } 6479 invalidateParentIfNeeded(); 6480 } 6481 } 6482 6483 /** 6484 * Offset this view's horizontal location by the specified amount of pixels. 6485 * 6486 * @param offset the numer of pixels to offset the view by 6487 */ 6488 public void offsetLeftAndRight(int offset) { 6489 if (offset != 0) { 6490 updateMatrix(); 6491 if (mMatrixIsIdentity) { 6492 final ViewParent p = mParent; 6493 if (p != null && mAttachInfo != null) { 6494 final Rect r = mAttachInfo.mTmpInvalRect; 6495 int minLeft; 6496 int maxRight; 6497 if (offset < 0) { 6498 minLeft = mLeft + offset; 6499 maxRight = mRight; 6500 } else { 6501 minLeft = mLeft; 6502 maxRight = mRight + offset; 6503 } 6504 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 6505 p.invalidateChild(this, r); 6506 } 6507 } else { 6508 invalidate(false); 6509 } 6510 6511 mLeft += offset; 6512 mRight += offset; 6513 6514 if (!mMatrixIsIdentity) { 6515 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6516 invalidate(false); 6517 } 6518 invalidateParentIfNeeded(); 6519 } 6520 } 6521 6522 /** 6523 * Get the LayoutParams associated with this view. All views should have 6524 * layout parameters. These supply parameters to the <i>parent</i> of this 6525 * view specifying how it should be arranged. There are many subclasses of 6526 * ViewGroup.LayoutParams, and these correspond to the different subclasses 6527 * of ViewGroup that are responsible for arranging their children. 6528 * @return The LayoutParams associated with this view 6529 */ 6530 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 6531 public ViewGroup.LayoutParams getLayoutParams() { 6532 return mLayoutParams; 6533 } 6534 6535 /** 6536 * Set the layout parameters associated with this view. These supply 6537 * parameters to the <i>parent</i> of this view specifying how it should be 6538 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 6539 * correspond to the different subclasses of ViewGroup that are responsible 6540 * for arranging their children. 6541 * 6542 * @param params the layout parameters for this view 6543 */ 6544 public void setLayoutParams(ViewGroup.LayoutParams params) { 6545 if (params == null) { 6546 throw new NullPointerException("params == null"); 6547 } 6548 mLayoutParams = params; 6549 requestLayout(); 6550 } 6551 6552 /** 6553 * Set the scrolled position of your view. This will cause a call to 6554 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6555 * invalidated. 6556 * @param x the x position to scroll to 6557 * @param y the y position to scroll to 6558 */ 6559 public void scrollTo(int x, int y) { 6560 if (mScrollX != x || mScrollY != y) { 6561 int oldX = mScrollX; 6562 int oldY = mScrollY; 6563 mScrollX = x; 6564 mScrollY = y; 6565 invalidateParentCaches(); 6566 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 6567 if (!awakenScrollBars()) { 6568 invalidate(true); 6569 } 6570 } 6571 } 6572 6573 /** 6574 * Move the scrolled position of your view. This will cause a call to 6575 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6576 * invalidated. 6577 * @param x the amount of pixels to scroll by horizontally 6578 * @param y the amount of pixels to scroll by vertically 6579 */ 6580 public void scrollBy(int x, int y) { 6581 scrollTo(mScrollX + x, mScrollY + y); 6582 } 6583 6584 /** 6585 * <p>Trigger the scrollbars to draw. When invoked this method starts an 6586 * animation to fade the scrollbars out after a default delay. If a subclass 6587 * provides animated scrolling, the start delay should equal the duration 6588 * of the scrolling animation.</p> 6589 * 6590 * <p>The animation starts only if at least one of the scrollbars is 6591 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 6592 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6593 * this method returns true, and false otherwise. If the animation is 6594 * started, this method calls {@link #invalidate()}; in that case the 6595 * caller should not call {@link #invalidate()}.</p> 6596 * 6597 * <p>This method should be invoked every time a subclass directly updates 6598 * the scroll parameters.</p> 6599 * 6600 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6601 * and {@link #scrollTo(int, int)}.</p> 6602 * 6603 * @return true if the animation is played, false otherwise 6604 * 6605 * @see #awakenScrollBars(int) 6606 * @see #scrollBy(int, int) 6607 * @see #scrollTo(int, int) 6608 * @see #isHorizontalScrollBarEnabled() 6609 * @see #isVerticalScrollBarEnabled() 6610 * @see #setHorizontalScrollBarEnabled(boolean) 6611 * @see #setVerticalScrollBarEnabled(boolean) 6612 */ 6613 protected boolean awakenScrollBars() { 6614 return mScrollCache != null && 6615 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6616 } 6617 6618 /** 6619 * Trigger the scrollbars to draw. 6620 * This method differs from awakenScrollBars() only in its default duration. 6621 * initialAwakenScrollBars() will show the scroll bars for longer than 6622 * usual to give the user more of a chance to notice them. 6623 * 6624 * @return true if the animation is played, false otherwise. 6625 */ 6626 private boolean initialAwakenScrollBars() { 6627 return mScrollCache != null && 6628 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6629 } 6630 6631 /** 6632 * <p> 6633 * Trigger the scrollbars to draw. When invoked this method starts an 6634 * animation to fade the scrollbars out after a fixed delay. If a subclass 6635 * provides animated scrolling, the start delay should equal the duration of 6636 * the scrolling animation. 6637 * </p> 6638 * 6639 * <p> 6640 * The animation starts only if at least one of the scrollbars is enabled, 6641 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6642 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6643 * this method returns true, and false otherwise. If the animation is 6644 * started, this method calls {@link #invalidate()}; in that case the caller 6645 * should not call {@link #invalidate()}. 6646 * </p> 6647 * 6648 * <p> 6649 * This method should be invoked everytime a subclass directly updates the 6650 * scroll parameters. 6651 * </p> 6652 * 6653 * @param startDelay the delay, in milliseconds, after which the animation 6654 * should start; when the delay is 0, the animation starts 6655 * immediately 6656 * @return true if the animation is played, false otherwise 6657 * 6658 * @see #scrollBy(int, int) 6659 * @see #scrollTo(int, int) 6660 * @see #isHorizontalScrollBarEnabled() 6661 * @see #isVerticalScrollBarEnabled() 6662 * @see #setHorizontalScrollBarEnabled(boolean) 6663 * @see #setVerticalScrollBarEnabled(boolean) 6664 */ 6665 protected boolean awakenScrollBars(int startDelay) { 6666 return awakenScrollBars(startDelay, true); 6667 } 6668 6669 /** 6670 * <p> 6671 * Trigger the scrollbars to draw. When invoked this method starts an 6672 * animation to fade the scrollbars out after a fixed delay. If a subclass 6673 * provides animated scrolling, the start delay should equal the duration of 6674 * the scrolling animation. 6675 * </p> 6676 * 6677 * <p> 6678 * The animation starts only if at least one of the scrollbars is enabled, 6679 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6680 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6681 * this method returns true, and false otherwise. If the animation is 6682 * started, this method calls {@link #invalidate()} if the invalidate parameter 6683 * is set to true; in that case the caller 6684 * should not call {@link #invalidate()}. 6685 * </p> 6686 * 6687 * <p> 6688 * This method should be invoked everytime a subclass directly updates the 6689 * scroll parameters. 6690 * </p> 6691 * 6692 * @param startDelay the delay, in milliseconds, after which the animation 6693 * should start; when the delay is 0, the animation starts 6694 * immediately 6695 * 6696 * @param invalidate Wheter this method should call invalidate 6697 * 6698 * @return true if the animation is played, false otherwise 6699 * 6700 * @see #scrollBy(int, int) 6701 * @see #scrollTo(int, int) 6702 * @see #isHorizontalScrollBarEnabled() 6703 * @see #isVerticalScrollBarEnabled() 6704 * @see #setHorizontalScrollBarEnabled(boolean) 6705 * @see #setVerticalScrollBarEnabled(boolean) 6706 */ 6707 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 6708 final ScrollabilityCache scrollCache = mScrollCache; 6709 6710 if (scrollCache == null || !scrollCache.fadeScrollBars) { 6711 return false; 6712 } 6713 6714 if (scrollCache.scrollBar == null) { 6715 scrollCache.scrollBar = new ScrollBarDrawable(); 6716 } 6717 6718 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 6719 6720 if (invalidate) { 6721 // Invalidate to show the scrollbars 6722 invalidate(true); 6723 } 6724 6725 if (scrollCache.state == ScrollabilityCache.OFF) { 6726 // FIXME: this is copied from WindowManagerService. 6727 // We should get this value from the system when it 6728 // is possible to do so. 6729 final int KEY_REPEAT_FIRST_DELAY = 750; 6730 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 6731 } 6732 6733 // Tell mScrollCache when we should start fading. This may 6734 // extend the fade start time if one was already scheduled 6735 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 6736 scrollCache.fadeStartTime = fadeStartTime; 6737 scrollCache.state = ScrollabilityCache.ON; 6738 6739 // Schedule our fader to run, unscheduling any old ones first 6740 if (mAttachInfo != null) { 6741 mAttachInfo.mHandler.removeCallbacks(scrollCache); 6742 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 6743 } 6744 6745 return true; 6746 } 6747 6748 return false; 6749 } 6750 6751 /** 6752 * Mark the the area defined by dirty as needing to be drawn. If the view is 6753 * visible, {@link #onDraw} will be called at some point in the future. 6754 * This must be called from a UI thread. To call from a non-UI thread, call 6755 * {@link #postInvalidate()}. 6756 * 6757 * WARNING: This method is destructive to dirty. 6758 * @param dirty the rectangle representing the bounds of the dirty region 6759 */ 6760 public void invalidate(Rect dirty) { 6761 if (ViewDebug.TRACE_HIERARCHY) { 6762 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6763 } 6764 6765 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6766 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 6767 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 6768 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6769 mPrivateFlags |= INVALIDATED; 6770 final ViewParent p = mParent; 6771 final AttachInfo ai = mAttachInfo; 6772 //noinspection PointlessBooleanExpression,ConstantConditions 6773 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 6774 if (p != null && ai != null && ai.mHardwareAccelerated) { 6775 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6776 // with a null dirty rect, which tells the ViewRoot to redraw everything 6777 p.invalidateChild(this, null); 6778 return; 6779 } 6780 } 6781 if (p != null && ai != null) { 6782 final int scrollX = mScrollX; 6783 final int scrollY = mScrollY; 6784 final Rect r = ai.mTmpInvalRect; 6785 r.set(dirty.left - scrollX, dirty.top - scrollY, 6786 dirty.right - scrollX, dirty.bottom - scrollY); 6787 mParent.invalidateChild(this, r); 6788 } 6789 } 6790 } 6791 6792 /** 6793 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 6794 * The coordinates of the dirty rect are relative to the view. 6795 * If the view is visible, {@link #onDraw} will be called at some point 6796 * in the future. This must be called from a UI thread. To call 6797 * from a non-UI thread, call {@link #postInvalidate()}. 6798 * @param l the left position of the dirty region 6799 * @param t the top position of the dirty region 6800 * @param r the right position of the dirty region 6801 * @param b the bottom position of the dirty region 6802 */ 6803 public void invalidate(int l, int t, int r, int b) { 6804 if (ViewDebug.TRACE_HIERARCHY) { 6805 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6806 } 6807 6808 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6809 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 6810 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 6811 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6812 mPrivateFlags |= INVALIDATED; 6813 final ViewParent p = mParent; 6814 final AttachInfo ai = mAttachInfo; 6815 //noinspection PointlessBooleanExpression,ConstantConditions 6816 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 6817 if (p != null && ai != null && ai.mHardwareAccelerated) { 6818 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6819 // with a null dirty rect, which tells the ViewRoot to redraw everything 6820 p.invalidateChild(this, null); 6821 return; 6822 } 6823 } 6824 if (p != null && ai != null && l < r && t < b) { 6825 final int scrollX = mScrollX; 6826 final int scrollY = mScrollY; 6827 final Rect tmpr = ai.mTmpInvalRect; 6828 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 6829 p.invalidateChild(this, tmpr); 6830 } 6831 } 6832 } 6833 6834 /** 6835 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 6836 * be called at some point in the future. This must be called from a 6837 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 6838 */ 6839 public void invalidate() { 6840 invalidate(true); 6841 } 6842 6843 /** 6844 * This is where the invalidate() work actually happens. A full invalidate() 6845 * causes the drawing cache to be invalidated, but this function can be called with 6846 * invalidateCache set to false to skip that invalidation step for cases that do not 6847 * need it (for example, a component that remains at the same dimensions with the same 6848 * content). 6849 * 6850 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 6851 * well. This is usually true for a full invalidate, but may be set to false if the 6852 * View's contents or dimensions have not changed. 6853 */ 6854 private void invalidate(boolean invalidateCache) { 6855 if (ViewDebug.TRACE_HIERARCHY) { 6856 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6857 } 6858 6859 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6860 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 6861 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 6862 mLastIsOpaque = isOpaque(); 6863 mPrivateFlags &= ~DRAWN; 6864 if (invalidateCache) { 6865 mPrivateFlags |= INVALIDATED; 6866 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6867 } 6868 final AttachInfo ai = mAttachInfo; 6869 final ViewParent p = mParent; 6870 //noinspection PointlessBooleanExpression,ConstantConditions 6871 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 6872 if (p != null && ai != null && ai.mHardwareAccelerated) { 6873 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6874 // with a null dirty rect, which tells the ViewRoot to redraw everything 6875 p.invalidateChild(this, null); 6876 return; 6877 } 6878 } 6879 6880 if (p != null && ai != null) { 6881 final Rect r = ai.mTmpInvalRect; 6882 r.set(0, 0, mRight - mLeft, mBottom - mTop); 6883 // Don't call invalidate -- we don't want to internally scroll 6884 // our own bounds 6885 p.invalidateChild(this, r); 6886 } 6887 } 6888 } 6889 6890 /** 6891 * Used to indicate that the parent of this view should clear its caches. This functionality 6892 * is used to force the parent to rebuild its display list (when hardware-accelerated), 6893 * which is necessary when various parent-managed properties of the view change, such as 6894 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 6895 * clears the parent caches and does not causes an invalidate event. 6896 * 6897 * @hide 6898 */ 6899 protected void invalidateParentCaches() { 6900 if (mParent instanceof View) { 6901 ((View) mParent).mPrivateFlags |= INVALIDATED; 6902 } 6903 } 6904 6905 /** 6906 * Used to indicate that the parent of this view should be invalidated. This functionality 6907 * is used to force the parent to rebuild its display list (when hardware-accelerated), 6908 * which is necessary when various parent-managed properties of the view change, such as 6909 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 6910 * an invalidation event to the parent. 6911 * 6912 * @hide 6913 */ 6914 protected void invalidateParentIfNeeded() { 6915 if (isHardwareAccelerated() && mParent instanceof View) { 6916 ((View) mParent).invalidate(true); 6917 } 6918 } 6919 6920 /** 6921 * Indicates whether this View is opaque. An opaque View guarantees that it will 6922 * draw all the pixels overlapping its bounds using a fully opaque color. 6923 * 6924 * Subclasses of View should override this method whenever possible to indicate 6925 * whether an instance is opaque. Opaque Views are treated in a special way by 6926 * the View hierarchy, possibly allowing it to perform optimizations during 6927 * invalidate/draw passes. 6928 * 6929 * @return True if this View is guaranteed to be fully opaque, false otherwise. 6930 */ 6931 @ViewDebug.ExportedProperty(category = "drawing") 6932 public boolean isOpaque() { 6933 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 6934 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 6935 } 6936 6937 /** 6938 * @hide 6939 */ 6940 protected void computeOpaqueFlags() { 6941 // Opaque if: 6942 // - Has a background 6943 // - Background is opaque 6944 // - Doesn't have scrollbars or scrollbars are inside overlay 6945 6946 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 6947 mPrivateFlags |= OPAQUE_BACKGROUND; 6948 } else { 6949 mPrivateFlags &= ~OPAQUE_BACKGROUND; 6950 } 6951 6952 final int flags = mViewFlags; 6953 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 6954 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 6955 mPrivateFlags |= OPAQUE_SCROLLBARS; 6956 } else { 6957 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 6958 } 6959 } 6960 6961 /** 6962 * @hide 6963 */ 6964 protected boolean hasOpaqueScrollbars() { 6965 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 6966 } 6967 6968 /** 6969 * @return A handler associated with the thread running the View. This 6970 * handler can be used to pump events in the UI events queue. 6971 */ 6972 public Handler getHandler() { 6973 if (mAttachInfo != null) { 6974 return mAttachInfo.mHandler; 6975 } 6976 return null; 6977 } 6978 6979 /** 6980 * Causes the Runnable to be added to the message queue. 6981 * The runnable will be run on the user interface thread. 6982 * 6983 * @param action The Runnable that will be executed. 6984 * 6985 * @return Returns true if the Runnable was successfully placed in to the 6986 * message queue. Returns false on failure, usually because the 6987 * looper processing the message queue is exiting. 6988 */ 6989 public boolean post(Runnable action) { 6990 Handler handler; 6991 if (mAttachInfo != null) { 6992 handler = mAttachInfo.mHandler; 6993 } else { 6994 // Assume that post will succeed later 6995 ViewRoot.getRunQueue().post(action); 6996 return true; 6997 } 6998 6999 return handler.post(action); 7000 } 7001 7002 /** 7003 * Causes the Runnable to be added to the message queue, to be run 7004 * after the specified amount of time elapses. 7005 * The runnable will be run on the user interface thread. 7006 * 7007 * @param action The Runnable that will be executed. 7008 * @param delayMillis The delay (in milliseconds) until the Runnable 7009 * will be executed. 7010 * 7011 * @return true if the Runnable was successfully placed in to the 7012 * message queue. Returns false on failure, usually because the 7013 * looper processing the message queue is exiting. Note that a 7014 * result of true does not mean the Runnable will be processed -- 7015 * if the looper is quit before the delivery time of the message 7016 * occurs then the message will be dropped. 7017 */ 7018 public boolean postDelayed(Runnable action, long delayMillis) { 7019 Handler handler; 7020 if (mAttachInfo != null) { 7021 handler = mAttachInfo.mHandler; 7022 } else { 7023 // Assume that post will succeed later 7024 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 7025 return true; 7026 } 7027 7028 return handler.postDelayed(action, delayMillis); 7029 } 7030 7031 /** 7032 * Removes the specified Runnable from the message queue. 7033 * 7034 * @param action The Runnable to remove from the message handling queue 7035 * 7036 * @return true if this view could ask the Handler to remove the Runnable, 7037 * false otherwise. When the returned value is true, the Runnable 7038 * may or may not have been actually removed from the message queue 7039 * (for instance, if the Runnable was not in the queue already.) 7040 */ 7041 public boolean removeCallbacks(Runnable action) { 7042 Handler handler; 7043 if (mAttachInfo != null) { 7044 handler = mAttachInfo.mHandler; 7045 } else { 7046 // Assume that post will succeed later 7047 ViewRoot.getRunQueue().removeCallbacks(action); 7048 return true; 7049 } 7050 7051 handler.removeCallbacks(action); 7052 return true; 7053 } 7054 7055 /** 7056 * Cause an invalidate to happen on a subsequent cycle through the event loop. 7057 * Use this to invalidate the View from a non-UI thread. 7058 * 7059 * @see #invalidate() 7060 */ 7061 public void postInvalidate() { 7062 postInvalidateDelayed(0); 7063 } 7064 7065 /** 7066 * Cause an invalidate of the specified area to happen on a subsequent cycle 7067 * through the event loop. Use this to invalidate the View from a non-UI thread. 7068 * 7069 * @param left The left coordinate of the rectangle to invalidate. 7070 * @param top The top coordinate of the rectangle to invalidate. 7071 * @param right The right coordinate of the rectangle to invalidate. 7072 * @param bottom The bottom coordinate of the rectangle to invalidate. 7073 * 7074 * @see #invalidate(int, int, int, int) 7075 * @see #invalidate(Rect) 7076 */ 7077 public void postInvalidate(int left, int top, int right, int bottom) { 7078 postInvalidateDelayed(0, left, top, right, bottom); 7079 } 7080 7081 /** 7082 * Cause an invalidate to happen on a subsequent cycle through the event 7083 * loop. Waits for the specified amount of time. 7084 * 7085 * @param delayMilliseconds the duration in milliseconds to delay the 7086 * invalidation by 7087 */ 7088 public void postInvalidateDelayed(long delayMilliseconds) { 7089 // We try only with the AttachInfo because there's no point in invalidating 7090 // if we are not attached to our window 7091 if (mAttachInfo != null) { 7092 Message msg = Message.obtain(); 7093 msg.what = AttachInfo.INVALIDATE_MSG; 7094 msg.obj = this; 7095 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 7096 } 7097 } 7098 7099 /** 7100 * Cause an invalidate of the specified area to happen on a subsequent cycle 7101 * through the event loop. Waits for the specified amount of time. 7102 * 7103 * @param delayMilliseconds the duration in milliseconds to delay the 7104 * invalidation by 7105 * @param left The left coordinate of the rectangle to invalidate. 7106 * @param top The top coordinate of the rectangle to invalidate. 7107 * @param right The right coordinate of the rectangle to invalidate. 7108 * @param bottom The bottom coordinate of the rectangle to invalidate. 7109 */ 7110 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 7111 int right, int bottom) { 7112 7113 // We try only with the AttachInfo because there's no point in invalidating 7114 // if we are not attached to our window 7115 if (mAttachInfo != null) { 7116 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 7117 info.target = this; 7118 info.left = left; 7119 info.top = top; 7120 info.right = right; 7121 info.bottom = bottom; 7122 7123 final Message msg = Message.obtain(); 7124 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 7125 msg.obj = info; 7126 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 7127 } 7128 } 7129 7130 /** 7131 * Called by a parent to request that a child update its values for mScrollX 7132 * and mScrollY if necessary. This will typically be done if the child is 7133 * animating a scroll using a {@link android.widget.Scroller Scroller} 7134 * object. 7135 */ 7136 public void computeScroll() { 7137 } 7138 7139 /** 7140 * <p>Indicate whether the horizontal edges are faded when the view is 7141 * scrolled horizontally.</p> 7142 * 7143 * @return true if the horizontal edges should are faded on scroll, false 7144 * otherwise 7145 * 7146 * @see #setHorizontalFadingEdgeEnabled(boolean) 7147 * @attr ref android.R.styleable#View_fadingEdge 7148 */ 7149 public boolean isHorizontalFadingEdgeEnabled() { 7150 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 7151 } 7152 7153 /** 7154 * <p>Define whether the horizontal edges should be faded when this view 7155 * is scrolled horizontally.</p> 7156 * 7157 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 7158 * be faded when the view is scrolled 7159 * horizontally 7160 * 7161 * @see #isHorizontalFadingEdgeEnabled() 7162 * @attr ref android.R.styleable#View_fadingEdge 7163 */ 7164 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 7165 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 7166 if (horizontalFadingEdgeEnabled) { 7167 initScrollCache(); 7168 } 7169 7170 mViewFlags ^= FADING_EDGE_HORIZONTAL; 7171 } 7172 } 7173 7174 /** 7175 * <p>Indicate whether the vertical edges are faded when the view is 7176 * scrolled horizontally.</p> 7177 * 7178 * @return true if the vertical edges should are faded on scroll, false 7179 * otherwise 7180 * 7181 * @see #setVerticalFadingEdgeEnabled(boolean) 7182 * @attr ref android.R.styleable#View_fadingEdge 7183 */ 7184 public boolean isVerticalFadingEdgeEnabled() { 7185 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 7186 } 7187 7188 /** 7189 * <p>Define whether the vertical edges should be faded when this view 7190 * is scrolled vertically.</p> 7191 * 7192 * @param verticalFadingEdgeEnabled true if the vertical edges should 7193 * be faded when the view is scrolled 7194 * vertically 7195 * 7196 * @see #isVerticalFadingEdgeEnabled() 7197 * @attr ref android.R.styleable#View_fadingEdge 7198 */ 7199 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 7200 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 7201 if (verticalFadingEdgeEnabled) { 7202 initScrollCache(); 7203 } 7204 7205 mViewFlags ^= FADING_EDGE_VERTICAL; 7206 } 7207 } 7208 7209 /** 7210 * Returns the strength, or intensity, of the top faded edge. The strength is 7211 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7212 * returns 0.0 or 1.0 but no value in between. 7213 * 7214 * Subclasses should override this method to provide a smoother fade transition 7215 * when scrolling occurs. 7216 * 7217 * @return the intensity of the top fade as a float between 0.0f and 1.0f 7218 */ 7219 protected float getTopFadingEdgeStrength() { 7220 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 7221 } 7222 7223 /** 7224 * Returns the strength, or intensity, of the bottom faded edge. The strength is 7225 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7226 * returns 0.0 or 1.0 but no value in between. 7227 * 7228 * Subclasses should override this method to provide a smoother fade transition 7229 * when scrolling occurs. 7230 * 7231 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 7232 */ 7233 protected float getBottomFadingEdgeStrength() { 7234 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 7235 computeVerticalScrollRange() ? 1.0f : 0.0f; 7236 } 7237 7238 /** 7239 * Returns the strength, or intensity, of the left faded edge. The strength is 7240 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7241 * returns 0.0 or 1.0 but no value in between. 7242 * 7243 * Subclasses should override this method to provide a smoother fade transition 7244 * when scrolling occurs. 7245 * 7246 * @return the intensity of the left fade as a float between 0.0f and 1.0f 7247 */ 7248 protected float getLeftFadingEdgeStrength() { 7249 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 7250 } 7251 7252 /** 7253 * Returns the strength, or intensity, of the right faded edge. The strength is 7254 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7255 * returns 0.0 or 1.0 but no value in between. 7256 * 7257 * Subclasses should override this method to provide a smoother fade transition 7258 * when scrolling occurs. 7259 * 7260 * @return the intensity of the right fade as a float between 0.0f and 1.0f 7261 */ 7262 protected float getRightFadingEdgeStrength() { 7263 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 7264 computeHorizontalScrollRange() ? 1.0f : 0.0f; 7265 } 7266 7267 /** 7268 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 7269 * scrollbar is not drawn by default.</p> 7270 * 7271 * @return true if the horizontal scrollbar should be painted, false 7272 * otherwise 7273 * 7274 * @see #setHorizontalScrollBarEnabled(boolean) 7275 */ 7276 public boolean isHorizontalScrollBarEnabled() { 7277 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7278 } 7279 7280 /** 7281 * <p>Define whether the horizontal scrollbar should be drawn or not. The 7282 * scrollbar is not drawn by default.</p> 7283 * 7284 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 7285 * be painted 7286 * 7287 * @see #isHorizontalScrollBarEnabled() 7288 */ 7289 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 7290 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 7291 mViewFlags ^= SCROLLBARS_HORIZONTAL; 7292 computeOpaqueFlags(); 7293 recomputePadding(); 7294 } 7295 } 7296 7297 /** 7298 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 7299 * scrollbar is not drawn by default.</p> 7300 * 7301 * @return true if the vertical scrollbar should be painted, false 7302 * otherwise 7303 * 7304 * @see #setVerticalScrollBarEnabled(boolean) 7305 */ 7306 public boolean isVerticalScrollBarEnabled() { 7307 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 7308 } 7309 7310 /** 7311 * <p>Define whether the vertical scrollbar should be drawn or not. The 7312 * scrollbar is not drawn by default.</p> 7313 * 7314 * @param verticalScrollBarEnabled true if the vertical scrollbar should 7315 * be painted 7316 * 7317 * @see #isVerticalScrollBarEnabled() 7318 */ 7319 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 7320 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 7321 mViewFlags ^= SCROLLBARS_VERTICAL; 7322 computeOpaqueFlags(); 7323 recomputePadding(); 7324 } 7325 } 7326 7327 /** 7328 * @hide 7329 */ 7330 protected void recomputePadding() { 7331 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 7332 } 7333 7334 /** 7335 * Define whether scrollbars will fade when the view is not scrolling. 7336 * 7337 * @param fadeScrollbars wheter to enable fading 7338 * 7339 */ 7340 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 7341 initScrollCache(); 7342 final ScrollabilityCache scrollabilityCache = mScrollCache; 7343 scrollabilityCache.fadeScrollBars = fadeScrollbars; 7344 if (fadeScrollbars) { 7345 scrollabilityCache.state = ScrollabilityCache.OFF; 7346 } else { 7347 scrollabilityCache.state = ScrollabilityCache.ON; 7348 } 7349 } 7350 7351 /** 7352 * 7353 * Returns true if scrollbars will fade when this view is not scrolling 7354 * 7355 * @return true if scrollbar fading is enabled 7356 */ 7357 public boolean isScrollbarFadingEnabled() { 7358 return mScrollCache != null && mScrollCache.fadeScrollBars; 7359 } 7360 7361 /** 7362 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 7363 * inset. When inset, they add to the padding of the view. And the scrollbars 7364 * can be drawn inside the padding area or on the edge of the view. For example, 7365 * if a view has a background drawable and you want to draw the scrollbars 7366 * inside the padding specified by the drawable, you can use 7367 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 7368 * appear at the edge of the view, ignoring the padding, then you can use 7369 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 7370 * @param style the style of the scrollbars. Should be one of 7371 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 7372 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 7373 * @see #SCROLLBARS_INSIDE_OVERLAY 7374 * @see #SCROLLBARS_INSIDE_INSET 7375 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7376 * @see #SCROLLBARS_OUTSIDE_INSET 7377 */ 7378 public void setScrollBarStyle(int style) { 7379 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 7380 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 7381 computeOpaqueFlags(); 7382 recomputePadding(); 7383 } 7384 } 7385 7386 /** 7387 * <p>Returns the current scrollbar style.</p> 7388 * @return the current scrollbar style 7389 * @see #SCROLLBARS_INSIDE_OVERLAY 7390 * @see #SCROLLBARS_INSIDE_INSET 7391 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7392 * @see #SCROLLBARS_OUTSIDE_INSET 7393 */ 7394 public int getScrollBarStyle() { 7395 return mViewFlags & SCROLLBARS_STYLE_MASK; 7396 } 7397 7398 /** 7399 * <p>Compute the horizontal range that the horizontal scrollbar 7400 * represents.</p> 7401 * 7402 * <p>The range is expressed in arbitrary units that must be the same as the 7403 * units used by {@link #computeHorizontalScrollExtent()} and 7404 * {@link #computeHorizontalScrollOffset()}.</p> 7405 * 7406 * <p>The default range is the drawing width of this view.</p> 7407 * 7408 * @return the total horizontal range represented by the horizontal 7409 * scrollbar 7410 * 7411 * @see #computeHorizontalScrollExtent() 7412 * @see #computeHorizontalScrollOffset() 7413 * @see android.widget.ScrollBarDrawable 7414 */ 7415 protected int computeHorizontalScrollRange() { 7416 return getWidth(); 7417 } 7418 7419 /** 7420 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 7421 * within the horizontal range. This value is used to compute the position 7422 * of the thumb within the scrollbar's track.</p> 7423 * 7424 * <p>The range is expressed in arbitrary units that must be the same as the 7425 * units used by {@link #computeHorizontalScrollRange()} and 7426 * {@link #computeHorizontalScrollExtent()}.</p> 7427 * 7428 * <p>The default offset is the scroll offset of this view.</p> 7429 * 7430 * @return the horizontal offset of the scrollbar's thumb 7431 * 7432 * @see #computeHorizontalScrollRange() 7433 * @see #computeHorizontalScrollExtent() 7434 * @see android.widget.ScrollBarDrawable 7435 */ 7436 protected int computeHorizontalScrollOffset() { 7437 return mScrollX; 7438 } 7439 7440 /** 7441 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 7442 * within the horizontal range. This value is used to compute the length 7443 * of the thumb within the scrollbar's track.</p> 7444 * 7445 * <p>The range is expressed in arbitrary units that must be the same as the 7446 * units used by {@link #computeHorizontalScrollRange()} and 7447 * {@link #computeHorizontalScrollOffset()}.</p> 7448 * 7449 * <p>The default extent is the drawing width of this view.</p> 7450 * 7451 * @return the horizontal extent of the scrollbar's thumb 7452 * 7453 * @see #computeHorizontalScrollRange() 7454 * @see #computeHorizontalScrollOffset() 7455 * @see android.widget.ScrollBarDrawable 7456 */ 7457 protected int computeHorizontalScrollExtent() { 7458 return getWidth(); 7459 } 7460 7461 /** 7462 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 7463 * 7464 * <p>The range is expressed in arbitrary units that must be the same as the 7465 * units used by {@link #computeVerticalScrollExtent()} and 7466 * {@link #computeVerticalScrollOffset()}.</p> 7467 * 7468 * @return the total vertical range represented by the vertical scrollbar 7469 * 7470 * <p>The default range is the drawing height of this view.</p> 7471 * 7472 * @see #computeVerticalScrollExtent() 7473 * @see #computeVerticalScrollOffset() 7474 * @see android.widget.ScrollBarDrawable 7475 */ 7476 protected int computeVerticalScrollRange() { 7477 return getHeight(); 7478 } 7479 7480 /** 7481 * <p>Compute the vertical offset of the vertical scrollbar's thumb 7482 * within the horizontal range. This value is used to compute the position 7483 * of the thumb within the scrollbar's track.</p> 7484 * 7485 * <p>The range is expressed in arbitrary units that must be the same as the 7486 * units used by {@link #computeVerticalScrollRange()} and 7487 * {@link #computeVerticalScrollExtent()}.</p> 7488 * 7489 * <p>The default offset is the scroll offset of this view.</p> 7490 * 7491 * @return the vertical offset of the scrollbar's thumb 7492 * 7493 * @see #computeVerticalScrollRange() 7494 * @see #computeVerticalScrollExtent() 7495 * @see android.widget.ScrollBarDrawable 7496 */ 7497 protected int computeVerticalScrollOffset() { 7498 return mScrollY; 7499 } 7500 7501 /** 7502 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 7503 * within the vertical range. This value is used to compute the length 7504 * of the thumb within the scrollbar's track.</p> 7505 * 7506 * <p>The range is expressed in arbitrary units that must be the same as the 7507 * units used by {@link #computeVerticalScrollRange()} and 7508 * {@link #computeVerticalScrollOffset()}.</p> 7509 * 7510 * <p>The default extent is the drawing height of this view.</p> 7511 * 7512 * @return the vertical extent of the scrollbar's thumb 7513 * 7514 * @see #computeVerticalScrollRange() 7515 * @see #computeVerticalScrollOffset() 7516 * @see android.widget.ScrollBarDrawable 7517 */ 7518 protected int computeVerticalScrollExtent() { 7519 return getHeight(); 7520 } 7521 7522 /** 7523 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 7524 * scrollbars are painted only if they have been awakened first.</p> 7525 * 7526 * @param canvas the canvas on which to draw the scrollbars 7527 * 7528 * @see #awakenScrollBars(int) 7529 */ 7530 protected final void onDrawScrollBars(Canvas canvas) { 7531 // scrollbars are drawn only when the animation is running 7532 final ScrollabilityCache cache = mScrollCache; 7533 if (cache != null) { 7534 7535 int state = cache.state; 7536 7537 if (state == ScrollabilityCache.OFF) { 7538 return; 7539 } 7540 7541 boolean invalidate = false; 7542 7543 if (state == ScrollabilityCache.FADING) { 7544 // We're fading -- get our fade interpolation 7545 if (cache.interpolatorValues == null) { 7546 cache.interpolatorValues = new float[1]; 7547 } 7548 7549 float[] values = cache.interpolatorValues; 7550 7551 // Stops the animation if we're done 7552 if (cache.scrollBarInterpolator.timeToValues(values) == 7553 Interpolator.Result.FREEZE_END) { 7554 cache.state = ScrollabilityCache.OFF; 7555 } else { 7556 cache.scrollBar.setAlpha(Math.round(values[0])); 7557 } 7558 7559 // This will make the scroll bars inval themselves after 7560 // drawing. We only want this when we're fading so that 7561 // we prevent excessive redraws 7562 invalidate = true; 7563 } else { 7564 // We're just on -- but we may have been fading before so 7565 // reset alpha 7566 cache.scrollBar.setAlpha(255); 7567 } 7568 7569 7570 final int viewFlags = mViewFlags; 7571 7572 final boolean drawHorizontalScrollBar = 7573 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7574 final boolean drawVerticalScrollBar = 7575 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 7576 && !isVerticalScrollBarHidden(); 7577 7578 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 7579 final int width = mRight - mLeft; 7580 final int height = mBottom - mTop; 7581 7582 final ScrollBarDrawable scrollBar = cache.scrollBar; 7583 int size = scrollBar.getSize(false); 7584 if (size <= 0) { 7585 size = cache.scrollBarSize; 7586 } 7587 7588 final int scrollX = mScrollX; 7589 final int scrollY = mScrollY; 7590 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 7591 7592 int left, top, right, bottom; 7593 7594 if (drawHorizontalScrollBar) { 7595 scrollBar.setParameters(computeHorizontalScrollRange(), 7596 computeHorizontalScrollOffset(), 7597 computeHorizontalScrollExtent(), false); 7598 final int verticalScrollBarGap = drawVerticalScrollBar ? 7599 getVerticalScrollbarWidth() : 0; 7600 top = scrollY + height - size - (mUserPaddingBottom & inside); 7601 left = scrollX + (mPaddingLeft & inside); 7602 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 7603 bottom = top + size; 7604 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 7605 if (invalidate) { 7606 invalidate(left, top, right, bottom); 7607 } 7608 } 7609 7610 if (drawVerticalScrollBar) { 7611 scrollBar.setParameters(computeVerticalScrollRange(), 7612 computeVerticalScrollOffset(), 7613 computeVerticalScrollExtent(), true); 7614 switch (mVerticalScrollbarPosition) { 7615 default: 7616 case SCROLLBAR_POSITION_DEFAULT: 7617 case SCROLLBAR_POSITION_RIGHT: 7618 left = scrollX + width - size - (mUserPaddingRight & inside); 7619 break; 7620 case SCROLLBAR_POSITION_LEFT: 7621 left = scrollX + (mUserPaddingLeft & inside); 7622 break; 7623 } 7624 top = scrollY + (mPaddingTop & inside); 7625 right = left + size; 7626 bottom = scrollY + height - (mUserPaddingBottom & inside); 7627 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 7628 if (invalidate) { 7629 invalidate(left, top, right, bottom); 7630 } 7631 } 7632 } 7633 } 7634 } 7635 7636 /** 7637 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 7638 * FastScroller is visible. 7639 * @return whether to temporarily hide the vertical scrollbar 7640 * @hide 7641 */ 7642 protected boolean isVerticalScrollBarHidden() { 7643 return false; 7644 } 7645 7646 /** 7647 * <p>Draw the horizontal scrollbar if 7648 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 7649 * 7650 * @param canvas the canvas on which to draw the scrollbar 7651 * @param scrollBar the scrollbar's drawable 7652 * 7653 * @see #isHorizontalScrollBarEnabled() 7654 * @see #computeHorizontalScrollRange() 7655 * @see #computeHorizontalScrollExtent() 7656 * @see #computeHorizontalScrollOffset() 7657 * @see android.widget.ScrollBarDrawable 7658 * @hide 7659 */ 7660 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 7661 int l, int t, int r, int b) { 7662 scrollBar.setBounds(l, t, r, b); 7663 scrollBar.draw(canvas); 7664 } 7665 7666 /** 7667 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 7668 * returns true.</p> 7669 * 7670 * @param canvas the canvas on which to draw the scrollbar 7671 * @param scrollBar the scrollbar's drawable 7672 * 7673 * @see #isVerticalScrollBarEnabled() 7674 * @see #computeVerticalScrollRange() 7675 * @see #computeVerticalScrollExtent() 7676 * @see #computeVerticalScrollOffset() 7677 * @see android.widget.ScrollBarDrawable 7678 * @hide 7679 */ 7680 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 7681 int l, int t, int r, int b) { 7682 scrollBar.setBounds(l, t, r, b); 7683 scrollBar.draw(canvas); 7684 } 7685 7686 /** 7687 * Implement this to do your drawing. 7688 * 7689 * @param canvas the canvas on which the background will be drawn 7690 */ 7691 protected void onDraw(Canvas canvas) { 7692 } 7693 7694 /* 7695 * Caller is responsible for calling requestLayout if necessary. 7696 * (This allows addViewInLayout to not request a new layout.) 7697 */ 7698 void assignParent(ViewParent parent) { 7699 if (mParent == null) { 7700 mParent = parent; 7701 } else if (parent == null) { 7702 mParent = null; 7703 } else { 7704 throw new RuntimeException("view " + this + " being added, but" 7705 + " it already has a parent"); 7706 } 7707 } 7708 7709 /** 7710 * This is called when the view is attached to a window. At this point it 7711 * has a Surface and will start drawing. Note that this function is 7712 * guaranteed to be called before {@link #onDraw}, however it may be called 7713 * any time before the first onDraw -- including before or after 7714 * {@link #onMeasure}. 7715 * 7716 * @see #onDetachedFromWindow() 7717 */ 7718 protected void onAttachedToWindow() { 7719 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 7720 mParent.requestTransparentRegion(this); 7721 } 7722 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 7723 initialAwakenScrollBars(); 7724 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 7725 } 7726 jumpDrawablesToCurrentState(); 7727 } 7728 7729 /** 7730 * This is called when the view is detached from a window. At this point it 7731 * no longer has a surface for drawing. 7732 * 7733 * @see #onAttachedToWindow() 7734 */ 7735 protected void onDetachedFromWindow() { 7736 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 7737 7738 removeUnsetPressCallback(); 7739 removeLongPressCallback(); 7740 removePerformClickCallback(); 7741 7742 destroyDrawingCache(); 7743 7744 if (mHardwareLayer != null) { 7745 mHardwareLayer.destroy(); 7746 mHardwareLayer = null; 7747 } 7748 7749 if (mDisplayList != null) { 7750 mDisplayList.invalidate(); 7751 } 7752 7753 if (mAttachInfo != null) { 7754 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 7755 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_RECT_MSG, this); 7756 } 7757 7758 mCurrentAnimation = null; 7759 } 7760 7761 /** 7762 * @return The number of times this view has been attached to a window 7763 */ 7764 protected int getWindowAttachCount() { 7765 return mWindowAttachCount; 7766 } 7767 7768 /** 7769 * Retrieve a unique token identifying the window this view is attached to. 7770 * @return Return the window's token for use in 7771 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 7772 */ 7773 public IBinder getWindowToken() { 7774 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 7775 } 7776 7777 /** 7778 * Retrieve a unique token identifying the top-level "real" window of 7779 * the window that this view is attached to. That is, this is like 7780 * {@link #getWindowToken}, except if the window this view in is a panel 7781 * window (attached to another containing window), then the token of 7782 * the containing window is returned instead. 7783 * 7784 * @return Returns the associated window token, either 7785 * {@link #getWindowToken()} or the containing window's token. 7786 */ 7787 public IBinder getApplicationWindowToken() { 7788 AttachInfo ai = mAttachInfo; 7789 if (ai != null) { 7790 IBinder appWindowToken = ai.mPanelParentWindowToken; 7791 if (appWindowToken == null) { 7792 appWindowToken = ai.mWindowToken; 7793 } 7794 return appWindowToken; 7795 } 7796 return null; 7797 } 7798 7799 /** 7800 * Retrieve private session object this view hierarchy is using to 7801 * communicate with the window manager. 7802 * @return the session object to communicate with the window manager 7803 */ 7804 /*package*/ IWindowSession getWindowSession() { 7805 return mAttachInfo != null ? mAttachInfo.mSession : null; 7806 } 7807 7808 /** 7809 * @param info the {@link android.view.View.AttachInfo} to associated with 7810 * this view 7811 */ 7812 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 7813 //System.out.println("Attached! " + this); 7814 mAttachInfo = info; 7815 mWindowAttachCount++; 7816 // We will need to evaluate the drawable state at least once. 7817 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 7818 if (mFloatingTreeObserver != null) { 7819 info.mTreeObserver.merge(mFloatingTreeObserver); 7820 mFloatingTreeObserver = null; 7821 } 7822 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 7823 mAttachInfo.mScrollContainers.add(this); 7824 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 7825 } 7826 performCollectViewAttributes(visibility); 7827 onAttachedToWindow(); 7828 int vis = info.mWindowVisibility; 7829 if (vis != GONE) { 7830 onWindowVisibilityChanged(vis); 7831 } 7832 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 7833 // If nobody has evaluated the drawable state yet, then do it now. 7834 refreshDrawableState(); 7835 } 7836 } 7837 7838 void dispatchDetachedFromWindow() { 7839 //System.out.println("Detached! " + this); 7840 AttachInfo info = mAttachInfo; 7841 if (info != null) { 7842 int vis = info.mWindowVisibility; 7843 if (vis != GONE) { 7844 onWindowVisibilityChanged(GONE); 7845 } 7846 } 7847 7848 onDetachedFromWindow(); 7849 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 7850 mAttachInfo.mScrollContainers.remove(this); 7851 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 7852 } 7853 mAttachInfo = null; 7854 } 7855 7856 /** 7857 * Store this view hierarchy's frozen state into the given container. 7858 * 7859 * @param container The SparseArray in which to save the view's state. 7860 * 7861 * @see #restoreHierarchyState 7862 * @see #dispatchSaveInstanceState 7863 * @see #onSaveInstanceState 7864 */ 7865 public void saveHierarchyState(SparseArray<Parcelable> container) { 7866 dispatchSaveInstanceState(container); 7867 } 7868 7869 /** 7870 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 7871 * May be overridden to modify how freezing happens to a view's children; for example, some 7872 * views may want to not store state for their children. 7873 * 7874 * @param container The SparseArray in which to save the view's state. 7875 * 7876 * @see #dispatchRestoreInstanceState 7877 * @see #saveHierarchyState 7878 * @see #onSaveInstanceState 7879 */ 7880 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 7881 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 7882 mPrivateFlags &= ~SAVE_STATE_CALLED; 7883 Parcelable state = onSaveInstanceState(); 7884 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7885 throw new IllegalStateException( 7886 "Derived class did not call super.onSaveInstanceState()"); 7887 } 7888 if (state != null) { 7889 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 7890 // + ": " + state); 7891 container.put(mID, state); 7892 } 7893 } 7894 } 7895 7896 /** 7897 * Hook allowing a view to generate a representation of its internal state 7898 * that can later be used to create a new instance with that same state. 7899 * This state should only contain information that is not persistent or can 7900 * not be reconstructed later. For example, you will never store your 7901 * current position on screen because that will be computed again when a 7902 * new instance of the view is placed in its view hierarchy. 7903 * <p> 7904 * Some examples of things you may store here: the current cursor position 7905 * in a text view (but usually not the text itself since that is stored in a 7906 * content provider or other persistent storage), the currently selected 7907 * item in a list view. 7908 * 7909 * @return Returns a Parcelable object containing the view's current dynamic 7910 * state, or null if there is nothing interesting to save. The 7911 * default implementation returns null. 7912 * @see #onRestoreInstanceState 7913 * @see #saveHierarchyState 7914 * @see #dispatchSaveInstanceState 7915 * @see #setSaveEnabled(boolean) 7916 */ 7917 protected Parcelable onSaveInstanceState() { 7918 mPrivateFlags |= SAVE_STATE_CALLED; 7919 return BaseSavedState.EMPTY_STATE; 7920 } 7921 7922 /** 7923 * Restore this view hierarchy's frozen state from the given container. 7924 * 7925 * @param container The SparseArray which holds previously frozen states. 7926 * 7927 * @see #saveHierarchyState 7928 * @see #dispatchRestoreInstanceState 7929 * @see #onRestoreInstanceState 7930 */ 7931 public void restoreHierarchyState(SparseArray<Parcelable> container) { 7932 dispatchRestoreInstanceState(container); 7933 } 7934 7935 /** 7936 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 7937 * children. May be overridden to modify how restoreing happens to a view's children; for 7938 * example, some views may want to not store state for their children. 7939 * 7940 * @param container The SparseArray which holds previously saved state. 7941 * 7942 * @see #dispatchSaveInstanceState 7943 * @see #restoreHierarchyState 7944 * @see #onRestoreInstanceState 7945 */ 7946 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 7947 if (mID != NO_ID) { 7948 Parcelable state = container.get(mID); 7949 if (state != null) { 7950 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 7951 // + ": " + state); 7952 mPrivateFlags &= ~SAVE_STATE_CALLED; 7953 onRestoreInstanceState(state); 7954 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7955 throw new IllegalStateException( 7956 "Derived class did not call super.onRestoreInstanceState()"); 7957 } 7958 } 7959 } 7960 } 7961 7962 /** 7963 * Hook allowing a view to re-apply a representation of its internal state that had previously 7964 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 7965 * null state. 7966 * 7967 * @param state The frozen state that had previously been returned by 7968 * {@link #onSaveInstanceState}. 7969 * 7970 * @see #onSaveInstanceState 7971 * @see #restoreHierarchyState 7972 * @see #dispatchRestoreInstanceState 7973 */ 7974 protected void onRestoreInstanceState(Parcelable state) { 7975 mPrivateFlags |= SAVE_STATE_CALLED; 7976 if (state != BaseSavedState.EMPTY_STATE && state != null) { 7977 throw new IllegalArgumentException("Wrong state class, expecting View State but " 7978 + "received " + state.getClass().toString() + " instead. This usually happens " 7979 + "when two views of different type have the same id in the same hierarchy. " 7980 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 7981 + "other views do not use the same id."); 7982 } 7983 } 7984 7985 /** 7986 * <p>Return the time at which the drawing of the view hierarchy started.</p> 7987 * 7988 * @return the drawing start time in milliseconds 7989 */ 7990 public long getDrawingTime() { 7991 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 7992 } 7993 7994 /** 7995 * <p>Enables or disables the duplication of the parent's state into this view. When 7996 * duplication is enabled, this view gets its drawable state from its parent rather 7997 * than from its own internal properties.</p> 7998 * 7999 * <p>Note: in the current implementation, setting this property to true after the 8000 * view was added to a ViewGroup might have no effect at all. This property should 8001 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 8002 * 8003 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 8004 * property is enabled, an exception will be thrown.</p> 8005 * 8006 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 8007 * parent, these states should not be affected by this method.</p> 8008 * 8009 * @param enabled True to enable duplication of the parent's drawable state, false 8010 * to disable it. 8011 * 8012 * @see #getDrawableState() 8013 * @see #isDuplicateParentStateEnabled() 8014 */ 8015 public void setDuplicateParentStateEnabled(boolean enabled) { 8016 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 8017 } 8018 8019 /** 8020 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 8021 * 8022 * @return True if this view's drawable state is duplicated from the parent, 8023 * false otherwise 8024 * 8025 * @see #getDrawableState() 8026 * @see #setDuplicateParentStateEnabled(boolean) 8027 */ 8028 public boolean isDuplicateParentStateEnabled() { 8029 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 8030 } 8031 8032 /** 8033 * <p>Specifies the type of layer backing this view. The layer can be 8034 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 8035 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 8036 * 8037 * <p>A layer is associated with an optional {@link android.graphics.Paint} 8038 * instance that controls how the layer is composed on screen. The following 8039 * properties of the paint are taken into account when composing the layer:</p> 8040 * <ul> 8041 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 8042 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 8043 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 8044 * </ul> 8045 * 8046 * <p>If this view has an alpha value set to < 1.0 by calling 8047 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 8048 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 8049 * equivalent to setting a hardware layer on this view and providing a paint with 8050 * the desired alpha value.<p> 8051 * 8052 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 8053 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 8054 * for more information on when and how to use layers.</p> 8055 * 8056 * @param layerType The ype of layer to use with this view, must be one of 8057 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 8058 * {@link #LAYER_TYPE_HARDWARE} 8059 * @param paint The paint used to compose the layer. This argument is optional 8060 * and can be null. It is ignored when the layer type is 8061 * {@link #LAYER_TYPE_NONE} 8062 * 8063 * @see #getLayerType() 8064 * @see #LAYER_TYPE_NONE 8065 * @see #LAYER_TYPE_SOFTWARE 8066 * @see #LAYER_TYPE_HARDWARE 8067 * @see #setAlpha(float) 8068 * 8069 * @attr ref android.R.styleable#View_layerType 8070 */ 8071 public void setLayerType(int layerType, Paint paint) { 8072 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 8073 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 8074 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 8075 } 8076 8077 if (layerType == mLayerType) { 8078 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 8079 mLayerPaint = paint == null ? new Paint() : paint; 8080 invalidateParentCaches(); 8081 invalidate(true); 8082 } 8083 return; 8084 } 8085 8086 // Destroy any previous software drawing cache if needed 8087 switch (mLayerType) { 8088 case LAYER_TYPE_SOFTWARE: 8089 if (mDrawingCache != null) { 8090 mDrawingCache.recycle(); 8091 mDrawingCache = null; 8092 } 8093 8094 if (mUnscaledDrawingCache != null) { 8095 mUnscaledDrawingCache.recycle(); 8096 mUnscaledDrawingCache = null; 8097 } 8098 break; 8099 case LAYER_TYPE_HARDWARE: 8100 if (mHardwareLayer != null) { 8101 mHardwareLayer.destroy(); 8102 mHardwareLayer = null; 8103 } 8104 break; 8105 default: 8106 break; 8107 } 8108 8109 mLayerType = layerType; 8110 mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : (paint == null ? new Paint() : paint); 8111 8112 invalidateParentCaches(); 8113 invalidate(true); 8114 } 8115 8116 /** 8117 * Indicates what type of layer is currently associated with this view. By default 8118 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 8119 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 8120 * for more information on the different types of layers. 8121 * 8122 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 8123 * {@link #LAYER_TYPE_HARDWARE} 8124 * 8125 * @see #setLayerType(int, android.graphics.Paint) 8126 * @see #LAYER_TYPE_NONE 8127 * @see #LAYER_TYPE_SOFTWARE 8128 * @see #LAYER_TYPE_HARDWARE 8129 */ 8130 public int getLayerType() { 8131 return mLayerType; 8132 } 8133 8134 /** 8135 * <p>Returns a hardware layer that can be used to draw this view again 8136 * without executing its draw method.</p> 8137 * 8138 * @return A HardwareLayer ready to render, or null if an error occurred. 8139 */ 8140 HardwareLayer getHardwareLayer() { 8141 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8142 return null; 8143 } 8144 8145 final int width = mRight - mLeft; 8146 final int height = mBottom - mTop; 8147 8148 if (width == 0 || height == 0) { 8149 return null; 8150 } 8151 8152 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 8153 if (mHardwareLayer == null) { 8154 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 8155 width, height, isOpaque()); 8156 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 8157 mHardwareLayer.resize(width, height); 8158 } 8159 8160 Canvas currentCanvas = mAttachInfo.mHardwareCanvas; 8161 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 8162 mAttachInfo.mHardwareCanvas = canvas; 8163 try { 8164 canvas.setViewport(width, height); 8165 // TODO: We should pass the dirty rect 8166 canvas.onPreDraw(null); 8167 8168 final int restoreCount = canvas.save(); 8169 8170 computeScroll(); 8171 canvas.translate(-mScrollX, -mScrollY); 8172 8173 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8174 8175 // Fast path for layouts with no backgrounds 8176 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8177 mPrivateFlags &= ~DIRTY_MASK; 8178 dispatchDraw(canvas); 8179 } else { 8180 draw(canvas); 8181 } 8182 8183 canvas.restoreToCount(restoreCount); 8184 } finally { 8185 canvas.onPostDraw(); 8186 mHardwareLayer.end(currentCanvas); 8187 mAttachInfo.mHardwareCanvas = currentCanvas; 8188 } 8189 } 8190 8191 return mHardwareLayer; 8192 } 8193 8194 /** 8195 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 8196 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 8197 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 8198 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 8199 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 8200 * null.</p> 8201 * 8202 * <p>Enabling the drawing cache is similar to 8203 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 8204 * acceleration is turned off. When hardware acceleration is turned on, enabling the 8205 * drawing cache has no effect on rendering because the system uses a different mechanism 8206 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 8207 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 8208 * for information on how to enable software and hardware layers.</p> 8209 * 8210 * <p>This API can be used to manually generate 8211 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 8212 * {@link #getDrawingCache()}.</p> 8213 * 8214 * @param enabled true to enable the drawing cache, false otherwise 8215 * 8216 * @see #isDrawingCacheEnabled() 8217 * @see #getDrawingCache() 8218 * @see #buildDrawingCache() 8219 * @see #setLayerType(int, android.graphics.Paint) 8220 */ 8221 public void setDrawingCacheEnabled(boolean enabled) { 8222 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 8223 } 8224 8225 /** 8226 * <p>Indicates whether the drawing cache is enabled for this view.</p> 8227 * 8228 * @return true if the drawing cache is enabled 8229 * 8230 * @see #setDrawingCacheEnabled(boolean) 8231 * @see #getDrawingCache() 8232 */ 8233 @ViewDebug.ExportedProperty(category = "drawing") 8234 public boolean isDrawingCacheEnabled() { 8235 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 8236 } 8237 8238 /** 8239 * Debugging utility which recursively outputs the dirty state of a view and its 8240 * descendants. 8241 * 8242 * @hide 8243 */ 8244 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 8245 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 8246 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 8247 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 8248 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 8249 if (clear) { 8250 mPrivateFlags &= clearMask; 8251 } 8252 if (this instanceof ViewGroup) { 8253 ViewGroup parent = (ViewGroup) this; 8254 final int count = parent.getChildCount(); 8255 for (int i = 0; i < count; i++) { 8256 final View child = parent.getChildAt(i); 8257 child.outputDirtyFlags(indent + " ", clear, clearMask); 8258 } 8259 } 8260 } 8261 8262 /** 8263 * This method is used by ViewGroup to cause its children to restore or recreate their 8264 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 8265 * to recreate its own display list, which would happen if it went through the normal 8266 * draw/dispatchDraw mechanisms. 8267 * 8268 * @hide 8269 */ 8270 protected void dispatchGetDisplayList() {} 8271 8272 /** 8273 * <p>Returns a display list that can be used to draw this view again 8274 * without executing its draw method.</p> 8275 * 8276 * @return A DisplayList ready to replay, or null if caching is not enabled. 8277 * 8278 * @hide 8279 */ 8280 public DisplayList getDisplayList() { 8281 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8282 return null; 8283 } 8284 8285 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 8286 mDisplayList == null || !mDisplayList.isValid() || 8287 mRecreateDisplayList)) { 8288 // Don't need to recreate the display list, just need to tell our 8289 // children to restore/recreate theirs 8290 if (mDisplayList != null && mDisplayList.isValid() && 8291 !mRecreateDisplayList) { 8292 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8293 mPrivateFlags &= ~DIRTY_MASK; 8294 dispatchGetDisplayList(); 8295 8296 return mDisplayList; 8297 } 8298 8299 // If we got here, we're recreating it. Mark it as such to ensure that 8300 // we copy in child display lists into ours in drawChild() 8301 mRecreateDisplayList = true; 8302 if (mDisplayList == null) { 8303 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(this); 8304 // If we're creating a new display list, make sure our parent gets invalidated 8305 // since they will need to recreate their display list to account for this 8306 // new child display list. 8307 invalidateParentCaches(); 8308 } 8309 8310 final HardwareCanvas canvas = mDisplayList.start(); 8311 try { 8312 int width = mRight - mLeft; 8313 int height = mBottom - mTop; 8314 8315 canvas.setViewport(width, height); 8316 // The dirty rect should always be null for a display list 8317 canvas.onPreDraw(null); 8318 8319 final int restoreCount = canvas.save(); 8320 8321 computeScroll(); 8322 canvas.translate(-mScrollX, -mScrollY); 8323 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8324 8325 // Fast path for layouts with no backgrounds 8326 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8327 mPrivateFlags &= ~DIRTY_MASK; 8328 dispatchDraw(canvas); 8329 } else { 8330 draw(canvas); 8331 } 8332 8333 canvas.restoreToCount(restoreCount); 8334 } finally { 8335 canvas.onPostDraw(); 8336 8337 mDisplayList.end(); 8338 } 8339 } else { 8340 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8341 mPrivateFlags &= ~DIRTY_MASK; 8342 } 8343 8344 return mDisplayList; 8345 } 8346 8347 /** 8348 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 8349 * 8350 * @return A non-scaled bitmap representing this view or null if cache is disabled. 8351 * 8352 * @see #getDrawingCache(boolean) 8353 */ 8354 public Bitmap getDrawingCache() { 8355 return getDrawingCache(false); 8356 } 8357 8358 /** 8359 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 8360 * is null when caching is disabled. If caching is enabled and the cache is not ready, 8361 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 8362 * draw from the cache when the cache is enabled. To benefit from the cache, you must 8363 * request the drawing cache by calling this method and draw it on screen if the 8364 * returned bitmap is not null.</p> 8365 * 8366 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8367 * this method will create a bitmap of the same size as this view. Because this bitmap 8368 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8369 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8370 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8371 * size than the view. This implies that your application must be able to handle this 8372 * size.</p> 8373 * 8374 * @param autoScale Indicates whether the generated bitmap should be scaled based on 8375 * the current density of the screen when the application is in compatibility 8376 * mode. 8377 * 8378 * @return A bitmap representing this view or null if cache is disabled. 8379 * 8380 * @see #setDrawingCacheEnabled(boolean) 8381 * @see #isDrawingCacheEnabled() 8382 * @see #buildDrawingCache(boolean) 8383 * @see #destroyDrawingCache() 8384 */ 8385 public Bitmap getDrawingCache(boolean autoScale) { 8386 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8387 return null; 8388 } 8389 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 8390 buildDrawingCache(autoScale); 8391 } 8392 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 8393 } 8394 8395 /** 8396 * <p>Frees the resources used by the drawing cache. If you call 8397 * {@link #buildDrawingCache()} manually without calling 8398 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8399 * should cleanup the cache with this method afterwards.</p> 8400 * 8401 * @see #setDrawingCacheEnabled(boolean) 8402 * @see #buildDrawingCache() 8403 * @see #getDrawingCache() 8404 */ 8405 public void destroyDrawingCache() { 8406 if (mDrawingCache != null) { 8407 mDrawingCache.recycle(); 8408 mDrawingCache = null; 8409 } 8410 if (mUnscaledDrawingCache != null) { 8411 mUnscaledDrawingCache.recycle(); 8412 mUnscaledDrawingCache = null; 8413 } 8414 } 8415 8416 /** 8417 * Setting a solid background color for the drawing cache's bitmaps will improve 8418 * perfromance and memory usage. Note, though that this should only be used if this 8419 * view will always be drawn on top of a solid color. 8420 * 8421 * @param color The background color to use for the drawing cache's bitmap 8422 * 8423 * @see #setDrawingCacheEnabled(boolean) 8424 * @see #buildDrawingCache() 8425 * @see #getDrawingCache() 8426 */ 8427 public void setDrawingCacheBackgroundColor(int color) { 8428 if (color != mDrawingCacheBackgroundColor) { 8429 mDrawingCacheBackgroundColor = color; 8430 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8431 } 8432 } 8433 8434 /** 8435 * @see #setDrawingCacheBackgroundColor(int) 8436 * 8437 * @return The background color to used for the drawing cache's bitmap 8438 */ 8439 public int getDrawingCacheBackgroundColor() { 8440 return mDrawingCacheBackgroundColor; 8441 } 8442 8443 /** 8444 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 8445 * 8446 * @see #buildDrawingCache(boolean) 8447 */ 8448 public void buildDrawingCache() { 8449 buildDrawingCache(false); 8450 } 8451 8452 /** 8453 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 8454 * 8455 * <p>If you call {@link #buildDrawingCache()} manually without calling 8456 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8457 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 8458 * 8459 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8460 * this method will create a bitmap of the same size as this view. Because this bitmap 8461 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8462 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8463 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8464 * size than the view. This implies that your application must be able to handle this 8465 * size.</p> 8466 * 8467 * <p>You should avoid calling this method when hardware acceleration is enabled. If 8468 * you do not need the drawing cache bitmap, calling this method will increase memory 8469 * usage and cause the view to be rendered in software once, thus negatively impacting 8470 * performance.</p> 8471 * 8472 * @see #getDrawingCache() 8473 * @see #destroyDrawingCache() 8474 */ 8475 public void buildDrawingCache(boolean autoScale) { 8476 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 8477 mDrawingCache == null : mUnscaledDrawingCache == null)) { 8478 8479 if (ViewDebug.TRACE_HIERARCHY) { 8480 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 8481 } 8482 8483 int width = mRight - mLeft; 8484 int height = mBottom - mTop; 8485 8486 final AttachInfo attachInfo = mAttachInfo; 8487 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 8488 8489 if (autoScale && scalingRequired) { 8490 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 8491 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 8492 } 8493 8494 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 8495 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 8496 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 8497 8498 if (width <= 0 || height <= 0 || 8499 // Projected bitmap size in bytes 8500 (width * height * (opaque && !use32BitCache ? 2 : 4) > 8501 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 8502 destroyDrawingCache(); 8503 return; 8504 } 8505 8506 boolean clear = true; 8507 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 8508 8509 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 8510 Bitmap.Config quality; 8511 if (!opaque) { 8512 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 8513 case DRAWING_CACHE_QUALITY_AUTO: 8514 quality = Bitmap.Config.ARGB_8888; 8515 break; 8516 case DRAWING_CACHE_QUALITY_LOW: 8517 quality = Bitmap.Config.ARGB_4444; 8518 break; 8519 case DRAWING_CACHE_QUALITY_HIGH: 8520 quality = Bitmap.Config.ARGB_8888; 8521 break; 8522 default: 8523 quality = Bitmap.Config.ARGB_8888; 8524 break; 8525 } 8526 } else { 8527 // Optimization for translucent windows 8528 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 8529 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 8530 } 8531 8532 // Try to cleanup memory 8533 if (bitmap != null) bitmap.recycle(); 8534 8535 try { 8536 bitmap = Bitmap.createBitmap(width, height, quality); 8537 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8538 if (autoScale) { 8539 mDrawingCache = bitmap; 8540 } else { 8541 mUnscaledDrawingCache = bitmap; 8542 } 8543 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 8544 } catch (OutOfMemoryError e) { 8545 // If there is not enough memory to create the bitmap cache, just 8546 // ignore the issue as bitmap caches are not required to draw the 8547 // view hierarchy 8548 if (autoScale) { 8549 mDrawingCache = null; 8550 } else { 8551 mUnscaledDrawingCache = null; 8552 } 8553 return; 8554 } 8555 8556 clear = drawingCacheBackgroundColor != 0; 8557 } 8558 8559 Canvas canvas; 8560 if (attachInfo != null) { 8561 canvas = attachInfo.mCanvas; 8562 if (canvas == null) { 8563 canvas = new Canvas(); 8564 } 8565 canvas.setBitmap(bitmap); 8566 // Temporarily clobber the cached Canvas in case one of our children 8567 // is also using a drawing cache. Without this, the children would 8568 // steal the canvas by attaching their own bitmap to it and bad, bad 8569 // thing would happen (invisible views, corrupted drawings, etc.) 8570 attachInfo.mCanvas = null; 8571 } else { 8572 // This case should hopefully never or seldom happen 8573 canvas = new Canvas(bitmap); 8574 } 8575 8576 if (clear) { 8577 bitmap.eraseColor(drawingCacheBackgroundColor); 8578 } 8579 8580 computeScroll(); 8581 final int restoreCount = canvas.save(); 8582 8583 if (autoScale && scalingRequired) { 8584 final float scale = attachInfo.mApplicationScale; 8585 canvas.scale(scale, scale); 8586 } 8587 8588 canvas.translate(-mScrollX, -mScrollY); 8589 8590 mPrivateFlags |= DRAWN; 8591 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 8592 mLayerType != LAYER_TYPE_NONE) { 8593 mPrivateFlags |= DRAWING_CACHE_VALID; 8594 } 8595 8596 // Fast path for layouts with no backgrounds 8597 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8598 if (ViewDebug.TRACE_HIERARCHY) { 8599 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8600 } 8601 mPrivateFlags &= ~DIRTY_MASK; 8602 dispatchDraw(canvas); 8603 } else { 8604 draw(canvas); 8605 } 8606 8607 canvas.restoreToCount(restoreCount); 8608 8609 if (attachInfo != null) { 8610 // Restore the cached Canvas for our siblings 8611 attachInfo.mCanvas = canvas; 8612 } 8613 } 8614 } 8615 8616 /** 8617 * Create a snapshot of the view into a bitmap. We should probably make 8618 * some form of this public, but should think about the API. 8619 */ 8620 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 8621 int width = mRight - mLeft; 8622 int height = mBottom - mTop; 8623 8624 final AttachInfo attachInfo = mAttachInfo; 8625 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 8626 width = (int) ((width * scale) + 0.5f); 8627 height = (int) ((height * scale) + 0.5f); 8628 8629 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 8630 if (bitmap == null) { 8631 throw new OutOfMemoryError(); 8632 } 8633 8634 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8635 8636 Canvas canvas; 8637 if (attachInfo != null) { 8638 canvas = attachInfo.mCanvas; 8639 if (canvas == null) { 8640 canvas = new Canvas(); 8641 } 8642 canvas.setBitmap(bitmap); 8643 // Temporarily clobber the cached Canvas in case one of our children 8644 // is also using a drawing cache. Without this, the children would 8645 // steal the canvas by attaching their own bitmap to it and bad, bad 8646 // things would happen (invisible views, corrupted drawings, etc.) 8647 attachInfo.mCanvas = null; 8648 } else { 8649 // This case should hopefully never or seldom happen 8650 canvas = new Canvas(bitmap); 8651 } 8652 8653 if ((backgroundColor & 0xff000000) != 0) { 8654 bitmap.eraseColor(backgroundColor); 8655 } 8656 8657 computeScroll(); 8658 final int restoreCount = canvas.save(); 8659 canvas.scale(scale, scale); 8660 canvas.translate(-mScrollX, -mScrollY); 8661 8662 // Temporarily remove the dirty mask 8663 int flags = mPrivateFlags; 8664 mPrivateFlags &= ~DIRTY_MASK; 8665 8666 // Fast path for layouts with no backgrounds 8667 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8668 dispatchDraw(canvas); 8669 } else { 8670 draw(canvas); 8671 } 8672 8673 mPrivateFlags = flags; 8674 8675 canvas.restoreToCount(restoreCount); 8676 8677 if (attachInfo != null) { 8678 // Restore the cached Canvas for our siblings 8679 attachInfo.mCanvas = canvas; 8680 } 8681 8682 return bitmap; 8683 } 8684 8685 /** 8686 * Indicates whether this View is currently in edit mode. A View is usually 8687 * in edit mode when displayed within a developer tool. For instance, if 8688 * this View is being drawn by a visual user interface builder, this method 8689 * should return true. 8690 * 8691 * Subclasses should check the return value of this method to provide 8692 * different behaviors if their normal behavior might interfere with the 8693 * host environment. For instance: the class spawns a thread in its 8694 * constructor, the drawing code relies on device-specific features, etc. 8695 * 8696 * This method is usually checked in the drawing code of custom widgets. 8697 * 8698 * @return True if this View is in edit mode, false otherwise. 8699 */ 8700 public boolean isInEditMode() { 8701 return false; 8702 } 8703 8704 /** 8705 * If the View draws content inside its padding and enables fading edges, 8706 * it needs to support padding offsets. Padding offsets are added to the 8707 * fading edges to extend the length of the fade so that it covers pixels 8708 * drawn inside the padding. 8709 * 8710 * Subclasses of this class should override this method if they need 8711 * to draw content inside the padding. 8712 * 8713 * @return True if padding offset must be applied, false otherwise. 8714 * 8715 * @see #getLeftPaddingOffset() 8716 * @see #getRightPaddingOffset() 8717 * @see #getTopPaddingOffset() 8718 * @see #getBottomPaddingOffset() 8719 * 8720 * @since CURRENT 8721 */ 8722 protected boolean isPaddingOffsetRequired() { 8723 return false; 8724 } 8725 8726 /** 8727 * Amount by which to extend the left fading region. Called only when 8728 * {@link #isPaddingOffsetRequired()} returns true. 8729 * 8730 * @return The left padding offset in pixels. 8731 * 8732 * @see #isPaddingOffsetRequired() 8733 * 8734 * @since CURRENT 8735 */ 8736 protected int getLeftPaddingOffset() { 8737 return 0; 8738 } 8739 8740 /** 8741 * Amount by which to extend the right fading region. Called only when 8742 * {@link #isPaddingOffsetRequired()} returns true. 8743 * 8744 * @return The right padding offset in pixels. 8745 * 8746 * @see #isPaddingOffsetRequired() 8747 * 8748 * @since CURRENT 8749 */ 8750 protected int getRightPaddingOffset() { 8751 return 0; 8752 } 8753 8754 /** 8755 * Amount by which to extend the top fading region. Called only when 8756 * {@link #isPaddingOffsetRequired()} returns true. 8757 * 8758 * @return The top padding offset in pixels. 8759 * 8760 * @see #isPaddingOffsetRequired() 8761 * 8762 * @since CURRENT 8763 */ 8764 protected int getTopPaddingOffset() { 8765 return 0; 8766 } 8767 8768 /** 8769 * Amount by which to extend the bottom fading region. Called only when 8770 * {@link #isPaddingOffsetRequired()} returns true. 8771 * 8772 * @return The bottom padding offset in pixels. 8773 * 8774 * @see #isPaddingOffsetRequired() 8775 * 8776 * @since CURRENT 8777 */ 8778 protected int getBottomPaddingOffset() { 8779 return 0; 8780 } 8781 8782 /** 8783 * <p>Indicates whether this view is attached to an hardware accelerated 8784 * window or not.</p> 8785 * 8786 * <p>Even if this method returns true, it does not mean that every call 8787 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 8788 * accelerated {@link android.graphics.Canvas}. For instance, if this view 8789 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 8790 * window is hardware accelerated, 8791 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 8792 * return false, and this method will return true.</p> 8793 * 8794 * @return True if the view is attached to a window and the window is 8795 * hardware accelerated; false in any other case. 8796 */ 8797 public boolean isHardwareAccelerated() { 8798 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 8799 } 8800 8801 /** 8802 * Manually render this view (and all of its children) to the given Canvas. 8803 * The view must have already done a full layout before this function is 8804 * called. When implementing a view, implement {@link #onDraw} instead of 8805 * overriding this method. If you do need to override this method, call 8806 * the superclass version. 8807 * 8808 * @param canvas The Canvas to which the View is rendered. 8809 */ 8810 public void draw(Canvas canvas) { 8811 if (ViewDebug.TRACE_HIERARCHY) { 8812 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8813 } 8814 8815 final int privateFlags = mPrivateFlags; 8816 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 8817 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 8818 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 8819 8820 /* 8821 * Draw traversal performs several drawing steps which must be executed 8822 * in the appropriate order: 8823 * 8824 * 1. Draw the background 8825 * 2. If necessary, save the canvas' layers to prepare for fading 8826 * 3. Draw view's content 8827 * 4. Draw children 8828 * 5. If necessary, draw the fading edges and restore layers 8829 * 6. Draw decorations (scrollbars for instance) 8830 */ 8831 8832 // Step 1, draw the background, if needed 8833 int saveCount; 8834 8835 if (!dirtyOpaque) { 8836 final Drawable background = mBGDrawable; 8837 if (background != null) { 8838 final int scrollX = mScrollX; 8839 final int scrollY = mScrollY; 8840 8841 if (mBackgroundSizeChanged) { 8842 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 8843 mBackgroundSizeChanged = false; 8844 } 8845 8846 if ((scrollX | scrollY) == 0) { 8847 background.draw(canvas); 8848 } else { 8849 canvas.translate(scrollX, scrollY); 8850 background.draw(canvas); 8851 canvas.translate(-scrollX, -scrollY); 8852 } 8853 } 8854 } 8855 8856 // skip step 2 & 5 if possible (common case) 8857 final int viewFlags = mViewFlags; 8858 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 8859 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 8860 if (!verticalEdges && !horizontalEdges) { 8861 // Step 3, draw the content 8862 if (!dirtyOpaque) onDraw(canvas); 8863 8864 // Step 4, draw the children 8865 dispatchDraw(canvas); 8866 8867 // Step 6, draw decorations (scrollbars) 8868 onDrawScrollBars(canvas); 8869 8870 // we're done... 8871 return; 8872 } 8873 8874 /* 8875 * Here we do the full fledged routine... 8876 * (this is an uncommon case where speed matters less, 8877 * this is why we repeat some of the tests that have been 8878 * done above) 8879 */ 8880 8881 boolean drawTop = false; 8882 boolean drawBottom = false; 8883 boolean drawLeft = false; 8884 boolean drawRight = false; 8885 8886 float topFadeStrength = 0.0f; 8887 float bottomFadeStrength = 0.0f; 8888 float leftFadeStrength = 0.0f; 8889 float rightFadeStrength = 0.0f; 8890 8891 // Step 2, save the canvas' layers 8892 int paddingLeft = mPaddingLeft; 8893 int paddingTop = mPaddingTop; 8894 8895 final boolean offsetRequired = isPaddingOffsetRequired(); 8896 if (offsetRequired) { 8897 paddingLeft += getLeftPaddingOffset(); 8898 paddingTop += getTopPaddingOffset(); 8899 } 8900 8901 int left = mScrollX + paddingLeft; 8902 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 8903 int top = mScrollY + paddingTop; 8904 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 8905 8906 if (offsetRequired) { 8907 right += getRightPaddingOffset(); 8908 bottom += getBottomPaddingOffset(); 8909 } 8910 8911 final ScrollabilityCache scrollabilityCache = mScrollCache; 8912 int length = scrollabilityCache.fadingEdgeLength; 8913 8914 // clip the fade length if top and bottom fades overlap 8915 // overlapping fades produce odd-looking artifacts 8916 if (verticalEdges && (top + length > bottom - length)) { 8917 length = (bottom - top) / 2; 8918 } 8919 8920 // also clip horizontal fades if necessary 8921 if (horizontalEdges && (left + length > right - length)) { 8922 length = (right - left) / 2; 8923 } 8924 8925 if (verticalEdges) { 8926 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 8927 drawTop = topFadeStrength > 0.0f; 8928 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 8929 drawBottom = bottomFadeStrength > 0.0f; 8930 } 8931 8932 if (horizontalEdges) { 8933 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 8934 drawLeft = leftFadeStrength > 0.0f; 8935 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 8936 drawRight = rightFadeStrength > 0.0f; 8937 } 8938 8939 saveCount = canvas.getSaveCount(); 8940 8941 int solidColor = getSolidColor(); 8942 if (solidColor == 0) { 8943 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 8944 8945 if (drawTop) { 8946 canvas.saveLayer(left, top, right, top + length, null, flags); 8947 } 8948 8949 if (drawBottom) { 8950 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 8951 } 8952 8953 if (drawLeft) { 8954 canvas.saveLayer(left, top, left + length, bottom, null, flags); 8955 } 8956 8957 if (drawRight) { 8958 canvas.saveLayer(right - length, top, right, bottom, null, flags); 8959 } 8960 } else { 8961 scrollabilityCache.setFadeColor(solidColor); 8962 } 8963 8964 // Step 3, draw the content 8965 if (!dirtyOpaque) onDraw(canvas); 8966 8967 // Step 4, draw the children 8968 dispatchDraw(canvas); 8969 8970 // Step 5, draw the fade effect and restore layers 8971 final Paint p = scrollabilityCache.paint; 8972 final Matrix matrix = scrollabilityCache.matrix; 8973 final Shader fade = scrollabilityCache.shader; 8974 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 8975 8976 if (drawTop) { 8977 matrix.setScale(1, fadeHeight * topFadeStrength); 8978 matrix.postTranslate(left, top); 8979 fade.setLocalMatrix(matrix); 8980 canvas.drawRect(left, top, right, top + length, p); 8981 } 8982 8983 if (drawBottom) { 8984 matrix.setScale(1, fadeHeight * bottomFadeStrength); 8985 matrix.postRotate(180); 8986 matrix.postTranslate(left, bottom); 8987 fade.setLocalMatrix(matrix); 8988 canvas.drawRect(left, bottom - length, right, bottom, p); 8989 } 8990 8991 if (drawLeft) { 8992 matrix.setScale(1, fadeHeight * leftFadeStrength); 8993 matrix.postRotate(-90); 8994 matrix.postTranslate(left, top); 8995 fade.setLocalMatrix(matrix); 8996 canvas.drawRect(left, top, left + length, bottom, p); 8997 } 8998 8999 if (drawRight) { 9000 matrix.setScale(1, fadeHeight * rightFadeStrength); 9001 matrix.postRotate(90); 9002 matrix.postTranslate(right, top); 9003 fade.setLocalMatrix(matrix); 9004 canvas.drawRect(right - length, top, right, bottom, p); 9005 } 9006 9007 canvas.restoreToCount(saveCount); 9008 9009 // Step 6, draw decorations (scrollbars) 9010 onDrawScrollBars(canvas); 9011 } 9012 9013 /** 9014 * Override this if your view is known to always be drawn on top of a solid color background, 9015 * and needs to draw fading edges. Returning a non-zero color enables the view system to 9016 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 9017 * should be set to 0xFF. 9018 * 9019 * @see #setVerticalFadingEdgeEnabled 9020 * @see #setHorizontalFadingEdgeEnabled 9021 * 9022 * @return The known solid color background for this view, or 0 if the color may vary 9023 */ 9024 public int getSolidColor() { 9025 return 0; 9026 } 9027 9028 /** 9029 * Build a human readable string representation of the specified view flags. 9030 * 9031 * @param flags the view flags to convert to a string 9032 * @return a String representing the supplied flags 9033 */ 9034 private static String printFlags(int flags) { 9035 String output = ""; 9036 int numFlags = 0; 9037 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 9038 output += "TAKES_FOCUS"; 9039 numFlags++; 9040 } 9041 9042 switch (flags & VISIBILITY_MASK) { 9043 case INVISIBLE: 9044 if (numFlags > 0) { 9045 output += " "; 9046 } 9047 output += "INVISIBLE"; 9048 // USELESS HERE numFlags++; 9049 break; 9050 case GONE: 9051 if (numFlags > 0) { 9052 output += " "; 9053 } 9054 output += "GONE"; 9055 // USELESS HERE numFlags++; 9056 break; 9057 default: 9058 break; 9059 } 9060 return output; 9061 } 9062 9063 /** 9064 * Build a human readable string representation of the specified private 9065 * view flags. 9066 * 9067 * @param privateFlags the private view flags to convert to a string 9068 * @return a String representing the supplied flags 9069 */ 9070 private static String printPrivateFlags(int privateFlags) { 9071 String output = ""; 9072 int numFlags = 0; 9073 9074 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 9075 output += "WANTS_FOCUS"; 9076 numFlags++; 9077 } 9078 9079 if ((privateFlags & FOCUSED) == FOCUSED) { 9080 if (numFlags > 0) { 9081 output += " "; 9082 } 9083 output += "FOCUSED"; 9084 numFlags++; 9085 } 9086 9087 if ((privateFlags & SELECTED) == SELECTED) { 9088 if (numFlags > 0) { 9089 output += " "; 9090 } 9091 output += "SELECTED"; 9092 numFlags++; 9093 } 9094 9095 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 9096 if (numFlags > 0) { 9097 output += " "; 9098 } 9099 output += "IS_ROOT_NAMESPACE"; 9100 numFlags++; 9101 } 9102 9103 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 9104 if (numFlags > 0) { 9105 output += " "; 9106 } 9107 output += "HAS_BOUNDS"; 9108 numFlags++; 9109 } 9110 9111 if ((privateFlags & DRAWN) == DRAWN) { 9112 if (numFlags > 0) { 9113 output += " "; 9114 } 9115 output += "DRAWN"; 9116 // USELESS HERE numFlags++; 9117 } 9118 return output; 9119 } 9120 9121 /** 9122 * <p>Indicates whether or not this view's layout will be requested during 9123 * the next hierarchy layout pass.</p> 9124 * 9125 * @return true if the layout will be forced during next layout pass 9126 */ 9127 public boolean isLayoutRequested() { 9128 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 9129 } 9130 9131 /** 9132 * Assign a size and position to a view and all of its 9133 * descendants 9134 * 9135 * <p>This is the second phase of the layout mechanism. 9136 * (The first is measuring). In this phase, each parent calls 9137 * layout on all of its children to position them. 9138 * This is typically done using the child measurements 9139 * that were stored in the measure pass().</p> 9140 * 9141 * <p>Derived classes should not override this method. 9142 * Derived classes with children should override 9143 * onLayout. In that method, they should 9144 * call layout on each of their children.</p> 9145 * 9146 * @param l Left position, relative to parent 9147 * @param t Top position, relative to parent 9148 * @param r Right position, relative to parent 9149 * @param b Bottom position, relative to parent 9150 */ 9151 @SuppressWarnings({"unchecked"}) 9152 public void layout(int l, int t, int r, int b) { 9153 int oldL = mLeft; 9154 int oldT = mTop; 9155 int oldB = mBottom; 9156 int oldR = mRight; 9157 boolean changed = setFrame(l, t, r, b); 9158 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 9159 if (ViewDebug.TRACE_HIERARCHY) { 9160 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 9161 } 9162 9163 onLayout(changed, l, t, r, b); 9164 mPrivateFlags &= ~LAYOUT_REQUIRED; 9165 9166 if (mOnLayoutChangeListeners != null) { 9167 ArrayList<OnLayoutChangeListener> listenersCopy = 9168 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 9169 int numListeners = listenersCopy.size(); 9170 for (int i = 0; i < numListeners; ++i) { 9171 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 9172 } 9173 } 9174 } 9175 mPrivateFlags &= ~FORCE_LAYOUT; 9176 } 9177 9178 /** 9179 * Called from layout when this view should 9180 * assign a size and position to each of its children. 9181 * 9182 * Derived classes with children should override 9183 * this method and call layout on each of 9184 * their children. 9185 * @param changed This is a new size or position for this view 9186 * @param left Left position, relative to parent 9187 * @param top Top position, relative to parent 9188 * @param right Right position, relative to parent 9189 * @param bottom Bottom position, relative to parent 9190 */ 9191 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 9192 } 9193 9194 /** 9195 * Assign a size and position to this view. 9196 * 9197 * This is called from layout. 9198 * 9199 * @param left Left position, relative to parent 9200 * @param top Top position, relative to parent 9201 * @param right Right position, relative to parent 9202 * @param bottom Bottom position, relative to parent 9203 * @return true if the new size and position are different than the 9204 * previous ones 9205 * {@hide} 9206 */ 9207 protected boolean setFrame(int left, int top, int right, int bottom) { 9208 boolean changed = false; 9209 9210 if (DBG) { 9211 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 9212 + right + "," + bottom + ")"); 9213 } 9214 9215 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 9216 changed = true; 9217 9218 // Remember our drawn bit 9219 int drawn = mPrivateFlags & DRAWN; 9220 9221 // Invalidate our old position 9222 invalidate(true); 9223 9224 9225 int oldWidth = mRight - mLeft; 9226 int oldHeight = mBottom - mTop; 9227 9228 mLeft = left; 9229 mTop = top; 9230 mRight = right; 9231 mBottom = bottom; 9232 9233 mPrivateFlags |= HAS_BOUNDS; 9234 9235 int newWidth = right - left; 9236 int newHeight = bottom - top; 9237 9238 if (newWidth != oldWidth || newHeight != oldHeight) { 9239 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9240 // A change in dimension means an auto-centered pivot point changes, too 9241 mMatrixDirty = true; 9242 } 9243 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 9244 } 9245 9246 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 9247 // If we are visible, force the DRAWN bit to on so that 9248 // this invalidate will go through (at least to our parent). 9249 // This is because someone may have invalidated this view 9250 // before this call to setFrame came in, thereby clearing 9251 // the DRAWN bit. 9252 mPrivateFlags |= DRAWN; 9253 invalidate(true); 9254 } 9255 9256 // Reset drawn bit to original value (invalidate turns it off) 9257 mPrivateFlags |= drawn; 9258 9259 mBackgroundSizeChanged = true; 9260 } 9261 return changed; 9262 } 9263 9264 /** 9265 * Finalize inflating a view from XML. This is called as the last phase 9266 * of inflation, after all child views have been added. 9267 * 9268 * <p>Even if the subclass overrides onFinishInflate, they should always be 9269 * sure to call the super method, so that we get called. 9270 */ 9271 protected void onFinishInflate() { 9272 } 9273 9274 /** 9275 * Returns the resources associated with this view. 9276 * 9277 * @return Resources object. 9278 */ 9279 public Resources getResources() { 9280 return mResources; 9281 } 9282 9283 /** 9284 * Invalidates the specified Drawable. 9285 * 9286 * @param drawable the drawable to invalidate 9287 */ 9288 public void invalidateDrawable(Drawable drawable) { 9289 if (verifyDrawable(drawable)) { 9290 final Rect dirty = drawable.getBounds(); 9291 final int scrollX = mScrollX; 9292 final int scrollY = mScrollY; 9293 9294 invalidate(dirty.left + scrollX, dirty.top + scrollY, 9295 dirty.right + scrollX, dirty.bottom + scrollY); 9296 } 9297 } 9298 9299 /** 9300 * Schedules an action on a drawable to occur at a specified time. 9301 * 9302 * @param who the recipient of the action 9303 * @param what the action to run on the drawable 9304 * @param when the time at which the action must occur. Uses the 9305 * {@link SystemClock#uptimeMillis} timebase. 9306 */ 9307 public void scheduleDrawable(Drawable who, Runnable what, long when) { 9308 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9309 mAttachInfo.mHandler.postAtTime(what, who, when); 9310 } 9311 } 9312 9313 /** 9314 * Cancels a scheduled action on a drawable. 9315 * 9316 * @param who the recipient of the action 9317 * @param what the action to cancel 9318 */ 9319 public void unscheduleDrawable(Drawable who, Runnable what) { 9320 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9321 mAttachInfo.mHandler.removeCallbacks(what, who); 9322 } 9323 } 9324 9325 /** 9326 * Unschedule any events associated with the given Drawable. This can be 9327 * used when selecting a new Drawable into a view, so that the previous 9328 * one is completely unscheduled. 9329 * 9330 * @param who The Drawable to unschedule. 9331 * 9332 * @see #drawableStateChanged 9333 */ 9334 public void unscheduleDrawable(Drawable who) { 9335 if (mAttachInfo != null) { 9336 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 9337 } 9338 } 9339 9340 /** 9341 * If your view subclass is displaying its own Drawable objects, it should 9342 * override this function and return true for any Drawable it is 9343 * displaying. This allows animations for those drawables to be 9344 * scheduled. 9345 * 9346 * <p>Be sure to call through to the super class when overriding this 9347 * function. 9348 * 9349 * @param who The Drawable to verify. Return true if it is one you are 9350 * displaying, else return the result of calling through to the 9351 * super class. 9352 * 9353 * @return boolean If true than the Drawable is being displayed in the 9354 * view; else false and it is not allowed to animate. 9355 * 9356 * @see #unscheduleDrawable 9357 * @see #drawableStateChanged 9358 */ 9359 protected boolean verifyDrawable(Drawable who) { 9360 return who == mBGDrawable; 9361 } 9362 9363 /** 9364 * This function is called whenever the state of the view changes in such 9365 * a way that it impacts the state of drawables being shown. 9366 * 9367 * <p>Be sure to call through to the superclass when overriding this 9368 * function. 9369 * 9370 * @see Drawable#setState 9371 */ 9372 protected void drawableStateChanged() { 9373 Drawable d = mBGDrawable; 9374 if (d != null && d.isStateful()) { 9375 d.setState(getDrawableState()); 9376 } 9377 } 9378 9379 /** 9380 * Call this to force a view to update its drawable state. This will cause 9381 * drawableStateChanged to be called on this view. Views that are interested 9382 * in the new state should call getDrawableState. 9383 * 9384 * @see #drawableStateChanged 9385 * @see #getDrawableState 9386 */ 9387 public void refreshDrawableState() { 9388 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9389 drawableStateChanged(); 9390 9391 ViewParent parent = mParent; 9392 if (parent != null) { 9393 parent.childDrawableStateChanged(this); 9394 } 9395 } 9396 9397 /** 9398 * Return an array of resource IDs of the drawable states representing the 9399 * current state of the view. 9400 * 9401 * @return The current drawable state 9402 * 9403 * @see Drawable#setState 9404 * @see #drawableStateChanged 9405 * @see #onCreateDrawableState 9406 */ 9407 public final int[] getDrawableState() { 9408 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 9409 return mDrawableState; 9410 } else { 9411 mDrawableState = onCreateDrawableState(0); 9412 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 9413 return mDrawableState; 9414 } 9415 } 9416 9417 /** 9418 * Generate the new {@link android.graphics.drawable.Drawable} state for 9419 * this view. This is called by the view 9420 * system when the cached Drawable state is determined to be invalid. To 9421 * retrieve the current state, you should use {@link #getDrawableState}. 9422 * 9423 * @param extraSpace if non-zero, this is the number of extra entries you 9424 * would like in the returned array in which you can place your own 9425 * states. 9426 * 9427 * @return Returns an array holding the current {@link Drawable} state of 9428 * the view. 9429 * 9430 * @see #mergeDrawableStates 9431 */ 9432 protected int[] onCreateDrawableState(int extraSpace) { 9433 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 9434 mParent instanceof View) { 9435 return ((View) mParent).onCreateDrawableState(extraSpace); 9436 } 9437 9438 int[] drawableState; 9439 9440 int privateFlags = mPrivateFlags; 9441 9442 int viewStateIndex = 0; 9443 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 9444 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 9445 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 9446 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 9447 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 9448 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 9449 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested) { 9450 // This is set if HW acceleration is requested, even if the current 9451 // process doesn't allow it. This is just to allow app preview 9452 // windows to better match their app. 9453 viewStateIndex |= VIEW_STATE_ACCELERATED; 9454 } 9455 9456 drawableState = VIEW_STATE_SETS[viewStateIndex]; 9457 9458 //noinspection ConstantIfStatement 9459 if (false) { 9460 Log.i("View", "drawableStateIndex=" + viewStateIndex); 9461 Log.i("View", toString() 9462 + " pressed=" + ((privateFlags & PRESSED) != 0) 9463 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 9464 + " fo=" + hasFocus() 9465 + " sl=" + ((privateFlags & SELECTED) != 0) 9466 + " wf=" + hasWindowFocus() 9467 + ": " + Arrays.toString(drawableState)); 9468 } 9469 9470 if (extraSpace == 0) { 9471 return drawableState; 9472 } 9473 9474 final int[] fullState; 9475 if (drawableState != null) { 9476 fullState = new int[drawableState.length + extraSpace]; 9477 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 9478 } else { 9479 fullState = new int[extraSpace]; 9480 } 9481 9482 return fullState; 9483 } 9484 9485 /** 9486 * Merge your own state values in <var>additionalState</var> into the base 9487 * state values <var>baseState</var> that were returned by 9488 * {@link #onCreateDrawableState}. 9489 * 9490 * @param baseState The base state values returned by 9491 * {@link #onCreateDrawableState}, which will be modified to also hold your 9492 * own additional state values. 9493 * 9494 * @param additionalState The additional state values you would like 9495 * added to <var>baseState</var>; this array is not modified. 9496 * 9497 * @return As a convenience, the <var>baseState</var> array you originally 9498 * passed into the function is returned. 9499 * 9500 * @see #onCreateDrawableState 9501 */ 9502 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 9503 final int N = baseState.length; 9504 int i = N - 1; 9505 while (i >= 0 && baseState[i] == 0) { 9506 i--; 9507 } 9508 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 9509 return baseState; 9510 } 9511 9512 /** 9513 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 9514 * on all Drawable objects associated with this view. 9515 */ 9516 public void jumpDrawablesToCurrentState() { 9517 if (mBGDrawable != null) { 9518 mBGDrawable.jumpToCurrentState(); 9519 } 9520 } 9521 9522 /** 9523 * Sets the background color for this view. 9524 * @param color the color of the background 9525 */ 9526 @RemotableViewMethod 9527 public void setBackgroundColor(int color) { 9528 if (mBGDrawable instanceof ColorDrawable) { 9529 ((ColorDrawable) mBGDrawable).setColor(color); 9530 } else { 9531 setBackgroundDrawable(new ColorDrawable(color)); 9532 } 9533 } 9534 9535 /** 9536 * Set the background to a given resource. The resource should refer to 9537 * a Drawable object or 0 to remove the background. 9538 * @param resid The identifier of the resource. 9539 * @attr ref android.R.styleable#View_background 9540 */ 9541 @RemotableViewMethod 9542 public void setBackgroundResource(int resid) { 9543 if (resid != 0 && resid == mBackgroundResource) { 9544 return; 9545 } 9546 9547 Drawable d= null; 9548 if (resid != 0) { 9549 d = mResources.getDrawable(resid); 9550 } 9551 setBackgroundDrawable(d); 9552 9553 mBackgroundResource = resid; 9554 } 9555 9556 /** 9557 * Set the background to a given Drawable, or remove the background. If the 9558 * background has padding, this View's padding is set to the background's 9559 * padding. However, when a background is removed, this View's padding isn't 9560 * touched. If setting the padding is desired, please use 9561 * {@link #setPadding(int, int, int, int)}. 9562 * 9563 * @param d The Drawable to use as the background, or null to remove the 9564 * background 9565 */ 9566 public void setBackgroundDrawable(Drawable d) { 9567 boolean requestLayout = false; 9568 9569 mBackgroundResource = 0; 9570 9571 /* 9572 * Regardless of whether we're setting a new background or not, we want 9573 * to clear the previous drawable. 9574 */ 9575 if (mBGDrawable != null) { 9576 mBGDrawable.setCallback(null); 9577 unscheduleDrawable(mBGDrawable); 9578 } 9579 9580 if (d != null) { 9581 Rect padding = sThreadLocal.get(); 9582 if (padding == null) { 9583 padding = new Rect(); 9584 sThreadLocal.set(padding); 9585 } 9586 if (d.getPadding(padding)) { 9587 setPadding(padding.left, padding.top, padding.right, padding.bottom); 9588 } 9589 9590 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 9591 // if it has a different minimum size, we should layout again 9592 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 9593 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 9594 requestLayout = true; 9595 } 9596 9597 d.setCallback(this); 9598 if (d.isStateful()) { 9599 d.setState(getDrawableState()); 9600 } 9601 d.setVisible(getVisibility() == VISIBLE, false); 9602 mBGDrawable = d; 9603 9604 if ((mPrivateFlags & SKIP_DRAW) != 0) { 9605 mPrivateFlags &= ~SKIP_DRAW; 9606 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 9607 requestLayout = true; 9608 } 9609 } else { 9610 /* Remove the background */ 9611 mBGDrawable = null; 9612 9613 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 9614 /* 9615 * This view ONLY drew the background before and we're removing 9616 * the background, so now it won't draw anything 9617 * (hence we SKIP_DRAW) 9618 */ 9619 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 9620 mPrivateFlags |= SKIP_DRAW; 9621 } 9622 9623 /* 9624 * When the background is set, we try to apply its padding to this 9625 * View. When the background is removed, we don't touch this View's 9626 * padding. This is noted in the Javadocs. Hence, we don't need to 9627 * requestLayout(), the invalidate() below is sufficient. 9628 */ 9629 9630 // The old background's minimum size could have affected this 9631 // View's layout, so let's requestLayout 9632 requestLayout = true; 9633 } 9634 9635 computeOpaqueFlags(); 9636 9637 if (requestLayout) { 9638 requestLayout(); 9639 } 9640 9641 mBackgroundSizeChanged = true; 9642 invalidate(true); 9643 } 9644 9645 /** 9646 * Gets the background drawable 9647 * @return The drawable used as the background for this view, if any. 9648 */ 9649 public Drawable getBackground() { 9650 return mBGDrawable; 9651 } 9652 9653 /** 9654 * Sets the padding. The view may add on the space required to display 9655 * the scrollbars, depending on the style and visibility of the scrollbars. 9656 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 9657 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 9658 * from the values set in this call. 9659 * 9660 * @attr ref android.R.styleable#View_padding 9661 * @attr ref android.R.styleable#View_paddingBottom 9662 * @attr ref android.R.styleable#View_paddingLeft 9663 * @attr ref android.R.styleable#View_paddingRight 9664 * @attr ref android.R.styleable#View_paddingTop 9665 * @param left the left padding in pixels 9666 * @param top the top padding in pixels 9667 * @param right the right padding in pixels 9668 * @param bottom the bottom padding in pixels 9669 */ 9670 public void setPadding(int left, int top, int right, int bottom) { 9671 boolean changed = false; 9672 9673 mUserPaddingLeft = left; 9674 mUserPaddingRight = right; 9675 mUserPaddingBottom = bottom; 9676 9677 final int viewFlags = mViewFlags; 9678 9679 // Common case is there are no scroll bars. 9680 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 9681 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 9682 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 9683 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 9684 ? 0 : getVerticalScrollbarWidth(); 9685 switch (mVerticalScrollbarPosition) { 9686 case SCROLLBAR_POSITION_DEFAULT: 9687 case SCROLLBAR_POSITION_RIGHT: 9688 right += offset; 9689 break; 9690 case SCROLLBAR_POSITION_LEFT: 9691 left += offset; 9692 break; 9693 } 9694 } 9695 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 9696 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 9697 ? 0 : getHorizontalScrollbarHeight(); 9698 } 9699 } 9700 9701 if (mPaddingLeft != left) { 9702 changed = true; 9703 mPaddingLeft = left; 9704 } 9705 if (mPaddingTop != top) { 9706 changed = true; 9707 mPaddingTop = top; 9708 } 9709 if (mPaddingRight != right) { 9710 changed = true; 9711 mPaddingRight = right; 9712 } 9713 if (mPaddingBottom != bottom) { 9714 changed = true; 9715 mPaddingBottom = bottom; 9716 } 9717 9718 if (changed) { 9719 requestLayout(); 9720 } 9721 } 9722 9723 /** 9724 * Returns the top padding of this view. 9725 * 9726 * @return the top padding in pixels 9727 */ 9728 public int getPaddingTop() { 9729 return mPaddingTop; 9730 } 9731 9732 /** 9733 * Returns the bottom padding of this view. If there are inset and enabled 9734 * scrollbars, this value may include the space required to display the 9735 * scrollbars as well. 9736 * 9737 * @return the bottom padding in pixels 9738 */ 9739 public int getPaddingBottom() { 9740 return mPaddingBottom; 9741 } 9742 9743 /** 9744 * Returns the left padding of this view. If there are inset and enabled 9745 * scrollbars, this value may include the space required to display the 9746 * scrollbars as well. 9747 * 9748 * @return the left padding in pixels 9749 */ 9750 public int getPaddingLeft() { 9751 return mPaddingLeft; 9752 } 9753 9754 /** 9755 * Returns the right padding of this view. If there are inset and enabled 9756 * scrollbars, this value may include the space required to display the 9757 * scrollbars as well. 9758 * 9759 * @return the right padding in pixels 9760 */ 9761 public int getPaddingRight() { 9762 return mPaddingRight; 9763 } 9764 9765 /** 9766 * Changes the selection state of this view. A view can be selected or not. 9767 * Note that selection is not the same as focus. Views are typically 9768 * selected in the context of an AdapterView like ListView or GridView; 9769 * the selected view is the view that is highlighted. 9770 * 9771 * @param selected true if the view must be selected, false otherwise 9772 */ 9773 public void setSelected(boolean selected) { 9774 if (((mPrivateFlags & SELECTED) != 0) != selected) { 9775 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 9776 if (!selected) resetPressedState(); 9777 invalidate(true); 9778 refreshDrawableState(); 9779 dispatchSetSelected(selected); 9780 } 9781 } 9782 9783 /** 9784 * Dispatch setSelected to all of this View's children. 9785 * 9786 * @see #setSelected(boolean) 9787 * 9788 * @param selected The new selected state 9789 */ 9790 protected void dispatchSetSelected(boolean selected) { 9791 } 9792 9793 /** 9794 * Indicates the selection state of this view. 9795 * 9796 * @return true if the view is selected, false otherwise 9797 */ 9798 @ViewDebug.ExportedProperty 9799 public boolean isSelected() { 9800 return (mPrivateFlags & SELECTED) != 0; 9801 } 9802 9803 /** 9804 * Changes the activated state of this view. A view can be activated or not. 9805 * Note that activation is not the same as selection. Selection is 9806 * a transient property, representing the view (hierarchy) the user is 9807 * currently interacting with. Activation is a longer-term state that the 9808 * user can move views in and out of. For example, in a list view with 9809 * single or multiple selection enabled, the views in the current selection 9810 * set are activated. (Um, yeah, we are deeply sorry about the terminology 9811 * here.) The activated state is propagated down to children of the view it 9812 * is set on. 9813 * 9814 * @param activated true if the view must be activated, false otherwise 9815 */ 9816 public void setActivated(boolean activated) { 9817 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 9818 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 9819 invalidate(true); 9820 refreshDrawableState(); 9821 dispatchSetActivated(activated); 9822 } 9823 } 9824 9825 /** 9826 * Dispatch setActivated to all of this View's children. 9827 * 9828 * @see #setActivated(boolean) 9829 * 9830 * @param activated The new activated state 9831 */ 9832 protected void dispatchSetActivated(boolean activated) { 9833 } 9834 9835 /** 9836 * Indicates the activation state of this view. 9837 * 9838 * @return true if the view is activated, false otherwise 9839 */ 9840 @ViewDebug.ExportedProperty 9841 public boolean isActivated() { 9842 return (mPrivateFlags & ACTIVATED) != 0; 9843 } 9844 9845 /** 9846 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 9847 * observer can be used to get notifications when global events, like 9848 * layout, happen. 9849 * 9850 * The returned ViewTreeObserver observer is not guaranteed to remain 9851 * valid for the lifetime of this View. If the caller of this method keeps 9852 * a long-lived reference to ViewTreeObserver, it should always check for 9853 * the return value of {@link ViewTreeObserver#isAlive()}. 9854 * 9855 * @return The ViewTreeObserver for this view's hierarchy. 9856 */ 9857 public ViewTreeObserver getViewTreeObserver() { 9858 if (mAttachInfo != null) { 9859 return mAttachInfo.mTreeObserver; 9860 } 9861 if (mFloatingTreeObserver == null) { 9862 mFloatingTreeObserver = new ViewTreeObserver(); 9863 } 9864 return mFloatingTreeObserver; 9865 } 9866 9867 /** 9868 * <p>Finds the topmost view in the current view hierarchy.</p> 9869 * 9870 * @return the topmost view containing this view 9871 */ 9872 public View getRootView() { 9873 if (mAttachInfo != null) { 9874 final View v = mAttachInfo.mRootView; 9875 if (v != null) { 9876 return v; 9877 } 9878 } 9879 9880 View parent = this; 9881 9882 while (parent.mParent != null && parent.mParent instanceof View) { 9883 parent = (View) parent.mParent; 9884 } 9885 9886 return parent; 9887 } 9888 9889 /** 9890 * <p>Computes the coordinates of this view on the screen. The argument 9891 * must be an array of two integers. After the method returns, the array 9892 * contains the x and y location in that order.</p> 9893 * 9894 * @param location an array of two integers in which to hold the coordinates 9895 */ 9896 public void getLocationOnScreen(int[] location) { 9897 getLocationInWindow(location); 9898 9899 final AttachInfo info = mAttachInfo; 9900 if (info != null) { 9901 location[0] += info.mWindowLeft; 9902 location[1] += info.mWindowTop; 9903 } 9904 } 9905 9906 /** 9907 * <p>Computes the coordinates of this view in its window. The argument 9908 * must be an array of two integers. After the method returns, the array 9909 * contains the x and y location in that order.</p> 9910 * 9911 * @param location an array of two integers in which to hold the coordinates 9912 */ 9913 public void getLocationInWindow(int[] location) { 9914 if (location == null || location.length < 2) { 9915 throw new IllegalArgumentException("location must be an array of " 9916 + "two integers"); 9917 } 9918 9919 location[0] = mLeft + (int) (mTranslationX + 0.5f); 9920 location[1] = mTop + (int) (mTranslationY + 0.5f); 9921 9922 ViewParent viewParent = mParent; 9923 while (viewParent instanceof View) { 9924 final View view = (View)viewParent; 9925 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 9926 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 9927 viewParent = view.mParent; 9928 } 9929 9930 if (viewParent instanceof ViewRoot) { 9931 // *cough* 9932 final ViewRoot vr = (ViewRoot)viewParent; 9933 location[1] -= vr.mCurScrollY; 9934 } 9935 } 9936 9937 /** 9938 * {@hide} 9939 * @param id the id of the view to be found 9940 * @return the view of the specified id, null if cannot be found 9941 */ 9942 protected View findViewTraversal(int id) { 9943 if (id == mID) { 9944 return this; 9945 } 9946 return null; 9947 } 9948 9949 /** 9950 * {@hide} 9951 * @param tag the tag of the view to be found 9952 * @return the view of specified tag, null if cannot be found 9953 */ 9954 protected View findViewWithTagTraversal(Object tag) { 9955 if (tag != null && tag.equals(mTag)) { 9956 return this; 9957 } 9958 return null; 9959 } 9960 9961 /** 9962 * {@hide} 9963 * @param predicate The predicate to evaluate. 9964 * @return The first view that matches the predicate or null. 9965 */ 9966 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 9967 if (predicate.apply(this)) { 9968 return this; 9969 } 9970 return null; 9971 } 9972 9973 /** 9974 * Look for a child view with the given id. If this view has the given 9975 * id, return this view. 9976 * 9977 * @param id The id to search for. 9978 * @return The view that has the given id in the hierarchy or null 9979 */ 9980 public final View findViewById(int id) { 9981 if (id < 0) { 9982 return null; 9983 } 9984 return findViewTraversal(id); 9985 } 9986 9987 /** 9988 * Look for a child view with the given tag. If this view has the given 9989 * tag, return this view. 9990 * 9991 * @param tag The tag to search for, using "tag.equals(getTag())". 9992 * @return The View that has the given tag in the hierarchy or null 9993 */ 9994 public final View findViewWithTag(Object tag) { 9995 if (tag == null) { 9996 return null; 9997 } 9998 return findViewWithTagTraversal(tag); 9999 } 10000 10001 /** 10002 * {@hide} 10003 * Look for a child view that matches the specified predicate. 10004 * If this view matches the predicate, return this view. 10005 * 10006 * @param predicate The predicate to evaluate. 10007 * @return The first view that matches the predicate or null. 10008 */ 10009 public final View findViewByPredicate(Predicate<View> predicate) { 10010 return findViewByPredicateTraversal(predicate); 10011 } 10012 10013 /** 10014 * Sets the identifier for this view. The identifier does not have to be 10015 * unique in this view's hierarchy. The identifier should be a positive 10016 * number. 10017 * 10018 * @see #NO_ID 10019 * @see #getId 10020 * @see #findViewById 10021 * 10022 * @param id a number used to identify the view 10023 * 10024 * @attr ref android.R.styleable#View_id 10025 */ 10026 public void setId(int id) { 10027 mID = id; 10028 } 10029 10030 /** 10031 * {@hide} 10032 * 10033 * @param isRoot true if the view belongs to the root namespace, false 10034 * otherwise 10035 */ 10036 public void setIsRootNamespace(boolean isRoot) { 10037 if (isRoot) { 10038 mPrivateFlags |= IS_ROOT_NAMESPACE; 10039 } else { 10040 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 10041 } 10042 } 10043 10044 /** 10045 * {@hide} 10046 * 10047 * @return true if the view belongs to the root namespace, false otherwise 10048 */ 10049 public boolean isRootNamespace() { 10050 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 10051 } 10052 10053 /** 10054 * Returns this view's identifier. 10055 * 10056 * @return a positive integer used to identify the view or {@link #NO_ID} 10057 * if the view has no ID 10058 * 10059 * @see #setId 10060 * @see #findViewById 10061 * @attr ref android.R.styleable#View_id 10062 */ 10063 @ViewDebug.CapturedViewProperty 10064 public int getId() { 10065 return mID; 10066 } 10067 10068 /** 10069 * Returns this view's tag. 10070 * 10071 * @return the Object stored in this view as a tag 10072 * 10073 * @see #setTag(Object) 10074 * @see #getTag(int) 10075 */ 10076 @ViewDebug.ExportedProperty 10077 public Object getTag() { 10078 return mTag; 10079 } 10080 10081 /** 10082 * Sets the tag associated with this view. A tag can be used to mark 10083 * a view in its hierarchy and does not have to be unique within the 10084 * hierarchy. Tags can also be used to store data within a view without 10085 * resorting to another data structure. 10086 * 10087 * @param tag an Object to tag the view with 10088 * 10089 * @see #getTag() 10090 * @see #setTag(int, Object) 10091 */ 10092 public void setTag(final Object tag) { 10093 mTag = tag; 10094 } 10095 10096 /** 10097 * Returns the tag associated with this view and the specified key. 10098 * 10099 * @param key The key identifying the tag 10100 * 10101 * @return the Object stored in this view as a tag 10102 * 10103 * @see #setTag(int, Object) 10104 * @see #getTag() 10105 */ 10106 public Object getTag(int key) { 10107 SparseArray<Object> tags = null; 10108 synchronized (sTagsLock) { 10109 if (sTags != null) { 10110 tags = sTags.get(this); 10111 } 10112 } 10113 10114 if (tags != null) return tags.get(key); 10115 return null; 10116 } 10117 10118 /** 10119 * Sets a tag associated with this view and a key. A tag can be used 10120 * to mark a view in its hierarchy and does not have to be unique within 10121 * the hierarchy. Tags can also be used to store data within a view 10122 * without resorting to another data structure. 10123 * 10124 * The specified key should be an id declared in the resources of the 10125 * application to ensure it is unique (see the <a 10126 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 10127 * Keys identified as belonging to 10128 * the Android framework or not associated with any package will cause 10129 * an {@link IllegalArgumentException} to be thrown. 10130 * 10131 * @param key The key identifying the tag 10132 * @param tag An Object to tag the view with 10133 * 10134 * @throws IllegalArgumentException If they specified key is not valid 10135 * 10136 * @see #setTag(Object) 10137 * @see #getTag(int) 10138 */ 10139 public void setTag(int key, final Object tag) { 10140 // If the package id is 0x00 or 0x01, it's either an undefined package 10141 // or a framework id 10142 if ((key >>> 24) < 2) { 10143 throw new IllegalArgumentException("The key must be an application-specific " 10144 + "resource id."); 10145 } 10146 10147 setTagInternal(this, key, tag); 10148 } 10149 10150 /** 10151 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 10152 * framework id. 10153 * 10154 * @hide 10155 */ 10156 public void setTagInternal(int key, Object tag) { 10157 if ((key >>> 24) != 0x1) { 10158 throw new IllegalArgumentException("The key must be a framework-specific " 10159 + "resource id."); 10160 } 10161 10162 setTagInternal(this, key, tag); 10163 } 10164 10165 private static void setTagInternal(View view, int key, Object tag) { 10166 SparseArray<Object> tags = null; 10167 synchronized (sTagsLock) { 10168 if (sTags == null) { 10169 sTags = new WeakHashMap<View, SparseArray<Object>>(); 10170 } else { 10171 tags = sTags.get(view); 10172 } 10173 } 10174 10175 if (tags == null) { 10176 tags = new SparseArray<Object>(2); 10177 synchronized (sTagsLock) { 10178 sTags.put(view, tags); 10179 } 10180 } 10181 10182 tags.put(key, tag); 10183 } 10184 10185 /** 10186 * @param consistency The type of consistency. See ViewDebug for more information. 10187 * 10188 * @hide 10189 */ 10190 protected boolean dispatchConsistencyCheck(int consistency) { 10191 return onConsistencyCheck(consistency); 10192 } 10193 10194 /** 10195 * Method that subclasses should implement to check their consistency. The type of 10196 * consistency check is indicated by the bit field passed as a parameter. 10197 * 10198 * @param consistency The type of consistency. See ViewDebug for more information. 10199 * 10200 * @throws IllegalStateException if the view is in an inconsistent state. 10201 * 10202 * @hide 10203 */ 10204 protected boolean onConsistencyCheck(int consistency) { 10205 boolean result = true; 10206 10207 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 10208 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 10209 10210 if (checkLayout) { 10211 if (getParent() == null) { 10212 result = false; 10213 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10214 "View " + this + " does not have a parent."); 10215 } 10216 10217 if (mAttachInfo == null) { 10218 result = false; 10219 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10220 "View " + this + " is not attached to a window."); 10221 } 10222 } 10223 10224 if (checkDrawing) { 10225 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 10226 // from their draw() method 10227 10228 if ((mPrivateFlags & DRAWN) != DRAWN && 10229 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 10230 result = false; 10231 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10232 "View " + this + " was invalidated but its drawing cache is valid."); 10233 } 10234 } 10235 10236 return result; 10237 } 10238 10239 /** 10240 * Prints information about this view in the log output, with the tag 10241 * {@link #VIEW_LOG_TAG}. 10242 * 10243 * @hide 10244 */ 10245 public void debug() { 10246 debug(0); 10247 } 10248 10249 /** 10250 * Prints information about this view in the log output, with the tag 10251 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 10252 * indentation defined by the <code>depth</code>. 10253 * 10254 * @param depth the indentation level 10255 * 10256 * @hide 10257 */ 10258 protected void debug(int depth) { 10259 String output = debugIndent(depth - 1); 10260 10261 output += "+ " + this; 10262 int id = getId(); 10263 if (id != -1) { 10264 output += " (id=" + id + ")"; 10265 } 10266 Object tag = getTag(); 10267 if (tag != null) { 10268 output += " (tag=" + tag + ")"; 10269 } 10270 Log.d(VIEW_LOG_TAG, output); 10271 10272 if ((mPrivateFlags & FOCUSED) != 0) { 10273 output = debugIndent(depth) + " FOCUSED"; 10274 Log.d(VIEW_LOG_TAG, output); 10275 } 10276 10277 output = debugIndent(depth); 10278 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 10279 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 10280 + "} "; 10281 Log.d(VIEW_LOG_TAG, output); 10282 10283 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 10284 || mPaddingBottom != 0) { 10285 output = debugIndent(depth); 10286 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 10287 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 10288 Log.d(VIEW_LOG_TAG, output); 10289 } 10290 10291 output = debugIndent(depth); 10292 output += "mMeasureWidth=" + mMeasuredWidth + 10293 " mMeasureHeight=" + mMeasuredHeight; 10294 Log.d(VIEW_LOG_TAG, output); 10295 10296 output = debugIndent(depth); 10297 if (mLayoutParams == null) { 10298 output += "BAD! no layout params"; 10299 } else { 10300 output = mLayoutParams.debug(output); 10301 } 10302 Log.d(VIEW_LOG_TAG, output); 10303 10304 output = debugIndent(depth); 10305 output += "flags={"; 10306 output += View.printFlags(mViewFlags); 10307 output += "}"; 10308 Log.d(VIEW_LOG_TAG, output); 10309 10310 output = debugIndent(depth); 10311 output += "privateFlags={"; 10312 output += View.printPrivateFlags(mPrivateFlags); 10313 output += "}"; 10314 Log.d(VIEW_LOG_TAG, output); 10315 } 10316 10317 /** 10318 * Creates an string of whitespaces used for indentation. 10319 * 10320 * @param depth the indentation level 10321 * @return a String containing (depth * 2 + 3) * 2 white spaces 10322 * 10323 * @hide 10324 */ 10325 protected static String debugIndent(int depth) { 10326 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 10327 for (int i = 0; i < (depth * 2) + 3; i++) { 10328 spaces.append(' ').append(' '); 10329 } 10330 return spaces.toString(); 10331 } 10332 10333 /** 10334 * <p>Return the offset of the widget's text baseline from the widget's top 10335 * boundary. If this widget does not support baseline alignment, this 10336 * method returns -1. </p> 10337 * 10338 * @return the offset of the baseline within the widget's bounds or -1 10339 * if baseline alignment is not supported 10340 */ 10341 @ViewDebug.ExportedProperty(category = "layout") 10342 public int getBaseline() { 10343 return -1; 10344 } 10345 10346 /** 10347 * Call this when something has changed which has invalidated the 10348 * layout of this view. This will schedule a layout pass of the view 10349 * tree. 10350 */ 10351 public void requestLayout() { 10352 if (ViewDebug.TRACE_HIERARCHY) { 10353 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 10354 } 10355 10356 mPrivateFlags |= FORCE_LAYOUT; 10357 mPrivateFlags |= INVALIDATED; 10358 10359 if (mParent != null && !mParent.isLayoutRequested()) { 10360 mParent.requestLayout(); 10361 } 10362 } 10363 10364 /** 10365 * Forces this view to be laid out during the next layout pass. 10366 * This method does not call requestLayout() or forceLayout() 10367 * on the parent. 10368 */ 10369 public void forceLayout() { 10370 mPrivateFlags |= FORCE_LAYOUT; 10371 mPrivateFlags |= INVALIDATED; 10372 } 10373 10374 /** 10375 * <p> 10376 * This is called to find out how big a view should be. The parent 10377 * supplies constraint information in the width and height parameters. 10378 * </p> 10379 * 10380 * <p> 10381 * The actual mesurement work of a view is performed in 10382 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 10383 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 10384 * </p> 10385 * 10386 * 10387 * @param widthMeasureSpec Horizontal space requirements as imposed by the 10388 * parent 10389 * @param heightMeasureSpec Vertical space requirements as imposed by the 10390 * parent 10391 * 10392 * @see #onMeasure(int, int) 10393 */ 10394 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 10395 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 10396 widthMeasureSpec != mOldWidthMeasureSpec || 10397 heightMeasureSpec != mOldHeightMeasureSpec) { 10398 10399 // first clears the measured dimension flag 10400 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 10401 10402 if (ViewDebug.TRACE_HIERARCHY) { 10403 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 10404 } 10405 10406 // measure ourselves, this should set the measured dimension flag back 10407 onMeasure(widthMeasureSpec, heightMeasureSpec); 10408 10409 // flag not set, setMeasuredDimension() was not invoked, we raise 10410 // an exception to warn the developer 10411 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 10412 throw new IllegalStateException("onMeasure() did not set the" 10413 + " measured dimension by calling" 10414 + " setMeasuredDimension()"); 10415 } 10416 10417 mPrivateFlags |= LAYOUT_REQUIRED; 10418 } 10419 10420 mOldWidthMeasureSpec = widthMeasureSpec; 10421 mOldHeightMeasureSpec = heightMeasureSpec; 10422 } 10423 10424 /** 10425 * <p> 10426 * Measure the view and its content to determine the measured width and the 10427 * measured height. This method is invoked by {@link #measure(int, int)} and 10428 * should be overriden by subclasses to provide accurate and efficient 10429 * measurement of their contents. 10430 * </p> 10431 * 10432 * <p> 10433 * <strong>CONTRACT:</strong> When overriding this method, you 10434 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 10435 * measured width and height of this view. Failure to do so will trigger an 10436 * <code>IllegalStateException</code>, thrown by 10437 * {@link #measure(int, int)}. Calling the superclass' 10438 * {@link #onMeasure(int, int)} is a valid use. 10439 * </p> 10440 * 10441 * <p> 10442 * The base class implementation of measure defaults to the background size, 10443 * unless a larger size is allowed by the MeasureSpec. Subclasses should 10444 * override {@link #onMeasure(int, int)} to provide better measurements of 10445 * their content. 10446 * </p> 10447 * 10448 * <p> 10449 * If this method is overridden, it is the subclass's responsibility to make 10450 * sure the measured height and width are at least the view's minimum height 10451 * and width ({@link #getSuggestedMinimumHeight()} and 10452 * {@link #getSuggestedMinimumWidth()}). 10453 * </p> 10454 * 10455 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 10456 * The requirements are encoded with 10457 * {@link android.view.View.MeasureSpec}. 10458 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 10459 * The requirements are encoded with 10460 * {@link android.view.View.MeasureSpec}. 10461 * 10462 * @see #getMeasuredWidth() 10463 * @see #getMeasuredHeight() 10464 * @see #setMeasuredDimension(int, int) 10465 * @see #getSuggestedMinimumHeight() 10466 * @see #getSuggestedMinimumWidth() 10467 * @see android.view.View.MeasureSpec#getMode(int) 10468 * @see android.view.View.MeasureSpec#getSize(int) 10469 */ 10470 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 10471 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 10472 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 10473 } 10474 10475 /** 10476 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 10477 * measured width and measured height. Failing to do so will trigger an 10478 * exception at measurement time.</p> 10479 * 10480 * @param measuredWidth The measured width of this view. May be a complex 10481 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10482 * {@link #MEASURED_STATE_TOO_SMALL}. 10483 * @param measuredHeight The measured height of this view. May be a complex 10484 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10485 * {@link #MEASURED_STATE_TOO_SMALL}. 10486 */ 10487 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 10488 mMeasuredWidth = measuredWidth; 10489 mMeasuredHeight = measuredHeight; 10490 10491 mPrivateFlags |= MEASURED_DIMENSION_SET; 10492 } 10493 10494 /** 10495 * Merge two states as returned by {@link #getMeasuredState()}. 10496 * @param curState The current state as returned from a view or the result 10497 * of combining multiple views. 10498 * @param newState The new view state to combine. 10499 * @return Returns a new integer reflecting the combination of the two 10500 * states. 10501 */ 10502 public static int combineMeasuredStates(int curState, int newState) { 10503 return curState | newState; 10504 } 10505 10506 /** 10507 * Version of {@link #resolveSizeAndState(int, int, int)} 10508 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 10509 */ 10510 public static int resolveSize(int size, int measureSpec) { 10511 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 10512 } 10513 10514 /** 10515 * Utility to reconcile a desired size and state, with constraints imposed 10516 * by a MeasureSpec. Will take the desired size, unless a different size 10517 * is imposed by the constraints. The returned value is a compound integer, 10518 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 10519 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 10520 * size is smaller than the size the view wants to be. 10521 * 10522 * @param size How big the view wants to be 10523 * @param measureSpec Constraints imposed by the parent 10524 * @return Size information bit mask as defined by 10525 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 10526 */ 10527 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 10528 int result = size; 10529 int specMode = MeasureSpec.getMode(measureSpec); 10530 int specSize = MeasureSpec.getSize(measureSpec); 10531 switch (specMode) { 10532 case MeasureSpec.UNSPECIFIED: 10533 result = size; 10534 break; 10535 case MeasureSpec.AT_MOST: 10536 if (specSize < size) { 10537 result = specSize | MEASURED_STATE_TOO_SMALL; 10538 } else { 10539 result = size; 10540 } 10541 break; 10542 case MeasureSpec.EXACTLY: 10543 result = specSize; 10544 break; 10545 } 10546 return result | (childMeasuredState&MEASURED_STATE_MASK); 10547 } 10548 10549 /** 10550 * Utility to return a default size. Uses the supplied size if the 10551 * MeasureSpec imposed no contraints. Will get larger if allowed 10552 * by the MeasureSpec. 10553 * 10554 * @param size Default size for this view 10555 * @param measureSpec Constraints imposed by the parent 10556 * @return The size this view should be. 10557 */ 10558 public static int getDefaultSize(int size, int measureSpec) { 10559 int result = size; 10560 int specMode = MeasureSpec.getMode(measureSpec); 10561 int specSize = MeasureSpec.getSize(measureSpec); 10562 10563 switch (specMode) { 10564 case MeasureSpec.UNSPECIFIED: 10565 result = size; 10566 break; 10567 case MeasureSpec.AT_MOST: 10568 case MeasureSpec.EXACTLY: 10569 result = specSize; 10570 break; 10571 } 10572 return result; 10573 } 10574 10575 /** 10576 * Returns the suggested minimum height that the view should use. This 10577 * returns the maximum of the view's minimum height 10578 * and the background's minimum height 10579 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 10580 * <p> 10581 * When being used in {@link #onMeasure(int, int)}, the caller should still 10582 * ensure the returned height is within the requirements of the parent. 10583 * 10584 * @return The suggested minimum height of the view. 10585 */ 10586 protected int getSuggestedMinimumHeight() { 10587 int suggestedMinHeight = mMinHeight; 10588 10589 if (mBGDrawable != null) { 10590 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 10591 if (suggestedMinHeight < bgMinHeight) { 10592 suggestedMinHeight = bgMinHeight; 10593 } 10594 } 10595 10596 return suggestedMinHeight; 10597 } 10598 10599 /** 10600 * Returns the suggested minimum width that the view should use. This 10601 * returns the maximum of the view's minimum width) 10602 * and the background's minimum width 10603 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 10604 * <p> 10605 * When being used in {@link #onMeasure(int, int)}, the caller should still 10606 * ensure the returned width is within the requirements of the parent. 10607 * 10608 * @return The suggested minimum width of the view. 10609 */ 10610 protected int getSuggestedMinimumWidth() { 10611 int suggestedMinWidth = mMinWidth; 10612 10613 if (mBGDrawable != null) { 10614 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 10615 if (suggestedMinWidth < bgMinWidth) { 10616 suggestedMinWidth = bgMinWidth; 10617 } 10618 } 10619 10620 return suggestedMinWidth; 10621 } 10622 10623 /** 10624 * Sets the minimum height of the view. It is not guaranteed the view will 10625 * be able to achieve this minimum height (for example, if its parent layout 10626 * constrains it with less available height). 10627 * 10628 * @param minHeight The minimum height the view will try to be. 10629 */ 10630 public void setMinimumHeight(int minHeight) { 10631 mMinHeight = minHeight; 10632 } 10633 10634 /** 10635 * Sets the minimum width of the view. It is not guaranteed the view will 10636 * be able to achieve this minimum width (for example, if its parent layout 10637 * constrains it with less available width). 10638 * 10639 * @param minWidth The minimum width the view will try to be. 10640 */ 10641 public void setMinimumWidth(int minWidth) { 10642 mMinWidth = minWidth; 10643 } 10644 10645 /** 10646 * Get the animation currently associated with this view. 10647 * 10648 * @return The animation that is currently playing or 10649 * scheduled to play for this view. 10650 */ 10651 public Animation getAnimation() { 10652 return mCurrentAnimation; 10653 } 10654 10655 /** 10656 * Start the specified animation now. 10657 * 10658 * @param animation the animation to start now 10659 */ 10660 public void startAnimation(Animation animation) { 10661 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 10662 setAnimation(animation); 10663 invalidateParentCaches(); 10664 invalidate(true); 10665 } 10666 10667 /** 10668 * Cancels any animations for this view. 10669 */ 10670 public void clearAnimation() { 10671 if (mCurrentAnimation != null) { 10672 mCurrentAnimation.detach(); 10673 } 10674 mCurrentAnimation = null; 10675 invalidateParentIfNeeded(); 10676 } 10677 10678 /** 10679 * Sets the next animation to play for this view. 10680 * If you want the animation to play immediately, use 10681 * startAnimation. This method provides allows fine-grained 10682 * control over the start time and invalidation, but you 10683 * must make sure that 1) the animation has a start time set, and 10684 * 2) the view will be invalidated when the animation is supposed to 10685 * start. 10686 * 10687 * @param animation The next animation, or null. 10688 */ 10689 public void setAnimation(Animation animation) { 10690 mCurrentAnimation = animation; 10691 if (animation != null) { 10692 animation.reset(); 10693 } 10694 } 10695 10696 /** 10697 * Invoked by a parent ViewGroup to notify the start of the animation 10698 * currently associated with this view. If you override this method, 10699 * always call super.onAnimationStart(); 10700 * 10701 * @see #setAnimation(android.view.animation.Animation) 10702 * @see #getAnimation() 10703 */ 10704 protected void onAnimationStart() { 10705 mPrivateFlags |= ANIMATION_STARTED; 10706 } 10707 10708 /** 10709 * Invoked by a parent ViewGroup to notify the end of the animation 10710 * currently associated with this view. If you override this method, 10711 * always call super.onAnimationEnd(); 10712 * 10713 * @see #setAnimation(android.view.animation.Animation) 10714 * @see #getAnimation() 10715 */ 10716 protected void onAnimationEnd() { 10717 mPrivateFlags &= ~ANIMATION_STARTED; 10718 } 10719 10720 /** 10721 * Invoked if there is a Transform that involves alpha. Subclass that can 10722 * draw themselves with the specified alpha should return true, and then 10723 * respect that alpha when their onDraw() is called. If this returns false 10724 * then the view may be redirected to draw into an offscreen buffer to 10725 * fulfill the request, which will look fine, but may be slower than if the 10726 * subclass handles it internally. The default implementation returns false. 10727 * 10728 * @param alpha The alpha (0..255) to apply to the view's drawing 10729 * @return true if the view can draw with the specified alpha. 10730 */ 10731 protected boolean onSetAlpha(int alpha) { 10732 return false; 10733 } 10734 10735 /** 10736 * This is used by the RootView to perform an optimization when 10737 * the view hierarchy contains one or several SurfaceView. 10738 * SurfaceView is always considered transparent, but its children are not, 10739 * therefore all View objects remove themselves from the global transparent 10740 * region (passed as a parameter to this function). 10741 * 10742 * @param region The transparent region for this ViewRoot (window). 10743 * 10744 * @return Returns true if the effective visibility of the view at this 10745 * point is opaque, regardless of the transparent region; returns false 10746 * if it is possible for underlying windows to be seen behind the view. 10747 * 10748 * {@hide} 10749 */ 10750 public boolean gatherTransparentRegion(Region region) { 10751 final AttachInfo attachInfo = mAttachInfo; 10752 if (region != null && attachInfo != null) { 10753 final int pflags = mPrivateFlags; 10754 if ((pflags & SKIP_DRAW) == 0) { 10755 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 10756 // remove it from the transparent region. 10757 final int[] location = attachInfo.mTransparentLocation; 10758 getLocationInWindow(location); 10759 region.op(location[0], location[1], location[0] + mRight - mLeft, 10760 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 10761 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 10762 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 10763 // exists, so we remove the background drawable's non-transparent 10764 // parts from this transparent region. 10765 applyDrawableToTransparentRegion(mBGDrawable, region); 10766 } 10767 } 10768 return true; 10769 } 10770 10771 /** 10772 * Play a sound effect for this view. 10773 * 10774 * <p>The framework will play sound effects for some built in actions, such as 10775 * clicking, but you may wish to play these effects in your widget, 10776 * for instance, for internal navigation. 10777 * 10778 * <p>The sound effect will only be played if sound effects are enabled by the user, and 10779 * {@link #isSoundEffectsEnabled()} is true. 10780 * 10781 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 10782 */ 10783 public void playSoundEffect(int soundConstant) { 10784 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 10785 return; 10786 } 10787 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 10788 } 10789 10790 /** 10791 * BZZZTT!!1! 10792 * 10793 * <p>Provide haptic feedback to the user for this view. 10794 * 10795 * <p>The framework will provide haptic feedback for some built in actions, 10796 * such as long presses, but you may wish to provide feedback for your 10797 * own widget. 10798 * 10799 * <p>The feedback will only be performed if 10800 * {@link #isHapticFeedbackEnabled()} is true. 10801 * 10802 * @param feedbackConstant One of the constants defined in 10803 * {@link HapticFeedbackConstants} 10804 */ 10805 public boolean performHapticFeedback(int feedbackConstant) { 10806 return performHapticFeedback(feedbackConstant, 0); 10807 } 10808 10809 /** 10810 * BZZZTT!!1! 10811 * 10812 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 10813 * 10814 * @param feedbackConstant One of the constants defined in 10815 * {@link HapticFeedbackConstants} 10816 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 10817 */ 10818 public boolean performHapticFeedback(int feedbackConstant, int flags) { 10819 if (mAttachInfo == null) { 10820 return false; 10821 } 10822 //noinspection SimplifiableIfStatement 10823 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 10824 && !isHapticFeedbackEnabled()) { 10825 return false; 10826 } 10827 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 10828 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 10829 } 10830 10831 /** 10832 * Request that the visibility of the status bar be changed. 10833 */ 10834 public void setSystemUiVisibility(int visibility) { 10835 if (visibility != mSystemUiVisibility) { 10836 mSystemUiVisibility = visibility; 10837 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 10838 mParent.recomputeViewAttributes(this); 10839 } 10840 } 10841 } 10842 10843 /** 10844 * Returns the status bar visibility that this view has requested. 10845 */ 10846 public int getSystemUiVisibility() { 10847 return mSystemUiVisibility; 10848 } 10849 10850 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 10851 mOnSystemUiVisibilityChangeListener = l; 10852 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 10853 mParent.recomputeViewAttributes(this); 10854 } 10855 } 10856 10857 /** 10858 */ 10859 public void dispatchSystemUiVisibilityChanged(int visibility) { 10860 mSystemUiVisibility = visibility; 10861 if (mOnSystemUiVisibilityChangeListener != null) { 10862 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange(visibility); 10863 } 10864 } 10865 10866 /** 10867 * !!! TODO: real docs 10868 * 10869 * The base class implementation makes the shadow the same size and appearance 10870 * as the view itself, and positions it with its center at the touch point. 10871 */ 10872 public static class DragShadowBuilder { 10873 private final WeakReference<View> mView; 10874 10875 /** 10876 * Construct a shadow builder object for use with the given View object. The 10877 * default implementation will construct a drag shadow the same size and 10878 * appearance as the supplied View. 10879 * 10880 * @param view A view within the application's layout whose appearance 10881 * should be replicated as the drag shadow. 10882 */ 10883 public DragShadowBuilder(View view) { 10884 mView = new WeakReference<View>(view); 10885 } 10886 10887 /** 10888 * Construct a shadow builder object with no associated View. This 10889 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 10890 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 10891 * to supply the drag shadow's dimensions and appearance without 10892 * reference to any View object. 10893 */ 10894 public DragShadowBuilder() { 10895 mView = new WeakReference<View>(null); 10896 } 10897 10898 /** 10899 * Returns the View object that had been passed to the 10900 * {@link #View.DragShadowBuilder(View)} 10901 * constructor. If that View parameter was {@code null} or if the 10902 * {@link #View.DragShadowBuilder()} 10903 * constructor was used to instantiate the builder object, this method will return 10904 * null. 10905 * 10906 * @return The View object associate with this builder object. 10907 */ 10908 final public View getView() { 10909 return mView.get(); 10910 } 10911 10912 /** 10913 * Provide the draggable-shadow metrics for the operation: the dimensions of 10914 * the shadow image itself, and the point within that shadow that should 10915 * be centered under the touch location while dragging. 10916 * <p> 10917 * The default implementation sets the dimensions of the shadow to be the 10918 * same as the dimensions of the View object that had been supplied to the 10919 * {@link #View.DragShadowBuilder(View)} constructor 10920 * when the builder object was instantiated, and centers the shadow under the touch 10921 * point. 10922 * 10923 * @param shadowSize The application should set the {@code x} member of this 10924 * parameter to the desired shadow width, and the {@code y} member to 10925 * the desired height. 10926 * @param shadowTouchPoint The application should set this point to be the 10927 * location within the shadow that should track directly underneath 10928 * the touch point on the screen during a drag. 10929 */ 10930 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 10931 final View view = mView.get(); 10932 if (view != null) { 10933 shadowSize.set(view.getWidth(), view.getHeight()); 10934 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 10935 } else { 10936 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 10937 } 10938 } 10939 10940 /** 10941 * Draw the shadow image for the upcoming drag. The shadow canvas was 10942 * created with the dimensions supplied by the 10943 * {@link #onProvideShadowMetrics(Point, Point)} callback. 10944 * <p> 10945 * The default implementation replicates the appearance of the View object 10946 * that had been supplied to the 10947 * {@link #View.DragShadowBuilder(View)} 10948 * constructor when the builder object was instantiated. 10949 * 10950 * @param canvas 10951 */ 10952 public void onDrawShadow(Canvas canvas) { 10953 final View view = mView.get(); 10954 if (view != null) { 10955 view.draw(canvas); 10956 } else { 10957 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 10958 } 10959 } 10960 } 10961 10962 /** 10963 * Drag and drop. App calls startDrag(), then callbacks to the shadow builder's 10964 * {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} and 10965 * {@link DragShadowBuilder#onDrawShadow(Canvas)} methods happen, then the drag 10966 * operation is handed over to the OS. 10967 * !!! TODO: real docs 10968 * 10969 * @param data !!! TODO 10970 * @param shadowBuilder !!! TODO 10971 * @param myLocalState An arbitrary object that will be passed as part of every DragEvent 10972 * delivered to the calling application during the course of the current drag operation. 10973 * This object is private to the application that called startDrag(), and is not 10974 * visible to other applications. It provides a lightweight way for the application to 10975 * propagate information from the initiator to the recipient of a drag within its own 10976 * application; for example, to help disambiguate between 'copy' and 'move' semantics. 10977 * @param flags Flags affecting the drag operation. At present no flags are defined; 10978 * pass 0 for this parameter. 10979 * @return {@code true} if the drag operation was initiated successfully; {@code false} if 10980 * an error prevented the drag from taking place. 10981 */ 10982 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 10983 Object myLocalState, int flags) { 10984 if (ViewDebug.DEBUG_DRAG) { 10985 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 10986 } 10987 boolean okay = false; 10988 10989 Point shadowSize = new Point(); 10990 Point shadowTouchPoint = new Point(); 10991 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 10992 10993 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 10994 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 10995 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 10996 } 10997 10998 if (ViewDebug.DEBUG_DRAG) { 10999 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 11000 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 11001 } 11002 Surface surface = new Surface(); 11003 try { 11004 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 11005 flags, shadowSize.x, shadowSize.y, surface); 11006 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 11007 + " surface=" + surface); 11008 if (token != null) { 11009 Canvas canvas = surface.lockCanvas(null); 11010 try { 11011 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 11012 shadowBuilder.onDrawShadow(canvas); 11013 } finally { 11014 surface.unlockCanvasAndPost(canvas); 11015 } 11016 11017 final ViewRoot root = getViewRoot(); 11018 11019 // Cache the local state object for delivery with DragEvents 11020 root.setLocalDragState(myLocalState); 11021 11022 // repurpose 'shadowSize' for the last touch point 11023 root.getLastTouchPoint(shadowSize); 11024 11025 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 11026 shadowSize.x, shadowSize.y, 11027 shadowTouchPoint.x, shadowTouchPoint.y, data); 11028 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 11029 } 11030 } catch (Exception e) { 11031 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 11032 surface.destroy(); 11033 } 11034 11035 return okay; 11036 } 11037 11038 /** 11039 * Drag-and-drop event dispatch. The event.getAction() verb is one of the DragEvent 11040 * constants DRAG_STARTED_EVENT, DRAG_EVENT, DROP_EVENT, and DRAG_ENDED_EVENT. 11041 * 11042 * For DRAG_STARTED_EVENT, event.getClipDescription() describes the content 11043 * being dragged. onDragEvent() should return 'true' if the view can handle 11044 * a drop of that content. A view that returns 'false' here will receive no 11045 * further calls to onDragEvent() about the drag/drop operation. 11046 * 11047 * For DRAG_ENTERED, event.getClipDescription() describes the content being 11048 * dragged. This will be the same content description passed in the 11049 * DRAG_STARTED_EVENT invocation. 11050 * 11051 * For DRAG_EXITED, event.getClipDescription() describes the content being 11052 * dragged. This will be the same content description passed in the 11053 * DRAG_STARTED_EVENT invocation. The view should return to its approriate 11054 * drag-acceptance visual state. 11055 * 11056 * For DRAG_LOCATION_EVENT, event.getX() and event.getY() give the location in View 11057 * coordinates of the current drag point. The view must return 'true' if it 11058 * can accept a drop of the current drag content, false otherwise. 11059 * 11060 * For DROP_EVENT, event.getX() and event.getY() give the location of the drop 11061 * within the view; also, event.getClipData() returns the full data payload 11062 * being dropped. The view should return 'true' if it consumed the dropped 11063 * content, 'false' if it did not. 11064 * 11065 * For DRAG_ENDED_EVENT, the 'event' argument may be null. The view should return 11066 * to its normal visual state. 11067 */ 11068 public boolean onDragEvent(DragEvent event) { 11069 return false; 11070 } 11071 11072 /** 11073 * Views typically don't need to override dispatchDragEvent(); it just calls 11074 * onDragEvent(event) and passes the result up appropriately. 11075 */ 11076 public boolean dispatchDragEvent(DragEvent event) { 11077 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 11078 && mOnDragListener.onDrag(this, event)) { 11079 return true; 11080 } 11081 return onDragEvent(event); 11082 } 11083 11084 /** 11085 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 11086 * it is ever exposed at all. 11087 * @hide 11088 */ 11089 public void onCloseSystemDialogs(String reason) { 11090 } 11091 11092 /** 11093 * Given a Drawable whose bounds have been set to draw into this view, 11094 * update a Region being computed for {@link #gatherTransparentRegion} so 11095 * that any non-transparent parts of the Drawable are removed from the 11096 * given transparent region. 11097 * 11098 * @param dr The Drawable whose transparency is to be applied to the region. 11099 * @param region A Region holding the current transparency information, 11100 * where any parts of the region that are set are considered to be 11101 * transparent. On return, this region will be modified to have the 11102 * transparency information reduced by the corresponding parts of the 11103 * Drawable that are not transparent. 11104 * {@hide} 11105 */ 11106 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 11107 if (DBG) { 11108 Log.i("View", "Getting transparent region for: " + this); 11109 } 11110 final Region r = dr.getTransparentRegion(); 11111 final Rect db = dr.getBounds(); 11112 final AttachInfo attachInfo = mAttachInfo; 11113 if (r != null && attachInfo != null) { 11114 final int w = getRight()-getLeft(); 11115 final int h = getBottom()-getTop(); 11116 if (db.left > 0) { 11117 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 11118 r.op(0, 0, db.left, h, Region.Op.UNION); 11119 } 11120 if (db.right < w) { 11121 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 11122 r.op(db.right, 0, w, h, Region.Op.UNION); 11123 } 11124 if (db.top > 0) { 11125 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 11126 r.op(0, 0, w, db.top, Region.Op.UNION); 11127 } 11128 if (db.bottom < h) { 11129 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 11130 r.op(0, db.bottom, w, h, Region.Op.UNION); 11131 } 11132 final int[] location = attachInfo.mTransparentLocation; 11133 getLocationInWindow(location); 11134 r.translate(location[0], location[1]); 11135 region.op(r, Region.Op.INTERSECT); 11136 } else { 11137 region.op(db, Region.Op.DIFFERENCE); 11138 } 11139 } 11140 11141 private void postCheckForLongClick(int delayOffset) { 11142 mHasPerformedLongPress = false; 11143 11144 if (mPendingCheckForLongPress == null) { 11145 mPendingCheckForLongPress = new CheckForLongPress(); 11146 } 11147 mPendingCheckForLongPress.rememberWindowAttachCount(); 11148 postDelayed(mPendingCheckForLongPress, 11149 ViewConfiguration.getLongPressTimeout() - delayOffset); 11150 } 11151 11152 /** 11153 * Inflate a view from an XML resource. This convenience method wraps the {@link 11154 * LayoutInflater} class, which provides a full range of options for view inflation. 11155 * 11156 * @param context The Context object for your activity or application. 11157 * @param resource The resource ID to inflate 11158 * @param root A view group that will be the parent. Used to properly inflate the 11159 * layout_* parameters. 11160 * @see LayoutInflater 11161 */ 11162 public static View inflate(Context context, int resource, ViewGroup root) { 11163 LayoutInflater factory = LayoutInflater.from(context); 11164 return factory.inflate(resource, root); 11165 } 11166 11167 /** 11168 * Scroll the view with standard behavior for scrolling beyond the normal 11169 * content boundaries. Views that call this method should override 11170 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 11171 * results of an over-scroll operation. 11172 * 11173 * Views can use this method to handle any touch or fling-based scrolling. 11174 * 11175 * @param deltaX Change in X in pixels 11176 * @param deltaY Change in Y in pixels 11177 * @param scrollX Current X scroll value in pixels before applying deltaX 11178 * @param scrollY Current Y scroll value in pixels before applying deltaY 11179 * @param scrollRangeX Maximum content scroll range along the X axis 11180 * @param scrollRangeY Maximum content scroll range along the Y axis 11181 * @param maxOverScrollX Number of pixels to overscroll by in either direction 11182 * along the X axis. 11183 * @param maxOverScrollY Number of pixels to overscroll by in either direction 11184 * along the Y axis. 11185 * @param isTouchEvent true if this scroll operation is the result of a touch event. 11186 * @return true if scrolling was clamped to an over-scroll boundary along either 11187 * axis, false otherwise. 11188 */ 11189 protected boolean overScrollBy(int deltaX, int deltaY, 11190 int scrollX, int scrollY, 11191 int scrollRangeX, int scrollRangeY, 11192 int maxOverScrollX, int maxOverScrollY, 11193 boolean isTouchEvent) { 11194 final int overScrollMode = mOverScrollMode; 11195 final boolean canScrollHorizontal = 11196 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 11197 final boolean canScrollVertical = 11198 computeVerticalScrollRange() > computeVerticalScrollExtent(); 11199 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 11200 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 11201 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 11202 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 11203 11204 int newScrollX = scrollX + deltaX; 11205 if (!overScrollHorizontal) { 11206 maxOverScrollX = 0; 11207 } 11208 11209 int newScrollY = scrollY + deltaY; 11210 if (!overScrollVertical) { 11211 maxOverScrollY = 0; 11212 } 11213 11214 // Clamp values if at the limits and record 11215 final int left = -maxOverScrollX; 11216 final int right = maxOverScrollX + scrollRangeX; 11217 final int top = -maxOverScrollY; 11218 final int bottom = maxOverScrollY + scrollRangeY; 11219 11220 boolean clampedX = false; 11221 if (newScrollX > right) { 11222 newScrollX = right; 11223 clampedX = true; 11224 } else if (newScrollX < left) { 11225 newScrollX = left; 11226 clampedX = true; 11227 } 11228 11229 boolean clampedY = false; 11230 if (newScrollY > bottom) { 11231 newScrollY = bottom; 11232 clampedY = true; 11233 } else if (newScrollY < top) { 11234 newScrollY = top; 11235 clampedY = true; 11236 } 11237 11238 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 11239 11240 return clampedX || clampedY; 11241 } 11242 11243 /** 11244 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 11245 * respond to the results of an over-scroll operation. 11246 * 11247 * @param scrollX New X scroll value in pixels 11248 * @param scrollY New Y scroll value in pixels 11249 * @param clampedX True if scrollX was clamped to an over-scroll boundary 11250 * @param clampedY True if scrollY was clamped to an over-scroll boundary 11251 */ 11252 protected void onOverScrolled(int scrollX, int scrollY, 11253 boolean clampedX, boolean clampedY) { 11254 // Intentionally empty. 11255 } 11256 11257 /** 11258 * Returns the over-scroll mode for this view. The result will be 11259 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11260 * (allow over-scrolling only if the view content is larger than the container), 11261 * or {@link #OVER_SCROLL_NEVER}. 11262 * 11263 * @return This view's over-scroll mode. 11264 */ 11265 public int getOverScrollMode() { 11266 return mOverScrollMode; 11267 } 11268 11269 /** 11270 * Set the over-scroll mode for this view. Valid over-scroll modes are 11271 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11272 * (allow over-scrolling only if the view content is larger than the container), 11273 * or {@link #OVER_SCROLL_NEVER}. 11274 * 11275 * Setting the over-scroll mode of a view will have an effect only if the 11276 * view is capable of scrolling. 11277 * 11278 * @param overScrollMode The new over-scroll mode for this view. 11279 */ 11280 public void setOverScrollMode(int overScrollMode) { 11281 if (overScrollMode != OVER_SCROLL_ALWAYS && 11282 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 11283 overScrollMode != OVER_SCROLL_NEVER) { 11284 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 11285 } 11286 mOverScrollMode = overScrollMode; 11287 } 11288 11289 /** 11290 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 11291 * Each MeasureSpec represents a requirement for either the width or the height. 11292 * A MeasureSpec is comprised of a size and a mode. There are three possible 11293 * modes: 11294 * <dl> 11295 * <dt>UNSPECIFIED</dt> 11296 * <dd> 11297 * The parent has not imposed any constraint on the child. It can be whatever size 11298 * it wants. 11299 * </dd> 11300 * 11301 * <dt>EXACTLY</dt> 11302 * <dd> 11303 * The parent has determined an exact size for the child. The child is going to be 11304 * given those bounds regardless of how big it wants to be. 11305 * </dd> 11306 * 11307 * <dt>AT_MOST</dt> 11308 * <dd> 11309 * The child can be as large as it wants up to the specified size. 11310 * </dd> 11311 * </dl> 11312 * 11313 * MeasureSpecs are implemented as ints to reduce object allocation. This class 11314 * is provided to pack and unpack the <size, mode> tuple into the int. 11315 */ 11316 public static class MeasureSpec { 11317 private static final int MODE_SHIFT = 30; 11318 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 11319 11320 /** 11321 * Measure specification mode: The parent has not imposed any constraint 11322 * on the child. It can be whatever size it wants. 11323 */ 11324 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 11325 11326 /** 11327 * Measure specification mode: The parent has determined an exact size 11328 * for the child. The child is going to be given those bounds regardless 11329 * of how big it wants to be. 11330 */ 11331 public static final int EXACTLY = 1 << MODE_SHIFT; 11332 11333 /** 11334 * Measure specification mode: The child can be as large as it wants up 11335 * to the specified size. 11336 */ 11337 public static final int AT_MOST = 2 << MODE_SHIFT; 11338 11339 /** 11340 * Creates a measure specification based on the supplied size and mode. 11341 * 11342 * The mode must always be one of the following: 11343 * <ul> 11344 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 11345 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 11346 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 11347 * </ul> 11348 * 11349 * @param size the size of the measure specification 11350 * @param mode the mode of the measure specification 11351 * @return the measure specification based on size and mode 11352 */ 11353 public static int makeMeasureSpec(int size, int mode) { 11354 return size + mode; 11355 } 11356 11357 /** 11358 * Extracts the mode from the supplied measure specification. 11359 * 11360 * @param measureSpec the measure specification to extract the mode from 11361 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 11362 * {@link android.view.View.MeasureSpec#AT_MOST} or 11363 * {@link android.view.View.MeasureSpec#EXACTLY} 11364 */ 11365 public static int getMode(int measureSpec) { 11366 return (measureSpec & MODE_MASK); 11367 } 11368 11369 /** 11370 * Extracts the size from the supplied measure specification. 11371 * 11372 * @param measureSpec the measure specification to extract the size from 11373 * @return the size in pixels defined in the supplied measure specification 11374 */ 11375 public static int getSize(int measureSpec) { 11376 return (measureSpec & ~MODE_MASK); 11377 } 11378 11379 /** 11380 * Returns a String representation of the specified measure 11381 * specification. 11382 * 11383 * @param measureSpec the measure specification to convert to a String 11384 * @return a String with the following format: "MeasureSpec: MODE SIZE" 11385 */ 11386 public static String toString(int measureSpec) { 11387 int mode = getMode(measureSpec); 11388 int size = getSize(measureSpec); 11389 11390 StringBuilder sb = new StringBuilder("MeasureSpec: "); 11391 11392 if (mode == UNSPECIFIED) 11393 sb.append("UNSPECIFIED "); 11394 else if (mode == EXACTLY) 11395 sb.append("EXACTLY "); 11396 else if (mode == AT_MOST) 11397 sb.append("AT_MOST "); 11398 else 11399 sb.append(mode).append(" "); 11400 11401 sb.append(size); 11402 return sb.toString(); 11403 } 11404 } 11405 11406 class CheckForLongPress implements Runnable { 11407 11408 private int mOriginalWindowAttachCount; 11409 11410 public void run() { 11411 if (isPressed() && (mParent != null) 11412 && mOriginalWindowAttachCount == mWindowAttachCount) { 11413 if (performLongClick()) { 11414 mHasPerformedLongPress = true; 11415 } 11416 } 11417 } 11418 11419 public void rememberWindowAttachCount() { 11420 mOriginalWindowAttachCount = mWindowAttachCount; 11421 } 11422 } 11423 11424 private final class CheckForTap implements Runnable { 11425 public void run() { 11426 mPrivateFlags &= ~PREPRESSED; 11427 mPrivateFlags |= PRESSED; 11428 refreshDrawableState(); 11429 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 11430 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 11431 } 11432 } 11433 } 11434 11435 private final class PerformClick implements Runnable { 11436 public void run() { 11437 performClick(); 11438 } 11439 } 11440 11441 /** @hide */ 11442 public void hackTurnOffWindowResizeAnim(boolean off) { 11443 mAttachInfo.mTurnOffWindowResizeAnim = off; 11444 } 11445 11446 /** 11447 * Interface definition for a callback to be invoked when a key event is 11448 * dispatched to this view. The callback will be invoked before the key 11449 * event is given to the view. 11450 */ 11451 public interface OnKeyListener { 11452 /** 11453 * Called when a key is dispatched to a view. This allows listeners to 11454 * get a chance to respond before the target view. 11455 * 11456 * @param v The view the key has been dispatched to. 11457 * @param keyCode The code for the physical key that was pressed 11458 * @param event The KeyEvent object containing full information about 11459 * the event. 11460 * @return True if the listener has consumed the event, false otherwise. 11461 */ 11462 boolean onKey(View v, int keyCode, KeyEvent event); 11463 } 11464 11465 /** 11466 * Interface definition for a callback to be invoked when a touch event is 11467 * dispatched to this view. The callback will be invoked before the touch 11468 * event is given to the view. 11469 */ 11470 public interface OnTouchListener { 11471 /** 11472 * Called when a touch event is dispatched to a view. This allows listeners to 11473 * get a chance to respond before the target view. 11474 * 11475 * @param v The view the touch event has been dispatched to. 11476 * @param event The MotionEvent object containing full information about 11477 * the event. 11478 * @return True if the listener has consumed the event, false otherwise. 11479 */ 11480 boolean onTouch(View v, MotionEvent event); 11481 } 11482 11483 /** 11484 * Interface definition for a callback to be invoked when a view has been clicked and held. 11485 */ 11486 public interface OnLongClickListener { 11487 /** 11488 * Called when a view has been clicked and held. 11489 * 11490 * @param v The view that was clicked and held. 11491 * 11492 * @return true if the callback consumed the long click, false otherwise. 11493 */ 11494 boolean onLongClick(View v); 11495 } 11496 11497 /** 11498 * Interface definition for a callback to be invoked when a drag is being dispatched 11499 * to this view. The callback will be invoked before the hosting view's own 11500 * onDrag(event) method. If the listener wants to fall back to the hosting view's 11501 * onDrag(event) behavior, it should return 'false' from this callback. 11502 */ 11503 public interface OnDragListener { 11504 /** 11505 * Called when a drag event is dispatched to a view. This allows listeners 11506 * to get a chance to override base View behavior. 11507 * 11508 * @param v The view the drag has been dispatched to. 11509 * @param event The DragEvent object containing full information 11510 * about the event. 11511 * @return true if the listener consumed the DragEvent, false in order to fall 11512 * back to the view's default handling. 11513 */ 11514 boolean onDrag(View v, DragEvent event); 11515 } 11516 11517 /** 11518 * Interface definition for a callback to be invoked when the focus state of 11519 * a view changed. 11520 */ 11521 public interface OnFocusChangeListener { 11522 /** 11523 * Called when the focus state of a view has changed. 11524 * 11525 * @param v The view whose state has changed. 11526 * @param hasFocus The new focus state of v. 11527 */ 11528 void onFocusChange(View v, boolean hasFocus); 11529 } 11530 11531 /** 11532 * Interface definition for a callback to be invoked when a view is clicked. 11533 */ 11534 public interface OnClickListener { 11535 /** 11536 * Called when a view has been clicked. 11537 * 11538 * @param v The view that was clicked. 11539 */ 11540 void onClick(View v); 11541 } 11542 11543 /** 11544 * Interface definition for a callback to be invoked when the context menu 11545 * for this view is being built. 11546 */ 11547 public interface OnCreateContextMenuListener { 11548 /** 11549 * Called when the context menu for this view is being built. It is not 11550 * safe to hold onto the menu after this method returns. 11551 * 11552 * @param menu The context menu that is being built 11553 * @param v The view for which the context menu is being built 11554 * @param menuInfo Extra information about the item for which the 11555 * context menu should be shown. This information will vary 11556 * depending on the class of v. 11557 */ 11558 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 11559 } 11560 11561 /** 11562 * Interface definition for a callback to be invoked when the status bar changes 11563 * visibility. 11564 * 11565 * @see #setOnSystemUiVisibilityChangeListener 11566 */ 11567 public interface OnSystemUiVisibilityChangeListener { 11568 /** 11569 * Called when the status bar changes visibility because of a call to 11570 * {@link #setSystemUiVisibility}. 11571 * 11572 * @param visibility {@link #STATUS_BAR_VISIBLE} or {@link #STATUS_BAR_HIDDEN}. 11573 */ 11574 public void onSystemUiVisibilityChange(int visibility); 11575 } 11576 11577 private final class UnsetPressedState implements Runnable { 11578 public void run() { 11579 setPressed(false); 11580 } 11581 } 11582 11583 /** 11584 * Base class for derived classes that want to save and restore their own 11585 * state in {@link android.view.View#onSaveInstanceState()}. 11586 */ 11587 public static class BaseSavedState extends AbsSavedState { 11588 /** 11589 * Constructor used when reading from a parcel. Reads the state of the superclass. 11590 * 11591 * @param source 11592 */ 11593 public BaseSavedState(Parcel source) { 11594 super(source); 11595 } 11596 11597 /** 11598 * Constructor called by derived classes when creating their SavedState objects 11599 * 11600 * @param superState The state of the superclass of this view 11601 */ 11602 public BaseSavedState(Parcelable superState) { 11603 super(superState); 11604 } 11605 11606 public static final Parcelable.Creator<BaseSavedState> CREATOR = 11607 new Parcelable.Creator<BaseSavedState>() { 11608 public BaseSavedState createFromParcel(Parcel in) { 11609 return new BaseSavedState(in); 11610 } 11611 11612 public BaseSavedState[] newArray(int size) { 11613 return new BaseSavedState[size]; 11614 } 11615 }; 11616 } 11617 11618 /** 11619 * A set of information given to a view when it is attached to its parent 11620 * window. 11621 */ 11622 static class AttachInfo { 11623 interface Callbacks { 11624 void playSoundEffect(int effectId); 11625 boolean performHapticFeedback(int effectId, boolean always); 11626 } 11627 11628 /** 11629 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 11630 * to a Handler. This class contains the target (View) to invalidate and 11631 * the coordinates of the dirty rectangle. 11632 * 11633 * For performance purposes, this class also implements a pool of up to 11634 * POOL_LIMIT objects that get reused. This reduces memory allocations 11635 * whenever possible. 11636 */ 11637 static class InvalidateInfo implements Poolable<InvalidateInfo> { 11638 private static final int POOL_LIMIT = 10; 11639 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 11640 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 11641 public InvalidateInfo newInstance() { 11642 return new InvalidateInfo(); 11643 } 11644 11645 public void onAcquired(InvalidateInfo element) { 11646 } 11647 11648 public void onReleased(InvalidateInfo element) { 11649 } 11650 }, POOL_LIMIT) 11651 ); 11652 11653 private InvalidateInfo mNext; 11654 11655 View target; 11656 11657 int left; 11658 int top; 11659 int right; 11660 int bottom; 11661 11662 public void setNextPoolable(InvalidateInfo element) { 11663 mNext = element; 11664 } 11665 11666 public InvalidateInfo getNextPoolable() { 11667 return mNext; 11668 } 11669 11670 static InvalidateInfo acquire() { 11671 return sPool.acquire(); 11672 } 11673 11674 void release() { 11675 sPool.release(this); 11676 } 11677 } 11678 11679 final IWindowSession mSession; 11680 11681 final IWindow mWindow; 11682 11683 final IBinder mWindowToken; 11684 11685 final Callbacks mRootCallbacks; 11686 11687 Canvas mHardwareCanvas; 11688 11689 /** 11690 * The top view of the hierarchy. 11691 */ 11692 View mRootView; 11693 11694 IBinder mPanelParentWindowToken; 11695 Surface mSurface; 11696 11697 boolean mHardwareAccelerated; 11698 boolean mHardwareAccelerationRequested; 11699 HardwareRenderer mHardwareRenderer; 11700 11701 /** 11702 * Scale factor used by the compatibility mode 11703 */ 11704 float mApplicationScale; 11705 11706 /** 11707 * Indicates whether the application is in compatibility mode 11708 */ 11709 boolean mScalingRequired; 11710 11711 /** 11712 * If set, ViewRoot doesn't use its lame animation for when the window resizes. 11713 */ 11714 boolean mTurnOffWindowResizeAnim; 11715 11716 /** 11717 * Left position of this view's window 11718 */ 11719 int mWindowLeft; 11720 11721 /** 11722 * Top position of this view's window 11723 */ 11724 int mWindowTop; 11725 11726 /** 11727 * Indicates whether views need to use 32-bit drawing caches 11728 */ 11729 boolean mUse32BitDrawingCache; 11730 11731 /** 11732 * For windows that are full-screen but using insets to layout inside 11733 * of the screen decorations, these are the current insets for the 11734 * content of the window. 11735 */ 11736 final Rect mContentInsets = new Rect(); 11737 11738 /** 11739 * For windows that are full-screen but using insets to layout inside 11740 * of the screen decorations, these are the current insets for the 11741 * actual visible parts of the window. 11742 */ 11743 final Rect mVisibleInsets = new Rect(); 11744 11745 /** 11746 * The internal insets given by this window. This value is 11747 * supplied by the client (through 11748 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 11749 * be given to the window manager when changed to be used in laying 11750 * out windows behind it. 11751 */ 11752 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 11753 = new ViewTreeObserver.InternalInsetsInfo(); 11754 11755 /** 11756 * All views in the window's hierarchy that serve as scroll containers, 11757 * used to determine if the window can be resized or must be panned 11758 * to adjust for a soft input area. 11759 */ 11760 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 11761 11762 final KeyEvent.DispatcherState mKeyDispatchState 11763 = new KeyEvent.DispatcherState(); 11764 11765 /** 11766 * Indicates whether the view's window currently has the focus. 11767 */ 11768 boolean mHasWindowFocus; 11769 11770 /** 11771 * The current visibility of the window. 11772 */ 11773 int mWindowVisibility; 11774 11775 /** 11776 * Indicates the time at which drawing started to occur. 11777 */ 11778 long mDrawingTime; 11779 11780 /** 11781 * Indicates whether or not ignoring the DIRTY_MASK flags. 11782 */ 11783 boolean mIgnoreDirtyState; 11784 11785 /** 11786 * Indicates whether the view's window is currently in touch mode. 11787 */ 11788 boolean mInTouchMode; 11789 11790 /** 11791 * Indicates that ViewRoot should trigger a global layout change 11792 * the next time it performs a traversal 11793 */ 11794 boolean mRecomputeGlobalAttributes; 11795 11796 /** 11797 * Set during a traveral if any views want to keep the screen on. 11798 */ 11799 boolean mKeepScreenOn; 11800 11801 /** 11802 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 11803 */ 11804 int mSystemUiVisibility; 11805 11806 /** 11807 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 11808 * attached. 11809 */ 11810 boolean mHasSystemUiListeners; 11811 11812 /** 11813 * Set if the visibility of any views has changed. 11814 */ 11815 boolean mViewVisibilityChanged; 11816 11817 /** 11818 * Set to true if a view has been scrolled. 11819 */ 11820 boolean mViewScrollChanged; 11821 11822 /** 11823 * Global to the view hierarchy used as a temporary for dealing with 11824 * x/y points in the transparent region computations. 11825 */ 11826 final int[] mTransparentLocation = new int[2]; 11827 11828 /** 11829 * Global to the view hierarchy used as a temporary for dealing with 11830 * x/y points in the ViewGroup.invalidateChild implementation. 11831 */ 11832 final int[] mInvalidateChildLocation = new int[2]; 11833 11834 11835 /** 11836 * Global to the view hierarchy used as a temporary for dealing with 11837 * x/y location when view is transformed. 11838 */ 11839 final float[] mTmpTransformLocation = new float[2]; 11840 11841 /** 11842 * The view tree observer used to dispatch global events like 11843 * layout, pre-draw, touch mode change, etc. 11844 */ 11845 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 11846 11847 /** 11848 * A Canvas used by the view hierarchy to perform bitmap caching. 11849 */ 11850 Canvas mCanvas; 11851 11852 /** 11853 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 11854 * handler can be used to pump events in the UI events queue. 11855 */ 11856 final Handler mHandler; 11857 11858 /** 11859 * Identifier for messages requesting the view to be invalidated. 11860 * Such messages should be sent to {@link #mHandler}. 11861 */ 11862 static final int INVALIDATE_MSG = 0x1; 11863 11864 /** 11865 * Identifier for messages requesting the view to invalidate a region. 11866 * Such messages should be sent to {@link #mHandler}. 11867 */ 11868 static final int INVALIDATE_RECT_MSG = 0x2; 11869 11870 /** 11871 * Temporary for use in computing invalidate rectangles while 11872 * calling up the hierarchy. 11873 */ 11874 final Rect mTmpInvalRect = new Rect(); 11875 11876 /** 11877 * Temporary for use in computing hit areas with transformed views 11878 */ 11879 final RectF mTmpTransformRect = new RectF(); 11880 11881 /** 11882 * Temporary list for use in collecting focusable descendents of a view. 11883 */ 11884 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 11885 11886 /** 11887 * Creates a new set of attachment information with the specified 11888 * events handler and thread. 11889 * 11890 * @param handler the events handler the view must use 11891 */ 11892 AttachInfo(IWindowSession session, IWindow window, 11893 Handler handler, Callbacks effectPlayer) { 11894 mSession = session; 11895 mWindow = window; 11896 mWindowToken = window.asBinder(); 11897 mHandler = handler; 11898 mRootCallbacks = effectPlayer; 11899 } 11900 } 11901 11902 /** 11903 * <p>ScrollabilityCache holds various fields used by a View when scrolling 11904 * is supported. This avoids keeping too many unused fields in most 11905 * instances of View.</p> 11906 */ 11907 private static class ScrollabilityCache implements Runnable { 11908 11909 /** 11910 * Scrollbars are not visible 11911 */ 11912 public static final int OFF = 0; 11913 11914 /** 11915 * Scrollbars are visible 11916 */ 11917 public static final int ON = 1; 11918 11919 /** 11920 * Scrollbars are fading away 11921 */ 11922 public static final int FADING = 2; 11923 11924 public boolean fadeScrollBars; 11925 11926 public int fadingEdgeLength; 11927 public int scrollBarDefaultDelayBeforeFade; 11928 public int scrollBarFadeDuration; 11929 11930 public int scrollBarSize; 11931 public ScrollBarDrawable scrollBar; 11932 public float[] interpolatorValues; 11933 public View host; 11934 11935 public final Paint paint; 11936 public final Matrix matrix; 11937 public Shader shader; 11938 11939 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 11940 11941 private static final float[] OPAQUE = { 255 }; 11942 private static final float[] TRANSPARENT = { 0.0f }; 11943 11944 /** 11945 * When fading should start. This time moves into the future every time 11946 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 11947 */ 11948 public long fadeStartTime; 11949 11950 11951 /** 11952 * The current state of the scrollbars: ON, OFF, or FADING 11953 */ 11954 public int state = OFF; 11955 11956 private int mLastColor; 11957 11958 public ScrollabilityCache(ViewConfiguration configuration, View host) { 11959 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 11960 scrollBarSize = configuration.getScaledScrollBarSize(); 11961 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 11962 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 11963 11964 paint = new Paint(); 11965 matrix = new Matrix(); 11966 // use use a height of 1, and then wack the matrix each time we 11967 // actually use it. 11968 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 11969 11970 paint.setShader(shader); 11971 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 11972 this.host = host; 11973 } 11974 11975 public void setFadeColor(int color) { 11976 if (color != 0 && color != mLastColor) { 11977 mLastColor = color; 11978 color |= 0xFF000000; 11979 11980 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 11981 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 11982 11983 paint.setShader(shader); 11984 // Restore the default transfer mode (src_over) 11985 paint.setXfermode(null); 11986 } 11987 } 11988 11989 public void run() { 11990 long now = AnimationUtils.currentAnimationTimeMillis(); 11991 if (now >= fadeStartTime) { 11992 11993 // the animation fades the scrollbars out by changing 11994 // the opacity (alpha) from fully opaque to fully 11995 // transparent 11996 int nextFrame = (int) now; 11997 int framesCount = 0; 11998 11999 Interpolator interpolator = scrollBarInterpolator; 12000 12001 // Start opaque 12002 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 12003 12004 // End transparent 12005 nextFrame += scrollBarFadeDuration; 12006 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 12007 12008 state = FADING; 12009 12010 // Kick off the fade animation 12011 host.invalidate(true); 12012 } 12013 } 12014 12015 } 12016} 12017