View.java revision 9c0874408cfc6f6f4e4561973ca5ae52a5982db7
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import com.android.internal.R; 20import com.android.internal.util.Predicate; 21import com.android.internal.view.menu.MenuBuilder; 22 23import android.content.ClipData; 24import android.content.Context; 25import android.content.res.Configuration; 26import android.content.res.Resources; 27import android.content.res.TypedArray; 28import android.graphics.Bitmap; 29import android.graphics.Camera; 30import android.graphics.Canvas; 31import android.graphics.Interpolator; 32import android.graphics.LinearGradient; 33import android.graphics.Matrix; 34import android.graphics.Paint; 35import android.graphics.PixelFormat; 36import android.graphics.Point; 37import android.graphics.PorterDuff; 38import android.graphics.PorterDuffXfermode; 39import android.graphics.Rect; 40import android.graphics.RectF; 41import android.graphics.Region; 42import android.graphics.Shader; 43import android.graphics.drawable.ColorDrawable; 44import android.graphics.drawable.Drawable; 45import android.os.Handler; 46import android.os.IBinder; 47import android.os.Message; 48import android.os.Parcel; 49import android.os.Parcelable; 50import android.os.RemoteException; 51import android.os.SystemClock; 52import android.os.SystemProperties; 53import android.util.AttributeSet; 54import android.util.Log; 55import android.util.Pool; 56import android.util.Poolable; 57import android.util.PoolableManager; 58import android.util.Pools; 59import android.util.SparseArray; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.accessibility.AccessibilityEvent; 62import android.view.accessibility.AccessibilityEventSource; 63import android.view.accessibility.AccessibilityManager; 64import android.view.animation.Animation; 65import android.view.animation.AnimationUtils; 66import android.view.inputmethod.EditorInfo; 67import android.view.inputmethod.InputConnection; 68import android.view.inputmethod.InputMethodManager; 69import android.widget.ScrollBarDrawable; 70 71import java.lang.ref.WeakReference; 72import java.lang.reflect.InvocationTargetException; 73import java.lang.reflect.Method; 74import java.util.ArrayList; 75import java.util.Arrays; 76import java.util.List; 77import java.util.WeakHashMap; 78 79/** 80 * <p> 81 * This class represents the basic building block for user interface components. A View 82 * occupies a rectangular area on the screen and is responsible for drawing and 83 * event handling. View is the base class for <em>widgets</em>, which are 84 * used to create interactive UI components (buttons, text fields, etc.). The 85 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 86 * are invisible containers that hold other Views (or other ViewGroups) and define 87 * their layout properties. 88 * </p> 89 * 90 * <div class="special"> 91 * <p>For an introduction to using this class to develop your 92 * application's user interface, read the Developer Guide documentation on 93 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 94 * include: 95 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 96 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 97 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 103 * </p> 104 * </div> 105 * 106 * <a name="Using"></a> 107 * <h3>Using Views</h3> 108 * <p> 109 * All of the views in a window are arranged in a single tree. You can add views 110 * either from code or by specifying a tree of views in one or more XML layout 111 * files. There are many specialized subclasses of views that act as controls or 112 * are capable of displaying text, images, or other content. 113 * </p> 114 * <p> 115 * Once you have created a tree of views, there are typically a few types of 116 * common operations you may wish to perform: 117 * <ul> 118 * <li><strong>Set properties:</strong> for example setting the text of a 119 * {@link android.widget.TextView}. The available properties and the methods 120 * that set them will vary among the different subclasses of views. Note that 121 * properties that are known at build time can be set in the XML layout 122 * files.</li> 123 * <li><strong>Set focus:</strong> The framework will handled moving focus in 124 * response to user input. To force focus to a specific view, call 125 * {@link #requestFocus}.</li> 126 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 127 * that will be notified when something interesting happens to the view. For 128 * example, all views will let you set a listener to be notified when the view 129 * gains or loses focus. You can register such a listener using 130 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 131 * specialized listeners. For example, a Button exposes a listener to notify 132 * clients when the button is clicked.</li> 133 * <li><strong>Set visibility:</strong> You can hide or show views using 134 * {@link #setVisibility}.</li> 135 * </ul> 136 * </p> 137 * <p><em> 138 * Note: The Android framework is responsible for measuring, laying out and 139 * drawing views. You should not call methods that perform these actions on 140 * views yourself unless you are actually implementing a 141 * {@link android.view.ViewGroup}. 142 * </em></p> 143 * 144 * <a name="Lifecycle"></a> 145 * <h3>Implementing a Custom View</h3> 146 * 147 * <p> 148 * To implement a custom view, you will usually begin by providing overrides for 149 * some of the standard methods that the framework calls on all views. You do 150 * not need to override all of these methods. In fact, you can start by just 151 * overriding {@link #onDraw(android.graphics.Canvas)}. 152 * <table border="2" width="85%" align="center" cellpadding="5"> 153 * <thead> 154 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 155 * </thead> 156 * 157 * <tbody> 158 * <tr> 159 * <td rowspan="2">Creation</td> 160 * <td>Constructors</td> 161 * <td>There is a form of the constructor that are called when the view 162 * is created from code and a form that is called when the view is 163 * inflated from a layout file. The second form should parse and apply 164 * any attributes defined in the layout file. 165 * </td> 166 * </tr> 167 * <tr> 168 * <td><code>{@link #onFinishInflate()}</code></td> 169 * <td>Called after a view and all of its children has been inflated 170 * from XML.</td> 171 * </tr> 172 * 173 * <tr> 174 * <td rowspan="3">Layout</td> 175 * <td><code>{@link #onMeasure}</code></td> 176 * <td>Called to determine the size requirements for this view and all 177 * of its children. 178 * </td> 179 * </tr> 180 * <tr> 181 * <td><code>{@link #onLayout}</code></td> 182 * <td>Called when this view should assign a size and position to all 183 * of its children. 184 * </td> 185 * </tr> 186 * <tr> 187 * <td><code>{@link #onSizeChanged}</code></td> 188 * <td>Called when the size of this view has changed. 189 * </td> 190 * </tr> 191 * 192 * <tr> 193 * <td>Drawing</td> 194 * <td><code>{@link #onDraw}</code></td> 195 * <td>Called when the view should render its content. 196 * </td> 197 * </tr> 198 * 199 * <tr> 200 * <td rowspan="4">Event processing</td> 201 * <td><code>{@link #onKeyDown}</code></td> 202 * <td>Called when a new key event occurs. 203 * </td> 204 * </tr> 205 * <tr> 206 * <td><code>{@link #onKeyUp}</code></td> 207 * <td>Called when a key up event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onTrackballEvent}</code></td> 212 * <td>Called when a trackball motion event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTouchEvent}</code></td> 217 * <td>Called when a touch screen motion event occurs. 218 * </td> 219 * </tr> 220 * 221 * <tr> 222 * <td rowspan="2">Focus</td> 223 * <td><code>{@link #onFocusChanged}</code></td> 224 * <td>Called when the view gains or loses focus. 225 * </td> 226 * </tr> 227 * 228 * <tr> 229 * <td><code>{@link #onWindowFocusChanged}</code></td> 230 * <td>Called when the window containing the view gains or loses focus. 231 * </td> 232 * </tr> 233 * 234 * <tr> 235 * <td rowspan="3">Attaching</td> 236 * <td><code>{@link #onAttachedToWindow()}</code></td> 237 * <td>Called when the view is attached to a window. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td><code>{@link #onDetachedFromWindow}</code></td> 243 * <td>Called when the view is detached from its window. 244 * </td> 245 * </tr> 246 * 247 * <tr> 248 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 249 * <td>Called when the visibility of the window containing the view 250 * has changed. 251 * </td> 252 * </tr> 253 * </tbody> 254 * 255 * </table> 256 * </p> 257 * 258 * <a name="IDs"></a> 259 * <h3>IDs</h3> 260 * Views may have an integer id associated with them. These ids are typically 261 * assigned in the layout XML files, and are used to find specific views within 262 * the view tree. A common pattern is to: 263 * <ul> 264 * <li>Define a Button in the layout file and assign it a unique ID. 265 * <pre> 266 * <Button 267 * android:id="@+id/my_button" 268 * android:layout_width="wrap_content" 269 * android:layout_height="wrap_content" 270 * android:text="@string/my_button_text"/> 271 * </pre></li> 272 * <li>From the onCreate method of an Activity, find the Button 273 * <pre class="prettyprint"> 274 * Button myButton = (Button) findViewById(R.id.my_button); 275 * </pre></li> 276 * </ul> 277 * <p> 278 * View IDs need not be unique throughout the tree, but it is good practice to 279 * ensure that they are at least unique within the part of the tree you are 280 * searching. 281 * </p> 282 * 283 * <a name="Position"></a> 284 * <h3>Position</h3> 285 * <p> 286 * The geometry of a view is that of a rectangle. A view has a location, 287 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 288 * two dimensions, expressed as a width and a height. The unit for location 289 * and dimensions is the pixel. 290 * </p> 291 * 292 * <p> 293 * It is possible to retrieve the location of a view by invoking the methods 294 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 295 * coordinate of the rectangle representing the view. The latter returns the 296 * top, or Y, coordinate of the rectangle representing the view. These methods 297 * both return the location of the view relative to its parent. For instance, 298 * when getLeft() returns 20, that means the view is located 20 pixels to the 299 * right of the left edge of its direct parent. 300 * </p> 301 * 302 * <p> 303 * In addition, several convenience methods are offered to avoid unnecessary 304 * computations, namely {@link #getRight()} and {@link #getBottom()}. 305 * These methods return the coordinates of the right and bottom edges of the 306 * rectangle representing the view. For instance, calling {@link #getRight()} 307 * is similar to the following computation: <code>getLeft() + getWidth()</code> 308 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 309 * </p> 310 * 311 * <a name="SizePaddingMargins"></a> 312 * <h3>Size, padding and margins</h3> 313 * <p> 314 * The size of a view is expressed with a width and a height. A view actually 315 * possess two pairs of width and height values. 316 * </p> 317 * 318 * <p> 319 * The first pair is known as <em>measured width</em> and 320 * <em>measured height</em>. These dimensions define how big a view wants to be 321 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 322 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 323 * and {@link #getMeasuredHeight()}. 324 * </p> 325 * 326 * <p> 327 * The second pair is simply known as <em>width</em> and <em>height</em>, or 328 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 329 * dimensions define the actual size of the view on screen, at drawing time and 330 * after layout. These values may, but do not have to, be different from the 331 * measured width and height. The width and height can be obtained by calling 332 * {@link #getWidth()} and {@link #getHeight()}. 333 * </p> 334 * 335 * <p> 336 * To measure its dimensions, a view takes into account its padding. The padding 337 * is expressed in pixels for the left, top, right and bottom parts of the view. 338 * Padding can be used to offset the content of the view by a specific amount of 339 * pixels. For instance, a left padding of 2 will push the view's content by 340 * 2 pixels to the right of the left edge. Padding can be set using the 341 * {@link #setPadding(int, int, int, int)} method and queried by calling 342 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 343 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 344 * </p> 345 * 346 * <p> 347 * Even though a view can define a padding, it does not provide any support for 348 * margins. However, view groups provide such a support. Refer to 349 * {@link android.view.ViewGroup} and 350 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 351 * </p> 352 * 353 * <a name="Layout"></a> 354 * <h3>Layout</h3> 355 * <p> 356 * Layout is a two pass process: a measure pass and a layout pass. The measuring 357 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 358 * of the view tree. Each view pushes dimension specifications down the tree 359 * during the recursion. At the end of the measure pass, every view has stored 360 * its measurements. The second pass happens in 361 * {@link #layout(int,int,int,int)} and is also top-down. During 362 * this pass each parent is responsible for positioning all of its children 363 * using the sizes computed in the measure pass. 364 * </p> 365 * 366 * <p> 367 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 368 * {@link #getMeasuredHeight()} values must be set, along with those for all of 369 * that view's descendants. A view's measured width and measured height values 370 * must respect the constraints imposed by the view's parents. This guarantees 371 * that at the end of the measure pass, all parents accept all of their 372 * children's measurements. A parent view may call measure() more than once on 373 * its children. For example, the parent may measure each child once with 374 * unspecified dimensions to find out how big they want to be, then call 375 * measure() on them again with actual numbers if the sum of all the children's 376 * unconstrained sizes is too big or too small. 377 * </p> 378 * 379 * <p> 380 * The measure pass uses two classes to communicate dimensions. The 381 * {@link MeasureSpec} class is used by views to tell their parents how they 382 * want to be measured and positioned. The base LayoutParams class just 383 * describes how big the view wants to be for both width and height. For each 384 * dimension, it can specify one of: 385 * <ul> 386 * <li> an exact number 387 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 388 * (minus padding) 389 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 390 * enclose its content (plus padding). 391 * </ul> 392 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 393 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 394 * an X and Y value. 395 * </p> 396 * 397 * <p> 398 * MeasureSpecs are used to push requirements down the tree from parent to 399 * child. A MeasureSpec can be in one of three modes: 400 * <ul> 401 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 402 * of a child view. For example, a LinearLayout may call measure() on its child 403 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 404 * tall the child view wants to be given a width of 240 pixels. 405 * <li>EXACTLY: This is used by the parent to impose an exact size on the 406 * child. The child must use this size, and guarantee that all of its 407 * descendants will fit within this size. 408 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 409 * child. The child must gurantee that it and all of its descendants will fit 410 * within this size. 411 * </ul> 412 * </p> 413 * 414 * <p> 415 * To intiate a layout, call {@link #requestLayout}. This method is typically 416 * called by a view on itself when it believes that is can no longer fit within 417 * its current bounds. 418 * </p> 419 * 420 * <a name="Drawing"></a> 421 * <h3>Drawing</h3> 422 * <p> 423 * Drawing is handled by walking the tree and rendering each view that 424 * intersects the the invalid region. Because the tree is traversed in-order, 425 * this means that parents will draw before (i.e., behind) their children, with 426 * siblings drawn in the order they appear in the tree. 427 * If you set a background drawable for a View, then the View will draw it for you 428 * before calling back to its <code>onDraw()</code> method. 429 * </p> 430 * 431 * <p> 432 * Note that the framework will not draw views that are not in the invalid region. 433 * </p> 434 * 435 * <p> 436 * To force a view to draw, call {@link #invalidate()}. 437 * </p> 438 * 439 * <a name="EventHandlingThreading"></a> 440 * <h3>Event Handling and Threading</h3> 441 * <p> 442 * The basic cycle of a view is as follows: 443 * <ol> 444 * <li>An event comes in and is dispatched to the appropriate view. The view 445 * handles the event and notifies any listeners.</li> 446 * <li>If in the course of processing the event, the view's bounds may need 447 * to be changed, the view will call {@link #requestLayout()}.</li> 448 * <li>Similarly, if in the course of processing the event the view's appearance 449 * may need to be changed, the view will call {@link #invalidate()}.</li> 450 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 451 * the framework will take care of measuring, laying out, and drawing the tree 452 * as appropriate.</li> 453 * </ol> 454 * </p> 455 * 456 * <p><em>Note: The entire view tree is single threaded. You must always be on 457 * the UI thread when calling any method on any view.</em> 458 * If you are doing work on other threads and want to update the state of a view 459 * from that thread, you should use a {@link Handler}. 460 * </p> 461 * 462 * <a name="FocusHandling"></a> 463 * <h3>Focus Handling</h3> 464 * <p> 465 * The framework will handle routine focus movement in response to user input. 466 * This includes changing the focus as views are removed or hidden, or as new 467 * views become available. Views indicate their willingness to take focus 468 * through the {@link #isFocusable} method. To change whether a view can take 469 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 470 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 471 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 472 * </p> 473 * <p> 474 * Focus movement is based on an algorithm which finds the nearest neighbor in a 475 * given direction. In rare cases, the default algorithm may not match the 476 * intended behavior of the developer. In these situations, you can provide 477 * explicit overrides by using these XML attributes in the layout file: 478 * <pre> 479 * nextFocusDown 480 * nextFocusLeft 481 * nextFocusRight 482 * nextFocusUp 483 * </pre> 484 * </p> 485 * 486 * 487 * <p> 488 * To get a particular view to take focus, call {@link #requestFocus()}. 489 * </p> 490 * 491 * <a name="TouchMode"></a> 492 * <h3>Touch Mode</h3> 493 * <p> 494 * When a user is navigating a user interface via directional keys such as a D-pad, it is 495 * necessary to give focus to actionable items such as buttons so the user can see 496 * what will take input. If the device has touch capabilities, however, and the user 497 * begins interacting with the interface by touching it, it is no longer necessary to 498 * always highlight, or give focus to, a particular view. This motivates a mode 499 * for interaction named 'touch mode'. 500 * </p> 501 * <p> 502 * For a touch capable device, once the user touches the screen, the device 503 * will enter touch mode. From this point onward, only views for which 504 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 505 * Other views that are touchable, like buttons, will not take focus when touched; they will 506 * only fire the on click listeners. 507 * </p> 508 * <p> 509 * Any time a user hits a directional key, such as a D-pad direction, the view device will 510 * exit touch mode, and find a view to take focus, so that the user may resume interacting 511 * with the user interface without touching the screen again. 512 * </p> 513 * <p> 514 * The touch mode state is maintained across {@link android.app.Activity}s. Call 515 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 516 * </p> 517 * 518 * <a name="Scrolling"></a> 519 * <h3>Scrolling</h3> 520 * <p> 521 * The framework provides basic support for views that wish to internally 522 * scroll their content. This includes keeping track of the X and Y scroll 523 * offset as well as mechanisms for drawing scrollbars. See 524 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 525 * {@link #awakenScrollBars()} for more details. 526 * </p> 527 * 528 * <a name="Tags"></a> 529 * <h3>Tags</h3> 530 * <p> 531 * Unlike IDs, tags are not used to identify views. Tags are essentially an 532 * extra piece of information that can be associated with a view. They are most 533 * often used as a convenience to store data related to views in the views 534 * themselves rather than by putting them in a separate structure. 535 * </p> 536 * 537 * <a name="Animation"></a> 538 * <h3>Animation</h3> 539 * <p> 540 * You can attach an {@link Animation} object to a view using 541 * {@link #setAnimation(Animation)} or 542 * {@link #startAnimation(Animation)}. The animation can alter the scale, 543 * rotation, translation and alpha of a view over time. If the animation is 544 * attached to a view that has children, the animation will affect the entire 545 * subtree rooted by that node. When an animation is started, the framework will 546 * take care of redrawing the appropriate views until the animation completes. 547 * </p> 548 * <p> 549 * Starting with Android 3.0, the preferred way of animating views is to use the 550 * {@link android.animation} package APIs. 551 * </p> 552 * 553 * <a name="Security"></a> 554 * <h3>Security</h3> 555 * <p> 556 * Sometimes it is essential that an application be able to verify that an action 557 * is being performed with the full knowledge and consent of the user, such as 558 * granting a permission request, making a purchase or clicking on an advertisement. 559 * Unfortunately, a malicious application could try to spoof the user into 560 * performing these actions, unaware, by concealing the intended purpose of the view. 561 * As a remedy, the framework offers a touch filtering mechanism that can be used to 562 * improve the security of views that provide access to sensitive functionality. 563 * </p><p> 564 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured} or set the 565 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 566 * will discard touches that are received whenever the view's window is obscured by 567 * another visible window. As a result, the view will not receive touches whenever a 568 * toast, dialog or other window appears above the view's window. 569 * </p><p> 570 * For more fine-grained control over security, consider overriding the 571 * {@link #onFilterTouchEventForSecurity} method to implement your own security policy. 572 * See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 573 * </p> 574 * 575 * @attr ref android.R.styleable#View_alpha 576 * @attr ref android.R.styleable#View_background 577 * @attr ref android.R.styleable#View_clickable 578 * @attr ref android.R.styleable#View_contentDescription 579 * @attr ref android.R.styleable#View_drawingCacheQuality 580 * @attr ref android.R.styleable#View_duplicateParentState 581 * @attr ref android.R.styleable#View_id 582 * @attr ref android.R.styleable#View_fadingEdge 583 * @attr ref android.R.styleable#View_fadingEdgeLength 584 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 585 * @attr ref android.R.styleable#View_fitsSystemWindows 586 * @attr ref android.R.styleable#View_isScrollContainer 587 * @attr ref android.R.styleable#View_focusable 588 * @attr ref android.R.styleable#View_focusableInTouchMode 589 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 590 * @attr ref android.R.styleable#View_keepScreenOn 591 * @attr ref android.R.styleable#View_layerType 592 * @attr ref android.R.styleable#View_longClickable 593 * @attr ref android.R.styleable#View_minHeight 594 * @attr ref android.R.styleable#View_minWidth 595 * @attr ref android.R.styleable#View_nextFocusDown 596 * @attr ref android.R.styleable#View_nextFocusLeft 597 * @attr ref android.R.styleable#View_nextFocusRight 598 * @attr ref android.R.styleable#View_nextFocusUp 599 * @attr ref android.R.styleable#View_onClick 600 * @attr ref android.R.styleable#View_padding 601 * @attr ref android.R.styleable#View_paddingBottom 602 * @attr ref android.R.styleable#View_paddingLeft 603 * @attr ref android.R.styleable#View_paddingRight 604 * @attr ref android.R.styleable#View_paddingTop 605 * @attr ref android.R.styleable#View_saveEnabled 606 * @attr ref android.R.styleable#View_rotation 607 * @attr ref android.R.styleable#View_rotationX 608 * @attr ref android.R.styleable#View_rotationY 609 * @attr ref android.R.styleable#View_scaleX 610 * @attr ref android.R.styleable#View_scaleY 611 * @attr ref android.R.styleable#View_scrollX 612 * @attr ref android.R.styleable#View_scrollY 613 * @attr ref android.R.styleable#View_scrollbarSize 614 * @attr ref android.R.styleable#View_scrollbarStyle 615 * @attr ref android.R.styleable#View_scrollbars 616 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 617 * @attr ref android.R.styleable#View_scrollbarFadeDuration 618 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 619 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbVertical 621 * @attr ref android.R.styleable#View_scrollbarTrackVertical 622 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 624 * @attr ref android.R.styleable#View_soundEffectsEnabled 625 * @attr ref android.R.styleable#View_tag 626 * @attr ref android.R.styleable#View_transformPivotX 627 * @attr ref android.R.styleable#View_transformPivotY 628 * @attr ref android.R.styleable#View_translationX 629 * @attr ref android.R.styleable#View_translationY 630 * @attr ref android.R.styleable#View_visibility 631 * 632 * @see android.view.ViewGroup 633 */ 634public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 635 private static final boolean DBG = false; 636 637 /** 638 * The logging tag used by this class with android.util.Log. 639 */ 640 protected static final String VIEW_LOG_TAG = "View"; 641 642 /** 643 * Used to mark a View that has no ID. 644 */ 645 public static final int NO_ID = -1; 646 647 /** 648 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 649 * calling setFlags. 650 */ 651 private static final int NOT_FOCUSABLE = 0x00000000; 652 653 /** 654 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 655 * setFlags. 656 */ 657 private static final int FOCUSABLE = 0x00000001; 658 659 /** 660 * Mask for use with setFlags indicating bits used for focus. 661 */ 662 private static final int FOCUSABLE_MASK = 0x00000001; 663 664 /** 665 * This view will adjust its padding to fit sytem windows (e.g. status bar) 666 */ 667 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 668 669 /** 670 * This view is visible. Use with {@link #setVisibility}. 671 */ 672 public static final int VISIBLE = 0x00000000; 673 674 /** 675 * This view is invisible, but it still takes up space for layout purposes. 676 * Use with {@link #setVisibility}. 677 */ 678 public static final int INVISIBLE = 0x00000004; 679 680 /** 681 * This view is invisible, and it doesn't take any space for layout 682 * purposes. Use with {@link #setVisibility}. 683 */ 684 public static final int GONE = 0x00000008; 685 686 /** 687 * Mask for use with setFlags indicating bits used for visibility. 688 * {@hide} 689 */ 690 static final int VISIBILITY_MASK = 0x0000000C; 691 692 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 693 694 /** 695 * This view is enabled. Intrepretation varies by subclass. 696 * Use with ENABLED_MASK when calling setFlags. 697 * {@hide} 698 */ 699 static final int ENABLED = 0x00000000; 700 701 /** 702 * This view is disabled. Intrepretation varies by subclass. 703 * Use with ENABLED_MASK when calling setFlags. 704 * {@hide} 705 */ 706 static final int DISABLED = 0x00000020; 707 708 /** 709 * Mask for use with setFlags indicating bits used for indicating whether 710 * this view is enabled 711 * {@hide} 712 */ 713 static final int ENABLED_MASK = 0x00000020; 714 715 /** 716 * This view won't draw. {@link #onDraw} won't be called and further 717 * optimizations 718 * will be performed. It is okay to have this flag set and a background. 719 * Use with DRAW_MASK when calling setFlags. 720 * {@hide} 721 */ 722 static final int WILL_NOT_DRAW = 0x00000080; 723 724 /** 725 * Mask for use with setFlags indicating bits used for indicating whether 726 * this view is will draw 727 * {@hide} 728 */ 729 static final int DRAW_MASK = 0x00000080; 730 731 /** 732 * <p>This view doesn't show scrollbars.</p> 733 * {@hide} 734 */ 735 static final int SCROLLBARS_NONE = 0x00000000; 736 737 /** 738 * <p>This view shows horizontal scrollbars.</p> 739 * {@hide} 740 */ 741 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 742 743 /** 744 * <p>This view shows vertical scrollbars.</p> 745 * {@hide} 746 */ 747 static final int SCROLLBARS_VERTICAL = 0x00000200; 748 749 /** 750 * <p>Mask for use with setFlags indicating bits used for indicating which 751 * scrollbars are enabled.</p> 752 * {@hide} 753 */ 754 static final int SCROLLBARS_MASK = 0x00000300; 755 756 /** 757 * Indicates that the view should filter touches when its window is obscured. 758 * Refer to the class comments for more information about this security feature. 759 * {@hide} 760 */ 761 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 762 763 // note flag value 0x00000800 is now available for next flags... 764 765 /** 766 * <p>This view doesn't show fading edges.</p> 767 * {@hide} 768 */ 769 static final int FADING_EDGE_NONE = 0x00000000; 770 771 /** 772 * <p>This view shows horizontal fading edges.</p> 773 * {@hide} 774 */ 775 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 776 777 /** 778 * <p>This view shows vertical fading edges.</p> 779 * {@hide} 780 */ 781 static final int FADING_EDGE_VERTICAL = 0x00002000; 782 783 /** 784 * <p>Mask for use with setFlags indicating bits used for indicating which 785 * fading edges are enabled.</p> 786 * {@hide} 787 */ 788 static final int FADING_EDGE_MASK = 0x00003000; 789 790 /** 791 * <p>Indicates this view can be clicked. When clickable, a View reacts 792 * to clicks by notifying the OnClickListener.<p> 793 * {@hide} 794 */ 795 static final int CLICKABLE = 0x00004000; 796 797 /** 798 * <p>Indicates this view is caching its drawing into a bitmap.</p> 799 * {@hide} 800 */ 801 static final int DRAWING_CACHE_ENABLED = 0x00008000; 802 803 /** 804 * <p>Indicates that no icicle should be saved for this view.<p> 805 * {@hide} 806 */ 807 static final int SAVE_DISABLED = 0x000010000; 808 809 /** 810 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 811 * property.</p> 812 * {@hide} 813 */ 814 static final int SAVE_DISABLED_MASK = 0x000010000; 815 816 /** 817 * <p>Indicates that no drawing cache should ever be created for this view.<p> 818 * {@hide} 819 */ 820 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 821 822 /** 823 * <p>Indicates this view can take / keep focus when int touch mode.</p> 824 * {@hide} 825 */ 826 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 827 828 /** 829 * <p>Enables low quality mode for the drawing cache.</p> 830 */ 831 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 832 833 /** 834 * <p>Enables high quality mode for the drawing cache.</p> 835 */ 836 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 837 838 /** 839 * <p>Enables automatic quality mode for the drawing cache.</p> 840 */ 841 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 842 843 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 844 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 845 }; 846 847 /** 848 * <p>Mask for use with setFlags indicating bits used for the cache 849 * quality property.</p> 850 * {@hide} 851 */ 852 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 853 854 /** 855 * <p> 856 * Indicates this view can be long clicked. When long clickable, a View 857 * reacts to long clicks by notifying the OnLongClickListener or showing a 858 * context menu. 859 * </p> 860 * {@hide} 861 */ 862 static final int LONG_CLICKABLE = 0x00200000; 863 864 /** 865 * <p>Indicates that this view gets its drawable states from its direct parent 866 * and ignores its original internal states.</p> 867 * 868 * @hide 869 */ 870 static final int DUPLICATE_PARENT_STATE = 0x00400000; 871 872 /** 873 * The scrollbar style to display the scrollbars inside the content area, 874 * without increasing the padding. The scrollbars will be overlaid with 875 * translucency on the view's content. 876 */ 877 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 878 879 /** 880 * The scrollbar style to display the scrollbars inside the padded area, 881 * increasing the padding of the view. The scrollbars will not overlap the 882 * content area of the view. 883 */ 884 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 885 886 /** 887 * The scrollbar style to display the scrollbars at the edge of the view, 888 * without increasing the padding. The scrollbars will be overlaid with 889 * translucency. 890 */ 891 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 892 893 /** 894 * The scrollbar style to display the scrollbars at the edge of the view, 895 * increasing the padding of the view. The scrollbars will only overlap the 896 * background, if any. 897 */ 898 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 899 900 /** 901 * Mask to check if the scrollbar style is overlay or inset. 902 * {@hide} 903 */ 904 static final int SCROLLBARS_INSET_MASK = 0x01000000; 905 906 /** 907 * Mask to check if the scrollbar style is inside or outside. 908 * {@hide} 909 */ 910 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 911 912 /** 913 * Mask for scrollbar style. 914 * {@hide} 915 */ 916 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 917 918 /** 919 * View flag indicating that the screen should remain on while the 920 * window containing this view is visible to the user. This effectively 921 * takes care of automatically setting the WindowManager's 922 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 923 */ 924 public static final int KEEP_SCREEN_ON = 0x04000000; 925 926 /** 927 * View flag indicating whether this view should have sound effects enabled 928 * for events such as clicking and touching. 929 */ 930 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 931 932 /** 933 * View flag indicating whether this view should have haptic feedback 934 * enabled for events such as long presses. 935 */ 936 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 937 938 /** 939 * <p>Indicates that the view hierarchy should stop saving state when 940 * it reaches this view. If state saving is initiated immediately at 941 * the view, it will be allowed. 942 * {@hide} 943 */ 944 static final int PARENT_SAVE_DISABLED = 0x20000000; 945 946 /** 947 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 948 * {@hide} 949 */ 950 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 951 952 /** 953 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 954 * should add all focusable Views regardless if they are focusable in touch mode. 955 */ 956 public static final int FOCUSABLES_ALL = 0x00000000; 957 958 /** 959 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 960 * should add only Views focusable in touch mode. 961 */ 962 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 963 964 /** 965 * Use with {@link #focusSearch}. Move focus to the previous selectable 966 * item. 967 */ 968 public static final int FOCUS_BACKWARD = 0x00000001; 969 970 /** 971 * Use with {@link #focusSearch}. Move focus to the next selectable 972 * item. 973 */ 974 public static final int FOCUS_FORWARD = 0x00000002; 975 976 /** 977 * Use with {@link #focusSearch}. Move focus to the left. 978 */ 979 public static final int FOCUS_LEFT = 0x00000011; 980 981 /** 982 * Use with {@link #focusSearch}. Move focus up. 983 */ 984 public static final int FOCUS_UP = 0x00000021; 985 986 /** 987 * Use with {@link #focusSearch}. Move focus to the right. 988 */ 989 public static final int FOCUS_RIGHT = 0x00000042; 990 991 /** 992 * Use with {@link #focusSearch}. Move focus down. 993 */ 994 public static final int FOCUS_DOWN = 0x00000082; 995 996 /** 997 * Bits of {@link #getMeasuredWidthAndState()} and 998 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 999 */ 1000 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1001 1002 /** 1003 * Bits of {@link #getMeasuredWidthAndState()} and 1004 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1005 */ 1006 public static final int MEASURED_STATE_MASK = 0xff000000; 1007 1008 /** 1009 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1010 * for functions that combine both width and height into a single int, 1011 * such as {@link #getMeasuredState()} and the childState argument of 1012 * {@link #resolveSizeAndState(int, int, int)}. 1013 */ 1014 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1015 1016 /** 1017 * Bit of {@link #getMeasuredWidthAndState()} and 1018 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1019 * is smaller that the space the view would like to have. 1020 */ 1021 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1022 1023 /** 1024 * Base View state sets 1025 */ 1026 // Singles 1027 /** 1028 * Indicates the view has no states set. States are used with 1029 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1030 * view depending on its state. 1031 * 1032 * @see android.graphics.drawable.Drawable 1033 * @see #getDrawableState() 1034 */ 1035 protected static final int[] EMPTY_STATE_SET; 1036 /** 1037 * Indicates the view is enabled. States are used with 1038 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1039 * view depending on its state. 1040 * 1041 * @see android.graphics.drawable.Drawable 1042 * @see #getDrawableState() 1043 */ 1044 protected static final int[] ENABLED_STATE_SET; 1045 /** 1046 * Indicates the view is focused. States are used with 1047 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1048 * view depending on its state. 1049 * 1050 * @see android.graphics.drawable.Drawable 1051 * @see #getDrawableState() 1052 */ 1053 protected static final int[] FOCUSED_STATE_SET; 1054 /** 1055 * Indicates the view is selected. States are used with 1056 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1057 * view depending on its state. 1058 * 1059 * @see android.graphics.drawable.Drawable 1060 * @see #getDrawableState() 1061 */ 1062 protected static final int[] SELECTED_STATE_SET; 1063 /** 1064 * Indicates the view is pressed. States are used with 1065 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1066 * view depending on its state. 1067 * 1068 * @see android.graphics.drawable.Drawable 1069 * @see #getDrawableState() 1070 * @hide 1071 */ 1072 protected static final int[] PRESSED_STATE_SET; 1073 /** 1074 * Indicates the view's window has focus. States are used with 1075 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1076 * view depending on its state. 1077 * 1078 * @see android.graphics.drawable.Drawable 1079 * @see #getDrawableState() 1080 */ 1081 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1082 // Doubles 1083 /** 1084 * Indicates the view is enabled and has the focus. 1085 * 1086 * @see #ENABLED_STATE_SET 1087 * @see #FOCUSED_STATE_SET 1088 */ 1089 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1090 /** 1091 * Indicates the view is enabled and selected. 1092 * 1093 * @see #ENABLED_STATE_SET 1094 * @see #SELECTED_STATE_SET 1095 */ 1096 protected static final int[] ENABLED_SELECTED_STATE_SET; 1097 /** 1098 * Indicates the view is enabled and that its window has focus. 1099 * 1100 * @see #ENABLED_STATE_SET 1101 * @see #WINDOW_FOCUSED_STATE_SET 1102 */ 1103 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1104 /** 1105 * Indicates the view is focused and selected. 1106 * 1107 * @see #FOCUSED_STATE_SET 1108 * @see #SELECTED_STATE_SET 1109 */ 1110 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1111 /** 1112 * Indicates the view has the focus and that its window has the focus. 1113 * 1114 * @see #FOCUSED_STATE_SET 1115 * @see #WINDOW_FOCUSED_STATE_SET 1116 */ 1117 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1118 /** 1119 * Indicates the view is selected and that its window has the focus. 1120 * 1121 * @see #SELECTED_STATE_SET 1122 * @see #WINDOW_FOCUSED_STATE_SET 1123 */ 1124 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1125 // Triples 1126 /** 1127 * Indicates the view is enabled, focused and selected. 1128 * 1129 * @see #ENABLED_STATE_SET 1130 * @see #FOCUSED_STATE_SET 1131 * @see #SELECTED_STATE_SET 1132 */ 1133 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1134 /** 1135 * Indicates the view is enabled, focused and its window has the focus. 1136 * 1137 * @see #ENABLED_STATE_SET 1138 * @see #FOCUSED_STATE_SET 1139 * @see #WINDOW_FOCUSED_STATE_SET 1140 */ 1141 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1142 /** 1143 * Indicates the view is enabled, selected and its window has the focus. 1144 * 1145 * @see #ENABLED_STATE_SET 1146 * @see #SELECTED_STATE_SET 1147 * @see #WINDOW_FOCUSED_STATE_SET 1148 */ 1149 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1150 /** 1151 * Indicates the view is focused, selected and its window has the focus. 1152 * 1153 * @see #FOCUSED_STATE_SET 1154 * @see #SELECTED_STATE_SET 1155 * @see #WINDOW_FOCUSED_STATE_SET 1156 */ 1157 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1158 /** 1159 * Indicates the view is enabled, focused, selected and its window 1160 * has the focus. 1161 * 1162 * @see #ENABLED_STATE_SET 1163 * @see #FOCUSED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 * @see #WINDOW_FOCUSED_STATE_SET 1166 */ 1167 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1168 /** 1169 * Indicates the view is pressed and its window has the focus. 1170 * 1171 * @see #PRESSED_STATE_SET 1172 * @see #WINDOW_FOCUSED_STATE_SET 1173 */ 1174 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1175 /** 1176 * Indicates the view is pressed and selected. 1177 * 1178 * @see #PRESSED_STATE_SET 1179 * @see #SELECTED_STATE_SET 1180 */ 1181 protected static final int[] PRESSED_SELECTED_STATE_SET; 1182 /** 1183 * Indicates the view is pressed, selected and its window has the focus. 1184 * 1185 * @see #PRESSED_STATE_SET 1186 * @see #SELECTED_STATE_SET 1187 * @see #WINDOW_FOCUSED_STATE_SET 1188 */ 1189 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1190 /** 1191 * Indicates the view is pressed and focused. 1192 * 1193 * @see #PRESSED_STATE_SET 1194 * @see #FOCUSED_STATE_SET 1195 */ 1196 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1197 /** 1198 * Indicates the view is pressed, focused and its window has the focus. 1199 * 1200 * @see #PRESSED_STATE_SET 1201 * @see #FOCUSED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is pressed, focused and selected. 1207 * 1208 * @see #PRESSED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1213 /** 1214 * Indicates the view is pressed, focused, selected and its window has the focus. 1215 * 1216 * @see #PRESSED_STATE_SET 1217 * @see #FOCUSED_STATE_SET 1218 * @see #SELECTED_STATE_SET 1219 * @see #WINDOW_FOCUSED_STATE_SET 1220 */ 1221 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1222 /** 1223 * Indicates the view is pressed and enabled. 1224 * 1225 * @see #PRESSED_STATE_SET 1226 * @see #ENABLED_STATE_SET 1227 */ 1228 protected static final int[] PRESSED_ENABLED_STATE_SET; 1229 /** 1230 * Indicates the view is pressed, enabled and its window has the focus. 1231 * 1232 * @see #PRESSED_STATE_SET 1233 * @see #ENABLED_STATE_SET 1234 * @see #WINDOW_FOCUSED_STATE_SET 1235 */ 1236 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1237 /** 1238 * Indicates the view is pressed, enabled and selected. 1239 * 1240 * @see #PRESSED_STATE_SET 1241 * @see #ENABLED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed, enabled, selected and its window has the 1247 * focus. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #ENABLED_STATE_SET 1251 * @see #SELECTED_STATE_SET 1252 * @see #WINDOW_FOCUSED_STATE_SET 1253 */ 1254 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1255 /** 1256 * Indicates the view is pressed, enabled and focused. 1257 * 1258 * @see #PRESSED_STATE_SET 1259 * @see #ENABLED_STATE_SET 1260 * @see #FOCUSED_STATE_SET 1261 */ 1262 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1263 /** 1264 * Indicates the view is pressed, enabled, focused and its window has the 1265 * focus. 1266 * 1267 * @see #PRESSED_STATE_SET 1268 * @see #ENABLED_STATE_SET 1269 * @see #FOCUSED_STATE_SET 1270 * @see #WINDOW_FOCUSED_STATE_SET 1271 */ 1272 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1273 /** 1274 * Indicates the view is pressed, enabled, focused and selected. 1275 * 1276 * @see #PRESSED_STATE_SET 1277 * @see #ENABLED_STATE_SET 1278 * @see #SELECTED_STATE_SET 1279 * @see #FOCUSED_STATE_SET 1280 */ 1281 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1282 /** 1283 * Indicates the view is pressed, enabled, focused, selected and its window 1284 * has the focus. 1285 * 1286 * @see #PRESSED_STATE_SET 1287 * @see #ENABLED_STATE_SET 1288 * @see #SELECTED_STATE_SET 1289 * @see #FOCUSED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1293 1294 /** 1295 * The order here is very important to {@link #getDrawableState()} 1296 */ 1297 private static final int[][] VIEW_STATE_SETS; 1298 1299 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1300 static final int VIEW_STATE_SELECTED = 1 << 1; 1301 static final int VIEW_STATE_FOCUSED = 1 << 2; 1302 static final int VIEW_STATE_ENABLED = 1 << 3; 1303 static final int VIEW_STATE_PRESSED = 1 << 4; 1304 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1305 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1306 1307 static final int[] VIEW_STATE_IDS = new int[] { 1308 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1309 R.attr.state_selected, VIEW_STATE_SELECTED, 1310 R.attr.state_focused, VIEW_STATE_FOCUSED, 1311 R.attr.state_enabled, VIEW_STATE_ENABLED, 1312 R.attr.state_pressed, VIEW_STATE_PRESSED, 1313 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1314 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1315 }; 1316 1317 static { 1318 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1319 throw new IllegalStateException( 1320 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1321 } 1322 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1323 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1324 int viewState = R.styleable.ViewDrawableStates[i]; 1325 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1326 if (VIEW_STATE_IDS[j] == viewState) { 1327 orderedIds[i * 2] = viewState; 1328 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1329 } 1330 } 1331 } 1332 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1333 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1334 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1335 int numBits = Integer.bitCount(i); 1336 int[] set = new int[numBits]; 1337 int pos = 0; 1338 for (int j = 0; j < orderedIds.length; j += 2) { 1339 if ((i & orderedIds[j+1]) != 0) { 1340 set[pos++] = orderedIds[j]; 1341 } 1342 } 1343 VIEW_STATE_SETS[i] = set; 1344 } 1345 1346 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1347 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1348 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1349 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1350 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1351 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1352 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1353 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1354 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1355 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1356 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1357 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1358 | VIEW_STATE_FOCUSED]; 1359 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1360 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1361 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1362 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1363 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1364 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1365 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1366 | VIEW_STATE_ENABLED]; 1367 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1368 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1369 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1370 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1371 | VIEW_STATE_ENABLED]; 1372 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1373 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1374 | VIEW_STATE_ENABLED]; 1375 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1376 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1377 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1378 1379 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1380 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1381 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1382 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1383 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1384 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1385 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1386 | VIEW_STATE_PRESSED]; 1387 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1388 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1389 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1390 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1391 | VIEW_STATE_PRESSED]; 1392 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1393 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1394 | VIEW_STATE_PRESSED]; 1395 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1396 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1397 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1398 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1399 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1400 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1401 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1402 | VIEW_STATE_PRESSED]; 1403 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1404 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1405 | VIEW_STATE_PRESSED]; 1406 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1407 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1408 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1409 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1410 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1411 | VIEW_STATE_PRESSED]; 1412 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1413 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1414 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1415 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1417 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1418 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1421 | VIEW_STATE_PRESSED]; 1422 } 1423 1424 /** 1425 * Used by views that contain lists of items. This state indicates that 1426 * the view is showing the last item. 1427 * @hide 1428 */ 1429 protected static final int[] LAST_STATE_SET = {R.attr.state_last}; 1430 /** 1431 * Used by views that contain lists of items. This state indicates that 1432 * the view is showing the first item. 1433 * @hide 1434 */ 1435 protected static final int[] FIRST_STATE_SET = {R.attr.state_first}; 1436 /** 1437 * Used by views that contain lists of items. This state indicates that 1438 * the view is showing the middle item. 1439 * @hide 1440 */ 1441 protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle}; 1442 /** 1443 * Used by views that contain lists of items. This state indicates that 1444 * the view is showing only one item. 1445 * @hide 1446 */ 1447 protected static final int[] SINGLE_STATE_SET = {R.attr.state_single}; 1448 /** 1449 * Used by views that contain lists of items. This state indicates that 1450 * the view is pressed and showing the last item. 1451 * @hide 1452 */ 1453 protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed}; 1454 /** 1455 * Used by views that contain lists of items. This state indicates that 1456 * the view is pressed and showing the first item. 1457 * @hide 1458 */ 1459 protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed}; 1460 /** 1461 * Used by views that contain lists of items. This state indicates that 1462 * the view is pressed and showing the middle item. 1463 * @hide 1464 */ 1465 protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed}; 1466 /** 1467 * Used by views that contain lists of items. This state indicates that 1468 * the view is pressed and showing only one item. 1469 * @hide 1470 */ 1471 protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed}; 1472 1473 /** 1474 * Temporary Rect currently for use in setBackground(). This will probably 1475 * be extended in the future to hold our own class with more than just 1476 * a Rect. :) 1477 */ 1478 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1479 1480 /** 1481 * Map used to store views' tags. 1482 */ 1483 private static WeakHashMap<View, SparseArray<Object>> sTags; 1484 1485 /** 1486 * Lock used to access sTags. 1487 */ 1488 private static final Object sTagsLock = new Object(); 1489 1490 /** 1491 * The animation currently associated with this view. 1492 * @hide 1493 */ 1494 protected Animation mCurrentAnimation = null; 1495 1496 /** 1497 * Width as measured during measure pass. 1498 * {@hide} 1499 */ 1500 @ViewDebug.ExportedProperty(category = "measurement") 1501 /*package*/ int mMeasuredWidth; 1502 1503 /** 1504 * Height as measured during measure pass. 1505 * {@hide} 1506 */ 1507 @ViewDebug.ExportedProperty(category = "measurement") 1508 /*package*/ int mMeasuredHeight; 1509 1510 /** 1511 * The view's identifier. 1512 * {@hide} 1513 * 1514 * @see #setId(int) 1515 * @see #getId() 1516 */ 1517 @ViewDebug.ExportedProperty(resolveId = true) 1518 int mID = NO_ID; 1519 1520 /** 1521 * The view's tag. 1522 * {@hide} 1523 * 1524 * @see #setTag(Object) 1525 * @see #getTag() 1526 */ 1527 protected Object mTag; 1528 1529 // for mPrivateFlags: 1530 /** {@hide} */ 1531 static final int WANTS_FOCUS = 0x00000001; 1532 /** {@hide} */ 1533 static final int FOCUSED = 0x00000002; 1534 /** {@hide} */ 1535 static final int SELECTED = 0x00000004; 1536 /** {@hide} */ 1537 static final int IS_ROOT_NAMESPACE = 0x00000008; 1538 /** {@hide} */ 1539 static final int HAS_BOUNDS = 0x00000010; 1540 /** {@hide} */ 1541 static final int DRAWN = 0x00000020; 1542 /** 1543 * When this flag is set, this view is running an animation on behalf of its 1544 * children and should therefore not cancel invalidate requests, even if they 1545 * lie outside of this view's bounds. 1546 * 1547 * {@hide} 1548 */ 1549 static final int DRAW_ANIMATION = 0x00000040; 1550 /** {@hide} */ 1551 static final int SKIP_DRAW = 0x00000080; 1552 /** {@hide} */ 1553 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1554 /** {@hide} */ 1555 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1556 /** {@hide} */ 1557 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1558 /** {@hide} */ 1559 static final int MEASURED_DIMENSION_SET = 0x00000800; 1560 /** {@hide} */ 1561 static final int FORCE_LAYOUT = 0x00001000; 1562 /** {@hide} */ 1563 static final int LAYOUT_REQUIRED = 0x00002000; 1564 1565 private static final int PRESSED = 0x00004000; 1566 1567 /** {@hide} */ 1568 static final int DRAWING_CACHE_VALID = 0x00008000; 1569 /** 1570 * Flag used to indicate that this view should be drawn once more (and only once 1571 * more) after its animation has completed. 1572 * {@hide} 1573 */ 1574 static final int ANIMATION_STARTED = 0x00010000; 1575 1576 private static final int SAVE_STATE_CALLED = 0x00020000; 1577 1578 /** 1579 * Indicates that the View returned true when onSetAlpha() was called and that 1580 * the alpha must be restored. 1581 * {@hide} 1582 */ 1583 static final int ALPHA_SET = 0x00040000; 1584 1585 /** 1586 * Set by {@link #setScrollContainer(boolean)}. 1587 */ 1588 static final int SCROLL_CONTAINER = 0x00080000; 1589 1590 /** 1591 * Set by {@link #setScrollContainer(boolean)}. 1592 */ 1593 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1594 1595 /** 1596 * View flag indicating whether this view was invalidated (fully or partially.) 1597 * 1598 * @hide 1599 */ 1600 static final int DIRTY = 0x00200000; 1601 1602 /** 1603 * View flag indicating whether this view was invalidated by an opaque 1604 * invalidate request. 1605 * 1606 * @hide 1607 */ 1608 static final int DIRTY_OPAQUE = 0x00400000; 1609 1610 /** 1611 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1612 * 1613 * @hide 1614 */ 1615 static final int DIRTY_MASK = 0x00600000; 1616 1617 /** 1618 * Indicates whether the background is opaque. 1619 * 1620 * @hide 1621 */ 1622 static final int OPAQUE_BACKGROUND = 0x00800000; 1623 1624 /** 1625 * Indicates whether the scrollbars are opaque. 1626 * 1627 * @hide 1628 */ 1629 static final int OPAQUE_SCROLLBARS = 0x01000000; 1630 1631 /** 1632 * Indicates whether the view is opaque. 1633 * 1634 * @hide 1635 */ 1636 static final int OPAQUE_MASK = 0x01800000; 1637 1638 /** 1639 * Indicates a prepressed state; 1640 * the short time between ACTION_DOWN and recognizing 1641 * a 'real' press. Prepressed is used to recognize quick taps 1642 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1643 * 1644 * @hide 1645 */ 1646 private static final int PREPRESSED = 0x02000000; 1647 1648 /** 1649 * Indicates whether the view is temporarily detached. 1650 * 1651 * @hide 1652 */ 1653 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1654 1655 /** 1656 * Indicates that we should awaken scroll bars once attached 1657 * 1658 * @hide 1659 */ 1660 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1661 1662 /** 1663 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1664 * for transform operations 1665 * 1666 * @hide 1667 */ 1668 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1669 1670 /** {@hide} */ 1671 static final int ACTIVATED = 0x40000000; 1672 1673 /** 1674 * Always allow a user to over-scroll this view, provided it is a 1675 * view that can scroll. 1676 * 1677 * @see #getOverScrollMode() 1678 * @see #setOverScrollMode(int) 1679 */ 1680 public static final int OVER_SCROLL_ALWAYS = 0; 1681 1682 /** 1683 * Allow a user to over-scroll this view only if the content is large 1684 * enough to meaningfully scroll, provided it is a view that can scroll. 1685 * 1686 * @see #getOverScrollMode() 1687 * @see #setOverScrollMode(int) 1688 */ 1689 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1690 1691 /** 1692 * Never allow a user to over-scroll this view. 1693 * 1694 * @see #getOverScrollMode() 1695 * @see #setOverScrollMode(int) 1696 */ 1697 public static final int OVER_SCROLL_NEVER = 2; 1698 1699 /** 1700 * Controls the over-scroll mode for this view. 1701 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1702 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1703 * and {@link #OVER_SCROLL_NEVER}. 1704 */ 1705 private int mOverScrollMode; 1706 1707 /** 1708 * The parent this view is attached to. 1709 * {@hide} 1710 * 1711 * @see #getParent() 1712 */ 1713 protected ViewParent mParent; 1714 1715 /** 1716 * {@hide} 1717 */ 1718 AttachInfo mAttachInfo; 1719 1720 /** 1721 * {@hide} 1722 */ 1723 @ViewDebug.ExportedProperty(flagMapping = { 1724 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1725 name = "FORCE_LAYOUT"), 1726 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1727 name = "LAYOUT_REQUIRED"), 1728 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1729 name = "DRAWING_CACHE_INVALID", outputIf = false), 1730 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1731 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1732 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1733 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1734 }) 1735 int mPrivateFlags; 1736 1737 /** 1738 * Count of how many windows this view has been attached to. 1739 */ 1740 int mWindowAttachCount; 1741 1742 /** 1743 * The layout parameters associated with this view and used by the parent 1744 * {@link android.view.ViewGroup} to determine how this view should be 1745 * laid out. 1746 * {@hide} 1747 */ 1748 protected ViewGroup.LayoutParams mLayoutParams; 1749 1750 /** 1751 * The view flags hold various views states. 1752 * {@hide} 1753 */ 1754 @ViewDebug.ExportedProperty 1755 int mViewFlags; 1756 1757 /** 1758 * The transform matrix for the View. This transform is calculated internally 1759 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1760 * is used by default. Do *not* use this variable directly; instead call 1761 * getMatrix(), which will automatically recalculate the matrix if necessary 1762 * to get the correct matrix based on the latest rotation and scale properties. 1763 */ 1764 private final Matrix mMatrix = new Matrix(); 1765 1766 /** 1767 * The transform matrix for the View. This transform is calculated internally 1768 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1769 * is used by default. Do *not* use this variable directly; instead call 1770 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1771 * to get the correct matrix based on the latest rotation and scale properties. 1772 */ 1773 private Matrix mInverseMatrix; 1774 1775 /** 1776 * An internal variable that tracks whether we need to recalculate the 1777 * transform matrix, based on whether the rotation or scaleX/Y properties 1778 * have changed since the matrix was last calculated. 1779 */ 1780 private boolean mMatrixDirty = false; 1781 1782 /** 1783 * An internal variable that tracks whether we need to recalculate the 1784 * transform matrix, based on whether the rotation or scaleX/Y properties 1785 * have changed since the matrix was last calculated. 1786 */ 1787 private boolean mInverseMatrixDirty = true; 1788 1789 /** 1790 * A variable that tracks whether we need to recalculate the 1791 * transform matrix, based on whether the rotation or scaleX/Y properties 1792 * have changed since the matrix was last calculated. This variable 1793 * is only valid after a call to updateMatrix() or to a function that 1794 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1795 */ 1796 private boolean mMatrixIsIdentity = true; 1797 1798 /** 1799 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1800 */ 1801 private Camera mCamera = null; 1802 1803 /** 1804 * This matrix is used when computing the matrix for 3D rotations. 1805 */ 1806 private Matrix matrix3D = null; 1807 1808 /** 1809 * These prev values are used to recalculate a centered pivot point when necessary. The 1810 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1811 * set), so thes values are only used then as well. 1812 */ 1813 private int mPrevWidth = -1; 1814 private int mPrevHeight = -1; 1815 1816 /** 1817 * Convenience value to check for float values that are close enough to zero to be considered 1818 * zero. 1819 */ 1820 private static final float NONZERO_EPSILON = .001f; 1821 1822 /** 1823 * The degrees rotation around the vertical axis through the pivot point. 1824 */ 1825 @ViewDebug.ExportedProperty 1826 private float mRotationY = 0f; 1827 1828 /** 1829 * The degrees rotation around the horizontal axis through the pivot point. 1830 */ 1831 @ViewDebug.ExportedProperty 1832 private float mRotationX = 0f; 1833 1834 /** 1835 * The degrees rotation around the pivot point. 1836 */ 1837 @ViewDebug.ExportedProperty 1838 private float mRotation = 0f; 1839 1840 /** 1841 * The amount of translation of the object away from its left property (post-layout). 1842 */ 1843 @ViewDebug.ExportedProperty 1844 private float mTranslationX = 0f; 1845 1846 /** 1847 * The amount of translation of the object away from its top property (post-layout). 1848 */ 1849 @ViewDebug.ExportedProperty 1850 private float mTranslationY = 0f; 1851 1852 /** 1853 * The amount of scale in the x direction around the pivot point. A 1854 * value of 1 means no scaling is applied. 1855 */ 1856 @ViewDebug.ExportedProperty 1857 private float mScaleX = 1f; 1858 1859 /** 1860 * The amount of scale in the y direction around the pivot point. A 1861 * value of 1 means no scaling is applied. 1862 */ 1863 @ViewDebug.ExportedProperty 1864 private float mScaleY = 1f; 1865 1866 /** 1867 * The amount of scale in the x direction around the pivot point. A 1868 * value of 1 means no scaling is applied. 1869 */ 1870 @ViewDebug.ExportedProperty 1871 private float mPivotX = 0f; 1872 1873 /** 1874 * The amount of scale in the y direction around the pivot point. A 1875 * value of 1 means no scaling is applied. 1876 */ 1877 @ViewDebug.ExportedProperty 1878 private float mPivotY = 0f; 1879 1880 /** 1881 * The opacity of the View. This is a value from 0 to 1, where 0 means 1882 * completely transparent and 1 means completely opaque. 1883 */ 1884 @ViewDebug.ExportedProperty 1885 private float mAlpha = 1f; 1886 1887 /** 1888 * The distance in pixels from the left edge of this view's parent 1889 * to the left edge of this view. 1890 * {@hide} 1891 */ 1892 @ViewDebug.ExportedProperty(category = "layout") 1893 protected int mLeft; 1894 /** 1895 * The distance in pixels from the left edge of this view's parent 1896 * to the right edge of this view. 1897 * {@hide} 1898 */ 1899 @ViewDebug.ExportedProperty(category = "layout") 1900 protected int mRight; 1901 /** 1902 * The distance in pixels from the top edge of this view's parent 1903 * to the top edge of this view. 1904 * {@hide} 1905 */ 1906 @ViewDebug.ExportedProperty(category = "layout") 1907 protected int mTop; 1908 /** 1909 * The distance in pixels from the top edge of this view's parent 1910 * to the bottom edge of this view. 1911 * {@hide} 1912 */ 1913 @ViewDebug.ExportedProperty(category = "layout") 1914 protected int mBottom; 1915 1916 /** 1917 * The offset, in pixels, by which the content of this view is scrolled 1918 * horizontally. 1919 * {@hide} 1920 */ 1921 @ViewDebug.ExportedProperty(category = "scrolling") 1922 protected int mScrollX; 1923 /** 1924 * The offset, in pixels, by which the content of this view is scrolled 1925 * vertically. 1926 * {@hide} 1927 */ 1928 @ViewDebug.ExportedProperty(category = "scrolling") 1929 protected int mScrollY; 1930 1931 /** 1932 * The left padding in pixels, that is the distance in pixels between the 1933 * left edge of this view and the left edge of its content. 1934 * {@hide} 1935 */ 1936 @ViewDebug.ExportedProperty(category = "padding") 1937 protected int mPaddingLeft; 1938 /** 1939 * The right padding in pixels, that is the distance in pixels between the 1940 * right edge of this view and the right edge of its content. 1941 * {@hide} 1942 */ 1943 @ViewDebug.ExportedProperty(category = "padding") 1944 protected int mPaddingRight; 1945 /** 1946 * The top padding in pixels, that is the distance in pixels between the 1947 * top edge of this view and the top edge of its content. 1948 * {@hide} 1949 */ 1950 @ViewDebug.ExportedProperty(category = "padding") 1951 protected int mPaddingTop; 1952 /** 1953 * The bottom padding in pixels, that is the distance in pixels between the 1954 * bottom edge of this view and the bottom edge of its content. 1955 * {@hide} 1956 */ 1957 @ViewDebug.ExportedProperty(category = "padding") 1958 protected int mPaddingBottom; 1959 1960 /** 1961 * Briefly describes the view and is primarily used for accessibility support. 1962 */ 1963 private CharSequence mContentDescription; 1964 1965 /** 1966 * Cache the paddingRight set by the user to append to the scrollbar's size. 1967 */ 1968 @ViewDebug.ExportedProperty(category = "padding") 1969 int mUserPaddingRight; 1970 1971 /** 1972 * Cache the paddingBottom set by the user to append to the scrollbar's size. 1973 */ 1974 @ViewDebug.ExportedProperty(category = "padding") 1975 int mUserPaddingBottom; 1976 1977 /** 1978 * Cache the paddingLeft set by the user to append to the scrollbar's size. 1979 */ 1980 @ViewDebug.ExportedProperty(category = "padding") 1981 int mUserPaddingLeft; 1982 1983 /** 1984 * @hide 1985 */ 1986 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 1987 /** 1988 * @hide 1989 */ 1990 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 1991 1992 private Resources mResources = null; 1993 1994 private Drawable mBGDrawable; 1995 1996 private int mBackgroundResource; 1997 private boolean mBackgroundSizeChanged; 1998 1999 /** 2000 * Listener used to dispatch focus change events. 2001 * This field should be made private, so it is hidden from the SDK. 2002 * {@hide} 2003 */ 2004 protected OnFocusChangeListener mOnFocusChangeListener; 2005 2006 /** 2007 * Listeners for layout change events. 2008 */ 2009 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2010 2011 /** 2012 * Listener used to dispatch click events. 2013 * This field should be made private, so it is hidden from the SDK. 2014 * {@hide} 2015 */ 2016 protected OnClickListener mOnClickListener; 2017 2018 /** 2019 * Listener used to dispatch long click events. 2020 * This field should be made private, so it is hidden from the SDK. 2021 * {@hide} 2022 */ 2023 protected OnLongClickListener mOnLongClickListener; 2024 2025 /** 2026 * Listener used to build the context menu. 2027 * This field should be made private, so it is hidden from the SDK. 2028 * {@hide} 2029 */ 2030 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2031 2032 private OnKeyListener mOnKeyListener; 2033 2034 private OnTouchListener mOnTouchListener; 2035 2036 private OnDragListener mOnDragListener; 2037 2038 /** 2039 * The application environment this view lives in. 2040 * This field should be made private, so it is hidden from the SDK. 2041 * {@hide} 2042 */ 2043 protected Context mContext; 2044 2045 private ScrollabilityCache mScrollCache; 2046 2047 private int[] mDrawableState = null; 2048 2049 private Bitmap mDrawingCache; 2050 private Bitmap mUnscaledDrawingCache; 2051 private DisplayList mDisplayList; 2052 private HardwareLayer mHardwareLayer; 2053 2054 /** 2055 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2056 * the user may specify which view to go to next. 2057 */ 2058 private int mNextFocusLeftId = View.NO_ID; 2059 2060 /** 2061 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2062 * the user may specify which view to go to next. 2063 */ 2064 private int mNextFocusRightId = View.NO_ID; 2065 2066 /** 2067 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2068 * the user may specify which view to go to next. 2069 */ 2070 private int mNextFocusUpId = View.NO_ID; 2071 2072 /** 2073 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2074 * the user may specify which view to go to next. 2075 */ 2076 private int mNextFocusDownId = View.NO_ID; 2077 2078 /** 2079 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2080 * the user may specify which view to go to next. 2081 */ 2082 int mNextFocusForwardId = View.NO_ID; 2083 2084 private CheckForLongPress mPendingCheckForLongPress; 2085 private CheckForTap mPendingCheckForTap = null; 2086 private PerformClick mPerformClick; 2087 2088 private UnsetPressedState mUnsetPressedState; 2089 2090 /** 2091 * Whether the long press's action has been invoked. The tap's action is invoked on the 2092 * up event while a long press is invoked as soon as the long press duration is reached, so 2093 * a long press could be performed before the tap is checked, in which case the tap's action 2094 * should not be invoked. 2095 */ 2096 private boolean mHasPerformedLongPress; 2097 2098 /** 2099 * The minimum height of the view. We'll try our best to have the height 2100 * of this view to at least this amount. 2101 */ 2102 @ViewDebug.ExportedProperty(category = "measurement") 2103 private int mMinHeight; 2104 2105 /** 2106 * The minimum width of the view. We'll try our best to have the width 2107 * of this view to at least this amount. 2108 */ 2109 @ViewDebug.ExportedProperty(category = "measurement") 2110 private int mMinWidth; 2111 2112 /** 2113 * The delegate to handle touch events that are physically in this view 2114 * but should be handled by another view. 2115 */ 2116 private TouchDelegate mTouchDelegate = null; 2117 2118 /** 2119 * Solid color to use as a background when creating the drawing cache. Enables 2120 * the cache to use 16 bit bitmaps instead of 32 bit. 2121 */ 2122 private int mDrawingCacheBackgroundColor = 0; 2123 2124 /** 2125 * Special tree observer used when mAttachInfo is null. 2126 */ 2127 private ViewTreeObserver mFloatingTreeObserver; 2128 2129 /** 2130 * Cache the touch slop from the context that created the view. 2131 */ 2132 private int mTouchSlop; 2133 2134 /** 2135 * Cache drag/drop state 2136 * 2137 */ 2138 boolean mCanAcceptDrop; 2139 2140 /** 2141 * Flag indicating that a drag can cross window boundaries 2142 * @hide 2143 */ 2144 public static final int DRAG_FLAG_GLOBAL = 1; 2145 2146 /** 2147 * Position of the vertical scroll bar. 2148 */ 2149 private int mVerticalScrollbarPosition; 2150 2151 /** 2152 * Position the scroll bar at the default position as determined by the system. 2153 */ 2154 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2155 2156 /** 2157 * Position the scroll bar along the left edge. 2158 */ 2159 public static final int SCROLLBAR_POSITION_LEFT = 1; 2160 2161 /** 2162 * Position the scroll bar along the right edge. 2163 */ 2164 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2165 2166 /** 2167 * Indicates that the view does not have a layer. 2168 * 2169 * @see #getLayerType() 2170 * @see #setLayerType(int, android.graphics.Paint) 2171 * @see #LAYER_TYPE_SOFTWARE 2172 * @see #LAYER_TYPE_HARDWARE 2173 */ 2174 public static final int LAYER_TYPE_NONE = 0; 2175 2176 /** 2177 * <p>Indicates that the view has a software layer. A software layer is backed 2178 * by a bitmap and causes the view to be rendered using Android's software 2179 * rendering pipeline, even if hardware acceleration is enabled.</p> 2180 * 2181 * <p>Software layers have various usages:</p> 2182 * <p>When the application is not using hardware acceleration, a software layer 2183 * is useful to apply a specific color filter and/or blending mode and/or 2184 * translucency to a view and all its children.</p> 2185 * <p>When the application is using hardware acceleration, a software layer 2186 * is useful to render drawing primitives not supported by the hardware 2187 * accelerated pipeline. It can also be used to cache a complex view tree 2188 * into a texture and reduce the complexity of drawing operations. For instance, 2189 * when animating a complex view tree with a translation, a software layer can 2190 * be used to render the view tree only once.</p> 2191 * <p>Software layers should be avoided when the affected view tree updates 2192 * often. Every update will require to re-render the software layer, which can 2193 * potentially be slow (particularly when hardware acceleration is turned on 2194 * since the layer will have to be uploaded into a hardware texture after every 2195 * update.)</p> 2196 * 2197 * @see #getLayerType() 2198 * @see #setLayerType(int, android.graphics.Paint) 2199 * @see #LAYER_TYPE_NONE 2200 * @see #LAYER_TYPE_HARDWARE 2201 */ 2202 public static final int LAYER_TYPE_SOFTWARE = 1; 2203 2204 /** 2205 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2206 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2207 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2208 * rendering pipeline, but only if hardware acceleration is turned on for the 2209 * view hierarchy. When hardware acceleration is turned off, hardware layers 2210 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2211 * 2212 * <p>A hardware layer is useful to apply a specific color filter and/or 2213 * blending mode and/or translucency to a view and all its children.</p> 2214 * <p>A hardware layer can be used to cache a complex view tree into a 2215 * texture and reduce the complexity of drawing operations. For instance, 2216 * when animating a complex view tree with a translation, a hardware layer can 2217 * be used to render the view tree only once.</p> 2218 * <p>A hardware layer can also be used to increase the rendering quality when 2219 * rotation transformations are applied on a view. It can also be used to 2220 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2221 * 2222 * @see #getLayerType() 2223 * @see #setLayerType(int, android.graphics.Paint) 2224 * @see #LAYER_TYPE_NONE 2225 * @see #LAYER_TYPE_SOFTWARE 2226 */ 2227 public static final int LAYER_TYPE_HARDWARE = 2; 2228 2229 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2230 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2231 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2232 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2233 }) 2234 int mLayerType = LAYER_TYPE_NONE; 2235 Paint mLayerPaint; 2236 2237 /** 2238 * Simple constructor to use when creating a view from code. 2239 * 2240 * @param context The Context the view is running in, through which it can 2241 * access the current theme, resources, etc. 2242 */ 2243 public View(Context context) { 2244 mContext = context; 2245 mResources = context != null ? context.getResources() : null; 2246 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2247 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2248 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2249 } 2250 2251 /** 2252 * Constructor that is called when inflating a view from XML. This is called 2253 * when a view is being constructed from an XML file, supplying attributes 2254 * that were specified in the XML file. This version uses a default style of 2255 * 0, so the only attribute values applied are those in the Context's Theme 2256 * and the given AttributeSet. 2257 * 2258 * <p> 2259 * The method onFinishInflate() will be called after all children have been 2260 * added. 2261 * 2262 * @param context The Context the view is running in, through which it can 2263 * access the current theme, resources, etc. 2264 * @param attrs The attributes of the XML tag that is inflating the view. 2265 * @see #View(Context, AttributeSet, int) 2266 */ 2267 public View(Context context, AttributeSet attrs) { 2268 this(context, attrs, 0); 2269 } 2270 2271 /** 2272 * Perform inflation from XML and apply a class-specific base style. This 2273 * constructor of View allows subclasses to use their own base style when 2274 * they are inflating. For example, a Button class's constructor would call 2275 * this version of the super class constructor and supply 2276 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2277 * the theme's button style to modify all of the base view attributes (in 2278 * particular its background) as well as the Button class's attributes. 2279 * 2280 * @param context The Context the view is running in, through which it can 2281 * access the current theme, resources, etc. 2282 * @param attrs The attributes of the XML tag that is inflating the view. 2283 * @param defStyle The default style to apply to this view. If 0, no style 2284 * will be applied (beyond what is included in the theme). This may 2285 * either be an attribute resource, whose value will be retrieved 2286 * from the current theme, or an explicit style resource. 2287 * @see #View(Context, AttributeSet) 2288 */ 2289 public View(Context context, AttributeSet attrs, int defStyle) { 2290 this(context); 2291 2292 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2293 defStyle, 0); 2294 2295 Drawable background = null; 2296 2297 int leftPadding = -1; 2298 int topPadding = -1; 2299 int rightPadding = -1; 2300 int bottomPadding = -1; 2301 2302 int padding = -1; 2303 2304 int viewFlagValues = 0; 2305 int viewFlagMasks = 0; 2306 2307 boolean setScrollContainer = false; 2308 2309 int x = 0; 2310 int y = 0; 2311 2312 float tx = 0; 2313 float ty = 0; 2314 float rotation = 0; 2315 float rotationX = 0; 2316 float rotationY = 0; 2317 float sx = 1f; 2318 float sy = 1f; 2319 boolean transformSet = false; 2320 2321 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2322 2323 int overScrollMode = mOverScrollMode; 2324 final int N = a.getIndexCount(); 2325 for (int i = 0; i < N; i++) { 2326 int attr = a.getIndex(i); 2327 switch (attr) { 2328 case com.android.internal.R.styleable.View_background: 2329 background = a.getDrawable(attr); 2330 break; 2331 case com.android.internal.R.styleable.View_padding: 2332 padding = a.getDimensionPixelSize(attr, -1); 2333 break; 2334 case com.android.internal.R.styleable.View_paddingLeft: 2335 leftPadding = a.getDimensionPixelSize(attr, -1); 2336 break; 2337 case com.android.internal.R.styleable.View_paddingTop: 2338 topPadding = a.getDimensionPixelSize(attr, -1); 2339 break; 2340 case com.android.internal.R.styleable.View_paddingRight: 2341 rightPadding = a.getDimensionPixelSize(attr, -1); 2342 break; 2343 case com.android.internal.R.styleable.View_paddingBottom: 2344 bottomPadding = a.getDimensionPixelSize(attr, -1); 2345 break; 2346 case com.android.internal.R.styleable.View_scrollX: 2347 x = a.getDimensionPixelOffset(attr, 0); 2348 break; 2349 case com.android.internal.R.styleable.View_scrollY: 2350 y = a.getDimensionPixelOffset(attr, 0); 2351 break; 2352 case com.android.internal.R.styleable.View_alpha: 2353 setAlpha(a.getFloat(attr, 1f)); 2354 break; 2355 case com.android.internal.R.styleable.View_transformPivotX: 2356 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2357 break; 2358 case com.android.internal.R.styleable.View_transformPivotY: 2359 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2360 break; 2361 case com.android.internal.R.styleable.View_translationX: 2362 tx = a.getDimensionPixelOffset(attr, 0); 2363 transformSet = true; 2364 break; 2365 case com.android.internal.R.styleable.View_translationY: 2366 ty = a.getDimensionPixelOffset(attr, 0); 2367 transformSet = true; 2368 break; 2369 case com.android.internal.R.styleable.View_rotation: 2370 rotation = a.getFloat(attr, 0); 2371 transformSet = true; 2372 break; 2373 case com.android.internal.R.styleable.View_rotationX: 2374 rotationX = a.getFloat(attr, 0); 2375 transformSet = true; 2376 break; 2377 case com.android.internal.R.styleable.View_rotationY: 2378 rotationY = a.getFloat(attr, 0); 2379 transformSet = true; 2380 break; 2381 case com.android.internal.R.styleable.View_scaleX: 2382 sx = a.getFloat(attr, 1f); 2383 transformSet = true; 2384 break; 2385 case com.android.internal.R.styleable.View_scaleY: 2386 sy = a.getFloat(attr, 1f); 2387 transformSet = true; 2388 break; 2389 case com.android.internal.R.styleable.View_id: 2390 mID = a.getResourceId(attr, NO_ID); 2391 break; 2392 case com.android.internal.R.styleable.View_tag: 2393 mTag = a.getText(attr); 2394 break; 2395 case com.android.internal.R.styleable.View_fitsSystemWindows: 2396 if (a.getBoolean(attr, false)) { 2397 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2398 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2399 } 2400 break; 2401 case com.android.internal.R.styleable.View_focusable: 2402 if (a.getBoolean(attr, false)) { 2403 viewFlagValues |= FOCUSABLE; 2404 viewFlagMasks |= FOCUSABLE_MASK; 2405 } 2406 break; 2407 case com.android.internal.R.styleable.View_focusableInTouchMode: 2408 if (a.getBoolean(attr, false)) { 2409 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2410 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2411 } 2412 break; 2413 case com.android.internal.R.styleable.View_clickable: 2414 if (a.getBoolean(attr, false)) { 2415 viewFlagValues |= CLICKABLE; 2416 viewFlagMasks |= CLICKABLE; 2417 } 2418 break; 2419 case com.android.internal.R.styleable.View_longClickable: 2420 if (a.getBoolean(attr, false)) { 2421 viewFlagValues |= LONG_CLICKABLE; 2422 viewFlagMasks |= LONG_CLICKABLE; 2423 } 2424 break; 2425 case com.android.internal.R.styleable.View_saveEnabled: 2426 if (!a.getBoolean(attr, true)) { 2427 viewFlagValues |= SAVE_DISABLED; 2428 viewFlagMasks |= SAVE_DISABLED_MASK; 2429 } 2430 break; 2431 case com.android.internal.R.styleable.View_duplicateParentState: 2432 if (a.getBoolean(attr, false)) { 2433 viewFlagValues |= DUPLICATE_PARENT_STATE; 2434 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2435 } 2436 break; 2437 case com.android.internal.R.styleable.View_visibility: 2438 final int visibility = a.getInt(attr, 0); 2439 if (visibility != 0) { 2440 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2441 viewFlagMasks |= VISIBILITY_MASK; 2442 } 2443 break; 2444 case com.android.internal.R.styleable.View_drawingCacheQuality: 2445 final int cacheQuality = a.getInt(attr, 0); 2446 if (cacheQuality != 0) { 2447 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2448 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2449 } 2450 break; 2451 case com.android.internal.R.styleable.View_contentDescription: 2452 mContentDescription = a.getString(attr); 2453 break; 2454 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2455 if (!a.getBoolean(attr, true)) { 2456 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2457 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2458 } 2459 break; 2460 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2461 if (!a.getBoolean(attr, true)) { 2462 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2463 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2464 } 2465 break; 2466 case R.styleable.View_scrollbars: 2467 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2468 if (scrollbars != SCROLLBARS_NONE) { 2469 viewFlagValues |= scrollbars; 2470 viewFlagMasks |= SCROLLBARS_MASK; 2471 initializeScrollbars(a); 2472 } 2473 break; 2474 case R.styleable.View_fadingEdge: 2475 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2476 if (fadingEdge != FADING_EDGE_NONE) { 2477 viewFlagValues |= fadingEdge; 2478 viewFlagMasks |= FADING_EDGE_MASK; 2479 initializeFadingEdge(a); 2480 } 2481 break; 2482 case R.styleable.View_scrollbarStyle: 2483 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2484 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2485 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2486 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2487 } 2488 break; 2489 case R.styleable.View_isScrollContainer: 2490 setScrollContainer = true; 2491 if (a.getBoolean(attr, false)) { 2492 setScrollContainer(true); 2493 } 2494 break; 2495 case com.android.internal.R.styleable.View_keepScreenOn: 2496 if (a.getBoolean(attr, false)) { 2497 viewFlagValues |= KEEP_SCREEN_ON; 2498 viewFlagMasks |= KEEP_SCREEN_ON; 2499 } 2500 break; 2501 case R.styleable.View_filterTouchesWhenObscured: 2502 if (a.getBoolean(attr, false)) { 2503 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2504 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2505 } 2506 break; 2507 case R.styleable.View_nextFocusLeft: 2508 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2509 break; 2510 case R.styleable.View_nextFocusRight: 2511 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2512 break; 2513 case R.styleable.View_nextFocusUp: 2514 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2515 break; 2516 case R.styleable.View_nextFocusDown: 2517 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2518 break; 2519 case R.styleable.View_nextFocusForward: 2520 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2521 break; 2522 case R.styleable.View_minWidth: 2523 mMinWidth = a.getDimensionPixelSize(attr, 0); 2524 break; 2525 case R.styleable.View_minHeight: 2526 mMinHeight = a.getDimensionPixelSize(attr, 0); 2527 break; 2528 case R.styleable.View_onClick: 2529 if (context.isRestricted()) { 2530 throw new IllegalStateException("The android:onClick attribute cannot " 2531 + "be used within a restricted context"); 2532 } 2533 2534 final String handlerName = a.getString(attr); 2535 if (handlerName != null) { 2536 setOnClickListener(new OnClickListener() { 2537 private Method mHandler; 2538 2539 public void onClick(View v) { 2540 if (mHandler == null) { 2541 try { 2542 mHandler = getContext().getClass().getMethod(handlerName, 2543 View.class); 2544 } catch (NoSuchMethodException e) { 2545 int id = getId(); 2546 String idText = id == NO_ID ? "" : " with id '" 2547 + getContext().getResources().getResourceEntryName( 2548 id) + "'"; 2549 throw new IllegalStateException("Could not find a method " + 2550 handlerName + "(View) in the activity " 2551 + getContext().getClass() + " for onClick handler" 2552 + " on view " + View.this.getClass() + idText, e); 2553 } 2554 } 2555 2556 try { 2557 mHandler.invoke(getContext(), View.this); 2558 } catch (IllegalAccessException e) { 2559 throw new IllegalStateException("Could not execute non " 2560 + "public method of the activity", e); 2561 } catch (InvocationTargetException e) { 2562 throw new IllegalStateException("Could not execute " 2563 + "method of the activity", e); 2564 } 2565 } 2566 }); 2567 } 2568 break; 2569 case R.styleable.View_overScrollMode: 2570 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2571 break; 2572 case R.styleable.View_verticalScrollbarPosition: 2573 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2574 break; 2575 case R.styleable.View_layerType: 2576 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2577 break; 2578 } 2579 } 2580 2581 setOverScrollMode(overScrollMode); 2582 2583 if (background != null) { 2584 setBackgroundDrawable(background); 2585 } 2586 2587 if (padding >= 0) { 2588 leftPadding = padding; 2589 topPadding = padding; 2590 rightPadding = padding; 2591 bottomPadding = padding; 2592 } 2593 2594 // If the user specified the padding (either with android:padding or 2595 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2596 // use the default padding or the padding from the background drawable 2597 // (stored at this point in mPadding*) 2598 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2599 topPadding >= 0 ? topPadding : mPaddingTop, 2600 rightPadding >= 0 ? rightPadding : mPaddingRight, 2601 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2602 2603 if (viewFlagMasks != 0) { 2604 setFlags(viewFlagValues, viewFlagMasks); 2605 } 2606 2607 // Needs to be called after mViewFlags is set 2608 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2609 recomputePadding(); 2610 } 2611 2612 if (x != 0 || y != 0) { 2613 scrollTo(x, y); 2614 } 2615 2616 if (transformSet) { 2617 setTranslationX(tx); 2618 setTranslationY(ty); 2619 setRotation(rotation); 2620 setRotationX(rotationX); 2621 setRotationY(rotationY); 2622 setScaleX(sx); 2623 setScaleY(sy); 2624 } 2625 2626 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2627 setScrollContainer(true); 2628 } 2629 2630 computeOpaqueFlags(); 2631 2632 a.recycle(); 2633 } 2634 2635 /** 2636 * Non-public constructor for use in testing 2637 */ 2638 View() { 2639 } 2640 2641 /** 2642 * <p> 2643 * Initializes the fading edges from a given set of styled attributes. This 2644 * method should be called by subclasses that need fading edges and when an 2645 * instance of these subclasses is created programmatically rather than 2646 * being inflated from XML. This method is automatically called when the XML 2647 * is inflated. 2648 * </p> 2649 * 2650 * @param a the styled attributes set to initialize the fading edges from 2651 */ 2652 protected void initializeFadingEdge(TypedArray a) { 2653 initScrollCache(); 2654 2655 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2656 R.styleable.View_fadingEdgeLength, 2657 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2658 } 2659 2660 /** 2661 * Returns the size of the vertical faded edges used to indicate that more 2662 * content in this view is visible. 2663 * 2664 * @return The size in pixels of the vertical faded edge or 0 if vertical 2665 * faded edges are not enabled for this view. 2666 * @attr ref android.R.styleable#View_fadingEdgeLength 2667 */ 2668 public int getVerticalFadingEdgeLength() { 2669 if (isVerticalFadingEdgeEnabled()) { 2670 ScrollabilityCache cache = mScrollCache; 2671 if (cache != null) { 2672 return cache.fadingEdgeLength; 2673 } 2674 } 2675 return 0; 2676 } 2677 2678 /** 2679 * Set the size of the faded edge used to indicate that more content in this 2680 * view is available. Will not change whether the fading edge is enabled; use 2681 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2682 * to enable the fading edge for the vertical or horizontal fading edges. 2683 * 2684 * @param length The size in pixels of the faded edge used to indicate that more 2685 * content in this view is visible. 2686 */ 2687 public void setFadingEdgeLength(int length) { 2688 initScrollCache(); 2689 mScrollCache.fadingEdgeLength = length; 2690 } 2691 2692 /** 2693 * Returns the size of the horizontal faded edges used to indicate that more 2694 * content in this view is visible. 2695 * 2696 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2697 * faded edges are not enabled for this view. 2698 * @attr ref android.R.styleable#View_fadingEdgeLength 2699 */ 2700 public int getHorizontalFadingEdgeLength() { 2701 if (isHorizontalFadingEdgeEnabled()) { 2702 ScrollabilityCache cache = mScrollCache; 2703 if (cache != null) { 2704 return cache.fadingEdgeLength; 2705 } 2706 } 2707 return 0; 2708 } 2709 2710 /** 2711 * Returns the width of the vertical scrollbar. 2712 * 2713 * @return The width in pixels of the vertical scrollbar or 0 if there 2714 * is no vertical scrollbar. 2715 */ 2716 public int getVerticalScrollbarWidth() { 2717 ScrollabilityCache cache = mScrollCache; 2718 if (cache != null) { 2719 ScrollBarDrawable scrollBar = cache.scrollBar; 2720 if (scrollBar != null) { 2721 int size = scrollBar.getSize(true); 2722 if (size <= 0) { 2723 size = cache.scrollBarSize; 2724 } 2725 return size; 2726 } 2727 return 0; 2728 } 2729 return 0; 2730 } 2731 2732 /** 2733 * Returns the height of the horizontal scrollbar. 2734 * 2735 * @return The height in pixels of the horizontal scrollbar or 0 if 2736 * there is no horizontal scrollbar. 2737 */ 2738 protected int getHorizontalScrollbarHeight() { 2739 ScrollabilityCache cache = mScrollCache; 2740 if (cache != null) { 2741 ScrollBarDrawable scrollBar = cache.scrollBar; 2742 if (scrollBar != null) { 2743 int size = scrollBar.getSize(false); 2744 if (size <= 0) { 2745 size = cache.scrollBarSize; 2746 } 2747 return size; 2748 } 2749 return 0; 2750 } 2751 return 0; 2752 } 2753 2754 /** 2755 * <p> 2756 * Initializes the scrollbars from a given set of styled attributes. This 2757 * method should be called by subclasses that need scrollbars and when an 2758 * instance of these subclasses is created programmatically rather than 2759 * being inflated from XML. This method is automatically called when the XML 2760 * is inflated. 2761 * </p> 2762 * 2763 * @param a the styled attributes set to initialize the scrollbars from 2764 */ 2765 protected void initializeScrollbars(TypedArray a) { 2766 initScrollCache(); 2767 2768 final ScrollabilityCache scrollabilityCache = mScrollCache; 2769 2770 if (scrollabilityCache.scrollBar == null) { 2771 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2772 } 2773 2774 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2775 2776 if (!fadeScrollbars) { 2777 scrollabilityCache.state = ScrollabilityCache.ON; 2778 } 2779 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2780 2781 2782 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2783 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2784 .getScrollBarFadeDuration()); 2785 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2786 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2787 ViewConfiguration.getScrollDefaultDelay()); 2788 2789 2790 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2791 com.android.internal.R.styleable.View_scrollbarSize, 2792 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2793 2794 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2795 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2796 2797 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2798 if (thumb != null) { 2799 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2800 } 2801 2802 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2803 false); 2804 if (alwaysDraw) { 2805 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2806 } 2807 2808 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2809 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2810 2811 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2812 if (thumb != null) { 2813 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2814 } 2815 2816 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2817 false); 2818 if (alwaysDraw) { 2819 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2820 } 2821 2822 // Re-apply user/background padding so that scrollbar(s) get added 2823 recomputePadding(); 2824 } 2825 2826 /** 2827 * <p> 2828 * Initalizes the scrollability cache if necessary. 2829 * </p> 2830 */ 2831 private void initScrollCache() { 2832 if (mScrollCache == null) { 2833 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2834 } 2835 } 2836 2837 /** 2838 * Set the position of the vertical scroll bar. Should be one of 2839 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 2840 * {@link #SCROLLBAR_POSITION_RIGHT}. 2841 * 2842 * @param position Where the vertical scroll bar should be positioned. 2843 */ 2844 public void setVerticalScrollbarPosition(int position) { 2845 if (mVerticalScrollbarPosition != position) { 2846 mVerticalScrollbarPosition = position; 2847 computeOpaqueFlags(); 2848 recomputePadding(); 2849 } 2850 } 2851 2852 /** 2853 * @return The position where the vertical scroll bar will show, if applicable. 2854 * @see #setVerticalScrollbarPosition(int) 2855 */ 2856 public int getVerticalScrollbarPosition() { 2857 return mVerticalScrollbarPosition; 2858 } 2859 2860 /** 2861 * Register a callback to be invoked when focus of this view changed. 2862 * 2863 * @param l The callback that will run. 2864 */ 2865 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2866 mOnFocusChangeListener = l; 2867 } 2868 2869 /** 2870 * Add a listener that will be called when the bounds of the view change due to 2871 * layout processing. 2872 * 2873 * @param listener The listener that will be called when layout bounds change. 2874 */ 2875 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 2876 if (mOnLayoutChangeListeners == null) { 2877 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 2878 } 2879 mOnLayoutChangeListeners.add(listener); 2880 } 2881 2882 /** 2883 * Remove a listener for layout changes. 2884 * 2885 * @param listener The listener for layout bounds change. 2886 */ 2887 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 2888 if (mOnLayoutChangeListeners == null) { 2889 return; 2890 } 2891 mOnLayoutChangeListeners.remove(listener); 2892 } 2893 2894 /** 2895 * Gets the current list of listeners for layout changes. 2896 */ 2897 public List<OnLayoutChangeListener> getOnLayoutChangeListeners() { 2898 return mOnLayoutChangeListeners; 2899 } 2900 2901 /** 2902 * Returns the focus-change callback registered for this view. 2903 * 2904 * @return The callback, or null if one is not registered. 2905 */ 2906 public OnFocusChangeListener getOnFocusChangeListener() { 2907 return mOnFocusChangeListener; 2908 } 2909 2910 /** 2911 * Register a callback to be invoked when this view is clicked. If this view is not 2912 * clickable, it becomes clickable. 2913 * 2914 * @param l The callback that will run 2915 * 2916 * @see #setClickable(boolean) 2917 */ 2918 public void setOnClickListener(OnClickListener l) { 2919 if (!isClickable()) { 2920 setClickable(true); 2921 } 2922 mOnClickListener = l; 2923 } 2924 2925 /** 2926 * Register a callback to be invoked when this view is clicked and held. If this view is not 2927 * long clickable, it becomes long clickable. 2928 * 2929 * @param l The callback that will run 2930 * 2931 * @see #setLongClickable(boolean) 2932 */ 2933 public void setOnLongClickListener(OnLongClickListener l) { 2934 if (!isLongClickable()) { 2935 setLongClickable(true); 2936 } 2937 mOnLongClickListener = l; 2938 } 2939 2940 /** 2941 * Register a callback to be invoked when the context menu for this view is 2942 * being built. If this view is not long clickable, it becomes long clickable. 2943 * 2944 * @param l The callback that will run 2945 * 2946 */ 2947 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 2948 if (!isLongClickable()) { 2949 setLongClickable(true); 2950 } 2951 mOnCreateContextMenuListener = l; 2952 } 2953 2954 /** 2955 * Call this view's OnClickListener, if it is defined. 2956 * 2957 * @return True there was an assigned OnClickListener that was called, false 2958 * otherwise is returned. 2959 */ 2960 public boolean performClick() { 2961 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 2962 2963 if (mOnClickListener != null) { 2964 playSoundEffect(SoundEffectConstants.CLICK); 2965 mOnClickListener.onClick(this); 2966 return true; 2967 } 2968 2969 return false; 2970 } 2971 2972 /** 2973 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 2974 * OnLongClickListener did not consume the event. 2975 * 2976 * @return True if one of the above receivers consumed the event, false otherwise. 2977 */ 2978 public boolean performLongClick() { 2979 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 2980 2981 boolean handled = false; 2982 if (mOnLongClickListener != null) { 2983 handled = mOnLongClickListener.onLongClick(View.this); 2984 } 2985 if (!handled) { 2986 handled = showContextMenu(); 2987 } 2988 if (handled) { 2989 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 2990 } 2991 return handled; 2992 } 2993 2994 /** 2995 * Bring up the context menu for this view. 2996 * 2997 * @return Whether a context menu was displayed. 2998 */ 2999 public boolean showContextMenu() { 3000 return getParent().showContextMenuForChild(this); 3001 } 3002 3003 /** 3004 * Start an action mode. 3005 * 3006 * @param callback Callback that will control the lifecycle of the action mode 3007 * @return The new action mode if it is started, null otherwise 3008 * 3009 * @see ActionMode 3010 */ 3011 public ActionMode startActionMode(ActionMode.Callback callback) { 3012 return getParent().startActionModeForChild(this, callback); 3013 } 3014 3015 /** 3016 * Register a callback to be invoked when a key is pressed in this view. 3017 * @param l the key listener to attach to this view 3018 */ 3019 public void setOnKeyListener(OnKeyListener l) { 3020 mOnKeyListener = l; 3021 } 3022 3023 /** 3024 * Register a callback to be invoked when a touch event is sent to this view. 3025 * @param l the touch listener to attach to this view 3026 */ 3027 public void setOnTouchListener(OnTouchListener l) { 3028 mOnTouchListener = l; 3029 } 3030 3031 /** 3032 * Register a callback to be invoked when a drag event is sent to this view. 3033 * @param l The drag listener to attach to this view 3034 */ 3035 public void setOnDragListener(OnDragListener l) { 3036 mOnDragListener = l; 3037 } 3038 3039 /** 3040 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 3041 * 3042 * Note: this does not check whether this {@link View} should get focus, it just 3043 * gives it focus no matter what. It should only be called internally by framework 3044 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3045 * 3046 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 3047 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 3048 * focus moved when requestFocus() is called. It may not always 3049 * apply, in which case use the default View.FOCUS_DOWN. 3050 * @param previouslyFocusedRect The rectangle of the view that had focus 3051 * prior in this View's coordinate system. 3052 */ 3053 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3054 if (DBG) { 3055 System.out.println(this + " requestFocus()"); 3056 } 3057 3058 if ((mPrivateFlags & FOCUSED) == 0) { 3059 mPrivateFlags |= FOCUSED; 3060 3061 if (mParent != null) { 3062 mParent.requestChildFocus(this, this); 3063 } 3064 3065 onFocusChanged(true, direction, previouslyFocusedRect); 3066 refreshDrawableState(); 3067 } 3068 } 3069 3070 /** 3071 * Request that a rectangle of this view be visible on the screen, 3072 * scrolling if necessary just enough. 3073 * 3074 * <p>A View should call this if it maintains some notion of which part 3075 * of its content is interesting. For example, a text editing view 3076 * should call this when its cursor moves. 3077 * 3078 * @param rectangle The rectangle. 3079 * @return Whether any parent scrolled. 3080 */ 3081 public boolean requestRectangleOnScreen(Rect rectangle) { 3082 return requestRectangleOnScreen(rectangle, false); 3083 } 3084 3085 /** 3086 * Request that a rectangle of this view be visible on the screen, 3087 * scrolling if necessary just enough. 3088 * 3089 * <p>A View should call this if it maintains some notion of which part 3090 * of its content is interesting. For example, a text editing view 3091 * should call this when its cursor moves. 3092 * 3093 * <p>When <code>immediate</code> is set to true, scrolling will not be 3094 * animated. 3095 * 3096 * @param rectangle The rectangle. 3097 * @param immediate True to forbid animated scrolling, false otherwise 3098 * @return Whether any parent scrolled. 3099 */ 3100 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3101 View child = this; 3102 ViewParent parent = mParent; 3103 boolean scrolled = false; 3104 while (parent != null) { 3105 scrolled |= parent.requestChildRectangleOnScreen(child, 3106 rectangle, immediate); 3107 3108 // offset rect so next call has the rectangle in the 3109 // coordinate system of its direct child. 3110 rectangle.offset(child.getLeft(), child.getTop()); 3111 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3112 3113 if (!(parent instanceof View)) { 3114 break; 3115 } 3116 3117 child = (View) parent; 3118 parent = child.getParent(); 3119 } 3120 return scrolled; 3121 } 3122 3123 /** 3124 * Called when this view wants to give up focus. This will cause 3125 * {@link #onFocusChanged} to be called. 3126 */ 3127 public void clearFocus() { 3128 if (DBG) { 3129 System.out.println(this + " clearFocus()"); 3130 } 3131 3132 if ((mPrivateFlags & FOCUSED) != 0) { 3133 mPrivateFlags &= ~FOCUSED; 3134 3135 if (mParent != null) { 3136 mParent.clearChildFocus(this); 3137 } 3138 3139 onFocusChanged(false, 0, null); 3140 refreshDrawableState(); 3141 } 3142 } 3143 3144 /** 3145 * Called to clear the focus of a view that is about to be removed. 3146 * Doesn't call clearChildFocus, which prevents this view from taking 3147 * focus again before it has been removed from the parent 3148 */ 3149 void clearFocusForRemoval() { 3150 if ((mPrivateFlags & FOCUSED) != 0) { 3151 mPrivateFlags &= ~FOCUSED; 3152 3153 onFocusChanged(false, 0, null); 3154 refreshDrawableState(); 3155 } 3156 } 3157 3158 /** 3159 * Called internally by the view system when a new view is getting focus. 3160 * This is what clears the old focus. 3161 */ 3162 void unFocus() { 3163 if (DBG) { 3164 System.out.println(this + " unFocus()"); 3165 } 3166 3167 if ((mPrivateFlags & FOCUSED) != 0) { 3168 mPrivateFlags &= ~FOCUSED; 3169 3170 onFocusChanged(false, 0, null); 3171 refreshDrawableState(); 3172 } 3173 } 3174 3175 /** 3176 * Returns true if this view has focus iteself, or is the ancestor of the 3177 * view that has focus. 3178 * 3179 * @return True if this view has or contains focus, false otherwise. 3180 */ 3181 @ViewDebug.ExportedProperty(category = "focus") 3182 public boolean hasFocus() { 3183 return (mPrivateFlags & FOCUSED) != 0; 3184 } 3185 3186 /** 3187 * Returns true if this view is focusable or if it contains a reachable View 3188 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3189 * is a View whose parents do not block descendants focus. 3190 * 3191 * Only {@link #VISIBLE} views are considered focusable. 3192 * 3193 * @return True if the view is focusable or if the view contains a focusable 3194 * View, false otherwise. 3195 * 3196 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3197 */ 3198 public boolean hasFocusable() { 3199 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3200 } 3201 3202 /** 3203 * Called by the view system when the focus state of this view changes. 3204 * When the focus change event is caused by directional navigation, direction 3205 * and previouslyFocusedRect provide insight into where the focus is coming from. 3206 * When overriding, be sure to call up through to the super class so that 3207 * the standard focus handling will occur. 3208 * 3209 * @param gainFocus True if the View has focus; false otherwise. 3210 * @param direction The direction focus has moved when requestFocus() 3211 * is called to give this view focus. Values are 3212 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3213 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3214 * It may not always apply, in which case use the default. 3215 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3216 * system, of the previously focused view. If applicable, this will be 3217 * passed in as finer grained information about where the focus is coming 3218 * from (in addition to direction). Will be <code>null</code> otherwise. 3219 */ 3220 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3221 if (gainFocus) { 3222 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3223 } 3224 3225 InputMethodManager imm = InputMethodManager.peekInstance(); 3226 if (!gainFocus) { 3227 if (isPressed()) { 3228 setPressed(false); 3229 } 3230 if (imm != null && mAttachInfo != null 3231 && mAttachInfo.mHasWindowFocus) { 3232 imm.focusOut(this); 3233 } 3234 onFocusLost(); 3235 } else if (imm != null && mAttachInfo != null 3236 && mAttachInfo.mHasWindowFocus) { 3237 imm.focusIn(this); 3238 } 3239 3240 invalidate(); 3241 if (mOnFocusChangeListener != null) { 3242 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3243 } 3244 3245 if (mAttachInfo != null) { 3246 mAttachInfo.mKeyDispatchState.reset(this); 3247 } 3248 } 3249 3250 /** 3251 * {@inheritDoc} 3252 */ 3253 public void sendAccessibilityEvent(int eventType) { 3254 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3255 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3256 } 3257 } 3258 3259 /** 3260 * {@inheritDoc} 3261 */ 3262 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3263 event.setClassName(getClass().getName()); 3264 event.setPackageName(getContext().getPackageName()); 3265 event.setEnabled(isEnabled()); 3266 event.setContentDescription(mContentDescription); 3267 3268 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3269 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3270 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3271 event.setItemCount(focusablesTempList.size()); 3272 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3273 focusablesTempList.clear(); 3274 } 3275 3276 dispatchPopulateAccessibilityEvent(event); 3277 3278 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 3279 } 3280 3281 /** 3282 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 3283 * to be populated. 3284 * 3285 * @param event The event. 3286 * 3287 * @return True if the event population was completed. 3288 */ 3289 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3290 return false; 3291 } 3292 3293 /** 3294 * Gets the {@link View} description. It briefly describes the view and is 3295 * primarily used for accessibility support. Set this property to enable 3296 * better accessibility support for your application. This is especially 3297 * true for views that do not have textual representation (For example, 3298 * ImageButton). 3299 * 3300 * @return The content descriptiopn. 3301 * 3302 * @attr ref android.R.styleable#View_contentDescription 3303 */ 3304 public CharSequence getContentDescription() { 3305 return mContentDescription; 3306 } 3307 3308 /** 3309 * Sets the {@link View} description. It briefly describes the view and is 3310 * primarily used for accessibility support. Set this property to enable 3311 * better accessibility support for your application. This is especially 3312 * true for views that do not have textual representation (For example, 3313 * ImageButton). 3314 * 3315 * @param contentDescription The content description. 3316 * 3317 * @attr ref android.R.styleable#View_contentDescription 3318 */ 3319 public void setContentDescription(CharSequence contentDescription) { 3320 mContentDescription = contentDescription; 3321 } 3322 3323 /** 3324 * Invoked whenever this view loses focus, either by losing window focus or by losing 3325 * focus within its window. This method can be used to clear any state tied to the 3326 * focus. For instance, if a button is held pressed with the trackball and the window 3327 * loses focus, this method can be used to cancel the press. 3328 * 3329 * Subclasses of View overriding this method should always call super.onFocusLost(). 3330 * 3331 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3332 * @see #onWindowFocusChanged(boolean) 3333 * 3334 * @hide pending API council approval 3335 */ 3336 protected void onFocusLost() { 3337 resetPressedState(); 3338 } 3339 3340 private void resetPressedState() { 3341 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3342 return; 3343 } 3344 3345 if (isPressed()) { 3346 setPressed(false); 3347 3348 if (!mHasPerformedLongPress) { 3349 removeLongPressCallback(); 3350 } 3351 } 3352 } 3353 3354 /** 3355 * Returns true if this view has focus 3356 * 3357 * @return True if this view has focus, false otherwise. 3358 */ 3359 @ViewDebug.ExportedProperty(category = "focus") 3360 public boolean isFocused() { 3361 return (mPrivateFlags & FOCUSED) != 0; 3362 } 3363 3364 /** 3365 * Find the view in the hierarchy rooted at this view that currently has 3366 * focus. 3367 * 3368 * @return The view that currently has focus, or null if no focused view can 3369 * be found. 3370 */ 3371 public View findFocus() { 3372 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3373 } 3374 3375 /** 3376 * Change whether this view is one of the set of scrollable containers in 3377 * its window. This will be used to determine whether the window can 3378 * resize or must pan when a soft input area is open -- scrollable 3379 * containers allow the window to use resize mode since the container 3380 * will appropriately shrink. 3381 */ 3382 public void setScrollContainer(boolean isScrollContainer) { 3383 if (isScrollContainer) { 3384 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3385 mAttachInfo.mScrollContainers.add(this); 3386 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3387 } 3388 mPrivateFlags |= SCROLL_CONTAINER; 3389 } else { 3390 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3391 mAttachInfo.mScrollContainers.remove(this); 3392 } 3393 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3394 } 3395 } 3396 3397 /** 3398 * Returns the quality of the drawing cache. 3399 * 3400 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3401 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3402 * 3403 * @see #setDrawingCacheQuality(int) 3404 * @see #setDrawingCacheEnabled(boolean) 3405 * @see #isDrawingCacheEnabled() 3406 * 3407 * @attr ref android.R.styleable#View_drawingCacheQuality 3408 */ 3409 public int getDrawingCacheQuality() { 3410 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3411 } 3412 3413 /** 3414 * Set the drawing cache quality of this view. This value is used only when the 3415 * drawing cache is enabled 3416 * 3417 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3418 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3419 * 3420 * @see #getDrawingCacheQuality() 3421 * @see #setDrawingCacheEnabled(boolean) 3422 * @see #isDrawingCacheEnabled() 3423 * 3424 * @attr ref android.R.styleable#View_drawingCacheQuality 3425 */ 3426 public void setDrawingCacheQuality(int quality) { 3427 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3428 } 3429 3430 /** 3431 * Returns whether the screen should remain on, corresponding to the current 3432 * value of {@link #KEEP_SCREEN_ON}. 3433 * 3434 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3435 * 3436 * @see #setKeepScreenOn(boolean) 3437 * 3438 * @attr ref android.R.styleable#View_keepScreenOn 3439 */ 3440 public boolean getKeepScreenOn() { 3441 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3442 } 3443 3444 /** 3445 * Controls whether the screen should remain on, modifying the 3446 * value of {@link #KEEP_SCREEN_ON}. 3447 * 3448 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3449 * 3450 * @see #getKeepScreenOn() 3451 * 3452 * @attr ref android.R.styleable#View_keepScreenOn 3453 */ 3454 public void setKeepScreenOn(boolean keepScreenOn) { 3455 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3456 } 3457 3458 /** 3459 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3460 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3461 * 3462 * @attr ref android.R.styleable#View_nextFocusLeft 3463 */ 3464 public int getNextFocusLeftId() { 3465 return mNextFocusLeftId; 3466 } 3467 3468 /** 3469 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3470 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3471 * decide automatically. 3472 * 3473 * @attr ref android.R.styleable#View_nextFocusLeft 3474 */ 3475 public void setNextFocusLeftId(int nextFocusLeftId) { 3476 mNextFocusLeftId = nextFocusLeftId; 3477 } 3478 3479 /** 3480 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3481 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3482 * 3483 * @attr ref android.R.styleable#View_nextFocusRight 3484 */ 3485 public int getNextFocusRightId() { 3486 return mNextFocusRightId; 3487 } 3488 3489 /** 3490 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3491 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3492 * decide automatically. 3493 * 3494 * @attr ref android.R.styleable#View_nextFocusRight 3495 */ 3496 public void setNextFocusRightId(int nextFocusRightId) { 3497 mNextFocusRightId = nextFocusRightId; 3498 } 3499 3500 /** 3501 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3502 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3503 * 3504 * @attr ref android.R.styleable#View_nextFocusUp 3505 */ 3506 public int getNextFocusUpId() { 3507 return mNextFocusUpId; 3508 } 3509 3510 /** 3511 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3512 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 3513 * decide automatically. 3514 * 3515 * @attr ref android.R.styleable#View_nextFocusUp 3516 */ 3517 public void setNextFocusUpId(int nextFocusUpId) { 3518 mNextFocusUpId = nextFocusUpId; 3519 } 3520 3521 /** 3522 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3523 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3524 * 3525 * @attr ref android.R.styleable#View_nextFocusDown 3526 */ 3527 public int getNextFocusDownId() { 3528 return mNextFocusDownId; 3529 } 3530 3531 /** 3532 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3533 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 3534 * decide automatically. 3535 * 3536 * @attr ref android.R.styleable#View_nextFocusDown 3537 */ 3538 public void setNextFocusDownId(int nextFocusDownId) { 3539 mNextFocusDownId = nextFocusDownId; 3540 } 3541 3542 /** 3543 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3544 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3545 * 3546 * @attr ref android.R.styleable#View_nextFocusForward 3547 */ 3548 public int getNextFocusForwardId() { 3549 return mNextFocusForwardId; 3550 } 3551 3552 /** 3553 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3554 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 3555 * decide automatically. 3556 * 3557 * @attr ref android.R.styleable#View_nextFocusForward 3558 */ 3559 public void setNextFocusForwardId(int nextFocusForwardId) { 3560 mNextFocusForwardId = nextFocusForwardId; 3561 } 3562 3563 /** 3564 * Returns the visibility of this view and all of its ancestors 3565 * 3566 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3567 */ 3568 public boolean isShown() { 3569 View current = this; 3570 //noinspection ConstantConditions 3571 do { 3572 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3573 return false; 3574 } 3575 ViewParent parent = current.mParent; 3576 if (parent == null) { 3577 return false; // We are not attached to the view root 3578 } 3579 if (!(parent instanceof View)) { 3580 return true; 3581 } 3582 current = (View) parent; 3583 } while (current != null); 3584 3585 return false; 3586 } 3587 3588 /** 3589 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3590 * is set 3591 * 3592 * @param insets Insets for system windows 3593 * 3594 * @return True if this view applied the insets, false otherwise 3595 */ 3596 protected boolean fitSystemWindows(Rect insets) { 3597 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3598 mPaddingLeft = insets.left; 3599 mPaddingTop = insets.top; 3600 mPaddingRight = insets.right; 3601 mPaddingBottom = insets.bottom; 3602 requestLayout(); 3603 return true; 3604 } 3605 return false; 3606 } 3607 3608 /** 3609 * Determine if this view has the FITS_SYSTEM_WINDOWS flag set. 3610 * @return True if window has FITS_SYSTEM_WINDOWS set 3611 * 3612 * @hide 3613 */ 3614 public boolean isFitsSystemWindowsFlagSet() { 3615 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 3616 } 3617 3618 /** 3619 * Returns the visibility status for this view. 3620 * 3621 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3622 * @attr ref android.R.styleable#View_visibility 3623 */ 3624 @ViewDebug.ExportedProperty(mapping = { 3625 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3626 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3627 @ViewDebug.IntToString(from = GONE, to = "GONE") 3628 }) 3629 public int getVisibility() { 3630 return mViewFlags & VISIBILITY_MASK; 3631 } 3632 3633 /** 3634 * Set the enabled state of this view. 3635 * 3636 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3637 * @attr ref android.R.styleable#View_visibility 3638 */ 3639 @RemotableViewMethod 3640 public void setVisibility(int visibility) { 3641 setFlags(visibility, VISIBILITY_MASK); 3642 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3643 } 3644 3645 /** 3646 * Returns the enabled status for this view. The interpretation of the 3647 * enabled state varies by subclass. 3648 * 3649 * @return True if this view is enabled, false otherwise. 3650 */ 3651 @ViewDebug.ExportedProperty 3652 public boolean isEnabled() { 3653 return (mViewFlags & ENABLED_MASK) == ENABLED; 3654 } 3655 3656 /** 3657 * Set the enabled state of this view. The interpretation of the enabled 3658 * state varies by subclass. 3659 * 3660 * @param enabled True if this view is enabled, false otherwise. 3661 */ 3662 @RemotableViewMethod 3663 public void setEnabled(boolean enabled) { 3664 if (enabled == isEnabled()) return; 3665 3666 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3667 3668 /* 3669 * The View most likely has to change its appearance, so refresh 3670 * the drawable state. 3671 */ 3672 refreshDrawableState(); 3673 3674 // Invalidate too, since the default behavior for views is to be 3675 // be drawn at 50% alpha rather than to change the drawable. 3676 invalidate(); 3677 } 3678 3679 /** 3680 * Set whether this view can receive the focus. 3681 * 3682 * Setting this to false will also ensure that this view is not focusable 3683 * in touch mode. 3684 * 3685 * @param focusable If true, this view can receive the focus. 3686 * 3687 * @see #setFocusableInTouchMode(boolean) 3688 * @attr ref android.R.styleable#View_focusable 3689 */ 3690 public void setFocusable(boolean focusable) { 3691 if (!focusable) { 3692 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3693 } 3694 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3695 } 3696 3697 /** 3698 * Set whether this view can receive focus while in touch mode. 3699 * 3700 * Setting this to true will also ensure that this view is focusable. 3701 * 3702 * @param focusableInTouchMode If true, this view can receive the focus while 3703 * in touch mode. 3704 * 3705 * @see #setFocusable(boolean) 3706 * @attr ref android.R.styleable#View_focusableInTouchMode 3707 */ 3708 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3709 // Focusable in touch mode should always be set before the focusable flag 3710 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3711 // which, in touch mode, will not successfully request focus on this view 3712 // because the focusable in touch mode flag is not set 3713 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3714 if (focusableInTouchMode) { 3715 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3716 } 3717 } 3718 3719 /** 3720 * Set whether this view should have sound effects enabled for events such as 3721 * clicking and touching. 3722 * 3723 * <p>You may wish to disable sound effects for a view if you already play sounds, 3724 * for instance, a dial key that plays dtmf tones. 3725 * 3726 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3727 * @see #isSoundEffectsEnabled() 3728 * @see #playSoundEffect(int) 3729 * @attr ref android.R.styleable#View_soundEffectsEnabled 3730 */ 3731 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3732 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3733 } 3734 3735 /** 3736 * @return whether this view should have sound effects enabled for events such as 3737 * clicking and touching. 3738 * 3739 * @see #setSoundEffectsEnabled(boolean) 3740 * @see #playSoundEffect(int) 3741 * @attr ref android.R.styleable#View_soundEffectsEnabled 3742 */ 3743 @ViewDebug.ExportedProperty 3744 public boolean isSoundEffectsEnabled() { 3745 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3746 } 3747 3748 /** 3749 * Set whether this view should have haptic feedback for events such as 3750 * long presses. 3751 * 3752 * <p>You may wish to disable haptic feedback if your view already controls 3753 * its own haptic feedback. 3754 * 3755 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3756 * @see #isHapticFeedbackEnabled() 3757 * @see #performHapticFeedback(int) 3758 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3759 */ 3760 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3761 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3762 } 3763 3764 /** 3765 * @return whether this view should have haptic feedback enabled for events 3766 * long presses. 3767 * 3768 * @see #setHapticFeedbackEnabled(boolean) 3769 * @see #performHapticFeedback(int) 3770 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3771 */ 3772 @ViewDebug.ExportedProperty 3773 public boolean isHapticFeedbackEnabled() { 3774 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3775 } 3776 3777 /** 3778 * If this view doesn't do any drawing on its own, set this flag to 3779 * allow further optimizations. By default, this flag is not set on 3780 * View, but could be set on some View subclasses such as ViewGroup. 3781 * 3782 * Typically, if you override {@link #onDraw} you should clear this flag. 3783 * 3784 * @param willNotDraw whether or not this View draw on its own 3785 */ 3786 public void setWillNotDraw(boolean willNotDraw) { 3787 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3788 } 3789 3790 /** 3791 * Returns whether or not this View draws on its own. 3792 * 3793 * @return true if this view has nothing to draw, false otherwise 3794 */ 3795 @ViewDebug.ExportedProperty(category = "drawing") 3796 public boolean willNotDraw() { 3797 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3798 } 3799 3800 /** 3801 * When a View's drawing cache is enabled, drawing is redirected to an 3802 * offscreen bitmap. Some views, like an ImageView, must be able to 3803 * bypass this mechanism if they already draw a single bitmap, to avoid 3804 * unnecessary usage of the memory. 3805 * 3806 * @param willNotCacheDrawing true if this view does not cache its 3807 * drawing, false otherwise 3808 */ 3809 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3810 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3811 } 3812 3813 /** 3814 * Returns whether or not this View can cache its drawing or not. 3815 * 3816 * @return true if this view does not cache its drawing, false otherwise 3817 */ 3818 @ViewDebug.ExportedProperty(category = "drawing") 3819 public boolean willNotCacheDrawing() { 3820 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3821 } 3822 3823 /** 3824 * Indicates whether this view reacts to click events or not. 3825 * 3826 * @return true if the view is clickable, false otherwise 3827 * 3828 * @see #setClickable(boolean) 3829 * @attr ref android.R.styleable#View_clickable 3830 */ 3831 @ViewDebug.ExportedProperty 3832 public boolean isClickable() { 3833 return (mViewFlags & CLICKABLE) == CLICKABLE; 3834 } 3835 3836 /** 3837 * Enables or disables click events for this view. When a view 3838 * is clickable it will change its state to "pressed" on every click. 3839 * Subclasses should set the view clickable to visually react to 3840 * user's clicks. 3841 * 3842 * @param clickable true to make the view clickable, false otherwise 3843 * 3844 * @see #isClickable() 3845 * @attr ref android.R.styleable#View_clickable 3846 */ 3847 public void setClickable(boolean clickable) { 3848 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3849 } 3850 3851 /** 3852 * Indicates whether this view reacts to long click events or not. 3853 * 3854 * @return true if the view is long clickable, false otherwise 3855 * 3856 * @see #setLongClickable(boolean) 3857 * @attr ref android.R.styleable#View_longClickable 3858 */ 3859 public boolean isLongClickable() { 3860 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 3861 } 3862 3863 /** 3864 * Enables or disables long click events for this view. When a view is long 3865 * clickable it reacts to the user holding down the button for a longer 3866 * duration than a tap. This event can either launch the listener or a 3867 * context menu. 3868 * 3869 * @param longClickable true to make the view long clickable, false otherwise 3870 * @see #isLongClickable() 3871 * @attr ref android.R.styleable#View_longClickable 3872 */ 3873 public void setLongClickable(boolean longClickable) { 3874 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 3875 } 3876 3877 /** 3878 * Sets the pressed state for this view. 3879 * 3880 * @see #isClickable() 3881 * @see #setClickable(boolean) 3882 * 3883 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 3884 * the View's internal state from a previously set "pressed" state. 3885 */ 3886 public void setPressed(boolean pressed) { 3887 if (pressed) { 3888 mPrivateFlags |= PRESSED; 3889 } else { 3890 mPrivateFlags &= ~PRESSED; 3891 } 3892 refreshDrawableState(); 3893 dispatchSetPressed(pressed); 3894 } 3895 3896 /** 3897 * Dispatch setPressed to all of this View's children. 3898 * 3899 * @see #setPressed(boolean) 3900 * 3901 * @param pressed The new pressed state 3902 */ 3903 protected void dispatchSetPressed(boolean pressed) { 3904 } 3905 3906 /** 3907 * Indicates whether the view is currently in pressed state. Unless 3908 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 3909 * the pressed state. 3910 * 3911 * @see #setPressed 3912 * @see #isClickable() 3913 * @see #setClickable(boolean) 3914 * 3915 * @return true if the view is currently pressed, false otherwise 3916 */ 3917 public boolean isPressed() { 3918 return (mPrivateFlags & PRESSED) == PRESSED; 3919 } 3920 3921 /** 3922 * Indicates whether this view will save its state (that is, 3923 * whether its {@link #onSaveInstanceState} method will be called). 3924 * 3925 * @return Returns true if the view state saving is enabled, else false. 3926 * 3927 * @see #setSaveEnabled(boolean) 3928 * @attr ref android.R.styleable#View_saveEnabled 3929 */ 3930 public boolean isSaveEnabled() { 3931 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 3932 } 3933 3934 /** 3935 * Controls whether the saving of this view's state is 3936 * enabled (that is, whether its {@link #onSaveInstanceState} method 3937 * will be called). Note that even if freezing is enabled, the 3938 * view still must have an id assigned to it (via {@link #setId setId()}) 3939 * for its state to be saved. This flag can only disable the 3940 * saving of this view; any child views may still have their state saved. 3941 * 3942 * @param enabled Set to false to <em>disable</em> state saving, or true 3943 * (the default) to allow it. 3944 * 3945 * @see #isSaveEnabled() 3946 * @see #setId(int) 3947 * @see #onSaveInstanceState() 3948 * @attr ref android.R.styleable#View_saveEnabled 3949 */ 3950 public void setSaveEnabled(boolean enabled) { 3951 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 3952 } 3953 3954 /** 3955 * Gets whether the framework should discard touches when the view's 3956 * window is obscured by another visible window. 3957 * Refer to the {@link View} security documentation for more details. 3958 * 3959 * @return True if touch filtering is enabled. 3960 * 3961 * @see #setFilterTouchesWhenObscured(boolean) 3962 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3963 */ 3964 @ViewDebug.ExportedProperty 3965 public boolean getFilterTouchesWhenObscured() { 3966 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 3967 } 3968 3969 /** 3970 * Sets whether the framework should discard touches when the view's 3971 * window is obscured by another visible window. 3972 * Refer to the {@link View} security documentation for more details. 3973 * 3974 * @param enabled True if touch filtering should be enabled. 3975 * 3976 * @see #getFilterTouchesWhenObscured 3977 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3978 */ 3979 public void setFilterTouchesWhenObscured(boolean enabled) { 3980 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 3981 FILTER_TOUCHES_WHEN_OBSCURED); 3982 } 3983 3984 /** 3985 * Indicates whether the entire hierarchy under this view will save its 3986 * state when a state saving traversal occurs from its parent. The default 3987 * is true; if false, these views will not be saved unless 3988 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 3989 * 3990 * @return Returns true if the view state saving from parent is enabled, else false. 3991 * 3992 * @see #setSaveFromParentEnabled(boolean) 3993 */ 3994 public boolean isSaveFromParentEnabled() { 3995 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 3996 } 3997 3998 /** 3999 * Controls whether the entire hierarchy under this view will save its 4000 * state when a state saving traversal occurs from its parent. The default 4001 * is true; if false, these views will not be saved unless 4002 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4003 * 4004 * @param enabled Set to false to <em>disable</em> state saving, or true 4005 * (the default) to allow it. 4006 * 4007 * @see #isSaveFromParentEnabled() 4008 * @see #setId(int) 4009 * @see #onSaveInstanceState() 4010 */ 4011 public void setSaveFromParentEnabled(boolean enabled) { 4012 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4013 } 4014 4015 4016 /** 4017 * Returns whether this View is able to take focus. 4018 * 4019 * @return True if this view can take focus, or false otherwise. 4020 * @attr ref android.R.styleable#View_focusable 4021 */ 4022 @ViewDebug.ExportedProperty(category = "focus") 4023 public final boolean isFocusable() { 4024 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4025 } 4026 4027 /** 4028 * When a view is focusable, it may not want to take focus when in touch mode. 4029 * For example, a button would like focus when the user is navigating via a D-pad 4030 * so that the user can click on it, but once the user starts touching the screen, 4031 * the button shouldn't take focus 4032 * @return Whether the view is focusable in touch mode. 4033 * @attr ref android.R.styleable#View_focusableInTouchMode 4034 */ 4035 @ViewDebug.ExportedProperty 4036 public final boolean isFocusableInTouchMode() { 4037 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4038 } 4039 4040 /** 4041 * Find the nearest view in the specified direction that can take focus. 4042 * This does not actually give focus to that view. 4043 * 4044 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4045 * 4046 * @return The nearest focusable in the specified direction, or null if none 4047 * can be found. 4048 */ 4049 public View focusSearch(int direction) { 4050 if (mParent != null) { 4051 return mParent.focusSearch(this, direction); 4052 } else { 4053 return null; 4054 } 4055 } 4056 4057 /** 4058 * This method is the last chance for the focused view and its ancestors to 4059 * respond to an arrow key. This is called when the focused view did not 4060 * consume the key internally, nor could the view system find a new view in 4061 * the requested direction to give focus to. 4062 * 4063 * @param focused The currently focused view. 4064 * @param direction The direction focus wants to move. One of FOCUS_UP, 4065 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4066 * @return True if the this view consumed this unhandled move. 4067 */ 4068 public boolean dispatchUnhandledMove(View focused, int direction) { 4069 return false; 4070 } 4071 4072 /** 4073 * If a user manually specified the next view id for a particular direction, 4074 * use the root to look up the view. 4075 * @param root The root view of the hierarchy containing this view. 4076 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4077 * or FOCUS_BACKWARD. 4078 * @return The user specified next view, or null if there is none. 4079 */ 4080 View findUserSetNextFocus(View root, int direction) { 4081 switch (direction) { 4082 case FOCUS_LEFT: 4083 if (mNextFocusLeftId == View.NO_ID) return null; 4084 return findViewShouldExist(root, mNextFocusLeftId); 4085 case FOCUS_RIGHT: 4086 if (mNextFocusRightId == View.NO_ID) return null; 4087 return findViewShouldExist(root, mNextFocusRightId); 4088 case FOCUS_UP: 4089 if (mNextFocusUpId == View.NO_ID) return null; 4090 return findViewShouldExist(root, mNextFocusUpId); 4091 case FOCUS_DOWN: 4092 if (mNextFocusDownId == View.NO_ID) return null; 4093 return findViewShouldExist(root, mNextFocusDownId); 4094 case FOCUS_FORWARD: 4095 if (mNextFocusForwardId == View.NO_ID) return null; 4096 return findViewShouldExist(root, mNextFocusForwardId); 4097 case FOCUS_BACKWARD: { 4098 final int id = mID; 4099 return root.findViewByPredicate(new Predicate<View>() { 4100 @Override 4101 public boolean apply(View t) { 4102 return t.mNextFocusForwardId == id; 4103 } 4104 }); 4105 } 4106 } 4107 return null; 4108 } 4109 4110 private static View findViewShouldExist(View root, int childViewId) { 4111 View result = root.findViewById(childViewId); 4112 if (result == null) { 4113 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4114 + "by user for id " + childViewId); 4115 } 4116 return result; 4117 } 4118 4119 /** 4120 * Find and return all focusable views that are descendants of this view, 4121 * possibly including this view if it is focusable itself. 4122 * 4123 * @param direction The direction of the focus 4124 * @return A list of focusable views 4125 */ 4126 public ArrayList<View> getFocusables(int direction) { 4127 ArrayList<View> result = new ArrayList<View>(24); 4128 addFocusables(result, direction); 4129 return result; 4130 } 4131 4132 /** 4133 * Add any focusable views that are descendants of this view (possibly 4134 * including this view if it is focusable itself) to views. If we are in touch mode, 4135 * only add views that are also focusable in touch mode. 4136 * 4137 * @param views Focusable views found so far 4138 * @param direction The direction of the focus 4139 */ 4140 public void addFocusables(ArrayList<View> views, int direction) { 4141 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4142 } 4143 4144 /** 4145 * Adds any focusable views that are descendants of this view (possibly 4146 * including this view if it is focusable itself) to views. This method 4147 * adds all focusable views regardless if we are in touch mode or 4148 * only views focusable in touch mode if we are in touch mode depending on 4149 * the focusable mode paramater. 4150 * 4151 * @param views Focusable views found so far or null if all we are interested is 4152 * the number of focusables. 4153 * @param direction The direction of the focus. 4154 * @param focusableMode The type of focusables to be added. 4155 * 4156 * @see #FOCUSABLES_ALL 4157 * @see #FOCUSABLES_TOUCH_MODE 4158 */ 4159 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4160 if (!isFocusable()) { 4161 return; 4162 } 4163 4164 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4165 isInTouchMode() && !isFocusableInTouchMode()) { 4166 return; 4167 } 4168 4169 if (views != null) { 4170 views.add(this); 4171 } 4172 } 4173 4174 /** 4175 * Find and return all touchable views that are descendants of this view, 4176 * possibly including this view if it is touchable itself. 4177 * 4178 * @return A list of touchable views 4179 */ 4180 public ArrayList<View> getTouchables() { 4181 ArrayList<View> result = new ArrayList<View>(); 4182 addTouchables(result); 4183 return result; 4184 } 4185 4186 /** 4187 * Add any touchable views that are descendants of this view (possibly 4188 * including this view if it is touchable itself) to views. 4189 * 4190 * @param views Touchable views found so far 4191 */ 4192 public void addTouchables(ArrayList<View> views) { 4193 final int viewFlags = mViewFlags; 4194 4195 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4196 && (viewFlags & ENABLED_MASK) == ENABLED) { 4197 views.add(this); 4198 } 4199 } 4200 4201 /** 4202 * Call this to try to give focus to a specific view or to one of its 4203 * descendants. 4204 * 4205 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4206 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4207 * while the device is in touch mode. 4208 * 4209 * See also {@link #focusSearch}, which is what you call to say that you 4210 * have focus, and you want your parent to look for the next one. 4211 * 4212 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4213 * {@link #FOCUS_DOWN} and <code>null</code>. 4214 * 4215 * @return Whether this view or one of its descendants actually took focus. 4216 */ 4217 public final boolean requestFocus() { 4218 return requestFocus(View.FOCUS_DOWN); 4219 } 4220 4221 4222 /** 4223 * Call this to try to give focus to a specific view or to one of its 4224 * descendants and give it a hint about what direction focus is heading. 4225 * 4226 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4227 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4228 * while the device is in touch mode. 4229 * 4230 * See also {@link #focusSearch}, which is what you call to say that you 4231 * have focus, and you want your parent to look for the next one. 4232 * 4233 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4234 * <code>null</code> set for the previously focused rectangle. 4235 * 4236 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4237 * @return Whether this view or one of its descendants actually took focus. 4238 */ 4239 public final boolean requestFocus(int direction) { 4240 return requestFocus(direction, null); 4241 } 4242 4243 /** 4244 * Call this to try to give focus to a specific view or to one of its descendants 4245 * and give it hints about the direction and a specific rectangle that the focus 4246 * is coming from. The rectangle can help give larger views a finer grained hint 4247 * about where focus is coming from, and therefore, where to show selection, or 4248 * forward focus change internally. 4249 * 4250 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4251 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4252 * while the device is in touch mode. 4253 * 4254 * A View will not take focus if it is not visible. 4255 * 4256 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 4257 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4258 * 4259 * See also {@link #focusSearch}, which is what you call to say that you 4260 * have focus, and you want your parent to look for the next one. 4261 * 4262 * You may wish to override this method if your custom {@link View} has an internal 4263 * {@link View} that it wishes to forward the request to. 4264 * 4265 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4266 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4267 * to give a finer grained hint about where focus is coming from. May be null 4268 * if there is no hint. 4269 * @return Whether this view or one of its descendants actually took focus. 4270 */ 4271 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4272 // need to be focusable 4273 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4274 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4275 return false; 4276 } 4277 4278 // need to be focusable in touch mode if in touch mode 4279 if (isInTouchMode() && 4280 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4281 return false; 4282 } 4283 4284 // need to not have any parents blocking us 4285 if (hasAncestorThatBlocksDescendantFocus()) { 4286 return false; 4287 } 4288 4289 handleFocusGainInternal(direction, previouslyFocusedRect); 4290 return true; 4291 } 4292 4293 /** Gets the ViewRoot, or null if not attached. */ 4294 /*package*/ ViewRoot getViewRoot() { 4295 View root = getRootView(); 4296 return root != null ? (ViewRoot)root.getParent() : null; 4297 } 4298 4299 /** 4300 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4301 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4302 * touch mode to request focus when they are touched. 4303 * 4304 * @return Whether this view or one of its descendants actually took focus. 4305 * 4306 * @see #isInTouchMode() 4307 * 4308 */ 4309 public final boolean requestFocusFromTouch() { 4310 // Leave touch mode if we need to 4311 if (isInTouchMode()) { 4312 ViewRoot viewRoot = getViewRoot(); 4313 if (viewRoot != null) { 4314 viewRoot.ensureTouchMode(false); 4315 } 4316 } 4317 return requestFocus(View.FOCUS_DOWN); 4318 } 4319 4320 /** 4321 * @return Whether any ancestor of this view blocks descendant focus. 4322 */ 4323 private boolean hasAncestorThatBlocksDescendantFocus() { 4324 ViewParent ancestor = mParent; 4325 while (ancestor instanceof ViewGroup) { 4326 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4327 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4328 return true; 4329 } else { 4330 ancestor = vgAncestor.getParent(); 4331 } 4332 } 4333 return false; 4334 } 4335 4336 /** 4337 * @hide 4338 */ 4339 public void dispatchStartTemporaryDetach() { 4340 onStartTemporaryDetach(); 4341 } 4342 4343 /** 4344 * This is called when a container is going to temporarily detach a child, with 4345 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4346 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4347 * {@link #onDetachedFromWindow()} when the container is done. 4348 */ 4349 public void onStartTemporaryDetach() { 4350 removeUnsetPressCallback(); 4351 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4352 } 4353 4354 /** 4355 * @hide 4356 */ 4357 public void dispatchFinishTemporaryDetach() { 4358 onFinishTemporaryDetach(); 4359 } 4360 4361 /** 4362 * Called after {@link #onStartTemporaryDetach} when the container is done 4363 * changing the view. 4364 */ 4365 public void onFinishTemporaryDetach() { 4366 } 4367 4368 /** 4369 * capture information of this view for later analysis: developement only 4370 * check dynamic switch to make sure we only dump view 4371 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4372 */ 4373 private static void captureViewInfo(String subTag, View v) { 4374 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4375 return; 4376 } 4377 ViewDebug.dumpCapturedView(subTag, v); 4378 } 4379 4380 /** 4381 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4382 * for this view's window. Returns null if the view is not currently attached 4383 * to the window. Normally you will not need to use this directly, but 4384 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4385 */ 4386 public KeyEvent.DispatcherState getKeyDispatcherState() { 4387 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4388 } 4389 4390 /** 4391 * Dispatch a key event before it is processed by any input method 4392 * associated with the view hierarchy. This can be used to intercept 4393 * key events in special situations before the IME consumes them; a 4394 * typical example would be handling the BACK key to update the application's 4395 * UI instead of allowing the IME to see it and close itself. 4396 * 4397 * @param event The key event to be dispatched. 4398 * @return True if the event was handled, false otherwise. 4399 */ 4400 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4401 return onKeyPreIme(event.getKeyCode(), event); 4402 } 4403 4404 /** 4405 * Dispatch a key event to the next view on the focus path. This path runs 4406 * from the top of the view tree down to the currently focused view. If this 4407 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4408 * the next node down the focus path. This method also fires any key 4409 * listeners. 4410 * 4411 * @param event The key event to be dispatched. 4412 * @return True if the event was handled, false otherwise. 4413 */ 4414 public boolean dispatchKeyEvent(KeyEvent event) { 4415 // If any attached key listener a first crack at the event. 4416 4417 //noinspection SimplifiableIfStatement,deprecation 4418 if (android.util.Config.LOGV) { 4419 captureViewInfo("captureViewKeyEvent", this); 4420 } 4421 4422 //noinspection SimplifiableIfStatement 4423 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4424 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4425 return true; 4426 } 4427 4428 return event.dispatch(this, mAttachInfo != null 4429 ? mAttachInfo.mKeyDispatchState : null, this); 4430 } 4431 4432 /** 4433 * Dispatches a key shortcut event. 4434 * 4435 * @param event The key event to be dispatched. 4436 * @return True if the event was handled by the view, false otherwise. 4437 */ 4438 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4439 return onKeyShortcut(event.getKeyCode(), event); 4440 } 4441 4442 /** 4443 * Pass the touch screen motion event down to the target view, or this 4444 * view if it is the target. 4445 * 4446 * @param event The motion event to be dispatched. 4447 * @return True if the event was handled by the view, false otherwise. 4448 */ 4449 public boolean dispatchTouchEvent(MotionEvent event) { 4450 if (!onFilterTouchEventForSecurity(event)) { 4451 return false; 4452 } 4453 4454 //noinspection SimplifiableIfStatement 4455 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4456 mOnTouchListener.onTouch(this, event)) { 4457 return true; 4458 } 4459 return onTouchEvent(event); 4460 } 4461 4462 /** 4463 * Filter the touch event to apply security policies. 4464 * 4465 * @param event The motion event to be filtered. 4466 * @return True if the event should be dispatched, false if the event should be dropped. 4467 * 4468 * @see #getFilterTouchesWhenObscured 4469 */ 4470 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4471 //noinspection RedundantIfStatement 4472 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4473 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4474 // Window is obscured, drop this touch. 4475 return false; 4476 } 4477 return true; 4478 } 4479 4480 /** 4481 * Pass a trackball motion event down to the focused view. 4482 * 4483 * @param event The motion event to be dispatched. 4484 * @return True if the event was handled by the view, false otherwise. 4485 */ 4486 public boolean dispatchTrackballEvent(MotionEvent event) { 4487 //Log.i("view", "view=" + this + ", " + event.toString()); 4488 return onTrackballEvent(event); 4489 } 4490 4491 /** 4492 * Called when the window containing this view gains or loses window focus. 4493 * ViewGroups should override to route to their children. 4494 * 4495 * @param hasFocus True if the window containing this view now has focus, 4496 * false otherwise. 4497 */ 4498 public void dispatchWindowFocusChanged(boolean hasFocus) { 4499 onWindowFocusChanged(hasFocus); 4500 } 4501 4502 /** 4503 * Called when the window containing this view gains or loses focus. Note 4504 * that this is separate from view focus: to receive key events, both 4505 * your view and its window must have focus. If a window is displayed 4506 * on top of yours that takes input focus, then your own window will lose 4507 * focus but the view focus will remain unchanged. 4508 * 4509 * @param hasWindowFocus True if the window containing this view now has 4510 * focus, false otherwise. 4511 */ 4512 public void onWindowFocusChanged(boolean hasWindowFocus) { 4513 InputMethodManager imm = InputMethodManager.peekInstance(); 4514 if (!hasWindowFocus) { 4515 if (isPressed()) { 4516 setPressed(false); 4517 } 4518 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4519 imm.focusOut(this); 4520 } 4521 removeLongPressCallback(); 4522 removeTapCallback(); 4523 onFocusLost(); 4524 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4525 imm.focusIn(this); 4526 } 4527 refreshDrawableState(); 4528 } 4529 4530 /** 4531 * Returns true if this view is in a window that currently has window focus. 4532 * Note that this is not the same as the view itself having focus. 4533 * 4534 * @return True if this view is in a window that currently has window focus. 4535 */ 4536 public boolean hasWindowFocus() { 4537 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4538 } 4539 4540 /** 4541 * Dispatch a view visibility change down the view hierarchy. 4542 * ViewGroups should override to route to their children. 4543 * @param changedView The view whose visibility changed. Could be 'this' or 4544 * an ancestor view. 4545 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4546 * {@link #INVISIBLE} or {@link #GONE}. 4547 */ 4548 protected void dispatchVisibilityChanged(View changedView, int visibility) { 4549 onVisibilityChanged(changedView, visibility); 4550 } 4551 4552 /** 4553 * Called when the visibility of the view or an ancestor of the view is changed. 4554 * @param changedView The view whose visibility changed. Could be 'this' or 4555 * an ancestor view. 4556 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4557 * {@link #INVISIBLE} or {@link #GONE}. 4558 */ 4559 protected void onVisibilityChanged(View changedView, int visibility) { 4560 if (visibility == VISIBLE) { 4561 if (mAttachInfo != null) { 4562 initialAwakenScrollBars(); 4563 } else { 4564 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4565 } 4566 } 4567 } 4568 4569 /** 4570 * Dispatch a hint about whether this view is displayed. For instance, when 4571 * a View moves out of the screen, it might receives a display hint indicating 4572 * the view is not displayed. Applications should not <em>rely</em> on this hint 4573 * as there is no guarantee that they will receive one. 4574 * 4575 * @param hint A hint about whether or not this view is displayed: 4576 * {@link #VISIBLE} or {@link #INVISIBLE}. 4577 */ 4578 public void dispatchDisplayHint(int hint) { 4579 onDisplayHint(hint); 4580 } 4581 4582 /** 4583 * Gives this view a hint about whether is displayed or not. For instance, when 4584 * a View moves out of the screen, it might receives a display hint indicating 4585 * the view is not displayed. Applications should not <em>rely</em> on this hint 4586 * as there is no guarantee that they will receive one. 4587 * 4588 * @param hint A hint about whether or not this view is displayed: 4589 * {@link #VISIBLE} or {@link #INVISIBLE}. 4590 */ 4591 protected void onDisplayHint(int hint) { 4592 } 4593 4594 /** 4595 * Dispatch a window visibility change down the view hierarchy. 4596 * ViewGroups should override to route to their children. 4597 * 4598 * @param visibility The new visibility of the window. 4599 * 4600 * @see #onWindowVisibilityChanged 4601 */ 4602 public void dispatchWindowVisibilityChanged(int visibility) { 4603 onWindowVisibilityChanged(visibility); 4604 } 4605 4606 /** 4607 * Called when the window containing has change its visibility 4608 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4609 * that this tells you whether or not your window is being made visible 4610 * to the window manager; this does <em>not</em> tell you whether or not 4611 * your window is obscured by other windows on the screen, even if it 4612 * is itself visible. 4613 * 4614 * @param visibility The new visibility of the window. 4615 */ 4616 protected void onWindowVisibilityChanged(int visibility) { 4617 if (visibility == VISIBLE) { 4618 initialAwakenScrollBars(); 4619 } 4620 } 4621 4622 /** 4623 * Returns the current visibility of the window this view is attached to 4624 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4625 * 4626 * @return Returns the current visibility of the view's window. 4627 */ 4628 public int getWindowVisibility() { 4629 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4630 } 4631 4632 /** 4633 * Retrieve the overall visible display size in which the window this view is 4634 * attached to has been positioned in. This takes into account screen 4635 * decorations above the window, for both cases where the window itself 4636 * is being position inside of them or the window is being placed under 4637 * then and covered insets are used for the window to position its content 4638 * inside. In effect, this tells you the available area where content can 4639 * be placed and remain visible to users. 4640 * 4641 * <p>This function requires an IPC back to the window manager to retrieve 4642 * the requested information, so should not be used in performance critical 4643 * code like drawing. 4644 * 4645 * @param outRect Filled in with the visible display frame. If the view 4646 * is not attached to a window, this is simply the raw display size. 4647 */ 4648 public void getWindowVisibleDisplayFrame(Rect outRect) { 4649 if (mAttachInfo != null) { 4650 try { 4651 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4652 } catch (RemoteException e) { 4653 return; 4654 } 4655 // XXX This is really broken, and probably all needs to be done 4656 // in the window manager, and we need to know more about whether 4657 // we want the area behind or in front of the IME. 4658 final Rect insets = mAttachInfo.mVisibleInsets; 4659 outRect.left += insets.left; 4660 outRect.top += insets.top; 4661 outRect.right -= insets.right; 4662 outRect.bottom -= insets.bottom; 4663 return; 4664 } 4665 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4666 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4667 } 4668 4669 /** 4670 * Dispatch a notification about a resource configuration change down 4671 * the view hierarchy. 4672 * ViewGroups should override to route to their children. 4673 * 4674 * @param newConfig The new resource configuration. 4675 * 4676 * @see #onConfigurationChanged 4677 */ 4678 public void dispatchConfigurationChanged(Configuration newConfig) { 4679 onConfigurationChanged(newConfig); 4680 } 4681 4682 /** 4683 * Called when the current configuration of the resources being used 4684 * by the application have changed. You can use this to decide when 4685 * to reload resources that can changed based on orientation and other 4686 * configuration characterstics. You only need to use this if you are 4687 * not relying on the normal {@link android.app.Activity} mechanism of 4688 * recreating the activity instance upon a configuration change. 4689 * 4690 * @param newConfig The new resource configuration. 4691 */ 4692 protected void onConfigurationChanged(Configuration newConfig) { 4693 } 4694 4695 /** 4696 * Private function to aggregate all per-view attributes in to the view 4697 * root. 4698 */ 4699 void dispatchCollectViewAttributes(int visibility) { 4700 performCollectViewAttributes(visibility); 4701 } 4702 4703 void performCollectViewAttributes(int visibility) { 4704 //noinspection PointlessBitwiseExpression 4705 if (((visibility | mViewFlags) & (VISIBILITY_MASK | KEEP_SCREEN_ON)) 4706 == (VISIBLE | KEEP_SCREEN_ON)) { 4707 mAttachInfo.mKeepScreenOn = true; 4708 } 4709 } 4710 4711 void needGlobalAttributesUpdate(boolean force) { 4712 AttachInfo ai = mAttachInfo; 4713 if (ai != null) { 4714 if (ai.mKeepScreenOn || force) { 4715 ai.mRecomputeGlobalAttributes = true; 4716 } 4717 } 4718 } 4719 4720 /** 4721 * Returns whether the device is currently in touch mode. Touch mode is entered 4722 * once the user begins interacting with the device by touch, and affects various 4723 * things like whether focus is always visible to the user. 4724 * 4725 * @return Whether the device is in touch mode. 4726 */ 4727 @ViewDebug.ExportedProperty 4728 public boolean isInTouchMode() { 4729 if (mAttachInfo != null) { 4730 return mAttachInfo.mInTouchMode; 4731 } else { 4732 return ViewRoot.isInTouchMode(); 4733 } 4734 } 4735 4736 /** 4737 * Returns the context the view is running in, through which it can 4738 * access the current theme, resources, etc. 4739 * 4740 * @return The view's Context. 4741 */ 4742 @ViewDebug.CapturedViewProperty 4743 public final Context getContext() { 4744 return mContext; 4745 } 4746 4747 /** 4748 * Handle a key event before it is processed by any input method 4749 * associated with the view hierarchy. This can be used to intercept 4750 * key events in special situations before the IME consumes them; a 4751 * typical example would be handling the BACK key to update the application's 4752 * UI instead of allowing the IME to see it and close itself. 4753 * 4754 * @param keyCode The value in event.getKeyCode(). 4755 * @param event Description of the key event. 4756 * @return If you handled the event, return true. If you want to allow the 4757 * event to be handled by the next receiver, return false. 4758 */ 4759 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4760 return false; 4761 } 4762 4763 /** 4764 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 4765 * KeyEvent.Callback.onKeyDown()}: perform press of the view 4766 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4767 * is released, if the view is enabled and clickable. 4768 * 4769 * @param keyCode A key code that represents the button pressed, from 4770 * {@link android.view.KeyEvent}. 4771 * @param event The KeyEvent object that defines the button action. 4772 */ 4773 public boolean onKeyDown(int keyCode, KeyEvent event) { 4774 boolean result = false; 4775 4776 switch (keyCode) { 4777 case KeyEvent.KEYCODE_DPAD_CENTER: 4778 case KeyEvent.KEYCODE_ENTER: { 4779 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4780 return true; 4781 } 4782 // Long clickable items don't necessarily have to be clickable 4783 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4784 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4785 (event.getRepeatCount() == 0)) { 4786 setPressed(true); 4787 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4788 postCheckForLongClick(0); 4789 } 4790 return true; 4791 } 4792 break; 4793 } 4794 } 4795 return result; 4796 } 4797 4798 /** 4799 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4800 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4801 * the event). 4802 */ 4803 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 4804 return false; 4805 } 4806 4807 /** 4808 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 4809 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 4810 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 4811 * {@link KeyEvent#KEYCODE_ENTER} is released. 4812 * 4813 * @param keyCode A key code that represents the button pressed, from 4814 * {@link android.view.KeyEvent}. 4815 * @param event The KeyEvent object that defines the button action. 4816 */ 4817 public boolean onKeyUp(int keyCode, KeyEvent event) { 4818 boolean result = false; 4819 4820 switch (keyCode) { 4821 case KeyEvent.KEYCODE_DPAD_CENTER: 4822 case KeyEvent.KEYCODE_ENTER: { 4823 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4824 return true; 4825 } 4826 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 4827 setPressed(false); 4828 4829 if (!mHasPerformedLongPress) { 4830 // This is a tap, so remove the longpress check 4831 removeLongPressCallback(); 4832 4833 result = performClick(); 4834 } 4835 } 4836 break; 4837 } 4838 } 4839 return result; 4840 } 4841 4842 /** 4843 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4844 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 4845 * the event). 4846 * 4847 * @param keyCode A key code that represents the button pressed, from 4848 * {@link android.view.KeyEvent}. 4849 * @param repeatCount The number of times the action was made. 4850 * @param event The KeyEvent object that defines the button action. 4851 */ 4852 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 4853 return false; 4854 } 4855 4856 /** 4857 * Called on the focused view when a key shortcut event is not handled. 4858 * Override this method to implement local key shortcuts for the View. 4859 * Key shortcuts can also be implemented by setting the 4860 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 4861 * 4862 * @param keyCode The value in event.getKeyCode(). 4863 * @param event Description of the key event. 4864 * @return If you handled the event, return true. If you want to allow the 4865 * event to be handled by the next receiver, return false. 4866 */ 4867 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 4868 return false; 4869 } 4870 4871 /** 4872 * Check whether the called view is a text editor, in which case it 4873 * would make sense to automatically display a soft input window for 4874 * it. Subclasses should override this if they implement 4875 * {@link #onCreateInputConnection(EditorInfo)} to return true if 4876 * a call on that method would return a non-null InputConnection, and 4877 * they are really a first-class editor that the user would normally 4878 * start typing on when the go into a window containing your view. 4879 * 4880 * <p>The default implementation always returns false. This does 4881 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 4882 * will not be called or the user can not otherwise perform edits on your 4883 * view; it is just a hint to the system that this is not the primary 4884 * purpose of this view. 4885 * 4886 * @return Returns true if this view is a text editor, else false. 4887 */ 4888 public boolean onCheckIsTextEditor() { 4889 return false; 4890 } 4891 4892 /** 4893 * Create a new InputConnection for an InputMethod to interact 4894 * with the view. The default implementation returns null, since it doesn't 4895 * support input methods. You can override this to implement such support. 4896 * This is only needed for views that take focus and text input. 4897 * 4898 * <p>When implementing this, you probably also want to implement 4899 * {@link #onCheckIsTextEditor()} to indicate you will return a 4900 * non-null InputConnection. 4901 * 4902 * @param outAttrs Fill in with attribute information about the connection. 4903 */ 4904 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 4905 return null; 4906 } 4907 4908 /** 4909 * Called by the {@link android.view.inputmethod.InputMethodManager} 4910 * when a view who is not the current 4911 * input connection target is trying to make a call on the manager. The 4912 * default implementation returns false; you can override this to return 4913 * true for certain views if you are performing InputConnection proxying 4914 * to them. 4915 * @param view The View that is making the InputMethodManager call. 4916 * @return Return true to allow the call, false to reject. 4917 */ 4918 public boolean checkInputConnectionProxy(View view) { 4919 return false; 4920 } 4921 4922 /** 4923 * Show the context menu for this view. It is not safe to hold on to the 4924 * menu after returning from this method. 4925 * 4926 * You should normally not overload this method. Overload 4927 * {@link #onCreateContextMenu(ContextMenu)} or define an 4928 * {@link OnCreateContextMenuListener} to add items to the context menu. 4929 * 4930 * @param menu The context menu to populate 4931 */ 4932 public void createContextMenu(ContextMenu menu) { 4933 ContextMenuInfo menuInfo = getContextMenuInfo(); 4934 4935 // Sets the current menu info so all items added to menu will have 4936 // my extra info set. 4937 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 4938 4939 onCreateContextMenu(menu); 4940 if (mOnCreateContextMenuListener != null) { 4941 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 4942 } 4943 4944 // Clear the extra information so subsequent items that aren't mine don't 4945 // have my extra info. 4946 ((MenuBuilder)menu).setCurrentMenuInfo(null); 4947 4948 if (mParent != null) { 4949 mParent.createContextMenu(menu); 4950 } 4951 } 4952 4953 /** 4954 * Views should implement this if they have extra information to associate 4955 * with the context menu. The return result is supplied as a parameter to 4956 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 4957 * callback. 4958 * 4959 * @return Extra information about the item for which the context menu 4960 * should be shown. This information will vary across different 4961 * subclasses of View. 4962 */ 4963 protected ContextMenuInfo getContextMenuInfo() { 4964 return null; 4965 } 4966 4967 /** 4968 * Views should implement this if the view itself is going to add items to 4969 * the context menu. 4970 * 4971 * @param menu the context menu to populate 4972 */ 4973 protected void onCreateContextMenu(ContextMenu menu) { 4974 } 4975 4976 /** 4977 * Implement this method to handle trackball motion events. The 4978 * <em>relative</em> movement of the trackball since the last event 4979 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 4980 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 4981 * that a movement of 1 corresponds to the user pressing one DPAD key (so 4982 * they will often be fractional values, representing the more fine-grained 4983 * movement information available from a trackball). 4984 * 4985 * @param event The motion event. 4986 * @return True if the event was handled, false otherwise. 4987 */ 4988 public boolean onTrackballEvent(MotionEvent event) { 4989 return false; 4990 } 4991 4992 /** 4993 * Implement this method to handle touch screen motion events. 4994 * 4995 * @param event The motion event. 4996 * @return True if the event was handled, false otherwise. 4997 */ 4998 public boolean onTouchEvent(MotionEvent event) { 4999 final int viewFlags = mViewFlags; 5000 5001 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5002 // A disabled view that is clickable still consumes the touch 5003 // events, it just doesn't respond to them. 5004 return (((viewFlags & CLICKABLE) == CLICKABLE || 5005 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5006 } 5007 5008 if (mTouchDelegate != null) { 5009 if (mTouchDelegate.onTouchEvent(event)) { 5010 return true; 5011 } 5012 } 5013 5014 if (((viewFlags & CLICKABLE) == CLICKABLE || 5015 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5016 switch (event.getAction()) { 5017 case MotionEvent.ACTION_UP: 5018 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5019 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5020 // take focus if we don't have it already and we should in 5021 // touch mode. 5022 boolean focusTaken = false; 5023 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5024 focusTaken = requestFocus(); 5025 } 5026 5027 if (!mHasPerformedLongPress) { 5028 // This is a tap, so remove the longpress check 5029 removeLongPressCallback(); 5030 5031 // Only perform take click actions if we were in the pressed state 5032 if (!focusTaken) { 5033 // Use a Runnable and post this rather than calling 5034 // performClick directly. This lets other visual state 5035 // of the view update before click actions start. 5036 if (mPerformClick == null) { 5037 mPerformClick = new PerformClick(); 5038 } 5039 if (!post(mPerformClick)) { 5040 performClick(); 5041 } 5042 } 5043 } 5044 5045 if (mUnsetPressedState == null) { 5046 mUnsetPressedState = new UnsetPressedState(); 5047 } 5048 5049 if (prepressed) { 5050 mPrivateFlags |= PRESSED; 5051 refreshDrawableState(); 5052 postDelayed(mUnsetPressedState, 5053 ViewConfiguration.getPressedStateDuration()); 5054 } else if (!post(mUnsetPressedState)) { 5055 // If the post failed, unpress right now 5056 mUnsetPressedState.run(); 5057 } 5058 removeTapCallback(); 5059 } 5060 break; 5061 5062 case MotionEvent.ACTION_DOWN: 5063 if (mPendingCheckForTap == null) { 5064 mPendingCheckForTap = new CheckForTap(); 5065 } 5066 mPrivateFlags |= PREPRESSED; 5067 mHasPerformedLongPress = false; 5068 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5069 break; 5070 5071 case MotionEvent.ACTION_CANCEL: 5072 mPrivateFlags &= ~PRESSED; 5073 refreshDrawableState(); 5074 removeTapCallback(); 5075 break; 5076 5077 case MotionEvent.ACTION_MOVE: 5078 final int x = (int) event.getX(); 5079 final int y = (int) event.getY(); 5080 5081 // Be lenient about moving outside of buttons 5082 if (!pointInView(x, y, mTouchSlop)) { 5083 // Outside button 5084 removeTapCallback(); 5085 if ((mPrivateFlags & PRESSED) != 0) { 5086 // Remove any future long press/tap checks 5087 removeLongPressCallback(); 5088 5089 // Need to switch from pressed to not pressed 5090 mPrivateFlags &= ~PRESSED; 5091 refreshDrawableState(); 5092 } 5093 } 5094 break; 5095 } 5096 return true; 5097 } 5098 5099 return false; 5100 } 5101 5102 /** 5103 * Remove the longpress detection timer. 5104 */ 5105 private void removeLongPressCallback() { 5106 if (mPendingCheckForLongPress != null) { 5107 removeCallbacks(mPendingCheckForLongPress); 5108 } 5109 } 5110 5111 /** 5112 * Remove the prepress detection timer. 5113 */ 5114 private void removeUnsetPressCallback() { 5115 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5116 setPressed(false); 5117 removeCallbacks(mUnsetPressedState); 5118 } 5119 } 5120 5121 /** 5122 * Remove the tap detection timer. 5123 */ 5124 private void removeTapCallback() { 5125 if (mPendingCheckForTap != null) { 5126 mPrivateFlags &= ~PREPRESSED; 5127 removeCallbacks(mPendingCheckForTap); 5128 } 5129 } 5130 5131 /** 5132 * Cancels a pending long press. Your subclass can use this if you 5133 * want the context menu to come up if the user presses and holds 5134 * at the same place, but you don't want it to come up if they press 5135 * and then move around enough to cause scrolling. 5136 */ 5137 public void cancelLongPress() { 5138 removeLongPressCallback(); 5139 5140 /* 5141 * The prepressed state handled by the tap callback is a display 5142 * construct, but the tap callback will post a long press callback 5143 * less its own timeout. Remove it here. 5144 */ 5145 removeTapCallback(); 5146 } 5147 5148 /** 5149 * Sets the TouchDelegate for this View. 5150 */ 5151 public void setTouchDelegate(TouchDelegate delegate) { 5152 mTouchDelegate = delegate; 5153 } 5154 5155 /** 5156 * Gets the TouchDelegate for this View. 5157 */ 5158 public TouchDelegate getTouchDelegate() { 5159 return mTouchDelegate; 5160 } 5161 5162 /** 5163 * Set flags controlling behavior of this view. 5164 * 5165 * @param flags Constant indicating the value which should be set 5166 * @param mask Constant indicating the bit range that should be changed 5167 */ 5168 void setFlags(int flags, int mask) { 5169 int old = mViewFlags; 5170 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5171 5172 int changed = mViewFlags ^ old; 5173 if (changed == 0) { 5174 return; 5175 } 5176 int privateFlags = mPrivateFlags; 5177 5178 /* Check if the FOCUSABLE bit has changed */ 5179 if (((changed & FOCUSABLE_MASK) != 0) && 5180 ((privateFlags & HAS_BOUNDS) !=0)) { 5181 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5182 && ((privateFlags & FOCUSED) != 0)) { 5183 /* Give up focus if we are no longer focusable */ 5184 clearFocus(); 5185 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 5186 && ((privateFlags & FOCUSED) == 0)) { 5187 /* 5188 * Tell the view system that we are now available to take focus 5189 * if no one else already has it. 5190 */ 5191 if (mParent != null) mParent.focusableViewAvailable(this); 5192 } 5193 } 5194 5195 if ((flags & VISIBILITY_MASK) == VISIBLE) { 5196 if ((changed & VISIBILITY_MASK) != 0) { 5197 /* 5198 * If this view is becoming visible, set the DRAWN flag so that 5199 * the next invalidate() will not be skipped. 5200 */ 5201 mPrivateFlags |= DRAWN; 5202 5203 needGlobalAttributesUpdate(true); 5204 5205 // a view becoming visible is worth notifying the parent 5206 // about in case nothing has focus. even if this specific view 5207 // isn't focusable, it may contain something that is, so let 5208 // the root view try to give this focus if nothing else does. 5209 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 5210 mParent.focusableViewAvailable(this); 5211 } 5212 } 5213 } 5214 5215 /* Check if the GONE bit has changed */ 5216 if ((changed & GONE) != 0) { 5217 needGlobalAttributesUpdate(false); 5218 requestLayout(); 5219 invalidate(); 5220 5221 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 5222 if (hasFocus()) clearFocus(); 5223 destroyDrawingCache(); 5224 } 5225 if (mAttachInfo != null) { 5226 mAttachInfo.mViewVisibilityChanged = true; 5227 } 5228 } 5229 5230 /* Check if the VISIBLE bit has changed */ 5231 if ((changed & INVISIBLE) != 0) { 5232 needGlobalAttributesUpdate(false); 5233 invalidate(); 5234 5235 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 5236 // root view becoming invisible shouldn't clear focus 5237 if (getRootView() != this) { 5238 clearFocus(); 5239 } 5240 } 5241 if (mAttachInfo != null) { 5242 mAttachInfo.mViewVisibilityChanged = true; 5243 } 5244 } 5245 5246 if ((changed & VISIBILITY_MASK) != 0) { 5247 if (mParent instanceof ViewGroup) { 5248 ((ViewGroup)mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5249 } 5250 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5251 } 5252 5253 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 5254 destroyDrawingCache(); 5255 } 5256 5257 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 5258 destroyDrawingCache(); 5259 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5260 } 5261 5262 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 5263 destroyDrawingCache(); 5264 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5265 } 5266 5267 if ((changed & DRAW_MASK) != 0) { 5268 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 5269 if (mBGDrawable != null) { 5270 mPrivateFlags &= ~SKIP_DRAW; 5271 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 5272 } else { 5273 mPrivateFlags |= SKIP_DRAW; 5274 } 5275 } else { 5276 mPrivateFlags &= ~SKIP_DRAW; 5277 } 5278 requestLayout(); 5279 invalidate(); 5280 } 5281 5282 if ((changed & KEEP_SCREEN_ON) != 0) { 5283 if (mParent != null) { 5284 mParent.recomputeViewAttributes(this); 5285 } 5286 } 5287 } 5288 5289 /** 5290 * Change the view's z order in the tree, so it's on top of other sibling 5291 * views 5292 */ 5293 public void bringToFront() { 5294 if (mParent != null) { 5295 mParent.bringChildToFront(this); 5296 } 5297 } 5298 5299 /** 5300 * This is called in response to an internal scroll in this view (i.e., the 5301 * view scrolled its own contents). This is typically as a result of 5302 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 5303 * called. 5304 * 5305 * @param l Current horizontal scroll origin. 5306 * @param t Current vertical scroll origin. 5307 * @param oldl Previous horizontal scroll origin. 5308 * @param oldt Previous vertical scroll origin. 5309 */ 5310 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 5311 mBackgroundSizeChanged = true; 5312 5313 final AttachInfo ai = mAttachInfo; 5314 if (ai != null) { 5315 ai.mViewScrollChanged = true; 5316 } 5317 } 5318 5319 /** 5320 * Interface definition for a callback to be invoked when the layout bounds of a view 5321 * changes due to layout processing. 5322 */ 5323 public interface OnLayoutChangeListener { 5324 /** 5325 * Called when the focus state of a view has changed. 5326 * 5327 * @param v The view whose state has changed. 5328 * @param left The new value of the view's left property. 5329 * @param top The new value of the view's top property. 5330 * @param right The new value of the view's right property. 5331 * @param bottom The new value of the view's bottom property. 5332 * @param oldLeft The previous value of the view's left property. 5333 * @param oldTop The previous value of the view's top property. 5334 * @param oldRight The previous value of the view's right property. 5335 * @param oldBottom The previous value of the view's bottom property. 5336 */ 5337 void onLayoutChange(View v, int left, int top, int right, int bottom, 5338 int oldLeft, int oldTop, int oldRight, int oldBottom); 5339 } 5340 5341 /** 5342 * This is called during layout when the size of this view has changed. If 5343 * you were just added to the view hierarchy, you're called with the old 5344 * values of 0. 5345 * 5346 * @param w Current width of this view. 5347 * @param h Current height of this view. 5348 * @param oldw Old width of this view. 5349 * @param oldh Old height of this view. 5350 */ 5351 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5352 } 5353 5354 /** 5355 * Called by draw to draw the child views. This may be overridden 5356 * by derived classes to gain control just before its children are drawn 5357 * (but after its own view has been drawn). 5358 * @param canvas the canvas on which to draw the view 5359 */ 5360 protected void dispatchDraw(Canvas canvas) { 5361 } 5362 5363 /** 5364 * Gets the parent of this view. Note that the parent is a 5365 * ViewParent and not necessarily a View. 5366 * 5367 * @return Parent of this view. 5368 */ 5369 public final ViewParent getParent() { 5370 return mParent; 5371 } 5372 5373 /** 5374 * Return the scrolled left position of this view. This is the left edge of 5375 * the displayed part of your view. You do not need to draw any pixels 5376 * farther left, since those are outside of the frame of your view on 5377 * screen. 5378 * 5379 * @return The left edge of the displayed part of your view, in pixels. 5380 */ 5381 public final int getScrollX() { 5382 return mScrollX; 5383 } 5384 5385 /** 5386 * Return the scrolled top position of this view. This is the top edge of 5387 * the displayed part of your view. You do not need to draw any pixels above 5388 * it, since those are outside of the frame of your view on screen. 5389 * 5390 * @return The top edge of the displayed part of your view, in pixels. 5391 */ 5392 public final int getScrollY() { 5393 return mScrollY; 5394 } 5395 5396 /** 5397 * Return the width of the your view. 5398 * 5399 * @return The width of your view, in pixels. 5400 */ 5401 @ViewDebug.ExportedProperty(category = "layout") 5402 public final int getWidth() { 5403 return mRight - mLeft; 5404 } 5405 5406 /** 5407 * Return the height of your view. 5408 * 5409 * @return The height of your view, in pixels. 5410 */ 5411 @ViewDebug.ExportedProperty(category = "layout") 5412 public final int getHeight() { 5413 return mBottom - mTop; 5414 } 5415 5416 /** 5417 * Return the visible drawing bounds of your view. Fills in the output 5418 * rectangle with the values from getScrollX(), getScrollY(), 5419 * getWidth(), and getHeight(). 5420 * 5421 * @param outRect The (scrolled) drawing bounds of the view. 5422 */ 5423 public void getDrawingRect(Rect outRect) { 5424 outRect.left = mScrollX; 5425 outRect.top = mScrollY; 5426 outRect.right = mScrollX + (mRight - mLeft); 5427 outRect.bottom = mScrollY + (mBottom - mTop); 5428 } 5429 5430 /** 5431 * Like {@link #getMeasuredWidthAndState()}, but only returns the 5432 * raw width component (that is the result is masked by 5433 * {@link #MEASURED_SIZE_MASK}). 5434 * 5435 * @return The raw measured width of this view. 5436 */ 5437 public final int getMeasuredWidth() { 5438 return mMeasuredWidth & MEASURED_SIZE_MASK; 5439 } 5440 5441 /** 5442 * Return the full width measurement information for this view as computed 5443 * by the most recent call to {@link #measure}. This result is a bit mask 5444 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5445 * This should be used during measurement and layout calculations only. Use 5446 * {@link #getWidth()} to see how wide a view is after layout. 5447 * 5448 * @return The measured width of this view as a bit mask. 5449 */ 5450 public final int getMeasuredWidthAndState() { 5451 return mMeasuredWidth; 5452 } 5453 5454 /** 5455 * Like {@link #getMeasuredHeightAndState()}, but only returns the 5456 * raw width component (that is the result is masked by 5457 * {@link #MEASURED_SIZE_MASK}). 5458 * 5459 * @return The raw measured height of this view. 5460 */ 5461 public final int getMeasuredHeight() { 5462 return mMeasuredHeight & MEASURED_SIZE_MASK; 5463 } 5464 5465 /** 5466 * Return the full height measurement information for this view as computed 5467 * by the most recent call to {@link #measure}. This result is a bit mask 5468 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5469 * This should be used during measurement and layout calculations only. Use 5470 * {@link #getHeight()} to see how wide a view is after layout. 5471 * 5472 * @return The measured width of this view as a bit mask. 5473 */ 5474 public final int getMeasuredHeightAndState() { 5475 return mMeasuredHeight; 5476 } 5477 5478 /** 5479 * Return only the state bits of {@link #getMeasuredWidthAndState()} 5480 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 5481 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 5482 * and the height component is at the shifted bits 5483 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 5484 */ 5485 public final int getMeasuredState() { 5486 return (mMeasuredWidth&MEASURED_STATE_MASK) 5487 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 5488 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 5489 } 5490 5491 /** 5492 * The transform matrix of this view, which is calculated based on the current 5493 * roation, scale, and pivot properties. 5494 * 5495 * @see #getRotation() 5496 * @see #getScaleX() 5497 * @see #getScaleY() 5498 * @see #getPivotX() 5499 * @see #getPivotY() 5500 * @return The current transform matrix for the view 5501 */ 5502 public Matrix getMatrix() { 5503 updateMatrix(); 5504 return mMatrix; 5505 } 5506 5507 /** 5508 * Utility function to determine if the value is far enough away from zero to be 5509 * considered non-zero. 5510 * @param value A floating point value to check for zero-ness 5511 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5512 */ 5513 private static boolean nonzero(float value) { 5514 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5515 } 5516 5517 /** 5518 * Returns true if the transform matrix is the identity matrix. 5519 * Recomputes the matrix if necessary. 5520 * 5521 * @return True if the transform matrix is the identity matrix, false otherwise. 5522 */ 5523 final boolean hasIdentityMatrix() { 5524 updateMatrix(); 5525 return mMatrixIsIdentity; 5526 } 5527 5528 /** 5529 * Recomputes the transform matrix if necessary. 5530 */ 5531 private void updateMatrix() { 5532 if (mMatrixDirty) { 5533 // transform-related properties have changed since the last time someone 5534 // asked for the matrix; recalculate it with the current values 5535 5536 // Figure out if we need to update the pivot point 5537 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5538 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 5539 mPrevWidth = mRight - mLeft; 5540 mPrevHeight = mBottom - mTop; 5541 mPivotX = mPrevWidth / 2f; 5542 mPivotY = mPrevHeight / 2f; 5543 } 5544 } 5545 mMatrix.reset(); 5546 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5547 mMatrix.setTranslate(mTranslationX, mTranslationY); 5548 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5549 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5550 } else { 5551 if (mCamera == null) { 5552 mCamera = new Camera(); 5553 matrix3D = new Matrix(); 5554 } 5555 mCamera.save(); 5556 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5557 mCamera.rotateX(mRotationX); 5558 mCamera.rotateY(mRotationY); 5559 mCamera.rotateZ(-mRotation); 5560 mCamera.getMatrix(matrix3D); 5561 matrix3D.preTranslate(-mPivotX, -mPivotY); 5562 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5563 mMatrix.postConcat(matrix3D); 5564 mCamera.restore(); 5565 } 5566 mMatrixDirty = false; 5567 mMatrixIsIdentity = mMatrix.isIdentity(); 5568 mInverseMatrixDirty = true; 5569 } 5570 } 5571 5572 /** 5573 * Utility method to retrieve the inverse of the current mMatrix property. 5574 * We cache the matrix to avoid recalculating it when transform properties 5575 * have not changed. 5576 * 5577 * @return The inverse of the current matrix of this view. 5578 */ 5579 final Matrix getInverseMatrix() { 5580 updateMatrix(); 5581 if (mInverseMatrixDirty) { 5582 if (mInverseMatrix == null) { 5583 mInverseMatrix = new Matrix(); 5584 } 5585 mMatrix.invert(mInverseMatrix); 5586 mInverseMatrixDirty = false; 5587 } 5588 return mInverseMatrix; 5589 } 5590 5591 /** 5592 * The degrees that the view is rotated around the pivot point. 5593 * 5594 * @see #getPivotX() 5595 * @see #getPivotY() 5596 * @return The degrees of rotation. 5597 */ 5598 public float getRotation() { 5599 return mRotation; 5600 } 5601 5602 /** 5603 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5604 * result in clockwise rotation. 5605 * 5606 * @param rotation The degrees of rotation. 5607 * @see #getPivotX() 5608 * @see #getPivotY() 5609 * 5610 * @attr ref android.R.styleable#View_rotation 5611 */ 5612 public void setRotation(float rotation) { 5613 if (mRotation != rotation) { 5614 // Double-invalidation is necessary to capture view's old and new areas 5615 invalidate(false); 5616 mRotation = rotation; 5617 mMatrixDirty = true; 5618 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5619 invalidate(false); 5620 } 5621 } 5622 5623 /** 5624 * The degrees that the view is rotated around the vertical axis through the pivot point. 5625 * 5626 * @see #getPivotX() 5627 * @see #getPivotY() 5628 * @return The degrees of Y rotation. 5629 */ 5630 public float getRotationY() { 5631 return mRotationY; 5632 } 5633 5634 /** 5635 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5636 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5637 * down the y axis. 5638 * 5639 * @param rotationY The degrees of Y rotation. 5640 * @see #getPivotX() 5641 * @see #getPivotY() 5642 * 5643 * @attr ref android.R.styleable#View_rotationY 5644 */ 5645 public void setRotationY(float rotationY) { 5646 if (mRotationY != rotationY) { 5647 // Double-invalidation is necessary to capture view's old and new areas 5648 invalidate(false); 5649 mRotationY = rotationY; 5650 mMatrixDirty = true; 5651 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5652 invalidate(false); 5653 } 5654 } 5655 5656 /** 5657 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5658 * 5659 * @see #getPivotX() 5660 * @see #getPivotY() 5661 * @return The degrees of X rotation. 5662 */ 5663 public float getRotationX() { 5664 return mRotationX; 5665 } 5666 5667 /** 5668 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 5669 * Increasing values result in clockwise rotation from the viewpoint of looking down the 5670 * x axis. 5671 * 5672 * @param rotationX The degrees of X rotation. 5673 * @see #getPivotX() 5674 * @see #getPivotY() 5675 * 5676 * @attr ref android.R.styleable#View_rotationX 5677 */ 5678 public void setRotationX(float rotationX) { 5679 if (mRotationX != rotationX) { 5680 // Double-invalidation is necessary to capture view's old and new areas 5681 invalidate(false); 5682 mRotationX = rotationX; 5683 mMatrixDirty = true; 5684 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5685 invalidate(false); 5686 } 5687 } 5688 5689 /** 5690 * The amount that the view is scaled in x around the pivot point, as a proportion of 5691 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 5692 * 5693 * <p>By default, this is 1.0f. 5694 * 5695 * @see #getPivotX() 5696 * @see #getPivotY() 5697 * @return The scaling factor. 5698 */ 5699 public float getScaleX() { 5700 return mScaleX; 5701 } 5702 5703 /** 5704 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 5705 * the view's unscaled width. A value of 1 means that no scaling is applied. 5706 * 5707 * @param scaleX The scaling factor. 5708 * @see #getPivotX() 5709 * @see #getPivotY() 5710 * 5711 * @attr ref android.R.styleable#View_scaleX 5712 */ 5713 public void setScaleX(float scaleX) { 5714 if (mScaleX != scaleX) { 5715 // Double-invalidation is necessary to capture view's old and new areas 5716 invalidate(false); 5717 mScaleX = scaleX; 5718 mMatrixDirty = true; 5719 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5720 invalidate(false); 5721 } 5722 } 5723 5724 /** 5725 * The amount that the view is scaled in y around the pivot point, as a proportion of 5726 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 5727 * 5728 * <p>By default, this is 1.0f. 5729 * 5730 * @see #getPivotX() 5731 * @see #getPivotY() 5732 * @return The scaling factor. 5733 */ 5734 public float getScaleY() { 5735 return mScaleY; 5736 } 5737 5738 /** 5739 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 5740 * the view's unscaled width. A value of 1 means that no scaling is applied. 5741 * 5742 * @param scaleY The scaling factor. 5743 * @see #getPivotX() 5744 * @see #getPivotY() 5745 * 5746 * @attr ref android.R.styleable#View_scaleY 5747 */ 5748 public void setScaleY(float scaleY) { 5749 if (mScaleY != scaleY) { 5750 // Double-invalidation is necessary to capture view's old and new areas 5751 invalidate(false); 5752 mScaleY = scaleY; 5753 mMatrixDirty = true; 5754 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5755 invalidate(false); 5756 } 5757 } 5758 5759 /** 5760 * The x location of the point around which the view is {@link #setRotation(float) rotated} 5761 * and {@link #setScaleX(float) scaled}. 5762 * 5763 * @see #getRotation() 5764 * @see #getScaleX() 5765 * @see #getScaleY() 5766 * @see #getPivotY() 5767 * @return The x location of the pivot point. 5768 */ 5769 public float getPivotX() { 5770 return mPivotX; 5771 } 5772 5773 /** 5774 * Sets the x location of the point around which the view is 5775 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 5776 * By default, the pivot point is centered on the object. 5777 * Setting this property disables this behavior and causes the view to use only the 5778 * explicitly set pivotX and pivotY values. 5779 * 5780 * @param pivotX The x location of the pivot point. 5781 * @see #getRotation() 5782 * @see #getScaleX() 5783 * @see #getScaleY() 5784 * @see #getPivotY() 5785 * 5786 * @attr ref android.R.styleable#View_transformPivotX 5787 */ 5788 public void setPivotX(float pivotX) { 5789 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5790 if (mPivotX != pivotX) { 5791 // Double-invalidation is necessary to capture view's old and new areas 5792 invalidate(false); 5793 mPivotX = pivotX; 5794 mMatrixDirty = true; 5795 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5796 invalidate(false); 5797 } 5798 } 5799 5800 /** 5801 * The y location of the point around which the view is {@link #setRotation(float) rotated} 5802 * and {@link #setScaleY(float) scaled}. 5803 * 5804 * @see #getRotation() 5805 * @see #getScaleX() 5806 * @see #getScaleY() 5807 * @see #getPivotY() 5808 * @return The y location of the pivot point. 5809 */ 5810 public float getPivotY() { 5811 return mPivotY; 5812 } 5813 5814 /** 5815 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 5816 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 5817 * Setting this property disables this behavior and causes the view to use only the 5818 * explicitly set pivotX and pivotY values. 5819 * 5820 * @param pivotY The y location of the pivot point. 5821 * @see #getRotation() 5822 * @see #getScaleX() 5823 * @see #getScaleY() 5824 * @see #getPivotY() 5825 * 5826 * @attr ref android.R.styleable#View_transformPivotY 5827 */ 5828 public void setPivotY(float pivotY) { 5829 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5830 if (mPivotY != pivotY) { 5831 // Double-invalidation is necessary to capture view's old and new areas 5832 invalidate(false); 5833 mPivotY = pivotY; 5834 mMatrixDirty = true; 5835 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5836 invalidate(false); 5837 } 5838 } 5839 5840 /** 5841 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 5842 * completely transparent and 1 means the view is completely opaque. 5843 * 5844 * <p>By default this is 1.0f. 5845 * @return The opacity of the view. 5846 */ 5847 public float getAlpha() { 5848 return mAlpha; 5849 } 5850 5851 /** 5852 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 5853 * completely transparent and 1 means the view is completely opaque.</p> 5854 * 5855 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 5856 * responsible for applying the opacity itself. Otherwise, calling this method is 5857 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 5858 * setting a hardware layer.</p> 5859 * 5860 * @param alpha The opacity of the view. 5861 * 5862 * @see #setLayerType(int, android.graphics.Paint) 5863 * 5864 * @attr ref android.R.styleable#View_alpha 5865 */ 5866 public void setAlpha(float alpha) { 5867 mAlpha = alpha; 5868 if (onSetAlpha((int) (alpha * 255))) { 5869 mPrivateFlags |= ALPHA_SET; 5870 // subclass is handling alpha - don't optimize rendering cache invalidation 5871 invalidate(); 5872 } else { 5873 mPrivateFlags &= ~ALPHA_SET; 5874 invalidate(false); 5875 } 5876 } 5877 5878 /** 5879 * Top position of this view relative to its parent. 5880 * 5881 * @return The top of this view, in pixels. 5882 */ 5883 @ViewDebug.CapturedViewProperty 5884 public final int getTop() { 5885 return mTop; 5886 } 5887 5888 /** 5889 * Sets the top position of this view relative to its parent. This method is meant to be called 5890 * by the layout system and should not generally be called otherwise, because the property 5891 * may be changed at any time by the layout. 5892 * 5893 * @param top The top of this view, in pixels. 5894 */ 5895 public final void setTop(int top) { 5896 if (top != mTop) { 5897 updateMatrix(); 5898 if (mMatrixIsIdentity) { 5899 final ViewParent p = mParent; 5900 if (p != null && mAttachInfo != null) { 5901 final Rect r = mAttachInfo.mTmpInvalRect; 5902 int minTop; 5903 int yLoc; 5904 if (top < mTop) { 5905 minTop = top; 5906 yLoc = top - mTop; 5907 } else { 5908 minTop = mTop; 5909 yLoc = 0; 5910 } 5911 r.set(0, yLoc, mRight - mLeft, mBottom - minTop); 5912 p.invalidateChild(this, r); 5913 } 5914 } else { 5915 // Double-invalidation is necessary to capture view's old and new areas 5916 invalidate(); 5917 } 5918 5919 int width = mRight - mLeft; 5920 int oldHeight = mBottom - mTop; 5921 5922 mTop = top; 5923 5924 onSizeChanged(width, mBottom - mTop, width, oldHeight); 5925 5926 if (!mMatrixIsIdentity) { 5927 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5928 // A change in dimension means an auto-centered pivot point changes, too 5929 mMatrixDirty = true; 5930 } 5931 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5932 invalidate(); 5933 } 5934 mBackgroundSizeChanged = true; 5935 } 5936 } 5937 5938 /** 5939 * Bottom position of this view relative to its parent. 5940 * 5941 * @return The bottom of this view, in pixels. 5942 */ 5943 @ViewDebug.CapturedViewProperty 5944 public final int getBottom() { 5945 return mBottom; 5946 } 5947 5948 /** 5949 * True if this view has changed since the last time being drawn. 5950 * 5951 * @return The dirty state of this view. 5952 */ 5953 public boolean isDirty() { 5954 return (mPrivateFlags & DIRTY_MASK) != 0; 5955 } 5956 5957 /** 5958 * Sets the bottom position of this view relative to its parent. This method is meant to be 5959 * called by the layout system and should not generally be called otherwise, because the 5960 * property may be changed at any time by the layout. 5961 * 5962 * @param bottom The bottom of this view, in pixels. 5963 */ 5964 public final void setBottom(int bottom) { 5965 if (bottom != mBottom) { 5966 updateMatrix(); 5967 if (mMatrixIsIdentity) { 5968 final ViewParent p = mParent; 5969 if (p != null && mAttachInfo != null) { 5970 final Rect r = mAttachInfo.mTmpInvalRect; 5971 int maxBottom; 5972 if (bottom < mBottom) { 5973 maxBottom = mBottom; 5974 } else { 5975 maxBottom = bottom; 5976 } 5977 r.set(0, 0, mRight - mLeft, maxBottom - mTop); 5978 p.invalidateChild(this, r); 5979 } 5980 } else { 5981 // Double-invalidation is necessary to capture view's old and new areas 5982 invalidate(); 5983 } 5984 5985 int width = mRight - mLeft; 5986 int oldHeight = mBottom - mTop; 5987 5988 mBottom = bottom; 5989 5990 onSizeChanged(width, mBottom - mTop, width, oldHeight); 5991 5992 if (!mMatrixIsIdentity) { 5993 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5994 // A change in dimension means an auto-centered pivot point changes, too 5995 mMatrixDirty = true; 5996 } 5997 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5998 invalidate(); 5999 } 6000 mBackgroundSizeChanged = true; 6001 } 6002 } 6003 6004 /** 6005 * Left position of this view relative to its parent. 6006 * 6007 * @return The left edge of this view, in pixels. 6008 */ 6009 @ViewDebug.CapturedViewProperty 6010 public final int getLeft() { 6011 return mLeft; 6012 } 6013 6014 /** 6015 * Sets the left position of this view relative to its parent. This method is meant to be called 6016 * by the layout system and should not generally be called otherwise, because the property 6017 * may be changed at any time by the layout. 6018 * 6019 * @param left The bottom of this view, in pixels. 6020 */ 6021 public final void setLeft(int left) { 6022 if (left != mLeft) { 6023 updateMatrix(); 6024 if (mMatrixIsIdentity) { 6025 final ViewParent p = mParent; 6026 if (p != null && mAttachInfo != null) { 6027 final Rect r = mAttachInfo.mTmpInvalRect; 6028 int minLeft; 6029 int xLoc; 6030 if (left < mLeft) { 6031 minLeft = left; 6032 xLoc = left - mLeft; 6033 } else { 6034 minLeft = mLeft; 6035 xLoc = 0; 6036 } 6037 r.set(xLoc, 0, mRight - minLeft, mBottom - mTop); 6038 p.invalidateChild(this, r); 6039 } 6040 } else { 6041 // Double-invalidation is necessary to capture view's old and new areas 6042 invalidate(); 6043 } 6044 6045 int oldWidth = mRight - mLeft; 6046 int height = mBottom - mTop; 6047 6048 mLeft = left; 6049 6050 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6051 6052 if (!mMatrixIsIdentity) { 6053 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6054 // A change in dimension means an auto-centered pivot point changes, too 6055 mMatrixDirty = true; 6056 } 6057 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6058 invalidate(); 6059 } 6060 mBackgroundSizeChanged = true; 6061 } 6062 } 6063 6064 /** 6065 * Right position of this view relative to its parent. 6066 * 6067 * @return The right edge of this view, in pixels. 6068 */ 6069 @ViewDebug.CapturedViewProperty 6070 public final int getRight() { 6071 return mRight; 6072 } 6073 6074 /** 6075 * Sets the right position of this view relative to its parent. This method is meant to be called 6076 * by the layout system and should not generally be called otherwise, because the property 6077 * may be changed at any time by the layout. 6078 * 6079 * @param right The bottom of this view, in pixels. 6080 */ 6081 public final void setRight(int right) { 6082 if (right != mRight) { 6083 updateMatrix(); 6084 if (mMatrixIsIdentity) { 6085 final ViewParent p = mParent; 6086 if (p != null && mAttachInfo != null) { 6087 final Rect r = mAttachInfo.mTmpInvalRect; 6088 int maxRight; 6089 if (right < mRight) { 6090 maxRight = mRight; 6091 } else { 6092 maxRight = right; 6093 } 6094 r.set(0, 0, maxRight - mLeft, mBottom - mTop); 6095 p.invalidateChild(this, r); 6096 } 6097 } else { 6098 // Double-invalidation is necessary to capture view's old and new areas 6099 invalidate(); 6100 } 6101 6102 int oldWidth = mRight - mLeft; 6103 int height = mBottom - mTop; 6104 6105 mRight = right; 6106 6107 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6108 6109 if (!mMatrixIsIdentity) { 6110 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6111 // A change in dimension means an auto-centered pivot point changes, too 6112 mMatrixDirty = true; 6113 } 6114 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6115 invalidate(); 6116 } 6117 mBackgroundSizeChanged = true; 6118 } 6119 } 6120 6121 /** 6122 * The visual x position of this view, in pixels. This is equivalent to the 6123 * {@link #setTranslationX(float) translationX} property plus the current 6124 * {@link #getLeft() left} property. 6125 * 6126 * @return The visual x position of this view, in pixels. 6127 */ 6128 public float getX() { 6129 return mLeft + mTranslationX; 6130 } 6131 6132 /** 6133 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 6134 * {@link #setTranslationX(float) translationX} property to be the difference between 6135 * the x value passed in and the current {@link #getLeft() left} property. 6136 * 6137 * @param x The visual x position of this view, in pixels. 6138 */ 6139 public void setX(float x) { 6140 setTranslationX(x - mLeft); 6141 } 6142 6143 /** 6144 * The visual y position of this view, in pixels. This is equivalent to the 6145 * {@link #setTranslationY(float) translationY} property plus the current 6146 * {@link #getTop() top} property. 6147 * 6148 * @return The visual y position of this view, in pixels. 6149 */ 6150 public float getY() { 6151 return mTop + mTranslationY; 6152 } 6153 6154 /** 6155 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 6156 * {@link #setTranslationY(float) translationY} property to be the difference between 6157 * the y value passed in and the current {@link #getTop() top} property. 6158 * 6159 * @param y The visual y position of this view, in pixels. 6160 */ 6161 public void setY(float y) { 6162 setTranslationY(y - mTop); 6163 } 6164 6165 6166 /** 6167 * The horizontal location of this view relative to its {@link #getLeft() left} position. 6168 * This position is post-layout, in addition to wherever the object's 6169 * layout placed it. 6170 * 6171 * @return The horizontal position of this view relative to its left position, in pixels. 6172 */ 6173 public float getTranslationX() { 6174 return mTranslationX; 6175 } 6176 6177 /** 6178 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 6179 * This effectively positions the object post-layout, in addition to wherever the object's 6180 * layout placed it. 6181 * 6182 * @param translationX The horizontal position of this view relative to its left position, 6183 * in pixels. 6184 * 6185 * @attr ref android.R.styleable#View_translationX 6186 */ 6187 public void setTranslationX(float translationX) { 6188 if (mTranslationX != translationX) { 6189 // Double-invalidation is necessary to capture view's old and new areas 6190 invalidate(false); 6191 mTranslationX = translationX; 6192 mMatrixDirty = true; 6193 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6194 invalidate(false); 6195 } 6196 } 6197 6198 /** 6199 * The horizontal location of this view relative to its {@link #getTop() top} position. 6200 * This position is post-layout, in addition to wherever the object's 6201 * layout placed it. 6202 * 6203 * @return The vertical position of this view relative to its top position, 6204 * in pixels. 6205 */ 6206 public float getTranslationY() { 6207 return mTranslationY; 6208 } 6209 6210 /** 6211 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 6212 * This effectively positions the object post-layout, in addition to wherever the object's 6213 * layout placed it. 6214 * 6215 * @param translationY The vertical position of this view relative to its top position, 6216 * in pixels. 6217 * 6218 * @attr ref android.R.styleable#View_translationY 6219 */ 6220 public void setTranslationY(float translationY) { 6221 if (mTranslationY != translationY) { 6222 // Double-invalidation is necessary to capture view's old and new areas 6223 invalidate(false); 6224 mTranslationY = translationY; 6225 mMatrixDirty = true; 6226 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6227 invalidate(false); 6228 } 6229 } 6230 6231 /** 6232 * Hit rectangle in parent's coordinates 6233 * 6234 * @param outRect The hit rectangle of the view. 6235 */ 6236 public void getHitRect(Rect outRect) { 6237 updateMatrix(); 6238 if (mMatrixIsIdentity || mAttachInfo == null) { 6239 outRect.set(mLeft, mTop, mRight, mBottom); 6240 } else { 6241 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 6242 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 6243 mMatrix.mapRect(tmpRect); 6244 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 6245 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 6246 } 6247 } 6248 6249 /** 6250 * Determines whether the given point, in local coordinates is inside the view. 6251 */ 6252 /*package*/ final boolean pointInView(float localX, float localY) { 6253 return localX >= 0 && localX < (mRight - mLeft) 6254 && localY >= 0 && localY < (mBottom - mTop); 6255 } 6256 6257 /** 6258 * Utility method to determine whether the given point, in local coordinates, 6259 * is inside the view, where the area of the view is expanded by the slop factor. 6260 * This method is called while processing touch-move events to determine if the event 6261 * is still within the view. 6262 */ 6263 private boolean pointInView(float localX, float localY, float slop) { 6264 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 6265 localY < ((mBottom - mTop) + slop); 6266 } 6267 6268 /** 6269 * When a view has focus and the user navigates away from it, the next view is searched for 6270 * starting from the rectangle filled in by this method. 6271 * 6272 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 6273 * view maintains some idea of internal selection, such as a cursor, or a selected row 6274 * or column, you should override this method and fill in a more specific rectangle. 6275 * 6276 * @param r The rectangle to fill in, in this view's coordinates. 6277 */ 6278 public void getFocusedRect(Rect r) { 6279 getDrawingRect(r); 6280 } 6281 6282 /** 6283 * If some part of this view is not clipped by any of its parents, then 6284 * return that area in r in global (root) coordinates. To convert r to local 6285 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 6286 * -globalOffset.y)) If the view is completely clipped or translated out, 6287 * return false. 6288 * 6289 * @param r If true is returned, r holds the global coordinates of the 6290 * visible portion of this view. 6291 * @param globalOffset If true is returned, globalOffset holds the dx,dy 6292 * between this view and its root. globalOffet may be null. 6293 * @return true if r is non-empty (i.e. part of the view is visible at the 6294 * root level. 6295 */ 6296 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 6297 int width = mRight - mLeft; 6298 int height = mBottom - mTop; 6299 if (width > 0 && height > 0) { 6300 r.set(0, 0, width, height); 6301 if (globalOffset != null) { 6302 globalOffset.set(-mScrollX, -mScrollY); 6303 } 6304 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 6305 } 6306 return false; 6307 } 6308 6309 public final boolean getGlobalVisibleRect(Rect r) { 6310 return getGlobalVisibleRect(r, null); 6311 } 6312 6313 public final boolean getLocalVisibleRect(Rect r) { 6314 Point offset = new Point(); 6315 if (getGlobalVisibleRect(r, offset)) { 6316 r.offset(-offset.x, -offset.y); // make r local 6317 return true; 6318 } 6319 return false; 6320 } 6321 6322 /** 6323 * Offset this view's vertical location by the specified number of pixels. 6324 * 6325 * @param offset the number of pixels to offset the view by 6326 */ 6327 public void offsetTopAndBottom(int offset) { 6328 if (offset != 0) { 6329 updateMatrix(); 6330 if (mMatrixIsIdentity) { 6331 final ViewParent p = mParent; 6332 if (p != null && mAttachInfo != null) { 6333 final Rect r = mAttachInfo.mTmpInvalRect; 6334 int minTop; 6335 int maxBottom; 6336 int yLoc; 6337 if (offset < 0) { 6338 minTop = mTop + offset; 6339 maxBottom = mBottom; 6340 yLoc = offset; 6341 } else { 6342 minTop = mTop; 6343 maxBottom = mBottom + offset; 6344 yLoc = 0; 6345 } 6346 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 6347 p.invalidateChild(this, r); 6348 } 6349 } else { 6350 invalidate(false); 6351 } 6352 6353 mTop += offset; 6354 mBottom += offset; 6355 6356 if (!mMatrixIsIdentity) { 6357 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6358 invalidate(false); 6359 } 6360 } 6361 } 6362 6363 /** 6364 * Offset this view's horizontal location by the specified amount of pixels. 6365 * 6366 * @param offset the numer of pixels to offset the view by 6367 */ 6368 public void offsetLeftAndRight(int offset) { 6369 if (offset != 0) { 6370 updateMatrix(); 6371 if (mMatrixIsIdentity) { 6372 final ViewParent p = mParent; 6373 if (p != null && mAttachInfo != null) { 6374 final Rect r = mAttachInfo.mTmpInvalRect; 6375 int minLeft; 6376 int maxRight; 6377 if (offset < 0) { 6378 minLeft = mLeft + offset; 6379 maxRight = mRight; 6380 } else { 6381 minLeft = mLeft; 6382 maxRight = mRight + offset; 6383 } 6384 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 6385 p.invalidateChild(this, r); 6386 } 6387 } else { 6388 invalidate(false); 6389 } 6390 6391 mLeft += offset; 6392 mRight += offset; 6393 6394 if (!mMatrixIsIdentity) { 6395 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6396 invalidate(false); 6397 } 6398 } 6399 } 6400 6401 /** 6402 * Get the LayoutParams associated with this view. All views should have 6403 * layout parameters. These supply parameters to the <i>parent</i> of this 6404 * view specifying how it should be arranged. There are many subclasses of 6405 * ViewGroup.LayoutParams, and these correspond to the different subclasses 6406 * of ViewGroup that are responsible for arranging their children. 6407 * @return The LayoutParams associated with this view 6408 */ 6409 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 6410 public ViewGroup.LayoutParams getLayoutParams() { 6411 return mLayoutParams; 6412 } 6413 6414 /** 6415 * Set the layout parameters associated with this view. These supply 6416 * parameters to the <i>parent</i> of this view specifying how it should be 6417 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 6418 * correspond to the different subclasses of ViewGroup that are responsible 6419 * for arranging their children. 6420 * 6421 * @param params the layout parameters for this view 6422 */ 6423 public void setLayoutParams(ViewGroup.LayoutParams params) { 6424 if (params == null) { 6425 throw new NullPointerException("params == null"); 6426 } 6427 mLayoutParams = params; 6428 requestLayout(); 6429 } 6430 6431 /** 6432 * Set the scrolled position of your view. This will cause a call to 6433 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6434 * invalidated. 6435 * @param x the x position to scroll to 6436 * @param y the y position to scroll to 6437 */ 6438 public void scrollTo(int x, int y) { 6439 if (mScrollX != x || mScrollY != y) { 6440 int oldX = mScrollX; 6441 int oldY = mScrollY; 6442 mScrollX = x; 6443 mScrollY = y; 6444 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 6445 if (!awakenScrollBars()) { 6446 invalidate(); 6447 } 6448 } 6449 } 6450 6451 /** 6452 * Move the scrolled position of your view. This will cause a call to 6453 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6454 * invalidated. 6455 * @param x the amount of pixels to scroll by horizontally 6456 * @param y the amount of pixels to scroll by vertically 6457 */ 6458 public void scrollBy(int x, int y) { 6459 scrollTo(mScrollX + x, mScrollY + y); 6460 } 6461 6462 /** 6463 * <p>Trigger the scrollbars to draw. When invoked this method starts an 6464 * animation to fade the scrollbars out after a default delay. If a subclass 6465 * provides animated scrolling, the start delay should equal the duration 6466 * of the scrolling animation.</p> 6467 * 6468 * <p>The animation starts only if at least one of the scrollbars is 6469 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 6470 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6471 * this method returns true, and false otherwise. If the animation is 6472 * started, this method calls {@link #invalidate()}; in that case the 6473 * caller should not call {@link #invalidate()}.</p> 6474 * 6475 * <p>This method should be invoked every time a subclass directly updates 6476 * the scroll parameters.</p> 6477 * 6478 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6479 * and {@link #scrollTo(int, int)}.</p> 6480 * 6481 * @return true if the animation is played, false otherwise 6482 * 6483 * @see #awakenScrollBars(int) 6484 * @see #scrollBy(int, int) 6485 * @see #scrollTo(int, int) 6486 * @see #isHorizontalScrollBarEnabled() 6487 * @see #isVerticalScrollBarEnabled() 6488 * @see #setHorizontalScrollBarEnabled(boolean) 6489 * @see #setVerticalScrollBarEnabled(boolean) 6490 */ 6491 protected boolean awakenScrollBars() { 6492 return mScrollCache != null && 6493 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6494 } 6495 6496 /** 6497 * Trigger the scrollbars to draw. 6498 * This method differs from awakenScrollBars() only in its default duration. 6499 * initialAwakenScrollBars() will show the scroll bars for longer than 6500 * usual to give the user more of a chance to notice them. 6501 * 6502 * @return true if the animation is played, false otherwise. 6503 */ 6504 private boolean initialAwakenScrollBars() { 6505 return mScrollCache != null && 6506 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6507 } 6508 6509 /** 6510 * <p> 6511 * Trigger the scrollbars to draw. When invoked this method starts an 6512 * animation to fade the scrollbars out after a fixed delay. If a subclass 6513 * provides animated scrolling, the start delay should equal the duration of 6514 * the scrolling animation. 6515 * </p> 6516 * 6517 * <p> 6518 * The animation starts only if at least one of the scrollbars is enabled, 6519 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6520 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6521 * this method returns true, and false otherwise. If the animation is 6522 * started, this method calls {@link #invalidate()}; in that case the caller 6523 * should not call {@link #invalidate()}. 6524 * </p> 6525 * 6526 * <p> 6527 * This method should be invoked everytime a subclass directly updates the 6528 * scroll parameters. 6529 * </p> 6530 * 6531 * @param startDelay the delay, in milliseconds, after which the animation 6532 * should start; when the delay is 0, the animation starts 6533 * immediately 6534 * @return true if the animation is played, false otherwise 6535 * 6536 * @see #scrollBy(int, int) 6537 * @see #scrollTo(int, int) 6538 * @see #isHorizontalScrollBarEnabled() 6539 * @see #isVerticalScrollBarEnabled() 6540 * @see #setHorizontalScrollBarEnabled(boolean) 6541 * @see #setVerticalScrollBarEnabled(boolean) 6542 */ 6543 protected boolean awakenScrollBars(int startDelay) { 6544 return awakenScrollBars(startDelay, true); 6545 } 6546 6547 /** 6548 * <p> 6549 * Trigger the scrollbars to draw. When invoked this method starts an 6550 * animation to fade the scrollbars out after a fixed delay. If a subclass 6551 * provides animated scrolling, the start delay should equal the duration of 6552 * the scrolling animation. 6553 * </p> 6554 * 6555 * <p> 6556 * The animation starts only if at least one of the scrollbars is enabled, 6557 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6558 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6559 * this method returns true, and false otherwise. If the animation is 6560 * started, this method calls {@link #invalidate()} if the invalidate parameter 6561 * is set to true; in that case the caller 6562 * should not call {@link #invalidate()}. 6563 * </p> 6564 * 6565 * <p> 6566 * This method should be invoked everytime a subclass directly updates the 6567 * scroll parameters. 6568 * </p> 6569 * 6570 * @param startDelay the delay, in milliseconds, after which the animation 6571 * should start; when the delay is 0, the animation starts 6572 * immediately 6573 * 6574 * @param invalidate Wheter this method should call invalidate 6575 * 6576 * @return true if the animation is played, false otherwise 6577 * 6578 * @see #scrollBy(int, int) 6579 * @see #scrollTo(int, int) 6580 * @see #isHorizontalScrollBarEnabled() 6581 * @see #isVerticalScrollBarEnabled() 6582 * @see #setHorizontalScrollBarEnabled(boolean) 6583 * @see #setVerticalScrollBarEnabled(boolean) 6584 */ 6585 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 6586 final ScrollabilityCache scrollCache = mScrollCache; 6587 6588 if (scrollCache == null || !scrollCache.fadeScrollBars) { 6589 return false; 6590 } 6591 6592 if (scrollCache.scrollBar == null) { 6593 scrollCache.scrollBar = new ScrollBarDrawable(); 6594 } 6595 6596 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 6597 6598 if (invalidate) { 6599 // Invalidate to show the scrollbars 6600 invalidate(); 6601 } 6602 6603 if (scrollCache.state == ScrollabilityCache.OFF) { 6604 // FIXME: this is copied from WindowManagerService. 6605 // We should get this value from the system when it 6606 // is possible to do so. 6607 final int KEY_REPEAT_FIRST_DELAY = 750; 6608 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 6609 } 6610 6611 // Tell mScrollCache when we should start fading. This may 6612 // extend the fade start time if one was already scheduled 6613 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 6614 scrollCache.fadeStartTime = fadeStartTime; 6615 scrollCache.state = ScrollabilityCache.ON; 6616 6617 // Schedule our fader to run, unscheduling any old ones first 6618 if (mAttachInfo != null) { 6619 mAttachInfo.mHandler.removeCallbacks(scrollCache); 6620 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 6621 } 6622 6623 return true; 6624 } 6625 6626 return false; 6627 } 6628 6629 /** 6630 * Mark the the area defined by dirty as needing to be drawn. If the view is 6631 * visible, {@link #onDraw} will be called at some point in the future. 6632 * This must be called from a UI thread. To call from a non-UI thread, call 6633 * {@link #postInvalidate()}. 6634 * 6635 * WARNING: This method is destructive to dirty. 6636 * @param dirty the rectangle representing the bounds of the dirty region 6637 */ 6638 public void invalidate(Rect dirty) { 6639 if (ViewDebug.TRACE_HIERARCHY) { 6640 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6641 } 6642 6643 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6644 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6645 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6646 final ViewParent p = mParent; 6647 final AttachInfo ai = mAttachInfo; 6648 if (p != null && ai != null && ai.mHardwareAccelerated) { 6649 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6650 // with a null dirty rect, which tells the ViewRoot to redraw everything 6651 p.invalidateChild(this, null); 6652 return; 6653 } 6654 if (p != null && ai != null) { 6655 final int scrollX = mScrollX; 6656 final int scrollY = mScrollY; 6657 final Rect r = ai.mTmpInvalRect; 6658 r.set(dirty.left - scrollX, dirty.top - scrollY, 6659 dirty.right - scrollX, dirty.bottom - scrollY); 6660 mParent.invalidateChild(this, r); 6661 } 6662 } 6663 } 6664 6665 /** 6666 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 6667 * The coordinates of the dirty rect are relative to the view. 6668 * If the view is visible, {@link #onDraw} will be called at some point 6669 * in the future. This must be called from a UI thread. To call 6670 * from a non-UI thread, call {@link #postInvalidate()}. 6671 * @param l the left position of the dirty region 6672 * @param t the top position of the dirty region 6673 * @param r the right position of the dirty region 6674 * @param b the bottom position of the dirty region 6675 */ 6676 public void invalidate(int l, int t, int r, int b) { 6677 if (ViewDebug.TRACE_HIERARCHY) { 6678 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6679 } 6680 6681 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6682 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6683 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6684 final ViewParent p = mParent; 6685 final AttachInfo ai = mAttachInfo; 6686 if (p != null && ai != null && ai.mHardwareAccelerated) { 6687 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6688 // with a null dirty rect, which tells the ViewRoot to redraw everything 6689 p.invalidateChild(this, null); 6690 return; 6691 } 6692 if (p != null && ai != null && l < r && t < b) { 6693 final int scrollX = mScrollX; 6694 final int scrollY = mScrollY; 6695 final Rect tmpr = ai.mTmpInvalRect; 6696 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 6697 p.invalidateChild(this, tmpr); 6698 } 6699 } 6700 } 6701 6702 /** 6703 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 6704 * be called at some point in the future. This must be called from a 6705 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 6706 */ 6707 public void invalidate() { 6708 invalidate(true); 6709 } 6710 6711 /** 6712 * This is where the invalidate() work actually happens. A full invalidate() 6713 * causes the drawing cache to be invalidated, but this function can be called with 6714 * invalidateCache set to false to skip that invalidation step for cases that do not 6715 * need it (for example, a component that remains at the same dimensions with the same 6716 * content). 6717 * 6718 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 6719 * well. This is usually true for a full invalidate, but may be set to false if the 6720 * View's contents or dimensions have not changed. 6721 */ 6722 private void invalidate(boolean invalidateCache) { 6723 if (ViewDebug.TRACE_HIERARCHY) { 6724 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6725 } 6726 6727 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6728 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID)) { 6729 mPrivateFlags &= ~DRAWN; 6730 if (invalidateCache) { 6731 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6732 } 6733 final AttachInfo ai = mAttachInfo; 6734 final ViewParent p = mParent; 6735 if (p != null && ai != null && ai.mHardwareAccelerated) { 6736 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6737 // with a null dirty rect, which tells the ViewRoot to redraw everything 6738 p.invalidateChild(this, null); 6739 return; 6740 } 6741 6742 if (p != null && ai != null) { 6743 final Rect r = ai.mTmpInvalRect; 6744 r.set(0, 0, mRight - mLeft, mBottom - mTop); 6745 // Don't call invalidate -- we don't want to internally scroll 6746 // our own bounds 6747 p.invalidateChild(this, r); 6748 } 6749 } 6750 } 6751 6752 /** 6753 * Indicates whether this View is opaque. An opaque View guarantees that it will 6754 * draw all the pixels overlapping its bounds using a fully opaque color. 6755 * 6756 * Subclasses of View should override this method whenever possible to indicate 6757 * whether an instance is opaque. Opaque Views are treated in a special way by 6758 * the View hierarchy, possibly allowing it to perform optimizations during 6759 * invalidate/draw passes. 6760 * 6761 * @return True if this View is guaranteed to be fully opaque, false otherwise. 6762 */ 6763 @ViewDebug.ExportedProperty(category = "drawing") 6764 public boolean isOpaque() { 6765 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 6766 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 6767 } 6768 6769 /** 6770 * @hide 6771 */ 6772 protected void computeOpaqueFlags() { 6773 // Opaque if: 6774 // - Has a background 6775 // - Background is opaque 6776 // - Doesn't have scrollbars or scrollbars are inside overlay 6777 6778 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 6779 mPrivateFlags |= OPAQUE_BACKGROUND; 6780 } else { 6781 mPrivateFlags &= ~OPAQUE_BACKGROUND; 6782 } 6783 6784 final int flags = mViewFlags; 6785 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 6786 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 6787 mPrivateFlags |= OPAQUE_SCROLLBARS; 6788 } else { 6789 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 6790 } 6791 } 6792 6793 /** 6794 * @hide 6795 */ 6796 protected boolean hasOpaqueScrollbars() { 6797 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 6798 } 6799 6800 /** 6801 * @return A handler associated with the thread running the View. This 6802 * handler can be used to pump events in the UI events queue. 6803 */ 6804 public Handler getHandler() { 6805 if (mAttachInfo != null) { 6806 return mAttachInfo.mHandler; 6807 } 6808 return null; 6809 } 6810 6811 /** 6812 * Causes the Runnable to be added to the message queue. 6813 * The runnable will be run on the user interface thread. 6814 * 6815 * @param action The Runnable that will be executed. 6816 * 6817 * @return Returns true if the Runnable was successfully placed in to the 6818 * message queue. Returns false on failure, usually because the 6819 * looper processing the message queue is exiting. 6820 */ 6821 public boolean post(Runnable action) { 6822 Handler handler; 6823 if (mAttachInfo != null) { 6824 handler = mAttachInfo.mHandler; 6825 } else { 6826 // Assume that post will succeed later 6827 ViewRoot.getRunQueue().post(action); 6828 return true; 6829 } 6830 6831 return handler.post(action); 6832 } 6833 6834 /** 6835 * Causes the Runnable to be added to the message queue, to be run 6836 * after the specified amount of time elapses. 6837 * The runnable will be run on the user interface thread. 6838 * 6839 * @param action The Runnable that will be executed. 6840 * @param delayMillis The delay (in milliseconds) until the Runnable 6841 * will be executed. 6842 * 6843 * @return true if the Runnable was successfully placed in to the 6844 * message queue. Returns false on failure, usually because the 6845 * looper processing the message queue is exiting. Note that a 6846 * result of true does not mean the Runnable will be processed -- 6847 * if the looper is quit before the delivery time of the message 6848 * occurs then the message will be dropped. 6849 */ 6850 public boolean postDelayed(Runnable action, long delayMillis) { 6851 Handler handler; 6852 if (mAttachInfo != null) { 6853 handler = mAttachInfo.mHandler; 6854 } else { 6855 // Assume that post will succeed later 6856 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 6857 return true; 6858 } 6859 6860 return handler.postDelayed(action, delayMillis); 6861 } 6862 6863 /** 6864 * Removes the specified Runnable from the message queue. 6865 * 6866 * @param action The Runnable to remove from the message handling queue 6867 * 6868 * @return true if this view could ask the Handler to remove the Runnable, 6869 * false otherwise. When the returned value is true, the Runnable 6870 * may or may not have been actually removed from the message queue 6871 * (for instance, if the Runnable was not in the queue already.) 6872 */ 6873 public boolean removeCallbacks(Runnable action) { 6874 Handler handler; 6875 if (mAttachInfo != null) { 6876 handler = mAttachInfo.mHandler; 6877 } else { 6878 // Assume that post will succeed later 6879 ViewRoot.getRunQueue().removeCallbacks(action); 6880 return true; 6881 } 6882 6883 handler.removeCallbacks(action); 6884 return true; 6885 } 6886 6887 /** 6888 * Cause an invalidate to happen on a subsequent cycle through the event loop. 6889 * Use this to invalidate the View from a non-UI thread. 6890 * 6891 * @see #invalidate() 6892 */ 6893 public void postInvalidate() { 6894 postInvalidateDelayed(0); 6895 } 6896 6897 /** 6898 * Cause an invalidate of the specified area to happen on a subsequent cycle 6899 * through the event loop. Use this to invalidate the View from a non-UI thread. 6900 * 6901 * @param left The left coordinate of the rectangle to invalidate. 6902 * @param top The top coordinate of the rectangle to invalidate. 6903 * @param right The right coordinate of the rectangle to invalidate. 6904 * @param bottom The bottom coordinate of the rectangle to invalidate. 6905 * 6906 * @see #invalidate(int, int, int, int) 6907 * @see #invalidate(Rect) 6908 */ 6909 public void postInvalidate(int left, int top, int right, int bottom) { 6910 postInvalidateDelayed(0, left, top, right, bottom); 6911 } 6912 6913 /** 6914 * Cause an invalidate to happen on a subsequent cycle through the event 6915 * loop. Waits for the specified amount of time. 6916 * 6917 * @param delayMilliseconds the duration in milliseconds to delay the 6918 * invalidation by 6919 */ 6920 public void postInvalidateDelayed(long delayMilliseconds) { 6921 // We try only with the AttachInfo because there's no point in invalidating 6922 // if we are not attached to our window 6923 if (mAttachInfo != null) { 6924 Message msg = Message.obtain(); 6925 msg.what = AttachInfo.INVALIDATE_MSG; 6926 msg.obj = this; 6927 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6928 } 6929 } 6930 6931 /** 6932 * Cause an invalidate of the specified area to happen on a subsequent cycle 6933 * through the event loop. Waits for the specified amount of time. 6934 * 6935 * @param delayMilliseconds the duration in milliseconds to delay the 6936 * invalidation by 6937 * @param left The left coordinate of the rectangle to invalidate. 6938 * @param top The top coordinate of the rectangle to invalidate. 6939 * @param right The right coordinate of the rectangle to invalidate. 6940 * @param bottom The bottom coordinate of the rectangle to invalidate. 6941 */ 6942 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 6943 int right, int bottom) { 6944 6945 // We try only with the AttachInfo because there's no point in invalidating 6946 // if we are not attached to our window 6947 if (mAttachInfo != null) { 6948 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 6949 info.target = this; 6950 info.left = left; 6951 info.top = top; 6952 info.right = right; 6953 info.bottom = bottom; 6954 6955 final Message msg = Message.obtain(); 6956 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 6957 msg.obj = info; 6958 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6959 } 6960 } 6961 6962 /** 6963 * Called by a parent to request that a child update its values for mScrollX 6964 * and mScrollY if necessary. This will typically be done if the child is 6965 * animating a scroll using a {@link android.widget.Scroller Scroller} 6966 * object. 6967 */ 6968 public void computeScroll() { 6969 } 6970 6971 /** 6972 * <p>Indicate whether the horizontal edges are faded when the view is 6973 * scrolled horizontally.</p> 6974 * 6975 * @return true if the horizontal edges should are faded on scroll, false 6976 * otherwise 6977 * 6978 * @see #setHorizontalFadingEdgeEnabled(boolean) 6979 * @attr ref android.R.styleable#View_fadingEdge 6980 */ 6981 public boolean isHorizontalFadingEdgeEnabled() { 6982 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 6983 } 6984 6985 /** 6986 * <p>Define whether the horizontal edges should be faded when this view 6987 * is scrolled horizontally.</p> 6988 * 6989 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 6990 * be faded when the view is scrolled 6991 * horizontally 6992 * 6993 * @see #isHorizontalFadingEdgeEnabled() 6994 * @attr ref android.R.styleable#View_fadingEdge 6995 */ 6996 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 6997 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 6998 if (horizontalFadingEdgeEnabled) { 6999 initScrollCache(); 7000 } 7001 7002 mViewFlags ^= FADING_EDGE_HORIZONTAL; 7003 } 7004 } 7005 7006 /** 7007 * <p>Indicate whether the vertical edges are faded when the view is 7008 * scrolled horizontally.</p> 7009 * 7010 * @return true if the vertical edges should are faded on scroll, false 7011 * otherwise 7012 * 7013 * @see #setVerticalFadingEdgeEnabled(boolean) 7014 * @attr ref android.R.styleable#View_fadingEdge 7015 */ 7016 public boolean isVerticalFadingEdgeEnabled() { 7017 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 7018 } 7019 7020 /** 7021 * <p>Define whether the vertical edges should be faded when this view 7022 * is scrolled vertically.</p> 7023 * 7024 * @param verticalFadingEdgeEnabled true if the vertical edges should 7025 * be faded when the view is scrolled 7026 * vertically 7027 * 7028 * @see #isVerticalFadingEdgeEnabled() 7029 * @attr ref android.R.styleable#View_fadingEdge 7030 */ 7031 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 7032 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 7033 if (verticalFadingEdgeEnabled) { 7034 initScrollCache(); 7035 } 7036 7037 mViewFlags ^= FADING_EDGE_VERTICAL; 7038 } 7039 } 7040 7041 /** 7042 * Returns the strength, or intensity, of the top faded edge. The strength is 7043 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7044 * returns 0.0 or 1.0 but no value in between. 7045 * 7046 * Subclasses should override this method to provide a smoother fade transition 7047 * when scrolling occurs. 7048 * 7049 * @return the intensity of the top fade as a float between 0.0f and 1.0f 7050 */ 7051 protected float getTopFadingEdgeStrength() { 7052 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 7053 } 7054 7055 /** 7056 * Returns the strength, or intensity, of the bottom faded edge. The strength is 7057 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7058 * returns 0.0 or 1.0 but no value in between. 7059 * 7060 * Subclasses should override this method to provide a smoother fade transition 7061 * when scrolling occurs. 7062 * 7063 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 7064 */ 7065 protected float getBottomFadingEdgeStrength() { 7066 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 7067 computeVerticalScrollRange() ? 1.0f : 0.0f; 7068 } 7069 7070 /** 7071 * Returns the strength, or intensity, of the left faded edge. The strength is 7072 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7073 * returns 0.0 or 1.0 but no value in between. 7074 * 7075 * Subclasses should override this method to provide a smoother fade transition 7076 * when scrolling occurs. 7077 * 7078 * @return the intensity of the left fade as a float between 0.0f and 1.0f 7079 */ 7080 protected float getLeftFadingEdgeStrength() { 7081 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 7082 } 7083 7084 /** 7085 * Returns the strength, or intensity, of the right faded edge. The strength is 7086 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7087 * returns 0.0 or 1.0 but no value in between. 7088 * 7089 * Subclasses should override this method to provide a smoother fade transition 7090 * when scrolling occurs. 7091 * 7092 * @return the intensity of the right fade as a float between 0.0f and 1.0f 7093 */ 7094 protected float getRightFadingEdgeStrength() { 7095 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 7096 computeHorizontalScrollRange() ? 1.0f : 0.0f; 7097 } 7098 7099 /** 7100 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 7101 * scrollbar is not drawn by default.</p> 7102 * 7103 * @return true if the horizontal scrollbar should be painted, false 7104 * otherwise 7105 * 7106 * @see #setHorizontalScrollBarEnabled(boolean) 7107 */ 7108 public boolean isHorizontalScrollBarEnabled() { 7109 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7110 } 7111 7112 /** 7113 * <p>Define whether the horizontal scrollbar should be drawn or not. The 7114 * scrollbar is not drawn by default.</p> 7115 * 7116 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 7117 * be painted 7118 * 7119 * @see #isHorizontalScrollBarEnabled() 7120 */ 7121 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 7122 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 7123 mViewFlags ^= SCROLLBARS_HORIZONTAL; 7124 computeOpaqueFlags(); 7125 recomputePadding(); 7126 } 7127 } 7128 7129 /** 7130 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 7131 * scrollbar is not drawn by default.</p> 7132 * 7133 * @return true if the vertical scrollbar should be painted, false 7134 * otherwise 7135 * 7136 * @see #setVerticalScrollBarEnabled(boolean) 7137 */ 7138 public boolean isVerticalScrollBarEnabled() { 7139 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 7140 } 7141 7142 /** 7143 * <p>Define whether the vertical scrollbar should be drawn or not. The 7144 * scrollbar is not drawn by default.</p> 7145 * 7146 * @param verticalScrollBarEnabled true if the vertical scrollbar should 7147 * be painted 7148 * 7149 * @see #isVerticalScrollBarEnabled() 7150 */ 7151 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 7152 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 7153 mViewFlags ^= SCROLLBARS_VERTICAL; 7154 computeOpaqueFlags(); 7155 recomputePadding(); 7156 } 7157 } 7158 7159 /** 7160 * @hide 7161 */ 7162 protected void recomputePadding() { 7163 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 7164 } 7165 7166 /** 7167 * Define whether scrollbars will fade when the view is not scrolling. 7168 * 7169 * @param fadeScrollbars wheter to enable fading 7170 * 7171 */ 7172 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 7173 initScrollCache(); 7174 final ScrollabilityCache scrollabilityCache = mScrollCache; 7175 scrollabilityCache.fadeScrollBars = fadeScrollbars; 7176 if (fadeScrollbars) { 7177 scrollabilityCache.state = ScrollabilityCache.OFF; 7178 } else { 7179 scrollabilityCache.state = ScrollabilityCache.ON; 7180 } 7181 } 7182 7183 /** 7184 * 7185 * Returns true if scrollbars will fade when this view is not scrolling 7186 * 7187 * @return true if scrollbar fading is enabled 7188 */ 7189 public boolean isScrollbarFadingEnabled() { 7190 return mScrollCache != null && mScrollCache.fadeScrollBars; 7191 } 7192 7193 /** 7194 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 7195 * inset. When inset, they add to the padding of the view. And the scrollbars 7196 * can be drawn inside the padding area or on the edge of the view. For example, 7197 * if a view has a background drawable and you want to draw the scrollbars 7198 * inside the padding specified by the drawable, you can use 7199 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 7200 * appear at the edge of the view, ignoring the padding, then you can use 7201 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 7202 * @param style the style of the scrollbars. Should be one of 7203 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 7204 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 7205 * @see #SCROLLBARS_INSIDE_OVERLAY 7206 * @see #SCROLLBARS_INSIDE_INSET 7207 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7208 * @see #SCROLLBARS_OUTSIDE_INSET 7209 */ 7210 public void setScrollBarStyle(int style) { 7211 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 7212 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 7213 computeOpaqueFlags(); 7214 recomputePadding(); 7215 } 7216 } 7217 7218 /** 7219 * <p>Returns the current scrollbar style.</p> 7220 * @return the current scrollbar style 7221 * @see #SCROLLBARS_INSIDE_OVERLAY 7222 * @see #SCROLLBARS_INSIDE_INSET 7223 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7224 * @see #SCROLLBARS_OUTSIDE_INSET 7225 */ 7226 public int getScrollBarStyle() { 7227 return mViewFlags & SCROLLBARS_STYLE_MASK; 7228 } 7229 7230 /** 7231 * <p>Compute the horizontal range that the horizontal scrollbar 7232 * represents.</p> 7233 * 7234 * <p>The range is expressed in arbitrary units that must be the same as the 7235 * units used by {@link #computeHorizontalScrollExtent()} and 7236 * {@link #computeHorizontalScrollOffset()}.</p> 7237 * 7238 * <p>The default range is the drawing width of this view.</p> 7239 * 7240 * @return the total horizontal range represented by the horizontal 7241 * scrollbar 7242 * 7243 * @see #computeHorizontalScrollExtent() 7244 * @see #computeHorizontalScrollOffset() 7245 * @see android.widget.ScrollBarDrawable 7246 */ 7247 protected int computeHorizontalScrollRange() { 7248 return getWidth(); 7249 } 7250 7251 /** 7252 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 7253 * within the horizontal range. This value is used to compute the position 7254 * of the thumb within the scrollbar's track.</p> 7255 * 7256 * <p>The range is expressed in arbitrary units that must be the same as the 7257 * units used by {@link #computeHorizontalScrollRange()} and 7258 * {@link #computeHorizontalScrollExtent()}.</p> 7259 * 7260 * <p>The default offset is the scroll offset of this view.</p> 7261 * 7262 * @return the horizontal offset of the scrollbar's thumb 7263 * 7264 * @see #computeHorizontalScrollRange() 7265 * @see #computeHorizontalScrollExtent() 7266 * @see android.widget.ScrollBarDrawable 7267 */ 7268 protected int computeHorizontalScrollOffset() { 7269 return mScrollX; 7270 } 7271 7272 /** 7273 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 7274 * within the horizontal range. This value is used to compute the length 7275 * of the thumb within the scrollbar's track.</p> 7276 * 7277 * <p>The range is expressed in arbitrary units that must be the same as the 7278 * units used by {@link #computeHorizontalScrollRange()} and 7279 * {@link #computeHorizontalScrollOffset()}.</p> 7280 * 7281 * <p>The default extent is the drawing width of this view.</p> 7282 * 7283 * @return the horizontal extent of the scrollbar's thumb 7284 * 7285 * @see #computeHorizontalScrollRange() 7286 * @see #computeHorizontalScrollOffset() 7287 * @see android.widget.ScrollBarDrawable 7288 */ 7289 protected int computeHorizontalScrollExtent() { 7290 return getWidth(); 7291 } 7292 7293 /** 7294 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 7295 * 7296 * <p>The range is expressed in arbitrary units that must be the same as the 7297 * units used by {@link #computeVerticalScrollExtent()} and 7298 * {@link #computeVerticalScrollOffset()}.</p> 7299 * 7300 * @return the total vertical range represented by the vertical scrollbar 7301 * 7302 * <p>The default range is the drawing height of this view.</p> 7303 * 7304 * @see #computeVerticalScrollExtent() 7305 * @see #computeVerticalScrollOffset() 7306 * @see android.widget.ScrollBarDrawable 7307 */ 7308 protected int computeVerticalScrollRange() { 7309 return getHeight(); 7310 } 7311 7312 /** 7313 * <p>Compute the vertical offset of the vertical scrollbar's thumb 7314 * within the horizontal range. This value is used to compute the position 7315 * of the thumb within the scrollbar's track.</p> 7316 * 7317 * <p>The range is expressed in arbitrary units that must be the same as the 7318 * units used by {@link #computeVerticalScrollRange()} and 7319 * {@link #computeVerticalScrollExtent()}.</p> 7320 * 7321 * <p>The default offset is the scroll offset of this view.</p> 7322 * 7323 * @return the vertical offset of the scrollbar's thumb 7324 * 7325 * @see #computeVerticalScrollRange() 7326 * @see #computeVerticalScrollExtent() 7327 * @see android.widget.ScrollBarDrawable 7328 */ 7329 protected int computeVerticalScrollOffset() { 7330 return mScrollY; 7331 } 7332 7333 /** 7334 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 7335 * within the vertical range. This value is used to compute the length 7336 * of the thumb within the scrollbar's track.</p> 7337 * 7338 * <p>The range is expressed in arbitrary units that must be the same as the 7339 * units used by {@link #computeVerticalScrollRange()} and 7340 * {@link #computeVerticalScrollOffset()}.</p> 7341 * 7342 * <p>The default extent is the drawing height of this view.</p> 7343 * 7344 * @return the vertical extent of the scrollbar's thumb 7345 * 7346 * @see #computeVerticalScrollRange() 7347 * @see #computeVerticalScrollOffset() 7348 * @see android.widget.ScrollBarDrawable 7349 */ 7350 protected int computeVerticalScrollExtent() { 7351 return getHeight(); 7352 } 7353 7354 /** 7355 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 7356 * scrollbars are painted only if they have been awakened first.</p> 7357 * 7358 * @param canvas the canvas on which to draw the scrollbars 7359 * 7360 * @see #awakenScrollBars(int) 7361 */ 7362 protected final void onDrawScrollBars(Canvas canvas) { 7363 // scrollbars are drawn only when the animation is running 7364 final ScrollabilityCache cache = mScrollCache; 7365 if (cache != null) { 7366 7367 int state = cache.state; 7368 7369 if (state == ScrollabilityCache.OFF) { 7370 return; 7371 } 7372 7373 boolean invalidate = false; 7374 7375 if (state == ScrollabilityCache.FADING) { 7376 // We're fading -- get our fade interpolation 7377 if (cache.interpolatorValues == null) { 7378 cache.interpolatorValues = new float[1]; 7379 } 7380 7381 float[] values = cache.interpolatorValues; 7382 7383 // Stops the animation if we're done 7384 if (cache.scrollBarInterpolator.timeToValues(values) == 7385 Interpolator.Result.FREEZE_END) { 7386 cache.state = ScrollabilityCache.OFF; 7387 } else { 7388 cache.scrollBar.setAlpha(Math.round(values[0])); 7389 } 7390 7391 // This will make the scroll bars inval themselves after 7392 // drawing. We only want this when we're fading so that 7393 // we prevent excessive redraws 7394 invalidate = true; 7395 } else { 7396 // We're just on -- but we may have been fading before so 7397 // reset alpha 7398 cache.scrollBar.setAlpha(255); 7399 } 7400 7401 7402 final int viewFlags = mViewFlags; 7403 7404 final boolean drawHorizontalScrollBar = 7405 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7406 final boolean drawVerticalScrollBar = 7407 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 7408 && !isVerticalScrollBarHidden(); 7409 7410 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 7411 final int width = mRight - mLeft; 7412 final int height = mBottom - mTop; 7413 7414 final ScrollBarDrawable scrollBar = cache.scrollBar; 7415 int size = scrollBar.getSize(false); 7416 if (size <= 0) { 7417 size = cache.scrollBarSize; 7418 } 7419 7420 final int scrollX = mScrollX; 7421 final int scrollY = mScrollY; 7422 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 7423 7424 int left, top, right, bottom; 7425 7426 if (drawHorizontalScrollBar) { 7427 scrollBar.setParameters(computeHorizontalScrollRange(), 7428 computeHorizontalScrollOffset(), 7429 computeHorizontalScrollExtent(), false); 7430 final int verticalScrollBarGap = drawVerticalScrollBar ? 7431 getVerticalScrollbarWidth() : 0; 7432 top = scrollY + height - size - (mUserPaddingBottom & inside); 7433 left = scrollX + (mPaddingLeft & inside); 7434 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 7435 bottom = top + size; 7436 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 7437 if (invalidate) { 7438 invalidate(left, top, right, bottom); 7439 } 7440 } 7441 7442 if (drawVerticalScrollBar) { 7443 scrollBar.setParameters(computeVerticalScrollRange(), 7444 computeVerticalScrollOffset(), 7445 computeVerticalScrollExtent(), true); 7446 switch (mVerticalScrollbarPosition) { 7447 default: 7448 case SCROLLBAR_POSITION_DEFAULT: 7449 case SCROLLBAR_POSITION_RIGHT: 7450 left = scrollX + width - size - (mUserPaddingRight & inside); 7451 break; 7452 case SCROLLBAR_POSITION_LEFT: 7453 left = scrollX + (mUserPaddingLeft & inside); 7454 break; 7455 } 7456 top = scrollY + (mPaddingTop & inside); 7457 right = left + size; 7458 bottom = scrollY + height - (mUserPaddingBottom & inside); 7459 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 7460 if (invalidate) { 7461 invalidate(left, top, right, bottom); 7462 } 7463 } 7464 } 7465 } 7466 } 7467 7468 /** 7469 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 7470 * FastScroller is visible. 7471 * @return whether to temporarily hide the vertical scrollbar 7472 * @hide 7473 */ 7474 protected boolean isVerticalScrollBarHidden() { 7475 return false; 7476 } 7477 7478 /** 7479 * <p>Draw the horizontal scrollbar if 7480 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 7481 * 7482 * @param canvas the canvas on which to draw the scrollbar 7483 * @param scrollBar the scrollbar's drawable 7484 * 7485 * @see #isHorizontalScrollBarEnabled() 7486 * @see #computeHorizontalScrollRange() 7487 * @see #computeHorizontalScrollExtent() 7488 * @see #computeHorizontalScrollOffset() 7489 * @see android.widget.ScrollBarDrawable 7490 * @hide 7491 */ 7492 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 7493 int l, int t, int r, int b) { 7494 scrollBar.setBounds(l, t, r, b); 7495 scrollBar.draw(canvas); 7496 } 7497 7498 /** 7499 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 7500 * returns true.</p> 7501 * 7502 * @param canvas the canvas on which to draw the scrollbar 7503 * @param scrollBar the scrollbar's drawable 7504 * 7505 * @see #isVerticalScrollBarEnabled() 7506 * @see #computeVerticalScrollRange() 7507 * @see #computeVerticalScrollExtent() 7508 * @see #computeVerticalScrollOffset() 7509 * @see android.widget.ScrollBarDrawable 7510 * @hide 7511 */ 7512 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 7513 int l, int t, int r, int b) { 7514 scrollBar.setBounds(l, t, r, b); 7515 scrollBar.draw(canvas); 7516 } 7517 7518 /** 7519 * Implement this to do your drawing. 7520 * 7521 * @param canvas the canvas on which the background will be drawn 7522 */ 7523 protected void onDraw(Canvas canvas) { 7524 } 7525 7526 /* 7527 * Caller is responsible for calling requestLayout if necessary. 7528 * (This allows addViewInLayout to not request a new layout.) 7529 */ 7530 void assignParent(ViewParent parent) { 7531 if (mParent == null) { 7532 mParent = parent; 7533 } else if (parent == null) { 7534 mParent = null; 7535 } else { 7536 throw new RuntimeException("view " + this + " being added, but" 7537 + " it already has a parent"); 7538 } 7539 } 7540 7541 /** 7542 * This is called when the view is attached to a window. At this point it 7543 * has a Surface and will start drawing. Note that this function is 7544 * guaranteed to be called before {@link #onDraw}, however it may be called 7545 * any time before the first onDraw -- including before or after 7546 * {@link #onMeasure}. 7547 * 7548 * @see #onDetachedFromWindow() 7549 */ 7550 protected void onAttachedToWindow() { 7551 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 7552 mParent.requestTransparentRegion(this); 7553 } 7554 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 7555 initialAwakenScrollBars(); 7556 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 7557 } 7558 jumpDrawablesToCurrentState(); 7559 } 7560 7561 /** 7562 * This is called when the view is detached from a window. At this point it 7563 * no longer has a surface for drawing. 7564 * 7565 * @see #onAttachedToWindow() 7566 */ 7567 protected void onDetachedFromWindow() { 7568 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 7569 7570 removeUnsetPressCallback(); 7571 removeLongPressCallback(); 7572 7573 destroyDrawingCache(); 7574 7575 if (mHardwareLayer != null) { 7576 mHardwareLayer.destroy(); 7577 mHardwareLayer = null; 7578 } 7579 } 7580 7581 /** 7582 * @return The number of times this view has been attached to a window 7583 */ 7584 protected int getWindowAttachCount() { 7585 return mWindowAttachCount; 7586 } 7587 7588 /** 7589 * Retrieve a unique token identifying the window this view is attached to. 7590 * @return Return the window's token for use in 7591 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 7592 */ 7593 public IBinder getWindowToken() { 7594 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 7595 } 7596 7597 /** 7598 * Retrieve a unique token identifying the top-level "real" window of 7599 * the window that this view is attached to. That is, this is like 7600 * {@link #getWindowToken}, except if the window this view in is a panel 7601 * window (attached to another containing window), then the token of 7602 * the containing window is returned instead. 7603 * 7604 * @return Returns the associated window token, either 7605 * {@link #getWindowToken()} or the containing window's token. 7606 */ 7607 public IBinder getApplicationWindowToken() { 7608 AttachInfo ai = mAttachInfo; 7609 if (ai != null) { 7610 IBinder appWindowToken = ai.mPanelParentWindowToken; 7611 if (appWindowToken == null) { 7612 appWindowToken = ai.mWindowToken; 7613 } 7614 return appWindowToken; 7615 } 7616 return null; 7617 } 7618 7619 /** 7620 * Retrieve private session object this view hierarchy is using to 7621 * communicate with the window manager. 7622 * @return the session object to communicate with the window manager 7623 */ 7624 /*package*/ IWindowSession getWindowSession() { 7625 return mAttachInfo != null ? mAttachInfo.mSession : null; 7626 } 7627 7628 /** 7629 * @param info the {@link android.view.View.AttachInfo} to associated with 7630 * this view 7631 */ 7632 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 7633 //System.out.println("Attached! " + this); 7634 mAttachInfo = info; 7635 mWindowAttachCount++; 7636 // We will need to evaluate the drawable state at least once. 7637 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 7638 if (mFloatingTreeObserver != null) { 7639 info.mTreeObserver.merge(mFloatingTreeObserver); 7640 mFloatingTreeObserver = null; 7641 } 7642 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 7643 mAttachInfo.mScrollContainers.add(this); 7644 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 7645 } 7646 performCollectViewAttributes(visibility); 7647 onAttachedToWindow(); 7648 int vis = info.mWindowVisibility; 7649 if (vis != GONE) { 7650 onWindowVisibilityChanged(vis); 7651 } 7652 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 7653 // If nobody has evaluated the drawable state yet, then do it now. 7654 refreshDrawableState(); 7655 } 7656 } 7657 7658 void dispatchDetachedFromWindow() { 7659 //System.out.println("Detached! " + this); 7660 AttachInfo info = mAttachInfo; 7661 if (info != null) { 7662 int vis = info.mWindowVisibility; 7663 if (vis != GONE) { 7664 onWindowVisibilityChanged(GONE); 7665 } 7666 } 7667 7668 onDetachedFromWindow(); 7669 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 7670 mAttachInfo.mScrollContainers.remove(this); 7671 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 7672 } 7673 mAttachInfo = null; 7674 } 7675 7676 /** 7677 * Store this view hierarchy's frozen state into the given container. 7678 * 7679 * @param container The SparseArray in which to save the view's state. 7680 * 7681 * @see #restoreHierarchyState 7682 * @see #dispatchSaveInstanceState 7683 * @see #onSaveInstanceState 7684 */ 7685 public void saveHierarchyState(SparseArray<Parcelable> container) { 7686 dispatchSaveInstanceState(container); 7687 } 7688 7689 /** 7690 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 7691 * May be overridden to modify how freezing happens to a view's children; for example, some 7692 * views may want to not store state for their children. 7693 * 7694 * @param container The SparseArray in which to save the view's state. 7695 * 7696 * @see #dispatchRestoreInstanceState 7697 * @see #saveHierarchyState 7698 * @see #onSaveInstanceState 7699 */ 7700 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 7701 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 7702 mPrivateFlags &= ~SAVE_STATE_CALLED; 7703 Parcelable state = onSaveInstanceState(); 7704 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7705 throw new IllegalStateException( 7706 "Derived class did not call super.onSaveInstanceState()"); 7707 } 7708 if (state != null) { 7709 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 7710 // + ": " + state); 7711 container.put(mID, state); 7712 } 7713 } 7714 } 7715 7716 /** 7717 * Hook allowing a view to generate a representation of its internal state 7718 * that can later be used to create a new instance with that same state. 7719 * This state should only contain information that is not persistent or can 7720 * not be reconstructed later. For example, you will never store your 7721 * current position on screen because that will be computed again when a 7722 * new instance of the view is placed in its view hierarchy. 7723 * <p> 7724 * Some examples of things you may store here: the current cursor position 7725 * in a text view (but usually not the text itself since that is stored in a 7726 * content provider or other persistent storage), the currently selected 7727 * item in a list view. 7728 * 7729 * @return Returns a Parcelable object containing the view's current dynamic 7730 * state, or null if there is nothing interesting to save. The 7731 * default implementation returns null. 7732 * @see #onRestoreInstanceState 7733 * @see #saveHierarchyState 7734 * @see #dispatchSaveInstanceState 7735 * @see #setSaveEnabled(boolean) 7736 */ 7737 protected Parcelable onSaveInstanceState() { 7738 mPrivateFlags |= SAVE_STATE_CALLED; 7739 return BaseSavedState.EMPTY_STATE; 7740 } 7741 7742 /** 7743 * Restore this view hierarchy's frozen state from the given container. 7744 * 7745 * @param container The SparseArray which holds previously frozen states. 7746 * 7747 * @see #saveHierarchyState 7748 * @see #dispatchRestoreInstanceState 7749 * @see #onRestoreInstanceState 7750 */ 7751 public void restoreHierarchyState(SparseArray<Parcelable> container) { 7752 dispatchRestoreInstanceState(container); 7753 } 7754 7755 /** 7756 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 7757 * children. May be overridden to modify how restoreing happens to a view's children; for 7758 * example, some views may want to not store state for their children. 7759 * 7760 * @param container The SparseArray which holds previously saved state. 7761 * 7762 * @see #dispatchSaveInstanceState 7763 * @see #restoreHierarchyState 7764 * @see #onRestoreInstanceState 7765 */ 7766 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 7767 if (mID != NO_ID) { 7768 Parcelable state = container.get(mID); 7769 if (state != null) { 7770 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 7771 // + ": " + state); 7772 mPrivateFlags &= ~SAVE_STATE_CALLED; 7773 onRestoreInstanceState(state); 7774 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7775 throw new IllegalStateException( 7776 "Derived class did not call super.onRestoreInstanceState()"); 7777 } 7778 } 7779 } 7780 } 7781 7782 /** 7783 * Hook allowing a view to re-apply a representation of its internal state that had previously 7784 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 7785 * null state. 7786 * 7787 * @param state The frozen state that had previously been returned by 7788 * {@link #onSaveInstanceState}. 7789 * 7790 * @see #onSaveInstanceState 7791 * @see #restoreHierarchyState 7792 * @see #dispatchRestoreInstanceState 7793 */ 7794 protected void onRestoreInstanceState(Parcelable state) { 7795 mPrivateFlags |= SAVE_STATE_CALLED; 7796 if (state != BaseSavedState.EMPTY_STATE && state != null) { 7797 throw new IllegalArgumentException("Wrong state class, expecting View State but " 7798 + "received " + state.getClass().toString() + " instead. This usually happens " 7799 + "when two views of different type have the same id in the same hierarchy. " 7800 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 7801 + "other views do not use the same id."); 7802 } 7803 } 7804 7805 /** 7806 * <p>Return the time at which the drawing of the view hierarchy started.</p> 7807 * 7808 * @return the drawing start time in milliseconds 7809 */ 7810 public long getDrawingTime() { 7811 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 7812 } 7813 7814 /** 7815 * <p>Enables or disables the duplication of the parent's state into this view. When 7816 * duplication is enabled, this view gets its drawable state from its parent rather 7817 * than from its own internal properties.</p> 7818 * 7819 * <p>Note: in the current implementation, setting this property to true after the 7820 * view was added to a ViewGroup might have no effect at all. This property should 7821 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 7822 * 7823 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 7824 * property is enabled, an exception will be thrown.</p> 7825 * 7826 * @param enabled True to enable duplication of the parent's drawable state, false 7827 * to disable it. 7828 * 7829 * @see #getDrawableState() 7830 * @see #isDuplicateParentStateEnabled() 7831 */ 7832 public void setDuplicateParentStateEnabled(boolean enabled) { 7833 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 7834 } 7835 7836 /** 7837 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 7838 * 7839 * @return True if this view's drawable state is duplicated from the parent, 7840 * false otherwise 7841 * 7842 * @see #getDrawableState() 7843 * @see #setDuplicateParentStateEnabled(boolean) 7844 */ 7845 public boolean isDuplicateParentStateEnabled() { 7846 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 7847 } 7848 7849 /** 7850 * <p>Specifies the type of layer backing this view. The layer can be 7851 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 7852 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 7853 * 7854 * <p>A layer is associated with an optional {@link android.graphics.Paint} 7855 * instance that controls how the layer is composed on screen. The following 7856 * properties of the paint are taken into account when composing the layer:</p> 7857 * <ul> 7858 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 7859 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 7860 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 7861 * </ul> 7862 * 7863 * <p>If this view has an alpha value set to < 1.0 by calling 7864 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 7865 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 7866 * equivalent to setting a hardware layer on this view and providing a paint with 7867 * the desired alpha value.<p> 7868 * 7869 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 7870 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 7871 * for more information on when and how to use layers.</p> 7872 * 7873 * @param layerType The ype of layer to use with this view, must be one of 7874 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7875 * {@link #LAYER_TYPE_HARDWARE} 7876 * @param paint The paint used to compose the layer. This argument is optional 7877 * and can be null. It is ignored when the layer type is 7878 * {@link #LAYER_TYPE_NONE} 7879 * 7880 * @see #getLayerType() 7881 * @see #LAYER_TYPE_NONE 7882 * @see #LAYER_TYPE_SOFTWARE 7883 * @see #LAYER_TYPE_HARDWARE 7884 * @see #setAlpha(float) 7885 * 7886 * @attr ref android.R.styleable#View_layerType 7887 */ 7888 public void setLayerType(int layerType, Paint paint) { 7889 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 7890 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 7891 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 7892 } 7893 7894 if (layerType == mLayerType) return; 7895 7896 // Destroy any previous software drawing cache if needed 7897 switch (mLayerType) { 7898 case LAYER_TYPE_SOFTWARE: 7899 if (mDrawingCache != null) { 7900 mDrawingCache.recycle(); 7901 mDrawingCache = null; 7902 } 7903 7904 if (mUnscaledDrawingCache != null) { 7905 mUnscaledDrawingCache.recycle(); 7906 mUnscaledDrawingCache = null; 7907 } 7908 break; 7909 case LAYER_TYPE_HARDWARE: 7910 if (mHardwareLayer != null) { 7911 mHardwareLayer.destroy(); 7912 mHardwareLayer = null; 7913 } 7914 break; 7915 default: 7916 break; 7917 } 7918 7919 mLayerType = layerType; 7920 mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : paint; 7921 7922 // TODO: Make sure we invalidate the parent's display list 7923 invalidate(); 7924 } 7925 7926 /** 7927 * Indicates what type of layer is currently associated with this view. By default 7928 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 7929 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 7930 * for more information on the different types of layers. 7931 * 7932 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7933 * {@link #LAYER_TYPE_HARDWARE} 7934 * 7935 * @see #setLayerType(int, android.graphics.Paint) 7936 * @see #LAYER_TYPE_NONE 7937 * @see #LAYER_TYPE_SOFTWARE 7938 * @see #LAYER_TYPE_HARDWARE 7939 */ 7940 public int getLayerType() { 7941 return mLayerType; 7942 } 7943 7944 /** 7945 * <p>Returns a hardware layer that can be used to draw this view again 7946 * without executing its draw method.</p> 7947 * 7948 * @return A HardwareLayer ready to render, or null if an error occurred. 7949 */ 7950 HardwareLayer getHardwareLayer(Canvas currentCanvas) { 7951 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 7952 return null; 7953 } 7954 7955 final int width = mRight - mLeft; 7956 final int height = mBottom - mTop; 7957 7958 if (width == 0 || height == 0) { 7959 return null; 7960 } 7961 7962 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 7963 if (mHardwareLayer == null) { 7964 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 7965 width, height, isOpaque()); 7966 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 7967 mHardwareLayer.resize(width, height); 7968 } 7969 7970 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 7971 try { 7972 canvas.setViewport(width, height); 7973 canvas.onPreDraw(); 7974 7975 computeScroll(); 7976 canvas.translate(-mScrollX, -mScrollY); 7977 7978 final int restoreCount = canvas.save(); 7979 7980 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 7981 7982 // Fast path for layouts with no backgrounds 7983 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 7984 mPrivateFlags &= ~DIRTY_MASK; 7985 dispatchDraw(canvas); 7986 } else { 7987 draw(canvas); 7988 } 7989 7990 canvas.restoreToCount(restoreCount); 7991 } finally { 7992 canvas.onPostDraw(); 7993 mHardwareLayer.end(currentCanvas); 7994 } 7995 } 7996 7997 return mHardwareLayer; 7998 } 7999 8000 /** 8001 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 8002 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 8003 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 8004 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 8005 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 8006 * null.</p> 8007 * 8008 * <p>Enabling the drawing cache is similar to 8009 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 8010 * acceleration is turned off. When hardware acceleration is turned on enabling the 8011 * drawing cache has either no effect or the cache used at drawing time is not a bitmap. 8012 * This API can however be used to manually generate a bitmap copy of this view.</p> 8013 * 8014 * @param enabled true to enable the drawing cache, false otherwise 8015 * 8016 * @see #isDrawingCacheEnabled() 8017 * @see #getDrawingCache() 8018 * @see #buildDrawingCache() 8019 * @see #setLayerType(int, android.graphics.Paint) 8020 */ 8021 public void setDrawingCacheEnabled(boolean enabled) { 8022 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 8023 } 8024 8025 /** 8026 * <p>Indicates whether the drawing cache is enabled for this view.</p> 8027 * 8028 * @return true if the drawing cache is enabled 8029 * 8030 * @see #setDrawingCacheEnabled(boolean) 8031 * @see #getDrawingCache() 8032 */ 8033 @ViewDebug.ExportedProperty(category = "drawing") 8034 public boolean isDrawingCacheEnabled() { 8035 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 8036 } 8037 8038 /** 8039 * <p>Returns a display list that can be used to draw this view again 8040 * without executing its draw method.</p> 8041 * 8042 * @return A DisplayList ready to replay, or null if caching is not enabled. 8043 */ 8044 DisplayList getDisplayList() { 8045 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8046 return null; 8047 } 8048 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8049 return null; 8050 } 8051 8052 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED && 8053 ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 8054 mDisplayList == null || !mDisplayList.isValid())) { 8055 8056 if (mDisplayList == null) { 8057 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 8058 } 8059 8060 final HardwareCanvas canvas = mDisplayList.start(); 8061 try { 8062 int width = mRight - mLeft; 8063 int height = mBottom - mTop; 8064 8065 canvas.setViewport(width, height); 8066 canvas.onPreDraw(); 8067 8068 final int restoreCount = canvas.save(); 8069 8070 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8071 8072 // Fast path for layouts with no backgrounds 8073 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8074 mPrivateFlags &= ~DIRTY_MASK; 8075 dispatchDraw(canvas); 8076 } else { 8077 draw(canvas); 8078 } 8079 8080 canvas.restoreToCount(restoreCount); 8081 } finally { 8082 canvas.onPostDraw(); 8083 8084 mDisplayList.end(); 8085 } 8086 } 8087 8088 return mDisplayList; 8089 } 8090 8091 /** 8092 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 8093 * 8094 * @return A non-scaled bitmap representing this view or null if cache is disabled. 8095 * 8096 * @see #getDrawingCache(boolean) 8097 */ 8098 public Bitmap getDrawingCache() { 8099 return getDrawingCache(false); 8100 } 8101 8102 /** 8103 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 8104 * is null when caching is disabled. If caching is enabled and the cache is not ready, 8105 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 8106 * draw from the cache when the cache is enabled. To benefit from the cache, you must 8107 * request the drawing cache by calling this method and draw it on screen if the 8108 * returned bitmap is not null.</p> 8109 * 8110 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8111 * this method will create a bitmap of the same size as this view. Because this bitmap 8112 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8113 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8114 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8115 * size than the view. This implies that your application must be able to handle this 8116 * size.</p> 8117 * 8118 * @param autoScale Indicates whether the generated bitmap should be scaled based on 8119 * the current density of the screen when the application is in compatibility 8120 * mode. 8121 * 8122 * @return A bitmap representing this view or null if cache is disabled. 8123 * 8124 * @see #setDrawingCacheEnabled(boolean) 8125 * @see #isDrawingCacheEnabled() 8126 * @see #buildDrawingCache(boolean) 8127 * @see #destroyDrawingCache() 8128 */ 8129 public Bitmap getDrawingCache(boolean autoScale) { 8130 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8131 return null; 8132 } 8133 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 8134 buildDrawingCache(autoScale); 8135 } 8136 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 8137 } 8138 8139 /** 8140 * <p>Frees the resources used by the drawing cache. If you call 8141 * {@link #buildDrawingCache()} manually without calling 8142 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8143 * should cleanup the cache with this method afterwards.</p> 8144 * 8145 * @see #setDrawingCacheEnabled(boolean) 8146 * @see #buildDrawingCache() 8147 * @see #getDrawingCache() 8148 */ 8149 public void destroyDrawingCache() { 8150 if (mDrawingCache != null) { 8151 mDrawingCache.recycle(); 8152 mDrawingCache = null; 8153 } 8154 if (mUnscaledDrawingCache != null) { 8155 mUnscaledDrawingCache.recycle(); 8156 mUnscaledDrawingCache = null; 8157 } 8158 if (mDisplayList != null) { 8159 mDisplayList.invalidate(); 8160 } 8161 } 8162 8163 /** 8164 * Setting a solid background color for the drawing cache's bitmaps will improve 8165 * perfromance and memory usage. Note, though that this should only be used if this 8166 * view will always be drawn on top of a solid color. 8167 * 8168 * @param color The background color to use for the drawing cache's bitmap 8169 * 8170 * @see #setDrawingCacheEnabled(boolean) 8171 * @see #buildDrawingCache() 8172 * @see #getDrawingCache() 8173 */ 8174 public void setDrawingCacheBackgroundColor(int color) { 8175 if (color != mDrawingCacheBackgroundColor) { 8176 mDrawingCacheBackgroundColor = color; 8177 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8178 } 8179 } 8180 8181 /** 8182 * @see #setDrawingCacheBackgroundColor(int) 8183 * 8184 * @return The background color to used for the drawing cache's bitmap 8185 */ 8186 public int getDrawingCacheBackgroundColor() { 8187 return mDrawingCacheBackgroundColor; 8188 } 8189 8190 /** 8191 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 8192 * 8193 * @see #buildDrawingCache(boolean) 8194 */ 8195 public void buildDrawingCache() { 8196 buildDrawingCache(false); 8197 } 8198 8199 /** 8200 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 8201 * 8202 * <p>If you call {@link #buildDrawingCache()} manually without calling 8203 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8204 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 8205 * 8206 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8207 * this method will create a bitmap of the same size as this view. Because this bitmap 8208 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8209 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8210 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8211 * size than the view. This implies that your application must be able to handle this 8212 * size.</p> 8213 * 8214 * <p>You should avoid calling this method when hardware acceleration is enabled. If 8215 * you do not need the drawing cache bitmap, calling this method will increase memory 8216 * usage and cause the view to be rendered in software once, thus negatively impacting 8217 * performance.</p> 8218 * 8219 * @see #getDrawingCache() 8220 * @see #destroyDrawingCache() 8221 */ 8222 public void buildDrawingCache(boolean autoScale) { 8223 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 8224 mDrawingCache == null : mUnscaledDrawingCache == null)) { 8225 8226 if (ViewDebug.TRACE_HIERARCHY) { 8227 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 8228 } 8229 8230 int width = mRight - mLeft; 8231 int height = mBottom - mTop; 8232 8233 final AttachInfo attachInfo = mAttachInfo; 8234 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 8235 8236 if (autoScale && scalingRequired) { 8237 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 8238 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 8239 } 8240 8241 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 8242 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 8243 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 8244 8245 if (width <= 0 || height <= 0 || 8246 // Projected bitmap size in bytes 8247 (width * height * (opaque && !use32BitCache ? 2 : 4) > 8248 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 8249 destroyDrawingCache(); 8250 return; 8251 } 8252 8253 boolean clear = true; 8254 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 8255 8256 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 8257 Bitmap.Config quality; 8258 if (!opaque) { 8259 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 8260 case DRAWING_CACHE_QUALITY_AUTO: 8261 quality = Bitmap.Config.ARGB_8888; 8262 break; 8263 case DRAWING_CACHE_QUALITY_LOW: 8264 quality = Bitmap.Config.ARGB_4444; 8265 break; 8266 case DRAWING_CACHE_QUALITY_HIGH: 8267 quality = Bitmap.Config.ARGB_8888; 8268 break; 8269 default: 8270 quality = Bitmap.Config.ARGB_8888; 8271 break; 8272 } 8273 } else { 8274 // Optimization for translucent windows 8275 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 8276 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 8277 } 8278 8279 // Try to cleanup memory 8280 if (bitmap != null) bitmap.recycle(); 8281 8282 try { 8283 bitmap = Bitmap.createBitmap(width, height, quality); 8284 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8285 if (autoScale) { 8286 mDrawingCache = bitmap; 8287 } else { 8288 mUnscaledDrawingCache = bitmap; 8289 } 8290 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 8291 } catch (OutOfMemoryError e) { 8292 // If there is not enough memory to create the bitmap cache, just 8293 // ignore the issue as bitmap caches are not required to draw the 8294 // view hierarchy 8295 if (autoScale) { 8296 mDrawingCache = null; 8297 } else { 8298 mUnscaledDrawingCache = null; 8299 } 8300 return; 8301 } 8302 8303 clear = drawingCacheBackgroundColor != 0; 8304 } 8305 8306 Canvas canvas; 8307 if (attachInfo != null) { 8308 canvas = attachInfo.mCanvas; 8309 if (canvas == null) { 8310 canvas = new Canvas(); 8311 } 8312 canvas.setBitmap(bitmap); 8313 // Temporarily clobber the cached Canvas in case one of our children 8314 // is also using a drawing cache. Without this, the children would 8315 // steal the canvas by attaching their own bitmap to it and bad, bad 8316 // thing would happen (invisible views, corrupted drawings, etc.) 8317 attachInfo.mCanvas = null; 8318 } else { 8319 // This case should hopefully never or seldom happen 8320 canvas = new Canvas(bitmap); 8321 } 8322 8323 if (clear) { 8324 bitmap.eraseColor(drawingCacheBackgroundColor); 8325 } 8326 8327 computeScroll(); 8328 final int restoreCount = canvas.save(); 8329 8330 if (autoScale && scalingRequired) { 8331 final float scale = attachInfo.mApplicationScale; 8332 canvas.scale(scale, scale); 8333 } 8334 8335 canvas.translate(-mScrollX, -mScrollY); 8336 8337 mPrivateFlags |= DRAWN; 8338 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 8339 mLayerType != LAYER_TYPE_NONE) { 8340 mPrivateFlags |= DRAWING_CACHE_VALID; 8341 } 8342 8343 // Fast path for layouts with no backgrounds 8344 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8345 if (ViewDebug.TRACE_HIERARCHY) { 8346 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8347 } 8348 mPrivateFlags &= ~DIRTY_MASK; 8349 dispatchDraw(canvas); 8350 } else { 8351 draw(canvas); 8352 } 8353 8354 canvas.restoreToCount(restoreCount); 8355 8356 if (attachInfo != null) { 8357 // Restore the cached Canvas for our siblings 8358 attachInfo.mCanvas = canvas; 8359 } 8360 } 8361 } 8362 8363 /** 8364 * Create a snapshot of the view into a bitmap. We should probably make 8365 * some form of this public, but should think about the API. 8366 */ 8367 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 8368 int width = mRight - mLeft; 8369 int height = mBottom - mTop; 8370 8371 final AttachInfo attachInfo = mAttachInfo; 8372 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 8373 width = (int) ((width * scale) + 0.5f); 8374 height = (int) ((height * scale) + 0.5f); 8375 8376 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 8377 if (bitmap == null) { 8378 throw new OutOfMemoryError(); 8379 } 8380 8381 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8382 8383 Canvas canvas; 8384 if (attachInfo != null) { 8385 canvas = attachInfo.mCanvas; 8386 if (canvas == null) { 8387 canvas = new Canvas(); 8388 } 8389 canvas.setBitmap(bitmap); 8390 // Temporarily clobber the cached Canvas in case one of our children 8391 // is also using a drawing cache. Without this, the children would 8392 // steal the canvas by attaching their own bitmap to it and bad, bad 8393 // things would happen (invisible views, corrupted drawings, etc.) 8394 attachInfo.mCanvas = null; 8395 } else { 8396 // This case should hopefully never or seldom happen 8397 canvas = new Canvas(bitmap); 8398 } 8399 8400 if ((backgroundColor & 0xff000000) != 0) { 8401 bitmap.eraseColor(backgroundColor); 8402 } 8403 8404 computeScroll(); 8405 final int restoreCount = canvas.save(); 8406 canvas.scale(scale, scale); 8407 canvas.translate(-mScrollX, -mScrollY); 8408 8409 // Temporarily remove the dirty mask 8410 int flags = mPrivateFlags; 8411 mPrivateFlags &= ~DIRTY_MASK; 8412 8413 // Fast path for layouts with no backgrounds 8414 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8415 dispatchDraw(canvas); 8416 } else { 8417 draw(canvas); 8418 } 8419 8420 mPrivateFlags = flags; 8421 8422 canvas.restoreToCount(restoreCount); 8423 8424 if (attachInfo != null) { 8425 // Restore the cached Canvas for our siblings 8426 attachInfo.mCanvas = canvas; 8427 } 8428 8429 return bitmap; 8430 } 8431 8432 /** 8433 * Indicates whether this View is currently in edit mode. A View is usually 8434 * in edit mode when displayed within a developer tool. For instance, if 8435 * this View is being drawn by a visual user interface builder, this method 8436 * should return true. 8437 * 8438 * Subclasses should check the return value of this method to provide 8439 * different behaviors if their normal behavior might interfere with the 8440 * host environment. For instance: the class spawns a thread in its 8441 * constructor, the drawing code relies on device-specific features, etc. 8442 * 8443 * This method is usually checked in the drawing code of custom widgets. 8444 * 8445 * @return True if this View is in edit mode, false otherwise. 8446 */ 8447 public boolean isInEditMode() { 8448 return false; 8449 } 8450 8451 /** 8452 * If the View draws content inside its padding and enables fading edges, 8453 * it needs to support padding offsets. Padding offsets are added to the 8454 * fading edges to extend the length of the fade so that it covers pixels 8455 * drawn inside the padding. 8456 * 8457 * Subclasses of this class should override this method if they need 8458 * to draw content inside the padding. 8459 * 8460 * @return True if padding offset must be applied, false otherwise. 8461 * 8462 * @see #getLeftPaddingOffset() 8463 * @see #getRightPaddingOffset() 8464 * @see #getTopPaddingOffset() 8465 * @see #getBottomPaddingOffset() 8466 * 8467 * @since CURRENT 8468 */ 8469 protected boolean isPaddingOffsetRequired() { 8470 return false; 8471 } 8472 8473 /** 8474 * Amount by which to extend the left fading region. Called only when 8475 * {@link #isPaddingOffsetRequired()} returns true. 8476 * 8477 * @return The left padding offset in pixels. 8478 * 8479 * @see #isPaddingOffsetRequired() 8480 * 8481 * @since CURRENT 8482 */ 8483 protected int getLeftPaddingOffset() { 8484 return 0; 8485 } 8486 8487 /** 8488 * Amount by which to extend the right fading region. Called only when 8489 * {@link #isPaddingOffsetRequired()} returns true. 8490 * 8491 * @return The right padding offset in pixels. 8492 * 8493 * @see #isPaddingOffsetRequired() 8494 * 8495 * @since CURRENT 8496 */ 8497 protected int getRightPaddingOffset() { 8498 return 0; 8499 } 8500 8501 /** 8502 * Amount by which to extend the top fading region. Called only when 8503 * {@link #isPaddingOffsetRequired()} returns true. 8504 * 8505 * @return The top padding offset in pixels. 8506 * 8507 * @see #isPaddingOffsetRequired() 8508 * 8509 * @since CURRENT 8510 */ 8511 protected int getTopPaddingOffset() { 8512 return 0; 8513 } 8514 8515 /** 8516 * Amount by which to extend the bottom fading region. Called only when 8517 * {@link #isPaddingOffsetRequired()} returns true. 8518 * 8519 * @return The bottom padding offset in pixels. 8520 * 8521 * @see #isPaddingOffsetRequired() 8522 * 8523 * @since CURRENT 8524 */ 8525 protected int getBottomPaddingOffset() { 8526 return 0; 8527 } 8528 8529 /** 8530 * <p>Indicates whether this view is attached to an hardware accelerated 8531 * window or not.</p> 8532 * 8533 * <p>Even if this method returns true, it does not mean that every call 8534 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 8535 * accelerated {@link android.graphics.Canvas}. For instance, if this view 8536 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 8537 * window is hardware accelerated, 8538 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 8539 * return false, and this method will return true.</p> 8540 * 8541 * @return True if the view is attached to a window and the window is 8542 * hardware accelerated; false in any other case. 8543 */ 8544 public boolean isHardwareAccelerated() { 8545 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 8546 } 8547 8548 /** 8549 * Manually render this view (and all of its children) to the given Canvas. 8550 * The view must have already done a full layout before this function is 8551 * called. When implementing a view, implement {@link #onDraw} instead of 8552 * overriding this method. If you do need to override this method, call 8553 * the superclass version. 8554 * 8555 * @param canvas The Canvas to which the View is rendered. 8556 */ 8557 public void draw(Canvas canvas) { 8558 if (ViewDebug.TRACE_HIERARCHY) { 8559 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8560 } 8561 8562 final int privateFlags = mPrivateFlags; 8563 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 8564 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 8565 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 8566 8567 /* 8568 * Draw traversal performs several drawing steps which must be executed 8569 * in the appropriate order: 8570 * 8571 * 1. Draw the background 8572 * 2. If necessary, save the canvas' layers to prepare for fading 8573 * 3. Draw view's content 8574 * 4. Draw children 8575 * 5. If necessary, draw the fading edges and restore layers 8576 * 6. Draw decorations (scrollbars for instance) 8577 */ 8578 8579 // Step 1, draw the background, if needed 8580 int saveCount; 8581 8582 if (!dirtyOpaque) { 8583 final Drawable background = mBGDrawable; 8584 if (background != null) { 8585 final int scrollX = mScrollX; 8586 final int scrollY = mScrollY; 8587 8588 if (mBackgroundSizeChanged) { 8589 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 8590 mBackgroundSizeChanged = false; 8591 } 8592 8593 if ((scrollX | scrollY) == 0) { 8594 background.draw(canvas); 8595 } else { 8596 canvas.translate(scrollX, scrollY); 8597 background.draw(canvas); 8598 canvas.translate(-scrollX, -scrollY); 8599 } 8600 } 8601 } 8602 8603 // skip step 2 & 5 if possible (common case) 8604 final int viewFlags = mViewFlags; 8605 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 8606 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 8607 if (!verticalEdges && !horizontalEdges) { 8608 // Step 3, draw the content 8609 if (!dirtyOpaque) onDraw(canvas); 8610 8611 // Step 4, draw the children 8612 dispatchDraw(canvas); 8613 8614 // Step 6, draw decorations (scrollbars) 8615 onDrawScrollBars(canvas); 8616 8617 // we're done... 8618 return; 8619 } 8620 8621 /* 8622 * Here we do the full fledged routine... 8623 * (this is an uncommon case where speed matters less, 8624 * this is why we repeat some of the tests that have been 8625 * done above) 8626 */ 8627 8628 boolean drawTop = false; 8629 boolean drawBottom = false; 8630 boolean drawLeft = false; 8631 boolean drawRight = false; 8632 8633 float topFadeStrength = 0.0f; 8634 float bottomFadeStrength = 0.0f; 8635 float leftFadeStrength = 0.0f; 8636 float rightFadeStrength = 0.0f; 8637 8638 // Step 2, save the canvas' layers 8639 int paddingLeft = mPaddingLeft; 8640 int paddingTop = mPaddingTop; 8641 8642 final boolean offsetRequired = isPaddingOffsetRequired(); 8643 if (offsetRequired) { 8644 paddingLeft += getLeftPaddingOffset(); 8645 paddingTop += getTopPaddingOffset(); 8646 } 8647 8648 int left = mScrollX + paddingLeft; 8649 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 8650 int top = mScrollY + paddingTop; 8651 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 8652 8653 if (offsetRequired) { 8654 right += getRightPaddingOffset(); 8655 bottom += getBottomPaddingOffset(); 8656 } 8657 8658 final ScrollabilityCache scrollabilityCache = mScrollCache; 8659 int length = scrollabilityCache.fadingEdgeLength; 8660 8661 // clip the fade length if top and bottom fades overlap 8662 // overlapping fades produce odd-looking artifacts 8663 if (verticalEdges && (top + length > bottom - length)) { 8664 length = (bottom - top) / 2; 8665 } 8666 8667 // also clip horizontal fades if necessary 8668 if (horizontalEdges && (left + length > right - length)) { 8669 length = (right - left) / 2; 8670 } 8671 8672 if (verticalEdges) { 8673 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 8674 drawTop = topFadeStrength > 0.0f; 8675 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 8676 drawBottom = bottomFadeStrength > 0.0f; 8677 } 8678 8679 if (horizontalEdges) { 8680 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 8681 drawLeft = leftFadeStrength > 0.0f; 8682 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 8683 drawRight = rightFadeStrength > 0.0f; 8684 } 8685 8686 saveCount = canvas.getSaveCount(); 8687 8688 int solidColor = getSolidColor(); 8689 if (solidColor == 0) { 8690 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 8691 8692 if (drawTop) { 8693 canvas.saveLayer(left, top, right, top + length, null, flags); 8694 } 8695 8696 if (drawBottom) { 8697 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 8698 } 8699 8700 if (drawLeft) { 8701 canvas.saveLayer(left, top, left + length, bottom, null, flags); 8702 } 8703 8704 if (drawRight) { 8705 canvas.saveLayer(right - length, top, right, bottom, null, flags); 8706 } 8707 } else { 8708 scrollabilityCache.setFadeColor(solidColor); 8709 } 8710 8711 // Step 3, draw the content 8712 if (!dirtyOpaque) onDraw(canvas); 8713 8714 // Step 4, draw the children 8715 dispatchDraw(canvas); 8716 8717 // Step 5, draw the fade effect and restore layers 8718 final Paint p = scrollabilityCache.paint; 8719 final Matrix matrix = scrollabilityCache.matrix; 8720 final Shader fade = scrollabilityCache.shader; 8721 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 8722 8723 if (drawTop) { 8724 matrix.setScale(1, fadeHeight * topFadeStrength); 8725 matrix.postTranslate(left, top); 8726 fade.setLocalMatrix(matrix); 8727 canvas.drawRect(left, top, right, top + length, p); 8728 } 8729 8730 if (drawBottom) { 8731 matrix.setScale(1, fadeHeight * bottomFadeStrength); 8732 matrix.postRotate(180); 8733 matrix.postTranslate(left, bottom); 8734 fade.setLocalMatrix(matrix); 8735 canvas.drawRect(left, bottom - length, right, bottom, p); 8736 } 8737 8738 if (drawLeft) { 8739 matrix.setScale(1, fadeHeight * leftFadeStrength); 8740 matrix.postRotate(-90); 8741 matrix.postTranslate(left, top); 8742 fade.setLocalMatrix(matrix); 8743 canvas.drawRect(left, top, left + length, bottom, p); 8744 } 8745 8746 if (drawRight) { 8747 matrix.setScale(1, fadeHeight * rightFadeStrength); 8748 matrix.postRotate(90); 8749 matrix.postTranslate(right, top); 8750 fade.setLocalMatrix(matrix); 8751 canvas.drawRect(right - length, top, right, bottom, p); 8752 } 8753 8754 canvas.restoreToCount(saveCount); 8755 8756 // Step 6, draw decorations (scrollbars) 8757 onDrawScrollBars(canvas); 8758 } 8759 8760 /** 8761 * Override this if your view is known to always be drawn on top of a solid color background, 8762 * and needs to draw fading edges. Returning a non-zero color enables the view system to 8763 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 8764 * should be set to 0xFF. 8765 * 8766 * @see #setVerticalFadingEdgeEnabled 8767 * @see #setHorizontalFadingEdgeEnabled 8768 * 8769 * @return The known solid color background for this view, or 0 if the color may vary 8770 */ 8771 public int getSolidColor() { 8772 return 0; 8773 } 8774 8775 /** 8776 * Build a human readable string representation of the specified view flags. 8777 * 8778 * @param flags the view flags to convert to a string 8779 * @return a String representing the supplied flags 8780 */ 8781 private static String printFlags(int flags) { 8782 String output = ""; 8783 int numFlags = 0; 8784 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 8785 output += "TAKES_FOCUS"; 8786 numFlags++; 8787 } 8788 8789 switch (flags & VISIBILITY_MASK) { 8790 case INVISIBLE: 8791 if (numFlags > 0) { 8792 output += " "; 8793 } 8794 output += "INVISIBLE"; 8795 // USELESS HERE numFlags++; 8796 break; 8797 case GONE: 8798 if (numFlags > 0) { 8799 output += " "; 8800 } 8801 output += "GONE"; 8802 // USELESS HERE numFlags++; 8803 break; 8804 default: 8805 break; 8806 } 8807 return output; 8808 } 8809 8810 /** 8811 * Build a human readable string representation of the specified private 8812 * view flags. 8813 * 8814 * @param privateFlags the private view flags to convert to a string 8815 * @return a String representing the supplied flags 8816 */ 8817 private static String printPrivateFlags(int privateFlags) { 8818 String output = ""; 8819 int numFlags = 0; 8820 8821 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 8822 output += "WANTS_FOCUS"; 8823 numFlags++; 8824 } 8825 8826 if ((privateFlags & FOCUSED) == FOCUSED) { 8827 if (numFlags > 0) { 8828 output += " "; 8829 } 8830 output += "FOCUSED"; 8831 numFlags++; 8832 } 8833 8834 if ((privateFlags & SELECTED) == SELECTED) { 8835 if (numFlags > 0) { 8836 output += " "; 8837 } 8838 output += "SELECTED"; 8839 numFlags++; 8840 } 8841 8842 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 8843 if (numFlags > 0) { 8844 output += " "; 8845 } 8846 output += "IS_ROOT_NAMESPACE"; 8847 numFlags++; 8848 } 8849 8850 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 8851 if (numFlags > 0) { 8852 output += " "; 8853 } 8854 output += "HAS_BOUNDS"; 8855 numFlags++; 8856 } 8857 8858 if ((privateFlags & DRAWN) == DRAWN) { 8859 if (numFlags > 0) { 8860 output += " "; 8861 } 8862 output += "DRAWN"; 8863 // USELESS HERE numFlags++; 8864 } 8865 return output; 8866 } 8867 8868 /** 8869 * <p>Indicates whether or not this view's layout will be requested during 8870 * the next hierarchy layout pass.</p> 8871 * 8872 * @return true if the layout will be forced during next layout pass 8873 */ 8874 public boolean isLayoutRequested() { 8875 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 8876 } 8877 8878 /** 8879 * Assign a size and position to a view and all of its 8880 * descendants 8881 * 8882 * <p>This is the second phase of the layout mechanism. 8883 * (The first is measuring). In this phase, each parent calls 8884 * layout on all of its children to position them. 8885 * This is typically done using the child measurements 8886 * that were stored in the measure pass().</p> 8887 * 8888 * <p>Derived classes should not override this method. 8889 * Derived classes with children should override 8890 * onLayout. In that method, they should 8891 * call layout on each of their children.</p> 8892 * 8893 * @param l Left position, relative to parent 8894 * @param t Top position, relative to parent 8895 * @param r Right position, relative to parent 8896 * @param b Bottom position, relative to parent 8897 */ 8898 @SuppressWarnings({"unchecked"}) 8899 public void layout(int l, int t, int r, int b) { 8900 int oldL = mLeft; 8901 int oldT = mTop; 8902 int oldB = mBottom; 8903 int oldR = mRight; 8904 boolean changed = setFrame(l, t, r, b); 8905 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 8906 if (ViewDebug.TRACE_HIERARCHY) { 8907 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 8908 } 8909 8910 onLayout(changed, l, t, r, b); 8911 mPrivateFlags &= ~LAYOUT_REQUIRED; 8912 8913 if (mOnLayoutChangeListeners != null) { 8914 ArrayList<OnLayoutChangeListener> listenersCopy = 8915 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 8916 int numListeners = listenersCopy.size(); 8917 for (int i = 0; i < numListeners; ++i) { 8918 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 8919 } 8920 } 8921 } 8922 mPrivateFlags &= ~FORCE_LAYOUT; 8923 } 8924 8925 /** 8926 * Called from layout when this view should 8927 * assign a size and position to each of its children. 8928 * 8929 * Derived classes with children should override 8930 * this method and call layout on each of 8931 * their children. 8932 * @param changed This is a new size or position for this view 8933 * @param left Left position, relative to parent 8934 * @param top Top position, relative to parent 8935 * @param right Right position, relative to parent 8936 * @param bottom Bottom position, relative to parent 8937 */ 8938 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 8939 } 8940 8941 /** 8942 * Assign a size and position to this view. 8943 * 8944 * This is called from layout. 8945 * 8946 * @param left Left position, relative to parent 8947 * @param top Top position, relative to parent 8948 * @param right Right position, relative to parent 8949 * @param bottom Bottom position, relative to parent 8950 * @return true if the new size and position are different than the 8951 * previous ones 8952 * {@hide} 8953 */ 8954 protected boolean setFrame(int left, int top, int right, int bottom) { 8955 boolean changed = false; 8956 8957 if (DBG) { 8958 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 8959 + right + "," + bottom + ")"); 8960 } 8961 8962 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 8963 changed = true; 8964 8965 // Remember our drawn bit 8966 int drawn = mPrivateFlags & DRAWN; 8967 8968 // Invalidate our old position 8969 invalidate(); 8970 8971 8972 int oldWidth = mRight - mLeft; 8973 int oldHeight = mBottom - mTop; 8974 8975 mLeft = left; 8976 mTop = top; 8977 mRight = right; 8978 mBottom = bottom; 8979 8980 mPrivateFlags |= HAS_BOUNDS; 8981 8982 int newWidth = right - left; 8983 int newHeight = bottom - top; 8984 8985 if (newWidth != oldWidth || newHeight != oldHeight) { 8986 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8987 // A change in dimension means an auto-centered pivot point changes, too 8988 mMatrixDirty = true; 8989 } 8990 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 8991 } 8992 8993 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 8994 // If we are visible, force the DRAWN bit to on so that 8995 // this invalidate will go through (at least to our parent). 8996 // This is because someone may have invalidated this view 8997 // before this call to setFrame came in, thereby clearing 8998 // the DRAWN bit. 8999 mPrivateFlags |= DRAWN; 9000 invalidate(); 9001 } 9002 9003 // Reset drawn bit to original value (invalidate turns it off) 9004 mPrivateFlags |= drawn; 9005 9006 mBackgroundSizeChanged = true; 9007 } 9008 return changed; 9009 } 9010 9011 /** 9012 * Finalize inflating a view from XML. This is called as the last phase 9013 * of inflation, after all child views have been added. 9014 * 9015 * <p>Even if the subclass overrides onFinishInflate, they should always be 9016 * sure to call the super method, so that we get called. 9017 */ 9018 protected void onFinishInflate() { 9019 } 9020 9021 /** 9022 * Returns the resources associated with this view. 9023 * 9024 * @return Resources object. 9025 */ 9026 public Resources getResources() { 9027 return mResources; 9028 } 9029 9030 /** 9031 * Invalidates the specified Drawable. 9032 * 9033 * @param drawable the drawable to invalidate 9034 */ 9035 public void invalidateDrawable(Drawable drawable) { 9036 if (verifyDrawable(drawable)) { 9037 final Rect dirty = drawable.getBounds(); 9038 final int scrollX = mScrollX; 9039 final int scrollY = mScrollY; 9040 9041 invalidate(dirty.left + scrollX, dirty.top + scrollY, 9042 dirty.right + scrollX, dirty.bottom + scrollY); 9043 } 9044 } 9045 9046 /** 9047 * Schedules an action on a drawable to occur at a specified time. 9048 * 9049 * @param who the recipient of the action 9050 * @param what the action to run on the drawable 9051 * @param when the time at which the action must occur. Uses the 9052 * {@link SystemClock#uptimeMillis} timebase. 9053 */ 9054 public void scheduleDrawable(Drawable who, Runnable what, long when) { 9055 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9056 mAttachInfo.mHandler.postAtTime(what, who, when); 9057 } 9058 } 9059 9060 /** 9061 * Cancels a scheduled action on a drawable. 9062 * 9063 * @param who the recipient of the action 9064 * @param what the action to cancel 9065 */ 9066 public void unscheduleDrawable(Drawable who, Runnable what) { 9067 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9068 mAttachInfo.mHandler.removeCallbacks(what, who); 9069 } 9070 } 9071 9072 /** 9073 * Unschedule any events associated with the given Drawable. This can be 9074 * used when selecting a new Drawable into a view, so that the previous 9075 * one is completely unscheduled. 9076 * 9077 * @param who The Drawable to unschedule. 9078 * 9079 * @see #drawableStateChanged 9080 */ 9081 public void unscheduleDrawable(Drawable who) { 9082 if (mAttachInfo != null) { 9083 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 9084 } 9085 } 9086 9087 /** 9088 * If your view subclass is displaying its own Drawable objects, it should 9089 * override this function and return true for any Drawable it is 9090 * displaying. This allows animations for those drawables to be 9091 * scheduled. 9092 * 9093 * <p>Be sure to call through to the super class when overriding this 9094 * function. 9095 * 9096 * @param who The Drawable to verify. Return true if it is one you are 9097 * displaying, else return the result of calling through to the 9098 * super class. 9099 * 9100 * @return boolean If true than the Drawable is being displayed in the 9101 * view; else false and it is not allowed to animate. 9102 * 9103 * @see #unscheduleDrawable 9104 * @see #drawableStateChanged 9105 */ 9106 protected boolean verifyDrawable(Drawable who) { 9107 return who == mBGDrawable; 9108 } 9109 9110 /** 9111 * This function is called whenever the state of the view changes in such 9112 * a way that it impacts the state of drawables being shown. 9113 * 9114 * <p>Be sure to call through to the superclass when overriding this 9115 * function. 9116 * 9117 * @see Drawable#setState 9118 */ 9119 protected void drawableStateChanged() { 9120 Drawable d = mBGDrawable; 9121 if (d != null && d.isStateful()) { 9122 d.setState(getDrawableState()); 9123 } 9124 } 9125 9126 /** 9127 * Call this to force a view to update its drawable state. This will cause 9128 * drawableStateChanged to be called on this view. Views that are interested 9129 * in the new state should call getDrawableState. 9130 * 9131 * @see #drawableStateChanged 9132 * @see #getDrawableState 9133 */ 9134 public void refreshDrawableState() { 9135 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9136 drawableStateChanged(); 9137 9138 ViewParent parent = mParent; 9139 if (parent != null) { 9140 parent.childDrawableStateChanged(this); 9141 } 9142 } 9143 9144 /** 9145 * Return an array of resource IDs of the drawable states representing the 9146 * current state of the view. 9147 * 9148 * @return The current drawable state 9149 * 9150 * @see Drawable#setState 9151 * @see #drawableStateChanged 9152 * @see #onCreateDrawableState 9153 */ 9154 public final int[] getDrawableState() { 9155 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 9156 return mDrawableState; 9157 } else { 9158 mDrawableState = onCreateDrawableState(0); 9159 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 9160 return mDrawableState; 9161 } 9162 } 9163 9164 /** 9165 * Generate the new {@link android.graphics.drawable.Drawable} state for 9166 * this view. This is called by the view 9167 * system when the cached Drawable state is determined to be invalid. To 9168 * retrieve the current state, you should use {@link #getDrawableState}. 9169 * 9170 * @param extraSpace if non-zero, this is the number of extra entries you 9171 * would like in the returned array in which you can place your own 9172 * states. 9173 * 9174 * @return Returns an array holding the current {@link Drawable} state of 9175 * the view. 9176 * 9177 * @see #mergeDrawableStates 9178 */ 9179 protected int[] onCreateDrawableState(int extraSpace) { 9180 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 9181 mParent instanceof View) { 9182 return ((View) mParent).onCreateDrawableState(extraSpace); 9183 } 9184 9185 int[] drawableState; 9186 9187 int privateFlags = mPrivateFlags; 9188 9189 int viewStateIndex = 0; 9190 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 9191 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 9192 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 9193 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 9194 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 9195 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 9196 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested) { 9197 // This is set if HW acceleration is requested, even if the current 9198 // process doesn't allow it. This is just to allow app preview 9199 // windows to better match their app. 9200 viewStateIndex |= VIEW_STATE_ACCELERATED; 9201 } 9202 9203 drawableState = VIEW_STATE_SETS[viewStateIndex]; 9204 9205 //noinspection ConstantIfStatement 9206 if (false) { 9207 Log.i("View", "drawableStateIndex=" + viewStateIndex); 9208 Log.i("View", toString() 9209 + " pressed=" + ((privateFlags & PRESSED) != 0) 9210 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 9211 + " fo=" + hasFocus() 9212 + " sl=" + ((privateFlags & SELECTED) != 0) 9213 + " wf=" + hasWindowFocus() 9214 + ": " + Arrays.toString(drawableState)); 9215 } 9216 9217 if (extraSpace == 0) { 9218 return drawableState; 9219 } 9220 9221 final int[] fullState; 9222 if (drawableState != null) { 9223 fullState = new int[drawableState.length + extraSpace]; 9224 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 9225 } else { 9226 fullState = new int[extraSpace]; 9227 } 9228 9229 return fullState; 9230 } 9231 9232 /** 9233 * Merge your own state values in <var>additionalState</var> into the base 9234 * state values <var>baseState</var> that were returned by 9235 * {@link #onCreateDrawableState}. 9236 * 9237 * @param baseState The base state values returned by 9238 * {@link #onCreateDrawableState}, which will be modified to also hold your 9239 * own additional state values. 9240 * 9241 * @param additionalState The additional state values you would like 9242 * added to <var>baseState</var>; this array is not modified. 9243 * 9244 * @return As a convenience, the <var>baseState</var> array you originally 9245 * passed into the function is returned. 9246 * 9247 * @see #onCreateDrawableState 9248 */ 9249 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 9250 final int N = baseState.length; 9251 int i = N - 1; 9252 while (i >= 0 && baseState[i] == 0) { 9253 i--; 9254 } 9255 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 9256 return baseState; 9257 } 9258 9259 /** 9260 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 9261 * on all Drawable objects associated with this view. 9262 */ 9263 public void jumpDrawablesToCurrentState() { 9264 if (mBGDrawable != null) { 9265 mBGDrawable.jumpToCurrentState(); 9266 } 9267 } 9268 9269 /** 9270 * Sets the background color for this view. 9271 * @param color the color of the background 9272 */ 9273 @RemotableViewMethod 9274 public void setBackgroundColor(int color) { 9275 if (mBGDrawable instanceof ColorDrawable) { 9276 ((ColorDrawable) mBGDrawable).setColor(color); 9277 } else { 9278 setBackgroundDrawable(new ColorDrawable(color)); 9279 } 9280 } 9281 9282 /** 9283 * Set the background to a given resource. The resource should refer to 9284 * a Drawable object or 0 to remove the background. 9285 * @param resid The identifier of the resource. 9286 * @attr ref android.R.styleable#View_background 9287 */ 9288 @RemotableViewMethod 9289 public void setBackgroundResource(int resid) { 9290 if (resid != 0 && resid == mBackgroundResource) { 9291 return; 9292 } 9293 9294 Drawable d= null; 9295 if (resid != 0) { 9296 d = mResources.getDrawable(resid); 9297 } 9298 setBackgroundDrawable(d); 9299 9300 mBackgroundResource = resid; 9301 } 9302 9303 /** 9304 * Set the background to a given Drawable, or remove the background. If the 9305 * background has padding, this View's padding is set to the background's 9306 * padding. However, when a background is removed, this View's padding isn't 9307 * touched. If setting the padding is desired, please use 9308 * {@link #setPadding(int, int, int, int)}. 9309 * 9310 * @param d The Drawable to use as the background, or null to remove the 9311 * background 9312 */ 9313 public void setBackgroundDrawable(Drawable d) { 9314 boolean requestLayout = false; 9315 9316 mBackgroundResource = 0; 9317 9318 /* 9319 * Regardless of whether we're setting a new background or not, we want 9320 * to clear the previous drawable. 9321 */ 9322 if (mBGDrawable != null) { 9323 mBGDrawable.setCallback(null); 9324 unscheduleDrawable(mBGDrawable); 9325 } 9326 9327 if (d != null) { 9328 Rect padding = sThreadLocal.get(); 9329 if (padding == null) { 9330 padding = new Rect(); 9331 sThreadLocal.set(padding); 9332 } 9333 if (d.getPadding(padding)) { 9334 setPadding(padding.left, padding.top, padding.right, padding.bottom); 9335 } 9336 9337 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 9338 // if it has a different minimum size, we should layout again 9339 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 9340 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 9341 requestLayout = true; 9342 } 9343 9344 d.setCallback(this); 9345 if (d.isStateful()) { 9346 d.setState(getDrawableState()); 9347 } 9348 d.setVisible(getVisibility() == VISIBLE, false); 9349 mBGDrawable = d; 9350 9351 if ((mPrivateFlags & SKIP_DRAW) != 0) { 9352 mPrivateFlags &= ~SKIP_DRAW; 9353 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 9354 requestLayout = true; 9355 } 9356 } else { 9357 /* Remove the background */ 9358 mBGDrawable = null; 9359 9360 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 9361 /* 9362 * This view ONLY drew the background before and we're removing 9363 * the background, so now it won't draw anything 9364 * (hence we SKIP_DRAW) 9365 */ 9366 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 9367 mPrivateFlags |= SKIP_DRAW; 9368 } 9369 9370 /* 9371 * When the background is set, we try to apply its padding to this 9372 * View. When the background is removed, we don't touch this View's 9373 * padding. This is noted in the Javadocs. Hence, we don't need to 9374 * requestLayout(), the invalidate() below is sufficient. 9375 */ 9376 9377 // The old background's minimum size could have affected this 9378 // View's layout, so let's requestLayout 9379 requestLayout = true; 9380 } 9381 9382 computeOpaqueFlags(); 9383 9384 if (requestLayout) { 9385 requestLayout(); 9386 } 9387 9388 mBackgroundSizeChanged = true; 9389 invalidate(); 9390 } 9391 9392 /** 9393 * Gets the background drawable 9394 * @return The drawable used as the background for this view, if any. 9395 */ 9396 public Drawable getBackground() { 9397 return mBGDrawable; 9398 } 9399 9400 /** 9401 * Sets the padding. The view may add on the space required to display 9402 * the scrollbars, depending on the style and visibility of the scrollbars. 9403 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 9404 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 9405 * from the values set in this call. 9406 * 9407 * @attr ref android.R.styleable#View_padding 9408 * @attr ref android.R.styleable#View_paddingBottom 9409 * @attr ref android.R.styleable#View_paddingLeft 9410 * @attr ref android.R.styleable#View_paddingRight 9411 * @attr ref android.R.styleable#View_paddingTop 9412 * @param left the left padding in pixels 9413 * @param top the top padding in pixels 9414 * @param right the right padding in pixels 9415 * @param bottom the bottom padding in pixels 9416 */ 9417 public void setPadding(int left, int top, int right, int bottom) { 9418 boolean changed = false; 9419 9420 mUserPaddingLeft = left; 9421 mUserPaddingRight = right; 9422 mUserPaddingBottom = bottom; 9423 9424 final int viewFlags = mViewFlags; 9425 9426 // Common case is there are no scroll bars. 9427 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 9428 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 9429 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 9430 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 9431 ? 0 : getVerticalScrollbarWidth(); 9432 switch (mVerticalScrollbarPosition) { 9433 case SCROLLBAR_POSITION_DEFAULT: 9434 case SCROLLBAR_POSITION_RIGHT: 9435 right += offset; 9436 break; 9437 case SCROLLBAR_POSITION_LEFT: 9438 left += offset; 9439 break; 9440 } 9441 } 9442 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 9443 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 9444 ? 0 : getHorizontalScrollbarHeight(); 9445 } 9446 } 9447 9448 if (mPaddingLeft != left) { 9449 changed = true; 9450 mPaddingLeft = left; 9451 } 9452 if (mPaddingTop != top) { 9453 changed = true; 9454 mPaddingTop = top; 9455 } 9456 if (mPaddingRight != right) { 9457 changed = true; 9458 mPaddingRight = right; 9459 } 9460 if (mPaddingBottom != bottom) { 9461 changed = true; 9462 mPaddingBottom = bottom; 9463 } 9464 9465 if (changed) { 9466 requestLayout(); 9467 } 9468 } 9469 9470 /** 9471 * Returns the top padding of this view. 9472 * 9473 * @return the top padding in pixels 9474 */ 9475 public int getPaddingTop() { 9476 return mPaddingTop; 9477 } 9478 9479 /** 9480 * Returns the bottom padding of this view. If there are inset and enabled 9481 * scrollbars, this value may include the space required to display the 9482 * scrollbars as well. 9483 * 9484 * @return the bottom padding in pixels 9485 */ 9486 public int getPaddingBottom() { 9487 return mPaddingBottom; 9488 } 9489 9490 /** 9491 * Returns the left padding of this view. If there are inset and enabled 9492 * scrollbars, this value may include the space required to display the 9493 * scrollbars as well. 9494 * 9495 * @return the left padding in pixels 9496 */ 9497 public int getPaddingLeft() { 9498 return mPaddingLeft; 9499 } 9500 9501 /** 9502 * Returns the right padding of this view. If there are inset and enabled 9503 * scrollbars, this value may include the space required to display the 9504 * scrollbars as well. 9505 * 9506 * @return the right padding in pixels 9507 */ 9508 public int getPaddingRight() { 9509 return mPaddingRight; 9510 } 9511 9512 /** 9513 * Changes the selection state of this view. A view can be selected or not. 9514 * Note that selection is not the same as focus. Views are typically 9515 * selected in the context of an AdapterView like ListView or GridView; 9516 * the selected view is the view that is highlighted. 9517 * 9518 * @param selected true if the view must be selected, false otherwise 9519 */ 9520 public void setSelected(boolean selected) { 9521 if (((mPrivateFlags & SELECTED) != 0) != selected) { 9522 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 9523 if (!selected) resetPressedState(); 9524 invalidate(); 9525 refreshDrawableState(); 9526 dispatchSetSelected(selected); 9527 } 9528 } 9529 9530 /** 9531 * Dispatch setSelected to all of this View's children. 9532 * 9533 * @see #setSelected(boolean) 9534 * 9535 * @param selected The new selected state 9536 */ 9537 protected void dispatchSetSelected(boolean selected) { 9538 } 9539 9540 /** 9541 * Indicates the selection state of this view. 9542 * 9543 * @return true if the view is selected, false otherwise 9544 */ 9545 @ViewDebug.ExportedProperty 9546 public boolean isSelected() { 9547 return (mPrivateFlags & SELECTED) != 0; 9548 } 9549 9550 /** 9551 * Changes the activated state of this view. A view can be activated or not. 9552 * Note that activation is not the same as selection. Selection is 9553 * a transient property, representing the view (hierarchy) the user is 9554 * currently interacting with. Activation is a longer-term state that the 9555 * user can move views in and out of. For example, in a list view with 9556 * single or multiple selection enabled, the views in the current selection 9557 * set are activated. (Um, yeah, we are deeply sorry about the terminology 9558 * here.) The activated state is propagated down to children of the view it 9559 * is set on. 9560 * 9561 * @param activated true if the view must be activated, false otherwise 9562 */ 9563 public void setActivated(boolean activated) { 9564 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 9565 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 9566 invalidate(); 9567 refreshDrawableState(); 9568 dispatchSetActivated(activated); 9569 } 9570 } 9571 9572 /** 9573 * Dispatch setActivated to all of this View's children. 9574 * 9575 * @see #setActivated(boolean) 9576 * 9577 * @param activated The new activated state 9578 */ 9579 protected void dispatchSetActivated(boolean activated) { 9580 } 9581 9582 /** 9583 * Indicates the activation state of this view. 9584 * 9585 * @return true if the view is activated, false otherwise 9586 */ 9587 @ViewDebug.ExportedProperty 9588 public boolean isActivated() { 9589 return (mPrivateFlags & ACTIVATED) != 0; 9590 } 9591 9592 /** 9593 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 9594 * observer can be used to get notifications when global events, like 9595 * layout, happen. 9596 * 9597 * The returned ViewTreeObserver observer is not guaranteed to remain 9598 * valid for the lifetime of this View. If the caller of this method keeps 9599 * a long-lived reference to ViewTreeObserver, it should always check for 9600 * the return value of {@link ViewTreeObserver#isAlive()}. 9601 * 9602 * @return The ViewTreeObserver for this view's hierarchy. 9603 */ 9604 public ViewTreeObserver getViewTreeObserver() { 9605 if (mAttachInfo != null) { 9606 return mAttachInfo.mTreeObserver; 9607 } 9608 if (mFloatingTreeObserver == null) { 9609 mFloatingTreeObserver = new ViewTreeObserver(); 9610 } 9611 return mFloatingTreeObserver; 9612 } 9613 9614 /** 9615 * <p>Finds the topmost view in the current view hierarchy.</p> 9616 * 9617 * @return the topmost view containing this view 9618 */ 9619 public View getRootView() { 9620 if (mAttachInfo != null) { 9621 final View v = mAttachInfo.mRootView; 9622 if (v != null) { 9623 return v; 9624 } 9625 } 9626 9627 View parent = this; 9628 9629 while (parent.mParent != null && parent.mParent instanceof View) { 9630 parent = (View) parent.mParent; 9631 } 9632 9633 return parent; 9634 } 9635 9636 /** 9637 * <p>Computes the coordinates of this view on the screen. The argument 9638 * must be an array of two integers. After the method returns, the array 9639 * contains the x and y location in that order.</p> 9640 * 9641 * @param location an array of two integers in which to hold the coordinates 9642 */ 9643 public void getLocationOnScreen(int[] location) { 9644 getLocationInWindow(location); 9645 9646 final AttachInfo info = mAttachInfo; 9647 if (info != null) { 9648 location[0] += info.mWindowLeft; 9649 location[1] += info.mWindowTop; 9650 } 9651 } 9652 9653 /** 9654 * <p>Computes the coordinates of this view in its window. The argument 9655 * must be an array of two integers. After the method returns, the array 9656 * contains the x and y location in that order.</p> 9657 * 9658 * @param location an array of two integers in which to hold the coordinates 9659 */ 9660 public void getLocationInWindow(int[] location) { 9661 if (location == null || location.length < 2) { 9662 throw new IllegalArgumentException("location must be an array of " 9663 + "two integers"); 9664 } 9665 9666 location[0] = mLeft + (int) (mTranslationX + 0.5f); 9667 location[1] = mTop + (int) (mTranslationY + 0.5f); 9668 9669 ViewParent viewParent = mParent; 9670 while (viewParent instanceof View) { 9671 final View view = (View)viewParent; 9672 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 9673 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 9674 viewParent = view.mParent; 9675 } 9676 9677 if (viewParent instanceof ViewRoot) { 9678 // *cough* 9679 final ViewRoot vr = (ViewRoot)viewParent; 9680 location[1] -= vr.mCurScrollY; 9681 } 9682 } 9683 9684 /** 9685 * {@hide} 9686 * @param id the id of the view to be found 9687 * @return the view of the specified id, null if cannot be found 9688 */ 9689 protected View findViewTraversal(int id) { 9690 if (id == mID) { 9691 return this; 9692 } 9693 return null; 9694 } 9695 9696 /** 9697 * {@hide} 9698 * @param tag the tag of the view to be found 9699 * @return the view of specified tag, null if cannot be found 9700 */ 9701 protected View findViewWithTagTraversal(Object tag) { 9702 if (tag != null && tag.equals(mTag)) { 9703 return this; 9704 } 9705 return null; 9706 } 9707 9708 /** 9709 * {@hide} 9710 * @param predicate The predicate to evaluate. 9711 * @return The first view that matches the predicate or null. 9712 */ 9713 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 9714 if (predicate.apply(this)) { 9715 return this; 9716 } 9717 return null; 9718 } 9719 9720 /** 9721 * Look for a child view with the given id. If this view has the given 9722 * id, return this view. 9723 * 9724 * @param id The id to search for. 9725 * @return The view that has the given id in the hierarchy or null 9726 */ 9727 public final View findViewById(int id) { 9728 if (id < 0) { 9729 return null; 9730 } 9731 return findViewTraversal(id); 9732 } 9733 9734 /** 9735 * Look for a child view with the given tag. If this view has the given 9736 * tag, return this view. 9737 * 9738 * @param tag The tag to search for, using "tag.equals(getTag())". 9739 * @return The View that has the given tag in the hierarchy or null 9740 */ 9741 public final View findViewWithTag(Object tag) { 9742 if (tag == null) { 9743 return null; 9744 } 9745 return findViewWithTagTraversal(tag); 9746 } 9747 9748 /** 9749 * {@hide} 9750 * Look for a child view that matches the specified predicate. 9751 * If this view matches the predicate, return this view. 9752 * 9753 * @param predicate The predicate to evaluate. 9754 * @return The first view that matches the predicate or null. 9755 */ 9756 public final View findViewByPredicate(Predicate<View> predicate) { 9757 return findViewByPredicateTraversal(predicate); 9758 } 9759 9760 /** 9761 * Sets the identifier for this view. The identifier does not have to be 9762 * unique in this view's hierarchy. The identifier should be a positive 9763 * number. 9764 * 9765 * @see #NO_ID 9766 * @see #getId 9767 * @see #findViewById 9768 * 9769 * @param id a number used to identify the view 9770 * 9771 * @attr ref android.R.styleable#View_id 9772 */ 9773 public void setId(int id) { 9774 mID = id; 9775 } 9776 9777 /** 9778 * {@hide} 9779 * 9780 * @param isRoot true if the view belongs to the root namespace, false 9781 * otherwise 9782 */ 9783 public void setIsRootNamespace(boolean isRoot) { 9784 if (isRoot) { 9785 mPrivateFlags |= IS_ROOT_NAMESPACE; 9786 } else { 9787 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 9788 } 9789 } 9790 9791 /** 9792 * {@hide} 9793 * 9794 * @return true if the view belongs to the root namespace, false otherwise 9795 */ 9796 public boolean isRootNamespace() { 9797 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 9798 } 9799 9800 /** 9801 * Returns this view's identifier. 9802 * 9803 * @return a positive integer used to identify the view or {@link #NO_ID} 9804 * if the view has no ID 9805 * 9806 * @see #setId 9807 * @see #findViewById 9808 * @attr ref android.R.styleable#View_id 9809 */ 9810 @ViewDebug.CapturedViewProperty 9811 public int getId() { 9812 return mID; 9813 } 9814 9815 /** 9816 * Returns this view's tag. 9817 * 9818 * @return the Object stored in this view as a tag 9819 * 9820 * @see #setTag(Object) 9821 * @see #getTag(int) 9822 */ 9823 @ViewDebug.ExportedProperty 9824 public Object getTag() { 9825 return mTag; 9826 } 9827 9828 /** 9829 * Sets the tag associated with this view. A tag can be used to mark 9830 * a view in its hierarchy and does not have to be unique within the 9831 * hierarchy. Tags can also be used to store data within a view without 9832 * resorting to another data structure. 9833 * 9834 * @param tag an Object to tag the view with 9835 * 9836 * @see #getTag() 9837 * @see #setTag(int, Object) 9838 */ 9839 public void setTag(final Object tag) { 9840 mTag = tag; 9841 } 9842 9843 /** 9844 * Returns the tag associated with this view and the specified key. 9845 * 9846 * @param key The key identifying the tag 9847 * 9848 * @return the Object stored in this view as a tag 9849 * 9850 * @see #setTag(int, Object) 9851 * @see #getTag() 9852 */ 9853 public Object getTag(int key) { 9854 SparseArray<Object> tags = null; 9855 synchronized (sTagsLock) { 9856 if (sTags != null) { 9857 tags = sTags.get(this); 9858 } 9859 } 9860 9861 if (tags != null) return tags.get(key); 9862 return null; 9863 } 9864 9865 /** 9866 * Sets a tag associated with this view and a key. A tag can be used 9867 * to mark a view in its hierarchy and does not have to be unique within 9868 * the hierarchy. Tags can also be used to store data within a view 9869 * without resorting to another data structure. 9870 * 9871 * The specified key should be an id declared in the resources of the 9872 * application to ensure it is unique (see the <a 9873 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 9874 * Keys identified as belonging to 9875 * the Android framework or not associated with any package will cause 9876 * an {@link IllegalArgumentException} to be thrown. 9877 * 9878 * @param key The key identifying the tag 9879 * @param tag An Object to tag the view with 9880 * 9881 * @throws IllegalArgumentException If they specified key is not valid 9882 * 9883 * @see #setTag(Object) 9884 * @see #getTag(int) 9885 */ 9886 public void setTag(int key, final Object tag) { 9887 // If the package id is 0x00 or 0x01, it's either an undefined package 9888 // or a framework id 9889 if ((key >>> 24) < 2) { 9890 throw new IllegalArgumentException("The key must be an application-specific " 9891 + "resource id."); 9892 } 9893 9894 setTagInternal(this, key, tag); 9895 } 9896 9897 /** 9898 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 9899 * framework id. 9900 * 9901 * @hide 9902 */ 9903 public void setTagInternal(int key, Object tag) { 9904 if ((key >>> 24) != 0x1) { 9905 throw new IllegalArgumentException("The key must be a framework-specific " 9906 + "resource id."); 9907 } 9908 9909 setTagInternal(this, key, tag); 9910 } 9911 9912 private static void setTagInternal(View view, int key, Object tag) { 9913 SparseArray<Object> tags = null; 9914 synchronized (sTagsLock) { 9915 if (sTags == null) { 9916 sTags = new WeakHashMap<View, SparseArray<Object>>(); 9917 } else { 9918 tags = sTags.get(view); 9919 } 9920 } 9921 9922 if (tags == null) { 9923 tags = new SparseArray<Object>(2); 9924 synchronized (sTagsLock) { 9925 sTags.put(view, tags); 9926 } 9927 } 9928 9929 tags.put(key, tag); 9930 } 9931 9932 /** 9933 * @param consistency The type of consistency. See ViewDebug for more information. 9934 * 9935 * @hide 9936 */ 9937 protected boolean dispatchConsistencyCheck(int consistency) { 9938 return onConsistencyCheck(consistency); 9939 } 9940 9941 /** 9942 * Method that subclasses should implement to check their consistency. The type of 9943 * consistency check is indicated by the bit field passed as a parameter. 9944 * 9945 * @param consistency The type of consistency. See ViewDebug for more information. 9946 * 9947 * @throws IllegalStateException if the view is in an inconsistent state. 9948 * 9949 * @hide 9950 */ 9951 protected boolean onConsistencyCheck(int consistency) { 9952 boolean result = true; 9953 9954 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 9955 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 9956 9957 if (checkLayout) { 9958 if (getParent() == null) { 9959 result = false; 9960 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9961 "View " + this + " does not have a parent."); 9962 } 9963 9964 if (mAttachInfo == null) { 9965 result = false; 9966 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9967 "View " + this + " is not attached to a window."); 9968 } 9969 } 9970 9971 if (checkDrawing) { 9972 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 9973 // from their draw() method 9974 9975 if ((mPrivateFlags & DRAWN) != DRAWN && 9976 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 9977 result = false; 9978 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9979 "View " + this + " was invalidated but its drawing cache is valid."); 9980 } 9981 } 9982 9983 return result; 9984 } 9985 9986 /** 9987 * Prints information about this view in the log output, with the tag 9988 * {@link #VIEW_LOG_TAG}. 9989 * 9990 * @hide 9991 */ 9992 public void debug() { 9993 debug(0); 9994 } 9995 9996 /** 9997 * Prints information about this view in the log output, with the tag 9998 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 9999 * indentation defined by the <code>depth</code>. 10000 * 10001 * @param depth the indentation level 10002 * 10003 * @hide 10004 */ 10005 protected void debug(int depth) { 10006 String output = debugIndent(depth - 1); 10007 10008 output += "+ " + this; 10009 int id = getId(); 10010 if (id != -1) { 10011 output += " (id=" + id + ")"; 10012 } 10013 Object tag = getTag(); 10014 if (tag != null) { 10015 output += " (tag=" + tag + ")"; 10016 } 10017 Log.d(VIEW_LOG_TAG, output); 10018 10019 if ((mPrivateFlags & FOCUSED) != 0) { 10020 output = debugIndent(depth) + " FOCUSED"; 10021 Log.d(VIEW_LOG_TAG, output); 10022 } 10023 10024 output = debugIndent(depth); 10025 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 10026 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 10027 + "} "; 10028 Log.d(VIEW_LOG_TAG, output); 10029 10030 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 10031 || mPaddingBottom != 0) { 10032 output = debugIndent(depth); 10033 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 10034 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 10035 Log.d(VIEW_LOG_TAG, output); 10036 } 10037 10038 output = debugIndent(depth); 10039 output += "mMeasureWidth=" + mMeasuredWidth + 10040 " mMeasureHeight=" + mMeasuredHeight; 10041 Log.d(VIEW_LOG_TAG, output); 10042 10043 output = debugIndent(depth); 10044 if (mLayoutParams == null) { 10045 output += "BAD! no layout params"; 10046 } else { 10047 output = mLayoutParams.debug(output); 10048 } 10049 Log.d(VIEW_LOG_TAG, output); 10050 10051 output = debugIndent(depth); 10052 output += "flags={"; 10053 output += View.printFlags(mViewFlags); 10054 output += "}"; 10055 Log.d(VIEW_LOG_TAG, output); 10056 10057 output = debugIndent(depth); 10058 output += "privateFlags={"; 10059 output += View.printPrivateFlags(mPrivateFlags); 10060 output += "}"; 10061 Log.d(VIEW_LOG_TAG, output); 10062 } 10063 10064 /** 10065 * Creates an string of whitespaces used for indentation. 10066 * 10067 * @param depth the indentation level 10068 * @return a String containing (depth * 2 + 3) * 2 white spaces 10069 * 10070 * @hide 10071 */ 10072 protected static String debugIndent(int depth) { 10073 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 10074 for (int i = 0; i < (depth * 2) + 3; i++) { 10075 spaces.append(' ').append(' '); 10076 } 10077 return spaces.toString(); 10078 } 10079 10080 /** 10081 * <p>Return the offset of the widget's text baseline from the widget's top 10082 * boundary. If this widget does not support baseline alignment, this 10083 * method returns -1. </p> 10084 * 10085 * @return the offset of the baseline within the widget's bounds or -1 10086 * if baseline alignment is not supported 10087 */ 10088 @ViewDebug.ExportedProperty(category = "layout") 10089 public int getBaseline() { 10090 return -1; 10091 } 10092 10093 /** 10094 * Call this when something has changed which has invalidated the 10095 * layout of this view. This will schedule a layout pass of the view 10096 * tree. 10097 */ 10098 public void requestLayout() { 10099 if (ViewDebug.TRACE_HIERARCHY) { 10100 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 10101 } 10102 10103 mPrivateFlags |= FORCE_LAYOUT; 10104 10105 if (mParent != null && !mParent.isLayoutRequested()) { 10106 mParent.requestLayout(); 10107 } 10108 } 10109 10110 /** 10111 * Forces this view to be laid out during the next layout pass. 10112 * This method does not call requestLayout() or forceLayout() 10113 * on the parent. 10114 */ 10115 public void forceLayout() { 10116 mPrivateFlags |= FORCE_LAYOUT; 10117 } 10118 10119 /** 10120 * <p> 10121 * This is called to find out how big a view should be. The parent 10122 * supplies constraint information in the width and height parameters. 10123 * </p> 10124 * 10125 * <p> 10126 * The actual mesurement work of a view is performed in 10127 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 10128 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 10129 * </p> 10130 * 10131 * 10132 * @param widthMeasureSpec Horizontal space requirements as imposed by the 10133 * parent 10134 * @param heightMeasureSpec Vertical space requirements as imposed by the 10135 * parent 10136 * 10137 * @see #onMeasure(int, int) 10138 */ 10139 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 10140 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 10141 widthMeasureSpec != mOldWidthMeasureSpec || 10142 heightMeasureSpec != mOldHeightMeasureSpec) { 10143 10144 // first clears the measured dimension flag 10145 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 10146 10147 if (ViewDebug.TRACE_HIERARCHY) { 10148 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 10149 } 10150 10151 // measure ourselves, this should set the measured dimension flag back 10152 onMeasure(widthMeasureSpec, heightMeasureSpec); 10153 10154 // flag not set, setMeasuredDimension() was not invoked, we raise 10155 // an exception to warn the developer 10156 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 10157 throw new IllegalStateException("onMeasure() did not set the" 10158 + " measured dimension by calling" 10159 + " setMeasuredDimension()"); 10160 } 10161 10162 mPrivateFlags |= LAYOUT_REQUIRED; 10163 } 10164 10165 mOldWidthMeasureSpec = widthMeasureSpec; 10166 mOldHeightMeasureSpec = heightMeasureSpec; 10167 } 10168 10169 /** 10170 * <p> 10171 * Measure the view and its content to determine the measured width and the 10172 * measured height. This method is invoked by {@link #measure(int, int)} and 10173 * should be overriden by subclasses to provide accurate and efficient 10174 * measurement of their contents. 10175 * </p> 10176 * 10177 * <p> 10178 * <strong>CONTRACT:</strong> When overriding this method, you 10179 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 10180 * measured width and height of this view. Failure to do so will trigger an 10181 * <code>IllegalStateException</code>, thrown by 10182 * {@link #measure(int, int)}. Calling the superclass' 10183 * {@link #onMeasure(int, int)} is a valid use. 10184 * </p> 10185 * 10186 * <p> 10187 * The base class implementation of measure defaults to the background size, 10188 * unless a larger size is allowed by the MeasureSpec. Subclasses should 10189 * override {@link #onMeasure(int, int)} to provide better measurements of 10190 * their content. 10191 * </p> 10192 * 10193 * <p> 10194 * If this method is overridden, it is the subclass's responsibility to make 10195 * sure the measured height and width are at least the view's minimum height 10196 * and width ({@link #getSuggestedMinimumHeight()} and 10197 * {@link #getSuggestedMinimumWidth()}). 10198 * </p> 10199 * 10200 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 10201 * The requirements are encoded with 10202 * {@link android.view.View.MeasureSpec}. 10203 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 10204 * The requirements are encoded with 10205 * {@link android.view.View.MeasureSpec}. 10206 * 10207 * @see #getMeasuredWidth() 10208 * @see #getMeasuredHeight() 10209 * @see #setMeasuredDimension(int, int) 10210 * @see #getSuggestedMinimumHeight() 10211 * @see #getSuggestedMinimumWidth() 10212 * @see android.view.View.MeasureSpec#getMode(int) 10213 * @see android.view.View.MeasureSpec#getSize(int) 10214 */ 10215 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 10216 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 10217 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 10218 } 10219 10220 /** 10221 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 10222 * measured width and measured height. Failing to do so will trigger an 10223 * exception at measurement time.</p> 10224 * 10225 * @param measuredWidth The measured width of this view. May be a complex 10226 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10227 * {@link #MEASURED_STATE_TOO_SMALL}. 10228 * @param measuredHeight The measured height of this view. May be a complex 10229 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10230 * {@link #MEASURED_STATE_TOO_SMALL}. 10231 */ 10232 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 10233 mMeasuredWidth = measuredWidth; 10234 mMeasuredHeight = measuredHeight; 10235 10236 mPrivateFlags |= MEASURED_DIMENSION_SET; 10237 } 10238 10239 /** 10240 * Merge two states as returned by {@link #getMeasuredState()}. 10241 * @param curState The current state as returned from a view or the result 10242 * of combining multiple views. 10243 * @param newState The new view state to combine. 10244 * @return Returns a new integer reflecting the combination of the two 10245 * states. 10246 */ 10247 public static int combineMeasuredStates(int curState, int newState) { 10248 return curState | newState; 10249 } 10250 10251 /** 10252 * Version of {@link #resolveSizeAndState(int, int, int)} 10253 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 10254 */ 10255 public static int resolveSize(int size, int measureSpec) { 10256 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 10257 } 10258 10259 /** 10260 * Utility to reconcile a desired size and state, with constraints imposed 10261 * by a MeasureSpec. Will take the desired size, unless a different size 10262 * is imposed by the constraints. The returned value is a compound integer, 10263 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 10264 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 10265 * size is smaller than the size the view wants to be. 10266 * 10267 * @param size How big the view wants to be 10268 * @param measureSpec Constraints imposed by the parent 10269 * @return Size information bit mask as defined by 10270 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 10271 */ 10272 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 10273 int result = size; 10274 int specMode = MeasureSpec.getMode(measureSpec); 10275 int specSize = MeasureSpec.getSize(measureSpec); 10276 switch (specMode) { 10277 case MeasureSpec.UNSPECIFIED: 10278 result = size; 10279 break; 10280 case MeasureSpec.AT_MOST: 10281 if (specSize < size) { 10282 result = specSize | MEASURED_STATE_TOO_SMALL; 10283 } else { 10284 result = size; 10285 } 10286 break; 10287 case MeasureSpec.EXACTLY: 10288 result = specSize; 10289 break; 10290 } 10291 return result | (childMeasuredState&MEASURED_STATE_MASK); 10292 } 10293 10294 /** 10295 * Utility to return a default size. Uses the supplied size if the 10296 * MeasureSpec imposed no contraints. Will get larger if allowed 10297 * by the MeasureSpec. 10298 * 10299 * @param size Default size for this view 10300 * @param measureSpec Constraints imposed by the parent 10301 * @return The size this view should be. 10302 */ 10303 public static int getDefaultSize(int size, int measureSpec) { 10304 int result = size; 10305 int specMode = MeasureSpec.getMode(measureSpec); 10306 int specSize = MeasureSpec.getSize(measureSpec); 10307 10308 switch (specMode) { 10309 case MeasureSpec.UNSPECIFIED: 10310 result = size; 10311 break; 10312 case MeasureSpec.AT_MOST: 10313 case MeasureSpec.EXACTLY: 10314 result = specSize; 10315 break; 10316 } 10317 return result; 10318 } 10319 10320 /** 10321 * Returns the suggested minimum height that the view should use. This 10322 * returns the maximum of the view's minimum height 10323 * and the background's minimum height 10324 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 10325 * <p> 10326 * When being used in {@link #onMeasure(int, int)}, the caller should still 10327 * ensure the returned height is within the requirements of the parent. 10328 * 10329 * @return The suggested minimum height of the view. 10330 */ 10331 protected int getSuggestedMinimumHeight() { 10332 int suggestedMinHeight = mMinHeight; 10333 10334 if (mBGDrawable != null) { 10335 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 10336 if (suggestedMinHeight < bgMinHeight) { 10337 suggestedMinHeight = bgMinHeight; 10338 } 10339 } 10340 10341 return suggestedMinHeight; 10342 } 10343 10344 /** 10345 * Returns the suggested minimum width that the view should use. This 10346 * returns the maximum of the view's minimum width) 10347 * and the background's minimum width 10348 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 10349 * <p> 10350 * When being used in {@link #onMeasure(int, int)}, the caller should still 10351 * ensure the returned width is within the requirements of the parent. 10352 * 10353 * @return The suggested minimum width of the view. 10354 */ 10355 protected int getSuggestedMinimumWidth() { 10356 int suggestedMinWidth = mMinWidth; 10357 10358 if (mBGDrawable != null) { 10359 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 10360 if (suggestedMinWidth < bgMinWidth) { 10361 suggestedMinWidth = bgMinWidth; 10362 } 10363 } 10364 10365 return suggestedMinWidth; 10366 } 10367 10368 /** 10369 * Sets the minimum height of the view. It is not guaranteed the view will 10370 * be able to achieve this minimum height (for example, if its parent layout 10371 * constrains it with less available height). 10372 * 10373 * @param minHeight The minimum height the view will try to be. 10374 */ 10375 public void setMinimumHeight(int minHeight) { 10376 mMinHeight = minHeight; 10377 } 10378 10379 /** 10380 * Sets the minimum width of the view. It is not guaranteed the view will 10381 * be able to achieve this minimum width (for example, if its parent layout 10382 * constrains it with less available width). 10383 * 10384 * @param minWidth The minimum width the view will try to be. 10385 */ 10386 public void setMinimumWidth(int minWidth) { 10387 mMinWidth = minWidth; 10388 } 10389 10390 /** 10391 * Get the animation currently associated with this view. 10392 * 10393 * @return The animation that is currently playing or 10394 * scheduled to play for this view. 10395 */ 10396 public Animation getAnimation() { 10397 return mCurrentAnimation; 10398 } 10399 10400 /** 10401 * Start the specified animation now. 10402 * 10403 * @param animation the animation to start now 10404 */ 10405 public void startAnimation(Animation animation) { 10406 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 10407 setAnimation(animation); 10408 invalidate(); 10409 } 10410 10411 /** 10412 * Cancels any animations for this view. 10413 */ 10414 public void clearAnimation() { 10415 if (mCurrentAnimation != null) { 10416 mCurrentAnimation.detach(); 10417 } 10418 mCurrentAnimation = null; 10419 } 10420 10421 /** 10422 * Sets the next animation to play for this view. 10423 * If you want the animation to play immediately, use 10424 * startAnimation. This method provides allows fine-grained 10425 * control over the start time and invalidation, but you 10426 * must make sure that 1) the animation has a start time set, and 10427 * 2) the view will be invalidated when the animation is supposed to 10428 * start. 10429 * 10430 * @param animation The next animation, or null. 10431 */ 10432 public void setAnimation(Animation animation) { 10433 mCurrentAnimation = animation; 10434 if (animation != null) { 10435 animation.reset(); 10436 } 10437 } 10438 10439 /** 10440 * Invoked by a parent ViewGroup to notify the start of the animation 10441 * currently associated with this view. If you override this method, 10442 * always call super.onAnimationStart(); 10443 * 10444 * @see #setAnimation(android.view.animation.Animation) 10445 * @see #getAnimation() 10446 */ 10447 protected void onAnimationStart() { 10448 mPrivateFlags |= ANIMATION_STARTED; 10449 } 10450 10451 /** 10452 * Invoked by a parent ViewGroup to notify the end of the animation 10453 * currently associated with this view. If you override this method, 10454 * always call super.onAnimationEnd(); 10455 * 10456 * @see #setAnimation(android.view.animation.Animation) 10457 * @see #getAnimation() 10458 */ 10459 protected void onAnimationEnd() { 10460 mPrivateFlags &= ~ANIMATION_STARTED; 10461 } 10462 10463 /** 10464 * Invoked if there is a Transform that involves alpha. Subclass that can 10465 * draw themselves with the specified alpha should return true, and then 10466 * respect that alpha when their onDraw() is called. If this returns false 10467 * then the view may be redirected to draw into an offscreen buffer to 10468 * fulfill the request, which will look fine, but may be slower than if the 10469 * subclass handles it internally. The default implementation returns false. 10470 * 10471 * @param alpha The alpha (0..255) to apply to the view's drawing 10472 * @return true if the view can draw with the specified alpha. 10473 */ 10474 protected boolean onSetAlpha(int alpha) { 10475 return false; 10476 } 10477 10478 /** 10479 * This is used by the RootView to perform an optimization when 10480 * the view hierarchy contains one or several SurfaceView. 10481 * SurfaceView is always considered transparent, but its children are not, 10482 * therefore all View objects remove themselves from the global transparent 10483 * region (passed as a parameter to this function). 10484 * 10485 * @param region The transparent region for this ViewRoot (window). 10486 * 10487 * @return Returns true if the effective visibility of the view at this 10488 * point is opaque, regardless of the transparent region; returns false 10489 * if it is possible for underlying windows to be seen behind the view. 10490 * 10491 * {@hide} 10492 */ 10493 public boolean gatherTransparentRegion(Region region) { 10494 final AttachInfo attachInfo = mAttachInfo; 10495 if (region != null && attachInfo != null) { 10496 final int pflags = mPrivateFlags; 10497 if ((pflags & SKIP_DRAW) == 0) { 10498 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 10499 // remove it from the transparent region. 10500 final int[] location = attachInfo.mTransparentLocation; 10501 getLocationInWindow(location); 10502 region.op(location[0], location[1], location[0] + mRight - mLeft, 10503 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 10504 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 10505 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 10506 // exists, so we remove the background drawable's non-transparent 10507 // parts from this transparent region. 10508 applyDrawableToTransparentRegion(mBGDrawable, region); 10509 } 10510 } 10511 return true; 10512 } 10513 10514 /** 10515 * Play a sound effect for this view. 10516 * 10517 * <p>The framework will play sound effects for some built in actions, such as 10518 * clicking, but you may wish to play these effects in your widget, 10519 * for instance, for internal navigation. 10520 * 10521 * <p>The sound effect will only be played if sound effects are enabled by the user, and 10522 * {@link #isSoundEffectsEnabled()} is true. 10523 * 10524 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 10525 */ 10526 public void playSoundEffect(int soundConstant) { 10527 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 10528 return; 10529 } 10530 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 10531 } 10532 10533 /** 10534 * BZZZTT!!1! 10535 * 10536 * <p>Provide haptic feedback to the user for this view. 10537 * 10538 * <p>The framework will provide haptic feedback for some built in actions, 10539 * such as long presses, but you may wish to provide feedback for your 10540 * own widget. 10541 * 10542 * <p>The feedback will only be performed if 10543 * {@link #isHapticFeedbackEnabled()} is true. 10544 * 10545 * @param feedbackConstant One of the constants defined in 10546 * {@link HapticFeedbackConstants} 10547 */ 10548 public boolean performHapticFeedback(int feedbackConstant) { 10549 return performHapticFeedback(feedbackConstant, 0); 10550 } 10551 10552 /** 10553 * BZZZTT!!1! 10554 * 10555 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 10556 * 10557 * @param feedbackConstant One of the constants defined in 10558 * {@link HapticFeedbackConstants} 10559 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 10560 */ 10561 public boolean performHapticFeedback(int feedbackConstant, int flags) { 10562 if (mAttachInfo == null) { 10563 return false; 10564 } 10565 //noinspection SimplifiableIfStatement 10566 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 10567 && !isHapticFeedbackEnabled()) { 10568 return false; 10569 } 10570 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 10571 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 10572 } 10573 10574 /** 10575 * !!! TODO: real docs 10576 * 10577 * The base class implementation makes the shadow the same size and appearance 10578 * as the view itself, and positions it with its center at the touch point. 10579 */ 10580 public static class DragShadowBuilder { 10581 private final WeakReference<View> mView; 10582 10583 /** 10584 * Construct a shadow builder object for use with the given view. 10585 * @param view 10586 */ 10587 public DragShadowBuilder(View view) { 10588 mView = new WeakReference<View>(view); 10589 } 10590 10591 final public View getView() { 10592 return mView.get(); 10593 } 10594 10595 /** 10596 * Provide the draggable-shadow metrics for the operation: the dimensions of 10597 * the shadow image itself, and the point within that shadow that should 10598 * be centered under the touch location while dragging. 10599 * <p> 10600 * The default implementation sets the dimensions of the shadow to be the 10601 * same as the dimensions of the View itself and centers the shadow under 10602 * the touch point. 10603 * 10604 * @param shadowSize The application should set the {@code x} member of this 10605 * parameter to the desired shadow width, and the {@code y} member to 10606 * the desired height. 10607 * @param shadowTouchPoint The application should set this point to be the 10608 * location within the shadow that should track directly underneath 10609 * the touch point on the screen during a drag. 10610 */ 10611 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 10612 final View view = mView.get(); 10613 if (view != null) { 10614 shadowSize.set(view.getWidth(), view.getHeight()); 10615 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 10616 } else { 10617 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 10618 } 10619 } 10620 10621 /** 10622 * Draw the shadow image for the upcoming drag. The shadow canvas was 10623 * created with the dimensions supplied by the 10624 * {@link #onProvideShadowMetrics(Point, Point)} callback. 10625 * 10626 * @param canvas 10627 */ 10628 public void onDrawShadow(Canvas canvas) { 10629 final View view = mView.get(); 10630 if (view != null) { 10631 view.draw(canvas); 10632 } else { 10633 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 10634 } 10635 } 10636 } 10637 10638 /** 10639 * Drag and drop. App calls startDrag(), then callbacks to the shadow builder's 10640 * {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} and 10641 * {@link DragShadowBuilder#onDrawShadow(Canvas)} methods happen, then the drag 10642 * operation is handed over to the OS. 10643 * !!! TODO: real docs 10644 * 10645 * @param data !!! TODO 10646 * @param shadowBuilder !!! TODO 10647 * @param myLocalState An arbitrary object that will be passed as part of every DragEvent 10648 * delivered to the calling application during the course of the current drag operation. 10649 * This object is private to the application that called startDrag(), and is not 10650 * visible to other applications. It provides a lightweight way for the application to 10651 * propagate information from the initiator to the recipient of a drag within its own 10652 * application; for example, to help disambiguate between 'copy' and 'move' semantics. 10653 * @param flags Flags affecting the drag operation. At present no flags are defined; 10654 * pass 0 for this parameter. 10655 * @return {@code true} if the drag operation was initiated successfully; {@code false} if 10656 * an error prevented the drag from taking place. 10657 */ 10658 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 10659 Object myLocalState, int flags) { 10660 if (ViewDebug.DEBUG_DRAG) { 10661 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 10662 } 10663 boolean okay = false; 10664 10665 Point shadowSize = new Point(); 10666 Point shadowTouchPoint = new Point(); 10667 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 10668 10669 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 10670 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 10671 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 10672 } 10673 10674 if (ViewDebug.DEBUG_DRAG) { 10675 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 10676 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 10677 } 10678 Surface surface = new Surface(); 10679 try { 10680 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 10681 flags, shadowSize.x, shadowSize.y, surface); 10682 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 10683 + " surface=" + surface); 10684 if (token != null) { 10685 Canvas canvas = surface.lockCanvas(null); 10686 try { 10687 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 10688 shadowBuilder.onDrawShadow(canvas); 10689 } finally { 10690 surface.unlockCanvasAndPost(canvas); 10691 } 10692 10693 final ViewRoot root = getViewRoot(); 10694 10695 // Cache the local state object for delivery with DragEvents 10696 root.setLocalDragState(myLocalState); 10697 10698 // repurpose 'shadowSize' for the last touch point 10699 root.getLastTouchPoint(shadowSize); 10700 10701 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 10702 shadowSize.x, shadowSize.y, 10703 shadowTouchPoint.x, shadowTouchPoint.y, data); 10704 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 10705 } 10706 } catch (Exception e) { 10707 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 10708 surface.destroy(); 10709 } 10710 10711 return okay; 10712 } 10713 10714 /** 10715 * Drag-and-drop event dispatch. The event.getAction() verb is one of the DragEvent 10716 * constants DRAG_STARTED_EVENT, DRAG_EVENT, DROP_EVENT, and DRAG_ENDED_EVENT. 10717 * 10718 * For DRAG_STARTED_EVENT, event.getClipDescription() describes the content 10719 * being dragged. onDragEvent() should return 'true' if the view can handle 10720 * a drop of that content. A view that returns 'false' here will receive no 10721 * further calls to onDragEvent() about the drag/drop operation. 10722 * 10723 * For DRAG_ENTERED, event.getClipDescription() describes the content being 10724 * dragged. This will be the same content description passed in the 10725 * DRAG_STARTED_EVENT invocation. 10726 * 10727 * For DRAG_EXITED, event.getClipDescription() describes the content being 10728 * dragged. This will be the same content description passed in the 10729 * DRAG_STARTED_EVENT invocation. The view should return to its approriate 10730 * drag-acceptance visual state. 10731 * 10732 * For DRAG_LOCATION_EVENT, event.getX() and event.getY() give the location in View 10733 * coordinates of the current drag point. The view must return 'true' if it 10734 * can accept a drop of the current drag content, false otherwise. 10735 * 10736 * For DROP_EVENT, event.getX() and event.getY() give the location of the drop 10737 * within the view; also, event.getClipData() returns the full data payload 10738 * being dropped. The view should return 'true' if it consumed the dropped 10739 * content, 'false' if it did not. 10740 * 10741 * For DRAG_ENDED_EVENT, the 'event' argument may be null. The view should return 10742 * to its normal visual state. 10743 */ 10744 public boolean onDragEvent(DragEvent event) { 10745 return false; 10746 } 10747 10748 /** 10749 * Views typically don't need to override dispatchDragEvent(); it just calls 10750 * onDragEvent(event) and passes the result up appropriately. 10751 */ 10752 public boolean dispatchDragEvent(DragEvent event) { 10753 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 10754 && mOnDragListener.onDrag(this, event)) { 10755 return true; 10756 } 10757 return onDragEvent(event); 10758 } 10759 10760 /** 10761 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 10762 * it is ever exposed at all. 10763 * @hide 10764 */ 10765 public void onCloseSystemDialogs(String reason) { 10766 } 10767 10768 /** 10769 * Given a Drawable whose bounds have been set to draw into this view, 10770 * update a Region being computed for {@link #gatherTransparentRegion} so 10771 * that any non-transparent parts of the Drawable are removed from the 10772 * given transparent region. 10773 * 10774 * @param dr The Drawable whose transparency is to be applied to the region. 10775 * @param region A Region holding the current transparency information, 10776 * where any parts of the region that are set are considered to be 10777 * transparent. On return, this region will be modified to have the 10778 * transparency information reduced by the corresponding parts of the 10779 * Drawable that are not transparent. 10780 * {@hide} 10781 */ 10782 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 10783 if (DBG) { 10784 Log.i("View", "Getting transparent region for: " + this); 10785 } 10786 final Region r = dr.getTransparentRegion(); 10787 final Rect db = dr.getBounds(); 10788 final AttachInfo attachInfo = mAttachInfo; 10789 if (r != null && attachInfo != null) { 10790 final int w = getRight()-getLeft(); 10791 final int h = getBottom()-getTop(); 10792 if (db.left > 0) { 10793 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 10794 r.op(0, 0, db.left, h, Region.Op.UNION); 10795 } 10796 if (db.right < w) { 10797 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 10798 r.op(db.right, 0, w, h, Region.Op.UNION); 10799 } 10800 if (db.top > 0) { 10801 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 10802 r.op(0, 0, w, db.top, Region.Op.UNION); 10803 } 10804 if (db.bottom < h) { 10805 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 10806 r.op(0, db.bottom, w, h, Region.Op.UNION); 10807 } 10808 final int[] location = attachInfo.mTransparentLocation; 10809 getLocationInWindow(location); 10810 r.translate(location[0], location[1]); 10811 region.op(r, Region.Op.INTERSECT); 10812 } else { 10813 region.op(db, Region.Op.DIFFERENCE); 10814 } 10815 } 10816 10817 private void postCheckForLongClick(int delayOffset) { 10818 mHasPerformedLongPress = false; 10819 10820 if (mPendingCheckForLongPress == null) { 10821 mPendingCheckForLongPress = new CheckForLongPress(); 10822 } 10823 mPendingCheckForLongPress.rememberWindowAttachCount(); 10824 postDelayed(mPendingCheckForLongPress, 10825 ViewConfiguration.getLongPressTimeout() - delayOffset); 10826 } 10827 10828 /** 10829 * Inflate a view from an XML resource. This convenience method wraps the {@link 10830 * LayoutInflater} class, which provides a full range of options for view inflation. 10831 * 10832 * @param context The Context object for your activity or application. 10833 * @param resource The resource ID to inflate 10834 * @param root A view group that will be the parent. Used to properly inflate the 10835 * layout_* parameters. 10836 * @see LayoutInflater 10837 */ 10838 public static View inflate(Context context, int resource, ViewGroup root) { 10839 LayoutInflater factory = LayoutInflater.from(context); 10840 return factory.inflate(resource, root); 10841 } 10842 10843 /** 10844 * Scroll the view with standard behavior for scrolling beyond the normal 10845 * content boundaries. Views that call this method should override 10846 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 10847 * results of an over-scroll operation. 10848 * 10849 * Views can use this method to handle any touch or fling-based scrolling. 10850 * 10851 * @param deltaX Change in X in pixels 10852 * @param deltaY Change in Y in pixels 10853 * @param scrollX Current X scroll value in pixels before applying deltaX 10854 * @param scrollY Current Y scroll value in pixels before applying deltaY 10855 * @param scrollRangeX Maximum content scroll range along the X axis 10856 * @param scrollRangeY Maximum content scroll range along the Y axis 10857 * @param maxOverScrollX Number of pixels to overscroll by in either direction 10858 * along the X axis. 10859 * @param maxOverScrollY Number of pixels to overscroll by in either direction 10860 * along the Y axis. 10861 * @param isTouchEvent true if this scroll operation is the result of a touch event. 10862 * @return true if scrolling was clamped to an over-scroll boundary along either 10863 * axis, false otherwise. 10864 */ 10865 protected boolean overScrollBy(int deltaX, int deltaY, 10866 int scrollX, int scrollY, 10867 int scrollRangeX, int scrollRangeY, 10868 int maxOverScrollX, int maxOverScrollY, 10869 boolean isTouchEvent) { 10870 final int overScrollMode = mOverScrollMode; 10871 final boolean canScrollHorizontal = 10872 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 10873 final boolean canScrollVertical = 10874 computeVerticalScrollRange() > computeVerticalScrollExtent(); 10875 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 10876 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 10877 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 10878 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 10879 10880 int newScrollX = scrollX + deltaX; 10881 if (!overScrollHorizontal) { 10882 maxOverScrollX = 0; 10883 } 10884 10885 int newScrollY = scrollY + deltaY; 10886 if (!overScrollVertical) { 10887 maxOverScrollY = 0; 10888 } 10889 10890 // Clamp values if at the limits and record 10891 final int left = -maxOverScrollX; 10892 final int right = maxOverScrollX + scrollRangeX; 10893 final int top = -maxOverScrollY; 10894 final int bottom = maxOverScrollY + scrollRangeY; 10895 10896 boolean clampedX = false; 10897 if (newScrollX > right) { 10898 newScrollX = right; 10899 clampedX = true; 10900 } else if (newScrollX < left) { 10901 newScrollX = left; 10902 clampedX = true; 10903 } 10904 10905 boolean clampedY = false; 10906 if (newScrollY > bottom) { 10907 newScrollY = bottom; 10908 clampedY = true; 10909 } else if (newScrollY < top) { 10910 newScrollY = top; 10911 clampedY = true; 10912 } 10913 10914 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 10915 10916 return clampedX || clampedY; 10917 } 10918 10919 /** 10920 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 10921 * respond to the results of an over-scroll operation. 10922 * 10923 * @param scrollX New X scroll value in pixels 10924 * @param scrollY New Y scroll value in pixels 10925 * @param clampedX True if scrollX was clamped to an over-scroll boundary 10926 * @param clampedY True if scrollY was clamped to an over-scroll boundary 10927 */ 10928 protected void onOverScrolled(int scrollX, int scrollY, 10929 boolean clampedX, boolean clampedY) { 10930 // Intentionally empty. 10931 } 10932 10933 /** 10934 * Returns the over-scroll mode for this view. The result will be 10935 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 10936 * (allow over-scrolling only if the view content is larger than the container), 10937 * or {@link #OVER_SCROLL_NEVER}. 10938 * 10939 * @return This view's over-scroll mode. 10940 */ 10941 public int getOverScrollMode() { 10942 return mOverScrollMode; 10943 } 10944 10945 /** 10946 * Set the over-scroll mode for this view. Valid over-scroll modes are 10947 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 10948 * (allow over-scrolling only if the view content is larger than the container), 10949 * or {@link #OVER_SCROLL_NEVER}. 10950 * 10951 * Setting the over-scroll mode of a view will have an effect only if the 10952 * view is capable of scrolling. 10953 * 10954 * @param overScrollMode The new over-scroll mode for this view. 10955 */ 10956 public void setOverScrollMode(int overScrollMode) { 10957 if (overScrollMode != OVER_SCROLL_ALWAYS && 10958 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 10959 overScrollMode != OVER_SCROLL_NEVER) { 10960 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 10961 } 10962 mOverScrollMode = overScrollMode; 10963 } 10964 10965 /** 10966 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 10967 * Each MeasureSpec represents a requirement for either the width or the height. 10968 * A MeasureSpec is comprised of a size and a mode. There are three possible 10969 * modes: 10970 * <dl> 10971 * <dt>UNSPECIFIED</dt> 10972 * <dd> 10973 * The parent has not imposed any constraint on the child. It can be whatever size 10974 * it wants. 10975 * </dd> 10976 * 10977 * <dt>EXACTLY</dt> 10978 * <dd> 10979 * The parent has determined an exact size for the child. The child is going to be 10980 * given those bounds regardless of how big it wants to be. 10981 * </dd> 10982 * 10983 * <dt>AT_MOST</dt> 10984 * <dd> 10985 * The child can be as large as it wants up to the specified size. 10986 * </dd> 10987 * </dl> 10988 * 10989 * MeasureSpecs are implemented as ints to reduce object allocation. This class 10990 * is provided to pack and unpack the <size, mode> tuple into the int. 10991 */ 10992 public static class MeasureSpec { 10993 private static final int MODE_SHIFT = 30; 10994 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 10995 10996 /** 10997 * Measure specification mode: The parent has not imposed any constraint 10998 * on the child. It can be whatever size it wants. 10999 */ 11000 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 11001 11002 /** 11003 * Measure specification mode: The parent has determined an exact size 11004 * for the child. The child is going to be given those bounds regardless 11005 * of how big it wants to be. 11006 */ 11007 public static final int EXACTLY = 1 << MODE_SHIFT; 11008 11009 /** 11010 * Measure specification mode: The child can be as large as it wants up 11011 * to the specified size. 11012 */ 11013 public static final int AT_MOST = 2 << MODE_SHIFT; 11014 11015 /** 11016 * Creates a measure specification based on the supplied size and mode. 11017 * 11018 * The mode must always be one of the following: 11019 * <ul> 11020 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 11021 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 11022 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 11023 * </ul> 11024 * 11025 * @param size the size of the measure specification 11026 * @param mode the mode of the measure specification 11027 * @return the measure specification based on size and mode 11028 */ 11029 public static int makeMeasureSpec(int size, int mode) { 11030 return size + mode; 11031 } 11032 11033 /** 11034 * Extracts the mode from the supplied measure specification. 11035 * 11036 * @param measureSpec the measure specification to extract the mode from 11037 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 11038 * {@link android.view.View.MeasureSpec#AT_MOST} or 11039 * {@link android.view.View.MeasureSpec#EXACTLY} 11040 */ 11041 public static int getMode(int measureSpec) { 11042 return (measureSpec & MODE_MASK); 11043 } 11044 11045 /** 11046 * Extracts the size from the supplied measure specification. 11047 * 11048 * @param measureSpec the measure specification to extract the size from 11049 * @return the size in pixels defined in the supplied measure specification 11050 */ 11051 public static int getSize(int measureSpec) { 11052 return (measureSpec & ~MODE_MASK); 11053 } 11054 11055 /** 11056 * Returns a String representation of the specified measure 11057 * specification. 11058 * 11059 * @param measureSpec the measure specification to convert to a String 11060 * @return a String with the following format: "MeasureSpec: MODE SIZE" 11061 */ 11062 public static String toString(int measureSpec) { 11063 int mode = getMode(measureSpec); 11064 int size = getSize(measureSpec); 11065 11066 StringBuilder sb = new StringBuilder("MeasureSpec: "); 11067 11068 if (mode == UNSPECIFIED) 11069 sb.append("UNSPECIFIED "); 11070 else if (mode == EXACTLY) 11071 sb.append("EXACTLY "); 11072 else if (mode == AT_MOST) 11073 sb.append("AT_MOST "); 11074 else 11075 sb.append(mode).append(" "); 11076 11077 sb.append(size); 11078 return sb.toString(); 11079 } 11080 } 11081 11082 class CheckForLongPress implements Runnable { 11083 11084 private int mOriginalWindowAttachCount; 11085 11086 public void run() { 11087 if (isPressed() && (mParent != null) 11088 && mOriginalWindowAttachCount == mWindowAttachCount) { 11089 if (performLongClick()) { 11090 mHasPerformedLongPress = true; 11091 } 11092 } 11093 } 11094 11095 public void rememberWindowAttachCount() { 11096 mOriginalWindowAttachCount = mWindowAttachCount; 11097 } 11098 } 11099 11100 private final class CheckForTap implements Runnable { 11101 public void run() { 11102 mPrivateFlags &= ~PREPRESSED; 11103 mPrivateFlags |= PRESSED; 11104 refreshDrawableState(); 11105 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 11106 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 11107 } 11108 } 11109 } 11110 11111 private final class PerformClick implements Runnable { 11112 public void run() { 11113 performClick(); 11114 } 11115 } 11116 11117 /** 11118 * Interface definition for a callback to be invoked when a key event is 11119 * dispatched to this view. The callback will be invoked before the key 11120 * event is given to the view. 11121 */ 11122 public interface OnKeyListener { 11123 /** 11124 * Called when a key is dispatched to a view. This allows listeners to 11125 * get a chance to respond before the target view. 11126 * 11127 * @param v The view the key has been dispatched to. 11128 * @param keyCode The code for the physical key that was pressed 11129 * @param event The KeyEvent object containing full information about 11130 * the event. 11131 * @return True if the listener has consumed the event, false otherwise. 11132 */ 11133 boolean onKey(View v, int keyCode, KeyEvent event); 11134 } 11135 11136 /** 11137 * Interface definition for a callback to be invoked when a touch event is 11138 * dispatched to this view. The callback will be invoked before the touch 11139 * event is given to the view. 11140 */ 11141 public interface OnTouchListener { 11142 /** 11143 * Called when a touch event is dispatched to a view. This allows listeners to 11144 * get a chance to respond before the target view. 11145 * 11146 * @param v The view the touch event has been dispatched to. 11147 * @param event The MotionEvent object containing full information about 11148 * the event. 11149 * @return True if the listener has consumed the event, false otherwise. 11150 */ 11151 boolean onTouch(View v, MotionEvent event); 11152 } 11153 11154 /** 11155 * Interface definition for a callback to be invoked when a view has been clicked and held. 11156 */ 11157 public interface OnLongClickListener { 11158 /** 11159 * Called when a view has been clicked and held. 11160 * 11161 * @param v The view that was clicked and held. 11162 * 11163 * @return true if the callback consumed the long click, false otherwise. 11164 */ 11165 boolean onLongClick(View v); 11166 } 11167 11168 /** 11169 * Interface definition for a callback to be invoked when a drag is being dispatched 11170 * to this view. The callback will be invoked before the hosting view's own 11171 * onDrag(event) method. If the listener wants to fall back to the hosting view's 11172 * onDrag(event) behavior, it should return 'false' from this callback. 11173 */ 11174 public interface OnDragListener { 11175 /** 11176 * Called when a drag event is dispatched to a view. This allows listeners 11177 * to get a chance to override base View behavior. 11178 * 11179 * @param v The view the drag has been dispatched to. 11180 * @param event The DragEvent object containing full information 11181 * about the event. 11182 * @return true if the listener consumed the DragEvent, false in order to fall 11183 * back to the view's default handling. 11184 */ 11185 boolean onDrag(View v, DragEvent event); 11186 } 11187 11188 /** 11189 * Interface definition for a callback to be invoked when the focus state of 11190 * a view changed. 11191 */ 11192 public interface OnFocusChangeListener { 11193 /** 11194 * Called when the focus state of a view has changed. 11195 * 11196 * @param v The view whose state has changed. 11197 * @param hasFocus The new focus state of v. 11198 */ 11199 void onFocusChange(View v, boolean hasFocus); 11200 } 11201 11202 /** 11203 * Interface definition for a callback to be invoked when a view is clicked. 11204 */ 11205 public interface OnClickListener { 11206 /** 11207 * Called when a view has been clicked. 11208 * 11209 * @param v The view that was clicked. 11210 */ 11211 void onClick(View v); 11212 } 11213 11214 /** 11215 * Interface definition for a callback to be invoked when the context menu 11216 * for this view is being built. 11217 */ 11218 public interface OnCreateContextMenuListener { 11219 /** 11220 * Called when the context menu for this view is being built. It is not 11221 * safe to hold onto the menu after this method returns. 11222 * 11223 * @param menu The context menu that is being built 11224 * @param v The view for which the context menu is being built 11225 * @param menuInfo Extra information about the item for which the 11226 * context menu should be shown. This information will vary 11227 * depending on the class of v. 11228 */ 11229 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 11230 } 11231 11232 private final class UnsetPressedState implements Runnable { 11233 public void run() { 11234 setPressed(false); 11235 } 11236 } 11237 11238 /** 11239 * Base class for derived classes that want to save and restore their own 11240 * state in {@link android.view.View#onSaveInstanceState()}. 11241 */ 11242 public static class BaseSavedState extends AbsSavedState { 11243 /** 11244 * Constructor used when reading from a parcel. Reads the state of the superclass. 11245 * 11246 * @param source 11247 */ 11248 public BaseSavedState(Parcel source) { 11249 super(source); 11250 } 11251 11252 /** 11253 * Constructor called by derived classes when creating their SavedState objects 11254 * 11255 * @param superState The state of the superclass of this view 11256 */ 11257 public BaseSavedState(Parcelable superState) { 11258 super(superState); 11259 } 11260 11261 public static final Parcelable.Creator<BaseSavedState> CREATOR = 11262 new Parcelable.Creator<BaseSavedState>() { 11263 public BaseSavedState createFromParcel(Parcel in) { 11264 return new BaseSavedState(in); 11265 } 11266 11267 public BaseSavedState[] newArray(int size) { 11268 return new BaseSavedState[size]; 11269 } 11270 }; 11271 } 11272 11273 /** 11274 * A set of information given to a view when it is attached to its parent 11275 * window. 11276 */ 11277 static class AttachInfo { 11278 interface Callbacks { 11279 void playSoundEffect(int effectId); 11280 boolean performHapticFeedback(int effectId, boolean always); 11281 } 11282 11283 /** 11284 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 11285 * to a Handler. This class contains the target (View) to invalidate and 11286 * the coordinates of the dirty rectangle. 11287 * 11288 * For performance purposes, this class also implements a pool of up to 11289 * POOL_LIMIT objects that get reused. This reduces memory allocations 11290 * whenever possible. 11291 */ 11292 static class InvalidateInfo implements Poolable<InvalidateInfo> { 11293 private static final int POOL_LIMIT = 10; 11294 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 11295 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 11296 public InvalidateInfo newInstance() { 11297 return new InvalidateInfo(); 11298 } 11299 11300 public void onAcquired(InvalidateInfo element) { 11301 } 11302 11303 public void onReleased(InvalidateInfo element) { 11304 } 11305 }, POOL_LIMIT) 11306 ); 11307 11308 private InvalidateInfo mNext; 11309 11310 View target; 11311 11312 int left; 11313 int top; 11314 int right; 11315 int bottom; 11316 11317 public void setNextPoolable(InvalidateInfo element) { 11318 mNext = element; 11319 } 11320 11321 public InvalidateInfo getNextPoolable() { 11322 return mNext; 11323 } 11324 11325 static InvalidateInfo acquire() { 11326 return sPool.acquire(); 11327 } 11328 11329 void release() { 11330 sPool.release(this); 11331 } 11332 } 11333 11334 final IWindowSession mSession; 11335 11336 final IWindow mWindow; 11337 11338 final IBinder mWindowToken; 11339 11340 final Callbacks mRootCallbacks; 11341 11342 /** 11343 * The top view of the hierarchy. 11344 */ 11345 View mRootView; 11346 11347 IBinder mPanelParentWindowToken; 11348 Surface mSurface; 11349 11350 boolean mHardwareAccelerated; 11351 boolean mHardwareAccelerationRequested; 11352 HardwareRenderer mHardwareRenderer; 11353 11354 /** 11355 * Scale factor used by the compatibility mode 11356 */ 11357 float mApplicationScale; 11358 11359 /** 11360 * Indicates whether the application is in compatibility mode 11361 */ 11362 boolean mScalingRequired; 11363 11364 /** 11365 * Left position of this view's window 11366 */ 11367 int mWindowLeft; 11368 11369 /** 11370 * Top position of this view's window 11371 */ 11372 int mWindowTop; 11373 11374 /** 11375 * Indicates whether views need to use 32-bit drawing caches 11376 */ 11377 boolean mUse32BitDrawingCache; 11378 11379 /** 11380 * For windows that are full-screen but using insets to layout inside 11381 * of the screen decorations, these are the current insets for the 11382 * content of the window. 11383 */ 11384 final Rect mContentInsets = new Rect(); 11385 11386 /** 11387 * For windows that are full-screen but using insets to layout inside 11388 * of the screen decorations, these are the current insets for the 11389 * actual visible parts of the window. 11390 */ 11391 final Rect mVisibleInsets = new Rect(); 11392 11393 /** 11394 * The internal insets given by this window. This value is 11395 * supplied by the client (through 11396 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 11397 * be given to the window manager when changed to be used in laying 11398 * out windows behind it. 11399 */ 11400 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 11401 = new ViewTreeObserver.InternalInsetsInfo(); 11402 11403 /** 11404 * All views in the window's hierarchy that serve as scroll containers, 11405 * used to determine if the window can be resized or must be panned 11406 * to adjust for a soft input area. 11407 */ 11408 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 11409 11410 final KeyEvent.DispatcherState mKeyDispatchState 11411 = new KeyEvent.DispatcherState(); 11412 11413 /** 11414 * Indicates whether the view's window currently has the focus. 11415 */ 11416 boolean mHasWindowFocus; 11417 11418 /** 11419 * The current visibility of the window. 11420 */ 11421 int mWindowVisibility; 11422 11423 /** 11424 * Indicates the time at which drawing started to occur. 11425 */ 11426 long mDrawingTime; 11427 11428 /** 11429 * Indicates whether or not ignoring the DIRTY_MASK flags. 11430 */ 11431 boolean mIgnoreDirtyState; 11432 11433 /** 11434 * Indicates whether the view's window is currently in touch mode. 11435 */ 11436 boolean mInTouchMode; 11437 11438 /** 11439 * Indicates that ViewRoot should trigger a global layout change 11440 * the next time it performs a traversal 11441 */ 11442 boolean mRecomputeGlobalAttributes; 11443 11444 /** 11445 * Set during a traveral if any views want to keep the screen on. 11446 */ 11447 boolean mKeepScreenOn; 11448 11449 /** 11450 * Set if the visibility of any views has changed. 11451 */ 11452 boolean mViewVisibilityChanged; 11453 11454 /** 11455 * Set to true if a view has been scrolled. 11456 */ 11457 boolean mViewScrollChanged; 11458 11459 /** 11460 * Global to the view hierarchy used as a temporary for dealing with 11461 * x/y points in the transparent region computations. 11462 */ 11463 final int[] mTransparentLocation = new int[2]; 11464 11465 /** 11466 * Global to the view hierarchy used as a temporary for dealing with 11467 * x/y points in the ViewGroup.invalidateChild implementation. 11468 */ 11469 final int[] mInvalidateChildLocation = new int[2]; 11470 11471 11472 /** 11473 * Global to the view hierarchy used as a temporary for dealing with 11474 * x/y location when view is transformed. 11475 */ 11476 final float[] mTmpTransformLocation = new float[2]; 11477 11478 /** 11479 * The view tree observer used to dispatch global events like 11480 * layout, pre-draw, touch mode change, etc. 11481 */ 11482 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 11483 11484 /** 11485 * A Canvas used by the view hierarchy to perform bitmap caching. 11486 */ 11487 Canvas mCanvas; 11488 11489 /** 11490 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 11491 * handler can be used to pump events in the UI events queue. 11492 */ 11493 final Handler mHandler; 11494 11495 /** 11496 * Identifier for messages requesting the view to be invalidated. 11497 * Such messages should be sent to {@link #mHandler}. 11498 */ 11499 static final int INVALIDATE_MSG = 0x1; 11500 11501 /** 11502 * Identifier for messages requesting the view to invalidate a region. 11503 * Such messages should be sent to {@link #mHandler}. 11504 */ 11505 static final int INVALIDATE_RECT_MSG = 0x2; 11506 11507 /** 11508 * Temporary for use in computing invalidate rectangles while 11509 * calling up the hierarchy. 11510 */ 11511 final Rect mTmpInvalRect = new Rect(); 11512 11513 /** 11514 * Temporary for use in computing hit areas with transformed views 11515 */ 11516 final RectF mTmpTransformRect = new RectF(); 11517 11518 /** 11519 * Temporary list for use in collecting focusable descendents of a view. 11520 */ 11521 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 11522 11523 /** 11524 * Creates a new set of attachment information with the specified 11525 * events handler and thread. 11526 * 11527 * @param handler the events handler the view must use 11528 */ 11529 AttachInfo(IWindowSession session, IWindow window, 11530 Handler handler, Callbacks effectPlayer) { 11531 mSession = session; 11532 mWindow = window; 11533 mWindowToken = window.asBinder(); 11534 mHandler = handler; 11535 mRootCallbacks = effectPlayer; 11536 } 11537 } 11538 11539 /** 11540 * <p>ScrollabilityCache holds various fields used by a View when scrolling 11541 * is supported. This avoids keeping too many unused fields in most 11542 * instances of View.</p> 11543 */ 11544 private static class ScrollabilityCache implements Runnable { 11545 11546 /** 11547 * Scrollbars are not visible 11548 */ 11549 public static final int OFF = 0; 11550 11551 /** 11552 * Scrollbars are visible 11553 */ 11554 public static final int ON = 1; 11555 11556 /** 11557 * Scrollbars are fading away 11558 */ 11559 public static final int FADING = 2; 11560 11561 public boolean fadeScrollBars; 11562 11563 public int fadingEdgeLength; 11564 public int scrollBarDefaultDelayBeforeFade; 11565 public int scrollBarFadeDuration; 11566 11567 public int scrollBarSize; 11568 public ScrollBarDrawable scrollBar; 11569 public float[] interpolatorValues; 11570 public View host; 11571 11572 public final Paint paint; 11573 public final Matrix matrix; 11574 public Shader shader; 11575 11576 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 11577 11578 private static final float[] OPAQUE = { 255 }; 11579 private static final float[] TRANSPARENT = { 0.0f }; 11580 11581 /** 11582 * When fading should start. This time moves into the future every time 11583 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 11584 */ 11585 public long fadeStartTime; 11586 11587 11588 /** 11589 * The current state of the scrollbars: ON, OFF, or FADING 11590 */ 11591 public int state = OFF; 11592 11593 private int mLastColor; 11594 11595 public ScrollabilityCache(ViewConfiguration configuration, View host) { 11596 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 11597 scrollBarSize = configuration.getScaledScrollBarSize(); 11598 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 11599 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 11600 11601 paint = new Paint(); 11602 matrix = new Matrix(); 11603 // use use a height of 1, and then wack the matrix each time we 11604 // actually use it. 11605 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 11606 11607 paint.setShader(shader); 11608 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 11609 this.host = host; 11610 } 11611 11612 public void setFadeColor(int color) { 11613 if (color != 0 && color != mLastColor) { 11614 mLastColor = color; 11615 color |= 0xFF000000; 11616 11617 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 11618 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 11619 11620 paint.setShader(shader); 11621 // Restore the default transfer mode (src_over) 11622 paint.setXfermode(null); 11623 } 11624 } 11625 11626 public void run() { 11627 long now = AnimationUtils.currentAnimationTimeMillis(); 11628 if (now >= fadeStartTime) { 11629 11630 // the animation fades the scrollbars out by changing 11631 // the opacity (alpha) from fully opaque to fully 11632 // transparent 11633 int nextFrame = (int) now; 11634 int framesCount = 0; 11635 11636 Interpolator interpolator = scrollBarInterpolator; 11637 11638 // Start opaque 11639 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 11640 11641 // End transparent 11642 nextFrame += scrollBarFadeDuration; 11643 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 11644 11645 state = FADING; 11646 11647 // Kick off the fade animation 11648 host.invalidate(); 11649 } 11650 } 11651 11652 } 11653} 11654