View.java revision a953359db5250d0f648c7ca210ef3954bf1f8b66
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.View.MeasureSpec; 62import android.view.accessibility.AccessibilityEvent; 63import android.view.accessibility.AccessibilityEventSource; 64import android.view.accessibility.AccessibilityManager; 65import android.view.animation.Animation; 66import android.view.animation.AnimationUtils; 67import android.view.inputmethod.EditorInfo; 68import android.view.inputmethod.InputConnection; 69import android.view.inputmethod.InputMethodManager; 70import android.widget.ScrollBarDrawable; 71 72import java.lang.ref.WeakReference; 73import java.lang.reflect.InvocationTargetException; 74import java.lang.reflect.Method; 75import java.util.ArrayList; 76import java.util.Arrays; 77import java.util.List; 78import java.util.WeakHashMap; 79 80/** 81 * <p> 82 * This class represents the basic building block for user interface components. A View 83 * occupies a rectangular area on the screen and is responsible for drawing and 84 * event handling. View is the base class for <em>widgets</em>, which are 85 * used to create interactive UI components (buttons, text fields, etc.). The 86 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 87 * are invisible containers that hold other Views (or other ViewGroups) and define 88 * their layout properties. 89 * </p> 90 * 91 * <div class="special"> 92 * <p>For an introduction to using this class to develop your 93 * application's user interface, read the Developer Guide documentation on 94 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 95 * include: 96 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 97 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 103 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 104 * </p> 105 * </div> 106 * 107 * <a name="Using"></a> 108 * <h3>Using Views</h3> 109 * <p> 110 * All of the views in a window are arranged in a single tree. You can add views 111 * either from code or by specifying a tree of views in one or more XML layout 112 * files. There are many specialized subclasses of views that act as controls or 113 * are capable of displaying text, images, or other content. 114 * </p> 115 * <p> 116 * Once you have created a tree of views, there are typically a few types of 117 * common operations you may wish to perform: 118 * <ul> 119 * <li><strong>Set properties:</strong> for example setting the text of a 120 * {@link android.widget.TextView}. The available properties and the methods 121 * that set them will vary among the different subclasses of views. Note that 122 * properties that are known at build time can be set in the XML layout 123 * files.</li> 124 * <li><strong>Set focus:</strong> The framework will handled moving focus in 125 * response to user input. To force focus to a specific view, call 126 * {@link #requestFocus}.</li> 127 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 128 * that will be notified when something interesting happens to the view. For 129 * example, all views will let you set a listener to be notified when the view 130 * gains or loses focus. You can register such a listener using 131 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 132 * specialized listeners. For example, a Button exposes a listener to notify 133 * clients when the button is clicked.</li> 134 * <li><strong>Set visibility:</strong> You can hide or show views using 135 * {@link #setVisibility}.</li> 136 * </ul> 137 * </p> 138 * <p><em> 139 * Note: The Android framework is responsible for measuring, laying out and 140 * drawing views. You should not call methods that perform these actions on 141 * views yourself unless you are actually implementing a 142 * {@link android.view.ViewGroup}. 143 * </em></p> 144 * 145 * <a name="Lifecycle"></a> 146 * <h3>Implementing a Custom View</h3> 147 * 148 * <p> 149 * To implement a custom view, you will usually begin by providing overrides for 150 * some of the standard methods that the framework calls on all views. You do 151 * not need to override all of these methods. In fact, you can start by just 152 * overriding {@link #onDraw(android.graphics.Canvas)}. 153 * <table border="2" width="85%" align="center" cellpadding="5"> 154 * <thead> 155 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 156 * </thead> 157 * 158 * <tbody> 159 * <tr> 160 * <td rowspan="2">Creation</td> 161 * <td>Constructors</td> 162 * <td>There is a form of the constructor that are called when the view 163 * is created from code and a form that is called when the view is 164 * inflated from a layout file. The second form should parse and apply 165 * any attributes defined in the layout file. 166 * </td> 167 * </tr> 168 * <tr> 169 * <td><code>{@link #onFinishInflate()}</code></td> 170 * <td>Called after a view and all of its children has been inflated 171 * from XML.</td> 172 * </tr> 173 * 174 * <tr> 175 * <td rowspan="3">Layout</td> 176 * <td><code>{@link #onMeasure}</code></td> 177 * <td>Called to determine the size requirements for this view and all 178 * of its children. 179 * </td> 180 * </tr> 181 * <tr> 182 * <td><code>{@link #onLayout}</code></td> 183 * <td>Called when this view should assign a size and position to all 184 * of its children. 185 * </td> 186 * </tr> 187 * <tr> 188 * <td><code>{@link #onSizeChanged}</code></td> 189 * <td>Called when the size of this view has changed. 190 * </td> 191 * </tr> 192 * 193 * <tr> 194 * <td>Drawing</td> 195 * <td><code>{@link #onDraw}</code></td> 196 * <td>Called when the view should render its content. 197 * </td> 198 * </tr> 199 * 200 * <tr> 201 * <td rowspan="4">Event processing</td> 202 * <td><code>{@link #onKeyDown}</code></td> 203 * <td>Called when a new key event occurs. 204 * </td> 205 * </tr> 206 * <tr> 207 * <td><code>{@link #onKeyUp}</code></td> 208 * <td>Called when a key up event occurs. 209 * </td> 210 * </tr> 211 * <tr> 212 * <td><code>{@link #onTrackballEvent}</code></td> 213 * <td>Called when a trackball motion event occurs. 214 * </td> 215 * </tr> 216 * <tr> 217 * <td><code>{@link #onTouchEvent}</code></td> 218 * <td>Called when a touch screen motion event occurs. 219 * </td> 220 * </tr> 221 * 222 * <tr> 223 * <td rowspan="2">Focus</td> 224 * <td><code>{@link #onFocusChanged}</code></td> 225 * <td>Called when the view gains or loses focus. 226 * </td> 227 * </tr> 228 * 229 * <tr> 230 * <td><code>{@link #onWindowFocusChanged}</code></td> 231 * <td>Called when the window containing the view gains or loses focus. 232 * </td> 233 * </tr> 234 * 235 * <tr> 236 * <td rowspan="3">Attaching</td> 237 * <td><code>{@link #onAttachedToWindow()}</code></td> 238 * <td>Called when the view is attached to a window. 239 * </td> 240 * </tr> 241 * 242 * <tr> 243 * <td><code>{@link #onDetachedFromWindow}</code></td> 244 * <td>Called when the view is detached from its window. 245 * </td> 246 * </tr> 247 * 248 * <tr> 249 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 250 * <td>Called when the visibility of the window containing the view 251 * has changed. 252 * </td> 253 * </tr> 254 * </tbody> 255 * 256 * </table> 257 * </p> 258 * 259 * <a name="IDs"></a> 260 * <h3>IDs</h3> 261 * Views may have an integer id associated with them. These ids are typically 262 * assigned in the layout XML files, and are used to find specific views within 263 * the view tree. A common pattern is to: 264 * <ul> 265 * <li>Define a Button in the layout file and assign it a unique ID. 266 * <pre> 267 * <Button 268 * android:id="@+id/my_button" 269 * android:layout_width="wrap_content" 270 * android:layout_height="wrap_content" 271 * android:text="@string/my_button_text"/> 272 * </pre></li> 273 * <li>From the onCreate method of an Activity, find the Button 274 * <pre class="prettyprint"> 275 * Button myButton = (Button) findViewById(R.id.my_button); 276 * </pre></li> 277 * </ul> 278 * <p> 279 * View IDs need not be unique throughout the tree, but it is good practice to 280 * ensure that they are at least unique within the part of the tree you are 281 * searching. 282 * </p> 283 * 284 * <a name="Position"></a> 285 * <h3>Position</h3> 286 * <p> 287 * The geometry of a view is that of a rectangle. A view has a location, 288 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 289 * two dimensions, expressed as a width and a height. The unit for location 290 * and dimensions is the pixel. 291 * </p> 292 * 293 * <p> 294 * It is possible to retrieve the location of a view by invoking the methods 295 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 296 * coordinate of the rectangle representing the view. The latter returns the 297 * top, or Y, coordinate of the rectangle representing the view. These methods 298 * both return the location of the view relative to its parent. For instance, 299 * when getLeft() returns 20, that means the view is located 20 pixels to the 300 * right of the left edge of its direct parent. 301 * </p> 302 * 303 * <p> 304 * In addition, several convenience methods are offered to avoid unnecessary 305 * computations, namely {@link #getRight()} and {@link #getBottom()}. 306 * These methods return the coordinates of the right and bottom edges of the 307 * rectangle representing the view. For instance, calling {@link #getRight()} 308 * is similar to the following computation: <code>getLeft() + getWidth()</code> 309 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 310 * </p> 311 * 312 * <a name="SizePaddingMargins"></a> 313 * <h3>Size, padding and margins</h3> 314 * <p> 315 * The size of a view is expressed with a width and a height. A view actually 316 * possess two pairs of width and height values. 317 * </p> 318 * 319 * <p> 320 * The first pair is known as <em>measured width</em> and 321 * <em>measured height</em>. These dimensions define how big a view wants to be 322 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 323 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 324 * and {@link #getMeasuredHeight()}. 325 * </p> 326 * 327 * <p> 328 * The second pair is simply known as <em>width</em> and <em>height</em>, or 329 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 330 * dimensions define the actual size of the view on screen, at drawing time and 331 * after layout. These values may, but do not have to, be different from the 332 * measured width and height. The width and height can be obtained by calling 333 * {@link #getWidth()} and {@link #getHeight()}. 334 * </p> 335 * 336 * <p> 337 * To measure its dimensions, a view takes into account its padding. The padding 338 * is expressed in pixels for the left, top, right and bottom parts of the view. 339 * Padding can be used to offset the content of the view by a specific amount of 340 * pixels. For instance, a left padding of 2 will push the view's content by 341 * 2 pixels to the right of the left edge. Padding can be set using the 342 * {@link #setPadding(int, int, int, int)} method and queried by calling 343 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 344 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 345 * </p> 346 * 347 * <p> 348 * Even though a view can define a padding, it does not provide any support for 349 * margins. However, view groups provide such a support. Refer to 350 * {@link android.view.ViewGroup} and 351 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 352 * </p> 353 * 354 * <a name="Layout"></a> 355 * <h3>Layout</h3> 356 * <p> 357 * Layout is a two pass process: a measure pass and a layout pass. The measuring 358 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 359 * of the view tree. Each view pushes dimension specifications down the tree 360 * during the recursion. At the end of the measure pass, every view has stored 361 * its measurements. The second pass happens in 362 * {@link #layout(int,int,int,int)} and is also top-down. During 363 * this pass each parent is responsible for positioning all of its children 364 * using the sizes computed in the measure pass. 365 * </p> 366 * 367 * <p> 368 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 369 * {@link #getMeasuredHeight()} values must be set, along with those for all of 370 * that view's descendants. A view's measured width and measured height values 371 * must respect the constraints imposed by the view's parents. This guarantees 372 * that at the end of the measure pass, all parents accept all of their 373 * children's measurements. A parent view may call measure() more than once on 374 * its children. For example, the parent may measure each child once with 375 * unspecified dimensions to find out how big they want to be, then call 376 * measure() on them again with actual numbers if the sum of all the children's 377 * unconstrained sizes is too big or too small. 378 * </p> 379 * 380 * <p> 381 * The measure pass uses two classes to communicate dimensions. The 382 * {@link MeasureSpec} class is used by views to tell their parents how they 383 * want to be measured and positioned. The base LayoutParams class just 384 * describes how big the view wants to be for both width and height. For each 385 * dimension, it can specify one of: 386 * <ul> 387 * <li> an exact number 388 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 389 * (minus padding) 390 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 391 * enclose its content (plus padding). 392 * </ul> 393 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 394 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 395 * an X and Y value. 396 * </p> 397 * 398 * <p> 399 * MeasureSpecs are used to push requirements down the tree from parent to 400 * child. A MeasureSpec can be in one of three modes: 401 * <ul> 402 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 403 * of a child view. For example, a LinearLayout may call measure() on its child 404 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 405 * tall the child view wants to be given a width of 240 pixels. 406 * <li>EXACTLY: This is used by the parent to impose an exact size on the 407 * child. The child must use this size, and guarantee that all of its 408 * descendants will fit within this size. 409 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 410 * child. The child must gurantee that it and all of its descendants will fit 411 * within this size. 412 * </ul> 413 * </p> 414 * 415 * <p> 416 * To intiate a layout, call {@link #requestLayout}. This method is typically 417 * called by a view on itself when it believes that is can no longer fit within 418 * its current bounds. 419 * </p> 420 * 421 * <a name="Drawing"></a> 422 * <h3>Drawing</h3> 423 * <p> 424 * Drawing is handled by walking the tree and rendering each view that 425 * intersects the the invalid region. Because the tree is traversed in-order, 426 * this means that parents will draw before (i.e., behind) their children, with 427 * siblings drawn in the order they appear in the tree. 428 * If you set a background drawable for a View, then the View will draw it for you 429 * before calling back to its <code>onDraw()</code> method. 430 * </p> 431 * 432 * <p> 433 * Note that the framework will not draw views that are not in the invalid region. 434 * </p> 435 * 436 * <p> 437 * To force a view to draw, call {@link #invalidate()}. 438 * </p> 439 * 440 * <a name="EventHandlingThreading"></a> 441 * <h3>Event Handling and Threading</h3> 442 * <p> 443 * The basic cycle of a view is as follows: 444 * <ol> 445 * <li>An event comes in and is dispatched to the appropriate view. The view 446 * handles the event and notifies any listeners.</li> 447 * <li>If in the course of processing the event, the view's bounds may need 448 * to be changed, the view will call {@link #requestLayout()}.</li> 449 * <li>Similarly, if in the course of processing the event the view's appearance 450 * may need to be changed, the view will call {@link #invalidate()}.</li> 451 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 452 * the framework will take care of measuring, laying out, and drawing the tree 453 * as appropriate.</li> 454 * </ol> 455 * </p> 456 * 457 * <p><em>Note: The entire view tree is single threaded. You must always be on 458 * the UI thread when calling any method on any view.</em> 459 * If you are doing work on other threads and want to update the state of a view 460 * from that thread, you should use a {@link Handler}. 461 * </p> 462 * 463 * <a name="FocusHandling"></a> 464 * <h3>Focus Handling</h3> 465 * <p> 466 * The framework will handle routine focus movement in response to user input. 467 * This includes changing the focus as views are removed or hidden, or as new 468 * views become available. Views indicate their willingness to take focus 469 * through the {@link #isFocusable} method. To change whether a view can take 470 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 471 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 472 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 473 * </p> 474 * <p> 475 * Focus movement is based on an algorithm which finds the nearest neighbor in a 476 * given direction. In rare cases, the default algorithm may not match the 477 * intended behavior of the developer. In these situations, you can provide 478 * explicit overrides by using these XML attributes in the layout file: 479 * <pre> 480 * nextFocusDown 481 * nextFocusLeft 482 * nextFocusRight 483 * nextFocusUp 484 * </pre> 485 * </p> 486 * 487 * 488 * <p> 489 * To get a particular view to take focus, call {@link #requestFocus()}. 490 * </p> 491 * 492 * <a name="TouchMode"></a> 493 * <h3>Touch Mode</h3> 494 * <p> 495 * When a user is navigating a user interface via directional keys such as a D-pad, it is 496 * necessary to give focus to actionable items such as buttons so the user can see 497 * what will take input. If the device has touch capabilities, however, and the user 498 * begins interacting with the interface by touching it, it is no longer necessary to 499 * always highlight, or give focus to, a particular view. This motivates a mode 500 * for interaction named 'touch mode'. 501 * </p> 502 * <p> 503 * For a touch capable device, once the user touches the screen, the device 504 * will enter touch mode. From this point onward, only views for which 505 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 506 * Other views that are touchable, like buttons, will not take focus when touched; they will 507 * only fire the on click listeners. 508 * </p> 509 * <p> 510 * Any time a user hits a directional key, such as a D-pad direction, the view device will 511 * exit touch mode, and find a view to take focus, so that the user may resume interacting 512 * with the user interface without touching the screen again. 513 * </p> 514 * <p> 515 * The touch mode state is maintained across {@link android.app.Activity}s. Call 516 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 517 * </p> 518 * 519 * <a name="Scrolling"></a> 520 * <h3>Scrolling</h3> 521 * <p> 522 * The framework provides basic support for views that wish to internally 523 * scroll their content. This includes keeping track of the X and Y scroll 524 * offset as well as mechanisms for drawing scrollbars. See 525 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 526 * {@link #awakenScrollBars()} for more details. 527 * </p> 528 * 529 * <a name="Tags"></a> 530 * <h3>Tags</h3> 531 * <p> 532 * Unlike IDs, tags are not used to identify views. Tags are essentially an 533 * extra piece of information that can be associated with a view. They are most 534 * often used as a convenience to store data related to views in the views 535 * themselves rather than by putting them in a separate structure. 536 * </p> 537 * 538 * <a name="Animation"></a> 539 * <h3>Animation</h3> 540 * <p> 541 * You can attach an {@link Animation} object to a view using 542 * {@link #setAnimation(Animation)} or 543 * {@link #startAnimation(Animation)}. The animation can alter the scale, 544 * rotation, translation and alpha of a view over time. If the animation is 545 * attached to a view that has children, the animation will affect the entire 546 * subtree rooted by that node. When an animation is started, the framework will 547 * take care of redrawing the appropriate views until the animation completes. 548 * </p> 549 * <p> 550 * Starting with Android 3.0, the preferred way of animating views is to use the 551 * {@link android.animation} package APIs. 552 * </p> 553 * 554 * <a name="Security"></a> 555 * <h3>Security</h3> 556 * <p> 557 * Sometimes it is essential that an application be able to verify that an action 558 * is being performed with the full knowledge and consent of the user, such as 559 * granting a permission request, making a purchase or clicking on an advertisement. 560 * Unfortunately, a malicious application could try to spoof the user into 561 * performing these actions, unaware, by concealing the intended purpose of the view. 562 * As a remedy, the framework offers a touch filtering mechanism that can be used to 563 * improve the security of views that provide access to sensitive functionality. 564 * </p><p> 565 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured} or set the 566 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 567 * will discard touches that are received whenever the view's window is obscured by 568 * another visible window. As a result, the view will not receive touches whenever a 569 * toast, dialog or other window appears above the view's window. 570 * </p><p> 571 * For more fine-grained control over security, consider overriding the 572 * {@link #onFilterTouchEventForSecurity} method to implement your own security policy. 573 * See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 574 * </p> 575 * 576 * @attr ref android.R.styleable#View_alpha 577 * @attr ref android.R.styleable#View_background 578 * @attr ref android.R.styleable#View_clickable 579 * @attr ref android.R.styleable#View_contentDescription 580 * @attr ref android.R.styleable#View_drawingCacheQuality 581 * @attr ref android.R.styleable#View_duplicateParentState 582 * @attr ref android.R.styleable#View_id 583 * @attr ref android.R.styleable#View_fadingEdge 584 * @attr ref android.R.styleable#View_fadingEdgeLength 585 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 586 * @attr ref android.R.styleable#View_fitsSystemWindows 587 * @attr ref android.R.styleable#View_isScrollContainer 588 * @attr ref android.R.styleable#View_focusable 589 * @attr ref android.R.styleable#View_focusableInTouchMode 590 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 591 * @attr ref android.R.styleable#View_keepScreenOn 592 * @attr ref android.R.styleable#View_layerType 593 * @attr ref android.R.styleable#View_longClickable 594 * @attr ref android.R.styleable#View_minHeight 595 * @attr ref android.R.styleable#View_minWidth 596 * @attr ref android.R.styleable#View_nextFocusDown 597 * @attr ref android.R.styleable#View_nextFocusLeft 598 * @attr ref android.R.styleable#View_nextFocusRight 599 * @attr ref android.R.styleable#View_nextFocusUp 600 * @attr ref android.R.styleable#View_onClick 601 * @attr ref android.R.styleable#View_padding 602 * @attr ref android.R.styleable#View_paddingBottom 603 * @attr ref android.R.styleable#View_paddingLeft 604 * @attr ref android.R.styleable#View_paddingRight 605 * @attr ref android.R.styleable#View_paddingTop 606 * @attr ref android.R.styleable#View_saveEnabled 607 * @attr ref android.R.styleable#View_rotation 608 * @attr ref android.R.styleable#View_rotationX 609 * @attr ref android.R.styleable#View_rotationY 610 * @attr ref android.R.styleable#View_scaleX 611 * @attr ref android.R.styleable#View_scaleY 612 * @attr ref android.R.styleable#View_scrollX 613 * @attr ref android.R.styleable#View_scrollY 614 * @attr ref android.R.styleable#View_scrollbarSize 615 * @attr ref android.R.styleable#View_scrollbarStyle 616 * @attr ref android.R.styleable#View_scrollbars 617 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 618 * @attr ref android.R.styleable#View_scrollbarFadeDuration 619 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 621 * @attr ref android.R.styleable#View_scrollbarThumbVertical 622 * @attr ref android.R.styleable#View_scrollbarTrackVertical 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 624 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 625 * @attr ref android.R.styleable#View_soundEffectsEnabled 626 * @attr ref android.R.styleable#View_tag 627 * @attr ref android.R.styleable#View_transformPivotX 628 * @attr ref android.R.styleable#View_transformPivotY 629 * @attr ref android.R.styleable#View_translationX 630 * @attr ref android.R.styleable#View_translationY 631 * @attr ref android.R.styleable#View_visibility 632 * 633 * @see android.view.ViewGroup 634 */ 635public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 636 private static final boolean DBG = false; 637 638 /** 639 * The logging tag used by this class with android.util.Log. 640 */ 641 protected static final String VIEW_LOG_TAG = "View"; 642 643 /** 644 * Used to mark a View that has no ID. 645 */ 646 public static final int NO_ID = -1; 647 648 /** 649 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 650 * calling setFlags. 651 */ 652 private static final int NOT_FOCUSABLE = 0x00000000; 653 654 /** 655 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 656 * setFlags. 657 */ 658 private static final int FOCUSABLE = 0x00000001; 659 660 /** 661 * Mask for use with setFlags indicating bits used for focus. 662 */ 663 private static final int FOCUSABLE_MASK = 0x00000001; 664 665 /** 666 * This view will adjust its padding to fit sytem windows (e.g. status bar) 667 */ 668 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 669 670 /** 671 * This view is visible. Use with {@link #setVisibility}. 672 */ 673 public static final int VISIBLE = 0x00000000; 674 675 /** 676 * This view is invisible, but it still takes up space for layout purposes. 677 * Use with {@link #setVisibility}. 678 */ 679 public static final int INVISIBLE = 0x00000004; 680 681 /** 682 * This view is invisible, and it doesn't take any space for layout 683 * purposes. Use with {@link #setVisibility}. 684 */ 685 public static final int GONE = 0x00000008; 686 687 /** 688 * Mask for use with setFlags indicating bits used for visibility. 689 * {@hide} 690 */ 691 static final int VISIBILITY_MASK = 0x0000000C; 692 693 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 694 695 /** 696 * This view is enabled. Intrepretation varies by subclass. 697 * Use with ENABLED_MASK when calling setFlags. 698 * {@hide} 699 */ 700 static final int ENABLED = 0x00000000; 701 702 /** 703 * This view is disabled. Intrepretation varies by subclass. 704 * Use with ENABLED_MASK when calling setFlags. 705 * {@hide} 706 */ 707 static final int DISABLED = 0x00000020; 708 709 /** 710 * Mask for use with setFlags indicating bits used for indicating whether 711 * this view is enabled 712 * {@hide} 713 */ 714 static final int ENABLED_MASK = 0x00000020; 715 716 /** 717 * This view won't draw. {@link #onDraw} won't be called and further 718 * optimizations 719 * will be performed. It is okay to have this flag set and a background. 720 * Use with DRAW_MASK when calling setFlags. 721 * {@hide} 722 */ 723 static final int WILL_NOT_DRAW = 0x00000080; 724 725 /** 726 * Mask for use with setFlags indicating bits used for indicating whether 727 * this view is will draw 728 * {@hide} 729 */ 730 static final int DRAW_MASK = 0x00000080; 731 732 /** 733 * <p>This view doesn't show scrollbars.</p> 734 * {@hide} 735 */ 736 static final int SCROLLBARS_NONE = 0x00000000; 737 738 /** 739 * <p>This view shows horizontal scrollbars.</p> 740 * {@hide} 741 */ 742 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 743 744 /** 745 * <p>This view shows vertical scrollbars.</p> 746 * {@hide} 747 */ 748 static final int SCROLLBARS_VERTICAL = 0x00000200; 749 750 /** 751 * <p>Mask for use with setFlags indicating bits used for indicating which 752 * scrollbars are enabled.</p> 753 * {@hide} 754 */ 755 static final int SCROLLBARS_MASK = 0x00000300; 756 757 /** 758 * Indicates that the view should filter touches when its window is obscured. 759 * Refer to the class comments for more information about this security feature. 760 * {@hide} 761 */ 762 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 763 764 // note flag value 0x00000800 is now available for next flags... 765 766 /** 767 * <p>This view doesn't show fading edges.</p> 768 * {@hide} 769 */ 770 static final int FADING_EDGE_NONE = 0x00000000; 771 772 /** 773 * <p>This view shows horizontal fading edges.</p> 774 * {@hide} 775 */ 776 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 777 778 /** 779 * <p>This view shows vertical fading edges.</p> 780 * {@hide} 781 */ 782 static final int FADING_EDGE_VERTICAL = 0x00002000; 783 784 /** 785 * <p>Mask for use with setFlags indicating bits used for indicating which 786 * fading edges are enabled.</p> 787 * {@hide} 788 */ 789 static final int FADING_EDGE_MASK = 0x00003000; 790 791 /** 792 * <p>Indicates this view can be clicked. When clickable, a View reacts 793 * to clicks by notifying the OnClickListener.<p> 794 * {@hide} 795 */ 796 static final int CLICKABLE = 0x00004000; 797 798 /** 799 * <p>Indicates this view is caching its drawing into a bitmap.</p> 800 * {@hide} 801 */ 802 static final int DRAWING_CACHE_ENABLED = 0x00008000; 803 804 /** 805 * <p>Indicates that no icicle should be saved for this view.<p> 806 * {@hide} 807 */ 808 static final int SAVE_DISABLED = 0x000010000; 809 810 /** 811 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 812 * property.</p> 813 * {@hide} 814 */ 815 static final int SAVE_DISABLED_MASK = 0x000010000; 816 817 /** 818 * <p>Indicates that no drawing cache should ever be created for this view.<p> 819 * {@hide} 820 */ 821 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 822 823 /** 824 * <p>Indicates this view can take / keep focus when int touch mode.</p> 825 * {@hide} 826 */ 827 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 828 829 /** 830 * <p>Enables low quality mode for the drawing cache.</p> 831 */ 832 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 833 834 /** 835 * <p>Enables high quality mode for the drawing cache.</p> 836 */ 837 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 838 839 /** 840 * <p>Enables automatic quality mode for the drawing cache.</p> 841 */ 842 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 843 844 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 845 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 846 }; 847 848 /** 849 * <p>Mask for use with setFlags indicating bits used for the cache 850 * quality property.</p> 851 * {@hide} 852 */ 853 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 854 855 /** 856 * <p> 857 * Indicates this view can be long clicked. When long clickable, a View 858 * reacts to long clicks by notifying the OnLongClickListener or showing a 859 * context menu. 860 * </p> 861 * {@hide} 862 */ 863 static final int LONG_CLICKABLE = 0x00200000; 864 865 /** 866 * <p>Indicates that this view gets its drawable states from its direct parent 867 * and ignores its original internal states.</p> 868 * 869 * @hide 870 */ 871 static final int DUPLICATE_PARENT_STATE = 0x00400000; 872 873 /** 874 * The scrollbar style to display the scrollbars inside the content area, 875 * without increasing the padding. The scrollbars will be overlaid with 876 * translucency on the view's content. 877 */ 878 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 879 880 /** 881 * The scrollbar style to display the scrollbars inside the padded area, 882 * increasing the padding of the view. The scrollbars will not overlap the 883 * content area of the view. 884 */ 885 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 886 887 /** 888 * The scrollbar style to display the scrollbars at the edge of the view, 889 * without increasing the padding. The scrollbars will be overlaid with 890 * translucency. 891 */ 892 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 893 894 /** 895 * The scrollbar style to display the scrollbars at the edge of the view, 896 * increasing the padding of the view. The scrollbars will only overlap the 897 * background, if any. 898 */ 899 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 900 901 /** 902 * Mask to check if the scrollbar style is overlay or inset. 903 * {@hide} 904 */ 905 static final int SCROLLBARS_INSET_MASK = 0x01000000; 906 907 /** 908 * Mask to check if the scrollbar style is inside or outside. 909 * {@hide} 910 */ 911 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 912 913 /** 914 * Mask for scrollbar style. 915 * {@hide} 916 */ 917 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 918 919 /** 920 * View flag indicating that the screen should remain on while the 921 * window containing this view is visible to the user. This effectively 922 * takes care of automatically setting the WindowManager's 923 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 924 */ 925 public static final int KEEP_SCREEN_ON = 0x04000000; 926 927 /** 928 * View flag indicating whether this view should have sound effects enabled 929 * for events such as clicking and touching. 930 */ 931 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 932 933 /** 934 * View flag indicating whether this view should have haptic feedback 935 * enabled for events such as long presses. 936 */ 937 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 938 939 /** 940 * <p>Indicates that the view hierarchy should stop saving state when 941 * it reaches this view. If state saving is initiated immediately at 942 * the view, it will be allowed. 943 * {@hide} 944 */ 945 static final int PARENT_SAVE_DISABLED = 0x20000000; 946 947 /** 948 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 949 * {@hide} 950 */ 951 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 952 953 /** 954 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 955 * should add all focusable Views regardless if they are focusable in touch mode. 956 */ 957 public static final int FOCUSABLES_ALL = 0x00000000; 958 959 /** 960 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 961 * should add only Views focusable in touch mode. 962 */ 963 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 964 965 /** 966 * Use with {@link #focusSearch}. Move focus to the previous selectable 967 * item. 968 */ 969 public static final int FOCUS_BACKWARD = 0x00000001; 970 971 /** 972 * Use with {@link #focusSearch}. Move focus to the next selectable 973 * item. 974 */ 975 public static final int FOCUS_FORWARD = 0x00000002; 976 977 /** 978 * Use with {@link #focusSearch}. Move focus to the left. 979 */ 980 public static final int FOCUS_LEFT = 0x00000011; 981 982 /** 983 * Use with {@link #focusSearch}. Move focus up. 984 */ 985 public static final int FOCUS_UP = 0x00000021; 986 987 /** 988 * Use with {@link #focusSearch}. Move focus to the right. 989 */ 990 public static final int FOCUS_RIGHT = 0x00000042; 991 992 /** 993 * Use with {@link #focusSearch}. Move focus down. 994 */ 995 public static final int FOCUS_DOWN = 0x00000082; 996 997 /** 998 * Bits of {@link #getMeasuredWidthAndState()} and 999 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1000 */ 1001 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1002 1003 /** 1004 * Bits of {@link #getMeasuredWidthAndState()} and 1005 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1006 */ 1007 public static final int MEASURED_STATE_MASK = 0xff000000; 1008 1009 /** 1010 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1011 * for functions that combine both width and height into a single int, 1012 * such as {@link #getMeasuredState()} and the childState argument of 1013 * {@link #resolveSizeAndState(int, int, int)}. 1014 */ 1015 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1016 1017 /** 1018 * Bit of {@link #getMeasuredWidthAndState()} and 1019 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1020 * is smaller that the space the view would like to have. 1021 */ 1022 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1023 1024 /** 1025 * Base View state sets 1026 */ 1027 // Singles 1028 /** 1029 * Indicates the view has no states set. States are used with 1030 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1031 * view depending on its state. 1032 * 1033 * @see android.graphics.drawable.Drawable 1034 * @see #getDrawableState() 1035 */ 1036 protected static final int[] EMPTY_STATE_SET; 1037 /** 1038 * Indicates the view is enabled. States are used with 1039 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1040 * view depending on its state. 1041 * 1042 * @see android.graphics.drawable.Drawable 1043 * @see #getDrawableState() 1044 */ 1045 protected static final int[] ENABLED_STATE_SET; 1046 /** 1047 * Indicates the view is focused. States are used with 1048 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1049 * view depending on its state. 1050 * 1051 * @see android.graphics.drawable.Drawable 1052 * @see #getDrawableState() 1053 */ 1054 protected static final int[] FOCUSED_STATE_SET; 1055 /** 1056 * Indicates the view is selected. States are used with 1057 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1058 * view depending on its state. 1059 * 1060 * @see android.graphics.drawable.Drawable 1061 * @see #getDrawableState() 1062 */ 1063 protected static final int[] SELECTED_STATE_SET; 1064 /** 1065 * Indicates the view is pressed. States are used with 1066 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1067 * view depending on its state. 1068 * 1069 * @see android.graphics.drawable.Drawable 1070 * @see #getDrawableState() 1071 * @hide 1072 */ 1073 protected static final int[] PRESSED_STATE_SET; 1074 /** 1075 * Indicates the view's window has focus. States are used with 1076 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1077 * view depending on its state. 1078 * 1079 * @see android.graphics.drawable.Drawable 1080 * @see #getDrawableState() 1081 */ 1082 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1083 // Doubles 1084 /** 1085 * Indicates the view is enabled and has the focus. 1086 * 1087 * @see #ENABLED_STATE_SET 1088 * @see #FOCUSED_STATE_SET 1089 */ 1090 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1091 /** 1092 * Indicates the view is enabled and selected. 1093 * 1094 * @see #ENABLED_STATE_SET 1095 * @see #SELECTED_STATE_SET 1096 */ 1097 protected static final int[] ENABLED_SELECTED_STATE_SET; 1098 /** 1099 * Indicates the view is enabled and that its window has focus. 1100 * 1101 * @see #ENABLED_STATE_SET 1102 * @see #WINDOW_FOCUSED_STATE_SET 1103 */ 1104 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1105 /** 1106 * Indicates the view is focused and selected. 1107 * 1108 * @see #FOCUSED_STATE_SET 1109 * @see #SELECTED_STATE_SET 1110 */ 1111 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1112 /** 1113 * Indicates the view has the focus and that its window has the focus. 1114 * 1115 * @see #FOCUSED_STATE_SET 1116 * @see #WINDOW_FOCUSED_STATE_SET 1117 */ 1118 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1119 /** 1120 * Indicates the view is selected and that its window has the focus. 1121 * 1122 * @see #SELECTED_STATE_SET 1123 * @see #WINDOW_FOCUSED_STATE_SET 1124 */ 1125 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1126 // Triples 1127 /** 1128 * Indicates the view is enabled, focused and selected. 1129 * 1130 * @see #ENABLED_STATE_SET 1131 * @see #FOCUSED_STATE_SET 1132 * @see #SELECTED_STATE_SET 1133 */ 1134 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1135 /** 1136 * Indicates the view is enabled, focused and its window has the focus. 1137 * 1138 * @see #ENABLED_STATE_SET 1139 * @see #FOCUSED_STATE_SET 1140 * @see #WINDOW_FOCUSED_STATE_SET 1141 */ 1142 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1143 /** 1144 * Indicates the view is enabled, selected and its window has the focus. 1145 * 1146 * @see #ENABLED_STATE_SET 1147 * @see #SELECTED_STATE_SET 1148 * @see #WINDOW_FOCUSED_STATE_SET 1149 */ 1150 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1151 /** 1152 * Indicates the view is focused, selected and its window has the focus. 1153 * 1154 * @see #FOCUSED_STATE_SET 1155 * @see #SELECTED_STATE_SET 1156 * @see #WINDOW_FOCUSED_STATE_SET 1157 */ 1158 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1159 /** 1160 * Indicates the view is enabled, focused, selected and its window 1161 * has the focus. 1162 * 1163 * @see #ENABLED_STATE_SET 1164 * @see #FOCUSED_STATE_SET 1165 * @see #SELECTED_STATE_SET 1166 * @see #WINDOW_FOCUSED_STATE_SET 1167 */ 1168 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1169 /** 1170 * Indicates the view is pressed and its window has the focus. 1171 * 1172 * @see #PRESSED_STATE_SET 1173 * @see #WINDOW_FOCUSED_STATE_SET 1174 */ 1175 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1176 /** 1177 * Indicates the view is pressed and selected. 1178 * 1179 * @see #PRESSED_STATE_SET 1180 * @see #SELECTED_STATE_SET 1181 */ 1182 protected static final int[] PRESSED_SELECTED_STATE_SET; 1183 /** 1184 * Indicates the view is pressed, selected and its window has the focus. 1185 * 1186 * @see #PRESSED_STATE_SET 1187 * @see #SELECTED_STATE_SET 1188 * @see #WINDOW_FOCUSED_STATE_SET 1189 */ 1190 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1191 /** 1192 * Indicates the view is pressed and focused. 1193 * 1194 * @see #PRESSED_STATE_SET 1195 * @see #FOCUSED_STATE_SET 1196 */ 1197 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1198 /** 1199 * Indicates the view is pressed, focused and its window has the focus. 1200 * 1201 * @see #PRESSED_STATE_SET 1202 * @see #FOCUSED_STATE_SET 1203 * @see #WINDOW_FOCUSED_STATE_SET 1204 */ 1205 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1206 /** 1207 * Indicates the view is pressed, focused and selected. 1208 * 1209 * @see #PRESSED_STATE_SET 1210 * @see #SELECTED_STATE_SET 1211 * @see #FOCUSED_STATE_SET 1212 */ 1213 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1214 /** 1215 * Indicates the view is pressed, focused, selected and its window has the focus. 1216 * 1217 * @see #PRESSED_STATE_SET 1218 * @see #FOCUSED_STATE_SET 1219 * @see #SELECTED_STATE_SET 1220 * @see #WINDOW_FOCUSED_STATE_SET 1221 */ 1222 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1223 /** 1224 * Indicates the view is pressed and enabled. 1225 * 1226 * @see #PRESSED_STATE_SET 1227 * @see #ENABLED_STATE_SET 1228 */ 1229 protected static final int[] PRESSED_ENABLED_STATE_SET; 1230 /** 1231 * Indicates the view is pressed, enabled and its window has the focus. 1232 * 1233 * @see #PRESSED_STATE_SET 1234 * @see #ENABLED_STATE_SET 1235 * @see #WINDOW_FOCUSED_STATE_SET 1236 */ 1237 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1238 /** 1239 * Indicates the view is pressed, enabled and selected. 1240 * 1241 * @see #PRESSED_STATE_SET 1242 * @see #ENABLED_STATE_SET 1243 * @see #SELECTED_STATE_SET 1244 */ 1245 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1246 /** 1247 * Indicates the view is pressed, enabled, selected and its window has the 1248 * focus. 1249 * 1250 * @see #PRESSED_STATE_SET 1251 * @see #ENABLED_STATE_SET 1252 * @see #SELECTED_STATE_SET 1253 * @see #WINDOW_FOCUSED_STATE_SET 1254 */ 1255 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1256 /** 1257 * Indicates the view is pressed, enabled and focused. 1258 * 1259 * @see #PRESSED_STATE_SET 1260 * @see #ENABLED_STATE_SET 1261 * @see #FOCUSED_STATE_SET 1262 */ 1263 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1264 /** 1265 * Indicates the view is pressed, enabled, focused and its window has the 1266 * focus. 1267 * 1268 * @see #PRESSED_STATE_SET 1269 * @see #ENABLED_STATE_SET 1270 * @see #FOCUSED_STATE_SET 1271 * @see #WINDOW_FOCUSED_STATE_SET 1272 */ 1273 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1274 /** 1275 * Indicates the view is pressed, enabled, focused and selected. 1276 * 1277 * @see #PRESSED_STATE_SET 1278 * @see #ENABLED_STATE_SET 1279 * @see #SELECTED_STATE_SET 1280 * @see #FOCUSED_STATE_SET 1281 */ 1282 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1283 /** 1284 * Indicates the view is pressed, enabled, focused, selected and its window 1285 * has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #ENABLED_STATE_SET 1289 * @see #SELECTED_STATE_SET 1290 * @see #FOCUSED_STATE_SET 1291 * @see #WINDOW_FOCUSED_STATE_SET 1292 */ 1293 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1294 1295 /** 1296 * The order here is very important to {@link #getDrawableState()} 1297 */ 1298 private static final int[][] VIEW_STATE_SETS; 1299 1300 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1301 static final int VIEW_STATE_SELECTED = 1 << 1; 1302 static final int VIEW_STATE_FOCUSED = 1 << 2; 1303 static final int VIEW_STATE_ENABLED = 1 << 3; 1304 static final int VIEW_STATE_PRESSED = 1 << 4; 1305 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1306 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1307 1308 static final int[] VIEW_STATE_IDS = new int[] { 1309 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1310 R.attr.state_selected, VIEW_STATE_SELECTED, 1311 R.attr.state_focused, VIEW_STATE_FOCUSED, 1312 R.attr.state_enabled, VIEW_STATE_ENABLED, 1313 R.attr.state_pressed, VIEW_STATE_PRESSED, 1314 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1315 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1316 }; 1317 1318 static { 1319 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1320 throw new IllegalStateException( 1321 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1322 } 1323 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1324 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1325 int viewState = R.styleable.ViewDrawableStates[i]; 1326 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1327 if (VIEW_STATE_IDS[j] == viewState) { 1328 orderedIds[i * 2] = viewState; 1329 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1330 } 1331 } 1332 } 1333 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1334 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1335 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1336 int numBits = Integer.bitCount(i); 1337 int[] set = new int[numBits]; 1338 int pos = 0; 1339 for (int j = 0; j < orderedIds.length; j += 2) { 1340 if ((i & orderedIds[j+1]) != 0) { 1341 set[pos++] = orderedIds[j]; 1342 } 1343 } 1344 VIEW_STATE_SETS[i] = set; 1345 } 1346 1347 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1348 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1349 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1350 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1351 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1352 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1353 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1354 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1355 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1356 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1357 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1358 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1359 | VIEW_STATE_FOCUSED]; 1360 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1361 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1362 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1363 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1364 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1365 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1366 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1367 | VIEW_STATE_ENABLED]; 1368 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1369 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1370 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1371 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1372 | VIEW_STATE_ENABLED]; 1373 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1374 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1375 | VIEW_STATE_ENABLED]; 1376 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1377 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1378 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1379 1380 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1381 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1382 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1383 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1384 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1385 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1386 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1387 | VIEW_STATE_PRESSED]; 1388 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1389 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1390 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1391 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1392 | VIEW_STATE_PRESSED]; 1393 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1394 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1395 | VIEW_STATE_PRESSED]; 1396 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1397 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1398 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1399 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1400 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1401 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1402 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1403 | VIEW_STATE_PRESSED]; 1404 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1405 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1406 | VIEW_STATE_PRESSED]; 1407 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1408 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1409 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1410 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1412 | VIEW_STATE_PRESSED]; 1413 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1415 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1416 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1418 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1419 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1420 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1421 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1422 | VIEW_STATE_PRESSED]; 1423 } 1424 1425 /** 1426 * Used by views that contain lists of items. This state indicates that 1427 * the view is showing the last item. 1428 * @hide 1429 */ 1430 protected static final int[] LAST_STATE_SET = {R.attr.state_last}; 1431 /** 1432 * Used by views that contain lists of items. This state indicates that 1433 * the view is showing the first item. 1434 * @hide 1435 */ 1436 protected static final int[] FIRST_STATE_SET = {R.attr.state_first}; 1437 /** 1438 * Used by views that contain lists of items. This state indicates that 1439 * the view is showing the middle item. 1440 * @hide 1441 */ 1442 protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle}; 1443 /** 1444 * Used by views that contain lists of items. This state indicates that 1445 * the view is showing only one item. 1446 * @hide 1447 */ 1448 protected static final int[] SINGLE_STATE_SET = {R.attr.state_single}; 1449 /** 1450 * Used by views that contain lists of items. This state indicates that 1451 * the view is pressed and showing the last item. 1452 * @hide 1453 */ 1454 protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed}; 1455 /** 1456 * Used by views that contain lists of items. This state indicates that 1457 * the view is pressed and showing the first item. 1458 * @hide 1459 */ 1460 protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed}; 1461 /** 1462 * Used by views that contain lists of items. This state indicates that 1463 * the view is pressed and showing the middle item. 1464 * @hide 1465 */ 1466 protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed}; 1467 /** 1468 * Used by views that contain lists of items. This state indicates that 1469 * the view is pressed and showing only one item. 1470 * @hide 1471 */ 1472 protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed}; 1473 1474 /** 1475 * Temporary Rect currently for use in setBackground(). This will probably 1476 * be extended in the future to hold our own class with more than just 1477 * a Rect. :) 1478 */ 1479 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1480 1481 /** 1482 * Map used to store views' tags. 1483 */ 1484 private static WeakHashMap<View, SparseArray<Object>> sTags; 1485 1486 /** 1487 * Lock used to access sTags. 1488 */ 1489 private static final Object sTagsLock = new Object(); 1490 1491 /** 1492 * The animation currently associated with this view. 1493 * @hide 1494 */ 1495 protected Animation mCurrentAnimation = null; 1496 1497 /** 1498 * Width as measured during measure pass. 1499 * {@hide} 1500 */ 1501 @ViewDebug.ExportedProperty(category = "measurement") 1502 /*package*/ int mMeasuredWidth; 1503 1504 /** 1505 * Height as measured during measure pass. 1506 * {@hide} 1507 */ 1508 @ViewDebug.ExportedProperty(category = "measurement") 1509 /*package*/ int mMeasuredHeight; 1510 1511 /** 1512 * The view's identifier. 1513 * {@hide} 1514 * 1515 * @see #setId(int) 1516 * @see #getId() 1517 */ 1518 @ViewDebug.ExportedProperty(resolveId = true) 1519 int mID = NO_ID; 1520 1521 /** 1522 * The view's tag. 1523 * {@hide} 1524 * 1525 * @see #setTag(Object) 1526 * @see #getTag() 1527 */ 1528 protected Object mTag; 1529 1530 // for mPrivateFlags: 1531 /** {@hide} */ 1532 static final int WANTS_FOCUS = 0x00000001; 1533 /** {@hide} */ 1534 static final int FOCUSED = 0x00000002; 1535 /** {@hide} */ 1536 static final int SELECTED = 0x00000004; 1537 /** {@hide} */ 1538 static final int IS_ROOT_NAMESPACE = 0x00000008; 1539 /** {@hide} */ 1540 static final int HAS_BOUNDS = 0x00000010; 1541 /** {@hide} */ 1542 static final int DRAWN = 0x00000020; 1543 /** 1544 * When this flag is set, this view is running an animation on behalf of its 1545 * children and should therefore not cancel invalidate requests, even if they 1546 * lie outside of this view's bounds. 1547 * 1548 * {@hide} 1549 */ 1550 static final int DRAW_ANIMATION = 0x00000040; 1551 /** {@hide} */ 1552 static final int SKIP_DRAW = 0x00000080; 1553 /** {@hide} */ 1554 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1555 /** {@hide} */ 1556 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1557 /** {@hide} */ 1558 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1559 /** {@hide} */ 1560 static final int MEASURED_DIMENSION_SET = 0x00000800; 1561 /** {@hide} */ 1562 static final int FORCE_LAYOUT = 0x00001000; 1563 /** {@hide} */ 1564 static final int LAYOUT_REQUIRED = 0x00002000; 1565 1566 private static final int PRESSED = 0x00004000; 1567 1568 /** {@hide} */ 1569 static final int DRAWING_CACHE_VALID = 0x00008000; 1570 /** 1571 * Flag used to indicate that this view should be drawn once more (and only once 1572 * more) after its animation has completed. 1573 * {@hide} 1574 */ 1575 static final int ANIMATION_STARTED = 0x00010000; 1576 1577 private static final int SAVE_STATE_CALLED = 0x00020000; 1578 1579 /** 1580 * Indicates that the View returned true when onSetAlpha() was called and that 1581 * the alpha must be restored. 1582 * {@hide} 1583 */ 1584 static final int ALPHA_SET = 0x00040000; 1585 1586 /** 1587 * Set by {@link #setScrollContainer(boolean)}. 1588 */ 1589 static final int SCROLL_CONTAINER = 0x00080000; 1590 1591 /** 1592 * Set by {@link #setScrollContainer(boolean)}. 1593 */ 1594 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1595 1596 /** 1597 * View flag indicating whether this view was invalidated (fully or partially.) 1598 * 1599 * @hide 1600 */ 1601 static final int DIRTY = 0x00200000; 1602 1603 /** 1604 * View flag indicating whether this view was invalidated by an opaque 1605 * invalidate request. 1606 * 1607 * @hide 1608 */ 1609 static final int DIRTY_OPAQUE = 0x00400000; 1610 1611 /** 1612 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1613 * 1614 * @hide 1615 */ 1616 static final int DIRTY_MASK = 0x00600000; 1617 1618 /** 1619 * Indicates whether the background is opaque. 1620 * 1621 * @hide 1622 */ 1623 static final int OPAQUE_BACKGROUND = 0x00800000; 1624 1625 /** 1626 * Indicates whether the scrollbars are opaque. 1627 * 1628 * @hide 1629 */ 1630 static final int OPAQUE_SCROLLBARS = 0x01000000; 1631 1632 /** 1633 * Indicates whether the view is opaque. 1634 * 1635 * @hide 1636 */ 1637 static final int OPAQUE_MASK = 0x01800000; 1638 1639 /** 1640 * Indicates a prepressed state; 1641 * the short time between ACTION_DOWN and recognizing 1642 * a 'real' press. Prepressed is used to recognize quick taps 1643 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1644 * 1645 * @hide 1646 */ 1647 private static final int PREPRESSED = 0x02000000; 1648 1649 /** 1650 * Indicates whether the view is temporarily detached. 1651 * 1652 * @hide 1653 */ 1654 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1655 1656 /** 1657 * Indicates that we should awaken scroll bars once attached 1658 * 1659 * @hide 1660 */ 1661 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1662 1663 /** 1664 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1665 * for transform operations 1666 * 1667 * @hide 1668 */ 1669 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1670 1671 /** {@hide} */ 1672 static final int ACTIVATED = 0x40000000; 1673 1674 /** 1675 * Always allow a user to over-scroll this view, provided it is a 1676 * view that can scroll. 1677 * 1678 * @see #getOverScrollMode() 1679 * @see #setOverScrollMode(int) 1680 */ 1681 public static final int OVER_SCROLL_ALWAYS = 0; 1682 1683 /** 1684 * Allow a user to over-scroll this view only if the content is large 1685 * enough to meaningfully scroll, provided it is a view that can scroll. 1686 * 1687 * @see #getOverScrollMode() 1688 * @see #setOverScrollMode(int) 1689 */ 1690 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1691 1692 /** 1693 * Never allow a user to over-scroll this view. 1694 * 1695 * @see #getOverScrollMode() 1696 * @see #setOverScrollMode(int) 1697 */ 1698 public static final int OVER_SCROLL_NEVER = 2; 1699 1700 /** 1701 * Controls the over-scroll mode for this view. 1702 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1703 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1704 * and {@link #OVER_SCROLL_NEVER}. 1705 */ 1706 private int mOverScrollMode; 1707 1708 /** 1709 * The parent this view is attached to. 1710 * {@hide} 1711 * 1712 * @see #getParent() 1713 */ 1714 protected ViewParent mParent; 1715 1716 /** 1717 * {@hide} 1718 */ 1719 AttachInfo mAttachInfo; 1720 1721 /** 1722 * {@hide} 1723 */ 1724 @ViewDebug.ExportedProperty(flagMapping = { 1725 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1726 name = "FORCE_LAYOUT"), 1727 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1728 name = "LAYOUT_REQUIRED"), 1729 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1730 name = "DRAWING_CACHE_INVALID", outputIf = false), 1731 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1732 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1733 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1734 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1735 }) 1736 int mPrivateFlags; 1737 1738 /** 1739 * Count of how many windows this view has been attached to. 1740 */ 1741 int mWindowAttachCount; 1742 1743 /** 1744 * The layout parameters associated with this view and used by the parent 1745 * {@link android.view.ViewGroup} to determine how this view should be 1746 * laid out. 1747 * {@hide} 1748 */ 1749 protected ViewGroup.LayoutParams mLayoutParams; 1750 1751 /** 1752 * The view flags hold various views states. 1753 * {@hide} 1754 */ 1755 @ViewDebug.ExportedProperty 1756 int mViewFlags; 1757 1758 /** 1759 * The transform matrix for the View. This transform is calculated internally 1760 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1761 * is used by default. Do *not* use this variable directly; instead call 1762 * getMatrix(), which will automatically recalculate the matrix if necessary 1763 * to get the correct matrix based on the latest rotation and scale properties. 1764 */ 1765 private final Matrix mMatrix = new Matrix(); 1766 1767 /** 1768 * The transform matrix for the View. This transform is calculated internally 1769 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1770 * is used by default. Do *not* use this variable directly; instead call 1771 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1772 * to get the correct matrix based on the latest rotation and scale properties. 1773 */ 1774 private Matrix mInverseMatrix; 1775 1776 /** 1777 * An internal variable that tracks whether we need to recalculate the 1778 * transform matrix, based on whether the rotation or scaleX/Y properties 1779 * have changed since the matrix was last calculated. 1780 */ 1781 private boolean mMatrixDirty = false; 1782 1783 /** 1784 * An internal variable that tracks whether we need to recalculate the 1785 * transform matrix, based on whether the rotation or scaleX/Y properties 1786 * have changed since the matrix was last calculated. 1787 */ 1788 private boolean mInverseMatrixDirty = true; 1789 1790 /** 1791 * A variable that tracks whether we need to recalculate the 1792 * transform matrix, based on whether the rotation or scaleX/Y properties 1793 * have changed since the matrix was last calculated. This variable 1794 * is only valid after a call to updateMatrix() or to a function that 1795 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1796 */ 1797 private boolean mMatrixIsIdentity = true; 1798 1799 /** 1800 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1801 */ 1802 private Camera mCamera = null; 1803 1804 /** 1805 * This matrix is used when computing the matrix for 3D rotations. 1806 */ 1807 private Matrix matrix3D = null; 1808 1809 /** 1810 * These prev values are used to recalculate a centered pivot point when necessary. The 1811 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1812 * set), so thes values are only used then as well. 1813 */ 1814 private int mPrevWidth = -1; 1815 private int mPrevHeight = -1; 1816 1817 /** 1818 * Convenience value to check for float values that are close enough to zero to be considered 1819 * zero. 1820 */ 1821 private static final float NONZERO_EPSILON = .001f; 1822 1823 /** 1824 * The degrees rotation around the vertical axis through the pivot point. 1825 */ 1826 @ViewDebug.ExportedProperty 1827 private float mRotationY = 0f; 1828 1829 /** 1830 * The degrees rotation around the horizontal axis through the pivot point. 1831 */ 1832 @ViewDebug.ExportedProperty 1833 private float mRotationX = 0f; 1834 1835 /** 1836 * The degrees rotation around the pivot point. 1837 */ 1838 @ViewDebug.ExportedProperty 1839 private float mRotation = 0f; 1840 1841 /** 1842 * The amount of translation of the object away from its left property (post-layout). 1843 */ 1844 @ViewDebug.ExportedProperty 1845 private float mTranslationX = 0f; 1846 1847 /** 1848 * The amount of translation of the object away from its top property (post-layout). 1849 */ 1850 @ViewDebug.ExportedProperty 1851 private float mTranslationY = 0f; 1852 1853 /** 1854 * The amount of scale in the x direction around the pivot point. A 1855 * value of 1 means no scaling is applied. 1856 */ 1857 @ViewDebug.ExportedProperty 1858 private float mScaleX = 1f; 1859 1860 /** 1861 * The amount of scale in the y direction around the pivot point. A 1862 * value of 1 means no scaling is applied. 1863 */ 1864 @ViewDebug.ExportedProperty 1865 private float mScaleY = 1f; 1866 1867 /** 1868 * The amount of scale in the x direction around the pivot point. A 1869 * value of 1 means no scaling is applied. 1870 */ 1871 @ViewDebug.ExportedProperty 1872 private float mPivotX = 0f; 1873 1874 /** 1875 * The amount of scale in the y direction around the pivot point. A 1876 * value of 1 means no scaling is applied. 1877 */ 1878 @ViewDebug.ExportedProperty 1879 private float mPivotY = 0f; 1880 1881 /** 1882 * The opacity of the View. This is a value from 0 to 1, where 0 means 1883 * completely transparent and 1 means completely opaque. 1884 */ 1885 @ViewDebug.ExportedProperty 1886 private float mAlpha = 1f; 1887 1888 /** 1889 * The distance in pixels from the left edge of this view's parent 1890 * to the left edge of this view. 1891 * {@hide} 1892 */ 1893 @ViewDebug.ExportedProperty(category = "layout") 1894 protected int mLeft; 1895 /** 1896 * The distance in pixels from the left edge of this view's parent 1897 * to the right edge of this view. 1898 * {@hide} 1899 */ 1900 @ViewDebug.ExportedProperty(category = "layout") 1901 protected int mRight; 1902 /** 1903 * The distance in pixels from the top edge of this view's parent 1904 * to the top edge of this view. 1905 * {@hide} 1906 */ 1907 @ViewDebug.ExportedProperty(category = "layout") 1908 protected int mTop; 1909 /** 1910 * The distance in pixels from the top edge of this view's parent 1911 * to the bottom edge of this view. 1912 * {@hide} 1913 */ 1914 @ViewDebug.ExportedProperty(category = "layout") 1915 protected int mBottom; 1916 1917 /** 1918 * The offset, in pixels, by which the content of this view is scrolled 1919 * horizontally. 1920 * {@hide} 1921 */ 1922 @ViewDebug.ExportedProperty(category = "scrolling") 1923 protected int mScrollX; 1924 /** 1925 * The offset, in pixels, by which the content of this view is scrolled 1926 * vertically. 1927 * {@hide} 1928 */ 1929 @ViewDebug.ExportedProperty(category = "scrolling") 1930 protected int mScrollY; 1931 1932 /** 1933 * The left padding in pixels, that is the distance in pixels between the 1934 * left edge of this view and the left edge of its content. 1935 * {@hide} 1936 */ 1937 @ViewDebug.ExportedProperty(category = "padding") 1938 protected int mPaddingLeft; 1939 /** 1940 * The right padding in pixels, that is the distance in pixels between the 1941 * right edge of this view and the right edge of its content. 1942 * {@hide} 1943 */ 1944 @ViewDebug.ExportedProperty(category = "padding") 1945 protected int mPaddingRight; 1946 /** 1947 * The top padding in pixels, that is the distance in pixels between the 1948 * top edge of this view and the top edge of its content. 1949 * {@hide} 1950 */ 1951 @ViewDebug.ExportedProperty(category = "padding") 1952 protected int mPaddingTop; 1953 /** 1954 * The bottom padding in pixels, that is the distance in pixels between the 1955 * bottom edge of this view and the bottom edge of its content. 1956 * {@hide} 1957 */ 1958 @ViewDebug.ExportedProperty(category = "padding") 1959 protected int mPaddingBottom; 1960 1961 /** 1962 * Briefly describes the view and is primarily used for accessibility support. 1963 */ 1964 private CharSequence mContentDescription; 1965 1966 /** 1967 * Cache the paddingRight set by the user to append to the scrollbar's size. 1968 */ 1969 @ViewDebug.ExportedProperty(category = "padding") 1970 int mUserPaddingRight; 1971 1972 /** 1973 * Cache the paddingBottom set by the user to append to the scrollbar's size. 1974 */ 1975 @ViewDebug.ExportedProperty(category = "padding") 1976 int mUserPaddingBottom; 1977 1978 /** 1979 * Cache the paddingLeft set by the user to append to the scrollbar's size. 1980 */ 1981 @ViewDebug.ExportedProperty(category = "padding") 1982 int mUserPaddingLeft; 1983 1984 /** 1985 * @hide 1986 */ 1987 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 1988 /** 1989 * @hide 1990 */ 1991 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 1992 1993 private Resources mResources = null; 1994 1995 private Drawable mBGDrawable; 1996 1997 private int mBackgroundResource; 1998 private boolean mBackgroundSizeChanged; 1999 2000 /** 2001 * Listener used to dispatch focus change events. 2002 * This field should be made private, so it is hidden from the SDK. 2003 * {@hide} 2004 */ 2005 protected OnFocusChangeListener mOnFocusChangeListener; 2006 2007 /** 2008 * Listeners for layout change events. 2009 */ 2010 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2011 2012 /** 2013 * Listener used to dispatch click events. 2014 * This field should be made private, so it is hidden from the SDK. 2015 * {@hide} 2016 */ 2017 protected OnClickListener mOnClickListener; 2018 2019 /** 2020 * Listener used to dispatch long click events. 2021 * This field should be made private, so it is hidden from the SDK. 2022 * {@hide} 2023 */ 2024 protected OnLongClickListener mOnLongClickListener; 2025 2026 /** 2027 * Listener used to build the context menu. 2028 * This field should be made private, so it is hidden from the SDK. 2029 * {@hide} 2030 */ 2031 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2032 2033 private OnKeyListener mOnKeyListener; 2034 2035 private OnTouchListener mOnTouchListener; 2036 2037 private OnDragListener mOnDragListener; 2038 2039 /** 2040 * The application environment this view lives in. 2041 * This field should be made private, so it is hidden from the SDK. 2042 * {@hide} 2043 */ 2044 protected Context mContext; 2045 2046 private ScrollabilityCache mScrollCache; 2047 2048 private int[] mDrawableState = null; 2049 2050 private Bitmap mDrawingCache; 2051 private Bitmap mUnscaledDrawingCache; 2052 private DisplayList mDisplayList; 2053 private HardwareLayer mHardwareLayer; 2054 2055 /** 2056 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2057 * the user may specify which view to go to next. 2058 */ 2059 private int mNextFocusLeftId = View.NO_ID; 2060 2061 /** 2062 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2063 * the user may specify which view to go to next. 2064 */ 2065 private int mNextFocusRightId = View.NO_ID; 2066 2067 /** 2068 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2069 * the user may specify which view to go to next. 2070 */ 2071 private int mNextFocusUpId = View.NO_ID; 2072 2073 /** 2074 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2075 * the user may specify which view to go to next. 2076 */ 2077 private int mNextFocusDownId = View.NO_ID; 2078 2079 /** 2080 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2081 * the user may specify which view to go to next. 2082 */ 2083 int mNextFocusForwardId = View.NO_ID; 2084 2085 private CheckForLongPress mPendingCheckForLongPress; 2086 private CheckForTap mPendingCheckForTap = null; 2087 private PerformClick mPerformClick; 2088 2089 private UnsetPressedState mUnsetPressedState; 2090 2091 /** 2092 * Whether the long press's action has been invoked. The tap's action is invoked on the 2093 * up event while a long press is invoked as soon as the long press duration is reached, so 2094 * a long press could be performed before the tap is checked, in which case the tap's action 2095 * should not be invoked. 2096 */ 2097 private boolean mHasPerformedLongPress; 2098 2099 /** 2100 * The minimum height of the view. We'll try our best to have the height 2101 * of this view to at least this amount. 2102 */ 2103 @ViewDebug.ExportedProperty(category = "measurement") 2104 private int mMinHeight; 2105 2106 /** 2107 * The minimum width of the view. We'll try our best to have the width 2108 * of this view to at least this amount. 2109 */ 2110 @ViewDebug.ExportedProperty(category = "measurement") 2111 private int mMinWidth; 2112 2113 /** 2114 * The delegate to handle touch events that are physically in this view 2115 * but should be handled by another view. 2116 */ 2117 private TouchDelegate mTouchDelegate = null; 2118 2119 /** 2120 * Solid color to use as a background when creating the drawing cache. Enables 2121 * the cache to use 16 bit bitmaps instead of 32 bit. 2122 */ 2123 private int mDrawingCacheBackgroundColor = 0; 2124 2125 /** 2126 * Special tree observer used when mAttachInfo is null. 2127 */ 2128 private ViewTreeObserver mFloatingTreeObserver; 2129 2130 /** 2131 * Cache the touch slop from the context that created the view. 2132 */ 2133 private int mTouchSlop; 2134 2135 /** 2136 * Cache drag/drop state 2137 * 2138 */ 2139 boolean mCanAcceptDrop; 2140 2141 /** 2142 * Flag indicating that a drag can cross window boundaries 2143 * @hide 2144 */ 2145 public static final int DRAG_FLAG_GLOBAL = 1; 2146 2147 /** 2148 * Position of the vertical scroll bar. 2149 */ 2150 private int mVerticalScrollbarPosition; 2151 2152 /** 2153 * Position the scroll bar at the default position as determined by the system. 2154 */ 2155 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2156 2157 /** 2158 * Position the scroll bar along the left edge. 2159 */ 2160 public static final int SCROLLBAR_POSITION_LEFT = 1; 2161 2162 /** 2163 * Position the scroll bar along the right edge. 2164 */ 2165 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2166 2167 /** 2168 * Indicates that the view does not have a layer. 2169 * 2170 * @see #getLayerType() 2171 * @see #setLayerType(int, android.graphics.Paint) 2172 * @see #LAYER_TYPE_SOFTWARE 2173 * @see #LAYER_TYPE_HARDWARE 2174 */ 2175 public static final int LAYER_TYPE_NONE = 0; 2176 2177 /** 2178 * <p>Indicates that the view has a software layer. A software layer is backed 2179 * by a bitmap and causes the view to be rendered using Android's software 2180 * rendering pipeline, even if hardware acceleration is enabled.</p> 2181 * 2182 * <p>Software layers have various usages:</p> 2183 * <p>When the application is not using hardware acceleration, a software layer 2184 * is useful to apply a specific color filter and/or blending mode and/or 2185 * translucency to a view and all its children.</p> 2186 * <p>When the application is using hardware acceleration, a software layer 2187 * is useful to render drawing primitives not supported by the hardware 2188 * accelerated pipeline. It can also be used to cache a complex view tree 2189 * into a texture and reduce the complexity of drawing operations. For instance, 2190 * when animating a complex view tree with a translation, a software layer can 2191 * be used to render the view tree only once.</p> 2192 * <p>Software layers should be avoided when the affected view tree updates 2193 * often. Every update will require to re-render the software layer, which can 2194 * potentially be slow (particularly when hardware acceleration is turned on 2195 * since the layer will have to be uploaded into a hardware texture after every 2196 * update.)</p> 2197 * 2198 * @see #getLayerType() 2199 * @see #setLayerType(int, android.graphics.Paint) 2200 * @see #LAYER_TYPE_NONE 2201 * @see #LAYER_TYPE_HARDWARE 2202 */ 2203 public static final int LAYER_TYPE_SOFTWARE = 1; 2204 2205 /** 2206 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2207 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2208 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2209 * rendering pipeline, but only if hardware acceleration is turned on for the 2210 * view hierarchy. When hardware acceleration is turned off, hardware layers 2211 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2212 * 2213 * <p>A hardware layer is useful to apply a specific color filter and/or 2214 * blending mode and/or translucency to a view and all its children.</p> 2215 * <p>A hardware layer can be used to cache a complex view tree into a 2216 * texture and reduce the complexity of drawing operations. For instance, 2217 * when animating a complex view tree with a translation, a hardware layer can 2218 * be used to render the view tree only once.</p> 2219 * <p>A hardware layer can also be used to increase the rendering quality when 2220 * rotation transformations are applied on a view. It can also be used to 2221 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2222 * 2223 * @see #getLayerType() 2224 * @see #setLayerType(int, android.graphics.Paint) 2225 * @see #LAYER_TYPE_NONE 2226 * @see #LAYER_TYPE_SOFTWARE 2227 */ 2228 public static final int LAYER_TYPE_HARDWARE = 2; 2229 2230 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2231 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2232 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2233 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2234 }) 2235 int mLayerType = LAYER_TYPE_NONE; 2236 Paint mLayerPaint; 2237 2238 /** 2239 * Simple constructor to use when creating a view from code. 2240 * 2241 * @param context The Context the view is running in, through which it can 2242 * access the current theme, resources, etc. 2243 */ 2244 public View(Context context) { 2245 mContext = context; 2246 mResources = context != null ? context.getResources() : null; 2247 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2248 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2249 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2250 } 2251 2252 /** 2253 * Constructor that is called when inflating a view from XML. This is called 2254 * when a view is being constructed from an XML file, supplying attributes 2255 * that were specified in the XML file. This version uses a default style of 2256 * 0, so the only attribute values applied are those in the Context's Theme 2257 * and the given AttributeSet. 2258 * 2259 * <p> 2260 * The method onFinishInflate() will be called after all children have been 2261 * added. 2262 * 2263 * @param context The Context the view is running in, through which it can 2264 * access the current theme, resources, etc. 2265 * @param attrs The attributes of the XML tag that is inflating the view. 2266 * @see #View(Context, AttributeSet, int) 2267 */ 2268 public View(Context context, AttributeSet attrs) { 2269 this(context, attrs, 0); 2270 } 2271 2272 /** 2273 * Perform inflation from XML and apply a class-specific base style. This 2274 * constructor of View allows subclasses to use their own base style when 2275 * they are inflating. For example, a Button class's constructor would call 2276 * this version of the super class constructor and supply 2277 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2278 * the theme's button style to modify all of the base view attributes (in 2279 * particular its background) as well as the Button class's attributes. 2280 * 2281 * @param context The Context the view is running in, through which it can 2282 * access the current theme, resources, etc. 2283 * @param attrs The attributes of the XML tag that is inflating the view. 2284 * @param defStyle The default style to apply to this view. If 0, no style 2285 * will be applied (beyond what is included in the theme). This may 2286 * either be an attribute resource, whose value will be retrieved 2287 * from the current theme, or an explicit style resource. 2288 * @see #View(Context, AttributeSet) 2289 */ 2290 public View(Context context, AttributeSet attrs, int defStyle) { 2291 this(context); 2292 2293 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2294 defStyle, 0); 2295 2296 Drawable background = null; 2297 2298 int leftPadding = -1; 2299 int topPadding = -1; 2300 int rightPadding = -1; 2301 int bottomPadding = -1; 2302 2303 int padding = -1; 2304 2305 int viewFlagValues = 0; 2306 int viewFlagMasks = 0; 2307 2308 boolean setScrollContainer = false; 2309 2310 int x = 0; 2311 int y = 0; 2312 2313 float tx = 0; 2314 float ty = 0; 2315 float rotation = 0; 2316 float rotationX = 0; 2317 float rotationY = 0; 2318 float sx = 1f; 2319 float sy = 1f; 2320 boolean transformSet = false; 2321 2322 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2323 2324 int overScrollMode = mOverScrollMode; 2325 final int N = a.getIndexCount(); 2326 for (int i = 0; i < N; i++) { 2327 int attr = a.getIndex(i); 2328 switch (attr) { 2329 case com.android.internal.R.styleable.View_background: 2330 background = a.getDrawable(attr); 2331 break; 2332 case com.android.internal.R.styleable.View_padding: 2333 padding = a.getDimensionPixelSize(attr, -1); 2334 break; 2335 case com.android.internal.R.styleable.View_paddingLeft: 2336 leftPadding = a.getDimensionPixelSize(attr, -1); 2337 break; 2338 case com.android.internal.R.styleable.View_paddingTop: 2339 topPadding = a.getDimensionPixelSize(attr, -1); 2340 break; 2341 case com.android.internal.R.styleable.View_paddingRight: 2342 rightPadding = a.getDimensionPixelSize(attr, -1); 2343 break; 2344 case com.android.internal.R.styleable.View_paddingBottom: 2345 bottomPadding = a.getDimensionPixelSize(attr, -1); 2346 break; 2347 case com.android.internal.R.styleable.View_scrollX: 2348 x = a.getDimensionPixelOffset(attr, 0); 2349 break; 2350 case com.android.internal.R.styleable.View_scrollY: 2351 y = a.getDimensionPixelOffset(attr, 0); 2352 break; 2353 case com.android.internal.R.styleable.View_alpha: 2354 setAlpha(a.getFloat(attr, 1f)); 2355 break; 2356 case com.android.internal.R.styleable.View_transformPivotX: 2357 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2358 break; 2359 case com.android.internal.R.styleable.View_transformPivotY: 2360 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2361 break; 2362 case com.android.internal.R.styleable.View_translationX: 2363 tx = a.getDimensionPixelOffset(attr, 0); 2364 transformSet = true; 2365 break; 2366 case com.android.internal.R.styleable.View_translationY: 2367 ty = a.getDimensionPixelOffset(attr, 0); 2368 transformSet = true; 2369 break; 2370 case com.android.internal.R.styleable.View_rotation: 2371 rotation = a.getFloat(attr, 0); 2372 transformSet = true; 2373 break; 2374 case com.android.internal.R.styleable.View_rotationX: 2375 rotationX = a.getFloat(attr, 0); 2376 transformSet = true; 2377 break; 2378 case com.android.internal.R.styleable.View_rotationY: 2379 rotationY = a.getFloat(attr, 0); 2380 transformSet = true; 2381 break; 2382 case com.android.internal.R.styleable.View_scaleX: 2383 sx = a.getFloat(attr, 1f); 2384 transformSet = true; 2385 break; 2386 case com.android.internal.R.styleable.View_scaleY: 2387 sy = a.getFloat(attr, 1f); 2388 transformSet = true; 2389 break; 2390 case com.android.internal.R.styleable.View_id: 2391 mID = a.getResourceId(attr, NO_ID); 2392 break; 2393 case com.android.internal.R.styleable.View_tag: 2394 mTag = a.getText(attr); 2395 break; 2396 case com.android.internal.R.styleable.View_fitsSystemWindows: 2397 if (a.getBoolean(attr, false)) { 2398 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2399 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2400 } 2401 break; 2402 case com.android.internal.R.styleable.View_focusable: 2403 if (a.getBoolean(attr, false)) { 2404 viewFlagValues |= FOCUSABLE; 2405 viewFlagMasks |= FOCUSABLE_MASK; 2406 } 2407 break; 2408 case com.android.internal.R.styleable.View_focusableInTouchMode: 2409 if (a.getBoolean(attr, false)) { 2410 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2411 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2412 } 2413 break; 2414 case com.android.internal.R.styleable.View_clickable: 2415 if (a.getBoolean(attr, false)) { 2416 viewFlagValues |= CLICKABLE; 2417 viewFlagMasks |= CLICKABLE; 2418 } 2419 break; 2420 case com.android.internal.R.styleable.View_longClickable: 2421 if (a.getBoolean(attr, false)) { 2422 viewFlagValues |= LONG_CLICKABLE; 2423 viewFlagMasks |= LONG_CLICKABLE; 2424 } 2425 break; 2426 case com.android.internal.R.styleable.View_saveEnabled: 2427 if (!a.getBoolean(attr, true)) { 2428 viewFlagValues |= SAVE_DISABLED; 2429 viewFlagMasks |= SAVE_DISABLED_MASK; 2430 } 2431 break; 2432 case com.android.internal.R.styleable.View_duplicateParentState: 2433 if (a.getBoolean(attr, false)) { 2434 viewFlagValues |= DUPLICATE_PARENT_STATE; 2435 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2436 } 2437 break; 2438 case com.android.internal.R.styleable.View_visibility: 2439 final int visibility = a.getInt(attr, 0); 2440 if (visibility != 0) { 2441 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2442 viewFlagMasks |= VISIBILITY_MASK; 2443 } 2444 break; 2445 case com.android.internal.R.styleable.View_drawingCacheQuality: 2446 final int cacheQuality = a.getInt(attr, 0); 2447 if (cacheQuality != 0) { 2448 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2449 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2450 } 2451 break; 2452 case com.android.internal.R.styleable.View_contentDescription: 2453 mContentDescription = a.getString(attr); 2454 break; 2455 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2456 if (!a.getBoolean(attr, true)) { 2457 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2458 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2459 } 2460 break; 2461 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2462 if (!a.getBoolean(attr, true)) { 2463 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2464 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2465 } 2466 break; 2467 case R.styleable.View_scrollbars: 2468 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2469 if (scrollbars != SCROLLBARS_NONE) { 2470 viewFlagValues |= scrollbars; 2471 viewFlagMasks |= SCROLLBARS_MASK; 2472 initializeScrollbars(a); 2473 } 2474 break; 2475 case R.styleable.View_fadingEdge: 2476 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2477 if (fadingEdge != FADING_EDGE_NONE) { 2478 viewFlagValues |= fadingEdge; 2479 viewFlagMasks |= FADING_EDGE_MASK; 2480 initializeFadingEdge(a); 2481 } 2482 break; 2483 case R.styleable.View_scrollbarStyle: 2484 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2485 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2486 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2487 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2488 } 2489 break; 2490 case R.styleable.View_isScrollContainer: 2491 setScrollContainer = true; 2492 if (a.getBoolean(attr, false)) { 2493 setScrollContainer(true); 2494 } 2495 break; 2496 case com.android.internal.R.styleable.View_keepScreenOn: 2497 if (a.getBoolean(attr, false)) { 2498 viewFlagValues |= KEEP_SCREEN_ON; 2499 viewFlagMasks |= KEEP_SCREEN_ON; 2500 } 2501 break; 2502 case R.styleable.View_filterTouchesWhenObscured: 2503 if (a.getBoolean(attr, false)) { 2504 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2505 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2506 } 2507 break; 2508 case R.styleable.View_nextFocusLeft: 2509 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2510 break; 2511 case R.styleable.View_nextFocusRight: 2512 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2513 break; 2514 case R.styleable.View_nextFocusUp: 2515 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2516 break; 2517 case R.styleable.View_nextFocusDown: 2518 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2519 break; 2520 case R.styleable.View_nextFocusForward: 2521 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2522 break; 2523 case R.styleable.View_minWidth: 2524 mMinWidth = a.getDimensionPixelSize(attr, 0); 2525 break; 2526 case R.styleable.View_minHeight: 2527 mMinHeight = a.getDimensionPixelSize(attr, 0); 2528 break; 2529 case R.styleable.View_onClick: 2530 if (context.isRestricted()) { 2531 throw new IllegalStateException("The android:onClick attribute cannot " 2532 + "be used within a restricted context"); 2533 } 2534 2535 final String handlerName = a.getString(attr); 2536 if (handlerName != null) { 2537 setOnClickListener(new OnClickListener() { 2538 private Method mHandler; 2539 2540 public void onClick(View v) { 2541 if (mHandler == null) { 2542 try { 2543 mHandler = getContext().getClass().getMethod(handlerName, 2544 View.class); 2545 } catch (NoSuchMethodException e) { 2546 int id = getId(); 2547 String idText = id == NO_ID ? "" : " with id '" 2548 + getContext().getResources().getResourceEntryName( 2549 id) + "'"; 2550 throw new IllegalStateException("Could not find a method " + 2551 handlerName + "(View) in the activity " 2552 + getContext().getClass() + " for onClick handler" 2553 + " on view " + View.this.getClass() + idText, e); 2554 } 2555 } 2556 2557 try { 2558 mHandler.invoke(getContext(), View.this); 2559 } catch (IllegalAccessException e) { 2560 throw new IllegalStateException("Could not execute non " 2561 + "public method of the activity", e); 2562 } catch (InvocationTargetException e) { 2563 throw new IllegalStateException("Could not execute " 2564 + "method of the activity", e); 2565 } 2566 } 2567 }); 2568 } 2569 break; 2570 case R.styleable.View_overScrollMode: 2571 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2572 break; 2573 case R.styleable.View_verticalScrollbarPosition: 2574 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2575 break; 2576 case R.styleable.View_layerType: 2577 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2578 break; 2579 } 2580 } 2581 2582 setOverScrollMode(overScrollMode); 2583 2584 if (background != null) { 2585 setBackgroundDrawable(background); 2586 } 2587 2588 if (padding >= 0) { 2589 leftPadding = padding; 2590 topPadding = padding; 2591 rightPadding = padding; 2592 bottomPadding = padding; 2593 } 2594 2595 // If the user specified the padding (either with android:padding or 2596 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2597 // use the default padding or the padding from the background drawable 2598 // (stored at this point in mPadding*) 2599 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2600 topPadding >= 0 ? topPadding : mPaddingTop, 2601 rightPadding >= 0 ? rightPadding : mPaddingRight, 2602 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2603 2604 if (viewFlagMasks != 0) { 2605 setFlags(viewFlagValues, viewFlagMasks); 2606 } 2607 2608 // Needs to be called after mViewFlags is set 2609 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2610 recomputePadding(); 2611 } 2612 2613 if (x != 0 || y != 0) { 2614 scrollTo(x, y); 2615 } 2616 2617 if (transformSet) { 2618 setTranslationX(tx); 2619 setTranslationY(ty); 2620 setRotation(rotation); 2621 setRotationX(rotationX); 2622 setRotationY(rotationY); 2623 setScaleX(sx); 2624 setScaleY(sy); 2625 } 2626 2627 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2628 setScrollContainer(true); 2629 } 2630 2631 computeOpaqueFlags(); 2632 2633 a.recycle(); 2634 } 2635 2636 /** 2637 * Non-public constructor for use in testing 2638 */ 2639 View() { 2640 } 2641 2642 /** 2643 * <p> 2644 * Initializes the fading edges from a given set of styled attributes. This 2645 * method should be called by subclasses that need fading edges and when an 2646 * instance of these subclasses is created programmatically rather than 2647 * being inflated from XML. This method is automatically called when the XML 2648 * is inflated. 2649 * </p> 2650 * 2651 * @param a the styled attributes set to initialize the fading edges from 2652 */ 2653 protected void initializeFadingEdge(TypedArray a) { 2654 initScrollCache(); 2655 2656 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2657 R.styleable.View_fadingEdgeLength, 2658 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2659 } 2660 2661 /** 2662 * Returns the size of the vertical faded edges used to indicate that more 2663 * content in this view is visible. 2664 * 2665 * @return The size in pixels of the vertical faded edge or 0 if vertical 2666 * faded edges are not enabled for this view. 2667 * @attr ref android.R.styleable#View_fadingEdgeLength 2668 */ 2669 public int getVerticalFadingEdgeLength() { 2670 if (isVerticalFadingEdgeEnabled()) { 2671 ScrollabilityCache cache = mScrollCache; 2672 if (cache != null) { 2673 return cache.fadingEdgeLength; 2674 } 2675 } 2676 return 0; 2677 } 2678 2679 /** 2680 * Set the size of the faded edge used to indicate that more content in this 2681 * view is available. Will not change whether the fading edge is enabled; use 2682 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2683 * to enable the fading edge for the vertical or horizontal fading edges. 2684 * 2685 * @param length The size in pixels of the faded edge used to indicate that more 2686 * content in this view is visible. 2687 */ 2688 public void setFadingEdgeLength(int length) { 2689 initScrollCache(); 2690 mScrollCache.fadingEdgeLength = length; 2691 } 2692 2693 /** 2694 * Returns the size of the horizontal faded edges used to indicate that more 2695 * content in this view is visible. 2696 * 2697 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2698 * faded edges are not enabled for this view. 2699 * @attr ref android.R.styleable#View_fadingEdgeLength 2700 */ 2701 public int getHorizontalFadingEdgeLength() { 2702 if (isHorizontalFadingEdgeEnabled()) { 2703 ScrollabilityCache cache = mScrollCache; 2704 if (cache != null) { 2705 return cache.fadingEdgeLength; 2706 } 2707 } 2708 return 0; 2709 } 2710 2711 /** 2712 * Returns the width of the vertical scrollbar. 2713 * 2714 * @return The width in pixels of the vertical scrollbar or 0 if there 2715 * is no vertical scrollbar. 2716 */ 2717 public int getVerticalScrollbarWidth() { 2718 ScrollabilityCache cache = mScrollCache; 2719 if (cache != null) { 2720 ScrollBarDrawable scrollBar = cache.scrollBar; 2721 if (scrollBar != null) { 2722 int size = scrollBar.getSize(true); 2723 if (size <= 0) { 2724 size = cache.scrollBarSize; 2725 } 2726 return size; 2727 } 2728 return 0; 2729 } 2730 return 0; 2731 } 2732 2733 /** 2734 * Returns the height of the horizontal scrollbar. 2735 * 2736 * @return The height in pixels of the horizontal scrollbar or 0 if 2737 * there is no horizontal scrollbar. 2738 */ 2739 protected int getHorizontalScrollbarHeight() { 2740 ScrollabilityCache cache = mScrollCache; 2741 if (cache != null) { 2742 ScrollBarDrawable scrollBar = cache.scrollBar; 2743 if (scrollBar != null) { 2744 int size = scrollBar.getSize(false); 2745 if (size <= 0) { 2746 size = cache.scrollBarSize; 2747 } 2748 return size; 2749 } 2750 return 0; 2751 } 2752 return 0; 2753 } 2754 2755 /** 2756 * <p> 2757 * Initializes the scrollbars from a given set of styled attributes. This 2758 * method should be called by subclasses that need scrollbars and when an 2759 * instance of these subclasses is created programmatically rather than 2760 * being inflated from XML. This method is automatically called when the XML 2761 * is inflated. 2762 * </p> 2763 * 2764 * @param a the styled attributes set to initialize the scrollbars from 2765 */ 2766 protected void initializeScrollbars(TypedArray a) { 2767 initScrollCache(); 2768 2769 final ScrollabilityCache scrollabilityCache = mScrollCache; 2770 2771 if (scrollabilityCache.scrollBar == null) { 2772 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2773 } 2774 2775 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2776 2777 if (!fadeScrollbars) { 2778 scrollabilityCache.state = ScrollabilityCache.ON; 2779 } 2780 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2781 2782 2783 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2784 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2785 .getScrollBarFadeDuration()); 2786 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2787 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2788 ViewConfiguration.getScrollDefaultDelay()); 2789 2790 2791 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2792 com.android.internal.R.styleable.View_scrollbarSize, 2793 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2794 2795 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2796 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2797 2798 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2799 if (thumb != null) { 2800 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2801 } 2802 2803 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2804 false); 2805 if (alwaysDraw) { 2806 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2807 } 2808 2809 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2810 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2811 2812 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2813 if (thumb != null) { 2814 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2815 } 2816 2817 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2818 false); 2819 if (alwaysDraw) { 2820 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2821 } 2822 2823 // Re-apply user/background padding so that scrollbar(s) get added 2824 recomputePadding(); 2825 } 2826 2827 /** 2828 * <p> 2829 * Initalizes the scrollability cache if necessary. 2830 * </p> 2831 */ 2832 private void initScrollCache() { 2833 if (mScrollCache == null) { 2834 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2835 } 2836 } 2837 2838 /** 2839 * Set the position of the vertical scroll bar. Should be one of 2840 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 2841 * {@link #SCROLLBAR_POSITION_RIGHT}. 2842 * 2843 * @param position Where the vertical scroll bar should be positioned. 2844 */ 2845 public void setVerticalScrollbarPosition(int position) { 2846 if (mVerticalScrollbarPosition != position) { 2847 mVerticalScrollbarPosition = position; 2848 computeOpaqueFlags(); 2849 recomputePadding(); 2850 } 2851 } 2852 2853 /** 2854 * @return The position where the vertical scroll bar will show, if applicable. 2855 * @see #setVerticalScrollbarPosition(int) 2856 */ 2857 public int getVerticalScrollbarPosition() { 2858 return mVerticalScrollbarPosition; 2859 } 2860 2861 /** 2862 * Register a callback to be invoked when focus of this view changed. 2863 * 2864 * @param l The callback that will run. 2865 */ 2866 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2867 mOnFocusChangeListener = l; 2868 } 2869 2870 /** 2871 * Add a listener that will be called when the bounds of the view change due to 2872 * layout processing. 2873 * 2874 * @param listener The listener that will be called when layout bounds change. 2875 */ 2876 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 2877 if (mOnLayoutChangeListeners == null) { 2878 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 2879 } 2880 mOnLayoutChangeListeners.add(listener); 2881 } 2882 2883 /** 2884 * Remove a listener for layout changes. 2885 * 2886 * @param listener The listener for layout bounds change. 2887 */ 2888 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 2889 if (mOnLayoutChangeListeners == null) { 2890 return; 2891 } 2892 mOnLayoutChangeListeners.remove(listener); 2893 } 2894 2895 /** 2896 * Gets the current list of listeners for layout changes. 2897 */ 2898 public List<OnLayoutChangeListener> getOnLayoutChangeListeners() { 2899 return mOnLayoutChangeListeners; 2900 } 2901 2902 /** 2903 * Returns the focus-change callback registered for this view. 2904 * 2905 * @return The callback, or null if one is not registered. 2906 */ 2907 public OnFocusChangeListener getOnFocusChangeListener() { 2908 return mOnFocusChangeListener; 2909 } 2910 2911 /** 2912 * Register a callback to be invoked when this view is clicked. If this view is not 2913 * clickable, it becomes clickable. 2914 * 2915 * @param l The callback that will run 2916 * 2917 * @see #setClickable(boolean) 2918 */ 2919 public void setOnClickListener(OnClickListener l) { 2920 if (!isClickable()) { 2921 setClickable(true); 2922 } 2923 mOnClickListener = l; 2924 } 2925 2926 /** 2927 * Register a callback to be invoked when this view is clicked and held. If this view is not 2928 * long clickable, it becomes long clickable. 2929 * 2930 * @param l The callback that will run 2931 * 2932 * @see #setLongClickable(boolean) 2933 */ 2934 public void setOnLongClickListener(OnLongClickListener l) { 2935 if (!isLongClickable()) { 2936 setLongClickable(true); 2937 } 2938 mOnLongClickListener = l; 2939 } 2940 2941 /** 2942 * Register a callback to be invoked when the context menu for this view is 2943 * being built. If this view is not long clickable, it becomes long clickable. 2944 * 2945 * @param l The callback that will run 2946 * 2947 */ 2948 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 2949 if (!isLongClickable()) { 2950 setLongClickable(true); 2951 } 2952 mOnCreateContextMenuListener = l; 2953 } 2954 2955 /** 2956 * Call this view's OnClickListener, if it is defined. 2957 * 2958 * @return True there was an assigned OnClickListener that was called, false 2959 * otherwise is returned. 2960 */ 2961 public boolean performClick() { 2962 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 2963 2964 if (mOnClickListener != null) { 2965 playSoundEffect(SoundEffectConstants.CLICK); 2966 mOnClickListener.onClick(this); 2967 return true; 2968 } 2969 2970 return false; 2971 } 2972 2973 /** 2974 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 2975 * OnLongClickListener did not consume the event. 2976 * 2977 * @return True if one of the above receivers consumed the event, false otherwise. 2978 */ 2979 public boolean performLongClick() { 2980 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 2981 2982 boolean handled = false; 2983 if (mOnLongClickListener != null) { 2984 handled = mOnLongClickListener.onLongClick(View.this); 2985 } 2986 if (!handled) { 2987 handled = showContextMenu(); 2988 } 2989 if (handled) { 2990 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 2991 } 2992 return handled; 2993 } 2994 2995 /** 2996 * Bring up the context menu for this view. 2997 * 2998 * @return Whether a context menu was displayed. 2999 */ 3000 public boolean showContextMenu() { 3001 return getParent().showContextMenuForChild(this); 3002 } 3003 3004 /** 3005 * Start an action mode. 3006 * 3007 * @param callback Callback that will control the lifecycle of the action mode 3008 * @return The new action mode if it is started, null otherwise 3009 * 3010 * @see ActionMode 3011 */ 3012 public ActionMode startActionMode(ActionMode.Callback callback) { 3013 return getParent().startActionModeForChild(this, callback); 3014 } 3015 3016 /** 3017 * Register a callback to be invoked when a key is pressed in this view. 3018 * @param l the key listener to attach to this view 3019 */ 3020 public void setOnKeyListener(OnKeyListener l) { 3021 mOnKeyListener = l; 3022 } 3023 3024 /** 3025 * Register a callback to be invoked when a touch event is sent to this view. 3026 * @param l the touch listener to attach to this view 3027 */ 3028 public void setOnTouchListener(OnTouchListener l) { 3029 mOnTouchListener = l; 3030 } 3031 3032 /** 3033 * Register a callback to be invoked when a drag event is sent to this view. 3034 * @param l The drag listener to attach to this view 3035 */ 3036 public void setOnDragListener(OnDragListener l) { 3037 mOnDragListener = l; 3038 } 3039 3040 /** 3041 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 3042 * 3043 * Note: this does not check whether this {@link View} should get focus, it just 3044 * gives it focus no matter what. It should only be called internally by framework 3045 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3046 * 3047 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 3048 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 3049 * focus moved when requestFocus() is called. It may not always 3050 * apply, in which case use the default View.FOCUS_DOWN. 3051 * @param previouslyFocusedRect The rectangle of the view that had focus 3052 * prior in this View's coordinate system. 3053 */ 3054 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3055 if (DBG) { 3056 System.out.println(this + " requestFocus()"); 3057 } 3058 3059 if ((mPrivateFlags & FOCUSED) == 0) { 3060 mPrivateFlags |= FOCUSED; 3061 3062 if (mParent != null) { 3063 mParent.requestChildFocus(this, this); 3064 } 3065 3066 onFocusChanged(true, direction, previouslyFocusedRect); 3067 refreshDrawableState(); 3068 } 3069 } 3070 3071 /** 3072 * Request that a rectangle of this view be visible on the screen, 3073 * scrolling if necessary just enough. 3074 * 3075 * <p>A View should call this if it maintains some notion of which part 3076 * of its content is interesting. For example, a text editing view 3077 * should call this when its cursor moves. 3078 * 3079 * @param rectangle The rectangle. 3080 * @return Whether any parent scrolled. 3081 */ 3082 public boolean requestRectangleOnScreen(Rect rectangle) { 3083 return requestRectangleOnScreen(rectangle, false); 3084 } 3085 3086 /** 3087 * Request that a rectangle of this view be visible on the screen, 3088 * scrolling if necessary just enough. 3089 * 3090 * <p>A View should call this if it maintains some notion of which part 3091 * of its content is interesting. For example, a text editing view 3092 * should call this when its cursor moves. 3093 * 3094 * <p>When <code>immediate</code> is set to true, scrolling will not be 3095 * animated. 3096 * 3097 * @param rectangle The rectangle. 3098 * @param immediate True to forbid animated scrolling, false otherwise 3099 * @return Whether any parent scrolled. 3100 */ 3101 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3102 View child = this; 3103 ViewParent parent = mParent; 3104 boolean scrolled = false; 3105 while (parent != null) { 3106 scrolled |= parent.requestChildRectangleOnScreen(child, 3107 rectangle, immediate); 3108 3109 // offset rect so next call has the rectangle in the 3110 // coordinate system of its direct child. 3111 rectangle.offset(child.getLeft(), child.getTop()); 3112 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3113 3114 if (!(parent instanceof View)) { 3115 break; 3116 } 3117 3118 child = (View) parent; 3119 parent = child.getParent(); 3120 } 3121 return scrolled; 3122 } 3123 3124 /** 3125 * Called when this view wants to give up focus. This will cause 3126 * {@link #onFocusChanged} to be called. 3127 */ 3128 public void clearFocus() { 3129 if (DBG) { 3130 System.out.println(this + " clearFocus()"); 3131 } 3132 3133 if ((mPrivateFlags & FOCUSED) != 0) { 3134 mPrivateFlags &= ~FOCUSED; 3135 3136 if (mParent != null) { 3137 mParent.clearChildFocus(this); 3138 } 3139 3140 onFocusChanged(false, 0, null); 3141 refreshDrawableState(); 3142 } 3143 } 3144 3145 /** 3146 * Called to clear the focus of a view that is about to be removed. 3147 * Doesn't call clearChildFocus, which prevents this view from taking 3148 * focus again before it has been removed from the parent 3149 */ 3150 void clearFocusForRemoval() { 3151 if ((mPrivateFlags & FOCUSED) != 0) { 3152 mPrivateFlags &= ~FOCUSED; 3153 3154 onFocusChanged(false, 0, null); 3155 refreshDrawableState(); 3156 } 3157 } 3158 3159 /** 3160 * Called internally by the view system when a new view is getting focus. 3161 * This is what clears the old focus. 3162 */ 3163 void unFocus() { 3164 if (DBG) { 3165 System.out.println(this + " unFocus()"); 3166 } 3167 3168 if ((mPrivateFlags & FOCUSED) != 0) { 3169 mPrivateFlags &= ~FOCUSED; 3170 3171 onFocusChanged(false, 0, null); 3172 refreshDrawableState(); 3173 } 3174 } 3175 3176 /** 3177 * Returns true if this view has focus iteself, or is the ancestor of the 3178 * view that has focus. 3179 * 3180 * @return True if this view has or contains focus, false otherwise. 3181 */ 3182 @ViewDebug.ExportedProperty(category = "focus") 3183 public boolean hasFocus() { 3184 return (mPrivateFlags & FOCUSED) != 0; 3185 } 3186 3187 /** 3188 * Returns true if this view is focusable or if it contains a reachable View 3189 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3190 * is a View whose parents do not block descendants focus. 3191 * 3192 * Only {@link #VISIBLE} views are considered focusable. 3193 * 3194 * @return True if the view is focusable or if the view contains a focusable 3195 * View, false otherwise. 3196 * 3197 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3198 */ 3199 public boolean hasFocusable() { 3200 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3201 } 3202 3203 /** 3204 * Called by the view system when the focus state of this view changes. 3205 * When the focus change event is caused by directional navigation, direction 3206 * and previouslyFocusedRect provide insight into where the focus is coming from. 3207 * When overriding, be sure to call up through to the super class so that 3208 * the standard focus handling will occur. 3209 * 3210 * @param gainFocus True if the View has focus; false otherwise. 3211 * @param direction The direction focus has moved when requestFocus() 3212 * is called to give this view focus. Values are 3213 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3214 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3215 * It may not always apply, in which case use the default. 3216 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3217 * system, of the previously focused view. If applicable, this will be 3218 * passed in as finer grained information about where the focus is coming 3219 * from (in addition to direction). Will be <code>null</code> otherwise. 3220 */ 3221 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3222 if (gainFocus) { 3223 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3224 } 3225 3226 InputMethodManager imm = InputMethodManager.peekInstance(); 3227 if (!gainFocus) { 3228 if (isPressed()) { 3229 setPressed(false); 3230 } 3231 if (imm != null && mAttachInfo != null 3232 && mAttachInfo.mHasWindowFocus) { 3233 imm.focusOut(this); 3234 } 3235 onFocusLost(); 3236 } else if (imm != null && mAttachInfo != null 3237 && mAttachInfo.mHasWindowFocus) { 3238 imm.focusIn(this); 3239 } 3240 3241 invalidate(); 3242 if (mOnFocusChangeListener != null) { 3243 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3244 } 3245 3246 if (mAttachInfo != null) { 3247 mAttachInfo.mKeyDispatchState.reset(this); 3248 } 3249 } 3250 3251 /** 3252 * {@inheritDoc} 3253 */ 3254 public void sendAccessibilityEvent(int eventType) { 3255 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3256 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3257 } 3258 } 3259 3260 /** 3261 * {@inheritDoc} 3262 */ 3263 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3264 if (!isShown()) { 3265 return; 3266 } 3267 event.setClassName(getClass().getName()); 3268 event.setPackageName(getContext().getPackageName()); 3269 event.setEnabled(isEnabled()); 3270 event.setContentDescription(mContentDescription); 3271 3272 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3273 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3274 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3275 event.setItemCount(focusablesTempList.size()); 3276 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3277 focusablesTempList.clear(); 3278 } 3279 3280 dispatchPopulateAccessibilityEvent(event); 3281 3282 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 3283 } 3284 3285 /** 3286 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 3287 * to be populated. 3288 * 3289 * @param event The event. 3290 * 3291 * @return True if the event population was completed. 3292 */ 3293 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3294 return false; 3295 } 3296 3297 /** 3298 * Gets the {@link View} description. It briefly describes the view and is 3299 * primarily used for accessibility support. Set this property to enable 3300 * better accessibility support for your application. This is especially 3301 * true for views that do not have textual representation (For example, 3302 * ImageButton). 3303 * 3304 * @return The content descriptiopn. 3305 * 3306 * @attr ref android.R.styleable#View_contentDescription 3307 */ 3308 public CharSequence getContentDescription() { 3309 return mContentDescription; 3310 } 3311 3312 /** 3313 * Sets the {@link View} description. It briefly describes the view and is 3314 * primarily used for accessibility support. Set this property to enable 3315 * better accessibility support for your application. This is especially 3316 * true for views that do not have textual representation (For example, 3317 * ImageButton). 3318 * 3319 * @param contentDescription The content description. 3320 * 3321 * @attr ref android.R.styleable#View_contentDescription 3322 */ 3323 public void setContentDescription(CharSequence contentDescription) { 3324 mContentDescription = contentDescription; 3325 } 3326 3327 /** 3328 * Invoked whenever this view loses focus, either by losing window focus or by losing 3329 * focus within its window. This method can be used to clear any state tied to the 3330 * focus. For instance, if a button is held pressed with the trackball and the window 3331 * loses focus, this method can be used to cancel the press. 3332 * 3333 * Subclasses of View overriding this method should always call super.onFocusLost(). 3334 * 3335 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3336 * @see #onWindowFocusChanged(boolean) 3337 * 3338 * @hide pending API council approval 3339 */ 3340 protected void onFocusLost() { 3341 resetPressedState(); 3342 } 3343 3344 private void resetPressedState() { 3345 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3346 return; 3347 } 3348 3349 if (isPressed()) { 3350 setPressed(false); 3351 3352 if (!mHasPerformedLongPress) { 3353 removeLongPressCallback(); 3354 } 3355 } 3356 } 3357 3358 /** 3359 * Returns true if this view has focus 3360 * 3361 * @return True if this view has focus, false otherwise. 3362 */ 3363 @ViewDebug.ExportedProperty(category = "focus") 3364 public boolean isFocused() { 3365 return (mPrivateFlags & FOCUSED) != 0; 3366 } 3367 3368 /** 3369 * Find the view in the hierarchy rooted at this view that currently has 3370 * focus. 3371 * 3372 * @return The view that currently has focus, or null if no focused view can 3373 * be found. 3374 */ 3375 public View findFocus() { 3376 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3377 } 3378 3379 /** 3380 * Change whether this view is one of the set of scrollable containers in 3381 * its window. This will be used to determine whether the window can 3382 * resize or must pan when a soft input area is open -- scrollable 3383 * containers allow the window to use resize mode since the container 3384 * will appropriately shrink. 3385 */ 3386 public void setScrollContainer(boolean isScrollContainer) { 3387 if (isScrollContainer) { 3388 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3389 mAttachInfo.mScrollContainers.add(this); 3390 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3391 } 3392 mPrivateFlags |= SCROLL_CONTAINER; 3393 } else { 3394 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3395 mAttachInfo.mScrollContainers.remove(this); 3396 } 3397 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3398 } 3399 } 3400 3401 /** 3402 * Returns the quality of the drawing cache. 3403 * 3404 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3405 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3406 * 3407 * @see #setDrawingCacheQuality(int) 3408 * @see #setDrawingCacheEnabled(boolean) 3409 * @see #isDrawingCacheEnabled() 3410 * 3411 * @attr ref android.R.styleable#View_drawingCacheQuality 3412 */ 3413 public int getDrawingCacheQuality() { 3414 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3415 } 3416 3417 /** 3418 * Set the drawing cache quality of this view. This value is used only when the 3419 * drawing cache is enabled 3420 * 3421 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3422 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3423 * 3424 * @see #getDrawingCacheQuality() 3425 * @see #setDrawingCacheEnabled(boolean) 3426 * @see #isDrawingCacheEnabled() 3427 * 3428 * @attr ref android.R.styleable#View_drawingCacheQuality 3429 */ 3430 public void setDrawingCacheQuality(int quality) { 3431 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3432 } 3433 3434 /** 3435 * Returns whether the screen should remain on, corresponding to the current 3436 * value of {@link #KEEP_SCREEN_ON}. 3437 * 3438 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3439 * 3440 * @see #setKeepScreenOn(boolean) 3441 * 3442 * @attr ref android.R.styleable#View_keepScreenOn 3443 */ 3444 public boolean getKeepScreenOn() { 3445 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3446 } 3447 3448 /** 3449 * Controls whether the screen should remain on, modifying the 3450 * value of {@link #KEEP_SCREEN_ON}. 3451 * 3452 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3453 * 3454 * @see #getKeepScreenOn() 3455 * 3456 * @attr ref android.R.styleable#View_keepScreenOn 3457 */ 3458 public void setKeepScreenOn(boolean keepScreenOn) { 3459 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3460 } 3461 3462 /** 3463 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3464 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3465 * 3466 * @attr ref android.R.styleable#View_nextFocusLeft 3467 */ 3468 public int getNextFocusLeftId() { 3469 return mNextFocusLeftId; 3470 } 3471 3472 /** 3473 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3474 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3475 * decide automatically. 3476 * 3477 * @attr ref android.R.styleable#View_nextFocusLeft 3478 */ 3479 public void setNextFocusLeftId(int nextFocusLeftId) { 3480 mNextFocusLeftId = nextFocusLeftId; 3481 } 3482 3483 /** 3484 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3485 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3486 * 3487 * @attr ref android.R.styleable#View_nextFocusRight 3488 */ 3489 public int getNextFocusRightId() { 3490 return mNextFocusRightId; 3491 } 3492 3493 /** 3494 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3495 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3496 * decide automatically. 3497 * 3498 * @attr ref android.R.styleable#View_nextFocusRight 3499 */ 3500 public void setNextFocusRightId(int nextFocusRightId) { 3501 mNextFocusRightId = nextFocusRightId; 3502 } 3503 3504 /** 3505 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3506 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3507 * 3508 * @attr ref android.R.styleable#View_nextFocusUp 3509 */ 3510 public int getNextFocusUpId() { 3511 return mNextFocusUpId; 3512 } 3513 3514 /** 3515 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3516 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 3517 * decide automatically. 3518 * 3519 * @attr ref android.R.styleable#View_nextFocusUp 3520 */ 3521 public void setNextFocusUpId(int nextFocusUpId) { 3522 mNextFocusUpId = nextFocusUpId; 3523 } 3524 3525 /** 3526 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3527 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3528 * 3529 * @attr ref android.R.styleable#View_nextFocusDown 3530 */ 3531 public int getNextFocusDownId() { 3532 return mNextFocusDownId; 3533 } 3534 3535 /** 3536 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3537 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 3538 * decide automatically. 3539 * 3540 * @attr ref android.R.styleable#View_nextFocusDown 3541 */ 3542 public void setNextFocusDownId(int nextFocusDownId) { 3543 mNextFocusDownId = nextFocusDownId; 3544 } 3545 3546 /** 3547 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3548 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3549 * 3550 * @attr ref android.R.styleable#View_nextFocusForward 3551 */ 3552 public int getNextFocusForwardId() { 3553 return mNextFocusForwardId; 3554 } 3555 3556 /** 3557 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3558 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 3559 * decide automatically. 3560 * 3561 * @attr ref android.R.styleable#View_nextFocusForward 3562 */ 3563 public void setNextFocusForwardId(int nextFocusForwardId) { 3564 mNextFocusForwardId = nextFocusForwardId; 3565 } 3566 3567 /** 3568 * Returns the visibility of this view and all of its ancestors 3569 * 3570 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3571 */ 3572 public boolean isShown() { 3573 View current = this; 3574 //noinspection ConstantConditions 3575 do { 3576 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3577 return false; 3578 } 3579 ViewParent parent = current.mParent; 3580 if (parent == null) { 3581 return false; // We are not attached to the view root 3582 } 3583 if (!(parent instanceof View)) { 3584 return true; 3585 } 3586 current = (View) parent; 3587 } while (current != null); 3588 3589 return false; 3590 } 3591 3592 /** 3593 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3594 * is set 3595 * 3596 * @param insets Insets for system windows 3597 * 3598 * @return True if this view applied the insets, false otherwise 3599 */ 3600 protected boolean fitSystemWindows(Rect insets) { 3601 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3602 mPaddingLeft = insets.left; 3603 mPaddingTop = insets.top; 3604 mPaddingRight = insets.right; 3605 mPaddingBottom = insets.bottom; 3606 requestLayout(); 3607 return true; 3608 } 3609 return false; 3610 } 3611 3612 /** 3613 * Determine if this view has the FITS_SYSTEM_WINDOWS flag set. 3614 * @return True if window has FITS_SYSTEM_WINDOWS set 3615 * 3616 * @hide 3617 */ 3618 public boolean isFitsSystemWindowsFlagSet() { 3619 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 3620 } 3621 3622 /** 3623 * Returns the visibility status for this view. 3624 * 3625 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3626 * @attr ref android.R.styleable#View_visibility 3627 */ 3628 @ViewDebug.ExportedProperty(mapping = { 3629 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3630 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3631 @ViewDebug.IntToString(from = GONE, to = "GONE") 3632 }) 3633 public int getVisibility() { 3634 return mViewFlags & VISIBILITY_MASK; 3635 } 3636 3637 /** 3638 * Set the enabled state of this view. 3639 * 3640 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3641 * @attr ref android.R.styleable#View_visibility 3642 */ 3643 @RemotableViewMethod 3644 public void setVisibility(int visibility) { 3645 setFlags(visibility, VISIBILITY_MASK); 3646 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3647 } 3648 3649 /** 3650 * Returns the enabled status for this view. The interpretation of the 3651 * enabled state varies by subclass. 3652 * 3653 * @return True if this view is enabled, false otherwise. 3654 */ 3655 @ViewDebug.ExportedProperty 3656 public boolean isEnabled() { 3657 return (mViewFlags & ENABLED_MASK) == ENABLED; 3658 } 3659 3660 /** 3661 * Set the enabled state of this view. The interpretation of the enabled 3662 * state varies by subclass. 3663 * 3664 * @param enabled True if this view is enabled, false otherwise. 3665 */ 3666 @RemotableViewMethod 3667 public void setEnabled(boolean enabled) { 3668 if (enabled == isEnabled()) return; 3669 3670 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3671 3672 /* 3673 * The View most likely has to change its appearance, so refresh 3674 * the drawable state. 3675 */ 3676 refreshDrawableState(); 3677 3678 // Invalidate too, since the default behavior for views is to be 3679 // be drawn at 50% alpha rather than to change the drawable. 3680 invalidate(); 3681 } 3682 3683 /** 3684 * Set whether this view can receive the focus. 3685 * 3686 * Setting this to false will also ensure that this view is not focusable 3687 * in touch mode. 3688 * 3689 * @param focusable If true, this view can receive the focus. 3690 * 3691 * @see #setFocusableInTouchMode(boolean) 3692 * @attr ref android.R.styleable#View_focusable 3693 */ 3694 public void setFocusable(boolean focusable) { 3695 if (!focusable) { 3696 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3697 } 3698 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3699 } 3700 3701 /** 3702 * Set whether this view can receive focus while in touch mode. 3703 * 3704 * Setting this to true will also ensure that this view is focusable. 3705 * 3706 * @param focusableInTouchMode If true, this view can receive the focus while 3707 * in touch mode. 3708 * 3709 * @see #setFocusable(boolean) 3710 * @attr ref android.R.styleable#View_focusableInTouchMode 3711 */ 3712 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3713 // Focusable in touch mode should always be set before the focusable flag 3714 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3715 // which, in touch mode, will not successfully request focus on this view 3716 // because the focusable in touch mode flag is not set 3717 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3718 if (focusableInTouchMode) { 3719 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3720 } 3721 } 3722 3723 /** 3724 * Set whether this view should have sound effects enabled for events such as 3725 * clicking and touching. 3726 * 3727 * <p>You may wish to disable sound effects for a view if you already play sounds, 3728 * for instance, a dial key that plays dtmf tones. 3729 * 3730 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3731 * @see #isSoundEffectsEnabled() 3732 * @see #playSoundEffect(int) 3733 * @attr ref android.R.styleable#View_soundEffectsEnabled 3734 */ 3735 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3736 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3737 } 3738 3739 /** 3740 * @return whether this view should have sound effects enabled for events such as 3741 * clicking and touching. 3742 * 3743 * @see #setSoundEffectsEnabled(boolean) 3744 * @see #playSoundEffect(int) 3745 * @attr ref android.R.styleable#View_soundEffectsEnabled 3746 */ 3747 @ViewDebug.ExportedProperty 3748 public boolean isSoundEffectsEnabled() { 3749 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3750 } 3751 3752 /** 3753 * Set whether this view should have haptic feedback for events such as 3754 * long presses. 3755 * 3756 * <p>You may wish to disable haptic feedback if your view already controls 3757 * its own haptic feedback. 3758 * 3759 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3760 * @see #isHapticFeedbackEnabled() 3761 * @see #performHapticFeedback(int) 3762 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3763 */ 3764 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3765 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3766 } 3767 3768 /** 3769 * @return whether this view should have haptic feedback enabled for events 3770 * long presses. 3771 * 3772 * @see #setHapticFeedbackEnabled(boolean) 3773 * @see #performHapticFeedback(int) 3774 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3775 */ 3776 @ViewDebug.ExportedProperty 3777 public boolean isHapticFeedbackEnabled() { 3778 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3779 } 3780 3781 /** 3782 * If this view doesn't do any drawing on its own, set this flag to 3783 * allow further optimizations. By default, this flag is not set on 3784 * View, but could be set on some View subclasses such as ViewGroup. 3785 * 3786 * Typically, if you override {@link #onDraw} you should clear this flag. 3787 * 3788 * @param willNotDraw whether or not this View draw on its own 3789 */ 3790 public void setWillNotDraw(boolean willNotDraw) { 3791 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3792 } 3793 3794 /** 3795 * Returns whether or not this View draws on its own. 3796 * 3797 * @return true if this view has nothing to draw, false otherwise 3798 */ 3799 @ViewDebug.ExportedProperty(category = "drawing") 3800 public boolean willNotDraw() { 3801 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3802 } 3803 3804 /** 3805 * When a View's drawing cache is enabled, drawing is redirected to an 3806 * offscreen bitmap. Some views, like an ImageView, must be able to 3807 * bypass this mechanism if they already draw a single bitmap, to avoid 3808 * unnecessary usage of the memory. 3809 * 3810 * @param willNotCacheDrawing true if this view does not cache its 3811 * drawing, false otherwise 3812 */ 3813 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3814 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3815 } 3816 3817 /** 3818 * Returns whether or not this View can cache its drawing or not. 3819 * 3820 * @return true if this view does not cache its drawing, false otherwise 3821 */ 3822 @ViewDebug.ExportedProperty(category = "drawing") 3823 public boolean willNotCacheDrawing() { 3824 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3825 } 3826 3827 /** 3828 * Indicates whether this view reacts to click events or not. 3829 * 3830 * @return true if the view is clickable, false otherwise 3831 * 3832 * @see #setClickable(boolean) 3833 * @attr ref android.R.styleable#View_clickable 3834 */ 3835 @ViewDebug.ExportedProperty 3836 public boolean isClickable() { 3837 return (mViewFlags & CLICKABLE) == CLICKABLE; 3838 } 3839 3840 /** 3841 * Enables or disables click events for this view. When a view 3842 * is clickable it will change its state to "pressed" on every click. 3843 * Subclasses should set the view clickable to visually react to 3844 * user's clicks. 3845 * 3846 * @param clickable true to make the view clickable, false otherwise 3847 * 3848 * @see #isClickable() 3849 * @attr ref android.R.styleable#View_clickable 3850 */ 3851 public void setClickable(boolean clickable) { 3852 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3853 } 3854 3855 /** 3856 * Indicates whether this view reacts to long click events or not. 3857 * 3858 * @return true if the view is long clickable, false otherwise 3859 * 3860 * @see #setLongClickable(boolean) 3861 * @attr ref android.R.styleable#View_longClickable 3862 */ 3863 public boolean isLongClickable() { 3864 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 3865 } 3866 3867 /** 3868 * Enables or disables long click events for this view. When a view is long 3869 * clickable it reacts to the user holding down the button for a longer 3870 * duration than a tap. This event can either launch the listener or a 3871 * context menu. 3872 * 3873 * @param longClickable true to make the view long clickable, false otherwise 3874 * @see #isLongClickable() 3875 * @attr ref android.R.styleable#View_longClickable 3876 */ 3877 public void setLongClickable(boolean longClickable) { 3878 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 3879 } 3880 3881 /** 3882 * Sets the pressed state for this view. 3883 * 3884 * @see #isClickable() 3885 * @see #setClickable(boolean) 3886 * 3887 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 3888 * the View's internal state from a previously set "pressed" state. 3889 */ 3890 public void setPressed(boolean pressed) { 3891 if (pressed) { 3892 mPrivateFlags |= PRESSED; 3893 } else { 3894 mPrivateFlags &= ~PRESSED; 3895 } 3896 refreshDrawableState(); 3897 dispatchSetPressed(pressed); 3898 } 3899 3900 /** 3901 * Dispatch setPressed to all of this View's children. 3902 * 3903 * @see #setPressed(boolean) 3904 * 3905 * @param pressed The new pressed state 3906 */ 3907 protected void dispatchSetPressed(boolean pressed) { 3908 } 3909 3910 /** 3911 * Indicates whether the view is currently in pressed state. Unless 3912 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 3913 * the pressed state. 3914 * 3915 * @see #setPressed 3916 * @see #isClickable() 3917 * @see #setClickable(boolean) 3918 * 3919 * @return true if the view is currently pressed, false otherwise 3920 */ 3921 public boolean isPressed() { 3922 return (mPrivateFlags & PRESSED) == PRESSED; 3923 } 3924 3925 /** 3926 * Indicates whether this view will save its state (that is, 3927 * whether its {@link #onSaveInstanceState} method will be called). 3928 * 3929 * @return Returns true if the view state saving is enabled, else false. 3930 * 3931 * @see #setSaveEnabled(boolean) 3932 * @attr ref android.R.styleable#View_saveEnabled 3933 */ 3934 public boolean isSaveEnabled() { 3935 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 3936 } 3937 3938 /** 3939 * Controls whether the saving of this view's state is 3940 * enabled (that is, whether its {@link #onSaveInstanceState} method 3941 * will be called). Note that even if freezing is enabled, the 3942 * view still must have an id assigned to it (via {@link #setId setId()}) 3943 * for its state to be saved. This flag can only disable the 3944 * saving of this view; any child views may still have their state saved. 3945 * 3946 * @param enabled Set to false to <em>disable</em> state saving, or true 3947 * (the default) to allow it. 3948 * 3949 * @see #isSaveEnabled() 3950 * @see #setId(int) 3951 * @see #onSaveInstanceState() 3952 * @attr ref android.R.styleable#View_saveEnabled 3953 */ 3954 public void setSaveEnabled(boolean enabled) { 3955 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 3956 } 3957 3958 /** 3959 * Gets whether the framework should discard touches when the view's 3960 * window is obscured by another visible window. 3961 * Refer to the {@link View} security documentation for more details. 3962 * 3963 * @return True if touch filtering is enabled. 3964 * 3965 * @see #setFilterTouchesWhenObscured(boolean) 3966 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3967 */ 3968 @ViewDebug.ExportedProperty 3969 public boolean getFilterTouchesWhenObscured() { 3970 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 3971 } 3972 3973 /** 3974 * Sets whether the framework should discard touches when the view's 3975 * window is obscured by another visible window. 3976 * Refer to the {@link View} security documentation for more details. 3977 * 3978 * @param enabled True if touch filtering should be enabled. 3979 * 3980 * @see #getFilterTouchesWhenObscured 3981 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3982 */ 3983 public void setFilterTouchesWhenObscured(boolean enabled) { 3984 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 3985 FILTER_TOUCHES_WHEN_OBSCURED); 3986 } 3987 3988 /** 3989 * Indicates whether the entire hierarchy under this view will save its 3990 * state when a state saving traversal occurs from its parent. The default 3991 * is true; if false, these views will not be saved unless 3992 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 3993 * 3994 * @return Returns true if the view state saving from parent is enabled, else false. 3995 * 3996 * @see #setSaveFromParentEnabled(boolean) 3997 */ 3998 public boolean isSaveFromParentEnabled() { 3999 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4000 } 4001 4002 /** 4003 * Controls whether the entire hierarchy under this view will save its 4004 * state when a state saving traversal occurs from its parent. The default 4005 * is true; if false, these views will not be saved unless 4006 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4007 * 4008 * @param enabled Set to false to <em>disable</em> state saving, or true 4009 * (the default) to allow it. 4010 * 4011 * @see #isSaveFromParentEnabled() 4012 * @see #setId(int) 4013 * @see #onSaveInstanceState() 4014 */ 4015 public void setSaveFromParentEnabled(boolean enabled) { 4016 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4017 } 4018 4019 4020 /** 4021 * Returns whether this View is able to take focus. 4022 * 4023 * @return True if this view can take focus, or false otherwise. 4024 * @attr ref android.R.styleable#View_focusable 4025 */ 4026 @ViewDebug.ExportedProperty(category = "focus") 4027 public final boolean isFocusable() { 4028 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4029 } 4030 4031 /** 4032 * When a view is focusable, it may not want to take focus when in touch mode. 4033 * For example, a button would like focus when the user is navigating via a D-pad 4034 * so that the user can click on it, but once the user starts touching the screen, 4035 * the button shouldn't take focus 4036 * @return Whether the view is focusable in touch mode. 4037 * @attr ref android.R.styleable#View_focusableInTouchMode 4038 */ 4039 @ViewDebug.ExportedProperty 4040 public final boolean isFocusableInTouchMode() { 4041 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4042 } 4043 4044 /** 4045 * Find the nearest view in the specified direction that can take focus. 4046 * This does not actually give focus to that view. 4047 * 4048 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4049 * 4050 * @return The nearest focusable in the specified direction, or null if none 4051 * can be found. 4052 */ 4053 public View focusSearch(int direction) { 4054 if (mParent != null) { 4055 return mParent.focusSearch(this, direction); 4056 } else { 4057 return null; 4058 } 4059 } 4060 4061 /** 4062 * This method is the last chance for the focused view and its ancestors to 4063 * respond to an arrow key. This is called when the focused view did not 4064 * consume the key internally, nor could the view system find a new view in 4065 * the requested direction to give focus to. 4066 * 4067 * @param focused The currently focused view. 4068 * @param direction The direction focus wants to move. One of FOCUS_UP, 4069 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4070 * @return True if the this view consumed this unhandled move. 4071 */ 4072 public boolean dispatchUnhandledMove(View focused, int direction) { 4073 return false; 4074 } 4075 4076 /** 4077 * If a user manually specified the next view id for a particular direction, 4078 * use the root to look up the view. 4079 * @param root The root view of the hierarchy containing this view. 4080 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4081 * or FOCUS_BACKWARD. 4082 * @return The user specified next view, or null if there is none. 4083 */ 4084 View findUserSetNextFocus(View root, int direction) { 4085 switch (direction) { 4086 case FOCUS_LEFT: 4087 if (mNextFocusLeftId == View.NO_ID) return null; 4088 return findViewShouldExist(root, mNextFocusLeftId); 4089 case FOCUS_RIGHT: 4090 if (mNextFocusRightId == View.NO_ID) return null; 4091 return findViewShouldExist(root, mNextFocusRightId); 4092 case FOCUS_UP: 4093 if (mNextFocusUpId == View.NO_ID) return null; 4094 return findViewShouldExist(root, mNextFocusUpId); 4095 case FOCUS_DOWN: 4096 if (mNextFocusDownId == View.NO_ID) return null; 4097 return findViewShouldExist(root, mNextFocusDownId); 4098 case FOCUS_FORWARD: 4099 if (mNextFocusForwardId == View.NO_ID) return null; 4100 return findViewShouldExist(root, mNextFocusForwardId); 4101 case FOCUS_BACKWARD: { 4102 final int id = mID; 4103 return root.findViewByPredicate(new Predicate<View>() { 4104 @Override 4105 public boolean apply(View t) { 4106 return t.mNextFocusForwardId == id; 4107 } 4108 }); 4109 } 4110 } 4111 return null; 4112 } 4113 4114 private static View findViewShouldExist(View root, int childViewId) { 4115 View result = root.findViewById(childViewId); 4116 if (result == null) { 4117 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4118 + "by user for id " + childViewId); 4119 } 4120 return result; 4121 } 4122 4123 /** 4124 * Find and return all focusable views that are descendants of this view, 4125 * possibly including this view if it is focusable itself. 4126 * 4127 * @param direction The direction of the focus 4128 * @return A list of focusable views 4129 */ 4130 public ArrayList<View> getFocusables(int direction) { 4131 ArrayList<View> result = new ArrayList<View>(24); 4132 addFocusables(result, direction); 4133 return result; 4134 } 4135 4136 /** 4137 * Add any focusable views that are descendants of this view (possibly 4138 * including this view if it is focusable itself) to views. If we are in touch mode, 4139 * only add views that are also focusable in touch mode. 4140 * 4141 * @param views Focusable views found so far 4142 * @param direction The direction of the focus 4143 */ 4144 public void addFocusables(ArrayList<View> views, int direction) { 4145 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4146 } 4147 4148 /** 4149 * Adds any focusable views that are descendants of this view (possibly 4150 * including this view if it is focusable itself) to views. This method 4151 * adds all focusable views regardless if we are in touch mode or 4152 * only views focusable in touch mode if we are in touch mode depending on 4153 * the focusable mode paramater. 4154 * 4155 * @param views Focusable views found so far or null if all we are interested is 4156 * the number of focusables. 4157 * @param direction The direction of the focus. 4158 * @param focusableMode The type of focusables to be added. 4159 * 4160 * @see #FOCUSABLES_ALL 4161 * @see #FOCUSABLES_TOUCH_MODE 4162 */ 4163 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4164 if (!isFocusable()) { 4165 return; 4166 } 4167 4168 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4169 isInTouchMode() && !isFocusableInTouchMode()) { 4170 return; 4171 } 4172 4173 if (views != null) { 4174 views.add(this); 4175 } 4176 } 4177 4178 /** 4179 * Find and return all touchable views that are descendants of this view, 4180 * possibly including this view if it is touchable itself. 4181 * 4182 * @return A list of touchable views 4183 */ 4184 public ArrayList<View> getTouchables() { 4185 ArrayList<View> result = new ArrayList<View>(); 4186 addTouchables(result); 4187 return result; 4188 } 4189 4190 /** 4191 * Add any touchable views that are descendants of this view (possibly 4192 * including this view if it is touchable itself) to views. 4193 * 4194 * @param views Touchable views found so far 4195 */ 4196 public void addTouchables(ArrayList<View> views) { 4197 final int viewFlags = mViewFlags; 4198 4199 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4200 && (viewFlags & ENABLED_MASK) == ENABLED) { 4201 views.add(this); 4202 } 4203 } 4204 4205 /** 4206 * Call this to try to give focus to a specific view or to one of its 4207 * descendants. 4208 * 4209 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4210 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4211 * while the device is in touch mode. 4212 * 4213 * See also {@link #focusSearch}, which is what you call to say that you 4214 * have focus, and you want your parent to look for the next one. 4215 * 4216 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4217 * {@link #FOCUS_DOWN} and <code>null</code>. 4218 * 4219 * @return Whether this view or one of its descendants actually took focus. 4220 */ 4221 public final boolean requestFocus() { 4222 return requestFocus(View.FOCUS_DOWN); 4223 } 4224 4225 4226 /** 4227 * Call this to try to give focus to a specific view or to one of its 4228 * descendants and give it a hint about what direction focus is heading. 4229 * 4230 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4231 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4232 * while the device is in touch mode. 4233 * 4234 * See also {@link #focusSearch}, which is what you call to say that you 4235 * have focus, and you want your parent to look for the next one. 4236 * 4237 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4238 * <code>null</code> set for the previously focused rectangle. 4239 * 4240 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4241 * @return Whether this view or one of its descendants actually took focus. 4242 */ 4243 public final boolean requestFocus(int direction) { 4244 return requestFocus(direction, null); 4245 } 4246 4247 /** 4248 * Call this to try to give focus to a specific view or to one of its descendants 4249 * and give it hints about the direction and a specific rectangle that the focus 4250 * is coming from. The rectangle can help give larger views a finer grained hint 4251 * about where focus is coming from, and therefore, where to show selection, or 4252 * forward focus change internally. 4253 * 4254 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4255 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4256 * while the device is in touch mode. 4257 * 4258 * A View will not take focus if it is not visible. 4259 * 4260 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 4261 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4262 * 4263 * See also {@link #focusSearch}, which is what you call to say that you 4264 * have focus, and you want your parent to look for the next one. 4265 * 4266 * You may wish to override this method if your custom {@link View} has an internal 4267 * {@link View} that it wishes to forward the request to. 4268 * 4269 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4270 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4271 * to give a finer grained hint about where focus is coming from. May be null 4272 * if there is no hint. 4273 * @return Whether this view or one of its descendants actually took focus. 4274 */ 4275 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4276 // need to be focusable 4277 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4278 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4279 return false; 4280 } 4281 4282 // need to be focusable in touch mode if in touch mode 4283 if (isInTouchMode() && 4284 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4285 return false; 4286 } 4287 4288 // need to not have any parents blocking us 4289 if (hasAncestorThatBlocksDescendantFocus()) { 4290 return false; 4291 } 4292 4293 handleFocusGainInternal(direction, previouslyFocusedRect); 4294 return true; 4295 } 4296 4297 /** Gets the ViewRoot, or null if not attached. */ 4298 /*package*/ ViewRoot getViewRoot() { 4299 View root = getRootView(); 4300 return root != null ? (ViewRoot)root.getParent() : null; 4301 } 4302 4303 /** 4304 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4305 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4306 * touch mode to request focus when they are touched. 4307 * 4308 * @return Whether this view or one of its descendants actually took focus. 4309 * 4310 * @see #isInTouchMode() 4311 * 4312 */ 4313 public final boolean requestFocusFromTouch() { 4314 // Leave touch mode if we need to 4315 if (isInTouchMode()) { 4316 ViewRoot viewRoot = getViewRoot(); 4317 if (viewRoot != null) { 4318 viewRoot.ensureTouchMode(false); 4319 } 4320 } 4321 return requestFocus(View.FOCUS_DOWN); 4322 } 4323 4324 /** 4325 * @return Whether any ancestor of this view blocks descendant focus. 4326 */ 4327 private boolean hasAncestorThatBlocksDescendantFocus() { 4328 ViewParent ancestor = mParent; 4329 while (ancestor instanceof ViewGroup) { 4330 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4331 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4332 return true; 4333 } else { 4334 ancestor = vgAncestor.getParent(); 4335 } 4336 } 4337 return false; 4338 } 4339 4340 /** 4341 * @hide 4342 */ 4343 public void dispatchStartTemporaryDetach() { 4344 onStartTemporaryDetach(); 4345 } 4346 4347 /** 4348 * This is called when a container is going to temporarily detach a child, with 4349 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4350 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4351 * {@link #onDetachedFromWindow()} when the container is done. 4352 */ 4353 public void onStartTemporaryDetach() { 4354 removeUnsetPressCallback(); 4355 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4356 } 4357 4358 /** 4359 * @hide 4360 */ 4361 public void dispatchFinishTemporaryDetach() { 4362 onFinishTemporaryDetach(); 4363 } 4364 4365 /** 4366 * Called after {@link #onStartTemporaryDetach} when the container is done 4367 * changing the view. 4368 */ 4369 public void onFinishTemporaryDetach() { 4370 } 4371 4372 /** 4373 * capture information of this view for later analysis: developement only 4374 * check dynamic switch to make sure we only dump view 4375 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4376 */ 4377 private static void captureViewInfo(String subTag, View v) { 4378 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4379 return; 4380 } 4381 ViewDebug.dumpCapturedView(subTag, v); 4382 } 4383 4384 /** 4385 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4386 * for this view's window. Returns null if the view is not currently attached 4387 * to the window. Normally you will not need to use this directly, but 4388 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4389 */ 4390 public KeyEvent.DispatcherState getKeyDispatcherState() { 4391 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4392 } 4393 4394 /** 4395 * Dispatch a key event before it is processed by any input method 4396 * associated with the view hierarchy. This can be used to intercept 4397 * key events in special situations before the IME consumes them; a 4398 * typical example would be handling the BACK key to update the application's 4399 * UI instead of allowing the IME to see it and close itself. 4400 * 4401 * @param event The key event to be dispatched. 4402 * @return True if the event was handled, false otherwise. 4403 */ 4404 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4405 return onKeyPreIme(event.getKeyCode(), event); 4406 } 4407 4408 /** 4409 * Dispatch a key event to the next view on the focus path. This path runs 4410 * from the top of the view tree down to the currently focused view. If this 4411 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4412 * the next node down the focus path. This method also fires any key 4413 * listeners. 4414 * 4415 * @param event The key event to be dispatched. 4416 * @return True if the event was handled, false otherwise. 4417 */ 4418 public boolean dispatchKeyEvent(KeyEvent event) { 4419 // If any attached key listener a first crack at the event. 4420 4421 //noinspection SimplifiableIfStatement,deprecation 4422 if (android.util.Config.LOGV) { 4423 captureViewInfo("captureViewKeyEvent", this); 4424 } 4425 4426 //noinspection SimplifiableIfStatement 4427 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4428 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4429 return true; 4430 } 4431 4432 return event.dispatch(this, mAttachInfo != null 4433 ? mAttachInfo.mKeyDispatchState : null, this); 4434 } 4435 4436 /** 4437 * Dispatches a key shortcut event. 4438 * 4439 * @param event The key event to be dispatched. 4440 * @return True if the event was handled by the view, false otherwise. 4441 */ 4442 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4443 return onKeyShortcut(event.getKeyCode(), event); 4444 } 4445 4446 /** 4447 * Pass the touch screen motion event down to the target view, or this 4448 * view if it is the target. 4449 * 4450 * @param event The motion event to be dispatched. 4451 * @return True if the event was handled by the view, false otherwise. 4452 */ 4453 public boolean dispatchTouchEvent(MotionEvent event) { 4454 if (!onFilterTouchEventForSecurity(event)) { 4455 return false; 4456 } 4457 4458 //noinspection SimplifiableIfStatement 4459 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4460 mOnTouchListener.onTouch(this, event)) { 4461 return true; 4462 } 4463 return onTouchEvent(event); 4464 } 4465 4466 /** 4467 * Filter the touch event to apply security policies. 4468 * 4469 * @param event The motion event to be filtered. 4470 * @return True if the event should be dispatched, false if the event should be dropped. 4471 * 4472 * @see #getFilterTouchesWhenObscured 4473 */ 4474 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4475 //noinspection RedundantIfStatement 4476 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4477 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4478 // Window is obscured, drop this touch. 4479 return false; 4480 } 4481 return true; 4482 } 4483 4484 /** 4485 * Pass a trackball motion event down to the focused view. 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 dispatchTrackballEvent(MotionEvent event) { 4491 //Log.i("view", "view=" + this + ", " + event.toString()); 4492 return onTrackballEvent(event); 4493 } 4494 4495 /** 4496 * Pass a generic motion event down to the focused view. 4497 * 4498 * @param event The motion event to be dispatched. 4499 * @return True if the event was handled by the view, false otherwise. 4500 */ 4501 public boolean dispatchGenericMotionEvent(MotionEvent event) { 4502 return onGenericMotionEvent(event); 4503 } 4504 4505 /** 4506 * Called when the window containing this view gains or loses window focus. 4507 * ViewGroups should override to route to their children. 4508 * 4509 * @param hasFocus True if the window containing this view now has focus, 4510 * false otherwise. 4511 */ 4512 public void dispatchWindowFocusChanged(boolean hasFocus) { 4513 onWindowFocusChanged(hasFocus); 4514 } 4515 4516 /** 4517 * Called when the window containing this view gains or loses focus. Note 4518 * that this is separate from view focus: to receive key events, both 4519 * your view and its window must have focus. If a window is displayed 4520 * on top of yours that takes input focus, then your own window will lose 4521 * focus but the view focus will remain unchanged. 4522 * 4523 * @param hasWindowFocus True if the window containing this view now has 4524 * focus, false otherwise. 4525 */ 4526 public void onWindowFocusChanged(boolean hasWindowFocus) { 4527 InputMethodManager imm = InputMethodManager.peekInstance(); 4528 if (!hasWindowFocus) { 4529 if (isPressed()) { 4530 setPressed(false); 4531 } 4532 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4533 imm.focusOut(this); 4534 } 4535 removeLongPressCallback(); 4536 removeTapCallback(); 4537 onFocusLost(); 4538 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4539 imm.focusIn(this); 4540 } 4541 refreshDrawableState(); 4542 } 4543 4544 /** 4545 * Returns true if this view is in a window that currently has window focus. 4546 * Note that this is not the same as the view itself having focus. 4547 * 4548 * @return True if this view is in a window that currently has window focus. 4549 */ 4550 public boolean hasWindowFocus() { 4551 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4552 } 4553 4554 /** 4555 * Dispatch a view visibility change down the view hierarchy. 4556 * ViewGroups should override to route to their children. 4557 * @param changedView The view whose visibility changed. Could be 'this' or 4558 * an ancestor view. 4559 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4560 * {@link #INVISIBLE} or {@link #GONE}. 4561 */ 4562 protected void dispatchVisibilityChanged(View changedView, int visibility) { 4563 onVisibilityChanged(changedView, visibility); 4564 } 4565 4566 /** 4567 * Called when the visibility of the view or an ancestor of the view is changed. 4568 * @param changedView The view whose visibility changed. Could be 'this' or 4569 * an ancestor view. 4570 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4571 * {@link #INVISIBLE} or {@link #GONE}. 4572 */ 4573 protected void onVisibilityChanged(View changedView, int visibility) { 4574 if (visibility == VISIBLE) { 4575 if (mAttachInfo != null) { 4576 initialAwakenScrollBars(); 4577 } else { 4578 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4579 } 4580 } 4581 } 4582 4583 /** 4584 * Dispatch a hint about whether this view is displayed. For instance, when 4585 * a View moves out of the screen, it might receives a display hint indicating 4586 * the view is not displayed. Applications should not <em>rely</em> on this hint 4587 * as there is no guarantee that they will receive one. 4588 * 4589 * @param hint A hint about whether or not this view is displayed: 4590 * {@link #VISIBLE} or {@link #INVISIBLE}. 4591 */ 4592 public void dispatchDisplayHint(int hint) { 4593 onDisplayHint(hint); 4594 } 4595 4596 /** 4597 * Gives this view a hint about whether is displayed or not. For instance, when 4598 * a View moves out of the screen, it might receives a display hint indicating 4599 * the view is not displayed. Applications should not <em>rely</em> on this hint 4600 * as there is no guarantee that they will receive one. 4601 * 4602 * @param hint A hint about whether or not this view is displayed: 4603 * {@link #VISIBLE} or {@link #INVISIBLE}. 4604 */ 4605 protected void onDisplayHint(int hint) { 4606 } 4607 4608 /** 4609 * Dispatch a window visibility change down the view hierarchy. 4610 * ViewGroups should override to route to their children. 4611 * 4612 * @param visibility The new visibility of the window. 4613 * 4614 * @see #onWindowVisibilityChanged 4615 */ 4616 public void dispatchWindowVisibilityChanged(int visibility) { 4617 onWindowVisibilityChanged(visibility); 4618 } 4619 4620 /** 4621 * Called when the window containing has change its visibility 4622 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4623 * that this tells you whether or not your window is being made visible 4624 * to the window manager; this does <em>not</em> tell you whether or not 4625 * your window is obscured by other windows on the screen, even if it 4626 * is itself visible. 4627 * 4628 * @param visibility The new visibility of the window. 4629 */ 4630 protected void onWindowVisibilityChanged(int visibility) { 4631 if (visibility == VISIBLE) { 4632 initialAwakenScrollBars(); 4633 } 4634 } 4635 4636 /** 4637 * Returns the current visibility of the window this view is attached to 4638 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4639 * 4640 * @return Returns the current visibility of the view's window. 4641 */ 4642 public int getWindowVisibility() { 4643 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4644 } 4645 4646 /** 4647 * Retrieve the overall visible display size in which the window this view is 4648 * attached to has been positioned in. This takes into account screen 4649 * decorations above the window, for both cases where the window itself 4650 * is being position inside of them or the window is being placed under 4651 * then and covered insets are used for the window to position its content 4652 * inside. In effect, this tells you the available area where content can 4653 * be placed and remain visible to users. 4654 * 4655 * <p>This function requires an IPC back to the window manager to retrieve 4656 * the requested information, so should not be used in performance critical 4657 * code like drawing. 4658 * 4659 * @param outRect Filled in with the visible display frame. If the view 4660 * is not attached to a window, this is simply the raw display size. 4661 */ 4662 public void getWindowVisibleDisplayFrame(Rect outRect) { 4663 if (mAttachInfo != null) { 4664 try { 4665 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4666 } catch (RemoteException e) { 4667 return; 4668 } 4669 // XXX This is really broken, and probably all needs to be done 4670 // in the window manager, and we need to know more about whether 4671 // we want the area behind or in front of the IME. 4672 final Rect insets = mAttachInfo.mVisibleInsets; 4673 outRect.left += insets.left; 4674 outRect.top += insets.top; 4675 outRect.right -= insets.right; 4676 outRect.bottom -= insets.bottom; 4677 return; 4678 } 4679 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4680 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4681 } 4682 4683 /** 4684 * Dispatch a notification about a resource configuration change down 4685 * the view hierarchy. 4686 * ViewGroups should override to route to their children. 4687 * 4688 * @param newConfig The new resource configuration. 4689 * 4690 * @see #onConfigurationChanged 4691 */ 4692 public void dispatchConfigurationChanged(Configuration newConfig) { 4693 onConfigurationChanged(newConfig); 4694 } 4695 4696 /** 4697 * Called when the current configuration of the resources being used 4698 * by the application have changed. You can use this to decide when 4699 * to reload resources that can changed based on orientation and other 4700 * configuration characterstics. You only need to use this if you are 4701 * not relying on the normal {@link android.app.Activity} mechanism of 4702 * recreating the activity instance upon a configuration change. 4703 * 4704 * @param newConfig The new resource configuration. 4705 */ 4706 protected void onConfigurationChanged(Configuration newConfig) { 4707 } 4708 4709 /** 4710 * Private function to aggregate all per-view attributes in to the view 4711 * root. 4712 */ 4713 void dispatchCollectViewAttributes(int visibility) { 4714 performCollectViewAttributes(visibility); 4715 } 4716 4717 void performCollectViewAttributes(int visibility) { 4718 //noinspection PointlessBitwiseExpression 4719 if (((visibility | mViewFlags) & (VISIBILITY_MASK | KEEP_SCREEN_ON)) 4720 == (VISIBLE | KEEP_SCREEN_ON)) { 4721 mAttachInfo.mKeepScreenOn = true; 4722 } 4723 } 4724 4725 void needGlobalAttributesUpdate(boolean force) { 4726 AttachInfo ai = mAttachInfo; 4727 if (ai != null) { 4728 if (ai.mKeepScreenOn || force) { 4729 ai.mRecomputeGlobalAttributes = true; 4730 } 4731 } 4732 } 4733 4734 /** 4735 * Returns whether the device is currently in touch mode. Touch mode is entered 4736 * once the user begins interacting with the device by touch, and affects various 4737 * things like whether focus is always visible to the user. 4738 * 4739 * @return Whether the device is in touch mode. 4740 */ 4741 @ViewDebug.ExportedProperty 4742 public boolean isInTouchMode() { 4743 if (mAttachInfo != null) { 4744 return mAttachInfo.mInTouchMode; 4745 } else { 4746 return ViewRoot.isInTouchMode(); 4747 } 4748 } 4749 4750 /** 4751 * Returns the context the view is running in, through which it can 4752 * access the current theme, resources, etc. 4753 * 4754 * @return The view's Context. 4755 */ 4756 @ViewDebug.CapturedViewProperty 4757 public final Context getContext() { 4758 return mContext; 4759 } 4760 4761 /** 4762 * Handle a key event before it is processed by any input method 4763 * associated with the view hierarchy. This can be used to intercept 4764 * key events in special situations before the IME consumes them; a 4765 * typical example would be handling the BACK key to update the application's 4766 * UI instead of allowing the IME to see it and close itself. 4767 * 4768 * @param keyCode The value in event.getKeyCode(). 4769 * @param event Description of the key event. 4770 * @return If you handled the event, return true. If you want to allow the 4771 * event to be handled by the next receiver, return false. 4772 */ 4773 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4774 return false; 4775 } 4776 4777 /** 4778 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 4779 * KeyEvent.Callback.onKeyDown()}: perform press of the view 4780 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4781 * is released, if the view is enabled and clickable. 4782 * 4783 * @param keyCode A key code that represents the button pressed, from 4784 * {@link android.view.KeyEvent}. 4785 * @param event The KeyEvent object that defines the button action. 4786 */ 4787 public boolean onKeyDown(int keyCode, KeyEvent event) { 4788 boolean result = false; 4789 4790 switch (keyCode) { 4791 case KeyEvent.KEYCODE_DPAD_CENTER: 4792 case KeyEvent.KEYCODE_ENTER: { 4793 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4794 return true; 4795 } 4796 // Long clickable items don't necessarily have to be clickable 4797 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4798 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4799 (event.getRepeatCount() == 0)) { 4800 setPressed(true); 4801 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4802 postCheckForLongClick(0); 4803 } 4804 return true; 4805 } 4806 break; 4807 } 4808 } 4809 return result; 4810 } 4811 4812 /** 4813 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4814 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4815 * the event). 4816 */ 4817 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 4818 return false; 4819 } 4820 4821 /** 4822 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 4823 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 4824 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 4825 * {@link KeyEvent#KEYCODE_ENTER} is released. 4826 * 4827 * @param keyCode A key code that represents the button pressed, from 4828 * {@link android.view.KeyEvent}. 4829 * @param event The KeyEvent object that defines the button action. 4830 */ 4831 public boolean onKeyUp(int keyCode, KeyEvent event) { 4832 boolean result = false; 4833 4834 switch (keyCode) { 4835 case KeyEvent.KEYCODE_DPAD_CENTER: 4836 case KeyEvent.KEYCODE_ENTER: { 4837 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4838 return true; 4839 } 4840 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 4841 setPressed(false); 4842 4843 if (!mHasPerformedLongPress) { 4844 // This is a tap, so remove the longpress check 4845 removeLongPressCallback(); 4846 4847 result = performClick(); 4848 } 4849 } 4850 break; 4851 } 4852 } 4853 return result; 4854 } 4855 4856 /** 4857 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4858 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 4859 * the event). 4860 * 4861 * @param keyCode A key code that represents the button pressed, from 4862 * {@link android.view.KeyEvent}. 4863 * @param repeatCount The number of times the action was made. 4864 * @param event The KeyEvent object that defines the button action. 4865 */ 4866 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 4867 return false; 4868 } 4869 4870 /** 4871 * Called on the focused view when a key shortcut event is not handled. 4872 * Override this method to implement local key shortcuts for the View. 4873 * Key shortcuts can also be implemented by setting the 4874 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 4875 * 4876 * @param keyCode The value in event.getKeyCode(). 4877 * @param event Description of the key event. 4878 * @return If you handled the event, return true. If you want to allow the 4879 * event to be handled by the next receiver, return false. 4880 */ 4881 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 4882 return false; 4883 } 4884 4885 /** 4886 * Check whether the called view is a text editor, in which case it 4887 * would make sense to automatically display a soft input window for 4888 * it. Subclasses should override this if they implement 4889 * {@link #onCreateInputConnection(EditorInfo)} to return true if 4890 * a call on that method would return a non-null InputConnection, and 4891 * they are really a first-class editor that the user would normally 4892 * start typing on when the go into a window containing your view. 4893 * 4894 * <p>The default implementation always returns false. This does 4895 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 4896 * will not be called or the user can not otherwise perform edits on your 4897 * view; it is just a hint to the system that this is not the primary 4898 * purpose of this view. 4899 * 4900 * @return Returns true if this view is a text editor, else false. 4901 */ 4902 public boolean onCheckIsTextEditor() { 4903 return false; 4904 } 4905 4906 /** 4907 * Create a new InputConnection for an InputMethod to interact 4908 * with the view. The default implementation returns null, since it doesn't 4909 * support input methods. You can override this to implement such support. 4910 * This is only needed for views that take focus and text input. 4911 * 4912 * <p>When implementing this, you probably also want to implement 4913 * {@link #onCheckIsTextEditor()} to indicate you will return a 4914 * non-null InputConnection. 4915 * 4916 * @param outAttrs Fill in with attribute information about the connection. 4917 */ 4918 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 4919 return null; 4920 } 4921 4922 /** 4923 * Called by the {@link android.view.inputmethod.InputMethodManager} 4924 * when a view who is not the current 4925 * input connection target is trying to make a call on the manager. The 4926 * default implementation returns false; you can override this to return 4927 * true for certain views if you are performing InputConnection proxying 4928 * to them. 4929 * @param view The View that is making the InputMethodManager call. 4930 * @return Return true to allow the call, false to reject. 4931 */ 4932 public boolean checkInputConnectionProxy(View view) { 4933 return false; 4934 } 4935 4936 /** 4937 * Show the context menu for this view. It is not safe to hold on to the 4938 * menu after returning from this method. 4939 * 4940 * You should normally not overload this method. Overload 4941 * {@link #onCreateContextMenu(ContextMenu)} or define an 4942 * {@link OnCreateContextMenuListener} to add items to the context menu. 4943 * 4944 * @param menu The context menu to populate 4945 */ 4946 public void createContextMenu(ContextMenu menu) { 4947 ContextMenuInfo menuInfo = getContextMenuInfo(); 4948 4949 // Sets the current menu info so all items added to menu will have 4950 // my extra info set. 4951 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 4952 4953 onCreateContextMenu(menu); 4954 if (mOnCreateContextMenuListener != null) { 4955 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 4956 } 4957 4958 // Clear the extra information so subsequent items that aren't mine don't 4959 // have my extra info. 4960 ((MenuBuilder)menu).setCurrentMenuInfo(null); 4961 4962 if (mParent != null) { 4963 mParent.createContextMenu(menu); 4964 } 4965 } 4966 4967 /** 4968 * Views should implement this if they have extra information to associate 4969 * with the context menu. The return result is supplied as a parameter to 4970 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 4971 * callback. 4972 * 4973 * @return Extra information about the item for which the context menu 4974 * should be shown. This information will vary across different 4975 * subclasses of View. 4976 */ 4977 protected ContextMenuInfo getContextMenuInfo() { 4978 return null; 4979 } 4980 4981 /** 4982 * Views should implement this if the view itself is going to add items to 4983 * the context menu. 4984 * 4985 * @param menu the context menu to populate 4986 */ 4987 protected void onCreateContextMenu(ContextMenu menu) { 4988 } 4989 4990 /** 4991 * Implement this method to handle trackball motion events. The 4992 * <em>relative</em> movement of the trackball since the last event 4993 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 4994 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 4995 * that a movement of 1 corresponds to the user pressing one DPAD key (so 4996 * they will often be fractional values, representing the more fine-grained 4997 * movement information available from a trackball). 4998 * 4999 * @param event The motion event. 5000 * @return True if the event was handled, false otherwise. 5001 */ 5002 public boolean onTrackballEvent(MotionEvent event) { 5003 return false; 5004 } 5005 5006 /** 5007 * Implement this method to handle generic motion events. 5008 * <p> 5009 * Generic motion events are dispatched to the focused view to describe 5010 * the motions of input devices such as joysticks. The 5011 * {@link MotionEvent#getSource() source} of the motion event specifies 5012 * the class of input that was received. Implementations of this method 5013 * must examine the bits in the source before processing the event. 5014 * The following code example shows how this is done. 5015 * </p> 5016 * <code> 5017 * public boolean onGenericMotionEvent(MotionEvent event) { 5018 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 5019 * float x = event.getX(); 5020 * float y = event.getY(); 5021 * // process the joystick motion 5022 * return true; 5023 * } 5024 * return super.onGenericMotionEvent(event); 5025 * } 5026 * </code> 5027 * 5028 * @param event The generic motion event being processed. 5029 * 5030 * @return Return true if you have consumed the event, false if you haven't. 5031 * The default implementation always returns false. 5032 */ 5033 public boolean onGenericMotionEvent(MotionEvent event) { 5034 return false; 5035 } 5036 5037 /** 5038 * Implement this method to handle touch screen motion events. 5039 * 5040 * @param event The motion event. 5041 * @return True if the event was handled, false otherwise. 5042 */ 5043 public boolean onTouchEvent(MotionEvent event) { 5044 final int viewFlags = mViewFlags; 5045 5046 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5047 // A disabled view that is clickable still consumes the touch 5048 // events, it just doesn't respond to them. 5049 return (((viewFlags & CLICKABLE) == CLICKABLE || 5050 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5051 } 5052 5053 if (mTouchDelegate != null) { 5054 if (mTouchDelegate.onTouchEvent(event)) { 5055 return true; 5056 } 5057 } 5058 5059 if (((viewFlags & CLICKABLE) == CLICKABLE || 5060 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5061 switch (event.getAction()) { 5062 case MotionEvent.ACTION_UP: 5063 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5064 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5065 // take focus if we don't have it already and we should in 5066 // touch mode. 5067 boolean focusTaken = false; 5068 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5069 focusTaken = requestFocus(); 5070 } 5071 5072 if (!mHasPerformedLongPress) { 5073 // This is a tap, so remove the longpress check 5074 removeLongPressCallback(); 5075 5076 // Only perform take click actions if we were in the pressed state 5077 if (!focusTaken) { 5078 // Use a Runnable and post this rather than calling 5079 // performClick directly. This lets other visual state 5080 // of the view update before click actions start. 5081 if (mPerformClick == null) { 5082 mPerformClick = new PerformClick(); 5083 } 5084 if (!post(mPerformClick)) { 5085 performClick(); 5086 } 5087 } 5088 } 5089 5090 if (mUnsetPressedState == null) { 5091 mUnsetPressedState = new UnsetPressedState(); 5092 } 5093 5094 if (prepressed) { 5095 mPrivateFlags |= PRESSED; 5096 refreshDrawableState(); 5097 postDelayed(mUnsetPressedState, 5098 ViewConfiguration.getPressedStateDuration()); 5099 } else if (!post(mUnsetPressedState)) { 5100 // If the post failed, unpress right now 5101 mUnsetPressedState.run(); 5102 } 5103 removeTapCallback(); 5104 } 5105 break; 5106 5107 case MotionEvent.ACTION_DOWN: 5108 if (mPendingCheckForTap == null) { 5109 mPendingCheckForTap = new CheckForTap(); 5110 } 5111 mPrivateFlags |= PREPRESSED; 5112 mHasPerformedLongPress = false; 5113 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5114 break; 5115 5116 case MotionEvent.ACTION_CANCEL: 5117 mPrivateFlags &= ~PRESSED; 5118 refreshDrawableState(); 5119 removeTapCallback(); 5120 break; 5121 5122 case MotionEvent.ACTION_MOVE: 5123 final int x = (int) event.getX(); 5124 final int y = (int) event.getY(); 5125 5126 // Be lenient about moving outside of buttons 5127 if (!pointInView(x, y, mTouchSlop)) { 5128 // Outside button 5129 removeTapCallback(); 5130 if ((mPrivateFlags & PRESSED) != 0) { 5131 // Remove any future long press/tap checks 5132 removeLongPressCallback(); 5133 5134 // Need to switch from pressed to not pressed 5135 mPrivateFlags &= ~PRESSED; 5136 refreshDrawableState(); 5137 } 5138 } 5139 break; 5140 } 5141 return true; 5142 } 5143 5144 return false; 5145 } 5146 5147 /** 5148 * Remove the longpress detection timer. 5149 */ 5150 private void removeLongPressCallback() { 5151 if (mPendingCheckForLongPress != null) { 5152 removeCallbacks(mPendingCheckForLongPress); 5153 } 5154 } 5155 5156 /** 5157 * Remove the prepress detection timer. 5158 */ 5159 private void removeUnsetPressCallback() { 5160 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5161 setPressed(false); 5162 removeCallbacks(mUnsetPressedState); 5163 } 5164 } 5165 5166 /** 5167 * Remove the tap detection timer. 5168 */ 5169 private void removeTapCallback() { 5170 if (mPendingCheckForTap != null) { 5171 mPrivateFlags &= ~PREPRESSED; 5172 removeCallbacks(mPendingCheckForTap); 5173 } 5174 } 5175 5176 /** 5177 * Cancels a pending long press. Your subclass can use this if you 5178 * want the context menu to come up if the user presses and holds 5179 * at the same place, but you don't want it to come up if they press 5180 * and then move around enough to cause scrolling. 5181 */ 5182 public void cancelLongPress() { 5183 removeLongPressCallback(); 5184 5185 /* 5186 * The prepressed state handled by the tap callback is a display 5187 * construct, but the tap callback will post a long press callback 5188 * less its own timeout. Remove it here. 5189 */ 5190 removeTapCallback(); 5191 } 5192 5193 /** 5194 * Sets the TouchDelegate for this View. 5195 */ 5196 public void setTouchDelegate(TouchDelegate delegate) { 5197 mTouchDelegate = delegate; 5198 } 5199 5200 /** 5201 * Gets the TouchDelegate for this View. 5202 */ 5203 public TouchDelegate getTouchDelegate() { 5204 return mTouchDelegate; 5205 } 5206 5207 /** 5208 * Set flags controlling behavior of this view. 5209 * 5210 * @param flags Constant indicating the value which should be set 5211 * @param mask Constant indicating the bit range that should be changed 5212 */ 5213 void setFlags(int flags, int mask) { 5214 int old = mViewFlags; 5215 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5216 5217 int changed = mViewFlags ^ old; 5218 if (changed == 0) { 5219 return; 5220 } 5221 int privateFlags = mPrivateFlags; 5222 5223 /* Check if the FOCUSABLE bit has changed */ 5224 if (((changed & FOCUSABLE_MASK) != 0) && 5225 ((privateFlags & HAS_BOUNDS) !=0)) { 5226 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5227 && ((privateFlags & FOCUSED) != 0)) { 5228 /* Give up focus if we are no longer focusable */ 5229 clearFocus(); 5230 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 5231 && ((privateFlags & FOCUSED) == 0)) { 5232 /* 5233 * Tell the view system that we are now available to take focus 5234 * if no one else already has it. 5235 */ 5236 if (mParent != null) mParent.focusableViewAvailable(this); 5237 } 5238 } 5239 5240 if ((flags & VISIBILITY_MASK) == VISIBLE) { 5241 if ((changed & VISIBILITY_MASK) != 0) { 5242 /* 5243 * If this view is becoming visible, set the DRAWN flag so that 5244 * the next invalidate() will not be skipped. 5245 */ 5246 mPrivateFlags |= DRAWN; 5247 5248 needGlobalAttributesUpdate(true); 5249 5250 // a view becoming visible is worth notifying the parent 5251 // about in case nothing has focus. even if this specific view 5252 // isn't focusable, it may contain something that is, so let 5253 // the root view try to give this focus if nothing else does. 5254 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 5255 mParent.focusableViewAvailable(this); 5256 } 5257 } 5258 } 5259 5260 /* Check if the GONE bit has changed */ 5261 if ((changed & GONE) != 0) { 5262 needGlobalAttributesUpdate(false); 5263 requestLayout(); 5264 invalidate(); 5265 5266 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 5267 if (hasFocus()) clearFocus(); 5268 destroyDrawingCache(); 5269 } 5270 if (mAttachInfo != null) { 5271 mAttachInfo.mViewVisibilityChanged = true; 5272 } 5273 } 5274 5275 /* Check if the VISIBLE bit has changed */ 5276 if ((changed & INVISIBLE) != 0) { 5277 needGlobalAttributesUpdate(false); 5278 invalidate(); 5279 5280 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 5281 // root view becoming invisible shouldn't clear focus 5282 if (getRootView() != this) { 5283 clearFocus(); 5284 } 5285 } 5286 if (mAttachInfo != null) { 5287 mAttachInfo.mViewVisibilityChanged = true; 5288 } 5289 } 5290 5291 if ((changed & VISIBILITY_MASK) != 0) { 5292 if (mParent instanceof ViewGroup) { 5293 ((ViewGroup)mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5294 } 5295 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5296 } 5297 5298 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 5299 destroyDrawingCache(); 5300 } 5301 5302 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 5303 destroyDrawingCache(); 5304 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5305 } 5306 5307 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 5308 destroyDrawingCache(); 5309 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5310 } 5311 5312 if ((changed & DRAW_MASK) != 0) { 5313 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 5314 if (mBGDrawable != null) { 5315 mPrivateFlags &= ~SKIP_DRAW; 5316 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 5317 } else { 5318 mPrivateFlags |= SKIP_DRAW; 5319 } 5320 } else { 5321 mPrivateFlags &= ~SKIP_DRAW; 5322 } 5323 requestLayout(); 5324 invalidate(); 5325 } 5326 5327 if ((changed & KEEP_SCREEN_ON) != 0) { 5328 if (mParent != null) { 5329 mParent.recomputeViewAttributes(this); 5330 } 5331 } 5332 } 5333 5334 /** 5335 * Change the view's z order in the tree, so it's on top of other sibling 5336 * views 5337 */ 5338 public void bringToFront() { 5339 if (mParent != null) { 5340 mParent.bringChildToFront(this); 5341 } 5342 } 5343 5344 /** 5345 * This is called in response to an internal scroll in this view (i.e., the 5346 * view scrolled its own contents). This is typically as a result of 5347 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 5348 * called. 5349 * 5350 * @param l Current horizontal scroll origin. 5351 * @param t Current vertical scroll origin. 5352 * @param oldl Previous horizontal scroll origin. 5353 * @param oldt Previous vertical scroll origin. 5354 */ 5355 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 5356 mBackgroundSizeChanged = true; 5357 5358 final AttachInfo ai = mAttachInfo; 5359 if (ai != null) { 5360 ai.mViewScrollChanged = true; 5361 } 5362 } 5363 5364 /** 5365 * Interface definition for a callback to be invoked when the layout bounds of a view 5366 * changes due to layout processing. 5367 */ 5368 public interface OnLayoutChangeListener { 5369 /** 5370 * Called when the focus state of a view has changed. 5371 * 5372 * @param v The view whose state has changed. 5373 * @param left The new value of the view's left property. 5374 * @param top The new value of the view's top property. 5375 * @param right The new value of the view's right property. 5376 * @param bottom The new value of the view's bottom property. 5377 * @param oldLeft The previous value of the view's left property. 5378 * @param oldTop The previous value of the view's top property. 5379 * @param oldRight The previous value of the view's right property. 5380 * @param oldBottom The previous value of the view's bottom property. 5381 */ 5382 void onLayoutChange(View v, int left, int top, int right, int bottom, 5383 int oldLeft, int oldTop, int oldRight, int oldBottom); 5384 } 5385 5386 /** 5387 * This is called during layout when the size of this view has changed. If 5388 * you were just added to the view hierarchy, you're called with the old 5389 * values of 0. 5390 * 5391 * @param w Current width of this view. 5392 * @param h Current height of this view. 5393 * @param oldw Old width of this view. 5394 * @param oldh Old height of this view. 5395 */ 5396 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5397 } 5398 5399 /** 5400 * Called by draw to draw the child views. This may be overridden 5401 * by derived classes to gain control just before its children are drawn 5402 * (but after its own view has been drawn). 5403 * @param canvas the canvas on which to draw the view 5404 */ 5405 protected void dispatchDraw(Canvas canvas) { 5406 } 5407 5408 /** 5409 * Gets the parent of this view. Note that the parent is a 5410 * ViewParent and not necessarily a View. 5411 * 5412 * @return Parent of this view. 5413 */ 5414 public final ViewParent getParent() { 5415 return mParent; 5416 } 5417 5418 /** 5419 * Return the scrolled left position of this view. This is the left edge of 5420 * the displayed part of your view. You do not need to draw any pixels 5421 * farther left, since those are outside of the frame of your view on 5422 * screen. 5423 * 5424 * @return The left edge of the displayed part of your view, in pixels. 5425 */ 5426 public final int getScrollX() { 5427 return mScrollX; 5428 } 5429 5430 /** 5431 * Return the scrolled top position of this view. This is the top edge of 5432 * the displayed part of your view. You do not need to draw any pixels above 5433 * it, since those are outside of the frame of your view on screen. 5434 * 5435 * @return The top edge of the displayed part of your view, in pixels. 5436 */ 5437 public final int getScrollY() { 5438 return mScrollY; 5439 } 5440 5441 /** 5442 * Return the width of the your view. 5443 * 5444 * @return The width of your view, in pixels. 5445 */ 5446 @ViewDebug.ExportedProperty(category = "layout") 5447 public final int getWidth() { 5448 return mRight - mLeft; 5449 } 5450 5451 /** 5452 * Return the height of your view. 5453 * 5454 * @return The height of your view, in pixels. 5455 */ 5456 @ViewDebug.ExportedProperty(category = "layout") 5457 public final int getHeight() { 5458 return mBottom - mTop; 5459 } 5460 5461 /** 5462 * Return the visible drawing bounds of your view. Fills in the output 5463 * rectangle with the values from getScrollX(), getScrollY(), 5464 * getWidth(), and getHeight(). 5465 * 5466 * @param outRect The (scrolled) drawing bounds of the view. 5467 */ 5468 public void getDrawingRect(Rect outRect) { 5469 outRect.left = mScrollX; 5470 outRect.top = mScrollY; 5471 outRect.right = mScrollX + (mRight - mLeft); 5472 outRect.bottom = mScrollY + (mBottom - mTop); 5473 } 5474 5475 /** 5476 * Like {@link #getMeasuredWidthAndState()}, but only returns the 5477 * raw width component (that is the result is masked by 5478 * {@link #MEASURED_SIZE_MASK}). 5479 * 5480 * @return The raw measured width of this view. 5481 */ 5482 public final int getMeasuredWidth() { 5483 return mMeasuredWidth & MEASURED_SIZE_MASK; 5484 } 5485 5486 /** 5487 * Return the full width measurement information for this view as computed 5488 * by the most recent call to {@link #measure}. This result is a bit mask 5489 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5490 * This should be used during measurement and layout calculations only. Use 5491 * {@link #getWidth()} to see how wide a view is after layout. 5492 * 5493 * @return The measured width of this view as a bit mask. 5494 */ 5495 public final int getMeasuredWidthAndState() { 5496 return mMeasuredWidth; 5497 } 5498 5499 /** 5500 * Like {@link #getMeasuredHeightAndState()}, but only returns the 5501 * raw width component (that is the result is masked by 5502 * {@link #MEASURED_SIZE_MASK}). 5503 * 5504 * @return The raw measured height of this view. 5505 */ 5506 public final int getMeasuredHeight() { 5507 return mMeasuredHeight & MEASURED_SIZE_MASK; 5508 } 5509 5510 /** 5511 * Return the full height measurement information for this view as computed 5512 * by the most recent call to {@link #measure}. This result is a bit mask 5513 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5514 * This should be used during measurement and layout calculations only. Use 5515 * {@link #getHeight()} to see how wide a view is after layout. 5516 * 5517 * @return The measured width of this view as a bit mask. 5518 */ 5519 public final int getMeasuredHeightAndState() { 5520 return mMeasuredHeight; 5521 } 5522 5523 /** 5524 * Return only the state bits of {@link #getMeasuredWidthAndState()} 5525 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 5526 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 5527 * and the height component is at the shifted bits 5528 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 5529 */ 5530 public final int getMeasuredState() { 5531 return (mMeasuredWidth&MEASURED_STATE_MASK) 5532 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 5533 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 5534 } 5535 5536 /** 5537 * The transform matrix of this view, which is calculated based on the current 5538 * roation, scale, and pivot properties. 5539 * 5540 * @see #getRotation() 5541 * @see #getScaleX() 5542 * @see #getScaleY() 5543 * @see #getPivotX() 5544 * @see #getPivotY() 5545 * @return The current transform matrix for the view 5546 */ 5547 public Matrix getMatrix() { 5548 updateMatrix(); 5549 return mMatrix; 5550 } 5551 5552 /** 5553 * Utility function to determine if the value is far enough away from zero to be 5554 * considered non-zero. 5555 * @param value A floating point value to check for zero-ness 5556 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5557 */ 5558 private static boolean nonzero(float value) { 5559 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5560 } 5561 5562 /** 5563 * Returns true if the transform matrix is the identity matrix. 5564 * Recomputes the matrix if necessary. 5565 * 5566 * @return True if the transform matrix is the identity matrix, false otherwise. 5567 */ 5568 final boolean hasIdentityMatrix() { 5569 updateMatrix(); 5570 return mMatrixIsIdentity; 5571 } 5572 5573 /** 5574 * Recomputes the transform matrix if necessary. 5575 */ 5576 private void updateMatrix() { 5577 if (mMatrixDirty) { 5578 // transform-related properties have changed since the last time someone 5579 // asked for the matrix; recalculate it with the current values 5580 5581 // Figure out if we need to update the pivot point 5582 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5583 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 5584 mPrevWidth = mRight - mLeft; 5585 mPrevHeight = mBottom - mTop; 5586 mPivotX = mPrevWidth / 2f; 5587 mPivotY = mPrevHeight / 2f; 5588 } 5589 } 5590 mMatrix.reset(); 5591 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5592 mMatrix.setTranslate(mTranslationX, mTranslationY); 5593 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5594 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5595 } else { 5596 if (mCamera == null) { 5597 mCamera = new Camera(); 5598 matrix3D = new Matrix(); 5599 } 5600 mCamera.save(); 5601 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5602 mCamera.rotateX(mRotationX); 5603 mCamera.rotateY(mRotationY); 5604 mCamera.rotateZ(-mRotation); 5605 mCamera.getMatrix(matrix3D); 5606 matrix3D.preTranslate(-mPivotX, -mPivotY); 5607 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5608 mMatrix.postConcat(matrix3D); 5609 mCamera.restore(); 5610 } 5611 mMatrixDirty = false; 5612 mMatrixIsIdentity = mMatrix.isIdentity(); 5613 mInverseMatrixDirty = true; 5614 } 5615 } 5616 5617 /** 5618 * Utility method to retrieve the inverse of the current mMatrix property. 5619 * We cache the matrix to avoid recalculating it when transform properties 5620 * have not changed. 5621 * 5622 * @return The inverse of the current matrix of this view. 5623 */ 5624 final Matrix getInverseMatrix() { 5625 updateMatrix(); 5626 if (mInverseMatrixDirty) { 5627 if (mInverseMatrix == null) { 5628 mInverseMatrix = new Matrix(); 5629 } 5630 mMatrix.invert(mInverseMatrix); 5631 mInverseMatrixDirty = false; 5632 } 5633 return mInverseMatrix; 5634 } 5635 5636 /** 5637 * The degrees that the view is rotated around the pivot point. 5638 * 5639 * @see #getPivotX() 5640 * @see #getPivotY() 5641 * @return The degrees of rotation. 5642 */ 5643 public float getRotation() { 5644 return mRotation; 5645 } 5646 5647 /** 5648 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5649 * result in clockwise rotation. 5650 * 5651 * @param rotation The degrees of rotation. 5652 * @see #getPivotX() 5653 * @see #getPivotY() 5654 * 5655 * @attr ref android.R.styleable#View_rotation 5656 */ 5657 public void setRotation(float rotation) { 5658 if (mRotation != rotation) { 5659 // Double-invalidation is necessary to capture view's old and new areas 5660 invalidate(false); 5661 mRotation = rotation; 5662 mMatrixDirty = true; 5663 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5664 invalidate(false); 5665 } 5666 } 5667 5668 /** 5669 * The degrees that the view is rotated around the vertical axis through the pivot point. 5670 * 5671 * @see #getPivotX() 5672 * @see #getPivotY() 5673 * @return The degrees of Y rotation. 5674 */ 5675 public float getRotationY() { 5676 return mRotationY; 5677 } 5678 5679 /** 5680 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5681 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5682 * down the y axis. 5683 * 5684 * @param rotationY The degrees of Y rotation. 5685 * @see #getPivotX() 5686 * @see #getPivotY() 5687 * 5688 * @attr ref android.R.styleable#View_rotationY 5689 */ 5690 public void setRotationY(float rotationY) { 5691 if (mRotationY != rotationY) { 5692 // Double-invalidation is necessary to capture view's old and new areas 5693 invalidate(false); 5694 mRotationY = rotationY; 5695 mMatrixDirty = true; 5696 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5697 invalidate(false); 5698 } 5699 } 5700 5701 /** 5702 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5703 * 5704 * @see #getPivotX() 5705 * @see #getPivotY() 5706 * @return The degrees of X rotation. 5707 */ 5708 public float getRotationX() { 5709 return mRotationX; 5710 } 5711 5712 /** 5713 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 5714 * Increasing values result in clockwise rotation from the viewpoint of looking down the 5715 * x axis. 5716 * 5717 * @param rotationX The degrees of X rotation. 5718 * @see #getPivotX() 5719 * @see #getPivotY() 5720 * 5721 * @attr ref android.R.styleable#View_rotationX 5722 */ 5723 public void setRotationX(float rotationX) { 5724 if (mRotationX != rotationX) { 5725 // Double-invalidation is necessary to capture view's old and new areas 5726 invalidate(false); 5727 mRotationX = rotationX; 5728 mMatrixDirty = true; 5729 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5730 invalidate(false); 5731 } 5732 } 5733 5734 /** 5735 * The amount that the view is scaled in x around the pivot point, as a proportion of 5736 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 5737 * 5738 * <p>By default, this is 1.0f. 5739 * 5740 * @see #getPivotX() 5741 * @see #getPivotY() 5742 * @return The scaling factor. 5743 */ 5744 public float getScaleX() { 5745 return mScaleX; 5746 } 5747 5748 /** 5749 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 5750 * the view's unscaled width. A value of 1 means that no scaling is applied. 5751 * 5752 * @param scaleX The scaling factor. 5753 * @see #getPivotX() 5754 * @see #getPivotY() 5755 * 5756 * @attr ref android.R.styleable#View_scaleX 5757 */ 5758 public void setScaleX(float scaleX) { 5759 if (mScaleX != scaleX) { 5760 // Double-invalidation is necessary to capture view's old and new areas 5761 invalidate(false); 5762 mScaleX = scaleX; 5763 mMatrixDirty = true; 5764 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5765 invalidate(false); 5766 } 5767 } 5768 5769 /** 5770 * The amount that the view is scaled in y around the pivot point, as a proportion of 5771 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 5772 * 5773 * <p>By default, this is 1.0f. 5774 * 5775 * @see #getPivotX() 5776 * @see #getPivotY() 5777 * @return The scaling factor. 5778 */ 5779 public float getScaleY() { 5780 return mScaleY; 5781 } 5782 5783 /** 5784 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 5785 * the view's unscaled width. A value of 1 means that no scaling is applied. 5786 * 5787 * @param scaleY The scaling factor. 5788 * @see #getPivotX() 5789 * @see #getPivotY() 5790 * 5791 * @attr ref android.R.styleable#View_scaleY 5792 */ 5793 public void setScaleY(float scaleY) { 5794 if (mScaleY != scaleY) { 5795 // Double-invalidation is necessary to capture view's old and new areas 5796 invalidate(false); 5797 mScaleY = scaleY; 5798 mMatrixDirty = true; 5799 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5800 invalidate(false); 5801 } 5802 } 5803 5804 /** 5805 * The x location of the point around which the view is {@link #setRotation(float) rotated} 5806 * and {@link #setScaleX(float) scaled}. 5807 * 5808 * @see #getRotation() 5809 * @see #getScaleX() 5810 * @see #getScaleY() 5811 * @see #getPivotY() 5812 * @return The x location of the pivot point. 5813 */ 5814 public float getPivotX() { 5815 return mPivotX; 5816 } 5817 5818 /** 5819 * Sets the x location of the point around which the view is 5820 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 5821 * By default, the pivot point is centered on the object. 5822 * Setting this property disables this behavior and causes the view to use only the 5823 * explicitly set pivotX and pivotY values. 5824 * 5825 * @param pivotX The x location of the pivot point. 5826 * @see #getRotation() 5827 * @see #getScaleX() 5828 * @see #getScaleY() 5829 * @see #getPivotY() 5830 * 5831 * @attr ref android.R.styleable#View_transformPivotX 5832 */ 5833 public void setPivotX(float pivotX) { 5834 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5835 if (mPivotX != pivotX) { 5836 // Double-invalidation is necessary to capture view's old and new areas 5837 invalidate(false); 5838 mPivotX = pivotX; 5839 mMatrixDirty = true; 5840 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5841 invalidate(false); 5842 } 5843 } 5844 5845 /** 5846 * The y location of the point around which the view is {@link #setRotation(float) rotated} 5847 * and {@link #setScaleY(float) scaled}. 5848 * 5849 * @see #getRotation() 5850 * @see #getScaleX() 5851 * @see #getScaleY() 5852 * @see #getPivotY() 5853 * @return The y location of the pivot point. 5854 */ 5855 public float getPivotY() { 5856 return mPivotY; 5857 } 5858 5859 /** 5860 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 5861 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 5862 * Setting this property disables this behavior and causes the view to use only the 5863 * explicitly set pivotX and pivotY values. 5864 * 5865 * @param pivotY The y location of the pivot point. 5866 * @see #getRotation() 5867 * @see #getScaleX() 5868 * @see #getScaleY() 5869 * @see #getPivotY() 5870 * 5871 * @attr ref android.R.styleable#View_transformPivotY 5872 */ 5873 public void setPivotY(float pivotY) { 5874 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5875 if (mPivotY != pivotY) { 5876 // Double-invalidation is necessary to capture view's old and new areas 5877 invalidate(false); 5878 mPivotY = pivotY; 5879 mMatrixDirty = true; 5880 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5881 invalidate(false); 5882 } 5883 } 5884 5885 /** 5886 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 5887 * completely transparent and 1 means the view is completely opaque. 5888 * 5889 * <p>By default this is 1.0f. 5890 * @return The opacity of the view. 5891 */ 5892 public float getAlpha() { 5893 return mAlpha; 5894 } 5895 5896 /** 5897 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 5898 * completely transparent and 1 means the view is completely opaque.</p> 5899 * 5900 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 5901 * responsible for applying the opacity itself. Otherwise, calling this method is 5902 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 5903 * setting a hardware layer.</p> 5904 * 5905 * @param alpha The opacity of the view. 5906 * 5907 * @see #setLayerType(int, android.graphics.Paint) 5908 * 5909 * @attr ref android.R.styleable#View_alpha 5910 */ 5911 public void setAlpha(float alpha) { 5912 mAlpha = alpha; 5913 if (onSetAlpha((int) (alpha * 255))) { 5914 mPrivateFlags |= ALPHA_SET; 5915 // subclass is handling alpha - don't optimize rendering cache invalidation 5916 invalidate(); 5917 } else { 5918 mPrivateFlags &= ~ALPHA_SET; 5919 invalidate(false); 5920 } 5921 } 5922 5923 /** 5924 * Top position of this view relative to its parent. 5925 * 5926 * @return The top of this view, in pixels. 5927 */ 5928 @ViewDebug.CapturedViewProperty 5929 public final int getTop() { 5930 return mTop; 5931 } 5932 5933 /** 5934 * Sets the top position of this view relative to its parent. This method is meant to be called 5935 * by the layout system and should not generally be called otherwise, because the property 5936 * may be changed at any time by the layout. 5937 * 5938 * @param top The top of this view, in pixels. 5939 */ 5940 public final void setTop(int top) { 5941 if (top != mTop) { 5942 updateMatrix(); 5943 if (mMatrixIsIdentity) { 5944 final ViewParent p = mParent; 5945 if (p != null && mAttachInfo != null) { 5946 final Rect r = mAttachInfo.mTmpInvalRect; 5947 int minTop; 5948 int yLoc; 5949 if (top < mTop) { 5950 minTop = top; 5951 yLoc = top - mTop; 5952 } else { 5953 minTop = mTop; 5954 yLoc = 0; 5955 } 5956 r.set(0, yLoc, mRight - mLeft, mBottom - minTop); 5957 p.invalidateChild(this, r); 5958 } 5959 } else { 5960 // Double-invalidation is necessary to capture view's old and new areas 5961 invalidate(); 5962 } 5963 5964 int width = mRight - mLeft; 5965 int oldHeight = mBottom - mTop; 5966 5967 mTop = top; 5968 5969 onSizeChanged(width, mBottom - mTop, width, oldHeight); 5970 5971 if (!mMatrixIsIdentity) { 5972 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5973 // A change in dimension means an auto-centered pivot point changes, too 5974 mMatrixDirty = true; 5975 } 5976 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5977 invalidate(); 5978 } 5979 mBackgroundSizeChanged = true; 5980 } 5981 } 5982 5983 /** 5984 * Bottom position of this view relative to its parent. 5985 * 5986 * @return The bottom of this view, in pixels. 5987 */ 5988 @ViewDebug.CapturedViewProperty 5989 public final int getBottom() { 5990 return mBottom; 5991 } 5992 5993 /** 5994 * True if this view has changed since the last time being drawn. 5995 * 5996 * @return The dirty state of this view. 5997 */ 5998 public boolean isDirty() { 5999 return (mPrivateFlags & DIRTY_MASK) != 0; 6000 } 6001 6002 /** 6003 * Sets the bottom position of this view relative to its parent. This method is meant to be 6004 * called by the layout system and should not generally be called otherwise, because the 6005 * property may be changed at any time by the layout. 6006 * 6007 * @param bottom The bottom of this view, in pixels. 6008 */ 6009 public final void setBottom(int bottom) { 6010 if (bottom != mBottom) { 6011 updateMatrix(); 6012 if (mMatrixIsIdentity) { 6013 final ViewParent p = mParent; 6014 if (p != null && mAttachInfo != null) { 6015 final Rect r = mAttachInfo.mTmpInvalRect; 6016 int maxBottom; 6017 if (bottom < mBottom) { 6018 maxBottom = mBottom; 6019 } else { 6020 maxBottom = bottom; 6021 } 6022 r.set(0, 0, mRight - mLeft, maxBottom - mTop); 6023 p.invalidateChild(this, r); 6024 } 6025 } else { 6026 // Double-invalidation is necessary to capture view's old and new areas 6027 invalidate(); 6028 } 6029 6030 int width = mRight - mLeft; 6031 int oldHeight = mBottom - mTop; 6032 6033 mBottom = bottom; 6034 6035 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6036 6037 if (!mMatrixIsIdentity) { 6038 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6039 // A change in dimension means an auto-centered pivot point changes, too 6040 mMatrixDirty = true; 6041 } 6042 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6043 invalidate(); 6044 } 6045 mBackgroundSizeChanged = true; 6046 } 6047 } 6048 6049 /** 6050 * Left position of this view relative to its parent. 6051 * 6052 * @return The left edge of this view, in pixels. 6053 */ 6054 @ViewDebug.CapturedViewProperty 6055 public final int getLeft() { 6056 return mLeft; 6057 } 6058 6059 /** 6060 * Sets the left position of this view relative to its parent. This method is meant to be called 6061 * by the layout system and should not generally be called otherwise, because the property 6062 * may be changed at any time by the layout. 6063 * 6064 * @param left The bottom of this view, in pixels. 6065 */ 6066 public final void setLeft(int left) { 6067 if (left != mLeft) { 6068 updateMatrix(); 6069 if (mMatrixIsIdentity) { 6070 final ViewParent p = mParent; 6071 if (p != null && mAttachInfo != null) { 6072 final Rect r = mAttachInfo.mTmpInvalRect; 6073 int minLeft; 6074 int xLoc; 6075 if (left < mLeft) { 6076 minLeft = left; 6077 xLoc = left - mLeft; 6078 } else { 6079 minLeft = mLeft; 6080 xLoc = 0; 6081 } 6082 r.set(xLoc, 0, mRight - minLeft, mBottom - mTop); 6083 p.invalidateChild(this, r); 6084 } 6085 } else { 6086 // Double-invalidation is necessary to capture view's old and new areas 6087 invalidate(); 6088 } 6089 6090 int oldWidth = mRight - mLeft; 6091 int height = mBottom - mTop; 6092 6093 mLeft = left; 6094 6095 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6096 6097 if (!mMatrixIsIdentity) { 6098 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6099 // A change in dimension means an auto-centered pivot point changes, too 6100 mMatrixDirty = true; 6101 } 6102 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6103 invalidate(); 6104 } 6105 mBackgroundSizeChanged = true; 6106 } 6107 } 6108 6109 /** 6110 * Right position of this view relative to its parent. 6111 * 6112 * @return The right edge of this view, in pixels. 6113 */ 6114 @ViewDebug.CapturedViewProperty 6115 public final int getRight() { 6116 return mRight; 6117 } 6118 6119 /** 6120 * Sets the right position of this view relative to its parent. This method is meant to be called 6121 * by the layout system and should not generally be called otherwise, because the property 6122 * may be changed at any time by the layout. 6123 * 6124 * @param right The bottom of this view, in pixels. 6125 */ 6126 public final void setRight(int right) { 6127 if (right != mRight) { 6128 updateMatrix(); 6129 if (mMatrixIsIdentity) { 6130 final ViewParent p = mParent; 6131 if (p != null && mAttachInfo != null) { 6132 final Rect r = mAttachInfo.mTmpInvalRect; 6133 int maxRight; 6134 if (right < mRight) { 6135 maxRight = mRight; 6136 } else { 6137 maxRight = right; 6138 } 6139 r.set(0, 0, maxRight - mLeft, mBottom - mTop); 6140 p.invalidateChild(this, r); 6141 } 6142 } else { 6143 // Double-invalidation is necessary to capture view's old and new areas 6144 invalidate(); 6145 } 6146 6147 int oldWidth = mRight - mLeft; 6148 int height = mBottom - mTop; 6149 6150 mRight = right; 6151 6152 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6153 6154 if (!mMatrixIsIdentity) { 6155 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6156 // A change in dimension means an auto-centered pivot point changes, too 6157 mMatrixDirty = true; 6158 } 6159 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6160 invalidate(); 6161 } 6162 mBackgroundSizeChanged = true; 6163 } 6164 } 6165 6166 /** 6167 * The visual x position of this view, in pixels. This is equivalent to the 6168 * {@link #setTranslationX(float) translationX} property plus the current 6169 * {@link #getLeft() left} property. 6170 * 6171 * @return The visual x position of this view, in pixels. 6172 */ 6173 public float getX() { 6174 return mLeft + mTranslationX; 6175 } 6176 6177 /** 6178 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 6179 * {@link #setTranslationX(float) translationX} property to be the difference between 6180 * the x value passed in and the current {@link #getLeft() left} property. 6181 * 6182 * @param x The visual x position of this view, in pixels. 6183 */ 6184 public void setX(float x) { 6185 setTranslationX(x - mLeft); 6186 } 6187 6188 /** 6189 * The visual y position of this view, in pixels. This is equivalent to the 6190 * {@link #setTranslationY(float) translationY} property plus the current 6191 * {@link #getTop() top} property. 6192 * 6193 * @return The visual y position of this view, in pixels. 6194 */ 6195 public float getY() { 6196 return mTop + mTranslationY; 6197 } 6198 6199 /** 6200 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 6201 * {@link #setTranslationY(float) translationY} property to be the difference between 6202 * the y value passed in and the current {@link #getTop() top} property. 6203 * 6204 * @param y The visual y position of this view, in pixels. 6205 */ 6206 public void setY(float y) { 6207 setTranslationY(y - mTop); 6208 } 6209 6210 6211 /** 6212 * The horizontal location of this view relative to its {@link #getLeft() left} position. 6213 * This position is post-layout, in addition to wherever the object's 6214 * layout placed it. 6215 * 6216 * @return The horizontal position of this view relative to its left position, in pixels. 6217 */ 6218 public float getTranslationX() { 6219 return mTranslationX; 6220 } 6221 6222 /** 6223 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 6224 * This effectively positions the object post-layout, in addition to wherever the object's 6225 * layout placed it. 6226 * 6227 * @param translationX The horizontal position of this view relative to its left position, 6228 * in pixels. 6229 * 6230 * @attr ref android.R.styleable#View_translationX 6231 */ 6232 public void setTranslationX(float translationX) { 6233 if (mTranslationX != translationX) { 6234 // Double-invalidation is necessary to capture view's old and new areas 6235 invalidate(false); 6236 mTranslationX = translationX; 6237 mMatrixDirty = true; 6238 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6239 invalidate(false); 6240 } 6241 } 6242 6243 /** 6244 * The horizontal location of this view relative to its {@link #getTop() top} position. 6245 * This position is post-layout, in addition to wherever the object's 6246 * layout placed it. 6247 * 6248 * @return The vertical position of this view relative to its top position, 6249 * in pixels. 6250 */ 6251 public float getTranslationY() { 6252 return mTranslationY; 6253 } 6254 6255 /** 6256 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 6257 * This effectively positions the object post-layout, in addition to wherever the object's 6258 * layout placed it. 6259 * 6260 * @param translationY The vertical position of this view relative to its top position, 6261 * in pixels. 6262 * 6263 * @attr ref android.R.styleable#View_translationY 6264 */ 6265 public void setTranslationY(float translationY) { 6266 if (mTranslationY != translationY) { 6267 // Double-invalidation is necessary to capture view's old and new areas 6268 invalidate(false); 6269 mTranslationY = translationY; 6270 mMatrixDirty = true; 6271 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6272 invalidate(false); 6273 } 6274 } 6275 6276 /** 6277 * Hit rectangle in parent's coordinates 6278 * 6279 * @param outRect The hit rectangle of the view. 6280 */ 6281 public void getHitRect(Rect outRect) { 6282 updateMatrix(); 6283 if (mMatrixIsIdentity || mAttachInfo == null) { 6284 outRect.set(mLeft, mTop, mRight, mBottom); 6285 } else { 6286 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 6287 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 6288 mMatrix.mapRect(tmpRect); 6289 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 6290 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 6291 } 6292 } 6293 6294 /** 6295 * Determines whether the given point, in local coordinates is inside the view. 6296 */ 6297 /*package*/ final boolean pointInView(float localX, float localY) { 6298 return localX >= 0 && localX < (mRight - mLeft) 6299 && localY >= 0 && localY < (mBottom - mTop); 6300 } 6301 6302 /** 6303 * Utility method to determine whether the given point, in local coordinates, 6304 * is inside the view, where the area of the view is expanded by the slop factor. 6305 * This method is called while processing touch-move events to determine if the event 6306 * is still within the view. 6307 */ 6308 private boolean pointInView(float localX, float localY, float slop) { 6309 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 6310 localY < ((mBottom - mTop) + slop); 6311 } 6312 6313 /** 6314 * When a view has focus and the user navigates away from it, the next view is searched for 6315 * starting from the rectangle filled in by this method. 6316 * 6317 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 6318 * view maintains some idea of internal selection, such as a cursor, or a selected row 6319 * or column, you should override this method and fill in a more specific rectangle. 6320 * 6321 * @param r The rectangle to fill in, in this view's coordinates. 6322 */ 6323 public void getFocusedRect(Rect r) { 6324 getDrawingRect(r); 6325 } 6326 6327 /** 6328 * If some part of this view is not clipped by any of its parents, then 6329 * return that area in r in global (root) coordinates. To convert r to local 6330 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 6331 * -globalOffset.y)) If the view is completely clipped or translated out, 6332 * return false. 6333 * 6334 * @param r If true is returned, r holds the global coordinates of the 6335 * visible portion of this view. 6336 * @param globalOffset If true is returned, globalOffset holds the dx,dy 6337 * between this view and its root. globalOffet may be null. 6338 * @return true if r is non-empty (i.e. part of the view is visible at the 6339 * root level. 6340 */ 6341 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 6342 int width = mRight - mLeft; 6343 int height = mBottom - mTop; 6344 if (width > 0 && height > 0) { 6345 r.set(0, 0, width, height); 6346 if (globalOffset != null) { 6347 globalOffset.set(-mScrollX, -mScrollY); 6348 } 6349 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 6350 } 6351 return false; 6352 } 6353 6354 public final boolean getGlobalVisibleRect(Rect r) { 6355 return getGlobalVisibleRect(r, null); 6356 } 6357 6358 public final boolean getLocalVisibleRect(Rect r) { 6359 Point offset = new Point(); 6360 if (getGlobalVisibleRect(r, offset)) { 6361 r.offset(-offset.x, -offset.y); // make r local 6362 return true; 6363 } 6364 return false; 6365 } 6366 6367 /** 6368 * Offset this view's vertical location by the specified number of pixels. 6369 * 6370 * @param offset the number of pixels to offset the view by 6371 */ 6372 public void offsetTopAndBottom(int offset) { 6373 if (offset != 0) { 6374 updateMatrix(); 6375 if (mMatrixIsIdentity) { 6376 final ViewParent p = mParent; 6377 if (p != null && mAttachInfo != null) { 6378 final Rect r = mAttachInfo.mTmpInvalRect; 6379 int minTop; 6380 int maxBottom; 6381 int yLoc; 6382 if (offset < 0) { 6383 minTop = mTop + offset; 6384 maxBottom = mBottom; 6385 yLoc = offset; 6386 } else { 6387 minTop = mTop; 6388 maxBottom = mBottom + offset; 6389 yLoc = 0; 6390 } 6391 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 6392 p.invalidateChild(this, r); 6393 } 6394 } else { 6395 invalidate(false); 6396 } 6397 6398 mTop += offset; 6399 mBottom += offset; 6400 6401 if (!mMatrixIsIdentity) { 6402 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6403 invalidate(false); 6404 } 6405 } 6406 } 6407 6408 /** 6409 * Offset this view's horizontal location by the specified amount of pixels. 6410 * 6411 * @param offset the numer of pixels to offset the view by 6412 */ 6413 public void offsetLeftAndRight(int offset) { 6414 if (offset != 0) { 6415 updateMatrix(); 6416 if (mMatrixIsIdentity) { 6417 final ViewParent p = mParent; 6418 if (p != null && mAttachInfo != null) { 6419 final Rect r = mAttachInfo.mTmpInvalRect; 6420 int minLeft; 6421 int maxRight; 6422 if (offset < 0) { 6423 minLeft = mLeft + offset; 6424 maxRight = mRight; 6425 } else { 6426 minLeft = mLeft; 6427 maxRight = mRight + offset; 6428 } 6429 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 6430 p.invalidateChild(this, r); 6431 } 6432 } else { 6433 invalidate(false); 6434 } 6435 6436 mLeft += offset; 6437 mRight += offset; 6438 6439 if (!mMatrixIsIdentity) { 6440 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6441 invalidate(false); 6442 } 6443 } 6444 } 6445 6446 /** 6447 * Get the LayoutParams associated with this view. All views should have 6448 * layout parameters. These supply parameters to the <i>parent</i> of this 6449 * view specifying how it should be arranged. There are many subclasses of 6450 * ViewGroup.LayoutParams, and these correspond to the different subclasses 6451 * of ViewGroup that are responsible for arranging their children. 6452 * @return The LayoutParams associated with this view 6453 */ 6454 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 6455 public ViewGroup.LayoutParams getLayoutParams() { 6456 return mLayoutParams; 6457 } 6458 6459 /** 6460 * Set the layout parameters associated with this view. These supply 6461 * parameters to the <i>parent</i> of this view specifying how it should be 6462 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 6463 * correspond to the different subclasses of ViewGroup that are responsible 6464 * for arranging their children. 6465 * 6466 * @param params the layout parameters for this view 6467 */ 6468 public void setLayoutParams(ViewGroup.LayoutParams params) { 6469 if (params == null) { 6470 throw new NullPointerException("params == null"); 6471 } 6472 mLayoutParams = params; 6473 requestLayout(); 6474 } 6475 6476 /** 6477 * Set the scrolled position of your view. This will cause a call to 6478 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6479 * invalidated. 6480 * @param x the x position to scroll to 6481 * @param y the y position to scroll to 6482 */ 6483 public void scrollTo(int x, int y) { 6484 if (mScrollX != x || mScrollY != y) { 6485 int oldX = mScrollX; 6486 int oldY = mScrollY; 6487 mScrollX = x; 6488 mScrollY = y; 6489 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 6490 if (!awakenScrollBars()) { 6491 invalidate(); 6492 } 6493 } 6494 } 6495 6496 /** 6497 * Move the scrolled position of your view. This will cause a call to 6498 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6499 * invalidated. 6500 * @param x the amount of pixels to scroll by horizontally 6501 * @param y the amount of pixels to scroll by vertically 6502 */ 6503 public void scrollBy(int x, int y) { 6504 scrollTo(mScrollX + x, mScrollY + y); 6505 } 6506 6507 /** 6508 * <p>Trigger the scrollbars to draw. When invoked this method starts an 6509 * animation to fade the scrollbars out after a default delay. If a subclass 6510 * provides animated scrolling, the start delay should equal the duration 6511 * of the scrolling animation.</p> 6512 * 6513 * <p>The animation starts only if at least one of the scrollbars is 6514 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 6515 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6516 * this method returns true, and false otherwise. If the animation is 6517 * started, this method calls {@link #invalidate()}; in that case the 6518 * caller should not call {@link #invalidate()}.</p> 6519 * 6520 * <p>This method should be invoked every time a subclass directly updates 6521 * the scroll parameters.</p> 6522 * 6523 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6524 * and {@link #scrollTo(int, int)}.</p> 6525 * 6526 * @return true if the animation is played, false otherwise 6527 * 6528 * @see #awakenScrollBars(int) 6529 * @see #scrollBy(int, int) 6530 * @see #scrollTo(int, int) 6531 * @see #isHorizontalScrollBarEnabled() 6532 * @see #isVerticalScrollBarEnabled() 6533 * @see #setHorizontalScrollBarEnabled(boolean) 6534 * @see #setVerticalScrollBarEnabled(boolean) 6535 */ 6536 protected boolean awakenScrollBars() { 6537 return mScrollCache != null && 6538 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6539 } 6540 6541 /** 6542 * Trigger the scrollbars to draw. 6543 * This method differs from awakenScrollBars() only in its default duration. 6544 * initialAwakenScrollBars() will show the scroll bars for longer than 6545 * usual to give the user more of a chance to notice them. 6546 * 6547 * @return true if the animation is played, false otherwise. 6548 */ 6549 private boolean initialAwakenScrollBars() { 6550 return mScrollCache != null && 6551 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6552 } 6553 6554 /** 6555 * <p> 6556 * Trigger the scrollbars to draw. When invoked this method starts an 6557 * animation to fade the scrollbars out after a fixed delay. If a subclass 6558 * provides animated scrolling, the start delay should equal the duration of 6559 * the scrolling animation. 6560 * </p> 6561 * 6562 * <p> 6563 * The animation starts only if at least one of the scrollbars is enabled, 6564 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6565 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6566 * this method returns true, and false otherwise. If the animation is 6567 * started, this method calls {@link #invalidate()}; in that case the caller 6568 * should not call {@link #invalidate()}. 6569 * </p> 6570 * 6571 * <p> 6572 * This method should be invoked everytime a subclass directly updates the 6573 * scroll parameters. 6574 * </p> 6575 * 6576 * @param startDelay the delay, in milliseconds, after which the animation 6577 * should start; when the delay is 0, the animation starts 6578 * immediately 6579 * @return true if the animation is played, false otherwise 6580 * 6581 * @see #scrollBy(int, int) 6582 * @see #scrollTo(int, int) 6583 * @see #isHorizontalScrollBarEnabled() 6584 * @see #isVerticalScrollBarEnabled() 6585 * @see #setHorizontalScrollBarEnabled(boolean) 6586 * @see #setVerticalScrollBarEnabled(boolean) 6587 */ 6588 protected boolean awakenScrollBars(int startDelay) { 6589 return awakenScrollBars(startDelay, true); 6590 } 6591 6592 /** 6593 * <p> 6594 * Trigger the scrollbars to draw. When invoked this method starts an 6595 * animation to fade the scrollbars out after a fixed delay. If a subclass 6596 * provides animated scrolling, the start delay should equal the duration of 6597 * the scrolling animation. 6598 * </p> 6599 * 6600 * <p> 6601 * The animation starts only if at least one of the scrollbars is enabled, 6602 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6603 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6604 * this method returns true, and false otherwise. If the animation is 6605 * started, this method calls {@link #invalidate()} if the invalidate parameter 6606 * is set to true; in that case the caller 6607 * should not call {@link #invalidate()}. 6608 * </p> 6609 * 6610 * <p> 6611 * This method should be invoked everytime a subclass directly updates the 6612 * scroll parameters. 6613 * </p> 6614 * 6615 * @param startDelay the delay, in milliseconds, after which the animation 6616 * should start; when the delay is 0, the animation starts 6617 * immediately 6618 * 6619 * @param invalidate Wheter this method should call invalidate 6620 * 6621 * @return true if the animation is played, false otherwise 6622 * 6623 * @see #scrollBy(int, int) 6624 * @see #scrollTo(int, int) 6625 * @see #isHorizontalScrollBarEnabled() 6626 * @see #isVerticalScrollBarEnabled() 6627 * @see #setHorizontalScrollBarEnabled(boolean) 6628 * @see #setVerticalScrollBarEnabled(boolean) 6629 */ 6630 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 6631 final ScrollabilityCache scrollCache = mScrollCache; 6632 6633 if (scrollCache == null || !scrollCache.fadeScrollBars) { 6634 return false; 6635 } 6636 6637 if (scrollCache.scrollBar == null) { 6638 scrollCache.scrollBar = new ScrollBarDrawable(); 6639 } 6640 6641 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 6642 6643 if (invalidate) { 6644 // Invalidate to show the scrollbars 6645 invalidate(); 6646 } 6647 6648 if (scrollCache.state == ScrollabilityCache.OFF) { 6649 // FIXME: this is copied from WindowManagerService. 6650 // We should get this value from the system when it 6651 // is possible to do so. 6652 final int KEY_REPEAT_FIRST_DELAY = 750; 6653 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 6654 } 6655 6656 // Tell mScrollCache when we should start fading. This may 6657 // extend the fade start time if one was already scheduled 6658 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 6659 scrollCache.fadeStartTime = fadeStartTime; 6660 scrollCache.state = ScrollabilityCache.ON; 6661 6662 // Schedule our fader to run, unscheduling any old ones first 6663 if (mAttachInfo != null) { 6664 mAttachInfo.mHandler.removeCallbacks(scrollCache); 6665 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 6666 } 6667 6668 return true; 6669 } 6670 6671 return false; 6672 } 6673 6674 /** 6675 * Mark the the area defined by dirty as needing to be drawn. If the view is 6676 * visible, {@link #onDraw} will be called at some point in the future. 6677 * This must be called from a UI thread. To call from a non-UI thread, call 6678 * {@link #postInvalidate()}. 6679 * 6680 * WARNING: This method is destructive to dirty. 6681 * @param dirty the rectangle representing the bounds of the dirty region 6682 */ 6683 public void invalidate(Rect dirty) { 6684 if (ViewDebug.TRACE_HIERARCHY) { 6685 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6686 } 6687 6688 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6689 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6690 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6691 final ViewParent p = mParent; 6692 final AttachInfo ai = mAttachInfo; 6693 if (p != null && ai != null && ai.mHardwareAccelerated) { 6694 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6695 // with a null dirty rect, which tells the ViewRoot to redraw everything 6696 p.invalidateChild(this, null); 6697 return; 6698 } 6699 if (p != null && ai != null) { 6700 final int scrollX = mScrollX; 6701 final int scrollY = mScrollY; 6702 final Rect r = ai.mTmpInvalRect; 6703 r.set(dirty.left - scrollX, dirty.top - scrollY, 6704 dirty.right - scrollX, dirty.bottom - scrollY); 6705 mParent.invalidateChild(this, r); 6706 } 6707 } 6708 } 6709 6710 /** 6711 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 6712 * The coordinates of the dirty rect are relative to the view. 6713 * If the view is visible, {@link #onDraw} will be called at some point 6714 * in the future. This must be called from a UI thread. To call 6715 * from a non-UI thread, call {@link #postInvalidate()}. 6716 * @param l the left position of the dirty region 6717 * @param t the top position of the dirty region 6718 * @param r the right position of the dirty region 6719 * @param b the bottom position of the dirty region 6720 */ 6721 public void invalidate(int l, int t, int r, int b) { 6722 if (ViewDebug.TRACE_HIERARCHY) { 6723 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6724 } 6725 6726 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6727 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6728 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6729 final ViewParent p = mParent; 6730 final AttachInfo ai = mAttachInfo; 6731 if (p != null && ai != null && ai.mHardwareAccelerated) { 6732 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6733 // with a null dirty rect, which tells the ViewRoot to redraw everything 6734 p.invalidateChild(this, null); 6735 return; 6736 } 6737 if (p != null && ai != null && l < r && t < b) { 6738 final int scrollX = mScrollX; 6739 final int scrollY = mScrollY; 6740 final Rect tmpr = ai.mTmpInvalRect; 6741 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 6742 p.invalidateChild(this, tmpr); 6743 } 6744 } 6745 } 6746 6747 /** 6748 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 6749 * be called at some point in the future. This must be called from a 6750 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 6751 */ 6752 public void invalidate() { 6753 invalidate(true); 6754 } 6755 6756 /** 6757 * This is where the invalidate() work actually happens. A full invalidate() 6758 * causes the drawing cache to be invalidated, but this function can be called with 6759 * invalidateCache set to false to skip that invalidation step for cases that do not 6760 * need it (for example, a component that remains at the same dimensions with the same 6761 * content). 6762 * 6763 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 6764 * well. This is usually true for a full invalidate, but may be set to false if the 6765 * View's contents or dimensions have not changed. 6766 */ 6767 private void invalidate(boolean invalidateCache) { 6768 if (ViewDebug.TRACE_HIERARCHY) { 6769 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6770 } 6771 6772 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6773 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID)) { 6774 mPrivateFlags &= ~DRAWN; 6775 if (invalidateCache) { 6776 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6777 } 6778 final AttachInfo ai = mAttachInfo; 6779 final ViewParent p = mParent; 6780 if (p != null && ai != null && ai.mHardwareAccelerated) { 6781 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6782 // with a null dirty rect, which tells the ViewRoot to redraw everything 6783 p.invalidateChild(this, null); 6784 return; 6785 } 6786 6787 if (p != null && ai != null) { 6788 final Rect r = ai.mTmpInvalRect; 6789 r.set(0, 0, mRight - mLeft, mBottom - mTop); 6790 // Don't call invalidate -- we don't want to internally scroll 6791 // our own bounds 6792 p.invalidateChild(this, r); 6793 } 6794 } 6795 } 6796 6797 /** 6798 * Indicates whether this View is opaque. An opaque View guarantees that it will 6799 * draw all the pixels overlapping its bounds using a fully opaque color. 6800 * 6801 * Subclasses of View should override this method whenever possible to indicate 6802 * whether an instance is opaque. Opaque Views are treated in a special way by 6803 * the View hierarchy, possibly allowing it to perform optimizations during 6804 * invalidate/draw passes. 6805 * 6806 * @return True if this View is guaranteed to be fully opaque, false otherwise. 6807 */ 6808 @ViewDebug.ExportedProperty(category = "drawing") 6809 public boolean isOpaque() { 6810 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 6811 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 6812 } 6813 6814 /** 6815 * @hide 6816 */ 6817 protected void computeOpaqueFlags() { 6818 // Opaque if: 6819 // - Has a background 6820 // - Background is opaque 6821 // - Doesn't have scrollbars or scrollbars are inside overlay 6822 6823 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 6824 mPrivateFlags |= OPAQUE_BACKGROUND; 6825 } else { 6826 mPrivateFlags &= ~OPAQUE_BACKGROUND; 6827 } 6828 6829 final int flags = mViewFlags; 6830 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 6831 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 6832 mPrivateFlags |= OPAQUE_SCROLLBARS; 6833 } else { 6834 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 6835 } 6836 } 6837 6838 /** 6839 * @hide 6840 */ 6841 protected boolean hasOpaqueScrollbars() { 6842 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 6843 } 6844 6845 /** 6846 * @return A handler associated with the thread running the View. This 6847 * handler can be used to pump events in the UI events queue. 6848 */ 6849 public Handler getHandler() { 6850 if (mAttachInfo != null) { 6851 return mAttachInfo.mHandler; 6852 } 6853 return null; 6854 } 6855 6856 /** 6857 * Causes the Runnable to be added to the message queue. 6858 * The runnable will be run on the user interface thread. 6859 * 6860 * @param action The Runnable that will be executed. 6861 * 6862 * @return Returns true if the Runnable was successfully placed in to the 6863 * message queue. Returns false on failure, usually because the 6864 * looper processing the message queue is exiting. 6865 */ 6866 public boolean post(Runnable action) { 6867 Handler handler; 6868 if (mAttachInfo != null) { 6869 handler = mAttachInfo.mHandler; 6870 } else { 6871 // Assume that post will succeed later 6872 ViewRoot.getRunQueue().post(action); 6873 return true; 6874 } 6875 6876 return handler.post(action); 6877 } 6878 6879 /** 6880 * Causes the Runnable to be added to the message queue, to be run 6881 * after the specified amount of time elapses. 6882 * The runnable will be run on the user interface thread. 6883 * 6884 * @param action The Runnable that will be executed. 6885 * @param delayMillis The delay (in milliseconds) until the Runnable 6886 * will be executed. 6887 * 6888 * @return true if the Runnable was successfully placed in to the 6889 * message queue. Returns false on failure, usually because the 6890 * looper processing the message queue is exiting. Note that a 6891 * result of true does not mean the Runnable will be processed -- 6892 * if the looper is quit before the delivery time of the message 6893 * occurs then the message will be dropped. 6894 */ 6895 public boolean postDelayed(Runnable action, long delayMillis) { 6896 Handler handler; 6897 if (mAttachInfo != null) { 6898 handler = mAttachInfo.mHandler; 6899 } else { 6900 // Assume that post will succeed later 6901 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 6902 return true; 6903 } 6904 6905 return handler.postDelayed(action, delayMillis); 6906 } 6907 6908 /** 6909 * Removes the specified Runnable from the message queue. 6910 * 6911 * @param action The Runnable to remove from the message handling queue 6912 * 6913 * @return true if this view could ask the Handler to remove the Runnable, 6914 * false otherwise. When the returned value is true, the Runnable 6915 * may or may not have been actually removed from the message queue 6916 * (for instance, if the Runnable was not in the queue already.) 6917 */ 6918 public boolean removeCallbacks(Runnable action) { 6919 Handler handler; 6920 if (mAttachInfo != null) { 6921 handler = mAttachInfo.mHandler; 6922 } else { 6923 // Assume that post will succeed later 6924 ViewRoot.getRunQueue().removeCallbacks(action); 6925 return true; 6926 } 6927 6928 handler.removeCallbacks(action); 6929 return true; 6930 } 6931 6932 /** 6933 * Cause an invalidate to happen on a subsequent cycle through the event loop. 6934 * Use this to invalidate the View from a non-UI thread. 6935 * 6936 * @see #invalidate() 6937 */ 6938 public void postInvalidate() { 6939 postInvalidateDelayed(0); 6940 } 6941 6942 /** 6943 * Cause an invalidate of the specified area to happen on a subsequent cycle 6944 * through the event loop. Use this to invalidate the View from a non-UI thread. 6945 * 6946 * @param left The left coordinate of the rectangle to invalidate. 6947 * @param top The top coordinate of the rectangle to invalidate. 6948 * @param right The right coordinate of the rectangle to invalidate. 6949 * @param bottom The bottom coordinate of the rectangle to invalidate. 6950 * 6951 * @see #invalidate(int, int, int, int) 6952 * @see #invalidate(Rect) 6953 */ 6954 public void postInvalidate(int left, int top, int right, int bottom) { 6955 postInvalidateDelayed(0, left, top, right, bottom); 6956 } 6957 6958 /** 6959 * Cause an invalidate to happen on a subsequent cycle through the event 6960 * loop. Waits for the specified amount of time. 6961 * 6962 * @param delayMilliseconds the duration in milliseconds to delay the 6963 * invalidation by 6964 */ 6965 public void postInvalidateDelayed(long delayMilliseconds) { 6966 // We try only with the AttachInfo because there's no point in invalidating 6967 // if we are not attached to our window 6968 if (mAttachInfo != null) { 6969 Message msg = Message.obtain(); 6970 msg.what = AttachInfo.INVALIDATE_MSG; 6971 msg.obj = this; 6972 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6973 } 6974 } 6975 6976 /** 6977 * Cause an invalidate of the specified area to happen on a subsequent cycle 6978 * through the event loop. Waits for the specified amount of time. 6979 * 6980 * @param delayMilliseconds the duration in milliseconds to delay the 6981 * invalidation by 6982 * @param left The left coordinate of the rectangle to invalidate. 6983 * @param top The top coordinate of the rectangle to invalidate. 6984 * @param right The right coordinate of the rectangle to invalidate. 6985 * @param bottom The bottom coordinate of the rectangle to invalidate. 6986 */ 6987 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 6988 int right, int bottom) { 6989 6990 // We try only with the AttachInfo because there's no point in invalidating 6991 // if we are not attached to our window 6992 if (mAttachInfo != null) { 6993 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 6994 info.target = this; 6995 info.left = left; 6996 info.top = top; 6997 info.right = right; 6998 info.bottom = bottom; 6999 7000 final Message msg = Message.obtain(); 7001 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 7002 msg.obj = info; 7003 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 7004 } 7005 } 7006 7007 /** 7008 * Called by a parent to request that a child update its values for mScrollX 7009 * and mScrollY if necessary. This will typically be done if the child is 7010 * animating a scroll using a {@link android.widget.Scroller Scroller} 7011 * object. 7012 */ 7013 public void computeScroll() { 7014 } 7015 7016 /** 7017 * <p>Indicate whether the horizontal edges are faded when the view is 7018 * scrolled horizontally.</p> 7019 * 7020 * @return true if the horizontal edges should are faded on scroll, false 7021 * otherwise 7022 * 7023 * @see #setHorizontalFadingEdgeEnabled(boolean) 7024 * @attr ref android.R.styleable#View_fadingEdge 7025 */ 7026 public boolean isHorizontalFadingEdgeEnabled() { 7027 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 7028 } 7029 7030 /** 7031 * <p>Define whether the horizontal edges should be faded when this view 7032 * is scrolled horizontally.</p> 7033 * 7034 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 7035 * be faded when the view is scrolled 7036 * horizontally 7037 * 7038 * @see #isHorizontalFadingEdgeEnabled() 7039 * @attr ref android.R.styleable#View_fadingEdge 7040 */ 7041 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 7042 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 7043 if (horizontalFadingEdgeEnabled) { 7044 initScrollCache(); 7045 } 7046 7047 mViewFlags ^= FADING_EDGE_HORIZONTAL; 7048 } 7049 } 7050 7051 /** 7052 * <p>Indicate whether the vertical edges are faded when the view is 7053 * scrolled horizontally.</p> 7054 * 7055 * @return true if the vertical edges should are faded on scroll, false 7056 * otherwise 7057 * 7058 * @see #setVerticalFadingEdgeEnabled(boolean) 7059 * @attr ref android.R.styleable#View_fadingEdge 7060 */ 7061 public boolean isVerticalFadingEdgeEnabled() { 7062 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 7063 } 7064 7065 /** 7066 * <p>Define whether the vertical edges should be faded when this view 7067 * is scrolled vertically.</p> 7068 * 7069 * @param verticalFadingEdgeEnabled true if the vertical edges should 7070 * be faded when the view is scrolled 7071 * vertically 7072 * 7073 * @see #isVerticalFadingEdgeEnabled() 7074 * @attr ref android.R.styleable#View_fadingEdge 7075 */ 7076 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 7077 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 7078 if (verticalFadingEdgeEnabled) { 7079 initScrollCache(); 7080 } 7081 7082 mViewFlags ^= FADING_EDGE_VERTICAL; 7083 } 7084 } 7085 7086 /** 7087 * Returns the strength, or intensity, of the top faded edge. The strength is 7088 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7089 * returns 0.0 or 1.0 but no value in between. 7090 * 7091 * Subclasses should override this method to provide a smoother fade transition 7092 * when scrolling occurs. 7093 * 7094 * @return the intensity of the top fade as a float between 0.0f and 1.0f 7095 */ 7096 protected float getTopFadingEdgeStrength() { 7097 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 7098 } 7099 7100 /** 7101 * Returns the strength, or intensity, of the bottom faded edge. The strength is 7102 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7103 * returns 0.0 or 1.0 but no value in between. 7104 * 7105 * Subclasses should override this method to provide a smoother fade transition 7106 * when scrolling occurs. 7107 * 7108 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 7109 */ 7110 protected float getBottomFadingEdgeStrength() { 7111 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 7112 computeVerticalScrollRange() ? 1.0f : 0.0f; 7113 } 7114 7115 /** 7116 * Returns the strength, or intensity, of the left faded edge. The strength is 7117 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7118 * returns 0.0 or 1.0 but no value in between. 7119 * 7120 * Subclasses should override this method to provide a smoother fade transition 7121 * when scrolling occurs. 7122 * 7123 * @return the intensity of the left fade as a float between 0.0f and 1.0f 7124 */ 7125 protected float getLeftFadingEdgeStrength() { 7126 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 7127 } 7128 7129 /** 7130 * Returns the strength, or intensity, of the right faded edge. The strength is 7131 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7132 * returns 0.0 or 1.0 but no value in between. 7133 * 7134 * Subclasses should override this method to provide a smoother fade transition 7135 * when scrolling occurs. 7136 * 7137 * @return the intensity of the right fade as a float between 0.0f and 1.0f 7138 */ 7139 protected float getRightFadingEdgeStrength() { 7140 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 7141 computeHorizontalScrollRange() ? 1.0f : 0.0f; 7142 } 7143 7144 /** 7145 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 7146 * scrollbar is not drawn by default.</p> 7147 * 7148 * @return true if the horizontal scrollbar should be painted, false 7149 * otherwise 7150 * 7151 * @see #setHorizontalScrollBarEnabled(boolean) 7152 */ 7153 public boolean isHorizontalScrollBarEnabled() { 7154 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7155 } 7156 7157 /** 7158 * <p>Define whether the horizontal scrollbar should be drawn or not. The 7159 * scrollbar is not drawn by default.</p> 7160 * 7161 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 7162 * be painted 7163 * 7164 * @see #isHorizontalScrollBarEnabled() 7165 */ 7166 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 7167 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 7168 mViewFlags ^= SCROLLBARS_HORIZONTAL; 7169 computeOpaqueFlags(); 7170 recomputePadding(); 7171 } 7172 } 7173 7174 /** 7175 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 7176 * scrollbar is not drawn by default.</p> 7177 * 7178 * @return true if the vertical scrollbar should be painted, false 7179 * otherwise 7180 * 7181 * @see #setVerticalScrollBarEnabled(boolean) 7182 */ 7183 public boolean isVerticalScrollBarEnabled() { 7184 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 7185 } 7186 7187 /** 7188 * <p>Define whether the vertical scrollbar should be drawn or not. The 7189 * scrollbar is not drawn by default.</p> 7190 * 7191 * @param verticalScrollBarEnabled true if the vertical scrollbar should 7192 * be painted 7193 * 7194 * @see #isVerticalScrollBarEnabled() 7195 */ 7196 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 7197 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 7198 mViewFlags ^= SCROLLBARS_VERTICAL; 7199 computeOpaqueFlags(); 7200 recomputePadding(); 7201 } 7202 } 7203 7204 /** 7205 * @hide 7206 */ 7207 protected void recomputePadding() { 7208 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 7209 } 7210 7211 /** 7212 * Define whether scrollbars will fade when the view is not scrolling. 7213 * 7214 * @param fadeScrollbars wheter to enable fading 7215 * 7216 */ 7217 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 7218 initScrollCache(); 7219 final ScrollabilityCache scrollabilityCache = mScrollCache; 7220 scrollabilityCache.fadeScrollBars = fadeScrollbars; 7221 if (fadeScrollbars) { 7222 scrollabilityCache.state = ScrollabilityCache.OFF; 7223 } else { 7224 scrollabilityCache.state = ScrollabilityCache.ON; 7225 } 7226 } 7227 7228 /** 7229 * 7230 * Returns true if scrollbars will fade when this view is not scrolling 7231 * 7232 * @return true if scrollbar fading is enabled 7233 */ 7234 public boolean isScrollbarFadingEnabled() { 7235 return mScrollCache != null && mScrollCache.fadeScrollBars; 7236 } 7237 7238 /** 7239 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 7240 * inset. When inset, they add to the padding of the view. And the scrollbars 7241 * can be drawn inside the padding area or on the edge of the view. For example, 7242 * if a view has a background drawable and you want to draw the scrollbars 7243 * inside the padding specified by the drawable, you can use 7244 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 7245 * appear at the edge of the view, ignoring the padding, then you can use 7246 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 7247 * @param style the style of the scrollbars. Should be one of 7248 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 7249 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 7250 * @see #SCROLLBARS_INSIDE_OVERLAY 7251 * @see #SCROLLBARS_INSIDE_INSET 7252 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7253 * @see #SCROLLBARS_OUTSIDE_INSET 7254 */ 7255 public void setScrollBarStyle(int style) { 7256 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 7257 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 7258 computeOpaqueFlags(); 7259 recomputePadding(); 7260 } 7261 } 7262 7263 /** 7264 * <p>Returns the current scrollbar style.</p> 7265 * @return the current scrollbar style 7266 * @see #SCROLLBARS_INSIDE_OVERLAY 7267 * @see #SCROLLBARS_INSIDE_INSET 7268 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7269 * @see #SCROLLBARS_OUTSIDE_INSET 7270 */ 7271 public int getScrollBarStyle() { 7272 return mViewFlags & SCROLLBARS_STYLE_MASK; 7273 } 7274 7275 /** 7276 * <p>Compute the horizontal range that the horizontal scrollbar 7277 * represents.</p> 7278 * 7279 * <p>The range is expressed in arbitrary units that must be the same as the 7280 * units used by {@link #computeHorizontalScrollExtent()} and 7281 * {@link #computeHorizontalScrollOffset()}.</p> 7282 * 7283 * <p>The default range is the drawing width of this view.</p> 7284 * 7285 * @return the total horizontal range represented by the horizontal 7286 * scrollbar 7287 * 7288 * @see #computeHorizontalScrollExtent() 7289 * @see #computeHorizontalScrollOffset() 7290 * @see android.widget.ScrollBarDrawable 7291 */ 7292 protected int computeHorizontalScrollRange() { 7293 return getWidth(); 7294 } 7295 7296 /** 7297 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 7298 * within the horizontal range. This value is used to compute the position 7299 * of the thumb within the scrollbar's track.</p> 7300 * 7301 * <p>The range is expressed in arbitrary units that must be the same as the 7302 * units used by {@link #computeHorizontalScrollRange()} and 7303 * {@link #computeHorizontalScrollExtent()}.</p> 7304 * 7305 * <p>The default offset is the scroll offset of this view.</p> 7306 * 7307 * @return the horizontal offset of the scrollbar's thumb 7308 * 7309 * @see #computeHorizontalScrollRange() 7310 * @see #computeHorizontalScrollExtent() 7311 * @see android.widget.ScrollBarDrawable 7312 */ 7313 protected int computeHorizontalScrollOffset() { 7314 return mScrollX; 7315 } 7316 7317 /** 7318 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 7319 * within the horizontal range. This value is used to compute the length 7320 * of the thumb within the scrollbar's track.</p> 7321 * 7322 * <p>The range is expressed in arbitrary units that must be the same as the 7323 * units used by {@link #computeHorizontalScrollRange()} and 7324 * {@link #computeHorizontalScrollOffset()}.</p> 7325 * 7326 * <p>The default extent is the drawing width of this view.</p> 7327 * 7328 * @return the horizontal extent of the scrollbar's thumb 7329 * 7330 * @see #computeHorizontalScrollRange() 7331 * @see #computeHorizontalScrollOffset() 7332 * @see android.widget.ScrollBarDrawable 7333 */ 7334 protected int computeHorizontalScrollExtent() { 7335 return getWidth(); 7336 } 7337 7338 /** 7339 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 7340 * 7341 * <p>The range is expressed in arbitrary units that must be the same as the 7342 * units used by {@link #computeVerticalScrollExtent()} and 7343 * {@link #computeVerticalScrollOffset()}.</p> 7344 * 7345 * @return the total vertical range represented by the vertical scrollbar 7346 * 7347 * <p>The default range is the drawing height of this view.</p> 7348 * 7349 * @see #computeVerticalScrollExtent() 7350 * @see #computeVerticalScrollOffset() 7351 * @see android.widget.ScrollBarDrawable 7352 */ 7353 protected int computeVerticalScrollRange() { 7354 return getHeight(); 7355 } 7356 7357 /** 7358 * <p>Compute the vertical offset of the vertical scrollbar's thumb 7359 * within the horizontal range. This value is used to compute the position 7360 * of the thumb within the scrollbar's track.</p> 7361 * 7362 * <p>The range is expressed in arbitrary units that must be the same as the 7363 * units used by {@link #computeVerticalScrollRange()} and 7364 * {@link #computeVerticalScrollExtent()}.</p> 7365 * 7366 * <p>The default offset is the scroll offset of this view.</p> 7367 * 7368 * @return the vertical offset of the scrollbar's thumb 7369 * 7370 * @see #computeVerticalScrollRange() 7371 * @see #computeVerticalScrollExtent() 7372 * @see android.widget.ScrollBarDrawable 7373 */ 7374 protected int computeVerticalScrollOffset() { 7375 return mScrollY; 7376 } 7377 7378 /** 7379 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 7380 * within the vertical range. This value is used to compute the length 7381 * of the thumb within the scrollbar's track.</p> 7382 * 7383 * <p>The range is expressed in arbitrary units that must be the same as the 7384 * units used by {@link #computeVerticalScrollRange()} and 7385 * {@link #computeVerticalScrollOffset()}.</p> 7386 * 7387 * <p>The default extent is the drawing height of this view.</p> 7388 * 7389 * @return the vertical extent of the scrollbar's thumb 7390 * 7391 * @see #computeVerticalScrollRange() 7392 * @see #computeVerticalScrollOffset() 7393 * @see android.widget.ScrollBarDrawable 7394 */ 7395 protected int computeVerticalScrollExtent() { 7396 return getHeight(); 7397 } 7398 7399 /** 7400 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 7401 * scrollbars are painted only if they have been awakened first.</p> 7402 * 7403 * @param canvas the canvas on which to draw the scrollbars 7404 * 7405 * @see #awakenScrollBars(int) 7406 */ 7407 protected final void onDrawScrollBars(Canvas canvas) { 7408 // scrollbars are drawn only when the animation is running 7409 final ScrollabilityCache cache = mScrollCache; 7410 if (cache != null) { 7411 7412 int state = cache.state; 7413 7414 if (state == ScrollabilityCache.OFF) { 7415 return; 7416 } 7417 7418 boolean invalidate = false; 7419 7420 if (state == ScrollabilityCache.FADING) { 7421 // We're fading -- get our fade interpolation 7422 if (cache.interpolatorValues == null) { 7423 cache.interpolatorValues = new float[1]; 7424 } 7425 7426 float[] values = cache.interpolatorValues; 7427 7428 // Stops the animation if we're done 7429 if (cache.scrollBarInterpolator.timeToValues(values) == 7430 Interpolator.Result.FREEZE_END) { 7431 cache.state = ScrollabilityCache.OFF; 7432 } else { 7433 cache.scrollBar.setAlpha(Math.round(values[0])); 7434 } 7435 7436 // This will make the scroll bars inval themselves after 7437 // drawing. We only want this when we're fading so that 7438 // we prevent excessive redraws 7439 invalidate = true; 7440 } else { 7441 // We're just on -- but we may have been fading before so 7442 // reset alpha 7443 cache.scrollBar.setAlpha(255); 7444 } 7445 7446 7447 final int viewFlags = mViewFlags; 7448 7449 final boolean drawHorizontalScrollBar = 7450 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7451 final boolean drawVerticalScrollBar = 7452 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 7453 && !isVerticalScrollBarHidden(); 7454 7455 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 7456 final int width = mRight - mLeft; 7457 final int height = mBottom - mTop; 7458 7459 final ScrollBarDrawable scrollBar = cache.scrollBar; 7460 int size = scrollBar.getSize(false); 7461 if (size <= 0) { 7462 size = cache.scrollBarSize; 7463 } 7464 7465 final int scrollX = mScrollX; 7466 final int scrollY = mScrollY; 7467 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 7468 7469 int left, top, right, bottom; 7470 7471 if (drawHorizontalScrollBar) { 7472 scrollBar.setParameters(computeHorizontalScrollRange(), 7473 computeHorizontalScrollOffset(), 7474 computeHorizontalScrollExtent(), false); 7475 final int verticalScrollBarGap = drawVerticalScrollBar ? 7476 getVerticalScrollbarWidth() : 0; 7477 top = scrollY + height - size - (mUserPaddingBottom & inside); 7478 left = scrollX + (mPaddingLeft & inside); 7479 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 7480 bottom = top + size; 7481 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 7482 if (invalidate) { 7483 invalidate(left, top, right, bottom); 7484 } 7485 } 7486 7487 if (drawVerticalScrollBar) { 7488 scrollBar.setParameters(computeVerticalScrollRange(), 7489 computeVerticalScrollOffset(), 7490 computeVerticalScrollExtent(), true); 7491 switch (mVerticalScrollbarPosition) { 7492 default: 7493 case SCROLLBAR_POSITION_DEFAULT: 7494 case SCROLLBAR_POSITION_RIGHT: 7495 left = scrollX + width - size - (mUserPaddingRight & inside); 7496 break; 7497 case SCROLLBAR_POSITION_LEFT: 7498 left = scrollX + (mUserPaddingLeft & inside); 7499 break; 7500 } 7501 top = scrollY + (mPaddingTop & inside); 7502 right = left + size; 7503 bottom = scrollY + height - (mUserPaddingBottom & inside); 7504 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 7505 if (invalidate) { 7506 invalidate(left, top, right, bottom); 7507 } 7508 } 7509 } 7510 } 7511 } 7512 7513 /** 7514 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 7515 * FastScroller is visible. 7516 * @return whether to temporarily hide the vertical scrollbar 7517 * @hide 7518 */ 7519 protected boolean isVerticalScrollBarHidden() { 7520 return false; 7521 } 7522 7523 /** 7524 * <p>Draw the horizontal scrollbar if 7525 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 7526 * 7527 * @param canvas the canvas on which to draw the scrollbar 7528 * @param scrollBar the scrollbar's drawable 7529 * 7530 * @see #isHorizontalScrollBarEnabled() 7531 * @see #computeHorizontalScrollRange() 7532 * @see #computeHorizontalScrollExtent() 7533 * @see #computeHorizontalScrollOffset() 7534 * @see android.widget.ScrollBarDrawable 7535 * @hide 7536 */ 7537 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 7538 int l, int t, int r, int b) { 7539 scrollBar.setBounds(l, t, r, b); 7540 scrollBar.draw(canvas); 7541 } 7542 7543 /** 7544 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 7545 * returns true.</p> 7546 * 7547 * @param canvas the canvas on which to draw the scrollbar 7548 * @param scrollBar the scrollbar's drawable 7549 * 7550 * @see #isVerticalScrollBarEnabled() 7551 * @see #computeVerticalScrollRange() 7552 * @see #computeVerticalScrollExtent() 7553 * @see #computeVerticalScrollOffset() 7554 * @see android.widget.ScrollBarDrawable 7555 * @hide 7556 */ 7557 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 7558 int l, int t, int r, int b) { 7559 scrollBar.setBounds(l, t, r, b); 7560 scrollBar.draw(canvas); 7561 } 7562 7563 /** 7564 * Implement this to do your drawing. 7565 * 7566 * @param canvas the canvas on which the background will be drawn 7567 */ 7568 protected void onDraw(Canvas canvas) { 7569 } 7570 7571 /* 7572 * Caller is responsible for calling requestLayout if necessary. 7573 * (This allows addViewInLayout to not request a new layout.) 7574 */ 7575 void assignParent(ViewParent parent) { 7576 if (mParent == null) { 7577 mParent = parent; 7578 } else if (parent == null) { 7579 mParent = null; 7580 } else { 7581 throw new RuntimeException("view " + this + " being added, but" 7582 + " it already has a parent"); 7583 } 7584 } 7585 7586 /** 7587 * This is called when the view is attached to a window. At this point it 7588 * has a Surface and will start drawing. Note that this function is 7589 * guaranteed to be called before {@link #onDraw}, however it may be called 7590 * any time before the first onDraw -- including before or after 7591 * {@link #onMeasure}. 7592 * 7593 * @see #onDetachedFromWindow() 7594 */ 7595 protected void onAttachedToWindow() { 7596 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 7597 mParent.requestTransparentRegion(this); 7598 } 7599 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 7600 initialAwakenScrollBars(); 7601 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 7602 } 7603 jumpDrawablesToCurrentState(); 7604 } 7605 7606 /** 7607 * This is called when the view is detached from a window. At this point it 7608 * no longer has a surface for drawing. 7609 * 7610 * @see #onAttachedToWindow() 7611 */ 7612 protected void onDetachedFromWindow() { 7613 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 7614 7615 removeUnsetPressCallback(); 7616 removeLongPressCallback(); 7617 7618 destroyDrawingCache(); 7619 7620 if (mHardwareLayer != null) { 7621 mHardwareLayer.destroy(); 7622 mHardwareLayer = null; 7623 } 7624 7625 if (mAttachInfo != null) { 7626 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 7627 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_RECT_MSG, this); 7628 } 7629 7630 mCurrentAnimation = null; 7631 } 7632 7633 /** 7634 * @return The number of times this view has been attached to a window 7635 */ 7636 protected int getWindowAttachCount() { 7637 return mWindowAttachCount; 7638 } 7639 7640 /** 7641 * Retrieve a unique token identifying the window this view is attached to. 7642 * @return Return the window's token for use in 7643 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 7644 */ 7645 public IBinder getWindowToken() { 7646 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 7647 } 7648 7649 /** 7650 * Retrieve a unique token identifying the top-level "real" window of 7651 * the window that this view is attached to. That is, this is like 7652 * {@link #getWindowToken}, except if the window this view in is a panel 7653 * window (attached to another containing window), then the token of 7654 * the containing window is returned instead. 7655 * 7656 * @return Returns the associated window token, either 7657 * {@link #getWindowToken()} or the containing window's token. 7658 */ 7659 public IBinder getApplicationWindowToken() { 7660 AttachInfo ai = mAttachInfo; 7661 if (ai != null) { 7662 IBinder appWindowToken = ai.mPanelParentWindowToken; 7663 if (appWindowToken == null) { 7664 appWindowToken = ai.mWindowToken; 7665 } 7666 return appWindowToken; 7667 } 7668 return null; 7669 } 7670 7671 /** 7672 * Retrieve private session object this view hierarchy is using to 7673 * communicate with the window manager. 7674 * @return the session object to communicate with the window manager 7675 */ 7676 /*package*/ IWindowSession getWindowSession() { 7677 return mAttachInfo != null ? mAttachInfo.mSession : null; 7678 } 7679 7680 /** 7681 * @param info the {@link android.view.View.AttachInfo} to associated with 7682 * this view 7683 */ 7684 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 7685 //System.out.println("Attached! " + this); 7686 mAttachInfo = info; 7687 mWindowAttachCount++; 7688 // We will need to evaluate the drawable state at least once. 7689 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 7690 if (mFloatingTreeObserver != null) { 7691 info.mTreeObserver.merge(mFloatingTreeObserver); 7692 mFloatingTreeObserver = null; 7693 } 7694 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 7695 mAttachInfo.mScrollContainers.add(this); 7696 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 7697 } 7698 performCollectViewAttributes(visibility); 7699 onAttachedToWindow(); 7700 int vis = info.mWindowVisibility; 7701 if (vis != GONE) { 7702 onWindowVisibilityChanged(vis); 7703 } 7704 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 7705 // If nobody has evaluated the drawable state yet, then do it now. 7706 refreshDrawableState(); 7707 } 7708 } 7709 7710 void dispatchDetachedFromWindow() { 7711 //System.out.println("Detached! " + this); 7712 AttachInfo info = mAttachInfo; 7713 if (info != null) { 7714 int vis = info.mWindowVisibility; 7715 if (vis != GONE) { 7716 onWindowVisibilityChanged(GONE); 7717 } 7718 } 7719 7720 onDetachedFromWindow(); 7721 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 7722 mAttachInfo.mScrollContainers.remove(this); 7723 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 7724 } 7725 mAttachInfo = null; 7726 } 7727 7728 /** 7729 * Store this view hierarchy's frozen state into the given container. 7730 * 7731 * @param container The SparseArray in which to save the view's state. 7732 * 7733 * @see #restoreHierarchyState 7734 * @see #dispatchSaveInstanceState 7735 * @see #onSaveInstanceState 7736 */ 7737 public void saveHierarchyState(SparseArray<Parcelable> container) { 7738 dispatchSaveInstanceState(container); 7739 } 7740 7741 /** 7742 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 7743 * May be overridden to modify how freezing happens to a view's children; for example, some 7744 * views may want to not store state for their children. 7745 * 7746 * @param container The SparseArray in which to save the view's state. 7747 * 7748 * @see #dispatchRestoreInstanceState 7749 * @see #saveHierarchyState 7750 * @see #onSaveInstanceState 7751 */ 7752 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 7753 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 7754 mPrivateFlags &= ~SAVE_STATE_CALLED; 7755 Parcelable state = onSaveInstanceState(); 7756 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7757 throw new IllegalStateException( 7758 "Derived class did not call super.onSaveInstanceState()"); 7759 } 7760 if (state != null) { 7761 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 7762 // + ": " + state); 7763 container.put(mID, state); 7764 } 7765 } 7766 } 7767 7768 /** 7769 * Hook allowing a view to generate a representation of its internal state 7770 * that can later be used to create a new instance with that same state. 7771 * This state should only contain information that is not persistent or can 7772 * not be reconstructed later. For example, you will never store your 7773 * current position on screen because that will be computed again when a 7774 * new instance of the view is placed in its view hierarchy. 7775 * <p> 7776 * Some examples of things you may store here: the current cursor position 7777 * in a text view (but usually not the text itself since that is stored in a 7778 * content provider or other persistent storage), the currently selected 7779 * item in a list view. 7780 * 7781 * @return Returns a Parcelable object containing the view's current dynamic 7782 * state, or null if there is nothing interesting to save. The 7783 * default implementation returns null. 7784 * @see #onRestoreInstanceState 7785 * @see #saveHierarchyState 7786 * @see #dispatchSaveInstanceState 7787 * @see #setSaveEnabled(boolean) 7788 */ 7789 protected Parcelable onSaveInstanceState() { 7790 mPrivateFlags |= SAVE_STATE_CALLED; 7791 return BaseSavedState.EMPTY_STATE; 7792 } 7793 7794 /** 7795 * Restore this view hierarchy's frozen state from the given container. 7796 * 7797 * @param container The SparseArray which holds previously frozen states. 7798 * 7799 * @see #saveHierarchyState 7800 * @see #dispatchRestoreInstanceState 7801 * @see #onRestoreInstanceState 7802 */ 7803 public void restoreHierarchyState(SparseArray<Parcelable> container) { 7804 dispatchRestoreInstanceState(container); 7805 } 7806 7807 /** 7808 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 7809 * children. May be overridden to modify how restoreing happens to a view's children; for 7810 * example, some views may want to not store state for their children. 7811 * 7812 * @param container The SparseArray which holds previously saved state. 7813 * 7814 * @see #dispatchSaveInstanceState 7815 * @see #restoreHierarchyState 7816 * @see #onRestoreInstanceState 7817 */ 7818 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 7819 if (mID != NO_ID) { 7820 Parcelable state = container.get(mID); 7821 if (state != null) { 7822 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 7823 // + ": " + state); 7824 mPrivateFlags &= ~SAVE_STATE_CALLED; 7825 onRestoreInstanceState(state); 7826 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7827 throw new IllegalStateException( 7828 "Derived class did not call super.onRestoreInstanceState()"); 7829 } 7830 } 7831 } 7832 } 7833 7834 /** 7835 * Hook allowing a view to re-apply a representation of its internal state that had previously 7836 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 7837 * null state. 7838 * 7839 * @param state The frozen state that had previously been returned by 7840 * {@link #onSaveInstanceState}. 7841 * 7842 * @see #onSaveInstanceState 7843 * @see #restoreHierarchyState 7844 * @see #dispatchRestoreInstanceState 7845 */ 7846 protected void onRestoreInstanceState(Parcelable state) { 7847 mPrivateFlags |= SAVE_STATE_CALLED; 7848 if (state != BaseSavedState.EMPTY_STATE && state != null) { 7849 throw new IllegalArgumentException("Wrong state class, expecting View State but " 7850 + "received " + state.getClass().toString() + " instead. This usually happens " 7851 + "when two views of different type have the same id in the same hierarchy. " 7852 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 7853 + "other views do not use the same id."); 7854 } 7855 } 7856 7857 /** 7858 * <p>Return the time at which the drawing of the view hierarchy started.</p> 7859 * 7860 * @return the drawing start time in milliseconds 7861 */ 7862 public long getDrawingTime() { 7863 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 7864 } 7865 7866 /** 7867 * <p>Enables or disables the duplication of the parent's state into this view. When 7868 * duplication is enabled, this view gets its drawable state from its parent rather 7869 * than from its own internal properties.</p> 7870 * 7871 * <p>Note: in the current implementation, setting this property to true after the 7872 * view was added to a ViewGroup might have no effect at all. This property should 7873 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 7874 * 7875 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 7876 * property is enabled, an exception will be thrown.</p> 7877 * 7878 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 7879 * parent, these states should not be affected by this method.</p> 7880 * 7881 * @param enabled True to enable duplication of the parent's drawable state, false 7882 * to disable it. 7883 * 7884 * @see #getDrawableState() 7885 * @see #isDuplicateParentStateEnabled() 7886 */ 7887 public void setDuplicateParentStateEnabled(boolean enabled) { 7888 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 7889 } 7890 7891 /** 7892 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 7893 * 7894 * @return True if this view's drawable state is duplicated from the parent, 7895 * false otherwise 7896 * 7897 * @see #getDrawableState() 7898 * @see #setDuplicateParentStateEnabled(boolean) 7899 */ 7900 public boolean isDuplicateParentStateEnabled() { 7901 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 7902 } 7903 7904 /** 7905 * <p>Specifies the type of layer backing this view. The layer can be 7906 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 7907 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 7908 * 7909 * <p>A layer is associated with an optional {@link android.graphics.Paint} 7910 * instance that controls how the layer is composed on screen. The following 7911 * properties of the paint are taken into account when composing the layer:</p> 7912 * <ul> 7913 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 7914 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 7915 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 7916 * </ul> 7917 * 7918 * <p>If this view has an alpha value set to < 1.0 by calling 7919 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 7920 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 7921 * equivalent to setting a hardware layer on this view and providing a paint with 7922 * the desired alpha value.<p> 7923 * 7924 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 7925 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 7926 * for more information on when and how to use layers.</p> 7927 * 7928 * @param layerType The ype of layer to use with this view, must be one of 7929 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7930 * {@link #LAYER_TYPE_HARDWARE} 7931 * @param paint The paint used to compose the layer. This argument is optional 7932 * and can be null. It is ignored when the layer type is 7933 * {@link #LAYER_TYPE_NONE} 7934 * 7935 * @see #getLayerType() 7936 * @see #LAYER_TYPE_NONE 7937 * @see #LAYER_TYPE_SOFTWARE 7938 * @see #LAYER_TYPE_HARDWARE 7939 * @see #setAlpha(float) 7940 * 7941 * @attr ref android.R.styleable#View_layerType 7942 */ 7943 public void setLayerType(int layerType, Paint paint) { 7944 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 7945 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 7946 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 7947 } 7948 7949 if (layerType == mLayerType) { 7950 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 7951 mLayerPaint = paint == null ? new Paint() : paint; 7952 if (mParent instanceof ViewGroup) { 7953 ((ViewGroup) mParent).invalidate(); 7954 } 7955 invalidate(); 7956 } 7957 return; 7958 } 7959 7960 // Destroy any previous software drawing cache if needed 7961 switch (mLayerType) { 7962 case LAYER_TYPE_SOFTWARE: 7963 if (mDrawingCache != null) { 7964 mDrawingCache.recycle(); 7965 mDrawingCache = null; 7966 } 7967 7968 if (mUnscaledDrawingCache != null) { 7969 mUnscaledDrawingCache.recycle(); 7970 mUnscaledDrawingCache = null; 7971 } 7972 break; 7973 case LAYER_TYPE_HARDWARE: 7974 if (mHardwareLayer != null) { 7975 mHardwareLayer.destroy(); 7976 mHardwareLayer = null; 7977 } 7978 break; 7979 default: 7980 break; 7981 } 7982 7983 mLayerType = layerType; 7984 mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : (paint == null ? new Paint() : paint); 7985 7986 if (mParent instanceof ViewGroup) { 7987 ((ViewGroup) mParent).invalidate(); 7988 } 7989 invalidate(); 7990 } 7991 7992 /** 7993 * Indicates what type of layer is currently associated with this view. By default 7994 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 7995 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 7996 * for more information on the different types of layers. 7997 * 7998 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7999 * {@link #LAYER_TYPE_HARDWARE} 8000 * 8001 * @see #setLayerType(int, android.graphics.Paint) 8002 * @see #LAYER_TYPE_NONE 8003 * @see #LAYER_TYPE_SOFTWARE 8004 * @see #LAYER_TYPE_HARDWARE 8005 */ 8006 public int getLayerType() { 8007 return mLayerType; 8008 } 8009 8010 /** 8011 * <p>Returns a hardware layer that can be used to draw this view again 8012 * without executing its draw method.</p> 8013 * 8014 * @return A HardwareLayer ready to render, or null if an error occurred. 8015 */ 8016 HardwareLayer getHardwareLayer(Canvas currentCanvas) { 8017 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8018 return null; 8019 } 8020 8021 final int width = mRight - mLeft; 8022 final int height = mBottom - mTop; 8023 8024 if (width == 0 || height == 0) { 8025 return null; 8026 } 8027 8028 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 8029 if (mHardwareLayer == null) { 8030 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 8031 width, height, isOpaque()); 8032 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 8033 mHardwareLayer.resize(width, height); 8034 } 8035 8036 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 8037 try { 8038 canvas.setViewport(width, height); 8039 canvas.onPreDraw(); 8040 8041 computeScroll(); 8042 canvas.translate(-mScrollX, -mScrollY); 8043 8044 final int restoreCount = canvas.save(); 8045 8046 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8047 8048 // Fast path for layouts with no backgrounds 8049 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8050 mPrivateFlags &= ~DIRTY_MASK; 8051 dispatchDraw(canvas); 8052 } else { 8053 draw(canvas); 8054 } 8055 8056 canvas.restoreToCount(restoreCount); 8057 } finally { 8058 canvas.onPostDraw(); 8059 mHardwareLayer.end(currentCanvas); 8060 } 8061 } 8062 8063 return mHardwareLayer; 8064 } 8065 8066 /** 8067 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 8068 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 8069 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 8070 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 8071 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 8072 * null.</p> 8073 * 8074 * <p>Enabling the drawing cache is similar to 8075 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 8076 * acceleration is turned off. When hardware acceleration is turned on enabling the 8077 * drawing cache has either no effect or the cache used at drawing time is not a bitmap. 8078 * This API can however be used to manually generate a bitmap copy of this view.</p> 8079 * 8080 * @param enabled true to enable the drawing cache, false otherwise 8081 * 8082 * @see #isDrawingCacheEnabled() 8083 * @see #getDrawingCache() 8084 * @see #buildDrawingCache() 8085 * @see #setLayerType(int, android.graphics.Paint) 8086 */ 8087 public void setDrawingCacheEnabled(boolean enabled) { 8088 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 8089 } 8090 8091 /** 8092 * <p>Indicates whether the drawing cache is enabled for this view.</p> 8093 * 8094 * @return true if the drawing cache is enabled 8095 * 8096 * @see #setDrawingCacheEnabled(boolean) 8097 * @see #getDrawingCache() 8098 */ 8099 @ViewDebug.ExportedProperty(category = "drawing") 8100 public boolean isDrawingCacheEnabled() { 8101 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 8102 } 8103 8104 /** 8105 * <p>Returns a display list that can be used to draw this view again 8106 * without executing its draw method.</p> 8107 * 8108 * @return A DisplayList ready to replay, or null if caching is not enabled. 8109 */ 8110 DisplayList getDisplayList() { 8111 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8112 return null; 8113 } 8114 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8115 return null; 8116 } 8117 8118 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED && 8119 ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 8120 mDisplayList == null || !mDisplayList.isValid())) { 8121 8122 if (mDisplayList == null) { 8123 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 8124 } 8125 8126 final HardwareCanvas canvas = mDisplayList.start(); 8127 try { 8128 int width = mRight - mLeft; 8129 int height = mBottom - mTop; 8130 8131 canvas.setViewport(width, height); 8132 canvas.onPreDraw(); 8133 8134 final int restoreCount = canvas.save(); 8135 8136 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8137 8138 // Fast path for layouts with no backgrounds 8139 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8140 mPrivateFlags &= ~DIRTY_MASK; 8141 dispatchDraw(canvas); 8142 } else { 8143 draw(canvas); 8144 } 8145 8146 canvas.restoreToCount(restoreCount); 8147 } finally { 8148 canvas.onPostDraw(); 8149 8150 mDisplayList.end(); 8151 } 8152 } 8153 8154 return mDisplayList; 8155 } 8156 8157 /** 8158 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 8159 * 8160 * @return A non-scaled bitmap representing this view or null if cache is disabled. 8161 * 8162 * @see #getDrawingCache(boolean) 8163 */ 8164 public Bitmap getDrawingCache() { 8165 return getDrawingCache(false); 8166 } 8167 8168 /** 8169 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 8170 * is null when caching is disabled. If caching is enabled and the cache is not ready, 8171 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 8172 * draw from the cache when the cache is enabled. To benefit from the cache, you must 8173 * request the drawing cache by calling this method and draw it on screen if the 8174 * returned bitmap is not null.</p> 8175 * 8176 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8177 * this method will create a bitmap of the same size as this view. Because this bitmap 8178 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8179 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8180 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8181 * size than the view. This implies that your application must be able to handle this 8182 * size.</p> 8183 * 8184 * @param autoScale Indicates whether the generated bitmap should be scaled based on 8185 * the current density of the screen when the application is in compatibility 8186 * mode. 8187 * 8188 * @return A bitmap representing this view or null if cache is disabled. 8189 * 8190 * @see #setDrawingCacheEnabled(boolean) 8191 * @see #isDrawingCacheEnabled() 8192 * @see #buildDrawingCache(boolean) 8193 * @see #destroyDrawingCache() 8194 */ 8195 public Bitmap getDrawingCache(boolean autoScale) { 8196 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8197 return null; 8198 } 8199 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 8200 buildDrawingCache(autoScale); 8201 } 8202 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 8203 } 8204 8205 /** 8206 * <p>Frees the resources used by the drawing cache. If you call 8207 * {@link #buildDrawingCache()} manually without calling 8208 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8209 * should cleanup the cache with this method afterwards.</p> 8210 * 8211 * @see #setDrawingCacheEnabled(boolean) 8212 * @see #buildDrawingCache() 8213 * @see #getDrawingCache() 8214 */ 8215 public void destroyDrawingCache() { 8216 if (mDrawingCache != null) { 8217 mDrawingCache.recycle(); 8218 mDrawingCache = null; 8219 } 8220 if (mUnscaledDrawingCache != null) { 8221 mUnscaledDrawingCache.recycle(); 8222 mUnscaledDrawingCache = null; 8223 } 8224 if (mDisplayList != null) { 8225 mDisplayList.invalidate(); 8226 } 8227 } 8228 8229 /** 8230 * Setting a solid background color for the drawing cache's bitmaps will improve 8231 * perfromance and memory usage. Note, though that this should only be used if this 8232 * view will always be drawn on top of a solid color. 8233 * 8234 * @param color The background color to use for the drawing cache's bitmap 8235 * 8236 * @see #setDrawingCacheEnabled(boolean) 8237 * @see #buildDrawingCache() 8238 * @see #getDrawingCache() 8239 */ 8240 public void setDrawingCacheBackgroundColor(int color) { 8241 if (color != mDrawingCacheBackgroundColor) { 8242 mDrawingCacheBackgroundColor = color; 8243 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8244 } 8245 } 8246 8247 /** 8248 * @see #setDrawingCacheBackgroundColor(int) 8249 * 8250 * @return The background color to used for the drawing cache's bitmap 8251 */ 8252 public int getDrawingCacheBackgroundColor() { 8253 return mDrawingCacheBackgroundColor; 8254 } 8255 8256 /** 8257 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 8258 * 8259 * @see #buildDrawingCache(boolean) 8260 */ 8261 public void buildDrawingCache() { 8262 buildDrawingCache(false); 8263 } 8264 8265 /** 8266 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 8267 * 8268 * <p>If you call {@link #buildDrawingCache()} manually without calling 8269 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8270 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 8271 * 8272 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8273 * this method will create a bitmap of the same size as this view. Because this bitmap 8274 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8275 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8276 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8277 * size than the view. This implies that your application must be able to handle this 8278 * size.</p> 8279 * 8280 * <p>You should avoid calling this method when hardware acceleration is enabled. If 8281 * you do not need the drawing cache bitmap, calling this method will increase memory 8282 * usage and cause the view to be rendered in software once, thus negatively impacting 8283 * performance.</p> 8284 * 8285 * @see #getDrawingCache() 8286 * @see #destroyDrawingCache() 8287 */ 8288 public void buildDrawingCache(boolean autoScale) { 8289 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 8290 mDrawingCache == null : mUnscaledDrawingCache == null)) { 8291 8292 if (ViewDebug.TRACE_HIERARCHY) { 8293 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 8294 } 8295 8296 int width = mRight - mLeft; 8297 int height = mBottom - mTop; 8298 8299 final AttachInfo attachInfo = mAttachInfo; 8300 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 8301 8302 if (autoScale && scalingRequired) { 8303 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 8304 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 8305 } 8306 8307 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 8308 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 8309 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 8310 8311 if (width <= 0 || height <= 0 || 8312 // Projected bitmap size in bytes 8313 (width * height * (opaque && !use32BitCache ? 2 : 4) > 8314 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 8315 destroyDrawingCache(); 8316 return; 8317 } 8318 8319 boolean clear = true; 8320 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 8321 8322 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 8323 Bitmap.Config quality; 8324 if (!opaque) { 8325 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 8326 case DRAWING_CACHE_QUALITY_AUTO: 8327 quality = Bitmap.Config.ARGB_8888; 8328 break; 8329 case DRAWING_CACHE_QUALITY_LOW: 8330 quality = Bitmap.Config.ARGB_4444; 8331 break; 8332 case DRAWING_CACHE_QUALITY_HIGH: 8333 quality = Bitmap.Config.ARGB_8888; 8334 break; 8335 default: 8336 quality = Bitmap.Config.ARGB_8888; 8337 break; 8338 } 8339 } else { 8340 // Optimization for translucent windows 8341 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 8342 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 8343 } 8344 8345 // Try to cleanup memory 8346 if (bitmap != null) bitmap.recycle(); 8347 8348 try { 8349 bitmap = Bitmap.createBitmap(width, height, quality); 8350 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8351 if (autoScale) { 8352 mDrawingCache = bitmap; 8353 } else { 8354 mUnscaledDrawingCache = bitmap; 8355 } 8356 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 8357 } catch (OutOfMemoryError e) { 8358 // If there is not enough memory to create the bitmap cache, just 8359 // ignore the issue as bitmap caches are not required to draw the 8360 // view hierarchy 8361 if (autoScale) { 8362 mDrawingCache = null; 8363 } else { 8364 mUnscaledDrawingCache = null; 8365 } 8366 return; 8367 } 8368 8369 clear = drawingCacheBackgroundColor != 0; 8370 } 8371 8372 Canvas canvas; 8373 if (attachInfo != null) { 8374 canvas = attachInfo.mCanvas; 8375 if (canvas == null) { 8376 canvas = new Canvas(); 8377 } 8378 canvas.setBitmap(bitmap); 8379 // Temporarily clobber the cached Canvas in case one of our children 8380 // is also using a drawing cache. Without this, the children would 8381 // steal the canvas by attaching their own bitmap to it and bad, bad 8382 // thing would happen (invisible views, corrupted drawings, etc.) 8383 attachInfo.mCanvas = null; 8384 } else { 8385 // This case should hopefully never or seldom happen 8386 canvas = new Canvas(bitmap); 8387 } 8388 8389 if (clear) { 8390 bitmap.eraseColor(drawingCacheBackgroundColor); 8391 } 8392 8393 computeScroll(); 8394 final int restoreCount = canvas.save(); 8395 8396 if (autoScale && scalingRequired) { 8397 final float scale = attachInfo.mApplicationScale; 8398 canvas.scale(scale, scale); 8399 } 8400 8401 canvas.translate(-mScrollX, -mScrollY); 8402 8403 mPrivateFlags |= DRAWN; 8404 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 8405 mLayerType != LAYER_TYPE_NONE) { 8406 mPrivateFlags |= DRAWING_CACHE_VALID; 8407 } 8408 8409 // Fast path for layouts with no backgrounds 8410 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8411 if (ViewDebug.TRACE_HIERARCHY) { 8412 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8413 } 8414 mPrivateFlags &= ~DIRTY_MASK; 8415 dispatchDraw(canvas); 8416 } else { 8417 draw(canvas); 8418 } 8419 8420 canvas.restoreToCount(restoreCount); 8421 8422 if (attachInfo != null) { 8423 // Restore the cached Canvas for our siblings 8424 attachInfo.mCanvas = canvas; 8425 } 8426 } 8427 } 8428 8429 /** 8430 * Create a snapshot of the view into a bitmap. We should probably make 8431 * some form of this public, but should think about the API. 8432 */ 8433 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 8434 int width = mRight - mLeft; 8435 int height = mBottom - mTop; 8436 8437 final AttachInfo attachInfo = mAttachInfo; 8438 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 8439 width = (int) ((width * scale) + 0.5f); 8440 height = (int) ((height * scale) + 0.5f); 8441 8442 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 8443 if (bitmap == null) { 8444 throw new OutOfMemoryError(); 8445 } 8446 8447 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8448 8449 Canvas canvas; 8450 if (attachInfo != null) { 8451 canvas = attachInfo.mCanvas; 8452 if (canvas == null) { 8453 canvas = new Canvas(); 8454 } 8455 canvas.setBitmap(bitmap); 8456 // Temporarily clobber the cached Canvas in case one of our children 8457 // is also using a drawing cache. Without this, the children would 8458 // steal the canvas by attaching their own bitmap to it and bad, bad 8459 // things would happen (invisible views, corrupted drawings, etc.) 8460 attachInfo.mCanvas = null; 8461 } else { 8462 // This case should hopefully never or seldom happen 8463 canvas = new Canvas(bitmap); 8464 } 8465 8466 if ((backgroundColor & 0xff000000) != 0) { 8467 bitmap.eraseColor(backgroundColor); 8468 } 8469 8470 computeScroll(); 8471 final int restoreCount = canvas.save(); 8472 canvas.scale(scale, scale); 8473 canvas.translate(-mScrollX, -mScrollY); 8474 8475 // Temporarily remove the dirty mask 8476 int flags = mPrivateFlags; 8477 mPrivateFlags &= ~DIRTY_MASK; 8478 8479 // Fast path for layouts with no backgrounds 8480 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8481 dispatchDraw(canvas); 8482 } else { 8483 draw(canvas); 8484 } 8485 8486 mPrivateFlags = flags; 8487 8488 canvas.restoreToCount(restoreCount); 8489 8490 if (attachInfo != null) { 8491 // Restore the cached Canvas for our siblings 8492 attachInfo.mCanvas = canvas; 8493 } 8494 8495 return bitmap; 8496 } 8497 8498 /** 8499 * Indicates whether this View is currently in edit mode. A View is usually 8500 * in edit mode when displayed within a developer tool. For instance, if 8501 * this View is being drawn by a visual user interface builder, this method 8502 * should return true. 8503 * 8504 * Subclasses should check the return value of this method to provide 8505 * different behaviors if their normal behavior might interfere with the 8506 * host environment. For instance: the class spawns a thread in its 8507 * constructor, the drawing code relies on device-specific features, etc. 8508 * 8509 * This method is usually checked in the drawing code of custom widgets. 8510 * 8511 * @return True if this View is in edit mode, false otherwise. 8512 */ 8513 public boolean isInEditMode() { 8514 return false; 8515 } 8516 8517 /** 8518 * If the View draws content inside its padding and enables fading edges, 8519 * it needs to support padding offsets. Padding offsets are added to the 8520 * fading edges to extend the length of the fade so that it covers pixels 8521 * drawn inside the padding. 8522 * 8523 * Subclasses of this class should override this method if they need 8524 * to draw content inside the padding. 8525 * 8526 * @return True if padding offset must be applied, false otherwise. 8527 * 8528 * @see #getLeftPaddingOffset() 8529 * @see #getRightPaddingOffset() 8530 * @see #getTopPaddingOffset() 8531 * @see #getBottomPaddingOffset() 8532 * 8533 * @since CURRENT 8534 */ 8535 protected boolean isPaddingOffsetRequired() { 8536 return false; 8537 } 8538 8539 /** 8540 * Amount by which to extend the left fading region. Called only when 8541 * {@link #isPaddingOffsetRequired()} returns true. 8542 * 8543 * @return The left padding offset in pixels. 8544 * 8545 * @see #isPaddingOffsetRequired() 8546 * 8547 * @since CURRENT 8548 */ 8549 protected int getLeftPaddingOffset() { 8550 return 0; 8551 } 8552 8553 /** 8554 * Amount by which to extend the right fading region. Called only when 8555 * {@link #isPaddingOffsetRequired()} returns true. 8556 * 8557 * @return The right padding offset in pixels. 8558 * 8559 * @see #isPaddingOffsetRequired() 8560 * 8561 * @since CURRENT 8562 */ 8563 protected int getRightPaddingOffset() { 8564 return 0; 8565 } 8566 8567 /** 8568 * Amount by which to extend the top fading region. Called only when 8569 * {@link #isPaddingOffsetRequired()} returns true. 8570 * 8571 * @return The top padding offset in pixels. 8572 * 8573 * @see #isPaddingOffsetRequired() 8574 * 8575 * @since CURRENT 8576 */ 8577 protected int getTopPaddingOffset() { 8578 return 0; 8579 } 8580 8581 /** 8582 * Amount by which to extend the bottom fading region. Called only when 8583 * {@link #isPaddingOffsetRequired()} returns true. 8584 * 8585 * @return The bottom padding offset in pixels. 8586 * 8587 * @see #isPaddingOffsetRequired() 8588 * 8589 * @since CURRENT 8590 */ 8591 protected int getBottomPaddingOffset() { 8592 return 0; 8593 } 8594 8595 /** 8596 * <p>Indicates whether this view is attached to an hardware accelerated 8597 * window or not.</p> 8598 * 8599 * <p>Even if this method returns true, it does not mean that every call 8600 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 8601 * accelerated {@link android.graphics.Canvas}. For instance, if this view 8602 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 8603 * window is hardware accelerated, 8604 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 8605 * return false, and this method will return true.</p> 8606 * 8607 * @return True if the view is attached to a window and the window is 8608 * hardware accelerated; false in any other case. 8609 */ 8610 public boolean isHardwareAccelerated() { 8611 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 8612 } 8613 8614 /** 8615 * Manually render this view (and all of its children) to the given Canvas. 8616 * The view must have already done a full layout before this function is 8617 * called. When implementing a view, implement {@link #onDraw} instead of 8618 * overriding this method. If you do need to override this method, call 8619 * the superclass version. 8620 * 8621 * @param canvas The Canvas to which the View is rendered. 8622 */ 8623 public void draw(Canvas canvas) { 8624 if (ViewDebug.TRACE_HIERARCHY) { 8625 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8626 } 8627 8628 final int privateFlags = mPrivateFlags; 8629 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 8630 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 8631 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 8632 8633 /* 8634 * Draw traversal performs several drawing steps which must be executed 8635 * in the appropriate order: 8636 * 8637 * 1. Draw the background 8638 * 2. If necessary, save the canvas' layers to prepare for fading 8639 * 3. Draw view's content 8640 * 4. Draw children 8641 * 5. If necessary, draw the fading edges and restore layers 8642 * 6. Draw decorations (scrollbars for instance) 8643 */ 8644 8645 // Step 1, draw the background, if needed 8646 int saveCount; 8647 8648 if (!dirtyOpaque) { 8649 final Drawable background = mBGDrawable; 8650 if (background != null) { 8651 final int scrollX = mScrollX; 8652 final int scrollY = mScrollY; 8653 8654 if (mBackgroundSizeChanged) { 8655 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 8656 mBackgroundSizeChanged = false; 8657 } 8658 8659 if ((scrollX | scrollY) == 0) { 8660 background.draw(canvas); 8661 } else { 8662 canvas.translate(scrollX, scrollY); 8663 background.draw(canvas); 8664 canvas.translate(-scrollX, -scrollY); 8665 } 8666 } 8667 } 8668 8669 // skip step 2 & 5 if possible (common case) 8670 final int viewFlags = mViewFlags; 8671 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 8672 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 8673 if (!verticalEdges && !horizontalEdges) { 8674 // Step 3, draw the content 8675 if (!dirtyOpaque) onDraw(canvas); 8676 8677 // Step 4, draw the children 8678 dispatchDraw(canvas); 8679 8680 // Step 6, draw decorations (scrollbars) 8681 onDrawScrollBars(canvas); 8682 8683 // we're done... 8684 return; 8685 } 8686 8687 /* 8688 * Here we do the full fledged routine... 8689 * (this is an uncommon case where speed matters less, 8690 * this is why we repeat some of the tests that have been 8691 * done above) 8692 */ 8693 8694 boolean drawTop = false; 8695 boolean drawBottom = false; 8696 boolean drawLeft = false; 8697 boolean drawRight = false; 8698 8699 float topFadeStrength = 0.0f; 8700 float bottomFadeStrength = 0.0f; 8701 float leftFadeStrength = 0.0f; 8702 float rightFadeStrength = 0.0f; 8703 8704 // Step 2, save the canvas' layers 8705 int paddingLeft = mPaddingLeft; 8706 int paddingTop = mPaddingTop; 8707 8708 final boolean offsetRequired = isPaddingOffsetRequired(); 8709 if (offsetRequired) { 8710 paddingLeft += getLeftPaddingOffset(); 8711 paddingTop += getTopPaddingOffset(); 8712 } 8713 8714 int left = mScrollX + paddingLeft; 8715 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 8716 int top = mScrollY + paddingTop; 8717 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 8718 8719 if (offsetRequired) { 8720 right += getRightPaddingOffset(); 8721 bottom += getBottomPaddingOffset(); 8722 } 8723 8724 final ScrollabilityCache scrollabilityCache = mScrollCache; 8725 int length = scrollabilityCache.fadingEdgeLength; 8726 8727 // clip the fade length if top and bottom fades overlap 8728 // overlapping fades produce odd-looking artifacts 8729 if (verticalEdges && (top + length > bottom - length)) { 8730 length = (bottom - top) / 2; 8731 } 8732 8733 // also clip horizontal fades if necessary 8734 if (horizontalEdges && (left + length > right - length)) { 8735 length = (right - left) / 2; 8736 } 8737 8738 if (verticalEdges) { 8739 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 8740 drawTop = topFadeStrength > 0.0f; 8741 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 8742 drawBottom = bottomFadeStrength > 0.0f; 8743 } 8744 8745 if (horizontalEdges) { 8746 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 8747 drawLeft = leftFadeStrength > 0.0f; 8748 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 8749 drawRight = rightFadeStrength > 0.0f; 8750 } 8751 8752 saveCount = canvas.getSaveCount(); 8753 8754 int solidColor = getSolidColor(); 8755 if (solidColor == 0) { 8756 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 8757 8758 if (drawTop) { 8759 canvas.saveLayer(left, top, right, top + length, null, flags); 8760 } 8761 8762 if (drawBottom) { 8763 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 8764 } 8765 8766 if (drawLeft) { 8767 canvas.saveLayer(left, top, left + length, bottom, null, flags); 8768 } 8769 8770 if (drawRight) { 8771 canvas.saveLayer(right - length, top, right, bottom, null, flags); 8772 } 8773 } else { 8774 scrollabilityCache.setFadeColor(solidColor); 8775 } 8776 8777 // Step 3, draw the content 8778 if (!dirtyOpaque) onDraw(canvas); 8779 8780 // Step 4, draw the children 8781 dispatchDraw(canvas); 8782 8783 // Step 5, draw the fade effect and restore layers 8784 final Paint p = scrollabilityCache.paint; 8785 final Matrix matrix = scrollabilityCache.matrix; 8786 final Shader fade = scrollabilityCache.shader; 8787 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 8788 8789 if (drawTop) { 8790 matrix.setScale(1, fadeHeight * topFadeStrength); 8791 matrix.postTranslate(left, top); 8792 fade.setLocalMatrix(matrix); 8793 canvas.drawRect(left, top, right, top + length, p); 8794 } 8795 8796 if (drawBottom) { 8797 matrix.setScale(1, fadeHeight * bottomFadeStrength); 8798 matrix.postRotate(180); 8799 matrix.postTranslate(left, bottom); 8800 fade.setLocalMatrix(matrix); 8801 canvas.drawRect(left, bottom - length, right, bottom, p); 8802 } 8803 8804 if (drawLeft) { 8805 matrix.setScale(1, fadeHeight * leftFadeStrength); 8806 matrix.postRotate(-90); 8807 matrix.postTranslate(left, top); 8808 fade.setLocalMatrix(matrix); 8809 canvas.drawRect(left, top, left + length, bottom, p); 8810 } 8811 8812 if (drawRight) { 8813 matrix.setScale(1, fadeHeight * rightFadeStrength); 8814 matrix.postRotate(90); 8815 matrix.postTranslate(right, top); 8816 fade.setLocalMatrix(matrix); 8817 canvas.drawRect(right - length, top, right, bottom, p); 8818 } 8819 8820 canvas.restoreToCount(saveCount); 8821 8822 // Step 6, draw decorations (scrollbars) 8823 onDrawScrollBars(canvas); 8824 } 8825 8826 /** 8827 * Override this if your view is known to always be drawn on top of a solid color background, 8828 * and needs to draw fading edges. Returning a non-zero color enables the view system to 8829 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 8830 * should be set to 0xFF. 8831 * 8832 * @see #setVerticalFadingEdgeEnabled 8833 * @see #setHorizontalFadingEdgeEnabled 8834 * 8835 * @return The known solid color background for this view, or 0 if the color may vary 8836 */ 8837 public int getSolidColor() { 8838 return 0; 8839 } 8840 8841 /** 8842 * Build a human readable string representation of the specified view flags. 8843 * 8844 * @param flags the view flags to convert to a string 8845 * @return a String representing the supplied flags 8846 */ 8847 private static String printFlags(int flags) { 8848 String output = ""; 8849 int numFlags = 0; 8850 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 8851 output += "TAKES_FOCUS"; 8852 numFlags++; 8853 } 8854 8855 switch (flags & VISIBILITY_MASK) { 8856 case INVISIBLE: 8857 if (numFlags > 0) { 8858 output += " "; 8859 } 8860 output += "INVISIBLE"; 8861 // USELESS HERE numFlags++; 8862 break; 8863 case GONE: 8864 if (numFlags > 0) { 8865 output += " "; 8866 } 8867 output += "GONE"; 8868 // USELESS HERE numFlags++; 8869 break; 8870 default: 8871 break; 8872 } 8873 return output; 8874 } 8875 8876 /** 8877 * Build a human readable string representation of the specified private 8878 * view flags. 8879 * 8880 * @param privateFlags the private view flags to convert to a string 8881 * @return a String representing the supplied flags 8882 */ 8883 private static String printPrivateFlags(int privateFlags) { 8884 String output = ""; 8885 int numFlags = 0; 8886 8887 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 8888 output += "WANTS_FOCUS"; 8889 numFlags++; 8890 } 8891 8892 if ((privateFlags & FOCUSED) == FOCUSED) { 8893 if (numFlags > 0) { 8894 output += " "; 8895 } 8896 output += "FOCUSED"; 8897 numFlags++; 8898 } 8899 8900 if ((privateFlags & SELECTED) == SELECTED) { 8901 if (numFlags > 0) { 8902 output += " "; 8903 } 8904 output += "SELECTED"; 8905 numFlags++; 8906 } 8907 8908 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 8909 if (numFlags > 0) { 8910 output += " "; 8911 } 8912 output += "IS_ROOT_NAMESPACE"; 8913 numFlags++; 8914 } 8915 8916 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 8917 if (numFlags > 0) { 8918 output += " "; 8919 } 8920 output += "HAS_BOUNDS"; 8921 numFlags++; 8922 } 8923 8924 if ((privateFlags & DRAWN) == DRAWN) { 8925 if (numFlags > 0) { 8926 output += " "; 8927 } 8928 output += "DRAWN"; 8929 // USELESS HERE numFlags++; 8930 } 8931 return output; 8932 } 8933 8934 /** 8935 * <p>Indicates whether or not this view's layout will be requested during 8936 * the next hierarchy layout pass.</p> 8937 * 8938 * @return true if the layout will be forced during next layout pass 8939 */ 8940 public boolean isLayoutRequested() { 8941 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 8942 } 8943 8944 /** 8945 * Assign a size and position to a view and all of its 8946 * descendants 8947 * 8948 * <p>This is the second phase of the layout mechanism. 8949 * (The first is measuring). In this phase, each parent calls 8950 * layout on all of its children to position them. 8951 * This is typically done using the child measurements 8952 * that were stored in the measure pass().</p> 8953 * 8954 * <p>Derived classes should not override this method. 8955 * Derived classes with children should override 8956 * onLayout. In that method, they should 8957 * call layout on each of their children.</p> 8958 * 8959 * @param l Left position, relative to parent 8960 * @param t Top position, relative to parent 8961 * @param r Right position, relative to parent 8962 * @param b Bottom position, relative to parent 8963 */ 8964 @SuppressWarnings({"unchecked"}) 8965 public void layout(int l, int t, int r, int b) { 8966 int oldL = mLeft; 8967 int oldT = mTop; 8968 int oldB = mBottom; 8969 int oldR = mRight; 8970 boolean changed = setFrame(l, t, r, b); 8971 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 8972 if (ViewDebug.TRACE_HIERARCHY) { 8973 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 8974 } 8975 8976 onLayout(changed, l, t, r, b); 8977 mPrivateFlags &= ~LAYOUT_REQUIRED; 8978 8979 if (mOnLayoutChangeListeners != null) { 8980 ArrayList<OnLayoutChangeListener> listenersCopy = 8981 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 8982 int numListeners = listenersCopy.size(); 8983 for (int i = 0; i < numListeners; ++i) { 8984 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 8985 } 8986 } 8987 } 8988 mPrivateFlags &= ~FORCE_LAYOUT; 8989 } 8990 8991 /** 8992 * Called from layout when this view should 8993 * assign a size and position to each of its children. 8994 * 8995 * Derived classes with children should override 8996 * this method and call layout on each of 8997 * their children. 8998 * @param changed This is a new size or position for this view 8999 * @param left Left position, relative to parent 9000 * @param top Top position, relative to parent 9001 * @param right Right position, relative to parent 9002 * @param bottom Bottom position, relative to parent 9003 */ 9004 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 9005 } 9006 9007 /** 9008 * Assign a size and position to this view. 9009 * 9010 * This is called from layout. 9011 * 9012 * @param left Left position, relative to parent 9013 * @param top Top position, relative to parent 9014 * @param right Right position, relative to parent 9015 * @param bottom Bottom position, relative to parent 9016 * @return true if the new size and position are different than the 9017 * previous ones 9018 * {@hide} 9019 */ 9020 protected boolean setFrame(int left, int top, int right, int bottom) { 9021 boolean changed = false; 9022 9023 if (DBG) { 9024 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 9025 + right + "," + bottom + ")"); 9026 } 9027 9028 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 9029 changed = true; 9030 9031 // Remember our drawn bit 9032 int drawn = mPrivateFlags & DRAWN; 9033 9034 // Invalidate our old position 9035 invalidate(); 9036 9037 9038 int oldWidth = mRight - mLeft; 9039 int oldHeight = mBottom - mTop; 9040 9041 mLeft = left; 9042 mTop = top; 9043 mRight = right; 9044 mBottom = bottom; 9045 9046 mPrivateFlags |= HAS_BOUNDS; 9047 9048 int newWidth = right - left; 9049 int newHeight = bottom - top; 9050 9051 if (newWidth != oldWidth || newHeight != oldHeight) { 9052 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9053 // A change in dimension means an auto-centered pivot point changes, too 9054 mMatrixDirty = true; 9055 } 9056 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 9057 } 9058 9059 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 9060 // If we are visible, force the DRAWN bit to on so that 9061 // this invalidate will go through (at least to our parent). 9062 // This is because someone may have invalidated this view 9063 // before this call to setFrame came in, thereby clearing 9064 // the DRAWN bit. 9065 mPrivateFlags |= DRAWN; 9066 invalidate(); 9067 } 9068 9069 // Reset drawn bit to original value (invalidate turns it off) 9070 mPrivateFlags |= drawn; 9071 9072 mBackgroundSizeChanged = true; 9073 } 9074 return changed; 9075 } 9076 9077 /** 9078 * Finalize inflating a view from XML. This is called as the last phase 9079 * of inflation, after all child views have been added. 9080 * 9081 * <p>Even if the subclass overrides onFinishInflate, they should always be 9082 * sure to call the super method, so that we get called. 9083 */ 9084 protected void onFinishInflate() { 9085 } 9086 9087 /** 9088 * Returns the resources associated with this view. 9089 * 9090 * @return Resources object. 9091 */ 9092 public Resources getResources() { 9093 return mResources; 9094 } 9095 9096 /** 9097 * Invalidates the specified Drawable. 9098 * 9099 * @param drawable the drawable to invalidate 9100 */ 9101 public void invalidateDrawable(Drawable drawable) { 9102 if (verifyDrawable(drawable)) { 9103 final Rect dirty = drawable.getBounds(); 9104 final int scrollX = mScrollX; 9105 final int scrollY = mScrollY; 9106 9107 invalidate(dirty.left + scrollX, dirty.top + scrollY, 9108 dirty.right + scrollX, dirty.bottom + scrollY); 9109 } 9110 } 9111 9112 /** 9113 * Schedules an action on a drawable to occur at a specified time. 9114 * 9115 * @param who the recipient of the action 9116 * @param what the action to run on the drawable 9117 * @param when the time at which the action must occur. Uses the 9118 * {@link SystemClock#uptimeMillis} timebase. 9119 */ 9120 public void scheduleDrawable(Drawable who, Runnable what, long when) { 9121 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9122 mAttachInfo.mHandler.postAtTime(what, who, when); 9123 } 9124 } 9125 9126 /** 9127 * Cancels a scheduled action on a drawable. 9128 * 9129 * @param who the recipient of the action 9130 * @param what the action to cancel 9131 */ 9132 public void unscheduleDrawable(Drawable who, Runnable what) { 9133 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9134 mAttachInfo.mHandler.removeCallbacks(what, who); 9135 } 9136 } 9137 9138 /** 9139 * Unschedule any events associated with the given Drawable. This can be 9140 * used when selecting a new Drawable into a view, so that the previous 9141 * one is completely unscheduled. 9142 * 9143 * @param who The Drawable to unschedule. 9144 * 9145 * @see #drawableStateChanged 9146 */ 9147 public void unscheduleDrawable(Drawable who) { 9148 if (mAttachInfo != null) { 9149 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 9150 } 9151 } 9152 9153 /** 9154 * If your view subclass is displaying its own Drawable objects, it should 9155 * override this function and return true for any Drawable it is 9156 * displaying. This allows animations for those drawables to be 9157 * scheduled. 9158 * 9159 * <p>Be sure to call through to the super class when overriding this 9160 * function. 9161 * 9162 * @param who The Drawable to verify. Return true if it is one you are 9163 * displaying, else return the result of calling through to the 9164 * super class. 9165 * 9166 * @return boolean If true than the Drawable is being displayed in the 9167 * view; else false and it is not allowed to animate. 9168 * 9169 * @see #unscheduleDrawable 9170 * @see #drawableStateChanged 9171 */ 9172 protected boolean verifyDrawable(Drawable who) { 9173 return who == mBGDrawable; 9174 } 9175 9176 /** 9177 * This function is called whenever the state of the view changes in such 9178 * a way that it impacts the state of drawables being shown. 9179 * 9180 * <p>Be sure to call through to the superclass when overriding this 9181 * function. 9182 * 9183 * @see Drawable#setState 9184 */ 9185 protected void drawableStateChanged() { 9186 Drawable d = mBGDrawable; 9187 if (d != null && d.isStateful()) { 9188 d.setState(getDrawableState()); 9189 } 9190 } 9191 9192 /** 9193 * Call this to force a view to update its drawable state. This will cause 9194 * drawableStateChanged to be called on this view. Views that are interested 9195 * in the new state should call getDrawableState. 9196 * 9197 * @see #drawableStateChanged 9198 * @see #getDrawableState 9199 */ 9200 public void refreshDrawableState() { 9201 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9202 drawableStateChanged(); 9203 9204 ViewParent parent = mParent; 9205 if (parent != null) { 9206 parent.childDrawableStateChanged(this); 9207 } 9208 } 9209 9210 /** 9211 * Return an array of resource IDs of the drawable states representing the 9212 * current state of the view. 9213 * 9214 * @return The current drawable state 9215 * 9216 * @see Drawable#setState 9217 * @see #drawableStateChanged 9218 * @see #onCreateDrawableState 9219 */ 9220 public final int[] getDrawableState() { 9221 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 9222 return mDrawableState; 9223 } else { 9224 mDrawableState = onCreateDrawableState(0); 9225 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 9226 return mDrawableState; 9227 } 9228 } 9229 9230 /** 9231 * Generate the new {@link android.graphics.drawable.Drawable} state for 9232 * this view. This is called by the view 9233 * system when the cached Drawable state is determined to be invalid. To 9234 * retrieve the current state, you should use {@link #getDrawableState}. 9235 * 9236 * @param extraSpace if non-zero, this is the number of extra entries you 9237 * would like in the returned array in which you can place your own 9238 * states. 9239 * 9240 * @return Returns an array holding the current {@link Drawable} state of 9241 * the view. 9242 * 9243 * @see #mergeDrawableStates 9244 */ 9245 protected int[] onCreateDrawableState(int extraSpace) { 9246 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 9247 mParent instanceof View) { 9248 return ((View) mParent).onCreateDrawableState(extraSpace); 9249 } 9250 9251 int[] drawableState; 9252 9253 int privateFlags = mPrivateFlags; 9254 9255 int viewStateIndex = 0; 9256 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 9257 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 9258 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 9259 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 9260 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 9261 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 9262 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested) { 9263 // This is set if HW acceleration is requested, even if the current 9264 // process doesn't allow it. This is just to allow app preview 9265 // windows to better match their app. 9266 viewStateIndex |= VIEW_STATE_ACCELERATED; 9267 } 9268 9269 drawableState = VIEW_STATE_SETS[viewStateIndex]; 9270 9271 //noinspection ConstantIfStatement 9272 if (false) { 9273 Log.i("View", "drawableStateIndex=" + viewStateIndex); 9274 Log.i("View", toString() 9275 + " pressed=" + ((privateFlags & PRESSED) != 0) 9276 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 9277 + " fo=" + hasFocus() 9278 + " sl=" + ((privateFlags & SELECTED) != 0) 9279 + " wf=" + hasWindowFocus() 9280 + ": " + Arrays.toString(drawableState)); 9281 } 9282 9283 if (extraSpace == 0) { 9284 return drawableState; 9285 } 9286 9287 final int[] fullState; 9288 if (drawableState != null) { 9289 fullState = new int[drawableState.length + extraSpace]; 9290 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 9291 } else { 9292 fullState = new int[extraSpace]; 9293 } 9294 9295 return fullState; 9296 } 9297 9298 /** 9299 * Merge your own state values in <var>additionalState</var> into the base 9300 * state values <var>baseState</var> that were returned by 9301 * {@link #onCreateDrawableState}. 9302 * 9303 * @param baseState The base state values returned by 9304 * {@link #onCreateDrawableState}, which will be modified to also hold your 9305 * own additional state values. 9306 * 9307 * @param additionalState The additional state values you would like 9308 * added to <var>baseState</var>; this array is not modified. 9309 * 9310 * @return As a convenience, the <var>baseState</var> array you originally 9311 * passed into the function is returned. 9312 * 9313 * @see #onCreateDrawableState 9314 */ 9315 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 9316 final int N = baseState.length; 9317 int i = N - 1; 9318 while (i >= 0 && baseState[i] == 0) { 9319 i--; 9320 } 9321 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 9322 return baseState; 9323 } 9324 9325 /** 9326 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 9327 * on all Drawable objects associated with this view. 9328 */ 9329 public void jumpDrawablesToCurrentState() { 9330 if (mBGDrawable != null) { 9331 mBGDrawable.jumpToCurrentState(); 9332 } 9333 } 9334 9335 /** 9336 * Sets the background color for this view. 9337 * @param color the color of the background 9338 */ 9339 @RemotableViewMethod 9340 public void setBackgroundColor(int color) { 9341 if (mBGDrawable instanceof ColorDrawable) { 9342 ((ColorDrawable) mBGDrawable).setColor(color); 9343 } else { 9344 setBackgroundDrawable(new ColorDrawable(color)); 9345 } 9346 } 9347 9348 /** 9349 * Set the background to a given resource. The resource should refer to 9350 * a Drawable object or 0 to remove the background. 9351 * @param resid The identifier of the resource. 9352 * @attr ref android.R.styleable#View_background 9353 */ 9354 @RemotableViewMethod 9355 public void setBackgroundResource(int resid) { 9356 if (resid != 0 && resid == mBackgroundResource) { 9357 return; 9358 } 9359 9360 Drawable d= null; 9361 if (resid != 0) { 9362 d = mResources.getDrawable(resid); 9363 } 9364 setBackgroundDrawable(d); 9365 9366 mBackgroundResource = resid; 9367 } 9368 9369 /** 9370 * Set the background to a given Drawable, or remove the background. If the 9371 * background has padding, this View's padding is set to the background's 9372 * padding. However, when a background is removed, this View's padding isn't 9373 * touched. If setting the padding is desired, please use 9374 * {@link #setPadding(int, int, int, int)}. 9375 * 9376 * @param d The Drawable to use as the background, or null to remove the 9377 * background 9378 */ 9379 public void setBackgroundDrawable(Drawable d) { 9380 boolean requestLayout = false; 9381 9382 mBackgroundResource = 0; 9383 9384 /* 9385 * Regardless of whether we're setting a new background or not, we want 9386 * to clear the previous drawable. 9387 */ 9388 if (mBGDrawable != null) { 9389 mBGDrawable.setCallback(null); 9390 unscheduleDrawable(mBGDrawable); 9391 } 9392 9393 if (d != null) { 9394 Rect padding = sThreadLocal.get(); 9395 if (padding == null) { 9396 padding = new Rect(); 9397 sThreadLocal.set(padding); 9398 } 9399 if (d.getPadding(padding)) { 9400 setPadding(padding.left, padding.top, padding.right, padding.bottom); 9401 } 9402 9403 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 9404 // if it has a different minimum size, we should layout again 9405 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 9406 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 9407 requestLayout = true; 9408 } 9409 9410 d.setCallback(this); 9411 if (d.isStateful()) { 9412 d.setState(getDrawableState()); 9413 } 9414 d.setVisible(getVisibility() == VISIBLE, false); 9415 mBGDrawable = d; 9416 9417 if ((mPrivateFlags & SKIP_DRAW) != 0) { 9418 mPrivateFlags &= ~SKIP_DRAW; 9419 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 9420 requestLayout = true; 9421 } 9422 } else { 9423 /* Remove the background */ 9424 mBGDrawable = null; 9425 9426 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 9427 /* 9428 * This view ONLY drew the background before and we're removing 9429 * the background, so now it won't draw anything 9430 * (hence we SKIP_DRAW) 9431 */ 9432 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 9433 mPrivateFlags |= SKIP_DRAW; 9434 } 9435 9436 /* 9437 * When the background is set, we try to apply its padding to this 9438 * View. When the background is removed, we don't touch this View's 9439 * padding. This is noted in the Javadocs. Hence, we don't need to 9440 * requestLayout(), the invalidate() below is sufficient. 9441 */ 9442 9443 // The old background's minimum size could have affected this 9444 // View's layout, so let's requestLayout 9445 requestLayout = true; 9446 } 9447 9448 computeOpaqueFlags(); 9449 9450 if (requestLayout) { 9451 requestLayout(); 9452 } 9453 9454 mBackgroundSizeChanged = true; 9455 invalidate(); 9456 } 9457 9458 /** 9459 * Gets the background drawable 9460 * @return The drawable used as the background for this view, if any. 9461 */ 9462 public Drawable getBackground() { 9463 return mBGDrawable; 9464 } 9465 9466 /** 9467 * Sets the padding. The view may add on the space required to display 9468 * the scrollbars, depending on the style and visibility of the scrollbars. 9469 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 9470 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 9471 * from the values set in this call. 9472 * 9473 * @attr ref android.R.styleable#View_padding 9474 * @attr ref android.R.styleable#View_paddingBottom 9475 * @attr ref android.R.styleable#View_paddingLeft 9476 * @attr ref android.R.styleable#View_paddingRight 9477 * @attr ref android.R.styleable#View_paddingTop 9478 * @param left the left padding in pixels 9479 * @param top the top padding in pixels 9480 * @param right the right padding in pixels 9481 * @param bottom the bottom padding in pixels 9482 */ 9483 public void setPadding(int left, int top, int right, int bottom) { 9484 boolean changed = false; 9485 9486 mUserPaddingLeft = left; 9487 mUserPaddingRight = right; 9488 mUserPaddingBottom = bottom; 9489 9490 final int viewFlags = mViewFlags; 9491 9492 // Common case is there are no scroll bars. 9493 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 9494 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 9495 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 9496 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 9497 ? 0 : getVerticalScrollbarWidth(); 9498 switch (mVerticalScrollbarPosition) { 9499 case SCROLLBAR_POSITION_DEFAULT: 9500 case SCROLLBAR_POSITION_RIGHT: 9501 right += offset; 9502 break; 9503 case SCROLLBAR_POSITION_LEFT: 9504 left += offset; 9505 break; 9506 } 9507 } 9508 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 9509 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 9510 ? 0 : getHorizontalScrollbarHeight(); 9511 } 9512 } 9513 9514 if (mPaddingLeft != left) { 9515 changed = true; 9516 mPaddingLeft = left; 9517 } 9518 if (mPaddingTop != top) { 9519 changed = true; 9520 mPaddingTop = top; 9521 } 9522 if (mPaddingRight != right) { 9523 changed = true; 9524 mPaddingRight = right; 9525 } 9526 if (mPaddingBottom != bottom) { 9527 changed = true; 9528 mPaddingBottom = bottom; 9529 } 9530 9531 if (changed) { 9532 requestLayout(); 9533 } 9534 } 9535 9536 /** 9537 * Returns the top padding of this view. 9538 * 9539 * @return the top padding in pixels 9540 */ 9541 public int getPaddingTop() { 9542 return mPaddingTop; 9543 } 9544 9545 /** 9546 * Returns the bottom padding of this view. If there are inset and enabled 9547 * scrollbars, this value may include the space required to display the 9548 * scrollbars as well. 9549 * 9550 * @return the bottom padding in pixels 9551 */ 9552 public int getPaddingBottom() { 9553 return mPaddingBottom; 9554 } 9555 9556 /** 9557 * Returns the left padding of this view. If there are inset and enabled 9558 * scrollbars, this value may include the space required to display the 9559 * scrollbars as well. 9560 * 9561 * @return the left padding in pixels 9562 */ 9563 public int getPaddingLeft() { 9564 return mPaddingLeft; 9565 } 9566 9567 /** 9568 * Returns the right padding of this view. If there are inset and enabled 9569 * scrollbars, this value may include the space required to display the 9570 * scrollbars as well. 9571 * 9572 * @return the right padding in pixels 9573 */ 9574 public int getPaddingRight() { 9575 return mPaddingRight; 9576 } 9577 9578 /** 9579 * Changes the selection state of this view. A view can be selected or not. 9580 * Note that selection is not the same as focus. Views are typically 9581 * selected in the context of an AdapterView like ListView or GridView; 9582 * the selected view is the view that is highlighted. 9583 * 9584 * @param selected true if the view must be selected, false otherwise 9585 */ 9586 public void setSelected(boolean selected) { 9587 if (((mPrivateFlags & SELECTED) != 0) != selected) { 9588 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 9589 if (!selected) resetPressedState(); 9590 invalidate(); 9591 refreshDrawableState(); 9592 dispatchSetSelected(selected); 9593 } 9594 } 9595 9596 /** 9597 * Dispatch setSelected to all of this View's children. 9598 * 9599 * @see #setSelected(boolean) 9600 * 9601 * @param selected The new selected state 9602 */ 9603 protected void dispatchSetSelected(boolean selected) { 9604 } 9605 9606 /** 9607 * Indicates the selection state of this view. 9608 * 9609 * @return true if the view is selected, false otherwise 9610 */ 9611 @ViewDebug.ExportedProperty 9612 public boolean isSelected() { 9613 return (mPrivateFlags & SELECTED) != 0; 9614 } 9615 9616 /** 9617 * Changes the activated state of this view. A view can be activated or not. 9618 * Note that activation is not the same as selection. Selection is 9619 * a transient property, representing the view (hierarchy) the user is 9620 * currently interacting with. Activation is a longer-term state that the 9621 * user can move views in and out of. For example, in a list view with 9622 * single or multiple selection enabled, the views in the current selection 9623 * set are activated. (Um, yeah, we are deeply sorry about the terminology 9624 * here.) The activated state is propagated down to children of the view it 9625 * is set on. 9626 * 9627 * @param activated true if the view must be activated, false otherwise 9628 */ 9629 public void setActivated(boolean activated) { 9630 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 9631 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 9632 invalidate(); 9633 refreshDrawableState(); 9634 dispatchSetActivated(activated); 9635 } 9636 } 9637 9638 /** 9639 * Dispatch setActivated to all of this View's children. 9640 * 9641 * @see #setActivated(boolean) 9642 * 9643 * @param activated The new activated state 9644 */ 9645 protected void dispatchSetActivated(boolean activated) { 9646 } 9647 9648 /** 9649 * Indicates the activation state of this view. 9650 * 9651 * @return true if the view is activated, false otherwise 9652 */ 9653 @ViewDebug.ExportedProperty 9654 public boolean isActivated() { 9655 return (mPrivateFlags & ACTIVATED) != 0; 9656 } 9657 9658 /** 9659 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 9660 * observer can be used to get notifications when global events, like 9661 * layout, happen. 9662 * 9663 * The returned ViewTreeObserver observer is not guaranteed to remain 9664 * valid for the lifetime of this View. If the caller of this method keeps 9665 * a long-lived reference to ViewTreeObserver, it should always check for 9666 * the return value of {@link ViewTreeObserver#isAlive()}. 9667 * 9668 * @return The ViewTreeObserver for this view's hierarchy. 9669 */ 9670 public ViewTreeObserver getViewTreeObserver() { 9671 if (mAttachInfo != null) { 9672 return mAttachInfo.mTreeObserver; 9673 } 9674 if (mFloatingTreeObserver == null) { 9675 mFloatingTreeObserver = new ViewTreeObserver(); 9676 } 9677 return mFloatingTreeObserver; 9678 } 9679 9680 /** 9681 * <p>Finds the topmost view in the current view hierarchy.</p> 9682 * 9683 * @return the topmost view containing this view 9684 */ 9685 public View getRootView() { 9686 if (mAttachInfo != null) { 9687 final View v = mAttachInfo.mRootView; 9688 if (v != null) { 9689 return v; 9690 } 9691 } 9692 9693 View parent = this; 9694 9695 while (parent.mParent != null && parent.mParent instanceof View) { 9696 parent = (View) parent.mParent; 9697 } 9698 9699 return parent; 9700 } 9701 9702 /** 9703 * <p>Computes the coordinates of this view on the screen. The argument 9704 * must be an array of two integers. After the method returns, the array 9705 * contains the x and y location in that order.</p> 9706 * 9707 * @param location an array of two integers in which to hold the coordinates 9708 */ 9709 public void getLocationOnScreen(int[] location) { 9710 getLocationInWindow(location); 9711 9712 final AttachInfo info = mAttachInfo; 9713 if (info != null) { 9714 location[0] += info.mWindowLeft; 9715 location[1] += info.mWindowTop; 9716 } 9717 } 9718 9719 /** 9720 * <p>Computes the coordinates of this view in its window. The argument 9721 * must be an array of two integers. After the method returns, the array 9722 * contains the x and y location in that order.</p> 9723 * 9724 * @param location an array of two integers in which to hold the coordinates 9725 */ 9726 public void getLocationInWindow(int[] location) { 9727 if (location == null || location.length < 2) { 9728 throw new IllegalArgumentException("location must be an array of " 9729 + "two integers"); 9730 } 9731 9732 location[0] = mLeft + (int) (mTranslationX + 0.5f); 9733 location[1] = mTop + (int) (mTranslationY + 0.5f); 9734 9735 ViewParent viewParent = mParent; 9736 while (viewParent instanceof View) { 9737 final View view = (View)viewParent; 9738 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 9739 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 9740 viewParent = view.mParent; 9741 } 9742 9743 if (viewParent instanceof ViewRoot) { 9744 // *cough* 9745 final ViewRoot vr = (ViewRoot)viewParent; 9746 location[1] -= vr.mCurScrollY; 9747 } 9748 } 9749 9750 /** 9751 * {@hide} 9752 * @param id the id of the view to be found 9753 * @return the view of the specified id, null if cannot be found 9754 */ 9755 protected View findViewTraversal(int id) { 9756 if (id == mID) { 9757 return this; 9758 } 9759 return null; 9760 } 9761 9762 /** 9763 * {@hide} 9764 * @param tag the tag of the view to be found 9765 * @return the view of specified tag, null if cannot be found 9766 */ 9767 protected View findViewWithTagTraversal(Object tag) { 9768 if (tag != null && tag.equals(mTag)) { 9769 return this; 9770 } 9771 return null; 9772 } 9773 9774 /** 9775 * {@hide} 9776 * @param predicate The predicate to evaluate. 9777 * @return The first view that matches the predicate or null. 9778 */ 9779 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 9780 if (predicate.apply(this)) { 9781 return this; 9782 } 9783 return null; 9784 } 9785 9786 /** 9787 * Look for a child view with the given id. If this view has the given 9788 * id, return this view. 9789 * 9790 * @param id The id to search for. 9791 * @return The view that has the given id in the hierarchy or null 9792 */ 9793 public final View findViewById(int id) { 9794 if (id < 0) { 9795 return null; 9796 } 9797 return findViewTraversal(id); 9798 } 9799 9800 /** 9801 * Look for a child view with the given tag. If this view has the given 9802 * tag, return this view. 9803 * 9804 * @param tag The tag to search for, using "tag.equals(getTag())". 9805 * @return The View that has the given tag in the hierarchy or null 9806 */ 9807 public final View findViewWithTag(Object tag) { 9808 if (tag == null) { 9809 return null; 9810 } 9811 return findViewWithTagTraversal(tag); 9812 } 9813 9814 /** 9815 * {@hide} 9816 * Look for a child view that matches the specified predicate. 9817 * If this view matches the predicate, return this view. 9818 * 9819 * @param predicate The predicate to evaluate. 9820 * @return The first view that matches the predicate or null. 9821 */ 9822 public final View findViewByPredicate(Predicate<View> predicate) { 9823 return findViewByPredicateTraversal(predicate); 9824 } 9825 9826 /** 9827 * Sets the identifier for this view. The identifier does not have to be 9828 * unique in this view's hierarchy. The identifier should be a positive 9829 * number. 9830 * 9831 * @see #NO_ID 9832 * @see #getId 9833 * @see #findViewById 9834 * 9835 * @param id a number used to identify the view 9836 * 9837 * @attr ref android.R.styleable#View_id 9838 */ 9839 public void setId(int id) { 9840 mID = id; 9841 } 9842 9843 /** 9844 * {@hide} 9845 * 9846 * @param isRoot true if the view belongs to the root namespace, false 9847 * otherwise 9848 */ 9849 public void setIsRootNamespace(boolean isRoot) { 9850 if (isRoot) { 9851 mPrivateFlags |= IS_ROOT_NAMESPACE; 9852 } else { 9853 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 9854 } 9855 } 9856 9857 /** 9858 * {@hide} 9859 * 9860 * @return true if the view belongs to the root namespace, false otherwise 9861 */ 9862 public boolean isRootNamespace() { 9863 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 9864 } 9865 9866 /** 9867 * Returns this view's identifier. 9868 * 9869 * @return a positive integer used to identify the view or {@link #NO_ID} 9870 * if the view has no ID 9871 * 9872 * @see #setId 9873 * @see #findViewById 9874 * @attr ref android.R.styleable#View_id 9875 */ 9876 @ViewDebug.CapturedViewProperty 9877 public int getId() { 9878 return mID; 9879 } 9880 9881 /** 9882 * Returns this view's tag. 9883 * 9884 * @return the Object stored in this view as a tag 9885 * 9886 * @see #setTag(Object) 9887 * @see #getTag(int) 9888 */ 9889 @ViewDebug.ExportedProperty 9890 public Object getTag() { 9891 return mTag; 9892 } 9893 9894 /** 9895 * Sets the tag associated with this view. A tag can be used to mark 9896 * a view in its hierarchy and does not have to be unique within the 9897 * hierarchy. Tags can also be used to store data within a view without 9898 * resorting to another data structure. 9899 * 9900 * @param tag an Object to tag the view with 9901 * 9902 * @see #getTag() 9903 * @see #setTag(int, Object) 9904 */ 9905 public void setTag(final Object tag) { 9906 mTag = tag; 9907 } 9908 9909 /** 9910 * Returns the tag associated with this view and the specified key. 9911 * 9912 * @param key The key identifying the tag 9913 * 9914 * @return the Object stored in this view as a tag 9915 * 9916 * @see #setTag(int, Object) 9917 * @see #getTag() 9918 */ 9919 public Object getTag(int key) { 9920 SparseArray<Object> tags = null; 9921 synchronized (sTagsLock) { 9922 if (sTags != null) { 9923 tags = sTags.get(this); 9924 } 9925 } 9926 9927 if (tags != null) return tags.get(key); 9928 return null; 9929 } 9930 9931 /** 9932 * Sets a tag associated with this view and a key. A tag can be used 9933 * to mark a view in its hierarchy and does not have to be unique within 9934 * the hierarchy. Tags can also be used to store data within a view 9935 * without resorting to another data structure. 9936 * 9937 * The specified key should be an id declared in the resources of the 9938 * application to ensure it is unique (see the <a 9939 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 9940 * Keys identified as belonging to 9941 * the Android framework or not associated with any package will cause 9942 * an {@link IllegalArgumentException} to be thrown. 9943 * 9944 * @param key The key identifying the tag 9945 * @param tag An Object to tag the view with 9946 * 9947 * @throws IllegalArgumentException If they specified key is not valid 9948 * 9949 * @see #setTag(Object) 9950 * @see #getTag(int) 9951 */ 9952 public void setTag(int key, final Object tag) { 9953 // If the package id is 0x00 or 0x01, it's either an undefined package 9954 // or a framework id 9955 if ((key >>> 24) < 2) { 9956 throw new IllegalArgumentException("The key must be an application-specific " 9957 + "resource id."); 9958 } 9959 9960 setTagInternal(this, key, tag); 9961 } 9962 9963 /** 9964 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 9965 * framework id. 9966 * 9967 * @hide 9968 */ 9969 public void setTagInternal(int key, Object tag) { 9970 if ((key >>> 24) != 0x1) { 9971 throw new IllegalArgumentException("The key must be a framework-specific " 9972 + "resource id."); 9973 } 9974 9975 setTagInternal(this, key, tag); 9976 } 9977 9978 private static void setTagInternal(View view, int key, Object tag) { 9979 SparseArray<Object> tags = null; 9980 synchronized (sTagsLock) { 9981 if (sTags == null) { 9982 sTags = new WeakHashMap<View, SparseArray<Object>>(); 9983 } else { 9984 tags = sTags.get(view); 9985 } 9986 } 9987 9988 if (tags == null) { 9989 tags = new SparseArray<Object>(2); 9990 synchronized (sTagsLock) { 9991 sTags.put(view, tags); 9992 } 9993 } 9994 9995 tags.put(key, tag); 9996 } 9997 9998 /** 9999 * @param consistency The type of consistency. See ViewDebug for more information. 10000 * 10001 * @hide 10002 */ 10003 protected boolean dispatchConsistencyCheck(int consistency) { 10004 return onConsistencyCheck(consistency); 10005 } 10006 10007 /** 10008 * Method that subclasses should implement to check their consistency. The type of 10009 * consistency check is indicated by the bit field passed as a parameter. 10010 * 10011 * @param consistency The type of consistency. See ViewDebug for more information. 10012 * 10013 * @throws IllegalStateException if the view is in an inconsistent state. 10014 * 10015 * @hide 10016 */ 10017 protected boolean onConsistencyCheck(int consistency) { 10018 boolean result = true; 10019 10020 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 10021 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 10022 10023 if (checkLayout) { 10024 if (getParent() == null) { 10025 result = false; 10026 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10027 "View " + this + " does not have a parent."); 10028 } 10029 10030 if (mAttachInfo == null) { 10031 result = false; 10032 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10033 "View " + this + " is not attached to a window."); 10034 } 10035 } 10036 10037 if (checkDrawing) { 10038 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 10039 // from their draw() method 10040 10041 if ((mPrivateFlags & DRAWN) != DRAWN && 10042 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 10043 result = false; 10044 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10045 "View " + this + " was invalidated but its drawing cache is valid."); 10046 } 10047 } 10048 10049 return result; 10050 } 10051 10052 /** 10053 * Prints information about this view in the log output, with the tag 10054 * {@link #VIEW_LOG_TAG}. 10055 * 10056 * @hide 10057 */ 10058 public void debug() { 10059 debug(0); 10060 } 10061 10062 /** 10063 * Prints information about this view in the log output, with the tag 10064 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 10065 * indentation defined by the <code>depth</code>. 10066 * 10067 * @param depth the indentation level 10068 * 10069 * @hide 10070 */ 10071 protected void debug(int depth) { 10072 String output = debugIndent(depth - 1); 10073 10074 output += "+ " + this; 10075 int id = getId(); 10076 if (id != -1) { 10077 output += " (id=" + id + ")"; 10078 } 10079 Object tag = getTag(); 10080 if (tag != null) { 10081 output += " (tag=" + tag + ")"; 10082 } 10083 Log.d(VIEW_LOG_TAG, output); 10084 10085 if ((mPrivateFlags & FOCUSED) != 0) { 10086 output = debugIndent(depth) + " FOCUSED"; 10087 Log.d(VIEW_LOG_TAG, output); 10088 } 10089 10090 output = debugIndent(depth); 10091 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 10092 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 10093 + "} "; 10094 Log.d(VIEW_LOG_TAG, output); 10095 10096 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 10097 || mPaddingBottom != 0) { 10098 output = debugIndent(depth); 10099 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 10100 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 10101 Log.d(VIEW_LOG_TAG, output); 10102 } 10103 10104 output = debugIndent(depth); 10105 output += "mMeasureWidth=" + mMeasuredWidth + 10106 " mMeasureHeight=" + mMeasuredHeight; 10107 Log.d(VIEW_LOG_TAG, output); 10108 10109 output = debugIndent(depth); 10110 if (mLayoutParams == null) { 10111 output += "BAD! no layout params"; 10112 } else { 10113 output = mLayoutParams.debug(output); 10114 } 10115 Log.d(VIEW_LOG_TAG, output); 10116 10117 output = debugIndent(depth); 10118 output += "flags={"; 10119 output += View.printFlags(mViewFlags); 10120 output += "}"; 10121 Log.d(VIEW_LOG_TAG, output); 10122 10123 output = debugIndent(depth); 10124 output += "privateFlags={"; 10125 output += View.printPrivateFlags(mPrivateFlags); 10126 output += "}"; 10127 Log.d(VIEW_LOG_TAG, output); 10128 } 10129 10130 /** 10131 * Creates an string of whitespaces used for indentation. 10132 * 10133 * @param depth the indentation level 10134 * @return a String containing (depth * 2 + 3) * 2 white spaces 10135 * 10136 * @hide 10137 */ 10138 protected static String debugIndent(int depth) { 10139 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 10140 for (int i = 0; i < (depth * 2) + 3; i++) { 10141 spaces.append(' ').append(' '); 10142 } 10143 return spaces.toString(); 10144 } 10145 10146 /** 10147 * <p>Return the offset of the widget's text baseline from the widget's top 10148 * boundary. If this widget does not support baseline alignment, this 10149 * method returns -1. </p> 10150 * 10151 * @return the offset of the baseline within the widget's bounds or -1 10152 * if baseline alignment is not supported 10153 */ 10154 @ViewDebug.ExportedProperty(category = "layout") 10155 public int getBaseline() { 10156 return -1; 10157 } 10158 10159 /** 10160 * Call this when something has changed which has invalidated the 10161 * layout of this view. This will schedule a layout pass of the view 10162 * tree. 10163 */ 10164 public void requestLayout() { 10165 if (ViewDebug.TRACE_HIERARCHY) { 10166 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 10167 } 10168 10169 mPrivateFlags |= FORCE_LAYOUT; 10170 10171 if (mParent != null && !mParent.isLayoutRequested()) { 10172 mParent.requestLayout(); 10173 } 10174 } 10175 10176 /** 10177 * Forces this view to be laid out during the next layout pass. 10178 * This method does not call requestLayout() or forceLayout() 10179 * on the parent. 10180 */ 10181 public void forceLayout() { 10182 mPrivateFlags |= FORCE_LAYOUT; 10183 } 10184 10185 /** 10186 * <p> 10187 * This is called to find out how big a view should be. The parent 10188 * supplies constraint information in the width and height parameters. 10189 * </p> 10190 * 10191 * <p> 10192 * The actual mesurement work of a view is performed in 10193 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 10194 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 10195 * </p> 10196 * 10197 * 10198 * @param widthMeasureSpec Horizontal space requirements as imposed by the 10199 * parent 10200 * @param heightMeasureSpec Vertical space requirements as imposed by the 10201 * parent 10202 * 10203 * @see #onMeasure(int, int) 10204 */ 10205 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 10206 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 10207 widthMeasureSpec != mOldWidthMeasureSpec || 10208 heightMeasureSpec != mOldHeightMeasureSpec) { 10209 10210 // first clears the measured dimension flag 10211 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 10212 10213 if (ViewDebug.TRACE_HIERARCHY) { 10214 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 10215 } 10216 10217 // measure ourselves, this should set the measured dimension flag back 10218 onMeasure(widthMeasureSpec, heightMeasureSpec); 10219 10220 // flag not set, setMeasuredDimension() was not invoked, we raise 10221 // an exception to warn the developer 10222 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 10223 throw new IllegalStateException("onMeasure() did not set the" 10224 + " measured dimension by calling" 10225 + " setMeasuredDimension()"); 10226 } 10227 10228 mPrivateFlags |= LAYOUT_REQUIRED; 10229 } 10230 10231 mOldWidthMeasureSpec = widthMeasureSpec; 10232 mOldHeightMeasureSpec = heightMeasureSpec; 10233 } 10234 10235 /** 10236 * <p> 10237 * Measure the view and its content to determine the measured width and the 10238 * measured height. This method is invoked by {@link #measure(int, int)} and 10239 * should be overriden by subclasses to provide accurate and efficient 10240 * measurement of their contents. 10241 * </p> 10242 * 10243 * <p> 10244 * <strong>CONTRACT:</strong> When overriding this method, you 10245 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 10246 * measured width and height of this view. Failure to do so will trigger an 10247 * <code>IllegalStateException</code>, thrown by 10248 * {@link #measure(int, int)}. Calling the superclass' 10249 * {@link #onMeasure(int, int)} is a valid use. 10250 * </p> 10251 * 10252 * <p> 10253 * The base class implementation of measure defaults to the background size, 10254 * unless a larger size is allowed by the MeasureSpec. Subclasses should 10255 * override {@link #onMeasure(int, int)} to provide better measurements of 10256 * their content. 10257 * </p> 10258 * 10259 * <p> 10260 * If this method is overridden, it is the subclass's responsibility to make 10261 * sure the measured height and width are at least the view's minimum height 10262 * and width ({@link #getSuggestedMinimumHeight()} and 10263 * {@link #getSuggestedMinimumWidth()}). 10264 * </p> 10265 * 10266 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 10267 * The requirements are encoded with 10268 * {@link android.view.View.MeasureSpec}. 10269 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 10270 * The requirements are encoded with 10271 * {@link android.view.View.MeasureSpec}. 10272 * 10273 * @see #getMeasuredWidth() 10274 * @see #getMeasuredHeight() 10275 * @see #setMeasuredDimension(int, int) 10276 * @see #getSuggestedMinimumHeight() 10277 * @see #getSuggestedMinimumWidth() 10278 * @see android.view.View.MeasureSpec#getMode(int) 10279 * @see android.view.View.MeasureSpec#getSize(int) 10280 */ 10281 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 10282 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 10283 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 10284 } 10285 10286 /** 10287 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 10288 * measured width and measured height. Failing to do so will trigger an 10289 * exception at measurement time.</p> 10290 * 10291 * @param measuredWidth The measured width of this view. May be a complex 10292 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10293 * {@link #MEASURED_STATE_TOO_SMALL}. 10294 * @param measuredHeight The measured height of this view. May be a complex 10295 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10296 * {@link #MEASURED_STATE_TOO_SMALL}. 10297 */ 10298 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 10299 mMeasuredWidth = measuredWidth; 10300 mMeasuredHeight = measuredHeight; 10301 10302 mPrivateFlags |= MEASURED_DIMENSION_SET; 10303 } 10304 10305 /** 10306 * Merge two states as returned by {@link #getMeasuredState()}. 10307 * @param curState The current state as returned from a view or the result 10308 * of combining multiple views. 10309 * @param newState The new view state to combine. 10310 * @return Returns a new integer reflecting the combination of the two 10311 * states. 10312 */ 10313 public static int combineMeasuredStates(int curState, int newState) { 10314 return curState | newState; 10315 } 10316 10317 /** 10318 * Version of {@link #resolveSizeAndState(int, int, int)} 10319 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 10320 */ 10321 public static int resolveSize(int size, int measureSpec) { 10322 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 10323 } 10324 10325 /** 10326 * Utility to reconcile a desired size and state, with constraints imposed 10327 * by a MeasureSpec. Will take the desired size, unless a different size 10328 * is imposed by the constraints. The returned value is a compound integer, 10329 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 10330 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 10331 * size is smaller than the size the view wants to be. 10332 * 10333 * @param size How big the view wants to be 10334 * @param measureSpec Constraints imposed by the parent 10335 * @return Size information bit mask as defined by 10336 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 10337 */ 10338 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 10339 int result = size; 10340 int specMode = MeasureSpec.getMode(measureSpec); 10341 int specSize = MeasureSpec.getSize(measureSpec); 10342 switch (specMode) { 10343 case MeasureSpec.UNSPECIFIED: 10344 result = size; 10345 break; 10346 case MeasureSpec.AT_MOST: 10347 if (specSize < size) { 10348 result = specSize | MEASURED_STATE_TOO_SMALL; 10349 } else { 10350 result = size; 10351 } 10352 break; 10353 case MeasureSpec.EXACTLY: 10354 result = specSize; 10355 break; 10356 } 10357 return result | (childMeasuredState&MEASURED_STATE_MASK); 10358 } 10359 10360 /** 10361 * Utility to return a default size. Uses the supplied size if the 10362 * MeasureSpec imposed no contraints. Will get larger if allowed 10363 * by the MeasureSpec. 10364 * 10365 * @param size Default size for this view 10366 * @param measureSpec Constraints imposed by the parent 10367 * @return The size this view should be. 10368 */ 10369 public static int getDefaultSize(int size, int measureSpec) { 10370 int result = size; 10371 int specMode = MeasureSpec.getMode(measureSpec); 10372 int specSize = MeasureSpec.getSize(measureSpec); 10373 10374 switch (specMode) { 10375 case MeasureSpec.UNSPECIFIED: 10376 result = size; 10377 break; 10378 case MeasureSpec.AT_MOST: 10379 case MeasureSpec.EXACTLY: 10380 result = specSize; 10381 break; 10382 } 10383 return result; 10384 } 10385 10386 /** 10387 * Returns the suggested minimum height that the view should use. This 10388 * returns the maximum of the view's minimum height 10389 * and the background's minimum height 10390 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 10391 * <p> 10392 * When being used in {@link #onMeasure(int, int)}, the caller should still 10393 * ensure the returned height is within the requirements of the parent. 10394 * 10395 * @return The suggested minimum height of the view. 10396 */ 10397 protected int getSuggestedMinimumHeight() { 10398 int suggestedMinHeight = mMinHeight; 10399 10400 if (mBGDrawable != null) { 10401 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 10402 if (suggestedMinHeight < bgMinHeight) { 10403 suggestedMinHeight = bgMinHeight; 10404 } 10405 } 10406 10407 return suggestedMinHeight; 10408 } 10409 10410 /** 10411 * Returns the suggested minimum width that the view should use. This 10412 * returns the maximum of the view's minimum width) 10413 * and the background's minimum width 10414 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 10415 * <p> 10416 * When being used in {@link #onMeasure(int, int)}, the caller should still 10417 * ensure the returned width is within the requirements of the parent. 10418 * 10419 * @return The suggested minimum width of the view. 10420 */ 10421 protected int getSuggestedMinimumWidth() { 10422 int suggestedMinWidth = mMinWidth; 10423 10424 if (mBGDrawable != null) { 10425 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 10426 if (suggestedMinWidth < bgMinWidth) { 10427 suggestedMinWidth = bgMinWidth; 10428 } 10429 } 10430 10431 return suggestedMinWidth; 10432 } 10433 10434 /** 10435 * Sets the minimum height of the view. It is not guaranteed the view will 10436 * be able to achieve this minimum height (for example, if its parent layout 10437 * constrains it with less available height). 10438 * 10439 * @param minHeight The minimum height the view will try to be. 10440 */ 10441 public void setMinimumHeight(int minHeight) { 10442 mMinHeight = minHeight; 10443 } 10444 10445 /** 10446 * Sets the minimum width of the view. It is not guaranteed the view will 10447 * be able to achieve this minimum width (for example, if its parent layout 10448 * constrains it with less available width). 10449 * 10450 * @param minWidth The minimum width the view will try to be. 10451 */ 10452 public void setMinimumWidth(int minWidth) { 10453 mMinWidth = minWidth; 10454 } 10455 10456 /** 10457 * Get the animation currently associated with this view. 10458 * 10459 * @return The animation that is currently playing or 10460 * scheduled to play for this view. 10461 */ 10462 public Animation getAnimation() { 10463 return mCurrentAnimation; 10464 } 10465 10466 /** 10467 * Start the specified animation now. 10468 * 10469 * @param animation the animation to start now 10470 */ 10471 public void startAnimation(Animation animation) { 10472 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 10473 setAnimation(animation); 10474 invalidate(); 10475 } 10476 10477 /** 10478 * Cancels any animations for this view. 10479 */ 10480 public void clearAnimation() { 10481 if (mCurrentAnimation != null) { 10482 mCurrentAnimation.detach(); 10483 } 10484 mCurrentAnimation = null; 10485 } 10486 10487 /** 10488 * Sets the next animation to play for this view. 10489 * If you want the animation to play immediately, use 10490 * startAnimation. This method provides allows fine-grained 10491 * control over the start time and invalidation, but you 10492 * must make sure that 1) the animation has a start time set, and 10493 * 2) the view will be invalidated when the animation is supposed to 10494 * start. 10495 * 10496 * @param animation The next animation, or null. 10497 */ 10498 public void setAnimation(Animation animation) { 10499 mCurrentAnimation = animation; 10500 if (animation != null) { 10501 animation.reset(); 10502 } 10503 } 10504 10505 /** 10506 * Invoked by a parent ViewGroup to notify the start of the animation 10507 * currently associated with this view. If you override this method, 10508 * always call super.onAnimationStart(); 10509 * 10510 * @see #setAnimation(android.view.animation.Animation) 10511 * @see #getAnimation() 10512 */ 10513 protected void onAnimationStart() { 10514 mPrivateFlags |= ANIMATION_STARTED; 10515 } 10516 10517 /** 10518 * Invoked by a parent ViewGroup to notify the end of the animation 10519 * currently associated with this view. If you override this method, 10520 * always call super.onAnimationEnd(); 10521 * 10522 * @see #setAnimation(android.view.animation.Animation) 10523 * @see #getAnimation() 10524 */ 10525 protected void onAnimationEnd() { 10526 mPrivateFlags &= ~ANIMATION_STARTED; 10527 } 10528 10529 /** 10530 * Invoked if there is a Transform that involves alpha. Subclass that can 10531 * draw themselves with the specified alpha should return true, and then 10532 * respect that alpha when their onDraw() is called. If this returns false 10533 * then the view may be redirected to draw into an offscreen buffer to 10534 * fulfill the request, which will look fine, but may be slower than if the 10535 * subclass handles it internally. The default implementation returns false. 10536 * 10537 * @param alpha The alpha (0..255) to apply to the view's drawing 10538 * @return true if the view can draw with the specified alpha. 10539 */ 10540 protected boolean onSetAlpha(int alpha) { 10541 return false; 10542 } 10543 10544 /** 10545 * This is used by the RootView to perform an optimization when 10546 * the view hierarchy contains one or several SurfaceView. 10547 * SurfaceView is always considered transparent, but its children are not, 10548 * therefore all View objects remove themselves from the global transparent 10549 * region (passed as a parameter to this function). 10550 * 10551 * @param region The transparent region for this ViewRoot (window). 10552 * 10553 * @return Returns true if the effective visibility of the view at this 10554 * point is opaque, regardless of the transparent region; returns false 10555 * if it is possible for underlying windows to be seen behind the view. 10556 * 10557 * {@hide} 10558 */ 10559 public boolean gatherTransparentRegion(Region region) { 10560 final AttachInfo attachInfo = mAttachInfo; 10561 if (region != null && attachInfo != null) { 10562 final int pflags = mPrivateFlags; 10563 if ((pflags & SKIP_DRAW) == 0) { 10564 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 10565 // remove it from the transparent region. 10566 final int[] location = attachInfo.mTransparentLocation; 10567 getLocationInWindow(location); 10568 region.op(location[0], location[1], location[0] + mRight - mLeft, 10569 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 10570 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 10571 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 10572 // exists, so we remove the background drawable's non-transparent 10573 // parts from this transparent region. 10574 applyDrawableToTransparentRegion(mBGDrawable, region); 10575 } 10576 } 10577 return true; 10578 } 10579 10580 /** 10581 * Play a sound effect for this view. 10582 * 10583 * <p>The framework will play sound effects for some built in actions, such as 10584 * clicking, but you may wish to play these effects in your widget, 10585 * for instance, for internal navigation. 10586 * 10587 * <p>The sound effect will only be played if sound effects are enabled by the user, and 10588 * {@link #isSoundEffectsEnabled()} is true. 10589 * 10590 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 10591 */ 10592 public void playSoundEffect(int soundConstant) { 10593 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 10594 return; 10595 } 10596 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 10597 } 10598 10599 /** 10600 * BZZZTT!!1! 10601 * 10602 * <p>Provide haptic feedback to the user for this view. 10603 * 10604 * <p>The framework will provide haptic feedback for some built in actions, 10605 * such as long presses, but you may wish to provide feedback for your 10606 * own widget. 10607 * 10608 * <p>The feedback will only be performed if 10609 * {@link #isHapticFeedbackEnabled()} is true. 10610 * 10611 * @param feedbackConstant One of the constants defined in 10612 * {@link HapticFeedbackConstants} 10613 */ 10614 public boolean performHapticFeedback(int feedbackConstant) { 10615 return performHapticFeedback(feedbackConstant, 0); 10616 } 10617 10618 /** 10619 * BZZZTT!!1! 10620 * 10621 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 10622 * 10623 * @param feedbackConstant One of the constants defined in 10624 * {@link HapticFeedbackConstants} 10625 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 10626 */ 10627 public boolean performHapticFeedback(int feedbackConstant, int flags) { 10628 if (mAttachInfo == null) { 10629 return false; 10630 } 10631 //noinspection SimplifiableIfStatement 10632 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 10633 && !isHapticFeedbackEnabled()) { 10634 return false; 10635 } 10636 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 10637 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 10638 } 10639 10640 /** 10641 * !!! TODO: real docs 10642 * 10643 * The base class implementation makes the shadow the same size and appearance 10644 * as the view itself, and positions it with its center at the touch point. 10645 */ 10646 public static class DragShadowBuilder { 10647 private final WeakReference<View> mView; 10648 10649 /** 10650 * Construct a shadow builder object for use with the given View object. The 10651 * default implementation will construct a drag shadow the same size and 10652 * appearance as the supplied View. 10653 * 10654 * @param view A view within the application's layout whose appearance 10655 * should be replicated as the drag shadow. 10656 */ 10657 public DragShadowBuilder(View view) { 10658 mView = new WeakReference<View>(view); 10659 } 10660 10661 /** 10662 * Construct a shadow builder object with no associated View. This 10663 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 10664 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 10665 * to supply the drag shadow's dimensions and appearance without 10666 * reference to any View object. 10667 */ 10668 public DragShadowBuilder() { 10669 mView = new WeakReference<View>(null); 10670 } 10671 10672 /** 10673 * Returns the View object that had been passed to the 10674 * {@link #View.DragShadowBuilder(View)} 10675 * constructor. If that View parameter was {@code null} or if the 10676 * {@link #View.DragShadowBuilder()} 10677 * constructor was used to instantiate the builder object, this method will return 10678 * null. 10679 * 10680 * @return The View object associate with this builder object. 10681 */ 10682 final public View getView() { 10683 return mView.get(); 10684 } 10685 10686 /** 10687 * Provide the draggable-shadow metrics for the operation: the dimensions of 10688 * the shadow image itself, and the point within that shadow that should 10689 * be centered under the touch location while dragging. 10690 * <p> 10691 * The default implementation sets the dimensions of the shadow to be the 10692 * same as the dimensions of the View object that had been supplied to the 10693 * {@link #View.DragShadowBuilder(View)} constructor 10694 * when the builder object was instantiated, and centers the shadow under the touch 10695 * point. 10696 * 10697 * @param shadowSize The application should set the {@code x} member of this 10698 * parameter to the desired shadow width, and the {@code y} member to 10699 * the desired height. 10700 * @param shadowTouchPoint The application should set this point to be the 10701 * location within the shadow that should track directly underneath 10702 * the touch point on the screen during a drag. 10703 */ 10704 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 10705 final View view = mView.get(); 10706 if (view != null) { 10707 shadowSize.set(view.getWidth(), view.getHeight()); 10708 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 10709 } else { 10710 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 10711 } 10712 } 10713 10714 /** 10715 * Draw the shadow image for the upcoming drag. The shadow canvas was 10716 * created with the dimensions supplied by the 10717 * {@link #onProvideShadowMetrics(Point, Point)} callback. 10718 * <p> 10719 * The default implementation replicates the appearance of the View object 10720 * that had been supplied to the 10721 * {@link #View.DragShadowBuilder(View)} 10722 * constructor when the builder object was instantiated. 10723 * 10724 * @param canvas 10725 */ 10726 public void onDrawShadow(Canvas canvas) { 10727 final View view = mView.get(); 10728 if (view != null) { 10729 view.draw(canvas); 10730 } else { 10731 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 10732 } 10733 } 10734 } 10735 10736 /** 10737 * Drag and drop. App calls startDrag(), then callbacks to the shadow builder's 10738 * {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} and 10739 * {@link DragShadowBuilder#onDrawShadow(Canvas)} methods happen, then the drag 10740 * operation is handed over to the OS. 10741 * !!! TODO: real docs 10742 * 10743 * @param data !!! TODO 10744 * @param shadowBuilder !!! TODO 10745 * @param myLocalState An arbitrary object that will be passed as part of every DragEvent 10746 * delivered to the calling application during the course of the current drag operation. 10747 * This object is private to the application that called startDrag(), and is not 10748 * visible to other applications. It provides a lightweight way for the application to 10749 * propagate information from the initiator to the recipient of a drag within its own 10750 * application; for example, to help disambiguate between 'copy' and 'move' semantics. 10751 * @param flags Flags affecting the drag operation. At present no flags are defined; 10752 * pass 0 for this parameter. 10753 * @return {@code true} if the drag operation was initiated successfully; {@code false} if 10754 * an error prevented the drag from taking place. 10755 */ 10756 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 10757 Object myLocalState, int flags) { 10758 if (ViewDebug.DEBUG_DRAG) { 10759 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 10760 } 10761 boolean okay = false; 10762 10763 Point shadowSize = new Point(); 10764 Point shadowTouchPoint = new Point(); 10765 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 10766 10767 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 10768 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 10769 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 10770 } 10771 10772 if (ViewDebug.DEBUG_DRAG) { 10773 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 10774 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 10775 } 10776 Surface surface = new Surface(); 10777 try { 10778 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 10779 flags, shadowSize.x, shadowSize.y, surface); 10780 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 10781 + " surface=" + surface); 10782 if (token != null) { 10783 Canvas canvas = surface.lockCanvas(null); 10784 try { 10785 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 10786 shadowBuilder.onDrawShadow(canvas); 10787 } finally { 10788 surface.unlockCanvasAndPost(canvas); 10789 } 10790 10791 final ViewRoot root = getViewRoot(); 10792 10793 // Cache the local state object for delivery with DragEvents 10794 root.setLocalDragState(myLocalState); 10795 10796 // repurpose 'shadowSize' for the last touch point 10797 root.getLastTouchPoint(shadowSize); 10798 10799 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 10800 shadowSize.x, shadowSize.y, 10801 shadowTouchPoint.x, shadowTouchPoint.y, data); 10802 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 10803 } 10804 } catch (Exception e) { 10805 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 10806 surface.destroy(); 10807 } 10808 10809 return okay; 10810 } 10811 10812 /** 10813 * Drag-and-drop event dispatch. The event.getAction() verb is one of the DragEvent 10814 * constants DRAG_STARTED_EVENT, DRAG_EVENT, DROP_EVENT, and DRAG_ENDED_EVENT. 10815 * 10816 * For DRAG_STARTED_EVENT, event.getClipDescription() describes the content 10817 * being dragged. onDragEvent() should return 'true' if the view can handle 10818 * a drop of that content. A view that returns 'false' here will receive no 10819 * further calls to onDragEvent() about the drag/drop operation. 10820 * 10821 * For DRAG_ENTERED, event.getClipDescription() describes the content being 10822 * dragged. This will be the same content description passed in the 10823 * DRAG_STARTED_EVENT invocation. 10824 * 10825 * For DRAG_EXITED, event.getClipDescription() describes the content being 10826 * dragged. This will be the same content description passed in the 10827 * DRAG_STARTED_EVENT invocation. The view should return to its approriate 10828 * drag-acceptance visual state. 10829 * 10830 * For DRAG_LOCATION_EVENT, event.getX() and event.getY() give the location in View 10831 * coordinates of the current drag point. The view must return 'true' if it 10832 * can accept a drop of the current drag content, false otherwise. 10833 * 10834 * For DROP_EVENT, event.getX() and event.getY() give the location of the drop 10835 * within the view; also, event.getClipData() returns the full data payload 10836 * being dropped. The view should return 'true' if it consumed the dropped 10837 * content, 'false' if it did not. 10838 * 10839 * For DRAG_ENDED_EVENT, the 'event' argument may be null. The view should return 10840 * to its normal visual state. 10841 */ 10842 public boolean onDragEvent(DragEvent event) { 10843 return false; 10844 } 10845 10846 /** 10847 * Views typically don't need to override dispatchDragEvent(); it just calls 10848 * onDragEvent(event) and passes the result up appropriately. 10849 */ 10850 public boolean dispatchDragEvent(DragEvent event) { 10851 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 10852 && mOnDragListener.onDrag(this, event)) { 10853 return true; 10854 } 10855 return onDragEvent(event); 10856 } 10857 10858 /** 10859 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 10860 * it is ever exposed at all. 10861 * @hide 10862 */ 10863 public void onCloseSystemDialogs(String reason) { 10864 } 10865 10866 /** 10867 * Given a Drawable whose bounds have been set to draw into this view, 10868 * update a Region being computed for {@link #gatherTransparentRegion} so 10869 * that any non-transparent parts of the Drawable are removed from the 10870 * given transparent region. 10871 * 10872 * @param dr The Drawable whose transparency is to be applied to the region. 10873 * @param region A Region holding the current transparency information, 10874 * where any parts of the region that are set are considered to be 10875 * transparent. On return, this region will be modified to have the 10876 * transparency information reduced by the corresponding parts of the 10877 * Drawable that are not transparent. 10878 * {@hide} 10879 */ 10880 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 10881 if (DBG) { 10882 Log.i("View", "Getting transparent region for: " + this); 10883 } 10884 final Region r = dr.getTransparentRegion(); 10885 final Rect db = dr.getBounds(); 10886 final AttachInfo attachInfo = mAttachInfo; 10887 if (r != null && attachInfo != null) { 10888 final int w = getRight()-getLeft(); 10889 final int h = getBottom()-getTop(); 10890 if (db.left > 0) { 10891 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 10892 r.op(0, 0, db.left, h, Region.Op.UNION); 10893 } 10894 if (db.right < w) { 10895 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 10896 r.op(db.right, 0, w, h, Region.Op.UNION); 10897 } 10898 if (db.top > 0) { 10899 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 10900 r.op(0, 0, w, db.top, Region.Op.UNION); 10901 } 10902 if (db.bottom < h) { 10903 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 10904 r.op(0, db.bottom, w, h, Region.Op.UNION); 10905 } 10906 final int[] location = attachInfo.mTransparentLocation; 10907 getLocationInWindow(location); 10908 r.translate(location[0], location[1]); 10909 region.op(r, Region.Op.INTERSECT); 10910 } else { 10911 region.op(db, Region.Op.DIFFERENCE); 10912 } 10913 } 10914 10915 private void postCheckForLongClick(int delayOffset) { 10916 mHasPerformedLongPress = false; 10917 10918 if (mPendingCheckForLongPress == null) { 10919 mPendingCheckForLongPress = new CheckForLongPress(); 10920 } 10921 mPendingCheckForLongPress.rememberWindowAttachCount(); 10922 postDelayed(mPendingCheckForLongPress, 10923 ViewConfiguration.getLongPressTimeout() - delayOffset); 10924 } 10925 10926 /** 10927 * Inflate a view from an XML resource. This convenience method wraps the {@link 10928 * LayoutInflater} class, which provides a full range of options for view inflation. 10929 * 10930 * @param context The Context object for your activity or application. 10931 * @param resource The resource ID to inflate 10932 * @param root A view group that will be the parent. Used to properly inflate the 10933 * layout_* parameters. 10934 * @see LayoutInflater 10935 */ 10936 public static View inflate(Context context, int resource, ViewGroup root) { 10937 LayoutInflater factory = LayoutInflater.from(context); 10938 return factory.inflate(resource, root); 10939 } 10940 10941 /** 10942 * Scroll the view with standard behavior for scrolling beyond the normal 10943 * content boundaries. Views that call this method should override 10944 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 10945 * results of an over-scroll operation. 10946 * 10947 * Views can use this method to handle any touch or fling-based scrolling. 10948 * 10949 * @param deltaX Change in X in pixels 10950 * @param deltaY Change in Y in pixels 10951 * @param scrollX Current X scroll value in pixels before applying deltaX 10952 * @param scrollY Current Y scroll value in pixels before applying deltaY 10953 * @param scrollRangeX Maximum content scroll range along the X axis 10954 * @param scrollRangeY Maximum content scroll range along the Y axis 10955 * @param maxOverScrollX Number of pixels to overscroll by in either direction 10956 * along the X axis. 10957 * @param maxOverScrollY Number of pixels to overscroll by in either direction 10958 * along the Y axis. 10959 * @param isTouchEvent true if this scroll operation is the result of a touch event. 10960 * @return true if scrolling was clamped to an over-scroll boundary along either 10961 * axis, false otherwise. 10962 */ 10963 protected boolean overScrollBy(int deltaX, int deltaY, 10964 int scrollX, int scrollY, 10965 int scrollRangeX, int scrollRangeY, 10966 int maxOverScrollX, int maxOverScrollY, 10967 boolean isTouchEvent) { 10968 final int overScrollMode = mOverScrollMode; 10969 final boolean canScrollHorizontal = 10970 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 10971 final boolean canScrollVertical = 10972 computeVerticalScrollRange() > computeVerticalScrollExtent(); 10973 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 10974 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 10975 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 10976 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 10977 10978 int newScrollX = scrollX + deltaX; 10979 if (!overScrollHorizontal) { 10980 maxOverScrollX = 0; 10981 } 10982 10983 int newScrollY = scrollY + deltaY; 10984 if (!overScrollVertical) { 10985 maxOverScrollY = 0; 10986 } 10987 10988 // Clamp values if at the limits and record 10989 final int left = -maxOverScrollX; 10990 final int right = maxOverScrollX + scrollRangeX; 10991 final int top = -maxOverScrollY; 10992 final int bottom = maxOverScrollY + scrollRangeY; 10993 10994 boolean clampedX = false; 10995 if (newScrollX > right) { 10996 newScrollX = right; 10997 clampedX = true; 10998 } else if (newScrollX < left) { 10999 newScrollX = left; 11000 clampedX = true; 11001 } 11002 11003 boolean clampedY = false; 11004 if (newScrollY > bottom) { 11005 newScrollY = bottom; 11006 clampedY = true; 11007 } else if (newScrollY < top) { 11008 newScrollY = top; 11009 clampedY = true; 11010 } 11011 11012 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 11013 11014 return clampedX || clampedY; 11015 } 11016 11017 /** 11018 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 11019 * respond to the results of an over-scroll operation. 11020 * 11021 * @param scrollX New X scroll value in pixels 11022 * @param scrollY New Y scroll value in pixels 11023 * @param clampedX True if scrollX was clamped to an over-scroll boundary 11024 * @param clampedY True if scrollY was clamped to an over-scroll boundary 11025 */ 11026 protected void onOverScrolled(int scrollX, int scrollY, 11027 boolean clampedX, boolean clampedY) { 11028 // Intentionally empty. 11029 } 11030 11031 /** 11032 * Returns the over-scroll mode for this view. The result will be 11033 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11034 * (allow over-scrolling only if the view content is larger than the container), 11035 * or {@link #OVER_SCROLL_NEVER}. 11036 * 11037 * @return This view's over-scroll mode. 11038 */ 11039 public int getOverScrollMode() { 11040 return mOverScrollMode; 11041 } 11042 11043 /** 11044 * Set the over-scroll mode for this view. Valid over-scroll modes are 11045 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11046 * (allow over-scrolling only if the view content is larger than the container), 11047 * or {@link #OVER_SCROLL_NEVER}. 11048 * 11049 * Setting the over-scroll mode of a view will have an effect only if the 11050 * view is capable of scrolling. 11051 * 11052 * @param overScrollMode The new over-scroll mode for this view. 11053 */ 11054 public void setOverScrollMode(int overScrollMode) { 11055 if (overScrollMode != OVER_SCROLL_ALWAYS && 11056 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 11057 overScrollMode != OVER_SCROLL_NEVER) { 11058 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 11059 } 11060 mOverScrollMode = overScrollMode; 11061 } 11062 11063 /** 11064 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 11065 * Each MeasureSpec represents a requirement for either the width or the height. 11066 * A MeasureSpec is comprised of a size and a mode. There are three possible 11067 * modes: 11068 * <dl> 11069 * <dt>UNSPECIFIED</dt> 11070 * <dd> 11071 * The parent has not imposed any constraint on the child. It can be whatever size 11072 * it wants. 11073 * </dd> 11074 * 11075 * <dt>EXACTLY</dt> 11076 * <dd> 11077 * The parent has determined an exact size for the child. The child is going to be 11078 * given those bounds regardless of how big it wants to be. 11079 * </dd> 11080 * 11081 * <dt>AT_MOST</dt> 11082 * <dd> 11083 * The child can be as large as it wants up to the specified size. 11084 * </dd> 11085 * </dl> 11086 * 11087 * MeasureSpecs are implemented as ints to reduce object allocation. This class 11088 * is provided to pack and unpack the <size, mode> tuple into the int. 11089 */ 11090 public static class MeasureSpec { 11091 private static final int MODE_SHIFT = 30; 11092 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 11093 11094 /** 11095 * Measure specification mode: The parent has not imposed any constraint 11096 * on the child. It can be whatever size it wants. 11097 */ 11098 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 11099 11100 /** 11101 * Measure specification mode: The parent has determined an exact size 11102 * for the child. The child is going to be given those bounds regardless 11103 * of how big it wants to be. 11104 */ 11105 public static final int EXACTLY = 1 << MODE_SHIFT; 11106 11107 /** 11108 * Measure specification mode: The child can be as large as it wants up 11109 * to the specified size. 11110 */ 11111 public static final int AT_MOST = 2 << MODE_SHIFT; 11112 11113 /** 11114 * Creates a measure specification based on the supplied size and mode. 11115 * 11116 * The mode must always be one of the following: 11117 * <ul> 11118 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 11119 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 11120 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 11121 * </ul> 11122 * 11123 * @param size the size of the measure specification 11124 * @param mode the mode of the measure specification 11125 * @return the measure specification based on size and mode 11126 */ 11127 public static int makeMeasureSpec(int size, int mode) { 11128 return size + mode; 11129 } 11130 11131 /** 11132 * Extracts the mode from the supplied measure specification. 11133 * 11134 * @param measureSpec the measure specification to extract the mode from 11135 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 11136 * {@link android.view.View.MeasureSpec#AT_MOST} or 11137 * {@link android.view.View.MeasureSpec#EXACTLY} 11138 */ 11139 public static int getMode(int measureSpec) { 11140 return (measureSpec & MODE_MASK); 11141 } 11142 11143 /** 11144 * Extracts the size from the supplied measure specification. 11145 * 11146 * @param measureSpec the measure specification to extract the size from 11147 * @return the size in pixels defined in the supplied measure specification 11148 */ 11149 public static int getSize(int measureSpec) { 11150 return (measureSpec & ~MODE_MASK); 11151 } 11152 11153 /** 11154 * Returns a String representation of the specified measure 11155 * specification. 11156 * 11157 * @param measureSpec the measure specification to convert to a String 11158 * @return a String with the following format: "MeasureSpec: MODE SIZE" 11159 */ 11160 public static String toString(int measureSpec) { 11161 int mode = getMode(measureSpec); 11162 int size = getSize(measureSpec); 11163 11164 StringBuilder sb = new StringBuilder("MeasureSpec: "); 11165 11166 if (mode == UNSPECIFIED) 11167 sb.append("UNSPECIFIED "); 11168 else if (mode == EXACTLY) 11169 sb.append("EXACTLY "); 11170 else if (mode == AT_MOST) 11171 sb.append("AT_MOST "); 11172 else 11173 sb.append(mode).append(" "); 11174 11175 sb.append(size); 11176 return sb.toString(); 11177 } 11178 } 11179 11180 class CheckForLongPress implements Runnable { 11181 11182 private int mOriginalWindowAttachCount; 11183 11184 public void run() { 11185 if (isPressed() && (mParent != null) 11186 && mOriginalWindowAttachCount == mWindowAttachCount) { 11187 if (performLongClick()) { 11188 mHasPerformedLongPress = true; 11189 } 11190 } 11191 } 11192 11193 public void rememberWindowAttachCount() { 11194 mOriginalWindowAttachCount = mWindowAttachCount; 11195 } 11196 } 11197 11198 private final class CheckForTap implements Runnable { 11199 public void run() { 11200 mPrivateFlags &= ~PREPRESSED; 11201 mPrivateFlags |= PRESSED; 11202 refreshDrawableState(); 11203 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 11204 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 11205 } 11206 } 11207 } 11208 11209 private final class PerformClick implements Runnable { 11210 public void run() { 11211 performClick(); 11212 } 11213 } 11214 11215 /** 11216 * Interface definition for a callback to be invoked when a key event is 11217 * dispatched to this view. The callback will be invoked before the key 11218 * event is given to the view. 11219 */ 11220 public interface OnKeyListener { 11221 /** 11222 * Called when a key is dispatched to a view. This allows listeners to 11223 * get a chance to respond before the target view. 11224 * 11225 * @param v The view the key has been dispatched to. 11226 * @param keyCode The code for the physical key that was pressed 11227 * @param event The KeyEvent object containing full information about 11228 * the event. 11229 * @return True if the listener has consumed the event, false otherwise. 11230 */ 11231 boolean onKey(View v, int keyCode, KeyEvent event); 11232 } 11233 11234 /** 11235 * Interface definition for a callback to be invoked when a touch event is 11236 * dispatched to this view. The callback will be invoked before the touch 11237 * event is given to the view. 11238 */ 11239 public interface OnTouchListener { 11240 /** 11241 * Called when a touch event is dispatched to a view. This allows listeners to 11242 * get a chance to respond before the target view. 11243 * 11244 * @param v The view the touch event has been dispatched to. 11245 * @param event The MotionEvent object containing full information about 11246 * the event. 11247 * @return True if the listener has consumed the event, false otherwise. 11248 */ 11249 boolean onTouch(View v, MotionEvent event); 11250 } 11251 11252 /** 11253 * Interface definition for a callback to be invoked when a view has been clicked and held. 11254 */ 11255 public interface OnLongClickListener { 11256 /** 11257 * Called when a view has been clicked and held. 11258 * 11259 * @param v The view that was clicked and held. 11260 * 11261 * @return true if the callback consumed the long click, false otherwise. 11262 */ 11263 boolean onLongClick(View v); 11264 } 11265 11266 /** 11267 * Interface definition for a callback to be invoked when a drag is being dispatched 11268 * to this view. The callback will be invoked before the hosting view's own 11269 * onDrag(event) method. If the listener wants to fall back to the hosting view's 11270 * onDrag(event) behavior, it should return 'false' from this callback. 11271 */ 11272 public interface OnDragListener { 11273 /** 11274 * Called when a drag event is dispatched to a view. This allows listeners 11275 * to get a chance to override base View behavior. 11276 * 11277 * @param v The view the drag has been dispatched to. 11278 * @param event The DragEvent object containing full information 11279 * about the event. 11280 * @return true if the listener consumed the DragEvent, false in order to fall 11281 * back to the view's default handling. 11282 */ 11283 boolean onDrag(View v, DragEvent event); 11284 } 11285 11286 /** 11287 * Interface definition for a callback to be invoked when the focus state of 11288 * a view changed. 11289 */ 11290 public interface OnFocusChangeListener { 11291 /** 11292 * Called when the focus state of a view has changed. 11293 * 11294 * @param v The view whose state has changed. 11295 * @param hasFocus The new focus state of v. 11296 */ 11297 void onFocusChange(View v, boolean hasFocus); 11298 } 11299 11300 /** 11301 * Interface definition for a callback to be invoked when a view is clicked. 11302 */ 11303 public interface OnClickListener { 11304 /** 11305 * Called when a view has been clicked. 11306 * 11307 * @param v The view that was clicked. 11308 */ 11309 void onClick(View v); 11310 } 11311 11312 /** 11313 * Interface definition for a callback to be invoked when the context menu 11314 * for this view is being built. 11315 */ 11316 public interface OnCreateContextMenuListener { 11317 /** 11318 * Called when the context menu for this view is being built. It is not 11319 * safe to hold onto the menu after this method returns. 11320 * 11321 * @param menu The context menu that is being built 11322 * @param v The view for which the context menu is being built 11323 * @param menuInfo Extra information about the item for which the 11324 * context menu should be shown. This information will vary 11325 * depending on the class of v. 11326 */ 11327 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 11328 } 11329 11330 private final class UnsetPressedState implements Runnable { 11331 public void run() { 11332 setPressed(false); 11333 } 11334 } 11335 11336 /** 11337 * Base class for derived classes that want to save and restore their own 11338 * state in {@link android.view.View#onSaveInstanceState()}. 11339 */ 11340 public static class BaseSavedState extends AbsSavedState { 11341 /** 11342 * Constructor used when reading from a parcel. Reads the state of the superclass. 11343 * 11344 * @param source 11345 */ 11346 public BaseSavedState(Parcel source) { 11347 super(source); 11348 } 11349 11350 /** 11351 * Constructor called by derived classes when creating their SavedState objects 11352 * 11353 * @param superState The state of the superclass of this view 11354 */ 11355 public BaseSavedState(Parcelable superState) { 11356 super(superState); 11357 } 11358 11359 public static final Parcelable.Creator<BaseSavedState> CREATOR = 11360 new Parcelable.Creator<BaseSavedState>() { 11361 public BaseSavedState createFromParcel(Parcel in) { 11362 return new BaseSavedState(in); 11363 } 11364 11365 public BaseSavedState[] newArray(int size) { 11366 return new BaseSavedState[size]; 11367 } 11368 }; 11369 } 11370 11371 /** 11372 * A set of information given to a view when it is attached to its parent 11373 * window. 11374 */ 11375 static class AttachInfo { 11376 interface Callbacks { 11377 void playSoundEffect(int effectId); 11378 boolean performHapticFeedback(int effectId, boolean always); 11379 } 11380 11381 /** 11382 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 11383 * to a Handler. This class contains the target (View) to invalidate and 11384 * the coordinates of the dirty rectangle. 11385 * 11386 * For performance purposes, this class also implements a pool of up to 11387 * POOL_LIMIT objects that get reused. This reduces memory allocations 11388 * whenever possible. 11389 */ 11390 static class InvalidateInfo implements Poolable<InvalidateInfo> { 11391 private static final int POOL_LIMIT = 10; 11392 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 11393 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 11394 public InvalidateInfo newInstance() { 11395 return new InvalidateInfo(); 11396 } 11397 11398 public void onAcquired(InvalidateInfo element) { 11399 } 11400 11401 public void onReleased(InvalidateInfo element) { 11402 } 11403 }, POOL_LIMIT) 11404 ); 11405 11406 private InvalidateInfo mNext; 11407 11408 View target; 11409 11410 int left; 11411 int top; 11412 int right; 11413 int bottom; 11414 11415 public void setNextPoolable(InvalidateInfo element) { 11416 mNext = element; 11417 } 11418 11419 public InvalidateInfo getNextPoolable() { 11420 return mNext; 11421 } 11422 11423 static InvalidateInfo acquire() { 11424 return sPool.acquire(); 11425 } 11426 11427 void release() { 11428 sPool.release(this); 11429 } 11430 } 11431 11432 final IWindowSession mSession; 11433 11434 final IWindow mWindow; 11435 11436 final IBinder mWindowToken; 11437 11438 final Callbacks mRootCallbacks; 11439 11440 /** 11441 * The top view of the hierarchy. 11442 */ 11443 View mRootView; 11444 11445 IBinder mPanelParentWindowToken; 11446 Surface mSurface; 11447 11448 boolean mHardwareAccelerated; 11449 boolean mHardwareAccelerationRequested; 11450 HardwareRenderer mHardwareRenderer; 11451 11452 /** 11453 * Scale factor used by the compatibility mode 11454 */ 11455 float mApplicationScale; 11456 11457 /** 11458 * Indicates whether the application is in compatibility mode 11459 */ 11460 boolean mScalingRequired; 11461 11462 /** 11463 * Left position of this view's window 11464 */ 11465 int mWindowLeft; 11466 11467 /** 11468 * Top position of this view's window 11469 */ 11470 int mWindowTop; 11471 11472 /** 11473 * Indicates whether views need to use 32-bit drawing caches 11474 */ 11475 boolean mUse32BitDrawingCache; 11476 11477 /** 11478 * For windows that are full-screen but using insets to layout inside 11479 * of the screen decorations, these are the current insets for the 11480 * content of the window. 11481 */ 11482 final Rect mContentInsets = new Rect(); 11483 11484 /** 11485 * For windows that are full-screen but using insets to layout inside 11486 * of the screen decorations, these are the current insets for the 11487 * actual visible parts of the window. 11488 */ 11489 final Rect mVisibleInsets = new Rect(); 11490 11491 /** 11492 * The internal insets given by this window. This value is 11493 * supplied by the client (through 11494 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 11495 * be given to the window manager when changed to be used in laying 11496 * out windows behind it. 11497 */ 11498 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 11499 = new ViewTreeObserver.InternalInsetsInfo(); 11500 11501 /** 11502 * All views in the window's hierarchy that serve as scroll containers, 11503 * used to determine if the window can be resized or must be panned 11504 * to adjust for a soft input area. 11505 */ 11506 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 11507 11508 final KeyEvent.DispatcherState mKeyDispatchState 11509 = new KeyEvent.DispatcherState(); 11510 11511 /** 11512 * Indicates whether the view's window currently has the focus. 11513 */ 11514 boolean mHasWindowFocus; 11515 11516 /** 11517 * The current visibility of the window. 11518 */ 11519 int mWindowVisibility; 11520 11521 /** 11522 * Indicates the time at which drawing started to occur. 11523 */ 11524 long mDrawingTime; 11525 11526 /** 11527 * Indicates whether or not ignoring the DIRTY_MASK flags. 11528 */ 11529 boolean mIgnoreDirtyState; 11530 11531 /** 11532 * Indicates whether the view's window is currently in touch mode. 11533 */ 11534 boolean mInTouchMode; 11535 11536 /** 11537 * Indicates that ViewRoot should trigger a global layout change 11538 * the next time it performs a traversal 11539 */ 11540 boolean mRecomputeGlobalAttributes; 11541 11542 /** 11543 * Set during a traveral if any views want to keep the screen on. 11544 */ 11545 boolean mKeepScreenOn; 11546 11547 /** 11548 * Set if the visibility of any views has changed. 11549 */ 11550 boolean mViewVisibilityChanged; 11551 11552 /** 11553 * Set to true if a view has been scrolled. 11554 */ 11555 boolean mViewScrollChanged; 11556 11557 /** 11558 * Global to the view hierarchy used as a temporary for dealing with 11559 * x/y points in the transparent region computations. 11560 */ 11561 final int[] mTransparentLocation = new int[2]; 11562 11563 /** 11564 * Global to the view hierarchy used as a temporary for dealing with 11565 * x/y points in the ViewGroup.invalidateChild implementation. 11566 */ 11567 final int[] mInvalidateChildLocation = new int[2]; 11568 11569 11570 /** 11571 * Global to the view hierarchy used as a temporary for dealing with 11572 * x/y location when view is transformed. 11573 */ 11574 final float[] mTmpTransformLocation = new float[2]; 11575 11576 /** 11577 * The view tree observer used to dispatch global events like 11578 * layout, pre-draw, touch mode change, etc. 11579 */ 11580 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 11581 11582 /** 11583 * A Canvas used by the view hierarchy to perform bitmap caching. 11584 */ 11585 Canvas mCanvas; 11586 11587 /** 11588 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 11589 * handler can be used to pump events in the UI events queue. 11590 */ 11591 final Handler mHandler; 11592 11593 /** 11594 * Identifier for messages requesting the view to be invalidated. 11595 * Such messages should be sent to {@link #mHandler}. 11596 */ 11597 static final int INVALIDATE_MSG = 0x1; 11598 11599 /** 11600 * Identifier for messages requesting the view to invalidate a region. 11601 * Such messages should be sent to {@link #mHandler}. 11602 */ 11603 static final int INVALIDATE_RECT_MSG = 0x2; 11604 11605 /** 11606 * Temporary for use in computing invalidate rectangles while 11607 * calling up the hierarchy. 11608 */ 11609 final Rect mTmpInvalRect = new Rect(); 11610 11611 /** 11612 * Temporary for use in computing hit areas with transformed views 11613 */ 11614 final RectF mTmpTransformRect = new RectF(); 11615 11616 /** 11617 * Temporary list for use in collecting focusable descendents of a view. 11618 */ 11619 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 11620 11621 /** 11622 * Creates a new set of attachment information with the specified 11623 * events handler and thread. 11624 * 11625 * @param handler the events handler the view must use 11626 */ 11627 AttachInfo(IWindowSession session, IWindow window, 11628 Handler handler, Callbacks effectPlayer) { 11629 mSession = session; 11630 mWindow = window; 11631 mWindowToken = window.asBinder(); 11632 mHandler = handler; 11633 mRootCallbacks = effectPlayer; 11634 } 11635 } 11636 11637 /** 11638 * <p>ScrollabilityCache holds various fields used by a View when scrolling 11639 * is supported. This avoids keeping too many unused fields in most 11640 * instances of View.</p> 11641 */ 11642 private static class ScrollabilityCache implements Runnable { 11643 11644 /** 11645 * Scrollbars are not visible 11646 */ 11647 public static final int OFF = 0; 11648 11649 /** 11650 * Scrollbars are visible 11651 */ 11652 public static final int ON = 1; 11653 11654 /** 11655 * Scrollbars are fading away 11656 */ 11657 public static final int FADING = 2; 11658 11659 public boolean fadeScrollBars; 11660 11661 public int fadingEdgeLength; 11662 public int scrollBarDefaultDelayBeforeFade; 11663 public int scrollBarFadeDuration; 11664 11665 public int scrollBarSize; 11666 public ScrollBarDrawable scrollBar; 11667 public float[] interpolatorValues; 11668 public View host; 11669 11670 public final Paint paint; 11671 public final Matrix matrix; 11672 public Shader shader; 11673 11674 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 11675 11676 private static final float[] OPAQUE = { 255 }; 11677 private static final float[] TRANSPARENT = { 0.0f }; 11678 11679 /** 11680 * When fading should start. This time moves into the future every time 11681 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 11682 */ 11683 public long fadeStartTime; 11684 11685 11686 /** 11687 * The current state of the scrollbars: ON, OFF, or FADING 11688 */ 11689 public int state = OFF; 11690 11691 private int mLastColor; 11692 11693 public ScrollabilityCache(ViewConfiguration configuration, View host) { 11694 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 11695 scrollBarSize = configuration.getScaledScrollBarSize(); 11696 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 11697 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 11698 11699 paint = new Paint(); 11700 matrix = new Matrix(); 11701 // use use a height of 1, and then wack the matrix each time we 11702 // actually use it. 11703 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 11704 11705 paint.setShader(shader); 11706 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 11707 this.host = host; 11708 } 11709 11710 public void setFadeColor(int color) { 11711 if (color != 0 && color != mLastColor) { 11712 mLastColor = color; 11713 color |= 0xFF000000; 11714 11715 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 11716 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 11717 11718 paint.setShader(shader); 11719 // Restore the default transfer mode (src_over) 11720 paint.setXfermode(null); 11721 } 11722 } 11723 11724 public void run() { 11725 long now = AnimationUtils.currentAnimationTimeMillis(); 11726 if (now >= fadeStartTime) { 11727 11728 // the animation fades the scrollbars out by changing 11729 // the opacity (alpha) from fully opaque to fully 11730 // transparent 11731 int nextFrame = (int) now; 11732 int framesCount = 0; 11733 11734 Interpolator interpolator = scrollBarInterpolator; 11735 11736 // Start opaque 11737 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 11738 11739 // End transparent 11740 nextFrame += scrollBarFadeDuration; 11741 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 11742 11743 state = FADING; 11744 11745 // Kick off the fade animation 11746 host.invalidate(); 11747 } 11748 } 11749 11750 } 11751} 11752