View.java revision 40c18f59ac3bd0e14ac9c7ed6467e52fb8f95640
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 android.content.ClipData; 20import android.content.Context; 21import android.content.res.Configuration; 22import android.content.res.Resources; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Camera; 26import android.graphics.Canvas; 27import android.graphics.Interpolator; 28import android.graphics.LinearGradient; 29import android.graphics.Matrix; 30import android.graphics.Paint; 31import android.graphics.PixelFormat; 32import android.graphics.Point; 33import android.graphics.PorterDuff; 34import android.graphics.PorterDuffXfermode; 35import android.graphics.Rect; 36import android.graphics.RectF; 37import android.graphics.Region; 38import android.graphics.Shader; 39import android.graphics.drawable.ColorDrawable; 40import android.graphics.drawable.Drawable; 41import android.os.Handler; 42import android.os.IBinder; 43import android.os.Message; 44import android.os.Parcel; 45import android.os.Parcelable; 46import android.os.RemoteException; 47import android.os.SystemClock; 48import android.util.AttributeSet; 49import android.util.FloatProperty; 50import android.util.LocaleUtil; 51import android.util.Log; 52import android.util.Pool; 53import android.util.Poolable; 54import android.util.PoolableManager; 55import android.util.Pools; 56import android.util.Property; 57import android.util.SparseArray; 58import android.util.TypedValue; 59import android.view.ContextMenu.ContextMenuInfo; 60import android.view.accessibility.AccessibilityEvent; 61import android.view.accessibility.AccessibilityEventSource; 62import android.view.accessibility.AccessibilityManager; 63import android.view.accessibility.AccessibilityNodeInfo; 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 com.android.internal.R; 72import com.android.internal.util.Predicate; 73import com.android.internal.view.menu.MenuBuilder; 74 75import java.lang.ref.WeakReference; 76import java.lang.reflect.InvocationTargetException; 77import java.lang.reflect.Method; 78import java.util.ArrayList; 79import java.util.Arrays; 80import java.util.Locale; 81import java.util.WeakHashMap; 82import java.util.concurrent.CopyOnWriteArrayList; 83 84/** 85 * <p> 86 * This class represents the basic building block for user interface components. A View 87 * occupies a rectangular area on the screen and is responsible for drawing and 88 * event handling. View is the base class for <em>widgets</em>, which are 89 * used to create interactive UI components (buttons, text fields, etc.). The 90 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 91 * are invisible containers that hold other Views (or other ViewGroups) and define 92 * their layout properties. 93 * </p> 94 * 95 * <div class="special"> 96 * <p>For an introduction to using this class to develop your 97 * application's user interface, read the Developer Guide documentation on 98 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 99 * include: 100 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 103 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 104 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 105 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 106 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 107 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 108 * </p> 109 * </div> 110 * 111 * <a name="Using"></a> 112 * <h3>Using Views</h3> 113 * <p> 114 * All of the views in a window are arranged in a single tree. You can add views 115 * either from code or by specifying a tree of views in one or more XML layout 116 * files. There are many specialized subclasses of views that act as controls or 117 * are capable of displaying text, images, or other content. 118 * </p> 119 * <p> 120 * Once you have created a tree of views, there are typically a few types of 121 * common operations you may wish to perform: 122 * <ul> 123 * <li><strong>Set properties:</strong> for example setting the text of a 124 * {@link android.widget.TextView}. The available properties and the methods 125 * that set them will vary among the different subclasses of views. Note that 126 * properties that are known at build time can be set in the XML layout 127 * files.</li> 128 * <li><strong>Set focus:</strong> The framework will handled moving focus in 129 * response to user input. To force focus to a specific view, call 130 * {@link #requestFocus}.</li> 131 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 132 * that will be notified when something interesting happens to the view. For 133 * example, all views will let you set a listener to be notified when the view 134 * gains or loses focus. You can register such a listener using 135 * {@link #setOnFocusChangeListener(android.view.View.OnFocusChangeListener)}. 136 * Other view subclasses offer more specialized listeners. For example, a Button 137 * exposes a listener to notify clients when the button is clicked.</li> 138 * <li><strong>Set visibility:</strong> You can hide or show views using 139 * {@link #setVisibility(int)}.</li> 140 * </ul> 141 * </p> 142 * <p><em> 143 * Note: The Android framework is responsible for measuring, laying out and 144 * drawing views. You should not call methods that perform these actions on 145 * views yourself unless you are actually implementing a 146 * {@link android.view.ViewGroup}. 147 * </em></p> 148 * 149 * <a name="Lifecycle"></a> 150 * <h3>Implementing a Custom View</h3> 151 * 152 * <p> 153 * To implement a custom view, you will usually begin by providing overrides for 154 * some of the standard methods that the framework calls on all views. You do 155 * not need to override all of these methods. In fact, you can start by just 156 * overriding {@link #onDraw(android.graphics.Canvas)}. 157 * <table border="2" width="85%" align="center" cellpadding="5"> 158 * <thead> 159 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 160 * </thead> 161 * 162 * <tbody> 163 * <tr> 164 * <td rowspan="2">Creation</td> 165 * <td>Constructors</td> 166 * <td>There is a form of the constructor that are called when the view 167 * is created from code and a form that is called when the view is 168 * inflated from a layout file. The second form should parse and apply 169 * any attributes defined in the layout file. 170 * </td> 171 * </tr> 172 * <tr> 173 * <td><code>{@link #onFinishInflate()}</code></td> 174 * <td>Called after a view and all of its children has been inflated 175 * from XML.</td> 176 * </tr> 177 * 178 * <tr> 179 * <td rowspan="3">Layout</td> 180 * <td><code>{@link #onMeasure(int, int)}</code></td> 181 * <td>Called to determine the size requirements for this view and all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onLayout(boolean, int, int, int, int)}</code></td> 187 * <td>Called when this view should assign a size and position to all 188 * of its children. 189 * </td> 190 * </tr> 191 * <tr> 192 * <td><code>{@link #onSizeChanged(int, int, int, int)}</code></td> 193 * <td>Called when the size of this view has changed. 194 * </td> 195 * </tr> 196 * 197 * <tr> 198 * <td>Drawing</td> 199 * <td><code>{@link #onDraw(android.graphics.Canvas)}</code></td> 200 * <td>Called when the view should render its content. 201 * </td> 202 * </tr> 203 * 204 * <tr> 205 * <td rowspan="4">Event processing</td> 206 * <td><code>{@link #onKeyDown(int, KeyEvent)}</code></td> 207 * <td>Called when a new key event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onKeyUp(int, KeyEvent)}</code></td> 212 * <td>Called when a key up event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTrackballEvent(MotionEvent)}</code></td> 217 * <td>Called when a trackball motion event occurs. 218 * </td> 219 * </tr> 220 * <tr> 221 * <td><code>{@link #onTouchEvent(MotionEvent)}</code></td> 222 * <td>Called when a touch screen motion event occurs. 223 * </td> 224 * </tr> 225 * 226 * <tr> 227 * <td rowspan="2">Focus</td> 228 * <td><code>{@link #onFocusChanged(boolean, int, android.graphics.Rect)}</code></td> 229 * <td>Called when the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td><code>{@link #onWindowFocusChanged(boolean)}</code></td> 235 * <td>Called when the window containing the view gains or loses focus. 236 * </td> 237 * </tr> 238 * 239 * <tr> 240 * <td rowspan="3">Attaching</td> 241 * <td><code>{@link #onAttachedToWindow()}</code></td> 242 * <td>Called when the view is attached to a window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onDetachedFromWindow}</code></td> 248 * <td>Called when the view is detached from its window. 249 * </td> 250 * </tr> 251 * 252 * <tr> 253 * <td><code>{@link #onWindowVisibilityChanged(int)}</code></td> 254 * <td>Called when the visibility of the window containing the view 255 * has changed. 256 * </td> 257 * </tr> 258 * </tbody> 259 * 260 * </table> 261 * </p> 262 * 263 * <a name="IDs"></a> 264 * <h3>IDs</h3> 265 * Views may have an integer id associated with them. These ids are typically 266 * assigned in the layout XML files, and are used to find specific views within 267 * the view tree. A common pattern is to: 268 * <ul> 269 * <li>Define a Button in the layout file and assign it a unique ID. 270 * <pre> 271 * <Button 272 * android:id="@+id/my_button" 273 * android:layout_width="wrap_content" 274 * android:layout_height="wrap_content" 275 * android:text="@string/my_button_text"/> 276 * </pre></li> 277 * <li>From the onCreate method of an Activity, find the Button 278 * <pre class="prettyprint"> 279 * Button myButton = (Button) findViewById(R.id.my_button); 280 * </pre></li> 281 * </ul> 282 * <p> 283 * View IDs need not be unique throughout the tree, but it is good practice to 284 * ensure that they are at least unique within the part of the tree you are 285 * searching. 286 * </p> 287 * 288 * <a name="Position"></a> 289 * <h3>Position</h3> 290 * <p> 291 * The geometry of a view is that of a rectangle. A view has a location, 292 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 293 * two dimensions, expressed as a width and a height. The unit for location 294 * and dimensions is the pixel. 295 * </p> 296 * 297 * <p> 298 * It is possible to retrieve the location of a view by invoking the methods 299 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 300 * coordinate of the rectangle representing the view. The latter returns the 301 * top, or Y, coordinate of the rectangle representing the view. These methods 302 * both return the location of the view relative to its parent. For instance, 303 * when getLeft() returns 20, that means the view is located 20 pixels to the 304 * right of the left edge of its direct parent. 305 * </p> 306 * 307 * <p> 308 * In addition, several convenience methods are offered to avoid unnecessary 309 * computations, namely {@link #getRight()} and {@link #getBottom()}. 310 * These methods return the coordinates of the right and bottom edges of the 311 * rectangle representing the view. For instance, calling {@link #getRight()} 312 * is similar to the following computation: <code>getLeft() + getWidth()</code> 313 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 314 * </p> 315 * 316 * <a name="SizePaddingMargins"></a> 317 * <h3>Size, padding and margins</h3> 318 * <p> 319 * The size of a view is expressed with a width and a height. A view actually 320 * possess two pairs of width and height values. 321 * </p> 322 * 323 * <p> 324 * The first pair is known as <em>measured width</em> and 325 * <em>measured height</em>. These dimensions define how big a view wants to be 326 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 327 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 328 * and {@link #getMeasuredHeight()}. 329 * </p> 330 * 331 * <p> 332 * The second pair is simply known as <em>width</em> and <em>height</em>, or 333 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 334 * dimensions define the actual size of the view on screen, at drawing time and 335 * after layout. These values may, but do not have to, be different from the 336 * measured width and height. The width and height can be obtained by calling 337 * {@link #getWidth()} and {@link #getHeight()}. 338 * </p> 339 * 340 * <p> 341 * To measure its dimensions, a view takes into account its padding. The padding 342 * is expressed in pixels for the left, top, right and bottom parts of the view. 343 * Padding can be used to offset the content of the view by a specific amount of 344 * pixels. For instance, a left padding of 2 will push the view's content by 345 * 2 pixels to the right of the left edge. Padding can be set using the 346 * {@link #setPadding(int, int, int, int)} method and queried by calling 347 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 348 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}. 349 * </p> 350 * 351 * <p> 352 * Even though a view can define a padding, it does not provide any support for 353 * margins. However, view groups provide such a support. Refer to 354 * {@link android.view.ViewGroup} and 355 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 356 * </p> 357 * 358 * <a name="Layout"></a> 359 * <h3>Layout</h3> 360 * <p> 361 * Layout is a two pass process: a measure pass and a layout pass. The measuring 362 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 363 * of the view tree. Each view pushes dimension specifications down the tree 364 * during the recursion. At the end of the measure pass, every view has stored 365 * its measurements. The second pass happens in 366 * {@link #layout(int,int,int,int)} and is also top-down. During 367 * this pass each parent is responsible for positioning all of its children 368 * using the sizes computed in the measure pass. 369 * </p> 370 * 371 * <p> 372 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 373 * {@link #getMeasuredHeight()} values must be set, along with those for all of 374 * that view's descendants. A view's measured width and measured height values 375 * must respect the constraints imposed by the view's parents. This guarantees 376 * that at the end of the measure pass, all parents accept all of their 377 * children's measurements. A parent view may call measure() more than once on 378 * its children. For example, the parent may measure each child once with 379 * unspecified dimensions to find out how big they want to be, then call 380 * measure() on them again with actual numbers if the sum of all the children's 381 * unconstrained sizes is too big or too small. 382 * </p> 383 * 384 * <p> 385 * The measure pass uses two classes to communicate dimensions. The 386 * {@link MeasureSpec} class is used by views to tell their parents how they 387 * want to be measured and positioned. The base LayoutParams class just 388 * describes how big the view wants to be for both width and height. For each 389 * dimension, it can specify one of: 390 * <ul> 391 * <li> an exact number 392 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 393 * (minus padding) 394 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 395 * enclose its content (plus padding). 396 * </ul> 397 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 398 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 399 * an X and Y value. 400 * </p> 401 * 402 * <p> 403 * MeasureSpecs are used to push requirements down the tree from parent to 404 * child. A MeasureSpec can be in one of three modes: 405 * <ul> 406 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 407 * of a child view. For example, a LinearLayout may call measure() on its child 408 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 409 * tall the child view wants to be given a width of 240 pixels. 410 * <li>EXACTLY: This is used by the parent to impose an exact size on the 411 * child. The child must use this size, and guarantee that all of its 412 * descendants will fit within this size. 413 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 414 * child. The child must gurantee that it and all of its descendants will fit 415 * within this size. 416 * </ul> 417 * </p> 418 * 419 * <p> 420 * To intiate a layout, call {@link #requestLayout}. This method is typically 421 * called by a view on itself when it believes that is can no longer fit within 422 * its current bounds. 423 * </p> 424 * 425 * <a name="Drawing"></a> 426 * <h3>Drawing</h3> 427 * <p> 428 * Drawing is handled by walking the tree and rendering each view that 429 * intersects the the invalid region. Because the tree is traversed in-order, 430 * this means that parents will draw before (i.e., behind) their children, with 431 * siblings drawn in the order they appear in the tree. 432 * If you set a background drawable for a View, then the View will draw it for you 433 * before calling back to its <code>onDraw()</code> method. 434 * </p> 435 * 436 * <p> 437 * Note that the framework will not draw views that are not in the invalid region. 438 * </p> 439 * 440 * <p> 441 * To force a view to draw, call {@link #invalidate()}. 442 * </p> 443 * 444 * <a name="EventHandlingThreading"></a> 445 * <h3>Event Handling and Threading</h3> 446 * <p> 447 * The basic cycle of a view is as follows: 448 * <ol> 449 * <li>An event comes in and is dispatched to the appropriate view. The view 450 * handles the event and notifies any listeners.</li> 451 * <li>If in the course of processing the event, the view's bounds may need 452 * to be changed, the view will call {@link #requestLayout()}.</li> 453 * <li>Similarly, if in the course of processing the event the view's appearance 454 * may need to be changed, the view will call {@link #invalidate()}.</li> 455 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 456 * the framework will take care of measuring, laying out, and drawing the tree 457 * as appropriate.</li> 458 * </ol> 459 * </p> 460 * 461 * <p><em>Note: The entire view tree is single threaded. You must always be on 462 * the UI thread when calling any method on any view.</em> 463 * If you are doing work on other threads and want to update the state of a view 464 * from that thread, you should use a {@link Handler}. 465 * </p> 466 * 467 * <a name="FocusHandling"></a> 468 * <h3>Focus Handling</h3> 469 * <p> 470 * The framework will handle routine focus movement in response to user input. 471 * This includes changing the focus as views are removed or hidden, or as new 472 * views become available. Views indicate their willingness to take focus 473 * through the {@link #isFocusable} method. To change whether a view can take 474 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 475 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 476 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 477 * </p> 478 * <p> 479 * Focus movement is based on an algorithm which finds the nearest neighbor in a 480 * given direction. In rare cases, the default algorithm may not match the 481 * intended behavior of the developer. In these situations, you can provide 482 * explicit overrides by using these XML attributes in the layout file: 483 * <pre> 484 * nextFocusDown 485 * nextFocusLeft 486 * nextFocusRight 487 * nextFocusUp 488 * </pre> 489 * </p> 490 * 491 * 492 * <p> 493 * To get a particular view to take focus, call {@link #requestFocus()}. 494 * </p> 495 * 496 * <a name="TouchMode"></a> 497 * <h3>Touch Mode</h3> 498 * <p> 499 * When a user is navigating a user interface via directional keys such as a D-pad, it is 500 * necessary to give focus to actionable items such as buttons so the user can see 501 * what will take input. If the device has touch capabilities, however, and the user 502 * begins interacting with the interface by touching it, it is no longer necessary to 503 * always highlight, or give focus to, a particular view. This motivates a mode 504 * for interaction named 'touch mode'. 505 * </p> 506 * <p> 507 * For a touch capable device, once the user touches the screen, the device 508 * will enter touch mode. From this point onward, only views for which 509 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 510 * Other views that are touchable, like buttons, will not take focus when touched; they will 511 * only fire the on click listeners. 512 * </p> 513 * <p> 514 * Any time a user hits a directional key, such as a D-pad direction, the view device will 515 * exit touch mode, and find a view to take focus, so that the user may resume interacting 516 * with the user interface without touching the screen again. 517 * </p> 518 * <p> 519 * The touch mode state is maintained across {@link android.app.Activity}s. Call 520 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 521 * </p> 522 * 523 * <a name="Scrolling"></a> 524 * <h3>Scrolling</h3> 525 * <p> 526 * The framework provides basic support for views that wish to internally 527 * scroll their content. This includes keeping track of the X and Y scroll 528 * offset as well as mechanisms for drawing scrollbars. See 529 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 530 * {@link #awakenScrollBars()} for more details. 531 * </p> 532 * 533 * <a name="Tags"></a> 534 * <h3>Tags</h3> 535 * <p> 536 * Unlike IDs, tags are not used to identify views. Tags are essentially an 537 * extra piece of information that can be associated with a view. They are most 538 * often used as a convenience to store data related to views in the views 539 * themselves rather than by putting them in a separate structure. 540 * </p> 541 * 542 * <a name="Animation"></a> 543 * <h3>Animation</h3> 544 * <p> 545 * You can attach an {@link Animation} object to a view using 546 * {@link #setAnimation(Animation)} or 547 * {@link #startAnimation(Animation)}. The animation can alter the scale, 548 * rotation, translation and alpha of a view over time. If the animation is 549 * attached to a view that has children, the animation will affect the entire 550 * subtree rooted by that node. When an animation is started, the framework will 551 * take care of redrawing the appropriate views until the animation completes. 552 * </p> 553 * <p> 554 * Starting with Android 3.0, the preferred way of animating views is to use the 555 * {@link android.animation} package APIs. 556 * </p> 557 * 558 * <a name="Security"></a> 559 * <h3>Security</h3> 560 * <p> 561 * Sometimes it is essential that an application be able to verify that an action 562 * is being performed with the full knowledge and consent of the user, such as 563 * granting a permission request, making a purchase or clicking on an advertisement. 564 * Unfortunately, a malicious application could try to spoof the user into 565 * performing these actions, unaware, by concealing the intended purpose of the view. 566 * As a remedy, the framework offers a touch filtering mechanism that can be used to 567 * improve the security of views that provide access to sensitive functionality. 568 * </p><p> 569 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 570 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 571 * will discard touches that are received whenever the view's window is obscured by 572 * another visible window. As a result, the view will not receive touches whenever a 573 * toast, dialog or other window appears above the view's window. 574 * </p><p> 575 * For more fine-grained control over security, consider overriding the 576 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 577 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 578 * </p> 579 * 580 * @attr ref android.R.styleable#View_alpha 581 * @attr ref android.R.styleable#View_background 582 * @attr ref android.R.styleable#View_clickable 583 * @attr ref android.R.styleable#View_contentDescription 584 * @attr ref android.R.styleable#View_drawingCacheQuality 585 * @attr ref android.R.styleable#View_duplicateParentState 586 * @attr ref android.R.styleable#View_id 587 * @attr ref android.R.styleable#View_fadingEdge 588 * @attr ref android.R.styleable#View_fadingEdgeLength 589 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 590 * @attr ref android.R.styleable#View_fitsSystemWindows 591 * @attr ref android.R.styleable#View_isScrollContainer 592 * @attr ref android.R.styleable#View_focusable 593 * @attr ref android.R.styleable#View_focusableInTouchMode 594 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 595 * @attr ref android.R.styleable#View_keepScreenOn 596 * @attr ref android.R.styleable#View_layerType 597 * @attr ref android.R.styleable#View_longClickable 598 * @attr ref android.R.styleable#View_minHeight 599 * @attr ref android.R.styleable#View_minWidth 600 * @attr ref android.R.styleable#View_nextFocusDown 601 * @attr ref android.R.styleable#View_nextFocusLeft 602 * @attr ref android.R.styleable#View_nextFocusRight 603 * @attr ref android.R.styleable#View_nextFocusUp 604 * @attr ref android.R.styleable#View_onClick 605 * @attr ref android.R.styleable#View_padding 606 * @attr ref android.R.styleable#View_paddingBottom 607 * @attr ref android.R.styleable#View_paddingLeft 608 * @attr ref android.R.styleable#View_paddingRight 609 * @attr ref android.R.styleable#View_paddingTop 610 * @attr ref android.R.styleable#View_saveEnabled 611 * @attr ref android.R.styleable#View_rotation 612 * @attr ref android.R.styleable#View_rotationX 613 * @attr ref android.R.styleable#View_rotationY 614 * @attr ref android.R.styleable#View_scaleX 615 * @attr ref android.R.styleable#View_scaleY 616 * @attr ref android.R.styleable#View_scrollX 617 * @attr ref android.R.styleable#View_scrollY 618 * @attr ref android.R.styleable#View_scrollbarSize 619 * @attr ref android.R.styleable#View_scrollbarStyle 620 * @attr ref android.R.styleable#View_scrollbars 621 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 622 * @attr ref android.R.styleable#View_scrollbarFadeDuration 623 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 624 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 625 * @attr ref android.R.styleable#View_scrollbarThumbVertical 626 * @attr ref android.R.styleable#View_scrollbarTrackVertical 627 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 628 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 629 * @attr ref android.R.styleable#View_soundEffectsEnabled 630 * @attr ref android.R.styleable#View_tag 631 * @attr ref android.R.styleable#View_transformPivotX 632 * @attr ref android.R.styleable#View_transformPivotY 633 * @attr ref android.R.styleable#View_translationX 634 * @attr ref android.R.styleable#View_translationY 635 * @attr ref android.R.styleable#View_visibility 636 * 637 * @see android.view.ViewGroup 638 */ 639public class View implements Drawable.Callback2, KeyEvent.Callback, AccessibilityEventSource { 640 private static final boolean DBG = false; 641 642 /** 643 * The logging tag used by this class with android.util.Log. 644 */ 645 protected static final String VIEW_LOG_TAG = "View"; 646 647 /** 648 * Used to mark a View that has no ID. 649 */ 650 public static final int NO_ID = -1; 651 652 /** 653 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 654 * calling setFlags. 655 */ 656 private static final int NOT_FOCUSABLE = 0x00000000; 657 658 /** 659 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 660 * setFlags. 661 */ 662 private static final int FOCUSABLE = 0x00000001; 663 664 /** 665 * Mask for use with setFlags indicating bits used for focus. 666 */ 667 private static final int FOCUSABLE_MASK = 0x00000001; 668 669 /** 670 * This view will adjust its padding to fit sytem windows (e.g. status bar) 671 */ 672 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 673 674 /** 675 * This view is visible. 676 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 677 * android:visibility}. 678 */ 679 public static final int VISIBLE = 0x00000000; 680 681 /** 682 * This view is invisible, but it still takes up space for layout purposes. 683 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 684 * android:visibility}. 685 */ 686 public static final int INVISIBLE = 0x00000004; 687 688 /** 689 * This view is invisible, and it doesn't take any space for layout 690 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 691 * android:visibility}. 692 */ 693 public static final int GONE = 0x00000008; 694 695 /** 696 * Mask for use with setFlags indicating bits used for visibility. 697 * {@hide} 698 */ 699 static final int VISIBILITY_MASK = 0x0000000C; 700 701 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 702 703 /** 704 * This view is enabled. Intrepretation varies by subclass. 705 * Use with ENABLED_MASK when calling setFlags. 706 * {@hide} 707 */ 708 static final int ENABLED = 0x00000000; 709 710 /** 711 * This view is disabled. Intrepretation varies by subclass. 712 * Use with ENABLED_MASK when calling setFlags. 713 * {@hide} 714 */ 715 static final int DISABLED = 0x00000020; 716 717 /** 718 * Mask for use with setFlags indicating bits used for indicating whether 719 * this view is enabled 720 * {@hide} 721 */ 722 static final int ENABLED_MASK = 0x00000020; 723 724 /** 725 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 726 * called and further optimizations will be performed. It is okay to have 727 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 728 * {@hide} 729 */ 730 static final int WILL_NOT_DRAW = 0x00000080; 731 732 /** 733 * Mask for use with setFlags indicating bits used for indicating whether 734 * this view is will draw 735 * {@hide} 736 */ 737 static final int DRAW_MASK = 0x00000080; 738 739 /** 740 * <p>This view doesn't show scrollbars.</p> 741 * {@hide} 742 */ 743 static final int SCROLLBARS_NONE = 0x00000000; 744 745 /** 746 * <p>This view shows horizontal scrollbars.</p> 747 * {@hide} 748 */ 749 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 750 751 /** 752 * <p>This view shows vertical scrollbars.</p> 753 * {@hide} 754 */ 755 static final int SCROLLBARS_VERTICAL = 0x00000200; 756 757 /** 758 * <p>Mask for use with setFlags indicating bits used for indicating which 759 * scrollbars are enabled.</p> 760 * {@hide} 761 */ 762 static final int SCROLLBARS_MASK = 0x00000300; 763 764 /** 765 * Indicates that the view should filter touches when its window is obscured. 766 * Refer to the class comments for more information about this security feature. 767 * {@hide} 768 */ 769 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 770 771 // note flag value 0x00000800 is now available for next flags... 772 773 /** 774 * <p>This view doesn't show fading edges.</p> 775 * {@hide} 776 */ 777 static final int FADING_EDGE_NONE = 0x00000000; 778 779 /** 780 * <p>This view shows horizontal fading edges.</p> 781 * {@hide} 782 */ 783 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 784 785 /** 786 * <p>This view shows vertical fading edges.</p> 787 * {@hide} 788 */ 789 static final int FADING_EDGE_VERTICAL = 0x00002000; 790 791 /** 792 * <p>Mask for use with setFlags indicating bits used for indicating which 793 * fading edges are enabled.</p> 794 * {@hide} 795 */ 796 static final int FADING_EDGE_MASK = 0x00003000; 797 798 /** 799 * <p>Indicates this view can be clicked. When clickable, a View reacts 800 * to clicks by notifying the OnClickListener.<p> 801 * {@hide} 802 */ 803 static final int CLICKABLE = 0x00004000; 804 805 /** 806 * <p>Indicates this view is caching its drawing into a bitmap.</p> 807 * {@hide} 808 */ 809 static final int DRAWING_CACHE_ENABLED = 0x00008000; 810 811 /** 812 * <p>Indicates that no icicle should be saved for this view.<p> 813 * {@hide} 814 */ 815 static final int SAVE_DISABLED = 0x000010000; 816 817 /** 818 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 819 * property.</p> 820 * {@hide} 821 */ 822 static final int SAVE_DISABLED_MASK = 0x000010000; 823 824 /** 825 * <p>Indicates that no drawing cache should ever be created for this view.<p> 826 * {@hide} 827 */ 828 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 829 830 /** 831 * <p>Indicates this view can take / keep focus when int touch mode.</p> 832 * {@hide} 833 */ 834 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 835 836 /** 837 * <p>Enables low quality mode for the drawing cache.</p> 838 */ 839 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 840 841 /** 842 * <p>Enables high quality mode for the drawing cache.</p> 843 */ 844 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 845 846 /** 847 * <p>Enables automatic quality mode for the drawing cache.</p> 848 */ 849 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 850 851 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 852 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 853 }; 854 855 /** 856 * <p>Mask for use with setFlags indicating bits used for the cache 857 * quality property.</p> 858 * {@hide} 859 */ 860 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 861 862 /** 863 * <p> 864 * Indicates this view can be long clicked. When long clickable, a View 865 * reacts to long clicks by notifying the OnLongClickListener or showing a 866 * context menu. 867 * </p> 868 * {@hide} 869 */ 870 static final int LONG_CLICKABLE = 0x00200000; 871 872 /** 873 * <p>Indicates that this view gets its drawable states from its direct parent 874 * and ignores its original internal states.</p> 875 * 876 * @hide 877 */ 878 static final int DUPLICATE_PARENT_STATE = 0x00400000; 879 880 /** 881 * The scrollbar style to display the scrollbars inside the content area, 882 * without increasing the padding. The scrollbars will be overlaid with 883 * translucency on the view's content. 884 */ 885 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 886 887 /** 888 * The scrollbar style to display the scrollbars inside the padded area, 889 * increasing the padding of the view. The scrollbars will not overlap the 890 * content area of the view. 891 */ 892 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 893 894 /** 895 * The scrollbar style to display the scrollbars at the edge of the view, 896 * without increasing the padding. The scrollbars will be overlaid with 897 * translucency. 898 */ 899 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 900 901 /** 902 * The scrollbar style to display the scrollbars at the edge of the view, 903 * increasing the padding of the view. The scrollbars will only overlap the 904 * background, if any. 905 */ 906 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 907 908 /** 909 * Mask to check if the scrollbar style is overlay or inset. 910 * {@hide} 911 */ 912 static final int SCROLLBARS_INSET_MASK = 0x01000000; 913 914 /** 915 * Mask to check if the scrollbar style is inside or outside. 916 * {@hide} 917 */ 918 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 919 920 /** 921 * Mask for scrollbar style. 922 * {@hide} 923 */ 924 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 925 926 /** 927 * View flag indicating that the screen should remain on while the 928 * window containing this view is visible to the user. This effectively 929 * takes care of automatically setting the WindowManager's 930 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 931 */ 932 public static final int KEEP_SCREEN_ON = 0x04000000; 933 934 /** 935 * View flag indicating whether this view should have sound effects enabled 936 * for events such as clicking and touching. 937 */ 938 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 939 940 /** 941 * View flag indicating whether this view should have haptic feedback 942 * enabled for events such as long presses. 943 */ 944 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 945 946 /** 947 * <p>Indicates that the view hierarchy should stop saving state when 948 * it reaches this view. If state saving is initiated immediately at 949 * the view, it will be allowed. 950 * {@hide} 951 */ 952 static final int PARENT_SAVE_DISABLED = 0x20000000; 953 954 /** 955 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 956 * {@hide} 957 */ 958 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 959 960 /** 961 * Horizontal direction of this view is from Left to Right. 962 * Use with {@link #setLayoutDirection}. 963 * {@hide} 964 */ 965 public static final int LAYOUT_DIRECTION_LTR = 0x00000000; 966 967 /** 968 * Horizontal direction of this view is from Right to Left. 969 * Use with {@link #setLayoutDirection}. 970 * {@hide} 971 */ 972 public static final int LAYOUT_DIRECTION_RTL = 0x40000000; 973 974 /** 975 * Horizontal direction of this view is inherited from its parent. 976 * Use with {@link #setLayoutDirection}. 977 * {@hide} 978 */ 979 public static final int LAYOUT_DIRECTION_INHERIT = 0x80000000; 980 981 /** 982 * Horizontal direction of this view is from deduced from the default language 983 * script for the locale. Use with {@link #setLayoutDirection}. 984 * {@hide} 985 */ 986 public static final int LAYOUT_DIRECTION_LOCALE = 0xC0000000; 987 988 /** 989 * Mask for use with setFlags indicating bits used for horizontalDirection. 990 * {@hide} 991 */ 992 static final int LAYOUT_DIRECTION_MASK = 0xC0000000; 993 994 /* 995 * Array of horizontal direction flags for mapping attribute "horizontalDirection" to correct 996 * flag value. 997 * {@hide} 998 */ 999 private static final int[] LAYOUT_DIRECTION_FLAGS = {LAYOUT_DIRECTION_LTR, 1000 LAYOUT_DIRECTION_RTL, LAYOUT_DIRECTION_INHERIT, LAYOUT_DIRECTION_LOCALE}; 1001 1002 /** 1003 * Default horizontalDirection. 1004 * {@hide} 1005 */ 1006 private static final int LAYOUT_DIRECTION_DEFAULT = LAYOUT_DIRECTION_INHERIT; 1007 1008 /** 1009 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1010 * should add all focusable Views regardless if they are focusable in touch mode. 1011 */ 1012 public static final int FOCUSABLES_ALL = 0x00000000; 1013 1014 /** 1015 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1016 * should add only Views focusable in touch mode. 1017 */ 1018 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1019 1020 /** 1021 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1022 * item. 1023 */ 1024 public static final int FOCUS_BACKWARD = 0x00000001; 1025 1026 /** 1027 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1028 * item. 1029 */ 1030 public static final int FOCUS_FORWARD = 0x00000002; 1031 1032 /** 1033 * Use with {@link #focusSearch(int)}. Move focus to the left. 1034 */ 1035 public static final int FOCUS_LEFT = 0x00000011; 1036 1037 /** 1038 * Use with {@link #focusSearch(int)}. Move focus up. 1039 */ 1040 public static final int FOCUS_UP = 0x00000021; 1041 1042 /** 1043 * Use with {@link #focusSearch(int)}. Move focus to the right. 1044 */ 1045 public static final int FOCUS_RIGHT = 0x00000042; 1046 1047 /** 1048 * Use with {@link #focusSearch(int)}. Move focus down. 1049 */ 1050 public static final int FOCUS_DOWN = 0x00000082; 1051 1052 /** 1053 * Bits of {@link #getMeasuredWidthAndState()} and 1054 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1055 */ 1056 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1057 1058 /** 1059 * Bits of {@link #getMeasuredWidthAndState()} and 1060 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1061 */ 1062 public static final int MEASURED_STATE_MASK = 0xff000000; 1063 1064 /** 1065 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1066 * for functions that combine both width and height into a single int, 1067 * such as {@link #getMeasuredState()} and the childState argument of 1068 * {@link #resolveSizeAndState(int, int, int)}. 1069 */ 1070 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1071 1072 /** 1073 * Bit of {@link #getMeasuredWidthAndState()} and 1074 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1075 * is smaller that the space the view would like to have. 1076 */ 1077 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1078 1079 /** 1080 * Base View state sets 1081 */ 1082 // Singles 1083 /** 1084 * Indicates the view has no states set. States are used with 1085 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1086 * view depending on its state. 1087 * 1088 * @see android.graphics.drawable.Drawable 1089 * @see #getDrawableState() 1090 */ 1091 protected static final int[] EMPTY_STATE_SET; 1092 /** 1093 * Indicates the view is enabled. States are used with 1094 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1095 * view depending on its state. 1096 * 1097 * @see android.graphics.drawable.Drawable 1098 * @see #getDrawableState() 1099 */ 1100 protected static final int[] ENABLED_STATE_SET; 1101 /** 1102 * Indicates the view is focused. States are used with 1103 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1104 * view depending on its state. 1105 * 1106 * @see android.graphics.drawable.Drawable 1107 * @see #getDrawableState() 1108 */ 1109 protected static final int[] FOCUSED_STATE_SET; 1110 /** 1111 * Indicates the view is selected. States are used with 1112 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1113 * view depending on its state. 1114 * 1115 * @see android.graphics.drawable.Drawable 1116 * @see #getDrawableState() 1117 */ 1118 protected static final int[] SELECTED_STATE_SET; 1119 /** 1120 * Indicates the view is pressed. States are used with 1121 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1122 * view depending on its state. 1123 * 1124 * @see android.graphics.drawable.Drawable 1125 * @see #getDrawableState() 1126 * @hide 1127 */ 1128 protected static final int[] PRESSED_STATE_SET; 1129 /** 1130 * Indicates the view's window has focus. States are used with 1131 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1132 * view depending on its state. 1133 * 1134 * @see android.graphics.drawable.Drawable 1135 * @see #getDrawableState() 1136 */ 1137 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1138 // Doubles 1139 /** 1140 * Indicates the view is enabled and has the focus. 1141 * 1142 * @see #ENABLED_STATE_SET 1143 * @see #FOCUSED_STATE_SET 1144 */ 1145 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1146 /** 1147 * Indicates the view is enabled and selected. 1148 * 1149 * @see #ENABLED_STATE_SET 1150 * @see #SELECTED_STATE_SET 1151 */ 1152 protected static final int[] ENABLED_SELECTED_STATE_SET; 1153 /** 1154 * Indicates the view is enabled and that its window has focus. 1155 * 1156 * @see #ENABLED_STATE_SET 1157 * @see #WINDOW_FOCUSED_STATE_SET 1158 */ 1159 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1160 /** 1161 * Indicates the view is focused and selected. 1162 * 1163 * @see #FOCUSED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 */ 1166 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1167 /** 1168 * Indicates the view has the focus and that its window has the focus. 1169 * 1170 * @see #FOCUSED_STATE_SET 1171 * @see #WINDOW_FOCUSED_STATE_SET 1172 */ 1173 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1174 /** 1175 * Indicates the view is selected and that its window has the focus. 1176 * 1177 * @see #SELECTED_STATE_SET 1178 * @see #WINDOW_FOCUSED_STATE_SET 1179 */ 1180 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1181 // Triples 1182 /** 1183 * Indicates the view is enabled, focused and selected. 1184 * 1185 * @see #ENABLED_STATE_SET 1186 * @see #FOCUSED_STATE_SET 1187 * @see #SELECTED_STATE_SET 1188 */ 1189 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1190 /** 1191 * Indicates the view is enabled, focused and its window has the focus. 1192 * 1193 * @see #ENABLED_STATE_SET 1194 * @see #FOCUSED_STATE_SET 1195 * @see #WINDOW_FOCUSED_STATE_SET 1196 */ 1197 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1198 /** 1199 * Indicates the view is enabled, selected and its window has the focus. 1200 * 1201 * @see #ENABLED_STATE_SET 1202 * @see #SELECTED_STATE_SET 1203 * @see #WINDOW_FOCUSED_STATE_SET 1204 */ 1205 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1206 /** 1207 * Indicates the view is focused, selected and its window has the focus. 1208 * 1209 * @see #FOCUSED_STATE_SET 1210 * @see #SELECTED_STATE_SET 1211 * @see #WINDOW_FOCUSED_STATE_SET 1212 */ 1213 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1214 /** 1215 * Indicates the view is enabled, focused, selected and its window 1216 * has the focus. 1217 * 1218 * @see #ENABLED_STATE_SET 1219 * @see #FOCUSED_STATE_SET 1220 * @see #SELECTED_STATE_SET 1221 * @see #WINDOW_FOCUSED_STATE_SET 1222 */ 1223 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1224 /** 1225 * Indicates the view is pressed and its window has the focus. 1226 * 1227 * @see #PRESSED_STATE_SET 1228 * @see #WINDOW_FOCUSED_STATE_SET 1229 */ 1230 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1231 /** 1232 * Indicates the view is pressed and selected. 1233 * 1234 * @see #PRESSED_STATE_SET 1235 * @see #SELECTED_STATE_SET 1236 */ 1237 protected static final int[] PRESSED_SELECTED_STATE_SET; 1238 /** 1239 * Indicates the view is pressed, selected and its window has the focus. 1240 * 1241 * @see #PRESSED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 * @see #WINDOW_FOCUSED_STATE_SET 1244 */ 1245 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1246 /** 1247 * Indicates the view is pressed and focused. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #FOCUSED_STATE_SET 1251 */ 1252 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1253 /** 1254 * Indicates the view is pressed, focused and its window has the focus. 1255 * 1256 * @see #PRESSED_STATE_SET 1257 * @see #FOCUSED_STATE_SET 1258 * @see #WINDOW_FOCUSED_STATE_SET 1259 */ 1260 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1261 /** 1262 * Indicates the view is pressed, focused and selected. 1263 * 1264 * @see #PRESSED_STATE_SET 1265 * @see #SELECTED_STATE_SET 1266 * @see #FOCUSED_STATE_SET 1267 */ 1268 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1269 /** 1270 * Indicates the view is pressed, focused, selected and its window has the focus. 1271 * 1272 * @see #PRESSED_STATE_SET 1273 * @see #FOCUSED_STATE_SET 1274 * @see #SELECTED_STATE_SET 1275 * @see #WINDOW_FOCUSED_STATE_SET 1276 */ 1277 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1278 /** 1279 * Indicates the view is pressed and enabled. 1280 * 1281 * @see #PRESSED_STATE_SET 1282 * @see #ENABLED_STATE_SET 1283 */ 1284 protected static final int[] PRESSED_ENABLED_STATE_SET; 1285 /** 1286 * Indicates the view is pressed, enabled and its window has the focus. 1287 * 1288 * @see #PRESSED_STATE_SET 1289 * @see #ENABLED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1293 /** 1294 * Indicates the view is pressed, enabled and selected. 1295 * 1296 * @see #PRESSED_STATE_SET 1297 * @see #ENABLED_STATE_SET 1298 * @see #SELECTED_STATE_SET 1299 */ 1300 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1301 /** 1302 * Indicates the view is pressed, enabled, selected and its window has the 1303 * focus. 1304 * 1305 * @see #PRESSED_STATE_SET 1306 * @see #ENABLED_STATE_SET 1307 * @see #SELECTED_STATE_SET 1308 * @see #WINDOW_FOCUSED_STATE_SET 1309 */ 1310 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1311 /** 1312 * Indicates the view is pressed, enabled and focused. 1313 * 1314 * @see #PRESSED_STATE_SET 1315 * @see #ENABLED_STATE_SET 1316 * @see #FOCUSED_STATE_SET 1317 */ 1318 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1319 /** 1320 * Indicates the view is pressed, enabled, focused and its window has the 1321 * focus. 1322 * 1323 * @see #PRESSED_STATE_SET 1324 * @see #ENABLED_STATE_SET 1325 * @see #FOCUSED_STATE_SET 1326 * @see #WINDOW_FOCUSED_STATE_SET 1327 */ 1328 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1329 /** 1330 * Indicates the view is pressed, enabled, focused and selected. 1331 * 1332 * @see #PRESSED_STATE_SET 1333 * @see #ENABLED_STATE_SET 1334 * @see #SELECTED_STATE_SET 1335 * @see #FOCUSED_STATE_SET 1336 */ 1337 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1338 /** 1339 * Indicates the view is pressed, enabled, focused, selected and its window 1340 * has the focus. 1341 * 1342 * @see #PRESSED_STATE_SET 1343 * @see #ENABLED_STATE_SET 1344 * @see #SELECTED_STATE_SET 1345 * @see #FOCUSED_STATE_SET 1346 * @see #WINDOW_FOCUSED_STATE_SET 1347 */ 1348 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1349 1350 /** 1351 * The order here is very important to {@link #getDrawableState()} 1352 */ 1353 private static final int[][] VIEW_STATE_SETS; 1354 1355 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1356 static final int VIEW_STATE_SELECTED = 1 << 1; 1357 static final int VIEW_STATE_FOCUSED = 1 << 2; 1358 static final int VIEW_STATE_ENABLED = 1 << 3; 1359 static final int VIEW_STATE_PRESSED = 1 << 4; 1360 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1361 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1362 static final int VIEW_STATE_HOVERED = 1 << 7; 1363 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1364 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1365 1366 static final int[] VIEW_STATE_IDS = new int[] { 1367 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1368 R.attr.state_selected, VIEW_STATE_SELECTED, 1369 R.attr.state_focused, VIEW_STATE_FOCUSED, 1370 R.attr.state_enabled, VIEW_STATE_ENABLED, 1371 R.attr.state_pressed, VIEW_STATE_PRESSED, 1372 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1373 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1374 R.attr.state_hovered, VIEW_STATE_HOVERED, 1375 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1376 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED, 1377 }; 1378 1379 static { 1380 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1381 throw new IllegalStateException( 1382 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1383 } 1384 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1385 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1386 int viewState = R.styleable.ViewDrawableStates[i]; 1387 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1388 if (VIEW_STATE_IDS[j] == viewState) { 1389 orderedIds[i * 2] = viewState; 1390 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1391 } 1392 } 1393 } 1394 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1395 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1396 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1397 int numBits = Integer.bitCount(i); 1398 int[] set = new int[numBits]; 1399 int pos = 0; 1400 for (int j = 0; j < orderedIds.length; j += 2) { 1401 if ((i & orderedIds[j+1]) != 0) { 1402 set[pos++] = orderedIds[j]; 1403 } 1404 } 1405 VIEW_STATE_SETS[i] = set; 1406 } 1407 1408 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1409 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1410 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1411 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1412 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1413 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1414 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1415 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1416 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1418 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_FOCUSED]; 1421 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1422 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1423 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1424 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1425 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1426 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1427 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1428 | VIEW_STATE_ENABLED]; 1429 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1430 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1431 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1432 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1433 | VIEW_STATE_ENABLED]; 1434 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1435 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1436 | VIEW_STATE_ENABLED]; 1437 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1438 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1439 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1440 1441 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1442 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1443 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1444 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1445 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1446 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1448 | VIEW_STATE_PRESSED]; 1449 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1450 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1451 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1452 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1453 | VIEW_STATE_PRESSED]; 1454 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1456 | VIEW_STATE_PRESSED]; 1457 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1458 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1459 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1460 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1461 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1462 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1463 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1464 | VIEW_STATE_PRESSED]; 1465 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1466 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1467 | VIEW_STATE_PRESSED]; 1468 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1469 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1470 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1471 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1472 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1473 | VIEW_STATE_PRESSED]; 1474 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1476 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1477 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1478 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1479 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1480 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1481 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1482 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1483 | VIEW_STATE_PRESSED]; 1484 } 1485 1486 /** 1487 * Temporary Rect currently for use in setBackground(). This will probably 1488 * be extended in the future to hold our own class with more than just 1489 * a Rect. :) 1490 */ 1491 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1492 1493 /** 1494 * Map used to store views' tags. 1495 */ 1496 private static WeakHashMap<View, SparseArray<Object>> sTags; 1497 1498 /** 1499 * Lock used to access sTags. 1500 */ 1501 private static final Object sTagsLock = new Object(); 1502 1503 /** 1504 * The next available accessiiblity id. 1505 */ 1506 private static int sNextAccessibilityViewId; 1507 1508 /** 1509 * The animation currently associated with this view. 1510 * @hide 1511 */ 1512 protected Animation mCurrentAnimation = null; 1513 1514 /** 1515 * Width as measured during measure pass. 1516 * {@hide} 1517 */ 1518 @ViewDebug.ExportedProperty(category = "measurement") 1519 int mMeasuredWidth; 1520 1521 /** 1522 * Height as measured during measure pass. 1523 * {@hide} 1524 */ 1525 @ViewDebug.ExportedProperty(category = "measurement") 1526 int mMeasuredHeight; 1527 1528 /** 1529 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1530 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1531 * its display list. This flag, used only when hw accelerated, allows us to clear the 1532 * flag while retaining this information until it's needed (at getDisplayList() time and 1533 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1534 * 1535 * {@hide} 1536 */ 1537 boolean mRecreateDisplayList = false; 1538 1539 /** 1540 * The view's identifier. 1541 * {@hide} 1542 * 1543 * @see #setId(int) 1544 * @see #getId() 1545 */ 1546 @ViewDebug.ExportedProperty(resolveId = true) 1547 int mID = NO_ID; 1548 1549 /** 1550 * The stable ID of this view for accessibility porposes. 1551 */ 1552 int mAccessibilityViewId = NO_ID; 1553 1554 /** 1555 * The view's tag. 1556 * {@hide} 1557 * 1558 * @see #setTag(Object) 1559 * @see #getTag() 1560 */ 1561 protected Object mTag; 1562 1563 // for mPrivateFlags: 1564 /** {@hide} */ 1565 static final int WANTS_FOCUS = 0x00000001; 1566 /** {@hide} */ 1567 static final int FOCUSED = 0x00000002; 1568 /** {@hide} */ 1569 static final int SELECTED = 0x00000004; 1570 /** {@hide} */ 1571 static final int IS_ROOT_NAMESPACE = 0x00000008; 1572 /** {@hide} */ 1573 static final int HAS_BOUNDS = 0x00000010; 1574 /** {@hide} */ 1575 static final int DRAWN = 0x00000020; 1576 /** 1577 * When this flag is set, this view is running an animation on behalf of its 1578 * children and should therefore not cancel invalidate requests, even if they 1579 * lie outside of this view's bounds. 1580 * 1581 * {@hide} 1582 */ 1583 static final int DRAW_ANIMATION = 0x00000040; 1584 /** {@hide} */ 1585 static final int SKIP_DRAW = 0x00000080; 1586 /** {@hide} */ 1587 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1588 /** {@hide} */ 1589 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1590 /** {@hide} */ 1591 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1592 /** {@hide} */ 1593 static final int MEASURED_DIMENSION_SET = 0x00000800; 1594 /** {@hide} */ 1595 static final int FORCE_LAYOUT = 0x00001000; 1596 /** {@hide} */ 1597 static final int LAYOUT_REQUIRED = 0x00002000; 1598 1599 private static final int PRESSED = 0x00004000; 1600 1601 /** {@hide} */ 1602 static final int DRAWING_CACHE_VALID = 0x00008000; 1603 /** 1604 * Flag used to indicate that this view should be drawn once more (and only once 1605 * more) after its animation has completed. 1606 * {@hide} 1607 */ 1608 static final int ANIMATION_STARTED = 0x00010000; 1609 1610 private static final int SAVE_STATE_CALLED = 0x00020000; 1611 1612 /** 1613 * Indicates that the View returned true when onSetAlpha() was called and that 1614 * the alpha must be restored. 1615 * {@hide} 1616 */ 1617 static final int ALPHA_SET = 0x00040000; 1618 1619 /** 1620 * Set by {@link #setScrollContainer(boolean)}. 1621 */ 1622 static final int SCROLL_CONTAINER = 0x00080000; 1623 1624 /** 1625 * Set by {@link #setScrollContainer(boolean)}. 1626 */ 1627 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1628 1629 /** 1630 * View flag indicating whether this view was invalidated (fully or partially.) 1631 * 1632 * @hide 1633 */ 1634 static final int DIRTY = 0x00200000; 1635 1636 /** 1637 * View flag indicating whether this view was invalidated by an opaque 1638 * invalidate request. 1639 * 1640 * @hide 1641 */ 1642 static final int DIRTY_OPAQUE = 0x00400000; 1643 1644 /** 1645 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1646 * 1647 * @hide 1648 */ 1649 static final int DIRTY_MASK = 0x00600000; 1650 1651 /** 1652 * Indicates whether the background is opaque. 1653 * 1654 * @hide 1655 */ 1656 static final int OPAQUE_BACKGROUND = 0x00800000; 1657 1658 /** 1659 * Indicates whether the scrollbars are opaque. 1660 * 1661 * @hide 1662 */ 1663 static final int OPAQUE_SCROLLBARS = 0x01000000; 1664 1665 /** 1666 * Indicates whether the view is opaque. 1667 * 1668 * @hide 1669 */ 1670 static final int OPAQUE_MASK = 0x01800000; 1671 1672 /** 1673 * Indicates a prepressed state; 1674 * the short time between ACTION_DOWN and recognizing 1675 * a 'real' press. Prepressed is used to recognize quick taps 1676 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1677 * 1678 * @hide 1679 */ 1680 private static final int PREPRESSED = 0x02000000; 1681 1682 /** 1683 * Indicates whether the view is temporarily detached. 1684 * 1685 * @hide 1686 */ 1687 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1688 1689 /** 1690 * Indicates that we should awaken scroll bars once attached 1691 * 1692 * @hide 1693 */ 1694 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1695 1696 /** 1697 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1698 * @hide 1699 */ 1700 private static final int HOVERED = 0x10000000; 1701 1702 /** 1703 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1704 * for transform operations 1705 * 1706 * @hide 1707 */ 1708 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1709 1710 /** {@hide} */ 1711 static final int ACTIVATED = 0x40000000; 1712 1713 /** 1714 * Indicates that this view was specifically invalidated, not just dirtied because some 1715 * child view was invalidated. The flag is used to determine when we need to recreate 1716 * a view's display list (as opposed to just returning a reference to its existing 1717 * display list). 1718 * 1719 * @hide 1720 */ 1721 static final int INVALIDATED = 0x80000000; 1722 1723 /* Masks for mPrivateFlags2 */ 1724 1725 /** 1726 * Indicates that this view has reported that it can accept the current drag's content. 1727 * Cleared when the drag operation concludes. 1728 * @hide 1729 */ 1730 static final int DRAG_CAN_ACCEPT = 0x00000001; 1731 1732 /** 1733 * Indicates that this view is currently directly under the drag location in a 1734 * drag-and-drop operation involving content that it can accept. Cleared when 1735 * the drag exits the view, or when the drag operation concludes. 1736 * @hide 1737 */ 1738 static final int DRAG_HOVERED = 0x00000002; 1739 1740 /** 1741 * Indicates whether the view layout direction has been resolved and drawn to the 1742 * right-to-left direction. 1743 * 1744 * @hide 1745 */ 1746 static final int LAYOUT_DIRECTION_RESOLVED_RTL = 0x00000004; 1747 1748 /** 1749 * Indicates whether the view layout direction has been resolved. 1750 * 1751 * @hide 1752 */ 1753 static final int LAYOUT_DIRECTION_RESOLVED = 0x00000008; 1754 1755 1756 /* End of masks for mPrivateFlags2 */ 1757 1758 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 1759 1760 /** 1761 * Always allow a user to over-scroll this view, provided it is a 1762 * view that can scroll. 1763 * 1764 * @see #getOverScrollMode() 1765 * @see #setOverScrollMode(int) 1766 */ 1767 public static final int OVER_SCROLL_ALWAYS = 0; 1768 1769 /** 1770 * Allow a user to over-scroll this view only if the content is large 1771 * enough to meaningfully scroll, provided it is a view that can scroll. 1772 * 1773 * @see #getOverScrollMode() 1774 * @see #setOverScrollMode(int) 1775 */ 1776 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1777 1778 /** 1779 * Never allow a user to over-scroll this view. 1780 * 1781 * @see #getOverScrollMode() 1782 * @see #setOverScrollMode(int) 1783 */ 1784 public static final int OVER_SCROLL_NEVER = 2; 1785 1786 /** 1787 * View has requested the system UI (status bar) to be visible (the default). 1788 * 1789 * @see #setSystemUiVisibility(int) 1790 */ 1791 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 1792 1793 /** 1794 * View has requested the system UI to enter an unobtrusive "low profile" mode. 1795 * 1796 * This is for use in games, book readers, video players, or any other "immersive" application 1797 * where the usual system chrome is deemed too distracting. 1798 * 1799 * In low profile mode, the status bar and/or navigation icons may dim. 1800 * 1801 * @see #setSystemUiVisibility(int) 1802 */ 1803 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 1804 1805 /** 1806 * View has requested that the system navigation be temporarily hidden. 1807 * 1808 * This is an even less obtrusive state than that called for by 1809 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 1810 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 1811 * those to disappear. This is useful (in conjunction with the 1812 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 1813 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 1814 * window flags) for displaying content using every last pixel on the display. 1815 * 1816 * There is a limitation: because navigation controls are so important, the least user 1817 * interaction will cause them to reappear immediately. 1818 * 1819 * @see #setSystemUiVisibility(int) 1820 */ 1821 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 1822 1823 /** 1824 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 1825 */ 1826 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 1827 1828 /** 1829 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 1830 */ 1831 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 1832 1833 /** 1834 * @hide 1835 * 1836 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1837 * out of the public fields to keep the undefined bits out of the developer's way. 1838 * 1839 * Flag to make the status bar not expandable. Unless you also 1840 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1841 */ 1842 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1843 1844 /** 1845 * @hide 1846 * 1847 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1848 * out of the public fields to keep the undefined bits out of the developer's way. 1849 * 1850 * Flag to hide notification icons and scrolling ticker text. 1851 */ 1852 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1853 1854 /** 1855 * @hide 1856 * 1857 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1858 * out of the public fields to keep the undefined bits out of the developer's way. 1859 * 1860 * Flag to disable incoming notification alerts. This will not block 1861 * icons, but it will block sound, vibrating and other visual or aural notifications. 1862 */ 1863 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1864 1865 /** 1866 * @hide 1867 * 1868 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1869 * out of the public fields to keep the undefined bits out of the developer's way. 1870 * 1871 * Flag to hide only the scrolling ticker. Note that 1872 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1873 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1874 */ 1875 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1876 1877 /** 1878 * @hide 1879 * 1880 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1881 * out of the public fields to keep the undefined bits out of the developer's way. 1882 * 1883 * Flag to hide the center system info area. 1884 */ 1885 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1886 1887 /** 1888 * @hide 1889 * 1890 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1891 * out of the public fields to keep the undefined bits out of the developer's way. 1892 * 1893 * Flag to hide only the navigation buttons. Don't use this 1894 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1895 * 1896 * THIS DOES NOT DISABLE THE BACK BUTTON 1897 */ 1898 public static final int STATUS_BAR_DISABLE_NAVIGATION = 0x00200000; 1899 1900 /** 1901 * @hide 1902 * 1903 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1904 * out of the public fields to keep the undefined bits out of the developer's way. 1905 * 1906 * Flag to hide only the back button. Don't use this 1907 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1908 */ 1909 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1910 1911 /** 1912 * @hide 1913 * 1914 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1915 * out of the public fields to keep the undefined bits out of the developer's way. 1916 * 1917 * Flag to hide only the clock. You might use this if your activity has 1918 * its own clock making the status bar's clock redundant. 1919 */ 1920 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1921 1922 /** 1923 * @hide 1924 */ 1925 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 1926 1927 /** 1928 * Controls the over-scroll mode for this view. 1929 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1930 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1931 * and {@link #OVER_SCROLL_NEVER}. 1932 */ 1933 private int mOverScrollMode; 1934 1935 /** 1936 * The parent this view is attached to. 1937 * {@hide} 1938 * 1939 * @see #getParent() 1940 */ 1941 protected ViewParent mParent; 1942 1943 /** 1944 * {@hide} 1945 */ 1946 AttachInfo mAttachInfo; 1947 1948 /** 1949 * {@hide} 1950 */ 1951 @ViewDebug.ExportedProperty(flagMapping = { 1952 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1953 name = "FORCE_LAYOUT"), 1954 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1955 name = "LAYOUT_REQUIRED"), 1956 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1957 name = "DRAWING_CACHE_INVALID", outputIf = false), 1958 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1959 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1960 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1961 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1962 }) 1963 int mPrivateFlags; 1964 int mPrivateFlags2; 1965 1966 /** 1967 * This view's request for the visibility of the status bar. 1968 * @hide 1969 */ 1970 @ViewDebug.ExportedProperty(flagMapping = { 1971 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 1972 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 1973 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 1974 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 1975 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 1976 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 1977 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 1978 equals = SYSTEM_UI_FLAG_VISIBLE, 1979 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 1980 }) 1981 int mSystemUiVisibility; 1982 1983 /** 1984 * Count of how many windows this view has been attached to. 1985 */ 1986 int mWindowAttachCount; 1987 1988 /** 1989 * The layout parameters associated with this view and used by the parent 1990 * {@link android.view.ViewGroup} to determine how this view should be 1991 * laid out. 1992 * {@hide} 1993 */ 1994 protected ViewGroup.LayoutParams mLayoutParams; 1995 1996 /** 1997 * The view flags hold various views states. 1998 * {@hide} 1999 */ 2000 @ViewDebug.ExportedProperty 2001 int mViewFlags; 2002 2003 /** 2004 * The transform matrix for the View. This transform is calculated internally 2005 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2006 * is used by default. Do *not* use this variable directly; instead call 2007 * getMatrix(), which will automatically recalculate the matrix if necessary 2008 * to get the correct matrix based on the latest rotation and scale properties. 2009 */ 2010 private final Matrix mMatrix = new Matrix(); 2011 2012 /** 2013 * The transform matrix for the View. This transform is calculated internally 2014 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2015 * is used by default. Do *not* use this variable directly; instead call 2016 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2017 * to get the correct matrix based on the latest rotation and scale properties. 2018 */ 2019 private Matrix mInverseMatrix; 2020 2021 /** 2022 * An internal variable that tracks whether we need to recalculate the 2023 * transform matrix, based on whether the rotation or scaleX/Y properties 2024 * have changed since the matrix was last calculated. 2025 */ 2026 boolean mMatrixDirty = false; 2027 2028 /** 2029 * An internal variable that tracks whether we need to recalculate the 2030 * transform matrix, based on whether the rotation or scaleX/Y properties 2031 * have changed since the matrix was last calculated. 2032 */ 2033 private boolean mInverseMatrixDirty = true; 2034 2035 /** 2036 * A variable that tracks whether we need to recalculate the 2037 * transform matrix, based on whether the rotation or scaleX/Y properties 2038 * have changed since the matrix was last calculated. This variable 2039 * is only valid after a call to updateMatrix() or to a function that 2040 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2041 */ 2042 private boolean mMatrixIsIdentity = true; 2043 2044 /** 2045 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2046 */ 2047 private Camera mCamera = null; 2048 2049 /** 2050 * This matrix is used when computing the matrix for 3D rotations. 2051 */ 2052 private Matrix matrix3D = null; 2053 2054 /** 2055 * These prev values are used to recalculate a centered pivot point when necessary. The 2056 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2057 * set), so thes values are only used then as well. 2058 */ 2059 private int mPrevWidth = -1; 2060 private int mPrevHeight = -1; 2061 2062 private boolean mLastIsOpaque; 2063 2064 /** 2065 * Convenience value to check for float values that are close enough to zero to be considered 2066 * zero. 2067 */ 2068 private static final float NONZERO_EPSILON = .001f; 2069 2070 /** 2071 * The degrees rotation around the vertical axis through the pivot point. 2072 */ 2073 @ViewDebug.ExportedProperty 2074 float mRotationY = 0f; 2075 2076 /** 2077 * The degrees rotation around the horizontal axis through the pivot point. 2078 */ 2079 @ViewDebug.ExportedProperty 2080 float mRotationX = 0f; 2081 2082 /** 2083 * The degrees rotation around the pivot point. 2084 */ 2085 @ViewDebug.ExportedProperty 2086 float mRotation = 0f; 2087 2088 /** 2089 * The amount of translation of the object away from its left property (post-layout). 2090 */ 2091 @ViewDebug.ExportedProperty 2092 float mTranslationX = 0f; 2093 2094 /** 2095 * The amount of translation of the object away from its top property (post-layout). 2096 */ 2097 @ViewDebug.ExportedProperty 2098 float mTranslationY = 0f; 2099 2100 /** 2101 * The amount of scale in the x direction around the pivot point. A 2102 * value of 1 means no scaling is applied. 2103 */ 2104 @ViewDebug.ExportedProperty 2105 float mScaleX = 1f; 2106 2107 /** 2108 * The amount of scale in the y direction around the pivot point. A 2109 * value of 1 means no scaling is applied. 2110 */ 2111 @ViewDebug.ExportedProperty 2112 float mScaleY = 1f; 2113 2114 /** 2115 * The amount of scale in the x direction around the pivot point. A 2116 * value of 1 means no scaling is applied. 2117 */ 2118 @ViewDebug.ExportedProperty 2119 float mPivotX = 0f; 2120 2121 /** 2122 * The amount of scale in the y direction around the pivot point. A 2123 * value of 1 means no scaling is applied. 2124 */ 2125 @ViewDebug.ExportedProperty 2126 float mPivotY = 0f; 2127 2128 /** 2129 * The opacity of the View. This is a value from 0 to 1, where 0 means 2130 * completely transparent and 1 means completely opaque. 2131 */ 2132 @ViewDebug.ExportedProperty 2133 float mAlpha = 1f; 2134 2135 /** 2136 * The distance in pixels from the left edge of this view's parent 2137 * to the left edge of this view. 2138 * {@hide} 2139 */ 2140 @ViewDebug.ExportedProperty(category = "layout") 2141 protected int mLeft; 2142 /** 2143 * The distance in pixels from the left edge of this view's parent 2144 * to the right edge of this view. 2145 * {@hide} 2146 */ 2147 @ViewDebug.ExportedProperty(category = "layout") 2148 protected int mRight; 2149 /** 2150 * The distance in pixels from the top edge of this view's parent 2151 * to the top edge of this view. 2152 * {@hide} 2153 */ 2154 @ViewDebug.ExportedProperty(category = "layout") 2155 protected int mTop; 2156 /** 2157 * The distance in pixels from the top edge of this view's parent 2158 * to the bottom edge of this view. 2159 * {@hide} 2160 */ 2161 @ViewDebug.ExportedProperty(category = "layout") 2162 protected int mBottom; 2163 2164 /** 2165 * The offset, in pixels, by which the content of this view is scrolled 2166 * horizontally. 2167 * {@hide} 2168 */ 2169 @ViewDebug.ExportedProperty(category = "scrolling") 2170 protected int mScrollX; 2171 /** 2172 * The offset, in pixels, by which the content of this view is scrolled 2173 * vertically. 2174 * {@hide} 2175 */ 2176 @ViewDebug.ExportedProperty(category = "scrolling") 2177 protected int mScrollY; 2178 2179 /** 2180 * The left padding in pixels, that is the distance in pixels between the 2181 * left edge of this view and the left edge of its content. 2182 * {@hide} 2183 */ 2184 @ViewDebug.ExportedProperty(category = "padding") 2185 protected int mPaddingLeft; 2186 /** 2187 * The right padding in pixels, that is the distance in pixels between the 2188 * right edge of this view and the right edge of its content. 2189 * {@hide} 2190 */ 2191 @ViewDebug.ExportedProperty(category = "padding") 2192 protected int mPaddingRight; 2193 /** 2194 * The top padding in pixels, that is the distance in pixels between the 2195 * top edge of this view and the top edge of its content. 2196 * {@hide} 2197 */ 2198 @ViewDebug.ExportedProperty(category = "padding") 2199 protected int mPaddingTop; 2200 /** 2201 * The bottom padding in pixels, that is the distance in pixels between the 2202 * bottom edge of this view and the bottom edge of its content. 2203 * {@hide} 2204 */ 2205 @ViewDebug.ExportedProperty(category = "padding") 2206 protected int mPaddingBottom; 2207 2208 /** 2209 * Briefly describes the view and is primarily used for accessibility support. 2210 */ 2211 private CharSequence mContentDescription; 2212 2213 /** 2214 * Cache the paddingRight set by the user to append to the scrollbar's size. 2215 * 2216 * @hide 2217 */ 2218 @ViewDebug.ExportedProperty(category = "padding") 2219 protected int mUserPaddingRight; 2220 2221 /** 2222 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2223 * 2224 * @hide 2225 */ 2226 @ViewDebug.ExportedProperty(category = "padding") 2227 protected int mUserPaddingBottom; 2228 2229 /** 2230 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2231 * 2232 * @hide 2233 */ 2234 @ViewDebug.ExportedProperty(category = "padding") 2235 protected int mUserPaddingLeft; 2236 2237 /** 2238 * Cache if the user padding is relative. 2239 * 2240 */ 2241 @ViewDebug.ExportedProperty(category = "padding") 2242 boolean mUserPaddingRelative; 2243 2244 /** 2245 * Cache the paddingStart set by the user to append to the scrollbar's size. 2246 * 2247 */ 2248 @ViewDebug.ExportedProperty(category = "padding") 2249 int mUserPaddingStart; 2250 2251 /** 2252 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2253 * 2254 */ 2255 @ViewDebug.ExportedProperty(category = "padding") 2256 int mUserPaddingEnd; 2257 2258 /** 2259 * @hide 2260 */ 2261 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2262 /** 2263 * @hide 2264 */ 2265 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2266 2267 private Resources mResources = null; 2268 2269 private Drawable mBGDrawable; 2270 2271 private int mBackgroundResource; 2272 private boolean mBackgroundSizeChanged; 2273 2274 /** 2275 * Listener used to dispatch focus change events. 2276 * This field should be made private, so it is hidden from the SDK. 2277 * {@hide} 2278 */ 2279 protected OnFocusChangeListener mOnFocusChangeListener; 2280 2281 /** 2282 * Listeners for layout change events. 2283 */ 2284 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2285 2286 /** 2287 * Listeners for attach events. 2288 */ 2289 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2290 2291 /** 2292 * Listener used to dispatch click events. 2293 * This field should be made private, so it is hidden from the SDK. 2294 * {@hide} 2295 */ 2296 protected OnClickListener mOnClickListener; 2297 2298 /** 2299 * Listener used to dispatch long click events. 2300 * This field should be made private, so it is hidden from the SDK. 2301 * {@hide} 2302 */ 2303 protected OnLongClickListener mOnLongClickListener; 2304 2305 /** 2306 * Listener used to build the context menu. 2307 * This field should be made private, so it is hidden from the SDK. 2308 * {@hide} 2309 */ 2310 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2311 2312 private OnKeyListener mOnKeyListener; 2313 2314 private OnTouchListener mOnTouchListener; 2315 2316 private OnHoverListener mOnHoverListener; 2317 2318 private OnGenericMotionListener mOnGenericMotionListener; 2319 2320 private OnDragListener mOnDragListener; 2321 2322 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2323 2324 /** 2325 * The application environment this view lives in. 2326 * This field should be made private, so it is hidden from the SDK. 2327 * {@hide} 2328 */ 2329 protected Context mContext; 2330 2331 private ScrollabilityCache mScrollCache; 2332 2333 private int[] mDrawableState = null; 2334 2335 /** 2336 * Set to true when drawing cache is enabled and cannot be created. 2337 * 2338 * @hide 2339 */ 2340 public boolean mCachingFailed; 2341 2342 private Bitmap mDrawingCache; 2343 private Bitmap mUnscaledDrawingCache; 2344 private HardwareLayer mHardwareLayer; 2345 DisplayList mDisplayList; 2346 2347 /** 2348 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2349 * the user may specify which view to go to next. 2350 */ 2351 private int mNextFocusLeftId = View.NO_ID; 2352 2353 /** 2354 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2355 * the user may specify which view to go to next. 2356 */ 2357 private int mNextFocusRightId = View.NO_ID; 2358 2359 /** 2360 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2361 * the user may specify which view to go to next. 2362 */ 2363 private int mNextFocusUpId = View.NO_ID; 2364 2365 /** 2366 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2367 * the user may specify which view to go to next. 2368 */ 2369 private int mNextFocusDownId = View.NO_ID; 2370 2371 /** 2372 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2373 * the user may specify which view to go to next. 2374 */ 2375 int mNextFocusForwardId = View.NO_ID; 2376 2377 private CheckForLongPress mPendingCheckForLongPress; 2378 private CheckForTap mPendingCheckForTap = null; 2379 private PerformClick mPerformClick; 2380 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2381 2382 private UnsetPressedState mUnsetPressedState; 2383 2384 /** 2385 * Whether the long press's action has been invoked. The tap's action is invoked on the 2386 * up event while a long press is invoked as soon as the long press duration is reached, so 2387 * a long press could be performed before the tap is checked, in which case the tap's action 2388 * should not be invoked. 2389 */ 2390 private boolean mHasPerformedLongPress; 2391 2392 /** 2393 * The minimum height of the view. We'll try our best to have the height 2394 * of this view to at least this amount. 2395 */ 2396 @ViewDebug.ExportedProperty(category = "measurement") 2397 private int mMinHeight; 2398 2399 /** 2400 * The minimum width of the view. We'll try our best to have the width 2401 * of this view to at least this amount. 2402 */ 2403 @ViewDebug.ExportedProperty(category = "measurement") 2404 private int mMinWidth; 2405 2406 /** 2407 * The delegate to handle touch events that are physically in this view 2408 * but should be handled by another view. 2409 */ 2410 private TouchDelegate mTouchDelegate = null; 2411 2412 /** 2413 * Solid color to use as a background when creating the drawing cache. Enables 2414 * the cache to use 16 bit bitmaps instead of 32 bit. 2415 */ 2416 private int mDrawingCacheBackgroundColor = 0; 2417 2418 /** 2419 * Special tree observer used when mAttachInfo is null. 2420 */ 2421 private ViewTreeObserver mFloatingTreeObserver; 2422 2423 /** 2424 * Cache the touch slop from the context that created the view. 2425 */ 2426 private int mTouchSlop; 2427 2428 /** 2429 * Object that handles automatic animation of view properties. 2430 */ 2431 private ViewPropertyAnimator mAnimator = null; 2432 2433 /** 2434 * Flag indicating that a drag can cross window boundaries. When 2435 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2436 * with this flag set, all visible applications will be able to participate 2437 * in the drag operation and receive the dragged content. 2438 * 2439 * @hide 2440 */ 2441 public static final int DRAG_FLAG_GLOBAL = 1; 2442 2443 /** 2444 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2445 */ 2446 private float mVerticalScrollFactor; 2447 2448 /** 2449 * Position of the vertical scroll bar. 2450 */ 2451 private int mVerticalScrollbarPosition; 2452 2453 /** 2454 * Position the scroll bar at the default position as determined by the system. 2455 */ 2456 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2457 2458 /** 2459 * Position the scroll bar along the left edge. 2460 */ 2461 public static final int SCROLLBAR_POSITION_LEFT = 1; 2462 2463 /** 2464 * Position the scroll bar along the right edge. 2465 */ 2466 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2467 2468 /** 2469 * Indicates that the view does not have a layer. 2470 * 2471 * @see #getLayerType() 2472 * @see #setLayerType(int, android.graphics.Paint) 2473 * @see #LAYER_TYPE_SOFTWARE 2474 * @see #LAYER_TYPE_HARDWARE 2475 */ 2476 public static final int LAYER_TYPE_NONE = 0; 2477 2478 /** 2479 * <p>Indicates that the view has a software layer. A software layer is backed 2480 * by a bitmap and causes the view to be rendered using Android's software 2481 * rendering pipeline, even if hardware acceleration is enabled.</p> 2482 * 2483 * <p>Software layers have various usages:</p> 2484 * <p>When the application is not using hardware acceleration, a software layer 2485 * is useful to apply a specific color filter and/or blending mode and/or 2486 * translucency to a view and all its children.</p> 2487 * <p>When the application is using hardware acceleration, a software layer 2488 * is useful to render drawing primitives not supported by the hardware 2489 * accelerated pipeline. It can also be used to cache a complex view tree 2490 * into a texture and reduce the complexity of drawing operations. For instance, 2491 * when animating a complex view tree with a translation, a software layer can 2492 * be used to render the view tree only once.</p> 2493 * <p>Software layers should be avoided when the affected view tree updates 2494 * often. Every update will require to re-render the software layer, which can 2495 * potentially be slow (particularly when hardware acceleration is turned on 2496 * since the layer will have to be uploaded into a hardware texture after every 2497 * update.)</p> 2498 * 2499 * @see #getLayerType() 2500 * @see #setLayerType(int, android.graphics.Paint) 2501 * @see #LAYER_TYPE_NONE 2502 * @see #LAYER_TYPE_HARDWARE 2503 */ 2504 public static final int LAYER_TYPE_SOFTWARE = 1; 2505 2506 /** 2507 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2508 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2509 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2510 * rendering pipeline, but only if hardware acceleration is turned on for the 2511 * view hierarchy. When hardware acceleration is turned off, hardware layers 2512 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2513 * 2514 * <p>A hardware layer is useful to apply a specific color filter and/or 2515 * blending mode and/or translucency to a view and all its children.</p> 2516 * <p>A hardware layer can be used to cache a complex view tree into a 2517 * texture and reduce the complexity of drawing operations. For instance, 2518 * when animating a complex view tree with a translation, a hardware layer can 2519 * be used to render the view tree only once.</p> 2520 * <p>A hardware layer can also be used to increase the rendering quality when 2521 * rotation transformations are applied on a view. It can also be used to 2522 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2523 * 2524 * @see #getLayerType() 2525 * @see #setLayerType(int, android.graphics.Paint) 2526 * @see #LAYER_TYPE_NONE 2527 * @see #LAYER_TYPE_SOFTWARE 2528 */ 2529 public static final int LAYER_TYPE_HARDWARE = 2; 2530 2531 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2532 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2533 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2534 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2535 }) 2536 int mLayerType = LAYER_TYPE_NONE; 2537 Paint mLayerPaint; 2538 Rect mLocalDirtyRect; 2539 2540 /** 2541 * Set to true when the view is sending hover accessibility events because it 2542 * is the innermost hovered view. 2543 */ 2544 private boolean mSendingHoverAccessibilityEvents; 2545 2546 /** 2547 * Text direction is inherited thru {@link ViewGroup} 2548 * @hide 2549 */ 2550 public static final int TEXT_DIRECTION_INHERIT = 0; 2551 2552 /** 2553 * Text direction is using "first strong algorithm". The first strong directional character 2554 * determines the paragraph direction. If there is no strong directional character, the 2555 * paragraph direction is the view's resolved ayout direction. 2556 * 2557 * @hide 2558 */ 2559 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 2560 2561 /** 2562 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 2563 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 2564 * If there are neither, the paragraph direction is the view's resolved layout direction. 2565 * 2566 * @hide 2567 */ 2568 public static final int TEXT_DIRECTION_ANY_RTL = 2; 2569 2570 /** 2571 * Text direction is the same as the one held by a 60% majority of the characters. If there is 2572 * no majority then the paragraph direction is the resolved layout direction of the View. 2573 * 2574 * @hide 2575 */ 2576 public static final int TEXT_DIRECTION_CHAR_COUNT = 3; 2577 2578 /** 2579 * Text direction is forced to LTR. 2580 * 2581 * @hide 2582 */ 2583 public static final int TEXT_DIRECTION_LTR = 4; 2584 2585 /** 2586 * Text direction is forced to RTL. 2587 * 2588 * @hide 2589 */ 2590 public static final int TEXT_DIRECTION_RTL = 5; 2591 2592 /** 2593 * Default text direction is inherited 2594 */ 2595 protected static int DEFAULT_TEXT_DIRECTION = TEXT_DIRECTION_INHERIT; 2596 2597 /** 2598 * Default threshold for "char count" heuristic. 2599 */ 2600 protected static float DEFAULT_TEXT_DIRECTION_CHAR_COUNT_THRESHOLD = 0.6f; 2601 2602 /** 2603 * The text direction that has been defined by {@link #setTextDirection(int)}. 2604 * 2605 * {@hide} 2606 */ 2607 @ViewDebug.ExportedProperty(category = "text", mapping = { 2608 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2609 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2610 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2611 @ViewDebug.IntToString(from = TEXT_DIRECTION_CHAR_COUNT, to = "CHAR_COUNT"), 2612 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2613 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL") 2614 }) 2615 private int mTextDirection = DEFAULT_TEXT_DIRECTION; 2616 2617 /** 2618 * The resolved text direction. This needs resolution if the value is 2619 * TEXT_DIRECTION_INHERIT. The resolution matches mTextDirection if that is 2620 * not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds up the parent 2621 * chain of the view. 2622 * 2623 * {@hide} 2624 */ 2625 @ViewDebug.ExportedProperty(category = "text", mapping = { 2626 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 2627 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 2628 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 2629 @ViewDebug.IntToString(from = TEXT_DIRECTION_CHAR_COUNT, to = "CHAR_COUNT"), 2630 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 2631 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL") 2632 }) 2633 private int mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 2634 2635 /** 2636 * Consistency verifier for debugging purposes. 2637 * @hide 2638 */ 2639 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 2640 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 2641 new InputEventConsistencyVerifier(this, 0) : null; 2642 2643 /** 2644 * Simple constructor to use when creating a view from code. 2645 * 2646 * @param context The Context the view is running in, through which it can 2647 * access the current theme, resources, etc. 2648 */ 2649 public View(Context context) { 2650 mContext = context; 2651 mResources = context != null ? context.getResources() : null; 2652 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED | LAYOUT_DIRECTION_INHERIT; 2653 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2654 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2655 mUserPaddingStart = -1; 2656 mUserPaddingEnd = -1; 2657 mUserPaddingRelative = false; 2658 } 2659 2660 /** 2661 * Constructor that is called when inflating a view from XML. This is called 2662 * when a view is being constructed from an XML file, supplying attributes 2663 * that were specified in the XML file. This version uses a default style of 2664 * 0, so the only attribute values applied are those in the Context's Theme 2665 * and the given AttributeSet. 2666 * 2667 * <p> 2668 * The method onFinishInflate() will be called after all children have been 2669 * added. 2670 * 2671 * @param context The Context the view is running in, through which it can 2672 * access the current theme, resources, etc. 2673 * @param attrs The attributes of the XML tag that is inflating the view. 2674 * @see #View(Context, AttributeSet, int) 2675 */ 2676 public View(Context context, AttributeSet attrs) { 2677 this(context, attrs, 0); 2678 } 2679 2680 /** 2681 * Perform inflation from XML and apply a class-specific base style. This 2682 * constructor of View allows subclasses to use their own base style when 2683 * they are inflating. For example, a Button class's constructor would call 2684 * this version of the super class constructor and supply 2685 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2686 * the theme's button style to modify all of the base view attributes (in 2687 * particular its background) as well as the Button class's attributes. 2688 * 2689 * @param context The Context the view is running in, through which it can 2690 * access the current theme, resources, etc. 2691 * @param attrs The attributes of the XML tag that is inflating the view. 2692 * @param defStyle The default style to apply to this view. If 0, no style 2693 * will be applied (beyond what is included in the theme). This may 2694 * either be an attribute resource, whose value will be retrieved 2695 * from the current theme, or an explicit style resource. 2696 * @see #View(Context, AttributeSet) 2697 */ 2698 public View(Context context, AttributeSet attrs, int defStyle) { 2699 this(context); 2700 2701 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2702 defStyle, 0); 2703 2704 Drawable background = null; 2705 2706 int leftPadding = -1; 2707 int topPadding = -1; 2708 int rightPadding = -1; 2709 int bottomPadding = -1; 2710 int startPadding = -1; 2711 int endPadding = -1; 2712 2713 int padding = -1; 2714 2715 int viewFlagValues = 0; 2716 int viewFlagMasks = 0; 2717 2718 boolean setScrollContainer = false; 2719 2720 int x = 0; 2721 int y = 0; 2722 2723 float tx = 0; 2724 float ty = 0; 2725 float rotation = 0; 2726 float rotationX = 0; 2727 float rotationY = 0; 2728 float sx = 1f; 2729 float sy = 1f; 2730 boolean transformSet = false; 2731 2732 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2733 2734 int overScrollMode = mOverScrollMode; 2735 final int N = a.getIndexCount(); 2736 for (int i = 0; i < N; i++) { 2737 int attr = a.getIndex(i); 2738 switch (attr) { 2739 case com.android.internal.R.styleable.View_background: 2740 background = a.getDrawable(attr); 2741 break; 2742 case com.android.internal.R.styleable.View_padding: 2743 padding = a.getDimensionPixelSize(attr, -1); 2744 break; 2745 case com.android.internal.R.styleable.View_paddingLeft: 2746 leftPadding = a.getDimensionPixelSize(attr, -1); 2747 break; 2748 case com.android.internal.R.styleable.View_paddingTop: 2749 topPadding = a.getDimensionPixelSize(attr, -1); 2750 break; 2751 case com.android.internal.R.styleable.View_paddingRight: 2752 rightPadding = a.getDimensionPixelSize(attr, -1); 2753 break; 2754 case com.android.internal.R.styleable.View_paddingBottom: 2755 bottomPadding = a.getDimensionPixelSize(attr, -1); 2756 break; 2757 case com.android.internal.R.styleable.View_paddingStart: 2758 startPadding = a.getDimensionPixelSize(attr, -1); 2759 break; 2760 case com.android.internal.R.styleable.View_paddingEnd: 2761 endPadding = a.getDimensionPixelSize(attr, -1); 2762 break; 2763 case com.android.internal.R.styleable.View_scrollX: 2764 x = a.getDimensionPixelOffset(attr, 0); 2765 break; 2766 case com.android.internal.R.styleable.View_scrollY: 2767 y = a.getDimensionPixelOffset(attr, 0); 2768 break; 2769 case com.android.internal.R.styleable.View_alpha: 2770 setAlpha(a.getFloat(attr, 1f)); 2771 break; 2772 case com.android.internal.R.styleable.View_transformPivotX: 2773 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2774 break; 2775 case com.android.internal.R.styleable.View_transformPivotY: 2776 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2777 break; 2778 case com.android.internal.R.styleable.View_translationX: 2779 tx = a.getDimensionPixelOffset(attr, 0); 2780 transformSet = true; 2781 break; 2782 case com.android.internal.R.styleable.View_translationY: 2783 ty = a.getDimensionPixelOffset(attr, 0); 2784 transformSet = true; 2785 break; 2786 case com.android.internal.R.styleable.View_rotation: 2787 rotation = a.getFloat(attr, 0); 2788 transformSet = true; 2789 break; 2790 case com.android.internal.R.styleable.View_rotationX: 2791 rotationX = a.getFloat(attr, 0); 2792 transformSet = true; 2793 break; 2794 case com.android.internal.R.styleable.View_rotationY: 2795 rotationY = a.getFloat(attr, 0); 2796 transformSet = true; 2797 break; 2798 case com.android.internal.R.styleable.View_scaleX: 2799 sx = a.getFloat(attr, 1f); 2800 transformSet = true; 2801 break; 2802 case com.android.internal.R.styleable.View_scaleY: 2803 sy = a.getFloat(attr, 1f); 2804 transformSet = true; 2805 break; 2806 case com.android.internal.R.styleable.View_id: 2807 mID = a.getResourceId(attr, NO_ID); 2808 break; 2809 case com.android.internal.R.styleable.View_tag: 2810 mTag = a.getText(attr); 2811 break; 2812 case com.android.internal.R.styleable.View_fitsSystemWindows: 2813 if (a.getBoolean(attr, false)) { 2814 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2815 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2816 } 2817 break; 2818 case com.android.internal.R.styleable.View_focusable: 2819 if (a.getBoolean(attr, false)) { 2820 viewFlagValues |= FOCUSABLE; 2821 viewFlagMasks |= FOCUSABLE_MASK; 2822 } 2823 break; 2824 case com.android.internal.R.styleable.View_focusableInTouchMode: 2825 if (a.getBoolean(attr, false)) { 2826 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2827 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2828 } 2829 break; 2830 case com.android.internal.R.styleable.View_clickable: 2831 if (a.getBoolean(attr, false)) { 2832 viewFlagValues |= CLICKABLE; 2833 viewFlagMasks |= CLICKABLE; 2834 } 2835 break; 2836 case com.android.internal.R.styleable.View_longClickable: 2837 if (a.getBoolean(attr, false)) { 2838 viewFlagValues |= LONG_CLICKABLE; 2839 viewFlagMasks |= LONG_CLICKABLE; 2840 } 2841 break; 2842 case com.android.internal.R.styleable.View_saveEnabled: 2843 if (!a.getBoolean(attr, true)) { 2844 viewFlagValues |= SAVE_DISABLED; 2845 viewFlagMasks |= SAVE_DISABLED_MASK; 2846 } 2847 break; 2848 case com.android.internal.R.styleable.View_duplicateParentState: 2849 if (a.getBoolean(attr, false)) { 2850 viewFlagValues |= DUPLICATE_PARENT_STATE; 2851 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2852 } 2853 break; 2854 case com.android.internal.R.styleable.View_visibility: 2855 final int visibility = a.getInt(attr, 0); 2856 if (visibility != 0) { 2857 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2858 viewFlagMasks |= VISIBILITY_MASK; 2859 } 2860 break; 2861 case com.android.internal.R.styleable.View_layoutDirection: 2862 // Clear any HORIZONTAL_DIRECTION flag already set 2863 viewFlagValues &= ~LAYOUT_DIRECTION_MASK; 2864 // Set the HORIZONTAL_DIRECTION flags depending on the value of the attribute 2865 final int layoutDirection = a.getInt(attr, -1); 2866 if (layoutDirection != -1) { 2867 viewFlagValues |= LAYOUT_DIRECTION_FLAGS[layoutDirection]; 2868 } else { 2869 // Set to default (LAYOUT_DIRECTION_INHERIT) 2870 viewFlagValues |= LAYOUT_DIRECTION_DEFAULT; 2871 } 2872 viewFlagMasks |= LAYOUT_DIRECTION_MASK; 2873 break; 2874 case com.android.internal.R.styleable.View_drawingCacheQuality: 2875 final int cacheQuality = a.getInt(attr, 0); 2876 if (cacheQuality != 0) { 2877 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2878 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2879 } 2880 break; 2881 case com.android.internal.R.styleable.View_contentDescription: 2882 mContentDescription = a.getString(attr); 2883 break; 2884 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2885 if (!a.getBoolean(attr, true)) { 2886 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2887 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2888 } 2889 break; 2890 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2891 if (!a.getBoolean(attr, true)) { 2892 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2893 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2894 } 2895 break; 2896 case R.styleable.View_scrollbars: 2897 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2898 if (scrollbars != SCROLLBARS_NONE) { 2899 viewFlagValues |= scrollbars; 2900 viewFlagMasks |= SCROLLBARS_MASK; 2901 initializeScrollbars(a); 2902 } 2903 break; 2904 case R.styleable.View_fadingEdge: 2905 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2906 if (fadingEdge != FADING_EDGE_NONE) { 2907 viewFlagValues |= fadingEdge; 2908 viewFlagMasks |= FADING_EDGE_MASK; 2909 initializeFadingEdge(a); 2910 } 2911 break; 2912 case R.styleable.View_scrollbarStyle: 2913 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2914 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2915 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2916 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2917 } 2918 break; 2919 case R.styleable.View_isScrollContainer: 2920 setScrollContainer = true; 2921 if (a.getBoolean(attr, false)) { 2922 setScrollContainer(true); 2923 } 2924 break; 2925 case com.android.internal.R.styleable.View_keepScreenOn: 2926 if (a.getBoolean(attr, false)) { 2927 viewFlagValues |= KEEP_SCREEN_ON; 2928 viewFlagMasks |= KEEP_SCREEN_ON; 2929 } 2930 break; 2931 case R.styleable.View_filterTouchesWhenObscured: 2932 if (a.getBoolean(attr, false)) { 2933 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2934 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2935 } 2936 break; 2937 case R.styleable.View_nextFocusLeft: 2938 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2939 break; 2940 case R.styleable.View_nextFocusRight: 2941 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2942 break; 2943 case R.styleable.View_nextFocusUp: 2944 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2945 break; 2946 case R.styleable.View_nextFocusDown: 2947 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2948 break; 2949 case R.styleable.View_nextFocusForward: 2950 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2951 break; 2952 case R.styleable.View_minWidth: 2953 mMinWidth = a.getDimensionPixelSize(attr, 0); 2954 break; 2955 case R.styleable.View_minHeight: 2956 mMinHeight = a.getDimensionPixelSize(attr, 0); 2957 break; 2958 case R.styleable.View_onClick: 2959 if (context.isRestricted()) { 2960 throw new IllegalStateException("The android:onClick attribute cannot " 2961 + "be used within a restricted context"); 2962 } 2963 2964 final String handlerName = a.getString(attr); 2965 if (handlerName != null) { 2966 setOnClickListener(new OnClickListener() { 2967 private Method mHandler; 2968 2969 public void onClick(View v) { 2970 if (mHandler == null) { 2971 try { 2972 mHandler = getContext().getClass().getMethod(handlerName, 2973 View.class); 2974 } catch (NoSuchMethodException e) { 2975 int id = getId(); 2976 String idText = id == NO_ID ? "" : " with id '" 2977 + getContext().getResources().getResourceEntryName( 2978 id) + "'"; 2979 throw new IllegalStateException("Could not find a method " + 2980 handlerName + "(View) in the activity " 2981 + getContext().getClass() + " for onClick handler" 2982 + " on view " + View.this.getClass() + idText, e); 2983 } 2984 } 2985 2986 try { 2987 mHandler.invoke(getContext(), View.this); 2988 } catch (IllegalAccessException e) { 2989 throw new IllegalStateException("Could not execute non " 2990 + "public method of the activity", e); 2991 } catch (InvocationTargetException e) { 2992 throw new IllegalStateException("Could not execute " 2993 + "method of the activity", e); 2994 } 2995 } 2996 }); 2997 } 2998 break; 2999 case R.styleable.View_overScrollMode: 3000 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3001 break; 3002 case R.styleable.View_verticalScrollbarPosition: 3003 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3004 break; 3005 case R.styleable.View_layerType: 3006 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3007 break; 3008 case R.styleable.View_textDirection: 3009 mTextDirection = a.getInt(attr, DEFAULT_TEXT_DIRECTION); 3010 break; 3011 } 3012 } 3013 3014 setOverScrollMode(overScrollMode); 3015 3016 if (background != null) { 3017 setBackgroundDrawable(background); 3018 } 3019 3020 mUserPaddingRelative = (startPadding >= 0 || endPadding >= 0); 3021 3022 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3023 // layout direction). Those cached values will be used later during padding resolution. 3024 mUserPaddingStart = startPadding; 3025 mUserPaddingEnd = endPadding; 3026 3027 if (padding >= 0) { 3028 leftPadding = padding; 3029 topPadding = padding; 3030 rightPadding = padding; 3031 bottomPadding = padding; 3032 } 3033 3034 // If the user specified the padding (either with android:padding or 3035 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3036 // use the default padding or the padding from the background drawable 3037 // (stored at this point in mPadding*) 3038 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3039 topPadding >= 0 ? topPadding : mPaddingTop, 3040 rightPadding >= 0 ? rightPadding : mPaddingRight, 3041 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3042 3043 if (viewFlagMasks != 0) { 3044 setFlags(viewFlagValues, viewFlagMasks); 3045 } 3046 3047 // Needs to be called after mViewFlags is set 3048 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3049 recomputePadding(); 3050 } 3051 3052 if (x != 0 || y != 0) { 3053 scrollTo(x, y); 3054 } 3055 3056 if (transformSet) { 3057 setTranslationX(tx); 3058 setTranslationY(ty); 3059 setRotation(rotation); 3060 setRotationX(rotationX); 3061 setRotationY(rotationY); 3062 setScaleX(sx); 3063 setScaleY(sy); 3064 } 3065 3066 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3067 setScrollContainer(true); 3068 } 3069 3070 computeOpaqueFlags(); 3071 3072 a.recycle(); 3073 } 3074 3075 /** 3076 * Non-public constructor for use in testing 3077 */ 3078 View() { 3079 } 3080 3081 /** 3082 * <p> 3083 * Initializes the fading edges from a given set of styled attributes. This 3084 * method should be called by subclasses that need fading edges and when an 3085 * instance of these subclasses is created programmatically rather than 3086 * being inflated from XML. This method is automatically called when the XML 3087 * is inflated. 3088 * </p> 3089 * 3090 * @param a the styled attributes set to initialize the fading edges from 3091 */ 3092 protected void initializeFadingEdge(TypedArray a) { 3093 initScrollCache(); 3094 3095 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3096 R.styleable.View_fadingEdgeLength, 3097 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3098 } 3099 3100 /** 3101 * Returns the size of the vertical faded edges used to indicate that more 3102 * content in this view is visible. 3103 * 3104 * @return The size in pixels of the vertical faded edge or 0 if vertical 3105 * faded edges are not enabled for this view. 3106 * @attr ref android.R.styleable#View_fadingEdgeLength 3107 */ 3108 public int getVerticalFadingEdgeLength() { 3109 if (isVerticalFadingEdgeEnabled()) { 3110 ScrollabilityCache cache = mScrollCache; 3111 if (cache != null) { 3112 return cache.fadingEdgeLength; 3113 } 3114 } 3115 return 0; 3116 } 3117 3118 /** 3119 * Set the size of the faded edge used to indicate that more content in this 3120 * view is available. Will not change whether the fading edge is enabled; use 3121 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3122 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3123 * for the vertical or horizontal fading edges. 3124 * 3125 * @param length The size in pixels of the faded edge used to indicate that more 3126 * content in this view is visible. 3127 */ 3128 public void setFadingEdgeLength(int length) { 3129 initScrollCache(); 3130 mScrollCache.fadingEdgeLength = length; 3131 } 3132 3133 /** 3134 * Returns the size of the horizontal faded edges used to indicate that more 3135 * content in this view is visible. 3136 * 3137 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3138 * faded edges are not enabled for this view. 3139 * @attr ref android.R.styleable#View_fadingEdgeLength 3140 */ 3141 public int getHorizontalFadingEdgeLength() { 3142 if (isHorizontalFadingEdgeEnabled()) { 3143 ScrollabilityCache cache = mScrollCache; 3144 if (cache != null) { 3145 return cache.fadingEdgeLength; 3146 } 3147 } 3148 return 0; 3149 } 3150 3151 /** 3152 * Returns the width of the vertical scrollbar. 3153 * 3154 * @return The width in pixels of the vertical scrollbar or 0 if there 3155 * is no vertical scrollbar. 3156 */ 3157 public int getVerticalScrollbarWidth() { 3158 ScrollabilityCache cache = mScrollCache; 3159 if (cache != null) { 3160 ScrollBarDrawable scrollBar = cache.scrollBar; 3161 if (scrollBar != null) { 3162 int size = scrollBar.getSize(true); 3163 if (size <= 0) { 3164 size = cache.scrollBarSize; 3165 } 3166 return size; 3167 } 3168 return 0; 3169 } 3170 return 0; 3171 } 3172 3173 /** 3174 * Returns the height of the horizontal scrollbar. 3175 * 3176 * @return The height in pixels of the horizontal scrollbar or 0 if 3177 * there is no horizontal scrollbar. 3178 */ 3179 protected int getHorizontalScrollbarHeight() { 3180 ScrollabilityCache cache = mScrollCache; 3181 if (cache != null) { 3182 ScrollBarDrawable scrollBar = cache.scrollBar; 3183 if (scrollBar != null) { 3184 int size = scrollBar.getSize(false); 3185 if (size <= 0) { 3186 size = cache.scrollBarSize; 3187 } 3188 return size; 3189 } 3190 return 0; 3191 } 3192 return 0; 3193 } 3194 3195 /** 3196 * <p> 3197 * Initializes the scrollbars from a given set of styled attributes. This 3198 * method should be called by subclasses that need scrollbars and when an 3199 * instance of these subclasses is created programmatically rather than 3200 * being inflated from XML. This method is automatically called when the XML 3201 * is inflated. 3202 * </p> 3203 * 3204 * @param a the styled attributes set to initialize the scrollbars from 3205 */ 3206 protected void initializeScrollbars(TypedArray a) { 3207 initScrollCache(); 3208 3209 final ScrollabilityCache scrollabilityCache = mScrollCache; 3210 3211 if (scrollabilityCache.scrollBar == null) { 3212 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3213 } 3214 3215 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3216 3217 if (!fadeScrollbars) { 3218 scrollabilityCache.state = ScrollabilityCache.ON; 3219 } 3220 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3221 3222 3223 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3224 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3225 .getScrollBarFadeDuration()); 3226 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3227 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3228 ViewConfiguration.getScrollDefaultDelay()); 3229 3230 3231 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3232 com.android.internal.R.styleable.View_scrollbarSize, 3233 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3234 3235 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3236 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3237 3238 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3239 if (thumb != null) { 3240 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3241 } 3242 3243 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3244 false); 3245 if (alwaysDraw) { 3246 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3247 } 3248 3249 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3250 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3251 3252 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3253 if (thumb != null) { 3254 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3255 } 3256 3257 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3258 false); 3259 if (alwaysDraw) { 3260 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3261 } 3262 3263 // Re-apply user/background padding so that scrollbar(s) get added 3264 resolvePadding(); 3265 } 3266 3267 /** 3268 * <p> 3269 * Initalizes the scrollability cache if necessary. 3270 * </p> 3271 */ 3272 private void initScrollCache() { 3273 if (mScrollCache == null) { 3274 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3275 } 3276 } 3277 3278 /** 3279 * Set the position of the vertical scroll bar. Should be one of 3280 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3281 * {@link #SCROLLBAR_POSITION_RIGHT}. 3282 * 3283 * @param position Where the vertical scroll bar should be positioned. 3284 */ 3285 public void setVerticalScrollbarPosition(int position) { 3286 if (mVerticalScrollbarPosition != position) { 3287 mVerticalScrollbarPosition = position; 3288 computeOpaqueFlags(); 3289 resolvePadding(); 3290 } 3291 } 3292 3293 /** 3294 * @return The position where the vertical scroll bar will show, if applicable. 3295 * @see #setVerticalScrollbarPosition(int) 3296 */ 3297 public int getVerticalScrollbarPosition() { 3298 return mVerticalScrollbarPosition; 3299 } 3300 3301 /** 3302 * Register a callback to be invoked when focus of this view changed. 3303 * 3304 * @param l The callback that will run. 3305 */ 3306 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3307 mOnFocusChangeListener = l; 3308 } 3309 3310 /** 3311 * Add a listener that will be called when the bounds of the view change due to 3312 * layout processing. 3313 * 3314 * @param listener The listener that will be called when layout bounds change. 3315 */ 3316 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3317 if (mOnLayoutChangeListeners == null) { 3318 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3319 } 3320 mOnLayoutChangeListeners.add(listener); 3321 } 3322 3323 /** 3324 * Remove a listener for layout changes. 3325 * 3326 * @param listener The listener for layout bounds change. 3327 */ 3328 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3329 if (mOnLayoutChangeListeners == null) { 3330 return; 3331 } 3332 mOnLayoutChangeListeners.remove(listener); 3333 } 3334 3335 /** 3336 * Add a listener for attach state changes. 3337 * 3338 * This listener will be called whenever this view is attached or detached 3339 * from a window. Remove the listener using 3340 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3341 * 3342 * @param listener Listener to attach 3343 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3344 */ 3345 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3346 if (mOnAttachStateChangeListeners == null) { 3347 mOnAttachStateChangeListeners = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3348 } 3349 mOnAttachStateChangeListeners.add(listener); 3350 } 3351 3352 /** 3353 * Remove a listener for attach state changes. The listener will receive no further 3354 * notification of window attach/detach events. 3355 * 3356 * @param listener Listener to remove 3357 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3358 */ 3359 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3360 if (mOnAttachStateChangeListeners == null) { 3361 return; 3362 } 3363 mOnAttachStateChangeListeners.remove(listener); 3364 } 3365 3366 /** 3367 * Returns the focus-change callback registered for this view. 3368 * 3369 * @return The callback, or null if one is not registered. 3370 */ 3371 public OnFocusChangeListener getOnFocusChangeListener() { 3372 return mOnFocusChangeListener; 3373 } 3374 3375 /** 3376 * Register a callback to be invoked when this view is clicked. If this view is not 3377 * clickable, it becomes clickable. 3378 * 3379 * @param l The callback that will run 3380 * 3381 * @see #setClickable(boolean) 3382 */ 3383 public void setOnClickListener(OnClickListener l) { 3384 if (!isClickable()) { 3385 setClickable(true); 3386 } 3387 mOnClickListener = l; 3388 } 3389 3390 /** 3391 * Register a callback to be invoked when this view is clicked and held. If this view is not 3392 * long clickable, it becomes long clickable. 3393 * 3394 * @param l The callback that will run 3395 * 3396 * @see #setLongClickable(boolean) 3397 */ 3398 public void setOnLongClickListener(OnLongClickListener l) { 3399 if (!isLongClickable()) { 3400 setLongClickable(true); 3401 } 3402 mOnLongClickListener = l; 3403 } 3404 3405 /** 3406 * Register a callback to be invoked when the context menu for this view is 3407 * being built. If this view is not long clickable, it becomes long clickable. 3408 * 3409 * @param l The callback that will run 3410 * 3411 */ 3412 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3413 if (!isLongClickable()) { 3414 setLongClickable(true); 3415 } 3416 mOnCreateContextMenuListener = l; 3417 } 3418 3419 /** 3420 * Call this view's OnClickListener, if it is defined. 3421 * 3422 * @return True there was an assigned OnClickListener that was called, false 3423 * otherwise is returned. 3424 */ 3425 public boolean performClick() { 3426 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3427 3428 if (mOnClickListener != null) { 3429 playSoundEffect(SoundEffectConstants.CLICK); 3430 mOnClickListener.onClick(this); 3431 return true; 3432 } 3433 3434 return false; 3435 } 3436 3437 /** 3438 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3439 * OnLongClickListener did not consume the event. 3440 * 3441 * @return True if one of the above receivers consumed the event, false otherwise. 3442 */ 3443 public boolean performLongClick() { 3444 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3445 3446 boolean handled = false; 3447 if (mOnLongClickListener != null) { 3448 handled = mOnLongClickListener.onLongClick(View.this); 3449 } 3450 if (!handled) { 3451 handled = showContextMenu(); 3452 } 3453 if (handled) { 3454 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3455 } 3456 return handled; 3457 } 3458 3459 /** 3460 * Performs button-related actions during a touch down event. 3461 * 3462 * @param event The event. 3463 * @return True if the down was consumed. 3464 * 3465 * @hide 3466 */ 3467 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3468 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3469 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3470 return true; 3471 } 3472 } 3473 return false; 3474 } 3475 3476 /** 3477 * Bring up the context menu for this view. 3478 * 3479 * @return Whether a context menu was displayed. 3480 */ 3481 public boolean showContextMenu() { 3482 return getParent().showContextMenuForChild(this); 3483 } 3484 3485 /** 3486 * Bring up the context menu for this view, referring to the item under the specified point. 3487 * 3488 * @param x The referenced x coordinate. 3489 * @param y The referenced y coordinate. 3490 * @param metaState The keyboard modifiers that were pressed. 3491 * @return Whether a context menu was displayed. 3492 * 3493 * @hide 3494 */ 3495 public boolean showContextMenu(float x, float y, int metaState) { 3496 return showContextMenu(); 3497 } 3498 3499 /** 3500 * Start an action mode. 3501 * 3502 * @param callback Callback that will control the lifecycle of the action mode 3503 * @return The new action mode if it is started, null otherwise 3504 * 3505 * @see ActionMode 3506 */ 3507 public ActionMode startActionMode(ActionMode.Callback callback) { 3508 return getParent().startActionModeForChild(this, callback); 3509 } 3510 3511 /** 3512 * Register a callback to be invoked when a key is pressed in this view. 3513 * @param l the key listener to attach to this view 3514 */ 3515 public void setOnKeyListener(OnKeyListener l) { 3516 mOnKeyListener = l; 3517 } 3518 3519 /** 3520 * Register a callback to be invoked when a touch event is sent to this view. 3521 * @param l the touch listener to attach to this view 3522 */ 3523 public void setOnTouchListener(OnTouchListener l) { 3524 mOnTouchListener = l; 3525 } 3526 3527 /** 3528 * Register a callback to be invoked when a generic motion event is sent to this view. 3529 * @param l the generic motion listener to attach to this view 3530 */ 3531 public void setOnGenericMotionListener(OnGenericMotionListener l) { 3532 mOnGenericMotionListener = l; 3533 } 3534 3535 /** 3536 * Register a callback to be invoked when a hover event is sent to this view. 3537 * @param l the hover listener to attach to this view 3538 */ 3539 public void setOnHoverListener(OnHoverListener l) { 3540 mOnHoverListener = l; 3541 } 3542 3543 /** 3544 * Register a drag event listener callback object for this View. The parameter is 3545 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3546 * View, the system calls the 3547 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3548 * @param l An implementation of {@link android.view.View.OnDragListener}. 3549 */ 3550 public void setOnDragListener(OnDragListener l) { 3551 mOnDragListener = l; 3552 } 3553 3554 /** 3555 * Give this view focus. This will cause 3556 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3557 * 3558 * Note: this does not check whether this {@link View} should get focus, it just 3559 * gives it focus no matter what. It should only be called internally by framework 3560 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3561 * 3562 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 3563 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 3564 * focus moved when requestFocus() is called. It may not always 3565 * apply, in which case use the default View.FOCUS_DOWN. 3566 * @param previouslyFocusedRect The rectangle of the view that had focus 3567 * prior in this View's coordinate system. 3568 */ 3569 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3570 if (DBG) { 3571 System.out.println(this + " requestFocus()"); 3572 } 3573 3574 if ((mPrivateFlags & FOCUSED) == 0) { 3575 mPrivateFlags |= FOCUSED; 3576 3577 if (mParent != null) { 3578 mParent.requestChildFocus(this, this); 3579 } 3580 3581 onFocusChanged(true, direction, previouslyFocusedRect); 3582 refreshDrawableState(); 3583 } 3584 } 3585 3586 /** 3587 * Request that a rectangle of this view be visible on the screen, 3588 * scrolling if necessary just enough. 3589 * 3590 * <p>A View should call this if it maintains some notion of which part 3591 * of its content is interesting. For example, a text editing view 3592 * should call this when its cursor moves. 3593 * 3594 * @param rectangle The rectangle. 3595 * @return Whether any parent scrolled. 3596 */ 3597 public boolean requestRectangleOnScreen(Rect rectangle) { 3598 return requestRectangleOnScreen(rectangle, false); 3599 } 3600 3601 /** 3602 * Request that a rectangle of this view be visible on the screen, 3603 * scrolling if necessary just enough. 3604 * 3605 * <p>A View should call this if it maintains some notion of which part 3606 * of its content is interesting. For example, a text editing view 3607 * should call this when its cursor moves. 3608 * 3609 * <p>When <code>immediate</code> is set to true, scrolling will not be 3610 * animated. 3611 * 3612 * @param rectangle The rectangle. 3613 * @param immediate True to forbid animated scrolling, false otherwise 3614 * @return Whether any parent scrolled. 3615 */ 3616 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3617 View child = this; 3618 ViewParent parent = mParent; 3619 boolean scrolled = false; 3620 while (parent != null) { 3621 scrolled |= parent.requestChildRectangleOnScreen(child, 3622 rectangle, immediate); 3623 3624 // offset rect so next call has the rectangle in the 3625 // coordinate system of its direct child. 3626 rectangle.offset(child.getLeft(), child.getTop()); 3627 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3628 3629 if (!(parent instanceof View)) { 3630 break; 3631 } 3632 3633 child = (View) parent; 3634 parent = child.getParent(); 3635 } 3636 return scrolled; 3637 } 3638 3639 /** 3640 * Called when this view wants to give up focus. This will cause 3641 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 3642 */ 3643 public void clearFocus() { 3644 if (DBG) { 3645 System.out.println(this + " clearFocus()"); 3646 } 3647 3648 if ((mPrivateFlags & FOCUSED) != 0) { 3649 mPrivateFlags &= ~FOCUSED; 3650 3651 if (mParent != null) { 3652 mParent.clearChildFocus(this); 3653 } 3654 3655 onFocusChanged(false, 0, null); 3656 refreshDrawableState(); 3657 } 3658 } 3659 3660 /** 3661 * Called to clear the focus of a view that is about to be removed. 3662 * Doesn't call clearChildFocus, which prevents this view from taking 3663 * focus again before it has been removed from the parent 3664 */ 3665 void clearFocusForRemoval() { 3666 if ((mPrivateFlags & FOCUSED) != 0) { 3667 mPrivateFlags &= ~FOCUSED; 3668 3669 onFocusChanged(false, 0, null); 3670 refreshDrawableState(); 3671 } 3672 } 3673 3674 /** 3675 * Called internally by the view system when a new view is getting focus. 3676 * This is what clears the old focus. 3677 */ 3678 void unFocus() { 3679 if (DBG) { 3680 System.out.println(this + " unFocus()"); 3681 } 3682 3683 if ((mPrivateFlags & FOCUSED) != 0) { 3684 mPrivateFlags &= ~FOCUSED; 3685 3686 onFocusChanged(false, 0, null); 3687 refreshDrawableState(); 3688 } 3689 } 3690 3691 /** 3692 * Returns true if this view has focus iteself, or is the ancestor of the 3693 * view that has focus. 3694 * 3695 * @return True if this view has or contains focus, false otherwise. 3696 */ 3697 @ViewDebug.ExportedProperty(category = "focus") 3698 public boolean hasFocus() { 3699 return (mPrivateFlags & FOCUSED) != 0; 3700 } 3701 3702 /** 3703 * Returns true if this view is focusable or if it contains a reachable View 3704 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3705 * is a View whose parents do not block descendants focus. 3706 * 3707 * Only {@link #VISIBLE} views are considered focusable. 3708 * 3709 * @return True if the view is focusable or if the view contains a focusable 3710 * View, false otherwise. 3711 * 3712 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3713 */ 3714 public boolean hasFocusable() { 3715 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3716 } 3717 3718 /** 3719 * Called by the view system when the focus state of this view changes. 3720 * When the focus change event is caused by directional navigation, direction 3721 * and previouslyFocusedRect provide insight into where the focus is coming from. 3722 * When overriding, be sure to call up through to the super class so that 3723 * the standard focus handling will occur. 3724 * 3725 * @param gainFocus True if the View has focus; false otherwise. 3726 * @param direction The direction focus has moved when requestFocus() 3727 * is called to give this view focus. Values are 3728 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3729 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3730 * It may not always apply, in which case use the default. 3731 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3732 * system, of the previously focused view. If applicable, this will be 3733 * passed in as finer grained information about where the focus is coming 3734 * from (in addition to direction). Will be <code>null</code> otherwise. 3735 */ 3736 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3737 if (gainFocus) { 3738 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3739 } 3740 3741 InputMethodManager imm = InputMethodManager.peekInstance(); 3742 if (!gainFocus) { 3743 if (isPressed()) { 3744 setPressed(false); 3745 } 3746 if (imm != null && mAttachInfo != null 3747 && mAttachInfo.mHasWindowFocus) { 3748 imm.focusOut(this); 3749 } 3750 onFocusLost(); 3751 } else if (imm != null && mAttachInfo != null 3752 && mAttachInfo.mHasWindowFocus) { 3753 imm.focusIn(this); 3754 } 3755 3756 invalidate(true); 3757 if (mOnFocusChangeListener != null) { 3758 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3759 } 3760 3761 if (mAttachInfo != null) { 3762 mAttachInfo.mKeyDispatchState.reset(this); 3763 } 3764 } 3765 3766 /** 3767 * Sends an accessibility event of the given type. If accessiiblity is 3768 * not enabled this method has no effect. The default implementation calls 3769 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 3770 * to populate information about the event source (this View), then calls 3771 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 3772 * populate the text content of the event source including its descendants, 3773 * and last calls 3774 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 3775 * on its parent to resuest sending of the event to interested parties. 3776 * 3777 * @param eventType The type of the event to send. 3778 * 3779 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 3780 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3781 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 3782 */ 3783 public void sendAccessibilityEvent(int eventType) { 3784 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3785 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3786 } 3787 } 3788 3789 /** 3790 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 3791 * takes as an argument an empty {@link AccessibilityEvent} and does not 3792 * perfrom a check whether accessibility is enabled. 3793 * 3794 * @param event The event to send. 3795 * 3796 * @see #sendAccessibilityEvent(int) 3797 */ 3798 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3799 if (!isShown()) { 3800 return; 3801 } 3802 onInitializeAccessibilityEvent(event); 3803 dispatchPopulateAccessibilityEvent(event); 3804 // In the beginning we called #isShown(), so we know that getParent() is not null. 3805 getParent().requestSendAccessibilityEvent(this, event); 3806 } 3807 3808 /** 3809 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 3810 * to its children for adding their text content to the event. Note that the 3811 * event text is populated in a separate dispatch path since we add to the 3812 * event not only the text of the source but also the text of all its descendants. 3813 * </p> 3814 * A typical implementation will call 3815 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 3816 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3817 * on each child. Override this method if custom population of the event text 3818 * content is required. 3819 * 3820 * @param event The event. 3821 * 3822 * @return True if the event population was completed. 3823 */ 3824 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3825 onPopulateAccessibilityEvent(event); 3826 return false; 3827 } 3828 3829 /** 3830 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 3831 * giving a chance to this View to populate the accessibility event with its 3832 * text content. While the implementation is free to modify other event 3833 * attributes this should be performed in 3834 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 3835 * <p> 3836 * Example: Adding formatted date string to an accessibility event in addition 3837 * to the text added by the super implementation. 3838 * </p><p><pre><code> 3839 * public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3840 * super.onPopulateAccessibilityEvent(event); 3841 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 3842 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 3843 * mCurrentDate.getTimeInMillis(), flags); 3844 * event.getText().add(selectedDateUtterance); 3845 * } 3846 * </code></pre></p> 3847 * 3848 * @param event The accessibility event which to populate. 3849 * 3850 * @see #sendAccessibilityEvent(int) 3851 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3852 */ 3853 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 3854 } 3855 3856 /** 3857 * Initializes an {@link AccessibilityEvent} with information about the 3858 * the type of the event and this View which is the event source. In other 3859 * words, the source of an accessibility event is the view whose state 3860 * change triggered firing the event. 3861 * <p> 3862 * Example: Setting the password property of an event in addition 3863 * to properties set by the super implementation. 3864 * </p><p><pre><code> 3865 * public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3866 * super.onInitializeAccessibilityEvent(event); 3867 * event.setPassword(true); 3868 * } 3869 * </code></pre></p> 3870 * @param event The event to initialeze. 3871 * 3872 * @see #sendAccessibilityEvent(int) 3873 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 3874 */ 3875 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 3876 event.setSource(this); 3877 event.setClassName(getClass().getName()); 3878 event.setPackageName(getContext().getPackageName()); 3879 event.setEnabled(isEnabled()); 3880 event.setContentDescription(mContentDescription); 3881 3882 final int eventType = event.getEventType(); 3883 switch (eventType) { 3884 case AccessibilityEvent.TYPE_VIEW_FOCUSED: { 3885 if (mAttachInfo != null) { 3886 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3887 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 3888 FOCUSABLES_ALL); 3889 event.setItemCount(focusablesTempList.size()); 3890 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3891 focusablesTempList.clear(); 3892 } 3893 } break; 3894 case AccessibilityEvent.TYPE_VIEW_SCROLLED: { 3895 event.setScrollX(mScrollX); 3896 event.setScrollY(mScrollY); 3897 event.setItemCount(getHeight()); 3898 } break; 3899 } 3900 } 3901 3902 /** 3903 * Returns an {@link AccessibilityNodeInfo} representing this view from the 3904 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 3905 * This method is responsible for obtaining an accessibility node info from a 3906 * pool of reusable instances and calling 3907 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 3908 * initialize the former. 3909 * <p> 3910 * Note: The client is responsible for recycling the obtained instance by calling 3911 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 3912 * </p> 3913 * @return A populated {@link AccessibilityNodeInfo}. 3914 * 3915 * @see AccessibilityNodeInfo 3916 */ 3917 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 3918 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 3919 onInitializeAccessibilityNodeInfo(info); 3920 return info; 3921 } 3922 3923 /** 3924 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 3925 * The base implementation sets: 3926 * <ul> 3927 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 3928 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 3929 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 3930 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 3931 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 3932 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 3933 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 3934 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 3935 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 3936 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 3937 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 3938 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 3939 * </ul> 3940 * <p> 3941 * Subclasses should override this method, call the super implementation, 3942 * and set additional attributes. 3943 * </p> 3944 * @param info The instance to initialize. 3945 */ 3946 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 3947 Rect bounds = mAttachInfo.mTmpInvalRect; 3948 getDrawingRect(bounds); 3949 info.setBoundsInParent(bounds); 3950 3951 int[] locationOnScreen = mAttachInfo.mInvalidateChildLocation; 3952 getLocationOnScreen(locationOnScreen); 3953 bounds.offsetTo(0, 0); 3954 bounds.offset(locationOnScreen[0], locationOnScreen[1]); 3955 info.setBoundsInScreen(bounds); 3956 3957 ViewParent parent = getParent(); 3958 if (parent instanceof View) { 3959 View parentView = (View) parent; 3960 info.setParent(parentView); 3961 } 3962 3963 info.setPackageName(mContext.getPackageName()); 3964 info.setClassName(getClass().getName()); 3965 info.setContentDescription(getContentDescription()); 3966 3967 info.setEnabled(isEnabled()); 3968 info.setClickable(isClickable()); 3969 info.setFocusable(isFocusable()); 3970 info.setFocused(isFocused()); 3971 info.setSelected(isSelected()); 3972 info.setLongClickable(isLongClickable()); 3973 3974 // TODO: These make sense only if we are in an AdapterView but all 3975 // views can be selected. Maybe from accessiiblity perspective 3976 // we should report as selectable view in an AdapterView. 3977 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 3978 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 3979 3980 if (isFocusable()) { 3981 if (isFocused()) { 3982 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 3983 } else { 3984 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 3985 } 3986 } 3987 } 3988 3989 /** 3990 * Gets the unique identifier of this view on the screen for accessibility purposes. 3991 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 3992 * 3993 * @return The view accessibility id. 3994 * 3995 * @hide 3996 */ 3997 public int getAccessibilityViewId() { 3998 if (mAccessibilityViewId == NO_ID) { 3999 mAccessibilityViewId = sNextAccessibilityViewId++; 4000 } 4001 return mAccessibilityViewId; 4002 } 4003 4004 /** 4005 * Gets the unique identifier of the window in which this View reseides. 4006 * 4007 * @return The window accessibility id. 4008 * 4009 * @hide 4010 */ 4011 public int getAccessibilityWindowId() { 4012 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4013 } 4014 4015 /** 4016 * Gets the {@link View} description. It briefly describes the view and is 4017 * primarily used for accessibility support. Set this property to enable 4018 * better accessibility support for your application. This is especially 4019 * true for views that do not have textual representation (For example, 4020 * ImageButton). 4021 * 4022 * @return The content descriptiopn. 4023 * 4024 * @attr ref android.R.styleable#View_contentDescription 4025 */ 4026 public CharSequence getContentDescription() { 4027 return mContentDescription; 4028 } 4029 4030 /** 4031 * Sets the {@link View} description. It briefly describes the view and is 4032 * primarily used for accessibility support. Set this property to enable 4033 * better accessibility support for your application. This is especially 4034 * true for views that do not have textual representation (For example, 4035 * ImageButton). 4036 * 4037 * @param contentDescription The content description. 4038 * 4039 * @attr ref android.R.styleable#View_contentDescription 4040 */ 4041 public void setContentDescription(CharSequence contentDescription) { 4042 mContentDescription = contentDescription; 4043 } 4044 4045 /** 4046 * Invoked whenever this view loses focus, either by losing window focus or by losing 4047 * focus within its window. This method can be used to clear any state tied to the 4048 * focus. For instance, if a button is held pressed with the trackball and the window 4049 * loses focus, this method can be used to cancel the press. 4050 * 4051 * Subclasses of View overriding this method should always call super.onFocusLost(). 4052 * 4053 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4054 * @see #onWindowFocusChanged(boolean) 4055 * 4056 * @hide pending API council approval 4057 */ 4058 protected void onFocusLost() { 4059 resetPressedState(); 4060 } 4061 4062 private void resetPressedState() { 4063 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4064 return; 4065 } 4066 4067 if (isPressed()) { 4068 setPressed(false); 4069 4070 if (!mHasPerformedLongPress) { 4071 removeLongPressCallback(); 4072 } 4073 } 4074 } 4075 4076 /** 4077 * Returns true if this view has focus 4078 * 4079 * @return True if this view has focus, false otherwise. 4080 */ 4081 @ViewDebug.ExportedProperty(category = "focus") 4082 public boolean isFocused() { 4083 return (mPrivateFlags & FOCUSED) != 0; 4084 } 4085 4086 /** 4087 * Find the view in the hierarchy rooted at this view that currently has 4088 * focus. 4089 * 4090 * @return The view that currently has focus, or null if no focused view can 4091 * be found. 4092 */ 4093 public View findFocus() { 4094 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4095 } 4096 4097 /** 4098 * Change whether this view is one of the set of scrollable containers in 4099 * its window. This will be used to determine whether the window can 4100 * resize or must pan when a soft input area is open -- scrollable 4101 * containers allow the window to use resize mode since the container 4102 * will appropriately shrink. 4103 */ 4104 public void setScrollContainer(boolean isScrollContainer) { 4105 if (isScrollContainer) { 4106 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4107 mAttachInfo.mScrollContainers.add(this); 4108 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4109 } 4110 mPrivateFlags |= SCROLL_CONTAINER; 4111 } else { 4112 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4113 mAttachInfo.mScrollContainers.remove(this); 4114 } 4115 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4116 } 4117 } 4118 4119 /** 4120 * Returns the quality of the drawing cache. 4121 * 4122 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4123 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4124 * 4125 * @see #setDrawingCacheQuality(int) 4126 * @see #setDrawingCacheEnabled(boolean) 4127 * @see #isDrawingCacheEnabled() 4128 * 4129 * @attr ref android.R.styleable#View_drawingCacheQuality 4130 */ 4131 public int getDrawingCacheQuality() { 4132 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4133 } 4134 4135 /** 4136 * Set the drawing cache quality of this view. This value is used only when the 4137 * drawing cache is enabled 4138 * 4139 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4140 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4141 * 4142 * @see #getDrawingCacheQuality() 4143 * @see #setDrawingCacheEnabled(boolean) 4144 * @see #isDrawingCacheEnabled() 4145 * 4146 * @attr ref android.R.styleable#View_drawingCacheQuality 4147 */ 4148 public void setDrawingCacheQuality(int quality) { 4149 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4150 } 4151 4152 /** 4153 * Returns whether the screen should remain on, corresponding to the current 4154 * value of {@link #KEEP_SCREEN_ON}. 4155 * 4156 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4157 * 4158 * @see #setKeepScreenOn(boolean) 4159 * 4160 * @attr ref android.R.styleable#View_keepScreenOn 4161 */ 4162 public boolean getKeepScreenOn() { 4163 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4164 } 4165 4166 /** 4167 * Controls whether the screen should remain on, modifying the 4168 * value of {@link #KEEP_SCREEN_ON}. 4169 * 4170 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4171 * 4172 * @see #getKeepScreenOn() 4173 * 4174 * @attr ref android.R.styleable#View_keepScreenOn 4175 */ 4176 public void setKeepScreenOn(boolean keepScreenOn) { 4177 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4178 } 4179 4180 /** 4181 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4182 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4183 * 4184 * @attr ref android.R.styleable#View_nextFocusLeft 4185 */ 4186 public int getNextFocusLeftId() { 4187 return mNextFocusLeftId; 4188 } 4189 4190 /** 4191 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4192 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4193 * decide automatically. 4194 * 4195 * @attr ref android.R.styleable#View_nextFocusLeft 4196 */ 4197 public void setNextFocusLeftId(int nextFocusLeftId) { 4198 mNextFocusLeftId = nextFocusLeftId; 4199 } 4200 4201 /** 4202 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4203 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4204 * 4205 * @attr ref android.R.styleable#View_nextFocusRight 4206 */ 4207 public int getNextFocusRightId() { 4208 return mNextFocusRightId; 4209 } 4210 4211 /** 4212 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 4213 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 4214 * decide automatically. 4215 * 4216 * @attr ref android.R.styleable#View_nextFocusRight 4217 */ 4218 public void setNextFocusRightId(int nextFocusRightId) { 4219 mNextFocusRightId = nextFocusRightId; 4220 } 4221 4222 /** 4223 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4224 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4225 * 4226 * @attr ref android.R.styleable#View_nextFocusUp 4227 */ 4228 public int getNextFocusUpId() { 4229 return mNextFocusUpId; 4230 } 4231 4232 /** 4233 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 4234 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 4235 * decide automatically. 4236 * 4237 * @attr ref android.R.styleable#View_nextFocusUp 4238 */ 4239 public void setNextFocusUpId(int nextFocusUpId) { 4240 mNextFocusUpId = nextFocusUpId; 4241 } 4242 4243 /** 4244 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4245 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4246 * 4247 * @attr ref android.R.styleable#View_nextFocusDown 4248 */ 4249 public int getNextFocusDownId() { 4250 return mNextFocusDownId; 4251 } 4252 4253 /** 4254 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 4255 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 4256 * decide automatically. 4257 * 4258 * @attr ref android.R.styleable#View_nextFocusDown 4259 */ 4260 public void setNextFocusDownId(int nextFocusDownId) { 4261 mNextFocusDownId = nextFocusDownId; 4262 } 4263 4264 /** 4265 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4266 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4267 * 4268 * @attr ref android.R.styleable#View_nextFocusForward 4269 */ 4270 public int getNextFocusForwardId() { 4271 return mNextFocusForwardId; 4272 } 4273 4274 /** 4275 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 4276 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 4277 * decide automatically. 4278 * 4279 * @attr ref android.R.styleable#View_nextFocusForward 4280 */ 4281 public void setNextFocusForwardId(int nextFocusForwardId) { 4282 mNextFocusForwardId = nextFocusForwardId; 4283 } 4284 4285 /** 4286 * Returns the visibility of this view and all of its ancestors 4287 * 4288 * @return True if this view and all of its ancestors are {@link #VISIBLE} 4289 */ 4290 public boolean isShown() { 4291 View current = this; 4292 //noinspection ConstantConditions 4293 do { 4294 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4295 return false; 4296 } 4297 ViewParent parent = current.mParent; 4298 if (parent == null) { 4299 return false; // We are not attached to the view root 4300 } 4301 if (!(parent instanceof View)) { 4302 return true; 4303 } 4304 current = (View) parent; 4305 } while (current != null); 4306 4307 return false; 4308 } 4309 4310 /** 4311 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 4312 * is set 4313 * 4314 * @param insets Insets for system windows 4315 * 4316 * @return True if this view applied the insets, false otherwise 4317 */ 4318 protected boolean fitSystemWindows(Rect insets) { 4319 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 4320 mPaddingLeft = insets.left; 4321 mPaddingTop = insets.top; 4322 mPaddingRight = insets.right; 4323 mPaddingBottom = insets.bottom; 4324 requestLayout(); 4325 return true; 4326 } 4327 return false; 4328 } 4329 4330 /** 4331 * Set whether or not this view should account for system screen decorations 4332 * such as the status bar and inset its content. This allows this view to be 4333 * positioned in absolute screen coordinates and remain visible to the user. 4334 * 4335 * <p>This should only be used by top-level window decor views. 4336 * 4337 * @param fitSystemWindows true to inset content for system screen decorations, false for 4338 * default behavior. 4339 * 4340 * @attr ref android.R.styleable#View_fitsSystemWindows 4341 */ 4342 public void setFitsSystemWindows(boolean fitSystemWindows) { 4343 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 4344 } 4345 4346 /** 4347 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 4348 * will account for system screen decorations such as the status bar and inset its 4349 * content. This allows the view to be positioned in absolute screen coordinates 4350 * and remain visible to the user. 4351 * 4352 * @return true if this view will adjust its content bounds for system screen decorations. 4353 * 4354 * @attr ref android.R.styleable#View_fitsSystemWindows 4355 */ 4356 public boolean fitsSystemWindows() { 4357 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 4358 } 4359 4360 /** 4361 * Returns the visibility status for this view. 4362 * 4363 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4364 * @attr ref android.R.styleable#View_visibility 4365 */ 4366 @ViewDebug.ExportedProperty(mapping = { 4367 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 4368 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 4369 @ViewDebug.IntToString(from = GONE, to = "GONE") 4370 }) 4371 public int getVisibility() { 4372 return mViewFlags & VISIBILITY_MASK; 4373 } 4374 4375 /** 4376 * Set the enabled state of this view. 4377 * 4378 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 4379 * @attr ref android.R.styleable#View_visibility 4380 */ 4381 @RemotableViewMethod 4382 public void setVisibility(int visibility) { 4383 setFlags(visibility, VISIBILITY_MASK); 4384 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 4385 } 4386 4387 /** 4388 * Returns the enabled status for this view. The interpretation of the 4389 * enabled state varies by subclass. 4390 * 4391 * @return True if this view is enabled, false otherwise. 4392 */ 4393 @ViewDebug.ExportedProperty 4394 public boolean isEnabled() { 4395 return (mViewFlags & ENABLED_MASK) == ENABLED; 4396 } 4397 4398 /** 4399 * Set the enabled state of this view. The interpretation of the enabled 4400 * state varies by subclass. 4401 * 4402 * @param enabled True if this view is enabled, false otherwise. 4403 */ 4404 @RemotableViewMethod 4405 public void setEnabled(boolean enabled) { 4406 if (enabled == isEnabled()) return; 4407 4408 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 4409 4410 /* 4411 * The View most likely has to change its appearance, so refresh 4412 * the drawable state. 4413 */ 4414 refreshDrawableState(); 4415 4416 // Invalidate too, since the default behavior for views is to be 4417 // be drawn at 50% alpha rather than to change the drawable. 4418 invalidate(true); 4419 } 4420 4421 /** 4422 * Set whether this view can receive the focus. 4423 * 4424 * Setting this to false will also ensure that this view is not focusable 4425 * in touch mode. 4426 * 4427 * @param focusable If true, this view can receive the focus. 4428 * 4429 * @see #setFocusableInTouchMode(boolean) 4430 * @attr ref android.R.styleable#View_focusable 4431 */ 4432 public void setFocusable(boolean focusable) { 4433 if (!focusable) { 4434 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 4435 } 4436 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 4437 } 4438 4439 /** 4440 * Set whether this view can receive focus while in touch mode. 4441 * 4442 * Setting this to true will also ensure that this view is focusable. 4443 * 4444 * @param focusableInTouchMode If true, this view can receive the focus while 4445 * in touch mode. 4446 * 4447 * @see #setFocusable(boolean) 4448 * @attr ref android.R.styleable#View_focusableInTouchMode 4449 */ 4450 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 4451 // Focusable in touch mode should always be set before the focusable flag 4452 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 4453 // which, in touch mode, will not successfully request focus on this view 4454 // because the focusable in touch mode flag is not set 4455 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 4456 if (focusableInTouchMode) { 4457 setFlags(FOCUSABLE, FOCUSABLE_MASK); 4458 } 4459 } 4460 4461 /** 4462 * Set whether this view should have sound effects enabled for events such as 4463 * clicking and touching. 4464 * 4465 * <p>You may wish to disable sound effects for a view if you already play sounds, 4466 * for instance, a dial key that plays dtmf tones. 4467 * 4468 * @param soundEffectsEnabled whether sound effects are enabled for this view. 4469 * @see #isSoundEffectsEnabled() 4470 * @see #playSoundEffect(int) 4471 * @attr ref android.R.styleable#View_soundEffectsEnabled 4472 */ 4473 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 4474 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 4475 } 4476 4477 /** 4478 * @return whether this view should have sound effects enabled for events such as 4479 * clicking and touching. 4480 * 4481 * @see #setSoundEffectsEnabled(boolean) 4482 * @see #playSoundEffect(int) 4483 * @attr ref android.R.styleable#View_soundEffectsEnabled 4484 */ 4485 @ViewDebug.ExportedProperty 4486 public boolean isSoundEffectsEnabled() { 4487 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 4488 } 4489 4490 /** 4491 * Set whether this view should have haptic feedback for events such as 4492 * long presses. 4493 * 4494 * <p>You may wish to disable haptic feedback if your view already controls 4495 * its own haptic feedback. 4496 * 4497 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 4498 * @see #isHapticFeedbackEnabled() 4499 * @see #performHapticFeedback(int) 4500 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4501 */ 4502 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 4503 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 4504 } 4505 4506 /** 4507 * @return whether this view should have haptic feedback enabled for events 4508 * long presses. 4509 * 4510 * @see #setHapticFeedbackEnabled(boolean) 4511 * @see #performHapticFeedback(int) 4512 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 4513 */ 4514 @ViewDebug.ExportedProperty 4515 public boolean isHapticFeedbackEnabled() { 4516 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 4517 } 4518 4519 /** 4520 * Returns the layout direction for this view. 4521 * 4522 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 4523 * {@link #LAYOUT_DIRECTION_RTL}, 4524 * {@link #LAYOUT_DIRECTION_INHERIT} or 4525 * {@link #LAYOUT_DIRECTION_LOCALE}. 4526 * @attr ref android.R.styleable#View_layoutDirection 4527 * 4528 * @hide 4529 */ 4530 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4531 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 4532 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 4533 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 4534 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 4535 }) 4536 public int getLayoutDirection() { 4537 return mViewFlags & LAYOUT_DIRECTION_MASK; 4538 } 4539 4540 /** 4541 * Set the layout direction for this view. This will propagate a reset of layout direction 4542 * resolution to the view's children and resolve layout direction for this view. 4543 * 4544 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 4545 * {@link #LAYOUT_DIRECTION_RTL}, 4546 * {@link #LAYOUT_DIRECTION_INHERIT} or 4547 * {@link #LAYOUT_DIRECTION_LOCALE}. 4548 * 4549 * @attr ref android.R.styleable#View_layoutDirection 4550 * 4551 * @hide 4552 */ 4553 @RemotableViewMethod 4554 public void setLayoutDirection(int layoutDirection) { 4555 if (getLayoutDirection() != layoutDirection) { 4556 resetResolvedLayoutDirection(); 4557 // Setting the flag will also request a layout. 4558 setFlags(layoutDirection, LAYOUT_DIRECTION_MASK); 4559 } 4560 } 4561 4562 /** 4563 * Returns the resolved layout direction for this view. 4564 * 4565 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 4566 * {@link #LAYOUT_DIRECTION_LTR} id the layout direction is not RTL. 4567 * 4568 * @hide 4569 */ 4570 @ViewDebug.ExportedProperty(category = "layout", mapping = { 4571 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 4572 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 4573 }) 4574 public int getResolvedLayoutDirection() { 4575 resolveLayoutDirectionIfNeeded(); 4576 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 4577 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 4578 } 4579 4580 /** 4581 * <p>Indicates whether or not this view's layout is right-to-left. This is resolved from 4582 * layout attribute and/or the inherited value from the parent.</p> 4583 * 4584 * @return true if the layout is right-to-left. 4585 * 4586 * @hide 4587 */ 4588 @ViewDebug.ExportedProperty(category = "layout") 4589 public boolean isLayoutRtl() { 4590 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 4591 } 4592 4593 /** 4594 * If this view doesn't do any drawing on its own, set this flag to 4595 * allow further optimizations. By default, this flag is not set on 4596 * View, but could be set on some View subclasses such as ViewGroup. 4597 * 4598 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 4599 * you should clear this flag. 4600 * 4601 * @param willNotDraw whether or not this View draw on its own 4602 */ 4603 public void setWillNotDraw(boolean willNotDraw) { 4604 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 4605 } 4606 4607 /** 4608 * Returns whether or not this View draws on its own. 4609 * 4610 * @return true if this view has nothing to draw, false otherwise 4611 */ 4612 @ViewDebug.ExportedProperty(category = "drawing") 4613 public boolean willNotDraw() { 4614 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 4615 } 4616 4617 /** 4618 * When a View's drawing cache is enabled, drawing is redirected to an 4619 * offscreen bitmap. Some views, like an ImageView, must be able to 4620 * bypass this mechanism if they already draw a single bitmap, to avoid 4621 * unnecessary usage of the memory. 4622 * 4623 * @param willNotCacheDrawing true if this view does not cache its 4624 * drawing, false otherwise 4625 */ 4626 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 4627 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 4628 } 4629 4630 /** 4631 * Returns whether or not this View can cache its drawing or not. 4632 * 4633 * @return true if this view does not cache its drawing, false otherwise 4634 */ 4635 @ViewDebug.ExportedProperty(category = "drawing") 4636 public boolean willNotCacheDrawing() { 4637 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 4638 } 4639 4640 /** 4641 * Indicates whether this view reacts to click events or not. 4642 * 4643 * @return true if the view is clickable, false otherwise 4644 * 4645 * @see #setClickable(boolean) 4646 * @attr ref android.R.styleable#View_clickable 4647 */ 4648 @ViewDebug.ExportedProperty 4649 public boolean isClickable() { 4650 return (mViewFlags & CLICKABLE) == CLICKABLE; 4651 } 4652 4653 /** 4654 * Enables or disables click events for this view. When a view 4655 * is clickable it will change its state to "pressed" on every click. 4656 * Subclasses should set the view clickable to visually react to 4657 * user's clicks. 4658 * 4659 * @param clickable true to make the view clickable, false otherwise 4660 * 4661 * @see #isClickable() 4662 * @attr ref android.R.styleable#View_clickable 4663 */ 4664 public void setClickable(boolean clickable) { 4665 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 4666 } 4667 4668 /** 4669 * Indicates whether this view reacts to long click events or not. 4670 * 4671 * @return true if the view is long clickable, false otherwise 4672 * 4673 * @see #setLongClickable(boolean) 4674 * @attr ref android.R.styleable#View_longClickable 4675 */ 4676 public boolean isLongClickable() { 4677 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4678 } 4679 4680 /** 4681 * Enables or disables long click events for this view. When a view is long 4682 * clickable it reacts to the user holding down the button for a longer 4683 * duration than a tap. This event can either launch the listener or a 4684 * context menu. 4685 * 4686 * @param longClickable true to make the view long clickable, false otherwise 4687 * @see #isLongClickable() 4688 * @attr ref android.R.styleable#View_longClickable 4689 */ 4690 public void setLongClickable(boolean longClickable) { 4691 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4692 } 4693 4694 /** 4695 * Sets the pressed state for this view. 4696 * 4697 * @see #isClickable() 4698 * @see #setClickable(boolean) 4699 * 4700 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4701 * the View's internal state from a previously set "pressed" state. 4702 */ 4703 public void setPressed(boolean pressed) { 4704 if (pressed) { 4705 mPrivateFlags |= PRESSED; 4706 } else { 4707 mPrivateFlags &= ~PRESSED; 4708 } 4709 refreshDrawableState(); 4710 dispatchSetPressed(pressed); 4711 } 4712 4713 /** 4714 * Dispatch setPressed to all of this View's children. 4715 * 4716 * @see #setPressed(boolean) 4717 * 4718 * @param pressed The new pressed state 4719 */ 4720 protected void dispatchSetPressed(boolean pressed) { 4721 } 4722 4723 /** 4724 * Indicates whether the view is currently in pressed state. Unless 4725 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 4726 * the pressed state. 4727 * 4728 * @see #setPressed(boolean) 4729 * @see #isClickable() 4730 * @see #setClickable(boolean) 4731 * 4732 * @return true if the view is currently pressed, false otherwise 4733 */ 4734 public boolean isPressed() { 4735 return (mPrivateFlags & PRESSED) == PRESSED; 4736 } 4737 4738 /** 4739 * Indicates whether this view will save its state (that is, 4740 * whether its {@link #onSaveInstanceState} method will be called). 4741 * 4742 * @return Returns true if the view state saving is enabled, else false. 4743 * 4744 * @see #setSaveEnabled(boolean) 4745 * @attr ref android.R.styleable#View_saveEnabled 4746 */ 4747 public boolean isSaveEnabled() { 4748 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 4749 } 4750 4751 /** 4752 * Controls whether the saving of this view's state is 4753 * enabled (that is, whether its {@link #onSaveInstanceState} method 4754 * will be called). Note that even if freezing is enabled, the 4755 * view still must have an id assigned to it (via {@link #setId(int)}) 4756 * for its state to be saved. This flag can only disable the 4757 * saving of this view; any child views may still have their state saved. 4758 * 4759 * @param enabled Set to false to <em>disable</em> state saving, or true 4760 * (the default) to allow it. 4761 * 4762 * @see #isSaveEnabled() 4763 * @see #setId(int) 4764 * @see #onSaveInstanceState() 4765 * @attr ref android.R.styleable#View_saveEnabled 4766 */ 4767 public void setSaveEnabled(boolean enabled) { 4768 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 4769 } 4770 4771 /** 4772 * Gets whether the framework should discard touches when the view's 4773 * window is obscured by another visible window. 4774 * Refer to the {@link View} security documentation for more details. 4775 * 4776 * @return True if touch filtering is enabled. 4777 * 4778 * @see #setFilterTouchesWhenObscured(boolean) 4779 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4780 */ 4781 @ViewDebug.ExportedProperty 4782 public boolean getFilterTouchesWhenObscured() { 4783 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4784 } 4785 4786 /** 4787 * Sets whether the framework should discard touches when the view's 4788 * window is obscured by another visible window. 4789 * Refer to the {@link View} security documentation for more details. 4790 * 4791 * @param enabled True if touch filtering should be enabled. 4792 * 4793 * @see #getFilterTouchesWhenObscured 4794 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4795 */ 4796 public void setFilterTouchesWhenObscured(boolean enabled) { 4797 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4798 FILTER_TOUCHES_WHEN_OBSCURED); 4799 } 4800 4801 /** 4802 * Indicates whether the entire hierarchy under this view will save its 4803 * state when a state saving traversal occurs from its parent. The default 4804 * is true; if false, these views will not be saved unless 4805 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4806 * 4807 * @return Returns true if the view state saving from parent is enabled, else false. 4808 * 4809 * @see #setSaveFromParentEnabled(boolean) 4810 */ 4811 public boolean isSaveFromParentEnabled() { 4812 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4813 } 4814 4815 /** 4816 * Controls whether the entire hierarchy under this view will save its 4817 * state when a state saving traversal occurs from its parent. The default 4818 * is true; if false, these views will not be saved unless 4819 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4820 * 4821 * @param enabled Set to false to <em>disable</em> state saving, or true 4822 * (the default) to allow it. 4823 * 4824 * @see #isSaveFromParentEnabled() 4825 * @see #setId(int) 4826 * @see #onSaveInstanceState() 4827 */ 4828 public void setSaveFromParentEnabled(boolean enabled) { 4829 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4830 } 4831 4832 4833 /** 4834 * Returns whether this View is able to take focus. 4835 * 4836 * @return True if this view can take focus, or false otherwise. 4837 * @attr ref android.R.styleable#View_focusable 4838 */ 4839 @ViewDebug.ExportedProperty(category = "focus") 4840 public final boolean isFocusable() { 4841 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4842 } 4843 4844 /** 4845 * When a view is focusable, it may not want to take focus when in touch mode. 4846 * For example, a button would like focus when the user is navigating via a D-pad 4847 * so that the user can click on it, but once the user starts touching the screen, 4848 * the button shouldn't take focus 4849 * @return Whether the view is focusable in touch mode. 4850 * @attr ref android.R.styleable#View_focusableInTouchMode 4851 */ 4852 @ViewDebug.ExportedProperty 4853 public final boolean isFocusableInTouchMode() { 4854 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4855 } 4856 4857 /** 4858 * Find the nearest view in the specified direction that can take focus. 4859 * This does not actually give focus to that view. 4860 * 4861 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4862 * 4863 * @return The nearest focusable in the specified direction, or null if none 4864 * can be found. 4865 */ 4866 public View focusSearch(int direction) { 4867 if (mParent != null) { 4868 return mParent.focusSearch(this, direction); 4869 } else { 4870 return null; 4871 } 4872 } 4873 4874 /** 4875 * This method is the last chance for the focused view and its ancestors to 4876 * respond to an arrow key. This is called when the focused view did not 4877 * consume the key internally, nor could the view system find a new view in 4878 * the requested direction to give focus to. 4879 * 4880 * @param focused The currently focused view. 4881 * @param direction The direction focus wants to move. One of FOCUS_UP, 4882 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4883 * @return True if the this view consumed this unhandled move. 4884 */ 4885 public boolean dispatchUnhandledMove(View focused, int direction) { 4886 return false; 4887 } 4888 4889 /** 4890 * If a user manually specified the next view id for a particular direction, 4891 * use the root to look up the view. 4892 * @param root The root view of the hierarchy containing this view. 4893 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4894 * or FOCUS_BACKWARD. 4895 * @return The user specified next view, or null if there is none. 4896 */ 4897 View findUserSetNextFocus(View root, int direction) { 4898 switch (direction) { 4899 case FOCUS_LEFT: 4900 if (mNextFocusLeftId == View.NO_ID) return null; 4901 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 4902 case FOCUS_RIGHT: 4903 if (mNextFocusRightId == View.NO_ID) return null; 4904 return findViewInsideOutShouldExist(root, mNextFocusRightId); 4905 case FOCUS_UP: 4906 if (mNextFocusUpId == View.NO_ID) return null; 4907 return findViewInsideOutShouldExist(root, mNextFocusUpId); 4908 case FOCUS_DOWN: 4909 if (mNextFocusDownId == View.NO_ID) return null; 4910 return findViewInsideOutShouldExist(root, mNextFocusDownId); 4911 case FOCUS_FORWARD: 4912 if (mNextFocusForwardId == View.NO_ID) return null; 4913 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 4914 case FOCUS_BACKWARD: { 4915 final int id = mID; 4916 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 4917 @Override 4918 public boolean apply(View t) { 4919 return t.mNextFocusForwardId == id; 4920 } 4921 }); 4922 } 4923 } 4924 return null; 4925 } 4926 4927 private View findViewInsideOutShouldExist(View root, final int childViewId) { 4928 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 4929 @Override 4930 public boolean apply(View t) { 4931 return t.mID == childViewId; 4932 } 4933 }); 4934 4935 if (result == null) { 4936 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4937 + "by user for id " + childViewId); 4938 } 4939 return result; 4940 } 4941 4942 /** 4943 * Find and return all focusable views that are descendants of this view, 4944 * possibly including this view if it is focusable itself. 4945 * 4946 * @param direction The direction of the focus 4947 * @return A list of focusable views 4948 */ 4949 public ArrayList<View> getFocusables(int direction) { 4950 ArrayList<View> result = new ArrayList<View>(24); 4951 addFocusables(result, direction); 4952 return result; 4953 } 4954 4955 /** 4956 * Add any focusable views that are descendants of this view (possibly 4957 * including this view if it is focusable itself) to views. If we are in touch mode, 4958 * only add views that are also focusable in touch mode. 4959 * 4960 * @param views Focusable views found so far 4961 * @param direction The direction of the focus 4962 */ 4963 public void addFocusables(ArrayList<View> views, int direction) { 4964 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4965 } 4966 4967 /** 4968 * Adds any focusable views that are descendants of this view (possibly 4969 * including this view if it is focusable itself) to views. This method 4970 * adds all focusable views regardless if we are in touch mode or 4971 * only views focusable in touch mode if we are in touch mode depending on 4972 * the focusable mode paramater. 4973 * 4974 * @param views Focusable views found so far or null if all we are interested is 4975 * the number of focusables. 4976 * @param direction The direction of the focus. 4977 * @param focusableMode The type of focusables to be added. 4978 * 4979 * @see #FOCUSABLES_ALL 4980 * @see #FOCUSABLES_TOUCH_MODE 4981 */ 4982 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4983 if (!isFocusable()) { 4984 return; 4985 } 4986 4987 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4988 isInTouchMode() && !isFocusableInTouchMode()) { 4989 return; 4990 } 4991 4992 if (views != null) { 4993 views.add(this); 4994 } 4995 } 4996 4997 /** 4998 * Finds the Views that contain given text. The containment is case insensitive. 4999 * As View's text is considered any text content that View renders. 5000 * 5001 * @param outViews The output list of matching Views. 5002 * @param text The text to match against. 5003 */ 5004 public void findViewsWithText(ArrayList<View> outViews, CharSequence text) { 5005 } 5006 5007 /** 5008 * Find and return all touchable views that are descendants of this view, 5009 * possibly including this view if it is touchable itself. 5010 * 5011 * @return A list of touchable views 5012 */ 5013 public ArrayList<View> getTouchables() { 5014 ArrayList<View> result = new ArrayList<View>(); 5015 addTouchables(result); 5016 return result; 5017 } 5018 5019 /** 5020 * Add any touchable views that are descendants of this view (possibly 5021 * including this view if it is touchable itself) to views. 5022 * 5023 * @param views Touchable views found so far 5024 */ 5025 public void addTouchables(ArrayList<View> views) { 5026 final int viewFlags = mViewFlags; 5027 5028 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5029 && (viewFlags & ENABLED_MASK) == ENABLED) { 5030 views.add(this); 5031 } 5032 } 5033 5034 /** 5035 * Call this to try to give focus to a specific view or to one of its 5036 * descendants. 5037 * 5038 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5039 * false), or if it is focusable and it is not focusable in touch mode 5040 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5041 * 5042 * See also {@link #focusSearch(int)}, which is what you call to say that you 5043 * have focus, and you want your parent to look for the next one. 5044 * 5045 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 5046 * {@link #FOCUS_DOWN} and <code>null</code>. 5047 * 5048 * @return Whether this view or one of its descendants actually took focus. 5049 */ 5050 public final boolean requestFocus() { 5051 return requestFocus(View.FOCUS_DOWN); 5052 } 5053 5054 5055 /** 5056 * Call this to try to give focus to a specific view or to one of its 5057 * descendants and give it a hint about what direction focus is heading. 5058 * 5059 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5060 * false), or if it is focusable and it is not focusable in touch mode 5061 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5062 * 5063 * See also {@link #focusSearch(int)}, which is what you call to say that you 5064 * have focus, and you want your parent to look for the next one. 5065 * 5066 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 5067 * <code>null</code> set for the previously focused rectangle. 5068 * 5069 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5070 * @return Whether this view or one of its descendants actually took focus. 5071 */ 5072 public final boolean requestFocus(int direction) { 5073 return requestFocus(direction, null); 5074 } 5075 5076 /** 5077 * Call this to try to give focus to a specific view or to one of its descendants 5078 * and give it hints about the direction and a specific rectangle that the focus 5079 * is coming from. The rectangle can help give larger views a finer grained hint 5080 * about where focus is coming from, and therefore, where to show selection, or 5081 * forward focus change internally. 5082 * 5083 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 5084 * false), or if it is focusable and it is not focusable in touch mode 5085 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 5086 * 5087 * A View will not take focus if it is not visible. 5088 * 5089 * A View will not take focus if one of its parents has 5090 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 5091 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 5092 * 5093 * See also {@link #focusSearch(int)}, which is what you call to say that you 5094 * have focus, and you want your parent to look for the next one. 5095 * 5096 * You may wish to override this method if your custom {@link View} has an internal 5097 * {@link View} that it wishes to forward the request to. 5098 * 5099 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5100 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 5101 * to give a finer grained hint about where focus is coming from. May be null 5102 * if there is no hint. 5103 * @return Whether this view or one of its descendants actually took focus. 5104 */ 5105 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 5106 // need to be focusable 5107 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 5108 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5109 return false; 5110 } 5111 5112 // need to be focusable in touch mode if in touch mode 5113 if (isInTouchMode() && 5114 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 5115 return false; 5116 } 5117 5118 // need to not have any parents blocking us 5119 if (hasAncestorThatBlocksDescendantFocus()) { 5120 return false; 5121 } 5122 5123 handleFocusGainInternal(direction, previouslyFocusedRect); 5124 return true; 5125 } 5126 5127 /** Gets the ViewAncestor, or null if not attached. */ 5128 /*package*/ ViewRootImpl getViewRootImpl() { 5129 View root = getRootView(); 5130 return root != null ? (ViewRootImpl)root.getParent() : null; 5131 } 5132 5133 /** 5134 * Call this to try to give focus to a specific view or to one of its descendants. This is a 5135 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 5136 * touch mode to request focus when they are touched. 5137 * 5138 * @return Whether this view or one of its descendants actually took focus. 5139 * 5140 * @see #isInTouchMode() 5141 * 5142 */ 5143 public final boolean requestFocusFromTouch() { 5144 // Leave touch mode if we need to 5145 if (isInTouchMode()) { 5146 ViewRootImpl viewRoot = getViewRootImpl(); 5147 if (viewRoot != null) { 5148 viewRoot.ensureTouchMode(false); 5149 } 5150 } 5151 return requestFocus(View.FOCUS_DOWN); 5152 } 5153 5154 /** 5155 * @return Whether any ancestor of this view blocks descendant focus. 5156 */ 5157 private boolean hasAncestorThatBlocksDescendantFocus() { 5158 ViewParent ancestor = mParent; 5159 while (ancestor instanceof ViewGroup) { 5160 final ViewGroup vgAncestor = (ViewGroup) ancestor; 5161 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 5162 return true; 5163 } else { 5164 ancestor = vgAncestor.getParent(); 5165 } 5166 } 5167 return false; 5168 } 5169 5170 /** 5171 * @hide 5172 */ 5173 public void dispatchStartTemporaryDetach() { 5174 onStartTemporaryDetach(); 5175 } 5176 5177 /** 5178 * This is called when a container is going to temporarily detach a child, with 5179 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 5180 * It will either be followed by {@link #onFinishTemporaryDetach()} or 5181 * {@link #onDetachedFromWindow()} when the container is done. 5182 */ 5183 public void onStartTemporaryDetach() { 5184 removeUnsetPressCallback(); 5185 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 5186 } 5187 5188 /** 5189 * @hide 5190 */ 5191 public void dispatchFinishTemporaryDetach() { 5192 onFinishTemporaryDetach(); 5193 } 5194 5195 /** 5196 * Called after {@link #onStartTemporaryDetach} when the container is done 5197 * changing the view. 5198 */ 5199 public void onFinishTemporaryDetach() { 5200 } 5201 5202 /** 5203 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 5204 * for this view's window. Returns null if the view is not currently attached 5205 * to the window. Normally you will not need to use this directly, but 5206 * just use the standard high-level event callbacks like 5207 * {@link #onKeyDown(int, KeyEvent)}. 5208 */ 5209 public KeyEvent.DispatcherState getKeyDispatcherState() { 5210 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 5211 } 5212 5213 /** 5214 * Dispatch a key event before it is processed by any input method 5215 * associated with the view hierarchy. This can be used to intercept 5216 * key events in special situations before the IME consumes them; a 5217 * typical example would be handling the BACK key to update the application's 5218 * UI instead of allowing the IME to see it and close itself. 5219 * 5220 * @param event The key event to be dispatched. 5221 * @return True if the event was handled, false otherwise. 5222 */ 5223 public boolean dispatchKeyEventPreIme(KeyEvent event) { 5224 return onKeyPreIme(event.getKeyCode(), event); 5225 } 5226 5227 /** 5228 * Dispatch a key event to the next view on the focus path. This path runs 5229 * from the top of the view tree down to the currently focused view. If this 5230 * view has focus, it will dispatch to itself. Otherwise it will dispatch 5231 * the next node down the focus path. This method also fires any key 5232 * listeners. 5233 * 5234 * @param event The key event to be dispatched. 5235 * @return True if the event was handled, false otherwise. 5236 */ 5237 public boolean dispatchKeyEvent(KeyEvent event) { 5238 if (mInputEventConsistencyVerifier != null) { 5239 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 5240 } 5241 5242 // Give any attached key listener a first crack at the event. 5243 //noinspection SimplifiableIfStatement 5244 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5245 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 5246 return true; 5247 } 5248 5249 if (event.dispatch(this, mAttachInfo != null 5250 ? mAttachInfo.mKeyDispatchState : null, this)) { 5251 return true; 5252 } 5253 5254 if (mInputEventConsistencyVerifier != null) { 5255 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5256 } 5257 return false; 5258 } 5259 5260 /** 5261 * Dispatches a key shortcut event. 5262 * 5263 * @param event The key event to be dispatched. 5264 * @return True if the event was handled by the view, false otherwise. 5265 */ 5266 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 5267 return onKeyShortcut(event.getKeyCode(), event); 5268 } 5269 5270 /** 5271 * Pass the touch screen motion event down to the target view, or this 5272 * view if it is the target. 5273 * 5274 * @param event The motion event to be dispatched. 5275 * @return True if the event was handled by the view, false otherwise. 5276 */ 5277 public boolean dispatchTouchEvent(MotionEvent event) { 5278 if (mInputEventConsistencyVerifier != null) { 5279 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 5280 } 5281 5282 if (onFilterTouchEventForSecurity(event)) { 5283 //noinspection SimplifiableIfStatement 5284 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 5285 mOnTouchListener.onTouch(this, event)) { 5286 return true; 5287 } 5288 5289 if (onTouchEvent(event)) { 5290 return true; 5291 } 5292 } 5293 5294 if (mInputEventConsistencyVerifier != null) { 5295 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5296 } 5297 return false; 5298 } 5299 5300 /** 5301 * Filter the touch event to apply security policies. 5302 * 5303 * @param event The motion event to be filtered. 5304 * @return True if the event should be dispatched, false if the event should be dropped. 5305 * 5306 * @see #getFilterTouchesWhenObscured 5307 */ 5308 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 5309 //noinspection RedundantIfStatement 5310 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 5311 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 5312 // Window is obscured, drop this touch. 5313 return false; 5314 } 5315 return true; 5316 } 5317 5318 /** 5319 * Pass a trackball motion event down to the focused view. 5320 * 5321 * @param event The motion event to be dispatched. 5322 * @return True if the event was handled by the view, false otherwise. 5323 */ 5324 public boolean dispatchTrackballEvent(MotionEvent event) { 5325 if (mInputEventConsistencyVerifier != null) { 5326 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 5327 } 5328 5329 return onTrackballEvent(event); 5330 } 5331 5332 /** 5333 * Dispatch a generic motion event. 5334 * <p> 5335 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5336 * are delivered to the view under the pointer. All other generic motion events are 5337 * delivered to the focused view. Hover events are handled specially and are delivered 5338 * to {@link #onHoverEvent(MotionEvent)}. 5339 * </p> 5340 * 5341 * @param event The motion event to be dispatched. 5342 * @return True if the event was handled by the view, false otherwise. 5343 */ 5344 public boolean dispatchGenericMotionEvent(MotionEvent event) { 5345 if (mInputEventConsistencyVerifier != null) { 5346 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 5347 } 5348 5349 final int source = event.getSource(); 5350 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5351 final int action = event.getAction(); 5352 if (action == MotionEvent.ACTION_HOVER_ENTER 5353 || action == MotionEvent.ACTION_HOVER_MOVE 5354 || action == MotionEvent.ACTION_HOVER_EXIT) { 5355 if (dispatchHoverEvent(event)) { 5356 return true; 5357 } 5358 } else if (dispatchGenericPointerEvent(event)) { 5359 return true; 5360 } 5361 } else if (dispatchGenericFocusedEvent(event)) { 5362 return true; 5363 } 5364 5365 if (dispatchGenericMotionEventInternal(event)) { 5366 return true; 5367 } 5368 5369 if (mInputEventConsistencyVerifier != null) { 5370 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5371 } 5372 return false; 5373 } 5374 5375 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 5376 //noinspection SimplifiableIfStatement 5377 if (mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5378 && mOnGenericMotionListener.onGenericMotion(this, event)) { 5379 return true; 5380 } 5381 5382 if (onGenericMotionEvent(event)) { 5383 return true; 5384 } 5385 5386 if (mInputEventConsistencyVerifier != null) { 5387 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 5388 } 5389 return false; 5390 } 5391 5392 /** 5393 * Dispatch a hover event. 5394 * <p> 5395 * Do not call this method directly. 5396 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5397 * </p> 5398 * 5399 * @param event The motion event to be dispatched. 5400 * @return True if the event was handled by the view, false otherwise. 5401 */ 5402 protected boolean dispatchHoverEvent(MotionEvent event) { 5403 //noinspection SimplifiableIfStatement 5404 if (mOnHoverListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 5405 && mOnHoverListener.onHover(this, event)) { 5406 return true; 5407 } 5408 5409 return onHoverEvent(event); 5410 } 5411 5412 /** 5413 * Returns true if the view has a child to which it has recently sent 5414 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 5415 * it does not have a hovered child, then it must be the innermost hovered view. 5416 * @hide 5417 */ 5418 protected boolean hasHoveredChild() { 5419 return false; 5420 } 5421 5422 /** 5423 * Dispatch a generic motion event to the view under the first pointer. 5424 * <p> 5425 * Do not call this method directly. 5426 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5427 * </p> 5428 * 5429 * @param event The motion event to be dispatched. 5430 * @return True if the event was handled by the view, false otherwise. 5431 */ 5432 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 5433 return false; 5434 } 5435 5436 /** 5437 * Dispatch a generic motion event to the currently focused view. 5438 * <p> 5439 * Do not call this method directly. 5440 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 5441 * </p> 5442 * 5443 * @param event The motion event to be dispatched. 5444 * @return True if the event was handled by the view, false otherwise. 5445 */ 5446 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 5447 return false; 5448 } 5449 5450 /** 5451 * Dispatch a pointer event. 5452 * <p> 5453 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 5454 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 5455 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 5456 * and should not be expected to handle other pointing device features. 5457 * </p> 5458 * 5459 * @param event The motion event to be dispatched. 5460 * @return True if the event was handled by the view, false otherwise. 5461 * @hide 5462 */ 5463 public final boolean dispatchPointerEvent(MotionEvent event) { 5464 if (event.isTouchEvent()) { 5465 return dispatchTouchEvent(event); 5466 } else { 5467 return dispatchGenericMotionEvent(event); 5468 } 5469 } 5470 5471 /** 5472 * Called when the window containing this view gains or loses window focus. 5473 * ViewGroups should override to route to their children. 5474 * 5475 * @param hasFocus True if the window containing this view now has focus, 5476 * false otherwise. 5477 */ 5478 public void dispatchWindowFocusChanged(boolean hasFocus) { 5479 onWindowFocusChanged(hasFocus); 5480 } 5481 5482 /** 5483 * Called when the window containing this view gains or loses focus. Note 5484 * that this is separate from view focus: to receive key events, both 5485 * your view and its window must have focus. If a window is displayed 5486 * on top of yours that takes input focus, then your own window will lose 5487 * focus but the view focus will remain unchanged. 5488 * 5489 * @param hasWindowFocus True if the window containing this view now has 5490 * focus, false otherwise. 5491 */ 5492 public void onWindowFocusChanged(boolean hasWindowFocus) { 5493 InputMethodManager imm = InputMethodManager.peekInstance(); 5494 if (!hasWindowFocus) { 5495 if (isPressed()) { 5496 setPressed(false); 5497 } 5498 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5499 imm.focusOut(this); 5500 } 5501 removeLongPressCallback(); 5502 removeTapCallback(); 5503 onFocusLost(); 5504 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 5505 imm.focusIn(this); 5506 } 5507 refreshDrawableState(); 5508 } 5509 5510 /** 5511 * Returns true if this view is in a window that currently has window focus. 5512 * Note that this is not the same as the view itself having focus. 5513 * 5514 * @return True if this view is in a window that currently has window focus. 5515 */ 5516 public boolean hasWindowFocus() { 5517 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 5518 } 5519 5520 /** 5521 * Dispatch a view visibility change down the view hierarchy. 5522 * ViewGroups should override to route to their children. 5523 * @param changedView The view whose visibility changed. Could be 'this' or 5524 * an ancestor view. 5525 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5526 * {@link #INVISIBLE} or {@link #GONE}. 5527 */ 5528 protected void dispatchVisibilityChanged(View changedView, int visibility) { 5529 onVisibilityChanged(changedView, visibility); 5530 } 5531 5532 /** 5533 * Called when the visibility of the view or an ancestor of the view is changed. 5534 * @param changedView The view whose visibility changed. Could be 'this' or 5535 * an ancestor view. 5536 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 5537 * {@link #INVISIBLE} or {@link #GONE}. 5538 */ 5539 protected void onVisibilityChanged(View changedView, int visibility) { 5540 if (visibility == VISIBLE) { 5541 if (mAttachInfo != null) { 5542 initialAwakenScrollBars(); 5543 } else { 5544 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 5545 } 5546 } 5547 } 5548 5549 /** 5550 * Dispatch a hint about whether this view is displayed. For instance, when 5551 * a View moves out of the screen, it might receives a display hint indicating 5552 * the view is not displayed. Applications should not <em>rely</em> on this hint 5553 * as there is no guarantee that they will receive one. 5554 * 5555 * @param hint A hint about whether or not this view is displayed: 5556 * {@link #VISIBLE} or {@link #INVISIBLE}. 5557 */ 5558 public void dispatchDisplayHint(int hint) { 5559 onDisplayHint(hint); 5560 } 5561 5562 /** 5563 * Gives this view a hint about whether is displayed or not. For instance, when 5564 * a View moves out of the screen, it might receives a display hint indicating 5565 * the view is not displayed. Applications should not <em>rely</em> on this hint 5566 * as there is no guarantee that they will receive one. 5567 * 5568 * @param hint A hint about whether or not this view is displayed: 5569 * {@link #VISIBLE} or {@link #INVISIBLE}. 5570 */ 5571 protected void onDisplayHint(int hint) { 5572 } 5573 5574 /** 5575 * Dispatch a window visibility change down the view hierarchy. 5576 * ViewGroups should override to route to their children. 5577 * 5578 * @param visibility The new visibility of the window. 5579 * 5580 * @see #onWindowVisibilityChanged(int) 5581 */ 5582 public void dispatchWindowVisibilityChanged(int visibility) { 5583 onWindowVisibilityChanged(visibility); 5584 } 5585 5586 /** 5587 * Called when the window containing has change its visibility 5588 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 5589 * that this tells you whether or not your window is being made visible 5590 * to the window manager; this does <em>not</em> tell you whether or not 5591 * your window is obscured by other windows on the screen, even if it 5592 * is itself visible. 5593 * 5594 * @param visibility The new visibility of the window. 5595 */ 5596 protected void onWindowVisibilityChanged(int visibility) { 5597 if (visibility == VISIBLE) { 5598 initialAwakenScrollBars(); 5599 } 5600 } 5601 5602 /** 5603 * Returns the current visibility of the window this view is attached to 5604 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 5605 * 5606 * @return Returns the current visibility of the view's window. 5607 */ 5608 public int getWindowVisibility() { 5609 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 5610 } 5611 5612 /** 5613 * Retrieve the overall visible display size in which the window this view is 5614 * attached to has been positioned in. This takes into account screen 5615 * decorations above the window, for both cases where the window itself 5616 * is being position inside of them or the window is being placed under 5617 * then and covered insets are used for the window to position its content 5618 * inside. In effect, this tells you the available area where content can 5619 * be placed and remain visible to users. 5620 * 5621 * <p>This function requires an IPC back to the window manager to retrieve 5622 * the requested information, so should not be used in performance critical 5623 * code like drawing. 5624 * 5625 * @param outRect Filled in with the visible display frame. If the view 5626 * is not attached to a window, this is simply the raw display size. 5627 */ 5628 public void getWindowVisibleDisplayFrame(Rect outRect) { 5629 if (mAttachInfo != null) { 5630 try { 5631 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 5632 } catch (RemoteException e) { 5633 return; 5634 } 5635 // XXX This is really broken, and probably all needs to be done 5636 // in the window manager, and we need to know more about whether 5637 // we want the area behind or in front of the IME. 5638 final Rect insets = mAttachInfo.mVisibleInsets; 5639 outRect.left += insets.left; 5640 outRect.top += insets.top; 5641 outRect.right -= insets.right; 5642 outRect.bottom -= insets.bottom; 5643 return; 5644 } 5645 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 5646 d.getRectSize(outRect); 5647 } 5648 5649 /** 5650 * Dispatch a notification about a resource configuration change down 5651 * the view hierarchy. 5652 * ViewGroups should override to route to their children. 5653 * 5654 * @param newConfig The new resource configuration. 5655 * 5656 * @see #onConfigurationChanged(android.content.res.Configuration) 5657 */ 5658 public void dispatchConfigurationChanged(Configuration newConfig) { 5659 onConfigurationChanged(newConfig); 5660 } 5661 5662 /** 5663 * Called when the current configuration of the resources being used 5664 * by the application have changed. You can use this to decide when 5665 * to reload resources that can changed based on orientation and other 5666 * configuration characterstics. You only need to use this if you are 5667 * not relying on the normal {@link android.app.Activity} mechanism of 5668 * recreating the activity instance upon a configuration change. 5669 * 5670 * @param newConfig The new resource configuration. 5671 */ 5672 protected void onConfigurationChanged(Configuration newConfig) { 5673 } 5674 5675 /** 5676 * Private function to aggregate all per-view attributes in to the view 5677 * root. 5678 */ 5679 void dispatchCollectViewAttributes(int visibility) { 5680 performCollectViewAttributes(visibility); 5681 } 5682 5683 void performCollectViewAttributes(int visibility) { 5684 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 5685 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 5686 mAttachInfo.mKeepScreenOn = true; 5687 } 5688 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 5689 if (mOnSystemUiVisibilityChangeListener != null) { 5690 mAttachInfo.mHasSystemUiListeners = true; 5691 } 5692 } 5693 } 5694 5695 void needGlobalAttributesUpdate(boolean force) { 5696 final AttachInfo ai = mAttachInfo; 5697 if (ai != null) { 5698 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 5699 || ai.mHasSystemUiListeners) { 5700 ai.mRecomputeGlobalAttributes = true; 5701 } 5702 } 5703 } 5704 5705 /** 5706 * Returns whether the device is currently in touch mode. Touch mode is entered 5707 * once the user begins interacting with the device by touch, and affects various 5708 * things like whether focus is always visible to the user. 5709 * 5710 * @return Whether the device is in touch mode. 5711 */ 5712 @ViewDebug.ExportedProperty 5713 public boolean isInTouchMode() { 5714 if (mAttachInfo != null) { 5715 return mAttachInfo.mInTouchMode; 5716 } else { 5717 return ViewRootImpl.isInTouchMode(); 5718 } 5719 } 5720 5721 /** 5722 * Returns the context the view is running in, through which it can 5723 * access the current theme, resources, etc. 5724 * 5725 * @return The view's Context. 5726 */ 5727 @ViewDebug.CapturedViewProperty 5728 public final Context getContext() { 5729 return mContext; 5730 } 5731 5732 /** 5733 * Handle a key event before it is processed by any input method 5734 * associated with the view hierarchy. This can be used to intercept 5735 * key events in special situations before the IME consumes them; a 5736 * typical example would be handling the BACK key to update the application's 5737 * UI instead of allowing the IME to see it and close itself. 5738 * 5739 * @param keyCode The value in event.getKeyCode(). 5740 * @param event Description of the key event. 5741 * @return If you handled the event, return true. If you want to allow the 5742 * event to be handled by the next receiver, return false. 5743 */ 5744 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 5745 return false; 5746 } 5747 5748 /** 5749 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 5750 * KeyEvent.Callback.onKeyDown()}: perform press of the view 5751 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 5752 * is released, if the view is enabled and clickable. 5753 * 5754 * @param keyCode A key code that represents the button pressed, from 5755 * {@link android.view.KeyEvent}. 5756 * @param event The KeyEvent object that defines the button action. 5757 */ 5758 public boolean onKeyDown(int keyCode, KeyEvent event) { 5759 boolean result = false; 5760 5761 switch (keyCode) { 5762 case KeyEvent.KEYCODE_DPAD_CENTER: 5763 case KeyEvent.KEYCODE_ENTER: { 5764 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5765 return true; 5766 } 5767 // Long clickable items don't necessarily have to be clickable 5768 if (((mViewFlags & CLICKABLE) == CLICKABLE || 5769 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 5770 (event.getRepeatCount() == 0)) { 5771 setPressed(true); 5772 checkForLongClick(0); 5773 return true; 5774 } 5775 break; 5776 } 5777 } 5778 return result; 5779 } 5780 5781 /** 5782 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 5783 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 5784 * the event). 5785 */ 5786 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 5787 return false; 5788 } 5789 5790 /** 5791 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 5792 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 5793 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 5794 * {@link KeyEvent#KEYCODE_ENTER} is released. 5795 * 5796 * @param keyCode A key code that represents the button pressed, from 5797 * {@link android.view.KeyEvent}. 5798 * @param event The KeyEvent object that defines the button action. 5799 */ 5800 public boolean onKeyUp(int keyCode, KeyEvent event) { 5801 boolean result = false; 5802 5803 switch (keyCode) { 5804 case KeyEvent.KEYCODE_DPAD_CENTER: 5805 case KeyEvent.KEYCODE_ENTER: { 5806 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 5807 return true; 5808 } 5809 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 5810 setPressed(false); 5811 5812 if (!mHasPerformedLongPress) { 5813 // This is a tap, so remove the longpress check 5814 removeLongPressCallback(); 5815 5816 result = performClick(); 5817 } 5818 } 5819 break; 5820 } 5821 } 5822 return result; 5823 } 5824 5825 /** 5826 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 5827 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 5828 * the event). 5829 * 5830 * @param keyCode A key code that represents the button pressed, from 5831 * {@link android.view.KeyEvent}. 5832 * @param repeatCount The number of times the action was made. 5833 * @param event The KeyEvent object that defines the button action. 5834 */ 5835 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 5836 return false; 5837 } 5838 5839 /** 5840 * Called on the focused view when a key shortcut event is not handled. 5841 * Override this method to implement local key shortcuts for the View. 5842 * Key shortcuts can also be implemented by setting the 5843 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 5844 * 5845 * @param keyCode The value in event.getKeyCode(). 5846 * @param event Description of the key event. 5847 * @return If you handled the event, return true. If you want to allow the 5848 * event to be handled by the next receiver, return false. 5849 */ 5850 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 5851 return false; 5852 } 5853 5854 /** 5855 * Check whether the called view is a text editor, in which case it 5856 * would make sense to automatically display a soft input window for 5857 * it. Subclasses should override this if they implement 5858 * {@link #onCreateInputConnection(EditorInfo)} to return true if 5859 * a call on that method would return a non-null InputConnection, and 5860 * they are really a first-class editor that the user would normally 5861 * start typing on when the go into a window containing your view. 5862 * 5863 * <p>The default implementation always returns false. This does 5864 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 5865 * will not be called or the user can not otherwise perform edits on your 5866 * view; it is just a hint to the system that this is not the primary 5867 * purpose of this view. 5868 * 5869 * @return Returns true if this view is a text editor, else false. 5870 */ 5871 public boolean onCheckIsTextEditor() { 5872 return false; 5873 } 5874 5875 /** 5876 * Create a new InputConnection for an InputMethod to interact 5877 * with the view. The default implementation returns null, since it doesn't 5878 * support input methods. You can override this to implement such support. 5879 * This is only needed for views that take focus and text input. 5880 * 5881 * <p>When implementing this, you probably also want to implement 5882 * {@link #onCheckIsTextEditor()} to indicate you will return a 5883 * non-null InputConnection. 5884 * 5885 * @param outAttrs Fill in with attribute information about the connection. 5886 */ 5887 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 5888 return null; 5889 } 5890 5891 /** 5892 * Called by the {@link android.view.inputmethod.InputMethodManager} 5893 * when a view who is not the current 5894 * input connection target is trying to make a call on the manager. The 5895 * default implementation returns false; you can override this to return 5896 * true for certain views if you are performing InputConnection proxying 5897 * to them. 5898 * @param view The View that is making the InputMethodManager call. 5899 * @return Return true to allow the call, false to reject. 5900 */ 5901 public boolean checkInputConnectionProxy(View view) { 5902 return false; 5903 } 5904 5905 /** 5906 * Show the context menu for this view. It is not safe to hold on to the 5907 * menu after returning from this method. 5908 * 5909 * You should normally not overload this method. Overload 5910 * {@link #onCreateContextMenu(ContextMenu)} or define an 5911 * {@link OnCreateContextMenuListener} to add items to the context menu. 5912 * 5913 * @param menu The context menu to populate 5914 */ 5915 public void createContextMenu(ContextMenu menu) { 5916 ContextMenuInfo menuInfo = getContextMenuInfo(); 5917 5918 // Sets the current menu info so all items added to menu will have 5919 // my extra info set. 5920 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 5921 5922 onCreateContextMenu(menu); 5923 if (mOnCreateContextMenuListener != null) { 5924 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 5925 } 5926 5927 // Clear the extra information so subsequent items that aren't mine don't 5928 // have my extra info. 5929 ((MenuBuilder)menu).setCurrentMenuInfo(null); 5930 5931 if (mParent != null) { 5932 mParent.createContextMenu(menu); 5933 } 5934 } 5935 5936 /** 5937 * Views should implement this if they have extra information to associate 5938 * with the context menu. The return result is supplied as a parameter to 5939 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 5940 * callback. 5941 * 5942 * @return Extra information about the item for which the context menu 5943 * should be shown. This information will vary across different 5944 * subclasses of View. 5945 */ 5946 protected ContextMenuInfo getContextMenuInfo() { 5947 return null; 5948 } 5949 5950 /** 5951 * Views should implement this if the view itself is going to add items to 5952 * the context menu. 5953 * 5954 * @param menu the context menu to populate 5955 */ 5956 protected void onCreateContextMenu(ContextMenu menu) { 5957 } 5958 5959 /** 5960 * Implement this method to handle trackball motion events. The 5961 * <em>relative</em> movement of the trackball since the last event 5962 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 5963 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 5964 * that a movement of 1 corresponds to the user pressing one DPAD key (so 5965 * they will often be fractional values, representing the more fine-grained 5966 * movement information available from a trackball). 5967 * 5968 * @param event The motion event. 5969 * @return True if the event was handled, false otherwise. 5970 */ 5971 public boolean onTrackballEvent(MotionEvent event) { 5972 return false; 5973 } 5974 5975 /** 5976 * Implement this method to handle generic motion events. 5977 * <p> 5978 * Generic motion events describe joystick movements, mouse hovers, track pad 5979 * touches, scroll wheel movements and other input events. The 5980 * {@link MotionEvent#getSource() source} of the motion event specifies 5981 * the class of input that was received. Implementations of this method 5982 * must examine the bits in the source before processing the event. 5983 * The following code example shows how this is done. 5984 * </p><p> 5985 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 5986 * are delivered to the view under the pointer. All other generic motion events are 5987 * delivered to the focused view. 5988 * </p> 5989 * <code> 5990 * public boolean onGenericMotionEvent(MotionEvent event) { 5991 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 5992 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 5993 * // process the joystick movement... 5994 * return true; 5995 * } 5996 * } 5997 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 5998 * switch (event.getAction()) { 5999 * case MotionEvent.ACTION_HOVER_MOVE: 6000 * // process the mouse hover movement... 6001 * return true; 6002 * case MotionEvent.ACTION_SCROLL: 6003 * // process the scroll wheel movement... 6004 * return true; 6005 * } 6006 * } 6007 * return super.onGenericMotionEvent(event); 6008 * } 6009 * </code> 6010 * 6011 * @param event The generic motion event being processed. 6012 * @return True if the event was handled, false otherwise. 6013 */ 6014 public boolean onGenericMotionEvent(MotionEvent event) { 6015 return false; 6016 } 6017 6018 /** 6019 * Implement this method to handle hover events. 6020 * <p> 6021 * This method is called whenever a pointer is hovering into, over, or out of the 6022 * bounds of a view and the view is not currently being touched. 6023 * Hover events are represented as pointer events with action 6024 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 6025 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 6026 * </p> 6027 * <ul> 6028 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 6029 * when the pointer enters the bounds of the view.</li> 6030 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 6031 * when the pointer has already entered the bounds of the view and has moved.</li> 6032 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 6033 * when the pointer has exited the bounds of the view or when the pointer is 6034 * about to go down due to a button click, tap, or similar user action that 6035 * causes the view to be touched.</li> 6036 * </ul> 6037 * <p> 6038 * The view should implement this method to return true to indicate that it is 6039 * handling the hover event, such as by changing its drawable state. 6040 * </p><p> 6041 * The default implementation calls {@link #setHovered} to update the hovered state 6042 * of the view when a hover enter or hover exit event is received, if the view 6043 * is enabled and is clickable. The default implementation also sends hover 6044 * accessibility events. 6045 * </p> 6046 * 6047 * @param event The motion event that describes the hover. 6048 * @return True if the view handled the hover event. 6049 * 6050 * @see #isHovered 6051 * @see #setHovered 6052 * @see #onHoverChanged 6053 */ 6054 public boolean onHoverEvent(MotionEvent event) { 6055 switch (event.getAction()) { 6056 case MotionEvent.ACTION_HOVER_ENTER: 6057 if (!hasHoveredChild() && !mSendingHoverAccessibilityEvents) { 6058 mSendingHoverAccessibilityEvents = true; 6059 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 6060 } 6061 break; 6062 case MotionEvent.ACTION_HOVER_EXIT: 6063 if (mSendingHoverAccessibilityEvents) { 6064 mSendingHoverAccessibilityEvents = false; 6065 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 6066 } 6067 break; 6068 } 6069 6070 if (isHoverable()) { 6071 switch (event.getAction()) { 6072 case MotionEvent.ACTION_HOVER_ENTER: 6073 setHovered(true); 6074 break; 6075 case MotionEvent.ACTION_HOVER_EXIT: 6076 setHovered(false); 6077 break; 6078 } 6079 6080 // Dispatch the event to onGenericMotionEvent before returning true. 6081 // This is to provide compatibility with existing applications that 6082 // handled HOVER_MOVE events in onGenericMotionEvent and that would 6083 // break because of the new default handling for hoverable views 6084 // in onHoverEvent. 6085 // Note that onGenericMotionEvent will be called by default when 6086 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 6087 dispatchGenericMotionEventInternal(event); 6088 return true; 6089 } 6090 return false; 6091 } 6092 6093 /** 6094 * Returns true if the view should handle {@link #onHoverEvent} 6095 * by calling {@link #setHovered} to change its hovered state. 6096 * 6097 * @return True if the view is hoverable. 6098 */ 6099 private boolean isHoverable() { 6100 final int viewFlags = mViewFlags; 6101 //noinspection SimplifiableIfStatement 6102 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6103 return false; 6104 } 6105 6106 return (viewFlags & CLICKABLE) == CLICKABLE 6107 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 6108 } 6109 6110 /** 6111 * Returns true if the view is currently hovered. 6112 * 6113 * @return True if the view is currently hovered. 6114 * 6115 * @see #setHovered 6116 * @see #onHoverChanged 6117 */ 6118 @ViewDebug.ExportedProperty 6119 public boolean isHovered() { 6120 return (mPrivateFlags & HOVERED) != 0; 6121 } 6122 6123 /** 6124 * Sets whether the view is currently hovered. 6125 * <p> 6126 * Calling this method also changes the drawable state of the view. This 6127 * enables the view to react to hover by using different drawable resources 6128 * to change its appearance. 6129 * </p><p> 6130 * The {@link #onHoverChanged} method is called when the hovered state changes. 6131 * </p> 6132 * 6133 * @param hovered True if the view is hovered. 6134 * 6135 * @see #isHovered 6136 * @see #onHoverChanged 6137 */ 6138 public void setHovered(boolean hovered) { 6139 if (hovered) { 6140 if ((mPrivateFlags & HOVERED) == 0) { 6141 mPrivateFlags |= HOVERED; 6142 refreshDrawableState(); 6143 onHoverChanged(true); 6144 } 6145 } else { 6146 if ((mPrivateFlags & HOVERED) != 0) { 6147 mPrivateFlags &= ~HOVERED; 6148 refreshDrawableState(); 6149 onHoverChanged(false); 6150 } 6151 } 6152 } 6153 6154 /** 6155 * Implement this method to handle hover state changes. 6156 * <p> 6157 * This method is called whenever the hover state changes as a result of a 6158 * call to {@link #setHovered}. 6159 * </p> 6160 * 6161 * @param hovered The current hover state, as returned by {@link #isHovered}. 6162 * 6163 * @see #isHovered 6164 * @see #setHovered 6165 */ 6166 public void onHoverChanged(boolean hovered) { 6167 } 6168 6169 /** 6170 * Implement this method to handle touch screen motion events. 6171 * 6172 * @param event The motion event. 6173 * @return True if the event was handled, false otherwise. 6174 */ 6175 public boolean onTouchEvent(MotionEvent event) { 6176 final int viewFlags = mViewFlags; 6177 6178 if ((viewFlags & ENABLED_MASK) == DISABLED) { 6179 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 6180 mPrivateFlags &= ~PRESSED; 6181 refreshDrawableState(); 6182 } 6183 // A disabled view that is clickable still consumes the touch 6184 // events, it just doesn't respond to them. 6185 return (((viewFlags & CLICKABLE) == CLICKABLE || 6186 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 6187 } 6188 6189 if (mTouchDelegate != null) { 6190 if (mTouchDelegate.onTouchEvent(event)) { 6191 return true; 6192 } 6193 } 6194 6195 if (((viewFlags & CLICKABLE) == CLICKABLE || 6196 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 6197 switch (event.getAction()) { 6198 case MotionEvent.ACTION_UP: 6199 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 6200 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 6201 // take focus if we don't have it already and we should in 6202 // touch mode. 6203 boolean focusTaken = false; 6204 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 6205 focusTaken = requestFocus(); 6206 } 6207 6208 if (prepressed) { 6209 // The button is being released before we actually 6210 // showed it as pressed. Make it show the pressed 6211 // state now (before scheduling the click) to ensure 6212 // the user sees it. 6213 mPrivateFlags |= PRESSED; 6214 refreshDrawableState(); 6215 } 6216 6217 if (!mHasPerformedLongPress) { 6218 // This is a tap, so remove the longpress check 6219 removeLongPressCallback(); 6220 6221 // Only perform take click actions if we were in the pressed state 6222 if (!focusTaken) { 6223 // Use a Runnable and post this rather than calling 6224 // performClick directly. This lets other visual state 6225 // of the view update before click actions start. 6226 if (mPerformClick == null) { 6227 mPerformClick = new PerformClick(); 6228 } 6229 if (!post(mPerformClick)) { 6230 performClick(); 6231 } 6232 } 6233 } 6234 6235 if (mUnsetPressedState == null) { 6236 mUnsetPressedState = new UnsetPressedState(); 6237 } 6238 6239 if (prepressed) { 6240 postDelayed(mUnsetPressedState, 6241 ViewConfiguration.getPressedStateDuration()); 6242 } else if (!post(mUnsetPressedState)) { 6243 // If the post failed, unpress right now 6244 mUnsetPressedState.run(); 6245 } 6246 removeTapCallback(); 6247 } 6248 break; 6249 6250 case MotionEvent.ACTION_DOWN: 6251 mHasPerformedLongPress = false; 6252 6253 if (performButtonActionOnTouchDown(event)) { 6254 break; 6255 } 6256 6257 // Walk up the hierarchy to determine if we're inside a scrolling container. 6258 boolean isInScrollingContainer = isInScrollingContainer(); 6259 6260 // For views inside a scrolling container, delay the pressed feedback for 6261 // a short period in case this is a scroll. 6262 if (isInScrollingContainer) { 6263 mPrivateFlags |= PREPRESSED; 6264 if (mPendingCheckForTap == null) { 6265 mPendingCheckForTap = new CheckForTap(); 6266 } 6267 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 6268 } else { 6269 // Not inside a scrolling container, so show the feedback right away 6270 mPrivateFlags |= PRESSED; 6271 refreshDrawableState(); 6272 checkForLongClick(0); 6273 } 6274 break; 6275 6276 case MotionEvent.ACTION_CANCEL: 6277 mPrivateFlags &= ~PRESSED; 6278 refreshDrawableState(); 6279 removeTapCallback(); 6280 break; 6281 6282 case MotionEvent.ACTION_MOVE: 6283 final int x = (int) event.getX(); 6284 final int y = (int) event.getY(); 6285 6286 // Be lenient about moving outside of buttons 6287 if (!pointInView(x, y, mTouchSlop)) { 6288 // Outside button 6289 removeTapCallback(); 6290 if ((mPrivateFlags & PRESSED) != 0) { 6291 // Remove any future long press/tap checks 6292 removeLongPressCallback(); 6293 6294 // Need to switch from pressed to not pressed 6295 mPrivateFlags &= ~PRESSED; 6296 refreshDrawableState(); 6297 } 6298 } 6299 break; 6300 } 6301 return true; 6302 } 6303 6304 return false; 6305 } 6306 6307 /** 6308 * @hide 6309 */ 6310 public boolean isInScrollingContainer() { 6311 ViewParent p = getParent(); 6312 while (p != null && p instanceof ViewGroup) { 6313 if (((ViewGroup) p).shouldDelayChildPressedState()) { 6314 return true; 6315 } 6316 p = p.getParent(); 6317 } 6318 return false; 6319 } 6320 6321 /** 6322 * Remove the longpress detection timer. 6323 */ 6324 private void removeLongPressCallback() { 6325 if (mPendingCheckForLongPress != null) { 6326 removeCallbacks(mPendingCheckForLongPress); 6327 } 6328 } 6329 6330 /** 6331 * Remove the pending click action 6332 */ 6333 private void removePerformClickCallback() { 6334 if (mPerformClick != null) { 6335 removeCallbacks(mPerformClick); 6336 } 6337 } 6338 6339 /** 6340 * Remove the prepress detection timer. 6341 */ 6342 private void removeUnsetPressCallback() { 6343 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 6344 setPressed(false); 6345 removeCallbacks(mUnsetPressedState); 6346 } 6347 } 6348 6349 /** 6350 * Remove the tap detection timer. 6351 */ 6352 private void removeTapCallback() { 6353 if (mPendingCheckForTap != null) { 6354 mPrivateFlags &= ~PREPRESSED; 6355 removeCallbacks(mPendingCheckForTap); 6356 } 6357 } 6358 6359 /** 6360 * Cancels a pending long press. Your subclass can use this if you 6361 * want the context menu to come up if the user presses and holds 6362 * at the same place, but you don't want it to come up if they press 6363 * and then move around enough to cause scrolling. 6364 */ 6365 public void cancelLongPress() { 6366 removeLongPressCallback(); 6367 6368 /* 6369 * The prepressed state handled by the tap callback is a display 6370 * construct, but the tap callback will post a long press callback 6371 * less its own timeout. Remove it here. 6372 */ 6373 removeTapCallback(); 6374 } 6375 6376 /** 6377 * Remove the pending callback for sending a 6378 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 6379 */ 6380 private void removeSendViewScrolledAccessibilityEventCallback() { 6381 if (mSendViewScrolledAccessibilityEvent != null) { 6382 removeCallbacks(mSendViewScrolledAccessibilityEvent); 6383 } 6384 } 6385 6386 /** 6387 * Sets the TouchDelegate for this View. 6388 */ 6389 public void setTouchDelegate(TouchDelegate delegate) { 6390 mTouchDelegate = delegate; 6391 } 6392 6393 /** 6394 * Gets the TouchDelegate for this View. 6395 */ 6396 public TouchDelegate getTouchDelegate() { 6397 return mTouchDelegate; 6398 } 6399 6400 /** 6401 * Set flags controlling behavior of this view. 6402 * 6403 * @param flags Constant indicating the value which should be set 6404 * @param mask Constant indicating the bit range that should be changed 6405 */ 6406 void setFlags(int flags, int mask) { 6407 int old = mViewFlags; 6408 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 6409 6410 int changed = mViewFlags ^ old; 6411 if (changed == 0) { 6412 return; 6413 } 6414 int privateFlags = mPrivateFlags; 6415 6416 /* Check if the FOCUSABLE bit has changed */ 6417 if (((changed & FOCUSABLE_MASK) != 0) && 6418 ((privateFlags & HAS_BOUNDS) !=0)) { 6419 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 6420 && ((privateFlags & FOCUSED) != 0)) { 6421 /* Give up focus if we are no longer focusable */ 6422 clearFocus(); 6423 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 6424 && ((privateFlags & FOCUSED) == 0)) { 6425 /* 6426 * Tell the view system that we are now available to take focus 6427 * if no one else already has it. 6428 */ 6429 if (mParent != null) mParent.focusableViewAvailable(this); 6430 } 6431 } 6432 6433 if ((flags & VISIBILITY_MASK) == VISIBLE) { 6434 if ((changed & VISIBILITY_MASK) != 0) { 6435 /* 6436 * If this view is becoming visible, invalidate it in case it changed while 6437 * it was not visible. 6438 */ 6439 invalidate(true); 6440 6441 needGlobalAttributesUpdate(true); 6442 6443 // a view becoming visible is worth notifying the parent 6444 // about in case nothing has focus. even if this specific view 6445 // isn't focusable, it may contain something that is, so let 6446 // the root view try to give this focus if nothing else does. 6447 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 6448 mParent.focusableViewAvailable(this); 6449 } 6450 } 6451 } 6452 6453 /* Check if the GONE bit has changed */ 6454 if ((changed & GONE) != 0) { 6455 needGlobalAttributesUpdate(false); 6456 requestLayout(); 6457 invalidate(true); 6458 6459 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 6460 if (hasFocus()) clearFocus(); 6461 destroyDrawingCache(); 6462 } 6463 if (mAttachInfo != null) { 6464 mAttachInfo.mViewVisibilityChanged = true; 6465 } 6466 } 6467 6468 /* Check if the VISIBLE bit has changed */ 6469 if ((changed & INVISIBLE) != 0) { 6470 needGlobalAttributesUpdate(false); 6471 /* 6472 * If this view is becoming invisible, set the DRAWN flag so that 6473 * the next invalidate() will not be skipped. 6474 */ 6475 mPrivateFlags |= DRAWN; 6476 6477 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 6478 // root view becoming invisible shouldn't clear focus 6479 if (getRootView() != this) { 6480 clearFocus(); 6481 } 6482 } 6483 if (mAttachInfo != null) { 6484 mAttachInfo.mViewVisibilityChanged = true; 6485 } 6486 } 6487 6488 if ((changed & VISIBILITY_MASK) != 0) { 6489 if (mParent instanceof ViewGroup) { 6490 ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6491 ((View) mParent).invalidate(true); 6492 } 6493 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 6494 } 6495 6496 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 6497 destroyDrawingCache(); 6498 } 6499 6500 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 6501 destroyDrawingCache(); 6502 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6503 invalidateParentCaches(); 6504 } 6505 6506 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 6507 destroyDrawingCache(); 6508 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6509 } 6510 6511 if ((changed & DRAW_MASK) != 0) { 6512 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 6513 if (mBGDrawable != null) { 6514 mPrivateFlags &= ~SKIP_DRAW; 6515 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 6516 } else { 6517 mPrivateFlags |= SKIP_DRAW; 6518 } 6519 } else { 6520 mPrivateFlags &= ~SKIP_DRAW; 6521 } 6522 requestLayout(); 6523 invalidate(true); 6524 } 6525 6526 if ((changed & KEEP_SCREEN_ON) != 0) { 6527 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 6528 mParent.recomputeViewAttributes(this); 6529 } 6530 } 6531 6532 if ((changed & LAYOUT_DIRECTION_MASK) != 0) { 6533 requestLayout(); 6534 } 6535 } 6536 6537 /** 6538 * Change the view's z order in the tree, so it's on top of other sibling 6539 * views 6540 */ 6541 public void bringToFront() { 6542 if (mParent != null) { 6543 mParent.bringChildToFront(this); 6544 } 6545 } 6546 6547 /** 6548 * This is called in response to an internal scroll in this view (i.e., the 6549 * view scrolled its own contents). This is typically as a result of 6550 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 6551 * called. 6552 * 6553 * @param l Current horizontal scroll origin. 6554 * @param t Current vertical scroll origin. 6555 * @param oldl Previous horizontal scroll origin. 6556 * @param oldt Previous vertical scroll origin. 6557 */ 6558 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 6559 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 6560 postSendViewScrolledAccessibilityEventCallback(); 6561 } 6562 6563 mBackgroundSizeChanged = true; 6564 6565 final AttachInfo ai = mAttachInfo; 6566 if (ai != null) { 6567 ai.mViewScrollChanged = true; 6568 } 6569 } 6570 6571 /** 6572 * Interface definition for a callback to be invoked when the layout bounds of a view 6573 * changes due to layout processing. 6574 */ 6575 public interface OnLayoutChangeListener { 6576 /** 6577 * Called when the focus state of a view has changed. 6578 * 6579 * @param v The view whose state has changed. 6580 * @param left The new value of the view's left property. 6581 * @param top The new value of the view's top property. 6582 * @param right The new value of the view's right property. 6583 * @param bottom The new value of the view's bottom property. 6584 * @param oldLeft The previous value of the view's left property. 6585 * @param oldTop The previous value of the view's top property. 6586 * @param oldRight The previous value of the view's right property. 6587 * @param oldBottom The previous value of the view's bottom property. 6588 */ 6589 void onLayoutChange(View v, int left, int top, int right, int bottom, 6590 int oldLeft, int oldTop, int oldRight, int oldBottom); 6591 } 6592 6593 /** 6594 * This is called during layout when the size of this view has changed. If 6595 * you were just added to the view hierarchy, you're called with the old 6596 * values of 0. 6597 * 6598 * @param w Current width of this view. 6599 * @param h Current height of this view. 6600 * @param oldw Old width of this view. 6601 * @param oldh Old height of this view. 6602 */ 6603 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 6604 } 6605 6606 /** 6607 * Called by draw to draw the child views. This may be overridden 6608 * by derived classes to gain control just before its children are drawn 6609 * (but after its own view has been drawn). 6610 * @param canvas the canvas on which to draw the view 6611 */ 6612 protected void dispatchDraw(Canvas canvas) { 6613 } 6614 6615 /** 6616 * Gets the parent of this view. Note that the parent is a 6617 * ViewParent and not necessarily a View. 6618 * 6619 * @return Parent of this view. 6620 */ 6621 public final ViewParent getParent() { 6622 return mParent; 6623 } 6624 6625 /** 6626 * Set the horizontal scrolled position of your view. This will cause a call to 6627 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6628 * invalidated. 6629 * @param value the x position to scroll to 6630 */ 6631 public void setScrollX(int value) { 6632 scrollTo(value, mScrollY); 6633 } 6634 6635 /** 6636 * Set the vertical scrolled position of your view. This will cause a call to 6637 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6638 * invalidated. 6639 * @param value the y position to scroll to 6640 */ 6641 public void setScrollY(int value) { 6642 scrollTo(mScrollX, value); 6643 } 6644 6645 /** 6646 * Return the scrolled left position of this view. This is the left edge of 6647 * the displayed part of your view. You do not need to draw any pixels 6648 * farther left, since those are outside of the frame of your view on 6649 * screen. 6650 * 6651 * @return The left edge of the displayed part of your view, in pixels. 6652 */ 6653 public final int getScrollX() { 6654 return mScrollX; 6655 } 6656 6657 /** 6658 * Return the scrolled top position of this view. This is the top edge of 6659 * the displayed part of your view. You do not need to draw any pixels above 6660 * it, since those are outside of the frame of your view on screen. 6661 * 6662 * @return The top edge of the displayed part of your view, in pixels. 6663 */ 6664 public final int getScrollY() { 6665 return mScrollY; 6666 } 6667 6668 /** 6669 * Return the width of the your view. 6670 * 6671 * @return The width of your view, in pixels. 6672 */ 6673 @ViewDebug.ExportedProperty(category = "layout") 6674 public final int getWidth() { 6675 return mRight - mLeft; 6676 } 6677 6678 /** 6679 * Return the height of your view. 6680 * 6681 * @return The height of your view, in pixels. 6682 */ 6683 @ViewDebug.ExportedProperty(category = "layout") 6684 public final int getHeight() { 6685 return mBottom - mTop; 6686 } 6687 6688 /** 6689 * Return the visible drawing bounds of your view. Fills in the output 6690 * rectangle with the values from getScrollX(), getScrollY(), 6691 * getWidth(), and getHeight(). 6692 * 6693 * @param outRect The (scrolled) drawing bounds of the view. 6694 */ 6695 public void getDrawingRect(Rect outRect) { 6696 outRect.left = mScrollX; 6697 outRect.top = mScrollY; 6698 outRect.right = mScrollX + (mRight - mLeft); 6699 outRect.bottom = mScrollY + (mBottom - mTop); 6700 } 6701 6702 /** 6703 * Like {@link #getMeasuredWidthAndState()}, but only returns the 6704 * raw width component (that is the result is masked by 6705 * {@link #MEASURED_SIZE_MASK}). 6706 * 6707 * @return The raw measured width of this view. 6708 */ 6709 public final int getMeasuredWidth() { 6710 return mMeasuredWidth & MEASURED_SIZE_MASK; 6711 } 6712 6713 /** 6714 * Return the full width measurement information for this view as computed 6715 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6716 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6717 * This should be used during measurement and layout calculations only. Use 6718 * {@link #getWidth()} to see how wide a view is after layout. 6719 * 6720 * @return The measured width of this view as a bit mask. 6721 */ 6722 public final int getMeasuredWidthAndState() { 6723 return mMeasuredWidth; 6724 } 6725 6726 /** 6727 * Like {@link #getMeasuredHeightAndState()}, but only returns the 6728 * raw width component (that is the result is masked by 6729 * {@link #MEASURED_SIZE_MASK}). 6730 * 6731 * @return The raw measured height of this view. 6732 */ 6733 public final int getMeasuredHeight() { 6734 return mMeasuredHeight & MEASURED_SIZE_MASK; 6735 } 6736 6737 /** 6738 * Return the full height measurement information for this view as computed 6739 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 6740 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 6741 * This should be used during measurement and layout calculations only. Use 6742 * {@link #getHeight()} to see how wide a view is after layout. 6743 * 6744 * @return The measured width of this view as a bit mask. 6745 */ 6746 public final int getMeasuredHeightAndState() { 6747 return mMeasuredHeight; 6748 } 6749 6750 /** 6751 * Return only the state bits of {@link #getMeasuredWidthAndState()} 6752 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 6753 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 6754 * and the height component is at the shifted bits 6755 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 6756 */ 6757 public final int getMeasuredState() { 6758 return (mMeasuredWidth&MEASURED_STATE_MASK) 6759 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 6760 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 6761 } 6762 6763 /** 6764 * The transform matrix of this view, which is calculated based on the current 6765 * roation, scale, and pivot properties. 6766 * 6767 * @see #getRotation() 6768 * @see #getScaleX() 6769 * @see #getScaleY() 6770 * @see #getPivotX() 6771 * @see #getPivotY() 6772 * @return The current transform matrix for the view 6773 */ 6774 public Matrix getMatrix() { 6775 updateMatrix(); 6776 return mMatrix; 6777 } 6778 6779 /** 6780 * Utility function to determine if the value is far enough away from zero to be 6781 * considered non-zero. 6782 * @param value A floating point value to check for zero-ness 6783 * @return whether the passed-in value is far enough away from zero to be considered non-zero 6784 */ 6785 private static boolean nonzero(float value) { 6786 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 6787 } 6788 6789 /** 6790 * Returns true if the transform matrix is the identity matrix. 6791 * Recomputes the matrix if necessary. 6792 * 6793 * @return True if the transform matrix is the identity matrix, false otherwise. 6794 */ 6795 final boolean hasIdentityMatrix() { 6796 updateMatrix(); 6797 return mMatrixIsIdentity; 6798 } 6799 6800 /** 6801 * Recomputes the transform matrix if necessary. 6802 */ 6803 private void updateMatrix() { 6804 if (mMatrixDirty) { 6805 // transform-related properties have changed since the last time someone 6806 // asked for the matrix; recalculate it with the current values 6807 6808 // Figure out if we need to update the pivot point 6809 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6810 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 6811 mPrevWidth = mRight - mLeft; 6812 mPrevHeight = mBottom - mTop; 6813 mPivotX = mPrevWidth / 2f; 6814 mPivotY = mPrevHeight / 2f; 6815 } 6816 } 6817 mMatrix.reset(); 6818 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 6819 mMatrix.setTranslate(mTranslationX, mTranslationY); 6820 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 6821 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6822 } else { 6823 if (mCamera == null) { 6824 mCamera = new Camera(); 6825 matrix3D = new Matrix(); 6826 } 6827 mCamera.save(); 6828 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 6829 mCamera.rotate(mRotationX, mRotationY, -mRotation); 6830 mCamera.getMatrix(matrix3D); 6831 matrix3D.preTranslate(-mPivotX, -mPivotY); 6832 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 6833 mMatrix.postConcat(matrix3D); 6834 mCamera.restore(); 6835 } 6836 mMatrixDirty = false; 6837 mMatrixIsIdentity = mMatrix.isIdentity(); 6838 mInverseMatrixDirty = true; 6839 } 6840 } 6841 6842 /** 6843 * Utility method to retrieve the inverse of the current mMatrix property. 6844 * We cache the matrix to avoid recalculating it when transform properties 6845 * have not changed. 6846 * 6847 * @return The inverse of the current matrix of this view. 6848 */ 6849 final Matrix getInverseMatrix() { 6850 updateMatrix(); 6851 if (mInverseMatrixDirty) { 6852 if (mInverseMatrix == null) { 6853 mInverseMatrix = new Matrix(); 6854 } 6855 mMatrix.invert(mInverseMatrix); 6856 mInverseMatrixDirty = false; 6857 } 6858 return mInverseMatrix; 6859 } 6860 6861 /** 6862 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 6863 * views are drawn) from the camera to this view. The camera's distance 6864 * affects 3D transformations, for instance rotations around the X and Y 6865 * axis. If the rotationX or rotationY properties are changed and this view is 6866 * large (more than half the size of the screen), it is recommended to always 6867 * use a camera distance that's greater than the height (X axis rotation) or 6868 * the width (Y axis rotation) of this view.</p> 6869 * 6870 * <p>The distance of the camera from the view plane can have an affect on the 6871 * perspective distortion of the view when it is rotated around the x or y axis. 6872 * For example, a large distance will result in a large viewing angle, and there 6873 * will not be much perspective distortion of the view as it rotates. A short 6874 * distance may cause much more perspective distortion upon rotation, and can 6875 * also result in some drawing artifacts if the rotated view ends up partially 6876 * behind the camera (which is why the recommendation is to use a distance at 6877 * least as far as the size of the view, if the view is to be rotated.)</p> 6878 * 6879 * <p>The distance is expressed in "depth pixels." The default distance depends 6880 * on the screen density. For instance, on a medium density display, the 6881 * default distance is 1280. On a high density display, the default distance 6882 * is 1920.</p> 6883 * 6884 * <p>If you want to specify a distance that leads to visually consistent 6885 * results across various densities, use the following formula:</p> 6886 * <pre> 6887 * float scale = context.getResources().getDisplayMetrics().density; 6888 * view.setCameraDistance(distance * scale); 6889 * </pre> 6890 * 6891 * <p>The density scale factor of a high density display is 1.5, 6892 * and 1920 = 1280 * 1.5.</p> 6893 * 6894 * @param distance The distance in "depth pixels", if negative the opposite 6895 * value is used 6896 * 6897 * @see #setRotationX(float) 6898 * @see #setRotationY(float) 6899 */ 6900 public void setCameraDistance(float distance) { 6901 invalidateParentCaches(); 6902 invalidate(false); 6903 6904 final float dpi = mResources.getDisplayMetrics().densityDpi; 6905 if (mCamera == null) { 6906 mCamera = new Camera(); 6907 matrix3D = new Matrix(); 6908 } 6909 6910 mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 6911 mMatrixDirty = true; 6912 6913 invalidate(false); 6914 } 6915 6916 /** 6917 * The degrees that the view is rotated around the pivot point. 6918 * 6919 * @see #setRotation(float) 6920 * @see #getPivotX() 6921 * @see #getPivotY() 6922 * 6923 * @return The degrees of rotation. 6924 */ 6925 public float getRotation() { 6926 return mRotation; 6927 } 6928 6929 /** 6930 * Sets the degrees that the view is rotated around the pivot point. Increasing values 6931 * result in clockwise rotation. 6932 * 6933 * @param rotation The degrees of rotation. 6934 * 6935 * @see #getRotation() 6936 * @see #getPivotX() 6937 * @see #getPivotY() 6938 * @see #setRotationX(float) 6939 * @see #setRotationY(float) 6940 * 6941 * @attr ref android.R.styleable#View_rotation 6942 */ 6943 public void setRotation(float rotation) { 6944 if (mRotation != rotation) { 6945 invalidateParentCaches(); 6946 // Double-invalidation is necessary to capture view's old and new areas 6947 invalidate(false); 6948 mRotation = rotation; 6949 mMatrixDirty = true; 6950 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6951 invalidate(false); 6952 } 6953 } 6954 6955 /** 6956 * The degrees that the view is rotated around the vertical axis through the pivot point. 6957 * 6958 * @see #getPivotX() 6959 * @see #getPivotY() 6960 * @see #setRotationY(float) 6961 * 6962 * @return The degrees of Y rotation. 6963 */ 6964 public float getRotationY() { 6965 return mRotationY; 6966 } 6967 6968 /** 6969 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 6970 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 6971 * down the y axis. 6972 * 6973 * When rotating large views, it is recommended to adjust the camera distance 6974 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 6975 * 6976 * @param rotationY The degrees of Y rotation. 6977 * 6978 * @see #getRotationY() 6979 * @see #getPivotX() 6980 * @see #getPivotY() 6981 * @see #setRotation(float) 6982 * @see #setRotationX(float) 6983 * @see #setCameraDistance(float) 6984 * 6985 * @attr ref android.R.styleable#View_rotationY 6986 */ 6987 public void setRotationY(float rotationY) { 6988 if (mRotationY != rotationY) { 6989 invalidateParentCaches(); 6990 // Double-invalidation is necessary to capture view's old and new areas 6991 invalidate(false); 6992 mRotationY = rotationY; 6993 mMatrixDirty = true; 6994 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6995 invalidate(false); 6996 } 6997 } 6998 6999 /** 7000 * The degrees that the view is rotated around the horizontal axis through the pivot point. 7001 * 7002 * @see #getPivotX() 7003 * @see #getPivotY() 7004 * @see #setRotationX(float) 7005 * 7006 * @return The degrees of X rotation. 7007 */ 7008 public float getRotationX() { 7009 return mRotationX; 7010 } 7011 7012 /** 7013 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 7014 * Increasing values result in clockwise rotation from the viewpoint of looking down the 7015 * x axis. 7016 * 7017 * When rotating large views, it is recommended to adjust the camera distance 7018 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 7019 * 7020 * @param rotationX The degrees of X rotation. 7021 * 7022 * @see #getRotationX() 7023 * @see #getPivotX() 7024 * @see #getPivotY() 7025 * @see #setRotation(float) 7026 * @see #setRotationY(float) 7027 * @see #setCameraDistance(float) 7028 * 7029 * @attr ref android.R.styleable#View_rotationX 7030 */ 7031 public void setRotationX(float rotationX) { 7032 if (mRotationX != rotationX) { 7033 invalidateParentCaches(); 7034 // Double-invalidation is necessary to capture view's old and new areas 7035 invalidate(false); 7036 mRotationX = rotationX; 7037 mMatrixDirty = true; 7038 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7039 invalidate(false); 7040 } 7041 } 7042 7043 /** 7044 * The amount that the view is scaled in x around the pivot point, as a proportion of 7045 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 7046 * 7047 * <p>By default, this is 1.0f. 7048 * 7049 * @see #getPivotX() 7050 * @see #getPivotY() 7051 * @return The scaling factor. 7052 */ 7053 public float getScaleX() { 7054 return mScaleX; 7055 } 7056 7057 /** 7058 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 7059 * the view's unscaled width. A value of 1 means that no scaling is applied. 7060 * 7061 * @param scaleX The scaling factor. 7062 * @see #getPivotX() 7063 * @see #getPivotY() 7064 * 7065 * @attr ref android.R.styleable#View_scaleX 7066 */ 7067 public void setScaleX(float scaleX) { 7068 if (mScaleX != scaleX) { 7069 invalidateParentCaches(); 7070 // Double-invalidation is necessary to capture view's old and new areas 7071 invalidate(false); 7072 mScaleX = scaleX; 7073 mMatrixDirty = true; 7074 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7075 invalidate(false); 7076 } 7077 } 7078 7079 /** 7080 * The amount that the view is scaled in y around the pivot point, as a proportion of 7081 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 7082 * 7083 * <p>By default, this is 1.0f. 7084 * 7085 * @see #getPivotX() 7086 * @see #getPivotY() 7087 * @return The scaling factor. 7088 */ 7089 public float getScaleY() { 7090 return mScaleY; 7091 } 7092 7093 /** 7094 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 7095 * the view's unscaled width. A value of 1 means that no scaling is applied. 7096 * 7097 * @param scaleY The scaling factor. 7098 * @see #getPivotX() 7099 * @see #getPivotY() 7100 * 7101 * @attr ref android.R.styleable#View_scaleY 7102 */ 7103 public void setScaleY(float scaleY) { 7104 if (mScaleY != scaleY) { 7105 invalidateParentCaches(); 7106 // Double-invalidation is necessary to capture view's old and new areas 7107 invalidate(false); 7108 mScaleY = scaleY; 7109 mMatrixDirty = true; 7110 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7111 invalidate(false); 7112 } 7113 } 7114 7115 /** 7116 * The x location of the point around which the view is {@link #setRotation(float) rotated} 7117 * and {@link #setScaleX(float) scaled}. 7118 * 7119 * @see #getRotation() 7120 * @see #getScaleX() 7121 * @see #getScaleY() 7122 * @see #getPivotY() 7123 * @return The x location of the pivot point. 7124 */ 7125 public float getPivotX() { 7126 return mPivotX; 7127 } 7128 7129 /** 7130 * Sets the x location of the point around which the view is 7131 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 7132 * By default, the pivot point is centered on the object. 7133 * Setting this property disables this behavior and causes the view to use only the 7134 * explicitly set pivotX and pivotY values. 7135 * 7136 * @param pivotX The x location of the pivot point. 7137 * @see #getRotation() 7138 * @see #getScaleX() 7139 * @see #getScaleY() 7140 * @see #getPivotY() 7141 * 7142 * @attr ref android.R.styleable#View_transformPivotX 7143 */ 7144 public void setPivotX(float pivotX) { 7145 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7146 if (mPivotX != pivotX) { 7147 invalidateParentCaches(); 7148 // Double-invalidation is necessary to capture view's old and new areas 7149 invalidate(false); 7150 mPivotX = pivotX; 7151 mMatrixDirty = true; 7152 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7153 invalidate(false); 7154 } 7155 } 7156 7157 /** 7158 * The y location of the point around which the view is {@link #setRotation(float) rotated} 7159 * and {@link #setScaleY(float) scaled}. 7160 * 7161 * @see #getRotation() 7162 * @see #getScaleX() 7163 * @see #getScaleY() 7164 * @see #getPivotY() 7165 * @return The y location of the pivot point. 7166 */ 7167 public float getPivotY() { 7168 return mPivotY; 7169 } 7170 7171 /** 7172 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 7173 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 7174 * Setting this property disables this behavior and causes the view to use only the 7175 * explicitly set pivotX and pivotY values. 7176 * 7177 * @param pivotY The y location of the pivot point. 7178 * @see #getRotation() 7179 * @see #getScaleX() 7180 * @see #getScaleY() 7181 * @see #getPivotY() 7182 * 7183 * @attr ref android.R.styleable#View_transformPivotY 7184 */ 7185 public void setPivotY(float pivotY) { 7186 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 7187 if (mPivotY != pivotY) { 7188 invalidateParentCaches(); 7189 // Double-invalidation is necessary to capture view's old and new areas 7190 invalidate(false); 7191 mPivotY = pivotY; 7192 mMatrixDirty = true; 7193 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7194 invalidate(false); 7195 } 7196 } 7197 7198 /** 7199 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 7200 * completely transparent and 1 means the view is completely opaque. 7201 * 7202 * <p>By default this is 1.0f. 7203 * @return The opacity of the view. 7204 */ 7205 public float getAlpha() { 7206 return mAlpha; 7207 } 7208 7209 /** 7210 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 7211 * completely transparent and 1 means the view is completely opaque.</p> 7212 * 7213 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 7214 * responsible for applying the opacity itself. Otherwise, calling this method is 7215 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 7216 * setting a hardware layer.</p> 7217 * 7218 * @param alpha The opacity of the view. 7219 * 7220 * @see #setLayerType(int, android.graphics.Paint) 7221 * 7222 * @attr ref android.R.styleable#View_alpha 7223 */ 7224 public void setAlpha(float alpha) { 7225 mAlpha = alpha; 7226 invalidateParentCaches(); 7227 if (onSetAlpha((int) (alpha * 255))) { 7228 mPrivateFlags |= ALPHA_SET; 7229 // subclass is handling alpha - don't optimize rendering cache invalidation 7230 invalidate(true); 7231 } else { 7232 mPrivateFlags &= ~ALPHA_SET; 7233 invalidate(false); 7234 } 7235 } 7236 7237 /** 7238 * Faster version of setAlpha() which performs the same steps except there are 7239 * no calls to invalidate(). The caller of this function should perform proper invalidation 7240 * on the parent and this object. The return value indicates whether the subclass handles 7241 * alpha (the return value for onSetAlpha()). 7242 * 7243 * @param alpha The new value for the alpha property 7244 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) 7245 */ 7246 boolean setAlphaNoInvalidation(float alpha) { 7247 mAlpha = alpha; 7248 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 7249 if (subclassHandlesAlpha) { 7250 mPrivateFlags |= ALPHA_SET; 7251 } else { 7252 mPrivateFlags &= ~ALPHA_SET; 7253 } 7254 return subclassHandlesAlpha; 7255 } 7256 7257 /** 7258 * Top position of this view relative to its parent. 7259 * 7260 * @return The top of this view, in pixels. 7261 */ 7262 @ViewDebug.CapturedViewProperty 7263 public final int getTop() { 7264 return mTop; 7265 } 7266 7267 /** 7268 * Sets the top position of this view relative to its parent. This method is meant to be called 7269 * by the layout system and should not generally be called otherwise, because the property 7270 * may be changed at any time by the layout. 7271 * 7272 * @param top The top of this view, in pixels. 7273 */ 7274 public final void setTop(int top) { 7275 if (top != mTop) { 7276 updateMatrix(); 7277 if (mMatrixIsIdentity) { 7278 if (mAttachInfo != null) { 7279 int minTop; 7280 int yLoc; 7281 if (top < mTop) { 7282 minTop = top; 7283 yLoc = top - mTop; 7284 } else { 7285 minTop = mTop; 7286 yLoc = 0; 7287 } 7288 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 7289 } 7290 } else { 7291 // Double-invalidation is necessary to capture view's old and new areas 7292 invalidate(true); 7293 } 7294 7295 int width = mRight - mLeft; 7296 int oldHeight = mBottom - mTop; 7297 7298 mTop = top; 7299 7300 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7301 7302 if (!mMatrixIsIdentity) { 7303 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7304 // A change in dimension means an auto-centered pivot point changes, too 7305 mMatrixDirty = true; 7306 } 7307 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7308 invalidate(true); 7309 } 7310 mBackgroundSizeChanged = true; 7311 invalidateParentIfNeeded(); 7312 } 7313 } 7314 7315 /** 7316 * Bottom position of this view relative to its parent. 7317 * 7318 * @return The bottom of this view, in pixels. 7319 */ 7320 @ViewDebug.CapturedViewProperty 7321 public final int getBottom() { 7322 return mBottom; 7323 } 7324 7325 /** 7326 * True if this view has changed since the last time being drawn. 7327 * 7328 * @return The dirty state of this view. 7329 */ 7330 public boolean isDirty() { 7331 return (mPrivateFlags & DIRTY_MASK) != 0; 7332 } 7333 7334 /** 7335 * Sets the bottom position of this view relative to its parent. This method is meant to be 7336 * called by the layout system and should not generally be called otherwise, because the 7337 * property may be changed at any time by the layout. 7338 * 7339 * @param bottom The bottom of this view, in pixels. 7340 */ 7341 public final void setBottom(int bottom) { 7342 if (bottom != mBottom) { 7343 updateMatrix(); 7344 if (mMatrixIsIdentity) { 7345 if (mAttachInfo != null) { 7346 int maxBottom; 7347 if (bottom < mBottom) { 7348 maxBottom = mBottom; 7349 } else { 7350 maxBottom = bottom; 7351 } 7352 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 7353 } 7354 } else { 7355 // Double-invalidation is necessary to capture view's old and new areas 7356 invalidate(true); 7357 } 7358 7359 int width = mRight - mLeft; 7360 int oldHeight = mBottom - mTop; 7361 7362 mBottom = bottom; 7363 7364 onSizeChanged(width, mBottom - mTop, width, oldHeight); 7365 7366 if (!mMatrixIsIdentity) { 7367 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7368 // A change in dimension means an auto-centered pivot point changes, too 7369 mMatrixDirty = true; 7370 } 7371 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7372 invalidate(true); 7373 } 7374 mBackgroundSizeChanged = true; 7375 invalidateParentIfNeeded(); 7376 } 7377 } 7378 7379 /** 7380 * Left position of this view relative to its parent. 7381 * 7382 * @return The left edge of this view, in pixels. 7383 */ 7384 @ViewDebug.CapturedViewProperty 7385 public final int getLeft() { 7386 return mLeft; 7387 } 7388 7389 /** 7390 * Sets the left position of this view relative to its parent. This method is meant to be called 7391 * by the layout system and should not generally be called otherwise, because the property 7392 * may be changed at any time by the layout. 7393 * 7394 * @param left The bottom of this view, in pixels. 7395 */ 7396 public final void setLeft(int left) { 7397 if (left != mLeft) { 7398 updateMatrix(); 7399 if (mMatrixIsIdentity) { 7400 if (mAttachInfo != null) { 7401 int minLeft; 7402 int xLoc; 7403 if (left < mLeft) { 7404 minLeft = left; 7405 xLoc = left - mLeft; 7406 } else { 7407 minLeft = mLeft; 7408 xLoc = 0; 7409 } 7410 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 7411 } 7412 } else { 7413 // Double-invalidation is necessary to capture view's old and new areas 7414 invalidate(true); 7415 } 7416 7417 int oldWidth = mRight - mLeft; 7418 int height = mBottom - mTop; 7419 7420 mLeft = left; 7421 7422 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7423 7424 if (!mMatrixIsIdentity) { 7425 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7426 // A change in dimension means an auto-centered pivot point changes, too 7427 mMatrixDirty = true; 7428 } 7429 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7430 invalidate(true); 7431 } 7432 mBackgroundSizeChanged = true; 7433 invalidateParentIfNeeded(); 7434 } 7435 } 7436 7437 /** 7438 * Right position of this view relative to its parent. 7439 * 7440 * @return The right edge of this view, in pixels. 7441 */ 7442 @ViewDebug.CapturedViewProperty 7443 public final int getRight() { 7444 return mRight; 7445 } 7446 7447 /** 7448 * Sets the right position of this view relative to its parent. This method is meant to be called 7449 * by the layout system and should not generally be called otherwise, because the property 7450 * may be changed at any time by the layout. 7451 * 7452 * @param right The bottom of this view, in pixels. 7453 */ 7454 public final void setRight(int right) { 7455 if (right != mRight) { 7456 updateMatrix(); 7457 if (mMatrixIsIdentity) { 7458 if (mAttachInfo != null) { 7459 int maxRight; 7460 if (right < mRight) { 7461 maxRight = mRight; 7462 } else { 7463 maxRight = right; 7464 } 7465 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 7466 } 7467 } else { 7468 // Double-invalidation is necessary to capture view's old and new areas 7469 invalidate(true); 7470 } 7471 7472 int oldWidth = mRight - mLeft; 7473 int height = mBottom - mTop; 7474 7475 mRight = right; 7476 7477 onSizeChanged(mRight - mLeft, height, oldWidth, height); 7478 7479 if (!mMatrixIsIdentity) { 7480 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 7481 // A change in dimension means an auto-centered pivot point changes, too 7482 mMatrixDirty = true; 7483 } 7484 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7485 invalidate(true); 7486 } 7487 mBackgroundSizeChanged = true; 7488 invalidateParentIfNeeded(); 7489 } 7490 } 7491 7492 /** 7493 * The visual x position of this view, in pixels. This is equivalent to the 7494 * {@link #setTranslationX(float) translationX} property plus the current 7495 * {@link #getLeft() left} property. 7496 * 7497 * @return The visual x position of this view, in pixels. 7498 */ 7499 public float getX() { 7500 return mLeft + mTranslationX; 7501 } 7502 7503 /** 7504 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 7505 * {@link #setTranslationX(float) translationX} property to be the difference between 7506 * the x value passed in and the current {@link #getLeft() left} property. 7507 * 7508 * @param x The visual x position of this view, in pixels. 7509 */ 7510 public void setX(float x) { 7511 setTranslationX(x - mLeft); 7512 } 7513 7514 /** 7515 * The visual y position of this view, in pixels. This is equivalent to the 7516 * {@link #setTranslationY(float) translationY} property plus the current 7517 * {@link #getTop() top} property. 7518 * 7519 * @return The visual y position of this view, in pixels. 7520 */ 7521 public float getY() { 7522 return mTop + mTranslationY; 7523 } 7524 7525 /** 7526 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 7527 * {@link #setTranslationY(float) translationY} property to be the difference between 7528 * the y value passed in and the current {@link #getTop() top} property. 7529 * 7530 * @param y The visual y position of this view, in pixels. 7531 */ 7532 public void setY(float y) { 7533 setTranslationY(y - mTop); 7534 } 7535 7536 7537 /** 7538 * The horizontal location of this view relative to its {@link #getLeft() left} position. 7539 * This position is post-layout, in addition to wherever the object's 7540 * layout placed it. 7541 * 7542 * @return The horizontal position of this view relative to its left position, in pixels. 7543 */ 7544 public float getTranslationX() { 7545 return mTranslationX; 7546 } 7547 7548 /** 7549 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 7550 * This effectively positions the object post-layout, in addition to wherever the object's 7551 * layout placed it. 7552 * 7553 * @param translationX The horizontal position of this view relative to its left position, 7554 * in pixels. 7555 * 7556 * @attr ref android.R.styleable#View_translationX 7557 */ 7558 public void setTranslationX(float translationX) { 7559 if (mTranslationX != translationX) { 7560 invalidateParentCaches(); 7561 // Double-invalidation is necessary to capture view's old and new areas 7562 invalidate(false); 7563 mTranslationX = translationX; 7564 mMatrixDirty = true; 7565 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7566 invalidate(false); 7567 } 7568 } 7569 7570 /** 7571 * The horizontal location of this view relative to its {@link #getTop() top} position. 7572 * This position is post-layout, in addition to wherever the object's 7573 * layout placed it. 7574 * 7575 * @return The vertical position of this view relative to its top position, 7576 * in pixels. 7577 */ 7578 public float getTranslationY() { 7579 return mTranslationY; 7580 } 7581 7582 /** 7583 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 7584 * This effectively positions the object post-layout, in addition to wherever the object's 7585 * layout placed it. 7586 * 7587 * @param translationY The vertical position of this view relative to its top position, 7588 * in pixels. 7589 * 7590 * @attr ref android.R.styleable#View_translationY 7591 */ 7592 public void setTranslationY(float translationY) { 7593 if (mTranslationY != translationY) { 7594 invalidateParentCaches(); 7595 // Double-invalidation is necessary to capture view's old and new areas 7596 invalidate(false); 7597 mTranslationY = translationY; 7598 mMatrixDirty = true; 7599 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7600 invalidate(false); 7601 } 7602 } 7603 7604 /** 7605 * @hide 7606 */ 7607 public void setFastTranslationX(float x) { 7608 mTranslationX = x; 7609 mMatrixDirty = true; 7610 } 7611 7612 /** 7613 * @hide 7614 */ 7615 public void setFastTranslationY(float y) { 7616 mTranslationY = y; 7617 mMatrixDirty = true; 7618 } 7619 7620 /** 7621 * @hide 7622 */ 7623 public void setFastX(float x) { 7624 mTranslationX = x - mLeft; 7625 mMatrixDirty = true; 7626 } 7627 7628 /** 7629 * @hide 7630 */ 7631 public void setFastY(float y) { 7632 mTranslationY = y - mTop; 7633 mMatrixDirty = true; 7634 } 7635 7636 /** 7637 * @hide 7638 */ 7639 public void setFastScaleX(float x) { 7640 mScaleX = x; 7641 mMatrixDirty = true; 7642 } 7643 7644 /** 7645 * @hide 7646 */ 7647 public void setFastScaleY(float y) { 7648 mScaleY = y; 7649 mMatrixDirty = true; 7650 } 7651 7652 /** 7653 * @hide 7654 */ 7655 public void setFastAlpha(float alpha) { 7656 mAlpha = alpha; 7657 } 7658 7659 /** 7660 * @hide 7661 */ 7662 public void setFastRotationY(float y) { 7663 mRotationY = y; 7664 mMatrixDirty = true; 7665 } 7666 7667 /** 7668 * Hit rectangle in parent's coordinates 7669 * 7670 * @param outRect The hit rectangle of the view. 7671 */ 7672 public void getHitRect(Rect outRect) { 7673 updateMatrix(); 7674 if (mMatrixIsIdentity || mAttachInfo == null) { 7675 outRect.set(mLeft, mTop, mRight, mBottom); 7676 } else { 7677 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 7678 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 7679 mMatrix.mapRect(tmpRect); 7680 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 7681 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 7682 } 7683 } 7684 7685 /** 7686 * Determines whether the given point, in local coordinates is inside the view. 7687 */ 7688 /*package*/ final boolean pointInView(float localX, float localY) { 7689 return localX >= 0 && localX < (mRight - mLeft) 7690 && localY >= 0 && localY < (mBottom - mTop); 7691 } 7692 7693 /** 7694 * Utility method to determine whether the given point, in local coordinates, 7695 * is inside the view, where the area of the view is expanded by the slop factor. 7696 * This method is called while processing touch-move events to determine if the event 7697 * is still within the view. 7698 */ 7699 private boolean pointInView(float localX, float localY, float slop) { 7700 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 7701 localY < ((mBottom - mTop) + slop); 7702 } 7703 7704 /** 7705 * When a view has focus and the user navigates away from it, the next view is searched for 7706 * starting from the rectangle filled in by this method. 7707 * 7708 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 7709 * of the view. However, if your view maintains some idea of internal selection, 7710 * such as a cursor, or a selected row or column, you should override this method and 7711 * fill in a more specific rectangle. 7712 * 7713 * @param r The rectangle to fill in, in this view's coordinates. 7714 */ 7715 public void getFocusedRect(Rect r) { 7716 getDrawingRect(r); 7717 } 7718 7719 /** 7720 * If some part of this view is not clipped by any of its parents, then 7721 * return that area in r in global (root) coordinates. To convert r to local 7722 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 7723 * -globalOffset.y)) If the view is completely clipped or translated out, 7724 * return false. 7725 * 7726 * @param r If true is returned, r holds the global coordinates of the 7727 * visible portion of this view. 7728 * @param globalOffset If true is returned, globalOffset holds the dx,dy 7729 * between this view and its root. globalOffet may be null. 7730 * @return true if r is non-empty (i.e. part of the view is visible at the 7731 * root level. 7732 */ 7733 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 7734 int width = mRight - mLeft; 7735 int height = mBottom - mTop; 7736 if (width > 0 && height > 0) { 7737 r.set(0, 0, width, height); 7738 if (globalOffset != null) { 7739 globalOffset.set(-mScrollX, -mScrollY); 7740 } 7741 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 7742 } 7743 return false; 7744 } 7745 7746 public final boolean getGlobalVisibleRect(Rect r) { 7747 return getGlobalVisibleRect(r, null); 7748 } 7749 7750 public final boolean getLocalVisibleRect(Rect r) { 7751 Point offset = new Point(); 7752 if (getGlobalVisibleRect(r, offset)) { 7753 r.offset(-offset.x, -offset.y); // make r local 7754 return true; 7755 } 7756 return false; 7757 } 7758 7759 /** 7760 * Offset this view's vertical location by the specified number of pixels. 7761 * 7762 * @param offset the number of pixels to offset the view by 7763 */ 7764 public void offsetTopAndBottom(int offset) { 7765 if (offset != 0) { 7766 updateMatrix(); 7767 if (mMatrixIsIdentity) { 7768 final ViewParent p = mParent; 7769 if (p != null && mAttachInfo != null) { 7770 final Rect r = mAttachInfo.mTmpInvalRect; 7771 int minTop; 7772 int maxBottom; 7773 int yLoc; 7774 if (offset < 0) { 7775 minTop = mTop + offset; 7776 maxBottom = mBottom; 7777 yLoc = offset; 7778 } else { 7779 minTop = mTop; 7780 maxBottom = mBottom + offset; 7781 yLoc = 0; 7782 } 7783 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 7784 p.invalidateChild(this, r); 7785 } 7786 } else { 7787 invalidate(false); 7788 } 7789 7790 mTop += offset; 7791 mBottom += offset; 7792 7793 if (!mMatrixIsIdentity) { 7794 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7795 invalidate(false); 7796 } 7797 invalidateParentIfNeeded(); 7798 } 7799 } 7800 7801 /** 7802 * Offset this view's horizontal location by the specified amount of pixels. 7803 * 7804 * @param offset the numer of pixels to offset the view by 7805 */ 7806 public void offsetLeftAndRight(int offset) { 7807 if (offset != 0) { 7808 updateMatrix(); 7809 if (mMatrixIsIdentity) { 7810 final ViewParent p = mParent; 7811 if (p != null && mAttachInfo != null) { 7812 final Rect r = mAttachInfo.mTmpInvalRect; 7813 int minLeft; 7814 int maxRight; 7815 if (offset < 0) { 7816 minLeft = mLeft + offset; 7817 maxRight = mRight; 7818 } else { 7819 minLeft = mLeft; 7820 maxRight = mRight + offset; 7821 } 7822 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 7823 p.invalidateChild(this, r); 7824 } 7825 } else { 7826 invalidate(false); 7827 } 7828 7829 mLeft += offset; 7830 mRight += offset; 7831 7832 if (!mMatrixIsIdentity) { 7833 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 7834 invalidate(false); 7835 } 7836 invalidateParentIfNeeded(); 7837 } 7838 } 7839 7840 /** 7841 * Get the LayoutParams associated with this view. All views should have 7842 * layout parameters. These supply parameters to the <i>parent</i> of this 7843 * view specifying how it should be arranged. There are many subclasses of 7844 * ViewGroup.LayoutParams, and these correspond to the different subclasses 7845 * of ViewGroup that are responsible for arranging their children. 7846 * 7847 * This method may return null if this View is not attached to a parent 7848 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 7849 * was not invoked successfully. When a View is attached to a parent 7850 * ViewGroup, this method must not return null. 7851 * 7852 * @return The LayoutParams associated with this view, or null if no 7853 * parameters have been set yet 7854 */ 7855 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 7856 public ViewGroup.LayoutParams getLayoutParams() { 7857 return mLayoutParams; 7858 } 7859 7860 /** 7861 * Set the layout parameters associated with this view. These supply 7862 * parameters to the <i>parent</i> of this view specifying how it should be 7863 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 7864 * correspond to the different subclasses of ViewGroup that are responsible 7865 * for arranging their children. 7866 * 7867 * @param params The layout parameters for this view, cannot be null 7868 */ 7869 public void setLayoutParams(ViewGroup.LayoutParams params) { 7870 if (params == null) { 7871 throw new NullPointerException("Layout parameters cannot be null"); 7872 } 7873 mLayoutParams = params; 7874 requestLayout(); 7875 } 7876 7877 /** 7878 * Set the scrolled position of your view. This will cause a call to 7879 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7880 * invalidated. 7881 * @param x the x position to scroll to 7882 * @param y the y position to scroll to 7883 */ 7884 public void scrollTo(int x, int y) { 7885 if (mScrollX != x || mScrollY != y) { 7886 int oldX = mScrollX; 7887 int oldY = mScrollY; 7888 mScrollX = x; 7889 mScrollY = y; 7890 invalidateParentCaches(); 7891 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 7892 if (!awakenScrollBars()) { 7893 invalidate(true); 7894 } 7895 } 7896 } 7897 7898 /** 7899 * Move the scrolled position of your view. This will cause a call to 7900 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7901 * invalidated. 7902 * @param x the amount of pixels to scroll by horizontally 7903 * @param y the amount of pixels to scroll by vertically 7904 */ 7905 public void scrollBy(int x, int y) { 7906 scrollTo(mScrollX + x, mScrollY + y); 7907 } 7908 7909 /** 7910 * <p>Trigger the scrollbars to draw. When invoked this method starts an 7911 * animation to fade the scrollbars out after a default delay. If a subclass 7912 * provides animated scrolling, the start delay should equal the duration 7913 * of the scrolling animation.</p> 7914 * 7915 * <p>The animation starts only if at least one of the scrollbars is 7916 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 7917 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7918 * this method returns true, and false otherwise. If the animation is 7919 * started, this method calls {@link #invalidate()}; in that case the 7920 * caller should not call {@link #invalidate()}.</p> 7921 * 7922 * <p>This method should be invoked every time a subclass directly updates 7923 * the scroll parameters.</p> 7924 * 7925 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 7926 * and {@link #scrollTo(int, int)}.</p> 7927 * 7928 * @return true if the animation is played, false otherwise 7929 * 7930 * @see #awakenScrollBars(int) 7931 * @see #scrollBy(int, int) 7932 * @see #scrollTo(int, int) 7933 * @see #isHorizontalScrollBarEnabled() 7934 * @see #isVerticalScrollBarEnabled() 7935 * @see #setHorizontalScrollBarEnabled(boolean) 7936 * @see #setVerticalScrollBarEnabled(boolean) 7937 */ 7938 protected boolean awakenScrollBars() { 7939 return mScrollCache != null && 7940 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 7941 } 7942 7943 /** 7944 * Trigger the scrollbars to draw. 7945 * This method differs from awakenScrollBars() only in its default duration. 7946 * initialAwakenScrollBars() will show the scroll bars for longer than 7947 * usual to give the user more of a chance to notice them. 7948 * 7949 * @return true if the animation is played, false otherwise. 7950 */ 7951 private boolean initialAwakenScrollBars() { 7952 return mScrollCache != null && 7953 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 7954 } 7955 7956 /** 7957 * <p> 7958 * Trigger the scrollbars to draw. When invoked this method starts an 7959 * animation to fade the scrollbars out after a fixed delay. If a subclass 7960 * provides animated scrolling, the start delay should equal the duration of 7961 * the scrolling animation. 7962 * </p> 7963 * 7964 * <p> 7965 * The animation starts only if at least one of the scrollbars is enabled, 7966 * as specified by {@link #isHorizontalScrollBarEnabled()} and 7967 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 7968 * this method returns true, and false otherwise. If the animation is 7969 * started, this method calls {@link #invalidate()}; in that case the caller 7970 * should not call {@link #invalidate()}. 7971 * </p> 7972 * 7973 * <p> 7974 * This method should be invoked everytime a subclass directly updates the 7975 * scroll parameters. 7976 * </p> 7977 * 7978 * @param startDelay the delay, in milliseconds, after which the animation 7979 * should start; when the delay is 0, the animation starts 7980 * immediately 7981 * @return true if the animation is played, false otherwise 7982 * 7983 * @see #scrollBy(int, int) 7984 * @see #scrollTo(int, int) 7985 * @see #isHorizontalScrollBarEnabled() 7986 * @see #isVerticalScrollBarEnabled() 7987 * @see #setHorizontalScrollBarEnabled(boolean) 7988 * @see #setVerticalScrollBarEnabled(boolean) 7989 */ 7990 protected boolean awakenScrollBars(int startDelay) { 7991 return awakenScrollBars(startDelay, true); 7992 } 7993 7994 /** 7995 * <p> 7996 * Trigger the scrollbars to draw. When invoked this method starts an 7997 * animation to fade the scrollbars out after a fixed delay. If a subclass 7998 * provides animated scrolling, the start delay should equal the duration of 7999 * the scrolling animation. 8000 * </p> 8001 * 8002 * <p> 8003 * The animation starts only if at least one of the scrollbars is enabled, 8004 * as specified by {@link #isHorizontalScrollBarEnabled()} and 8005 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 8006 * this method returns true, and false otherwise. If the animation is 8007 * started, this method calls {@link #invalidate()} if the invalidate parameter 8008 * is set to true; in that case the caller 8009 * should not call {@link #invalidate()}. 8010 * </p> 8011 * 8012 * <p> 8013 * This method should be invoked everytime a subclass directly updates the 8014 * scroll parameters. 8015 * </p> 8016 * 8017 * @param startDelay the delay, in milliseconds, after which the animation 8018 * should start; when the delay is 0, the animation starts 8019 * immediately 8020 * 8021 * @param invalidate Wheter this method should call invalidate 8022 * 8023 * @return true if the animation is played, false otherwise 8024 * 8025 * @see #scrollBy(int, int) 8026 * @see #scrollTo(int, int) 8027 * @see #isHorizontalScrollBarEnabled() 8028 * @see #isVerticalScrollBarEnabled() 8029 * @see #setHorizontalScrollBarEnabled(boolean) 8030 * @see #setVerticalScrollBarEnabled(boolean) 8031 */ 8032 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 8033 final ScrollabilityCache scrollCache = mScrollCache; 8034 8035 if (scrollCache == null || !scrollCache.fadeScrollBars) { 8036 return false; 8037 } 8038 8039 if (scrollCache.scrollBar == null) { 8040 scrollCache.scrollBar = new ScrollBarDrawable(); 8041 } 8042 8043 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 8044 8045 if (invalidate) { 8046 // Invalidate to show the scrollbars 8047 invalidate(true); 8048 } 8049 8050 if (scrollCache.state == ScrollabilityCache.OFF) { 8051 // FIXME: this is copied from WindowManagerService. 8052 // We should get this value from the system when it 8053 // is possible to do so. 8054 final int KEY_REPEAT_FIRST_DELAY = 750; 8055 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 8056 } 8057 8058 // Tell mScrollCache when we should start fading. This may 8059 // extend the fade start time if one was already scheduled 8060 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 8061 scrollCache.fadeStartTime = fadeStartTime; 8062 scrollCache.state = ScrollabilityCache.ON; 8063 8064 // Schedule our fader to run, unscheduling any old ones first 8065 if (mAttachInfo != null) { 8066 mAttachInfo.mHandler.removeCallbacks(scrollCache); 8067 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 8068 } 8069 8070 return true; 8071 } 8072 8073 return false; 8074 } 8075 8076 /** 8077 * Mark the the area defined by dirty as needing to be drawn. If the view is 8078 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 8079 * in the future. This must be called from a UI thread. To call from a non-UI 8080 * thread, call {@link #postInvalidate()}. 8081 * 8082 * WARNING: This method is destructive to dirty. 8083 * @param dirty the rectangle representing the bounds of the dirty region 8084 */ 8085 public void invalidate(Rect dirty) { 8086 if (ViewDebug.TRACE_HIERARCHY) { 8087 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8088 } 8089 8090 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null) { 8091 // Noop for views which are not visible and which are not running an animation. They 8092 // will not get drawn and they should not set dirty flags as if they will be drawn 8093 return; 8094 } 8095 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8096 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8097 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8098 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8099 mPrivateFlags |= INVALIDATED; 8100 final ViewParent p = mParent; 8101 final AttachInfo ai = mAttachInfo; 8102 //noinspection PointlessBooleanExpression,ConstantConditions 8103 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8104 if (p != null && ai != null && ai.mHardwareAccelerated) { 8105 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8106 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8107 p.invalidateChild(this, null); 8108 return; 8109 } 8110 } 8111 if (p != null && ai != null) { 8112 final int scrollX = mScrollX; 8113 final int scrollY = mScrollY; 8114 final Rect r = ai.mTmpInvalRect; 8115 r.set(dirty.left - scrollX, dirty.top - scrollY, 8116 dirty.right - scrollX, dirty.bottom - scrollY); 8117 mParent.invalidateChild(this, r); 8118 } 8119 } 8120 } 8121 8122 /** 8123 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 8124 * The coordinates of the dirty rect are relative to the view. 8125 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 8126 * will be called at some point in the future. This must be called from 8127 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 8128 * @param l the left position of the dirty region 8129 * @param t the top position of the dirty region 8130 * @param r the right position of the dirty region 8131 * @param b the bottom position of the dirty region 8132 */ 8133 public void invalidate(int l, int t, int r, int b) { 8134 if (ViewDebug.TRACE_HIERARCHY) { 8135 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8136 } 8137 8138 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null) { 8139 // Noop for views which are not visible and which are not running an animation. They 8140 // will not get drawn and they should not set dirty flags as if they will be drawn 8141 return; 8142 } 8143 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8144 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8145 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8146 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8147 mPrivateFlags |= INVALIDATED; 8148 final ViewParent p = mParent; 8149 final AttachInfo ai = mAttachInfo; 8150 //noinspection PointlessBooleanExpression,ConstantConditions 8151 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8152 if (p != null && ai != null && ai.mHardwareAccelerated) { 8153 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8154 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8155 p.invalidateChild(this, null); 8156 return; 8157 } 8158 } 8159 if (p != null && ai != null && l < r && t < b) { 8160 final int scrollX = mScrollX; 8161 final int scrollY = mScrollY; 8162 final Rect tmpr = ai.mTmpInvalRect; 8163 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 8164 p.invalidateChild(this, tmpr); 8165 } 8166 } 8167 } 8168 8169 /** 8170 * Invalidate the whole view. If the view is visible, 8171 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 8172 * the future. This must be called from a UI thread. To call from a non-UI thread, 8173 * call {@link #postInvalidate()}. 8174 */ 8175 public void invalidate() { 8176 invalidate(true); 8177 } 8178 8179 /** 8180 * This is where the invalidate() work actually happens. A full invalidate() 8181 * causes the drawing cache to be invalidated, but this function can be called with 8182 * invalidateCache set to false to skip that invalidation step for cases that do not 8183 * need it (for example, a component that remains at the same dimensions with the same 8184 * content). 8185 * 8186 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 8187 * well. This is usually true for a full invalidate, but may be set to false if the 8188 * View's contents or dimensions have not changed. 8189 */ 8190 void invalidate(boolean invalidateCache) { 8191 if (ViewDebug.TRACE_HIERARCHY) { 8192 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 8193 } 8194 8195 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null) { 8196 // Noop for views which are not visible and which are not running an animation. They 8197 // will not get drawn and they should not set dirty flags as if they will be drawn 8198 return; 8199 } 8200 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8201 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 8202 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 8203 mLastIsOpaque = isOpaque(); 8204 mPrivateFlags &= ~DRAWN; 8205 if (invalidateCache) { 8206 mPrivateFlags |= INVALIDATED; 8207 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8208 } 8209 final AttachInfo ai = mAttachInfo; 8210 final ViewParent p = mParent; 8211 //noinspection PointlessBooleanExpression,ConstantConditions 8212 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 8213 if (p != null && ai != null && ai.mHardwareAccelerated) { 8214 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 8215 // with a null dirty rect, which tells the ViewAncestor to redraw everything 8216 p.invalidateChild(this, null); 8217 return; 8218 } 8219 } 8220 8221 if (p != null && ai != null) { 8222 final Rect r = ai.mTmpInvalRect; 8223 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8224 // Don't call invalidate -- we don't want to internally scroll 8225 // our own bounds 8226 p.invalidateChild(this, r); 8227 } 8228 } 8229 } 8230 8231 /** 8232 * @hide 8233 */ 8234 public void fastInvalidate() { 8235 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null) { 8236 // Noop for views which are not visible and which are not running an animation. They 8237 // will not get drawn and they should not set dirty flags as if they will be drawn 8238 return; 8239 } 8240 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 8241 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 8242 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 8243 if (mParent instanceof View) { 8244 ((View) mParent).mPrivateFlags |= INVALIDATED; 8245 } 8246 mPrivateFlags &= ~DRAWN; 8247 mPrivateFlags |= INVALIDATED; 8248 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8249 if (mParent != null && mAttachInfo != null) { 8250 if (mAttachInfo.mHardwareAccelerated) { 8251 mParent.invalidateChild(this, null); 8252 } else { 8253 final Rect r = mAttachInfo.mTmpInvalRect; 8254 r.set(0, 0, mRight - mLeft, mBottom - mTop); 8255 // Don't call invalidate -- we don't want to internally scroll 8256 // our own bounds 8257 mParent.invalidateChild(this, r); 8258 } 8259 } 8260 } 8261 } 8262 8263 /** 8264 * Used to indicate that the parent of this view should clear its caches. This functionality 8265 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8266 * which is necessary when various parent-managed properties of the view change, such as 8267 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 8268 * clears the parent caches and does not causes an invalidate event. 8269 * 8270 * @hide 8271 */ 8272 protected void invalidateParentCaches() { 8273 if (mParent instanceof View) { 8274 ((View) mParent).mPrivateFlags |= INVALIDATED; 8275 } 8276 } 8277 8278 /** 8279 * Used to indicate that the parent of this view should be invalidated. This functionality 8280 * is used to force the parent to rebuild its display list (when hardware-accelerated), 8281 * which is necessary when various parent-managed properties of the view change, such as 8282 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 8283 * an invalidation event to the parent. 8284 * 8285 * @hide 8286 */ 8287 protected void invalidateParentIfNeeded() { 8288 if (isHardwareAccelerated() && mParent instanceof View) { 8289 ((View) mParent).invalidate(true); 8290 } 8291 } 8292 8293 /** 8294 * Indicates whether this View is opaque. An opaque View guarantees that it will 8295 * draw all the pixels overlapping its bounds using a fully opaque color. 8296 * 8297 * Subclasses of View should override this method whenever possible to indicate 8298 * whether an instance is opaque. Opaque Views are treated in a special way by 8299 * the View hierarchy, possibly allowing it to perform optimizations during 8300 * invalidate/draw passes. 8301 * 8302 * @return True if this View is guaranteed to be fully opaque, false otherwise. 8303 */ 8304 @ViewDebug.ExportedProperty(category = "drawing") 8305 public boolean isOpaque() { 8306 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 8307 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 8308 } 8309 8310 /** 8311 * @hide 8312 */ 8313 protected void computeOpaqueFlags() { 8314 // Opaque if: 8315 // - Has a background 8316 // - Background is opaque 8317 // - Doesn't have scrollbars or scrollbars are inside overlay 8318 8319 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 8320 mPrivateFlags |= OPAQUE_BACKGROUND; 8321 } else { 8322 mPrivateFlags &= ~OPAQUE_BACKGROUND; 8323 } 8324 8325 final int flags = mViewFlags; 8326 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 8327 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 8328 mPrivateFlags |= OPAQUE_SCROLLBARS; 8329 } else { 8330 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 8331 } 8332 } 8333 8334 /** 8335 * @hide 8336 */ 8337 protected boolean hasOpaqueScrollbars() { 8338 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 8339 } 8340 8341 /** 8342 * @return A handler associated with the thread running the View. This 8343 * handler can be used to pump events in the UI events queue. 8344 */ 8345 public Handler getHandler() { 8346 if (mAttachInfo != null) { 8347 return mAttachInfo.mHandler; 8348 } 8349 return null; 8350 } 8351 8352 /** 8353 * <p>Causes the Runnable to be added to the message queue. 8354 * The runnable will be run on the user interface thread.</p> 8355 * 8356 * <p>This method can be invoked from outside of the UI thread 8357 * only when this View is attached to a window.</p> 8358 * 8359 * @param action The Runnable that will be executed. 8360 * 8361 * @return Returns true if the Runnable was successfully placed in to the 8362 * message queue. Returns false on failure, usually because the 8363 * looper processing the message queue is exiting. 8364 */ 8365 public boolean post(Runnable action) { 8366 Handler handler; 8367 AttachInfo attachInfo = mAttachInfo; 8368 if (attachInfo != null) { 8369 handler = attachInfo.mHandler; 8370 } else { 8371 // Assume that post will succeed later 8372 ViewRootImpl.getRunQueue().post(action); 8373 return true; 8374 } 8375 8376 return handler.post(action); 8377 } 8378 8379 /** 8380 * <p>Causes the Runnable to be added to the message queue, to be run 8381 * after the specified amount of time elapses. 8382 * The runnable will be run on the user interface thread.</p> 8383 * 8384 * <p>This method can be invoked from outside of the UI thread 8385 * only when this View is attached to a window.</p> 8386 * 8387 * @param action The Runnable that will be executed. 8388 * @param delayMillis The delay (in milliseconds) until the Runnable 8389 * will be executed. 8390 * 8391 * @return true if the Runnable was successfully placed in to the 8392 * message queue. Returns false on failure, usually because the 8393 * looper processing the message queue is exiting. Note that a 8394 * result of true does not mean the Runnable will be processed -- 8395 * if the looper is quit before the delivery time of the message 8396 * occurs then the message will be dropped. 8397 */ 8398 public boolean postDelayed(Runnable action, long delayMillis) { 8399 Handler handler; 8400 AttachInfo attachInfo = mAttachInfo; 8401 if (attachInfo != null) { 8402 handler = attachInfo.mHandler; 8403 } else { 8404 // Assume that post will succeed later 8405 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 8406 return true; 8407 } 8408 8409 return handler.postDelayed(action, delayMillis); 8410 } 8411 8412 /** 8413 * <p>Removes the specified Runnable from the message queue.</p> 8414 * 8415 * <p>This method can be invoked from outside of the UI thread 8416 * only when this View is attached to a window.</p> 8417 * 8418 * @param action The Runnable to remove from the message handling queue 8419 * 8420 * @return true if this view could ask the Handler to remove the Runnable, 8421 * false otherwise. When the returned value is true, the Runnable 8422 * may or may not have been actually removed from the message queue 8423 * (for instance, if the Runnable was not in the queue already.) 8424 */ 8425 public boolean removeCallbacks(Runnable action) { 8426 Handler handler; 8427 AttachInfo attachInfo = mAttachInfo; 8428 if (attachInfo != null) { 8429 handler = attachInfo.mHandler; 8430 } else { 8431 // Assume that post will succeed later 8432 ViewRootImpl.getRunQueue().removeCallbacks(action); 8433 return true; 8434 } 8435 8436 handler.removeCallbacks(action); 8437 return true; 8438 } 8439 8440 /** 8441 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 8442 * Use this to invalidate the View from a non-UI thread.</p> 8443 * 8444 * <p>This method can be invoked from outside of the UI thread 8445 * only when this View is attached to a window.</p> 8446 * 8447 * @see #invalidate() 8448 */ 8449 public void postInvalidate() { 8450 postInvalidateDelayed(0); 8451 } 8452 8453 /** 8454 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8455 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 8456 * 8457 * <p>This method can be invoked from outside of the UI thread 8458 * only when this View is attached to a window.</p> 8459 * 8460 * @param left The left coordinate of the rectangle to invalidate. 8461 * @param top The top coordinate of the rectangle to invalidate. 8462 * @param right The right coordinate of the rectangle to invalidate. 8463 * @param bottom The bottom coordinate of the rectangle to invalidate. 8464 * 8465 * @see #invalidate(int, int, int, int) 8466 * @see #invalidate(Rect) 8467 */ 8468 public void postInvalidate(int left, int top, int right, int bottom) { 8469 postInvalidateDelayed(0, left, top, right, bottom); 8470 } 8471 8472 /** 8473 * <p>Cause an invalidate to happen on a subsequent cycle through the event 8474 * loop. Waits for the specified amount of time.</p> 8475 * 8476 * <p>This method can be invoked from outside of the UI thread 8477 * only when this View is attached to a window.</p> 8478 * 8479 * @param delayMilliseconds the duration in milliseconds to delay the 8480 * invalidation by 8481 */ 8482 public void postInvalidateDelayed(long delayMilliseconds) { 8483 // We try only with the AttachInfo because there's no point in invalidating 8484 // if we are not attached to our window 8485 AttachInfo attachInfo = mAttachInfo; 8486 if (attachInfo != null) { 8487 Message msg = Message.obtain(); 8488 msg.what = AttachInfo.INVALIDATE_MSG; 8489 msg.obj = this; 8490 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8491 } 8492 } 8493 8494 /** 8495 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 8496 * through the event loop. Waits for the specified amount of time.</p> 8497 * 8498 * <p>This method can be invoked from outside of the UI thread 8499 * only when this View is attached to a window.</p> 8500 * 8501 * @param delayMilliseconds the duration in milliseconds to delay the 8502 * invalidation by 8503 * @param left The left coordinate of the rectangle to invalidate. 8504 * @param top The top coordinate of the rectangle to invalidate. 8505 * @param right The right coordinate of the rectangle to invalidate. 8506 * @param bottom The bottom coordinate of the rectangle to invalidate. 8507 */ 8508 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 8509 int right, int bottom) { 8510 8511 // We try only with the AttachInfo because there's no point in invalidating 8512 // if we are not attached to our window 8513 AttachInfo attachInfo = mAttachInfo; 8514 if (attachInfo != null) { 8515 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 8516 info.target = this; 8517 info.left = left; 8518 info.top = top; 8519 info.right = right; 8520 info.bottom = bottom; 8521 8522 final Message msg = Message.obtain(); 8523 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 8524 msg.obj = info; 8525 attachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 8526 } 8527 } 8528 8529 /** 8530 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 8531 * This event is sent at most once every 8532 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 8533 */ 8534 private void postSendViewScrolledAccessibilityEventCallback() { 8535 if (mSendViewScrolledAccessibilityEvent == null) { 8536 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 8537 } 8538 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 8539 mSendViewScrolledAccessibilityEvent.mIsPending = true; 8540 postDelayed(mSendViewScrolledAccessibilityEvent, 8541 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 8542 } 8543 } 8544 8545 /** 8546 * Called by a parent to request that a child update its values for mScrollX 8547 * and mScrollY if necessary. This will typically be done if the child is 8548 * animating a scroll using a {@link android.widget.Scroller Scroller} 8549 * object. 8550 */ 8551 public void computeScroll() { 8552 } 8553 8554 /** 8555 * <p>Indicate whether the horizontal edges are faded when the view is 8556 * scrolled horizontally.</p> 8557 * 8558 * @return true if the horizontal edges should are faded on scroll, false 8559 * otherwise 8560 * 8561 * @see #setHorizontalFadingEdgeEnabled(boolean) 8562 * @attr ref android.R.styleable#View_fadingEdge 8563 */ 8564 public boolean isHorizontalFadingEdgeEnabled() { 8565 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 8566 } 8567 8568 /** 8569 * <p>Define whether the horizontal edges should be faded when this view 8570 * is scrolled horizontally.</p> 8571 * 8572 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 8573 * be faded when the view is scrolled 8574 * horizontally 8575 * 8576 * @see #isHorizontalFadingEdgeEnabled() 8577 * @attr ref android.R.styleable#View_fadingEdge 8578 */ 8579 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 8580 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 8581 if (horizontalFadingEdgeEnabled) { 8582 initScrollCache(); 8583 } 8584 8585 mViewFlags ^= FADING_EDGE_HORIZONTAL; 8586 } 8587 } 8588 8589 /** 8590 * <p>Indicate whether the vertical edges are faded when the view is 8591 * scrolled horizontally.</p> 8592 * 8593 * @return true if the vertical edges should are faded on scroll, false 8594 * otherwise 8595 * 8596 * @see #setVerticalFadingEdgeEnabled(boolean) 8597 * @attr ref android.R.styleable#View_fadingEdge 8598 */ 8599 public boolean isVerticalFadingEdgeEnabled() { 8600 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 8601 } 8602 8603 /** 8604 * <p>Define whether the vertical edges should be faded when this view 8605 * is scrolled vertically.</p> 8606 * 8607 * @param verticalFadingEdgeEnabled true if the vertical edges should 8608 * be faded when the view is scrolled 8609 * vertically 8610 * 8611 * @see #isVerticalFadingEdgeEnabled() 8612 * @attr ref android.R.styleable#View_fadingEdge 8613 */ 8614 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 8615 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 8616 if (verticalFadingEdgeEnabled) { 8617 initScrollCache(); 8618 } 8619 8620 mViewFlags ^= FADING_EDGE_VERTICAL; 8621 } 8622 } 8623 8624 /** 8625 * Returns the strength, or intensity, of the top faded edge. The strength is 8626 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8627 * returns 0.0 or 1.0 but no value in between. 8628 * 8629 * Subclasses should override this method to provide a smoother fade transition 8630 * when scrolling occurs. 8631 * 8632 * @return the intensity of the top fade as a float between 0.0f and 1.0f 8633 */ 8634 protected float getTopFadingEdgeStrength() { 8635 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 8636 } 8637 8638 /** 8639 * Returns the strength, or intensity, of the bottom faded edge. The strength is 8640 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8641 * returns 0.0 or 1.0 but no value in between. 8642 * 8643 * Subclasses should override this method to provide a smoother fade transition 8644 * when scrolling occurs. 8645 * 8646 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 8647 */ 8648 protected float getBottomFadingEdgeStrength() { 8649 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 8650 computeVerticalScrollRange() ? 1.0f : 0.0f; 8651 } 8652 8653 /** 8654 * Returns the strength, or intensity, of the left faded edge. The strength is 8655 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8656 * returns 0.0 or 1.0 but no value in between. 8657 * 8658 * Subclasses should override this method to provide a smoother fade transition 8659 * when scrolling occurs. 8660 * 8661 * @return the intensity of the left fade as a float between 0.0f and 1.0f 8662 */ 8663 protected float getLeftFadingEdgeStrength() { 8664 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 8665 } 8666 8667 /** 8668 * Returns the strength, or intensity, of the right faded edge. The strength is 8669 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 8670 * returns 0.0 or 1.0 but no value in between. 8671 * 8672 * Subclasses should override this method to provide a smoother fade transition 8673 * when scrolling occurs. 8674 * 8675 * @return the intensity of the right fade as a float between 0.0f and 1.0f 8676 */ 8677 protected float getRightFadingEdgeStrength() { 8678 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 8679 computeHorizontalScrollRange() ? 1.0f : 0.0f; 8680 } 8681 8682 /** 8683 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 8684 * scrollbar is not drawn by default.</p> 8685 * 8686 * @return true if the horizontal scrollbar should be painted, false 8687 * otherwise 8688 * 8689 * @see #setHorizontalScrollBarEnabled(boolean) 8690 */ 8691 public boolean isHorizontalScrollBarEnabled() { 8692 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 8693 } 8694 8695 /** 8696 * <p>Define whether the horizontal scrollbar should be drawn or not. The 8697 * scrollbar is not drawn by default.</p> 8698 * 8699 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 8700 * be painted 8701 * 8702 * @see #isHorizontalScrollBarEnabled() 8703 */ 8704 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 8705 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 8706 mViewFlags ^= SCROLLBARS_HORIZONTAL; 8707 computeOpaqueFlags(); 8708 resolvePadding(); 8709 } 8710 } 8711 8712 /** 8713 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 8714 * scrollbar is not drawn by default.</p> 8715 * 8716 * @return true if the vertical scrollbar should be painted, false 8717 * otherwise 8718 * 8719 * @see #setVerticalScrollBarEnabled(boolean) 8720 */ 8721 public boolean isVerticalScrollBarEnabled() { 8722 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 8723 } 8724 8725 /** 8726 * <p>Define whether the vertical scrollbar should be drawn or not. The 8727 * scrollbar is not drawn by default.</p> 8728 * 8729 * @param verticalScrollBarEnabled true if the vertical scrollbar should 8730 * be painted 8731 * 8732 * @see #isVerticalScrollBarEnabled() 8733 */ 8734 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 8735 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 8736 mViewFlags ^= SCROLLBARS_VERTICAL; 8737 computeOpaqueFlags(); 8738 resolvePadding(); 8739 } 8740 } 8741 8742 /** 8743 * @hide 8744 */ 8745 protected void recomputePadding() { 8746 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 8747 } 8748 8749 /** 8750 * Define whether scrollbars will fade when the view is not scrolling. 8751 * 8752 * @param fadeScrollbars wheter to enable fading 8753 * 8754 */ 8755 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 8756 initScrollCache(); 8757 final ScrollabilityCache scrollabilityCache = mScrollCache; 8758 scrollabilityCache.fadeScrollBars = fadeScrollbars; 8759 if (fadeScrollbars) { 8760 scrollabilityCache.state = ScrollabilityCache.OFF; 8761 } else { 8762 scrollabilityCache.state = ScrollabilityCache.ON; 8763 } 8764 } 8765 8766 /** 8767 * 8768 * Returns true if scrollbars will fade when this view is not scrolling 8769 * 8770 * @return true if scrollbar fading is enabled 8771 */ 8772 public boolean isScrollbarFadingEnabled() { 8773 return mScrollCache != null && mScrollCache.fadeScrollBars; 8774 } 8775 8776 /** 8777 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 8778 * inset. When inset, they add to the padding of the view. And the scrollbars 8779 * can be drawn inside the padding area or on the edge of the view. For example, 8780 * if a view has a background drawable and you want to draw the scrollbars 8781 * inside the padding specified by the drawable, you can use 8782 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 8783 * appear at the edge of the view, ignoring the padding, then you can use 8784 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 8785 * @param style the style of the scrollbars. Should be one of 8786 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 8787 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 8788 * @see #SCROLLBARS_INSIDE_OVERLAY 8789 * @see #SCROLLBARS_INSIDE_INSET 8790 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8791 * @see #SCROLLBARS_OUTSIDE_INSET 8792 */ 8793 public void setScrollBarStyle(int style) { 8794 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 8795 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 8796 computeOpaqueFlags(); 8797 resolvePadding(); 8798 } 8799 } 8800 8801 /** 8802 * <p>Returns the current scrollbar style.</p> 8803 * @return the current scrollbar style 8804 * @see #SCROLLBARS_INSIDE_OVERLAY 8805 * @see #SCROLLBARS_INSIDE_INSET 8806 * @see #SCROLLBARS_OUTSIDE_OVERLAY 8807 * @see #SCROLLBARS_OUTSIDE_INSET 8808 */ 8809 @ViewDebug.ExportedProperty(mapping = { 8810 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 8811 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 8812 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 8813 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 8814 }) 8815 public int getScrollBarStyle() { 8816 return mViewFlags & SCROLLBARS_STYLE_MASK; 8817 } 8818 8819 /** 8820 * <p>Compute the horizontal range that the horizontal scrollbar 8821 * represents.</p> 8822 * 8823 * <p>The range is expressed in arbitrary units that must be the same as the 8824 * units used by {@link #computeHorizontalScrollExtent()} and 8825 * {@link #computeHorizontalScrollOffset()}.</p> 8826 * 8827 * <p>The default range is the drawing width of this view.</p> 8828 * 8829 * @return the total horizontal range represented by the horizontal 8830 * scrollbar 8831 * 8832 * @see #computeHorizontalScrollExtent() 8833 * @see #computeHorizontalScrollOffset() 8834 * @see android.widget.ScrollBarDrawable 8835 */ 8836 protected int computeHorizontalScrollRange() { 8837 return getWidth(); 8838 } 8839 8840 /** 8841 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 8842 * within the horizontal range. This value is used to compute the position 8843 * of the thumb within the scrollbar's track.</p> 8844 * 8845 * <p>The range is expressed in arbitrary units that must be the same as the 8846 * units used by {@link #computeHorizontalScrollRange()} and 8847 * {@link #computeHorizontalScrollExtent()}.</p> 8848 * 8849 * <p>The default offset is the scroll offset of this view.</p> 8850 * 8851 * @return the horizontal offset of the scrollbar's thumb 8852 * 8853 * @see #computeHorizontalScrollRange() 8854 * @see #computeHorizontalScrollExtent() 8855 * @see android.widget.ScrollBarDrawable 8856 */ 8857 protected int computeHorizontalScrollOffset() { 8858 return mScrollX; 8859 } 8860 8861 /** 8862 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 8863 * within the horizontal range. This value is used to compute the length 8864 * of the thumb within the scrollbar's track.</p> 8865 * 8866 * <p>The range is expressed in arbitrary units that must be the same as the 8867 * units used by {@link #computeHorizontalScrollRange()} and 8868 * {@link #computeHorizontalScrollOffset()}.</p> 8869 * 8870 * <p>The default extent is the drawing width of this view.</p> 8871 * 8872 * @return the horizontal extent of the scrollbar's thumb 8873 * 8874 * @see #computeHorizontalScrollRange() 8875 * @see #computeHorizontalScrollOffset() 8876 * @see android.widget.ScrollBarDrawable 8877 */ 8878 protected int computeHorizontalScrollExtent() { 8879 return getWidth(); 8880 } 8881 8882 /** 8883 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 8884 * 8885 * <p>The range is expressed in arbitrary units that must be the same as the 8886 * units used by {@link #computeVerticalScrollExtent()} and 8887 * {@link #computeVerticalScrollOffset()}.</p> 8888 * 8889 * @return the total vertical range represented by the vertical scrollbar 8890 * 8891 * <p>The default range is the drawing height of this view.</p> 8892 * 8893 * @see #computeVerticalScrollExtent() 8894 * @see #computeVerticalScrollOffset() 8895 * @see android.widget.ScrollBarDrawable 8896 */ 8897 protected int computeVerticalScrollRange() { 8898 return getHeight(); 8899 } 8900 8901 /** 8902 * <p>Compute the vertical offset of the vertical scrollbar's thumb 8903 * within the horizontal range. This value is used to compute the position 8904 * of the thumb within the scrollbar's track.</p> 8905 * 8906 * <p>The range is expressed in arbitrary units that must be the same as the 8907 * units used by {@link #computeVerticalScrollRange()} and 8908 * {@link #computeVerticalScrollExtent()}.</p> 8909 * 8910 * <p>The default offset is the scroll offset of this view.</p> 8911 * 8912 * @return the vertical offset of the scrollbar's thumb 8913 * 8914 * @see #computeVerticalScrollRange() 8915 * @see #computeVerticalScrollExtent() 8916 * @see android.widget.ScrollBarDrawable 8917 */ 8918 protected int computeVerticalScrollOffset() { 8919 return mScrollY; 8920 } 8921 8922 /** 8923 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 8924 * within the vertical range. This value is used to compute the length 8925 * of the thumb within the scrollbar's track.</p> 8926 * 8927 * <p>The range is expressed in arbitrary units that must be the same as the 8928 * units used by {@link #computeVerticalScrollRange()} and 8929 * {@link #computeVerticalScrollOffset()}.</p> 8930 * 8931 * <p>The default extent is the drawing height of this view.</p> 8932 * 8933 * @return the vertical extent of the scrollbar's thumb 8934 * 8935 * @see #computeVerticalScrollRange() 8936 * @see #computeVerticalScrollOffset() 8937 * @see android.widget.ScrollBarDrawable 8938 */ 8939 protected int computeVerticalScrollExtent() { 8940 return getHeight(); 8941 } 8942 8943 /** 8944 * Check if this view can be scrolled horizontally in a certain direction. 8945 * 8946 * @param direction Negative to check scrolling left, positive to check scrolling right. 8947 * @return true if this view can be scrolled in the specified direction, false otherwise. 8948 */ 8949 public boolean canScrollHorizontally(int direction) { 8950 final int offset = computeHorizontalScrollOffset(); 8951 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 8952 if (range == 0) return false; 8953 if (direction < 0) { 8954 return offset > 0; 8955 } else { 8956 return offset < range - 1; 8957 } 8958 } 8959 8960 /** 8961 * Check if this view can be scrolled vertically in a certain direction. 8962 * 8963 * @param direction Negative to check scrolling up, positive to check scrolling down. 8964 * @return true if this view can be scrolled in the specified direction, false otherwise. 8965 */ 8966 public boolean canScrollVertically(int direction) { 8967 final int offset = computeVerticalScrollOffset(); 8968 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 8969 if (range == 0) return false; 8970 if (direction < 0) { 8971 return offset > 0; 8972 } else { 8973 return offset < range - 1; 8974 } 8975 } 8976 8977 /** 8978 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 8979 * scrollbars are painted only if they have been awakened first.</p> 8980 * 8981 * @param canvas the canvas on which to draw the scrollbars 8982 * 8983 * @see #awakenScrollBars(int) 8984 */ 8985 protected final void onDrawScrollBars(Canvas canvas) { 8986 // scrollbars are drawn only when the animation is running 8987 final ScrollabilityCache cache = mScrollCache; 8988 if (cache != null) { 8989 8990 int state = cache.state; 8991 8992 if (state == ScrollabilityCache.OFF) { 8993 return; 8994 } 8995 8996 boolean invalidate = false; 8997 8998 if (state == ScrollabilityCache.FADING) { 8999 // We're fading -- get our fade interpolation 9000 if (cache.interpolatorValues == null) { 9001 cache.interpolatorValues = new float[1]; 9002 } 9003 9004 float[] values = cache.interpolatorValues; 9005 9006 // Stops the animation if we're done 9007 if (cache.scrollBarInterpolator.timeToValues(values) == 9008 Interpolator.Result.FREEZE_END) { 9009 cache.state = ScrollabilityCache.OFF; 9010 } else { 9011 cache.scrollBar.setAlpha(Math.round(values[0])); 9012 } 9013 9014 // This will make the scroll bars inval themselves after 9015 // drawing. We only want this when we're fading so that 9016 // we prevent excessive redraws 9017 invalidate = true; 9018 } else { 9019 // We're just on -- but we may have been fading before so 9020 // reset alpha 9021 cache.scrollBar.setAlpha(255); 9022 } 9023 9024 9025 final int viewFlags = mViewFlags; 9026 9027 final boolean drawHorizontalScrollBar = 9028 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 9029 final boolean drawVerticalScrollBar = 9030 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 9031 && !isVerticalScrollBarHidden(); 9032 9033 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 9034 final int width = mRight - mLeft; 9035 final int height = mBottom - mTop; 9036 9037 final ScrollBarDrawable scrollBar = cache.scrollBar; 9038 9039 final int scrollX = mScrollX; 9040 final int scrollY = mScrollY; 9041 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 9042 9043 int left, top, right, bottom; 9044 9045 if (drawHorizontalScrollBar) { 9046 int size = scrollBar.getSize(false); 9047 if (size <= 0) { 9048 size = cache.scrollBarSize; 9049 } 9050 9051 scrollBar.setParameters(computeHorizontalScrollRange(), 9052 computeHorizontalScrollOffset(), 9053 computeHorizontalScrollExtent(), false); 9054 final int verticalScrollBarGap = drawVerticalScrollBar ? 9055 getVerticalScrollbarWidth() : 0; 9056 top = scrollY + height - size - (mUserPaddingBottom & inside); 9057 left = scrollX + (mPaddingLeft & inside); 9058 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 9059 bottom = top + size; 9060 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 9061 if (invalidate) { 9062 invalidate(left, top, right, bottom); 9063 } 9064 } 9065 9066 if (drawVerticalScrollBar) { 9067 int size = scrollBar.getSize(true); 9068 if (size <= 0) { 9069 size = cache.scrollBarSize; 9070 } 9071 9072 scrollBar.setParameters(computeVerticalScrollRange(), 9073 computeVerticalScrollOffset(), 9074 computeVerticalScrollExtent(), true); 9075 switch (mVerticalScrollbarPosition) { 9076 default: 9077 case SCROLLBAR_POSITION_DEFAULT: 9078 case SCROLLBAR_POSITION_RIGHT: 9079 left = scrollX + width - size - (mUserPaddingRight & inside); 9080 break; 9081 case SCROLLBAR_POSITION_LEFT: 9082 left = scrollX + (mUserPaddingLeft & inside); 9083 break; 9084 } 9085 top = scrollY + (mPaddingTop & inside); 9086 right = left + size; 9087 bottom = scrollY + height - (mUserPaddingBottom & inside); 9088 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 9089 if (invalidate) { 9090 invalidate(left, top, right, bottom); 9091 } 9092 } 9093 } 9094 } 9095 } 9096 9097 /** 9098 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 9099 * FastScroller is visible. 9100 * @return whether to temporarily hide the vertical scrollbar 9101 * @hide 9102 */ 9103 protected boolean isVerticalScrollBarHidden() { 9104 return false; 9105 } 9106 9107 /** 9108 * <p>Draw the horizontal scrollbar if 9109 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 9110 * 9111 * @param canvas the canvas on which to draw the scrollbar 9112 * @param scrollBar the scrollbar's drawable 9113 * 9114 * @see #isHorizontalScrollBarEnabled() 9115 * @see #computeHorizontalScrollRange() 9116 * @see #computeHorizontalScrollExtent() 9117 * @see #computeHorizontalScrollOffset() 9118 * @see android.widget.ScrollBarDrawable 9119 * @hide 9120 */ 9121 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 9122 int l, int t, int r, int b) { 9123 scrollBar.setBounds(l, t, r, b); 9124 scrollBar.draw(canvas); 9125 } 9126 9127 /** 9128 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 9129 * returns true.</p> 9130 * 9131 * @param canvas the canvas on which to draw the scrollbar 9132 * @param scrollBar the scrollbar's drawable 9133 * 9134 * @see #isVerticalScrollBarEnabled() 9135 * @see #computeVerticalScrollRange() 9136 * @see #computeVerticalScrollExtent() 9137 * @see #computeVerticalScrollOffset() 9138 * @see android.widget.ScrollBarDrawable 9139 * @hide 9140 */ 9141 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 9142 int l, int t, int r, int b) { 9143 scrollBar.setBounds(l, t, r, b); 9144 scrollBar.draw(canvas); 9145 } 9146 9147 /** 9148 * Implement this to do your drawing. 9149 * 9150 * @param canvas the canvas on which the background will be drawn 9151 */ 9152 protected void onDraw(Canvas canvas) { 9153 } 9154 9155 /* 9156 * Caller is responsible for calling requestLayout if necessary. 9157 * (This allows addViewInLayout to not request a new layout.) 9158 */ 9159 void assignParent(ViewParent parent) { 9160 if (mParent == null) { 9161 mParent = parent; 9162 } else if (parent == null) { 9163 mParent = null; 9164 } else { 9165 throw new RuntimeException("view " + this + " being added, but" 9166 + " it already has a parent"); 9167 } 9168 } 9169 9170 /** 9171 * This is called when the view is attached to a window. At this point it 9172 * has a Surface and will start drawing. Note that this function is 9173 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 9174 * however it may be called any time before the first onDraw -- including 9175 * before or after {@link #onMeasure(int, int)}. 9176 * 9177 * @see #onDetachedFromWindow() 9178 */ 9179 protected void onAttachedToWindow() { 9180 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 9181 mParent.requestTransparentRegion(this); 9182 } 9183 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 9184 initialAwakenScrollBars(); 9185 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 9186 } 9187 jumpDrawablesToCurrentState(); 9188 // Order is important here: LayoutDirection MUST be resolved before Padding 9189 // and TextDirection 9190 resolveLayoutDirectionIfNeeded(); 9191 resolvePadding(); 9192 resolveTextDirection(); 9193 if (isFocused()) { 9194 InputMethodManager imm = InputMethodManager.peekInstance(); 9195 imm.focusIn(this); 9196 } 9197 } 9198 9199 /** 9200 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 9201 * that the parent directionality can and will be resolved before its children. 9202 */ 9203 private void resolveLayoutDirectionIfNeeded() { 9204 // Do not resolve if it is not needed 9205 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) == LAYOUT_DIRECTION_RESOLVED) return; 9206 9207 // Clear any previous layout direction resolution 9208 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_RTL; 9209 9210 // Reset also TextDirection as a change into LayoutDirection may impact the selected 9211 // TextDirectionHeuristic 9212 resetResolvedTextDirection(); 9213 9214 // Set resolved depending on layout direction 9215 switch (getLayoutDirection()) { 9216 case LAYOUT_DIRECTION_INHERIT: 9217 // We cannot do the resolution if there is no parent 9218 if (mParent == null) return; 9219 9220 // If this is root view, no need to look at parent's layout dir. 9221 if (mParent instanceof ViewGroup) { 9222 ViewGroup viewGroup = ((ViewGroup) mParent); 9223 9224 // Check if the parent view group can resolve 9225 if (! viewGroup.canResolveLayoutDirection()) { 9226 return; 9227 } 9228 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 9229 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9230 } 9231 } 9232 break; 9233 case LAYOUT_DIRECTION_RTL: 9234 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9235 break; 9236 case LAYOUT_DIRECTION_LOCALE: 9237 if(isLayoutDirectionRtl(Locale.getDefault())) { 9238 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 9239 } 9240 break; 9241 default: 9242 // Nothing to do, LTR by default 9243 } 9244 9245 // Set to resolved 9246 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 9247 } 9248 9249 /** 9250 * @hide 9251 */ 9252 protected void resolvePadding() { 9253 // If the user specified the absolute padding (either with android:padding or 9254 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 9255 // use the default padding or the padding from the background drawable 9256 // (stored at this point in mPadding*) 9257 switch (getResolvedLayoutDirection()) { 9258 case LAYOUT_DIRECTION_RTL: 9259 // Start user padding override Right user padding. Otherwise, if Right user 9260 // padding is not defined, use the default Right padding. If Right user padding 9261 // is defined, just use it. 9262 if (mUserPaddingStart >= 0) { 9263 mUserPaddingRight = mUserPaddingStart; 9264 } else if (mUserPaddingRight < 0) { 9265 mUserPaddingRight = mPaddingRight; 9266 } 9267 if (mUserPaddingEnd >= 0) { 9268 mUserPaddingLeft = mUserPaddingEnd; 9269 } else if (mUserPaddingLeft < 0) { 9270 mUserPaddingLeft = mPaddingLeft; 9271 } 9272 break; 9273 case LAYOUT_DIRECTION_LTR: 9274 default: 9275 // Start user padding override Left user padding. Otherwise, if Left user 9276 // padding is not defined, use the default left padding. If Left user padding 9277 // is defined, just use it. 9278 if (mUserPaddingStart >= 0) { 9279 mUserPaddingLeft = mUserPaddingStart; 9280 } else if (mUserPaddingLeft < 0) { 9281 mUserPaddingLeft = mPaddingLeft; 9282 } 9283 if (mUserPaddingEnd >= 0) { 9284 mUserPaddingRight = mUserPaddingEnd; 9285 } else if (mUserPaddingRight < 0) { 9286 mUserPaddingRight = mPaddingRight; 9287 } 9288 } 9289 9290 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 9291 9292 recomputePadding(); 9293 } 9294 9295 protected boolean canResolveLayoutDirection() { 9296 switch (getLayoutDirection()) { 9297 case LAYOUT_DIRECTION_INHERIT: 9298 return (mParent != null); 9299 default: 9300 return true; 9301 } 9302 } 9303 9304 /** 9305 * Reset the resolved layout direction. 9306 * 9307 * Subclasses need to override this method to clear cached information that depends on the 9308 * resolved layout direction, or to inform child views that inherit their layout direction. 9309 * Overrides must also call the superclass implementation at the start of their implementation. 9310 * 9311 * @hide 9312 */ 9313 protected void resetResolvedLayoutDirection() { 9314 // Reset the current View resolution 9315 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED; 9316 } 9317 9318 /** 9319 * Check if a Locale is corresponding to a RTL script. 9320 * 9321 * @param locale Locale to check 9322 * @return true if a Locale is corresponding to a RTL script. 9323 */ 9324 protected static boolean isLayoutDirectionRtl(Locale locale) { 9325 return (LocaleUtil.TEXT_LAYOUT_DIRECTION_RTL_DO_NOT_USE == 9326 LocaleUtil.getLayoutDirectionFromLocale(locale)); 9327 } 9328 9329 /** 9330 * This is called when the view is detached from a window. At this point it 9331 * no longer has a surface for drawing. 9332 * 9333 * @see #onAttachedToWindow() 9334 */ 9335 protected void onDetachedFromWindow() { 9336 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 9337 9338 removeUnsetPressCallback(); 9339 removeLongPressCallback(); 9340 removePerformClickCallback(); 9341 removeSendViewScrolledAccessibilityEventCallback(); 9342 9343 destroyDrawingCache(); 9344 9345 destroyLayer(); 9346 9347 if (mDisplayList != null) { 9348 mDisplayList.invalidate(); 9349 } 9350 9351 if (mAttachInfo != null) { 9352 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 9353 } 9354 9355 mCurrentAnimation = null; 9356 9357 resetResolvedLayoutDirection(); 9358 resetResolvedTextDirection(); 9359 } 9360 9361 /** 9362 * @return The number of times this view has been attached to a window 9363 */ 9364 protected int getWindowAttachCount() { 9365 return mWindowAttachCount; 9366 } 9367 9368 /** 9369 * Retrieve a unique token identifying the window this view is attached to. 9370 * @return Return the window's token for use in 9371 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 9372 */ 9373 public IBinder getWindowToken() { 9374 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 9375 } 9376 9377 /** 9378 * Retrieve a unique token identifying the top-level "real" window of 9379 * the window that this view is attached to. That is, this is like 9380 * {@link #getWindowToken}, except if the window this view in is a panel 9381 * window (attached to another containing window), then the token of 9382 * the containing window is returned instead. 9383 * 9384 * @return Returns the associated window token, either 9385 * {@link #getWindowToken()} or the containing window's token. 9386 */ 9387 public IBinder getApplicationWindowToken() { 9388 AttachInfo ai = mAttachInfo; 9389 if (ai != null) { 9390 IBinder appWindowToken = ai.mPanelParentWindowToken; 9391 if (appWindowToken == null) { 9392 appWindowToken = ai.mWindowToken; 9393 } 9394 return appWindowToken; 9395 } 9396 return null; 9397 } 9398 9399 /** 9400 * Retrieve private session object this view hierarchy is using to 9401 * communicate with the window manager. 9402 * @return the session object to communicate with the window manager 9403 */ 9404 /*package*/ IWindowSession getWindowSession() { 9405 return mAttachInfo != null ? mAttachInfo.mSession : null; 9406 } 9407 9408 /** 9409 * @param info the {@link android.view.View.AttachInfo} to associated with 9410 * this view 9411 */ 9412 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 9413 //System.out.println("Attached! " + this); 9414 mAttachInfo = info; 9415 mWindowAttachCount++; 9416 // We will need to evaluate the drawable state at least once. 9417 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9418 if (mFloatingTreeObserver != null) { 9419 info.mTreeObserver.merge(mFloatingTreeObserver); 9420 mFloatingTreeObserver = null; 9421 } 9422 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 9423 mAttachInfo.mScrollContainers.add(this); 9424 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 9425 } 9426 performCollectViewAttributes(visibility); 9427 onAttachedToWindow(); 9428 9429 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9430 mOnAttachStateChangeListeners; 9431 if (listeners != null && listeners.size() > 0) { 9432 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9433 // perform the dispatching. The iterator is a safe guard against listeners that 9434 // could mutate the list by calling the various add/remove methods. This prevents 9435 // the array from being modified while we iterate it. 9436 for (OnAttachStateChangeListener listener : listeners) { 9437 listener.onViewAttachedToWindow(this); 9438 } 9439 } 9440 9441 int vis = info.mWindowVisibility; 9442 if (vis != GONE) { 9443 onWindowVisibilityChanged(vis); 9444 } 9445 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 9446 // If nobody has evaluated the drawable state yet, then do it now. 9447 refreshDrawableState(); 9448 } 9449 } 9450 9451 void dispatchDetachedFromWindow() { 9452 AttachInfo info = mAttachInfo; 9453 if (info != null) { 9454 int vis = info.mWindowVisibility; 9455 if (vis != GONE) { 9456 onWindowVisibilityChanged(GONE); 9457 } 9458 } 9459 9460 onDetachedFromWindow(); 9461 9462 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 9463 mOnAttachStateChangeListeners; 9464 if (listeners != null && listeners.size() > 0) { 9465 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 9466 // perform the dispatching. The iterator is a safe guard against listeners that 9467 // could mutate the list by calling the various add/remove methods. This prevents 9468 // the array from being modified while we iterate it. 9469 for (OnAttachStateChangeListener listener : listeners) { 9470 listener.onViewDetachedFromWindow(this); 9471 } 9472 } 9473 9474 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 9475 mAttachInfo.mScrollContainers.remove(this); 9476 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 9477 } 9478 9479 mAttachInfo = null; 9480 } 9481 9482 /** 9483 * Store this view hierarchy's frozen state into the given container. 9484 * 9485 * @param container The SparseArray in which to save the view's state. 9486 * 9487 * @see #restoreHierarchyState(android.util.SparseArray) 9488 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9489 * @see #onSaveInstanceState() 9490 */ 9491 public void saveHierarchyState(SparseArray<Parcelable> container) { 9492 dispatchSaveInstanceState(container); 9493 } 9494 9495 /** 9496 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 9497 * this view and its children. May be overridden to modify how freezing happens to a 9498 * view's children; for example, some views may want to not store state for their children. 9499 * 9500 * @param container The SparseArray in which to save the view's state. 9501 * 9502 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9503 * @see #saveHierarchyState(android.util.SparseArray) 9504 * @see #onSaveInstanceState() 9505 */ 9506 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 9507 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 9508 mPrivateFlags &= ~SAVE_STATE_CALLED; 9509 Parcelable state = onSaveInstanceState(); 9510 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9511 throw new IllegalStateException( 9512 "Derived class did not call super.onSaveInstanceState()"); 9513 } 9514 if (state != null) { 9515 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 9516 // + ": " + state); 9517 container.put(mID, state); 9518 } 9519 } 9520 } 9521 9522 /** 9523 * Hook allowing a view to generate a representation of its internal state 9524 * that can later be used to create a new instance with that same state. 9525 * This state should only contain information that is not persistent or can 9526 * not be reconstructed later. For example, you will never store your 9527 * current position on screen because that will be computed again when a 9528 * new instance of the view is placed in its view hierarchy. 9529 * <p> 9530 * Some examples of things you may store here: the current cursor position 9531 * in a text view (but usually not the text itself since that is stored in a 9532 * content provider or other persistent storage), the currently selected 9533 * item in a list view. 9534 * 9535 * @return Returns a Parcelable object containing the view's current dynamic 9536 * state, or null if there is nothing interesting to save. The 9537 * default implementation returns null. 9538 * @see #onRestoreInstanceState(android.os.Parcelable) 9539 * @see #saveHierarchyState(android.util.SparseArray) 9540 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9541 * @see #setSaveEnabled(boolean) 9542 */ 9543 protected Parcelable onSaveInstanceState() { 9544 mPrivateFlags |= SAVE_STATE_CALLED; 9545 return BaseSavedState.EMPTY_STATE; 9546 } 9547 9548 /** 9549 * Restore this view hierarchy's frozen state from the given container. 9550 * 9551 * @param container The SparseArray which holds previously frozen states. 9552 * 9553 * @see #saveHierarchyState(android.util.SparseArray) 9554 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9555 * @see #onRestoreInstanceState(android.os.Parcelable) 9556 */ 9557 public void restoreHierarchyState(SparseArray<Parcelable> container) { 9558 dispatchRestoreInstanceState(container); 9559 } 9560 9561 /** 9562 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 9563 * state for this view and its children. May be overridden to modify how restoring 9564 * happens to a view's children; for example, some views may want to not store state 9565 * for their children. 9566 * 9567 * @param container The SparseArray which holds previously saved state. 9568 * 9569 * @see #dispatchSaveInstanceState(android.util.SparseArray) 9570 * @see #restoreHierarchyState(android.util.SparseArray) 9571 * @see #onRestoreInstanceState(android.os.Parcelable) 9572 */ 9573 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 9574 if (mID != NO_ID) { 9575 Parcelable state = container.get(mID); 9576 if (state != null) { 9577 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 9578 // + ": " + state); 9579 mPrivateFlags &= ~SAVE_STATE_CALLED; 9580 onRestoreInstanceState(state); 9581 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 9582 throw new IllegalStateException( 9583 "Derived class did not call super.onRestoreInstanceState()"); 9584 } 9585 } 9586 } 9587 } 9588 9589 /** 9590 * Hook allowing a view to re-apply a representation of its internal state that had previously 9591 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 9592 * null state. 9593 * 9594 * @param state The frozen state that had previously been returned by 9595 * {@link #onSaveInstanceState}. 9596 * 9597 * @see #onSaveInstanceState() 9598 * @see #restoreHierarchyState(android.util.SparseArray) 9599 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 9600 */ 9601 protected void onRestoreInstanceState(Parcelable state) { 9602 mPrivateFlags |= SAVE_STATE_CALLED; 9603 if (state != BaseSavedState.EMPTY_STATE && state != null) { 9604 throw new IllegalArgumentException("Wrong state class, expecting View State but " 9605 + "received " + state.getClass().toString() + " instead. This usually happens " 9606 + "when two views of different type have the same id in the same hierarchy. " 9607 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 9608 + "other views do not use the same id."); 9609 } 9610 } 9611 9612 /** 9613 * <p>Return the time at which the drawing of the view hierarchy started.</p> 9614 * 9615 * @return the drawing start time in milliseconds 9616 */ 9617 public long getDrawingTime() { 9618 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 9619 } 9620 9621 /** 9622 * <p>Enables or disables the duplication of the parent's state into this view. When 9623 * duplication is enabled, this view gets its drawable state from its parent rather 9624 * than from its own internal properties.</p> 9625 * 9626 * <p>Note: in the current implementation, setting this property to true after the 9627 * view was added to a ViewGroup might have no effect at all. This property should 9628 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 9629 * 9630 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 9631 * property is enabled, an exception will be thrown.</p> 9632 * 9633 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 9634 * parent, these states should not be affected by this method.</p> 9635 * 9636 * @param enabled True to enable duplication of the parent's drawable state, false 9637 * to disable it. 9638 * 9639 * @see #getDrawableState() 9640 * @see #isDuplicateParentStateEnabled() 9641 */ 9642 public void setDuplicateParentStateEnabled(boolean enabled) { 9643 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 9644 } 9645 9646 /** 9647 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 9648 * 9649 * @return True if this view's drawable state is duplicated from the parent, 9650 * false otherwise 9651 * 9652 * @see #getDrawableState() 9653 * @see #setDuplicateParentStateEnabled(boolean) 9654 */ 9655 public boolean isDuplicateParentStateEnabled() { 9656 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 9657 } 9658 9659 /** 9660 * <p>Specifies the type of layer backing this view. The layer can be 9661 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 9662 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 9663 * 9664 * <p>A layer is associated with an optional {@link android.graphics.Paint} 9665 * instance that controls how the layer is composed on screen. The following 9666 * properties of the paint are taken into account when composing the layer:</p> 9667 * <ul> 9668 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 9669 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 9670 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 9671 * </ul> 9672 * 9673 * <p>If this view has an alpha value set to < 1.0 by calling 9674 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 9675 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 9676 * equivalent to setting a hardware layer on this view and providing a paint with 9677 * the desired alpha value.<p> 9678 * 9679 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 9680 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 9681 * for more information on when and how to use layers.</p> 9682 * 9683 * @param layerType The ype of layer to use with this view, must be one of 9684 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9685 * {@link #LAYER_TYPE_HARDWARE} 9686 * @param paint The paint used to compose the layer. This argument is optional 9687 * and can be null. It is ignored when the layer type is 9688 * {@link #LAYER_TYPE_NONE} 9689 * 9690 * @see #getLayerType() 9691 * @see #LAYER_TYPE_NONE 9692 * @see #LAYER_TYPE_SOFTWARE 9693 * @see #LAYER_TYPE_HARDWARE 9694 * @see #setAlpha(float) 9695 * 9696 * @attr ref android.R.styleable#View_layerType 9697 */ 9698 public void setLayerType(int layerType, Paint paint) { 9699 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 9700 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 9701 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 9702 } 9703 9704 if (layerType == mLayerType) { 9705 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 9706 mLayerPaint = paint == null ? new Paint() : paint; 9707 invalidateParentCaches(); 9708 invalidate(true); 9709 } 9710 return; 9711 } 9712 9713 // Destroy any previous software drawing cache if needed 9714 switch (mLayerType) { 9715 case LAYER_TYPE_HARDWARE: 9716 destroyLayer(); 9717 // fall through - unaccelerated views may use software layer mechanism instead 9718 case LAYER_TYPE_SOFTWARE: 9719 destroyDrawingCache(); 9720 break; 9721 default: 9722 break; 9723 } 9724 9725 mLayerType = layerType; 9726 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 9727 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 9728 mLocalDirtyRect = layerDisabled ? null : new Rect(); 9729 9730 invalidateParentCaches(); 9731 invalidate(true); 9732 } 9733 9734 /** 9735 * Indicates what type of layer is currently associated with this view. By default 9736 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 9737 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 9738 * for more information on the different types of layers. 9739 * 9740 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 9741 * {@link #LAYER_TYPE_HARDWARE} 9742 * 9743 * @see #setLayerType(int, android.graphics.Paint) 9744 * @see #buildLayer() 9745 * @see #LAYER_TYPE_NONE 9746 * @see #LAYER_TYPE_SOFTWARE 9747 * @see #LAYER_TYPE_HARDWARE 9748 */ 9749 public int getLayerType() { 9750 return mLayerType; 9751 } 9752 9753 /** 9754 * Forces this view's layer to be created and this view to be rendered 9755 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 9756 * invoking this method will have no effect. 9757 * 9758 * This method can for instance be used to render a view into its layer before 9759 * starting an animation. If this view is complex, rendering into the layer 9760 * before starting the animation will avoid skipping frames. 9761 * 9762 * @throws IllegalStateException If this view is not attached to a window 9763 * 9764 * @see #setLayerType(int, android.graphics.Paint) 9765 */ 9766 public void buildLayer() { 9767 if (mLayerType == LAYER_TYPE_NONE) return; 9768 9769 if (mAttachInfo == null) { 9770 throw new IllegalStateException("This view must be attached to a window first"); 9771 } 9772 9773 switch (mLayerType) { 9774 case LAYER_TYPE_HARDWARE: 9775 getHardwareLayer(); 9776 break; 9777 case LAYER_TYPE_SOFTWARE: 9778 buildDrawingCache(true); 9779 break; 9780 } 9781 } 9782 9783 /** 9784 * <p>Returns a hardware layer that can be used to draw this view again 9785 * without executing its draw method.</p> 9786 * 9787 * @return A HardwareLayer ready to render, or null if an error occurred. 9788 */ 9789 HardwareLayer getHardwareLayer() { 9790 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 9791 !mAttachInfo.mHardwareRenderer.isEnabled()) { 9792 return null; 9793 } 9794 9795 final int width = mRight - mLeft; 9796 final int height = mBottom - mTop; 9797 9798 if (width == 0 || height == 0) { 9799 return null; 9800 } 9801 9802 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 9803 if (mHardwareLayer == null) { 9804 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 9805 width, height, isOpaque()); 9806 mLocalDirtyRect.setEmpty(); 9807 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 9808 mHardwareLayer.resize(width, height); 9809 mLocalDirtyRect.setEmpty(); 9810 } 9811 9812 HardwareCanvas currentCanvas = mAttachInfo.mHardwareCanvas; 9813 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 9814 mAttachInfo.mHardwareCanvas = canvas; 9815 try { 9816 canvas.setViewport(width, height); 9817 canvas.onPreDraw(mLocalDirtyRect); 9818 mLocalDirtyRect.setEmpty(); 9819 9820 final int restoreCount = canvas.save(); 9821 9822 computeScroll(); 9823 canvas.translate(-mScrollX, -mScrollY); 9824 9825 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9826 9827 // Fast path for layouts with no backgrounds 9828 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 9829 mPrivateFlags &= ~DIRTY_MASK; 9830 dispatchDraw(canvas); 9831 } else { 9832 draw(canvas); 9833 } 9834 9835 canvas.restoreToCount(restoreCount); 9836 } finally { 9837 canvas.onPostDraw(); 9838 mHardwareLayer.end(currentCanvas); 9839 mAttachInfo.mHardwareCanvas = currentCanvas; 9840 } 9841 } 9842 9843 return mHardwareLayer; 9844 } 9845 9846 boolean destroyLayer() { 9847 if (mHardwareLayer != null) { 9848 mHardwareLayer.destroy(); 9849 mHardwareLayer = null; 9850 return true; 9851 } 9852 return false; 9853 } 9854 9855 /** 9856 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 9857 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 9858 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 9859 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 9860 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 9861 * null.</p> 9862 * 9863 * <p>Enabling the drawing cache is similar to 9864 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 9865 * acceleration is turned off. When hardware acceleration is turned on, enabling the 9866 * drawing cache has no effect on rendering because the system uses a different mechanism 9867 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 9868 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 9869 * for information on how to enable software and hardware layers.</p> 9870 * 9871 * <p>This API can be used to manually generate 9872 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 9873 * {@link #getDrawingCache()}.</p> 9874 * 9875 * @param enabled true to enable the drawing cache, false otherwise 9876 * 9877 * @see #isDrawingCacheEnabled() 9878 * @see #getDrawingCache() 9879 * @see #buildDrawingCache() 9880 * @see #setLayerType(int, android.graphics.Paint) 9881 */ 9882 public void setDrawingCacheEnabled(boolean enabled) { 9883 mCachingFailed = false; 9884 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 9885 } 9886 9887 /** 9888 * <p>Indicates whether the drawing cache is enabled for this view.</p> 9889 * 9890 * @return true if the drawing cache is enabled 9891 * 9892 * @see #setDrawingCacheEnabled(boolean) 9893 * @see #getDrawingCache() 9894 */ 9895 @ViewDebug.ExportedProperty(category = "drawing") 9896 public boolean isDrawingCacheEnabled() { 9897 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 9898 } 9899 9900 /** 9901 * Debugging utility which recursively outputs the dirty state of a view and its 9902 * descendants. 9903 * 9904 * @hide 9905 */ 9906 @SuppressWarnings({"UnusedDeclaration"}) 9907 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 9908 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 9909 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 9910 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 9911 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 9912 if (clear) { 9913 mPrivateFlags &= clearMask; 9914 } 9915 if (this instanceof ViewGroup) { 9916 ViewGroup parent = (ViewGroup) this; 9917 final int count = parent.getChildCount(); 9918 for (int i = 0; i < count; i++) { 9919 final View child = parent.getChildAt(i); 9920 child.outputDirtyFlags(indent + " ", clear, clearMask); 9921 } 9922 } 9923 } 9924 9925 /** 9926 * This method is used by ViewGroup to cause its children to restore or recreate their 9927 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 9928 * to recreate its own display list, which would happen if it went through the normal 9929 * draw/dispatchDraw mechanisms. 9930 * 9931 * @hide 9932 */ 9933 protected void dispatchGetDisplayList() {} 9934 9935 /** 9936 * A view that is not attached or hardware accelerated cannot create a display list. 9937 * This method checks these conditions and returns the appropriate result. 9938 * 9939 * @return true if view has the ability to create a display list, false otherwise. 9940 * 9941 * @hide 9942 */ 9943 public boolean canHaveDisplayList() { 9944 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 9945 } 9946 9947 /** 9948 * <p>Returns a display list that can be used to draw this view again 9949 * without executing its draw method.</p> 9950 * 9951 * @return A DisplayList ready to replay, or null if caching is not enabled. 9952 * 9953 * @hide 9954 */ 9955 public DisplayList getDisplayList() { 9956 if (!canHaveDisplayList()) { 9957 return null; 9958 } 9959 9960 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 9961 mDisplayList == null || !mDisplayList.isValid() || 9962 mRecreateDisplayList)) { 9963 // Don't need to recreate the display list, just need to tell our 9964 // children to restore/recreate theirs 9965 if (mDisplayList != null && mDisplayList.isValid() && 9966 !mRecreateDisplayList) { 9967 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9968 mPrivateFlags &= ~DIRTY_MASK; 9969 dispatchGetDisplayList(); 9970 9971 return mDisplayList; 9972 } 9973 9974 // If we got here, we're recreating it. Mark it as such to ensure that 9975 // we copy in child display lists into ours in drawChild() 9976 mRecreateDisplayList = true; 9977 if (mDisplayList == null) { 9978 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 9979 // If we're creating a new display list, make sure our parent gets invalidated 9980 // since they will need to recreate their display list to account for this 9981 // new child display list. 9982 invalidateParentCaches(); 9983 } 9984 9985 final HardwareCanvas canvas = mDisplayList.start(); 9986 try { 9987 int width = mRight - mLeft; 9988 int height = mBottom - mTop; 9989 9990 canvas.setViewport(width, height); 9991 // The dirty rect should always be null for a display list 9992 canvas.onPreDraw(null); 9993 9994 computeScroll(); 9995 canvas.translate(-mScrollX, -mScrollY); 9996 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 9997 mPrivateFlags &= ~DIRTY_MASK; 9998 9999 // Fast path for layouts with no backgrounds 10000 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10001 dispatchDraw(canvas); 10002 } else { 10003 draw(canvas); 10004 } 10005 } finally { 10006 canvas.onPostDraw(); 10007 10008 mDisplayList.end(); 10009 } 10010 } else { 10011 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 10012 mPrivateFlags &= ~DIRTY_MASK; 10013 } 10014 10015 return mDisplayList; 10016 } 10017 10018 /** 10019 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 10020 * 10021 * @return A non-scaled bitmap representing this view or null if cache is disabled. 10022 * 10023 * @see #getDrawingCache(boolean) 10024 */ 10025 public Bitmap getDrawingCache() { 10026 return getDrawingCache(false); 10027 } 10028 10029 /** 10030 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 10031 * is null when caching is disabled. If caching is enabled and the cache is not ready, 10032 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 10033 * draw from the cache when the cache is enabled. To benefit from the cache, you must 10034 * request the drawing cache by calling this method and draw it on screen if the 10035 * returned bitmap is not null.</p> 10036 * 10037 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10038 * this method will create a bitmap of the same size as this view. Because this bitmap 10039 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10040 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10041 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10042 * size than the view. This implies that your application must be able to handle this 10043 * size.</p> 10044 * 10045 * @param autoScale Indicates whether the generated bitmap should be scaled based on 10046 * the current density of the screen when the application is in compatibility 10047 * mode. 10048 * 10049 * @return A bitmap representing this view or null if cache is disabled. 10050 * 10051 * @see #setDrawingCacheEnabled(boolean) 10052 * @see #isDrawingCacheEnabled() 10053 * @see #buildDrawingCache(boolean) 10054 * @see #destroyDrawingCache() 10055 */ 10056 public Bitmap getDrawingCache(boolean autoScale) { 10057 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 10058 return null; 10059 } 10060 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 10061 buildDrawingCache(autoScale); 10062 } 10063 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 10064 } 10065 10066 /** 10067 * <p>Frees the resources used by the drawing cache. If you call 10068 * {@link #buildDrawingCache()} manually without calling 10069 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10070 * should cleanup the cache with this method afterwards.</p> 10071 * 10072 * @see #setDrawingCacheEnabled(boolean) 10073 * @see #buildDrawingCache() 10074 * @see #getDrawingCache() 10075 */ 10076 public void destroyDrawingCache() { 10077 if (mDrawingCache != null) { 10078 mDrawingCache.recycle(); 10079 mDrawingCache = null; 10080 } 10081 if (mUnscaledDrawingCache != null) { 10082 mUnscaledDrawingCache.recycle(); 10083 mUnscaledDrawingCache = null; 10084 } 10085 } 10086 10087 /** 10088 * Setting a solid background color for the drawing cache's bitmaps will improve 10089 * perfromance and memory usage. Note, though that this should only be used if this 10090 * view will always be drawn on top of a solid color. 10091 * 10092 * @param color The background color to use for the drawing cache's bitmap 10093 * 10094 * @see #setDrawingCacheEnabled(boolean) 10095 * @see #buildDrawingCache() 10096 * @see #getDrawingCache() 10097 */ 10098 public void setDrawingCacheBackgroundColor(int color) { 10099 if (color != mDrawingCacheBackgroundColor) { 10100 mDrawingCacheBackgroundColor = color; 10101 mPrivateFlags &= ~DRAWING_CACHE_VALID; 10102 } 10103 } 10104 10105 /** 10106 * @see #setDrawingCacheBackgroundColor(int) 10107 * 10108 * @return The background color to used for the drawing cache's bitmap 10109 */ 10110 public int getDrawingCacheBackgroundColor() { 10111 return mDrawingCacheBackgroundColor; 10112 } 10113 10114 /** 10115 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 10116 * 10117 * @see #buildDrawingCache(boolean) 10118 */ 10119 public void buildDrawingCache() { 10120 buildDrawingCache(false); 10121 } 10122 10123 /** 10124 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 10125 * 10126 * <p>If you call {@link #buildDrawingCache()} manually without calling 10127 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 10128 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 10129 * 10130 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 10131 * this method will create a bitmap of the same size as this view. Because this bitmap 10132 * will be drawn scaled by the parent ViewGroup, the result on screen might show 10133 * scaling artifacts. To avoid such artifacts, you should call this method by setting 10134 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 10135 * size than the view. This implies that your application must be able to handle this 10136 * size.</p> 10137 * 10138 * <p>You should avoid calling this method when hardware acceleration is enabled. If 10139 * you do not need the drawing cache bitmap, calling this method will increase memory 10140 * usage and cause the view to be rendered in software once, thus negatively impacting 10141 * performance.</p> 10142 * 10143 * @see #getDrawingCache() 10144 * @see #destroyDrawingCache() 10145 */ 10146 public void buildDrawingCache(boolean autoScale) { 10147 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 10148 mDrawingCache == null : mUnscaledDrawingCache == null)) { 10149 mCachingFailed = false; 10150 10151 if (ViewDebug.TRACE_HIERARCHY) { 10152 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 10153 } 10154 10155 int width = mRight - mLeft; 10156 int height = mBottom - mTop; 10157 10158 final AttachInfo attachInfo = mAttachInfo; 10159 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 10160 10161 if (autoScale && scalingRequired) { 10162 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 10163 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 10164 } 10165 10166 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 10167 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 10168 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 10169 10170 if (width <= 0 || height <= 0 || 10171 // Projected bitmap size in bytes 10172 (width * height * (opaque && !use32BitCache ? 2 : 4) > 10173 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 10174 destroyDrawingCache(); 10175 mCachingFailed = true; 10176 return; 10177 } 10178 10179 boolean clear = true; 10180 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 10181 10182 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 10183 Bitmap.Config quality; 10184 if (!opaque) { 10185 // Never pick ARGB_4444 because it looks awful 10186 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 10187 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 10188 case DRAWING_CACHE_QUALITY_AUTO: 10189 quality = Bitmap.Config.ARGB_8888; 10190 break; 10191 case DRAWING_CACHE_QUALITY_LOW: 10192 quality = Bitmap.Config.ARGB_8888; 10193 break; 10194 case DRAWING_CACHE_QUALITY_HIGH: 10195 quality = Bitmap.Config.ARGB_8888; 10196 break; 10197 default: 10198 quality = Bitmap.Config.ARGB_8888; 10199 break; 10200 } 10201 } else { 10202 // Optimization for translucent windows 10203 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 10204 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 10205 } 10206 10207 // Try to cleanup memory 10208 if (bitmap != null) bitmap.recycle(); 10209 10210 try { 10211 bitmap = Bitmap.createBitmap(width, height, quality); 10212 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10213 if (autoScale) { 10214 mDrawingCache = bitmap; 10215 } else { 10216 mUnscaledDrawingCache = bitmap; 10217 } 10218 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 10219 } catch (OutOfMemoryError e) { 10220 // If there is not enough memory to create the bitmap cache, just 10221 // ignore the issue as bitmap caches are not required to draw the 10222 // view hierarchy 10223 if (autoScale) { 10224 mDrawingCache = null; 10225 } else { 10226 mUnscaledDrawingCache = null; 10227 } 10228 mCachingFailed = true; 10229 return; 10230 } 10231 10232 clear = drawingCacheBackgroundColor != 0; 10233 } 10234 10235 Canvas canvas; 10236 if (attachInfo != null) { 10237 canvas = attachInfo.mCanvas; 10238 if (canvas == null) { 10239 canvas = new Canvas(); 10240 } 10241 canvas.setBitmap(bitmap); 10242 // Temporarily clobber the cached Canvas in case one of our children 10243 // is also using a drawing cache. Without this, the children would 10244 // steal the canvas by attaching their own bitmap to it and bad, bad 10245 // thing would happen (invisible views, corrupted drawings, etc.) 10246 attachInfo.mCanvas = null; 10247 } else { 10248 // This case should hopefully never or seldom happen 10249 canvas = new Canvas(bitmap); 10250 } 10251 10252 if (clear) { 10253 bitmap.eraseColor(drawingCacheBackgroundColor); 10254 } 10255 10256 computeScroll(); 10257 final int restoreCount = canvas.save(); 10258 10259 if (autoScale && scalingRequired) { 10260 final float scale = attachInfo.mApplicationScale; 10261 canvas.scale(scale, scale); 10262 } 10263 10264 canvas.translate(-mScrollX, -mScrollY); 10265 10266 mPrivateFlags |= DRAWN; 10267 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 10268 mLayerType != LAYER_TYPE_NONE) { 10269 mPrivateFlags |= DRAWING_CACHE_VALID; 10270 } 10271 10272 // Fast path for layouts with no backgrounds 10273 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10274 if (ViewDebug.TRACE_HIERARCHY) { 10275 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10276 } 10277 mPrivateFlags &= ~DIRTY_MASK; 10278 dispatchDraw(canvas); 10279 } else { 10280 draw(canvas); 10281 } 10282 10283 canvas.restoreToCount(restoreCount); 10284 canvas.setBitmap(null); 10285 10286 if (attachInfo != null) { 10287 // Restore the cached Canvas for our siblings 10288 attachInfo.mCanvas = canvas; 10289 } 10290 } 10291 } 10292 10293 /** 10294 * Create a snapshot of the view into a bitmap. We should probably make 10295 * some form of this public, but should think about the API. 10296 */ 10297 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 10298 int width = mRight - mLeft; 10299 int height = mBottom - mTop; 10300 10301 final AttachInfo attachInfo = mAttachInfo; 10302 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 10303 width = (int) ((width * scale) + 0.5f); 10304 height = (int) ((height * scale) + 0.5f); 10305 10306 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 10307 if (bitmap == null) { 10308 throw new OutOfMemoryError(); 10309 } 10310 10311 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 10312 10313 Canvas canvas; 10314 if (attachInfo != null) { 10315 canvas = attachInfo.mCanvas; 10316 if (canvas == null) { 10317 canvas = new Canvas(); 10318 } 10319 canvas.setBitmap(bitmap); 10320 // Temporarily clobber the cached Canvas in case one of our children 10321 // is also using a drawing cache. Without this, the children would 10322 // steal the canvas by attaching their own bitmap to it and bad, bad 10323 // things would happen (invisible views, corrupted drawings, etc.) 10324 attachInfo.mCanvas = null; 10325 } else { 10326 // This case should hopefully never or seldom happen 10327 canvas = new Canvas(bitmap); 10328 } 10329 10330 if ((backgroundColor & 0xff000000) != 0) { 10331 bitmap.eraseColor(backgroundColor); 10332 } 10333 10334 computeScroll(); 10335 final int restoreCount = canvas.save(); 10336 canvas.scale(scale, scale); 10337 canvas.translate(-mScrollX, -mScrollY); 10338 10339 // Temporarily remove the dirty mask 10340 int flags = mPrivateFlags; 10341 mPrivateFlags &= ~DIRTY_MASK; 10342 10343 // Fast path for layouts with no backgrounds 10344 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 10345 dispatchDraw(canvas); 10346 } else { 10347 draw(canvas); 10348 } 10349 10350 mPrivateFlags = flags; 10351 10352 canvas.restoreToCount(restoreCount); 10353 canvas.setBitmap(null); 10354 10355 if (attachInfo != null) { 10356 // Restore the cached Canvas for our siblings 10357 attachInfo.mCanvas = canvas; 10358 } 10359 10360 return bitmap; 10361 } 10362 10363 /** 10364 * Indicates whether this View is currently in edit mode. A View is usually 10365 * in edit mode when displayed within a developer tool. For instance, if 10366 * this View is being drawn by a visual user interface builder, this method 10367 * should return true. 10368 * 10369 * Subclasses should check the return value of this method to provide 10370 * different behaviors if their normal behavior might interfere with the 10371 * host environment. For instance: the class spawns a thread in its 10372 * constructor, the drawing code relies on device-specific features, etc. 10373 * 10374 * This method is usually checked in the drawing code of custom widgets. 10375 * 10376 * @return True if this View is in edit mode, false otherwise. 10377 */ 10378 public boolean isInEditMode() { 10379 return false; 10380 } 10381 10382 /** 10383 * If the View draws content inside its padding and enables fading edges, 10384 * it needs to support padding offsets. Padding offsets are added to the 10385 * fading edges to extend the length of the fade so that it covers pixels 10386 * drawn inside the padding. 10387 * 10388 * Subclasses of this class should override this method if they need 10389 * to draw content inside the padding. 10390 * 10391 * @return True if padding offset must be applied, false otherwise. 10392 * 10393 * @see #getLeftPaddingOffset() 10394 * @see #getRightPaddingOffset() 10395 * @see #getTopPaddingOffset() 10396 * @see #getBottomPaddingOffset() 10397 * 10398 * @since CURRENT 10399 */ 10400 protected boolean isPaddingOffsetRequired() { 10401 return false; 10402 } 10403 10404 /** 10405 * Amount by which to extend the left fading region. Called only when 10406 * {@link #isPaddingOffsetRequired()} returns true. 10407 * 10408 * @return The left padding offset in pixels. 10409 * 10410 * @see #isPaddingOffsetRequired() 10411 * 10412 * @since CURRENT 10413 */ 10414 protected int getLeftPaddingOffset() { 10415 return 0; 10416 } 10417 10418 /** 10419 * Amount by which to extend the right fading region. Called only when 10420 * {@link #isPaddingOffsetRequired()} returns true. 10421 * 10422 * @return The right padding offset in pixels. 10423 * 10424 * @see #isPaddingOffsetRequired() 10425 * 10426 * @since CURRENT 10427 */ 10428 protected int getRightPaddingOffset() { 10429 return 0; 10430 } 10431 10432 /** 10433 * Amount by which to extend the top fading region. Called only when 10434 * {@link #isPaddingOffsetRequired()} returns true. 10435 * 10436 * @return The top padding offset in pixels. 10437 * 10438 * @see #isPaddingOffsetRequired() 10439 * 10440 * @since CURRENT 10441 */ 10442 protected int getTopPaddingOffset() { 10443 return 0; 10444 } 10445 10446 /** 10447 * Amount by which to extend the bottom fading region. Called only when 10448 * {@link #isPaddingOffsetRequired()} returns true. 10449 * 10450 * @return The bottom padding offset in pixels. 10451 * 10452 * @see #isPaddingOffsetRequired() 10453 * 10454 * @since CURRENT 10455 */ 10456 protected int getBottomPaddingOffset() { 10457 return 0; 10458 } 10459 10460 /** 10461 * @hide 10462 * @param offsetRequired 10463 */ 10464 protected int getFadeTop(boolean offsetRequired) { 10465 int top = mPaddingTop; 10466 if (offsetRequired) top += getTopPaddingOffset(); 10467 return top; 10468 } 10469 10470 /** 10471 * @hide 10472 * @param offsetRequired 10473 */ 10474 protected int getFadeHeight(boolean offsetRequired) { 10475 int padding = mPaddingTop; 10476 if (offsetRequired) padding += getTopPaddingOffset(); 10477 return mBottom - mTop - mPaddingBottom - padding; 10478 } 10479 10480 /** 10481 * <p>Indicates whether this view is attached to an hardware accelerated 10482 * window or not.</p> 10483 * 10484 * <p>Even if this method returns true, it does not mean that every call 10485 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 10486 * accelerated {@link android.graphics.Canvas}. For instance, if this view 10487 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 10488 * window is hardware accelerated, 10489 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 10490 * return false, and this method will return true.</p> 10491 * 10492 * @return True if the view is attached to a window and the window is 10493 * hardware accelerated; false in any other case. 10494 */ 10495 public boolean isHardwareAccelerated() { 10496 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 10497 } 10498 10499 /** 10500 * Manually render this view (and all of its children) to the given Canvas. 10501 * The view must have already done a full layout before this function is 10502 * called. When implementing a view, implement 10503 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 10504 * If you do need to override this method, call the superclass version. 10505 * 10506 * @param canvas The Canvas to which the View is rendered. 10507 */ 10508 public void draw(Canvas canvas) { 10509 if (ViewDebug.TRACE_HIERARCHY) { 10510 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 10511 } 10512 10513 final int privateFlags = mPrivateFlags; 10514 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 10515 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 10516 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 10517 10518 /* 10519 * Draw traversal performs several drawing steps which must be executed 10520 * in the appropriate order: 10521 * 10522 * 1. Draw the background 10523 * 2. If necessary, save the canvas' layers to prepare for fading 10524 * 3. Draw view's content 10525 * 4. Draw children 10526 * 5. If necessary, draw the fading edges and restore layers 10527 * 6. Draw decorations (scrollbars for instance) 10528 */ 10529 10530 // Step 1, draw the background, if needed 10531 int saveCount; 10532 10533 if (!dirtyOpaque) { 10534 final Drawable background = mBGDrawable; 10535 if (background != null) { 10536 final int scrollX = mScrollX; 10537 final int scrollY = mScrollY; 10538 10539 if (mBackgroundSizeChanged) { 10540 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 10541 mBackgroundSizeChanged = false; 10542 } 10543 10544 if ((scrollX | scrollY) == 0) { 10545 background.draw(canvas); 10546 } else { 10547 canvas.translate(scrollX, scrollY); 10548 background.draw(canvas); 10549 canvas.translate(-scrollX, -scrollY); 10550 } 10551 } 10552 } 10553 10554 // skip step 2 & 5 if possible (common case) 10555 final int viewFlags = mViewFlags; 10556 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 10557 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 10558 if (!verticalEdges && !horizontalEdges) { 10559 // Step 3, draw the content 10560 if (!dirtyOpaque) onDraw(canvas); 10561 10562 // Step 4, draw the children 10563 dispatchDraw(canvas); 10564 10565 // Step 6, draw decorations (scrollbars) 10566 onDrawScrollBars(canvas); 10567 10568 // we're done... 10569 return; 10570 } 10571 10572 /* 10573 * Here we do the full fledged routine... 10574 * (this is an uncommon case where speed matters less, 10575 * this is why we repeat some of the tests that have been 10576 * done above) 10577 */ 10578 10579 boolean drawTop = false; 10580 boolean drawBottom = false; 10581 boolean drawLeft = false; 10582 boolean drawRight = false; 10583 10584 float topFadeStrength = 0.0f; 10585 float bottomFadeStrength = 0.0f; 10586 float leftFadeStrength = 0.0f; 10587 float rightFadeStrength = 0.0f; 10588 10589 // Step 2, save the canvas' layers 10590 int paddingLeft = mPaddingLeft; 10591 10592 final boolean offsetRequired = isPaddingOffsetRequired(); 10593 if (offsetRequired) { 10594 paddingLeft += getLeftPaddingOffset(); 10595 } 10596 10597 int left = mScrollX + paddingLeft; 10598 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 10599 int top = mScrollY + getFadeTop(offsetRequired); 10600 int bottom = top + getFadeHeight(offsetRequired); 10601 10602 if (offsetRequired) { 10603 right += getRightPaddingOffset(); 10604 bottom += getBottomPaddingOffset(); 10605 } 10606 10607 final ScrollabilityCache scrollabilityCache = mScrollCache; 10608 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 10609 int length = (int) fadeHeight; 10610 10611 // clip the fade length if top and bottom fades overlap 10612 // overlapping fades produce odd-looking artifacts 10613 if (verticalEdges && (top + length > bottom - length)) { 10614 length = (bottom - top) / 2; 10615 } 10616 10617 // also clip horizontal fades if necessary 10618 if (horizontalEdges && (left + length > right - length)) { 10619 length = (right - left) / 2; 10620 } 10621 10622 if (verticalEdges) { 10623 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 10624 drawTop = topFadeStrength * fadeHeight > 1.0f; 10625 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 10626 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 10627 } 10628 10629 if (horizontalEdges) { 10630 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 10631 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 10632 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 10633 drawRight = rightFadeStrength * fadeHeight > 1.0f; 10634 } 10635 10636 saveCount = canvas.getSaveCount(); 10637 10638 int solidColor = getSolidColor(); 10639 if (solidColor == 0) { 10640 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 10641 10642 if (drawTop) { 10643 canvas.saveLayer(left, top, right, top + length, null, flags); 10644 } 10645 10646 if (drawBottom) { 10647 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 10648 } 10649 10650 if (drawLeft) { 10651 canvas.saveLayer(left, top, left + length, bottom, null, flags); 10652 } 10653 10654 if (drawRight) { 10655 canvas.saveLayer(right - length, top, right, bottom, null, flags); 10656 } 10657 } else { 10658 scrollabilityCache.setFadeColor(solidColor); 10659 } 10660 10661 // Step 3, draw the content 10662 if (!dirtyOpaque) onDraw(canvas); 10663 10664 // Step 4, draw the children 10665 dispatchDraw(canvas); 10666 10667 // Step 5, draw the fade effect and restore layers 10668 final Paint p = scrollabilityCache.paint; 10669 final Matrix matrix = scrollabilityCache.matrix; 10670 final Shader fade = scrollabilityCache.shader; 10671 10672 if (drawTop) { 10673 matrix.setScale(1, fadeHeight * topFadeStrength); 10674 matrix.postTranslate(left, top); 10675 fade.setLocalMatrix(matrix); 10676 canvas.drawRect(left, top, right, top + length, p); 10677 } 10678 10679 if (drawBottom) { 10680 matrix.setScale(1, fadeHeight * bottomFadeStrength); 10681 matrix.postRotate(180); 10682 matrix.postTranslate(left, bottom); 10683 fade.setLocalMatrix(matrix); 10684 canvas.drawRect(left, bottom - length, right, bottom, p); 10685 } 10686 10687 if (drawLeft) { 10688 matrix.setScale(1, fadeHeight * leftFadeStrength); 10689 matrix.postRotate(-90); 10690 matrix.postTranslate(left, top); 10691 fade.setLocalMatrix(matrix); 10692 canvas.drawRect(left, top, left + length, bottom, p); 10693 } 10694 10695 if (drawRight) { 10696 matrix.setScale(1, fadeHeight * rightFadeStrength); 10697 matrix.postRotate(90); 10698 matrix.postTranslate(right, top); 10699 fade.setLocalMatrix(matrix); 10700 canvas.drawRect(right - length, top, right, bottom, p); 10701 } 10702 10703 canvas.restoreToCount(saveCount); 10704 10705 // Step 6, draw decorations (scrollbars) 10706 onDrawScrollBars(canvas); 10707 } 10708 10709 /** 10710 * Override this if your view is known to always be drawn on top of a solid color background, 10711 * and needs to draw fading edges. Returning a non-zero color enables the view system to 10712 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 10713 * should be set to 0xFF. 10714 * 10715 * @see #setVerticalFadingEdgeEnabled(boolean) 10716 * @see #setHorizontalFadingEdgeEnabled(boolean) 10717 * 10718 * @return The known solid color background for this view, or 0 if the color may vary 10719 */ 10720 @ViewDebug.ExportedProperty(category = "drawing") 10721 public int getSolidColor() { 10722 return 0; 10723 } 10724 10725 /** 10726 * Build a human readable string representation of the specified view flags. 10727 * 10728 * @param flags the view flags to convert to a string 10729 * @return a String representing the supplied flags 10730 */ 10731 private static String printFlags(int flags) { 10732 String output = ""; 10733 int numFlags = 0; 10734 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 10735 output += "TAKES_FOCUS"; 10736 numFlags++; 10737 } 10738 10739 switch (flags & VISIBILITY_MASK) { 10740 case INVISIBLE: 10741 if (numFlags > 0) { 10742 output += " "; 10743 } 10744 output += "INVISIBLE"; 10745 // USELESS HERE numFlags++; 10746 break; 10747 case GONE: 10748 if (numFlags > 0) { 10749 output += " "; 10750 } 10751 output += "GONE"; 10752 // USELESS HERE numFlags++; 10753 break; 10754 default: 10755 break; 10756 } 10757 return output; 10758 } 10759 10760 /** 10761 * Build a human readable string representation of the specified private 10762 * view flags. 10763 * 10764 * @param privateFlags the private view flags to convert to a string 10765 * @return a String representing the supplied flags 10766 */ 10767 private static String printPrivateFlags(int privateFlags) { 10768 String output = ""; 10769 int numFlags = 0; 10770 10771 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 10772 output += "WANTS_FOCUS"; 10773 numFlags++; 10774 } 10775 10776 if ((privateFlags & FOCUSED) == FOCUSED) { 10777 if (numFlags > 0) { 10778 output += " "; 10779 } 10780 output += "FOCUSED"; 10781 numFlags++; 10782 } 10783 10784 if ((privateFlags & SELECTED) == SELECTED) { 10785 if (numFlags > 0) { 10786 output += " "; 10787 } 10788 output += "SELECTED"; 10789 numFlags++; 10790 } 10791 10792 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 10793 if (numFlags > 0) { 10794 output += " "; 10795 } 10796 output += "IS_ROOT_NAMESPACE"; 10797 numFlags++; 10798 } 10799 10800 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 10801 if (numFlags > 0) { 10802 output += " "; 10803 } 10804 output += "HAS_BOUNDS"; 10805 numFlags++; 10806 } 10807 10808 if ((privateFlags & DRAWN) == DRAWN) { 10809 if (numFlags > 0) { 10810 output += " "; 10811 } 10812 output += "DRAWN"; 10813 // USELESS HERE numFlags++; 10814 } 10815 return output; 10816 } 10817 10818 /** 10819 * <p>Indicates whether or not this view's layout will be requested during 10820 * the next hierarchy layout pass.</p> 10821 * 10822 * @return true if the layout will be forced during next layout pass 10823 */ 10824 public boolean isLayoutRequested() { 10825 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 10826 } 10827 10828 /** 10829 * Assign a size and position to a view and all of its 10830 * descendants 10831 * 10832 * <p>This is the second phase of the layout mechanism. 10833 * (The first is measuring). In this phase, each parent calls 10834 * layout on all of its children to position them. 10835 * This is typically done using the child measurements 10836 * that were stored in the measure pass().</p> 10837 * 10838 * <p>Derived classes should not override this method. 10839 * Derived classes with children should override 10840 * onLayout. In that method, they should 10841 * call layout on each of their children.</p> 10842 * 10843 * @param l Left position, relative to parent 10844 * @param t Top position, relative to parent 10845 * @param r Right position, relative to parent 10846 * @param b Bottom position, relative to parent 10847 */ 10848 @SuppressWarnings({"unchecked"}) 10849 public void layout(int l, int t, int r, int b) { 10850 int oldL = mLeft; 10851 int oldT = mTop; 10852 int oldB = mBottom; 10853 int oldR = mRight; 10854 boolean changed = setFrame(l, t, r, b); 10855 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 10856 if (ViewDebug.TRACE_HIERARCHY) { 10857 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 10858 } 10859 10860 onLayout(changed, l, t, r, b); 10861 mPrivateFlags &= ~LAYOUT_REQUIRED; 10862 10863 if (mOnLayoutChangeListeners != null) { 10864 ArrayList<OnLayoutChangeListener> listenersCopy = 10865 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 10866 int numListeners = listenersCopy.size(); 10867 for (int i = 0; i < numListeners; ++i) { 10868 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 10869 } 10870 } 10871 } 10872 mPrivateFlags &= ~FORCE_LAYOUT; 10873 } 10874 10875 /** 10876 * Called from layout when this view should 10877 * assign a size and position to each of its children. 10878 * 10879 * Derived classes with children should override 10880 * this method and call layout on each of 10881 * their children. 10882 * @param changed This is a new size or position for this view 10883 * @param left Left position, relative to parent 10884 * @param top Top position, relative to parent 10885 * @param right Right position, relative to parent 10886 * @param bottom Bottom position, relative to parent 10887 */ 10888 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 10889 } 10890 10891 /** 10892 * Assign a size and position to this view. 10893 * 10894 * This is called from layout. 10895 * 10896 * @param left Left position, relative to parent 10897 * @param top Top position, relative to parent 10898 * @param right Right position, relative to parent 10899 * @param bottom Bottom position, relative to parent 10900 * @return true if the new size and position are different than the 10901 * previous ones 10902 * {@hide} 10903 */ 10904 protected boolean setFrame(int left, int top, int right, int bottom) { 10905 boolean changed = false; 10906 10907 if (DBG) { 10908 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 10909 + right + "," + bottom + ")"); 10910 } 10911 10912 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 10913 changed = true; 10914 10915 // Remember our drawn bit 10916 int drawn = mPrivateFlags & DRAWN; 10917 10918 int oldWidth = mRight - mLeft; 10919 int oldHeight = mBottom - mTop; 10920 int newWidth = right - left; 10921 int newHeight = bottom - top; 10922 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 10923 10924 // Invalidate our old position 10925 invalidate(sizeChanged); 10926 10927 mLeft = left; 10928 mTop = top; 10929 mRight = right; 10930 mBottom = bottom; 10931 10932 mPrivateFlags |= HAS_BOUNDS; 10933 10934 10935 if (sizeChanged) { 10936 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 10937 // A change in dimension means an auto-centered pivot point changes, too 10938 mMatrixDirty = true; 10939 } 10940 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 10941 } 10942 10943 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 10944 // If we are visible, force the DRAWN bit to on so that 10945 // this invalidate will go through (at least to our parent). 10946 // This is because someone may have invalidated this view 10947 // before this call to setFrame came in, thereby clearing 10948 // the DRAWN bit. 10949 mPrivateFlags |= DRAWN; 10950 invalidate(sizeChanged); 10951 // parent display list may need to be recreated based on a change in the bounds 10952 // of any child 10953 invalidateParentCaches(); 10954 } 10955 10956 // Reset drawn bit to original value (invalidate turns it off) 10957 mPrivateFlags |= drawn; 10958 10959 mBackgroundSizeChanged = true; 10960 } 10961 return changed; 10962 } 10963 10964 /** 10965 * Finalize inflating a view from XML. This is called as the last phase 10966 * of inflation, after all child views have been added. 10967 * 10968 * <p>Even if the subclass overrides onFinishInflate, they should always be 10969 * sure to call the super method, so that we get called. 10970 */ 10971 protected void onFinishInflate() { 10972 } 10973 10974 /** 10975 * Returns the resources associated with this view. 10976 * 10977 * @return Resources object. 10978 */ 10979 public Resources getResources() { 10980 return mResources; 10981 } 10982 10983 /** 10984 * Invalidates the specified Drawable. 10985 * 10986 * @param drawable the drawable to invalidate 10987 */ 10988 public void invalidateDrawable(Drawable drawable) { 10989 if (verifyDrawable(drawable)) { 10990 final Rect dirty = drawable.getBounds(); 10991 final int scrollX = mScrollX; 10992 final int scrollY = mScrollY; 10993 10994 invalidate(dirty.left + scrollX, dirty.top + scrollY, 10995 dirty.right + scrollX, dirty.bottom + scrollY); 10996 } 10997 } 10998 10999 /** 11000 * Schedules an action on a drawable to occur at a specified time. 11001 * 11002 * @param who the recipient of the action 11003 * @param what the action to run on the drawable 11004 * @param when the time at which the action must occur. Uses the 11005 * {@link SystemClock#uptimeMillis} timebase. 11006 */ 11007 public void scheduleDrawable(Drawable who, Runnable what, long when) { 11008 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 11009 mAttachInfo.mHandler.postAtTime(what, who, when); 11010 } 11011 } 11012 11013 /** 11014 * Cancels a scheduled action on a drawable. 11015 * 11016 * @param who the recipient of the action 11017 * @param what the action to cancel 11018 */ 11019 public void unscheduleDrawable(Drawable who, Runnable what) { 11020 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 11021 mAttachInfo.mHandler.removeCallbacks(what, who); 11022 } 11023 } 11024 11025 /** 11026 * Unschedule any events associated with the given Drawable. This can be 11027 * used when selecting a new Drawable into a view, so that the previous 11028 * one is completely unscheduled. 11029 * 11030 * @param who The Drawable to unschedule. 11031 * 11032 * @see #drawableStateChanged 11033 */ 11034 public void unscheduleDrawable(Drawable who) { 11035 if (mAttachInfo != null) { 11036 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 11037 } 11038 } 11039 11040 /** 11041 * Return the layout direction of a given Drawable. 11042 * 11043 * @param who the Drawable to query 11044 * 11045 * @hide 11046 */ 11047 public int getResolvedLayoutDirection(Drawable who) { 11048 return (who == mBGDrawable) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 11049 } 11050 11051 /** 11052 * If your view subclass is displaying its own Drawable objects, it should 11053 * override this function and return true for any Drawable it is 11054 * displaying. This allows animations for those drawables to be 11055 * scheduled. 11056 * 11057 * <p>Be sure to call through to the super class when overriding this 11058 * function. 11059 * 11060 * @param who The Drawable to verify. Return true if it is one you are 11061 * displaying, else return the result of calling through to the 11062 * super class. 11063 * 11064 * @return boolean If true than the Drawable is being displayed in the 11065 * view; else false and it is not allowed to animate. 11066 * 11067 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 11068 * @see #drawableStateChanged() 11069 */ 11070 protected boolean verifyDrawable(Drawable who) { 11071 return who == mBGDrawable; 11072 } 11073 11074 /** 11075 * This function is called whenever the state of the view changes in such 11076 * a way that it impacts the state of drawables being shown. 11077 * 11078 * <p>Be sure to call through to the superclass when overriding this 11079 * function. 11080 * 11081 * @see Drawable#setState(int[]) 11082 */ 11083 protected void drawableStateChanged() { 11084 Drawable d = mBGDrawable; 11085 if (d != null && d.isStateful()) { 11086 d.setState(getDrawableState()); 11087 } 11088 } 11089 11090 /** 11091 * Call this to force a view to update its drawable state. This will cause 11092 * drawableStateChanged to be called on this view. Views that are interested 11093 * in the new state should call getDrawableState. 11094 * 11095 * @see #drawableStateChanged 11096 * @see #getDrawableState 11097 */ 11098 public void refreshDrawableState() { 11099 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11100 drawableStateChanged(); 11101 11102 ViewParent parent = mParent; 11103 if (parent != null) { 11104 parent.childDrawableStateChanged(this); 11105 } 11106 } 11107 11108 /** 11109 * Return an array of resource IDs of the drawable states representing the 11110 * current state of the view. 11111 * 11112 * @return The current drawable state 11113 * 11114 * @see Drawable#setState(int[]) 11115 * @see #drawableStateChanged() 11116 * @see #onCreateDrawableState(int) 11117 */ 11118 public final int[] getDrawableState() { 11119 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 11120 return mDrawableState; 11121 } else { 11122 mDrawableState = onCreateDrawableState(0); 11123 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 11124 return mDrawableState; 11125 } 11126 } 11127 11128 /** 11129 * Generate the new {@link android.graphics.drawable.Drawable} state for 11130 * this view. This is called by the view 11131 * system when the cached Drawable state is determined to be invalid. To 11132 * retrieve the current state, you should use {@link #getDrawableState}. 11133 * 11134 * @param extraSpace if non-zero, this is the number of extra entries you 11135 * would like in the returned array in which you can place your own 11136 * states. 11137 * 11138 * @return Returns an array holding the current {@link Drawable} state of 11139 * the view. 11140 * 11141 * @see #mergeDrawableStates(int[], int[]) 11142 */ 11143 protected int[] onCreateDrawableState(int extraSpace) { 11144 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 11145 mParent instanceof View) { 11146 return ((View) mParent).onCreateDrawableState(extraSpace); 11147 } 11148 11149 int[] drawableState; 11150 11151 int privateFlags = mPrivateFlags; 11152 11153 int viewStateIndex = 0; 11154 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 11155 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 11156 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 11157 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 11158 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 11159 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 11160 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 11161 HardwareRenderer.isAvailable()) { 11162 // This is set if HW acceleration is requested, even if the current 11163 // process doesn't allow it. This is just to allow app preview 11164 // windows to better match their app. 11165 viewStateIndex |= VIEW_STATE_ACCELERATED; 11166 } 11167 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 11168 11169 final int privateFlags2 = mPrivateFlags2; 11170 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 11171 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 11172 11173 drawableState = VIEW_STATE_SETS[viewStateIndex]; 11174 11175 //noinspection ConstantIfStatement 11176 if (false) { 11177 Log.i("View", "drawableStateIndex=" + viewStateIndex); 11178 Log.i("View", toString() 11179 + " pressed=" + ((privateFlags & PRESSED) != 0) 11180 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 11181 + " fo=" + hasFocus() 11182 + " sl=" + ((privateFlags & SELECTED) != 0) 11183 + " wf=" + hasWindowFocus() 11184 + ": " + Arrays.toString(drawableState)); 11185 } 11186 11187 if (extraSpace == 0) { 11188 return drawableState; 11189 } 11190 11191 final int[] fullState; 11192 if (drawableState != null) { 11193 fullState = new int[drawableState.length + extraSpace]; 11194 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 11195 } else { 11196 fullState = new int[extraSpace]; 11197 } 11198 11199 return fullState; 11200 } 11201 11202 /** 11203 * Merge your own state values in <var>additionalState</var> into the base 11204 * state values <var>baseState</var> that were returned by 11205 * {@link #onCreateDrawableState(int)}. 11206 * 11207 * @param baseState The base state values returned by 11208 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 11209 * own additional state values. 11210 * 11211 * @param additionalState The additional state values you would like 11212 * added to <var>baseState</var>; this array is not modified. 11213 * 11214 * @return As a convenience, the <var>baseState</var> array you originally 11215 * passed into the function is returned. 11216 * 11217 * @see #onCreateDrawableState(int) 11218 */ 11219 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 11220 final int N = baseState.length; 11221 int i = N - 1; 11222 while (i >= 0 && baseState[i] == 0) { 11223 i--; 11224 } 11225 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 11226 return baseState; 11227 } 11228 11229 /** 11230 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 11231 * on all Drawable objects associated with this view. 11232 */ 11233 public void jumpDrawablesToCurrentState() { 11234 if (mBGDrawable != null) { 11235 mBGDrawable.jumpToCurrentState(); 11236 } 11237 } 11238 11239 /** 11240 * Sets the background color for this view. 11241 * @param color the color of the background 11242 */ 11243 @RemotableViewMethod 11244 public void setBackgroundColor(int color) { 11245 if (mBGDrawable instanceof ColorDrawable) { 11246 ((ColorDrawable) mBGDrawable).setColor(color); 11247 } else { 11248 setBackgroundDrawable(new ColorDrawable(color)); 11249 } 11250 } 11251 11252 /** 11253 * Set the background to a given resource. The resource should refer to 11254 * a Drawable object or 0 to remove the background. 11255 * @param resid The identifier of the resource. 11256 * @attr ref android.R.styleable#View_background 11257 */ 11258 @RemotableViewMethod 11259 public void setBackgroundResource(int resid) { 11260 if (resid != 0 && resid == mBackgroundResource) { 11261 return; 11262 } 11263 11264 Drawable d= null; 11265 if (resid != 0) { 11266 d = mResources.getDrawable(resid); 11267 } 11268 setBackgroundDrawable(d); 11269 11270 mBackgroundResource = resid; 11271 } 11272 11273 /** 11274 * Set the background to a given Drawable, or remove the background. If the 11275 * background has padding, this View's padding is set to the background's 11276 * padding. However, when a background is removed, this View's padding isn't 11277 * touched. If setting the padding is desired, please use 11278 * {@link #setPadding(int, int, int, int)}. 11279 * 11280 * @param d The Drawable to use as the background, or null to remove the 11281 * background 11282 */ 11283 public void setBackgroundDrawable(Drawable d) { 11284 if (d == mBGDrawable) { 11285 return; 11286 } 11287 11288 boolean requestLayout = false; 11289 11290 mBackgroundResource = 0; 11291 11292 /* 11293 * Regardless of whether we're setting a new background or not, we want 11294 * to clear the previous drawable. 11295 */ 11296 if (mBGDrawable != null) { 11297 mBGDrawable.setCallback(null); 11298 unscheduleDrawable(mBGDrawable); 11299 } 11300 11301 if (d != null) { 11302 Rect padding = sThreadLocal.get(); 11303 if (padding == null) { 11304 padding = new Rect(); 11305 sThreadLocal.set(padding); 11306 } 11307 if (d.getPadding(padding)) { 11308 switch (d.getResolvedLayoutDirectionSelf()) { 11309 case LAYOUT_DIRECTION_RTL: 11310 setPadding(padding.right, padding.top, padding.left, padding.bottom); 11311 break; 11312 case LAYOUT_DIRECTION_LTR: 11313 default: 11314 setPadding(padding.left, padding.top, padding.right, padding.bottom); 11315 } 11316 } 11317 11318 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 11319 // if it has a different minimum size, we should layout again 11320 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 11321 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 11322 requestLayout = true; 11323 } 11324 11325 d.setCallback(this); 11326 if (d.isStateful()) { 11327 d.setState(getDrawableState()); 11328 } 11329 d.setVisible(getVisibility() == VISIBLE, false); 11330 mBGDrawable = d; 11331 11332 if ((mPrivateFlags & SKIP_DRAW) != 0) { 11333 mPrivateFlags &= ~SKIP_DRAW; 11334 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 11335 requestLayout = true; 11336 } 11337 } else { 11338 /* Remove the background */ 11339 mBGDrawable = null; 11340 11341 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 11342 /* 11343 * This view ONLY drew the background before and we're removing 11344 * the background, so now it won't draw anything 11345 * (hence we SKIP_DRAW) 11346 */ 11347 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 11348 mPrivateFlags |= SKIP_DRAW; 11349 } 11350 11351 /* 11352 * When the background is set, we try to apply its padding to this 11353 * View. When the background is removed, we don't touch this View's 11354 * padding. This is noted in the Javadocs. Hence, we don't need to 11355 * requestLayout(), the invalidate() below is sufficient. 11356 */ 11357 11358 // The old background's minimum size could have affected this 11359 // View's layout, so let's requestLayout 11360 requestLayout = true; 11361 } 11362 11363 computeOpaqueFlags(); 11364 11365 if (requestLayout) { 11366 requestLayout(); 11367 } 11368 11369 mBackgroundSizeChanged = true; 11370 invalidate(true); 11371 } 11372 11373 /** 11374 * Gets the background drawable 11375 * @return The drawable used as the background for this view, if any. 11376 */ 11377 public Drawable getBackground() { 11378 return mBGDrawable; 11379 } 11380 11381 /** 11382 * Sets the padding. The view may add on the space required to display 11383 * the scrollbars, depending on the style and visibility of the scrollbars. 11384 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 11385 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 11386 * from the values set in this call. 11387 * 11388 * @attr ref android.R.styleable#View_padding 11389 * @attr ref android.R.styleable#View_paddingBottom 11390 * @attr ref android.R.styleable#View_paddingLeft 11391 * @attr ref android.R.styleable#View_paddingRight 11392 * @attr ref android.R.styleable#View_paddingTop 11393 * @param left the left padding in pixels 11394 * @param top the top padding in pixels 11395 * @param right the right padding in pixels 11396 * @param bottom the bottom padding in pixels 11397 */ 11398 public void setPadding(int left, int top, int right, int bottom) { 11399 boolean changed = false; 11400 11401 mUserPaddingRelative = false; 11402 11403 mUserPaddingLeft = left; 11404 mUserPaddingRight = right; 11405 mUserPaddingBottom = bottom; 11406 11407 final int viewFlags = mViewFlags; 11408 11409 // Common case is there are no scroll bars. 11410 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 11411 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 11412 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 11413 ? 0 : getVerticalScrollbarWidth(); 11414 switch (mVerticalScrollbarPosition) { 11415 case SCROLLBAR_POSITION_DEFAULT: 11416 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 11417 left += offset; 11418 } else { 11419 right += offset; 11420 } 11421 break; 11422 case SCROLLBAR_POSITION_RIGHT: 11423 right += offset; 11424 break; 11425 case SCROLLBAR_POSITION_LEFT: 11426 left += offset; 11427 break; 11428 } 11429 } 11430 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 11431 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 11432 ? 0 : getHorizontalScrollbarHeight(); 11433 } 11434 } 11435 11436 if (mPaddingLeft != left) { 11437 changed = true; 11438 mPaddingLeft = left; 11439 } 11440 if (mPaddingTop != top) { 11441 changed = true; 11442 mPaddingTop = top; 11443 } 11444 if (mPaddingRight != right) { 11445 changed = true; 11446 mPaddingRight = right; 11447 } 11448 if (mPaddingBottom != bottom) { 11449 changed = true; 11450 mPaddingBottom = bottom; 11451 } 11452 11453 if (changed) { 11454 requestLayout(); 11455 } 11456 } 11457 11458 /** 11459 * Sets the relative padding. The view may add on the space required to display 11460 * the scrollbars, depending on the style and visibility of the scrollbars. 11461 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 11462 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 11463 * from the values set in this call. 11464 * 11465 * @attr ref android.R.styleable#View_padding 11466 * @attr ref android.R.styleable#View_paddingBottom 11467 * @attr ref android.R.styleable#View_paddingStart 11468 * @attr ref android.R.styleable#View_paddingEnd 11469 * @attr ref android.R.styleable#View_paddingTop 11470 * @param start the start padding in pixels 11471 * @param top the top padding in pixels 11472 * @param end the end padding in pixels 11473 * @param bottom the bottom padding in pixels 11474 * 11475 * @hide 11476 */ 11477 public void setPaddingRelative(int start, int top, int end, int bottom) { 11478 mUserPaddingRelative = true; 11479 11480 mUserPaddingStart = start; 11481 mUserPaddingEnd = end; 11482 11483 switch(getResolvedLayoutDirection()) { 11484 case LAYOUT_DIRECTION_RTL: 11485 setPadding(end, top, start, bottom); 11486 break; 11487 case LAYOUT_DIRECTION_LTR: 11488 default: 11489 setPadding(start, top, end, bottom); 11490 } 11491 } 11492 11493 /** 11494 * Returns the top padding of this view. 11495 * 11496 * @return the top padding in pixels 11497 */ 11498 public int getPaddingTop() { 11499 return mPaddingTop; 11500 } 11501 11502 /** 11503 * Returns the bottom padding of this view. If there are inset and enabled 11504 * scrollbars, this value may include the space required to display the 11505 * scrollbars as well. 11506 * 11507 * @return the bottom padding in pixels 11508 */ 11509 public int getPaddingBottom() { 11510 return mPaddingBottom; 11511 } 11512 11513 /** 11514 * Returns the left padding of this view. If there are inset and enabled 11515 * scrollbars, this value may include the space required to display the 11516 * scrollbars as well. 11517 * 11518 * @return the left padding in pixels 11519 */ 11520 public int getPaddingLeft() { 11521 return mPaddingLeft; 11522 } 11523 11524 /** 11525 * Returns the start padding of this view. If there are inset and enabled 11526 * scrollbars, this value may include the space required to display the 11527 * scrollbars as well. 11528 * 11529 * @return the start padding in pixels 11530 * 11531 * @hide 11532 */ 11533 public int getPaddingStart() { 11534 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11535 mPaddingRight : mPaddingLeft; 11536 } 11537 11538 /** 11539 * Returns the right padding of this view. If there are inset and enabled 11540 * scrollbars, this value may include the space required to display the 11541 * scrollbars as well. 11542 * 11543 * @return the right padding in pixels 11544 */ 11545 public int getPaddingRight() { 11546 return mPaddingRight; 11547 } 11548 11549 /** 11550 * Returns the end padding of this view. If there are inset and enabled 11551 * scrollbars, this value may include the space required to display the 11552 * scrollbars as well. 11553 * 11554 * @return the end padding in pixels 11555 * 11556 * @hide 11557 */ 11558 public int getPaddingEnd() { 11559 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 11560 mPaddingLeft : mPaddingRight; 11561 } 11562 11563 /** 11564 * Return if the padding as been set thru relative values 11565 * {@link #setPaddingRelative(int, int, int, int)} or thru 11566 * @attr ref android.R.styleable#View_paddingStart or 11567 * @attr ref android.R.styleable#View_paddingEnd 11568 * 11569 * @return true if the padding is relative or false if it is not. 11570 * 11571 * @hide 11572 */ 11573 public boolean isPaddingRelative() { 11574 return mUserPaddingRelative; 11575 } 11576 11577 /** 11578 * Changes the selection state of this view. A view can be selected or not. 11579 * Note that selection is not the same as focus. Views are typically 11580 * selected in the context of an AdapterView like ListView or GridView; 11581 * the selected view is the view that is highlighted. 11582 * 11583 * @param selected true if the view must be selected, false otherwise 11584 */ 11585 public void setSelected(boolean selected) { 11586 if (((mPrivateFlags & SELECTED) != 0) != selected) { 11587 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 11588 if (!selected) resetPressedState(); 11589 invalidate(true); 11590 refreshDrawableState(); 11591 dispatchSetSelected(selected); 11592 } 11593 } 11594 11595 /** 11596 * Dispatch setSelected to all of this View's children. 11597 * 11598 * @see #setSelected(boolean) 11599 * 11600 * @param selected The new selected state 11601 */ 11602 protected void dispatchSetSelected(boolean selected) { 11603 } 11604 11605 /** 11606 * Indicates the selection state of this view. 11607 * 11608 * @return true if the view is selected, false otherwise 11609 */ 11610 @ViewDebug.ExportedProperty 11611 public boolean isSelected() { 11612 return (mPrivateFlags & SELECTED) != 0; 11613 } 11614 11615 /** 11616 * Changes the activated state of this view. A view can be activated or not. 11617 * Note that activation is not the same as selection. Selection is 11618 * a transient property, representing the view (hierarchy) the user is 11619 * currently interacting with. Activation is a longer-term state that the 11620 * user can move views in and out of. For example, in a list view with 11621 * single or multiple selection enabled, the views in the current selection 11622 * set are activated. (Um, yeah, we are deeply sorry about the terminology 11623 * here.) The activated state is propagated down to children of the view it 11624 * is set on. 11625 * 11626 * @param activated true if the view must be activated, false otherwise 11627 */ 11628 public void setActivated(boolean activated) { 11629 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 11630 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 11631 invalidate(true); 11632 refreshDrawableState(); 11633 dispatchSetActivated(activated); 11634 } 11635 } 11636 11637 /** 11638 * Dispatch setActivated to all of this View's children. 11639 * 11640 * @see #setActivated(boolean) 11641 * 11642 * @param activated The new activated state 11643 */ 11644 protected void dispatchSetActivated(boolean activated) { 11645 } 11646 11647 /** 11648 * Indicates the activation state of this view. 11649 * 11650 * @return true if the view is activated, false otherwise 11651 */ 11652 @ViewDebug.ExportedProperty 11653 public boolean isActivated() { 11654 return (mPrivateFlags & ACTIVATED) != 0; 11655 } 11656 11657 /** 11658 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 11659 * observer can be used to get notifications when global events, like 11660 * layout, happen. 11661 * 11662 * The returned ViewTreeObserver observer is not guaranteed to remain 11663 * valid for the lifetime of this View. If the caller of this method keeps 11664 * a long-lived reference to ViewTreeObserver, it should always check for 11665 * the return value of {@link ViewTreeObserver#isAlive()}. 11666 * 11667 * @return The ViewTreeObserver for this view's hierarchy. 11668 */ 11669 public ViewTreeObserver getViewTreeObserver() { 11670 if (mAttachInfo != null) { 11671 return mAttachInfo.mTreeObserver; 11672 } 11673 if (mFloatingTreeObserver == null) { 11674 mFloatingTreeObserver = new ViewTreeObserver(); 11675 } 11676 return mFloatingTreeObserver; 11677 } 11678 11679 /** 11680 * <p>Finds the topmost view in the current view hierarchy.</p> 11681 * 11682 * @return the topmost view containing this view 11683 */ 11684 public View getRootView() { 11685 if (mAttachInfo != null) { 11686 final View v = mAttachInfo.mRootView; 11687 if (v != null) { 11688 return v; 11689 } 11690 } 11691 11692 View parent = this; 11693 11694 while (parent.mParent != null && parent.mParent instanceof View) { 11695 parent = (View) parent.mParent; 11696 } 11697 11698 return parent; 11699 } 11700 11701 /** 11702 * <p>Computes the coordinates of this view on the screen. The argument 11703 * must be an array of two integers. After the method returns, the array 11704 * contains the x and y location in that order.</p> 11705 * 11706 * @param location an array of two integers in which to hold the coordinates 11707 */ 11708 public void getLocationOnScreen(int[] location) { 11709 getLocationInWindow(location); 11710 11711 final AttachInfo info = mAttachInfo; 11712 if (info != null) { 11713 location[0] += info.mWindowLeft; 11714 location[1] += info.mWindowTop; 11715 } 11716 } 11717 11718 /** 11719 * <p>Computes the coordinates of this view in its window. The argument 11720 * must be an array of two integers. After the method returns, the array 11721 * contains the x and y location in that order.</p> 11722 * 11723 * @param location an array of two integers in which to hold the coordinates 11724 */ 11725 public void getLocationInWindow(int[] location) { 11726 if (location == null || location.length < 2) { 11727 throw new IllegalArgumentException("location must be an array of " 11728 + "two integers"); 11729 } 11730 11731 location[0] = mLeft + (int) (mTranslationX + 0.5f); 11732 location[1] = mTop + (int) (mTranslationY + 0.5f); 11733 11734 ViewParent viewParent = mParent; 11735 while (viewParent instanceof View) { 11736 final View view = (View)viewParent; 11737 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 11738 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 11739 viewParent = view.mParent; 11740 } 11741 11742 if (viewParent instanceof ViewRootImpl) { 11743 // *cough* 11744 final ViewRootImpl vr = (ViewRootImpl)viewParent; 11745 location[1] -= vr.mCurScrollY; 11746 } 11747 } 11748 11749 /** 11750 * {@hide} 11751 * @param id the id of the view to be found 11752 * @return the view of the specified id, null if cannot be found 11753 */ 11754 protected View findViewTraversal(int id) { 11755 if (id == mID) { 11756 return this; 11757 } 11758 return null; 11759 } 11760 11761 /** 11762 * {@hide} 11763 * @param tag the tag of the view to be found 11764 * @return the view of specified tag, null if cannot be found 11765 */ 11766 protected View findViewWithTagTraversal(Object tag) { 11767 if (tag != null && tag.equals(mTag)) { 11768 return this; 11769 } 11770 return null; 11771 } 11772 11773 /** 11774 * {@hide} 11775 * @param predicate The predicate to evaluate. 11776 * @param childToSkip If not null, ignores this child during the recursive traversal. 11777 * @return The first view that matches the predicate or null. 11778 */ 11779 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 11780 if (predicate.apply(this)) { 11781 return this; 11782 } 11783 return null; 11784 } 11785 11786 /** 11787 * Look for a child view with the given id. If this view has the given 11788 * id, return this view. 11789 * 11790 * @param id The id to search for. 11791 * @return The view that has the given id in the hierarchy or null 11792 */ 11793 public final View findViewById(int id) { 11794 if (id < 0) { 11795 return null; 11796 } 11797 return findViewTraversal(id); 11798 } 11799 11800 /** 11801 * Look for a child view with the given tag. If this view has the given 11802 * tag, return this view. 11803 * 11804 * @param tag The tag to search for, using "tag.equals(getTag())". 11805 * @return The View that has the given tag in the hierarchy or null 11806 */ 11807 public final View findViewWithTag(Object tag) { 11808 if (tag == null) { 11809 return null; 11810 } 11811 return findViewWithTagTraversal(tag); 11812 } 11813 11814 /** 11815 * {@hide} 11816 * Look for a child view that matches the specified predicate. 11817 * If this view matches the predicate, return this view. 11818 * 11819 * @param predicate The predicate to evaluate. 11820 * @return The first view that matches the predicate or null. 11821 */ 11822 public final View findViewByPredicate(Predicate<View> predicate) { 11823 return findViewByPredicateTraversal(predicate, null); 11824 } 11825 11826 /** 11827 * {@hide} 11828 * Look for a child view that matches the specified predicate, 11829 * starting with the specified view and its descendents and then 11830 * recusively searching the ancestors and siblings of that view 11831 * until this view is reached. 11832 * 11833 * This method is useful in cases where the predicate does not match 11834 * a single unique view (perhaps multiple views use the same id) 11835 * and we are trying to find the view that is "closest" in scope to the 11836 * starting view. 11837 * 11838 * @param start The view to start from. 11839 * @param predicate The predicate to evaluate. 11840 * @return The first view that matches the predicate or null. 11841 */ 11842 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 11843 View childToSkip = null; 11844 for (;;) { 11845 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 11846 if (view != null || start == this) { 11847 return view; 11848 } 11849 11850 ViewParent parent = start.getParent(); 11851 if (parent == null || !(parent instanceof View)) { 11852 return null; 11853 } 11854 11855 childToSkip = start; 11856 start = (View) parent; 11857 } 11858 } 11859 11860 /** 11861 * Sets the identifier for this view. The identifier does not have to be 11862 * unique in this view's hierarchy. The identifier should be a positive 11863 * number. 11864 * 11865 * @see #NO_ID 11866 * @see #getId() 11867 * @see #findViewById(int) 11868 * 11869 * @param id a number used to identify the view 11870 * 11871 * @attr ref android.R.styleable#View_id 11872 */ 11873 public void setId(int id) { 11874 mID = id; 11875 } 11876 11877 /** 11878 * {@hide} 11879 * 11880 * @param isRoot true if the view belongs to the root namespace, false 11881 * otherwise 11882 */ 11883 public void setIsRootNamespace(boolean isRoot) { 11884 if (isRoot) { 11885 mPrivateFlags |= IS_ROOT_NAMESPACE; 11886 } else { 11887 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 11888 } 11889 } 11890 11891 /** 11892 * {@hide} 11893 * 11894 * @return true if the view belongs to the root namespace, false otherwise 11895 */ 11896 public boolean isRootNamespace() { 11897 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 11898 } 11899 11900 /** 11901 * Returns this view's identifier. 11902 * 11903 * @return a positive integer used to identify the view or {@link #NO_ID} 11904 * if the view has no ID 11905 * 11906 * @see #setId(int) 11907 * @see #findViewById(int) 11908 * @attr ref android.R.styleable#View_id 11909 */ 11910 @ViewDebug.CapturedViewProperty 11911 public int getId() { 11912 return mID; 11913 } 11914 11915 /** 11916 * Returns this view's tag. 11917 * 11918 * @return the Object stored in this view as a tag 11919 * 11920 * @see #setTag(Object) 11921 * @see #getTag(int) 11922 */ 11923 @ViewDebug.ExportedProperty 11924 public Object getTag() { 11925 return mTag; 11926 } 11927 11928 /** 11929 * Sets the tag associated with this view. A tag can be used to mark 11930 * a view in its hierarchy and does not have to be unique within the 11931 * hierarchy. Tags can also be used to store data within a view without 11932 * resorting to another data structure. 11933 * 11934 * @param tag an Object to tag the view with 11935 * 11936 * @see #getTag() 11937 * @see #setTag(int, Object) 11938 */ 11939 public void setTag(final Object tag) { 11940 mTag = tag; 11941 } 11942 11943 /** 11944 * Returns the tag associated with this view and the specified key. 11945 * 11946 * @param key The key identifying the tag 11947 * 11948 * @return the Object stored in this view as a tag 11949 * 11950 * @see #setTag(int, Object) 11951 * @see #getTag() 11952 */ 11953 public Object getTag(int key) { 11954 SparseArray<Object> tags = null; 11955 synchronized (sTagsLock) { 11956 if (sTags != null) { 11957 tags = sTags.get(this); 11958 } 11959 } 11960 11961 if (tags != null) return tags.get(key); 11962 return null; 11963 } 11964 11965 /** 11966 * Sets a tag associated with this view and a key. A tag can be used 11967 * to mark a view in its hierarchy and does not have to be unique within 11968 * the hierarchy. Tags can also be used to store data within a view 11969 * without resorting to another data structure. 11970 * 11971 * The specified key should be an id declared in the resources of the 11972 * application to ensure it is unique (see the <a 11973 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 11974 * Keys identified as belonging to 11975 * the Android framework or not associated with any package will cause 11976 * an {@link IllegalArgumentException} to be thrown. 11977 * 11978 * @param key The key identifying the tag 11979 * @param tag An Object to tag the view with 11980 * 11981 * @throws IllegalArgumentException If they specified key is not valid 11982 * 11983 * @see #setTag(Object) 11984 * @see #getTag(int) 11985 */ 11986 public void setTag(int key, final Object tag) { 11987 // If the package id is 0x00 or 0x01, it's either an undefined package 11988 // or a framework id 11989 if ((key >>> 24) < 2) { 11990 throw new IllegalArgumentException("The key must be an application-specific " 11991 + "resource id."); 11992 } 11993 11994 setTagInternal(this, key, tag); 11995 } 11996 11997 /** 11998 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 11999 * framework id. 12000 * 12001 * @hide 12002 */ 12003 public void setTagInternal(int key, Object tag) { 12004 if ((key >>> 24) != 0x1) { 12005 throw new IllegalArgumentException("The key must be a framework-specific " 12006 + "resource id."); 12007 } 12008 12009 setTagInternal(this, key, tag); 12010 } 12011 12012 private static void setTagInternal(View view, int key, Object tag) { 12013 SparseArray<Object> tags = null; 12014 synchronized (sTagsLock) { 12015 if (sTags == null) { 12016 sTags = new WeakHashMap<View, SparseArray<Object>>(); 12017 } else { 12018 tags = sTags.get(view); 12019 } 12020 } 12021 12022 if (tags == null) { 12023 tags = new SparseArray<Object>(2); 12024 synchronized (sTagsLock) { 12025 sTags.put(view, tags); 12026 } 12027 } 12028 12029 tags.put(key, tag); 12030 } 12031 12032 /** 12033 * @param consistency The type of consistency. See ViewDebug for more information. 12034 * 12035 * @hide 12036 */ 12037 protected boolean dispatchConsistencyCheck(int consistency) { 12038 return onConsistencyCheck(consistency); 12039 } 12040 12041 /** 12042 * Method that subclasses should implement to check their consistency. The type of 12043 * consistency check is indicated by the bit field passed as a parameter. 12044 * 12045 * @param consistency The type of consistency. See ViewDebug for more information. 12046 * 12047 * @throws IllegalStateException if the view is in an inconsistent state. 12048 * 12049 * @hide 12050 */ 12051 protected boolean onConsistencyCheck(int consistency) { 12052 boolean result = true; 12053 12054 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 12055 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 12056 12057 if (checkLayout) { 12058 if (getParent() == null) { 12059 result = false; 12060 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12061 "View " + this + " does not have a parent."); 12062 } 12063 12064 if (mAttachInfo == null) { 12065 result = false; 12066 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12067 "View " + this + " is not attached to a window."); 12068 } 12069 } 12070 12071 if (checkDrawing) { 12072 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 12073 // from their draw() method 12074 12075 if ((mPrivateFlags & DRAWN) != DRAWN && 12076 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 12077 result = false; 12078 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 12079 "View " + this + " was invalidated but its drawing cache is valid."); 12080 } 12081 } 12082 12083 return result; 12084 } 12085 12086 /** 12087 * Prints information about this view in the log output, with the tag 12088 * {@link #VIEW_LOG_TAG}. 12089 * 12090 * @hide 12091 */ 12092 public void debug() { 12093 debug(0); 12094 } 12095 12096 /** 12097 * Prints information about this view in the log output, with the tag 12098 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 12099 * indentation defined by the <code>depth</code>. 12100 * 12101 * @param depth the indentation level 12102 * 12103 * @hide 12104 */ 12105 protected void debug(int depth) { 12106 String output = debugIndent(depth - 1); 12107 12108 output += "+ " + this; 12109 int id = getId(); 12110 if (id != -1) { 12111 output += " (id=" + id + ")"; 12112 } 12113 Object tag = getTag(); 12114 if (tag != null) { 12115 output += " (tag=" + tag + ")"; 12116 } 12117 Log.d(VIEW_LOG_TAG, output); 12118 12119 if ((mPrivateFlags & FOCUSED) != 0) { 12120 output = debugIndent(depth) + " FOCUSED"; 12121 Log.d(VIEW_LOG_TAG, output); 12122 } 12123 12124 output = debugIndent(depth); 12125 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 12126 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 12127 + "} "; 12128 Log.d(VIEW_LOG_TAG, output); 12129 12130 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 12131 || mPaddingBottom != 0) { 12132 output = debugIndent(depth); 12133 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 12134 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 12135 Log.d(VIEW_LOG_TAG, output); 12136 } 12137 12138 output = debugIndent(depth); 12139 output += "mMeasureWidth=" + mMeasuredWidth + 12140 " mMeasureHeight=" + mMeasuredHeight; 12141 Log.d(VIEW_LOG_TAG, output); 12142 12143 output = debugIndent(depth); 12144 if (mLayoutParams == null) { 12145 output += "BAD! no layout params"; 12146 } else { 12147 output = mLayoutParams.debug(output); 12148 } 12149 Log.d(VIEW_LOG_TAG, output); 12150 12151 output = debugIndent(depth); 12152 output += "flags={"; 12153 output += View.printFlags(mViewFlags); 12154 output += "}"; 12155 Log.d(VIEW_LOG_TAG, output); 12156 12157 output = debugIndent(depth); 12158 output += "privateFlags={"; 12159 output += View.printPrivateFlags(mPrivateFlags); 12160 output += "}"; 12161 Log.d(VIEW_LOG_TAG, output); 12162 } 12163 12164 /** 12165 * Creates an string of whitespaces used for indentation. 12166 * 12167 * @param depth the indentation level 12168 * @return a String containing (depth * 2 + 3) * 2 white spaces 12169 * 12170 * @hide 12171 */ 12172 protected static String debugIndent(int depth) { 12173 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 12174 for (int i = 0; i < (depth * 2) + 3; i++) { 12175 spaces.append(' ').append(' '); 12176 } 12177 return spaces.toString(); 12178 } 12179 12180 /** 12181 * <p>Return the offset of the widget's text baseline from the widget's top 12182 * boundary. If this widget does not support baseline alignment, this 12183 * method returns -1. </p> 12184 * 12185 * @return the offset of the baseline within the widget's bounds or -1 12186 * if baseline alignment is not supported 12187 */ 12188 @ViewDebug.ExportedProperty(category = "layout") 12189 public int getBaseline() { 12190 return -1; 12191 } 12192 12193 /** 12194 * Call this when something has changed which has invalidated the 12195 * layout of this view. This will schedule a layout pass of the view 12196 * tree. 12197 */ 12198 public void requestLayout() { 12199 if (ViewDebug.TRACE_HIERARCHY) { 12200 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 12201 } 12202 12203 mPrivateFlags |= FORCE_LAYOUT; 12204 mPrivateFlags |= INVALIDATED; 12205 12206 if (mParent != null) { 12207 if (mLayoutParams != null) { 12208 mLayoutParams.resolveWithDirection(getResolvedLayoutDirection()); 12209 } 12210 if (!mParent.isLayoutRequested()) { 12211 mParent.requestLayout(); 12212 } 12213 } 12214 } 12215 12216 /** 12217 * Forces this view to be laid out during the next layout pass. 12218 * This method does not call requestLayout() or forceLayout() 12219 * on the parent. 12220 */ 12221 public void forceLayout() { 12222 mPrivateFlags |= FORCE_LAYOUT; 12223 mPrivateFlags |= INVALIDATED; 12224 } 12225 12226 /** 12227 * <p> 12228 * This is called to find out how big a view should be. The parent 12229 * supplies constraint information in the width and height parameters. 12230 * </p> 12231 * 12232 * <p> 12233 * The actual mesurement work of a view is performed in 12234 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 12235 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 12236 * </p> 12237 * 12238 * 12239 * @param widthMeasureSpec Horizontal space requirements as imposed by the 12240 * parent 12241 * @param heightMeasureSpec Vertical space requirements as imposed by the 12242 * parent 12243 * 12244 * @see #onMeasure(int, int) 12245 */ 12246 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 12247 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 12248 widthMeasureSpec != mOldWidthMeasureSpec || 12249 heightMeasureSpec != mOldHeightMeasureSpec) { 12250 12251 // first clears the measured dimension flag 12252 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 12253 12254 if (ViewDebug.TRACE_HIERARCHY) { 12255 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 12256 } 12257 12258 // measure ourselves, this should set the measured dimension flag back 12259 onMeasure(widthMeasureSpec, heightMeasureSpec); 12260 12261 // flag not set, setMeasuredDimension() was not invoked, we raise 12262 // an exception to warn the developer 12263 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 12264 throw new IllegalStateException("onMeasure() did not set the" 12265 + " measured dimension by calling" 12266 + " setMeasuredDimension()"); 12267 } 12268 12269 mPrivateFlags |= LAYOUT_REQUIRED; 12270 } 12271 12272 mOldWidthMeasureSpec = widthMeasureSpec; 12273 mOldHeightMeasureSpec = heightMeasureSpec; 12274 } 12275 12276 /** 12277 * <p> 12278 * Measure the view and its content to determine the measured width and the 12279 * measured height. This method is invoked by {@link #measure(int, int)} and 12280 * should be overriden by subclasses to provide accurate and efficient 12281 * measurement of their contents. 12282 * </p> 12283 * 12284 * <p> 12285 * <strong>CONTRACT:</strong> When overriding this method, you 12286 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 12287 * measured width and height of this view. Failure to do so will trigger an 12288 * <code>IllegalStateException</code>, thrown by 12289 * {@link #measure(int, int)}. Calling the superclass' 12290 * {@link #onMeasure(int, int)} is a valid use. 12291 * </p> 12292 * 12293 * <p> 12294 * The base class implementation of measure defaults to the background size, 12295 * unless a larger size is allowed by the MeasureSpec. Subclasses should 12296 * override {@link #onMeasure(int, int)} to provide better measurements of 12297 * their content. 12298 * </p> 12299 * 12300 * <p> 12301 * If this method is overridden, it is the subclass's responsibility to make 12302 * sure the measured height and width are at least the view's minimum height 12303 * and width ({@link #getSuggestedMinimumHeight()} and 12304 * {@link #getSuggestedMinimumWidth()}). 12305 * </p> 12306 * 12307 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 12308 * The requirements are encoded with 12309 * {@link android.view.View.MeasureSpec}. 12310 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 12311 * The requirements are encoded with 12312 * {@link android.view.View.MeasureSpec}. 12313 * 12314 * @see #getMeasuredWidth() 12315 * @see #getMeasuredHeight() 12316 * @see #setMeasuredDimension(int, int) 12317 * @see #getSuggestedMinimumHeight() 12318 * @see #getSuggestedMinimumWidth() 12319 * @see android.view.View.MeasureSpec#getMode(int) 12320 * @see android.view.View.MeasureSpec#getSize(int) 12321 */ 12322 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 12323 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 12324 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 12325 } 12326 12327 /** 12328 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 12329 * measured width and measured height. Failing to do so will trigger an 12330 * exception at measurement time.</p> 12331 * 12332 * @param measuredWidth The measured width of this view. May be a complex 12333 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12334 * {@link #MEASURED_STATE_TOO_SMALL}. 12335 * @param measuredHeight The measured height of this view. May be a complex 12336 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 12337 * {@link #MEASURED_STATE_TOO_SMALL}. 12338 */ 12339 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 12340 mMeasuredWidth = measuredWidth; 12341 mMeasuredHeight = measuredHeight; 12342 12343 mPrivateFlags |= MEASURED_DIMENSION_SET; 12344 } 12345 12346 /** 12347 * Merge two states as returned by {@link #getMeasuredState()}. 12348 * @param curState The current state as returned from a view or the result 12349 * of combining multiple views. 12350 * @param newState The new view state to combine. 12351 * @return Returns a new integer reflecting the combination of the two 12352 * states. 12353 */ 12354 public static int combineMeasuredStates(int curState, int newState) { 12355 return curState | newState; 12356 } 12357 12358 /** 12359 * Version of {@link #resolveSizeAndState(int, int, int)} 12360 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 12361 */ 12362 public static int resolveSize(int size, int measureSpec) { 12363 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 12364 } 12365 12366 /** 12367 * Utility to reconcile a desired size and state, with constraints imposed 12368 * by a MeasureSpec. Will take the desired size, unless a different size 12369 * is imposed by the constraints. The returned value is a compound integer, 12370 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 12371 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 12372 * size is smaller than the size the view wants to be. 12373 * 12374 * @param size How big the view wants to be 12375 * @param measureSpec Constraints imposed by the parent 12376 * @return Size information bit mask as defined by 12377 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 12378 */ 12379 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 12380 int result = size; 12381 int specMode = MeasureSpec.getMode(measureSpec); 12382 int specSize = MeasureSpec.getSize(measureSpec); 12383 switch (specMode) { 12384 case MeasureSpec.UNSPECIFIED: 12385 result = size; 12386 break; 12387 case MeasureSpec.AT_MOST: 12388 if (specSize < size) { 12389 result = specSize | MEASURED_STATE_TOO_SMALL; 12390 } else { 12391 result = size; 12392 } 12393 break; 12394 case MeasureSpec.EXACTLY: 12395 result = specSize; 12396 break; 12397 } 12398 return result | (childMeasuredState&MEASURED_STATE_MASK); 12399 } 12400 12401 /** 12402 * Utility to return a default size. Uses the supplied size if the 12403 * MeasureSpec imposed no constraints. Will get larger if allowed 12404 * by the MeasureSpec. 12405 * 12406 * @param size Default size for this view 12407 * @param measureSpec Constraints imposed by the parent 12408 * @return The size this view should be. 12409 */ 12410 public static int getDefaultSize(int size, int measureSpec) { 12411 int result = size; 12412 int specMode = MeasureSpec.getMode(measureSpec); 12413 int specSize = MeasureSpec.getSize(measureSpec); 12414 12415 switch (specMode) { 12416 case MeasureSpec.UNSPECIFIED: 12417 result = size; 12418 break; 12419 case MeasureSpec.AT_MOST: 12420 case MeasureSpec.EXACTLY: 12421 result = specSize; 12422 break; 12423 } 12424 return result; 12425 } 12426 12427 /** 12428 * Returns the suggested minimum height that the view should use. This 12429 * returns the maximum of the view's minimum height 12430 * and the background's minimum height 12431 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 12432 * <p> 12433 * When being used in {@link #onMeasure(int, int)}, the caller should still 12434 * ensure the returned height is within the requirements of the parent. 12435 * 12436 * @return The suggested minimum height of the view. 12437 */ 12438 protected int getSuggestedMinimumHeight() { 12439 int suggestedMinHeight = mMinHeight; 12440 12441 if (mBGDrawable != null) { 12442 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 12443 if (suggestedMinHeight < bgMinHeight) { 12444 suggestedMinHeight = bgMinHeight; 12445 } 12446 } 12447 12448 return suggestedMinHeight; 12449 } 12450 12451 /** 12452 * Returns the suggested minimum width that the view should use. This 12453 * returns the maximum of the view's minimum width) 12454 * and the background's minimum width 12455 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 12456 * <p> 12457 * When being used in {@link #onMeasure(int, int)}, the caller should still 12458 * ensure the returned width is within the requirements of the parent. 12459 * 12460 * @return The suggested minimum width of the view. 12461 */ 12462 protected int getSuggestedMinimumWidth() { 12463 int suggestedMinWidth = mMinWidth; 12464 12465 if (mBGDrawable != null) { 12466 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 12467 if (suggestedMinWidth < bgMinWidth) { 12468 suggestedMinWidth = bgMinWidth; 12469 } 12470 } 12471 12472 return suggestedMinWidth; 12473 } 12474 12475 /** 12476 * Sets the minimum height of the view. It is not guaranteed the view will 12477 * be able to achieve this minimum height (for example, if its parent layout 12478 * constrains it with less available height). 12479 * 12480 * @param minHeight The minimum height the view will try to be. 12481 */ 12482 public void setMinimumHeight(int minHeight) { 12483 mMinHeight = minHeight; 12484 } 12485 12486 /** 12487 * Sets the minimum width of the view. It is not guaranteed the view will 12488 * be able to achieve this minimum width (for example, if its parent layout 12489 * constrains it with less available width). 12490 * 12491 * @param minWidth The minimum width the view will try to be. 12492 */ 12493 public void setMinimumWidth(int minWidth) { 12494 mMinWidth = minWidth; 12495 } 12496 12497 /** 12498 * Get the animation currently associated with this view. 12499 * 12500 * @return The animation that is currently playing or 12501 * scheduled to play for this view. 12502 */ 12503 public Animation getAnimation() { 12504 return mCurrentAnimation; 12505 } 12506 12507 /** 12508 * Start the specified animation now. 12509 * 12510 * @param animation the animation to start now 12511 */ 12512 public void startAnimation(Animation animation) { 12513 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 12514 setAnimation(animation); 12515 invalidateParentCaches(); 12516 invalidate(true); 12517 } 12518 12519 /** 12520 * Cancels any animations for this view. 12521 */ 12522 public void clearAnimation() { 12523 if (mCurrentAnimation != null) { 12524 mCurrentAnimation.detach(); 12525 } 12526 mCurrentAnimation = null; 12527 invalidateParentIfNeeded(); 12528 } 12529 12530 /** 12531 * Sets the next animation to play for this view. 12532 * If you want the animation to play immediately, use 12533 * startAnimation. This method provides allows fine-grained 12534 * control over the start time and invalidation, but you 12535 * must make sure that 1) the animation has a start time set, and 12536 * 2) the view will be invalidated when the animation is supposed to 12537 * start. 12538 * 12539 * @param animation The next animation, or null. 12540 */ 12541 public void setAnimation(Animation animation) { 12542 mCurrentAnimation = animation; 12543 if (animation != null) { 12544 animation.reset(); 12545 } 12546 } 12547 12548 /** 12549 * Invoked by a parent ViewGroup to notify the start of the animation 12550 * currently associated with this view. If you override this method, 12551 * always call super.onAnimationStart(); 12552 * 12553 * @see #setAnimation(android.view.animation.Animation) 12554 * @see #getAnimation() 12555 */ 12556 protected void onAnimationStart() { 12557 mPrivateFlags |= ANIMATION_STARTED; 12558 } 12559 12560 /** 12561 * Invoked by a parent ViewGroup to notify the end of the animation 12562 * currently associated with this view. If you override this method, 12563 * always call super.onAnimationEnd(); 12564 * 12565 * @see #setAnimation(android.view.animation.Animation) 12566 * @see #getAnimation() 12567 */ 12568 protected void onAnimationEnd() { 12569 mPrivateFlags &= ~ANIMATION_STARTED; 12570 } 12571 12572 /** 12573 * Invoked if there is a Transform that involves alpha. Subclass that can 12574 * draw themselves with the specified alpha should return true, and then 12575 * respect that alpha when their onDraw() is called. If this returns false 12576 * then the view may be redirected to draw into an offscreen buffer to 12577 * fulfill the request, which will look fine, but may be slower than if the 12578 * subclass handles it internally. The default implementation returns false. 12579 * 12580 * @param alpha The alpha (0..255) to apply to the view's drawing 12581 * @return true if the view can draw with the specified alpha. 12582 */ 12583 protected boolean onSetAlpha(int alpha) { 12584 return false; 12585 } 12586 12587 /** 12588 * This is used by the RootView to perform an optimization when 12589 * the view hierarchy contains one or several SurfaceView. 12590 * SurfaceView is always considered transparent, but its children are not, 12591 * therefore all View objects remove themselves from the global transparent 12592 * region (passed as a parameter to this function). 12593 * 12594 * @param region The transparent region for this ViewAncestor (window). 12595 * 12596 * @return Returns true if the effective visibility of the view at this 12597 * point is opaque, regardless of the transparent region; returns false 12598 * if it is possible for underlying windows to be seen behind the view. 12599 * 12600 * {@hide} 12601 */ 12602 public boolean gatherTransparentRegion(Region region) { 12603 final AttachInfo attachInfo = mAttachInfo; 12604 if (region != null && attachInfo != null) { 12605 final int pflags = mPrivateFlags; 12606 if ((pflags & SKIP_DRAW) == 0) { 12607 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 12608 // remove it from the transparent region. 12609 final int[] location = attachInfo.mTransparentLocation; 12610 getLocationInWindow(location); 12611 region.op(location[0], location[1], location[0] + mRight - mLeft, 12612 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 12613 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 12614 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 12615 // exists, so we remove the background drawable's non-transparent 12616 // parts from this transparent region. 12617 applyDrawableToTransparentRegion(mBGDrawable, region); 12618 } 12619 } 12620 return true; 12621 } 12622 12623 /** 12624 * Play a sound effect for this view. 12625 * 12626 * <p>The framework will play sound effects for some built in actions, such as 12627 * clicking, but you may wish to play these effects in your widget, 12628 * for instance, for internal navigation. 12629 * 12630 * <p>The sound effect will only be played if sound effects are enabled by the user, and 12631 * {@link #isSoundEffectsEnabled()} is true. 12632 * 12633 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 12634 */ 12635 public void playSoundEffect(int soundConstant) { 12636 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 12637 return; 12638 } 12639 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 12640 } 12641 12642 /** 12643 * BZZZTT!!1! 12644 * 12645 * <p>Provide haptic feedback to the user for this view. 12646 * 12647 * <p>The framework will provide haptic feedback for some built in actions, 12648 * such as long presses, but you may wish to provide feedback for your 12649 * own widget. 12650 * 12651 * <p>The feedback will only be performed if 12652 * {@link #isHapticFeedbackEnabled()} is true. 12653 * 12654 * @param feedbackConstant One of the constants defined in 12655 * {@link HapticFeedbackConstants} 12656 */ 12657 public boolean performHapticFeedback(int feedbackConstant) { 12658 return performHapticFeedback(feedbackConstant, 0); 12659 } 12660 12661 /** 12662 * BZZZTT!!1! 12663 * 12664 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 12665 * 12666 * @param feedbackConstant One of the constants defined in 12667 * {@link HapticFeedbackConstants} 12668 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 12669 */ 12670 public boolean performHapticFeedback(int feedbackConstant, int flags) { 12671 if (mAttachInfo == null) { 12672 return false; 12673 } 12674 //noinspection SimplifiableIfStatement 12675 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 12676 && !isHapticFeedbackEnabled()) { 12677 return false; 12678 } 12679 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 12680 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 12681 } 12682 12683 /** 12684 * Request that the visibility of the status bar be changed. 12685 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 12686 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 12687 * 12688 * This value will be re-applied immediately, even if the flags have not changed, so a view may 12689 * easily reassert a particular SystemUiVisibility condition even if the system UI itself has 12690 * since countermanded the original request. 12691 */ 12692 public void setSystemUiVisibility(int visibility) { 12693 mSystemUiVisibility = visibility; 12694 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12695 mParent.recomputeViewAttributes(this); 12696 } 12697 } 12698 12699 /** 12700 * Returns the status bar visibility that this view has requested. 12701 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 12702 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 12703 */ 12704 public int getSystemUiVisibility() { 12705 return mSystemUiVisibility; 12706 } 12707 12708 /** 12709 * Set a listener to receive callbacks when the visibility of the system bar changes. 12710 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 12711 */ 12712 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 12713 mOnSystemUiVisibilityChangeListener = l; 12714 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 12715 mParent.recomputeViewAttributes(this); 12716 } 12717 } 12718 12719 /** 12720 */ 12721 public void dispatchSystemUiVisibilityChanged(int visibility) { 12722 if (mOnSystemUiVisibilityChangeListener != null) { 12723 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 12724 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 12725 } 12726 } 12727 12728 /** 12729 * Creates an image that the system displays during the drag and drop 12730 * operation. This is called a "drag shadow". The default implementation 12731 * for a DragShadowBuilder based on a View returns an image that has exactly the same 12732 * appearance as the given View. The default also positions the center of the drag shadow 12733 * directly under the touch point. If no View is provided (the constructor with no parameters 12734 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 12735 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 12736 * default is an invisible drag shadow. 12737 * <p> 12738 * You are not required to use the View you provide to the constructor as the basis of the 12739 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 12740 * anything you want as the drag shadow. 12741 * </p> 12742 * <p> 12743 * You pass a DragShadowBuilder object to the system when you start the drag. The system 12744 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 12745 * size and position of the drag shadow. It uses this data to construct a 12746 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 12747 * so that your application can draw the shadow image in the Canvas. 12748 * </p> 12749 */ 12750 public static class DragShadowBuilder { 12751 private final WeakReference<View> mView; 12752 12753 /** 12754 * Constructs a shadow image builder based on a View. By default, the resulting drag 12755 * shadow will have the same appearance and dimensions as the View, with the touch point 12756 * over the center of the View. 12757 * @param view A View. Any View in scope can be used. 12758 */ 12759 public DragShadowBuilder(View view) { 12760 mView = new WeakReference<View>(view); 12761 } 12762 12763 /** 12764 * Construct a shadow builder object with no associated View. This 12765 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 12766 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 12767 * to supply the drag shadow's dimensions and appearance without 12768 * reference to any View object. If they are not overridden, then the result is an 12769 * invisible drag shadow. 12770 */ 12771 public DragShadowBuilder() { 12772 mView = new WeakReference<View>(null); 12773 } 12774 12775 /** 12776 * Returns the View object that had been passed to the 12777 * {@link #View.DragShadowBuilder(View)} 12778 * constructor. If that View parameter was {@code null} or if the 12779 * {@link #View.DragShadowBuilder()} 12780 * constructor was used to instantiate the builder object, this method will return 12781 * null. 12782 * 12783 * @return The View object associate with this builder object. 12784 */ 12785 @SuppressWarnings({"JavadocReference"}) 12786 final public View getView() { 12787 return mView.get(); 12788 } 12789 12790 /** 12791 * Provides the metrics for the shadow image. These include the dimensions of 12792 * the shadow image, and the point within that shadow that should 12793 * be centered under the touch location while dragging. 12794 * <p> 12795 * The default implementation sets the dimensions of the shadow to be the 12796 * same as the dimensions of the View itself and centers the shadow under 12797 * the touch point. 12798 * </p> 12799 * 12800 * @param shadowSize A {@link android.graphics.Point} containing the width and height 12801 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 12802 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 12803 * image. 12804 * 12805 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 12806 * shadow image that should be underneath the touch point during the drag and drop 12807 * operation. Your application must set {@link android.graphics.Point#x} to the 12808 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 12809 */ 12810 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 12811 final View view = mView.get(); 12812 if (view != null) { 12813 shadowSize.set(view.getWidth(), view.getHeight()); 12814 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 12815 } else { 12816 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 12817 } 12818 } 12819 12820 /** 12821 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 12822 * based on the dimensions it received from the 12823 * {@link #onProvideShadowMetrics(Point, Point)} callback. 12824 * 12825 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 12826 */ 12827 public void onDrawShadow(Canvas canvas) { 12828 final View view = mView.get(); 12829 if (view != null) { 12830 view.draw(canvas); 12831 } else { 12832 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 12833 } 12834 } 12835 } 12836 12837 /** 12838 * Starts a drag and drop operation. When your application calls this method, it passes a 12839 * {@link android.view.View.DragShadowBuilder} object to the system. The 12840 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 12841 * to get metrics for the drag shadow, and then calls the object's 12842 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 12843 * <p> 12844 * Once the system has the drag shadow, it begins the drag and drop operation by sending 12845 * drag events to all the View objects in your application that are currently visible. It does 12846 * this either by calling the View object's drag listener (an implementation of 12847 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 12848 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 12849 * Both are passed a {@link android.view.DragEvent} object that has a 12850 * {@link android.view.DragEvent#getAction()} value of 12851 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 12852 * </p> 12853 * <p> 12854 * Your application can invoke startDrag() on any attached View object. The View object does not 12855 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 12856 * be related to the View the user selected for dragging. 12857 * </p> 12858 * @param data A {@link android.content.ClipData} object pointing to the data to be 12859 * transferred by the drag and drop operation. 12860 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 12861 * drag shadow. 12862 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 12863 * drop operation. This Object is put into every DragEvent object sent by the system during the 12864 * current drag. 12865 * <p> 12866 * myLocalState is a lightweight mechanism for the sending information from the dragged View 12867 * to the target Views. For example, it can contain flags that differentiate between a 12868 * a copy operation and a move operation. 12869 * </p> 12870 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 12871 * so the parameter should be set to 0. 12872 * @return {@code true} if the method completes successfully, or 12873 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 12874 * do a drag, and so no drag operation is in progress. 12875 */ 12876 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 12877 Object myLocalState, int flags) { 12878 if (ViewDebug.DEBUG_DRAG) { 12879 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 12880 } 12881 boolean okay = false; 12882 12883 Point shadowSize = new Point(); 12884 Point shadowTouchPoint = new Point(); 12885 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 12886 12887 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 12888 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 12889 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 12890 } 12891 12892 if (ViewDebug.DEBUG_DRAG) { 12893 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 12894 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 12895 } 12896 Surface surface = new Surface(); 12897 try { 12898 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 12899 flags, shadowSize.x, shadowSize.y, surface); 12900 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 12901 + " surface=" + surface); 12902 if (token != null) { 12903 Canvas canvas = surface.lockCanvas(null); 12904 try { 12905 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 12906 shadowBuilder.onDrawShadow(canvas); 12907 } finally { 12908 surface.unlockCanvasAndPost(canvas); 12909 } 12910 12911 final ViewRootImpl root = getViewRootImpl(); 12912 12913 // Cache the local state object for delivery with DragEvents 12914 root.setLocalDragState(myLocalState); 12915 12916 // repurpose 'shadowSize' for the last touch point 12917 root.getLastTouchPoint(shadowSize); 12918 12919 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 12920 shadowSize.x, shadowSize.y, 12921 shadowTouchPoint.x, shadowTouchPoint.y, data); 12922 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 12923 } 12924 } catch (Exception e) { 12925 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 12926 surface.destroy(); 12927 } 12928 12929 return okay; 12930 } 12931 12932 /** 12933 * Handles drag events sent by the system following a call to 12934 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 12935 *<p> 12936 * When the system calls this method, it passes a 12937 * {@link android.view.DragEvent} object. A call to 12938 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 12939 * in DragEvent. The method uses these to determine what is happening in the drag and drop 12940 * operation. 12941 * @param event The {@link android.view.DragEvent} sent by the system. 12942 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 12943 * in DragEvent, indicating the type of drag event represented by this object. 12944 * @return {@code true} if the method was successful, otherwise {@code false}. 12945 * <p> 12946 * The method should return {@code true} in response to an action type of 12947 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 12948 * operation. 12949 * </p> 12950 * <p> 12951 * The method should also return {@code true} in response to an action type of 12952 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 12953 * {@code false} if it didn't. 12954 * </p> 12955 */ 12956 public boolean onDragEvent(DragEvent event) { 12957 return false; 12958 } 12959 12960 /** 12961 * Detects if this View is enabled and has a drag event listener. 12962 * If both are true, then it calls the drag event listener with the 12963 * {@link android.view.DragEvent} it received. If the drag event listener returns 12964 * {@code true}, then dispatchDragEvent() returns {@code true}. 12965 * <p> 12966 * For all other cases, the method calls the 12967 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 12968 * method and returns its result. 12969 * </p> 12970 * <p> 12971 * This ensures that a drag event is always consumed, even if the View does not have a drag 12972 * event listener. However, if the View has a listener and the listener returns true, then 12973 * onDragEvent() is not called. 12974 * </p> 12975 */ 12976 public boolean dispatchDragEvent(DragEvent event) { 12977 //noinspection SimplifiableIfStatement 12978 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 12979 && mOnDragListener.onDrag(this, event)) { 12980 return true; 12981 } 12982 return onDragEvent(event); 12983 } 12984 12985 boolean canAcceptDrag() { 12986 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 12987 } 12988 12989 /** 12990 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 12991 * it is ever exposed at all. 12992 * @hide 12993 */ 12994 public void onCloseSystemDialogs(String reason) { 12995 } 12996 12997 /** 12998 * Given a Drawable whose bounds have been set to draw into this view, 12999 * update a Region being computed for 13000 * {@link #gatherTransparentRegion(android.graphics.Region)} so 13001 * that any non-transparent parts of the Drawable are removed from the 13002 * given transparent region. 13003 * 13004 * @param dr The Drawable whose transparency is to be applied to the region. 13005 * @param region A Region holding the current transparency information, 13006 * where any parts of the region that are set are considered to be 13007 * transparent. On return, this region will be modified to have the 13008 * transparency information reduced by the corresponding parts of the 13009 * Drawable that are not transparent. 13010 * {@hide} 13011 */ 13012 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 13013 if (DBG) { 13014 Log.i("View", "Getting transparent region for: " + this); 13015 } 13016 final Region r = dr.getTransparentRegion(); 13017 final Rect db = dr.getBounds(); 13018 final AttachInfo attachInfo = mAttachInfo; 13019 if (r != null && attachInfo != null) { 13020 final int w = getRight()-getLeft(); 13021 final int h = getBottom()-getTop(); 13022 if (db.left > 0) { 13023 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 13024 r.op(0, 0, db.left, h, Region.Op.UNION); 13025 } 13026 if (db.right < w) { 13027 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 13028 r.op(db.right, 0, w, h, Region.Op.UNION); 13029 } 13030 if (db.top > 0) { 13031 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 13032 r.op(0, 0, w, db.top, Region.Op.UNION); 13033 } 13034 if (db.bottom < h) { 13035 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 13036 r.op(0, db.bottom, w, h, Region.Op.UNION); 13037 } 13038 final int[] location = attachInfo.mTransparentLocation; 13039 getLocationInWindow(location); 13040 r.translate(location[0], location[1]); 13041 region.op(r, Region.Op.INTERSECT); 13042 } else { 13043 region.op(db, Region.Op.DIFFERENCE); 13044 } 13045 } 13046 13047 private void checkForLongClick(int delayOffset) { 13048 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 13049 mHasPerformedLongPress = false; 13050 13051 if (mPendingCheckForLongPress == null) { 13052 mPendingCheckForLongPress = new CheckForLongPress(); 13053 } 13054 mPendingCheckForLongPress.rememberWindowAttachCount(); 13055 postDelayed(mPendingCheckForLongPress, 13056 ViewConfiguration.getLongPressTimeout() - delayOffset); 13057 } 13058 } 13059 13060 /** 13061 * Inflate a view from an XML resource. This convenience method wraps the {@link 13062 * LayoutInflater} class, which provides a full range of options for view inflation. 13063 * 13064 * @param context The Context object for your activity or application. 13065 * @param resource The resource ID to inflate 13066 * @param root A view group that will be the parent. Used to properly inflate the 13067 * layout_* parameters. 13068 * @see LayoutInflater 13069 */ 13070 public static View inflate(Context context, int resource, ViewGroup root) { 13071 LayoutInflater factory = LayoutInflater.from(context); 13072 return factory.inflate(resource, root); 13073 } 13074 13075 /** 13076 * Scroll the view with standard behavior for scrolling beyond the normal 13077 * content boundaries. Views that call this method should override 13078 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 13079 * results of an over-scroll operation. 13080 * 13081 * Views can use this method to handle any touch or fling-based scrolling. 13082 * 13083 * @param deltaX Change in X in pixels 13084 * @param deltaY Change in Y in pixels 13085 * @param scrollX Current X scroll value in pixels before applying deltaX 13086 * @param scrollY Current Y scroll value in pixels before applying deltaY 13087 * @param scrollRangeX Maximum content scroll range along the X axis 13088 * @param scrollRangeY Maximum content scroll range along the Y axis 13089 * @param maxOverScrollX Number of pixels to overscroll by in either direction 13090 * along the X axis. 13091 * @param maxOverScrollY Number of pixels to overscroll by in either direction 13092 * along the Y axis. 13093 * @param isTouchEvent true if this scroll operation is the result of a touch event. 13094 * @return true if scrolling was clamped to an over-scroll boundary along either 13095 * axis, false otherwise. 13096 */ 13097 @SuppressWarnings({"UnusedParameters"}) 13098 protected boolean overScrollBy(int deltaX, int deltaY, 13099 int scrollX, int scrollY, 13100 int scrollRangeX, int scrollRangeY, 13101 int maxOverScrollX, int maxOverScrollY, 13102 boolean isTouchEvent) { 13103 final int overScrollMode = mOverScrollMode; 13104 final boolean canScrollHorizontal = 13105 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 13106 final boolean canScrollVertical = 13107 computeVerticalScrollRange() > computeVerticalScrollExtent(); 13108 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 13109 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 13110 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 13111 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 13112 13113 int newScrollX = scrollX + deltaX; 13114 if (!overScrollHorizontal) { 13115 maxOverScrollX = 0; 13116 } 13117 13118 int newScrollY = scrollY + deltaY; 13119 if (!overScrollVertical) { 13120 maxOverScrollY = 0; 13121 } 13122 13123 // Clamp values if at the limits and record 13124 final int left = -maxOverScrollX; 13125 final int right = maxOverScrollX + scrollRangeX; 13126 final int top = -maxOverScrollY; 13127 final int bottom = maxOverScrollY + scrollRangeY; 13128 13129 boolean clampedX = false; 13130 if (newScrollX > right) { 13131 newScrollX = right; 13132 clampedX = true; 13133 } else if (newScrollX < left) { 13134 newScrollX = left; 13135 clampedX = true; 13136 } 13137 13138 boolean clampedY = false; 13139 if (newScrollY > bottom) { 13140 newScrollY = bottom; 13141 clampedY = true; 13142 } else if (newScrollY < top) { 13143 newScrollY = top; 13144 clampedY = true; 13145 } 13146 13147 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 13148 13149 return clampedX || clampedY; 13150 } 13151 13152 /** 13153 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 13154 * respond to the results of an over-scroll operation. 13155 * 13156 * @param scrollX New X scroll value in pixels 13157 * @param scrollY New Y scroll value in pixels 13158 * @param clampedX True if scrollX was clamped to an over-scroll boundary 13159 * @param clampedY True if scrollY was clamped to an over-scroll boundary 13160 */ 13161 protected void onOverScrolled(int scrollX, int scrollY, 13162 boolean clampedX, boolean clampedY) { 13163 // Intentionally empty. 13164 } 13165 13166 /** 13167 * Returns the over-scroll mode for this view. The result will be 13168 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13169 * (allow over-scrolling only if the view content is larger than the container), 13170 * or {@link #OVER_SCROLL_NEVER}. 13171 * 13172 * @return This view's over-scroll mode. 13173 */ 13174 public int getOverScrollMode() { 13175 return mOverScrollMode; 13176 } 13177 13178 /** 13179 * Set the over-scroll mode for this view. Valid over-scroll modes are 13180 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 13181 * (allow over-scrolling only if the view content is larger than the container), 13182 * or {@link #OVER_SCROLL_NEVER}. 13183 * 13184 * Setting the over-scroll mode of a view will have an effect only if the 13185 * view is capable of scrolling. 13186 * 13187 * @param overScrollMode The new over-scroll mode for this view. 13188 */ 13189 public void setOverScrollMode(int overScrollMode) { 13190 if (overScrollMode != OVER_SCROLL_ALWAYS && 13191 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 13192 overScrollMode != OVER_SCROLL_NEVER) { 13193 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 13194 } 13195 mOverScrollMode = overScrollMode; 13196 } 13197 13198 /** 13199 * Gets a scale factor that determines the distance the view should scroll 13200 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 13201 * @return The vertical scroll scale factor. 13202 * @hide 13203 */ 13204 protected float getVerticalScrollFactor() { 13205 if (mVerticalScrollFactor == 0) { 13206 TypedValue outValue = new TypedValue(); 13207 if (!mContext.getTheme().resolveAttribute( 13208 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 13209 throw new IllegalStateException( 13210 "Expected theme to define listPreferredItemHeight."); 13211 } 13212 mVerticalScrollFactor = outValue.getDimension( 13213 mContext.getResources().getDisplayMetrics()); 13214 } 13215 return mVerticalScrollFactor; 13216 } 13217 13218 /** 13219 * Gets a scale factor that determines the distance the view should scroll 13220 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 13221 * @return The horizontal scroll scale factor. 13222 * @hide 13223 */ 13224 protected float getHorizontalScrollFactor() { 13225 // TODO: Should use something else. 13226 return getVerticalScrollFactor(); 13227 } 13228 13229 /** 13230 * Return the value specifying the text direction or policy that was set with 13231 * {@link #setTextDirection(int)}. 13232 * 13233 * @return the defined text direction. It can be one of: 13234 * 13235 * {@link #TEXT_DIRECTION_INHERIT}, 13236 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13237 * {@link #TEXT_DIRECTION_ANY_RTL}, 13238 * {@link #TEXT_DIRECTION_CHAR_COUNT}, 13239 * {@link #TEXT_DIRECTION_LTR}, 13240 * {@link #TEXT_DIRECTION_RTL}, 13241 * 13242 * @hide 13243 */ 13244 public int getTextDirection() { 13245 return mTextDirection; 13246 } 13247 13248 /** 13249 * Set the text direction. 13250 * 13251 * @param textDirection the direction to set. Should be one of: 13252 * 13253 * {@link #TEXT_DIRECTION_INHERIT}, 13254 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13255 * {@link #TEXT_DIRECTION_ANY_RTL}, 13256 * {@link #TEXT_DIRECTION_CHAR_COUNT}, 13257 * {@link #TEXT_DIRECTION_LTR}, 13258 * {@link #TEXT_DIRECTION_RTL}, 13259 * 13260 * @hide 13261 */ 13262 public void setTextDirection(int textDirection) { 13263 if (textDirection != mTextDirection) { 13264 mTextDirection = textDirection; 13265 resetResolvedTextDirection(); 13266 requestLayout(); 13267 } 13268 } 13269 13270 /** 13271 * Return the resolved text direction. 13272 * 13273 * @return the resolved text direction. Return one of: 13274 * 13275 * {@link #TEXT_DIRECTION_FIRST_STRONG} 13276 * {@link #TEXT_DIRECTION_ANY_RTL}, 13277 * {@link #TEXT_DIRECTION_CHAR_COUNT}, 13278 * {@link #TEXT_DIRECTION_LTR}, 13279 * {@link #TEXT_DIRECTION_RTL}, 13280 * 13281 * @hide 13282 */ 13283 public int getResolvedTextDirection() { 13284 if (mResolvedTextDirection == TEXT_DIRECTION_INHERIT) { 13285 resolveTextDirection(); 13286 } 13287 return mResolvedTextDirection; 13288 } 13289 13290 /** 13291 * Resolve the text direction. 13292 */ 13293 protected void resolveTextDirection() { 13294 if (mTextDirection != TEXT_DIRECTION_INHERIT) { 13295 mResolvedTextDirection = mTextDirection; 13296 return; 13297 } 13298 if (mParent != null && mParent instanceof ViewGroup) { 13299 mResolvedTextDirection = ((ViewGroup) mParent).getResolvedTextDirection(); 13300 return; 13301 } 13302 mResolvedTextDirection = TEXT_DIRECTION_FIRST_STRONG; 13303 } 13304 13305 /** 13306 * Reset resolved text direction. Will be resolved during a call to getResolvedTextDirection(). 13307 */ 13308 protected void resetResolvedTextDirection() { 13309 mResolvedTextDirection = TEXT_DIRECTION_INHERIT; 13310 } 13311 13312 // 13313 // Properties 13314 // 13315 /** 13316 * A Property wrapper around the <code>alpha</code> functionality handled by the 13317 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 13318 */ 13319 public static Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 13320 @Override 13321 public void setValue(View object, float value) { 13322 object.setAlpha(value); 13323 } 13324 13325 @Override 13326 public Float get(View object) { 13327 return object.getAlpha(); 13328 } 13329 }; 13330 13331 /** 13332 * A Property wrapper around the <code>translationX</code> functionality handled by the 13333 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 13334 */ 13335 public static Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 13336 @Override 13337 public void setValue(View object, float value) { 13338 object.setTranslationX(value); 13339 } 13340 13341 @Override 13342 public Float get(View object) { 13343 return object.getTranslationX(); 13344 } 13345 }; 13346 13347 /** 13348 * A Property wrapper around the <code>translationY</code> functionality handled by the 13349 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 13350 */ 13351 public static Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 13352 @Override 13353 public void setValue(View object, float value) { 13354 object.setTranslationY(value); 13355 } 13356 13357 @Override 13358 public Float get(View object) { 13359 return object.getTranslationY(); 13360 } 13361 }; 13362 13363 /** 13364 * A Property wrapper around the <code>x</code> functionality handled by the 13365 * {@link View#setX(float)} and {@link View#getX()} methods. 13366 */ 13367 public static Property<View, Float> X = new FloatProperty<View>("x") { 13368 @Override 13369 public void setValue(View object, float value) { 13370 object.setX(value); 13371 } 13372 13373 @Override 13374 public Float get(View object) { 13375 return object.getX(); 13376 } 13377 }; 13378 13379 /** 13380 * A Property wrapper around the <code>y</code> functionality handled by the 13381 * {@link View#setY(float)} and {@link View#getY()} methods. 13382 */ 13383 public static Property<View, Float> Y = new FloatProperty<View>("y") { 13384 @Override 13385 public void setValue(View object, float value) { 13386 object.setY(value); 13387 } 13388 13389 @Override 13390 public Float get(View object) { 13391 return object.getY(); 13392 } 13393 }; 13394 13395 /** 13396 * A Property wrapper around the <code>rotation</code> functionality handled by the 13397 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 13398 */ 13399 public static Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 13400 @Override 13401 public void setValue(View object, float value) { 13402 object.setRotation(value); 13403 } 13404 13405 @Override 13406 public Float get(View object) { 13407 return object.getRotation(); 13408 } 13409 }; 13410 13411 /** 13412 * A Property wrapper around the <code>rotationX</code> functionality handled by the 13413 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 13414 */ 13415 public static Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 13416 @Override 13417 public void setValue(View object, float value) { 13418 object.setRotationX(value); 13419 } 13420 13421 @Override 13422 public Float get(View object) { 13423 return object.getRotationX(); 13424 } 13425 }; 13426 13427 /** 13428 * A Property wrapper around the <code>rotationY</code> functionality handled by the 13429 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 13430 */ 13431 public static Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 13432 @Override 13433 public void setValue(View object, float value) { 13434 object.setRotationY(value); 13435 } 13436 13437 @Override 13438 public Float get(View object) { 13439 return object.getRotationY(); 13440 } 13441 }; 13442 13443 /** 13444 * A Property wrapper around the <code>scaleX</code> functionality handled by the 13445 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 13446 */ 13447 public static Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 13448 @Override 13449 public void setValue(View object, float value) { 13450 object.setScaleX(value); 13451 } 13452 13453 @Override 13454 public Float get(View object) { 13455 return object.getScaleX(); 13456 } 13457 }; 13458 13459 /** 13460 * A Property wrapper around the <code>scaleY</code> functionality handled by the 13461 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 13462 */ 13463 public static Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 13464 @Override 13465 public void setValue(View object, float value) { 13466 object.setScaleY(value); 13467 } 13468 13469 @Override 13470 public Float get(View object) { 13471 return object.getScaleY(); 13472 } 13473 }; 13474 13475 /** 13476 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 13477 * Each MeasureSpec represents a requirement for either the width or the height. 13478 * A MeasureSpec is comprised of a size and a mode. There are three possible 13479 * modes: 13480 * <dl> 13481 * <dt>UNSPECIFIED</dt> 13482 * <dd> 13483 * The parent has not imposed any constraint on the child. It can be whatever size 13484 * it wants. 13485 * </dd> 13486 * 13487 * <dt>EXACTLY</dt> 13488 * <dd> 13489 * The parent has determined an exact size for the child. The child is going to be 13490 * given those bounds regardless of how big it wants to be. 13491 * </dd> 13492 * 13493 * <dt>AT_MOST</dt> 13494 * <dd> 13495 * The child can be as large as it wants up to the specified size. 13496 * </dd> 13497 * </dl> 13498 * 13499 * MeasureSpecs are implemented as ints to reduce object allocation. This class 13500 * is provided to pack and unpack the <size, mode> tuple into the int. 13501 */ 13502 public static class MeasureSpec { 13503 private static final int MODE_SHIFT = 30; 13504 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 13505 13506 /** 13507 * Measure specification mode: The parent has not imposed any constraint 13508 * on the child. It can be whatever size it wants. 13509 */ 13510 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 13511 13512 /** 13513 * Measure specification mode: The parent has determined an exact size 13514 * for the child. The child is going to be given those bounds regardless 13515 * of how big it wants to be. 13516 */ 13517 public static final int EXACTLY = 1 << MODE_SHIFT; 13518 13519 /** 13520 * Measure specification mode: The child can be as large as it wants up 13521 * to the specified size. 13522 */ 13523 public static final int AT_MOST = 2 << MODE_SHIFT; 13524 13525 /** 13526 * Creates a measure specification based on the supplied size and mode. 13527 * 13528 * The mode must always be one of the following: 13529 * <ul> 13530 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 13531 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 13532 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 13533 * </ul> 13534 * 13535 * @param size the size of the measure specification 13536 * @param mode the mode of the measure specification 13537 * @return the measure specification based on size and mode 13538 */ 13539 public static int makeMeasureSpec(int size, int mode) { 13540 return size + mode; 13541 } 13542 13543 /** 13544 * Extracts the mode from the supplied measure specification. 13545 * 13546 * @param measureSpec the measure specification to extract the mode from 13547 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 13548 * {@link android.view.View.MeasureSpec#AT_MOST} or 13549 * {@link android.view.View.MeasureSpec#EXACTLY} 13550 */ 13551 public static int getMode(int measureSpec) { 13552 return (measureSpec & MODE_MASK); 13553 } 13554 13555 /** 13556 * Extracts the size from the supplied measure specification. 13557 * 13558 * @param measureSpec the measure specification to extract the size from 13559 * @return the size in pixels defined in the supplied measure specification 13560 */ 13561 public static int getSize(int measureSpec) { 13562 return (measureSpec & ~MODE_MASK); 13563 } 13564 13565 /** 13566 * Returns a String representation of the specified measure 13567 * specification. 13568 * 13569 * @param measureSpec the measure specification to convert to a String 13570 * @return a String with the following format: "MeasureSpec: MODE SIZE" 13571 */ 13572 public static String toString(int measureSpec) { 13573 int mode = getMode(measureSpec); 13574 int size = getSize(measureSpec); 13575 13576 StringBuilder sb = new StringBuilder("MeasureSpec: "); 13577 13578 if (mode == UNSPECIFIED) 13579 sb.append("UNSPECIFIED "); 13580 else if (mode == EXACTLY) 13581 sb.append("EXACTLY "); 13582 else if (mode == AT_MOST) 13583 sb.append("AT_MOST "); 13584 else 13585 sb.append(mode).append(" "); 13586 13587 sb.append(size); 13588 return sb.toString(); 13589 } 13590 } 13591 13592 class CheckForLongPress implements Runnable { 13593 13594 private int mOriginalWindowAttachCount; 13595 13596 public void run() { 13597 if (isPressed() && (mParent != null) 13598 && mOriginalWindowAttachCount == mWindowAttachCount) { 13599 if (performLongClick()) { 13600 mHasPerformedLongPress = true; 13601 } 13602 } 13603 } 13604 13605 public void rememberWindowAttachCount() { 13606 mOriginalWindowAttachCount = mWindowAttachCount; 13607 } 13608 } 13609 13610 private final class CheckForTap implements Runnable { 13611 public void run() { 13612 mPrivateFlags &= ~PREPRESSED; 13613 mPrivateFlags |= PRESSED; 13614 refreshDrawableState(); 13615 checkForLongClick(ViewConfiguration.getTapTimeout()); 13616 } 13617 } 13618 13619 private final class PerformClick implements Runnable { 13620 public void run() { 13621 performClick(); 13622 } 13623 } 13624 13625 /** @hide */ 13626 public void hackTurnOffWindowResizeAnim(boolean off) { 13627 mAttachInfo.mTurnOffWindowResizeAnim = off; 13628 } 13629 13630 /** 13631 * This method returns a ViewPropertyAnimator object, which can be used to animate 13632 * specific properties on this View. 13633 * 13634 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 13635 */ 13636 public ViewPropertyAnimator animate() { 13637 if (mAnimator == null) { 13638 mAnimator = new ViewPropertyAnimator(this); 13639 } 13640 return mAnimator; 13641 } 13642 13643 /** 13644 * Interface definition for a callback to be invoked when a key event is 13645 * dispatched to this view. The callback will be invoked before the key 13646 * event is given to the view. 13647 */ 13648 public interface OnKeyListener { 13649 /** 13650 * Called when a key is dispatched to a view. This allows listeners to 13651 * get a chance to respond before the target view. 13652 * 13653 * @param v The view the key has been dispatched to. 13654 * @param keyCode The code for the physical key that was pressed 13655 * @param event The KeyEvent object containing full information about 13656 * the event. 13657 * @return True if the listener has consumed the event, false otherwise. 13658 */ 13659 boolean onKey(View v, int keyCode, KeyEvent event); 13660 } 13661 13662 /** 13663 * Interface definition for a callback to be invoked when a touch event is 13664 * dispatched to this view. The callback will be invoked before the touch 13665 * event is given to the view. 13666 */ 13667 public interface OnTouchListener { 13668 /** 13669 * Called when a touch event is dispatched to a view. This allows listeners to 13670 * get a chance to respond before the target view. 13671 * 13672 * @param v The view the touch event has been dispatched to. 13673 * @param event The MotionEvent object containing full information about 13674 * the event. 13675 * @return True if the listener has consumed the event, false otherwise. 13676 */ 13677 boolean onTouch(View v, MotionEvent event); 13678 } 13679 13680 /** 13681 * Interface definition for a callback to be invoked when a hover event is 13682 * dispatched to this view. The callback will be invoked before the hover 13683 * event is given to the view. 13684 */ 13685 public interface OnHoverListener { 13686 /** 13687 * Called when a hover event is dispatched to a view. This allows listeners to 13688 * get a chance to respond before the target view. 13689 * 13690 * @param v The view the hover event has been dispatched to. 13691 * @param event The MotionEvent object containing full information about 13692 * the event. 13693 * @return True if the listener has consumed the event, false otherwise. 13694 */ 13695 boolean onHover(View v, MotionEvent event); 13696 } 13697 13698 /** 13699 * Interface definition for a callback to be invoked when a generic motion event is 13700 * dispatched to this view. The callback will be invoked before the generic motion 13701 * event is given to the view. 13702 */ 13703 public interface OnGenericMotionListener { 13704 /** 13705 * Called when a generic motion event is dispatched to a view. This allows listeners to 13706 * get a chance to respond before the target view. 13707 * 13708 * @param v The view the generic motion event has been dispatched to. 13709 * @param event The MotionEvent object containing full information about 13710 * the event. 13711 * @return True if the listener has consumed the event, false otherwise. 13712 */ 13713 boolean onGenericMotion(View v, MotionEvent event); 13714 } 13715 13716 /** 13717 * Interface definition for a callback to be invoked when a view has been clicked and held. 13718 */ 13719 public interface OnLongClickListener { 13720 /** 13721 * Called when a view has been clicked and held. 13722 * 13723 * @param v The view that was clicked and held. 13724 * 13725 * @return true if the callback consumed the long click, false otherwise. 13726 */ 13727 boolean onLongClick(View v); 13728 } 13729 13730 /** 13731 * Interface definition for a callback to be invoked when a drag is being dispatched 13732 * to this view. The callback will be invoked before the hosting view's own 13733 * onDrag(event) method. If the listener wants to fall back to the hosting view's 13734 * onDrag(event) behavior, it should return 'false' from this callback. 13735 */ 13736 public interface OnDragListener { 13737 /** 13738 * Called when a drag event is dispatched to a view. This allows listeners 13739 * to get a chance to override base View behavior. 13740 * 13741 * @param v The View that received the drag event. 13742 * @param event The {@link android.view.DragEvent} object for the drag event. 13743 * @return {@code true} if the drag event was handled successfully, or {@code false} 13744 * if the drag event was not handled. Note that {@code false} will trigger the View 13745 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 13746 */ 13747 boolean onDrag(View v, DragEvent event); 13748 } 13749 13750 /** 13751 * Interface definition for a callback to be invoked when the focus state of 13752 * a view changed. 13753 */ 13754 public interface OnFocusChangeListener { 13755 /** 13756 * Called when the focus state of a view has changed. 13757 * 13758 * @param v The view whose state has changed. 13759 * @param hasFocus The new focus state of v. 13760 */ 13761 void onFocusChange(View v, boolean hasFocus); 13762 } 13763 13764 /** 13765 * Interface definition for a callback to be invoked when a view is clicked. 13766 */ 13767 public interface OnClickListener { 13768 /** 13769 * Called when a view has been clicked. 13770 * 13771 * @param v The view that was clicked. 13772 */ 13773 void onClick(View v); 13774 } 13775 13776 /** 13777 * Interface definition for a callback to be invoked when the context menu 13778 * for this view is being built. 13779 */ 13780 public interface OnCreateContextMenuListener { 13781 /** 13782 * Called when the context menu for this view is being built. It is not 13783 * safe to hold onto the menu after this method returns. 13784 * 13785 * @param menu The context menu that is being built 13786 * @param v The view for which the context menu is being built 13787 * @param menuInfo Extra information about the item for which the 13788 * context menu should be shown. This information will vary 13789 * depending on the class of v. 13790 */ 13791 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 13792 } 13793 13794 /** 13795 * Interface definition for a callback to be invoked when the status bar changes 13796 * visibility. 13797 * 13798 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 13799 */ 13800 public interface OnSystemUiVisibilityChangeListener { 13801 /** 13802 * Called when the status bar changes visibility because of a call to 13803 * {@link View#setSystemUiVisibility(int)}. 13804 * 13805 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 13806 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. 13807 */ 13808 public void onSystemUiVisibilityChange(int visibility); 13809 } 13810 13811 /** 13812 * Interface definition for a callback to be invoked when this view is attached 13813 * or detached from its window. 13814 */ 13815 public interface OnAttachStateChangeListener { 13816 /** 13817 * Called when the view is attached to a window. 13818 * @param v The view that was attached 13819 */ 13820 public void onViewAttachedToWindow(View v); 13821 /** 13822 * Called when the view is detached from a window. 13823 * @param v The view that was detached 13824 */ 13825 public void onViewDetachedFromWindow(View v); 13826 } 13827 13828 private final class UnsetPressedState implements Runnable { 13829 public void run() { 13830 setPressed(false); 13831 } 13832 } 13833 13834 /** 13835 * Base class for derived classes that want to save and restore their own 13836 * state in {@link android.view.View#onSaveInstanceState()}. 13837 */ 13838 public static class BaseSavedState extends AbsSavedState { 13839 /** 13840 * Constructor used when reading from a parcel. Reads the state of the superclass. 13841 * 13842 * @param source 13843 */ 13844 public BaseSavedState(Parcel source) { 13845 super(source); 13846 } 13847 13848 /** 13849 * Constructor called by derived classes when creating their SavedState objects 13850 * 13851 * @param superState The state of the superclass of this view 13852 */ 13853 public BaseSavedState(Parcelable superState) { 13854 super(superState); 13855 } 13856 13857 public static final Parcelable.Creator<BaseSavedState> CREATOR = 13858 new Parcelable.Creator<BaseSavedState>() { 13859 public BaseSavedState createFromParcel(Parcel in) { 13860 return new BaseSavedState(in); 13861 } 13862 13863 public BaseSavedState[] newArray(int size) { 13864 return new BaseSavedState[size]; 13865 } 13866 }; 13867 } 13868 13869 /** 13870 * A set of information given to a view when it is attached to its parent 13871 * window. 13872 */ 13873 static class AttachInfo { 13874 interface Callbacks { 13875 void playSoundEffect(int effectId); 13876 boolean performHapticFeedback(int effectId, boolean always); 13877 } 13878 13879 /** 13880 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 13881 * to a Handler. This class contains the target (View) to invalidate and 13882 * the coordinates of the dirty rectangle. 13883 * 13884 * For performance purposes, this class also implements a pool of up to 13885 * POOL_LIMIT objects that get reused. This reduces memory allocations 13886 * whenever possible. 13887 */ 13888 static class InvalidateInfo implements Poolable<InvalidateInfo> { 13889 private static final int POOL_LIMIT = 10; 13890 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 13891 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 13892 public InvalidateInfo newInstance() { 13893 return new InvalidateInfo(); 13894 } 13895 13896 public void onAcquired(InvalidateInfo element) { 13897 } 13898 13899 public void onReleased(InvalidateInfo element) { 13900 element.target = null; 13901 } 13902 }, POOL_LIMIT) 13903 ); 13904 13905 private InvalidateInfo mNext; 13906 private boolean mIsPooled; 13907 13908 View target; 13909 13910 int left; 13911 int top; 13912 int right; 13913 int bottom; 13914 13915 public void setNextPoolable(InvalidateInfo element) { 13916 mNext = element; 13917 } 13918 13919 public InvalidateInfo getNextPoolable() { 13920 return mNext; 13921 } 13922 13923 static InvalidateInfo acquire() { 13924 return sPool.acquire(); 13925 } 13926 13927 void release() { 13928 sPool.release(this); 13929 } 13930 13931 public boolean isPooled() { 13932 return mIsPooled; 13933 } 13934 13935 public void setPooled(boolean isPooled) { 13936 mIsPooled = isPooled; 13937 } 13938 } 13939 13940 final IWindowSession mSession; 13941 13942 final IWindow mWindow; 13943 13944 final IBinder mWindowToken; 13945 13946 final Callbacks mRootCallbacks; 13947 13948 HardwareCanvas mHardwareCanvas; 13949 13950 /** 13951 * The top view of the hierarchy. 13952 */ 13953 View mRootView; 13954 13955 IBinder mPanelParentWindowToken; 13956 Surface mSurface; 13957 13958 boolean mHardwareAccelerated; 13959 boolean mHardwareAccelerationRequested; 13960 HardwareRenderer mHardwareRenderer; 13961 13962 /** 13963 * Scale factor used by the compatibility mode 13964 */ 13965 float mApplicationScale; 13966 13967 /** 13968 * Indicates whether the application is in compatibility mode 13969 */ 13970 boolean mScalingRequired; 13971 13972 /** 13973 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 13974 */ 13975 boolean mTurnOffWindowResizeAnim; 13976 13977 /** 13978 * Left position of this view's window 13979 */ 13980 int mWindowLeft; 13981 13982 /** 13983 * Top position of this view's window 13984 */ 13985 int mWindowTop; 13986 13987 /** 13988 * Indicates whether views need to use 32-bit drawing caches 13989 */ 13990 boolean mUse32BitDrawingCache; 13991 13992 /** 13993 * For windows that are full-screen but using insets to layout inside 13994 * of the screen decorations, these are the current insets for the 13995 * content of the window. 13996 */ 13997 final Rect mContentInsets = new Rect(); 13998 13999 /** 14000 * For windows that are full-screen but using insets to layout inside 14001 * of the screen decorations, these are the current insets for the 14002 * actual visible parts of the window. 14003 */ 14004 final Rect mVisibleInsets = new Rect(); 14005 14006 /** 14007 * The internal insets given by this window. This value is 14008 * supplied by the client (through 14009 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 14010 * be given to the window manager when changed to be used in laying 14011 * out windows behind it. 14012 */ 14013 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 14014 = new ViewTreeObserver.InternalInsetsInfo(); 14015 14016 /** 14017 * All views in the window's hierarchy that serve as scroll containers, 14018 * used to determine if the window can be resized or must be panned 14019 * to adjust for a soft input area. 14020 */ 14021 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 14022 14023 final KeyEvent.DispatcherState mKeyDispatchState 14024 = new KeyEvent.DispatcherState(); 14025 14026 /** 14027 * Indicates whether the view's window currently has the focus. 14028 */ 14029 boolean mHasWindowFocus; 14030 14031 /** 14032 * The current visibility of the window. 14033 */ 14034 int mWindowVisibility; 14035 14036 /** 14037 * Indicates the time at which drawing started to occur. 14038 */ 14039 long mDrawingTime; 14040 14041 /** 14042 * Indicates whether or not ignoring the DIRTY_MASK flags. 14043 */ 14044 boolean mIgnoreDirtyState; 14045 14046 /** 14047 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 14048 * to avoid clearing that flag prematurely. 14049 */ 14050 boolean mSetIgnoreDirtyState = false; 14051 14052 /** 14053 * Indicates whether the view's window is currently in touch mode. 14054 */ 14055 boolean mInTouchMode; 14056 14057 /** 14058 * Indicates that ViewAncestor should trigger a global layout change 14059 * the next time it performs a traversal 14060 */ 14061 boolean mRecomputeGlobalAttributes; 14062 14063 /** 14064 * Set during a traveral if any views want to keep the screen on. 14065 */ 14066 boolean mKeepScreenOn; 14067 14068 /** 14069 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 14070 */ 14071 int mSystemUiVisibility; 14072 14073 /** 14074 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 14075 * attached. 14076 */ 14077 boolean mHasSystemUiListeners; 14078 14079 /** 14080 * Set if the visibility of any views has changed. 14081 */ 14082 boolean mViewVisibilityChanged; 14083 14084 /** 14085 * Set to true if a view has been scrolled. 14086 */ 14087 boolean mViewScrollChanged; 14088 14089 /** 14090 * Global to the view hierarchy used as a temporary for dealing with 14091 * x/y points in the transparent region computations. 14092 */ 14093 final int[] mTransparentLocation = new int[2]; 14094 14095 /** 14096 * Global to the view hierarchy used as a temporary for dealing with 14097 * x/y points in the ViewGroup.invalidateChild implementation. 14098 */ 14099 final int[] mInvalidateChildLocation = new int[2]; 14100 14101 14102 /** 14103 * Global to the view hierarchy used as a temporary for dealing with 14104 * x/y location when view is transformed. 14105 */ 14106 final float[] mTmpTransformLocation = new float[2]; 14107 14108 /** 14109 * The view tree observer used to dispatch global events like 14110 * layout, pre-draw, touch mode change, etc. 14111 */ 14112 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 14113 14114 /** 14115 * A Canvas used by the view hierarchy to perform bitmap caching. 14116 */ 14117 Canvas mCanvas; 14118 14119 /** 14120 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 14121 * handler can be used to pump events in the UI events queue. 14122 */ 14123 final Handler mHandler; 14124 14125 /** 14126 * Identifier for messages requesting the view to be invalidated. 14127 * Such messages should be sent to {@link #mHandler}. 14128 */ 14129 static final int INVALIDATE_MSG = 0x1; 14130 14131 /** 14132 * Identifier for messages requesting the view to invalidate a region. 14133 * Such messages should be sent to {@link #mHandler}. 14134 */ 14135 static final int INVALIDATE_RECT_MSG = 0x2; 14136 14137 /** 14138 * Temporary for use in computing invalidate rectangles while 14139 * calling up the hierarchy. 14140 */ 14141 final Rect mTmpInvalRect = new Rect(); 14142 14143 /** 14144 * Temporary for use in computing hit areas with transformed views 14145 */ 14146 final RectF mTmpTransformRect = new RectF(); 14147 14148 /** 14149 * Temporary list for use in collecting focusable descendents of a view. 14150 */ 14151 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 14152 14153 /** 14154 * The id of the window for accessibility purposes. 14155 */ 14156 int mAccessibilityWindowId = View.NO_ID; 14157 14158 /** 14159 * Creates a new set of attachment information with the specified 14160 * events handler and thread. 14161 * 14162 * @param handler the events handler the view must use 14163 */ 14164 AttachInfo(IWindowSession session, IWindow window, 14165 Handler handler, Callbacks effectPlayer) { 14166 mSession = session; 14167 mWindow = window; 14168 mWindowToken = window.asBinder(); 14169 mHandler = handler; 14170 mRootCallbacks = effectPlayer; 14171 } 14172 } 14173 14174 /** 14175 * <p>ScrollabilityCache holds various fields used by a View when scrolling 14176 * is supported. This avoids keeping too many unused fields in most 14177 * instances of View.</p> 14178 */ 14179 private static class ScrollabilityCache implements Runnable { 14180 14181 /** 14182 * Scrollbars are not visible 14183 */ 14184 public static final int OFF = 0; 14185 14186 /** 14187 * Scrollbars are visible 14188 */ 14189 public static final int ON = 1; 14190 14191 /** 14192 * Scrollbars are fading away 14193 */ 14194 public static final int FADING = 2; 14195 14196 public boolean fadeScrollBars; 14197 14198 public int fadingEdgeLength; 14199 public int scrollBarDefaultDelayBeforeFade; 14200 public int scrollBarFadeDuration; 14201 14202 public int scrollBarSize; 14203 public ScrollBarDrawable scrollBar; 14204 public float[] interpolatorValues; 14205 public View host; 14206 14207 public final Paint paint; 14208 public final Matrix matrix; 14209 public Shader shader; 14210 14211 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 14212 14213 private static final float[] OPAQUE = { 255 }; 14214 private static final float[] TRANSPARENT = { 0.0f }; 14215 14216 /** 14217 * When fading should start. This time moves into the future every time 14218 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 14219 */ 14220 public long fadeStartTime; 14221 14222 14223 /** 14224 * The current state of the scrollbars: ON, OFF, or FADING 14225 */ 14226 public int state = OFF; 14227 14228 private int mLastColor; 14229 14230 public ScrollabilityCache(ViewConfiguration configuration, View host) { 14231 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 14232 scrollBarSize = configuration.getScaledScrollBarSize(); 14233 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 14234 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 14235 14236 paint = new Paint(); 14237 matrix = new Matrix(); 14238 // use use a height of 1, and then wack the matrix each time we 14239 // actually use it. 14240 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 14241 14242 paint.setShader(shader); 14243 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 14244 this.host = host; 14245 } 14246 14247 public void setFadeColor(int color) { 14248 if (color != 0 && color != mLastColor) { 14249 mLastColor = color; 14250 color |= 0xFF000000; 14251 14252 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 14253 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 14254 14255 paint.setShader(shader); 14256 // Restore the default transfer mode (src_over) 14257 paint.setXfermode(null); 14258 } 14259 } 14260 14261 public void run() { 14262 long now = AnimationUtils.currentAnimationTimeMillis(); 14263 if (now >= fadeStartTime) { 14264 14265 // the animation fades the scrollbars out by changing 14266 // the opacity (alpha) from fully opaque to fully 14267 // transparent 14268 int nextFrame = (int) now; 14269 int framesCount = 0; 14270 14271 Interpolator interpolator = scrollBarInterpolator; 14272 14273 // Start opaque 14274 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 14275 14276 // End transparent 14277 nextFrame += scrollBarFadeDuration; 14278 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 14279 14280 state = FADING; 14281 14282 // Kick off the fade animation 14283 host.invalidate(true); 14284 } 14285 } 14286 } 14287 14288 /** 14289 * Resuable callback for sending 14290 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 14291 */ 14292 private class SendViewScrolledAccessibilityEvent implements Runnable { 14293 public volatile boolean mIsPending; 14294 14295 public void run() { 14296 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 14297 mIsPending = false; 14298 } 14299 } 14300} 14301